JPS58221646A - Method for controlling spacing between partition wall and roll for cooling in continuous casting device for steel plate - Google Patents

Abstract

PURPOSE:To prevent automatically the leakage of molten steel from a continuous casting device of a twin roll type in said device, by detecting the rotating torque of rolls, moving a partition wall for supplying molten steel in accordance with the detected value thereof and regulating the spacing between said wall and the rolls. CONSTITUTION:Molten steel is supplied from a partition wall 3 as a vessel for molten steel provided with barrel sealing plates 4 and side sealing plates 5 to the spacing between two rolls 1 and 2 for cooling while said rolls are kept rotated to cast a steel plate continuously. The rotating torque of the roll 1, 2 is detected with a torque detector 11 of a motor 10 in this stage and is compared with a reference torque signal 13 in a comparing calculator 14. When the detected torque signal is smaller than the reference torque signal, the signal is fed to a servocontrol valve 16 which operates a cylinder 15 to bring the wall 3 closer to the rolls 1,2 thereby preventing the leakage of the molten steel from the spacing between the plates 4 of the wall 3 and the rolls 1, 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a continuous casting apparatus for steel plates in which molten steel is solidified and drawn out as a plate from the gap between two cooling rolls arranged horizontally and in parallel. This invention relates to a method for controlling the gap between the partition wall and the cooling roll, which automatically controls the gap between the seal between the partition wall and both rolls, which are located in the partition wall and which stores molten steel, to prevent leakage of molten metal. be.

Conventionally, the most common method for producing steel plates is a method in which slag produced by continuous slab casting is rolled 5 to 10 times or more to produce a thin plate.

However, this method consumes a large amount of rolling energy and heating energy to maintain the steel temperature during the rolling operation.

In order to reduce this rolling energy and heating energy, methods of directly casting steel plates from molten steel have been considered in recent years. This method can be roughly divided into the twin roll method and the belt method.The belt method attempts to make a plate on a belt, so it is difficult to obtain belt material that can be mixed with high-temperature molten steel, and the heat of the belt is difficult to obtain. It is difficult to make a flat plate due to distortion. On the other hand, the twin roll method attempts to make a plate by placing two rolls parallel to each other and pouring the molten metal into the gap between the rolls, which does not have the drawbacks of the belt method and is easier to manufacture. It's relatively easy.

However, in the above-mentioned twin-roll type continuous steel plate casting apparatus, a barrel seal plate 4 and a side seal are placed on one side of the roll gap between the cooling rolls 1 and 2, which are arranged vertically and horizontally in parallel, as shown in FIG. The molten steel in the partition wall 3 is collected on the surface of the cooling rolls 1 and 2. Since it is solidified to form a solidified layer and pulled out as a plate, the gaps between the rolls 1 and 2 and the barrel seal plate 4 and the rolls 1 and 2 and the side seal plate 5 are
Molten steel may leak from the gaps between the parts. Therefore, it is necessary to seal such gaps.

The present invention attempts to prevent molten steel from leaking by sealing the gap between the roll and the barrel seal plate among the above-mentioned gaps, and reduces the rotational torque of the roll, which changes depending on the opening degree of the gap. This method attempts to control the gap between the partition wall and the cooling roll by mechanically moving the partition wall based on the magnitude or smallness of the detected torque.

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

As shown in FIGS. 2 and 3, a partition wall 3 consisting of a barrel seal plate 4 and a side seal plate 5 is arranged close to the gap between the cooling rolls 1 and 2 arranged vertically and horizontally in parallel. In this structure, a plurality of burners 8 and cooling air blowing nozzles 9 are arranged on the outside of the tip of the barrel seal plate 4, and the tip of the barrel seal plate 4 is heated by the burner 8, and air blows from the nozzle 9. Enable cooling by cooling air.

The upper and lower cooling rolls 1 and 2 can be rotated by a drive motor 10, and the rotational torque of the rolls 1 and 2 can be detected by a torque detector 11 of the motor 10, and this detection signal 12 is generated when the rolls 1° It is compared with the rotational torque reference signal 13 of No. 2 in the comparator 14, and if there is a difference,
The deviation signal is sent to the servo valve 16 of the moving cylinder 15 of the partition wall 3. 18 is a thermocouple, and 19 is a gear.

The molten steel in the partition wall 3 is solidified on the surfaces of the cooling rolls 1, 2 by rotation of the cooling rolls 1.2, a solidified layer 20 is formed, and the molten steel is taken out as a plate from between the rolls 1.2. During this time,
Molten steel 17 within the partition wall 3 tends to leak from the gap between the rolls 1 and 2 and the barrel seal plate 4 of the partition wall 3. The surface tension of molten steel, the rolls 1 and 2, and the barrel seal plate 4
In relation to the width of the gap between roll l.

2 and the tip of the barrel seal plate is possible, but it cannot be maintained for a long time.

Therefore, in the present invention, the rolls 1 and 2 of the barrel seal plate 4 are
A solidified layer 21 of molten steel is formed on the side end faces of the rolls 1 and 2.
In order to automatically control the gap between the cylinder 15 and the barrel seal plate 4, the torque of the roll is detected and the partition wall 3 is connected to the cylinder 15.
The gap is changed by mechanically moving the gap.

To form the solidified layer 21, cooling air is blown onto the barrel seal plate 4 from the nozzle 9 so that the fW degree of the tip #a of the barrel seal plate 4 relative to the rolls 1 and 2, that is, the sealed portion, is slightly lower than the melting point. By applying this, a coagulated layer 21 can be formed on the sealing surface of the barrel seal plate 4 as shown in FIG. This solidified layer 21 grows during the operation of continuous steel sheet casting. Therefore, if the gap between the rolls 1, 2 and the barrel seal plate 4 is set constant, the gap will be narrowed due to the growth of the solidified layer 21, and the rotational torque of the rolls 1, 2 will change.

The torque is detected by the torque detector 11 of the motor 10, inputted to the comparator 14, and compared there with the reference torque signal 13 at a constant gap. When the value of the detected torque signal 12 is larger than the reference signal 13, the signal is sent to the servo valve 16 to move the cylinder 15 backward and move the entire partition wall 3 away from the rolls 1 and 2. This increases the gap between the rolls 1, 2 and the barrel seal plate 4. At the same time, if the seal portion of the barrel seal plate number is heated by the burner 8, the coagulated layer 21 that has been formed can be melted and the gap can be enlarged.

After changing the gap as described above, the torque is detected again and compared with the reference signal 13, and when the difference becomes zero, the operation of the cylinder 15 is stopped, and the cylinder 15 is heated by the burner 8. When this happens, stop this heating.

The rotational torque of the roll is constantly detected, and the detected torque signal is compared with a reference signal, and if the detection signal 12 is smaller than the reference signal 13, the cylinder 15 is operated in the forward direction. As a result, the gap between the rolls 1, 2 and the barrel seal plate 4 is changed to become narrower.

In addition, in the embodiment, a case is illustrated in which the cooling rolls 1 and 2 are arranged above and below, the partition wall 3 is arranged horizontally, and the partition wall 3 is covered, but the invention is not limited to this. Instead, the same applies to a type in which the cooling rolls 1 and 2 are arranged horizontally and the partition wall 3 is arranged upward or downward.

As described above, according to the method of the present invention, the rotational torque of the roll is detected and if the torque is large, the gap between the cooling roll and the barrel seal plate of the partition wall is mechanically changed. Change of the gap is stopped when there is no difference between the torque detection signal and the reference signal, and the gap is automatically controlled according to the torque, so there is no possibility that the gap will become too large and molten steel will leak out. Therefore, the molten steel can always be kept in the gap and sealed so that it does not leak out.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view of a continuous casting apparatus for steel sheets, Fig. 2 is a schematic diagram showing an embodiment of the method of the present invention, and Fig. 3 is a partially enlarged view showing the interspace between the roll and the barrel seal plate. be. 1.2... Cooling roll, 3... Compartment wall, 4...
Barrel seal plate, 10... Drive motor, 11...
Torque detector, 14... Comparison calculator, 15... Cylinder. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1) In a continuous steel sheet casting device, a partition wall as a pool is positioned in the gap between two cooling rolls, and a steel sheet is cast while forming a solidified layer of molten steel on the roll surface.
comprising a device for detecting the rotational torque of the roll, comparing the signal from the torque detection device with a reference torque signal when the gap between the seal portion between the roll and the partition wall is constant;
If there is a difference, the gap is changed by mechanically moving the partition wall, and the gap is changed until there is no difference between the torque detection signal and the reference signal. Gap control method.