JP2814932B2 - Aging method for X-ray generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aging method for an X-ray generator, and more preferably to an aging method for an X-ray generator used in an X-ray thickness gauge for measuring the thickness of a steel sheet in a rolling facility. .

[0002]

2. Description of the Related Art The thickness of a steel sheet during or after rolling in a rolling facility is one of the most important control items for quality control. When measuring the thickness of the steel sheet, for example, an X-ray generator is used. Is used.

In this X-ray thickness gauge, the X-ray generator X
X-ray generators, especially X-ray tubes, have a relatively short life and are mostly between less than 1 year and 5-6 years. Therefore, for defective products, it is necessary to replace the X-ray generator including the X-ray tube, transformer, rectifier and resistor.

On the other hand, a new X-ray generator to be replaced for a defective product or an X-ray generator left unattended for a certain period of time has a tube voltage applied to the X-ray tube of tens of thousands of volts. Since the pressure is as high as several hundred thousand volts, it is necessary to perform aging (preheating before use) before use.

Conversely, if the above-mentioned high pressure is applied to the X-ray tube at a stretch without aging, the stress becomes excessively large, causing breakage.

[0006] For this reason, conventionally, in the aging work of this type of X-ray generator, the X-ray generator is attached to an X-ray thickness gauge installed in an actual rolling line, and then the tube voltage controller is installed. The voltage was gradually increased manually for several hours to several tens of hours. After aging, the inspector judges whether or not the X-ray generator can be used, and if it is a good product, it has been used as an X-ray thickness gauge through various adjustment operations.

[0007]

However, in the prior art, the quality of the X-ray generator is determined after the aging is finally completed over a certain period of time. The quality of the line generator cannot be determined. Therefore, if the X-ray generator is defective, it is necessary to bring in another X-ray generator to replace it and carry out the aging operation again.

[0008] Thus, performing the aging operation in the on-site X-ray thickness gage requires the installation of the X-ray generator with respect to the X-ray thickness gage if the X-ray generator is defective. Removal time is wasted, and
Unless the aging is completed, the quality cannot be determined, and as a result, a lot of manpower and time are required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dedicated aging apparatus in which aging and pass / fail judgment are separately performed in advance, thereby saving labor and ensuring the pass / fail judgment.

[0010]

In order to solve the above-mentioned problems, the present invention measures the thickness of a steel sheet in a rolling facility.
An aging method for gradually increasing a voltage applied to an X-ray tube of an X-ray generator attached to an X-ray thickness gauge to judge the quality of the X-ray generator, comprising:
The X-ray thickness gauge is installed separately from the X-ray thickness gauge,
An X-ray detector is provided opposite to the X-ray generator, and a tube voltage is stepwise increased with respect to the X-ray generator.
X by the aging pattern set according to the thickness
Changing the tube voltage of the line generator automatically, automatically determine the applied tube voltage the quality of the X-ray generator by the correlation between the detection voltage in the X-ray detector in this tube voltage change process configuration And

[0011]

In the present invention, an aging device is installed separately from the final installation site of the X-ray generator, for example, the X-ray thickness gauge. For example, the X-ray generator to be attached to the X-ray thickness gauge is pre-aged. Can be kept.

Conventionally, the inspector has performed aging for a long time, but it was not possible to avoid the variation of the aging pattern due to the heavy load. Since the aging pattern is automatically given from the apparatus side, the aging work can be made constant and the reliability is high.

Further, as an aging device, an X-ray detector is provided opposite to the X-ray generator. Therefore, it is possible to obtain a correlation between the applied tube voltage in the tube voltage change process and the voltage detected by the X-ray detector, and it is possible to determine the quality of the X-ray generator based on the correlation result. As a result, the quality can be determined by the aging device, and only the non-defective product needs to be installed at the actual installation site of the X-ray generator. The frequency of installation and removal operations can be reduced more reliably than in the case of judgment.

In addition, conventionally, the quality is judged after the aging is completed. In contrast, according to the present invention, the quality can be judged even in the process of the aging based on the correlation, and the defective product can be determined. With regard to, the aging may be stopped halfway and a new X-ray generator may be brought in to judge the quality, and for a good product, aging can be performed as it is until a predetermined end time, and as a result, in a short time Only good products can be installed at the final installation site.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic diagram of an aging device according to the present invention. The basic configuration of the aging device includes an X-ray tube 1 constituting a main element of the X-ray generator, a drive circuit 2 for operating the X-ray tube, and a detector 3 arranged to face the X-ray generator 1 for detecting an X-ray dose. A calibration plate 4 that is provided between the drive circuit 2 and the drive circuit 2, the detector 3, and the calibration plate 4.
And an operation control unit 6, an operation display unit 7, and a recording unit 8 that operate via the input / output device 5 for.

Aging of the X-ray generator 1 is started by pressing an aging start button on the operation display unit 7. In the arithmetic and control unit 6, for example, an aging pattern as shown in FIG. 2 is set for each thickness of the target steel sheet (thick hot-rolled steel sheet and thin cold-rolled steel sheet). That is, the tube voltage is set to increase stepwise with time, and after a predetermined time has elapsed, the tube voltage is maintained and maintained at a low level.

Aging is started in accordance with the aging pattern. In the process, the detector 3 detects the X-ray dose as a voltage. Thereafter, the X-ray dose is detected while sequentially increasing the tube voltage. In the embodiment, for example, when the tube voltage becomes 80 KV, the detected voltage exceeds 10 V. Therefore, the calibration plate 4 is moved to the X-ray generator 1 by its operating section 4A. And the detector 3 to make the detection voltage 10 V or less.

In the aging process, the current X-ray tube 1
Is fed back from the X-ray generator 1, is displayed on the operation display unit 7 through the arithmetic control unit 6, and compares the command signal and the feedback signal with the tube voltage abnormality detector 6A. If the deviation exceeds the ± threshold, the power supply of the X-ray drive circuit 2 is turned off.

On the other hand, the detected voltage from the detector 3 is recorded as it is in the first pen portion 8A of the recording portion 8, and
The correlation between the current applied voltage to the X-ray generator 1 and the current applied voltage to the X-ray generator 1 is recorded in the second pen unit 8B of the recording unit 8. In this display mode, a comparison between the current applied voltage and the detected voltage is made by the pass / fail determination circuit 8B. For example, as shown in FIG. 0V for 8B, 5V if below
Is output. If the maximum and minimum values of the detected voltage are within the threshold value, the voltage is 0 V, if the value is not less than 7.5 V, and if the detected voltage is small and the fluctuation is large, 10 V.
Is output and recorded while classifying the defect state. In addition,
In FIG. 3, the range is changed in the first pen unit because the calibration plate is inserted at each change point.

As shown in FIG. 2, for example, when aging is used for measuring hot-rolled steel sheets, the tube voltage is raised to 140 KV, then lowered to 100 KV and held. , 120 KV, and then lowered to 60 KV and held. In the series of processes, when an abnormality occurs, the number is displayed on the operation display unit 7 in accordance with a criterion that is coded in advance for each type of abnormality and classified as, for example, a two-digit number. indicate. Also, depending on the type of abnormality, the power is turned off immediately to stop X-ray emission.

As the calibration plates, for example, nine plates having different thicknesses for hot-rolled steel plates and ten plates having different thicknesses for cold-rolled steel plates are prepared. On / off photo switches are provided for each calibration plate. It has a function of checking whether or not the operation according to the command from the calibration plate control unit 6C is performed within one second.
Is displayed. In addition, operation display section 7
Is configured to display various abnormalities separately.

In the conventional example, the old X
About 1 hour to change from X-ray generator to X-ray generator
About 7.5 hours to perform aging and various tests,
It took about 4.7 hours to adjust and certify the non-defective product, for a total of 13.2 hours. In the course of one year, seven units need to be replaced. I was pressed. In addition, one of the devices was found to be defective as a result of an aging test. Therefore, according to the method of the present invention, 52.5 hours per year (7.5
× 7) +8.5 hours (7.5 + 1), the inspection time by the inspector can be reduced. And the X-ray generator is about 1
It is a 25 kg weight, and about 4 workers are required to replace it.
The burden on workers has also been reduced.

[0023]

As described above, according to the present invention, aging and pass / fail judgment are separately made in a dedicated aging apparatus in advance, so that labor saving and pass / fail judgment can be reliably performed. Benefits are brought.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an aging device according to the present invention.

FIG. 2 is a graph showing an example of an aging pattern.

FIG. 3 is a schematic diagram of a chart showing a recording mode in a recording unit.

[Explanation of symbols]

1. X-ray generator (X-ray detector) 2. Drive circuit, 3.
Detector, 4 calibration plate, 5 input / output device, 6 arithmetic control unit, 7 operation display unit, 8 recording unit

Claims (1)

(57) [Claims] 1. A method for measuring the thickness of a steel sheet in a rolling plant.
An aging method for judging the quality of the X-ray generator by gradually increasing the voltage applied to the X-ray tube of the X-ray generator attached to the line thickness gauge, comprising: Separately from wire thickness gauge
And an X-ray detector is provided opposite to the X-ray generator,
The tube voltage is increased stepwise with respect to the X-ray generator.
The tube voltage of the X-ray generator is automatically changed according to an aging pattern set in advance according to the thickness of the steel sheet, and the correlation between the applied tube voltage in the tube voltage change process and the voltage detected by the X-ray detector. The quality of the X-ray generator
A method for aging an X-ray generator, wherein the aging is performed automatically .