阅读说明：本技术 伽玛射线准直定位装置 (Gamma ray collimation positioner ) 是由 潘磊 于 2020-04-22 设计创作，主要内容包括：本专利申请提供的伽玛射线准直定位装置,其组成包括定向准直器、移动平台和激光发射器,其中激光投射轨迹方向与定向准直器射线同向、且处于射线轴线的纵向投影线上。本技术方案大大提高了准直器放射中心与被检区域中心对中调整作业效率,且调整作业流程简洁、易操作,省时、省力、高效。(The gamma ray collimation positioner that this patent application provided, its constitution includes directional collimator, moving platform and laser emitter, and wherein the laser throws the orbit direction and directional collimator ray syntropy, and be in on the longitudinal projection line of ray axis. The technical scheme greatly improves the centering adjustment operation efficiency of the radiation center of the collimator and the center of the detected area, and the adjustment operation flow is simple, easy to operate, time-saving, labor-saving and efficient.)

1. A gamma ray collimation positioning device comprises a directional collimator (5) and a moving platform (1) supporting and mounting the directional collimator, and is characterized in that a laser emitter (4) is further mounted on the moving platform (1), and the laser projection track direction of the laser emitter (4) is in the same direction as the ray of the directional collimator and is positioned on the longitudinal projection line of a ray axis (16).

2. A gamma ray collimation fixture as claimed in claim 1, characterized in that the mobile platform (1) is provided with universal wheels (22) with locking means.

3. A gamma ray collimation positioning device as claimed in claim 1, wherein the laser emitter (4) is a laser pen.

4. A gamma ray collimation positioning device as claimed in claim 1, wherein the laser projection trajectory intersects the directional collimator ray axis (16) at the radiation focus of the radiation source.

5. A gamma ray collimation positioning device as claimed in claim 1, wherein the two sides of the directional collimator (5) are provided with the same focus calibration rod assembly, the focus calibration rod assembly comprises a slide rod sleeve (2), a focus calibration rod (3) and a calibration rod locking button (7) which are in sliding fit with the slide rod sleeve (2), and the two focus calibration rods (3) are arranged in parallel with the ray axis (16) of the directional collimator.

Technical Field

The patent application relates to a collimator of a radioactive ray nondestructive inspection device, in particular to a device for assisting the collimator to finish centering adjustment before flaw detection.

Background

Before the nondestructive inspection operation of gamma rays, different types of gamma ray collimators are required to be selected according to different detection requirements, the collimators are made of shielding materials, radioactive source rays penetrate through collimating channels of the collimators and are projected to a shooting detection area, and the emission direction and the emission angle range of the radioactive ray beams are limited by emission windows of the radioactive source rays.

The radioactive source is sent into the directional collimator by the source guide tube to be used as a radiation center, and during detection operation, the radiation center, the radiation collimator and the central point of a measurement area are adjusted to be on the same straight line to form a three-point and one-line detection system, so that the ray intensity in other angle directions is greatly reduced, the interference of scattered rays on negative film imaging is avoided, meanwhile, the radiation damage of the scattered rays to the surrounding environment and personnel is avoided, and the safety of gamma ray nondestructive detection is improved.

However, in the detection operation, the radiation center, the radiation collimator and the center of the measurement area are adjusted to form a line to form an ideal detection system, which is difficult to adjust and center, and the phenomena of center deviation and non-perpendicular radiation axis to the photosensitive film are easily generated during the operation, which affects the film-taking effect and has low efficiency of centering adjustment.

Disclosure of Invention

The invention aims to change the technical situation that the existing collimator lacks a collimation centering positioning technical means and causes low adjustment operation efficiency, can quickly and accurately adjust the centering positioning of the gamma-ray collimator, and provides the gamma-ray collimation positioning device.

In view of the above, it is a further object of the present application to ensure that the radiation axis is accurately perpendicular to the photosensitive film without deflection during alignment.

The technical scheme of the gamma ray collimation positioning device provided by the patent application mainly comprises the following technical contents: a gamma ray collimation positioning device comprises a directional collimator and a mobile platform supporting and mounting the directional collimator, wherein a laser emitter is further mounted on the mobile platform, and the laser projection track direction of the laser emitter is in the same direction as the ray of the directional collimator and is positioned on the longitudinal projection line of the ray axis.

In a preferable technical means of the above overall technical scheme, the moving platform is provided with a universal wheel with a locking device.

In a preferred technical means of the above overall technical solution, the laser emitter is a laser pen.

In a preferred technical means of the above overall technical solution, the laser projection trajectory intersects with the ray axis of the directional collimator at the radiation focus of the radiation source.

In order to achieve the second object of the present patent application, the same fixed focus calibration rod assemblies are disposed on two sides of the directional collimator in the technical solution, each fixed focus calibration rod assembly includes a slide rod sleeve, a fixed focus calibration rod and a calibration rod locking button, the fixed focus calibration rods are slidably fitted in the slide rod sleeve, and the two fixed focus calibration rods are disposed parallel to the ray axis of the directional collimator.

The technical scheme of the gamma ray collimation positioning device disclosed by the application is that a laser on a ray axis of a directional collimator is used as a visual reference, so that the centering adjustment operation efficiency of a radiation center and a detected area center of the collimator is greatly improved, and the device is simple in structure, low in modification cost, concise in adjustment operation flow and easy to operate. In addition, the total cost of the fixed-focus calibration rod is matched with the total cost of the fixed-focus calibration rod, the whole set of adjustment operation of centering and focusing before shooting detection can be completed quickly and accurately, and time, labor and efficiency are saved.

Drawings

Fig. 1 and 2 are respectively a front view and a top view of the present patent application.

Fig. 3 is a sectional view of the assembly of the stand height adjusting mechanism.

Fig. 4 is a shot state diagram of the directional collimator.

Fig. 5 is a state diagram of the present patent application for achieving the focusing and centering state.

Detailed Description

The gamma ray collimation positioning device of the present patent application, as shown in the figure, comprises a directional collimator 5, and the directional collimator 5 is carried by the mobile platform 1. The directional collimator 5 is fastened by a clamping strap 20 on top of a stand 21 standing upright on the moving platform 1. The support 21 is a rod body and forms a height adjusting mechanism of the directional collimator 5 by matching with other components. In the height adjusting mechanism, a support 21 is arranged in a pipe barrel 12 in a guiding and sliding mode, the pipe barrel 12 is vertically fixed on a fixing plate 11 in a welding mode, the pipe barrel 12 penetrates through a moving platform 1, the fixing plate 11 is fixed below the moving platform 1 in parallel through a hanging nail 15, a positioning nail 8 penetrates through the upper portion of the pipe barrel 12 in the radial direction, a plurality of height adjusting grooves 13 with the same unit length are formed in the support 21, the support 21 is adjusted to the corresponding height according to actual height requirements, and then the positioning nail 8 is locked into the corresponding height adjusting grooves 13 to complete height adjusting and locking.

The bottom roller of the mobile platform 1 is provided with a universal wheel 22 with a locking device.

The mobile platform of the device is also provided with a laser emitter 4. The laser emitter 4 can be a laser pen. The laser projection trajectory is parallel to the directional collimator ray axis 16 and is on the longitudinal projection line of the directional collimator ray axis 16, as shown in fig. 5.

The alignment adjustment process of the radiation center 17 of the directional collimator and the center of the photosensitive film 32 is as follows: the photosensitive film 32 is adhered to the back of the detected area of the detected plate 31, a vertical positioning line 33 is drawn on the front of the detected plate 31 corresponding to the center of the photosensitive film 12, the laser emitter 4 is started to emit a laser projection track, the moving platform 1 is moved to enable the laser projection track to coincide with the vertical positioning line 33, and the centering operation of the radiation center 17 of the directional collimator and the center of the photosensitive film 32 is completed.

In order to ensure that the ray axis 16 of the directional collimator is always perpendicular to the photosensitive film 32 and does not deflect during other adjustment operations, the same fixed-focus rod assemblies are arranged on two sides of the directional collimator 5. The fixed focus calibration rod assembly comprises a sliding rod sleeve 2, a fixed focus calibration rod 3 and a calibration rod locking button 7, wherein the fixed focus calibration rod 3 and the calibration rod locking button are in sliding fit in the sliding rod sleeve, and the two fixed focus calibration rods 3 are arranged in parallel to the ray axis 16 of the directional collimator. The mark post locking button 7 is a screw button which penetrates through the sliding rod sleeve 2 to lock the focus fixing mark post 3, and the mark post locking piece 7 is preferably arranged on the vertical plane of the radiation center 17. The fixed focus marking rod 3 is provided with length scale marks.

The two sides of the directional collimator 5 are provided with the same fixed focus calibration rod assembly. In the structure of this embodiment, the fixed focus benchmarks assemblies are parallel to each other and respectively disposed on two sides of the moving vehicle body 1, and include a sliding rod sleeve 2, a benchmarking 3 and a benchmarking locking piece 7 slidably engaged in the sliding rod sleeve 2, and the two benchmarking 3 are parallel to the collimator ray axis 16.

The radioactive source is sent into the directional collimator 5 by the source guide tube 9, and can be determined by the sliding-out length of the focus-fixing marking rod 3 according to the shooting focal length, namely the vertical distance between the radiation center 17 and the photosensitive film 32, namely the thickness of the detected plate 31 and the distance between the top end of the focus-fixing marking rod 3 and the marking rod locking button 7. In actual use, the sliding lengths of the two fixed-focus benchmarks 3 are determined by subtracting the thickness of the detected plate 31 and the residual value of the distance value between the front end face 10 of the flat plate 31 and the front surface of the detected plate 31 from the shooting focal length. After the determination, the moving platform 1 is pushed, the top ends of the two fixed-focus calibration rods 3 are touched on the front end face 10 of the flatbed to finish the collimator focusing, the moving vehicle body 1 is pushed along the front end face 10 of the flatbed, the rapid centering adjustment of the ray axis 16 of the directional collimator and the center of the photosensitive film 12 is finished according to the guidance of the laser emitter 4, then the locking device of the universal wheel 22 is locked, the focusing and centering adjustment before the shooting is finished and locked, and the optimal shooting imaging working state is determined. If the front end face 10 of the flatbed is not parallel to the detected plate 31, the sliding length of the focus calibration rod 3 is the residual value of the shot focal length and the thickness of the detected plate 31, a rod section length 14 is led out of the focus calibration rod 3 on the basis, and the top end of the focus calibration rod touches the front face of the detected plate 31.

In the present embodiment, as shown in fig. 4, the direction of the laser projection trajectory intersects with the axis 16 of the directional collimator ray at the focal point of the radiation, and the alignment is determined by the coincidence of the laser projection trajectory and the center of the photosensitive film 32 on the vertical positioning line 33 of the inspected plate 31 and the focus-fixing rod 3, so as to ensure that the axis 16 of the directional collimator ray is always perpendicular to the photosensitive film 32.