Jet mill breaking device

Abstract

The application discloses a jet mill crushing device, which comprises a jet mill, a cyclone separator and a material distribution module, the jet mill is provided with a feeding mechanism and / or a grading wheel, the inlet of the cyclone separator is connected with the outlet of the jet mill, the material distribution module comprises a plurality of material distribution areas; a particle size identification system and a control system, the particle size identification system is used for identifying the particle size of material particles output by the cyclone separator, the control system is used for controlling the feeding mechanism and / or the grading wheel to perform feedback adjustment according to the particle size identification result of the particle size identification system, and is used for controlling the material after particle size identification to enter into corresponding material distribution areas respectively. The jet mill crushing device provided by the application can identify the particle size of the ground material, and can perform feedback adjustment on the jet mill according to the identification result, so that the particle size of the material is stabilized, and the ground material can be classified and collected.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery technology, and in particular to an air jet mill crushing device. Background Technology

[0002] Currently, existing air jet mills suffer from low efficiency and significant lag in traditional particle size monitoring during particle crushing, which severely impacts capacity improvement. Furthermore, the lack of classification and subsequent processing of substandard materials generated during the crushing process leads to product contamination and waste, indicating room for improvement. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an air jet mill crushing device, which can reduce the generation of abnormal material particles, thereby reducing the fluctuation of crushed particle size. The device is simple and practical, ensures real-time operation, and avoids material mixing and waste.

[0004] According to an embodiment of the present invention, an air jet mill crushing device includes: an air jet mill, a cyclone separator, and a material distribution module. The air jet mill is provided with a feeding mechanism and / or a classifying wheel. The inlet of the cyclone separator is connected to the outlet of the air jet mill. The material distribution module includes multiple material distribution zones. A particle size identification system and a control system are also included. The particle size identification system is used to identify the particle size of the material particles output from the cyclone separator. The control system is used to control the feeding mechanism and / or the classifying wheel to perform feedback adjustment based on the particle size identification result of the particle size identification system, and to control the material after particle size identification to enter the corresponding material distribution zones.

[0005] According to an embodiment of the present invention, the air jet mill crushing device, by setting up a particle size recognition system and a control system, can identify the particle size of the material particles output from the cyclone separator, identify and analyze the size characteristic information of each particle, and control the material after particle size recognition to enter the corresponding distribution area for screening according to the particle size recognition result of the particle size recognition system, thereby screening out the required qualified material particles. If the actual particle size deviates too much from the set standard value, the control system can also control the feeding mechanism and / or the classifying wheel for feedback adjustment, adjust the classifying wheel frequency and feeding frequency, thereby stabilizing the particle size of the material, obtaining more qualified material, reducing the generation of abnormal material particles, achieving the effect of reducing the fluctuation of crushed particle size, and the device is simple and practical, ensuring real-time performance, avoiding material confusion and material waste.

[0006] According to some embodiments of the air jet mill crushing apparatus of the present invention, the material distribution zone includes a qualified material zone, a large particle zone, and a small particle zone, and the control system is used to control the material in the material flow pool to selectively enter the qualified material zone, the large particle zone, or the small particle zone according to the particle size recognition result of the particle size recognition system.

[0007] According to some embodiments of the air jet mill crushing apparatus of the present invention, the particle size recognition system includes a material flow pool, a shooting module and an AI recognition module. The inlet end of the material flow pool is connected to the outlet end of the cyclone separator. The shooting module is used to shoot the material in the material flow pool. The shooting module and the AI ​​recognition module are respectively electrically connected to the control system.

[0008] According to some embodiments of the air jet mill crushing apparatus of the present invention, the identified material is adapted to selectively enter the qualified material zone through a first control valve, the identified material is adapted to selectively enter the qualified material zone through a second control valve, and the identified material is adapted to selectively enter the small particle zone through a third control valve. The control system is electrically connected to the first control valve, the second control valve, and the third control valve, respectively.

[0009] According to some embodiments of the air jet mill crushing apparatus of the present invention, the control system is configured to control the material in the material flow pool to enter the qualified material zone when the deviation value between the particle size identification result and the standard particle size is within a set range; and when the deviation value between the particle size identification result and the standard particle size exceeds the set range, if the particle size identification result is greater than the standard particle size, the material is controlled to enter the large particle zone, or if the particle size identification result is less than the standard particle size, the material is controlled to enter the small particle zone.

[0010] According to some embodiments of the air jet mill crushing apparatus of the present invention, the control system, when determining the deviation value between the particle size identification result and the standard particle size determination, includes: determining D0, D2, and D3 in the actual particles. 10 D 50 D 90 D 100 The actual difference between the value and the standard value, and D0, D 10 D 50 D 90 D 100 Each of these corresponds to a qualified difference range. If any of the actual differences exceeds the corresponding qualified difference range, the material will be determined to be unqualified.

[0011] When a material is determined to be non-conforming, the control system will adjust the D value of the actual particles of the non-conforming material. 50 With standard D 50The values ​​are compared; if the value is too large, it enters the large particle region; if the value is too small, it enters the small particle region.

[0012] According to some embodiments of the air jet mill crushing apparatus of the present invention, a recovery mechanism is further included, which is connected to the large particle zone and the small particle zone respectively.

[0013] According to some embodiments of the air jet mill crushing apparatus of the present invention, the recovery mechanism includes a high-speed mixer, which is adapted to weighted mix the materials in the large particle zone and the small particle zone; wherein, the target particle size value of the feed is X, the average particle size value of the small particle zone is A1 and the weight is W1, and the average particle size value of the large particle zone is A2 and the weight is W2, satisfying: W2=|(X-A1) / (A2-X)|*W1.

[0014] According to some embodiments of the air jet mill crushing apparatus of the present invention, an additive feeding device is further included, wherein the grinding hopper of the air jet mill is connected to an air inlet pipe for grinding gas, and the additive feeding device is disposed on the air inlet pipe.

[0015] According to some embodiments of the present invention, after the additives and materials are added through the additive feeding device, the air jet mill is set to run for 30s to 60s with a classifying wheel speed of 1000r / min, a crushing pressure of 0.1MPa to 0.15MPa, a motor frequency of 16Hz to 20Hz for the feeding mechanism, and a feed flow rate of 60kg / h to 80kg / h to complete the coating action. Then the connection channel between the air jet mill and the cyclone separator is opened.

[0016] According to some embodiments of the air jet mill crushing apparatus of the present invention, the exhaust port of the cyclone separator is further connected to a collector, and the discharge port of the collector is adapted to be selectively connected to a particle size identification system.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the structure of an airflow mill crushing device according to an embodiment of the present invention.

[0020] Figure label:

[0021] Airflow mill crushing device 100,

[0022] Airflow mill 1,

[0023] Cyclone separator 2,

[0024] Qualified material area 31, large particle area 32, small particle area 33

[0025] Particle size recognition system 4, material flow pool 41, imaging module 42, light source 421, image captured 422, AI recognition module 43

[0026] First control valve 51, second control valve 52, third control valve 53, collector 6, additive feeding device 7. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] The following is for reference. Figure 1 The air jet mill crushing device 100 according to an embodiment of the present invention can reduce the generation of abnormal material particles, thereby reducing the fluctuation of crushed particle size. The device is simple and practical, ensures real-time performance, and avoids material confusion and waste.

[0031] like Figure 1 As shown, the air jet mill crushing device 100 according to an embodiment of the present invention includes: an air jet mill 1, a cyclone separator 2, a material distribution module, a particle size recognition system 4, and a control system. The air jet mill crushing device 100 of the present invention can be applied to the crushing of positive electrode materials for lithium-ion batteries, or it can also be applied to the crushing of other types of materials.

[0032] An air jet mill is a device that uses high-speed airflow to generate strong impact and friction to grind powder materials. It can be used for pulverizing and dispersing particles to produce finer, more uniform, and higher-purity materials.

[0033] The air classifier mill 1 is equipped with a feeding mechanism and a classifying wheel. The inlet of the cyclone separator 2 is connected to the outlet of the air classifier mill 1. Specifically, the feeding mechanism is used to feed materials into the air classifier mill 1 for crushing. The crushed materials then pass through the classifying wheel. Under the strong centrifugal force generated by the high-speed rotating classifying turbine, the coarse and fine materials moving with the rising airflow to the classification zone are separated. Fine particles that meet the particle size requirements enter the cyclone separator 2 through the classifying wheel. That is, fine particles that meet the particle size requirements flow out of the outlet of the air classifier mill 1 and enter the cyclone separator 2 through the inlet to be collected for further separation. Meanwhile, coarse particles that do not meet the particle size requirements can descend into the crushing zone within the air classifier mill 1 for further crushing.

[0034] The material distribution module includes multiple distribution zones, each selectively connected to the outlet of the cyclone separator 2. This can be achieved by connecting the distribution zones to the outlet of the cyclone separator 2 via pipelines and by using multiple control valves to selectively connect the corresponding distribution zones to the outlet of the cyclone separator 2. Before the material flows from the outlet of the cyclone separator 2 to the corresponding distribution zone, it undergoes particle size identification by a particle size recognition system 4, and after identification, selectively enters the corresponding distribution zone. These multiple distribution zones can hold materials of different particle sizes, including qualified and unqualified zones. The qualified and unqualified zones can also be selectively subdivided; for example, the unqualified zone can further include a large particle zone 32 and a small particle zone 33. The configuration is flexible and selectable.

[0035] Specifically, the cyclone separator 2 can separate material particles through centrifugal force during rotation, such as separating particles of different sizes after grinding by the air jet mill 1. When material particles enter the cyclone separator 2 with the airflow, they are thrown against the wall of the separator under the action of centrifugal force, and then flow out from the outlet of the cyclone separator 2 into multiple distribution zones to achieve the screening of material particles.

[0036] It should be noted that the particle size of the material can be achieved by adjusting the classifier frequency and the feeding frequency of the air classifier 1. In other words, the generation of abnormal particles can be reduced by adjusting the classifier frequency and the feeding frequency of the air classifier 1.

[0037] Furthermore, the particle size recognition system 4 is used to identify the particle size of the material particles output from the cyclone separator 2, and the control system is used to control the feeding mechanism and / or the classifying wheel to make feedback adjustments based on the particle size recognition results of the particle size recognition system 4, and to control the material after particle size recognition to enter the corresponding sorting area.

[0038] In other words, the material particles output from the cyclone separator 2 include qualified particles that can be used directly and unqualified particles that need to be processed. The particle size recognition system 4 can quickly identify the size information of the particles output from the cyclone separator 2, identify whether there is a deviation between them and the required qualified particles, and whether the deviation is within the set allowable range. If the deviation of the unqualified material is within the allowable range, the control system only controls the material after particle size recognition to enter the corresponding sorting area for further screening to separate qualified materials. If the deviation of the unqualified material exceeds the allowable error value, the control system controls the feeding frequency of the feeding mechanism and / or the classifying wheel frequency of the classifying wheel according to the particle size recognition result of the particle size recognition system 4 to perform feedback adjustment, change the particle size of the material, thereby stabilizing the particle size of the material to obtain qualified materials, reducing the generation of unqualified materials, i.e., materials with abnormal particle size, and achieving the effect of reducing the fluctuation of crushed particle size.

[0039] Therefore, the closed-loop control system composed of particle size recognition system 4 and control system can realize real-time monitoring and feedback adjustment of material particle size, reduce the generation of unqualified materials, reduce the degree of particle size fluctuation, improve the system automation level, improve crushing quality, reduce crushing process fluctuation, greatly improve production efficiency and reduce costs.

[0040] In practical design, the control system includes a control device and a classifying wheel frequency feeder controller. The particle size identification system 4 transmits the monitored particle size distribution and particle size information to the control device of the control system. The control system can calculate the direction and amplitude of particle size correction according to the pre-set correction rules. The control device sends classifying wheel motor adjustment signals and feeding frequency adjustment signals to the air classifier 1 through the classifying wheel frequency feeder controller, adjusting the speed of the classifier motor and the feeding frequency, thereby changing the particle size of the material, stably obtaining qualified material, and reducing the generation of abnormal particle size material. Furthermore, by controlling the opening of the control valves on the various pipelines connecting the distribution area and the cyclone separator, the control system allows particles of different sizes after particle size identification to be classified and enter different distribution areas, thereby achieving classified collection of materials, facilitating subsequent separate processing. For example, large and small particles can be mixed and blended for further processing to obtain blended materials with better overall performance, thus realizing the recycling of unqualified materials, meeting more processing needs, improving material utilization, and avoiding material waste.

[0041] According to an embodiment of the present invention, the air jet mill crushing device 100, by setting a particle size recognition system 4 and a control system, can identify the particle size of the material particles output from the cyclone separator 2, identify and analyze the size characteristic information of each particle, and control the material after particle size recognition to enter the corresponding sorting area for screening according to the particle size recognition result of the particle size recognition system 4, thereby screening out the required qualified material particles. If the actual particle size deviates too much from the set standard value, the control system can also control the feeding mechanism and / or the classifying wheel for feedback adjustment, adjust the classifying wheel frequency and feeding frequency, thereby stabilizing the particle size of the material, obtaining more qualified material, reducing the generation of abnormal material particles, and achieving the effect of reducing the fluctuation of crushed particle size. Moreover, the device is simple and practical, ensures real-time performance, and avoids material confusion and material waste.

[0042] In some embodiments, the material distribution area includes a qualified material area 31, a large particle area 32, and a small particle area 33. The control system is used to control the material in the material flow pool 41 to selectively enter the qualified material area 31, the large particle area 32, or the small particle area 33 according to the particle size recognition result of the particle size recognition system 4, thereby realizing the screening of qualified and unqualified materials and facilitating the subsequent processing of unqualified materials of large and small particles.

[0043] like Figure 1As shown, the material distribution area includes a qualified material area 31, a large particle area 32, and a small particle area 33. In the particle size recognition system 4, after particle size recognition, the control system can compare the particle size recognition result of the particle size recognition system 4 with the set standard target particle size, and thus determine whether it is qualified material, large particle material, or small particle material based on the comparison result, and let it enter the corresponding material area. If it is qualified material, the control system controls the material in the material flow pool 41 to enter the qualified material area 31. If it is large particle material, the control system controls the material in the material flow pool 41 to enter the large particle area 32. If it is small particle material, the control system controls the material in the material flow pool 41 to enter the small particle area 33.

[0044] In some embodiments, the particle size recognition system 4 includes a material flow pool 41, an imaging module 42, and an AI recognition module 43. The inlet end of the material flow pool 41 is connected to the outlet end of the cyclone separator 2. The imaging module 42 is used to photograph the material in the material flow pool 41. The imaging module 42 and the AI ​​recognition module 43 are electrically connected to the control system.

[0045] In other words, the material particles exiting the cyclone separator 2 can continue to enter the material flow pool 41 through the inlet. The imaging module 42 in the particle size recognition system 4 can then capture images of the flowing particles within the material flow pool 41. The imaging module 42 transmits these images to the AI ​​recognition module 43, which further analyzes and identifies the particles to obtain characteristic information for each particle. The AI ​​recognition module 43 then feeds back the analyzed particle characteristic information to the control system. Upon receiving the particle characteristic information, the control system calculates the deviation between the actual particle size and the standard particle size based on a preset particle size range. If the deviation is within the allowable range, the control system does not adjust the cyclone separator 2. If the deviation exceeds the allowable error value, the control system adjusts the cyclone separator 2, calculating the direction and magnitude of particle size correction according to pre-set correction rules. It then adjusts the frequency of the classifying wheel and the feeding frequency of the air jet mill 1 in real time to achieve feedback adjustment of the particle size, thereby changing the particle size, stably obtaining qualified material, and reducing the generation of abnormal particle size.

[0046] The material flow pool 41 is located between the outlet of the cyclone separator 2 and the inlet of each distribution zone. This allows the material flowing out of the cyclone separator 2 to be identified after passing through the material flow pool 41 and then entering the corresponding distribution zone based on the identification result. Specifically, the control system uses the AI ​​identification module 43 to identify the material, which then exits from the material flow pool 41 and enters the corresponding distribution zone to separate qualified and unqualified materials. The AI ​​identification module 43 monitors and analyzes particle size primarily by using Python-based deep learning combined with dynamic image capture code to obtain particle size information.

[0047] Specifically, such as Figure 1 As shown, the particle size recognition system 4 includes a material flow pool 41, a camera module 42, and an AI recognition module 43. The camera module 42 and the AI ​​recognition module 43 are electrically connected. The inlet end of the material pool is connected to the outlet end of the cyclone separator 2, and the outlet end of the material pool is connected to the inlet end of the distribution module. Thus, materials can enter the material pool from the cyclone separator 2. The camera module 42 and the AI ​​recognition module 43 can photograph and recognize the material particles in the material pool. The recognized materials can exit from the outlet end of the material flow pool 41 and enter multiple distribution areas for screening, separating qualified and unqualified materials.

[0048] In some embodiments, the identified material is adapted to selectively enter the large particle zone 32 via the first control valve 51, i.e., the material flow pool 41 and the large particle zone 32 are selectively connected via the first control valve 51; the identified material is adapted to selectively enter the qualified material zone 31 via the second control valve 52, i.e., the material flow pool 41 and the qualified material zone 31 are selectively connected via the second control valve 52; and the identified material is adapted to selectively enter the small particle zone 33 via the third control valve 53, i.e., the material flow pool 41 and the small particle zone 33 are selectively connected via the third control valve 53. The control system is electrically connected to the first control valve 51, the second control valve 52, and the third control valve 53, respectively.

[0049] In other words, the control system can control the opening and closing of the first control valve 51, the second control valve 52, and the third control valve 53 to achieve the screening of qualified materials, large particles, and small particles. Figure 1As shown, after the control system calculates the deviation between the actual particle size and the standard target particle size according to the preset particle size range, if the material is determined to be large particle material, the control system controls the first control valve 51 to open and the second control valve 52 and the third control valve 53 to close, so that the material can enter the large particle area 32. If the material is determined to be qualified material, the control system controls the second control valve 52 to open and the first control valve 51 and the third control valve 53 to close, so that the material can enter the qualified material area 31. If the material is determined to be small particle material, the control system controls the third control valve 53 to open and the first control valve 51 and the second control valve 52 to close, so that the material can enter the small particle area 33.

[0050] Therefore, materials can enter their respective material zones separately without mixing or affecting each other, and the classification of particles according to particle size can meet the needs of further recycling of unqualified materials.

[0051] In some embodiments, the control system is configured to control the material in the material flow pool 41 to enter the qualified material area 31 when the deviation between the particle size recognition result of the AI ​​recognition module 43 and the standard particle size is within a set range, and to control the material in the material flow pool 41 to enter the large particle area 32 when the deviation between the particle size recognition result of the AI ​​recognition module 43 and the standard particle size exceeds the set range, or to control the material in the material flow pool 41 to enter the small particle area 33 when the particle size recognition result is greater than the standard particle size.

[0052] Specifically, after receiving the particle size recognition result from the AI ​​recognition module 43, the control system calculates the deviation between the actual particle size and the standard particle size according to the preset particle size range. If the recognized actual particle size is larger than the standard particle size but the deviation is within the set allowable range, the material exits from the outlet of the material flow pool 41 and enters the qualified material area 31. If the recognized actual particle size is larger than the standard particle size but the deviation is not within the allowable range, and the recognized actual particle size is larger than the standard particle size, the material exits from the outlet of the material flow pool 41 and enters the large particle area 32. If the actual particle size is larger than the standard particle size deviation which is outside the allowable range, and the identified actual particle size is smaller than the standard particle size, then the material exits from the outlet of the material flow pool 41 and enters the small particle zone 33. This enables in-situ identification and screening of actual material particles, separating qualified materials, large particles that are too large, and small particles that are too small. This not only effectively reduces losses caused by sampling and testing, but also avoids the delays in monitoring results and material waste caused by traditional manual material delivery for testing. Furthermore, the particle size identification system 4 provides real-time online monitoring, greatly improving production efficiency.

[0053] In some embodiments, the control system, when determining the deviation value between the particle size identification result and the standard particle size determination, includes: determining D0 and D in the actual particles. 10 D 50 D 90 D 100 The actual difference between the value and the standard value, and D0, D 10 D 50 D 90 D 100 Each has a corresponding acceptable difference range. If any actual difference exceeds the corresponding acceptable difference range, the material will be judged as unqualified.

[0054] When a material is determined to be non-conforming, the control system will adjust the D value of the actual particles of the non-conforming material. 50 With standard D 50 The values ​​are compared; if the value is too large, it enters the large particle region 32; if the value is too small, it enters the small particle region 33.

[0055] Specifically, after receiving the particle size recognition result from the AI ​​recognition module 43, when the actual control system calculates the deviation between the actual particle size and the standard particle size according to the preset particle size range, the deviation determination includes determining the D0 and D1 values ​​of the actual material particles. 10 D 50 D 90 D 100 The actual difference between the value and the standard value is defined as follows: each value has a acceptable difference range; if the difference exceeds any acceptable difference range, the material is judged as unqualified. When a material is judged as unqualified, the control system will adjust the D value of the actual particle size of the unqualified material. 50 With standard D 50 The particle size is compared with the standard particle size. If the result is too large, the material enters the large particle zone 32; if the result is too small, the material enters the small particle zone 33. At the same time, if the deviation between the particle size recognition result of the AI ​​recognition module 43 and the standard particle size exceeds the set range, the control system adjusts the frequency of the classifying wheel and the feeding frequency of the air classifier 1 to reduce the generation of unqualified materials.

[0056] In some embodiments, the air jet mill crushing apparatus 100 further includes a recovery mechanism, which is connected to the large particle zone 32 and the small particle zone 33 respectively.

[0057] In other words, the outlet ends of the large particle zone 32 and the small particle zone 33 are respectively connected to the recycling mechanism so that large and small particles can enter the recycling mechanism to realize the recycling of unqualified materials. The large and small particles are collected separately, which is conducive to the next step of blending the two to obtain a blended product with higher compaction density, thereby improving the utilization rate of materials and reducing costs.

[0058] In some embodiments, the recycling mechanism includes a high-speed mixer, which is suitable for weighted mixing of materials in the large particle zone 32 and the small particle zone 33, thereby obtaining a blended product with a higher compaction density for recycling, and obtaining a qualified product with better particle size uniformity, which greatly reduces the generation of unqualified materials and improves production efficiency.

[0059] The target particle size of the feed is X, the average particle size of the small particle region 33 is A1 and the weight is W1, and the average particle size of the large particle region 32 is A2 and the weight is W2, satisfying: W2=|(X-A1) / (A2-X)|*W1. This achieves particle size weighting of large and small particles and mixes them in a certain proportion to obtain a high-performance mixed cathode material. In the actual design, the weighted mixing of large and small particles can be achieved by controlling the opening of the discharge valves of the large particle region 32 and the small particle region 33 by PLC.

[0060] Therefore, by classifying and collecting large particles and small particles, and then mixing them in a weighted ratio, a blended product with high compaction density can be obtained for recycling, greatly reducing the generation of substandard materials and improving production efficiency.

[0061] In some embodiments, the qualified material area 31, the large particle area 32, and the small particle area 33 are all set in multiple groups and distributed in a one-to-one correspondence. That is, the qualified material area 31, the large particle area 32, and the small particle area 33 can be set in two groups, three groups, or even more groups. Setting up multiple material collection areas can collect more qualified materials at the same time, realize more application scenarios, and improve production efficiency.

[0062] Specifically, such as Figure 1 As shown, the air jet mill crushing device 100 is equipped with three-component feeding zones. Each of the three feeding zones includes a qualified material zone 31, a large particle zone 32, and a small particle zone 33, and is connected to the outlet end of the material flow pool 41. Thus, the material exiting the outlet end of the material flow pool 41 can enter the three feeding zones respectively, collecting more qualified material and improving production efficiency. The qualified material zone 31 of the three feeding zones can be shared to achieve centralized collection of qualified material.

[0063] In some embodiments, the imaging module 42 includes a light source 421 and an imaging element 422, which are distributed opposite to each other on both sides of the material flow pool 41. The imaging element 422 is electrically connected to the AI ​​recognition module 43.

[0064] Specifically, such as Figure 1 As shown, the imaging module 42 includes a light source 421 and an imaging element 422, as... Figure 1As shown in the left-right direction, the light source 421 is located on the left side of the material flow pool 41, and the imaging device 422 is located on the right side of the material flow pool 41. The light source 421 can use the imaging device 422 to clearly photograph the material particles. After the imaging device 422 photographs the material in the material flow pool 41 under the illumination of the light source 421, it obtains a photo of the material particles and can transmit the photo of the material particles to the AI ​​recognition module 43. The AI ​​recognition module 43 then performs further analysis based on the photo of the material particles to obtain the particle size recognition result. In the actual design, the imaging device 422 can be selected as a CCD camera, and the light source 421 can be selected as a surface light source 421 to improve the accuracy of the shooting.

[0065] In some embodiments, the air jet mill 100 further includes an additive feeding device 7, wherein the grinding hopper of the air jet mill 1 is connected to an air inlet pipe for grinding gas, and the additive feeding device 7 is disposed on the air inlet pipe.

[0066] The material enters the grinding hopper of the air jet mill 1 under the drive of high-pressure grinding gas, and is crushed by collision in the grinding hopper. After the crushing process is completed, the additive feeding device 7 can add the corresponding additive according to the amount of material. The additive is introduced through the air pressure difference of the air inlet pipe, and the additive is made to come into uniform contact with the material and move in a fluidized state with the material to achieve uniform coating of the material. Before the coating is completed, the control valve between the air jet mill 1 and the cyclone separator 2 is in a closed state. After the material is crushed and coated, the control valve between the air jet mill 1 and the cyclone separator 2 is in a closed state, so that the crushed and coated material can enter the subsequent process.

[0067] In some embodiments, after the additives and materials are added through the additive feeding device 7, the air jet mill is set to run for 30s to 60s with a classifying wheel speed of 1000r / min, a crushing pressure of 0.1MPa to 0.15MPa, a feeding mechanism motor frequency of 16Hz to 20Hz, and a feeding flow rate of 60kg / h to 80kg / h to complete the coating action. Then the connection channel between the air jet mill and the cyclone separator is opened.

[0068] In the air jet mill 1, the grinding chamber material level and grinding air pressure largely determine the material crushing effect. The grinding chamber material level can be adjusted by regulating the feeding frequency and the classifying wheel frequency, while the grinding air velocity can be controlled by regulating the grinding air pressure and nozzle diameter. Particles collide violently under the action of high-speed airflow; therefore, the air velocity largely determines the intensity of particle crushing. By controlling the grinding chamber material level and gas flow rate, powder materials of different particle sizes can be obtained, meeting the needs of different material particle sizes.

[0069] In practical design, the specific coating steps for coating the cathode material are as follows: After adding a certain amount of material and additives to the grinding hopper of the air jet mill 1 through the additive feeding device 7, the feeding is stopped. Then, the classifier wheel of the air jet mill 1 is turned on, and the rotation speed of the classifier wheel is set to 1000 r / min. Then, the crushing pressure of the air jet mill 1 is adjusted to 0.1MPa~0.15MPa. Finally, the frequency of the motor of the feeding mechanism is set to 16Hz~20Hz, and the feeder flow rate is set to 60kg / h~80kg / h. The coating action is completed in 30s~60s. Then, the connection channel between the air jet mill and the cyclone separator is opened. Under the above parameter conditions, the low-intensity airflow can be used to increase the mixing time of the material and the additives, which can obtain a better coating effect. The bonding strength between the coating layer and the substrate is high, and the particle size distribution is uniform, thus obtaining a cathode material with good particle size and coating uniformity.

[0070] This allows for the simultaneous crushing of materials and coating with additives, simplifying the process, improving production efficiency, and reducing production costs. Furthermore, the high-speed airflow enables more uniform coating of materials and additives. It's important to note that in lithium-ion batteries, the particle size and coating uniformity of the cathode material significantly impact the finished product's capacity, electrochemical performance such as charge-discharge cycles, and physicochemical indicators like compaction density and total alkali. The performance of the cathode material directly determines the quality of the lithium-ion battery; therefore, improving the particle size and coating uniformity of the cathode material can greatly enhance the quality of lithium-ion batteries.

[0071] Furthermore, in actual design, the speed of the classifying wheel, the crushing pressure, the motor frequency of the feeding mechanism, the feed flow rate, and the running time can be flexibly adjusted and selected according to requirements to meet the actual needs of the material particle performance, and are not limited to this embodiment.

[0072] In some embodiments, the exhaust port of the cyclone separator 2 is also connected to a collector 6, the discharge port of the collector 6 being adapted to be selectively connected to the particle size identification system 4.

[0073] Specifically, such as Figure 1As shown, the exhaust port of the cyclone separator 2 is also connected to a collector 6. When the material is initially separated in the cyclone separator 2, the material entering the collector 6 is material that does not meet the separation conditions of the cyclone separator 2. The material particles obtained from the collector 6 are theoretically ultrafine powders, which may contain mixed qualified material particles. The discharge port of the collector 6 is suitable for selectively connecting to the particle size recognition system 4. That is, when the actual qualified material particles are insufficient, qualified material can still be obtained from the collector 6. Connecting the discharge port of the collector 6 to the particle size recognition system 4 allows the material coming out of the collector 6 to be identified by the particle size recognition system 4, realizing the classification and collection of large particles, small particles and qualified materials, thereby obtaining qualified materials and increasing the output of qualified materials. In actual design, the material in the collector 6 can be controlled and classified for collection by a PLC.

[0074] The air jet mill crushing device 100 of this embodiment can be used in the following way.

[0075] First, the material is screened. Specifically, after the material is crushed and passed through the cyclone separator 2, it is separated according to the preset classifier wheel frequency and feeding frequency of the air classifier 1. The outlet end of the cyclone separator 2 is connected to the collector 6 and the particle size recognition system 4, respectively. That is, the material that meets the separation conditions can enter the particle size recognition system 4 from the outlet end of the cyclone separator 2 for identification, and the material that does not meet the separation conditions can enter the collector 6 from the outlet end of the cyclone separator 2.

[0076] Then, in-situ monitoring of the material is performed. Specifically, the material entering the particle size recognition system 4 is monitored, and the camera 422 obtains particle images of the flowing material within a preset time. The AI ​​recognition module 43 identifies and analyzes the particles and obtains the characteristic information of each particle, and feeds the characteristic information back to the control system.

[0077] Among them, using the in-situ method for granularity identification testing can effectively reduce the losses caused by sampling testing, enable real-time online monitoring of granularity, reduce testing delays caused by manual sampling testing and waiting for test results.

[0078] Next, the particle size of the material is controlled. Specifically, the control system compares the particle size recognition result obtained from the AI ​​recognition module 43 with the standard particle size, thereby controlling the control valves of the material flow pool 41 and each distribution zone, so that the material enters the qualified material zone 31, the large particle zone 32, and the small particle zone 33 respectively, to achieve classified collection of materials. At the same time, the frequency of the classifying wheel and the feeding frequency of the air jet mill 1 can be adjusted to stably obtain qualified materials and reduce the generation of unqualified materials. Finally, the material is recycled. Specifically, a high-pressure mixer is used to mix and blend the materials in the large particle zone 32 and the small particle zone 33 according to particle size weighting, thereby obtaining a high-pressure compacted product and realizing the recycling of unqualified materials.

[0079] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0080] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air jet mill crushing device, characterized in that, include: The assembly includes an air jet mill, a cyclone separator, and a material distribution module. The air jet mill is equipped with a feeding mechanism and / or a classifying wheel. The inlet of the cyclone separator is connected to the outlet of the air jet mill. The material distribution module includes multiple material distribution zones, including a qualified material zone, a large particle zone, and a small particle zone. The exhaust port of the cyclone separator is also connected to a collector. The particle size identification system and control system are provided, wherein the outlet of the collector is adapted to be selectively connected to the particle size identification system, the particle size identification system is used to identify the particle size of the material particles output from the cyclone separator in an in-situ manner, and the control system is used to control the feeding mechanism and / or the classifying wheel to perform feedback adjustment based on the particle size identification result of the particle size identification system, and to control the material after particle size identification to enter the corresponding sorting area respectively. The particle size identification system includes a material flow pool, the inlet of which is connected to the outlet of the cyclone separator. The control system is used to control the material in the material flow pool to selectively enter the qualified material area, the large particle area, or the small particle area according to the particle size identification result of the particle size identification system. A recycling mechanism is connected to the large particle zone and the small particle zone respectively. The recycling mechanism includes a high-speed mixer, which is adapted to weighted mix the materials in the large particle zone and the small particle zone. Wherein, the target particle size of the feed is X, the average particle size of the small particle area is A1 and the weight is W1, and the average particle size of the large particle area is A2 and the weight is W2, satisfying: W2=|(X-A1) / (A2-X)|*W1; The control system is configured to control the material to enter the qualified material area when the deviation between the particle size identification result and the standard particle size is within a set range; Furthermore, when the deviation between the particle size identification result and the standard particle size exceeds a set range, if the particle size identification result is greater than the standard particle size, the material is controlled to enter the large particle area; or if the particle size identification result is less than the standard particle size, the material is controlled to enter the small particle area. The control system, when determining the deviation between the particle size identification result and the standard particle size determination value, includes: determining D0 and D1 in the actual particles. 10 D 50 D 90 D 100 The actual difference between the value and the standard value, and D0, D 10 D 50 D 90 D 100 Each of these corresponds to a qualified difference range. If any of the actual differences exceeds the corresponding qualified difference range, the material will be determined to be unqualified. When a material is determined to be non-conforming, the control system will adjust the D value of the actual particles of the non-conforming material. 50 With standard D 50 The values ​​are compared; if the value is too large, it enters the large particle region; if the value is too small, it enters the small particle region.

2. The air jet mill crushing device according to claim 1, characterized in that, The particle size recognition system also includes a shooting module and an AI recognition module. The shooting module is used to shoot the material in the material flow pool. The shooting module and the AI ​​recognition module are electrically connected to the control system.

3. The air jet mill crushing device according to claim 2, characterized in that, The identified material is suitable for selectively entering the large particle zone through the first control valve, the identified material is suitable for selectively entering the qualified material zone through the second control valve, and the identified material is suitable for selectively entering the small particle zone through the third control valve. The control system is electrically connected to the first control valve, the second control valve, and the third control valve, respectively.

4. The air jet mill crushing device according to claim 1, characterized in that, It also includes an additive feeding device, wherein the grinding material bin of the air jet mill is connected to an air inlet pipe for grinding gas, and the additive feeding device is located on the air inlet pipe.

5. The air jet mill crushing device according to claim 4, characterized in that, After the additives and materials are added through the additive feeding device, the air jet mill is set to run for 30 to 60 seconds with a classifying wheel speed of 1000 r / min, a crushing pressure of 0.1 MPa to 0.15 MPa, a feeding mechanism motor frequency of 16 Hz to 20 Hz, and a feeding flow rate of 60 kg / h to 80 kg / h to complete the coating action. Then the connection channel between the air jet mill and the cyclone separator is opened.

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