Cable

1. Single f copper and aluminum. Copper and aluminum rods commonly used for es are used in normal temperature. The drawing machine is used to pass through one or several die holes of the drawing die to reduce the cross section, increase the length and improve the strength. s the first process of companies, and the main process parameter of s die matching technology.

2. Single . When the copper and aluminum monofilaments are heated to a certain temperature, recrystallization is used to improve the toughness and reduce the strength of monofilaments, so as to meet the requirements of es for conductor cores. The key of annealing process is to prevent the oxidation of copper Stranding of conductors. In order to improve the softness of es and facilitate the laying and installation, the conductive core is made of multiple single e stranding form of conductor core, it can be divided into regular stranding and irregular stranding. Irregular stranding can be divided into bundle stranding, concentric multiple stranding and special stranding.

4. Insulation extrusion. Extruded solid insulation layer is mainly used for plastic es

Eccentricity: the deviation value of the extruded insulation thickness is an important sign of the extrusion process level, and most of the product structure size and its deviation value are clearly specified in the standard. Smoothness: the surface of the extruded insulating layer shall be smooth, and there shall be no bad quality problems such as surface roughness, scorch and impurities. Density: the cross section of the extruded insulation layer shall be compact and firm, without visible pinholes, and the existence of bubbles.

5. For the multi-core cable, in order to ensure the molding degree and reduce the shape of the cable, it is generally necessary to twist it into a circle. The mechanism of stranding is similar to that of conductor stranding. The technical requirements for cable forming are as follows: first, to prevent the twisted cable caused by the turnover of special-shaped insulated core; second, to prevent the insulation layer from being scratched.

6. Inner protective layer. In order to protect the insulated core from being damaged by the armor, it is necessary to protect the insulation layer properly. The inner protection layer is divided into extrusion inner protection layer (isolation sleeve) and winding inner protection layer (cushion). Wrapping cushion instead of binding belt is carried out synchronously with cable forming process.

7. Armor. If the cable is laid underground, it may bear a certain positive pressure, so the inner steel strip armored structure can be selected. When cables are laid under both positive pressure and tensile force (such as water, vertical shaft or soil with large drop), the structural type with inner steel ll be selected.

8. Outer sheath. The outer sheath is a structural part to protect the insulation layer of es from environmental factors. The main function of the outer sheath is to improve the mechanical strength, chemical corrosion resistance, moisture resistance, water immersion and prevent the cable from burning. According to the different requirements of the cable, the plastic sheath is directly extruded by the extruder