JPS6165108A - Measuring instrument of width and zigzag of band-like body - Google Patents

Abstract

PURPOSE:To make it possible to measure the width and zigzag of a band-like body even if width variation is large by setting up an ultrasonic range meter to a required separated measuring point position and a height position on the basis of the pass line height signal of the band-like body and the width information of the current band-like body. CONSTITUTION:A pair of ultrasonic range meters 6a, 6b are selected in accordance with the plate width of the band-like body M on a heat expansion line and the angle of a looper roller 5 is measured by a looper angle measuring device to find out the height position of the pass line. The range meter 6a or 6b is vertically moved on the basis of the ultrasonic sensor height position detector to position both the side end surfaces of the band M always in a measurable range even if the pass line is varied. A range signal outputted from the range meter 6a or 6b is inputted to a width/zigzag calculating device to calculate the width and zigzag values. Consequently, measurement from a near distance can be attained and its error can be minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for measuring the width and/or meandering of a strip of hot-rolled steel sheets or the like in a rolling line for hot-rolled steel sheets or the like.

[Conventional technology]

Measuring the width and meandering of this type of strip is extremely important in rolling operations, and has traditionally been carried out using a continuous method.

As shown in FIGS. 6 and 7, a typical example is to install an LTV or CCD camera 51, 51 above both measuring sections of the material M transported by the transport roll 50, and Upon receiving light from the light sources 52 and 52 emitting light to the material M, the side edges of the material M are detected step by step based on the light shielding state by the material M, and based on this, the width and meandering of the material M, or the camper, etc. I tried to get all the information.

[Problem that the invention seeks to solve]

However, when the material M is conveyed at high speed, the material M often floats up from the conveyor roll 50 as shown in Figure 8, and in this case, as is clear from the figure, the broken line is larger than the true width of the material (solid line). In order to avoid errors such as zero when measuring the width of the indicated material, it is necessary to install the camera 51 directly above the side edge of the material. In cases where the material flows or where the material meanderes, it is extremely difficult to control, and even if it were possible, the equipment would be expensive. Furthermore, when the material is a high-temperature material such as a hot-rolled steel plate, the camera is placed above the material, so the lens on the front of the camera is easily contaminated by dust carried by thermal convection, and the rolling roll is cooled. There are also problems such as the water used in the process turning into steam, blocking visibility and reducing accuracy.

There are other measurement methods such as capacitance method and eddy current method, but each method has a narrow measurement range of about 50 m at maximum.
However, the latter method has the disadvantage that it is greatly affected by temperature changes in the target material.

Therefore, in order to solve this problem, the two Motoyamas used an ultrasonic distance meter, which is more resistant to atmospheric environments than conventional optical measuring devices, in Japanese Patent Application No. 59-79076 and others. proposed a method for measuring the width and meandering of a strip by measuring the time it takes for an ultrasonic wave transmitted from a device placed outside the edge of both sides of the strip to reflect back to the side edge of the strip. are doing.

However, when measuring the end face of a strip using an ultrasonic distance meter, there are the following problems.

(1) When the strip width fluctuates widely as in a hot rolling line (for example, 600 to 1800 mm width), it is difficult to detect the end face position.

(2) However, due to the spread of the ultrasonic beam, it is particularly difficult to detect thin strips, and the measurement range of the ultrasonic distance meter cannot be widened.

(3) Due to the fluctuation of the bus line of the steel plate due to the looper,
The steel plate may be located outside the measurable range.

(4) Since the speed of ultrasonic waves depends on the ambient temperature, an error occurs due to the ambient temperature, and the error becomes extremely large when measured from a point n far away from the end surface of the strip.

(Means for Solving the Problems) Among the above problems, in order to solve problems (1), (2) and (4) in particular, according to the present invention, measurement points using an ultrasonic distance meter are provided. is selectably provided at a desired position in the width direction of the strip, and the measuring tube is selected according to the width of the strip.

Further, in order to solve the above problem (3), the height of the measurement point by the ultrasonic distance meter is changed to follow the fluctuation of the bus line of the steel plate at the measurement point.

That is, the present invention measures the width or meandering of a strip, which is installed in a strip rolling line, and measures the width or meandering of the strip, facing outward from both end surfaces of the strip, and measuring the width or meandering of the strip according to the width of the strip. At least one pair of ultrasonic range finders whose remote measurement point positions can be selected, and the ultrasonic range finders are used to select desired remote measurement point positions and heights based on the bus line signal of the strip body and the width information of the current strip body. A device that measures the distance between the ultrasonic distance meter and the side end face of the strip and calculates the width and meandering of the strip based on this method. That is.

(Function) The speed at which sound waves and ultrasonic waves travel in the air is given by equation (1) when the air temperature is T°C.

V=331.5+0.617 (m/sec)...(1
) Therefore, the ultrasonic waves emitted from the ultrasonic distance meter are
When the time it takes for the light to hit the side edge surface of the material and be reflected is t seconds, the distance L between them is expressed by equation (2).

However, in the hot rolling line, red-hot material passes intermittently,
Air temperature is unstable and fluctuates widely.

Therefore, it is difficult to accurately measure Tt and the error is large. The true temperature is TO='l'+ΔT(ΔT:
temperature error), the true distance Lo is given by equation (3).

Therefore, the distance measurement error ΔL due to ΔT is expressed by equation (4).

From this equation (4), in order to reduce the measurement error ΔL, the temperature must be measured as accurately as possible, and in order to reduce t, the ultrasonic distance meter should be moved as close as possible to the material. It turns out that it is necessary.

Normally, various materials with a width of 600 to 1800 am are rolled in a hot rolling lie/line, so if an ultrasonic distance meter is fixedly installed at a position of 2000 am, for example, it is possible to roll a variety of materials with a width of 0 to 700 am.
Distance measurements must be made within a distance range of 20 (10-600) mm, resulting in a large error when measuring small width materials.

In contrast, according to the present invention, by making the measurement position by the ultrasonic distance meter variable in the width direction of the strip, the measurement position, that is, the ultrasonic 0 which allows the rangefinder position to be closer to the material
In this way, measurements can always be made at close range, and the difference in measurements is small. For example, when LO = 0.17111, even if ΔT75 is several degrees Celsius, the error that is a practical problem can be avoided. Therefore, continuous precision measurement of temperature is not essential, and occasional measurement is sufficient.On the other hand, according to the present invention, the measurement position can be changed by following the fluctuation of the bus line of the steel plate at the measurement point. Therefore, even if there is a variation in the ζ line of the steel plate due to the roots ζ, the fixed object 411j can always be measured and kept within the normal range.

(Example) An example of the present invention will be described based on FIG. 2171 to the third screen.

The unimplemented example is applied to a hot rolling line, in which the material M is conveyed over the conveying roll 1 in the direction of arrow E in Fig. 1, and passed between the upper and lower rolls 2 and 3 of the rolling mill. Then it is rolled. The rolling mill for hot rolling has 4D side guides (drive side and free side) on both sides of the person's side to ensure smooth introduction of material into the rolling mill.

There are 4 floors. This side guide 4D.

The positions of the 4Fs are changed in advance depending on the width of the target material, and are usually set at a distance of about 20 myu from one side edge of the material. 5 indicates a root roll, which is provided to stabilize the rolled shape between each stand by applying an appropriate tension to the rolling stock M between the stands. , a plurality of pairs of ultrasonic distance meters 6 (6a, 6a, 6b, 6b) are arranged in the width direction of the material M. In the illustrated embodiment, two pairs of ultrasonic distance meters 6a, 6
A, 6b, and 6b are provided for wide and narrow widths. The ultrasonic distance meter 6 of these companies is, for example, / Linder 7' (7a, 7a, 7b), as will be described in detail later.
, 7b), it is driven up and down by a hydraulic drive mechanism. Ultrasonic distance meter 6a+ 6a for wide width is
As shown in Fig. 2, the ultrasonic range finders 6b and 6b for narrow width are located on the outside of both end surfaces of the wide material and are installed so as to look at this 1"L. During sheeting, it is in the downward retracted position as shown in the second factor, so that it does not become an obstacle to sheet threading, and when threading narrow width materials, it is driven upward by unlinders 7b, 7b, and the narrow width It is placed at an upper operating position facing the lever, which is located on the outside of both end faces of the material.

The unembodied measuring device further includes a distance calculation device @8 (8a + 8a) that takes in the distance signal from the ultrasonic distance meter 6 and calculates the distance to both ends of the material (Il11).

8b, 8b), a width/meandering calculation device 9 (9a, 9b) that calculates the width/meandering of the material based on the calculation results, and selects a calculation output according to the board width and outputs it as the width/meandering amount. Also, an ultrasonic distance meter, more precisely an ultrasonic sensor position detector 11 that detects the height position of the ultrasonic sensor, and a looper angle measuring device that measures the angle of the looper roll 5 are provided. 12, and a bus line height position calculation device 13 that calculates the bus line height position from the looper angle.
and an ultrasonic sensor position control device 14 that controls the ultrasonic sensor height position with the calculated bus line height position as a target;
Means for selecting an ultrasonic distance meter 7"L selected according to the plate width, that is, an ultrasonic distance meter 6a for a wide material, and an ultrasonic distance meter t3b +6b for a 6as narrow material. 15 and a cylinder drive device for driving the cylinder selected based on the ultrasonic distance meter selection command from the selection means 15 in response to a signal from the ultrasonic sensor position control device. 16 are further provided.

To explain the outline of the control based on FIG. 3, first, depending on the width of the material being threaded, the ultrasonic distance to be measured,
! , total pair 6 a, 6 a Ifc is fib, 6b
On the other hand, the angle of the louver roller 5 is measured by the looper angle measuring device 12, and from this measurement angle, the bus line height position of the material M at the ultrasonic distance meter installation position is determined by the bus line calculation device. 13. At the same time, the sensor height position is detected by the ultra-sonic sensor height position detector 11, and the corresponding calculated bus line height position is compared with the above calculated bus line height position (-) so that the sensor height position matches the target. By driving the seven-ring drive device 16 of the acoustic wave ll'I2 distance, the both end surfaces of the material M are always controlled even if there are fluctuations in the bus line of the material M caused by the looper roller 5. It can be located within the measurable range.

Distance signals from each ultrasonic distance meter 6a, 6a, 6b, 6b are sent to a distance calculation device 8a + 8a + 8b, 8
The distance to the end surface on the material side is calculated. The 7" distance thus obtained is manually calculated by the width/meandering calculation devices 9a and 9b for each pair of ultrasonic distance meters.The output selection device 10 calculates the width/meandering amount. Sonic distance meter selection - J = selection command Q from stage 15, then the width and meandering amount for any pair of ultrasonic distance meters are selected J'L, output n is 0 or more The material M to be threaded as shown in
Since the measurement points of the ultrasonic distance meter are selected according to the width of the plate, it is possible to always measure the material M from a close position, and measurement errors can be minimized.

1 and 5 show other embodiments of the invention.

In this embodiment, unlike the first embodiment, in which a plurality of pairs of ultrasonic range finders are arranged in the width direction of the material and are used by switching as appropriate depending on the width of the material to be threaded, a pair of ultrasonic range finders are used. Sonic distance meter 6,
6 is used nl This ultrasonic distance meter is configured to be movable in the width direction of the material. To explain in more detail,
The ultrasonic distance meter 6°6 can be driven in the vertical direction by a vertical drive device such as a cylinder 7.7, and the cylinders 7, 7 are fixed to a widthwise drive device 17.17. It can be driven in the width direction.

The widthwise drive device 17.17 is further equipped with a resistive or magnetic sound device (18.18 in total).

Kimi, @1/111) The control llχ is explained based on Fig. 5.

First, the direction driving device 1f'i, 16 is driven keeping in mind the width of the sliver to be passed through, and the ultrasonic distance meter 6°6 is There is a theory that there is a solid wave distance meter (Kese/Serr standing 11) in response to the bus line Kanagi's bus line Kanagi of 3 charges from the loop use. '? The one that controls everything is the same as the 1L example of actual repentance.

In this embodiment, the output from the displacement meter 18.18 is the ultrasonic 1
When the distance is input to the nog distance along with the distance Jl signal from the 1F meter 6, the positions of both ends of the material are determined.

Further increase the width and meandering of the material from both end positions; 6
The width and meandering are calculated by 1□°σ9.
Even if Ino changes '1 horn, it's 1.;
7 wave distance! ηItii 士・,');
1 big example: It is possible to use 1rC (]゛t, and the ultra-a wave distance, "η (total f))il'jll fixed point all 1
(57), so one measurement peak can be as small as 2. There is an advantage that the mechanism is simple.

In each of the above-mentioned embodiments, it is preferable to provide a reference plate 19i that can be moved upwardly and downwardly, so that when there is no material between the stands c, the reference plate 19 is raised to the measurement range of the total ultrasonic distance meter, and a known ultrasonic distance meter is used. Sound wave 7 (Compare the distance between the soil meter and the reference plate and perform all the calibrations of the distance meter.
[Rubbing. When there is a bow between the stands, that is, during rolling, Kisozaka J! -) is lowered using a 7-liner etc. to a position where it does not interfere with the material.

(Effects) As described above, according to the present invention, by using an ultrasonic range finder, it is possible to determine the width and meandering of the body of band 1 in hot rolling rhino etc. without being affected by the surrounding environment. At the same time, the measurement points of the ultrasonic distance meter can follow all the bus lines, and by setting the number of grooves at the closest position outside the end face of the celestial object, the ultrasonic distance can be The shortcomings of the meter, the problems in the northern area of the measurement area, and the measurement error due to ζ, have come to a head! 1. on 1 Figure 1 to 100 σ) 1m Pah, na 1
1 December Figure 1 is a limited explanatory front view of the first implementation row of Kisadaaki, the 21st threshold is a front view of the same, Figure 13 is a schematic diagram of the same control panel, and Figure 1I is a diagram of the present invention. The explanation front view and Figure 5 of the second embodiment are the same! fi (1@Schematic diagram, No. 614 is a front view of the conventional method, FIG. 7 is a plan view thereof, and No. 81 is an explanatory view of a form of dimensional misrecognition.

~■...l No. 14 5...Lou Shirola [](+]
a, +5 b')...Super Ff i skin h1 large distance Mado 7 (7a, 7b).../renoder 17...width direction, small movement position 18...displacement meter 4? 1 Application for Permission Seikan Metal Engineering Co., Ltd. 1℃ Patent Attorney Mizui Kaoru Iri・j Figure 1 Figure 2, 2 tυ /D Figure 3 Figure 4 Figure 5 Figure 6 Dt One.

Claims (1)

[Claims] (1) A device installed on a rolling line for strips to measure the width or meandering of the strip, facing outward from both end surfaces of the strip and positioning measurement points at distances from the side end surfaces according to the width of the strip. at least one selectable pair of ultrasonic distance meters;
An ultrasonic distance meter that sets the ultrasonic distance meter to a desired remote measurement point position and height position based on a bus line height position detector of a strip body, and a future bus line signal and current width information of the strip body. A device for measuring the width and meandering of a band-shaped object, comprising a drive device, and a device that measures the distance between an ultrasonic distance meter and the measuring end face of the band-shaped object, and calculates the width and meandering of the band-like object based on this. .