Crushing and screening device for negative electrode material

Abstract

The utility model discloses a cathode material smashing and screening device which comprises a screening bin, a screening mechanism and a knocking mechanism, the screening mechanism comprises a screening cylinder assembly and a rotating shaft assembly, the screening cylinder assembly is rotatably installed in the screening bin, and the screening cylinder assembly screens cathode materials located in a cylindrical cavity in the screening cylinder assembly step by step; the screening barrel assembly is arranged in the screening bin, the rotating shaft assembly is arranged in the screening barrel assembly in a penetrating mode, the rotating shaft assembly extends outwards from the interior of the screening barrel assembly, the rotating shaft assembly spirally extrudes a negative electrode material in the screening barrel assembly for conveying, and the knocking mechanism is arranged in the screening bin and intermittently knocks and vibrates the screening barrel assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of screening devices, in particular to a negative electrode material crushing and screening device. Background Art

[0002] The crushing of negative electrode materials is an important step to improve the performance and production efficiency of lithium-ion batteries. The crushed negative electrode materials can be better mixed with other materials, making it easier to prepare electrode sheets or other battery components, and can also increase reaction activity and improve rate performance. However, in actual production, due to incomplete crushing, large particles of raw materials are mixed, which makes it difficult to screen large particles and powders, resulting in low uniformity of the crushed raw materials, affecting subsequent use.

[0003] A Chinese utility model with application number CN202222289501.9 discloses a screening device for processing graphite negative electrode materials, including a No. 1 base, a No. 2 base, a No. 3 base, a transmission cylinder, a spiral auger, and a motor. The No. 1 base and the No. 2 base are respectively installed at the bottom of both ends of the transmission cylinder, and the spiral auger is rotatably arranged in the transmission cylinder. The No. 3 base is installed on one side of the No. 1 base, and the motor is installed on the top of the No. 3 base, and the output shaft of the motor is fixedly connected to the shaft end of the spiral auger through a coupling. A feed hopper is installed at the top of one end of the transmission cylinder close to the motor, and a discharge pipe is provided at the bottom of the other end of the transmission cylinder. The utility model can realize four-stage screening of graphite negative electrode materials, which is convenient for subsequent processing. At the same time, the screen can be disassembled, replaced, cleaned and maintained.

[0004] However, the utility model applicant found that the equipment had the following problems: after the screen has been working for too long, the filter holes on the screen will be blocked, and the machine needs to be stopped for inspection and cleaning; even if manual disassembly and cleaning are carried out after the shutdown, the need for regular cleaning will increase the workload and reduce work efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a negative electrode material crushing and screening device in view of the deficiencies of the prior art. The device provides a negative electrode material crushing and screening device, which solves the problem of negative electrode material jamming by arranging the screen as a screening drum assembly and screening the negative electrode material step by step through the apertures of different screening holes connected in sequence. At the same time, the screening drum assembly is rotatably arranged, and a knocking mechanism is also provided on the upper part.

[0006] To solve the above technical problems, the technical solution adopted by the present utility model is as follows: A crushing and screening device for negative electrode materials, comprising a screening bin, a screening mechanism and a knocking mechanism. The screening mechanism includes a screening cylinder assembly and a rotating shaft assembly. The screening cylinder assembly is rotatably installed inside the screening bin. The screening cylinder assembly performs step-by-step screening on the negative electrode materials located in its internal cylindrical cavity. The rotating shaft assembly penetrates through the screening cylinder assembly and extends outward from the screening cylinder assembly. The rotating shaft assembly spirally extrudes the negative electrode materials inside the screening cylinder assembly for transportation. The knocking mechanism is arranged inside the screening bin, and the knocking mechanism intermittently knocks and vibrates the screening cylinder assembly.

[0007] As a preference, the screening cylinder assembly includes a first screening cylinder, a second screening cylinder, a third screening cylinder and a discharge cylinder that are coaxially and sequentially connected. The negative electrode materials are input from the first screening cylinder and are sequentially screened by the first screening cylinder, the second screening cylinder and the third screening cylinder, and then output from the discharge cylinder. A number of first screening holes are evenly distributed on the side wall of the first screening cylinder. A number of second screening holes are evenly distributed on the side wall of the second screening cylinder. A number of third screening holes are evenly distributed on the side wall of the third screening cylinder. A number of discharge ports are arranged in an array on the side wall of the discharge cylinder, and the discharge ports discharge the remaining negative electrode materials after filtration.

[0008] As a preference, the relationship between the aperture φ1 of the first screening holes, the aperture φ2 of the second screening holes and the aperture φ3 of the third screening holes satisfies: φ1 < φ2 < φ3.

[0009] As a preference, the open end of the first screening cylinder is covered with an end cap, which is fixedly connected to the screening bin, and a feed port communicating with the first screening cylinder is opened on the end cap.

[0010] As a preference, the screening mechanism further includes: a gear ring, a rotating motor, a gear and a mounting seat. The gear ring is sleeved on the screening cylinder assembly. The rotating motor is installed on the mounting seat above the screening cylinder assembly. The rotating motor drives the screening cylinder assembly to rotate through the gear meshing with the gear ring.

[0011] As a preference, the rotating shaft assembly includes a driving member and a rotating shaft. The driving member is installed outside the screening bin through a base. The rotating shaft penetrates through the screening cylinder assembly and is connected to the driving member. The rotating shaft is driven by the driving member to rotate in the opposite direction to the screening cylinder assembly. A number of spiral blades are fixedly arranged on the rotating shaft, and the spiral blades follow the rotation of the rotating shaft to push the negative electrode materials to move.

[0012] As a preference, the knocking mechanism includes a bracket, a swing arm, a first connecting rod, a second connecting rod and a universal joint. The bracket is fixedly arranged on the screening bin. The swing arm is rotatably arranged on the bracket and is located above the screening cylinder assembly. The swing arm rotates and swings around the hinge of the bracket to knock on the screening cylinder assembly. The upper end of the first connecting rod is hinged to the swing arm, and the lower end of the first connecting rod is rotatably connected to the universal joint. One end of the second connecting rod is hinged to the first connecting rod through the universal joint, and the other end of the second connecting rod is eccentrically and rotatably connected to the rotating shaft.

[0013] As a preference, a plurality of rubber elastic pads are arranged at the parts where the swing arm abuts and knocks on the screening cylinder assembly, and the rubber elastic pads are made of rubber material.

[0014] As a preference, the top of the screening bin is open, and a flip cover is arranged at the top opening of the screening bin.

[0015] As a preference, a plurality of material boxes are arranged at the bottom of the screening bin, and the material boxes are respectively located below the first screening cylinder, the second screening cylinder, the third screening cylinder and the discharge cylinder.

[0016] The beneficial effects of the utility model are as follows:

[0017] 1. By arranging a rotating screening cylinder assembly to screen the negative electrode material in its internal cylindrical cavity step by step, and the screening cylinder assembly can automatically discharge materials when it rotates to the upper part, the problem of material jamming is solved, and the working efficiency is improved.

[0018] 2. By arranging a rotating shaft assembly with a rotation direction opposite to that of the screening cylinder assembly, the relative movement between the negative electrode material and the screening cylinder assembly is intensified, and the efficiency of the filtering work is further improved.

[0019] 3. By arranging a knocking mechanism to intermittently knock and vibrate the screening cylinder assembly following the rotation of the main shaft, the problem of material jamming is solved, the failure rate caused by material jamming is reduced, and the working efficiency is improved again.

[0020] 4. By arranging a flip cover, the maintenance and repair work of the screening cylinder assembly in the device is more convenient.

[0021] In summary, the device has the advantages of high efficiency, low failure rate, convenient maintenance and repair, etc., and is especially suitable for the technical field of screening devices. Description of the Drawings

[0022] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of a negative electrode material crushing and screening device;

[0024] Figure 2 It is Figure 1 The partial enlarged view at A in

[0025] Figure 3 It is a schematic structural diagram of the screening mechanism;

[0026] Figure 4 It is a schematic structural diagram of the screening cylinder assembly;

[0027] Figure 5 It is a schematic structural diagram of the rotating shaft assembly;

[0028] Figure 6 It is Figure 5 The partial view at B in

[0029] Figure 7 It is a schematic structural diagram of the knocking mechanism;

[0030] Figure 8 It is Figure 7 The partial enlarged view at C in

[0031] Figure 9 It is Figure 7 The partial enlarged view at D in

[0032] Figure 10 It is a schematic diagram of the universal joint structure;

[0033] Figure 11 It is a schematic diagram of the end cover structure.

[0034] Attachment markings: 1. Screening bin; 11. Bin cover; 12. Feed box; 2. Screening mechanism; 21. Screening cylinder assembly; 211. First screening cylinder; 2111. First screening holes; 212. Second screening cylinder; 2121. Second screening holes; 213. Third screening cylinder; 2131. Third screening holes; 214. Discharge cylinder; 2141. Discharge port; 215. End cover; 2151. Feed port; 22. Rotating shaft assembly; 221. Driving part; 222. Rotating shaft; 2221. Spiral blades; 223. Base; 23. Gear ring; 24. Rotating motor; 25. Gear; 3. Knocking mechanism; 31. Bracket; 32. Swing arm; 321. Rubber elastic pad; 33. First connecting rod; 34. Second connecting rod; 35. Universal joint; Specific embodiments

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0038] Embodiment 1:

[0039] As Figures 1 to 10 shown, a negative electrode material crushing and screening device includes a screening bin 1, a screening mechanism 2 and a knocking mechanism 3. The screening mechanism 2 includes a screening cylinder assembly 21 and a rotating shaft assembly 22. The screening cylinder assembly 21 is rotatably installed inside the screening bin 1. The screening cylinder assembly 21 performs step-by-step screening on the negative electrode material located in its inner cylindrical cavity. The rotating shaft assembly 22 passes through the screening cylinder assembly 21 and extends outward from the screening cylinder assembly 21. The rotating shaft assembly 22 spirally extrudes the negative electrode material inside the screening cylinder assembly 21 for conveying. The knocking mechanism 3 is arranged inside the screening bin 1, and the knocking mechanism 3 intermittently knocks and vibrates the screening cylinder assembly 21.

[0040] As Figure 3, as shown in Fig. 4, the screening cylinder assembly 21 includes a first screening cylinder 211, a second screening cylinder 212, a third screening cylinder 213 and a discharge cylinder 214 which are coaxially and sequentially connected. The negative electrode material is input from the first screening cylinder 211, and after being sequentially screened by the first screening cylinder 211, the second screening cylinder 212 and the third screening cylinder 213, it is output from the discharge cylinder 214. A plurality of first screening holes 2111 are evenly distributed on the side wall of the first screening cylinder 211, a plurality of second screening holes 2121 are evenly distributed on the side wall of the second screening cylinder 212, a plurality of third screening holes 2131 are evenly distributed on the side wall of the third screening cylinder 213, and a plurality of discharge ports 2141 are arranged in an array on the side wall of the discharge cylinder 214, and the discharge ports 2141 discharge the remaining negative electrode material after filtration.

[0041] As Figure 3 , as shown in Fig. 4, the relationship between the aperture φ1 of the first screening hole 2111, the aperture φ2 of the second screening hole 2121 and the aperture φ3 of the third screening hole 2131 satisfies: φ1 < φ2 < φ3.

[0042] It is worth mentioning here that by sequentially arranging the first screening holes 2111, the second screening holes 2121 and the third screening holes 2131 with increasing apertures, multi-stage screening of the negative electrode material is realized, which is convenient for subsequent processing.

[0043] As Figure 1 , as shown in Figs. 3 and 11, the open end of the first screening cylinder 211 is covered with an end cap 215, which is fixedly connected to the screening bin 1, and a feed port 2151 communicating with the first screening cylinder 211 is provided on the end cap 215.

[0044] It should be noted here that there is a step on the end cap 215, and a bearing is directly provided between the open end of the first screening cylinder 211 and the step on the end cap 215.

[0045] As Figure 1 , as shown in Fig. 2, the screening mechanism 2 further includes: a gear ring 23, a rotary motor 24, a gear 25 and a mounting seat 26. The gear ring 23 is sleeved on the screening cylinder assembly 21, the rotary motor 24 is installed on the mounting seat 26 above the screening cylinder assembly 21, and the rotary motor 24 drives the screening cylinder assembly 21 to rotate through the gear 25 meshing with the gear ring 23.

[0046] It is worth mentioning here that by setting a rotating screening cylinder assembly to perform step-by-step screening on the negative electrode material located in its internal cylindrical cavity, and the screening cylinder assembly can automatically discharge materials when it rotates to the upper part, the problem of material jamming is solved and the working efficiency is improved.

[0047] As Figure 3, As shown in Fig. 0.5, the rotating shaft assembly 22 includes a driving member 221 and a rotating shaft 222. The driving member 221 is installed outside the screening bin 1 through a base 223. The rotating shaft 222 penetrates through the screening cylinder assembly 21. The rotating shaft 222 is connected to the driving member 221, and the rotating shaft 222 is driven by the driving member 221 to rotate in the opposite direction to the screening cylinder assembly 21. A plurality of spiral blades 2221 are fixedly arranged on the rotating shaft 222, and the spiral blades 2221 follow the rotation of the rotating shaft 222 to push the negative electrode material to move.

[0048] It is worth mentioning here that by setting the rotating shaft assembly 22 with a rotation direction opposite to that of the screening cylinder assembly 21, the relative movement between the negative electrode material and the screening cylinder assembly 21 is more intense under the push of the spiral blades 2221, further improving the efficiency of the filtering work.

[0049] As Figures 6 to 10 shown, the knocking mechanism 3 includes a bracket 31, a swing arm 32, a first connecting rod 33, a second connecting rod 34 and a universal joint 35. The bracket 31 is fixedly arranged on the screening bin 1. The swing arm 32 is rotatably arranged on the bracket 31, and the swing arm 32 is located above the screening cylinder assembly 21. The swing arm 32 rotates and swings around the hinge of the bracket 31 to knock on the screening cylinder assembly 21. The upper end of the first connecting rod 33 is hinged to the swing arm 32, and the lower end of the first connecting rod 33 is rotatably connected to the universal joint 35. One end of the second connecting rod 34 is hinged to the first connecting rod 33 through the universal joint 35, and the other end of the second connecting rod 34 is eccentrically rotatably connected to the rotating shaft 222.

[0050] As Figure 7 , As shown in Fig. 0.8, a plurality of rubber elastic pads 321 are arranged at the parts where the swing arm 32 abuts and knocks on the screening cylinder assembly 21. The rubber elastic pads 321 are made of rubber material.

[0051] It is worth mentioning here that by setting the knocking mechanism, the screening cylinder assembly is intermittently knocked and vibrated following the rotation of the main shaft, solving the problem of material jamming, reducing the failure rate caused by material jamming, and improving the working efficiency again. The rubber elastic pads 321 made of rubber material have good elasticity and play a role of buffering and protecting when knocking on the screening cylinder assembly 21.

[0052] As Figure 1 shown, the top of the screening bin 1 is provided with an opening, and a flipped bin cover 11 is arranged at the top opening of the screening bin 1.

[0053] It is worth mentioning here that by setting the flip-up bin cover 11, dust pollution is reduced during the operation of the device, and it can be conveniently opened when needed for internal maintenance.

[0054] As Figure 1 shown, a plurality of material boxes 12 are provided at the bottom of the screening bin 1, and the material boxes 12 are respectively located below the first screening cylinder 211, the second screening cylinder 212, the third screening cylinder 213 and the discharge cylinder 214.

[0055] It is worth mentioning here that by providing a plurality of material boxes 12, it is convenient to separately collect the anode materials with different particle sizes screened out by the screening cylinder assembly 21.

[0056] The working process is as follows:

[0057] When the start switch of the device is turned on, the rotary motor 24 starts and drives the screening cylinder assembly 21 to rotate through the gear 25 and the gear ring 23. The driving member 221 located outside the screening bin 1 drives the rotating shaft 222 to rotate. The rotating direction of the rotating shaft 222 is opposite to that of the screening cylinder assembly 21. The anode material enters the inner cylindrical cavity of the screening cylinder assembly 21 from the feed port 2151 on the end cover 215. The spiral blade 2221 on the rotating shaft 222 rotates with the rotating shaft 222 and pushes the anode material towards the discharge port 2141. The anode materials with different particle sizes respectively fall into the lower material boxes 12 when passing through the first screening cylinder 211, the second screening cylinder 212 and the third screening cylinder 213 in sequence from small to large. The remaining anode material after filtration is discharged from the discharge port 2141 of the discharge cylinder 214 and falls into the material box.

[0058] In the knocking mechanism 3, the second connecting rod 34 is eccentrically rotatably connected to the rotating shaft 222. When the rotating shaft rotates, the second connecting rod 34 drives the first connecting rod 33 to move up and down, and at the same time drives the swing arm 32 to rotate and swing around the hinge of the support 31, so that the rubber elastic pad 321 knocks on the screening cylinder assembly 21 to knock the stuck anode material back into the cylindrical cavity by vibration.

[0059] The above are only the preferred embodiments of the present utility model and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A negative electrode material crushing and screening device, comprising a screening bin (1), characterized in that: Also includes: Screening mechanism (2) and knocking mechanism (3); The screening mechanism (2) comprises a screening drum assembly (21) and a rotating shaft assembly (22); the screening drum assembly (21) is rotatably mounted inside the screening bin (1); the screening drum assembly (21) screens the negative electrode material in the cylindrical cavity inside the screening drum assembly (21) step by step; the rotating shaft assembly (22) is inserted into the screening drum assembly (21); the rotating shaft assembly (22) extends outward from the inside of the screening drum assembly (21); the rotating shaft assembly (22) spirally squeezes the negative electrode material in the screening drum assembly (21) for transportation; The knocking mechanism (3) is arranged in the screening bin (1), and the knocking mechanism (3) intermittently knocks and vibrates the screening cylinder assembly (21).

2. The negative electrode material crushing and screening device according to claim 1, characterized in that: The screening cylinder assembly (21) comprises a first screening cylinder (211), a second screening cylinder (212), a third screening cylinder (213) and a discharge cylinder (214) which are coaxially connected in sequence; the negative electrode material is input from the first screening cylinder (211), and is screened by the first screening cylinder (211), the second screening cylinder (212) and the third screening cylinder (213) in sequence before being output from the discharge cylinder (214); A plurality of first sieve holes (2111) are evenly distributed on the side wall of the first sieve cylinder (211), a plurality of second sieve holes (2121) are evenly distributed on the side wall of the second sieve cylinder (212), a plurality of third sieve holes (2131) are evenly distributed on the side wall of the third sieve cylinder (213), and a plurality of discharge ports (2141) are arranged in an array on the side wall of the discharge cylinder (214), and the discharge ports (2141) discharge negative electrode materials remaining after filtration.

3. The negative electrode material crushing and screening device according to claim 2, characterized in that: The relationship between the aperture φ1 of the first sieve hole (2111), the aperture φ2 of the second sieve hole (2121), and the aperture φ3 of the third sieve hole (2131) satisfies: φ1<φ2<φ3.

4. The negative electrode material crushing and screening device according to claim 2, characterized in that: The open end of the first screening cylinder (211) is covered with an end cover (215), the end cover (215) is fixedly connected to the screening bin (1), and a feed port (2151) communicating with the first screening cylinder (211) is provided on the end cover (215).

5. The negative electrode material crushing and screening device according to claim 1, characterized in that: The screening mechanism (2) further comprises: A ring gear (23), a rotating motor (24), a gear (25) and a mounting seat (26); The gear ring (23) is sleeved on the screening cylinder assembly (21); The rotating motor (24) is mounted on a mounting seat (26) above the screening drum assembly (21); the rotating motor (24) meshes with the gear ring (23) via the gear (25) to drive the screening drum assembly (21) to rotate.

6. The negative electrode material crushing and screening device according to claim 1, characterized in that: The rotating shaft assembly (22) comprises a driving member (221) and a rotating shaft (222); The driving member (221) is mounted on the outside of the screening bin (1) via a base (223); The rotating shaft (222) is inserted into the screening drum assembly (21), the rotating shaft (222) is connected to the driving member (221), and the rotating shaft (222) is driven by the driving member (221) to rotate in the opposite direction to the screening drum assembly (21), and a plurality of spiral blades (2221) are fixedly arranged on the rotating shaft (222), and the spiral blades (2221) rotate with the rotating shaft (222) to push the negative electrode material to move.

7. The negative electrode material crushing and screening device according to claim 1, characterized in that: The striking mechanism (3) comprises a bracket (31), a swing arm (32), a first connecting rod (33), a second connecting rod (34) and a universal joint (35); The bracket (31) is fixedly arranged on the screening bin (1); The swing arm (32) is rotatably disposed on the bracket (31), and the swing arm (32) is located above the screening drum assembly (21). The swing arm (32) rotates and swings around a hinge of the bracket (31) to strike the screening drum assembly (21); The upper end of the first connecting rod (33) is hingedly connected to the swing arm (32), and the lower end of the first connecting rod (33) is rotatably connected to the universal joint (35); One end of the second connecting rod (34) is hinged to the first connecting rod (33) via the universal joint (35), and the other end of the second connecting rod (34) is eccentrically rotatably connected to the rotating shaft (222).

8. The negative electrode material crushing and screening device according to claim 7, characterized in that: A plurality of rubber spring pads (321) are provided at the locations where the swing arm (32) contacts and strikes the screening drum assembly (21), and the rubber spring pads (321) are made of rubber material.

9. The negative electrode material crushing and screening device according to claim 1, characterized in that: The top of the screening bin (1) is provided with an opening, and a flip-over bin cover (11) is provided at the top opening of the screening bin (1).

10. The negative electrode material crushing and screening device according to claim 2, characterized in that: A plurality of material boxes (12) are provided at the bottom of the screening bin (1), and the material boxes (12) are respectively located below the first screening cylinder (211), the second screening cylinder (212), the third screening cylinder (213) and the discharge cylinder (214).

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