Pressure stabilizing and water supplying device for thick plate after-rolling cooling system high-pressure section and method thereof

Abstract

The invention relates to the technical field of steel plate after-rolling controlled cooling and discloses a pressure stabilizing and water supplying device for a thick plate after-rolling cooling system high-pressure section and a method thereof. The pressure stabilizing and water supplying device is arranged at an inlet of a middle water collecting pipe of a cooling system. A pressure sensor isarranged in the portion, located at the inlet of the middle water collecting pipe, of a water supply pipe of the pressure stabilizing and water supplying device. One or more water return branch pipesare installed on the water supplying pipe. An electric adjusting valve is arranged in each water return branch pipe. The water return branch pipes communicate with a water return main pipe up to a water supply pool. The water supply pool is provided with a variable frequency water supply pump which is connected with the water supplying pipe. The pressure sensor is arranged on the connecting portion of the variable frequency water supply pump and the water supplying pipe. The rotating speed of the variable frequency water supply pump and the opening degree of the electric adjusting valve are adjusted according to the numerical value of the pressure sensor, closed-loop control of water supply is achieved, the effect of stabilizing water supply pressure is achieved, and the amplitude of watersupply pressure fluctuations of the after-rolling cooling system high-pressure section is reduced remarkably.

Description

technical field [0001] The invention relates to the technical field of cooling control after steel plate rolling, in particular to a water supply device for stabilizing the pressure of the high-pressure section of the cooling system after thick plate rolling and a method thereof. Background technique [0002] Controlled cooling technology of steel plate after rolling refers to the technology of controlling water cooling of steel plate after rolling under certain chemical composition; in general, the process control amount of cooling after rolling includes steel plate inlet water temperature, steel plate outlet water temperature and The water cooling speed of the steel plate, etc., so as to refine the grain and obtain the target crystal structure, and improve the performance of the steel plate. [0003] The post-rolling cooling system is used to control the cooling of the water spray system after the steel plate is rolled. The post-rolling cooling system for thick plates is ...

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Problems solved by technology

[0004] For the steel plate that needs to be cooled by the high-pressure section in the traditional process, when the cooling system after rolling is shielded from the head and tail to change the flow rate, the water output of the water outlet of the cooling system after rolling will change, and the water supply pressure will change greatly. If the pressure is adjusted only by adjusting the speed of the water supply pump, the adjustment of the water supply pressure will lag due to the length of the water supply pipeline, and the speed and accuracy of the speed adjustment of the high-pressure water supply pump cannot meet the requirements of the rapid change of the flow rate of the steel plate. Head and Tail Covering Requirements

[0005] Existing technology: Patent CN200920274299 discloses a water supply device for the cooling system after medium and heavy plate rolling. The cooling header is connected to the cooling header through a high-level water tank with a large cross-section, so that the cooling header can obtain a stable water supply pressure; but the prior art is suitable for the low-pressure section Water supply, not suitable for high pressure section water supply

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