Closed-loop hot galvanizing production line and control method

Abstract

The invention discloses a closed-loop hot galvanizing production line and a control method. The closed-loop hot galvanizing production line comprises a preplating device (1), a galvanizing device (2),a postplating device (3), a travelling rail unit and an electronic control unit. The device (1) used before galvanizing comprises a degreasing pool (12), a water washing pool I (13), a zinc removal pool (14), an acid cleaning pool (15), a reduction pool (16), a water washing pool II (17), a spraying pool (18), an addition agent pool (19) and a drying chamber (110), wherein the degreasing pool (12), the water washing pool I (13), the zinc removal pool (14), the acid cleaning pool (15), the reduction pool (16), the water washing pool II (17), the spraying pool (18), the addition agent pool (19)and the drying chamber (110) are connected with the interior of a chamber (11) used before galvanizing in sequence. The postplating device (3) and the galvanizing device (2) are perpendicularly arranged. The travelling rail unit comprises a travelling rail device (4) and a travelling rail electronic control circuit, wherein the travelling rail device (4) is located above the preplating device (1), the galvanizing device (2) and the postplating device (3). By the adoption of the closed-loop hot galvanizing production line and the control method, the content of iron entering the hot galvanizingworking procedure can be effectively reduced, the waste of liquid zinc is reduced, the frequency of treatment of dangerous waste iron mud is reduced, the purpose that the surface quality of a galvanized part is better is achieved, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of hot-dip galvanizing production, in particular to a closed-loop hot-dip galvanizing production line and a control method. Background technique [0002] Hot-dip galvanizing is an important process for steel anti-corrosion. It is to immerse steel components in molten zinc to obtain an iron-zinc alloy coating. It has good adhesion and the zinc layer is not easy to fall off. Hot-dip galvanized products have strong anti-corrosion capabilities. , Long service life, wide adaptability to the environment, widely used and served in high-speed railway construction, communication tower construction, urban traffic construction, building steel structure and other infrastructure construction. [0003] During the production process of hot-dip galvanizing, pre-plating treatments such as degreasing, pickling, water washing, and plating flux are required for the galvanized parts. Drying tank, hot-dip galvanizing tank, and c...

AI Technical Summary

Problems solved by technology

[0003] During the production process of hot-dip galvanizing, pre-plating treatments such as degreasing, pickling, water washing, and plating flux are required for the galvanized parts. Drying tank, hot-dip galvanizing tank, and cooling water are used to complete the overall galvanizing, but in practice, after pickling, the surface of the galvanized parts contains a large amount of ferrous ions, and rinsing can only simply remove the ferrous ions initially. The ferrous ions on the surface of the galvanized parts still exist, but the lack of treatment of the ferrous ions results in a high iron content in the hot-dip galvanizing wastewater, resulting in an increase in the viscosity of the zinc bath, a thicker galvanized layer, and a lower galvanizing cost. The increase will make the product quality unstable, and the increase of hazardous waste iron sludge will increase the operating load of recycling and processing, and the environmental treatment pressure will be high

[0004] The pre-treatment, galvanizing and post-processing of the traditional hot-dip galvanizing production line are mostly arranged in a line, which not only takes up a lot of space, but also because of the structure of the line arrangement, the hanging and unloading are at different ends, and the hoisting and driving cannot achieve a closed loop. In actual production, multiple sets of hoisting cranes are required for loading and unloading, and transport back and forth, which not only reduces the overall production efficiency, but also affects the sealing performance of galvanizing and other devices

In addition, the hot-dip galvanizing process in traditional hot-dip galvanizing generally adopts a side-in and side-out arrangement in which the galvanized parts enter from one side of the galvanizing pot (along the width direction) and come out from the other side. Frequent reciprocating movements above the galvanized pot lead to a relatively low production efficiency of 50% to 60% for linear arrangement, and it is necessary to frequently open the two lift doors in the length direction, which reduces the sealing performance of the galvanized pot and affects The fume collecting hood collects the zinc fume; while the production method of galvanized parts entering and exiting from the galvanizing pot (along the length direction) is adopted, the travel path to the cooling pool after galvanizing is long, and the cooling cannot be cooled quickly after galvanizing For example, when hot-dip galvanizing Q345 steel, slow cooling will easily lead to darkening of the steel surface, which cannot meet the domestic quality requirements of hot-dip galvanized steel with strength Q345 and above, and the way of end-in and end-out limits galvanized parts in The swing amplitude on the driving, the galvanized parts cannot be reduced by swinging or vibrating the excess zinc liquid attached to the surface, which is easy to form nodules and uneven streaks on the surface of the galvanized parts, affecting the surface quality

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