1. The utility model provides an improved generation over-and-under type scaffold, includes two levers (11) that return type frame (10) and cross-over hinge at two return type frame (10) front ends that bilateral symmetry set up, its characterized in that: the two levers (11) are connected in a hinged mode, two groups of levers (11) are symmetrically arranged in the front and back direction, the left end of the clip-shaped frame (10) is of a clip-shaped structure, the opposite sides of the vertical section of the clip-shaped frame (10) are provided with lifting grooves (101), the side wall of the vertical section of the clip-shaped frame (10) is provided with a plurality of threaded holes (102), the threaded holes (102) are distributed at equal intervals along the height direction of the clip-shaped frame (10), the front end and the back end of the top of the horizontal section above the clip-shaped frame (10) are symmetrically provided with round holes (103), and the front end and the back end of the bottom of the clip-shaped frame (10) are symmetrically provided with universal wheels (12);

the back sides of the horizontal sections below the two square-shaped frames (10) are provided with two positioning mechanisms (13), the front and back of each positioning mechanism (13) are symmetrically provided with two positioning mechanisms, each positioning mechanism (13) comprises a side extension plate (131) arranged on the side wall of the square-shaped frame (10), the front end and the back end of the bottom of each side extension plate (131) are symmetrically provided with L-shaped guide rods (132), a lifting plate (133) is in sliding fit between the vertical sections of the two L-shaped guide rods (132), the top of each side extension plate (131) is in threaded connection with an adjusting screw (134), the bottom end of each adjusting screw (134) penetrates through the bottom end of each side extension plate (131) and is connected with the top of each lifting plate (133) through a bearing, one end, far away from the universal wheel (12), of the bottom of each lifting plate (133) is fixedly connected with a round rod (135), and the bottom end of each round rod (135) is fixedly connected with a pressing plate (136);

a folding mechanism (20) is arranged between the two clip-shaped frames (10), the folding mechanism (20) comprises lifting blocks (21) which are in sliding fit in the lifting groove (101), a first screw rod (211) is screwed in the two adjacent threaded holes (102), the first screw rod (211) is positioned at the upper end and the lower end of each lifting block (21), fixing plates (22) are fixedly connected to the opposite sides of the two lifting blocks (21) which are symmetrical front and back, a circular shaft (221) is arranged between the two fixing plates (22) which are symmetrical front and back, the two fixing plates (22) which are symmetrical left and right are connected through a telescopic rod (222), clip-shaped flat plates (23) are movably sleeved on the outer walls of the circular shafts (221), perforated plates (24) are symmetrically arranged at the upper ends and the lower ends of the two clip-shaped flat plates (23) and at the connection positions of the two clip-shaped flat plates (23), two perforated plates (24) are symmetrically arranged front and back, mounting holes are formed at the upper ends and the lower ends of the clip-shaped flat plates (23) corresponding to the holes on the perforated plates (24), a second bolt (25) penetrates through holes of the pore plates (24) which are symmetrical up and down, and the bottom end of the second bolt (25) is fixedly connected with the square-square flat plate (23) through a nut.

2. An improved lifting scaffold according to claim 1 wherein: the bottom of clamp plate (136) is provided with a plurality of protruding pieces, and the protruding piece on left side all is along the linear evenly distributed of the length direction of clamp plate (136), and the protruding piece on right side all is along the linear evenly distributed of the width direction of clamp plate (136).

3. An improved lifting scaffold according to claim 1 wherein: one end of the bottom of the lifting plate (133) close to the universal wheel (12) is provided with two mounting frames (137), the front side and the rear side of the left mounting frame (137) are symmetrically provided with two, the left side and the right side of the right mounting frame (137) are symmetrically provided with two, and the two mounting frames (137) are rotatably connected with a round roller (138).

4. An improved lifting scaffold according to claim 1 wherein: the top center of the clip-shaped frame (10) is provided with a shelf (14).

5. An improved lifting scaffold according to claim 1 wherein: the front end welding at time type frame (10) top has L type frame (15), and the front end of the vertical section of L type frame (15) is provided with multiunit pole-climbing (16), and pole-climbing (16) are along the direction of height evenly distributed of the vertical section of L type frame (15).

6. An improved lifting scaffold according to claim 1 wherein: the side wall of fixed plate (22) is provided with supporting mechanism (26), supporting mechanism (26) are including rotating L type extension board (261) of connecting in fixed plate (22) and keeping away from orifice plate (24) one end, L type extension board (261) is provided with two from top to bottom symmetrically, the width of L type extension board (261) equals with the width of fixed plate (22), the opposite side of two horizontal segments of L type extension board (261) contacts with the upper and lower both ends of returning type dull and stereotyped (23) respectively, fixed plate (22) are close to the one end of L type extension board (261) and are located the position of L type extension board (261) below and have seted up No. one T type groove (262), the inside sliding fit of No. one T type groove (262) has i-shaped slide (263).

7. An improved lifting scaffold according to claim 1 wherein: two the looks of returning type frame (10) back of the body side all is provided with elevating system (27), elevating system (27) are including setting up at the vertical section bottom of returning type frame (10) and being close to overhanging plate (271) of climbing pole (16) one side, it is connected with the rolling axle to rotate between two overhanging plate (271), the fixed cover of outer wall of rolling axle is equipped with wind-up roll (272), both ends symmetry rolling has wire rope (273) around wind-up roll (272) outer wall, the end of two wire rope (273) passes two round holes (103) respectively and is connected with the top of two fixed plates (22) respectively, the rear end of wind-up axle runs through the rear end of overhanging plate (271) and fixed cover is equipped with plectane (274), the outer wall of plectane (274) extends its circumference evenly distributed has multiunit bull stick (275).

8. An improved lifting scaffold according to claim 7 wherein: a second T-shaped groove (276) is formed in the center of the rear end of the extending plate (271) on the rear side, a T-shaped sliding block (277) is in sliding butt joint with the inside of the second T-shaped groove (276), and an Contraband-shaped clamping plate (278) is fixedly connected to the rear end of the T-shaped sliding block (277).

Background

The scaffold is a temporary building tool which is erected for workers to operate and solve vertical and horizontal transportation on a construction site, and is mainly used for outer walls, interior decoration or places with higher floor height and incapable of being directly constructed. The scaffold can be divided into the following steps according to the scaffold erection method: floor type scaffold, overhanging type scaffold, hanging type scaffold and lifting type scaffold, lifting type scaffold is the scaffold fully taken along the outer surface of the structure, and can be gradually lifted along with the structure construction through mutual supporting and mutual lifting between scaffold members or between scaffold and wall body.

With the development of science and technology, the lifting scaffold is also continuously improved, but most of the improved lifting scaffolds still have the following problems: 1. most of improved lifting scaffolds need to be transported to a construction site for assembly and combination, and need to be manually and repeatedly assembled and disassembled, so that the preparation time before construction is long, and time and labor are wasted; 2. most improved generation over-and-under type scaffold can set up universal wheel and button mechanism in the bottom, and the scaffold of being convenient for can be easily moved and fixed, but button mechanism only need upwards or break down with the fingers and thumb downwards and can lock and the unblock the universal wheel, takes place to remove easily under the collision for the scaffold position is unstable, arouses personnel's potential safety hazard and construction position easily, and factor of safety is low.

Therefore, the invention provides an improved lifting scaffold.

Disclosure of Invention

In order to achieve the purpose, the invention provides an improved lifting scaffold, which comprises a square-shaped frame and two levers, wherein the square-shaped frame is arranged in a bilateral symmetry mode, the two levers are hinged to the front ends of the two square-shaped frames in a crossed mode, the two levers are connected in a hinged mode, the two levers are symmetrically arranged in two groups in the front and at the back, the left end of the square-shaped frame is in a square-shaped structure, the opposite sides of the vertical section of the square-shaped frame are provided with lifting grooves, the side wall of the vertical section of the square-shaped frame is provided with a plurality of threaded holes, the threaded holes are arranged at equal intervals along the height direction of the square-shaped frame, the front end and the back end of the top of the horizontal section above the square-shaped frame are symmetrically provided with round holes, and the front end and the back end of the bottom of the square-shaped frame are symmetrically provided with universal wheels;

the back sides of the horizontal sections below the two square frames are provided with two positioning mechanisms, the front and back of each positioning mechanism are symmetrically provided with two positioning mechanisms, each positioning mechanism comprises a side extension plate arranged on the side wall of the square frame, the front and back ends of the bottom of each side extension plate are symmetrically provided with L-shaped guide rods, a lifting plate is in sliding fit between the vertical sections of the two L-shaped guide rods, the top of each side extension plate is in threaded connection with an adjusting screw rod, the bottom end of each adjusting screw rod penetrates through the bottom end of each side extension plate and is connected with the top of the lifting plate through a bearing, one end of the bottom of each lifting plate, which is far away from the universal wheel, is fixedly connected with a round rod, and the bottom end of each round rod is fixedly connected with a pressing plate;

a folding device is arranged between the two clip-shaped frames, the folding device comprises lifting blocks which are in sliding fit in the lifting grooves, a first screw rod is screwed in the inner parts of two adjacent threaded holes, the first screw rod is positioned at the upper end and the lower end of the lifting blocks, fixed plates are fixedly connected with the opposite sides of the two lifting blocks which are symmetrical front and back, a round shaft is arranged between the two fixed plates which are symmetrical front and back, the two fixed plates which are symmetrical left and right are connected through a telescopic rod, a clip-shaped flat plate is movably sleeved on the outer wall of the round shaft, and pore plates are symmetrically arranged at the upper end and the lower end of the two clip-shaped flat plates and positioned at the joint of the two clip-shaped flat plates, and the orifice plate symmetry sets up two around, and the upper and lower both ends of the dull and stereotyped position that corresponds the orifice plate upper hole of returning has seted up the mounting hole, and the orifice plate downthehole of symmetry about going up wears to be equipped with No. two bolts jointly, and No. two bolts's bottom is passed through the nut and is returned dull and stereotyped fixed connection.

Preferably, the bottom of clamp plate is provided with a plurality of protruding pieces, and the protruding piece on left side all is along the length direction evenly distributed of clamp plate, and the protruding piece on right side all is along the width direction evenly distributed of clamp plate.

Preferably, the one end that the lifter plate bottom is close to the universal wheel is provided with the mounting bracket, and left mounting bracket longitudinal symmetry is provided with two, and the mounting bracket bilateral symmetry on right side is provided with two, rotates between two mounting brackets and is connected with the round roller.

Preferably, a rack is arranged at the center of the top of the clip-shaped frame.

Preferably, the front end welding at type frame top returns has L type frame, and the front end of the vertical section of L type frame is provided with the multiunit pole of climbing, climbs the direction of height evenly distributed of pole along the vertical section of L type frame.

Preferably, the side wall of the fixed plate is provided with a supporting mechanism, the supporting mechanism comprises two L-shaped support plates which are rotatably connected to one end, far away from the pore plate, of the fixed plate, the two L-shaped support plates are arranged symmetrically up and down, the width of each L-shaped support plate is equal to that of the fixed plate, the opposite sides of the two horizontal sections of each L-shaped support plate are respectively contacted with the upper end and the lower end of the corresponding bent flat plate, a first T-shaped groove is formed in the position, close to one end of each L-shaped support plate and below the corresponding L-shaped support plate, of the fixed plate, and an I-shaped sliding plate is arranged inside each T-shaped groove in a sliding fit mode.

Preferably, two the looks dorsal part of returning the type frame all is provided with elevating system, elevating system is including setting up returning the vertical section bottom of type frame and being close to the overhanging plate of climbing pole one side, rotate between two overhanging plates and be connected with the rolling axle, the fixed cover of outer wall of rolling axle is equipped with the wind-up roll, both ends symmetry rolling around the wind-up roll outer wall has wire rope, two wire rope's end passes two round holes respectively and is connected with the top of two fixed plates respectively, the rear end that the rear end of wind-up axle runs through overhanging plate is fixed the cover and is equipped with the plectane, the outer wall of plectane prolongs its circumference evenly distributed and has the multiunit bull stick.

Preferably, the rear end center of the rear side overhanging plate is provided with a second T-shaped groove, a T-shaped sliding block is in sliding butt joint with the inside of the second T-shaped groove, and the rear end of the T-shaped sliding block is fixedly connected with an Contraband-shaped clamping plate.

Advantageous effects

1. According to the invention, the two clip-shaped frames can move relatively or oppositely through the matching between the clip-shaped frames and the lever, so that the distance between the two clip-shaped frames can be adjusted, the two clip-shaped flat plates can be folded through the matching between the circular shaft, the clip-shaped flat plates, the pore plates and the second bolt, the width of the clip-shaped flat plates can be conveniently adjusted in a limited construction space, convenience is provided for the transportation of the improved lifting scaffold, and the occupied area of the improved lifting scaffold when the improved lifting scaffold is idle can be reduced;

2. according to the improved lifting scaffold, multiple friction forces can be added to the ground through the left and right asymmetrically arranged convex blocks and the round rollers, so that the positions of the universal wheels are locked and fixed, the operation is simple and convenient, the locking force is strong, the stability of the improved lifting scaffold is higher, the improved lifting scaffold is not easy to move under collision, and the safety of constructors and the construction positions are ensured;

3. according to the invention, the steel wire rope is wound or unwound by the winding roller, so that the return type flat plate can be lifted, the construction condition of manual movement is improved, and more construction operation ranges are provided.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is an enlarged schematic view of area A of FIG. 1 in accordance with the present invention;

FIG. 3 is an enlarged schematic view of area B of FIG. 1 in accordance with the present invention;

FIG. 4 is a front view of the present invention;

FIG. 5 is a perspective view of the paperclip and the support mechanism of the present invention;

FIG. 6 is a front view of the plate and well plate of the present invention;

FIG. 7 is a cross-sectional view of the clip plate and retaining plate of the present invention;

FIG. 8 is a top view of the present invention;

FIG. 9 is a perspective view of the frame, the fixing plate and the lifting mechanism of the present invention;

FIG. 10 is an enlarged view of region C of FIG. 9 according to the present invention

FIG. 11 is a perspective view of a T-shaped slider and an Contraband-shaped card board of the present invention.

In the figure: 10. a clip frame; 101. a lifting groove; 102. a threaded hole; 103. a circular hole; 11. a lever; 12. a universal wheel; 13. a positioning mechanism; 131. a side extension plate; 132. an L-shaped guide rod; 133. a lifting plate; 134. adjusting the screw rod; 135. a round bar; 136. pressing a plate; 137. a mounting frame; 138. a round roller; 14. a storage plate; 15. an L-shaped frame; 16. climbing a pole; 20. a folding device; 21. a lifting block; 211. a first bolt; 22. a fixing plate; 221. a circular shaft; 222. a telescopic rod; 23. a clip-shaped flat plate; 24. an orifice plate; 25. a second bolt; 26. a support mechanism; 261. an L-shaped support plate; 262. a first T-shaped groove; 263. an i-shaped slide plate; 27. a lifting mechanism; 271. an overhang plate; 272. a wind-up roll; 273. a wire rope; 274. a circular plate; 275. a rotating rod; 276. a second T-shaped groove; 277. a T-shaped slider; 278. model Contraband cardboard.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

Referring to fig. 1, 8 and 9, an improved lifting scaffold comprises a clip frame 10 and two levers 11 which are symmetrically arranged left and right and are hinged at the front ends of the two clip frames 10 in a crossed manner, the two levers 11 are connected with each other in a hinged manner, the two levers 11 are symmetrically arranged in two groups in front and back, the left end of the clip frame 10 is in a clip structure, the opposite sides of the vertical section of the clip frame 10 are provided with lifting grooves 101, the side wall of the vertical section of the clip frame 10 is provided with a plurality of threaded holes 102, the threaded holes 102 are arranged at equal intervals along the height direction of the clip frame 10, the lifting grooves 101 are communicated with the threaded holes 102, the front end and the back end of the top of the horizontal section above the clip frame 10 are symmetrically provided with round holes 103, and the front end and the back end of the bottom of the clip frame 10 are symmetrically provided with universal wheels 12;

referring to fig. 1, 2 and 3, the positioning mechanisms 13 are disposed on the back sides of the horizontal sections below the two rectangular frames 10, two positioning mechanisms 13 are symmetrically disposed in the front and back directions, the positioning mechanisms 13 include side extension plates 131 disposed on the side walls of the rectangular frames 10, L-shaped guide rods 132 are symmetrically disposed on the front and back ends of the bottoms of the side extension plates 131, a lifting plate 133 is slidably fitted between the vertical sections of the two L-shaped guide rods 132 and above the horizontal sections of the L-shaped guide rods 132, an adjusting screw 134 is threadedly connected to the top of the side extension plate 131, the bottom end of the adjusting screw 134 penetrates through the bottom end of the side extension plate 131 and is connected to the top of the lifting plate 133 through a bearing, a round rod 135 is fixedly connected to the bottom end of the lifting plate 133 far from the universal wheel 12, a pressing plate 136 is fixedly connected to the bottom end of the round rod 135, a plurality of protruding blocks are disposed at the bottom end of the pressing plate 136, and the protruding blocks on the left side are uniformly distributed along the length direction of the pressing plate 136, the right protruding blocks are uniformly distributed along the width direction of the pressing plate 136, one end of the bottom of the lifting plate 133, which is close to the universal wheel 12, is provided with two mounting frames 137, the left mounting frame 137 is symmetrically arranged in front and back, the right mounting frame 137 is symmetrically arranged in left and right, a round roller 138 is rotatably connected between the two mounting frames 137, and the bottom ends of the protruding blocks are flush with the bottom ends of the round rollers 138;

referring to fig. 1, 4, 8 and 9, a shelf 14 is disposed at the center of the top of the clip frame 10 and between two circular holes 103, so as to facilitate placement of construction articles, an L-shaped frame 15 is welded at the front end of the top of the clip frame 10, a space exists between the vertical section of the L-shaped frame 15 and the clip frame 10, a plurality of groups of climbing rods 16 are disposed at the front end of the vertical section of the L-shaped frame 15, and the climbing rods 16 are uniformly distributed along the height direction of the vertical section of the L-shaped frame 15;

referring to fig. 4, 5, 6 and 8, a folding device 20 is disposed between two rectangular frames 10, the folding device 20 includes a lifting block 21 slidably fitted in the lifting groove 101, a first screw 211 is screwed in the two adjacent threaded holes 102, the first screw 211 is disposed at the upper and lower ends of the lifting block 21, the opposite sides of the two symmetrical lifting blocks 21 are fixedly connected with a fixing plate 22, a circular shaft 221 is disposed between the two symmetrical fixing plates 22, the two symmetrical fixing plates 22 are connected by a telescopic rod 222, a rectangular flat plate 23 is movably sleeved on the outer wall of the circular shaft 221 and between the two symmetrical fixing plates 22, two rectangular flat plates 24 are symmetrically disposed at the upper and lower ends of the two rectangular flat plates 23 and at the connection position of the two rectangular flat plates 23, two rectangular flat plates 24 are symmetrically disposed at the front and rear ends of the rectangular flat plates 23, mounting holes are disposed at positions corresponding to the holes on the rectangular flat plates 24 at the upper and lower ends of the rectangular flat plates 23, a second bolt 25 is arranged in the holes of the pore plates 24 which are symmetrical up and down in a penetrating way, and the bottom end of the second bolt 25 is fixedly connected with the square-square flat plate 23 through a nut;

referring to fig. 4, 5, 7 and 8, a supporting mechanism 26 is disposed on a side wall of the fixing plate 22, the supporting mechanism 26 includes an L-shaped support plate 261 rotatably connected to one end of the fixing plate 22 far from the orifice plate 24, two L-shaped support plates 261 are symmetrically disposed up and down, the width of the L-shaped support plate 261 is equal to that of the fixing plate 22, opposite sides of two horizontal sections of the L-shaped support plate 261 are respectively contacted with upper and lower ends of the square-type flat plate 23, one end of a vertical section of the L-shaped support plate 261 is in an arc-shaped structure, a first T-shaped groove 262 is disposed at a position, close to one end of the L-shaped support plate 261, below the L-shaped support plate 261, an i-shaped sliding plate 263 is slidably fitted inside the first T-shaped groove 262, and the i-shaped sliding plate 263 plays a role in supporting and limiting for the bottom of the L-shaped support plate 261 and places the L-shaped support plate 261 to rotate downwards;

referring to fig. 8, 9, 10 and 11, the lifting mechanism 27 is disposed on the opposite back sides of the two clip frames 10, the lifting mechanism 27 includes an outward extending plate 271 disposed at the bottom end of the vertical section of the clip frame 10 and close to one side of the climbing rod 16, a winding shaft is rotatably connected between the two outward extending plates 271, a winding roller 272 is fixedly sleeved on the outer wall of the winding shaft, steel cables 273 are symmetrically wound on the front and back ends of the outer wall of the winding roller 272, the ends of the two steel cables 273 respectively pass through the two circular holes 103 and are respectively connected with the tops of the two fixing plates 22, a circular plate 274 is fixedly sleeved on the rear end of the winding shaft and penetrates through the rear end of the outward extending plate 271, a plurality of sets of rotating rods 275 are uniformly distributed on the outer wall of the circular plate 274 along the circumferential direction, a second T-shaped groove 276 is formed in the center of the rear end of the rear outward extending plate 271, a T-shaped slider 277 is slidably abutted to the inside of the second T-shaped groove 276, a T-shaped slider 277, a Contraband-shaped clamping plate 278 is fixedly connected to the rear end of the T-shaped slider 277, the spacing between the two horizontal segments of the Contraband-type catch plate 278 is equal to the diameter of the rotating rod 275.

The working principle is as follows: the method comprises the following steps that a clip-shaped frame 10 is pushed to a position to be constructed, two clip-shaped frames 10 are pulled to move oppositely or oppositely, at the moment, levers 11 are driven by the clip-shaped frame 10 to rotate, when the two levers 11 are close to each other and gradually positioned in a vertical state, the two clip-shaped frames 10 move oppositely, and when the two levers 11 are far away from each other and gradually positioned in a horizontal state, the two clip-shaped frames 10 move oppositely, so that the distance between the two clip-shaped frames 10 can be adjusted;

after the width between the two square-shaped frames 10 is adjusted, the adjusting screw 134 is rotated to rotate and move downwards, the lifting plate 133 synchronously moves downwards under the screw driving of the adjusting screw 134 and the guiding action of the L-shaped guide rod 132, the lifting plate 133 drives the round rod 135, the pressing plate 136 and the round roller 138 to synchronously move downwards to the ground, various friction forces can be added to the ground through the left and right asymmetrically arranged convex blocks and the round roller 138, and then the position of the universal wheel 12 is locked and fixed, the operation is simple and convenient, the locking force is strong, the improved lifting scaffold is higher in stability and is not easy to move easily under collision, and the safety of constructors and the construction position are ensured;

when the height of the clip-type flat plate 23 needs to be adjusted, the first screw 211 is screwed out from the threaded hole 102, the i-shaped sliding plate 263 moves towards the inside of the first T-shaped groove 262, at this time, the i-shaped sliding plate 263 does not contact with the L-shaped support plate 261, the L-shaped support plate 261 can be rotated to a vertical state, at this time, the L-shaped support plate 261 does not clamp and support the upper and lower ends of the clip-type flat plate 23, the Contraband-type clamping plate 278 is pushed towards the direction of the clip-type frame 10, at this time, the Contraband-type clamping plate 278 drives the T-shaped slider 277 to move along the second T-shaped groove 276, the Contraband-type clamping plate 278 gradually gets away from the rotating rod 275, at this time, the circular plate 274 is rotated, the circular plate 274 drives the coaxially connected winding roller 272 to rotate together, the winding roller 272 winds or unwinds the steel wire rope 273, the fixed plate 22 drives the lifting block 21 to reciprocate up and down along the lifting groove 101 under the drive of the steel wire rope 273, the fixed plate 22 drives the circular shaft 221 to move together with the clip-type flat plate 23, the clip plate 23 is lifted, the construction condition of manual movement is improved, more construction operation ranges are provided, after the height of the clip plate 23 is adjusted, the first screw 211 is screwed into the corresponding threaded hole 102, the Contraband type clip plate 278 is pushed towards the direction of the rotating rod 275, at the moment, the Contraband type clip plate 278 drives the T-shaped slider 277 to move along the second T-shaped groove 276, one rotating rod 275 is inserted between two horizontal sections of the Contraband type clip plate 278, at the moment, the position of the circular plate 274 is locked, and therefore the circular plate 274 cannot rotate;

when the improved lifting scaffold is not used, the I-shaped sliding plate 263 moves towards the inside of the first T-shaped groove 262, the I-shaped sliding plate 263 is not in contact with the L-shaped support plate 261, the L-shaped support plate 261 can be rotated to be in a vertical state, the L-shaped support plate 261 does not clamp and support the upper end and the lower end of the reverse type flat plate 23, the second bolt 25 is detached, the two reverse type flat plates 23 are in a separated state, the reverse type flat plate 23 is rotated to be in a vertical section state around the circular shaft 221 and is erected at the bottom end of the inner wall of the reverse type frame 10, the two reverse type frames 10 move oppositely, the telescopic rod 222 is gradually contracted, the two reverse type flat plates 23 can be folded, and the width of the reverse type flat plates 23 can be conveniently adjusted by the two reverse type frames 10.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.