CN210113140U

CN210113140U - Automatic binding device for car transportation vehicle

Info

Publication number: CN210113140U
Application number: CN201920073187.6U
Authority: CN
Inventors: 阮卜琴; 肖招银; 牛胜良
Original assignee: Zhejiang Topsun Logistic Control Co Ltd
Current assignee: Zhejiang Topsun Logistic Control Co Ltd
Priority date: 2019-01-16
Filing date: 2019-01-16
Publication date: 2020-02-25
Anticipated expiration: 2029-01-16

Abstract

The utility model provides an automatic ware of binding of sedan-chair fortune car belongs to commodity circulation transportation apparatus technical field. The binding device solves the problems of low automation degree and labor-consuming operation of the car transporting vehicle binding device in the prior art. The automatic binding device for the car carrier comprises a support, a binding belt and a first hook connected to the support, wherein the support is provided with a support plate body in an arc plate shape, a winding shaft used for winding the binding belt is rotatably arranged on the support, one end of the winding shaft is fixedly connected with a worm gear, a worm is rotatably arranged on the support, a motor capable of driving the worm to rotate is further arranged on the support, the worm can axially slide relative to the support, and the worm gear are meshed or not meshed with each other through axial sliding energy of the worm. The utility model has the advantages of high automation degree and convenient use.

Description

Automatic binding device for car transportation vehicle

Technical Field

The utility model belongs to the technical field of commodity circulation transportation apparatus, a automatic ware of binding of sedan-chair fortune car is related to.

Background

During transportation of the vehicle, the vehicle needs to be fixed. The car transportation binding device is a device for fixing wheels of a vehicle to prevent the vehicle from moving randomly in the transportation process.

For example, the chinese patent document discloses an automatic take-up mechanism (application No. 201710048105.8; publication No. CN106799986A) for a wheel holder, which includes a housing, a reel rotatably connected in the housing for taking up a fastening tape, the reel having the fastening tape wound thereon, a ratchet fixed on the reel, and a locking member hinged to the housing and having a pawl. In the process of fixing the vehicle, the wheel fixer realizes the tightening of the binding belt by rotating the reel by an operator through a tool. Such a manner of operation is laborious and therefore the wheel holder has the disadvantage of not being highly automated.

Disclosure of Invention

The utility model aims at having the above-mentioned problem to current technique, provided an automatic ware of binding of sedan-chair fortune car of electrodynamic type, promoted the convenience of using.

The purpose of the utility model can be realized by the following technical proposal: the utility model provides an automatic ware of binding of sedan-chair fortune car, includes the support, binds the area, connects couple one on the support, the support has a supporting plate body that is arc platelike, it is provided with the spool that is used for the roll-up to bind the area to rotate on the support, its characterized in that, the one end of spool has linked firmly the worm wheel, it is provided with the worm to rotate on the support, still be equipped with on the support and drive the worm and carry out pivoted motor, the worm can relative support axial slip and make worm and worm wheel intermeshing or each other not through the axial slip ability through the worm.

This automatic binding device of sedan-chair fortune car is when tightening up the binding area, the worm is in intermeshing's state with the worm wheel, at this moment, rotate through motor drive worm, the worm drives the worm wheel and rotates together, and then realize tightening up of binding area, motor stall when arriving suitable pretightning force, when needs loosen the binding area, only need control motor antiport, can carry out axial removal when the worm antiport, until worm and worm wheel intermeshing, make the worm wheel realize the neutral gear this moment, can pull out the binding area fast, the operation is very convenient.

In the automatic binding device for the car transportation vehicle, the worm comprises a straight bar-shaped rod body, the middle of the rod body is provided with a plurality of spiral teeth, the support is further provided with a worm shaft sleeve, and one end of the rod body is slidably arranged in the worm shaft sleeve in a penetrating mode. The spiral teeth in the middle of the worm are used for meshing with the worm wheel. When the worm rotates to tighten the binding belt, the worm shaft sleeve abuts against the spiral teeth on the worm.

In the automatic binding device for the car transportation vehicle, a driving gear is fixedly connected to a rotating shaft of a motor, a driven gear meshed with the driving gear is arranged on a support, a worm gear connected with the other end of a worm is rotatably arranged on the support, a duplicate gear is further arranged between the driven gear and the worm gear, a large gear of the duplicate gear is meshed with the driven gear, a small gear of the duplicate gear is meshed with the worm gear, a columnar connecting part is integrally formed on a gear surface of the worm gear, which faces away from the spiral teeth, a connecting hole is axially formed in the connecting part, and the other end of the worm is slidably arranged in the connecting hole in a penetrating mode and is circumferentially fixed relative to the connecting hole. The motor rotating shaft drives the worm gear to rotate sequentially through the driving gear, the driven gear and the duplicate gear, and at the moment, as one end of the worm is circumferentially fixed with the connecting hole, the worm can synchronously rotate when the worm gear rotates. And one end of the worm is slidably arranged in the connecting hole in a penetrating mode, so that the worm can axially move, and the function of rapidly winding the belt is achieved.

In the automatic binding device for the car transportation vehicle, a driving gear is fixedly connected to a rotating shaft of the motor, a driven gear meshed with the driving gear is arranged on the support, a driving belt wheel is fixedly connected to one side wall of the driven gear, the axis of the driving belt wheel coincides with the axis of the driven gear, a driven belt wheel is rotatably arranged on the support, a transmission belt is sleeved between the driving belt wheel and the driven belt wheel, a guide hole is formed in the middle of the driven belt wheel, and the other end of the rod body is slidably arranged in the guide hole in a penetrating manner and is circumferentially fixed relative to the guide hole. The motor rotating shaft drives the driven belt wheel to rotate sequentially through the driving gear, the driven gear, the driving belt wheel and the transmission belt, and at the moment, one end of the worm is circumferentially fixed with the guide hole, so that the worm can synchronously rotate when the driven belt wheel rotates. And one end of the worm is slidably arranged in the guide hole in a penetrating mode, so that the worm can axially move, and the function of rapidly winding the belt is achieved.

In the automatic bundler for the car transportation vehicle, the diameters of the driving gear and the driving belt wheel are both smaller than the diameter of the driven gear, and the diameter of the driven belt wheel is larger than the diameter of the driving belt wheel. Through such design, realized tertiary speed reduction, under the circumstances that the power is up to standard is binded in the assurance, can alleviate motor load and motor size for this product is small, and noise at work is little, receives the tape-out process stable moreover.

In the automatic binding device for the car transportation vehicle, the side part of the support, which is positioned on the worm wheel, is also hinged with a jaw, the worm is positioned between the jaw and the worm wheel, one end of the jaw is provided with a tooth part which can be clamped with the spiral teeth of the worm, and an elastic part which is used for driving one end of the jaw, which is provided with the tooth part, to swing towards the worm is arranged between the support and the jaw. When the worm and the worm wheel are meshed, the clamping jaws are acted by the elastic piece to enable the tooth parts to be clamped in the spiral teeth all the time, so that the worm is guided to move axially when the worm rotates, and the worm wheel are meshed or not meshed with each other.

In the automatic binding device for the car transporting vehicle, the elastic piece is a torsion spring or a rubber pad with elasticity. Preferably a torsion spring.

In the automatic binding device for the car transportation vehicle, a spring for driving the worm to extend out of the connecting hole is arranged in the connecting hole, and when the worm moves to one side of the worm gear and is not meshed with the worm gear, the tooth part of the clamping jaw can abut against the spiral teeth of the worm. Through such design, the worm can not be meshed with the worm wheel in the process of rapidly pulling out the binding belt, and the worm wheel is ensured to be in a neutral position state, so that the process of pulling out the binding belt is smooth. And due to the action of the elastic force of the spring, when the worm rotates, the worm can axially move until the worm is meshed with the worm wheel, so that the belt is collected.

In the automatic binding device for the car transportation vehicle, the support further comprises a mounting plate body which is arranged opposite to the convex cambered surface of the supporting plate body, two side plate bodies which are arranged oppositely and vertical to the mounting plate body are fixedly connected between the supporting plate body and the mounting plate body, the driven gear, the driving belt wheel and the driven belt wheel are arranged on the mounting plate body, and the scroll is rotatably arranged between the two side plate bodies.

In the automatic binding device for the sedan vehicle, the support further comprises a mounting plate body arranged opposite to the convex cambered surface of the supporting plate body, two side plate bodies which are arranged oppositely and vertical to the mounting plate body are fixedly connected between the supporting plate body and the mounting plate body, the driven gear, the worm gear and the duplicate gear are arranged on the mounting plate body, and the scroll is rotatably arranged between the two side plate bodies.

In the automatic binding device for the car transportation vehicle, the outer side wall of one side plate body is fixedly connected with a gear cover, the worm wheel, the worm and the clamping jaw are all arranged in the gear cover, the outer side surface of the other side plate body is provided with a motor cover, the motor cover is fixedly connected onto the mounting plate body, and the motor is positioned in the motor cover. The worm wheel, the worm and the clamping jaws are arranged on one side plate body, the motor is arranged on the other side plate body, the space at the two side plate bodies is effectively utilized, and in the later maintenance process, the interference between the two side plate bodies cannot occur, so that the maintenance is convenient.

In the automatic binding device for the sedan car transportation vehicle, the driven belt wheel is also provided with a columnar rotating part, and the cross section of the rotating part is hexagonal. Through the design, the product can also realize manual operation, and realize the pretension and the unloading of the binding belt.

Compared with the prior art, the automatic binding device for the car carrier has the following advantages:

1. the motor, the worm wheel, the worm and other structural designs are adopted, so that the electric belt winding function is realized, and the operation is more convenient and labor-saving;

2. the binding device is provided with a power supply, and the power supply can be replaced quickly, so that the product is more flexible and convenient to use.

3. The design of gear cover, motor cover and battery case for this product has certain waterproof function, promotes the reliability of using on outdoor vehicle.

Drawings

Fig. 1 is a schematic perspective view of a first embodiment of the present invention.

Fig. 2 is a schematic view of a belt retracting state according to an embodiment of the present invention.

Fig. 3 is a schematic view of the embodiment of the present invention in a state of pulling out the binding belt.

Fig. 4 is a cross-sectional view of the embodiment of the present invention in a belt retracting state.

Fig. 5 is a schematic diagram of an internal structure of the first embodiment of the present invention.

Fig. 6 is a schematic perspective view of a bracket according to a first embodiment of the present invention.

Fig. 7 is an exploded view of a motor cover and a battery box according to a first embodiment of the present invention.

Fig. 8 is a schematic perspective view of a second embodiment of the present invention.

Fig. 9 is a schematic view of the second embodiment of the present invention in a belt retracting state.

Fig. 10 is a schematic view of the second embodiment of the present invention in a state where the binding band is pulled out.

Fig. 11 is a schematic perspective view of a second embodiment of the present invention.

Fig. 12 is a schematic view of a transmission structure between the driving gear and the worm gear in the second embodiment of the present invention.

Fig. 13 is a schematic view of a use state of the second embodiment of the present invention.

In the figure, 1, a bracket; 1a, a supporting plate body; 1b, mounting a plate body; 1c, a side plate body; 2. a binding band; 3. a first hook is arranged; 4. a reel; 5. a worm gear; 6. a worm; 61. a rod body; 62. helical teeth; 7. a rubber pad; 8. a worm shaft sleeve; 9. a drive gear; 10. a driven gear; 11. a driving pulley; 12. a passive pulley; 121. a guide hole; 122. a rotating part; 13. a transmission belt; 14. a claw; 141. a tooth portion; 15. an elastic member; 16. a spring; 17. a clamping groove; 18. a clip sheet; 19. a gear cover; 20. a motor cover; 201. a main cover body; 202. a plug cover; 21. a battery case; 22. a second hook; 23. a worm gear; 231. a connecting portion; 24. a duplicate gear; 25. a driven gear.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in figure 1, the automatic binding device for the sedan comprises a support 1, a binding belt 2 and a first hook 3 connected to the support 1, wherein the free end of the binding belt 2 is connected with a second hook 22.

As shown in fig. 2 and 3, a winding shaft 4 for winding the binding band 2 is rotatably arranged on the support 1, one end of the winding shaft 4 is fixedly connected with a worm wheel 5, a worm 6 is rotatably arranged on the support 1, a motor capable of driving the worm 6 to rotate is further arranged on the support 1, the worm 6 can axially slide relative to the support 1, and the worm 6 and the worm wheel 5 can be meshed or not meshed with each other through the axial sliding energy of the worm 6.

As shown in fig. 4, the worm 6 includes a straight rod 61, the middle of the rod 61 has a plurality of spiral teeth 62, the bracket 1 is further provided with a worm bushing 8, and one end of the rod 61 is slidably inserted into the worm bushing 8. The support 1 is provided with a driven belt wheel 12 in a rotating mode, a transmission belt 13 is sleeved between the driving belt wheel 11 and the driven belt wheel 12, a guide hole 121 is formed in the middle of the driven belt wheel 12, and the other end of the rod body 61 penetrates through the guide hole 121 in a sliding mode and is fixed in the circumferential direction. A spring 16 for driving the worm 6 to extend out of the guide hole 121 is provided in the guide hole 121. The driven pulley 12 further has a columnar rotating portion 122, and the cross section of the rotating portion 122 is hexagonal. Through the design, the product can also realize manual operation, and realize the pretension and the unloading of the binding belt 2.

As shown in fig. 4, a claw 14 is further hinged to the side of the bracket 1 located on the worm wheel 5, the worm 6 is located between the claw 14 and the worm wheel 5, one end of the claw 14 has a tooth portion 141 capable of being in clamping connection with the spiral teeth 62 of the worm 6, and an elastic member 15 for driving one end of the claw 14 having the tooth portion 141 to swing towards the worm 6 is arranged between the bracket 1 and the claw 14. The elastic member 15 is a spring. As shown in fig. 2, when the worm 6 is engaged with the worm wheel 5, the pawl 14 is acted by the elastic member 15 so that the tooth portion 141 is always caught in the spiral teeth 62. As shown in fig. 3, when the worm 6 is rotated in the belt loosening direction and the worm 6 is moved toward the driven pulley 12 so as not to be meshed with the worm wheel 5, the tooth portion 141 of the dog 14 can abut against the spiral tooth 62 of the worm 6. Through the design, the worm 6 is prevented from being meshed with the worm wheel 5 in the process of rapidly pulling out the binding belt 2, and the worm wheel 5 is ensured to be in a neutral state, so that the process of pulling out the binding belt 2 is smooth.

As shown in fig. 5, a driving gear 9 is fixedly connected to a rotating shaft of the motor, a driven gear 10 engaged with the driving gear 9 is disposed on the bracket 1, a driving pulley 11 is fixedly connected to a side wall of the driven gear 10, the driving pulley 11 and the driven gear 10 have axial leads coincident, the diameters of the driving gear 9 and the driving pulley 11 are both smaller than the diameter of the driven gear 10, and the diameter of the driven pulley 12 is larger than the diameter of the driving pulley 11. Through such design, realized tertiary speed reduction, under the circumstances that the power is up to standard is binded in the assurance, can alleviate motor load and motor size for this product is small, and noise at work is little, receives the tape-out process stable moreover. The motor rotating shaft drives the driven belt wheel 12 to rotate sequentially through the driving gear 9, the driven gear 10, the driving belt wheel 11 and the transmission belt 13, and at the moment, because one end of the worm 6 is circumferentially fixed with the guide hole 121, the worm 6 can synchronously rotate when the driven belt wheel 12 rotates.

As shown in fig. 6, the support 1 includes a supporting plate 1a in an arc plate shape, and a mounting plate 1b disposed opposite to the convex arc surface of the supporting plate 1a, two side plates 1c disposed opposite to each other and perpendicular to the mounting plate 1b are fixedly connected between the supporting plate 1a and the mounting plate 1b, and a rubber pad 7 for contacting with a wheel is disposed on the outer side surface of the supporting plate 1 a. The driven gear 10, the driving pulley 11 and the driven pulley 12 are all arranged on the mounting plate body 1b, and the reel 4 is rotatably arranged between the plate bodies 1c on the two sides. With reference to fig. 1 and 5, a gear cover 19 is fixedly connected to the outer side wall of one of the side plate bodies 1c, the worm wheel 5, the worm 6 and the claws 14 are all arranged in the gear cover 19, a motor cover 20 is arranged on the outer side surface of the other side plate body 1c, the motor cover 20 is fixedly connected to the mounting plate body 1b, and the motor is located in the motor cover 20 and not shown in the motor drawing. The worm wheel 5, the worm 6 and the clamping jaws 14 are arranged on one side plate body 1c, the motor is arranged on the other side plate body 1c, the space at the positions of the two side plate bodies 1c is effectively utilized, and in the later maintenance process, the interference between the two side plate bodies cannot occur, so that the maintenance is convenient.

As shown in fig. 7, the motor cover 20 includes a cylindrical main cover body 201 and a cylindrical plug cover 202 connected to the outer peripheral wall of the main support 1, a battery box 21 is inserted into the plug cover 202, and the battery box 21 and the plug cover 202 are fixed by the snap-fit groove 17 and the snap-fit piece 18. Through the design, the product is provided with the battery and is more flexible and convenient to use. And battery case 21 can quick assembly disassembly, and the battery is changed also conveniently.

Example two

The structure and principle of the present embodiment are basically the same as those of the first embodiment, and the difference is mainly that the motor drives the worm 6 to rotate in a different manner.

As shown in fig. 8 and 11, the automatic bundler for the sedan comprises a support 1, a binding belt 2 and a first hook 3 connected to the support 1, wherein a second hook 22 is connected to the free end of the binding belt 2.

As shown in fig. 9 and 10, the elastic member 15 is a torsion spring, the worm 6 includes a rod 61 in a straight strip shape, the middle of the rod 61 has a plurality of spiral teeth 62, the bracket 1 is further provided with a worm bushing 8, and one end of the rod 61 is slidably inserted into the worm bushing 8. The support 1 is rotatably provided with a worm gear 23, a columnar connecting part 231 is integrally formed on the gear surface of the worm gear 23, which faces away from the spiral teeth 62, a connecting hole is formed in the connecting part 231 along the axial direction, the other end of the worm 6 is slidably arranged in the connecting hole in a penetrating manner and is circumferentially fixed relative to the connecting hole, and a spring 16 pushing the worm 61 outwards is arranged in the connecting hole.

As shown in fig. 12, a driving gear 9 is fixedly connected to a rotating shaft of the motor, a driven gear 25 engaged with the driving gear 9 is arranged on the bracket 1, a duplicate gear 24 is further arranged between the driven gear 25 and the worm gear 23, a large gear of the duplicate gear 24 is engaged with the driven gear 25, and a small gear of the duplicate gear 24 is engaged with the worm gear 23. The driven gear 25, the worm gear 23, and the duplicate gear 24 are all provided on the mounting plate body 1 b.

Fig. 13 shows a schematic view of the use state of the automatic binding device for the sedan, when the wheels are fixed, the worm 6 and the worm wheel 5 are in a state of not being meshed with each other, at the moment, the binding belt 2 can be pulled out rapidly, the pulled binding belt 2 bypasses the top of the wheels, the first hook 3 and the second hook 22 are respectively hooked on the floor of the transport vehicle, then, the motor drives the worm 6 to rotate, due to the action of the elastic force of the spring 16, when the worm 6 rotates, the worm 6 can move axially until the worm 6 is meshed with the worm wheel 5, the belt is collected, and when the proper pre-tightening force is reached, the motor stops rotating, and the binding is completed.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although 1, the stent is used more herein; 1a, a supporting plate body; 1b, mounting a plate body; 1c, a side plate body; 2. a binding band; 3. a first hook is arranged; 4. a reel; 5. a worm gear; 6. a worm; 61. a rod body; 62. helical teeth; 7. a rubber pad; 8. a worm shaft sleeve; 9. a drive gear; 10. a driven gear; 11. a driving pulley; 12. a passive pulley; 121. a guide hole; 122. a rotating part; 13. a transmission belt; 14. a claw; 141. a tooth portion; 15. an elastic member; 16. a spring; 17. a clamping groove; 18. a clip sheet; 19. a gear cover; 20. a motor cover; 201. a main cover body; 202. a plug cover; 21. a battery case; 22. hooks, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The utility model provides an automatic ware of binding of sedan-chair fortune car, includes support (1), ties and ties on support (1) and get in touch one (3), support (1) has one and is arc platelike supporting plate body (1a), it is provided with spool (4) that are used for the roll-up to tie up bandage (2) to rotate on support (1), its characterized in that, the one end of spool (4) has linked firmly worm wheel (5), it is provided with worm (6) to rotate on support (1), still be equipped with on support (1) and drive worm (6) and carry out pivoted motor, worm (6) can make worm (6) and worm wheel (5) intermeshing or each other do not mesh through the axial slip ability through worm (6) relative support (1).

2. The automatic binding device for the sedan according to claim 1, wherein the worm (6) comprises a straight bar-shaped bar body (61), the middle of the bar body (61) is provided with a plurality of spiral teeth (62), the bracket (1) is further provided with a worm shaft sleeve (8), and one end of the bar body (61) is slidably arranged in the worm shaft sleeve (8).

3. The automatic bundler for sedan car transportation vehicle as claimed in claim 2, wherein the rotating shaft of the motor is fixedly connected with a driving gear (9), a driven gear (25) meshed with the driving gear (9) is arranged on the bracket (1), a worm gear (23) connected with the other end of the worm (6) is also rotatably arranged on the bracket (1), a duplicate gear (24) is also arranged between the driven gear (25) and the worm gear (23), the big gear of the duplicate gear (24) is meshed with the driven gear (25), the small gear of the duplicate gear (24) is meshed with the worm gear (23), a columnar connecting part (231) is integrally formed on the gear surface of the worm gear (23) back to the spiral gear (62), connecting hole is axially arranged in the connecting part (231), and the other end of the worm (6) is slidably arranged in the connecting hole in a penetrating manner and is circumferentially fixed relative to the connecting hole.

4. The automatic binding device for the sedan car transportation vehicle as claimed in claim 2, wherein a driving gear (9) is fixed on a rotating shaft of the motor, a driven gear (10) meshed with the driving gear (9) is arranged on the support (1), a driving pulley (11) is fixedly connected to one side wall of the driven gear (10), the axis of the driving pulley (11) is coincident with the axis of the driven gear (10), a driven pulley (12) is rotatably arranged on the support (1), a transmission belt (13) is sleeved between the driving pulley (11) and the driven pulley (12), a guide hole (121) is formed in the middle of the driven pulley (12), and the other end of the rod body (61) is slidably arranged in the guide hole (121) and is circumferentially fixed relative to the guide hole (121).

5. The trolley automatic binder according to claim 4, characterized in that the driving gear (9) and the driving pulley (11) each have a diameter smaller than the diameter of the driven gear (10), and the diameter of the driven pulley (12) is larger than the diameter of the driving pulley (11).

6. The automatic binding device of the car carrier as claimed in claim 3, wherein a jaw (14) is further hinged to the side of the support (1) located on the worm wheel (5), the worm (6) is located between the jaw (14) and the worm wheel (5), one end of the jaw (14) is provided with a tooth portion (141) capable of being clamped with the spiral teeth (62) of the worm (6), and an elastic member (15) for driving one end of the jaw (14) provided with the tooth portion (141) to swing towards the worm (6) is arranged between the support (1) and the jaw (14).

7. The automatic binding device of the car carrier as claimed in claim 6, wherein a spring (16) for driving the worm (6) to extend out of the connecting hole is arranged in the connecting hole, and when the worm (6) moves to the side of the worm gear (23) to be not meshed with the worm wheel (5), the tooth part (141) of the claw (14) can abut against the spiral tooth (62) of the worm (6).

8. The automatic binding device for the sedan carrier according to claim 3, wherein the support (1) further comprises a mounting plate body (1b) arranged opposite to the convex cambered surface of the support plate body (1a), two side plate bodies (1c) which are arranged opposite and perpendicular to the mounting plate body (1b) are fixedly connected between the support plate body (1a) and the mounting plate body (1b), the driven gear (25), the worm gear (23) and the duplicate gear (24) are arranged on the mounting plate body (1b), and the reel (4) is rotatably arranged between the two side plate bodies (1 c).

9. The automatic car carrier binding device according to claim 8, wherein a gear cover (19) is fixedly connected to the outer side wall of one side plate body (1c), the worm wheel (5), the worm (6) and the claws (14) are all arranged in the gear cover (19), a motor cover (20) is arranged on the outer side surface of the other side plate body (1c), the motor cover (20) is fixedly connected to the mounting plate body (1b), and the motor is located in the motor cover (20).