From the point of view of application, the function of the terminal block should be achieved: it is necessary to conduct the local conduction of the touch part, and the touch is reliable. The insulating part should not be conducted, and it is necessary to insulate it firmly. There are three common forms of fatal problems in terminal blocks:
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 is mated to. Therefore, it is necessary for the touch parts to have excellent structure, stable and reliable touch persistence and outstanding conductive function. Because the structural design of the touch parts is unreasonable, the selection of materials is wrong, the mold is unstable, the processing scale is out of tolerance, the appearance is rough, the surface treatment process such as heat treatment and electroplating is unreasonable, the assembly is not appropriate, the storage and application environment is poor and the operation is improper, and the touch parts and cooperation parts of the touch parts will be defective.
2. Poor insulation
The effect of the insulator is to make the touching piece adhere to the correct position, and to insulate the touch piece from 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 useful 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 material extracts and harmful gas adsorption film are fused with the surface water film to form an ionic conductive channel, moisture absorption, mildew, aging of insulation materials, etc., will form short circuit, leakage, breakdown, low insulation resistance and other insulation defects.
3. Poor fixation
The insulator not only plays an insulating effect, but also usually provides the best alignment and maintenance for the outstretched touch parts, and also has the function of installation and positioning, locking and fixing on the equipment. Poor fixation, light affect the touch firmly to form an instant power failure, 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, which is formed by the unreliable structure of the terminal in the mating state, due to the data, design, process and other reasons, which will form the severe consequences of the interruption of the power transmission and signal control of the control system. Because the design is not reliable, the selection of materials is wrong, the molding process is not properly selected, the heat treatment, mold, installation, welding and other processes are of poor quality, and the installation is not in place.
In addition, the poor appearance caused by the peeling, corrosion, bruises, flash of the plastic shell, cracking, rough processing and deformation of the touch parts, etc., and the poor exchange formed by the positioning and locking cooperation scale, poor processing quality consistency, and excessive total separation force are also common and frequent diseases. These kinds of problems can generally be found and removed in time during the inspection and application process.
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