| 摘要 |
PURPOSE:To decrease the variance in the weights of hot dip-plated zinc upon a strip by maintaing the distance from the surfaces of the strip and the leading ends of the nozzles of gas wiping devices at certain intended value by moving the gas wiping devices in correspondence to the oscillations of the strip. CONSTITUTION:A strip 5 which advances in an arrow direction and is stuck with zinc in a zinc plating bath 1 is passed between wiping nozzles 3 and 3, whereby the weights of hot dip-plated zinc are controlled. Here, the amplitudes of the strip 5 oscillating between pinch rolls 12 and top roll 4 are detected 9, and the detection signals thereof are fed to an arithmetic controller 10. The controller 10 calculates the amplitude of the strip 5 in the set position of the nozzles in accordance with said signals, and feeds the signals corresponding to these to servocontrol valve mechanisms 7. The mechanism 7 supplied with working fluid of high pressure controls the flow rates and directions of the working fluid according to the signals from the controller 10 and feeds the controlled working fluid to driving devices 6 consisting of oil hydraulic cylinders which in turn move and control the nozzles 3 in such a way that the spacings from the strip 5 are maintained at a constant set value. |
