Tandem mechanism applied to steel pipe welding seam flaw detection
By designing a series mechanism including a weld centering mechanism, an adjustment mechanism and a series probe mounting base, the problem that ultrasonic probes cannot adapt to steel pipes of different diameters in the prior art is solved, and accurate positioning of the welds and high-accuracy flaw detection are achieved.
Patent Information
- Application Number
- CN202421868578.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-05
AI Technical Summary
During the flaw detection process of welded steel pipes, existing ultrasonic probes cannot effectively adapt to steel pipes of different diameters, resulting in inaccurate positioning and inaccurate flaw detection results.
A tandem mechanism applied to the detection of steel pipe welds is designed, including a weld centering mechanism, an adjustment mechanism and a tandem probe mounting base. The weld centering mechanism is close to the outer wall of the steel pipe through the roller and spring structure, and the adjustment mechanism adjusts the position and angle of the probe mounting base through the left and right adjustment handwheel and slider structure to adapt to steel pipes of different diameters.
It realizes accurate positioning and flaw detection of welds of steel pipes of different diameters, improves the accuracy and adaptability of flaw detection, and is suitable for steel pipes with ovality and unevenness.
Smart Images
Figure CN222994396U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a tandem mechanism, in particular to a tandem mechanism applied to steel pipe weld flaw detection, belonging to the technical field of steel pipe weld flaw detection. Background Art
[0002] Welded steel pipes are widely used in projects such as oil and gas long-distance pipeline projects, municipal heating pipe networks, urban drinking water, and water supply pipe networks. Therefore, the quality of welded pipes is crucial. During the production process of welded pipes, the quality of the welds of welded pipes is one of the most critical finished product qualities. Various standards require flaw detection of different proportions of the welds of welded pipes. Common flaw detection methods include: X-ray flaw detection, ultrasonic flaw detection, magnetic particle flaw detection, penetrant flaw detection, eddy current flaw detection, γ-ray flaw detection, etc. Ultrasonic flaw detection is a commonly used flaw detection method. It emits ultrasonic waves to the object to be detected, and then uses its reflection, Doppler effect, transmission, etc. to obtain information inside the object to be detected and form an image after processing.
[0003] With the change of the diameter of welded steel pipes, the distance of the current ultrasonic probe is fixed and non-adjustable, which brings inconvenience to the operation, is not conducive to the progress of detection flaw detection, and reduces the accuracy of data.
[0004] There may be welding defects in the welds of welded steel pipes. If the welded pipes are detected in a fixed direction, especially welded pipes of different diameters, the probe cannot be well aligned with the weld position of the welded pipe, the weld cannot be centered, the positioning is not accurate enough, and deviations are likely to occur during flaw detection. Moreover, there is a certain degree of ovality and unevenness on its outside, so it will have an adverse impact on ultrasonic flaw detection.
[0005] Therefore, developing a tandem mechanism applied to steel pipe weld flaw detection that can overcome the above defects has become an urgent technical problem for those skilled in the art. Content of the Utility Model
[0006] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a tandem mechanism applied to steel pipe weld flaw detection. The tandem mechanism has a simple structure, is easy to use, has strong adjustability, good centering effect, and more accurate detection results.
[0007] To solve the above technical problems, the present utility model provides a tandem mechanism applied to steel pipe weld flaw detection, which includes a weld centering mechanism, an adjustment mechanism, and a tandem probe mounting seat. The weld centering mechanism is located at the upper end of the steel pipe and is arranged along the length direction of the steel pipe weld. The adjustment mechanism includes a left adjustment mechanism and a right adjustment mechanism arranged left and right. The left adjustment mechanism and the right adjustment mechanism are respectively arranged on both sides of the weld centering mechanism. The ends of the left adjustment mechanism and the right adjustment mechanism are respectively connected with a tandem probe mounting seat. The tandem probe mounting seat is arranged in contact with the outer wall of the steel pipe. After the weld centering mechanism centers the weld, the left adjustment mechanism and the right adjustment mechanism drive the corresponding tandem probe mounting seats to move and adjust on the outer wall of the steel pipe;
[0008] The weld centering mechanism includes an outer bracket and an inner bracket. The inner bracket is arranged inside the outer bracket. Four corners of the bottom end of the inner bracket are respectively provided with a roller through a roller bracket. The weld centering mechanism is movably arranged on the outer wall of the steel pipe through the rollers at the lower end of the inner bracket. Four corners of the upper end of the inner bracket are respectively connected with the outer bracket through springs. One side of the lower end of the inner bracket is movably connected with the outer bracket through a pin shaft. The left adjustment mechanism and the right adjustment mechanism are arranged left and right inside the inner bracket.
[0009] A further limited technical solution of the present utility model is:
[0010] Further, in the aforementioned tandem mechanism applied to steel pipe weld flaw detection, the left adjustment mechanism includes a left adjustment guide rail, a rotating rod seat, a left slider, and a left adjustment handwheel. The rotating rod seat is connected with the left adjustment guide rail through a universal joint. A left adjustment handwheel for adjustment is provided on the side of the rotating rod seat far from the left adjustment guide rail. A left slider is arranged on the left adjustment guide rail. The end of the left slider is provided with a tandem probe mounting seat;
[0011] The right adjustment mechanism includes a right adjustment guide rail, a right slider, and a right adjustment handwheel. A right adjustment handwheel for adjustment is provided at the end of the right adjustment guide rail far from the left adjustment guide rail. The right slider is arranged on the right adjustment guide rail. The end of the right slider is provided with a tandem probe mounting seat;
[0012] By adjusting the left adjustment handwheel and the right adjustment handwheel, the two tandem probe mounting seats are made to closely adhere to the outer wall of the steel pipe to adapt to steel pipes of different diameters.
[0013] Technical effect: The present utility model is provided with an adjustment mechanism on the centering mechanism, and the adjustment mechanism includes a right adjustment mechanism and a left adjustment mechanism, which can meet the adjustment of the distance between the two groups of probes to adapt to steel pipes of different diameters. Moreover, the adjustment structure can also quickly realize the adjustment of the weld centering of the tandem mechanism, with stronger applicability and improved flaw detection accuracy.
[0014] In the aforementioned tandem mechanism applied to steel pipe weld flaw detection, the rotating rod seat and the right adjustment mechanism are located on the same side of the weld centering mechanism.
[0015] Technical effect: The right adjustment handwheel and the left adjustment handwheel are adjusted on the same side, and a maintenance platform may not be provided on the other side, which is convenient for maintenance.
[0016] In the tandem mechanism applied to steel pipe weld flaw detection described above, the lower ends of the left slider and the right slider are respectively connected with connection blocks through compression springs, and the lower ends of the connection blocks are movably connected with tandem probe mounting seats through pin shafts.
[0017] Technical effect: By arranging connection blocks through compression springs, the connection blocks can be adjusted up and down, so as to adjust the height of the tandem probe mounting seat up and down to adapt to steel pipes with different diameters.
[0018] In the tandem mechanism applied to steel pipe weld flaw detection described above, the tandem probe mounting seat includes a fixed seat, a probe seat, a probe fixing frame, a tandem probe, a limit block, a moving block, a swing frame and a wear-resistant block. One side of the swing frame is movably connected with an adjustment mechanism through a pin shaft. The other side of the swing frame is concave to form a groove, and a fixed seat is hinged in the groove. Strip-shaped holes are respectively opened on both sides of the fixed seat along its length direction. Two probe seats are movably arranged in the fixed seat. A rotating shaft is inserted through each probe seat, and the probe seat rotates on the rotating shaft. The two ends of the rotating shaft penetrate through the probe seat and respectively extend out of the two strip-shaped holes on the fixed seat. One end of the rotating shaft extending out of the strip-shaped hole is connected with the moving block located on one side of the fixed seat, and the other end of the rotating shaft extending out of the strip-shaped hole is connected with the limit block located on the other side of the fixed seat. The moving block and the limit block control the movement of the probe seat in the fixed seat. The tandem probe is arranged on the upper surface of the probe seat through the probe fixing frame. A wear-resistant block is arranged on one side of the lower end of the fixed seat, and the wear-resistant block is arranged in contact with the outer wall of the steel pipe.
[0019] Technical effect: The tandem probe mounting seat adopted by the present utility model is equivalent to a swing mechanism. The fixed seat is hinged and can move. The fixed seat moves in the swing frame according to the adjustment to fit the outer wall of the steel pipe, so that the probe can swing on the xy axis to adapt to the unevenness and ovality of the steel pipe, with better adaptability. And two probes are arranged in the fixed seat. Multiple probes can make the flaw detection more accurate. At the same time, the probe seat can move in the fixed seat. On the basis that the tandem probe mounting seat can move, the probe seat can move again in the fixed seat to adapt to steel pipes with different diameters, improve the adaptability, and further fix to ensure the stability of the probe through the limit block after the probe seat moves.
[0020] In the tandem mechanism applied to steel pipe weld flaw detection described above, the side of the wear-resistant block in contact with the steel pipe is an arc structure adapted to the steel pipe.
[0021] Technical effect: The side of the wear-resistant block of the present utility model in contact with the steel pipe is an arc, which is convenient for the whole tandem probe mounting seat to fit the outer wall of the steel pipe and is convenient for accurate flaw detection of the weld.
[0022] In the above-mentioned tandem mechanism applied to steel pipe weld flaw detection, several limiting holes are provided on the limiting block. The limiting holes are arc-shaped holes, and the several limiting holes are arranged in an arc on the limiting block.
[0023] Technical effect: The setting of the limiting block can ensure the movement of the probe holder within the fixed seat. The limiting block is provided with limiting holes, and the limiting holes themselves are of an arc-shaped hole structure, and the positions where the limiting holes are arranged on the limiting block are in an arc shape. This facilitates rotating the limiting block to adjust the angle of the limiting hole to match the angle of the rotated probe holder, and then cooperating with the limiting post to position the probe holder. The double-arc setting maximally matches the rotation angle of the probe holder, better centers on the weld, and improves the accuracy of flaw detection.
[0024] In the above-mentioned tandem mechanism applied to steel pipe weld flaw detection, a limiting post is further provided on one side of the probe holder where the limiting block is connected. The limiting post is located at the upper end of one side of the probe holder, such that the limiting post is located above the fixed seat. One end of the limiting post is connected to the probe holder, and the other end is arranged in the limiting hole of the limiting block for fixing and limiting after the probe holder rotates.
[0025] Technical effect: The limiting post can be arranged in the limiting hole, and after the probe holder rotates, the limiting post is fixed through the limiting hole on the limiting block. This can not only adjust the distance between the probes but also separately adjust the rotation angle of the probes, greatly improving the adjustability of the probes, enabling them to better center on the weld and accurately measure.
[0026] The beneficial effects of the present utility model are:
[0027] The weld centering mechanism of the present utility model makes the rollers on the inner bracket closely adhere to the outer surface of the steel pipe through the pressure of the robot arm in the flaw detection device. The spring and pin shaft on the inner bracket are connected to the outer bracket, and the inner bracket can swing left and right, better adapting to the ovality and unevenness of the steel pipe, reducing the influence of ovality and unevenness on ultrasonic flaw detection, and enabling more accurate flaw detection of the weld on the outer wall of the steel pipe.
[0028] The present utility model can quickly realize the adjustment of weld centering of the tandem mechanism through the adjustment mechanism, thereby performing detection and flaw detection work on steel pipes with different diameters having ovality and unevenness;
[0029] The present utility model can adjust the distance between two groups of probes by setting the tandem probe mounting seat in combination with the adjustment mechanism, and can also adjust the distance between the two tandem probes in the tandem probe mounting seat, as well as the rotation angle of the probes, to adapt to steel pipes with different diameters, with good adjustability and strong adaptability. Description of the Drawings
[0030] Figure 1 It is a schematic structural diagram of the tandem mechanism applied to steel pipe weld flaw detection according to an embodiment of the present utility model;
[0031] Figure 2 is Figure 1 a structural schematic diagram of the weld alignment mechanism in
[0032] Figure 3 is Figure 2 a sectional view of
[0033] Figure 4 is Figure 1 a structural schematic diagram of the left adjustment mechanism in
[0034] Figure 5 is Figure 1 a structural schematic diagram of the right adjustment mechanism in
[0035] Figure 6 is Figure 1 a structural schematic diagram of the tandem probe mounting base in
[0036] Figure 7 is Figure 6 a structural schematic diagram of the tandem probe mounting base disposed on the steel pipe in
[0037] Figure 8 a partially enlarged schematic diagram of the probe base;
[0038] Figure 9 is
[0039] In the figure: 1 - weld alignment mechanism, 101 - outer bracket, 102 - inner bracket, 103 - roller, 2 - left adjustment mechanism, 201 - left adjustment guide rail, 202 - rotating rod seat, 203 - left slider, 204 - left adjustment handwheel, 3 - right adjustment mechanism, 301 - right adjustment guide rail, 302 - right slider, 303 - right adjustment handwheel, 5 - tandem probe mounting base, 501 - fixed seat, 502 - probe base, 503 - probe fixing bracket, 504 - tandem probe, 505 - limit block, 506 - moving block, 507 - swing bracket, 508 - wear-resistant block, 509 - limit hole, 5010 - limit post, 6 - steel pipe, 7 - compression spring, 8 - connecting block. Specific embodiments
[0040] To make the present invention more clearly understood, the following further describes a device for steel pipe flaw detection according to the present invention with reference to the accompanying drawings. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Embodiment 1
[0041] A tandem mechanism applied to steel pipe weld flaw detection provided in this embodiment has a structure as shown in Figure 1As shown in the figure, it includes a weld alignment mechanism 1, an adjustment mechanism, and a tandem probe mounting base 5 that cooperate with each other. The weld alignment mechanism 1 is located at the upper end of the steel pipe 6. The weld alignment mechanism 1 is movably arranged along the length direction of the weld of the steel pipe 6. The adjustment mechanism includes a left adjustment mechanism 2 and a right adjustment mechanism 3 arranged left and right. The left adjustment mechanism 2 and the right adjustment mechanism 3 are respectively arranged on both sides of the weld alignment mechanism 1. The ends of the left adjustment mechanism 2 and the right adjustment mechanism 3 are respectively connected with a tandem probe mounting base 5. The tandem probe mounting base 5 is arranged in contact with the outer wall of the steel pipe 6. After the weld alignment mechanism 1 aligns the weld, the left adjustment mechanism 2 and the right adjustment mechanism 3 drive the corresponding tandem probe mounting bases 5 to move and adjust on the outer wall of the steel pipe 6;
[0042] The structure is as Figure 2 and 3 As shown in the figure, the weld alignment mechanism 1 includes an outer bracket 101 and an inner bracket 102. An inner bracket 102 is arranged inside the outer bracket 101. Four corners at the bottom end of the inner bracket 102 are respectively provided with a roller 103 through a roller bracket. The weld alignment mechanism 1 is movably arranged along the length direction of the weld on the outer wall of the steel pipe 6 through the rollers 103 at the lower end of the inner bracket 102. Both the outer bracket 101 and the inner bracket 102 include a cross plate and side plates arranged on both sides of the cross plate. The side plates on the outer bracket 101 are of an inverted triangular structure, which is convenient for avoiding the rollers installed on the side plates of the square structure above the inner bracket 102, making the rollers more convenient for installation, disassembly, and rolling. Four corners at the upper ends of the two side plates in the inner bracket 102 are respectively connected with the cross plate in the outer bracket 101 through springs. The lower ends of the two side plates in the inner bracket 102 are respectively movably connected with the corresponding inverted triangular side plates in the outer bracket 101 through pins. The left adjustment mechanism 2 and the right adjustment mechanism 3 are respectively arranged on one side plate in the inner bracket 102. The left adjustment mechanism 2 and the right adjustment mechanism 3 are symmetrically distributed along the center line of the side plate;
[0043] The structure is as Figure 4 As shown in the figure, the left adjustment mechanism 2 includes a left adjustment guide rail 201, a rotating rod seat 202, a left slider 203, and a left adjustment handwheel 204. The rotating rod seat 202 and the right adjustment mechanism 3 are on the same side of the weld alignment mechanism 1. The rotating rod seat 202 is connected with the left adjustment guide rail 201 through a universal joint. A left adjustment handwheel 204 for adjustment is arranged on the side of the rotating rod seat 202 away from the left adjustment guide rail 201. A left slider 203 is arranged on the left adjustment guide rail 201;
[0044] The structure is as Figure 5 As shown in the figure, the right adjustment mechanism 3 includes a right adjustment guide rail 301, a right slider 302, and a right adjustment handwheel 303. A right adjustment handwheel 303 for adjustment is arranged at one end of the right adjustment guide rail 301 away from the left adjustment guide rail 201. The right slider 302 is arranged on the right adjustment guide rail 301;
[0045] The lower ends of the left slider 203 and the right slider 302 are respectively connected with a connecting block 8 through a compression spring 7, and the lower end of the connecting block 8 is movably connected with a tandem probe mounting seat 5 through a pin shaft;
[0046] By adjusting the left adjusting handwheel 204 and the right adjusting handwheel 303, the two tandem probe mounting seats 5 are made to closely adhere to the outer wall of the steel pipe 6 to adapt to steel pipes of different diameters. Specifically: First, through the adjusting mechanism, the tandem probe mounting seats 5 on both the left and right sides are brought close to the outer wall of the steel pipe, and then through the up-and-down adjustment of the sliders and the cooperation with the swing of the tandem probe mounting seat 5, the probe seat is made to closely adhere to the outer wall of the steel pipe;
[0047] The structure is as Figure 6-7 shown. The tandem probe mounting seat 5 includes a fixed seat 501, a probe seat 502, a probe fixing frame 503, a tandem probe 504, a limit block 505, a moving block 506, a swing frame 507 and a wear-resistant block 508. One side of the swing frame 507 is movably connected with the adjusting mechanism through a pin shaft. The other side of the swing frame 507 is concave to form a groove, and the fixed seat 501 is hinged in the groove. Strip-shaped holes are respectively opened on both sides of the fixed seat 501 along its length direction. Two probe seats 502 are movably arranged in the fixed seat 501. A rotating shaft is inserted through each probe seat 502, and the probe seat rotates on the rotating shaft. The rotating shaft penetrates both ends of the probe seat and respectively extends out of the two strip-shaped holes on the fixed seat. One end of the rotating shaft extending out of the strip-shaped hole is connected with the moving block 506 located on one side of the fixed seat, and the other end of the rotating shaft extending out of the strip-shaped hole is connected with the limit block located on the other side of the fixed seat. The moving block 506 and the limit block control the movement of the probe seat 502 in the fixed seat 501. The tandem probe 504 is arranged on the upper surface of the probe seat 502 through the probe fixing frame 503. One side of the lower end of the fixed seat 501 is provided with a wear-resistant block 508, and the wear-resistant block 508 is arranged in a manner that it fits the outer wall of the steel pipe 6. The side of the wear-resistant block 508 that fits the steel pipe 6 is an arc-shaped structure adapted to the steel pipe 6;
[0048] The structure is as Figure 8 shown. Two limit holes 509 are arranged on the limit block 505. The limit holes 509 are arc-shaped holes, and the positions of the two limit holes 509 on the limit block 505 are arranged in an arc shape. The limit block 505 can be rotated to adjust a suitable limit hole to cooperate with the limit post, so that the probe seat is fixed at a suitable rotation angle; A limit post 5010 is also arranged on one side of the probe seat 502 connected with the limit block 505. The limit post 5010 is located at the upper end of one side of the probe seat 502, so that the limit post 5010 is located above the fixed seat 501. One end of the limit post 5010 is connected to the probe seat 502, and the other end is arranged in the limit hole 509 of the limit block 505 to perform fixed limit after the probe seat 502 rotates.
[0049] During specific implementation:
[0050] (1)The rollers in the weld alignment mechanism are closely attached to the surface of the steel pipe, and the ovality of steel pipes with different diameters is adapted through the adjustment of four tension springs;
[0051] (2)The left adjustment mechanism and the rotating rod seat are connected by a universal joint. The left adjustment handwheel on the rotating rod seat adjusts the left slider on the left adjustment mechanism through a lead screw to adjust the position of the tandem probe mounting seat. Similarly, the right adjustment mechanism adjusts the right slider through the right adjustment handwheel to adjust the position of the tandem probe mounting seat;
[0052] (3)Two ultrasonic probes are arranged in each tandem probe mounting seat. The probes are fixed in the corresponding positions through a fixed probe holder, and the distance between the two groups of probes and the ovality of the steel pipe can be adapted through a moving block.
[0053] (4)As Figure 9 shown, 2 pairs are formed by four groups of tandem probes, which are placed on both sides of the weld to detect the welding defects in the center part of the weld on their respective sides. The four groups of probes can form a coupling monitoring to ensure the validity of the data.
[0054] Except for the above embodiments, the present utility model can also have other implementation manners. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present utility model.
Claims
1. A serial mechanism used for flaw detection of steel pipe welds, characterized in that: The invention comprises a weld centering mechanism (1), an adjustment mechanism and a serial probe mounting seat (5), wherein the weld centering mechanism (1) is located at the upper end of the steel pipe (6), and the weld centering mechanism (1) is arranged along the length direction of the weld of the steel pipe (6). The adjustment mechanism comprises a left adjustment mechanism (2) and a right adjustment mechanism (3) arranged on the left and right sides, and the left adjustment mechanism (2) and the right adjustment mechanism (3) are respectively arranged on both sides of the weld centering mechanism (1). The ends of the left adjustment mechanism (2) and the right adjustment mechanism (3) are respectively connected to the serial probe mounting seat (5), and the serial probe mounting seat (5) is arranged to fit the outer wall of the steel pipe (6). After the weld centering mechanism (1) centers the weld, the left adjustment mechanism (2) and the right adjustment mechanism (3) drive the corresponding serial probe mounting seat (5) to move and adjust on the outer wall of the steel pipe (6); The weld centering mechanism (1) comprises an outer bracket (101) and an inner bracket (102); the inner bracket (102) is arranged inside the outer bracket (101); four corners of the bottom end of the inner bracket (102) are respectively provided with a roller (103) via a roller frame; the weld centering mechanism (1) is movably arranged on the outer wall of the steel pipe (6) via the roller (103) at the lower end of the inner bracket (102); four corners of the upper end of the inner bracket (102) are respectively connected to the outer bracket (101) via springs; one side of the lower end of the inner bracket (102) is movably connected to the outer bracket (101) via a pin shaft; and the left adjustment mechanism (2) and the right adjustment mechanism (3) are arranged inside the inner bracket (102) on the left and right sides.
2. The tandem mechanism for steel pipe weld flaw detection according to claim 1 is characterized in that: The left adjustment mechanism (2) comprises a left adjustment rail (201), a rotating rod seat (202), a left slider (203) and a left adjustment hand wheel (204); the rotating rod seat (202) is connected to the left adjustment rail (201) via a universal joint; a left adjustment hand wheel (204) for adjustment is provided on a side of the rotating rod seat (202) away from the left adjustment rail (201); the left slider (203) is provided on the left adjustment rail (201); and the serial probe mounting seat (5) is provided at an end of the left slider (203); The right adjustment mechanism (3) comprises a right adjustment rail (301), a right slider (302) and a right adjustment hand wheel (303); an end of the right adjustment rail (301) away from the left adjustment rail (201) is provided with the right adjustment hand wheel (303) for adjustment; the right slider (302) is arranged on the right adjustment rail (301); and the end of the right slider (302) is provided with the serial probe mounting seat (5); By adjusting the left adjusting hand wheel (204) and the right adjusting hand wheel (303), the two serial probe mounting seats (5) can be closely attached to the outer wall of the steel pipe (6), thereby adapting to steel pipes (6) with different pipe diameters.
3. The tandem mechanism for steel pipe weld flaw detection according to claim 2 is characterized in that: The rotating rod seat (202) and the right adjustment mechanism (3) are located on the same side of the weld centering mechanism (1).
4. The tandem mechanism for steel pipe weld flaw detection according to claim 2 is characterized in that: The lower ends of the left slider (203) and the right slider (302) are respectively connected to a connecting block (8) via a compression spring (7), and the lower end of the connecting block (8) is movably connected to the serial probe mounting seat (5) via a pin shaft.
5. The serial mechanism for flaw detection of steel pipe welds according to claim 1 is characterized in that: The serial probe mounting seat (5) comprises a fixed seat (501), a probe seat (502), a probe fixing frame (503), a serial probe (504), a limit block (505), a moving block (506), a swing frame (507) and a wear-resistant block (508); one side of the swing frame (507) is movably connected to the adjustment mechanism via a pin shaft; the other side of the swing frame (507) is concave to form a groove; the fixed seat (501) is hinged in the groove; strip holes are respectively opened on both sides of the fixed seat (501) along the length direction thereof; two probe seats (502) are arranged in the fixed seat (501); a rotating shaft is inserted in each probe seat (502); The probe seat rotates on the rotating shaft, and the rotating shaft penetrates the two ends of the probe seat and extends out of the two strip holes on the fixed seat respectively. One end of the rotating shaft extending out of the strip hole is connected to a moving block (506) located on one side of the fixed seat, and the other end of the rotating shaft extending out of the strip hole is connected to a limit block located on the other side of the fixed seat. The moving block (506) and the limit block control the movement of the probe seat (502) in the fixed seat (501). The upper surface of the probe seat (502) is provided with the serial probe (504) through the probe fixing frame (503), and the wear-resistant block (508) is provided on one side of the lower end of the fixed seat (501). The wear-resistant block (508) is arranged to fit the outer wall of the steel pipe (6).
6. The serial mechanism for flaw detection of steel pipe welds according to claim 5 is characterized in that: The side of the wear-resistant block (508) that is in contact with the steel pipe (6) is an arc-shaped structure that is compatible with the steel pipe (6).
7. The tandem mechanism for steel pipe weld flaw detection according to claim 5, characterized in that: The limiting block (505) is provided with a plurality of limiting holes (509), wherein the limiting holes are arc-shaped holes, and the plurality of limiting holes (509) are arranged in an arc shape on the limiting block (505).
8. The serial mechanism for steel pipe weld flaw detection according to claim 6 is characterized in that: A limiting column (5010) is also provided on one side of the probe seat (502) connected to the limiting block (505); the limiting column (5010) is located at the upper end of one side of the probe seat (502), so that the limiting column (5010) is located above the fixing seat (501); one end of the limiting column (5010) is connected to the probe seat (502), and the other end is arranged in a limiting hole (509) of the limiting block (505), so as to perform fixed limiting after the probe seat (502) is rotated.