JPH0321241B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention makes it possible to detect the widthwise position of a rolled material between the stands of a rolling mill with high accuracy even when the rotation angle of the looper arm fluctuates. , relates to a width direction position detection device for a metal strip.

[Prior Art] During rolling operations, the rolled material cannot remain in the center of the rolls due to the conditions during rolling, and as the rolling progresses, it moves toward the ends of the rolls, as shown in Figure 1. It is well known that the phenomenon of
It's called a meander.

It is also known that in order to prevent this meandering, it is important to roll the rolled material under conditions that create a convex crown.

However, in recent years, demands for improving the quality and yield of rolled materials have become stricter, and it is also required to reduce the convex crown as much as possible and to roll the material so that it has a uniform thickness distribution in both the longitudinal and width directions. Therefore, under such conditions, the rolled material tends to meander, making stable operation difficult. In the past, once meandering occurred, it was difficult to prevent it, and in many cases, the operation was stopped and the rolled material that had meandered and was squeezed into the rolling mill was removed.

Next, the properties of the rolled material will be briefly explained.

Figure 1 shows a state in which the rolled material a has shifted to the right side from the center of the work roll b for some reason. In the state shown in Figure 1, there is an imbalance between the rolling forces on the left and right sides. The roll gap becomes uneven between the left and right sides, with the gap on the right side being wider than the left side. By the way, although the circumferential speed of roll b is uniform on the left and right sides, the gap on the right side is wider, so
The volumetric flow rate of the rolled material per unit time is larger on the right side. Also, assuming that the thickness of the rolled material on the entry side is symmetrical, the material will be drawn in faster on the side with a larger volumetric flow rate. As a result, as shown in FIG. 2, the rolled material a becomes inclined with respect to the traveling direction in the plane and advances while being inclined, so that the rolled material a comes closer and closer to the right end of the roll. Therefore, the difference between the left and right roll gaps becomes even larger, and the rolled material a rapidly approaches the right end. This is a phenomenon called meandering.

Previously, once such a situation occurred, it was impossible to recover and operations had to be suspended. Therefore, recently, as shown in Japanese Patent Application Laid-Open No. 57-81913, the position of the rolled material in the width direction is detected using an optical detector, and the roll gap is adjusted based on the signal to prevent the rolled material from meandering. This is possible and has already been put into practical use in some actual machines.

As another conventional example, as shown in Japanese Patent Application Laid-open No. 49-73159, a dimension measuring device having a detection section comprising a light receiver for converting an optical signal into an electrical signal is used. Two detection units are provided at least at one end of the object at a certain distance in the width direction of the object to be measured, and these two detection units that are generated due to vertical fluctuations of the object to be measured are output from the detection unit. There is a method in which the dimension value of the object to be measured measured by one of the detection sections is corrected using a difference signal.

[Problems to be Solved by the Invention] However, in the method disclosed in JP-A-57-81913, a position detector in the width direction of the rolled material is installed between the stands in order to be used in a hot finishing mill. When installing, the following problems occurred. In other words, in a hot rolling mill, a looper is placed between stands, and rolling is performed while controlling the tension of the rolled material by moving the looper roll up and down, but as the looper roll moves up and down, the height of the rolled material changes. changes, so
This causes an error in detecting the width end position of the rolled material.

In addition, even in the case of the method shown in JP-A-49-73159, if the height of the rolled material fluctuates due to the vertical movement of the looper rolls arranged between the stands of the hot rolling mill, the width of the rolled material will change. It is not possible to accurately measure the end position.

In view of the above-mentioned viewpoint, the present invention has been made with the object of making it possible to accurately detect the widthwise position of a rolled material even when the rotation angle of the looper roll fluctuates between stands of a hot continuous finishing mill. It is something.

[Means for Solving the Problems] The first invention is a device for detecting the position in the width direction of the metal strip 5 at the position where the pass level fluctuates. A width direction position detector 6 provided, an angle detector 7 that detects the rotation angle β of the looper arm 3, and a rotation angle β of the looper arm 3 detected by the detector 7 and a preset diameter of the looper roll 4. d. From the reference pass line to the top of the looper roll 4 based on the distance x from the rotation center of the looper arm 3 to the pass line, the distance between rolling mill stands 21, and the distance 1 s from the rolling mill 1b to the width direction position detector 6. a computing unit 8 for calculating the height h of the metal strip 5 and the height y of the metal strip 5 from the reference path line at the mounting position of the width direction position detector 6;
The height y of the metal strip 5 from the reference path line given by, the height Z from the preset reference path line to the lens center position of the widthwise position detector 6, and the reference field of view of the widthwise position detector 6. length L
A calculator 9 calculates the field of view length L' of the width direction position detector 6 at the height y position of the metal strip 5 from the reference path line based on the reference path line given from the calculator 9. The length L' of the field of view of the width direction position detector 6 at the height y position of the metal strip 5 from Calculator 10 for calculating the ratio L'/N of the length of the visual field
and a computing unit 11 that corrects the width end position W of the metal strip 5 based on the ratio L'/N obtained by the computing unit 10. In the device for detecting the position in the strip width direction at the path level fluctuation position, a large number of light receiving elements 6 are used to detect the width end position of the metal strip 5.
a, an angle detector 7 that detects the rotation angle β of the looper arm 3, and a rotation angle β of the looper arm 3 detected by the detector 7 and a preset looper roll 4. The four looper rolls are moved from the standard pass line based on the diameter d of the looper arm 3, the distance x from the rotation center of the looper arm 3 to the pass line, the distance 21 between rolling mill stands, and the distance 1 s from the rolling mill 1b to the width direction position detector 6. A calculator 8 that calculates the height h to the end and the height y of the metal strip 5 from the reference path line at the mounting position of the width direction position detector 6, and the metal strip 5 from the reference path line given by the calculator 8. The height y of the strip 5, the height Z from the preset reference path line to the lens center position of the widthwise position detector 6, the reference field of view length L of the widthwise position detector 6, and the widthwise position detector 6 A computing unit 12 calculates the correction amount ΔW for the distance W from the width direction position detector 6 to the width end position of the rolled material based on the number N of bits of the light receiving element 6a, and the correction amount ΔW given by the computing unit 12. It is equipped with an adder 13 that corrects the distance W to the width end position of the metal strip based on W.

[Operation] In the first invention, the angle detector 7 detects the rotation angle β of the looper arm 3, and the calculator 8 detects the rotation angle β of the looper arm 3 detected by the detector 7 and the preset looper roll 4. , the distance x from the center of rotation of the looper arm 3 to the pass line, the distance 21 between rolling mill stands, and the distance 1 s from the rolling mill 1b to the width direction position detector 6. The height h to the top and the height y of the metal strip 5 from the reference path line at the mounting position of the widthwise position detector 6 are determined, and the calculator 9 calculates the height y from the reference path line given from the calculator 8. Based on the height y of the metal strip 5, the height Z from the preset reference path line to the lens center position of the widthwise position detector 6, and the reference field of view length L of the widthwise position detector 6, the standard is determined. The length L' of the field of view of the width direction position detector 6 at the position of the height y of the metal strip 5 from the reference pass line is determined, and the arithmetic unit 10 determines the position of the height y of the metal strip 5 from the reference pass line. The length L' of the field of view of the widthwise position detector 6 at is divided by the preset total number N of light receiving elements 6a of the widthwise position detector 6 to obtain the ratio of the length of the field of view per 1 bit L'/ N is obtained, and the arithmetic unit 11 calculates the ratio obtained by the arithmetic unit 10.
The width end position W of the metal strip 5 is corrected based on L'/N.

In the second invention, the angle detector 7 detects the rotation angle β of the looper arm 3, and the calculator 8 calculates the rotation angle β of the looper arm 3 detected by the detector 7 and the preset diameter d of the looper roll 4. , from the reference pass line to the top of the looper roll 4 based on the distance x from the rotation center of the looper arm 3 to the pass line, the distance between rolling mill stands 21, and the distance 1 s from the rolling mill 1b to the width direction position detector 6. The height h of the metal strip 5 and the height y of the metal strip 5 from the reference path line at the mounting position of the width direction position detector 6 are determined, and the calculation unit 12 calculates the height h of the metal strip 5 from the reference path line given from the calculation unit 8. 5 height y
and the height Z from the preset reference path line to the lens center position of the widthwise position detector 6, as well as the reference visual field length L at the reference path line of the widthwise position detector 6, of the widthwise position detector 6. Light receiving element 6a
Based on the ratio L/N divided by the total number N, when the rolled material 5 rises by the height y from the reference pass line,
A correction amount ±ΔW for the distance from the width direction position detector 6 to the width end position of the rolled material 5 is determined, and the adder 13 calculates the correction amount ±ΔW determined by the arithmetic unit 12.
The width end position W of the rolled material 5 is corrected based on ΔW.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

First, the principle of this example will be explained with reference to FIGS. 3 to 6.

In FIGS. 3 and 4, 1a and 1b are rolling mills, 2 is a looper, 3 is a looper arm that can be rotated up and down by an appropriate drive device (not shown), and 4 is an upper end of the looper arm 3. The attached looper roll, 5 is a rolled material, and 6 is a widthwise position detector of the rolled material 5.

In the above device, h=rsinβ+d/2−X () holds true due to the geometrical relationship shown in FIG.

Here, r; length d of the looper arm 3; diameter x of the looper roll 4; distance h from the rotation center of the looper arm 3 to the reference pass line; maximum height position β of the rolled material 5 from the reference pass line; Rotation angle of the looper arm 3 with respect to the reference path line Also, from the geometrical relationship shown in FIG. 4, the following holds true: y=h×1s/1...().

Here, y: Rolled material 5 at the installation position of the width direction position detector 6
height 1 from the reference path line; half the distance between the stands of the rolling mills 1a and 1b; 1s; the distance from the center of the stand of the rolling mill 1b close to the widthwise position detector 6 to the widthwise position detector 6, Furthermore, in FIG. 4, Z is the height from the reference path line to the lens center position of the width direction position detector 6.

By the way, as shown in FIG. 5, the total number of light-receiving elements 6a of the width-direction position detector 6 is set to N (hereinafter, the unit of bit is used), and the reference field of view (light-receiving elements) of the width-direction position detector 6 at height Z is 6a) is L, and the length of the field of view of the width direction position detector 6 when the looper roll 4 rises by a height y ₁ from the reference path line is L ₁ ', and also by y ₂ . The length of the field of view when descending is L ₂ ′, and the amount of variation from the reference field of view at that time is △L ₁ (△L ₁ = L−L ₁ ′), respectively.
If △L ₂ (△L ₂ =L ₂ '-L), then the length of the field of view at height Z is the length of the light receiving element 6a of the widthwise position detector 6.
The ratio of the length of the field of view per bit (resolution per bit) obtained by dividing by the total number N is L/N, and the calculation is performed based on the resolution L/N. When the roll 4 moves up and down by amounts y _{1 and} y ₂ , the length of the field of view of the widthwise position detector 6 becomes L ₁ ′,
Therefore, the resolution per 1 bit of the light receiving element 6a changes to L _{1 '} /N and L ₂ '/N. Therefore, unless this resolution is corrected, an error will occur in the detected position of the rolled material 5 in the width direction.

That is, when detecting the widthwise position of the rolled material 5, the distance W from the center of the widthwise position detector 6 to the width end position of the rolled material 5 is determined, as shown in FIG. The distance W from the width direction position detector 6 to the width end position of the rolled material 5 when is on the reference pass line (width end position) is calculated from the geometrical relationship shown in FIG. 6 as follows: W=(N/2− N _L )×L/N (), and assuming that the rolled material 5 moves upward due to the rise of the looper roll 4, W=(N/2−N _Ll ′)×L ₁ ′/ N...() becomes.

Here, N _L ; Number of light-receiving elements 6a that receive light when the rolled material 5 is on the reference pass line N _L1 '; Light-receiving elements 6a that receive light when the rolled material 5 rises by y ₁ from the reference pass line Further, as the rolled material 5 moves upward by _y1 , the number of elements receiving light from the light receiving elements 6a decreases by ΔN=N _L -N _L1 '...().

In other words, if the height of the rolled material 5 changes, the number of light-receiving elements 6a that receive light changes, so if the width end position of the rolled material 5 is not detected taking this into consideration, △W=△N×L/N ...() causes an error in the width end position of the rolled material 5. In other words, the resolution per bit L/N is L ₁ '/N
The exact position cannot be detected unless the Therefore, the vertical amount of the looper roll 4 is calculated by the rotation angle β of the looper arm 3, and the resolution per bit at each time is L'/N (L' is the position of the rolled material 5 at y from the reference pass line. The length of the field of view of the widthwise position detector 6 in a certain case is determined, and the resolution L'/N is determined by the length of the field of view of the widthwise position detector 6.
By multiplying the result obtained by subtracting the number of light receiving elements 6a that receive light from the rolled material 5 from half of the number a, the width end position of the rolled material 5 can always be detected accurately.

Next, a specific example based on this principle will be explained with reference to FIG. 7. In the figure, 7 is the angle detector of the looper arm;
8, 9, 10, and 11 are computing units, and the computing unit 8 has the diameter d of the looper roll, the distance x from the center of rotation of the looper arm to the pass line, half the distance between the stands of the rolling mill, 1, and the distance from the rolling mill to The distance 1s to the width direction position detector is set in advance, and the calculator 9 has the following values:
The height Z from the reference path line to the lens center position of the widthwise position detector and the reference visual field length L of the widthwise position detector can be set, and the calculator 10 includes a widthwise position detector. Total number of light receiving elements N
It is now possible to set

The rotation angle β of the looper arm is detected by the angle detector 7, and the signal thereof is sent to the calculator 8. The calculator 8 calculates the height h from the reference pass line to the top of the looper roll according to the above formula (), and also calculates the height y of the rolled material from the reference pass line at the width direction position detector mounting position according to the formula () is calculated, and the signal is sent to the calculator 9.

In the calculator 9, the length L' of the field of view of the width direction position detector at the position of height y is determined by the formula L'=Z-y/Z・L...( ), and the signal of the field of view length L′ is obtained from the computing unit 10.
The arithmetic unit 10 calculates the resolution L'/N. This signal with the resolution L'/N is sent to the computing unit 11, and the computing unit 11 calculates the formula based on the number N _L ' of light receiving elements receiving the light sent from the width direction position detector. The distance W from the center of the widthwise position detector to the width end position of the compressed material (width end position) is calculated by W-(N/2-N _L ')×L'/N...() . In this way, the resolution per bit of the photodetector is
By considering L'/N, it is possible to determine the accurate width end position even if the height of the rolled material changes, and therefore it is possible to accurately calculate the meandering amount of the rolled material or the plate width. It becomes possible.

FIGS. 8 and 9 show other embodiments of the present invention.

First, the principle of this example will be explained with reference to FIG.
In this example, the standard is not the length of the field of view of the widthwise position detector, but the number of light receiving elements that receive the light from the widthwise position detector, and from the geometrical relationship shown in Fig. 8, N _L ′ = Z -y/Z・N _L ...() holds true.

In addition, when the rolled material 5 rises by y from the reference pass line, the correction amount △W for the distance W from the width direction position detector to the width end position of the rolled material 5 is calculated based on formulas () and (). Then, △W=(N _L −N _L ′)×L/N ...(), and if we put the equation () into the equation () and rearrange it, we get △W=y/Z×L/N ...(xi) holds true. Therefore, when W±ΔW is determined, the width end position of the rolled material 5 when the rolled material 5 moves up and down by y is corrected and determined.

Next, a concrete example based on this principle will be explained with reference to FIG. 9. 12 is an arithmetic unit, 13 is an adder,
Components with the same reference numerals as those shown in FIG. 7 are the same.

The calculation unit 8 calculates the expression () according to the expression (), and the height y of the rolled material from the reference pass line at the width direction position detector mounting position is sent to the calculation unit 12. Then, the correction amount ΔW for the distance W to the width end position is determined by equation (xi), and the signal of the correction amount ΔW is sent to the adder 13. Further, the distance W to the width end position of the rolled material detected by the width direction position detector and which has not been corrected for the influence of the vertical movement of the looper roll is inputted to the adder 13, and the distance W to the width end position of the rolled material 5 that has not been corrected for the influence of the vertical movement of the looper roll is inputted. The distance to the end position (width end position) W±ΔW is determined. Here, + is a sign when the rolled material 5 rises from the reference pass line, and - is a sign when the rolled material 5 descends from the reference pass line.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] According to the metal strip widthwise position detecting device of the present invention, the strip path line can be kept constant in appearance, so even if the rotation angle of the looper arm changes, the position of the rolled material can be kept constant. The width end position can be accurately determined, and meandering control can therefore be performed accurately and reliably, and the width of the rolled material can also be accurately determined.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a state in which the rolled material is moved to one side of the work roll, FIG. 2 is a plan view of FIG. 1, and FIGS. 3 to 6 are explanatory diagrams of an example of the principle of the present invention.
Figure 3 is an explanatory diagram between the stands of a hot finishing mill;
Figure 4 is an explanatory diagram of the case where a widthwise position detector is provided between the rolling mill stands shown in Figure 3, Figure 5 is an explanatory diagram of the principle of the widthwise position detector, and Figure 6 is a diagram showing widthwise position detection. FIG. 7 is an explanatory diagram of an embodiment of the present invention embodying the principle of FIGS. 3 to 6. FIG.
9 is an explanatory diagram of another example of the principle of the present invention, and FIG. 9 is an explanatory diagram of another embodiment of the present invention embodying the principle of FIG. 8. In the figure, 1a and 1b are rolling machines, 2 is a looper, 3 is a looper arm, 4 is a looper roll, 5 is a rolled material (metal strip), 6 is a widthwise position detector,
6a is a light receiving element, 7 is an angle detector, 8, 9, 1
0, 11, and 12 are arithmetic units, and 13 is an adder.

Claims (1)

[Claims] 1. A device for detecting the position in the strip width direction at the pass level variation position of the metal strip 5,
A width direction position detector 6 equipped with a large number of light receiving elements 6a detects the width end position of the metal strip 5; an angle detector 7 detects the rotation angle β of the looper arm 3; The rotation angle β of the looper arm 3, the preset diameter d of the looper roll 4, the distance x from the rotation center of the looper arm 3 to the pass line, the distance between rolling mill stands 21, and the width direction position detector 6 from the rolling mill 1b. 1s distance to
a computing unit 8 for calculating the height h from the reference pass line to the top of the looper roll 4 and the height y of the metal strip 5 from the reference pass line at the mounting position of the width direction position detector 6; The height y of the metal strip 5 from the reference path line given from 8, the height Z from the preset reference path line to the lens center position of the widthwise position detector 6, and the reference of the widthwise position detector 6. Based on the field of view length L, the height y of the metal strip 5 from the reference path line
A computing unit 9 that calculates the field of view length L′ of the width direction position detector 6 at the position, and
Height y of metal strip 5 from reference path line
Length of field of view of width direction position detector 6 at position
an arithmetic unit 10 that divides L' by a preset total number N of light receiving elements 6a of the width direction position detector 6 to obtain the ratio L'/N of the length of the field of view per 1 bit; A width direction position detection device for a metal strip, characterized in that it is equipped with a calculator 11 for correcting the width end position W of the metal strip 5 based on the obtained ratio L'/N. 2 At the detection position in the strip width direction at the pass level fluctuation position of the metal strip 5,
A width direction position detector 6 equipped with a large number of light receiving elements 6a detects the width end position of the metal strip 5; an angle detector 7 detects the rotation angle β of the looper arm 3; The rotation angle β of the looper arm 3, the preset diameter d of the looper roll 4, the distance x from the rotation center of the looper arm 3 to the pass line, the distance between rolling mill stands 21, and the width direction position detector 6 from the rolling mill 1b. 1s distance to
a computing unit 8 for calculating the height h from the reference pass line to the top of the looper roll 4 and the height y of the metal strip 5 from the reference pass line at the mounting position of the width direction position detector 6; The height y of the metal strip 5 from the reference path line given from 8, the height Z from the preset reference path line to the lens center position of the widthwise position detector 6, and the reference of the widthwise position detector 6. A computing unit 12 that calculates the correction amount ±△W for the distance W from the width direction position detector 6 to the width end position of the rolled material based on the field of view length L and the number of bits N of the light receiving element 6a of the width direction position detector 6. and,
A width direction position detection device for a metal strip, comprising an adder 13 for correcting the distance W to the width end position of the metal strip based on the correction amount ΔW given from the arithmetic unit 12.