Feeding structure of overflow type ball mill

Abstract

The utility model discloses an overflow type ball mill feeding structure which comprises a feeding pipe and a sealing device, the feeding pipe is a circular pipe body, and the discharging end of the feeding pipe is a semicircular pipe body with an upward opening; the sealing device comprises a lifting hopper installed in the hollow shaft of the feeding end, a through hole allowing the feeding pipe to pass through is formed in the lifting hopper, the inner side of the lifting hopper is open, the feeding end of the lifting hopper is connected with the end of the circular pipe of the feeding pipe, a rubber bushing is arranged at the feeding end of the lifting hopper and surrounds the feeding pipe, and the rubber bushing is connected with the feeding end of the lifting hopper. The discharging end of the lifting hopper is fixedly connected with the ball mill end cover; the lifting hopper is provided with a cavity, a plurality of partition plates are evenly distributed on the inner circumference of the cavity, the partition plates are obliquely arranged, and sealing of the feeding end structure is completed only through a mechanical structure. The sealing device fixed at the feeding end of the ball mill is used for solving the problem of ore pulp leakage of the overflow type ball mill.

Description

Technical Field

[0001] The utility model relates to the technical field of ball mills, in particular to a feeding structure of an overflow type ball mill with a slurry sealing device. Background Art

[0002] Ball mills are usually used in the production of mining, cement and various materials. They grind various ores or other grindable materials under wet or dry conditions. They are particularly widely used in the traditional mining industry. In order to achieve full monomer dissociation of the target mineral, the ore particle size must be reduced to a certain extent to provide the prerequisite for the effective separation of subsequent useful ores and gangue minerals. For large overflow ball mills, cyclones are widely used because of their small footprint and high classification efficiency.

[0003] Compared with the grid-type ball mill, the overflow ball mill has a simpler structure, a lower grinding concentration, and a high slurry level inside the cylinder. The slurry is discharged by gravity from the hollow shaft at the discharge end through the height difference. The reverse spiral structure is set at the discharge end and the feed section, mainly to prevent large pieces of ore and steel balls from overflowing. However, a small amount of slurry will also flow out from the feed end. For small ball mills, this part of the slurry is small in volume and usually a separate pipeline is set up. After being collected uniformly, it enters the pump pool through the pipeline. In actual use, it has basically no negative impact on the production process and equipment facilities. For large overflow ball mills, this part of the slurry is large in volume, and part of the slurry leaks from the feed end and penetrates into the main bearing seat, which can easily cause the lubricating oil to deteriorate, resulting in serious wear of the main bearing, affecting the sealing effect and service life of the sealing device. Utility Model Content

[0004] The utility model proposes an overflow type ball mill feeding structure, the purpose of which is to solve the problem of slurry leakage of the overflow type ball mill through a sealing device fixed at the feeding end of the ball mill.

[0005] The technical solution of this utility model is as follows:

[0006] An overflow type ball mill feeding structure, comprising a feeding pipe and a sealing device, wherein the feeding pipe is a circular tube body, and its discharge end is a semicircular tube body with an opening upward; the sealing device comprises a lifting bucket installed inside a hollow shaft of the feeding end, on which a through hole for the feeding pipe to pass through is opened, the feeding end of the lifting bucket is connected to the end of the circular tube of the feeding pipe, the feeding end of the lifting bucket is provided with a rubber bushing, the rubber bushing is arranged around the end of the circular tube of the feeding pipe, and the discharge end of the lifting bucket is fixed to the end cover of the ball mill Connection; the lifting bucket is provided with a cavity with an open inner end, and a plurality of inclined partitions are evenly distributed on the inner circumference of the cavity, and the partitions are fixedly connected to the three side surfaces of the inner wall of the cavity, and the connection between the partitions and the outer ends of the cavity is used as the rotating axis. The partitions rotate around the rotating axis 10°~20° in the horizontal direction, and the rotation direction is opposite to the rotation direction of the cylinder body. The included angle between the partitions of the sealing device and the vertical direction is 3°~8°, and the rotation direction is clockwise. The thickness of the partitions is 2cm~3cm.

[0007] As a further improvement, the horizontal plane rotation angle of the partition is preferably 15°.

[0008] As a further improvement, the angle between the partition and the vertical direction is preferably 5°.

[0009] As a further improvement, the thickness of the partition is preferably 2.5 cm.

[0010] As a further improvement, the discharge end of the lifting bucket is further provided with a flange, and the lifting bucket is fixedly connected to the end cover of the ball mill via the flange.

[0011] Compared with the prior art, the utility model has the following positive effects:

[0012] (1) After the slurry that flows back into the cavity of the sealing device is lifted to a certain height by the lifting bucket, it falls back into the feed pipe by gravity to reduce the overflow of the slurry;

[0013] (2) By setting a baffle with a specific inclination angle in the lifting bucket, the slurry falling into the cavity can be accurately sprinkled into the semicircular feed pipeline, further reducing the leakage of slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the feeding structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the horizontal angle of the partition of the utility model;

[0016] Figure 3 It is a schematic diagram of the vertical angle of the partition of the utility model.

[0017] In the figure, 1. feed pipe; 2. rubber bushing; 3. lifting bucket; 4. hollow shaft; 5. flange; 6. slurry; 7. ball mill end cover; 8. partition; 9. cavity. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments.

[0019] like Figure 1 A feeding structure of an overflow type ball mill comprises a feeding pipe 1 and a sealing device, wherein the feeding pipe 1 is a circular tube body, and its discharge end is a semicircular tube body opening upward; the sealing device comprises a lifting bucket 3 installed inside a hollow shaft 4 at the feeding end, on which a through hole is provided for the feeding pipe 1 to pass through, the feeding end of the lifting bucket 3 is connected to the end of the circular tube of the feeding pipe 1, the feeding end of the lifting bucket 3 is provided with a rubber bushing 2, and the rubber bushing 2 is arranged around the end of the circular tube of the feeding pipe 1; the discharge end of the lifting bucket 3 is also provided with a flange 5, and the lifting bucket 3 is fixedly connected to the end cover 7 of the ball mill through the flange 5.

[0020] like Figure 2 , Figure 3 As shown, the lifting bucket 3 is provided with a cavity 9 with an open inner end, and a plurality of inclined partitions 8 are evenly distributed on the inner circumference of the cavity 9. The angle setting of the partition 8 mainly considers two directions: one is to increase the lifting height of the slurry, and the other is to make the partition 8 act as a spiral structure to generate thrust on the slurry toward the inside of the cylinder. The partition 8 is fixedly connected to the three sides of the inner wall of the cavity 9, and the connection between the partition 8 and the outer end of the cavity 9 is used as the rotation axis. The partition 8 rotates around the rotation axis in the horizontal direction by 10°~20°, preferably 15°; the rotation direction is opposite to the rotation direction of the cylinder, and the angle between the partition 8 of the sealing device and the vertical direction is 3°~8°, and the rotation direction is clockwise, preferably 5°; the thickness of the partition 8 is increased to 2cm~3cm, preferably 2.5cm, to increase the service life of the partition 8.

[0021] Specifically, the lifting bucket 3 is fixedly connected to the end cover 7 of the ball mill through the flange 5, and the lifting bucket 3 rotates synchronously with the cylinder. The slurry entering the inner cavity of the lifting bucket 3 is lifted to a certain height under the action of the inclined partition 8, and then falls accurately into the inside of the feed pipe 1 under the action of gravity, thereby achieving effective sealing of the slurry. In this way, the sealing device can prevent the leakage of slurry at the feed end only by mechanical means; the partition 8 divides its inner cavity into multiple chambers, which can be used for pretreatment before the material enters the ball mill, which helps to prevent large pieces of ore from entering the ball mill and reduce equipment wear and blockage; in addition, multiple chambers help to guide the material into the best grinding position, reduce backflow and unnecessary material circulation, further reduce repeated impact of the slurry on the partition 8, and reduce the wear of the partition 8.

[0022] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. The scope of the present invention is defined by the claims rather than the above description.

Claims

1. An overflow type ball mill feeding structure, comprising a feeding pipe (1) and a sealing device, characterized in that: The feed pipe (1) is a circular tube, and its discharge end is a semicircular tube with an opening facing upward; The sealing device comprises a lifting bucket (3) installed inside the hollow shaft of the feed end, a through hole for the feed pipe (1) to pass through is opened on the lifting bucket (3), the feed end of the lifting bucket (3) is connected to the end of the round tube of the feed pipe (1), the feed end of the lifting bucket (3) is provided with a rubber bushing (2), the rubber bushing (2) is arranged around the end of the round tube of the feed pipe (1), and the discharge end of the lifting bucket (3) is fixedly connected to the end cover (7) of the ball mill; The lifting bucket (3) is provided with a cavity (9) with an open inner end, and a plurality of inclined partitions (8) are evenly distributed on the inner circumference of the cavity (9). The partitions (8) are fixedly connected to the three side surfaces of the inner wall of the cavity (9), and the connection between the partitions (8) and the outer end of the cavity is used as a rotation axis. The partitions rotate around the rotation axis by 10° to 20° in a horizontal plane, and the rotation direction is opposite to the rotation direction of the cylinder. The partitions (8) of the sealing device have an angle of 3° to 8° with the vertical direction, and the rotation direction is clockwise. The thickness of the partitions (8) is 2 cm to 3 cm.

2. The overflow ball mill feeding structure according to claim 1, characterized in that: The horizontal rotation angle of the partition (8) is preferably 15°.

3. The overflow ball mill feeding structure according to claim 1, characterized in that: The angle between the partition (8) and the vertical direction is preferably 5°.

4. The overflow ball mill feeding structure according to claim 1, characterized in that: The thickness of the partition (8) is preferably 2.5 cm.

5. The overflow ball mill feeding structure according to claim 1, characterized in that: The discharge end of the lifting bucket (3) is also provided with a flange (5), and the lifting bucket (3) is fixedly connected to the end cover (7) of the ball mill via the flange (5).

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