Shaft fracture is a common fault in practical use. In case of shaft fracture, the barite ore mill will stop working immediately. Its maintenance is complex and must be paid great attention. Causes and Countermeasures:

1. Long time metal fatigue or poor shaft material. The shaft of barite ore mill is a kind of metal material, which is subjected to the combined torque of torque and repeated impact force for a long time in the process of use.

2. Under the action of long-term impact torque, the material inside the shaft will gradually produce fatigue. When the fatigue limit is reached, it will produce fracture. In addition, there are great differences in torsional strength of different materials. If the material is poor, it will inevitably lead to low flexural strength and fatigue limit, and it is easy to damage.

When the amount of ore feed is significantly insufficient, the sound of the impact of the liner and the steel ball will occur, resulting in the loss of the grinding medium and the liner.

When the amount of ore is unchanged, the increase or decrease of the particle size of the ore will also produce a similar phenomenon as when the amount of ore is large or reduced.

Therefore, during normal operation of the LUM ultrafine vertical mill, it is necessary to ensure that the feed is uniform and the particle size is uniform, and it cannot fluctuate too much.

Only in this way can a good production index be obtained. Whether the LUM ultrafine vertical mill can be fed to the mine evenly depends on the operator’s constant observation.

Once they buy it back, they will find all kinds of faults and carry out continuous maintenance, which not only affects the production line of barite grinding equipment, but also consumes a lot of money.

The purchase of barite grinding mill is not so easy. Now many small manufacturers cheat consumers under the banner of well-known manufacturers, and many people are deceived.

Therefore, when purchasing barite grinding equipment, we must compare them, select well-known manufacturers, and pay attention to after-sales service.

In this way, we can repair the equipment in time in case of equipment failure, which reduces a lot of trouble. The principle of barite grinding mill is not as simple as expected. There are many things to pay attention to when purchasing equipment.

In addition, the contact mode between media and materials and between media also has a great influence. Although spherical medium is widely used in China, because its crushing mode is mostly point contact and the crushing force is large, it is also easy to lead to over crushing.

The rolling property of cylindrical medium is slightly worse than that of steel ball, but due to line contact, there is less over crushing. Therefore, it is suitable for coarse grinding rather than fine grinding.

Vertical roller mill lining plate is mainly used to protect the cylinder and avoid damage to the cylinder caused by direct impact and friction of media and materials. Because of its long-term contact with media and materials, it is easy to be damaged.

During this period, the current of the main motor has no abnormal fluctuation, the lubrication of each lubrication point is normal, there is no oil leakage, ore leakage and water leakage, and the temperature of the main bearing is maintained at about 53 ℃.

After the operation state of the ultrafine mill's load test run meets the specified requirements of the test run, the load test run of the ultrafine mill shall be ended.

In the beneficiation production process, the test results of the ultrafine mill can directly affect the grinding quality and efficiency of the ultrafine mill in the later production.

The success rate of ultrafine mill commissioning can be greatly improved by adopting the phased commissioning process.

Preparation stage before calcite grinder milling plant machine commissioning commissioning preparation refers to the need to check whether all parts meet the requirements of commissioning before starting the calcite grinder milling plant machine.

The main contents to be checked include lubrication, cooling, heating, sealing and fastening of various components. The calcite grinder milling plant machine commissioning can be started only after the person in charge of each department ensures that all parts meet the conditions for commissioning.

SBM wet overflow calcite grinder milling plant machine is selected for the full slime cyanidation project of SBM Indonesia 1000t / D gold mine. In the preparation stage of commissioning, SBM commissioning staff carefully inspected the calcite grinder milling plant machine.

If the consumption is too large, the loading capacity will be further increased and the output will be reduced. Besides the rated output, there will be ore discharge and stone discharge. In this case, the filling rate of cement raw material milling steel ball shall be checked according to the actual situation of the concentrator. 

Generally, the appropriate filling rate of steel ball is 20% ~ 40% of the volume of cement raw material milling, and the average stacking specific gravity of steel ball is about 4.6t/m3. 

The steel ball ratio of cement raw material milling is unreasonable. The steel ball ratio of cement raw material milling refers to the proportion of large, medium and small diameters of steel balls in cement raw material milling. Each cement raw material milling has a reasonable steel ball ratio range.

The quality of materials processed by vertical roller mill is poor and there are many material impurities: when the materials processed by vertical roller mill contain sediment and other impurities, especially when there is a large amount of sediment, the material concentration in vertical roller mill will become higher and the material fluidity will become worse, resulting in stone discharge in the discharge of vertical roller mill operation. 

It can be improved by increasing the make-up water and reducing the ore feeding. Poor grindability: quartz stone is mainly composed of SiO2, with high hardness and poor grindability. Therefore, the impact force can be increased by increasing the steel ball diameter to increase the steel ball weight. 

At the same time, the feeding amount should be reduced, the output of vertical roller mill should be reduced, and the residence time of quartz in vertical roller mill should be prolonged to improve the grindability of materials. 

Generally, the insufficient cooling of Raymond mill bearing is reflected in the blockage of lubricating oil pipeline, improper selection of cooler, poor cooling effect, etc.

The cooler of lubrication pipeline is scaling and blocked, which will lead to poor cooling effect and increase of bearing temperature, especially in the production process in summer.

Solution: for the insufficient cooling of Raymond mill bearing, check whether the pipeline is blocked and whether the oil inlet temperature and return water temperature exceed the standard.

If the cooler is blocked by scaling, the effective treatment method is to acid clean the cooler before summer every year; If the cooler is improperly selected and the cooling effect cannot meet the requirements, the cooler shall be replaced in time or a new cooler shall be installed in parallel.

If it is not handled in time, it will reduce the service life of the vertical roller mill bearing, increase the maintenance cost, even cause the bearing to burn out, affect the operation of the whole concentrator system, and cause economic losses to the concentrator. 

There are many reasons for the excessive temperature rise of vertical roller mill bearing. It is necessary to analyze and find out the reasons and "suit the remedy to the case" to ensure the continuous and safe operation of ball equipment. 

The vertical roller mill bearing is poorly lubricated, and the lubrication system can protect the vertical roller mill bearing from metal modification and foreign matter intrusion, which can play a sealing role; It can eliminate friction heat, reduce friction and wear, prevent excessive bearing temperature rise and prolong bearing life.