JP2000233274A - Fixing device for plate brick in sliding nozzle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device for plate bricks in sliding nozzle device which is relatively easy in the tightening in the axial direction, compact in forming the device itself, and difficult to loosen after tightened once. SOLUTION: A cotter mechanism comprising two operating parts 6-1, 6-2 having inclined surfaces 61, 62 opposite to each other and one part to be operated 7 having inclined surfaces 71, 72 corresponding to the inclined surfaces of the operating parts is provided between a side surface 23 in the width direction of a plate brick 2 and a riser wall 14 on a long side of a metal frame. Each cotter mechanism presses the part to be operated against the plate brick 2 side by driving two operating parts in the direction opposite to each other on the long side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for pressing a plate brick against a metal frame in a sliding nozzle apparatus used for controlling a flow of molten steel flowing out of a container such as a ladle or a tundish in a continuous casting apparatus. .

[0002]

2. Description of the Related Art This sliding nozzle device controls the flow rate of molten steel by relatively sliding two or three plate bricks and opening and closing nozzle holes. Large pressure is applied between the surfaces of the plate brick to prevent the leakage of molten steel. When the plate brick slides under this pressure, the plate brick is fixed by a metal frame so as not to shift from a predetermined position.

As means for fixing the plate brick to the metal frame, there are a vertical holding system and a horizontal holding system. this house,
The vertical holding method is mainly aimed at preventing the displacement of the sliding force of the plate brick, and has, for example, a structure shown in FIG. As shown in the figure, the metal frame 1 has rising walls 1 connected to the long side and the short side of the rectangular bottom plate 11 respectively.
2, 13, 14 and 15 are formed, in which the plate brick 2 is housed. This plate brick 2
The one end surface 21 is in contact with the inner surface of the rising wall 13 on the short side, and the other end surface 22 is in contact with the contact block 3 formed of a rectangular block movable in the longitudinal direction. One end of an abutment bolt 4 is hung on the block 3, and the other end is screwed into a female screw hole provided in the abutment block 3 fixed to the rectangular bottom plate 11, and a rising wall 12 on an end side is provided. Through the through-hole provided in the device, and is led out to the outside. In such a structure, when the outer leading end of the contact bolt 4 is rotated, the plate brick 2 can be pressed between the contact block 3 and the rising wall 13, and the plate brick 2 can be fixed.

However, in the vertical holding system shown in FIG. 5, the pressing force generated by the advance of the contact bolt 4 acts as a compressive force for compressing the plate brick 2 in the longitudinal direction. Large cracks extending in the longitudinal direction may be generated. When the plate brick 2 is in use, the thermal expansion of the plate brick 2
Does not undergo thermal expansion and the pressing force increases relatively, thereby increasing the risk of cracking.

[0005] The occurrence of such cracks causes the life of the plate brick 2 to be greatly reduced. That is, the portion of the sliding surface of the plate brick 2 that is in sliding contact with the nozzle hole of the mating plate brick and the damaged portion of the periphery thereof is a portion that is particularly severely damaged by wear and the like due to the influence of molten steel and the like. When a crack enters the crack, the life may be shortened due to the expansion of the crack due to the inhalation of air from the crack and the intrusion of molten steel into the crack, and the molten steel may leak from this portion.

In order to prevent the generation of cracks in the longitudinal direction, which is a defect of the vertical holding, a contact bolt 4 shown in FIG. 4 is also provided in the width direction of the plate brick and pressed simultaneously from the length direction and the width direction. Are also considered. Thereby, it is considered that the generation of cracks in the longitudinal direction due to the pressing in the vertical direction is suppressed by the pressing force in the width direction, and there is an effect of preventing the generation of cracks in the longitudinal direction from the nozzle holes. As described above, the horizontal holding is usually used together with the vertical holding to compensate for the defect of only the vertical holding.

As described above, in the case of the method of tightening with bolts, the heads of the bolts are protruded from the short side and the long side of the metal frame, and it takes time and effort to perform the tightening work. It has a structure in which two or three metal frames for accommodating one or three plate bricks respectively are stacked, and in order to secure a work space for tightening bolts, there is also a problem that the device becomes large. .

Japanese Patent Application Laid-Open No. Hei 10-216925 proposes a plate fixing device in which a wedge is pushed into a side surface of a plate using a link mechanism. However,
If the plate width dimension is small, the link does not work and the plate fixing force is not appropriate, and if the plate width dimension is large, the link does not fit in a predetermined position and the door for operating the link cannot be closed. In addition, since the wedge body and the moving body are integral and have a fixed dimension, the plate cannot be set unless the plate width dimension is finished with high precision, and even if the wedge body is inserted together with the moving body, the wedge body is not fixed to the plate. There is a disadvantage that fastening in the width direction is impossible.

Furthermore, Japanese Patent Publication No. 4-79746 proposes a fixing device for simultaneously tightening in the sliding direction and the width direction. This is a structure in which the wedge body is moved by the rotation of the screw rod and tightens the plate in the sliding direction, and at the same time, the width direction of the plate is tightened by the tightening rod connected to the screw rod. However,
In the metal frame that stores the plate whose size is limited,
Only a screw rod of limited strength can be constructed. For this reason, the sliding of the plate causes the screw rod to bend in the sliding direction due to insufficient strength, so that an initial tightening effect in the sliding direction cannot be expected.
Also, the fastening rod can be configured only with a limited strength. Therefore, since the clamping rod is bent due to insufficient strength,
The initial tightening effect cannot be expected.

In any case, the fixing means for simultaneously pressing the plate bricks vertically and horizontally is effective for preventing the generation of cracks in the longitudinal direction of the plate bricks.
At present, most of them have not been put into practical use due to the above-mentioned drawbacks.

[0011]

The problem to be solved by the present invention is that the tightening in the width direction is relatively easy, the apparatus itself can be made compact, and, once tightened, the sliding nozzle is not easily loosened. The present invention resides in realizing a plate brick fixing device.

[0012]

According to the present invention, there is provided a fixing device for a plate brick in a sliding nozzle device according to the present invention, wherein an inclined surface opposite to each other is provided between a width side surface of the plate brick and a rising wall on a long side of a metal frame. And a cotter mechanism composed of one driven element having an inclined surface corresponding to the inclined surface of the actuator, and each of the cotter mechanisms is provided with two actuators in the longitudinal direction. Are driven in opposite directions to push the driven element against the plate brick.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the embodiments shown in the accompanying drawings.

Embodiment 1 FIG. 1 shows a first embodiment of a fixing device for a plate brick of a sliding nozzle device according to the present invention, which is applied to a lower sliding plate brick of a sliding nozzle device using two plates. It is. FIG.
2 shows a cross section as seen from the line.

In these figures, reference numeral 1 denotes a rectangular bottom plate 1
1 and a metal frame composed of short-side rising walls 12 and 13 and long-side rising walls 14 and 15 erected on the peripheral edge of the bottom plate portion 11. In this metal frame 1, a plate brick 2 has The projecting portion of the flow hole portion of the molten steel is inserted into the through hole 16 of the metal frame and housed.

One side end surface 21 of the plate brick 2 is the metal frame 1
Abuts against the inner surface of the rising wall 13 on the short side of
The other end surface 22 is in contact with one side surface of the contact block 3 formed of a rectangular block movable in the longitudinal direction.

One end of an advancing and retracting abutment bolt 4 is hooked to the abutment block 3, and the other end of the abutment bolt 4 is inserted into a female screw hole 51 provided in a screw block 5 fixed to a rectangular bottom plate 11. It is led out through a through-hole provided in another screwed rising wall 12 on the short side.

Reference numerals 6-1 and 6-2 denote two block-shaped actuators, which form a cotter mechanism together with the driven element 7, and include a width direction side surface 23 of the plate brick 2 and a long side of the metal frame 1. An operating bolt 8 disposed between the side rising wall 14 is screwed therethrough. Each actuator 6-1 and 6
The outer side of 2 is in contact with the rising wall 14 on the long side, and the inner side is formed with inclined surfaces 61 and 62 having opposite inclination directions, respectively.
1 and 72 are slidably in contact with each other.

The operation bolt 8 has a head 18 at one end thereof formed with a hole 18 in the rising wall 12 of the metal frame so that a tool can be easily attached and detached, and is projected outside the metal frame. The other end may extend to the rising wall 13 as shown in FIG. 4 of the second embodiment. However, as shown in FIG. In addition, it is fixed with asobi of about 10 mm in the longitudinal direction.

FIG. 3 is a diagram showing details of the means for fixing the operating bolt 8 by the receiving member 17. As shown in the figure,
The operating bolt receiving portion 17 is in contact with the rising wall 14 and the bottom plate portion 1 corresponding to the length of the side surface 23 in the plate width direction.
Are provided by welding, bolting, cutting, and the like. A recess 83 is formed in the other end of the operating bolt 8 so as to be slidably inserted into the through hole 17-1 of the removal preventing member 17. Then, the operating bolt 8 is fixed to the concave portion 83 with a play within the range of the concave portion by pressing and fixing the member 17-2 for preventing the detachment such as a spring pin. This asobi is for allowing the mutual change of the tightening position of the actuators 6-1 and 6-2.

Each of the operators 61 and 62 is
The operation bolt 8 is screwed with the screw threads 81 and 82 formed in opposite directions, and moves on the operation bolt 8 in opposite directions by the rotation of the operation bolt 8. For example, it is assumed that a male right-hand thread is formed on the thread 81 in the movement area of the first actuator 6-1 and a male left-hand screw is formed on the thread 82 in the movement area of the second actuator 6-2. Then, by turning the operating bolt 8 clockwise, 6-1 in FIG. 1 moves upward and 6-2 moves downward. It will move upward. The operating bolt 8 penetrates the short side rising wall 12 of the metal frame and the operating bolt receiving portion 17 in the longitudinal direction and has an asobi in the longitudinal direction, so that any one of the actuators 6-1 and 6-2 is used. If one of the actuators is tightened first, the operation bolt 8
It can rotate while moving and does not impede the movement of the other actuator, thus allowing both actuators to be tightened. In this way, there is no fixation (handedness) by only one actuator, and depending on the situation of each holding position of the plate,
It can be fixed freely, has excellent holding effect, and can be easily fixed even with a plate with some dimensional errors.

The inclined surfaces 61 and 62 of the actuators 6-1 and 6-2.
On the side, a slope 7 having the same slope angle of this slope
An elongated driven element 7 formed by sandwiching a central flat portion 73 with reference numerals 1 and 72 is arranged to face inclined surfaces 61 and 62 of the respective actuators. The driven element 7 is locked by two fixing bolts 25 provided on the bottom plate portion 11 of the storage metal frame so as to allow a certain amount of movement in the plate width direction.

When the inclined surfaces 71 and 72 of the driven element 7 are inclined at the same angle as the inclined surfaces of the actuators 6-1 and 6-2, a uniform pressing force may be obtained in the same direction. When there is an error in the inclination angle between the two inclined surfaces, a cushion plate such as a ceramic fiber is sandwiched between the widthwise side surface 23 and the driven element 7 or between the driven element and the respective inclined surfaces of the actuator. By doing so, it can be absorbed to some extent.

The cushion plate can be used to prevent the cotter from being overtightened.

Hereinafter, the operation of the cotter mechanism including the operating element and the driven element when the plate brick 2 is attached to the metal frame 1 in FIG. 1 will be described.

When the plate brick 2 is attached to the metal frame 1, in FIG. 2, the projecting portion 24 of the flow hole portion of the molten steel of the plate brick 2 is inserted into the opening of the metal frame 1.
Attach plate brick 2. Next, after tightening the contact bolt 4 and fixing it to some extent in the sliding direction, the operating bolt 8
Tighten. By turning the operating bolt 8 clockwise,
The actuator 6-1 moves upward in the drawing, 6-2 moves downward in the drawing, and the respective inclined surfaces 61 and 62 eventually come into contact with the inclined surfaces 71 and 72 of the driven element 7, and the driven members Child 7
Is pushed in the width direction of the plate brick 2 and the side surface 23 in the width direction of the plate brick is pressed. If necessary, the contact bolt 4 in the sliding direction can be further tightened. Thereby, the metal frame 1 of the plate brick 2
Finish the installation on.

The operation of replacing the used plate brick 2 which has reached the end of its useful life will be described. In this replacement work, first, the sliding nozzle device body is opened to expose the metal frame 1. In this embodiment, the attitude at the time of replacement is such that the upper surface in FIG. 1 is on the ceiling side. Next, when the operating bolt 8 is rotated counterclockwise to loosen it, the operating elements 6-1 and 6
-2 move downward and upward in the drawing, respectively. By the movement of the actuator 6, the pressing force against the plate brick in the width direction of the plate brick is released, and a gap is formed between the driven element 7 and the plate brick. Further, by loosening the contact bolt 4, the plate brick can be removed.

In the embodiment shown in FIG. 1, two actuators 6-
1 and 6-2 show the structure in which the driven element 7 is pressed in the direction in which they are separated from each other, but the structure in which each actuator presses the driven element 7 in the direction in which they approach is also possible by making the respective inclined surfaces reverse. Easy to do.

Embodiment 2 FIG. 4 shows a state where the inclination direction of the inclined surface of the actuator is reversed from that of FIG.
In addition, an example is shown in which the driven element 7 shown in FIG. 1 is omitted, the brick itself is used as the driven element, and the corner portion is an inclined surface of the driven element. In this way, by providing the brick with the function of the driven element, the driven element can be omitted. Further, in the case of this embodiment, the pressing in the sliding direction is omitted, and is fixed to the rising wall on the long side via the fixing block 19. Here, the operating element 6-3 engages the operating bolt 8 with the right screw, the operating element 6-4 engages the operating bolt 8 with the left screw, and the clockwise rotation of the operating bolt presses the plate brick against the fixing block 19. To be fixed.

The working bolt 8 penetrates the rising walls 12 and 13 on the short side of the metal frame in the longitudinal direction in order to fix both corner inclined portions in the plate length direction, and one end is formed through the rising wall 13. By engaging with the actuation bolt receiving portion 17,
It is freely rotatable and slidable in the longitudinal direction, and has an asobi of about 10 mm in the longitudinal direction and is fixed. Therefore, as in the first embodiment, there is no fixing (single handed) by only one actuator, and each of the plates Can be freely fixed according to the situation of the holding position.

Further, each of the two actuators 6-3,
By interposing a cushion plate such as a ceramic fiber between the 6-4 inclined surface and the corner surface of the plate as the inclined surface of the driven element, the angle error of each inclined surface can be absorbed to some extent.

The cushion plate can be used to prevent the cotter from being overtightened.

In each of the first and second embodiments, it is natural that the cotter mechanism and the like are configured so as not to hinder the sliding of the plate. In each of the above embodiments, a metal frame having a bottom plate portion 11 has been described. However, the present invention relates to a metal frame having no bottom plate portion 11, that is, a sliding plate of a three-plate sliding nozzle device. Needless to say, it can be applied to a metal frame and the like.

[0034]

Advantages of the Invention With a cotter mechanism consisting of an actuator and a driven element, the plate brick can be fixed in the horizontal direction simply by pressing the plate brick against the wall of the metal frame, making it easier to work, and with a compact device, tightening is possible. Plate bricks that do not easily loosen can be fixed.

2. Compared with the conventional cotter, the two actuators can be screw-driven in opposite directions, and the rotation of one bolt greatly facilitates the work of fixing the plate brick in the lateral direction. At the same time, no work skills are required.

3. Since the actuator is directly contacted with and fixed to the rising wall of the metal frame, even a small-diameter operating bolt does not bend and the metal frame itself does not need to be enlarged.

4. Since the tightening device in the plate width direction is compact, the size of the SN device itself can be reduced.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a fixing device for a sliding nozzle device plate brick of the present invention.

FIG. 2 shows a cross-sectional structure taken along line AA of FIG.

FIG. 3 shows details of a fixing means of a working bolt by a receiving member.

FIG. 4 shows a sliding nozzle device plate brick fixing device according to a second embodiment of the present invention.

FIG. 5 shows a conventional sliding nozzle device plate brick fixing device.

[Explanation of symbols]

Reference Signs List 1 metal frame 11 bottom plate 12, 13, 14, 15 rising wall 16 through hole of metal frame 17 operating bolt receiving part 17
Reference Signs List -1 Through hole 17-2 Prevention member for removal 18 Working bolt hole 19 Fixing block 2 Plate brick 21 One end face 22 Other end face 23 Width side face 24 Projecting portion of molten steel flow hole 25 Stop bolt 3 Resting block 4 Applying Bolt 5 Screw block 51 Female screw hole of screw block 6-1, 6-2, 6-3, 6-4 Actuator 61, 62 Slope of actuator 7 Actuator 71, 72 Slope of actuator 8 Actuator bolt 81 , 82 Thread of operating bolt 83 Recess

Claims (2)

[Claims] 1. A sliding nozzle device for fixing a plate brick by pressing the same against a metal frame, the device being a fixing device for a plate brick, comprising: a side wall in a width direction of the plate brick and a rising wall on a long side of the metal frame; There is provided a cotter mechanism including two actuators having opposite inclined surfaces and one driven element having an inclined surface corresponding to the inclined surface of the actuator. Each of the cotter mechanisms has two operation members. A sliding nozzle device for fixing a plate brick, wherein the driven member is configured to be pressed against the plate brick by driving the same in a longitudinal direction opposite to each other. 2. The plate nozzle fixing device according to claim 1, wherein the plate brick is used as the driven element, and the corner surface of the plate brick is an inclined surface of the driven element.