Anode material powder screening all-in-one machine and powder screening method thereof

Abstract

The application discloses a negative electrode material powder and sieve integrated machine and a powder and sieve method thereof, and relates to the technical field of negative electrode material powder and sieve, which comprises a rectangular frame, a square plate is clamped in the rectangular frame, a circular through hole is formed in the middle part of the square plate, a first sieve cylinder is clamped in the top end of the circular through hole, a second sieve cylinder is clamped in the bottom end of the circular through hole, and a material collecting box is placed directly below the second sieve cylinder; a fixed lug seat is fixedly arranged on the right side of the rear side wall in the rectangular frame, a fixed shaft is inserted through the front end of the fixed lug seat, a rotating disc is arranged on the top end of the fixed shaft, a reciprocating swing arm is arranged above the rotating disc, and the reciprocating swing arm is connected with the square plate through a reciprocating assembly. The application can not only accurately control the particle size of the negative electrode material and ensure the stability of product quality, but also automatically complete the sieving process, improve production efficiency and work efficiency, and save labor cost.

Description

Technical Field

[0001] This invention relates to the field of negative electrode material powder screening technology, and in particular to an integrated negative electrode material powder screening machine and its screening method. Background Technology

[0002] The integrated grinding and screening machine for negative electrode materials is a piece of equipment used in the screening process of negative electrode material production. It separates powdery materials from raw materials through screening to obtain negative electrode materials of the required particle size. As disclosed in Chinese invention patent (Publication No.: CN116689076A), it includes: a shell, with a coaxially arranged guide plate fixedly installed on the lower part of its inner wall. The sides of the guide plate are inclined to facilitate material discharge, and a vertically arranged drive motor is fixedly installed at the center of the bottom surface of the guide plate, with a transmission shaft fixedly connected to the output shaft of the drive motor; it also includes: a support plate, coaxially arranged above the guide plate, with the side wall of the support plate fixedly installed on the inner wall of the shell, and a transmission shaft rotatably passing through the axis of the support plate.

[0003] In the processing of lithium battery anode materials, the raw materials of the anode materials need to be screened. Because carbon material particles have excellent lubrication and conductivity properties and strong adhesion, carbon particles are easy to adhere to the screen mesh during the screening process, causing screen blockage, reducing screening efficiency and failing to meet people's needs. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies in the poor sieving effect of negative electrode materials, and to propose an integrated negative electrode material sieving machine and its sieving method.

[0005] To address the problems existing in the prior art, the present invention adopts the following technical solution:

[0006] A negative electrode material powder screening integrated machine includes a rectangular frame, with support legs fixed at the four corners of the bottom surface of the rectangular frame. A square plate that is slidably connected to the left and right is fitted inside the rectangular frame. A circular through hole is opened in the middle of the square plate. A first screen cylinder that is rotatably connected is fitted inside the top port of the circular through hole. A second screen cylinder that is rotatably connected is fitted inside the bottom port of the circular through hole. A collection box with an open top surface is placed directly below the second screen cylinder.

[0007] A fixed lug is fixedly provided on the right side of the rear side wall inside the rectangular frame. A fixed shaft is rotatably connected and inserted through the front end of the fixed lug. A turntable is concentrically fixed and fitted on the top end of the fixed shaft. A reciprocating swing arm is provided above the turntable and is suspended in the air. The reciprocating swing arm is connected to the square plate through a reciprocating assembly.

[0008] Preferably, a pair of symmetrically distributed rectangular slots are provided on the front and rear side walls of the rectangular frame, and a pair of symmetrically distributed rectangular plates are fixed on the front and rear side walls of the square plate, with each rectangular plate slidingly engaging in the rectangular slot on the corresponding side.

[0009] A pair of symmetrically distributed buffer springs are fixed to the left side wall of the square plate, and the outer end of each buffer spring is fixed to the left side wall of the rectangular frame.

[0010] Preferably, a pair of rotating slots are provided on the inner ring surface of the circular through hole, a first rotating retaining ring is fitted at the bottom end of the first screen cylinder and a second rotating retaining ring is fitted at the top end of the second screen cylinder, and the first rotating retaining ring and the second rotating retaining ring are sequentially rotated and engaged in the pair of rotating slots.

[0011] Preferably, a reciprocating pin is fixed at the rear end of the reciprocating swing arm, the bottom end of the reciprocating pin is rotatably inserted into the rectangular frame, a first elliptical pin hole is opened in the middle of the reciprocating swing arm, and an eccentrically distributed limiting pin is fixed on the top surface of the turntable, the top end of the limiting pin is slidably inserted into the first elliptical pin hole.

[0012] Preferably, the reciprocating assembly includes a fixed long plate and a fixed pin. A horizontally distributed fixed long plate is fixed at the right front corner of the square plate. A fixed pin is fixed at the right end of the top surface of the fixed long plate. A second elliptical pin hole is opened at the front end of the reciprocating swing arm. The top end of the fixed pin is slidably inserted into the second elliptical pin hole.

[0013] Preferably, a fixed bracket is fixedly provided in the middle of the right side wall of the rectangular frame, and a servo motor with its output end facing downward is fixedly provided in the middle of the fixed bracket. A small-diameter pulley is concentrically fixed to the end of the motor shaft of the servo motor, and a large-diameter pulley is concentrically fixed to the bottom end of the fixed shaft. The small-diameter pulley is synchronously connected to the large-diameter pulley through a drive belt.

[0014] Preferably, a first gear ring is concentrically fixed to the lower middle part of the first screen cylinder, a first rack is fixed to the rear side of the top surface of the rectangular frame, and a pair of first connecting shafts are inserted at the two corners of the rear side of the top surface of the square plate. Each first connecting shaft is fitted with a first linkage gear concentrically fixed to its top end, and each first linkage gear is meshed with the first gear ring and the first rack.

[0015] Preferably, a second gear ring is concentrically fixed to the upper middle part of the second screen cylinder, a second rack is fixed to the front side of the bottom of the rectangular frame, and a pair of rotatably connected second connecting shafts are inserted at the two corners of the front side of the bottom of the square plate. A second linkage gear is concentrically fixed to the bottom end of each second connecting shaft, and each second linkage gear is meshed with the second gear ring and the second rack.

[0016] Preferably, the bottom wall of the first sieve cylinder is provided with a plurality of evenly distributed coarse particle sieve holes, and the bottom wall of the second sieve cylinder is provided with a plurality of evenly distributed fine particle sieve holes.

[0017] This invention also proposes a powder screening method for an integrated negative electrode material powder screening machine, comprising the following steps:

[0018] Step 1: Start the servo motor. The motor shaft of the servo motor drives the small diameter pulley to rotate synchronously. The small diameter pulley drives the large diameter pulley, fixed shaft and turntable to rotate synchronously through the drive belt. The limit pin and the first elliptical pin hole form a limit function, driving the reciprocating swing arm to swing back and forth along the reciprocating pin.

[0019] Step 2: When the reciprocating swing arm swings back and forth, the fixed pin and the second elliptical pin hole form a limiting effect, driving the fixed long plate, square plate and a pair of rectangular clamping plates to slide back and forth along the rectangular clamping groove, and simultaneously driving the first screen cylinder and the second screen cylinder to move back and forth.

[0020] Step 3: When the first screen cylinder moves back and forth, the first linkage gear on it meshes and rotates along the first rack, and then meshes and drives the first gear ring, the first screen cylinder, and the first rotating retaining ring to rotate along the rotating retaining groove.

[0021] Step four: When the second screen cylinder reciprocates, the second linkage gear on it meshes and rotates along the second rack, and then meshes and drives the second gear ring, the second screen cylinder, and the second rotating retaining ring to rotate along the rotating retaining groove.

[0022] Step 5: During the reciprocating translation process, the first and second screen cylinders always rotate in opposite directions. The negative electrode material is added into the first screen cylinder and initially screened through the coarse particle screen in the first screen cylinder. Then, the negative electrode material is screened again through the fine particle screen in the second screen cylinder. Finally, the screened negative electrode material falls into the collection box.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. In this invention, driven by the servo motor, the reciprocating swing arm, the limiting pin, and the fixed pin form a limiting function, driving the square plate, the first screen cylinder, and the second screen cylinder to reciprocate and move horizontally, and performing preliminary powder sieving through the first screen cylinder and the second screen cylinder.

[0025] 2. In this invention, the first screen cylinder and the second screen cylinder always rotate in opposite directions during the reciprocating translation process. The negative electrode material is initially screened through the coarse particle screen holes in the first screen cylinder, and then the negative electrode material is screened again through the fine particle screen holes in the second screen cylinder.

[0026] In summary, this invention solves the problem of poor sieving effect of negative electrode material powder. Moreover, with a reasonable structural design, it can not only accurately control the particle size of negative electrode material and ensure stable product quality, but also automatically complete the sieving process, improve production efficiency and work efficiency, and save labor costs. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a cross-sectional view of the overall structure of the present invention;

[0030] Figure 3 This is an exploded cross-sectional view of the overall structure of the present invention;

[0031] Figure 4 This is an exploded cross-sectional view of the square plate, the first sieve cylinder, and the second sieve cylinder of the present invention.

[0032] The numbers in the diagram are as follows: 1. Rectangular frame; 11. Square plate; 12. First screen cylinder; 13. First gear ring; 14. Second screen cylinder; 15. Second gear ring; 16. Collection box; 17. Fixed long plate; 18. Fixed pin; 2. Servo motor; 21. Drive belt; 22. Turntable; 23. Reciprocating swing arm; 24. Limit pin; 25. First linkage gear; 26. First rack; 27. Second linkage gear; 28. Second rack. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] Example 1: This example provides an integrated negative electrode material powder screening machine, see [link to example]. Figure 1-4Specifically, it includes a rectangular frame 1, with support legs fixed at the four corners of the bottom surface of the rectangular frame 1. A square plate 11 that is slidably connected to the left and right is fitted inside the rectangular frame 1. A circular through hole is opened in the middle of the square plate 11. A first screen cylinder 12 that is rotatably connected is fitted inside the top port of the circular through hole. A second screen cylinder 14 that is rotatably connected is fitted inside the bottom port of the circular through hole. A collection box 16 with an open top surface is placed directly below the second screen cylinder 14.

[0035] A fixed ear is fixedly provided on the right side of the rear side wall inside the rectangular frame 1. A fixed shaft is inserted through the front end of the fixed ear and rotated. A turntable 22 is fitted on the top end of the fixed shaft and is concentrically fixed. A reciprocating swing arm 23 is provided above the turntable 22 and is suspended in the air. The reciprocating swing arm 23 is connected to the square plate 11 through a reciprocating assembly.

[0036] In the specific implementation process, such as Figure 2 and Figure 4 As shown, a pair of symmetrically distributed rectangular slots are provided on the front and rear side walls of the rectangular frame 1, and a pair of symmetrically distributed rectangular plates are fixed on the front and rear side walls of the square plate 11. Each rectangular plate is slidably engaged in the rectangular slot on the corresponding side. When the square plate 11 moves back and forth, it drives the rectangular plates to slide back and forth along the rectangular slots.

[0037] A pair of symmetrically distributed buffer springs are fixed on the left side wall of the square plate 11, and the outer end of each buffer spring is fixed to the inner left side wall of the rectangular frame 1; the buffer springs play a buffering role to ensure the stability of the square plate 11.

[0038] A pair of rotating slots are provided on the inner ring surface of the circular through hole. The bottom end of the first screen cylinder 12 is fitted with a first rotating retaining ring that is concentrically fixed, and the top end of the second screen cylinder 14 is fitted with a second rotating retaining ring that is concentrically fixed. The first rotating retaining ring and the second rotating retaining ring are sequentially rotated and engaged in the pair of rotating slots. During the reciprocating translation process, the first screen cylinder 12 and the second screen cylinder 14 always maintain a reciprocating rotation in opposite directions.

[0039] It should be noted that in this embodiment, the bottom wall of the first sieve cylinder 12 is provided with a number of evenly distributed coarse particle sieve holes, and the bottom wall of the second sieve cylinder 14 is provided with a number of evenly distributed fine particle sieve holes.

[0040] The negative electrode material is added into the first screen cylinder 12 and preliminarily screened through the coarse particle screen holes in the first screen cylinder 12. Then, the negative electrode material is screened again through the fine particle screen holes in the second screen cylinder 14. Finally, the screened negative electrode material falls into the collection box 16.

[0041] Example 2: Based on Example 1, this example also includes:

[0042] In the specific implementation process, such as Figure 2and Figure 3 As shown, a reciprocating pin is fixed at the rear end of the reciprocating swing arm 23. The bottom end of the reciprocating pin is rotatably inserted into the rectangular frame 1. A first elliptical pin hole is opened in the middle of the reciprocating swing arm 23. An eccentrically distributed limiting pin 24 is fixed on the top surface of the turntable 22. The top end of the limiting pin 24 is slidably inserted into the first elliptical pin hole. The limiting pin 24 and the first elliptical pin hole form a limiting effect, driving the reciprocating swing arm 23 to swing back and forth along the reciprocating pin.

[0043] The reciprocating assembly includes a fixed long plate 17 and a fixed pin 18. A horizontally distributed fixed long plate 17 is fixed at the right front corner of the square plate 11. A fixed pin 18 is fixed at the right end of the top surface of the fixed long plate 17. A second elliptical pin hole is opened at the front end of the reciprocating swing arm 23. The top end of the fixed pin 18 is slidably inserted into the second elliptical pin hole. The fixed pin 18 and the second elliptical pin hole form a limiting function, driving the fixed long plate 17, the square plate 11 and a pair of rectangular plates to reciprocate along the rectangular slot.

[0044] A fixed bracket is fixed in the middle of the right side wall of the rectangular frame 1. A servo motor 2 with its output end facing downward is fixed in the middle of the fixed bracket. A small-diameter pulley is concentrically fixed to the end of the motor shaft of the servo motor 2. A large-diameter pulley is concentrically fixed to the bottom end of the fixed shaft. The small-diameter pulley is synchronously connected to the large-diameter pulley through the drive belt 21. The motor shaft of the servo motor 2 drives the small-diameter pulley to rotate synchronously. The small-diameter pulley drives the large-diameter pulley, the fixed shaft and the turntable 22 to rotate synchronously through the drive belt 21.

[0045] Example 3: Based on Example 2, this example also includes:

[0046] In the specific implementation process, such as Figure 2 and Figure 3 As shown, a first gear ring 13 is concentrically fixed to the lower middle part of the first screen cylinder 12, a first rack 26 is fixed to the rear side of the top surface of the rectangular frame 1, and a pair of rotatably connected first connecting shafts are inserted at the two corners of the rear side of the top surface of the square plate 11. Each first connecting shaft has a first linkage gear 25 concentrically fixed to its top end, and each first linkage gear 25 is meshed with the first gear ring 13 and the first rack 26. When the first screen cylinder 12 moves back and forth, the first linkage gear 25 on it meshes and rotates along the first rack 26, and then meshes and drives the first gear ring 13, the first screen cylinder 12, and the first rotating retaining ring to rotate along the rotating retaining groove.

[0047] The upper middle part of the second screen cylinder 14 is fitted with a second gear ring 15 that is concentrically fixed. The front side of the bottom of the rectangular frame 1 is fixed with a second rack 28. A pair of rotatably connected second shafts are inserted at the two corners of the front side of the bottom of the square plate 11. The bottom end of each second shaft is fitted with a second linkage gear 27 that is concentrically fixed. Each second linkage gear 27 is meshed with the second gear ring 15 and the second rack 28. When the second screen cylinder 14 moves back and forth, the second linkage gear 27 on it meshes and rotates along the second rack 28, and then meshes and drives the second gear ring 15, the second screen cylinder 14, and the second rotating retaining ring to rotate along the rotating retaining groove.

[0048] Specifically, the working principle and operation method of this invention are as follows:

[0049] Step 1: Start the servo motor 2. The motor shaft of the servo motor 2 drives the small diameter pulley to rotate synchronously. The small diameter pulley drives the large diameter pulley, the fixed shaft and the turntable 22 to rotate synchronously through the drive belt 21. The limiting pin 24 and the first elliptical pin hole form a limiting effect, driving the reciprocating swing arm 23 to swing back and forth along the reciprocating pin.

[0050] Step 2: When the reciprocating swing arm 23 swings back and forth, the fixed pin 18 and the second elliptical pin hole form a limiting effect, driving the fixed long plate 17, the square plate 11 and a pair of rectangular plates to slide back and forth along the rectangular slot, and simultaneously driving the first screen cylinder 12 and the second screen cylinder 14 to move back and forth.

[0051] Step 3: When the first screen cylinder 12 reciprocates, the first linkage gear 25 on it meshes and rotates along the first rack 26, and then meshes and drives the first gear ring 13, the first screen cylinder 12, and the first rotating retaining ring to rotate along the rotating retaining groove.

[0052] Step 4: When the second screen cylinder 14 reciprocates, the second linkage gear 27 on it meshes and rotates along the second rack 28, and then meshes and drives the second gear ring 15, the second screen cylinder 14, and the second rotating retaining ring to rotate along the rotating retaining groove.

[0053] Step 5: During the reciprocating translation process, the first screen cylinder 12 and the second screen cylinder 14 always rotate in opposite directions. The negative electrode material is added into the first screen cylinder 12 and preliminarily screened through the coarse particle screen in the first screen cylinder 12. Then, the negative electrode material is screened again through the fine particle screen in the second screen cylinder 14. Finally, the screened negative electrode material falls into the collection box 16.

[0054] This invention solves the problem of poor sieving effect of negative electrode material powder, and adopts a reasonable structural design, which can not only accurately control the particle size of negative electrode material and ensure the stability of product quality, but also automatically complete the sieving process, improve production efficiency and work efficiency, and save labor costs.

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A negative electrode material powder screening all-in-one machine, comprising a rectangular frame (1), four corners of the bottom surface of the rectangular frame (1) are fixedly provided with supporting legs, characterized in that: The rectangular frame (1) is provided with a square plate (11) connected by sliding left and right, a circular through hole is formed in the middle of the square plate (11), a first sieve cylinder (12) is connected by rotating and is clamped in the top of the circular through hole, a second sieve cylinder (14) is connected by rotating and is clamped in the bottom of the circular through hole, and a material collecting box (16) with an open top is placed below the second sieve cylinder (14). A fixed lug seat is fixed on the right side of the rear wall of the rectangular frame (1), a fixed shaft is connected by rotating and is inserted through the front end of the fixed lug seat, a rotating disc (22) is concentrically connected to the top end of the fixed shaft, reciprocating swing arms (23) are suspended in front and back on the rotating disc (22), and the reciprocating swing arms (23) are connected to the square plate (11) through a reciprocating assembly. A pair of symmetrical rectangular clamping grooves are formed in the front and rear walls of the rectangular frame (1), and a pair of symmetrical rectangular clamping plates are fixed on the front and rear walls of the square plate (11), each rectangular clamping plate is clamped in the corresponding rectangular clamping groove. A pair of symmetrical buffer springs are fixed on the left wall of the square plate (11), and the outer ends of the buffer springs are fixed to the left wall of the rectangular frame (1). A first gear ring (13) is concentrically connected to the middle and lower part of the first sieve cylinder (12), a first rack (26) is fixed to the top rear side of the rectangular frame (1), a pair of first connecting shafts are rotatably inserted into the two corners of the top rear side of the square plate (11), the top end of each first connecting shaft is provided with a first linkage gear (25) connected concentrically, and each first linkage gear (25) is connected with the first gear ring (13) and the first rack (26). A second gear ring (15) is concentrically connected to the middle and upper part of the second sieve cylinder (14), a second rack (28) is fixed to the bottom front side of the rectangular frame (1), a pair of second connecting shafts are rotatably inserted into the two corners of the bottom front side of the square plate (11), the bottom end of each second connecting shaft is provided with a second linkage gear (27) connected concentrically, and each second linkage gear (27) is connected with the second gear ring (15) and the second rack (28).

2. The negative material powder and sieve integrated machine according to claim 1, characterized in that: A pair of rotating clamping grooves are formed on the inner ring surface of the circular through hole, a first rotating clamping ring is concentrically connected to the bottom end of the first sieve cylinder (12), and a second rotating clamping ring is concentrically connected to the top end of the second sieve cylinder (14), the first rotating clamping ring and the second rotating clamping ring are sequentially clamped in the pair of rotating clamping grooves.

3. The negative material powder and sieve integrated machine according to claim 2, characterized in that: The rear end of the reciprocating swing arm (23) is provided with a reciprocating shaft, the bottom end of the reciprocating shaft is rotatably inserted into the rectangular frame (1), the middle of the reciprocating swing arm (23) is provided with a first elliptical pin hole, and the top surface of the rotating disc (22) is provided with eccentrically distributed limiting pin shafts (24), the top end of the limiting pin shaft (24) is slidably inserted into the first elliptical pin hole.

4. The negative material powder and sieve integrated machine according to claim 3, characterized in that: The reciprocating assembly comprises a fixed long plate (17) and a fixed pin shaft (18), the right front corner of the square plate (11) is fixedly provided with a transversely distributed fixed long plate (17), the top surface right end of the fixed long plate (17) is fixedly provided with a fixed pin shaft (18), the front end of the reciprocating swing arm (23) is provided with a second elliptical pin hole, and the top end of the fixed pin shaft (18) is slidingly inserted into the second elliptical pin hole.

5. The negative material powder and sieve integrated machine according to claim 4, characterized in that: The middle part of the right side wall of the rectangular frame (1) is fixedly provided with a fixed support, the middle part of the fixed support is fixedly provided with a servo motor (2) with the output end downward, the motor shaft end of the servo motor (2) is sleeved with a concentrically fixed small-diameter pulley, the bottom end of the fixed shaft is sleeved with a concentrically fixed large-diameter pulley, and the small-diameter pulley is synchronously transmissionally connected with the large-diameter pulley through a driving belt (21).

6. The negative material powder and sieve integrated machine according to claim 5, characterized in that: A plurality of uniformly distributed coarse particle sieve holes are formed in the inner bottom wall of the first sieve cylinder (12), and a plurality of uniformly distributed fine particle sieve holes are formed in the inner bottom wall of the second sieve cylinder (14).

7. The powder screening method of the negative material powder screening all-in-one machine according to claim 6, characterized in that, The method comprises the following steps: Step one, start the servo motor (2), the motor shaft of the servo motor (2) drives the small-diameter pulley to synchronously rotate, the small-diameter pulley drives the large-diameter pulley, the fixed shaft and the rotating disc (22) to synchronously rotate through the driving belt (21), the limit pin shaft (24) and the first elliptical pin hole form a limiting action, and the reciprocating swing arm (23) is driven to reciprocate along the reciprocating pin shaft; Step two, when the reciprocating swing arm (23) reciprocates, the fixed pin shaft (18) and the second elliptical pin hole form a limiting action, the fixed long plate (17), the square plate (11) and the pair of rectangular clamping plates are driven to reciprocate along the rectangular clamping groove, and the first sieve cylinder (12) and the second sieve cylinder (14) are synchronously driven to reciprocate; Step three, when the first sieve cylinder (12) reciprocates, the first linkage gear (25) on the first sieve cylinder (12) rotates along the first rack (26), and then the first gear ring (13), the first sieve cylinder (12) and the first rotating clamping ring are driven to rotate along the rotating clamping groove; Step four, when the second sieve cylinder (14) reciprocates, the second linkage gear (27) on the second sieve cylinder (14) rotates along the second rack (28), and then the second gear ring (15), the second sieve cylinder (14) and the second rotating clamping ring are driven to rotate along the rotating clamping groove; Step five, during the reciprocating translation of the first sieve cylinder (12) and the second sieve cylinder (14), the first sieve cylinder (12) and the second sieve cylinder (14) always reciprocate in a positive-negative mode, negative electrode material is added into the first sieve cylinder (12), the negative electrode material is preliminarily screened through the coarse particle sieve holes in the first sieve cylinder (12), and then the negative electrode material is screened again through the fine particle sieve holes in the second sieve cylinder (14), and finally the screened negative electrode material falls into the material collecting box (16).

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