Pole piece crushing and screening device

Abstract

The utility model provides a pole piece crushing and screening device which comprises a supporting frame assembly, a crushing structure and a screening structure, the crushing structure comprises a crushing cylinder assembly, a grinding assembly and a power assembly, the crushing cylinder assembly comprises an inner cylinder, an outer cylinder and a feeding hopper, the inner cylinder is rotationally connected to the supporting frame assembly, the outer cylinder is provided with a grinding channel, and the grinding channel is communicated with the feeding hopper. The feeding hopper is communicated with the grinding channel, the inner cylinder penetrates through the grinding channel, the grinding assembly comprises a first grinding piece, a second grinding piece and a third grinding piece which are sequentially arranged in a staggered mode in the axial direction of the inner cylinder, the distances between the first grinding piece, the second grinding piece and the third grinding piece and the inner wall of the outer cylinder are gradually reduced, and the output end of the power assembly is connected to the inner cylinder; the screening structure communicates with the grinding channel. The first grinding part, the second grinding part and the third grinding part sequentially grind the pole pieces in a grading mode, the powder yield of the pole pieces is improved, crushed impurity fragments and pole piece powder fall into the screening structure to be separated, and the transportation procedure between crushing and screening is omitted.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery material production, and in particular to a pole piece crushing and screening device. Background Art

[0002] Battery pole pieces are an important component of batteries, also known as battery plates. Battery pole pieces are usually made of metal materials such as lead, copper, zinc or cadmium. Some of these metals, such as cobalt, nickel, lithium, etc., are rare or precious resources. Recycling these metals can save resources and reduce the impact on the environment. During the recycling process, the battery needs to be decomposed and the battery pole pieces broken into small pieces for preliminary sorting and cleaning. These battery pole pieces are about 2 to 3 cm in size and need to be further finely crushed to separate the pole piece powder, so that impurities such as aluminum can be separated by subsequent leaching or extraction methods.

[0003] The existing electrode sheet crushing device uses a cutter to crush the electrode sheets, which makes the crushed electrode sheets coarser, which is not conducive to separating electrode sheet powder with smaller particles, resulting in a low powder output rate of the output electrode sheets. When the electrode sheet powder particles are large, it is not conducive to the subsequent separation of aluminum and other impurities therein by leaching or extraction methods. In the process of fine crushing and screening of the electrode sheets, the electrode sheets need to be finely crushed first, and then the crushed materials are transported to the screening device for screening, resulting in more crushing and screening processes. Utility Model Content

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a pole piece crushing and screening device that improves the powder yield and saves the transportation process between crushing and screening.

[0005] The purpose of this disclosure is achieved through the following technical solutions:

[0006] A pole piece crushing and screening device comprises a support frame assembly, a crushing structure and a screening structure.

[0007] The crushing structure includes a crushing barrel assembly, a grinding assembly and a power assembly, and the crushing barrel assembly includes an inner barrel, an outer barrel and a feed hopper;

[0008] The outer cylinder is fixedly connected to the support frame assembly, one end portion of the inner cylinder is located inside the outer cylinder, and the inner cylinder rotates relative to the outer cylinder under the drive of the power assembly;

[0009] The inner wall of the outer cylinder and the outer wall of the inner cylinder form a grinding channel, and the feed hopper is connected to the grinding channel;

[0010] The grinding assembly comprises a first grinding piece, a second grinding piece and a third grinding piece, the first grinding piece, the second grinding piece and the third grinding piece are connected to the outer peripheral wall of the inner cylinder in sequence, the first grinding piece, the second grinding piece and the third grinding piece are all arranged in the grinding channel, the first grinding piece, the second grinding piece and the third grinding piece are staggered in sequence along the axial direction of the inner cylinder, and the distances between the first grinding piece, the second grinding piece and the third grinding piece and the inner wall of the outer cylinder are gradually reduced;

[0011] The screening structure is connected to the grinding channel, and is used for screening materials with different particle sizes.

[0012] In one embodiment, the support frame assembly includes a support rod, a fixed plate, a support plate and a rotating connection piece, the number of the support rods is multiple, the multiple support rods are arranged at intervals, the support plate is connected to the multiple support rods, the fixed plate is connected to the tops of the multiple support rods, the power assembly is connected to the fixed plate, the outer cylinder is connected to the support plate, and the inner cylinder is rotatably connected to the rotating connection piece.

[0013] In one embodiment, the power assembly includes a driving motor, a first roller, a rotating belt and a second roller, the driving motor is connected to the fixed plate, the first roller is connected to the output end of the driving motor, the second roller is sleeved on the inner cylinder, and the rotating belt is sequentially sleeved on the first roller and the second roller.

[0014] In one embodiment, the diameter of the first roller is smaller than the diameter of the second roller.

[0015] In one embodiment, the number of the first grinding member, the second grinding member and the third grinding member are all multiple, and the multiple first grinding members, multiple second grinding members and multiple third grinding members are arranged at intervals along the circumference of the inner cylinder.

[0016] In one embodiment, the first grinding member, the second grinding member and the third grinding member are all inclined to the vertical direction of the inner cylinder.

[0017] In one embodiment, the screening structure includes a screening bin, a spring seat assembly, a vibration assembly and a screen plate, the screening bin is installed on the spring seat assembly, the vibration assembly is connected to the screening bin, the screening bin is provided with a feeding channel, the feeding channel is connected to the grinding channel, the screen plate is arranged in the feeding channel, and the screen plate separates the feeding channel into a slag chamber and a powder chamber.

[0018] In one embodiment, the screening structure also includes a discharge pipe, the screening bin is also provided with a slag outlet and a powder outlet, the slag cavity is connected to the slag outlet, the powder cavity is connected to the powder outlet, and the discharge pipe is connected to the powder outlet.

[0019] In one of the embodiments, the screen plate is arranged to be inclined downward along the direction of the slag outlet.

[0020] In one of the embodiments, the spring seat assembly includes an elastic member and a mounting seat, one end of the elastic member abuts against the bottom of the screening bin, and the other end of the elastic member abuts against the mounting seat.

[0021] Compared with the prior art, the present invention has at least the following advantages:

[0022] 1. The above-mentioned pole piece crushing and screening device drives the inner cylinder to rotate on the support frame assembly through the power assembly, and the inner cylinder drives the first grinding piece, the second grinding piece and the third grinding piece to rotate synchronously. The spacing between the first grinding piece, the second grinding piece and the third grinding piece and the inner wall of the outer cylinder gradually decreases, and the pole piece is graded and ground by the first grinding piece, the second grinding piece and the third grinding piece in sequence, so that the particle size of the pole piece powder and impurity fragments broken by the pole piece is smaller, and the particle size of the ground pole piece is changed from large to small, and the pole piece is finely ground, thereby improving the powder output rate of the pole piece, and facilitating the subsequent wet screening of metal elements in the pole piece;

[0023] 2. The first grinding piece, the second grinding piece and the third grinding piece are staggered in sequence along the axial direction of the inner cylinder, which prevents the fragments of the pole piece from falling directly into the screening structure from between the adjacent first grinding piece, the second grinding piece and the third grinding piece, so that the pole piece is more fully ground and the grinding quality of the pole piece is improved;

[0024] 3. After the electrode is crushed into electrode powder and impurity fragments, the electrode powder and impurity fragments enter the screening structure through the grinding channel. The screening structure separates the electrode powder and impurity fragments, saving the transportation process between crushing and screening, and reducing the production cost of crushing and screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of a pole piece breakage screening device according to an embodiment;

[0027] Figure 2 for Figure 1 A cross-sectional view of a pole piece crushing and screening device shown;

[0028] Figure 3 for Figure 1 A schematic diagram of the local structure of the broken structure shown;

[0029] Figure 4 for Figure 1 A partial cross-sectional view of the crushing structure shown.

[0030] Reference numerals: 10-pole piece crushing and screening device; 100-support frame assembly; 110-support rod; 120-fixed plate; 130-support plate; 140-rotating connection member; 200-crushing structure; 210-crushing cylinder assembly; 211-inner cylinder; 212-outer cylinder; 2101-grinding channel; 213-feed hopper; 220-grinding assembly; 221-first grinding member; 222-second grinding member; 223-third grinding member; 230- Power assembly; 231-driving motor; 232-first roller; 233-rotating belt; 234-second roller; 300-screening structure; 310-screening bin; 3101-material passing channel; 3102-slag cavity; 3103-powder cavity; 3104-slag outlet; 3105-powder outlet; 320-spring seat assembly; 321-elastic member; 322-mounting seat; 330-vibration assembly; 340-screen plate; 350-discharging pipe. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0035] like Figures 1 to 4 As shown, a pole piece crushing and screening device 10 according to an embodiment of the present disclosure includes a support frame assembly 100, a crushing structure 200 and a screening structure 300. The crushing structure 200 includes a crushing cylinder assembly 210, a grinding assembly 220 and a power assembly 230. The crushing cylinder assembly 210 includes an inner cylinder 211, an outer cylinder 212 and a feed hopper 213. The inner cylinder 211 is rotatably connected to the support frame assembly 100, and the outer cylinder 212 is fixedly connected to the support frame assembly 100. One end of the inner cylinder 211 is located at the outer cylinder 212. 12, the inner cylinder 211 rotates relative to the outer cylinder 212 under the drive of the power assembly 230, the inner cylinder 211 is rotatably connected to the support frame assembly 100, the output end of the power assembly 230 is connected to the inner cylinder 211, the inner wall of the outer cylinder 212 and the outer wall of the inner cylinder 211 form a grinding channel 2101, the feed hopper 213 is connected to the grinding channel 2101, the feed hopper 213 is connected to the grinding channel 2101, the diameter of the feed hopper 213 is larger than the diameter of the grinding channel 2101, thereby increasing the feeding port of the electrode.

[0036] Furthermore, the grinding assembly 220 includes a first grinding member 221, a second grinding member 222, and a third grinding member 223, which are sequentially connected to the outer peripheral wall of the inner cylinder 211, and the first grinding member 221, the second grinding member 222, and the third grinding member 223 are all arranged in the grinding channel 2101, and the first grinding member 221, the second grinding member 222, and the third grinding member 223 are sequentially staggered along the axial direction of the inner cylinder 211. The distance between the inner wall of the outer cylinder 212 and the outer cylinder 211 gradually decreases, and the particle size of the electrode powder and impurity fragments ground by the first grinding piece, the second grinding piece 222 and the third grinding piece 223 gradually decreases. The inner cylinder 211 can drive the first grinding piece 221, the second grinding piece 222 and the third grinding piece 223 to rotate synchronously. The first grinding piece 221, the second grinding piece 222 and the third grinding piece 223 grind the electrode piece in turn in the grinding channel 2101, so that the particle size of the ground electrode piece changes from large to small, and the electrode piece is finely ground, which is convenient for the subsequent wet screening of metal elements in the electrode piece. The screening structure 300 is connected to the grinding channel 2101, and the screening structure 300 is used to screen materials with different particle sizes.

[0037] In this embodiment, the pole piece enters the grinding channel 2101 of the outer cylinder 212 through the feed hopper 213, the power assembly 230 drives the inner cylinder 211 to rotate on the support frame assembly 100, and the inner cylinder 211 drives the first grinding piece 221, the second grinding piece 222 and the third grinding piece 223 to rotate synchronously. The first grinding piece 221, the second grinding piece 222 and the third grinding piece 223 are staggered in sequence along the axial direction of the inner cylinder 211. When the pole piece falls, it contacts the first grinding piece 221, the second grinding piece 222 and the third grinding piece 223 in sequence. The pole piece is graded and ground by the first grinding piece 221, the second grinding piece 222 and the third grinding piece 223 in sequence, so that the particle size of the broken pole piece powder and impurity fragments of the pole piece is gradually reduced, and the broken pole piece powder and impurity fragments enter the screening structure 300 from the grinding channel 2101, and the screening structure 300 separates the pole piece powder and impurity fragments of different particle sizes.

[0038] The above-mentioned pole piece crushing and screening device 10 drives the inner cylinder 211 to rotate on the support frame assembly 100 through the power assembly 230, and the inner cylinder 211 drives the first grinding member 221, the second grinding member 222 and the third grinding member 223 to rotate synchronously. The distance between the first grinding member 221, the second grinding member 222 and the third grinding member 223 and the inner wall of the outer cylinder 212 is gradually reduced, and the pole pieces are graded and ground by the first grinding member 221, the second grinding member 222 and the third grinding member 223 in sequence, so that the particle size of the ground pole pieces changes from large to small, and the pole pieces are finely ground, thereby improving the powder extraction rate of the pole pieces, and facilitating the subsequent wet screening of the pole pieces. The first grinding piece 221, the second grinding piece 222 and the third grinding piece 223 are staggered in sequence along the axial direction of the inner cylinder 211, which prevents the fragments of the pole piece from falling directly into the screening structure 300 from between the adjacent first grinding piece 221, the second grinding piece 222 and the third grinding piece 223, so that the pole piece is ground more fully and the grinding quality of the pole piece is improved; the impurity fragments and the pole piece powder enter the screening structure 300 through the grinding channel 2101, and then the pole piece powder and the impurity fragments are separated by the screening structure 300, which saves the transportation process between the crushing and screening processes and reduces the production cost of crushing and screening.

[0039] like Figure 1As shown, in one embodiment, the support frame assembly 100 includes a support rod 110, a fixed plate 120, a support plate 130 and a rotating connection member 140. The number of the support rods 110 is multiple, and the multiple support rods 110 are arranged at intervals. The support plate 130 is connected to the multiple support rods 110, the fixed plate 120 is connected to the top of the multiple support rods 110, the power assembly 230 is connected to the fixed plate 120, the outer cylinder 212 is connected to the support plate 130, and the inner cylinder 211 is rotatably connected to the rotating connection member 140. In this embodiment, the support plate 130 can fix the outer cylinder 212, and the multiple support rods 110 can increase the fixing strength of the support plate 130 and the fixed plate 120, so that the connection between the fixed plate 120 and the rotating connection member 140 is more stable, so that the inner cylinder 211 rotating on the rotating connection member 140 is more stable.

[0040] like Figure 2 As shown, in one embodiment, the power assembly 230 includes a driving motor 231, a first roller 232, a rotating belt 233 and a second roller 234, the driving motor 231 is connected to the fixed plate 120, the first roller 232 is rotatably connected to the output end of the driving motor 231, the second roller 234 is sleeved on the inner cylinder 211, and the rotating belt 233 is sequentially sleeved on the first roller 232 and the second roller 234. In this embodiment, the driving motor 231 is started to drive the first roller 232 to rotate, the first roller 232 drives the second roller 234 to rotate through the rotating belt 233, and the second roller 234 drives the inner cylinder 211 to rotate. The rotating belt 233 transmits smoothly during operation, and the rotating belt 233 can buffer and absorb vibration. The rotating belt 233 and the first roller 232 and the second roller 234 are transmitted by friction. When an overload is encountered during operation, the rotating belt 233 will slip to prevent damage to the first roller 232 and the second roller 234, thereby playing a role in safety protection.

[0041] like Figure 2 As shown, in one embodiment, the diameter of the first roller 232 is smaller than the diameter of the second roller 234. In this embodiment, since the number of rotations of the first roller 232 driven by the driving motor 231 is greater than the number of rotations of the second roller 234, the first roller 232 can drive the second roller 234 with a smaller force, so that the torque of the inner cylinder 211 driven by the second roller 234 is larger, and the inner cylinder 211 can smoothly break the pole pieces.

[0042] like Figure 3As shown, in one embodiment, the number of the first grinding member 221, the second grinding member 222 and the third grinding member 223 are all multiple, and the multiple first grinding members 221, the multiple second grinding members 222 and the multiple third grinding members 223 are arranged at intervals along the circumference of the inner cylinder 211. In this embodiment, the multiple first grinding members 221, the multiple second grinding members 222 and the multiple third grinding members 223 can increase the contact with the pole piece, so that the grinding effect of the pole piece is improved, thereby improving the grinding accuracy of the pole piece.

[0043] like Figure 3 As shown, in one embodiment, the first grinding piece 221, the second grinding piece 222 and the third grinding piece 223 are all inclined to the vertical direction of the inner cylinder. In this embodiment, the grinding assembly 220 is inclined along the first grinding piece 221, the second grinding piece 222 and the third grinding piece 223, so that the falling time of the pole piece along the inclined first grinding piece 221, the second grinding piece 222 and the third grinding piece 223 is increased, the grinding time of the pole piece is increased, the pole piece is ground more fully, and the powder discharge rate of the pole piece is further improved.

[0044] like Figure 2 As shown, in one embodiment, the screening structure 300 includes a screening bin 310, a spring seat assembly 320, a vibration assembly 330 and a screen plate 340. The screening bin 310 is installed on the spring seat assembly 320, and the vibration assembly 330 is connected to the outer wall of the screening bin 310. The screening bin 310 is provided with a feeding channel 3102, and the feeding channel 3102 is connected to the grinding channel 2101. The screen plate 340 is arranged in the feeding channel 3102, and the screen plate 340 divides the feeding channel 3102 into a slag cavity 3102 and a powder cavity 3103. In this embodiment, a plurality of sieve holes are provided on the sieve plate 340, and the aperture of the sieve hole is larger than the particle size of the pole piece powder, and the aperture of the sieve hole is smaller than the impurity fragments, so that the pole piece powder can enter the powder cavity 3103 through the sieve hole, and the impurity fragments are screened on the upper surface of the sieve plate 340. The vibration assembly 330 drives the screening bin 310 to vibrate, causing the screen plate 340 to vibrate. The electrode powder on the screen plate 340 enters the powder cavity 3103 under the action of the vibration, and the impurity fragments are screened and remain in the slag cavity 3102 above the screen plate 340, which makes it convenient for the operator to separately collect the electrode powder and impurity fragments in the powder cavity 3103 and the slag cavity 3102.

[0045] like Figure 2As shown, in one embodiment, the screening structure 300 further includes a discharge pipe 350, the screening bin 310 is further provided with a slag outlet 3104 and a powder outlet 3105, the slag cavity 3102 is connected to the slag outlet 3104, the powder cavity 3103 is connected to the powder outlet 3105, and the discharge pipe 350 is connected to the powder outlet 3105. In this embodiment, the outlet end of the discharge pipe 350 can extend the outlet position of the electrode powder, and the discharge pipe 350 is extended into the collection device to prevent the electrode powder from scattering, thereby reducing the waste of the electrode powder.

[0046] like Figure 2 As described above, in one embodiment, the screen plate 340 is tilted downward in the direction of the slag outlet 3103. In this embodiment, the screen plate 340 is tilted downward in the direction of the slag outlet 3103, so that the impurity fragments falling on the surface of the screen plate 340 are guided by gravity. When the screen plate 340 vibrates, the impurity fragments move in the direction of the sliding slag outlet 3103, which facilitates the collection of impurity fragments at the slag outlet 3103.

[0047] like Figure 2 As shown, in one embodiment, the spring seat assembly 320 includes an elastic member 321 and a mounting seat 322, one end of the elastic member 321 abuts against the bottom of the screening bin 310, and the other end of the elastic member 321 abuts against the mounting seat 322. In this embodiment, the elastic member 321 can support the screening bin 310, so that the vibration assembly 330 drives the screening bin 310 to shake, and the number of the elastic member 321 and the mounting seat 322 is multiple, one end of each elastic member 321 is respectively connected to the screening bin 310, and the other end of each elastic member 321 is respectively connected to the corresponding mounting seat 322, and multiple mounting seats 322 are arranged at intervals below the screening bin 310, so that the support force of the screening bin 310 by the multiple elastic members 321 is more uniform.

[0048] Compared with the prior art, the present invention has at least the following advantages:

[0049] 1. The above-mentioned pole piece crushing and screening device 10 drives the inner cylinder 211 to rotate on the support frame assembly 100 through the power assembly 230, and the inner cylinder 211 drives the first grinding member 221, the second grinding member 222 and the third grinding member 223 to rotate synchronously. The distance between the first grinding member 221, the second grinding member 222 and the third grinding member 223 and the inner wall of the outer cylinder 212 is gradually reduced, and the pole piece is graded and ground by the first grinding member 221, the second grinding member 222 and the third grinding member 223 in sequence, so that the particle size of the pole piece powder and impurity fragments of the pole piece crushed is smaller, and the particle size of the ground pole piece is changed from large to small, the pole piece is finely ground, the powder output rate of the pole piece is improved, and it is convenient to screen out the metal elements in the pole piece by wet method later;

[0050] 2. The first grinding piece 221, the second grinding piece 222 and the third grinding piece 223 are sequentially staggered along the axial direction of the inner cylinder 211, so as to prevent the fragments of the pole piece from falling directly into the screening structure 300 from between the adjacent first grinding piece 221, the second grinding piece 222 and the third grinding piece 223, so that the pole piece is ground more fully and the grinding quality of the pole piece is improved;

[0051] 3. After the electrode is crushed into electrode powder and impurity fragments, the electrode powder and impurity fragments enter the screening structure 300 through the grinding channel 2101. The screening structure 300 separates the electrode powder and impurity fragments, saving the transportation process between crushing and screening, and reducing the production cost of crushing and screening.

[0052] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A pole piece crushing screening device, characterized in that: It comprises a support frame assembly (100), a crushing structure (200) and a screening structure (300), The crushing structure (200) comprises a crushing barrel assembly (210), a grinding assembly (220) and a power assembly (230), wherein the crushing barrel assembly (210) comprises an inner barrel (211), an outer barrel (212) and a feed hopper (213); The outer cylinder (212) is fixedly connected to the support frame assembly (100), one end portion of the inner cylinder (211) is located inside the outer cylinder (212), and the inner cylinder (211) rotates relative to the outer cylinder (212) under the drive of the power assembly (230); The inner wall of the outer cylinder (212) and the outer wall of the inner cylinder (211) form a grinding channel (2101), and the feed hopper (213) is connected to the grinding channel (2101); The grinding assembly (220) comprises a first grinding piece (221), a second grinding piece (222) and a third grinding piece (223); the first grinding piece (221), the second grinding piece (222) and the third grinding piece (223) are sequentially connected to the outer peripheral wall of the inner cylinder; the first grinding piece (221), the second grinding piece (222) and the third grinding piece (223) are all arranged in the grinding channel (2101); the first grinding piece (221), the second grinding piece (222) and the third grinding piece (223) are sequentially staggered along the axial direction of the inner cylinder (211); and the distances between the first grinding piece (221), the second grinding piece (222) and the third grinding piece (223) and the inner wall of the outer cylinder (212) gradually decrease; The screening structure (300) is connected to the grinding channel (2101), and the screening structure (300) is used to screen materials with different particle sizes.

2. The pole piece crushing screening device according to claim 1, characterized in that: The support frame assembly (100) comprises a support rod (110), a fixed plate (120), a support plate (130) and a rotating connecting piece (140); the number of the support rods (110) is multiple, and the multiple support rods (110) are arranged at intervals; the support plate (130) is connected to the multiple support rods (110); the fixed plate (120) is connected to the tops of the multiple support rods (110); the power assembly (230) is connected to the fixed plate (120); the outer cylinder (212) is connected to the support plate (130); and the inner cylinder (211) is rotatably connected to the rotating connecting piece (140).

3. The pole piece crushing screening device according to claim 2, characterized in that: The power assembly (230) comprises a driving motor (231), a first roller (232), a rotating belt (233) and a second roller (234); the driving motor (231) is connected to the fixing plate (120); the first roller (232) is connected to the output end of the driving motor (231); the second roller (234) is sleeved on the inner cylinder (211); and the rotating belt (233) is sleeved on the first roller (232) and the second roller (234) in sequence.

4. The pole piece crushing screening device according to claim 3 is characterized in that: The diameter of the first roller (232) is smaller than the diameter of the second roller (234).

5. The pole piece crushing screening device according to claim 1, characterized in that: The number of the first grinding piece (221), the second grinding piece (222) and the third grinding piece (223) is multiple, and the multiple first grinding pieces (221), the multiple second grinding pieces (222) and the multiple third grinding pieces (223) are arranged at intervals along the circumference of the inner cylinder (211).

6. The pole piece crushing screening device according to claim 1, characterized in that: The first grinding piece (221), the second grinding piece (222) and the third grinding piece (223) are all inclined to the vertical direction of the inner cylinder.

7. The pole piece crushing screening device according to claim 1, characterized in that: The screening structure comprises a screening bin (310), a spring seat assembly (320), a vibration assembly (330) and a screening plate (340); the screening bin (310) is installed on the spring seat assembly (320); the vibration assembly (330) is connected to the screening bin (310); the screening bin (310) is provided with a feeding channel (3101); the feeding channel (3101) is connected to the grinding channel (2101); the screening plate (340) is arranged on the feeding channel (3101); the screening plate (340) separates the feeding channel (3101) into a slag cavity (3102) and a powder cavity (3103).

8. The pole piece crushing screening device according to claim 7, characterized in that: The screening structure (300) further includes a discharge pipe (350), and the screening bin (310) is further provided with a slag outlet (3104) and a powder outlet (3105), the slag chamber (3102) is connected to the slag outlet (3104), the powder chamber (3103) is connected to the powder outlet (3105), and the discharge pipe (350) is connected to the powder outlet (3105).

9. The pole piece crushing screening device according to claim 8, characterized in that: The sieve plate (340) is arranged to be tilted downward in the direction of the slag outlet (3104).

10. The pole piece crushing screening device according to claim 7, characterized in that: The spring seat assembly (320) comprises an elastic member (321) and a mounting seat (322), one end of the elastic member (321) abuts against the bottom of the screening bin (310), and the other end of the elastic member (321) abuts against the mounting seat (322).

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