Elements affecting the quality of terminal harnesses

　Terminal harness is a circuit to connect the wiring components of the electrical appliances, by the insulating sheath, terminal blocks, transmission lines and insulation layer bundled with raw materials and other components, the quality of the terminal harness and the use of the term and the choice of harness materials are closely related, and therefore in the choice of raw materials for the harness, we must be careful and cautious, from the roots of the quality of the first pass.

Elements affecting the quality of the terminal harness: First, the choice of wire. According to the different application environments, select the appropriate wire, for example: high temperature around the engine, corrosive air and liquids are also many, therefore, must apply heat-resistant, acid and alkali resistance, vibration resistance, wear-resistant wire; automatic transmission on the wire must be heat-resistant, resistant to gear oil, and its temperature stability is better; weak data signal sensor to use the shielding off the transmission line, such as engine crankshaft sensors and vibration sensors, ABS wheel speed sensor, etc.; door to go inside the line must be used to resist bending high toward the wire, etc.. Second, the choice of plastic shell. Plastic parts of the common material specific PA6, PA66, ABS, PBT, pp, etc., the design of plug-ins can be based on different requirements to choose different materials, but also based on the specific circumstances of the plastic plus flame retardant or improve the raw materials, in order to achieve the purpose of improving or flame retardant, such as glass fiber to improve and so on. Third, the choice of materials for terminals. Terminal materials are mainly copper and brass (the strength of copper is slightly lower than the strength of brass), in which the proportion of copper is relatively large. In addition, according to the different requirements of the choice of different coatings, such as tin plating, gold plating and so on. Fourth, the choice of other auxiliary materials. Wire harness accessories with wear resistance, flame retardant, corrosion resistance, to avoid the impact of reducing noise, decorative appearance of the effect, generally based on the environment and the size of the space to choose accessories. Auxiliary materials usually have the following categories: 1, tape class - wire harness tape with PVC tape, glacial acetic acid tape, insulation tape, conductive tape, copper berth and so on. Tape in the harness with binding, insulation, conductivity, for marking and other effects. According to different requirements to choose different tape marking materials. 2, waterproof casing class - casing class has PVC pipe, glass fiber tube, silicone hose, heat shrinkable tubing, spiral steel tube, etc., with flame retardant, insulation layer, maintenance, etc. PVC pipe flexibility and resistance to bending and deformation of a good. 3, tin material class --Tin in the harness is also used in a very large amount of tin, tin has lead-free tin, silver-containing solder bars, tin wire these, applicable to the end of the wire dipping tin and soldering, and so on. Can be used in accordance with different purposes, to choose. 4, hardware head class - hardware head for plastic parts, hardware head DC head, BNC head, surround sound head, DB head, USB head, DIN head, RCA head. Hardware head should also be in accordance with the different application conditions to choose the specifications and materials and coatings. 5, plastic pellets - the same plastic material used in plastic parts, common plastic pellets are 45P, 60P, etc., its hard and soft, according to the need to choose, there are also different color choices need to make a difference. 6, packaging products --There are other packaging products, such as cable ties, end tape, PE bags, paper boxes, seals, but also according to the packaging regulations to choose. Such as goods sent to overseas must use two layers of paper boxes to pack.

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