Ultrasonic defect positioning device for circumferential weld of pipeline

Abstract

The invention relates to the technical field of pipeline circumferential weld defect positioning, and discloses a pipeline circumferential weld ultrasonic defect positioning device which comprises a plurality of steel pipe bodies supported by two U-shaped supporting frames and a detection mechanism used for detecting and positioning circumferential welds on the steel pipe bodies. The detection mechanism comprises a base capable of moving automatically. According to the ultrasonic defect positioning device for the circumferential weld of the pipeline, the steel pipe body rolls on the tops of the two U-shaped supporting frames and is matched with the arrangement of the ultrasonic detection module, so that the circumferential weld position of the steel pipe body can be subjected to all-directional ultrasonic defect positioning work, and the defect position is subjected to ink jet marking through the ink jet module; according to the technical scheme, the steel pipe body in the supporting and storing process can be directly detected, the steel pipe body does not need to be repeatedly transferred, the defect positioning and detecting convenience is improved, and the circumferential weld defect of the steel pipe body can be comprehensively positioned and detected.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline girth weld defect positioning, and specifically to an ultrasonic defect positioning device for pipeline girth welds. Background Art

[0002] When pipelines are assembled and spliced, generally welding equipment is required to weld at least two pipelines together so that multiple pipelines form an integral body. To ensure the quality of the assembled pipelines, corresponding defect positioning and detection equipment is generally required to detect the girth weld positions of the welds. A Chinese utility model patent with the publication number CN218412377U discloses an ultrasonic defect positioning device for pipeline girth welds. The second motor drives the rod to rotate, and through the third gear and the fourth gear, the wheels on the second connecting rod are driven to rotate, thus avoiding manual work and increasing the detection stability. Then, the first motor drives the coupling connecting the first connecting rod to rotate. Through the first gear and the second gear on the first connecting rod, the inclined plate on the second gear and the ultrasonic detection probe perform circular motion, thereby effectively increasing the detection range and improving the accuracy of detection and positioning.

[0003] In related technologies, most traditional ultrasonic defect positioning methods are to detect with a handheld ultrasonic instrument, which has a relatively high working intensity. To reduce the working intensity and improve the defect positioning and detection effect, when the existing ultrasonic defect positioning device performs defect positioning on pipeline girth welds, by installing or sleeving the defect positioning device on the outer surface of the pipeline and making the ultrasonic detection end move circularly along the position of the girth weld, a full-range ultrasonic defect positioning work can be formed. Although this method can effectively perform defect positioning work on pipeline girth welds, when detecting multiple pipelines, the steel pipes need to be lifted and driven repeatedly. Due to the large weight of the steel pipes, they cannot be carried manually and a crane needs to be used for operation, resulting in a relatively high working cost. Moreover, the detection environment is limited to a certain extent, and it is impossible to directly perform defect positioning work on the pipelines during the support process. And this kind of ultrasonic defect positioning work usually can only perform girth weld defect positioning work on pipelines of a single pipe diameter size. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides an ultrasonic defect positioning device for pipeline girth welds. By driving one of the positioning members horizontally through a driving assembly, the steel pipe body can be pushed, so that the steel pipe body rolls on the tops of two U-shaped support frames. With the arrangement of the ultrasonic detection module, the ultrasonic defect positioning work can be carried out in all directions on the girth weld position of the steel pipe body, and the defect position is marked by inkjet through the inkjet module. It can not only directly detect the steel pipe body during the support and storage process without repeatedly transferring the steel pipe body, but also meet the defect positioning work of steel pipe bodies with different pipe diameters, improving the convenience of defect positioning detection. Moreover, it can perform all-round positioning detection on the girth weld defects of the steel pipe body, solving the problems that when the existing equipment locates the defects of pipeline girth welds, the equipment needs to be installed on the pipeline to be tested. Therefore, when positioning the defects of multiple pipelines, the steel pipe needs to be repeatedly lifted and driven, with a relatively large working intensity, and the detection environment is subject to certain limitations, and it is impossible to directly perform defect positioning work on the pipeline during the support process.

[0006] (II) Technical Solution

[0007] To achieve the above object, the present invention provides the following technical solution: An ultrasonic defect positioning device for pipeline girth welds, including a plurality of steel pipe bodies supported by two groups of U-shaped support frames and a detection mechanism for detecting and positioning the girth welds on the steel pipe bodies;

[0008] The detection mechanism includes a movable base, the top of the base is provided with a workbench that can be driven up and down, the top of the workbench is slidably connected with a U-shaped frame and a sliding frame respectively, the inner side of the sliding frame is fixedly connected with a mounting frame, and one side of the mounting frame is fixedly connected with an ultrasonic detection module for detecting the steel pipe body rolling on the top of the U-shaped support frame and an inkjet module for positioning the defect position of the girth weld;

[0009] The tops of the U-shaped frame and the sliding frame are both provided with positioning members for positioning the steel pipe body, and the bottom of the workbench is provided with a driving assembly for driving the U-shaped frame left and right.

[0010] Preferably, four telescopic rods are fixedly connected to the top of the base, and the telescopic ends of the four telescopic rods are all fixed to the bottom of the workbench. An X-shaped expansion frame group is arranged between the base and the workbench;

[0011] An electric cylinder for stretching and contracting the X-shaped expansion frame group is installed on the top of the base.

[0012] Preferably, the positioning member comprises a bracket group fixed to the top of the U-shaped frame and the sliding frame, both ends of the bracket group are fixedly connected with arc plates, and the inner sides of the two arc plates are rotatably connected with at least two groups of symmetrical guide rollers.

[0013] Preferably, one side of the top of the workbench is fixedly connected to a spring group via a fixing frame, and one end of the spring group is fixedly connected to the outer side surface of the sliding frame.

[0014] Preferably, the driving assembly comprises a screw rod rotatably connected to the bottom of the workbench through a bracket, a threaded rack is threadedly connected to the outer surface of the screw rod, the top of the threaded rack is fixedly connected to the bottom of the U-shaped rack, and a sliding groove for left-right driving of the threaded rack is provided on the top of the workbench;

[0015] A motor for driving the screw rod to rotate forward and reverse is fixedly connected to one side of the bottom of the workbench.

[0016] Preferably, the bracket group comprises a square tube, two extension frames are inserted inside the square tube, and one end of the two extension frames is fixedly connected to the outer side surfaces of the two arc-shaped plates respectively.

[0017] Preferably, a plurality of locking openings are provided inside the square tube, a T-shaped latch for inserting into the locking opening is slidably connected inside the other ends of the two stretching frames, and an elastic member for elastically squeezing the T-shaped latch is fixedly connected inside the other ends of the two stretching frames.

[0018] Preferably, two toggle members are connected to the top of the positioning member on the U-shaped frame;

[0019] The toggle member includes a U-shaped block, the interior of the U-shaped block is rotatably connected to an insert block via a rotating shaft, a torsion spring is installed at the rotating end of the insert block, and a U-shaped limit block is fixedly connected to one side of the U-shaped block for limiting the vertically upward insert block.

[0020] (III) Beneficial effects

[0021] Compared with the prior art, the present invention provides a pipeline girth weld ultrasonic defect locating device, which has the following beneficial effects:

[0022] 1. The present invention installs positioning parts for positioning the steel pipe body on the top and bottom of the U-frame and the sliding frame. By driving the U-frame transversely through the driving component, one of the positioning parts can be driven to move transversely. By moving the positioning part, the steel pipe body can be pushed so that the steel pipe body rolls on the top of the two U-shaped support frames. With the setting of the ultrasonic detection module, the circumferential weld position of the steel pipe body can be fully ultrasonically located, and the defect position can be marked by inkjet through the inkjet module to facilitate the subsequent accurate positioning of the rework personnel. Not only can the steel pipe body in the support storage process be directly inspected without repeatedly transferring the steel pipe body, but also the defect positioning work of steel pipe bodies of different diameters is satisfied, the convenience of defect positioning detection is improved, and the circumferential weld defects of the steel pipe body can be fully positioned and detected.

[0023] 2. The present invention has a bracket group including a square tube and two extension frames inserted inside the square tube, so that the distance between the two arc plates can be adjusted by telescopic adjustment of the two extension frames, thereby improving the smoothness and balance of the steel tube body driving, and preventing the problem that when the steel tube body is long, the local position of the steel tube body is driven, causing the steel tube body to tilt when rolling on the top of the U-shaped support frame, thereby affecting the subsequent ultrasonic defect positioning work.

[0024] 3. The present invention installs two toggle members on the positioning member on the U-frame, so that when the gap between the two steel pipe bodies to be detected is small, the toggle members can be pre-inserted and the U-frame can be shifted sideways to form a fine adjustment of the position of the steel pipe body, thereby facilitating the insertion of the U-frame and the positioning member above to perform subsequent positioning detection work; the insert block is installed in a rotating manner, and the insert block is vertically limited by the U-shaped limit block, thereby ensuring that the insert block always maintains a vertical state through the elastic force of the torsion spring itself, thereby facilitating the insert block to be better inserted into the gap between the two steel pipe bodies, and in conjunction with the feeding of the detection equipment, the insert block can form an angle fold according to the obstruction of the steel pipe body, thereby further improving the use effect of the toggle of the steel pipe body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the ultrasonic defect locating device for pipeline girth weld of the present invention;

[0026] Figure 2 It is a working schematic diagram of the ultrasonic defect locating device for pipeline girth weld of the present invention;

[0027] Figure 3 For the present invention Figure 1 Schematic diagram of the structure of the testing agency;

[0028] Figure 4 For the present invention Figure 3 The structural diagram of the workbench in the middle;

[0029] Figure 5 For the present invention Figure 4 Bottom view of the structure of the middle workbench;

[0030] Figure 6 For the present invention Figure 4 A schematic diagram of the structure of the middle sliding frame;

[0031] Figure 7 For the present invention Figure 6 A structural side view of the middle sliding frame;

[0032] Figure 8 For the present invention Figure 7 A schematic diagram of the structure of the middle bracket group;

[0033] Figure 9 For the present invention Figure 8 Partial cross-sectional view of the medium square tube;

[0034] Figure 10 For the present invention Figure 4 Schematic diagram of the structure of the middle U-shaped frame;

[0035] Figure 11 For the present invention Figure 10 Schematic diagram of the structure of the middle toggle member.

[0036] In the figure: 100, U-shaped support frame; 200, steel pipe body; 300, detection mechanism;

[0037] 1. Base; 2. Workbench; 3. U-shaped frame; 4. Sliding frame; 5. Mounting frame; 6. Ultrasonic detection module; 7. Inkjet module;

[0038] 8. Positioning member; 81. Arc plate; 82. Guide roller;

[0039] 83. Bracket assembly; 831. Square tube; 832. Extension frame; 833. Locking opening; 834. T-type latch; 835. Elastic member;

[0040] 9. driving assembly; 91. screw rod; 92. threaded rack; 93. motor;

[0041] 10. toggle member; 101. U-shaped block; 102. insert block; 103. torsion spring; 104. U-shaped limit block;

[0042] 11. Telescopic rod; 12. X-shaped unfolding frame assembly; 13. Electric cylinder; 14. Spring assembly. DETAILED DESCRIPTION

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] Embodiment 1:

[0045] Referring to the attached Figures 1 - 11 , a device for ultrasonic defect location of pipeline girth welds includes a plurality of steel pipe bodies 200 supported by two groups of U-shaped support frames 100 and a detection mechanism 300 for detecting and locating the girth welds on the steel pipe bodies 200;

[0046] Through the setting of the two groups of U-shaped support frames 100, it is used to support the steel pipe body 200 undergoing welding treatment. Through the setting of the detection mechanism 300, it is used to perform ultrasonic defect location work on the steel pipe body 200 during the support process;

[0047] The detection mechanism 300 includes a movable base 1. A workbench 2 that can be driven up and down is arranged on the top of the base 1. A U-shaped frame 3 and a sliding frame 4 are respectively slidably connected to the top of the workbench 2. An installation frame 5 is fixedly connected to the inner side of the sliding frame 4. And an ultrasonic detection module 6 for detecting the steel pipe body 200 rolling on the top of the U-shaped support frame 100 and an inkjet module 7 for locating the defect position of the girth weld are fixedly connected to one side of the installation frame 5;

[0048] Through the lateral movement of the U-shaped frame 3, the steel pipe body 200 on the top of the U-shaped support frame 100 can be pushed, so that the steel pipe body 200 rolls to the position of the sliding frame 4, and then the ultrasonic detection module 6 is located directly below the girth weld of the steel pipe body 200. Then, with the lateral movement drive of the U-shaped frame 3, the steel pipe body 200 can be continuously rolled, and the sliding frame 4 can be driven synchronously. Furthermore, the ultrasonic detection module 6 and the inkjet module 7 on the installation frame 5 can be driven to move synchronously, forming a comprehensive ultrasonic defect location work for the girth weld of the steel pipe body 200;

[0049] The ultrasonic detection module 6 uses an ultrasonic detector in the prior art for detecting the position of the steel pipe weld. The inkjet module 7 uses an inkjet instrument with an inkjet marking function in the prior art to spray an ink dot at the defect position for easy search by the rework personnel;

[0050] Positioning members 8 for positioning the steel pipe body 200 are arranged on the tops of the U-shaped frame 3 and the sliding frame 4. A driving component 9 for driving the U-shaped frame 3 left and right is arranged at the bottom of the workbench 2;

[0051] By installing positioning members 8 for positioning the steel pipe body 200 on both the top and bottom of the U-shaped frame 3 and the sliding frame 4, and driving the U-shaped frame 3 to move horizontally through the driving assembly 9, one of the positioning members 8 can be driven to move horizontally. Through the movement of this positioning member 8, the steel pipe body 200 can be pushed, so that the steel pipe body 200 rolls on the top of the two U-shaped support frames 100. With the setting of the ultrasonic detection module 6, the ultrasonic defect positioning work of the circumferential weld position of the steel pipe body 200 can be carried out in all directions, and the defect position is inkjet marked through the inkjet module 7 for the accurate positioning of the subsequent rework personnel. It can not only directly detect the steel pipe body 200 during the support storage process without repeatedly transferring the steel pipe body 200, improving the convenience of defect positioning detection, but also can perform all-round positioning detection on the circumferential weld defects of the steel pipe body 200.

[0052] Refer to the appendix Figure 3 , four telescopic rods 11 are fixedly connected to the top of the base 1, and the telescopic ends of the four telescopic rods 11 are all fixed to the bottom of the workbench 2. An X-shaped expansion frame group 12 is arranged between the base 1 and the workbench 2;

[0053] Through the telescopic drive of the X-shaped expansion frame group 12, the workbench 2 can be driven to move up and down. Through the upward drive of the workbench 2, the two positioning members 8 can be moved to both sides of the steel pipe body 200 to be detected for subsequent defect positioning work;

[0054] Through the downward movement of the workbench 2, the two positioning members 8 can be contracted downward from the position of the steel pipe body 200 after the detection is completed, and cooperate with the movement of the equipment to carry out the defect positioning work of the next group of steel pipe bodies 200;

[0055] An electric cylinder 13 for expanding and contracting the X-shaped expansion frame group 12 is installed on the top of the base 1;

[0056] The electric cylinder 13 is connected to an external power supply and a control switch, and is used to drive the X-shaped expansion frame group 12 to expand for facilitating the expansion drive of the workbench 2.

[0057] Refer to the appendix Figures 6 to 10 , the positioning member 8 includes a bracket group 83 fixed to the top of the U-shaped frame 3 and the sliding frame 4. Both ends of the bracket group 83 are fixedly connected with arc-shaped plates 81, and at least two groups of symmetric guide rollers 82 are rotatably connected to the inner sides of the two arc-shaped plates 81;

[0058] The positioning member 8 includes two arc-shaped plates 81 mounted on the U-shaped frame 3 and the sliding frame 4 through a bracket group 83, so that when the U-shaped frame 3 is driven to move laterally by the driving assembly 9, the two arc-shaped plates 81 can be driven to move laterally synchronously by the U-shaped frame 3, and then the steel pipe body 200 supported on the top of the U-shaped support frame 100 can be pushed, so that the steel pipe body 200 rolls on the top of the U-shaped support frame 100;

[0059] By rotatably connecting at least two groups of symmetrical guide rollers 82 on the inner side of the arc plate 81, not only can the steel pipe body 200 be positioned during the rolling process, but also the normal rolling of the steel pipe body 200 is not hindered, thereby ensuring the fluidity of the steel pipe body 200 during rolling and improving the effect of subsequent defect positioning.

[0060] Refer to the attached Figure 3 , Figure 4 , Figure 6 and Figure 7 A spring group 14 is fixedly connected to one side of the top of the workbench 2 through a fixed frame, and one end of the spring group 14 is fixedly connected to the outer side surface of the sliding frame 4;

[0061] The spring group 14 includes at least two springs. The elastic force of the spring group 14 itself can elastically squeeze the sliding frame 4, which not only allows the sliding frame 4 to always be in an expanded state, facilitating the subsequent movement of the steel pipe body 200, but also facilitates when the positioning piece 8 on the U-shaped frame 3 drives the steel pipe body 200 to prevent the steel pipe body 200 from self-rolling, resulting in the ultrasonic detection module 6 being unable to effectively perform all-round defect positioning work, thereby ensuring the orderliness of the steel pipe body 200 when rolling.

[0062] Refer to the attached Figure 5 and Figure 10 The driving assembly 9 includes a screw rod 91 rotatably connected to the bottom of the workbench 2 through a bracket, a threaded rack 92 is threadedly connected to the outer surface of the screw rod 91, the top of the threaded rack 92 is fixedly connected to the bottom of the U-shaped rack 3, and a sliding groove for driving the threaded rack 92 left and right is provided on the top of the workbench 2;

[0063] The rotation of the screw rod 91 can drive the threaded frame 92 to move left and right, and the left and right movement of the threaded frame 92 can drive the U-shaped frame 3 fixed thereto to move left and right, and then the positioning member 8 on the top of the U-shaped frame 3 can push the steel pipe body 200 on the top of the U-shaped support frame 100, so that the steel pipe body 200 rolls on the top of the U-shaped support frame 100, so that the ultrasonic detection module 6 can perform all-round defect positioning work;

[0064] By providing the sliding groove, it is not only convenient for the fixed connection between the threaded frame 92 and the U-shaped frame 3, but also convenient for guiding the left-right sliding of the threaded frame 92;

[0065] One side of the bottom of the workbench 2 is fixedly connected with a motor 93 for driving the forward and reverse rotation of the lead screw 91;

[0066] The motor 93 is connected to an external power supply and a control switch. It is a forward and reverse motor, and is set using the connection method and coding method of the existing technology to drive the forward and reverse rotation of the lead screw 91.

[0067] Embodiment 2: Different from Embodiment 1;

[0068] Refer to the appendix Figure 8 and Figure 9 , the bracket group 83 includes a square tube 831, and two extension frames 832 are inserted into the interior of the square tube 831. One ends of the two extension frames 832 are respectively fixedly connected to the outer sides of the two arc-shaped plates 81;

[0069] By including the square tube 831 and the two extension frames 832 inserted into the interior of the square tube 831 in the bracket group 83, it is convenient to adjust the distance between the two arc-shaped plates 81 by the telescopic adjustment of the two extension frames 832, thereby improving the smoothness and balance of the driving of the steel pipe body 200, and preventing the phenomenon that when the steel pipe body 200 is relatively long, the local position of the steel pipe body 200 is driven, resulting in the steel pipe body 200 tilting when rolling on the top of the U-shaped support frame 100, which affects the subsequent ultrasonic defect positioning work.

[0070] A number of locking ports 833 are provided in the interior of the square tube 831. T-shaped pins 834 for inserting into the interior of the locking ports 833 are slidably connected to the interiors of the other ends of the two extension frames 832, and elastic members 835 for elastically pressing the T-shaped pins 834 are fixedly connected to the interiors of the other ends of the two extension frames 832;

[0071] Through the elastic pressing of the T-shaped pins 834 by the elastic members 835, the T-shaped pins 834 are inserted into the corresponding locking ports 833 to ensure the stability of the square tube 831 after telescoping;

[0072] The elastic member 835 includes elastic components such as V-shaped metal elastic sheets, springs, and elastic materials.

[0073] Embodiment 3: Different from Embodiment 1;

[0074] Refer to the appendix Figure 9 and Figure 10 , two toggling members 10 are connected to the top of the positioning member 8 located on the U-shaped frame 3;

[0075] By installing two toggling members 10 on the positioning member 8 on the U-shaped frame 3, when the gap between two steel pipe bodies 200 to be detected is small, it is convenient to form a fine adjustment of the position of the steel pipe body 200 through the pre-insertion of the toggling member 10 and the lateral movement of the U-shaped frame 3, thereby facilitating the insertion of the U-shaped frame 3 and the positioning member 8 above, and forming subsequent positioning detection work;

[0076] The toggling member 10 includes a U-shaped block 101. An insertion block 102 is rotatably connected inside the U-shaped block 101 through a rotating shaft. A torsion spring 103 is installed at the rotating end of the insertion block 102. One side of the U-shaped block 101 is fixedly connected with a U-shaped limiting block 104 for limiting the vertically upward insertion block 102;

[0077] The U-shaped block 101 is fixed to the top of the bracket group 83. By installing the insertion block 102 inside the U-shaped block 101, it can be inserted between two steel pipe bodies 200 with a small gap, thereby facilitating the fine adjustment of the steel pipe body 200 to be detected, and thus facilitating the subsequent formation of the circumferential weld positioning detection work on the steel pipe body 200 through the lateral movement of the two groups of positioning members 8;

[0078] By installing the insertion block 102 in a rotating manner and vertically limiting the insertion block 102 through the U-shaped limiting block 104, it is ensured that the insertion block 102 always maintains a vertical state through the elastic force of the torsion spring 103 itself, thereby facilitating the insertion block 102 to better insert into the gap between the two steel pipe bodies 200. Moreover, in cooperation with the feeding of the detection device, the insertion block 102 can form an angular fold according to the obstruction of the steel pipe body 200, further improving the use effect of toggling the steel pipe body 200.

[0079] It should be noted that the term "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0080] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultrasonic defect positioning device for the circumferential weld of a pipeline, characterized in that, It includes a number of steel pipe bodies (200) supported by two groups of U-shaped support frames (100) and a detection mechanism (300) for detecting and positioning the circumferential welds on the steel pipe bodies (200). The detection mechanism (300) includes a movable base (1). A workbench (2) that can be driven up and down is arranged at the top of the base (1). A U-shaped frame (3) and a sliding frame (4) are respectively slidably connected to the top of the workbench (2). An installation frame (5) is fixedly connected to the inner side of the sliding frame (4). And an ultrasonic detection module (6) for detecting the steel pipe body (200) that rolls on the top of the U-shaped support frame (100) and an inkjet module (7) for positioning the circumferential weld defect positions are fixedly connected to one side of the installation frame (5). Positioning members (8) for positioning the steel pipe body (200) are arranged at the tops of both the U-shaped frame (3) and the sliding frame (4). A driving component (9) for driving the U-shaped frame (3) left and right is arranged at the bottom of the workbench (2).

2. The ultrasonic defect positioning device for the circumferential weld of a pipeline according to claim 1, characterized in that: Four telescopic rods (11) are fixedly connected to the top of the base (1), and the telescopic ends of the four telescopic rods (11) are all fixed to the bottom of the workbench (2). An X-shaped expansion frame group (12) is arranged between the base (1) and the workbench (2). An electric cylinder (13) for stretching and contracting the X-shaped expansion frame group (12) is installed at the top of the base (1).

3. The ultrasonic defect positioning device for the circumferential weld of a pipeline according to claim 1, wherein: The positioning member (8) includes a bracket group (83) fixed to the tops of the U-shaped frame (3) and the sliding frame (4). Arc-shaped plates (81) are fixedly connected to both ends of the bracket group (83). At least two groups of symmetrically arranged guide rollers (82) are rotatably connected to the inner sides of the two arc-shaped plates (81).

4. A pipeline girth weld ultrasonic defect positioning device according to claim 3, characterized in that: A spring group (14) is fixedly connected to one side of the top of the workbench (2) through a fixing frame, and one end of the spring group (14) is fixedly connected to the outer side of the sliding frame (4).

5. The ultrasonic defect positioning device for the circumferential weld of a pipeline according to claim 1, characterized in that: The driving component (9) includes a lead screw (91) rotatably connected to the bottom of the workbench (2) through a bracket. A threaded frame (92) is threadedly connected to the outer surface of the lead screw (91). The top of the threaded frame (92) is fixedly connected to the bottom of the U-shaped frame (3). A sliding groove for driving the threaded frame (92) left and right is opened at the top of the workbench (2). A motor (93) for driving the lead screw (91) to rotate forward and backward is fixedly connected to one side of the bottom of the workbench (2).

6. The ultrasonic defect positioning device for the circumferential weld of a pipeline according to claim 3, characterized in that: The bracket group (83) includes a square pipe (831). Two expansion frames (832) are inserted into the inside of the square pipe (831). One ends of the two expansion frames (832) are respectively fixedly connected to the outer sides of the two arc-shaped plates (81).

7. The ultrasonic defect positioning device for the circumferential weld of a pipeline according to claim 6, wherein: A number of locking openings (833) are opened in the inside of the square pipe (831). T-shaped pins (834) for inserting into the inside of the locking openings (833) are slidably connected to the inside of the other ends of the two expansion frames (832). And elastic members (835) for elastically extruding the T-shaped pins (834) are fixedly connected to the inside of the other ends of the two expansion frames (832).

8. The ultrasonic defect positioning device for the circumferential weld of a pipeline according to claim 1, wherein: Two toggling members (10) are connected to the top of the positioning member (8) located on the U-shaped frame (3); The toggling member (10) includes a U-shaped block (101). An inserting block (102) is rotatably connected inside the U-shaped block (101) through a rotating shaft. A torsion spring (103) is installed at the rotating end of the inserting block (102). A U-shaped limiting block (104) for limiting the inserting block (102) vertically upward is fixedly connected to one side of the U-shaped block (101).

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