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Recently, some customers have been asked about the problem of slurry leakage in the ball mill. It indicates that the ball mill seals used in the concentrator have leaked, which caused a series of problems such as erosion of the inner wall and burning of tiles. I don’t know how to solve it. Seek solutions from us. After the on-site inspection, it was found that the leakage was mostly caused by the daily maintenance and maintenance of the equipment. After the installation of the ball mill of the factory, the inspection of the bolts was not careful, and some of the bolt fasteners were not tightened and inspected, which caused the slurry to enter the joint surface after the ball mill was fed, causing the leakage problem. In fact, ball mill slurry leakage is a very common problem, but it is not an inevitable problem. In order to prevent the ball mill from frequently leaking during the application process, I can prevent it in advance through technical methods. Here we have sorted out some common leaks of ball mills. Pulp problems, and some prevention methods are summarized for each problem.
The first The slurry between the feed tube and the feed bushing of the ball mill is generally used. The seal device of the conventional ball mill equipment is mostly sealed with a packing. During the running process, the feed chute is in a static state, but The feed bushing is connected with the tank body for rotation. When the liquid level in the ball mill cylinder is higher than the lower level of the feed port, the slurry will enter the junction of the feed chute and the feed bushing, causing the feed port to leak. Pulp. In addition, during use, the feed bushing is always rotating, and the long-term rotation causes the packing to wear. When the wear is severe, the sealing effect is lost, which leads to slurry leakage.
In view of the above leakage problem, we can prevent it in advance by the following three steps:
(1) Firstly add a smooth transition casting with a thin upper wall thickness to the feed chute, and the surface contacting the cylinder is mechanically processed to ensure the processing precision and cylindricity of the contact cylindrical surface, and at the same time, improve the processing precision of the contact surface. To reduce the wear of the packing;
(2) Providing a VD sealing ring to the inner side of the packing seal, and fixing it, which can double seal and prevent leakage;
(3) Installing mechanical seals and multi-layer protection at the feed chute can effectively solve the problem of slurry leakage.
The second, the ball bushing between the feed bushing and the end cap of the ball mill has two kinds of sealing bushings and end caps: one is three packing seals, one end of the seal depends on the feeding bushing and the end cap The groove is positioned, and the bushing is in full contact with the flange at the end cap, and is fastened by bolts, but the friction between the two is generated, and the other end is sealed by excess of the packing, during assembly and operation. If the anchor is not well positioned, or the packing is worn, it will cause the ball mill to leak. The second type is a cone seal. The end of the seal is the same as the packing of the packing. It is positioned by the stop and the other end is positioned and sealed by the pressing action of the cone seal. However, unlike the packing seal, the feed bushing and the end cap are different. The flange connection needs to have a gap of 3 to 4 mm, so that there is no friction between the bushing and the flange surface of the end cover, which causes distortion due to long-term rotation, causing the connecting bolt to move, thereby causing leakage of the cone seal. Pulp phenomenon.
In view of the above-mentioned leakage problem, the prevention method is as follows: the sealing method of the three-way packing can improve the processing precision of the feeding bushing and the flange surface of the end cover by the abrasive belt grinding method, and the flange of the feeding end cover On the surface, an O-shaped groove can be installed, and an O-type seal is arranged on the flange joint surface of the feed bushing and the feed end cover to realize a double seal, thereby solving the slurry leakage problem. For the cone seal structure, this type of seal is not recommended for small series, mainly because the link bolts of the sealed feed bushing and the end cover are prone to breakage and frequent slurry leakage.
The third, the ball mill end cap and the barrel between the slurry ball mill end cap and the barrel between the leakage is mostly because:
1. The processing precision of the end cap flange and the cylinder flange is not high, and the flange joint will leak after the assembly operation after the high point is repaired;
2. During the on-site installation process, the bolts installed in the factory are not re-tightened and tested, and the slurry enters the joint surface after charging, resulting in the occurrence of slurry leakage;
3. The rubber lining of the ball mill is generally installed on site. The end cover and the cylinder are not tightened and tested according to the requirements before installation. When the rubber lining is laid, the lap joint treatment at the joint surface is not good, resulting in leakage. For this kind of slurry leakage, it is necessary to prevent it in advance. Firstly, it can be started by increasing the combination of the end cap and the flange of the cylinder. The operation method is processing precision. Secondly, when assembling the ball mill in the factory or on the site, the contact surface between the end cap and the flange should be cleaned to ensure that there are no bumps, scratches, etc. on the flange surface. After the inspection, the method can be used. Apply a layer of yellow dry oil or black lead powder to the surface to increase its smoothness. At the end of the assembly, the bolt tightening during assembly should be strictly controlled, and tightened according to the specified bolt torque to ensure that the end cap and the flange flange joint surface are tightly combined. Note: When the ball mill is assembled at the site of the plant, the end caps and the flange bolts of the cylinders should be evenly tightened according to the “Technical Specifications for Electric Power Construction” to ensure that the joints of the end caps and the flanges of the cylinders are tightly combined. For ball mills with rubber linings, the linings need to be installed on site, so before installation, the end caps and cylinders must be bolted for inspection as required. The above are several kinds of slurry leakage conditions common in ball mills, which are often found in structural design, machining, quality control and installation. We can optimize the above aspects and improve quality control before use. Remember to follow the installation process strictly to prevent leakage problems.
