Oil and gas pipeline weld reinforcement undercut measuring device

Abstract

The utility model relates to the technical field of pipeline circumferential weld appearance detection, in particular to an oil and gas pipeline weld reinforcement undercut measuring device. The oil and gas pipeline weld reinforcement undercut measuring device comprises two annular rails, a detection machine head and a data acquisition terminal, the two rails are coaxially arranged on two welded pipelines in a sleeved mode respectively, walking mechanisms moving in the circumferential direction of the rails are arranged on the rails respectively, the detection machine head is arranged between the two rails, and the data acquisition terminal is connected with the detection machine head. The two walking mechanisms are arranged on the two sides of the detection machine head, fall at a welding seam and are used for detecting surplus height and undercut information of the circumferential welding seam, the two walking mechanisms are connected with the two ends of the detection machine head through connecting pieces respectively, and the detection machine head is in signal connection with the data acquisition terminal. The device has the advantages that the structural design is simple and reasonable, 360-degree excess weld metal and undercut information of the circumferential weld can be rapidly detected, the device is installed in a detachable connection mode, the installation precision is high, the detection result is accurate, and the measurement efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of appearance detection of pipeline girth welds, and particularly relates to a measuring device for the reinforcement and undercut of oil and gas pipeline welds. Background Technique

[0002] The girth welds of long-distance oil and gas pipelines have always been the weakest parts of the pipelines, and the quality of the girth welds directly affects the safe and stable operation of the pipelines. Due to reasons such as the imperfect implementation of pipeline welding processes, the influence of external environments, and the unstable output parameters of welding machines and equipment, weld quality problems have not been completely eliminated, and the cracking of girth welds is one of the main failure forms of oil and gas pipelines. In recent years, the proportion of pipeline safety problems caused by weld quality problems has exceeded 80%.

[0003] Because the newly built high-grade steel pipelines bear high internal pressure and the weld toughness is insufficient, girth weld cracking accidents occur from time to time, often causing serious property losses, casualties and environmental damage. Timely and accurate detection of the welds is of great economic and social significance for ensuring the inherent safety of the pipelines. In recent years, the focus of attention of pipeline industry scientific and technical workers has mainly been concentrated on analyzing the characteristics and causes of weld failures, and exploring the main technologies and their characteristics that can be used for internal and external detection of oil and gas pipeline weld defects. The general factors for weld failures are summarized as: welding defects, uneven microstructure, welding residual stress, secondary stress and additional loads. Existing conventional detection methods include a variety of non-destructive testing technologies such as magnetic flux leakage testing, eddy current testing, ultrasonic testing, ray testing, magnetic particle testing and penetrant testing. After years of research, the detection capabilities of related technologies for weld defects have been further improved.

[0004] At present, the quality detection of long-distance oil and gas pipeline girth welds mainly involves two aspects: internal quality detection and appearance quality detection. Among them, the appearance quality detection of welds mostly still relies on the visual observation method of inspectors. From the actual implementation, it can be seen that this manual method has high skill requirements for inspectors, high labor intensity, and the detection results are prone to large deviations due to personnel experience factors, and it is difficult to meet the future automation and intelligent detection requirements of the oil and gas pipeline industry. In addition, the welding operation time of long-distance oil and gas pipelines is relatively long. The visual observation method makes the labor intensity of inspectors very high, and the timeliness and accuracy of detection cannot be guaranteed.

[0005] In recent years, researchers at home and abroad have gradually applied visual sensing technology to the acquisition of weld appearance morphology and carried out a lot of research. However, their research mainly focuses on how to determine the subsequent welding starting point and welding path through the appearance contour of the previous weld, and does not involve the research on data acquisition, identification and determination of weld appearance defects.

[0006] Based on this, it is necessary to develop a measuring device for the reinforcement and undercut of oil and gas pipeline welds to overcome the above technical problems. Summary of the Invention

[0007] The technical problem to be solved by the utility model is to provide a measuring device for the reinforcement and undercut of oil and gas pipeline welds, which effectively overcomes the defects of the prior art.

[0008] The technical solution of the utility model for solving the above technical problem is as follows:

[0009] A measuring device for the reinforcement and undercut of oil and gas pipeline welds includes two circular tracks, a detection head and a data acquisition terminal. The two tracks are coaxially sleeved on two sections of welded pipelines respectively. The tracks are respectively provided with traveling mechanisms that move along their circumferences. The detection head is arranged between the two tracks and falls on the weld for detecting the reinforcement and undercut information of the circumferential weld. The two traveling mechanisms are respectively connected to both ends of the detection head through connecting pieces, and the detection head is signal-connected to the data acquisition terminal.

[0010] On the basis of the above technical solution, the utility model can be further improved as follows.

[0011] Further, the traveling mechanism includes a housing, upper rollers, lower rollers, a motor and a gear. At one side of both ends of the housing close to the track, brackets are respectively provided. There are two groups of upper rollers and lower rollers, which are respectively rotatably installed at one side of the two brackets close to each other at upper and lower intervals. The upper rollers roll and support on the outer surface of the track, and the lower rollers roll and support on the inner surface of the track. A circular rack is coaxially arranged on the outer surface of the track. The motor is installed in the housing and connected to a power supply installed in the housing. There is an opening in the middle of one side of the housing close to the track. The gear passes through the opening and meshes with the rack, and the shaft of the motor is coaxially connected to the gear.

[0012] The track includes two arc-shaped sub-tracks. A plurality of adsorbing components are arranged on the inner sides of the two sub-tracks. The sub-tracks are adsorbed on the surface of the pipeline through the adsorbing components. The rack includes two arc-shaped rack segments, which are respectively coaxially fixed on the outer surfaces of the two sub-tracks.

[0013] Further, the adsorbing component is a magnet block.

[0014] Further, a plurality of the adsorbing components are provided and are arranged at intervals along the circumference on the inner sides of the corresponding sub-tracks.

[0015] Further, the above-mentioned connecting piece includes a universal connecting rod and a connecting bolt. One end of the universal connecting rod is connected to one end of the corresponding traveling mechanism, and the other end of the universal connecting rod is connected to the nut of the connecting bolt. Screw holes adapted to the connecting bolts are respectively provided at both ends of the inspection head. The connecting bolts of the two connecting pieces respectively extend into the screw holes at both ends of the inspection head and are screwed together with each other.

[0016] Further, the above-mentioned data acquisition terminal is a handheld wireless data acquisition terminal.

[0017] Further, the inspection head includes a U-shaped main body, two arc-shaped supporting feet and inspection probes. The two supporting feet are spaced along the axial direction of the pipeline and are respectively coaxially arranged on the surface of the pipeline. The two end parts of the main body are respectively connected and fixed to the outer surfaces of the two supporting feet. The inspection probe is installed in the middle hollow area of the main body, and the inspection probe extends to the end close to the pipeline surface. A main control chip connected to the inspection probe is provided in the main body, and the main control chip is connected to the data acquisition terminal through a wireless communication module.

[0018] Further, the above-mentioned inspection probes are respectively defined as five categories, and the five categories of inspection probes are respectively a left base metal probe, a left weld toe probe, a weld seam probe, a right weld toe probe and a right base metal probe, and are spaced from one end of the main body to the other end.

[0019] Further, the above-mentioned wireless communication module is a Bluetooth module.

[0020] The beneficial effects of the present utility model are: the structure design is simple and reasonable, it can quickly detect the 360° reinforcement and undercut information of the girth weld, and it is installed by a detachable connection method, with high installation accuracy, accurate detection results and improved measurement efficiency. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the device for measuring the reinforcement and undercut of the weld of the oil and gas pipeline of the present utility model;

[0022] Figure 2 It is a schematic structural diagram of the inspection head in the device for measuring the reinforcement and undercut of the weld of the oil and gas pipeline of the present utility model;

[0023] Figure 3 It is a schematic structural diagram of the inspection head in another perspective in the device for measuring the reinforcement and undercut of the weld of the oil and gas pipeline of the present utility model;

[0024] Figure 4 It is a schematic structural diagram of the device for measuring the reinforcement and undercut of the weld of the oil and gas pipeline of the present utility model after removing the inspection head;

[0025] Figure 5This is a structural cross - section view of the cooperation between the traveling mechanism and the track in the device for measuring the reinforcement and undercut of the weld seam of the oil - gas pipeline of the present utility model.

[0026] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0027] 1. Track; 2. Detection head; 3. Data acquisition terminal; 4. Traveling mechanism; 5. Connecting piece; 11. Adsorption component; 12. Rack; 21. Main body; 22. Support foot pad; 23. Detection probe; 41. Shell; 42. Upper roller; 43. Lower roller; 44. Motor; 45. Gear; 51. Universal connecting rod; 52. Connecting bolt; 411. Bracket. Specific implementation manner

[0028] The principles and features of the present utility model will be described below with reference to the attached drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0029] Embodiment: As Figures 1 to 5 shown, the device for measuring the reinforcement and undercut of the weld seam of the oil - gas pipeline in this embodiment includes two circular - ring - shaped tracks 1, a detection head 2, and a data acquisition terminal 3. The two above - mentioned tracks 1 are coaxially sleeved on two sections of welded pipelines respectively. The above - mentioned tracks 1 are respectively provided with traveling mechanisms 4 that move along their circumferences. The above - mentioned detection head 2 is arranged between the two above - mentioned tracks 1 and falls on the weld seam, and is used to detect the reinforcement and undercut information of the circumferential weld seam. The two above - mentioned traveling mechanisms 4 are respectively connected to both ends of the above - mentioned detection head 2 through connecting pieces 5. The above - mentioned detection head 2 is in signal connection with the above - mentioned data acquisition terminal 3.

[0030] When the device for measuring the reinforcement and undercut of the weld seam of the oil - gas pipeline in this embodiment is in use, except for the data acquisition terminal 3, other components are installed on the target pipeline to be detected. During detection, the traveling mechanisms 4 installed on the two tracks 1 move synchronously along the circumference, thereby driving the detection head 2 to rotate around the circumferential direction, so as to realize the detection of the weld seam. The detected data is fed back to the data acquisition terminal 3. The whole device can quickly detect the 360° reinforcement and undercut information of the circumferential weld seam, and is installed by a detachable connection method, with high installation accuracy, accurate detection results, and improved measurement efficiency. The data acquisition and processing system has the advantages of an integrated knowledge base and data processing functions, can realize the identification and determination of the appearance parameters of the weld seam, and the modular design concept can help on - site detection personnel reduce the installation and test workload. Overall, the structural design is simple and reasonable, and is installed by a detachable connection method, with high installation accuracy, accurate detection results, and improved measurement efficiency.

[0031] As a preferred embodiment, the above-mentioned traveling mechanism 4 includes a housing 41, upper rollers 42, lower rollers 43, a motor 44, and gears 45. At both ends of the housing 41, brackets 411 are respectively provided on one side close to the track 1. There are two sets of the upper rollers 42 and the lower rollers 43, which are respectively rotatably installed on one side of the two brackets 411 relatively close to each other at upper and lower intervals. The upper rollers 42 are rollingly supported on the outer surface of the track 1, and the lower rollers 43 are rollingly supported on the inner surface of the track 1. A circular rack 12 is coaxially provided on the outer surface of the track 1. The motor 44 is installed in the housing 41 and is connected to a power source installed in the housing 41. An opening is provided in the middle of one side of the housing 41 close to the track 1. The gear 45 passes through the opening and meshes with the rack 12. The shaft of the motor 44 is coaxially connected to the gear 45.

[0032] In the above-mentioned implementation scheme, both ends of the housing 41 are respectively rollingly supported on the inner and outer edges of the track 1 by at least one set of upper rollers 42 and lower rollers 43. The motor 44 drives the gear 45 to rotate, so that the gear 45 walks circumferentially around the arc-shaped rack 12 meshed with it. This structural design is reasonable and the operation is relatively stable.

[0033] In this embodiment, the above-mentioned track 1 includes two arc-shaped sub-tracks. A plurality of adsorbing members 11 are provided on the inner sides of the two sub-tracks. The sub-tracks are adsorbed on the surface of the pipeline through the adsorbing members 11. The rack 12 includes two arc-shaped rack segments, and the two rack segments are respectively coaxially fixed on the outer surfaces of the two sub-tracks. The track 1 is assembled by two sub-tracks to form a complete circle, which is convenient for installation on the pipeline. Each sub-track can be easily and stably adsorbed on the surface of the pipeline through the adsorbing member 11, and the operation is very convenient and fast. In this embodiment, the size of the track 1 can be adapted in length according to the outer diameter of the target pipeline to be detected.

[0034] In this embodiment, the above-mentioned adsorbing member 11 is a magnet block, and specifically, an arc-shaped magnet block can be used.

[0035] In this embodiment, a plurality of the adsorbing members 11 are provided and are arranged at intervals in the circumferential direction on the inner sides of the corresponding sub-tracks. Ensure that the sub-track can be stably and firmly adsorbed on the surface of the pipeline.

[0036] As a preferred embodiment, the above-mentioned connecting member 5 includes a universal connecting rod 51 and a connecting bolt 52. One end of the universal connecting rod 51 is connected to one end of the corresponding traveling mechanism 4, and the other end of the universal connecting rod 51 is connected to the nut of the connecting bolt 52. Thread holes (designated as M in the figure) adapted to the connecting bolts 52 are respectively provided at both ends of the inspection head 2. The connecting bolts 52 of the two connecting members 5 respectively extend into the thread holes at both ends of the inspection head 2 in a one-to-one correspondence and are screwed together.

[0037] In the above-mentioned implementation, the universal connecting rod 51 can adjust its direction by 360°. By threading the connecting bolt 52 into the thread holes at both ends of the inspection head 2, the inspection head 2 can be stably connected between the two traveling mechanisms 4. Cooperating with the synchronous movement of the two traveling mechanisms 4, the inspection head 2 can be driven to stably move circumferentially along the pipeline for inspection. The design is relatively reasonable and is easy to assemble, connect and disassemble.

[0038] In this embodiment, the above-mentioned data acquisition terminal 3 is a handheld wireless data acquisition terminal. Among them, the handheld wireless data acquisition terminal is a product of the prior art. During actual use, an appropriate model can be selected according to needs, and no further description will be given here.

[0039] As a preferred embodiment, the above-mentioned inspection head 2 includes a U-shaped main body 21, two arc-shaped supporting feet 22 and inspection probes 23. The two supporting feet 22 are distributed at intervals along the axial direction of the pipeline and are respectively coaxially arranged on the surface of the pipeline. The two end parts of the main body 21 are respectively connected and fixed to the outer surfaces of the two supporting feet 22. The inspection probes 23 are installed in the middle hollow area of the main body 21, and the inspection probes 23 extend to the end close to the pipeline surface. A main control chip connected to the inspection probes 23 is provided in the main body 21, and the main control chip is connected to the data acquisition terminal 3 through a wireless communication module.

[0040] In the above embodiments, the support pads 22 of the detection head 2 include two sets arranged at intervals. Each set of support pads 22 is composed of two sector flat steels with the same arc, where the smaller flat steel is laminated on the outer surface of the larger flat steel to jointly form the support pad 22. Threaded holes are drilled in the smaller flat steel, and the larger flat steel is not drilled and is welded to the smaller sector flat steel. The support pads 22 are replaced according to the arc of the detected target pipe wall. The height of the detection head 2 is adjusted between the support pads 22 and the detection head 2 through gaskets (designated as L in the figure) and adjusting bolts (designated as S in the figure). Specifically, gaskets are clamped between the lower parts at both ends of the main body 21 and the outer surface of the smaller flat steel. Connecting parts extend from both ends of the main body 21 to both sides, and bolts are penetrated through the connecting parts. The bolts are threadedly connected to the threaded holes at both ends of the outer surface of the smaller flat steel. By adjusting the screwing depth of the two bolts, the purpose of adjusting the height of the detection head 2 is achieved. The adjustability and consistency of the detection reference are ensured through adjustment. The arc of the support pad 22 is the same as the arc of the pipe wall of the target pipe, and it can always maintain a state of being closely attached to the pipe wall during measurement, serving as the zero-position reference starting line for measuring the weld reinforcement and undercut depth.

[0041] As a preferred embodiment, the above detection probes 23 are respectively defined into five categories, and the five types of the above detection probes 23 are respectively a left base metal probe, a left weld toe probe, a weld probe, a right weld toe probe, and a right base metal probe, and are spaced apart from one end to the other end of the above main body 21.

[0042] In the above embodiments, the area where the left base metal probe is located forms a left base metal probe measurement area a, and the area where the right base metal probe is located forms a right base metal probe measurement area b (respectively located at positions close to both ends of the main body 1). The probes in areas a and b have the same outer diameter size in the range of 2 - 5 mm, and the number of probes (transverse × radial) is not less than 5 × 10. The measurement accuracy of the probes for various data such as the surface profile and pit depth of the base metal is not less than 0.01 mm.

[0043] The probe data collected by the left parent metal probe measurement area a and the right parent metal probe measurement area b are fed back to the data acquisition terminal 3, and the average value is calculated by the data acquisition terminal 3. The measurement average value of the two types of parent metal probe measurement areas is used as the zero point correction of the displacement sensor, and the measurement values of the left weld toe probe measurement area c formed by the left weld toe probe, the weld probe measurement area d formed by the weld probe, and the right weld toe probe measurement area e formed by the right weld toe probe are algebraically calculated, and the final result is used as the absolute value of the undercut and the absolute value of the weld excess height. Among them, the probes of the left weld toe probe measurement area c and the right weld toe probe measurement area e (distributed at positions close to the left parent metal probe and the right parent metal probe respectively) are all of the same outer diameter size in the range of 1-2mm, and the number of probes on each side (lateral × radial) is not less than 10×20. The measurement accuracy of the probe for various data such as the weld toe surface profile, undercut depth, pit depth, crack depth, etc. is not less than 0.01mm. The probes of the weld probe measurement area d formed by the weld probe (located between the left weld toe probe measurement area c and the right weld toe probe measurement area e) have the same outer diameter size in the range of 2-3mm, and the number of probes (transverse × radial) is not less than 10 × 10. The measurement accuracy of the probe for various data such as weld surface profile, weld groove depth, pit depth, crack depth, and residual height value is not less than 0.01mm.

[0044] In this embodiment, the wireless communication module is a Bluetooth module, which is an existing wireless communication module and will not be described in detail here.

[0045] In this embodiment, the data acquisition terminal 3 is connected to the wireless communication module integrated on the host chip of the detection head 2 through the Bluetooth short-range wireless communication technology, and has both data acquisition and data processing functions. The reserved data interface can output the collected data to a portable mobile storage flash disk. Generally, the data acquisition terminal 3 includes a single-chip microcomputer for internal data acquisition, processing, and transmission. The handle is connected to the internal electrical components of the detection head 2 through the Bluetooth short-range wireless communication technology. The displacement value of each brush is recorded by the displacement sensor set on the host chip inside the detection head 2, and data processing is performed according to the value to obtain the average height of the parent material area, the average depth and maximum depth of the weld toe area, and the maximum excess height and average excess height of the weld area. The data acquisition terminal 3 calculates the corresponding measurement parameters according to the selected measurement conditions and outputs them to its own LCD display to guide the on-site measurement work in real time. The whole measurement process can clearly display all measurement parameters on the LCD display by processing and analyzing the signal, determine the overall condition of the pipeline weld appearance detection such as weld excess height and undercut depth, and automatically determine the compliance of the measurement data. The relevant measured values are compared with the default ranges in the knowledge base of national standards, industry standards, enterprise standards, etc. stored in the data acquisition handle microcontroller. Numbers outside the normal range will be alarmed through the alarm integrated in the data acquisition terminal 3.

[0046] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0047] In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0048] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0049] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0050] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0051] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. An overheight and undercut measuring device for the weld of an oil and gas pipeline, characterized in that: It includes two annular tracks (1), a detection head (2) and a data acquisition terminal (3). The two tracks (1) are coaxially sleeved on two welded pipes respectively. The tracks (1) are respectively provided with traveling mechanisms (4) that move along their circumferences. The detection head (2) is arranged between the two tracks (1) and is located at the weld seam for detecting the reinforcement height and undercut information of the circumferential weld. The two traveling mechanisms (4) are respectively connected to both ends of the detection head (2) through connectors (5). The detection head (2) is signal-connected to the data acquisition terminal (3).

2. The butt weld reinforcement and undercut measuring device for oil and gas pipelines according to claim 1, characterized in that: The traveling mechanism (4) includes a housing (41), upper rollers (42), lower rollers (43), a motor (44) and a gear (45). At both ends of the housing (41) near one side of the track (1), brackets (411) are respectively provided. There are two sets of upper rollers (42) and lower rollers (43), which are respectively rotatably installed at the relatively close sides of the two brackets (411) at upper and lower intervals. The upper rollers (42) roll and support on the outer surface of the track (1), and the lower rollers (43) roll and support on the inner surface of the track (1). A circular rack (12) is coaxially arranged on the outer surface of the track (1). The motor (44) is installed in the housing (41) and is connected to the power supply installed in the housing (41). There is an opening in the middle of one side of the housing (41) near the track (1). The gear (45) passes through this opening and meshes with the rack (12). The shaft of the motor (44) is coaxially connected to the gear (45).

3. The measuring device for the reinforcement and undercut of the weld seam of an oil and gas pipeline according to claim 2, characterized in that: The track (1) includes two arc-shaped sub-tracks. A plurality of adsorbing members (11) are provided on the inner sides of the two sub-tracks. The sub-tracks are adsorbed on the pipe surface through the adsorbing members (11). The rack (12) includes two arc-shaped rack segments, and the two rack segments are respectively coaxially fixed on the outer surfaces of the two sub-tracks.

4. The welding seam reinforcement and undercut measuring device for oil and gas pipelines according to claim 3, characterized in that: The adsorbing member (11) is a magnet block.

5. The bevel height and undercut measuring device for the weld seam of an oil and gas pipeline according to claim 4, wherein: A plurality of the adsorbing members (11) are provided and are arranged at intervals along the circumference on the inner sides of the corresponding sub-tracks.

6. The bevel height and undercut measuring device for the weld seam of an oil and gas pipeline according to claim 1, wherein: The connector (5) includes a universal connecting rod (51) and a connecting bolt (52). One end of the universal connecting rod (51) is connected to one end of the corresponding traveling mechanism (4), and the other end of the universal connecting rod (51) is connected to the nut of the connecting bolt (52). Threaded holes adapted to the connecting bolts (52) are respectively provided at both ends of the detection head (2). The connecting bolts (52) of the two connectors (5) respectively extend into the threaded holes at both ends of the detection head (2) in a one-to-one correspondence and are screwed together.

7. The measuring device for the reinforcement and undercut of the weld seam of an oil and gas pipeline according to claim 1, wherein: The data acquisition terminal (3) is a handheld wireless data acquisition terminal.

8. A measuring device for the reinforcement and undercut of the weld seam of an oil and gas pipeline according to any one of claims 1 to 7, characterized in that: The detection head (2) includes a U-shaped main body (21), two arc-shaped support feet (22) and detection probes (23). The two support feet (22) are spaced apart along the axial direction of the pipeline and are respectively coaxially arranged on the surface of the pipeline. The two end portions of the main body (21) are respectively connected and fixed to the outer surfaces of the two support feet (22). The detection probes (23) are installed in the middle hollow area of the main body (21), and the detection probes (23) extend to the end close to the pipeline surface. A host chip connected to the detection probes (23) is arranged in the main body (21), and the host chip is connected to the data acquisition terminal (3) through a wireless communication module.

9. The measuring device for the reinforcement and undercut of the welded joint of an oil and gas pipeline according to claim 8, wherein: The detection probes (23) are respectively defined into five categories, and the five categories of detection probes (23) are respectively a left base metal probe, a left weld toe probe, a weld seam probe, a right weld toe probe and a right base metal probe, and are spaced apart from one end of the main body (21) to the other end.

10. The measuring device for the weld reinforcement and undercut of an oil and gas pipeline according to claim 8, wherein: The wireless communication module is a Bluetooth module.

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