JPH0634035Y2 - Cooling device for mold rolls in continuous casting equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mold roll cooling device in a continuous casting facility.

Conventional technology In a continuous casting facility equipped with a twin roll type mold that pulls out a slab from a pair of left and right mold rolls, a mold roll that directly contacts molten steel to form a shell is
Conventionally, a cooling flow path is provided inside, and cooling water is sent to this cooling flow path for cooling.

However, it is impossible to sufficiently lower the surface temperature of the mold roll by the above cooling from the inside, which adversely affects the properties of the slab and the drawing speed.

Therefore, it is conceivable to inject cooling water directly onto the outer peripheral surface of the mold roll to cool it, but with such a cooling method, molten steel may come into contact with the mold roll surface while water remains, so that vapor explosion or the like may occur. There is danger.

It is an object of the present invention to solve the above problems and provide a mold roll cooling device in a continuous casting facility that can cool the surface of the mold roll safely and effectively.

Means for Solving the Problems In order to solve the above problems, the present invention provides continuous casting in which molten steel is supplied between a pair of left and right mold rolls arranged in parallel with each other to continuously draw out a slab from between the mold rolls. In the equipment for cooling the mold roll in the equipment, a pair of guide rollers that are rotatable around an axis parallel to the mold roll are arranged at positions that are close to the outer periphery of the mold roll on the side opposite to the molten steel contact part and are spaced at appropriate intervals. And a tension roller that is positioned outside between the pair of guide rollers and is biased outward, and the surface of the mold roller between the pair of guide rollers is in close contact with the mold roller. An endless metal belt is rotatably wound, and a spray nozzle for spraying cooling water is provided on the back surface of the metal belt between the pair of guide rollers. is there.

Action According to the above configuration, since the surface of the mold roll is cooled by the cooling water from the spray nozzle through the metal belt that is in close contact with the surface of the mold roll between the pair of guide rollers, the molten steel is transferred to the surface layer of the mold roll. Immediately after that, the generated heat can be quickly and effectively removed from the surface via the metal belt on the opposite side of the molten steel contact portion, and the surface temperature of the mold roll can be sufficiently lowered to optimize the properties of the slab and the drawing temperature. In addition, the mold roll can be cooled safely and effectively without contacting the molten steel with water remaining on the surface.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, 1 is a pair of left and right mold rolls arranged in parallel with each other at a predetermined interval in a thin plate continuous casting facility, and charged into a molten steel weir 2 arranged above the mold rolls 1. The molten steel 3 thus drawn is continuously drawn downward as a cast piece 5 from the mold outlet 4 between the mold rolls 1 by rotating the mold rolls 1 in the arrow A direction. Since both mold rolls 1 form the shell of the slab 5, although not shown, they have cooling water passages through which cooling water is sent and are cooled from the inside.

Reference numeral 6 denotes a surface cooling device for the mold roll 1 which is disposed outside the both mold rolls 1 in the outer peripheral portion not in contact with the molten steel 3. A lower guide roller 8 is disposed below the mold roll 1 in parallel with and close to the mold roll 1, and a tension is provided in parallel with the upper and lower guide rollers 7 and 8 behind the upper and lower guide rollers 7 and 8. The roller 9 is disposed by being urged outward by the tension cylinder 10. An endless metal belt 11 made of, for example, a thin copper plate and wider than the mold roll 1 is wound between the upper and lower guide rollers 7 and 8 and the tension roller 9, and the metal belt 11 is tensioned by the tension roller 9. The surface of the upper and lower guide rollers 7 and 8 is in close contact with the mold roll 1. A plurality of air mist nozzles 12 for injecting mist-like cooling water toward the metal belt 11 in the close contact portion are provided on the back surface side of the close contact portion of the metal belt 11 with the mold roll 1. Is configured to cool the surface of the mold roll 1 via the. Reference numeral 12a is a supply pipe for supplying cooling water and compressed air to the air mist nozzle 12. Here, the reason why the air mist nozzle 12 is adopted is to make the particles of the cooling water small so as to be easily vaporized.

Furthermore, the tension roller 9 and the tension cylinder
Each member other than 10 and the metal belt 11 of the mold roll 1
The portion closely attached to is covered with a cover body 13. The cover body 13 is hermetically sealed by attaching rubber seal plates 14 and 15 to the sliding contact portion with the mold roll 1 and the penetrating portion of the metal belt 11, and connecting the cooling water recovery pipe 16 to the bottom portion. The cooling water and water vapor sprayed from the nozzle 12 can be collected. Further, among the upper and lower guide rollers 7 and 8 and the tension roller 9, for example, the shaft 7a of the upper guide roller 7 has a cover body as shown in FIG.
A side wheel 13a is rotatably supported by a side plate 13a of 13 and a belt wheel 17 is attached to the outer shaft 7a of the side plate 13a, and a drive shaft 1a of the mold roll 1 is attached via a flat belt 18 and a belt wheel 19. Is linked to. The diameters of the belt wheels 17 and 19 are set so that the peripheral speed of the mold roll 1 and the moving speed of the metal belt 11 are the same so that slippage does not occur between the surface of the mold roll 1 and the surface of the metal belt 11. Is set as follows.

Although the upper guide roller 7 is used to drive the metal belt 11, the lower guide roller 8 or the tension roller 9 may be used, or two or all of the rollers 7, 8, 9 may be used. . Further, although the upper guide roller 7 is the winding transmission mechanism using the flat belt 18, it may be a gear transmission mechanism or may be connected to a rotation driving device other than the mold roll 1.

In the above structure, the mold roll 1 is cooled from the inside, and is rotated in the direction of arrow A so that the cast piece 5 is pulled out downward. Then, the mold roll 1 is rotated by the upper guide rollers 7 via the belt wheels 17 and 19 and the flat belt 18.
Then, the metal belt 11 is driven at the same speed as the peripheral speed of the mold roll 1 and in the same direction at the contact portion with the mold roll 1. Then, the mist-like cooling water is sprayed from the air mist nozzle 12 onto the back surface of the metal belt 11 in the contact portion with the mold roll 1, and the front surface of the mold roll 1 is cooled via the metal belt 11. The cooling water and steam after cooling are collected from inside the cover body 13 by the pump 20 and the recovery pipe 16
After being cooled, the air is cooled and supplied again to the air mist nozzle 12.

According to the above-described embodiment, the metal belt 11 which is tensioned by the tension roller 9 is closely attached to the mold roll 1 between the upper and lower guide rollers 7 and 8, and the surface of the mold roll 1 is entangled through the metal belt 11. Since it is cooled by the cooling water from the nozzle 12, the heat transferred to the surface layer of the mold roll 1 due to the contact with the molten steel 3 is immediately and immediately afterwards the metal belt 11 from the surface on the opposite side of the molten steel contact portion. The surface temperature of the mold roll 11 can be sufficiently lowered to maintain the properties of the slab 5 and the withdrawal temperature appropriately, and the molten steel 3 can be formed on the surface of the mold roll 1 with water remaining. It can be cooled safely without contact. Further, the water droplets and water vapor after cooling are recovered from the inside of the cover body 13 by the recovery pipe, so that the cooling water can be used without waste, and the water vapor does not contact the molten steel 3 or the like and adversely affect the casting. Further, the metal belt 11 is moved at the same speed as the peripheral speed of the mold roll 1 as the upper guide roller 7 is interlocked with the mold roll 1 via the belt wheels 17 and 19 and the flat belt 18, so that the structure is extremely simple. Thus, the metal belt 11 can be moved without causing slippage between the surface of the mold roll 1 and the surface of the metal belt 11.

As described above, according to the present invention, the surface of the mold roll is cooled by the cooling water from the spray nozzle through the metal belt that is in close contact with the surface of the mold roll between the pair of guide rollers. Immediately after that, the heat transferred from the surface of the mold roll to the surface of the mold roll can be quickly and effectively taken away from the surface through the metal belt, and the surface temperature of the mold roll can be sufficiently lowered to reduce the slab. The property and the drawing temperature can be kept appropriate, and the mold roll can be cooled safely and effectively without contacting the molten steel with water remaining on the surface.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a vertical sectional view showing a surface cooling device, and FIG. 2 is a perspective view with a cover body omitted.
FIG. 3 is a plan sectional view of the surface cooling device. 1 ... Mold roll, 7 ... Upper guide roller, 8 ...
Lower guide roller, 9 …… tension roller, 10 …… tension cylinder, 11 …… metal belt, 12 …… air mist nozzle, 13 …… cover body, 16 …… recovery pipe.

Claims (1)

[Scope of utility model registration request] 1. A mold roll cooling device in a continuous casting facility for supplying molten steel between a pair of left and right mold rolls arranged in parallel with each other to continuously draw out a slab from between the mold rolls. A pair of guide rollers, which are rotatable around an axis parallel to the mold roll, are arranged at positions that are close to the outer periphery on the opposite side and are spaced at appropriate intervals, and are located outside the pair of guide rollers. Then, a tension roller that is biased outward is provided, and between the pair of guide rollers and the tension roller, an endless metal belt whose surface is closely adhered between the guide rollers is movably wound around the mold roll. Cooling of mold rolls in a continuous casting facility, characterized in that a spray nozzle for spraying cooling water is provided on the back surface of the metal belt between a pair of guide rollers. Apparatus.