Feeding mechanism of rectangular winding machine

Abstract

The utility model relates to the technical field of coil winding, in particular to a feeding mechanism of a rectangular winding machine. The feeding mechanism comprises a working table, a discharging assembly, a moving assembly and at least one clamping assembly are arranged on the table top of the working table, and the clamping assemblies are arranged on the moving assembly and used for clamping a rectangular iron core; the clamping assembly comprises a clamping plate, the clamping plate is fixedly connected to the upper plate face of the sliding plate, a notch for the winding machine body to rotate is formed in the plate face of the clamping plate, a limiting roller capable of conducting reciprocating motion is installed on the clamping plate in a sliding mode, a second motor is installed on the plate face of the clamping plate, and the second motor is connected with a driving roller. A plurality of driven rollers are mounted on the plate surface of the clamping plate, and a belt is wound on the driving roller and the driven rollers, so that the effect of improving the winding efficiency when the winding machine winds a rectangular coil is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of coil winding, and in particular to a feeding mechanism of a rectangular winding machine. Background Art

[0002] A winding machine is a device that can wind enameled copper wire around an iron core to make a coil. The iron core is usually a closed ring.

[0003] The existing rectangular winding machine is usually composed of three major parts: a machine head, a clamp, and a wire storage ring. When winding a rectangular coil, a clamp equipped with a belt is usually used to fix the iron core. The staff places the iron core to be wound on the belt clamp, pulls the belt to fix the iron core and tighten it, and then starts the winding machine to evenly wind the enameled copper wire on the iron core.

[0004] The above-mentioned prior art solutions have the following defects: when winding a plurality of rectangular coils, the staff need to manually tighten the belt and wind it around the fixed roller each time the material is loaded, which results in low working efficiency. Utility Model Content

[0005] In order to improve the winding efficiency of a winding machine when winding a rectangular coil, the present application provides a feeding mechanism for a rectangular winding machine.

[0006] The above technical objectives of this application are achieved through the following technical solutions:

[0007] A feeding mechanism of a rectangular winding machine comprises a workbench, on the workbench surface is provided a blanking assembly, a moving assembly and a clamping assembly arranged on the moving assembly for clamping a rectangular iron core, wherein at least one clamping assembly is provided;

[0008] The clamping assembly includes a clamping plate, which is fixed to the upper surface of the skateboard. The surface of the clamping plate is provided with a notch for the winding machine body to rotate. A limiting roller capable of reciprocating motion is slidably mounted on the clamping plate. A second motor is mounted on the surface of the clamping plate. The second motor is connected to a driving roller. A driven roller is mounted on the surface of the clamping plate. A plurality of driven rollers are provided. Belts are wound around the driving roller and the driven roller.

[0009] By adopting the above technical scheme, the rectangular coil can be fixed after the blanking assembly pushes the rectangular iron core onto the clamping plate. During winding, the second motor is started to drive the active roller to drive the belt to rotate, which can drive the rectangular iron core clamped by the clamping assembly to rotate at a uniform speed. After the winding is completed, the second electric push rod contracts and drives the limit roller to move, which can release the limit on the wound rectangular coil. During operation, multiple rectangular iron cores are passed through the blanking assembly, the clamping assembly and the moving assembly until they reach the winding machine body in sequence, which can speed up the loading speed, reduce the operating steps of the staff, and improve the winding efficiency of the rectangular coil.

[0010] Optionally, the blanking assembly includes a vertically arranged blanking tube, the lower end of the blanking tube is fixedly connected to a limiting guide groove, and a first blanking plate and a second blanking plate are coaxially rotatably arranged on the side wall of the limiting guide groove, and the plate surfaces of the first blanking plate and the second blanking plate are both provided with notches for the rectangular iron core to fall into, and the thickness difference between the first blanking plate and the second blanking plate can only accommodate one rectangular iron core, and a first electric push rod is installed on the workbench, and a push plate is fixedly connected to the output end of the first electric push rod, and the push plate can push the rectangular iron core out of the limiting guide groove.

[0011] By adopting the above-mentioned technical scheme, controlling the rotation of the first blanking plate and the second blanking plate can make the rectangular iron core fall down in sequence. At the same time, according to the position of the clamping assembly, the first electric push rod is controlled to push the rectangular iron core onto the clamping assembly, which is conducive to the clamping assembly to firmly clamp the rectangular iron core, and can realize automatic loading according to the processing speed, thereby improving the winding efficiency of the rectangular coil.

[0012] Optionally, the moving component includes a slide rail and a slide plate, the slide rail is installed on the table top of the workbench, and the slide rail is a closed track, the slide plate is slidably set on the slide rail, at least one slide plate is provided, and the clamping component is installed on the slide plate, a first motor is installed on the workbench, and the output shaft of the first motor is connected to a driving gear through a key.

[0013] By adopting the above technical solution, the slide plate is moved to the blanking assembly for loading. After the loading is completed, the slide plate will drive the clamping assembly holding the rectangular iron core to move to the winding machine body, which can reduce the operating steps of the staff, increase the loading speed of the winding machine, and improve the winding efficiency of the rectangular coil.

[0014] Optionally, the slide rail is made of I-beam.

[0015] By adopting the above technical solution, the stability of the movement of the slide plate can be increased, ensuring that the clamping assembly can stably clamp the rectangular coil.

[0016] Optionally, guide wheels are installed at the bottom of the skateboard, and there are at least two guide wheels.

[0017] By adopting the above technical solution, the guide wheels move in the grooves on both sides of the slide rail, thereby increasing the stability of the movement of the slide plate, reducing the resistance of the slide plate when moving on the slide rail, and ensuring that the clamping assembly can stably clamp the rectangular coil.

[0018] Optionally, the moving component also includes a power component, which includes a driven gear, and the driven gear is arranged on a workbench. Chains are wound around the driving gear and the driven gear, and the chain is arranged along a slide rail. A pin is fixed to the bottom of the slide, and the pin can pass through the chain hole of the chain and be fixed to the chain.

[0019] By adopting the above technical solution, the first motor is controlled to drive the driving gear and the chain to rotate, which can drive the slide plate to move to the blanking assembly or the winding machine body, thereby increasing the loading speed of the winding machine and improving the winding efficiency of the rectangular coil.

[0020] Optionally, at least two second slide grooves are opened on the plate surface of the clamping plate, and a third electric push rod is installed in the second slide groove. A tensioning roller is installed on the output end of the third electric push rod, and the tensioning roller is also wound on the belt.

[0021] By adopting the above technical solution, the adaptability of the belt to clamping rectangular iron cores of different sizes can be increased. When the clamping assembly fixes the rectangular iron core, the range in which the belt can be tensioned can be increased, ensuring that the blanking assembly can smoothly push the rectangular iron core onto the clamping plate. After the winding is completed, the third electric push rod contracts and drives the tensioning roller to move, making it easier for the staff to remove the wound rectangular coil from the clamping assembly, thereby improving the winding efficiency of the rectangular coil.

[0022] Optionally, the clamping assembly includes a clamping plate, a third slide groove is formed on the clamping plate, a fixing block is welded in the third slide groove, an elastic member is fixedly connected to the fixing block, a hook is fixedly connected to one end of the elastic member, and the hook can pull the belt.

[0023] By adopting the above technical solution, the belt can be kept loose during loading and is not easy to detach from the plate surface of the clamping plate. After the winding work is completed, the limit roller and the tensioning roller move to release the belt from the fixation of the rectangular coil. The belt can be pulled away from the rectangular coil by the elastic part and the hook, which makes it convenient for the staff to remove the wound rectangular coil from the clamping assembly, thereby improving the winding efficiency of the rectangular coil.

[0024] In summary, this application has the following technical effects:

[0025] 1. By setting up the blanking assembly, moving assembly and clamping assembly, the rectangular iron core can reach the winding machine body in sequence, which can speed up the loading speed, reduce the operating steps of the staff, and improve the winding efficiency of the rectangular coil;

[0026] 2. By setting up the third electric push rod and the tensioning roller, the adaptability of the belt to the clamping of rectangular cores of different sizes can be increased, which makes it easier for the staff to remove the wound rectangular coil from the clamping assembly, thereby improving the winding efficiency of the rectangular coil;

[0027] 3. By setting up a fixing block, an elastic part and a draw hook, the belt can be kept loose during loading and is not easy to detach from the plate surface of the clamping plate. After the winding work is completed, the limit roller and the tensioning roller move to release the belt from fixing the rectangular coil. The belt can be pulled away from the rectangular coil by the elastic part and the draw hook, which makes it convenient for the staff to remove the wound rectangular coil from the clamping assembly, thereby improving the winding efficiency of the rectangular coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the appearance structure diagram of this application;

[0029] Figure 2 It is a prominent structural diagram of the winding machine body, wire storage ring and movable block of the present application;

[0030] Figure 3 It is a prominent structural diagram of the blanking assembly of this application;

[0031] Figure 4 It is a prominent structural diagram of the mobile components of this application;

[0032] Figure 5 It is a prominent structural diagram of the clamping assembly and rectangular core of the present application.

[0033] Description of the accompanying drawings: 1. winding machine body; 11. wire storage ring; 111. movable block; 2. workbench; 3. blanking assembly; 31. blanking pipe; 311. limiting guide groove; 32. first rotating rod; 33. first blanking plate; 34. second blanking plate; 35. first electric push rod; 351. push plate; 4. moving assembly; 41. slide rail; 42. slide plate; 421. guide wheel; 43. driving gear; 44 , driven gear; 45, chain; 5, clamping assembly; 51, clamping plate; 511, first slide groove; 512, second slide groove; 52, limiting roller; 521, second electric push rod; 53, driving roller; 54, driven roller; 55, tensioning roller; 551, third electric push rod; 56, belt; 57, fixing block; 571, third slide groove; 58, elastic member; 59, hook; 6, rectangular iron core. DETAILED DESCRIPTION

[0034] The present application is further described in detail below in conjunction with the accompanying drawings.

[0035] The present application embodiment discloses a feeding mechanism of a rectangular winding machine, referring to Figure 1 and Figure 2The feeding mechanism includes a workbench 2, on which a winding machine body 1 is slidably mounted, a wire storage ring 11 is mounted on the winding machine body 1, and a movable block 111 is arranged on the wire storage ring 11, one end of the movable block 111 is hinged to the wire storage ring 11, and the other end is clamped to the wire storage ring 111. A blanking assembly 3 is also arranged on the table surface of the workbench 2 away from the winding machine body 1, and a moving assembly 4 is arranged on the workbench 2, and the moving assembly 4 is located between the winding machine body 1 and the blanking assembly 3. A clamping assembly 5 is arranged on the moving assembly 4, and a plurality of clamping assemblies 5 can be arranged, and the clamping assembly 5 is used to clamp the rectangular iron core 6 to be wound.

[0036] When using the present feeding mechanism, the rectangular iron core 6 to be wound is placed in the blanking assembly 3, the blanking assembly 3 can control the rectangular iron core 6 to fall and push the rectangular iron core 6 onto the clamping assembly 5, and the clamping assembly 5 fixes the rectangular iron core 6, then the clamping assembly 5 moves to the winding machine body 1 along with the moving assembly 4, the staff moves the winding machine body 1 and releases the movable block 111 of the winding machine body 1 from the clamping connection with the wire storage ring 11, when the wire storage ring 11 passes through the rectangular iron core 6, the movable block 111 is clamped with the winding ring 11, the winding machine body 1 is started to wind the rectangular iron core 6, and the copper wire is wound on the rectangular iron core 6 to form a rectangular coil, after the winding is completed, the staff opens the movable block 111 and moves the winding machine body 1 away from the clamping assembly 5, so that the wire storage ring 11 is away from the rectangular iron core 6, at this time the clamping assembly 5 releases the fixation of the rectangular coil, and the staff can remove the wound rectangular coil. A plurality of rectangular cores 6 pass through the blanking assembly 3, the clamping assembly 5 and the moving assembly 4 until reaching the winding machine body 1, which can speed up the loading speed, reduce the operation steps of the staff, and improve the winding efficiency of the rectangular coil.

[0037] Reference Figure 3The blanking assembly 3 includes a blanking tube 31, which is vertically arranged. A limiting guide groove 311 is fixedly arranged at the lower end of the blanking tube 31. The limiting guide groove 311 is fixedly mounted on the table surface of the workbench 2 at one end away from the winding machine body 1. A first rotating rod 32 is arranged on the blanking tube 31 near the workbench 2. A first blanking plate 33 and a second blanking plate 34 are welded on the first rotating rod 32. The first blanking plate 33 and the second blanking plate 34 are both circular and have notches on the plate surface. The first blanking plate 33 and the second blanking plate 34 are arranged in sequence along the length direction of the first rotating rod 32, and the plate surface is perpendicular to the length direction of the first rotating rod 32. The distance between the first blanking plate 33 and the second blanking plate 34 can only accommodate one rectangular iron core 6. A notch for the first blanking plate 33 and the second blanking plate 34 to rotate is provided on the side wall of the limiting guide groove 311. A first electric push rod 35 is installed on the workbench 2 , and a push plate 351 is welded on the output end of the first electric push rod 35 . When the rectangular iron core 6 falls into the limiting guide groove 311 , the push plate 351 can push the rectangular iron core 6 out of the limiting guide groove 311 .

[0038] When the moving assembly 4 drives a clamping assembly 5 to move toward the blanking assembly 3 and finally aligns with the limiting guide groove 311, the first rotating rod 31 drives the first blanking plate 33 and the second blanking plate 34 to rotate, and the rectangular iron core 6 on the first blanking plate 33 falls into the limiting guide groove 311, and the next rectangular iron core 6 to be processed falls to the end surface of the top of the first blanking plate 33, and the first electric push rod 35 extends to drive the push plate 351 to push the rectangular iron core 6 to the clamping assembly 5. After the clamping assembly 5 clamps the rectangular iron core 6, the first electric push rod 35 contracts to drive the push plate 351 to retreat. The rectangular iron core 6 can be controlled to fall in sequence by rotating the first blanking plate 33 and the second blanking plate 34. At the same time, the first electric push rod 35 is controlled to push the rectangular iron core 6 onto the clamping assembly 5 according to the position of the clamping assembly 5, which is conducive to the clamping assembly 5 to firmly clamp the rectangular iron core 6, and can realize automatic loading according to the processing speed, thereby improving the winding efficiency of the rectangular coil.

[0039] Reference Figure 4 The moving component 4 includes a slide rail 41 and a slide plate 42. The slide rail 41 is installed on the table top of the workbench 2. The slide rail 41 is a closed track made of I-beam and triangular in shape. The slide rail 41 is located between the blanking component 3 and the winding machine body 1. The slide plate 42 is slidably arranged on the slide rail 41. There are at least three slide plates 42. The clamping component 5 is installed on the upper surface of the slide plate 42. A guide wheel 421 is installed at the bottom of the slide plate 42. There are two guide wheels 421 and they can be respectively embedded in the grooves on both sides of the slide rail 41.

[0040] Reference Figure 4The moving assembly 4 also includes a power assembly, which includes a first motor installed on the workbench 2. The output shaft of the first motor is connected to a driving gear 43 through a key. The driving gear 43 is located at the inner corner of the slide rail 41. A driven gear 44 is installed on the workbench 2. There are two driven gears 44 and they are respectively located at the inner corners of the slide rail 41. A chain 45 is wound around the driving gear 43 and the driven gear 44. A pin is welded at the bottom of the slide plate 42, and the pin can pass through the chain hole of the chain 45 and be fixedly connected to the chain 45.

[0041] When the feeding mechanism is used, the first motor rotates to drive the driving gear 43 and the chain 45 to rotate, and the slide plate 42 connected to the chain 45 moves along the slide rail 41 to the blanking assembly 3. At this time, the first motor stops, and the first motor continues to rotate after the clamping assembly 5 firmly clamps the rectangular core 6. When the slide plate 42 moves along the slide rail 41 to the winding machine body 1, it stops again. The winding machine body 1 winds the rectangular core 6. After the rectangular coil is wound, the clamping assembly 5 releases the clamping of the rectangular coil. After the staff removes the wound rectangular coil, the first motor continues to rotate, so that the slide plate 42 drives the clamping assembly 5 to continue to rotate to the blanking assembly 3 to clamp the next rectangular core 6 to be processed. By driving the slide plate 42 to move simultaneously by the first motor, the driving gear 43 and the chain 45, the rectangular core 6 is fed and wound, which can improve the feeding speed of the winding machine and the winding efficiency of the rectangular coil.

[0042] Reference Figure 5 The clamping assembly 5 includes a clamping plate 51, which is fixed to the upper plate surface of the slide plate 42 by bolts. A notch is provided on the plate surface of the clamping plate 51 close to the winding machine body 1. The clamping plate 51 is provided with a first slide groove 511. There are two first slide grooves 511, which are respectively arranged on both sides of the notch along the length direction of the clamping plate 51. A second electric push rod 521 is installed at one end away from the other of the two first slide grooves 511. A limit roller 52 is installed on the output end of the second electric push rod 521, and the limit roller 52 can move along the edge of the clamping plate 51. A second motor is embedded and installed on the surface of the clamping plate 51 close to the winding machine body 1. The output shaft of the second motor is connected to the driving roller 53 through a key. The driving roller 53 is located at one end of the clamping plate 51 in the length direction. A driven roller 54 is installed on the surface of the clamping plate 51. Three driven rollers 54 are installed, and one of them is located at the end of the clamping plate 51 in the length direction away from the driving roller 53. The other two driven rollers 54 are respectively located on both sides of the clamping plate 51 in the length direction near the second electric push rod 521.

[0043] Reference Figure 5A second slide groove 512 is provided on the plate surface of the clamping plate 51 away from the winding machine body 1. Two second slide grooves 512 are provided and their length direction is the same as the length direction of the clamping plate 51. The two second slide grooves 512 are adjacently provided along the width direction of the clamping plate 51. A third electric push rod 551 is installed at one end of the second slide groove 512, and the output ends of the two third electric push rods 551 are opposite. A tensioning roller 55 is installed on the output end of the third electric push rod 551. The limiting roller 52, the driving roller 53, the driven roller 54 and the tensioning roller A belt 56 is wound around 55. When the third electric push rod 551 contracts and drives the tensioning roller 55 to move, the belt 56 can be loosened. When the second electric push rod 521 contracts and drives the limiting roller 52 to move, the iron core to be wound can be pushed from between the two limiting rollers 52 onto the clamping plate 51. Then the second electric push rod 521 is extended to drive the limiting roller 52 to move, so that the belt 56 can wrap the iron core to be wound. When the third electric push rod 551 is extended to drive the two tensioning rollers 55 to move, the belt 56 can be tightened and fix the iron core to be wound.

[0044] Reference Figure 5 A third slide groove 571 is provided on the clamping plate 51. The third slide groove 571 is provided on the plate surface of the clamping plate 51 and is provided along the width direction of the clamping plate 51. Two fixing blocks 57 are welded to the side wall of the third slide groove 571 close to the tensioning roller 55. The two fixing blocks 57 are respectively arranged at both ends of the length direction of the third slide groove 571. An elastic member 58 is welded to the side of the fixing block 57 close to the rectangular iron core 6. In this embodiment, the elastic member 58 is a tension spring. One end of the elastic member 58 is fixedly connected to the fixing block 57, and the other end is welded with a hook 59. The hook 59 is U-shaped and can pull the belt 56. The hook 59 can slide in the third slide groove 571. The hook 59 can pull the belt 56 toward the fixing block 57 under the tension of the elastic member 58 connected thereto.

[0045] When the clamping assembly 5 moves to the blanking assembly 3, the blanking assembly 3 pushes the rectangular iron core 6 onto the surface of the clamping plate 51, the second electric push rod 521 extends, pushes the limiting roller 52 to move, so that the belt 56 wraps and limits the rectangular iron core 6, then the third electric push rod 551 extends, pushes the tensioning roller 55 to move, so that the belt 56 clamps and fixes the rectangular iron core 6, when the clamping assembly 5 moves to the winding machine body 1, the staff moves the winding machine body 1 to the notch near the clamping plate 51 and starts the winding machine body 1, the second motor starts, drives the active roller to rotate, and the belt 56 rotates The rectangular iron core 6 is driven to rotate for winding. When the winding work is completed, the staff moves the winding machine body 1 away from the clamping plate 51. At the same time, the third electric push rod 551 contracts, driving the tensioning roller 55 to move, so that the belt 56 releases the clamping fixation of the rectangular coil. The second electric push rod 521 contracts, driving the limiting roller 52 to move, so that the belt 56 releases the limit on the rectangular coil. The staff removes the wound rectangular coil to complete the winding work. At this time, the hook 59 pulls the belt 56 toward the fixed block 57 to prevent the loose belt 56 from detaching from the clamping assembly 5. By extending and retracting the second electric push rod 521 and the third electric push rod 551, the belt 56 can be controlled to fix the rectangular iron core 6. When the winding machine body 1 winds the rectangular iron core 6, the second motor can control the active roller 53 to rotate to drive the rectangular iron core 6 to rotate, so as to firmly fix the rectangular iron core 6, thereby improving the feeding efficiency of the winding machine body 1 and the working efficiency of the winding machine body 1 when winding the rectangular iron core 6.

[0046] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A feeding mechanism for a rectangular winding machine, characterized in that: The feeding mechanism comprises a workbench (2), on the workbench (2) a blanking assembly (3), a moving assembly (4) and a clamping assembly (5) arranged on the moving assembly (4) for clamping a rectangular iron core (6), wherein at least one clamping assembly (5) is provided; The clamping assembly (5) comprises a clamping plate (51), the clamping plate (51) is fixedly connected to the upper plate surface of the slide plate (42), the plate surface of the clamping plate (51) is provided with a notch for the winding machine body (1) to rotate, a limiting roller (52) capable of reciprocating motion is slidably mounted on the clamping plate (51), a second motor is mounted on the plate surface of the clamping plate (51), the second motor is connected to a driving roller (53), a driven roller (54) is mounted on the plate surface of the clamping plate (51), a plurality of driven rollers (54) are provided, and belts (56) are wound around the driving roller (53) and the driven roller (54).

2. A feeding mechanism for a rectangular winding machine according to claim 1, characterized in that: The blanking assembly (3) comprises a vertically arranged blanking tube (31), the lower end of the blanking tube (31) is fixedly connected to a limiting guide groove (311), a first blanking plate (33) and a second blanking plate (34) are coaxially rotatably arranged on the side wall of the limiting guide groove (311), the plate surfaces of the first blanking plate (33) and the second blanking plate (34) are both provided with a notch for the rectangular iron core (6) to fall down, the thickness difference between the first blanking plate (33) and the second blanking plate (34) can only accommodate one rectangular iron core (6), a first electric push rod (35) is installed on the workbench (2), a push plate (351) is fixedly connected to the output end of the first electric push rod (35), and the push plate (351) can push the rectangular iron core (6) out of the limiting guide groove (311).

3. The feeding mechanism of a rectangular winding machine according to claim 2 is characterized in that: The moving assembly (4) comprises a slide rail (41) and a slide plate (42), wherein the slide rail is mounted on the table surface of the workbench (2), and the slide rail (41) is a closed track, and the slide plate (42) is slidably mounted on the slide rail (41), and at least one slide plate (42) is provided, and the clamping assembly (5) is mounted on the slide plate (42), and a first motor is mounted on the workbench (2), and an output shaft of the first motor is connected to a driving gear (43) via a key.

4. The feeding mechanism of a rectangular winding machine according to claim 3 is characterized in that: The slide rail (41) is made of I-beam.

5. The feeding mechanism of a rectangular winding machine according to claim 4, characterized in that: A guide wheel (421) is installed at the bottom of the slide plate (42), and there are at least two guide wheels (421).

6. A feeding mechanism for a rectangular winding machine according to claim 5, characterized in that: The moving assembly (4) also includes a power assembly, which includes a driven gear (44), the driven gear (44) is arranged on the workbench (2), a chain (45) is wound around the driving gear (43) and the driven gear (44), the chain (45) is arranged along the slide rail (41), and a pin is fixedly connected to the bottom of the slide plate (42), and the pin can pass through the chain hole of the chain (45) and is fixedly connected to the chain (45).

7. The feeding mechanism of a rectangular winding machine according to claim 1, characterized in that: At least two second slide grooves (512) are provided on the plate surface of the clamping plate (51), a third electric push rod (551) is installed in the second slide groove (512), a tensioning roller (55) is installed on the output end of the third electric push rod (551), and the tensioning roller (55) is also wound on the belt (56).

8. A feeding mechanism for a rectangular winding machine according to claim 7, characterized in that: The clamping assembly (5) comprises a clamping plate, a third slide groove (571) is provided on the clamping plate (51), a fixing block (57) is welded inside the third slide groove (571), an elastic member (58) is fixedly connected to the fixing block (57), a pull hook (59) is fixedly connected to one end of the elastic member (58), and the pull hook (59) is capable of pulling the belt (56).

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