Portable fixing device for battery of electric bicycle

Abstract

The invention relates to the technical field of new energy bicycles, in particular to an electric bicycle battery portable fixing device which comprises a battery box, a battery is mounted in the battery box, a hinge groove is formed in the left side of the top of the battery box, a hinge shaft is mounted on the hinge groove, and a quick mounting cover is mounted on the battery box. The left end of the quick-assembly cover is mounted on the hinged shaft, a hooking part is arranged at the right end of the quick-assembly cover, is bent downwards and is buckled in the right side of an inner cavity of the battery box to fasten the battery in the battery box, a left-right through assembly hole is formed in the right end of the battery box, a locking mechanism is mounted in the assembly hole, and the locking mechanism is connected with the quick-assembly cover. The service life of the battery is prolonged, the fault of the battery is known through the opening state of the quick-assembly cover, and the situation that the temperature in the battery box 1 continues to rise, an explosion environment is formed, and accidents happen is avoided through opening of the quick-assembly cover.

Description

Technical Field

[0001] The invention relates to the technical field of new energy bicycles, and in particular to a portable battery fixing device for an electric bicycle. Background Art

[0002] New energy batteries are installed on new energy bicycles (electric bicycles), and use new energy batteries as driving power instead of manual pedaling. The electric bicycle saves labor and improves comfort when driving. In most cases, a battery port is reserved on the pedal, and the battery is placed in the battery port to provide power to the motor through the interconnection between the terminals. The battery is connected to the control system to enable the bicycle to achieve electric braking and speed control.

[0003] Generally, the batteries on electric bicycles are made of multiple pieces to increase energy storage. However, this installation method requires that the batteries be installed in the battery port one by one. This method results in low installation and replacement efficiency. In order to prevent the batteries from shaking, the size of the batteries is basically the same as that of the battery port on the electric vehicle. The heat generated by the batteries cannot be quickly released in the battery port, posing a safety hazard. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a portable battery fixing device for an electric bicycle, comprising a battery box, wherein the battery box contains a battery, a hinge groove is provided on the left side of the top of the battery box, a hinge shaft is installed on the hinge groove, a quick-release cover is installed on the battery box, the left end of the quick-release cover is installed on the hinge shaft, a hook portion is provided on the right end of the quick-release cover, the hook portion is bent downward and buckled in the right side of the inner cavity of the battery box to fasten the battery in the battery box, an assembly hole communicating left and right is provided on the right end of the battery box, a locking mechanism is installed in the assembly hole, the locking mechanism includes a locking frame and a locking block, a locking gap is formed between the right end of the battery and the right wall of the inner cavity of the battery box, the locking frame is located in the assembly hole, and the left end of the locking frame enters the locking gap The locking mechanism further comprises a locking spring, a limiting plate being fixed on the battery box, one end of the locking spring being connected to the limiting plate and being elastically stretched, and the other end entering the assembly hole and being connected to the locking frame, a heat-conducting rod being fixed in the locking gap, the heat-conducting rod being vertically upward, and a horizontal portion being provided at the top end of the heat-conducting rod, a plastic bending portion being provided between the locking frame and the locking portion, the bottom surface of the locking frame and the bottom surface of the plastic bending portion both sliding on the horizontal portion, and the left side of the heat-conducting rod being tightly attached to the right end surface of the battery.

[0005] As a further preferred embodiment, a groove is opened on the right side of the battery box, the locking tension spring is located in the groove, and the limiting plate is fixed on the outer end of the groove.

[0006] As a further preferred embodiment, fixing holes are provided at left and right ends of the battery box, and the battery box is fixed to the electric vehicle through the fixing holes.

[0007] As further preferred, the locking texture is also provided on the hook portion, and when the hook portion is buckled on the locking portion, the locking texture on the hook portion is locked and matched with the locking texture on the locking portion.

[0008] As a further preferred embodiment, the assembly holes are two symmetrical front and back locations, each of the two assembly holes is provided with a set of the locking mechanism, the hooking part at the right end of the quick-release cover is provided with two front and back locations, and the two hooking parts are respectively locked and matched with the two locking parts through the locking texture.

[0009] As a further preferred embodiment, the grooves are two symmetrical places front and back, and a limit plate is fixed to the outer ends of the two grooves. The inner end of the groove on the front side is communicated with the assembly hole on the front side, and the groove on the rear side is communicated with the assembly hole on the rear side. A locking spring is provided in each of the two grooves, and one end of the two locking springs enters the assembly hole and is respectively connected to the two locking frames, and the other ends of the two locking springs reach the outer ends of the grooves and are respectively connected to the limit plates at the outer ends of the two grooves.

[0010] As a further preference, the heat conducting rods are provided at two locations, front and rear, and the horizontal portions at the top ends of the two heat conducting rods are respectively in contact with the bottom surfaces of the plastically bent portions of the two locking frames.

[0011] As a further preferred embodiment, a driving shaft is provided in the front and rear assembly holes, a gear is installed on the driving shaft, the locking frame is provided with a stretching part horizontally in the assembly hole, the locking tension spring is connected to the stretching part, and a tooth surface meshing with the gear is provided on the top surface of the stretching part, and storage grooves are provided on the front and rear surfaces of the battery box, one end of the front driving shaft passes through the storage groove on the front side of the battery box and is installed with a first transmission wheel, one end of the rear driving shaft passes through the storage groove on the rear side of the battery box and is installed with a second transmission wheel, the front end of the hinge shaft enters the storage groove on the front side and is installed with a third transmission wheel, and the rear end of the hinge shaft enters the storage groove on the rear side and is installed with a fourth transmission wheel, the first transmission wheel and the third transmission wheel are connected by a conveyor belt, and the second transmission wheel and the fourth transmission wheel are connected by a conveyor belt.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] A quick-release cover is provided in the battery box, and the battery can be quickly closed into the battery box, and the battery can be quickly assembled on the electric vehicle in a portable manner. A locking mechanism is provided. When the battery generates high heat due to overload or other factors, the heat conduction relationship in the locking mechanism causes the machine transmission wheel to drive the hinge shaft to rotate counterclockwise, and the quick-release cover is quickly opened by utilizing the rotation of the hinge shaft. The quick-release cover is quickly opened, so that the heat on the battery box and the battery in the battery box is quickly released. When high temperature occurs suddenly, the service life of the battery is improved, and the battery failure is detected through the opening state of the quick-release cover. Thirdly, the quick-release cover is opened to prevent the battery box 1 from continuing to heat up, forming an explosion environment, and causing an accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of a portable battery fixing device for an electric bicycle provided in an embodiment of the present invention;

[0015] Figure 2 A portable battery fixing device for an electric bicycle provided in an embodiment of the present invention comprises Figure 1 A schematic diagram from another perspective;

[0016] Figure 3 A schematic diagram of a portable battery fixing device for an electric bicycle provided by an embodiment of the present invention after being cut apart from the middle position;

[0017] Figure 4 A schematic diagram of a portable battery fixing device for an electric bicycle provided by an embodiment of the present invention after being cut open at one of its assembly holes;

[0018] Figure 5 A portable battery fixing device for an electric bicycle provided in an embodiment of the present invention comprises Figure 4 A schematic diagram of another angle of view with the battery box opened upwards;

[0019] Figure 6 A schematic diagram of a portable battery fixing device for an electric bicycle from a back perspective provided in an embodiment of the present invention.

[0020] In the figure: 1. battery box; 2. battery; 3. hinge slot; 4. hinge shaft; 5. quick-release cover; 6. hook portion; 7. assembly hole; 8. locking mechanism; 9. locking frame; 10. locking block; 11. locking gap; 12. locking portion; 13. locking texture; 14. locking tension spring; 16. limit plate; 15. groove; 17. heat conducting rod; 18. horizontal portion; 19. plastic bending portion; 20. fixing hole; 21. driving shaft; 22. gear; 23. stretching portion; 24. tooth surface; 25. storage slot; 26. first transmission wheel; 27. second transmission wheel; 28. third transmission wheel; 29. ​​fourth transmission wheel. DETAILED DESCRIPTION

[0021] The above and other embodiments and advantages of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0022] In one embodiment, Figure 1-Figure 6 As shown:

[0023] The present embodiment provides a portable battery fixing device for an electric bicycle, comprising a battery box 1, wherein the battery box 1 contains a battery 2, a hinge groove 3 is provided on the left side of the top of the battery box 1, a hinge shaft 4 is installed on the hinge groove 3, and fixing holes 20 are provided on the left and right ends of the battery box 1. The battery 2 is easy to transfer and carry with the battery box 1, and is also easy to install on the electric vehicle. The battery box 1 is fixed to the electric vehicle through the fixing holes 20. In addition, a quick-release cover 5 is installed on the battery box 1, the left end of the quick-release cover 5 is installed on the hinge shaft 4, and the right end of the quick-release cover 5 is provided with a hook portion 6, which is bent downward and buckled in the right side of the inner cavity of the battery box 1 to fasten the battery 2 in the battery box 1. The right end of the battery box 1 is provided with an assembly hole 7 that communicates left and right, and a locking mechanism 8 is installed in the assembly hole 7. The locking mechanism 8 includes a locking frame 9 and a locking block 10. A locking gap 11 is formed between the right end of the battery 2 and the right wall of the inner cavity of the battery box 1. The locking frame 9 is located in the assembly hole 7. The left end of the locking frame 9 enters the locking gap 11 and is provided with a locking portion 12 that is inclined toward the upper side of the right surface and abuts against the right end surface of the battery 2. The locking block 10 is arranged on the locking portion 12 A locking texture 13 is provided on the right side surface. When the hook portion 6 is buckled in the locking gap 11, it is restricted to the locking texture 13 for self-locking. The locking mechanism 8 also includes a locking tension spring 14. A limiting plate 16 is fixed on the battery box 1. One end of the locking tension spring 14 is connected to the limiting plate 16 and is elastically stretched, and the other end enters the assembly hole 7 and is connected to the locking frame 9. A heat-conducting rod 17 is fixed in the locking gap 11. The heat-conducting rod 17 is vertically upward, and a horizontal portion 18 is provided at the top of the heat-conducting rod 17. A plastic bending portion 19 is provided between the locking frame 9 and the locking portion 12. The bottom surface of the locking frame 9 and the bottom surface of the plastic bending portion 19 both slide on the horizontal portion 18, and the left side of the heat-conducting rod 17 is tightly attached to the right end surface of the battery 2.

[0024] A groove 15 is provided on the right side of the battery box 1, the locking tension spring 14 is located in the groove 15, and the limit plate 16 is fixed on the outer end of the groove 15. Figures 1 to 5 When the battery box 1 is covered in the manner shown, the locking tension spring 14 is in a tensioned state due to the locking relationship, that is, the free end of the locking tension spring 14 is stretched and tightened toward the locking gap 11 as the locking frame 9 is locked.

[0025] like Figure 4 , Figure 5As shown, the hook portion 6 is also provided with a locking texture 13. When the hook portion 6 is buckled on the locking portion 12, the locking texture 13 on the hook portion 6 is locked and matched with the locking texture 13 on the locking portion 12. The hook portion 6 is a downwardly bent portion of the free end of the quick-install cover 5. The inner surface of the hook portion 6 also has a locking texture 13. When the hook portion 6 is inserted into the locking gap 11, in addition to the inner wall hooking on the locking block 10, so that the locking block 10 and the locking frame 9 are locked toward the locking gap 11, the locking texture 13 between the two is also used to increase the locking force between the two, so as to prevent the quick-install cover 5 from automatically rotating and opening.

[0026] like Figures 4 to 6 As shown, the working principle and effect are as follows: the battery box 1 is fixed in the battery port of the electric vehicle through the fixing hole 20, and the battery 2 is fixed to the electric vehicle through the battery box 1. In actual assembly, the positive and negative electrode connection ports are reserved on the quick-release cover 5 to connect the positive and negative electrodes of the battery 2 to the terminals on the electric vehicle through wires to realize power supply. It is well known that the battery 2 generates heat when it works for a long time. Once the heat generated by the battery 2 exceeds the melting point of the plastic bending part 19, the high heat is transferred to the horizontal part 18 through the heat conducting rod 17, and the horizontal part 1 8 is transferred to the stretching portion 23, and then transferred to the locking frame 9 by the stretching portion 23, and then transferred to the plastic bending portion 19 by the locking frame 9, resulting in the concentrated heating of the plastic bending portion 19. At this time, the plastic bending portion 19 is either melted or plastically deformed. For example, when the plastic bending portion 19 is plastically deformed, there will be insufficient strength to push the locking block 10 against the right end surface of the battery 2, and at this time, there will be insufficient locking force to lock the hooking portion 6. The hooking portion 6 is a structure on the free end of the quick-install cover 5, and is also the part of the quick-install cover 5 that is buckled in the locking gap 11. Therefore, once the plastic bending portion 19 is plastically deformed, not only will there be insufficient locking force to lock the hooking portion 6, but there will also be insufficient pulling force to keep the locking tension spring 14 stretched. At this time, the locking tension spring 14 will shrink rapidly along the groove 15, and use the reverse pulling force generated during shrinkage to drag the stretching portion 23 outward. The stretching portion 23 drives the gear 22 to rotate counterclockwise using the tooth surface 24, and the gear 22 drives the drive shaft 21 to rotate counterclockwise, and the drive shaft 21 drives the second transmission wheel 27 at the end to rotate counterclockwise, and the second transmission wheel 27 drives the second transmission wheel 27 to rotate counterclockwise. 27 drives the third transmission wheel 28 to rotate counterclockwise through the conveyor belt, and the third transmission wheel 28 drives the hinge shaft 4 to rotate counterclockwise. The hinge shaft 4 rotates counterclockwise to quickly open the quick-release cover 5 upward. The quick-release cover 5 is quickly opened, so that the heat on the battery box 1 and the battery 2 in the battery box 1 is quickly released. When a high temperature phenomenon occurs suddenly, the service life of the battery 2 is improved. Secondly, the battery failure is detected through the opening state of the quick-release cover 5. Thirdly, the quick-release cover 5 is opened to prevent the battery box 1 from continuing to heat up, forming an explosive environment and causing an accident.

[0027] Following the above, Figure 1 , Figure 2 as well as Figure 6 As shown, the assembly holes 7 are two symmetrical locations front and back, and a set of locking mechanisms 8 is respectively provided in the two assembly holes 7. The hooking parts 6 at the right end of the quick-release cover 5 are provided at two locations front and back, and the two hooking parts 6 are respectively locked and matched with the two locking parts 12 through the locking textures 13. The grooves 15 are two symmetrical locations front and back, and a limiting plate 16 is fixed to the outer ends of the two grooves 15. The inner end of the groove 15 on the front side is communicated with the assembly hole 7 on the front side, and the groove 15 on the rear side is communicated with the assembly hole 7 on the rear side. A locking tension spring 14 is respectively provided in the two grooves 15, and one end of the two locking tension springs 14 enters the assembly hole 7 and is respectively connected to the two locking frames 9, and the other ends of the two locking tension springs 14 reach the outer ends of the grooves 15 and are respectively connected to the limiting plates 16 at the outer ends of the two grooves 15, and the horizontal portions 18 at the top ends of the two heat-conducting rods 17 are respectively in contact with the bottom surfaces of the plastic bending portions 19 of the two locking frames 9. A driving shaft 21 is provided in the front and rear assembly holes 7, and a gear 22 is installed on the driving shaft 21. The locking frame 9 is provided with a stretching portion 23 horizontally in the assembly hole 7, and a locking tension spring 14 is connected to the stretching portion 23. A tooth surface 24 meshing with the gear 22 is provided on the top surface of the stretching portion 23. Receiving grooves 25 are provided on the front and rear surfaces of the battery box 1. One end of the front driving shaft 21 passes through the receiving groove 25 on the front side of the battery box 1 and is installed in the first transmission wheel 26. One end of the rear driving shaft 21 passes through the receiving groove 25 on the rear side of the battery box 1 and is installed in the second transmission wheel 27. The front end of the hinge shaft 4 enters the receiving groove 25 on the front side and is installed in the third transmission wheel 28. The rear end of the hinge shaft 4 enters the receiving groove 25 on the rear side and is installed in the fourth transmission wheel 29. The first transmission wheel 26 and the third transmission wheel 28 are connected by a conveyor belt, and the second transmission wheel 27 and the fourth transmission wheel 29 are connected by a conveyor belt.

[0028] In accordance with the above, not only are two front and rear assembly holes 7 provided at the same side end of the battery box 1, but also two sets of locking mechanisms 8 are provided in the two assembly holes 7. When the hook portion 6 on the free end of the quick-release cover 5 is buckled in the locking gap 11, the front and rear locking textures 13 will be utilized to achieve locking with the locking blocks 10 on the two locking frames 9 through the locking textures 13. The two locking frames 9 will move toward the locking gap 11 and drag the two locking tension springs 14 toward the two assembly holes 7 through the stretching portion 23. At the same time, the bottom surfaces of the stretching portions 23 of the two locking frames 9 will fall on the top ends of the two heat-conducting rods 17 (horizontally). The heat conducting rod 17 is made of copper and has high thermal conductivity. Once the battery 2 in the battery box 1 generates high heat, the generated high heat is transferred to the two heat conducting rods 17, which are then transferred to the two stretching parts 23, and then to the two locking frames 9, and then to the respective plastic bending parts 19 through the two locking frames 9, causing their plastic bending parts 19 to be concentratedly heated. At this time, their plastic bending parts 19 either melt or plastically deform. If the plastic bending parts 19 are plastically deformed, there will not be enough strength to hold the two locking blocks 19. 0 is pressed against the right end surface of the battery 2. At this time, there is not enough locking force to lock the hooking part 6, and there is not enough pulling force to make the two locking tension springs 14 continue to stretch toward the direction of the assembly hole 7. At this time, the two locking tension springs 14 will shrink rapidly along the groove 15, and use the reverse pulling force generated during shrinkage to drag the two stretching parts 23 outward. The two stretching parts 23 use their respective tooth surfaces 24 to drive the two gears 22 to rotate, and the two gears 22 drive the front and rear drive shafts 21 to rotate. The two drive shafts 21 respectively drive the first transmission wheel 26 and the second transmission wheel 27 to rotate, and the second transmission wheel 27 drives the third transmission wheel 28 through the conveyor belt. The fourth transmission wheel 29 rotates counterclockwise, and the hinge shaft 4 rotates. The quick-release cover 5 is quickly opened upward by the rotation of the hinge shaft 4. The quick-release cover 5 is quickly opened, so that the heat on the battery box 1 and the battery 2 in the battery box 1 is quickly released. Since two sets of front and rear locking mechanisms 8 are provided, two front and rear heat-conducting rods 17 are provided, and the first transmission wheel 26, the second transmission wheel 27, the third transmission wheel 28 and the fourth transmission wheel 29 are provided for the two sets of front and rear locking mechanisms 8, the technical effects of high temperature detection and heat dissipation protection after detection are further improved.

[0029] The above orientation designations do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the orientations are described relatively with reference to the figures. In essence, the specific orientations of the components are described according to their actual installation and actual use as well as the customary orientations of those skilled in the art. This is hereby explained.

[0030] The specific implementation methods described above further describe the invention purpose, technical solutions, and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A portable battery fixing device for an electric bicycle, characterized in that: The battery box (1) comprises a battery (2) installed in the battery box (1), a hinge groove (3) is provided on the left side of the top of the battery box (1), a hinge shaft (4) is installed on the hinge groove (3), a quick-install cover (5) is installed on the battery box (1), the left end of the quick-install cover (5) is installed on the hinge shaft (4), and the right end of the quick-install cover (5) is provided with a hook portion (6), the hook portion (6) is bent downward and buckled in the right side of the inner cavity of the battery box (1), so as to fasten the battery (2) to the battery box (1) ), the right end of the battery box (1) is provided with an assembly hole (7) which is communicated with the left and right sides, a locking mechanism (8) is installed in the assembly hole (7), the locking mechanism (8) comprises a locking frame (9) and a locking block (10), a locking gap (11) is formed between the right end of the battery (2) and the right wall of the inner cavity of the battery box (1), the locking frame (9) is located in the assembly hole (7), the left end of the locking frame (9) enters the locking gap (11) and is provided with a locking block (10) which is inclined toward the upper right side and contacts the battery (2) ) on the right end surface, the locking block (10) is arranged on the right side surface of the locking portion (12) and is provided with a locking texture (13), when the hook portion (6) is buckled in the locking gap (11), it is restricted to self-locking on the locking texture (13), the locking mechanism (8) also includes a locking tension spring (14), a limiting plate (16) is fixed on the battery box (1), one end of the locking tension spring (14) is connected to the limiting plate (16) and is elastically stretched, and the other end enters the assembly hole ( 7) is connected to the locking frame (9), a heat-conducting rod (17) is fixed in the locking gap (11), the heat-conducting rod (17) is vertically upward, and a horizontal portion (18) is provided at the top of the heat-conducting rod (17), a plastic bending portion (19) is provided between the locking frame (9) and the locking portion (12), the bottom surface of the locking frame (9) and the bottom surface of the plastic bending portion (19) both slide on the horizontal portion (18), and the left side of the heat-conducting rod (17) is tightly attached to the right end surface of the battery (2).

2. A portable battery fixing device for an electric bicycle according to claim 1, characterized in that: A groove (15) is provided on the right side of the battery box (1), the locking tension spring (14) is located in the groove (15), and the limiting plate (16) is fixed on the outer end of the groove (15).

3. A portable battery fixing device for an electric bicycle according to claim 1, characterized in that: The left and right ends of the battery box (1) are provided with fixing holes (20), and the battery box (1) is fixed to the electric vehicle through the fixing holes (20).

4. A portable battery fixing device for an electric bicycle according to claim 2, characterized in that: The hook portion (6) is also provided with the locking texture (13). When the hook portion (6) is buckled onto the locking portion (12), the locking texture (13) on the hook portion (6) is locked and matched with the locking texture (13) on the locking portion (12).

5. A portable battery fixing device for an electric bicycle according to claim 3, characterized in that: The assembly holes (7) are two symmetrical locations at the front and back, and each of the two assembly holes (7) is provided with a set of the locking mechanism (8). The hooking portion (6) at the right end of the quick-release cover (5) is provided with two locations at the front and back, and the two hooking portions (6) are respectively locked and matched with the two locking portions (12) through the locking texture (13).

6. A portable battery fixing device for an electric bicycle according to claim 4, characterized in that: The grooves (15) are located at two symmetrical positions at the front and rear sides. A limiting plate (16) is fixed to the outer ends of the two grooves (15). The inner end of the groove (15) on the front side is communicated with the assembly hole (7) on the front side, and the groove (15) on the rear side is communicated with the assembly hole (7) on the rear side. A locking tension spring (14) is respectively arranged in the two grooves (15). One end of the two locking tension springs (14) enters the assembly hole (7) and is respectively connected to the two locking frames (9). The other ends of the two locking tension springs (14) reach the outer ends of the grooves (15) and are respectively connected to the limiting plates (16) at the outer ends of the two grooves (15).

7. A portable battery fixing device for an electric bicycle according to claim 6, characterized in that: The heat conducting rods (17) are located at two locations, front and rear, and the horizontal portions (18) at the top ends of the two heat conducting rods (17) are respectively in contact with the bottom surfaces of the plastically bent portions (19) of the two locking frames (9).

8. A portable battery fixing device for an electric bicycle according to claim 7, characterized in that: A drive shaft (21) is provided in the front and rear assembly holes (7), a gear (22) is installed on the drive shaft (21), the locking frame (9) is provided with a stretching portion (23) horizontally arranged in the assembly hole (7), the locking tension spring (14) is connected to the stretching portion (23), a tooth surface (24) meshing with the gear (22) is provided on the top surface of the stretching portion (23), and a storage groove (25) is provided on the front and rear surfaces of the battery box (1), one end of the front drive shaft (21) passes through the storage groove (25) on the front side of the battery box (1), and a first drive shaft (21) is installed in the storage groove (25). A driving wheel (26) is provided, one end of the rear driving shaft (21) passes through the storage groove (25) on the rear side of the battery box (1) and is installed with a second transmission wheel (27), the front end of the hinge shaft (4) enters the storage groove (25) on the front side and is installed with a third transmission wheel (28), the rear end of the hinge shaft (4) enters the storage groove (25) on the rear side and is installed with a fourth transmission wheel (29), the first transmission wheel (26) and the third transmission wheel (28) are connected by a conveyor belt, and the second transmission wheel (27) and the fourth transmission wheel (29) are connected by a conveyor belt.

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