1. Poor touch
The metal conductor inside the terminal block is the core part of the terminal, which transmits the voltage, current or signal from the external wire or cable to the touch piece corresponding to the connector it matches. Therefore, it is necessary for the touch parts to have excellent structure, stable and reliable touch persistence and outstanding conductive function. Because the structural planning of the touch parts is unreasonable, the data selection is wrong, the mold is unstable, the processing size is out of tolerance, the appearance is rough, the appearance of heat treatment and electroplating is unreasonable, the assembly is improper, the storage and use environment is poor and the operation is improper, which will constitute a poor touch in the touch part and the cooperation part of the touch part.
2. Poor insulation
The function of the insulator is to make the touching piece adhere to the correct orientation arrangement, and to insulate the contact piece with the touch piece, and between the touch piece and the shell. Therefore, it is necessary for the insulator to have excellent electrical function, mechanical function and process forming function. In particular, with the widespread use of high-density and miniaturized terminal blocks, the effective wall thickness of insulators is getting thinner and thinner. This puts forward more stringent requirements for insulation materials, injection mold accuracy and molding process. Because there are metal residues on the surface or inside of the insulator, the surface dust, flux and other pollution are damp, the organic data extracts and harmful gas adsorption film and the surface water film are blended to form an ionic conductive channel, moisture absorption, mildew, aging of insulation materials, etc., will constitute short circuit, leakage, breakdown, insulation resistance of a lower level of insulation defective phenomenon.
3. Poor fixation
The insulator not only plays the role of insulation, but also usually provides the best alignment and protection for the outstretched touch piece, and also has the function of device positioning and locking and fixing on the equipment. Poor fixation, light affect the touch firmly constitute an instant power failure, and the severe is the disintegration of the product. Dismantling refers to the abnormal separation between the plug and the socket, between the pin and the jack due to the unreliable structure of the terminal in the mating state, due to data, planning, technology and other reasons, which will constitute the severe consequences of the interruption of power transmission and signal control of the control system. Because the planning is not reliable, the material selection is wrong, the molding process is not properly selected, the heat treatment, mold, assembly, welding and other processes are of poor quality, and the assembly is not in place.
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