A device and method for non-destructive testing of girth welds of metal pipes

Abstract

The application relates to the field of weld detection, and discloses a metal pipeline girth weld nondestructive detection device and method, which solves 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, and the adjustment is relatively troublesome. The device comprises a base, two symmetrical support ring frames arranged above the base, a relative moving piece arranged between the two support ring frames, and a clamping fixing assembly arranged on the support ring frame and used for centering and fixing the metal pipeline. The rotating detection assembly comprises a rotating ring frame arranged between the two support ring frames, an ultrasonic probe arranged on the inner side of the rotating ring frame and used for weld detection, and rotating ring plates arranged on the two sides of the rotating ring frame. The rotating ring plates are used for driving the rotating ring frame to rotate, and the rotating ring frame is arranged on the outer side of the metal pipeline, so that the ultrasonic probe can move along the girth weld 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 is rotated to 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 ultrasonic probe is convenient to replace and overhaul, 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 rollers are in rotary connection with the inner walls of the two hinge seats.

[0003] Due to different diameters of metal pipelines, when metal pipelines with different diameters 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

[0004] 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.

[0005] 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.

[0006] 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.

[0007] 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, the extrusion ring is fixedly connected with the end portions of the guide fixed plates, the side of each support ring frame away from the rotating ring frame is equiangularly provided with a centering and clamping piece, and the support ring frame and the rotating ring plate are provided with a rotating driving piece for driving the ultrasonic probe to move along the annular weld joint for detection.

[0008] 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 to one side of the vertical tooth plate and rotatably arranged in the fixed box.

[0009] 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.

[0010] Preferably, the rotating driving 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 side 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 a first motor, and the two first motors are connected in series.

[0011] 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 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.

[0012] 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.

[0013] Preferably, the relative moving part comprises sliding seats fixedly installed at the bottom ends of the support ring frames, both sliding seats are slidingly installed in the sliding grooves, the sliding grooves are arranged in the interiors of the bases, double-head screws are rotatably installed in the interiors of the sliding grooves, both sliding seats are in threaded connection with two opposite threaded grooves of the double-head screws, one end of the double-head screw 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.

[0014] 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, 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 inner sides of the front box, rod grooves are arranged in the moving plates, and the resistance rods are located in the rod grooves.

[0015] Preferably, electrically-conductive sliding strips are fixedly installed on the inner 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 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.

[0016] The application also provides a detection method of the metal pipeline girth weld nondestructive detection device.

[0017] S1, metal pipeline installation: inserting the metal pipeline into the inner sides 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 the clamping heads clamp, center and fix the metal pipeline;

[0018] S2, probe device adjustment: moving the mounting column towards the metal pipeline through the connecting rod, so as to adjust the distance between the ultrasonic probe and the girth weld;

[0019] S3, rotating speed adjustment: moving the electrically-conductive rods to adjust the resistance value of the resistance rods connected to the circuit, so as to adjust the rotating speed of the driving gear when the first motor is started;

[0020] S4, rotation detection: open the circuit switch, so that the two first motor is started at the same time, so that the driving gear rotation drive rotating ring frame rotation, so that the ultrasonic probe along the ring weld detection.

[0021] Compared with the prior art, the beneficial effects of the present application are:

[0022] (1) The present application, by moving the two support ring frames towards the rotating ring frame, the extrusion ring generates pressure on the pressure block, the clamping head is driven by the transverse tooth plate, the internal gear and the vertical tooth plate to move towards the metal pipeline, so that each clamping head is centered and clamped to the metal pipeline, facilitating the relative rotation of the rotating ring frame and the metal pipeline, and facilitating the weld detection;

[0023] (2) The present application sets the rotating ring frame between the two support ring frames, after the two support ring frames are clamped to each other, the mounting column is pushed to move towards the metal pipeline by 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 ultrasonic probe moves a greater distance towards the metal pipeline, so that the distance between the ultrasonic probe and the weld is within the detection suitable distance range when the diameter of the metal pipeline is different, the position of the ultrasonic probe is self-adaptively adjusted according to the diameter of the metal pipeline, and detection is facilitated;

[0024] (3) The present application is characterized in that the length of the resistance rod is proportional to the resistance of the resistance rod, and the two support ring frames move to drive the two conductive rods to move, when the diameter of the metal pipeline is larger, the resistance value of the first motor external circuit is larger, the rotation speed of the driving gear is smaller, the rotation speed of the rotating ring frame is slower, and when the diameter of the metal pipeline changes, the linear velocity of the ultrasonic probe moving along the ring weld is kept stable, facilitating detection. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation of the present application.

[0026] In the drawings:

[0027] Figure 1 is a structural schematic view of the metal pipeline girth weld nondestructive testing device of the present application;

[0028] Figure 2 is a structural schematic view of the relative moving part of the present application;

[0029] Figure 3 is a structural schematic view of the rotation detection assembly of the present application;

[0030] Figure 4 is a structural schematic view of the rotating ring frame of the present application;

[0031] Figure 5The structure schematic view of the rotating driving member of the present application is shown in the figure.

[0032] Figure 6 The structure schematic view of the centering clamping member of the present application is shown in the figure.

[0033] Figure 7 The structure schematic view of the rotating speed adjusting assembly of the present application is shown in the figure.

[0034] Figure 8 The circuit diagram of the present application is shown in the figure.

[0035] In the figure: 1, base; 2, support ring frame; 3, rotating detection assembly; 301, rotating ring frame; 302, rotating ring plate; 303, guide cross rod; 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 clamping member; 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, rotating 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

[0036] 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 the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] By Figures 1-8 The present application comprises a base 1, two support ring frames 2 are symmetrically arranged above the base 1, a rotating 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 member is arranged between the base 1 and the support ring frame 2.

[0038] The rotation detection assembly 3 comprises a rotating ring frame 301 arranged between the two support ring frames 2, the inner side of the rotating ring frame 301 is provided with an ultrasonic probe 308 for weld detection, the two sides of the rotating ring frame 301 are symmetrically provided with rotating ring plates 302, the two rotating ring plates 302 are respectively located on the side of the two support ring frames 2 close to each other, distance adjusting members are arranged between the rotating ring plates 302 and the ultrasonic probe 308, the inner side of the rotating ring plate 302 is equally angularly provided with a guide cross rod 303, and the two sides of the rotating ring frame 301 are equally angularly provided with guide fixed plates 304, the guide fixed plates 304 and the guide cross rod 303 are in sliding connection.

[0039] The distance adjusting member comprises a fixed cylinder 305 fixedly installed on the outer wall of the rotating ring frame 301, the fixed cylinder 305 is in communication 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 two sides of the fixed cylinder 305 are symmetrically provided with side sliding grooves 306, the two sides of the end of the installation column 307 away from the ultrasonic probe 308 are symmetrically provided with side sliding blocks 309, the side sliding blocks 309 and the side sliding grooves 306 are in sliding connection, the side of the side sliding block 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 ultrasonic probe 308 moves a greater distance towards the metal pipeline, so that when the diameter of the metal pipeline is different, the distance between the ultrasonic probe 308 and the weld is within a detection suitable distance range, the position of the ultrasonic probe 308 is self-adaptively adjusted with the diameter of the metal pipeline, and detection is facilitated.

[0040] 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.

[0041] 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 a 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.

[0042] 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.

[0043] 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.

[0044] A detection method of the metal pipeline circular weld nondestructive detection device, and the detection method is as follows:

[0045] 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;

[0046] 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 are synchronously moved 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;

[0047] During detection, the circuit switch is turned on, so that the two first motors 406 are energized, the driving gear 405 is rotated, 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.

[0048] 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 greater the diameter of the metal pipe, the greater the length of the resistance rod 902 inserted into the circuit and the resistance. The greater the diameter of the metal pipe, the slower the rotating ring frame 301 rotates, so that the linear velocity 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 device for non-destructive testing of girth welds of metal pipes, comprising a base (1), characterised in that: The upper part of the base (1) is symmetrically provided with two support ring frames (2), 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 piece is arranged between the base (1) and the support ring frame (2); 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), 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, of the rotating ring frame (301), distance adjusting pieces are arranged between the rotating ring plates (302) and the ultrasonic probe (308), guide cross bars (303) are equiangularly arranged on the inner side of the rotating ring plate (302), guide fixed plates (304) are equiangularly arranged on the two sides of the rotating ring frame (301), and the guide fixed plates (304) are slidably connected with the guide cross bars (303); 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, where the guide cross bar (303) is away from the rotating ring frame (301), of the rotating ring plate (302), the extrusion ring (401) is fixedly connected with the end portions of the guide fixed plates (304), and centering and clamping pieces (407) are equiangularly arranged on the side, where the two support ring frames (2) are away from each other, of each support ring frame (2); rotating driving pieces for driving the ultrasonic probe (308) to move and detect along the circular weld are arranged between the support ring frame (2) and the rotating ring plate (302); The centering and clamping piece (407) comprises a fixed box (4071) equiangularly arranged on the side, where the support ring frame (2) is away from the rotating ring frame (301), of the support ring frame (2), a limiting plate (4072) is slidably arranged in the fixed box (4071), a vertical tooth plate (4073) is arranged at the bottom end of the limiting plate (4072), the bottom end of the vertical tooth plate (4073) penetrates to the side, where the fixed box (4071) is close to the central axis of the support ring frame (2), a clamping head (4074) is arranged at the end portion of the vertical tooth plate (4073), an internal gear (4075) is meshedly connected on one side of the vertical tooth plate (4073), and the internal gear (4075) is rotatably arranged in the fixed box (4071); the distance adjusting piece comprises a fixed cylinder (305) fixedly arranged on the outer wall of the rotating ring frame (301), the fixed cylinder (305) is in communication 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), an installation column (307) is movably arranged in the fixed cylinder (305), the bottom end of the installation column (307) is fixedly connected with the ultrasonic probe (308), side sliding grooves (306) are symmetrically formed on the two sides of the fixed cylinder (305), and side sliding blocks (309) are symmetrically arranged on the two sides of the end, away from the ultrasonic probe (308), of the installation column (307). The upper engaging connection of the internal gear (4075) is connected with two transverse toothed plates (4077), the transverse toothed plates (4077) are slidingly installed in the guide sliding grooves (4076), the guide sliding grooves (4076) are symmetrically arranged on the fixed box (4071), the two transverse toothed plates (4077) are installed with a pressure block (4078) between the one end close to the rotating ring frame (301), the pressure block (4078) is in contact with the side of the extrusion ring (401) away from the rotating ring frame (301), and the side of the pressure block (4078) away from the fixed box (4071) is symmetrically installed with a reset spring (4079), one end of the reset spring (4079) is fixedly connected with the fixed box (4071).

2. A device for non-destructive testing of girth welds of metal pipes according to claim 1, characterized in that: The upper engaging connection of the internal gear (4075) is connected with two transverse toothed plates (4077), the transverse toothed plates (4077) are slidingly installed in the guide sliding grooves (4076), the guide sliding grooves (4076) are symmetrically arranged on the fixed box (4071), the two transverse toothed plates (4077) are installed with a pressure block (4078) between the one end close to the rotating ring frame (301), the pressure block (4078) is in contact with the side of the extrusion ring (401) away from the rotating ring frame (301), and the side of the pressure block (4078) away from the fixed box (4071) is symmetrically installed with a reset spring (4079), one end of the reset spring (4079) is fixedly connected with the fixed box (4071).

3. A device for non-destructive testing of girth welds of a metal pipe according to claim 2, characterized in that: The rotating drive member comprises a limiting rotating ring (403) fixedly installed on the rotating ring plate (302) close to the supporting ring frame (2), the limiting rotating ring (403) rotates in the limiting ring groove (402), the limiting ring groove (402) is arranged in the inside of the supporting ring frame (2), the outside of the rotating ring plate (302) is fixedly installed with a gear ring (404), the lower engaging connection of the gear ring (404) is connected with a driving gear (405), the driving gear (405) is fixedly connected with the output shaft of the first motor (406), and the two first motors (406) are connected in series.

4. A device for non-destructive testing of girth welds of a metal pipe according to claim 3, characterized in that: The one end of the connecting rod (310) close to the fixed cylinder (305) is obliquely arranged towards the side of the rotating ring frame (301).

5. A device for non-destructive testing of girth welds of a metal pipe according to claim 4, characterized in that: The relative moving member comprises a sliding seat (6) fixedly installed at the bottom end of the supporting ring frame (2), the two sliding seats (6) are slidingly installed in the sliding grooves (5), the sliding grooves (5) are arranged in the inside of the base (1), a double-head screw rod (7) is rotatingly installed in the inside of the sliding groove (5), the two sliding seats (6) are respectively screw-connected with two screw grooves with opposite directions arranged on the double-head screw rod (7), one end of the double-head screw rod (7) is fixedly connected with the output shaft of the second motor (8), the second motor (8) is fixedly installed on the base (1), the two first motors (406) are respectively installed on the two sliding seats (6), and the rotating speed adjusting assembly (9) is arranged between the two sliding seats (6).

6. A device for non-destructive testing of girth welds of a metal pipe according to claim 5, characterized in that: The rotating 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), the electric resistance rod (902) is fixedly installed between the two end inner walls of the front box (901), the moving plates (903) are installed on the two sliding seats (6), the moving plates (903) are located on the inside of the front box (901), the rod grooves (904) are arranged on the moving plates (903), and the electric resistance rod (902) is located in the inside of the rod groove (904).

7. A device for non-destructive testing of girth welds of a metal pipe according to claim 6, characterized in that: The front box (901) is fixedly installed with a conductive slide strip (906) on the inner wall of the side away from the sliding groove (5), the end of the moving plate (903) is installed with a conductive rod (905), the two ends of the conductive rod (905) are respectively in contact with the electric resistance rod (902) and the conductive slide strip (906), two wire terminals (907) are symmetrically installed on the front box (901), the wire terminals (907) are electrically connected with the conductive slide strip (906) through wires, two first motors (406), a battery and a switch are arranged in series between the two wire terminals (907).

8. A method of detecting a metal pipe girth weld nondestructive testing apparatus according to claim 7, characterized by, The detection method is as follows: S1, metal pipeline installation: insert the metal pipeline into the two support ring frames (2) and the inner side of the rotating ring frame (301), make the weld on the metal pipeline correspond to the position of the rotating ring frame (301), start the second motor (8) to drive the two support ring frames (2) to move close to each other, generate pressure on the pressure block (4078), push the vertical toothed plate (4073) to move towards the metal pipeline, so that each clamping head (4074) clamps, centers and fixes the metal pipeline; S2, probe device adjustment: the two support ring frames (2) move close to each other, the mounting column (307) is pushed to move towards the metal pipeline through the connecting rod (310), so as to adjust the distance between the ultrasonic probe (308) and the annular weld; S3, rotation speed adjustment: the two support ring frames (2) move close to each other, the resistance value of the resistance rod (902) connected to the circuit is adjusted through the conductive rod (905), so as to adjust the rotation speed of the driving gear (405) when the first motor (406) is started; S4, rotation detection: open the circuit switch, so that the two first motors (406) are started at the same time, the driving gear (405) is rotated to drive the rotating ring frame (301) to rotate, so that the ultrasonic probe (308) moves along the annular weld to detect.

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