Natural graphite screening machine for preparing negative electrode material

Abstract

The invention relates to the technical field of graphite screening machines, in particular to a natural graphite screening machine for negative electrode material preparation, which comprises a screening tank, a dust discharge hole, a screening chamber and a collecting chamber which are sequentially communicated are respectively arranged in an inner cavity of the screening tank from top to bottom, and a screening mechanism for performing wind screening on graphite is arranged in the screening tank; the screening mechanism comprises an air inlet pipe which penetrates through and fixedly communicates with the side wall of the screening tank, a grading wheel is installed on the inner wall of the top of the screening chamber through a connecting rod, a grinding disc is arranged on the inner side wall of the screening chamber, a plurality of through holes are formed in the bottom wall of the grinding disc, and a filter plate is fixedly connected to the bottom of the grinding disc through a synchronizing rod. According to the graphite raw material dust screening device, under the action of strong centrifugal force generated by the grading turbine rotating at a high speed, upward airflow is generated in the screening chamber through the grading wheel, then dust in graphite raw materials moves along with the upward airflow and is discharged outwards through the dust discharging holes, and the purpose of screening the dust in the graphite raw materials is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of graphite sieving machines, and in particular to a natural graphite sieving machine for preparing negative electrode materials. Background Art

[0002] In order to solve the defects of flake graphite and optimize the performance of battery negative electrode materials, graphite needs to be modified. One of the most commonly used modification methods is spheroidization. The production of spherical graphite mainly uses high-quality high-carbon natural flake graphite as raw material. A series of forces such as mechanical collision, friction and shearing are used to cause plastic deformation and particle adsorption of graphite particles, thereby obtaining spherical graphite. The traditional spheroidization process is usually divided into two stages: crushing and shaping. The crushing stage is to crush the graphite flakes to a particle size suitable for shaping, and remove the fine powder generated during the crushing process. The shaping stage is to spheroidize the flaky graphite particles and the graphite particles shaped into a quasi-spherical shape in the crushing stage.

[0003] At present, in the process of spheroidizing natural graphite, it is often necessary to screen the natural graphite raw materials to remove dust in the natural graphite and collect spherical graphite that meets the requirements. However, the current graphite screening machine can only simply screen the natural graphite raw materials by wind power to remove some of the dust mixed therein, but some dust adhering to the natural graphite raw materials or dust not separated by the airflow in time will still remain on the natural graphite raw materials, affecting the subsequent use of spherical graphite; and the natural graphite raw materials invested need to be additionally processed by spheroidization process, which increases the production cycle and reduces the efficiency of graphite screening.

[0004] To this end, we proposed a natural graphite sieving machine for the preparation of negative electrode materials. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and to propose a natural graphite sieving machine for preparing negative electrode materials.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A natural graphite sieving machine for preparing negative electrode materials, comprising a sieving tank, wherein the inner cavity of the sieving tank is provided with dust discharge holes, a sieving chamber and a collecting chamber which are connected in sequence from top to bottom, and a sieving mechanism for performing wind sieving on graphite is provided inside the sieving tank;

[0008] The screening mechanism comprises an air inlet pipe penetrating and fixedly connected to the side wall of the screening tank, a grading wheel is installed on the top inner wall of the screening chamber through a connecting rod, a grinding disc is provided on the inner inner wall of the screening chamber, a plurality of through holes are opened on the bottom wall of the grinding disc, a filter plate is fixedly connected to the bottom of the grinding disc through a synchronous rod, a lower absorption pipe is symmetrically fixedly connected to the side wall of the screening chamber, an upper absorption pipe is penetrating and fixedly connected to the top side wall of the screening chamber, the lower absorption pipe and the upper absorption pipe are fixedly connected through a connecting pipe, and the connecting pipe is embedded in the inner wall of the screening tank;

[0009] A grinding mechanism for grinding the graphite raw material is arranged inside the screening tank.

[0010] Preferably, the grinding mechanism includes a slide plate slidably connected to the inner wall of the screening chamber, the bottom wall of the slide plate is fixedly connected to a circular tube, the inner wall of the circular tube is provided with a spiral hole, a cylinder is provided inside the circular tube, the side wall of the cylinder is slidably connected to a sliding rod, the other end of the sliding rod is slidably connected to the inner wall of the screening chamber, the side wall of the cylinder is fixedly connected to a sliding rod, the sliding rod is slidably connected to the spiral hole, the top wall of the cylinder is rotatably connected to a return spring, one end of the return spring away from the cylinder is fixedly connected to the bottom wall of the slide plate, and one end of the cylinder away from the return spring is fixedly connected to a grinding block.

[0011] Preferably, a motor is embedded and fixedly connected to the inner wall of the screening chamber, the output end of the motor is fixedly connected to a rotating shaft, the end of the rotating shaft away from the motor is fixedly connected to a cross bar, the side wall of the cross bar away from the rotating shaft is rotatably connected to a push rod through a circular shaft, and the end of the push rod away from the circular shaft is rotatably connected to a slide.

[0012] Preferably, a circular ring plate is fixedly connected to the grinding disc, and the inner wall of the circular ring plate is provided with vertical grooves and oblique grooves that are interconnected. The bottom wall of the slide plate is fixedly connected to a vertical rod, and the end of the vertical rod away from the slide is fixedly connected to a driving rod, and the end of the driving rod away from the vertical rod is slidably connected inside the vertical groove.

[0013] Preferably, the inner wall of the screening chamber is symmetrically provided with rectangular grooves, the inner walls of the rectangular grooves are slidably connected with sliding blocks, the inner wall of each sliding block is fixedly connected with a tension spring, one end of the tension spring away from the sliding block is fixedly connected to the inner wall of the rectangular groove, and the grinding disc is slidably connected to the two sliding blocks.

[0014] Preferably, the inner wall of the screening chamber is symmetrically fixedly connected with a support plate, the inner wall of the support plate is commonly penetrated by a rotating rod rotatably connected, the two ends of the rotating rod are respectively arranged in two upper absorption tubes, and the two ends of the rotating rod are respectively fixedly connected with a negative pressure fan.

[0015] Preferably, a first gear is fixedly connected to the side wall of the rotating shaft, a second gear is fixedly connected to the side wall of the rotating rod, and the second gear is meshingly connected to the first gear.

[0016] Preferably, a feed pipe is fixedly connected to the side wall of the screening tank, a discharge valve is fixedly installed on the bottom wall of the collecting chamber, and a plurality of supporting legs are fixedly connected to the side wall of the screening tank.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. Add the graphite raw material into the screening tank through the feed pipe, turn on the classifying wheel and the motor, and the classifying wheel generates an upward airflow inside the screening chamber under the strong centrifugal force generated by the high-speed rotating classifying turbine, so that the dust in the graphite raw material moves with the upward airflow and is discharged outward through the dust discharge hole, so as to achieve the purpose of screening the dust in the graphite raw material;

[0019] 2. The output end of the motor drives the rotating shaft to rotate. By setting structures such as the rotating shaft, the return spring and the cylinder, the cylinder drives the grinding block fixed at its bottom to move downward synchronously until the grinding block and the grinding disc are in contact. At this time, the grinding block impacts and crushes the graphite raw material on the grinding disc, which is convenient for the subsequent grinding of the graphite raw material. In addition, the dust generated during the impact and crushing process of the graphite raw material can continue to be screened and discharged by wind power;

[0020] 3. When the grinding block slides down to the end of the stroke, the slide plate squeezes the reset spring and continues to slide down for a distance. Then the spiral hole opened on the side wall of the round tube will drive the slide rod to move, so that the slide rod drives the cylinder and the grinding block to rotate synchronously. The grinding block will rotate and grind the graphite raw material on the grinding disc during the rotation process.

[0021] 4. When the grinding block is rotating and grinding the graphite raw material on the grinding disc, by setting structures such as vertical rods, inclined grooves and circular plates, the circular plates drive the grinding disc to rotate in the opposite direction, so that the grinding block has a better grinding effect on the raw material graphite on the grinding disc, and improves the spherical shaping effect of the graphite raw material;

[0022] 5. When the slide plate moves upward in the vertical direction, the grinding block and the grinding disc are quickly separated. Under the elastic force of the tension spring, the grinding disc vibrates back and forth. The grinding block will continuously throw the ground graphite raw materials upward. Then, the spheroidized graphites that initially meet the requirements will first be screened and fall onto the filter plate. Then, the filter plate will screen the spheroidized graphites that fall on the upper part again. Finally, the spheroidized graphites that meet the requirements will fall into the collection bin.

[0023] 6. By setting up multiple gears, connecting pipes and negative pressure fans, the negative pressure fan will perform negative pressure exhaust inside the upper absorption pipe, and the lower absorption pipe will use wind to suck and separate the dust that falls on the filter plate, thereby improving the screening ability of dust in spherical graphite. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of a natural graphite screening machine for preparing negative electrode materials proposed by the present invention;

[0025] Figure 2 for Figure 1 A magnified schematic diagram of the structure of part A;

[0026] Figure 3 for Figure 1 A magnified schematic diagram of the structure of part B;

[0027] Figure 4 This is a schematic diagram of the structure inside a circular tube in a natural graphite sieving machine for preparing negative electrode materials proposed by the present invention;

[0028] Figure 5 This is a schematic diagram of the structure inside the annular plate in a natural graphite screening machine for preparing negative electrode materials proposed by the present invention;

[0029] Figure 6 This is a schematic diagram of the appearance of a grinding disc in a natural graphite sieving machine for preparing negative electrode materials proposed by the present invention;

[0030] Figure 7 This is an appearance diagram of a natural graphite screening machine for preparing negative electrode materials proposed in the present invention.

[0031] In the figure: 1, screening tank; 2, dust discharge hole; 3, classification wheel; 4, cylinder; 5, sliding rod; 6, grinding block; 7, grinding disc; 8, through hole; 9, filter plate; 10, screening chamber; 11, collecting chamber; 12, air inlet pipe; 13, synchronization rod; 14, circular plate; 15, vertical groove; 16, inclined groove; 17, vertical rod; 18, driving rod; 19, lower absorption pipe; 20, connecting pipe; 22, upper absorption pipe; 23, Support plate; 24, rotating rod; 25, negative pressure fan; 26, second gear; 27, motor; 28, rotating shaft; 29, first gear; 30, cross bar; 31, feed pipe; 32, supporting leg; 33, discharge valve; 34, rectangular groove; 35, sliding block; 36, tension spring; 37, sliding plate; 38, round tube; 39, reset spring; 40, spiral hole; 41, sliding rod; 42, round shaft; 43, push rod. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0033] Reference Figure 1 - Figure 7 A natural graphite screening machine for preparing negative electrode materials comprises a screening tank 1, wherein the inner cavity of the screening tank 1 is provided with dust discharge holes 2, a screening chamber 10 and a collecting chamber 11 which are connected in sequence from top to bottom, and a screening mechanism for performing wind screening on graphite is provided inside the screening tank 1;

[0034] The screening mechanism includes an air inlet pipe 12 which penetrates and is fixedly connected to the side wall of the screening tank 1. A grading wheel 3 is installed on the inner wall of the top of the screening chamber 10 through a connecting rod. The grading wheel 3 is a prior art and is a device for sorting powder particle size. When the grading wheel 3 is working, the coarse and fine materials that move to the grading area with the rising airflow are separated under the strong centrifugal force generated by the high-speed rotating grading turbine. The fine particles that meet the particle size requirements pass through the grading wheel 3 and enter the next component to be collected, and the coarse particles fall into the crushing area for further crushing. A grinding disc 7 is provided on the inner wall of the screening chamber 10, and the air inlet pipe 12 is located above the grinding disc 7. A plurality of through holes 8 (such as Figure 6 As shown), a plurality of through holes 8 are used to screen the spherical graphite that preliminarily meets the requirements in the ground graphite raw materials, the bottom of the grinding disc 7 is fixedly connected to the filter plate 9 through the synchronous rod 13, the side wall of the screening chamber 10 is symmetrically fixedly connected to the lower absorption pipe 19, the top side wall of the screening chamber 10 is penetrated and fixedly connected to the upper absorption pipe 22, the lower absorption pipe 19 and the upper absorption pipe 22 are fixedly connected through the connecting pipe 20, and the connecting pipe 20 is embedded in the inner wall of the screening tank 1;

[0035] A grinding mechanism for grinding the graphite raw material is arranged inside the screening tank 1 .

[0036] The grinding mechanism includes a slide plate 37 which is slidably connected to the inner wall of the screening chamber 10, the bottom wall of the slide plate 37 is fixedly connected to a circular tube 38, the inner wall of the circular tube 38 is provided with a spiral hole 40, a cylinder 4 is provided inside the circular tube 38, a sliding rod 5 is slidably connected to the side wall of the cylinder 4, when the cylinder 4 rotates, the sliding rod 5 will not interfere with it, the other end of the sliding rod 5 is slidably connected to the inner wall of the screening chamber 10, the sliding rod 5 slides along the vertical direction of the inner wall of the screening chamber 10, the side wall of the cylinder 4 is fixedly connected to a sliding rod 41, the sliding rod 41 is slidably connected inside the spiral hole 40, the top wall of the cylinder 4 is rotatably connected to a return spring 39, the end of the return spring 39 away from the cylinder 4 is fixedly connected to the bottom wall of the slide plate 37, the end of the cylinder 4 away from the return spring 39 is fixedly connected to the grinding block 6.

[0037] A motor 27 is fixedly connected to the inner wall of the screening chamber 10, a rotating shaft 28 is fixedly connected to the output end of the motor 27, a cross bar 30 is fixedly connected to the end of the rotating shaft 28 away from the motor 27, a circular shaft 42 is fixedly connected to the side wall of the cross bar 30 away from the rotating shaft 28, a push rod 43 is rotatably connected to the side wall of the circular shaft 42, and the end of the push rod 43 away from the circular shaft 42 is rotatably connected to the slide plate 37.

[0038] A circular plate 14 is fixedly connected to the grinding disc 7, and the inner wall of the circular plate 14 is provided with a vertical groove 15 and an inclined groove 16 which are interconnected. The inclined groove 16 is a partial spiral groove structure. A vertical rod 17 is fixedly connected to the bottom wall of the slide plate 37, and a driving rod 18 is fixedly connected to the end of the vertical rod 17 away from the slide plate 37, and the end of the driving rod 18 away from the vertical rod 17 is slidably connected to the inside of the vertical groove 15.

[0039] The inner wall of the screening chamber 10 is symmetrically provided with rectangular grooves 34, and the inner walls of the rectangular grooves 34 are slidably connected with sliding blocks 35. The inner wall of each sliding block 35 is fixedly connected with a tension spring 36, and one end of the tension spring 36 away from the sliding block 35 is fixedly connected to the inner wall of the rectangular groove 34. The grinding disk 7 is slidably connected to the two sliding blocks 35, and the grinding disk 7 can rotate and slide on the side walls of the two sliding blocks 35, but the grinding disk 7 can drive the two sliding blocks 35 to move in the vertical direction.

[0040] The inner wall of the screening chamber 10 is symmetrically fixedly connected with a support plate 23, and the inner wall of the support plate 23 is rotatably connected with a rotating rod 24, both ends of the rotating rod 24 are respectively arranged in the two upper absorption tubes 22, and both ends of the rotating rod 24 are respectively fixedly connected with a negative pressure fan 25.

[0041] A first gear 29 is fixedly connected to the side wall of the rotating shaft 28 , and a second gear 26 is fixedly connected to the side wall of the rotating rod 24 . The second gear 26 is meshingly connected to the first gear 29 .

[0042] A feed pipe 31 is fixedly connected to the side wall of the screening tank 1 , a discharge valve 33 is fixedly installed on the bottom wall of the collecting chamber 11 , and a plurality of supporting legs 32 are fixedly connected to the side wall of the screening tank 1 .

[0043] In the present invention, the user adds the graphite raw material into the screening tank 1 through the feed pipe 31, and the graphite raw material remains on the upper part of the grinding disc 7, and the grinding disc 7 is in an inverted frustum-shaped structure. The classifying wheel 3 and the motor 27 are turned on. Under the strong centrifugal force generated by the high-speed rotating classifying turbine, the classifying wheel 3 generates an upward airflow inside the screening chamber 10, and then the dust in the graphite raw material moves with the upward airflow, and is discharged outwardly through the dust exhaust hole 2, so as to achieve the purpose of screening the dust in the graphite raw material.

[0044] The output end of the motor 27 drives the rotating shaft 28 to rotate, and the rotating shaft 28 drives the cross bar 30 to rotate. The cross bar 30 drives the slide plate 37 connected to it to slide back and forth along the vertical direction for a distance on the inner wall of the screening chamber 10. The reset spring 39 has a large stiffness coefficient, and the stiffness coefficient of the reset spring 39 is greater than the stiffness coefficient of the tension spring 36. Then the slide plate 37 will drive the cylinder 4 to move downward synchronously through the reset spring 39, and the cylinder 4 will drive the grinding block 6 fixedly connected to its bottom end to move downward synchronously until the grinding block 6 and the grinding disk 7 are in contact. At this time, the grinding block 6 impacts and crushes the graphite raw material on the grinding disk 7, which is convenient for the subsequent grinding of the graphite raw material, and the dust generated during the impact and crushing of the graphite raw material can continue to be screened and discharged by wind.

[0045] After the grinding block 6 and the grinding disc 7 collide with each other, the grinding block 6 will also drive the grinding disc 7 to move downward synchronously for a distance. At this time, the grinding disc 7 will drive the two sliding blocks 35 to move downward synchronously for a distance and squeeze the tension spring 36. In the above process, the slide plate 37 will also drive the circular tube 38 to move downward synchronously. Since the side wall of the cylinder 4 is fixedly connected with the slide bar 41, when the grinding block 6 slides to the end of the stroke, the grinding block 6 will not be able to slide downward, but at this time the slide plate 37 still has a tendency to slide downward for a distance, then the reset spring 39 will be compressed, and the circular tube 38 will continue to slide downward for a distance with the slide plate 37, then the spiral hole 40 opened on the side wall of the circular tube 38 will drive the slide bar 41 to move along its spiral aperture trajectory, so that the slide bar 41 drives the cylinder 4 to rotate, then the cylinder 4 will drive the grinding block 6 to rotate synchronously, and the grinding block 6 will rotate and grind the graphite raw material on the grinding disc 7 during the rotation.

[0046] When the grinding block 6 is rotating and grinding the graphite raw material on the grinding disk 7, since the slide plate 37 can also drive the vertical rod 17 to move downward synchronously, the vertical rod 17 drives the driving rod 18 to slide inside the vertical groove 15. At this time, the driving rod 18 will slide into the inclined groove 16. By setting the inclined groove 16, when the driving rod 18 slides inside the inclined groove 16, the driving rod 18 drives the annular plate 14 to slide through the inclined groove 16 to produce a rotation effect, and the rotation directions of the annular plate 14 and the grinding block 6 are opposite, then the annular plate 14 will drive the grinding disk 7 to rotate in the opposite direction, so that the grinding block 6 has a better grinding effect on the raw material graphite on the grinding disk 7, and improves the spherical shaping effect of the graphite raw material.

[0047] When the slide plate 37 moves upward in the vertical direction, the slide plate 37 will also drive the cylinder 4 and the grinding block 6 to move upward through the return spring 39 until the grinding block 6 is quickly separated from the grinding disk 7. Then the grinding disk 7 will move upward under the action of the two sliding blocks 35 and the tension spring 36, and the grinding disk 7 will vibrate reciprocatingly under the elastic force of the tension spring 36. Then the grinding block 6 will continuously throw the ground graphite raw materials upward, and these spheroidized graphites that initially meet the requirements will first be screened and fall onto the filter plate 9, thereby improving the screening efficiency of the spheroidized graphite that initially meets the requirements. Then, because the grinding disk 7 will drive the filter plate 9 to shake up and down synchronously through the synchronization rod 13, the filter plate 9 will screen the spheroidized graphite that falls on its upper part again, and finally the spheroidized graphite that meets the requirements will fall into the collection chamber 11.

[0048] In the process of spheroidized graphite that meets the requirements being screened and falling onto the filter plate 9, there will be some dust generated during the grinding process that is not separated by the airflow in time or adheres to the spheroidized graphite and falls onto the filter plate 9 together. Then, these dusts are located below the grinding disc 7, and the grinding disc 7 interferes with the upward airflow inside the screening chamber 10, making it difficult for these dusts to be screened out. When the output end of the motor 27 drives the rotating shaft 28 to rotate, the rotating shaft 28 drives the first gear 29 to rotate. By setting the transmission ratio of the first gear 29 to the second gear 26, the first gear 29 is rotated. The wheel 29 drives the second gear 26 to rotate rapidly, and the second gear 26 drives the rotating rod 24 to rotate rapidly, and the negative pressure fan 25 fixedly connected at both ends of the rotating rod 24 will rotate rapidly, and the negative pressure fan 25 will perform negative pressure exhaust inside the upper absorption pipe 22. Since the upper absorption pipe 22, the connecting pipe 20 and the lower absorption pipe 19 are connected, and the lower absorption pipe 19 is located between the grinding disc 7 and the filter plate 9, the lower absorption pipe 19 will separate the dust that falls on the filter plate 9 by wind suction, thereby improving the screening ability of dust in the spherical graphite.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A natural graphite screening machine for preparing negative electrode materials, comprising a screening tank (1), wherein the inner cavity of the screening tank (1) is provided with dust discharge holes (2), a screening chamber (10) and a collecting chamber (11) which are connected in sequence from top to bottom, characterized in that: The screening tank (1) is provided with a screening mechanism for performing wind screening on graphite; The screening mechanism comprises an air inlet pipe (12) penetrating and fixedly connected to the side wall of the screening tank (1); a grading wheel (3) is installed on the top inner wall of the screening chamber (10) via a connecting rod; a grinding disc (7) is provided on the inner side wall of the screening chamber (10); a plurality of through holes (8) are provided on the bottom wall of the grinding disc (7); a filter plate (9) is fixedly connected to the bottom of the grinding disc (7) via a synchronous rod (13); a lower absorption pipe (19) is symmetrically fixedly connected to the side wall of the screening chamber (10); an upper absorption pipe (22) is penetrating and fixedly connected to the top side wall of the screening chamber (10); the lower absorption pipe (19) and the upper absorption pipe (22) are fixedly connected via a connecting pipe (20); and the connecting pipe (20) is embedded in the inner wall of the screening tank (1); A grinding mechanism for grinding graphite raw materials is provided inside the screening tank (1).

2. The natural graphite sieving machine for preparing negative electrode materials according to claim 1, characterized in that: The grinding mechanism comprises a slide plate (37) slidably connected to the inner wall of the screening chamber (10); the bottom wall of the slide plate (37) is fixedly connected to a circular tube (38); the inner wall of the circular tube (38) is provided with a spiral hole (40); a cylinder (4) is provided inside the circular tube (38); the side wall of the cylinder (4) is slidably connected to a sliding rod (5); the other end of the sliding rod (5) is slidably connected to the inner wall of the screening chamber (10); the side wall of the cylinder (4) is fixedly connected to a sliding rod (41); the sliding rod (41) is slidably connected inside the spiral hole (40); the top wall of the cylinder (4) is rotatably connected to a return spring (39); one end of the return spring (39) away from the cylinder (4) is fixedly connected to the bottom wall of the slide plate (37); and one end of the cylinder (4) away from the return spring (39) is fixedly connected to a grinding block (6).

3. The natural graphite sieving machine for preparing negative electrode materials according to claim 2, characterized in that: A motor (27) is embedded and fixedly connected to the inner wall of the screening chamber (10); an output end of the motor (27) is fixedly connected to a rotating shaft (28); an end of the rotating shaft (28) away from the motor (27) is fixedly connected to a cross bar (30); a side wall of the cross bar (30) away from the rotating shaft (28) is rotatably connected to a push rod (43) via a circular shaft (42); and an end of the push rod (43) away from the circular shaft (42) is rotatably connected to a slide plate (37).

4. The natural graphite sieving machine for preparing negative electrode materials according to claim 3, characterized in that: The grinding disc (7) is fixedly connected to a circular plate (14), the inner side wall of the circular plate (14) is provided with a vertical groove (15) and an inclined groove (16) which are interconnected, the bottom wall of the slide plate (37) is fixedly connected to a vertical rod (17), one end of the vertical rod (17) away from the slide plate (37) is fixedly connected to a driving rod (18), and one end of the driving rod (18) away from the vertical rod (17) is slidably connected inside the vertical groove (15).

5. The natural graphite screening machine for preparing negative electrode materials according to claim 4, characterized in that: The inner wall of the screening chamber (10) is symmetrically provided with rectangular grooves (34), the inner walls of the rectangular grooves (34) are slidably connected with sliding blocks (35), the inner wall of each sliding block (35) is fixedly connected with a tension spring (36), one end of the tension spring (36) away from the sliding block (35) is fixedly connected to the inner wall of the rectangular groove (34), and the grinding disc (7) is slidably connected to the two sliding blocks (35).

6. The natural graphite sieving machine for preparing negative electrode materials according to claim 3, characterized in that: The inner wall of the screening chamber (10) is symmetrically fixedly connected with a support plate (23), and the inner wall of the support plate (23) is rotatably connected with a rotating rod (24), and the two ends of the rotating rod (24) are respectively arranged in two upper absorption tubes (22), and the two ends of the rotating rod (24) are respectively fixedly connected with a negative pressure fan (25).

7. The natural graphite sieving machine for preparing negative electrode materials according to claim 6, characterized in that: A first gear (29) is fixedly connected to the side wall of the rotating shaft (28), a second gear (26) is fixedly connected to the side wall of the rotating rod (24), and the second gear (26) is meshingly connected to the first gear (29).

8. The natural graphite screening machine for preparing negative electrode materials according to claim 1, characterized in that: A feed pipe (31) is fixedly connected to and penetrates the side wall of the screening tank (1), a discharge valve (33) is fixedly installed on the bottom wall of the collecting chamber (11), and a plurality of support legs (32) are fixedly connected to the side wall of the screening tank (1).

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