RU2396356C1 - Metering gate of charging facility of blast furnace - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy, particularly to equipment of system of blast furnace charging. The gate consists of a sealed case wherein there is arranged a branch with an outlet opening, and of two swivel jaws positioned under the output opening. Also the branch is equipped with two plough-shaped insertions, tops of which are directed to each other in vertical plane forming a polygon in cross section of the outlet opening. The plough-shaped insertions are equipped with cutting ribs forming vertical flow of charge by width; the ribs run in vertical plane through sides of polygon in the cross section of the outlet opening.

EFFECT: facilitating shaping flow by width, reducing wear of chute and obtaining required trajectory of charge dumping on process level of blast furnace filling according to specified program.

4 dwg

Description

The invention relates to metallurgy, in particular to cargo closures of loading devices of blast furnaces. The metering shutter of the loading device of the blast furnace contains a sealed housing with a nozzle located in it, under the outlet of which two rotary jaws are located. The section of the nozzle outlet is made in the form of a polygon formed in the nozzle by two plow-shaped inserts with dissecting ribs, the vertices of the inserts are directed to each other in a vertical plane passing along the axis of the nozzle, and the dissecting ribs pass through the sides of the outlet polygon in a vertical plane. The invention allows for any passage of the jaws to ensure optimal passage of the charge, and therefore, improving the conditions for the formation of material on the surface of the rotating distribution tray with the possibility of increasing the contact surface of the rotating tray with the flow of the charge, which leads to uniform formation of the charge on the surface of the tray and thereby reducing wear of the tray. The uniform formation of the charge on the tray improves the technology for the distribution of the charge on the surface of the blast furnace. The invention relates to ferrous metallurgy, and more specifically to cargo closures of loading devices of blast furnaces.

A device is known for volumetric dosing of loose shaft and blast furnaces, which includes a hopper with a helmet-shaped damper located in the outlet channel, driven by a hydraulic drive through a system of levers associated with the axis of rotation, a casing that isolates the dosing device from the environment , and drive; in order to improve the accuracy of dosing, the cross section of the outlet channel has an oval shape or the shape of a polygon approaching an oval (SU No. 576066, class G01 F11 / 00.06.03.73). A disadvantage of the known device is the inability to control the flow rate of the vertical stream without displacing its common central axis. There is also a jaw closure to bunkers for bulk materials, which includes jaws connected by a gear, located in a sealed enclosure having a removable neck - a pipe - and located in a casing with bearings mounted therein, one end of the gear shaft is located the casing, and others in the casing bearings, while the jaws are mounted cantilever at the ends of the shafts located in the casing (copyright certificate SU, class B65 D90 / 58, 08.15.82.

A disadvantage of the known device is the inability to control the flow rate of the vertical stream.

The closest technical result achieved and the number of matching features is the metering shutter of the blast furnace loading device, containing a sealed housing in which a nozzle with an outlet is placed, two rotary jaws located under the outlet, the nozzle is equipped with two plow-shaped inserts, the vertices of which are directed towards each other friend in a vertical plane passing along the axis of the pipe, with the formation of a polygon in the cross section of the outlet. (RU No. 2107735, class C1 С21В 7/18, 01/21/97.)

The disadvantage of the closest analogue is the lack of formation of the width of the vertical flow of the mixture through the area of the polygon in the section of the outlet.

The technical result of the claimed invention is to ensure the formation of the width of the vertical flow of the mixture through the polygon in cross section of the outlet of the metering valve formed by two plow-shaped inserts equipped with dissecting ribs passing through the sides of the polygon in the section of the outlet in the vertical plane and thereby ensuring uniform distribution of the charge over the surface rotating distribution tray.

To ensure the specified technical result in a jaw-type metering shutter that overlaps the nozzle of the hopper for bulk materials and is housed in a sealed housing with bearing assemblies fixed to it, through the glands of which the jaw is mounted cantilever, the shafts are interconnected by a gear for synchronous movement of the jaws in opposite directions, wherein the cross section of the outlet is formed by two plow-shaped inserts, the vertices of which are directed towards each other, in a vertical plane spine extending along the tube axis to form a polygonal cross-sectional outlet opening, wherein the plow-insertion dissecting fins are provided extending through the sides of the polygon in section outlet in a vertical plane. This design of the nozzle allows, by supplying the plow-shaped inserts with dissecting ribs in the vertical plane passing through the sides of the polygon in the cross section of the outlet, to ensure the formation of the width of the charge flow along the surface of the rotating distribution tray, which will ensure uniform discharge of the mixture from the rotating distribution tray onto the surface of the blast furnace charge .

Figure 1 shows a General view of the metering shutter of the boot device, section; figure 2 is a section aa in figure 1; figure 3 is a section bB in figure 1; figure 4 - section bb in figure 3.

The metering shutter of the blast furnace loading device comprises a sealed housing 1, a nozzle 2 connected to the housing 1, two rotary jaws 3, mounted on the ends of the drive shafts 4, passed through the sealing glands 5, openings in the side wall of the shutter housing 1. The shafts 4 are based on rolling bearings 6, on the shafts 4 are installed two identical gears 7, which are engaged with each other. A shutter drive, for example a hydraulic cylinder (not shown), is attached to the free end of one of the shafts. The shape of the outlet of the pipe 2 is made in the form of a polygon formed by two plow-shaped inserts 8 and 9, the vertices of which are directed to each other in a vertical plane, while the plow-shaped inserts have dissecting ribs 10 extending in a vertical plane through the sides of the polygon of the outlet.

The device operates as follows. To open the metering shutter, the shutter drive is activated, which, acting on the shafts 4 through gears 7, synchronously moves the jaws 3 in opposite directions, symmetrically opening the central part of the outlet of the nozzle 2 to a predetermined position, ensuring the outflow of vertical material flow through the polygon area with a given flow rate, while the formation of the flow width across the rotating distribution tray (not shown in the drawings) is carried out by dissecting ribs 10 of the plow-shaped inserts. If necessary, change the flow rate of the material, the jaws 3 are moved, increasing or decreasing the opening area of the outlet formed by two plow-shaped inserts 8 and 9, the vertices of which are directed to each other in a vertical plane, and the flow is formed along the width by dissecting ribs 10. At the same time, the flow rate and the formation along the width of the flow of the mixture occurs without displacement of its common central axes. At the end of the unloading process, the charge of the jaw 3 moves to each other, completely blocking the outlet of the nozzle. The advantage of the invention lies in the fact that it allows you to create a simple design of the metering shutter, providing increased reliability of its operation, while maintaining the ability to accurately control the flow rate and the formation of the vertical flow of the charge without displacing its common central axis and regulating the formation of the width of the axial part due to the shape of the outlet section holes formed by two plow-shaped inserts, the vertices of which are directed to each other and equipped with dissecting ribs passing through side of the polygon in the section of the outlet in the vertical plane.

Claims (1)

A metering shutter of a blast furnace loading device, comprising a sealed housing in which a nozzle with an outlet is located, two pivoting jaws located under the outlet, the nozzle being provided with two plow-shaped inserts whose vertices are directed towards each other in a vertical plane, forming a polygon in the cross section of the outlet, characterized in that for the formation of a vertical flow of the charge along the width of the plow-shaped inserts are equipped with dissecting ribs passing in a vertical plane through the sides of the polygon in the cross section of the exhaust opening.

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