CN101236068A - A X-ray beam central axis indication method and its positioning tool nesting ring - Google Patents

Abstract

The present invention discloses a new method for indicating the central axis of an X-ray beam for nondestructive testing. The method uses a special tool, namely a positioning tool nesting ring, to pre-position the central axis of the X-ray beam and then position the adjustable laser indicator by transfer. This positioning method is not only simple to operate, but also accurate in positioning, and can be widely used in indicating the central axis of various accelerator X-ray beams.

Description

A X-ray beam central axis indication method and its positioning tool nesting ring

technical field

The invention belongs to the technical field of accelerator non-destructive testing, and in particular relates to a new method for indicating the central axis of an X-ray beam used for non-destructive testing, and a special tool used in the method.

Background technique

The use of X-ray projection imaging is widely used as an important means of non-destructive testing and industrial flaw detection. X-rays pass through the inspected workpiece to make it image on the film. The key parts of the inspected workpiece and the center of the film should be in the center of the X-ray. On the axis, the X-ray dose rate is the largest here. There are many ways to determine the central axis of the X-ray beam. The usual method is to measure the X-ray dose rate to determine the central axis of the X-ray. However, this method is cumbersome to operate and difficult to locate accurately.

Contents of the invention

The invention aims at the problems existing in the existing X-ray central axis positioning technology, and provides a convenient positioning method and a special tool used therein.

The method for indicating the central axis of the X-ray beam provided by the present invention uses a special tool, that is, the nesting ring of the positioning tool, which is a ring-shaped cylinder with a built-in laser, and its outer diameter is consistent with the inner diameter of the exit hole of the acceleration tube, and the inner diameter is larger than the laser outside diameter. There is a cable hole at the tail, and a set of adjustment screw holes at the front and back, and the position of the laser can be adjusted by adjusting the screws.

A method for indicating the central axis of an X-ray beam. After the central axis of the X-ray beam is pre-positioned, an adjustable laser pointer is positioned. Crucially, the prepositioning of the central axis of the X-ray beam consists of two steps:

Step 1, positioning tooling nesting ring centering. Put the laser into the nesting ring of the positioning tool and turn on the power to make it emit light. The laser beam is aligned with a vertical plane, and then the nesting ring of the positioning tool is rotated along its central axis, and the laser point is kept in rotation by adjusting the screw. constant.

Step 2, the central axis of the X-ray beam is pre-positioned. Insert the nesting ring of the positioning tool adjusted in step 1 into the exit hole of the acceleration tube, turn on the power to make the laser emit light, and adjust the two vertical light targets through the beam so that their centers are on the laser axis.

The operation method for positioning the adjustable laser pointer is: adjust the fixing screw of the adjustable laser pointer so that the laser light perpendicular to the central axis of the X-ray beam is reflected at 45 degrees and passes through the centers of the two vertical light targets.

The present invention realizes the positioning of the central axis of the X-ray beam by using the special tool for the nesting ring of the positioning tool and through transmission.

Description of drawings

Fig. 1 is the front view of the nesting ring of the positioning tool;

Fig. 2 is a left view of the nesting ring of the positioning tool;

Fig. 3 is a schematic diagram of a method for indicating the central axis of an X-ray beam.

Among them, 1. Nesting ring of positioning tooling; 2. Cable hole; 3. Rear adjustment screw hole; 4. Front adjustment screw hole; 5. Laser; 6. X-ray target; 7. Adjustable laser pointer; 8. Reflection mirror; 9, laser beam; 10, vertical light target 1; 11, vertical light target 2.

Detailed ways

The technical solution of the present invention will be further elaborated below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, the nesting ring 1 of the positioning tool is a special tool used in a method of indicating the central axis of an X-ray beam. The tooling is a ring-shaped cylinder with a built-in laser 5 whose outer diameter is consistent with the inner diameter of the exit hole of the acceleration tube and slightly larger than the outer diameter of the laser 5 to ensure that the position of the laser 5 can be adjusted. There is a cable hole 2 at its tail, and the cable passing through the hole provides power for the laser 5 . A set of adjustment screw holes 3 and 4 are respectively provided before and after the nesting ring 1 of the positioning tool. In this embodiment, each set is designed with 3 holes, which are evenly distributed at 120 degrees. Rotate the screws to adjust the position of the laser device 5 .

The method of determining the central axis of the X-ray beam is as follows:

a. Center the nesting ring 1 of the positioning tooling. Put the laser 5 into the processed positioning tool nesting ring 1, connect the power supply to make it glow, then install the positioning tool nesting ring 1 on the lathe chuck with better precision, and align the laser 10 meters away Turn the lathe chuck on a vertical plane, adjust the side screw of the nesting ring 1 of the positioning tool, so that the laser point remains unchanged during the rotation, indicating that the laser 5 is coaxial with the nesting ring 1 of the positioning tool. After the adjustment is completed, remove the nesting ring 1 of the positioning tool, and fix the screws on the nesting ring 1 of the positioning tool with fixing glue.

b. Pre-positioning of the central axis of the X-ray beam. Remove the collimation cone of the exit hole of the acceleration tube, insert the positioning tooling nesting ring 1 into the exit hole of the acceleration tube, connect the power supply to make the laser 5 emit light, and adjust the vertical light target 10 at 5 meters and the vertical position at 10 meters through the beam. The light targets 11 make their centers on the laser axis, and rotate the nesting ring 1 of the positioning tool to ensure that the position of the laser beam on the vertical light targets 10 and 11 remains unchanged. Vertical light target 10,11 is the transparent glass target with scale, is placed on the support and can adjust the position up and down, left and right. Keep the accelerator and the vertical light targets 10, 11 still after the adjustment is completed. Remove the nesting ring 1 of the positioning tool, and install the collimation cone, ionization chamber, etc.

c. Adjustable laser pointer positioning. As shown in Figure 3, the adjustable laser pointer 7 is installed, and the power is turned on to make it emit laser light 9. The laser light 9 is reflected by the 45-degree reflector 8 and aligned with the vertical light targets 10, 11. By adjusting the laser pointer 7 Fix the screw so that the laser beam 9 passes through the center of the vertical light target 10,11. Fix and adjust the fixing screw of the laser pointer 7 to complete the positioning installation.

When in use, after the laser light 9 emitted by the adjustable laser pointer 7 is reflected by the 45-degree reflector 8, it is aimed at the key part of the workpiece to be inspected, and the central axis of the X-ray beam emitted by the X-ray target 6 is aligned with the object to be inspected. The key part of the workpiece.

Claims (7)

1. A method for indicating the central axis of the X-ray beam is to position the adjustable laser pointer (7) after the central axis of the X-ray beam is pre-positioned, characterized in that: the pre-positioning process of the central axis of the X-ray beam consists of two steps, Step 1. Align the nesting ring (1) of the positioning tool, that is, put the laser (5) into the nesting ring (1) of the positioning tool and turn on the power to make it emit light. The beam of light is aligned with a vertical plane, and then nest the positioning tool The ring (1) rotates along its central axis, and by adjusting the screw, the laser spot remains unchanged during the rotation; Step 2, pre-positioning the central axis of the X-ray beam, inserting the nesting ring (1) of the positioning tool adjusted in step 1 into the exit hole of the acceleration tube, turning on the power to make the laser emit light, and adjusting two vertical light targets (10, 11), so that their centers are on the laser axis. 2. The X-ray beam central axis indicating method according to claim 1, characterized in that: the adjustable laser pointer (7) positioning operation method is to adjust the adjustable laser pointer (7) and fix it so that it The emitted laser light (9) perpendicular to the central axis of the X-ray beam is reflected at 45 degrees and passes through the centers of the two vertical light targets (10, 11). 3. The X-ray beam central axis indicating method according to claim 1, characterized in that: after the centering of the nesting ring (1) of the positioning tool is completed, the screws on the nesting ring (1) of the positioning tool are used The fixing glue is fixed. 4. The X-ray beam central axis indicating method according to claim 1, characterized in that: said vertical light targets (10, 11) are transparent glass targets with scales. 5. implement a kind of special-purpose tool of X-ray beam central axis indication method described in claim 1, be the nesting ring (1) of positioning frock, it is ring-shaped cylinder, built-in laser (5), its outer diameter and acceleration The inner diameters of the tube outlet holes are the same, and the inner diameter is larger than the outer diameter of the laser (5); a group of adjusting screw holes (3, 4) are respectively arranged at the front and rear. 6. The positioning tool nesting ring 1 according to claim 5, characterized in that: each group of 3 said adjusting screw holes (3, 4) is evenly distributed at 120 degrees. 7. The positioning tool nesting ring 1 according to claim 5, characterized in that: a cable hole (2) is opened at the tail of the positioning tool nesting ring (1).

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