A material returning device for a ball mill

Abstract

The utility model relates to ball mill with return device technical field, and disclose a kind of ball mill with return device, including return device main body, the return device main body is installed in the right side position of feeding screw cylinder, and the return device main body is by several steel sheets, bolt, washer, nut, center sieve plate, the steel sheet includes first steel sheet, second steel sheet, third steel sheet, fourth steel sheet, the bolt includes first bolt and second bolt, the washer includes first washer and second washer.The utility model ball mill with return device, backflow air current is reduced by diffusion through sieve plate micropore, avoid forming turbulent flow to cause material spatter, prevent fine powder to escape, the structure effectively isolates the direct impact of steel ball to screw cylinder, prolongs feeding end life, and reduces overflow loss.

Description

Technical Field

[0001] This utility model relates to the technical field of return material devices for ball mills, specifically a return material device for ball mills. Background Technology

[0002] Ball mills are key industrial equipment for pulverizing materials after crushing. They use rotating cylinders to drive grinding media such as steel balls or steel rods to impact, squeeze, and grind materials. They are widely used in industries such as cement, mineral processing, and chemicals.

[0003] A ball mill mainly consists of a cylindrical body, end caps, bearings, and a transmission device. The cylinder is filled with steel balls or steel rods, occupying 25%-50% of its effective volume, as grinding media. During operation, the cylinder rotates, causing the grinding media to rise and fall, pulverizing the material through the combined action of impact, extrusion, and grinding forces. A hollow journal supports the cylinder's rotation, and the liners are made of wear-resistant materials such as high-manganese steel to extend their service life.

[0004] During operation, the ball mill first performs preliminary grinding on the slurry formed by materials with a particle size of 16mm or less and water. After preliminary grinding, most of the material has a particle size of 7.5mm or less, with a smaller portion between 7.5mm and 12mm. The ball mill is equipped with an outlet drum screen with a 7.5mm aperture. Material with a particle size of 7.5mm or less passes through the outlet drum screen into the slurry tank, while material with a particle size between 7.5mm and 12mm is returned via a return material device.

[0005] However, existing ball mills have problems such as material or steel balls easily overflowing from the feed inlet and steel balls impacting the feed screw. Therefore, there is an urgent need for a ball mill return device to solve the above technical problems. Utility Model Content

[0006] The purpose of this invention is to provide a return material device for a ball mill to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A return material device for a ball mill includes a return material device body installed on the right side of the feed screw cylinder. The return material device body is composed of several steel plates, bolts, washers, nuts, and a central screen plate. The steel plates include a first steel plate, a second steel plate, a third steel plate, and a fourth steel plate. The bolts include a first bolt and a second bolt. The washers include a first washer and a second washer. The second steel plate is located on both sides of the first steel plate, and the third steel plate is located at one end of the second steel plate. A central screen plate is installed on the left side of the first steel plate. The fourth steel plates are symmetrically arranged on the left and right sides of the return material device body. A first bolt, a first washer, and a first nut are provided at each of the four positions (top, bottom, left, and right) of the return material device body. A second bolt, a second washer, and a second nut are provided on the fourth steel plate.

[0009] Preferably, the main body of the return material device is installed at the junction of the feed screw outlet side and the cylindrical body of the ball mill, and is fixed by four sets of support points.

[0010] Preferably, the main body of the return material device consists of two semi-circular conical cylinders, a central screen plate, a mounting steel plate, nuts, washers, and bolts.

[0011] Preferably, the flared side of the main body of the return material device faces the cylindrical cylinder of the ball mill, and the narrow side is provided with a central sieve plate facing the feed screw.

[0012] Preferably, the ball mill is mainly composed of a cylindrical body, end caps, bearings and transmission device, and the body is filled with steel balls or steel rods accounting for 25%-50% of the effective volume as grinding media.

[0013] Preferably, the ball mill is equipped with an outlet drum screen with an aperture of 7.5 mm.

[0014] Compared with existing technologies, this invention has the following advantages: After being blocked by the central sieve plate, the steel balls fall back into the grinding zone of the cylinder under the coupling effect of gravity and centrifugal force along the conical guide surface, avoiding accumulation at the spiral cylinder outlet; at the same time, the backflow airflow is decelerated and diffused through the micropores of the sieve plate, avoiding the formation of turbulence that could cause material splashing and preventing fine powder from escaping. This structure effectively isolates the direct impact of the steel balls on the spiral cylinder, extends the life of the feed end, and reduces overflow loss. Attached Figure Description

[0015] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the installation structure of the return material device for ball mills according to this utility model;

[0017] Figure 2This is a schematic diagram of the overall structure of the return material device for ball mills according to this utility model;

[0018] Figure 3 This is a partial structural schematic diagram of the return material device for a ball mill according to this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the fourth steel plate of this utility model;

[0020] In the diagram: 1. First steel plate; 2. Second steel plate; 3. Third steel plate; 4. First bolt; 5. First washer; 6. First nut; 7. Central screen plate; 8. Fourth steel plate; 9. Second bolt; 10. Second washer; 11. Second nut; 12. Feed screw drum; 13. Main body of return material device. Detailed Implementation

[0021] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings. In the embodiments of the present utility model, the different types of cross-sectional lines are not labeled according to national standards, nor do they specify material requirements for the components; they are used to distinguish the cross-sectional views of the components in the drawings.

[0022] Please see Figure 1-4 A return material device for a ball mill includes a return material device body 13, which is installed on the right side of the feed screw cylinder 12. The return material device body 13 is composed of several steel plates, bolts, washers, nuts, and a central screen plate 7. The steel plates include a first steel plate 1, a second steel plate 2, a third steel plate 3, and a fourth steel plate 8. The bolts include a first bolt 4 and a second bolt 9. The washers include a first washer 5 and a second washer 10. The second steel plate 2 is located on both sides of the first steel plate 1, and the third steel plate 3 is located at one end of the second steel plate 2. The central screen plate 7 is installed on the left side of the first steel plate 1. The fourth steel plate 8 is symmetrically arranged on the left and right sides of the return material device body 13. The first bolt 4, the first washer 5, and the first nut 6 are provided at the top, bottom, left, and right positions of the return material device body 13. The second bolt 9, the second washer 10, and the second nut 11 are provided on the fourth steel plate 8.

[0023] The main body 13 of the return material device is installed at the junction of the feed screw 12 outlet side and the cylindrical body of the ball mill, and is fixed by four sets of support points.

[0024] The main body 13 of the return material device consists of two semi-circular conical cylinders, a central screen plate, a mounting steel plate, nuts, washers and bolts.

[0025] The main body 13 of the return material device has its flared side facing the cylindrical cylinder of the ball mill, and its narrow side is equipped with a central sieve plate facing the feed screw cylinder 12.

[0026] The ball mill mainly consists of a cylindrical body, end caps, bearings, and transmission devices. The cylinder is filled with steel balls or steel rods, which occupy 25%-50% of the effective volume, as grinding media.

[0027] The working principle and usage process of this utility model: This ball mill return device can solve the problems of material or steel balls overflowing from the feed inlet and the impact of steel balls on the feed screw.

[0028] Structural Description: This device is installed at the junction of the feed screw 12 outlet side and the cylindrical body of the ball mill. It is installed and fixed by four sets of support points. The device consists of two semi-conical cylinders, a central screen plate 7, a mounting steel plate, nuts, washers, and bolts. The flared side faces the cylindrical body of the ball mill, and the narrow side is equipped with a central screen plate facing the feed screw 12.

[0029] When the ball mill is operating normally, the material and steel balls will generate a reverse backflow. Under the action of dynamic pressure difference, the backflowing steel balls and material are carried to the constricted end of the return device. After being blocked by the central sieve plate 7, the steel balls fall back into the grinding zone of the cylinder under the coupling of gravity and centrifugal force along the conical guide surface, preventing accumulation at the outlet of the feed screw cylinder 12. Simultaneously, the backflow airflow is slowed and diffused through the micropores of the central sieve plate 7, preventing turbulence that could cause material splashing and preventing fine powder from escaping. This structure effectively isolates the direct impact of the steel balls on the feed screw cylinder 12, extends the life of the feed end, and reduces overflow loss.

[0030] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0031] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A return material device for a ball mill, comprising a return material device body (13), characterized in that: The main body (13) of the return material device is installed on the right side of the feed screw drum (12), and the main body (13) of the return material device is composed of several steel plates, bolts, washers, nuts, and a central screen plate (7). The steel plates include a first steel plate (1), a second steel plate (2), a third steel plate (3), and a fourth steel plate (8). The bolts include a first bolt (4) and a second bolt (9). The washers include a first washer (5) and a second washer (10). The second steel plate (2) is disposed on the first steel plate (1). The third steel plate (3) is located on one end of the second steel plate (2). A central screen plate (7) is installed on the left side of the first steel plate (1). A fourth steel plate (8) is symmetrically arranged on the left and right sides of the main body (13) of the return device. A first bolt (4), a first washer (5) and a first nut (6) are provided at the four positions of the main body (13) of the return device. A second bolt (9), a second washer (10) and a second nut (11) are provided on the fourth steel plate (8).

2. The ball mill return device according to claim 1, characterized in that: The main body (13) of the return material device is installed at the junction of the feed screw (12) outlet side and the cylindrical body of the ball mill, and is fixed by four sets of support points.

3. The ball mill return device according to claim 1, characterized in that: The main body (13) of the return material device consists of two semi-circular conical cylinders, a central screen plate, a mounting steel plate, nuts, washers and bolts.

4. The ball mill return device according to claim 1, characterized in that: The main body (13) of the return material device has its flared side facing the cylindrical cylinder of the ball mill, and its small side is provided with a central sieve plate facing the feed spiral cylinder (12).

5. A return material device for a ball mill according to claim 1, characterized in that: The ball mill is mainly composed of a cylindrical body, end caps, bearings and transmission device. The cylinder is filled with steel balls or steel rods, which occupy 25%-50% of the effective volume, as grinding media.

6. The ball mill return device according to claim 1, characterized in that: The ball mill is equipped with an outlet drum screen with an aperture of 7.5 mm.

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