Crusher for coal mining

Abstract

The invention discloses a crusher for coal mining, which organically combines a conduction mechanism, a crushing mechanism, a discharging mechanism and a spreading mechanism to form a set of complete crushing and transporting system. The transmission mechanism can smoothly guide the tunneled coal mine to the crushing mechanism to ensure that the coal mine can accurately enter a crushing link; the crushing mechanism crushes the coal mine to meet the requirements of subsequent transportation and use on the granularity of the coal mine; the discharging mechanism is used for conveying the crushed coal mine to the conveying mechanism, so that seamless connection of crushing and conveying is realized; and the spreading mechanism can level the coal mine on the conveying mechanism, so that the situation that the conveying efficiency is affected or potential safety hazards are caused due to too high accumulation of the coal mine is prevented, and the crushing and conveying efficiency and reliability after coal mine excavation are integrally improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of coal mining, and particularly relates to a coal mining crusher. BACKGROUND

[0002] In coal mining operations, crushing and transportation are two key links. After mining, the coal usually needs to be crushed to meet the requirements of particle size for transportation and subsequent use. However, the existing crushing and transportation system has some problems, such as low crushing efficiency, inconvenient equipment maintenance, and coal accumulation during transportation, which seriously affect the overall efficiency and safety of coal mining. Therefore, it is of great practical significance to develop a high-efficiency, reliable and easy-to-maintain crushing and transportation system.

[0003] In traditional crushing and transportation systems, crushing equipment and transportation equipment are often separate, and the crushed coal needs to pass through additional intermediate links to enter the transportation equipment, which not only increases the complexity of the equipment, but also easily leads to coal accumulation or spilling during transfer, affecting transportation efficiency and the environment.

[0004] The existing crushing equipment has a complex structure, and during maintenance, the entire equipment needs to be disassembled on a large scale, especially the maintenance and replacement of key components such as the crushing roller, which is time-consuming and labor-intensive, increasing maintenance costs and equipment downtime.

[0005] During coal transportation, especially on the conveyor belt, coal is prone to accumulate too high, leading to a decrease in transportation efficiency, and even may cause equipment failure or safety hazards. In addition, the accumulated coal has uneven particle size, affecting the quality of subsequent use.

[0006] Therefore, the present application is proposed. SUMMARY

[0007] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a coal mining crusher that solves the problems raised in the background.

[0008] To solve the above technical problems, the basic idea of the technical solution of the present application is:

[0009] A coal mining crusher, comprising a conduction mechanism and a transportation mechanism, a crushing mechanism is arranged below the conduction mechanism, the conduction mechanism can guide the mined coal to the crushing mechanism, and the crushing mechanism crushes the coal inside, in addition, the crushing mechanism and the conduction mechanism are connected in a splicing combination manner.

[0010] A discharge mechanism is fixedly connected below the crushing mechanism, and the discharge opening of the discharge mechanism faces the upper side of the transportation mechanism, so as to convey the crushed coal to the upper side of the transportation mechanism.

[0011] The paving mechanism is arranged on the two sides of the discharging mechanism, is located above the conveying mechanism and has a space with the conveying mechanism, so as to push the coal mine on the surface to be flat, and in addition, the paving mechanism and the discharging mechanism are in sliding fit, so as to realize the adjustment of the distance from the conveying mechanism.

[0012] The pulverizing mechanism comprises a pulverizing cylinder, two arc-shaped grooves are formed in the upper portion of the pulverizing cylinder, a pulverizing roller is rotatably connected in the arc-shaped grooves, a connecting seat is fixedly connected to the outer wall of the pulverizing cylinder, a servo motor is fixedly connected to the connecting seat, and the output end of the servo motor is fixedly connected to the pulverizing roller.

[0013] The conducting mechanism comprises a feeding hopper, a feeding port is formed in one side of the feeding hopper, a second arc-shaped groove corresponding to the first arc-shaped groove is formed in the lower portion of the feeding hopper, sliding plates are slidably connected to the two sides of the feeding hopper through guide rails, and a telescopic hinged mechanism is arranged between the lower portion of the sliding plate and the upper portion of the connecting seat.

[0014] The telescopic hinged mechanism comprises two hydraulic cylinders arranged between the sliding plate and the connecting seat, a telescopic rod is fixedly connected to the output end of the hydraulic cylinder, the telescopic rod comprises a connecting cylinder fixedly connected to the output end of the hydraulic cylinder, and a positioning rod fixedly connected to the upper portion of the connecting seat is elastically connected to the connecting cylinder in the vertical direction.

[0015] The two sides of the guide rail are fixedly connected with mounting plates, the one side of the mounting plate is fixedly connected with a speed reducer, the output end of the speed reducer is fixedly connected with a first screw rod, the sliding plate is fixedly connected with a fixed ring, and the middle hole portion of the fixed ring is fixedly connected with a threaded sleeve in screw fit with the first screw rod.

[0016] The discharging mechanism comprises a discharging hopper fixedly connected to the lower portion of the pulverizing mechanism, and a discharging cylinder is fixedly connected to the discharging port of the discharging hopper.

[0017] The paving mechanism comprises an upper box body and a lower box body, a paving space is left between the lower box body and the conveying mechanism, the one side of the lower box body facing the discharging mechanism is fixedly connected with an inclined plate for conveying the material into the upper box body, and the side of the upper box body away from the inclined plate is rotatably connected with a pulverizing roller.

[0018] The one side of the plate body is fixedly connected with a second stepping motor, the output end of the second stepping motor is fixedly connected with a first synchronous wheel and a second synchronous wheel, one end of the pulverizing roller extends out of the upper box body and is fixedly connected with a third synchronous wheel, and the two third synchronous wheels are sleeved with a synchronous belt between the first synchronous wheel and the second synchronous wheel.

[0019] The middle part below the sliding plate is rotationally connected with a positioning cylinder, the connecting plate is fixedly connected with a third screw rod, the third screw rod is rotationally connected in the interior of the positioning cylinder, the two connecting cylinders are fixedly connected with a slip ring sleeved on the circumferential side of the positioning cylinder, a straight groove is formed in the circumferential side of the outer wall of the positioning cylinder, a spiral groove is formed at one end of the straight groove, and the inner wall of the slip ring is fixedly connected with a sliding block sliding in the interior of the slip ring.

[0020] The lower part of the slip ring is fixedly connected with a rod body, the lower part of the rod body is rotationally connected with a rotating disc, the connecting seat is fixedly connected with a guide rod, a through hole is formed in the upper part of the guide rod, a clamping rod is slidingly connected in the through hole, and the clamping rod and the rotating disc are rotationally connected. A slot matching the clamping rod is formed in the outer wall of the connecting cylinder, the clamping rod is fixedly connected with an L-shaped rod, one side of the feeding hopper is fixedly connected with a positioning plate, and a slot matching the L-shaped rod is formed in one side of the positioning plate.

[0021] Compared with the prior art, the technical scheme has the following beneficial effects, of course, any product implementing the present application does not necessarily need to achieve all the advantages described below:

[0022] 1、The conduction mechanism, the crushing mechanism, the discharging mechanism and the paving mechanism are organically combined to form a complete crushing and transporting system.

[0023] 2、The crushing mechanism and the conduction mechanism are connected in a splicing manner, when the crushing roller is maintained, the two can be directly separated, and the crushing mechanism can be quickly taken out. At this time, the maintenance personnel can directly contact the crushing roller and related parts for inspection, cleaning or replacement. This design makes the maintenance operation more convenient, saves time and reduces maintenance cost. At the same time, the crushing mechanism can be replaced or upgraded more quickly without the need for overhauling the entire equipment, improving the availability and flexibility of the equipment, ensuring the efficient and stable operation of the crusher and meeting the needs of coal mining.

[0024] 3、The setting of the material paving mechanism can effectively solve the problem of coal accumulation on the conveying belt. When the lower box contacts the conveying belt, the side wall can push the accumulated coal flat, ensuring the flat distribution of coal on the conveying belt, avoiding the influence of transmission efficiency or causing equipment failure due to excessive accumulation. In addition, when the coal is accumulated too much, the excess coal will enter the upper box along the inclined plate, the second stepping motor drives the crushing roller for secondary crushing, further processing these accumulated coal, so that the crushed coal is re-discharged onto the conveying belt, ensuring the uniformity of coal particle size on the conveying belt, improving the transportation efficiency and subsequent use quality.

[0025] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings described in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings. In the drawings:

[0027] Figure 1 is a first side structure schematic diagram of the crusher;

[0028] Figure 2 is a second side structure schematic diagram of the crusher;

[0029] Figure 3 is a first internal structure schematic diagram of the crusher;

[0030] Figure 4 is a second internal structure schematic diagram of the crusher;

[0031] Figure 5 is Figure 1 is a structure schematic diagram of the middle A;

[0032] Figure 6 is a sectional structure schematic diagram of the positioning cylinder.

[0033] In the drawings, the component list represented by each reference sign is as follows:

[0034] 1, the conduction mechanism; 101, the feed hopper; 102, the slide plate; 103, the hydraulic cylinder; 104, the telescopic rod; 105, the connecting barrel; 106, the positioning rod; 107, the mounting plate; 108, the speed reducer motor; 109, the first screw; 1010, the threaded sleeve; 2, the crushing mechanism; 201, the crushing barrel; 202, the crushing roller; 203, the connecting seat; 204, the servo motor; 3, the discharge mechanism; 301, the discharge hopper; 302, the discharge barrel; 4, the material spreading mechanism; 401, the upper box body; 402, the lower box body; 403, the inclined plate; 404, the crushing roller; 405, the second stepper motor; 406, the first synchronous wheel; 407, the second synchronous wheel; 408, the third synchronous wheel; 409, the synchronous belt; 4010, the positioning barrel; 4011, the third screw; 4012, the fixed rod; 4013, the slip ring; 4014, the straight groove; 4015, the spiral groove; 4016, the sliding block; 4017, the rod body; 4018, the rotating disc; 4019, the guide rod; 4020, the clamping rod; 4021, the L-shaped rod; 4022, the positioning plate.

[0035] It should be noted that these drawings and written descriptions are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the inventive concept to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0036] The present application will now be further described in detail with reference to the accompanying drawings.

[0037] Please refer to Figures 1-6 It is shown that in the present embodiment, a coal mining crusher is provided, which comprises a conduction mechanism 1 and a conveying mechanism, and a crushing mechanism 2 is arranged below the conduction mechanism 1. The conduction mechanism 1 can guide the excavated coal to the crushing mechanism 2, and the crushing mechanism 2 crushes the coal inside. In addition, the crushing mechanism 2 and the conduction mechanism 1 are connected in a splicing combination manner.

[0038] The discharge mechanism 3 is fixedly connected below the crushing mechanism 2, and the discharge port of the discharge mechanism 3 faces the upper side of the conveying mechanism, so as to guide the crushed coal to the upper side of the conveying mechanism.

[0039] The material spreading mechanism 4 is arranged on both sides of the discharge mechanism 3, and is located above the conveying mechanism and has a space with the conveying mechanism, so as to push the coal accumulated on the surface flat. In addition, the material spreading mechanism 4 and the discharge mechanism 3 are in sliding fit, so as to adjust the distance between the material spreading mechanism 4 and the conveying mechanism.

[0040] The conduction mechanism 1, the crushing mechanism 2, the discharging mechanism 3 and the paving mechanism 4 are organically combined to form a complete crushing and conveying system. The conduction mechanism 1 can guide the excavated coal mine to the crushing mechanism 2 smoothly, so that the coal mine can enter the crushing link accurately; the crushing mechanism 2 crushes the coal mine to meet the requirements of the subsequent conveying and use on the granularity of the coal mine; the discharging mechanism 3 conveys the crushed coal mine to the conveying mechanism to realize seamless connection of crushing and conveying; the paving mechanism 4 can level the coal mine on the conveying mechanism to prevent the coal mine from being stacked too high to affect the conveying efficiency or cause safety hazards, and the overall efficiency and reliability of the crushing and conveying of the coal mine after mining are improved.

[0041] In the embodiment, the crushing mechanism 2 comprises a crushing cylinder 201, two arc-shaped grooves are formed in the upper portion of the crushing cylinder 201, a crushing roller 202 is rotatably connected in the arc-shaped grooves, a connecting seat 203 is fixedly connected to the outer wall of the crushing cylinder 201, a servo motor 204 is fixedly connected to the connecting seat 203, and the output end of the servo motor 204 is fixedly connected to the crushing roller 202. The crushing mechanism 2 adopts the structure of the crushing cylinder 201 and the crushing roller 202, the arc-shaped grooves in the upper portion of the crushing cylinder 201 facilitate the coal mine to enter and contact the crushing roller 202, the servo motor 204 drives the crushing roller 202 to rotate to provide power for crushing, and this structure can efficiently crush the coal mine to make the coal mine reach the required granularity to provide qualified materials for the subsequent conveying and use.

[0042] In the embodiment, the conduction mechanism 1 comprises a feeding hopper 101, a feeding port is formed in one side of the feeding hopper 101, a second arc-shaped groove corresponding to a first arc-shaped groove is formed in the lower portion of the feeding hopper 101, sliding plates 102 are slidably connected to the two sides of the feeding hopper 101 through guide rails, and a telescopic hinge mechanism is arranged between the lower portion of the sliding plate 102 and the upper portion of the connecting seat 203.

[0043] In the embodiment, the telescopic hinge mechanism comprises two hydraulic cylinders 103 arranged between the sliding plate 102 and the connecting seat 203, a telescopic rod 104 is fixedly connected to the output end of the hydraulic cylinder 103, the telescopic rod 104 comprises a connecting cylinder 105 fixedly connected to the output end of the hydraulic cylinder 103, and a positioning rod 106 fixedly connected to the upper portion of the connecting seat 203 is elastically connected to the connecting cylinder 105 in the vertical direction.

[0044] In the embodiment, mounting plates 107 are fixedly connected to the two sides of the guide rail, a reduction motor 108 is fixedly connected to one side of the mounting plate 107, a first screw rod 109 is fixedly connected to the output end of the reduction motor 108, the sliding plate 102 is fixedly connected with a fixed ring, and a threaded sleeve 1010 threadedly matched with the first screw rod 109 is fixedly connected to the middle hole of the fixed ring.

[0045] The discharging mechanism 3 comprises a discharging hopper 301 fixedly connected below the crushing mechanism 2, and a discharging cylinder 302 fixedly connected to a discharging opening of the discharging hopper 301.

[0046] The paving mechanism 4 comprises the upper box body 401 and the lower box body 402, and a paving space is left between the lower box body 402 and the conveying mechanism. The lower box body 402 is fixedly connected to a side thereof facing the discharging mechanism, and a slope plate 403 is fixedly connected to the lower box body 402 and configured to convey the material into the upper box body 401. The upper box body 401 is rotatably connected to a side thereof away from the slope plate 403, and the crushing roller 202 is rotatably connected to the upper box body 401. The paving mechanism 4 is composed of the upper box body 401 and the lower box body 402, and the paving space is left between the lower box body 402 and the conveying mechanism. The slope plate 403 and the crushing roller 202 are designed to enable the paving mechanism 4 to level and secondarily crush the coal mine on the conveying mechanism. This structure not only effectively prevents the coal mine from being stacked too high during the conveying process, thereby affecting the conveying efficiency and safety, but also secondarily crushes the coal mine stacked too much, so that the particle size of the coal mine is more uniform, thereby further optimizing the conveying conditions and improving the conveying efficiency

[0047] The second stepper motor 405 is fixedly connected to one side of the plate body, and the output end of the second stepper motor 405 is fixedly connected to the first synchronous wheel 406 and the second synchronous wheel 407. One end of the crushing roller 202 extends out of the upper box body 401 and is fixedly connected to the third synchronous wheel 408. The two third synchronous wheels 408 are respectively sleeved with the synchronous belt 409 between the first synchronous wheel 406 and the second synchronous wheel 407. The second stepper motor 405 on one side of the plate body drives the two crushing rollers 202 to move simultaneously through the synchronous wheels and the synchronous belt 409. This design can ensure the synchronization of the movement of the two crushing rollers 202 and improve the crushing effect and paving quality of the paving mechanism 4 on the coal mine

[0048] The middle part of the slide plate 102 is rotatably connected to the positioning cylinder 4010, the connecting plate is fixedly connected to the third screw rod 4011, the third screw rod 4011 is rotatably connected to the inside of the positioning cylinder 4010, the two connecting cylinders 105 are fixedly connected to the slide ring 4013 sleeved on the circumferential side of the positioning cylinder 4010, the circumferential side of the outer wall of the positioning cylinder 4010 is provided with the straight groove 4014, one end of the straight groove 4014 is provided with the spiral groove 4015, and the inner wall of the slide ring 4013 is fixedly connected to the sliding block 4016 sliding in the slide ring 4013. The cooperation of the slide ring 4013, the rod body 4017, the rotating disc 4018, the guide rod 4019, the clamping rod 4020, the L-shaped rod 4021, and the positioning plate 4022 can adjust the interval between the lower box body 402 and the conveying mechanism and fix the position of the crushing mechanism 2. This structure design enables the crusher to flexibly adjust the distance between the lower box body 402 and the conveying mechanism according to actual needs during operation, so as to adapt to coal mines of different particle sizes and different conveying conditions

[0049] The lower part of the slip ring 4013 is fixedly connected with a rod body 4017, the lower part of the rod body 4017 is rotatably connected with a rotating disc 4018, the connecting seat 203 is fixedly connected with a guide rod 4019, a through hole is formed in the upper part of the guide rod 4019, a clamping rod 4020 is slidably connected in the through hole, and the clamping rod 4020 is rotatably connected with the rotating disc 4018. A notch matched with the clamping rod 4020 is formed in the outer wall of the connecting barrel 105, the clamping rod 4020 is fixedly connected with an L-shaped rod 4021, one side of the feeding hopper 101 is fixedly connected with a positioning plate 4022, and a notch matched with the L-shaped rod 4021 is formed in one side of the positioning plate 4022.

[0050] It should be noted that the rotating disc 4018 slides by driving the clamping rod 4020 through the plane thread in the prior art, and the clamping of the rotating disc 4018 can fix the positions of the positioning plate 4022 and the positioning barrel 4010, so that the interval between the lower box body 402 and the conveying mechanism can be adjusted as required.

[0051] Working principle: when it is necessary to crush the mined coal, the coal is first conveyed to the feeding port, then the coal enters the crushing barrel 201 from the feeding hopper 101, at this time, the servo motor 204 is started to drive the crushing roller 202 to rotate, and then the crushing roller 202 crushes the coal, and after crushing, the coal is discharged from the discharge hopper 301 and the discharge barrel 302 and falls onto the conveying mechanism;

[0052] When it is necessary to overhaul the crushing roller 202, the hydraulic cylinder 103 is first started to move downward, at this time, the connecting barrel 105 connected with the hydraulic cylinder 103 moves toward one side of the connecting seat 203, at this time, the connecting barrel 105 completely accommodates the positioning rod 106, and in the process of descending of the connecting barrel 105, the slip ring 4013 moves downward along the rotating barrel, in the process of movement of the slip ring 4013, the sliding block 4016 is pushed along the spiral groove 4015, thereby driving the positioning barrel 4010 to rotate, at this time, the third screw rod 4011 slides out of the positioning barrel 4010, thereby driving the lower box body 402 to move downward, and after the sliding of the sliding block 4016 along the spiral groove 4015 is completed, the sliding block 4016 slides along the sliding block 4016;

[0053] When the first pulverizing roller 202 needs to be overhauled, first rotate the rotating disc 4018, so that the rotating disc 4018 drives the L-shaped rod 4021 to slide out of the notch, and at the same time the L-shaped rod 4021 slides out of the notch, the clamping rod 4020 will slide into the clamping groove, then start the hydraulic cylinder 103, so that the hydraulic cylinder 103 pushes the pulverizing cylinder 201 to move downward, until the pulverizing roller 202 completely slides out of the feed hopper 101, after the pulverizing roller 202 completely slides out, at this time start the speed reducer motor 108, the speed reducer motor 108 drives the pulverizing cylinder 201 to move to one side through the cooperation between the first screw rod 109 and the threaded sleeve 1010, so that the pulverizing roller 202 is exposed, thereby facilitating the subsequent personnel to overhaul.

[0054] When the transmission mechanism is a conveying belt, coal mines will accumulate on the surface of the conveying belt, at this time the coal mines will contact the lower box body 402 during transportation, at this time the side wall of the lower box will push the accumulated coal mines flat, realizing the effect of paving, if the coal mines accumulate during transportation, at this time the excess coal mines will enter the upper box body 401 along the slope, at this time start the second step motor 405, the second synchronous motor will determine the rotation of the second pulverizing roller 202 through the cooperation of the synchronous belt 409 wheel, so as to pulverize the coal mines again, then the pulverized coal mines will be discharged from the discharge port of the upper box body 401 to the conveying belt.

[0055] The present application is not limited to the above-mentioned embodiments, anyone should know that the structural changes made under the inspiration of the present application, any technical solution with the same or similar to the present application, falls within the scope of the present application. The technical, shape, structure part not described in detail in the present application is a known technology.

Claims

1. A crusher for coal mining, characterized in that, include: The transmission mechanism (1) and the transport mechanism are provided. A crushing mechanism (2) is provided below the transmission mechanism (1). The transmission mechanism (1) can guide the excavated coal to the crushing mechanism (2), and the crushing mechanism (2) crushes the coal inside. In addition, the crushing mechanism (2) and the transmission mechanism (1) are connected in a splicing combination. The crushing mechanism (2) is fixedly connected to the discharge mechanism (3) below. The discharge port of the discharge mechanism (3) faces the top of the transport mechanism so as to transfer the crushed coal to the top of the transport mechanism. Both sides of the discharge mechanism (3) are provided with a spreading mechanism (4). The spreading mechanism (4) is located above the transmission mechanism and has space with the transmission mechanism to push the coal piled on the surface to flatten it. In addition, the spreading mechanism (4) and the discharge mechanism (3) are in sliding fit to adjust the distance between them.

2. The crusher for coal mining according to claim 1, characterized in that, The crushing mechanism (2) includes a crushing cylinder (201). Two arc-shaped grooves are opened on the top of the crushing cylinder (201). A crushing roller (202) is rotatably connected inside the arc-shaped grooves. A connecting seat (203) is fixedly connected to the outer wall of the crushing cylinder (201). A servo motor (204) is fixedly connected to the connecting seat (203). The output end of the servo motor (204) is fixedly connected to the crushing roller (202).

3. A crusher for coal mining according to claim 1, characterized in that, The transmission mechanism (1) includes a feeding hopper (101), a feeding port is provided on one side of the feeding hopper (101), and a second arc groove corresponding to the first arc groove is provided below the feeding hopper (101). Both sides of the feeding hopper (101) are slidably connected to a slide plate (102) via a guide rail. A telescopic hinge mechanism is provided between the lower part of the slide plate (102) and the upper part of the connecting seat (203).

4. A crusher for coal mining according to claim 1, characterized in that, The telescopic hinge mechanism includes two hydraulic cylinders (103) located between the slide plate (102) and the connecting seat (203). The output end of the hydraulic cylinder (103) is fixedly connected to a telescopic rod (104). The telescopic rod (104) includes a connecting cylinder (105) fixed between the output end of the hydraulic cylinder (103). The connecting cylinder (105) is elastically connected in the vertical direction to a positioning rod (106) fixedly connected above the connecting seat (203).

5. A crusher for coal mining according to claim 1, characterized in that, Mounting plates (107) are fixedly connected to both sides of the guide rail. A geared motor (108) is fixedly connected to one side of the mounting plate (107). A first screw (109) is fixedly connected to the output end of the geared motor (108). A fixing ring is fixedly connected to the slide plate (102). A threaded sleeve (1010) that is threaded with the first screw (109) is fixedly connected to the middle hole of the fixing ring.

6. A crusher for coal mining according to claim 1, characterized in that, The discharge mechanism (3) includes a discharge hopper (301) fixedly connected below the crushing mechanism (2), and a discharge cylinder (302) is fixedly connected to the discharge port of the discharge hopper (301).

7. A crusher for coal mining according to claim 1, characterized in that, The material spreading structure includes an upper box (401) and a lower box (402). There is a material spreading space between the lower box (402) and the conveying mechanism. An inclined plate (403) that conveys the material to the upper box (401) is fixedly connected to the side of the lower box (402) facing the discharge structure. A crushing roller (404) is rotatably connected to the side of the upper box (401) away from the inclined plate (403).

8. A crusher for coal mining according to claim 1, characterized in that, A second stepper motor (405) is fixedly connected to one side of the plate. The output end of the second stepper motor (405) is fixedly connected to a first synchronous pulley (406) and a second synchronous pulley (407). One end of the crushing roller (202) extends out of the upper box (401) and is fixedly connected to a third synchronous pulley (408). Synchronous belts (409) are respectively fitted between the two third synchronous pulleys (408) and the first synchronous pulley (406) and the second synchronous pulley (407).

9. A crusher for coal mining according to claim 1, characterized in that, A positioning cylinder (4010) is rotatably connected to the middle part below the slide plate (102). A third screw (4011) is threaded inside the positioning cylinder (4010). A fixing rod (4012) is fixedly connected to one end of the third screw (4011). One end of the fixing plate is fixedly connected to the plate body. A slip ring (4013) sleeved on the periphery of the positioning cylinder (4010) is fixedly connected between the two connecting cylinders (105). A straight groove (4014) is opened on the periphery of the outer wall of the positioning cylinder (4010). A spiral groove (4015) is extended at one end of the straight groove (4014). A slider (4016) that slides inside the slip ring (4013) is fixedly connected to the inner wall of the slip ring (4013).

10. A crusher for coal mining according to claim 1, characterized in that, A rod (4017) is fixedly connected to the lower part of the slip ring (4013), and a rotating disk (4018) is rotatably connected to the lower part of the rod (4017). A guide rod (4019) is fixedly connected to the connecting seat (203). A through hole is opened above the guide rod (4019), and a locking rod (4020) is slidably connected in the through hole. The locking rod (4020) and the rotating disk (4018) are rotatably connected. A slot that matches the locking rod (4020) is opened on the outer wall of the connecting cylinder (105). An L-shaped rod (4021) is fixedly connected to the locking rod (4020). A positioning plate (4022) is fixedly connected to one side of the feed hopper (101), and a slot that matches the L-shaped rod (4021) is opened on one side of the positioning plate (4022).

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