A screening device for battery preparation materials

Abstract

The present invention relates to the technical field of screening materials for battery preparation, and specifically, a screening device for battery preparation materials, comprising a frame and a screening plate, a shaking mechanism is arranged between the frame and the screening plate, and a flipping mechanism is arranged at the bottom of the screening plate; the shaking mechanism causes the screening plate to reciprocate; the flipping mechanism causes the driving wheel fixed to the end of the reciprocating screw to drive the driven wheel connected to the side wall of the frame to rotate, so that the rotating plate connected to the screening plate rotates, thereby separating the large particle raw material from the small particle raw material. Driven by the shaking mechanism, the driven gear rotates intermittently, so that the driven wheel pulls the fixed rod during the rotation process, so that the rotating plate flips while the screening plate shakes, and when the rotating plate tilts toward the lower direction of the screening plate, the large-sized graphene particles originally intercepted by the rotating plate slide to the other side of the rotating plate, and are screened by the large-sized sieve holes, thereby realizing the separation and screening of graphene particles of different sizes.

Description

Technical Field

[0001] The invention relates to the technical field of battery preparation material screening, in particular to a screening device for battery preparation material. Background Art

[0002] A battery is a cup, tank or other container or part of a composite container that contains an electrolyte solution and metal electrodes to generate an electric current. The device that converts into electrical energy has positive and negative electrodes. Using batteries as energy sources, we can obtain electric current with stable voltage, stable current, long-term stable power supply, and little external influence. It plays a great role in all aspects of modern social life. When manufacturing batteries, the preparation materials involve multiple components, including positive electrode materials, negative electrode materials, conductive agents, adhesives, electrolytes, separators and additives, in addition to battery core materials. The screening of battery preparation materials is an important link in the battery manufacturing process. Its main purpose is to ensure the uniformity and refinement of the material particle size. The graphene particles used in the preparation of batteries usually pursue uniform and fine particle shapes to provide a larger electrochemical reaction surface area and better battery performance.

[0003] The patent authorized by China with the announcement number CN114602786B discloses a lithium battery negative electrode material screening device, including a chassis, a box body fixedly installed on the top of the chassis, a screening box movably installed on the top of the box body, and a first vertical block fixedly installed on the left end of the screening box. The above invention, by setting through holes and guide blocks, can make the graphene particles move between the two guide blocks along with the rotation of the screening box. Since the diameter of the through holes distributed on the outer surface of the screening box increases from right to left, the graphene particles with equal diameters can enter the interior of the collection box through the through holes. The device can filter graphene particles with different diameters at the same time, eliminating the secondary screening of graphene particles, thereby reducing the workload of the staff and improving the screening efficiency of the graphene particles by the staff.

[0004] When this patent is in use, as the screening box rotates, the graphene particles inside it move between the two spiral guide blocks and always move at the bottom of the screening box. Through the through holes of different sizes distributed on the outer surface of the guide blocks, the graphene particles leak out of the screening box according to the size of the through holes they reach, and fall into the collecting box below, completing the screening and discharging. However, there is no clear partition between the two guide blocks located inside the screening box, and the diameter of the through holes increases successively in the direction away from the feed pipe. If there are many graphene particles in the screening box, some small particle raw materials may move to the large-sized through holes under the action of the spiral guide blocks before they have time to leak out from the small-sized through holes, thereby causing particle raw materials of different sizes to mix, affecting the screening and classification effect.

[0005] Therefore, the present invention provides a screening device for battery preparation materials. Summary of the invention

[0006] In view of the problem of classification mixing occurring during the screening process in the prior art, the present invention provides a screening device for battery preparation materials.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a screening device for battery preparation materials, comprising a frame and a screening plate, the screening plate is slidably connected to the top of the frame, a shaking mechanism is arranged between the frame and the screening plate, and a flipping mechanism is arranged at the bottom of the screening plate;

[0008] The shaking mechanism is configured to achieve a shaking effect by cooperating the reciprocating screw at the bottom of the screen plate with a slider fixed to the bottom of the screen plate, so that the screen plate performs reciprocating motion;

[0009] The turning mechanism is configured such that, under the drive of the reciprocating screw, the driving wheel fixed to the end of the reciprocating screw drives the driven wheel connected to the side wall of the frame to rotate, and under the action of the connecting rod assembly movably connected to the driven wheel, the rotating plate connected to the screening plate rotates, thereby separating the large particle raw materials from the small particle raw materials;

[0010] The adjustment mechanism located on one side of the driving wheel teeth is equipped to adjust the driven wheel. When the driving wheel rotates, the movable teeth slidingly connected to the driving wheel first engage with the driven wheel, causing the movable teeth to slide and approach the teeth of the driving wheel to avoid tooth jamming between the driving wheel and the driven wheel.

[0011] Preferably, the shaking mechanism also includes a group of limit rods fixedly connected to the frame, the limit rods pass through the bottom of the screen plate, both ends of the reciprocating screw are rotatably connected to the frame, the screen plate is slidably connected to the limit rods, and one end of the reciprocating screw is connected to a drive motor.

[0012] Preferably, the flipping mechanism also includes a first fixed shaft symmetrically arranged and fixedly connected to the side wall of the frame, the driven wheel is rotatably connected to the first fixed shaft, an L-shaped plate is provided at the bottom of the driving wheel and the driven wheel, the L-shaped plate is fixedly connected to the frame, a second fixed shaft is fixedly connected to a side of the driven wheel close to the L-shaped plate, a third fixed shaft is fixedly connected to a side of the L-shaped plate close to the driven wheel, a connecting rod assembly is provided between the second fixed shaft and the third fixed shaft, a one-way bearing is provided between the second fixed shaft and the connecting rod assembly, the rotating plate rotates through the screening plate, and fixed rods are respectively fixedly connected to both ends of the rotating plate, and the fixed rods are provided with through grooves.

[0013] Preferably, the connecting rod assembly includes a first connecting rod rotatably connected to the second fixed shaft, the third fixed shaft is rotatably connected to a group of second connecting rods, the ends between the two second connecting rods are respectively fixedly connected to connecting rods, the connecting rod close to the rotating plate slides through the through slot, and the end of the first connecting rod away from the second fixed shaft is rotatably connected to the end of the second connecting rod away from the fixed rod.

[0014] Preferably, the driving wheel is a non-full gear, and the driving wheel cooperates with the driven wheel.

[0015] Preferably, the adjustment mechanism also includes a slide groove opened on the outer side of the driving wheel, arc grooves are opened on opposite sides of the slide groove, a group of grooves are opened on the side of the slide groove close to the teeth of the driving wheel, a spring is fixedly connected to the bottom of the groove, and a movable tooth is fixedly connected to the end of the spring away from the groove, and both ends of the movable tooth are slidably connected to the arc groove.

[0016] Preferably, the arc groove and the driving wheel have the same center, and the second fixed axis and the first fixed axis do not have the same center.

[0017] Preferably, the initial pitch between the movable tooth and the driving wheel teeth is greater than the self-pitch of the driving wheel teeth. When the movable tooth contacts the side wall of the slide groove on the side close to the groove, the pitch between the movable tooth and the driving tooth teeth is equal to the self-pitch of the driving tooth teeth.

[0018] Preferably, the sieve holes of the sieve plates on both sides of the rotating plate have different sizes, the sieve holes at the bottom are larger than the sieve holes at the top, and a lower hopper is provided at the bottom of the sieve holes of different sizes, and the lower hopper is fixedly connected to the bottom of the sieve plate.

[0019] Beneficial effects of the present invention:

[0020] (1) The screening device for battery preparation materials described in the present invention, driven by a shaking mechanism, causes the driven gear to rotate intermittently, and cooperates with the connecting rod assembly so that the driven wheel pulls the fixed rod during the rotation process, so that the rotating plate flips while the screening plate shakes. When the rotating plate tilts toward the bottom of the screening plate, the large-sized graphene particles originally intercepted by the rotating plate slide to the other side of the rotating plate and are screened by the large-sized sieve holes, thereby realizing the separation and screening of graphene particles of different sizes.

[0021] (2) In the screening device for battery preparation materials described in the present invention, when the driving wheel drives the driven wheel to rotate, the movable teeth slide under the action of the spring according to the contact between the movable teeth and the driven wheel, and automatically adjust their position to mesh with the teeth of the driven wheel, thereby making the driving wheel mesh with the driven wheel to avoid tooth jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 A schematic diagram of the overall mechanism provided by the present invention;

[0024] Figure 2 A schematic diagram of the connection between the frame, the shaking mechanism and the flipping mechanism provided by the present invention;

[0025] Figure 3 A schematic diagram of the bottom of the sieve plate provided by the present invention;

[0026] Figure 4 A schematic diagram of the connection between the frame and the turning mechanism provided by the present invention;

[0027] Figure 5 A schematic diagram of the connection between the shaking mechanism and the flipping mechanism provided by the present invention;

[0028] Figure 6 A schematic diagram of the structure of the flipping mechanism provided by the present invention;

[0029] Figure 7 for Figure 6 A magnified image of point A;

[0030] Figure 8 A connection diagram of the driving wheel and the adjusting mechanism provided by the present invention;

[0031] Fig. 9 A schematic diagram of the connection between the reciprocating screw and the slider provided by the present invention.

[0032] In the figure: 1. frame; 2. screening plate; 3. lower hopper; 4. shaking mechanism; 41. limit rod; 42. reciprocating screw; 43. slider; 5. flip mechanism; 51. driving wheel; 52. first fixed shaft; 53. driven wheel; 54. second fixed shaft; 55. L-shaped plate; 56. third fixed shaft; 57. connecting rod assembly; 571. first connecting rod; 572. second connecting rod; 573. connecting rod; 58. fixed rod; 59. through groove; 510. rotating plate; 511. one-way bearing; 6. adjusting mechanism; 61. slide groove; 62. movable teeth; 63. arc groove; 64. groove; 65. spring. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0034] Example: Figure 1-Figure 9As shown, a screening device for battery preparation materials described in the present invention includes a frame 1 and a screening plate 2, the screening plate 2 is slidably connected to the top of the frame 1, a shaking mechanism 4 is arranged between the frame 1 and the screening plate 2, and a flipping mechanism 5 is arranged at the bottom of the screening plate 2; the shaking mechanism 4 is arranged to cooperate with a slider 43 fixed to the bottom of the screening plate 2 through a reciprocating screw 42 at the bottom of the screening plate 2, so that the screening plate 2 reciprocates to achieve a shaking effect; the flipping mechanism 5 is assembled to drive the reciprocating screw 42 to make the driving wheel 5 fixed to the end of the reciprocating screw 42 1 drives the driven wheel 53 rotatably connected to the side wall of the frame 1 to rotate, and under the action of the connecting rod assembly 57 movably connected to the driven wheel 53, the rotating plate 510 rotatably connected to the screening plate 2 rotates, so that the large particle raw materials are separated from the small particle raw materials; the adjusting mechanism 6 located on the tooth side of the driving wheel 51 is equipped to adjust the driven wheel 53. When the driving wheel 51 rotates, the movable teeth 62 slidably connected to the driving wheel 51 first mesh with the driven wheel 53, so that the movable teeth 62 slide and approach the teeth of the driving wheel 51, so as to avoid the occurrence of stuck teeth between the driving wheel 51 and the driven wheel 53.

[0035] In this embodiment, the driving motor drives the reciprocating screw 42 to rotate, so that the screening plate 2 is always in a shaking state, and the graphene particles are put onto the shaking screening plate 2, shaking and dispersing a large number of particles piled together, thereby enhancing the screening efficiency, and small-sized raw material particles leak out from the small-sized sieve holes, and large-sized raw material particles are temporarily retained on the screening plate 2 under the obstruction of the rotating plate 510. When the reciprocating screw 42 rotates, it drives the driving wheel 51 to rotate, and the driving wheel 51 then drives the driven wheel 53 to rotate intermittently. When the driven wheel 53 rotates, it pulls the connecting rod assembly 57, thereby pulling the fixed rod 58 to rotate the plate 5 The end of 10 rotates about the center of a circle to realize the angle flipping of the rotating plate 510. When the rotating plate 510 rotates toward the lower end of the screening plate 2, the large-sized particle raw materials gradually move along the inclined direction of the rotating plate 510 until they pass over the rotating plate 510 and come to the other side of the rotating plate 510, where they are separated from the small-sized particle raw materials and then enter into another collecting box through the large-sized sieve holes. When the driving wheel 51 rotates, the movable teeth 62 adjust their own position by sliding, so that the teeth of the driving wheel 51 can smoothly mesh with the teeth of the driven wheel 53, thereby avoiding the occurrence of stuck teeth that cause the two to fail to mesh normally.

[0036] In this embodiment, when the angle between the rotating plate 510 and the bottom of the screening plate 2 is the minimum angle, small-sized graphene particles still cannot pass over the rotating plate 510. A collection box can also be placed at the lower end of the screening plate 2 to collect larger-sized particle raw materials that the screening plate 2 cannot screen.

[0037] like Figure 2-Figure 6As shown, the shaking mechanism 4 also includes a group of limit rods 41 fixedly connected to the frame 1, the limit rods 41 pass through the bottom of the screening plate 2, both ends of the reciprocating screw 42 are rotatably connected to the frame 1, the screening plate 2 is slidably connected to the limit rods 41, one end of the reciprocating screw 42 is connected to a driving motor, the flipping mechanism 5 also includes a first fixed shaft 52 symmetrically arranged and fixedly connected to the side wall of the frame 1, the driven wheel 53 is rotatably connected to the first fixed shaft 52, an L-shaped plate 55 is arranged at the bottom of the driving wheel 51 and the driven wheel 53, the L-shaped plate 55 is fixedly connected to the frame 1, a second fixed shaft 54 ​​is fixedly connected to the side of the driven wheel 53 close to the L-shaped plate 55, a third fixed shaft 56 is fixedly connected to the side of the L-shaped plate 55 close to the driven wheel 53, a connecting rod assembly 57 is arranged between the second fixed shaft 54 ​​and the third fixed shaft 56, a one-way bearing 511 is arranged between the second fixed shaft 54 ​​and the connecting rod assembly 57, and the rotating plate 5 10 rotates through the screening plate 2, and fixed rods 58 are fixedly connected at both ends of the rotating plate 510, and the fixed rods 58 are provided with through slots 59. The connecting rod assembly 57 includes a first connecting rod 571 rotatably connected to the second fixed shaft 54, and a group of second connecting rods 572 are rotatably connected to the third fixed shaft 56, and the ends between the two second connecting rods 572 are fixedly connected with connecting rods 573, respectively. The connecting rod 573 close to the rotating plate 510 slides through the through slot 59, and the end of the first connecting rod 571 away from the second fixed shaft 54 ​​is rotatably connected to the end of the second connecting rod 572 away from the fixed rod 58. The driving wheel 51 is a non-full gear, and the driving wheel 51 cooperates with the driven wheel 53. The sieve hole sizes of the screening plates 2 on both sides of the rotating plate 510 are different, and the sieve hole size located at the bottom is larger than the sieve hole size located at the top. A lower hopper 3 is arranged at the bottom of the sieve holes of different sizes, and the lower hopper 3 is fixedly connected to the bottom of the screening plate 2.

[0038] In this embodiment, the driving motor drives the reciprocating screw 42 to rotate, and under the action of the limit rod 41, the slider 43 drives the screening plate 2 to perform a translational reciprocating motion, and the screening plate 2 slides on the limit rod 41 and the reciprocating screw 42, so as to achieve the effect of shaking the screening plate 2. Under the shaking, the accumulated granular raw materials are scattered, so that more sieve holes are used, so as to improve the screening efficiency. The reciprocating screw 42 drives the driving wheel 51 to rotate when rotating, and the driving wheel 51 drives the driven wheel 53 to rotate intermittently. The second fixed shaft 54 ​​on the driven wheel 53 is located at On one side of the center of the driven wheel 53, when the driven wheel 53 rotates, the second fixed shaft 54 ​​rotates with the first fixed shaft 52 as the center, pulling the first connecting rod 571 to move, and pulling the second connecting rod 572 to move during the movement, so that the second connecting rod 572 flips back and forth with the third fixed shaft 56 as the center. Therefore, the connecting rod 573 passing through the through groove 59 on the fixed rod 58 drives the fixed rod 58 to reciprocate when it reciprocates, thereby driving the rotating plate 510 to rotate. During the movement of the connecting rod 573, the connecting rod 573 always slides in the through groove 59.

[0039] In this embodiment, the driving wheel 51 drives the driven wheel 53 to rotate intermittently, so that the rotating plate 510 also rotates intermittently, avoiding continuous high-frequency flipping of the rotating plate 510, and making the screening plate 2 have a certain shaking time, thereby enhancing the screening effect and avoiding the accumulation of raw material particles and the increase in height, which leads to the situation where small-sized particle raw materials pass over the rotating plate 510.

[0040] like Figure 7 and Figure 8 As shown, the adjustment mechanism 6 also includes a slide groove 61 opened on the outer side of the driving wheel 51, and arc grooves 63 are opened on opposite sides of the slide groove 61. A group of grooves 64 are opened on the side of the slide groove 61 close to the teeth of the driving wheel 51, and a spring 65 is fixedly connected to the bottom of the groove 64. The end of the spring 65 away from the groove 64 is fixedly connected to a movable tooth 62, and both ends of the movable tooth 62 are slidably connected to the arc groove 63. The arc groove 63 and the driving wheel 51 are co-centered, and the second fixed shaft 54 ​​and the first fixed shaft 52 are not co-centered. The initial pitch of the movable tooth 62 and the teeth of the driving wheel 51 is greater than the self-pitch of the teeth of the driving wheel 51. When the side of the movable tooth 62 close to the groove 64 contacts the side wall of the slide groove 61, the pitch of the movable tooth 62 and the teeth of the driving teeth is equal to the self-pitch of the teeth of the driving teeth.

[0041] In this embodiment, when the driving wheel 51 rotates, the movable tooth 62 contacts the driven wheel 53 first. Under the rotation of the driving wheel 51, the movable tooth 62 is squeezed, so that the spring 65 is compressed, and the two ends of the movable tooth 62 slide in the arc groove 63. The movable tooth 62 slides in the slide groove 61 at the same time. When the movable tooth 62 can no longer slide, the pitch of the movable tooth 62 and the teeth of the driving wheel 51 is equal to the pitch of the teeth of the driving wheel 51. The arc groove 63 and the driving wheel 51 are concentrically arranged. Therefore, when the spring 65 is compressed and the movable tooth 62 can no longer slide, the movable tooth 62 can adapt to the teeth of the driving wheel 51 to facilitate meshing with the driven wheel 53.

[0042] In this embodiment, technicians in this field can set an openable sealing cover on the outside of the device or place the device in a sealed environment to reduce the impact of dust on the production area according to actual usage scenarios, which is not shown in the figure.

[0043] Working principle: When in use, the driving motor is started to rotate the reciprocating screw 42, so that the screening plate 2 performs uninterrupted reciprocating motion to achieve a shaking effect. When a large number of graphene particles are put onto the upper end of the inclined screening plate 2, the shaking screening plate 2 disperses a large number of graphene particles, thereby accelerating the screening efficiency. Small-sized graphene particles leak out from the small-sized sieve holes and enter the collection box placed under the lower hopper 3. While the reciprocating screw 42 rotates, the driving wheel 51 drives the driven wheel 53 to rotate intermittently. When the driven wheel 53 rotates, it pulls the first connecting rod 571, and the first connecting rod 571 then pulls the second connecting rod 572, thereby When the second connecting rod 572 moves, it pulls the fixed rod 58 fixedly connected to the rotating plate 510. During the rotation of the driven wheel 53, the rotation direction of the first connecting rod 571 is always in the same direction. When the second connecting rod 572 is pulled, the second connecting rod 572 always swings back and forth with the third fixed axis 56 as the center, so that the connecting rod 573 slides in the through groove 59, driving the rotating plate 510 to flip back and forth. When the rotating plate 510 tilts toward the lower end of the screening plate 2, the large-sized graphene particles gradually lose the barrier of the rotating plate 510 until they pass over the rotating plate 510, leak out through the large-sized sieve holes, and enter another collection box.

[0044] When the driving wheel 51 drives the driven wheel 53 to rotate, the movable tooth 62 first contacts with the teeth of the driven wheel 53. When the driving wheel 51 rotates, the movable tooth 62 slides in the slide groove 61 according to the contact with the driven wheel 53, and the spring 65 is compressed, so that the movable tooth 62 meshes with the teeth of the driven wheel 53. When the movable tooth 62 can no longer slide, the pitch of the movable tooth 62 and the teeth of the driving wheel 51 is the same as the pitch of the teeth of the driving wheel 51 itself, so that the driving wheel 51 and the driven wheel 53 can be meshed to avoid tooth jamming. When the movable tooth 62 is separated from the driven wheel 53, the spring 65 is reset to push the movable tooth 62 back to the initial position.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A screening device for battery preparation materials, comprising a frame (1) and a screening plate (2), wherein the screening plate (2) is slidably connected to the top of the frame (1), a shaking mechanism (4) is provided between the frame (1) and the screening plate (2), and a flipping mechanism (5) is provided at the bottom of the screening plate (2), characterized in that: A shaking mechanism (4) is configured to achieve a shaking effect by cooperating a reciprocating screw (42) at the bottom of the screening plate (2) with a slider (43) fixed to the bottom of the screening plate (2); causing the screening plate (2) to reciprocate; The turning mechanism (5) is configured such that, under the drive of the reciprocating screw (42), a driving wheel (51) fixed to the end of the reciprocating screw (42) drives a driven wheel (53) rotatably connected to the side wall of the frame (1) to rotate, and under the action of a connecting rod assembly (57) movably connected to the driven wheel (53), a rotating plate (510) rotatably connected to the screening plate (2) rotates, thereby separating large particle raw materials from small particle raw materials; The adjusting mechanism (6) is located on one side of the teeth of the driving wheel (51) and is configured to adjust the driven wheel (53). When the driving wheel (51) rotates, the movable teeth (62) slidably connected to the driving wheel (51) first mesh with the driven wheel (53), so that the movable teeth (62) slide and approach the teeth of the driving wheel (51), thereby preventing the teeth from being stuck between the driving wheel (51) and the driven wheel (53). The adjustment mechanism (6) further comprises a slide groove (61) formed on the outer side of the driving wheel (51), arc grooves (63) being formed on opposite sides of the slide groove (61), a group of grooves (64) being formed on a side of the slide groove (61) close to the teeth of the driving wheel (51), a spring (65) being fixedly connected to the bottom of the groove (64), one end of the spring (65) away from the groove (64) being fixedly connected to the movable tooth (62), and both ends of the movable tooth (62) being slidably connected to the arc grooves (63).

2. A screening device for battery preparation materials according to claim 1, characterized in that: The shaking mechanism (4) further comprises a set of limit rods (41) fixedly connected to the frame (1), the limit rods (41) passing through the bottom of the screening plate (2), the two ends of the reciprocating screw (42) being rotatably connected to the frame (1), the screening plate (2) being slidably connected to the limit rods (41), and one end of the reciprocating screw (42) being connected to a driving motor.

3. The screening device for battery preparation materials according to claim 1, characterized in that: The tilting mechanism (5) further comprises a first fixed shaft (52) symmetrically arranged and fixedly connected to a side wall of the frame (1); the driven wheel (53) is rotatably connected to the first fixed shaft (52); an L-shaped plate (55) is arranged at the bottom of the driving wheel (51) and the driven wheel (53); the L-shaped plate (55) is fixedly connected to the frame (1); a second fixed shaft (54) is fixedly connected to a side of the driven wheel (53) close to the L-shaped plate (55); a third fixed shaft (56) is fixedly connected to a side of the L-shaped plate (55) close to the driven wheel (53); a connecting rod assembly (57) is arranged between the second fixed shaft (54) and the third fixed shaft (56); a one-way bearing (511) is arranged between the second fixed shaft (54) and the connecting rod assembly (57); the rotating plate (510) rotatably penetrates the screening plate (2); fixed rods (58) are fixedly connected to both ends of the rotating plate (510); and the fixed rods (58) are provided with through slots (59).

4. The screening device for battery preparation materials according to claim 3, characterized in that: The connecting rod assembly (57) comprises a first connecting rod (571) rotatably connected to the second fixed shaft (54); the third fixed shaft (56) is rotatably connected to a group of second connecting rods (572); the ends between two of the second connecting rods (572) are respectively fixedly connected to connecting rods (573); the connecting rod (573) close to the rotating plate (510) slides through the through slot (59); and one end of the first connecting rod (571) away from the second fixed shaft (54) is rotatably connected to one end of the second connecting rod (572) away from the fixed rod (58).

5. The screening device for battery preparation materials according to claim 3, characterized in that: The driving wheel (51) is a non-full gear, and the driving wheel (51) cooperates with the driven wheel (53).

6. The screening device for battery preparation materials according to claim 3, characterized in that: The arc groove (63) and the driving wheel (51) are co-centered, and the second fixed shaft (54) and the first fixed shaft (52) are not co-centered.

7. The screening device for battery preparation materials according to claim 5, characterized in that: The initial tooth pitch between the movable tooth (62) and the teeth of the driving wheel (51) is greater than the inherent tooth pitch of the teeth of the driving wheel (51); when the side of the movable tooth (62) close to the groove (64) contacts the side wall of the slide groove (61), the tooth pitch between the movable tooth (62) and the teeth of the driving tooth is equal to the inherent tooth pitch of the teeth of the driving tooth.

8. The screening device for battery preparation materials according to claim 1, characterized in that: The sieve holes of the sieve plates (2) on both sides of the rotating plate (510) have different sizes, the size of the sieve holes at the bottom being larger than the size of the sieve holes at the top, and a lower hopper (3) is provided at the bottom of the sieve holes of different sizes, and the lower hopper (3) is fixedly connected to the bottom of the sieve plate (2).

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