Crushing device and crushing method

Abstract

The invention relates to the technical field of material crushing, and provides a crushing device and a crushing method. The smashing device comprises a box body, a first rotating part, a second rotating part and a feeding hopper. A crushing cavity is formed in the box body, and a discharge hole communicated with the crushing cavity is formed in the edge of the box body; the first rotating part comprises a first impeller arranged in the crushing cavity, a plurality of first blades are arranged on the face, away from the first inner wall of the crushing cavity, of the first impeller, and the first blades are used for generating first recompression shock wave pulses in the rotating process; the second rotating part comprises a second impeller arranged in the crushing cavity, a plurality of second blades are arranged on the face, facing the first impeller, of the second impeller, and the second blades are used for generating second recompression shock wave pulses in the rotating process; the feeding hopper is arranged on the box body. The problems that in the prior art, the length-diameter ratio and the specific surface area of particles produced by a smashing device are low, and the reactivity of lignocellulose is reduced are solved, wood particles can be smashed, and the reactivity of the lignocellulose can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material crushing, and in particular to a crushing device and a crushing method. Background Art

[0002] Wood material crushing is not only widely used in traditional processing fields such as biomass fuel, wood-based panels, wood-plastic composites and paper, but also has important applications in high-value-added biochemical processing such as saccharification, liquefaction and gasification of lignocellulosic biomass.

[0003] Most existing crushing devices and crushing methods rely on direct contact between crushing tools and wood raw materials or free collision of crushed particles to form shear stress to destroy the raw material structure.

[0004] However, the particles produced by existing pulverization devices and pulverization methods have low aspect ratio and specific surface area, which reduces the reactivity of lignocellulose. Summary of the Invention

[0005] The present invention provides a pulverizing device and a pulverizing method, which are used to solve the defects of the pulverizing device and pulverizing method in the prior art in that the particles produced have a low aspect ratio and specific surface area, and the reactivity of the lignocellulose is reduced. The invention can not only pulverize the wood particles but also improve the reactivity of the lignocellulose.

[0006] The present invention provides a pulverizing device, comprising: The box body has a crushing chamber inside and a discharge port connected to the crushing chamber at its edge; a first rotating component, comprising a first impeller disposed inside the pulverizing chamber, wherein a surface of the first impeller facing away from the first inner wall of the pulverizing chamber is provided with a plurality of first blades, wherein the first blades are used to generate a first recompression shock wave pulse during rotation; a second rotating component, comprising a second impeller disposed inside the pulverizing chamber, the second impeller being spaced apart from the first impeller, a second impeller having a plurality of second blades on a side facing the first impeller, the second blades being configured to generate a second recompression shock wave pulse during rotation; A feed hopper is provided in the box body, and is used to put materials into a predetermined position so that the materials move to a discharge port after being acted upon by the first recompression shock wave pulse and the second recompression shock wave pulse.

[0007] According to a pulverizing device provided by the present invention, the rotation center axes of the first impeller and the second impeller are both located on a first straight line, and the first impeller and the second impeller rotate in opposite directions; The plurality of first blades are arranged in a circular pattern with the first straight line as the center to form a first circular blade group; The plurality of second blades are arranged in a circular pattern with the first straight line as the center to form a second circular blade group; The first circular leaf groups and the second circular leaf groups are alternately arranged to form a crushing ring belt, and the outlet of the feed hopper is located in the center of the crushing ring belt.

[0008] According to a pulverizing device provided by the present invention, the second impeller includes: A central disk is located in the center of the pulverizing chamber, and a relief space is provided between the central disk and the second inner wall of the pulverizing chamber, wherein the relief space is used to accommodate the outlet of the feed hopper; An edge disk is connected to the central disk through the second circular blade group. The edge disk is located at the edge of the pulverizing chamber, and a pulverizing space is provided between the edge disk and the first impeller.

[0009] According to a pulverizing device provided by the present invention, a brush ring is provided on the side of the second inner wall facing the edge disk, and the brush ring is in contact with the edge disk; The brush ring is used to prevent air from circulating between the second inner wall and the edge disk.

[0010] According to a pulverizing device provided by the present invention, the surface profiles of the first blade and the second blade are both subcritical profiles; One of the first blades and the second blades is arranged in a clockwise direction, and the other is arranged in a counterclockwise direction.

[0011] According to a crushing device provided by the present invention, the box body includes: A box body, one side of which is provided with an opening, wherein the first inner wall is located on the box body; a cover body, detachably disposed on the opening, wherein the second inner wall is located on the cover body; The box body (110) cooperates with the cover body to form the crushing chamber.

[0012] According to a pulverizing device provided by the present invention, the first rotating component further includes: a first transmission shaft, passing through the first inner wall and being rotatably connected to the first inner wall, one end of the first transmission shaft being connected to the first impeller; The first motor is provided at the other end of the first transmission shaft, and is used to drive the first transmission shaft to rotate.

[0013] According to the pulverizing device provided by the present invention, a first sealed bearing is provided between the first transmission shaft and the first inner wall.

[0014] According to a pulverizing device provided by the present invention, the second rotating component further includes: a second transmission shaft, passing through the second inner wall and being rotatably connected to the second inner wall, one end of the second transmission shaft being connected to the center disk; The second motor is provided at the other end of the second transmission shaft, and is used for driving the second transmission shaft to rotate.

[0015] The present invention further provides a pulverizing method, which is implemented based on the pulverizing device described in any one of the above embodiments, comprising: The material is crushed by the first blade generating a first recompression shock wave pulse during the rotation process and the second blade generating a second recompression shock wave pulse during the rotation process.

[0016] The comminution device provided by the present invention accelerates the first and second blades to transonic speeds. The recompression shock pulses generated during their movement act rapidly and continuously on the wood particles at supersonic speeds, destroying the cell wall structure of the wood particles and further comminuting the particles. Simultaneously, the recompression shock pulses are transmitted into the interior of the wood particles, loosening the wood fibers and microfibrils, thereby increasing the reactivity of the lignocellulose. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a cross-sectional view of the crushing device provided by the present invention.

[0019] Figure 2 It is a schematic diagram of the arrangement and relative movement of the first blade and the second blade of the crushing device provided by the present invention.

[0020] Figure 3 It is a schematic diagram of the relative movement of the first blade and the second blade of the pulverizing device provided by the present invention and their interaction with the pulverized particles.

[0021] Figure 4 It is a schematic diagram of the outlines of the first blade and the second blade of the crushing device provided by the present invention and the flow state of the transonic fluid.

[0022] Figure 5 It is a transonic flow schematic diagram of the first blade and the second blade of the crushing device provided by the present invention.

[0023] Reference numerals: 100: box body; 110: box body; 120: cover; 130: crushing chamber; 140: discharge port; 200: first rotating component; 210: first motor; 220: first transmission shaft; 230: first sealed bearing; 240: first impeller; 250: first blade; 251: leading edge; 252: tail; 300: second rotating component; 310: second motor; 320: second transmission shaft; 330: second sealed bearing; 340: second impeller; 341: center disk; 342: edge disk; 350: second blade; 360: avoidance space; 370: brush ring; 380: crushing space; 400: feed hopper; 410: material; 510: Recompression shock wave; 520: Sound velocity line; 530: Vortex; 540: Laminar flow; 550: Fluid boundary zone; 560: Material motion trajectory; 570: Isolated sound velocity point. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0025] The following combination Figure 1-Figure 5 The structure and working principle of the present invention are described. It should be noted that the material 410 in the present invention can be wood particles.

[0026] Reference Figure 1The present invention provides a crushing device including a box body 100 , a first rotating component 200 , a second rotating component 300 and a feed hopper 400 . Among them, the interior of the box body 100 is provided with a crushing chamber 130, and the edge is provided with a discharge port 140 connected to the crushing chamber 130; the first rotating component 200 includes a first impeller 240 arranged inside the crushing chamber 130, and a plurality of first blades 250 are fixed on the side of the first impeller 240 facing away from the first inner wall of the crushing chamber 130, and the first blades 250 are used to generate a first recompression shock wave pulse during the rotation process; the second rotating component 300 includes a second impeller 340 arranged inside the crushing chamber 130, the second impeller 340 is spaced apart from the first impeller 240, and a plurality of second blades 350 are fixed on the side of the second impeller 340 facing the first impeller 240, and the second blades 350 are used to generate a second recompression shock wave pulse during the rotation process; the feed hopper 400 is provided in the box body 100, and the feed hopper 400 is used to put the material 410 into a predetermined position, so that the material 410 moves to the discharge port 140 after being acted upon by the first recompression shock wave pulse and the second recompression shock pulse. It should be noted that, for the convenience of description, the “blade” that appears separately in the following implementation may specifically refer to the first blade 250 and the second blade 350 .

[0027] Specifically, the shape of the box body 100 is roughly as follows Figure 1 The crushing chamber 130 is flat as shown, and is set vertically. In order to ensure the normal operation of the first recompression shock wave pulse and the second recompression shock wave pulse, the box body 100 is sealed at all connections or openings except the discharge port 140. Secondly, in order to facilitate its better operation, a support frame (not shown in the figure) can be set on the box body 100 to fix it. The crushing chamber 130 can be circular or rectangular, as long as the second impeller 340 and the first impeller 240 can rotate inside it. The shape of the second impeller 340 and the first impeller 240 can be disc-shaped, and both rotate in a vertical plane.

[0028] In the above structure, the first and second recompression shock pulses form counter-current airflows, subjecting the material 410 to high-frequency impact and shearing, achieving efficient crushing. Simultaneously, the two airflows jointly propel the material 410 toward the discharge port 140, preventing accumulation of the material 410 within the crushing chamber 130. The spacing between the first and second impellers 240, 340 provides ample crushing space for the material 410, and the particle size can be controlled by adjusting the rotational speed. The discharge port 140 is located at the edge of the housing 100, facilitating the centrifugal discharge of the crushed material 410.

[0029] In practice, the present invention accelerates the first and second blades 250 and 350 to transonic speeds. The resulting recompression shock pulses act rapidly and continuously on the wood particles at supersonic speeds, disrupting the cell wall structure and further pulverizing the particles. Simultaneously, the recompression shock pulses penetrate deep into the wood particles, loosening the wood fibers and microfibrils, thereby increasing the reactivity of the lignocellulose.

[0030] Reference Figure 2 and Figure 3 In some embodiments of the present invention, the rotation center axes of the first impeller 240 and the second impeller 340 are both located on the first straight line, and the rotation directions of the first impeller 240 and the second impeller 340 are opposite; a plurality of first blades 250 are arranged in a circular pattern with the first straight line as the center to form a first circular blade group; a plurality of second blades 350 are arranged in a circular pattern with the first straight line as the center to form a second circular blade group; the first circular blade group and the second circular blade group are alternately arranged to form a crushing ring belt, and the outlet of the feed hopper 400 is located in the center of the crushing ring belt.

[0031] Specifically, the first straight line can be a line that passes horizontally through the center of the box body 100. That is, the first impeller 240 and the second impeller 340 rotate in the vertical direction around the horizontal line. Figure 2 That is, the plurality of first blades 250 are arranged in a circle in sequence, and one of the first blades 250 and the second blades 350 is arranged in a clockwise direction, and the other is arranged in a counterclockwise direction.

[0032] It should be noted that more than one of each of the first and second circular leaf groups can be provided. When at least one of the first and second circular leaf groups exceeds two, they need to be arranged in an odd-numbered and even-numbered pattern. For example, when there are two of each of the first and second circular leaf groups, the first and third circles constitute the second circular leaf group, while the second and fourth circles constitute the first circular leaf group. Of course, the first and third circles can also constitute the first circular leaf group, while the second and fourth circles constitute the second circular leaf group, and so on.

[0033] In this embodiment, by mounting the first blades 250 and the second blades 350 on two sets of coaxial impellers 240 and second impellers 340 that rotate in opposite directions, the relative speed of the fluid and the wood particles contained therein and the impellers can be reduced due to the pulling effect caused by the viscosity of the air fluid when a single set of blades rotates. On the other hand, when the two sets of impellers rotate in opposite directions, a fluid boundary zone 550 with a speed of zero is formed between the internal gaps of the impellers (e.g., Figure 3As shown in FIG5 ), the fluid boundary zone 550 is conducive to the suspension of the material 410 in the impeller. When the material 410 is located between the two blades, it will be briefly suspended due to the influence of the boundary zone 550 and will be subjected to two pulse shocks of recompression shock waves in opposite directions. This will increase the number of times the particles are affected by pressure pulses.

[0034] Furthermore, in this embodiment, when the rotational speed of the two sets of blades is 12,000 rpm, with a diameter of 450 mm, the linear velocity of the blades increases from near the axis to the periphery, and the linear velocity is approximately 157 m / s-283 m / s, which is approximately 46%-83% of the speed of sound. Considering the relative motion of the two sets of blades, the impact frequency of the recompression shock wave 510 is approximately 4 kHz. When the material 410 is fed from the feed hopper, it will first reach the central area of the pulverizing annulus. Ultimately, under the action of gravity, centrifugal force, and pulse pressure, it will move along the material motion trajectory 560 in the pulverizing annulus, and experience the high-frequency impact of the recompression shock wave 510, and finally be discharged from the discharge port 140.

[0035] Reference Figure 4 In some possible embodiments, the surface profiles of the first blade 250 and the second blade 350 are both subcritical profiles. Specifically, the leading edge 251 of the blade is elliptical, and the outflow end of the tail 252 is an acute angle. When flowing through the tail of the blade, a vortex 530 is generated due to the separation of the air viscosity laminar flow 540. With this arrangement, on the one hand, wood particles will collide with the blades less frequently, especially smaller wood particles will move along the surface of the blades. Therefore, the blade surface does not require special armor protection, and the influence of wear on the crushing performance of the equipment is avoided. On the other hand, the blade surface is designed with a subcritical profile, which can keep the fluid on the blade surface in a laminar state as much as possible, thereby helping to reduce operating resistance and reduce energy consumption.

[0036] It's important to note that in subsonic flow, a suction peak can form on the blade surface, causing the local pressure coefficient to become negative, potentially leading to supersonic flow. The likelihood of supersonic flow increases with the incoming Mach number and the absolute value of the negative local pressure coefficient. Specifically, if the relative velocity of the air and the wood particles suspended in the air approach the speed of sound, the relative velocity of the surrounding fluid can reach supersonic speeds. This type of flow, characterized by a localized supersonic region around the blade, is called transonic flow.

[0037] Depending on the aerodynamic shape of the blade, the critical Mach number formed by transonic flow is different. The critical Mach number range of its transonic flow is generally greater than 0.55 and less than 1. The local supersonic region formed is surrounded by the sound speed line and the recompression shock wave. The supersonic region is limited by the contours of the leading edge and tail of the blade and the streamlined objects. At the tail of the blade, the airflow will transition from supersonic speed to conventional speed. Because supersonic flow cannot return to a higher pressure in a smooth manner, the fluid will suddenly decelerate and increase the pressure through the recompression shock wave. In the process, the air pressure will rapidly rise to several times the normal pressure and return to normal pressure after a brief low-pressure phase.

[0038] Reference Figure 5 When the blade speed increases to the critical Mach number, an isolated sonic point 570 appears at the lowest pressure point on the upper and lower surfaces behind the leading edge 251 of the blade. The air velocity at this point is exactly Mach 1. When the blade speed exceeds the critical Mach number, a fluid motion region with a Mach number greater than 1 forms behind the isolated sonic point 570. This region is labeled first region S1 and is bounded by the sonic line 520 and the recompression shock wave 510. The Mach number of second region S2 is less than 1. The pressure of the recompression shock wave 510 is several times that of normal atmospheric pressure, and its initial location is at the tail end 252 of the blade.

[0039] Reference Figure 1 In some embodiments of the present invention, the second impeller 340 includes a center disk 341 and an edge disk 342. The center disk 341 is located in the center of the crushing chamber 130, and a clearance space 360 is defined between the center disk 341 and the second inner wall of the crushing chamber 130. The clearance space 360 is used to accommodate the outlet of the feed hopper 400. The edge disk 342 is connected to the center disk 341 via a second circular blade assembly. The edge disk 342 is located at the edge of the crushing chamber 130, and a crushing space 380 is defined between the edge disk 342 and the first impeller 240.

[0040] Specifically, the center disk 341 is disc-shaped, while the edge disk 342 is annular. The center disk 341 is positioned near the first impeller 240, thereby allowing for a larger space, or escape space 360, between the center disk 341 and the second inner wall of the pulverizing chamber 130. This allows the outlet of the feed hopper 400 to extend into the escape space 360. This arrangement prevents the second impeller 340 from being affected by the feed hopper 400 during rotation, while also allowing material to be directly delivered to the center of the pulverizing belt. Positioning the edge disk 342 near the second inner wall allows for a larger space between the edge disk 342 and the first impeller 240, thereby accommodating the first and second blades 250, 350.

[0041] Reference Figure 1In some embodiments of the present invention, a brush ring 370 is provided on the side of the second inner wall facing the edge disk 342, and the brush ring 370 is in contact with the edge disk 342; the brush ring 370 is used to prevent air from flowing between the second inner wall and the edge disk 342.

[0042] When the side of the edge disc 342 facing the second inner wall rotates at high speed, the viscosity of the air fluid and the centrifugal force can cause the air between the second inner wall and the edge disc 342 to flow outward, thereby generating unnecessary suction. This can cause the material 410 entering from the feed hopper 400 to be sucked into the gap between the second inner wall and the edge disc 342 without passing through the pulverizing belt and then flow out through the discharge port 140. To address this problem, this embodiment provides a brush ring 370 on the side of the second inner wall facing the edge disc 342, thereby obstructing air flow in the gap and reducing the suction on the material 410.

[0043] It should be noted that the brush ring 370 is made of a flexible, wear-resistant material, and the density and length of its bristles are configured according to the airflow blocking requirements. The contact pressure between the brush ring 370 and the edge disk 342 can ensure that an effective seal is maintained even in the rotating state. This arrangement prevents the material 410 from being directly sucked into the gap between the second inner wall and the edge disk 342 without being processed by the crushing ring belt, and ensures that all materials must be fully crushed by passing through the crushing ring belt formed by the first circular leaf group and the second circular leaf group. In some possible embodiments, in order to increase the suction force to prevent air flow in the gap, multiple brush rings 370 can be set. The parallel arrangement of multiple brush rings 370 can further improve the blocking effect and form a multi-stage sealing structure. The material selection of the brush ring 370 needs to take into account wear resistance and temperature resistance to meet the long-term use requirements under high-speed rotation conditions.

[0044] Reference Figure 1 In some embodiments of the present invention, the box body 100 includes a box body 110 and a cover 120. The box body 110 has an opening on one side, with a first inner wall located on the box body 110; the cover 120 is removably mounted on the opening, with a second inner wall located on the cover 120; the box body 110 and the cover 120 cooperate to form a crushing chamber 130. Specifically, a sealing gasket is provided at the joint surface between the box body 110 and the cover 120 to ensure the sealing of the crushing chamber 130. The cover 120 is fixedly connected to the box body 110 via bolts evenly distributed along its edges. This connection method facilitates maintenance of the equipment and inspection of internal components.

[0045] Reference Figure 1In some embodiments of the present invention, the first rotating component 200 further includes a first transmission shaft 220 and a first motor 210. The first transmission shaft 220 extends through the first inner wall and is rotatably connected thereto. One end of the first transmission shaft 220 is connected to the first impeller 240. The first motor 210 is disposed at the other end of the first transmission shaft 220 and is configured to drive the first transmission shaft 220 to rotate. A first sealed bearing 230 is disposed between the first transmission shaft 220 and the first inner wall.

[0046] In the above structure, the provision of the first sealed bearing 230 ensures smooth rotation of the first transmission shaft 220 while preventing material leakage through the gap between the first inner wall and the first transmission shaft 220. The direct connection between the first motor 210 and the first transmission shaft 220 improves power transmission efficiency and ensures a stable rotational speed for the first impeller 240. This structural design enables the first impeller 240 to generate a stable airflow field within the pulverizing chamber 130, providing the necessary power conditions for material pulverization. The through-type design of the first transmission shaft 220 facilitates assembly and maintenance of the equipment while ensuring the structural strength of the transmission system.

[0047] Reference Figure 1 In some embodiments of the present invention, the second rotating component 300 further includes a second transmission shaft 320 and a second motor 310. The second transmission shaft 320 extends through the second inner wall and is rotatably connected thereto. One end of the second transmission shaft 320 is connected to the center disk 341. The second motor 310 is disposed at the other end of the second transmission shaft 320 and is configured to drive the second transmission shaft 320 to rotate. A second sealed bearing 330 is disposed between the second transmission shaft 320 and the second inner wall.

[0048] In the above structure, the provision of the second sealed bearing 330 ensures the rotational flexibility of the second transmission shaft 320 while effectively preventing material leakage through the gap between the second inner wall and the second transmission shaft 320. The direct drive between the second motor 310 and the second transmission shaft 320 improves energy conversion efficiency and ensures precise speed control of the second rotating disk 340. This structural design enables the second rotating disk 340 to work in conjunction with the first rotating disk 240, forming a stable counter-flow airflow field within the pulverizing chamber 130. The through-hole arrangement of the second transmission shaft 320 facilitates equipment installation, commissioning, and subsequent maintenance, while also enhancing the structural reliability of the transmission system.

[0049] The present invention also provides a crushing method, which is implemented based on the crushing device of any one of the above embodiments, and includes: crushing the material by generating a first recompression shock wave pulse during the rotation of the first blade 250 and a second recompression shock wave pulse during the rotation of the second blade 350.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A crushing device, characterized in that: include: A box body (100) having a crushing chamber (130) therein and a discharge port (140) communicating with the crushing chamber (130) provided on an edge thereof; A first rotating component (200) comprises a first impeller (240) disposed inside the pulverizing chamber (130), wherein a surface of the first impeller (240) facing away from a first inner wall of the pulverizing chamber (130) is provided with a plurality of first blades (250), and the first blades (250) are used to generate a first recompression shock wave pulse during rotation; A second rotating component (300) comprises a second impeller (340) disposed inside the pulverizing chamber (130), the second impeller (340) being spaced apart from the first impeller (240), a surface of the second impeller (340) facing the first impeller (240) being provided with a plurality of second blades (350), the second blades (350) being used to generate a second recompression shock wave pulse during rotation; A feed hopper (400) is provided on the box body (100), and the feed hopper (400) is used to put the material (410) into a predetermined position, so that the material (410) moves to the discharge port (140) after being acted upon by the first recompression shock wave pulse and the second recompression shock wave pulse.

2. The pulverizing device according to claim 1, characterized in that The rotational center axes of the first impeller (240) and the second impeller (340) are both located on a first straight line, and the first impeller (240) and the second impeller (340) rotate in opposite directions; A plurality of the first blades (250) are arranged in a circular pattern with the first straight line as the center to form a first circular blade group; A plurality of the second blades (350) are arranged in a circular pattern with the first straight line as the center to form a second circular blade group; The first circular leaf group and the second circular leaf group are alternately arranged at intervals to form a crushing ring belt, and the outlet of the feed hopper (400) is located in the center of the crushing ring belt.

3. The pulverizing device according to claim 2, characterized in that The second impeller (340) comprises: A central disk (341) is located at the center of the pulverizing chamber (130), and a relief space (360) is provided between the central disk (341) and the second inner wall of the pulverizing chamber (130), wherein the relief space (360) is used to accommodate the outlet of the feed hopper (400); An edge disk (342) is connected to the center disk (341) via the second circular blade assembly, the edge disk (342) is located at the edge of the pulverizing chamber (130), and a pulverizing space (380) is provided between the edge disk (342) and the first impeller (240).

4. The pulverizing device according to claim 3, characterized in that A brush ring (370) is provided on the side of the second inner wall facing the edge disk (342), and the brush ring (370) is in contact with the edge disk (342); The brush ring (370) is used to prevent air from circulating between the second inner wall and the edge disk (342).

5. The pulverizing device according to any one of claims 1 to 4, characterized in that: The surface profiles of the first blade (250) and the second blade (350) are both subcritical profiles; One of the first blades (250) and the second blades (350) is arranged in a clockwise direction, and the other is arranged in a counterclockwise direction.

6. The pulverizing device according to claim 4, characterized in that The box (100) includes: A box body (110) is provided with an opening on one side, and the first inner wall is located on the box body (110); A cover body (120) is detachably provided on the opening, and the second inner wall is located on the cover body (120); The box body (110) and the cover body (120) cooperate to form the crushing chamber (130).

7. The pulverizing device according to claim 2, characterized in that The first rotating component (200) further comprises: a first transmission shaft (220) passing through the first inner wall and being rotatably connected to the first inner wall, one end of the first transmission shaft (220) being connected to the first impeller (240); The first motor (210) is provided at the other end of the first transmission shaft (220), and the first motor (210) is used to drive the first transmission shaft (220) to rotate.

8. The pulverizing device according to claim 7, characterized in that: A first sealed bearing (230) is provided between the first transmission shaft (220) and the first inner wall.

9. The pulverizing device according to claim 3, characterized in that The second rotating component (300) further comprises: a second transmission shaft (320) passing through the second inner wall and being rotatably connected to the second inner wall, one end of the second transmission shaft (320) being connected to the central disk (341); The second motor (310) is provided at the other end of the second transmission shaft (320), and the second motor (310) is used to drive the second transmission shaft (320) to rotate.

10. A comminution method, characterized in that: The pulverizing device according to any one of claims 1 to 9 is implemented, comprising: The first blade (250) generates a first recompression shock wave pulse during rotation, and the second blade (350) generates a second recompression shock wave pulse during rotation to crush the material.

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