JPH0159071B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for dispensing molten metal from a molten metal container, such as a ladle or tundish, and a sliding valve for use in carrying out this method. As used in this application, the term "molten metal" refers to steel, iron,
It refers not only to molten materials such as aluminum and brass, but also to materials such as molten glass.

Prior art in the field of this invention is U.S. Pat.
No. 311902, No. 1507852, No. 3436023 and No.
It is roughly described in No. 3454201. US Patent No.
No. 3,352,465 and its reissue patent No. Re27,237 disclose a series of valve bodies made of refractory material that are spring-loaded against a fixed top plate. More recently published U.S. Pat. No. 3,866,806 discloses a method of throttling that uses a check cylinder to stop the valve body just short of its full stroke.

However, the above-mentioned prior art has the disadvantage that the flow rate of the molten metal cannot be throttled and adjusted independently of the emergency closing operation. Such throttling operations are particularly desirable when pouring aluminum killed steel into continuous casting equipment. Aluminum oxide produced as a result of the deoxidation process adheres to the sidewalls of the pouring opening and associated nozzle, eventually causing hole clogging. Therefore, it is necessary to be able to replace sliding valves and nozzles in continuous casting equipment. Such an exchange is described in U.S. Patent No. 3,352,465 (Re27237).
This is accomplished by replacing the clogged valve plate with a new one while closing the opening in the fixed plate with a non-perforated plate, as disclosed in . In other words, the present invention allows the flow of molten metal to be throttled during continuous casting while allowing for replacement of the sliding valve when necessary as a result of hole clogging or erosion during the casting operation. These tasks can be accomplished independently by separate mechanisms provided in the device of the present invention.

According to the present invention, in the method of controlling the amount of molten metal poured out by a sliding valve plate slidably provided at the lower part of an upper plate having a discharge port attached to the lower part of the molten metal container, A plurality of valve plates, at least one of which has an opening, a sliding valve plate;
Molten metal pouring characterized in that the plurality of sliding valve plates are sequentially moved to the lower part of the upper plate, and the sliding valve plates are movable in a direction substantially perpendicular to the direction of movement to adjust the amount of molten metal discharged. A method is provided.

According to the invention, there is also provided a top plate arranged below the molten metal container and having an orifice communicating with a discharge opening in the bottom of said container, and a plurality of sliding valve plates having at least one dispensing opening. a device for supporting the sliding valve plate relative to the top plate; and moving the sliding valve plate so that one of the sliding valve plates is placed directly below the top plate. a first drive and said sliding valve along a direction perpendicular to the movement of said first drive for removing said sliding valve plate directly below said top plate from its normal fully open position and restricting the pour flow; A sliding valve for a molten metal container is provided, characterized in that it has a second drive device that moves a plate.

Next, the present invention will be described in more detail by way of examples with reference to the accompanying drawings.

1 and 2 show a tundish 1 with a refractory lining 2. FIG. Attached to the bottom of the tundish is a fixed mounting plate 3 which holds a refractory top plate 4 in a fixed position with respect to this mounting plate. A support rod 5 is attached to the mounting plate 3 and slidably supports the slide valve support frame 6. The support frame 6 is provided with a sliding valve support track 7, which is shown in detail in FIG. A valve replacement cylinder 8 is connected to the sliding valve support frame 6. The sliding valve plate is inserted from position 11 to position 12 in FIG. 1, and then cylinder 8 forces it into the operating position 13 and at the same time pushes the used sliding valve plate from position 13 to position 14. The sliding valve plate includes a blind plate with no holes (for closing) as shown at 12, and one with a discharge opening as shown at 13 and 14. As shown in Fig. 1, this device has an immersion pouring pipe or nozzle
It is equipped with 6. However, it is also possible to work without a submerged nozzle. The submerged nozzle 16 is suspended from a holder 15 which is supported on the support rail 10 as shown in detail in FIG. The support rail 10 is held by a submerged nozzle support frame 9 attached to the lower part of the sliding valve support frame 6.

As can be seen in FIG. 2, the support rails 7 and 10 are pivotally connected to the respective support frames 6 and 9, respectively, to move the sliding valve plate 13 relative to the upper plate 4 and
Place the submerged nozzle holder 15 against the sliding valve plate 13,
It is loaded by a spring to elastically press it.

FIG. 2 shows how the throttling is performed. In other words, as the sliding valve support frame 6 is shifted to the right, the centers of the opening in the upper plate 4 and the opening in the sliding valve plate 13 are shifted and misaligned, thus restricting the flow of hot water. There is. The sliding valve support frame 6 slides on the support rod 5 and is moved in this example by a hydraulic throttle cylinder 17, but it could also be moved by a manual or electric lever or screw. In the embodiment shown in FIG. 2, since the submerged nozzle support frame 9 is fixed to the sliding valve support frame 6,
The submerged nozzle holder 15 and the submerged nozzle 16 are aligned with the sliding valve plate 13 and are integrally shifted to the right with respect to the upper plate 4.

In the embodiment shown in FIG. 3, the submerged nozzle support frame 9 is fixedly attached to the mounting plate 3, so that the cylinder 17 supports the sliding valve support frame 6 and the sliding valve plate 13 as shown in the figure. When moved, the submerged nozzle support frame 9, the submerged nozzle holder 15, and the submerged nozzle 16 remain aligned with the upper plate 4.

FIG. 4 shows a ladle 18 with a refractory lining 19. Attached to the ladle is a fixed mounting plate 20 which holds a refractory top plate 21 in a fixed position relative thereto. In addition, fixed mounting plate 2
As shown in FIG. 5, the slide valve support frame 27 is held by a flanged jib 28. Sliding valve 25
A sliding valve support 24 supporting the valve is slidably mounted on the support frame 27.

In the position shown in FIG. 4, the operating linkage 23 actuated by the operating cylinder 22 moves the sliding valve support 24 and the sliding valve 25 to the right until it hits a stopper provided on the support frame 27. Pull. This position is the normal fully open position, but as shown in the figure, the throttle cylinder 26 connected between the main body of the ladle 18 and the support frame 27 is
Since the entire body is moved to the right by a distance corresponding to about 1/3 of the width of the opening in the upper plate 21, the flow rate passing through the opening is restricted. Further, the aperture operation can be similarly performed by moving the support frame 27 to the left. Which of these throttling operation methods is selected depends on whether it is desirable to perform the throttling operation on the front or rear surface of the slide valve. The slide valve can be quickly closed by pushing and holding the operation cylinder 22 without operating the throttle cylinder 26.

In FIG. 5, the flanged jib 28 is screwed to the mounting plate 20 by cap screws 29.
The flange portion of the jib 28 engages the flange portion of the support frame 27, allowing the required sliding movement of the support frame 27 and supporting it in a defined vertical position. A plurality of stops are added to the jib 28 to limit the travel of the support frame 27.

In FIGS. 6 to 9, parts corresponding to those shown in FIGS. 1 and 2 are indicated by the same reference numerals with dashes attached, such as tundish 1'. . A refractory lining 2' is attached to the inside of the tundish 1', and a mounting plate 3' is located below it. A top plate 4' is placed directly below the discharge opening of the tundish 1'. A frame 6' surrounds the upper plate 4', and a sliding valve support rail 7' is attached inside the frame 6', and a sliding valve plate 13' is attached to the driving cylinder 8' (see Fig. 9) along the rail. ) is driven by

The nozzle support frame 9' is located below the sliding valve support frame 6' and has a support track 10' on which a nozzle holder 15' is attached. The nozzle holder 15', like the upper plate 4' and the sliding valve plate, is housed in a metal case. Nozzle 16' extends downwardly from retainer 15'.

The throttle cylinder 17' drives a transverse link 30 which is pivotally connected to a plurality of crank arms 31 attached to a crankshaft 32. A plurality of short crank arms 33 are also attached to the shaft 32 and further pivotally connected to a plurality of yokes 34. The yoke 34 is provided with opposing push rods 35 which act to move the slide valve support rail 7' laterally for throttling operations.

The spring-loaded push rod 37, which is pressed down by the spring 36', pushes the swinging arm 38 mounted on the pivot 39' to move the nozzle holder 15' against the sliding valve plate 13' and against the sliding valve. Plate 13' to upper plate 4'
Acts as if pressing against.

As shown in FIGS. 7 and 8, the sliding valve plate 1
The discharge opening 3' is elongated in the aperture direction. This shape is highly desirable in order to maximize the opening to avoid any clogging at the end of pouring, and conversely to maximize the opening in the early stages of pouring to avoid any clogging. It is highly desirable to be relatively small. The elongated orifice shown in FIG. 7 is oval in shape.
As a variant, oval shapes are also used. Under conditions of maximum aperture, the planar shape of the discharge opening is preferably approximately circular, but approaches the shape shown in FIG. 7 as the aperture is opened. This shape is covered and deformed only depending on the degree of pore clogging.

In this way maximum throttling action is achieved while keeping the flow of hot water undisturbed. Furthermore, the idea of the present invention also includes the use of a perforated plate having a plurality of openings in which all oval openings have the same major axis and differ only in minor axis. Since the longitudinal length of the aperture is a function that determines the total stroke of the aperture mechanism, the maximum usable aperture ratio is the same for all apertures of different sizes. In the embodiment shown in FIGS. 6-9, the stroke of the diaphragm mechanism is half the length of the major axis of the aperture. The elongated opening makes it possible to use sliding valve plates with varying opening areas in mechanisms with a constant throttle stroke, while also dispersing the hot water flow and creating a high degree of erosion in the area below the throttle section. This has the effect of making it possible to avoid such excessive aperture.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the bottom of a tundish to which a sliding valve according to an embodiment of the present invention is attached, and Fig. 2 is an enlarged sectional view taken along line 2-2 of Fig. 1, showing the sliding valve plate. FIG. 3 is a cross-sectional view similar to FIG. 2 but shows another embodiment; FIG. 4 is a diagram showing the nozzle being offset from the center; 5 is an enlarged sectional view taken along the line 5-5 in FIG. 4, and FIG. 6 is a portion of still another embodiment of the present invention. FIG. 7 is a plan view of the opening of the sliding valve plate in FIG. 6, and FIG. 8 is a sectional view taken along line 8-8 in FIG. 7. 9 is a scaled plan view showing the valve of the embodiment shown in FIG. 6 removed from the tundish. DESCRIPTION OF SYMBOLS 1...Tandateshitsu, 2,19...Fireproof lining, 3,20...Mounting plate, 4,21...Top plate, 5...Support rod, 6,27...Sliding valve support frame,
7, 7'...Support rail, 8...Cylinder, 9...
Nozzle support frame, 10...Support rail, 12, 13,
14...Sliding valve plate, 15...Holder, 16,1
6'... Immersion nozzle, 17, 17', 26... Cylinder, 18... Ladle, 22... Cylinder, 23...
... Link mechanism, 24 ... Support body, 25 ... Sliding valve, 28 ... Jib, 29 ... Holding screw, 30 ...
Horizontal link, 31... Crank arm, 32... Crank shaft, 33... Short crank arm, 34... Yoke, 35... Push rod, 36, 36'... Spring, 37
...Push rod with spring, 38...Swing arm.

Claims (1)

[Scope of Claims] 1. A plurality of sliding valve plates, at least one of which has an opening, are sequentially moved along a support frame with respect to the pouring opening of the molten metal container by a first driving device to discharge the molten metal. In the pouring method for adjusting the amount of molten metal discharged from the container, the first driving device 8,
A second drive 17, 17', 26, which can be operated independently from the support frames 6, 6', 8', 23,
27 to further adjust the positions of the sliding valve plates 13, 13', and 25, which are in the operating position relative to the pouring opening, to restrict the flow of the molten metal between the valve fully open state and the valve fully closed state. A pouring method characterized by the following. 2. To compensate for hole clogging that occurs during pouring,
2. The pouring method according to claim 1, wherein the sliding valve plate is first moved to a maximum throttle position, and then the valve plate is moved so as to gradually open the throttle. 3. In order to compensate for the erosion occurring during pouring, the sliding valve plate is first moved to the maximum opening position and then progressively towards the maximum throttle position. Pouring method described in Section 1. 4. In order to adjust the flow rate of the pouring metal from the molten metal container, first move the sliding valve plate to an intermediate position between the maximum opening position and the maximum throttle position, and then move it in the direction of narrowing the valve more or opening it more widely. A pouring method according to claim 1, characterized in that: 5. an upper plate having an orifice communicating with the pouring opening of the molten metal container; a support frame for guiding a plurality of sliding valve plates so that they can be moved sequentially to and from the operating position relative to the upper plate; a first drive device for moving the sliding valve plate along the support frame, at least one of the sliding valve plates having an opening that can mate with an orifice in the upper plate; In the container sliding valve, the support frames 6, 6', 27
are mounted so as to be movable with respect to the upper plate, and are operable independently of the first drive devices 8, 8', 23; second drive devices 17, 17';
26 is mounted on the support frame and supported by the support frame in order to adjust the relative position of the opening of the sliding valve plate and the orifice of the upper plate, and to throttle the flow of molten metal between a fully open valve state and a fully closed valve state. A slide valve for a molten metal container, characterized in that the slide valve is connected to the support frame so as to move the slide valve plate in the operating position. 6. The sliding valve plate 13 is slidably mounted in the support frame 6, and the second driving device adjusts the position of the opening of the sliding valve plate with respect to the orifice of the upper plate, and controls the flow of the molten metal. A claim characterized in that the fluid cylinder 17 is connected to the support frame 6 so as to move the support frame 6 laterally in order to throttle the flow between a fully open valve state and a fully closed valve state. A sliding valve for a molten metal container according to item 5. 7. The sliding valve plate 25 is slidably mounted within the support frame 27, and the second drive device adjusts the position of the opening of the sliding valve plate with respect to the orifice of the upper plate, and controls the flow of the molten metal. In order to throttle the flow between the valve fully open state and the valve fully closed state, the support frame 27 is moved in the direction of movement of the sliding valve plate.
6. A sliding valve for a molten metal container according to claim 5, characterized in that it has a fluid cylinder 26 connected to a molten metal container 7. 8. The support frame 6' has rails 7' spaced apart on both sides to support the sliding valve plate 13', and the second drive device connects the rails 7' and the rails 7' to support the sliding valve plate 13'. A fluid cylinder 1 connected via a crank 31 to a crankshaft 32 for laterally moving a supported sliding valve plate 13'.
7', and the crankshaft 32 via the crank 33.
The sliding valve for a molten metal container according to claim 5, characterized in that it has a yoke 34 connected to the yoke 34 and an opposing push rod 35 connected to the yoke 34.