A ball mill for grinding alumina powder

Abstract

The invention discloses a ball mill for grinding alumina micropowder, which relates to the technical field of ball mills. The ball mill comprises a base, a side box body is fixedly arranged on one side of the base, an outer cylinder body is rotatably arranged on the base through a mounting frame, an inner cylinder body is fixedly arranged in the outer cylinder body, an outer spiral plate is fixedly arranged between the outer cylinder body and the inner cylinder body, and an inner spiral plate is fixedly arranged in the inner cylinder body. One end of the outer cylinder body extends into the side box body and is provided with an expansion part, a plurality of grinding ball holding assemblies are arranged in an annular array inside the expansion part, a mixing trough is fixedly arranged on a side wall of the side box body and located in the expansion part, a discharge end of the mixing trough extends into the inner cylinder body, a feed pipe connected with the mixing trough is fixedly arranged on the side box body, and a filter screen is arranged on the circumferential wall of the expansion part. The invention can realize the recycling of grinding balls, and can realize uninterrupted feeding and discharging by continuously replenishing alumina powder raw materials into the mixing trough, thereby improving the grinding efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of ball mills, in particular to a ball mill used for grinding aluminum oxide micropowder. Background Art

[0002] Alumina powder is an industrial material with adsorption performance, catalytic activity, high porosity, high dispersion and large specific surface area. It is generally made of industrial aluminum hydroxide or industrial aluminum oxide, and calcined at an appropriate temperature to form a crystal-stable α-type aluminum oxide product; it is made of calcined α-type aluminum oxide as a raw material, and further refined by ball milling;

[0003] For example, the utility model with the announcement number CN217164670U discloses a ball mill for aluminum oxide production that is easy to clean, comprising: a mounting base, an outer cylinder, a mounting frame, a rotating shaft, a large sprocket, a transmission chain, a transmission shaft, a small sprocket, a ball milling cylinder, a sealing plug, and a plurality of discharge holes, wherein two support frames are symmetrically fixedly connected to the top of the mounting base, and the outer cylinder is fixedly connected to the top of the support frame;

[0004] However, the existing ball mill needs to be stopped after grinding to discharge the alumina powder, which greatly reduces the work efficiency. Therefore, providing a ball mill that can continuously feed and discharge is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a ball mill for grinding alumina powder, which solves the technical problem that the prior art device cannot feed and discharge materials while the ball mill is running.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a ball mill for grinding alumina powder, comprising a base, a side box body fixedly arranged on one side of the base, an outer cylinder body rotatably arranged on the base through a mounting frame, an inner cylinder body fixedly arranged in the outer cylinder body, an outer spiral plate fixedly arranged between the outer cylinder body and the inner cylinder body, an inner spiral plate fixedly arranged in the inner cylinder body, the inner spiral plate and the outer spiral plate have opposite rotation directions, one end of the inner cylinder body is an open end, the material in the inner cylinder body can enter the outer cylinder body through the open end, a grinding channel that promotes the axial movement of grinding balls and alumina powder can be formed by the outer spiral plate and the inner spiral plate, one end of the outer cylinder body extends into the side box body and is provided with an expansion portion, the expansion portion There are multiple grinding ball holding assemblies in an annular array inside the expansion part, a mixing trough is fixedly arranged on one side wall of the side box body and located in the expansion part, and the discharge end of the mixing trough extends into the inner cylinder body, and when the outer cylinder body rotates, the grinding balls in the alumina powder can be scooped out and put into the mixing trough through the grinding ball holding assembly, and enter the inner cylinder body again through the mixing trough, a feeding pipe connected to the mixing trough is fixedly arranged on the side box body, a filter screen is arranged on the circumferential wall of the expansion part, a discharge port is arranged at the bottom of the side box body, a motor is fixedly arranged on the base, a reducer is connected to the power output end of the motor, a gear is connected to the power output end of the reducer, and a gear ring that can mesh with the gear is fixedly arranged on the outer surface of the outer cylinder body.

[0007] Preferably, the grinding ball holding assembly includes a plurality of vertical plates fixedly installed in the expansion portion, the plurality of vertical plates are arranged in an array along the axial direction of the expansion portion, the spacing between each of the vertical plates is no greater than the diameter of the grinding ball, a baffle is fixedly provided on one side of the plurality of vertical plates close to the circumferential wall of the expansion portion, the height of the baffle is lower than the radius of the grinding ball, a grinding ball holding area is formed by the plurality of vertical plates, the baffle and the circumferential inner wall of the expansion portion, and the grinding ball holding area can hold a fixed number of grinding balls.

[0008] Preferably, a plurality of inclined buffer plates are fixedly provided on the inner wall surface of the side box body, and the falling speed of the grinding balls that are not put into the mixing tank can be reduced by the buffer plates.

[0009] Preferably, the inner annular array of the outer cylinder has a plurality of levers.

[0010] Preferably, an end cover is fixedly provided at one end of the outer cylinder, and an anti-smash layer is provided on the inner surface of the end cover.

[0011] Preferably, a bell mouth is fixedly provided at one end of the inner cylinder.

[0012] The present invention provides a ball mill for grinding alumina micropowder, which has the following beneficial effects: an inner cylinder is arranged in an outer cylinder to form an inner and outer grinding zone, thereby increasing the grinding channel under the premise of a fixed length cylinder, reducing the floor space of the equipment while increasing the grinding time, and further increasing the total length of the cylinder to increase the grinding time; an inner spiral plate and an outer spiral plate are provided to enable the grinding balls and alumina powder in the cylinder to move axially; when the grinding balls and alumina powder move to the expansion portion, the alumina powder therein will pass through a filter screen and be discharged into a side box body, and finally be discharged through a discharge port, while the grinding balls can be fished out again by a grinding ball holding assembly and put into a mixing tank; the grinding balls can be recycled in the above manner, and uninterrupted feeding and discharging can be achieved by continuously replenishing alumina powder raw materials into the mixing tank, thereby improving the grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the main view of the internal structure of the present invention;

[0014] Figure 2 for Figure 1 Sectional view of AA in the middle;

[0015] Figure 3 is a three-dimensional diagram of the expansion portion of the present invention;

[0016] Figure 4 for Figure 1 Cross-sectional view of BB.

[0017] In the figure: 1. base; 2. side box; 3. mounting frame; 4. outer cylinder; 5. inner cylinder; 6. outer spiral plate; 7. inner spiral plate; 8. mixing trough; 9. feed pipe; 10. expansion part; 11. discharge port; 12. gear ring; 13. motor; 14. reducer; 15. gear; 16. vertical plate; 17. baffle bar; 18. lever; 19. anti-smash layer; 20. filter screen; 21. buffer plate; 22. bell mouth; 23. end cover. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] See also Figure 1-4The present invention provides a technical solution: a ball mill for grinding alumina powder, comprising a base 1, a side box 2 is fixedly arranged on one side of the base 1, an outer cylinder 4 is rotatably arranged on the base 1 through a mounting frame 3, an inner cylinder 5 is fixedly arranged inside the outer cylinder 4, an outer spiral plate 6 is fixedly arranged between the outer cylinder 4 and the inner cylinder 5, an inner spiral plate 7 is fixedly arranged inside the inner cylinder 5, and the inner spiral plate 7 and the outer spiral plate 6 rotate in opposite directions, one end of the inner cylinder 5 is an open end, and the material in the inner cylinder 5 can enter the outer cylinder 4 through the open end, and the material in the inner cylinder 5 can enter the outer cylinder 4 through the open end. The outer spiral plate 6 and the inner spiral plate 7 can form a grinding channel that drives the grinding balls and alumina powder to move axially. The inner and outer grinding areas are formed by the inner cylinder 5 and the outer cylinder 4. The grinding channel is increased under the premise of a fixed length of the cylinder, which reduces the floor space of the equipment and increases the grinding time. The grinding time can be further increased by increasing the total length of the cylinder. One end of the outer cylinder 4 extends into the side box 2 and is provided with an expansion portion 10. A plurality of grinding ball holding assemblies are arranged in an annular array inside the expansion portion 10. On one side wall of the side box 2 and A mixing tank 8 is fixedly arranged in the expansion part 10, and the discharge end of the mixing tank 8 extends into the inner cylinder 5. When the outer cylinder 4 rotates, the grinding balls in the alumina powder can be scooped out and put into the mixing tank 8 through the grinding ball holding assembly, and then enter the inner cylinder 5 again through the mixing tank 8. A feeding pipe 9 connected to the mixing tank 8 is fixedly arranged on the side box 2. The alumina powder raw material can enter the mixing tank 8 through the feeding pipe 9, and then enter the inner cylinder 5 together with the grinding balls. A filter screen 20 is arranged on the circumferential wall of the expansion part 10. The side box 2 A discharge port 11 is provided at the bottom. The alumina powder and grinding balls in the outer cylinder 4 can enter the expansion part 10 under the push of the outer spiral plate 6. Then the alumina powder can pass through the filter screen 20 into the side box 2 and be discharged through the discharge port 11. A motor 13 is fixedly provided on the base 1. The power output end of the motor 13 is connected to a reducer 14. The power output end of the reducer 14 is connected to a gear 15. A gear ring 12 that can mesh with the gear 15 is fixedly provided on the outer surface of the outer cylinder 4. Starting the motor 13 can rotate the cylinder.

[0020] As an embodiment of the present invention, the grinding ball holding assembly includes a plurality of vertical plates 16 fixedly installed in the expansion portion 10, the plurality of vertical plates 16 are arranged in an array along the axial direction of the expansion portion 10, the spacing between each vertical plate 16 is not greater than the diameter of the grinding ball, the aluminum oxide powder can be left out through the gap between each vertical plate 16, so that the grinding balls in the aluminum oxide powder can be fished out, and a baffle 17 is fixedly provided on one side of the plurality of vertical plates 16 close to the circumferential wall of the expansion portion 10, the height of the baffle 17 is lower than the radius of the grinding ball, and a grinding ball holding area is formed by the plurality of vertical plates 16, the baffle 17 and the circumferential inner wall of the expansion portion 10, the grinding ball holding area can hold a fixed number of grinding balls, and as the cylinder rotates When the vertical plate 16 moves to the bottom of the cylinder, multiple grinding balls can be fished out from the bottom of the expansion part 10. Since the balls are easy to roll, the grinding ball holding area can be filled. As the cylinder rotates, when the vertical plate 16 is higher than the axis of the cylinder, its upper surface can be tilted toward the center of the cylinder. At this time, the grinding balls located on the outside of the baffle 17 can roll outward to discharge excess grinding balls, while the grinding balls in the grinding ball holding area are blocked by the baffle 17 and remain on multiple vertical plates 16. Since the height of the baffle 17 is lower than the radius of the grinding balls, as the vertical plate 16 continues to move upward, the baffle 17 cannot block the grinding balls. At this time, the grinding balls can be discharged into the mixing tank 8 to achieve the recycling of the grinding balls.

[0021] As an embodiment of the present invention, a plurality of inclined buffer plates 21 are fixedly provided on the inner wall surface of the side box body 2. The buffer plates 21 can reduce the descending speed of the grinding balls that are not put into the mixing tank 8, thereby preventing the grinding balls descending from a high place from damaging the vertical plates 16.

[0022] As an embodiment of the present invention, the inner annular array of the outer cylinder 4 has multiple levers 18. Since the diameter of the outer cylinder 4 is larger than that of the inner cylinder 5, the material in the outer cylinder is more likely to slip. The levers 18 can be used to move the material in the outer cylinder 4 to improve the stirring effect.

[0023] As an embodiment of the present invention, an end cover 23 is fixedly provided at one end of the outer cylinder 4, and an anti-smash layer 19 is provided on the inner surface of the end cover 23. The anti-smash layer 19 can buffer the material discharged from the inner cylinder 5 to reduce the descending height of the grinding balls and protect the grinding balls. The anti-smash layer 19 can be replaced by removing the end cover 23.

[0024] As an embodiment of the present invention, a bell mouth 22 is fixedly provided at one end of the inner cylinder 5, and the bell mouth 22 can further reduce the height of the grinding balls.

[0025] The working principle and use process of the present invention are as follows: when in use, the motor 13 is connected to the power supply and the control switch through the wire, and the motor 13 is started to rotate the outer cylinder 4 and the inner cylinder 5 therein, and the alumina powder raw material is fed into the mixing tank 8 through the feed pipe 9 at a fixed flow rate, and the grinding balls stored in the expansion part 10 can be fed into the mixing tank 8 through the grinding ball holding assembly, and the number of grinding balls fed each time can be limited by the grinding ball holding area, and the ratio of the two can be controlled by controlling the flow rate of the alumina powder raw material fed, and the grinding balls and the alumina powder are merged in the mixing tank 8 and enter the inner cylinder 5 at the same time, and the grinding balls and the alumina powder are moved by the rotation of the inner cylinder 5 to achieve grinding, and the inner screw Under the action of the spiral plate 7, the grinding balls and alumina powder can be moved to one end of the inner cylinder 5 at the same time, and then flow into the outer cylinder 4 through the open end of the inner cylinder 5 and be ground again. The grinding balls and alumina powder can be moved toward the expansion part 10 through the outer spiral plate 6. When the grinding balls and alumina powder move to the expansion part 10, the alumina powder therein will pass through the filter screen 20 and be discharged into the side box 2, and finally be discharged through the discharge port 11, and the grinding balls can be fished out again by the grinding ball holding assembly and put into the mixing tank 8. The above method can realize the recycling of the grinding balls, and by continuously replenishing the alumina powder raw material into the mixing tank 8, uninterrupted feeding and discharging can be achieved, thereby improving the grinding efficiency.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ball mill for grinding alumina powder, characterized in that: The invention comprises a base (1), a side box (2) is fixedly arranged on one side of the base (1), an outer cylinder (4) is rotatably arranged on the base (1) via a mounting frame (3), an inner cylinder (5) is fixedly arranged inside the outer cylinder (4), an outer spiral plate (6) is fixedly arranged between the outer cylinder (4) and the inner cylinder (5), an inner spiral plate (7) is fixedly arranged inside the inner cylinder (5), the inner spiral plate (7) and the outer spiral plate (6) have opposite rotation directions, and the outer spiral plate (6) and the inner spiral plate (7) are fixedly arranged inside the inner cylinder (5). One end of the inner cylinder (5) is an open end, and the material in the inner cylinder (5) can enter the outer cylinder (4) through the open end. The outer spiral plate (6) and the inner spiral plate (7) can form a grinding channel that drives the grinding balls and the aluminum oxide powder to move axially. One end of the outer cylinder (4) extends into the side box (2) and is provided with an expansion portion (10). A plurality of grinding ball holding assemblies are arranged in an annular array inside the expansion portion (10). The side box (2 ) is fixedly provided on one side wall of the expansion part (10), and is located in the expansion part (10). The discharge end of the mixing trough (8) extends into the inner cylinder (5). When the outer cylinder (4) rotates, the grinding balls in the aluminum oxide powder can be scooped out through the grinding ball holding assembly and put into the mixing trough (8), and then enter the inner cylinder (5) again through the mixing trough (8). A feeding pipe (9) connected to the mixing trough (8) is fixedly provided on the side box (2). A filter screen (20) is provided on the circumferential wall of the expansion part (10). A discharge port (11) is provided at the bottom of the side box (2). A motor (13) is fixedly provided on the base (1). The power output end of the motor (13) is connected to a reducer (14). The power output end of the reducer (14) is connected to a gear (15). A gear ring (12) capable of meshing with the gear (15) is fixedly provided on the outer surface of the outer cylinder (4).

2. A ball mill for grinding alumina powder according to claim 1, characterized in that: The grinding ball holding assembly comprises a plurality of vertical plates (16) fixedly installed in the expansion portion (10), the plurality of vertical plates (16) being arranged in an array along the axial direction of the expansion portion (10), the spacing between each of the vertical plates (16) being no greater than the diameter of the grinding ball, a baffle (17) being fixedly arranged on one side of the plurality of vertical plates (16) close to the circumferential wall surface of the expansion portion (10), the height of the baffle (17) being lower than the radius of the grinding ball, a grinding ball holding area being formed by the plurality of vertical plates (16), the baffle (17) and the circumferential inner wall surface of the expansion portion (10), and the grinding ball holding area being capable of holding a fixed number of grinding balls.

3. A ball mill for grinding alumina powder according to claim 2, characterized in that: A plurality of inclined buffer plates (21) are fixedly arranged on the inner wall surface of the side box body (2), and the buffer plates (21) can reduce the descending speed of the grinding balls that are not put into the mixing tank (8).

4. A ball mill for grinding alumina powder according to claim 1, characterized in that: The outer cylinder (4) has a plurality of levers (18) in a circular array inside.

5. A ball mill for grinding alumina powder according to claim 1, characterized in that: An end cover (23) is fixedly provided at one end of the outer cylinder (4), and an anti-smash layer (19) is provided on the inner surface of the end cover (23).

6. A ball mill for grinding alumina powder according to claim 5, characterized in that: A bell mouth (22) is fixedly provided at one end of the inner cylinder (5).

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