JPS641722B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluorescent X-ray film thickness measuring device, and more particularly to a new and improved safety device for preventing exposure to X-rays caused by operational errors.

There are various safety devices for this type of device that have been used in the past, but one example is that the shutter does not operate until the sample entrance/exit door is completely closed and the detection microswitch is activated. . Additionally, if the door is opened while the shutter is operating, the shutter is configured to automatically close in conjunction with the door operation, but if the door is opened and the sample is taken in or taken out, the shutter is configured to close automatically. If, for example, the user accidentally operated the shutter with his/her hand, the user would be exposed to X-rays, which was extremely dangerous as there was a possibility that his/her hands would be exposed to radiation.

The purpose of this invention is to provide an extremely effective means to quickly eliminate the above-mentioned drawbacks, especially the switch that detects when the door is completely closed and the shutter when it is closed. The X-ray power supply is equipped with a switch that detects the It is an object of the present invention to obtain a safe configuration of an X-ray film thickness measuring device in which there is no risk of exposure to X-rays due to the power supply to the ray tube being cut off.

The present invention will be explained below with reference to the drawings. Drawing 1
1 is an X-ray tube, and when the device is in use, current is constantly flowing and X-rays are generated. 2 is a shutter block that normally cuts off the X-rays generated from the X-ray tube 1 and irradiates the sample 11 during measurement. rotary solenoid 10
is driven in the direction of arrow A by. Reference numeral 7 designates a micro switch provided on a support plate 7a, which operates a contact lever 7b by a lever 9 when the shutter block 2 is moved to the right in the drawing.
In this state, the X-rays from the X-ray tube 1 are cut off by the shutter block 2.

3 is a nearly box-shaped cover that covers the entire device to prevent exposure to X-rays.
A door 4 for entering and exiting the sample 11 provided on the sample stage 12 is attached to the front part of the cover 3, and when the cover 3 is completely closed, the first and second doors provided on the cover 3 are opened. The contact levers 5a and 6a of the microswitches 5 and 6 are operated, and each switching operation is different so that the first microswitch 5 is in the ON state and the second microswitch 6 is in the OFF state. There is.

Furthermore, a relay device 13 is provided on the support plate 7a.
is provided, and this relay device performs ON/OFF control of the power supply of the X-ray tube 1.

In the above configuration, the case of operating the fluorescent X-ray film thickness measuring device according to the present invention will be described. In normal measurement operation, the door 4 is opened, the sample 11 is set on the stage 12, and the door is opened again. When 4 is closed, the contact of the micro switch 5 is turned ON, and the rotary solenoid 10 becomes energized. When the rotary solenoid 10 is energized in this state, the shutter block 2 is moved via the levers 8 and 9, the sample 11 is irradiated with X-rays via the collimator 2a, and measurement is started. In addition, when the door 4 is open, the contact of the micro switch 6 is ON, and if you accidentally try to operate the shutter by hand, the micro switch 7 will be activated and the contact will turn ON. As a result, the relay device 13 is activated and cuts off the current to the X-ray tube 1, thereby stopping the generation of X-rays.

As described above, according to the present invention, when the door 4 is open, the drive means (rotary solenoid
0), and if you accidentally try to operate the shutter by hand in this condition, the X-ray current will be cut off and there is a risk of X-ray exposure. Not at all,
It is characterized by being extremely effective in terms of safety management.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing a fluorescent X-ray film thickness measuring device according to the present invention, and FIG. 2 is a circuit diagram showing electrical connections of the device. 1 is an X-ray tube, 2 is a shutter block, 2a is a collimator, 3 is a cover, 4 is a door, 5, 6, 7
are micro switches, 5a, 6a, and 7a are contact levers of micro switches 5, 6, and 7, respectively, 8 and 9 are levers, 10 is a rotary solenoid, 11 is a sample, 12 is a stage, and 13 is a relay device. .

Claims (1)

[Claims] 1 X-rays from the X-ray tube installed inside the cover,
A first switch that operates in conjunction with movement of the shutter block, and a front surface of the cover, in which X-ray irradiation is performed on a sample by controlling a shutter block that is movably provided and has an integral collimator. a door provided on the cover so that it can be opened and closed; second and third switches provided on the cover and configured to turn on and off at different timings in conjunction with the opening and closing of the door; and a current to the X-ray tube. and a drive means for operating the shutter block, and when the door is closed, the drive means and the shutter block are operated by the operation of the second and third switches and the relay device. A fluorescent X-ray film thickness meter characterized in that the power to the X-ray tube is maintained in an OFF state.