Every day, the power cord is produced. The power cord has to be more than 100,000 meters a day, and the plug is 50,000. With such huge data, the production process must be very stable and mature. After continuous exploration and research, and the European VDE certification body, the national standard CCC power line certification body, the US UL personnel, the British BS certification body, the Australian SAA certification body .........., the power cord plug has matured, below To introduce:
1. Power cord copper, aluminum monofilament drawing
Commonly used copper and aluminum rods for power cords, at room temperature, use a wire drawing machine to pass through the die holes of one or several stretch dies to reduce the cross section, length, and strength. Drawing is the first process of wire and cable companies. The primary process parameter for drawing is the matching technology.
2. Power cord monofilament annealing
Copper and aluminum monofilaments are heated to a certain temperature to recrystallize the toughness of the monofilament and reduce the strength of the monofilament to meet the requirements of the wire and cable for the conductive core. The key to the annealing process is the oxidation of the copper wire.
3. Twisting of power line conductors
In order to improve the flexibility of the power cord, in order to facilitate the laying of the device, the conductive core receives a plurality of monofilament strands. From the twisting manner of the conductive core, it can be divided into regular stranding and irregular stranding. Non-standard stranding is divided into beam stranding, core twisting, and extraordinary stranding. In order to reduce the occupied area of ​​the wire and reduce the geometrical size of the power line, the twisted conductor is also pressed to make the common circular shape into a semicircle, a fan shape, a tile shape and a compact circular shape. This type of conductor is primarily used on power lines.
4. Power cord insulation extrusion
The plastic power cord is mainly made of extruded solid insulation layer. The primary technical requirements for plastic insulation extrusion are:
4.1. Degree of partial pain: The bias value of the thickness of the extruded insulation is the main indicator of the degree of extrusion work. Most of the product structural dimensions and their bias values ​​have clear rules in the specification.
4.2. Lubricity: The outer surface of the extruded insulation layer requires lubrication, and shall not present the poor quality of rough, charred and impurities.
4.3. Density: The cross section of the extruded insulation layer should be dense and strong, and the pinholes visible to the naked eye should be banned.
5. Power cord is wired
Regarding the multi-core power cord, in order to ensure the degree of forming and to reduce the shape of the power cord, it is generally required to twist it into a circular shape. The mechanism of stranding is similar to that of conductor stranding. Because of the large diameter of the stranding, most of the methods are not back-twisted. The technical requirements for cable-forming: First, the twisted-out insulated core turns over and causes the cable to twist; the second is to avoid the insulation layer being scratched.
Most of the cable is also completed in the other two processes: one is filling, the rounding and unchanging of the cable after the pipe is formed; one is tying, and the cable core is not slack.
6. Power cord inner sheath
In order to maintain the insulated core without being damaged by the armor, the insulation layer needs to be properly maintained. The inner sheath is divided into an inner sheath (isolation sleeve) and a inner sheath (cushion). Replacing the tie wrap with the wrap is performed in synchronization with the cabling process.
7. Power cord assembly
Laid on the underground power line, the task can accept the necessary positive pressure effect, you can choose the inner steel belt armor structure. The power cord is laid in a place with both positive pressure effect and tensile effect (such as water, vertical shaft or soil with large drop). The selector has a structural form of inner steel wire armor.
8. Power cord outer sheath
The outer sheath is a structural part that maintains the insulation of the power cord to avoid corrosion of the elements. The primary effect of the outer sheath is to improve the mechanical strength of the power cord, prevent chemical attack, moisture, water immersion, and prevent the power cord from burning. According to the divergence of the power cord, the extruder is used to directly squeeze the plastic sheath.
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