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

Abstract

The invention discloses an annular magnetic crushing system for wood fiber micro-nano crushing, which comprises an annular crushing cavity, a breathing device and an emission recovery device, the annular crushing cavity is a closed structure, and the annular crushing cavity is filled with conductive particles; a circle of electromagnetic driving device and a circle of attraction device are arranged in the annular crushing cavity, the electromagnetic driving device is located on the outer circle, the attraction device is located on the inner circle, the attraction device and the electromagnetic driving device exist in a mutual accompanying mode, and the outer portion of the annular crushing cavity is connected with a conductive particle emission and recovery device; and breathing openings are formed in the top and the bottom of the annular crushing cavity and are connected with a breathing device. The wood fiber powder regularly moves up and down under the action of the breathing device, collides with the conductive particles moving at a high speed in the annular cavity and is broken down and broken. The problems that the diameter of existing professional corollary equipment is limited, the initial velocity of conductive particles cannot be obtained, and the machining efficiency is insufficient due to the lack of a breathing device are solved.

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 mainly comes from wood, agricultural waste (such as straw, corn stalks, etc.) and some natural plant materials. Cellulose, hemicellulose and lignin in these materials are the main components of wood fiber. Wood fiber is not only a renewable biomass resource, but also biodegradable, which is of great significance in resource recycling and environmental protection. Functionalization of wood fiber by chemical, physical or biological methods can give it specific properties, such as enhanced mechanical strength, improved water resistance, conductivity or antibacterial properties. Functionalized wood fiber can be widely used in packaging materials, building materials, biodegradable plastics, textiles, filter materials and other fields, which will help to develop new green and environmentally friendly materials.

[0003] The micronization of wood fiber refers to processing it into micron or nanometer-level fibers, thereby increasing its specific surface area and enhancing its mechanical properties. Micronized wood fibers have important application significance in reinforcing composite materials, drug carriers, and adsorption materials. However, due to the multi-component structure of wood fiber itself and its natural complexity, the micronization process faces technical difficulties such as poor fiber dispersion, difficulty in uniformity control, and high processing costs.

[0004] In the patent application with the publication number CN 118181442 B, a magnetic crushing device, a production tower and a system for dry processing of wood fiber micro-nano are disclosed. The patent belongs to a method for dry processing of wood fiber. The crushing method used in this patent is to accelerate the conductive particles by magnetic force, convert the electromagnetic energy into the kinetic energy of the conductive particles, thereby crushing the wood fiber in the cavity. The characteristic is that no toxic organic solvent is used in the crushing process. However, since the crushing cavity is open, the intermittent blowing scheme proposed in the patent relies on the gravity of the wood fiber itself to fall and return to the crushing cavity. In actual production, the gravity of the wood fiber itself cannot counteract the pressure generated by the residual gas in the blowing scheme, so that the wood fiber falls and crushes. The cavity is blocked, resulting in low aggregation of wood fibers in the crushing cavity; and a large amount of wood fibers collide with the 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 by the 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 micro-nano degree of the wood fibers is greatly reduced; this patent needs to be equipped with multiple sets of continuous magnetic crushing devices to process wood fibers with finer particle sizes, which seriously affects the micro-nano processing efficiency. Summary of the invention

[0005] The present invention aims at the problems existing in the prior art in the 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 that the speed of conductive particles after magnetic acceleration of the existing professional supporting equipment is not high, and the conductive particles adhere to the wall, resulting in the speed increase being hindered during the magnetic acceleration process. The present invention discloses an annular magnetic crushing system for wood fiber micro-nano crushing, which makes it easier for the conductive particles to obtain a higher breakdown speed during the magnetic acceleration process, and the degree of wood fiber micro-nanoization is higher.

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

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

[0008] The above-mentioned gravitational device and electromagnetic driving device exist together. A conductive particle launching 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 launching device and accelerated by the electromagnetic driving device. The gravitational force generated by the gravitational device is used to offset the centrifugal force formed during the circular motion of the conductive particles, so that the conductive particles can move in a circular motion quickly 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, each of which is wound with an accelerating magnetic induction coil.

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

[0011] As a further technical solution, 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.

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

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

[0014] As a further technical solution, a condensing device is arranged on the outer ring of the annular crushing cavity and the inner ring where the gravitation 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 with 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 individually or uniformly through the same air supply device.

[0019] As a further technical solution, when the breathing devices are uniformly 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;

[0020] The first outlet of the gas control valve is connected to an upper breathing tube, and the upper breathing tube is connected to an upper breathing port of a closed annular pulverizing cavity of a 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 pulverizing 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 riser pipe section and a second riser pipe section; the first riser pipe section is connected to the upper breathing port of the closed annular crushing cavity of the magnetic crushing equipment, and the first riser pipe section and the second riser pipe section 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, and each includes 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 arranged inside the valve body, and the valve core moves in an arc in the valve body; a launch recovery port is arranged 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 arranged 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, and each includes 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, so as to realize 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 comprises multiple launching valves, and the multiple launching valves 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 they are arranged in a clockwise or counterclockwise direction in sequence.

[0035] As a further technical solution, the receiving valve includes multiple receiving valves, which are arranged along the circumferential direction of the closed annular crushing cavity. The axis of the emission recovery port of each receiving 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, and it is 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 in the present invention solves the problem that the wood fiber is not highly aggregated in the semi-closed annular crushing cavity and is easily scattered in the magnetic crushing device for dry micro-nano processing of wood fiber, thereby increasing the effective crushing amount of wood fiber and making the micro-nano degree uniform. A breathing device is evenly arranged in the circumferential direction of the closed annular crushing cavity, and 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 fiber is stable, and the problem that the micro-nano wood fiber after crushing does not fall autonomously due to the small gravity is avoided. The crushing efficiency is high, the degree of uniformity is high, and the energy utilization rate of the electromagnetic energy used during 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 fiber can more easily maintain a uniform suspension state in the annular crushing cavity during crushing.

[0039] 3. The electromagnetic drive device and gravitational device group proposed in the present invention can be selectively activated according to the required speed while keeping the control current unchanged, thereby improving energy utilization. Compared with the magnetic crushing device for micro-nano dry processing of small-diameter wood fibers, the effect of each gravitational device is more isolated under large diameters, avoiding the influence of adjacent gravitational devices on the conductive particles in the area when the small diameter is arranged as a whole. It is also equipped with a condensing device, which solves the problem of internal heating of the magnetic crushing device for micro-nano dry processing of small-diameter wood fibers by configuring the inner and outer circles together, improving the cooling effect by 50% and reducing the equipment loss rate by 50%.

[0040] 4. The adaptive air supply adjustment scheme proposed in the present invention obtains real-time particle size distribution changes according to the crushing efficiency of wood fibers from different sources through a laser particle size analyzer, thereby adjusting the optimal air supply for each particle size distribution segment to prevent the wood fibers from sticking to the wall and efficiently achieve crushing work. Moreover, it only takes one particle size change monitoring to obtain the general particle size distribution change of the wood fibers from that source; at the same time, the particle size distribution change law is also applicable to wood fibers of the same hardness but from different sources.

[0041] 5. The electromagnetic wood fiber micro-nano crushing conductive particle launch and recovery device proposed by the present invention uses the conversion of electromagnetic energy and mechanical energy as the launch energy to start, so that the conductive particles have an initial velocity before acceleration, avoiding the complexity and precision of the structure started by pneumatic means. The launch and recovery device can make the conductive particles have the same initial velocity each time they are launched by passing the same current, and the energy consumption rate is low, and the launch time is short, only a few to ten milliseconds are needed. The initial velocity is adjusted by changing the size of the current, and variable speed and variable pitch launch are applicable; the air supply system is equipped with a two-stage pressure reducing valve, the output pressure is adjustable, and the appropriate output pressure is selected according to the crushing cavity with different diameters and the launch cavity with different diameters, so that the launch valve port is in the same axial position with the launch cavity at each launch, thereby ensuring the stability of each launch speed; the launch and recovery device is arranged on the outer ring of the annular crushing cavity, and is launched along the tangent direction of the cavity pipeline. Due to the design of the large diameter and small curvature annular crushing cavity and the existence of the gravitational device, there is no need to consider the problem of conductive particles sticking to the wall, and after launch, they can quickly move along the predetermined orbit of the annular crushing cavity. The launch and recovery device is symmetrically arranged, and the launch end and the recovery end have the same function. Conductive particles are launched from the recovery end. It only needs to change the direction of the current of the electromagnetic drive device to make the wood fiber micro-nano crushing work normally. There is no need to re-introduce conductive particles to realize the recycling of conductive particles. It needs to rise and fall, and only needs the control system to control the opening and closing of the launch valve to realize the work. The device has a simple structure, is easy to implement and control, has a short working time, will not overheat, has a low equipment loss rate, does not require additional cooling devices, and has a high energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings in the specification, 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 It is a schematic diagram of the overall structure of the annular magnetic crushing system for micro-nano crushing of wood fibers proposed by the present invention;

[0044] Figure 2 It is a schematic diagram of the overall structure of the annular magnetic crushing system for removing emission and recovery of wood fiber micro-nano crushing proposed by the present invention;

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

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

[0047] Figure 5It is a schematic diagram of the structure in which a launch valve and a recovery valve in a launch recovery device are arranged on a ring-shaped 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 a launching device or a recovering device;

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

[0051] Fig. 9 It is a top view of the large diameter magnetic disintegration device with the breathing device and launch recovery device removed;

[0052] Fig.10 It is a schematic diagram of the top structure of a large-diameter magnetic crushing device after removing the upper end cover and the lower end cover;

[0053] Fig.11 It is a schematic diagram of the bottom structure of a large-diameter magnetic crushing device after removing the upper end cover and the lower end cover;

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

[0055] Fig.13 This is the front view of the large-diameter magnetic crushing device after removing the outer condenser tube cover;

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

[0057] Fig.15 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 lead-out tube, 118, accelerating magnet condenser tube lead-out tube, 119, gravitational device condenser tube lead-out 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 suction pipe, 27 exhalation pipe, 28 feeding pipe, 29 material separation pipe, 210 collecting device; 211 three-way ball valve, 212 three-way ball valve; 213 annular 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 descriptions are illustrative and 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 meanings as those 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 explicitly stated 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 "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[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, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0065] Terminology explanation section: The terms "install", "connect", "connect", "fixed" 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be 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 higher rotation speed is required. A large amount of heat is generated in 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 in 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-up is hindered due to the conductive particles sticking to the wall. The present invention discloses an annular magnetic crushing system for wood fiber micronization, which is used in conjunction with a breathing device, so that the conductive particles can more easily obtain a higher breakdown speed during the magnetic acceleration process, and the degree of wood fiber micronization is higher.

[0067] This embodiment specifically discloses a ring-shaped magnetic pulverizing system for micro-nano crushing of wood fibers, which is suitable for wood fibers of natural origin as raw materials, greatly improves the micro-nano efficiency of wood fiber powder, and has good practical utility and engineering application value; wherein, the ring-shaped magnetic pulverizing 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 annular magnetic crushing system for micro-nano crushing of wood fibers is composed of a magnetic crushing device 1, a breathing device 2 and an emission and recovery device 3. The core component, the magnetic crushing device, is composed 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 accelerating the operation of micro-conductive particles in a magnetic field environment by using a magnetic field. 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 the wood fibers.

[0069] The above set of 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 speed-up is hindered due to conductive particles sticking to the wall during magnetic acceleration. It makes it easier for conductive particles to obtain higher breakdown speed during magnetic acceleration, and the wood fiber suspension is more uniform, with a higher degree of micro-nano.

[0070] The annular magnetic crushing system for micro-nano crushing of wood fibers proposed by the present invention is described in detail below in conjunction with 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 a launch and recovery device 3. The conductive particles are given an initial velocity by the launch device in the launch and recovery device, and are launched 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 recovery device in the launch and recovery device at the other end of the symmetrical arrangement collects the conductive particles for the next micro-nano crushing. The launch device and the recovery device have the same structure and function. When the recovery device is used as the launch device for the next crushing work, it is only necessary to change the direction of the energized 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 driving device and a gravitational device; an electromagnetic driving device is arranged on the closed annular crushing cavity, and a gravitational device is arranged on the inner circle of the closed annular crushing cavity. Specifically, in the closed annular crushing cavity, the electromagnetic driving 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; along the circumferential direction of the closed annular crushing cavity, a plurality of electromagnetic driving devices are evenly arranged, and a gravitational device is evenly arranged in the inner circle of the annular crushing cavity, located in the gap between the two electromagnetic driving devices, and each electromagnetic driving device and the gravitational device are a set, accompanying each other, and the working state is in series; the electromagnetic driving 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, and the gravitational force generated by the gravitational device offsets the centrifugal force formed 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, Fig.10 As shown, the electromagnetic driving 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 in a ring shape, and each electromagnetic driving device is evenly arranged along the circumferential direction of the closed annular crushing cavity 18; the electromagnetic driving 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 18 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 quickly perform 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 crushing device disclosed in this embodiment are composed of the above-mentioned electromagnetic drive device and the gravitational device. During the crushing operation, the accelerating magnetic induction coil 16 is energized to drive the conductive particles to maintain the running state, and the magnetic field generated by the accelerating magnet 17 can limit the movement path of the conductive particles within the closed annular crushing 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 give the gravitational magnet 19 a stable magnetic field to offset the centrifugal force formed by the accelerated circular motion of the conductive particles by the electromagnetic drive device, prevent the conductive particles from colliding with the inner wall of the closed annular crushing cavity 18 and causing damage, affect the orbital integrity and stability of the continuously micronized conductive particles, and reduce the loss of the conductive particles. Through the above-mentioned two parts of the device, the large-diameter magnetic crushing device disclosed in this patent is formed, so that large-sized wood fiber particles can be quickly crushed into micronized powder to meet production requirements.

[0076] Furthermore, the electromagnetic drive device is an accelerating magnet wound with a magnetic induction coil. After the transmitting device gives the conductive particles a certain speed, they are accelerated by the accelerating magnet to obtain a higher breakdown speed. By changing the magnitude of the current of the magnetic induction coil, the speed of the circular motion of the conductive particles in the closed annular crushing cavity 18 is increased to adapt to wood fiber raw materials of different sources, different particle sizes, and different hardness. Due to the presence of the large-diameter closed annular crushing cavity 18, during instantaneous motion, the tangential linear motion of the conductive particles in the cavity is closer to the circular orbit of the cavity. In the initial acceleration state, the conductive particles will have a slight wall-adhering motion, but due to the large diameter of the motion orbit and the presence of the gravitational device, the above motion deviation will be corrected quickly and collide with the wood fiber particles, thereby making the motion orbit more stable and predictable.

[0077] Furthermore, in the circumferential direction of the closed annular pulverizing cavity, at the gap between the electromagnetic drive device and the gravitational device, a breathing device and a tester are evenly arranged. 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- and 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, and the value is transmitted to the energizing device of the gravitational magnetic induction coil 110 through the control element. According to the instantaneous speed value and the distance from the inner wall of the closed annular pulverizing cavity obtained by feedback, 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, so as to prevent 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 gravitational 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 device and gravitational device works in parallel, and their working state and non-working state 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 of which is a ring-shaped photoelectric gate, which is evenly arranged along the circumferential direction of the ring-shaped crushing cavity and is located between the two electromagnetic drive devices, and is used to measure the instantaneous speed of the conductive particles and transmit it to the control element, and then calculate the magnitude of the centrifugal force on the measured conductive particles in the motion state, so as to obtain the magnitude of the magnetic force in the opposite direction of the centrifugal force that the gravitational magnetic induction coil 110 needs to generate, and the magnitude of the current that the gravitational magnetic induction coil 110 needs to input, so as to generate corresponding gravitational force and correct the motion trajectory of the conductive particles in the closed ring-shaped crushing cavity 18. The speed of the conductive particles changes continuously in the initial circumferential acceleration motion stage, and the centrifugal force changes accordingly, and the current of the gravitational coil changes dynamically accordingly, so as to realize the circular motion of the conductive particles in the suspended position of the cavity, rather than the motion against the wall, thereby reducing the consumption of the conductive particles, and colliding with the wood fiber particles to achieve 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 needs to be obtained. The magnitude of the current to be input corrects 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, and the magnitude of the distance fed back to the control system by the infrared laser rangefinder is used to calculate the magnitude of the magnetic force that the gravitational device needs to provide, and then the magnitude of the current that the gravitational magnetic induction coil 110 needs to input is obtained, and the motion trajectory of the conductive particles is corrected to a predetermined position.

[0082] Furthermore, after the acceleration is completed, the circular motion speed of the conductive particles reaches a maximum value, and due to the existence of a 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, and 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 will generate 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 temperature causing carbonization of the wood fiber powder, resulting in irreversible changes and generation of waste materials, affecting the micronization effect and the yield of micronized wood fibers.

[0084] Furthermore, the condensation device includes three sets, wherein 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 lead-out 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, and 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, which 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 at the largest scale, 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 inner side of the closed annular crushing cavity 18, which greatly improves the cooling effect and coverage rate.

[0086] Specifically, the third set of condensation devices is located inside the accelerating magnet 17 , in which the accelerating magnet condenser 111 is arranged, and 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 115 is arranged at the bottom of the lower end cover 11, which is used for connecting the above three sets of condensing devices to realize condensation cycle. Specifically, the accelerating magnet inner condenser lead-out pipe 117, the accelerating magnet condenser lead-out pipe 118, and the gravitation device condenser lead-out pipe 119 are connected to the lower condenser 115, and the purpose of circulating cooling is achieved through the condenser water inlet 14 and the condenser water outlet 15.

[0088] Furthermore, the uniformly distributed large-diameter magnetic crushing equipment for dry processing of wood fibers, due to the existence of a large-diameter closed annular crushing cavity, the internal space formed by it can be used as a personnel work area for office or maintenance workshop arrangement. 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 acceleration 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 the energy loss generated by the current.

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

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

[0093] Further, a plurality of groups of breathing ports arranged in pairs up and down are arranged on the above-mentioned annular crushing cavity 18, the upper breathing port is located at the top, and the lower breathing port is located at the bottom; a breathing device is arranged at each breathing port arranged in pairs; 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, and the air storage device 22 is supported by a support frame 21; the air storage device 22 is connected to each breathing mechanism through an annular connecting pipe 213 after being decompressed by a pressure reducing valve 23; 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 collecting device 210; a three-way ball valve 211, and a three-way ball valve 212;

[0094] The annular connecting pipe 213 is connected to the two-position five-way single-control solenoid valve 25 through a pipeline, and the two-position five-way single-control solenoid valve 25 is respectively connected to the suction pipe 26 and the exhalation pipe 27. The suction 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; and the breathing port at the top 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, and the second three-way valve 211 is set at the fork position where the feed pipe 28 and the material separation pipe 29 are connected; the first three-way valve 212 is set at the fork position where the feed pipe 28 and the suction pipe 26 are connected;

[0095] Furthermore, the feed pipe 28 includes a riser section 1 and a riser section 2; the riser section 1 is connected to the breathing port at the top of the closed annular crushing cavity of the magnetic crushing equipment, and the riser section 1 and the riser section 2 are connected through a first three-way ball valve 212; and the first three-way valve is also connected to the intake pipe.

[0096] When 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 1; 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 state of upper opening, lower opening and right closing, ensuring that the processed micronized wood fibers will not enter the intake pipe; at this time, the first three-way ball valve 212 is controlled by the motor to be in the state of upper closing, lower opening and right opening, ensuring that the processed micronized wood fibers enter the 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 pulverizing cavity, and the micronized wood fibers are blown into the collection device according to the above working method to complete 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 into the first section of the ascending pipe, the two-position five-way single-control solenoid valve inputs gas into the closed annular crushing cavity through the upper breathing pipe, and at the same time, a certain amount of gas is output from the closed annular crushing cavity through the lower breathing pipe, 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, the 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, ensuring that the wood fibers are always suspended in the closed annular crushing cavity.

[0101] Furthermore, the launch recovery device comprises 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;

[0102] The launch valve 311 and the recovery valve 312 have the same structure, and each includes a valve core 313, a launch recovery port 314, a valve body 313, a first air inlet pipe and a second air inlet pipe; a valve core is arranged inside the valve body, and the valve core moves in an arc in the valve body, and a launch recovery port is arranged 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 arranged 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;

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

[0104] The launch control device and the recovery control device have the same structure, and the launch control device is taken 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 attraction when the current in the same direction is passed, so that the spring is in a compressed state, and the electromagnetic energy is converted into the mechanical potential energy of the spring, and the energy is stored for the emission of the conductive particles. When the two electromagnet components stop being energized, the attraction disappears, and 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 attraction 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, the front end magnetic induction coil 319 and the rear end magnetic induction coil 316 are supplied with current in the same direction, and the front end electromagnet 320 and the rear end electromagnet 317 are given a magnetic field. 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 each other, the electromagnet compresses the spring. During the recovery operation, the front end electromagnet 320 adsorbs the conductive particles thereon. During the launch operation, the two electromagnets stop being energized, and the spring releases potential energy, pushing the front end electromagnet 320 to move forward along the launch tube 37. The energy is converted into the kinetic energy of the conductive particles adsorbed by the front end 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 good sealing of the annular crushing cavity. 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 a 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 comprises multiple launching valves, and the multiple launching valves 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 they are arranged in a clockwise or counterclockwise direction in sequence.

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

[0111] Further, the conductive particles in this embodiment are ferroferric oxide or ferrous oxide, but are not limited to ferroferric oxide and ferrous oxide. The conductive particles required are selected independently according to the wood fiber raw materials of different sources, different particle sizes, different hardness and production requirements. When the particle size of the wood fiber is large, the large-diameter magnetic crushing device uses conductive particles with larger particle size and higher hardness; when the micro-nano crushing comes from hardwood wood fiber (for example: mahogany, oak, etc.), its hardness is large, and the large-diameter magnetic crushing device uses conductive particles with larger particle size and higher hardness; when the micro-nano crushing comes from softwood wood fiber (for example: fir, white pine, etc.), the large-diameter magnetic crushing device uses conductive particles with smaller particle size to achieve micro-nano crushing of different types of wood fibers.

[0112] Furthermore, when conductive particles of different particle sizes and hardness are selected, the magnitude of the launching repulsive force and the recovering attractive force generated in the launching 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 pulverizing cavity 18 of the large-diameter magnetic pulverizing device is made of high-quality carbon steel, such as No. 45 carbon steel, 40Cr carbon steel, No. 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 pulverizing 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 a launch recovery device, wherein the annular magnetic crushing device includes an annular crushing cavity, the annular crushing cavity is a closed structure, and the annular crushing cavity is filled with conductive particles; A plurality of electromagnetic driving devices are mounted outside the annular pulverizing cavity, and a gravitational device is mounted inside the annular pulverizing cavity. The gravitational device is located between adjacent electromagnetic driving devices, and 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 conductive particles is connected to the outside of the annular pulverizing 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.

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

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

4. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 1, characterized in that: Condensation devices are arranged 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, characterized in that: 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 gravitational device; the control system is also connected to the electromagnetic driving device to control the electromagnetic driving device.

6. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 1, characterized in that: 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 individually or uniformly through the same air supply device.

7. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 6, characterized in that: When the breathing devices are uniformly 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 an upper breathing tube, and the upper breathing tube is connected to an upper breathing port of a closed annular pulverizing cavity of a magnetic pulverizing device; 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; 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 pulverizing cavity are kept in a suspended state.

8. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 7, 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 riser pipe section and a second riser pipe section; the first riser pipe section is connected to the upper breathing port of the closed annular crushing cavity of the magnetic crushing equipment, and the first riser pipe section and the second riser pipe section are connected through a first three-way valve; and the first three-way valve is also connected to the upper breathing pipe.

9. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 7, characterized in that: The material collecting device comprises a discharge pipe and a collecting device; the discharge pipe connects the second section of the ascending pipe with the collecting device.

10. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 7, characterized in that: The top of the second section of the ascending 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.

11. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 7, characterized in that: 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.

12. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 1, characterized in that: The launch recovery device comprises 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, and each includes 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 arranged inside the valve body, and the valve core moves in an arc in the valve body; a launch recovery port is arranged 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 arranged 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, and each includes 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, so as to realize the launch and recovery of conductive particles.

13. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 12, characterized in that: A speed measuring device is provided at the end of the launch recovery pipeline, close to the launch valve and the recovery valve.

14. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 12, 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, 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.

15. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 12, 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.

16. The annular magnetic crushing system for micro-nano crushing of wood fibers according to claim 12, characterized in that: The receiving valves include multiple receiving valves, which are arranged along the circumferential direction of the closed annular crushing cavity. The axis of the launch recovery port of each receiving 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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