JPH10180430A - Method for changing interval of supported guide rolls of cast slab for continuous casting and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interval changing method of supported guide rolls of a cast slab for continuous casting which can easily change the interval between the rolls during casting and can precisely keep the positions of the rolls before and after changing, and a device therefor. SOLUTION: An upper and a lower frames 1, 3 supported so as to be freely rotatable to the rolls 2, 4, are arranged so as to be mutually faced, and at the four corner parts of the lower frame, and upper stopper 7 and a lower stopper 12 having a prescribed interval in the vertical direction, are arranged. Each guide body 10, 11 of a guide member G having vertical guide surface X along the drawing-out direction of the cast slab so that the upper frame 1 shifts while being guided between the upper stopper 7 and the lower stopper 12, is arranged to each upper and lower frame 1, 3, and an actuator 15 for working the upper frame 1 is arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for changing the spacing of a slab support guide roll for continuous casting, and more particularly to a method for changing the slab support guide roll for continuous casting. The present invention relates to an interval changing method and an apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Publication No. 4-56707 discloses a technique for changing a roll interval during casting. In this conventional example, as shown in FIG. 8, the upper end of a column (also called a rod) 5 fixed to the lower frame 3 is connected to a piston rod of a servo hydraulic cylinder 15S fixed to the upper frame 1. . Then, the servo hydraulic cylinder is actuated based on a command based on the electric / hydraulic signal to position the roll at a predetermined roll interval. However, since the upper frame 1 is fixed by the positioning using the servo hydraulic cylinder, pressure fluctuation from the slab is Therefore, there is a disadvantage that the interval is likely to fluctuate.

[0003]

SUMMARY OF THE INVENTION In view of the foregoing, the present invention has been developed for continuous casting, in which the roll interval can be easily changed during casting and the position of the roll before and after the change can be accurately maintained. An object of the present invention is to provide a method and an apparatus for changing the interval of a slab support guide roll.

[0004]

According to the present invention, there is provided a method for changing the interval between a slab support guide roll for continuous casting and a movable frame and a fixed frame which rotatably support the roll are provided to face each other, and the four corners of the fixed frame are provided. In the part, an outer stopper and an inner stopper are provided at a predetermined interval in the roll facing direction, and the movable frame is moved between the outer stopper and the inner stopper by guiding the movable frame on a vertical guide surface along the slab drawing direction. In this case, two types of roll intervals are selectively obtained by contacting the inner stopper or the outer stopper. In addition, the apparatus for changing the interval between the slab support guide rolls for continuous casting according to the present invention is provided with a movable frame and a fixed frame that rotatably support the rolls facing each other, and at four corners of the fixed frame, a roll facing direction is provided. Guide members each having a vertical guide surface along a slab withdrawal direction such that the movable frame is guided and moved between the outer stopper and the inner stopper at predetermined intervals. Is provided on each of the movable and fixed frames, and an actuator for operating the movable frame is provided.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a method and an apparatus for changing the interval of a slab support guide roll for continuous casting according to the present invention will be described with reference to FIGS. An upper frame 1 serving as a movable frame rotatably supports an upper roll 2 on a lower surface side via a bearing. Reference numeral 3 denotes a lower frame which is a fixed frame, and rotatably supports a lower roll 4 on the upper surface side via a bearing in opposition to the upper frame 1. Reference numerals 5 denote rods provided at four corners of the upper and lower frames 1 and 3. The lower end of each rod 5 is fixed to the lower frame 3, and the upper end penetrates through the through hole 6 of the upper frame 1. The outer upper stopper 7 extended upward and mounted on the large diameter portion 5A
(Outer stopper) is fixed by a cotter 8.

On the upper frame 1, an upper liner 9 which contacts the upper stopper 7 is fixed by bolts 9 '. A guide body 10 having a U-shaped cross section is attached to the lower surface of the upper frame 1 so as to surround the rod 5 with its opening side facing each other. A joint plate 10 'is provided at the center in the vertical direction on the opening side of the guide body 10. A guide body 11 on the lower frame 3 has a surface facing the outer surface of the guide body 10 as a vertical guide surface X along the slab drawing direction.
Is protruding. The guide members 10 and 11 form a set of guide members G. A lower stopper 12 (inner stopper) for defining a position of the upper frame 1 toward the lower frame 3 (inside) is formed on the upper surface of the guide body 11, and a ring-shaped lower liner that comes into contact with the lower stopper 12. 13 is formed on the upper frame 1.

The upper surface of the upper liner 9 and the lower surface of the lower liner 13 relative to the dimension "H" between the lower surface of the upper stopper 7 and the upper surface of the lower stopper 12 on the lower frame 3 side. The dimension “h” between is reduced. That is, the upper frame 1 is moved up and down at a position where the upper liner 9 rises and the upper liner 9 hits the upper stopper 7, and when the upper frame 1 moves down and the lower liner 13 hits the lower stopper 12. Position. And
The upper frame 1 moves between the upper and lower stoppers 7 and 12 while being guided by a vertical guide surface along the slab withdrawal direction.

Reference numeral 15 denotes a hydraulic cylinder (actuator) having a position detecting function. A main body frame 15 'is attached to the lower frame 3 via a bracket 16, and a piston rod 15 "is connected to the bracket 17 of the upper frame 1. And are arranged at the four corners of the upper and lower frames 1 and 3 corresponding to the rods 5.

The change of the roll interval during casting is performed in the following manner. Prior to the casting operation, the roll spacing is extended. To increase the roll interval, use the hydraulic cylinder 15
The extension operation is performed. When the upper frame 1 rises and the upper liner 9 on the upper frame 1 hits the upper stopper 7 on the upper end of the rod 5, the extension operation of the hydraulic cylinder 15 is stopped. In order to reduce the roll interval during casting, the hydraulic cylinder 15 is contracted. At this time, on the entry side and the exit side in the slab withdrawal direction, the entry side hydraulic cylinders 15A, 15A
Control is performed such that the reduction speed of the hydraulic cylinders 15B, 15B 'on the output side is increased with respect to A'. Upper frame 1
Is lowered, and the reducing operation of the hydraulic cylinder 15 is stopped at a position where the lower liner 13 on the upper frame 1 side hits the lower stopper 12. To extend the reduced roll spacing during casting, the hydraulic cylinder 15 is extended. At this time, on the entry side and the exit side in the slab withdrawal direction, control is performed such that the extension speed of the entry-side hydraulic cylinders 15A, 15A 'is increased with respect to the exit-side hydraulic cylinders 15B, 15B'. The extension operation of the hydraulic cylinder 15 is stopped at the position where the upper frame 1 moves up and the upper liner 9 on the upper frame 1 hits the upper stopper 7 of the lower frame 3.

During ascending and descending, the upper frame 1 is guided by a vertical guide surface X of each guide member G along the slab pull-out direction so that the upper frame 1 is not inclined in the slab width direction. The upper frame 1 can be prevented from being displaced even if the upper frame 1 is received in the upper and lower rolls 2 and 4 eccentrically in the longitudinal direction of the roll. In addition, the position of the upper roll 2 at the expanded roll interval is determined by pressing the upper frame 1 against the upper stopper 7 via the upper liner 9, and the position of the upper roll 2 at the reduced roll interval is determined. Since the upper frame 1 is determined by attracting the upper frame 1 to the lower stopper 12 via the lower liner 13, the position of the upper roll 2 can be accurately maintained before and after the change.

On the entry side and the exit side in the slab withdrawal direction, when the reduction speed of the exit side hydraulic cylinders 15B, 15B 'is controlled to be faster than the entry side hydraulic cylinders 15A, 15A', the upper and lower rolls are controlled. The operation of rolling down the unsolidified layer can be performed on the slab C being transferred between 2 and 4. The fine adjustment of the roll interval is performed by the shim 9A of the upper liner 9 before the casting operation.
It is possible by adjusting the thickness of the lower shim 13A, 13B, or by adjusting the thickness of the shim of the lower stopper, or both. It is.

In the above embodiment, the actuator 1
5 illustrates a hydraulic cylinder with a position detection function, but may be a motor cylinder or the like with a position detection function.

In the above embodiment, the guide member G having the vertical guide surface along the slab drawing direction is provided with the guide member 10 provided on the upper frame 1 and the guide member G provided on the lower frame 3
7, and as shown in FIG. 7, the flat guide body 20 provided on the lower frame 3 and the flat guide body 20
May be configured with a U-shaped guide body 21 having a U-shaped cross section. In this case, since two vertical guide surfaces are provided for one set of guide members G, guidance with a lower surface pressure is possible.

[0014]

According to the present invention, the roll interval can be easily changed during casting, and the position of the roll can be accurately maintained before and after the change.

[Brief description of the drawings]

FIG. 1 is a partial front view of a slab support and guide device for continuous casting according to the present invention.

FIG. 2 is a plan sectional view taken along line AA of FIG.

FIG. 3 is a partially cutaway side view along the line BB in FIG. 1;

FIG. 4 is an enlarged sectional view of a main part.

FIG. 5 is an explanatory diagram showing a state in which an upper frame is raised.

FIG. 6 is an explanatory view showing a state in which a gap t is formed between the upper liner of the upper frame and the upper stopper of the lower frame by lowering the upper frame.

FIG. 7 is a plan view showing a modification of the present invention.

FIG. 8 is a front view of a conventional device.

[Explanation of symbols]

 Reference Signs List 1 upper frame (movable frame) 2 upper roll 3 lower frame (fixed frame) 4 lower roll 7 upper stopper (outside stopper) 9 upper liner 10 guide body 11 guide body G guide member 12 lower stopper (inner stopper) 13 lower liner 15 Hydraulic cylinder (actuator)

Claims (3)

[Claims] 1. A movable frame and a fixed frame rotatably supporting a roll are provided to face each other, and an outer stopper and an inner stopper are provided at four corners of the fixed frame at predetermined intervals in the roll facing direction. And moving the movable frame between the outer stopper and the inner stopper by guiding the movable frame along a vertical guide surface along the slab pull-out direction, and selectively contacting the inner stopper or the outer stopper with two types of roll intervals. The method for changing the spacing of the slab support guide rolls for continuous casting, characterized in that: 2. A movable frame and a fixed frame that rotatably support a roll are provided to face each other, and an outer stopper and an inner stopper are provided at four corners of the fixed frame at predetermined intervals in the roll facing direction. , Each movable body and fixed frame are provided with a guide member of a guide member having a vertical guide surface along a slab drawing direction so that the movable frame is guided and moved between the outer stopper and the inner stopper, and the movable frame is operated. An apparatus for changing the interval of a slab support guide roll for continuous casting, comprising an actuator that performs the operation. 3. The continuous casting slab according to claim 2, wherein the guide member is constituted by a flat guide body and a U-shaped cross-sectional guide body into which the flat guide body is fitted. Device for changing the distance between support guide rolls.