When the mini cement plant is running under a low load state, it is necessary to adjust the ore input of the mini cement plant in time to ensure the grindability of the material. In addition to the four wear reasons described above, the design, manufacture and installation of the mini cement plant liner are also one of the reasons that affect the rapid wear of the mini cement plant liner.

To improve the use efficiency of the mini cement plant liner , It is necessary to analyze the cause of the wear of the lining plate in order to formulate a reasonable solution.

If the material of the liner is not properly selected, its fatigue strength and life will be greatly reduced, and it will not only fail to meet the requirements of the mini cement plant. And even plastic deformation or bulging may occur. Corresponding method: Choose a new type of wear-resistant lining material.

The material of the liner of the mini cement plant is unreasonable. The material of the liner of the mini cement plant and its heat treatment process are the keys to determine the mechanical properties of the liner. 

If the material of the liner is not properly selected, its fatigue strength and life will be greatly reduced, and it will not only fail to meet the requirements of the mini cement plant. And even plastic deformation or bulging may occur. Corresponding method: Choose a new type of wear-resistant lining material. 

Currently, the commonly used mini cement plant lining materials include high manganese steel, high chromium steel, alloy steel and wear-resistant rubber. Among them, wear-resistant rubber is a newly emerging lining material in the past 10 years. A composite lining can be formed by using wear-resistant rubber and alloy steel, which not only improves the toughness of the lining, but also solves the contradiction between its toughness and stiffness.

In order to reduce the temperature in the mill and improve the grinding efficiency, a small amount of mist water can be sprayed into the grinding bin to lower the temperature in the mill to below 50°C.

The amount of grinding aid is unreasonable. Under the premise of not harming the performance of the product, a small amount of grinding aid can be added, which can not only accelerate the crack propagation in the crushing of materials, reduce the mutual bonding between fine powders, and effectively improve the performance of the powder.

Grinding efficiency, but also improve the energy-saving efficiency of the bentonite milling machine. However, grinding aids for bentonite milling machines should be added in accordance with the national standards. In general cement production process, the amount of grinding aids added should not exceed 1%. The proportion of grinding aids for other materials can be inquired through the national standards.

The ventilation of the bentonite milling machine is not good. Under the normal operation of the bentonite milling machine, due to the repeated impact and friction of the medium in the cylinder, the temperature in the mill continues to rise, causing the water-containing materials to generate water vapor. If the ventilation effect of the bentonite milling machine is not good, the water vapor cannot be discharged in time.

Water vapor will adhere to the bentonite milling machine liner and steel balls, resulting in paste ball or paste grinding phenomenon. Therefore, it is necessary to control the ventilation volume of the bentonite milling machine. The passing effect of the bentonite milling machine is good, which can not only bring out qualified fine materials in time, but also effectively reduce the phenomenon of over-grinding and reduce the temperature of the bentonite milling machine.

The feeding of the bentonite milling machine is unreasonable. During the operation of the bentonite milling machine, uniform feeding is a necessary condition to ensure the normal operation of the bentonite milling machine. If the feeding is too small, the impact of the steel balls of the bentonite milling machine will increase, resulting in waste of media; if the bentonite milling machine is fed too much material , it will cause insufficient grinding capacity of the bentonite milling machine, resulting in saturation, so it is necessary to strictly follow the feeding standard for feeding.

The force distribution should be greater than 70%. When running empty, if the lubricating oil system works normally and no oil leakage occurs, the dolomite powder machine runs smoothly without obvious noise, the vibration value of the main bearing, motor and pinion does not exceed 0.1mm, and there is no obvious damage or hot phenomenon of each part. The empty car runs normally.

During the test run of the dolomite powder machine under load, according to the proportion of the dolomite powder machine, a certain amount of steel balls are added to the barrel of the dolomite powder machine, and the steel balls are added in batches. During the operation process, the bearing temperature, current, and vibration intensity are measured.

After the dolomite powder machine is installed, start running with load, add 70% of the specified load to the grinding material, and continue to run for more than 10 hours. During the process, the threaded joints of the dolomite powder machine lining should be tightened and the threaded connections should be checked frequently to prevent loosening.

The inspection work before the debugging of the dolomite powder machine is required to be meticulous and keep the equipment in good condition. The details are as follows: the sector block and bearing bush of the lower bearing seat should be aligned with the center line;

The connection between the inlet and outlet hoppers is well sealed. The temperature sensor is installed in the bearing bush, has been electrically debugged, and the sensor head is in good contact with the metal. Make sure that the monitoring equipment is connected well;

The oil pressure gauge, thermometer, accident button, and interlocking device have reliable indications. Prepare the necessary tools in advance: thermometer, vibration meter, listening stick, walkie-talkie, and test run record form.

If there is no abnormality, start the dolomite powder machine to run for 8 hours. During the trial operation, check the heat generation of the dolomite powder machine bearing seal, the lubricating oil temperature and pressure, and the temperature should be controlled between 40-50 °C. If there is any abnormality, stop cooling immediately.

The large gear and the pinion should be aligned according to the instructions. The sector block of the lower bearing seat, the bottom plate of the pinion, the bottom frame of the main gear and the bottom frame of the motor are completely grouted, and the grouting strength meets the design strength requirements.

All anchor bolts, connecting bolts and main gear pressing bolts should be tightened. The fixing bolts of the large gear should be tightened according to the specified torque. The bearing bush should be installed on the fan-shaped block of the bearing seat according to the rotation direction of the vertical roller mill;

The bearing bush should be corrected according to the axial guide ring;

The bearing seat seal is installed correctly, and the joint point is sealed with sealant. All lubricating points of the vertical roller mill are given sufficient amount according to the lubrication requirements;

The lubricating oil station, bearing, reducer and motor are well lit. Pipes and hoses are installed in the correct order and in accordance with the assembly instructions, and each pipe is not blocked;

The vertical roller mill is an indispensable equipment in the concentrator, and it is also a very critical equipment in the construction of the entire concentrator. Therefore, it is very important to ensure the stable operation of the vertical roller mill.

However, before it is officially put into operation, the debugging of the vertical roller mill is a very important step, and there can be no deviation at any point, otherwise the particle size of the vertical roller mill product will not meet the requirements, and even the metal recovery rate will be reduced. So how to debug the vertical roller mill? Let's see how vertical roller mill does in the debugging process.

The debugging of the vertical roller mill should confirm whether the debugging conditions are met, run empty and under load, and check the status of all aspects of the equipment.

Check whether the vertical roller mill meets the following debugging conditions. Whether the vertical roller mill equipment is fully installed according to the drawings, and ensure that all parts of the equipment are in the correct position.

• It is required to have a record of the complete installation process and to pass the acceptance inspection;
• The strength of the basic concrete of the equipment and the strength of the secondary grouting concrete must reach the strength level required by the design;
• The PLC control system, thermometer and pressure gauge of the vertical roller mill can be reliably put into operation;