How to Reduce the Occurrence of Noise in Cement Ball Mills?

The high-yield and high-efficiency cement ball mill is mainly used in the open-flow grinding system. Its features are simple system equipment and process flow, low investment, and less floor space; the special internal powder selection device is used in the structure of the mill, the fine grinding chamber has an activation device, and the tail of the mill has a dedicated discharge scraper, which greatly reduces the size of the grinding medium in the grinding chamber, and greatly improves the grinding efficiency, achieving the goal of high yield and low energy consumption. Noise pollution from cement ball mills is a major problem that affects efficiency. This is because the equipment noise not only damages workers' and maintenance personnel's health but also destroys the environment. Therefore, we need to understand the noise source of the mill to solve it.

Noise sources of cement ball mills

• Noise generated by cylinders: When the cylinder rotates, the mechanical noise caused by the collision between steel balls and steel balls, and steel balls and steel cylinders can cause mechanical noise, and the noise level radiated outward through the cylinder can reach 115 dBA. Above, the noise band is wider.

• Noise generated by motors and transmission machinery: The electromagnetic noise generated by the operation of the motor, the airflow noise generated by the fan, etc. The motor noise is proportional to the motor power and speed, and the mechanical noise of the gearbox is mainly caused by the collision between gears and the mutual friction between components.
  

Noise control methods for cement ball mills

• Damping sound insulation layer: Wrap the ball shell of the cement ball mill with a layer of sound insulation material to reduce the noise of the cylinder. This method usually reduces the effect, and the effect is not ideal.

• Sound insulation cover: Used to enclose the drum part of the cement ball mill, block the path of noise transmission, and thus reduce the radiation noise of the drum. However, the installation of sound insulation covers makes repair and operation difficult. At the same time, since the motor and transmission machinery are enclosed in the sound insulation cover, it is difficult to ventilate the device, and heat dissipation is difficult, and maintenance work is not convenient.
  

• Use manganese steel liner instead of rubber liner. The original manganese steel lining is replaced with a rubber lining. The impact noise between steel ball mill and cylinders can be greatly reduced. The effect is obvious, but there is still a problem with the service life of the rubber lining.
  

The cement mill is a horizontal cylindrical rotating device, with outer gear transmission, two bins, and a grid-type ball mill. The material enters the mill uniformly through the feed device and the hollow shaft spiral, and the mill's compartment contains a stepped liner or a corrugated liner, and is filled with steel balls of different specifications. When the cylinder rotates, the centrifugal force brings the steel balls to a certain height and falls, producing a heavy impact and grinding effect on the material. After the material is roughly ground in the cement ball mill, it enters the second bin through the single-layer compartment board, and the second bin has a flat liner and is filled with steel balls to further grind the material. Powder is discharged through the discharge grate board to complete the grinding operation.

Because noise pollution from cement ball mills is a major problem that affects manufacturers and users, it poses a serious threat to the health of operators and maintenance personnel. Therefore, it is necessary to solve it according to requirements to ensure the use of equipment. Cement ball mills are widely used in the production of cement, silicate products, new building materials, refractory materials, fertilizers, black and non-ferrous metal beneficiation, and glass ceramics industries, and dry or wet grinding various ores and other grindable materials.

Reference

Ball Mill, Working Principle, Types, Parts, Applications and Advantages