What are the solutions to ball mill reducer failure?

1. Solution to reducer oil leakage
1. Aging/wear of seals
Replace failed oil seals, O-rings or gaskets (use the same type of seals as the original factory to ensure that the material is oil-resistant and high-temperature resistant);
Apply sealant (such as silicone rubber sealant) evenly on the joint surface during installation to avoid deformation of the seal caused by excessive tightening of the bolts.
2. Loose bolts on the joint surface of the box
Tighten the bolts evenly according to the specified torque (refer to the equipment manual), and the diagonal step-by-step tightening method can be used;
If the bolt hole is threaded, it is necessary to expand the hole and tap and replace the thickened bolts, or weld the nuts for repair.
3. The oil level is too high or the oil quality is problematic
Drain excess lubricating oil to the standard oil level (observed by the oil level gauge);
If the pressure is abnormal due to oil emulsification (water ingress) or excessive impurities, it is necessary to completely replace the new oil and clean the oil tank.
4. Shell cracks
Minor cracks can be repaired by epoxy resin bonding or welding (cast iron shells need to be preheated to prevent brittle cracking);
Severe cracks require replacement of the reducer housing (rare cases, mostly due to equipment aging or severe impact).
2. Solutions to abnormal noise/vibration faults of reducers
1. Poor gear meshing
Tooth surface wear/pitting: If the wear is slight, it can be repaired by grinding the tooth surface; if it is serious, the gears need to be replaced (replace in pairs to ensure meshing accuracy);
Installation deviation: Recalibrate the parallelism of the gear axis (large and small gears of edge transmission) and the center distance, and tighten the bearing seat after adjustment;
Insufficient lubrication: Check the pressure of the lubricating oil pump, clear the oil blockage, ensure that the gear meshing area is fully sprayed with oil, and replace the new oil according to the model (such as medium-load industrial gear oil).
2. Bearing damage
Disassemble the reducer and replace the damaged bearing (select high-precision bearings of the same model, such as spherical roller bearings);
Ensure that the bearing clearance meets the standard during installation (overtightening will cause overheating, and over-loosening will cause vibration), and apply special grease.
3. Internal foreign matter
Drain the oil after shutdown, and thoroughly clean the oil tank, filter and gearbox;
Check the source of foreign matter (such as gear fragments, bearing debris), check whether the related components are damaged, and avoid secondary failures.
III. Solution to the high oil temperature of the reducer
1. Lubricating oil problem
Check the oil level and add it to the standard scale;
If the oil is deteriorating (blackened, with impurities), completely replace the lubricating oil (select oil with appropriate viscosity according to the equipment manual, such as high viscosity oil in summer);
Regularly (every 3-6 months) replace the lubricating oil and filter to avoid sludge blocking the oil circuit.
2. Cooling system failure
Clean the dust and oil on the surface of the heat sink to ensure smooth ventilation;
Check the cooling fan (motor, blades), repair or replace damaged parts;
In high temperature environments, a cooler (such as water cooling or air cooling device) can be installed to reduce the oil temperature to the rated range (usually ≤60℃).
3. Increased friction
If friction heating is caused by excessive wear of gears or bearings, the worn parts need to be replaced in time;
Adjust the load to avoid long-term overload operation of the reducer (such as controlling the feed rate to prevent the barrel from jamming).
IV. Failure of the output shaft/input shaft of the reducer (such as journal wear and bending)
1. Journal wear
Minor wear can be repaired by brush plating or spraying (restoring the journal size);
For severe wear, replace the new shaft (the matching accuracy with the gear must be ensured).
2. Shaft bending
For shafts with small bending, cold or hot straightening can be performed by a straightening machine (pressing and correcting after heating);
When the bending is severe, a new shaft must be replaced to avoid vibration and bearing wear caused by eccentric rotation.
5. The anchor bolts of the reducer are loose or broken
1. The broken bolts need to be replaced with high-strength bolts (such as 8.8 or above) and tightened according to the specified torque;
2. If the anchor bolt holes are loose, epoxy resin mortar can be poured to reinforce the base, or the bolt holes can be enlarged and replaced with thickened bolts;
3. Install anti-loosening gaskets (such as disc springs, stop gaskets) to prevent loosening again during operation.
6. Preventive measures (reducing reducer failures)
1. Regular lubrication and maintenance
Check the oil level and oil quality of the lubricating oil according to the periodicity, take samples for inspection regularly (such as monthly), and replace the deteriorated oil in time;
Ensure that the lubrication system (oil pump, oil pipe, oil nozzle) is unobstructed, and the gear meshing area and bearing cavity are fully lubricated.
2. Installation and alignment
After the new machine is installed or overhauled, strictly calibrate the axis alignment of the motor, reducer, and barrel (or pinion shaft) (radial deviation ≤0.1mm, axial deviation ≤0.5mm/m);
Gear meshing needs to check the contact spots (along the tooth height ≥40%, along the tooth length ≥50%), and fine-tune by adjusting the bearing seat gasket.
3. Load monitoring
Avoid instantaneous overload (such as sudden excessive feed volume, material stuck too hard), and install overload protection devices (such as current relays);
Regularly clean foreign objects (such as metal blocks) in the barrel to prevent impact loads from damaging the gears.
4. Status monitoring
Use an infrared thermometer to detect the reducer housing temperature during daily operation (stop and check if it exceeds 70℃);
Use a vibration detector to monitor the vibration value (such as the effective value of the speed ≤6.3mm/s), and check in time if abnormal;
Periodically (every six months) perform oil sample analysis to detect the metal particle content (to determine the degree of wear).