JP3511795B2 - Device for changing the direction of passing of strip material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to conversion of a strip material made of a cold rolled steel plate or the like in a strip passing direction, and a strip strip for winding a running strip material on a floater and converting the strip traveling direction in a non-contact state. The present invention relates to a sheet passing direction changing device.

[0002]

2. Description of the Related Art As a strip passing direction changing device for changing the strip passing direction of a strip-shaped material in a non-contact state, there is a bend type strip passing direction changing device (see FIG. 3) for changing the strip passing direction in a vertical plane. There is a helical-type strip passage direction conversion device (see FIG. 1) that spirally wraps around a floater with a predetermined helix angle to convert the strip passage direction. These strip direction changers
It is considered useful because it can change the sheet passing direction of the belt-shaped material without contacting the floater, that is, without causing scratches.

A conventional strip-passing direction changing device for floating-supporting a strip-shaped material such as a steel strip and changing the strip-passing direction in a non-contact state is described in, for example, Japanese Patent Application Laid-Open No. 51-25274. Things are known.

As shown in FIGS. 8 and 9, these devices have a cylindrical floater 50 around which a strip 52 is wound as a main body, and a surface (guide surface) L on the surface of the floater 50 for guiding the strip 52. A plurality of ejection ports 51 are provided along the line. The plurality of ejection ports 51 are opened at equal intervals along the guide surface, and the fluid supplied into the floater 50 can be ejected toward the inner surface of the strip member 52. Conventionally, the opening area of each of the ejection ports 51 is set to the same opening area for the purpose of making the supporting pressure for supporting the strip-shaped member 52 uniform along the guide surface.

Further, guide rolls 53 and 54 for guiding the strip-shaped member 52 are provided on the inlet side and the outlet side of the strip-shaped member 52 with respect to the floater 50. And
The belt-shaped material 52 that has been conveyed is guided by the guide roll 53 on the entrance side.
And is obliquely wrapped around the guide surface provided on the surface of the floater 50, and is levitationally supported from the surface of the floater 50 at a predetermined support pressure by the gas ejected from the ejection port 51, so that a non-contact state is achieved. The passing direction is changed with
Then, it is sent to the next process through the guide roll 54 on the delivery side.

The above description has been made with respect to the helical type device, but the bend type device has the same structure.

[0007]

In the conventional plate passing direction changing device as described above, the opening areas of the jet outlets 51 are set equal to each other, and the jet flow rates from the jet outlets 51 are set to be the same. The support pressure of the jetted fluid along the guide surface is set to be equal, and thereby the floating amount of the strip 52 wound around the floater 50 is made uniform along the guide surface.

However, when the device is set so that the belt-shaped member 52 is wound around the floater 50 vertically, it is wound around the guide surface above the virtual horizontal plane passing through the center of the floater 50 due to the influence of gravity. At the portion of the strip-shaped member 52 that is present, the amount of levitation from the guide surface becomes smaller than the target levitation amount due to the gravity acting on the strip-shaped member 52 itself, and the strip-shaped member that is wound around the guide surface below the virtual horizontal plane. 52
In the portion, the levitation amount from the guide surface becomes larger than the target levitation amount due to the gravity acting on the strip member 52 itself. That is, since the influence of gravity along the guide surface is not uniform, the flying height difference occurs along the guide surface.

As described above, when the device is set so that the strip-shaped member 52 is wound up and down, it is difficult for the conventional strip conversion device to keep the floating amount of the strip-shaped member 52 along the guide surface constant. There is a problem that is. In particular, the strip-shaped member facing the upper guide surface may contact the guide surface due to gravity.

Further, in the helical type plate passing direction changing device, the belt-shaped member 52 is twisted and wound around the floater 50 to change its direction, so that the belt-shaped member 52 moves downward from the upper guide surface. If the flying height changes during the transition from the upper guide surface to the lower guide surface or from the upper guide surface to the lower guide surface, the belt-shaped member 52 fluctuates in the width direction during the transition. For this reason, as the strip passing speed increases, the strip-shaped material 52 that has come out of the floater 50
There is a possibility that the meandering that occurs in the area will become large and the strip-shaped material 5
2 may come into contact with the surface of the floater 50 to cause scratches and the like.

For this reason, when the conventional helical sheet passing direction changing device is used and the strip member 52 is wound up and down around the floater 50, in order to prevent the above problem, the strip member 52 is passed through the strip. I have no choice but to slow down.

The present invention has been made by paying attention to the above-mentioned problems, and it is possible to suppress the change in the floating amount of the strip-shaped member during the direction change of the strip-shaped member due to the influence of gravity. An object is to provide a direction changing device.

[0013]

In order to solve the above-mentioned problems, the strip direction changing device for a strip-shaped material according to claim 1 of the present invention winds the traveling strip-shaped material up and down along a guide surface. In the non-contact type sheet passing direction changing device, which is equipped with a floater for changing the sheet passing direction of the belt-shaped member, and which supports the belt-shaped member in a floating manner by the fluid ejected from a large number of ejection ports formed on the guide surface, The surface is divided into an upper guide surface and a lower guide surface with an imaginary horizontal plane passing through the center of the floater as a boundary, and the supporting pressure of the strip material by the fluid ejected from the upper guide surface is reduced by the fluid ejected from the lower guide surface. The feature is that it is set larger than the supporting pressure of.

In the present invention, even if the strip-shaped material is wound around the floater up and down, since the supporting pressure on the upper guide surface side is relatively large, the lower side is affected by the gravity acting on the strip-shaped material. The decrease in the flying height of the upper guide surface with respect to the guide surface can be offset.

Here, it is preferable that the supporting pressure on the upper guide surface side is less than twice the supporting pressure on the lower guide surface side for economical reasons such as jet flow rate. Next, in the invention described in claim 2, in contrast to the invention described in claim 1, the supporting pressure of the strip-shaped material by the fluid ejected from the upper guide surface is set to P _U, and the fluid ejected from the lower guide surface is used. Let the support pressure of the belt-shaped member be P _L , the tension generated in the belt-shaped member be T, the mass of the belt-shaped member wound around the upper guide surface be W _U, and be wound around the lower guide surface. It is characterized in that the supporting pressures P _U and P _L satisfying the following formula (1) are set, where W _L is the mass of the strip-shaped member and g is the gravity.

[0016] For example, the strip material is a steel plate, and the density of the steel plate is 7800.
kg / m ³ , thickness 0.5 mm, length 5 m, width 1 m, and when the upper guide surface and the lower guide surface have the same length,
It looks like this:

[0017] Therefore, (P _U / P _L ) should be set to 1.08.

In the present invention, by setting the support pressure by the upper guide surface and the support pressure by the lower guide surface so as to meet the above formula (1), the floating amount of the strip-shaped material from the upper guide surface is set. It is set to be approximately equal to the floating amount of the strip-shaped material from the lower guide surface.

This is because the difference in flying height between the average flying height on the floater entry side and the average flying height on the floater exit side, and the ratio (P
_When the relationship with _U / P _L ) was investigated, there was a relationship as shown in FIG. 7, and there was a neighborhood (K in FIG. 7) that met the above equation (1).
This is because the difference in the flying height became zero at the point).

Next, in the invention described in claim 3, in comparison with the structure described in claim 1 or 2, the total opening area of the jet outlet per unit length of the upper guide surface is It is characterized in that the supporting pressure by the upper guide surface is made larger than the supporting pressure by the lower guide surface by making it larger than the total opening area of the ejection port per unit length of the lower guide surface.

The total opening area of the jet outlet means the total opening area capable of jetting the jet fluid formed per unit length of the target guide surface. And as means for making the total opening area of the ejection ports of the upper guide surface larger than the total opening area of the ejection ports of the lower guide surface, for example, changing the opening area of each ejection port or It can be realized by changing the pitch at which is provided.

The unit length is a unit length along the guide surface, that is, along the sheet passing direction. In the present invention, by making the total opening area of the ejection ports per unit length of the upper guide surface larger than the total opening area of the ejection ports per unit length of the lower guide surface, the upper guide surface side Flow rate per unit length from the lower guide surface side is greater than the flow rate per unit length from the lower guide surface side, so that the supporting pressure by the upper guide surface is larger than the supporting pressure by the lower guide surface. Become.

Next, the invention described in claim 4 is the same as the structure described in any one of claims 1 to 3.
The guide surface set on the surface of the floater is characterized by being set in a helical shape with a predetermined helix angle.

That is, in the helical type plate passing direction changing device,
The configuration according to any one of claims 1 to 3 is adopted. As a result, the influence of gravity applied to the belt-shaped material is reduced even in the helical type plate direction changing device in which meandering or the like is likely to occur due to the difference in the flying height.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, the steel strip 2 will be described as an example of the strip-shaped material.

The basic configuration of the plate passing direction conversion device of the present embodiment is the same as that of the conventional device, and as shown in FIG. 1, it has a predetermined spiral angle with respect to the floater 1 which constitutes the main body of the device. The steel strip 2 is wound around and the passing direction of the steel strip 2 is changed. Further, in the device of the present embodiment, the steel strip 2
Is wound around the floater 1 with the wrap angle set to 180 degrees, and the steel strip 2 is passed from the lower side to the upper side to change the direction.

The floater 1 has a cylindrical shape,
On its surface, for example, a large number of ejection openings 3 and 4 are provided on a guide surface (a passage direction of the steel strip 2) L formed in a helical shape along a helix angle of 45 degrees. Each spout 3,4
Communicates with the flow passage provided inside the floater 1 and ejects the fluid supplied to the flow passage at a set pressure. The jet outlets 3 and 4 are formed along the guide surface L at equal pitches. This is realized, for example, by forming the guide surface L portion with punching metal or the like.

Here, the above-mentioned fluid is preferably high-pressure air in terms of cost, but may be composed of other gas such as nitrogen. Further, in FIG. 1, the opening shape of each of the ejection ports 3 and 4 is illustrated as a circular hole, but it may be a rectangular shape or the like, and the ejection ports 3 and 4 are formed by slit-shaped openings or the like. You may. Here, in FIG. 1, 5 is an inflow path of the above-mentioned flow path, and 6 is an outflow path. The inflow path 5 is connected to a blower or the like.

The guide surface L provided on the surface of the floater 1 is divided into an upper guide surface L _U and a lower guide surface L _L by an imaginary horizontal plane H passing through the center P of the floater 1, as shown in FIG. Has been. The ejection ports 3 and 4 formed on both guide surfaces L _U and L _L are formed at the same pitch, but the opening area of each ejection port 3 on the upper guide surface L _U side is set to the lower guide. It is set to be larger than the opening area of each jet port 4 on the surface L _L side. As a result, the total opening area of the ejection ports 3 per unit length of the upper guide surface L _U becomes larger than the total opening area of the ejection ports 4 per unit length of the lower guide surface L _L. That is, larger than the total ejection rate from the lower guide surface L _L is the total ejection flow rate from the upper guide surface L _U, the lower guide surface towards the supporting pressure on the upper guide surface L _U L _L
It is higher than the supporting pressure at.

Next, the operation and action of the plate passing direction changing device will be described. The steel strip 2 is sequentially guided by the guide roll 7 on the entrance side and wound around the floater 1 from below, and is floated and supported by the fluid so that the steel strip 2 is in a non-contact state with the floater 1 and has a predetermined spiral angle from below to above. Then, the sheet passing direction is changed, and the sheets are sequentially sent to the next step via the guide roll 8 on the delivery side.

[0031] At this time, the steel strip 2 portion facing the lower guide surface L _L is the gravity acting on the steel strip 2 itself, apart from the lower guide surface L _L by an amount corresponding to the force of gravity, the upper guide surface L
Strip 2 portion facing the _U is the gravity acting on the steel strip 2 itself, to approach the upper guide surface L _U by an amount corresponding to the force of gravity. However, in the present embodiment, since the supporting pressure by the fluid on the upper guide side is set to be larger than the supporting pressure by the fluid on the lower guide side, the steel strip facing the upper guide surface L _U due to the effect of the gravity is set. 2 and the difference in the flying height of the steel strip 2 facing the lower guide surface L _L can be offset.

Therefore, in the present embodiment, it is possible to cancel the influence of gravity and make the floating amount of the steel strip 2 along the guide surface L constant. At this time, when the influence of gravity is offset to set the flying height on the upper guide surface L _U and the flying height on the lower guide surface L _L to be substantially constant, the tension set for the steel strip 2 is When T is T and the mass of the steel strip 2 wound around the lower guide surface L _L and the upper guide surface L _U, which is obtained in advance from the average plate thickness of the steel strip 2 to be threaded, is W, the following (2) If set so as to satisfy the formula, the floating amount of the steel strip 2 along the guide surface L can be made constant.

(S _U / S _L ) = √ {(T + W × g) / (T−W × g)} (2) where S _U is the opening of the ejection port of the upper guide surface L _U The area is the opening area of the ejection port of the lower guide surface L _L , and g is the gravity.

The jet flow rate for supporting the steel strip 2 is
It is proportional to the opening area of the jet ports 3 and 4, and
The power is proportional to the supporting pressure, and the upper guide surface L_UAnd lower guidance
Surface L _LAre equal areas in the present embodiment. Obey
Then, the above formula (2) is obtained by using the upper guide surface L_USupport pressure at P_U
And the lower guide surface L_LSupport pressure at P_LAnd above strip
Let T be the tension generated in the material, and let the upper guide surface L be_UWinding
W is the mass of the belt_UAnd the above lower plan
Inner surface L_LW is the mass of the strip-shaped material _Lage
It is equivalent to the following equation (3) in the case of

[0035] Further, when the opening areas of the ejection ports 3 and 4, that is, the amount of the ejected fluid from each guide surface L is adjusted based on the equation (2),
It is possible to make the floating amount of the steel strip 2 along the guide surface L constant, but not limited to this. For example, when the steel strip 2 is applied to prevent the steel strip 2 from contacting the guide surface L due to the influence of gravity, the ejection port 3 on the upper guide surface L _U side of the value calculated by the above equation (2) is used. The opening area may be increased so as to increase the flying height on the upper guide surface L _U side.

However, when it is adopted in a helical type plate conversion device as in the present embodiment, since the steel strip 2 is wound around the floater 1 in a twisted state, the flying height changes. As a result, deviation in the plate width direction occurs and it is easy to amplify the meandering on the exit side of the floater 1. Therefore, the above equation (2) is used to cancel the influence of gravity as described above so that the flying height of the upper guide surface L _{U and} the flying height of the lower guide surface L _L become constant. It is desirable to set based on this.

In the above embodiment, the case where the steel strip 2 is wound around the floater 1 from the lower side to the upper side to change the direction is described. It may be a case where the steel strip 2 is wound toward the upper side to change the passing direction.

Further, in the above-mentioned embodiment, the vertical direction is 1
Although the steel strip 2 is set to be wound at a winding angle of 80 degrees, it may be set to another winding angle such as 360 degrees as in the conventional example. Even in this case, the upper guide surface L _U and the lower guide surface L _L may be set separately on the basis of an imaginary horizontal plane H passing through the center P of the floater 1.

Further, in the above embodiment, the helical type plate passing direction changing device has been described, but it may be applied to a bend type plate passing direction changing device as shown in FIG. The arrow in FIG. 3 shows an example of the steel strip passing direction.

In the above embodiment, the case where the axis of the floater 1 is horizontal has been described, but the present invention is not limited to this, and the axis of the floater 1 may be inclined. Even in this case, a virtual horizontal plane H passing through the center P of the floater 1 may be used as a reference.

In the above embodiment, the upper guide surface L
Although described in the case where the respective ejection opening 3 of the _U is realized by setting larger than the ejection ports 4 in the lower guide surface L _L, the lower guide surface supporting pressure on the upper guide surface L _U L _The means for setting the supporting pressure larger than _L is not limited to this. For example, the pitch of the ejection ports 3 formed on the upper guide surface L _U may be smaller than the pitch of the ejection ports 4.

Alternatively, as shown in FIG. 4, the interior of the floater 1 is divided into two chambers 9A and 9B with an imaginary horizontal plane H as a boundary.
It is also possible to realize by making the pressure of the fluid supplied to the upper chamber 9A higher than the pressure of the fluid supplied to the lower chamber 9B.

Further, in the apparatus of the above-mentioned embodiment, the opening area of each of the jet outlets 3 and 4 is set to be constant, but means for varying the opening area of each of the jet outlets 3 and 4 is provided, The opening area of each of the jet ports 3 and 4 may be changed according to the steel strip 2 to be threaded.

For example, as shown in FIGS. 5 and 6, on the wall inner surface 1a side of the surface of the floater 1 along the guide surface L, the upper guide surface L _U and the lower guide surface L _L are divided into The movable plates 11 and 12 are arranged along the inner surface 1a of the wall. Each of the movable plates 11 and 12 is a plate member whose outer surface shape has the same curvature as the inner surface of the wall portion.
Also, the openings 11a, 1 having the same shape as the jet outlets 3, 4 are formed.
A large number of 2a are opened at the same pitch, and each opening 11a, 1
2a can be communicated with each of the jet ports 3 and 4. The movable plates 11, 12 are connected to the piston rods of the cylinder devices 13, 14 fixed to the inner wall of the floater 1, and the cylinder devices 13, 14 are driven to drive the floater 1
It is possible to move back and forth in the axial direction of. Then, the movable plate 11 corresponding to the upper guide surface L _U and the movable plate 12 corresponding to the lower guide surface L _L are individually advanced and retracted to be displaced, so that the total opening area of the ejection port 3 of the upper guide surface L _U. The ratio of the total opening area of the jet port 4 of the lower guide surface L _L is set to an appropriate value capable of canceling the influence of gravity depending on the steel strip 2 and the like to be passed.

Although the movable plates 11 and 12 may be arranged on the surface side of the floater 1, the movable plates 11 and 12 are prevented from rising from the floater 1 and the floater 1 in a non-contact state. It is necessary to consider the fluid leakage from the gap between the movable plate 11 and the movable plate 11, 12, and as described above, the floater 1
It is advantageous to provide it on the inner surface side.

Further, in the above embodiment, the supporting pressure on the upper guide surface and the supporting pressure on the lower guide surface are constant on each surface, but the supporting pressure on the guide surface in the vicinity of the vertically facing position is It may be set to be the largest or the smallest. This is because the vicinity of the vertical position on the guide surface is most affected by gravity. For example, in the above-described embodiment, the support pressure at the inlet of the lower guide surface L _L is set to be the smallest, and the support pressure at the outlet of the upper guide surface L _U is set to be the largest.

In the present embodiment, the support pressure is switched above and below the virtual horizontal plane.
It is not limited to this. For example, the supporting pressure of the portion near the virtual horizontal plane may be set to an intermediate supporting pressure. In short, the average value of the support pressure at each guide surface portion may be set so that there is a difference between the upper and lower sides.

[0048]

As described above, when the strip passing direction changing device of the present invention is adopted, the upper portion and the lower portion of the strip during the passage conversion due to the influence of gravity acting on the strip. It is possible to suppress the difference in the floating amount between the belt-shaped member and the floater, and it is possible to avoid the inconvenience that the belt-shaped member comes into contact with the floater due to the influence of gravity to cause scratches.

In particular, when the invention described in claim 2 is adopted, even if the strip-shaped material is wound around the floater in the vertical direction, the floating amount of the strip-shaped material along the guide surface can be made constant. .

As a result, when it is adopted in the helical type plate passing direction changing device as described in claim 4, the change of the flying height due to the influence of gravity can be suppressed, and the meandering of the belt-shaped material can be reduced. It can be suppressed, and the plate passing speed can be increased accordingly.

[Brief description of drawings]

FIG. 1 is a diagram showing a plate passing direction changing device according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a plate passing direction changing device according to an embodiment of the present invention.

FIG. 3 is a view showing a bend type floater.

FIG. 4 is a schematic cross-sectional view showing another example of the plate passing direction changing device according to the embodiment of the present invention.

FIG. 5 is a diagram showing another example of the plate passing direction changing device according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view for explaining an example in which the ejection port is made variable.

FIG. 7 is a diagram showing a relationship between a flying height difference and (P _U / P _L ).

FIG. 8 is a view showing a conventional plate passing direction changing device.

FIG. 9 is a view showing a conventional sheet passing direction changing device.

[Explanation of reference symbols] L guide surface L _L lower guide surface L _U upper guide surface H virtual horizontal plane P floater center 1 floater 2 steel strip 3 jet port provided on the upper guide surface 4 jet port provided on the lower guide surface

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshitoshi Yamashita, 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Chiba Works (56) Reference JP-A-56-127538 (JP, A) JP 60-87156 (JP, A) JP-A 61-49724 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65H 23/32 B65H 20/14 B65H 23/032

Claims (4)

(57) [Claims] 1. A swirl belt which winds a running strip material vertically along a guide surface to change the passage direction of the strip material, and the strip shape is formed by a fluid ejected from a large number of ejection openings formed on the guide surface. In a non-contact type sheet-passing direction changing device that supports materials in a floating manner, the guide surface is divided into an upper guide surface and a lower guide surface with an imaginary horizontal plane passing through the center of the floater as a boundary, and the fluid is ejected from the upper guide surface. A belt-passing direction changing device for a strip-shaped material, wherein a support pressure of the strip-shaped material is set to be larger than a support pressure of the strip-shaped material by the fluid ejected from the lower guide surface. 2. By the fluid ejected from the upper guide surface
The support pressure of the strip is P _UAnd spout from the above lower guide surface
The supporting pressure of the strip material due to the fluid is P_LAnd the above strip
Let T be the generated tension and wrap it around the upper guide surface.
W of the strip material_UAnd wrap it around the lower guide surface
W is the mass of the belt_LAnd the gravity is g
Bearing pressure P that satisfies the following equation_U, P_LSet to
The strip-shaped member according to claim 1, characterized in that
Plate direction changing device. 3. The upper guide surface is formed by making the total opening area of the jet outlet per unit length of the upper guide surface larger than the total opening area of the jet outlet per unit length of the lower guide surface. The strip-passing direction changing device according to claim 1 or 2, wherein the supporting pressure by the surface is made larger than the supporting pressure by the lower guide surface. 4. The guide surface set on the surface of the floater,
The strip passing direction changing device according to any one of claims 1 to 3, wherein the device is set to have a helical shape with a predetermined helix angle.