JP2005211986A - Tear-drop type brick plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a miniaturized brick plate while safe operation is assured without the occurrence of leakage of molten metal. <P>SOLUTION: The tear-drop type brick plate has a nozzle hole 2 and attains L≤Dx5.5, S≤S<SP>1</SP>x15 and A≤189°xA<SP>1</SP>≥95° when the diameter of the nozzle hole 2 is defined as D, the area of the nozzle hole as S<SP>1</SP>, the area of the brick plate excluding S<SP>1</SP>as S, the overall length of the brick plate as L, the angle of B, X and C as A, and the outside angle of E as A<SP>1</SP>. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention is a brick plate equipped with a nozzle hole in the valve, which is attached to the side or bottom of a molten metal container. Further, the present invention relates to a brick plate used to freely control the flow rate of molten metal by utilizing the change in the nozzle hole area.

To put molten metal made in an electric furnace, converter, etc. into a container and to control the flow rate or to open and close when pouring metal melt to make a mold for the next process, tundish or direct product Use. FIG. 3 is a comparison between a conventional brick plate and a teardrop-type brick plate, where the brick plate is 1, the nozzle holes are 2, and the shapes of the nozzle holes 2 of each brick plate are the same size. In use, two or three of these brick plates are used in close contact, one is moved, the area of the nozzle hole is changed, and the flow rate of the molten metal is freely controlled. As the number of times of use increases, the periphery of the nozzle hole 2 melts and expands. In particular, the direction of movement of the nozzle hole for controlling the flow rate is intense and melts greatly, making it easy for the melt to enter and pinch, causing leakage. FIG. 4 sketches on average the number of times of use and the trace of the erosion transition of the brick plate. Only the moving direction of the nozzle hole 2 is melted and damaged as the number of uses increases. Most of the leakage is concentrated in the moving direction of the nozzle hole 2. In the stop position range where the flow of the molten metal is stopped and then the nozzle hole is moved, no leakage occurs. The reason is that the other brick plate surface of the closed nozzle hole is mechanically closely attached and the temperature of the plate surface is orders of magnitude lower than that of the molten metal, so it quickly solidifies. Because of that. Therefore, the stop position range only needs to be able to withstand high temperatures and have a smooth surface. However, the current brick plate is only used to escape the large brick plate as a preventive measure against the poor quality and technology of refractory brick products in the initial use of the valve and the leakage accidents that occurred frequently during the premature period of machinery. The old facts that had no measures are still inherited.

The brick plate nozzle hole periphery and the brick plate surface in the nozzle hole movement direction are damaged by the passage of the high-temperature melt. If it is used many times, the melting damage deteriorates and is dangerous, so replace it with a new brick plate on the way. Because brick plates are used under special conditions, the price is very expensive and the trade is in tons. Moreover, it was a problem to maintain the old, heavy, wasteful brick plates and heavy labor that did not take into account the current high quality, high technology bricks and the completed valve machinery.

Means for Solving the Invention

In order to solve the above problems, the present invention was developed based on a completely new concept centered on the nozzle holes of the brick plates actually used, and the configuration is adopted as follows. . That is, it is attached to the side surface or bottom of the molten metal container and used to control the flow rate of the molten metal. Brick plate 1 for a valve comprising a nozzle hole 2, a center point X of the nozzle hole 2, a diameter of the nozzle hole 2, a circumference of the nozzle hole 3, a radius R from the center point X to F, a circle The same distance from the circumference 3 to the outer circumference of the brick plate is B, F, C, where the metal melt stops and where it stays is the nozzle stop position 4, the nozzle virtual circumference 5, the metal pad 6, the farthest point from the center point E, the total length L, B, X, C angle a, the area ^S 1, the area of the brick plate 1, excluding the ^{S 1} S of the nozzle hole 2, the outer angle ^{a 1} of the E, the brick plate full width W, the radius R When the contact points at which the outer peripheral line is separated from the circumference in the E direction are B and C, respectively, L ≦ D × 5.5 · S ≦ S ¹ × 15 · A ≦ 189 degrees · A ¹ ≦ 95 degrees.

The invention's effect

According to the first aspect of the present invention, (1) reasonable size without waste and (2) on-site handling are markedly achieved by downsizing the brick plate while ensuring safe operation without causing leakage of molten metal. Easily, (3) reduction of high-temperature heavy muscle labor, (4) great economic effects, and (5) small resources can be obtained.

According to the second aspect of the present invention, the damage area of the brick plate is sufficiently covered by the results investigation, and the object can be achieved with an ideal small area, so that the effects (1) to (5) are obtained.

According to the invention of claim 3, by narrowing the brick plate toward the portion where the melt damage does not reach, the effects (1) to (5) described above, and the tearless drop-shaped brick plate can be obtained. can get.

According to the invention of claim 4, the brick plate point E allows the correct position setting of (1) the brick quickly, and (2) the brick plate point E is used as a fulcrum and there are no other corners. The tightening effect is improved, and the effect of reducing the occurrence and expansion of brick cracks is obtained.

In the embodiment of the present invention, the nozzle hole 2 provided in the brick plate 1, the center point X, the diameter D, the circumference 3, the circumference 3, the same distance outer circumference line of the brick plate 1 from B, F, C, After the molten metal flow stops, the nozzle hole 2 stays at the nozzle stop position 4, its virtual circumference 5, the metal band 6, the point E farthest from the center point X, the total length L of the brick plate, the angle A of the BXC, The radius R from the center point X to F, the area S of the brick plate 1 excluding the nozzle hole 2, the area S ¹ of the nozzle hole 2, and the outer line of the brick plate 1 from the circumference of the radius R is narrow in the E direction. In the brick plate shape where the bending angles of the contacts B, C, and E are A ¹ and the maximum width W of the brick plate ^{1 respectively} , the brick plate 1 is much smaller and lighter than the conventional one having an acute angle E. Teardrop brick plate.

About the length of the brick plate, L ≦ D × 5.5. The melt-damaged part of the brick plate is limited to a very narrow part. From the results of long-term investigation of damaged parts of used abandoned brick plates, even if the current brick plate is used many times, there is no adverse effect of hot molten metal beyond 120 mm in the opening and closing movement direction from the nozzle hole center point X. It does not reach. However, the safe surface and distance of the nozzle hole stop position 4 where the nozzle hole that is completely closed and kept at high temperature is allowed to stand still is practically indispensable. L ≦ D × 5.5 when it is the minimum necessary brick plate incorporated.

About brick plate area S ≦ S ¹ × 15. As described above, an extreme adverse effect is exerted within 120 mm from the center point X in the opening / closing movement direction, but the range is within the angle A. Melting damage around the nozzle holes other than the angle A is as small as 1/5 or less of the angle A range. Therefore, if the slimming is made practically inconveniently from the nozzle hole 2 through which the melt passes toward the stop position 4, the used economic brick plate may be S ≦ S ¹ × 15.

About the angle A ≦ 189 degrees of the brick plate. The flow of the melt stops, moves in the opening and closing direction, and as the distance from the nozzle hole 2 increases, the width W of the brick plate becomes narrower. Even if the width is up to D / 2, safety is ensured without any trouble, and most of the extreme melt damage due to the passage of the melt occurs within 189 degrees of the angle A and moves away from the nozzle hole 2. Accordingly, it becomes thin in a wedge shape and disappears within 120 mm from the center point X. To improve the shape of the brick plate 1 to an economically required shape based on this track mark, the angle A is an imaginary circumference from B and C where the extension line of 189 degrees intersects the outer peripheral line toward the nozzle hole stop position 4. It has been found best to narrow the outer brick width to D / 2. Therefore, the angle A of the brick plate is set to an angle A ≦ 189.

About the outside inclination angle A ¹ ≧ 95 degrees of the brick plate tip E. When the brick plate is set in the valve device, the nozzle side of the brick plate is placed on the machine, and then the E side is inserted, and the E side is pushed from the E side to the F side by a cylinder and fixed. At that time, even if the position of the brick plate on the nozzle hole side is slightly shifted, the position of the nozzle hole 3 is not misaligned because the periphery of the brick plate is a circle having the same distance from the circumference 4, but the virtual circumferential side is the center of W If set off the line L, the nozzle stop position will also be offset from the center line L. Therefore, the brick plate will be abnormally deformed on the smooth surface due to the uneven distribution of high temperature, and the brick plate will not move or crack will occur. It is easy and sometimes causes a shutdown. Point E ensures correct alignment with the center on the cylinder side, eliminates misalignment of the brick plate set, and allows for quick and accurate work. In addition, the effect of the metal band for the purpose of preventing the occurrence of cracking with the brick plate and preventing the crack from expanding is improved with the point E as a fulcrum, and the number of times the brick plate is used is increased and the safety operation is improved.

  Top view of teardrop-type brick plate   Cross section of teardrop-type brick plate assembly   Comparison of conventional brick plate and teardrop brick plate   Transition of melting damage of brick plate by use frequency

Explanation of number

1 Brick plate 2 Nozzle hole 3 Circumference 4 Nozzle hole stop position 5 Virtual circumference 6 Metal band A Angle A
A ¹ angle A ¹
B Contact B
C Contact C
D Diameter E E Point F F Point G Brick Plate Perimeter L Brick Plate Width L ¹ Brick Plate Width Centerline R Radius of the Circle Created with B, C, F Centered on Center Point X W The Brick Plate Width of

Claims (4)

A brick plate for a valve mounted on the side or bottom of a molten metal container and used to control the flow rate of the molten metal, the nozzle hole 2, its center point X, its diameter D, and the length L of the brick plate 1 When the corners B, X, and C are angles A and E, the outside angle A ^{1 of the} E, the area of the nozzle hole 2 is S ¹ , and the area of the brick plate 1 excluding S ¹ is S, the length L is the diameter D 5.5 times. A teardrop-type brick plate with L ≦ D × 5.5. A teardrop-type brick plate in which the area S of the brick plate 1 excluding the area S ¹ of the nozzle hole 2 is 15 times or less the area S ¹ of the nozzle hole 2 and S ≦ S ¹ × 15.   The angle A of the corners B, X, and C connecting the two points B and C, which are narrow and branch from the circumference of the radius R toward the point E as the center point X, is 189 degrees or less, and A ≦ Teardrop-type brick plate at 189 degrees. A teardrop-type brick plate in which the outer angle A ¹ of the tip E of the brick plate is 95 degrees or more and A ¹ ≧ 95 degrees.

Images