JP4181686B2 - Cooling device with sink roll - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling device provided with a sink roll for preventing meandering of a metal strip traveling in a liquid when the metal strip is water-cooled in a heat treatment line of the traveling metal strip.
[0002]
[Prior art]
In a continuous annealing line in which a steel strip is run and continuously annealed, water cooling is used for cooling from about 250 ° C. or less. In the water cooling, the steel strip strip exiting the annealing furnace is introduced into the water tank, and the direction is changed by the sink roll and pulled up from the water tank.
[0003]
In the water tank, water is caught between the rotating sink roll surface and the traveling steel strip, and the steel strip moves away from the roll surface due to the caught water. A suction cooling roll that sucks into the roll is used.
[0004]
The suction cooling roll is disclosed in, for example, Japanese Patent Application Laid-Open No. 7-179932, which uses atmospheric gas as a cooling medium. FIG. 4 is a cross-sectional view showing an example of a conventional sink roll. A fixed inner cylinder 19 and a rotatable outer cylinder 20 are provided on the same axis, and a plurality of suction holes 21 are provided on the outer cylinder surface, and an opening 22 is formed on the surface of the inner cylinder 19 corresponding to the strip contact surface side. The atmospheric gas is sucked into the inner cylinder 19 through the opening 22 from the suction hole 21 provided in the outer cylinder 20.
[0005]
[Problems to be solved by the invention]
In a conventional sink roll having a water suction hole, the centrifugal force (proportional to the square of the number of revolutions) generated in the fluid sucked into the sink roll increases as the line speed increases to 700 m / min or more. Then, water flows out from the inside of the sink roll through the suction hole between the steel strip and the roll surface, which hinders the adhesion between the steel strip and the roll surface and causes meandering.
[0006]
Therefore, the present invention provides a cooling device including a sink roll that can prevent meandering of a steel strip accompanying an increase in line speed.
[0007]
[Means for Solving the Problems]
A cooling device having a sink roll according to the present invention includes a sink roll which is cylindrical in a tank and closed on both sides by side plates, and is rotatably supported by a shaft fixed to the both side plates and a hollow rotary shaft. A plurality of suction holes communicating with the inside of the sink roll are provided on the surface of the sink roll, the hollow rotary shaft is connected to the suction pump, and an outer baffle plate is provided facing the surface where the steel strip of the sink roll does not contact. It is characterized by being.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an overall view of the cooling device of the present invention. A sink roll 3 having a cylindrical shape and closed on both sides by side plates 2 is arranged in the tank 1, and a plurality of suction holes 4 communicating with the inside of the sink roll are provided on the surface of the sink roll 3.
[0009]
The sink roll 3 is provided with a shaft 5 and a hollow rotary shaft 6 at the center of both side plates 2 and 2, and the shaft 5 and the hollow rotary shaft 6 are connected to bearings 7 and 7 outside the tank 1 via mechanical seals 8 and 8. It is supported. The shaft 5 is connected to a motor (not shown) for rotating the sink roll 3.
[0010]
A suction port 9 at the tip of the hollow rotary shaft 5 extends in the sink roll 3. The other end of the hollow rotary shaft 5 is connected to a suction pump 11 via a rotary joint 10. A discharge port 13 of the pipe 12 on the discharge side of the suction pump extends to the upper surface of the tank 1, and a flow rate adjusting valve 14 and an orifice 15 are provided in the middle of the pipe 12. The suction force is adjusted by the flow rate adjusting valve 14.
[0011]
2 and 3 are views showing the arrangement of the external baffle plates. As shown in FIG. 2 or FIG. 3, the external baffle plate 16 is supported by the tank by the support member 17 so as to face the surface of the sink roll 3 where the steel strip S does not contact. A rib 18 is provided around the outer baffle plate 16 toward the surface of the sink roll 3. The distance between the external baffle plate 16 and the sink roll 3 is made as small as possible within the range where the external baffle plate 16 does not interfere with the surface of the rotating sink roll 3, and the amount of water sucked is minimized.
[0012]
With the above configuration, the external fluid can be sucked through the suction hole 4 of the sink roll 3 in contact with the steel strip S using the suction pump 11 and the steel strip S can be brought into close contact with the surface of the sink roll 3. It becomes. Since the flow path is blocked by the external baffle plate 16 from the suction hole 4 in the portion of the sink roll 3 that is not in contact with the steel strip S, it is hardly sucked. The steel strip S can be effectively adhered to the roll surface.
[0013]
【The invention's effect】
In the present invention, the flow from the outside to the inside of the roll can be effectively obtained with a simple sink roll structure and a suction pump, and the flow path is blocked by the external baffle plate, so that excess water can be sucked. Therefore, it is possible to prevent the water in the sink roll from coming out of the suction hole to the roll surface due to centrifugal force, so that the steel strip can be brought into close contact with the roll surface.
[Brief description of the drawings]
FIG. 1 is an overall view of a cooling device of the present invention.
FIG. 2 is a diagram showing the arrangement of external baffle plates.
FIG. 3 is a diagram showing another arrangement of external baffle plates.
FIG. 4 is an explanatory diagram of a conventional sink roll.
[Explanation of symbols]
1: Tank 2: Side plate 3: Sink roll 4: Suction hole 5: Shaft 6: Hollow rotating shaft 7: Bearing 8: Mechanical seal 9: Suction port 10: Rotary joint 11: Suction pump 12: Piping 13: Discharge port 14: Flow control valve 15: Orifice 16: External baffle plate 17: Support member 18: Rib 19: Inner cylinder 20: Outer cylinder 21: Suction hole 22: Opening

Claims (1)

A sink roll that is cylindrical in the tank and closed on both sides by side plates is rotatably supported by a shaft fixed to the side plates and a hollow rotary shaft, and a plurality of surfaces that are in communication with the inside of the sink roll are provided on the surface of the sink roll. Cooling with a sink roll, characterized in that a suction hole is provided, the hollow rotary shaft is connected to a suction pump, and an outer baffle plate is provided facing the surface of the sink roll where the steel strip does not contact apparatus.

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