1. A micro-nano satellite solar sail propulsion system unfolding device is characterized by comprising a supporting protection mechanism (1), a sail storage mechanism (2), an unfolding mechanism (3), a pressing mechanism (4) and a limiting locking mechanism (5);

the supporting and protecting mechanism (1) is used for supporting and protecting parts of the unfolding device and comprises a windsurfing board (6) which can be unfolded; the film sail is folded, wound and stored in the sail storage mechanism (2), connected with the unfolding mechanism (3) and unfolded through the unfolding mechanism (3); the pressing mechanism (4) is used for preventing the mast of the unfolding mechanism from expanding;

the limiting locking mechanism (5) comprises a locking block (44) and a locking block limiting mechanism, and in an initial state, the locking block limiting mechanism props against the locking block (44), so that the locking block (44) is connected with a chassis of a mast shaft (24) of the unfolding mechanism, and the mast shaft (24) is fixed; when the sail is in the unfolded state, the locking block limiting mechanism releases the connection between the locking block (44) and the mast shaft (24), releases the limitation on the sailboard (6), unfolds the sailboard (6) and unfolds the film sail.

2. The deployment device according to claim 1, wherein the swing arm (39) comprises a cylindrical structure and a long arm and a short arm which are positioned at two sides of the cylindrical structure, the swing arm (39) is rotatably connected with the bottom cover plate (43) through a through hole on the cylindrical structure, wherein the upper surface of the short arm and the upper surface of the cylindrical structure are positioned at the same horizontal plane, the lower surface of the short arm is positioned at the upper part of the lower surface of the cylindrical structure, the lower surface of the long arm and the lower surface of the cylindrical structure are positioned at the same horizontal plane, and the upper surface of the long arm is lower than the upper surface of the cylindrical structure.

3. A deployment device according to claim 2, characterized in that said support and protection means (1) comprise auxiliary deployment means;

the unfolding mechanism further comprises a lower layer cover plate (35), and a square through hole matched with the locking block (44) is formed in the middle of the lower layer cover plate (35);

the locking block limiting mechanism further comprises a bottom layer cover plate (43), a swing arm (39), a spring, a wire, a locking pin (21) and a bundling plate (22);

a square annular boss is arranged in the middle of the bottom cover plate (43), and the opposite side end faces of the two swing arms (39) are aligned and symmetrically arranged with the outer end face of the boss;

the locking block (44) is a square plate, a groove is formed in the middle of the square plate, a pin is arranged on the groove, a spring is sleeved on the pin, and pins used for being connected with a chassis of the mast shaft are arranged on two sides of the locking block (44);

a spring fixing pin used for fixing one end of a spring is arranged on the bottom cover plate (43), the other end of the spring is connected with one position on the long arm of the swing arm (39), a whole-circumference square groove (40) is arranged on one side, away from the short arm, of the long arm of the swing arm (39), a semicircular groove (41) is arranged on the outer side of the whole-circumference square groove (40) on the swing arm, the two swing arms (39) are tensioned through a wire wound at the whole-circumference square groove, and the two swing arms (39) are connected with the locking pins (21) on the two sides through wires with one ends connected with the semicircular groove (41); the bunching plate (22) consists of two plates which are at right angles, a through hole is formed in the long plate, the large end of the locking pin faces outwards, the other end of the locking pin sequentially penetrates through the through holes in the bunching plate (22) and the sailboard (6) and then is connected with a line, bunching of the sailboard (6) is achieved, and the diameter of the locking pin main body is smaller than the diameters of the bunching plate and the sailboard;

in an initial state, most of the upper surfaces of the long arms of the two swing arms are attached to the lower bottom surface of the locking block (44) and jack up the locking block upwards; the long arm part is positioned below two opposite corners of the locking block, and meanwhile, the outermost end of the long arm of the swing arm is intersected with the linear outline of the adjacent side of the square plate-shaped structure of the locking block, so that the locking of the unfolding mechanism is realized.

4. The unfolding device according to claim 3, further comprising a wire burning mechanism, wherein the wire burning mechanism burns out the wire, unlocks the swing arm (39), the long arm rotates outwards under the traction of the spring, when the short arm end is parallel to the outer contour of the locking block (44), the outer contour of the short arm end circular plate-shaped structure does not intersect with the edge of the locking block contour, and the locking block (44) is separated from the mast shaft (24) under the elastic force of the spring sleeved on the pin column to release the fixation of the unfolding mechanism and automatically falls down to release the locking; the short arm of the swing arm (39) rotates to the central groove of the locking block (44), the outer contour of the circular disc-shaped structure at the end of the short arm cannot collide with the edge of the groove in the process of rotating to the middle position, the outer contour of the circular disc-shaped structure is located inside the outer contour line of the locking block when the swing arm rotates to the middle range, the locking block is fixed on the square boss in the center of the bottom cover plate (43) through the lower surface of the short arm, and meanwhile the line connected with the sailboard (6) looses to unlock the sailboard.

5. The device according to claim 4, characterized in that the mechanism further comprises a mast layer cover plate (18), a central connecting piece (26), a mast shaft top (23), a limiting ring (25), a circular arc mast (29), a lower layer cover plate (35) and a pressing piece (32);

the mast layer cover plate (18) is of a polygonal plate-shaped structure with the periphery inwards concave, cylindrical bosses are arranged at four corners of the bottom surface, circular grooves are formed in the centers of the bosses, circular through holes are formed in the centers of the mast layer cover plate (18) from inside to outside, a first positioning ring (20) and a second positioning ring (19) are sleeved on a small shaft above a mast shaft top (23) and are installed in the through holes, the mast shaft top (23) is positioned by the first positioning ring (20) and the bearing, and a threaded hole is formed in the end part above the mast shaft top (23);

the central connecting piece (26) is of a cylindrical hollow structure, the upper part of the central connecting piece is fixedly connected with the mast shaft top (23), and the external dimension of the central connecting piece (26) is larger than that of the first positioning ring (20) so as to ensure that all parts of the unfolding mechanism are stably connected;

the upper end of the mast shaft (24) is of a cylindrical structure, the lower part of the mast shaft is of a concave curved surface structure, the bottom of the mast shaft is a chassis, a circular through hole is formed in a symmetrical position above the chassis, and an upper threaded hole and a lower threaded hole are symmetrically formed in the circumferential direction of the cylindrical structure at the upper end;

an annular boss is arranged below the mast shaft top (23), the inner side dimension of the annular boss is the same as the size of the cylindrical structure above the mast shaft (24), two threaded holes are symmetrically formed in the circumferential direction of the annular boss and are fixedly connected with lateral threaded holes above the mast shaft (24), and the middle of the mast shaft top (23) is of a disc-shaped structure and used for limiting the circular-arc mast (29) in a winding state;

one end of the circular arc mast (29) is provided with a through hole and is fixedly connected with the middle part of the mast shaft (24), and the whole is wound on the mast shaft (24);

the limiting ring (25) limits the chassis of the mast shaft (24) to limit the mast shaft (24).

6. The unfolding device according to claim 5, characterized in that the lower cover plate (35) is further provided with a circular ring-shaped first boss (38) outside the square through hole, the chassis of the mast shaft (24) is positioned in the first boss (38), polygonal second bosses (37) are uniformly distributed on the lower cover plate (35) in the circumferential direction, and the pressing piece (32) is arranged above the lower cover plate, used for supporting the pressing piece (32) and the arc mast (29), the four corners of the lower cover plate (35) are provided with a limiting hole (36) and a circular groove, the lower end of a screw rod extending out of the middle part of the pressing piece (32) is arranged in the limiting hole (36) to limit the pressing piece (32), a small positioning ring is arranged in the circular groove, a protruding short shaft of the bottom surface of a pressing swing rod (30) of a pressing piece (32) is arranged in the small positioning ring, and the upper surface of the small positioning ring jacks up the pressing piece (32) and supports the pressing piece;

spacing ring (25) are double-deck ring form structure, wherein the inboard diameter of lower floor's ring is greater than the inboard diameter of upper ring, be less than upper ring outside diameter simultaneously, lower floor's ring outside diameter is the biggest, lower floor apron (35) are fixed through the lower floor ring of screw with the spacing ring, the inboard size of the first boss (38) outside of lower floor apron (35) is the same with the lower floor ring of spacing ring, the cooperation location, spacing ring (25) upper ring bottom surface and mast pole axle (24) chassis upper surface contact and carry out spacingly to it.

7. The unfolding device according to claim 6, wherein said pressing member (32) further comprises a pressing swing rod (30), a pressing wheel (31), a bushing (33), a supporting wheel (34), a second torsion spring (27) and a large and small positioning ring;

the pressing swing rod (30) is an integrated vertical plate-shaped structure consisting of two long and short arms at an obtuse angle, the upper top surface and the lower bottom surface are both planes, the middle area of the two surfaces, the short arm part and the inner end part of the long arm near the upper and lower thin plate structures are disconnected, the upper top surface at the turning part of the two arms is provided with a thin-wall annular boss, the lower bottom surface is provided with a circular boss and is concentric with the thin-wall annular boss, the boss at the lower bottom surface is internally provided with a circular through hole penetrating from the upper top surface to the lower bottom surface, the end part of the long and short arm is provided with an upper and lower penetrating threaded hole, the upper and lower surfaces of the long arm near the turning part are provided with a threaded hole and internally provided with a screw rod, the pressing wheels (31) with larger size than the outer ends of the two arms are arranged on the long and short pressing arms at the two ends, the outer side of the thin-wall annular boss at the upper surface is sleeved with a large positioning ring (28) and is integrally arranged in the circular groove at the four corners of the bottom surface of the mast layer cover plate (18), screws are arranged in central through holes of annular bosses on the top surface of the pressing swing rod (30) and are fixedly connected through threaded holes at four corners of the lower-layer cover plate (35) so as to rotate around screw fixed shafts; the middle section of the screw is sleeved with a shaft sleeve (33), the shaft sleeve (33) is of a cylindrical dumbbell-shaped structure with two thick ends and a thin middle part, and the side surface of the supporting wheel (34) is provided with a longitudinal notch to facilitate the supporting wheel to be sleeved on the outer side surface of the middle part of the shaft sleeve; one end of a second torsion spring (27) is inserted into a small round hole at the four corners of the lower cover plate (35), one end of the second torsion spring is propped against the outer side surface of the long arm plate-shaped structure of the pressing swing rod (30), and the lower end of the screw rod of the pressing swing rod (30) close to the turning part of the long and short arms extends out and is installed in a limiting hole (36) at the four corners of the lower cover plate (35).

8. A deployment device according to claim 7, characterized in that said supporting and protecting means (1) further comprise a supporting shaft (7), a top plate (14) and a supporting connection (15);

the supporting shaft (7) is of a cylindrical structure, a disc-shaped structure is arranged below the supporting shaft (7), the main body of the supporting connecting piece (15) is of a disc-shaped structure, a circular positioning ring is arranged below the supporting connecting piece (15), the supporting connecting piece (15) is fixed above the supporting shaft (7), and the external size above the supporting shaft (7) is the same as the internal size of the circular positioning ring below the supporting connecting piece (15) and is matched with the internal size of the circular positioning ring;

a circular through hole and a circular positioning groove are formed in the center of the top plate (14), the size of the circular positioning groove is larger than that of the through hole, threaded holes are formed in the circumferential direction of the annular area, the circular positioning groove is connected and fixed with the peripheral threaded holes of the supporting connecting piece (15) through screws, the disc-shaped structure on the supporting connecting piece (15) is the same as the size of the circular positioning groove so as to be positioned and matched, and the outer size of a circular positioning ring below the supporting connecting piece (15) is the same as that of the circular through hole above the top plate (14) and matched with the circular positioning groove;

four countersunk holes are symmetrically formed in the chassis-shaped structure of the support shaft (7) and are fixedly connected with a threaded hole in the center of the mast layer cover plate (18) through screws, and the inner side surface of the support shaft (7) is matched and positioned with the outer side surface of a second positioning ring (19) in the center of the mast layer cover plate (18).

9. A deployment device according to claim 8, characterized in that the sail storage mechanism (2) comprises a sail shaft (8); the sail shaft (8) is sleeved on the outer surface of the support shaft (7) and can rotate around the common axis of the support shaft in a fixed axis mode, through holes are uniformly distributed on the periphery below the sail shaft (8), the film sail is composed of four isosceles right triangle sail surfaces, the vertex angle of each triangle sail surface is fixedly connected with the through hole below the sail shaft (8), the bottom angles on the same side of the adjacent triangle sail surfaces are connected in pairs and are respectively connected with the outer end of the arc mast (29) corresponding to the lower side, and the formed square sail surface is folded and wound on the sail shaft (8).

10. A device according to claim 9, characterized in that the auxiliary deployment mechanism comprises a first torsion spring (13), a flexible mast (11), an overhanging support plate (17) and a strap (16);

square and arc-shaped protruding structures are uniformly distributed on the periphery of the top plate (14), rigid shafts (9) are arranged on four sides of the top plate (14) through the protruding structures, the sailboard (6) is of a rectangular plate-shaped structure, a strip-shaped circular boss is arranged at the upper edge of the sailboard (6), a through hole is formed in the center of the sailboard, and the rigid shafts (9) penetrate through the through hole in the sailboard (6) to realize that the sailboard (6) rotates around the rigid shafts (9);

a first torsion spring (13) is sleeved at the middle position of the rigid shaft (9), one end of the first torsion spring is propped against the bottom surface of the top plate (14), and the other end of the first torsion spring is propped against the inner side surface of the sailboard (6) to exert outward tension on the sailboard (6);

the elastic mast (11) is strip-shaped, one end of the elastic mast is provided with a round hole and is vertically fixed on the top plate (14) by two bolts, the outer end of the elastic mast is bent inwards and is arranged at the inner side of the sailboard (6), and the elastic mast generates elasticity to exert external tension on the sailboard (6) when being deformed;

overhanging backup pad (17) and lagging (16) main part are rectangle platelike structure, inside all opens has the lightening hole, lagging (6) are including pterygoid lamina and the intermediate lamella of both sides, the pterygoid lamina and roof (14) fixed connection of lagging (6), overhanging backup pad (17) are placed in the intermediate lamella of lagging and the clearance of roof (14), the thickness of overhanging backup pad (17) is less than the height in clearance, the inboard edge in overhanging backup pad (17) bottom surface is equipped with the protruding relative with the side of lagging (16) intermediate lamella, the side of protruding and lagging (16) intermediate lamella is scribbled magnetic material, two parts inter attraction.

Background

The existing spacecraft propulsion technology mainly comprises electric propulsion, chemical propulsion, cold air propulsion and the like, but the propulsion modes have the problems of long development period, high cost, difficulty in storing propellant, limited reserve and the like, and are difficult to provide long-time and uninterrupted thrust for the spacecraft, so that the requirements of high-speed increment and long-distance navigation are met. The solar sail is a spacecraft propulsion system for space navigation by utilizing sunlight pressure, and in a space without resistance, solar photons can continuously impact the solar sail to generate pressure on the surface of the solar sail, so that power is continuously provided for the spacecraft. Compared with the problems existing in the using process of the propellant in the existing propelling mode, the solar sail power is derived from solar photons, is distributed in the space and is continuous, and the service life in the space is not limited by the propelling mode, which is the advantage of the solar sail. Because of this, the solar sail has great advantages in various tasks such as interstellar exploration, sample return, sun pole observation and the like, and is becoming an advantage in a spacecraft propulsion system.

At present, aiming at the design of a solar sail propulsion system unfolding mechanism, the invention patent CN111591471A provides a braking sail derailing device applied to derailment at the end of the service life of a spacecraft, and meanwhile, the design scheme can also be applied to a solar sail propulsion system unfolding device. This design adopts the motor as the inside power supply of device, stores up sail mechanism for open, the integration thick wall structure of cube, and deployment mechanism adopts big pinion engagement transmission power, and locking mechanism adopts spring traction's detachable polygon locking piece to fix. However, this structural solution has some problems: most of the sail surface can be exposed to the external environment by adopting the sail storage mechanism, and the sail surface is easy to damage and the like due to the fact that the thin film sail material is light, thin and easy to crack, and the design scheme easily causes the problems of damage of the sail surface, damage of internal parts and the like, and influences the structural stability of the device; the unfolding mechanism adopts large and small gears for meshing transmission, the transmission efficiency is low, the problems of tooth surface damage, inter-tooth transmission locking and the like are easy to occur, and the gears and bearings used in cooperation can cause the over-heavy quality of the device and influence the portability, navigation speed, distance and other performances of the unfolding mechanism; the locking mechanism is designed into a spring traction type simple structure, the problem that the locking mechanism has overlarge movement freedom degree in the unlocking process of the device is solved, collision and movement interference are easily caused to working parts in the device, the movement positions of the parts cannot be accurately positioned, and the controllability and the reliability of the device are poor.

Disclosure of Invention

The invention aims to provide a solar sail propulsion system unfolding device applied to a micro-nano satellite.

The technical solution for realizing the purpose of the invention is as follows: a micro-nano satellite solar sail propulsion system unfolding device comprises a supporting protection mechanism, a sail storage mechanism, an unfolding mechanism, a pressing mechanism and a limiting locking mechanism;

the supporting and protecting mechanism is used for supporting and protecting parts of the unfolding device and comprises a deployable sailboard; the film sail is folded, wound and stored in the sail storage mechanism, connected with the unfolding mechanism and unfolded through the unfolding mechanism; the pressing mechanism is used for preventing the mast of the unfolding mechanism from expanding;

the limiting locking mechanism comprises a locking block and a locking block limiting mechanism, and in an initial state, the locking block limiting mechanism props against the locking block, so that the locking block is connected with a chassis of a mast shaft of the unfolding mechanism, and the mast shaft is fixed; when the sail is unfolded, the locking block limiting mechanism contacts the connection between the locking block and the mast shaft, the limitation on the sailboard is removed, the sailboard is unfolded, and the film sail is unfolded.

Further, the swing arm includes the cylinder structure and is located the long arm and the short arm of cylinder structure both sides, and the swing arm passes through the through-hole on the cylinder structure and is connected with the rotation of bottom apron, and wherein the upper surface of short arm and the upper surface of cylinder structure are located same horizontal plane, and the lower surface of short arm is located the upper portion of cylinder structure lower surface, and the lower surface of long arm and the lower surface of cylinder structure are located same horizontal plane, and the upper surface of long arm is less than the upper surface of cylinder structure.

Further, the support protection mechanism comprises an auxiliary unfolding mechanism;

the unfolding mechanism also comprises a lower-layer cover plate, and the middle part of the lower-layer cover plate is provided with a square through hole matched with the locking block;

the locking block limiting mechanism further comprises a bottom cover plate, a swing arm, a spring, a wire, a locking pin and a bundling plate;

the middle part of the bottom cover plate is provided with a square annular boss, and the opposite side end faces of the two swing arms are aligned and symmetrically arranged with the outer end face of the boss;

the locking block is a square plate, a groove is formed in the middle of the square plate, a pin is arranged on the groove, a spring is sleeved on the pin, and pins used for being connected with a chassis of the mast shaft are arranged on two sides of the locking block;

the bottom cover plate is provided with a spring fixing pin for fixing one end of a spring, the other end of the spring is connected with one position on the long arm of the swing arm, one side of the long arm of the swing arm, which is far away from the short arm, is provided with a whole-circumference square groove, the outer side of the whole-circumference square groove on the swing arm is provided with a semicircular groove, the two swing arms are tensioned through a wire wound at the whole-circumference square groove, and the two swing arms are respectively connected with locking pins at two sides through a wire with one end connected with the semicircular groove; the beam collecting plate consists of two right-angled plates, a through hole is formed in the long plate, the large end of the locking pin faces outwards, the other end of the locking pin sequentially penetrates through the through holes in the beam collecting plate and the through hole in the sailboard and then is connected with a line, beam collection of the sailboard is achieved, and the diameter of the locking pin main body is smaller than the diameters of the beam collecting plate and the diameter of the sailboard;

in an initial state, the upper surfaces of the long arm parts of the two swing arms are attached to the lower bottom surface of the locking block and jack up the locking block upwards; the long arm is mostly arranged below two opposite corners of the locking block, and meanwhile, the outermost end of the long arm of the swing arm is intersected with the linear outline of the adjacent side of the square plate-shaped structure of the locking block, so that the locking of the unfolding mechanism is realized.

The wire burning mechanism blows the wire, unlocks the swing arm, the long arm rotates outwards under the traction of the spring, when the short arm end is parallel to the outer contour of the locking block, the outer contour of the cylindrical structure is not intersected with the edge of the outer contour of the locking block, the locking block is separated from the mast shaft under the elastic force action of the spring sleeved on the pin column to release the fixation of the unfolding mechanism and automatically fall down, and the locking is released; its short arm will be changeed to the central groove department of locking piece along with the rotation of swing arm, and the outer profile of short arm end circular disk structure can not collide with the recess edge when changeing the intermediate position and the outer profile of its circular disk structure is located locking piece outer profile line when the swing arm changes the intermediate range inside to fix the locking piece on the square boss of bottom apron central authorities through the short arm lower surface, the line that links to each other with the sailboard simultaneously relaxs and unlocks the sailboard.

Furthermore, the unfolding mechanism also comprises a mast layer cover plate, a central connecting piece, a mast shaft top, a limiting ring, a circular arc mast, a lower layer cover plate and a pressing piece;

the mast layer cover plate is of a polygonal plate-shaped structure with the periphery inwards concave, cylindrical bosses are arranged at four corners of the bottom surface, circular grooves are arranged at the centers of the bosses, circular through holes, a first positioning ring and a second positioning ring are arranged at the center of the mast layer cover plate from inside to outside, a bearing is sleeved on a small shaft above the top of a mast shaft and is arranged in the through holes, the first positioning ring and the bearing position the top of the mast shaft, and a threaded hole is arranged at the upper end part of the top of the mast shaft;

the central connecting piece is of a cylindrical hollow structure, the upper part of the central connecting piece is fixedly connected with the mast shaft top, and the external dimension of the central connecting piece is larger than that of the first positioning ring so as to ensure that all parts of the unfolding mechanism are stably connected;

the upper end of the mast shaft is of a cylindrical structure, the lower part of the mast shaft is of a concave curved surface structure, the bottom of the mast shaft is a chassis, circular through holes are symmetrically formed in the upper part of the chassis, and an upper threaded hole and a lower threaded hole are symmetrically formed in the circumferential direction of the cylindrical structure at the upper end;

the circular boss is arranged below the mast shaft top, the size of the inner side of the circular boss is the same as that of the cylindrical structure above the mast shaft, the circular boss is symmetrically provided with two threaded holes in the circumferential direction and is fixedly connected with the lateral threaded holes above the mast shaft, and the middle of the mast shaft top is of a disc-shaped structure for limiting the circular mast in a winding state;

one end of the arc mast is provided with a through hole and is fixedly connected with the middle part of the mast shaft, and the arc mast is integrally wound on the mast shaft;

the limiting ring limits the chassis of the mast shaft to limit the position of the mast shaft.

Furthermore, the lower cover plate is also provided with a circular first boss outside the square through hole, the mast shaft chassis is positioned in the first boss, polygonal second bosses are uniformly distributed on the periphery of the lower cover plate, a pressing piece is arranged above the lower cover plate and used for supporting the pressing piece and the arc mast, a limiting hole and a circular groove are formed in the four corners of the lower cover plate, the lower end of a screw rod extending out of the middle of the pressing piece is arranged in the limiting hole to limit the pressing piece, a small positioning ring is arranged in the circular groove, a protruding short shaft of the pressing piece for pressing the bottom surface of the swing rod is arranged in the small positioning ring, and the upper surface of the small positioning ring jacks up the pressing piece and supports the pressing piece;

the spacing ring is double-deck ring form structure, and wherein the inboard diameter of lower floor's ring is greater than the inboard diameter of upper ring, is less than upper ring outside diameter simultaneously, and lower floor's ring outside diameter is the biggest, and lower floor's apron is fixed through screw and lower floor's ring, and the first boss outside of lower floor's apron is the same with the inboard size of lower floor's ring, cooperation location, spacing ring upper strata ring bottom surface and mast axle chassis upper surface contact and carry on spacingly to it.

Furthermore, the pressing piece also comprises a pressing swing rod, a pressing wheel, a shaft sleeve, a supporting wheel, a second torsion spring and a large positioning ring and a small positioning ring;

the pressing swing rod is an integrated vertical plate-shaped structure consisting of two long and short arms at an obtuse angle, the upper top surface and the lower bottom surface are both planes, the middle areas of the two surfaces, the short arm parts and the inner end parts of the long arms, except for upper and lower thin plate structures, are disconnected, the upper top surface at the turning parts of the two arms is provided with a thin-wall annular boss, the lower bottom surface is provided with a circular boss and is concentric with the thin-wall annular boss, a circular through hole penetrating from the upper top surface to the lower bottom surface is formed inside the boss of the lower bottom surface, the end parts of the long and short arms are provided with upper and lower penetrating threaded holes, a threaded hole is formed between the upper surface and the lower surface of the long arm, the threaded hole is internally provided with a screw rod, pressing wheels with larger sizes than the outer ends of the two arms are arranged on the two long and short pressing arms at the two ends, a large positioning ring is sleeved outside the thin-wall annular boss of the upper surface and is integrally arranged inside a circular groove at the four corners of the bottom surface of the cover plate of the mast layer, screws are arranged inside the central through hole of the annular boss of the pressing swing rod and are connected and fixed through the threaded holes at the four corners of the lower cover plate Fixing the screw to rotate around the fixed axis of the screw; the middle section of the screw is sleeved with a shaft sleeve, the shaft sleeve is of a cylindrical dumbbell-shaped structure with two thick ends and a thin middle part, and the side surface of the supporting wheel is provided with a longitudinal notch which is convenient for sleeving the supporting wheel on the outer side surface of the middle part of the shaft sleeve; one end of the second torsion spring is inserted into the small round holes at the four corners of the lower cover plate, one end of the second torsion spring is propped against the outer side surface of the long-arm plate-shaped structure of the pressing swing rod, and the lower end of the screw rod of the pressing swing rod, which is close to the turning position of the long and short arms, extends out and is installed in the limiting holes at the four corners of the lower cover plate.

Furthermore, the supporting and protecting mechanism also comprises a supporting shaft, a top plate and a supporting connecting piece;

the supporting shaft is of a cylindrical structure, a disc-shaped structure is arranged below the supporting shaft, the main body of the supporting connecting piece is of a disc-shaped structure, a circular positioning ring is arranged below the supporting connecting piece, the supporting connecting piece and the supporting shaft are fixed, and meanwhile, the supporting shaft is arranged in a circular through hole in the center of the top plate;

a circular through hole and a circular positioning groove are formed in the center of the top plate, the size of the circular positioning groove is larger than that of the through hole, threaded holes are formed in the circumferential direction of the annular area and are connected and fixed with threaded holes in the periphery of the supporting connecting piece through screws, the disc-shaped structure on the supporting connecting piece is the same as the circular positioning groove in size so as to be positioned and matched with the circular positioning groove, and the size of the inner side of the disc-shaped structure below the supporting connecting piece is the same as the size of the outer portion above the supporting shaft and is matched with the outer portion above the supporting shaft;

four countersunk holes are symmetrically formed in the disc-shaped structure at the bottom of the supporting shaft and are fixedly connected with a threaded hole in the center of the mast layer cover plate through screws, and the inner side surface of the supporting shaft is matched and positioned with the outer side surface of a second positioning ring in the center of the mast layer cover plate.

Further, the sail storage mechanism comprises a sail shaft; the film sail is composed of four isosceles right-angle triangular sail surfaces, the vertex angle of each triangular sail surface is fixedly connected with the through hole below the sail shaft, the same-side base angles of the adjacent triangular sail surfaces are connected in pairs and respectively connected with the outer ends of the corresponding arc masts below, and the formed square sail surface is folded and wound on the sail shaft.

Further, the auxiliary unfolding mechanism comprises a first torsion spring, an elastic mast, an outward extending support plate and a sleeve plate;

square and arc-shaped protruding structures are uniformly distributed on the periphery of the top plate, rigid shafts are arranged on four sides of the top plate through the protruding structures, the sailboard is of a rectangular plate-shaped structure, a strip-shaped circular boss is arranged at the upper edge of the sailboard, a through hole is formed in the center of the sailboard, and the rigid shafts penetrate through the through hole in the sailboard, so that the sailboard rotates around the rigid shafts;

a first torsion spring is sleeved on the middle position of the rigid shaft, one end of the first torsion spring is propped against the bottom surface of the top plate, and the other end of the first torsion spring is propped against the inner side surface of the sailboard to exert outward tension on the sailboard;

the elastic mast is strip-shaped, one end of the elastic mast is provided with a round hole and is mutually and vertically fixed on the top plate by screws in pairs, the outer end of the elastic mast is bent inwards and is arranged at the inner side of the sailboard, and the elastic mast generates elastic force to act external tension on the sailboard when being deformed;

overhanging backup pad and lagging main part are rectangle platelike structure, and inside all opens has the lightening hole, and the lagging includes pterygoid lamina and the intermediate lamella of both sides, the pterygoid lamina and the roof fixed connection of lagging, overhanging backup pad is placed in the intermediate lamella of lagging and the space of roof, and overhanging backup pad thickness is less than the height in space, and the inboard edge in overhanging backup pad bottom surface is equipped with the protruding relative with the side of lagging intermediate lamella, and the side of protruding and lagging (16) intermediate lamella scribbles magnetic material, two parts inter attraction.

Compared with the prior art, the invention has the remarkable advantages that:

(1) the invention adopts weight reduction design at a plurality of positions on the structure, has small integral volume, light weight and high functional density, can keep higher speed increment in navigation, and is suitable for a micro-nano satellite spacecraft propulsion system.

(2) According to the invention, the sailboard is designed to isolate the internal original components from the external environment, so that the influence of external interference on the function of the device in the installation and transportation processes is prevented, and meanwhile, the power source can be designed to drive the sailboard to be unfolded, so that the reliability of the device is improved.

(3) The invention designs that a locking block and a mast shaft are matched and installed to fix a spreading mechanism, the opposite side surfaces of two swing arms are tightly attached to the outer side surface of a square boss in the center of a bottom cover plate in an initial state, the two swing arms are tightly bound and fixed through a thin wire, the upper top surfaces of the long arm parts of the two swing arms are tightly attached to the lower bottom surface of the locking block, and the locking block is jacked upwards; in the initial state, most of the long arms in the swing arms are positioned below two opposite corners of the locking block, and the outermost ends of the long arms of the swing arms are intersected with the linear outer contours of the adjacent sides of the square plate-shaped structures of the locking block; the short arm is a plate-shaped structure which is long-strip-shaped and circular at the outer side close to the rotating shaft, the long arm end starts to rotate outwards after the two swing arms are unlocked through the wire burning mechanism, and when the short arm end is parallel to the outline of the locking block, the outline of the circular plate-shaped structure is not intersected with the outline edge of the locking block, so that the reliable falling of the circular plate-shaped structure can be ensured; along with the swing arm continues to rotate, the short arm end rotates to the middle area of the locking block, the outline of the outer edge of the short arm end is located inside the locking block, the lower surface of the short arm end of the swing arm is tightly attached to the upper surface of the middle groove of the locking block falling onto the square boss in the center of the bottom cover plate, and the locking block can be reliably fixed on the square boss in the center of the lower cover plate.

(4) The invention directly inputs power into the unfolding mechanism to control the mast to unfold, saves a power transmission mechanism, simplifies the structural design, lightens the device mass and improves the transmission efficiency and the overall reliability of the device.

(5) The invention designs the top plate connecting piece and the central connecting piece, and rigidly connects the supporting protection mechanism, the sail storage mechanism and the unfolding mechanism through structural design, thereby preventing the disassembly and the damage of the device mechanism caused by vibration or external environment influence and improving the integral reliability of the device.

Drawings

Fig. 1 is a schematic three-dimensional structure diagram of a deployment device of a solar sail propulsion system according to the present invention.

Fig. 2 is a schematic view of the assembly of the support shaft and sail shaft of the present invention.

FIG. 3 is a top view of the top plate assembly of the support and protection mechanism of the present invention.

FIG. 4 is a schematic view of the position and assembly between two adjacent windsurfing boards according to the present invention.

Fig. 5 is a schematic view of the structure of the supporting and connecting member of the present invention.

FIG. 6 is a schematic view of the bottom surface of the top plate assembly supporting the protection mechanism of the present invention.

FIG. 7 is a schematic view of the assembly of the mast layer cover plate and mast pillow block of the present invention.

FIG. 8 is a schematic view of the overall assembly of the mast shaft of the present invention without the mast installed.

Fig. 9 is a schematic view of the structure of the central connecting member of the present invention.

FIG. 10 is a schematic view of the deployment mechanism of the present invention after assembly.

Fig. 11 is a partially assembled view of the hold-down mechanism of the present invention.

FIG. 12 is a schematic view of the assembly and positional relationship of the lower cover plate and the pressing mechanism of the present invention.

Fig. 13 is a schematic structural view of the bushing of the present invention.

Fig. 14 is a schematic structural view of a swing arm in the present invention.

Fig. 15 is an assembly schematic diagram of the limit locking mechanism of the present invention.

Fig. 16 is a schematic view of the locking block structure of the present invention.

Description of reference numerals:

1-support protection mechanism, 2-sail storage mechanism, 3-deployment mechanism, 4-hold down mechanism, 5-limit lock mechanism, 6-sail board, 7-support shaft, 8-sail shaft, 9-rigid shaft, 10-second threaded hole, 11-flexible mast, 12-first threaded hole, 13-first torsion spring, 14-top board, 15-support connector, 16-sleeve board, 17-overhanging support board, 18-mast layer cover board, 19-second positioning ring, 20-first positioning ring, 21-locking pin, 22-binding board, 23-mast shaft top, 24-mast shaft, 25-limit ring, 26-center connector, 27-second torsion spring, 28-large positioning ring, 29-arc mast, 30-a pressing swing rod, 31-a pressing wheel, 32-a pressing piece, 33-a shaft sleeve, 34-a supporting wheel, 35-a lower cover plate, 36-a limiting hole, 37-a second boss, 38-a first boss, 39-a swing arm, 40-a whole-circumference square groove, 41-a semicircular groove, 42-a square groove, 43-a bottom cover plate and 44-a locking block.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

As shown in fig. 1-16, a solar sail propulsion system deployment device applied to a micro-nano satellite is composed of a support protection mechanism 1, a sail storage mechanism 2, a deployment mechanism 3, a pressing mechanism 4 and a limit locking mechanism 5 from top to bottom, wherein the support protection mechanism 1 is used for connecting and supporting all mechanism parts in the device and protecting an internal structure from being damaged due to external interference such as vibration; a sail shaft 8 is arranged in the sail storage mechanism 2, a film sail in a folded and wound state is placed in the sail storage mechanism, and the film sail is connected with the lower unfolding mechanism 3 and can be unfolded under the traction of the film sail shaft; the unfolding mechanism 3 consists of an arc-shaped mast 29, a mast shaft 24 and a mast layer cover plate 18, wherein the arc-shaped mast 29 is fixedly wound on the mast shaft 24, the outer end of the arc-shaped mast 29 is connected with the four corners of the square film sail above, and the sail surface is unfolded along with the outward extension of the outer end of the mast 29; the pressing mechanisms 4 are circumferentially and uniformly distributed on the outer side of the mast 29 in a winding state and apply radial pressing force to the mast to prevent the mast from expanding, and meanwhile, the limiting structures on the pressing mechanisms 4 can prevent the mast from falling off from the device; the solar sail unfolding device is provided with a plurality of limiting and locking mechanisms 5 for limiting and locking the unfolding mechanisms 3 and the sailboards 6.

As shown in fig. 2, the entire sail storage mechanism 2 is a cubic hollow structure, wherein the sail shaft 8 is sleeved on the outer surface of the support shaft 7 and can be fixed to rotate around the common axis, a circular disc-shaped structure is arranged below the support shaft 7 and is symmetrically provided with four countersunk holes, through holes are uniformly distributed around the lower part of the sail shaft 8, the film sail is composed of four isosceles right triangle sail surfaces, the vertex angle of each triangle sail surface is fixedly connected with the through hole below the sail shaft 8, the same side base angles of adjacent triangle sail surfaces are connected in pairs and are connected with the outer ends of the arc masts 29 corresponding to the lower part, and the formed square sail surface is folded and wound on the sail shaft 8.

As shown in fig. 2-6, the supporting protection mechanism 1 is composed of a supporting shaft 7, a top plate 14, a supporting connecting member 15, a sailboard 6 and an auxiliary unfolding mechanism, wherein the supporting shaft 7 is of a cylindrical structure, a threaded hole is formed in the center of the circular surface of the top part, the main body of the supporting connecting member 15 is of a disc-shaped structure, threaded holes are formed in the periphery and the center of the supporting connecting member, a circular positioning ring is formed below the supporting connecting member, the supporting connecting member 15 is fixed above the supporting shaft 7 through the threaded hole in the center of the supporting connecting member, and the supporting shaft 7 is installed inside the circular through hole in the center of the top plate 14.

A circular through hole and a circular positioning groove are formed in the center of the top plate 14, the size of the circular positioning groove is larger than that of the through hole, threaded holes are formed in the circumferential direction of the annular area and are connected and fixed with threaded holes in the periphery of the supporting connecting piece 15 through screws, the disc-shaped structure on the supporting connecting piece 15 is the same as the circular positioning groove in size so as to be positioned and matched with the circular positioning groove, and the size of the inner side of the disc-shaped structure below the supporting connecting piece 15 is the same as the size of the outer portion above the supporting shaft 7 and is matched with the outer portion above the supporting shaft; square and arc-shaped protruding structures are uniformly distributed on the periphery of the top plate 14, round blind holes and through holes are formed in the protruding structures, a rigid shaft 9 is mounted inside the top plate, the sailboard 6 is of a rectangular plate-shaped structure, a strip-shaped round boss is formed in the upper edge of the sailboard, a through hole is formed in the center of the sailboard, the size of the through hole is the same as that of the rigid shaft 9, and the sailboard 6 is fixed to the side direction of the solar sail deployment device through the rigid shaft 9 and the round boss and can rotate around the rigid shaft 9.

The auxiliary unfolding mechanism consists of a first torsion spring 13, an elastic mast 11, an outward extending support plate 17 and a sleeve plate 16, wherein the first torsion spring 13 is sleeved at the middle position of two rigid shafts 9 uniformly distributed around the top plate 14, one end of the first torsion spring is propped against the bottom surface of the top plate 14, and the other end of the first torsion spring is propped against the inner side surface of the sailboard 6 to exert outward tension on the sailboard 6; four first threaded holes 12 and square grooves are uniformly distributed on two diagonal lines of the top plate 14, the elastic mast 11 is strip-shaped, one end of the elastic mast is provided with a round hole and is mutually and vertically fixed on the top plate 14 by screws in pairs, the outer end of the elastic mast is bent inwards and is arranged on the inner side of the sailboard 6, and the elastic mast generates elasticity to exert external tension on the sailboard 6 when being deformed; the overhanging support plate 17 and the sleeve plate 16 are rectangular plate-shaped structures, lightening holes are formed in the overhanging support plate 17 and the sleeve plate 16, threaded holes are formed in wing plates on two sides of the sleeve plate, second threaded holes 10 with the same size are formed in the same positions of the top plate 14 along the direction of each side and are fixedly connected with the sleeve plate 16 through screws, the middle section of the sleeve plate 16 is bent downwards and is spaced from the top plate 14, the overhanging support plate 17 is installed in the gap and is in transition fit, magnetic materials are coated on the protruding part of the inner side edge of the bottom surface of the overhanging support plate 17 and the end surface of the inner side edge of the sleeve plate 16, and the two parts attract each other.

A square shallow groove is formed in the four corners of the top plate 14, a threaded hole is formed in the right angle of the groove, the width of each elastic mast 11 is equal to the distance from the side surface of the groove to the same side edge of the boss, the two elastic masts 11 are vertically arranged in the same groove and are connected with the top plate 14 at the end parts, the outer ends of the elastic masts extend out of the outer edge of the top plate and are bent downwards through a gap between the inner side surface of the circular boss on the upper edge of the sailboard 6 and the top plate 14, and the lower ends of the elastic masts are abutted against the inner side surface of the sailboard 6; the middle parts of the two rigid shafts 9 on one side of the top plate 14 are disconnected for convenient installation, and a first torsion spring 13 is sleeved on the top plate 14, two ends of the first torsion spring 13 respectively abut against the upper surface of the top plate 14 and the inner side surface of the sailboard 6, and the elastic mast and the first torsion spring apply external tension to the sailboard 6.

The outer side surface large-area and the lower right corner of the sailboard 6 are provided with square grooves, through holes are formed in the grooves of the lower right corner, the bundling plate 22 is a right-angle thin folded plate, the outer ends of the long sides are provided with the through holes, the size of the through holes is the same as that of the through holes below the sailboard 6, the radius of the head of the locking pin 21 is larger than the diameter of the through holes, the size of the cylindrical pin body is smaller than that of the through holes, and the sailboard 6 is limited by inwards mounting the two through holes. The lower edge of the square groove is at a certain distance from the lower edge of the windsurfing board 6 to prevent the beam-collecting board 22 from being separated from the adjacent windsurfing board, and the mass can be reduced by forming the square groove on the surface of the windsurfing board 6 in a large area.

The unfolding mechanism 3 consists of a mast layer cover plate 18, a central connecting piece 26, a mast shaft top 23, a mast shaft 24, a limiting ring 25, a circular arc mast 29 and a lower layer cover plate 35, the mast layer cover plate 18 is a polygonal plate-shaped structure with the periphery inwards concave, cylindrical bosses are arranged at four corners of the bottom surface, a circular groove is arranged at the center of each boss, a first positioning ring, a second positioning ring and a circular through hole are arranged at the center of the mast layer cover plate 18 from small to large, the bearing is sleeved on the small shaft above the mast shaft top 23 and is arranged in the through hole, the first positioning ring 20 and the bearing position the mast shaft top 23, the upper end part of the mast shaft top 23 is provided with a threaded hole, the central connecting piece 26 is of a cylindrical hollow structure, a countersunk hole is formed above the central connecting piece and is fixedly connected with the mast shaft top 23 through a screw, and the external dimension of the central connecting piece 26 is larger than that of the first positioning ring 20 so as to ensure that all parts of the unfolding mechanism are stably connected; the lower part of the mast shaft top 23 is an annular boss, the inner side dimension of the annular boss is the same as the size of the cylindrical structure above the mast shaft 24, the annular boss is symmetrically provided with two threaded holes in the circumferential direction and is fixedly connected with the lateral threaded holes above the mast shaft 24, and the middle part of the mast shaft top 23 is a disc-shaped structure for limiting the circular arc mast 29 in a winding state.

The upper end of the mast shaft 24 is of a cylindrical structure, the lower portion of the mast shaft is of a concave curved surface structure, the bottom of the mast shaft is of a circular disc-shaped structure, circular through holes are symmetrically formed in the upper portion of the mast shaft, an upper threaded hole and a lower threaded hole are symmetrically formed in the circumferential direction of the cylindrical structure of the upper end, one end of the arc-shaped mast 29 is provided with the through holes, the through holes are fixedly connected with the threaded holes in the middle of the mast shaft 24 through screws, and the arc-shaped mast is integrally wound on the mast shaft 24.

Four threaded holes are symmetrically formed in the center of the mast layer cover plate 18, four countersunk holes are symmetrically formed in the disc-shaped structure at the bottom of the support shaft 7 and are fixedly connected with the threaded holes in the center of the mast layer cover plate 18 through screws, and the inner side surface of the support shaft 7 is matched and positioned with the outer side surface of a second positioning ring 19 in the center of the mast layer cover plate 18.

The pressing mechanism is composed of a pressing swing rod 30, a pressing wheel 31, a shaft sleeve 33, a supporting wheel 34, a second torsion spring 27 and a large positioning ring and a small positioning ring, the pressing swing rod 30 is an integrated vertical plate-shaped structure composed of two long and short arms at an obtuse angle, the upper top surface and the lower bottom surface are both planes, the middle areas of the two surfaces, the short arm parts and the inner end parts of the long arms are disconnected except for upper and lower thin plate structures, a thin-wall annular boss is arranged on the upper top surface of the turning part of the two arms, a circular boss is arranged on the lower bottom surface and concentric with the thin-wall annular boss, a circular through hole penetrating from the upper top surface to the lower bottom surface is arranged in the boss of the lower bottom surface, upper and lower penetrating threaded holes are arranged at the end parts of the long arms, a threaded hole is arranged between the upper surface and the lower surface of the turning part of the long arms, a screw rod is arranged in the inner part, the pressing arms at the two long and short pressing arms at the two ends of the two ends, the pressing arms, the pressing wheel 31 with larger size than the outer end of the two arms, the large positioning ring boss of the thin wall of the upper surface is sleeved with the positioning ring 28 and integrally arranged on the mast layer cover Screws are arranged in the circular grooves at the four corners of the bottom surface of the plate 18, and the central through holes of the annular bosses at the top surface of the pressing swing rod 30 are fixedly connected through threaded holes at the four corners of the lower-layer cover plate 35 to enable the pressing swing rod to rotate around a screw fixed shaft; the middle section of the screw is sleeved with a shaft sleeve 33, the shaft sleeve 33 is of a cylindrical dumbbell-shaped structure with two thick ends and a thin middle part, and the side surface of the supporting wheel 34 is provided with a longitudinal notch to facilitate the supporting wheel to be sleeved on the outer side surface of the middle part of the shaft sleeve; one end of the second torsion spring 27 is inserted into a small round hole at four corners of the lower cover plate 35, and the other end of the second torsion spring abuts against the outer side surface of the long arm plate-shaped structure of the pressing swing rod 30, and the lower end of the screw rod of the pressing swing rod 30, which is close to the turning point of the long and short arms, extends out and is installed in a limiting hole 36 at four corners of the lower cover plate 35.

The central part of the lower cover plate 35 is provided with a square through hole and a circular first boss 38, a disc-shaped structure below the mast shaft 24 and the first boss 38 have the same internal size and are matched with each other, polygonal second bosses 37 are uniformly distributed on the periphery of the lower cover plate 35, the bottom surface of the long arm end of the pressing piece 32 is arranged above the lower cover plate for supporting the pressing piece 32 and the circular mast 29, the four corners of the lower cover plate 35 are provided with a limiting hole 36 and a circular groove, meanwhile, the circular groove is internally provided with a threaded hole and a screw, the lower end of a screw rod extending out of the middle of the pressing piece 32 is arranged in the limiting hole 36 for limiting the pressing piece 32, a small positioning ring is arranged in the circular groove, the small positioning ring is internally provided with a convex short shaft on the bottom surface of the pressing swing rod 30, and the upper surface of the.

The limiting ring 25 is of a double-layer circular ring structure, the inner side diameter of a lower layer circular ring is larger than that of an upper layer circular ring, and is smaller than that of an upper layer circular ring, the outer side diameter of the lower layer circular ring is the largest, threaded holes are circumferentially formed between the upper surface and the lower surface of the lower layer circular ring structure, four threaded holes are symmetrically formed in the middle of a lower layer cover plate 35 and are fixed with the limiting ring 25 through screws, the outer side of a first boss 38 of the lower layer cover plate is the same as the inner side of the lower layer circular ring of the limiting ring 25 in size and is matched and positioned, and the bottom surface of the upper layer circular ring of the limiting ring 25 is in close contact with and limits the upper surface of the disc-shaped structure of the mast shaft 24.

The limiting locking mechanism 5 comprises a swing arm 39, a locking block 44, a bottom cover plate 43 and a locking pin 21, the middle of the swing arm 39 is of a cylindrical structure, a through hole is formed in the center of the swing arm 39, two threaded holes are oppositely formed in the center of the bottom cover plate 43, a screw and the swing arm 39 are installed inside the bottom cover plate to enable the bottom cover plate to rotate around the axis of the cylindrical structure, long and short arms are respectively arranged at two ends of the swing arm 39, a semicircular groove 41 and a whole-circumference square groove 40 are formed in the inner side of the outer end of the long arm, a square groove 42 is formed in the inner side of the inner end of the long arm, an annular groove is formed in the middle of the cylindrical pin body structure of the locking pin 21, the inner side of the semicircular groove 41 of the swing arm 39 is connected with the annular groove of the locking pin 21 at the corresponding position through a string, a square-ring-shaped boss is formed in the center of the bottom cover plate 43, the opposite side end faces of the two swing arms 39 are aligned and symmetrically installed with the outer end faces of the boss, the whole-circumference square grooves 40 on the two opposite swing arms 39 are tightly bound through the string, the string is arranged in the wire burning mechanism and can be burnt out, and the spring is arranged in the square groove 42 at the inner side of the middle part of the swing arm 39 and is connected with the screws arranged on the four sides of the bottom cover plate 43.

The locking block 44 is of a square plate-shaped structure, a square through groove is formed in the middle of the locking block 44, a plurality of cylindrical pin structures are formed in the upper surface of the locking block, the locking block 44 is installed in the square through hole in the center of the lower cover plate to be matched with the square through hole and tightly attached to the lower surface of the mast shaft 24, two cylindrical pins are installed in the circular through hole to be locked, the upper surface of the swing arm 39 abuts against the bottom surface of the locking block 44, and a spring is installed on the cylindrical pin in the middle of the locking block 44 and is in a compressed state.

The working principle of the invention is as follows:

in a locked state: the four right-angled triangular sail surfaces form a square film sail, the square film sail is connected with the sail shaft 8 through a top angle and is folded and wound on the sail shaft 8, four right-angle positions of the square sail surface are connected with the outer end of a lower circular arc-shaped mast 29, and the inner end of the circular arc-shaped mast 29 is rigidly connected with a mast shaft 24 and is wound on the mast shaft 24; under the locking state, the two opposite swing arms 39 are tightly bound through thin wires and upwards abut against the locking blocks 44, the mast shaft 24 is fixed through cylindrical pin structures on the locking blocks 44, the swing arms 39 are connected with screws on the outer sides through springs to act on outward pulling force, the outer ends of the swing arms 39 are connected with circumferential through grooves on cylindrical pin bodies of the locking pins on the same side through thin ropes, and the two opposite swing arms 39 are kept static under the action of the thin ropes; the outer end of the overhanging support plate 17 is pressed against the inner side of the windsurfing board 6 by the magnetic force of mutual attraction, and the locking pin 21 is arranged at the lower part of the windsurfing board 6 and limits the windsurfing board 6 in a closed state by the inward traction of thin lines.

In the unfolded state: the thread burning mechanism burns out threads which are arranged in the thread burning mechanism and used for binding two opposite swing arms 39 tightly, the swing arms 39 rotate outwards under the action of springs initially, the threads connected between the outer ends of the swing arms and the locking pins 21 loosen to separate the locking pins 21 from the sailboards 6, then the binding plates 22 are separated from the device to release the constraint on the sailboards 6 on the periphery, the bent elastic masts 11 and the first torsion springs 13 are arranged on the inner sides of the four sailboards 6, after the constraint is released, the sailboards 6 are stretched by external tension of the sailboards 6, the outwards extending supporting plates 17 move outwards under the action of magnetic force of mutual attraction along with the stretching of the sailboards 6 and abut against the sailboards 6 through the upper surfaces, so that the stretched sailboards 6 are kept in a horizontal state, and after the sailboards 6 are completely stretched, the inner sides of the supporting plates 17 abut against the inner sides of the sleeving plates 16 and stop moving;

after the swing arm 39 rotates a certain angle, the locking block 44 with the top surface jacked up is bounced downwards under the elastic force of the spring arranged in the middle of the locking block to be in contact with the bottom cover plate 43, the short arm of the swing arm 39 rotates to reach the middle position, the lower surface of the locking block is flush with the upper surface of the middle through groove of the locking block 44 so as to ensure that the two opposite swing arms 39 fix the locking piece 44 through the short arm of the swing arm, and meanwhile, the mast shaft 24 rotates to pull the mast to extend outwards to unfold the film sail.