Gas pipeline defect detector

Abstract

The utility model belongs to the technical field of pipeline detection, and particularly relates to a gas pipeline defect detector. Comprising a base, the base is provided with a clamping part for horizontally placing a to-be-detected pipe fitting, the to-be-detected pipe fitting is erected on the clamping part, the base is provided with a supporting plate, the supporting plate is slidably provided with a detection part in the length direction of the to-be-detected pipe fitting, the detection part comprises a supporting frame slidably connected with the supporting plate, and the supporting frame is rotatably connected with an external detection part. The outer detection part is magnetically connected with an inner detection part, and the inner detection part and the outer detection part are arranged on the inner side and the outer side of the to-be-detected pipe fitting respectively and can perform bidirectional detection on the to-be-detected pipe fitting in the radial direction; the detection component comprises an inner detection component and an outer detection component which are arranged on the inner side and the outer side of the to-be-detected pipe fitting respectively, the detection component can conduct bidirectional detection on the to-be-detected pipe fitting in the radial direction in the moving process, and the position and the size of the defect can be more accurately determined through internal and external bidirectional ultrasonic signal feedback.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pipeline detection technical field especially relates to a gas pipeline defect detector. BACKGROUND

[0002] The existing gas pipeline defect detection device, such as the Chinese utility model patent with the publication number CN221801308U discloses a pipeline outer wall defect detection device, including base and the mobile ring of being located above base, the one side of mobile ring is rotatably connected with the rotating ring through the bearing, the upper portion of rotating ring inner chamber is fixedly installed with detection block, the rear portion of base top is provided with drive mechanism, the upper portion of drive mechanism is provided with sliding rod, the outer surface of sliding rod is slidably connected with sliding sleeve, the outer surface of sliding sleeve and the outer surface between mobile ring are fixedly connected with sliding plate, the upper portion of sliding plate is provided with first transmission mechanism, the one side of sliding plate is fixedly connected with connecting plate, the upper portion of connecting plate is provided with the second transmission mechanism that is adapted with first transmission mechanism.In the gas pipeline detection, the conventional one-way ultrasonic flaw detection mainly carries out around the pipeline outer wall, and this kind of mode can discover some external defects, but for the fine crack, corrosion or welding defect in the pipeline interior, it can not be comprehensively detected. SUMMARY

[0003] The utility model discloses to solve the technical problem existing in the prior art, provide a kind of gas pipeline defect detector, detection component includes respectively setting in the inner and outer two sides of the pipe to be measured inner measuring component and outer measuring component, detection component can be bidirectional detection to the pipe to be measured along radial direction in the movement process, by the feedback of ultrasonic wave signal in the inner and outer two directions, the position and size of defect can be more accurately determined.

[0004] Therefore, the utility model provides a kind of gas pipeline defect detector, including base, base is provided with the clamping component of pipe to be measured horizontal placement, clamping component is set with pipe to be measured, the base is provided with support plate, support plate is slidably provided with detection component along the length direction of pipe to be measured, detection component includes and the support frame of support plate sliding connection, support frame is rotatably connected with outer measuring component, outer measuring component magnetically connects with inner measuring component, inner measuring component and outer measuring component are respectively set in the inner and outer two sides of pipe to be measured, can be bidirectional detection to the pipe to be measured along radial direction.

[0005] In the technical solution, the detection component can slide along the length direction of the pipe to be detected, and the detection component comprises an inner detection component and an outer detection component arranged on the inner and outer sides of the pipe to be detected respectively, the detection component can detect the pipe to be detected in the radial direction during movement, and the position and size of the defect can be determined more accurately through the feedback of the ultrasonic signals in the inner and outer directions, when the pipe has a multi-layer structure or a defect with a complex shape inside, the bidirectional detection can obtain information from different angles, which helps to determine the specific position and range of the defect more accurately, and provides a more accurate basis for subsequent maintenance and treatment.

[0006] In the above technical solution, further, the support plate is provided with a first sliding groove arranged along the length direction of the pipe to be detected, the support frame is provided with a sliding block penetrating through the first sliding groove, the sliding block is threadedly connected with a first threaded rod parallel to the first sliding groove, the first threaded rod is rotationally arranged on a fixed seat block fixedly arranged on the support frame, and the first threaded rod is in transmission connection with the first motor.

[0007] In the above technical solution, further, the outer detection component comprises an installation cylinder with a radial length greater than that of the pipe to be detected, the inner wall of the installation cylinder is provided with a detection block, the first ring groove is arranged on the outer surface of the installation cylinder in the circumferential direction, the support frame is provided with a support ring body corresponding to the first sliding groove, the support ring body rotationally abuts against the first ring groove, the support ring body coincides with the central axis of the pipe to be detected, and the installation cylinder is connected with a driving component.

[0008] In the above technical solution, further, the driving component comprises a second motor, the second motor is fixedly arranged in a motor mounting sleeve fixedly arranged on the support frame, the output end of the second motor is coaxially connected with a first pulley, the second ring groove is arranged on the outer surface of the installation cylinder in the circumferential direction, and the second ring groove and the first pulley are in transmission connection with a transmission belt.

[0009] In the above technical solution, further, the inner detection component comprises an installation ring with a radial length smaller than that of the pipe to be detected, the outer wall of the installation ring is provided with a detection block, and at least one set of magnetic connection components are arranged on the installation ring and the installation cylinder.

[0010] In the technical solution, the second motor, the first pulley, the transmission belt and the second ring groove on the installation cylinder are arranged, the installation cylinder can be driven to rotate by the second motor, the detection blocks are arranged on the installation ring and the installation cylinder respectively, and at least one set of magnetic connection components are arranged, so that the installation ring and the installation cylinder can be driven to rotate synchronously, the installation ring and the installation cylinder can be driven to move along the length direction of the pipe to be detected when the support frame moves, and comprehensive ultrasonic detection can be performed in the inner and outer directions of the gas pipe.

[0011] Further in the technical scheme, the magnetic connecting component comprises a first connecting block, the first connecting block is fixedly connected to the mounting ring, a second connecting block is arranged on the one side end of the mounting cylinder body corresponding to the first connecting block, and the first connecting block and the second connecting block are respectively embedded with a first magnetic block and a second magnetic block.

[0012] In the technical scheme, the magnetic connecting component is arranged at two positions in the embodiment, so that the magnetic connection force is uniformly and stably borne, and in other embodiments, the magnetic connecting component can be arranged at multiple positions in a circle and symmetrically arranged on the mounting ring and the mounting cylinder body, the first connecting block is arranged for the mounting ring to pass through, and the second connecting block is laterally slotted and clamped with the mounting cylinder body and fixed by bolts.

[0013] Further in the technical scheme, the magnetic connecting component and the detection block are arranged at intervals.

[0014] In the technical scheme, the magnetic connecting component and the detection block are arranged at intervals.

[0015] Further in the technical scheme, the clamping component comprises a support pedestal symmetrically and slidably arranged on the base, a U-shaped top frame is arranged on the top of the support pedestal, and the support pedestal comprises a mechanical clamping arm extending from the top wall of the support pedestal, and the mechanical clamping arm and the top frame can form three-point fixed clamping on the pipe to be detected.

[0016] In the technical scheme, the mechanical clamping arm is a mature existing technology, and thus will not be described in detail, the mechanical clamping arm extends upward from the support pedestal and can cooperate with the top frame to clamp the pipe to be detected, the contact points of the pipe to be detected, the mechanical clamping arm and the top frame are three, and stable clamping can be formed.

[0017] Further in the technical scheme, a second sliding groove is arranged on the base along the length direction of the pipe to be detected, a first sliding block is arranged at the bottom of the support pedestal and slides in the second sliding groove, the first sliding block passes through the second sliding groove, enters the support pedestal, and is threadedly connected with a bidirectional screw rod, the bidirectional screw rod is rotationally arranged in the support pedestal and is in the same direction as the length direction of the second sliding groove, and one end of the bidirectional screw rod passes out of the support pedestal and is threadedly connected with a third motor.

[0018] In the technical scheme, the support pedestal and the base are slidably connected, the sliding rail and the sliding block are used for sliding arrangement, the sliding rail extends along the length direction of the second sliding groove, and the third motor is used to drive the two support pedestals on the base to move close to or away from each other, so as to meet the clamping requirements of pipe pieces of different specifications.

[0019] Further in the technical scheme, the top frame and the mechanical clamping arm are both provided with a flexible layer on the abutting surface of the pipe to be detected.

[0020] In the technical solution, the flexible layer can be made of rubber material, so that mechanical damage to the clamping surface of the pipe to be detected can be avoided when the pipe to be detected is clamped by the clamping component.

[0021] The utility model discloses the beneficial effects are:

[0022] 1. The detection component can slide along the length direction of the pipe to be detected, and the detection component includes an inner detection component and an outer detection component arranged on the inner and outer sides of the pipe to be detected respectively. The detection component can detect the pipe to be detected in the radial direction during movement. Through the feedback of the ultrasonic signals in the inner and outer directions, the position and size of the defect can be determined more accurately. When there are multiple layers of structures or complex-shaped defects inside the pipe, the bidirectional flaw detection can obtain information from different angles, which helps to determine the specific position and range of the defect more accurately, and provides more accurate basis for subsequent maintenance and treatment.

[0023] 2. The support pedestal and the base are slidingly connected, and are slidingly arranged through the sliding rail sliding block. The sliding rail extends along the length direction of the second sliding groove. The two support pedestals on the pedestal are driven by the third motor to move closer to or away from each other, thereby meeting the clamping requirements of pipes of different specifications. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of the utility model;

[0025] Figure 2 is a structural schematic diagram of another view of the utility model;

[0026] Figure 3 is a structural schematic diagram of the detection component;

[0027] Figure 4 is an exploded structural schematic diagram of the detection component;

[0028] Figure 5 is a detection component and a partial enlarged view thereof;

[0029] Figure 6 is an internal structural schematic diagram of the base.

[0030] The marks in the figure represent:

[0031] 1, base; 2, pipe to be tested; 3, clamping part; 4, support plate; 5, detection part; 6, support frame; 7, outer detection part; 8, inner detection part; 9, first sliding groove; 10, sliding block; 11, first threaded rod; 12, fixed seat block; 13, first motor; 14, mounting cylinder; 15, detection block; 16, first ring groove; 17, support ring body; 18, driving part; 19, second motor; 20, mounting sleeve; 21, first pulley; 22, second ring groove; 23, transmission belt; 24, mounting ring; 25, magnetic connection part; 26, first connecting block; 27, second connecting block; 28, first magnetic block; 29, second magnetic block; 30, support pedestal; 31, top frame; 32, mechanical clamping arm; 33, second sliding groove; 34, first sliding block; 35, bidirectional screw rod; 36, third motor. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0033] In the description of the present application, it should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The techniques, methods and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so further discussion is not necessary in subsequent drawings once an item is defined in one drawing.

[0034] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not intended to describe a specific order or chronological sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a class, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0035] It should be noted that, in the description of the present application, the orientation or position relationship indicated by the terms such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" is generally based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description. Without the opposite indication, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation terms "inner, outer" refer to the inner and outer of the contour of each component itself.

[0036] It should be noted that in the present application, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the sentence "includes a" does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method can be performed in an order different from the described order, and various steps can also be added, omitted or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0037] First embodiment:

[0038] As Figures 1-6 shown, the present embodiment provides a gas pipeline defect detector, which comprises a base 1, a clamping part 3 for horizontally placing a to-be-tested pipe 2 is arranged on the base 1, the to-be-tested pipe 2 is arranged on the clamping part 3, a supporting plate 4 is arranged on the base 1, a detection part 5 is slidingly arranged on the supporting plate 4 along the length direction of the to-be-tested pipe, the detection part 5 comprises a supporting frame 6 slidingly connected with the supporting plate 4, an outer detection part 7 is rotatably connected with the supporting frame 6, an inner detection part 8 is magnetically connected with the outer detection part 7, the inner detection part 8 and the outer detection part 7 are arranged on the inner and outer sides of the to-be-tested pipe 2 respectively, and the to-be-tested pipe 2 can be bidirectionally detected along the radial direction.

[0039] The detection component 5 can slide along the length direction of the pipe to be detected, and the detection component 5 includes the inner detection component 8 and the outer detection component 7 arranged on the inner and outer sides of the pipe to be detected 2 respectively, and the detection component 5 can detect the pipe to be detected 2 in the radial direction during movement, and the position and size of the defect can be determined more accurately through the feedback of the ultrasonic signals in the inner and outer directions, and when there are multiple layers or complex shape defects in the pipe, the bidirectional detection can obtain information from different angles, which helps to more accurately determine the specific position and range of the defect, and provides more accurate basis for subsequent repair and processing.

[0040] As shown in Figure 2 , the support plate 4 is provided with a first sliding groove 9 along the length direction of the pipe to be detected 2, the support frame 6 is provided with a sliding block 10 penetrating through the first sliding groove 9, the sliding block 10 is threadedly connected with a first threaded rod 11 parallel to the first sliding groove 9, the first threaded rod 11 is rotationally arranged on the fixed seat block 12 fixedly arranged on the support frame 6, and the first threaded rod 11 is in transmission connection with the first motor 13.

[0041] As shown in Figures 3-5 , the outer detection component 7 includes an installation cylinder 14 with a radial length greater than that of the pipe to be detected 2, the inner wall of the installation cylinder 14 is provided with a detection block 15, the first ring groove 16 is arranged on the outer surface of the installation cylinder 14 in the circumferential direction, the support ring body 17 is arranged on the support frame 6 corresponding to the first sliding groove 9, the support ring body 17 and the first ring groove 16 rotationally abut, the support ring body 17 coincides with the central axis of the pipe to be detected 2, the installation cylinder 14 is connected with a driving component 18, and the driving component 18 drives the installation cylinder 14 to rotate based on the support ring body 17. The detection block 15 is an ultrasonic flaw detector, which belongs to the prior art, and will not be described in detail.

[0042] The driving component 18 includes a second motor 19, the second motor 19 is fixedly arranged in the motor mounting sleeve 20 fixedly arranged on the support frame 6, the output end of the second motor 19 is coaxially connected with a first pulley 21, the second ring groove 22 is arranged on the outer surface of the installation cylinder 14 in the circumferential direction, and the second ring groove 22 and the first pulley 21 are in transmission connection with a transmission belt 23.

[0043] As shown in Figures 3-5 , the inner detection component 8 includes an installation ring 24 with a radial length smaller than that of the pipe to be detected 2, the outer wall of the installation ring 24 is provided with a detection block 15, and at least one set of magnetic connection components 25 is arranged on the installation ring 24 and the installation cylinder 14.

[0044] The second motor 19, the first pulley 21, the transmission belt 23 and the second ring groove 22 provided on the mounting cylinder 14 can drive the mounting cylinder 14 to rotate through the second motor 19. The mounting ring 24 and the mounting cylinder 14 are respectively provided with detection blocks 15 and at least one set of magnetic connecting components 25, which can drive the mounting ring 24 and the mounting cylinder to rotate synchronously. When the support frame 6 moves, the mounting ring 24 and the mounting cylinder are driven to move along the length direction of the pipe to be detected 2, so that comprehensive ultrasonic detection can be performed in the gas pipeline in both directions.

[0045] As shown in Figure 5 The magnetic connecting component 25 includes a first connecting block 26 fixedly connected to the mounting ring 24. The mounting cylinder 14 is provided with a second connecting block 27 corresponding to the first connecting block 26 at one side end. The first connecting block 26 and the second connecting block 27 are respectively embedded with a first magnetic block 28 and a second magnetic block 29.

[0046] In the embodiment, the magnetic connecting component 25 is provided at two positions to ensure that the magnetic connection is uniformly and stably stressed. In other embodiments, the magnetic connecting component 25 can be provided at multiple positions around the circumference and symmetrically arranged on the mounting ring 24 and the mounting cylinder 14. The first connecting block 26 is provided for the mounting ring 24 to pass through. The second connecting block 27 is laterally slotted and clamped with the mounting cylinder 14 and fixed by bolts.

[0047] The magnetic connecting component 25 and the detection block 15 are arranged at intervals to avoid interference with the detection block 15.

[0048] Second embodiment:

[0049] The embodiment provides a gas pipeline defect detector. In addition to the technical solutions of the above-mentioned embodiments, the gas pipeline defect detector has the following technical features.

[0050] As shown in Figure 1 and Figure 6 The clamping component 3 includes a support pedestal 30 symmetrically and slidably arranged on the base 1. The support pedestal 30 is provided with a "U"-shaped top frame 31 at the top. The clamping component 3 includes a mechanical clamping arm 32 extending out of the top wall of the support pedestal 30. The mechanical clamping arm 32 and the top frame 31 can form a three-point fixed clamping on the pipe to be detected 2.

[0051] The mechanical clamping arm 32 is a mature prior art, and thus will not be described in detail. The mechanical clamping arm 32 extends upward from the support pedestal 30 to clamp the pipe to be detected 2 in cooperation with the top frame 31. The pipe to be detected 2 has three contact points with the mechanical clamping arm 32 and the top frame 31, so that stable clamping can be formed.

[0052] The second sliding groove 33 is arranged on the base 1 along the length direction of the pipe 2 to be tested, the first sliding block 34 is arranged at the bottom of the support pedestal 30 and slides in the second sliding groove 33, the first sliding block 34 penetrates the second sliding groove 33 and is threadedly connected with the bidirectional screw rod 35 in the support pedestal 30, the bidirectional screw rod 35 is arranged in the support pedestal 30 and is in the same direction as the length direction of the second sliding groove 33, and one end of the bidirectional screw rod 35 penetrates the support pedestal 30 and is threadedly connected with the third motor 36.

[0053] The support pedestal 30 is slidably connected with the base 1, is arranged through the sliding rail sliding block, the sliding rail extends along the length direction of the second sliding groove 33, the two support pedestals 30 on the support pedestal 30 are driven by the third motor 36 to be close to or away from each other, thereby meeting the clamping requirements of pipe fittings of different specifications.

[0054] The top frame 31 and the mechanical clamping arm 32 are both provided with flexible layers on the abutting surfaces of the pipe 2 to be tested. The flexible layers can be made of rubber material, which can avoid mechanical damage to the clamping surface of the pipe 2 to be tested when the pipe 2 to be tested is clamped by the clamping part 3.

[0055] The embodiments of the application are described above in combination with the drawings, the embodiments and the features in the embodiments in the application can be combined with each other without conflict, the application is not limited to the above specific embodiments, the above specific embodiments are only illustrative and not restrictive, and a person skilled in the art can make many forms under the inspiration of the application without departing from the scope of the application and the protection scope of the claims, and all the forms belong to the protection scope of the application.

Claims

1. A gas pipeline defect detector, comprising a base (1), a clamping part (3) is arranged on the base (1), the clamping part (3) is used for horizontally placing a pipe to be detected (2), and the pipe to be detected (2) is arranged on the clamping part (3), characterized in that, The base (1) is provided with a support plate (4), the support plate (4) is slidably provided with a detection component (5) along the length direction of the pipe to be detected, the detection component (5) comprises a support frame (6) slidably connected with the support plate (4), the support frame (6) is rotatably connected with an outer detection component (7), the outer detection component (7) is magnetically connected with an inner detection component (8), the inner detection component (8) and the outer detection component (7) are arranged on the inner and outer sides of the pipe to be detected (2) respectively, and the pipe to be detected (2) can be bidirectionally detected along the radial direction.

2. The gas pipeline defect detector according to claim 1, characterized in that, The support plate (4) is provided with a first sliding groove (9) opened along the length direction of the pipe to be detected (2), the support frame (6) is provided with a sliding block (10) penetrating through the first sliding groove (9), the sliding block (10) is threadedly connected with a first threaded rod (11) penetrating through the first sliding groove (9), the first threaded rod (11) is rotatably arranged on the fixed seat block (12) fixedly arranged on the support frame (6), and the first threaded rod (11) is drivingly connected with a first motor (13).

3. A gas pipeline defect detector according to claim 2, characterized in that, The outer detection component (7) comprises an installation cylinder (14) with a radial length greater than that of the pipe to be detected (2), the inner wall of the installation cylinder (14) is provided with a detection block (15), the installation cylinder (14) is provided with a first ring groove (16) circumferentially arranged on the outer surface of the cylinder, the support frame (6) is provided with a support ring body (17) corresponding to the first sliding groove (9), the support ring body (17) and the first ring groove (16) are rotatably abutted, the support ring body (17) and the central axis of the pipe to be detected (2) coincide, and the installation cylinder (14) is connected with a driving component (18), the driving component (18) drives the installation cylinder (14) to rotate based on the support ring body (17).

4. The gas pipeline defect detector according to claim 3, characterized in that, The driving component (18) comprises a second motor (19), the second motor (19) is fixedly arranged in a motor mounting sleeve (20) fixedly arranged on the support frame (6), the output end of the second motor (19) is coaxially connected with a first pulley (21), the outer surface of the installation cylinder (14) is circumferentially provided with a second ring groove (22), and the second ring groove (22) and the first pulley (21) are drivingly connected with a transmission belt (23).

5. The gas pipeline defect detector according to claim 2, characterized in that, The inner detection component (8) comprises an installation ring (24) with a radial length smaller than that of the pipe to be detected (2), the outer wall of the installation ring (24) is provided with a detection block (15), and at least one set of magnetic connection components (25) are arranged on the installation ring (24) and the installation cylinder (14).

6. A gas pipeline defect detector according to claim 5, characterized in that, The magnetic connection component (25) comprises a first connecting block (26), the first connecting block (26) is fixedly connected to the installation ring (24), a second connecting block (27) is arranged on one side end of the installation cylinder (14) corresponding to the first connecting block (26), and the first connecting block (26) and the second connecting block (27) are respectively embedded with a first magnetic block (28) and a second magnetic block (29) correspondingly.

7. A gas pipeline defect detector according to claim 6, characterized in that, The magnetic connection component (25) and the detection block (15) are arranged at intervals.

8. The gas pipeline defect detector according to claim 1, characterized in that, The clamping component (3) comprises a support pedestal (30) symmetrically slidingly arranged on the base (1), a "U"-shaped top frame (31) is arranged on the top of the support pedestal (30), and a mechanical clamping arm (32) extending out of the top wall of the support pedestal (30) is arranged on the top frame (31), and the mechanical clamping arm (32) and the top frame (31) can form a three-point fixed clamping on the pipe (2) to be measured.

9. A gas pipeline defect detector according to claim 8, characterized in that, A second sliding groove (33) is arranged on the base (1) along the length direction of the pipe (2) to be measured, a first sliding block (34) slidingly arranged in the second sliding groove (33) is arranged on the bottom of the support pedestal (30), the first sliding block (34) penetrates through the second sliding groove (33) into the support pedestal (30) and is threadedly connected with a bidirectional screw rod (35), the bidirectional screw rod (35) is rotationally arranged in the support pedestal (30) and is in the same direction as the length direction of the second sliding groove (33), and one end of the bidirectional screw rod (35) penetrates out of the support pedestal (30) and is threadedly connected with a third motor (36).

10. The gas pipeline defect detector according to claim 9, characterized in that, The top frame (31) and the mechanical clamping arm (32) are both provided with a flexible layer on the abutting surface of the pipe (2) to be measured.

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