KR100803978B1 - Device for maintaining temperature of powder in mold for continuous casting plant - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a powder insulator of a player mold that can insulate the mold powder by using radiant heat of an immersion nozzle to inject molten steel in a tundish into a mold during continuous casting.

Accordingly, the present invention provides a continuous casting machine, a high heat discharging unit installed under the tundish of the continuous casting machine for injecting hot inert gas into powder in a mold, and radiant heat emitted from the immersion nozzle below the tundish. The present invention provides a powder insulator of a player mold including a heat transfer part for transferring the inert gas to a high temperature and selectively driving the heat transfer part to the immersion nozzle under the tundish.

Housing, Pipe, Thermal Plate, Drive Cylinder, Chain

Description

Device for maintaining temperature of powder in mold for continuous casting plant

1 is a partial cutaway perspective view showing a state in which the powder thermostat according to the present invention installed in the instrument,

Figure 2 is a perspective view of a powder thermostat according to the present invention,

3 is a block diagram of a powder thermostat according to the present invention,

4 is a partial detailed view of the powder thermostat according to the present invention;

Figure 5 is a schematic side view showing a state of use of the powder thermostat according to the present invention.

Explanation of symbols on the main parts of the drawings

10 housing 11 insulation

12: heat resistant material 20: pipe

21: thermal insulation plate 22: injection hole

30: driving cylinder 40: bracket

41: chain

The present invention relates to a continuous casting machine, and more particularly to a powder thermostat of the player mold to maintain the warm state of the powder injected into the mold to solve the melt instability of the mold powder due to the decrease in the atmospheric temperature.

In general, continuous casting equipment is a facility that continuously produces slabs of a certain size by receiving molten steel produced in a steelmaking furnace and transferred to ladles and then supplied to a mold.

The equipment is composed of a ladle containing refined molten steel in the steelmaking process, a ladle turret supporting the ladle, and a tundish and a tundish which temporarily store molten steel from the ladle and distribute the molten steel to each strand. Water cooling mold that initially solidifies injected molten steel into a certain shape, secondary cooling table consisting of rolls and spray nozzles that can bend or straighten the casting while removing heat from the non-solidified slabs, and slab cutting device and cast steel Consists of a feed roller table, a cooling yard and a slab surface grinding device.

The mold is subjected to vertical movement in conjunction with the rotation of the pinch roll, while preventing the contact between the molten steel and the atmosphere, absorbing the floating matters separated from the molten steel, melted by the molten steel, and flow between the mold copper plate and the slab to serve as a lubricant. Powder is added to prevent the molten steel from adhering to the mold.

In other words, stainless steel is a very strong affinity with oxygen in the atmosphere, even if tight sealing is usually produced a small amount of inclusions is to prevent this by putting the powder as described above.

In general, the mold powder is preheated or warmed for smooth melting. In particular, since the air temperature is low in winter, the surface of the cast steel can be prevented only by keeping the powder exposed to the atmosphere from the outside.

However, conventionally, a burner is installed on the upper mold to insulate the powder in the mold, and the flame caused by LPG gas is radiated onto the powder in the mold. In addition, problems such as air pollution due to incomplete combustion of LPG gas occur.

In addition, there is a problem that the eyesight of the operator is reduced by the flame, the mold powder layer is excessively burned.

Accordingly, the present invention has been made to solve the above problems, the powder insulation of the player mold that can insulate the mold powder using the radiant heat of the immersion nozzle for injecting molten steel in the tundish into the mold during continuous casting operation The object is to provide a device.

In order to achieve the above object, the present invention is installed in the lower portion of the tundish of the continuous casting equipment, and a high heat discharge unit for injecting a high temperature nitrogen gas into the powder in the mold, and by passing the heat of the immersion nozzle to the nitrogen gas And a heat transfer part for heating nitrogen gas to a high temperature, and a drive part for selectively adhering the heat transfer part to the immersion nozzle under the tundish.

Therefore, about 800 degrees of high heat generated in the process of supplying molten steel to the mold through the immersion nozzle is transferred to the high heat discharge unit to heat the nitrogen gas, and hot nitrogen gas is injected into the powder in the mold to keep the powder warm.

The high heat dissipation unit includes a pipe through which nitrogen gas proceeds, and an insulation plate which is covered on the mold and connected to the pipe to inject nitrogen gas evenly into powder.

The heat transfer part is in close contact with the immersion nozzle outer peripheral surface and includes a housing in which the pipe is installed.

The pipes are preferably arranged zigzag in the housing to maximize the collection area.

In addition, the drive unit is to contact the outer circumferential surface of the immersion nozzle only when the housing of the high heat discharge unit is required only when the upper end of the housing is rotatably installed by the drive cylinder installed in the lower portion of the tundish. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a partially cutaway perspective view showing a state in which the powder thermostat according to the present invention is installed in the instrument, Figure 2 is a perspective view showing the powder thermostat according to the present invention, Figure 3 is a powder thermostat according to the present invention 4 is a detailed view of a powder thermostat according to the present invention.                     

According to the above drawings, the continuous casting equipment is a ladle 100 containing the molten steel refined in the steelmaking process, a tundish for receiving molten steel from the ladle 100 temporarily stores the molten steel and distributes it to each strand 110, the water cooling mold 120 for initially solidifying the molten steel discharged through the immersion nozzle 111 installed in the tundish 110 in a predetermined shape.

In the present invention, in the continuous casting facility of the above-described structure is installed in the lower portion of the tundish 110, a high heat discharge unit for injecting a high temperature nitrogen gas into the powder in the mold 120, the heat of the immersion nozzle 111 And a heat transfer unit for heating the nitrogen gas to a high temperature by transferring the nitrogen gas, and a driving unit for selectively contacting the heat transfer unit to the immersion nozzle 111 under the tundish 110.

 First, from the heat transfer part, it includes a cylindrical housing 10 in close contact with the outer circumferential surface of the immersion nozzle 111.

The housing 10 is formed in a pipe shape having a predetermined thickness and separated into two to be in close contact with the left and right sides of the immersion nozzle 111. And the upper end of each housing 10 is rotatably connected to the lower portion of the tundish 110 and the hinge axis.

Nitrogen gas pipe 20 is installed in the housing 10 and the heat insulating material 11 is filled to transfer the high heat emitted from the immersion nozzle 111 to the pipe 20. In addition, the inner portion of the housing 10 directly exposed to the radiant heat of the immersion nozzle 111 is coated with a heat-resistant material 12 has a structure to protect the steel shell of the housing 10 from high heat.                     

The high heat dissipation part is to insulate the powder by transferring the high heat transmitted from the immersion nozzle 111 through the heat transfer part to the powder in the mold 120, and the nitrogen gas is installed between the heat insulating material 11 in the housing 10. Pipe 20 and the inner hollow insulation plate 21, the insulation plate is connected to the lower end of the housing 10 is placed on the mold 120 and one side is connected to the pipe 20 is supplied with nitrogen gas ( 21) is formed at the bottom and includes a spray hole 22 for injecting a high temperature nitrogen gas over the powder.

Therefore, the nitrogen gas heated through the housing 10 is supplied to the thermal insulation plate 21 connected to the pipe 20 and discharged through the injection hole 22 formed at the lower portion of the thermal insulation plate 21 to insulate the powder. do.

The pipe 20 is bent in a zigzag form so as to maximize the heat collecting area in the housing 10 and installed in the housing 10, and preferably made of a copper material having high heat transfer efficiency.

On the other hand, the housing 10 is in close contact with the outer circumferential surface of the immersion nozzle 111 to receive heat, during the transport of the tundish 110 or assembling and preheating the immersion nozzle 111, the immersion nozzle (111) It must be separated from each other to prevent mutual interference, and for this purpose, a driving part for rotating the housing 10 is required.

The driving unit is for contacting the housing 10, which is rotatably installed at the lower portion of the tundish 110, with the immersion nozzle 111, one end is installed at the lower portion of the tundish 110, and the other end is the housing 10. It is connected to the side is composed of a drive cylinder 30 for rotating the housing 10.

Here, as shown in FIG. 5, the two housings 10 are rotated left and right about the immersion nozzle 111 to be lifted in a horizontal state or erected in a vertical state, in which case the housing 10 is vertically When standing, the insulating plate 21 connected to the housing 10 should be kept horizontal to the mold 120. If the housing 10 is lifted to a horizontal state, the insulating plate 21 is also tundish 110. It is necessary to lay outward to avoid interference with.

To this end, the installation structure between the housing 10 and the thermal insulation plate 21 is installed in the housing 10 by hinged coupling of the thermal insulation plate 21 by installing a bracket 40 bent upwards to the housing 10 as shown in FIG. (10) The horizontal plate 21 is rotated by its own weight so that it can be supported by the lower edge of the bracket 40, the horizontal plate 21 and the lower portion of the tundish 110 is a certain length of chain ( 41, the insulation plate 21 during the vertical rotation of the housing 10 is controlled to be rotated by the chain 41 to maintain a horizontal state.

Hereinafter will be described the operation of the present invention.

Before the first operation, the housing 10 is rotated and lifted up according to the contraction operation of the driving cylinder 30. When the molten steel jet is started to the mold 120 by the immersion nozzle 111 mounted on the tundish 110, the tundish is started. The driving cylinder 30 installed at the bottom of the 110 is extended to close the housing 10 to the immersion nozzle 111.

That is, when the driving cylinder 30 is extended and operated, the housing 10 connected to the front end of the piston rod of the driving cylinder 30 is rotated downward, and when the driving cylinder 30 is fully extended, the housing 10 Is erected vertically, the inner surface is in close contact with the outer peripheral surface of the immersion nozzle 111.

And the thermal insulation plate 21 connected to the lower end of the housing 10 is maintained in a horizontal state on the mold 120 while the rotation is further controlled by the chain 41 connected to the lower tundish 110.

As the housing 10 is in close contact with the immersion nozzle 111, high-temperature radiant heat generated while molten steel passes through the immersion nozzle 111 is transmitted to the housing 10.

Therefore, while the nitrogen gas supplied through the pipe 20 passes through the housing 10 and is heated by the high heat transferred to the housing 10 as described above, the heated nitrogen gas is heated to the insulation plate 21 connected to the outlet of the pipe 20. Will be sent inside.

Nitrogen gas introduced into the heat insulating plate 21 is evenly sprayed into the mold 120 through the plurality of injection holes 22 formed in the heat insulating plate 21 and thus the powder sprayed in the mold 120 It can be kept warm by high temperature nitrogen gas.

On the other hand, when the work is finished and the housing 10 is separated from the immersion nozzle 111 when necessary, when the drive cylinder 30 is contracted by operation, each housing 10 is a rotating shaft with the tundish 110 It is to be lifted in a horizontal state with respect to the center and thus can perform operations such as reassembly of the immersion nozzle 111 without interference of the housing 10.

 According to the powder insulation device of the player mold according to the present invention as described above, by heating the nitrogen gas by using the high heat emitted from the immersion nozzle during continuous casting and spraying the hot nitrogen gas to the powder to keep the powder warm There is no need for a separate heat source.

Therefore, energy can be saved and environmental pollution can be prevented.

Claims (4)

In the continuous casting equipment, A high heat dissipation unit installed under the tundish of the continuous casting facility for injecting high temperature inert gas into powder in a mold; A heat transfer part for transmitting radiant heat emitted from the immersion nozzle below the tundish to the inert gas to heat the inert gas to a high temperature; A driving unit for selectively contacting the heat transfer unit with the immersion nozzle below the tundish Powder thermostat of the player mold comprising a. The powder insulating device of claim 1, wherein the heat transfer part comprises a housing in close contact with an outer circumferential surface of the immersion nozzle, and a heat insulating material filled in the housing. According to claim 1, wherein the high heat discharge unit is a nitrogen gas running pipe is installed between the heat insulating material in the housing, and the inner hollow insulation to be connected to the lower end of the housing is placed on the mold and connected to the pipe on one side is supplied with nitrogen gas Plate, formed on the bottom of the insulating plate powder insulator of the player mold, characterized in that it comprises a spray hole for injecting high temperature nitrogen gas over the powder. According to claim 1, wherein the drive unit is provided with a driving cylinder for rotating the housing which is one end is installed in the lower portion of the tundish and the other end is connected to the housing side is axially coupled to the lower tundish, the insulating plate is the housing It is rotatably coupled to the lower side, the upper portion of the insulating plate and the bottom of the tundish is connected by a chain of a predetermined length so that when the housing is vertically rotated, the insulating plate is controlled by the chain to be controlled to maintain a horizontal state Powder thermostat of machine mold.

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