positioning device

Abstract

The utility model relates to a positioning device, fixed in the window of ray machine, the positioning device includes fixed frame, sets up the arc plate on fixed frame, the telescopic link that makes arc line movement along the arc plate, be equipped with the movement component between telescopic link with the arc plate, the plane of arc plate coincides with the axis of work piece perpendicularly, the centre of the arc plate coincides with the focus of ray machine, the first end of telescopic link sets up on the movement component, the second end of telescopic link extends in the radial direction of arc plate and away from the direction of ray machine. The utility model discloses a novel positioning structure of arc plate and telescopic link, can accurately determine the distance between the window of ray machine and work piece surface, and then accurately determine the focal length of ray penetration, and can accurately determine the cut point position of ray and work piece surface, realize accurate positioning and quick installation to contrast test piece, improve work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of pipeline inspection technology, and in particular to a positioning device. Background Technology

[0002] When performing radiographic testing on workpieces according to the standard "Non-destructive Testing of Pressure Equipment - Part 2: Radiographic Testing" NB / T47013.2-2015, the focal length of the X-ray image should be positioned according to the requirements in the standard appendix. Currently, a measuring tape is often used for direct measurement, but the focal point of the X-ray machine is actually inside the machine. The measuring tape can only measure the distance from the window to the workpiece surface, and the actual distance is often estimated. For the double-wall double-image radiography method, a rope is often used for estimation, which cannot accurately determine the deflection angle. Meanwhile, according to GB / T43658.1-2024 "Non-destructive Testing of Pipeline Corrosion and Deposits - X-ray and Gamma Ray Inspection - Part 1: Tangential Radiographic Inspection," when performing tangential radiographic inspection on pipelines for corrosion and deposits, a comparative specimen must be used for dimensional calibration. During this calibration process, the placement of the comparative specimen can currently only be determined visually, which introduces a certain degree of error.

[0003] Therefore, there is a need for a positioning device that can accurately determine the focal length of X-ray transmission and the tangent point of the X-ray, thereby improving the efficiency and accuracy of X-ray detection of pipeline corrosion and deposits. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a positioning device.

[0005] The technical solution of this utility model is as follows: A positioning device is fixed to the window of an X-ray machine. The positioning device includes a fixed frame, an arc plate disposed on the fixed frame, and a telescopic rod that moves along the arc plate in an arc. A moving component is provided between the telescopic rod and the arc plate. The plane of the arc plate is perpendicular to the axis of the workpiece. The center of the arc plate coincides with the focal point of the X-ray machine. A first end of the telescopic rod is disposed on the moving component, and a second end of the telescopic rod extends radially away from the X-ray machine along the arc plate.

[0006] As a further improvement of this utility model, the angle range of the arc plate is greater than the angle range of the rays emitted by the X-ray machine.

[0007] As a further improvement of this utility model, the arc plate is provided with angle scale lines, and the first end of the telescopic rod is provided with a pointer that cooperates with the angle scale lines.

[0008] As a further improvement of this utility model, the scale at the midpoint of the arc plate is 0°, and the value of the angle scale line increases from the midpoint to both sides.

[0009] As a further improvement of this utility model, the fixing frame includes a ring body, which is sleeved on the window of the X-ray machine. The ring body is provided with a fixing component that is fixed to the window. The end of the ring body away from the X-ray machine is provided with a connecting rod extending in a direction away from the X-ray machine, and the arc plate is disposed on the connecting rod.

[0010] As a further improvement of this utility model, at least one through hole is provided on the side wall of the ring body, and the fixing component includes an internal thread disposed in the through hole and a fixing screw that mates with the internal thread.

[0011] As a further improvement of this utility model, the ring body and the connecting rod are detachable and replaceable, and multiple ring bodies are provided, with different inner diameters for the multiple ring bodies.

[0012] As a further improvement of this utility model, the telescopic rod is provided with a scale.

[0013] As a further improvement of this utility model, the moving component includes an arc-shaped guide rail disposed on the arc plate and a slider disposed on the arc-shaped guide rail, and the telescopic rod is disposed on the slider.

[0014] As a further improvement of this utility model, the arc plate is provided with a fixing member for fixing the slider.

[0015] According to the above-described solution, the beneficial effects of this utility model are as follows: This utility model adopts a novel positioning structure of arc plate and telescopic rod, which can accurately determine the distance between the X-ray machine window and the workpiece surface, thereby accurately determining the focal length of X-ray transmission, and accurately determining the tangent point between the X-ray and the workpiece surface. This enables precise positioning and rapid installation of comparative specimens, improving work efficiency. It also plays a good auxiliary role in the implementation of NB / T47013.2-2015 and GB / T43658.1-2024, and can well ensure the quality and final accuracy of dimensional calibration work. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the assembly of this utility model with an X-ray machine; Figure 3 This is a schematic diagram illustrating the operation of focal length measurement according to this utility model; Figure 4 This is a schematic diagram illustrating the operation of the tangent point positioning of this utility model.

[0017] In the diagram: 1. X-ray machine; 2. Arc plate; 21. Angle scale line; 3. Telescopic rod; 4. Ring body; 5. Connecting rod; 6. Fixing screw; 7. Arc guide rail; 8. Slider; 9. Workpiece. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] See Figure 1 and Figure 2This utility model provides a positioning device fixed to the window of a X-ray machine 1. The positioning device includes a fixed frame, an arc plate 2 set on the fixed frame, and a telescopic rod 3 that moves along the arc plate 2 in an arc. A moving component is provided between the telescopic rod 3 and the arc plate 2. The moving component drives the telescopic rod 3 to move. The plane where the arc plate 2 is located is perpendicular to the axis of the workpiece 9. The center of the arc plate 2 coincides with the focal point of the X-ray machine 1. That is, the movement trajectory of the telescopic rod 3 is on the circumference of a circle with the X-ray machine 1 as the center. The first end of the telescopic rod 3 is set on the moving component, and the second end of the telescopic rod 3 extends radially away from the X-ray machine 1 along the arc plate 2. That is, the telescopic rod 3 is set radially along the arc plate 2. The first end of the telescopic rod 3 always points to the focal point of the X-ray machine 1, and the second end of the telescopic rod 3 can be extended or retracted according to specific needs to achieve the required length.

[0022] The factors that determine the focal length include: the distance from the window of the X-ray machine 1 to the surface of the workpiece 9, the wall thickness of the workpiece 9, the diameter of the workpiece 9, and the distance from the window of the X-ray machine 1 to the focal point; The distance from the window of X-ray machine 1 to the focal point is a constant value. Taking the 300KV series X-ray machine as an example, the distance from the window of X-ray machine 1 to the focal point is 100mm. Since the wall thickness of workpiece 9, the diameter of workpiece 9, and the distance from the window of X-ray machine 1 to the focal point are all constant values ​​and known, the key to measuring the focal length is to measure the distance from the window of X-ray machine 1 to the surface of workpiece 9. See Figure 3 Determine the distance from the window of X-ray machine 1 to the surface of workpiece 9; Extend the telescopic rod 3 to the set length, place the second end of the telescopic rod 3 against the surface of the center of the workpiece 9, and measure the distance between the window of the X-ray machine 1 and the arc plate 2, as well as the extension length of the telescopic rod 3. The distance from the window of the X-ray machine 1 to the surface of the workpiece 9 is equal to the distance between the window of the X-ray machine 1 and the arc plate 2 plus the extension length of the telescopic rod 3. That is, the operator can conveniently and accurately measure the distance from the window of the X-ray machine 1 to the surface of the workpiece 9. Combined with the known wall thickness of the workpiece 9, the diameter of the workpiece 9, and the distance from the window of the X-ray machine 1 to the focal point, the focal length can be calculated. Preferably, the telescopic rod 3 is equipped with a scale, which can directly reflect the extension length of the telescopic rod 3 without the need for re-measurement, reducing measurement steps and further improving work efficiency. See Figure 4 Determine the position of the tangent point between the rays emitted by X-ray machine 1 and the surface of workpiece 9; The telescopic rod 3 is moved to one edge of the arc plate 2 and stretched to a set length, ensuring that it contacts the workpiece 9 during movement. Preferably, the telescopic rod 3 is stretched to its maximum length and moved along the arc plate 2 towards the center until it contacts the surface of the workpiece 9. This contact point is the first tangent point. The telescopic rod 3 is then retracted and moved to the other edge of the arc plate 2, stretched to its maximum length again, and moved along the arc plate 2 towards the center until it contacts the surface of the workpiece 9. This contact point is the second tangent point. At this point, the two tangent point positions of the X-ray emitted by the X-ray machine 1 and the surface of the workpiece 9 are determined. Finally, the comparison specimen is placed at the two tangent point positions for corrosion tangent detection. The entire process of confirming the tangent point position is simple to operate and does not require measurement, avoiding unnecessary influence of measurement errors on the tangent point position and improving the accuracy and reliability of the tangent point position.

[0023] This utility model adopts a novel positioning structure of arc plate 2 and telescopic rod 3, which can accurately determine the distance between the window of X-ray machine 1 and the surface of workpiece 9, thereby accurately determining the focal length of X-ray transmission. It can also accurately determine the tangent point between the X-ray emitted by X-ray machine 1 and the surface of workpiece 9, enabling precise positioning and rapid installation of comparative specimens, effectively improving work efficiency. It can play a good auxiliary role in the implementation of NB / T47013.2-2015 and GB / T43658.1-2024, and can well ensure the quality and final accuracy of dimensional calibration work.

[0024] As an embodiment of this utility model, the angle range of the arc plate 2 is greater than the angle range of the rays emitted by the X-ray machine 1, which can ensure that all rays emitted by the X-ray machine 1 fall within the angle range of the arc plate 2. That is, the telescopic rod 3 can be made parallel to any ray emitted by the X-ray machine 1 by adjusting the angle. Thus, the positional relationship between the ray emitted by the X-ray machine 1 and the workpiece 9 can be confirmed by the position of the telescopic rod 3 and the workpiece 9. This transforms the intangible into the tangible and the optical path into a physical entity, and can more accurately determine the distance from the window of the X-ray machine 1 to the surface of the workpiece 9, as well as the tangent point between the ray emitted by the X-ray machine 1 and the surface of the workpiece 9, thereby further improving the overall stability and reliability.

[0025] As an embodiment of this utility model, the arc plate 2 is provided with an angle scale line 21, and the first end of the telescopic rod 3 is provided with a pointer that cooperates with the angle scale line 21. Through the cooperation of the angle scale line 21 and the pointer, the position and angle of the telescopic rod 3 can be intuitively grasped, which can improve the accuracy and reliability of the focal length and tangent position to a certain extent. The arc range of the arc plate 2 can be adjusted according to specific usage requirements, such as between 90° and 150°. Preferably, the arc of the arc plate 2 is 120°, which can ensure that the rays emitted by the X-ray machine 1 fall within the angle range of the arc plate 2, and can also avoid the arc of the arc plate 2 being too large, causing waste and other unnecessary effects.

[0026] As one embodiment of this utility model, the angle scale line 21 can adopt the following two structures: Structure 1: The scale at the midpoint of the arc plate 2 is 0°. The value of the angle scale line 21 increases from the midpoint to both sides. Taking the arc of the arc plate 2 as 120° as an example, the scale at both ends of the arc plate 2 is 60°. Taking the midpoint of the arc plate 2 as the origin, and combining it with the reading of the angle scale line 21, the current position of the telescopic rod 3 can be known. The position of the telescopic rod 3 can be precisely adjusted. In addition, when the position of the telescopic rod 3 changes, the angle of the telescopic rod 3 deflection to the left or right relative to the origin can be calculated more accurately and conveniently. Structure 2: The scale at the first end of the arc plate 2 is 0°. The value of the angle scale line 21 increases from the first end to the second end. Taking the arc of the arc plate 2 as 120° as an example, the scale at the midpoint of the arc plate 2 is 60°, and the scale at the second end of the arc plate 2 is 120°.

[0027] As one embodiment of this utility model, the fixing frame includes a ring 4, which is sleeved on the window of the X-ray machine 1. Preferably, the surface of the ring 4 is flush with the surface of the window of the X-ray machine 1. The ring 4 is provided with a fixing component for fixing to the window. The end of the ring 4 away from the X-ray machine 1 is provided with a connecting rod 5 extending in a direction away from the X-ray machine 1. The arc plate 2 is set on the connecting rod 5. The connecting rod 5 can adopt any form of structure, but it must be ensured that the connecting rod 5 will not block the X-ray emitted by the X-ray machine 1 and affect the transmission of the light path. Preferably, the distance between the window of the X-ray machine 1 and the inner arc surface of the arc plate 2 is 185mm, and the distance between the window of the X-ray machine 1 and the outer arc surface of the arc plate 2 is 200mm, that is, the width of the arc plate 2 is 15mm.

[0028] As one embodiment of this utility model, there are two connecting rods 5, which are symmetrically arranged. The two connecting rods 5 can symmetrically fix the arc plate 2, which can not only improve the connection strength between the ring body 4 and the arc plate 2, but also make the arc plate 2 bear the force evenly, thus improving the service life of the arc plate 2. In addition, the two connecting rods 5 can also play a redundant role. When one connecting rod 5 is damaged, the other connecting rod 5 can continue to maintain the connection between the ring body 4 and the arc plate 2, maintain the positioning device to continue to work, and improve the overall working stability and reliability. Preferably, each end of the arc plate 2 is connected to a connecting rod 5, that is, there are no connecting parts in the middle part of the arc plate 2, which can further avoid the connecting rods 5 from blocking the rays emitted by the X-ray machine 1.

[0029] As an embodiment of this utility model, the side wall of the ring body 4 is provided with at least one through hole. The fixing component includes an internal thread set in the through hole and a fixing screw 6 that mates with the internal thread. The fixing screw 6 is screwed into the through hole in mate with the internal thread. One end of the fixing screw 6 passes through the through hole and abuts against the window housing of the X-ray machine 1, thereby realizing the fixed connection between the ring body 4 and the X-ray machine 1. Preferably, the fixing screw 6 is a butterfly screw, which can be fixedly connected between the ring body 4 and the X-ray machine 1 by hand tightening by the operator, making the disassembly and assembly of the ring body 4 convenient and easy, and improving the assembly efficiency of the positioning device.

[0030] As one embodiment of this utility model, the through hole and the fixing screw 6 can adopt the following three structures: Structure 1: There is one through hole and one fixing screw 6, which is installed inside the through hole; Structure 2: There are multiple through holes and at least one fixing screw 6. The number of fixing screws 6 is less than the number of through holes, and each fixing screw 6 is set in one of the through holes. Structure 3: There are multiple through holes and multiple fixing screws 6, and the number of fixing screws 6 is equal to the number of through holes. All the fixing screws 6 are set in the through holes one by one.

[0031] Preferably, when multiple through holes are provided, the multiple through holes are evenly distributed, and each through hole is provided with a fixing screw 6, which can fix the ring body 4 and the X-ray machine 1 from multiple angles. This not only improves the connection strength between the ring body 4 and the X-ray machine 1 and prevents the ring body 4 from falling off, but also improves the uniformity of the force on the ring body 4, ensuring the accuracy and reliability of the installation position of the ring body 4. At the same time, the multiple fixing screws 6 provide redundancy for each other. When one fixing screw 6 loosens or falls off, the other fixing screws 6 can continue to maintain the connection between the ring body 4 and the X-ray machine 1, maintain the normal operation of the positioning device, and further improve the overall working stability and reliability.

[0032] As one embodiment of this utility model, the ring body 4 and the connecting rod 5 are detachable and replaceable. There are multiple ring bodies 4, and the inner diameters of the multiple ring bodies 4 are different. The operator can select a ring body 4 with a suitable inner diameter according to the specific size of the X-ray machine 1 window. This ensures that the ring body 4 can be fitted onto the window of the X-ray machine 1, while avoiding excessive gaps between the ring body 4 and the window of the X-ray machine 1, thus ensuring the stability and reliability of the connection between the ring body 4 and the X-ray machine 1. Similarly, there are multiple sets of connecting rods 5, and the lengths of the multiple sets of connecting rods 5 are different. The operator can also select a connecting rod 5 of a suitable length according to specific usage requirements, effectively improving the applicability of the positioning device.

[0033] As one embodiment of this utility model, the moving component includes an arc-shaped guide rail 7 disposed on the arc plate 2 and a slider 8 disposed on the arc-shaped guide rail 7. The telescopic rod 3 is disposed on the slider 8. Through the cooperation of the arc-shaped guide rail 7 and the slider 8, the telescopic rod 3 can be driven to move, and the movement of the telescopic rod 3 can be guided, thereby improving the accuracy of the movement trajectory of the telescopic rod 3. At the same time, it can also ensure the accuracy of the focal length and tangent position, and improve the reliability of the positioning device. Preferably, the moving component can also be configured with a motor according to the usage requirements. The slider 8 can be driven by the motor to move, which can further improve the overall automation level.

[0034] As one embodiment of this utility model, the arc plate 2 is provided with a fixing member for fixing the slider 8. When the slider 8 reaches the designated position, the fixing member positions the slider 8 to prevent the slider 8 from moving. Preferably, the arc plate 2 is provided with multiple through holes, and the slider 8 is provided with corresponding threaded holes. The fixing member is a butterfly screw. When the slider 8 moves to the designated position, the operator passes the butterfly screw through the through hole and screws it into the threaded hole to fix the arc plate 2 and the slider 8.

[0035] In summary, this utility model provides a positioning device that employs a novel positioning structure of an arc plate 2 and a telescopic rod 3. This structure can accurately determine the distance between the window of the X-ray machine 1 and the surface of the workpiece 9, thereby accurately determining the focal length of the X-ray transmission. Furthermore, it can accurately determine the tangent point between the X-ray emitted by the X-ray machine 1 and the surface of the workpiece 9. This enables precise positioning and rapid installation of the comparative specimen, effectively improving work efficiency. It also provides excellent assistance in implementing NB / T47013.2-2015 and GB / T43658.1-2024, ensuring the quality and final accuracy of dimensional calibration work. Through the coordination of the angle scale line 21 and the pointer, the position and angle of the telescopic rod 3 can be intuitively grasped, improving the accuracy and reliability of the focal length and tangent point position to a certain extent.

[0036] It should be emphasized that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A positioning device fixed to the window of an X-ray machine (1), characterized in that, The positioning device includes a fixed frame, an arc plate (2) set on the fixed frame, and a telescopic rod (3) that moves along the arc plate (2) in an arc. A moving component is provided between the telescopic rod (3) and the arc plate (2). The plane of the arc plate (2) is perpendicular to the axis of the workpiece (9). The center of the arc plate (2) coincides with the focal point of the X-ray machine (1). The first end of the telescopic rod (3) is set on the moving component, and the second end of the telescopic rod (3) extends radially away from the X-ray machine (1) along the arc plate (2). The moving component includes an arc-shaped guide rail (7) set on the arc plate (2), a slider (8) set on the arc-shaped guide rail (7), and a motor. The telescopic rod (3) is set on the slider (8), and the motor drives the slider (8) to move.

2. The positioning device according to claim 1, characterized in that, The angle range of the arc plate (2) is greater than the angle range of the rays emitted by the ray machine (1).

3. The positioning device according to claim 1, characterized in that, The arc plate (2) is provided with an angle scale line (21), and the first end of the telescopic rod (3) is provided with a pointer that cooperates with the angle scale line (21).

4. The positioning device according to claim 3, characterized in that, The scale at the midpoint of the arc plate (2) is 0°, and the value of the angle scale line (21) increases from the midpoint to both sides.

5. The positioning device according to claim 1, characterized in that, The fixing frame includes a ring (4), which is fitted onto the window of the X-ray machine (1). The ring (4) is provided with a fixing component that is fixed to the window. The end of the ring (4) away from the X-ray machine (1) is provided with a connecting rod (5) extending in a direction away from the X-ray machine (1). The arc plate (2) is provided on the connecting rod (5).

6. The positioning device according to claim 5, characterized in that, The ring (4) has at least one through hole on its side wall, and the fixing component includes an internal thread disposed in the through hole and a fixing screw (6) that engages with the internal thread.

7. The positioning device according to claim 5, characterized in that, The ring (4) and the connecting rod (5) are detachable and replaceable. There are multiple rings (4), and the inner diameters of the multiple rings (4) are different.

8. The positioning device according to claim 1, characterized in that, The telescopic rod (3) is equipped with a scale.

9. The positioning device according to claim 1, characterized in that, The arc plate (2) is provided with a fixing component for fixing the slider (8).

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