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(A) The contactors in use in the stent by repeated heavy blow, if the material is poor or poor manufacturing, easy to break the stent; In addition, the shaft hole with too loose, the hole to be collision, the stent is also easy to damage, therefore, asked the contactor shaft Hole to slide with, do not be too loose or too tight. If the shaft is worn, it should be promptly replaced, otherwise the bracket will be damaged. (B) bracket tie column can not work. The reason is: 1. Shaft hole with too tight. 2. After frequent operation, the shaft is removed from one end. 3. The two ends of the shaft are not machined into rounded corners, and deep grooves are ground on the base and rolled. Emergency solution is to push the shaft back to its original position, the contactor can work, but after using for a period of time, there will be this problem, it is best to change a pin. If it is because the pedestal is ground out of the deep groove and the stent is rolled, the pedestal can be filled with epoxy resin filled deep groove, and the contactor can work. (C) the core wear Extreme deformation is a contactor ubiquitous problems, iron core surface after long-term frequent collisions, outward expansion along the lamina thickness direction, and the uneven surface of the touch, resulting in core into a noisy , But also because of larger remanence and stick the armature. Deformation of the pole surface is due to the tightness of the iron core or insufficient material strength. In addition, the contactor impact kinetic energy is also a reason. In order to eliminate the latter problem, the iron core suction force and reaction force should be properly adjusted. In emergency repair, in order to prevent iron core sticking, often in the column air gap pad 0.05 mm thick cable, if such noise is too large, the center column iron core file down to 0.1 mm, make it With a certain air gap, you can also use more iron core approach. (D) short circuit turn or break out. Short-circuit turns often occur at the corner of the groove or near the notch. Repair can be welded at the broken place, with epoxy resin at both ends fixed. After the short circuit turns out, it should be re-pressed or re-do a change, but also in the tank with a steel bar will be shaved groove wall, and then use a flat drill into the groove. (E) Contactor noise in use is a common fault. The main reason is the iron core and the armature contact with the polar surface of grease or dust generated an unwanted air gap, the core jitter and temperature rise. In addition, the lower and upper core support shaft hole concentricity is not good, the polar surface can not be in close contact will produce noise. The solution: the timely elimination of the central columnar armature and the end of the grease, which can be scrubbed with gasoline or banana water, you can get rid of; the other appropriate adjustment screw adjustment to ensure the concentricity of the shaft hole; and, for example, CJ12 series Contactor, because the magnetic system deflection deflection also produce noise, can strengthen the buffer spring force to eliminate. The power network voltage is too low, the contactor core suction decreases, the contactor will have noise. (F) CJ12 series of moving contact is a nut lock, if not locked, action by the role of centrifugal force may make the contact prolapse. If the nut contact embossed wear out will cause the contact prolapse, then the contact can be marked with a number of red-eye, to prevent the prolapse. If you encounter a flat contact surface or static and dynamic contact non-parallelism is too large, static and dynamic contact can not be all contact, then you need to re-assembly adjustment. (G) CJ12 series contactors under the core pin and sparks between the stent, because the floor, under the iron core, bracket, pin formed between the vortex loop. This "loop" is caused by the damage of the insulation board between the lower iron core support and the floor. Re-insulation damage can eliminate sparks.