Efficient pulverizer

Abstract

The efficient pulverizer comprises a pulverizing bin, a rotating shaft, a plurality of movable cutter sets and a plurality of fixed cutter sets, movable blades in the movable cutter sets and fixed blades in the fixed cutter sets are alternately arranged at intervals in the axial direction of the rotating shaft, a plurality of sliding strips are arranged on the inner wall of the pulverizing bin in the axial direction of the rotating shaft in a sliding mode, and the fixed cutter sets are installed on the sliding strips. An elastic reset piece is connected between one end of the sliding strip and the smashing bin, a magnetic repulsive force assembly is arranged between the other end of the sliding strip and the end of the rotating shaft, and when the rotating shaft rotates, thrust in the axial direction of the rotating shaft is intermittently generated on the sliding strip through the magnetic repulsive force assembly, so that the fixed cutter set conducts small-amplitude reciprocating sliding in the axial direction of the rotating shaft. A limiting structure is arranged on the inner wall of the smashing bin and used for limiting the fixed blades to be located between every two adjacent movable blades distributed in the axial direction of the rotating shaft all the time. When the rotating shaft rotates, a dynamically changing shearing gap is formed between the fixed blade and the rotating movable blade, and fiber agglomerates possibly formed by tough soft plastic or materials clamped among the blades can be actively crushed and cleaned.

Description

Technical Field

[0001] This application relates to the technical field of plastic recycling equipment, and in particular to a high-efficiency crusher. Background Technology

[0002] With the rapid development of my country's comprehensive national strength and the continuous progress of society, plastic, as a major source of waste in people's daily lives, not only occupies a lot of space but also pollutes the air, soil, and water. Furthermore, its long degradation cycle has made it one of the major environmental problems facing humanity. Recycling and reusing plastic can not only generate economic benefits but also solve the problem of environmental pollution.

[0003] Among them, the waste plastic recycling crusher is the core equipment in the waste plastic recycling and processing industry chain. It is mainly used to crush waste plastic products (such as PET bottles, PE films, PVC pipes, etc.) to the target particle size for subsequent cleaning, granulation and other processes. The typical structure of the current mainstream waste plastic crusher includes components such as a feeding hopper, a cavity, a fixed blade group, a moving blade group, a screen and a maintenance door. Its working principle is as follows: the material enters the cavity through the feeding hopper, and the moving blade group driven by the main shaft forms a relative cutting motion with the fixed blade group fixed on the inner wall of the cavity. The material is crushed by shearing, tearing and impact. The crushed material is classified by the particle size of the screen. The material that does not meet the standard continues to be crushed in the cavity, while the material that meets the standard is discharged through the screen. The maintenance door is used for replacing worn parts (such as fixed blades, moving blades, screen) or cleaning the cavity during regular maintenance.

[0004] However, waste plastics are only roughly sorted during recycling. In the actual crushing process, hard and soft plastics are still mixed together. The soft plastics that are partially crushed can easily wrap around hard plastic pieces and get stuck between adjacent blades, affecting the recycling efficiency of waste plastics. After being stuck for a long time, it can also easily cause motor overload and blade wear, increasing the difficulty of maintenance. Summary of the Invention

[0005] In order to improve the problems caused by soft plastics easily wrapping around hard plastic blocks and getting stuck between adjacent blades during waste plastic crushing, resulting in motor overload, blade wear, and reduced crushing efficiency, this application provides a high-efficiency crusher.

[0006] The high-efficiency pulverizer provided in this application adopts the following technical solution: A high-efficiency pulverizer includes a pulverizing chamber, a rotating shaft, multiple moving blade groups, and multiple fixed blade groups. The moving blades in the moving blade groups and the fixed blades in the fixed blade groups are alternately spaced along the axial direction of the rotating shaft to form a shearing zone. Multiple slide bars are slidably arranged on the inner wall of the pulverizing chamber along the axial direction of the rotating shaft. The fixed blade groups are mounted on the slide bars. One end of the slide bar is connected to the pulverizing chamber with an elastic reset member, and the other end is provided with a magnetic repulsion component between it and the end of the rotating shaft. When the rotating shaft rotates, the magnetic repulsion component intermittently generates a thrust along the axial direction of the rotating shaft on the slide bar, causing the fixed blade groups to slide back and forth with a small amplitude along the axial direction of the rotating shaft. The inner wall of the crushing chamber is provided with a limiting structure to ensure that the fixed blade is always located between two adjacent moving blades distributed along the axis of rotation.

[0007] Furthermore, the fixed blade is provided with a cutting edge on the side facing the rotation direction of the rotating shaft, and the cutting edge includes a root, a cutting part and a shoulder arranged in sequence; Both the root and the shoulder are arc-shaped and their arc directions are opposite. The outer arc side of the root faces the direction of rotation of the shaft, and the cutting part smoothly connects the root and the shoulder. The tip of the moving blade extends at least beyond the cutting section.

[0008] Furthermore, the cutting portion is configured as a serrated edge.

[0009] Furthermore, the moving blade is provided with a plurality of arc-shaped chip discharge ports spaced apart, and a chip discharge cover that partially covers the chip discharge ports is fixed to the moving blade at the chip discharge ports. The chip discharge cover opens on one side in the direction of rotation and communicates with the chip discharge ports. The gap between the back of the chip conveyor and the moving blade gradually decreases along the rotation direction of the moving blade, and a serrated blade extending to the front of its opening is fixed to the back of the chip conveyor. Multiple chip removal covers are arranged on both sides of the moving blade.

[0010] Furthermore, the curvature of the serrated edge relative to the axis of rotation gradually increases along the rotation direction of the moving blade.

[0011] Furthermore, the multiple moving blades in the moving blade group are distributed in a circumferential array with equal spacing around the axis of rotation, and the moving blades in two adjacent moving blade groups are set at different mounting angles.

[0012] Furthermore, the magnetic repulsion component includes: The moving disc is coaxially fixed to the end of the rotating shaft; The permanent magnets are arranged in a fan shape and are distributed in an equally spaced circular array on the side of the moving disk away from the axis of rotation. An electromagnet, mounted at the end of the slider and spaced apart from the permanent magnet on the moving plate, repels the permanent magnet when energized; and The magnetic repulsion controller is configured to control the on / off state of the electromagnet via pulses.

[0013] Furthermore, a power motor for driving the rotating shaft is provided outside the crushing chamber, and the magnetic repulsion controller is also configured to control the pulse frequency of the electromagnet to be positively correlated with the output speed of the power motor.

[0014] Furthermore, the crushing chamber is equipped with a displacement sensor for detecting the lateral displacement of the slide bar, and the magnetic repulsion controller is also configured to control the power motor to reduce the output speed or output reverse power when the displacement sensor detects that the reciprocating stroke of the slide bar is lower than a preset threshold set time.

[0015] Furthermore, a step is provided on the inner wall of the crushing chamber near the moving disc, and the moving disc is slidably connected to the step wall in a sealed manner.

[0016] In summary, the beneficial technical effects of this application are as follows: 1. By setting up magnetic repulsion components and elastic reset components, when the rotating shaft rotates, the fixed blade assembly on the slide bar performs high-frequency, small-amplitude reciprocating motion along the axis of the rotating shaft under the action of magnetic repulsion and elastic reset force. This creates a dynamically changing shearing gap between the fixed blade and the rotating moving blade, which not only enhances the shearing effect on waste plastics, but also actively crushes and cleans up the "fiber clumps" or materials stuck between the blades that may be formed by tough soft plastics. This effectively solves the problem that soft plastics easily wrap around hard plastic blocks and get stuck between adjacent blades during the crushing process, causing motor overload, blade wear, and reduced crushing efficiency. 2. By using the high-frequency micro-motion of the fixed blade assembly along the axis of the rotating shaft, the formation of the plastic circulation layer between adjacent blades after crushing can be significantly reduced, and a kneading effect on the material can be formed, ensuring the smooth flow of material inside the crushing chamber and sufficient and uniform shearing. This makes the load on the power motor more stable, avoids the sudden increase in power motor current caused by material blockage, and is more energy-efficient. 3. By sequentially setting the root, cutting section and shoulder on the cutting edge of the fixed blade, the flow direction of waste plastic can be guided, and the tearing and pulling effect on waste plastic can be improved. This solves the problem of "pushing" and "slipping" that easily occur when a single sharp blade is cutting tough materials. It can effectively prevent plastic sheets or fibers from getting tangled in the gap between the fixed blade and the moving blade, further reducing the probability of blade entanglement and material jamming when the crusher is crushing mixed plastics. 4. With the chip discharge port, chip discharge cover, and serrated blade on the moving blade, the rotating multi-stage chip discharge cover and serrated blade can effectively decompose stuck waste plastic in a circumferential direction, promoting the cleaning effect of stuck waste plastic; the serrated blade can form multiple scraping and tearing of stuck waste plastic in a circumferential and radial direction, further improving the crushing effect on soft plastics and materials wrapped around the blade; the small waste plastics broken by the chip discharge cover can pass through the chip discharge port to the other side of the moving blade, that is, guide the stuck waste plastic to the non-stuck side, which can realize the "instant crushing and discharge" of stuck waste plastic, avoiding the crushed material being squeezed into the stuck waste plastic and causing repeated jamming; 5. By setting a displacement sensor to monitor the reciprocating lateral travel of the slider, and by using a magnetic repulsion controller to make judgments and handle the situation, the output speed of the power motor or the output of reverse power can be controlled to carry out graded handling. This realizes the automated handling of material jamming in the crusher, and the handling process does not require a complex control structure. It only requires changing the magnitude or direction of the current supplied to the electromagnet. It does not need to directly contact the jammed material, nor does it require stopping the machine for handling. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this application embodiment after the side panels are hidden and the crushing chamber is exposed; Figure 2 This is a cross-sectional structural diagram of an embodiment of this application; Figure 3 yes Figure 2 A magnified view of part A in the middle; Figure 4 This is a schematic diagram of the internal structure of the pulverizing chamber in an embodiment of this application; Figure 5 This is a front view of the internal structure of the shredding chamber in an embodiment of this application; Figure 6 This is a schematic diagram of the fixed blade structure according to an embodiment of this application; Figure 7 This is a schematic diagram of the structure of the moving blade in an embodiment of this application; Figure 8 This is a front view of one side of the cutting edge of the moving blade in an embodiment of this application; Figure 9 This is a schematic diagram of the moving disk and permanent magnet in an embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: 11. Base; 12. Crushing chamber; 121. Limiting structure; 122. Step; 13. Feed hopper; 14. Discharge hopper; 15. Power motor; 21. Rotating shaft; 22. Moving disc; 3. Moving blade; 31. Chip discharge port; 32. Chip discharge cover; 33. Serrated blade; 4. Fixed blade; 41. Cutting edge; 411. Root; 412. Cutting section; 413. Shoulder; 5. Sliding bar; 51. Elastic return element; 52. Mounting bracket; 61. Permanent magnet; 62. Electromagnet; 7. Displacement sensor. Detailed Implementation

[0019] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] This application discloses a high-efficiency pulverizer. (Refer to...) Figure 1 , Figure 2 and Figure 3 It includes a crushing chamber 12, a rotating shaft 21, multiple moving blade groups and multiple fixed blade groups. The moving blades 3 in the moving blade groups and the fixed blades 4 in the fixed blade groups are alternately spaced along the axial direction of the rotating shaft 21 to form a shearing zone. It also includes a base 11, a power motor 15, and a feed hopper 13 connected to the upper part of the crushing chamber 12 and a discharge hopper 14 connected to the lower part of the crushing chamber 12. The power motor 15 is used to drive the rotating shaft 21 to rotate. Specifically, the crushing chamber 12 is also equipped with wear-resistant liners, filter screens, inspection ports, and other components, which are all conventional technical means in the field and can be fully implemented by those skilled in the art, and will not be described in detail here.

[0021] Multiple slide bars 5 are slidably arranged on the inner wall of the crushing chamber 12 along the axial direction of the rotating shaft 21. The fixed blade assembly is installed on the slide bars 5. One end of the slide bar 5 is connected to the crushing chamber 12 by an elastic reset member 51, and the other end is connected to the end of the rotating shaft 21 by a magnetic repulsion component. When the rotating shaft 21 rotates, the magnetic repulsion component intermittently generates a thrust on the slide bar 5 along the axial direction of the rotating shaft 21, causing the fixed blade assembly to slide back and forth in a small amplitude along the axial direction of the rotating shaft 21. The elastic reset member 51 is specifically a tension spring, one end of which is fixedly connected to the slide bar 5 and the other end of which is fixedly connected to the crushing chamber 12. It is located in the interlayer between the wear-resistant liner and the crushing chamber 12 and is not exposed in the cavity of the crushing chamber 12. Specifically, no matter where the slide bar 5 slides, the elastic reset member 51 is always in a stretched state.

[0022] The inner wall of the crushing chamber 12 is provided with a limiting structure 121 to ensure that the fixed blade 4 is always located between two adjacent moving blades 3 distributed along the axial direction of the rotating shaft 21. Specifically, a T-shaped anti-detachment guide rail is installed on the inner wall of the crushing chamber 12, and several T-shaped blocks are fixedly connected to the slide bar 5 and slidably disposed in the T-shaped anti-detachment guide rail. The limiting structure 121 is set as anti-detachment blocks fixed to both ends of the T-shaped anti-detachment guide rail. Furthermore, a sound-absorbing pad is fixedly connected to the side of the anti-detachment block near the T-shaped block. The T-shaped anti-detachment guide rail does not protrude from the surface of the wear-resistant liner plate, and a dustproof sheet for shielding the T-shaped anti-detachment guide rail is fixedly connected to the periphery of the end of the slide bar 5 near the wear-resistant liner plate to prevent broken plastic from entering the sliding structure of the slide bar 5 in the crushing chamber 12.

[0023] Therefore, when using the crusher of this application to crush and recycle waste plastics, the waste plastics are first fed into the feed hopper 13 and then enter the crushing chamber. During the rotation of the rotating shaft 21 driven by the power motor 15, multiple moving blade groups on it rotate, causing the moving blades 3 to circulate and shear between adjacent fixed blades 4 in the fixed blade group. At the same time, under the bidirectional action of the magnetic repulsion component and the elastic reset component 51, the fixed blade group on the slide bar 5 performs high-frequency, small-amplitude reciprocating motion along the axial direction of the rotating shaft 21 under the action of magnetic repulsion and elastic reset force. This creates a dynamically changing shearing gap between the fixed blades 4 and the rotating moving blades 3, which not only enhances the shearing effect on waste plastics, but also actively crushes and cleans up "fiber clumps" or materials stuck between the blades that may be formed by tough soft plastics. This effectively solves the problem that soft plastics easily wrap around hard plastic blocks and get stuck between adjacent blades during the crushing process, causing motor overload, blade wear, and reduced crushing efficiency.

[0024] Moreover, by using the high-frequency micro-motion of the fixed blade assembly along the axis of the rotating shaft 21, the formation of the plastic circulation layer between adjacent blades after crushing can be significantly reduced, and a kneading effect on the material can be formed, ensuring the smooth flow of material inside the crushing chamber 12 and sufficient and uniform shearing. This makes the load on the power motor 15 more stable and avoids the sudden increase in current of the power motor 15 caused by material blockage, thereby processing more material in the same amount of time or consuming less power to process the same material.

[0025] Among them, reference Figure 4 , Figure 5 and Figure 6 The fixed blade 4 is provided with a cutting edge 41 on the side facing the rotation direction of the rotating shaft 21. The cutting edge 41 includes a root 411, a cutting part 412 and a shoulder 413 arranged in sequence. Both the root 411 and the shoulder 413 are arc-shaped and their arc directions are opposite. The outer arc side of the root 411 faces the rotation direction of the rotating shaft 21. The cutting part 412 smoothly connects the root 411 and the shoulder 413. The tip of the moving blade 3 extends at least beyond the cutting portion 412, and the cutting portion 412 is serrated.

[0026] Among them, reference Figure 4 , Figure 7 and Figure 8 Multiple moving blades 3 in the moving blade assembly are arranged in a circumferential array with equal spacing around the axis of the rotating shaft 21. The moving blades 3 in two adjacent moving blade assemblies are set with different installation angles, such as staggered by 15°, 30°, 60°, 90°, etc., to reduce the instantaneous load of the rotating shaft 21. Multiple arc-shaped chip removal ports 31 are spaced apart on the moving blades 3. A chip removal cover 32 that partially covers the chip removal port 31 is fixed to the moving blade 3 at the chip removal port 31. The chip removal cover 32 is also arranged in the same arc shape as the chip removal port 31. The chip removal cover 32 opens on one side facing its rotation direction and communicates with the chip removal port 31. The opening end of the chip removal cover 32 is also sharpened. Multiple chip removal covers 32 are arranged on both sides of the moving blade 3.

[0027] Furthermore, the distance between the back of the chip removal cover 32 and the moving blade 3 gradually decreases along the rotation direction of the moving blade 3, and a serrated blade 33 extending to the front of its opening is fixedly connected to the back of the chip removal cover 32; the curvature of the serrated blade 33 relative to the axis of the rotating shaft 21 gradually increases along the rotation direction of the moving blade 3.

[0028] Therefore, when the waste plastic in the crushing chamber flows with the rotation of the moving blade assembly on the rotating shaft 21, the outer arc side of the root 411 of the cutting edge 41 of the fixed blade 4 faces the direction of waste plastic flow, which can actively guide the waste plastic into the core shearing zone near the rotating shaft 21; the reverse arc setting at the shoulder 413 of the cutting edge 41 can form a buffer after shearing and guide the uncut waste plastic to slide to the serrated cutting part 412. The serrated cutting part 412 is equivalent to decomposing a large area of ​​shearing surface into countless tiny local stress concentration points, which can significantly improve the tearing and pulling effect on waste plastic, especially beneficial for crushing fiber-reinforced plastics or film-type soft plastics. It solves the "pushing" and "slipping" phenomena that easily occur when a single sharp cutting edge 41 cuts tough materials, and can effectively prevent plastic sheets or fibers from getting tangled in the interlacing gap between the fixed blade 4 and the moving blade 3, further reducing the probability of blade entanglement and material jamming when the crusher crushes mixed plastics.

[0029] Furthermore, through the arrangement of the chip discharge port 31, chip discharge cover 32, and serrated blade 33 on the moving blade 3, on the one hand, the chip discharge cover 32 and serrated blade 33 distributed on both sides of the moving blade 3 can perform multi-level radial dismantling of the waste plastic stuck between two adjacent fixed blades 4. In particular, when the moving blade assembly performs high-frequency micro-movements along the axial direction of the rotating shaft 21, the stuck waste plastic frequently presses against the chip discharge cover 32 and serrated blade 33 on the moving blade 3 from the side. The rotating multi-stage chip discharge cover 32 and serrated blade 33 can effectively decompose the stuck waste plastic in a circumferential direction, thereby promoting the cleaning effect of the stuck waste plastic. On the other hand, since the curvature of the serrated blade 33 relative to the axis of the rotating shaft 21 gradually increases along the rotation direction of the moving blade 3, the serrated blade 33 can form multiple circumferential and radial scraping and tearing of the stuck waste plastic when the moving blade 3 rotates, further improving the crushing effect on soft plastics and materials wrapped around the blade. On the other hand, the small waste plastics broken by the chip discharge hood 32 can pass through the chip discharge port 31 to the other side of the moving blade 3, that is, guide the stuck waste plastics to the unstuck side, which can realize the "instant breaking and discharge" of stuck waste plastics, avoid the crushed material being squeezed in the stuck waste plastics and causing repeated jamming, and can further improve the unblocking effect.

[0030] In addition, refer to Figure 2 , Figure 4 and Figure 9 The magnetic repulsion component includes: The moving disc 22 is coaxially fixed to the end of the rotating shaft 21; specifically, a step 122 is provided on the inner wall of the crushing chamber 12 near the moving disc 22, and the moving disc 22 is slidably connected to the wall of the step 122.

[0031] The permanent magnets 61 are arranged in a fan shape and are distributed in an equally spaced circular array around the axis of the rotating shaft 21 on the side of the moving disk 22 away from the rotating shaft 21.

[0032] An electromagnet 62 is installed at the end of the slide bar 5 and is spaced apart from the permanent magnet 61 on the moving plate 22. The electromagnet 62 is located on the side of the moving plate 22 away from the rotating shaft 21. When the electromagnet 62 is energized, it repels the permanent magnet 61 magnetically. Specifically, a mounting bracket 52 is fixed to the end of the slide bar 5, which crosses the step 122 and extends to the outside of the moving plate 22. The electromagnet 62 is installed at the end of the mounting bracket 52 away from the slide bar 5.

[0033] The magnetic repulsion controller is configured to control the on and off of the electromagnet 62 via pulses. Specifically, the frequency of the pulses controlling the on and off of the electromagnet 62 is positively correlated with the output speed of the power motor 15. That is, the higher the speed of the rotating shaft 21, the higher the frequency at which the slide bar 5 drives the fixed tool group to reciprocate laterally.

[0034] Furthermore, refer to Figure 2 and Figure 3The crushing chamber 12 is equipped with a displacement sensor 7 for detecting the lateral displacement of the slide bar 5. The magnetic repulsion controller is also configured to: when the displacement sensor 7 detects that the reciprocating stroke of the slide bar 5 is lower than a preset threshold for a set time, control the power motor 15 to reduce its output speed or output reverse power. Specifically, when the magnetic repulsion controller determines that the system is about to jam, it first controls the power motor 15 to reduce its output speed for 3 to 5 seconds. If the reciprocating stroke of the slide bar 5 detected by the displacement sensor 7 is still lower than the preset threshold, then it controls the power motor 15 to output low-speed reverse power so that the rotating shaft 21 drives the moving blade assembly to rotate in the opposite direction.

[0035] This design takes into account the following factors: when the stroke of slider 5 decreases, it means that the movement of slider 5 in any or both directions driven by the magnetic repulsion component and the elastic reset component 51 is obstructed, which is a precursor to material jamming between the blades. This application uses displacement sensor 7 to monitor the reciprocating stroke of slider 5 in real time. When material accumulates between adjacent blades, causing the reciprocating stroke of slider 5 driving the fixed blade group to move laterally to a level below a preset threshold, it is detected by displacement sensor 7. If the accumulated material is cleared as the rotating shaft 21 continues to rotate, the displacement value detected by displacement sensor 7 will return to the preset threshold.

[0036] If, as the shaft 21 continues to rotate, the value detected by the displacement sensor 7 remains below the preset threshold for a set time, it indicates that the accumulated material cannot be effectively cleared. At this point, the magnetic repulsion controller determines that the system is about to jam and controls the power motor 15 to reduce its output speed or reverse its output power. The control prioritizes reducing the speed before reversing the output, ensuring effective clearing of the jammed material without significantly impacting the overall efficiency of the crusher in processing waste plastics. This invention achieves automatic monitoring and handling of material jamming during the crushing process of waste plastics, without requiring a complex control structure. It only requires changing the magnitude or direction of the current supplied to the electromagnet 62, without direct contact with the jammed material or requiring machine shutdown. The system boasts a higher degree of automation and processing efficiency.

[0037] Moreover, once the power motor 15 is controlled to output reverse power, when the rotating shaft 21 drives the moving blade 3 to rotate in the opposite direction, the serrated edge 33 on the back of the chip discharge cover 32 on the moving blade 3 gradually expands along the reverse direction, which can effectively break and separate the accumulated material, so that the reciprocating lateral stroke of the fixed blade group on the slide bar 5 can be restored to the preset threshold state as soon as possible to eliminate jamming.

[0038] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-efficiency pulverizer, comprising a pulverizing chamber, a rotating shaft, multiple moving blade groups, and multiple fixed blade groups, wherein the moving blades in the moving blade groups and the fixed blades in the fixed blade groups are alternately spaced along the axial direction of the rotating shaft to form a shearing zone, characterized in that, Multiple slide bars are slidably arranged on the inner wall of the crushing chamber along the axis of rotation. The fixed blade assembly is installed on the slide bars. One end of the slide bar is connected to the crushing chamber with an elastic reset component, and the other end is provided with a magnetic repulsion component between it and the end of the rotating shaft. When the rotating shaft rotates, the magnetic repulsion component intermittently generates a thrust along the axis of rotation on the slide bar, causing the fixed blade assembly to slide back and forth in a small amplitude along the axis of rotation. The inner wall of the crushing chamber is provided with a limiting structure to ensure that the fixed blade is always located between two adjacent moving blades distributed along the axis of rotation.

2. The high-efficiency pulverizer according to claim 1, characterized in that, The fixed blade has a cutting edge on the side facing the rotation direction of the rotating shaft, and the cutting edge includes a root, a cutting part and a shoulder arranged in sequence. Both the root and the shoulder are arc-shaped and their arc directions are opposite. The outer arc side of the root faces the direction of rotation of the shaft, and the cutting part smoothly connects the root and the shoulder. The tip of the moving blade extends at least beyond the cutting section.

3. The high-efficiency pulverizer according to claim 2, characterized in that, The cutting section is configured as a serrated edge.

4. The high-efficiency pulverizer according to claim 1, characterized in that, The moving blade is provided with a plurality of arc-shaped chip discharge ports spaced apart. A chip discharge cover is fixed to the moving blade at the chip discharge port to partially cover the chip discharge port. The chip discharge cover opens on one side in the direction of rotation and communicates with the chip discharge port. The gap between the back of the chip conveyor and the moving blade gradually decreases along the rotation direction of the moving blade, and a serrated blade extending to the front of its opening is fixed to the back of the chip conveyor. Multiple chip removal covers are arranged on both sides of the moving blade.

5. A high-efficiency pulverizer according to claim 4, characterized in that, The curvature of the serrated edge relative to the axis of rotation gradually increases along the rotation direction of the moving blade.

6. A high-efficiency pulverizer according to claim 1, characterized in that, The moving blades in the moving blade group are arranged in a circumferential array with equal spacing around the axis of rotation, and the moving blades in two adjacent moving blade groups are set with different mounting angles.

7. A high-efficiency pulverizer according to any one of claims 1-6, characterized in that, The magnetic repulsion component includes: The moving disc is coaxially fixed to the end of the rotating shaft; The permanent magnets are arranged in a fan shape and are distributed in an equally spaced circular array on the side of the moving disk away from the axis of rotation. An electromagnet, mounted at the end of the slider and spaced apart from the permanent magnet on the moving plate, repels the permanent magnet when energized; and The magnetic repulsion controller is configured to control the on / off state of the electromagnet via pulses.

8. A high-efficiency pulverizer according to claim 7, characterized in that, A power motor for driving the rotating shaft is installed outside the crushing chamber, and the magnetic repulsion controller is also configured to control the pulse frequency of the electromagnet to be positively correlated with the output speed of the power motor.

9. A high-efficiency pulverizer according to claim 8, characterized in that, The crushing chamber is equipped with a displacement sensor for detecting the lateral displacement of the slide bar. The magnetic repulsion controller is also configured to control the power motor to reduce the output speed or output reverse power when the displacement sensor detects that the reciprocating stroke of the slide bar is lower than a preset threshold set time.

10. A high-efficiency pulverizer according to claim 7, characterized in that, The inner wall of the crushing chamber near the moving disc is provided with a step, and the moving disc is slidably connected to the wall of the step in a sealed manner.

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