CN-121977083-A - Be applicable to superhigh temperature molten steel flow control valve

Abstract

The invention discloses a flow control valve suitable for ultra-high temperature molten steel, which belongs to the field of ultra-high temperature valves and comprises a main valve body, a graphite lining, a lining fixed cover plate, an upper plate cover, a lower plate cover and a refractory valve plate. The whole valve is designed with the graphite lining layer, the ceramic heat insulation layer and the hollow convection layer to realize gradient heat regulation, effectively realize heat dissipation of the valve body and the electric element (the valve body is made of 310S stainless steel with the heat resistance limit of 1200 ℃), keep the internal temperature constant (the temperature of the inner wall of the graphite lining layer is more than 1600 ℃), and avoid condensation of molten steel. The invention adopts the inclined fireproof valve plate as the core adjusting element, and is matched with the graphite lining, so that the adhesion of molten steel on the plate surface can be reduced in the process of adjusting the flow of molten steel, and the service life is prolonged.

Inventors

• YUAN MINXIN
• Li Pubo
• Meng Cunrui
• LIU ZENGQIANG
• KANG JIANING
• ZHANG YONG
• ZHU MIN

Assignees

• 六盘山实验室

Dates

Publication Date

20260505

Application Date

20260225

Claims (9)

1. 1. The utility model provides a be applicable to super high temperature molten steel flow control valve which characterized in that includes main valve body, graphite inside lining, inside lining fixed cover plate, upper plate lid, lower plate lid and fire-resistant valve plate; the graphite lining is fixed on the inner surface of the main valve body through a lining fixing bolt and a lining fixing nut, and the lining fixing cover plate is fixed above the main valve body through a cover plate fixing screw; The main valve body and the graphite lining are respectively provided with an inclined square hole, and the inclined square holes of the main valve body and the graphite lining correspond to each other; the upper plate cover and the lower plate cover are welded and fixed in the inclined square hole, the upper plate cover and the lower plate cover are combined to form a hollow cavity, and the upper plate cover and the lower plate cover are fixedly connected through plate cover screws; the fire-resistant valve plate is fixed in the hollow cavity through a valve plate fixing bolt and a valve plate fixing nut, and the bottom end of the fire-resistant valve plate extends into the graphite lining; the electric push rod is arranged in parallel with the fire-resistant valve plate, and the top end of the electric push rod and the top end of the fire-resistant valve plate are positioned on the same vertical plane; The top of electric putter is equipped with the push rod connecting plate, the one end of push rod connecting plate pass through the screw with electric putter's top fixed connection, the other end of push rod connecting plate pass through the screw with the top of fire-resistant valve plate is connected.
2. 2. The ultra-high temperature molten steel flow control valve according to claim 1, wherein an inner lining fixing plate is fixedly arranged between the main valve body and the graphite inner lining, a gap exists between the inner lining fixing plate and the main valve body to form a natural convection layer, and an inclined square hole is formed in the inner lining fixing plate and corresponds to the inclined square hole in the main valve body.
3. 3. The valve for controlling the flow of the ultra-high temperature molten steel according to claim 2, wherein a ceramic heat insulation plate is fixedly arranged between the inner lining fixing plate and the graphite inner lining, and an inclined square hole is formed in the ceramic heat insulation plate and corresponds to the inclined square hole in the main valve body.
4. 4. The valve for controlling the flow of the ultra-high temperature molten steel according to claim 1, wherein the valve is further provided with a guide steel bar which is fixedly attached to the surface of the refractory valve plate and is fixed through a valve plate fixing bolt and a valve plate fixing nut.
5. 5. The valve for controlling the flow of ultra-high temperature molten steel according to claim 1, wherein the surface of the inner lining fixing cover plate is provided with a plurality of heat dissipation holes.
6. 6. The valve for controlling the flow of ultra-high temperature molten steel according to claim 1, wherein the refractory valve plate is formed by mold opening and firing of magnesia carbon bricks as main materials.
7. 7. A valve for ultra-high temperature molten steel flow control as claimed in claim 1 wherein said refractory valve plate and graphite lining have thermal expansion deformation gaps.
8. 8. The valve for controlling the flow of ultra-high temperature molten steel according to claim 1, wherein a plurality of cooling fins are welded and fixed on the outer surfaces of the upper plate cover and the lower plate cover.
9. 9. The valve for controlling the flow of the ultra-high temperature molten steel according to claim 1 or 8, wherein an inclined plate is arranged on the outer surface of the lower plate cover, the inclined plate is perpendicular to the moving direction of the refractory valve plate, and the electric push rod is fixed on the inclined plate.

Description

Be applicable to superhigh temperature molten steel flow control valve Technical Field The invention relates to the field of ultra-high temperature valves, in particular to a flow control valve suitable for ultra-high temperature molten steel (1700 ℃). Background In the steel smelting casting process, the molten steel flow and the casting speed directly influence the mold filling integrity and the internal quality of the casting, and are core control parameters in the casting process. The filling speed is high, the oxidation of molten metal can be reduced, the simultaneous solidification is facilitated, and shrinkage cavity is reduced. However, too high a flow rate can severely impact the mold, and gas is easily involved, so that defects such as air holes and slag inclusion are caused. Too low flow rate can aggravate the baking effect of the molten metal on the casting mold, and surface defects such as sand inclusion, sand sticking and the like are easy to generate, and even incomplete filling can be caused. At present, the problems are mainly as follows: The existing regulating mode mostly adopts a graphite stopper rod to be matched with a submerged nozzle to open and close so as to realize the regulation and control of molten steel flow, has poor regulating effect, depends on the proficiency of operators, is easy to cause the breakage of the graphite stopper rod, further causes casting accidents, influences casting quality and the like. The control valve is a core terminal element of industrial automation, and can accurately adjust the flow and the flow velocity of different media. However, the conventional high-temperature control valve is easy to generate material creep and oxidation deformation under extreme working conditions (1700 ℃ molten steel), so that the abrasion and bonding of a sealing surface are aggravated, and the problems of leakage, clamping stagnation and the like are caused. Therefore, how to optimize the overall structure and develop the ultra-efficient heat insulation structure and method becomes a key technical challenge to be solved by those skilled in the art of ultra-high temperature valves. Disclosure of Invention In view of this, the present invention provides a flow control valve suitable for 1700 ℃ ultra-high temperature molten steel. In order to achieve the above purpose, the invention adopts the following technical scheme: a flow control valve suitable for ultra-high temperature molten steel comprises a main valve body, a graphite lining, a lining fixed cover plate, an upper plate cover, a lower plate cover and a refractory valve plate; the upper end face of the main valve body is provided with a standard flange hole which is connected with the bottom of the casting ladle; the graphite lining is fixed on the inner surface of the main valve body through a lining fixing bolt and a lining fixing nut, and the lining fixing cover plate is fixed above the main valve body through a cover plate fixing screw; The main valve body and the graphite lining are respectively provided with an inclined square hole, and the inclined square holes of the main valve body and the graphite lining correspond to each other; the upper plate cover and the lower plate cover are welded and fixed in the inclined square hole, the upper plate cover and the lower plate cover are combined to form a hollow cavity, and the upper plate cover and the lower plate cover are fixedly connected through plate cover screws; the fire-resistant valve plate is fixed in the hollow cavity through a valve plate fixing bolt and a valve plate fixing nut, and the bottom end of the fire-resistant valve plate extends into the graphite lining; the electric push rod is arranged in parallel with the fire-resistant valve plate, and the top end of the electric push rod and the top end of the fire-resistant valve plate are positioned on the same vertical plane; The top of electric putter is equipped with the push rod connecting plate, the one end of push rod connecting plate pass through the screw with electric putter's top fixed connection, the other end of push rod connecting plate pass through the screw with the top of fire-resistant valve plate is connected. The main valve body inner wall is equipped with 4 circular shoulders, conveniently fixes inside lining fixed plate, ceramic heat insulating board and graphite lining when forming natural troposphere, graphite lining terminal surface compresses tightly with the ladle bottom to scribble refractory coating, prevent that the molten steel from leaking from the gap. Further, an inner lining fixing plate is fixedly arranged between the main valve body and the graphite inner lining, a gap exists between the inner lining fixing plate and the main valve body to form a natural troposphere, and an inclined square hole is formed in the inner lining fixing plate and corresponds to the inclined square hole in the main valve body. Furthermore, a ceramic heat insulation plate is fixedly arrange