JP2528184Y2 - Slab support and guide device in continuous casting equipment - Google Patents

Description

The present invention relates to a slab support and guide device in a continuous casting facility configured to continuously pull and transport a slab such as a slab from a mold.

FIG. 4 is a partially cutaway front view showing a slab supporting and guiding device in a conventional continuous casting facility. In the drawing, reference numerals 1 and 2 denote a pair of upper and lower slab supporting and guiding rolls arranged in parallel with each other so as to face both side surfaces of the slab to be drawn from the mold. To 6 pairs are provided. The lower roll 2 of each pair is rotatably supported by a lower fixed frame 6 via a bearing box 4 and is fixed in position. The upper roll 1 of each pair is rotatably supported on an upper frame 5 via a bearing box 3.

Reference numeral 7 denotes a vertical column for connecting and supporting the upper and lower frames 5 and 6, and a total of four columns are arranged in pairs on the left, right, front and rear in the drawing and moving direction of the slab. The lower end of each of these columns 7 is fixed to the lower fixed frame 6, and the upper roll 1 and the upper frame 5 are fixed at the upper end to the lower fixed roll 2 and the lower fixed frame 6 in the vertical direction. An elastic buffering mechanism 8 for holding the elastically displaceable member within the range is provided.

The elastic buffering mechanism 8 is provided at the upper end of the column 7 at a small diameter shaft portion.
A nut body 9 screwed into the male screw portion 7B formed in 7A, an upper spring receiver 10 positioned by the nut body 9,
A lower spring receiver which is disposed opposite the lower part of the spring receiver 10 and is positioned by the bottom plate 5A of the upper movable frame 5
11 and fitted on the upper end small diameter shaft portion 7A of the column 7,
It is composed of a plurality of disc springs 12 interposed between the lower spring receivers 10 and 11 in a stacked state, and most of them are housed in a space 5B of an upward opening formed in the upper movable frame 5.

The four or six pairs of slab supporting and guiding rolls 1, 2
Among them, a pair of upper and lower rolls 1, 2 disposed at the center in the slab pulling movement direction are configured to be rotatable for driving, and the remaining rolls 1, 2 are all configured to be freely rotatable, and A hydraulic cylinder 13 for raising and lowering the pair of drive rolls 1 and 2 is mounted on the upper movable frame 5.

In the slab supporting and guiding apparatus in the conventional continuous casting facility having the above-described configuration, the interval between the pair of upper and lower rolls 1 and 2 is mechanically held by the elastic buffer mechanism 8, so that, for example, the thickness of the slab is changed. With respect to a load variation within a certain range, the upper movable frame 1 and the upper movable frame 5 elastically displace in the vertical direction due to the contraction and extension of the disc spring 12 in the elastic buffer mechanism 8 to exhibit a buffer function. Rolls 1 and 2 and bearings in bearing boxes 3 and 4 are protected from being damaged or deformed by load fluctuation.

Although not shown, the upper frame supporting the upper roll is driven up and down with respect to the lower fixed frame supporting the lower roll via a hydraulic cylinder such as a hydraulic pressure so that the distance between the upper and lower rolls can be increased by the hydraulic pressure. A slab supporting and guiding device configured to be held by a clamping force of a cylinder is also conventionally known.

Problems to be Solved by the Invention By the way, in a continuous casting facility, when a casting trouble such as breakout occurs, a means for automatically stopping the operation is generally adopted, but when the casting trouble occurs, the operation is stopped. Then, the slab is supercooled and the effect of the static pressure expands. This expanded supercooled slab is
Since it is a defective product, it is necessary to pass it between a pair of upper and lower rolls and extract it. At this time, for example, a load within 100 tons usually becomes an abnormal load of 200 tons or more.

When such an abnormal load is applied, in the conventional slab supporting and guiding apparatus having the structure as shown in FIG. 4, the disc spring 12 in the elastic damping mechanism 8 comes into close contact with or close to it, and the expected damping is no longer required. There has been a problem in that the function cannot be exhibited, and it is difficult or impossible to extract the slab.

Further, in the case of another conventional slab supporting and guiding apparatus of the type in which the interval between the upper and lower rolls is maintained by the clamping force of the liquid pressure cylinder, although the above-mentioned problem at the time of stoppage of operation can be solved, the fluid pressure and Since complicated and troublesome maintenance such as maintenance of fluid quality and checking for fluid leakage from fluid hoses and valves is required, and the frequency of such maintenance is high, it is not preferable as an accessory for a continuous casting facility.

An object of the present invention is to provide a slab supporting and guiding apparatus in a continuous casting facility that can solve the above-mentioned problems.

Means for Solving the Problems In order to achieve the above object, the slab supporting and guiding device in the continuous casting facility of the present invention is provided at least in parallel with each other so as to face both side surfaces of the slab to be drawn from the mold. Among the pair of slab support guide rolls, one of the rolls is fixed in position, and the other roll is elastically displaceable with respect to the fixed roll within a certain range in a direction orthogonal to the slab pull-out direction. An upper end of a column connecting a fixed frame for supporting the fixed roll to a movable frame for supporting a movable roll via a cylinder device, and the movable frame; And a fluid pressure cylinder for changing the interval between the pair of rolls.

According to the above-described configuration, with respect to a load variation within a certain range due to a change in the thickness of the slab during normal continuous casting, the movable roll and the movable frame are connected to the fixed roll and the fixed frame via the elastic buffer mechanism. And elastically displaces in the near and far directions with respect to, exerts a predetermined buffer function, and holds rolls and roll bearings. In addition, when a casting trouble occurred and the operation was stopped, by operating the fluid pressure cylinder to change the pair of rolls to be larger than usual, the operation was supercooled and expanded due to the operation stop. Even a supercooled cast slab can be extracted by passing it smoothly between a pair of rolls. Further, when the operation is stopped, the fluid pressure in the fluid pressure cylinder can be controlled by a small force from the supercooled slab so that the elastic buffer mechanism exhibits a predetermined buffer function.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In FIG. 1, reference numeral 14 denotes a mold, and an arc-shaped transport path A for guiding a slab drawn vertically from the mold 14 in a horizontal direction is formed below the mold. One pass line 15 is connected.

Reference numerals 16a to 16n denote roll segments (slab support guide devices) arranged in a row so as to constitute the transport path A. These roll segments 16a to 16n have the same structure, respectively. It is configured as shown in FIG.

In FIG. 2, 1 to 13 and 5A, 5B, 7A, 7B are the same as the components of the conventional example shown in FIG. 4, and therefore, the corresponding parts are denoted by the same reference numerals and detailed description thereof will be omitted. I do.
4 is different from the conventional example shown in FIG. 4 in that a hydraulic cylinder (an example of a fluid pressure cylinder, which is an example of a fluid pressure cylinder) is provided between the top surface of the upper end small diameter shaft portion 7A of the column 7 and the upper movable frame 5.
(Also referred to as a hydraulic jack) 17.

That is, as clearly shown in FIG. 3, a cylindrical member 18 having a downward opening is fixedly connected to the upper plate 5C of the upper movable frame 5 by being connected to the storage space 5B of the elastic buffering mechanism 8. The lower surface of the movable piston rod 17A of the hydraulic cylinder 17 fixed to the top plate 18A of the cylindrical member 18
The upper end of the small-diameter shaft portion 7A is in contact with the top surface, and by extending and contracting the hydraulic cylinder 17, the interval between the pair of upper and lower rolls 1 and 2 can be freely changed.

 Next, the operation of the above configuration will be described.

The slab drawn vertically from the mold 14 is continuously conveyed along the conveying path A constituted by the roll segments 16a to 16n and guided in the horizontal direction, and is then taken over by the slab pass line 15. . In such a normal continuous casting, the movable roll 1 and the movable frame 5 are elastically displaced in the vertical direction via the elastic buffer mechanism 8 in response to a load variation within a certain range due to a change in the thickness of the slab or the like. It absorbs and alleviates the impact caused by normal load fluctuation. This protects the upper and lower rolls 1, 2 and the bearings in the bearing boxes 3, 4, and the like.

In the above continuous casting, when the operation is stopped due to the occurrence of a casting trouble, the hydraulic cylinder 17 is extended to move the upper movable frame 1 and the upper movable roll 2 through the cylindrical member 18 to move the upper movable frame 1 and the upper movable roll 2 as shown in FIG. As shown by the imaginary line, the distance between the upper and lower rolls 1 and 2 can be made larger than the normal distance by raising the elastic buffer mechanism 8 against the elastic force of the disc spring 12. As a result, even a slab that has been supercooled due to the stoppage of operation and has expanded under the influence of static pressure can be smoothly passed between the upper and lower rolls 1 and 2 and extracted to the downstream side.

Further, when the operation is stopped as described above, when a small force exceeding a certain level is applied to the upper and lower rolls 1 and 2 held at a normal interval from the supercooled cast slab, a predetermined buffer is provided by the elastic buffer mechanism 8. The above hydraulic cylinder
It is also possible to control the supply oil pressure to 17.

In the above embodiment, the roll segment 16a
16n are provided with four to six pairs of upper and lower rolls 1 and 2 along the moving direction of the slab, but a large number of roll segments having only a pair of upper and lower rolls 1 and 2 are described. The pair of upper and lower rolls 1 and 2 may be drive rolls that can freely rotate or may be free rolls that can freely rotate.

As described above, according to the present invention, when a casting trouble occurs and the continuous casting operation is stopped, the interval between the pair of upper and lower rolls can be made larger than the interval during normal operation. In addition, even a cast piece expanded by static pressure can be easily and smoothly extracted by passing between a pair of upper and lower rolls.

In addition, at the time of normal continuous casting, since the interval between a pair of upper and lower rolls is mechanically held by an elastic buffering mechanism, complicated and troublesome maintenance such as holding by a clamping force of a fluid pressure cylinder is unnecessary, Maintenance of the equipment is easy.

Note that the fluid pressure cylinder in the configuration of the present invention is not always used, but is used only at the time of an emergency stop.

[Brief description of the drawings]

1 to 3 show one embodiment of the present invention. FIG. 1 is a schematic side view of the entire equipment, FIG. 2 is a partially cutaway front view of a roll segment, and FIG. FIG. 4 is a partially cutaway front view of a conventional slab supporting and guiding apparatus. DESCRIPTION OF SYMBOLS 1 ... Movable roll, 2 ... Fixed roll, 5 ... Movable frame, 6 ... Fixed frame, 7 ... Column, 8 ... Elastic cushioning mechanism, 12 ... Disc spring, 14 ... Mold, 16a-16n …
... Roll segment (slab support guide), 17 ... Hydraulic cylinder (fluid pressure cylinder).

Claims (1)

(57) [Scope of request for utility model registration] An at least one pair of at least one pair of slab supporting and guiding rolls disposed parallel to each other so as to oppose both side surfaces of a slab to be drawn out of a mold and to fix the position of the other roll. In a slab supporting and guiding apparatus in a continuous casting facility having an elastic buffering mechanism for holding the slab elastically displaceable within a certain range in a direction orthogonal to the slab pull-out direction with respect to the fixed roll, the fixed roll is supported. A fluid pressure cylinder for changing the interval between a pair of rolls is interposed between the upper end of the column connecting the fixed frame and the movable frame that supports the movable roll via a cylinder device, and the movable frame. Slab support and guide device in continuous casting equipment.