What are the reasons for abnormal lubricating oil consumption in ball mills?

1. Failure of sealing system
Seal is the key to preventing lubricating oil leakage. Damage to sealing components or improper installation are common causes of abnormal consumption:
1. Damage to oil seal/seal ring
Aging of the skeleton oil seals of the input shaft and output shaft of the reducer (such as rubber hardening, lip wear), or scratches on the lips and springs falling off during assembly, resulting in lubricating oil leakage along the journal;
The sealing gaskets (such as asbestos pads, rubber pads) on the joint surfaces of the bearing end cover and the housing are damaged, aged, or the fastening bolts are loose, causing oil leakage on the joint surface.
2. Design defects of sealing structure
For inclined reducers (such as edge-driven ball mills), if the shaft end seal does not adopt a backflow prevention structure, the lubricating oil is prone to leakage due to gravity;
The gap of the labyrinth seal is too large (more than 0.15mm), or the position of the oil thrower is offset, which cannot effectively prevent the lubricating oil from overflowing.
2. Abnormal lubrication system
Failures in the oil supply and return links of the lubrication system may lead to waste or abnormal loss of lubricating oil:
1. Excessive oil supply or high pressure
Improper flow adjustment of the lubricating pump (such as excessive speed of the gear pump), or forced increase of pressure after the nozzle is blocked, resulting in the lubricating oil overflowing without sufficient lubrication;
The return oil pipeline is blocked (such as filter blockage, pipeline bending), and the oil cannot flow back to the oil tank in time, and overflows from the vent hole or sealing gap.
2. Emulsification or contamination of oil
The cooling system leaks (such as the copper tube of the cooler breaks), or the environmental humidity is high (the ball mill is often in a humid environment), causing the lubricating oil to emulsify and deteriorate, and frequent replacement is required;
Dust and metal debris mixed into the oil (such as iron chips produced by gear wear), accelerating the deterioration of the oil, forcing early oil change.
3. Wear or misalignment of mechanical parts
The mechanical stress during ball mill operation may cause abnormal wear of parts, indirectly increasing lubricant consumption:
1. Excessive wear of gears or bearings
Poor gear meshing (such as tooth surface wear, broken teeth), or excessive bearing clearance (more than 0.2mm), high temperature is generated during operation, accelerating the oxidation and deterioration of lubricating oil;
The bearing retainer is damaged, and the friction between the roller and the inner and outer rings is aggravated, causing the lubricating oil to fail due to high temperature carbonization and requires frequent replenishment.
2. Equipment installation or centering deviation
The centering deviation of the motor, reducer, and ball mill cylinder axis is too large (radial > 0.2mm, axial > 1mm/m), resulting in uneven force when the gears are meshing, generating additional friction heat, and accelerating oil consumption;
The reducer base is loose or deformed, the housing vibrates violently during operation, and the lubricating oil is shaken out from the gap of the joint surface.
4. Improper operation and maintenance
Human factors may also cause abnormal lubricant consumption:
1. Improper control of refueling volume
Failure to refuel according to the oil level gauge standard (such as exceeding the highest oil level line), the oil splashes due to stirring during operation, and overflows from the vent or seal;
Mistakenly adding different types of lubricants when refilling (such as viscosity mismatch), resulting in reduced oil performance and frequent replacement.
2. Unreasonable maintenance cycle
Failure to regularly clean the oil tank and filter (such as not cleaning every 3 months), resulting in impurities accumulating and blocking the oil circuit, forcing the lubricant to leak from the weak point;
The oil seal and gasket status have not been checked for a long time (such as no inspection for more than 6 months), and the seals have not been replaced in time after aging, resulting in continuous oil leakage.