Automatic galvanizing device for continuous hot-dip galvanizing and its application method

Abstract

The invention relates to the equipment field for hot dip coating with a molten state cladding material and without influences on shape, and concretely relates to an automatic zinc adding apparatus forcontinuous hot dip galvanizing and a usage method thereof. The automatic zinc adding apparatus for continuous hot dip galvanizing comprises a first controller (11), and is characterized in that the apparatus also comprises a second controller (12), a main controller (13), a liquidometer (2), and a crane (3); the liquidometer (2) is arranged in zinc liquid in a zinc pot (10), a suspension hook ofthe crane (3) is arranged over the zinc pot (10), and a zinc ingot (20) is suspended on the suspension hook of the crane (3). The usage method of the automatic zinc adding apparatus for continuous hotdip galvanizing is characterized in that the method is enforced according to the following steps in order: i. zinc adding amount is calculated; ii. a zinc adding instruction is generated; iii. zinc is added. The apparatus and the method can be used for timely monitoring, accurately controlling, and conveniently operating with good adaptability.

Description

technical field [0001] The invention relates to the field of equipment used in a hot-dip galvanizing process that uses a molten coating material without affecting the shape, in particular to an automatic galvanizing device for continuous hot-dip galvanizing and a method for using the same. Background technique [0002] Continuous hot-dip galvanizing production line has high productivity and high zinc consumption, usually 1500kg / hour~2000kg / hour. If manual operation is used when adding zinc, the operator’s operating level is required to be high. If the operator adds zinc too quickly, the zinc ingot will absorb heat and melt and take too much heat, making the temperature of the melting zone of the zinc pot too low. On the one hand, it is easy to generate more zinc dross, on the other hand, the unremoved zinc dross during the smelting of the center of the zinc ingot will not be well separated, so that zinc, aluminum and zinc dross are mixed together and float to the surface of ...

AI Technical Summary

Problems solved by technology

If manual operation is used when adding zinc, the operator’s operating level is required to be high. If the operator adds zinc too quickly, the zinc ingot will absorb heat and melt and take too much heat, making the temperature of the melting zone of the zinc pot too low. On the one hand, it is easy to generate more zinc dross, on the other hand, the unremoved zinc dross during the smelting of the center of the zinc ingot will not be well separated, so that zinc, aluminum and zinc dross are mixed together and float to the surface of the zinc liquid, forming a semi-molten state Zinc dross float

If the zinc dross is not removed in time, it will spread to the zinc outlet of the strip steel, affecting the surface quality of the galvanized strip steel; It is easy to cause the zinc liquid level of the zinc pot to fluctuate; if the operator adds zinc too slowly, the liquid level of the zinc pot will drop, causing the liquid level of the zinc pot to fluctuate

Therefore, adding zinc manually can easily lead to unstable product quality, and the labor intensity of the operator is high

Now an automatic zinc addition control system has been put into use. This control system monitors the zinc liquid level through the liquid taste meter in the automatic zinc addition mode, and then discharges the zinc slag through the slag discharge pump, which can control the zinc more accurately than manual operation. Pot liquid level to reduce liquid level fluctuations, but its control principle leads to high requirements for the repeatability of the liquid level gauge and the smooth operation of the slag discharge pump, it is difficult to deal with unexpected situations, such as long-term high temperature causes the liquid level gauge to fail, Lack of timely maintenance of the zinc liquid pump will lead to a decrease in the slag discharge capacity of the zinc liquid pump, which will lead to misjudgment in the automatic zinc addition mode and cannot be used normally. It has to be switched to the manual mode to remove the zinc slag. These defects greatly limit the automatic zinc addition Promotion and use of control systems

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