JPH04154906A - Device for attaching/detaching gas supplying pipe to ladle - Google Patents

Abstract

PURPOSE:To automatically enable attachment/detachment of a gas supplying pipe without clogging the gas pipe by attaching/detaching end part of the gas supplying pipe fitted to a vacuum vessel in right and left directions with respect to gas introducing end part through a bell crank working with dead weight of a ladle. CONSTITUTION:In the vacuum vessel 7, 8, the ladle 4 is set to a ladle stand 5 and gas is introduced from the gas supplying pipe 1 connected with a porous plug 3 to refine the molten steel therein. In an attaching/detaching device for the above gas supplying pipe 1, an elastic flange 18 at the end part of gas supplying pipe 1 and a hose metal tool 16 with a flange at the gas introducing pipe 10 side are fitted attachably/detachably in right and left directions. Further, the above elastic flange 18 is fitted to be slightly flexible and inclinable to side face of the ladle 4. Further, the above hose metallic tool 16 is shifted in right and left directions by working the bell crank 15 attaching a return spring 14 with the dead weight of ladle 4 through a crank engaging part 21 at the bottom part in the ladle 4. Further, at the end part of gas introducing pipe 1, arrangement of a check valve 17 energized with a spring 27 is desirable. By this method, the development of clogging caused by stickness of splash 11, etc., in the gas introducing pipe 1 can be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a ladle for automatically connecting and separating gas supply pipes of a vacuum ladle degassing device used for vacuum degassing refining of molten steel. This invention relates to a gas supply pipe attachment/detachment device.

[Conventional technology]

As shown in FIG. 3, a vacuum ladle degassing device usually includes a ladle 4 equipped with a porous plug 3 at the bottom inside upper and lower vacuum vessels 7.8, and the inside of the ladle 4 is It is designed to refine molten steel, and is placed on a ladle stand 5 provided in a lower vacuum vessel 8. At the time of this mounting or removal, the gas supply pipe 1 and the gas introduction pipe 10 to the porous plug 3 must be connected or disconnected. Conventionally, this gas supply pipe was disconnected using gas connector 2.
was operated manually, but since this work had to be done near the ladle 4 where molten steel was present, it was dangerous and difficult to work under high temperature conditions, and the gas connector 2 itself was exposed to the radiant heat of the molten steel. This caused damage due to the scattering of Splash 11 and caused malfunctions.

Therefore, in order to deal with such problems, for example, (
1) In Japanese Patent Publication No. 60-56577, as shown in FIG.
The gas supply pipe 4, which is attached to the end thereof, and the introduction pipe 5 whose end is open and fixed to the top plate 15 of the cylinder 7 directly below the pipe 4 are engaged in a vertical direction. A spring 12 is interposed between the cylinder 7 and a casing 11 that loosely fits into the cylinder 7 from the outside. By pressing down together, the gas supply pipe 4 and the introduction pipe 5 are automatically connected (communicated). Others (2
) Utility Model Application No. 60-186946, Utility Model Application No. 56-4555
In No. 7 and the like, the lower gas introduction pipe end opposite to the upper gas supply pipe end is arranged vertically upward.

[Problem to be solved by the invention]

However, in the conventional example shown in (1) above,
Since the introduction pipe 5 opens vertically upward, the ladle 2
Splash (indicated by reference numeral 11 in FIG. 3), metal, dust, etc. that are scattered around the pipe when it goes up and down falls and enters the pipe, causing clogging of the introduction pipe 5 after a certain period of operation. Splash and the like also enter the gap between the cylinder 7 and casing 11, which are loosely fitted into each other, and the vertical sliding between the two cylinders 7 and 11 becomes unsmooth, causing the bracket 6 to face upward when the ladle 2 is set. A load will be applied. When this is repeated, the bracket 6 is pushed upward and tilted with respect to the top plate 15 of the cylinder, making it easy for gas leakage to occur at the sealing portion. Furthermore, dust, metal, etc. adhere to the gasket 16, and gas leakage is also likely to occur. Furthermore, with this structure, it is difficult to attach a cover to prevent splashes and the like from falling.

Also, in the conventional example 2) above, the situation where the problem occurs is (
This is the same as the conventional example 1).

The present invention has been made in view of such conventional problems, and by configuring the gas supply end and the gas introduction pipe end to be moved toward and away from each other in the left-right direction via a bell crank, The purpose is to solve the above problems.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a gas supply pipe attachment/detachment device for refining molten steel in the ladle by installing a ladle equipped with a porous plug on a ladle stand, in which one end is connected to the porous plug. and a gas supply pipe end fixed to the side of the ladle via a ballistic flange that is bendable and slightly tiltable, and a flanged hose facing the end so that it can fit with the ballistic flange. A return spring is interposed between the flanged hose fitting and the crank engaging part of the ladle, which operates when the gas introduction pipe equipped with the fitting is placed in or removed from the ladle stand in the vacuum container. Provided is a device for attaching and detaching a gas supply pipe to a ladle, which is configured to be connected or separated by a bell crank having a
Furthermore, the end of the gas supply pipe fixed via a ballistic flange and the end of the gas introduction pipe with a flanged hose fitting are
Preferably, check valves are provided, each biased in opposite directions by a spring.

[Effect]

Since the present invention has the above-described configuration, when the ladle is placed on the ladle stand, the members such as the flange that fixed the end of the gas supply pipe attached to the ladle are placed at the same height on the left and right sides. This is a position that is lower by, for example, D2 than the opposite end of the gas introduction pipe and the flanged hose fitting to which this is attached.

At this time, the end of the horizontal arm 15a of the bell crank interposed between the crank engaging part of the ladle and the flanged hose fitting is also pushed down by D2 by the crank engaging part, so the end of the vertical arm 15b of the bell crank is pushed down by the amount D2. For example, if the flanged hose fitting is engaged with the flanged hose fitting, it approaches the end of the gas supply pipe by a distance corresponding to the flanged hose fitting beam. Therefore, first, the distance D1 between the ends of both pipes is set to D
If +<Di, the end beams of both tubes, -D, = l'
) 3, the springs in each check valve mechanism are compressed and brought into pressure contact. In addition, the flanged hose fitting that engages with the bell crank with a pin comes into contact with the flange at the end of the gas supply pipe at a slight angle due to the rotation of the bell crank, but the flexible flange portion is configured to be slightly tiltable. Since the ends of both tubes are in close contact with each other, no gas leakage occurs.

Furthermore, in the present invention, check valve mechanisms are provided on the flanges of the respective tracks to which the ends of both pipes are attached, so that splashes and the like are difficult to enter into both pipes.

Furthermore, since both flanges face each other in the left-right direction, it is structurally easy to provide a splash fall prevention cover in the vacuum vessel directly above both flanges.

〔Example〕

Hereinafter, the present invention will be explained based on the drawings. FIGS. 1 and 2 are diagrams showing an embodiment of the present invention.

However, in the drawings, the same parts as in the conventional example are designated by the same reference numerals, and redundant explanation will be omitted.

In the figure, a gas supply pipe 1, which is a flexible hose, has one end connected to a porous plug 3 provided at the bottom of a ladle 4, and the other end fixed to a ballistic flange 18 via a sliding cylinder 29°30. has been done.

The ballistic flange 18 is fixed to an outer sliding cylinder 29, and the cylinder 29 is loosely fitted into an inner sliding cylinder 30, and the circumferential corners of the respective alligator portions 29a, 30a of each cylinder 29, 30 are chamfered. Since it is rounded and has a slight gap between it and the cylindrical portion, the ballistic flange 18 can be slightly tilted with respect to the central axis X (FIG. 2). Further, a compression spring 28 is interposed between the elastic flange 18 and the inner cylinder 30, so that it can bend and expand with respect to the vacuum container 4.

A check valve 17 is provided at a fixed portion of the elastic flange 18 at the end of the gas supply pipe 1 so as to be biased outward by a compression spring 27, and closes the open end of the gas supply pipe 1. 25 is an O-ring that maintains airtightness when closed.

On the other hand, the flanged hose fitting 16 has a ballistic flange 18.
It is pivotally attached to the end of the vertical arm 15b of the bell crank 15 so as to share the central axis X of the bell crank 15, and holds a gas introduction pipe 10 made of a flexible hose. Also, a check valve 17 and an O-ring 25 are provided at the fixed portion of the gas introduction pipe end of the flange 19 of the flanged hose fitting 16 in the same way as in the ballistic flange 18. A compression spring 27 is provided, and the check valve 17 is biased outward to close the open end of the gas introduction pipe 10.

Reference numeral 20 denotes a gasket, which is provided to maintain airtightness between the flanges 19 and 18 when they are pressed into contact with each other.

The bell crank 15 is rotatably held in a bin 24 provided on a crank bracket 22, and the vertical arm 15b pivotally supports a hose fitting 16, and the tip of the horizontal arm 15a is connected to a crank provided below the ladle 4. The portion 21 and the bell crank 15 are adapted to engage when they start operating. The bell crank position is set so that the distance between the ballistic flange 18 and the boss flange 19 is maintained at Dl immediately before this engagement. 31 is a stopper for regulating the position of the vertical arm 15b.

Next, the operation will be explained.

Now, when the ladle 4 is placed on the ladle stand 5, the ballistic flange 18 attached to the other end of the gas supply pipe 1 is lowered by D2 from its axis X, and D2 > 1.
), and the relationship is D2-DI-D3, so when the crank engaging part 21 pushes down the horizontal arm 15a by D2, the vertical arm 15b moves the hose fitting 16 to the left in the figure, and both flanges 18 .19 are pressed together through the packing 20 and D I=O, the check valve 17 is pushed into each flange 18 and 19 by D3 against the elasticity of the compression spring 27, resulting in a gap through which the gas passes. The gas introduction pipe 10 and the gas supply pipe 1 communicate with each other, and gas (Ar gas, etc.) is blown into the ladle 4 from the porous plug 3.

Here, the relationship among D+, Dz, and D3 may be set in advance based on the angle formed by the vertical and horizontal arms 15a and 15b of the bell crank 15, their respective lengths, and the arrangement position of the bell crank. In addition, since the tip of the vertical arm 15b of the bell crank 15 moves in an arc shape, the flange 1
9 is slightly inclined, but since the amount of movement is small, the angle of inclination is also small. Therefore, the slight inclination of the ballistic flange 18 in pressure contact with the flange 19 makes the outer and inner cylinders 29
．． 30 is loosely fitted, and each crocodile part 29a
, 30a can be followed by rounding of the ends.

Next, when the ladle 4 is lifted, the vertical arm 1 of the bell crank
5b is returned to the position of the stone 831 by the tension spring 14, creating a gap between the two flanges 18 and 19, and at the same time the check valve 17 is urged outward by the compression spring 27 to close the gas supply pipe 1 and the gas Each open end of the introduction tube 10 is instantly closed and returns to its original state.

Note that the check valve prevents the intrusion of dust such as splash at the open ends of both gas pipes, but in the apparatus of the present invention, a dust-proof cover as shown at 13 in FIG. 2 may be provided inside the vacuum vessel 8. can.

Although the present embodiment has been described above with respect to a vacuum ladle degassing device, it can also be applied to other gas supplies, such as an argon bubbling stand or a stand for a molten steel heating device.

〔Effect of the invention〕

As explained above, according to the present invention, (1) Because this device is a horizontal type, unlike the conventional vertical type, and because a check valve is provided, splashes, metal, etc. do not enter the opening end of each gas pipe. , it became possible to automatically attach and detach gas pipes without clogging the pipes. (2) Since the power to operate the device comes from the ladle's own weight, a drive source such as a hydraulic cylinder is not required. (3) The check valve mechanism prevents dust from entering the pipe due to residual gas pressure even when the ladle is removed. (4)
Effects such as being widely applicable to ladle stands of other equipment can be obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view of a vacuum ladle degassing device equipped with an embodiment according to the present invention, Fig. 2 is a detailed view of the embodiment in Fig. 1, and Fig. 3 is a sectional view of the vacuum ladle degassing device. FIG. 4 is a sectional view of a conventional example. ■... Gas supply pipe, 3... Porous plug, 4... Ladle, 5... Ladle stand, 7.8...・Vacuum container, 10...Gas introduction pipe, 14...Return spring. 15...bell crank, 16...hose fitting with flange, 17...check valve,
18. Old... Bullet flange, 21... Crank engaging part, 26. Old... Sprig.

Claims (1)

[Claims] (1) In a gas supply pipe attachment/detachment device for installing a ladle equipped with a porous plug on a ladle stand and refining molten steel in the ladle, one end is connected to the porous plug and the other end is bent to the side of the ladle. A gas supply pipe end fixed via a ballistic flange that is freely and slightly tiltable, and a gas introduction pipe provided with a flanged hose fitting facing the ballistic flange at the end so as to be able to match with the ballistic flange, A bell crank with a return spring interposed between the flanged hose fitting and the crank engaging part of the ladle, which operates when the ladle is placed on or removed from the ladle stand inside the vacuum container, connects or removes the ladle. A device for attaching and detaching a gas supply pipe to a ladle, characterized in that the gas supply pipe is separated from the ladle. (2) The first aspect of the present invention includes check valves biased in opposite directions by springs at the end of the gas supply pipe fixed via a ballistic flange and at the end of the gas introduction pipe having a flanged hose fitting. Gas supply pipe attachment/detachment device to the ladle as described in .