JP3386663B2 - Calibration device for strip shape detector - Google Patents

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 strip by online measuring the tension distribution in the width direction of a continuous strip 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 the device.

[0002]

2. Description of the Related Art A technique for continuously measuring the shape of a continuously running strip is to continuously measure the tension distribution in the width direction of the strip corresponding to the elongation in the longitudinal direction of the strip when tension is applied to the strip. It is common to measure and measure the tension distribution in the strip width direction as the shape distribution in the strip width direction.

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

A technique for incorporating a load detector composed of a piezoelectric element or a strain gauge into each axially divided roll is as follows.
Since the principle was proposed in Japanese Patent Laid-Open No. 49-120665 , various kinds have been put into practical use. For example, as shown in FIG. 5, the common idea is that the split rolls 21 each having a built-in load detection mechanism for detecting the vertical component of tension are externally fitted to the fixed shaft 17 and arranged in the strip width direction, and these are integrated. This is to measure the tension distribution in the width direction of the strip as the shape measuring roll 8. The difference in the structure of such a system is the difference in the structure of the rotating split rolls, and typical known examples thereof are shown in FIGS. 6 to 7.

In FIG. 6, four load cells 14 for load detection are incorporated into the steel core 30 integrated with the sleeve 22 on the outer periphery of the split roll 21 at every 90 degrees, and as the steel core 30 rotates, four load cells 14 are loaded. 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 mounted on the fixed shaft 17. The load detection signal is not continuous, but the steel core 30 is taken out as a discontinuous signal every quarter rotation.

FIG. 7 shows a split roll 2 having a structure similar to that of FIG.
1 is an example in which the piezoelectric element 31 for load detection is incorporated on the surface of the steel core. The load signal is extracted from the piezoelectric element 31 in the same manner as in FIG. 5, but in this case, the signal is extracted once per rotation of the sleeve 22. As a calibration device for maintaining the accuracy of these split roll type shape detectors, conventionally, as shown in FIG. 8, a bar 2 is passed in the body length direction of the shape detecting roll 8 and a reference load for moving on the bar 2 is used. A method of applying a load to the load detector in each divided roll 21 using a pressure reducing device (calibration device) 41 incorporating a detector is often adopted. Reduction device 41
9 shows an example of the structure of FIG. 9, an electric servomotor 44 is provided in a frame which is fitted onto 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. It 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 reference load detector 42 and the output from the load detector provided in the split roll 21 match. Adjust.

[0007]

The conventional device has the following problems. (1) It is calibrated by a combination of an electric servomotor, a reference load detector, etc., and its structure is complicated and expensive. (2) It is also necessary to calibrate the reference load detector itself on a regular basis. In that case, it is necessary to remove the load detector from the calibration device and compare the output with the national standard weighing machine.

An object of the present invention is to provide a calibration device for a strip shape detector which solves the above problems.

[0009]

In order to solve the above problems, in the present invention, a bar is passed in the cylinder length direction of the shape detection roll of the split roll type shape detector, and a lever that is orthogonal to the bar and moves on the bar is provided. Provided, this lever is made to form an envelope using a plurality of reference weights, using this lever,
Calibration is performed by applying a load of at least three reference weights to a load detector such as a piezoelectric element or a strain gauge.

That is, according to the present invention, in a device for calibrating a strip shape detector having a load detector incorporated in each axially divided roll, a bar parallel to the roll axis is provided, and a lever orthogonal to this bar is provided. the lever is a supporting point hole through which the bar is inserted, the pressing roll disposed so as to contact on the divided rolls as a working point, the free end of the reference weight loading unit which applies three or more of the plurality of standard weight The apparatus for calibrating a strip shape detector is characterized in that a lever is formed.

When the distance between the pressing roll and the weight loading portion, that is, the magnification of the lever, is several times the distance between the hole of the lever and the pressing roll, This principle can improve the measurement accuracy. The operation of the present invention is as follows. (A) Since the calibration device has a simple structure using a lever and a plurality of reference weights to which the lever is applied, no trouble such as a failure occurs and the cost is low. (B) Regarding the reference weight, it is possible to manage it only by periodically measuring the weight with a weighing machine that is a national standard. Therefore,
It is not necessary to remove the load detector from the calibration device and attach the load detector to the calibration device. (C) The calibration curve can be easily obtained by using three or more reference weights.

[0012]

1 and 2 show the structure of a calibration device according to the present invention, and FIG. 3 shows how it 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 structure of the calibration device 1, and FIG. 2 shows a plan view thereof. FIG. 3 is an overall perspective view.

In the calibration device of the present invention, the bar 2 is passed in the cylinder length direction of the shape detection roll 8, and the roll 4 placed on the split roll 21 is mounted on the lever 4 which is orthogonal to the bar 2 and is guided and moved by the bar 2. The presser foot 3 is attached, and the loading portion 5 for locking the standard weight 6 is provided at the 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 retainer 3 is installed at a distance L from the fulcrum. Split roll 2 with a weight 4 weight of 1: m (m is the lever ratio)
1 is applied. By installing n number of weights 4 (n is an integer of 3 or more), it is possible to adjust the zero point and the linearity of the load detector incorporated in the split roll 21.
Furthermore, the roll retainer 2 has a rotatable roller structure,
It is possible to perform a load test while rotating the split roll 21, and it is possible to confirm how load is detected in a loaded state.

As shown in FIG. 3, the calibration device 1 includes a bar 2
It is possible to move in the cylinder length direction of the shape measuring roll 8 with the fulcrum as a fulcrum. In this embodiment, the structure is manually moved, but of course, by using a ball screw and a servomotor, it is automatically up to just above any divided roll. The structure may be such that it is moved. In addition, if the reference weight 6 is also simply hung on the calibration lever 4, it is easy to handle. The calibration 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 calibration device 1 is used only during calibration. .

FIG. 4 is an explanatory diagram of a specific method for calibrating the shape detector using the embodiment of the present invention. First, the calibrating device 1 is moved to directly above the split roll 21 to be calibrated. Next, the n reference weights 6 existing one by one are hung one by one on the loading portion of the calibration lever, and the output from the signal processing device of the load detector incorporated in the split roll 21 is output to the signal processing device 5.
Record at 1. The weight reference value by the reference weight 6 is xi (i
= 1 to n), the output from the signal processing device at that time is yi
The linear function x = ay + b that most appropriately expresses the relationship between the two is calculated by using the least squares method as (i = 1 to n), and the calibration calibration curve 52 is created. In the above equation, a can be corrected in the signal processing device by using a as a span compensation value and b as a zero compensation value. This is repeated for all the divided rolls 21. Originally, a should be 1.0 and b should be 0, but when the characteristic change of the load detector occurs, these a and b
By correcting the value of, it is possible to detect the load accurately at all times.

[0016]

The present invention has the following effects. (1) Since it is a calibration device having a simple structure that uses a lever and a plurality of reference weights, it is inexpensive and inexpensive. (2) Lever ratio (1:
According to m), it is only necessary to prepare a weight of 1 / m of the load required for calibration, so the calibration work is easy. (3) Regarding the reference weight, it is possible to manage it only by periodically measuring the weight with a weighing machine that is a national standard. Therefore,
It is not necessary to remove the load detector from the calibration device and attach the load detector to the calibration device.

[Brief description of drawings]

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

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

FIG. 3 is a perspective view of an example.

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]

1 Calibration device 2 bars 3 roll holder 4 levers 5 weight loading section 6 weights 8 Shape measuring roll (shape detecting roll) 10 strips 14 load cell 17 fixed axis 21 split rolls 22 Sleeve 23 Bearing 29 slip rings 30 steel core 31 Piezoelectric element 41 Calibration device (roll-down device) 42 Reference load detector 43, 45, 46 arrows 44 Servo motor 51 Signal processing device 52 Calibration calibration curve

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masahiro Hamamatsu 3-48 Takahata-cho, Nishinomiya-shi, Hyogo Kawatetsu Advantech Co., Ltd. (56) Reference JP-A-8-145655 (JP, A) JP-A-50- 93456 (JP, A) JP-A-61-18836 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01L 5/04

Claims (2)

(57) [Claims] 1. A device for calibrating a strip shape detector in which load detectors are respectively incorporated in axially divided rolls, 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 and supported <br/> point, the arrangement was presser rolls so as to contact on the divided rolls as a working point, free the reference weight loading unit which applies three or more of the plurality of standard weight A device for calibrating a strip shape detector, characterized in that a lever having an end is formed. 2. The shape detection of the strip, wherein the distance between the pressing roll and the weight loading section is several times the distance between the hole of the lever and the pressing roll. Calibration equipment.