Analysis of Causes of Powder Leakage in Calcium Carbonate Processing Machine
The reason why the Calcium Carbonate Processing Machine leaks powder is that the internal and external pressure difference must exist and the sealed gap of the Calcium Carbonate Processing Machine itself causes the pulverized coal or dust to leak. The analysis reasons are as follows:
1. The pressure difference between the sealed air and the primary air and the amount of air supplied
When the Calcium Carbonate Processing Machine is in operation, there is a pressure difference between the inside and the outside of the mill. In order to prevent leakage of coal powder and contaminate the oil chamber inside the grinding roller, the Calcium Carbonate Processing Machine is provided with a sealing air system. The main sealing points are grinding rollers and tie rods. Drive plate and other parts. The required values of the sealed air system are as follows: the pressure difference between the sealing wind and the primary air must be greater than 2 kPa at startup; the difference between the sealing air and the primary air during operation should not be less than 1.5 kPa; the sealing air pressure is less than the primary air pressure, causing a primary wind Entering the sealed chamber caused a dust leak in the wind.
2, sealing device
The Calcium Carbonate Processing Machine seal is worn, and the gap between the seals is too large, causing leakage of coal powder.
Seat seal: The seal between the drive plate and the base is mainly sealed by a carbon-sealed ring sealed by a spring. The carbon crystal seal ring is in direct contact with the drive plate. The rotation of the drive plate causes the carbon crystal seal ring to wear gradually. When the wear amount of the seal ring is too large, a gap occurs between the seal ring and the drive disc, which causes the seal wind to be exposed. At this time, the pressure of the seal chamber of the base is reduced, and the primary air enters the sealed chamber, causing dust leakage in the primary air.
Pull rod seal: During the working process, the action of the loading force and the grinding force of the grinding roller drives the movable ring to slide in the horizontal direction, resulting in wear of the sealing body. Long-term wear causes gaps between the movable ring and the fixed ring of the sealing body, and the sealing air leaks. When the air leakage is serious, the sealing air pressure in the rod sealing body is reduced, and the primary air enters the sealing body, causing dust leakage in the primary air.
The inlet door and the inspection door are sealed: the inlet door and the inspection door are sealed to the casing through the sealing plate, and the damage of the sealing packing is the main cause of leakage of coal powder.
Flange surface contact seal: sealed between the casing and the separator flange by an asbestos sealing rope. Damage to the seal rope is the main cause of leakage of coal powder.