Stirring tank of sand mill

Abstract

The utility model discloses a sand mill stirring tank, which comprises a tank body and a stirring device, the upper part of the tank body is provided with a feeding hole, the stirring device is positioned in the tank body, a guide pipeline is fixed at the feeding hole, and the part of the guide pipeline in the tank body is bent. According to the utility model, the guide pipeline which is partially bent is used for buffering slurry, so that the slurry is prevented from splashing, the stirring and grinding effects on the slurry can be improved, and the homogeneity of the slurry is ensured.

Description

Technical Field

[0001] The utility model relates to a stirring tank, in particular to a sand mill stirring tank. Background Art

[0002] In the preparation process of lithium battery positive electrode materials, a sand mill is usually used to grind the positive electrode material slurry.

[0003] In the existing sand mill mixing tank, when the slurry flows back from the sand mill to the mixing tank through the reflux port, the reflux port is perpendicular to the liquid level in the tank, and the reflux slurry directly impacts the liquid level in the tank, causing the slurry to splash over a large area and then adhere to the wall and top of the mixing tank, resulting in material loss and imbalance in the material element ratio, as well as uneven material mixing and grinding, which has a great impact on the reliability of the test results. Utility Model Content

[0004] Purpose of the utility model: The purpose of the utility model is to provide a sand mill stirring tank that can improve the grinding homogeneity of lithium battery positive electrode material slurry.

[0005] Technical solution: The sand mill mixing tank described in the utility model includes a tank body with a feed port opened on the top and a stirring device located inside the tank body. The feed port is fixed with a guide pipe, and the guide pipe is partially bent inside the tank body.

[0006] By setting a bending section in the guide pipe to guide the slurry into the tank, the impact force when the slurry enters the tank can be effectively alleviated, the splashing of the slurry can be reduced, and the homogeneity of the material can be improved.

[0007] The stirring device includes a stirring spindle and a stirring paddle fixedly mounted on the stirring spindle. The outlet of the guide pipe is located completely below the highest point of the stirring paddle. Lowering the outlet of the guide pipe to within the height range of the stirring paddle ensures that even slight splashes of slurry are promptly scraped off by the stirring paddle and resumed in the grinding and stirring process.

[0008] The stirring paddle is provided with an avoidance notch corresponding to the position of the guide pipe. The avoidance notch can prevent the stirring paddle from interfering with the stirring paddle during its rotation, thereby ensuring the working reliability of the stirring device.

[0009] The guide pipe includes a vertical section and an inclined section connected in sequence. The vertical section is fixedly connected to the feed port. The angle between the inclined section and the vertical section is α, with a range of 120°≤α≤150°. If the guide pipe's bend angle is too small, the slurry flow rate will be affected, especially when the material has a high solids content, where blockage may occur. If the bend angle is too large, the slurry will still generate a significant impact force, and the guide pipe's buffering effect on the slurry will be less effective.

[0010] The stirring device includes a scraper that fits against the inner wall of the tank. The scraper is made of a soft material, such as silicone or rubber. The scraper scrapes the slurry from the inner wall of the tank, achieving overall stirring of the slurry. This prevents the formation of an adherent layer of slurry near the side wall due to insufficient stirring, thereby improving the homogeneity of the slurry.

[0011] The bottom of the tank is conical, and the scraper is continuously arranged and extends downward to the bottom of the tank, with the lower section of the scraper fitting closely to the bottom of the tank. The conical bottom facilitates the flow and circulation of materials, and the scraper continuously ensures full contact with the tank, ensuring that the slurry at all heights is fully ground and stirred.

[0012] The stirring paddle of the stirring device is provided with a material flow hole, which increases the fluidity of the slurry, improves the stirring rate, and reduces the energy consumption of the sand mill.

[0013] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. A guide pipe is set at the feed port, and the guide pipe is bent to provide a buffer for the slurry, prevent the slurry from splashing and sticking, and improve the homogeneity of the slurry; 2. The stirring paddle with a continuous scraper can completely scrape and fully stir the slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present utility model. DETAILED DESCRIPTION

[0015] The technical solution of the present utility model will be further described below with reference to the accompanying drawings.

[0016] Example 1: Figure 1 As shown, the sand mill mixing tank described in the present invention includes a tank body 1 and a stirring device. A feed port is provided above the tank body 1. A guide pipe 2 is fixed to the feed port. The portion of the guide pipe 2 located inside the tank body 1 is bent so that the guide pipe 2 forms a vertical section and an inclined section. The angle α between the inclined section and the vertical section is 120°. The solid content of the slurry entering the tank body 1 is 15%. The 120° angle between the inclined section and the vertical section of the guide pipe 2 can provide a good buffer for slurries with low solid content and reduce splashing of the slurry.

[0017] The stirring device includes a stirring main shaft 3 and two stirring paddles 4 fixedly mounted on the stirring main shaft 3. A continuous scraper 6 is provided on the side of the stirring paddle 4. The scraper 6 is in contact with the inner wall of the tank body 1. The scraper 6 is made of silicone. The scraper 6 continuously scrapes the slurry on the inner wall of the tank body 1, which can achieve full stirring of the slurry and avoid the formation of an adhesion layer on the inner wall of the slurry due to the gap between the stirring device and the tank body 1, thereby ensuring the overall homogeneity of the slurry after stirring. The bottom of the tank body 1 is conical, and the scraper 6 extends downward. The scraper 6 includes a side wall contact section that is in contact with the side wall of the tank body 1 and a bottom contact section that is in contact with the bottom of the tank body 1. The side wall contact section and the bottom contact section respectively scrape off the slurry adhering to the side wall and the bottom wall of the tank body 1. As the stirring paddle 4 rotates, the slurry in the entire tank body 1 is fully stirred. Two upper and lower material flow holes 7 are provided on the stirring paddle 4. The material flow holes 7 enable the slurry to flow when the stirring paddle 4 rotates, thereby achieving sufficient stirring of the slurry. In addition, the opening of the material flow holes 7 can reduce the rotational resistance of the stirring paddle 4 and reduce the energy consumption of the sand mill.

[0018] The outlet of the guide pipe 2 is located completely below the highest point of the stirring paddle 4. This design reduces the possibility of slurry splashing onto the top wall of the tank 1 or other areas where scraper 6 scrapes away, further ensuring the accuracy of the slurry proportioning and sufficient stirring. The stirring paddle 4 is provided with an avoidance notch 5 corresponding to the position of the guide pipe 2. When the stirring paddle 4 rotates, the avoidance notch 5 prevents the stirring paddle 4 from interfering with the guide pipe 2.

[0019] Example 2: The difference between this example and Example 1 is that the angle α between the inclined section and the vertical section is 150°, the solid content of the slurry entering the tank body 1 is 60%, and the number of stirring paddles 4 is four.

Claims

1. A sand mill mixing tank, comprising a tank body (1) with a feed port opened on the top and a stirring device located in the tank body (1), characterized in that: A guide pipe (2) is fixed to the feed port, and the guide pipe (2) is partially bent inside the tank body.

2. The sand mill mixing tank according to claim 1, characterized in that: The stirring device comprises a stirring main shaft (3) and a stirring paddle (4) fixedly mounted on the stirring main shaft, and the outlet of the guide pipe (2) is completely located below the highest point of the stirring paddle (4).

3. The sand mill mixing tank according to claim 2, characterized in that: The stirring paddle (4) is provided with an avoidance notch (5) corresponding to the position of the guide pipe (2).

4. The sand mill mixing tank according to claim 1, characterized in that: The guide pipe (2) comprises a vertical section and an inclined section connected in sequence, the vertical section is fixedly connected to the feed port, and the angle between the inclined section and the vertical section is α, 120°≤α≤150°.

5. The sand mill mixing tank according to claim 1, characterized in that: The stirring device comprises a scraper (6) arranged in contact with the inner wall of the tank body (1).

6. The sand mill mixing tank according to claim 5, characterized in that: The bottom of the tank body (1) is conical, the scraper (6) is continuously arranged and extends downward to the bottom of the tank body, and the lower section of the scraper (6) is in contact with the bottom of the tank body (1).

7. The sand mill mixing tank according to claim 1, characterized in that: A material flow through hole (7) is provided on the stirring paddle (4) of the stirring device.

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