Uniform powder spreading device

Abstract

The utility model relates to a uniform powder spreading device. The powder spreading device comprises a supporting frame, a driving source, a transmission assembly, a first swing roller and a second swing roller, the bottom of the supporting frame is attached to a pressing roller to form a rolling face, a powder falling box corresponding to the rolling face is arranged on the supporting frame, the driving source is arranged on the supporting frame, and the transmission assembly is arranged on the driving source. The first swing roller and the second swing roller are driven by the transmission assembly to roll along the rolling face, and the second swing roller is located on the side, away from the powder falling box, of the first swing roller. The uniform powder spreading device disclosed by the utility model has the advantages of compact structure and uniform coating.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production, and in particular to a powder spreading device. Background Technology

[0002] The coating process is one of the key steps in lithium battery production, generally achieved through wet or dry coating. The dry coating process is as follows: after initial fiberization, the powder falls onto a roller set for pressing, forming an electrode film. This electrode film, combined with the current collector, is then pressed to form the electrode sheet. However, current processes struggle to ensure uniform powder distribution during actual operation. Uneven electrode coating can lead to battery performance degradation, potential short circuits, and even catastrophic battery accidents. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide a powder spreading device, which has the advantages of compact structure and uniform coating.

[0004] A powder spreading device includes: a support frame, a drive source, a transmission component, a first swing roller and a second swing roller. The bottom of the support frame is attached to a pressure roller to form a rolling surface. A powder drop box corresponding to the rolling surface is provided on the support frame. The drive source is provided on the support frame and drives the first swing roller and the second swing roller to roll along the rolling surface through the transmission component. The second swing roller is located on the side of the first swing roller away from the powder drop box.

[0005] The powder spreading device described in this utility model uses a double swing roller structure to coat the powder twice, which can improve the spreading quality while ensuring processing efficiency, thereby obtaining a powder layer with better uniformity.

[0006] Furthermore, the transmission assembly includes a sliding plate, a sliding seat, a first rack, a second rack, a speed ratio component, a rocker arm, and a third rack. The sliding plate is mounted on the support frame and is driven by the drive source to slide along a first direction. The sliding seat is slidably connected to the sliding plate and slides relative to the sliding plate along a second direction. The projections of the first and second directions onto the sliding plate intersect. The first rocker roller is rotatably mounted on the sliding seat and meshes with the first rack mounted on the support frame. The second rack is mounted on the sliding plate. The input end of the speed ratio component meshes with the second rack, and the output end meshes with the rocker arm. The rocker arm is rotatably mounted on the support frame and has a groove. The second rocker roller is slidably mounted in the groove and meshes with the third rack mounted on the support frame. By driving the dual rocker rollers with a single drive source, the device structure can be made more compact, reducing production costs.

[0007] Furthermore, the first and second directions are perpendicular, making the structure compact and simple, and preventing jamming during the operation of the swing roller.

[0008] Furthermore, the bottom of the support frame, the tooth surfaces of the first rack, and the third rack are all arc-shaped with the same curvature. This structure allows for a higher degree of fit between the device and the pressure roller, resulting in better powder layer spreading.

[0009] Furthermore, the speed ratio component is a reduction gear set. This structure allows the second swing roller to have a smaller amplitude and speed than the first swing roller, achieving a more refined secondary spreading of the powder.

[0010] Furthermore, it also includes a guide block disposed on the support frame, the guide block abutting against the side of the second rack away from the tooth surface. This structure ensures stable operation of the device.

[0011] Furthermore, it also includes a rotating shaft, an eccentric wheel, and a bearing. The output end of the drive source drives the rotating shaft to rotate via a synchronous belt. The rotating shaft is rotatably mounted on the support frame. The eccentric wheel is eccentrically mounted on the rotating shaft, and a bearing is sleeved on the outer side of the eccentric wheel. The slide plate has a sliding groove, and the bearing is slidably mounted in the sliding groove along the second direction. Its structure is compact and its operation is stable.

[0012] Furthermore, the transmission assembly also includes a connecting frame, which is connected to the support frame via a first slide rail extending along the first direction. The connecting frame is also connected to the sliding seat via a second slide rail extending along the second direction. The sliding plate is disposed on the connecting frame.

[0013] Furthermore, the transmission components are arranged in two sets symmetrically on both sides of the support frame, with the drive source, the first swing roller, and the second swing roller located between the two sets of transmission components. This structure is compact, operates stably, and reduces the size of the device.

[0014] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is an axial view of the powder spreading device described in this utility model;

[0016] Figure 2 This is a structural diagram of the powder spreading device described in this utility model;

[0017] Explanation of reference numerals in the attached drawings: X, first direction; Y, second direction; 11, mounting bracket; 12, support bracket; 13, powder box; 21, drive source; 22, rotating shaft; 23, eccentric wheel; 24, bearing; 311, first slide rail; 312, second slide rail; 32, slide plate; 321, sliding groove; 33, connecting bracket; 34, sliding seat; 35, speed ratio assembly; 36, swing arm; 37, guide block; 381, first rack; 382, ​​second rack; 383, third rack; 4, first swing roller; 5, second swing roller. Detailed Implementation

[0018] This solution uses a two-stage coating process to ensure uniform powder coating while maintaining the original production efficiency, thereby significantly reducing processing costs.

[0019] Please see Figure 1-2 , Figure 1 This is an axial view of the powder spreading device described in this utility model; Figure 2 This is a structural diagram of the powder spreading device described in this utility model. This utility model discloses a powder spreading device that is attached to the roller surface of a pressure roller to form a rolling surface, where powder falls onto the roller surface of the pressure roller and is spread evenly. The device includes a frame assembly, a drive assembly, a transmission assembly, a first swing roller 4, and a second swing roller 5. The drive assembly is mounted on the frame assembly and drives the first swing roller 4 and the second swing roller 5 to spread and coat the powder evenly through the transmission assembly.

[0020] The frame assembly includes a mounting frame 11, a support frame 12, and a powder collection box 13. The mounting frame 11 is used to connect the device to external equipment. The support frame 12 is fixedly mounted on the mounting frame 11 and has a receiving space in the middle. The bottom of the support frame 12 is in contact with the roller surface of the pressure roller, and its bottom surface is an arc-shaped surface adapted to the roller surface of the pressure roller. The powder collection box 13 is disposed in the receiving space and connected to the mounting frame 11. The top of the powder collection box 13 has a feed port, and the bottom has a discharge port corresponding to the roller surface of the pressure roller.

[0021] The drive assembly includes a drive source 21, a rotating shaft 22, eccentric wheels 23, and bearings 24. The drive source 21 can have various structural forms, such as a motor or a cylinder. Multiple drive sources 21 can also exist, each driving the first swing roller 4 and the second swing roller 5 to rotate around their own axes. In this embodiment, the drive source 21 is a servo rotary motor, mounted on the support frame 12. The output of the servo rotary motor drives the rotating shaft 22 to rotate via a synchronous belt. The rotating shaft 22 is rotatably mounted on the support frame 12, with eccentric wheels 23 eccentrically mounted at both ends relative to the axis of the rotating shaft 22. Bearings 24 are fitted around the outer sides of the eccentric wheels 23.

[0022] Two transmission components are located on either side of the drive component, including a slide plate 32, a connecting frame 33, a sliding seat 34, a speed ratio component 35, a rocker arm 36, and a guide block 37. Symmetrically arranged on both sides of the support frame 12 are first slide rails 311 extending along a first direction X. The tracks of the first slide rails 311 are mounted on the support frame 12. Two slide plates 32 are respectively mounted on both sides of the support frame 12 and connected to the sliders of the first slide rails 311 via a connecting frame 33. The drive source 21 drives the slide plates 32 to slide along the first direction X. A sliding groove 321 cooperating with a bearing 24 is provided in the middle of the slide plate 32. The extending direction of the sliding groove 321 intersects the extending direction of the first slide rail 311, preferably perpendicular to the first slide rail 311. When the shaft 22 rotates, it drives the eccentric wheel 23 to rotate around the axis of the shaft 22. This circular motion can be decomposed into vertical motion and horizontal motion. Therefore, while the bearing 24 slides up and down in the sliding groove 321, the slide plate 32 can drive the connecting frame 33 to reciprocate along the first slide rail 311. The other side of the connecting frame 33 is connected to the sliding seat 34 through the second slide rail 312. The second slide rail 312 extends along the second direction Y. The projections of the first direction X and the second direction Y on the slide plate 32 intersect, preferably perpendicular to each other, so that the sliding seat 34 can move up and down relative to the connecting frame 33.

[0023] The first swing roller 4 is rotatably mounted on the sliding seat 34 at both ends. Each end of the first swing roller 4 is also provided with a first meshing tooth along its circumference. A first rack 381 is also provided at the bottom of the support frame 12, meshing with the first meshing teeth. The first rack 381 is arc-shaped with the same curvature as the rolling surface. When the sliding seat 34 slides with the connecting frame 33 and the sliding plate 32, it drives the first swing roller 4 to move along the arc of the first rack 381. The sliding seat 34 can move up and down relative to the connecting frame 33 via the second slide rail 312. Simultaneously, because the first rack 381 meshes with the first meshing teeth, the first swing roller 4 will also rotate around its axis during movement, thereby achieving the first even spreading of the powder.

[0024] The front end of the slide plate 32 is also provided with a second rack 382, ​​which is parallel to the first slide rail 311. The support frame 12 is provided with a guide block 37 that abuts against the top of the second rack 382 (i.e., the side away from the tooth surface), thereby guiding and limiting the sliding of the second rack 382. The guide block 37 can also be integrally formed with the support frame 12, or other methods can be used to ensure the sliding direction of the second rack 382. The support frame 12 is also provided with a speed ratio component 35. The initial gear of the speed ratio component 35 meshes with the second rack 382, ​​and its terminal gear meshes with the swing rod 36. One end of the swing rod 36 is rotatably connected to the support frame 12, and the other end has a groove. The second swing roller 5 rotates and slides in the groove. The speed ratio component 35 is a reduction gear set, so that the rotational speed of the second swing roller 5 is less than that of the first swing roller 4, achieving a more precise spreading action.

[0025] The support frame 12 is also provided with a third rack 383, which is arc-shaped with the same curvature as the rolling surface and is located on the side of the first rack 381 away from the powder box 13. The second swing roller 5 is arranged parallel to the first swing roller 4, and both ends of the second swing roller 5 are provided with second meshing teeth along the circumference, which mesh with the third rack 383. Preferably, the diameter of the first swing roller 4 is larger than the diameter of the second swing roller 5.

[0026] In use, the device is fitted onto the pressure roller. Powder enters from the powder box 13 and falls onto the pressure roller. The pressure roller then carries the powder through the first swing roller 4 and the second swing roller 5. The drive source 21 drives the rotating shaft 22 to rotate, causing the connecting frame 33, the slide plate 32, the second rack 382, ​​and the sliding seat 34 to slide back and forth.

[0027] As the sliding seat 34 slides along the connecting frame 33 and the sliding plate 32, it drives the first swing roller 4 to move along the arc of the first rack 381. The sliding seat 34 can move up and down relative to the connecting frame 33 via the second slide rail 312. At the same time, since the first rack 381 meshes with the first meshing tooth, the first swing roller 4 will also rotate around its axis during the movement, thereby realizing the first coating of powder.

[0028] Simultaneously, the second rack 382 moves, driving the speed ratio assembly 35 to rotate. The speed ratio assembly 35 transmits power to the swing arm 36, causing the swing arm 36 to rotate, thereby driving the second swing roller 5 to move along the third rack 383, while simultaneously rotating itself. During this process, the second swing roller 5 can slide in the groove, thus achieving height adjustment. Because the speed ratio assembly 35 can decelerate, the rotational speed of the second swing roller 5 is lower than that of the first swing roller 4, thereby achieving a second and more refined spreading of the powder.

[0029] The powder spreading device described in this utility model has a compact structure and can coat the powder twice through a double swing roller structure. It can improve the spreading quality while ensuring processing efficiency, thereby obtaining a more uniform electrode film and achieving a more consistent dry powder coating effect.

[0030] In the description of this application, it should be understood that if terms such as "upper", "lower", "front", "rear", "left", "right", "X direction", "Y direction" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] Furthermore, where the terms "first," "second," and "third" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," and "third" may explicitly or implicitly include at least one of those features. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A powder spreading device, characterized in that, include: The device includes a support frame, a drive source, a transmission assembly, a first swing roller, and a second swing roller. The bottom of the support frame is attached to the pressure roller to form a rolling surface. A powder drop box corresponding to the rolling surface is provided on the support frame. The drive source is located on the support frame and drives the first swing roller and the second swing roller to roll along the rolling surface through the transmission assembly. The second swing roller is located on the side of the first swing roller away from the powder drop box.

2. The powder spreading device according to claim 1, characterized in that: The transmission assembly includes a slide plate, a sliding seat, a first rack, a second rack, a speed ratio component, a rocker arm, and a third rack. The slide plate is mounted on the support frame and is driven by the drive source to slide along a first direction. The sliding seat is slidably connected to the slide plate and slides relative to the slide plate along a second direction. The projections of the first and second directions on the slide plate intersect. The first rocker roller is rotatably mounted on the sliding seat and meshes with the first rack mounted on the support frame. The second rack is mounted on the slide plate. The input end of the speed ratio component meshes with the second rack, and the output end meshes with the rocker arm. The rocker arm is rotatably mounted on the support frame and has a groove. The second rocker roller is slidably mounted in the groove and meshes with the third rack mounted on the support frame.

3. The powder spreading device according to claim 2, characterized in that: The first direction and the second direction are perpendicular.

4. A powder spreading device according to claim 2 or 3, characterized in that: The bottom of the support frame, the tooth surfaces of the first rack and the third rack are all arc-shaped with the same curvature.

5. The powder spreading device according to claim 4, characterized in that: The speed ratio component is a reduction gear set.

6. The powder spreading device according to claim 2, characterized in that: It also includes a guide block disposed on the support frame, the guide block abutting against the side of the second rack away from the tooth surface.

7. The powder spreading device according to claim 4, characterized in that: It also includes a rotating shaft, an eccentric wheel, and a bearing. The output end of the drive source drives the rotating shaft to rotate via a synchronous belt. The rotating shaft is rotatably mounted on the support frame. The eccentric wheel is eccentrically mounted on the rotating shaft. A bearing is sleeved on the outer side of the eccentric wheel. The slide plate is provided with a sliding groove. The bearing is slidably mounted in the sliding groove along the second direction.

8. A powder spreading device according to claim 5, characterized in that: The transmission assembly further includes a connecting frame, which is connected to the support frame via a first slide rail extending along the first direction. The connecting frame is also connected to the sliding seat via a second slide rail extending along the second direction. The sliding plate is disposed on the connecting frame.

9. A powder spreading device according to claim 1, characterized in that: The transmission components are arranged in two sets and symmetrically on both sides of the support frame, with the drive source, the first swing roller, and the second swing roller located between the two sets of transmission components.

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