Production key of multi-core prefabricated branch cable_Anhui Honglin Instrument Cable Co., Ltd.

Production key of multi-core prefabricated branch cable

Author：hlyb Add Time：2016-05-06 16:32:45

Prefabricated branch cable is a new type of cable product to adapt to the continuous development of power supply and distribution system. It is manufactured in advance in the factory according to the user's requirements, which changes the history of making cable joints on the construction site for a long time, so as to greatly improve the reliability of line power supply. The section size and length of prefabricated branch trunk cable and branch cable are determined according to the design requirements

At present, there are three kinds of prefabricated branch cables used in the market. One structure is single core prefabricated branch cable, that is, single core trunk cable and single core branch cable are connected and injected at one time; One structure is a single core twisted preformed branch cable, which is injection molded after the single core trunk cable is connected with the single core branch cable at intervals; The other structure is multi-core prefabricated branch cable, which is that the multi-core insulated wire core is used as the main cable and branch cable after forming the cable, installing the armor and extruding the sheath, and then the corresponding insulated wire cores of the main cable and branch cable are connected respectively and injected at one time; The above three structures are distinguished from the injection molding of prefabricated branch head: the first two can be classified as single core molding prefabricated branch cable, and the latter is multi-core molding prefabricated branch cable. They are widely used in power supply systems such as high and multi-storey buildings, civil residential buildings, tunnels, airports, bridges, subways and highways.

Cavity structure and size

Process control of key processes: measurement, wire stripping, crimping, wrapping and injection molding

1. Measurement: when the branch line is segmented, the length pressed into the branch head must be considered. Generally, the length of the branch line refers to the branch length measured after injection molding the branch head. Therefore, when measuring and intercepting the branch length during production, the length dimension of D in the corresponding cavity diagram in figure 1 must be considered.

2. Stripping: the stripping length of the main cable shall not exceed the length dimension of the corresponding cavity figure h in Figure 1. Strip out the conductor part of the main and branch pipes according to the length parameters of the "C" shaped pipe;

3. Crimping: according to the form of Figure 2, use hydraulic pliers to crimp the main pipe and branch conductor together. Each item must be * * * staggered crimped, and the outer diameter of the crimped branch head must correspond to the relevant dimensions in Figure 1 of the cavity;

4. Wrapping: wrap the compression joint and exposed conductor into mica tape, high-voltage insulating tape, waterproof tape and protective tape in order from inside to outside, then wrap all main and branch insulating wire cores with cushion, * * * and then wrap and weld the main and branch steel strips. In this process, attention must be paid to the cushion treatment between the steel strip and the insulated wire core.

The crimping and wrapping of branch conductor is an important link in the connection of branch cable trunk line and branch line. If there is a problem in the quality of a branch head, it will directly affect the product quality of this cable. Therefore, the manufacturing process control of multi-core branch cable is very important in this process. It is particularly important to strengthen people's sense of responsibility in this process.

6. Injection molding: for injection molding, attention must be paid to the good fluidity of the material. In addition, for some low smoke and halogen-free injection plastics, manufacturers with good tensile strength and elongation at break must be selected. If the material is not selected properly, there will be different degrees of cracking between the branch head and the main line and branch line after injection molding, especially for large-size lines, At the same time, it should be noted that the cooling of the branch head after injection molding should be sufficient before loading the tooling plate. When loading the finished product, it must be considered to select the large cylinder, otherwise there will be a gap at the junction of the cable branch head, which will directly affect the product quality. The multi-core armored power cable shall not be less than 25d, and d = * * * large diameter of the power cable.

With the implementation of Xinjiang and western development strategy, the application scope of multi-core prefabricated branch cable is expanding, and is developing to fire prevention and high flame retardant. The successful development of this product will play a positive role in promoting the industrial adjustment in this region and forming a new economic growth point.

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Production key of multi-core prefabricated branch cable