JPH06307845A - Roll alignment measuring method - Google Patents

Abstract

PURPOSE:To establish a quick and safe measuring method for the roll alignment. CONSTITUTION:A plurality of rolls 6 are laid in line along a certain reference line 9 to form a roll train 5, and the roll alignment of this train is measurted in such an arrangement that the roll axes are parallel, wherein the sensing end 13 of an ultrasonic distance measuring instrument 11 or a laser apparatus is set, and the distance from the sensing end 13 to the surface of each roll 5 is measured by rotating the end 13 round the axis parallel with the roll axis, or functionally rotating within the end round an axis which is parallel with the roll axis. The shortest distance from the end 13 to the roll surface is calculated on the basis of the rotational angle of the end 13 and the distance obtained, and the position of the roll 6 relative to the reference line 9 is determined through calculation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll alignment measuring method.

The present invention is used to measure the roll alignment of roll rows such as guide rolls and pinch rolls of a continuous casting machine, and rolls for runout tables of a hot rolling machine.

[0003]

2. Description of the Related Art For example, in a continuous casting machine, as the number of charges increases, the bending, wear, bearing damage, etc. of the guide rolls and pinch rolls gradually increase, and the roll alignment error increases accordingly. Incorrect roll alignment causes defects such as cracks in the slab. For this reason, for example, when a predetermined number of charges is reached, the operation is stopped, the roll alignment is measured to adjust the roll alignment, or the roll is replaced.

Conventionally, an arcuate R gauge or a linear gauge curved along a row of rolls is pressed against the surfaces of a plurality of rolls, and a clearance gauge is inserted between these gauges to measure roll alignment. Alternatively, the measurement end is moved along the R gauge to perform automatic measurement.

[0005]

In the above-mentioned conventional roll alignment measuring method, the R gauge is long (for example, 5 mm).
It is inconvenient to handle because it is ~ 6 m). In addition, the measurer must enter the narrow space between the rows of rolls for measurement. Therefore, the measurement work is dangerous, and it is impossible to measure the position where the operator cannot enter. Further, in the automatic measuring method using the R gauge, it takes a long time to insert and move the R gauge.

The present invention provides a rapid and safe method for measuring roll alignment.

[0007]

A roll alignment measuring method of the present invention is a method for measuring roll alignment of a roll row in which a plurality of rolls are arranged along a predetermined reference line so that roll axes are parallel to each other. Set the detection end of a distance measuring device such as laser or ultrasonic wave, and rotate the detection end around an axis parallel to the roll axis, or rotate inside the detection end functionally around an axis parallel to the roll axis. Measure the distance from the detection end to each roll surface, calculate the shortest distance from the detection end to each roll surface based on the rotation angle of the detection end and the measured distance from the detection end, and further, for each roll with respect to the reference line. The position is calculated. In determining the position of each roll with respect to this reference line, in order to approximate the measurement method that minimizes the difference between each roll and the gauge by moving the mechanical reference gauge, for example, with each roll such as the least squares method. The roll alignment measurement accuracy is improved by calculation using a calculation method having a reference line moving function that minimizes the difference from the reference line. In addition, as the reference line,
It may be curved or straight.

The detection end of the distance measuring device is rotated to sequentially scan the surfaces of a plurality of rolls with laser light or ultrasonic waves, and the distance from the detection end to the roll surface is measured. The number of rolls for measuring the distance varies depending on the roll diameter, roll pitch, etc., but is, for example, about 3 to 6. When the distance cannot be measured for all the rolls, the roll is divided into a plurality of sections, and the detection end is moved along the reference line of the roll for measurement. The distance measured is the shortest distance between the detection end and the roll surface. In order to improve the measurement accuracy, it is desirable to move the detection end along the reference line and measure one roll a plurality of times. The rotation angle of the detection end is measured by a known rotation angle measuring device such as a rotary encoder.

Based on the rotation angle of the detection end and the measurement distance,
The position of each roll with respect to the reference line can be calculated geometrically. The calculation is performed by a microcomputer that has a calculation program built therein beforehand.

The measurement accuracy of roll alignment is, for example, about ± 0.2 mm when a laser distance measuring device is used.

[0011]

Since the distance between the detection end and the roll surface is measured using laser or ultrasonic waves, the distance can be measured without contacting the roll surface. Further, since the size of the detection end of the distance measuring device is about 100 mm or less, by inserting the detection end between the rolls, the roll alignment can be measured even in a narrow place where an operator cannot enter. it can.

[0012]

EXAMPLE Roll alignment measurement by a continuous casting machine will be described as an example. FIG. 1 shows the configuration of a roll alignment measuring device. The roll alignment measuring device 11 includes a cylindrical measuring device main body 12, and a tip end portion of the measuring device main body 12 is a detection end 13 rotatable about a cylinder axis. A motor for rotating the detection end 13, a rotary encoder for detecting a rotation angle, a fixed magnet, and the like (all not shown) are built in the measuring device main body 12. A laser oscillator 15 is connected to the detection end 13 via an optical fiber 16 or the like. Detection end 13
A window (not shown) for emitting and entering the laser light 17 is opened at one position on the peripheral surface of the. A photodetector (not shown) for detecting the laser light 17 reflected on the surface of the roll 6 is provided in the detection end 13.

A measuring computer 18 is connected to the measuring device main body 12. The measuring computer 18 controls the rotation angle of the detection end 13 and calculates the position of the roll with respect to the reference line 9 based on the rotation angle and the distance between the detection end 13 and the surface of the roll 6. The calculation program is stored in advance in the storage unit of the measurement computer 18.

A method of measuring the roll alignment by the measuring device configured as described above will be described.

As shown in FIG. 2, the continuous casting machine 1 has a mold 2
A roll row 5 extends downward from the roll row 5. Roll row 5 is A to H with 5 rolls 6 as one section
It is divided into sections, and the measuring devices 12, 13, 15,
18 and the like are moved to measure roll alignment.

Two rolls 6 having the measuring device main body 12 adjacent to each other
And the measuring device body 12 is fixed to the surface of the roll 6 by a fixing metal fitting (magnet base) so that the axis of the measuring device body 12 is parallel to the roll axis. Then, the detection end 1
While irradiating the roll surface with the laser beam 17 from 3, the detection end 13 is rotated at a constant speed. The laser beam 17 sequentially scans the surface of the roll 6 from the roll 6 on the upstream side, and the laser beam 17 reflected by the roll surface enters the detection end 13. The reflected light is converted into an electric signal and input to the measuring computer 18. The measuring computer 18 obtains the shortest distance (measurement distance) between the detection end 13 and the surface of the roll 6 from the electric signal, and further determines the position of the roll with respect to the reference line 9 from the rotation angle of the detection end 13 and the measurement distance. Ask.

When the measurement of one section is completed, the measuring devices 12, 13, 15, 18 and the like are moved to the next section on the downstream side, and the position of the roll is obtained in the same manner as above. At this time, the position of each of the adjacent one or two rolls 6 on the upstream side, which has already been measured, is measured again to obtain an average value, and the measurement accuracy is improved.

An example of a method for obtaining roll alignment based on the rotation angle of the detection end 13 and the distance between the detection end 13 and the roll surface will be described with reference to FIGS. 3 and 4.

Roll radii to be measured r _a , r _b , r _c , and r _d , and roll reference angles θ _{a to be} measured,
θ _b , θ _c , and θ _d are obtained by measurement or calculation before measuring the distance between the detection end and the roll surface.

Next, by using a distance measuring device and a rotary encoder or the like, the shortest distances OA ", OB", OC ", and OD" and the angles θ ₅ , θ ₆ , and Measure θ ₇ .

The position of the apex of each roll is obtained by calculation based on the radius of the roll to be measured. That is, applying the triangular sine-cosine theorem to the triangle OAB,

[Equation 1] And then

[Equation 2] Ask for. Applying the triangular sine-cosine theorem to the triangle OAA ',

[Equation 3] And apply the triangular sine-cosine theorem to the triangle OBB ′,

[Equation 4] Ask for. Similarly,

[Equation 5] Ask for.

From the above results, the following polar coordinates of the vertices A ', B', C'and D'of each roll can be obtained with the O point as a reference. A '(r ₁ , 0) B' (r ₂ , θ ₂ ) C '(r ₃ , θ ₃ ) D' (r ₄ , θ ₄ )

On the polar coordinates, the roll apex A ',
The roll alignment is obtained by a calculation method having a function of moving the reference line, such as the least-squares method, for the error amount between B ′, C ′, and D ′ and the arc of the reference gauge.

[0024]

According to the roll alignment measuring method of the present invention, the detection end is inserted between the rolls, and the distance between the detection end and the roll surface is measured without contacting the roll surface. Therefore, the measurement operator can perform the measurement without getting in between the rolls. For this reason, it is possible to measure even a roll at a position that could not be measured conventionally, and the measuring operation is easy and safe.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a measuring device used in a roll alignment measuring method of the present invention.

FIG. 2 is a diagram illustrating a method for measuring roll alignment of a continuous casting machine according to the method of the present invention.

FIG. 3 is a diagram illustrating a method of obtaining roll alignment from a rotation angle of a detection end and a distance to a roll surface.

FIG. 4 is a flowchart showing an example of a roll alignment measurement procedure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Continuous casting machine 2 Mold 5 Roll row 6 Roll 9 Reference line 11 Roll alignment measuring device 12 Measuring device body 13 Detecting end 15 Laser oscillator 17 Laser light 18 Measuring computer

Claims (1)

[Claims] 1. A method of measuring roll alignment of a roll row in which a plurality of rolls are arranged along a predetermined reference line such that roll axes are parallel to each other, and a detection end of a laser or an ultrasonic distance measuring device is set to a predetermined end. The position is set, the detection end is rotated about an axis parallel to the roll axis, or inside the detection end is rotated about an axis parallel to the roll axis to determine the distance from the detection end to each roll surface. Measure
A roll alignment measuring method characterized in that the shortest distance from the detection end to each roll surface is calculated based on the rotation angle of the detection end and the measurement distance from the detection end, and the position of each roll with respect to the reference line is calculated. .