Breathing device and method for magnetic pulverization of wood fibers

Abstract

The invention discloses a breathing device and method for magnetic pulverization of wood fibers, comprising an air storage device, a gas control valve, a feeding device, a material collecting device and a control device; the air storage device is connected to the inlet of the gas control valve, the first outlet of the gas control valve is connected to an upper breathing tube, the upper breathing tube is connected to the upper breathing port of a closed annular pulverization cavity of a magnetic pulverization device; the upper breathing port is also connected to a feeding device and a material collecting device; the second outlet of the gas control device is connected to a lower breathing tube, the lower breathing tube is connected to the lower breathing port of the closed annular pulverization cavity of the magnetic pulverization device; the control device keeps the wood fibers in the closed annular pulverization cavity in a suspended state by controlling the inflow and outflow of gas from the first outlet and the second outlet.

Description

Technical Field

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

[0002] Wood fiber, an important natural material, is widely available, abundant, inexpensive, environmentally friendly, and renewable. It is one of the most important applicable energy sources after fossil fuels such as coal, oil, and natural gas. The greatest advantage of wood fiber resources lies in the biosafety of their natural chemical composition. The efficient utilization of wood fiber, which can help reduce dependence on fossil raw materials, transform it into high-value-added products, and promote sustainable development in today's society, is a current research hotspot. Due to the dense hydrogen bond network between wood fiber molecules, the micronization and nanofiberization process requires enormous energy.

[0003] Currently, wood fiber is converted into micronized products through a series of chemical and mechanical processes. These methods require the use of large amounts of toxic chemical solvents that cannot be recycled and reused, resulting in high energy consumption. Therefore, using dry processing equipment to efficiently produce micronized wood fiber powder without the use of organic solvents is an urgent problem to be solved.

[0004] Patent application publication number CN 118181442 B discloses a magnetic pulverization device, production tower, and system for dry micro-nanoprocessing of wood fibers. This patent pertains to a method for dry processing of wood fibers. The pulverization method employed in this patent utilizes magnetic force to accelerate conductive particles, converting electromagnetic energy into kinetic energy for the conductive particles' motion, thereby pulverizing the wood fibers within a cavity. The patent is characterized by the absence of toxic organic solvents during the pulverization process. However, due to the open pulverization cavity, the intermittent air blowing scheme proposed in this patent relies on the wood fibers' own gravity to fall back into the pulverization cavity. In actual production, the micro-nanoscale wood fibers' own gravity cannot counteract the equalizing pressure generated by the residual gas in the air blowing scheme, hindering their descent into the pulverization cavity. This results in low aggregation of the wood fibers within the pulverization cavity and a slow rate of descent due to their own gravity. The overall efficiency of the device needs to be improved. Furthermore, a large amount of wood fibers collide with the conductive particles during the pulverization process, resulting in momentum conversion, causing some of the fibers to overflow the open pulverization cavity, preventing them from being efficiently and continuously micro-nanoprocessed by the conductive particles, resulting in low energy utilization. Summary of the Invention

[0005] The present invention aims at solving the problems existing in the wood fiber crushing process in the prior art and discloses a breathing device and method for magnetic crushing of wood fibers, which can keep the wood fibers more evenly dispersed in the crushing device.

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

[0007] In a first aspect, the present invention provides a breathing device for magnetically crushing wood fibers, comprising a gas storage device, a gas control valve, a feeding device, a material collecting device, and a control device;

[0008] The gas storage device is connected to the inlet of the gas control valve, the first outlet of the gas control valve is connected to the upper breathing tube, and the upper breathing tube is connected to the upper breathing port of the closed annular crushing cavity of the magnetic crushing device; and the upper breathing port is also connected to the feeding device and the material collecting device;

[0009] 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;

[0010] The control device controls the gas inlet and outlet of the first outlet and the second outlet, so that the wood fibers in the closed annular crushing cavity are kept in a suspended state.

[0011] As a further technical solution, the feeding device includes a first section of the riser and a second section of the riser; the first section of the riser is connected to the upper breathing port of the closed annular crushing cavity of the magnetic crushing equipment, and the first section of the riser and the second section of the riser are connected through a first three-way valve; and the first three-way valve is also connected to the upper breathing pipe.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] As a further technical solution, a pressure reducing valve is provided at the outlet of the gas storage device; an air pressure sensor is provided in the gas storage device and connected to the control system to implement negative feedback control to monitor the air pressure in the gas storage device to maintain a constant level.

[0016] As a further technical solution, the control system controls the gas supply of the gas storage device according to the particle size of the wood fibers.

[0017] As a further technical solution, the control system is also connected to a laser particle size analyzer located in the annular pulverizing cavity.

[0018] As a further technical solution, static eliminators are arranged on the feeding device and the material collecting device.

[0019] In a second aspect, the present invention also provides a method for using a breathing device for magnetically crushing wood fibers; as follows:

[0020] When wood fibers are detected entering the upper respiratory tube, the first outlet inputs gas into the closed annular crushing cavity; the second outlet sucks gas out of the closed annular crushing cavity;

[0021] When wood fibers are detected entering the lower breathing tube, the first outlet sucks out gas from the closed annular crushing cavity; the second outlet inputs gas into the closed annular crushing cavity;

[0022] The wood fiber particles are kept in suspension in the crushing cavity through the alternating breathing of the first outlet and the second outlet.

[0023] When the wood fiber powder reaches a certain particle size, the first outlet stops working and the second outlet continues to output gas, blowing the micronized wood fiber powder into the discharge pipe and then into the collection device to complete the crushing work;

[0024] When it is necessary to add material into the closed annular crushing cavity, both the first outlet and the second outlet stop working, and the feeding device adds material.

[0025] The beneficial effects of the above embodiments of the present invention are as follows:

[0026] 1. The breathing device of the present invention can enable wood fibers to perform different corresponding tasks when different valve core positions are combined, thereby achieving integrated control of feeding, exhalation, blowing, and separation (material collection), until the input wood fibers are completely micronized to meet production requirements. The breathing device uses a constant pressure air storage device to control the pressure and air supply of each exhalation and inhalation at a constant value, which stabilizes the suspension effect of the wood fibers and avoids the problem of the micronized wood fibers not falling spontaneously due to low gravity after crushing. The crushing efficiency is high and the degree of uniformity is high. Compared with traditional mechanical cutting or mechanical grinding and crushing, the breathing device proposed in the present invention, when combined with a pulverizing device, can shorten the crushing speed from 10 minutes to 1 minute and increase the energy utilization rate from 10% to 50%. Compared with magnetic pulverizing devices for dry micronization of wood fibers, the crushing efficiency is shortened from 2 minutes to 1 minute. The energy utilization rate of the electromagnetic energy used in crushing is increased from 50% to 70%.

[0027] 2. The adaptive air supply adjustment scheme proposed in the present invention, in conjunction with a laser particle size analyzer, obtains real-time changes in particle size distribution based on the crushing efficiency of wood fibers from different sources, thereby adjusting the optimal air supply for each particle size distribution segment to prevent the wood fibers from adhering to the wall and achieve efficient crushing. Moreover, only one particle size change monitoring is required to obtain the general particle size distribution change of the wood fibers from that source; at the same time, the particle size distribution change pattern is also applicable to wood fibers of the same hardness but from different sources.

[0028] 3. The production tower layout proposed in the present invention is evenly and symmetrically arranged on the closed annular crushing cavity. The number of towers is selected according to actual processing and production needs, so that the wood fibers can be more easily kept in a uniform suspension state in the annular crushing cavity during crushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 This is a schematic diagram of the overall structure of the breathing device for magnetically crushing wood fibers proposed by the present invention;

[0031] Figure 2 It is a front view of the breathing device for magnetic pulverization of wood fibers;

[0032] Figure 3 It is a top view of the breathing device for magnetically crushing wood fibers;

[0033] Figure 4 It is a side view of a breathing apparatus for magnetic pulverization of wood fibers;

[0034] Figure 5 This is a schematic diagram of the overall structure of the cylindrical valve core of the feeding port of the breathing device for magnetic crushing of wood fibers;

[0035] Figure 6 This is a schematic diagram of the overall structure of the cylindrical valve port of the feeding port of the breathing device for magnetic crushing of wood fibers;

[0036] Figure 7 It is a schematic diagram of the overall structure of the symmetrical breathing device of the wood fiber magnetic crushing device;

[0037] Figure 8 It is a top view of the symmetrical breathing device of the wood fiber magnetic crushing device;

[0038] Figure 9 It is a schematic diagram of the overall structure of the uniformly distributed breathing device of the wood fiber magnetic crushing device;

[0039] Figure 10It is a top view of the uniformly distributed breathing device of the wood fiber magnetic crushing device;

[0040] In the figure: 1. annular crushing cavity, 2. rising pipe section 1, 3. electric three-way ball valve for breathing port, 4. rising pipe section 2, 5. static eliminator, 6. electric three-way ball valve for separation port, 7. feed pipe, 8. electric three-way cylindrical valve for feed port, 9. motor, 10. separation pipe, 11. two-position five-way single-control solenoid valve, 12. upper breathing pipe, 13. upper breathing port solenoid valve connecting elbow, 14. lower breathing port solenoid valve connecting elbow, 15. annular photoelectric gate, 16. lower breathing pipe, 17. air pipe conversion head, 18. air storage device support frame, 19. air storage device, 20. air storage device connecting pipe, 21. secondary pressure reducing valve, 22. secondary pressure reducing valve connecting pipe, 23. static eliminator, 24. discharge pipe, 25. collecting device, 26. static eliminator, 27. valve core of the electric three-way cylindrical valve for feed port, 28. valve port of the electric three-way cylindrical valve for feed port. DETAILED DESCRIPTION

[0041] 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.

[0042] 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;

[0043] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0044] Explanation of terms: The terms "install", "connect", "connect", "fix" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0045] 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 due to the presence of lignin, huge energy needs to be consumed in the process of wood fiber micronization. When preparing micronized wood fiber powder by mechanical method, a mechanical grinder with a higher rotation speed is required. A large amount of heat is generated 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 production tower of the magnetic crushing device for the existing wood fiber micronization dry processing, breaking through the problem of uneven dispersion and aggregation of wood fibers in the processing process of existing professional supporting equipment. The present invention discloses a breathing device and method for wood fiber micronization dry processing, which can maintain a more uniform dispersion of wood fibers in the crushing device.

[0046] This embodiment specifically discloses a breathing device and method for magnetic crushing of wood fibers, which is suitable for magnetic crushing devices for dry processing of wood fibers, greatly improves the efficiency of micronization of wood fiber powder, and has good practical utility and engineering application value; wherein, the breathing device for magnetic crushing of wood fibers is as follows Figure 1 As shown, continuous breathing, replaceable device parts, and automatic loading and unloading can be achieved.

[0047] The breathing device is composed of multiple electrically controlled valves, which enable the wood fibers to perform different tasks when the valve core positions are combined, thereby achieving integrated control of feeding, exhalation, blowing, and separation, until the input wood fibers are completely micronized to meet production requirements. The feeding device is controlled by a multi-bin electrically controlled cylindrical valve, realizing single-time filling and batch feeding. The wind force of the upper and lower breathing ports is controlled by a two-stage pressure reducing valve, and the alternating operation of exhalation and inhalation is achieved through continuous instructions, ensuring that all wood fibers are always suspended in the annular closed pulverization cavity for micronization and nano-pulverization. When the wood fiber powder reaches a certain particle size, the upper breathing port stops working, while the lower breathing port continues working, blowing the micronized wood fiber powder into the separation tube and then into the collection device to complete the pulverization. This device greatly improves the production efficiency and micronization level of the magnetic pulverization device for dry micronization of wood fibers, and reduces its production energy consumption.

[0048] The above-mentioned breathing device and method for magnetic pulverization of wood fibers solve the problems of uneven dispersion and aggregation of wood fibers during the current magnetic pulverization device for dry micro-nano-processing of wood fibers. This device maintains a more uniform dispersion of wood fibers within the pulverization device, greatly improving the production efficiency and degree of micro-nano-processing of wood fiber micro-nano-powders while reducing energy consumption. This device is applicable to the micro-nano-powder processing of various products.

[0049] The breathing device and method for magnetic pulverization of wood fibers proposed by the present invention are described in detail below with reference to the accompanying drawings:

[0050] Example 1

[0051] First, the breathing device for magnetically crushing wood fiber disclosed in this embodiment is as follows Figure 1 As shown, it is installed outside the closed annular crushing cavity in the uniformly distributed large-diameter magnetic crushing equipment; the closed annular crushing cavity is filled with wood fibers and conductive particles, and the conductive particles can quickly make circular motions in the cavity and cause the wood fiber powder to collide, thereby realizing the Wiener crushing of the wood fibers; circular upper and lower breathing ports are arranged on the closed annular crushing cavity, and the wood fibers float between the upper and lower breathing ports under the action of the breathing system.

[0052] Specifically, the breathing device includes a gas storage device 19, a gas control valve, a feeding device, a material collecting device, a control device and related pipelines;

[0053] Specifically, the device for realizing the breathing function mainly consists of an air storage device 19, an air storage device connecting pipe 20, a secondary pressure reducing valve 21, a secondary pressure reducing valve connecting pipe 22, a two-position five-way single-control solenoid valve 11, an upper respiratory port solenoid valve connecting elbow 13, a trachea conversion head 17, an upper respiratory tube 12, an electric three-way ball valve 3 for the respiratory port, a section of the rising pipe 2, a lower respiratory port solenoid valve connecting elbow 14, and a lower respiratory tube 16; wherein, the air outlet of the air storage device 19 is connected to the air storage device connecting pipe 20, a secondary pressure reducing valve 21 is connected to the air storage device connecting pipe 20, the secondary pressure reducing valve 21 is connected to the secondary pressure reducing valve connecting pipe 22, the secondary pressure reducing valve connecting pipe 22 is connected to the inlet of the two-position five-way single-control solenoid valve 11, and the two-position five-way single-control solenoid valve 11 is connected to the inlet of the two-position five-way single-control solenoid valve 11. The outlets are respectively connected to the upper respiratory port solenoid valve connecting elbow 13 and the lower respiratory port solenoid valve connecting elbow 14; the upper respiratory port solenoid valve connecting elbow 13 is connected to the upper respiratory tube 12, and the lower respiratory port solenoid valve connecting elbow 14 is connected to the trachea conversion head 17; the trachea conversion head 17 is connected to the lower respiratory tube 16; the internal pressure and output pressure of the gas storage device 19 are controlled by the secondary pressure reducing valve 21, so as to monitor the internal pressure of the gas storage device 19 in real time to ensure the normal and stable operation of the breathing work and the constant output pressure of each breath; the input and output states of the upper respiratory port solenoid valve connecting elbow 13, the upper respiratory tube 12 and the lower respiratory port solenoid valve connecting elbow 14, and the lower respiratory tube 16 are controlled by the two-position five-way single-control solenoid valve 11 to realize continuous alternation of breathing. The air storage device is controlled by the secondary pressure reducing valve 21 to maintain a constant air pressure when exhaling, thereby ensuring the stability and controllability of each breathing process. The two air outlets on the breathing device, the upper air outlet works to realize "exhalation" and the lower air outlet works to realize "inhalation", so that the wood fiber particles remain suspended in the crushing cavity. After crushing is completed, the lower air outlet of the breathing device works to drive the crushed wood fibers to the separation tube and fall into the collection device.

[0054] Furthermore, an air pressure sensor may be provided in the air storage device and connected to the control system to implement negative feedback control so as to monitor the air pressure in the air storage device to maintain a constant level.

[0055] Furthermore, the opening and closing of the two air outlets of the breathing device are controlled by a two-position five-way single-control solenoid valve, and the working states are mutually exclusive.

[0056] Furthermore, photoelectric detection devices are provided at the two air outlets of the breathing device to detect whether wood fibers pass through and provide feedback for starting and shutting down the breathing device.

[0057] Furthermore, the breathing apparatus adopts continuous command controlled ventilation (CMV) as the air supply mode, thereby achieving continuity of breathing.

[0058] Furthermore, a laser diffraction instrument is set in the annular crushing cavity to monitor the particle size of the wood fiber in real time, and the optimal air supply volume for keeping the wood fiber in suspension at the particle size distribution is adaptively adjusted.

[0059] Furthermore, the adaptive air supply adjustment scheme can determine the approximate change in particle size distribution according to the crushing efficiency of wood fibers from different sources during pre-production.

[0060] Furthermore, the feeding device includes, connected from bottom to top, a riser section 2, a breathing port electric three-way ball valve 3, a riser section 2 4, a separation port electric three-way ball valve 6, a feeding pipe 7, a feed port electric three-way cylindrical valve 8, and a motor 9; the material collecting device includes a discharge pipe 24 and a collecting device 25; the discharge pipe 24 is connected to the riser section 2 4 and the collecting device 25 through the separation port electric three-way ball valve 6;

[0061] Furthermore, an annular photoelectric gate 15 is arranged at the upper and lower breathing ports of the closed annular pulverizing cavity 1; the upper breathing port is an upper annular photoelectric gate 15, and the lower breathing port is a lower annular photoelectric gate 15; the two annular photoelectric gates 15 are used to monitor whether wood fibers enter the riser section 2 and the lower breathing pipe 16;

[0062] Specifically, the working process is as follows:

[0063] When the upper annular photoelectric gate 15 and the lower annular photoelectric gate 15 do not detect any signal, the breathing device does not work;

[0064] When the upper annular photoelectric gate 15 detects that wood fibers have entered the first section 2 of the ascending pipe, the two-position five-way single-control solenoid valve 11 controls the upper breathing tube 12 to input gas into the closed annular crushing cavity 1, and the lower breathing port outputs gas from the closed annular crushing cavity 1, thus realizing the "exhalation" of the breathing device;

[0065] When the lower annular photoelectric gate 15 detects that wood fibers have entered the lower breathing tube 16, the two-position five-way single-control solenoid valve 11 controls the lower breathing tube 16 to input gas into the closed annular crushing cavity 1, and the upper breathing tube 12 outputs gas from the closed annular crushing cavity 1; the breathing device "inhales" air, thereby achieving continuous alternating operation of the breathing device, ensuring that the wood fibers are always suspended in the closed annular crushing cavity 1.

[0066] Furthermore, when the device is in the micro-nano crushing process, the breathing port electric three-way ball valve 3 is controlled by the motor to be in the upper closed, lower open, and right open states, ensuring that unprocessed wood fibers will not enter the device above the breathing port electric three-way ball valve 3.

[0067] Furthermore, when the laser diffractometer in the pre-production debugging stage detects that the degree of micronization reaches the production standard, the electric three-way ball valve 3 at the breathing port is controlled by the motor to be in the upper open, lower open, and right closed state, ensuring that the processed micronized wood fibers will not enter the device to the right of the electric three-way ball valve 3 at the breathing port; at this time, the electric three-way ball valve 6 at the separation port is controlled by the motor to be in the upper closed, lower open, and right open state, ensuring that the processed micronized wood fibers enter the separation pipe 10 through the second section of the riser 4, and continue to enter the collection device 25 through the discharge pipe 24; in this working state, the lower breathing pipe 12 is controlled by the two-position five-way single-control solenoid valve 11 to input gas into the closed annular crushing cavity 1, and the micronized wood fibers are blown into the collection device according to the above-mentioned working method, completing the collection process after micronization.

[0068] Furthermore, before the start of the breathing process, the separation port electric three-way ball valve 6 is controlled by a motor to be in an upper open, lower open, and right closed state, and the breathing port electric three-way ball valve 3 is controlled by a motor to be in an upper open, lower open, and right closed state, connecting the feed pipe 7, the second section of the riser 4, and the first section of the riser 2, that is, the passage for the wood fiber to enter the closed annular crushing cavity 1; the internal structure of the feed port electric three-way cylindrical valve 8 is as follows Figure 5 、 Figure 6 As shown, the structure is a multi-bin, single-channel design. The inlet electric three-way cylindrical valve core 27 is configured to have several equal chambers according to production requirements, with one chamber in a closed state. This ensures that the valve core 27 and the valve port 28 of the inlet electric three-way cylindrical valve are in a normally closed operating state, i.e., the initial state. When the unloading process begins, the motor 9 controls the rotation of the inlet electric three-way cylindrical valve core 27, aligning the chamber of the valve core 27 containing the wood fiber to be processed with the valve port 28, thereby transitioning the valve core 27 from the normally closed state to the unloading state. The wood fiber falls by gravity into the closed annular pulverizing cavity 1.

[0069] Furthermore, in the radial direction of the second section of the riser 4, the separation tube 10 and the collecting device 26 of this embodiment, the static eliminator 5, the static eliminator 23 and the static eliminator 26 are evenly arranged. The static eliminator performs high-voltage discharge at the tip from time to time to eliminate the static electricity of the wood fiber material adhering to the second section of the riser 4, the separation tube 10 and the collecting device 26, so that the wood fiber material can be better crushed. At the same time, it prevents the problem of excessive wood fiber material making it difficult to reduce the temperature and low material yield. The three static eliminators adjust the strength of the working state according to the size of the diameter of the arrangement position.

[0070] Furthermore, the static eliminator 5, the static eliminator 23, and the static eliminator 26 use existing air source DC electronic wind rods.

[0071] Furthermore, the wall thickness of the closed annular crushing cavity 1 is 10-20 mm.

[0072] Furthermore, the above-mentioned closed annular crushing cavity is made of high-quality carbon steel, such as No. 45 carbon steel, 40Cr carbon steel, No. 60 carbon steel, etc., but is not limited to the above three types of carbon steel.

[0073] Furthermore, the above-mentioned riser section 1 2, riser section 2 4, feed pipe 7, separation pipe 10, upper breathing pipe 12, upper breathing port solenoid valve connecting elbow 13, lower breathing port solenoid valve connecting elbow 14, lower breathing pipe 16, air pipe conversion head 17, gas storage device connecting pipe 20, discharge pipe 24, and collection device 25 are made of Q235 carbon steel with good plasticity.

[0074] Furthermore, the wall thickness of the above-mentioned pipe is 5-10 mm, and the wall thickness of the collecting device 25 is 10-20 mm.

[0075] Furthermore, the gas storage device 19 is made of No. 20 carbon steel with high strength, strong pressure resistance and low manufacturing cost, and the anti-corrosion coating is selected independently according to whether the use environment is corrosive.

[0076] Furthermore, the above-mentioned breathing port electric three-way ball valve 3, separation port electric three-way ball valve 6, and feed port electric three-way cylindrical valve 8 are selected according to the materials given in the national standards.

[0077] Furthermore, the above-mentioned two-position five-way single-control solenoid valve 11 and two-stage pressure reducing valve 21 are selected according to specific specifications in accordance with national standards or industry standards.

[0078] Furthermore, the gas storage device support frame 18 is made of cast iron to reduce manufacturing costs.

[0079] Furthermore, the components not mentioned above are made of high-quality carbon steel, such as No. 20 carbon steel, but not limited to No. 20 carbon steel.

[0080] Example 2

[0081] This embodiment, based on the above embodiment 1, discloses the detailed structure of a symmetrical breathing device for a magnetic pulverization device for micro-nano dry processing of wood fibers, such as Figure 7 、 Figure 8 As shown, the breathing system disclosed in Example 1 is symmetrically arranged in the symmetrical breathing device. Through the symmetrical arrangement, the wood fibers are kept more evenly dispersed in the closed annular crushing cavity.

[0082] Specifically, the structural arrangement, working mode and material selection of the symmetrical breathing device are exactly the same as those in Example 1.

[0083] Example 3

[0084] This embodiment, based on the above-mentioned embodiment 1 and embodiment 2, discloses the detailed structure of a uniformly distributed breathing device of a magnetic pulverization device for micro-nano dry processing of wood fibers, such as Figure 9 、 Figure 10 As shown, the breathing system disclosed in Example 1 is evenly arranged in the uniformly distributed breathing device, and each individual breathing system is connected by a uniformly distributed pipe 29, so that the wood fibers can be more evenly dispersed in the closed annular crushing cavity.

[0085] Specifically, the components of the uniformly distributed breathing device that are the same as those in Example 1 are consistent with the components in Example 1.

[0086] Specifically, the uniformly distributed pipe 29 of the uniformly distributed breathing device is filled with isobaric gas through the secondary pressure reducing valve 30. Each breathing system works independently, and exhalation and inhalation form independent systems without interfering with each other.

[0087] Furthermore, compared with the symmetrical breathing device in Example 2, the uniformly distributed breathing device saves layout space and cost, and multiple breathing systems can work simultaneously with one air storage device.

[0088] It should be noted that this breathing device is not limited to systems for crushing wood fibers. Using the same breathing principle, it can also be used to crush other substances, which is also within the scope of protection of this patent.

Claims

1. A breathing device for magnetic pulverization of wood fibers, characterized in that: It includes a gas storage device, a gas control valve, a feeding device, a material collecting device and a control device; The gas storage device is connected to the inlet of the gas control valve, the first outlet of the gas control valve is connected to the upper breathing tube, and the upper breathing tube is connected to the upper breathing port of the closed annular crushing cavity of the magnetic crushing device; and the upper breathing port is also connected to the feeding device and the material collecting device; The second outlet of the gas control valve is connected to the lower breathing tube, and the lower breathing tube is connected to the lower breathing port of the closed annular pulverizing cavity of the magnetic pulverizing device; The control device controls the gas inlet and outlet of the first outlet and the second outlet so that the wood fibers in the closed annular crushing cavity remain in a suspended state; 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 device, and the first riser pipe section and the second riser pipe section are connected via a first three-way valve; and the first three-way valve is also connected to the upper breathing pipe; The material collecting device includes a discharge pipe and a collecting device; the discharge pipe is connected to the second section of the rising pipe and the collecting device; The top of the second section of the rising pipe is connected to the feed pipe through a second three-way valve; the second three-way valve is also connected to the discharge pipe.

2. The breathing device for magnetically crushing wood fibers according to claim 1, characterized in that: The lower breathing port and the upper breathing port are both provided with induction switches for sensing whether wood fibers have entered the upper breathing tube or the lower breathing tube.

3. The breathing device for magnetically crushing wood fibers according to claim 1, characterized in that: The outlet of the gas storage device is provided with a pressure reducing valve, and an air pressure sensor is provided inside the gas storage device.

4. The breathing device for magnetically crushing wood fibers as claimed in claim 1, characterized in that: The control device controls the air supply of the air storage device according to the particle size of the wood fibers.

5. The breathing device for magnetically crushing wood fibers as claimed in claim 1, characterized in that: The control device is also connected to a laser particle size analyzer located in the annular crushing cavity.

6. The breathing device for magnetically crushing wood fibers as claimed in claim 1, characterized in that: Static eliminators are arranged on the feeding device and the material collecting device.

7. A method for using the breathing device for magnetically crushing wood fibers according to any one of claims 1 to 6; characterized in that: When wood fibers are detected entering the upper respiratory tube, the first outlet inputs gas into the closed annular crushing cavity; the second outlet sucks gas out of the closed annular crushing cavity; When wood fibers are detected entering the lower breathing tube, the first outlet sucks out gas from the closed annular pulverizing cavity; The second outlet inputs gas into the closed annular crushing cavity; through the alternating breathing of the first outlet and the second outlet, the wood fiber particles are kept in a suspended state in the crushing cavity; When the wood fiber powder reaches a certain particle size, the first outlet stops working and the second outlet continues to output gas, blowing the micronized wood fiber powder into the discharge pipe and then into the collection device to complete the crushing work; When it is necessary to add material into the closed annular crushing cavity, both the first outlet and the second outlet stop working and the feeding device adds material.

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