JPH03138502A - Steel plate shape detecting device - Google Patents

Abstract

PURPOSE:To prevent an oil film from being formed on the surface of an insulating material and to accurately detect the displacement of a steel plate by scattering oil drops sticking on the water-repellent surface of the insulating material with compressed air from a compressed air blowing device. CONSTITUTION:A displacement detector 4b detects the displacement of a body 1 to be measured. Then the compressed air from the compressed air blowing device 28 is sent from a top plate 29 to the surface of the insulating material 26 as shown by an arrow 30 to scatter oil drops, etc., on the water-repellent insulating material 26. Consequently, the respective oil drops 27 sticking on the insulating material 26 are scattered and thus prevented from forming the oil film 24 on the surface of the insulating material 26 by coupling one another. Therefore, an electrode 15 and the frame of a detector 4b are prevented from being short-circuited and the electrostatic capacity between the electrode 15 and the body 1 to be measured is prevented from increasing, so a normal displacement detection signal is obtained. Further, the upper plate 29 is fitted up to right before the insulating material 26, so the body 1 to be measured is prevented from colliding against the insulating material 26, which is protected against damage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a steel plate shape detection device installed in a rolling line for steel or the like to detect distortion of a steel plate.

[Prior Art] Figures 2 and 3 show a conventional steel plate shape detection device disclosed in, for example, Japanese Patent Application Laid-Open No. 59-164902, in which Figure 2 is a block diagram thereof and Figure 3 is a main part thereof. FIG. As shown in FIG. 2, a rectangular wave drive signal with a constant period 're generated by a drive signal generator 3 is applied to an object to be measured 1 to which tension is applied by a tension applying device 2 such as a deflector roll. 3a, and the external force f (t) is amplified by the external force applying device 4a housed in the detection head 4.
At the same time, the displacement P (x, t) in the width direction of the object to be measured 1 due to the application of external force is detected by the displacement detector 4b provided in plurality in the width direction, and then in the signal processing circuit 9, the displacement detected value is detected. The tension of the object to be measured 1 is calculated by calculating the correlation between the drive signal and the drive signal as described below, and the shape is detected from the tension distribution of the tension value in the width direction of the object to be measured.

That is, in FIG. 2, n: number of cycles of the rectangular wave
t<(n+1/2)・Tc○:(n+1
/2)・Tc≦t<(n 1, 1)・Tcu
(t): Tension per unit width light at z (unit tension) L: Span between rolls d: Board thickness, the output of the signal processing circuit 9 is expressed as follows.

The details of the function of the signal processing circuit 9 in FIG. 2 are as follows. That is, the displacement signal P (x, t) is input to the integrating circuit 6 after the polarity is switched by the polarity switch 5 . The integration circuit 6 integrates the displacement detection signal value based on the rectangular wave signal every rectangular wave period to remove noise other than the tension signal, and samples and holds the signal in the sample and hold circuit g7 to obtain the output signal C(x). . Reference numeral 8 denotes a sample timing generation circuit, which is connected to the drive signal generator 3 and controls various timings such as the polarity switching timing of the polarity switch 5, the reset timing of the integrating circuit 6, and the sample hold timing of the sample hold circuit 7. It is.

As shown in equation (1) above, the output C of the signal processing circuit 9
(x) is a function of the width direction tension distribution, and the width direction output C
(Xi)+C(X2)l ''+C(Xn) via a display device control circuit 10 to a display device 11 such as a CRT.
The flatness distribution can be seen by displaying the flatness distribution. Further, the output C(x) of the signal processing circuit 9 is also sent to the roll crown adjustment device 13 via the roll crown control device 12.

On the other hand, the displacement detector 4b is provided along the width direction of the object to be measured 1 and isolated at an appropriate interval on the surface of the object to be measured 1 by a predetermined locking means. The detection head 4 includes an external force applying device 4a and a displacement detector 4b.

The external force applying device 4a is composed of an electric magnet with an excitation coil B attached to a magnetic pole A having a U-shaped cross section along the width direction of the object to be measured 10, and applies a uniform attractive force to the object to be measured 1 in the width direction. That is. Further, 4C is a displacement conversion circuit such as a capacitance-voltage converter.

FIG. 3 shows a sectional view of the displacement detector 4b. In this FIG. 3, 14 is an insulating material integrally formed with the electrode 15;
1 schematically shows the capacitance between the electrode 15 and the object to be measured 1. FIG. 17 is an electric wire for extracting the output from the electrode 15; 24 is a conductive film made of rolling oil, iron powder, etc.; 26 is a water-repellent insulating material; 27 is a conductive film 24 disposed on the water-repellent insulating material 26; These are oil droplets that have become spherical. By measuring the capacitance 16 between the electrode 15 whose periphery is insulated by the insulating material 14 and the material to be measured 1, the distance between the material to be measured 1 and the electrode 15 is detected. taken out.

[Problem to be solved by the invention] By the way, rolling oil is used in rolling lines.

In a device in which the water-repellent insulating material 26 is provided only on the front surface of the displacement detector 4b or on the surface of the electrode 15 and its insulating layer 14, each oil droplet 27 has a spherical shape while the amount of attached oil is small. Since the oil droplets 27 are separated and insulated, there is no problem in capacitance measurement. However, when the amount of attached oil increases, the oil droplets 27 combine to form an oil film, which damages the electrode 15 and displacement detector 4b. A short circuit with the frame and an increase in capacitance between the electrode 15 and the material to be measured 1 occur, causing an error in the displacement detection signal of the material to be measured 1. Moreover, the object to be measured 1 collides with the water-repellent insulator 26, and the water-repellent insulator 2
6 may be damaged.

This invention was made to solve the above-mentioned problems, and it is possible to remove each oil droplet adhering to the surface of a water-repellent insulating material, protect the water-repellent insulating material, and protect the material to be measured. The object of the present invention is to obtain a steel plate shape detection device that can accurately obtain a displacement detection signal.

[Means for Solving the Problems] A steel plate shape detection device according to the present invention includes a compressed air blowing device that blows compressed air toward the insulating material surface on the surface of each displacement detector, and an upper plate that protects the insulating material. It is equipped with the following.

[Function] In the steel plate shape detection device of the present invention, compressed air from the compressed air blowing device scatters spherical oil droplets adhering to the surface of the water-repellent insulating material, and an oil film is formed on the surface of the insulating material. You can prevent it from happening.

Further, the upper plate protects the insulating material from damage caused by collision with a steel plate or the like.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that, in the drawings, the same reference numerals as those in the description indicate the same parts, so the explanation thereof will be omitted.

In FIG. 1, 28 is a compressed air blowing device that is provided at the end of the displacement detector 4b and blows compressed air toward the surface of the insulating material 26 on the surface of the displacement detector 4b, and 29 is a compressed air blowing device that blows compressed air from the compressed air blowing device 28. An upper plate 30 that guides compressed air to the surface of the insulating material 26 and protects the insulating material 26 is an arrow indicating the flow of compressed air from the compressed air blowing device 28.

Next, the operation of the apparatus of this embodiment will be explained.

The basic measurement operation is exactly the same as the conventional one, and the displacement detector 4b detects the displacement of the object 1 to be measured. Compressed air from the compressed air blowing device 28 is guided to the surface of the insulating material 26 by a two-liquid 29 as shown by an arrow 30, and this compressed air removes oil droplets, water, dirt, etc. on the water-repellent insulating material 26. is scattered. As a result, each oil droplet 27 attached on the insulating material 26
This can prevent the oil droplets 27 from scattering and from forming an oil film 24 on the surface of the insulating material 26 due to the combination of the oil droplets 27 .

Therefore, a short circuit between the electrode 15 and the frame of the displacement detector 4b and an increase in capacitance between the electrode 15 and the object to be measured can be prevented, and a normal displacement detection signal can be obtained. Also,
Since the upper plate 29 is attached up to just in front of the water-repellent insulating material 26, it prevents the object to be measured 1 from colliding with the insulating material 26, thereby protecting the insulating material from damage.

In addition, in the above embodiment, in order to scatter the oil droplets 27,
Although only compressed air was used, cleaning water may be mixed with compressed air and sprayed. Furthermore, in the above embodiment, the upper plate 29 has the function of guiding the compressed air and the function of protecting the insulating material 26, but it may also be provided with a two-component liquid only for the purpose of protecting the insulating material 26. .

[Effects of the Invention] As described above, according to the present invention, an oil film is formed on an insulating material by compressed air from a compressed air blowing device.

In addition to preventing the adhesion of oil droplets, the insulating material is protected by two liquids, which has the effect of allowing extremely accurate detection of the displacement of the steel plate.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of a steel plate shape detection device according to an embodiment of the present invention, Fig. 2 is a block diagram showing a conventional steel plate shape detection device, and Fig. 3 shows the main parts of the above conventional device. FIG. In the figure, 1-object to be measured (steel plate), 4a-external force application device, 4b-displacement detector, 26-insulating material, 28-compressed air blowing device, 29-upper plate. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] an external force applying device that applies magnetic force to a traveling steel plate; a plurality of capacitive displacement detectors installed at predetermined locations in the width direction of the steel plate to detect displacement of the steel plate due to application of magnetic force;
In a steel plate shape detection device that includes a water-repellent insulating material covering the surface of each of the displacement detectors and detects the shape of the steel plate from the output distribution of the plurality of displacement detectors, A steel plate shape detection device comprising: a compressed air blowing device that blows compressed air toward the surface of the insulating material; and an upper plate that protects the insulating material.