JPS5913420B2 - Band support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for a band-shaped object such as a steel strip, and in particular to a support device that can perform non-contact support in an optimal state corresponding to the width of the band-shaped object. It is.

For example, threading a strip between two fixed support points over a relatively long distance, such as supporting a steel strip after gas wiping in a continuous hot-dip galvanizing line, or supporting a steel plate during drying of a painted steel plate. In some cases, it may be necessary to hold the strip in a non-contact manner.

As a means of supporting the strip between such fixed support points in a non-contact state to prevent vibration of the strip and C warping in the width direction, fluid dynamic pressure or hydrostatic pressure is applied to the surface of the strip to create a fluid cushion. Techniques are known for supporting a band-like body by utilizing the effect. That is, as an apparatus for non-contact support of a strip drawn out vertically from a plating bath in a strip melt plating line using the gas wiping method, JP-A-52-56025 can be mentioned. .

Furthermore, a technique disclosed in Japanese Patent Publication No. 48-3381 is known as a device for horizontally conveying a strip without contact. However, the strip supporting device disclosed in JP-A-52-56025 has a fluid pad that is movably arranged in multiple parts in the width direction of the strip, so that it can be adjusted according to the shape of the traveling strip (particularly C-curvature). The purpose is to correct warpage by moving and adjusting the necessary pads as appropriate.

However, in reality, the strip is threaded at high speed and the displacement of the strip shape is not uniform, so controlling the movement of a multi-segmented fluid pad under high-speed threading is extremely difficult in terms of speed response. Not only is it difficult to do so, but it is also practically impossible to set a distance for retracting the fluid pad depending on the shape of the strip. Furthermore, in the conveyance device disclosed in Japanese Patent Publication No. 48-3381, the fluid support device is wider than the width of the plate both above and below, and the amount of fluid supplied is excessive.

For this reason, in the case of a narrow strip, turbulence is likely to occur due to the collision of jet flows beyond the width of the strip, and especially when controlling the differential pressure between the upper and lower jet pressures, large turbulence will occur on one side. There is a problem that stable sheet threading is obstructed. In the case of steel strips, steel strips usually come in various widths depending on the needs of customers.

In plate threading equipment for plating, painting, and annealing;
The equipment scale is determined according to the maximum width of the strip, and the fluid flow rate and pressure of the fluid pressure pad are similarly set. In order to efficiently utilize these supporting forces, it is possible to maintain the fluid pressure pad within the width of the strip in both static pressure and dynamic pressure even if the width of the strip changes, and to apply it to the strip. close proximity is required for maximum support.

However, the reality is that conventional support devices do not have a structure that can adequately cope with this variation in board width. The present invention solves the problems found in the conventional non-contact means for band-shaped bodies as described above, and can cope with variations in the width of the band-shaped body with a single fluid pressure pad, and can be applied to the belt-shaped body running in any posture. It is an object of the present invention to provide a support device for a band-shaped body that can apply fluid pressure in an optimal state, thereby effectively preventing vibration and C-warping of the band-shaped body.

The contents of the present invention will be explained in detail below based on the drawings.

FIG. 1 shows an example in which the present invention is applied to vibration prevention and correction of crosswise warpage (C-curvature) of a steel strip drawn out from a plating bath in a continuous hot-dip plating line.

In the figure, 1 a plating bath in the plating bath 2, 3 a sink roll 4 in the plating bath 1, and a strip that is pulled vertically upward between the top rolls 5 provided at a long distance above the plating bath 1. , 6 are a pair of wiping nozzles which are arranged opposite to each other immediately after the strip 3 is drawn out from the plating bath 1. The strip 3 is immersed in the plating bath 1 and pulled out with a large amount of plating metal attached to its surface.
The desired plating pressure is controlled by jetting gas). In this case, since the speed of transition of the strip 3 is quite high, vibration occurs in the strip between the two fixed supporting points (sink roll 4 and top roll 5), and C warping in the width direction occurs due to the tension acting between the two points. Since this vibration and warping cause damage to the plating layer or uneven plating due to contact of the wiping nozzle 6 with the strip, it is necessary to reduce it as much as possible. For this reason, as shown in the figure, a dynamic pressure pad 7 and a static pressure pad 8 are arranged facing each other along the strip line above the wiping nozzle 6, sandwiching the strip 3, for example, so that the fluid pressure is applied to the surface of the strip 3. The strip 3 is held in a non-contact state to suppress its vibration and warping in the width direction.

However, the effect will be further enhanced if the fluid pressure pads are arranged in multiple stages along the strip. The present invention is characterized in that among the fluid pressure holding means consisting of a combination of the dynamic pressure pad 7 and the static pressure pad 8, the static pressure pad 8 is installed so as to be rotatable in a plane parallel to the strip surface. .

The rotatable static pressure pad 8 is formed into an elliptical box shape as shown in FIG. 2, or a rectangular or rhombic box shape as shown in FIG. 3. However, the static pressure pad 8
The length of the long axis (long side in the case of a rectangle) is slightly shorter than the maximum width of the strip 3 to be threaded, and the short axis (short side)
The length of the strip should be slightly smaller than the minimum width of the strip. Figure 2 A shows the position of the static pressure pad 8 when the strip 3 with the maximum board width passes through, and its long axis is parallel to the width direction. 3
It shows the position of the static pressure pad 8 when the strip passes through, the long axis of which is parallel to the direction of strip transition.

When the strip 3 has an intermediate width, the static pressure pad may be tilted at an appropriate angle as shown by the two-dot chain line in FIG. 2A, for example. Therefore, in the present invention, one static pressure pad 8 can be applied to strips 3 of all widths, and fluid pressure can be applied most effectively to strips of any width at all times, thereby achieving the objective. This makes it possible to minimize the vibration and C warping of the strip. However, the length of the dynamic pressure pad 7 on the opposite side is made to be within or longer than the maximum width of the strip, and its position does not need to be changed even if the width changes. Of course, dynamic pressure pad 7
Similarly to the static pressure pad 8, the pad may be rotated in a plane parallel to the surface of the strip 3. In this case, there is an effect of increasing the effective width when dynamic pressure acts on the strip surface. In the illustrated example, the holding means is a combination of the dynamic pressure pad 7 and the static pressure pad 8, but the present invention is not limited to this, and the present invention is not limited to this. It is also possible to appropriately combine one or two types of pressure pads, or to arrange them in a staggered manner instead of facing each other.

Fig. 3 shows other examples of static pressure pad shapes, where A shows a rectangular static pressure pad 8a, and the opening shows a diamond-shaped static pressure pad 8a.
b, and there is no difference in function from the one shown in Fig. 2. Note that the static pressure pad 8c indicated by the chain line in the opening of Figure 3 indicates the opposite side of the strip 3 that faces the pad 8b, and if one of the static pressure pads 8b is tilted, it will intersect with this. Like the other static pressure pad 8c
are tilted at the same angle. By slanting the opposing static pressure pads so as to intersect with each other in this manner, the holding force of the strip 3 is made uniform. FIG. 4 is a bottom view in the case of non-contact support of the strip 3 being conveyed in the horizontal direction. The strip 3 is held by static pressure from below.
If the width of the strip 3 changes, the angle of the static pressure pad 8 may be changed in accordance with the width as shown by the two-dot chain line. Next, an example of the rotation mechanism of the fluid pressure pad is shown in FIG.

In the figure, 3 is a strip, 8 is a static pressure pad, 9 is a pad support pipe fixed so as to communicate with the approximate center of the static pressure pad 8, and 10 is a support pipe 9 that is held via a bearing 11 or the like. a support frame; 12 is a motor held and fixed to the support frame 10; 13 is a rotating gear fixed to the shaft of the motor 12; 14 is a gear meshing with the rotating gear 13 and fixed to the pad support pipe 9; 15 is a gear; This is an inclination angle indicating plate provided at the gear 14 position. The pad support pipe 9 is connected at its rear end to a fluid supply pipe via a flexible tube 16. In order to rotate the static pressure pad 8, the support pipe 9 may be rotated by driving the motor 12, but the angle of rotation is determined in advance by the width of the strip 3 to be threaded, and the angle of inclination is determined in advance. All you have to do is use the indicator board 15 to adjust to the set angle. Note that the rotation axis of the static pressure pad 8 does not necessarily need to be provided at the center of the pad. The fluid used in the present invention can be a gas such as an inert gas or air, or a liquid, and it is preferable that the ejection flow rate and pressure can be adjusted as appropriate. As explained above, according to the support device of the present invention, the fluid pressure pad can rotate in a plane parallel to the strip, and can arbitrarily follow variations in the width of the traveling strip. . Therefore, the fluid pressure pad can always efficiently apply maximum fluid pressure to the strip, thereby preventing vibrations and achieving stable conveyance of the strip. In some cases, it is also possible to partially concentrate fluid pressure on the strip, which is effective for correcting shape defects such as C-curvature. Furthermore, compared to conventional multi-segmented pads, the structure is extremely simple, and it is easy to manufacture, arrange, and operate, making it much more practical.)

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing a continuous melt welding process for steel strips, and Fig. 2 A is a front explanatory view showing an example of the present invention.
A shows the case of a wide band-like body, and the mouth shows the case of a narrow band-like body. Figure 3 A, mark 1 A front explanatory view showing another structural example of the present invention,
FIG. 4 is a bottom view when the present invention is applied to a belt-like object in a horizontally conveyed state, and FIG. 5 is a schematic cross-sectional view showing a specific example of the rotation mechanism of the fluid pressure pad according to the present invention. 3... Strip, 6... Wiping nozzle, 7... Dynamic pressure pad,
8...Static pressure pad, 9...Butt support pipe, 10
...Support frame, 12...Motor, 13.14 Gear.

Claims (1)

[Claims] 1. In a support device for a band-shaped body in which a hydrostatic fluid pressure pad is arranged in a non-contact state with respect to the surface of the running band-shaped body, the hydrostatic fluid pressure pad is installed so as to be rotatable in a plane parallel to the surface of the band-shaped body. A support device for a belt-like body, characterized by: