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Common faults in terminal blocks
The significance of folding prevention
The plastic insulating material and the conductive parts of the terminal are directly related to the quality of the terminal, they determine the insulation and conductive properties of the terminal respectively. Any one terminal failure will lead to the failure of the whole system engineering. This aspect of domestic and international occurrence of painful lessons is very deep.
Prevention is the aim, analysis is the basis. In a sense, the prevention of failure is more important than the analysis of failure. It has a more realistic significance to ensure the quality and reliability of the terminal block.
Terminal from the use of perspective, should achieve the function is: contact parts of the conductive place must be conductive, reliable contact. Insulation parts should not lead to the place must be insulated reliable. The following three forms of fatal faults are common to terminal blocks.
Folded poor contact
The metal conductor inside the terminal is the core component of the terminal, which transmits the voltage, current or signal from the external wire or cable to the corresponding contact parts of the connector with which it is matched. Therefore, the contact must have a good structure, stable and reliable contact retention force and good electrical conductivity. Due to the contact parts structure design is not reasonable, the wrong choice of materials, mold instability, processing size super poor, rough surface, heat treatment plating and other surface treatment process is not reasonable, improper assembly, storage and use of poor environment and improper operation and use, will be in the contact parts of the contact parts and with parts caused by poor contact.
Folded poor insulation
The role of the insulator is to keep the contact parts in the correct position and to insulate the contact parts from each other and from the shell. Therefore, the insulator must have excellent electrical properties, mechanical properties and process molding performance. Especially with the widespread use of high-density, miniaturised terminals, the effective wall thickness of the insulator is becoming thinner and thinner. This puts more stringent requirements on the insulating material, the precision of the injection mould and the moulding process. Due to the insulator surface or internal existence of metal excess, surface dust, solder and other pollution by moisture, organic material precipitates and harmful gas adsorption film and surface water film fusion formation of ionic conductive channel, moisture absorption, long mold, insulation material aging, etc., will cause short circuit, leakage, breakdown, insulation resistance and other poor insulation phenomenon.
Folded poorly fixed
The insulator not only acts as an insulator, but usually also provides precise alignment and protection for the protruding contact parts, and also has the function of mounting and positioning, locking and fixing on the equipment. Fixed bad, the light affect contact reliable cause instantaneous power failure, serious is the product disintegration. Disintegration refers to the terminals in the plug state, due to materials, design, technology and other reasons resulting in unreliable structure caused by the plug and socket between, pin and jack between the abnormal separation, will cause control system power transmission and signal control interruption of the serious consequences. Poor fixing can be caused by unreliable design, wrong choice of materials, improper choice of forming process, poor quality of heat treatment, moulding, assembly, fusion and other processes, poor assembly, etc.
In addition, due to plating skin, corrosion, bruising, plastic shell flying edge, rupture, contact parts processing rough, deformation and other reasons caused by the appearance of bad, due to positioning locking with the size of the poor, poor consistency of processing quality, the total separation force is too large and other reasons caused by the interchangeable bad, is also a common disease, the incidence. These kinds of faults can generally be found in the inspection and use process in time to reject.
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