K series (usually K series spiral bevel gear) reducers frequently experience overload tripping during operation, which indeed greatly affects the production schedule. This is usually caused by three main categories of reasons: abnormal mechanical load, improper electrical protection settings, or failure of the equipment itself.
You can troubleshoot and process in the following order, from simple to complex:
1. Electrical system inspection (priority inspection)
In many cases, tripping is not caused by a broken reducer, but because the protection mechanism is too sensitive or there is a problem with the power supply.
1. Check the setting value of the thermal relay or circuit breaker: Check the rated current of the motor and confirm whether the setting current of the thermal relay or circuit breaker is too small. If the set value is lower than the rated current required for actual operation of the motor, a slight load fluctuation will cause it to trip.
2. Check voltage stability: measure whether the input voltage is stable. Too low voltage will cause the motor current to increase to maintain power, thus causing overload; voltage phase loss (one phase of three phases is missing) will also cause a sharp increase in current and rapid tripping.
3. Check the motor insulation: Use a megger (megger) to measure the insulation resistance of the motor winding to rule out excessive current caused by internal short circuit or moisture in the motor.
2. Mechanical load and installation troubleshooting (the most common reasons)
If the electrical parameters are normal, the problem usually lies in excessive mechanical resistance.
1. Check the lubricating oil (very critical):
Oil level and oil quality: K series reducers have higher lubrication requirements. Check whether the oil level is too low, causing dry grinding of the gear, or whether the lubricating oil has not been changed for a long time, has deteriorated, or is mixed with impurities, resulting in an increase in viscosity and a sharp increase in operating resistance.
Oil model: Confirm whether the lubricating oil specified by the manufacturer is used (such as 220# medium load industrial gear oil).
2. Check the coupling and alignment:
If a coupling is used to connect the reducer and the motor, or the reducer and the working machine, check whether the coaxiality deviation is too large. Severe misalignment can produce huge radial forces, causing bearings to seize or be overloaded.
Check whether the coupling elastomer (plum blossom pad, nylon pin, etc.) is worn or damaged, resulting in poor transmission.
3. Check the back-end working machine:
Sometimes the problem is not the reducer, but the equipment driven by the reducer (such as mixers, conveyors, etc.). Check whether the working machine has any jammed materials, damaged bearings, excessively tight chains or stuck foreign objects. You can try to disconnect the reducer from the working machine and run the reducer without load to see if it still trips.
3. Internal troubleshooting of the reducer (professional disassembly required)
If the current is still too high or trips under no-load operation, there may be a serious fault inside the reducer.
1. Bearing damage: There are multiple sets of tapered roller bearings inside the K series reducer. If the bearing cage is chipped, the balls are worn, or the inner ring is runaway, great mechanical resistance will occur. Listen to see if there is any abnormal 'buzzing' sound or metal friction sound when the reducer is running.
2. Gear wear or broken teeth: Check the gear tooth surface for severe pitting, gluing or even broken teeth. Damaged gear fragments stuck in the mesh area can cause instantaneous overloading.
3. The breather cap is blocked: Check whether the breather cap (respirator) on the top of the reducer is blocked by paint or dust. If the breathable cap is clogged, the internal air pressure will increase after the reducer runs and generates heat, which will cause the oil seal to leak and increase the stirring resistance (although this situation will result in less tripping, it will aggravate the heat generation).
