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Study on the Control System of Vertical Tin-Plating Process for Semi-Flexible Coaxial Cable

The control system of vertical tin-plating for semi-flexible coaxial cable was introduced in this present paper. The control objects of this control system included the molten tin temperature, the immerging depth and the feeding speed of the cable. In this control system, the feeding speed of the cable was controlled and displayed in range of 2~22 m/min. The lifting metal box driven by a motor was used to control the immerging depth. The immerging depth and time of the cable in the molten tin solder was controlled in 10~100 mm and no more than 3 sec, respectively. Using two thermocouples could reduce the measurement error caused by uneven distribution of molten tin temperature in the tin tank. The control range of molten tin temperature was about 100~400°C. The tension detecting device ensured the tension of the cable in a suitable range. A smooth and continuous tin coating on the outer conductor was obtained at the cable speed 4~6 m/min, the immerging length 40~80 mm, the immerging time 0.5~1 sec and the molten tin temperature 255~265°Cwith this control system.