Centering device and centering method for ring joint radiographic testing of header

Abstract

A kind of header ring seam radiographic testing center alignment device and alignment method.The conventional technology adopts double-wall single shadow to carry out transmission, needs to be placed source multiple times, and the imaging effect is not good for moving radiation source each time, waste time and increase cost in this way.This application composition includes:its composition includes: observation hole (1), observation hole is four diameters 50mm round hole in a disc relative symmetry, disc center and height positioning device (2) are connected by an intermediate strut, height positioning device includes conical head (3), conical head is connected with rotatable screw (4) by welding, center positioning device (8) is fixed in the center of strut by a diameter 35mm hollow ring, two side fixing device (5) includes two telescopic steel bars (6), telescopic steel bar is welded and fixed with rotating bolt disc (7), and the length of telescopic steel bar is adjusted under the rotation of rotating bolt disc.The present application is used for header ring seam radiographic testing center alignment device.

Description

Technical Field

[0001] This invention relates to the field of industrial non-destructive testing radiographic testing technology, specifically to a center alignment device and method for radiographic testing of circumferential seams in headers. Background Technology

[0002] In actual industrial X-ray inspection, the circumferential seam at the end cover of the small header needs to be inspected. However, center alignment is difficult during the inspection process because the source guide tube is relatively soft and there is no support in the center. The circumferential seam of the end cover is also a certain distance from the manhole. Accurate alignment of the center of the circumferential seam during the X-ray inspection process is particularly important for center exposure inspection.

[0003] Traditional radiographic inspection of header circumferential welds often involves double-wall single-image imaging when center alignment is not possible. This method requires multiple source placements, 8-10 times per header. Not only does each exposure necessitate moving the X-ray source, but the resulting uneven film coverage leads to poor image quality. This is both time-consuming and costly. Center alignment, on the other hand, allows for a single, uniform imaging of the entire weld seam, meeting inspection standards while significantly improving efficiency. Therefore, center alignment inspection of header circumferential welds is crucial for both weld quality and efficiency.

[0004] X-ray inspection of the circumferential seam of the header end cap, with center alignment, improves both the quality and efficiency of the film. Therefore, finding a center alignment device that can perform alignment very simply and conveniently, and that can be removed and reused after alignment, and that the positioning device can be adjusted according to the size of headers with different inner diameters, would greatly help improve inspection efficiency and economic benefits. Finding a convenient, practical, and accurate center-positioning X-ray inspection device is of great application significance. Summary of the Invention

[0005] The purpose of this invention is to provide a center alignment device and method for radiographic inspection of circumferential weld seams in a header. This structure and method enable the center alignment device to inspect the entire weld seam with a single radiographic exposure. The center radiographic positioning device is convenient and simple to use, saving time and costs.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A center alignment device for X-ray inspection of circumferential seams in a container comprises: observation holes, which are four symmetrical circular holes with a diameter of 50 mm on a disc; a central support rod connecting the disc and a height positioning device; a conical head for the height positioning device, which is welded to a rotatable screw; a center positioning device fixed to the center of the support rod by a hollow ring with a diameter of 35 mm; and two telescopic steel bars for fixing on both sides, which are welded to a rotating bolt disc and whose length is adjusted by the rotation of the bolt disc. The hollow ring is welded to the support rod for center positioning.

[0008] A center alignment device and method for X-ray inspection of header circumferential seams, the method comprising the following steps:

[0009] Firstly, in actual flaw detection, when the circumferential seam of the header needs to be centered for X-ray inspection, the inner diameter of the header can be measured and the height positioning device adjusted so that the length of the conical head on the height positioning device and the rotating bolt disc is exactly the inner diameter of the header.

[0010] Place the header circumferential seam X-ray inspection center positioning device into the header, observe through the observation hole that the conical head and the two telescopic steel bars on the two side fixing devices are fixed on the inner wall of the header, then rotate the bolt plate to fix the entire device, and push the entire device to the header circumferential seam position.

[0011] After the entire device is pushed to the position of the header circumferential seam, the source guide tube is inserted through the observation hole of the header end cover. Then, the source guide tube is sent into the header circumferential seam X-ray detection center alignment device through the manhole in the middle of the header. In this way, the source is in the center of the entire inner wall of the header. The center alignment is completed. Then, the source is released to detect the header circumferential seam. After the detection, the X-ray source guide tube is pulled out from the header observation hole, and the header circumferential seam center alignment device is taken out through the manhole.

[0012] Adjust the rotatable screw according to the inner diameter of the header so that the conical head rests on the inner wall of the header. Observe the two telescopic steel bars on the two fixed devices through the observation hole. Rotate the bolt disc to control the two telescopic steel bars to rest on the inner wall for fixation. Then push the entire positioning device to the front section of the header circumferential seam. Insert the X-ray source guide tube into the observation hole to perform X-ray detection and expose the center.

[0013] After the X-ray inspection is completed, remove the X-ray inspection center alignment device for the circumferential seam of the header, adjust the rotating bolt disc to retract the two retractable steel bars, thus removing the fixing devices on both sides. Then rotate the rotatable screw to retract the conical head, which will shorten the height positioning device. Remove the entire positioning device, and repeat the above steps for the next use. Beneficial effects

[0014] 1. The present invention allows the header circumferential seam X-ray inspection center positioning device to be fixed inside the header after being adjusted according to the inner diameter of the header. The source guide tube only needs to be directly inserted into the central ring to complete the center positioning process. This innovative device can complete the center positioning activity that traditional technology cannot. This operation is simple, accurate and highly applicable.

[0015] 2. This invention allows the positioning device to be placed directly into the header during use and removed when not in use, which is convenient and environmentally friendly. The resulting film has uniform blackness, and the entire circumferential seam can be inspected in a single exposure. The header circumferential seam center positioning device can directly locate the center, saving inspection time, improving economic efficiency, and freeing up labor.

[0016] 3. Compared with traditional X-ray inspection of header circumferential welds using double-wall single-image radiography, which requires multiple exposures and alignments, this invention uses a central alignment device to inspect the entire weld with a single exposure. The central radiography positioning device is convenient and simple to use. It can be adjusted according to the inner diameter of the header to keep the central hollow ring at the center of the support rod. In this way, when the source guide tube enters the central positioning device, the X-ray source is at the exact center of the header. This alignment method is accurate and convenient, without errors, and there is no situation where the center positioning is inaccurate due to measurement.

[0017] 4. The alignment device for radiographic testing of the circumferential seam of the present invention saves the alignment time of radiographic testing personnel and improves the accuracy of positioning, which is of great benefit both economically and in ensuring welding quality. Attached Figure Description

[0018] Appendix Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Appendix Figure 2 It is attached Figure 1 Top view.

[0020] The components include: 1. observation hole, 2. height positioning device, 3. conical head, 4. rotatable screw, 5. two-sided fixing device, 6. telescopic steel bar, 7. rotating bolt disc, 8. center positioning device, and 9. hollow ring. Detailed Implementation

[0021] Example 1:

[0022] A header circumferential seam X-ray inspection center alignment device, comprising: a header circumferential seam X-ray inspection center positioning device consisting of four 50mm diameter circular holes arranged opposite each other on a disc as observation holes 1; a conical head 3 and a rotatable screw 4 forming a height positioning device 2; two retractable steel bars 6 and a rotating bolt disc 7 forming a two-sided fixing device 5; and a center positioning device 8 consisting of a 35mm diameter hollow ring 9 fixed to the center of the support rod.

[0023] In the actual X-ray inspection process, adjust the rotatable screw 4 according to the inner diameter of the header so that the conical head 3 is pressed against the inner wall of the header. Observe the two telescopic steel bars 6 on the two side fixing devices 5 through the observation hole 1. Rotate the bolt disc 7 to control the two telescopic steel bars 6 to be pressed against the inner wall for fixation. Then push the entire positioning device to the front section of the header circumferential seam and insert the X-ray source guide tube into the observation hole to carry out X-ray inspection. Exposure is then performed at the center.

[0024] After the X-ray inspection is completed, remove the X-ray inspection center alignment device for the circumferential seam of the header, adjust the rotating bolt disc 7 to retract the two retractable steel bars 6, thus removing the fixing devices 5 on both sides. Then rotate the rotatable screw 4 to retract the conical head 3, which will shorten the height positioning device 2. Remove the entire positioning device. Repeat the above steps for the next use.

[0025] This application designs a header circumferential seam center alignment device, which achieves center positioning through several components. In time-lapse X-ray inspection, after measuring the inner diameter of the header, the height of the alignment device is adjusted according to the inner diameter of the header. The rotatable screw on the positioning device is adjusted so that the length from the upper end of the conical head to the lower end of the rotating bolt disc is exactly equal to the inner diameter of the header. Then, with the conical head pointing downwards and the rotating bolt disc pointing upwards, it is inserted through the manhole in the middle section of the header. Then, it is checked through the four observation holes at the top to see if it is fixed. The bolt disc is rotated so that the two retractable steel bars at both ends are stuck on the inner wall. In this way, the 35mm diameter hollow ring of the center positioning device is exactly located in the center of the header. Then, the header center alignment device is pushed to the front of the header end cover circumferential seam. During X-ray inspection, the source guide tube is inserted into the header through the observation hole on the header end cover, and then inserted into the center positioning device through the header manhole. After the X-ray source is released, the entire circumferential seam is exposed in one pass.

Claims

1. A method for aligning a center alignment device for radiographic testing of header circumferential seams, characterized in that: The aforementioned box circumferential seam X-ray inspection center alignment device includes: observation holes, which are four symmetrical circular holes with a diameter of 50mm on a disc; the center of the disc and the height positioning device are connected by a central support rod; the height positioning device includes a conical head, which is welded to a rotatable screw; the center positioning device is fixed to the center of the support rod by a hollow ring with a diameter of 35mm; the two side fixing devices include two telescopic steel bars, which are welded to a rotating bolt disc and the length of the telescopic steel bars is adjusted by the rotation of the rotating bolt disc; the hollow ring is welded to the support rod for center positioning. The method includes the following steps: Firstly, in actual flaw detection, when the radiographic inspection of the header circumferential seam requires center positioning, after measuring the inner diameter of the header, the height positioning device is adjusted so that the length from the upper end of the conical head on the height positioning device to the lower end of the rotating bolt disc is exactly equal to the inner diameter of the header. Place the header circumferential seam X-ray inspection center positioning device into the header, observe through the observation hole that the conical head and the two telescopic steel bars on the two side fixing devices are fixed on the inner wall of the header, then rotate the bolt plate to fix the entire device, and push the entire device to the header circumferential seam position. After the entire device is pushed to the position of the header circumferential seam, the source guide tube is inserted through the observation hole of the header end cover. Then, the source guide tube is sent into the header circumferential seam X-ray detection center alignment device through the manhole in the middle of the header. The source is centered on the inner wall of the entire header. Once the center alignment is completed, the source is released and the header circumferential seam is inspected. After the inspection, the X-ray source guide tube is pulled out from the header observation hole, and then the header circumferential seam center alignment device is taken out through the manhole. Adjust the rotatable screw according to the inner diameter of the header so that the conical head rests on the inner wall of the header. Observe the two telescopic steel bars on the two fixed devices through the observation hole. Rotate the bolt disc to control the two telescopic steel bars to rest on the inner wall for fixation. Then push the entire positioning device to the front section of the header circumferential seam, insert the X-ray source guide tube into the observation hole for X-ray detection, and expose the center. After the X-ray inspection is completed, remove the X-ray inspection center alignment device for the circumferential seam of the header, adjust the rotating bolt disc to retract the two retractable steel bars, remove the fixing devices on both sides, then rotate the rotatable screw to retract the conical head, shorten the height positioning device, and remove the entire positioning device.

Images