Common failures of insulators
1. Poor contact
The metal conductor inside the terminal is the core part of the terminal. It transmits the voltage, current or signal from the external wire or cable to the corresponding contact piece of the matching connector. Therefore, the contact must have an excellent structure, stable and reliable contact retention and good electrical conductivity. Due to unreasonable structural design of contact parts, wrong material selection, unstable mold, excessively poor processing size, rough surface, heat treatment electroplating and other surface treatment processes, improper assembly, poor storage and use environment, and improper operation and use, all Poor contact due to contact and mating parts.
2. Poor insulation
The role of the insulator is to maintain the correct arrangement of the contact pieces, and to insulate the contact pieces and the contact pieces, and the contact pieces and the housing from each other. Therefore, the insulation must have excellent electrical properties, mechanical properties and process forming properties. Especially with the high density and the widespread use of miniaturized terminal blocks, the effective wall thickness of insulators is getting thinner and thinner. This puts more stringent requirements on insulation materials, injection mold accuracy and molding process. Due to the presence of metal residues on the surface or inside of the insulator, surface dust, flux and other pollution and moisture, organic material precipitates and harmful gas adsorption films are fused with the surface water film to form ionic conductive channels, moisture absorption, mold growth, and aging of insulating materials. It will cause short circuit, leakage, breakdown, low insulation resistance and other poor insulation.
3. Poor fixation
The insulator not only plays the role of insulation, but also provides accurate centering and protection for the protruding contacts. It also has the functions of installation positioning, locking and fixing on the equipment. Poor fixation, which may affect the reliability of contact and cause instantaneous power failure. The most serious problem is the disintegration of the product. Disassembly refers to the abnormal separation between the plug and the socket, the pin and the jack caused by the unreliable structure of the terminal due to the material, design, process, etc. under the mating state of the terminal, which will cause the control system to transmit power and Serious consequences of signal control interruption. Due to unreliable design, wrong material selection, improper selection of molding process, poor quality of heat treatment, mold, assembly, welding and other processes, poor assembly will cause poor fixation.