Adjustable particle size straw hammer piece type crushing device and use method

Abstract

The application relates to the technical field of agricultural machinery, and discloses a straw hammer piece type crushing device capable of adjusting particle size and a use method, which comprises a rack, a machine shell is fixedly connected to the top of the rack, a crushing cavity is arranged in the machine shell, a first driving motor is fixedly connected to the outer wall of the machine shell, a first rotating shaft is fixedly connected to the output end of the first driving motor, a crushing mechanism is arranged on the outer wall of the first rotating shaft, an adjusting mechanism is arranged in the machine shell, a driving mechanism is arranged on the outer wall of the machine shell, a reciprocating assembly is arranged at the bottom of the machine shell, the crushing mechanism comprises a plurality of connecting frames and a plurality of annular teeth, and the middle portions of the plurality of connecting frames are fixedly connected to the outer wall of the first rotating shaft. A rotatable cylinder and a plurality of screen meshes arranged on the cylinder are arranged, and a second driving motor is used to drive the rotation of the cylinder through a circular gear and an external tooth ring. The structure realizes quick adjustment of the crushing particle size during the operation of the equipment, and the operator does not need to stop the machine to replace the screen mesh.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, specifically to an adjustable-particle-size straw hammer crusher and its usage method. Background Technology

[0002] Straw, as an important agricultural resource, plays a vital role in environmental protection and sustainable agricultural development. Before being used as feed, fuel, or substrate for further processing, straw typically needs to be pulverized to reduce particle size. Hammer mills, due to their simple structure, high production efficiency, and strong adaptability, are widely used in the primary pulverization of straw.

[0003] Existing straw hammer mills primarily rely on high-speed rotating hammers to impact and collide with the material to achieve crushing. However, these traditional devices present several problems in practical applications. Firstly, existing mills mainly control particle size through fixedly installed screens. If the user needs to change the particle size of the crushed material, the machine must be stopped for manual disassembly and replacement of screens with different apertures. This process is cumbersome and time-consuming, significantly reducing the equipment's production flexibility and efficiency.

[0004] On the other hand, straw contains a large amount of fiber, which easily entangles and adheres to the screen, especially when crushing materials with finer particle sizes, making screen clogging a more prominent problem. Once the screen becomes clogged, it not only leads to a sharp drop in crushing efficiency and increased energy consumption, but also affects the normal discharge of materials and may even cause material to accumulate in the crushing chamber, affecting the safe operation of the equipment. Traditional solutions often rely on manual cleaning or passive vibration cleaning, which has limited cleaning effectiveness and cannot completely solve the problem of fibrous material adhesion. Therefore, an adjustable particle size straw hammer mill device and its usage method are proposed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an adjustable particle size straw hammer mill device and its usage method, which solves the problem of screen clogging, especially when the straw material contains a large amount of fiber, which easily entangles and adheres to the screen, particularly when it is necessary to crush materials with finer particle sizes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an adjustable particle size straw hammer mill device, comprising a frame, a housing fixedly connected to the top of the frame, a crushing chamber inside the housing, a first drive motor fixedly connected to the outer wall of the housing, a first rotating shaft fixedly connected to the output end of the first drive motor, a crushing mechanism provided on the outer wall of the first rotating shaft, an adjustment mechanism provided inside the housing, a drive mechanism provided on the outer wall of the housing, and a reciprocating assembly provided at the bottom of the housing; The crushing mechanism includes multiple connecting frames and multiple annular teeth. The middle of each of the multiple connecting frames is fixedly connected to the outer wall of the first rotating shaft. At least four connecting rods are rotatably connected to the outer wall of the connecting frame. A hammer is fixedly connected to the side of the connecting rod away from the connecting frame. Multiple strip teeth are fixedly connected to the side of the hammer away from the connecting rod. The multiple annular teeth are fixedly connected to the inner wall of the crushing chamber.

[0007] Preferably, the adjusting mechanism includes a cylinder, the outer wall of which is rotatably connected to the inner wall of the housing, the outer wall of which is provided with at least two mesh screens, and an external toothed ring is fixedly connected to the outer wall of which.

[0008] Preferably, the drive mechanism includes a bracket, which is fixedly connected to the outer wall of the housing. A second drive motor is fixedly connected to the bottom of the bracket. A disk is fixedly connected to the output end of the second drive motor. An eccentric shaft is fixedly connected to the outer edge of the disk. A third rotating shaft is fixedly connected to the side of the disk away from the second drive motor. Multiple sector gears are fixedly connected to the outer wall of the third rotating shaft. A second rotating shaft is rotatably connected to the inner wall of the bracket. A cam is fixedly connected to the outer wall of the second rotating shaft near the disk. Multiple cam grooves are formed on the outer wall of the cam. A spur gear is fixedly connected to the outer wall of the second rotating shaft away from the disk.

[0009] Preferably, the reciprocating assembly includes a guide rod, which is fixedly connected to the inner wall of the housing. A slide plate is slidably connected to the outer wall of the guide rod, and a rack plate is fixedly connected to the top of the slide plate. A cleaning assembly is provided on the outer wall of the guide rod, and a first spring is sleeved on the outer wall of the guide rod. A limit block is fixedly connected to the side of the guide rod away from the housing.

[0010] Preferably, the cleaning assembly includes a cleaning plate, which is fixedly connected to the outer wall of the slide plate. A limit plate is slidably connected inside the cleaning plate. A plurality of second springs are fixedly connected to the bottom of the limit plate. A connecting plate is fixedly connected to the top of the limit plate. A plurality of brushes are fixedly connected to the top of the connecting plate.

[0011] Preferably, the outer wall of the housing is fixedly connected to a feed inlet, the bottom of the housing is provided with a discharge outlet, and the annular teeth and the strip teeth are arranged at intervals.

[0012] Preferably, the spur gear meshes with the external gear ring, the sector gear meshes with the rack plate, and the outer wall of the eccentric shaft is slidably connected to the inner wall of the cam groove.

[0013] Preferably, one end of the first spring is fixedly connected to the inner wall of the housing, and the other end of the first spring is fixedly connected to the outer wall of the slide plate.

[0014] Preferably, a sliding rod is fixedly connected to the bottom of the cleaning plate, and a sliding groove is provided on the outer wall of the housing, with the outer wall of the sliding rod slidably connected inside the sliding groove.

[0015] A method for using a straw hammer mill with adjustable particle size includes the following steps: S1. Start the first drive motor to drive the first rotating shaft and hammer to rotate at high speed. After the straw enters the crushing chamber, it is crushed by the impact and shearing of the hammer, strip teeth and inner wall ring teeth. The crushed material is discharged through the screen on the cylinder.

[0016] S2. Start the second drive motor, which drives the external gear ring to rotate the cylinder through the transmission of the cam and the spur gear, thereby changing the mesh size of the working position and realizing the adjustment of the discharge particle size.

[0017] S3. The second drive motor synchronously drives the sector gear to rotate, meshing with the rack plate to drive the slide plate to reciprocate linearly along the guide rod. The slide plate drives the brush to perform flexible brushing and cleaning of the inner wall of the machine casing and the screen.

[0018] S4. Stop feeding and wait for the material in the crushing chamber to be emptied before turning off the power to each drive motor in sequence.

[0019] This invention provides a straw hammer mill with adjustable particle size and its method of use. It has the following beneficial effects: 1. This invention features a rotatable cylinder with multiple screens, driven by a second drive motor via a spur gear and an external gear ring. This structure allows for rapid adjustment of the crushed particle size during equipment operation. Operators can switch to the desired screen size without stopping the machine to change screens, thus improving the equipment's adaptability to different processing needs and production flexibility.

[0020] 2. This invention utilizes the same second drive motor to simultaneously drive the cylinder to adjust the particle size, and through the meshing of the sector gear and rack plate, synchronously drives the cleaning component to perform reciprocating linear motion along the screen surface. This linked cleaning method can automatically and continuously remove material residues adhering to the screen holes, effectively preventing blockage, ensuring smooth discharge and stable screening efficiency, and reducing manual maintenance costs.

[0021] 3. This invention incorporates strip-shaped teeth on the hammer blades, which interlock with annular teeth fixed to the inner wall of the crushing chamber. Upon entering the crushing chamber, the straw is subjected not only to the high-speed impact of the hammer blades but also to the shearing, tearing, and grinding effects generated between the strip-shaped and annular teeth. This combination of multiple crushing mechanisms significantly improves the crushing efficiency and fineness of straw fibers compared to traditional single-impact crushing. Attached Figure Description

[0022] Figure 1This is a first-view perspective perspective view of the present invention; Figure 2 This is a second-view perspective perspective view of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a cross-sectional view of the casing of the present invention; Figure 5 This is a schematic diagram of the second drive motor of the present invention; Figure 6 This is a schematic diagram of the connecting frame of the present invention; Figure 7 for Figure 6 Enlarged view at point B in the middle; Figure 8 This is a schematic diagram of the cylinder of the present invention; Figure 9 This is a schematic diagram of the connecting rod of the present invention; Figure 10 This is a schematic diagram of the skateboard of the present invention; Figure 11 for Figure 10 Enlarged view at point C; Figure 12 This is a cross-sectional view of the cleaning plate of the present invention.

[0023] The components are as follows: 1. Frame; 2. Housing; 3. Crushing chamber; 4. First drive motor; 5. Connecting frame; 6. Connecting rod; 7. Hammer blade; 8. Strip tooth; 9. Ring tooth; 10. Cylinder; 11. Screen; 12. External toothed ring; 13. Second drive motor; 14. Disc; 15. Eccentric shaft; 16. Second rotating shaft; 17. Cam; 18. Cam groove; 19. Circular gear; 20. Third rotating shaft; 21. Sector gear; 22. Guide rod; 23. Slide plate; 24. Rack plate; 25. Cleaning plate; 26. Limiting plate; 27. Second spring; 28. Connecting plate; 29. ​​Brush; 30. Limiting block; 31. First spring; 32. Support; 33. Feed inlet; 34. Slide groove; 35. Slide rod; 36. First rotating shaft. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example: Please see the appendix Figure 1 -Appendix Figure 12This invention provides a straw hammer mill with adjustable particle size, comprising a frame 1. A housing 2 is fixedly connected to the top of the frame 1, and a crushing chamber 3 is provided inside the housing 2. A feed inlet 33 is fixedly connected to the outer wall of the housing 2, and a discharge outlet is provided at the bottom.

[0026] A first drive motor 4 is fixedly connected to the outer wall of the casing 2, and its output end is fixedly connected to a first rotating shaft 36 horizontally disposed within the crushing chamber 3. A crushing mechanism is mounted on the first rotating shaft 36 for impacting and crushing the straw. An adjustment mechanism is provided inside the casing 2 to change the particle size of the crushed material. A drive mechanism is provided on the outer wall of the casing 2 to simultaneously drive the adjustment mechanism and the reciprocating cleaning assembly. The bottom of the casing 2 is equipped with the reciprocating assembly and the cleaning assembly to prevent material blockage in the screening area.

[0027] The crushing mechanism is the core component for performing the crushing function. This mechanism includes multiple connecting frames 5 spaced axially along the first rotating shaft 36. Each connecting frame 5 has at least four connecting rods 6 rotatably connected to its outer wall via pins. The number and distribution of the connecting rods 6 can be designed according to the processing capacity and crushing intensity requirements. A hammer blade 7 is fixedly connected to the end of each connecting rod 6 away from the connecting frame 5. As the main impact component, the hammer blade 7 has multiple strip-shaped teeth 8 fixedly connected to its working surface away from the connecting rods 6. These strip-shaped teeth 8 are used to increase the shearing and kneading action on the material during the crushing process.

[0028] On the inner wall of the crushing chamber 3, multiple annular teeth 9 are fixedly connected, arranged alternately with the strip-shaped teeth 8 on the hammer blades 7. When the first drive motor 4 drives the first rotating shaft 36 to rotate at high speed, it drives the hammer blades 7 and the strip-shaped teeth 8 to rotate together. The straw fed into the crushing chamber 3 is subjected to repeated impacts, collisions, shearing, and friction between the high-speed moving hammer blades 7 and the fixed annular teeth 9, thereby achieving effective crushing. The rotating connection between the connecting rod 6 and the connecting frame 5 allows the hammer blades 7 to swing at a certain angle when encountering hard objects, playing a buffering and protective role.

[0029] The adjusting mechanism specifically implements the particle size control function. This mechanism includes a cylinder 10 fitted around the outside of the crushing mechanism, which is rotatably connected to the inner wall of the housing 2 via an external toothed ring 12. At least two screens 11 with different screening characteristics are provided on the circumferential wall of the cylinder 10. For example, these screens 11 can have different mesh diameters, such as the first screen having a 10 mm mesh diameter and the second screen having a 5 mm mesh diameter. The external toothed ring 12 is fixedly connected to the outer wall of the cylinder 10.

[0030] By driving the cylinder 10 to rotate, different aperture screens 11 can be switched to the discharge position, thereby directly changing the maximum allowable particle size of the material. As another implementation, the screen 11 can also be designed as a single structure with a gradually changing aperture ratio along the circumference. By rotating the cylinder 10, its effective screening area can be changed, thereby indirectly adjusting the discharge rate and particle fineness.

[0031] The drive mechanism provides power to the adjustment mechanism and the reciprocating assembly. This mechanism includes a bracket 32 ​​fixed to the outer wall of the housing 2. A second drive motor 13 is mounted at the bottom of the bracket 32. A disc 14 is fixedly connected to the output end of the second drive motor 13, and an eccentric shaft 15 is fixed to the edge of the disc 14. A third rotating shaft 20 is coaxially fixed to the disc 14, and multiple sector gears 21 are fixed on the third rotating shaft 20.

[0032] A second rotating shaft 16 is rotatably connected within the bracket 32 ​​via bearings. A cam 17 is fixedly connected to the second rotating shaft 16, and a cam groove 18 is formed on the cam 17. An eccentric shaft 15 is embedded in and slidably connected within the cam groove 18. A spur gear 19 is fixed to the end of the second rotating shaft 16 away from the disc 14. The spur gear 19 is engaged with the outer gear ring 12 of the adjusting mechanism.

[0033] Therefore, after the second drive motor 13 is started, the rotational motion of the disc 14 is converted into the rotation of the second rotating shaft 16 through the cooperation of the eccentric shaft 15 and the cam groove 18, and then through the meshing of the spur gear 19 and the external gear ring 12, the cylinder 10 is finally driven to rotate.

[0034] Through the linkage design of the aforementioned drive mechanism, the single power source output of the second drive motor 13 is converted into two different motion modes: one mode drives the eccentric shaft 15 to slide within the cam groove 18 via the disc 14, thereby driving the cam 17 and the second rotating shaft 16 to rotate, ultimately driving the cylinder 10 to adjust the screen position via the circular gear 19; the other mode drives the sector gear 21 to rotate intermittently via the third rotating shaft 20, providing power for subsequent cleaning operations. This achieves synchronous or correlated control of the adjustment and cleaning processes by a single motor, simplifying the equipment structure. The reciprocating assembly achieves regular linear reciprocating motion. This assembly includes a guide rod 22 fixed to the inner wall of the housing 2. A slide plate 23 is fitted onto the guide rod 22 and forms a sliding connection with it. A rack plate 24 is fixed to the top of the slide plate 23. A sector gear 21 in the drive mechanism meshes with the rack plate 24, converting the rotational motion into linear reciprocating motion of the slide plate 23 along the guide rod 22. A first spring 31 is fitted onto the guide rod 22, one end of which is connected to the inner wall of the housing 2, and the other end is connected to the slide plate 23, providing a restoring force and buffering impacts. A limit block 30 is fixed to the end of the guide rod 22 to limit the maximum stroke of the slide plate 23.

[0035] The cleaning assembly directly performs the cleaning task. This assembly includes a cleaning plate 25 fixed to a slide plate 23. A sliding limit plate 26 is provided within the cleaning plate 25, and multiple second springs 27 connect the bottom of the limit plate 26 to the cleaning plate 25. A connecting plate 28 is fixed to the top of the limit plate 26, and multiple brushes 29 are mounted on the connecting plate 28. The second springs 27 provide continuous elastic support, allowing the brushes 29 to always contact the surface being cleaned, such as the strainer 11 or the inner wall of the housing, with appropriate pressure, achieving flexible cleaning and avoiding damage to components caused by rigid scraping.

[0036] Through the cooperation of the reciprocating component and the cleaning component, when the sector gear 21 rotates and meshes with the rack plate 24, the drive slide plate 23 overcomes the resistance of the first spring 31 and moves along the guide rod 22. When the sector gear 21 rotates through the toothed area and disengages, the slide plate 23 returns to its original position under the action of the first spring 31, thus forming a reciprocating motion. During this process, the brush 29 is always in contact with the screen 11 and brushes it under the elastic push of the second spring 27. This not only removes the attached debris and prevents the screen from clogging, but also avoids damage to the screen 11 caused by rigid scraping due to the elastic contact method, thus ensuring the long-term stable operation of the device.

[0037] To further ensure the stability of the cleaning component's movement, a slide rod 35 is fixed to the bottom of the cleaning plate 25, and a corresponding groove 34 is provided on the outer wall of the housing 2. The slide rod 35 slides within the groove 34, forming an auxiliary guide.

[0038] This invention also provides a method for using an adjustable particle size straw hammer mill, comprising the following steps: S1. Start the first drive motor 4: Connect the power supply and start the first drive motor 4, driving the first rotating shaft 36 to rotate at high speed. The first rotating shaft 36 drives the hammers 7 on the connecting frame 5 and connecting rod 6 to rotate at high speed. The straw enters the crushing chamber 3 through the feed inlet 33 and is impacted, sheared and crushed by the hammers 7 and their strip-shaped teeth 8. During the crushing process, the strip-shaped teeth 8 cooperate with the annular teeth 9 on the inner wall of the crushing chamber to improve the crushing efficiency and effect. The crushed material is discharged from the discharge port at the bottom of the casing 2 through the strainer 11 on the adjusting mechanism.

[0039] S2. Start the second drive motor 13: Start the second drive motor 13 to drive the disc 14 to rotate. The disc 14 indirectly drives the second rotating shaft 16 to rotate through the sector gear 21 on the third rotating shaft 20 connected to the same axis and the cam 17 on the second rotating shaft 16. The sprocket 19 on the second rotating shaft 16 meshes with the outer gear ring 12 of the adjusting mechanism. The sprocket 19 drives the cylinder 10 to rotate under the action of the outer gear ring 12. After the cylinder 10 rotates, the sieve 11 set on it changes its aperture, thereby adjusting the particle size of the crushed material.

[0040] S3. When the second drive motor 13 drives the disc 14 to rotate, the sector gear 21 on the third rotating shaft 20 also rotates synchronously. The sector gear 21 meshes with the rack plate 24 of the reciprocating assembly, converting the rotational motion into the reciprocating linear motion of the slide plate 23. The slide plate 23 drives the cleaning plate 25 fixed to the side to move back and forth. The limiting plate 26 inside the cleaning plate 25 is elastically supported by the second spring 27, and the brush 29 at the top extends out. When the slide plate 23 moves back and forth, the brush 29 brushes and cleans the strainer 11 to prevent straw residue from adhering or clogging. The slide bar 35 slides in the slide groove 34 to assist the cleaning plate 25 in stabilizing the reciprocating motion. During the reciprocating motion, the first spring 31 is compressed and released, assisting the slide plate 23 to complete the reciprocating stroke and stop at the limiting block 30.

[0041] S4. After the crushing operation is completed, close the feed inlet 33. After the material in the crushing chamber 3 is emptied, turn off the first drive motor 4 and the second drive motor 13 in sequence, and cut off the power supply to the equipment.

Claims

1. A straw hammer mill device with adjustable particle size, comprising a frame (1), characterized in that, The top of the frame (1) is fixedly connected to the housing (2), the housing (2) has a crushing chamber (3) inside, the outer wall of the housing (2) is fixedly connected to the first drive motor (4), the output end of the first drive motor (4) is fixedly connected to the first rotating shaft (36), the outer wall of the first rotating shaft (36) is provided with a crushing mechanism, the housing (2) has an adjustment mechanism inside, the outer wall of the housing (2) is provided with a drive mechanism, and the bottom of the housing (2) is provided with a reciprocating assembly; The crushing mechanism includes multiple connecting frames (5) and multiple annular teeth (9). The middle of each of the multiple connecting frames (5) is fixedly connected to the outer wall of the first rotating shaft (36). At least four connecting rods (6) are rotatably connected to the outer wall of each connecting frame (5). A hammer (7) is fixedly connected to the side of each connecting rod (6) away from the connecting frame (5). Multiple strip teeth (8) are fixedly connected to the side of each hammer (7) away from the connecting rod (6). The multiple annular teeth (9) are fixedly connected to the inner wall of the crushing chamber (3). The adjustment mechanism includes a cylinder (10), the outer wall of the cylinder (10) is rotatably connected to the inner wall of the housing (2), the outer wall of the cylinder (10) is provided with at least two mesh screens (11) with different apertures, and the outer wall of the cylinder (10) is fixedly connected with an external toothed ring (12). The drive mechanism includes a bracket (32), which is fixedly connected to the outer wall of the housing (2). A second drive motor (13) is fixedly connected to the bottom of the bracket (32). A disk (14) is fixedly connected to the output end of the second drive motor (13). An eccentric shaft (15) is fixedly connected to the outer edge of the disk (14). A third rotating shaft (20) is fixedly connected to the side of the disk (14) away from the second drive motor (13). Multiple sector gears (21) are fixedly connected to the outer wall of the third rotating shaft (20). A second rotating shaft (16) is rotatably connected to the inner wall of the bracket (32). The second rotating shaft (16) is parallel to the third rotating shaft (20). A cam (17) is fixedly connected to the outer wall of the second rotating shaft (16) near the disk (14). Multiple cam grooves (18) are opened on the outer wall of the cam (17). A spur gear (19) is fixedly connected to the outer wall of the second rotating shaft (16) away from the disk (14). The reciprocating assembly includes a guide rod (22), which is fixedly connected to the inner wall of the housing (2). A slide plate (23) is slidably connected to the outer wall of the guide rod (22). A rack plate (24) is fixedly connected to the top of the slide plate (23). A cleaning assembly is provided on the outer wall of the slide plate (23). A first spring (31) is sleeved on the outer wall of the guide rod (22). A limit block (30) is fixedly connected to the side of the guide rod (22) away from the housing (2). The cleaning assembly includes a cleaning plate (25), which is fixedly connected to the outer wall of the slide plate (23). A limiting plate (26) is slidably connected inside the cleaning plate (25). A plurality of second springs (27) are fixedly connected to the bottom of the limiting plate (26). A connecting plate (28) is fixedly connected to the top of the limiting plate (26). A plurality of brushes (29) are fixedly connected to the top of the connecting plate (28). The spur gear (19) meshes with the external gear ring (12), the sector gear (21) meshes with the rack plate (24), and the outer wall of the eccentric shaft (15) is slidably connected to the inner wall of the cam groove (18). One end of the first spring (31) is fixedly connected to the inner wall of the housing (2), and the other end of the first spring (31) is fixedly connected to the outer wall of the slide plate (23).

2. The straw hammer mill crusher with adjustable particle size according to claim 1, characterized in that, The outer wall of the housing (2) is fixedly connected to the feed inlet (33), and the bottom of the housing (2) is provided with a discharge outlet. The annular teeth (9) and the strip teeth (8) are arranged at intervals.

3. The straw hammer mill crusher with adjustable particle size according to claim 1, characterized in that, The bottom of the cleaning plate (25) is fixedly connected to a slide rod (35), and the outer wall of the housing (2) is provided with a slide groove (34). The outer wall of the slide rod (35) is slidably connected to the inside of the slide groove (34).

4. A method of using an adjustable particle size straw hammer mill crusher, applied to the adjustable particle size straw hammer mill crusher described in any one of claims 1-3, characterized in that, Includes the following steps: S1. Start the first drive motor (4) to drive the first rotating shaft (36) and hammer (7) to rotate at high speed. After the straw enters the crushing chamber (3), it is crushed by the impact and shearing of the hammer (7), strip teeth (8) and inner wall ring teeth (9). After crushing, the material is discharged through the screen (11) on the cylinder (10). S2. Start the second drive motor (13), and drive the external gear ring (12) to rotate the cylinder (10) through the transmission of the cam (17) and the spur gear (19), thereby changing the specifications of the mesh (11) in the working position and realizing the adjustment of the discharge particle size; S3. The second drive motor (13) synchronously drives the sector gear (21) to rotate, meshing with the rack plate (24) to drive the slide plate (23) to reciprocate linearly along the guide rod (22). The slide plate (23) drives the brush (29) to perform flexible brushing and cleaning of the inner wall of the casing and the screen. S4. Stop feeding and wait for the material in the crushing chamber (3) to be emptied before turning off the power to each drive motor in sequence.

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