Common problems and measures of relay
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First, the contact is loose and cracked Contacts are electrical contact parts used by relays to switch loads. The contacts of some products are press-fitted by riveting. The main disadvantages are loose contacts, cracked contacts, or excessive size and position deviations. This will affect the contact reliability of the relay. The loose lifting point is caused by the unreasonable size of the matching department of the reed and the contact or the operator's improper adjustment of the riveting pressure. Contact cracking is caused by the material being too hard or too stressed. For the contacts of different materials, different materials are used. Some contact materials with higher hardness should be annealed to perform contact manufacturing, riveting or spot welding. Contact manufacturing should be careful, because the material has tolerances, so the length of each block should be determined after trial. The manufacturing of contacts should not pan the take-off edge, pad injury and non-fullness. The contact riveting is caused by the operator's misalignment of the mold and the misalignment. Contact damage, pollution, oil pollution and iron filings on uncleaned molds. No matter what kind of malady, it will affect the reliability of the relay. Therefore, in the process of contact manufacturing, riveting or welding, we must follow the self-inspection rules of the intermediate sampling of the first inspection and the final inspection to improve the assembly quality. Second, the relay parameters are not chaotic The commensurate department of the components of the electromagnetic relay is riveted, and the main problem is that the riveted part is loose or the bonding strength is poor. This kind of fault will make the relay parameters not chaotic, the parameters change greatly at high and low temperatures, and the resistance to mechanical vibration and shock resistance is poor. The main causes of this problem are the poor tolerance of the rivet, the improper placement of parts, the difference in the quality of the tooling, or the incorrect installation. Therefore, it is necessary to carefully check whether the repair tool and riveted parts meet the requirements before riveting. Deformation of riveting parts of electromagnetic system After riveting, the parts are bent, skewed, and the pier is thick and black, which causes difficulties in assembly or adjustment of the next process, and even causes scrap. The cause of this kind of fault is mainly caused by excessively long riveted parts, too short or uneven force during riveting, misalignment of the mold or incorrect design dimensions, and improper placement of the parts. When performing riveting, the operator should first check the size, shape, and accuracy of the mold. If the mold is not in place, it will affect the assembly quality of the electromagnetic system or the deformation of the core and the thickness of the pier. Damage to glass insulators Glass insulators are made by sintering metal pins and glass. When inspecting, assembling, adjusting, transporting, and cleaning, the pins that are easily protruded are bent. The glass insulators fall off and crack, which causes air leakage and decreases the insulation and pressure resistance. Rolling the pins will also cause the contact reed to shift, affecting the product's reliable on-off. This requires the operator of the assembly to handle it lightly throughout the production of the relay. The parts should be neatly arranged in the transfer box. When assembling or adjusting, do not agree to pull or twist the lead foot. Five, coil failure There are many types of coils used in relays, with or without outsourcing. The coils should be placed separately in special appliances in a separate piece. If they are connected by collision, they will cause disconnection when they are separated. When the electromagnetic system is riveted, the pressure adjustment of the hand press and the press should be moderate. Too much pressure will cause the coil to break or the coil frame to crack, deform, and break down the winding. Too little pressure will cause loose winding and increase magnetic loss. Multi-winding coils are usually made with different color leads. When welding, pay attention to distinguishing, otherwise it will cause coil welding error. The coils with the beginning and end requirements are generally used to mark the beginning and end. Pay attention when assembling and welding, otherwise the relay will be reversed.