CN-224200882-U - Hydraulic device for steel flow control

Abstract

The utility model discloses a hydraulic device for controlling steel flow, which belongs to the technical field of metallurgical equipment and comprises a working energy storage end, an accident energy storage end, an oil return end, a hydraulic cylinder, a water gap control valve and an accident closing valve. And under the normal working condition of the working energy storage end, the hydraulic cylinder is driven by the water gap control valve to adjust the opening of the water gap. The accident energy storage end is used for independently storing energy and is directly communicated with the rodless cavity of the hydraulic cylinder through the accident shutoff valve. When unexpected faults such as power failure, electric signal loss and the like occur, the accident shutoff valve loses power and is connected with the oil inlet P and the working port A, the pressure of the accident energy storage end passes through the accident shutoff valve, oil enters the rodless cavity of the hydraulic cylinder and pushes the stopper rod to close the ladle water gap, and accordingly one-down flow of the ladle molten steel is avoided. The hydraulic device realizes the automatic closing effect of the emergency fault water outlet through the self-driven switching-on function of the accident closing valve when the power is off and the signal is lost.

Inventors

• TIAN ZHIGUO
• ZHANG JUN
• FENG ZHENYA
• CHEN BOTAO

Assignees

• 湖南华菱湘潭钢铁有限公司

Dates

Publication Date

20260505

Application Date

20250630

Claims (10)

1. 1. A hydraulic device for steel flow control, comprising: The hydraulic system comprises a working energy storage end (1), an accident energy storage end (2), an oil return end (3), a hydraulic cylinder (4), a water gap control valve (5) and an accident shutoff valve (6); The working energy storage end (1) controls the action of the hydraulic cylinder (4) through a water gap control valve (5); The oil return end (3) is respectively communicated with an oil return port T of the water gap control valve (5) and an oil return port T of the accident shutoff valve (6) and a rod cavity of the hydraulic cylinder (4).
2. 2. A hydraulic device for steel flow control according to claim 1, characterized in that a first non-return valve (71) is arranged between the accident shut-off valve (6) and the rodless chamber of the hydraulic cylinder (4).
3. 3. A hydraulic device for steel flow control according to claim 1, characterized in that a second non return valve (72) is arranged between the return port T of the accident shut-off valve (6) and the rod chamber of the hydraulic cylinder (4).
4. 4. A hydraulic device for steel flow control according to claim 3, characterized in that a flow sensor (73) is arranged between the outlet conduit of the working port a of the accident shutoff valve (6) and the second non-return valve (72).
5. 5. A hydraulic device for steel flow control according to claim 1, characterized in that the water gap control valve (5) comprises a slow control valve (51) and a fast control valve (52), the slow control valve (51) being connected in parallel with the fast control valve (52).
6. 6. A hydraulic device for steel flow control according to claim 5, characterized in that a speed regulating valve (54) is arranged between the gate control valve (5) and the rodless and rod-like chambers of the hydraulic cylinder (4), respectively.
7. 7. A hydraulic device for steel flow control according to claim 1, characterized in that the nozzle control valve (5) is provided with a hydraulic lock (53).
8. 8. A hydraulic device for steel flow control according to claim 7, characterized in that the rod-like and rodless chambers of the hydraulic cylinder (4) are connected to the return oil end (3) by means of a pressure relief valve (8).
9. 9. A hydraulic device for steel flow control according to claim 1, characterized in that the accident shut-off valve (6) is a two-position four-way valve.
10. 10. A hydraulic device for steel flow control according to claim 1, characterized in that the oil return end (3) is provided with a third non return valve (74).

Description

Hydraulic device for steel flow control Technical Field The utility model belongs to the technical field of metallurgical equipment, and particularly relates to a hydraulic device for steel flow control. Background The continuous casting machine is used as core equipment in the modern ferrous metallurgy industry, and has the core function of continuously casting high-temperature molten steel into a casting blank with a preset cross-section shape. In the continuous casting process, molten steel flows from a tundish into a crystallizer through a submerged nozzle, and is gradually solidified and formed under the traction and cooling of a multi-stage roller system of a sector section. The steel flow control is a key link affecting the quality and the production efficiency of casting blanks, and the core of the steel flow control is to accurately regulate and control the flow speed, the flow quantity and the flow stability of molten steel so as to avoid the defects of leakage, slag rolling, cracks and the like. The hydraulic system is used as a core execution unit for driving and controlling the continuous casting machine, and the dynamic response precision and reliability of the steel flow regulating mechanism are directly determined. At present, a hydraulic servo system is generally adopted for continuous casting machine steel flow control, and displacement and output force of a hydraulic cylinder are regulated through a proportional valve or a servo valve, so that a stopper rod or a sliding gate opening is driven, and closed-loop control of molten steel flow is realized. However, the actual industrial field environment is complex, the hydraulic system may be suddenly powered off or the PLC electrical signal is lost due to power grid fluctuation, equipment failure or signal interference, so that the steel flow control is unstable, serious accidents such as leakage and steel overflow are even caused, and the equipment safety and the production continuity are threatened. For example, patent publication No. CN109611396a discloses an automatic switching hydraulic system for oil supply of a large-ladle sliding gate hydraulic cylinder, which is provided with two independent main system independent oil sources I and two independent main system independent oil sources II, the pressure of two pressure reducing loops is independent oil supply and is not interfered with each other when the pressure switch of each loop displays that the pressure is normal, when one of the pressure is lower than a process set value, a switching on valve and a switching off valve are automatically electrified, the two pressure oil are communicated, and production is continued. However, if two sets of independent oil ways are powered off or the electric signals are lost, the system lacks emergency processing capability, and the sliding water gap cannot be automatically closed. Disclosure of utility model The object of the present utility model is to provide a hydraulic device for steel flow control to solve the problems presented in the prior art mentioned above. There is provided a hydraulic device for steel flow control, comprising: The hydraulic valve comprises a working energy storage end, an accident energy storage end, an oil return end, a hydraulic cylinder, a water gap control valve and an accident closing valve; the working energy storage end controls the action of the hydraulic cylinder through a water gap control valve; The accident energy storage end is communicated with an oil inlet P of the accident shutoff valve, a working port A of the accident shutoff valve is communicated with a rodless cavity of the hydraulic cylinder, and the oil return end is respectively communicated with an oil return port T of the water gap control valve, the oil return port T of the accident shutoff valve and the rod cavity of the hydraulic cylinder. Further, a first one-way valve is arranged between the accident shutoff valve and the rodless cavity of the hydraulic cylinder. The first one-way valve is used for preventing the rodless cavity pressure oil of the hydraulic cylinder from flowing back into the working port A of the accident shutoff valve through the pipeline of the first one-way valve under the normal working condition and directly flowing to the oil return end from the oil return port T of the accident shutoff valve to be discharged. Further, a second one-way valve is arranged between the oil return port T of the accident shutoff valve and the rod cavity of the hydraulic cylinder. And the second one-way valve is used for limiting working oil to directly flow to the oil return end through the second one-way valve when the working energy storage end is used for normally adjusting the pressure of the rod cavity of the hydraulic cylinder. Further, a flow sensor is arranged between the working port A output pipeline of the accident shutoff valve and the second one-way valve. When the flow sensor senses that oil flows through the working port