Coating tank capable of ensuring uniform dispersion of coating slurry

Abstract

The utility model relates to a coating tank for ensuring uniform dispersion of coating slurry, which comprises a tank body, an upper cover, a stirring mechanism and a pneumatic motor, the stirring mechanism comprises a main shaft, a stirring support and a stirring paddle, the upper end of the main shaft is connected with an output shaft flange of the pneumatic motor, and the lower end of the main shaft is needle-shaped and is supported in a groove at the bottom of the tank body. The stirring support comprises a U-shaped integral structure formed by a left vertical support, a right vertical support and a bottom support, two symmetrical stirring paddles which are not in the same plane are fixedly connected to the stirring support, the stirring paddles are semicircular, the upper end of one stirring paddle is fixedly connected with the upper end of the left vertical support, and the lower end of the stirring paddle is fixedly connected with the bottom end of the right vertical support. The upper end of the other stirring paddle is fixedly connected with the upper end of the right vertical bracket, and the lower end of the stirring paddle is fixedly connected with the bottom end of the left vertical bracket to form an arc-shaped stirring mechanism. The device has the beneficial effects that by adopting the arc-shaped stirring mechanism, slurry in the coating tank can be uniformly dispersed, slurry sedimentation is reduced, and controllable slurry is provided for the interior of the spray head.

Description

Technical Field

[0001] This utility model belongs to the field of coating machine technology, and in particular relates to a coating tank that ensures uniform dispersion of coating slurry. Background Technology

[0002] In the production of lithium-ion batteries, the coating process is the bottleneck in the entire lithium battery manufacturing process, and quality control of the coating process is particularly important.

[0003] With the improvement of coating machine performance, the technical requirements for electrode coating have greatly increased, aiming to effectively control the quality of coated electrodes. To ensure stable material supply and coating by the coating machine, the slurry in the coating tank must maintain a certain liquid level. Existing coating tanks use a stirring mechanism with several short anchor-shaped agitators at the top and bottom. This type of agitator relies on centrifugal force to rotate the slurry, which can create dead zones in the stirring. Due to the different concentrations of various slurries, some slurry in the tank will settle over time, leading to nozzle blockage, high drying pressure, and poor coating coverage. Patent document CN107732141B discloses a battery slurry coating device, including a mixing cylinder, a transfer tank, a slurry tank, a coating head, and several slurry pipes. The mixing cylinder is used to mix the slurry. The transfer tank includes a stirrer, a first inlet, a first outlet, and a return outlet. The slurry tank includes a tank shell, an arc-shaped bottom plate, and several ultrasonic transducers. The tank shell includes a bottom wall and a side wall extending from the edge of the bottom wall on the same side. The arc-shaped bottom plate is spaced apart from the bottom wall, and several ultrasonic transducers are fixed on the bottom wall and emit ultrasonic waves into the slurry tank. The slurry tank also has a second inlet and a pair of second outlets. The second inlet penetrates the bottom wall and the arc-shaped bottom plate. The pair of second outlets are located on the side wall. The coating head is mounted on the side wall of the slurry tank. Several slurry pipes are respectively connected to the first inlet of the mixing cylinder and the transfer tank, the first outlet of the transfer tank and the second inlet of the slurry tank, and the second outlet of the slurry tank and the return outlet of the transfer tank. This invention can prevent slurry sedimentation and improve slurry uniformity.

[0004] There is an urgent need to introduce a new type of mixing tank in production, which can ensure that the slurry moves at a uniform speed in all parts of the coating tank, so that the slurry remains consistent in the initial state of feeding and during the mixing process, and will not stick or settle, thus avoiding poor coating and equipment malfunctions. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of the prior art and provide a coating tank that ensures uniform dispersion of the coating slurry. This ensures uniform dispersion of the slurry within the coating tank, reduces slurry settling, improves the coating quality of the electrode sheet, and effectively controls the coating amount of the electrode sheet.

[0006] To achieve the above objectives, this utility model provides a coating tank that ensures uniform dispersion of the coating slurry. The tank includes a tank body with an inlet and an outlet, a top cover, a stirring mechanism, and a pneumatic motor. The stirring mechanism includes a main shaft, a stirring support, and stirring paddles. The upper end of the main shaft is connected to the output shaft flange of the pneumatic motor, and the lower end of the main shaft is needle-shaped and supported in a groove at the bottom of the tank body. The stirring support comprises a left upright support, a right upright support, and a bottom support, forming a U-shaped overall structure. Two symmetrical stirring paddles, not on the same plane, are fixed to the stirring support. The stirring paddles are semi-circular in shape. The upper end of one stirring paddle is fixed to the upper end of the left upright support, and the lower end of the stirring paddle is fixed to the bottom end of the right upright support. The upper end of the other stirring paddle is fixed to the upper end of the right upright support, and the lower end of the stirring paddle is fixed to the bottom end of the left upright support, forming an arc-shaped stirring mechanism with a clearance fit to the inner wall of the tank.

[0007] Preferably, the top cover is provided with a handle, and the top cover is sealed to the top of the tank.

[0008] Preferably, the upper cover is provided with a viewing window for observing the liquid level.

[0009] Preferably, the pneumatic motor is fixed to the upper cover.

[0010] Preferably, the upper cover is fixedly connected to a contact level gauge that extends into the inner cavity of the tank.

[0011] Preferably, the bottom support of the stirring bracket has an obtuse angle, and its shape matches the conical bottom of the tank.

[0012] Preferably, the inner wall of the tank is provided with a Teflon coating.

[0013] Preferably, the tank body has an inlet and an outlet on both sides that communicate with its inner cavity.

[0014] Preferably, a crossbar for limiting the liquid level is fixed to the upper part of the main shaft.

[0015] Preferably, there is a 50mm space between each side of the crossbar and the inner wall of the tank.

[0016] Beneficial effects: Compared with existing technologies, the use of an arc-shaped stirring mechanism ensures uniform dispersion of the slurry in the coating tank, reduces slurry settling, and provides controllable slurry to the nozzle. It effectively reduces coating aberrations on the electrode sheets, improving electrode performance and quality. The simple and reasonable layout effectively improves slurry stability, reduces electrode quality anomalies, and increases the electrode quality pass rate and production achievement rate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2yes Figure 1 An exterior schematic diagram;

[0019] Figure 3 yes Figure 1 Schematic diagram of the stirring mechanism;

[0020] Figure 4 yes Figure 3 A schematic diagram of the rotating state of the stirring paddle.

[0021] In the diagram: 1. Tank body, 2. Top cover, 2-1. Handle, 3. Stirring mechanism, 3-1. Main shaft, 3-2. Stirring paddle, 3-3. Left vertical support, 3-4. Right vertical support, 3-5. Bottom support, 4. Pneumatic motor, 5. Inlet, 6. Outlet, 7. Viewing window, 8. Contact level gauge, 9. Crossbar. Detailed Implementation

[0022] The following detailed description of the specific implementation of the present invention, in conjunction with preferred embodiments, is as follows: Referring to the accompanying drawings, this embodiment provides a coating tank that ensures uniform dispersion of the coating slurry. The tank includes a tank body 1 with an inlet 5 and an outlet 6, a top cover 2, a stirring mechanism 3, and a pneumatic motor 4. The stirring mechanism includes a main shaft 3-1, a stirring support, and stirring paddles 3-2. The upper end of the main shaft is connected to the output shaft flange of the pneumatic motor, and the lower end of the main shaft is needle-shaped and supported in a groove at the bottom of the tank body. The stirring support includes a left upright support 3-3, a right upright support 3-4, and a bottom support 3-5, forming a U-shaped overall structure. Two symmetrical stirring paddles, not on the same plane, are fixed to the stirring support. The stirring paddles are semi-circular in shape. The upper end of one stirring paddle is fixed to the upper end of the left upright support, and the lower end of the stirring paddle is fixed to the bottom end of the right upright support. The upper end of the other stirring paddle is fixed to the upper end of the right upright support, and the lower end of the stirring paddle is fixed to the bottom end of the left upright support, forming an arc-shaped stirring mechanism with a clearance fit to the inner wall of the tank.

[0023] In a preferred embodiment, the upper cover is provided with a handle 2-1, and the upper cover is sealed to the top of the tank.

[0024] In a preferred embodiment, the upper cover is provided with a viewing window 7 for observing the liquid level.

[0025] In a preferred embodiment, the pneumatic motor is fixedly attached to the upper cover.

[0026] In a preferred embodiment, the upper cover is fixedly connected to a contact level gauge 8 that extends into the inner cavity of the tank.

[0027] In a preferred embodiment, the bottom support of the stirring bracket is obtuse-angled, and its shape matches the conical bottom of the tank.

[0028] In a preferred embodiment, the inner wall of the tank is coated with Teflon to prevent the stirring device from rubbing against the tank wall during loading and unloading, thus preventing the generation of metallic foreign objects.

[0029] In a preferred embodiment, the tank body is provided with an inlet and an outlet on both sides that communicate with its inner cavity.

[0030] In a preferred embodiment, a crossbar 9 for limiting the liquid level is fixedly connected to the upper part of the main shaft.

[0031] In this preferred embodiment, there is a 50mm space between each side of the crossbar and the inner wall of the tank to ensure that the contact level gauge does not collide with it.

[0032] Working principle and process

[0033] By using the liquid level limiting bar at the top of the stirring rod, the needle-shaped lower end of the main shaft (commonly known as a spear structure), and the semi-circular stirring paddles welded to both ends to form a single unit, it is possible to ensure that the slurry in all positions from the bottom to the top of the tank is fully stirred and dispersed, ensuring the uniformity of the slurry in the tank, reducing non-dispersion and sedimentation, thereby ensuring effective control of the electrode coating amount.

[0034] Once the cylinder is activated, this device maintains a uniform clockwise rotation, ensuring that the stirred slurry covers every part of the slurry within the coating tank. This prevents sedimentation and thickening of the slurry. This structure effectively improves the quality of the coated electrode, ensures controllable coating amount, and reduces defects.

[0035] The working principle of this utility model is as follows: the crossbar at the top of the stirring rod, the spear-shaped part at the bottom, and the semi-circular arc welded to both ends are connected together to ensure that the slurry in all positions from the bottom to the top of the tank can be fully stirred and dispersed, ensuring the uniformity of the slurry in the tank, reducing non-dispersion and sedimentation, thereby ensuring effective control of the electrode coating amount.

[0036] Working process: The liquid level is basically located on the upper surface of the crossbar, ensuring that the slurry in the coating tank can be fully covered and stirred at a uniform speed during normal coating.

[0037] The contact level gauge controls the slurry level in the coating tank, and the sight glass allows observation of the actual slurry level. Air is supplied to the pneumatic motor via the air source interface at a pressure of 0.2 MPa, causing it to rotate at approximately 25 rpm / min. During rotation, the slurry in the coating tank is evenly dispersed, slowing its settling rate and ensuring slurry stability. This device effectively reduces the slurry settling velocity, ensuring slurry stability within the tank and guaranteeing high-quality slurry supplied to the die head, thus improving the control of electrode coating amount.

[0038] The above detailed description of a coating tank that ensures uniform dispersion of coating slurry, with reference to the embodiments, is illustrative rather than limiting. Several embodiments may be listed within the defined scope. Therefore, variations and modifications that do not depart from the overall concept of this utility model should be within the protection scope of this utility model.

Claims

1. A coating tank that ensures uniform dispersion of the coating slurry, characterized in that: The device includes a tank with an inlet and an outlet, a top cover, a stirring mechanism, and a pneumatic motor. The stirring mechanism includes a main shaft, a stirring bracket, and stirring paddles. The upper end of the main shaft is connected to the output shaft flange of the pneumatic motor, and the lower end of the main shaft is needle-shaped and supported in a groove at the bottom of the tank. The stirring bracket includes a left upright bracket, a right upright bracket, and a bottom bracket, forming a U-shaped integral structure. Two symmetrical stirring paddles that are not on the same plane are fixed to the stirring bracket. The stirring paddles are semi-circular in shape. The upper end of one stirring paddle is fixed to the upper end of the left upright bracket, and the lower end of the stirring paddle is fixed to the bottom end of the right upright bracket. The upper end of the other stirring paddle is fixed to the upper end of the right upright bracket, and the lower end of the stirring paddle is fixed to the bottom end of the left upright bracket, forming an arc-shaped stirring mechanism with a clearance fit with the inner wall of the tank.

2. The coating tank for ensuring uniform dispersion of the coating slurry according to claim 1, characterized in that: The top cover is equipped with a handle, and the top cover is sealed to the top of the tank.

3. The coating tank for ensuring uniform dispersion of the coating slurry according to claim 1 or 2, characterized in that: The top cover is provided with a viewing window for observing the liquid level.

4. The coating tank for ensuring uniform dispersion of the coating slurry according to claim 1, characterized in that: The pneumatic motor is fixed to the upper cover.

5. The coating tank for ensuring uniform dispersion of the coating slurry according to claim 3, characterized in that: The top cover is fixedly connected to a contact level gauge that extends into the inner cavity of the tank.

6. The coating tank for ensuring uniform dispersion of the coating slurry according to claim 3, characterized in that: The bottom support of the stirring bracket is obtuse-angled, and its shape matches the conical bottom of the tank.

7. The coating tank for ensuring uniform dispersion of the coating slurry according to claim 1, characterized in that: The inner wall of the tank is coated with Teflon.

8. The coating tank for ensuring uniform dispersion of the coating slurry according to claim 1, characterized in that: The tank has an inlet and an outlet on both sides that communicate with its inner cavity.

9. The coating tank for ensuring uniform dispersion of the coating slurry according to claim 1, characterized in that: A horizontal bar for limiting the liquid level is fixed to the upper part of the main shaft.

10. The coating tank for ensuring uniform dispersion of the coating slurry according to claim 9, characterized in that: There is a 50mm space between each side of the crossbar and the inner wall of the tank.

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