A magnetic crushing device for micro-nano dry processing of wood fibers

Abstract

The present invention discloses a magnetic pulverizing device for micro-nano dry processing of wood fibers, comprising an annular pulverizing cavity filled with conductive particles and wood fibers; a plurality of electromagnetic drive devices are mounted on the outer ring of the annular pulverizing cavity along its circumferential direction; a gravitational device is provided on the inner ring of the annular pulverizing cavity; the electromagnetic drive device is connected to an external control circuit to control changes in the current and magnetic field of the electromagnetic drive device; the conductive particles are accelerated by the electromagnetic force generated by the interaction between the moving magnetic field and the induced current; the electromagnetic drive device drives the conductive particles to move in the annular pulverizing cavity at a set speed; 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 quickly perform circular motion in the cavity and collide with wood fiber particles.

Description

Technical Field

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

[0002] At present, wood fibers need to be crushed in the process of being prepared into micro-nano wood fiber powder, and many crushing devices are disclosed in the prior art; however, the diameter of the wood fibers crushed by the existing crushing devices is still relatively large, and cannot reach the micro-nano level, and the effect is not very good. For example, in patent CN202111662522.4, a wood fiber crushing system is disclosed, which first performs a preliminary crushing of the wood fibers by a coarse hair roller and a fine hair roller, and then the material is chopped by the blade rotation. The wood fibers crushed by this crushing device cannot reach the micro-nano level at all, and the diameter of the crushed wood fibers cannot be adjusted. Moreover, the device is mostly belt-driven and chain-driven, and its transmission efficiency is unstable at high-speed transmission. In addition, the patented device is provided with a drying device, but no cooling device, which causes the equipment to be in a high-temperature state for a long time, affecting the operation of the equipment and reducing the life of the equipment. Similarly, patent CN202111246147.5 discloses a wood fiber crushing device, including a casing, a feeding chamber with an upper opening, a crushing chamber and a rotating chamber are provided above the casing, the lower end wall of the rotating chamber is rotatably connected to a rotating block, four evenly distributed sliding chambers are provided in the rotating block, the sliding chamber is connected to a storage block, the storage block is provided with a storage chamber, the casing is provided with a crushing mechanism, a crushing mechanism, a transport mechanism and a storage mechanism, the transport mechanism can transport the raw materials that are not completely crushed to the crushing chamber for re-crushing, the wood fibers crushed by this crushing device cannot reach the micro-nano level at all, and the diameter of the crushed wood fibers cannot be adjusted, and this patent relies on crushing to achieve very high energy consumption. Summary of the Invention

[0003] The present invention aims at the problems existing in the wood fiber crushing process in the prior art, innovates the existing grinder, overcomes the shortcomings of the existing professional supporting equipment, overcomes the insufficient speed of the existing grinder, and cannot grind finer particles. The present invention discloses a magnetic crushing device for micro-nano dry processing of wood fibers.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] The present invention provides a magnetic crushing device for micro-nano dry processing of wood fibers, comprising an annular crushing cavity filled with conductive particles; a plurality of electromagnetic drive devices are mounted on the annular crushing cavity along its circumferential direction; a gravitational device is provided on the inner ring of the annular crushing cavity; the electromagnetic drive device is connected to an external control circuit; the circuit controls the change of the current and magnetic field of the electromagnetic drive device; the conductive particles are accelerated by the electromagnetic force generated by the interaction between the moving magnetic field and the induced current; the electromagnetic drive device drives the conductive particles to move at a set speed in the annular crushing cavity; 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 rapidly in the cavity and collide with wood fiber particles; the strength and hardness of the conductive particles are much higher than those of the wood fibers; the high-speed conductive particles collide with the wood fibers to crush the wood fibers; a condensing device is provided on the outer ring of the annular crushing cavity; the annular crushing cavity has an annular blanking opening at the top and an annular feeding opening at the bottom.

[0006] 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.

[0007] As a further technical solution, the accelerating magnet is in the form of a ring, each accelerating magnet is mounted on the crushing cavity, and multiple accelerating magnets are evenly arranged along the circumferential direction of the crushing cavity.

[0008] As a further technical solution, the gravitational device includes a plurality of gravitational magnetic induction coils arranged along the radial direction of the inner ring of the crushing cavity. The gravitational magnetic induction coils are wound on the conductor and are electromagnetic coils with variable magnetic fields.

[0009] 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.

[0010] As a further technical solution, the speed measuring device is a conductive particle speed testing device or a conductive particle distance detection device.

[0011] As a further technical solution, the control system is also connected to the electromagnetic drive device to control the electromagnetic drive device.

[0012] As a further technical solution, the condensing device is an annular structure and is sleeved on the outer ring of the annular crushing cavity, and the condensing device and the outer ring of the annular crushing cavity are sealed.

[0013] As a further technical solution, it also includes a lower conical cover and an upper conical cover. The lower conical cover is arranged below the gravitational device and the electromagnetic drive device to guide the material to the feed port of the annular crushing cavity; the upper conical cover is arranged above the gravitational device and the electromagnetic drive device to guide the material to the drop port of the annular crushing cavity.

[0014] The beneficial effects of the above embodiments of the present invention are as follows:

[0015] The magnetic crushing device proposed in the present invention adopts a magnetic crushing method, using magnetic acceleration to accelerate the micro-conductive particles to a very high speed, and uses the collision between the conductive particles and wood fiber particles to crush the wood fibers with lower hardness. It has high preparation efficiency and good crushing effect. The crushing mesh size is increased from the original 200-300 mesh to more than 1000 mesh, and the crushing speed is shortened from 10 minutes to 2 minutes.

[0016] Furthermore, the present invention uses magnetic crushing to achieve micro-nano processing of wood fibers, using electromagnetic energy to crush wood fibers. Compared with traditional mechanical cutting or mechanical grinding, the energy utilization rate is increased from 10% to 50%.

[0017] Furthermore, in magnetic crushing, conductive particles of different sizes can be set to fully crush different raw materials with different particle sizes required to obtain micro-nano sized wood fiber particles; in magnetic crushing, the gravitational magnetic induction coil uses the dynamic change of current to control the gravitational output to offset the centrifugal force of the magnet's circular motion, so that the magnet moves in the middle position of the cavity instead of moving against the wall, which can effectively exert the kinetic energy of the magnet to collide and shear with the wood fiber particles, thereby breaking the wood fiber particles; according to the hardness of different types of wood fiber raw materials, the magnetic crushing device in this case can meet the degree of crushing of different raw materials by adjusting the size of the current, with good control performance and easy to realize automatic control; the static elimination device placed in the magnetic crusher can separate the raw material powder adhering to the cavity wall, so that the raw material can be fully crushed and the raw material can be better separated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the overall structure of a magnetic crushing device for micro-nano dry processing of wood fibers;

[0020] Figure 2 It is a top view of the magnetic crushing device;

[0021] Figure 3 It is a bottom view of the magnetic crushing device;

[0022] Figure 4 This is a schematic diagram of the top structure of the magnetic crushing device after removing the upper cone cover and the lower cone cover;

[0023] Figure 5 This is a schematic diagram of the bottom structure of the magnetic crushing device after removing the upper cone cover and the lower cone cover;

[0024] Figure 6 This is a schematic diagram of the structure of the magnetic crushing device without the conductive particles placed therein;

[0025] Figure 7 It is the front view of the magnetic crushing device;

[0026] Figure 8 It is a top view of the magnetic crushing device;

[0027] In the figure: 1, condenser, 2, upper condenser cover, 3, upper conical cover, 4, accelerating magnet, 5, accelerating magnetic induction coil, 6, top cover, 7, lower condenser cover, 8, bottom cover, 9, condenser, 10, condenser water inlet, 11, lower conical cover, 12, condenser water outlet, 13, grinding inner wall, 14, grinding outer wall, 15, equipment outer wall, 16, equipment inner wall, 17, static eliminator, 18, tester, 19, accelerating magnet condenser, 20, gravitational magnetic induction coil, 21, annular grinding cavity, 22, gravitational magnetic induction coil, 23, discharge port, 24, blanking port; DETAILED DESCRIPTION

[0028] 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.

[0029] 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;

[0030] Glossary: ​​"Inner circle" refers to the annular crushing cavity as the basis, and the small diameter circle enclosed is the inner circle; "outer circle" refers to the annular crushing cavity as the basis, and the outer space is the outer circle.

[0031] As described in the background art, the diameter of the wood fibers crushed by the pulverizing equipment in the prior art is still relatively large and cannot reach the micro-nano level, and the effect is not very good. In order to solve this problem, this embodiment discloses a magnetic pulverizing device for dry processing of wood fibers to be micro-nano, which is suitable for pulverizing raw materials of wood fibers; the pulverizing mesh size is increased from the original 200-300 mesh to more than 1000 mesh, and the pulverizing speed is shortened from 10 minutes to 2 minutes; the magnetic pulverizing device disclosed in this embodiment is based on the theory of magnetic levitation, magnetic acceleration, and circular rotation, and 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, the levitation technology and the centripetal force variable technology are used to enable the conductive particles to be stably and continuously accelerated in the center of the cavity. The accelerated micro-conductive particles collide with the expanded wood fibers to achieve micro-nano pulverization of the wood fibers. Among them, the expansion of the wood fibers is a microwave vibration heating expansion device, which can separate the crystalline water inside the wood fibers and expand them, thereby facilitating the crushing of the materials.

[0032] The present invention is described in detail below with reference to the accompanying drawings:

[0033] The magnetic crushing device for dry processing of wood fiber micronized nanostructured wood fibers disclosed in this embodiment is as follows: Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, it mainly includes four parts, namely an annular crushing cavity, a driving device is arranged on the crushing cavity, a gravitational device is arranged on the inner circle of the crushing cavity, and a condensing device is arranged on the outer circle of the crushing cavity. Specifically, the crushing cavity is filled with conductive particles and wood fiber raw materials; along the circumferential direction of the annular crushing cavity, a plurality of electromagnetic driving devices are mounted on it, and a gravitational device is arranged on the inner circle of the annular crushing cavity. The electromagnetic driving device drives the conductive particles to move in the annular crushing cavity at a set speed. 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 quickly perform circular motion in the cavity and collide with the wood fiber particles.

[0034] Specifically, the annular crushing cavity 21 is composed of a grinding inner wall 13 and a grinding outer wall 14. The grinding inner wall 13 and the grinding outer wall 14 are both annular structures. They are combined to form an annular crushing cavity, and the conductive particles and wood fibers are contained in the annular crushing cavity. The top of the annular crushing cavity is provided with an annular drop opening 24, and the bottom is provided with an annular discharge opening 23. The material passes through the annular crushing cavity, is crushed, and then moves upward. At the same time, the particles that do not meet the requirements can fall back into the annular crushing cavity under the action of gravity for further crushing.

[0035] The driving device includes a plurality of accelerating magnets 4 and accelerating magnetic induction coils 5. Each accelerating magnet 4 is wound with an accelerating magnetic induction coil 5. Each accelerating magnet 4 is annular and is mounted on an annular pulverizing cavity 21. The plurality of accelerating magnets 4 are evenly arranged along the circumference of the annular pulverizing cavity 21. The electromagnetic driving device drives the conductive particles to move within the annular pulverizing cavity 21 at a set speed.

[0036] The gravitational device comprises a plurality of gravitational magnetic induction coils 22 arranged radially along the inner ring of the annular pulverizing cavity. The gravitational magnetic induction coils 22 are wound around a conductor and are electromagnetic coils with a variable magnetic field. The gravitational force generated by the gravitational device is used to offset the centrifugal force generated during the circular motion of the conductive particles, allowing the conductive particles to rapidly perform circular motion within the cavity and collide with the wood fiber particles.

[0037] The condensing device is located in the outer ring of the annular crushing cavity, which includes an upper condensing tube cover 2 and a lower condensing tube cover 7, an outer wall 15 of the equipment, an inner wall 16 of the equipment, and the upper condensing tube cover 2 and the lower condensing tube cover 7 are combined together to form an annular condensing cavity, in which a condensing tube 1 is arranged; specifically, water circulation cooling is adopted in the condensing tube 1, and the condensing device is an annular structure and is mounted on the outer ring of the annular crushing cavity, and the condensing device and the outer ring of the annular crushing cavity are closed.

[0038] Specifically, the key components of the magnetic pulverization field consist of a drive section and a gravitational section. During the pulverization process, the accelerating magnetic induction coil 5 drives the conductive particles, while the accelerating magnet 4 confines the conductive particles to the cavity formed by the annular pulverization cavity, preventing them from colliding with the pulverization cavity and reducing their loss. Once the raw material is pulverized, the gravitational device in the middle of the magnetic pulverization generates a sufficiently large gravitational force to attract the conductive particles and firmly adhere them to the grinding inner wall 13. These two components form a magnetic pulverization device that rapidly crushes wood fiber raw materials into micro-nano powders.

[0039] The driving element is a coil encased in a magnet. The magnetic coil accelerates the conductive particles, giving them a certain speed. By varying the current flowing through the coil, the speed of the particles' rotation is increased. The conductive particles are continuously accelerated in the magnetic field. Under the influence of centrifugal force, they rotate closely against the outer wall 14 of the mill, preventing them from colliding with the wood fibers and breaking them. This also consumes a large amount of energy. Therefore, gravity is required to offset the centrifugal force generated by the particles' circular motion, allowing them to rapidly move in a circular motion within the cavity and collide with the wood fiber particles, breaking them up.

[0040] Furthermore, the conductive particles in this embodiment are ferroferric oxide, but are not limited to ferroferric oxide. Conductive particles of different particle sizes can be crushed into wood fiber particles of different sizes. By changing the particle size of the conductive particles, wood fibers of different particle sizes can be obtained.

[0041] Furthermore, the outermost device wall 15 of the magnetic pulverization device is wrapped with carbon steel, and the accelerating magnetic induction coil 5 serves as the main driving part to drive the conductive particles to perform magnetic pulverization.

[0042] Furthermore, the magnetic crushing device also includes a tester 18 for detecting the movement speed of the conductive particles. The conductive particles pass through the tester 18 to measure the instantaneous speed of the conductive particles or the distance from the inner and outer walls, and the value is transmitted to the gravitational magnetic induction coil 20 through the control element. According to the different instantaneous speeds transmitted, the centrifugal force generated is calculated, so that the gravitational magnetic induction coil 20 generates a corresponding magnetic force, which defines the conductive particles in a specified area of ​​the annular crushing cavity 21, prevents the conductive particles from colliding with the annular crushing cavity 21, reduces the loss of the conductive particles, and limits the movement area of ​​the conductive particles.

[0043] Furthermore, all the wiring of the magnetic coil can be directly arranged according to the wiring route of the condenser tube 1, which can reduce the impact on the movement of the powder.

[0044] Furthermore, the above-mentioned tester 18 is designed with two different devices, one of which is as follows Figure 7 The laser velocity measuring device shown transmits the speed of the conductive particles measured by each laser velocity measuring device to the control element, which then calculates the magnitude of the centrifugal force corresponding to the measured conductive particles, thereby deriving the magnitude of the gravitational force required by the gravitational magnetic induction coil and the corresponding magnitude of the current in the gravitational magnetic induction coil. As the circumferential velocity of the conductive particles continuously changes, the centrifugal force changes accordingly, and the magnitude of the current in the gravitational magnetic induction coil changes dynamically accordingly, thereby achieving circular motion of the conductive particles in the suspended position of the cavity, rather than motion against the wall.

[0045] Another device such as Figure 8The infrared distance measuring device shown is installed on the inner grinding wall 13 and the outer grinding wall 14 of the annular pulverizing cavity. The distance between the fine powder and the inner and outer cavity walls, measured by distance sensors on both sides, is transmitted to a control element. When the conductive particles' speed increases, the distance from the outer wall decreases. In this case, the coil current of the gravitational magnetic induction coil needs to be increased, increasing the gravitational force and pulling the conductive particles toward the inner wall. Conversely, when the conductive particles' speed decreases, the distance from the outer wall increases. In this case, the coil current of the gravitational magnetic induction coil needs to be reduced to reduce the gravitational force and pull the conductive particles toward the outer wall. The current of the gravitational magnetic induction coil is dynamically adjusted based on the distance between the conductive particles and the inner and outer walls, allowing the conductive particles to move within a specific pulverizing cavity position, preventing them from hitting the wall and reducing their consumption. Furthermore, the conductive particles collide with the wood fiber particles, causing them to break up. When the conductive particles have a certain speed, they remain suspended in the air due to rotation, preventing them from falling. Once the raw materials are crushed, the magnetic crusher's intermediate attraction generates sufficient force to attract the conductive particles and firmly adhere them to the crusher's inner wall. Because the magnetic device generates a significant amount of heat during operation, cooling devices are required in both the chamber wall and the magnet to ensure proper operation and prevent excessive temperatures from carbonizing the wood fiber powder.

[0046] Furthermore, the condensing device in this embodiment includes two sets, one of which is located in the outer ring of the annular crushing cavity, which includes an outer wall 15 of the device, an inner wall 16 of the device, an upper condensing tube cover 2 and a lower condensing tube cover 7. The outer wall 15 of the device and the inner wall 16 of the device are annular rings, the upper condensing tube cover 2 is located at the upper part of the annular ring, and the lower part is the lower condensing tube cover 7. The outer wall 15 of the device, the inner wall 16 of the device, the upper condensing tube cover 2 and the lower condensing tube cover 7 are combined together to form an annular condensing cavity, and a condensing tube 1 is arranged in the annular condensing cavity; specifically, the condensing tube 1 is formed by Water circulation cooling is used. The condensing device is an annular structure and is mounted on the outer ring of the annular crushing cavity. The condensing device and the outer ring of the annular crushing cavity are sealed by a bottom cover 8; another set is a condensing tube 9 located on the accelerating magnet and the gravitational magnetic induction coil. The condensing tube 9 is connected in series with the condensing tube 1 to cool the wood fiber during the crushing process. Because the combustion point of wood fiber is generally low, during the crushing process, the wood fiber is very easy to ignite under the grinding action of the conductive particles. Therefore, a condensing device is required to cool it.

[0047] Furthermore, the condenser 1 is a condenser wound in circles, and a condenser water inlet 10 and a condenser water outlet 12 are provided on the outer wall 15 of the device.

[0048] Furthermore, an upper conical cover 3 is provided above the annular crushing cavity, the driving device and the gravity device; the upper conical cover 3 can completely cover the gravity device, and the outer edge of the bottom extends to the top of the crushing cavity. The purpose of providing the upper conical cover 3 is mainly to scatter the wood fiber particles falling from above into the annular crushing cavity.

[0049] Furthermore, a lower conical cover 11 is provided below the gravity device; the lower conical cover 11 can completely cover the gravity device. The purpose of providing the lower conical cover 11 is mainly to allow the wood fiber particles entering from below to be drained into the annular crushing cavity, so that the material moves upward from the bottom of the annular crushing cavity.

[0050] Furthermore, the thickness of the above-mentioned equipment inner wall 16 and equipment outer wall 15 is 10-20 mm; the equipment outer wall 15 and equipment inner wall 16 are made of high-quality carbon steel, such as 45 carbon steel, 60 carbon steel, 60M carbon steel, etc., but not limited to the above three types of carbon steel.

[0051] Furthermore, the accelerating magnetic induction coil 5 and the gravitational magnetic induction coil 20 are wound with copper wire and connected to the current control element;

[0052] Furthermore, in this embodiment, an electrostatic eliminator 17 is provided on the grinding outer wall 14. The electrostatic eliminator 17 performs high-voltage discharge at an irregular interval to eliminate the static electricity of the wood fiber raw materials adhering to the wall of the annular crushing cavity 21, so that the wood fiber raw materials can be better crushed. At the same time, it prevents the wood fiber raw materials from being excessively adhered to the wall of the annular crushing cavity 21, making it difficult to reduce the temperature and causing low material yield.

[0053] Furthermore, the static eliminator 17 adopts an existing air source DC electronic wind rod.

[0054] The magnetic crushing device proposed in this embodiment adopts a magnetic crushing method, uses magnetic acceleration to accelerate the micro-conductive particles to a very high speed, and uses the collision of the conductive particles with the wood fiber particles to crush the wood fiber with lower hardness. It has high preparation efficiency and good crushing effect. The crushing mesh size is increased from the original 200-300 mesh to more than 1000 mesh, and the crushing speed is shortened from 10 minutes to 2 minutes. In the magnetic crushing, by setting conductive particles of different sizes, different raw materials can be fully crushed to obtain micro-nano sized wood fiber particles. The gravitational magnetic induction in the magnetic crushing The coil uses the dynamic changes of the current to control the gravitational output to offset the centrifugal force of the magnet's circular motion, causing the magnet to move in the middle of the cavity rather than against the wall. This effectively utilizes the magnet's kinetic energy to collide and shear with the wood fiber particles, thereby breaking the wood fiber particles. Depending on the hardness of different types of wood fiber raw materials, the magnetic crushing device in this case can adjust the current to meet the degree of crushing of different raw materials. The static eliminator placed in the magnetic crusher can separate the raw material powder adhering to the cavity wall, allowing the raw materials to be fully crushed and better separated.

[0055] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A magnetic crushing device for dry micro-nano processing of wood fibers, characterized in that: The invention comprises an annular crushing cavity filled with conductive particles; a plurality of electromagnetic drive devices are mounted on the annular crushing cavity along its circumferential direction; a gravitational device is provided on the inner ring of the annular crushing cavity; the electromagnetic drive device is connected to an external control circuit; the circuit controls the changes in the current and magnetic field of the electromagnetic drive device; the conductive particles are accelerated by the electromagnetic force generated by the interaction between the moving magnetic field and the induced current; the electromagnetic drive device drives the conductive particles to move at a set speed in the annular crushing cavity; 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 rapidly in a circular motion in the cavity and collide with the wood fiber particles; the strength and hardness of the conductive particles are much higher than those of the wood fiber; the high-speed conductive particles collide with the wood fiber to crush the wood fiber; a condensing device is provided on the outer ring of the annular crushing cavity; the annular crushing cavity has an annular blanking port at the top and an annular feeding port at the bottom.

2. The magnetic crushing device for dry micro-nano processing of wood fibers according to claim 1, characterized in that: The electromagnetic drive device includes a plurality of accelerating magnets, each of which is an electromagnetic coil with a variable magnetic field, and the magnetic field is changed by changing the current.

3. The magnetic crushing device for dry micro-nano processing of wood fibers according to claim 2, characterized in that: The accelerating magnets are annular in shape, each accelerating magnet is sleeved on the crushing cavity, and multiple accelerating magnets are evenly arranged along the circumferential direction of the crushing cavity.

4. The magnetic crushing device for micro-nano dry processing of wood fibers according to claim 1, characterized in that: The gravitational device comprises a plurality of gravitational magnetic induction coils arranged along the radial direction of the inner ring of the crushing cavity. The gravitational magnetic induction coils are wound on a conductor and are electromagnetic coils with a variable magnetic field.

5. The magnetic crushing device for micro-nano dry processing 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 attraction device. The control system is also connected to the electromagnetic drive device to control the electromagnetic drive device.

6. The magnetic crushing device for micro-nano dry processing of wood fibers according to claim 5, characterized in that: The speed measuring device is a conductive particle speed testing device or a conductive particle distance detection device.

7. The magnetic crushing device for dry micro-nano processing of wood fibers according to claim 1, characterized in that: The condensing device is an annular structure and is sleeved on the outer ring of the annular crushing cavity. The condensing device and the outer ring of the annular crushing cavity are sealed.

8. The magnetic crushing device for micro-nano dry processing of wood fibers according to claim 7, characterized in that: Condensation pipes are also provided on the electromagnetic driving device and the attraction device, and the condensation pipes are connected in series with the condensation device.

9. The magnetic crushing device for dry micro-nano processing of wood fibers according to claim 7, characterized in that: The annular grinding cavity consists of an annular grinding inner wall and an annular grinding outer wall.

10. The magnetic crushing device for dry micro-nano processing of wood fibers according to claim 1, characterized in that: It also includes a lower conical cover and an upper conical cover. The lower conical cover is arranged below the gravitational device and the electromagnetic drive device to guide the material to the feed port of the annular crushing cavity; the upper conical cover is arranged above the gravitational device and the electromagnetic drive device to guide the material to the dropout port of the annular crushing cavity.

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