A battery cover appearance detection device

Abstract

The application discloses a battery cover appearance detection equipment, including a conveying belt, a plurality of clamping grooves are evenly arranged on the conveying belt in the width direction, a plurality of material cylinders for loading battery covers are evenly arranged on one side of the conveying belt, a plurality of bosses are fixedly connected to the bottom end face of the material cylinder, a positioning assembly is arranged below the boss, and a limiting assembly is assembled on the positioning assembly; when the positioning assembly is clamped at the joint of two battery covers and moves downward, the bottommost battery cover is clamped at the limiting assembly, and the conveying belt drives the material cylinder to rotate and is staggered with the conveying belt in the process of rotating; the conveying belt drives the battery cover and the material cylinder to rotate in the process of rotating, and the material cylinder is moved away from above the conveying belt, and another material cylinder is rotated to above the conveying belt to continue working, the structure can screen the battery cover with a thickness not meeting the regulation, and thus the defective products are prevented from being sent out synchronously with the conveying belt.

Description

Technical Field

[0001] This invention relates to the field of battery cover appearance inspection technology, and in particular to a battery cover appearance inspection device. Background Technology

[0002] As we all know, the battery cap is a core component of a cylindrical battery. It not only serves as a conductive electrode, but also provides a sealing function and a safety valve. Its quality directly affects the battery's lifespan and personal safety. Therefore, the battery cap needs to undergo strict appearance defect inspection before assembly.

[0003] Chinese patent CN217940964U discloses an online CCD inspection device for lithium battery caps, relating to the field of lithium battery cap production technology. The device includes a collection box, a bracket, a base, and a controller. A conveyor belt is externally connected to a transmission wheel, and a rotating rod is externally rotatably connected to a fixed shaft. A feeding cylinder is fixedly connected to the outer end of a fixed frame, and a pressure rod is inserted through the inside of the fixed cylinder. A stop block abuts against the other end of the pressure rod. This solution, by setting up a feeding cylinder, baffle, transmission wheel, conveyor belt, transmission groove, and transparent pad, enables the lithium battery caps in the feeding cylinder to be transported sequentially and equidistantly to the inspection area via the transmission groove, eliminating the need for manual operation and greatly improving production efficiency and automation. The fixed shaft, rotating rod, baffle, pressure rod, return spring, and stop block make the feeding operation during lithium battery cap inspection more convenient and faster, further reducing labor load and intensity.

[0004] The aforementioned device stores and unloads lithium battery caps using a feeding cylinder. However, in actual use, when the battery caps are thick, they get stuck at the bottom of the feeding cylinder, making it difficult for the conveyor belt to carry the material out, resulting in poor continuity of operations. When the battery caps are thin, the device cannot screen them out, causing defective products to be transported along with the conveyor belt.

[0005] Therefore, it is necessary to provide a battery cover appearance inspection device to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a battery cover appearance inspection device to solve the problem mentioned in the background art that the existing device stores and unloads lithium battery caps through a feeding cylinder. However, in actual use, when the battery cap is thick, it will get stuck at the bottom of the feeding cylinder. At this time, it is difficult to carry the material out by the conveyor belt, resulting in poor continuity of operation.

[0007] Based on the above ideas, the present invention provides the following technical solution: including a conveyor belt, on which multiple slots are evenly opened along its width direction, and multiple material cylinders for loading battery covers are evenly arranged on one side of the conveyor belt. Multiple bosses are fixedly connected to the bottom end face of the material cylinders, and a positioning component is provided below the bosses, and a limit component is assembled on the positioning component.

[0008] When the positioning component engages with the seam between the two battery covers and moves downwards, the bottommost battery cover engages with the limiting component, and the rotation of the conveyor belt drives the material cylinder to rotate through the slot and is offset from the conveyor belt.

[0009] As a further aspect of the present invention: the positioning component includes a positioning plate slidably disposed on the bottom of the boss, a positioning strip slidably disposed on the inner side of the positioning plate, and the bottom surface of the positioning strip is flush with the bottom surface of the positioning plate. A groove is formed at the bottom of the positioning plate, the positioning strip is slidably disposed in the groove, a crossbar is fixedly connected to the side wall of the groove away from the positioning strip, the crossbar extends into the interior of the positioning strip and slides with the positioning strip, a second spring is sleeved on the outer side of the crossbar, and the two ends of the second spring are fixedly connected to the inner end wall of the groove and the end face of the positioning strip, respectively.

[0010] As a further embodiment of the present invention: the limiting component includes a locking block that rotatably engages with the positioning plate. One side of the locking block is set as an inclined surface. A through hole is provided on the positioning plate. The locking block is rotatably disposed in the through hole. A sliding rod is provided between the locking block and the boss. The bottom end of the sliding rod extends into the locking block and is slidably connected thereto. A limiting block is fixedly connected to the outer top end of the sliding rod. A blind hole is provided on the bottom surface of the boss. A spiral limiting groove is provided on the inner wall of the blind hole. The limiting block is slidably disposed in the limiting groove. A circular hole that engages with the sliding rod is provided on the top surface of the locking block. A sliding groove is symmetrically provided on the inner wall of the circular hole. A slider that slidably engages with the sliding groove is fixedly connected to the outer circumferential surface of the sliding rod.

[0011] As a further embodiment of the present invention: a guide post is fixedly connected to the top of the positioning plate, an annular plate is fixedly sleeved on the outer side of the boss, the guide post can pass through the annular plate and slide with it, a first spring is sleeved on the outer side of the guide post, and the two ends of the first spring are respectively fixed to the bottom surface of the annular plate and the top surface of the positioning plate.

[0012] As a further aspect of the present invention: a support plate is provided at the top inner end of the conveyor belt, and a support platform parallel to it is provided on the outer side of the conveyor belt.

[0013] As a further embodiment of the present invention: a fixed shaft is fixedly connected to the top surface of the support platform, a sleeve is sleeved on the outer side of the fixed shaft, a groove is opened on the outer circumferential surface of the fixed shaft, an installation hole is opened on the inner wall of the sleeve, and a protrusion is slidably arranged in the installation hole, the protrusion cooperates with the groove, and a third spring is also arranged in the installation hole.

[0014] As a further aspect of the present invention: a support rod is fixedly connected between the material cylinder and the sleeve, and the support rod is threadedly connected to both the sleeve and the material cylinder.

[0015] As a further aspect of the present invention: a pressure block is slidably disposed inside the material cylinder, a guide strip is fixedly connected to the outer circumferential surface of the pressure block, and a guide groove is provided on the inner wall of the material cylinder to slide and cooperate with the guide strip.

[0016] As a further aspect of the present invention: a support is provided on the outer side of the conveyor belt, an electric push rod is provided on the support, and a push plate is connected to the output end of the electric push rod.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: When the thickness of the battery cover meets the requirements, the bottom battery cover can be carried out and passed over the limiting component through the slot on the conveyor belt. When the thickness of the battery cover is thinner, the positioning component is engaged at the seam of the two battery covers and will move downwards a certain distance. At this time, the limiting component can limit the bottom battery cover. When the slot on the conveyor belt moves the bottom battery cover, the limiting component makes it difficult for the battery cover to move out from the bottom of the material cylinder. Therefore, the conveyor belt will drive the battery cover and the material cylinder to rotate during the rotation, and the material cylinder will move away from the top of the conveyor belt. The other material cylinder will then rotate to the top of the conveyor belt to continue the operation. This structure can be used to screen battery covers that do not meet the thickness requirements, thereby preventing defective products from being sent out synchronously with the conveyor belt. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the material cylinder and conveyor belt structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the positioning plate and boss structure of the present invention;

[0022] Figure 4 This is a card block distribution diagram of the present invention;

[0023] Figure 5 This is a cross-sectional view of the barrel of the present invention;

[0024] Figure 6 This is a schematic diagram of the limiting groove structure of the present invention;

[0025] Figure 7 This is the present invention. Figure 5 A magnified structural diagram at point A;

[0026] Figure 8 This is the present invention. Figure 7 A magnified structural diagram at point B;

[0027] Figure 9 This is a schematic diagram of the protrusion and third spring structure of the present invention;

[0028] Figure 10 This is a schematic diagram of the limiting block structure of the present invention.

[0029] In the diagram: 1. Side plate; 2. Conveyor belt; 3. Pressure block; 4. Material cylinder; 5. Fixed shaft; 6. Sleeve; 7. Bracket; 8. Push plate; 9. Slot; 10. Support plate; 11. Block; 12. First spring; 13. Slide rod; 14. Battery cover; 15. Positioning plate; 16. Boss; 17. Limiting groove; 18. Guide bar; 19. Guide post; 20. Second spring; 21. Crossbar; 22. Positioning bar; 23. Third spring; 24. Protrusion; 25. Limiting block; 26. Slider; 27. Electric push rod; 28. Support platform. Detailed Implementation

[0030] like Figure 1-3 As shown, a battery cover appearance inspection device includes a conveyor belt 2 for conveying materials, and multiple slots 9 are evenly opened on the conveyor belt 2 along its width direction. Multiple material cylinders 4 for loading battery covers 14 are evenly arranged on one side of the conveyor belt 2, and at least one material cylinder 4 is set above the conveyor belt 2, so that the battery cover 14 in the material cylinder 4 can fall down into the slot 9 of the conveyor belt 2. Then, as the conveyor belt 2 rotates, the force of the slot 9 on the battery cover 14 can move it away from the bottom end of the material cylinder 4, so that the second to last battery cover 14 in the material cylinder 4 can fall back to the top of the conveyor belt 2. Thus, as the conveyor belt 2 moves, the battery cover 14 can fall into the slot 9 and move synchronously with the conveyor belt 2. Of course, in order to achieve the above function, the distance from the bottom end face of the material cylinder 4 to the bottom surface inside the slot 9 should be greater than the thickness of one battery cover 14 and less than the thickness of two battery covers 14.

[0031] Furthermore, a bracket 7 for mounting an industrial camera is also provided above the conveyor belt 2. The industrial camera takes pictures of the battery cover 14 passing under the bracket 7 to inspect the appearance of the battery cover 14. In actual application, the camera is electrically connected to an external controller such as a microcontroller or PLC, and the controller is connected to an external display device. Since this is a commonly used and mature technology in the field of industrial vision, the specific structure and wiring connection of the camera and controller will not be described in detail here.

[0032] like Figure 2-8 As shown in Figure 10, using the cooperation between the material cylinder 4 and the conveyor belt 2, although the battery cover 14 can be evenly placed in the slot 9 on the conveyor belt 2 for appearance inspection, when the thickness of the battery cover 14 deviates, for example, when the battery cover 14 is too thick, it will get stuck in the material cylinder 4 during use. In this case, the slot 9 cannot carry the battery cover 14 out. When the thickness of the battery cover 14 is too thin, it will not be screened out and will be conveyed along with the conveyor belt 2, thus causing defective products to be unable to be rejected during the appearance inspection process.

[0033] Therefore, in this solution, multiple protrusions 16 are fixedly connected to the bottom end face of the material cylinder 4. Preferably, the number of protrusions 16 is set to four and distributed in a circular array. A positioning component is provided below the protrusions 16, and a limiting component is assembled on the positioning component. In actual use, when the battery cover 14 slides down from inside the material cylinder 4 to the top of the conveyor belt 2, the positioning component is engaged at the joint of the two battery covers 14. When the thickness of the battery cover 14 meets the requirements, the bottom battery cover 14 can be brought out and passed over the limiting component through the slot 9 on the conveyor belt 2. When the thickness of 14 is relatively thin, the positioning component is engaged at the seam of the two battery covers 14 and will move downward a certain distance. At this time, the limiting component can limit the bottom battery cover 14. When the slot 9 on the conveyor belt 2 moves the bottom battery cover 14, due to the obstruction of the limiting component, the battery cover 14 is difficult to move out from the bottom of the material cylinder 4. Therefore, the conveyor belt 2 will drive the battery cover 14 and the material cylinder 4 to rotate during the rotation, and cause the material cylinder 4 to move away from the top of the conveyor belt 2, while the other material cylinder 4 will rotate to the top of the conveyor belt 2 to continue the operation.

[0034] In summary, this structure can be used to screen battery covers 14 that do not meet the thickness requirements, thereby preventing defective products from being sent out simultaneously with the conveyor belt 2.

[0035] The aforementioned positioning assembly includes a positioning plate 15 slidably disposed at the bottom of the boss 16. A positioning strip 22 is slidably disposed on the inner side of the positioning plate 15, and the bottom surface of the positioning strip 22 is flush with the bottom surface of the positioning plate 15. Specifically, a groove can be opened at the bottom of the positioning plate 15, and the positioning strip 22 is slidably disposed in this groove. In addition, a crossbar 21 is fixedly connected to the side wall of the groove away from the positioning strip 22. The crossbar 21 extends into the interior of the positioning strip 22 and slides with the positioning strip 22. A second spring 20 is sleeved on the outside of the crossbar 21. The two ends of the second spring 20 are fixedly connected to the inner end wall of the groove and the end face of the positioning strip 22, respectively. The side of the positioning strip 22 away from the positioning plate 15 is provided with a chamfer, so that the positioning strip 22 can be inserted into the gap between the two battery covers 14.

[0036] Furthermore, in order for the positioning plate 15 to slide up and down relative to the boss 16, a guide post 19 can be fixedly connected to the top of the positioning plate 15, and an annular plate is fixedly sleeved on the outside of the boss 16, so that the guide post 19 can pass through the annular plate and slide with it. A first spring 12 is sleeved on the outside of the guide post 19, and the two ends of the first spring 12 are fixed to the bottom surface of the annular plate and the top surface of the positioning plate 15, respectively.

[0037] The aforementioned limiting component includes a locking block 11 that rotatably engages with the positioning plate 15. One side of the locking block 11 is set as an inclined surface. Specifically, a through hole is provided on the positioning plate 15, and the locking block 11 is rotatably disposed in this through hole. In addition, a sliding rod 13 is connected between the locking block 11 and the boss 16. The bottom end of the sliding rod 13 extends into the locking block 11 and is slidably connected to it. A limiting block 25 is fixedly connected to the outer top end of the sliding rod 13. A blind hole is provided on the bottom surface of the boss 16, so that the top end of the sliding rod 13 can extend into the blind hole and form a sliding engagement with the boss 16. A spiral limiting groove 17 is provided on the inner wall of the blind hole, so that the limiting block 25 is slidably disposed in this limiting groove 17. When the sliding rod 13 moves up and down relative to the boss 16, the limiting block 25 can slide in the limiting groove 17, thereby limiting the limiting block 25 through the limiting groove 17, so that the sliding rod 13 can rotate during the up and down movement.

[0038] Furthermore, a circular hole is provided on the top surface of the locking block 11 to cooperate with the sliding rod 13. A sliding groove is symmetrically provided on the inner wall of the circular hole, and a slider 26 that slides in cooperation with the sliding groove is fixedly connected to the outer circumferential surface of the sliding rod 13. This structure enables the locking block 11 to rotate during the rotation of the sliding rod 13.

[0039] In actual use, when the thickness of the battery cover 14 is a standard value, the bottom battery cover 14 falls into the slot 9 of the conveyor belt 2, and the second to last battery cover 14 is still inside the material cylinder 4. Therefore, when the conveyor belt 2 rotates, the force exerted by the slot 9 on the battery cover 14 can cause the battery cover 14 to move out from under the material cylinder 4. At this time, the seam of the two bottom battery covers 14 is in a preset position, and the inclined surface on the block 11 is also arranged relative to the direction of the battery cover 14. Therefore, when the battery cover 14 is pulled out through the slot 9, the squeezing force of the battery cover 14 on the block 11 can cause the block 11 to slide upward along the direction of the slide bar 13, so that the battery cover 14 can pass over the block 11 and move synchronously with the conveyor belt 2.

[0040] When the bottom battery cover 14 is thinner, the positioning strip 22 will first engage at the seam between the two bottom battery covers 14 during their descent. Because the bottom battery cover 14 is thinner, the seam between the two battery covers 14 will slide downwards a greater distance relative to the conveyor belt 2 and will be closer to the conveyor belt 2 than under normal conditions. Therefore, when the positioning strip 22 engages at the seam between the two battery covers 14, it will slide downwards, thereby causing the positioning plate 15 and the sliding rod 13 to slide downwards. Since the limiting block 25 cooperates with the spiral limiting groove 17… Therefore, when the slide bar 13 slides down, it will rotate, thereby using the cooperation of the slider 26 and the groove to drive the locking block 11 to rotate, so that the inclined surface on the locking block 11 rotates away from the direction of the battery cover 14. At this time, the locking block 11 can limit the bottom battery cover 14 to prevent it from moving out from the bottom of the material cylinder 4. When the bottom battery cover 14 is thick, it will be stuck inside the material cylinder 4. Therefore, using the above structure, when the thickness of the battery cover 14 does not meet the requirements, whether it is too thick or too thin, the battery cover 14 will be stuck under the material cylinder 4 and will not move synchronously with the groove 9 on the conveyor belt 2.

[0041] When the bottom battery cover 14 is stuck between the bottom of the material cylinder 4 and the slot 9 of the conveyor belt 2, as the conveyor belt 2 continues to rotate, the traction of the bottom battery cover 14 by the slot 9 can drive the material cylinder 4 to rotate, and eventually the material cylinder 4 will move out of the conveyor belt 2, and the new material cylinder 4 will rotate to the top of the conveyor belt 2 for operation.

[0042] In summary, this device, through the action of the locking block 11, can lock the battery cover 14 between the lower part of the material cylinder 4 and the slot 9 of the conveyor belt 2 when the thickness does not meet the requirements. This prevents the battery cover 14 with the non-compliant thickness from moving synchronously with the conveyor belt 2. Therefore, this structure can automatically detect the thickness of the battery cover 14 during the feeding process. Furthermore, when there is an error in the thickness of the battery cover 14, the material cylinder 4 can be rotated to one side of the conveyor belt 2 by the traction force of the conveyor belt 2 itself, so that the new material cylinder 4 can be rotated to the top of the conveyor belt 2 for operation.

[0043] like Figure 1 As shown, rollers are provided at both ends of the inner side of the conveyor belt 2 so that the conveyor belt 2 can be fitted onto the rollers. The front and rear ends of the rollers are fixedly connected to round shafts. A frame is provided at the round shaft so that the round shaft passes through the frame and is rotatably connected to it, thereby completing the installation of the conveyor belt 2. One of the round shafts is connected to an external motor drive to drive the conveyor belt 2 to rotate.

[0044] In order to support the conveyor belt 2, a support plate 10 is provided at the top of the inside of the conveyor belt 2, and side plates 1 are fixedly connected to the front and rear sides of the frame. The support plate 10 is fixedly connected to the side plates 1. The support plate 10 can support the conveyor belt 2, so that the battery cover 14 can be stably placed above the conveyor belt 2.

[0045] The bracket 7 is fixedly connected to the side plate 1, and the bracket 7 is also provided with an electric push rod 27. The output end of the electric push rod 27 is connected to the push plate 8, and the electric push rod 27 is electrically connected to the controller. When the camera detects that there is a defect in the appearance of the battery cover 14, the electric push rod 27 is used to drive the push rod forward, thereby pushing out the defective battery cover 14. Of course, the control circuit and other technical means commonly used in the field of uniform electrical engineering are not described in detail here.

[0046] like Figure 1 , 9 As shown, a support platform 28 is fixedly connected to the side plate 1, a fixed shaft 5 is fixedly connected to the top surface of the support platform 28, and a sleeve 6 is sleeved on the outside of the fixed shaft 5.

[0047] Furthermore, a groove is provided on the outer circumferential surface of the fixed shaft 5, and an installation hole is provided on the inner wall of the sleeve 6. A protrusion 24 is slidably provided in the installation hole, and the protrusion 24 cooperates with the groove. In addition, a third spring 23 is provided in the installation hole, and the two ends of the third spring 23 are fixedly connected to the protrusion 24 and the side opposite to the groove, respectively.

[0048] Furthermore, a support rod is fixedly connected between the material cylinder 4 and the sleeve 6. In actual application, the support rod, sleeve 6, and material cylinder 4 can all be installed by means of threaded connection. The top surfaces of the support platform 28, side plate 1, and conveyor belt 2 are flush, which makes it easy for the new material cylinder 4 to rotate to the top of the conveyor belt 2 for operation.

[0049] The sleeve 6 can be positioned by the cooperation of the protrusion 24 and the groove. When the material cylinder 4 is rotated by the slot 9, the sleeve 6 can be rotated on the outside of the fixed shaft 5, so as to alternate multiple material cylinders 4.

[0050] like Figure 2 As shown, a pressure block 3 is slidably arranged inside the material cylinder 4. Specifically, a guide strip 18 is fixedly connected to the outer circumferential surface of the pressure block 3, and a guide groove that slides with the guide strip 18 is opened on the inner wall of the material cylinder 4. The pressure block 3 is arranged above the multiple battery covers 14. The weight of the pressure block 3 facilitates the downward sliding of the multiple battery covers 14 inside the material cylinder 4.

Claims

1. A battery cover appearance inspection device, comprising a conveyor belt, wherein a plurality of slots are uniformly formed along the width of the conveyor belt, and a plurality of material cylinders for loading battery covers are uniformly arranged on one side of the conveyor belt, characterized in that: Multiple bosses are fixedly connected to the bottom end face of the material cylinder, and a positioning component is provided below the bosses, and a limit component is assembled on the positioning component. When the positioning component engages with the seam between the two battery covers and moves downward, the bottommost battery cover engages with the limiting component, and the rotation of the conveyor belt drives the material cylinder to rotate through the slot and is offset from the conveyor belt. The positioning component includes a positioning plate slidably disposed on the bottom of the boss, a positioning strip slidably disposed on the inner side of the positioning plate, and the bottom surface of the positioning strip is flush with the bottom surface of the positioning plate. A groove is formed on the bottom of the positioning plate, and the positioning strip is slidably disposed in the groove. A crossbar is fixedly connected to the side wall of the groove away from the positioning strip. The crossbar extends into the positioning strip and slides with the positioning strip. A second spring is sleeved on the outer side of the crossbar. The two ends of the second spring are fixedly connected to the inner end wall of the groove and the end face of the positioning strip, respectively. The limiting component includes a locking block that rotatably engages with a positioning plate. One side of the locking block is set as an inclined surface. A through hole is formed on the positioning plate. The locking block is rotatably disposed within the through hole. A sliding rod is provided between the locking block and the boss. The bottom end of the sliding rod extends into the locking block and is slidably connected to it. A limiting block is fixedly connected to the outer top end of the sliding rod. A blind hole is formed on the bottom surface of the boss. A spiral limiting groove is formed on the inner wall of the blind hole. The limiting block is slidably disposed within the limiting groove. A circular hole that engages with the sliding rod is formed on the top surface of the locking block. A sliding groove is symmetrically formed on the inner wall of the circular hole. A slider that slidably engages with the sliding groove is fixedly connected to the outer circumferential surface of the sliding rod.

2. The battery cover appearance inspection device according to claim 1, characterized in that: A guide post is fixedly connected to the top of the positioning plate, and an annular plate is fixedly sleeved on the outer side of the boss. The guide post passes through the annular plate and slides with it. A first spring is sleeved on the outer side of the guide post, and the two ends of the first spring are fixed to the bottom surface of the annular plate and the top surface of the positioning plate, respectively.

3. The battery cover appearance inspection device according to claim 1, characterized in that: A support plate is provided at the top of the inside of the conveyor belt, and a support platform parallel to it is provided on the outside of the conveyor belt.

4. The battery cover appearance inspection device according to claim 3, characterized in that: A fixed shaft is fixedly connected to the top surface of the support platform. A sleeve is fitted on the outer side of the fixed shaft. A groove is opened on the outer circumferential surface of the fixed shaft. An installation hole is opened on the inner wall of the sleeve. A protrusion is slidably arranged in the installation hole. The protrusion cooperates with the groove. A third spring is arranged in the installation hole.

5. The battery cover appearance inspection device according to claim 4, characterized in that: A support rod is fixedly connected between the material cylinder and the sleeve, and the support rod is threadedly connected to both the sleeve and the material cylinder.

6. The battery cover appearance inspection device according to claim 1, characterized in that: A pressure block is slidably disposed inside the material cylinder, and a guide strip is fixedly connected to the outer circumferential surface of the pressure block. A guide groove is provided on the inner wall of the material cylinder to slide and cooperate with the guide strip.

7. The battery cover appearance inspection device according to claim 1, characterized in that: A support frame is provided on the outer side of the conveyor belt, and an electric push rod is provided on the support frame. The output end of the electric push rod is connected to a push plate.

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