Method of improving the feed seal of a ball mill

Abstract

The application discloses a method for improving the sealing performance of a ball mill feeding device and belongs to the technical field of feeding device sealing. The method for improving the sealing performance of the ball mill feeding device is characterized in that a tensioning bolt is tightened to push a compression sleeve to move horizontally into a feeding port of the ball mill, an extrusion effect is generated on sealing material, the sealing material is tightly attached between a feeding elbow pipe, a feeding sleeve and the compression sleeve, and thus the leakage of the ore material is prevented. The application solves the problem that with the increase of the filling rate of the grinding medium, the ore pulp and the grinding medium are easily caused to leak at the feeding position under the driving of the rotation. The application sets a tensioning flange, a tensioning bolt, a compression sleeve, a feeding sleeve, a positioning stopper and sealing material outside the feeding elbow pipe, not only solves the problem that the feeding position of the ball mill is easily caused to leak, but also significantly improves the working efficiency and reliability of the equipment.

Description

Technical Field

[0001] This invention relates to the field of sealing technology for feeding devices, specifically a method for improving the sealing performance of ball mill feeders. Background Technology

[0002] Ball mills are crucial equipment for further pulverizing materials after initial crushing. By adding grinding media such as steel balls or ceramic balls into the mill cylinder, the rotation of the cylinder causes the grinding media to be carried to a certain height under the action of centrifugal force and friction before falling, impacting and grinding the material to produce a product with the required particle size. Ball mills are widely used in mineral processing plants, chemical industries, and construction. With the increasing demand for production efficiency, increasing the filling rate of the grinding media in the ball mill within a certain range can improve the grinding efficiency. However, a higher filling rate also makes the slurry and grinding media more prone to leakage at the feeding point due to the rotational action. Existing feeding methods, such as drum feeders, have complex structures, are difficult to maintain, have low feeding efficiency, and cannot completely prevent leakage. Summary of the Invention

[0003] The purpose of this invention is to provide a method for improving the sealing performance of ball mill feed. By setting a tension flange, tension bolts, clamping sleeve, feed sleeve, positioning block and sealing material outside the feed bend, not only is the problem of leakage easily occurring in the feed part of the ball mill solved, but the working efficiency and reliability of the equipment are also significantly improved. This brings significant economic and environmental benefits to mineral processing plants, chemical plants, construction and other fields, and solves the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A method for improving the sealing performance of a ball mill feedwater includes the following steps:

[0006] S1. Provides an arc-shaped feed bend that can extend horizontally into the ball mill feed inlet;

[0007] S2. A feed sleeve is fitted onto the horizontal section of the feed bend. One end of the feed sleeve is connected to the outer wall of the ball mill feed inlet through a flange, and the other end extends into the ball mill feed inlet.

[0008] S3. Fix a tensioning flange and a positioning block on the feed bend. The tensioning flange and the positioning block are located on both sides of the feed sleeve, and the positioning block is located inside the ball mill inlet.

[0009] S4. A compression sleeve is fitted onto the feed bend, and the compression sleeve extends between the feed bend and the feed sleeve. There is a distance between the compression sleeve and the pipe wall of the feed sleeve and the feed bend. The gap between the pipe walls is filled with sealant.

[0010] S5. A tensioning bolt is threaded onto the tensioning flange, and the tail end of the tensioning bolt is connected to one end of the compression sleeve.

[0011] S6. By tightening the tightening bolts, the clamping sleeve is pushed horizontally into the ball mill feed inlet, which compresses the sealing material, making the sealing material stick tightly between the feed bend, the feed sleeve and the clamping sleeve, thereby preventing the ore from leaking.

[0012] Preferably, there is a certain distance between the feeding sleeve and the positioning stop.

[0013] Preferably, the feed bend is made of high-strength wear-resistant alloy, and the curvature of the feed bend is determined according to the material flowability and the inlet angle of the ball mill.

[0014] Preferably, the tensioning flange is vertically welded to the horizontal position at the front end of the feed bend of the ore feed pipe, and the tensioning flange is provided with a certain number of threads for installing tensioning bolts.

[0015] Preferably, the positioning block is made of stainless steel and is welded to the outer wall of the feed bend.

[0016] Preferably, the feed sleeve is made of a wear-resistant metal tube with a smooth inner wall, and a flange is welded to one end of the feed sleeve for connecting to the ball mill inlet.

[0017] Preferably, the distance between the clamping sleeve and the feeding sleeve, and the distance between the clamping sleeve and the feeding bend, are both within the range of 6-10mm.

[0018] Preferably, the sealant is made of PTFE or a core-type material, which has good resilience, flexibility, wear resistance, high tensile strength and good chemical resistance.

[0019] Preferably, the method is applied to the MQY Φ4000mm×6000mm overflow ball mill;

[0020] The ball mill filling rate is 42%-43%, and the grinding media used include Φ30mm alumina ceramic balls, Φ25mm alumina ceramic balls, Φ20mm alumina ceramic balls, and Φ30mm steel balls.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention forms a novel and efficient sealing system by setting a tension flange, tension bolts, a compression sleeve, and a sealing material outside the feed bend. By tightening the tension bolts, the compression sleeve is pushed horizontally into the ball mill feed inlet, which compresses the sealing material, making it tightly adhere to the feed bend, feed sleeve, and compression sleeve, thereby preventing ore leakage and avoiding the adverse effects of frequent start-ups and shutdowns on equipment lifespan and energy consumption.

[0023] 2. This invention simplifies the sealing structure while ensuring the sealing effect, and enables quick maintenance, adjustment and replacement of sealing materials, thereby improving production efficiency. Attached Figure Description

[0024] Figure 1 This is a diagram of the ball mill feed seal structure of the present invention;

[0025] Figure 2 This is a connection diagram of the ball mill feed inlet of the ball mill feeding sealing device of the present invention;

[0026] Figure 3 This is a schematic diagram of the overall structure of the mill feeding device of the present invention.

[0027] In the diagram: 1. Feed bend; 2. Tensioning flange; 3. Tensioning bolt; 4. Compression sleeve; 5. Feed sleeve; 6. Positioning block; 7. Sealing material; 8. Ball mill inlet; 9. Feed hopper; 10. Feed trolley; 11. Ball mill end cover. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In existing technologies, the rotation of slurry and grinding media makes backflow and leakage at the feeding point more likely. Once backflow and leakage occur, shutdown is required. Frequent start-ups and shutdowns negatively impact equipment lifespan and energy consumption, leading to decreased production efficiency. Existing feeding methods, such as drum feeders, cannot completely prevent backflow and leakage, have complex structures, and low feeding efficiency. To solve these problems, please refer to [link / reference needed]. Figure 1-3 This embodiment provides the following technical solution:

[0030] A method for improving the sealing performance of a ball mill feedwater includes the following steps:

[0031] S1. Provide an arc-shaped feed bend 1;

[0032] Specifically, the outer diameter of the feed bend 1 is 428mm; the feed bend 1 is made of high-strength wear-resistant alloy to reduce the wear on the pipe wall during material conveying; the curvature of the feed bend 1 is determined according to the material flowability and the inlet angle of the ball mill, so that the feed bend 1 can extend horizontally into the feed inlet 8 of the ball mill, ensuring that the material enters the ball mill smoothly and maintains good sealing performance.

[0033] S2. A feed sleeve 5 is fitted onto the horizontal section of the feed bend 1. The feed sleeve 5 is made of wear-resistant metal pipe with smooth inner wall. One end of the feed sleeve 5 is welded with a flange and connected to the outer wall of the ball mill inlet 8 through the flange. The other end extends into the ball mill inlet 8.

[0034] S3. Fix a tensioning flange 2 and a positioning block 6 on the feed bend 1. The tensioning flange 2 and the positioning block 6 are located on both sides of the feed sleeve 5, respectively. The positioning block 6 is located inside the ball mill feed inlet 8. The tensioning flange 2 is vertically welded to the horizontal position at the front end of the feed bend 1.

[0035] The feed sleeve 5 and the positioning block 6 have a certain distance between them, which provides a certain deformation space for the sealing material 7. Since the equipment will experience temperature changes during operation, the certain distance allows the components to expand or contract to a certain extent, avoiding stress concentration or structural damage caused by material deformation, while also ensuring that the sealing effect is not affected. If the feed sleeve 5 directly contacts the positioning block 6, the relative movement between the two will accelerate the wear of the components, especially when the ball mill is repeatedly started and stopped. Maintaining a certain distance can reduce this unnecessary friction, help protect key components, and extend the service life of the entire device.

[0036] S4. A compression sleeve 4 is fitted onto the feed bend 1. The compression sleeve 4 extends between the feed bend 1 and the feed sleeve 5. The distance between the pipe walls of the compression sleeve 4 and the feed sleeve 5, as well as between the compression sleeve 4 and the feed bend 1, is within the range of 6-10mm. The gap between the pipe walls is filled with sealant 7.

[0037] Specifically, the sealant 7 is made of PTFE series or core-type materials, which have good resilience, flexibility, wear resistance, high tensile strength and good chemical resistance.

[0038] S5. Tensioning flange 2 is threaded with tensioning bolt 3, and the tail end of tensioning bolt 3 is connected to one end of compression sleeve 4.

[0039] Specifically, the tensioning bolts 3 are made of high-strength stainless steel, which ensures connection strength while having good corrosion resistance; the tensioning bolts 3 are evenly distributed on the tensioning flange 2.

[0040] S6. By tightening the tightening bolt 3, the clamping sleeve 4 is pushed horizontally into the ball mill feed inlet 8, which squeezes the sealing material 7, making the sealing material 7 stick tightly between the feed bend 1, the feed sleeve 5 and the clamping sleeve 4, thereby preventing the ore from leaking.

[0041] This method is applied to the MQY Φ4000mm×6000mm overflow ball mill, where the ball mill filling rate is 42%-43%, and the grinding media used include Φ30mm alumina ceramic balls, Φ25mm alumina ceramic balls, Φ20mm alumina ceramic balls, and Φ30mm steel balls. During normal feeding, the slurry surface partially submerges the lower edge of the feed bend 1, avoiding intermittent feeding problems caused by slurry surface fluctuations and helping to maintain a uniform distribution of grinding media inside the ball mill.

[0042] After one end of the feed bend 1 is connected to the ball mill feed inlet 8, the other end is connected to the feed box 9 through a flange. The feed box 9 is welded and fixed to the feed trolley 10.

[0043] Working Principle: This method uses a specially designed arc-shaped feed bend 1, ensuring it extends horizontally into the ball mill inlet 8. A tensioning flange 2 is fixed to the front end of the feed bend 1 and is equipped with tensioning bolts 3. A positioning stop 6 is welded to the outer wall of the feed bend 1 to limit its position. One end of the feed sleeve 5 is connected to the ball mill inlet 8 via a flange, and the other end extends into the interior, maintaining a certain distance from the positioning stop 6. A clamping sleeve 4 is placed between the feed bend 1 and the feed sleeve 5, with a sealant 7 filling the space between them. The sealant 7 is made of a material with good resilience and wear resistance, such as PTFE or a core-type sealant. When the tensioning bolts 3 are tightened, the clamping sleeve 4 is pushed horizontally, applying pressure to the sealant 7, causing it to tightly adhere to the feed bend 1, feed sleeve 5, and clamping sleeve 4, thus forming an effective sealing barrier to prevent material leakage. This structure is simple and easy to maintain, adjust, and replace the sealant 7, improving production efficiency and reducing the adverse effects of equipment start-up and shutdown.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A method for improving the sealing performance of a ball mill feed, characterized in that, Includes the following steps: S1. Provide an arc-shaped feed bend (1) that can extend horizontally into the ball mill feed inlet (8); S2. A feed sleeve (5) is fitted onto the horizontal section of the feed bend (1). One end of the feed sleeve (5) is connected to the outer wall of the ball mill inlet (8) through a flange, and the other end extends into the ball mill inlet (8). S3. Fix a tensioning flange (2) and a positioning block (6) on the feed bend (1). The tensioning flange (2) and the positioning block (6) are located on both sides of the feed sleeve (5), and the positioning block (6) is located inside the ball mill inlet (8). S4. A compression sleeve (4) is fitted onto the feed bend (1). The compression sleeve (4) extends between the feed bend (1) and the feed sleeve (5). There are gaps between the compression sleeve (4), the feed sleeve (5), and the pipe wall of the feed bend (1). The gaps between the pipe walls are filled with sealant (7). S5. Tensioning flange (2) is threaded with tensioning bolt (3), and the tail end of tensioning bolt (3) is connected to one end of compression sleeve (4); S6. By tightening the tightening bolt (3), the pressing sleeve (4) is pushed horizontally into the ball mill feed inlet (8), which generates a squeezing effect on the sealing material (7), so that the sealing material (7) is tightly attached between the feed bend (1), the feed sleeve (5) and the pressing sleeve (4), thereby preventing the leakage of ore. The feed bend (1) is made of high-strength wear-resistant alloy. The curvature of the feed bend (1) is determined according to the material flowability and the inlet angle of the ball mill. There is a gap between the feed sleeve (5) and the positioning block (6). The distance between the clamping sleeve (4) and the feed sleeve (5) and the distance between the clamping sleeve (4) and the feed bend (1) are both in the range of 6-10mm.

2. The method for improving the sealing performance of a ball mill feed according to claim 1, characterized in that, The tensioning flange (2) is vertically welded to the horizontal position at the front end of the feed bend (1), and the tensioning flange (2) is threaded for installing the tensioning bolt (3).

3. The method for improving the sealing performance of a ball mill feed according to claim 2, characterized in that, The positioning block (6) is made of stainless steel and is welded to the outer wall of the feed bend (1).

4. The method for improving the sealing performance of a ball mill feed according to claim 3, characterized in that, The feed sleeve (5) is made of wear-resistant metal tube with smooth inner wall. One end of the feed sleeve (5) is welded with a flange for connecting to the ball mill feed inlet (8).

5. A method for improving the sealing performance of a ball mill feed according to claim 4, characterized in that, The sealant (7) is made of PTFE series or with adhesive core series.

6. The method for improving the sealing performance of a ball mill feed according to claim 5, characterized in that, The method is applied to the MQY Φ4000mm×6000mm overflow ball mill; The ball mill filling rate is 42%-43%, and the grinding media used include Φ30mm alumina ceramic balls, Φ25mm alumina ceramic balls, Φ20mm alumina ceramic balls, and Φ30mm steel balls.

Images