JP2002239698A - Roller apron in continuous caster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller apron in a continuous caster with which change of roller gap accompanied with inclination of a movable side frame can easily be performed in on-line during operation. SOLUTION: This roller apron in the continuous caster is provided with a fixed side frame and a movable side frame each having roller group and disposed facing each other through a guide shaft, rotating joints advancing/ retreating the movable side frame to/from the fixed side frame direction at the non-setting surface of the roller group in the fixed side frame, drive- transmitting devices connected with these rotating joints, a drive-transmitting shaft connected with both drive-transmitting devices and a motor for driving the drive-transmitting devices. Further, a clutch is arranged between the rotating joint and the drive-transmitting device and further, in the rotating joints at the inlet side and the outlet side, a detector for the number of rotation is provided for measuring the opening/closing quantity between the fixed side frame and the movable side frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller apron of a continuous casting machine, and more particularly, to a roller apron for a continuous casting machine.
The present invention relates to a roller apron of a continuous casting machine that sandwiches a steel slab that descends to a downstream process while solidifying, narrows the interval between rollers that support the slab according to the width shrinkage of the steel slab, and smoothes the downward movement.

[0002]

2. Description of the Related Art Molten steel smelted to a predetermined composition in a converter or the like,
Before rolling to a steel plate or steel material, it is cast into a steel slab (slab or the like) of a certain size. In recent years, a continuous casting machine has been frequently used for this casting, and attempts have been made to increase the production of steel slabs and reduce the production cost.

As an example of a continuous casting machine, as shown in FIG. 2, a molten steel 2 held in a ladle 1 is poured into a mold 4 via a tundish 3, and a cast slab 5 having a substantially external shape is formed. Is drawn downward from the mold 4 at a slow speed, cooled with water, solidified, moved downstream, and cut into a predetermined length to obtain a steel slab. Usually, the steel slab (hereinafter simply referred to as slab) is called a slab, a bloom, or the like, and has a rectangular cross section. It is supported by a pair of rollers and moved downward.

In the continuous casting machine, since the slab 5 is moved while being cooled as described above, a plurality of rollers are provided as a holding device for the slab 5 over a considerably long distance between the mold 4 and the drawing straightening machine 6.・ Equipped with an apron 7. About the roller apron, FIG.
FIG. 4 shows a plane of the movable frame and the cast piece, and FIG. 4 shows a side surface of the fixed frame without the roller group. That is, the movable side frame 9 having the roller group 8 and the fixed side frame 11 having the other roller group 8 sandwich the slab 5 and
The worm jacks 12 connected to one end of the guide shaft 10 are provided at the four corners of the roller group non-installation surface of the fixed side frame 11 with the Each worm jack is connected by an intermediate shaft 13, and the intermediate shaft 13 is connected to a reduction gear 15 by an electric motor 14.
The movable frame 9 is driven via the coupling 16, the universal joint 17, etc.
And the distance (roller gap) between the opposing roller groups 8 is changed (see FIG. 63).
157457, Japanese Patent No. 309119).

The slab 5 shrinks as the internal solidification progresses, so that the thickness of the slab decreases as it goes downward until solidification is completed. That is,
The slab 5 is tapered and has a so-called tapered shape. Therefore, it is necessary that the roller groups 8 disposed at positions facing each other to support the slab 5 not only narrow the roller gap, but also be driven to contact along the taper. Otherwise, the slab 5 does not move smoothly, and not only its outer shape but also its internal quality deteriorates. Therefore, conventionally, one universal joint was removed and the other universal joint was removed. The taper adjustment is performed by driving only the joint and changing the movable frame by the difference in the taper of the size. However, such a method has a problem in that it takes time to remove the universal joint and involves danger.

In order to solve this problem, Japanese Utility Model Laid-Open Publication No. 63-157457 discloses that a movable frame having a movable roll group and a fixed frame having a fixed roll group are arranged to face each other. A roller that connects a moving mechanism for moving the movable frame with respect to the fixed frame to the entrance side and the exit side of the side frame, and drives the entrance-side and exit-side moving mechanisms via a distributor by one driving device. In the apron, a friction clutch that causes slippage due to overload is provided between the dispensing machine and the entrance / exit-side moving mechanism, and the entrance / exit-side moving mechanism prevents the movable-side frame from moving and is movable. A roller provided with a distance piece (height setting jig) capable of setting a taper amount of the side roll group;
Apron] was proposed. That is, as shown in FIGS. 5 to 7, the distance pieces 18 corresponding to the taper amounts to be changed are attached to the entrance side and the exit side of the guide shaft 10, and the movable frame 9 is moved by the intermediate shaft 13. When one of the distance pieces 18 (for example, the entry side) hits, the friction clutch 19 slips, and the movement of the entry side is prevented. 19 slides to prevent movement on the exit side, and the taper amount is set.

[0007] If the same continuous caster produces only one cast piece, the movable frame 9 may be set so that a constant taper is formed. However, in an actual continuous casting machine, slabs having various slab thicknesses are manufactured depending on the purpose of use.
The case where the taper is changed also occurs.

[0008]

However, in the roller apron 7 described in Japanese Utility Model Application Laid-Open No. 63-157457, when the roller gap is to be narrowed down on-line during operation, the distance and the distance are reduced. The piece 18 must be replaced each time with a piece corresponding to the taper generated in the slab, and it is necessary to temporarily stop the operation, which lowers the productivity of the slab.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a roller apron of a continuous casting machine which can easily change a roller gap accompanying an inclination of a movable side frame during operation.

[0010]

Means for Solving the Problems The inventor has conducted intensive studies to achieve the above object and has embodied the results in the present invention.

That is, the present invention provides a fixed frame and a movable frame which are respectively provided with a roller group and are opposed to each other via a guide shaft, and the movable frame is provided on the non-roller group mounting surface of the fixed frame. A continuous joint comprising a rotary joint for moving the frame forward and backward in the direction of the fixed frame, a drive transmission device for connecting the rotary joints, a drive transmission shaft for connecting the drive transmission devices to each other, and an electric motor for driving the drive transmission device. In a roller apron of a casting machine, a clutch is provided between the rotary joint and the drive transmission device, and a rotational speed detection for measuring an opening / closing amount between a fixed frame and a movable frame is provided at the input and output rotary joints. A roller apron for a continuous casting machine, comprising a vessel. In this case, the rotary joint installed on the fixed side frame is a worm jack, and the rotation speed detector is an ABSOCODER, or the fixed side frame is outside the curved continuous casting machine R, and the movable side frame is R It is preferable to dispose inside.

According to the present invention, the clutch provided between the rotary joint on the slab entry side and the drive transmission device is disconnected, and only the rotary joint on the entry side or the output side can be driven. The movable frame can be moved forward and backward with the addition of the frame. Further, since the rotation speed of the rotary joint is measured by the rotation speed detector, the taper amount can be freely changed.
As a result, the roller gap with the inclination of the movable frame can be easily changed on-line during the continuous casting operation, thereby improving the quality and productivity of the steel slab.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 (a) and FIG. 1 (b) show a roller apron of a continuous casting machine according to the present invention. More specifically, FIG. 1A is a plan view including a slab 5, a roller group 8, a fixed frame 11, and a movable frame 9, and FIG. It is a side view which shows an installation surface. Accordingly, the slab 5 moves from the upper side to the lower side in FIG. 1B.

First, as is apparent from FIGS. 1 and 2, the fixed side frame 11 and the movable side frame 9 are arranged below the mold 4 with their surfaces substantially vertical. Both of them have four guide shafts 10 extending in the horizontal direction (FIG. 1A).
In this case, they are arranged so as to face each other with two lines overlapping. The fixed-side frame 11 and the movable-side frame 9 are each provided with a roller group 8 including a plurality of rollers. The slab 5 that has descended from the mold 4 has its long side surface sandwiched by the roller group 8. While supporting the pressure of molten steel that has not yet solidified, it moves further downward. In an actual operation, water or the like is sprayed on the slab 5 to promote its cooling. for that reason,
The slab 5 solidifies and shrinks as it goes downward, and the slab thickness decreases. That is, the shape has a taper. This taper amount depends on the steel type, size,
It depends on the casting speed. The present invention has developed a roller apron 7 that can operate while continuously adjusting such a taper amount having a large fluctuation online.

For this purpose, first, it is necessary to make the movable frame 9 movable toward and away from the fixed frame 11.
As shown in FIGS. 1 (a) and 1 (b), the reciprocation is performed by attaching a rotary joint 12 to one end of four guide shafts 10 provided with screws and driving the same. did.
In addition, the rotary joints 12 are provided so as to be connected to one end of the guide shaft 10 at the four corners of the fixed group frame 11 where the roller group is not installed. Further, in order to drive the rotary joint 12, two drive transmitting devices 21 (corresponding to what is referred to as a distributor 20 in the above-mentioned conventional technology) for connecting the two rotary joints 12 on the slab input side and the output side. And a drive transmission shaft 22 that connects these two drive transmission devices 21 to each other, and an electric motor 14 that drives the drive transmission device 21.

Next, in order to make the movable side frame 9 follow the taper generated in the slab 4, in the present invention, the rotary joint 12 (for example, a worm jack) and the drive transmission device 21 on the slab entry side are used. A clutch (for example, a mechanical type) 23 is provided between them so that the clutch 23 can be released. Thereby, the connection of the rotary joint 12 on the entrance side and the exit side can be cut off as needed, and only the entrance side or the exit side can be driven. For example, when changing the taper, the clutch on the input side may be disengaged, and the movable frame 9 may be advanced or retracted with respect to the fixed frame 11 only on the output side. At this time, the amount of change of the taper amount can be adjusted by examining in advance how much the movable frame 9 moves in one rotation of the rotary joint 12. Therefore, in the present invention, the fixed-side frame 1 is attached to the entrance-side and exit-side rotary joints 12.
A rotation number detector (for example, ABSOCODER) 24 for measuring an opening / closing amount between the movable frame 1 and the movable frame 9 is provided.

[0018]

EXAMPLE Molten steel (medium carbon steel containing 0.15% by mass of carbon) was cast using a curved continuous caster shown in FIG. 2 to produce a slab. At this time, the roller apron 7 according to the present invention is used.
And the thickness of the slab (in this case, slab) 5 was changed to 200 mm, 240 mm, and 310 mm online. In addition, the fixed side frame 11 was arranged outside the R of the continuous casting machine, and the movable side frame was arranged inside the R. This is because setting the curvature of the frame is easier.

The results of the operation were evaluated by the casting speed and the rate of occurrence of internal defects in the slab, and are shown in Table 1. From Table 1, it is clear that the roller apron 7 according to the present invention is much superior to the conventional roller apron (without taper). The slab internal defect occurrence rate was indicated by the rate of occurrence of internal cracks, and the defect occurrence rate that occurred when the casting speed was 1.9 m / min in the conventional apparatus was indicated as 1.

[0020]

[Table 1]

[0021]

As described above, according to the present invention, it is possible to easily change the roller gap accompanying the inclination of the movable side frame during the continuous casting operation, thereby improving the quality of the steel slab. Productivity improvements have been achieved.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams illustrating a roller apron of a continuous casting machine according to the present invention, wherein FIG. 1A is a plan view of a roller apron, and FIG. FIG.

FIG. 2 is a side view showing a general continuous casting machine.

FIG. 3 is a plan view of a conventional roller apron.

FIG. 4 is a side view showing a roller non-installation surface of a fixed frame in a conventional roller apron.

FIG. 5 is a view showing a position of a friction clutch attached to a conventional roller apron.

FIG. 6 is a plan view of a conventional roller apron.

FIG. 7 is a view showing a distance piece attached to a conventional roller apron.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ladle 2 Molten steel 3 Tundish 4 Mold 5 Slab 6 Slab 6 Pulling correction machine 7 Roller apron 8 Roller group 9 Movable frame 10 Guide shaft 11 Fixed frame 12 Rotary joint (for example, worm jack) 13 Intermediate shaft 14 Electric motor DESCRIPTION OF SYMBOLS 15 Reduction gear 16 Coupling 17 Universal joint 18 Distance piece 19 Friction clutch 20 Distributor 21 Drive transmission device 22 Drive transmission shaft 23 Clutch according to the present invention 24 Rotation speed detector (for example, Absocoder) 25 Moving mechanism

Claims (3)

[Claims] 1. A fixed frame and a movable frame which each have a roller group and are arranged to face each other via a guide shaft, and the movable frame is fixedly mounted on a non-roller group installation surface of the fixed frame. A rotary joint that moves forward and backward in the frame direction, and a drive transmission device that connects these rotary joints,
In a roller apron of a continuous casting machine including a drive transmission shaft connecting the drive transmission devices to each other and an electric motor for driving the drive transmission device, a clutch is provided between the rotary joint and the drive transmission device,
A roller apron for a continuous casting machine, wherein a rotational speed detector for measuring an opening / closing amount between a fixed frame and a movable frame is provided at a rotary joint on an inlet side and an outlet side. 2. A roller apron for a continuous casting machine according to claim 1, wherein a rotary joint installed on said fixed frame is a worm jack, and said rotation speed detector is an absorcoder. 3. The roller for a continuous casting machine according to claim 1, wherein the fixed frame is disposed outside the curved continuous casting machine R and the movable frame is disposed inside the curved continuous casting machine. apron.