Lithium ion battery negative electrode material processing, demagnetizing and sieving device

Abstract

The invention discloses a lithium ion battery negative electrode material processing, demagnetizing and screening device, and belongs to the technical field of lithium ion battery processing, the lithium ion battery negative electrode material processing, demagnetizing and screening device comprises a first limiting support plate, and the upper surface of the first limiting support plate is provided with a magnetic screening mechanism for screening, adsorbing and removing impurities on materials; a discharging mechanism which is used for supplying materials to the magnetic screening mechanism, conveying the materials screened by the magnetic screening mechanism and adsorbing and removing impurities to the materials screened by the magnetic screening mechanism is arranged above the first limiting supporting plate, and the discharging mechanism is fixed to the bottom of the magnetic screening mechanism; the discharging mechanism comprises a first hollow conveying pipe, and a plurality of discharging pipes are arranged at the bottom of the first hollow conveying pipe. Through mutual cooperation of multiple structures, screening, adsorption and impurity removal of a battery negative electrode material are achieved, instant cleaning of a retained material is achieved through form adjustment of the screening structure, and therefore long-term reliable use of a user on the screening device is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of lithium-ion battery processing technology, specifically relating to a demagnetizing and sieving device for processing lithium-ion battery negative electrode materials. Background Technology

[0002] A lithium-ion battery is a type of rechargeable battery that primarily relies on the movement of lithium ions between the positive and negative electrodes to function. During charging and discharging, lithium ions repeatedly insert and extract between the two electrodes. In the production and processing of lithium-ion batteries, corresponding sieving devices are used to filter and screen the negative electrode material and remove impurities using magnetic attraction.

[0003] Traditional sieving devices include a base frame, straight rods, springs, half gears, positioning structures, round rods, round plates, screws, supports, handles, magnetic rods, screens, boxes, first horizontal plates, second horizontal plates, and uprights. The advantage of this sieving device is that it can filter materials.

[0004] However, in traditional screening devices, materials are easily trapped in the mesh of the screen during use, causing frequent clogging. This requires users to frequently stop the device for maintenance, making the screening device inconvenient to use and affecting its long-term reliable use. Improvement is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a demagnetizing and sieving device for processing lithium-ion battery negative electrode materials, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a demagnetizing and sieving device for processing lithium-ion battery negative electrode materials, comprising a first limiting support plate, wherein a magnetic sieve mechanism for screening and adsorbing impurities from materials is provided on the upper surface of the first limiting support plate, and a feeding mechanism for feeding materials to the magnetic sieve mechanism, conveying materials screened by the magnetic sieve mechanism, and adsorbing impurities from materials screened by the magnetic sieve mechanism is provided above the first limiting support plate, wherein the feeding mechanism is fixed at the bottom of the magnetic sieve mechanism.

[0007] As a further aspect of the present invention: the feeding mechanism includes a first hollow feeding pipe, a plurality of discharge pipes are provided at the bottom of the first hollow feeding pipe, the discharge pipes are provided through the side wall of the first hollow feeding pipe, the discharge pipes are fixedly connected to the first hollow feeding pipe, a feeding hopper is provided above the first hollow feeding pipe, and a plurality of limiting support members for supporting the feeding hopper are provided on the upper surface of the first hollow feeding pipe.

[0008] As a further embodiment of the present invention: a second hollow conveying pipe is fixedly connected to the bottom of the hopper, and a number of first impurity removal magnetic columns are arranged inside the first hollow conveying pipe for adsorbing and removing impurities from the material. The number of first impurity removal magnetic columns are arranged in a ring array on the inner wall of the first hollow conveying pipe, and the first hollow conveying pipe and the first impurity removal magnetic columns are fixedly connected.

[0009] As a further embodiment of the present invention: the magnetic sieve mechanism includes a second limiting support plate, which is fixedly connected to a first limiting support plate. A plurality of second impurity removal magnetic columns are arranged in a ring array above the second limiting support plate. A plurality of limiting mounting plates for supporting and adjusting the position of the second impurity removal magnetic columns are spaced apart above the second limiting support plate. The second impurity removal magnetic columns are vertically arranged to the limiting mounting plates. A plurality of limiting mounting plates are spaced apart at both ends of the second impurity removal magnetic columns. A plurality of limiting adjustment through holes for accommodating the lateral movement of the second impurity removal magnetic columns are opened in a ring array on the limiting mounting plates. The limiting adjustment through holes are corresponding to the second impurity removal magnetic columns. A discharge through hole corresponding to the second hollow conveying pipe is opened in the middle of the upper surface of the limiting mounting plate.

[0010] As a further embodiment of the present invention: the upper surface of the second limiting support plate is fixedly connected to a limiting guide cover that is rotatably connected to the first hollow conveying pipe, and a number of limiting fixing rods for connecting the limiting mounting plate are arranged in a circular array above the second limiting support plate. The limiting fixing rods are set perpendicular to the limiting mounting plate, and the limiting fixing rods are set parallel to the second impurity removal magnetic column. The limiting fixing rods are fixedly connected to the limiting mounting plate.

[0011] As a further embodiment of the present invention: the limiting mounting plate is slidably connected to the feeding hopper through the feeding through hole, and the limiting mounting plate is provided with a plurality of limiting mounting through holes in a circular array corresponding to the limiting adjustment through holes. The limiting mounting through holes are opened at the end of the limiting adjustment through holes away from the feeding hopper, and the interior of the limiting mounting through holes is provided with a plurality of position adjustment components for adjusting the position of the second impurity removal magnetic column.

[0012] As a further embodiment of the present invention: one end of the position adjusting member is fixedly connected to the limiting mounting plate, the other end of the position adjusting member is fixedly connected to the second impurity removal magnetic column, a driver is provided above the second limiting support plate, and the output end of the driver is fixedly connected to a limiting transmission rod for cooperating with the limiting mounting plate to drive the second impurity removal magnetic column to rotate.

[0013] As a further embodiment of the present invention: the limiting transmission rod is fixedly connected to the limiting mounting plate, and a plurality of height adjusting components for adjusting the height of the driver are fixedly connected to the upper surface of the second limiting support plate, and the height adjusting components are fixedly connected to the driver.

[0014] As a further embodiment of the present invention: an elastic guide cover is provided above the driver for guiding and dispersing materials. The elastic guide cover is fixedly connected to the second impurity removal magnetic column and slidably connected to the limiting mounting plate.

[0015] As a further embodiment of the present invention: several elastic protective plates are provided below the feeding mechanism to provide shock absorption and anti-slip reinforcement for the first limiting support plate. The several elastic protective plates are spaced apart at both ends of the lower surface of the first limiting support plate, and the elastic protective plates are fixedly connected to the first limiting support plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a simple structure and is easy to use. During use, the interaction of multiple structures achieves the screening and magnetic removal of battery negative electrode materials. By adjusting the shape of the screening structure, the residual materials can be cleaned instantly, thereby ensuring the long-term reliable use of the screening device by the user. Secondly, by adjusting the shape of the screening structure, the present invention enables the screening device to be instantly applicable to the filtration of different types of battery negative electrode materials, making the application range of the screening device wider and worthy of promotion and use. Attached Figure Description

[0017] Figure 1 A schematic diagram of a demagnetizing and sieving device for processing lithium-ion battery anode materials;

[0018] Figure 2 This is a schematic diagram of the feeding mechanism in a demagnetizing and sieving device for processing lithium-ion battery anode materials.

[0019] Figure 3 A schematic diagram of the magnetic sieve mechanism in a demagnetizing and sieving device for processing lithium-ion battery anode materials;

[0020] Figure 4 An exploded view of the magnetic sieve mechanism in a demagnetizing and sieving device for processing lithium-ion battery anode materials;

[0021] Figure 5 A schematic diagram of the limiting mounting plate in a demagnetizing and sieving device for processing lithium-ion battery negative electrode materials;

[0022] In the diagram: 1-First limiting support plate, 2-Discharging mechanism, 3-Magnetic sieve mechanism, 4-Elastic protective plate, 20-Discharge pipe, 21-First hollow conveying pipe, 22-Second hollow conveying pipe, 23-Limiting support component, 24-Discharging hopper, 25-First impurity removal magnetic column, 30-Limiting guide cover, 31-Second limiting support plate, 32-Driver, 33-Elastic guide cover, 34-Limiting fixing rod, 35-Limiting adjustment through hole, 36-Limiting mounting plate, 37-Second impurity removal magnetic column, 38-Limiting transmission rod, 391-Height adjustment component, 392-Limiting mounting through hole, 393-Position adjustment component, 394-Discharging through hole. Detailed Implementation

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection", "linking", and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting.

[0025] Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] Please see Figure 1-Figure 5 This embodiment provides a demagnetizing and sieving device for processing lithium-ion battery negative electrode materials, including a first limiting support plate 1. The upper surface of the first limiting support plate 1 is provided with a magnetic sieve mechanism 3 for screening and adsorbing impurities from the material. Above the first limiting support plate 1 is a feeding mechanism 2 for feeding the magnetic sieve mechanism 3, conveying the material screened by the magnetic sieve mechanism 3, and adsorbing impurities from the material screened by the magnetic sieve mechanism 3. The feeding mechanism 2 is fixed to the bottom of the magnetic sieve mechanism 3. Below the feeding mechanism 2 are several elastic protective plates 4 for shock absorption and anti-slip reinforcement of the first limiting support plate 1. The elastic protective plates 4 are rubber plates or silicone plates. Several elastic protective plates 4 are spaced apart at both ends of the lower surface of the first limiting support plate 1 and are fixedly connected to the first limiting support plate 1.

[0027] Please see Figure 1 and Figure 2In one embodiment, to make the use of the feeding mechanism 2 more reliable, preferably, the feeding mechanism 2 includes a first hollow conveying pipe 21. A plurality of discharge pipes 20 are provided at the bottom of the first hollow conveying pipe 21, and the discharge pipes 20 penetrate the side wall of the first hollow conveying pipe 21. The discharge pipes 20 are fixedly connected to the first hollow conveying pipe 21. A feeding hopper 24 is provided above the first hollow conveying pipe 21, and a plurality of feeding holes for the feeding hopper are provided on the upper surface of the first hollow conveying pipe 21. 24. A limiting support 23 that provides support is provided. The limiting support 23 is an iron rod or a steel plate. The bottom of the hopper 24 is fixedly connected to a second hollow conveying pipe 22. The interior of the first hollow conveying pipe 21 is provided with several first impurity removal magnetic columns 25 for adsorbing and removing impurities from the material. The first impurity removal magnetic columns 25 are electromagnet columns. Several first impurity removal magnetic columns 25 are arranged in a ring array on the inner wall of the first hollow conveying pipe 21. The first hollow conveying pipe 21 and the first impurity removal magnetic columns 25 are fixedly connected.

[0028] In another embodiment, to enrich the functionality of the feeding mechanism 2, preferably, the feeding mechanism 2 includes a first hollow conveying pipe 21. A plurality of discharge pipes 20 are provided at the bottom of the first hollow conveying pipe 21, penetrating the side wall of the first hollow conveying pipe 21 and fixedly connected to it. A feeding hopper 24 is provided above the first hollow conveying pipe 21, and a plurality of supports for the feeding hopper 24 are provided on the upper surface of the first hollow conveying pipe 21. The electric telescopic rod provides support and facilitates height adjustment of the hopper 24 by the user. A second hollow conveying pipe 22 is fixedly connected to the bottom of the hopper 24. The interior of the first hollow conveying pipe 21 is equipped with several first impurity removal magnetic columns 25 for adsorbing and removing impurities from the material. The first impurity removal magnetic columns 25 are neodymium iron boron magnetic columns. Several first impurity removal magnetic columns 25 are arranged in a ring array on the inner wall of the first hollow conveying pipe 21. The first hollow conveying pipe 21 and the first impurity removal magnetic columns 25 are fixedly connected.

[0029] Please see Figure 1 , Figure 3 , Figure 4 and Figure 5In one embodiment, to make the magnetic sieve mechanism 3 more reliable, preferably, the magnetic sieve mechanism 3 includes a second limiting support plate 31, which is fixedly connected to the first limiting support plate 1. A plurality of second impurity-removing magnetic columns 37 are arranged in a circular array above the second limiting support plate 31. The second impurity-removing magnetic columns 37 are electromagnet columns. A plurality of limiting mounting plates 36 are spaced apart above the second limiting support plate 31 to support and adjust the position of the second impurity-removing magnetic columns 37. The second impurity-removing magnetic columns 37 are vertically positioned relative to the limiting mounting plates 36. The plurality of limiting mounting plates 36 are spaced apart on both sides of the second impurity-removing magnetic columns 37. At the end, the limiting mounting plate 36 has a ring array of several limiting adjustment through holes 35 for accommodating the second impurity removal magnetic column 37 to move laterally. The limiting adjustment through holes 35 are corresponding to the second impurity removal magnetic column 37. The upper surface of the limiting mounting plate 36 has a discharge through hole 394 corresponding to the second hollow conveying pipe 22. Above the second limiting support plate 31, there are also a ring array of several limiting fixing rods 34 for connecting the limiting mounting plate 36. The limiting fixing rods 34 are set vertically to the limiting mounting plate 36 and are set parallel to the second impurity removal magnetic column 37. The limiting fixing rods 34 are fixedly connected to the limiting mounting plate 36.

[0030] Please see Figure 3-Figure 5 In one embodiment, to enrich the function of the magnetic sieve mechanism 3, preferably, the upper surface of the second limiting support plate 31 is fixedly connected to a limiting guide cover 30 that is rotatably connected to the first hollow conveying pipe 21. The limiting mounting plate 36 is slidably connected to the feeding hopper 24 through the feeding through hole 394. The limiting mounting plate 36 has a plurality of limiting mounting through holes 392 arranged in a ring array, corresponding to the limiting adjustment through holes 35. The limiting mounting through holes 392 are opened at the end of the limiting adjustment through hole 35 away from the feeding hopper 24. The interior of 92 is provided with several position adjustment components 393 for adjusting the position of the second impurity removal magnetic column 37. The position adjustment component 393 is an electric telescopic rod. One end of the position adjustment component 393 is fixedly connected to the limiting mounting plate 36, and the other end of the position adjustment component 393 is fixedly connected to the second impurity removal magnetic column 37. A driver 32 is provided above the second limiting support plate 31. The driver 32 is an electric motor. The output end of the driver 32 is fixedly connected to a limiting transmission rod 38 for cooperating with the limiting mounting plate 36 to drive the second impurity removal magnetic column 37 to rotate.

[0031] Please see Figure 3-Figure 5In one embodiment, to enrich the function of the magnetic sieve mechanism 3, preferably, the limiting transmission rod 38 is fixedly connected to the limiting mounting plate 36, and a plurality of height adjusting components 391 for adjusting the height of the driver 32 are fixedly connected to the upper surface of the second limiting support plate 31. The height adjusting components 391 are electric telescopic rods and are fixedly connected to the driver 32. An elastic guide cover 33 for guiding and dispersing materials is provided above the driver 32. The elastic guide cover 33 is a rubber cover and is fixedly connected to the second impurity removal magnetic column 37. The elastic guide cover 33 is slidably connected to the limiting mounting plate 36.

[0032] In another embodiment, to make the magnetic sieve mechanism 3 more reliable, preferably, the magnetic sieve mechanism 3 includes a second limiting support plate 31, which is fixedly connected to the first limiting support plate 1. A plurality of second impurity-removing magnetic columns 37 are arranged in a circular array above the second limiting support plate 31. The second impurity-removing magnetic columns 37 are neodymium iron boron magnetic columns. A plurality of limiting mounting plates 36 are spaced apart above the second limiting support plate 31 to support and adjust the position of the second impurity-removing magnetic columns 37. The second impurity-removing magnetic columns 37 are vertically positioned relative to the limiting mounting plates 36, and the plurality of limiting mounting plates 36 are spaced apart from each other on the second impurity-removing magnetic columns 37. At both ends, the limiting mounting plate 36 has several limiting adjustment through holes 35 arranged in a ring array to accommodate the second impurity removal magnetic column 37 for lateral movement. The limiting adjustment through holes 35 are corresponding to the second impurity removal magnetic column 37. The upper surface of the limiting mounting plate 36 has a discharge through hole 394 corresponding to the second hollow conveying pipe 22 in the middle. Above the second limiting support plate 31, several limiting fixing rods 34 are arranged in a ring array to connect the limiting mounting plate 36. The limiting fixing rods 34 are set vertically to the limiting mounting plate 36 and are set parallel to the second impurity removal magnetic column 37. The limiting fixing rods 34 are fixedly connected to the limiting mounting plate 36.

[0033] In another embodiment, to enrich the function of the magnetic sieve mechanism 3, preferably, the upper surface of the second limiting support plate 31 is fixedly connected to a limiting guide cover 30 that is rotatably connected to the first hollow conveying pipe 21. The limiting mounting plate 36 is slidably connected to the feeding hopper 24 through the feeding through hole 394. The limiting mounting plate 36 has a plurality of limiting mounting through holes 392 arranged in a ring array, corresponding to the limiting adjustment through holes 35. The limiting mounting through holes 392 are opened at the end of the limiting adjustment through hole 35 away from the feeding hopper 24. The interior of 2 is provided with several position adjustment components 393 for adjusting the position of the second impurity removal magnetic column 37. The position adjustment component 393 is an electric hydraulic cylinder. One end of the position adjustment component 393 is fixedly connected to the limit mounting plate 36, and the other end of the position adjustment component 393 is fixedly connected to the second impurity removal magnetic column 37. A driver 32 is provided above the second limit support plate 31. The driver 32 is a pneumatic motor. The output end of the driver 32 is fixedly connected to a limit transmission rod 38 for cooperating with the limit mounting plate 36 to drive the second impurity removal magnetic column 37 to rotate.

[0034] In another embodiment, to enrich the function of the magnetic sieve mechanism 3, preferably, the limiting transmission rod 38 is fixedly connected to the limiting mounting plate 36, and a plurality of height adjusting components 391 for adjusting the height of the driver 32 are fixedly connected to the upper surface of the second limiting support plate 31. The height adjusting components 391 are cylinders and are fixedly connected to the driver 32. An elastic guide cover 33 for guiding and dispersing materials is provided above the driver 32. The elastic guide cover 33 is a silicone cover and is fixedly connected to the second impurity removal magnetic column 37. The elastic guide cover 33 is slidably connected to the limiting mounting plate 36.

[0035] The working principle and usage process of this invention: Before use, the position adjustment component 393 is extended, so that the second impurity removal magnetic columns 37 arranged in a ring array are brought together. At this time, the distance between two adjacent second impurity removal magnetic columns 37 becomes smaller, and the device can filter smaller materials. This allows the device to screen materials of different types. Select the appropriate distance between two adjacent second impurity removal magnetic columns 37 according to the screening requirements, and then stop the extension of the position adjustment component 393. Before use, the limit mounting plate 36 and the second impurity removal magnetic column 37 are driven to rotate synchronously by the driver 32.

[0036] When in use, the lithium-ion battery negative electrode material (hereinafter referred to as material) to be processed is put into the inside of the feeding hopper 24. At this time, the material falls through the second hollow conveying pipe 22 into the inside of several ring array of second impurity removal magnetic columns 37. At this time, the centrifugal force generated by the rotation of the material is used to screen the material. The material that can pass through the gap between two adjacent second impurity removal magnetic columns 37 enters the inside of the first hollow conveying pipe 21 and is discharged to the outside through the discharge pipe 20. During the discharge process, the material is further magnetically removed by the first impurity removal magnetic column 25. The material that cannot pass through the gap between two adjacent second impurity removal magnetic columns 37 remains inside the device.

[0037] Secondly, during the screening process, the power supply of the second impurity removal magnetic column 37 is turned on. At this time, the second impurity removal magnetic column 37 is energized and generates a magnetic field, so that the second impurity removal magnetic column 37 adsorbs and removes iron impurities and magnetic impurities mixed in the material while screening the material. Since the material passes through the gap between two adjacent second impurity removal magnetic columns 37 to complete the screening, all materials, including impurities, can come into contact with the second impurity removal magnetic column 37, thereby avoiding the problem of poor magnetic adsorption and impurity removal effect due to poor contact effect.

[0038] In addition, during the screening process, the height adjustment component 391 is continuously extended and contracted, so that the material on the elastic guide cover 33 is intermittently thrown up, thereby raising the height of the material for better filtration and impurity removal. When it is necessary to clean up the retained impurities, the position adjustment component 393 is contracted to increase the distance between the two adjacent second impurity removal magnetic columns 37. At this time, the material retained between the two adjacent second impurity removal magnetic columns 37 falls off instantly, so that the user can clean up the blocked material instantly and improve the user's experience of using the screening device.

[0039] Thus, through the cooperation of multiple structures, the screening and magnetic removal of battery negative electrode materials can be achieved. By adjusting the shape of the screening structure, the residual materials can be cleaned instantly, thereby ensuring the long-term reliable use of the screening device by the user. Secondly, by adjusting the shape of the screening structure, the present invention enables the screening device to be instantly adapted to the filtration of different types of battery negative electrode materials, making the application range of the screening device wider. In addition, the present invention has a simple structure and is easy to use, making it worthy of promotion and use.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A demagnetizing and sieving device for processing lithium-ion battery negative electrode materials, comprising a first limiting support plate, characterized in that: The upper surface of the first limiting support plate is provided with a magnetic sieve mechanism for screening and adsorbing impurities from the material. Above the first limiting support plate is a feeding mechanism for feeding the magnetic sieve mechanism, conveying the material screened by the magnetic sieve mechanism, and adsorbing impurities from the material screened by the magnetic sieve mechanism. The feeding mechanism is fixed to the bottom of the magnetic sieve mechanism.

2. The demagnetizing and sieving device for processing lithium-ion battery negative electrode materials according to claim 1, characterized in that: The feeding mechanism includes a first hollow feeding pipe, with several discharge pipes at the bottom of the first hollow feeding pipe. The discharge pipes pass through the side wall of the first hollow feeding pipe and are fixedly connected to the first hollow feeding pipe. A feeding hopper is provided above the first hollow feeding pipe, and several limiting support members are provided on the upper surface of the first hollow feeding pipe to support the feeding hopper.

3. The demagnetizing and sieving device for processing lithium-ion battery negative electrode materials according to claim 2, characterized in that: The bottom of the hopper is fixedly connected to a second hollow conveying pipe. The interior of the first hollow conveying pipe is provided with several first impurity removal magnetic columns for adsorbing and removing impurities from the material. The several first impurity removal magnetic columns are arranged in a ring array on the inner wall of the first hollow conveying pipe. The first hollow conveying pipe and the first impurity removal magnetic columns are fixedly connected.

4. The demagnetizing and sieving device for processing lithium-ion battery negative electrode materials according to claim 3, characterized in that: The magnetic sieve mechanism includes a second limiting support plate, which is fixedly connected to a first limiting support plate. Several second impurity removal magnetic columns are arranged in a ring array above the second limiting support plate. Several limiting mounting plates for supporting and adjusting the position of the second impurity removal magnetic columns are spaced apart above the second limiting support plate. The second impurity removal magnetic columns are vertically arranged to the limiting mounting plates. Several limiting mounting plates are spaced apart at both ends of the second impurity removal magnetic columns. Several limiting adjustment through holes for accommodating the lateral movement of the second impurity removal magnetic columns are opened in a ring array on the limiting mounting plates. The limiting adjustment through holes are corresponding to the second impurity removal magnetic columns. A discharge through hole corresponding to the second hollow conveying pipe is opened in the middle of the upper surface of the limiting mounting plate.

5. The demagnetizing and sieving device for processing lithium-ion battery negative electrode materials according to claim 4, characterized in that: The upper surface of the second limiting support plate is fixedly connected to a limiting guide cover that is rotatably connected to the first hollow conveying pipe. Above the second limiting support plate, there are also several limiting fixing rods arranged in a circular array to connect the limiting mounting plate. The limiting fixing rods are set vertically to the limiting mounting plate and are set parallel to the second impurity removal magnetic column. The limiting fixing rods are fixedly connected to the limiting mounting plate.

6. The demagnetizing and sieving device for processing lithium-ion battery negative electrode materials according to claim 5, characterized in that: The limiting mounting plate is slidably connected to the feeding hopper through the feeding through hole. The limiting mounting plate has a number of limiting mounting through holes arranged in a ring array, which are corresponding to the limiting adjustment through holes. The limiting mounting through holes are located at the end of the limiting adjustment through holes away from the feeding hopper. The inside of the limiting mounting through holes is provided with a number of position adjustment components for adjusting the position of the second impurity removal magnetic column.

7. The demagnetizing and sieving device for processing lithium-ion battery negative electrode materials according to claim 6, characterized in that: One end of the position adjusting component is fixedly connected to the limiting mounting plate, and the other end of the position adjusting component is fixedly connected to the second impurity removal magnetic column. A driver is provided above the second limiting support plate, and the output end of the driver is fixedly connected to a limiting transmission rod for cooperating with the limiting mounting plate to drive the second impurity removal magnetic column to rotate.

8. The demagnetizing and sieving device for processing lithium-ion battery negative electrode materials according to claim 7, characterized in that: The limiting transmission rod is fixedly connected to the limiting mounting plate, and several height adjustment components for adjusting the height of the driver are fixedly connected to the upper surface of the second limiting support plate. The height adjustment components are fixedly connected to the driver.

9. The demagnetizing and sieving device for processing lithium-ion battery negative electrode materials according to claim 8, characterized in that: An elastic guide cover is provided above the driver to guide and disperse the material. The elastic guide cover is fixedly connected to the second impurity removal magnetic column and slidably connected to the limiting mounting plate.

10. The demagnetizing and sieving device for processing lithium-ion battery negative electrode materials according to any one of claims 1-9, characterized in that: Below the feeding mechanism are several elastic protective plates that serve to dampen shock and reinforce the first limiting support plate. The elastic protective plates are spaced apart at both ends of the lower surface of the first limiting support plate and are fixedly connected to the first limiting support plate.

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