Transillumination positioning device for building construction metal pipeline welding seam detection

Abstract

The invention provides a building construction metal pipeline welding seam detection transillumination positioning device, and belongs to the technical field of welding seam detection, the building construction metal pipeline welding seam detection transillumination positioning device comprises a transillumination unit, a deviation correction unit and a walking unit; the transillumination unit comprises a source seat and a ray source arranged on the source seat; the deviation rectifying unit comprises a base, a rotating disc rotationally connected to the base, a rotating piece in transmission connection to the rotating disc, a detection assembly arranged on the rotating disc and an execution assembly, the rotating piece drives the rotating disc to rotate with the first direction as a rotating shaft, and the detection assembly comprises a detection rod arranged on the rotating disc in a sliding mode and an elastic piece arranged between the detection rod and the rotating disc; one end of the detection rod abuts against the inner wall of the pipeline, the elastic piece enables the detection rod to move in the direction away from the center of the rotary disc, and the execution assembly is connected between the source base and the rotary disc and used for moving the source base. The walking unit is connected to the base and used for moving the base in the first direction. According to the invention, the detection precision of the central transillumination method and the reliability of defect detection are improved.

Description

Technical Field

[0001] This invention belongs to the technical field of weld inspection, specifically relating to a radiographic positioning device for inspecting weld seams in metal pipelines used in building construction. Background Technology

[0002] To build a complete transport network, individual pipes must be connected. This is usually done by melting metal at high temperatures to permanently fuse adjacent pipe sections together, a process known as welding. However, the welding process inevitably creates weld seams. The weld seam area is the weakest link in the pipeline structure, most prone to internal defects such as porosity, slag inclusions, lack of fusion, and cracks. Therefore, strict non-destructive testing, such as radiographic testing, is required to ensure the quality of the weld seams.

[0003] Radiographic testing is divided into two methods: double-wall single-image method, double-wall double-image method, and central radiography method. The defect detection rate of the central radiography method is higher than that of the other two methods. However, in order to ensure the accuracy of the central radiography method, the radiation source must be located at the center of the pipe cross-section.

[0004] Currently, radiographic positioning devices are commonly used to determine the location of radiation sources. These devices are positioned by three contact points that fit tightly against the inner circumference of the pipe, allowing for rapid location of the pipe's cross-section center. However, this three-point positioning method is highly dependent on the pipe's roundness. Poor pipe roundness will cause the radiation source to deviate significantly from the pipe's cross-section center, reducing the accuracy and reliability of the center radiographic method in detecting defects. Summary of the Invention

[0005] This invention provides a radiographic positioning device for inspecting weld seams in metal pipes used in building construction, aiming to solve the technical problem of low accuracy and reliability of defect detection caused by excessive offset of the X-ray source from the center of the pipe cross-section.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a radiographic positioning device for inspecting weld seams of metal pipes in building construction, comprising:

[0007] A radiographic unit includes a source base and a radiation source disposed within the source base;

[0008] A correction unit includes a base, a turntable rotatably connected to the base, a rotating component drively connected to the turntable, a detection assembly disposed on the turntable, and an execution assembly. The rotating component drives the turntable to rotate about a first direction as its rotation axis. The detection assembly includes a detection rod slidably disposed on the turntable and a spring member disposed between the detection rod and the turntable. One end of the detection rod abuts against the inner wall of a pipe, and the spring member causes the detection rod to move away from the center of the turntable. The execution assembly is connected between the source base and the turntable, and is used to move the source base.

[0009] A walking unit, connected to the base, is used to move the base along the first direction.

[0010] In one possible implementation, the detection component further includes:

[0011] A slide block is fixed to the turntable, and the slide block has two opposing sliding cavities, which are located at both ends of the slide block along the radial direction of the turntable.

[0012] Two measuring structures are respectively disposed in the two sliding cavities. Each measuring structure includes a measuring rod and an elastic element. The measuring rod is slidably connected to the slide block, and the elastic element is fixed between the measuring rod and the slide block.

[0013] A displacement sensor is installed on the detection rod to monitor the change in the position of the detection rod;

[0014] A centering frame is provided along the length of the slide block, and the center position of the centering frame is fixedly connected to the center position of the slide block. The centering frame is also connected to the actuating component; and

[0015] The centering component is connected to the centering frame via a transmission mechanism and is used to adjust the position of the centering frame along the length direction of the detection rod.

[0016] In one possible implementation, the detection component further includes:

[0017] Two connecting plates, one end of which is connected to the two detection rods respectively, and the other end of which is connected to both ends of the centering frame respectively, and the two connecting plates are equidistant from the midpoint of the centering frame;

[0018] Two clamping parts are provided one-to-one at the end of the connecting plate near the detection rod, and the clamping parts are used to fix the detection rod to the connecting plate;

[0019] Two deformation members, corresponding one-to-one with the connecting plate, are fixedly connected between the centering frame and the connecting plate. Each deformation member has a preload force that causes the connecting plate to move away from the center position of the centering frame.

[0020] A first limiting structure is provided between the centering frame and the connecting plate to fix the centering frame and the connecting plate relative to each other.

[0021] In one possible implementation, the first limiting structure includes:

[0022] Two connecting columns, one of which is rotatably connected to the centering frame, and the other of which is rotatably connected to the connecting plate. The two connecting columns are rotatably connected to each other, and the rotation axis of the connecting column is perpendicular to the plate surface of the centering frame.

[0023] A limiting piece, one end of which is slidably connected to one of the connecting posts, and the other end of which is slidably connected to the other connecting post, wherein the end of the limiting piece moves along the length direction of the connecting post; and

[0024] Two first adsorption elements are respectively disposed at both ends of the limiting piece, and the first adsorption elements are used to adsorb and fix the limiting piece to the corresponding connecting post.

[0025] In one possible implementation, the detection component further includes a second limiting structure disposed between the detection rod and the slide, the second limiting structure being used to fix the detection rod and the slide relative to each other;

[0026] The walking unit includes:

[0027] Walking seat;

[0028] A first telescopic member is fixedly connected between the walking seat and the base, and the first telescopic member extends and retracts along the first direction;

[0029] Multiple walking components are spaced apart on the outer periphery of the walking base, the walking components being used to drive the walking base to move along the first direction; and

[0030] The second telescopic member is fixed between the walking assembly and the walking seat, and the second telescopic member extends and retracts radially along the turntable.

[0031] In one possible implementation, the second limiting structure includes:

[0032] Storage tank, connected to the sliding cavity; and

[0033] A transfer component is disposed between the storage tank and the sliding cavity, for transferring fluid in the storage tank to the sliding cavity or returning fluid in the sliding cavity to the storage tank.

[0034] In one possible implementation, the walking unit also includes a vision sensor.

[0035] In one possible implementation, the detection component further includes a centering seat slidably connected to the centering frame, the centering member being used to drive the centering seat to move;

[0036] The execution component includes:

[0037] A movable seat, slidably connected to the centering seat, and the movable seat is also connected to the source seat; and

[0038] An actuator, which is connected to the movable base, is used to drive the movable base to move along the length direction of the detection rod.

[0039] In one possible implementation, the movable seat has a storage cavity, and the inner wall of the storage cavity is provided with a barrier material for blocking the transmission of rays.

[0040] The execution component also includes:

[0041] The third telescopic member has its central axis coincide with the center point of the base. The third telescopic member extends and retracts along the first direction, and the telescopic end of the third telescopic member is also connected to the source base.

[0042] A sealing plate is disposed at the port of the receiving cavity, the sealing plate being slidably connected to the movable seat, and the moving direction of the sealing plate being perpendicular to the telescopic direction of the third telescopic member; and

[0043] An opening and closing element is connected to the sealing plate and is used to drive the sealing plate to move.

[0044] In one possible implementation, the third telescopic member is provided with a second adsorption member, which is used to adsorb and fix the source seat to the third telescopic member.

[0045] The radiographic positioning device for inspecting weld seams in metal pipelines provided by this invention, compared with existing technologies, involves a detection rod rotating continuously along the inner wall of the pipeline under the action of an elastic component, completely acquiring continuous positional information of the cross-sectional profile. A computer uses a least-squares algorithm to fit the formed trajectory and calculates the actual circle that best matches the measured trajectory. The execution component adjusts the position of the X-ray source based on the actual circle's center. Even if the pipeline has ellipticity differences or local concave deformation, this invention can find an approximate circle to ensure the X-ray source coincides with the true circle's center, improving the uniformity of radiation from the source to the weld seam area, thereby enhancing the detection accuracy and defect detection reliability of the central radiographic method. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the radiographic positioning device for inspecting weld seams of metal pipes in building construction, according to an embodiment of the present invention.

[0047] Figure 2 This is a partial schematic diagram illustrating the first limiting structure in an embodiment of the present invention;

[0048] Figure 3 This is a partial cross-sectional view illustrating the second limiting structure in an embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram illustrating the structure of the execution component in an embodiment of the present invention.

[0050] In the diagram, 10 is the radiographic unit; 101 is the source base; 20 is the correction unit; 201 is the base; 202 is the turntable; 203 is the detection rod; 204 is the elastic component; 205 is the slide; 2051 is the sliding cavity; 206 is the centering frame; 207 is the centering component; 208 is the connecting plate; 209 is the clamping part; 210 is the deformable component; 211 is the connecting column; 212 is the limiting piece; 213 is the storage tank; 214 is the transfer component; 215 is the centering base; 216 is the moving base; 2161 is the storage cavity; 217 is the actuating component; 218 is the third telescopic component; 219 is the sealing plate; 30 is the walking unit; 301 is the walking base; 302 is the first telescopic component; 303 is the walking assembly; and 304 is the second telescopic component. Detailed Implementation

[0051] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0052] Please refer to the following: Figures 1 to 4 This invention describes a radiographic positioning device for inspecting weld seams in metal pipes used in building construction. The device includes a radiographic unit 10, a correction unit 20, and a traveling unit 30. The radiographic unit 10 includes a source base 101 and a radiation source disposed within the source base 101; the radiation source may be a gamma source. The correction unit 20 includes a base 201, a turntable 202 rotatably connected to the base 201, a rotating component transmitted to the turntable 202, a detection component disposed on the turntable 202, and an execution component. The rotating component drives the turntable 202 to rotate about a first direction as its rotation axis; the rotating component may be a servo motor. The motor and detection assembly include a detection rod 203 slidably mounted on a turntable 202 and a spring member 204 disposed between the detection rod 203 and the turntable 202. One end of the detection rod 203 abuts against the inner wall of the pipe. The spring member 204 causes the detection rod 203 to move away from the center of the turntable 202. The spring member 204 can be a spring or a spring rod. An execution assembly is connected between the source seat 101 and the turntable 202 and is used to move the source seat 101. A walking unit 30 is connected to the base 201 and is used to move the base 201 along a first direction.

[0053] It should be noted that the detection rod 203 includes a rod body and a position sensor and photoelectric encoder disposed at the end of the rod body. The detection rod 203 triggers a position sampling once every 1° rotation. The correction unit 20 also includes a computer, which receives position information, then draws the travel trajectory of the end of the detection rod 203 based on the position information and calculates the closest circle. The acquisition of position information and the computer processing of position information are conventional technologies, and will not be described in detail in this application.

[0054] The radiographic positioning device for inspecting weld seams in metal pipes during construction provided in this embodiment involves a walking unit 30 that moves the radiographic unit 10 and the correction unit 20 to a preset position. Then, a power unit starts, driving the turntable 202 to rotate. The turntable 202 drives the detection rod 203 to rotate. During rotation, the detection rod 203 remains in contact with the inner wall of the pipe. After one revolution, the trajectory of the end of the detection rod 203 represents the current cross-sectional circle of the pipe. The position information of the end of the detection rod 203 is transmitted to a computer for processing. The computer draws the trajectory based on the position information and calculates the closest circle. Then, the computer transmits the center position of the circle to the execution component based on the calculation result. The execution component adjusts the position of the radiation source so that the radiation source is at the actual center position.

[0055] Compared with existing technologies, the detection rod 203 rotates continuously along the inner wall of the pipe under the action of the elastic element 204, completely collecting continuous position information of the cross-sectional profile. The computer uses a least squares algorithm to fit the formed trajectory and calculates the actual circle that best matches the measured trajectory. The execution component adjusts the position of the X-ray source according to the actual circle center. In this invention, even if the pipe has ellipticity differences or local concave deformation, it can find an approximate circle to make the X-ray source coincide with the actual circle center, improving the uniformity of radiation from the radiation source to the weld area, thereby improving the detection accuracy and defect detection reliability of the center radiography method.

[0056] In some embodiments, see Figure 1 and Figure 3 The detection assembly also includes a slide 205, two measuring structures, a displacement sensor, a centering frame 206, and a centering component 207. The slide 205 is fixed to the turntable 202, and the slide 205 has two opposing sliding cavities 2051, which are located at both ends of the slide 205 along the radial direction of the turntable 202. The two measuring structures are respectively located in the two sliding cavities 2051. The measuring structures include a detection rod 203 and an elastic element 204. The detection rod 203 is slidably connected to the slide 205, and the elastic element 207... 04 is fixed between the detection rod 203 and the slide 205; a displacement sensor is installed on the detection rod 203 to monitor the change in position of the detection rod 203; the centering frame 206 is set along the length direction of the slide 205, and the center position of the centering frame 206 is fixed to the center position of the slide 205, and the centering frame 206 is also connected to the execution component; the centering component 207 is drivenly connected to the centering frame 206 and is used to adjust the position of the centering frame 206 along the length direction of the detection rod 203, and the centering component 207 can be a linear module.

[0057] After the computer obtains the true circle, it transmits a start signal to the rotating component. The rotating component, through the turntable 202, sets the two detection rods 203 along the diameter of the true circle. The initial extension lengths of the two detection rods 203 beyond the sliding cavity 2051 are the same, and the ends of the detection rods 203 are always in contact with the inner wall of the pipe. When the inner wall of the pipe experiences local depressions or deformations, the detection rods 203 will change position relative to their initial extension length. The displacement sensor captures the corresponding position change and transmits the position change amount to the computer. The computer summarizes the data and outputs an adjustment signal. After receiving the adjustment signal, the centering component 207 adjusts the position of the execution component. The amount of movement of the execution component by the centering component 207 is half of the position change of the detection rods 203, thereby ensuring that the execution component is located at the true center of the circle.

[0058] In some embodiments, see Figure 2 The detection assembly also includes two connecting plates 208, two clamping parts 209, two deformable parts 210, and a first limiting structure; one end of each of the two connecting plates 208 is connected to one of the two detection rods 203, and the other end is connected to both ends of the centering frame 206, with the two connecting plates 208 being equidistant from the midpoint of the centering frame 206; the two clamping parts 209 are correspondingly located at the ends of the connecting plates 208 near the detection rods 203, and are used to fix the detection rods 203 to the connecting plates 208. The clamping part 209 can be a gripper cylinder; two deformable parts 210 correspond one-to-one with the connecting plate 208, and the deformable parts 210 are fixed between the centering frame 206 and the connecting plate 208. The deformable parts 210 have a preload force that causes the connecting plate 208 to move away from the center position of the centering frame 206. The deformable parts 210 can be springs or spring rods with multi-stage telescopic structures; a first limiting structure is provided between the centering frame 206 and the connecting plate 208 to fix the centering frame 206 and the connecting plate 208 relatively.

[0059] The first limiting structure includes two connecting posts 211, a limiting piece 212, and two first adsorption components. One connecting post 211 is rotatably connected to the centering frame 206, and the other connecting post 211 is rotatably connected to the connecting plate 208. The two connecting posts 211 are rotatably connected to each other, and the rotation axis of the connecting post 211 is perpendicular to the plate surface of the centering frame 206. One end of the limiting piece 212 is slidably connected to one of the connecting posts 211, and the other end is slidably connected to the other connecting post 211. The end of the limiting piece 212 moves along the length of the connecting post 211. The two first adsorption components are respectively disposed at both ends of the limiting piece 212. The first adsorption components are used to adsorb and fix the limiting piece 212 to the corresponding connecting post 211. The first adsorption component can be an electric suction cup or an electromagnetic component. When the first adsorption component is an electromagnetic component, the connecting post 211 is made of ferromagnetic material.

[0060] Specifically, the connecting post 211 has a T-shaped groove, and a T-shaped block is slidably fitted inside the T-shaped groove. The limiting piece 212 is rotatably connected to the T-shaped block, and the rotation axis of the limiting piece 212 is parallel to the rotation axis of the connecting post 211.

[0061] Before radiography, the initial extension length of the detection rod 203 needs to be adjusted according to the inner diameter of the pipe. At this time, the clamping part 209 clamps and fixes the detection rod 203, and the first adsorption element is in a stopped working state. The operator moves the connecting plate 208 to adjust the initial extension length of the detection rod 203. When the initial extension length of the detection rod 203 reaches the preset value, the first adsorption element is activated, so that the limiting piece 212 adsorbs and fixes the connecting column 211, thereby fixing the position of the connecting column 211, and then fixing the connecting plate 208 and the centering frame 206, thereby fixing the initial extension length of the detection rod 203, making it easier for the operator to put the device into the pipe.

[0062] After the staff puts the device into the pipe, the clamping part 209 opens, causing the connecting plate 208 to separate from the detection rod 203, so as to avoid interfering with the operation of the detection rod 203. After the radiographic test is completed, the staff takes the device out of the pipe, the first adsorption element stops working, so that the limiting piece 212 separates from the connecting column 211, and the connecting plate 208 can move relative to the centering frame 206.

[0063] In some embodiments, see Figure 1 and Figure 3 The detection assembly also includes a second limiting structure disposed between the detection rod 203 and the slide 205, the second limiting structure being used to fix the detection rod 203 and the slide 205 relative to each other.

[0064] The traveling unit 30 includes a traveling seat 301, a first telescopic member 302, multiple traveling components 303, and a second telescopic member 304. The first telescopic member 302 is fixed between the traveling seat 301 and the base 201, and extends and retracts along a first direction. The first telescopic member 302 can be a telescopic oil cylinder or a hydraulic cylinder. The multiple traveling components 303 are spaced apart on the outer periphery of the traveling seat 301. The traveling components 303 are used to drive the traveling seat 301 to move along the first direction. The traveling components 303 are conventional technologies that can travel on the inner wall of a pipe, and will not be described in detail in this application. The second telescopic member 304 is fixed between the traveling components 303 and the traveling seat 301, and extends and retracts radially along the turntable 202. The second telescopic member 304 can be a telescopic oil cylinder or a hydraulic cylinder.

[0065] The second limiting structure includes a storage tank 213 and a transfer component 214. The storage tank 213 is connected to the slide cavity 2051. The storage tank 213 contains an incompressible fluid, such as hydraulic oil or compressed air. The transfer component 214 is located between the storage tank 213 and the slide cavity 2051 and is used to transfer the fluid in the storage tank 213 to the slide cavity 2051 or to return the fluid in the slide cavity 2051 to the storage tank 213. The transfer component 214 can be a bidirectional gear pump or an electromagnetic reversing valve assembly.

[0066] When the inner wall of the pipe encounters a depression, a protrusion, or crosses the weld area, the transfer member 214 transfers the fluid in the storage tank 213 to the sliding cavity 2051, thereby causing the detection rod 203 to press against the inner wall of the pipe. Then, the clamping part 209 is activated to clamp the detection rod 203, thereby preventing the detection rod 203 from retracting.

[0067] After the detection rod 203 presses against the inner wall of the pipe, the second telescopic member 304 is activated to disengage the walking assembly 303 from the inner wall of the pipe. Then, the first telescopic member 302 is activated and retracts, causing the walking unit 30 to move along the first direction, thereby shortening the distance between the walking unit 30 and the correction unit 20. Then, the second telescopic member 304 extends, causing the walking assembly 303 to press against the inner wall of the pipe. When the walking assembly 303 is pressing against the inner wall of the pipe, the extension amount of the second telescopic member 304 is L1. When the walking assembly 303 is pressing against the inner wall of the pipe, the extension amount of the second telescopic member 304 is L2, and L2 is greater than L1. After the walking assembly 303 presses against the inner wall of the pipe, the clamping part 209 is in an open state. At the same time, the transfer member 214 transfers the fluid in the sliding cavity 2051 back to the storage tank 213, thereby releasing the freedom of the detection rod 203 in the radial direction of the turntable 202. Then, the first telescopic member 302 is activated and extends, causing the correction unit 20 to move along the first direction, thereby increasing the distance between the walking unit 30 and the correction unit 20. Obstacle avoidance can be achieved by following the above steps. When it is necessary to move from one weld area to the next weld area, the above steps need to be repeated multiple times.

[0068] In some embodiments, the walking unit 30 further includes a vision sensor.

[0069] Visual sensors can be used to observe depressions, protrusions, or weld seams on the inner wall of pipes, making it easier for staff to operate the device.

[0070] In some embodiments, see Figure 1 The detection assembly also includes a centering seat 215 slidably connected to the centering frame 206, and the aforementioned centering component 207 is used to drive the centering seat 215 to move.

[0071] The execution component includes a movable base 216 and an actuator 217; the movable base 216 is slidably connected to the centering base 215, and the movable base 216 is also connected to the source base 101; the actuator 217 is drivenly connected to the movable base 216 and is used to drive the movable base 216 to move along the length direction of the detection rod 203. The actuator 217 can be a linear module.

[0072] The position of the source seat 101 is moved by the centering component 207 and the centering seat 215, ensuring that the position of the source seat 101 at the endpoints of the two detection rods 203 is always equal. Then, the position of the source seat 101 is moved again by the position of the actuator 217 and the moving seat 216. If the detection rod 203 comes into contact with defects such as dents or deformations in the inner wall of the pipe, the centering component 207 cannot make the source seat 101 coincide with the true center. In this case, the actuator 217 needs to be used to move the position of the source seat 101 again, so that the position of the source seat 101 coincides with the true center.

[0073] In some embodiments, see Figure 1 and Figure 4 The movable base 216 has a receiving cavity 2161 inside, and the inner wall of the receiving cavity 2161 is provided with a barrier material for blocking the transmission of radiation, such as a lead-antimony alloy. The actuation assembly also includes a third telescopic member 218, a sealing plate 219, and an opening and closing member. The central axis of the third telescopic member 218 coincides with the center point of the base 201. The third telescopic member 218 extends and retracts along a first direction. The extension end of the third telescopic member 218 is also connected to the source base 101. The third telescopic member 218 can be a telescopic oil cylinder or a hydraulic cylinder. The sealing plate 219 is located at the port of the receiving cavity 2161. The sealing plate 219 is slidably connected to the movable base 216. The moving direction of the sealing plate 219 is perpendicular to the extension and retraction direction of the third telescopic member 218. The opening and closing member is driven and connected to the sealing plate 219 to drive the sealing plate 219 to move. The opening and closing member can be a servo motor. The opening and closing member is driven and connected to the sealing plate 219 through gears and racks. Gear and rack transmission is a conventional technology and will not be described in detail in this application.

[0074] It should be noted that the sealing plate 219 is also a barrier material for blocking the transmission of rays, such as lead-antimony alloy.

[0075] After the source base 101 is moved to the actual center position, the opening and closing mechanism is activated, causing the sealing plate 219 to move, thereby opening the receiving cavity 2161. The third telescopic component 218 is activated, causing the source base 101 to extend, allowing the radiation source to extend. By setting up barrier materials, the radiation source only comes into contact with the outside world during radiographic work, reducing the danger of the operation.

[0076] In some embodiments, see Figure 4The third telescopic member 218 is provided with a second adsorption member. The second adsorption member is used to adsorb and fix the source base 101 to the third telescopic member 218. The second adsorption member can be an electric suction cup or an electromagnetic component. When the second adsorption member is an electromagnetic component, the outer shell material of the source base 101 is a ferromagnetic material.

[0077] The assembly and disassembly of the source base 101 and the third telescopic component 218 are simple, making it easy for staff to replace the radioactive source.

[0078] 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, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A radiographic positioning device for inspecting weld seams in metal pipes used in building construction, characterized in that, include: A radiographic unit includes a source base and a radiation source disposed within the source base; The correction unit includes a base, a turntable rotatably connected to the base, a rotating component connected to the turntable, a detection component disposed on the turntable, and an execution component. The rotating component drives the turntable to rotate about a first direction as the rotation axis. The detection component includes a detection rod slidably disposed on the turntable and a spring component disposed between the detection rod and the turntable. One end of the detection rod abuts against the inner wall of the pipe, and the spring component causes the detection rod to move away from the center of the turntable. The execution component is connected between the source base and the turntable, and the execution component is used to move the source base. as well as A walking unit, connected to the base, is used to move the base along the first direction.

2. The radiographic positioning device for inspecting weld seams of metal pipes in building construction as described in claim 1, characterized in that, The detection component also includes: A slide block is fixed to the turntable, and the slide block has two opposing sliding cavities, which are located at both ends of the slide block along the radial direction of the turntable. Two measuring structures are respectively disposed in the two sliding cavities. Each measuring structure includes a measuring rod and an elastic element. The measuring rod is slidably connected to the slide block, and the elastic element is fixed between the measuring rod and the slide block. A displacement sensor is installed on the detection rod to monitor the change in the position of the detection rod; A centering frame is provided along the length of the slide block, and the center position of the centering frame is fixedly connected to the center position of the slide block. The centering frame is also connected to the actuating component; and The centering component is connected to the centering frame via a transmission mechanism and is used to adjust the position of the centering frame along the length direction of the detection rod.

3. The radiographic positioning device for inspecting weld seams of metal pipes in building construction as described in claim 2, characterized in that, The detection component also includes: Two connecting plates, one end of which is connected to the two detection rods respectively, and the other end of which is connected to both ends of the centering frame respectively, and the two connecting plates are equidistant from the midpoint of the centering frame; Two clamping parts are provided one-to-one at the end of the connecting plate near the detection rod, and the clamping parts are used to fix the detection rod to the connecting plate; Two deformation members, corresponding one-to-one with the connecting plate, are fixedly connected between the centering frame and the connecting plate. Each deformation member has a preload force that causes the connecting plate to move away from the center position of the centering frame. A first limiting structure is provided between the centering frame and the connecting plate to fix the centering frame and the connecting plate relative to each other.

4. The radiographic positioning device for inspecting weld seams of metal pipes in building construction as described in claim 3, characterized in that, The first limiting structure includes: Two connecting columns, one of which is rotatably connected to the centering frame, and the other of which is rotatably connected to the connecting plate. The two connecting columns are rotatably connected to each other, and the rotation axis of the connecting column is perpendicular to the plate surface of the centering frame. A limiting piece, one end of which is slidably connected to one of the connecting posts, and the other end of which is slidably connected to the other connecting post, wherein the end of the limiting piece moves along the length direction of the connecting post; and Two first adsorption elements are respectively disposed at both ends of the limiting piece, and the first adsorption elements are used to adsorb and fix the limiting piece to the corresponding connecting post.

5. The radiographic positioning device for inspecting weld seams of metal pipes in building construction as described in claim 3, characterized in that, The detection assembly further includes a second limiting structure disposed between the detection rod and the slide block, the second limiting structure being used to fix the detection rod and the slide block relative to each other; The walking unit includes: Walking seat; A first telescopic member is fixedly connected between the walking seat and the base, and the first telescopic member extends and retracts along the first direction; Multiple walking components are spaced apart on the outer periphery of the walking base, the walking components being used to drive the walking base to move along the first direction; and The second telescopic member is fixed between the walking assembly and the walking seat, and the second telescopic member extends and retracts radially along the turntable.

6. The radiographic positioning device for inspecting weld seams of metal pipes in building construction as described in claim 5, characterized in that, The second limiting structure includes: Storage tank, connected to the sliding cavity; and A transfer component is disposed between the storage tank and the sliding cavity, for transferring fluid in the storage tank to the sliding cavity or returning fluid in the sliding cavity to the storage tank.

7. The radiographic positioning device for inspecting weld seams of metal pipes in building construction as described in claim 5, characterized in that, The walking unit also includes a vision sensor.

8. The radiographic positioning device for inspecting weld seams of metal pipes in building construction as described in claim 2, characterized in that, The detection assembly further includes a centering seat slidably connected to the centering frame, and the centering component is used to drive the centering seat to move; The execution component includes: A movable seat, slidably connected to the centering seat, and the movable seat is also connected to the source seat; and An actuator, which is connected to the movable base, is used to drive the movable base to move along the length direction of the detection rod.

9. The radiographic positioning device for inspecting weld seams of metal pipes in building construction as described in claim 8, characterized in that, The movable seat has a storage cavity, and the inner wall of the storage cavity is provided with a barrier material for blocking the transmission of rays. The execution component also includes: The third telescopic component has its central axis coincide with the center point of the base. The third telescopic component extends and retracts along the first direction. The third telescopic component is communicatively connected to the vision sensor. The telescopic end of the third telescopic component is also connected to the source base. A sealing plate is disposed at the port of the receiving cavity, the sealing plate being slidably connected to the movable seat, and the moving direction of the sealing plate being perpendicular to the telescopic direction of the third telescopic member; and An opening and closing element is connected to the sealing plate and is used to drive the sealing plate to move.

10. The radiographic positioning device for inspecting weld seams of metal pipes in building construction as described in claim 9, characterized in that, The third telescopic member is provided with a second adsorption member, which is used to adsorb and fix the source seat to the third telescopic member.

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