A device for eliminating the blind area of radiographic inspection of the beveled end of a metal pipe

Abstract

The utility model relates to nondestructive testing ray detection device's technical field, it discloses a device for eliminating the device that bevel metal round pipe pipe end ray detection blind area includes clamping groove, fixed bolt, compensation extension metal block and locking structure, the locking structure is installed in one end of clamping groove, the other end of clamping groove is connected with compensation extension metal block through fixed bolt, clamping groove distributes at both ends of compensation extension metal block, compensation extension metal block is equipped with the bevel face that coincides with the pipe end of metal round pipe, the material of compensation extension metal block is same with the material of metal round pipe. The utility model can make the pipe end bevel ray detection wall thickness of metal round pipe even, eliminated the edge erosion effect of bevel face ray detection, eliminated the pipe end detection blind area of metal round pipe, reduced the risk of metal round pipe's missed detection.

Description

Technical Field

[0001] This utility model relates to the technical field of non-destructive testing X-ray inspection devices, and in particular to a device for eliminating blind spots in X-ray inspection of beveled metal round tube ends. Background Technology

[0002] Welded metal round pipes are mainly used in oil and gas pipelines. According to standards such as GB / T9711, API 5L, and ISO3183 for oil and gas pipeline transportation systems, the pipe ends need to be beveled at the pipe factory for easy on-site installation and connection. Radiographic inspection is performed after the bevel is machined. However, at the beveled area, the thickness difference along the X-ray beam affects the contrast. Simultaneously, scattered rays from the edge of the metal round pipe cause edge erosion, creating a blind zone of approximately 5mm at the pipe end. Ultrasonic testing cannot penetrate this area, and magnetic particle testing, due to its working principle, can typically only detect defects up to 2mm deep from the surface, also creating a blind zone. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a device for eliminating blind spots in X-ray inspection of the ends of beveled metal round tubes.

[0004] The purpose of this utility model is achieved through the following technical solution: A device for eliminating blind spots in X-ray inspection of the end of a beveled metal tube includes a slot, a fixing bolt, a compensating extension metal block, and a locking structure. The locking structure is installed at one end of the slot, and the other end of the slot is connected to the compensating extension metal block through the fixing bolt. The slots are distributed at both ends of the compensating extension metal block. The compensating extension metal block has a bevel surface that matches the end of the metal tube, and the material of the compensating extension metal block is the same as that of the metal tube.

[0005] Preferably, the locking structure includes a clamping handle and a rotating fixing pin, the rotating fixing pin being rotatably connected to one end of the slot, and the end of the clamping handle passing through the slot being connected to the rotating fixing pin.

[0006] Preferably, the cross-section of the pressure fixing pin is elliptical.

[0007] Preferably, the slot includes an upper pressure plate and a lower pressure plate, one end of the fixing bolt is connected to the upper pressure plate, and the other end of the fixing bolt passes through the compensating extension metal block and is connected to the lower pressure plate, with the upper pressure plate corresponding to the lower pressure plate.

[0008] Preferably, the length of the compensating extension metal block is 20 mm.

[0009] Preferably, the cross-section of the compensating extension metal block is arc-shaped.

[0010] Preferably, the compensating extension metal block is made of iron.

[0011] This utility model has the following advantages and beneficial effects compared to the prior art:

[0012] This invention, through a slot, fixing bolt, compensating extension metal block, and locking structure, enables uniform wall thickness of the bevel of a metal round tube during X-ray inspection, eliminates the edge erosion effect of X-ray inspection of the bevel surface, eliminates blind spots in the inspection of the tube end of the metal round tube, and reduces the risk of missed inspection of the metal round tube. Attached Figure Description

[0013] Figure 1 This is a side view of a device for eliminating blind spots in X-ray inspection of the ends of beveled metal round tubes according to this utility model;

[0014] Figure 2 This is a front view of a device for eliminating blind spots in X-ray inspection of the ends of beveled metal round tubes according to this utility model;

[0015] Figure 3 This is a top view of a device for eliminating blind spots in X-ray inspection of the ends of beveled metal round tubes according to this utility model;

[0016] Figure 4 This is a side view of a device (installation process) for eliminating blind spots in X-ray inspection of the ends of beveled metal round tubes according to this utility model.

[0017] Figure 5 This is a front view of a device (installation process) for eliminating blind spots in X-ray inspection of the ends of beveled metal round tubes according to this utility model.

[0018] Figure 6 This is a top view of the device (installation process) for eliminating blind spots in X-ray inspection of the ends of beveled metal round tubes according to this utility model;

[0019] Figure 7 This is a schematic diagram of a device for eliminating blind spots in X-ray inspection of beveled metal tube ends (locking process with tube ends) according to this utility model.

[0020] Figure 8 This is a schematic diagram of a device (radio inspection process) for eliminating blind spots in X-ray inspection of the ends of beveled metal round tubes according to this utility model;

[0021] The markings of the components in the attached diagram are as follows: 1-Upper pressure plate; 2-Lower pressure plate; 3-Spinning fixing pin; 4-Pressure handle; 5-Fixing bolt; 6-Compensation extension metal block; 7-Pipe end; 701-Weld; 8-Film; 9-Radiation source. Detailed Implementation

[0022] The utility model objective of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the implementation of this utility model is not limited to the following embodiments.

[0023] like Figures 1-3 As shown, a device for eliminating blind spots in X-ray inspection of beveled metal tube ends includes two slots, two fixing bolts 5, a compensating extension metal block 6, and two locking structures. Each slot includes an upper pressure plate 1 and a lower pressure plate 2. Each locking structure includes a clamping handle 4 and a rotating fixing pin 3. Screw holes are provided at both ends of the compensating extension metal block 6, and the two fixing bolts 5 are respectively installed in the two screw holes. The upper end of each fixing bolt 5 is connected to the left end of the upper pressure plate 1, and the lower end of each fixing bolt 5 is connected to the left end of the lower pressure plate 2, with the upper pressure plate 1 and the lower pressure plate 2 corresponding to each other. A through hole is provided at the right end of the upper pressure plate 1, and the two ends of the rotating fixing pin 3 are rotatably installed on both sides of the through hole. The lower end of the clamping handle 4 is fixedly connected to the middle of the rotating fixing pin 3, and the upper end of the clamping handle 4 extends outward through the through hole. The compensation extension metal block 6 has a bevel surface that matches the end 7 of the metal tube, with the bevel surface facing the center of the metal tube.

[0024] The slot is used to install the two ends of the compensation extension metal block 6 onto the pipe ends 7 of the metal round tube (i.e., round steel pipe). The fixing bolts 5 are used to install the two upper pressure plates 1 and the two lower pressure plates 2 onto the two ends of the compensation extension metal block 6. The compensation extension metal block 6 is made of iron, with a length of 20mm. The cross-section of the compensation extension metal block 6 is arc-shaped (the radius of arc of the compensation extension metal block 6 is the same as that of the metal round tube). It is used to compensate for the thickness difference of the pipe ends 7 of the metal round tube, thereby eliminating the scattered rays caused by the bevel of the pipe ends 7 of the metal round tube, increasing the length of the metal round tube to be inspected, thereby eliminating edge corrosion and eliminating the blind zone of X-ray inspection. The locking structure is used to fix the slot onto the pipe ends 7 of the metal round tube. The upper pressure plates 1 and lower pressure plates 2 cooperate with each other to fix the compensation extension metal block 6 onto the pipe ends 7 of the metal round tube; the clamping handle 4 is used to facilitate the user to control the rotation of the rotating fixing pin 3. The cross-section of the pressure fixing pin 3 is elliptical. Through the difference in length between the long and short semi-axis, the long semi-axis increases the pressure between the upper pressure plate 1 and the tube end 7 of the metal tube, thereby achieving locking.

[0025] A method for using an apparatus for eliminating blind spots in X-ray inspection of beveled metal tube ends includes the following steps:

[0026] S1, such as Figures 4-6 As shown, the upper pressure plate 1 is located outside the tube end 7 of the metal round tube, and the lower pressure plate 2 is located inside the tube end 7 of the metal round tube. The weld 701 of the metal round tube is located between the two upper pressure plates 1. Figure 7As shown, when the bevel surface of the compensation extension metal block 6 is fully fitted with the bevel surface of the tube end 7 of the metal round tube, the clamping handle 4 is rotated counterclockwise (arrow direction), and the long half-axis of the clamping pin 3 abuts against the lower side of the upper pressure plate 1 and the outer wall of the metal round tube, thereby locking the compensation extension metal block 6 and the tube end 7 of the metal round tube.

[0027] S2, such as Figure 8 As shown, the compensating extension metal block 6 is made of the same material as the metal tube, and its thickness should be the same as or similar to that of the metal tube being inspected. The contact surface between the compensating extension metal block 6 and the tube end 7 of the metal tube should match the bevel of the tube end 7 of the metal tube. When the X-ray source 9 transmits X-rays, there is no thickness difference or a very small thickness difference at the bevel surface of the tube end 7, and the inspection weld 701 is extended, eliminating the edge corrosion of the tube end 7 of the metal tube, thereby eliminating the blind zone of X-ray inspection, so that the tube end 7 of the metal tube can be projected onto the film 8, improving the quality of X-ray inspection.

[0028] The above-described specific embodiments are preferred embodiments of this utility model and are not intended to limit this utility model. Any other changes or equivalent substitutions made without departing from the technical solution of this utility model are included within the protection scope of this utility model.

Claims

1. A device for eliminating blind spots in X-ray inspection of beveled metal round tube ends, characterized in that: The device includes a slot, a fixing bolt, a compensating extension metal block, and a locking structure. The locking structure is installed at one end of the slot, and the other end of the slot is connected to the compensating extension metal block via the fixing bolt. The slots are distributed at both ends of the compensating extension metal block. The compensating extension metal block has a bevel surface that matches the end of the metal round tube. The material of the compensating extension metal block is the same as that of the metal round tube.

2. The device for eliminating blind spots in X-ray inspection of beveled metal tube ends according to claim 1, characterized in that: The locking structure includes a clamping handle and a rotating fixing pin. The rotating fixing pin is rotatably connected to one end of the slot, and the end of the clamping handle that passes through the slot is connected to the rotating fixing pin.

3. The device for eliminating blind spots in X-ray inspection of beveled metal tube ends according to claim 2, characterized in that: The cross-section of the pressure fixing pin is elliptical.

4. The device for eliminating blind spots in X-ray inspection of beveled metal tube ends according to claim 1, characterized in that: The slot includes an upper pressure plate and a lower pressure plate. One end of the fixing bolt is connected to the upper pressure plate, and the other end of the fixing bolt passes through the compensating extension metal block and is connected to the lower pressure plate. The upper pressure plate corresponds to the lower pressure plate.

5. The device for eliminating blind spots in X-ray inspection of beveled metal round tube ends according to claim 1, characterized in that: The length of the compensation extension metal block is 20mm.

6. The device for eliminating blind spots in X-ray inspection of beveled metal tube ends according to claim 1, characterized in that: The cross-section of the compensation extension metal block is arc-shaped.

7. The device for eliminating blind spots in X-ray inspection of beveled metal round tube ends according to claim 1, characterized in that: The compensation extension metal block is made of iron.

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