Radiographic centering exposure device

Abstract

The utility model relates to petrochemical pipeline weld flaw detection technical field, concretely relates to a kind of ray detection center exposure device convenient to center, including support cylinder, locking seat, moving seat and multiple groups of telescopic frame, the front end of support cylinder is equipped with exposure cabin, locking seat is fixed in support cylinder, the outside of support cylinder is provided with screw thread along the length direction of itself, moving seat is screwed and cooperates with the sleeve outside support cylinder;Multiple groups of telescopic frame are arranged around the circumference of support cylinder, and each telescopic frame includes the first arm body and the second arm body arranged in X shape, the middle portion of both is hingedly connected, the inner end of first arm body is hingedly connected to locking seat, the inner end of second arm body is hingedly connected to moving seat, and second arm body moves along the axial direction of support cylinder following moving seat, and does not rotate following it.Compared with prior art, reduce the case that film is unqualified due to the placement position of radioactive source is not correct, save detection cost;It is suitable for pipeline weld fast center focusing ray detection, wide range of application, reduce center focusing time, improve detection efficiency.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical pipeline weld flaw detection technology, specifically to an exposure device for a centrally located X-ray inspection center. Background Technology

[0002] Gamma rays are high-energy electromagnetic waves with strong penetrating power, capable of passing through many substances opaque to visible light. When gamma rays emitted from a gamma source penetrate an object being examined, the rays interact with the atoms within the object, resulting in photoelectric effect, Compton effect, and pair production, thus causing the energy of the rays to attenuate. Factors such as the object's density, thickness, and composition affect the degree of gamma ray attenuation. Generally, the denser and thicker the object, the more significant the attenuation of gamma rays. Because different parts of an object attenuate gamma rays differently, the intensity of the rays reaching the film varies, resulting in images of different gray levels on the film, which can then be used to observe the internal structure and defects of the object.

[0003] Early gamma-ray inspection operations typically employed a clamping device for assistance. This device securely held the gamma-ray source tube; then, it was carefully placed inside the pipe to be inspected; subsequently, the device was moved to the specific location requiring inspection; finally, the gamma-ray source was extracted from the tube, thus completing the gamma-ray inspection of the pipe weld.

[0004] Existing gamma-ray inspection clamping devices cannot quickly and centrally position the gamma source, resulting in low inspection efficiency. If the gamma source cannot be centrally positioned, the attenuation varies depending on the location of the gamma source relative to the pipe weld, leading to differences in the intensity of the rays reaching the film and consequently causing the film to fail.

[0005] Furthermore, the clamping device for gamma-ray detection cannot guarantee the exposure position of the gamma source. The clamping device may block the exposure of the gamma source, resulting in debris projection on the film and thus rendering the film unusable.

[0006] For example, Chinese patent document CN103512907A discloses an X-ray machine conveying, positioning, and exposure device for circumferential butt welded joints of pipelines, including a vehicle body, a machine body, and a push rod. The vehicle body includes a body, wheels, a front support, and a rear support. One end of the push rod is connected to the pipe end at the rear end of the vehicle body. The X-ray machine is mounted on the inner grooves of the front and rear supports. The machine body includes a clamp belt front ring, a clamp belt rear ring, a clamp belt crossarm, a laser positioning mechanism, and a camera positioning mechanism. The laser positioning mechanism includes a laser positioning tube, with the laser installed inside the laser positioning tube, which is rotatably mounted on the clamp belt front ring. Compared with the conventional double-wall single-image external transmission method, this device improves the detection efficiency by at least five times and significantly improves the detection quality. Compared with a semi-automatic pipeline center exposure device, it weighs only one-tenth of the latter, requires no charging, is quick to assemble and disassemble, is easy to operate, and improves the detection efficiency by an average of 30%.

[0007] For example, Chinese patent document CN110018185B discloses a radiographic testing center exposure device and method for nuclear power plant welds. The device includes a source sleeve, a drive assembly, a sliding limit sleeve, and a positioning lock. It can perform radiographic testing on thick welds in large-diameter pipelines of nuclear power plants by irradiating them from the center. During the central irradiation of large-diameter pipelines, the nuclear power plant weld radiographic testing center exposure device can automatically align the source head with the central axis of the pipeline aligned with the weld, avoiding human error and saving alignment time. Furthermore, the invention is simple to operate, effectively reducing the radiation safety risks that may arise from repeated film placement, source extraction, and inspection by operators. It also saves radiographic testing time, improves work efficiency, and optimizes the overall maintenance schedule of nuclear power plants.

[0008] The sliding limit sleeve of the above-mentioned weld radiographic testing center exposure device is fixed by a positioning lock after moving to the preset position. There is room for improvement in terms of ease of operation. Summary of the Invention

[0009] In view of the above-mentioned technical problems existing in the prior art, the present invention provides an exposure device for a conveniently centered X-ray detection center.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] A conveniently centered X-ray inspection center exposure device is provided for positioning the source tube on the central axis of the pipe being inspected. The device is characterized by including a support cylinder, a locking seat, a movable seat, and multiple sets of telescopic frames. The front end of the support cylinder is provided with an exposure chamber, and the source tube is connected to the rear end of the support cylinder.

[0012] The locking seat is fixed to the support cylinder, and the outer side of the support cylinder is provided with threads along its own length. The moving seat is threaded and fitted onto the outside of the support cylinder.

[0013] Multiple telescopic frames are arranged around the circumference of the support cylinder. Each telescopic frame includes a first arm and a second arm arranged in an X shape. The middle parts of the first arm and the second arm are hinged to each other. The inner end of the first arm is hinged to the locking seat, and the inner end of the second arm is hinged to the moving seat. The second arm moves along the axial direction of the support cylinder with the moving seat, but does not rotate in the direction of rotation.

[0014] As a further alternative, the outer ends of the first and second arms are respectively provided with rollers for abutting against the inner wall of the pipe being measured.

[0015] As a further alternative, the outer ends of the first and second arms are fixed with U-shaped brackets, and the rotating wheel is rotatably mounted on the brackets via a pivot pin.

[0016] As a further optional solution, the inner ends of the first arm and the second arm are respectively provided with connecting seats, which are connected to the movable seat.

[0017] As a further alternative, the locking seat is welded to the support cylinder, or the locking seat is interference-fitted to the support cylinder, or the locking seat is fixed to the support cylinder by a snap fastener.

[0018] As a further alternative, a stop seat is provided at the rear end of the support cylinder to limit the travel of the moving seat.

[0019] As a further alternative, the locking seat and / or the movable seat are cylindrical.

[0020] As a further alternative, the exposure chamber can be detachably connected to the front end of the support cylinder.

[0021] As a further alternative, the exposure chamber is a metal cylinder with a cavity, which is coaxially connected to the support cylinder.

[0022] As a further alternative, the source tube extends from the rear end of the support cylinder.

[0023] The beneficial effects of this utility model are:

[0024] This utility model discloses a conveniently centered X-ray inspection centering exposure device. During use, the movable seat can be rotated along the axial direction of the support cylinder according to the inner diameter of the pipe being inspected. The included angle between the first and second arms of each telescopic frame increases or decreases, thereby adjusting the outer ends of the first and second arms to abut against the inner wall of the pipe being inspected. This ensures that the support cylinder, the source tube, and the exposure chamber are centered on the pipe, reducing the likelihood of substandard films due to incorrect radiation source placement and saving inspection costs. It is suitable for rapid centered focusing of pipe welds in X-ray inspection, has a wide range of applications, reduces centering time, and improves inspection efficiency. Furthermore, since the relative movement between the movable seat and the support cylinder is achieved through a threaded connection, the movable seat can be stopped and fixed when it reaches the appropriate position, making operation convenient. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an exposure device for centered X-ray detection center, as shown in the embodiment.

[0026] Figure label:

[0027] Support cylinder 1, locking seat 2, moving seat 3, source tube 4;

[0028] Telescopic frame 5, first arm 51, second arm 52;

[0029] Exposure chamber 6, card holder 7, connecting seat 8, stop seat 9, rotating wheel 10. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] This embodiment provides a convenient, centered X-ray inspection center exposure device, such as... Figure 1 As shown, it includes a support cylinder 1, a locking seat 2, a movable seat 3, a source tube 4, and three sets of telescopic frames 5. The front end of the support cylinder 1 is provided with an exposure chamber 6, and the source tube 4 is connected to the rear end of the support cylinder 1. The exposure chamber 6 is a metal cylinder with a cavity, which is coaxially connected to the support cylinder 1. The source tube 4 extends out from the rear end of the support cylinder 1.

[0032] In this embodiment, the locking seat 2 and the movable seat 3 are cylindrical. The locking seat 2 is fixed to the support cylinder 1. The outer side of the support cylinder 1 is provided with threads along its own length direction. The movable seat 3 is threaded and fitted onto the outside of the support cylinder 1. That is, when the movable seat 3 rotates, it can move along the axial direction of the support cylinder 1.

[0033] In this embodiment, three sets of telescopic frames 5 are evenly arranged around the circumference of the support cylinder 1. Each set of telescopic frames 5 includes a first arm 51 and a second arm 52 of equal length arranged in an X-shape. The middle positions of the first arm 51 and the second arm 52 are hinged to each other via a pivot pin. The inner end of the first arm 51 is hinged to the locking seat 2, and the inner end of the second arm 52 is hinged to the moving seat 3. The second arm 52 moves along the axial direction of the support cylinder 1 with the moving seat 3, but does not rotate in the direction of rotation.

[0034] In use, depending on the inner diameter of the pipe being tested, rotating the movable seat 3 will allow it to move axially along the support cylinder 1. The angle between the first arm 51 and the second arm 52 of each telescopic frame 5 will increase or decrease, thereby adjusting the outer ends of the first arm 51 and the second arm 52 to abut against the inner wall of the pipe being tested, thus ensuring that the support cylinder 1, the source tube 4, and the exposure chamber 6 are located in the center of the pipe being tested.

[0035] In this embodiment, the outer ends of the first arm body 51 and the second arm body 52 are fixed with U-shaped brackets 7, and the brackets 7 are rotatably provided with a rotating wheel 10 for abutting against the inner wall of the pipe being tested via a pivot pin.

[0036] In this embodiment, the inner ends of the first arm body 51 and the second arm body 52 are respectively provided with connecting seats 8. The connecting seats 8 are connected to the movable seat 3. The connecting seats 8 move along the axial direction of the support cylinder 1 with the movable seat 3, but do not rotate in the rotation direction. Specifically, this can be achieved by: opening an annular groove on the outer side of the movable seat 3, and partially embedding the connecting seats 8 in the annular groove; or by setting a bearing between the connecting seats 8 and the movable seat 3. Both methods can achieve independent rotation of the movable seat 3 relative to the connecting seats 8, while moving together in the axial direction. This will not be elaborated here.

[0037] The locking seat 2 is fixed relative to the support cylinder 1 in both the axial and circumferential directions. Specifically, the locking seat 2 can be welded to the support cylinder 1, or the locking seat 2 can be interference-fitted to the support cylinder 1, or the locking seat 2 can be fixed to the support cylinder 1 by a snap fastener.

[0038] In this embodiment, a stop seat 9 is provided at the rear end of the support cylinder 1 to limit the travel of the movable seat 3.

[0039] In this embodiment, the exposure chamber 6 is detachably connected to the front end of the support cylinder 1, which facilitates disassembly and maintenance.

[0040] Taking gamma-ray inspection as an example, existing equipment typically includes an external gamma source, a gamma source container, and a push rod. The gamma source container, the source tube 4, and the exposure chamber 6 are connected sequentially. The exposure chamber 6 is a metal cavity. During inspection, the inspector uses the push rod to push the gamma source out of the gamma source container. The push rod pushes the gamma source through the source tube 4 and the support cylinder 1 until the push rod can no longer move forward, indicating that the gamma source has reached the exposure chamber 6 and inspection begins. This method eliminates the risk of the clamping device obstructing the exposure of the gamma source during gamma-ray inspection of pipe welds. Compared with existing technologies, this method is suitable for rapid, centered, and focused gamma-ray inspection of pipe welds with a diameter less than 600mm, has a wide range of applications, reduces the centering time of the gamma source, and improves inspection efficiency. It also allows for fixed placement of the gamma source, reducing the possibility of unqualified films due to incorrect gamma source placement and saving inspection costs.

[0041] In the description of this utility model, it is obvious that the described embodiments are only a part of the embodiments of this utility model, and not all of them. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0043] In the description of this utility model, it should be noted that the terms "middle," "upper," "lower," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

Claims

1. A conveniently centered X-ray inspection center exposure device for positioning the source tube on the central axis of the pipe being inspected, characterized in that: It includes a support cylinder, a locking seat, a movable seat, and multiple sets of telescopic frames. The front end of the support cylinder is equipped with an exposure chamber, and the source tube is connected to the rear end of the support cylinder. The locking seat is fixed to the support cylinder, and the outer side of the support cylinder is provided with threads along its own length. The moving seat is threaded and fitted onto the outside of the support cylinder. Multiple telescopic frames are arranged around the circumference of the support cylinder. Each telescopic frame includes a first arm and a second arm arranged in an X shape. The middle parts of the first arm and the second arm are hinged to each other. The inner end of the first arm is hinged to the locking seat, and the inner end of the second arm is hinged to the moving seat. The second arm moves along the axial direction of the support cylinder with the moving seat, but does not rotate in the direction of rotation.

2. The X-ray inspection center exposure device for easy centering according to claim 1, characterized in that: The outer ends of the first and second arms are respectively equipped with rollers for abutting against the inner wall of the pipe being measured.

3. The X-ray inspection center exposure device for easy centering according to claim 2, characterized in that: The outer ends of the first and second arms are fixed with U-shaped brackets, and the rotating wheel is rotatably mounted on the brackets via a shaft pin.

4. The X-ray inspection center exposure device for easy centering according to claim 1, characterized in that: The inner ends of the first and second arms are respectively provided with connecting seats, which are connected to the movable seats.

5. The X-ray inspection center exposure device for easy centering according to claim 1, characterized in that: The locking seat is welded to the support cylinder, or the locking seat is interference-fitted to the support cylinder, or the locking seat is fixed to the support cylinder by a snap fastener.

6. The X-ray inspection center exposure device for easy centering according to claim 1, characterized in that: A stop seat is provided at the rear end of the support cylinder to limit the travel of the moving seat.

7. The X-ray inspection center exposure device for easy centering according to claim 1, characterized in that: The locking seat and / or the movable seat are cylindrical.

8. The X-ray inspection center exposure device for easy centering according to claim 1, characterized in that: The exposure chamber is detachably connected to the front end of the support cylinder.

9. The X-ray inspection center exposure device for easy centering according to claim 1, characterized in that: The exposure chamber is a metal cylinder with a cavity, which is coaxially connected to the support cylinder.

10. The X-ray inspection center exposure device for easy centering according to claim 1, characterized in that: The source tube extends from the rear end of the support cylinder.

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