The control cable is mainly composed of multi-layer insulation layer, PP filler and non magnetic steel shielding armor layer. The copper conductor is wrapped with PVC insulation layer, and polypropylene filler is filled between PVC coating layer and PVC insulation layer. The outer layer of PVC coating layer is provided with a non-magnetic steel shielding armor layer, and the non-magnetic steel shielding armor layer is wrapped with a PVC sheath layer.
This kind of cable can not only play the role of shielding external disturbance, but also play the role of armouring and maintaining the internal insulation core. Compared with the traditional control cable, the process is less, the production efficiency is high, and it can be produced continuously. The purpose of adding armor layer to the function cable of the control cable is not only to enhance the tensile strength, compressive strength and other mechanical protection, but also to improve the anti-interference performance of the cable through shielding maintenance.
The commonly used armor materials for control cables include steel strip, steel wire, aluminum strip, aluminum tube, etc. The steel tape and steel wire armouring layer have high magnetic permeability and good magnetic shielding effect, which can be used to resist low-frequency disturbance and enable the armored cable to be directly buried and laid without passing through the pipeline. It is cheap and has good practical application effect.
The mechanical maintenance layer of the cable can be added to the cable of any structure to increase the mechanical strength of the cable and improve the corrosion resistance. This is a special kind of cable, which is planned to be used in areas vulnerable to mechanical damage and corrosion. It can be laid arbitrarily, and is more suitable for direct burial in rock areas.
