1. A tight bundle machinery based on ratchet and chain structure which characterized in that: the chain conveying device comprises a base (1) and a chain (17), wherein the base (1) comprises a horizontally arranged bottom plate (101) and a left vertical plate (102) and a right vertical plate (102) which are vertically and fixedly arranged on the bottom plate (101), a chain channel for the chain (17) to pass through is formed between the two vertical plates (102), the chain channel is of a front-back communication structure, the rear part of the chain channel is a chain inlet of the chain (17), and the front part of the chain channel is a chain outlet of the chain (17);

a ratchet mechanism is arranged between the two vertical plates (102), and the ratchet mechanism is positioned in the chain channel;

the ratchet mechanism comprises a chain wheel mechanism and a pawl mechanism; the chain wheel mechanism comprises shaft rods (2) rotatably arranged on two vertical plates (102) and chain wheels (3) fixedly arranged on the shaft rods (2), the central axes of the shaft rods (2) are parallel to the bottom plate (101), and the shaft rods (2) are of rod-shaped structures horizontally extending left and right;

the shaft lever (2) is provided with a tightening handle (4) for driving the chain wheel mechanism to rotate;

the pawl mechanism is rotationally arranged on the vertical plate (102), is matched with the chain wheel (3) to limit the anticlockwise rotational motion of the chain wheel (3), and can be separated from the chain wheel (3) under the action of external force;

one end of the chain (17) is hinged with a vertical plate (102) at the chain outlet; the other end of the chain (17) is wound around the lower part of the base (1) and enters a chain channel through a chain inlet, the chain (17) passes through a gap between the chain wheel (3) and the bottom plate (101) in the chain channel and is meshed with the lower part of the chain wheel (3), and then the chain passes out of a chain outlet; the chain (17) forms a ferrule for tightly binding the steel tube after one round of winding.

2. The binding machine based on the ratchet and chain structure as claimed in claim 1, wherein: the pawl mechanism comprises a non-return pawl mechanism arranged between two vertical plates (102), and the non-return pawl mechanism is positioned in front of the chain wheel (3);

the check pawl mechanism comprises a first pin shaft (8), a triangular plate (9), a second cylinder (10) and a unbounded handle (12); the first pin shaft (8) penetrates through the two vertical plates (102), the first pin shaft (8) is parallel to the shaft lever (2), a first pin hole is formed in the lower end of the triangular plate (9), the first pin shaft (8) penetrates through the first pin hole, friction force exists between the triangular plate (9) and the first pin shaft (8), and the triangular plate (9) can rotate relative to the first pin shaft (8) under the action of external force;

a second cylinder (10) horizontally extending towards the left and right direction is fixedly arranged at the rear end of the triangular plate (9), the second cylinder (10) is parallel to the shaft rod (2), and the diameter of the second cylinder (10) is the same as that of a semicircle formed by tooth grooves of the chain wheel (3);

a cross rod (11) extending horizontally in the left-right direction is welded at the upper end of the triangular plate (9), the left end and the right end of the cross rod (11) are respectively fixedly connected with one end of a beam splitting handle (12) of the frame-shaped rod structure, the beam splitting handle (12) is positioned on the outer side of the chain wheel (3), and one end, far away from the cross rod (11), of the beam splitting handle (12) extends backwards to the rear of the vertical plate (102);

when the beam releasing handle (12) is pressed downwards clockwise to rotate, the beam releasing handle (12) drives the triangular plate (9) to rotate around the first pin shaft (8), and the second cylinder (10) at the rear end of the triangular plate (9) falls into one tooth groove in the front part of the chain wheel (3), the beam releasing handle (12) is positioned on the shaft lever (2), and at the moment, the shaft lever (2) can block the downward movement of the beam releasing handle (12) so as to limit the anticlockwise rotary movement of the chain wheel (3).

3. The binding machine based on the ratchet and chain structure as claimed in claim 2, wherein: a stopping component is arranged below the triangular plate (9) and is fixedly connected with the vertical plate (102); the first pin shaft (8) is sleeved with a torsion spring (20) which prevents the unbinding handle (12) from automatically falling after being lifted, the torsion spring (20) comprises two elastic rods which respectively extend upwards and downwards, the elastic rod which extends downwards abuts against the rear side of the stopping component, and the elastic rod which extends upwards abuts against the rear side of the cross rod (11);

when the second cylinder (10) falls into one of the tooth grooves in the front of the chain wheel (3), the torsion spring (20) is in a compressed state.

4. A binding machine based on a ratchet and chain arrangement as claimed in claim 2 or 3, wherein: the bundle loosening handle (12) and the cross rod (11) are both positioned between the two vertical plates (102).

5. A binding machine based on a ratchet and chain arrangement as claimed in claim 2 or 3, wherein: the left end and the right end of the cross rod (11) respectively extend to the outer sides of the two vertical plates (102), and the bundle loosening handle (12) is positioned on the outer sides of the two vertical plates (102); the front parts of the two vertical plates (102) are provided with downward slopes for avoiding the track of the transverse rod (11) doing anticlockwise arc motion around the first pin shaft (8).

6. A binding machine based on a ratchet and chain arrangement as claimed in any one of claims 1 to 3, characterized in that: the tightening handle (4) comprises a pressing rod (401) extending in the vertical direction and a U-shaped frame plate (402) fixedly arranged at the lower end of the pressing rod (401), and the U-shaped frame plate (402) is of a U-shaped plate structure with a lower opening; the U-shaped frame plate (402) comprises two left vertical panels and two right vertical panels, wherein the two vertical panels are respectively provided with a left through second shaft hole (403) and a right through second shaft hole (403), the shaft rod (2) penetrates through the second shaft holes (403), the U-shaped frame plate (402) is rotatably arranged on the shaft rod (2) through the second shaft holes (403), and the U-shaped frame plate (402) is positioned between the two vertical plates (102);

the tight-binding handle (4) further comprises an active pawl mechanism, the active pawl mechanism comprises a first pin shaft (5), a swing rod (6) and a first cylinder (7), the first pin shaft (5) penetrates through two vertical panels of the U-shaped frame plate (402), the first pin shaft (5) is parallel to the shaft lever (2), and the first pin shaft (5) is positioned above the chain wheel (3);

the whole of the swing rod (6) is of a structure extending obliquely and backwardly, a left through third pin hole and a right through third pin hole are formed in the upper portion of the swing rod (6), the first pin shaft (5) penetrates through the third pin hole, the swing rod (6) is rotatably arranged on the first pin shaft (5) through the third pin hole, and the swing rod (6) can do circular motion in a vertical interface around the first pin shaft (5);

the lower end of the swing rod (6) is fixedly connected with the middle of the first cylinder (7), the first cylinder (7) is of a rod-shaped structure extending horizontally in the left-right direction, the diameter of the first cylinder (7) is the same as that of a semicircle formed by tooth grooves of the chain wheel (3), the first cylinder (7) is movably arranged in one of the tooth grooves at the rear upper part of the chain wheel (3), and when the swing rod (6) is stirred by external force to rotate anticlockwise, the first cylinder (7) can be separated from the chain wheel (3).

7. A binding machine based on a ratchet and chain arrangement as claimed in any one of claims 1 to 3, characterized in that: the base (1) is provided with a chain guide structure for guiding the movement of the chain (17); the chain guide structure comprises a second guide plate (15) and a third guide plate (16) which are arranged in front of the chain wheel (3);

the second guide plate (15) is of an inverted 7-shaped plate structure, the second guide plate (15) is fixedly arranged on the bottom plate (101), the inclined surface of the second guide plate (15) faces upwards, and the maximum vertical height of the second guide plate (15) is higher than the height of the end part of a chain (17) hinged with the vertical plate (102);

the third guide plate (16) is positioned above the second guide plate (15), the third guide plate (16) is of a plate-shaped structure extending obliquely downwards, the third guide plate (16) is fixedly arranged on the vertical plate (102), the third guide plate (16) is vertical to the vertical plate (102), and the third guide plate (16) is positioned below the triangular plate (9);

a chain outlet of the chain channel is formed between the second guide plate (15) and the third guide plate (16).

8. The binding machine based on the ratchet and chain structure as claimed in claim 6, wherein: the chain guide structure comprises a first guide plate (14), the first guide plate (14) is of an inverted 7-shaped plate structure, the first guide plate (14) is fixedly arranged on the bottom plate (101), the first guide plate (14) is positioned behind and below the chain wheel (3), and the first guide plate (14) is positioned at the position of a chain inlet of the chain channel; when the chain (17) reaches the highest point along the slope of the first guide plate (14), the chain (17) starts to engage with the sprocket (3).

Background

When steel pipes of engineering projects are returned, steel pipe classification sleeve steel wire rings need to be bundled by lease contract agreement, the steel pipes are difficult to stack into round stacks when stacked, and the steel wire rings are difficult to sleeve. However, the steel pipe bundling method occupies a plurality of hoisting times of the tower crane and has long time, so that other construction production is influenced, and the steel pipe bundling cost is increased.

Disclosure of Invention

The invention provides a tightening machine based on a ratchet wheel and a chain structure, and aims to solve the problem that other construction production is influenced because a tower crane is required to assist when steel pipes are tied up on a construction site in the prior art.

The technical scheme of the invention is as follows: a tightening machine based on a ratchet wheel and chain structure comprises a base and a chain, wherein the base comprises a horizontally arranged bottom plate and a left vertical plate and a right vertical plate which are vertically and fixedly arranged on the bottom plate, a chain passage for the chain to pass through is formed between the two vertical plates, the chain passage is of a front-back communication structure, the rear part of the chain passage is a chain inlet of the chain, and the front part of the chain passage is a chain outlet of the chain;

a ratchet mechanism is arranged between the two vertical plates and is positioned in the chain channel;

the ratchet mechanism comprises a chain wheel mechanism and a pawl mechanism; the chain wheel mechanism comprises shaft rods which are rotatably arranged on the two vertical plates and chain wheels which are fixedly arranged on the shaft rods, the central axes of the shaft rods are parallel to the bottom plate, and the shaft rods are of rod-shaped structures which horizontally extend along the left and right sides;

the shaft lever is provided with a tightening handle for driving the chain wheel mechanism to rotate;

the pawl mechanism is rotatably arranged on the vertical plate, is matched with the chain wheel to limit the anticlockwise rotating motion of the chain wheel, and can be separated from the chain wheel under the action of external force;

one end of the chain is hinged with a vertical plate at the outlet of the chain; the other end of the chain passes by the lower part of the base and enters the chain channel through the chain inlet, the chain passes through the gap between the chain wheel and the bottom plate in the chain channel and is meshed with the lower part of the chain wheel, and then the chain passes out of the chain outlet; the chain forms a ferrule for tightly binding the steel pipe after winding for one circle.

Preferably, the pawl mechanism comprises a non-return pawl mechanism arranged between the two vertical plates, and the non-return pawl mechanism is positioned in front of the chain wheel;

the non-return pawl mechanism comprises a first pin shaft, a triangular plate, a second cylinder and a unbinding handle; the first pin shaft penetrates through the two vertical plates, the first pin shaft and the shaft lever are parallel to each other, a first pin hole is formed in the lower end of the triangular plate, the first pin shaft penetrates through the first pin hole, friction force exists between the triangular plate and the first pin shaft, and the triangular plate can rotate relative to the first pin shaft under the action of external force;

the rear end of the triangular plate is fixedly provided with a second cylinder which horizontally extends towards the left and right direction, the second cylinder is parallel to the shaft lever, and the diameter of the second cylinder is the same as that of a semicircle formed by tooth grooves of the chain wheel;

a cross rod horizontally extending towards the left and right directions is welded at the upper end of the triangular plate, the left end and the right end of the cross rod are respectively fixedly connected with one end of a beam releasing handle of the frame-shaped rod structure, the beam releasing handle is positioned on the outer side of the chain wheel, and one end, far away from the cross rod, of the beam releasing handle extends backwards to the rear of the vertical plate;

when the unbinding handle is pressed downwards clockwise to rotate, the unbound handle drives the triangular plate to rotate around the first pin shaft, and when the second cylinder at the rear end of the triangular plate falls into one of the tooth grooves in the front of the chain wheel, the unbound handle is positioned on the shaft rod, and the shaft rod can stop the downward movement of the unbound handle so as to limit the anticlockwise rotary movement of the chain wheel.

Preferably, a stopping component is arranged below the triangular plate and fixedly connected with the vertical plate; the first pin shaft is sleeved with a torsion spring for preventing the unbinding handle from automatically falling after being lifted, the torsion spring comprises two elastic rods which respectively extend upwards and downwards, the elastic rod which extends downwards abuts against the rear side of the stop component, and the elastic rod which extends upwards abuts against the rear side of the cross rod;

when the second cylinder falls into one of the tooth grooves in the front of the chain wheel, the torsion spring is in a compressed state.

Preferably, the unbinding handle and the cross bar are both positioned between the two vertical plates.

Preferably, the left end and the right end of the cross rod respectively extend to the outer sides of the two vertical plates, and the unbinding handle is positioned on the outer sides of the two vertical plates; the front parts of the two vertical plates are provided with downward slopes for avoiding the track of the transverse rod doing anticlockwise arc-shaped motion around the first pin shaft.

Preferably, the tightening handle comprises a pressing rod extending in the vertical direction and a U-shaped frame plate fixedly arranged at the lower end of the pressing rod, and the U-shaped frame plate is of a U-shaped plate structure with a lower opening; the U-shaped frame plate comprises two left vertical panels and two right vertical panels, wherein the two vertical panels are respectively provided with a left through second shaft hole and a right through second shaft hole, the shaft lever penetrates through the second shaft holes, the U-shaped frame plate is rotatably arranged on the shaft lever through the second shaft holes, and the U-shaped frame plate is positioned between the two vertical plates;

the tightening handle further comprises a driving pawl mechanism, the driving pawl mechanism comprises a first pin shaft, a swing rod and a first cylinder, the first pin shaft is arranged on the two vertical panels of the U-shaped frame plate in a penetrating mode, the first pin shaft is parallel to the shaft rod, and the first pin shaft is located above the chain wheel;

the whole swing rod is of a structure extending obliquely and backwardly, a left through third pin hole and a right through third pin hole are formed in the upper portion of the swing rod, the first pin shaft penetrates through the third pin holes, the swing rod is rotatably arranged on the first pin shaft through the third pin holes, and the swing rod can do circular motion in a vertical interface around the first pin shaft;

the lower end of the swing rod is fixedly connected with the middle of the first cylinder, the first cylinder is of a rod-shaped structure extending horizontally in the left-right direction, the diameter of the first cylinder is the same as that of a semicircle formed by tooth grooves of the chain wheel, the first cylinder is movably arranged in one of the tooth grooves at the rear upper part of the chain wheel, and when the swing rod is stirred by external force to rotate anticlockwise, the first cylinder can be separated from the chain wheel.

Preferably, the base is provided with a chain guide structure for guiding the movement of the chain; the chain guide structure comprises a second guide plate and a third guide plate which are arranged in front of the chain wheel;

the second guide plate is of an inverted-character-shaped plate-shaped structure, the second guide plate is fixedly arranged on the bottom plate, the inclined surface of the second guide plate faces upwards, and the maximum vertical height of the second guide plate is higher than the height of the end part of the chain hinged with the vertical plate;

the third guide plate is positioned above the second guide plate, the third guide plate is of a plate-shaped structure extending obliquely downwards, the third guide plate is fixedly arranged on the vertical plate, the third guide plate is vertical to the vertical plate, and the third guide plate is positioned below the triangular plate;

a chain outlet of the chain channel is formed between the second guide plate and the third guide plate.

Preferably, the chain guide structure comprises a first guide plate, the first guide plate is of an inverted-letter-shaped plate structure, the first guide plate is fixedly arranged on the bottom plate, the first guide plate is positioned behind and below the chain wheel, and the first guide plate is positioned at a chain inlet of the chain channel; when the chain peaks along the incline of the first guide plate, the chain begins to engage the sprocket.

The invention has the advantages that: when tying up the steel pipe material, this device can replace the tower crane to use, has liberated the occupation time of tower crane, has improved the result of use of tower crane, the cost is reduced. Meanwhile, when the device is used for operation, the operation is simple and convenient, the use field is not limited, and the working efficiency is improved.

Compared with some pull rope type rope tensioners, the chain-ratchet mechanism adopted by the device adopts a mode that the tightening handle drives the chain wheel to rotate, thereby being more labor-saving. Especially for the tight bundle of the steel pipe materials, the steel pipe pile materials are heavy, the rope is not only hard to pull by manpower, but also the steel pipe pile is difficult to be tightly bundled into a round shape due to the limitation of manpower, the bundled steel pipe pile is irregular in shape, a gap is easy to exist between the steel pipe pile and the bundling belt, and the steel pipe is easy to fall off from the bundling belt; when the device is used for tightly bundling the steel pipe stack, due to the lever principle, an operator can easily make the steel pipe stack into a cylindrical shape, and the stability of the bundled steel pipes during transportation is improved. Meanwhile, the ratchet mechanism has the characteristic of stopping along with walking, and the chain is not easy to return after tight binding is finished by matching with a chain wheel-chain meshing structure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is an external view from the left side of embodiment 1 of the present invention;

FIG. 2 is a schematic view of the internal structure of FIG. 1;

FIG. 3 is a left side view of the ratchet wheel and its base of FIG. 2;

FIG. 4 is a top view of the ratchet of FIG. 1 and its base;

FIG. 5 is a rear view of the ratchet and its base of FIG. 1;

FIG. 6 is a partial schematic view of the lower portion of the cinching handle of FIG. 3;

FIG. 7 is a top view of the unbinding handle of FIG. 1;

in the figure, 1, a base, 101, a bottom plate, 102, a vertical plate, 2, a shaft rod, 3, a chain wheel, 4, a tight-binding handle, 401, a pressure rod, 402, a U-shaped frame plate, 403, a second shaft hole, 5, a first pin shaft, 6, a swing rod, 7, a first cylinder, 8, a second pin shaft, 9, a triangular plate, 10, a second cylinder, 11, a cross rod, 12, a loose-binding handle, 13, a gasket, 14, a first guide plate, 15, a second guide plate, 16, a third guide plate, 17, a chain, 18, a third pin shaft, 19, a nut, 20 and a torsion spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

Example 1: a tightening machine based on a ratchet wheel and chain structure is shown in figures 1 and 2 and comprises a base 1 and a chain 17, wherein the chain 17 in the embodiment adopts a transmission chain.

As shown in fig. 4, the base 1 includes a bottom plate 101 horizontally disposed and a left vertical plate 102 and a right vertical plate 102 vertically fixed on the bottom plate 101, a chain passage for the chain 17 to pass through is formed between the two vertical plates 102, the chain passage is a front-back communication structure, a chain inlet of the chain 17 is formed at a rear portion of the chain passage, and a chain outlet of the chain 17 is formed at a front portion of the chain passage.

A ratchet mechanism is arranged between the two vertical plates 102 and is positioned in the chain channel.

As shown in fig. 2 and 3, one end of the chain 17 is hinged to the riser 102 at the chain exit via the third pin 18. A sixth pin hole is formed in the vertical plate 102, the third pin shaft 18 is rotatably inserted into the sixth pin hole, one end of the chain 17 is sleeved on the third pin shaft 18, and a split pin for preventing the chain 17 from falling off is arranged on the third pin shaft 18.

The other end of the chain 17 passes under the base 1, enters the chain channel through the chain entrance, passes through the gap between the chain wheel 3 and the bottom plate 101, and is engaged with the lower part of the chain wheel 3. Then the other end of the chain 17 penetrates out of the chain outlet; the chain 17 makes a loop after one round to form a loop for tightly binding the rod-shaped steel pipe.

As shown in fig. 3 and 4, the ratchet mechanism includes a sprocket mechanism and a pawl mechanism. The sprocket mechanism includes a shaft 2 rotatably provided on two risers 102 and a sprocket 3 fixedly provided on the shaft 2. A left and right through first shaft hole is formed in the vertical plate 102, a bearing is installed in the first shaft hole, and the shaft lever 2 is rotatably arranged in a bearing inner ring of the first shaft hole. The shaft lever 2 is rotatably arranged in the two first shaft holes. The axis of the shaft 2 is parallel to the bottom plate 101, and the shaft 2 is a rod-shaped structure extending horizontally in the left and right directions. The shaft 2 in this embodiment is a pin bolt, and one end of the pin bolt passes through the nut 19 (shown in fig. 1) to prevent the shaft 2 from falling off the riser 102.

The shaft lever 2 is provided with a tightening handle 4 for driving the chain wheel mechanism to rotate. As shown in fig. 5 and 6, the tightening handle 4 includes a pressing rod 401 extending in the up-down direction and a U-shaped frame plate 402 fixed to the lower end of the pressing rod 401, and the U-shaped frame plate 402 has a U-shaped plate structure with a lower opening. U type frame 402 includes two vertical panels about two, all sets up on two vertical panels about and controls penetrating second axle hole 403, and axostylus axostyle 2 passes second axle hole 403, and U type frame 402 passes through second axle hole 403 and rotates and establish on axostylus axostyle 2, and U type frame 402 is located between two risers 102.

The shaft lever 2 is provided with four washers 13 for isolating the U-shaped frame plate 402 from the left and right side members, and one washer 13 is provided on each of the left and right sides of the vertical panel of each U-shaped frame plate 402.

The tight-binding handle 4 further comprises an active pawl mechanism, the active pawl mechanism comprises a first pin shaft 5, a swing rod 6 and a first cylinder 7, a left through third pin hole and a right through third pin hole are formed in the upper end of the swing rod 6, a fourth pin hole corresponding to the third pin hole in the left direction and the right direction is formed in two vertical panels of the U-shaped frame plate 402, and the first pin shaft 5 is rotatably arranged in the third pin hole and the fourth pin hole. The swing rod 6 is rotatably connected with the first pin shaft 5 through a third pin hole. The first pin 5 is parallel to the shaft lever 2, and the first pin 5 is located above the chain wheel 3.

The whole swing rod 6 is of a structure extending obliquely and backwardly, and the swing rod 6 can do circular motion in a vertical interface around the first pin shaft 5. The lower end of the swing rod 6 is fixedly connected with the middle of the first cylinder 7, the first cylinder 7 is of a rod-shaped structure extending horizontally in the left-right direction, the diameter of the first cylinder 7 is the same as that of a semicircle formed by tooth grooves of the chain wheel 3, the first cylinder 7 is movably arranged in one of the tooth grooves at the rear upper part of the chain wheel 3, and when the swing rod 6 is pulled by external force to rotate anticlockwise, the first cylinder 7 can be separated from the chain wheel 3.

When the pressing rod 401 is pressed downwards to rotate clockwise, the swing rod 6 on the U-shaped frame plate 402 drives the first cylinder 7 to move downwards, the first cylinder 7 drives the chain wheel 3 to rotate clockwise, the chain wheel 3 drives the chain 17 to move forwards in the chain channel between the two vertical plates 102, and a loop formed by the chain 17 is reduced.

When the pressing rod 401 is pressed down to a certain angle, the swing rod 6 rotates around the first pin 5 to be closer to a horizontal state, and the first cylinder 7 can be automatically separated from the chain wheel 3. At this time, the operator lifts the pressing rod 401 again to enable the first cylinder 7 to fall into one of the tooth grooves at the rear upper part of the chain wheel 3 again, and the process is continuously repeated until the loop formed by the chain 17 can not be shrunk any more.

The pawl mechanism further comprises a non-return pawl mechanism arranged between the two vertical plates 102, the non-return pawl mechanism is located in front of the chain wheel 3 and used for limiting the anticlockwise rotating movement of the chain wheel 3, and the non-return pawl mechanism can be separated from the chain wheel 3 under the action of external force.

Specifically, as shown in fig. 3 and 4, the pawl stopping mechanism comprises a first pin 8, a triangle 9, a second cylinder 10 and a releasing handle 12; first round pin axle 8 wears to establish on two risers 102, and first round pin axle 8 is parallel to each other with axostylus axostyle 2, and the lower extreme of set-square 9 is equipped with first pinhole, and first round pin axle 8 passes first pinhole, and set-square 9 can take place relative rotation with first round pin axle 8 under the effect of external force.

The rear end of the triangle 9 is fixedly provided with a second cylinder 10 which horizontally extends towards the left and right direction, the second cylinder 10 is parallel to the shaft lever 2, and the diameter of the second cylinder 10 is the same as that of a semicircle formed by tooth grooves of the chain wheel 3.

The upper end of the triangle 9 is welded with a cross rod 11 which horizontally extends towards the left and right direction, and the left and right ends of the cross rod 11 respectively extend to the outer sides of the two vertical plates 102. The unbundling handle 12 is located at the outer side of the two vertical plates 102, the unbundling handle 12 is in a frame-shaped rod structure as shown in fig. 7, and the left end and the right end of the cross rod 11 are respectively fixedly connected with one end of the unbundling handle 12 of the frame-shaped rod structure.

The unbinding handle 12 is located outside the sprocket 3 in the left-right direction. The unbundling handle 12 extends rearwardly away from the end of the crossbar 11 to the rear of the riser 102.

The front parts of the two vertical plates 102 are provided with downward slopes for avoiding the track of the cross rod 11 doing anticlockwise arc-shaped motion around the first pin shaft 8.

When the beam releasing handle 12 is pressed downwards clockwise to rotate, the beam releasing handle 12 drives the triangular plate 9 to rotate around the first pin shaft 8, and the second cylinder 10 at the rear end of the triangular plate 9 falls into one of the tooth grooves in the front part of the chain wheel 3, the beam releasing handle 12 is positioned on the shaft rod 2, at the moment, the shaft rod 2 can stop the downward movement of the beam releasing handle 12, so that the counterclockwise rotary movement of the chain wheel 3 is limited, and the beam releasing handle 12 is prevented from crossing the shaft rod 2 to cause the separation of the second cylinder 10 and the chain wheel 3.

The contact parts of the driving pawl mechanism and the non-return pawl mechanism and the chain wheel 3 are all cylindrical structures with the same diameter as a semicircle formed by tooth grooves of the chain wheel 3, so that the chain wheel 3 can be tightly meshed conveniently, and meanwhile, the arc-shaped continuous surfaces of the first cylinder 7 and the second cylinder 10 can furthest reduce the damage to the body of the chain wheel 3 when the chain wheel 3 is meshed.

A stopping member is arranged below the triangular plate 9, the stopping member in this embodiment is a third guide plate 16, the third guide plate 16 is a plate-shaped structure extending obliquely downwards, the third guide plate 16 is fixedly arranged on the vertical plate 102, the third guide plate 16 is fixedly connected with the vertical plate 102, and the third guide plate 16 is perpendicular to the vertical plate 102.

The first pin shaft 8 is sleeved with a torsion spring 20 which prevents the unbinding handle 12 from automatically falling after being lifted. The torsion spring 20 includes two elastic rods extending upward and downward, respectively, the downward extending elastic rod abuts against the rear portion of the third guide plate 16, and the upward extending elastic rod abuts against the rear side of the cross bar 11; when the second cylinder 10 falls into one of the tooth grooves in the front of the sprocket 3, the torsion spring 20 is in a compressed state.

The function of the third guide plate 16 here is to provide an abutting support for the downwardly extending resilient rod of the torsion spring 20.

The base 1 is provided with a chain guide structure for guiding the movement of the chain 17. The chain guide structure comprises a first guide plate 14 arranged behind the sprocket 3 and a second guide plate 15 arranged in front of the sprocket 3.

The first guide plate 14 is a plate-shaped structure with an inverted 7-shape, the first guide plate 14 is fixedly arranged on the bottom plate 101, the first guide plate 14 is positioned at the rear lower part of the chain wheel 3, and the first guide plate 14 is positioned at the position of a chain inlet of the chain channel. When the chain 17 reaches the highest point along the slope of the first guide plate 14, the chain 17 starts to engage with the sprocket 3.

The second guide plate 15 is located directly below the third guide plate 16, the second guide plate 15 and the third guide plate 16 together forming a chain exit.

The second guide plate 15 is of an inverted 7-shaped plate structure, the second guide plate 15 is fixedly arranged on the bottom plate 101, the inclined surface of the second guide plate 15 faces upwards, and the maximum vertical height of the second guide plate 15 is higher than the height of the end part of the chain 17 hinged with the vertical plate 102.

The chain guide structure is used for limiting the moving space of the chain 17, isolating the fixed end of the chain 17 and the active pawl mechanism. Meanwhile, the inclined upward protruding structure of the first guide plate 14 is beneficial to meshing of the chain 17 and the chain wheel 3, the meshing length of the chain 17 and the chain wheel 3 is increased, and the local stress strength of the chain 17 is reduced.

The working principle is as follows: before use, the unbundling handle 12 is lifted upwards to separate the non-return pawl mechanism from the chain wheel 3. The lifted bundle-releasing handle 12 cannot fall back under the action of gravity under the action of the torsion spring 20, so that the chain wheel 3 is clamped again by the non-return pawl mechanism, and when the chain wheel 3 rotates clockwise to drive the chain 17 to move forwards, the bundle-releasing handle 12 cannot jump up and down, and potential safety hazards are caused. At this time, the unbundling handle 12 is in the release position.

And then, the swing rod 6 is pulled anticlockwise to separate the driving pawl mechanism from the chain wheel 3, and the chain 17 is pulled manually to enlarge the inner diameter of the loop surrounded by the chain 17.

When the chain wheel is used, the tightening handle 4 is in the position shown in figure 1, the swing rod 6 is shifted clockwise, and the first cylinder 7 falls into a tooth groove at the rear upper part of the chain wheel 3. Then the tight-binding handle 4 is pressed downwards, so that the swing rod 6 drives the first cylinder 7 to move downwards, the first cylinder 7 drives the chain wheel 3 to rotate clockwise, the chain wheel 3 drives the chain 17 to move forwards in the chain channel between the two vertical plates 102, and a loop formed by the chain 17 is shrunk.

When the pressing rod 401 is pressed down to a certain angle, the swing rod 6 rotates around the first pin 5 to be closer to a horizontal state, and the first cylinder 7 can be automatically separated from the chain wheel 3. At this time, the operator lifts the pressing rod 401 again to make the first cylinder 7 fall into one tooth groove at the rear upper part of the chain wheel 3 again, and the process is continuously repeated until the loop formed by the chain 17 can not shrink any more (the steel pipe pile tightened by the loop approaches to a cylindrical shape).

After the loop that chain 17 formed tightens the steel pipe, press down and separate bundle handle 12, until separating bundle handle 12 and fall in the top of axostylus axostyle 2, at this moment, axostylus axostyle 2 keeps out and separates the downward trend that bundle handle 12 formed under the drive of sprocket 3 anticlockwise gyration trend, provides for separating bundle handle 12 and blocks the location support. At this time, the second cylinder 10 of the non-return pawl mechanism falls into one of the tooth grooves at the front part of the chain wheel 3, so that the counterclockwise rotary motion of the chain wheel 3 is limited, and the backward trend formed by the chain 17 under the tension of the steel pipe in the loop is blocked. At this point the unbundling handle 12 is in the home position.

And then the steel pipe stack is hooped into a bundle shape by adopting a packing belt, a steel wire ring or other modes. And finally, separating the driving pawl mechanism and the non-return pawl mechanism from the chain wheel 3 again, restoring the tightening handle 4 to the initial position, pulling the chain 17, loosening the ferrule, and taking down the device to finish the operation.

The unbinding handle 12 and the tightening handle 4 are both positioned at the rear side of the rear base 1 when in use, so that the operation is convenient; secondly, after the tightening operation is completed, when the non-return pawl mechanisms are all separated from the chain wheel 3, the tension of the steel pipe in the ferrule is high, the chain 17 in front of the base 1 is easy to be driven to suddenly move backwards, and then the end part of the chain 17 in front of the base 1 is caused to jump, an operator can easily be injured by the end part of the jumping chain 17 if standing in front of the base 1 for operation, and the loosening handle 12 and the tightening handle 4 are both arranged on the rear side of the base 1, so that the potential safety hazard is avoided.

The upper end of the triangle 9 is fixedly connected with the cross bar 11 by welding, rather than by hinging, because the force required when the non-return pawl mechanism is disengaged from the sprocket 3 is relatively large, and the hinging connection easily reduces the force provided by the operator pushing the unbundling handle 12 upwards.

Example 2: a tightening machine based on a ratchet wheel and chain structure is different from the tightening machine in embodiment 1 in that a loosening handle 12 and a cross bar 11 are both positioned between two vertical plates 102. And the sprocket 3 is located between the debagging handles 12. At this time, the vertical plate 102 does not need to be provided with a structure for avoiding the track of the cross rod 11 performing the counterclockwise arc-shaped movement around the first pin shaft 8. The other structure is the same as embodiment 1.

Example 3: a binding machine based on a ratchet and chain structure, the present embodiment is different from embodiment 1 in that when the lower end of a triangle 9 is rotated backward around a second pin 8 to a state greater than 90 degrees (a tilted state of backward deflection), a second cylinder 10 falls into one of tooth grooves in the front of a sprocket 3 to block the counterclockwise rotational movement of the sprocket 3. Under this state, when the chain 17 drives the sprocket 3 to rotate counterclockwise under the external pressure, the second cylinder 10 and the sprocket 3 are more difficult to disengage, and the stability of the non-return pawl mechanism after locking the sprocket 3 is improved. The other structure is the same as embodiment 1.

Example 4: a tightening machine based on a ratchet and chain structure, the difference between this embodiment and embodiment 1 is that when the lower end of the triangle 9 is rotated backward to 90 degrees around the second pin 8 (vertically upward state), the second cylinder 10 falls into one of the tooth grooves in the front of the sprocket 3 to block the counterclockwise rotational movement of the sprocket 3. Under this state, when the chain 17 drives the sprocket 3 to rotate counterclockwise under the external pressure, the second cylinder 10 is not easy to disengage from the sprocket 3, and the stability of the non-return pawl mechanism after locking the sprocket 3 is improved. The other structure is the same as embodiment 1.

Example 5: the difference between the embodiment and the embodiment 1 is that a torsion spring 20 is not arranged on a first pin shaft 8, and a pin shaft which is rough is selected and avoided for use when the first pin shaft 8 is selected, so that the friction force formed between the first pin shaft 8 and a first pin hole of a triangular plate 9 can sufficiently resist the falling trend caused by the dead weight after a bundle removing handle 12 is lifted without the action of external force. The other structure is the same as embodiment 1.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.