JPH07214247A - Attaching/detaching device for side nozzle for continuous casting - Google Patents

Abstract

PURPOSE:To provide an attaching and detaching device for a side nozzle suitable for a case of continuous casting of a thin slab by using divided nozzles. CONSTITUTION:This attaching and detaching device is for the side nozzle to be used in the case of continuous casting of the thin slab by a single roll system or twin roll system. A nozzle mounting base 12 is installed to rails 11a laid on a stationary base 11 freely movably in the drawing direction of the thin slab along these rails. This nozzle mounting base 12 is provided with an energizing means 13 for energizing this base in a drawing direction at all times. An air cylinder 16 for pressing the size nozzle 17 installed via a centering adjustment mechanism 20 or 25 on the front end side thereof in a direction orthogonal with the drawing direction is installed to the nozzle mounting base 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detaching device for a continuous casting side nozzle used in a single roll system or a twin roll system.

[0002]

2. Description of the Related Art Recently, 1 to 10 m from molten metal such as molten steel
A method of directly producing a thin cast piece having a thickness of about m by a continuous casting machine has been put into practical use. According to this continuous casting method, it is not necessary to manufacture a thin plate from a thick slab through a multi-step hot rolling process as in the past, and a cold rolling work for molding a slab to a final thickness is also a light process. Therefore, a large economic effect can be obtained by simplifying the process and equipment.

As this type of continuous casting method, there are a vertical method in which the solidification process proceeds vertically from casting to a vertical method and a horizontal method in which the solidification process proceeds laterally. Among these, the vertical type includes a twin roll type in which a molten metal pool is formed between a pair of cooling rolls rotating in opposite directions, and a roll in which a molten metal pool is formed between a cooling roll and a metal belt.・
There is a belt system, and the horizontal system is a twin roll system using upper and lower rolls, a single roll system with only a lower roll,
There is also a roll / belt system in which both twin and single rolls are combined with a metal belt.

In any of these systems, the molten metal in the pool of water is cooled at the portion in contact with the surface of the chill roll and begins to solidify from the skin, gradually forming a solidified shell and moving toward the center of the thickness. Solidification proceeds, and a thin cast piece is cast. At this time, in any case of the horizontal system, it is essential to prevent leakage when the molten metal is poured from the tundish to the cooling roll.

Therefore, as shown in FIG. 7, an integrated nozzle 2 made of refractory is attached to the tip of the tundish 1, and the tundish carriage 3 is moved closer to the rotating cooling roll 4 immediately before casting. Thus, in the single roll system, the nozzle 2 is pressed against the outer peripheral surface of the cooling roll 4 to be in close contact, and in the twin roll system, it is pressed against the outer peripheral surface of the lower roll and the side surface of the upper roll to be in close contact, so that a mechanism for pouring is provided. There is. However, when an integrated nozzle is used, there is always a gap between the roll and the nozzle due to the structure. Therefore, in order to prevent this, an inorganic sealing material 5 such as ceramic fiber is provided between the roll and the nozzle. There is.

[0006]

However, in the case of the integral type nozzle, even if the sealing material is provided between the rolls and the nozzles, especially in the case of the twin roll system, the bottom nozzle part and the side nozzle part are combined into 3 parts. Since it is necessary to perform centering adjustment so that all the surfaces come into contact, there is a problem that the adjustment takes time, and a gap is likely to be formed due to a difference in thermal expansion between the nozzle and the roll, rattling of the apparatus, and the like.

Further, since the sealing material provided between the roll and the nozzle is eroded by the molten metal, the metal intrudes into the molten metal to form a fixed shell, and the fixed shell is peeled off together with the cast piece. The slab is cast in the slab and causes slab cracking. Further, after the peeling, the water is again poured and the same thing is repeated, or the water leaks. Therefore, although the mechanism in which the seal material is interposed between the roll and the nozzle can be applied to casting for a short time, there is a problem in applying it to casting for a long time.

Therefore, if the nozzle is a divided nozzle of a bottom nozzle and a side nozzle, each nozzle can be processed with high accuracy and the centering adjustment can be easily performed. It can be solved.
It is an object of the present invention to provide a side nozzle attachment / detachment device suitable for continuously casting thin cast pieces using such a divided nozzle.

[0009]

In order to achieve the above-mentioned object, the desorption device for a side nozzle of the present invention is a side nozzle used when continuously casting thin-walled cast pieces by a single roll method or a twin roll method. A desorption device, a nozzle mounting base that is installed on a fixed base so that the thin cast piece is movable in the drawing direction, a biasing means that constantly biases this nozzle mounting base in the drawing direction, and a nozzle mounting base that is installed on the nozzle mounting base. Further, a pressing mechanism for pressing the side nozzle, which is installed on the tip side thereof via the centering adjusting mechanism, in a direction orthogonal to the drawing direction is provided.

[0010]

The side nozzle attaching / detaching device of the present invention comprises a nozzle mounting base installed on the fixed base so as to be movable in the drawing direction of the thin cast piece, and a biasing means for constantly biasing the nozzle mounting base in the drawing direction. A centering adjustment of the side nozzles is provided because it is equipped with a pressing mechanism that is installed on the nozzle mounting base and that presses a side nozzle installed on the tip end side thereof through a centering adjusting mechanism in a direction orthogonal to the drawing direction. Even if the side surface of the roll changes due to thermal expansion or thermal strain, the side nozzles follow the change due to the pressing mechanism. Further, even if the contact surface of the side nozzle against the roll is worn, it is pressed against the roll with a predetermined force by the biasing means.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in FIGS. 1 is a sectional view showing the configuration of a first embodiment of a side nozzle attachment / detachment device of the present invention applied to a twin roll system, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a side view of FIG. 1, and FIG. FIG. 5 is a view similar to FIG. 1 in the second embodiment, FIG. 5 is an enlarged view taken along the line AA of FIG. 4, and FIG. 6 is an enlarged view taken along the line BB of FIG.

1 to 3, reference numeral 11 denotes a fixed base installed on, for example, a tundish truck, which moves in the pull-out direction of the thin cast slab as the tundish truck moves. A rail 11a is laid on the fixed base 11 in parallel with the pull-out direction, and a nozzle mounting base 12 is mounted so as to be movable along the rail 11a.

In the present embodiment, the first fixed base 11b for mounting the fixed base 11 on the tundish truck and the first fixed base 11 by screwing the height adjusting screw 11c back and forth.
It is constituted by a second fixed base 11d whose height position is adjustable with respect to b, and the rail 11a is laid on the second fixed base 11d.

Numeral 13 is a biasing means for constantly biasing the nozzle mount 12 toward the pull-out direction side, that is, the lower roll 14 side, which is interposed between the second fixed base 11d and the nozzle mount 12, for example. Coil spring 13
a or a disc spring (not shown) (hereinafter simply referred to as "coil spring 13a") and this coil spring 1
It is composed of a biasing force adjusting bolt 13b of 3a. Reference numeral 15 is a stopper screw that regulates the limit of movement of the nozzle mount 12 toward the lower roll 14 side.

Reference numeral 16 denotes a pressing mechanism installed on the nozzle mounting base 12, for example, an air cylinder (hereinafter simply referred to as "air cylinder"), the rod of which is directed toward the side nozzle 17 side orthogonal to the drawing direction. is set up. A nozzle supporting metal 18 and a fixed metal 19 having a cooling structure are attached to the rod end of the air cylinder 16 via a centering adjusting mechanism 20. In addition,
Needless to say, the stroke of the air cylinder 16 should have a margin so as to cope with wear of the contact surface and heat change of the side surface of the upper roll 21 even after the side nozzle 17 is pressed against the side surface of the upper roll 21. Absent. A hydraulic cylinder may be used instead of the air cylinder 16.

By the way, a guide plate 1 projecting from the nozzle mounting base 12 is provided on the base end side of the nozzle supporting metal piece 18.
2a and the bottom plate 12b are provided with a pair of guide plates 18a, respectively, so that the guide plates 18a can be smoothly moved to the side nozzle 17 side.

The centering adjusting mechanism 20 is provided to facilitate the work of adjusting the side nozzle 17 to the side surface of the upper roll 21 and the outer peripheral surface of the lower roll 14 in an easy manner. It is composed of a position adjusting screw 20b for the spherical seat 20a and a fixing screw 20c for fixing the spherical seat 20a at the adjusted position.

Reference numeral 22 denotes a fixed metal piece 19 via a spring washer 23.
Is a fixing screw for fixing the side nozzle 17 to
The side screw 17 can be held from above by a predetermined pressing force by screwing the fixing screw 22 back and forth with respect to the fixing hardware 19. Therefore, even if the fixed metal piece 19 thermally expands, the side nozzle 17 can always be kept pressed against the outer peripheral surface of the lower roll 14.

Reference numeral 24 denotes a bottom nozzle, both side wall surfaces 24a of which are in contact with the side nozzle 17, and the tip of which is in contact with the lower roll 14 in the cylinder length direction.

FIGS. 4 to 6 are views showing the construction of the second embodiment of the side nozzle attachment / detachment device of the present invention.
The centering adjusting mechanism 25 is replaced with a pin, a cotter or the like instead of the centering adjusting mechanism 20 using the spherical seat 20a and the like in the first embodiment shown in FIG.

That is, in FIGS. 4 to 6, reference numeral 25a denotes a first adjusting metal member pivotally attached to the fixed metal member 19 by a pin 26 so that its lower side is swingable, and an upper portion of the first adjusting metal member 25a. The fixed hardware 19 side is formed in an inclined shape that is tapered toward the upper end, and is held by the fixed hardware 19 by adjusting the insertion amount of the first cotter 25b inserted between this inclined portion and the fixed hardware 19. The surface alignment of the upper and lower surfaces of the side nozzle 17 is performed. Then, after the adjustment of the vertical alignment, the fixing screws 27 that are screwed into the fixed hardware 19 are used for fixing. Reference numeral 28 is an insertion amount adjusting screw of the first cotter 25b.

Reference numeral 25c denotes a second adjusting metal member 25c fixed to the tip of the nozzle supporting metal member 18 by, for example, welding or bolting, and the second adjusting metal member 25c further includes the first adjusting metal member 25c.
The adjustment hardware 25a is also pivotally attached at one side (upper side in FIG. 5) by a pin 29 so as to be swingable. The second adjustment metal piece 25c is also formed in an inclined shape which is tapered toward the other side like the first adjustment metal piece 25a, and is inserted between the inclined portion and the first adjustment metal piece 25a. By adjusting the insertion amount of the second cotter 25d, the surface alignment of the side nozzle 17 in the two right and left directions is performed. After this face-to-face adjustment, it is fixed by the fixing screw 30 that is screwed into the first adjustment metal piece 15a. In addition, 31 is an insertion amount adjusting screw of the second cotter 25d.

The desorption device for the side nozzle for continuous casting according to the present invention has the above-described structure, and the side nozzle 17 is mounted as follows. First, the air cylinder 1 with the fixing screw 20c shown in FIGS. 1 to 3 and the fixing screws 27 and 30 shown in FIGS. 4 to 6 being loosened.
The rod 6 is moved out, the fixing screw 22 is tightened in advance, and the side nozzle 17 attached to the fixed metal piece 19 is brought into contact with the side surface of the upper roll 21. Then, FIGS.
4 and 6, and the insertion amount adjusting screws 28 and 31 shown in FIGS. 4 to 6 are screwed forward and backward to center the side nozzle 17, and then the fixing screw 20c or 27 is used.・ Tighten 30. Then, finally, the rod of the air cylinder 16 is moved out so that the side nozzle 17 presses the side surface of the upper roll 21 with a predetermined pressing force.

As described above, when the side nozzle 17 is mounted by using the continuous casting side nozzle attaching / detaching apparatus of the present invention, the side nozzle 17 is the air cylinder 16.
Since it is pressed against the side surface of the upper roll 21, the side surface of the upper roll 21 changes due to thermal expansion or thermal strain,
In addition, the side nozzle 17 causes the upper roll 2 due to long-time casting.
Even if it is worn away by the side surface of No. 1, no water jug etc. will occur.

Further, since the side nozzle 17 is attached to the fixed metal piece 19 via the spring washer 23, the attachment state of the side nozzle 17 does not change even if the fixed metal piece 19 is thermally expanded.

Further, since the side nozzle 17 is attached through the centering adjusting mechanism 20 or 25, the adjustment of the surface alignment of the side nozzle 17 is performed by the fixing screw 20c or 2.
After loosening 7 and 30, the respective position adjusting screws 20b or the insertion amount adjusting screws 28 and 31 are screwed back and forth to perform centering, and the fixing screw 20c or 27 and 30 can be tightened again.

Since the side nozzle 17 is movable in the drawing direction of the thin cast piece and is always urged by the urging means 13 with a constant force in the drawing direction, the side nozzle 17 moves to the lower roll 14. Even if the contact surface is worn by the influence of the lower roll 14, the molten metal does not leak.

The centering adjusting mechanism 2 shown in FIGS.
In the case of No. 5, the fixed contact is the fixing screw 27/30 part, the pin 26/29 part, and the first or second cotter 25b / 2.
Since there are 3 points on the tip of 5d, temporarily fix screws 27 ・ 30
Even if is loose, the adjustment surface does not deteriorate rapidly.

[0029]

EFFECT OF THE INVENTION Since the decoupling apparatus for the side nozzle for continuous casting according to the present invention has the structure as described above, the centering adjustment for the upper roll and the lower roll of the side nozzle, which is a preparatory work for casting, is easy and short. Can be done in time. Further, even if the upper roll and the lower roll are deformed due to thermal expansion or the thermal influence of the apparatus, the side nozzles can follow these deformations, and casting can be performed for a long time without a pouring or leaking of hot water.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a first embodiment of a side nozzle attachment / detachment device of the present invention applied to a twin roll system.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view of FIG.

FIG. 4 is a cross-sectional view showing a configuration of a second embodiment of a side nozzle attachment / detachment device of the present invention applied to a twin roll system.

5 is an enlarged view taken along the line AA of FIG.

6 is an enlarged view taken along the line BB of FIG.

FIG. 7 is a perspective view showing a state in which a conventional integrated nozzle is mounted on a tundish on a tundish carriage.

[Explanation of symbols]

 11 Fixed Base 11a Rail 12 Nozzle Mounting Base 13 Energizing Means 14 Lower Roll 16 Air Cylinder 17 Side Nozzle 18 Nozzle Support Hardware 19 Fixed Hardware 20 Centering Adjustment Mechanism 21 Upper Roll 25 Centering Adjustment Mechanism

Claims (1)

[Claims] 1. A desorption device for a side nozzle used when continuously casting a thin cast piece by a single roll method or a twin roll method, wherein the nozzle is installed on a fixed base so as to be movable in a pulling direction of the thin cast piece. A mounting base, a biasing means that constantly biases the nozzle mounting base in the drawing direction, and a side nozzle that is installed on the nozzle mounting base and is installed at the tip end side of the nozzle through a centering adjustment mechanism and is orthogonal to the drawing direction. An apparatus for attaching and detaching a side nozzle for continuous casting, comprising a pressing mechanism for pressing in the direction of