Jet mill for sodium ion battery positive electrode material

Abstract

The utility model relates to a jet mill for a sodium ion battery positive electrode material, which comprises a shell, a grading chamber and a jet milling chamber which are arranged up and down are formed in the internal space of the shell; at least two input ports and at least two output ports are formed in the side wall of the grading chamber, and a feeding port is formed in the lower portion of the grading chamber. The side wall of the airflow crushing chamber is provided with a plurality of mounting ports and is provided with a first high-pressure nozzle, and the bottom of the airflow crushing chamber is provided with a cleaning port and is provided with a second high-pressure nozzle; each grading assembly comprises a horizontally-arranged grading wheel and a discharging barrel, a valve is arranged at the other end of each discharging barrel, and each valve is in fluid communication through a pipeline so as to control discharging of the crushed materials. The second high-pressure nozzles raise bottom sediment materials so that the bottom sediment materials can be normally smashed, through valves arranged on the grading assemblies, when one grading assembly breaks down, the valve of the corresponding grading assembly can be closed, other grading assemblies can work normally, and normal production is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of sodium ion battery material crushing, and particularly relates to an air flow crusher for a positive electrode material of a sodium ion battery. Background Art

[0002] A fluidized bed air flow crusher is a device widely used in the field of ultrafine powder crushing. Its working principle is to mix high-speed air flow with solid particles, and achieve the crushing and dispersion of particles through collision, shearing and grinding effects. The crushed particles are screened by a classification wheel, and the particles with appropriate particle size are transported to a collector. This process involves multiple disciplinary fields such as fluid mechanics, solid mechanics and powder engineering, including the flow characteristics of gas between solid particles, the interaction of gas-solid two-phase flow, the physical properties and mechanical properties of solid particles, and the technologies of particle handling, transportation and dispersion.

[0003] In the preparation of the positive electrode material of a sodium ion battery, an air flow crusher is used to process materials. However, due to the relatively low hardness of the material particles of the polyanion positive electrode material of the sodium ion battery, when using a traditional air flow crusher, the materials are easily crushed into slag, resulting in an increase in specific surface area. This will not only reduce the solid content in the whole battery manufacturing process and deteriorate the processing performance, but also affect the cycle performance of the battery. In order to prevent excessive crushing of material particles, it is necessary to reduce the pressure of the grinding gas, but this will cause the materials to not be fully purged and collided, thus precipitating at the bottom of the grinding chamber, resulting in the need to disassemble and clean the equipment after use, increasing the inconvenience of production. In addition, when the classification wheel fails, the traditional air flow crusher needs to be shut down for maintenance, which will affect the normal operation of the entire production line. The size of the materials sorted by the classification wheel is fixed. If materials of different sizes are required, the classification wheel must be shut down and replaced, which is both time-consuming and laborious. Therefore, how to develop a new type of air flow crusher that can effectively prevent material accumulation, improve processing efficiency, and still keep the equipment running when the classification wheel fails is an urgent problem to be solved at present. Summary of the Utility Model

[0004] Aiming at the problems existing in the prior art, the purpose of the utility model is to provide an air flow crusher for a positive electrode material of a sodium ion battery, which includes a classification chamber and an air flow crushing chamber. A second high-pressure nozzle is arranged at the bottom of the air flow crushing chamber to lift the deposited materials at the bottom so that they can be normally crushed. At least two classification components are arranged side by side, and valves are arranged at the discharge ports of the classification components. When one of the classification components fails, the corresponding classification component valve can be closed, and the other classification components can still work normally without affecting normal production.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An air classifier mill for the cathode material of a sodium-ion battery, comprising: a housing, an internal space of the housing forming a classification chamber and an air classification mill chamber arranged vertically; at least two input ports and at least two output ports are respectively arranged side by side on two opposite side walls of the classification chamber, and a feed port for receiving the material to be pulverized is arranged at the lower part of the classification chamber; a plurality of mounting ports are circumferentially arranged on the side wall of the air classification mill chamber, and each mounting port is configured with a first high-pressure nozzle for injecting high-pressure gas into the air classification mill chamber to impact and pulverize the material. A cleaning port is arranged at the bottom of the air classification mill chamber, and a second high-pressure nozzle is configured on the cleaning port, wherein the second high-pressure nozzle is used to blow and lift the material accumulated at the bottom of the air classification mill chamber; at least two classification components, the classification components including a horizontally arranged classification wheel and a discharge cylinder, one end of the classification wheel is configured with a motor for driving the classification wheel to rotate, the other end of the classification wheel is inserted into the classification chamber through the input port and extends inside it, one end of the discharge cylinder is inserted through the output port and approaches the other end of the classification wheel, so as to form a certain distance between the discharge cylinder and the classification wheel, wherein a valve is configured at the other end of the discharge cylinder, and each valve is fluidly connected through a pipeline to control the discharge of the pulverized material.

[0007] Further, a coil pipe for transporting high-pressure gas is also configured outside the air classification mill chamber, the coil pipe has a high-pressure gas inlet, and the coil pipe is respectively fluidly connected with a plurality of first high-pressure nozzles.

[0008] Further, a pressure regulating valve is configured at the inlet end of the second high-pressure nozzle for regulating the pressure of the high-pressure gas.

[0009] Further, the outlet end of the second high-pressure nozzle is flush with the cleaning port.

[0010] Further, the pressure of the high-pressure gas injected by the first high-pressure nozzle is greater than the pressure of the high-pressure gas injected by the second high-pressure nozzle.

[0011] Further, the classification chamber has a structure with a square top and a round bottom, and the air classification mill chamber has a cylindrical barrel structure.

[0012] Further, the classification wheel includes a first barrel and a connecting plate fixed to one end of the first barrel. A plurality of first classification ports for receiving the pulverized material are circumferentially arranged on the first barrel at a certain interval. The connecting plate is rotatably connected with the motor, and the other end of the first barrel approaches one end of the discharge cylinder.

[0013] Further, a second cylinder is rotatably arranged outside the first cylinder. A plurality of second classification ports for receiving crushed materials are circumferentially arranged on the second cylinder at a certain interval. The second classification ports cooperate with the first classification ports to form an adjustable communication port. One end of the second cylinder is provided with a plurality of protrusions, and a plurality of grooves are arranged on the connecting plate. The protrusions are slidably sleeved in the grooves, enabling the second cylinder to rotate relative to the first cylinder to adjust the size of the communication port.

[0014] Further, the discharge cylinder includes a third cylinder and a fourth cylinder arranged coaxially. The third cylinder is used to convey the crushed materials discharged by the classification wheel. The fourth cylinder is sleeved outside the third cylinder, forming an air inlet channel between the third cylinder and the fourth cylinder. An air inlet for delivering high-pressure gas to the air inlet channel is arranged on the fourth cylinder.

[0015] Further, a support frame is further configured at the bottom of the housing. The support frame is fixedly connected to the lower part of the air flow crushing chamber. The support frame keeps the bottom of the air flow crushing chamber at a certain distance from the ground, so as to have a certain space between the housing and the ground.

[0016] The utility model has the following advantages:

[0017] 1. For the air flow crusher for the positive electrode material of sodium ion batteries of the utility model, since the particles of the positive electrode material of sodium ion batteries have low hardness and small-pressure grinding gas is required to crush them, but some particles cannot be lifted and are deposited at the bottom of the air flow crushing chamber. Therefore, a second high-pressure nozzle is configured at the bottom of the air flow crushing chamber of the utility model to blow and lift the deposited materials at the bottom so that they can be normally crushed.

[0018] 2. For the air flow crusher for the positive electrode material of sodium ion batteries of the utility model, for a single or vertical classification wheel air flow crusher, when the classification wheel fails and needs to be repaired, it is necessary to stop the machine and disassemble the machine for repair, which affects normal production. The utility model arranges at least two classification components side by side, and valves are configured at the discharge ports of the classification components. When one of the classification components fails, the corresponding valve of the classification component can be closed, and other classification components can work normally. After operating until the operation is completed, then disassemble the machine for repair. Even if a certain classification component is removed, as long as the corresponding valve is closed, other classification components can still operate normally without affecting normal production.

[0019] 3. For the air flow crusher for the positive electrode material of sodium ion batteries of the utility model, the size of the materials sorted by the traditional classification wheel is fixed. If materials of different sizes are required, it is necessary to stop the machine and replace the classification wheel, which is both time-consuming and laborious. The classification wheel of the utility model includes a first cylinder and a second cylinder sleeved outside the first cylinder. The second cylinder can rotate relative to the first cylinder to adjust the size of the communication port, that is, adjust the particle size of the materials according to actual needs without disassembly and replacement, saving time and effort. Brief Description of the Drawings

[0020] Figure 1 is a three-dimensional structural schematic diagram of the airflow crusher for the positive electrode material of the sodium-ion battery of the present utility model.

[0021] Figure 2 is a three-dimensional structural schematic diagram of another angle of the airflow crusher for the positive electrode material of the sodium-ion battery of the present utility model.

[0022] Figure 3 is a three-dimensional sectional view of the airflow crusher for the positive electrode material of the sodium-ion battery of the present utility model.

[0023] Figure 4 is a three-dimensional structural schematic diagram of the classification component of the present utility model.

[0024] Figure 5 is a three-dimensional exploded view of the classification component of the present utility model.

[0025] Figure 6 is a three-dimensional sectional view of the discharge barrel of the present utility model.

[0026] Figure 7 is a three-dimensional structural schematic diagram of the classification wheel with the second cylinder of the present utility model.

[0027] Figure 8 is a three-dimensional structural schematic diagram of the classification wheel after adjusting the size of the communication port of the present utility model.

[0028] Figure 9 is a three-dimensional exploded view of the first cylinder and the second cylinder of the classification wheel of the present utility model.

[0029] Figure 10 is a scanning electron microscope image of the present utility model with the second high-pressure nozzle configured to obtain normal pulverized materials.

[0030] Figure 11 is a scanning electron microscope image of the present utility model without the second high-pressure nozzle configured, resulting in over-pulverized materials.

[0031] Among them, 1 is the housing, 101 is the classification chamber, 101a is the input port, 101b is the output port, 101c is the feed port, 101d is the maintenance port, 102 is the pneumatic grinding chamber, 102a is the installation port, 102b is the cleaning port, 2 is the classification component, 201 is the classification wheel, 201a is the first cylinder, 201a1 is the first classification port, 201b is the connecting plate, 201b1 is the groove, 201c is the second cylinder, 201c1 is the second classification port, 201c2 is the protrusion, 201d is the communication port, 202 is the discharge cylinder, 202a is the third cylinder, 202b is the fourth cylinder, 202b1 is the air inlet, 202c is the air inlet channel, 203 is the motor, 204 is the valve, 205 is the air outlet and discharge port, 3 is the first high-pressure nozzle, 4 is the second high-pressure nozzle, 5 is the coil pipe, 501 is the high-pressure gas inlet, 6 is the pressure regulating valve, and 7 is the support frame. Detailed implementation mode

[0032] The following description is merely exemplary in nature and is in no way intended to limit the present invention, its application, or its use. It will be further understood that the terms "comprising" and / or "including" when used in this specification specify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be understood that when an element, component, and / or part is referred to as being "connected to another element, component, and / or part", it can be directly connected to the other element, component, and / or part, or intervening elements may be present. It will be understood that although the terms "first", "second", etc. may be used herein to describe various elements, components, and / or parts, these elements, components, and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, or part from another element, component, or part. Thus, the first element, component, or part discussed below may be referred to as the second element, component, or part without departing from the teachings of the present invention. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention pertains. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant art and / or the context of this specification, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0033] It should be understood that, for the purpose of clearly showing the content therein, the drawings in this article are not drawn to scale, and the same or similar reference numerals indicate the same or similar components or parts. In addition, it should be understood that any embodiments described in this application and the technical features they include can be combined with each other.

[0034] The following will further elaborate on the present utility model in conjunction with the drawings and specific embodiments.

[0035] Such as Figures 1-9As shown in the figure, an air jet mill for the cathode material of a sodium-ion battery includes: a housing 1, and an internal space of the housing 1 forms a classification chamber 101 and an air jet milling chamber 102 arranged vertically; at least two input ports 101a and at least two output ports 101b are respectively arranged side by side on two opposite side walls of the classification chamber, the input ports 101a and the output ports 101b correspond to each other, and a feed port for receiving the material to be milled is arranged at the lower part of the classification chamber 101; a plurality of mounting ports 102a are circumferentially arranged on the side wall of the air jet milling chamber 102, and each mounting port 102a is configured with a first high-pressure nozzle 3, and the first high-pressure nozzle 3 is used to spray high-pressure gas into the air jet milling chamber 102 to impact and mill the material. A cleaning port 102b is arranged at the bottom of the air jet milling chamber 102, and a second high-pressure nozzle 4 is configured on the cleaning port 102b, wherein the second high-pressure nozzle 4 is used to blow and lift the material accumulated at the bottom of the air jet milling chamber 102; at least two classification components 2, the classification component 2 includes a horizontally arranged classification wheel 201 and a discharge cylinder 202. One end of the classification wheel 201 is configured with a motor 203 for driving the classification wheel 201 to rotate. The other end of the classification wheel 201 is inserted into the classification chamber 101 through the input port 101a and extends inside it. One end of the discharge cylinder 202 is inserted through the output port 101b and approaches the other end of the classification wheel 201, so that a certain distance is formed between the discharge cylinder 202 and the classification wheel 201. Among them, a valve 204 is configured at the other end of the discharge cylinder 202, and each valve 204 is fluidly connected through a pipeline to control the discharge of the milled material. Among them, the number of input ports 101a is two, the number of output ports 101b is two, the two input ports 101a and the two output ports 101b are arranged side by side and correspond one by one, and the number of at least two classification components 2 is two. The two classification components 2 respectively penetrate between the input port 101a and the output port 101b to form a material screening channel. Of course, the number of the input port 101a, the output port 101b and the classification component 2 can be configured according to actual needs, such as three, four, six, etc. Among them, the classification chamber 101 has a structure with a square top and a round bottom. The top of the classification chamber 101 has a square cover plate, and the side of the classification chamber 101 has a side plate. The side plate extends downward from the square top at a certain angle and forms an open circular opening at the bottom. The top of the classification chamber 101 is set as a square structure to enable the classification components 2 to be arranged side by side, which is convenient for installation and can provide good stability and uniform force distribution. The circular opening formed at the bottom is joined to the air jet milling chamber 102, which helps the flow and dispersion of the material and reduces the congestion and accumulation of the material during the flow process. The air jet milling chamber 102 is a cylindrical barrel structure, and its bottom is a conical structure. The cylindrical structure helps the sprayed air flow to form an ideal swirling flow in the air jet milling chamber 102 and improves the milling efficiency.The inner walls of the classification chamber 101 and the air flow crushing chamber 102 both have ceramic layers, which can effectively prevent materials from adhering to the inner walls during the crushing process, reduce equipment wear and failures caused by material accumulation, prevent friction and wear between the materials and the inner walls of the equipment, avoid introducing foreign metal elements such as nickel, iron, zinc, copper, and chromium into the materials, and the high wear resistance and chemical corrosion resistance of the ceramic layers to adapt to long-term continuous operation. In addition, the first high-pressure nozzle 3, the second high-pressure nozzle 4, the classification assembly 2, and the air outlet and material discharge pipelines all have coatings, and the coatings are polyethylene coatings, which can effectively resist the erosion of high-pressure gas and material wear, avoid introducing foreign metal elements such as nickel, iron, zinc, copper, and chromium into the materials, and at the same time extend the service life of the equipment. Among them, the valve 204 includes, but is not limited to, butterfly valves, ball valves, and globe valves, which can precisely control the flow and pressure of materials. When one of the classification assemblies 2 fails, the valve 204 corresponding to the failed classification assembly 2 can be closed, and the other classification assemblies 2 can still work normally until the operation ends and then the machine is disassembled for repair. Even if a certain classification assembly 2 is removed, as long as the corresponding valve 204 is closed, the other classification assemblies 2 can still operate normally without affecting normal production.

[0036] As Figures 1-3 shown, a coil pipe 5 for conveying high-pressure gas is further arranged outside the air flow crushing chamber 102. The coil pipe 5 has a high-pressure gas inlet 501, and the coil pipe 5 is respectively in fluid communication with a plurality of first high-pressure nozzles 3. Among them, the coil pipe 5 is horizontally arranged around the outside of a plurality of mounting openings 102a, and the high-pressure gas can quickly and evenly pass through the coil pipe 5 and be accurately distributed into each first high-pressure nozzle 3. The high-pressure gas forms an impact force and a vortex effect in the air flow crushing chamber 102, promoting the refinement and dispersion effect of the materials. Among them, the first high-pressure nozzle 3 is threadedly connected to the mounting opening 102a.

[0037] As Figures 1-3As shown, a pressure regulating valve 6 is arranged at the inlet end of the second high-pressure nozzle 4 for regulating the pressure of the high-pressure gas. The second high-pressure nozzle 4 is threadedly connected to the cleaning port 102b. The outlet end of the second high-pressure nozzle 4 is flush with the cleaning port 102b, so that the high-pressure gas ejected from the second high-pressure nozzle 4 can directly and efficiently act on the cleaning port area at the bottom of the airflow pulverizing chamber 102. The impact force and blowing effect of the high-pressure gas can effectively lift and disperse the materials accumulated at the bottom, preventing them from solidifying or piling up due to long-term stay, thereby ensuring the full flow and pulverization of the materials in the airflow pulverizing chamber 102. The pressure of the high-pressure gas ejected by the first high-pressure nozzle 3 is greater than that of the high-pressure gas ejected by the second high-pressure nozzle 4. The first high-pressure nozzle 3 is configured to eject high-pressure gas with a higher pressure to achieve normal pulverization, mainly for the pulverization process of the materials. While the second high-pressure nozzle 4 ejects gas with a relatively lower pressure for auxiliary cleaning without affecting the airflow pulverization effect, ensuring that the materials are normally pulverized and at the same time preventing some materials from piling up at the bottom of the airflow pulverizing chamber 102 due to the relatively soft texture of the particles. This setting with different pressures is achieved through independent high-pressure gas delivery systems, and each system adjusts the pressure and supplies gas according to the specific requirements of the nozzle, ensuring the efficient coordination and precise control of the entire airflow pulverization process.

[0038] Among them, the cathode material of the sodium-ion battery is relatively brittle and has a relatively low hardness. When pulverization treatment is carried out at a relatively low air pressure, although pulverization effects can also be achieved, material deposition easily occurs at the bottom of the airflow pulverizing chamber 102. These deposited materials are difficult to discharge. Long-term accumulation will not only cause cross-contamination between batches and affect product quality, but ultimately also need to be cleaned through the bottom cleaning port 102b, directly resulting in material waste. To address this bottom deposition problem, one solution is to increase the airflow intensity, that is, to increase the air pressure. However, although high air pressure can effectively drive the deposited materials at the bottom, it will also cause excessive refinement of the materials due to too high pulverization intensity, as Figure 11 shown, which shows the electron microscope image of over-pulverized materials under high air pressure and cannot reach the ideal pulverization state. Therefore, through the second high-pressure nozzle 4 arranged at the bottom of the airflow pulverizing chamber 102, the deposited materials at the bottom can be effectively lifted and dispersed, thereby allowing normal pulverization of the materials while maintaining a relatively low air pressure, as Figure 10 shown, which shows the electron microscope image of the normally pulverized materials obtained at a relatively low air pressure after the second high-pressure nozzle 4 is configured. This not only avoids the problem of over-pulverization caused by high air pressure, but also ensures the full utilization of the bottom materials, significantly improving the pulverization efficiency and product quality.

[0039] As Figure 4 and Figure 5As shown, the classification wheel 201 includes a first cylinder body 201a and a connecting plate 201b fixed to one end of the first cylinder body 201a. A plurality of first classification ports 201a1 for receiving crushed materials are circumferentially arranged on the first cylinder body 201a at certain intervals. The connecting plate 201b is rotatably connected to the motor 203. Driven by the motor 203, the first cylinder body 201a rotates at a high speed, promoting the classification and dispersion of the materials. The other end of the first cylinder body 201a is close to one end of the discharge cylinder 202, and there is a certain distance between the first cylinder body 201a and the discharge cylinder 202 to prevent the first cylinder body 201a from accidentally touching the discharge cylinder 202 during high-speed rotation and causing damage to the equipment.

[0040] As Figures 7-9 As shown, a second cylinder body 201c is rotatably arranged outside the first cylinder body 201a. A plurality of second classification ports 201c1 for receiving crushed materials are circumferentially arranged on the second cylinder body 201c at certain intervals. The second classification ports 201c1 cooperate with the first classification ports 201a1 to form an adjustable communication port 201d. Among them, one end of the second cylinder body 201c is provided with a plurality of protrusions 201c2, and the connecting plate 201b is provided with a plurality of grooves 201b1. The protrusions 201c2 are slidably sleeved in the grooves 201b1, enabling the second cylinder body 201c to rotate relative to the first cylinder body 201a to adjust the size of the communication port 201d. Among them, by rotating the second cylinder body 201c, the overlapping area between the second classification ports 201c1 and the first classification ports 201a1 can be adjusted, thereby changing the size of the communication port 201d to obtain materials with different particle sizes. Both the first classification ports 201a1 and the second classification ports 201c1 are strip-shaped openings and have matching sizes. Among them, the sizes of the communication ports 201d formed on the classification wheels 201 in each classification component 2 can be the same or different. In the case of the same size, more crushed materials can be sorted simultaneously, improving the efficiency of crushed materials. In the case of different sizes, different valves can be controlled to obtain crushed materials with different particle sizes. Among them, the method of fixing the second cylinder body 201c after rotating to a predetermined position can be a lock nut or a bolt. A locking mechanism with a threaded fit is arranged between the second cylinder body 201c and the connecting plate 201b. After adjusting the position of the second cylinder body 201c, by rotating the lock nut or the bolt, the second cylinder body 201c can be fixed on the first cylinder body 201a; or a positioning pin. Positioning pins are arranged on the second cylinder body 201c and the connecting plate 201b for locking the second cylinder body 201c at a predetermined position. Once rotated to the predetermined position, the positioning pin will insert into the corresponding hole, thereby fixing the second cylinder body 201c.

[0041] As Figure 6As shown, the discharge cylinder 202 includes a third cylinder 202a and a fourth cylinder 202b arranged coaxially. The third cylinder 202a is used to convey the pulverized material discharged by the classification wheel 201. The fourth cylinder 202b is sleeved outside the third cylinder 202a, so that an air inlet passage 202c is formed between the third cylinder 202a and the fourth cylinder 202b. An air inlet 202b1 for conveying high-pressure gas to the air inlet passage 202c is provided on the fourth cylinder 202b. Among them, between the discharge cylinder 202 and the classification wheel 201, due to a certain distance, the material may leak back into the air flow pulverizing chamber 102 from this gap, thus affecting the pulverizing efficiency and the safety of the equipment. To prevent this situation from occurring, the high-pressure gas input through the air inlet 202b1 flows in the air inlet passage 202c and forms an air flow barrier at the gap between the discharge cylinder 202 and the classification wheel 201, effectively preventing the material from leaking and ensuring that the material advances along the predetermined flow path.

[0042] As Figures 1-3 shown, a support frame 7 is also configured at the bottom of the housing 1. The support frame 7 is fixedly connected to the lower part of the air flow pulverizing chamber 102. The support frame 7 keeps the bottom of the air flow pulverizing chamber 102 at a certain distance from the ground, so that there is a certain space between the housing 1 and the ground. This space is used to install the second high-pressure nozzle 4 and the pressure regulating valve 6, and to collect the material discharged from the cleaning port 102b.

[0043] As Figures 1-3 shown, a maintenance port is also provided at the top of the classification chamber 101. The maintenance port is used for disassembling and assembling the classification component 2 for maintenance.

[0044] The working method of the present utility model is as follows:

[0045] Air flow supply: Start the high-pressure gas supply system, and convey high-pressure gas into the coil 5 through the high-pressure gas inlet 501 on the coil 5 to form a supersonic air flow in the air flow pulverizing chamber 102;

[0046] Feeding: Open the feeding port, and feed the sodium-ion battery cathode material to be pulverized into the classification chamber 101 and then into the air flow pulverizing chamber 102 by the feeding screw or the star feeder;

[0047] Pulverizing: The material entering the air flow pulverizing chamber 102 comes into contact with the air flow and collides. Due to the impact force of the air flow and the mutual collision between the materials, the material is pulverized into smaller particles;

[0048] Classification: The crushed material enters the classification wheel 201 in the classification assembly 2 along with the air flow. Under the action of the high-speed rotation of the classification wheel 201, the material is separated according to the particle size, and the crushed material meeting the particle size requirements is obtained. Specifically, by adjusting the communication port 201d on the classification wheel 201, the crushed material meeting the particle size requirements is allowed to enter the interior of the classification wheel 201 and is conveyed to the discharge cylinder 202 along with the air flow. Controlled by the valve 204 of the discharge cylinder 202, the material meeting the particle size requirements is discharged from the air outlet and discharge port 205.

[0049] Blowing at the bottom of the air jet milling chamber 102: Use the pressure regulating valve 6 to adjust the pressure of the second high-pressure nozzle 4 to ensure that the high-pressure gas can effectively blow the material deposited at the bottom of the air jet milling chamber 102 and prevent material accumulation. At the same time, adjust the pressures of the first high-pressure nozzle 3 and the second high-pressure nozzle 4 to ensure that the pressure of the first high-pressure nozzle 3 is greater than that of the second high-pressure nozzle 4 to optimize the crushing and cleaning efficiency.

[0050] Generally speaking, for the air jet mill for the cathode material of sodium-ion batteries of the present utility model, since the particles of the cathode material of sodium-ion batteries have low hardness, a small-pressure grinding gas needs to be used to crush them. However, some particles cannot be lifted and are deposited at the bottom of the air jet milling chamber. Therefore, a second high-pressure nozzle is configured at the bottom of the air jet milling chamber of the present utility model to blow and lift the deposited material at the bottom so that it can be normally crushed. For the air jet mill for the cathode material of sodium-ion batteries of the present utility model, for a single or vertical classification wheel air jet mill, when the classification wheel fails and needs to be repaired, the machine needs to be stopped and disassembled for repair, which affects normal production. In the present utility model, at least two classification assemblies are arranged side by side, and valves are configured at the discharge ports of the classification assemblies. When one of the classification assemblies fails, the corresponding classification assembly valve can be closed, and the other classification assemblies can work normally and operate until the operation is completed and then disassembled for repair. Even if a certain classification assembly is removed, only the corresponding valve needs to be closed, and the other classification assemblies can still operate normally without affecting normal production. For the air jet mill for the cathode material of sodium-ion batteries of the present utility model, the size of the material sorted by the traditional classification wheel is fixed. If materials of different sizes need to be obtained, the classification wheel must be stopped and replaced, which is both time-consuming and laborious. The classification wheel of the present utility model includes a first cylinder body and a second cylinder body sleeved outside the first cylinder body. The second cylinder body can rotate relative to the first cylinder body to adjust the size of the communication port, that is, adjust the particle size of the material according to actual needs without disassembly and replacement, which is time-saving and labor-saving.

[0051] The above embodiments are the preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present utility model shall be equivalent replacement methods and are all included in the protection scope of the present utility model.

Claims

1. A jet mill for sodium ion battery positive electrode materials, characterized in that: include: A housing, wherein the interior space of the housing is formed with a classification chamber and an airflow crushing chamber arranged up and down; At least two input ports and at least two output ports are arranged side by side on two opposite side walls of the classification chamber, and a feed port for receiving materials to be crushed is arranged at the lower part of the classification chamber; A plurality of installation openings are circumferentially arranged on the side wall of the airflow pulverizing chamber, each of which is provided with a first high-pressure nozzle, which is used to spray high-pressure gas into the airflow pulverizing chamber to impact and pulverize the materials, and a cleaning opening is arranged at the bottom of the airflow pulverizing chamber, on which a second high-pressure nozzle is arranged, wherein the second high-pressure nozzle is used to spray and lift the materials accumulated at the bottom of the airflow pulverizing chamber; At least two grading components, the grading components include a horizontally arranged grading wheel and a discharge barrel, one end of the grading wheel is provided with a motor for driving the grading wheel to rotate, the other end of the grading wheel is inserted into the grading chamber through the input port and extends inside the grading chamber, one end of the discharge barrel is inserted into and approaches the other end of the grading wheel through the output port, so that a certain distance is formed between the discharge barrel and the grading wheel, wherein the other end of the discharge barrel is provided with a valve, and each valve is connected through a pipeline fluid to control the discharge of the crushed material.

2. The airflow pulverizer for sodium ion battery positive electrode materials according to claim 1, characterized in that: A coil for conveying high-pressure gas is also arranged outside the airflow pulverizing chamber. The coil has a high-pressure gas inlet and is respectively connected to a plurality of first high-pressure nozzle fluids.

3. The airflow pulverizer for sodium ion battery positive electrode materials according to claim 1, characterized in that: The inlet end of the second high-pressure nozzle is provided with a pressure regulating valve for regulating the pressure of the high-pressure gas.

4. The airflow pulverizer for sodium ion battery positive electrode materials according to claim 1, characterized in that: The outlet end of the second high-pressure nozzle is flush with the cleaning port.

5. The airflow pulverizer for sodium ion battery positive electrode materials according to claim 1, characterized in that: The pressure of the high-pressure gas sprayed by the first high-pressure nozzle is greater than the pressure of the high-pressure gas sprayed by the second high-pressure nozzle.

6. The airflow pulverizer for sodium ion battery positive electrode materials according to claim 1, characterized in that: The classification chamber has a square top and round bottom structure, and the air flow crushing chamber has a cylindrical barrel structure.

7. The airflow pulverizer for sodium ion battery positive electrode materials according to claim 1, characterized in that: The grading wheel includes a first cylinder and a connecting plate fixed at one end of the first cylinder. A plurality of first grading ports for receiving crushed materials are circumferentially arranged at certain intervals on the first cylinder. The connecting plate is rotatably connected to the motor. The other end of the first cylinder is close to one end of the discharge cylinder.

8. The airflow pulverizer for sodium ion battery positive electrode materials according to claim 7, characterized in that: A second cylinder is rotatably arranged on the outside of the first cylinder, and a plurality of second grading ports for receiving crushed materials are circumferentially arranged at certain intervals on the second cylinder. The second grading ports cooperate with the first grading ports to form an adjustable connecting port, wherein a plurality of protrusions are arranged at one end of the second cylinder, and a plurality of grooves are arranged on the connecting plate, and the protrusions are slidably fitted in the grooves, so that the second cylinder can rotate relative to the first cylinder to adjust the size of the connecting port.

9. The airflow pulverizer for sodium ion battery positive electrode materials according to claim 1, characterized in that: The discharge cylinder includes a third cylinder and a fourth cylinder which are coaxially arranged. The third cylinder is used to transport the crushed material discharged by the grading wheel. The fourth cylinder is mounted on the outside of the third cylinder to form an air intake channel between the third cylinder and the fourth cylinder. The fourth cylinder is provided with an air inlet for transporting high-pressure gas to the air intake channel.

10. The airflow pulverizer for sodium ion battery positive electrode materials according to claim 1, characterized in that: The bottom of the shell is also provided with a support frame, which is fixedly connected to the lower part of the airflow pulverizing chamber. The support frame enables the bottom of the airflow pulverizing chamber to be a certain distance away from the ground so as to have a certain space between the shell and the ground.

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