Common failures of couplings

　　1. Broken shaft
　　(1) The power output shaft of the coupling is cantilevered and adopts radial thrust bearings.When installing this kind of support structure, the bearing clearance and bevel gear clearance should be adjusted to ensure correct meshing.After the bearing is worn, adjust and replace it in time.Otherwise, once the gap becomes larger, the normal meshing of the bevel gear will be destroyed, causing additional load, resulting in deterioration of the bearing working condition, gear teeth, crappy bends, or even breakage;
　　(2) The bevel gear shaft of the conveyor reducer is installed with the coupling, the structure is unreasonable, the weight is large, and it is easy to collide during installation and handling, which may cause the shaft to bend and deform;
　　(3) When leaving the factory, the coupling is only tested for static balance. During high-speed operation, the additional load and shaft vibration caused by unbalance will deteriorate the working state of the shaft;
　　(4) When the coupling is started, the force and stress condition of the shaft deteriorates, resulting in the deformation of the spline.
　　2. Burn the motor
　　(1) After the coupling is adopted, there will still be motor burning accidents, which are mainly caused by the lack of understanding of the performance of the equipment and incorrect use; the characteristics of the coupling determine the operating conditions of the motor, at i=0 When running under high working conditions, drain the oil in the coupling to prevent the motor from being burnt due to long-term overload;
　　(2) Due to the excessively long power supply line and other reasons, when the voltage drop of the power grid is too large, the characteristic curve of the motor will change. If the motor runs for a long time at a lower voltage, its rated current will increase, which will cause the motor to overheat and burn.
　　3. Oil leakage
　　Oil leakage is caused by poor sealing performance. When the coupling is overloaded, the oil temperature and pressure increase sharply, the rubber sealing ring rapidly ages, the sealing performance deteriorates, and the oil leakage reduces the transmission torque, causing difficulty in starting.