Annular magnetic crushing system for micro-nano crushing of wood fibers

Abstract

The present invention discloses an annular magnetic pulverization system for micro-nano crushing of wood fibers, comprising an annular pulverization cavity, a breathing device, and an emission and recovery device. The annular pulverization cavity is a closed structure, and is filled with conductive particles. A circle of electromagnetic drive devices and a circle of gravitational devices are arranged inside the annular pulverization cavity, wherein the electromagnetic drive device is located in the outer circle, and the gravitational device is located in the inner circle. The gravitational device and the electromagnetic drive device exist together. A conductive particle emission and recovery device is connected to the outside of the annular pulverization cavity. Breathing ports are provided at the top and bottom of the annular pulverization cavity, which are connected to the breathing device. Wood fiber powder moves up and down under the regularity of the breathing device, collides with the high-speed moving conductive particles in the annular cavity, and is punctured and crushed. The present invention overcomes the problems of limited diameter of existing professional supporting equipment, the inability of conductive particles to obtain initial velocity, and the problem of insufficient processing efficiency due to the lack of a breathing device.

Description

Technical Field

[0001] The invention belongs to the field of wood fiber processing devices, and in particular relates to an annular magnetic crushing system for micro-nano crushing of wood fibers. Background Art

[0002] Wood fiber primarily comes from wood, agricultural waste (such as straw and corn stalks), and some natural plant materials. Cellulose, hemicellulose, and lignin in these materials are the primary components of wood fiber. Wood fiber is not only a renewable biomass resource but also biodegradable, making it crucial for resource recycling and environmental protection. Functionalizing wood fiber through chemical, physical, or biological methods can impart specific properties, such as enhanced mechanical strength, improved water resistance, electrical conductivity, or antibacterial properties. Functionalized wood fiber can be widely used in packaging, building materials, biodegradable plastics, textiles, filtration materials, and other fields, contributing to the development of new, environmentally friendly materials.

[0003] Micronization of wood fibers involves processing them into micron- or nanometer-scale fibers, thereby increasing their specific surface area and enhancing their mechanical properties. Micronized wood fibers have important applications in reinforced composite materials, drug carriers, and adsorbents. However, due to the inherent multicomponent structure and complexity of wood fibers, the micronization process faces technical challenges such as poor fiber dispersion, difficulty in controlling uniformity, and high processing costs.

[0004] In the patent application with publication number CN 118181442 B, a magnetic crushing device, production tower and system for dry processing of wood fibers are disclosed. This patent belongs to a method for dry processing of wood fibers. The crushing method used in this patent is to use magnetic force to accelerate conductive particles, convert electromagnetic energy into kinetic energy of the conductive particles, thereby crushing the wood fibers in the cavity. The characteristic is that no toxic organic solvents are used in the crushing process. However, since the crushing cavity is open, the intermittent blowing scheme proposed in this patent relies on the gravity of the wood fibers themselves to fall and return to the crushing cavity. In actual production, the gravity of the wood fibers themselves cannot counteract the pressure generated by the residual gas in the blowing scheme, causing the wood fibers to fall and crush. The cavity is blocked, resulting in low aggregation of wood fibers in the crushing cavity; and a large amount of wood fibers collide with conductive particles during the crushing process, resulting in momentum conversion, which partially overflows the open crushing cavity and cannot be efficiently and continuously crushed into micro-nano particles by conductive particles, resulting in low energy utilization; the magnetic crushing device proposed in this patent needs to be equipped with a production tower, and the size of the production tower greatly limits the diameter of the magnetic crushing device, making it impossible for the conductive particles to obtain a greater breakdown speed in the crushing cavity, and the degree of micro-nanoization of the wood fibers is greatly reduced; this patent needs to be equipped with multiple sets of continuous magnetic crushing devices to process finer-sized wood fibers, which seriously affects the micro-nano processing efficiency. Summary of the Invention

[0005] The present invention aims to solve the problems existing in the prior art of dry processing of wood fiber micro-nanoization, innovates the existing magnetic crushing device for dry processing of wood fiber micro-nanoization, and overcomes the problems of low speed of conductive particles after magnetic acceleration in existing professional supporting equipment and obstruction of speed increase during magnetic acceleration due to adhesion of conductive particles to the wall. The present invention discloses a ring-shaped magnetic crushing system for micro-nano crushing of wood fibers, which makes it easier for conductive particles to obtain a higher breakdown speed during magnetic acceleration and achieves a higher degree of micro-nanoization of wood fibers.

[0006] In order to achieve the above purpose, the technical route adopted by the present invention is as follows:

[0007] The present invention provides a large-diameter magnetic crushing system for micro-nano dry processing of wood fibers, comprising an annular magnetic crushing device, a breathing device and an emission and recovery device. The annular magnetic crushing device comprises an annular crushing cavity, which is a closed structure and is filled with conductive particles. A plurality of electromagnetic drive devices are mounted on the outside of the annular crushing cavity, and an attraction device is arranged inside the annular crushing cavity. The attraction device is located between adjacent electromagnetic drive devices, and the attraction generated by the attraction device is used to offset the centrifugal force generated during the circular motion of the conductive particles. The conductive particle emission and recovery device is connected to the outside of the annular crushing cavity. Breathing ports are arranged in pairs at the top and bottom of the annular crushing cavity, and the breathing ports are connected to the breathing device.

[0008] The above-mentioned gravitational device and electromagnetic drive device exist together. A conductive particle emission and recovery device is connected to the outside of the annular crushing cavity. The conductive particles are started in the annular crushing cavity at the speed set by the emission device and accelerated by the electromagnetic drive device. The gravitational force generated by the gravitational device is used to offset the centrifugal force generated during the circular motion of the conductive particles, so that the conductive particles can move in a circular motion rapidly in the annular crushing cavity; the breathing device keeps the wood fiber particles in a suspended state in the crushing cavity.

[0009] As a further technical solution, the electromagnetic drive device includes a plurality of accelerating magnets, and an accelerating magnetic induction coil is wound around each accelerating magnet.

[0010] As a further technical solution, the accelerating magnet is in the form of a ring, each accelerating magnet is mounted on the ring-shaped crushing cavity, and multiple accelerating magnets are evenly arranged along the circumferential direction of the ring-shaped crushing cavity.

[0011] As a further technical solution, the attraction devices are evenly arranged along the radial direction of the inner ring of the annular crushing cavity, and each attraction device is provided with an attraction magnetic induction coil.

[0012] As a further technical solution, the attraction device and the electromagnetic drive device are arranged in groups accompanied by each other, and each group of attraction device and electromagnetic drive device exists in isolation from each other and does not interfere with each other.

[0013] As a further technical solution, the number of electromagnetic drive devices and gravitational device groups to be operated is selected by the control system according to the speed required for crushing, and the selection of electromagnetic drive devices and gravitational device groups in operation is kept symmetrical and uniform.

[0014] As a further technical solution, a condensation device is provided on the outer ring of the annular crushing cavity and the inner ring where the gravitational device is arranged.

[0015] As a further technical solution, the condensing device is two annular structures, which are respectively mounted on the outer ring and the inner ring of the annular crushing cavity, and the condensing device is sealed from the inner and outer rings of the annular crushing cavity.

[0016] As a further technical solution, it also includes a speed measuring device for detecting the moving speed of the conductive particles, and the speed measuring device is connected to the control system of the gravitational device.

[0017] As a further technical solution, the control system is also connected to the electromagnetic drive device to control the electromagnetic drive device.

[0018] As a further technical solution, a plurality of the breathing devices are arranged along the circumferential direction of the closed annular crushing cavity, and each breathing device is supplied with air independently or uniformly through the same air supply device.

[0019] As a further technical solution, when the breathing devices are uniformly supplied with air by the same air supply device, the air supply device is connected to each breathing device through an annular air supply pipe, and each breathing device includes a gas control valve;

[0020] The first outlet of the gas control valve is connected to the upper breathing tube, and the upper breathing tube is connected to the upper breathing port of the closed annular pulverizing cavity of the magnetic pulverizing device;

[0021] The second outlet of the gas control device is connected to the lower breathing tube, and the lower breathing tube is connected to the lower breathing port of the closed annular pulverizing cavity of the magnetic pulverizing device;

[0022] The control device controls the gas inlet and outlet of the first outlet and the second outlet, so that the wood fibers in the closed annular crushing cavity are kept in a suspended state.

[0023] As a further technical solution, the upper breathing port is also connected to a feeding device and a micronized powder collecting device;

[0024] The feeding device includes a first section of the rising pipe and a second section of the rising pipe; the first section of the rising pipe is connected to the upper breathing port of the closed annular crushing cavity of the magnetic crushing equipment, and the first section of the rising pipe and the second section of the rising pipe are connected through a first three-way valve; and the first three-way valve is also connected to the upper breathing pipe.

[0025] As a further technical solution, the material collecting device includes a discharge pipe and a collecting device; the discharge pipe connects the second section of the riser and the collecting device.

[0026] As a further technical solution, the top of the second section of the riser is connected to the feed pipe via a second three-way valve; the second three-way valve is also connected to the discharge pipe.

[0027] As a further technical solution, the lower breathing port and the upper breathing port are both provided with induction switches for sensing whether wood fibers enter the upper breathing tube or the lower breathing tube.

[0028] As a further technical solution, the launch recovery device includes an air supply system, a launch control device, a recovery control device, a launch valve and a recovery valve;

[0029] The launch valve is connected to the launch control device, the recovery valve is connected to the recovery control device, and the launch valve and the recovery valve are symmetrically arranged relative to the center of the closed annular crushing cavity;

[0030] The launch valve and the recovery valve have the same structure, each comprising a valve core, a launch recovery port, a valve body, a first air inlet pipe, and a second air inlet pipe; a valve core is disposed inside the valve body, and the valve core moves in an arc within the valve body; a launch recovery port is disposed on the side wall of the valve body, and the axis of the launch recovery port is tangent to the axis of the closed annular crushing cavity; and a first air inlet pipe and a second air inlet pipe are disposed on the side wall of the valve body, and the first air inlet pipe and the second air inlet pipe are connected to the air supply system to control the movement of the valve core;

[0031] The launch control device and the recovery control device have the same structure, each including a conductive particle bin, a magnetic induction coil, an electromagnet and a spring; the conductive particle bin is connected to the launch recovery port through a launch recovery pipe, the electromagnet is arranged in the conductive particle bin and connected to the launch recovery pipe, and a magnetic induction coil is wound around the electromagnet; the electromagnet, magnetic induction coil and spring assembly are used to generate energy conversion to launch conductive particles, or generate gravity to recover conductive particles, thereby realizing the launch and recovery of conductive particles.

[0032] As a further technical solution, a speed measuring device is provided at the end of the launch recovery pipeline, close to the launch valve and the recovery valve.

[0033] As a further technical solution, the air supply system consists of an air storage device, a connecting pipe, a two-stage pressure reducing valve, and a two-position five-way single-control solenoid valve; the internal pressure of the air storage device is controlled by the two-stage pressure reducing valve, and the air storage device is connected to the first air intake pipe and the second air intake pipe through a connecting pipe, and a two-position five-way single-control solenoid valve is also provided on the connecting pipe.

[0034] As a further technical solution, the launching valve includes multiple launching valves, which are arranged along the circumferential direction of the closed annular crushing cavity. The axis of the launching recovery port of each launching valve is tangent to the axis of the closed annular crushing cavity, and are arranged in a clockwise or counterclockwise direction in sequence.

[0035] As a further technical solution, the recovery valve includes multiple recovery valves, which are arranged along the circumferential direction of the closed annular crushing cavity. The axis of the emission recovery port of each recovery valve is tangent to the axis of the closed annular crushing cavity, and are arranged in a clockwise or counterclockwise direction in sequence.

[0036] The beneficial effects of the above embodiments of the present invention are as follows:

[0037] 1. The large-diameter annular accelerating magnetic crushing device proposed in the present invention can arrange more electromagnetic drive devices in the circumferential direction of the annular crushing cavity. This large-loop magnetic crushing device breaks through the diameter constraint of the physical restraint required for motor acceleration, so that the conductive particles can obtain a higher breakdown speed after being accelerated by the electromagnetic drive device. Compared with the small-diameter magnetic crushing device, the crushing mesh size is increased from the original 1000 mesh to more than 1500 mesh, and the crushing speed is shortened from the original 2 minutes to 1 minute. In the large-diameter annular crushing cavity, the movement of the conductive particles is closer to linear motion, which makes it easier to obtain a higher breakdown speed. The centrifugal force generated during the movement is smaller, and the movement state is stable.

[0038] 2. The closed annular crushing cavity proposed by the present invention solves the problem that in the magnetic crushing device for dry micro-nano processing of wood fibers, the wood fibers are not highly aggregated in the semi-closed annular crushing cavity and are easily scattered. This improves the effective crushing amount of the wood fibers and makes the micro-nano processing uniform. Breathing devices are evenly arranged in the circumferential direction of the closed annular crushing cavity. A constant pressure gas storage device is used to control the pressure and air supply of each exhalation and inhalation at a constant value. The suspension effect of the wood fibers is stable, avoiding the problem that the crushed micro-nano wood fibers do not fall autonomously due to the low gravity. The crushing efficiency is high, the degree of uniformity is high, and the energy utilization rate of the electromagnetic energy used in crushing is increased from 50% to 70%. The uniform breathing device arrangement scheme can select the number of arrangements according to the actual processing and production needs, so that the wood fibers can more easily maintain a uniform suspension state in the annular crushing cavity during crushing.

[0039] 3. The electromagnetic drive and gravitational device combination proposed in this invention selectively activates at the desired speed while maintaining a constant control current, thereby improving energy efficiency. Compared to magnetic pulverization devices for small-diameter wood fiber micro-nanoprocessing dry processing, the effect of each gravitational device is more isolated at large diameters, avoiding the impact of adjacent gravitational devices on the conductive particles in the same area when the device is arranged as a whole. Furthermore, a condensing device, combined with an inner and outer ring configuration, solves the problem of internal heating in magnetic pulverization devices for small-diameter wood fiber micro-nanoprocessing dry processing, improving cooling efficiency by 50% and reducing equipment loss by 50%.

[0040] 4. The adaptive air supply adjustment scheme proposed in the present invention uses a laser particle size analyzer to obtain real-time changes in particle size distribution based on the crushing efficiency of wood fibers from different sources, thereby adjusting the optimal air supply for each particle size distribution segment to prevent the wood fibers from adhering to the wall and achieve efficient crushing. Moreover, only one particle size change monitoring is required to obtain the general particle size distribution change of the wood fibers from that source. At the same time, the particle size distribution change pattern is also applicable to wood fibers of the same hardness but from different sources.

[0041] 5. The electromagnetic wood fiber micro-nano-disintegration conductive particle launch and recovery device proposed in this invention utilizes the conversion of electromagnetic and mechanical energy as launch energy for activation, imparting an initial velocity to the conductive particles before acceleration. This avoids the complexity and precision of pneumatic activation. By supplying a constant current, the launch and recovery device ensures the same initial velocity for each launch of the conductive particles. Energy consumption is low, and launch time is short, taking only a few to a dozen milliseconds. The initial velocity can be adjusted by varying the current, making it suitable for both variable-speed and variable-pitch launches. The air supply system is equipped with a two-stage pressure-reducing valve with adjustable output pressure. By selecting the appropriate output pressure based on the diameters of the pulverizing cavity and the launch cavity, the launch valve orifice is consistently coaxial with the launch cavity during each launch, ensuring consistent launch speed. The launch and recovery device is positioned on the outer ring of the annular pulverizing cavity and launches along a tangential direction of the cavity pipe. Due to the large-diameter, low-curvature annular pulverizing cavity and the presence of a gravity device, the conductive particles do not need to adhere to the wall. After launch, they rapidly move along the predetermined trajectory of the annular pulverizing cavity. The launch and recovery device is symmetrically arranged, with the launch and recovery ends functioning identically. Conductive particles are emitted from the recovery end, and the wood fiber micro-nano pulverization process can proceed normally simply by changing the direction of the current flowing through the electromagnetic drive. The device eliminates the need for re-introduction of the conductive particles, enabling their recycling. The system operates by simply controlling the opening and closing of the launch valve, which requires ascending and descending. The device has a simple structure, is easy to implement and control, and features a short operating time, no overheating, low equipment loss, and no need for additional cooling devices, resulting in high energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0043] Figure 1 This is a schematic diagram of the overall structure of the annular magnetic crushing system for micro-nano crushing of wood fibers proposed in the present invention;

[0044] Figure 2 This is a schematic diagram of the overall structure of the annular magnetic crushing system for removing, emitting and recovering wood fibers for micro-nano crushing proposed by the present invention;

[0045] Figure 3 This is a schematic structural diagram of a single breathing device of the annular magnetic crushing system for micro-nano crushing of wood fibers proposed in the present invention;

[0046] Figure 4 This is a schematic diagram of the overall structure of the emission and recovery device in the annular magnetic crushing system for micro-nano crushing of wood fibers proposed in the present invention;

[0047] Figure 5This is a schematic diagram of the structure of the launch valve and recovery valve in the launch recovery device, which are set on the annular magnetic crushing system for micro-nano crushing of wood fibers;

[0048] Figure 6 It is a schematic diagram of the structure of a launch valve or a recovery valve;

[0049] Figure 7 It is a schematic diagram of the internal structure of the launch device or recovery device;

[0050] Figure 8 This is a front view of the large-diameter magnetic disintegration device with the breathing device and launch recovery device removed;

[0051] Figure 9 This is a top view of the large-diameter magnetic disintegration device with the breathing device and launch recovery device removed;

[0052] Figure 10 This is a schematic diagram of the top structure of a large-diameter magnetic crushing device with the upper and lower end covers removed;

[0053] Figure 11 This is a schematic diagram of the bottom structure of a large-diameter magnetic crushing device after removing the upper and lower end covers;

[0054] Figure 12 This is the main view of the large-diameter magnetic crushing device after removing the outer condenser tube cover, inner condenser tube cover and lower support frame;

[0055] Figure 13 This is the main view of the large-diameter magnetic crushing device with the outer condenser tube cover removed;

[0056] Figure 14 It is the main cross-section of the large diameter magnetic crushing device;

[0057] Figure 15 It is a top cross-sectional view of a large diameter magnetic crushing device;

[0058] In the figure: 1. Magnetic crushing device, 2. Breathing device, 3. Launch recovery device;

[0059] 10. Support frame, 11. Lower end cover, 12. Outer end cover of accelerating magnet condenser tube, 13. Upper end cover, 14. Water inlet of condenser tube, 15. Water outlet of condenser tube, 16. Accelerating magnetic induction coil, 17. Accelerating magnet, 18. Annular crushing cavity, 19. Gravitational magnet, 110. Gravitational magnetic induction coil, 111. Accelerating magnet condenser tube, 112. Gravitational device condenser tube, 113. Inner end cover of gravitational device condenser tube, 114. Outer end cover of gravitational device condenser tube, 115. Lower condenser tube, 116. Accelerating magnet support frame, 117. Accelerating magnet inner condenser tube outlet tube, 118. Accelerating magnet condenser tube outlet tube, 119. Gravitational device condenser tube outlet tube, 120. Accelerating magnet condenser tube, 121. Accelerating magnet inner condenser tube, 122. Accelerating magnet support frame, 123. Inner end cover of accelerating magnet condenser tube;

[0060] 21. Support frame, 22. Gas storage device, 23. Pressure reducing valve, 25. Two-position five-way single-control solenoid valve, 26. Inhalation pipe, 27. Exhalation pipe, 28. Feed pipe, 29. Material separation pipe, 210. Collection device, 211. Second three-way valve, 212. First three-way valve, 213. Ring connecting pipe;

[0061] 31. Support frame, 32. Air storage device, 33. Pressure reducing valve, 34. Main air intake pipe, 35. Branch air intake pipe, 36. Branch air intake pipe, 37. Launch tube, 38. Launch control device, 39. Recovery control device, 310. Recovery pipe, 311. Launch valve, 312. Recovery valve, 313. Valve body, 314. Launch recovery port, 315. Valve core, 316. Rear end magnetic induction coil, 317. Rear end electromagnet, 318. Spring, 319. Front end magnetic induction coil, 320. Front end electromagnet. DETAILED DESCRIPTION

[0062] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0063] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly indicated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations;

[0064] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0065] Explanation of terms: The terms "install", "connect", "connect", "fix" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0066] As introduced in the background technology, in the prior art, due to the dense hydrogen bond structure between wood fiber molecules and the high hardness of wood fiber powder caused by the presence of lignin, huge energy needs to be consumed in the process of wood fiber micronization. When preparing micronized wood fiber powder by mechanical method, a mechanical grinder with a higher rotation speed is required. A large amount of heat is generated during the mechanical crushing process, which causes the wood fiber to gelatinize. Considering the heat dissipation problem, a large amount of solvent needs to be added during the crushing process, resulting in irreversible consumption of energy. This embodiment innovates the existing grinder and breaks through the problem that the speed of conductive particles after magnetic acceleration of existing professional supporting equipment is not high, and the speed increase during magnetic acceleration is hindered due to the conductive particles sticking to the wall. The present invention discloses a ring-shaped magnetic crushing system for wood fiber micronization, which is used in conjunction with a breathing device to make it easier for conductive particles to obtain a higher breakdown speed during magnetic acceleration, and the degree of wood fiber micronization is higher.

[0067] This embodiment specifically discloses a ring-shaped magnetic pulverization system for micro-nano crushing of wood fibers, which is suitable for natural wood fibers as raw materials, greatly improves the efficiency of micro-nano crushing of wood fiber powder, and has good practical utility and engineering application value; wherein, the ring-shaped magnetic pulverization system for micro-nano crushing of wood fibers is as follows: Figure 1 As shown, efficient and uniform crushing of wood fibers can be achieved.

[0068] The above-mentioned annular magnetic crushing system for micro-nano crushing of wood fibers consists of a magnetic crushing device 1, a breathing device 2 and an emission and recovery device 3. Its core component, the magnetic crushing device, consists of multiple sets of magnetic acceleration devices, gravitational devices and condensation devices to achieve micro-nano crushing of wood fibers. The large-diameter magnetic crushing device proposed in this embodiment is based on the theories of magnetic levitation, magnetic acceleration, and circular rotation. It proposes a method of using a magnetic field to accelerate the operation of micro-conductive particles in a magnetic field environment. At the same time, it uses suspension technology and variable centripetal force technology to enable the conductive particles to be stably and continuously accelerated in the center of the cavity. The accelerated conductive particles collide with the wood fibers in the closed annular crushing cavity to achieve micro-nano crushing of wood fibers.

[0069] The above-mentioned annular magnetic crushing system for micro-nano crushing of wood fibers breaks through the problems of low speed of conductive particles after magnetic acceleration in existing professional supporting equipment, and the conductive particles sticking to the wall, which leads to the speed increase being hindered during the magnetic acceleration process. It makes it easier for conductive particles to obtain a higher breakdown speed during the magnetic acceleration process, and the wood fibers are more evenly suspended and the degree of micro-nano crushing is higher.

[0070] The annular magnetic crushing system for micro-nano crushing of wood fibers proposed by the present invention is described in detail below with reference to the accompanying drawings:

[0071] Example 1

[0072] First, the annular magnetic crushing system for micro-nano crushing of wood fibers disclosed in this embodiment is as follows Figure 1As shown, it consists of three parts: a magnetic crushing device 1, a breathing device 2 and an emission and recovery device 3. The conductive particles are given an initial velocity by the emission device in the emission and recovery device, and are emitted into the cavity along the tangential direction of the closed annular crushing cavity of the magnetic crushing device 1, and are accelerated by the magnetic crushing device to obtain a higher speed to crush the wood fiber. After the crushing work is completed, the conductive particles are collected by the recovery device in the emission and recovery device at the other end of the symmetrical arrangement for the next micro-nano crushing. The emission device and the recovery device have the same structure and function. When the recovery device is used as the emission device for the next crushing work, it is only necessary to change the direction of the current to achieve the emission of the conductive particles; the crushing working area of ​​the core component, the magnetic crushing device, mainly includes three parts, a closed annular crushing cavity, an electromagnetic drive device and a gravitational device; the electromagnetic drive device is arranged on the closed annular crushing cavity, and the gravitational device is arranged on the inner circle of the closed annular crushing cavity. Specifically, in the closed annular crushing cavity, the electromagnetic drive device is arranged, and the gravitational device is arranged on the inner circle of the closed annular crushing cavity. The crushing cavity is filled with conductive particles and wood fibers; a plurality of electromagnetic drive devices are evenly arranged along the circumferential direction of the closed annular crushing cavity, and a gravitational device is evenly arranged on the inner circle of the annular crushing cavity, located in the gap between the two electromagnetic drive devices. Each electromagnetic drive device and the gravitational device are complete sets, accompanying each other, and the working state is in series; the electromagnetic drive device and the gravitational device are set to drive the conductive particles to perform circular motion in the closed annular crushing cavity, and gradually accelerate to a set maximum speed. The gravitational force generated by the gravitational device offsets the centrifugal force generated during the circular motion of the conductive particles, reduces resistance, and enables the conductive particles to perform circular motion quickly in the cavity without obstruction, accelerate to the set maximum speed faster, and collide with the wood fiber particles; the wood fiber enters the closed annular crushing cavity through the feed port of the breathing device, and breathes through the input of gas, ensuring that the wood fiber is evenly suspended in the closed annular crushing cavity.

[0073] Specifically, such as Figure 10 As shown, the electromagnetic drive device includes multiple accelerating magnets 17, accelerating magnetic induction coils 16 and accelerating magnet support frames 116, and an accelerating magnetic induction coil 16 is wound around each accelerating magnet 17; the accelerating magnet 17 is a ring, and each electromagnetic drive device is evenly arranged along the circumferential direction of the closed annular crushing cavity 18; the electromagnetic drive device drives the conductive particles to perform circular motion in the closed annular crushing cavity and gradually accelerates to a set maximum speed; the accelerating magnet 17 is fixed to the support frame 10 through the accelerating magnet support frame 116.

[0074] The gravitational device includes multiple gravitational magnets 19 and gravitational magnetic induction coils 110, and a gravitational magnetic induction coil 110 is wound around each gravitational magnet 19; the gravitational magnet 19 is a cylinder, and each gravitational device is evenly arranged along the circumferential direction of the inner end cover 113 of the gravitational device condenser tube, and is located in the gap between two adjacent electromagnetic drive devices; the gravitational force generated by the gravitational device is used to offset the centrifugal force generated during the circular motion of the conductive particles, reduce resistance, and enable the conductive particles to move rapidly in a circular motion in the cavity without obstruction, accelerate to the set maximum speed faster, and collide with the wood fiber particles.

[0075] The key components of the large-diameter magnetic pulverization device disclosed in this embodiment are composed of the above-mentioned electromagnetic drive device and gravitational device. During the pulverization operation, the accelerating magnetic induction coil 16 is energized to drive the conductive particles to maintain a running state. The magnetic field generated by the accelerating magnet 17 can limit the movement path of the conductive particles to the closed annular pulverization cavity area. At the same time, in the gravitational device that is matched with the electromagnetic drive device, the gravitational magnetic induction coil 110 is energized to impart a stable magnetic field to the gravitational magnet 19, which offsets the centrifugal force generated by the accelerated circular motion of the conductive particles by the electromagnetic drive device, preventing the conductive particles from colliding with the inner wall of the closed annular pulverization cavity 18 and causing damage, thereby affecting the trajectory integrity and stability of the continuously micronized conductive particles, while also reducing the loss of the conductive particles. By combining the above-mentioned two parts, the large-diameter magnetic pulverization device disclosed in this patent is formed, which enables large-sized wood fiber particles to be quickly pulverized into micronized powder to meet production requirements.

[0076] Furthermore, the electromagnetic drive device comprises an accelerating magnet wound around a magnetic induction coil. After the conductive particles are imparted with a certain velocity by the launch device, they are accelerated by the accelerating magnet to achieve a higher breakdown velocity. By varying the current flowing through the magnetic induction coil, the speed of the conductive particles' circular motion within the closed annular pulverization cavity 18 is increased to accommodate wood fiber raw materials of varying origins, particle sizes, and hardness. Due to the large diameter of the closed annular pulverization cavity 18, during instantaneous motion, the tangential linear motion of the conductive particles within the cavity more closely approximates the cavity's circular trajectory. During the initial acceleration, the conductive particles will exhibit slight wall-adhering motion. However, due to the large diameter of the motion trajectory and the presence of the gravitational device, this motion deviation is quickly corrected, and the particles collide with the wood fiber particles, thereby enhancing the stability and predictability of the motion trajectory.

[0077] Furthermore, in the circumferential direction of the closed annular pulverizing cavity, a breathing device and a tester are evenly arranged in the gap between the electromagnetic drive device and the gravitational device. The breathing device adaptively adjusts the air intake according to the particle size of the wood fiber pulverization to ensure that the wood fiber powder is evenly suspended in the closed annular pulverizing cavity. When the conductive particles make a circular motion in the closed annular pulverizing cavity to micro-nano-pulverize the wood fiber, the conductive particles are measured by the tester to obtain the instantaneous speed of the conductive particles or the distance from the inner wall of the closed annular pulverizing cavity. The value is transmitted to the energizing device of the gravitational magnetic induction coil 110 through the control element. Based on the instantaneous speed value and the distance from the inner wall of the closed annular pulverizing cavity obtained by feedback, the magnitude of the centrifugal force generated is calculated, so that the gravitational magnetic induction coil 110 generates a repulsive magnetic force of corresponding magnitude, and the conductive particles are controlled in the predetermined orbit of the closed annular pulverizing cavity, thereby preventing the conductive particles from colliding with the inner wall of the closed annular pulverizing cavity 18 and causing damage, thereby affecting the orbit integrity and stability of the continuously micronized conductive particles, and reducing the loss of the conductive particles.

[0078] The routing of the magnetic induction coil can be directly arranged according to the established lines of the lower condenser 115, the accelerating magnet inner condenser lead-out tube 117, the accelerating magnet condenser lead-out tube 118, the gravity device condenser lead-out tube 119, and the accelerating magnet condenser 120, thereby reducing the influence of the redundant magnetic field generated by the magnetic induction coil on the movement of the conductive particles.

[0079] Furthermore, each set of electromagnetic drive devices and gravitational devices operates in parallel, and their working and non-working states are independent of each other and do not affect each other, thereby reducing the influence of the magnetic force in the opposite direction to the centrifugal force generated by the previous gravitational device on the current motion state of the conductive particles when the conductive particles pass through the latter gravitational device.

[0080] Furthermore, the tester is designed with two different devices. One device is a ring-shaped photoelectric gate, evenly arranged along the circumference of the annular pulverizing cavity and located between the two electromagnetic drive devices. It is used to measure the instantaneous velocity of the conductive particles and transmit this information to the control element. The centrifugal force exerted on the measured conductive particles in this state of motion is then calculated. This determines the magnitude of the magnetic force required to be generated by the gravitational magnetic induction coil 110 in the opposite direction of the centrifugal force, as well as the magnitude of the current required to be input into the gravitational magnetic induction coil 110. This generates a corresponding gravitational force and corrects the trajectory of the conductive particles within the closed annular pulverizing cavity 18. During the initial circular acceleration phase, the speed of the conductive particles continuously changes, and the centrifugal force changes accordingly. The current in the gravitational coil also changes dynamically, allowing the conductive particles to move in a circular motion while suspended in the cavity, rather than adhering to the wall. This reduces the consumption of the conductive particles and allows them to collide with the wood fiber particles, thus achieving a crushing effect.

[0081] Another device is an infrared laser rangefinder, which is evenly arranged along the circumferential direction of the annular crushing cavity and located between the two electromagnetic drive devices. The distance between the conductive particles and the inner cavity wall close to the gravitational device measured by the infrared laser rangefinder is transmitted to the control element. In the initial circumferential acceleration motion stage, the conductive particles tend to move close to the gravitational device arrangement side of the inner wall of the closed annular crushing cavity. The distance is fed back to the control system through the infrared laser rangefinder, and the size of the magnetic force that the gravitational device needs to provide is calculated, and then the gravitational magnetic induction coil 110 required is obtained. The magnitude of the current to be input is used to correct the motion trajectory of the conductive particles to a predetermined position; when the conductive particles are gradually accelerated by the electromagnetic drive device to a predetermined trajectory threshold that breaks through the closed annular crushing cavity 18, the conductive particles tend to move toward the arrangement side of the accelerating magnet condenser 111 on the inner wall of the closed annular crushing cavity. The magnitude of the distance is fed back to the control system through the infrared laser rangefinder, and the magnitude of the magnetic force that the gravitational device needs to provide is calculated, and then the magnitude of the current that the gravitational magnetic induction coil 110 needs to input is obtained to correct the motion trajectory of the conductive particles to a predetermined position.

[0082] Furthermore, after the acceleration is completed, the circumferential motion speed of the conductive particles reaches a maximum value, and due to the presence of the large-diameter closed annular crushing cavity, the tangential linear motion of the conductive particles in the cavity is closer to the circular orbit of the cavity. In addition, under high-speed motion, the energy loss caused by the conductive particles impacting the wood fibers is extremely small, and its speed remains at the maximum value with almost no decrease. Therefore, in the stable operation stage, the force required to be provided by the gravity device tends to a constant value, thereby achieving a stable crushing process.

[0083] Furthermore, since the magnetic device generates a large amount of heat during continuous operation, a condensing device needs to be installed to enable the equipment to operate normally and avoid excessively high temperatures that cause carbonization of the wood fiber powder, resulting in irreversible changes and the generation of waste materials, affecting the micronization effect and the yield of micronized wood fibers.

[0084] Furthermore, the condensation device includes three sets, of which the first set is located on the outside of the closed annular crushing cavity 18, and includes a lower end cover 11, an upper end cover 13, an accelerating magnet condenser tube outer end cover 12, and an accelerating magnet condenser tube inner end cover 123, forming an annular condensation cavity, in which an accelerating magnet condenser tube 111 and an accelerating magnet condenser tube outlet tube 118 are arranged; the main part of the condenser tube is an annular structure, and the largest scale fits between the accelerating magnet condenser tube outer end cover 12 and the accelerating magnet condenser tube inner end cover 123, so as to achieve the best cooling effect; the condensation device adopts water circulation cooling.

[0085] Specifically, the second set of condensing devices is located on the inner side of the gravitational device, which includes a lower end cover 11, an upper end cover 13, an inner end cover 113 of the gravitational device condensing tube, and an outer end cover 114 of the gravitational device condensing tube, forming an annular condensing cavity, in which the gravitational device condensing tube 112 and the gravitational device condensing tube outlet pipe 119 are arranged; the main part of the condensing tube is an annular structure, and the largest scale fits between the outer end cover 114 of the gravitational device condensing tube and the inner end cover 113 of the gravitational device condensing tube, so as to achieve the best cooling effect; the condensing device adopts water circulation cooling, and this arrangement position can not only cool the gravitational device, but also cool the accelerating magnet 17 and the inside of the closed annular crushing cavity 18, thereby greatly improving the cooling effect and coverage rate.

[0086] Specifically, the third condensing device is located inside the accelerating magnet 17 , in which the accelerating magnet condenser 111 is arranged. The accelerating magnet 17 is led out through the accelerating magnet inner condenser lead-out pipe 117 and connected to the lower condenser 115 .

[0087] Furthermore, a lower condenser pipe 115 is arranged at the bottom of the lower end cover 11, which is used to connect the three condensing devices mentioned above to achieve the condensation cycle. Specifically, the accelerating magnet condenser pipe outlet pipe 117, the accelerating magnet condenser pipe outlet pipe 118, and the gravity device condenser pipe outlet pipe 119 are connected to the lower condenser pipe 115, and the condenser pipe water inlet 14 and condenser water outlet 15 are used to achieve the purpose of circulating cooling.

[0088] Furthermore, the uniformly distributed large-diameter magnetic crushing equipment for dry processing of wood fiber, due to the presence of a large-diameter closed annular crushing cavity, the internal space formed by it can be used as a personnel working area for office or maintenance workshop. The space-tight large-diameter magnetic crushing device is set according to actual production needs.

[0089] Furthermore, the condenser tube is made of copper or copper alloy with good thermal conductivity and corrosion resistance, but is not limited to copper and copper alloy.

[0090] Furthermore, the accelerating magnetic induction coil 16 and the gravitational magnetic induction coil 110 are wound with copper wire and connected to the current control element; providing excellent conductivity and low resistance, capable of reducing energy loss generated by the current.

[0091] Furthermore, the accelerating magnet 17 and the attracting magnet 19 are made of soft iron with a very low carbon content, which has good magnetic conductivity and low residual magnetism, can be magnetized and demagnetized quickly, and are suitable for the dynamic working conditions of this patent.

[0092] Furthermore, the components not mentioned above are made of high-quality carbon steel, such as No. 20 carbon steel, but not limited to No. 20 carbon steel.

[0093] Furthermore, multiple groups of breathing ports arranged in pairs up and down are provided on the annular crushing cavity 18, with the upper breathing port located at the top and the lower breathing port located at the bottom; a breathing device is provided at each pair of breathing ports; specifically, in this embodiment, the breathing device includes an air storage device and multiple breathing mechanisms, which are arranged along the circumferential direction of the magnetic crushing device, and the multiple breathing mechanisms are supplied with air by the same air storage device 22, which is supported by a support frame 21; the air storage device 22 is depressurized by a pressure reducing valve 23 and then connected to each breathing mechanism through an annular connecting pipe 213; each breathing mechanism includes a two-position five-way single-control solenoid valve 25, an air intake pipe 26, an air exhalation pipe 27, a feed pipe 28, a material separation pipe 29, a collection device 210; a second three-way valve 211, and a first three-way valve 212;

[0094] The annular connecting pipe 213 is connected to the two-position five-way single-control solenoid valve 25 through a pipeline. The two-position five-way single-control solenoid valve 25 is respectively connected to the intake pipe 26 and the exhalation pipe 27. The intake pipe 26 is connected to the breathing port at the top of the annular crushing cavity 18, and the exhalation pipe 27 is connected to the breathing port at the bottom of the annular crushing cavity 18. The top breathing port is also connected to the feed pipe 28, and the feed pipe 28 is also connected to the material separation pipe 29. The material separation pipe 29 is connected to the collecting device 210. A second three-way valve 211 is set at the fork position where the feed pipe 28 and the material separation pipe 29 are connected. A first three-way valve 212 is set at the fork position where the feed pipe 28 and the intake pipe 26 are connected.

[0095] Furthermore, the feed pipe 28 includes a first riser section and a second riser section; the first riser section is connected to the breathing port at the top of the closed annular crushing cavity of the magnetic crushing equipment, and the first riser section and the second riser section are connected through a first three-way ball valve 212; and the first three-way valve is also connected to the intake pipe.

[0096] During feeding, the upper and lower ports of the second three-way valve 211 and the first three-way valve 212 are opened, and the side ports are closed, forming a passage for the wood fibers to enter the closed annular crushing cavity; at this time, the breathing device does not work;

[0097] When the laser diffractometer in the pre-production debugging stage detects that the degree of micronization reaches the production standard, the first three-way valve 212 is controlled by the motor to be in the upper open, lower open, and right closed state, ensuring that the processed micronized wood fibers do not enter the intake pipe; at this time, the first three-way ball valve 212 is controlled by the motor to be in the upper closed, lower open, and right open state, ensuring that the processed micronized wood fibers enter the material separation pipe 29 through the second section of the riser pipe, and continue to enter the collection device 210 through the discharge pipe; in this working state, the exhalation pipe is controlled by the two-position five-way single-control solenoid valve to input gas into the closed annular crushing cavity, and the micronized wood fibers are blown into the collection device according to the above working method, completing the collection process after micronization.

[0098] Under normal working conditions, the above breathing device does not work;

[0099] When the upper annular photoelectric gate detects that wood fibers have entered the first section of the riser, a two-position five-way single-control solenoid valve inputs gas into the closed annular crushing cavity through the upper breathing tube, and at the same time, a certain amount of gas is output from the closed annular crushing cavity through the lower breathing tube, so that the wood fibers return to the annular crushing cavity.

[0100] When the lower annular photoelectric gate detects that wood fibers have entered the lower breathing tube, a two-position five-way single-control solenoid valve inputs gas into the closed annular crushing cavity through the lower breathing tube. At the same time, a certain amount of gas is output from the closed annular crushing cavity through the upper breathing tube to ensure that the wood fibers are always suspended in the closed annular crushing cavity.

[0101] Furthermore, the launch and recovery device includes an air supply system, a launch control device, a recovery control device, a launch valve, and a recovery valve; the launch valve is connected to the launch control device, and the recovery valve is connected to the recovery control device, and the launch valve and the recovery valve are symmetrically arranged relative to the center of the closed annular crushing cavity;

[0102] The launch valve 311 and the recovery valve 312 have the same structure, each comprising a valve core 315, a launch recovery port 314, a valve body 313, a first air inlet pipe, and a second air inlet pipe. The valve core is disposed within the valve body and moves in an arc within the valve body. The launch recovery port is disposed on the side wall of the valve body, and the axis of the launch recovery port is tangent to the axis of the closed annular pulverizing cavity. The first air inlet pipe and the second air inlet pipe are disposed on the side wall of the valve body. The first air inlet pipe and the second air inlet pipe are connected to the air supply system to control the movement of the valve core.

[0103] The launch control device 38 is connected to the launch valve 311 through the launch tube, and the recovery control device 39 is connected to the recovery valve 312 through the recovery tube 310;

[0104] The launch control device and the recovery control device have the same structure. The launch control device is used as an example for explanation below:

[0105] It includes a spring 318, a front-end magnetic induction coil 319, a front-end electromagnet 320, a rear-end electromagnet 317, and a rear-end magnetic induction coil 316; specifically, the front-end electromagnet 320 and the rear-end electromagnet 317 are dumbbell-shaped and are arranged at the front and rear ends of the launch chamber, the front-end electromagnet 320 is in an active state, and the rear-end electromagnet is in a fixed state, the two electromagnets are connected by a spring 318, and the spring 318, the front-end electromagnet 320, and the rear-end electromagnet 317 are located in a pipe in the launch chamber, the launch tube 37 is coaxially installed with the pipe in the launch chamber, and the conductive particles are located in the launch tube 37; the front-end magnetic induction coil 319 is wound around the front-end electromagnet 320, and the rear-end magnetic induction coil 316 is wound around the rear-end electromagnet 317; the front The components formed by the end electromagnet 320 and the front end magnetic induction coil 319, and the rear end electromagnet 317 and the rear end magnetic induction coil 316 generate an attractive force when the same direction of current is passed through them, causing the spring to be in a compressed state, converting the electromagnetic energy into the mechanical potential energy of the spring, and storing energy for the emission of conductive particles. When the two electromagnet components stop being energized, the attractive force disappears, the spring is in an extended state, and the mechanical potential energy is converted into the kinetic energy of the conductive particles, thereby realizing the emission of the conductive particles; during the recovery process, the two electromagnet components are energized, the spring returns to the compressed state, and the attractive force generated by the front end electromagnet 320 adsorbs the conductive particles, thereby realizing the recovery of the conductive particles; the launch chamber is fixed by a launch chamber support seat, and the bottom surface of the support seat is in the same plane as the bottom surface of the gas storage device support frame.

[0106] Specifically, currents in the same direction are passed through the front magnetic induction coil 319 and the rear magnetic induction coil 316, imparting magnetic fields to the front electromagnet 320 and the rear electromagnet 317. Since the magnetic fields of the two electromagnets are in the same direction, the opposite poles are in a relative state, and since opposite poles attract, the electromagnet compresses the spring. During the recovery operation, the front electromagnet 320 adsorbs the conductive particles onto it. During the launch operation, the two electromagnets are de-energized, and the spring releases potential energy, pushing the front electromagnet 320 forward along the launch tube 37. The energy is converted into kinetic energy of the conductive particles adsorbed by the front electromagnet 320, thereby launching the conductive particles. At this time, the launch valve is launched. The recovery port is connected to the launch recovery pipeline and is closed immediately after the launch is completed to ensure that the annular crushing cavity is well sealed. During the recovery work, the recovery device with the same function arranged on the symmetrical side energizes the front electromagnet 320 and the rear electromagnet 317 in the recovery device, giving the front electromagnet 320 and the rear electromagnet 317 a magnetic field. The two electromagnets attract each other, and the spring returns to the compressed state to store energy for the next launch. At the same time, the magnetic field generated by the front electromagnet 320 adsorbs the conductive particles in the annular crushing cavity into the recovery bin. At this time, the launch recovery port on the recovery valve is connected to the launch recovery pipeline, and the valve is closed immediately after the recovery is completed.

[0107] As a further technical solution, a speed measuring device is provided at the end of the launch recovery pipeline, close to the launch valve and the recovery valve.

[0108] As a further technical solution, the air supply system consists of an air storage device 32, a connecting pipe, a pressure reducing valve 33, and a two-position five-way single-control solenoid valve; the internal pressure of the air storage device is controlled by the pressure reducing valve 33, and the air storage device 32 is connected to two branch air intake pipes 35 and two branch air intake pipes 36 through a main air intake pipe 34, and a two-position five-way single-control solenoid valve is also provided on the connecting pipe.

[0109] As a further technical solution, the launching valve includes multiple launching valves, which are arranged along the circumferential direction of the closed annular crushing cavity. The axis of the launching recovery port of each launching valve is tangent to the axis of the closed annular crushing cavity, and are arranged in a clockwise or counterclockwise direction in sequence.

[0110] As a further technical solution, the recovery valve includes multiple recovery valves, which are arranged along the circumferential direction of the closed annular crushing cavity. The axis of the emission recovery port of each recovery valve is tangent to the axis of the closed annular crushing cavity, and are arranged in a clockwise or counterclockwise direction in sequence.

[0111] Furthermore, the conductive particles in this embodiment are ferroferric oxide or ferrous oxide, but are not limited to ferroferric oxide and ferrous oxide. The desired conductive particles can be selected based on the different sources, particle sizes, and hardness of the wood fiber raw materials, as well as production requirements. When the wood fiber particle size is large, the large-diameter magnetic pulverization device uses conductive particles with larger particle size and higher hardness. When micro-nano pulverization is performed on hardwood fibers (e.g., redwood, oak, etc.), which are relatively hard, the large-diameter magnetic pulverization device uses conductive particles with larger particle size and higher hardness. When micro-nano pulverization is performed on softwood fibers (e.g., fir, white pine, etc.), the large-diameter magnetic pulverization device uses conductive particles with smaller particle size, thereby achieving micro-nano pulverization of different types of wood fibers.

[0112] Furthermore, when conductive particles of different sizes and hardness are selected, the magnitude of the emission repulsion and recovery attraction generated in the emission device is adjusted to match the corresponding conductive particles, which can be achieved by simply changing the magnitude of the current.

[0113] Furthermore, the closed annular crushing cavity 18 of the large-diameter magnetic crushing device is made of high-quality carbon steel, such as 45# carbon steel, 40Cr carbon steel, 60# carbon steel, etc., but not limited to the above three types of carbon steel.

[0114] Furthermore, the wall thickness of the closed annular crushing cavity 18 is 10-20 mm.

[0115] It should be noted that this pulverization system is not limited to pulverizing wood fibers. Using the same principle to pulverize other substances is also within the scope of protection of this patent.

Claims

1. The annular magnetic crushing system for micro-nano crushing of wood fibers is characterized by: It includes an annular magnetic crushing device, a breathing device and an emission recovery device. The annular magnetic crushing device includes an annular crushing cavity, which is a closed structure and is filled with conductive particles. A plurality of electromagnetic drive devices are mounted on the outside of the annular pulverizing cavity, and a gravitational device is provided on the inner ring of the annular pulverizing cavity. The gravitational device is located between adjacent electromagnetic drive devices. The gravitational force generated by the gravitational device is used to offset the centrifugal force generated during the circular motion of the conductive particles. A device for emitting and recovering the conductive particles is connected to the outside of the annular pulverizing cavity. Breathing ports are provided in pairs at the top and bottom of the annular crushing cavity, and the breathing ports are connected to the breathing device; The breathing devices are arranged in a plurality along the circumferential direction of the closed annular crushing cavity, and each breathing device is supplied with air independently or through the same air supply device for unified air supply; When the breathing devices are supplied with gas by the same gas supply device, the gas supply device is connected to each breathing device through an annular gas supply pipe, and each breathing device includes a gas control valve; The first outlet of the gas control valve is connected to the upper breathing tube, and the upper breathing tube is connected to the upper breathing port of the closed annular pulverizing cavity of the magnetic pulverizing device; The second outlet of the gas control valve is connected to the lower breathing tube, and the lower breathing tube is connected to the lower breathing port of the closed annular pulverizing cavity of the magnetic pulverizing device; The gas control valve controls the gas inlet and outlet of the first outlet and the second outlet, so that the wood fibers in the closed annular crushing cavity are kept in a suspended state.

2. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 1 is characterized in that In, The electromagnetic drive device includes multiple accelerating magnets, each of which is wound with an accelerating magnetic induction coil; the accelerating magnets are ring-shaped, each accelerating magnet is mounted on an annular crushing cavity, and the multiple accelerating magnets are evenly arranged along the circumferential direction of the annular crushing cavity.

3. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 1 is characterized in that In, The gravitational devices are evenly arranged along the radial direction of the inner ring of the annular crushing cavity, and each gravitational device is provided with a gravitational magnetic induction coil; the gravitational devices and electromagnetic drive devices are arranged in groups accompanied by each other, and each group of gravitational devices and electromagnetic drive devices exists in isolation from each other and does not interfere with each other.

4. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 1 is characterized in that In, Condensation devices are provided on the outer ring and the inner ring of the annular crushing cavity.

5. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 1 is characterized in that In, It also includes a speed measuring device for detecting the moving speed of the conductive particles. The speed measuring device is connected to the control system of the attraction device; the control system is also connected to the electromagnetic drive device to control the electromagnetic drive device.

6. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 5, characterized in that: The upper breathing port is also connected to a feeding device and a micronized powder collecting device; The feeding device includes a first section of the rising pipe and a second section of the rising pipe; the first section of the rising pipe is connected to the upper breathing port of the closed annular crushing cavity of the magnetic crushing equipment, and the first section of the rising pipe and the second section of the rising pipe are connected through a first three-way valve; and the first three-way valve is also connected to the upper breathing pipe.

7. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 6, characterized in that: It also includes a material collecting device, which includes a discharge pipe and a collecting device; the discharge pipe is connected to the second section of the riser and the collecting device.

8. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 6, characterized in that: The top of the second section of the rising pipe is connected to the feed pipe through a second three-way valve; the second three-way valve is also connected to the discharge pipe.

9. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 6, characterized in that: The lower breathing port and the upper breathing port are both provided with induction switches for sensing whether wood fibers have entered the upper breathing tube or the lower breathing tube.

10. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 1, characterized in that In, The launch recovery device includes an air supply system, a launch control device, a recovery control device, a launch valve and a recovery valve; The launch valve is connected to the launch control device, the recovery valve is connected to the recovery control device, and the launch valve and the recovery valve are symmetrically arranged relative to the center of the closed annular crushing cavity; The launch valve and the recovery valve have the same structure, each comprising a valve core, a launch recovery port, a valve body, a first air inlet pipe, and a second air inlet pipe; a valve core is disposed inside the valve body, and the valve core moves in an arc within the valve body; a launch recovery port is disposed on the side wall of the valve body, and the axis of the launch recovery port is tangent to the axis of the closed annular crushing cavity; and a first air inlet pipe and a second air inlet pipe are disposed on the side wall of the valve body, and the first air inlet pipe and the second air inlet pipe are connected to the air supply system to control the movement of the valve core; The launch control device and the recovery control device have the same structure, each including a conductive particle bin, a magnetic induction coil, an electromagnet and a spring; the conductive particle bin is connected to the launch recovery port through a launch recovery pipe, the electromagnet is arranged in the conductive particle bin and connected to the launch recovery pipe, and a magnetic induction coil is wound around the electromagnet; the electromagnet, magnetic induction coil and spring assembly are used to generate energy conversion to launch conductive particles, or generate gravity to recover conductive particles, thereby realizing the launch and recovery of conductive particles.

11. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 10, characterized in that: A speed measuring device is installed at the end of the launch recovery pipeline, close to the launch valve and the recovery valve.

12. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 10, characterized in that: The air supply system consists of an air storage device, a connecting pipe, a two-stage pressure reducing valve, and a two-position five-way single-control solenoid valve; the internal pressure of the air storage device is controlled by the two-stage pressure reducing valve, and the air storage device is connected to the first air intake pipe and the second air intake pipe through a connecting pipe, and a two-position five-way single-control solenoid valve is also provided on the connecting pipe.

13. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 10, characterized in that: The launching valves include multiple launching valves, which are arranged along the circumferential direction of the closed annular crushing cavity. The axis of the launching recovery port of each launching valve is tangent to the axis of the closed annular crushing cavity, and are arranged in a clockwise or counterclockwise direction.

14. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 10, characterized in that: The recovery valve includes multiple recovery valves, which are arranged along the circumferential direction of the closed annular crushing cavity. The axis of the emission recovery port of each recovery valve is tangent to the axis of the closed annular crushing cavity, and are arranged in a clockwise or counterclockwise direction.

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