JPS5930406Y2 - Flatness measurement device for hot rolled plate materials - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a flatness measuring device for hot rolled material using an eddy current displacement meter.

The eddy current detector of the eddy current displacement meter is robust and suitable for use in harsh environments, but it has low heat resistance and the detection surface must be placed close to the target object to improve detection accuracy. In the conventional flatness measuring device, which measures the flatness of a hot rolled material by arranging a plurality of them in the width direction of the hot rolled material and detecting the distance of the hot rolled material to the detection surface, the eddy current detector is placed in a water tank. The device is cooled by being immersed in circulating cooling water.

In this conventional water cooling method, the outer surface of the water tank that receives heat radiation is cooled by overflowing cooling water from inside the water tank, so the thickness of the cooling water layer above the detection surface of the eddy current detector is fluctuate.

This variation in layer thickness becomes a major disturbance factor for the eddy current detector.
In addition, it is difficult to obtain high measurement accuracy with the conventional cold water method because scale and other particles may fall into the water tank through the overflow hole. The drawback is that maintenance of the mechanism for moving the inter-rolled plate material in the width direction is troublesome, and a long life cannot be expected.

This idea was made in order to eliminate the above-mentioned drawbacks of the conventional method.The eddy current detector is housed in a sealed box with multiple pipes arranged side by side, which also serves as a protective fence, and the heat radiation of this sealed box is reduced. By forming a water film on the outer surface that receives water and cooling it with flowing cooling water, it is possible to obtain more accurate measurement results than before, and it is also easy to maintain and has a long service life. An object of the present invention is to provide a flatness measuring device for rolled plate material.

An embodiment of this invention will be described below with reference to the drawings.

In Figure 1, 1 is a sealed box with an eddy current detector (
Eddy current displacement meter sensor) 2, 3a, 3b.

4a and 4b are housed in a line with their detection surfaces close to the inner surface of the earthen wall.

The eddy current detector 2 is fixed to the center of the sealed box 1.

The eddy current detectors 3a and 4a and 3b and 4b are respectively disposed symmetrically with respect to the eddy current detector 2, and are screwed to a screw rod 6 driven by a motor 5, and are connected to the screw rod 6 and a guide 7. It is configured to be driven by a drive mechanism consisting of.

Eddy current detectors 3a and 3b and 4a and 4b move in opposite directions, respectively.

8 and 9 are partition walls, and on both sides of the eddy current detector 2, the top ga, 9
A is provided on the same plane as the upper wall 1A.

The left and right side walls IB of the sealed box 1, and the upper end 1b of the IC.

1c projects slightly higher than the tops 8a and 9a.

The upper wall 1A includes eddy current detectors 2, 3a, 3b, and 4a.

The part corresponding to the spread range (action area) of electromagnetic waves emitted from 4C, that is, between the tops 8a and 9a, between the top 8a and the left side wall 1B
Meanwhile, the area between the top 9a and the right side wall 1c is constituted by an electrical insulator 10.

As the electrical insulator 10, ceramics, glass, resin, etc., which have low water absorption properties, are used.

The upper end portions 1b, 1c and the top portions 8a, 9a are located outside the above range of action of the eddy current detector, which is within a range of 45° to 55° from the detection surface.

Reference numeral 11 denotes a watering pipe, which is installed on the upper wall 1A of the hermetic box 1, and in this embodiment has a top part f as shown in an enlarged view in FIG.
It is provided on 3a and 9a with the direction facing the width direction,
A large number of water sprinkling holes 11a are bored at uniform intervals on both sides thereof.

This water pipe serves as a protective barrier to prevent the rolled material from colliding with the electrical insulator 10.

The water pipes 11 are connected to the respective tops 8a and 9a of the partition walls 8°9.
may be extended to the same height as the upper end portions i b and 1 c, and this extended portion may be made hollow and utilized, as shown in the figure, the upper end portion 1 b of the left wall 1 B and the upper end portion of the right wall 1 C. 1c is made hollow and used as a water sprinkling pipe 11.

12 is a water supply pipe for cooling water, and supplies cooling water to the sprinkler pipe 11.

Reference numeral 12 denotes an air supply pipe for cooling, which opens into the sealed case 1.

When in use, the hermetic box 1 has the eddy current detector 2 positioned at the center in the width direction of the pass line PL, as shown in FIG.
The eddy current detector array is disposed between the rolling rolls 14 and 15 so as to be orthogonal to the pass line PL, and with its upper surface lower than the pass line PL by a predetermined minute distance.

The flatness of the hot-rolled material is determined by inputting a level electrical signal proportional to the distance between the detection surface of each eddy current detector and the hot-rolled material passing through the top surface of the sealed box 1 to a measuring section (not shown) through the respective leads 16. As a result, measurements and display are performed in the same way as before.

During measurement, the water sprinkling holes 11 of each water sprinkling pipe 11 are installed in the sealed box 1.
Cooling water is sprayed through a.

Since a plurality of dispersion pipes 11 are provided, the cooling water flows as a water film over the entire upper surface of the sealed box 1, and then flows down as a water film over the entire front and rear surfaces.

Therefore, all surfaces of the sealed box 1 that receive heat sub-radiation are cooled by the cooling water.

The water film formed on the upper surface of the upper wall 1A is caused by cooling water sprayed onto the upper wall 1A from a large number of water sprinkling holes 11a arranged in parallel at uniform intervals, so that the water film always flows down with a uniform thickness. .

Therefore, the cooling water does not affect the output of the eddy current detector, and the influence is made constant.

Further, even if scale or the like falls from the hot-rolled material onto the sealed box 1, it is removed by the cooling water flowing through the earthen wall IA.

As described above, according to this invention, in a flatness measuring device for rolled material in which a plurality of eddy current detectors are disposed in a housing, the housing is a sealed housing, and the eddy current detectors on the top surface of the flatness measuring device are configured to act as a sealed housing. By installing a water sprinkling pipe outside the area and allowing the cooling water to flow down, the water sprinkling pipe does not interfere with the detection operation of the eddy current detector, and the water flows above the above-mentioned surface above the detection surface of the eddy current detector. Cooling water flows forming a uniform water film,
In addition, metal objects such as scales that may cause disturbance to the eddy current detector are also washed off from the top surface of the sealed casing by the cooling water. The device can be used for a long period of time because the adverse effect on the detection accuracy of the device can be eliminated, and the water pipe serves as a protective fence for the rolled material.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the flatness measuring device according to the invention on the actual flow side, FIG. 2 is a partially enlarged perspective view of the above embodiment, and FIG. 3 is a usage state diagram of the above embodiment. In the figure, 1... Sealed box, 1A...
・Top wall, 2.3a, 3b t 4a, 4b...
... Eddy current box, 10 ... Electrical insulator, 11
. . . Water supply pipe, 13 .

Claims (2)

[Scope of utility model registration request] (1) In an apparatus for measuring the flatness of a hot rolled plate material, a housing is provided below the pass line in a direction perpendicular to the pass line, and a plurality of eddy current detectors are disposed inside the housing.
The above-mentioned case is a sealed old body, and the longitudinal direction of the case is 1 on the top surface of the case.
7 consisting of electrical insulators arranged in parallel at intervals in the direction
Outside the action area of the current detector, a water sprinkling pipe that also serves as a protective shelf with many water sprinkling holes on the side is fixedly extending in the direction of movement of the rolled plate material, and an air supply pipe that feeds cooling gas into the sealed casing is installed. The plurality of eddy current detectors are connected to each other, and the central part of the plurality of eddy current detectors is fixed, and each of the plurality of eddy current detectors is disposed on both sides of the fixed detector so as to be movable from side to side in the longitudinal direction. Flatness measuring device for hot rolled plate materials. (2) Both side walls of the sealed casing and the upper parts of the plurality of partition walls located between the two side walls are extended and protruded from the upper surface of the sealed casing, and the extended and protruded portions are made hollow to serve as water sprinkling pipes. An apparatus for measuring the flatness of a hot rolled plate material according to claim (1) of the registered utility model, characterized in that: