Vacuumizing control method and system of VD mechanical pump

Abstract

The embodiment of the invention discloses a vacuumizing control method and system of a VD mechanical pump. The vacuumizing control method of the VD mechanical pump comprises the following steps: detecting a position of a tank cover used for covering a vacuum tank after a steel ladle enters the vacuum tank, judging whether the tank cover reaches a preset position in the vacuum tank, when the tank cover reaches the preset position in the vacuum tank, performing pre-vacuumizing treatment in the vacuum tank, and orderly performing in-tank pressure-holding treatment, deep vacuumizing treatment, pre-vacuum-breaking treatment and vacuum-breaking treatment in the vacuum tank after the pre-vacuumizing treatment. The vacuumizing treatment is performed on the molten steel in the steel ladle in the vacuum tank through the vacuumizing control method of the VD mechanical pump, the equipment damage caused by molten steel slag-overflow in the steel ladle is effectively avoided, the impurities and a large amount of gas in the molten steel can be effectively removed, the cleanliness of the molten steel and the quality of the manufactured steel can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a vacuum control method and a vacuum control system of a VD mechanical pump. Background technique [0002] The VD (Vacuum Degassing, vacuum degassing) refining method is also called the ladle vacuum refining method. The VD mechanical pump puts the ladle containing the molten steel together in a sealable vacuum tank for vacuuming operation, and at the same time cooperates with the bottom blowing gas stirring of the ladle. The method of removing the gas (hydrogen, nitrogen) content in molten steel is achieved by using the formed vacuum environment and strong bottom blowing gas stirring. [0003] With the development of science and technology, especially the aerospace, national defense, transportation, petroleum and automobile industries have increasingly stringent requirements on steel properties. In order to meet the needs of high strength, long life, corrosion resistance and ...

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Problems solved by technology

[0006] The embodiment of the present invention provides a vacuum pumping control method and a vacuum pumping control system of a VD mechanical pump to solve the problem of directly injecting high-flow argon gas at the bottom of the ladle through manual control of the ladle vacuuming process in the prior art. It is easy to cause molten steel slag overflow in the ladle, which will not only cause safety accidents such as equipment damage, but also is not conducive to the isolation protection of the molten steel and the atmosphere by the refining slag after the molten steel in the ladle is broken, and the refining slag absorbs inclusions in the molten steel, thereby reducing the cleanliness of the steel. Degree, the problem that affects the quality of steel

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