High-pressure descaling injection valve

Abstract

The invention relates to a high-pressure descaling injection valve. The injection valve comprises an upper air cylinder assembly, a lower air cylinder assembly, an upper plunger assembly, a lower plunger assembly, an air filter, a valve body and a shaft sleeve, the upper plunger assembly and the lower plunger assembly are arranged on the upper side and the lower side of the valve body correspondingly, the upper air cylinder assembly and the lower air cylinder assembly are symmetrically arranged at the upper end and the lower end of the valve body, and the air filter is arranged above the upperair cylinder assembly. According to the technical scheme, the equipment cost is greatly reduced, original pre-flushing units which are in parallel connection with a main pipeline are all omitted, andmeanwhile, the stability of a descaling system is also greatly improved; and the technical scheme skillfully utilizes a key part, namely the injection valve, of the descaling system to output and control pre-flushing water, and then a pre-flushing effect is achieved.

Description

technical field [0001] The invention relates to an injection valve, in particular to a high-pressure descaling injection valve, and belongs to the technical field of descaling equipment on a hot rolling production line. Background technique [0002] In the hot rolling production line, a descaling system is equipped to remove the oxide scale on the surface of the rolled piece before most rolling passes, so as to reduce the oxide on the surface of the rolled piece and ensure the surface quality of the strip. The descaling system is generally composed of a descaling pump station, a filter, a descaling jet valve, and on-site descaling headers; the pumping station sends high-pressure water to the descaling valve, and through the opening and closing control of the descaling valve, After being sent to the descaling header, it is sprayed out through the nozzle. Since the nozzle of the descaling header is in the normally open state, after the descaling injection valve is closed, the...

AI Technical Summary

Problems solved by technology

The existing pre-flush unit has the following disadvantages: 1. The cost is high. When the descaling valve is opened, in order to prevent high-pressure water from entering the low-pressure pre-flush unit, causing damage to system components, the corresponding check valve and safety valve , control reversing valve and other valves are essential; 2. The pre-flushing unit is an essential key unit of the entire descaling system, and the quality of the above components directly determines the stability of the descaling system; preliminary search, China Patent CN201510201042.6 discloses "A Fully Automatic Descaling Control Method for Medium and Heavy Plate Mills", which provides a fully automatic descaling control method for medium and heavy plate rolling mills. The main valve and the pre-flushing water valve are automatically closed in sequence, completing the first Descaling passes

None of the existing solutions solves the technical problem

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