Time : 2019-09-20 Browse : 9
During the operation of the magnetic coupling, various faults may occur due to factors such as structural design, installation and maintenance, and operating conditions. The details are as follows:
I. Shaft system related faults Shaft bending and deformation
The power output shaft is a cantilever structure and is supported by a radial thrust bearing. If the bearing is not adjusted or replaced in time after wear, the bearing clearance and the bevel gear clearance will increase, destroying the normal meshing of the bevel gear, causing additional loads, worsening the bearing condition and bending the shaft. In addition, the assembly structure of the bevel gear shaft and the permanent magnetic coupling of the conveyor reducer is unreasonable and heavy, and it is easy to collide and deform during installation and transportation; when running at high speed, the permanent magnetic coupling that has only been subjected to static balance tests is unbalanced, generating additional loads and shaft vibration, which can also cause shaft bending. Spline deformation: When the permanent magnetic coupling is started, the force and stress conditions of the shaft deteriorate, which may cause spline deformation and affect the stability of power transmission.
II. Motor burnout
Even after using permanent magnet couplers, motor burnout accidents may still occur. The main reasons include:
Insufficient understanding of equipment performance or improper use, such as not draining the oil when running under i=0 conditions, resulting in long-term overload and burnout of the motor.
The power supply line is too long, resulting in excessive voltage drop in the power grid, causing the motor to run for a long time at a lower voltage, increasing the rated current, and causing overheating and burning.
III. Oil leakage failure
Poor sealing performance is the main cause of oil leakage. When the permanent magnet coupler is overloaded, the oil temperature and pressure rise sharply, which will accelerate the aging of the rubber seal ring, resulting in a decrease in sealing performance and oil leakage. Oil leakage will reduce the torque transmitted by the coupler and cause difficulty in starting.
IV. Other related failures
If the working machine load is suddenly overloaded, and the torque limiter or coupling is not installed on the output shaft end in time, it may aggravate the damage to the shaft system and related components. In addition, the rationality of the assembly of permanent magnet couplers and reducers and other components will also indirectly affect the overall operating status of the equipment and increase the probability of failure.
For the above faults, it is necessary to strengthen the clearance adjustment during installation, regularly maintain bearings and seals, reasonably match protective devices, and standardize operation to reduce the occurrence rate of faults.
