JPH04256805A - Radiation measuring instrument - Google Patents

Abstract

PURPOSE:To facilitate the manual movement of a shutter by coupling a recessed joint with the protruding end of a shutter driving shaft, opening and closing the shutter, and providing a cap on the cover of a radiation source container corresponding to the upper part of the rotary shaft of a rotary actuator. CONSTITUTION:A rotary actuator 10 is fixed to an attaching stage 11 with screws. A screw head for driver action is provided at the head part of a rotary shaft 12. A recessed joint 13 is attached to the lower part of the shaft end. The upper end of a shutter shaft 14 is formed in a protruding shape and coupled with the joint 13. The actuator 10 is usually opened and closed electrically. The shutter 15 is rotated by 45 deg. and positioned at the upper part of a container 1 of a radiation source 2. Thus, the radiation is shielded. When the shutter 15 fails when the shutter 15 is in the opened state, the cap provided on the cover is removed. The screw head of the head part of the rotary shaft 12 is rotated with a driver until the shutter 15 comes into contact with a stopper. Thus, the shutter 15 is closed.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation source shutter of a radiation source container in a radiation measuring instrument.

0002

2. Description of the Related Art Generally, as a device for measuring the thickness of an object, a radiation measuring instrument is used, which has the advantage of being able to measure the thickness without contacting the object. A radiation thickness measuring device will be explained using a conventional example shown in FIGS. 4 and 5. A radiation source 2 contained in a container 1, a shutter 4 for opening and closing the radiation source 2 by a rotary actuator 3, and the like are housed in a radiation source container 5.

The shutter 4 of the radiation source is a rotary actuator 3
The shutter 4 is attached to the head of the radiation source via an arm, and driven by the rotary actuator 3, rotates 45 degrees to open and close the upper part of the radiation source container 1. A manual shutter 6 is provided at the bottom of the shutter 4 and is connected to a manual shutter handle 7, which projects to the outside of the radiation source container 5. With the above configuration, the radiation measuring instrument uses the rotary actuator 3 to rotate the shutter 4 by 45 degrees to close the upper part of the container 1 of the radiation source 2, thereby blocking radiation.

[0004] When the shutter 4 breaks down or the drive system is replaced, the manual shutter 6 is closed by operating the manual shutter handle 7 that protrudes outside the radiation source container 5.

[0005]

Recently, radiation measuring instruments have been increasingly used in confined spaces or in places where they are easily contaminated.

However, since the manual shutter handle protrudes outside the radiation source container, water, oil, etc. may enter the radiation source container through the gap in the manual shutter handle, or scale, etc. may enter the gap. The shutter may stop working. Furthermore, since two shutters, one electric and one manual, are housed in the radiation source container, the container and mechanism are complicated, and the work required for replacement is also complicated. In view of the above, an object of the present invention is to provide a shutter whose shutter function can be operated electrically and manually using a single shutter mechanism. [Structure of the invention]

[0007]

[Means for Solving the Problems] The upper end of the rotary shaft of the rotary actuator is formed into a screw head shape, the lower end thereof is formed into a concave joint, and the end of the drive shaft of the shutter is formed into a convex shape. A cap is fitted to the end of the rotating shaft and is provided on the radiation source container cover above the rotating shaft of the rotary actuator.

[0008]

[Operation] Normally, the shutter is electrically opened and closed by a rotary actuator. If the shutter remains open due to a malfunction, manually close it.

[0009] For manual operation, remove the cap provided on the cover of the radiation source container, use a screwdriver to turn the screw head on the rotating shaft head of the rotary actuator, and rotate the shutter until it hits the stopper to close it. If necessary, attach the stopper B and fix the shutter in the closed state, then remove the rotary actuator from the concave joint and replace it.

0010

Embodiments The present invention will be explained based on embodiments shown in FIGS. 1 to 3.

The container 1 containing the radiation source 2 and the shutter mechanism section 8 are housed in the bottom of the radiation source container 5, and the cover 9 is attached. The rotary actuator 10 is fixed to a mounting base 11 with screws, a screw head for driver operation is provided on the head of the rotating shaft 12, and a concave joint 13 is attached to the lower part of the shaft end.

A shutter 15 and a shutter support 16 are attached to the shutter shaft 14. The upper shaft end of the shutter shaft 14 is formed into a convex shape and is fitted into the concave joint 13, and the lower shaft end is fixed via a bearing 17 to a housing 18 fixed to the bottom of the radiation source container. A removable cap 19 on the cover 9 of the source container at a location corresponding to the rotary actuator shaft 12
will be established.

With the above configuration, the rotary actuator 10 normally opens and closes electrically, and the shutter 15
degree and is positioned above the container 1 of the radiation source 2 to shield radiation. When the shutter 15 fails and the shutter is in an open state, the shutter is manually closed.

To manually operate the shutter 15, remove the cap 19 provided on the cover 9, turn the screw head of the rotary actuator shaft 12 with a screwdriver, and open the shutter 15.
The shutter 15 is rotated until it touches the stopper 20, and the shutter 15 is closed.

If necessary, next, the cover 9 is removed and the stopper 21 is attached to the top surface of the container 2 to fix the shutter 15, and the rotary actuator 10 is removed and replaced. As mentioned above, since the shutter 15 and the rotary actuator 10 are housed in the radiation source container 2, and the shutter can be opened and closed both electrically and manually, the shutter mechanism has a simple structure and its operability is improved. do. moreover,
By stopping the conventional manual shutter handle 7 and housing the entire shutter mechanism 8 in the radiation source container 5, it is possible to prevent dust and the like from entering from the outside.

[0016]

According to the present invention, manual operation of the shutter is facilitated, and the intrusion of foreign substances such as water, oil, and dust from the outside can be prevented, so that use in environments with adverse conditions is facilitated.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a radiation measuring instrument according to the present invention.

FIG. 2 is a view taken along the line II-II in FIG. 1;

FIG. 3 is a detailed view of a portion of FIG. 2;

FIG. 4 is a view taken along the line V-V in FIG. 5;

FIG. 5 is a plan view of a conventional radiation measuring instrument.

[Explanation of symbols]

2...Radiation source 3
, 10...Rotary actuator 4, 15...Shutter 5...Radiation source container 6...Manual shutter 9...Radiation source container cover 11...Shutter shaft 1
3...Concave joint 19...Cap

Claims (1)

[Claims] 1. A radiation measuring instrument comprising a radiation source and a shutter that opens and closes the radiation source using a rotary actuator in a radiation source container, the upper end of the rotary shaft of the rotary actuator protruding in the shape of a screw head, Its lower end is formed into a concave joint, and this concave joint is fitted with the convex shaft end of the drive shaft of the shutter to open and close the shutter, and a cap is attached to the radiation source container cover corresponding above the rotation axis of the rotary actuator. A radiation measuring instrument characterized by being provided with.