JPH01191027A - Shape tension detecting device - Google Patents

Abstract

PURPOSE:To accurately measure tension with fast response simultaneously with shape detection by adding a few pressure sensing elements to a tension detection type shape detecting machine and setting the sensitivity of the elements so that only a pressing force within a sensitive angle range is sensed. CONSTITUTION:The piezoelectric elements 7a-17r are installed additionally at intervals of 120 deg. of the circumferences of all disks 1-6 for tension measurement, elements which are installed at the same angles are connected in parallel, and their angle element signals are added to other angle element signals by an additional charge amplifier 8 to output a voltage signal. This addition output is led out of a detection roll through an additional rotary transmitter 19 and the height of an insensitive period level is subtracted from the height of depression pulses by a computer part to obtain a depression force arithmetic value, from which the tension T of a plate material is calculated as the speed per turn of the detection roll and displayed on a tension value display device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for online measuring the shape and tension of a rolled plate material.

[Prior Art] (1) Tension Measuring Device During rolling operation, the tension of the rolled material has a large effect on the finished rolled dimensions. In addition, in the case of multi-stand rolling, it is necessary to measure and control the tension between the stands by some means to ensure harmonious operation of each stand.

Fig. 4 is an example of a 10-type tension measuring device using a load cell, where 51 is a plate material whose tension is to be measured, 52 is a guide roll on the entry side, 53 is a guide roll on the exit side, and 54 is a tension measuring device. The meter roll 55 is a load cell.

When the plate material 51 is pulled with a tension T, the tension meter roll 54 receives an upward force F, and the force F is measured by the load cell 55 to calculate the tension T from the following equation (1).

F=27"sin α --(1)(2)
Shape Detection Device By the way, since the present invention adds a tension measurement function to a specific shape detector, the shape detector which is the basis of the shape detector will be explained.

There are online shape detectors for rolled plate materials, such as those shown in "Theory and Practice of Plate Rolling" (Iron and Steel Institute of Japan), pp. 265-270. "Structure for measuring strain force distribution across the width direction of flexible plate material" disclosed in Publication No. 54-68283
Figures 5 to 7 show a shape detector based on the concept of The mounting is a schematic diagram showing the angular relationship, and 1 to 6 are piezoelectric elements 8a to 8f that sense the pressing force at one point on the circumferential outer surface corresponding to the position of the black dot in the figure.
are thin first to sixth disks installed directly under the exceptional surface, and 7 is a large number of disks such as 1 to 6 stacked coaxially and fixed to each other to form a long cylinder in the axial direction. Detection rolls 8a to 8f are first to sixth piezoelectric elements attached to the first to sixth disks 1 to 6, one each, and 9a converts the charge signals of the piezoelectric elements 8a to 8f into voltages. The first to convert into a signal
The charge amplifier 1o is a plate material to which a predetermined tension is applied and the plate material runs while contacting the detection roll 7 and whose surface flatness is inspected.

Each disk 1 to 6 has a piezoelectric element 8 as shown in FIG. 5(b).
The mountings of a to 8f are stacked on top of each other with angles shifted by 40', and are assembled so that there are no piezoelectric elements in a total of three locations every 120".

When the plate material 1o runs in contact with the detection roll 7, the detection roll 7 rotates and the piezoelectric element 8
The configuration is such that a pulse signal having a magnitude proportional to the pressing force of the plate material 1o is output at the moment when a to 8f oppose the plate material 10.

The pressing force signal detected by each piezoelectric element 8a to 8f is obtained by summing up the signals of six discs 1 to 6 having different phases, converting it into a voltage in the first charge amplifier 9a, and adding the sum of 1 to 6. Output as point analog signal.

Figure 6 shows an example of the analog signal output. Six pulses are output per one rotation of the detection roll 7, and if detected in synchronization with the rotation angle of the detection roll 7, the pulses will be emitted from any of the discs 1 to 6. It is possible to detect whether something has been Also, during one rotation of the detection roll 7, the time during which no pulse is generated (41120.240,360" in Fig. 6)
), which indicates the zero point output of the piezoelectric elements 8a to 8f, so that the drift of the measurement system is eliminated by the measurement method indicated by the arrow 11 in the figure.

FIG. 7 is a block diagram of the same shape detector.

9b to 9c are second to third charge amplifiers, 128 to 1
2c is a first to third rotary transmitter, 14 is a calculator, 15 is a detection roll rotation angle detector, and 16 is a shape display device. The detection roll 7 is shown with its circumferential surface cut into a plane.

The pressing force signal converted into the voltage is taken out from the detection roll 7 by the first rotary transmitter 12a, and the calculator 14 detects the magnitude of the pulse from each disc 1 to 6 using a roll rotation angle detector. 15 signals and read the disc 1 at each position in the width direction of the plate 10.
Board flatness information such as unevenness is calculated from the pressing force applied to .about.6 and displayed on the shape display device 16.

[Problems to be Solved] However, conventional tension measuring instruments have the following problems.

(1) The tension measuring instrument shown in FIG. 4 cannot avoid the influence of drift, and its measurement accuracy is poor.

(2) In some cases, the shape signals of tension detection type shape detectors such as the shape detectors shown in Figures 5 to 7 are totaled and converted into tension, but the value obtained is obtained as the average of one rotation of the detection roll. Therefore, it is not possible to measure the tension at a certain moment. Therefore, it is necessary to provide another device as a tension detector.

The present invention is intended to solve the above-mentioned problems, and aims to provide a shape detector that outputs tension signals with good accuracy and responsiveness.

[Means for Solving the Problems] The shape tension detection device of the present invention provides a predetermined sensing force on the outer periphery of the unit disk, which is additionally arranged at a plurality of outer periphery angle positions where pressure sensitive elements are not arranged on the unit disk. the detection roll; addition output means for adding and outputting the outputs of a plurality of additional pressure sensitive elements whose predetermined dead angle falls within the dead angle range; The present invention is characterized in that a calculator section is provided that calculates the pressing force of the plate material against the detection roll by subtracting the output value during the dead angle period.

[Function] A major problem with instrument measurement on production lines is temperature drift over a short period of time, and performance changes due to wear and tear over a long period of time. Even in tension measurement, temperature drift occurs due to heat transfer to the load cell, etc., reducing measurement accuracy.

On the other hand, a tension detection type shape detector has a somewhat complicated structure, but is characterized by having means for eliminating drift.

The present invention attempts to add a tension measurement function to a tension detection type shape detector by adding some pressure sensing elements. A pressure-sensitive element is additionally placed at the plate angle position across the entire width of the detection roll.

Adding the additionally produced henchmen independently of the shape detection part and so as to have a zero signal period during one rotation of the detection roll in which there is no pressure sensitive output from any element, and then outputting a signal to the outside of the detection roll, The magnitude of the zero signal period is subtracted from the magnitude of the element pressure sensitive pulse of the output signal to eliminate drift, and the tension signal is calculated multiple times during one rotation of the detection roll and output to the display device. .

[Example code] Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

Note that the reference numerals mentioned above indicate the same parts, and the explanation will be omitted.

FIG. 1(a) is a perspective view of a detection roll of a shape tension detection device as an example, and FIG. 1(b) is a schematic diagram showing the angular relationship of attachment of additional piezoelectric elements on a disk. 17a-17
18 is a plurality of additional piezoelectric elements 17a to 17;
This is an additional charge amplifier that serves as an addition output means that converts r charge signals into voltage signals while adding them.

FIG. 2 is a block diagram of the shape tension detection device of the same embodiment, where 19 is an additional rotary transmitter that derives the signal generated in the detection roll 7 to the outside, and 20 calculates the tension measurement value with drift eliminated. The output computer section 21 is a tension value display device that displays tension measurement values. Note that in this embodiment, the number of disks is not limited to six, 1 to 6, and the number of additional piezoelectric elements is not limited to 18, 17a to 17r. A sufficient number of detectors shall be installed according to the specifications of the detector.

The shape tension detection device of this embodiment is configured as described above and operates as follows.

The shape detection section and tension measurement section of this device operate independently, and the operation of the shape detection section is exactly the same as the conventional one. The additionally installed piezoelectric elements and the like are also designed not to affect the shape detection section.

For tension measurement, piezoelectric elements 17a to 17r are added to every 120° of the circumference of all discs 1 to 6, and the elements installed at the same angle are connected in parallel and connected to other angle elements by an additional charge amplifier 18. It is added to the signal and output as a voltage signal. An example of this addition output is shown in FIG. 3. Three pressing force pulses 21a to 21c located at 120,240,360" and 60,180,2" during one rotation of the detection roll 7 are shown in FIG.
A dead period level 22 located at 70° is recognized, and three pressing force signals are output for each rotation.

This addition output is led to the outside of the detection roll 7 via the additional rotary transmitter 19, and in the computer section 20,
The height of the dead period level 22 is subtracted from the height of the pressing force pulse (any of 21a to 21c) to obtain the calculated pressing force value, and using the calculated pressing force value as F, the above formula (1) is applied. Through this calculation, the tension T of the plate material 10 is calculated at a plurality of speeds per rotation of the detection roll, and is supplied to the rolling mill control system as necessary and displayed on the tension value display 21 at the same time.

In this way, the shape tension detection device of this embodiment can obtain a tension signal of multiple pulses per rotation of the detection roll,
The response speed can be improved, and the drift of the piezoelectric element can be eliminated to obtain a highly accurate tension measurement signal.

In this example, a piezoelectric element is used as the pressing force sensor for shape detection and tension detection, but the same function can be achieved even if other sensors capable of detecting force, such as a load cell, are used. can be achieved.

[Effects of the Invention] The shape tension detecting device of the present invention is capable of detecting pressure within a predetermined sensitive angle range on the outer periphery of a unit disk, which is additionally arranged at a plurality of angular positions on the outer periphery where pressure sensitive elements are not arranged on the unit disk. a plurality of additional pressure-sensitive elements that are sensitive to a pressing force of the disc and are insensitive to a pressing force of a dead angle range other than the sensitive angle range on the outer periphery of the disk; and a predetermined dead angle of the detection roll. an addition output means for adding and outputting the outputs of a plurality of additional pressure-sensitive elements whose insensitivity angle range is within the insensitivity angle range; Since a computer section is provided that calculates the pressing force of the plate material against the detection roll by subtracting the output value, the shape detector can detect the shape and simultaneously measure the tension with a fast response and high accuracy. High-precision rolling control can be performed without installing a tension measuring device, and significant economic benefits such as quality improvement and investment savings can be obtained.

[Brief explanation of the drawing]

FIG. 1(a) is a perspective view of a detection roll of a shape tension detection device according to one embodiment, and FIG. 1(b) is a schematic diagram showing the angular relationship of mounting of an additional piezoelectric element in the shape tension detection device of the same embodiment. Figure, 2nd
The figure is a block diagram of the shape tension detection device of the same embodiment, FIG. 3 is a graph showing the tension signal addition output waveform of the device of the embodiment, FIG. 4 is a schematic side sectional view of a conventional tension measuring device, and FIG. figure(
a) is a perspective view of the detection roll of the conventional shape detector, FIG. 5(b) is a schematic diagram showing the angular relationship of the mounting of the piezoelectric element in the conventional shape detector, and FIG. 6 is the conventional shape detector. FIG. 7 is a block diagram of the conventional shape detector. 1 to 6... 1st to 6th discs, 7...
Detection roll, 10... Plate material, 15...
Detection roll rotation angle detector, 17a to 17r...
・Additional piezoelectric element as an additional pressure-sensitive element, 18...
・Additional charge amplifier as addition output means, 19...
...Additional rotary transmitter, 2o...
- Computer section, 21...Tension value display device. Patent Applicant Kobe Steel Co., Ltd. Representative Patent Attorney Fu Kobayashi Figure 3 Time (detection roll f) rotation angle display) - Figure 4

Claims (1)

[Claims] (1) Tension is applied to the circumferential surface of the detection roll by the output of the pressure-sensitive element of a cylindrical detection roll formed by stacking and fixing a plurality of disks each having one or more pressure-sensitive elements arranged on the outer periphery. In a shape detection device that detects the surface unevenness of a plate material that is in contact with and travels while being applied, a predetermined outer circumference of the disk is additionally arranged at a plurality of outer circumferential angle positions where the pressure sensitive element is not arranged on the disk. a plurality of additional pressure-sensitive elements that are sensitive to a pressing force within the sensitive angular range of the disc and are insensitive to a pressing force that is in an insensitive angular range other than the sensitive angular range on the outer periphery of the disk; an addition output means for adding and outputting the outputs of a plurality of additional pressure sensitive elements whose predetermined dead angle of the detection roll falls within the dead angle range; and an output signal of the addition output means during the sensitive angle range period. and a calculator section that calculates the pressing force of the plate material against the detection roll by subtracting the output value of the dead angle period from the value.