Small X-ray flaw detection device with shielding function and flaw detection method

Abstract

The invention relates to the technical field of nuclear power nondestructive testing, in particular to a small X-ray flaw detection device with a shielding function and a flaw detection method.The device comprises a fixing ring, an upper shielding shell, a lower shielding shell, an X-ray machine fixing device and an X-ray machine, the fixing ring is arranged at the upper position of a pipeline welding seam, and a sliding groove is formed in one end of the fixing ring; the upper shielding shell and the lower shielding shell are lapped on the sliding grooves of the fixing ring and can rotate along the sliding grooves of the fixing ring; the outer part of the upper shielding shell is fixedly connected with an X-ray machine fixing device, and an X-ray machine is arranged in the X-ray machine fixing device. The device is small in structure and easy to disassemble and assemble, and the inspection work efficiency is obviously improved. According to the device, rays at the edge of the pipeline are shielded by designing the fixing ring and the shielding ring, meanwhile, the X-ray machine is tightly connected with the detected pipeline and the flaw detection device, and the space needed for detection is small.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power nondestructive testing, and in particular to a small X-ray flaw detection device with a shielding function and a flaw detection method. Background Art

[0002] After approximately 30 years of operation, a CANDU heavy water reactor unit requires the replacement of all core pressure tubes. This includes the replacement of the main heat transfer branch pipes (referred to as feeder pipes) and their connecting components. Following these replacements, regulations and standards require radiographic inspection of over 1,000 welds of varying specifications. X-ray inspection, a traditional radiographic inspection technique, offers high penetration and adjustable energy.

[0003] In existing technologies, the area where the feeder tubes are located is small, with the distance between two adjacent feeder tubes being less than 20 centimeters. The existing X-ray machine is large and cannot be used for operation. In addition, the X-ray machine is heavy and requires an external power supply, which takes a long time to move the equipment and reduces work efficiency. In addition, implementing X-ray flaw detection in an open environment requires the establishment of a large isolation and warning area, which makes it impossible to implement other projects at the same time, thereby significantly increasing the construction period of the pressure tube full core replacement project. Summary of the Invention

[0004] The present invention provides a small X-ray flaw detection device with a shielding function and a flaw detection method, which are used to solve the problem that the X-ray flaw detection device in the prior art is not suitable for narrow pipeline areas and has large ray radiation.

[0005] The technical solutions of the present invention are as follows:

[0006] The present invention proposes a small X-ray flaw detection device with a shielding function, which includes a fixing ring, an upper shielding shell, a lower shielding shell, an X-ray machine fixing device and an X-ray machine. The fixing ring is arranged at the upper position of the pipeline weld, and a sliding groove is provided at one end of the fixing ring; the upper shielding shell and the lower shielding shell are overlapped on the sliding groove of the fixing ring, and the upper shielding shell and the lower shielding shell can rotate along the sliding groove of the fixing ring; the outer portion of the upper shielding shell is fixedly connected to the X-ray machine fixing device, and the X-ray machine is provided inside the X-ray machine fixing device.

[0007] In some embodiments, the upper shielding shell and the lower shielding shell are both hollow semi-cylindrical structures; one end of the upper shielding shell and the lower shielding shell are hingedly connected by a hinge, and the other end is connected by a buckle and locked with a pin.

[0008] In some embodiments, a bolt hole A is provided on the fixing ring, and a device positioning pin is provided in the bolt hole A. The device positioning pin is used to fix the fixing ring on the pipeline.

[0009] In some embodiments, an angle positioning hole is provided on the fixing ring, a protruding structure is provided on the lower shielding shell, a bolt hole B is provided on the protruding structure, and the bolt hole B and the angle positioning hole are penetrated by a rotating positioning pin, which is used to fix the position of the upper shielding shell and the lower shielding shell.

[0010] In some embodiments, shielding rings are installed at the ends of the upper shielding shell and the lower shielding shell that are not connected to the fixing ring, and the shielding rings are used to shield scattered rays inside the device.

[0011] In some embodiments, the X-ray machine fixing device is a hollow semi-cylindrical structure, the semi-cylindrical structure of the X-ray machine fixing device is in contact with the outer surface of the X-ray machine, and the X-ray machine fixing device is provided with a window at the X-ray machine window position, which is used to place the X-ray machine.

[0012] In some embodiments, an X-ray machine connecting pin is provided at the bottom of the X-ray machine fixing device, and a connecting hole is provided at the corresponding position of the X-ray machine. The X-ray machine connecting pin is inserted into the connecting hole, and the X-ray machine connecting pin is used to support and position the X-ray machine.

[0013] In some embodiments, both the device positioning pin and the rotation positioning pin are provided with anti-fall rings, which are used to prevent the device positioning pin and the rotation positioning pin from falling off due to loosening.

[0014] The present invention proposes a small X-ray flaw detection method with a shielding function, which includes:

[0015] Step 1: Install the fixing ring and shielding ring at both ends of the pipe weld;

[0016] Step 2: Install the upper shielding shell and the lower shielding shell in the sliding groove position of the fixing ring, and fix the position of the upper shielding shell and the lower shielding shell by rotating the positioning pin;

[0017] Step 3: Install the X-ray machine in the X-ray machine fixture of the upper shielding housing;

[0018] Step 4: Use X-ray machine to carry out pipeline flaw detection.

[0019] Step 5: Remove the rotating positioning pin, rotate the upper shielding shell and the lower shielding shell, reinsert the rotating positioning pin, and use the X-ray machine to perform pipeline flaw detection from different directions.

[0020] The implementation of the present invention has the following beneficial effects:

[0021] 1. This invention proposes a small-scale X-ray flaw detection device and method with shielding function. The device is compact and easy to assemble and disassemble, significantly improving inspection efficiency. The device shields the pipe edge with fixed and shielding rings. It also provides a tight connection between the X-ray machine, the inspected pipe, and the flaw detection device, minimizing the space required for inspection.

[0022] 2. The present invention proposes a small X-ray flaw detection device and flaw detection method with a shielding function. The device is designed with a positioning pin and a rotating positioning pin, which allows the device to rotate on the pipeline and perform flaw detection on the pipeline in all directions.

[0023] 3. The present invention proposes a small X-ray flaw detection device and flaw detection method with a shielding function. The device is provided with an X-ray machine fixing device to achieve rapid positioning of the X-ray machine and improve detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of a small X-ray flaw detection device with shielding function proposed in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of an X-ray machine of a small X-ray flaw detection device with a shielding function proposed in an embodiment of the present invention;

[0026] Description of the drawings: 1. Pipe; 2. Fixing ring; 3. Upper shielding shell; 4. Lower shielding shell; 5. X-ray machine connecting pin; 6. X-ray machine; 7. Shielding ring; 8. Device positioning pin; 9. Rotation positioning pin; 6. X-ray machine; 10. X-ray machine window; 11. Ray generator; 12. Lead shielding layer; 13. Stainless steel protective shell; 14. X-ray machine fixing device. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] like Figure 1 and Figure 2 As shown, the present invention proposes a small X-ray flaw detection device with a shielding function, which includes a fixing ring 2, an upper shielding shell 3, a lower shielding shell 4, an X-ray machine connecting pin 5, an X-ray machine 6, a shielding ring 7, a device positioning pin 8, a rotating positioning pin 9 and an X-ray machine fixing device 14.

[0029] The fixing ring 2 is positioned above the weld seam of the pipe 1 and is securely connected to the pipe 1 to ensure shielding and load-bearing capacity. A sliding groove is provided at one end of the fixing ring 2; the upper and lower shielding shells 3 and 4 overlap the sliding groove of the fixing ring 2. The fixing ring 2 is provided with a bolt hole A, within which is located a device locating pin 8, which secures the fixing ring 2 to the pipe 1. The fixing ring 2 is provided with an angled locating hole, and the lower shielding shell 4 is provided with a protrusion with a bolt hole B. Bolt hole B and the angled locating hole are penetrated by a rotating locating pin 9, which secures the upper and lower shielding shells 3 and 4. Both the device locating pin 8 and the rotating locating pin 9 are equipped with anti-drop rings to prevent them from loosening and falling off.

[0030] Both the upper and lower shielding shells 3 and 4 are hollow semi-cylindrical structures. They are hinged at one end and fastened with a latch and locked with a pin at the other end. They can rotate along the sliding grooves of the retaining ring 2. The shielding shells are designed to fit the dimensions of the pipe 1 and can flexibly rotate around it. The upper shielding shell 3 is fixedly connected to the X-ray machine fixture 14, which houses the X-ray machine 6.

[0031] like Figure 2 As shown, one side of the X-ray machine 6 is a cylindrical structure and the other side is a rectangular structure. A ray generator 11 is provided inside the X-ray machine 6, a stainless steel protective shell 13 is provided outside the X-ray machine 6, a lead shielding layer 12 is provided on the inner wall of the stainless steel protective shell 13, and an X-ray machine window 10 is provided on the cylindrical side of the X-ray machine 6.

[0032] The X-ray machine fixture 14 is a hollow semi-cylindrical structure that mates with the cylindrical structure of the outer surface of the X-ray machine 6. The X-ray machine fixture 14 has a window located at the location of the X-ray machine window 10, which is used to accommodate the X-ray machine window 10. The bottom of the X-ray machine fixture 14 is provided with an X-ray machine connecting pin 5, and a connecting hole is provided at a corresponding position on the X-ray machine. The X-ray machine connecting pin 5 is inserted into the connecting hole and is used to support and position the X-ray machine 6.

[0033] Shielding ring 7 is installed on the end of upper shielding shell 3 and lower shielding shell 4 not connected to fixing ring 2. Shielding ring 7 is used to shield scattered radiation from within the device. Shielding ring 7 is fixed to the other side of the inspected pipe 1 and is equipped with a shielding device. Shielding ring 7 primarily shields scattered radiation from within pipe 1 on the other side of pipe 1. Shielding ring 7 prevents direct contact between the shielding device and pipe 1, which could damage the surface of pipe 1.

[0034] The present invention proposes a small X-ray flaw detection method with a shielding function, which includes:

[0035] Step 1: Install the fixing ring 2 and the shielding ring 7 at both ends of the weld of the pipe 1. The fixing ring 2 is fixed to the pipe 1 by installing the positioning pin 8.

[0036] Step 2: Install the upper shielding shell 3 and the lower shielding shell 4 at the sliding groove position of the fixing ring 2. The upper shielding shell 3 and the lower shielding shell 4 are fixed in position by rotating the positioning pin 9 through the angle positioning hole and the threaded hole B.

[0037] Step 3: Install the X-ray machine 6 in the X-ray machine fixing device 14 outside the upper shielding shell 3.

[0038] Step 4: Put a film into the lower shielding shell 4. The opening and closing structure of the lower shielding shell 4 can realize the rapid replacement of the film. At the same time, use the X-ray machine 6 to carry out flaw detection on the pipeline 1.

[0039] Step 5: Take out the rotating positioning pin 9, rotate the positions of the upper shielding shell 3 and the lower shielding shell 4, insert the rotating positioning pin 9 again, use the X-ray machine 6 to carry out flaw detection of the pipeline 1 from different directions, and realize precise replacement through the angle positioning hole and locking device of the fixing ring 2 to realize all-round inspection of the weld of the pipeline 1.

[0040] Conventional X-ray flaw detection requires isolating an entire floor or an entire factory building. However, the X-ray flaw detection device of the present invention has a good shielding effect and can perform X-ray flaw detection operations in a smaller isolation area on a single floor. The X-ray flaw detection device is easy to assemble and disassemble, and the inspection efficiency is significantly improved. The X-ray machine 6 is tightly connected to the inspected pipeline 1 and the flaw detection device, and the space required for inspection is relatively small. Rapid positioning and all-round inspection can be achieved by simply rotating the X-ray flaw detection device.

[0041] Through practical application, the present inventors have found that using the aforementioned small-scale X-ray flaw detection device with shielding (130kV / 3mA), when the wall thickness of the inspected pipe is 6mm or less, the inspection results can reach the same level as conventional X-ray flaw detection. The maximum radiation dose rate at the surface of the flaw detection device is 140.0μSv / h, the radiation dose rate at a distance of 2 meters is 0.40μSv / h, and the radiation dose rate at a distance of 5 meters is 0.17μSv / h. This can significantly reduce the scope of the X-ray flaw detection isolation area at the inspection site, allowing other professional operations to be carried out simultaneously within 2 meters of the inspection site.

[0042] The above embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A small X-ray flaw detection device with shielding function, characterized in that: The device comprises a fixing ring (2), an upper shielding shell (3), a lower shielding shell (4), an X-ray machine fixing device (14) and an X-ray machine (6); the fixing ring (2) is arranged at the upper position of the weld of the pipeline (1); a sliding groove is provided at one end of the fixing ring (2); the upper shielding shell (3) and the lower shielding shell (4) are overlapped on the sliding groove of the fixing ring (2); the upper shielding shell (3) and the lower shielding shell (4) can rotate along the sliding groove of the fixing ring (2); the upper shielding shell (3) is fixedly connected to the X-ray machine fixing device (14) on the outside, and the X-ray machine fixing device (14) is provided with an X-ray machine (6) inside.

2. The small X-ray flaw detection device with shielding function according to claim 1, characterized in that: The upper shielding shell (3) and the lower shielding shell (4) are both hollow semi-cylindrical structures; one end of the upper shielding shell (3) and the lower shielding shell (4) are hingedly connected by a hinge, and the other end is connected by a buckle and locked with a pin.

3. The small X-ray flaw detection device with shielding function according to claim 2, characterized in that: The fixing ring (2) is provided with a bolt hole A, and a device positioning pin (8) is provided in the bolt hole A. The device positioning pin (8) is used to fix the fixing ring (2) on the pipeline (1).

4. The small X-ray flaw detection device with shielding function according to claim 3, characterized in that: The fixing ring (2) is provided with an angle positioning hole, the lower shielding shell (4) is provided with a protruding structure, the protruding structure is provided with a bolt hole B, the bolt hole B and the angle positioning hole are penetrated by a rotating positioning pin (9), and the rotating positioning pin (9) is used to fix the positions of the upper shielding shell (3) and the lower shielding shell (4).

5. The small X-ray flaw detection device with shielding function according to claim 1, characterized in that: A shielding ring (7) is installed at one end of the upper shielding shell (3) and the lower shielding shell (4) that is not connected to the fixing ring (2), and the shielding ring (7) is used to shield scattered rays inside the device.

6. The small X-ray flaw detection device with shielding function according to claim 5, characterized in that: The X-ray machine fixing device (14) is a hollow semi-cylindrical structure. The semi-cylindrical structure of the X-ray machine fixing device (14) is in contact with the outer surface of the X-ray machine (6). The X-ray machine fixing device (14) is provided with a window at the position of the X-ray machine window (10), and the window is used to place the X-ray machine window (10).

7. The small X-ray flaw detection device with shielding function according to claim 6, characterized in that: An X-ray machine connecting pin (5) is provided at the bottom of the X-ray machine fixing device (14), and a connecting hole is provided at a corresponding position of the X-ray machine. The X-ray machine connecting pin (5) is inserted into the connecting hole, and the X-ray machine connecting pin (5) is used to support and position the X-ray machine (6).

8. The small X-ray flaw detection device with shielding function according to claim 4, characterized in that: The device positioning pin (8) and the rotation positioning pin (9) are provided with an anti-fall ring, and the anti-fall ring is used to prevent the device positioning pin (8) and the rotation positioning pin (9) from falling off due to loosening.

9. A small X-ray flaw detection method with shielding function according to any one of claims 1 to 8, characterized in that: The method comprises: Step 1: Install a fixing ring (2) and a shielding ring (7) at both ends of the weld of the pipeline (1); Step 2: Installing the upper shielding shell (3) and the lower shielding shell (4) at the sliding groove position of the fixing ring (2), and fixing the positions of the upper shielding shell (3) and the lower shielding shell (4) by rotating the positioning pin (9); Step 3: Installing the X-ray machine (6) in the X-ray machine fixing device (14) of the upper shielding shell (3); Step 4: Use an X-ray machine (6) to perform flaw detection on the pipeline (1). Step 5: Take out the rotating positioning pin (9), rotate the positions of the upper shielding shell (3) and the lower shielding shell (4), insert the rotating positioning pin (9) again, and use the X-ray machine (6) to carry out flaw detection of the pipeline (1) from different directions.

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