Blowing-free emulsion residue removal method

Abstract

The invention belongs to the technical field of cold-rolled emulsion spot treatment, and in particular relates to a blowing-free emulsion residue removal method, which is applied to various cold-rolling mills. The blowing-free emulsion residue removal method is characterized by comprising the following steps of: 1) blocking low inertia force return of the emulsion; 2) blocking side fluid channeling of the emulsion; 3) blocking fluid channeling of intermediate roll shifting empty emulsion; 4) blocking the condensate of the emulsion; 5) rapidly draining the injection beam of the emulsion; and 6) preventing splashing. The blowing-free emulsion residue removal method has the advantages of simpleness and excellent treatment efficiency.

Description

technical field [0001] The invention belongs to the technical field of cold-rolling emulsification spot treatment, and in particular relates to a method for removing residual emulsion without purging, which is applied to various cold-rolling mill units. Background technique [0002] Emulsion residue is a key factor that restricts the improvement of the yield of cold-rolled products and affects the quality of subsequent coating products. At present, cold rolling at home and abroad generally adopts compressed air blowing method to deal with emulsion residue. Due to the influence of the disturbing airflow field, the compressed air blowing method not only cannot completely remove the emulsion residue, but also causes environmental problems such as a significant increase in energy consumption per ton of steel and high environmental noise. [0003] The sources of emulsion residue are as follows: [0004] 1. When the single-stand reversing cold rolling mill switches between rolli...

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Problems solved by technology

[0007] 1. The purge air flow on the upper and lower surfaces of the strip interferes with each other, resulting in edge channeling that cannot be completely resolved;

[0008] 2. The convection effect brought by the local high-flow compressed air will reduce the local temperature of the roll and change the thermal crown, which is not conducive to the shape control of the strip;

[0009] 3. The large flow of compressed air purging at the edge of the strip will cause a local temperature drop of the roll, resulting in uneven stress on the roll body at the edge of the strip and shortening the service life of the roll;

[0010] 4. The use of a large amount of compressed air makes the power consumption per ton of steel rise rapidly;

[0011] 5. Large flow of compressed air blowing caused serious noise on site

Due to the high temperature of the rolling process, the emulsion evaporates and the high-speed operation of the rollers in the frame causes the emulsion to splash, and condensate is formed at the entrance and exit of the frame; once it drips, it is easy to pollute the surface of the strip steel

[0014] 5. The emulsion injection beam device is equipped in the cold-rolled strip production line (including single-stand rolling mill and continuous rolling mill). Due to the limitation of the equipment structure, the switch valve of the emulsion injection beam is generally set at a distance from the injection beam nozzle. Therefore, when the rolling pass is changed, the residual emulsion in the spray beam will drop to the surface of the cold-rolled strip through the nozzle, which will greatly affect the surface quality and finished product of the cold-rolled strip in the production of cold-rolled strip. Rate

During the rolling process, because the rolling speed is fast and the roll speed is high, the emulsion thrown from the roll to the splash guard will be splashed everywhere at the same time, dripping and adhering to the surface of the strip. The high-speed operation of the strip steel enters the coiling area, resulting in waste of emulsion and excessive residual oil on the strip surface, affecting the cleaning of the plate surface and causing emulsification spots, which greatly affects product quality and yield

At present, some units have taken measures such as adding curtains, but the effect is not very satisfactory.

[0016] 7. During the rolling process of the cold rolling mill, when the rolling speed increases to a certain value, the emulsion used for roll gap lubrication will flow back to the inlet side. The higher the rolling speed, the greater the return flow, and the return flow The emulsion directly affects the detection thickness of the thickness gauge and affects normal rolling

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