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. The breathing device comprises 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 with an inlet of the gas control valve, a first outlet of the gas control valve is connected with the upper breathing tube, and the upper breathing tube is communicated with an upper breathing opening of a closed annular crushing cavity of the magnetic crushing equipment; the upper breathing opening is further communicated with a feeding device and a material collecting device. A second outlet of the gas control device is connected with a lower breathing tube; the lower breathing tube is communicated with a lower breathing opening of the closed annular crushing cavity of the magnetic crushing equipment; and the control device enables the wood fibers in the closed annular crushing cavity to be kept in a suspension state by controlling the air in and out of 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 a magnetic crushing device for micro-nano dry processing of wood fibers. Background Art

[0002] As an important natural material, wood fiber has a wide source, large reserves, low price, environmental protection, and is renewable. It is one of the most important applicable energy sources after fossil energy such as coal, oil, and natural gas. The biggest advantage of wood fiber resources lies in the biosafety characteristics of its natural chemical composition. How to efficiently utilize wood fiber can help reduce dependence on fossil raw materials, transform it into high value-added products, and promote the sustainable development of today's society is a hot topic of current research. Due to the dense hydrogen bond network between molecules inside wood fiber, it consumes huge energy in the micro-nano process.

[0003] At present, wood fiber is gradually converted into micronized products through a series of chemical treatments, mechanical processing and other processes. The above methods require the use of a large amount of toxic chemical solvents and cannot be recycled for secondary use, and the energy consumption rate is high. Therefore, using dry processing equipment to efficiently prepare micronized wood fiber powder without using organic solvents is an urgent problem to be solved.

[0004] In the patent application with the publication number of CN 118181442 B, a magnetic crushing device, a production tower and a system for dry micro-nano processing of wood fibers are disclosed. The patent belongs to a method for dry processing of wood fibers. The crushing method used in the patent is to accelerate conductive particles by magnetic force, convert electromagnetic energy into kinetic energy of the conductive particles, and thus crush the wood fibers 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 fibers themselves to fall and return to the crushing cavity. In actual production, the gravity of the micro-nano-sized wood fibers themselves cannot counteract the equalizing pressure generated by the residual gas in the blowing scheme, so that the wood fibers are blocked from falling into the crushing cavity, resulting in low aggregation of the wood fibers in the crushing cavity, and the speed of falling by their own gravity is slow, and the overall efficiency of the device needs to be improved; and a large amount of wood fibers collide with the conductive particles during the crushing process, resulting in momentum conversion, so that part of the wood fibers overflow from the open crushing cavity, and cannot be efficiently and continuously crushed by the conductive particles in micro-nano, and the energy utilization rate is not high. Summary of the invention

[0005] The present invention aims at 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, so that the wood fibers can maintain a more uniform dispersion 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 magnetic pulverization of 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 pulverizing cavity of the magnetic pulverizing device; and the upper breathing port is also connected to a feeding device and a 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 pulverizing cavity are kept in a suspended state.

[0011] As a further technical solution, the feeding device includes a riser section one and a riser section two; the riser section one is connected to the upper breathing port of the closed annular crushing cavity of the magnetic crushing equipment, and the riser section one and the riser section two 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 a 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 fiber.

[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 to enter the upper breathing 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 fiber is detected to enter the lower breathing tube, the first outlet sucks out the gas from the closed annular pulverizing cavity; the second outlet inputs the gas into the closed annular pulverizing cavity;

[0022] The wood fiber particles are kept suspended in the crushing cavity by 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 to the outside, 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, the first outlet and the second outlet both 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 realize that the wood fiber completes the corresponding different tasks when the valve core position is combined in different combinations, so as to achieve the integrated control of feeding, exhalation, blowing, separation (material collection), until the input wood fiber is completely micronized and meets the production requirements; wherein, the breathing device adopts a constant pressure gas storage device 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 micronized wood fiber after crushing does not fall autonomously due to the small gravity is avoided, the crushing efficiency is high, and the degree of homogenization is high. Compared with traditional mechanical cutting or mechanical grinding and crushing, the breathing device proposed in the present invention cooperates with the crushing device, which can shorten the crushing speed from 10 minutes to 1 minute, and increase the energy utilization rate from 10% to 50%; compared with the magnetic crushing device for micronized dry processing of wood fiber, the crushing efficiency is shortened from the original 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 obtains real-time particle size distribution changes according to the crushing efficiency of wood fibers from different sources in conjunction with 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, thereby efficiently achieving crushing work, and only needs to monitor the particle size changes once to obtain the general particle size distribution changes 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.

[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 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.

[0030] Figure 1 It 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 magnetic pulverization of wood fibers;

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

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

[0035] Figure 6 It is a schematic diagram of the overall structure of the cylindrical valve port of the feeding port of the breathing device for the 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 pulverizing device;

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

[0039] Fig.10It is a top view of the uniformly distributed breathing device of the wood fiber magnetic pulverizing device;

[0040] In the figure: 1. annular crushing cavity, 2. one section of rising pipe, 3. electric three-way ball valve at the breathing port, 4. two sections of rising pipe, 5. static eliminator, 6. electric three-way ball valve at the separation port, 7. feeding pipe, 8. electric three-way cylindrical valve at the feeding 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 electric three-way cylindrical valve at the feeding port, 28. valve port of electric three-way cylindrical valve at the feeding port. DETAILED DESCRIPTION

[0041] 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.

[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 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;

[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, 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.

[0044] 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.

[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 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 production tower of the existing magnetic crushing device for micronized wood fiber dry processing, breaks through the problem of uneven dispersion and aggregation of wood fibers in the processing process of existing professional supporting equipment, and discloses a breathing device and method for micronized wood fiber dry processing, so that the wood fiber maintains a more uniform dispersion in the crushing device.

[0046] This embodiment specifically discloses a breathing device and method for magnetic pulverization of wood fibers, which is suitable for magnetic pulverization 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 pulverization of wood fibers is as follows Figure 1 As shown, continuous breathing, replaceable device parts, and automatic material loading and unloading can be achieved.

[0047] The above-mentioned breathing device is composed of multiple electrically controlled valves, which can realize different corresponding tasks of wood fiber when it is in different valve core position combinations, so as to achieve integrated control of feeding, exhalation, blowing and separation, until the input wood fiber is completely micronized to meet production requirements; the feeding device is controlled by a multi-bin electrically controlled cylindrical valve to realize the working mode of single filling and batch feeding; the wind force of the upper and lower breathing ports is controlled by a secondary pressure reducing valve, and the alternating operation of exhalation and inhalation is realized through continuous instructions, so as to ensure that all wood fibers are always suspended in the annular closed crushing cavity for micronized crushing; when the wood fiber powder reaches a certain particle size, the upper breathing port stops working, and the lower breathing port continues to work, blowing the micronized wood fiber powder into the separation tube, and then into the collection device to complete the crushing work. This device greatly improves the production efficiency and micronization degree of the magnetic crushing device for micronized dry processing of wood fibers, and reduces its production energy consumption.

[0048] The above set of breathing devices and methods for magnetic pulverization of wood fibers solves the existing problems of uneven dispersion and aggregation of wood fibers in the magnetic pulverization device for dry micro-nano processing of wood fibers, so that the wood fibers can be more evenly dispersed in the crushing device, greatly improving the production efficiency and micro-nano degree of wood fiber micro-nano powder and reducing its energy consumption. This device can be used for micro-nano powder processing of different products.

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

[0050] Example 1

[0051] First, the breathing device for magnetically crushing wood fibers 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, etc.;

[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 breathing port solenoid valve connecting elbow 13, a trachea conversion head 17, an upper breathing pipe 12, a breathing port electric three-way ball valve 3, a riser section 2, a lower breathing port solenoid valve connecting elbow 14, and a lower breathing pipe 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 air storage device 19 are controlled by the secondary pressure reducing valve 21, so as to monitor the internal pressure of the air storage device 19 in real time to ensure the normal and stable operation of the breathing work and the constant output pressure of each breathing; 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 the air is discharged, 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 the 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 arranged 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 an air supply mode, thereby achieving continuity of breathing.

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

[0059] Furthermore, the above-mentioned 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] Further, the feeding device includes a first section of the rising pipe 2, a breathing port electric three-way ball valve 3, a second section of the rising pipe 4, a separation port electric three-way ball valve 6, a feeding pipe 7, a feeding port electric three-way cylindrical valve 8, and a motor 9, which are connected in sequence from bottom to top; the material collecting device includes a discharge pipe 24 and a collecting device 25; the discharge pipe 24 is connected to the second section of the rising pipe 4 and the collecting device 25 through the separation port electric three-way ball valve 6;

[0061] Furthermore, annular photoelectric gates 15 are 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 of the ascending pipe 2, the two-position five-way single-control solenoid valve 11 controls the upper breathing pipe 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, thereby 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, thereby realizing the "inhalation" of the breathing device, 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 process of micron-nano crushing, the electric three-way ball valve 3 at the breathing port is controlled by a 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 electric three-way ball valve 3 at the breathing port.

[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 an 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 an 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 pipe 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 to complete the collection process after micronization.

[0068] Furthermore, before the breathing process begins, 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, it is a multi-bin single-channel structure. The electric three-way cylindrical valve core 27 of the feed port is set to a number of equal chambers according to production requirements, and one chamber is in a closed state, ensuring that the valve core 27 and the valve port 28 of the electric three-way cylindrical valve of the feed port have a normally closed working state, that is, an initial state. When the unloading process begins, the motor 9 controls the electric three-way cylindrical valve core 27 of the feed port to rotate, aligning the chamber of the valve core 27 with the wood fiber to be processed with the valve port 28, so that it changes from the normally closed state to the unloading working state, and the wood fiber falls into the closed annular crushing cavity 1 by its own gravity.

[0069] Furthermore, in the radial direction of the second section of the riser 4, the separation tube 10 and the collecting device 26 of the present 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, and at the same time, the problem of too much wood fiber material making it difficult to reduce the temperature and the low material yield can be prevented. 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 adopt the existing air source DC electronic wind rod.

[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 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, air storage device connecting pipe 20, discharge pipe 24, and collecting device 25 are made of Q235 carbon steel with good plasticity.

[0074] Furthermore, the wall thickness of the above-mentioned pipeline 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 above-mentioned components 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 is based on the above-mentioned embodiment 1, and discloses a detailed structure of a symmetrical breathing device of a magnetic pulverizing 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 is based on the above-mentioned embodiment 1 and embodiment 2, and discloses a detailed structure of a uniformly distributed breathing device of a magnetic pulverizing device for micro-nano dry processing of wood fibers, such as Fig. 9 , Fig.10 As shown, the breathing system disclosed in Example 1 is evenly arranged in the evenly distributed breathing device, and each individual breathing system is connected by an evenly 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, and each breathing system works independently, and the exhalation and inhalation form their own 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 being used in 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 pulverizing cavity of the magnetic pulverizing device; and 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 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.

2. The breathing device for magnetically crushing wood fibers as claimed in claim 1, characterized in that: 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.

3. The breathing device for magnetically crushing wood fibers as claimed in claim 2, 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.

4. The breathing device for magnetically crushing wood fibers as claimed in claim 3, 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.

5. The breathing device for magnetically crushing wood fibers as claimed in 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 enter the upper breathing tube or the lower breathing tube.

6. The breathing device for magnetically crushing wood fibers as claimed in 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.

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

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

9. 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.

10. A method for using the breathing device for magnetically crushing wood fibers as claimed in any one of claims 1 to 9; characterized in that: When wood fibers are detected to enter the upper breathing 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 it is detected that wood fibers have entered the lower breathing tube, the first outlet sucks out the amount of gas from the closed annular pulverizing cavity; The second outlet inputs gas into the closed annular pulverizing cavity; The wood fiber particles are kept suspended in the crushing cavity by alternating breathing of the first outlet and the second outlet. When the wood fiber powder reaches a certain particle size, the first outlet stops working, and the second outlet continues to output gas to the outside, 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, the first outlet and the second outlet both stop working, and the feeding device adds material.

Images