Anti-spilling sealing skirt edge structure of grain conveyor

Abstract

The utility model relates to the technical field of grain conveying, and discloses an anti-spilling sealing skirt edge structure of a grain conveyor, which comprises two support frames, the two support frames are arranged at an interval, the top surfaces of the support frames are fixedly connected with racks, a conveying part is arranged between the two racks, a plurality of support columns are fixedly connected inside the racks, and the support columns are fixedly connected with the top surfaces of the support frames. Through the mutual cooperative use of a second threaded rod, a fixed box, a driving block, a sliding groove, a reset spring, a movable column, a guide rod, a lifting plate, a movable strip, a movable plate and a bolt, the double-seal polyurethane apron board can move downwards and be tightly attached to the conveying belt; according to the anti-spilling device for grain conveying, the first threaded rod, the lifting strip, the limiting rod, the lifting plate and the extrusion rod are matched for use, so that the wear-resisting block of the double-sealing polyurethane apron board can be attached to the conveying belt, the double-sealing polyurethane apron board and the wear-resisting block of the double-sealing polyurethane apron board are attached to the conveying belt, and therefore the anti-spilling effect of grain conveying is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of grain conveying, more particularly to a grain conveyor anti-overflow sealing skirt structure. BACKGROUND

[0002] The grain conveyor is a special device used in the process of grain processing, storage and transportation, mainly used for efficiently and continuously conveying grain and other bulk materials between different locations, usually by a belt.

[0003] At present, when the conveyor is conveying grain, the grain may overflow, so a double-sealing polyurethane skirt is usually installed on the belt of the conveyor to prevent the grain from overflowing during conveying. However, the double-sealing polyurethane skirt needs to be attached to the moving belt during use, and long-term use will cause wear of the double-sealing polyurethane skirt, resulting in insufficient tightness of the double-sealing polyurethane skirt and the belt, which may cause the grain to overflow from the gap, affecting the anti-overflow effect of grain conveying. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides a grain conveyor anti-overflow sealing skirt structure to solve the problems in the above background art.

[0005] The utility model provides the following technical scheme:

[0006] A grain conveyor anti-overflow sealing skirt structure comprises two support frames, the two support frames are arranged at intervals, the top surface of the support frame is fixedly connected with a rack, a conveying component is arranged between the two racks, a plurality of support columns are fixedly connected inside the rack, a fixed frame is fixedly connected between the plurality of support columns, a feeding frame is fixedly connected to the top surface of the fixed frame, an adjusting component is arranged on one side of the fixed frame, a driving component is connected to the adjusting component, and a rotating component is arranged below the fixed frame.

[0007] The adjusting component comprises an adjusting box, the adjusting box is fixedly connected to one side of the fixed frame, a moving column is arranged inside the adjusting box, one end of the moving column extends to the outside of the adjusting box, a sliding groove is formed in one side of the moving column, and a driving block is slidably connected inside the sliding groove.

[0008] Further, the adjusting part further comprises two guide rods, both of which are fixedly connected to the inner top wall of the adjusting box, the top surface of the moving column is provided with two circular grooves, the guide rods are in sliding connection with the circular grooves, the top surface of the moving column is fixedly connected with a return spring, the return spring is fixedly connected with the inner top wall of the adjusting box, the inside of the fixed frame is provided with two moving plates, the two sides of the fixed frame are respectively provided with moving strips, the inside of the moving plate and the moving strip is provided with a double-sealing polyurethane skirt plate, one side of the moving strip is fixedly connected with a lifting plate, and one end of the moving column is fixedly connected with the lifting plate.

[0009] Further, the adjusting part further comprises a plurality of limiting grooves, the plurality of limiting grooves are arranged on the two sides of the inside of the fixed frame, the inside of the limiting groove is in sliding connection with a limiting block, the limiting block is fixedly connected with the moving plate, a plurality of threaded holes are arranged on one side of the moving plate, the moving strip and the double-sealing polyurethane skirt plate, and the inside of the threaded hole is in threaded connection with a bolt.

[0010] Further, the driving part comprises a fixed box, which is fixedly connected to one side of the adjusting box, one side of the fixed box is provided with a threaded hole, the inside of the threaded hole is in threaded connection with a second threaded rod, and the second threaded rod is in rotary connection with the driving block through a bearing.

[0011] Further, the driving part further comprises a blocking strip, which is fixedly connected to the inner bottom wall of the adjusting box, and the bottom surface of the driving block is provided with a sliding groove, and the blocking strip is in sliding connection with the sliding groove.

[0012] Further, the conveying part comprises two rollers, both of which are arranged between the two racks, both ends of one of the rollers are in rotary connection with the inside of the rack, one side of the rack is fixedly connected with a servo motor, the output end of the servo motor is fixedly connected with the other roller, one end of the other roller is in rotary connection with the inside of the rack, a conveying belt is connected between the two rollers, a plurality of fixed strips are fixedly connected to one side of the rack, every two fixed strips form a group, a plurality of auxiliary rollers are rotatably connected between the fixed strips in each group, a fixed block is fixedly connected to the bottom surface of the rack, a plurality of supporting rollers are rotatably connected between the two fixed blocks, and the conveying belt passes above the supporting rollers.

[0013] Further, the rotating part further comprises: a lifting strip, the lifting strip is arranged on the top surface of the lifting plate, the bottom surface of the lifting strip is fixedly connected with a plurality of extrusion rods, the outer wall of the wear-resistant block of the double-sealing polyurethane apron is provided with a plurality of circular grooves, one end of the extrusion rod penetrates through the lifting strip and extends into the circular groove, the top surface of the lifting plate is fixedly connected with two limiting rods, the top surface of the lifting strip is provided with two circular holes, the lifting strip is slidably connected with the limiting rod through the circular hole, the top surface of the lifting strip is provided with a threaded hole, and a first threaded rod is screwed in the threaded hole.

[0014] The technical effects and advantages of the present application are as follows:

[0015] Through the cooperation of the feeding frame, the conveying belt, the baffle, the servo motor, the roller, the auxiliary roller and the carrier roller, the grain can be conveyed. Through the cooperation of the second threaded rod, the fixed box, the driving block, the sliding groove, the reset spring, the moving column, the guide rod, the lifting plate, the moving strip, the moving plate and the bolt, the double-sealing polyurethane apron can be moved downward and tightly attached to the conveying belt. Through the cooperation of the first threaded rod, the lifting strip, the limiting rod, the lifting plate and the extrusion rod, the extrusion on the wear-resistant block of the double-sealing polyurethane apron can be released before the double-sealing polyurethane apron moves, so that the double-sealing polyurethane apron is prevented from being blocked when moving downward. After the double-sealing polyurethane apron moves, the extrusion rod can press the wear-resistant block of the double-sealing polyurethane apron, so that the wear-resistant block of the double-sealing polyurethane apron is attached to the conveying belt, the sealing effect of the wear-resistant block of the double-sealing polyurethane apron and the conveying belt is ensured, and compared with the prior art, the double-sealing polyurethane apron can be moved after being worn, so that the double-sealing polyurethane apron and the wear-resistant block of the double-sealing polyurethane apron are attached to the conveying belt, the sealing effect is ensured, and the anti-spilling effect of grain conveying is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0017] Figure 2 It is a schematic diagram of the fixed frame structure of the present application;

[0018] Figure 3 It is a schematic diagram of the partial structure of the present application Figure 1 A;

[0019] Figure 4 It is a schematic diagram of the partial structure of the present application Figure 1 B;

[0020] Figure 5This is a schematic diagram of the regulating box structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the drive block structure of this utility model;

[0022] Figure 7 This is a schematic diagram of the movable plate structure of this utility model;

[0023] Figure 8 This utility model Figure 7 A schematic diagram of the local structure of C.

[0024] The attached diagram is labeled as follows: 1. Support frame; 2. Machine frame; 3. Roller; 4. Support column; 5. Fixed frame; 6. Feed frame; 7. Servo motor; 8. Fixed bar; 9. Auxiliary roller; 10. Idler roller; 11. Fixed block; 12. Baffle; 13. Moving plate; 14. Moving bar; 15. Bolt; 16. Lifting plate; 17. Double-sealed polyurethane skirt; 18. Extrusion rod; 19. Limiting block; 20. Lifting bar; 21. Limiting rod; 22. Limiting groove; 23. Sliding groove; 24. Adjustment box; 25. Moving column; 26. First threaded rod; 27. Guide rod; 28. Return spring; 29. ​​Conveyor belt; 30. Drive block; 31. Second threaded rod; 32. Fixed box; 33. Stop bar; 34. Slide groove. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments. However, those skilled in the art should understand that the detailed description given here with reference to the accompanying drawings is for better explanation. The structure of the present invention may exceed the limited embodiments described herein. Some equivalent alternatives or common means will not be described in detail here, but they still fall within the protection scope of this application.

[0026] Figures 1-8 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figure 1 ~Appendix Figure 8 The present invention will be further described below.

[0027] The utility model provides a kind of grain conveyor anti-overflow sealing apron structure, comprising: two support frames 1, two the support frame 1 interval arrangement, the top surface of support frame 1 is fixedly connected with rack 2, and conveying component is equipped between two racks 2, the inside of rack 2 is fixedly connected with several struts 4, several struts 4 are fixedly connected with fixed frame 5, the top surface of fixed frame 5 is fixedly connected with feed frame 6, one side of fixed frame 5 is equipped with adjusting component, adjusting component is connected with driving component, the below of fixed frame 5 is equipped with rotating component, adjusting component includes: adjusting box 24, adjusting box 24 is fixedly connected in one side of fixed frame 5, the inside of adjusting box 24 is equipped with moving column 25, one end of moving column 25 extends to the outside of adjusting box 24, one side of moving column 25 is equipped with sliding slot 34, sliding slot 34 is slidably connected with driving block 30, one end of driving block 30 extends to the outside of adjusting box 24.

[0028] Specifically, the adjusting component further includes: two guide rods 27, both of which are fixedly connected to the inner top wall of the adjusting box 24; the top surface of the moving column 25 is provided with two circular grooves, and the guide rods 27 are slidably connected to the circular grooves; the top surface of the moving column 25 is fixedly connected with a return spring 28, which is fixedly connected to the inner top wall of the adjusting box 24; the inside of the fixed frame 5 is provided with two moving plates 13; both sides of the fixed frame 5 are respectively provided with moving strips 14; the inside of the moving plate 13 and the moving strip 14 is provided with a double-sealing polyurethane apron 17; one side of the moving strip 14 is fixedly connected with a lifting plate 16; one end of the moving column 25 is fixedly connected with the lifting plate 16.

[0029] In the present embodiment, as the driving block 30 moves, the slope of the inclined surface where the driving block 30 contacts the sliding slot 34 gradually decreases, at which point the potential energy of the return spring 28 is released, causing the moving column 25 to move downward. When the moving column 25 moves, the guide rods 27 can guide the moving column 25, preventing it from deviating when moving downward.

[0030] Specifically, the adjusting component further includes: a plurality of limiting grooves 22, which are T-shaped grooves; the plurality of limiting grooves 22 are arranged on both sides of the inside of the fixed frame 5; the inside of the limiting groove 22 is slidably connected with a limiting block 19, which is a T-shaped block; the limiting block 19 is fixedly connected with the moving plate 13; a plurality of threaded holes are arranged on one side of the moving plate 13, the moving strip 14, and the double-sealing polyurethane apron 17; the inside of the threaded hole is threadedly connected with a bolt 15; the bottom surface of the fixed frame 5 is fixedly connected with a baffle 12, which is made of polyurethane material.

[0031] In the present embodiment, when the moving plate 13 moves, the moving plate 13 slides within the limiting groove 22 along with the limiting block 19, preventing the moving plate 13 from separating from the fixed frame 5 and ensuring the stability of the movement of the fixed frame 5.

[0032] Specifically, the driving component comprises a fixed box 32 fixedly connected to one side of the adjusting box 24, one side of the fixed box 32 is provided with a threaded hole, a second threaded rod 31 is threadedly connected in the threaded hole, the second threaded rod 31 is rotatably connected with the driving block 30 through a bearing, and the driving component further comprises a blocking strip 33 fixedly connected to the inner bottom wall of the adjusting box 24, and the bottom surface of the driving block 30 is provided with a sliding groove 23, and the blocking strip 33 is slidably connected with the sliding groove 23.

[0033] In the embodiment, when the driving block 30 moves towards the inside of the fixed box 32, the driving block 30 slides on the blocking strip 33 through the sliding groove 23, when the inner side wall of the sliding groove 23 is attached to the driving block 30, the driving block 30 cannot move, and the state of the driving block 30 is that one side of the driving block 30 is flush with one side of the moving column 25, so as to ensure the moving range of the moving column 25, because the long-wearing place of the double-sealing polyurethane apron 17 is mainly the contact surface attached to the conveying belt 29, when the double-sealing polyurethane apron 17 is worn to a certain degree, the wear-resistant block of the double-sealing polyurethane apron 17 is separated from the double-sealing polyurethane apron 17, and the double-sealing polyurethane apron 17 does not have the double-layer sealing effect, therefore, when the driving block 30 cannot move, it means that the double-sealing polyurethane apron 17 needs to be replaced, the worker only needs to rotate out the plurality of bolts 15, so that the double-sealing polyurethane apron 17, the moving strip 14 and the moving plate 13 are separated, and the double-sealing polyurethane apron 17 can be replaced.

[0034] Specifically, the conveying component comprises two rollers 3 arranged between the two racks 2, the two ends of one of the rollers 3 are rotatably connected to the inside of the rack 2, one side of the rack 2 is fixedly connected with a servo motor 7, the output end of the servo motor 7 is fixedly connected with the other roller 3, one end of the other roller 3 is rotatably connected to the inside of the rack 2, the conveying belt 29 is connected between the two rollers 3, a plurality of fixed strips 8 are fixedly connected to one side of the rack 2, every two fixed strips 8 form a group, a plurality of auxiliary rollers 9 are rotatably connected between the fixed strips 8 in each group, the bottom surface of the rack 2 is fixedly connected with two fixed blocks 11, the two fixed blocks 11 are rotatably connected with a supporting roller 10, and the conveying belt 29 passes above the supporting roller 10.

[0035] In the embodiment, the staff can pour the grain from the feeding frame 6 onto the conveying belt 29, and the baffle 12 can prevent the grain from spilling when pouring the grain, and then the output end of the servo motor 7 drives one of the rollers 3 to rotate and drives the conveying belt 29 to rotate, so that the other roller 3 rotates, and the auxiliary roller 9 can assist the conveying belt 29 to move, and the supporting roller 10 can support the conveying belt 29, so as to ensure the stability of the rotation of the conveying belt 29, and the two double-seal polyurethane skirts 17 can seal the two sides of the conveying belt 29 to prevent the grain from spilling during transportation.

[0036] Specifically, the rotating part further comprises: a lifting strip 20 arranged on the top surface of the lifting plate 16, the bottom surface of the lifting strip 20 is fixedly connected with a plurality of extrusion rods 18, the wear-resistant block outer wall of the double-seal polyurethane skirt 17 is provided with a plurality of circular grooves, one end of the extrusion rod 18 extends into the circular groove through the lifting strip 20, the top surface of the lifting plate 16 is fixedly connected with two limiting rods 21, the top surface of the lifting strip 20 is provided with two circular holes, the lifting strip 20 is slidably connected with the limiting rod 21 through the circular hole, and the top surface of the lifting strip 20 is provided with a threaded hole, and a first threaded rod 26 is threadedly connected in the threaded hole. One end of the first threaded rod 26 is rotatably connected with the lifting plate 16 through a bearing.

[0037] In the embodiment, the staff can rotate the first threaded rod 26 clockwise, because the first threaded rod 26 is threadedly connected with the lifting strip 20, and the lifting strip 20 is limited from rotating by the limiting rod 21, so when the first threaded rod 26 rotates, the lifting strip 20 is driven to convert the rotation into linear motion and moves upward, so that the lifting strip 20 can drive the extrusion rod 18 to move upward, release the extrusion on the wear-resistant block of the double-seal polyurethane skirt 17, and prevent the double-seal polyurethane skirt 17 from being blocked when moving downward, and then the staff rotates the first threaded rod 26 counterclockwise, so that the first threaded rod 26 drives the lifting strip 20 to drive the extrusion rod 18 to move downward, so that the extrusion rod 18 presses the wear-resistant block of the double-seal polyurethane skirt 17, so that the wear-resistant block of the double-seal polyurethane skirt 17 is attached to the conveying belt 29, and the sealing effect of the wear-resistant block of the double-seal polyurethane skirt 17 and the conveying belt 29 is ensured.

[0038] The utility model discloses a working principle and use flow: when using, staff can pour grain from the inside of feeding frame 6 to the conveyer belt 29, baffle 12 will block the grain at this moment, prevent spilling when pouring grain, then the output of servo motor 7 drives one of drum 3 rotation and drives conveyer belt 29 rotation, to make another drum 3 follow rotation, when conveyer belt 29 rotates, auxiliary roll 9 can assist conveyer belt 29 and move, and the supporting roller 10 can support conveyer belt 29 to guarantee the stability of conveyer belt 29 rotation, when conveyer belt 29 conveys grain, the both sides of conveyer belt 29 are sealed to two double -sealed polyurethane aprons 17, prevent spilling when transportation, when conveyer belt 29 wears, servo motor 7 is closed at this moment, stops transportation, first, staff can rotate first threaded rod 26 clockwise, because first threaded rod 26 is connected with the lift bar 20 screw thread, and the lift bar 20 is restricted by the limiting rod 21 and can not rotate, therefore when first threaded rod 26 rotates, will be through the bearing in the lift plate 16 and rotate, and then drive the lift bar 20 to convert into linear motion and move upwards from rotation, make the lift bar 20 can drive extrusion rod 18 and move upwards, remove the extrusion of wear -resistant block of double -sealed polyurethane apron 17, prevent double -sealed polyurethane apron 17 from being blocked when moving downwards, then staff rotates second threaded rod 31 clockwise,The second threaded rod 31 rotates and gradually moves from the inside of the fixed box 32 to the outside, at this time, the second threaded rod 31 drives the driving block 30 to enter the inside of the fixed box 32, with the movement of the driving block 30, the slope of the driving block 30 in contact with the sliding groove 34 gradually becomes smaller, at this time, the potential energy of the reset spring 28 is released to drive the moving column 25 to move downward, and when the moving column 25 moves, the guide rod 27 can guide the moving column 25 to prevent the moving column 25 from deviating when moving downward, and the moving column 25 moves downward to drive the lifting plate 16 and the moving strip 14 to move downward, since the double-sealing polyurethane skirt plate 17, the moving strip 14 and the moving plate 13 are connected by the bolt 15, when the moving strip 14 moves downward, the double-sealing polyurethane skirt plate 17 and the moving plate 13 are driven to move downward synchronously, so that the double-sealing polyurethane skirt plate 17 is tightly attached to the conveyor belt 29, the sealing effect of the double-sealing polyurethane skirt plate 17 and the conveyor belt 29 is ensured, the effect of adjusting the movement of the double-sealing polyurethane skirt plate 17 is achieved, and when the moving plate 13 moves downward, the moving plate 13 slides in the limiting groove 22 through the limiting block 19, since the limiting block 19 is a T-shaped block and the limiting groove 22 is a T-shaped groove, the limiting block 19 does not move out of the inside of the limiting groove 22, so that the stability of the moving plate 13 moving downward is ensured, then the worker rotates the first threaded rod 26 counterclockwise, so that the first threaded rod 26 drives the lifting strip 20 to drive the extrusion rod 18 to move downward, so that the extrusion rod 18 presses the wear-resistant block of the double-sealing polyurethane skirt plate 17, so that the wear-resistant block of the double-sealing polyurethane skirt plate 17 is attached to the conveyor belt 29, and the sealing effect of the wear-resistant block of the double-sealing polyurethane skirt plate 17 and the conveyor belt 29 is ensured.

[0039] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content to obtain equivalent embodiments. However, any simple modification, equivalent change and modification of the above embodiments made according to the technical essence of the present application without departing from the technical solution of the present application still falls within the protection scope of the present application.

Claims

1. A spill-proof sealing skirt structure for a grain conveyor, characterized in that, include: Two support frames (1) are spaced apart. A frame (2) is fixedly connected to the top surface of the support frame (1). A conveying component is provided between the two frames (2). Several pillars (4) are fixedly connected inside the frame (2). A fixed frame (5) is fixedly connected between the several pillars (4). A feeding frame (6) is fixedly connected to the top surface of the fixed frame (5). An adjusting component is provided on one side of the fixed frame (5). A driving component is connected to the adjusting component. A rotating component is provided below the fixed frame (5). The adjusting component includes: an adjusting box (24), which is fixedly connected to one side of the fixed frame (5). The adjusting box (24) has a movable column (25) inside, one end of which extends to the outside of the adjusting box (24). A sliding groove (34) is provided on one side of the movable column (25). A driving block (30) is slidably connected inside the sliding groove (34), one end of which extends to the outside of the adjusting box (24).

2. The anti-spillage sealing skirt structure for a grain conveyor according to claim 1, characterized in that, The adjustment component further includes: two guide rods (27), both of which are fixedly connected to the inner top wall of the adjustment box (24); two circular grooves are opened on the top surface of the moving column (25); the guide rods (27) are slidably connected to the circular grooves; a return spring (28) is fixedly connected to the top surface of the moving column (25); the return spring (28) is fixedly connected to the inner top wall of the adjustment box (24); two moving plates (13) are provided inside the fixed frame (5); moving strips (14) are provided on both sides of the fixed frame (5); double-sealed polyurethane skirts (17) are provided inside the moving plates (13) and the moving strips (14); a lifting plate (16) is fixedly connected to one side of the moving strip (14); and one end of the moving column (25) is fixedly connected to the lifting plate (16).

3. The anti-spillage sealing skirt structure for a grain conveyor according to claim 2, characterized in that, The adjusting component also includes: several limiting grooves (22), which are all opened on both sides of the inside of the fixed frame (5). A limiting block (19) is slidably connected inside the limiting groove (22). The limiting block (19) is fixedly connected to the moving plate (13). Several threaded holes are opened on one side of the moving plate (13), the moving strip (14) and the double-sealed polyurethane skirt (17). Bolts (15) are threaded inside the threaded holes. A baffle (12) is fixedly connected to the bottom surface of the fixed frame (5).

4. The anti-spillage sealing skirt structure for a grain conveyor according to claim 1, characterized in that, The driving component includes: a fixed box (32), which is fixedly connected to one side of the regulating box (24). A threaded hole is provided on one side of the fixed box (32), and a second threaded rod (31) is threadedly connected inside the threaded hole. The second threaded rod (31) is rotatably connected to the driving block (30) through a bearing.

5. The anti-spillage sealing skirt structure for a grain conveyor according to claim 4, characterized in that, The driving component further includes a baffle (33), which is fixedly connected to the inner bottom wall of the regulating box (24). The bottom surface of the driving block (30) is provided with a sliding groove (23), and the baffle (33) is slidably connected to the sliding groove (23).

6. The anti-spillage sealing skirt structure for a grain conveyor according to claim 1, characterized in that, The conveying component includes: two rollers (3), the two rollers (3) are located between the two frames (2), the two ends of one roller (3) are rotatably connected to the inside of the frame (2), a servo motor (7) is fixedly connected to one side of the frame (2), the output end of the servo motor (7) is fixedly connected to the other roller (3), one end of the other roller (3) is rotatably connected to the inside of the frame (2), a conveyor belt (29) is connected between the two rollers (3), a number of fixing strips (8) are fixedly connected to one side of the frame (2), each pair of fixing strips (8) is a group, a number of auxiliary rollers (9) are rotatably connected between each group of fixing strips (8), a fixing block (11) is fixedly connected to the bottom surface of the frame (2), a support roller (10) is rotatably connected between two fixing blocks (11), and the conveyor belt (29) passes over the support roller (10).

7. The anti-spillage sealing skirt structure for a grain conveyor according to claim 2, characterized in that, The rotating component further includes: a lifting bar (20), which is located on the top surface of the lifting plate (16). Several extrusion rods (18) are fixedly connected to the bottom surface of the lifting bar (20). Several circular grooves are opened on the outer wall of the wear-resistant block of the double-sealed polyurethane skirt (17). One end of the extrusion rod (18) passes through the lifting bar (20) and extends into the circular groove. Two limiting rods (21) are fixedly connected to the top surface of the lifting plate (16). Two circular holes are opened on the top surface of the lifting bar (20). The lifting bar (20) is slidably connected to the limiting rods (21) through the circular holes. A threaded hole is opened on the top surface of the lifting bar (20). A first threaded rod (26) is threadedly connected to the threaded hole. One end of the first threaded rod (26) is rotatably connected to the lifting plate (16) through a bearing.

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