JPH03295404A - Contact type shape detector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a shape detector for detecting the shape of a metal plate such as a steel plate, and in particular a contact type detector for detecting the shape of a plate using a load cell. It is related to shape detectors.

[Prior art] For example, in cold rolling, even if you try to measure the shape of a strip online and in real time, the rolling surface is always under tension in the longitudinal direction of the strip, so the waves in the strip will disappear. , it has a latent shape, and it is not possible to measure the shape when the tension is removed. Therefore, shape detection has conventionally been carried out by simply measuring the tension distribution in the width direction of the plate.

The configuration of the shape detector is one that detects the radial force of the plate tension applied to each rotor with a large number of built-in load cells in the plate width direction, or as described in Japanese Patent Application Laid-Open No. 1-69902,
A plurality of diaphragms are provided in the width direction of the diaphragm in the shell portion, which is a roll outer cylinder that comes into contact with a thin metal plate, and the strain occurring in the diaphragm is measured.

Shape detectors incorporating load cells are either split or integrated, but they are all made of iron or coated with a composite ceramic on the surface.

Hard chrome plating) is applied.

FIG. 4 is a sectional view showing the main parts of a conventional contact type shape detector.

A load cell 2 including a strain gauge is embedded in a cylindrical roll shell 1. Furthermore, a diaphragm coated with iron or hard chrome is disposed between the rows 1 to 2 and the strip 3.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, since the tire flam is made of a highly rigid material, impact force is applied to the tire plum due to the impact caused by the plate breakage, and the diaphragm is damaged. could be damaged.

In addition, in cold rolling, the strip 3 vibrates, and the strain gauge detects the load of the strip 3 hitting the row 1-cell 2 due to the vibration, and there is a problem in that the strain gauge outputs an abnormal value.

This problem will be explained with reference to FIGS. 5 to 8.

As shown in FIG. 5, a signal level 52 after processing the intensity S is obtained for the detected normal main waveform 51. The impact load due to plate vibration is detected as shown in FIG. 6, and a processed signal level 62 is obtained for the detected main waveform 61.

In FIG. 6, it is determined that the signal l novel due to tension is originally S, or if there is an impact load due to vibration of the plate, it is at the level S', and this becomes an abnormal value.

FIG. 7 shows an example of the tension distribution, and FIG. 8 shows how the steepness was calculated based on this. In this case, the correct steepness distribution should be as shown by the dotted line, or if there is an impact load, the accuracy will deteriorate significantly as shown by the solid line.

Depending on the type of shape detector, the weight ranges from several hundred kilograms to several thousand kilograms.
Due to the frictional torque of the bearing and the inertial force it has, slippage occurred between the plate and the shape detector during acceleration and deceleration of the process, causing scratches on the plate.

When introducing a shape detector like the one described above into such a process, a helper drive device (a device that forcibly synchronizes the speed of the plate and the circumferential speed of the shape detector) is required, which requires a huge amount of capital investment and power. Requires expenses. Furthermore, if a problem occurs with the helper drive device, there is a risk that the strip will be damaged and a large number of defective products will be produced.

An object of the present invention is to provide a contact type shape detector that is not easily affected by vibrations of the strip and does not damage the strip.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a contact type shape detector that measures the shape of a plate-shaped body using a load cell embedded in the cylindrical body. The surface is lined with an elastic material.

As the elastic body, a hard urethane rubber having excellent wear resistance and tear resistance can be used.

[Operation] According to the above-described means, the elastic body applied to the surface of the cylindrical body absorbs vibration components from the plate-shaped body so as to disperse them inside the elastic body, and prevents the vibration components from being transmitted to the load cell. Acts to relieve.

Furthermore, the elastic body does not cause any flaws on the surface of the plate-like body that comes into contact with it. Therefore, it is possible to eliminate the influence of vibration of the plate-shaped body on shape detection, and it is also possible to prevent scratches on the plate-shaped body.

In addition, by using hard urethane rubber as the elastic body,
Abrasion resistance and tear resistance can be ensured. Therefore, the running cost associated with shape detection can be reduced.

[Embodiment] FIG. 1 is a perspective view showing an embodiment of a contact type shape detector according to the present invention.

Roll 4 made of hollow cylindrical metal (e.g. iron)
The (cylindrical body) is rotatably supported, a plurality of load cells 5 are attached to its inner peripheral surface, and a rotary connector 6 is provided at one end.

An internal wiring 7 is connected to the load cell 5, and the end thereof is connected to a rotary connector 6.

An external wiring 8 for connecting to an external signal processing device is connected to the rotary connector 6.

A coating material 9 is applied to the inner peripheral surface of the roll 4 so that the internal wiring 7 adheres to the inner wall surface of the roll, and a hard urethane material is applied to the outer peripheral surface of the roll 4 as an elastic material with excellent wear resistance and tear resistance. It is lined with rubber 10.

If this hard urethane rubber lO is too thin, strip 3
easily torn apart in a short period of time. Note that the hardness of the hard urethane rubber 10 is Hs to improve wear resistance.
= about 75 to 90 is required.

By providing the hard urethane rubber 10 in this way,
The impact force caused by the plate breakage is dispersed within the elastic body, and no local concentrated force is applied to the load cell 5.

Further, even if the strip 3 vibrates, the impact force due to the vibration is absorbed inside the thick elastic body, and the vibration component transmitted to the load cell 5 is alleviated.

Therefore, measurement accuracy can be improved compared to the conventional hard chrome plating.

However, in the process of rolling the surface of strip 3 or a thin plate of stainless steel or titanium to a mirror finish, even the slightest flaw is not allowed. Therefore, all the rolls installed on the line except the rolling rolls are generally lined with a material such as hard urethane rubber that will not damage the strip 3 even if it slips.

On the other hand, with contact type shape detectors, if the surface is covered with a lining material such as urethane rubber, the force transmitted from the strip will be absorbed by the lining material, making it difficult to obtain a sufficient strain gauge output. was.

On the other hand, the present inventor discovered that urethane rubber having a certain thickness absorbs vibration components and can obtain sufficient detection power, and has developed a contact type shape detector having the above-mentioned configuration. This is what led to his invention.

Next, the effect of applying the hard urethane rubber 10 will be verified with reference to FIGS. 2 and 3.

Here, a roll 4 made of iron is lined with hard urethane rubber 10 as described above, and the force F applied to the surface of this hard urethane rubber 10 is calculated from the hard urethane rubber lO.
It was measured how the force was transmitted to the load cell 5 via the force and the level of force absorbed by the hard urethane rubber 10.

In FIG. 2, 11 indicates the center of the load cell 5, and 1
2 indicates an amplifier connected to the load cell 5.

Moreover, FIG. 3 shows the strain output (output of the amplifier 12) characteristics with respect to the distance from the center of the load cell to the load point (however, the thickness t of the hard urethane rubber 10 is 15 mm,
When hardness Hs=80).

Curve a in FIG. 3 is the output characteristic when the roll 4 and the hard urethane rubber 10 are not bonded, and curve A is the output characteristic when the roll 4 and the hard urethane rubber 10 are bonded. Here, the difference between curve a and curve A is 10% of hard urethane rubber.
It represents the power absorbed inside.

According to the experiments conducted by the inventors, the force applied to the surface of the hard urethane rubber lO is approximately equal to the thickness t of the hard urethane rubber lO.
It was confirmed that the particles were dispersed in a conical shape with a radius of .

Therefore, hard urethane rubber lO of hardness Hs=75 to 90
If the load cell 5 is lined with a thickness of lO~20cm, the load cell 5 will detect the force applied from the strip 3 within a radius of 7 mm from its center, so the output of the load cell 5 will be from the center. The average value of the radius tmm is a value slightly smaller than the true value. Therefore, in this embodiment, the output of the load cell 5 is multiplied by a correction coefficient to convert it into a true tension value.

Note that the level of force absorbed inside the hard urethane rubber 10 is affected by the material, hardness, thickness, and diameter of the hard urethane rubber 10, so the correction coefficient must be determined according to the hard urethane rubber 10. Must be.

[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

In the contact type shape detector according to claim (1), in the contact type shape detector that measures the shape of the plate-like body using a load cell embedded in the cylindrical body, the surface of the cylindrical body is made of an elastic material. Since the lining is made by lining, it is possible to eliminate the influence of vibration of the plate-shaped body on shape detection, and also to prevent scratches on the plate-shaped body.

In the contact type shape detector according to claim (2), by using hard urethane rubber as the elastic body, wear resistance and tear resistance can be ensured, and running costs associated with shape detection can be reduced. be able to.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the contact type shape detector according to the present invention, FIG. 2 is an explanatory diagram of a force dispersion experiment applied to the surface of an elastic body, and FIG. Distortion output characteristic diagram, Figure 4 is a sectional view showing the main parts of a conventional contact type shape detector, Figure 5 is a diagram of normal shape detection waveforms and signal waveforms after processing, and Figure 6 is vibration of a plate-shaped object. Fig. 7 is a distribution characteristic diagram showing the tension distribution, and Fig. 8 is a characteristic diagram showing the relationship between row 1 cell position and steepness in the board width direction. be. In the figure. 4: Roll 5: Roth cell 6, rotary connector 7: Internal wiring 8: External wiring 9: Coach ink material 1O: Hard urethane rubber

Claims (2)

[Claims] (1) A contact type shape detector that measures the shape of a plate-shaped body using a load cell embedded in a cylindrical body, characterized in that the surface of the cylindrical body is lined with an elastic material. . (2) The contact type shape detector according to claim 1, wherein the elastic body is made of hard urethane rubber.