Ball Mill

Ball Mill Maintenance And Treatment Measures

Cause Analysis and Key Treatment Measures of Typical Faults in Maintenance of Ball Mills . The ball mill is an indispensable abrasive device in many mining companies and an important basis for ensuring that industrial production is carried out normally. The daily maintenance of the ball mill is very important. For the typical failures encountered in the production of ball mills, this paper analyzes the reasons in detail and gives targeted technical measures.

Bearing part temperature overheat fault

The bearing bush is a key part of the ball mill. The problem that often arises is that the temperature is overheated, resulting in abnormal performance. In general, its complexity mainly involves the following situations:

  1. Small gap between hollow shafts of raw material inlet. The required abrasive in the ball mill, about 90% of the power will be converted into heat energy, which is part of, together with the abrasive's own temperature, the two together lead to axial deformation of the drum body, and then cause thermal expansion, With the cold shrinkage caused by the shutdown, these factors may cause the bearing shell to be heated due to axial forces. Based on this, in the process of installation, it is necessary to consider the whole and reasonably control the amount of expansion. It cannot be too large nor too small.
  2. lack of precision in the bushing scraping. In a smelting mill, the scraping range of its hollow shaft bearing bushes needs to be controlled according to the actual production requirements, and the contact wrap angle is controlled to be less than 35[deg.], and two sides of it need to be scraped with gaps. The spot distribution of the contact should be distributed along the entire length of the busbar and be evenly distributed. There should be no excessive imbalance, and the spacing of the spots must have corresponding data requirements. There is an oil groove inside the contact angle scraper, but it should be noted that this oil groove cannot be scraped.
  3. The correct selection and use of lubricating oil. Lubricating oil is an indispensable material in the use of the bearing shell, and it is the key to ensure the normal operation of the bearing bush. Therefore, for production managers, the selection of lubricants should be reasonable, and it is necessary to select the appropriate lubricant as much as possible according to the actual requirements of the manufacturer, and ensure that it can meet the actual production requirements.
  4. Bad connection between spherical and spherical seats. Spherical tile is different from other structures, it also has the function of automatically adjusting both the hollow shaft and the coaxiality of the bearing shell. In general, after the assembly of the spherical seat and the spherical roof tile, for its contact spot distribution, a continuous and uniform distribution should be ensured, and the spacing should be set properly.
Ball Mill Main Bearing Ball Mill

If the contact between the spherical back and the susceptor is not very good, it will directly lead to a small area of the contact between the tile surface and the hollow journal. The load of static load is large, and the local high temperature of the base of the bearing base will also occur. situation.

At this time, during the installation process, the spherical outer spherical surface needs to be repeatedly polished and scraped. This is to ensure that the outer spherical surface is smooth and not rough, and it can also be flexibly rotated in the concave spherical surface of the base. The role, and then effectively play the role of self-aligning, so that it can also ensure that the spherical tile and spherical seat between the tight and reasonable.

In the traditional ball mill structure of the past, the main bearing was sealed with a fine wool felt ring, which was very easy to wear, and the dust particles entered the main bearing after the wear occurred between the wool felt ring and the hollow shaft.

This method is also the key reason for the current abrasive wear on the ball bearings and the blockage of the oil path. Therefore, when it is inspected, it is necessary to check the wear condition of the seal ring in time. If the degree is serious, it must be replaced with new ones to block the dust.

Many manufacturers have also made improvements on this basis. In order to prevent oil from leaking, the main bearing part adopts a more advanced piston seal.

Installation Points for Turning Large Ring Gears

Implementation of design specifications

In the actual work, we need to disassemble the original bull gear, always ensure the integrity of the screw hole and the upper and lower surfaces, open the part of the gear to release the stress, and then re-research on the two sides of the opposite surface, pin hole and screw hole. Remove excess burrs and scratches.

In addition, the hole diameter of the screw hole needs to be measured separately, and the size and number of each hole diameter obtained by the measurement are processed and bolted respectively. After these processes are completed, the installation is performed and the installation is performed in accordance with the established numbering sequence. Do not confuse disorder.

Engagement between gears

The pinion gear needs to be coated with red lead oil on at least four gears, and then turn the grinding machine to observe the contact area and azimuth size of the two gears in real time during the rotation. The correct meshing position of each gear needs to be installed on the pitch circle wire. Above.

During the installation process, professional technicians should observe the operation of the gears in real time. If it is possible, the idle running time can be reasonably extended until it can be used normally.

Troubleshooting of cylinder cracks

cracks in the welding process of the cylinder

If there is a phenomenon of unqualified quality at this stage, it will directly lead to the fracture of the welding seam. If the solution to this problem is delayed, the welding stress will be too large and cracks will appear.

For the staff, through the analysis of the bending stress and shear stress of the cylinder body, it can be known that the largest part of the force is in the two ends of the cylinder, and the angle contact formed by the two is a right angle. The location can easily lead to stress concentration, and then fracture cracking problems, so we need to do a good job welding.

Cracks at Work

In the normal working process of the cylinder, once the bolts have loosened or the liners fall off, they must be replaced at the first time. If the treatment is not done properly, the cylinder will crack. After cracks occur, take measures to be neat, and ensure that the position of the cylinder is correct before starting the next step.

After the grinding and welding process is completed, the root of the weld must be removed from the inside of the grinding and the welding is performed at the same time. The specific welding frequency is about three times. In the welding process, the weld seam needs to be struck. The number of strokes is more than four times. This can effectively eliminate the existence of stress and ensure good welding work.

During the operation of the ball mill affected by external factors, there will be a variety of failures, analyze the causes of the failure, and then take correct and reasonable technical measures to ensure the normal performance of the ball mill to ensure smooth production is fundamental. What problems have you encountered during the operation of your equipment? Welcome message communication.

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