A safety control method for ladle shroud

Abstract

The invention provides a steel ladle long nozzle safety control method. The method comprises the steps that a mechanical and hydraulic combination driving device comprising a supporting column, a mechanical arm, a hydraulic cylinder, a manual ball valve, counter weights, a sequence valve, a reversing valve I and a reversing valve II is manufactured; a long nozzle is pressed onto a down nozzle of a steel ladle tightly all the time through the counter weights at the rear end of the mechanical arm; the reversing valve I and the reversing valve II control the front portion of the mechanical arm to descend through the hydraulic cylinder, so that the long nozzle at the front end disengages the down nozzle; two cavities of the hydraulic cylinder communicate with each other to guarantee that the mechanical arm to act accordingly; at overpressure, the sequence valve automatically enables the two cavities of the hydraulic cylinder to communicate with each other to realize the reliability of following actions; and when a hydraulic system fails, actions of the mechanical arms are controlled through the manual ball valve. By means of the method, the accidents of molten steel splashing caused by failures, faulty operation and the like of the hydraulic system can be effectively avoided, and accordingly security control over the long nozzle is realized.

Description

technical field [0001] The invention belongs to the field of mechanical equipment, and in particular relates to a safety control method for a ladle shroud. Background technique [0002] Qualified molten steel is transported to the ladle turret or traverse trolley through the molten steel tank, injected into the tundish through the long nozzle, and then injected into the crystallizer through the submerged nozzle. The use of the tundish realizes the benefits of multi-tank continuous pouring. The function of the long nozzle is to combine with argon blowing to realize protective pouring and prevent secondary oxidation and nitrogen increase of molten steel. Therefore, the long nozzle can not only move up and down with the molten steel tank, but also must always be tightly pressed on the lower nozzle of the molten steel tank to ensure the sealing effect. The shroud manipulator is a special equipment for realizing this function. Whether its action is reliable and convenient will n...

AI Technical Summary

Problems solved by technology

[0008] However, the hydraulic cylinder control method also has the following hidden dangers:

[0009] 1. When the power source fails, such as leakage, energy storage, or failure of the detection element, the manipulator is easy to disengage, and the steel overflows

[0010] 2. The pressure of the back pressure valve is out of balance, and the pressure rises during the falling follow-up process, which may crush the seal of the nozzle, and cause quality accidents due to oxidation of molten steel

[0011] 3. The pressure of the back pressure valve is out of balance. If the pressure is too high during the descending follow-up process, the supporting mechanism of the manipulator will be damaged or damaged. If the supporting mechanism is damaged enough to support the long nozzle, the long nozzle will be separated from the ladle nozzle, resulting in steel overflow.

[0012] 4. The valve element is stuck, the overflow valve is faulty, the upper chamber of the hydraulic cylinder cannot return oil, the rise cannot follow the movement, and the long nozzle is separated from the lower nozzle of the molten steel tank, resulting in a steel-piercing accident

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