[Relay protection relay common problems and treatment measures]: First, contact loosening back cracking contact is the electrical contact parts of the relay to complete load switching. Some products'contacts are matched by riveting and pressing. Its main drawbacks are loose contact, contact cracking or large deviation of size and position. This will affect the contact reliability of the relay. The spring and touch are loosened.

I. Re-cracking of loose contacts

Contacts are electrical contact parts for relays to switch loads. Some products'contacts are matched by riveting and pressing. The main drawbacks are loose contacts, cracking contacts or large deviations in size and position. This will affect the contact reliability of the relay. The loosening of the springs and contacts is due to the unfair size of the matching Department of the reeds and contacts or the improper adjustment of riveting pressure by the operator. Contact cracking is caused by excessive hardening or excessive pressure. The contact materials of different materials are processed by different materials. Some contact materials with higher hardness should be annealed and manufactured, riveted or spot welded. Contacts should be manufactured carefully, because there are tolerances in the material, so the length of each block should be determined after touching the test. Contacts should not be manufactured with pan-take-off edge, cushion damage and underfullness. The contact riveting deviation is caused by the manipulator's inaccurate touch and misalignment of the upper and lower touch. Contact damage and contamination are caused by oil contamination and iron scraps on the untreated tool. Whatever the disadvantages, the reliability of the relay will be affected. Therefore, in the process of contact manufacturing, riveting or welding, it is necessary to abide by the self-checking delimitation of intermediate sampling and final inspection of the first piece inspection in order to improve the assembly quality.

2. Relay parameters are not disorderly

The matching part of electromagnetic relay is riveted and assembled. The main problem is that the riveting position is loose or the bonding strength is poor. This kind of fault can make the relay parameters not disorderly, the parameters change greatly at high and low temperatures, and the mechanical vibration resistance and shock resistance are poor. The main causes of this defect are OVER-TOLERANCE of riveted parts, improper placement of parts, different quality of tools or incorrect installation. Therefore, before riveting, it is necessary to carefully inspect whether the worker's tools and riveted parts meet the requirements.

3. Deformation of Riveting Parts in Electromagnetic System

After riveting, the bending, twisting and thick black piers of the parts cause difficulties in the assembly or adjustment of the next process, and even lead to scrap. The main reasons for this defect are that the riveted parts are too long, too short or the riveting force is uneven, the assembly deviation of the die or the design size is wrong, and the parts are improperly placed. When riveting, the operator should first check the size and shape of the parts, and whether the tool is correct. If the tool is not installed in place, it will affect the assembly quality of the electromagnetic system, core deformation and pier thickness.

IV. Damage of Glass Insulator

Glass insulator is made of sintered metal pins and glass. It is easy to bend the pins when inspecting, assembling, adjusting, transporting and cleaning. Glass insulators fall off and crack, which results in air leakage and decreases the insulation and voltage withstanding function. The rolling of the pins will also cause the displacement of contact reeds and affect the reliable breaking of products. This requires the assembly operator to handle the relay lightly throughout the production process, parts should be neatly arranged in the transfer box, assembly or adjustment, do not allow to pull or twist the lead foot.

V. Coil Fault

There are many kinds of coils used in relays, either outsourced or not. The coils should be separated and placed in special appliances. If the coils are collided and connected, they will be broken when they are separated. When riveting the electromagnetic system, the pressure adjustment of the spanner press and the press should be moderate. Too much pressure will cause coil breakage or coil frame cracking, distortion and winding breakdown. Too little pressure will cause loosening of winding and increase of magnetic loss. Multi-winding coils usually start with different colored leads. When welding, attention should be paid to distinguishing, otherwise the coil will be welded incorrectly. Coils with starting and ending requirements are usually marked by marking method. Attention should be paid to assembly and welding, otherwise the relay level will be opposite.