JPS6315333B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a method for disposing a strip along the threading line of a strip-shaped material, for example, a metal strip, in a non-contact manner with respect to the strip in order to support the strip-shaped material. The present invention relates to a variable angle nozzle device that forms a static pressure pad.

(Prior art) A gas spray nozzle device is disposed opposite the upper and lower surfaces of a continuously moving strip-shaped material, and static pressure pads are formed on the upper and lower sides of the strip-shaped material, respectively, by the gas ejected from the nozzle device. A floating field type heat treatment furnace in which the strip material is supported in a floating manner has the advantage that the strip material does not come into contact with solid objects in the furnace during heat treatment and is free from scratches. In this floating heat treatment furnace,
The nozzle device is arranged in section A, as shown in FIG.

In the conventional nozzle device, P-
As shown in FIG. 2, which is a P cross section, the gas ejected from the slit nozzles 1 (hereinafter simply referred to as slits) and 2 toward one side, for example, the top surface, of the strip material 7 causes a static gap 3 on the upper side of the strip material 7. A static pressure pad A with a pressure a is generated, and on the other hand, a static pressure pad B with a static pressure b is also generated in the interval 6 below the strip material by gas jetted from the slits 4 and 5 toward the lower surface of the strip material 7. and the difference between both static pressures (b) -
In (a), the strip material 7 is levitated and supported in a non-contact state.

Here, the slit shape in a general nozzle device will be explained with reference to FIG. 3. In FIG. Although the parallel slits are shown in the direction shown in FIG. Therefore, in order to increase the static pressure, the moving direction Y of the strip material 7 is
By adding two slits 1' and 2' that are parallel to and parallel to each other, slits 1, 1', 2,
The structure shown in Figure 3 (b), in which the static pressure pad is surrounded by a pad 2', is sometimes used; If it is small, as in the case of Figure 3 A, most of the blown air will proceed in the W and W directions, and the static pressure generation force will become small. , uneven baking occurs because the air from the slit hits the ear runny or a part of the band-shaped material intensively.

Further, a static pressure pad generator for supporting a strip is disclosed in JP-A-56-123330, in which a rectangular fluid discharge port is provided on the surface of the main body of the hollow pad generator disclosed, which faces the strip. In addition, a pressure receiving plate having a surface larger than the area of the discharge port is provided within the main body in the vicinity of the fluid port. Although this example is an effective technique for stabilizing the pass line, there are problems when it is used for floating conveyance of a strip-shaped material. That is, although it is possible to follow changes in the width of the strip-shaped material, the range of follow-up is narrow, and therefore it has the same problem as the nozzle device in the case of FIG. 3B.

(Object of the Invention) The present invention is a polygonal variable nozzle device used for floating conveyance of a strip material, and is used in a floating heat treatment furnace, for example, in a drying and baking section of a continuous coating line, to blow hot air onto a strip to transfer heat. The purpose of the present invention is to provide a nozzle device that is suitable for conveying a strip-shaped material, etc., particularly in a horizontal state, and has the ability to follow changes in the width of the strip while ensuring the width of the strip.

(Structure and operation of the invention) For example, even if there is a change in the width of the strip material that moves horizontally, the present invention follows this change and adjusts the width to an appropriate area, more precisely, the width in the direction perpendicular to the threading direction. It is possible to generate a static pressure pad with high efficiency and stable levitation, and the strip is reliably supported without contact.It also eliminates the uneven baking and static pressure pad width that conventionally occur due to heat transfer to the strip. This is a polygonal variable nozzle device that can prevent ear dripping when the width is smaller than the width of the strip.

The characteristic part of the polygonal variable nozzle device of the present invention is that it has a fixed nozzle part having parallel slits and gas passage spaces on both sides thereof, and side slits extending in a direction intersecting the parallel slits. ,
Covering the gas passage space and above the fixed nozzle,
A reciprocating movable nozzle section is provided above both gas passage spaces, making it possible to arbitrarily change the interval between the side slits.

One configuration example of the present invention will be explained with reference to FIGS. 4 and 5.

In the figure, R denotes a fixed nozzle part, and a guide plate 9 is installed in the center of the space of the frame-shaped nozzle frame 8 on long sides 18 and 18' perpendicular to the threading direction. Two fixed slits parallel to 1
3,13'. and fixed slit 13,1
3' indicates that the gas blown out from both fixed slits 13, 13' is aligned with the center line
(Figure 5 A) Ramp 17, 1 facing the direction
7'. The fixed nozzle part R has sides 19 parallel to both sides of the guide plate 9 and the direction of threading of the nozzle frame 8;
19', in other words, the fixed slit 1
Gas passage spaces 14 and 14' are formed between the extension lines on both sides of each of the slits 13 and 13'.
It is preferable that the space portion 14 and the space portion 14 communicate with each other.

Next, S is a moving nozzle section, which is divided into two parts, each of which is arranged symmetrically above the fixed nozzle.

Therefore, only the right side of FIG. 4A will be explained.

Reference numeral 11 denotes a polygonal plate having one end shaped like a roof. The polygonal plate 11 is pentagonal in this example, and is located on the guide plate 9, with a central side 23 parallel to the sheet threading direction and a parallel side 23 perpendicular to the sheet threading direction. sides 21, 21', and sides 21,
21', and roof-shaped sides 22, 22' extending in directions intersecting the respective sides 21'. As shown in FIG. 5-B, sloped surfaces 11' similar to those of the nozzle frame 8 are formed on the four sides excluding the side 23. 1
0 is the sides 21, 21', 22, 2 of the polygonal plate 11
2', the flat plate 10 and the polygonal plate 11 are connected with each other with a gap formed between opposite sides of the similar shapes. , the parallel slit 13 of the fixed nozzle part S,
A movable parallel slit 15,1 partially overlaps with 13' and extends toward the gas passage space side.
5' and movable lateral slits 16, 16' originating from the ends of the movable parallel slits and extending in a direction transverse to the movable parallel slits.

Then, the polygonal plate 11 is slidably arranged on the guide plate 9, and the flat plate 10 is guided on the nozzle frame 8 by the guide frames 20, 20' so that it can be slid back and forth in a direction perpendicular to the plate passing direction.
A movable nozzle section S is connected to an advancing/retracting device 12.

By operating the advancing/retracting device 12, the movable nozzle portion S can be moved back and forth in accordance with the width of the band-like member, and the gap between the two movable side slits can be set to a desired dimension to form a static pressure mat having a desired width.
The shape of the movable side slits may be more polygonal, as long as the shape allows the gas to be blown uniformly in the width direction of the strip.

(Effects of the Invention) Since the nozzle device of the present invention is configured as described above, when the present invention is applied to a continuous coating line, it is possible to follow the change in the width of the strip member in the drying and baking section, and move both sides. By changing the interval between the side slits to a desired dimension, it is possible to form a static pressure mat with the optimum width for the width of the strip member. Therefore, uneven burning and dripping do not occur, and the strip member can be properly processed. It is possible.

[Brief explanation of the drawing]

Figure 1 is a conceptual diagram of a horizontal heat treatment furnace, Figure 2 is a
Figure 3 is an explanatory diagram of the nozzle device;
Figures A and B are a plan view and a partially sectional side view for explaining an embodiment of the nozzle device of the present invention, and Figures A and B are
Figures B, C, D, and E are exploded explanatory views of embodiments of the nozzle device of the present invention. R...Fixed nozzle part, 8...Nozzle frame, 9...
...Guide plate, 10... Polygonal plate, 11... Flat plate, 1
2... Advancement/retraction device, 13, 13'... Fixed slit,
14, 14'... Gas passage space, 15, 15'...
...Movable parallel slit, 16, 16'...Movable side slit, Y...Panel passing direction, S...Movable nozzle section.

Claims (1)

[Scope of Claims] 1. A nozzle device that is disposed in a non-contact state with respect to a strip-shaped material to be threaded to form a static pressure patch, comprising: two fixed slit nozzles that are orthogonal to the threading direction and parallel to each other; , a fixed nozzle part having a gas passage space between the extension lines on both sides of each of the two fixed slit nozzles, and a movable part that partially overlaps with the two fixed slit nozzles and extends toward the gas passage space. two sets of movable nozzle parts having a possible parallel slit nozzle and a movable lateral slit nozzle located above the gas passage chamber and extending from the two movable slit nozzles in a direction intersecting the two movable slit nozzles respectively; The two sets of movable nozzle parts are movable reciprocally in a direction orthogonal to the sheet passing direction so that the movable side slit nozzles are on the outside so as to cover both the gas passage spaces, respectively, above the fixed nozzle part. A polygonal variable nozzle device characterized by: