JPH0730200Y2 - Slab reduction device for continuous casting equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a device for lightly reducing a cast piece in a continuous casting facility.

[Conventional technology and its problems]

As is well known, the main part of a general continuous casting equipment is composed of a tundish 1, a mold 2, a secondary cooling zone 3, a pinch roll 4 and a cutting device 5, as shown in FIG. Molten steel 6 is poured into a tundish 1 from a ladle (not shown), and the molten steel 6 is poured into a mold 2 through a nozzle (not shown). Form. The slab 7 having the thinned solidified shell is further cooled in the secondary cooling zone 3 composed of the spray nozzle and the guide roll, and is pulled out by the pinch roll 4.

Here, the pinch roll 4 is usually fixed on one side and the hydraulic cylinder 8 on the opposite side.
The pressure is applied to the cast slab 7 with a constant pressure (see, for example, Japanese Utility Model Publication No. 56-41877 and Japanese Utility Model Publication No. 58-19000). In this case, when the roll rotates, a pressure that does not slip on the surface of the slab 7 is required,
This pressure is usually not large enough to cause the slab 7 to deform.

However, recently, the rolling roll 4 has been used to positively apply a reduction amount to improve the internal quality of the slab 7.

That is, for example, as shown in FIG. 4 (a), the hydraulic cylinder 8 is attached to the pinch roll 4a on one side, the pinch roll 4b on the other side is fixed, and the hydraulic cylinder 8 is actuated to move these pinch rolls 4a. , 4b are also used as rolling rolls to positively apply the reduction to the slab 7.

However, the pinch roll 4 with the hydraulic cylinder 8
Then, for example, as shown in the same figure, if the amount of reduction Δh is applied to the slab 7, the slab 7 is bent toward the pinch roll 4b on the fixed side by the amount of Δh. Further, if the cast slab 7 is not bent as shown in FIG. 4 (b), only one side of the cast slab 7 is rolled down, and the rolling effect is halved. Therefore, when the cast slab 7 is bent with a reduction amount of Δh as shown in FIG. 4 (a), internal cracks or the like may occur in the cast slab 7, which may deteriorate the internal quality of the cast slab 7.

On the other hand, a proposal as disclosed in Japanese Utility Model Publication No. 56-41876 is also proposed as a side guide roll moving device in a continuous casting facility. This is provided with a double rack and one fixed position self-rotating pinion that meshes with these racks, a so-called double rack-pinion device, and one rack is connected to a hydraulic cylinder and via an arm. It is connected to the roll chock of one side guide roll. The other rack is in contact with another roll chock. Therefore, when the hydraulic cylinder is operated, the side rolls, which are placed on the left and right, are connected via the double rack-pinion device.
They can be operated simultaneously and can always be moved to the same position with respect to the center.

However, such a side guide roll moving device is
When applied to a light reduction device for cast slab, it is difficult to move the pair of rolling rolls to the center with their axes kept parallel to each other, because the reduction is performed by the hydraulic cylinder and the amount of reduction is increased.

[Means for Solving the Problems]

Therefore, the present invention has been devised in order to completely solve the problems of the prior art, and the gist of the present invention is to use rolling rolls that are arranged in the latter stage of the spray zone and are opposed to each other. In a slab light rolling device for rolling a slab, one roll chock of the rolling roll pair is integrally connected to a first hydraulic cylinder and one rack of a double rack-pinion device, respectively, The roll chock is slidably supported by a movable frame slidably supported by a roll stand, and the other roll chock of the pair of rolling rolls is fixed in the movable frame, and the movable frame is fixed to the movable frame. Heavy rack-second controlled in synchronization with movement of the other rack of the pinion device
It is a device for lightly reducing slab in a continuous casting facility, which is characterized in that it is connected to the hydraulic cylinder.

〔Example〕

The structure of the present invention, together with its operation, will be described in detail with reference to an embodiment implemented in a rigid continuous casting facility shown in the accompanying drawings.

FIG. 1 is a side view of an embodiment of the present invention, and FIG. 2 is a main part view of FIG. The same parts as those in the conventional example shown in FIGS. 3 and 4 are designated by the same reference numerals, and the description thereof will be omitted.

In these figures, the rolling roll is arranged at a position where molten steel is not completely solidified.
Is attached to its roll chock 9a, which is the piston rod 10a of the first hydraulic cylinder 10.
And is slidably supported in the movable frame 11. The first hydraulic cylinder 10 itself is fixedly installed in the movable frame 11.

The other rolling roll 4b is attached to the roll chock 9b, and the roll chock 9b is fixed in the movable frame 11.

The rolling rolls 4a and 4b may be independent rolling rolls, but may also be used as pinch rolls as shown in FIG.

The roll chock 9a is connected via an arm 12 to one rack 13a of the double rack-pinion device 13. This rack 13a meshes with a pinion 14 which is rotatable at a fixed position, and this pinion 14 meshes with another rack 13b. The other rack 13b is supported by bearings 15, 15 attached to the roll stand 21. Further, one end of the mechanical servo valve is connected to a hydraulic power source (not shown).
It is connected to 17 spools 16. The mechanical servo valve 17 is attached to the movable frame 11 via a stand 18, and the mechanical servo valve 17 communicates with a second hydraulic cylinder 20 via hydraulic hoses 19 and 19.

The second hydraulic cylinder 20 is attached to one end of the movable frame 11, and its piston rod 20a is in contact with the fixed roll stand 21. This roll stand
The movable frame 11 is slidably fitted in the window frame 22 of 21.

Next, the operation of this embodiment will be described.

When a predetermined hydraulic pressure is applied to the first hydraulic cylinder 10 from a hydraulic source (not shown) in order to give a predetermined amount of reduction to the slab 7, the piston rod 10a of the cylinder 10 extends,
As a result, in the mechanism of the present embodiment, both the cylinder and piston mechanisms expand (for example, Δ2h as described later), and forces are exerted in the opposite directions, so that the cast slab 7 is passed through the pinch rolls 4a and 4b. In FIG. 1, pressure (pressure reduction) is applied from both left and right sides.

At this time, when the left and right properties (such as hardness) of the slab 7 are the same,
The extension of the first hydraulic cylinder 10 causes the piston rod 10
A movable frame supporting the first hydraulic cylinder 10 and the pressure applied to the pinch roll 4a from the roll chock 9a.
Since the pressure applied from 11 to the pinch roll 4b via the roll chock 9b is equal, when the right side of the slab 7 is reduced by Δh, the left side of the slab 7 is also reduced by Δh, and the first hydraulic cylinder 10 extends by Δ2h. . That is, since the roll chock 9a is slidable with respect to the movable frame 11, it slides Δh to the left in the figure, but the roll chock 9b is substantially integrated with the movable frame 11, so the movable frame 11 itself is shown in the figure. Move toward Δh.
In other words, the first hydraulic cylinder 10 extends (by Δ2h) as much as the distance between the rolls 4a and 4b decreases by Δ2h.

At this time, the rack 13a connected to the roll chock 9a via the arm 12 also moves Δh to the left in the figure, and the rack 13b meshing with the rack 13a via the pinion 14 moves Δh to the right in the figure. As described above, since the movable frame 11 also moves Δh to the right side in the figure, the mechanical servo valve 17 supported via the stand 18 also moves Δh to the right side in the figure, so that the spool 16 connected to the rack 13b and the mechanical frame. Since the servo valve 17 moves integrally to the right in the figure, the mechanical servo valve 17 does not act. Therefore, the second hydraulic cylinder 20 does not substantially act, and only expands following the movement of the movable frame 11.

On the other hand, when the right and left properties of the slab 7 are different, for example, when the right side is softer than the left side in the drawing, when the predetermined hydraulic pressure is applied to the first hydraulic cylinder 10 as described above, the softer side is rolled down. Since it is easy, the roll chock 9a first moves Δh to the left in the figure by the extension of the hydraulic cylinder 10. At this time, the roll chock 9b does not move, or even if it moves, the amount of movement is smaller than Δh. Therefore,
One rack 13a connected to the roll chock 9a via the arm 12 is moved leftward in the figure by Δh. as a result,
The pinion 14 is rotated by meshing, and the other rack 13b is moved to the right by Δh in the figure.

Since the spool 16 is integrally connected to the rack 13b, the spool 16 also moves Δh to the right in the drawing, but as described above, the roll chock 9b (movable frame 11) does not move or even if it moves. Since the moving amount of the mechanical servo valve 17 supported by the movable frame 11 and the spool 16 is different because it is smaller than Δh, the mechanical servo valve 17 is opened and a predetermined hydraulic pressure is applied to the second hydraulic cylinder 20. . This hydraulic pressure is set to a pressure sufficient to pressurize the hard cast piece 7. As a result, the extension of the piston rod 20a forcibly moves the movable frame 11 to the right side in the figure by Δh to the right side, and the pinch roll 4b on the left side makes the Δ relative to the slab 7.
h Apply pressure reduction.

As a result, the movement amount of the spool 16 that has moved to the right side in the figure together with the rack 13b becomes equal to the movement amount of the mechanical servo valve 17 supported by the movable frame 11 to the right side in the figure, and the mechanical servo valve 17 is closed again. . At this time, since the predetermined hydraulic pressure is constantly applied to the first hydraulic cylinder 10, the first hydraulic cylinder 10 is extended (Δ2h) to absorb the movement amount of the movable frame 11 to the right in the figure, and thus the movable frame 11 is movable. The movement of the frame 11 does not move the pinch roll 4a (roll chock 9a) to the right in the figure.

It should be noted that, although the second embodiment has described that the second hydraulic cylinder 20 is controlled via the mechanical servo valve 17, the present invention is not limited to this, and a sensor detects the movement amount of the first hydraulic cylinder. The second hydraulic cylinder may be controlled.

[Effect of device]

According to the present invention, the movement of one of the rolling rolls with hydraulic cylinders in the opposite rolling rolls controls the movement of the other rolling roll with hydraulic cylinders through the double rack-pinion device. Is always given the same amount of reduction. Therefore, a bending action does not occur in the cast slab and the internal quality of the cast slab is not deteriorated.

Further, since the rolling rolls opposite to each other slide using the movable frame and the roll stand as guides, these rolling rolls can move while maintaining their axes parallel to each other. Can be made large, which is suitable for a light reduction device for cast slab.

[Brief description of drawings]

1 is a side view of an embodiment of the present invention, FIG. 2 is a schematic view of FIG. 1, FIG. 3 is a schematic view of a conventional example, and FIG. 4 is an explanatory view of the conventional example. 4a, 4b …… Rolling roll (pinch roll), 7 …… Slab, 9
a, 9b …… Roll chock, 10,20 …… hydraulic cylinder, 1
1 ... Movable frame, 13 ... Double rack-pinion device, 21 ...
… Roll stand, 22 …… Window frame.

Claims (1)

[Scope of utility model registration request] 1. A spray zone disposed downstream of the spray zone, and
In a slab light rolling device for rolling a slab by a pair of rolling rolls, a first hydraulic cylinder and one rack of a double rack-pinion device are respectively provided in one roll chock of the rolling roll pair. While integrally connected, the roll chock is slidably supported by a movable frame slidably supported by a roll stand, and the other roll chock of the rolling roll pair is fixedly provided in the movable frame, A device for lightly reducing a cast piece in a continuous casting facility, wherein the movable frame is connected to a second hydraulic cylinder that is controlled in synchronization with the movement of the other rack of the double rack-pinion device.