JPS5815847Y2 - Housiya Senatsusa Sokutei Souchi - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of a radiation thickness measuring device used, for example, as a detection unit for measuring the thickness of a rolled metal plate in the automatic control system of a single metal plate product or a metal plate rolling mill. In particular, it relates to a measuring device that measures the thickness of a metal plate as an object to be measured by setting the thickness measurement points at the center and edge points of the metal plate and simultaneously performs continuous measurements, and can also be used for metal plates of different widths. It is an object of the present invention to provide a measuring device that can be easily set to follow a measurement point, does not cause measurement errors, and is easy to maintain and handle.

For example, as a thickness measuring device used as a thickness detecting section of a rolled metal plate in an automatic control system of a rolling mill, a radiation thickness meter that can perform contactless measurement is often used.

Moreover, in order to control the rolling mill to improve the product quality of rolled metal sheets, precision in thickness measurement is required. A multi-point measurement method is used to determine the quantity.

This measurement point is usually determined at the center and edge of the metal plate.

Also, since the width of the metal plate differs depending on the product,
For objects to be measured with different widths of metal plates,
It is necessary to be able to follow the measurement position of the thickness gauge.

Conventionally, devices such as those shown in FIGS. 1 to 3 were initially employed as the above-mentioned thickness measuring device.

In FIGS. 1 to 3, reference numeral 1 denotes a metal plate as an object to be measured, which is transported on a roller conveyor 2 in the direction of arrow A.

The thickness of the metal plate 1 is measured continuously at two locations on the center line M1 and edge line M2.

Two transmission type radiation measuring devices 3A and 3B are prepared for thickness measurement at these two locations, and each device 3A and 3B is moved at a position displaced from the direction A of the metal plate 1, respectively. It is arranged to run on rails 4A and 4B installed perpendicular to direction A.

Each device 3A and 3B has a C-shaped frame 5A and 5B moving on rails 4A and 4B, each frame 5A,
It consists of a detector 6 and a radiation source container 7 fixedly installed at the upper and lower open ends of 5B, respectively.

As is well known, the thickness measurement by each measuring device 3A, 3B is performed because the radiation emitted from the radioisotope installed in the radiation source container 7 is attenuated when it passes through the metal plate 1, which is the object to be measured. By measuring this amount of attenuation with the detector 6, the thickness is measured in accordance with the known material of the object to be measured.

However, the conventional configuration described above not only requires installation space for two machines, but also makes it impossible to measure the center M1 and edge M2 on the same cross section of the metal plate 1, resulting in measurement points at different cross-sectional positions. The round amount cannot be measured accurately.

For this purpose, the configuration shown in FIG. 4 is implemented in which two sets of thickness gauges are installed on the same frame so that the center M1 and edge M2 of the metal plate 1 to be measured can be measured at the same cross-sectional position.

In FIG. 4, a pair of detectors 6A and a radiation source container 7A are fixedly installed at the open upper and lower ends of a C-shaped frame 5 that runs on a rail 4.

On the other hand, the other set of detectors 6B1 and source container 7B are supported by a chain 9 stretched between gears 8 within the frame 5, and are moved relative to the frame 5 in the direction of arrow B by a chain transfer method by a drive motor 10. The first set of detectors 6 is fixedly installed.
A. It is configured so that the distance between it and the radiation source container 7A can be adjusted relatively.

Reference numeral 11 indicates a self-propelled drive motor of the frame 5.

In the configuration shown in FIG. 4, the second set of detectors 6B, the radiation source container 7B
arrow B from the solid line position to the chain line position with respect to frame 5
Since movement can be set in the direction, even if the width of the metal plate 1 to be measured is changed, follow-up movement can be performed to a predetermined center or edge measurement location at the same cross-sectional position of the metal plate 1.

Therefore, compared to the configurations shown in FIGS. 1 to 3, the measurement position shift in the transport direction of the metal plate 1 is eliminated.

However, since one set of radiation source container 7B and detector 6B is moved and operated via gear 8, chain 9, etc., during long-term use, wear of gear 8, elongation of chain 9, etc. may cause detector 6B and radiation source container to move. The relative position with respect to 7B may deviate from the initially set relative position.

For this reason, the radiation source container 7 is
The radiation dose received by the detector for the radiation beam from B changes, causing an error in the thickness measurement.

The purpose of the present invention is to eliminate the drawbacks of the conventional configuration described above, and to create a thickness measuring device that is easy to handle and does not cause relative positional deviation between the radiation source container and the detector, which can cause measurement errors even after long-term use. The purpose of this invention is to provide a first C-shaped frame that is self-propelled relative to the object to be measured, and a pair of radiation source containers and detectors that are fixedly installed at the open upper and lower ends of the frame, respectively. , formed independently of the first C-shaped frame.
, and is achieved by providing a second C-shaped frame that runs on its own on the first C-shaped frame, and a pair of radiation source containers and detectors fixedly installed at the open upper and lower ends of the second C-shaped frame, respectively. be done.

Next, the present invention will be explained with reference to illustrated embodiments.

5 and 6, relative to the metal plate 1 to be measured that is transferred on the roller conveyor 2 in the direction perpendicular to the plane of the paper, in the illustrated example, the installation is perpendicular to the direction of transfer of the metal plate 1. The first C-shaped frame 5 that runs on the rail 4i [
is placed.

A pair of detectors 6 and a radiation source container 7 are fixedly installed at the open upper and lower ends of the frame 5, respectively, facing predetermined positions.

The first C-shaped frame 5I is moved on the rail 4I by a self-propelled drive motor 111.

Furthermore, a second C-shaped frame 5■ is provided which is small and independent from the first C-shaped frame 5I. C of
It is movably arranged on a rail 4■ installed in the same direction as the self-propelled rail 4I of the shaped frame 5■.

The second C-shaped frame 5■ is driven by a self-propelled drive motor 11■ to move the first C-shaped frame 5I on the rail 4■ as shown by arrow B.
and relatively self-propelled.

A pair of detectors 6 and a radiation source container 7 are fixedly arranged at predetermined positions at the open upper and lower ends of the second C-shaped frame 5.

The measurement operation in the above configuration is as follows.

First, the first C-shaped frame 5I is moved by itself relative to the metal plate 1 to be measured so that its radiation source container 7 and detector are set at the center measurement point M1.

Next, in response to an external signal corresponding to the width of the metal plate 1, the second C-shaped frame 5 is set so that its radiation source container 6 is set at the edge measurement point M2, which is a predetermined distance inside the side line of the metal plate 1. , are moved along the rail 4■ on the first C-shaped frame 5I.

If the width of the metal plate 1 to be measured is different, the center and edge measurement points M1 and M2 corresponding to the width are moved and set in the same manner as described above, and then the thickness is measured by transmitting radiation.

According to the above-mentioned configuration according to the present invention, the second C-shaped frame 5■ is formed as a rigid frame having a frame structure of rigid joints like the first C-shaped frame 5I. The relative position with respect to the source container T is always unchanged, and if rail 4
The same thing happens if (2) wears out during long-term use.

Therefore, the radiation irradiated from the radiation source container 7 is correctly detected by the detector 6, and stable measurement accuracy is obtained by eliminating relative positional deviations that cause measurement errors as shown in FIG. I can do it.

Furthermore, even if the width dimension of the object to be measured changes, it is easy to follow the center and edge measurement points on the same cross section, and maintenance and handling are also much easier compared to the configuration shown in Figure 4. .

Although the illustrated example shows an example in which the metal plate to be measured is moved and the measuring device is stopped at a predetermined position for measurement, the present invention further has the metal plate to be measured stopped at a predetermined position. By configuring the C-shaped frame so that it can move by itself not only in the width direction of the metal plate to be measured but also in the length direction, it is possible to continuously measure a predetermined measurement point over the entire length of the object to be measured. It can also be implemented in devices that

In this case as well, the same effects as in the previous embodiment can be obtained with the second C-shaped frame.

As described above, according to the present invention, it is possible to provide a transmission type radiation thickness measuring device that is free from the risk of measurement errors even during long-term use and is advantageous in terms of maintenance and handling.

[Brief explanation of the drawing]

Figures 1 to 3 are a plan view, a front view, and a side view of a conventional measuring device, respectively, Figure 4 is a side view of another example, and Figure 5 is a side view of another example.
6 are a side view and a rear view of an actual case of the present invention, respectively. 1: Object to be measured, 4I: Self-propelled rail of first C-shaped frame, 4■: Self-propelled rail of second C-shaped frame, 5■: First
C-shaped frame, 5 ■: second C-shaped frame, 6: detector, 7: radiation source container, 111° 11 ■: self-propelled drive motor,
Ml: Center measurement point, M2: Edge measurement point.

Claims (1)

[Scope of utility model registration request] A first C-shaped frame that is self-propelled relative to the object to be measured, a set of radiation source container and detector fixedly installed at the open upper and lower ends of the frame, and independent of the first C-shaped frame. a second C-shaped frame that is self-propelled on the first C-shaped frame, and a set of radiation source containers and detectors fixedly installed at the open upper and lower ends of the second C-shaped frame, respectively. A radiation thickness measuring device characterized by: