JPS62202031A - Floating supporting device for changing direction of traveling steel strip - Google Patents

Abstract

PURPOSE:To pass a steel strip at a low flow rate of gas for floating with good stability by trisecting a floating supporting device to front and rear supporting devices and linear supporting device disposed therebetween before the direction of the traveling steel strip is changed in direction respectively 90 deg.. CONSTITUTION:The steel strip 1 travels from below and changes the direction downward by 180 deg.. The steel strip 1 traveling from below is run horizontally by the 1/4 arc-shaped floating supporting device 2 assigned to make 90 deg. turn. The steel strip 1 traveling horizontally is then supported from below by the linear floating supporting device 3. The steel strip 1 is successively turned 90 deg. downward by the arc-shaped supporting device 2' similar to the rear device 2. The devices 2, 3, 2' have nozzles 4 facing inward to each other so as to intersect orthogonally with the traveling direction of the steel strip 1 and receive the pressure generated by the flow ejected from the nozzles 4 on pressure receiving surfaces 5.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a floating support device for changing the direction of a running steel plate in a continuous steel plate annealing furnace, a steel plate continuous plating furnace, a steel plate continuous coating furnace, etc. It can also be applied to paper manufacturing/printing machines, paper coater drying lines, etc.

[Conventional technology]

A conventional fluid support device is shown in FIGS. 6 and 7.

This is based on the document ``Journalor%eron &
8teel engineering network, May, 1963
P401J, in which a running steel strip 01 is passed through a fluid floating support device 011 in a non-contact manner. This fluid flotation support device 011 has two slit nozzles 04 each facing inward on the lower cylindrical surface of the steel strip 01 for half a circumference in order to change the direction of the entire running steel strip by 180 degrees. It is provided. This device has one pressure chamber 012, and each slit nozzle 04 has the same size in the local direction. The tension applied to the steel strip o1 is supported by the pressure from the fluid using the hovercraft principle.

[Problems that the invention helps solve]

(1) In the case of the fluid levitation support device shown in FIGS. 6 and 7, if the distance between the fluid levitation support device 011 and the steel strip o1 is the same over the entire outer circumference, as shown by the broken line in FIG. 8, Fluid pressure is generated uniformly around the outer circumference of the fluid floating support device 011.

However, the steel strip 01 is suspended by the fluid levitation support device 0 due to tension.
As shown by the solid line in FIG.
Therefore, when the entire copper strip o1 is supported by the fluid levitation support device 011, the levitation height will be the minimum at the top (90°) and the minimum at the side (0°). ,
The distribution becomes maximum at 180°).

Therefore, there is a possibility that the steel strip 01 comes into contact with the top of the device 011, and in order to prevent this, it is necessary to increase the fluid pressure on the pressure receiving surface. Inevitably, the flow rate of gas required for levitation must be increased, and the seaning cost increases.

Furthermore, if the floating height of the support device 011 is uneven, such that the floating height is high at the side surface and low at the top, problems such as the steel strip 01 being in an unstable floating state occur.

(2) Next, in Japanese Patent Publication No. 44-11451, is there a hovercraft type nozzle like this? It is shown that it is used in place of a 180' turn roll, and although the pressure pad itself is divided into four parts, the inside of the pressure pad is electrically connected to all nozzles. Therefore, since it is not possible to control the pressure or flow for each nozzle, attempting to float the top would require too much overall pressure or gas flow, and the side height would be unnecessarily high. This causes problems such as unstable sheet threading.

(3) JP-A No. 52-39509 also uses the method of applying tension and presses it! Although it is mentioned that the pressure pads 1 are arranged in parallel, the pressure of each pressure pad 1 is controlled by a common pressure, or a very large number of pressure pads of completely different systems are arranged in parallel. I can't imagine there being any tricks to the pressure pad. Therefore, this also has the same problems as those discussed in Japanese Patent Publication No. 44-11451.

[Means to solve all problems]

As mentioned above, the problem with the practical use of floating support devices is that the top (9
0°) and stable plate threading. Therefore, in the present invention, the floating support device is divided into three parts in the running direction, the front floating support device is turned 90° to make the steel plate horizontal, and the horizontal portion is used as a conventional floating support device (for example,
-49419 type), and by turning the copper strip through 90 degrees using a floating support device at the rear, the running direction of the copper strip can be completely changed.

[Effect]

As shown in Figure 8, the force exerted on the top of the levitation support device due to the tension of the copper strip is absorbed by the intermediate horizontal levitation support device, so even if the tension is high, the plate of the intermediate horizontal levitation support device This can be addressed by increasing the length in the running direction.

〔Example〕

(1) A first embodiment is shown in FIGS. 1 and 2.

In the figure, 1 is a steel strip, and the steel strip 1 runs from below and changes direction 1800 degrees downward. 2 is an arc-shaped floating support device that takes the 90' turn of the steel strip 1 running from below, and 3 is a linear floating support device that supports the horizontally running steel strip 1 from below (in the direction of supporting tension). be.

At the rear of the linear floating support device R3, an arcuate support device 2' similar to the arcuate floating support device 2 is attached.
A horizontally running steel strip 1 is turned downward by 90°.

A 180° turn of the steel strip 1 is performed by the above three types of floating support devices 2, 3, and 2'.

Reference numeral 4 designates nozzles υ which are orthogonal to the running direction of the steel strip 1 and face inward from each other. Reference numeral 5 designates a pressure receiving surface that receives pressure generated by the flow ejected from the nozzle 4. 6 is a flotation support device 2;
This is the gas supply port for 3 and 2'.

Here, depending on the tension T applied to the steel strip 1, it is most effective if the force that supports the steel strip 1 upward is in the same direction as the pressure acting on the steel strip 1. Therefore, in the case of this embodiment, in the intermediate linear floating support device 3, the direction of the pressure acting on the steel strip 1 and the direction of the force that should support the steel strip 1 are the same, so this linear floating support device 3 Most effectively with steel strip 1
can support. As a result, the force to be borne by the arcuate floating support device 2 for the front and rear 90' turns can be reduced, and it is only necessary to flow only the flow rate to prevent contact.

From the above, it is possible to increase the application limit of tension in the floating support device without unnecessarily increasing the gas flow rate supplied to the floating support device.

(2) FIG. 3 shows a second embodiment.

In the second embodiment, the nozzles, which were provided only in the direction orthogonal to the running direction of the copper strip in the first embodiment, are further provided so as to face inward from each other in the running direction of the copper strip. Compared to the example, the pressure sealing effect on the pressure receiving surface is higher.

Therefore, in the second embodiment, since the pressure holding function is high, even if the copper band vibrates and its floating position approaches the pressure receiving surface, it becomes difficult for the copper band to come into contact with the pressure receiving surface.

(3) A third embodiment is shown in FIGS. 4 and 5.

In the third embodiment, a plurality of rows of ribs 7 are provided on the surface of the pressure receiving surface 5 along the width direction of the plate, and the flow resistance thereof reduces gas leakage in the width direction of the plate, thereby reducing the flow rate of the gas used. At the same time, the pressure holding function on the pressure receiving surface 5 is increased. Therefore, even if the steel strip 1 vibrates and its floating height approaches the pressure receiving surface 5, the steel strip 1 and the pressure receiving surface 5 are unlikely to come into contact with each other.

In addition, in the above-mentioned first and third embodiments, the case where the copper strip changes direction from upward running to downward running is illustrated, but it can also be applied to the case where the top and bottom are reversed and the direction is changed from left to right. .

〔Effect of the invention〕

(1) Since the steel strip can be supported in levitation at the minimum required levitation height, the flow rate of gas required for levitation is smaller than in the past, reducing running costs.

(2) By lowering the flying height on average, the stability of the copper strip increases and the quality of the steel strip is improved by eliminating contact scratches.

(3) The running speed of the copper strip can be increased.

(4) The upper limit of tension will be relaxed and the range of application will be expanded.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a first embodiment of the floating support device for changing the direction of a running steel strip according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG.
4 is a side sectional view of the third embodiment of the present invention, FIG. 5 is a plan view of FIG. 4, and FIG. 6 is a plan view of the second embodiment of the present invention.
The figure is a schematic diagram of a conventional device, FIG. 7 is a sectional view taken along the line A-A in FIG. 6, and FIG. 8 is a diagram illustrating the entire relationship between copper strip tension and floating part pressure in the conventional device. 1...Copper band, 2,2'...Circular floating support device, 3...Linear floating support device, 4...Nozzle, 5...Pressure surface sub-agent Patent attorney Shige Okamoto 2 people outside the text Figure 5 Figure 6

Claims (1)

[Claims] A floating support device that supports and changes direction of a running steel strip using gas pressure, comprising front and rear arcuate floating support devices that change the direction of the running steel strip by 90 degrees, and the front and rear support devices. 1. A floating support device for changing the direction of a running steel strip, comprising a linear floating support device disposed in the middle.