JP3095998B2 - Apparatus for changing the direction of movement of a strip and a method for measuring the flying height of the end of the strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral wound while being floated by a fluid ejected from a peripheral surface of a cylindrical body, which is used when a plurality of processes are continuously performed on a strip such as a steel strip. The present invention relates to a device for changing the direction of travel of a strip material to be guided in a shape, and a method of measuring a flying height at an end in the width direction of the strip material guided thereby.

[0002]

2. Description of the Related Art When a plurality of processes are continuously performed on a steel strip, the traveling direction of the steel strip may be changed between the processing apparatuses due to a layout problem of the entire equipment. And, as the strip-shaped material traveling direction changing device used at that time, the steel strip is helically wound around the peripheral surface in a floating state by gas ejected from the peripheral surface of the cylindrical body toward the surface of the steel band. (See Japanese Patent Application Laid-Open No. 6-340360).

[0003]

In such a device for changing the direction of movement of the strip material, since the steel strip is guided while being spirally bent, the floating amount from the peripheral surface of the cylindrical body is different at both ends in the width direction, and the twisting is caused. It will be passed through in a state where it is set. Due to this, there is a problem that the steel strip is not stably passed, and the steel strip surface comes into contact with the peripheral surface of the cylindrical body or high-speed passing becomes difficult.
The prior art has not proposed a useful method for accurately measuring the flying height at the widthwise end of the steel strip.

[0004] That is, in order to measure the flying height at the width direction end of the steel strip, for example, a levitation meter arranged above both ends in the width direction in accordance with the width of the steel strip at each position is used. As shown in FIG. 5, when the sheet width of the steel strip S to be passed is increased, as shown in FIG. 5, the levitation meters 3a and 3b arranged in accordance with the preceding sheet width have the width direction ends. The flying heights a ₁ and b ₁ on the center side of the part position are measured, and the necessary flying heights a ₂ and b ₂ at the end portions in the width direction are not measured. Further, when the width of the steel strip to be passed is reduced, the arrangement of the levitation meters 3a and 3b is shifted to the outside of the steel strip S, and the levitation is not measured. As described above, unless the position of the levitation meter is changed each time the width of the steel strip to be passed is changed, the levitation amount at the end portion in the width direction cannot be accurately measured.

[0005] In addition, according to the width of the steel strip to be passed, the levitation meter moves to a position outside the center point of the regular traveling path of the steel strip by, for example, half the width of the steel strip. Also,
As shown in FIG. 6, the steel strip S that is actually guided is a regular traveling path in the width direction (A in FIG. 6 is the center in the width direction of the regular traveling path, and L ₀ is the center in the width direction of the steel strip S). ), The flying height meters 3a, 3b
Accurate measurement cannot be performed because the measurement position is displaced.
Further, it is difficult to make the arrangement of the levitation meter follow the displacement of the steel strip as described above.

The present invention has been made in view of such problems of the prior art, and changes the traveling direction of a strip-shaped material in which the strip-shaped material is spirally guided while being floated by gas ejected from the peripheral surface of a cylindrical body. It is an object of the present invention to provide a useful and simple method and apparatus that can accurately measure the flying height at each end of a steel strip in the width direction.

[0007]

According to a first aspect of the present invention, a belt-like material is spirally floated along a peripheral surface of a cylindrical body by a fluid jetted from the peripheral surface of the cylindrical body. In the method of measuring the flying height of the end portion of the strip material, the floating amount of the strip material from the peripheral surface is measured on a straight line intersecting the traveling direction of the strip material. Flying height detecting means for detecting at a plurality of points on the center side from the end of the strip material, and shift amount detecting means for detecting a shift amount in the linear direction from a regular traveling path of the actually guided strip material. And calculating a floating amount of an end portion of the strip-shaped material on the straight line based on a plurality of floating amount detection values from the floating amount detecting means and a deviation amount detection value from the deviation amount detecting means. Measurement of the floating height of the end of the strip of the strip moving direction changing device To provide a method.

The invention according to claim 2 is a belt-like material which changes its traveling direction while guiding the material in a spiral manner in a floating state along the peripheral surface by the fluid jetted from the peripheral surface of the cylindrical body. In the direction changing device, a floating amount detecting means for detecting the floating amount of the strip from the peripheral surface at a plurality of points on the center side from the end of the strip in a straight line intersecting with the traveling direction of the strip, and actually guiding Displacement amount detecting means for detecting the displacement amount of the strip material from the regular traveling path in the linear direction, and a plurality of floating amount detection values from the flying amount detecting means and deviations from the displacement amount detecting means. Based on the amount detection value, the end flying height calculation means for calculating the floating amount of the end of the strip-shaped material on the straight line, and when the flying height calculation value from the end flying height calculation means is equal to or less than a predetermined value, Warning means to notify of the danger of the strip material coming into contact with the cylindrical surface Providing a strip material traveling direction changing apparatus characterized by comprising a.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic front view showing the configuration of a strip-shaped material traveling direction changing device to which an embodiment of the present invention is applied.

As shown in FIG. 1, the device for changing the direction of travel of a strip material includes a steel strip (strip material) on a semicircular surface 11 of a cylindrical body 1.
A spiral band-shaped guide surface 2 that faces the S surface is provided,
The entire surface of the guide surface 2 is provided with a fluid ejection port for ejecting the fluid (gas or liquid) introduced into the cylindrical body 1 toward the surface of the steel strip S. Further, the width of the guide surface 2 is formed wider than the width of the steel strip S to be passed. Therefore, the traveling direction of the steel strip S introduced into the belt-shaped material traveling direction changing device is changed while being spirally guided in a floating state along the guide surface 2.

On the other hand, the starting point and the ending point of the guide surface 2 of the strip-shaped material advancing direction changing device include a steel strip S on a straight line C (a straight line intersecting the traveling direction of the steel strip) along the axial direction of the cylindrical body 1.
A levitation meter (a levitation amount detecting means) composed of, for example, a laser displacement meter at a position closer to the center than both end faces in the width direction.
3a and 3b are provided. Each flying height meter 3a, 3b
The levitation meter 3a is attached to the tip of a bracket that stands upright from the outer peripheral surface of the guide surface 2 of the cylindrical body 1 and is bent toward the upper surface side of the steel strip S. The levitation meter 3b is arranged on the side where the introduction angle to the sample 2 becomes an acute angle (the acute angle side), and on the side where the introduction angle becomes an obtuse angle (the obtuse angle side).

The entrance and exit sides of the guide surface 2 of the device for changing the direction of travel of the strip are provided with two positions along the width direction of the steel strip S (direction perpendicular to the longitudinal direction of the steel strip). Detection device 4
A shift amount detecting means constituted by a and 4b is provided. Each of the position detecting devices 4a and 4b is, as shown in FIG.
For example across the steel strip S is composed of a projector which is disposed opposite the light receiver, the widthwise end surface position L ₁ of the acute angle side of the position detector 4a is steel strip S, the position detecting device 4b is obtuse steel strip S the widthwise end surface position L ₂ of the side, set at an acute angle side, predetermined point B
Each distance is detected as a distance from the object.

As shown in FIG. 3, the position detection values L ₁ and L ₂ from the position detection devices 4a and 4b are separately input and output from the controller 5 as shown in FIG. Means 51 is input to the shift amount calculator 51, and the shift amount calculator 51 calculates the position of the regular line center (the center line in the width direction of the regular steel strip conveying passage) at the position A (the distance from the predetermined point B) using the following equation (1). ) Is calculated in the sheet width direction, and from this and the spiral angle θ of the guide surface 2 of the device for changing the traveling direction of the strip-shaped material, the deviation D on the straight line C is calculated using the following equation (2). The calculated value is output to an end flying height calculator (end flying height calculation means) 52.

D = (L₁+ L_Two) −2−A ‥‥ (1) D = d / sin θ ‥‥ (2)
Upper amount detection value g₁, G_TwoAnd deviation from the deviation calculator 51
D is input and these values are set for the levitation meters 3a and 3b.
From the spacing X and the width W of the steel strip S in the straight line C direction,
Flying height G at the end face position on the acute angle side of band S₁The following (3)
Using the formula, the flying height G at the position of the end face on the obtuse angle side of the steel strip S_Two
Is calculated using the following equation (4), and the calculated flying height of each end is calculated as follows.
G₁, G _TwoTo the contact danger judgment calculator (warning means) 53
Power.

G ₁ = (g ₁ + g ₂ ) / 2− (W / 2−D) (g ₂ −g ₁ ) / X ‥‥ (3) G ₂ = (g ₁ + g ₂ ) / 2− (W / 2 + D) (g ₂ −g ₁ ) / X ‥‥ (4) Here, as shown in FIG. 4, the steel at the regular line center position (the middle position between the two levitation meters 3a and 3b) A Obi S
Is expressed by the following equation (5): α = (g ₁ + g ₂ ) / 2 ‥‥ (5) The difference between the height α and the height G ₁ at the end on the acute angle side ( α-G
₁ ) using β, the height α and the difference γ between (G ₂ −α) and the height G ₂ at the end on the obtuse angle side, and the following equation (6) is established by similarity of a triangle. β: (W / 2−D) = (g ₂ −g ₁ ): X = γ: (W / 2 + D) ‥‥ (6) From these equations (5) and (6), the above equation (3) and Equation (4) is derived.

The contact danger determination computing unit 53 compares a predetermined threshold value G ₀ of the floating amount at the end with the floating amount G ₁ at the position of the end face on the acute angle side of the steel strip S, for example, G ₁ ≦ G _0. Then, a signal K for sounding an alarm is output to the alarm device (alarm means) 6 when the following condition is satisfied.

Therefore, the levitation meters 3a and 3b are arranged in accordance with the minimum width of the steel strip S to be threaded and the assumed maximum deviation amount, so that both the levitation meters 3a and 3b are arranged in the steel strip S. If it is set so as not to deviate from the height, the strip width of the steel strip S changes or the progress of the steel strip S is shifted in the strip width direction even though the levitation meters 3a and 3b are fixedly arranged. Even
The floating amount of the steel strip S at both end face positions along the straight line C is accurately measured. Further, since the risk of such accurately measured steel strip using a flying height G ₁ at an acute angle side end surface position of the S contact between the guide surface 2 and the steel strip S is determined, the exact dangerous Since the determination is performed, the effect of preventing contact between the steel strip S and the guide surface 2 is high.

In the above embodiment, the flying height meters 3a,
Although the example in which 3b is arranged on the upper surface side of the steel strip S is described,
It may be arranged on the lower surface side of the steel strip S, that is, between the steel strip S and the guide surface 2. Further, in the above embodiment, the flying height is detected at two points on the straight line C by the two flying height meters 3a and 3b, but the detection points of the flying height are not limited to two points. When the number of floating points is two, the cross-section of the steel strip S is regarded as a straight line and the end floating amount is calculated. However, if the number of detected floating points is three or more, the bulging of the steel strip S is approximated by a curve. More accurate measurement of the flying height of the end portion in consideration of the dents and dents becomes possible.

Further, the reference line for measuring the flying height of the end portion is not limited to the straight line C along the axial direction of the cylindrical body 1, but a straight line intersecting with the traveling direction of the steel strip S (for example, the traveling of the steel strip S). Any length may be used as long as it is on a straight line perpendicular to the direction, that is, a straight line along the plate width direction), and a plurality of levitation meters may be provided on the center side of the end of the steel strip S on the straight line.

The measurement position of the flying height at the end in the traveling direction of the steel strip S is not limited to the start point and the end point of the guide surface 2 but may be a halfway point. The displacement may be calculated by the displacement calculator 51 of the controller 5 from the displacement on the entrance side and the displacement on the exit side of the guide surface 2, for example.

In FIG. 1, the position detecting devices 4a, 4
If b is arranged along the straight line C, d calculated by the above equation (1) may be directly output as D from the shift amount calculator 51.

In the case where a steering roll or the like is disposed on the entrance side of the guide surface 2 and the displacement on the entrance side is controlled to be "0", the entrance-side displacement amount detecting means is provided. In order to calculate the flying height at the starting point of the guide surface 2, D = 0 in the above equations (3) and (4), and the flying heights G ₁ and G at the end are calculated.
₂ may be calculated.

[0023]

As described above, according to the first aspect of the present invention, in the device for changing the traveling direction of a strip material, the strip material is guided spirally while being levitated by the fluid ejected from the peripheral surface of the cylindrical body. The flying height at each end of the band in the width direction can be measured accurately and easily.

According to the second aspect of the present invention, accurate danger judgment is performed based on the flying height at the position of the end face of the steel strip that is accurately measured, so that the effect of preventing contact between the steel strip and the guide surface is high. Become.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a band-shaped material traveling direction changing device to which an embodiment of the present invention is applied.

FIG. 2 is a sectional view showing a reference point of a position detection value by the position detection device shown in FIG.

FIG. 3 is a block diagram of a controller.

FIG. 4 is a cross-sectional view for explaining a method of deriving an equation for calculating an end flying height.

FIG. 5 is a cross-sectional view for explaining a problem of the related art.

FIG. 6 is a cross-sectional view for explaining a problem of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical body 2 Guide surface (peripheral surface) 3a, 3b Flying height meter (floating amount detecting means) 4a, 4b Position detecting device (deviation amount detecting means) 5 Controller 6 Alarm device (warning means) 51 Deviation amount calculator (deviation) Amount detecting means) 52 End flying height calculator (End flying height calculating means) 53 Contact danger judgment calculator (Alarm means) S Steel strip (Strip) C Straight line intersecting with the traveling direction of the strip

Continuation of the front page (51) Int.Cl. ⁷ identification code FI G01B 21/02 G01B 21/02 Z (58) Investigation field (Int.Cl. ⁷ , DB name) B65H 23/32 B21B 39/20 B21D 43 / 00 B65H 20/14 B65H 23/032 G01B 21/02

Claims (2)

(57) [Claims] 1. A strip-shaped member for changing the direction of travel of a strip-shaped member while guiding the strip-shaped member spirally in a floating state along the peripheral surface by a fluid ejected from a peripheral surface of a cylindrical body. In the end part floating amount measuring method, a floating amount detecting means for detecting the floating amount of the strip from the peripheral surface at a plurality of points on the center side from the end of the strip in a straight line intersecting with the traveling direction of the strip, A shift amount detecting means for detecting a shift amount of the strip-shaped material that is actually guided from the regular traveling path in the linear direction, wherein a plurality of floating amount detection values from the floating amount detecting means and the shift amount are provided. A method for measuring the floating amount of the end portion of the strip material in the device for changing the traveling direction of the strip material, wherein the floating amount of the end portion of the strip material on the straight line is calculated based on the detected value of the shift amount from the detecting means. 2. A device for changing the direction of travel of a strip-shaped material, which guides the strip-shaped material spirally in a floating state along said peripheral surface by means of a fluid ejected from the peripheral surface of a cylindrical body, A floating amount detecting means for detecting the floating amount of the material from the peripheral surface at a plurality of points on the center side from the end of the linear material in a straight line intersecting with the traveling direction of the material, and A shift amount detecting means for detecting a shift amount in the linear direction from a regular traveling path; and a plurality of floating amount detected values from the floating amount detecting means and a shift amount detected value from the shift amount detecting means. An end levitation amount calculating means for calculating a levitation amount of the end portion of the strip material on the straight line, and when the levitation amount calculation value from the end levitation amount calculation means is equal to or less than a predetermined value, the band material surface is cylindrical. Alarm means for informing the user of the danger of contact with the peripheral surface Belt-like material traveling direction changing device to.