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Drawing of copper and aluminum monofilament for power line
Copper and aluminum rods commonly used for power lines are used to draw the die holes of one or several drawing dies at room temperature, so as to reduce the cross-section, increase the length and improve the strength. Wire drawing is the first process of wire and cable companies, and the
primary process parameter is die matching technology.
primary process parameter is die matching technology.
Single wire annealing of power cord
When the copper and aluminum monofilament is heated to a certain temperature, recrystallization is used to improve the toughness and reduce the strength of the single wire, so as to meet the requirements of wire and cable for conductor core. The key of anneal process is the oxidation of root
absolutely copper wire
absolutely copper wire
In order to improve the flexibility of the power line and facilitate the laying device, the conductor core is made of multiple single wires. From the stranding way of conductor core, it can be divided into regular stranding and irregular stranding. Irregular stranding is divided into bundle stranding, concentric
multiple stranding, special stranding, etc. In order to reduce the occupied area of the conductor and reduce the geometric size of the power line, the tight pressing method is also used in the stranded conductor to make the circular shape
multiple stranding, special stranding, etc. In order to reduce the occupied area of the conductor and reduce the geometric size of the power line, the tight pressing method is also used in the stranded conductor to make the circular shape
The shape changes into semicircle, fan-shaped, tile shaped and pressed circle. This kind of conductor is mainly used in power line.
Extruding solid insulation layer is the first choice for power line insulation extrusion plastic power line
1. Degree of migraine: the deviation value of the extruded insulation thickness is the main mark of the degree of extrusion process. Most of the product structure size and its deviation value have clear rules in the specification.
2. Lubrication degree: the surface of the extruded insulation layer is required to be lubricated, and no poor quality problems such as rough appearance, scorching and impurities are allowed
3. Density: the cross section of the extruded insulating layer should be compact and robust, and there should be no visible pinholes and bubbles at the root.
The power line is wired
About the multi-core power line, in order to ensure the molding degree and reduce the shape of the power line, it is generally required to twist it into a circle. The mechanism of stranding is similar to that of conductor stranding, because the pitch diameter of stranding is large, the method of no
untwisting is mostly adopted. The technical requirements of cable laying are as follows: first, eliminate the twisting of cable caused by turning over of special-shaped insulation core; second, avoid scratching the insulation layer.
untwisting is mostly adopted. The technical requirements of cable laying are as follows: first, eliminate the twisting of cable caused by turning over of special-shaped insulation core; second, avoid scratching the insulation layer.
Most of the cables are completed along with the completion of other two procedures: one is filling, and the other is binding to ensure that the cable core is not loose.
Inner sheath power supply
In order to protect the insulated core from being damaged by armor, it is necessary to properly maintain the insulation layer. The inner sheath is divided into extruded inner sheath (isolation sleeve) and wrapped inner sheath (cushion). Wrapping cushion instead of binding belt is carried out
synchronously with cable laying process.
synchronously with cable laying process.
