Backwash method for filtration system of stainless steel cold rolling mill

Abstract

The invention provides a back rinsing method for the filtering system of a stainless steel cold-rolling mill. The back rinsing method of filtering system includes the following working steps that: (1) the oil inside a main filtering tank is pumped into a dirtied oil tank for 5 minutes; (2) the filter core of the main filtering tank starts to be blown by air for 6 times each layer, 6 seconds each time with a 20-second interval, simultaneously the oil on the bottom of the tank is pumped by using a dirt discharging pump; (3) the oil returns from the dirtied oil tank for 5 minutes after the blowing is finished; (4) the main filtering tank self-circulates for 5 minutes; (5) after the back rinsing of the main filtering tank is finished, a secondary filtering tank starts back rinsing instantly, firstly, the rolling oil of the secondary filtering tank is emptyed for 3 minutes; (6) then the secondary filtering tank is blown by air for 5 times, 2 seconds each time with a 20-second interval; (7)after back rinsing of the main filtering tank is finished, a secondary filtering pump pumps the oil from a graded deposition oil tank to a lower liquid level. The method can shorten the back rinsing period of the filtering system of the stainless steel cold-rolling mill, and timely conduct back rinsing on the filter core of the main filtering tank with over-high differential pressure.

Description

technical field [0001] The invention relates to a backwashing method for a filter system of a stainless steel cold rolling mill. Background technique [0002] In order to ensure the quality of stainless steel products, the rolling oil filtration system is adopted in the stainless steel cold rolling mill in the metallurgical industry, which is mainly composed of the main filtration system and the secondary filtration system. The filtration accuracy and flow rate of the rolling oil will directly affect the product quality. [0003] like image 3 , 4 As shown, the filtering system of rolling oil consists of main filter tank 1', secondary filter tank 2', graded sedimentation oil tank 3', dirty oil tank 4', clean oil tank 5', compressed air tank 6', primary pump 7' , sewage pump 8', secondary filter pump 9'; the oil outlet of the dirty oil tank 4' is connected with the first oil port of the main filter tank 1' through the pneumatic shut-off valve 11' and the primary pump 7' in t...

AI Technical Summary

Problems solved by technology

④. The main filter tank 1′ self-circulates through the secondary pump for 10 minutes. This self-circulation process is a conventional technology, so the secondary pump is not shown in the figure

However, the pressure difference is still above 550mmbar again, and the filter element has almost reached the limit of its life, which has seriously threatened the normal production organization and operation, and has repeatedly caused irregular pressing quality accidents

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