1. Oil leakage from the box This is one of the most common faults of the ZQ reducer. Oil leakage from the box is usually caused by the following reasons: (1) Failure of the box joint surface seal: If the end covers or joint surfaces of the box are uneven, the bolts are loose, or the dirt on the joint surface is not completely removed during maintenance, or the sealant is improperly applied, it will cause lubricating oil to seep out from the gaps. (2) The blockage of the vent hole causes the internal pressure to increase: When the reducer is running, the gear friction and heat will increase the temperature inside the machine. If the ventilation hole (breathable cap) is unreasonably designed or blocked by dust or oil, the pressure inside the box will gradually increase, and the lubricating oil will be squeezed out from the gaps in the box under the action of the pressure difference. (3) Overfilling of lubricating oil: If the amount of lubricating oil exceeds the upper limit, the oil pool will be violently stirred during operation, and a large amount of lubricating oil will splash and accumulate on the shaft seal, joint surface, etc. of the box, which can easily cause leakage. (4) Box casting defects: The box is usually cast from gray cast iron or ductile iron. Read More

1. Rough installation techniques, illegal hammering and incorrect operations: When installing a coupling, directly use a hammer to hit the coupling or motor shaft hard. Undesirable consequences: This violent operation will seriously damage the keyway, and even cause damage to the internal gear structure of the reducer and break the output shaft. Correct approach: It is strictly prohibited to directly hammer the motor shaft end. The shaft end screw hole press-in method should be used (use bolts to press the transmission parts in), or the hot-fitting method should be used (the heating temperature is controlled at ≤135°C). 2. The centering and alignment accuracy is not up to standard or the method is improperly operated: installation is carried out based only on visual judgment or simple measurement with a ruler, without precise alignment; or only cold calibration is performed, ignoring the impact of thermal expansion after the equipment is in operation. Adverse consequences: Misalignment is the 'culprit' that causes equipment vibration and wear, abnormal noise in couplings, bearing heating and seal leakage. Correct approach: You must use a dial indicator (double-meter method) or a laser alignment instrument for precise alignment, and avoid 'visual alignment'. It is recommended to enter Read More

1. Preliminary judgment without dismantling the reducer during operation. Without dismantling the reducer, you can preliminarily judge whether the bearings and bearing seat holes have abnormal wear by observing the operating status of the equipment: 1. Listen to the sound: If there is abnormal metal friction sound, high-frequency 'squeaking' sound or 'buzzing' sound during operation, it may indicate that the bearing is short of oil or has been worn. 2. Measure temperature and vibration: Use instruments to detect vibration and temperature. If the vibration temperature rises abnormally, or the temperature at the bearing seat hole and journal is too high after shutdown, it indicates that there may be increased friction caused by wear. 3. Check the oil pressure and displacement: Observe whether the oil pressure of the equipment increases significantly and whether the axial displacement increases. These are signs of bearing damage or wear. 2. Precision inspection of appearance and size after disassembly. When the equipment is shut down and disassembled, strict physical inspection of the bearing seat hole is required: 1. Appearance inspection: Clean the oil stains and impurities on the surface of the hole, and carefully observe whether there are any traces in the bearing contact area. Read More

1. Foundation fixing and leveling issues 1. The foundation is not strong or uneven: The reducer must be installed on a flat, solid foundation or frame with sufficient stiffness. An unstable foundation will cause vibration and abnormal noise when the equipment is running, and accelerate the wear of bearings and gears. 2. Insufficient leveling accuracy: A high-precision level must be used for leveling on the input/output shaft flange surface or datum surface during installation. The level error should usually be controlled within 0.1mm/m. Inclined installation will aggravate the eccentric load wear of gears. 3. Improper tightening of anchor bolts: they must be tightened gradually to the specified torque in 2-3 times in a diagonal sequence. Tightening at one time or in the wrong sequence will cause the box to be deformed due to uneven stress, causing oil leakage or damage to internal parts. 2. Axis alignment problems 1. Excessive concentricity deviation: This is one of the most common installation problems. If the concentricity deviation between the motor shaft and the reducer input shaft, the reducer output shaft and the working machine shaft exceeds 0.1mm Read More

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1. First look at the transmission ratio, which is the core of Selection. Different types of flour grinding machines have different speed requirements. Small household flour grinding machines are suitable for low-speed and high-torque reducers to ensure fine grinding without jamming; commercial large-scale flour grinding machines need to be adapted to high transmission efficiency reducers, taking into account both speed and power, to avoid slow discharge and insufficient production capacity. The transmission ratio does not match, either the speed is too high and the flour is too coarse, or the torque is insufficient and the machine is frequently bored. 2. Secondly, look at the model adaptation. Surface grinding machine reducers are divided into three mainstream types: cylindrical gears, worm gears, and planetary gears. Worm gear reducers are low-priced and quiet, and are suitable for small household flour grinding equipment. They are sufficient for daily grinding of wheat and corn; cylindrical gear reducers have strong load-bearing capacity, are wear-resistant and anti-fabricating, and are suitable for commercial flour grinding machines that work continuously for a long time; planetary reducers have high precision and stable transmission, and are mostly used in fine grain grinding equipment. 3. Finally, look at the material and workmanship. Give priority to reducers with cast iron bodies and alloy gears. Read More