JP2000141024A - Method for restricting slide plate in slide valve for controlling flow-out of molten metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the occurrence of crack on a slide plate in a slide valve and to improve the durability of the slide plate. SOLUTION: In the slide valve which has plate bricks arranged at the pouring outlet part in molten metal treating equipment and provided with a molten metal through-hole 5a for controlling the flow-out of the molten metal and adjusting the opening degree of the molten metal through-hole by sliding one of these plate bricks to control the flow-out of the molten metal, the slide plate 5 for sliding, is fixed by pressing the whole or a part of range except the side surface corresponding to the molten metal through-hole 5a on the side surface parts 5d in the longitudinal direction in a slide frame 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide valve for controlling molten metal outflow, and to a method for restraining the slide plate.

[0002]

2. Description of the Related Art A slide valve for controlling the outflow and the amount of outflow of molten metal is provided at a molten metal pouring port in a continuous casting facility or the like.

This slide valve is fixed to a slide valve device main body 2 fixed to the bottom of a tundish or ladle 1 as molten steel processing equipment, as shown in FIG. Storage section 4 for storing plate 3 (made of brick) and slide plate 5 overlapping this
(Made of brick) is provided, and the slide frame 6 is provided with a cylinder 7 supported outside the apparatus main body 2.
The slide operation is performed to change the alignment position of the molten metal passage holes 3a and 5a formed in the fixed plate 3 and the slide plate 5, thereby stopping the outflow and adjusting the outflow amount.

[0004] As a method of fixing the slide plate 5, conventionally, as shown in a plan view of FIG.
Are formed at the corners at both ends of each of the four sides, and these four inclined surfaces 5b, 5b,... Are tightened and fixed to the slide frame 6 (prior art 1, Japanese Patent Publication No. 4-79746). , Two surfaces 5c at both ends in the longitudinal direction of the slide plate 5,
5c is fixed by tightening (prior art 2, Tokiohei 1-)
No. 501606), a method in which the slide plate 5 is fixed on the four end faces 5d, 5d in addition to the both end faces 5c, 5c in the longitudinal direction (conventional technology 3, Jpn.
966), and in addition to the four inclined surfaces 5b, 5b,.
It is based on any of the methods of fixing on six surfaces for convenience of 5d (Prior Art 4, Utility Model Registration Publication No. 2563881).

[0005]

In the fixing methods of the prior arts 1 to 3, cracks A to F are generated starting from the molten metal passage hole 5a as shown in FIG. Once such a crack is generated, the crack expands during operation, impairing the function as a slide plate, and shortening the service life.

[0006] When the test in the actual machine and the analysis by the computer simulation were repeatedly performed, these cracks were found to be generated when the molten metal rapidly passed through the molten metal passage hole 5a as shown in FIG. The tensile stress a to the longitudinal front and rear portions of the slide plate 5 with respect to
f (corresponding to the cracks AF) is considered to cause the cracks AF. This cracking occurs when the tensile stress exceeds the material strength. In other words, the reason why the generation of cracks could not be suppressed in the above-described conventional technology is considered to be that even if the slide plate was restrained, a load sufficient to counter the tensile stress could not be effectively applied to the slide plate. For example, in the above-mentioned prior art 2, a guide is provided on the side surface of the plate, but there is no load applying mechanism, and the above-mentioned stress cannot be suppressed.

The slide plate 5 among the cracks A to F
Zone S for stopping outflow of molten metal
The crack E that occurs over the maximum has the most adverse effect.

[0008] In view of the above, an attempt was made to suppress the generation of the tensile stresses a to f by restraining the entire area on both sides in the longitudinal direction of the slide plate 5 and applying pressure (corresponding to the above-mentioned prior art 4). Although the tensile stresses a to f shown in FIG. 7 do not occur, the molten metal passage hole 5a is deformed so as to extend in the longitudinal direction of the slide plate 5 as shown by a dotted line in FIG. It was found that tensile stresses g, g were generated on both sides in the longitudinal direction, and thereby cracks G, G were generated in the width direction of the slide plate 5.

[0009]

Means for Solving the Problems Accordingly, the present inventors have proposed:
By pressing and fixing the side portions in the other range except the side corresponding to the molten metal passage hole on both sides in the longitudinal direction of the slide plate, tensile stress is not generated on both longitudinal sides of the molten metal passage hole, and In the stop zone, a compressive stress was generated in the width direction, and the generation of cracks in the direction of the stop zone in FIG. 6 was eliminated. In this case, in addition to the side surfaces in the above range, the inclined surfaces at both corners in the longitudinal direction may be restrained and fixed together. In the four-plane constraint using the inclined surfaces, a load of 1 to 4 t is applied to each of the two inclined surfaces at one end in the longitudinal direction according to the shape. In the present invention, a load of 1.5 t or more is applied to one side surface. It was confirmed that the expected effect was obtained by applying the load.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.

The slide plate 5 is intended for the one shown in FIG. 5, and has side portions 5d of a required length on both sides in the longitudinal direction as in FIG.
The corners where 5d intersects the longitudinal end surfaces 5c, 5c are cut off obliquely to form inclined surfaces 5b, 5b and 5'b, 5'b. A molten metal passage hole 5a formed of a round hole is opened at the center position in the width direction of the stop zone S.
It has been. Although not shown, the periphery of the slide plate 5 is reinforced by being surrounded by a shrink fit.

The slide plate 5 is moved to a slide frame 10
As shown in FIG. 1, the end of the slide plate 5 on the side of the molten metal passage hole 5a is provided with the inclined surfaces 5b, 5b on both sides of the slide plate 5, as shown in FIG. The pressing pieces 13, 13 movable forward and backward by a cylinder 12 supported by a slide frame 10 are pressed against the inclined surfaces 5 ′ b, 5 ′ b on the other end side and pressed. The cylinder 14 supported by the slide frame 10 covers substantially the entire area of the side surfaces 5d except for the side surface corresponding to the molten metal passage hole 5a.
The pressing pieces 15, 15 which can be moved forward and backward by the abutment 14 are brought into contact with each other and are restrained by applying the above-mentioned load. When one type of slide plate 5 is used, one pressing piece 15 may be fixed, and only the other pressing piece 15 may be moved to apply pressure. However, the load point W (the intersection point between the center line of the cylinder 14 and the center line in the longitudinal direction of the slide plate 5) by the cylinder 14 is a position separated from the edge θ of the molten metal passage hole 5a on the stop zone S side by 10 to 150 mm. Is done.

When the distance between the load points W is preferably 10 to 100 mm, more preferably 20 to 70 mm, the generation of tensile stress can be suppressed with an appropriate load.

If the separation distance is less than 10 mm, as shown in FIG. 8, the molten metal passage hole 5a tends to be deformed so as to extend in the longitudinal direction of the slide plate 5 as indicated by a dotted line. , Tensile stresses g, g are likely to be generated on both sides in the longitudinal direction. Thereby, cracks G in the width direction of the slide plate 5 are easily generated.

If the distance exceeds 150 mm, it is difficult to obtain the effect of suppressing the generation of tensile stress around the molten metal passage hole 5a even when a load is applied.

It is to be noted that the pressing piece 15 is provided with a molten metal passage hole 5a.
It is not preferable to apply the pressure to the range corresponding to the above, since the passage hole 5a is likely to be deformed, and a tensile stress is generated to easily cause a crack. Further, the width of the pressing piece 15 is preferably less than twice the separation distance, but is not limited to this range as long as the through hole 5a is not deformed.

It is preferable that the pressing load applied to the side surface portion 5d excluding the area corresponding to the molten metal passage hole 5a is 1.5 t or more, and more preferably, the tensile stress of the passage hole 5a by a load of 2 to 3 t. (B, e in FIG. 7) should be suppressed.

When the above-mentioned restrained state is schematically illustrated, as shown in FIG.
The range is indicated by b and c.

The inclined surface 5b on the molten metal passage hole 5a side,
Even when the end face 5c is restrained without restraining the end face 5b, as shown in FIG. 3, arrows A, B, and C are provided, and the side face in the range corresponding to the molten metal passage hole 5a is not pressed as in FIG.

In addition to the load on the load point W, the load may be applied to the side surface 5d opposite to the stop zone S by adding a cylinder 14 '.

In the above case, even when the load is applied to the stop zone S side and the opposite side, each of the cylinders 14,
The intersection point between the center line of the pressing by 14 'and the center line in the longitudinal direction of the slide plate 5 is set as the load point W.

The pressing piece 15 may be mounted asymmetrically with respect to the axis of the cylinder 14 as shown in FIG. 1B. In this case, the load point W is determined by the axis of the cylinder 14 and the length of the slide plate 5. The intersection with the direction center line.

Further, when a load is also applied to the side surface 5d opposite to the stop zone S, only one cylinder 14 is used as shown in FIG.
The points a and 15b may be set as two points to be brought into contact with the side surface part 5d. In this case, each load point W is
The intersection of the center line of 5a, 15b and the center line of the slide plate 5 in the longitudinal direction is formed.

The means for loading the slide plate 5 is not limited to the means using the cylinders 12 and 14, but may be a screw mechanism such as a bolt.

When a guide is provided for positioning the slide plate 5, it may be provided on the side surface corresponding to the molten metal passage hole 5a. The guide in this case may be fixed or movable so as to correspond to a slide plate of a plurality of sizes. However, the load by this guide needs to be less than 0.5 ton in the sense that the molten metal passage hole 5a is not deformed.

With the above-described restraining method, the longitudinal direction around the molten metal passage hole 5a of the slide plate 5,
No crack is generated in any of the width directions, so that the function of the stop zone S of the slide plate 5 is not lost.

Next, the restraining method according to the present invention and the conventional inclination 4
The result of the comparison test of the service life with the restraining method by the surface is shown.

[0028]

[Table 1] [Note] Crack index: Evaluation of crack (E) in FIG. 6 for a plate having a service life of 6 times or more Crack index 4 (Discontinued when less than 6 ch) Crack index 3 (Discontinued) In view of the above test results, according to the present invention, the generation of cracks (E) is suppressed by at least 60% or more in comparison with the conventional one using the four-sided restraint (corresponding to the prior art 3), and the number of service life is reduced. Life extension of up to 50% was confirmed.

[0029]

As described above, according to the present invention, the entire or a part of the slide plate except for the side surface corresponding to the molten metal passage hole on the longitudinal side of the slide frame is fixed in the slide frame. By doing so, the generation of stress around the molten metal passage hole is suppressed, the occurrence of cracks originating from the passage holes is prevented, and the occurrence of defects such as steel leakage and stop failure due to the occurrence of cracks is ensured. And the useful life of the slide plate can be significantly extended.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, in which (A) is a plan view,
(B), (C) is a partial plan view showing a modification of the pressing means.

FIG. 2 is a schematic diagram showing the action of a pressing force in a restraining method in which the present invention is a six-face restraint.

FIG. 3 is a schematic diagram showing an action of a pressing force when the five-face constraint is used.

FIG. 4 is a cross-sectional view of a slide valve device exemplified as an object to which the present invention is applied.

FIG. 5 is a plan view of a slide plate.

FIG. 6 is an explanatory view showing a state of occurrence of cracks in a conventional technique.

FIG. 7 is an explanatory diagram showing a state of occurrence of internal stress.

FIG. 8 is an explanatory diagram showing the state of occurrence of internal stress and cracks due to side constraint.

[Explanation of symbols]

 Reference Signs List 1 molten metal container 2 slide valve device main body 3 fixed plate 5 slide plate 5a molten metal passage hole 5b inclined surface 5c end surface 5d side surface portion 6,10 slide frame 11 contact portion 13,15 pressing piece S stop zone W load point

Continued on the front page (72) Inventor Michinori Yoshikawa 2-2-1 Otemachi, Chiyoda-ku, Tokyo Shinagawa Kawabashi Brick Co., Ltd. F-term (reference) 4E014 MA01 MA05 MA07 MA11 MA26

Claims (3)

[Claims] 1. A plate brick provided at a spout of a molten metal treatment facility and having a molten metal passage hole for controlling the outflow of molten metal, one of which is slid to slide the molten metal passage hole. In the slide valve which controls the outflow of the molten metal by adjusting the opening degree of the molten metal, the slide plate for the slide is formed in a range other than a side surface corresponding to the molten metal passage hole of a longitudinal side surface portion in the slide frame. A method for restraining a slide valve of a molten metal outflow control slide valve, wherein the whole or a part of the slide valve is pressurized and fixed. 2. A slide plate restraint for a slide valve for controlling molten metal outflow according to claim 1, wherein the load point caused by the pressing is set at a position separated from the stop zone side edge of the molten metal passage hole by 10 to 150 mm. Method. 3. The slide plate according to claim 1, wherein the slide plate has inclined surfaces at both corners, and the slide plate is restrained by pressing and fixing the side surface portion and fixing by the inclined surface. A method of restraining the slide plate of the slide valve for controlling molten metal outflow.