Increase Vertical Roller Mill Production

Vertical Roller Mill

Introduction

Production of vertical roller mill is getting lower and lower? Look for these reasons, increase production and make more money. Vertical grinding is a kind of grinding equipment that integrates drying, grinding, powder selection and transportation. It's popular because it's small. However, many people report that after a period of use, the output is not as good as before, which directly affects the economic benefits. Let's look at the factors that affect current factory production and how to prevent its reduction.

Roller and disc bushing wear

When the vertical roller mill works, the grinding pressure is applied through the grinding roller, and the material is squeezed and sheared by the grinding roller and grinding plate to achieve the purpose of grinding material. Therefore, it is inevitable that the roller surface and the grinding plate surface liner wear. With the extension of grinding time, the abrasion of the liner will be more serious, the gap between the grinding roller and the grinding disk will become larger or the shape is not uniform, and the grinding efficiency will be greatly reduced, leading to a sharp decline in the output of vertical roller mill.

In this case, the lining wear should be checked regularly. When the grinding roller and the lining wear to a certain extent, it must be replaced in time to avoid the lining wear caused by vibration or other problems, affecting the vertical roller mill operation. Lining wear must be checked and treated promptly. The life of the lining can be extended by changing the lining surface and lowering the height of the fixing ring.

Wear Ring

The function of the abrasive ring is to enable the material to be completely ground on the abrasive disc. The material ring suffers wear or section, which will inevitably reduce the thickness of the material layer. The vibration of the mill will increase. Coarse powder is not completely ground and is thrown out of the disc by centrifugal force, increasing the amount of material returned to the mill. The volume also increases, which can only reduce the output of the vertical roller mill, and vibration is also very large, easy to jump and affect the operation of the mill. Therefore, please check the fixing ring regularly to find out the problem and deal with it in time.

Nozzle ring wear

The main function of the nozzle ring is to change the direction of the wind passing through the guide blade to ensure that the airflow rotates upward to take away the material. If the nozzle ring is worn or partially worn, the airflow becomes chaotic and does not form a steady spiral-upward airflow, and the wind speed is reduced. The material cannot be taken away and returned to the grinding disc or scraper cavity at the bottom of the nozzle ring in time to increase circulation. Affects rolling mill production.

Milling material properties

  1. 1. The hardness of the material entering the grinding machine, such as the poor grinding performance of high silicon materials. In order to meet the qualified raw materials, it is inevitable to extend the grinding time of the material and increase the grinding cycle.
  2. 2. If the particle size of the material is too large, the grinding frequency will increase, the circulation quantity will increase, the pressure difference will be large, and it will be difficult to grind. It can also cause large vibrations and unbalanced operations.

Therefore, the operation of the mill is controlled according to the actual raw material situation of each manufacturer, the grindability and granularity of the material, so as not to affect the output.

System air leakage

The air leakage of the mill inevitably leads to small pressure difference, insufficient wind speed, the powder can not be taken away in time, affecting the output of the mill. In addition, leaks can occur in other parts of the system, reducing the wind speed and causing piping to accumulate. After the pipe accumulates, the ventilation area will become smaller, and insufficient air will affect the output of the mill. Therefore, it is necessary to check the air leakage of the system in time.

Layer thickness

After feeding the material to the grinding wheel, a certain material layer is formed. When the thickness of the material layer reaches a certain thickness, the grinding roller begins to grind. If the material layer is too thin, the grinding stress is too concentrated and the grinding capacity is reduced, which will inevitably lead to the impact of roller lining and disk lining. The mill vibrates a lot and jumps easily. It can also damage the lining board, pull rod and so on. Thin layer control cannot be performed.

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