JP2551678B2 - Non-contact type foil thickness measuring device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for measuring the foil thickness of a rolled metal foil such as an aluminum foil, and particularly to an X-ray, β while blowing a purging air onto the rolled metal foil immediately after rolling. The present invention relates to a non-contact type foil thickness measuring device adapted to measure the thickness of the rolled foil by irradiating radiation such as lines.

2. Description of the Related Art For example, control of the plate thickness or foil thickness during rolling of a metal plate or metal foil such as aluminum is performed by irradiating the rolled plate or rolled foil immediately after rolling with radiation such as X-rays or β-rays. A device for measuring the temperature is installed on the outlet side of the rolling mill, and the measurement results are fed back to automatically control the unwinding tension, the rolling speed, the pressing force, and the like.

Such a non-contact type thickness measuring device is designed to inject dry air for purging toward the measured site of the measured metal rolled plate or rolled foil immediately after rolling for the purpose of eliminating a measurement error due to scale adhesion. ing. Such a measuring device is capable of performing measurement without contact with a rolled plate or rolled foil, and is convenient in that it does not cause contact scratches on the object to be measured, and when the object to be measured is a metal rolled plate. There will be no inconvenience.

However, when the measurement object is a rolled metal foil,
There is a problem that a local wrinkle is generated in a measured portion of the rolled foil, and if the rolled foil is wound in such a wrinkled state, it becomes a defective product. On the other hand, it is conceivable to set the winding tension high in order to extend such wrinkles, but if it is set too high, the foil may break or the shape of the wound foil may be defective.

This invention has been made to solve the above-mentioned problems, and is a non-contact type foil thickness measuring device, which does not cause wrinkles in the measured metal rolling foil due to the measurement. It is intended to be provided.

Means for Solving the Problem Wrinkles occur in the rolled foil immediately after measurement when measured using the above-described measuring device, for purging that is injected to the measured portion with respect to the temperature of the rolled foil immediately after rolling. The inventor has found that the temperature of the air is relatively low, which results from local cooling of the rolled foil and local heat shrinkage.

The present invention was made based on such findings,
The thickness of the rolled foil (A) is measured by irradiating radiation such as X-rays and β-rays while injecting purging air (C) toward the measurement site of the rolled metal foil (A) immediately after rolling. In the non-contact type foil thickness measuring device (B) configured as described above, the purging air is preliminarily applied so that the heated purging air (C) is jetted toward the measurement site of the rolled foil (A). The non-contact foil thickness measuring device is characterized by comprising heating means (9) (10) for heating.

The purging air is heated by the working heating means, and the heated purging air is sprayed onto the rolled foil immediately after rolling. Therefore, the temperature difference between the rolled foil immediately after rolling and the purging air sprayed on the measured portion is eliminated or reduced. Therefore, the local heat shrinkage caused by the local cooling of the rolled foil is eliminated or reduced, and the rolled foil is not wrinkled.

In order to completely eliminate or almost eliminate the generation of wrinkles, it is desirable to set the temperature of the air to be equal to or close to the temperature of the rolling foil to be measured.

Embodiment Hereinafter, the present invention will be described based on illustrated embodiments.

As shown in FIGS. 1 and 2, the rolled aluminum foil (A) rolled by the working roll (2) of the rolling mill (1) is guided to the delivery side guide rolls (3) and (3) and wound. The foil is wound around the take-up reel (4), and the foil thickness is measured between the working roll (2) and the guide roll (3).

Between the working roll (2) and the delivery side guide roll (3), the foil thickness measuring unit (b) of the foil thickness measuring device (B) is arranged such that the rolled foil (A) is vertically separated. The upper arm measurement part (b1) and the lower arm measurement part (b2) are provided with an X-ray emission port and an entrance port, and a purging air injection port (5) (5), respectively, at corresponding positions on the upper arm measurement part (b1). Has been.

Then, X-rays are radiated from the radiation port of the foil thickness measuring unit (b) to the measurement site of the rolled foil (A) immediately after rolling, which is rolled by the working roll (2), and are incident on the incidence port. By doing so, the foil thickness of the rolled foil (A) is continuously measured. In this measurement, the X-ray emission port,
If a scale such as a foreign substance adheres to the entrance and the measured part of the measured rolled foil (A), a measurement error will occur. Therefore, the purging air (C) is jetted from the upper and lower purging air jet ports (5) and (5) of the measuring section (b) toward the measurement site.

The above-mentioned structure is the same as that of the conventional foil thickness measuring apparatus, but in this embodiment, the air is preheated when the purging air (C) is jetted. The reason for heating in this way is as follows. That is, when air at room temperature is used as the purging air (C) as in the prior art, the temperature of the purging air (C) is relatively lower than the temperature of the rolled foil (A) immediately after rolling, As the rolled foil (A) is locally cooled and contracted locally, local wrinkles (a) are generated at the measurement site of the rolled foil (A) as shown by the broken line in FIG. Because it does. For the above reason, the purging air (C) is
It is desirable to set the same temperature as that of the portion to be measured of the rolled foil (A) or a value as close as possible to the temperature.

Purging air (C) is, as shown in FIG.
Air supply pipe (7) from air supply device (6)
Each air injection port (5) of the measuring part (b) through (8)
Guided to (5), steam pipes (heating means) (9) and (10) are installed along a part of the pipes (7) and (8), so that the inside of the air supply pipes (7) and (8). The air passing through is indirectly heated. Opening and closing solenoid valves (11) (12) are installed on the inlet sides of the steam pipes (9) (10) to adjust the temperature of the air.
Temperature sensors (13, 14) for measuring the air temperature after heating are attached to the air supply pipes (7, 8) so that the purging air (C) can be adjusted to a predetermined temperature. In the figure, (15) is a heat insulating material.

The heating sources of the heating means (9) and (10) are not limited to steam, and it goes without saying that other means such as electricity can be used.

In the above examples, the foil thickness measurement of the aluminum rolled foil was described as an example, but the measuring device according to the present invention is not necessarily limited to the measurement of the aluminum foil, and in the case of the measurement of other metal rolled foils. Also applies to.

EFFECTS OF THE INVENTION The foil thickness measuring device according to the present invention is a non-contact type that utilizes radiation such as X-rays and β-rays, so that contact scratches on the rolled foil are measured along with the measurement of the metal foil to be measured. Not only there is no risk of attaching, but means for heating the purging air is provided, and the air heated by the means is adapted to be jetted toward the measurement site of the rolling foil, so that it is immediately after rolling. It is possible to eliminate or reduce the difference between the temperature of the rolled foil and the temperature of the purging air sprayed onto the measured portion. For this reason, local cooling of the rolled foil and local thermal shrinkage caused by it are eliminated, and it is possible to avoid the inconvenience that wrinkles are generated in the measured metal rolled foil. Therefore, it is possible to save the troublesome work of finely adjusting the winding tension to extend the wrinkles, improve the production efficiency, and eliminate defective products.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a schematic perspective view showing the vicinity of a foil thickness measuring section on the delivery side of a rolling mill, and FIG.
FIG. 3 is an explanatory diagram showing a schematic configuration on the delivery side of the rolling mill, and FIG. 3 is an explanatory diagram showing a configuration of heating means for purging air. (1) …… Rolling mill, (9) (10) …… Heating means, (A)
…… Metal rolled foil, (B) …… Foil thickness measuring device, (C) ……
Air for purging.

Claims (1)

(57) [Claims] 1. An X-ray while jetting purging air (C) toward a measurement site of a rolled metal foil (A) immediately after rolling.
The rolled foil (A) by irradiating with radiation such as β rays
In the non-contact type foil thickness measuring device (B) adapted to measure the thickness of the rolled foil (A), the heated purging air (C) is jetted toward the measured portion of the rolled foil (A). A non-contact type foil thickness measuring device comprising heating means (9) (10) for pre-heating the purging air.