JPS6038169Y2 - Rolled material thickness measuring device - Google Patents

Description

[Detailed description of the invention] The present invention is a plate thickness measuring device for rolled materials, in particular, the thickness of a steel plate being rolled is measured using a transmitting means and a receiving means of a thickness gauge using radiation sources such as X-rays and γ-rays. related to a device for

For example, a C-frame type X-ray thickness gauge or γ-ray thickness gauge is used to measure the thickness of a rolled material during rolling.

This involves attaching an X-ray transmitting part and a receiving part to a C-shaped frame, passing the material to be measured (rolled material) between them, and measuring the plate thickness from the change in the air gap between the transmitting part and the receiving part. .

``In this case, the distance between the transmitter and the receiver is fixed by the C-shaped frame.

Conventionally, when installing this type of thickness gauge near the rolling mill, it was necessary to place it between the rollers of the table behind the turning table, and to prevent damage to the equipment due to warping of the steel plate during rolling. It is necessary to keep a certain distance and to separate the C frame of the thickness gauge from the table surface.

Specifically, the distance from the center of the rolling mill to the thickness gauge is set to several W, and the air gap between the transmitting and receiving sections is set to 2 to 377L to prevent collisions with the steel plate.

Automatic plate thickness control in rolling mills, especially plate thickness control (AGC) using a gauge meter, is governed by the accuracy of the gauge meter method, so the actual measured value by the thickness meter and the calculated thickness value by the gauge meter are compared. By correcting this error, we aim to improve the accuracy of the gauge meter type.

However, as mentioned above, the C-frame type X-ray thickness gauge is located quite far from the rolling mill, so the time delay is too large to incorporate it into the AGC loop, making it difficult to correct it within the same pass. Therefore, the only method available was to reflect the error in that pass to the next pass or the next rolled material.

This invention can be installed very close to the rolling mill with a small air gap without causing any trouble with the equipment near the rolling mill, and can also prevent equipment damage during rolling due to warping of the steel plate. An object of the present invention is to provide a plate thickness measuring device for rolled material that can measure plate thickness.

For this purpose, the present invention has one of the transmitter and receiver of an X-ray thickness meter or gamma-ray thickness meter attached to the stripper guide attached to the rolling mill, and the other installed at the bottom of the roller table. As a result, the accuracy of actual plate thickness measurement is improved, and when performing plate thickness control, the actual plate thickness measurement value is incorporated into the AGC loop within the same pass during rolling to perform feedback control. becomes possible.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Figure 1 shows a rolling mill 1 equipped with a plate thickness measuring device according to the present invention.
2 is a side view schematically showing an X-ray transmitting section 2 and an X-ray receiving section 3, which are installed separately at a position very close to the exit side of the rolling mill.

4 is a rolled material, 5 is a table roller, and 6 is an arithmetic control device for an X-ray thickness gauge.

In the present invention, the transmitting section 2 and the receiving section 3 are not fixed to a conventional C-shaped or U-shaped frame, but are installed independently.

Further, in this embodiment, the transmitting section is disposed below the rolled material 4, and the receiving section is disposed above it, but the transmitting section may be disposed upside down.

FIG. 2 is a partial side view showing in detail the vicinity of the transmitting section 2 and receiving section 3 of the measuring device shown in FIG. 1 in an enlarged manner.

In this figure, 22 is a housing of the rolling mill 1, 27 and 27' are upper and lower backup rolls, 28 and 28' are upper and lower work rolls, and 24 is a chock of the upper backup roll 27.

These upper backup rolls 27, chocks 24, and upper work rolls 28 are raised and lowered as one by a lowering device (not shown).

25 is a balance banger for the upper backup roll 27, which is suspended from a balance cylinder (not shown).

The scraper 26 is rotatably supported by the pin 11 of the rester 8 attached to the roll chock 24 described above.

The stripper guide 7 located in front of the stripper guide 7 guides the tip of the rolled material 4 to the work rolls 28 and 28' of the rolling mill 1, and is used to guide the tip of the rolled material 4 to the work rolls 28 and 28' of the rolling mill 1. It is rotatably supported by a pin 12 attached to a scaling device (not shown).

The pin 14 of the bracket 9 attached to the balance banger 25 and the pin 1 of the rear end of the stripper guide 7
The guide is biased counterclockwise by a balance cylinder 10 mounted between the pin 12 and the pin 12 as a fulcrum.

As a result, the tip 21 of the stripper guide 7 is rotated in the direction of the arrow A, and force is applied to the scraper 26 engaged with the tip 21 in the direction of the arrow B using the pin 11 as a fulcrum, so that the tip of the scraper and the upper work roll 28 is in contact with the outer periphery.

The X-ray receiving section 3 is attached to the bracket 16 of the stripper guide 7 at the center position of the rolled material 4 in the width direction.

The aforementioned X-ray passage hole 17 is bored in the lower surface of the bracket 16 and the stripper guide.

The X-ray transmitting section 2 is installed on a beam 19 attached to the housing 22 below between the table rollers 5 at a position corresponding to the receiving section 3 .

When the rolled material 4 is between the transmitting part 2 and the receiving part 3, the receiving part 3 receives the X-rays transmitted from the transmitting part 2, and detects the plate thickness from the air gap at this time.

In this case, the stripper guide 7 moves up and down as the upper work roll 27 moves up and down in accordance with the thickness of the outlet side of the rolled material 4 .

Therefore, there is an advantage that the distance between the upper surface of the rolled material and the receiving section 3 is constant regardless of the outlet side plate thickness, when the plate thickness accuracy is ignored.

The diameter of the work roll changes due to wear of the roll, etc., which affects the plate thickness accuracy, and the distance H between the transmitting part 2 and the receiving part 3 changes depending on the roll opening degree set for each rolling bus. Although the gap changes, the former (roll diameter change) is corrected in advance, and the latter is corrected in accordance with the screw position for each pass.

That is, the distance between the transmitting part and the receiving part can be calculated in advance from the position of the lowering screw, and the air gap is calculated and corrected online using the movement of the lowering screw.

In this invention, the transmitting part and the receiving part are separated from each other independently compared to the conventional case, so there are no restrictions on equipment compared to the case of fixing with a conventional C frame, and it can be placed much closer to the rolling mill. In addition, there is no problem with warping of the rolled material because the rolled material normally warps along the stripper guide, and even if it collides with the guide, it will escape together with the guide. There is no problem.

Regarding the correction of the air gap mentioned above, the above-mentioned transmitter,
By installing a distance meter using an optical sensor at the same location as the receiver, it is also possible to determine the air gap between them.

In the present invention, the transmitting section and the receiving section can be installed at a position of about 1.5 m from the center of the rolling mill with an air gap of 1 to 2 m, which has the following advantages.

(b) As the air gap becomes smaller, the accuracy of actual plate thickness measurement improves.

(b) Since the plate thickness detection end is close to the rolling mill, there is no delay when using the actual plate thickness measurement value for automatic plate thickness control, and therefore there is no delay in incorporating this actual measurement value into the AGC loop. Value AGC becomes possible.

As a result, while the plate-to-plate thickness accuracy of AGC using a conventional gauge meter was 100 to 150μ with a standard deviation of 1σ, the absolute value AGC that uses feedback control of the absolute plate thickness deviation to which the present invention is applied 20 equivalent to measurement accuracy
An accuracy of ~40 μm can be distantly related.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of a rolling mill equipped with the plate thickness measuring device according to the present invention, and Fig. 2 is a side view showing in detail the vicinity of the guide device of the rolling mill equipped with the measuring device of the present invention. . 1... Rolling mill, 2... Transmission section, 3...
...Receiving section, 4...Rolled material, 5...
・Table roller, 7・Track ・Stopper guide, 17...
...passing hole, 26...scraper

Claims (1)

[Scope of utility model registration request] In a plate thickness measuring device that measures the thickness of a steel plate being rolled using a transmitting means and a receiving means, either the transmitting part or the receiving part is attached to the upper part of the stripper guide attached to the rolling mill by providing a through hole therein. , and the other is installed at the bottom of a roller table.