Nondestructive testing device and method for circumferential weld of metal pipeline

Abstract

The invention relates to the field of weld joint detection, discloses a nondestructive testing device and method for a circumferential weld joint of a metal pipeline, and solves the problem that the distance between the weld joint and an ultrasonic probe needs to be adjusted in time and is troublesome when the diameter of the metal pipeline changes at present. A rotating detection assembly is arranged between the two supporting ring frames, clamping and fixing assemblies are arranged on the supporting ring frames, the clamping and fixing assemblies are used for centering and fixing a metal pipeline, relative moving parts are arranged between the base and the supporting ring frames, and the rotating detection assembly comprises a rotating ring frame arranged between the two supporting ring frames; an ultrasonic probe used for weld joint detection is arranged on the inner side of the rotating ring frame, rotating ring plates are symmetrically arranged on the two sides of the rotating ring frame, the rotating ring frame is driven to rotate through rotation of the rotating ring plates, the rotating ring frame is arranged on the outer side of a metal pipeline in a sleeving mode, and the ultrasonic probe can conveniently move along an annular weld joint for detection.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of weld detection, and particularly relates to a metal pipeline girth weld nondestructive detection device and method. BACKGROUND

[0002] When metal welds are nondestructively detected, an ultrasonic detection method is generally used for detection, according to a patent document with the authorized announcement number CN221883526U and the invention name of a metal pipeline nondestructive detection device, the specification of which is recorded as follows: a support frame is fixedly arranged at the top of the mounting seat, a gas cylinder is fixedly arranged at the top of the support frame, the output end of the gas cylinder penetrates through the support frame and is in sliding connection with the support frame, a connecting rod is fixedly arranged at the output end of the gas cylinder, a spring is arranged on the circumferential outer wall of the connecting rod, a fixed plate is in sliding connection with the circumferential outer wall of the connecting rod, two support rods are fixedly arranged at the bottom of the fixed plate in a symmetrical structure, a limiting sleeve is fixedly arranged at the bottom outer wall of the connecting rod, a threaded rod is in threaded connection with the bottom of the connecting rod, an ultrasonic probe is fixedly arranged at the bottom of the threaded rod, a knob is fixedly arranged on the circumferential outer wall of the threaded rod, the knob can drive the threaded rod to rotate, so that the threaded rod is moved out of the connecting rod, the ultrasonic probe is disassembled, and the replacement and maintenance of the ultrasonic probe are facilitated, one end of the spring is in fixed connection with the support frame, the other end of the spring is in fixed connection with the fixed plate, two hinge seats are fixedly arranged at the bottom of the two support rods, and two rollers are in rotary connection with the inner walls of the two hinge seats. Due to the different diameters of metal pipelines, when different diameter metal pipelines are detected, the distance between the ultrasonic probe and the outer wall of the metal pipeline needs to be adjusted, so that the distance between the weld and the ultrasonic probe is within an appropriate range, and the adjustment needs to control the distance, which is relatively troublesome and reduces the detection efficiency. SUMMARY

[0003] In view of the above problems, the metal pipeline girth weld nondestructive detection device and method can effectively solve the problem that the distance between the weld and the ultrasonic probe needs to be adjusted in time when the diameter of the metal pipeline changes.

[0004] To achieve the above purpose, the application provides the following technical scheme: a metal pipeline girth weld nondestructive detection device, comprising a base, two support ring frames are symmetrically arranged above the base, a rotating detection assembly is arranged between the two support ring frames, a clamping and fixing assembly is arranged on the support ring frame, the clamping and fixing assembly is used for centering and fixing the metal pipeline, and a relative moving piece is arranged between the base and the support ring frame. The rotation detection assembly comprises a rotating ring frame arranged between the two support ring frames, an ultrasonic probe for weld joint detection is arranged on the inner side of the rotating ring frame, two rotating ring plates are symmetrically arranged on the two sides of the rotating ring frame, the two rotating ring plates are respectively located on the side of the two support ring frames close to each other, a distance adjusting piece is arranged between the rotating ring plate and the ultrasonic probe, guide cross bars are equiangularly arranged on the inner side of the rotating ring plate, guide fixed plates are equiangularly arranged on the two sides of the rotating ring frame, and the guide fixed plates are slidably connected with the guide cross bars. The clamping and fixing assembly comprises an extrusion ring arranged on the inner side of the rotating ring plate, the extrusion ring is located on the side of the guide cross bar away from the rotating ring frame, and the extrusion ring is fixedly connected with the end portions of the guide fixed plates, the side of the two support ring frames away from each other is equiangularly provided with a centering and clamping piece, and the rotating drive piece for driving the ultrasonic probe to move along the circular weld joint for detection is arranged between the support ring frame and the rotating ring plate.

[0005] Preferably, the centering and clamping piece comprises a fixed box equiangularly arranged on the side of the support ring frame away from the rotating ring frame, a limiting plate is slidably arranged in the fixed box, a vertical tooth plate is arranged at the bottom end of the limiting plate, the bottom end of the vertical tooth plate penetrates to the side of the fixed box close to the central axis of the support ring frame, a clamping head is arranged at the end portion of the vertical tooth plate, and an internal gear is engagedly connected on one side of the vertical tooth plate and rotatably arranged in the fixed box.

[0006] Preferably, two horizontal tooth plates are engagedly connected above the internal gear, the horizontal tooth plates are slidably arranged in guide sliding grooves, the guide sliding grooves are symmetrically arranged on the fixed box, a pressure receiving block is arranged between the ends of the two horizontal tooth plates close to the rotating ring frame, the pressure receiving block is in contact with the side of the extrusion ring away from the rotating ring frame, a reset spring is symmetrically arranged on the side of the pressure receiving block close to the fixed box, and one end of the reset spring is fixedly connected with the fixed box.

[0007] Preferably, the rotating drive piece comprises a limiting rotating ring fixedly arranged on the side of the rotating ring plate close to the support ring frame, the limiting rotating ring is rotatable in a limiting ring groove, the limiting ring groove is arranged in the inner portion of the support ring frame, a tooth ring is fixedly arranged on the outer side of the rotating ring plate, a driving gear is engagedly connected below the tooth ring, the driving gear is fixedly connected with the output shaft of the first motor, and the two first motors are connected in series.

[0008] Preferably, the distance adjusting piece comprises a fixed cylinder fixedly arranged on the outer wall of the rotating ring frame, the fixed cylinder is in communication with the inner cavity of the rotating ring frame, the position of the fixed cylinder corresponds to the position of the ultrasonic probe, an installation column is movably arranged in the inner portion of the fixed cylinder, the bottom end of the installation column is fixedly connected with the ultrasonic probe, side sliding grooves are symmetrically arranged on the two sides of the fixed cylinder, and side sliding blocks are symmetrically arranged on the two sides of the end of the installation column away from the ultrasonic probe.

[0009] Preferably, the side sliding block is in sliding connection with the side sliding groove, a connecting rod is hingedly installed on the side of the side sliding block away from the mounting column, the other end of the connecting rod is hingedly connected with the rotating ring plate, and the end of the connecting rod close to the fixing cylinder is obliquely arranged towards the side of the rotating ring frame.

[0010] Preferably, the relative moving part comprises sliding seats fixedly installed at the bottom end of the support ring frame, both sliding seats are slidingly installed in the sliding groove, the sliding groove is arranged in the inside of the base, a double-head screw rod is rotatably installed in the inside of the sliding groove, both sliding seats are in threaded connection with two opposite threaded grooves of the double-head screw rod, one end of the double-head screw rod is fixedly connected with the output shaft of the second motor, the second motor is fixedly installed on the base, both first motors are installed on both sliding seats, and a rotating speed adjusting assembly is arranged between both sliding seats.

[0011] Preferably, the rotating speed adjusting assembly comprises a front box fixedly installed on the front face of the base, the front box is in communication with the sliding groove, electric resistance rods are fixedly installed between the end walls of the front box, both sliding seats are provided with moving plates, the moving plates are located on the inside of the front box, rod grooves are arranged in the moving plates, and the electric resistance rods are located in the inside of the rod grooves.

[0012] Preferably, electrically conductive sliding strips are fixedly installed on the inside walls of the side of the front box away from the sliding groove, electrically conductive rods are installed on the end portions of the moving plates, the two ends of the electrically conductive rods are in contact with the electric resistance rods and the electrically conductive sliding strips respectively, two terminal posts are symmetrically installed on the front box, the terminal posts are in electrical connection with the electrically conductive sliding strips through wires, and two first motors, a storage battery and a switch are connected in series between the two terminal posts.

[0013] The application also provides a detection method of the metal pipeline girth weld nondestructive detection device. S1, metal pipeline installation: inserting the metal pipeline into the inside of the two support ring frames and the rotating ring frame, making the weld on the metal pipeline correspond to the position of the rotating ring frame, starting the second motor to drive the two support ring frames to move close to each other, generating pressure on the pressure block, pushing the vertical toothed plate to move towards the metal pipeline, and making each clamping head clamp, center and fix the metal pipeline; S2, probe device adjustment: moving the mounting column towards the metal pipeline through the connecting rod, thereby adjusting the distance between the ultrasonic probe and the girth weld; S3, rotating speed adjustment: moving the electrically conductive rods to adjust the resistance value of the resistance rods connected to the circuit, thereby adjusting the rotating speed of the driving gear when the first motor is started; S4, rotating detection: opening the circuit switch, starting the two first motors at the same time, making the driving gear rotate to drive the rotating ring frame to rotate, and making the ultrasonic probe move along the girth weld to detect.

[0014] Compared with the prior art, the present application has the following beneficial effects: (1) According to the present application, the extrusion ring generates pressure on the pressure block during the movement of the two support ring frames towards the rotating ring frame, and the clamping head is driven to move towards the metal pipeline through the transverse toothed plate, the internal gear and the vertical toothed plate, so that each clamping head clamps and fixes the metal pipeline, facilitating the relative rotation of the rotating ring frame and the metal pipeline, and facilitating the weld detection; (2) According to the present application, the rotating ring frame is arranged between the two support ring frames, and after the two support ring frames are clamped, the mounting column is pushed to move towards the metal pipeline through the connecting rod, so that the smaller the diameter of the metal pipeline, the smaller the distance between the two support ring frames, and then the greater the moving distance of the ultrasonic probe towards the metal pipeline, so that when the diameter of the metal pipeline is different, the distance between the ultrasonic probe and the weld is within the detection suitable distance range, and the position of the ultrasonic probe is self-adaptively adjusted according to the diameter of the metal pipeline, facilitating the detection; (3) According to the present application, the length of the resistance rod is proportional to the resistance of the resistance rod, and the two support ring frames drive the two conductive rods to move, and when the diameter of the metal pipeline is greater, the resistance value of the external circuit of the first motor is greater, and the rotating speed of the driving gear is smaller, so that the rotating speed of the rotating ring frame is slower, and when the diameter of the metal pipeline changes, the linear speed of the ultrasonic probe moving along the circular weld is kept stable, facilitating the detection. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the present application, and do not constitute a limitation on the present application.

[0016] In the drawings: Figure 1 It is a structure schematic view of the metal pipeline circular weld nondestructive detection device of the present application; Figure 2 It is a structure schematic view of the relative moving part of the present application; Figure 3 It is a structure schematic view of the rotating detection assembly of the present application; Figure 4 It is a structure schematic view of the rotating ring frame of the present application; Figure 5 It is a structure schematic view of the rotating driving part of the present application; Figure 6 It is a structure schematic view of the centering and clamping part of the present application; Figure 7 It is a structure schematic view of the rotating speed adjusting assembly of the present application; Figure 8 It is a circuit diagram of the present application; In the figure: 1, base; 2, support ring frame; 3, rotation detection assembly; 301, rotating ring frame; 302, rotating ring plate; 303, guide cross bar; 304, guide fixed plate; 305, fixed cylinder; 306, side sliding groove; 307, mounting column; 308, ultrasonic probe; 309, side sliding block; 310, connecting rod; 4, clamping and fixing assembly; 401, extrusion ring; 402, limiting ring groove; 403, limiting rotating ring; 404, gear ring; 405, driving gear; 406, first motor; 407, centering and clamping part; 4071, fixed box; 4072, limiting plate; 4073, vertical toothed plate; 4074, clamping head; 4075, internal gear; 4076, guide sliding groove; 4077, transverse toothed plate; 4078, pressure receiving block; 4079, return spring; 5, sliding groove; 6, sliding seat; 7, double-headed screw rod; 8, second motor; 9, rotation speed adjusting assembly; 901, front box; 902, resistance rod; 903, moving plate; 904, rod groove; 905, conductive rod; 906, conductive sliding strip; 907, terminal post. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only 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 without creative work fall within the protection scope of the present application.

[0018] By Figures 1-8 The present application comprises a base 1, two support ring frames 2 are symmetrically arranged above the base 1, a rotation detection assembly 3 is arranged between the two support ring frames 2, a clamping and fixing assembly 4 is arranged on the support ring frame 2, the clamping and fixing assembly 4 is used for centering and fixing the metal pipeline, and a relative moving part is arranged between the base 1 and the support ring frame 2.

[0019] The rotation detection assembly 3 comprises a rotating ring frame 301 arranged between the two support ring frames 2, an ultrasonic probe 308 for weld detection is arranged on the inner side of the rotating ring frame 301, two rotating ring plates 302 are symmetrically arranged on the two sides of the rotating ring frame 301, the two rotating ring plates 302 are respectively located on the side where the two support ring frames 2 are close to each other, a distance adjusting part is arranged between the rotating ring plate 302 and the ultrasonic probe 308, guide cross bars 303 are equally installed on the inner side of the rotating ring plate 302, guide fixed plates 304 are equally installed on the two sides of the rotating ring frame 301, and the guide fixed plates 304 are slidingly connected with the guide cross bars 303.

[0020] The distance adjusting piece comprises a fixed cylinder 305 fixedly installed on the outer wall of the rotating ring frame 301, the fixed cylinder 305 is communicated with the inner cavity of the rotating ring frame 301, the position of the fixed cylinder 305 corresponds to the position of the ultrasonic probe 308, the inside of the fixed cylinder 305 movably installs an installation column 307, the bottom end of the installation column 307 is fixedly connected with the ultrasonic probe 308, the both sides of the fixed cylinder 305 symmetrically open side sliding grooves 306, the both sides of the end of the installation column 307 away from the ultrasonic probe 308 symmetrically install side sliding blocks 309, the side sliding blocks 309 are slidably connected with the side sliding grooves 306, the side of the side sliding blocks 309 away from the installation column 307 is hingedly installed with a connecting rod 310, the other end of the connecting rod 310 is hingedly connected with the rotating ring plate 302, the end of the connecting rod 310 close to the fixed cylinder 305 is obliquely arranged towards one side of the rotating ring frame 301, the rotating ring frame 301 is arranged between the two support ring frames 2, after the two support ring frames 2 are clamped to each other, the installation column 307 is pushed to move towards the metal pipeline through the connecting rod 310, so that the smaller the diameter of the metal pipeline is, the smaller the distance between the two support ring frames 2 is, and then the distance of the ultrasonic probe 308 moving towards the metal pipeline is larger, so that when the diameter of the metal pipeline is different, the distance between the ultrasonic probe 308 and the weld is within the detection appropriate distance range, the position of the ultrasonic probe 308 is self-adaptively adjusted with the diameter of the metal pipeline, and the detection is facilitated.

[0021] The clamping and fixing assembly 4 comprises an extrusion ring 401 arranged on the inner side of the rotating ring plate 302, the extrusion ring 401 is located on the side of the guide cross bar 303 away from the rotating ring support 301, and the extrusion ring 401 is fixedly connected with the end of each guide fixed plate 304, the two support ring supports 2 are symmetrically provided with centering clamping pieces 407 at equal angles on the sides away from each other, and the support ring support 2 and the rotating ring plate 302 are provided with a rotating driving piece for driving the ultrasonic probe 308 to move along the circular weld for detection, the centering clamping piece 407 comprises a fixed box 4071 installed at equal angles on the side of the support ring support 2 away from the rotating ring support 301, a limiting plate 4072 is slidably installed in the fixed box 4071, a vertical tooth plate 4073 is installed at the bottom end of the limiting plate 4072, the bottom end of the vertical tooth plate 4073 penetrates to the side of the fixed box 4071 close to the central axis of the support ring support 2, a clamping head 4074 is installed at the end of the vertical tooth plate 4073, an internal gear 4075 is engagedly connected on one side of the vertical tooth plate 4073, the internal gear 4075 is rotatably installed in the fixed box 4071, two horizontal tooth plates 4077 are engagedly connected above the internal gear 4075, the horizontal tooth plates 4077 are slidably installed in guide sliding grooves 4076, the guide sliding grooves 4076 are symmetrically arranged on the fixed box 4071, a pressure receiving block 4078 is installed between the two horizontal tooth plates 4077 close to the rotating ring support 301, the pressure receiving block 4078 is in contact with the side of the extrusion ring 401 away from the rotating ring support 301, a return spring 4079 is symmetrically installed on the side of the pressure receiving block 4078 close to the fixed box 4071, one end of the return spring 4079 is fixedly connected with the fixed box 4071, during the movement of the two support ring supports 2 towards the rotating ring support 301, the extrusion ring 401 generates pressure on the pressure receiving block 4078, the clamping head 4074 is driven to move towards the metal pipeline through the horizontal tooth plate 4077, the internal gear 4075 and the vertical tooth plate 4073, so that each clamping head 4074 clamps and fixes the metal pipeline in the center, facilitating the relative rotation of the rotating ring support 301 and the metal pipeline, and facilitating the weld detection.

[0022] The rotating driving piece comprises a limiting rotating ring 403 fixedly installed on the side of the rotating ring plate 302 close to the support ring support 2, the limiting rotating ring 403 rotates in the limiting ring groove 402, the limiting ring groove 402 is arranged in the inner side of the support ring support 2, a gear ring 404 is fixedly installed on the outer side of the rotating ring plate 302, a driving gear 405 is engagedly connected below the gear ring 404, the driving gear 405 is fixedly connected with the output shaft of the first motor 406, the two first motors 406 are connected in series, after the first motor 406 is turned on, the driving gear 405 is driven to rotate, the two rotating ring plates 302 are driven to rotate, and then the rotating ring support 301 is driven to rotate, so that the ultrasonic probe 308 moves along the circular weld, and the circular weld is detected.

[0023] The relative moving part comprises sliding seats 6 fixedly installed at the bottom ends of the support ring frames 2, both of the sliding seats 6 are slidingly installed in the sliding grooves 5, the sliding grooves 5 are arranged in the base 1, double-head screws 7 are rotatably installed in the sliding grooves 5, both of the sliding seats 6 are threadedly connected with two opposite screw grooves of the double-head screws 7, one end of the double-head screw 7 is fixedly connected with the output shaft of the second motor 8, the second motor 8 is fixedly installed on the base 1, both of the first motors 406 are installed on the sliding seats 6, and the speed adjusting assembly 9 is arranged between the two sliding seats 6, the second motor 8 is started to drive the double-head screw 7 to rotate, since the sliding seats 6 at the bottom ends of the two support ring frames 2 are threadedly connected with the two opposite screw grooves of the double-head screw 7, the two support ring frames 2 are driven to synchronously move close to each other, and the metal pipeline is clamped and fixed in the center.

[0024] The speed adjusting assembly 9 comprises a front box 901 fixedly installed on the front of the base 1, the front box 901 is communicated with the sliding groove 5, resistance rods 902 are fixedly installed between the inner walls of the two ends of the front box 901, moving plates 903 are installed on the two sliding seats 6, the moving plates 903 are located on the inner side of the front box 901, rod grooves 904 are arranged in the moving plates 903, the resistance rods 902 are located in the rod grooves 904, conductive sliding strips 906 are fixedly installed on the inner walls of the two ends of the front box 901 away from the sliding groove 5, conductive rods 905 are installed on the ends of the moving plates 903, the two ends of the conductive rods 905 are respectively in contact with the resistance rods 902 and the conductive sliding strips 906, two terminal posts 907 are symmetrically installed on the front box 901, the terminal posts 907 are electrically connected with the conductive sliding strips 906 through wires, the two terminal posts 907 are connected with the two first motors 406, the battery and the switch in series, the length of the resistance rod 902 is proportional to the resistance of the resistance rod 902, the two support ring frames 2 drive the two conductive rods 905 to move, when the diameter of the metal pipeline is larger, the resistance of the external circuit of the first motor 406 is larger, the rotating speed of the driving gear 405 is smaller, the rotating speed of the rotating ring frame 301 is slower, the linear speed of the ultrasonic probe 308 moving along the circular weld is stable when the diameter of the metal pipeline changes, and the detection is facilitated.

[0025] A detection method of the metal pipeline circular weld nondestructive detection device is provided. In use, the metal pipeline is inserted into the inside of the two support ring frames 2 and the rotating ring frame 301, so that the position of the circular weld on the metal pipeline corresponds to the rotating ring frame 301, then the second motor 8 is started to drive the double-head screw 7 to rotate, since the sliding seats 6 at the bottom ends of the two support ring frames 2 are threadedly connected with the two opposite screw grooves of the double-head screw 7, the two support ring frames 2 are driven to synchronously move close to each other. In the process of moving the support ring frame 2 to the side of the rotating ring frame 301, the end of the connecting rod 310 close to the mounting column 307 is gradually tilted and rotated towards the rotating ring frame 301, thereby pushing the ultrasonic probe 308 to move towards the metal pipe, and the fixed box 4071 on the support ring frame 2 moves towards the pressing ring 401 at the end of the guide fixed plate 304, so that the pressure block 4078 is pressed and moves towards the fixed box 4071. Due to the engagement of the transverse tooth plate 4077 with the internal gear 4075, the internal gear 4075 rotates counterclockwise, and the internal gear 4075 engages with the vertical tooth plate 4073, thereby driving the vertical tooth plate 4073 to move towards the metal pipe, until the four clamping heads 4074 move synchronously to center and clamp the metal pipe, facilitating the coaxial arrangement of the rotating ring frame 301 and the metal pipe, facilitating the coaxial movement of the ultrasonic probe 308 along the annular weld for detection, improving the detection effect. At the same time, as the diameter of the metal pipe decreases, the moving distance of the two support ring frames 2 increases, so that the moving distance of the ultrasonic probe 308 towards the metal pipe increases, so that the distance between the ultrasonic probe 308 and the weld is within an appropriate range under different diameters of the metal pipe, so that the position of the ultrasonic probe 308 is self-adapted to the diameter of the metal pipe, facilitating detection; During detection, the circuit switch is turned on, so that the two first motors 406 are energized, so that the driving gear 405 rotates, and the driving gear 405 engages with the gear ring 404, thereby driving the two rotating ring plates 302 to rotate, and then driving the rotating ring frame 301 to rotate, so that the ultrasonic probe 308 moves along the annular weld for detection; When the two support ring frames 2 move relative to each other, the two moving plates 903 move relative to each other, and one end of the conductive rod 905 on the moving plate 903 contacts the resistance rod 902, so that the length of the resistance rod 902 inserted into the circuit is adjusted after the two moving plates 903 move. The length of the resistance rod 902 is proportional to the resistance of the resistance rod 902, so that the larger the diameter of the metal pipe, the greater the length of the resistance rod 902 inserted into the circuit and the resistance. The larger the diameter of the metal pipe, the slower the rotating speed of the rotating ring frame 301, so that the linear speed of the ultrasonic probe 308 moving along the annular weld remains stable when the diameter of the metal pipe changes, facilitating detection.

Claims

1. A non-destructive testing device for a metal pipe girth weld, comprising a base (1), characterized in that: Two support ring frames (2) are symmetrically arranged above the base (1), a rotation detection component (3) is arranged between the two support ring frames (2), a clamping and fixing component (4) is arranged on the support ring frames (2), and the clamping and fixing component (4) is used to center and fix the metal pipe, and a relatively movable part is arranged between the base (1) and the support ring frames (2); The rotation detection assembly (3) comprises a rotating ring frame (301) arranged between the two supporting ring frames (2), an ultrasonic probe (308) for weld detection is arranged on the inner side of the rotating ring frame (301), rotating ring plates (302) are symmetrically arranged on both sides of the rotating ring frame (301), the two rotating ring plates (302) are respectively located on the sides of the two supporting ring frames (2) close to each other, a distance adjustment member is provided between the rotating ring plate (302) and the ultrasonic probe (308), a guide cross bar (303) is installed at an equal angle on the inner side of the rotating ring plate (302), and a guide fixing plate (304) is installed at an equal angle on both sides of the rotating ring frame (301), and the guide fixing plate (304) is slidably connected to the guide cross bar (303); The clamping and fixing assembly (4) includes an extrusion ring (401) arranged on the inner side of the rotating ring plate (302), the extrusion ring (401) is located on the side of the guide crossbar (303) away from the rotating ring frame (301), and the extrusion ring (401) is fixedly connected to the end of each guide fixing plate (304), and a centering clamping member (407) is provided at an equal angle on the side of the two supporting ring frames (2) away from each other, and a rotating driving member for driving the ultrasonic probe (308) to move along the annular weld for detection is provided between the supporting ring frame (2) and the rotating ring plate (302).

2. The nondestructive testing device for metal pipe girth welds according to claim 1, characterized in that: The centering clamping member (407) comprises a fixed box (4071) mounted at an equal angle on a side of the support ring frame (2) away from the rotating ring frame (301); a limit plate (4072) is slidably mounted inside the fixed box (4071); a vertical tooth plate (4073) is mounted at the bottom end of the limit plate (4072); the bottom end of the vertical tooth plate (4073) extends to a side of the fixed box (4071) close to the central axis of the support ring frame (2); a clamping head (4074) is mounted at the end of the vertical tooth plate (4073); an internal gear (4075) is meshedly connected to one side of the vertical tooth plate (4073); and the internal gear (4075) is rotatably mounted inside the fixed box (4071).

3. The nondestructive testing device for metal pipe girth welds according to claim 2, characterized in that: Two transverse tooth plates (4077) are meshedly connected above the internal gear (4075). The transverse tooth plates (4077) are slidably mounted inside the guide chute (4076). The guide chute (4076) is symmetrically opened on the fixed box (4071). A pressure block (4078) is mounted between one end of the two transverse tooth plates (4077) close to the rotating ring frame (301). The pressure block (4078) contacts the side of the extrusion ring (401) away from the rotating ring frame (301). A return spring (4079) is symmetrically mounted on the side of the pressure block (4078) close to the fixed box (4071). One end of the return spring (4079) is fixedly connected to the fixed box (4071).

4. The nondestructive testing device for metal pipe girth welds according to claim 3, characterized in that: The rotating drive member comprises a limiting rotating ring (403) fixedly mounted on a side of the rotating ring plate (302) close to the supporting ring frame (2); the limiting rotating ring (403) rotates inside a limiting ring groove (402); the limiting ring groove (402) is provided inside the supporting ring frame (2); a gear ring (404) is fixedly mounted on the outer side of the rotating ring plate (302); a driving gear (405) is meshedly connected to the lower side of the gear ring (404); the driving gear (405) is fixedly connected to the output shaft of the first motor (406); and the two first motors (406) are arranged in series.

5. The nondestructive testing device for metal pipe girth welds according to claim 4, characterized in that: The distance adjustment member includes a fixed cylinder (305) fixedly mounted on the outer wall of the rotating ring frame (301), the fixed cylinder (305) is communicated with the inner cavity of the rotating ring frame (301), and the position of the fixed cylinder (305) corresponds to the position of the ultrasonic probe (308), a mounting column (307) is movably mounted inside the fixed cylinder (305), the bottom end of the mounting column (307) is fixedly connected to the ultrasonic probe (308), side sliding grooves (306) are symmetrically opened on both sides of the fixed cylinder (305), and side sliding blocks (309) are symmetrically mounted on both sides of one end of the mounting column (307) away from the ultrasonic probe (308).

6. The nondestructive testing device for metal pipe girth welds according to claim 5, characterized in that: The side slider (309) is slidably connected to the side slide groove (306), and a connecting rod (310) is hingedly installed on one side of the side slider (309) away from the mounting column (307). The other end of the connecting rod (310) is hingedly connected to the rotating ring plate (302), and the end of the connecting rod (310) close to the fixed cylinder (305) is tilted toward the side of the rotating ring frame (301).

7. The nondestructive testing device for metal pipe girth welds according to claim 6, characterized in that: The relatively movable member comprises a sliding seat (6) fixedly mounted on the bottom end of the support ring frame (2), the two sliding seats (6) are both slidably mounted inside the sliding groove (5), the sliding groove (5) is opened inside the base (1), a double-headed screw (7) is rotatably mounted inside the sliding groove (5), the two sliding seats (6) are respectively threadedly connected to two thread grooves opened in opposite directions on the double-headed screw (7), one end of the double-headed screw (7) is fixedly connected to the output shaft of the second motor (8), the second motor (8) is fixedly mounted on the base (1), the two first motors (406) are respectively mounted on the two sliding seats (6), and a speed regulating component (9) is provided between the two sliding seats (6).

8. The nondestructive testing device for metal pipe girth welds according to claim 7, characterized in that: The speed regulating assembly (9) includes a front box (901) fixedly mounted on the front of the base (1), the front box (901) being connected to the sliding groove (5), a resistance rod (902) being fixedly mounted between the inner walls at both ends of the front box (901), and a movable plate (903) being mounted on each of the two sliding seats (6), the movable plate (903) being located on the inner side of the front box (901), a rod groove (904) being formed on the movable plate (903), and the resistance rod (902) being located on the inner side of the rod groove (904).

9. The nondestructive testing device for metal pipe girth welds according to claim 8, characterized in that: A conductive slide bar (906) is fixedly mounted on the inner wall of the front box (901) away from the sliding groove (5), a conductive rod (905) is mounted on the end of the movable plate (903), and the two ends of the conductive rod (905) are in contact with the resistance rod (902) and the conductive slide bar (906), respectively. Two terminals (907) are symmetrically mounted on the front box (901), and the terminals (907) are electrically connected to the conductive slide bar (906) via a wire. Two first motors (406), a battery, and a switch are arranged in series between the two terminals (907).

10. The detection method of the nondestructive testing device for metal pipe girth weld according to claim 9, characterized in that: The detection method is as follows: S1. Installation of the metal pipe: insert the metal pipe into the two support ring frames (2) and the inner side of the rotating ring frame (301), so that the weld on the metal pipe corresponds to the position of the rotating ring frame (301), turn on the second motor (8) to drive the two support ring frames (2) closer to each other, generate pressure on the pressure block (4078), push the vertical tooth plate (4073) toward the metal pipe, so that each clamping head (4074) clamps and fixes the metal pipe in the center; S2. Probe device adjustment: the two support ring frames (2) are brought closer to each other, and the mounting column (307) is pushed toward the metal pipe via the connecting rod (310), thereby adjusting the distance between the ultrasonic probe (308) and the annular weld; S3, rotation speed adjustment: the two support ring frames (2) are brought closer to each other, and the conductive rod (905) is moved to adjust the resistance value of the resistor rod (902) connected to the circuit, thereby adjusting the rotation speed of the driving gear (405) when the first motor (406) is turned on; S4, rotation detection: Turn on the circuit switch so that the two first motors (406) are turned on at the same time, so that the driving gear (405) rotates to drive the rotating ring frame (301) to rotate, so that the ultrasonic probe (308) moves along the annular weld to perform detection.

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