JPH1048077A - Calibrating apparatus of shape detector for strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure by applying the load of plural standard weights, to a loads detector, by a lever which is moved rectangulalty to a bar in a core length direction of a detecting roll and forms a lever by using the standard weights, the perform the calibration. SOLUTION: A bar 2 is put over a core length direction of a shape detecting roll, a roll presser 3 to be placed on a split roll 21, is mounted on a lever 4 which is perpendicular to the bar 2, and is moves while guided by the bar 2, and further a weight loading part 5 for supporting a standard weight 6, is installed on an edge part of the lever 4. The roll presser 3 is installed on a position at a specific distance from the bar 2 as a fulcrum. The load by the weight 4 is applied to the split roll 21 by a ratio of 1 : lever raio. By setting not less than three weights 6, the adjustment of a zero point of a load detector included in the split roll 21, and that of the linearity can be made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shape detection method for measuring the shape of a continuous strip by measuring the tension distribution in the width direction of the strip continuously using a load detector such as a strain gauge or a piezoelectric element. The present invention relates to a device for calibrating a load detector of a device.

[0002]

2. Description of the Related Art As a technique for measuring the shape of a continuously running strip on-line, a tension distribution in a strip width direction generated in response to a longitudinal extension of the strip when tension is applied to the strip is continuously measured. It is common to measure and measure the strip width direction tension distribution based on the measured strip width direction tension distribution.

Techniques for measuring the tension distribution in the strip width direction include a technique in which a load detector is incorporated into a plurality of divided rolls arranged in the strip width direction, a vibration frequency in the strip width direction by applying a forced vibration to the strip from the outside, and the like. Techniques have been proposed for measuring the displacement distribution, and for measuring the lattice spacing using X-ray diffraction, utilizing the fact that the lattice spacing changes due to internal stress.

Various technologies have been put into practical use since the principle was proposed in Japanese Patent Application Laid-Open No. 49-12066, in which a load detector comprising a piezoelectric manipulator or a strain gauge or the like was incorporated in an axial split roll. It has been. For example, FIG.
As shown in the figure, a common idea is that a split roll 21 having a built-in load detecting mechanism for detecting a vertical component of tension is externally fitted to the fixed shaft 17 and arranged in the strip width direction, and these are integrated. Is used as the shape measurement roll 8 to measure the tension distribution in the strip width direction. The difference in the structure of such a system is the difference in the structure of the rotating split roll, and typical known examples thereof are shown in FIGS.

FIG. 6 shows that four load cells 14 for load detection are incorporated at every 90 degrees into a steel core 30 integrated with a sleeve 22 on the outer periphery of a split roll 21, and the four load cells 14 are rotated as the steel core 30 rotates. Is an example of sequentially detecting the load. In this case, the load detection signal from each load cell 14 is output to the outside via the slip ring 29 attached to the fixed shaft 17. The load detection signal is not continuous, but is taken out as a discontinuous signal every quarter rotation of the steel core 30.

FIG. 7 shows a split roll 2 having the same structure as that of FIG.
1 is an example in which a piezoelectric element 31 for load detection is incorporated on the surface of a steel core. The extraction of the load signal from the piezoelectric element 31 is the same as in FIG. 5, but in this case, the signal is extracted once per rotation of the sleeve 22. Conventionally, as a calibrating device for maintaining the accuracy of these split roll type shape detectors, as shown in FIG. 8, a reference load that passes over the bar 2 in the body length direction of the shape detection roll 8 and moves on the bar 2 is used. A method of applying a load to a load detector in each of the divided rolls 21 using a pressure reduction device (calibration device) 41 incorporating a detector is often adopted. Roll-down device 41
FIG. 9 shows an example of the structure of FIG. 9. An electric servomotor 44 is provided in a frame which is fitted on the bar 2 and moves in the direction of arrow 43, and a reference load detector 42 such as a load cell is provided via the servomotor 44. The load is pressed down on the split roll 21 as indicated by arrows 45 and 46, and the zero point and the span of the load converter are adjusted so that the output from the reference load detector 42 and the load detector provided in the split roll 21 match. To adjust.

[0007]

The conventional apparatus has the following problems. (1) Calibration is performed by a combination of an electric servomotor, a reference load detector, and the like, and the structure is complicated and expensive. (2) It is also necessary to periodically calibrate the reference load detector itself. In such a case, it is necessary to remove the load detector from the calibration device and compare the output with a weighing instrument that is a national standard.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus for calibrating a strip shape detector which solves the above problems.

[0009]

In order to solve the above-mentioned problems, according to the present invention, a bar is passed in the body length direction of a shape detection roll of a split roll type shape detector, and a lever which is orthogonal to the bar and moves on the bar is provided. The lever is used to form a lever using a plurality of reference weights.
Calibration is performed by applying a load of at least three or more reference weights to a load detector such as a piezoelectric element or a strain gauge.

That is, according to the present invention, there is provided an apparatus for calibrating a strip shape detector in which a load detector is incorporated in an axial split roll, wherein a bar parallel to the roll axis is provided, and a lever orthogonal to the bar is provided. This lever has a hole through which the bar is inserted as a first fulcrum, and a pressing roll arranged so as to be in contact with the split roll as a second fulcrum, and a reference weight loading for applying three or more reference weights. A calibration device for a strip shape detector, wherein a lever having a free end formed as a part is formed.

When the distance between the pressing roll and the weight loading portion, that is, the magnification of the lever is several times larger than the distance between the hole of the lever and the pressing roll, The measurement accuracy can be improved by this principle. The operation of the present invention is as follows. (A) Since the calibration device has a simple structure using a lever to which a roller is applied and a plurality of reference weights, troubles such as failures do not occur and the cost is low. (B) With regard to the reference weight, it can be managed only by periodically measuring the weight with a weighing instrument that is a national standard. Therefore,
This eliminates the need for complicated work such as removal and attachment of the load detector from the calibration device as in the related art. (C) A calibration curve can be easily obtained by setting three or more reference weights.

[0012]

1 and 2 show the structure of a calibration apparatus according to the present invention, and FIG. 3 shows how the apparatus is incorporated in a shape detector. FIG. 4 is an explanatory diagram of a specific calibration method using this calibration device. FIG. 1 shows a side view structure of the calibration device 1, and FIG. 2 shows a plan view thereof. FIG. 3 is an overall perspective view.

The calibrating apparatus according to the present invention transfers the bar 2 in the body length direction of the shape detecting roll 8, and the roll 4 mounted on the split roll 21 is moved to the lever 4 which is orthogonal to the bar 2 and is guided and moved by the bar 2. The presser 2 is attached, and a loading portion 5 for locking a standard weight 6 is provided at an end of the lever 4. With the bar 1 passed in the width direction of the shape detection roll 8 as a fulcrum, the roll presser 2 is installed at a position at a distance L from the fulcrum. Weight 4
Is applied to the split roll 21 at a ratio of 1: m (m is a lever ratio). N weights 4 (n is an integer of 3 or more)
By setting, the adjustment of the zero point and the linearity of the load detector incorporated in the split roll 21 can be performed. Furthermore, the roll holder 2 has a rotatable roller structure, and a load test can be performed while rotating the divided rolls 21, so that the state of load detection in a loaded state can be confirmed.

As shown in FIG. 3, the calibration device 1 includes a bar 2
Can be moved in the body length direction of the shape measuring roll 8 with the fulcrum as a fulcrum. In this embodiment, the structure is configured to be moved manually. It is good also as a structure to move. In addition, if the reference weight 6 is simply structured to hang on the calibration lever 4, the handling is easy. The calibrating device 1 may be retracted to the position of the bearing 23 when not in use, and the bar 2 may be detachable so that the calibrating device 1 is used only during calibration. .

FIG. 4 is an explanatory diagram of a specific method for calibrating a shape detector using an embodiment of the present invention. First, the calibration device 1 is moved to a position immediately above the division roll 21 to be calibrated. Next, the n reference weights 6 are applied one by one to the loading portion of the calibration lever, and the output from the signal processor of the load detector incorporated in the split roll 21 is output to the signal processor 5.
Record in 1. The weight reference value based on the reference weight 6 is xi (i
= 1 to n), and the output from the signal processing device at that time is yi
A linear function x = ay + b that most appropriately expresses the relationship between the two is calculated using the least squares method (i = 1 to n), and a calibration calibration curve 52 is created. In the above equation, a is set as a span compensation value and b is set as a zero point compensation value, thereby enabling signal correction in the signal processing device. This is repeated for all divided rolls 21. Originally, a = 1.0 and b = 0 should be set. However, when a change in the characteristics of the load detector occurs, these a, b
By correcting the value of, accurate load detection is always possible.

[0016]

The present invention has the following effects. (1) Since the calibration device has a simple structure using a lever to which a roller is applied and a plurality of reference weights, troubles such as failures do not occur and the cost is low. (2) The lever ratio (1:
According to m), it is only necessary to prepare a weight of 1 / m of the load required for calibration, so that the calibration work is easy. (3) Regarding the reference weight, it can be managed only by periodically measuring the weight with a weighing instrument that is a national standard. Therefore,
This eliminates the need for complicated work such as removal and attachment of the load detector from the calibration device as in the related art.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a calibration device for a shape detector according to an embodiment.

FIG. 2 is a plan view of a calibration device of the shape detector according to the embodiment.

FIG. 3 is a perspective view of the embodiment.

FIG. 4 is a block diagram of an embodiment.

FIG. 5 is an explanatory diagram of a conventional shape detection device.

FIG. 6 is an explanatory diagram of a conventional shape detection device.

FIG. 7 is an explanatory diagram of a conventional shape detection device.

FIG. 8 is a perspective view of a conventional shape detection device.

FIG. 9 is a cross-sectional view showing a structural example of a conventional shape detection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Calibration device 2 Bar 3 Roll holder 4 Lever 5 Weight loading part 6 Weight 8 Shape measurement roll (shape detection roll) 10 Strip 14 Load cell 17 Fixed shaft 21 Split roll 22 Sleeve 23 Bearing 29 Slip ring 30 Steel core 31 Piezoelectric element 41 Calibration Device (roll-down device) 42 Reference load detector 43, 45, 46 Arrow 44 Servo motor 51 Signal processing device 52 Calibration calibration curve

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shunji Harada 3-48 Takahata-cho, Nishinomiya-shi, Hyogo Prefecture Kawatetsu Advan-Tech Co., Ltd. (72) Inventor Masahiro Hamamatsu 3-48 Takahata-cho, Nishinomiya-shi, Hyogo Kawatetsu Advan-Tech Corporation Inside

Claims (2)

[Claims] 1. A device for calibrating a strip shape detector in which a load detector is incorporated in an axial split roll, wherein a bar parallel to the roll axis is provided, and a lever orthogonal to the bar is provided. The hole through which the bar is inserted is used as a first fulcrum, and the presser roll arranged so as to be in contact with the split roll is used as a second fulcrum, and the reference weight loading portion for applying three or more reference weights is free. An apparatus for calibrating a strip shape detector, wherein a lever as an end is formed. 2. The strip shape detection according to claim 1, wherein a distance between said holding roll and said weight loading portion is several times larger than a distance between said hole of said lever and said holding roll. Calibration equipment.