Coal mine crushing equipment with multi-stage circulating crushing structure

Abstract

The invention relates to the technical field of coal mines, and discloses coal mine crushing equipment with a multi-stage circulating crushing structure, which comprises a box body, supporting columns are arranged at four corners of the bottom surface of the box body, a feeding hole is fixedly formed in the top of the box body in a penetrating manner, and a discharging pipe is fixedly arranged at the bottom of the box body in a penetrating manner; a crushing shaft penetrates through a transverse bearing on the right side wall of the box body, the left end of the crushing shaft is connected with a bearing on the inner wall surface of the left side of the box body, first crushing cutters are uniformly arranged on the surface of the crushing shaft, and a power mechanism is connected to the right end of the crushing shaft; and a rotating shaft penetrates through a transverse bearing on the right side wall of the box body. The coal mine crushing equipment with the multi-stage circulating crushing structure can perform multi-stage crushing on a coal mine, ensures that the coal mine is fully and effectively crushed, improves the coal mine crushing effect, can screen crushed coal mine powder, and can perform circulating crushing on large-particle coal mine powder, so that the crushing quality of the coal mine powder is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mines, and specifically to a coal mine crushing device with a multi-stage circulating crushing structure. Background Technique

[0002] Coal mines are important energy sources in human production and life in today's society. Coal mines are buried deep in the strata far from the surface. After coal mines are mined, they need to be crushed and then reprocessed. However, existing coal mine crushing devices still have certain defects. For example: For the "raw coal crushing device for coal mine mining" with the application number CN202020888179.X, during use, it is impossible to screen and circularly crush the crushed coal powder. The lack of screening of coal powder makes it difficult to ensure the uniformity of the particle size of coal powder, and it is inconvenient to screen out large-particle coal powder for re-crushing, which affects the crushing effect of coal powder and is not conducive to ensuring the crushing quality of coal powder, and there are limitations in use; In view of this, in-depth research on the above problems has led to the proposal of a coal mine crushing device with a multi-stage circulating crushing structure. Summary of the Invention

[0003] The purpose of the present invention is to provide a coal mine crushing device with a multi-stage circulating crushing structure to solve the problems presented in the above background technique.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A coal mine crushing device with a multi-stage circulating crushing structure includes a box body. Support columns are provided at the four corners of the bottom surface of the box body. A feed port is fixedly penetrated and provided at the top of the box body. A discharge pipe is fixedly penetrated and provided at the bottom of the box body. A crushing shaft is horizontally and bearing-penetrated through the right side wall of the box body, and the left end of the crushing shaft is bearing-connected to the left inner wall surface of the box body. First crushing knives are evenly arranged on the surface of the crushing shaft, and a power mechanism is connected to the right end of the crushing shaft; A rotating shaft is horizontally and bearing-penetrated through the right side wall of the box body, and two rotating shafts are arranged symmetrically in the front and back. Crushing rollers are fixedly sleeved on the surfaces of the two rotating shafts, and the crushing rollers are located below the first crushing knives. Connecting gears are fixedly sleeved on the surfaces of the two rotating shafts, and the two connecting gears are meshed with each other, and the connecting gears are located on the right side of the box body; On the left side of the box body, two fixing plates are fixedly installed, and a feeding cylinder is fixedly arranged through the fixing plates. The lower end of the right side wall of the feeding cylinder is fixedly connected and communicated with the left end of the discharging channel, and the discharging channel is fixedly arranged through the left side wall of the box body. A rotating rod is installed at the center of the inner top surface of the feeding cylinder through a bearing, and the rotating rod passes through the center of the bottom of the feeding cylinder through a bearing. A spiral feeding plate is installed on the surface of the rotating rod, and the spiral feeding plate is located inside the feeding cylinder. The upper end of the right side wall of the feeding cylinder is fixedly provided with a return pipe in a penetrating manner, and the right side of the return pipe is fixedly arranged through the left side wall of the feeding port; A screen is movably arranged inside the box body, and the screen is located below the crushing roller, and the left end of the screen is located above the feeding end of the discharging channel; A shell is fixedly installed on the right side of the box body, a sliding plate is horizontally slidably connected to the inner top surface of the shell, and the crushing shaft passes through the sliding plate movably; A rotating mechanism that abuts against the sliding plate is arranged on the crushing shaft, a crushing mechanism is arranged on the left side surface of the sliding plate, the crushing shaft is connected to the rotating shaft through a first transmission mechanism, the bottom surface of the sliding plate is connected to the screen through a connecting mechanism, and the bottom end of the rotating mechanism is connected to the bottom end of the rotating rod through a second transmission mechanism.

[0005] Adopting the above technical solution is convenient for circular crushing after screening of coal powder, and improves the crushing effect of coal powder.

[0006] As a preferred technical solution of the present invention, a guiding hopper and a guiding plate are sequentially arranged on the inner wall surface of the box body from top to bottom. The guiding hopper is located between the first crushing knife and the crushing roller, and the guiding plate is located between the crushing roller and the screen.

[0007] Adopting the above technical solution is convenient for guiding and dropping the crushed coal powder.

[0008] As a preferred technical solution of the present invention, the power mechanism includes a motor. The motor is fixedly installed on the right inner wall surface of the shell, and the shaft end of the motor is key-connected to the right end of the crushing shaft.

[0009] Adopting the above technical solution is convenient for rotating the crushing shaft by the motor.

[0010] As a preferred technical solution of the present invention, the rotating mechanism includes a strip-shaped plate. The strip-shaped plate is fixedly installed on the right inner wall surface of the shell, and a round rod is longitudinally arranged through the strip-shaped plate through a bearing, and the round rod passes through the bottom of the shell through a bearing. A conical gear set is fixedly installed at the top end of the round rod, and the conical gear set is installed on the surface of the crushing shaft. A cam is fixedly sleeved on the surface of the round rod, and the cam abuts against the right side surface of the sliding plate.

[0011] With the above technical solution, when the crushing shaft rotates, it is convenient to drive the round rod and the cam to rotate through the bevel gear set.

[0012] As a preferred technical solution of the present invention, the crushing mechanism includes a sliding rod, the sliding rod is fixedly installed on the left side surface of the sliding plate, and there are two sliding rods arranged symmetrically front and back. The sliding rod slidably penetrates the right side wall of the box body, and the inner side surface of the sliding rod is equidistantly and uniformly installed with second crushing knives.

[0013] With the above technical solution, when the cam rotates, it is convenient to push the sliding plate, the sliding rod and the second crushing knife to move.

[0014] As a preferred technical solution of the present invention, the second crushing knife and the first crushing knife are arranged in a staggered manner.

[0015] With the above technical solution, it is convenient for the movement of the first crushing knife and the second crushing knife not to interfere with each other.

[0016] As a preferred technical solution of the present invention, the crushing mechanism further includes a straight rod, the straight rod is fixedly installed on the right side surface of the box body, and there are two straight rods arranged symmetrically front and back. The straight rod slidably penetrates the sliding plate, and a spring is sleeved on the outer side of the straight rod. The left and right ends of the spring are respectively fixedly connected to the right side surface of the box body and the left side surface of the sliding plate.

[0017] With the above technical solution, it is convenient to push the sliding plate to move back to its original position through the setting of the spring, and ensure that the sliding plate drives the sliding rod and the second crushing knife to reciprocate during the rotation of the cam through the spring.

[0018] As a preferred technical solution of the present invention, the first transmission mechanism includes a first driving pulley, the first driving pulley is fixedly installed on the surface of the crushing shaft, and the first driving pulley is connected to a first driven pulley through a first belt. The first driven pulley is fixedly sleeved on the surface of the rear shaft.

[0019] With the above technical solution, when the crushing shaft rotates, it is convenient to drive the shaft to rotate through the first driving pulley, the first belt and the first driven pulley.

[0020] As a preferred technical solution of the present invention, the connecting mechanism includes a connecting plate, the connecting plate is fixedly installed on the bottom surface of the sliding plate, and the bottom surface of the connecting plate is horizontally slidably connected to the inner bottom surface of the housing. A connecting rod is fixedly installed on the left side surface of the connecting plate, and the connecting rod slidably penetrates the right side wall of the box body. The left end of the connecting rod is fixedly connected to the right side surface of the screen, and the screen is inclined with the left end lower and the right end higher.

[0021] Adopting the above technical solution, it is convenient for the connecting plate to drive the connecting rod and the screen to reciprocate when the skateboard reciprocates, improving the screening effect of coal mine powder.

[0022] As a preferred technical solution of the present invention, the second transmission mechanism includes a second driving pulley, the second driving pulley is coaxially and fixedly installed at the bottom end of the round rod, and the second driving pulley is connected to a second driven pulley through a second belt, and the second driven pulley is coaxially and fixedly installed at the bottom end of the rotating rod.

[0023] Adopting the above technical solution, it is convenient for the round rod to drive the rotating rod and the screw feeding plate to rotate through the second driving pulley and the second driven pulley of the second belt when the round rod rotates, realizing the upward conveying of coal mine powder.

[0024] Compared with the prior art, the beneficial effects of the present invention are: the coal mine crushing equipment with a multi-stage cyclic crushing structure can perform multi-stage crushing on coal mines, ensuring full and effective crushing of coal mines, improving the coal mine crushing effect, and being able to screen the crushed coal mine powder. The large-particle coal mine powder can be cyclically crushed, thus ensuring the crushing quality of coal mine powder; 1. The motor drives the crushing shaft to rotate, so that the first crushing knife rotates to crush the coal mine powder. When the crushing shaft rotates, it drives the round rod to rotate through the bevel gear set, so that the round rod drives the cam to rotate and push the skateboard, the sliding rod and the second crushing knife to move leftward and compress the spring. During the rotation of the cam, the skateboard drives the sliding rod and the second crushing knife to reciprocate through the release action of the spring, improving the crushing efficiency of the coal mine powder; 2. When the crushing shaft rotates, it drives the first driving pulley to rotate. Through the first belt, the first driven pulley drives the rear rotating shaft to rotate. Under the action of the connecting gear, the rotating shafts on both sides drive the crushing rollers to rotate, realizing multi-stage crushing of the coal mine powder; 3. While the skateboard reciprocates, it drives the screen to reciprocate through the connecting plate and the connecting rod, realizing the screening of the coal mine powder, ensuring that the large-particle coal mine powder is screened out and enters the feeding cylinder through the discharge through pipe; 4. When the round rod rotates, it drives the second driving pulley to rotate. Through the action of the second belt, the second driven pulley drives the rotating rod and the spiral feeding plate to rotate, so that the screened large-particle coal mine powder is conveyed upward and re-enters the box through the return pipe, realizing the cyclic crushing of the coal mine powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the main sectional structure of the present invention; Figure 3 is a schematic diagram of the sectional connection structure of the box body, the crushing shaft and the sliding rod of the present invention; Figure 4Schematic diagram of the connection structure of the skateboard, crushing shaft and sliding rod of the present invention; Figure 5 Schematic diagram of the connection structure of the rotating shaft and the crushing roller of the present invention; Figure 6 Schematic diagram of the sectional connection structure of the housing, strip plate and rotating shaft of the present invention; Figure 7 Schematic diagram of the connection structure of the connecting rod, connecting plate and screen of the present invention; Figure 8 Schematic diagram of the sectional connection structure of the screen and the box body of the present invention; Figure 9 Schematic diagram of the connection structure of the box body, material guiding hopper and material guiding plate of the present invention; Figure 10 Schematic diagram of the connection structure of the second belt, second driving pulley and second driven pulley of the present invention.

[0026] In the figure: 1. Box body; 2. Support column; 3. Feed inlet; 4. Discharge pipe; 5. Crushing shaft; 6. First crushing knife; 7. Rotating shaft; 8. Crushing roller; 9. Connecting gear; 10. Fixed plate; 11. Feeding cylinder; 12. Discharge channel; 13. Rotating rod; 14. Spiral feeding plate; 15. Return pipe; 16. Screen; 17. Material guiding hopper; 18. Material guiding plate; 19. Motor; 20. Housing; 21. Strip plate; 22. Round rod; 23. Bevel gear set; 24. Cam; 25. Skateboard; 26. Sliding rod; 27. Second crushing knife; 28. Straight rod; 29. First driving pulley; 30. First belt; 31. First driven pulley; 32. Connecting plate; 33. Connecting rod; 34. Second driving pulley; 35. Second belt; 36. Second driven pulley; 37. Spring. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figure 1 - Figure 10 For the technical solution of the present invention: a coal mine crushing device with a multi-stage circulating crushing structure, including a box body 1, support columns 2 are arranged at the four corners of the bottom surface of the box body 1, a feed inlet 3 is fixedly and penetratingly arranged at the top of the box body 1, and a discharge pipe 4 is fixedly and penetratingly arranged at the bottom of the box body 1. A crushing shaft 5 is horizontally arranged through the right side wall of the box body 1, and the left end of the crushing shaft 5 is connected to the left inner wall surface of the box body 1 by a bearing. The surface of the crushing shaft 5 is evenly provided with first crushing knives 6, and the right end of the crushing shaft 5 is connected to a power mechanism; Two rotating shafts 7 are horizontally arranged through the right side wall of the box body 1 by bearings, and the two rotating shafts 7 are symmetrically arranged front and back. The surfaces of the two rotating shafts 7 are fixedly sleeved with crushing rollers 8, and the crushing rollers 8 are located below the first crushing knives 6. The surfaces of the two rotating shafts 7 are fixedly sleeved with connecting gears 9, and the two connecting gears 9 are meshed with each other, and the connecting gears 9 are located on the right side of the box body 1; Two fixing plates 10 are fixedly installed on the left side surface of the box body 1, and a feeding cylinder 11 is fixedly arranged through the fixing plates 10. The lower end of the right side wall of the feeding cylinder 11 is fixedly connected to the left end of a discharge channel 12, and the discharge channel 12 is fixedly arranged through the left side wall of the box body 1. The center of the inner top surface of the feeding cylinder 11 is installed with a rotating rod 13 by a bearing, and the rotating rod 13 is arranged through the center of the bottom of the feeding cylinder 11 by a bearing. A spiral feeding plate 14 is installed on the surface of the rotating rod 13, and the spiral feeding plate 14 is located inside the feeding cylinder 11. The upper end of the right side wall of the feeding cylinder 11 is fixedly provided with a return pipe 15, and the right side of the return pipe 15 is fixedly communicated with the left side wall of the feeding port 3; A sieve mesh 16 is movably arranged inside the box body 1, and the sieve mesh 16 is located below the crushing rollers 8, and the left end of the sieve mesh 16 is located above the feeding end of the discharge channel 12; A housing 20 is fixedly installed on the right side surface of the box body 1, and a sliding plate 25 is horizontally slidably connected to the inner top surface of the housing 20, and the crushing shaft 5 movably penetrates through the sliding plate 25; A rotating mechanism in contact with the sliding plate 25 is arranged on the crushing shaft 5, and a crushing mechanism is arranged on the left side surface of the sliding plate 25. The crushing shaft 5 is connected to the rotating shaft 7 through a first transmission mechanism, the bottom surface of the sliding plate 25 is connected to the sieve mesh 16 through a connecting mechanism, and the bottom end of the rotating mechanism is connected to the bottom end of the rotating rod 13 through a second transmission mechanism; A material guiding hopper 17 and a material guiding plate 18 are sequentially arranged on the inner wall surface of the box body 1 from top to bottom. The material guiding hopper 17 is located between the first crushing knives 6 and the crushing rollers 8, and the material guiding plate 18 is located between the crushing rollers 8 and the sieve mesh 16; The power mechanism includes a motor 19. The motor 19 is fixedly installed on the right inner wall surface of the housing 20, and the shaft end of the motor 19 is key-connected to the right end of the crushing shaft 5; The rotating mechanism includes a strip-shaped plate 21. The strip-shaped plate 21 is fixedly installed on the right inner wall surface of the housing 20, and a round rod 22 is longitudinally arranged through the strip-shaped plate 21 by a bearing, and the round rod 22 is arranged through the bottom of the housing 20 by a bearing. A conical gear set 23 is fixedly installed at the top end of the round rod 22, and the conical gear set 23 is installed on the surface of the crushing shaft 5. A cam 24 is fixedly sleeved on the surface of the round rod 22, and the cam 24 abuts against the right side surface of the sliding plate 25; The crushing mechanism includes a slide bar 26, which is fixedly installed on the left side of the slide plate 25. There are two slide bars 26 arranged symmetrically in the front and back. The slide bar 26 slidably penetrates through the right side wall of the box body 1, and the inner side of the slide bar 26 is evenly installed with second crushing knives 27 at equal intervals. The second crushing knives 27 are arranged in a staggered manner with the first crushing knives 6; The crushing mechanism further includes straight bars 28, which are fixedly installed on the right side of the box body 1. There are two straight bars 28 arranged symmetrically in the front and back. The straight bars 28 slidably penetrate through the slide plate 25, and a spring 37 is sleeved on the outer side of the straight bars 28. The left and right ends of the spring 37 are respectively fixedly connected to the right side of the box body 1 and the left side of the slide plate 25; The first transmission mechanism includes a first driving pulley 29, which is fixedly installed on the surface of the crushing shaft 5. The first driving pulley 29 is connected to a first driven pulley 31 through a first belt 30, and the first driven pulley 31 is fixedly sleeved on the surface of the rear shaft 7; The connecting mechanism includes a connecting plate 32, which is fixedly installed on the bottom surface of the slide plate 25. The bottom surface of the connecting plate 32 is horizontally slidably connected to the inner bottom surface of the housing 20. A connecting rod 33 is fixedly installed on the left side surface of the connecting plate 32. The connecting rod 33 slidably penetrates through the right side wall of the box body 1, and the left end of the connecting rod 33 is fixedly connected to the right side surface of the screen 16. The screen 16 is inclined with the left end lower and the right end higher; The second transmission mechanism includes a second driving pulley 34, which is coaxially and fixedly installed at the bottom end of the round rod 22. The second driving pulley 34 is connected to a second driven pulley 36 through a second belt 35, and the second driven pulley 36 is coaxially and fixedly installed at the bottom end of the rotating rod 13.

[0029] Working principle: When in use, the coal powder is put into the box body 1 through the feed inlet 3. At the same time, the motor 19 is started to make the crushing shaft 5 rotate. When the crushing shaft 5 rotates, it drives the first crushing knives 6 to rotate, so as to crush the coal powder; When the crushing shaft 5 rotates, it drives the round rod 22 to rotate through the bevel gear set 23, so that the round rod 22 drives the cam 24 to rotate synchronously. The rotation of the cam 24 will push the slide plate 25, the slide bar 26 and the second crushing knives 27 to move and compress the spring 37, so that during the rotation of the cam 24, the slide plate 25 drives the slide bar 26 and the second crushing knives 27 to move back and forth through the release action of the spring 37, thereby improving the crushing effect on the coal powder. The crushed coal powder will fall through the guide hopper 17; When the crushing shaft 5 rotates, it drives the first driving pulley 29 to rotate. Through the action of the first belt 30, the first driven pulley 31 drives the rear shaft 7 to rotate. Under the action of the connecting gear 9, the shafts 7 on both sides drive the crushing rollers 8 to rotate synchronously, so as to crush the coal powder again, realizing the multi-stage crushing of the coal powder. The crushed coal powder will fall onto the screen 16 through the guide plate 18; While the sliding plate 25 reciprocates, it will drive the connecting plate 32 to reciprocate, so that the connecting plate 32 drives the connecting rod 33 and the screen 16 to reciprocate, thereby filtering and screening the coal powder, and enabling the large-particle coal powder to fall into the discharge channel 12 and then enter the conveying cylinder 11; When the round rod 22 rotates, it drives the second driving pulley 34 to rotate. Through the action of the second belt 35, the second driven pulley 36 drives the rotating rod 13 to rotate synchronously, so that the rotating rod 13 drives the spiral conveying plate 14 to rotate synchronously, thereby conveying the large-particle coal powder upward and re-entering the box body 1 through the return pipe 15 and the feed inlet 3 again, so as to realize the cyclic crushing of the coal powder. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0030] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal mine crushing device with a multi-stage cyclic crushing structure, including a box body (1). Support columns (2) are arranged at the four corners of the bottom surface of the box body (1). A feed inlet (3) is fixedly and penetratingly arranged at the top of the box body (1). A discharge pipe (4) is fixedly and penetratingly arranged at the bottom of the box body (1). It is characterized in that: A crushing shaft (5) is horizontally and bearingly penetrated through the right side wall of the box body (1), and the left end of the crushing shaft (5) is bearingly connected to the left inner wall surface of the box body (1). First crushing knives (6) are evenly arranged on the surface of the crushing shaft (5), and a power mechanism is connected to the right end of the crushing shaft (5); A rotating shaft (7) is horizontally and bearingly penetrated through the right side wall of the box body (1), and two rotating shafts (7) are arranged symmetrically in the front and back. Crushing rollers (8) are fixedly sleeved on the surfaces of the two rotating shafts (7), and the crushing rollers (8) are located below the first crushing knives (6). Connecting gears (9) are fixedly sleeved on the surfaces of the two rotating shafts (7), and the two connecting gears (9) are meshed with each other, and the connecting gears (9) are located on the right side of the box body (1); Two fixing plates (10) are fixedly installed on the left side surface of the box body (1), and a feeding cylinder (11) is fixedly and penetratingly arranged on the fixing plates (10). The lower end of the right side wall of the feeding cylinder (11) is fixedly connected and communicated with the left end of a discharge channel (12), and the discharge channel (12) fixedly penetrates through the left side wall of the box body (1). A rotating rod (13) is installed at the center of the inner top surface of the feeding cylinder (11) by a bearing, and the rotating rod (13) is bearingly penetrated through the center of the bottom of the feeding cylinder (11). A spiral feeding plate (14) is installed on the surface of the rotating rod (13), and the spiral feeding plate (14) is located inside the feeding cylinder (11). A return pipe (15) is fixedly and penetratingly arranged at the upper end of the right side wall of the feeding cylinder (11), and the right side of the return pipe (15) is fixedly and penetratingly connected to the left side wall of the feed inlet (3); A screen (16) is movably arranged inside the box body (1), and the screen (16) is located below the crushing rollers (8), and the left end of the screen (16) is located above the feeding end of the discharge channel (12); A shell (20) is fixedly installed on the right side surface of the box body (1), and a sliding plate (25) is horizontally slidably connected to the inner top surface of the shell (20), and the crushing shaft (5) movably penetrates through the sliding plate (25); A rotating mechanism in contact with the sliding plate (25) is arranged on the crushing shaft (5), and a crushing mechanism is arranged on the left side surface of the sliding plate (25). The crushing shaft (5) is connected to the rotating shaft (7) through a first transmission mechanism. The bottom surface of the sliding plate (25) is connected to the screen (16) through a connecting mechanism. The bottom end of the rotating mechanism is connected to the bottom end of the rotating rod (13) through a second transmission mechanism.

2. The coal crushing equipment with a multi-stage cyclic crushing structure according to claim 1, characterized in that, A material guide hopper (17) and a material guide plate (18) are arranged on the inner wall surface of the box body (1) in order from top to bottom; the material guide hopper (17) is located between the first crushing knife (6) and the crushing roller (8); and the material guide plate (18) is located between the crushing roller (8) and the screen (16).

3. The coal crushing equipment with a multi-stage cyclic crushing structure according to claim 1, characterized in that, The power mechanism comprises a motor (19), the motor (19) being fixedly mounted on the right inner wall surface of the housing (20), and the shaft end of the motor (19) being key-connected to the right end of the pulverizing shaft (5).

4. A coal crushing device with a multi-stage cyclic crushing structure according to claim 1, characterized in that, The rotating mechanism comprises a strip plate (21), the strip plate (21) being fixedly mounted on the right inner wall surface of the housing (20), a round rod (22) being provided on the strip plate (21) through a longitudinal bearing, and the round rod (22) bearing being passed through the bottom of the housing (20), a bevel gear set (23) being fixedly mounted on the top end of the round rod (22), and the bevel gear set (23) being mounted on the surface of the pulverizing shaft (5), a cam (24) being fixedly sleeved on the surface of the round rod (22), and the cam (24) being in contact with the right side surface of the slide plate (25).

5. A coal mine crushing device with a multi-stage cyclic crushing structure according to claim 1, characterized in that, The crushing mechanism comprises a slide bar (26), the slide bar (26) being fixedly mounted on the left side of the slide plate (25), and two slide bars (26) being symmetrically arranged front and back, the slide bar (26) slidingly passing through the right side wall of the box body (1), and second crushing knives (27) being evenly and equidistantly mounted on the inner side surface of the slide bar (26).

6. The coal crushing equipment with a multi-stage cyclic crushing structure according to claim 5, characterized in that, The second crushing knife (27) and the first crushing knife (6) are arranged in a staggered manner.

7. A coal mine crushing device with a multi-stage cyclic crushing structure according to claim 5, characterized in that, The pulverizing mechanism further comprises a straight rod (28), the straight rod (28) being fixedly mounted on the right side of the box body (1), and two straight rods (28) being symmetrically arranged front and back, the straight rod (28) being slidably arranged to penetrate the slide plate (25), and a spring (37) being sleeved on the outer side of the straight rod (28), and the left and right ends of the spring (37) being respectively fixedly connected to the right side of the box body (1) and the left side of the slide plate (25).

8. A coal mine crushing device with a multi-stage cyclic crushing structure according to claim 1, characterized in that, The first transmission mechanism comprises a first driving pulley (29), the first driving pulley (29) being fixedly mounted on the surface of the pulverizing shaft (5), the first driving pulley (29) being connected to a first driven pulley (31) via a first belt (30), and the first driven pulley (31) being fixedly sleeved on the surface of the rotating shaft (7) at the rear side.

9. A coal crushing device with a multi-stage cyclic crushing structure according to claim 1, characterized in that, The connecting mechanism comprises a connecting plate (32), the connecting plate (32) being fixedly mounted on the bottom surface of the slide plate (25), and the bottom surface of the connecting plate (32) being laterally slidably connected to the inner bottom surface of the shell (20), a connecting rod (33) being fixedly mounted on the left side surface of the connecting plate (32), and the connecting rod (33) slidingly passes through the right side wall of the box body (1), and the left end of the connecting rod (33) being fixedly connected to the right side surface of the screen (16), and the screen (16) being inclined with the left side lower and the right side higher.

10. A coal mine crushing device with a multi-stage cyclic crushing structure according to claim 4, characterized in that, The second transmission mechanism includes a second driving pulley (34), the second driving pulley (34) is coaxially and fixedly installed at the bottom end of the round rod (22), and the second driving pulley (34) is drivingly connected to a second driven pulley (36) through a second belt (35), and the second driven pulley (36) is coaxially and fixedly installed at the bottom end of the rotating rod (13).

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