Explosion -proof electric gourd frequently occurs during use, and controls the turbulence, loosening (opening or short circuit) in the control box; then it is found that the main contacts of the main contactor are often burned. It was burned for less than a week; and directly led to the burning of the rolling motor. In addition, the main contactor and the intermediate relay as a transitional role have a jitter jump, and the motor starts frequently. The analysis of the specific reasons is as follows:

Control box internal wire failure: After on -site observation, explosion -proof electric gourds will be affected by many aspects during use. The shock of the collision of the fighting and acetylene generator protection circle during the feeding; the vibration generated during the start and lifting motor of the motor; The vibration produced during the combination and release. The vibration from all aspects of the electric gourd is an external cause that causes faults such as loosening and disconnecting the internal wires of the control box, and the defects of fasteners in design, processing and installation are their internal reasons.

The contactor and intermediate relay jitter jumping: Considering the impact of electric stones on the human body, there are two ways to add on -site and long -distance remote control. The long -distance remote control operation is to use the cross switches on the console to perform the electrone addition operation through the TV monitor in the central control room.

Solution: To reduce the pressure drop on the line, the direct method is to shorten the length of the control cable. After the actual application, the main contacts caused by the jump of the contactor were reduced.