Pipeline circumferential weld detection device

Abstract

The invention relates to the technical field of pipeline welding seam detection, and provides a pipeline circumferential welding seam detection device which comprises a guide rail, a walking mechanism and a ray imaging mechanism. The ray imaging mechanism comprises an imaging plate, a plurality of side ribs, a protection plate and bolts, and the imaging plate is fixedly arranged on the walking mechanism; the side ribs are integrally formed on the peripheral side of the imaging plate, and threaded holes are formed in the connecting positions of the side ribs and the imaging plate; the protection plate is arranged on the imaging plate in an abutting mode. The bolt penetrates through the protection plate and is connected into the threaded hole in a threaded fit mode, and the bolt abuts against the protection plate. The side ribs are arranged on the peripheral side of the imaging plate, the threaded holes are formed in the connecting positions of the side ribs and the imaging plate, the protection plate can be installed on the side, close to the metal pipeline, of the imaging plate to protect the imaging plate, the occupied space of an imaging plate shell can be reduced, and the heat dissipation performance of the imaging plate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline weld detection, and in particular to a pipeline annular weld detection device. Background Art

[0002] In industries like petroleum, natural gas, and chemicals, pipelines are the primary means of material transportation, and their safety and reliability are crucial. Pipeline systems are typically constructed from long sections of steel pipe connected by welding to form continuous material transmission channels. Circumferential welds are prone to defects such as cracks, slag inclusions, and lack of fusion. These defects directly affect the overall strength and sealing performance of the pipeline. In severe cases, they can lead to material leaks and even safety accidents. Therefore, the inspection of pipeline circular welds is essential.

[0003] To improve the efficiency and accuracy of pipeline girth weld inspection while reducing inspection costs, automated pipeline girth weld inspection equipment has emerged. For example, Patent Publication No. CN111413407B discloses a pipeline inspection system that incorporates a belt track, a travel mechanism, a radiograph, a detector, and an ultrasonic flaw detector. The travel mechanism moves along the belt track, driving the associated inspection components to inspect the pipeline's girth weld.

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

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

[0006] The technical solution of the present invention is implemented as follows: The present invention provides a pipeline annular weld detection device, including a guide rail, a traveling mechanism and a radiographic imaging mechanism, wherein the guide rail is used to be fixed around the circumference of the metal pipe; the traveling mechanism is arranged 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 a bolt, and the imaging plate is fixed on the traveling mechanism and corresponds to the position of the weld; the side ribs are integrally formed on the circumference of the imaging plate, and a threaded hole is provided at the connection between the side ribs and the imaging plate; the protective plate is abutted against the imaging plate; the bolt passes through the protective plate and is connected to the threaded hole by threaded cooperation, and the bolt abuts the protective plate to fix the protective plate and the imaging plate.

[0007] On the basis of the above technical solution, preferably, the side ribs and the protection plate are spaced apart.

[0008] Further preferably, the threaded hole includes a first enclosing groove and a second enclosing groove, wherein the first enclosing groove is opened on the imaging plate; the second enclosing groove is opened 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] On the basis of the above technical solution, preferably, the walking mechanism includes a frame, a plurality of fixed wheels and a movable wheel, wherein the fixed wheels are rotatably arranged on the frame; the movable wheels are rotatably arranged on the frame, and the distance between the movable wheels and the fixed wheels is adjustable.

[0010] Further preferably, the frame includes a frame body, a swivel seat, an adjustment handle and a gas spring, wherein the imaging plate is fixedly arranged on the frame body, and the fixed wheel is rotatably arranged on the frame body; the swivel seat is rotatably arranged on the frame body, and the movable wheel is rotatably arranged on the swivel seat, and the rotation axis of the swivel seat and the rotation axis of the movable wheel do not coincide with each other; the adjustment handle is rotatably arranged on the frame body; and the gas spring is rotatably arranged between the adjustment handle and the swivel seat.

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

[0012] More preferably, the fixed wheel is a gear-shaped structure; a tooth groove is provided on the guide rail, and the fixed wheel is engaged 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] On the basis of the above technical solution, preferably, the radiographic imaging mechanism further comprises a balance wheel, which is rotatably arranged on a side of the imaging plate away from the traveling mechanism and abuts against a side wall of the metal pipe.

[0015] On the basis of the above technical solution, preferably, it further includes a wireless network transmission module and a touch display screen, wherein the wireless network transmission module is arranged on the walking mechanism or the radiation imaging mechanism; the touch display screen is fixedly arranged on the walking mechanism.

[0016] The pipeline annular weld detection device of the present invention has the following beneficial effects compared with the prior art:

[0017] (1) By providing side ribs on the circumference of the imaging plate and opening threaded holes at the connection between the side ribs and the imaging plate, not only can the protective plate be installed on the side of the imaging plate close to the metal pipe to protect the imaging plate, but the space occupied by the imaging plate housing can also be reduced and the heat dissipation performance of the imaging plate can be improved.

[0018] (2) By spacing the side ribs a certain distance from the protective plate, not only can the position of the bolts and the installation status of the protective plate be observed in real time when the bolts are installed, thereby improving the assembly efficiency of the radiographic imaging mechanism, but the side ribs can also be squeezed and deformed when the threads in the threaded hole fail, thereby performing emergency fixation on the protective plate.

[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 tooth grooves on the guide rail, the moving stability of the walking mechanism can be improved.

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

[0021] (5) By setting up a touch screen, the detection device can be directly operated without the help of external devices. By setting up a wireless network transmission module, the relevant components of the detection device can be directly connected to the network, thereby improving the practicality of the detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a three-dimensional diagram of a pipeline annular weld detection device of the present invention.

[0024] Figure 2 It is a three-dimensional diagram of the traveling mechanism and the radiographic imaging mechanism in a pipeline annular weld detection device of the present invention.

[0025] Figure 3 The figure is a front view of a radiographic imaging mechanism in a pipeline annular weld detection device according to the present invention.

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

[0027] Figure 5 The present invention is a bottom view of a threaded hole in a pipeline annular weld detection device.

[0028] Figure 6 The figure is a three-dimensional diagram of the traveling mechanism in a pipeline annular weld detection device according to the present invention.

[0029] Figure 7 The present invention is a bottom view of a frame of a pipeline annular weld detection device.

[0030] Figure 8 This is a front view of a fixed wheel in a pipeline annular weld detection device according to the present invention.

[0031] Figure 9 The figure is a three-dimensional diagram of a guide rail in a pipeline annular weld detection device according to the present invention.

[0032] Among them: 1. Guide rail; 101. Tooth groove; 2. Travel mechanism; 21. Frame; 22. Fixed wheel; 23. Movable wheel; 211. Frame; 212. Swivel 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 DESCRIPTION

[0033] The following will be combined with the specific embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0034] Metal pipes 4 are widely used in industries such as petroleum, natural gas, and chemicals to transport materials. The material of these pipes varies depending on the medium being transported, such as carbon steel or stainless steel. To enhance their corrosion resistance, they are often coated with a protective layer.

[0035] Since the material transportation distance is usually long and the length of a single steel pipe is limited, multiple steel pipes need to be connected by welding to meet the length requirements of the actual project. A circular weld 401 is generated at the connection position of two adjacent steel pipes.

[0036] During the welding process, if the welding parameters are improperly controlled or the operation is not standardized, defects such as cracks, slag inclusions, and lack of fusion may occur, causing damage to the structural strength and sealing of the metal pipe 4, affecting the transportation of materials.

[0037] A pipeline annular weld detection device of the present invention comprises a guide rail 1, a traveling mechanism 2, a radiographic imaging mechanism 3 and a ray generating device, and uses the DR detection (Digital Radiography) principle to detect the weld 401.

[0038] The radiographic imaging mechanism 3 and the radiation generating device are arranged relative to the axis of the metal pipe 4. The X-rays emitted by the radiation generating device penetrate the weld 401 and are received by the radiographic imaging mechanism 3. An image that can reflect the state of the weld 401 is formed by digital-to-electrical conversion, thereby realizing non-destructive testing of the weld 401.

[0039] like Figure 1 As shown, the guide rail 1 is fixed around the circumference of the metal pipe 4 and is located next to the weld 401. The walking mechanism 2 is set on the guide rail 1. There are two walking mechanisms 2. A radiographic imaging mechanism 3 is fixed on one walking mechanism 2, and a radiation generating device is fixed on the other walking mechanism 2. The two walking mechanisms 2 move synchronously on the guide rail 1, so that the radiographic imaging mechanism 3 can receive complete weld 401 information to perform a comprehensive inspection of the annular weld 401.

[0040] like Figure 9 As shown, the guide rail 1 is composed of a steel belt and connectors. The steel belt is bendable and fits around the circumference of the metal pipe 4. The connectors are used to tighten the ends of the steel belt to secure it to the metal pipe 4. The guide rail 1 then provides a circular 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 installation convenience of the detection device, the guide rail 1 should be installed on the metal pipe 4 first, and then the walking mechanism 2 equipped with the radiation imaging mechanism 3 and the radiation generating device should be installed on the guide rail 1.

[0042] like Figure 6As shown, the walking mechanism 2 includes a frame 21, a plurality of fixed wheels 22 and a movable wheel 23. The fixed wheels 22 and the movable wheels 23 are both rotatably set 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 the two is greater than the width of the guide rail 1, then move the walking mechanism 2 to the position of the guide rail 1, and finally reduce the distance between the fixed wheels 22 and the movable wheels 23 so that the fixed wheels 22 and the movable wheels 23 are against the two ends of the guide rail 1, and then the walking mechanism 2 can be installed on the guide rail 1.

[0043] The frame 21 is equipped with a motor, and the fixed wheel 22 is connected to the output end of the motor. When the motor is started, the fixed wheel 22 is driven to rotate, and the friction between the fixed wheel 22 and the guide rail 1 is used to drive the walking mechanism 2 to move on the guide rail 1.

[0044] The radiation imaging mechanism 3 and the radiation generating device are heavy. In order to prevent the traveling mechanism 2 from slipping when moving on the guide rail 1, it is preferred to open a circle of tooth grooves 101 on the guide rail 1, set the fixed wheel 22 as a gear, and let the fixed wheel 22 engage with the guide rail 1, thereby improving the movement stability of the traveling mechanism 2 and the connection reliability of the traveling mechanism 2 and the guide rail 1.

[0045] As a preferred embodiment, the frame 21 includes a frame body 211, a rotating seat 212, an adjustment handle 213 and a gas spring 214. Figure 2 and Figure 7 As shown, the imaging plate 31 is fixedly arranged on the frame 211, the fixed wheel 22 is rotatably arranged on the frame 211, the rotating seat 212 is rotatably arranged on the frame 211, and the movable wheel 23 is rotatably arranged on the rotating seat 212. The rotating axis of the rotating seat 212 does not coincide with the rotating axis of the movable wheel 23. When the rotating seat 212 is rotated, the movable wheel 23 can be rotated around the rotating axis of the rotating seat 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 seat 212. Figure 7 As shown, when the adjustment handle 213 is rotated counterclockwise, the swivel seat 212 is driven to rotate counterclockwise, thereby increasing the distance between the movable wheel 23 and the fixed wheel 22, so that the distance between the movable wheel 23 and the fixed wheel 22 is greater than the width of the guide rail 1, so that the walking mechanism 2 is 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 shown in FIG. Figure 7As shown, by rotating the adjusting handle 213 clockwise, the movable wheel 23 and the fixed wheel 22 can squeeze the guide rail 1; wherein, by limiting the connection position between the gas spring 214 and the adjusting handle 213 and the connection position between the adjusting 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 elastic force to the swivel seat 212, so that the movable wheel 23 is close to the guide rail 1, so as to improve 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 is installed with relevant control circuits and signal conversion circuits. The battery box 2112 is installed with quick-release batteries to power relevant components.

[0048] like Figure 2 and Figure 6 As shown, the two curvature adjustment plates 2111 are parallel and spaced apart, the battery box 2112 and the control box 2113 are fixedly arranged between the two curvature adjustment plates 2111, and the battery box 2112 and the control box 2113 are arranged opposite to each other, and their weights are comparable 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 , and the fixed wheel 22 corresponds to the movable wheel 23 one by one.

[0050] The curvature adjustment plate 2111 is an arc-shaped plate-like 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 required for detection.

[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 a corresponding curvature, but also to adjust the inclination angles of the battery box 2112 and the control box 2113 to make the fixed wheel 22 and the movable wheel 23 adapt to the curvature of the guide rail 1, but also to adjust the distance between the X-ray imaging mechanism 3 and the metal pipe 4 to ensure that the detection device can detect the welds 401 of metal pipes 4 of different specifications.

[0052] In order to improve the practicality of the detection device, a wireless network transmission module and a touch display screen are also set up. 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, so that the relevant components of the detection device can be directly connected to the network, solving network problems caused by on-site interference or excessive distance.

[0053] The touch screen is fixedly set on the control box 2113 on the walking mechanism 2, and is electrically connected to the control circuit and information acquisition module in the control box 2113. Not only can the corresponding collection information and the operating status of the device be displayed through the touch screen, but the detection device can also be directly started or controlled through the touch screen, which greatly improves the convenience of use of the detection device.

[0054] The radiographic imaging mechanism 3 includes an imaging plate 31, a plurality of side ribs 32, a protective plate 33, a bolt 34 and a balance wheel 35. The imaging plate 31 is used to receive the radiation emitted by the radiation generating device. The imaging plate 31 is fixedly arranged on the walking mechanism 2 and corresponds to the position of the weld 401. The protective plate 33 is arranged on the imaging plate 31 to protect the side of the imaging plate 31 close to the metal pipe 4 to prevent sand and gravel 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 the distance between the radiographic imaging mechanism 3 and the metal pipe 4 needs to be adjusted, it is only necessary to adjust the distance between the imaging plate 31 and the metal pipe 4 , such as by making the relative position of the imaging plate 31 and the frame 211 adjustable, using a structure such as an oblong hole.

[0056] The side ribs 32 and the bolts 34 are used to provide installation space for the protection plate 33. The side ribs 32 are fixed on the peripheral side of the imaging plate 31. The connection between the side ribs 32 and the imaging plate 31 is provided with a threaded hole 301. Figure 4 As shown, the protective plate 33 is set against the imaging plate 31, the bolt 34 passes through the protective plate 33, and is connected to the threaded hole 301 through threaded fitting, and the screw head of the bolt 34 presses 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] In order to facilitate the processing of the side ribs 32 , it is preferred that the side ribs 32 and the imaging plate 31 are integrally formed.

[0058] The side ribs 32 provide 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 occupied space of the X-ray imaging mechanism 3, helps to achieve a lightweight design of the X-ray imaging mechanism 3, and makes the carrying and transportation of the detection device easier.

[0059] like Figure 2 and Figure 3 As shown, the side ribs 32 are longitudinal protruding structures that can act as reinforcing ribs to enhance the structural strength of the imaging board 31, thereby helping to improve the protective effect of the imaging board 31 and extend the service life of the imaging board 31. At the same time, the side ribs 32 also increase the heat dissipation area of ​​the imaging board 31, thereby achieving a good heat dissipation effect.

[0060] like Figure 5 As shown, the middle position of the side rib 32 is a circular portion, and the two end positions of the side rib 32 are arc-shaped portions. One end of the arc-shaped portion is tangent to the circular portion, and the other end is tangent to the imaging plate 31, forming a continuous and smooth surface, which is not only beneficial 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 from the space between the side ribs 32 and the protective plate 33, so that the bolts 34 can be quickly aligned with the threaded holes 301, thereby improving the installation efficiency of the bolts 34 and the protective plate 33; when the bolts 34 are tightened, if the depth of the bolts 34 screwed into the threaded holes 301 is too great, the protective plate 33 will bend toward the space, and the bolts 34 will not damage the protective plate 33. At the same time, the support of the bolts 34 to the protective plate 33 can also be observed through the space, so that the installed protective plate 33 will not bend, but will fit on the imaging plate 31.

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

[0063] When the above-mentioned thread failure phenomena such as thread stripping occur, Figure 4 As shown, the bolt 34 can be manually inserted into the threaded hole 301 and allowed to rest against the lower side of the protective plate 33. Then, a tool can be used to strike 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, and it is easier to be deformed by knocking. There is a gap between the end of the side rib 32 close to the protective plate 33 and the protective plate 33, so knocking on it will not cause damage to the protective plate 33.

[0065] like Figure 5 As shown, the threaded hole 301 includes a first enclosing groove 3011 and a second enclosing groove 3012. The first enclosing groove 3011 is opened on the imaging board 31, and the second enclosing groove 3012 is opened on the side rib 32. The second enclosing groove 3012 and the first enclosing groove 3011 are enclosed to form the threaded hole 301, and the cross-sectional area of ​​the second enclosing groove 3012 is not larger than the cross-sectional area of ​​the first enclosing groove 3011, so that the bolt 34 has a better connection with the imaging board 31 with greater structural strength.

[0066] like Figure 2 and Figure 3As shown, one side of the imaging plate 31 is connected to the traveling mechanism 2 to form a cantilever structure, and the balance wheel 35 is rotatably arranged on the side of the imaging plate 31 away from the traveling 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 shells of all components of this detection device are made of aluminum alloy material in one piece, which not only further improves the portability of the detection device, but also protects the relevant components, solves the heat dissipation problem of the device, and ensures the normal operation of the device in a high temperature environment.

[0068] The method for using the pipeline annular weld detection device of the present invention is as follows:

[0069] S1 , surround and fix the guide rail 1 on the metal pipe 4 , and place 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 to make the movable wheel 23 press against the guide rail 1, so that the walking mechanism 2 and the guide rail 1 are fixed.

[0071] S3, repeat S2, respectively fix the traveling mechanism 2 equipped with the radiographic imaging mechanism 3 and the traveling mechanism 2 equipped with the radiation generating device on the guide rail 1, and set the radiographic imaging mechanism 3 and the radiation generating device relative to the axis of the metal pipe 4.

[0072] S4, start the traveling mechanism 2, and let the two traveling mechanisms 2 rotate synchronously along the guide rail 1 to detect the annular weld 401.

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

Claims

1. A pipeline annular weld detection device, characterized in that: It comprises a guide rail (1), a walking mechanism (2) and a radiographic imaging mechanism (3), wherein: The guide rail (1) is used to be fixed around the circumference of the metal pipe (4); The walking mechanism (2) is arranged on the guide rail (1) and is capable of moving along the guide rail (1); The radiographic imaging mechanism (3) comprises an imaging plate (31), a plurality of side ribs (32), a protective plate (33) and a bolt (34); the imaging plate (31) is fixedly arranged on the walking mechanism (2) and corresponds to the position of the weld (401); the side ribs (32) are integrally formed on the peripheral side of the imaging plate (31); a threaded hole (301) is provided at the connection between the side ribs (32) and the imaging plate (31); the protective plate (33) is arranged in contact with the imaging plate (31); the bolt (34) passes through the protective plate (33) and is connected to the threaded hole (301) by threaded engagement; the bolt (34) abuts against the protective plate (33) to fix the protective plate (33) and the imaging plate (31).

2. A pipeline annular weld detection device according to claim 1, characterized in that: The side ribs (32) and the protection plate (33) are spaced apart.

3. A pipeline annular weld detection device according to claim 2, characterized in that: The threaded hole (301) comprises a first enclosing groove (3011) and a second enclosing groove (3012), wherein: The first enclosing groove (3011) is provided on the imaging plate (31); The second enclosing groove (3012) is provided 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. The pipeline annular weld detection device according to claim 1, characterized in that: The walking mechanism (2) includes a frame (21), a plurality of fixed wheels (22) and movable wheels (23), wherein: The fixed wheel (22) is rotatably arranged on the frame (21); The movable wheel (23) is rotatably arranged on the frame (21), and the distance between the movable wheel (23) and the fixed wheel (22) is adjustable.

5. The pipeline annular weld detection device according to claim 4, characterized in that: The frame (21) includes a frame body (211), a rotating seat (212), an adjustment handle (213) and a gas spring (214), wherein: The imaging plate (31) is fixedly arranged on the frame (211), and the fixed wheel (22) is rotatably arranged on the frame (211); The rotating seat (212) is rotatably mounted on the frame (211), and the movable wheel (23) is rotatably mounted on the rotating seat (212), and the rotating axis of the rotating seat (212) and the rotating axis of the movable wheel (23) do not coincide with each other; The adjusting handle (213) is rotatably arranged on the frame (211); The gas spring (214) is rotatably arranged between the adjustment handle (213) and the rotating seat (212).

6. A pipeline annular weld detection device according to claim 5, characterized in that: 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 both fixedly arranged between the two curvature adjustment plates (2111), the battery box (2112) and the control box (2113) are arranged opposite to each other, and one of the fixed wheels (22) and one of the movable wheels (23) are respectively arranged on the battery box (2112) and the control box (2113).

7. The pipeline annular weld detection device according to claim 5, characterized in that: The fixed wheel (22) is a gear-shaped structure; The guide rail (1) is provided with a tooth groove (101), and the fixed wheel (22) is engaged with the guide rail (1).

8. The pipeline annular weld detection device according to claim 6, characterized in that: The relative position of the imaging plate (31) and the frame (211) is adjustable to adjust the distance between the imaging plate (31) and the metal pipe (4).

9. The pipeline annular weld detection device according to claim 1, characterized in that: The radiographic imaging mechanism (3) further comprises a balance wheel (35), which is rotatably arranged on a side of the imaging plate (31) away from the walking mechanism (2) and abuts against a side wall of the metal pipe (4).

10. The pipeline annular weld detection device according to claim 1, characterized in that: It also includes 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 radiographic imaging mechanism (3); The touch display screen is fixedly arranged on the walking mechanism (2).

Images