JP3139880B2 - Non-contact support device for thin plates - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact support device for stably holding a thin plate traveling horizontally in a non-contact state.

[0002]

2. Description of the Related Art In a heat treatment line such as a continuous annealing of a thin plate, for example, a thin steel plate, or a hot dip coating line, a steel plate may be conveyed in a horizontal state over a long section. In this horizontal conveyance section, it is desirable to stably hold the steel sheet in a non-contact state as much as possible without using a contact holding means such as a roll, in order to maintain the surface properties in a good condition.

[0003] Japanese Patent Application Laid-Open Nos. 61-210131, 62-63621, 62-96621, and 62-227044 disclose a method for holding a thin plate horizontally in such a non-contact state. A strip support floater technology disclosed in a gazette or the like has been proposed. This is shown in FIG.
A pair of fluid ejection slit nozzles 17 are formed on the pressure receiving surface of the pad body 16 and extend in the width direction of the strip, and a plurality of arc-shaped baffles extending in the running direction of the strip on the pad body surface between the slit nozzles. It has a structure in which the plates 18 are arranged. The purpose of this structure is to generate a static pressure between the band plate and the pressure receiving surface, and to prevent the fluid flow in the width direction of the band plate by the baffle plate to reduce the amount of leakage.

[0004]

However, in Japanese Patent Application Laid-Open No. 61-210131 and the following,
The effect of the baffle plate restricts the flow of the fluid in the width direction of the plate, and although the advantage that the stable floating of the band is achieved is recognized, the centering effect and flow rate of the band which are important in the non-contact support technology are recognized. The efficiency was not satisfactory.

That is, in the floater structure shown in FIG. 9, when the band plate meanders for some reason, the floater side returns the meandering band plate to the original normal line, that is, means for exhibiting a so-called centering function. Has not been taken. Further, the fluid jetting slit nozzle 17 is formed over the entire length of the pressure receiving surface of the pad body. Therefore, this is not a problem when the band plate is relatively wide, but when holding a narrow band plate. In this case, a large amount of fluid that does not fulfill the function of supporting the band plate flows out from the portion near the end of the slit nozzle, resulting in a decrease in flow rate efficiency.

The present invention solves such a problem of the conventional horizontal holding means, and has a centering function for immediately returning the thin sheet to a normal line when the running thin sheet deviates from a predetermined passing line and meanders. In addition, it is an object of the present invention to provide a thin plate non-contact support device which enables horizontal floating holding of a thin plate in a constantly stable state with very good flow rate efficiency.

[0007]

The gist of the present invention to achieve such an object is as follows. (1) In a non-contact support device in which a pad for ejecting fluid is arranged immediately below a thin plate traveling in a horizontal direction and the thin plate is held in a non-contact supporting state, a surface of the pad facing the thin plate is provided in a running direction. The length of the orthogonal slit section is the minimum of a thin plate
A rectangular fluid ejection slit nozzle having a width equal to or less than the width is formed, and a plurality of horizontal hurdle plates each of which is parallel to the running direction of the thin plate are almost equally disposed on both sides in the thin plate width direction of the pad body surface provided with the slit nozzle. A thin plate non-contact support device provided at intervals. (2) The non-contact support device according to (1), wherein the height of the plurality of horizontal hurdle plates is increased from the center of the pad toward both ends.

(3) In a non-contact support device for arranging a pad for ejecting a fluid just below a thin plate traveling in the horizontal direction and holding the thin plate in a non-contact support state, a surface of the pad facing the thin plate is A fluid jet slit nozzle for generating a static pressure is formed between the surface and the thin plate, and a plurality of sheets each of which is parallel to the running direction of the thin plate are provided on both sides in the thin plate width direction of the pad body surface provided with the slit nozzle. A thin plate non-contact support device, wherein hurdle plates having a curvature on an upper side are provided at substantially equal intervals, and the height of the hurdle plate is gradually increased from a center side to both end sides.

(4) In a non-contact support device in which a pad for ejecting fluid is disposed immediately below a thin plate traveling in a horizontal direction and the thin plate is held in a non-contact support state, a cross section of the pad in the thin plate width direction is centered. In the M-shaped surface of this pad, a fluid ejection slit nozzle is provided at a lower position in the center, and a plurality of upper surfaces parallel to the running direction of the thin plate are provided at inclined positions on both sides. A non-contact support device for a thin plate, wherein hurdle plates having a curvature are provided at substantially equal intervals.

(5) The angle θ between the line connecting the top of each hurdle plate on one side of the slit nozzle and the horizontal plane is 0 ° to
15 °, the distance d between adjacent hurdle plates
The support device according to any one of the above (1) to (4), wherein is in a range of 15 to 50 mm. (6) A closing plate for a fluid dam which is equal in height to the front and rear ends of the plurality of horizontal hurdle plates in the running direction is provided. 2. The non-contact support device according to claim 1.

[0011]

According to the present invention, a plurality of hurdle plates are arranged in the passing direction across the slit nozzle on the pad body surface, and the height of the hurdle plates is sequentially increased outward. From this, it is possible to control the effective flow of the fluid ejected from the slit nozzle and the flow direction of the fluid, and at the same time, when the thin plate meanders, a unique fluid flow is generated by these stepped hurdle plates And a centering action is achieved. In particular, by selecting the arrangement angle θ of the hurdle plate row and the installation interval d of each plate in the range described in claim 5, a flow of a fluid that exerts a lifting action of the end of the thin plate when the thin plate meanders is generated. , To perform more effective centering.

Further, by closing the front and rear ends of the hurdle plate with the closing plate according to the sixth aspect, the flow between the hurdle plates in the strip running direction is blocked, and the centering property is more effectively improved. , The flow rate can be reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In addition, although a thin steel plate is used as a traveling thin plate, it is needless to say that the present invention can be applied to horizontal transfer of another thin plate. FIG. 1 shows an example of the present invention, in which a hurdle plate 3B having a shape having a curvature on its upper side is employed. Actually, when a thin plate is transported in a horizontal state by a non-contact support device as in the present invention, the thin plate is bent at a certain curvature in the longitudinal direction at the position of the support device (pad). Therefore, the gap between the horizontal hurdle plate and the thin plate as shown in FIG. 2 becomes larger toward the center of the plate, so that the leakage of the fluid also increases and the flow rate efficiency decreases.
The hurdle plate 3B having the curvature shown in FIG. 1 attempts to minimize the gap between such steel plates. FIG. 5A is a view of one side of the hurdle plate 3B viewed from the center of the pad.

FIG. 2 shows an example of the present invention in which a rectangular horizontal hurdle plate is used as the hurdle plate. Although not shown in the box-shaped pad body 1, a fluid at a required pressure is supplied from, for example, the bottom side. It is possible. On the upper surface of the pad body 1 (the surface facing the thin plate), for example, a rectangular slit nozzle 2 and a plurality of hurdle plates 3 are arranged on both sides thereof.

In the rectangular slit nozzle 2, a slit portion parallel to the passing direction of the thin plate 4 to be supported in a non-contact manner is formed substantially the entire length of the upper surface of the pad body 1, but is orthogonal to the passing direction. The slits are formed in the center, leaving spaces on both sides. In addition, the slit width of the slit portion parallel to the plate passing direction is narrowed so that the flow rate is smaller than that of the other orthogonal side slit portion, and the slit angle is also substantially perpendicular. On the other hand, the orthogonal slit portions that increase the flow rate relatively have their slit angles inclined inward (eg, about 45 °). In addition,
It is necessary that the length of the slit portion orthogonal to the passing direction is smaller than the width of the minimum width steel plate among the thin plates to be passed.

In the present invention, the slit shape and the like are not limited to the rectangular shape shown in the drawing, and any shape or structure may be used as long as a static pressure is generated between the pad body and the thin plate. good. For example, the slit portion on the side orthogonal to the passing direction may be further extended to both sides,
Alternatively, only the slit portion on one side may be provided.

As shown in the figure, the same number (five in FIG. 5) of rectangular (horizontal) hurdle plates 3 are arranged at substantially equal intervals in spaces on both sides of a slit portion parallel to the passing direction. The height of the plate 3 is gradually increased from the center to the both ends. FIG. 5B is a view of one side of the hurdle plate 3 viewed from the center of the pad. The hurdle plate 3 is made of, for example, a metal plate or a plastic plate. At least two hurdle plates are required, and usually five or more hurdle plates are preferably installed. The hurdle plate may be integrally formed in some cases.

FIG. 10 shows an example in which closing plates 5 are used at both ends of the hurdle plate 3B of FIG. 1. By arranging the closing plates 5, the fluid flowing between the hurdle plates along the running direction of the strip is blocked. There is a utility to stop.

FIG. 11 shows an example in which closing plates 5 are used at both ends of a hurdle plate 3 having the structure shown in FIG.

FIG. 3 shows another example of the present invention.
Hurdle plate 3
The difference is that A having a shape having a curvature on its upper side is used as A. Actually, when a thin plate is transported in a horizontal state by a non-contact support device as in the present invention, the thin plate is bent at a certain curvature in the longitudinal direction at the position of the support device (pad). Therefore, the gap between the horizontal hurdle plate and the thin plate as shown in FIG.
Accordingly, the leakage of the fluid increases, and the flow rate efficiency decreases. The hurdle plate 3A having the curvature shown in FIG. 3 attempts to minimize the gap between such steel plates.

The height of the hurdle plate 3A is gradually increased toward both ends. As shown in FIG. 5C, the radius of curvature r of each hurdle plate increases toward the both ends as shown in FIG. If the hurdle plate 3A is gradually reduced, the top of the hurdle plate 3A gradually increases.

FIG. 4 shows yet another embodiment of the present invention.
The cross section in the thin plate width direction of the pad body 1A is formed in a low M-shape at the center, and a plurality of hurdle plates 3B are arranged in parallel to the plate direction on both sides of the M-shaped cross section excluding the center. The upper side of the hurdle plate 3B has the same curvature, and the height of the hurdle plate 3B is increased toward both ends by the inclination of the pad body 1A. FIG. 5D shows the front shape of each hurdle plate 3B.

As described above, in any of the embodiments of the present invention, the shapes of the hurdle plates are not the same, but the angle θ formed by the line connecting the tops of the hurdle plates arranged on one side with respect to the horizontal plane is different from that of the hurdle plate. The distance d between adjacent hurdle plates can be specified in a common range. That is, as shown in FIGS. 6A and 6B, θ is 0 ° to 15 °.
And d is in the range of 15 to 50 mm. Further, it is desirable that the thickness t of the hurdle plate itself is also in the range of 8 to 15 mm. Note that the angle θ in FIG.
Is the inclination of the upper surface of the pad body 1A in the embodiment of FIG.
Although shown as an angle, virtually each hurdle plate
It is the same as the angle between the line connecting the tops and the horizontal plane.

By maintaining the angle θ and the interval d in the above ranges, as shown in FIG. 7, the traveling thin steel sheet shifts its widthwise position in the widthwise direction from the normal position 4a to the right side. When the hurdle plate 3 is shifted (meandering) to the shifted position 4b, the gap between the shifted end of the steel plate and the hurdle plate 3 is narrowed, and a vortex is generated between the hurdle plates near the end of the steel plate. Of the fluid that blows out from the steel sheet in the width direction of the steel sheet, thereby increasing the pressure (static pressure) P _c below the steel sheet end on the shifted side, and raising the steel sheet end. (See dashed line). When one end (displaced side) of the thin steel sheet is lifted to the position 4c, the steel sheet returns to the lower side as shown by the arrow due to the weight of the steel sheet, whereby the thin sheet returns to the normal running line again (centering). Will be.
Such a centering effect is a synergistic effect of the angle θ and the interval d in an appropriate range.

FIG. 8 shows the synergistic effect of the angle θ and the distance d in an easy-to-understand manner. The hatched portion (θ: 0 to 15 °, d: 15 to 50 mm) in the center is effective. Represents a range. If the angle θ between the arranged hurdle plates is less than 0 °, the hurdle effect, that is, the fluid cannot be effectively prevented, and the centering function of the steel plate cannot be performed. If θ exceeds 15 °, the hurdle plate has an effect of damping the fluid, but the step of the hurdle plate is so steep that the steel plate comes into contact with the plate before centering. For the above reasons, the angle θ is in the range of 0 ° to 15 °.

On the other hand, if the distance d between adjacent hurdle plates is less than 15 mm, the gap between the hurdle plates is too long, and the intended flow of fluid (vortex) between the hurdle plates.
Even if the steel sheet meanders and moves to one side, the fluid will pass through between the hurdle plate and the end of the steel sheet, and the above-described damping effect of the fluid and the effect of lifting the steel sheet cannot be expected.
Conversely, if the distance d exceeds 50 mm, the distance between the hurdle plates becomes too large, so that no vortex is generated, and the desired hurdle effect does not occur. Therefore, the interval d is set in the range of 15 to 50 mm.

Further, by arranging a plurality of hurdle plates stepwise as in the present invention, the fluid flowing in the thin plate width direction is also prevented from flowing in a stepwise manner, and combined with the fluid flow in the thin plate longitudinal direction. Accordingly, the thin plate and the pad body flow outward in a well-balanced manner in a planar manner, and a suitable static pressure is generated. Moreover, the stepwise hurdle plate increases the flow rate efficiency. In particular, in the case of arranging a hurdle plate having an upper side having a curvature, the curvature corresponding to the curvature of the thin plate curved at the pad position (curvature radius r: 4 to (About 20 m), the fluid is consumed without waste, and the flow rate efficiency can be further improved.

[0028]

As described above, according to the non-contact support device of the present invention, even if a thin plate meanders, an excellent centering function for returning the thin plate to a normal line, and a fluid ejected from the slit nozzle can be efficiently discharged. It can be controlled to increase the flow rate efficiency, and is optimally used as a non-contact holding device for a horizontally traveling thin plate, particularly a horizontal non-contact supporting device at the time of heat treatment or hot dip plating of a thin steel plate.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a support device of the present invention.

FIG. 2 is a perspective view showing another embodiment of the support device of the present invention.

FIG. 3 is a perspective view showing another embodiment of the support device of the present invention.

FIG. 4 is a perspective view showing still another embodiment of the support device of the present invention.

5 (a), (b) and (C) are front views of the hurdle plates of FIGS. 1, 2 and 3. FIG.

FIG. 6 is a view for explaining angles and intervals of hurdle plates.

FIG. 7 is an explanatory view showing the function of the hurdle plate of the present invention.

FIG. 8 is a view for explaining a synergistic effect between the angle and the interval of the hurdle plate.

FIG. 9 is a perspective view showing a specific example of a conventional non-contact holding means for a band plate.

FIG. 10 is a perspective view showing still another embodiment of the support device of the present invention.

FIG. 11 is a perspective view showing still another embodiment of the support device of the present invention.

[Explanation of symbols]

 1, 1A pad body 2 slit nozzle 3, 3A, 3B hurdle plate 4 thin plate 5 closing plate

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Noriyuki Hanada 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division (56) References JP-A-61-210131 (JP, A) 55-74761 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65H 20/10

Claims (6)

(57) [Claims] 1. A non-contact support device for arranging a pad for ejecting a fluid immediately below a thin plate traveling in a horizontal direction and holding the thin plate in a non-contact supporting state, wherein the pad runs on a surface of the pad facing the thin plate. The length of the slit perpendicular to the direction is thin
A plurality of horizontal hurdle plates parallel to the running direction of the thin plate are formed on both sides of the pad body surface provided with the slit nozzle in the width direction of the thin plate, while forming a rectangular fluid ejection slit nozzle having a width not larger than the minimum width of the plate. Provided at substantially equal intervals. 2. The non-contact support device according to claim 1, wherein the height of the plurality of horizontal hurdle plates is increased from the center of the pad toward both ends. 3. A non-contact support device for arranging a pad for ejecting fluid just below a horizontally running thin plate and holding the thin plate in a non-contact supporting state, wherein the pad has a surface facing the thin plate. A fluid jet slit nozzle for generating a static pressure between the surface and the thin plate is formed, and a plurality of upper sides each of which is parallel to the running direction of the thin plate are provided on both sides of the pad body surface provided with the slit nozzle in the thin plate width direction. A hurdle plate having a curvature is provided at substantially equal intervals, and the height of the hurdle plate is gradually increased from the center side toward both end sides. 4. A non-contact support device in which a pad for ejecting a fluid is disposed immediately below a thin plate traveling in a horizontal direction and the thin plate is held in a non-contact support state, a cross section of the pad in a thin plate width direction is a central portion. In the M-shaped surface of this pad, a fluid ejection slit nozzle is provided at a low position in the center and a plurality of upper surfaces parallel to the running direction of the thin plate are provided at inclined positions on both sides. A thin plate non-contact support device, wherein hurdle plates having a curvature are provided at substantially equal intervals. 5. An angle θ between a line connecting the top of each hurdle plate on one side of the slit nozzle and a horizontal plane is 0 ° to 15 °.
°, and the distance d between adjacent hurdle plates is 1
The support device according to any one of claims 1 to 4, wherein the support device has a range of 5 to 50 mm. 6. A fluid damming closing plate having a height equal to the height of the horizontal hurdle plate is provided at the front end and the rear end of the plurality of horizontal hurdle plates in the running direction.
6. The non-contact support device according to claim 5.