JP2001287000A - Roller apron segment for continuous casting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller apron segment in a continuous casting apparatus with which the load can quickly be released in a simple structure when the excess load is applied. SOLUTION: This roller apron segment is provided with a pair of frames 1 oppositely disposed, a plurality of rolls 2 having rotating shafts disposed at the right angle to the longitudinal direction of the frames, rods 3 for fixing arranged in the four corners of the frames, upper stopper mechanisms 4 and lower stopper mechanisms 5 arranged at both end parts of the rods for fixing and an accumulator 6. Each upper stopper mechanism 4 is provided with a holding tool 4b fitted to the rod 3 for fixing and a hydraulic ram 4c arranged between the holding tool 4b and the frame 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a roller apron segment constituting a roller apron provided in a continuous casting device.

[0002]

2. Description of the Related Art A continuous casting apparatus is known as an apparatus for continuously producing slabs. FIG. 6 is a schematic diagram illustrating an example of a curved continuous casting apparatus. In the figure, a tundish 11 has an immersion nozzle 12 at its bottom and is mounted on a tundish car 13. Below the immersion nozzle 12, a mold 14 and a roller apron 15 are provided. The roller apron 15 includes a vertical roller apron segment 15a, a plurality of curved roller apron segments 15b, and a plurality of horizontal roller apron segments 15c. Each roller apron segment 15a, 15b, 15c is composed of a plurality of roll pairs, and each roll pair is arranged to face each other with the slab C therebetween.

[0003] During casting, the immersion nozzle 12 is
The molten metal in the tundish 11 is then injected into the mold 14 through the immersion nozzle 12. The injected molten metal starts to solidify from a position in contact with the inner wall surface of the mold 14 to form a solidified shell, and then is continuously pulled out from the lower opening of the mold by the roller apron 15 to form a slab C. .
The slab C passes through the roller apron 15 and is conveyed to the downstream side. After solidification to the inside is completed, the slab C is cut into a predetermined length by a cutting machine (not shown) provided on the downstream side of the roller apron 15. Is cut off.

[0004] During the casting, the slab C may stop in the roller apron 15 due to a trouble such as breakout. Slab C is roller apron 15
When stopped inside, the curved portion of the slab C deforms further inward due to shrinkage due to cooling. For this reason, a load is applied to the curved roller apron segment 15b in the inward direction of the curved portion, and a load is applied to the horizontal roller apron segment 15c in a direction to push up the upper roll. If this load is large, the roller apron segments 15b and 15c may be damaged.

[0005] When an excessive load is applied to the roller apron, a mechanism for eliminating the load is disclosed in Japanese Patent Laid-Open No. 9-2069.
No. 01 is disclosed. This mechanism includes protrusions at two locations on the outer periphery of an upper end of a fixing rod for fastening an upper frame and a lower frame constituting a horizontal roller apron segment. In addition, a projection is formed between the upper frame and the projection at two locations on the outer periphery, and includes a fixing bracket that rotates about the axis of the fixing rod.

[0006] In this mechanism, a projection provided on a fixing rod and a projection provided on a fixing bracket are usually in contact with their opposing surfaces. By rotating the fixing member, the protrusion provided on the fixing member is released from the protrusion provided on the fixing rod, and the fastening between the upper frame and the fixing rod is released.

However, this mechanism requires a large driving force to rotate the fixture because the fixture is rotated while an excessive load is applied to the opposing surface of the projection. In addition, since the load increases as the stop time increases, the rotation speed of the fixing bracket decreases, and the load further increases until the protrusion is removed, so that the fixing bracket may not rotate. .

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a roller apron segment capable of releasing a load with a simple structure when an excessive load is applied.

[0009]

The gist of the present invention resides in a roller apron segment of the following continuous casting apparatus (see FIG. 1).

A pair of frames 1 whose longitudinal direction is parallel to the pass line and are opposed to each other with the pass line interposed therebetween are provided so as to form a pair with each of the opposing surfaces of the pair of frames 1. A plurality of rolls 2 in which the direction of the rotation axis 2a is perpendicular to the longitudinal direction of the frame 1, a fixing rod 3 provided through four corners of the pair of frames 1,
A roller of a continuous casting apparatus that includes stopper mechanisms 4 and 5 provided at both ends of the fixing rod 3, and sets an interval between a pair of frames 1 by the fixing rod 3 and the stopper mechanisms 4 and 5. An apron segment, at least one of the stopper mechanisms 4, 5 is provided with a stopper 4 b fitted into the fixing rod 3 from a direction perpendicular to the axis thereof, and a hydraulic pressure provided between the stopper 4 b and the frame 1. A roller apron segment for a continuous casting apparatus, comprising: a ram 4c. This roller apron segment preferably comprises an accumulator 6 which supplies a pressure medium to the hydraulic ram 4c.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A roller apron segment according to the present invention will be described with reference to FIGS. FIG.
FIG. 2 is a partial cross-sectional front view illustrating an example of the horizontal roller apron segment of the present invention, and FIG. 2 is a side view of the same.
In these figures, a horizontal roller apron segment is provided at a pair of frames 1 arranged opposite to each other, a plurality of pairs of rolls 2 provided in the longitudinal direction of the frame 1, and four corners of the frame 1. A fixing rod 3, an upper stopper mechanism 4 provided at an upper end of the fixing rod 3, and a lower stopper mechanism 5 provided at a lower end of the fixing rod 3
And an accumulator 6 for supplying hydraulic oil to the upper stopper mechanism 4 and hydraulic cylinders 7 provided on the left and right sides of the frame 1.

The pair of frames 1 is constituted by an upper frame 1a and a lower frame 1b, and the longitudinal direction thereof coincides with the path line P of the horizontal roller apron segment. Opposing surfaces of a pair of frames 1, that is, upper frame 1
a and a plurality of rolls 2 whose direction of the rotation axis 2a is perpendicular to the longitudinal direction of the frame 1 are provided on the lower surface of the lower frame 1a and the upper surface of the lower frame 1b, respectively. , And are supported by the bearing 2b.

A through hole 1c is provided at the same position at each of the four corners of the upper frame 1a and the lower frame 1b, and the fixing rod 3 is inserted through the upper and lower through holes 1c. The fixing rod 3 includes an upper stopper mechanism 4 at an upper end and a lower stopper mechanism 5 at a lower end. The upper stopper mechanism 4 includes a cotter hole 4a formed at the upper end of the fixing rod 3 in a direction perpendicular to the axis thereof, a cotter (stopper) 4b inserted into the cotter hole 4a, a cotter 4b and an upper frame 1a. And a hydraulic ram 4c provided between the upper surface and the upper surface. In FIGS. 1 and 2, the hydraulic ram 4c is provided directly on the upper surface of the upper frame 1a, but may be provided via a shim or the like.

The hydraulic ram 4c has a lower oil chamber 4d connected to the accumulator 6 by a main pipe 6a. On the hydraulic ram 4c side of the main pipe 6a, a first on-off valve 6b is provided.
A second on-off valve 6 is provided on the accumulator 6 side of the main pipe 6a.
e are provided in a state where they are always open. The hydraulic ram 4c is extended to the upper limit of the stroke by the hydraulic oil supplied from the accumulator 6 to the lower oil chamber 4d. The axial position of the upper frame 1a with respect to the fixing rod 3 is set by the upper limit of the stroke of the hydraulic ram 4c. The first opening / closing valve 6b is a valve for shutting off the hydraulic oil from the accumulator 6 when replacing the hydraulic ram 4c.

The accumulator 6 and the first on-off valve 6
A branch pipe 6c whose tip is open to the outside is provided in the main pipe 6a between the main pipe 6b and the main pipe 6a, and a supply / discharge valve 6d is provided in the middle of the branch pipe 6c in a state where it is always closed.

The lower stopper mechanism 5 fits into the male screw 5a provided at the lower end of the fixing rod 3, the flange 5b provided above the male screw 5a, and the male screw 5a. And a nut 5c which is pressed against the flange 5b and tightened. The axial position of the lower frame 1b with respect to the fixing rod 3 is set by the flange 5b and the nut 5c, and the axial position of the fixing rod 3 of the upper frame 1a by the upper stopper mechanism 4 is set by this setting. , Upper frame 1a and lower frame 1b
Is set.

The hydraulic cylinders 7 provided on both the left and right sides of the lower frame 1b have piston rods 7a which are connected to the upper frame 1a.
The upper and lower oil chambers are connected to a hydraulic pump via piping and a three-position switching valve (not shown), and the upper frame 1a is lifted and stopped by switching the three-position switching valve.

The horizontal roller apron segment constructed as described above is composed of a pair of frames 1 as follows.
Is set, the interval between the upper and lower rolls 2 is fixed.

That is, first, the nut 5c of the lower stopper mechanism 5 is tightened to fix the fixing rod 3 of the lower frame 1b.
Set the position for. Also, with the piston rod 7a of the hydraulic cylinder 7 contracted and the upper frame 1a lowered, the cotter 4b of the upper stopper mechanism 4 is inserted into the cotter hole 4a.
Insert Thereafter, the three-position switching valve (not shown) is switched to extend the piston rod 7a of the hydraulic cylinder 7, whereby the upper frame 1a starts to rise.

Thereafter, the hydraulic ram 4c, which has been extended to the stroke limit, is pressed against the cotter 4b, and the upward movement of the upper frame 1a stops, and at the same time, the upward movement of the piston rod 7a also stops. In this state, the supply and discharge of the hydraulic oil to and from the hydraulic cylinder 7 are shut off by switching the three-position switching valve (not shown) to the neutral position. This state is maintained during continuous casting. During the continuous casting operation, when it is detected that the slab has stopped in the horizontal roller apron due to a trouble such as breakout, the load applied to the upper frame 1a is released as follows.

The second on-off valve 6e is switched to a closed state, and the supply / discharge valve 6d is switched to an open state. By this operation, a part of the hydraulic oil existing in the main pipe 6a from the lower oil chamber 4d of the hydraulic ram 4c to the second on-off valve 6e is discharged from the supply / discharge valve 6d, and the operation in the hydraulic ram 4c is performed. The oil pressure decreases, and the hydraulic ram 4c contracts to the stroke limit.

FIG. 3 is a partially sectional front view showing a state where the hydraulic ram 4c is contracted to the stroke limit. As shown in the figure, when the hydraulic ram 4c contracts to the stroke limit, the hydraulic ram 4c moves away from the cotter 4b. Therefore, a load in the direction of pushing up is not applied to the cotter 4b, so that the cotter 4b can be easily removed from the cotter hole 4a.

Subsequently, the three-position switching valve (not shown) is switched to extend the piston rod 7a of the hydraulic cylinder 7, thereby raising the upper frame 1a. With the above operation, the load applied to the upper frame 1a is released.
The deformed slab is removed after being cut between the roller apron segments. When the processing of the deformed slab is completed, after supplying hydraulic oil from the supply / discharge valve 6d as necessary,
The supply / discharge valve 6d is closed. Thereafter, the operating oil is pressurized by the accumulator 6 to prepare for the next operation.

FIG. 4 is a partial cross-sectional front view illustrating another example of the horizontal roller apron segment, and the same parts as those in FIG. 1 are denoted by the same reference numerals. The horizontal roller apron segment shown in FIG. 1 includes a pair of frames 1 opposed to each other, a plurality of pairs of rolls 2 provided in the longitudinal direction of the frame 1, and fixed members provided at four corners of the frame 1. Rod 3, an upper stopper mechanism 4 provided at an upper end of the fixing rod 3, a lower stopper mechanism 5 provided at a lower end of the fixing rod 3, and an accumulator for supplying hydraulic oil to the upper stopper mechanism 4. 6 and a spacer 8 fitted on the outer periphery of each of the fixing rods 3 between the pair of frames 1.

A pair of frames 1, a plurality of pairs of rolls 2, a fixing rod 3, an upper stopper mechanism 4, and an accumulator 6 have the same structure as the horizontal roller apron segment shown in FIG.

The lower stopper mechanism 5 includes a male screw 5a provided at the lower end of the fixing rod 3 and a nut 5 which fits into the male screw 5a and is provided below the lower frame 1b.
c.

The spacer 8 has an upper frame 1a and a lower frame 1b corresponding to a required interval between the pair of rolls 2.
And has a length corresponding to the distance between the opposing surfaces of the fixing rods 3 and fits on the outer periphery of each fixing rod 3. In this horizontal roller apron segment, the nut 5c of the lower stopper mechanism 5 is removed, and the cotter 4b of the upper stopper mechanism 4 is inserted into the cotter hole 4a of the fixing rod 3 with the hydraulic ram 4c extended to the stroke limit. Thereafter, the nut 5c of the lower stopper mechanism is tightened. Thereby, the fixing rod 3 is pulled down, the cotter 4b is pressed against the hydraulic ram 4c extended to the stroke limit, the interval between the pair of frames 1 is set, and the interval between the upper and lower rolls 2 is fixed.

When releasing the load on the upper frame 1a, the hydraulic ram 4c is contracted to the stroke limit by switching the supply / discharge valve 6d to the open state, as in the case of FIG. Move away from 4b. Therefore, a load in the direction of pushing up is not applied to the cotter 4b, and the cotter 4b can be easily extracted from the cotter hole 4a. 5A and 5B are diagrams illustrating another example of the upper stopper mechanism. FIG. 5A is a front sectional view, and FIG. 5B is a top view. In the figure, an upper stopper mechanism 40 has a groove 40a formed in a direction perpendicular to the axis on an outer surface at two opposing upper ends of a fixing rod 3, and a U-shaped stopper 40b fitted in the groove 40a. , A hydraulic ram 4c provided between the stopper 40b and the upper surface of the upper frame 1a. The upper stopper mechanism 40 of this structure can be provided instead of the upper stopper mechanism 4 of the roller apron segment shown in FIGS. In the above description, the accumulator is provided for operating the hydraulic ram of the upper stopper mechanism, but a hydraulic motor may be provided instead of the accumulator. In addition, although the stopper mechanism provided with the hydraulic ram is provided at the upper part, it may be provided at the lower part or both. Further, although the stopper mechanism includes a hydraulic ram, a hydraulic ram may be used instead of the hydraulic ram.

In the above description, the horizontal roller apron segment has been described. However, the vertical roller apron segment and the curved roller apron segment may have the same structure.

[0030]

According to the roller apron segment of the present invention, there is provided a stopper mechanism having a stopper fitted to the fixing rod from a direction perpendicular to the axis thereof, and a hydraulic ram provided between the stopper and the frame. Therefore, when an excessive load is applied to the roller apron segment, the stopper can be easily pulled out by contracting the hydraulic ram, and the load can be released quickly with a simple structure.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view illustrating an example of a horizontal roller apron segment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a partial cross-sectional front view showing a state where the hydraulic ram shown in FIG. 1 has contracted to a stroke limit.

FIG. 4 is a partial cross-sectional front view illustrating another example of the horizontal roller apron segment of the present invention.

5A and 5B are diagrams illustrating another example of the upper stopper mechanism of the present invention, wherein FIG. 5A is a front sectional view and FIG. 5B is a top view.

FIG. 6 is a schematic view showing an example of a curved continuous casting apparatus.

[Description of Signs] 1 frame 1a upper frame 1b lower frame 1c through hole 2 roll 2a rotating shaft 2b bearing 3 fixing rod 4, 40 upper stopper mechanism 4a cotter hole 4b cotter (stopper) 4c hydraulic ram 4d lower oil chamber 5 Lower stopper mechanism 5a Male screw 5b Flange 5c Nut 6 Accumulator 6a Main piping 6b First open / close valve 6c Branch pipe 6d Supply / discharge valve 6e Second open / close valve 7 Hydraulic cylinder 7a Piston rod 8 Spacer 11 Tundish 12 Immersion nozzle 13 Tundish car 14 Mold 15 Roller apron 15a Vertical roller apron segment 15b Curved roller apron segment 15c Horizontal roller apron segment C Cast piece P Pass line

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Atsushi Murata 4-53-3 Kitahama, Chuo-ku, Osaka-shi, Osaka Sumitomo Metal Industries, Ltd. F-term (reference) 4E004 LA01

Claims (2)

[Claims] 1. A pair of frames each having a longitudinal direction parallel to a pass line and opposed to each other with the pass line interposed therebetween, and provided on a pair of opposing surfaces of the pair of frames, respectively. A plurality of rolls whose rotation axis is perpendicular to the longitudinal direction of the frame; fixing rods penetrating through four corners of the pair of frames; and fixing rods provided at both ends of the fixing rods. Equipped with a stopper mechanism,
A roller apron segment of a continuous casting apparatus for setting a distance between a pair of frames by the fixing rod and a stopper mechanism, wherein at least one of the stopper mechanisms is fitted to the fixing rod from a direction perpendicular to its axis. A roller apron segment of a continuous casting apparatus, comprising: a stopper; and a hydraulic ram provided between the stopper and the frame. 2. The roller apron segment according to claim 1, further comprising an accumulator for supplying a pressure medium to the hydraulic ram.