Terminal harness quality factors and service life

The terminal harness is the wiring component connecting the electrical equipment in the circuit, which is composed of insulation sheath, wiring terminal, wire and insulation wrapping material. The quality and service life of the terminal harness are closely related to the selection of the harness material. Therefore, when selecting the harness material, we must be careful to ensure the quality from the source. 1. Selection of wire materials According to the different use environments, select the appropriate wire materials. For example, the ambient temperature around the automobile engine is high, and there are many corrosive gases and liquids. Therefore, the wire materials with high temperature resistance, oil resistance, vibration resistance and friction resistance must be used. The wire materials on the automatic transmission must be resistant to high temperature and hydraulic oil, and have good temperature stability; Weak signal sensors shall use shielded wires, such as crankshaft position sensor, knock sensor, ABS wheel speed sensor, etc.; the inner wire of the door shall use wires with high bending resistance, etc. 2. Selection of plastic shell The commonly used materials of plastic parts are mainly PA6, PA66, ABS, PBT, pp, etc. When designing the plug-in, different materials can be selected according to different needs. Flame retardant or reinforced materials can also be added to the plastic according to the actual situation to achieve the purpose of reinforcement or flame retardant, such as adding glass fiber reinforcement. 3. Selection of terminal materials The terminal materials are mainly brass and bronze (the hardness of brass is slightly lower than that of bronze), of which brass accounts for a larger proportion. In addition, different plating layers can be selected according to different requirements, such as tin plating, gold plating and the like. IV. Selection of other auxiliary materials The auxiliary materials are wear-resistant, flame-retardant, anti-corrosion, anti-interference, noise reduction and beautification. Generally, the auxiliary materials are selected according to the working environment and space size. Accessories usually have the following: 1, adhesive tape-wiring harness with adhesive tape are PVC tape, acetate tape, insulating tape, conductive tape, copper foil and so on. The adhesive tape plays the role of bundling, insulation, conduction and marking in the harness. Different adhesive label materials can be selected according to different requirements. 2、 sleeving: sleeving includes PVC tube, glass fiber tube, silicone tube, heat-shrinkable tube, spiral tube, etc., which has the functions of flame retardant, insulation and protection. The PVC pipe has good flexibility and bending deformation resistance. 3、 tin material-tin material is also used in large quantities in wiring harness. Tin material includes lead-free tin bar, silver-containing tin bar, tin wire and so on. It is mainly used for immersion tin and welding at the end of wire. It can be selected according to different purposes. 4、 hardware heads are mainly used for injection molding. Hardware heads include DC head, BNC head, stereo head, DB head, USB head, Din head and RCA head. Hardware heads also need to select models, specifications, materials and coatings according to different use environments. 5、 sizing materials-sizing materials are also used for injection molded parts. The commonly used sizing materials are 45p, 60p, etc., which are different in hardness, and can be selected according to the needs. The different choices of colors should also be distinguished. 6、 packaging materials-there are other packaging materials, such as cable ties, end belts, PE bags, cartons, rubber rings, etc., should also be selected according to the packaging requirements. For example, the goods sent abroad need to be packed in double-layer cartons.

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Electronic wiring harness is widely used in our daily life and work, ranging from mechanical equipment to electronic accessories, which can not operate normally without wiring harness as a carrier. The quality can be seen from the service life of the wiring harness. Generally speaking, a high-quality wiring harness can be used until the day when the equipment is scrapped. Of course, the premise is to use it correctly, not to violate the rules or overload the use. Such a high-quality wiring harness is top-notch in both material selection and wiring harness processing technology. 1、 inferior raw materials: the quality of raw materials is directly related to the life of the wiring harness, the wiring harness cable is normally made of pure copper, but not all wiring harness processing manufacturers will abide by the rules of the industry, some wiring harness manufacturers in order to reduce costs, so as to earn more profits, using copper clad steel, iron or copper clad zinc cable to make wiring harnesses. The quality of the wiring harness made of this material can be imagined, not to mention the life span. Illegal use of 2、: The current that can be borne by wire harnesses of different thicknesses is also different. If a thin wire harness is used on a wire harness with too high current, the wire harness will be heated because it cannot bear too much current, resulting in the burning of the wire harness or equipment, or even a fire. Therefore, when using the wire harness, it is necessary to see whether it can bear the corresponding current. 3、 use environment: The use environment of the wiring harness is also a factor that affects the service life of the wiring harness. The service life of the wiring harness used outdoors is definitely not as long as that used indoors. For example, the service life of the wiring harness used in the outdoor advertising light box will be greatly shortened if the wiring harness is exposed to the sun and rain for a long time.

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