Common faults in terminal blocks

From the point of view of the use of the terminal, the function that should be achieved is that the contact area must be conductive and the contact is reliable. The place where the insulation is not to be turned on must be insulated and reliable. There are three common types of fatal faults in terminal blocks:

1. Problems with poor contact

The metal conductor inside the terminal is the core part of the terminal that transfers the voltage, current or signal from the external wire or cable to the corresponding contact of the mating connector. Therefore, the contact member must have an excellent structure, stable and reliable contact retention and good electrical conductivity. Due to the unreasonable design of the contact structure, the wrong selection of materials, unstable mold, poor processing dimensions, rough surface, unreasonable surface treatment process such as heat treatment plating, improper assembly, poor storage and use environment, and improper operation, will be in the contact parts. Contact and fitting parts cause poor contact.

2, poor insulation

The function of the insulator is to keep the contacts in the correct position and to insulate the contacts from the contacts and the contacts from the housing. Therefore, the insulation must have excellent electrical properties, mechanical properties and process forming properties. In particular, with the high density and wide use of miniaturized terminals, the effective wall thickness of the insulator is getting thinner and thinner. This puts more stringent requirements on insulation materials, injection mold precision and molding processes. Due to the presence of metal excesses on the surface or inside of the insulator, surface dust, flux and other pollution are damp, organic material precipitates and harmful gas adsorption film and surface water film fuse to form ionic conductive channels, moisture absorption, mildew, insulation material aging and other reasons, It will cause short circuit, leakage, breakdown, low insulation resistance and other insulation problems.

 

3, the problem of poor fixation

The insulator not only acts as an insulator, but also provides precise centering and protection for the extended contacts, as well as mounting and locking to the device. Poor fixing, light contact affects reliable momentary power outage, and serious product disintegration. Disintegration refers to the abnormal separation between the plug and the socket between the plug and the socket caused by the unreliable structure due to the material, design, process, etc., and the power transmission of the control system is caused by the disconnection of the terminal. The serious consequences of signal control interruption. Due to unreliable design, incorrect material selection, improper selection of molding process, poor quality of heat treatment, mold, assembly, welding, etc., assembly failure, etc. will result in poor fixation.

In addition, due to coating peeling, corrosion, bumping, plastic shell flashing, cracking, rough processing of contact parts, deformation and other reasons caused by poor appearance, due to the positioning of the locking fit, the processing quality is poor, the total separation force Poor exchange caused by a large number of reasons is also a common disease and frequently-occurring disease. These kinds of faults can generally be found in the inspection and use process in time.http://www.dgcncstamping.com/

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