A device for detecting circumferential welds in pipes

Abstract

This utility model relates to the field of pipeline weld inspection technology, and proposes a pipeline circumferential weld inspection device, including a guide rail, a traveling mechanism, and a radiographic imaging mechanism. The radiographic imaging mechanism includes an imaging plate, multiple side ribs, a protective plate, and bolts. The imaging plate is fixedly mounted on the traveling mechanism. The side ribs are integrally formed on the periphery of the imaging plate, and threaded holes are provided at the connection between the side ribs and the imaging plate. The protective plate is abutted against the imaging plate. The bolts pass through the protective plate and are threadedly connected to the threaded holes, with the bolts supporting the protective plate. By providing side ribs on the periphery of the imaging plate and providing threaded holes at the connection between the side ribs and the imaging plate, this utility model not only allows the protective plate to be installed on the side of the imaging plate closest to the metal pipe for protection, but also reduces the space occupied by the imaging plate shell and improves the heat dissipation performance of the imaging plate.

Description

Technical Field

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

[0002] In industries such as oil, natural gas, and chemicals, pipelines serve as the primary means of material transport, and their safety and reliability are of paramount importance. Pipeline systems are typically constructed by welding long sections of steel pipe together to form a continuous material transport channel. At the circumferential weld, defects such as cracks, slag inclusions, and incomplete fusion can easily occur. These defects directly affect the overall strength and sealing performance of the pipeline, and in severe cases, may lead to material leakage or even safety accidents. Therefore, the inspection of pipeline circumferential welds is essential.

[0003] To improve the efficiency and accuracy of pipeline circumferential weld inspection while reducing inspection costs, automated inspection equipment for pipeline circumferential welds has emerged. For example, a pipeline inspection system disclosed in utility model patent CN111413407B includes a strip track, a traveling mechanism, an X-ray machine, a detector, and an ultrasonic flaw detector. The traveling mechanism moves along the strip track to drive the relevant inspection components to inspect the pipeline circumferential welds.

[0004] The flaw detector is a crucial component of this weld inspection device, positioned opposite the X-ray machine. To prevent friction between the flaw detector and the outer wall of the pipe during movement, a certain distance must be maintained between the flaw detector and the pipe's outer wall. However, during weld inspection, external objects can become lodged in this gap, damaging the flaw detector and affecting the safe operation of the weld inspection device. Utility Model Content

[0005] In view of this, the present invention proposes a pipe annular weld inspection device, which can protect the imaging plate and ensure the safe operation of the weld inspection device.

[0006] The technical solution of this utility model is implemented as follows: This utility model provides a pipe circumferential weld inspection device, including a guide rail, a traveling mechanism, and a radiographic imaging mechanism. The guide rail is used to be fixed around the periphery of a metal pipe. The traveling mechanism is disposed on the guide rail and can move along the guide rail. The radiographic imaging mechanism includes an imaging plate, multiple side ribs, a protective plate, and bolts. The imaging plate is fixedly disposed on the traveling mechanism and corresponds to the position of the weld. The side ribs are integrally formed on the periphery of the imaging plate, and threaded holes are provided at the connection points between the side ribs and the imaging plate. The protective plate abuts against the imaging plate. The bolts pass through the protective plate and are connected to the threaded holes via threaded engagement. The bolts abut against the protective plate to fix the protective plate and the imaging plate.

[0007] Based on the above technical solutions, preferably, the side ribs are spaced apart from the protective plate.

[0008] More preferably, the threaded hole includes a first enclosing groove and a second enclosing groove, wherein the first enclosing groove is formed on the imaging plate; the second enclosing groove is formed on the side rib, the second enclosing groove and the first enclosing groove enclose to form the threaded hole, and the cross-sectional area of ​​the second enclosing groove is not greater than the cross-sectional area of ​​the first enclosing groove.

[0009] Based on the above technical solutions, preferably, the walking mechanism includes a frame, multiple fixed wheels and movable wheels, wherein the fixed wheels are rotatably mounted on the frame; the movable wheels are rotatably mounted on the frame, and the distance between the movable wheels and the fixed wheels is adjustable.

[0010] More preferably, the frame includes a frame body, a rotating base, an adjusting handle, and a gas spring, wherein the imaging plate is fixedly mounted on the frame body, and the fixed wheel is rotatably mounted on the frame body; the rotating base is rotatably mounted on the frame body, and the movable wheel is rotatably mounted on the rotating base, and the rotation axis of the rotating base does not coincide with the rotation axis of the movable wheel; the adjusting handle is rotatably mounted on the frame body; and the gas spring is rotatably mounted between the adjusting handle and the rotating base.

[0011] More preferably, the frame includes two curvature adjustment plates, a battery box, and a control box, wherein the two curvature adjustment plates are arranged parallel and spaced apart; the battery box and the control box are both fixedly arranged between the two curvature adjustment plates, the battery box and the control box are arranged opposite to each other, and the battery box and the control box are respectively provided with a fixed wheel and a movable wheel.

[0012] More preferably, the fixed wheel has a gear-shaped structure; the guide rail has toothed grooves, and the fixed wheel meshes with the guide rail.

[0013] More preferably, the relative position of the imaging plate and the frame is adjustable to adjust the distance between the imaging plate and the metal pipe.

[0014] Based on the above technical solutions, preferably, the X-ray imaging mechanism further includes a balance wheel, which is rotatably disposed on the side of the imaging plate away from the walking mechanism and abuts against the side wall of the metal pipe.

[0015] Based on the above technical solutions, preferably, the system also includes a wireless network transmission module and a touch screen, wherein the wireless network transmission module is disposed on the walking mechanism or the X-ray imaging mechanism; and the touch screen is fixedly disposed on the walking mechanism.

[0016] The pipe circumferential weld inspection device of this utility model has the following advantages over the prior art:

[0017] (1) By setting side ribs on the periphery of the imaging plate and opening threaded holes at the connection between the side ribs and the imaging plate, the protective plate can be installed on the side of the imaging plate close to the metal pipe to protect the imaging plate, and the space occupied by the imaging plate shell can be reduced and the heat dissipation performance of the imaging plate can be improved.

[0018] (2) By spacing the side ribs and the protective plate apart, the position of the bolts and the installation status of the protective plate can be observed in real time when the bolts are installed, which improves the assembly efficiency of the X-ray imaging mechanism. In addition, the side ribs can be squeezed and deformed when the thread in the threaded hole fails, so as to fix the protective plate in an emergency.

[0019] (3) By setting fixed wheels and movable wheels on the frame and making the distance between them adjustable, the walking mechanism can be easily installed on the guide rail. By setting gear-shaped fixed wheels and setting tooth grooves on the guide rail, the movement stability of the walking mechanism can be improved.

[0020] (4) By setting a curvature adjustment plate and making the relative position of the imaging plate and the frame adjustable, this detection device can be adapted to metal pipes of different specifications, thereby improving the adaptability of this detection device.

[0021] (5) By setting up a touch screen, the detection device can be directly controlled without the need for external equipment. By setting up a wireless network transmission module, the relevant components of the detection device can be directly connected to the network, which improves the practicality of the detection device. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of a pipe circumferential weld inspection device according to the present invention.

[0024] Figure 2This is a perspective view of the traveling mechanism and the X-ray imaging mechanism in a pipe annular weld inspection device of this utility model.

[0025] Figure 3 This is a front view of the X-ray imaging mechanism in a pipe annular weld inspection device of this utility model.

[0026] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0027] Figure 5 This is a bottom view of the threaded hole in a pipe annular weld inspection device of this utility model.

[0028] Figure 6 This is a perspective view of the traveling mechanism in a pipe annular weld inspection device of this utility model.

[0029] Figure 7 This is a bottom view of the frame in a pipe annular weld inspection device according to the present invention.

[0030] Figure 8 This is a front view of the fixed wheel in a pipe annular weld inspection device of this utility model.

[0031] Figure 9 This is a perspective view of the guide rail in a pipe annular weld inspection device according to this utility model.

[0032] The components include: 1. Guide rail; 101. Toothed groove; 2. Walking mechanism; 21. Frame; 22. Fixed wheel; 23. Movable wheel; 211. Frame body; 212. Rotary seat; 213. Adjustment handle; 214. Gas spring; 2111. Curvature adjustment plate; 2112. Battery box; 2113. Control box; 3. X-ray imaging mechanism; 31. Imaging plate; 32. Side rib; 33. Protective plate; 34. Bolt; 35. Balance wheel; 301. Threaded hole; 3011. First enclosing groove; 3012. Second enclosing groove; 4. Metal pipe; 401. Weld. Detailed Implementation

[0033] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. 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.

[0034] Metal pipes 4 are widely used in industries such as petroleum, natural gas, and chemicals, serving to transport materials. The material of the metal pipe 4 is selected according to the different media being transported, such as carbon steel and stainless steel. To improve the corrosion resistance of the metal pipe 4, a protective layer is coated on its outer wall.

[0035] Since the material conveying distance is usually long and the length of a single steel pipe is limited, it is necessary to use welding to connect multiple steel pipes to meet the length requirements of the actual project. The connection position of two adjacent steel pipes will generate a ring weld 401.

[0036] If welding parameters are not properly controlled or the operation is not standardized during the welding process, defects such as cracks, slag inclusions, and lack of fusion may occur, which will damage the structural strength and sealing of the metal pipe 4 and affect the material transportation.

[0037] This utility model discloses a pipe circumferential weld inspection device, which includes a guide rail 1, a traveling mechanism 2, a radiographic imaging mechanism 3 and a radiographic generating device. It uses the DR (Digital Radiography) principle to inspect the weld 401.

[0038] The X-ray imaging mechanism 3 and the X-ray generating device are set opposite to each other about the axis of the metal pipe 4. The X-rays emitted by the X-ray generating device penetrate the weld 401 and are received by the X-ray imaging mechanism 3. The digital-to-electrical conversion is used to form an image that can reflect the state of the weld 401, thereby realizing non-destructive testing of the weld 401.

[0039] like Figure 1 As shown, the guide rail 1 is fixed around the periphery of the metal pipe 4 and located next to the weld 401. The traveling mechanism 2 is set on the guide rail 1. There are two traveling mechanisms 2. One traveling mechanism 2 is fixedly equipped with a X-ray imaging mechanism 3, and the other traveling mechanism 2 is fixedly equipped with a X-ray generating device. The two traveling mechanisms 2 move synchronously on the guide rail 1, so that the X-ray imaging mechanism 3 can receive complete information about the weld 401 and perform comprehensive inspection of the annular weld 401.

[0040] like Figure 9 As shown, the guide rail 1 consists of a steel strip and connectors. The steel strip is flexible and can be bent to fit around the metal pipe 4. After the steel strip is bent and fitted to the periphery, the connectors are used to tighten both ends of the steel strip, thus fixing the steel strip to the metal pipe 4. At this time, the guide rail 1 provides a circular movement path for the traveling mechanism 2, allowing the traveling mechanism 2 to move along the circular path.

[0041] The outer diameter of the metal pipe 4 is usually large. In order to improve the ease of installation of the detection device, the guide rail 1 should be installed on the metal pipe 4 first, and then the traveling mechanism 2, which is equipped with the X-ray imaging mechanism 3 and the X-ray generating device, should be installed on the guide rail 1.

[0042] like Figure 6 As shown, the walking mechanism 2 includes a frame 21, multiple fixed wheels 22 and movable wheels 23. The fixed wheels 22 and movable wheels 23 are rotatably mounted on the frame 21. The movable wheels 23 are spaced apart from the fixed wheels 22, and the distance between the movable wheels 23 and the fixed wheels 22 is adjustable. When installing the walking mechanism 2, first increase the distance between the fixed wheels 22 and the movable wheels 23 so that the distance between them is greater than the width of the guide rail 1. Then move the walking mechanism 2 to the position of the guide rail 1. Finally, decrease the distance between the fixed wheels 22 and the movable wheels 23 so that the fixed wheels 22 and the movable wheels 23 abut against the two ends of the guide rail 1, and the walking mechanism 2 can be installed on the guide rail 1.

[0043] The frame 21 has a built-in motor, and the fixed wheel 22 is connected to the output end of the motor. When the motor is started, the fixed wheel 22 can be driven to rotate. The friction between the fixed wheel 22 and the guide rail 1 drives the walking mechanism 2 to move on the guide rail 1.

[0044] Since the X-ray imaging mechanism 3 and the X-ray generating device are relatively heavy, in order to prevent the walking mechanism 2 from slipping when moving on the guide rail 1, it is preferable to open a toothed groove 101 on the guide rail 1 and set the fixed wheel 22 as a gear so that the fixed wheel 22 meshes with the guide rail 1, thereby improving the movement stability of the walking mechanism 2 and the connection reliability between the walking mechanism 2 and the guide rail 1.

[0045] In one preferred embodiment, the frame 21 includes a frame body 211, a swivel base 212, an adjusting handle 213, and a gas spring 214, such as Figure 2 and Figure 7 As shown, the imaging plate 31 is fixedly mounted on the frame 211, the fixed wheel 22 is rotatably mounted on the frame 211, the rotating base 212 is rotatably mounted on the frame 211, and the movable wheel 23 is rotatably mounted on the rotating base 212. The rotation axis of the rotating base 212 and the rotation axis of the movable wheel 23 do not coincide. When the rotating base 212 is rotated, the movable wheel 23 can rotate around the rotation axis of the rotating base 212, thereby adjusting the distance between the movable wheel 23 and the fixed wheel 22.

[0046] The adjusting handle 213 is rotatably mounted on the frame 211, and the gas spring 214 is rotatably mounted between the adjusting handle 213 and the rotating base 212. Figure 7As shown, when the adjusting handle 213 is turned counterclockwise, the rotating base 212 will rotate counterclockwise, thereby increasing the distance between the movable wheel 23 and the fixed wheel 22, making the distance between the movable wheel 23 and the fixed wheel 22 greater than the width of the guide rail 1, so that the traveling mechanism 2 can be installed on the guide rail 1; when the fixed wheel 22 and the movable wheel 23 are located on both sides of the guide rail 1, as Figure 7 As shown, rotating the adjustment handle 213 clockwise causes the movable wheel 23 and the fixed wheel 22 to press against the guide rail 1. By limiting the connection positions of the gas spring 214 and the adjustment handle 213 and the frame 211, when the guide rail 1 is located between the movable wheel 23 and the fixed wheel 22, the gas spring 214 will apply a spring force to the swivel seat 212, thereby making the movable wheel 23 tightly adhere to the guide rail 1, thus improving the connection reliability between the walking mechanism 2 and the guide rail 1.

[0047] The frame 211 includes two curvature adjustment plates 2111, a battery box 2112, and a control box 2113. The control box 2113 contains relevant control circuits and signal conversion circuits, and the battery box 2112 contains quick-release batteries to power the relevant components.

[0048] like Figure 2 and Figure 6 As shown, two curvature adjustment plates 2111 are arranged in parallel and spaced apart. The battery box 2112 and the control box 2113 are both fixedly arranged between the two curvature adjustment plates 2111. The battery box 2112 and the control box 2113 are arranged opposite each other, and their weights are equivalent to maintain the balance of the walking mechanism 2.

[0049] A fixed wheel 22 and a movable wheel 23 are respectively provided on the battery box 2112 and the control box 2113, with the fixed wheel 22 and the movable wheel 23 corresponding one-to-one.

[0050] The curvature adjustment plate 2111 is an arc-shaped plate mechanism. By setting the curvature of the curvature adjustment plate 2111, the battery box 2112 and the control box 2113 can be tilted accordingly so that the angle between the two fixed wheels 22 and the two movable wheels 23 adapts to the curvature of the guide rail 1, that is, the walking mechanism 2 adapts to the outer diameter of the metal pipe 4 to be detected.

[0051] When the specifications of the metal pipe 4 being inspected change, the radius of the guide rail 1 will change. It is necessary not only to select a curvature adjustment plate 2111 with the corresponding arc to adjust the tilt angle of the battery box 2112 and the control box 2113 so that the fixed wheel 22 and the movable wheel 23 are adapted to the arc of the guide rail 1, but also to adjust the distance between the X-ray imaging mechanism 3 and the metal pipe 4, so as to ensure that this inspection device can inspect the weld 401 of metal pipes 4 of different specifications.

[0052] To enhance the practicality of the testing device, a wireless network transmission module and a touch screen are also provided. The wireless network transmission module is built into the walking mechanism 2 or the X-ray imaging mechanism 3 and is electrically connected to the relevant circuits, allowing the relevant components of the testing device to be directly connected to the network, thus solving network problems caused by on-site interference or excessive distance.

[0053] The touch screen is fixedly mounted on the control box 2113 on the walking mechanism 2, and is electrically connected to the control circuit and information acquisition module inside the control box 2113. It can not only display the corresponding acquisition information and the operating status of the device through the touch screen, but also directly start or control the detection device through the touch screen, which greatly improves the ease of use of the detection device.

[0054] The X-ray imaging mechanism 3 includes an imaging plate 31, multiple side ribs 32, a protective plate 33, bolts 34, and a balance wheel 35. The imaging plate 31 is used to receive the X-rays emitted by the X-ray generating device. The imaging plate 31 is fixedly mounted on the traveling mechanism 2 and corresponds to the position of the weld 401. The protective plate 33 is mounted on the imaging plate 31 and is used to protect the side of the imaging plate 31 that is close to the metal pipe 4, so as to prevent sand and other objects from splashing into the space between the imaging plate 31 and the metal pipe 4 and causing damage to the imaging plate 31.

[0055] When it is necessary to adjust the distance between the X-ray imaging mechanism 3 and the metal pipe 4, it is only necessary to adjust the distance between the imaging plate 31 and the metal pipe 4. For example, the relative position of the imaging plate 31 and the frame 211 can be adjusted by using structures such as elongated holes.

[0056] Side ribs 32 and bolts 34 provide mounting space for the protective plate 33. Side ribs 32 are fixedly mounted on the periphery of the imaging plate 31. Threaded holes 301 are provided at the connection between the side ribs 32 and the imaging plate 31. Figure 4 As shown, the protective plate 33 is abutted against the imaging plate 31, and the bolt 34 passes through the protective plate 33 and is connected to the threaded hole 301 by threaded engagement. The bolt head of the bolt 34 abuts against the side of the protective plate 33 away from the imaging plate 31, thereby fixing the protective plate 33 and the imaging plate 31.

[0057] To facilitate the processing of the side ribs 32, it is preferable to integrally form the side ribs 32 with the imaging plate 31.

[0058] The side rib 32 provides space for the threaded hole 301, which not only avoids interference between the threaded hole 301 and related components inside the imaging plate 31, but also reduces the overall space occupied by the X-ray imaging mechanism 3, which helps to achieve a lightweight design of the X-ray imaging mechanism 3, making the detection device easier to carry and transport.

[0059] like Figure 2 and Figure 3As shown, the side ribs 32 are longitudinally protruding structures, which can act as reinforcing ribs to improve the structural strength of the imaging plate 31, thus enhancing its protective effect and extending its service life. At the same time, the side ribs 32 also increase the heat dissipation area of ​​the imaging plate 31, providing a better heat dissipation effect.

[0060] like Figure 5 As shown, the middle part of the side rib 32 is a circular part, and the two ends of the side rib 32 are arc-shaped parts. One end of the arc-shaped part is tangent to the circular part, and the other end is tangent to the imaging plate 31, forming a continuous and smooth surface. This not only helps to increase the heat dissipation area, but also helps to protect the operator and avoid scratching the operator.

[0061] like Figure 4 As shown, the side ribs 32 and the protective plate 33 are spaced apart. When the bolts 34 are rotated to fix the protective plate 33, the position of the bolts 34 can be observed in real time through the gap between the side ribs 32 and the protective plate 33, so that the bolts 34 can be quickly aligned with the threaded holes 301, improving the installation efficiency of the bolts 34 and the protective plate 33. When the bolts 34 are tightened, if the bolts 34 are screwed into the threaded holes 301 to a greater depth, the protective plate 33 will bend towards the gap, without the bolts 34 damaging the protective plate 33. At the same time, the resistance of the bolts 34 to the protective plate 33 can be observed through the gap, so that the installed protective plate 33 does not bend, but adheres to the imaging plate 31.

[0062] The reliability of threaded connection is not very high. During the use of the device, problems such as stripping of bolt 34 and threaded hole 301 occur. If the device is repaired, it will affect the inspection progress of metal pipe 4 and the inspection period.

[0063] When the above-mentioned thread failure phenomena such as stripping occur, such as Figure 4 As shown, the bolt 34 can be manually inserted into the threaded hole 301 and held against the lower side of the protective plate 33. Then, a tool can be used to tap the lower side of the side rib 32 to deform it and clamp the bolt 34, thereby achieving emergency fixation of the protective plate 33.

[0064] The structure of the protruding side rib 32 is relatively weak, making it more susceptible to deformation from being struck. Furthermore, there is a gap between the end of the side rib 32 and the protective plate 33, so striking it will not damage the protective plate 33.

[0065] like Figure 5As shown, the threaded hole 301 includes a first enclosing groove 3011 and a second enclosing groove 3012. The first enclosing groove 3011 is formed on the imaging plate 31, and the second enclosing groove 3012 is formed on the side rib 32. The second enclosing groove 3012 and the first enclosing groove 3011 enclose to form the threaded hole 301. The cross-sectional area of ​​the second enclosing groove 3012 is not greater than the cross-sectional area of ​​the first enclosing groove 3011, thereby allowing the bolt 34 to have a better connection with the imaging plate 31, which has a greater structural strength.

[0066] like Figure 2 and Figure 3 As shown, one side of the imaging plate 31 is connected to the walking mechanism 2 to form a cantilever structure. The balance wheel 35 is rotatably set on the side of the imaging plate 31 away from the walking mechanism 2 and abuts against the side wall of the metal pipe 4, thereby protecting the imaging plate 31 and preventing the imaging plate 31 from contacting the side wall of the metal pipe 4.

[0067] The outer shell of each component of this testing device is made of aluminum alloy in one piece, which not only further improves the portability of the testing device, but also protects the relevant components, solves the heat dissipation problem of the device, and ensures the normal operation of the device in high-temperature environments.

[0068] The method of using the pipeline circumferential weld inspection device of this utility model is as follows:

[0069] S1, fix the guide rail 1 around the metal pipe 4, and position the guide rail 1 on one side of the weld 401.

[0070] S2, increase the distance between the movable wheel 23 and the fixed wheel 22 by rotating the adjustment handle 213, then place the walking mechanism 2 on the guide rail 1, and rotate the adjustment handle 213 in the opposite direction so that the movable wheel 23 abuts against the guide rail 1, thereby fixing the walking mechanism 2 to the guide rail 1.

[0071] S3, repeat S2, fix the traveling mechanism 2 with the X-ray imaging mechanism 3 and the traveling mechanism 2 with the X-ray generating device on the guide rail 1 respectively, and set the X-ray imaging mechanism 3 and the X-ray generating device relative to each other about the axis of the metal pipe 4.

[0072] S4, start the walking mechanism 2, so that the two walking mechanisms 2 rotate synchronously along the guide rail 1 to inspect the annular weld 401.

[0073] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pipe girth weld inspection apparatus, characterized by: It includes a guide rail (1), a walking mechanism (2), and a X-ray imaging mechanism (3), wherein, The guide rail (1) is used to surround and fix the metal pipe (4) around its periphery; The walking mechanism (2) is mounted on the guide rail (1) and can move along the guide rail (1); The X-ray imaging mechanism (3) includes an imaging plate (31), multiple side ribs (32), a protective plate (33), and bolts (34). The imaging plate (31) is fixedly mounted on the traveling mechanism (2) and corresponds to the position of the weld (401). The side ribs (32) are integrally formed on the periphery of the imaging plate (31), and a threaded hole (301) is provided at the connection between the side ribs (32) and the imaging plate (31). The protective plate (33) is abutted against the imaging plate (31). The bolts (34) pass through the protective plate (33) and are connected to the threaded hole (301) by threaded engagement. The bolts (34) abut against the protective plate (33) to fix the protective plate (33) and the imaging plate (31).

2. A pipe girth weld inspection apparatus as defined in claim 1, wherein: The side ribs (32) are spaced apart from the protective plate (33).

3. A pipe girth weld inspection apparatus as defined in claim 2, wherein: The threaded hole (301) includes a first enclosing groove (3011) and a second enclosing groove (3012), wherein, The first enclosing groove (3011) is formed on the imaging plate (31); The second enclosing groove (3012) is formed on the side rib (32). The second enclosing groove (3012) and the first enclosing groove (3011) enclose to form the threaded hole (301), and the cross-sectional area of ​​the second enclosing groove (3012) is not greater than the cross-sectional area of ​​the first enclosing groove (3011).

4. A pipe girth weld inspection apparatus as defined in claim 1, wherein: The walking mechanism (2) includes a frame (21), multiple fixed wheels (22) and movable wheels (23), wherein, The fixed wheel (22) is rotatably mounted on the frame (21); The movable wheel (23) is rotatably mounted on the frame (21), and the distance between the movable wheel (23) and the fixed wheel (22) is adjustable.

5. A pipe girth weld inspection apparatus as defined in claim 4, wherein: The frame (21) includes a frame body (211), a swivel base (212), an adjusting handle (213), and a gas spring (214), wherein, The imaging plate (31) is fixedly mounted on the frame (211), and the fixed wheel (22) is rotatably mounted on the frame (211); The rotating base (212) is rotatably mounted on the frame (211), and the movable wheel (23) is rotatably mounted on the rotating base (212), and the rotation axis of the rotating base (212) does not coincide with the rotation axis of the movable wheel (23); The adjustment handle (213) is rotatably mounted on the frame (211); The gas spring (214) is rotatably disposed between the adjusting handle (213) and the rotating base (212).

6. A pipe girth weld inspection apparatus as defined in claim 5, wherein: The frame (211) includes two curvature adjustment plates (2111), a battery box (2112), and a control box (2113), wherein, The two curvature adjustment plates (2111) are arranged in parallel and at intervals; The battery box (2112) and the control box (2113) are fixedly arranged between the two curvature adjusting plates (2111), the battery box (2112) is arranged opposite to the control box (2113), and one fixing wheel (22) and one movable wheel (23) are arranged on the battery box (2112) and the control box (2113) respectively.

7. A pipe girth weld inspection apparatus as defined in claim 5, wherein: The fixing wheel (22) is a gear structure. The guide rail (1) is provided with a gear groove (101), and the fixing wheel (22) is engaged with the guide rail (1).

8. A pipe girth weld inspection apparatus as defined in claim 6, wherein: The relative position of the imaging plate (31) and the frame body (211) is adjustable, so as to adjust the distance between the imaging plate (31) and the metal pipeline (4).

9. A pipe girth weld inspection apparatus as defined in claim 1, wherein: The ray imaging mechanism (3) further comprises a balance wheel (35), which is rotatably arranged on the side of the imaging plate (31) away from the walking mechanism (2) and abuts against the side wall of the metal pipeline (4).

10. A pipe girth weld inspection apparatus as defined in claim 1, wherein: Further comprising a wireless network transmission module and a touch display screen, wherein, The wireless network transmission module is arranged on the walking mechanism (2) or the ray imaging mechanism (3); The touch display screen is fixedly arranged on the walking mechanism (2).

Images