1、 Loose and cracked contacts areFinder relayFor electrical contact parts that complete load switching, the contacts of some products are riveted and pressed. The main disadvantages are loose contacts, cracked contacts or excessive size and position deviation. This will affect the contact reliability of the finder relay. The loosening of the disassembly point is caused by the unreasonable size of the fitting part between the reed and the contact or the improper adjustment of the riveting pressure by the operator. Contact cracking is caused by excessive hardness or pressure of the material. For contacts made of different materials, different material processes should be used. Some contact materials with high hardness should be annealed, and then the contacts should be manufactured, riveted or spot welded. The contact should be carefully manufactured, because there is a tolerance in the material, so the cutting length should be determined after each mold test. There should be no flash, pad damage and plumpness during contact manufacturing. The contact riveting deviation is caused by the operator's incorrect mold and the dislocation of the upper and lower molds. Contact damage and contamination are caused by oil contamination and iron filings on unclean molds. No matter what kind of defect, it will affect the reliability of finder relay. Therefore, in the process of contact manufacturing, riveting or welding, the self inspection regulations of intermediate sampling and final inspection in the first article inspection should be observed to improve the assembly quality.
2、 There are many kinds of coils of the coil fault finder relay. Whether it is outsourced or not, the coils should be placed separately in the appliance. If they collide and cross, they will be broken during separation. When riveting the electromagnetic system, the pressure adjustment of the hand wrench press and the press should be moderate. If the pressure is too high, the coil will break or the spool will crack and deform, and the winding will be damaged. If the pressure is too small, the winding will loosen and the magnetic loss will increase. Multi winding coils are usually headed by leads of different colors. When welding, pay attention to distinguish, otherwise it will cause wrong welding of the coil. Coils with start and end requirements are generally marked by marking. Attention should be paid to assembly and welding, otherwise the finder relay will have reverse order.
3、 The glass insulator is damaged. The glass insulator is made of metal pins and glass sintering. During the inspection, assembly, adjustment, transportation and cleaning process, the pins are easy to bend, the glass insulator falls off and cracks, resulting in the decline of insulation performance and withstand voltage performance in case of air leakage. The rotation of the pins will also cause the displacement of the contact reed, affecting the reliable on-off of the product. This requires the assembly operator to handle the finder relay carefully in the whole production process, and the parts should be neatly arranged in the transmission box. During assembly or adjustment, it is not allowed to pull or twist the lead out foot.
4、 The riveted parts of the electromagnetic system are deformed. After riveting, the parts are bent, skewed, thick and black, which brings difficulties to the assembly or adjustment of the next process, and even causes scrap. The main reasons for this problem are that the riveted parts are too long or too short, or uneven stress during riveting, mold assembly deviation or design size error, and parts are placed improperly. When riveting, the operator should first check whether the size, shape and mold of the parts are accurate. If the mold is not installed in place, it will affect the assembly quality of the electromagnetic system or the deformation and thickness of the iron core.