Graphite negative electrode material screening and magnetic removal device

Abstract

The application belongs to the technical field of battery negative electrode material processing, and particularly relates to a graphite negative electrode material screening and magnetic removing device. The device comprises a transmission box, a transmission channel and a magnetic removing device. The magnetic removing device comprises a magnetic removing box arranged on the side end of the transmission box, a channel arranged on the side wall of the transmission box, a driving structure arranged on the magnetic removing box, an electromagnetic rod connected with the driving structure and entering / leaving the transmission box through the channel, and a control structure for supplying power to the electromagnetic rod. Through the arrangement of the transmission box, the transmission channel and the magnetic removing device, the magnetic substances in the raw materials in the transmission can be quickly adsorbed, and the adsorbed magnetic substances can be taken away from the transmission position and removed by the operation of the magnetic removing device. The magnetic substances will not fall into the raw materials, so the precision requirement of the magnetic strength of the magnetic removing device is not high, and the device is easy to realize, has the advantages of strong practicability and simple operation.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery negative electrode material processing, and particularly relates to a graphite negative electrode material screening and magnetic removing device. BACKGROUND

[0002] Artificial graphite as a negative electrode material has become an ideal choice for lithium ion battery negative electrode materials due to its high energy density, high power density and low cost and other advantages. The high-capacity high-retention composite graphite material mainly comprises needle-shaped coke and petroleum coke which are crushed, shaped and granulated to obtain artificial graphite through high-temperature graphitization. The general preparation process comprises mixing various raw materials in proportion, adding a binder for coating, bonding and high-temperature carbonization to obtain carbonized products, and then crushing, screening, mixing and removing the magnetic substances to obtain the high-capacity high-retention composite graphite material product with uniform physical and chemical properties.

[0003] Among them, the magnetic removal is generally achieved by electric magnetic removal, that is, the magnetic field generated by the electrification is used to adsorb and remove the magnetic substances. The existing magnetic removal device generally sets an electrified plate on the top side of the conveying belt to adsorb and remove the magnetic substances during the transportation process. However, the existing device is fixed, and the adsorption capacity will be affected after a certain amount of impurities is adsorbed, which leads to the incomplete removal of the magnetic impurities and affects the quality of the graphite product.

[0004] The document with the application publication number CN117181444A discloses a graphite negative electrode material magnetic removal device, which comprises a supporting rod, a magnetic removal box and an electrified rod. The electrified rod is arranged in the magnetic removal box, and a discharging plate and an outlet supporting plate are arranged at the two ends of the magnetic removal box, respectively. A vibrating mechanism is arranged between the discharging plate and the outlet supporting plate. An unloading mechanism is arranged on the outer side of the electrified rod. A linkage mechanism is arranged between the electrified rod and the vibrating mechanism to drive the two to move synchronously.

[0005] The working principle of the device is as follows: the graphite in the transportation process is adsorbed by the rotation of the electrified rod, and each surface of the electrified rod can be adsorbed, replacing the traditional fixed electrified plate, so that the electrified rod can remove the adsorbed impurities on the surface through the unloading mechanism after adsorbing a certain amount of impurities, ensuring that the adsorption capacity of the electrified rod will not be affected. The reciprocating screw rod of the unloading mechanism can control the reciprocating movement of the scraper, so as to scrape the surface of the electrified rod, ensuring the adsorption efficiency of the electrified rod.

[0006] However, the device still has the following problems: the magnetic strength of the electrified rod cannot be controlled. In order to adsorb the substances, the magnetic strength needs to be strong enough, but this will also increase the difficulty of the scraper structure to scrape the adsorbed magnetic substances, and the scraped and fallen magnetic substances are also easy to fall back to the transported raw materials, resulting in an unsatisfactory removal rate of the magnetic substances. SUMMARY

[0007] In order to solve the above problems, the graphite negative material screening and magnetic removing device is provided, the transmission box, the transmission channel and the magnetic removing device are arranged, the magnetic substances in the raw materials in the transmission can be quickly adsorbed, the magnetic substances after the adsorption are taken away from the transmission position and removed by the working of the magnetic removing device, the magnetic substances cannot fall into the raw materials, the accuracy requirement of the magnetic strength of the magnetic removing device is not high, the device is easy to realize, and has the advantages of strong practicability and simple operation.

[0008] In order to achieve the above purpose, the technical scheme of the present application is as follows:

[0009] The graphite negative material screening and magnetic removing device comprises a transmission box, a transmission channel arranged in the transmission box and a magnetic removing device, the magnetic removing device comprises a magnetic removing box arranged on the side end of the transmission box, a channel arranged on the side wall of the transmission box, a driving structure arranged on the magnetic removing box, an electromagnetic rod connected with the driving structure and entering / leaving the transmission box through the channel, and a control structure for supplying power to the electromagnetic rod.

[0010] As a further preferred embodiment of the present application, the electromagnetic rod performs circumferential motion, and the electromagnetic rod rotates through the upper end of the transmission channel.

[0011] As a further preferred embodiment of the present application, the electromagnetic rod comprises a rod body and a protective sleeve arranged outside the rod body; the control structure comprises a wire wound around the outer circumferential side of the rod body and a power supply connected with the wire.

[0012] As a further preferred embodiment of the present application, the wire comprises a first connecting segment and a second connecting segment connected with two electrodes of the power supply, and two main body segments connected with the rod body; one of the main body segments is connected with the first connecting segment, the other main body segment is connected with a first conductive sheet, and the second connecting segment is connected with a second conductive sheet at the end away from the power supply; the protective sleeve comprises an inner cylinder on which the first conductive sheet is mounted, and an outer cylinder on which the second conductive sheet is mounted and which is in sliding connection with the inner cylinder; the control structure further comprises a control member for controlling the relative position of the inner cylinder and the outer cylinder.

[0013] As a further preferred embodiment of the present application, the control member comprises a supporting spring arranged on the end of the electromagnetic rod close to the inner cylinder / outer cylinder and connected with the inner wall of the inner cylinder / outer cylinder, and a pressing plate arranged on the inner wall of the magnetic removing box and used for pressing the inner cylinder / outer cylinder.

[0014] As a further preferred embodiment of the present application, the protective sleeve further comprises a track arranged on the inner wall of the outer cylinder, a sliding column arranged on the outer wall of the inner cylinder and inserted into the track; the second conductive sheet is mounted on the bottom surface of the track, the sliding column is connected with the first conductive sheet, and the sliding column is made of conductive material.

[0015] As a further preferred embodiment of the present application, the protective sleeve is provided with a circuit passage through which the first connecting segment and the second connecting segment pass.

[0016] As a further preferred embodiment of the present application, the magnetic removal box comprises a box body, a flat plate arranged in the box body and abutting against the passage, a magnetic removal port arranged at the lower end of the box body, and a guide inclined surface arranged on the inner side wall of the box body and extending to the magnetic removal port.

[0017] As a further preferred embodiment of the present application, the driving structure comprises a fixed cylinder arranged on the flat plate, a rotating shaft rotatably arranged in the fixed cylinder, a fixing block arranged on the rotating shaft and used for mounting the electromagnetic rod, and a motor arranged on the magnetic removal box and having an output shaft penetrating through the magnetic removal box and connected with the rotating shaft.

[0018] The present application further provides a method for controlling the graphite negative electrode material screening and magnetic removal device, which comprises the following steps: when the electromagnetic rod enters the magnetic removal box, the control member drives the inner cylinder / outer cylinder to slide so that the first conductive sheet and the second conductive sheet are misaligned, the main body segment is powered off, and the magnetic property of the electromagnetic rod disappears or is weakened; when the electromagnetic rod leaves the magnetic removal box, the control member drives the inner cylinder / outer cylinder to slide so that the first conductive sheet and the second conductive sheet are abutted, the main body segment is powered on, and the magnetic property of the electromagnetic rod is restored or strengthened.

[0019] The present application has the following advantages:

[0020] The magnetic removal device provided by the present application can quickly adsorb the magnetic substances in the raw materials in the transmission through the transmission box, the transmission passage and the magnetic removal equipment, and the adsorbed magnetic substances can be taken away from the transmission position and removed by the working of the magnetic removal equipment, so that the magnetic substances will not fall into the raw materials, and thus the precision requirement of the magnetic strength of the magnetic removal equipment is not high, the magnetic removal equipment is easy to realize, and has the advantages of strong practicability and simple operation.

[0021] In the magnetic removal device provided by the present application, the power supply state of the electromagnetic rod is switched according to the position of the electromagnetic rod, so that the functions of material adsorption and material discharge are finally realized, the index is clear, the control is simple, and the device has the advantages of strong economy and easy maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0022] ATTACHMENT Figure 1 Fig. 1 is a structural schematic diagram of the present application in a plan view.

[0023] Figure 2 is a schematic diagram of the internal structure of the present application in a plan view. Figure 2 Figure 3 is a schematic diagram of the internal structure of the present application in a front view.

[0024] Figure 4 is a schematic diagram of a structure of the electromagnetic rod of the present application. Figure 3 Figure 5 is a schematic diagram of the internal structure of the present application in a front view excluding the magnetic box.

[0025] Figure 4 Figure 6 is a schematic diagram of the circuit of the electromagnetic rod of the present application.

[0026] Figure 7 is a schematic diagram of the partial structure of the electromagnetic rod and control structure of the present application in a plan view. Figure 5 Figure 8 is a schematic diagram of the partial structure of the inner cylinder and outer cylinder of the present application in a plan view.

[0027] Figure 6 Figure 9 is a schematic diagram of the partial structure of the electromagnetic rod and control structure of the present application in a plan view.

[0028] Figure 10 is a schematic diagram of the partial structure of the inner cylinder and outer cylinder of the present application in a plan view. Figure 7 BRIEF DESCRIPTION OF DRAWINGS: support a, buffer support b, transmission box 1, transmission channel 2, magnetic removal device 3;

[0029] Horizontal box 11, feed inlet 12, discharge outlet 13;

[0030] Transmission belt 21, transmission roller body 22, transmission motor 23, baffle 24;

[0031] Magnetic removal box 31, channel 32, drive structure 33, electromagnetic rod 34, control structure 35;

[0032] Box body 311, flat plate 312, magnetic removal port 313, guide slope 314;

[0033] Fixed cylinder 331, rotating shaft 332, fixed block 333, motor 334;

[0034] Rod body 341, protective sleeve 342;

[0035] Inner cylinder 342a, outer cylinder 342b, track 342c, sliding column 342d, circuit channel 342e;

[0036] Wire 351, power supply 352, control member 353;

[0037] First connecting section 351a, second connecting section 351b, main body section 351c, first conductive sheet 351d, second conductive sheet 351e;

[0038] Support spring 353a, extrusion plate 353b.

[0039] DETAILED DESCRIPTION

[0040] ​​​In the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0041] In the description of the present application, it should be understood that the terms "set", "connected" and the like should be understood broadly, for example, "connected" can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] Embodiment 1

[0043] The present application provides a graphite negative material screening and magnetic removal device, which comprises a conveying box 1, a conveying channel 2 arranged in the conveying box 1 and a magnetic removal device 3.

[0044] In this embodiment, the conveying box 1 comprises a horizontal box body 11, the upper end of the horizontal box body 11 is provided with a feeding port 12 on one side, and the side end away from the horizontal box body 11 is provided with a discharging port 13. The horizontal box body 11 is installed on a support a, and the support a is also provided with a buffer support b connected with the four corner portions of the horizontal box body 11. The buffer support b can be a buffer spring.

[0045] In this embodiment, the conveying channel 2 comprises a conveying belt 21, a conveying roller body 22 and a conveying motor 23; wherein the conveying belt 21 is installed on at least two conveying roller bodies 22 rotatably installed in the horizontal box body 11, the conveying motor 23 is used to drive the conveying roller body 22 to rotate, and the conveying belt 21 moves through the synchronous rotation of the conveying roller body 22, thereby driving the material on the conveying belt to move from the feeding port 12 to the discharging port 13.

[0046] It can be understood that in order to improve the magnetic removal efficiency, the material on the conveying belt 21 needs to be spread as much as possible, so a vibration motor (not marked in the figure) for driving the conveying belt 21 to vibrate can also be installed in the horizontal box body 11; in order to avoid the material from falling off the conveying belt 21, the two side ends of the conveying belt 21 are provided with baffles 24 protruding from the upper surface of the conveying belt 21.

[0047] In the embodiment, the demagnetization device 3 comprises a demagnetization box 31 arranged on the side end of the conveying box 1, a channel 32 arranged on the side wall of the conveying box 1, a driving structure 33 arranged on the demagnetization box 31, an electromagnetic rod 34 connected with the driving structure 33 and entering / leaving the conveying box 1 through the channel 32, and a control structure 35 for supplying power to the electromagnetic rod 34.

[0048] The demagnetization box 31 is arranged at the middle of the conveying box 1 or near the discharge port 13. The channel 32 is arranged on the side wall of the conveying box 1 parallel to the conveying channel 2, the length of the channel 32 matches the length of the internal space of the demagnetization box 31, and the width of the channel 32 needs to ensure that the electromagnetic rod 34 can pass through. The driving structure 33 is used to control the movement of the electromagnetic rod 34, and the driving structure 33 can be a power device for driving the electromagnetic rod 34 to move in translation, in which case the electromagnetic rod 34 is preferably parallel to the length direction of the channel 32, so as to ensure that the path of the electromagnetic rod 34 in the conveying box 1 is unchanged, and the effective adsorption area is increased as much as possible, and the demagnetization efficiency is improved. The driving structure 33 can also be a power device for driving the electromagnetic rod 34 to rotate, in which case the electromagnetic rod 34 moves in a circular motion, and the effective adsorption area of the electromagnetic rod 34 is larger when the electromagnetic rod 34 rotates through the upper end of the conveying channel 2, compared with the translation mode. Therefore, the embodiment is preferred.

[0049] As a preferred embodiment, the demagnetization box 31 comprises a box body 311, a flat plate 312 arranged in the box body 311 and connected with the channel 32, a demagnetization port 313 arranged at the lower end of the box body 311, and a guide slope 314 arranged on the inner side wall of the box body 311 and extending to the demagnetization port 313. The flat plate 312 is a strip-shaped plate body, which provides a platform for the driving structure 33 and the electromagnetic rod 34 after being connected with the channel 32; the demagnetization port 313 is used to discharge the falling magnetic substances, and a valve body (not shown in the figure) of a control switch can be arranged on the demagnetization port 313; and the guide slope 314 is mainly used to quickly guide the magnetic substances to the demagnetization port 313, so as to improve the discharge speed.

[0050] As a preferred embodiment of the present embodiment, the driving structure 33 comprises a fixed cylinder 331 arranged on the flat plate 312, a rotating shaft 332 arranged in the fixed cylinder 331, a fixed block 333 arranged on the rotating shaft 332 and used for mounting the electromagnetic rod 34, and a motor 334 arranged on the demagnetizing tank 31 and having an output shaft connected with the rotating shaft 332 through the demagnetizing tank 31. A bearing is arranged between the rotating shaft 332 and the demagnetizing tank 31, and the fixed block 333 is a block fixedly arranged on the rotating shaft 332. A plurality of fixed blocks 333 can be arranged vertically on the rotating shaft 332, and one fixed block 333 is arranged corresponding to one electromagnetic rod 34. By increasing the number of electromagnetic rods 34, the frequency of the electromagnetic rod 34 entering the transmission tank 1 can be improved, thereby improving the demagnetizing efficiency.

[0051] In the present embodiment, the electromagnetic rod 34 comprises a rod body 341 and a protective sleeve 342 arranged outside the rod body 341; the control structure 35 comprises a wire 351 arranged around the outer circumferential side of the rod body 341 and a power supply 352 connected with the wire 351. The power supply 352 has a switch for opening / closing the power supply, which can be manually controlled or connected with the control panel for control. The protective sleeve 342 is made of insulating material and is used for protecting the rod body 341 and avoiding the safety hazard of electric leakage. The rod body 341 can be an electromagnetic rod, and two wires 351 are connected with two poles of the power supply 352, respectively. When the rod body 341 is electrified, it generates electromagnetic attraction, thereby having the ability of adsorbing magnetic substances in the raw materials.

[0052] The working principle of the screening and demagnetizing device provided by the present embodiment is as follows: the raw materials to be demagnetized are input into the horizontal tank 11 through the feeding port 12, fall onto the transmission channel 2 and move toward the discharging port 13, the driving structure 33 is started, the electromagnetic rod 34 repeatedly enters the horizontal tank 11 through the channel 32 and passes above the transmission channel 2. The control structure 35 is started / stopped according to the position of the electromagnetic rod 34. When the electromagnetic rod 34 is located in the horizontal tank 11, the control structure 35 is started, the electromagnetic rod 34 is electrified to generate electromagnetic attraction, and the magnetic substances are attracted by the electromagnetic rod 34 and move with the electromagnetic rod 34. When the electromagnetic rod 34 enters the demagnetizing tank 31, the control structure 35 is stopped, the electromagnetic rod 34 is de-energized, and the electromagnetic attraction disappears. At this time, the magnetic substances brought into the demagnetizing tank 31 fall into the demagnetizing tank 31 under the action of gravity.

[0053] Embodiment 2

[0054] The present embodiment is optimized on the basis of the embodiment 1, and the purpose is to improve the automation degree of the electromagnetic rod 34. The specific structure is as follows:

[0055] In the embodiment, the wire 351 includes a first connecting segment 351a and a second connecting segment 351b connected with two electrodes of the power supply 352, two main body segments 351c connected with the rod body 341, one of the main body segments 351c is connected with the first connecting segment 351a, and the other main body segment 351c is connected with a first conductive sheet 351d, and the second connecting segment 351b is connected with a second conductive sheet 351e at the end away from the power supply 352.

[0056] The two main body segments 351c can be two wires connected with the rod body 341, or two interfaces of one wire around the rod body 341, the former is used for directly controlling the rod body 341 to be electrified, and the latter is used for forming a turn around the rod body 341, and the turn is electrified to generate a magnetic field in the same direction as the rod body 341, so as to enhance the magnetic field strength and improve the magnetic attraction. When the first conductive sheet 351d and the second conductive sheet 351e are in butt joint, a power passage is formed, so as to form a magnetic field; when the first conductive sheet 351d and the second conductive sheet 351e are misaligned, the power passage is disconnected, and the magnetic field disappears or weakens.

[0057] Specifically, the protective sleeve 342 includes an inner cylinder 342a on which the first conductive sheet 351d is mounted, and an outer cylinder 342b mounted with the second conductive sheet 351e and in sliding connection with the inner cylinder 342a; the control structure 35 further includes a control member 353 for controlling the relative position of the inner cylinder 342a and the outer cylinder 342b. The inner cylinder 342a and the outer cylinder 342b are both closed at one end and open at the other end, the two openings are in butt joint, the rod body 341 is mounted in the outer cylinder 342b, and after the rod body 341 is mounted, the rod body 341 has a gap into which the outer wall of the inner cylinder 342a is inserted between the rod body 341 and the outer cylinder 342b, so as to ensure the close connection of the inner cylinder 342a and the outer cylinder 342b, and further ensure that the first conductive sheet 351d and the second conductive sheet 351e can be closely attached and successfully conduct electricity; the position of the inner cylinder 342a in the outer cylinder 342b is controlled by the control member 353, so as to make the first conductive sheet 351d and the second conductive sheet 351e butt joint or misaligned, and control the electrification and disconnection of the power passage. Further, when the protective sleeve 342 is at the maximum length, the first conductive sheet 351d and the second conductive sheet 351e are in butt joint.

[0058] In the embodiment, the control member 353 includes a supporting spring 353a arranged on the end of the electromagnetic rod 34 close to the inner cylinder 342a / outer cylinder 342b and connected with the inner wall of the inner cylinder 342a / outer cylinder 342b, and a pressing plate 353b arranged on the inner wall of the demagnetizing box 31 and used for pressing the inner cylinder 342a / outer cylinder 342b.

[0059] It is worth mentioning that the inner cylinder 342a and the outer cylinder 342b can be arranged at the end close to the side wall of the demagnetizing box 31, and the bottom surface of the outer cylinder is used for mounting the supporting spring 353a; the extrusion plate 353b can be a plate body protruding from the side wall of the demagnetizing box 31, or the inner side wall of the demagnetizing box 31 has a shape so that the electromagnetic rod 34 is compressed during rotation. Further preferably, the two symmetrical inner walls of the demagnetizing box 31 close to the channel 32 have a guide-in section, and the two ends of the inner wall away from the channel 32 are connected with the guide-in section as the main compression section, so that the electromagnetic rod 34 is powered off after rotating to a distance of the demagnetizing box 31, so that the magnetic material can fall in the middle position of the box body, facilitating collection and discharge, and the extension and contraction of the electromagnetic rod 34 can be gradual, which facilitates the improvement of the service life.

[0060] As a further preferred embodiment of the present embodiment, the protective sleeve 342 further comprises a track 342c arranged on the inner wall of the outer cylinder 342b, and a sliding column 342d arranged on the outer wall of the inner cylinder 342a and inserted into the track 342c; the second conductive sheet 351e is mounted on the bottom surface of the track 342c, the sliding column 342d is connected with the first conductive sheet 351d, and the sliding column 342d is made of conductive material. Wherein, the sliding connection mode of the track 342c and the sliding column 342d can strengthen the stability of the sliding connection between the inner cylinder 342a and the outer cylinder 342b, and the conductive material selected for the sliding column 342d can be any kind of metal material, preferably the same as the material of the first conductive sheet 351d, and preferably, the sliding column 342d is fixedly connected with the first conductive sheet 351d or integrally formed. When the number of sliding columns 342d is one, it is preferably mounted on the lower surface of the inner cylinder 342a, so that the gravity of the inner cylinder 342a can ensure that the sliding column 342d can abut against the bottom surface of the track 342c; in order to ensure the stability of sliding, the other side surface on which the sliding column 342d is mounted should also be provided with a sliding column body, which can be made of insulating material, and the first conductive sheet does not need to be provided, only to play the function of strengthening the sliding connection.

[0061] As a further preferred embodiment of the present embodiment, the protective sleeve 342 is provided with a circuit passage 342e through which the first connecting section 351a and the second connecting section 351b pass, and the circuit passage 342e is preferably parallel to the side wall of the cylinder body, so as to avoid the situation that the first connecting section and the second connecting section are accidentally broken during extension and contraction.

[0062] The method for controlling the graphite negative electrode material screening and demagnetizing device provided by the embodiment comprises: when the electromagnetic rod 34 enters the demagnetizing box 31, the control member 353 drives the inner cylinder 342a / outer cylinder 342b to slide so that the first conductive sheet 351d and the second conductive sheet 351e are misaligned, the main body section 351c is powered off, and the magnetism of the electromagnetic rod 34 disappears or is weakened; when the electromagnetic rod 34 leaves the demagnetizing box 31, the control member 353 drives the inner cylinder 342a / outer cylinder 342b to slide so that the first conductive sheet 351d and the second conductive sheet 351e are butt-jointed, the main body section 351c is powered on, and the magnetism of the electromagnetic rod 34 is restored or strengthened.

[0063] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A graphite anode material screening and demagnetizing device, comprising a transfer box (1), a transfer channel (2) disposed within the transfer box (1), and a demagnetizing device (3), characterized in that: The demagnetizing device (3) includes a demagnetizing box (31) disposed on the side end of the transmission box (1), a channel (32) disposed on the side wall of the transmission box (1), a drive structure (33) disposed on the demagnetizing box (31), an electromagnetic rod (34) connected to the drive structure (33) and entering / leaving the transmission box (1) through the channel (32), and a control structure (35) for supplying power to the electromagnetic rod (34). The electromagnetic rod (34) includes a rod body (341) and a protective sleeve (342) disposed on the outside of the rod body (341). The control structure (35) includes a wire (351) wound around the outer periphery of the rod (341) and a power supply (352) for connecting to the wire (351). The wire (351) includes a first connecting segment (351a) and a second connecting segment (351b) connected to the two electrodes of the power source (352), and two main body segments (351c) connected to the rod (341); one of the main body segments (351c) is connected to the first connecting segment (351a), the other main body segment (351c) is connected to a first conductive sheet (351d), and the end of the second connecting segment (351b) away from the power source (352) is connected to a second conductive sheet (351e). The protective sleeve (342) includes an inner cylinder (342a) on which the first conductive sheet (351d) is installed, an outer cylinder (342b) on which the second conductive sheet (351e) is installed and slidably connected to the inner cylinder (342a), a track (342c) disposed on the inner wall of the outer cylinder (342b), and a sliding post (342d) disposed on the outer wall of the inner cylinder (342a) and inserted into the track (342c); the second conductive sheet (351e) is installed on the bottom surface of the track (342c), the sliding post (342d) is connected to the first conductive sheet (351d), and the sliding post (342d) is made of conductive material; The control structure (35) further includes a control element (353) for controlling the relative position of the inner cylinder (342a) and the outer cylinder (342b). The control element (353) includes a support spring (353a) disposed on the end of the electromagnetic rod (34) near the inner cylinder (342a) / outer cylinder (342b) and connected to the inner wall of the inner cylinder (342a) / outer cylinder (342b), and a pressing plate (353b) disposed on the inner wall of the demagnetizing box (31) for pressing the inner cylinder (342a) / outer cylinder (342b).

2. The graphite negative electrode material screening and demagnetizing device according to claim 1, characterized in that: The electromagnetic rod (34) makes a circular motion and rotates through the upper end of the transmission channel (2).

3. The graphite negative electrode material screening and demagnetizing device according to claim 1, characterized in that: The protective sleeve (342) is provided with a circuit channel (342e) through which the first connecting segment (351a) and the second connecting segment (351b) pass.

4. The graphite negative electrode material screening and demagnetizing device according to claim 1, characterized in that: The demagnetizing box (31) includes a box body (311), a flat plate (312) disposed inside the box body (311) and connected to the channel (32), a magnetic discharge port (313) disposed at the lower end of the box body (311), and a guide slope (314) disposed on the inner side wall of the box body (311) and extending to the magnetic discharge port (313).

5. The graphite negative electrode material screening and demagnetizing device according to claim 4, characterized in that: The drive structure (33) includes a fixed cylinder (331) disposed on the plate (312), a rotating shaft (332) rotatably disposed in the fixed cylinder (331), a fixed block (333) disposed on the rotating shaft (332) for mounting the electromagnetic rod (34), and a motor (334) disposed on the demagnetizing box (31) and whose output shaft passes through the demagnetizing box (31) and is connected to the rotating shaft (332).

6. A method for controlling the graphite negative electrode material sieving and demagnetizing device according to claim 1, characterized in that: include: When the electromagnetic rod (34) enters the demagnetizing box (31), the control unit (353) drives the inner cylinder (342a) / outer cylinder (342b) to slide, causing the first conductive plate (351d) and the second conductive plate (351e) to misalign, the main body section (351c) to be de-energized, and the electromagnetic rod (34) to lose or weaken its magnetism; when the electromagnetic rod (34) leaves the demagnetizing box (31), the control unit (353) drives the inner cylinder (342a) / outer cylinder (342b) to slide, causing the first conductive plate (351d) and the second conductive plate (351e) to dock, the main body section (351c) to be energized, and the electromagnetic rod (34) to regain or strengthen its magnetism.

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