JPH081228A - Method and device for preventing meandering of strips in continuous processing line for strips - Google Patents

Abstract

PURPOSE:To improve quality and productivity by providing an opening part on the lower side part of an inner cylinder, connecting the inside of the inner cylinder to a vacuum pump, and sucking a belt-like object on the surface of the lower side part of a submerged roll. CONSTITUTION:On a submerged foil 2, a porous part 21 with lots of small holes within a range narrower than the minimum width of a steel strip S to be treated in this line, is formed in the center part of a roll main body 20. On its inside, an inner cylinder 23 coming into contact with the inside diameter of the roll main body 20 and which is a little shorter than the porous part 21, is provided. An opening part 23a is provided on the lower side part of the inner cylinder 23, and the inside of the inner cylinder 23 is connected to a vacuum pump 28 through a sucking tube 25. A belt-like object (steel strip) S is sucked on the surface of the lower side part of the submerged roll main body 20. Consequently, since a part except a part where the steel strip S is wound on the surface of the roll, is not sucked, the liquid in a liquid bath 5 is not sucked, the steel strip S is securely restricted, meandering or a slip caused by, the submerged roll does not occur, and stable threading can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for preventing the meandering of strips at a place where the strips pass through a liquid tank in a continuous processing line for strips such as steel strips.

[0002]

2. Description of the Related Art In a continuous processing line for strips such as steel strips (typically described as an example of steel strips), submerged rolls (sink rolls, submerged rolls) are placed at locations where the strips pass in a liquid tank. Ngroll) is used. One example thereof will be described with reference to FIGS. FIG. 3 is a front view showing a part of a continuous processing line for steel strips. S is a steel strip, 1a and 1b are liquid rolls, 2 is a submerged roll, and 5 is a liquid tank. The arrow indicates the traveling direction of the steel strip S. That is, in this example, the steel strip S has its traveling direction changed by 180 ° by the upper liquid roll 1a and becomes downward and enters the liquid tank 5 to undergo cleaning, plating, chemical treatment and other treatments, It is wound around the submerged roll 2 inside and the traveling direction is changed again by 180 °, and it is turned upward, exits the liquid tank 5, is wound around the submerged roll 1b, and further heads to the downstream side of the line.

FIG. 4 is a partial cross-sectional side view of the same portion as FIG. 3, showing a drive mechanism for the submerged roll 2.
A roll shaft 22 is rotatably supported by a bearing 24a provided outside the liquid tank 5, and is rotationally driven by a motor 31 via a conduction shaft 30 connected to one end of the roll shaft 22. A mechanical seal 29 is provided at a portion where the roll shaft 22 penetrates the liquid tank 5 to prevent liquid leakage.

In recent years, as the line speed has increased, slippage occurs between the steel strip S and the submerged roll 2 due to a winding failure caused by the inclusion of liquid or air bubbles between the steel strip S and the surface of the roll body 20. And the steel strip S is meandered. Generally, in rolls on liquid,
As a measure to prevent meandering, it is known to apply a crown to the cylindrical surface of the roll or use a steering roll having a function of correcting the roll angle, but for the submerged roll, there is a new factor of winding failure. Therefore, these cannot be dealt with.

According to Japanese Patent Laid-Open No. 3-198908, there is proposed a guide roll having a meandering prevention function in a cold strip manufacturing line. This will be described with reference to FIGS. 5 is a front view and FIG. 6 is a sectional view. 4 is a guide roll, 40 is a roll body, 41 is a porous pad, 42 is a roll shaft, 43 is a suction chamber, and 44 is a suction tube. In the meandering prevention roll 4, a porous pad 41, which is formed by intermittently molding ceramics in the circumferential direction, is integrally cast with a metal portion in a central portion of a roll body 40. The pores of the porous pad 41 communicate with the suction chamber 43 inside the roll and are connected to a vacuum pump (not shown) via a suction pipe 44 to suck the cold strip onto the roll surface and cause slipping or meandering. It is possible to reliably guide the cold strip with excellent restraint force.

[0006]

The guide roll described in Japanese Patent Laid-Open No. 3-198908 seems to be effective also as a submerged roll because it sucks from the roll surface.
As shown in FIG. 2, the steel strip S is not wound around the entire circumference of the rolls 1 and 2, and normally only about half of the entire circumference of the roll is in contact with the steel strip S. Since air or liquid is sucked without back pressure, a sufficient suction force cannot be obtained, and there is a problem that the meandering prevention action is not sufficient.

An object of the present invention is to improve this point and to realize a guide roll having an always effective restraining force.

[0008]

A method for preventing meandering of a strip in a continuous processing line according to the present invention is a method for winding a strip in a liquid tank around an outer periphery and transporting the strip in a central portion of a cylindrical roll body of a submerged roll. A porous portion having a large number of small holes is formed, an inner cylinder which is in contact with the inner diameter of the roll body and has a length corresponding to the porous portion is provided on the inner surface, and an opening is formed in the lower portion of the inner cylinder. In addition to being provided, the inside of the inner cylinder is connected to a vacuum pump via a suction pipe to suck the band-like material on the lower part surface of the submerged roll.

Further, the belt meandering preventive device in the continuous processing line of the present invention has a large number of small holes in the central part of the cylindrical roll body of the submerged roll for transporting the belt-shaped strip in the liquid tank. Forming a porous portion having an inner cylinder which is in contact with the inner diameter of the roll body and has a length corresponding to the porous portion and which does not rotate, and which is provided with an opening at a lower portion of the inner cylinder. The inside of the cylinder is connected to a vacuum pump via a suction pipe.

[0010]

[Operation] In the present invention, a porous part is formed in the central part of the roll main body, and an opening is provided only in the lower part of the inner cylinder connected to the porous part for suction, and the steel strip is formed on the roll surface. Since the suction is not performed from other than the wound portion, the liquid in the liquid tank is not sucked, the steel strip is securely restrained, and the guide can be performed without causing meandering or slipping.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 is a partial cross-sectional side view similar to FIG. 4 above, and FIG. 2 is a cross-sectional view taken along the line AA, and the same reference numerals are used for those common to FIG. Reference numeral 21 is a porous portion provided in the central portion of the roll body 20, 23 is an inner cylinder, 24 is a bearing, 25 is a suction pipe, 26 is a bracket, 27 is piping, and 28 is a vacuum pump.

In the submerged roll 2 of the present invention, a porous portion 21 having a large number of small holes is formed in the central portion of the roll body 20 within a range narrower than the minimum width of the steel strip S to be processed by this line,
Inside, the inner diameter of the roll body 20 is in contact, the porous portion
An inner cylinder 23 slightly shorter than 21 is provided. In FIG. 1, the portion of the roll main body 20 on the right side of the inner cylinder 23 passes through the roll shaft 22, the bearing 24a, the transmission shaft 30, and the motor.
It is the same as that of the conventional one shown in FIG.

The roll main body 20 is extended to the outside of the liquid tank 5 with the same diameter on both the left and right sides, and a mechanical seal 29 is provided at a portion penetrating the liquid tank 5. The inner cylinder 23 on the inside is
Both ends are supported inside the roll body 20 by bearings 24b and 24c, and the inner cylinder 23 itself does not rotate. As shown in FIG. 2, the inner cylinder 23 is provided with an opening 23a only in the lower portion.
A shaft-shaped suction pipe 25 is connected to the inner cylinder 23 and extends to the left outside of the bearing 24b, and its tip is supported by a bracket 26. The suction pipe 25 is further connected to a vacuum pump 28 via a pipe 27.

Since the roll body 20 is usually made of metal, rubber, ceramics or the like, a large number of holes are machined in the cylindrical portion to form the porous portion 21. It is desirable that the inner cylinder 23 on the inner side minimizes a radial gap with the inner surface of the roll body 20 so that suction can be effectively performed from the surface of the roll body 20. Roll length 1400mm, Steel strip width 8
In a steel strip continuous processing line of 50 mm and a plate thickness of 0.20 mm, meandering has conventionally occurred when the speed of the steel strip was 800 m / min or more, but with the present invention, static pressure of 100 Torr, air volume of 50 m ³ / mi
When suction was performed using a vacuum pump of n, the passing condition was stable, and it was possible to stably operate at 1000 m / min or more.

[0015]

According to the present invention, since there is no meandering or slippage due to submerged rolls and stable striping can be performed, the operating speed can be improved, and the quality and productivity are improved. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a front view showing a conventional technique.

FIG. 4 is a partial cross-sectional side view showing a conventional technique.

FIG. 5 is a front view showing another conventional technique.

FIG. 6 is a cross-sectional view showing another conventional technique.

[Explanation of symbols]

 1a, 1b Liquid upper roll 2, 4 Liquid sub roll 5 Liquid tank 20 Roll body 21 Porous part 22 Roll shaft 23 Inner cylinder 23a Opening 24a, 24b, 24c Bearing 25 Suction pipe 26 Bracket 27 Piping 28 Vacuum pump 29 Mechanical seal 30 Transmission shaft 31 Motor 40 Roll body 41 Porous pad 42 Roll shaft 43 Suction chamber 44 Suction tube

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Claims (2)

[Claims] 1. A continuous processing line for a band-shaped material, wherein a porous part having a large number of small holes is formed in a central part of a cylindrical roll body of a submerged roll for transporting the band-shaped material in a liquid tank wound around the outer periphery. , The inner surface of which is provided with an inner cylinder which is in contact with the inner diameter of the roll body and which has a length corresponding to the porous portion and which does not rotate, and which is provided with an opening at the lower portion of the inner cylinder and which passes through the suction tube inside the inner cylinder A method for preventing meandering of a strip in a continuous processing line, which is connected to a vacuum pump and sucks the strip on the surface of a lower part of the submerged roll. 2. In a continuous processing line for belt-shaped articles, a large number of a large number are provided in the central portion of a cylindrical roll body (20) of a submerged roll (2) for winding and transporting the belt-shaped article (S) in a liquid tank. A porous part (21) having small holes is formed, and an inner cylinder (23) which is in contact with the inner diameter of the roll body and has a length corresponding to the porous part is provided on the inner surface of the inner cylinder (23). An apparatus for preventing the meandering of strips in a continuous processing line, characterized in that an opening (23a) is provided in the inside of the inner cylinder and the inside of the inner cylinder is connected to a vacuum pump (28) via a suction pipe (25).