What are the common faults of electric valve actuators?
Electric valve actuators are generally composed of two parts: electronic control part and power part, so the common faults in electric valve actuators can be divided into control part faults and power part faults. Below we will introduce the common faults of the power part and their cause analysis and troubleshooting measures in detail. The power of the electric valve actuator is generally provided by the motor, so it is necessary to master some knowledge of the motor. In this way, we can find and eliminate the hidden dangers of electric motors on electric actuators as soon as possible, and ensure the safe operation of electric actuators and electric valves.
mechanical failure
1. Motor sweep: The gap between the stator and rotor of the motor is very small, which is easy to cause collision between the stator and the rotor. Once the machine base, end cover and rotor have different axes, it will cause the stator and rotor to collide, which is often referred to as sweeping. The common factors that cause the phenomenon of different axes are: the motor bearing is seriously out of tolerance, the inner hole of the end cover is worn, and the stop hole of the end cover and the stop hole of the base are worn and deformed. If these phenomena are found, the bearing should be replaced, or the end cover should be replaced or brushed.
2. Motor vibration: The vibration should first be distinguished from the motor itself, or caused by the poor transmission device, or transmitted from the mechanical load side, and then eliminated according to the specific situation. The vibration caused by the motor itself is mostly caused by poor dynamic balance of the rotor, poor bearing, bending of the rotating shaft, or different axial centers of the end cover, machine base and rotor, or the motor installation foundation is uneven, the installation is not in place, and the fasteners are loose. of. Vibration creates noise and additional loads.
3. The bearing is not working properly: If the bearing is not working properly, it can be judged by hearing and temperature based on experience. Touch the bearing box with a listening rod (copper rod). If you hear an impact sound, it means that one or several balls may be crushed. If you hear a hissing sound, it means that the bearing oil is insufficient. It is not easy to add too much grease. If it is too much, it will cause a lot of friction between the rotating part of the bearing and the grease and generate heat. Generally, the grease placed in the bearing box is about one-half to one-third of the total dissolved volume. The second can be. If the bearing is installed incorrectly and the fit tolerance is too tight or too loose, it will also cause the bearing to heat up.