Soil discharging device for mining industry

Abstract

The utility model relates to a dumping device for mining industry, which comprises a belt conveyor, a screening part and a rack, a plurality of screening holes for screening soil and stones are formed on the screening part, and the rack is used for supporting the screening part right above a feeding end of a conveying belt of the belt conveyor. Due to the adoption of the technical scheme, the soil discharging device for the mining industry can screen out part of larger stones, and can reduce larger impact force generated by the stones on the conveying belt when the conveying belt is used for conveying soil and stones, so that the possibility that the conveying belt is damaged is reduced.

Description

Technical Field

[0001] This utility model relates to the field of mineral extraction technology, specifically to a soil dumping device for mining. Background Technology

[0002] Mining refers to the extraction of naturally occurring minerals, such as solids (e.g., coal and minerals), liquids (e.g., crude oil), or gases (e.g., natural gas). The main operations of open-pit mining include drilling, blasting, loading, transportation, and dumping. Dumping is a crucial part of these operations, referring to the removal of soil and rocks from the mining site to a dumping ground.

[0003] Currently, belt conveyors are commonly used in spoil disposal operations to transport soil and rocks from mining sites to spoil heaps. When using belt conveyors for spoil disposal, a loader is needed to shovel the soil and rocks from the mining site onto the conveyor belt. As the soil and rocks fall from the loader's bucket onto the conveyor belt, larger rocks can exert a significant impact on the conveyor belt, easily damaging it. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a soil dumping device for the mining industry, so as to solve the technical problem that when soil and rocks fall from the bucket of a loader onto the conveyor belt, larger rocks can easily generate a large impact force on the conveyor belt and easily damage the conveyor belt.

[0005] This utility model is achieved through the following technical solution:

[0006] A soil dumping device for mining includes a belt conveyor, a screening section, and a frame. The screening section has multiple sieve holes for screening soil and rock. The frame supports the screening section directly above the feeding end of the conveyor belt of the belt conveyor.

[0007] Furthermore, the screening section is slidably connected to the frame along the length of the conveyor belt.

[0008] Furthermore, it also includes a reciprocating drive mechanism, which is mounted on the frame and is used to drive the screening section to slide back and forth along the length of the conveyor belt.

[0009] Furthermore, the reciprocating drive mechanism includes a motor, an elliptical disk, and a helical spring. The motor is fixed on the frame and located on the side of the screening section facing away from the output end of the conveyor belt. The output shaft of the motor is perpendicular to the length direction of the conveyor belt. The motor is fixedly connected to the middle of the elliptical disk. The distance from the center of the elliptical disk to the side of the screening section facing away from the output end of the conveyor belt is greater than the length of the semi-minor axis of the elliptical disk and less than the length of the semi-major axis of the elliptical disk. One end of the helical spring is fixedly connected to the frame, and the other end abuts against the side of the screening section facing the output end of the conveyor belt.

[0010] Furthermore, the frame is provided with a slide rail, which is arranged along the length of the conveyor belt. The screening section is provided with a slider at a position corresponding to the slide rail. The lower side of the slider is recessed upward to form a groove, which is slidably engaged with the slide rail.

[0011] Furthermore, the opening size of the chute is smaller than the cavity size of the chute.

[0012] Furthermore, the screening unit includes a box and a sieve plate. The box has openings at both the top and bottom. The sieve plate is horizontally arranged on the box and located directly above the opening at the top of the box. The projection of the opening at the bottom of the box on a horizontal plane is located within the range of the projection of the upper side of the conveyor belt on the horizontal plane. A plurality of sieve holes are formed on the sieve plate.

[0013] Furthermore, one end of the screen plate is rotatably connected to the housing, the edge of the screen plate at one end is located outside the long edge of the conveyor belt, the rotation center line of the screen plate is set parallel to the length direction of the conveyor belt, and the screening part also includes a lifting part for lifting the other end of the screen plate opposite to the one end.

[0014] Furthermore, the sieve plate includes a square frame and multiple connecting rods, all of which are detachably and fixedly connected to the square frame. The multiple connecting rods are arranged sequentially at intervals along the length of the conveyor belt, and the interval between each pair of adjacent connecting rods is the sieve hole.

[0015] Furthermore, the square frame includes a first connecting plate, a second connecting plate, a third connecting plate, and a fourth connecting plate. The first connecting plate and the second connecting plate are arranged along the length direction of the conveyor belt, and the third connecting plate and the fourth connecting plate are arranged along the width direction of the conveyor belt. The two ends of the first connecting plate are fixedly connected to one end of the third connecting plate and one end of the fourth connecting plate, respectively. The other ends of the third connecting plate and the other ends of the fourth connecting plate are fixedly connected to the two ends of the second connecting plate, respectively. The upper side of the first connecting plate is recessed downward to form a first groove corresponding to the position of each connecting rod. The upper side of the second connecting plate is recessed downward to form a second groove corresponding to the position of each connecting rod. The two ends of the connecting rod are located in the corresponding first groove and the corresponding second groove, respectively. Both ends of the connecting rod are provided with external threads, and both ends of the connecting rod are screwed with nuts. The two nuts abut against the outer sides of the first connecting plate and the second connecting plate, respectively.

[0016] The beneficial effects of this utility model are as follows:

[0017] The mining waste disposal device described in this utility model can screen out some of the larger stones. When using a conveyor belt to transport soil and rocks, it can reduce the impact force of the stones on the conveyor belt, reduce the possibility of damage to the conveyor belt, and improve the service life of the conveyor belt.

[0018] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the mining waste disposal device of this utility model as viewed from one perspective;

[0020] Figure 2 This is a schematic diagram of the structure of the mining waste disposal device of this utility model when viewed from another perspective.

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 This is a schematic diagram of the screen plate in the mining waste disposal device of this utility model.

[0023] In the diagram: 1. Screening section; 2. Frame; 3. Belt conveyor; 4. Motor; 5. Elliptical disc; 6. Helical spring; 7. Slide rail; 8. Slider; 9. Groove size; 10. Groove cavity size; 11. Box body; 12. Screen plate; 13. Screen hole; 14. Conveyor belt; 15. Fourth connecting block; 16. Fifth connecting block; 17. Lifting section; 18. Electric push rod; 19. First rotating shaft; 20. First ear plate; 21. Square frame; 22. Connecting rod; 23. First connecting plate; 24. Second connecting plate; 25. Third connecting plate; 26. Fourth connecting plate; 27. First groove; 28. Second groove; 29. ​​Shaft; 30. Nut; 31. Protrusion; 32. Second rotating shaft; 33. Second ear plate. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0029] Please see Figure 1-4 This utility model provides a technical solution: a soil dumping device for mining, including a belt conveyor 3, a screening section 1 and a frame 2. The screening section 1 has a plurality of screen holes 13 for screening soil and rocks. The frame 2 is used to support the screening section 1 directly above the feeding end of the conveyor belt 14 of the belt conveyor 3.

[0030] Before the belt conveyor 3 transports soil and rock, the soil and rock are first screened using the mining waste disposal device described in this utility model.

[0031] When using the mining waste disposal device described in this utility model to screen soil and rocks, the soil and rocks on the loader are dumped onto the screening section 1. Then, the soil and rocks are screened through multiple screen holes 13 on the screening section 1. During the screening process, stones larger than the screen holes 13 remain on the screening section 1, while soil and stones smaller than the screen holes 13 fall through the screen holes 13 onto the conveyor belt 14 of the belt conveyor 3. The size of the screen holes 13 can be reasonably set according to requirements. The soil and rocks falling onto the conveyor belt 14 of the belt conveyor 3 are then transported by the belt conveyor 3 and discharged to the waste disposal site.

[0032] The mining waste disposal device of this invention can screen out larger stones, which can reduce the impact of larger stones on the conveyor belt 14 and reduce the possibility of damage to the conveyor belt 14.

[0033] In this embodiment, the screening section 1 is slidably connected to the frame 2 along the length of the conveyor belt 14.

[0034] Since the screening section 1 can slide on the frame 2 along the length of the conveyor belt 14, the screening section 1 can be pushed and pulled back and forth on the frame 2 so that the screening section 1 swings back and forth on the frame 2 along the length of the conveyor belt 14. During the back and forth swinging of the screening section 1, soil and stones are less likely to accumulate on the screening section 1, and the soil and small stones on the screening section 1 can fall through the screen holes 13 more quickly.

[0035] In this embodiment, a reciprocating drive mechanism is also included. The reciprocating drive mechanism is disposed on the frame 2 and is used to drive the screening section 1 to slide back and forth in the length direction of the conveyor belt 14.

[0036] The screening section 1 can be pushed and pulled back and forth along the length of the conveyor belt 14 by a reciprocating drive mechanism, eliminating the need for manual pushing and pulling of the screening section 1, making it more convenient and labor-saving when pushing and pulling the screening section 1 along the length of the conveyor belt 14.

[0037] In this embodiment: the reciprocating drive mechanism includes a motor 4, an elliptical disk 5, and a helical spring 6. The motor 4 is fixed on the frame 2 and is located on the side of the screening section 1 facing away from the output end of the conveyor belt 14. The output shaft of the motor 4 is perpendicular to the length direction of the conveyor belt 14. The motor 4 is fixedly connected to the middle of the elliptical disk 5. The distance from the center of the elliptical disk 5 to the side of the screening section 1 facing away from the output end of the conveyor belt 14 is greater than the length of the semi-minor axis of the elliptical disk 5 and less than the length of the semi-major axis of the elliptical disk 5. One end of the helical spring 6 is fixedly connected to the frame 2, and the other end abuts against the side of the screening section 1 facing the output end of the conveyor belt 14.

[0038] The motor 4 can be a three-phase asynchronous AC motor of model YE2-250M-2. When the motor 4 is started, the motor 4 drives the elliptical disk 5 to rotate. As the major axis of the elliptical disk 5 rotates from a vertical state to a horizontal state, the elliptical disk 5 presses the screening section 1 towards the output end of the conveyor belt 14, causing the screening section 1 to move on the frame 2 towards the output end of the conveyor belt 14. At the same time, the screening section 1 presses and compresses the helical spring 6 towards the output end of the conveyor belt 14. As the major axis of the elliptical disk 5 rotates from a horizontal state to a vertical state, the helical spring 6 elastically resets and pushes the screening section 1 away from the output end of the conveyor belt 14, causing the screening section 1 to move away from the output end of the conveyor belt 14. As the motor 4 rotates continuously, the reciprocating drive mechanism can drive the screening section 1 to slide back and forth along the length of the conveyor belt 14.

[0039] In this embodiment: the frame 2 is provided with a slide rail 7, which is arranged along the length direction of the conveyor belt 14. The screening section 1 is provided with a slider 8 at a position corresponding to the slide rail 7. The lower side of the slider 8 is recessed upward to form a groove, which is slidably engaged with the slide rail 7. With this structure, the screening section 1 can be connected to the frame 2 in a way that allows it to slide along the length direction of the conveyor belt 14.

[0040] There are two slide rails 7, both of which are mounted on the frame 2. It is understood that the number of slide rails 7 is not limited to two; for example, in some embodiments, there may be one or more slide rails 7. Each slide rail 7 has two sliders 8, and the grooves on the two sliders 8 are slidably engaged with the slide rail 7. It is understood that the number of sliders 8 on each slide rail 7 is not limited to two; for example, in some embodiments, there may be one or more sliders 8 on each slide rail 7.

[0041] In this embodiment, the groove opening size 9 is smaller than the groove cavity size 10.

[0042] The groove opening size 9 is smaller than the groove cavity size 10. Specifically, the groove is a dovetail groove, which allows the groove opening size 9 to be smaller than the groove cavity size 10. Because the groove slides onto the slide rail 7, the slider 8 cannot detach upwards from the slide rail 7.

[0043] In this embodiment: the screening section 1 includes a box 11 and a sieve plate 12. The box 11 has openings at both the top and bottom. The sieve plate 12 is horizontally arranged on the box 11 and located directly above the opening at the top of the box 11. The projection of the opening at the bottom of the box 11 on a horizontal plane is located within the range of the projection of the upper side of the conveyor belt 14 on the horizontal plane. A plurality of sieve holes 13 are formed on the sieve plate 12.

[0044] When the soil and rocks on the loader are dumped onto the screening section 1, the soil and rocks are specifically dumped onto the screen plate 12. Stones larger than the screen holes 13 remain on the screen plate 12, while soil and stones smaller than the screen holes 13 pass through the screen holes 13, the opening at the upper end of the box 11, and the opening at the lower end of the box 11 in sequence and fall onto the conveyor belt 14 of the belt conveyor 3.

[0045] Since the projection of the lower opening of the box 11 onto a horizontal plane is within the range of the projection of the upper side of the conveyor belt 14 onto the horizontal plane, the soil and rocks falling from the lower opening of the box 11 can fall onto the conveyor belt 14 more accurately, thus reducing the amount of soil and rocks falling outside the conveyor belt 14.

[0046] In this embodiment: one end of the screen plate 12 is rotatably connected to the box body 11, the edge of the screen plate 12 is located outside the long edge of the conveyor belt 14, the rotation center line of the screen plate 12 is arranged parallel to the length direction of the conveyor belt 14, and the screening part 1 also includes a lifting part 17 for lifting the other end of the screen plate 12 opposite to the one end.

[0047] After a certain amount of large stones accumulate on the sieve plate 12, the lifting part 17 lifts the other end of the sieve plate 12 opposite to the first end, causing the other end of the sieve plate 12 to tilt upwards, while the first end of the sieve plate 12 tilts downwards, allowing the stones on the sieve plate 12 to roll off the edge of the first end of the sieve plate 12 and onto the ground. This structure makes it easier to remove large stones from the sieve plate 12.

[0048] The box body 11 has a fourth connecting block 15 and a fifth connecting block 16 at both ends. The fourth connecting block 15 and the fifth connecting block 16 are fixedly connected to the two ends of the box body 11. The fourth connecting block 15 has a third through hole, and the fifth connecting block 16 has a fourth through hole that is directly opposite to the third through hole. One end of the sieve plate 12 is located between the fourth connecting block 15 and the fifth connecting block 16. Shaft rods 29 are rotatably fitted in both the third through hole and the fourth through hole. Both shaft rods 29 are fixedly connected to the sieve plate 12. With this structure, one end of the sieve plate 12 can be rotatably connected to the box body 11.

[0049] The lifting unit 17 includes two electric push rods 18, which may be of model JS-TGZ-U1. The two electric push rods 18 are located on opposite sides of the housing 11. Specifically, one electric push rod 18 is located on the side of the housing 11 closer to the output end of the conveyor belt 14, and the other electric push rod 18 is located on the side of the housing 11 furthest from the output end of the conveyor belt 14. The lower end of each electric push rod 18 is rotatably connected to the housing 11, and the upper end of each electric push rod 18 is rotatably connected to the other end of the screen plate 12. By extending the electric push rod 18, the other end of the screen plate 12 can be lifted, and thus the lifting unit 17 can lift the other end of the screen plate 12. By shortening the electric push rod 18, the electric push rod 18 can drive the other end of the sieve plate 12 to descend and restore the sieve plate 12 to a horizontal state.

[0050] A first rotating shaft 19 is fixed on the housing 11 at the position corresponding to the lower end of the electric push rod 18. The first rotating shaft 19 is arranged parallel to the shaft 29. A first ear plate 20 is fixed at the lower end of the electric push rod 18. A first shaft hole is formed on the first ear plate 20. The first shaft hole is rotatably engaged with the first rotating shaft 19. With this structure, the lower end of the electric push rod 18 can be rotatably connected to the housing 11.

[0051] A second rotating shaft 32 is fixed at the other end of the sieve plate 12 at the position corresponding to the upper end of the electric push rod 18. The second rotating shaft 32 is arranged parallel to the shaft 29. A second ear plate 33 is fixed at the upper end of the electric push rod 18. A second shaft hole is formed on the second ear plate 33. The second shaft hole is rotatably engaged with the second rotating shaft 32. With this structure, the lower end of the electric push rod 18 can be rotatably connected to the other end of the sieve plate 12.

[0052] The side of the housing 11 facing away from the output end of the conveyor belt 14 is also provided with a protrusion 31. One end of the protrusion 31 is fixedly connected to the housing 11, and the end face of the other end of the protrusion 31 opposite to the first end is the side of the screening section 1 facing away from the output end of the conveyor belt 14. During the rotation of the elliptical disc 5, the end face of the other end of the protrusion 31 is also a surface for being squeezed by the elliptical disc 5.

[0053] In this embodiment: the sieve plate 12 includes a square frame 21 and multiple connecting rods 22. The multiple connecting rods 22 are detachably fixedly connected to the square frame 21. The multiple connecting rods 22 are arranged at intervals along the length of the conveyor belt 14. The interval between each pair of adjacent connecting rods 22 is the sieve hole 13.

[0054] Since the connecting rod 22 is detachably fixed inside the square frame 21, it can be removed from the square frame 21 and replaced after the connecting rod 22 bends due to long-term use.

[0055] In this embodiment: the square frame 21 includes a first connecting plate 23, a second connecting plate 24, a third connecting plate 25, and a fourth connecting plate 26. The first connecting plate 23 and the second connecting plate 24 are arranged along the length direction of the conveyor belt 14, and the third connecting plate 25 and the fourth connecting plate 26 are arranged along the width direction of the conveyor belt 14. Both ends of the first connecting plate 23 are fixedly connected to one end of the third connecting plate 25 and one end of the fourth connecting plate 26, respectively. The other ends of the third connecting plate 25 and the fourth connecting plate 26 are fixedly connected to both ends of the second connecting plate 24, respectively. The upper side of the first connecting plate 23 is recessed downwards at the position corresponding to each connecting rod 22. A first groove 27 is formed. The upper side of the second connecting plate 24 is recessed downward to form a second groove 28 corresponding to the position of each connecting rod 22. The two ends of the connecting rod 22 are respectively located in the corresponding first groove 27 and the corresponding second groove 28. Both ends of the connecting rod 22 are provided with external threads. Both ends of the connecting rod 22 are screwed with nuts 30. The two nuts 30 respectively abut against the outer side of the first connecting plate 23 and the second connecting plate 24. Specifically, the outer side of the first connecting plate 23 is the side of the first connecting plate 23 facing away from the second connecting plate 24, and the outer side of the second connecting plate 24 is the side of the second connecting plate 24 facing away from the first connecting plate 23.

[0056] The two ends of the connecting rod 22 are respectively located in the corresponding first groove 27 and the corresponding second groove 28. Nuts 30 are then screwed onto both ends of the connecting rod 22, with the two nuts 30 abutting against the outer surfaces of the first connecting plate 23 and the second connecting plate 24, respectively. The connecting rod 22 is then fixedly connected to the square frame 21. The two nuts 30 are rotated on the connecting rod 22, causing them to move away from the square frame 21, thus detaching them from the first connecting plate 23 and the second connecting plate 24. The connecting rod 22 is then moved upwards, causing its two ends to move out of the corresponding first groove 27 and the corresponding second groove 28, respectively, allowing the connecting rod 22 to be detached from the square frame 21. With this structure, the connecting rod 22 is detachably and fixedly connected to the square frame 21.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A spoil disposal device for mining, characterized in that: It includes a belt conveyor (3), a screening section (1) and a frame (2). The screening section (1) has multiple sieve holes (13) for screening soil and rocks. The frame (2) is used to support the screening section (1) directly above the feeding end of the conveyor belt (14) of the belt conveyor (3). The screening section (1) is slidably connected to the frame (2) along the length of the conveyor belt (14); The screening section (1) includes a box (11) and a sieve plate (12). The box (11) has openings at both the top and bottom. The sieve plate (12) is horizontally arranged on the box (11) and located directly above the opening at the top of the box (11). The projection of the opening at the bottom of the box (11) on a horizontal plane is located within the range of the projection of the upper side of the conveyor belt (14) on the horizontal plane. A plurality of sieve holes (13) are formed on the sieve plate (12). One end of the screen plate (12) is rotatably connected to the box body (11). One edge of the screen plate (12) is located outside the long edge of the conveyor belt (14). The rotation center line of the screen plate (12) is parallel to the length direction of the conveyor belt (14). The screening part (1) also includes a lifting part (17) for lifting the other end of the screen plate (12) opposite to the one end.

2. The mining waste dumping device according to claim 1, characterized in that: It also includes a reciprocating drive mechanism, which is mounted on the frame (2) and is used to drive the screening section (1) to slide back and forth along the length of the conveyor belt (14).

3. A spoil disposal device for mining according to claim 2, characterized in that: The reciprocating drive mechanism includes a motor (4), an elliptical disk (5), and a helical spring (6). The motor (4) is fixed on the frame (2). The motor (4) is located on the side of the screening section (1) facing away from the output end of the conveyor belt (14). The output shaft of the motor (4) is set perpendicular to the length direction of the conveyor belt (14). The motor (4) is fixedly connected to the middle of the elliptical disk (5). The distance from the center of the elliptical disk (5) to the side of the screening section (1) facing away from the output end of the conveyor belt (14) is greater than the length of the semi-minor axis of the elliptical disk (5) and less than the length of the semi-major axis of the elliptical disk (5). One end of the helical spring (6) is fixedly connected to the frame (2), and the other end abuts against the side of the screening section (1) facing the output end of the conveyor belt (14).

4. A spoil disposal device for mining according to claim 2, characterized in that: The frame (2) is provided with a slide rail (7), which is arranged along the length of the conveyor belt (14). The screening part (1) is provided with a slider (8) at the position corresponding to the slide rail (7). The lower side of the slider (8) is recessed upward to form a groove, which slides and engages with the slide rail (7).

5. A spoil disposal device for mining according to claim 4, characterized in that: The groove opening size (9) is smaller than the groove cavity size (10).

6. A spoil disposal device for mining according to claim 1, characterized in that: The sieve plate (12) includes a square frame (21) and multiple connecting rods (22). The multiple connecting rods (22) are detachably fixed inside the square frame (21). The multiple connecting rods (22) are arranged sequentially at intervals along the length of the conveyor belt (14). The interval between each pair of adjacent connecting rods (22) is the sieve hole (13).

7. A spoil disposal device for mining according to claim 6, characterized in that: The square frame (21) includes a first connecting plate (23), a second connecting plate (24), a third connecting plate (25), and a fourth connecting plate (26). The first connecting plate (23) and the second connecting plate (24) are arranged along the length direction of the conveyor belt (14), and the third connecting plate (25) and the fourth connecting plate (26) are arranged along the width direction of the conveyor belt (14). The two ends of the first connecting plate (23) are fixedly connected to one end of the third connecting plate (25) and one end of the fourth connecting plate (26), respectively. The other ends of the third connecting plate (25) and the other ends of the fourth connecting plate (26) are fixedly connected to the second connecting plate (24). At both ends of 4), the upper side of the first connecting plate (23) is recessed downward to form a first groove (27) corresponding to the position of each connecting rod (22), and the upper side of the second connecting plate (24) is recessed downward to form a second groove (28) corresponding to the position of each connecting rod (22). The two ends of the connecting rod (22) are respectively located in the corresponding first groove (27) and the corresponding second groove (28). Both ends of the connecting rod (22) are provided with external threads, and both ends of the connecting rod (22) are screwed with nuts (30). The two nuts (30) respectively abut against the outer side of the first connecting plate (23) and the second connecting plate (24).

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