The Experimental Study Of Continuous Hot Dip Galvanized Pot Sealed By Low-frequency Electromagnetic Field

Hot dip galvanized steel sheet and alloy steel plate has ideal comprehensive performances which conclude anticorrosion, shaping, painting and advantages that is low cost and good appearance. Therefore, these kinds of product have been widely used in various fields of national economy. With the high demands for the product function and quality, new technology and equipment is continuously introduced in continuous hot-dip galvanizing line. Electromagnetic enclosed slot technology is a new technology in continuous hot-dip galvanizing line. This new technology takes use of the electromagnetic force to seal liquid zinc in the bottom of the pot that is not closed. Consequently, hot-dip galvanizing line can cancel the device of sink roll and stabilizing roll, also can solve a range of problems which are brought by corrosion of the device in the pot by zinc and contact between strip and the sink roll. Thus, the technology can improve the quality and yield of product, and reduce the cost and labor intensity.Inductor and Channel were designed and made according to principle of electromagnetic field and power was chosen in this paper. Experiment of suspending zinc block by low frequency electromagnetic field was made. It is Obtained Connection between electromagnetic force and current, frequency, gap of sensor and size of zinc block. That is, firstly, at the same sensor gap and frequency, the electromagnetic force increases with the current increasing. Secondly, at the same sensor gap and current, electromagnetic force increases with frequency increasing. In this experimental condition, smaller current can balance the gravity of Zinc block when the power frequency is 70 Hz. Thirdly, the greater sensor gap requires greater current to produce the same electromagnetic force when frequency is same. Therefore,it is the better to choose sensor gap between 20 ~ 40mm. Besides, at the same frequency, sensor gap and current, wider zinc block get bigger electromagnetic force. Therefore, designing the size along the sensor direction of channel should not be too small.Because of difference between solid and liquid in physical parameters and the liquidity, liquid gallium was used to simulate the experiment of enclosing liquid zinc by low frequency electromagnetic filed according to the principle of from simple to difficult and similarity. It is Obtained Connection between electromagnetic force and frequency, the position of liquid gallium in the sensor gap. That is, firstly, at the same sensor gap and current, electromagnetic force increases with frequency increasing. In this experimental condition, the perfect power frequency value that electromagnetic force can balance the gravity of liquid Gallium is 55hz. Under the same experimental parameters, the electromagnetic force of liquid Gallium are nearly identical when the same quality of gallium at different position in the sensor space. Liquid gallium was used to do experiment under three conditions which is without electromagnetic field, applying electromagnetic field and applying electromagnetic field meanwhile changes material of channel. A way that can greatly improve the electromagnetic force of liquid gallium was found through comparing the three above experimental conditions. That is, changing the material of channel.