CN115876893A

CN115876893A - Rotary ultrasonic flaw detection device suitable for different pipe diameters

Info

Publication number: CN115876893A
Application number: CN202211664280.7A
Authority: CN
Inventors: 宋勇利; 李粉荣; 王学宽
Original assignee: CHANGZHOU CHANGBAO JINGTE STEEL PIPE CO LTD
Current assignee: CHANGZHOU CHANGBAO JINGTE STEEL PIPE CO LTD
Priority date: 2022-12-23
Filing date: 2022-12-23
Publication date: 2023-03-31

Abstract

The invention discloses a rotary ultrasonic flaw detection device suitable for different pipe diameters, and relates to the technical field of ultrasonic flaw detection. The rotary ultrasonic flaw detection device suitable for different pipe diameters can better perform flaw detection on steel pipes, is simple in adjustment mode and high in efficiency, and can realize circumferential flaw spray marking and fixing points.

Description

Rotary ultrasonic flaw detection device suitable for different pipe diameters

Technical Field

The invention relates to a rotary ultrasonic flaw detection device suitable for different pipe diameters, and belongs to the technical field of ultrasonic flaw detection.

Background

Ultrasonic flaw detection is a method for detecting the flaw of a part by using the characteristic that ultrasonic energy penetrates into the deep part of a metal material and is reflected at the edge of an interface when the ultrasonic beam enters another section from the section.

The existing ultrasonic flaw detection device for the steel pipe mainly adopts two modes of spirally advancing a pipe, immobilizing an ultrasonic probe and linearly advancing the rotary pipe of the ultrasonic probe, and is applied to the linear advancing flaw detection treatment process of the rotary coffin of the ultrasonic probe, in order to ensure the accuracy of the ultrasonic probe in detecting the flaw of the convenient surface of the pipe, the rotary ultrasonic probe and the pipe are required to be coaxially arranged, so that the distance between the ultrasonic probe and the surface of the pipe is the same when the ultrasonic probe is at different positions, therefore, when the diameter of the pipe changes, the position of the ultrasonic probe is required to be adjusted, so that the ultrasonic probe and the pipe after the change are coaxial, the existing mode of adjusting the ultrasonic probe is generally that the position of the probe is adjusted, and in the process of vertically adjusting the probe, in order to ensure higher precision, the diameter of the pipe needs to be accurately measured, then a series of adjustments are carried out, and the adjustment process is troublesome and low in efficiency.

Disclosure of Invention

The invention aims to provide a rotary ultrasonic flaw detection device which is simple in adjustment mode and high in efficiency and is suitable for different pipe diameters.

In order to solve the technical problem, the invention provides a rotary ultrasonic flaw detection device suitable for different pipe diameters, which comprises a feeding conveying frame, a discharging conveying frame and a detection outer frame, wherein the feeding conveying frame and the discharging conveying frame are integrally connected, material rollers for conveying steel pipes are arranged on the feeding conveying frame and the discharging conveying frame, the detection outer frame is arranged between the feeding conveying frame and the discharging conveying frame, a liquid outlet support close to the feeding conveying frame and a detection support close to the discharging conveying frame are arranged in the detection outer frame, a plurality of limiting baffles are further arranged on two sides of the feeding conveying frame, a plurality of screw rod adjusting mechanisms for adjusting the limiting baffles to move along the length direction of the material rollers are arranged in the feeding conveying frame, a lifting adjusting mechanism for adjusting the liquid outlet support and the detection support to move vertically is arranged in the detection outer frame, a transmission mechanism is connected between the lifting adjusting mechanism and the screw rod adjusting mechanism, a first motor for driving the lifting adjusting mechanism to work is arranged at the top of the detection outer frame, and drives the lifting adjusting mechanism to work synchronously with the screw rod adjusting mechanism through the transmission mechanism.

Preferably, feeding carriage and ejection of compact carriage top surface all are equipped with the conveying groove who is used for the material roller installation, and are located conveying groove top surface bilateral symmetry on the feeding carriage and offer and be used for the gliding logical groove of limit baffle, limit baffle both sides face and the laminating of logical groove two symmetric lateral walls, and limit baffle hugs closely a side both ends of steel pipe and is equipped with the chamfer.

Preferably, screw rod adjustment mechanism is including rotating the worm wheel of connecting at the inside double-end screw of feeding carriage and installing in double-end screw one end, double-end screw both ends screw thread is opposite, and is located the equal thread bush in double-end screw's of limit baffle bottom of feeding carriage both sides outside.

Preferably, the lifting adjustment comprises four lifting screws arranged in the detection outer frame and chain wheel transmission members synchronously connected with the top ends of the four lifting screws, two side walls of the detection outer frame are fixedly connected with U-shaped frames supporting the bottom ends of the lifting screws, the bottom ends of the lifting screws penetrate through the U-shaped frames and are rotatably connected with the U-shaped frames through bearings, and the lifting screws are connected with the first motor in a group.

Preferably, the transmission mechanism comprises a worm in meshed connection with the worm gears and a gear transmission part which connects the worm with the end part of one group of lifting screw rods, one end of the worm is rotatably connected into the inner wall of the feeding conveying frame, and the other end of the worm penetrates through one end of the U-shaped frame and is rotatably connected to the other end of the U-shaped frame.

Preferably, the liquid outlet support and the detection support are both annular, the liquid outlet support and the detection support are coaxially arranged, a nozzle is arranged inside the liquid outlet support, and a detection probe is arranged inside the detection support.

Preferably, the two side surfaces of the detection support and the liquid outlet support are both extended outwards to form a convex block, and the middle part of the convex block is provided with a screw hole for the lifting screw rod to pass through.

Preferably, the liquid outlet support and the detection support are rotatably connected with the same rotating inner ring, an outer gear is fixedly connected to the outer side face of the rotating inner ring between the liquid outlet support and the detection support, a motor support is installed between the liquid storage support and the top of the detection support, and a second motor connected with the outer gear is installed on the motor support.

Preferably, a notch is formed in the top of the motor bracket corresponding to the outer gear, a main gear is fixedly connected to an output shaft of the second motor, and the bottom end of the main gear penetrates through the notch to be meshed with the outer gear.

Preferably, the number of the detection probes and the number of the nozzles are at least four, and a liquid inlet pipe connected with the nozzles is installed at the top of the liquid outlet support.

The invention has the positive effects that:

(1) According to the rotary ultrasonic flaw detection device, the limiting baffles are arranged on the two sides of the feeding conveying frame and are synchronously connected with the liquid outlet support and the inspection support through the screw rod adjusting mechanism, the transmission mechanism and the lifting adjustment mechanism, so that when steel pipes with different pipe diameters are subjected to flaw detection, the limiting baffles on the two sides of the feeding conveying frame can be driven to move by the lifting adjusting mechanism, the transmission mechanism and the screw rod adjusting mechanism, the limiting blocks of the steel pipes are realized, the steel pipes are prevented from being separated from or deflected from a material roller in the moving process, and the liquid outlet support and the inspection support are synchronously lifted when the limiting baffles move, so that the liquid outlet support and the inspection support are kept coaxial with the steel pipes, the steel pipes can be better detected in the detection process, the coaxial arrangement of the inspection support and the pipe can be realized without independently adjusting the inspection support and the liquid outlet support, the adjustment mode is simple, the efficiency is high, and the device is suitable for continuous flaw detection of pipes with different diameters; in addition, the detection support and the liquid outlet support are coaxially arranged and are driven by the same rotating inner ring, so that the liquid outlet support and the detection support can be driven by the second motor to work simultaneously, when a detection probe in the detection support works, the surface of a detected steel pipe can be ensured to be covered by a couplant solution sprayed out from a nozzle in the liquid outlet support, and the detection accuracy is ensured.

(2) The rotary ultrasonic flaw detection device of the invention refers to the flaw position of an object, namely the advancing direction of the carved position of a sample tube; the starting point of the probe is arranged to the position of the positioning spray mark, the nozzle is arranged according to the arrangement direction, the program calculates the position of the advancing direction of each probe lens after refraction according to the rotating speed, the distance between the probes, the arrangement direction, the advancing pitch, the working frequency of the probes and the sound velocity, and the position is transmitted to the corresponding spray mark direction to realize the spray mark in the circumferential direction, so that the ultrasonic automatic flaw detection positioning spray mark can be realized.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of another embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a feeding carriage according to an embodiment of the present invention;

FIG. 4 is a schematic top sectional view of a feed conveyor according to an embodiment of the invention;

FIG. 5 is a schematic side sectional view of a feed conveyor according to an embodiment of the invention;

FIG. 6 is a front view of a feed carriage of an embodiment of the present invention;

FIG. 7 is a schematic view of a detecting rack and a liquid-discharging rack according to an embodiment of the present invention;

fig. 8 is a sectional view of a detection bracket and a liquid-out bracket according to an embodiment of the invention.

The above reference numerals are as follows:

1. a feeding and conveying frame; 2. a discharge conveying frame; 3. detecting the outer frame; 4. a conveying groove; 5. a first motor; 6. a liquid inlet pipe; 7. a material roller; 8. a through groove; 9. a limiting baffle; 10. discharging the liquid from the liquid bracket; 11. detecting the bracket; 12. a U-shaped frame; 13. lifting a screw rod; 14. a sprocket drive member; 15. a second motor; 16. a gear transmission member; 17. a worm; 18. a double-ended screw; 19. a nozzle; 20. detecting a probe; 21. rotating the inner ring; 22. an outer gear; 23. a motor bracket.

Detailed Description

Examples

Referring to fig. 1 to 4, the rotary ultrasonic flaw detection device adapted to different pipe diameters of this embodiment includes a feeding carrier 1, a discharging carrier 2 and a detection outer frame 3, the feeding carrier 1 and the discharging carrier 2 are integrally connected, the feeding carrier 1 and the discharging carrier 2 are respectively provided with a material roller 7 for conveying a steel pipe, and two ends of the material roller 7 are gradually reduced in diameter toward the center so as to be adapted to conveying pipes of different diameters. The detection frame 3 is arranged between the feeding conveying frame 1 and the discharging conveying frame 2, a liquid outlet support 10 close to the feeding conveying frame 1 and a detection support 11 close to the discharging conveying frame 2 are arranged in the detection frame 3, the liquid outlet support 10 is located before the detection support 11, couplant solution is sprayed on the surface of a pipe before detection is achieved, a plurality of limiting baffles 9 are further arranged on two sides of the feeding conveying frame 1, one limiting baffle is arranged on one side between two adjacent material rollers 7, a plurality of screw rod adjusting mechanisms for adjusting the limiting baffles 9 to move along the length direction of the material rollers 7 are arranged in the feeding conveying frame 1, two symmetrical limiting baffles 9 are adjusted by one screw rod adjusting mechanism, a lifting adjusting mechanism for adjusting the liquid outlet support 10 and the vertical movement of the detection support 11 is installed in the detection frame 3, a transmission mechanism is connected between the lifting adjusting mechanism and the screw rod adjusting mechanism, a first motor 5 for driving the lifting adjusting mechanism to work is installed at the top of the detection frame 3, the first motor 5 is a servo motor, and can rotate forwards and backwards. Wherein the first motor 5 drives the lifting adjusting mechanism and the screw rod adjusting mechanism to work synchronously through the transmission mechanism, thereby realizing that the first motor 5 works to drive the limit baffle 9, the liquid outlet support 10 and the detection support 11 to work simultaneously, and the moving distances of the three during working are the same.

Referring to fig. 1-4, feeding

carriage

1 and 2 top surfaces of ejection of compact carriage all are equipped with conveying groove 4 that is used for material roller 7 to install, conveying groove 4's centre is sunken downwards, in order to make things convenient for material roller 7 to install, and be located conveying groove 4 top surface bilateral symmetry on feeding carriage 1 and offer the logical groove 8 that is used for limit baffle 9 to slide, limit baffle 9 slides in leading to groove 8, can be when not influencing material roller 7 work, realize spacing to tubular product on material roller 7, limit baffle 9 both sides face and the laminating of leading to 8 bilateral symmetry lateral walls, guarantee stability when limit baffle 9 slides, and limit baffle 9 hugs closely a side both ends of steel pipe and is equipped with the chamfer, make things convenient for the transportation of tubular product in limit baffle 9, influence when avoiding carrying the tubular product, install the pressure sensors on the side of limit baffle 9 and tubular product contact simultaneously, can respond to when limit baffle 9 and tubular product contact, thereby avoid limit baffle 9 to continue to remove, simultaneously for the control of cooperation to first motor 5, can also install the controller in order to realize the electricity with first motor 5, respond to the back by the control cabinet of pressure sensors, stop the motor control cabinet by first motor 5.

Referring to fig. 3 to 6, the screw adjusting mechanism comprises a double-threaded screw 18 rotatably connected inside the feeding conveying frame 1 and a worm wheel installed at one end of the double-threaded screw 18, the bottom ends of the limiting baffles 9 located at two sides of the feeding conveying frame 1 are all in threaded sleeve on the outer side of the double-threaded screw 18, and threads at two ends of the double-threaded screw 18 are opposite to each other, so that when the double-threaded screw 18 works, the two limiting baffles 9 above move in opposite directions, and then the pipe can be drawn close to or kept away from each other.

Referring to fig. 3-6, lifting adjusting is including establishing four elevating screw 13 and the chain wheel driving medium 14 on four elevating screw 13 tops of synchronous connection in detecting frame 3, chain wheel driving medium 14 mainly comprises the chain wheel of installing on elevating screw 13 and the chain of connecting a plurality of chain wheels, go on in step with realizing a plurality of elevating screw 13, simultaneously in order to avoid the chain to break away from, the bottom coaxial fixation at the chain wheel has the backup pad, in addition still for the stability of guaranteeing elevating screw 13 installation, the U type frame 12 of elevating screw 13 bottom is supported to equal fixedly connected with of both sides wall that detects frame 3, elevating screw 13's bottom runs through U type frame 12 and is connected through the bearing rotation with U type frame 12, in order to accomplish the fixed mounting to elevating screw 13, and wherein a set of elevating screw 13 is connected with first motor 5.

The transmission mechanism comprises a worm 17 in meshed connection with a plurality of worm wheels and a gear transmission piece 16 connected with the worm 17 and the end part of one group of lifting screw rods 13, the gear transmission piece 16 consists of two bevel gears which are meshed with each other, wherein the two bevel gears are respectively installed at the end part of the lifting screw rods 13 and the end part of the worm 17, one end of the worm 17 is rotatably connected in the inner wall of the feeding conveying frame 1, the other end of the worm 17 penetrates through one end of the U-shaped frame 12 and is rotatably connected to the other end of the U-shaped frame 12, and therefore the worm 17 is horizontally and firmly fixed and can rotate on the U-shaped frame 12.

Referring to fig. 6 to 8, the liquid outlet bracket 10 and the detection bracket 11 are both annular, the liquid outlet bracket 10 and the detection bracket 11 are coaxially arranged, a nozzle 19 is arranged inside the liquid outlet bracket 10, and a detection probe 20 is arranged inside the detection bracket 11. Detecting probe 20 all is annular array with nozzle 19 and is provided with four at least for more whole sprays couplant solution to tubular product surface by nozzle 19, also can be more convenient simultaneously to tubular product surface detection, detecting probe 20's tip is electric putter, can also adjust detecting probe 20's flexible regulation, wherein go out the top of liquid support 10 and install the feed liquor pipe 6 of connecting a plurality of nozzles 19, feed liquor pipe 6 is used for external couplant solution, carry couplant solution to nozzle 19.

The two side surfaces of the detection support 11 and the liquid outlet support 10 are both extended outwards to form a convex block, and a screw hole for the lifting screw 13 to pass through is formed in the middle of the convex block, so that when the lifting screw 13 rotates, the convex block can drive the detection support 11 and the liquid outlet support 10 to lift.

The liquid outlet support 10 and the detection support 11 are connected with the same rotating inner ring 21 in a rotating mode, the nozzle 19 and the detection probe 20 are connected to the inner wall of the rotating inner ring 21, an outer gear 22 is fixedly connected to the outer side face of the rotating inner ring 21 between the liquid outlet support 10 and the detection support 11, a motor support 23 is installed between the liquid storage support and the top of the detection support 11, and a second motor 15 connected with the outer gear 22 is installed on the motor support 23. The top of the motor support 23 is provided with a notch corresponding to the external gear 22, an output shaft of the second motor 15 is fixedly connected with a main gear, and the bottom end of the main gear penetrates through the notch to be meshed with the external gear 22, so that when the second motor 15 works, the external gear 22 can be driven to rotate, and the inner ring 21 is driven to rotate in the detection support 11 and the liquid outlet support 10.

Referring to fig. 8, an annular water channel is formed on the outer wall of a rotating inner ring 21 in the liquid outlet support 10, a coupling agent solution is conveyed into the water channel by a liquid inlet pipe 6 and then conveyed to a nozzle 19 by the water channel, a sealing ring and a bearing for ensuring the connection between the rotating inner ring 21 and the liquid outlet support 10 and facilitating the rotation of the rotating inner ring 21 are arranged on both sides of the water channel, and an electric brush coupling is arranged between the rotating inner ring 21 and the detecting support 11 for ensuring the power supply of the detecting probe 20 and an end electric push rod when the rotating inner ring 21 rotates, so as to ensure the normal operation of the detecting probe 20 during rotation.

The working principle is as follows: in the steel pipe flaw detection process, after the pipe diameter of a steel pipe changes, a new steel pipe is placed on a material roller 7 on a feeding conveying frame 1, a first motor 5 is started to work, the first motor 5 works to drive a lifting screw 13 connected with the first motor to rotate, four lifting screws 13 synchronously rotate under the driving and matching of a chain wheel transmission piece 14, a liquid outlet support 10 and a detection support 11 are driven to synchronously lift in a detection outer frame 3, the lifting screws 13 simultaneously rotate, a worm 17 is driven to synchronously rotate by a gear transmission piece 16, the worm 17 rotates to drive a plurality of worm gears meshed with the worm gears to synchronously rotate, the worm gears rotate to drive a plurality of double-headed screws 18 to synchronously rotate, finally, a limit baffle 9 on the double-headed screws 18 moves in a through groove 8, and the first motor 5 is stopped until the side surface of the limit baffle 9 is contacted with the steel pipe, at the moment, the axes of the detection bracket 11 and the liquid outlet bracket 10 move to be consistent with the axis of the existing steel pipe at the same time, namely, the distances from a plurality of nozzles 19 in the detection bracket 11 to the steel pipe are the same, the distances from a plurality of detection probes 20 to the surface of the steel pipe are also the same, the second motor 15 is started, the second motor 15 drives the main gear and the external gear 22 to rotate, further drives the inner rotating ring 21 to rotate, the inner rotating ring 21 rotates to drive the nozzles 19 and the detection probes 20 to rotate, the liquid inlet pipe 6 is connected with a water pump water outlet connected with a coupling agent, the rotating nozzles 19 spray the coupling agent to the surface of the steel pipe, so that the omnibearing spraying on the surface of the steel pipe is realized, meanwhile, the detection probes 20 rotate to detect the surface of the steel pipe adhered with the coupling agent, after the detection is finished, the feeding and the conveying frame 1 conveys the steel pipe forwards, the subsequent steel pipe continues to detect flaws, and then circulates;

when the limit baffle 9 is in contact with the steel pipe in the process, because the axis of the steel pipe on the material roller 7 is always located in the middle of the feeding conveying frame 1, when the diameter of the steel pipe changes, the distance from the axis of the steel pipe to the bottom of the middle of the material roller 7 changes, if the diameter of the steel pipe becomes larger, the distance becomes larger, the increased distance is the length from the radius of the existing steel pipe to the radius of the original steel pipe, and meanwhile, the length from the two sides of the steel pipe to the limit baffle 9 is also the length from the radius of the existing steel pipe to the radius of the original steel pipe, when the limit baffle 9 is in contact with the steel pipe, the axis of the detection support 11 and the axis of the liquid outlet support 10 are already moved to be consistent with the axis of the existing steel pipe, namely, the steel pipe and the rotating inner ring 21 are in a coaxial state.

The rotary ultrasonic flaw detection device suitable for different pipe diameters can realize automatic ultrasonic flaw detection positioning of the jet marks, and the specific method is that a host and a transmission roller way are provided with encoders to measure the length distance and the steering distance, when a flaw on a sample pipe is measured by a certain probe according to a fixed position, the detection positions of other probes 20 can know the other circumferential flaw position according to the arrangement position, the rotating speed and the feeding screw pitch if the flaw is found, and thus the circumferential nozzle 19 is determined to mark the position according to the jet mark distance through calculation.

The motors in the length direction and the circumferential direction are provided with encoders to measure the linear running length and each probe 20 detects the wound distance according to a 1/4 difference spiral to know the two-dimensional position of the wound; the instrument calculates the eccentricity of the probe 20 according to the outer diameter and the wall thickness of the sound velocity focal length steel pipe, and the position difference between the position of the probe and the position of the flaw can be adjusted to determine the position more accurately. The circumferential nozzles 19 are arranged, and the grinding range can be reduced by adopting 8 spray mark directions in view of the outer diameter size range of 16-89 mm of the produced pipe. The circumferential one-circle time is divided by 4, the time sequence sections of four time intervals are changed without stopping, two channels (a pitch time interval) of the same group of probes are communicated to the corresponding intervals through a time trigger, and the marks are sprayed to the defect positions at fixed angles, fixed positions, fixed distances and fixed positions.

It should be understood that the above-described embodiments are merely examples for clearly illustrating the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And such obvious variations or modifications which fall within the spirit of the invention are intended to be covered by the scope of the present invention.

Claims

1. A rotary ultrasonic flaw detection device suitable for different pipe diameters, which comprises a feeding conveying frame (1), a discharging conveying frame (2) and a detection outer frame (3), it is characterized in that the feeding conveying frame (1) and the discharging conveying frame (2) are integrally connected, material rollers (7) for conveying steel pipes are arranged on the feeding conveying frame (1) and the discharging conveying frame (2), the detection outer frame (3) is arranged between the feeding conveying frame (1) and the discharging conveying frame (2), a liquid outlet support (10) close to the feeding conveying frame (1) and a detection support (11) close to the discharging conveying frame (2) are arranged in the detection outer frame (3), a plurality of limit baffles (9) are arranged on two sides of the feeding conveying frame (1), a plurality of screw rod adjusting mechanisms for adjusting the limit baffles (9) to move along the length direction of the material roller (7) are arranged in the feeding conveying frame (1), a lifting adjusting mechanism for adjusting the vertical movement of the liquid outlet support (10) and the detection support (11) is arranged in the detection outer frame (3), a transmission mechanism is connected between the lifting adjusting mechanism and the screw rod adjusting mechanism, a first motor (5) for driving the lifting adjusting mechanism to work is arranged at the top of the detection outer frame (3), wherein the first motor (5) drives the lifting adjusting mechanism and the screw adjusting mechanism to synchronously work through the transmission mechanism.

2. The rotary ultrasonic flaw detection device suitable for different pipe diameters of claim 1, wherein conveying grooves (4) for mounting material rollers (7) are formed in the top surfaces of the feeding conveying frame (1) and the discharging conveying frame (2), through grooves (8) for sliding of limiting baffles (9) are symmetrically formed in two sides of the top surface of each conveying groove (4) on the feeding conveying frame (1), two side surfaces of each limiting baffle (9) are attached to two symmetric side walls of each through groove (8), and chamfers are arranged at two ends of one side surface, close to a steel pipe, of each limiting baffle (9).

3. The rotary ultrasonic flaw detection device suitable for different pipe diameters according to claim 1, wherein the screw rod adjusting mechanism comprises a double-threaded screw rod (18) rotatably connected inside the feeding conveying frame (1) and a worm gear installed at one end of the double-threaded screw rod (18), threads at two ends of the double-threaded screw rod (18) are opposite, and bottom ends of limiting baffle plates (9) located at two sides of the feeding conveying frame (1) are respectively sleeved outside the double-threaded screw rod (18) in a threaded manner.

4. The rotary ultrasonic flaw detection device suitable for different pipe diameters of claim 3, wherein the lifting adjustment comprises four lifting screws (13) arranged in the detection outer frame (3) and a chain wheel transmission member (14) synchronously connected with the top ends of the four lifting screws (13), both side walls of the detection outer frame (3) are fixedly connected with U-shaped frames (12) supporting the bottom ends of the lifting screws (13), the bottom ends of the lifting screws (13) penetrate through the U-shaped frames (12) and are rotatably connected with the U-shaped frames (12) through bearings, and one group of the lifting screws (13) is connected with the first motor (5).

5. The rotary ultrasonic flaw detection device suitable for different pipe diameters according to claim 4, wherein the transmission mechanism comprises a worm (17) in meshed connection with a plurality of worm gears and a gear transmission member (16) connecting the worm (17) with the end part of one group of lifting screw rods (13), one end of the worm (17) is rotatably connected in the inner wall of the feeding conveying frame (1), the other end of the worm penetrates through one end of the U-shaped frame (12), and the worm is rotatably connected to the other end of the U-shaped frame (12).

6. The rotary ultrasonic flaw detection device suitable for different pipe diameters according to claim 4, wherein the liquid outlet support (10) and the detection support (11) are both annular, the liquid outlet support (10) and the detection support (11) are coaxially arranged, a nozzle (19) is arranged inside the liquid outlet support (10), and a detection probe (20) is arranged inside the detection support (11).

7. The rotary ultrasonic flaw detection device suitable for different pipe diameters of claim 6, wherein the two side surfaces of the detection support (11) and the liquid outlet support (10) are respectively provided with a convex block extending outwards, and the middle part of each convex block is provided with a screw hole for a lifting screw rod (13) to pass through.

8. The rotary ultrasonic flaw detection device suitable for different pipe diameters according to claim 6, wherein the liquid outlet support (10) and the detection support (11) are rotatably connected with the same rotating inner ring (21), an outer gear (22) is fixedly connected with the outer side surface of the rotating inner ring (21) between the liquid outlet support (10) and the detection support (11), a motor support (23) is installed between the liquid storage support and the top of the detection support (11), and a second motor (15) connected with the outer gear (22) is installed on the motor support (23).

9. The rotary ultrasonic flaw detection device suitable for different pipe diameters according to claim 8, wherein a notch is formed in the top of the motor support (23) corresponding to the external gear (22), a main gear is fixedly connected to an output shaft of the second motor (15), and the bottom end of the main gear penetrates through the notch to be meshed with the external gear (22).

10. The rotary ultrasonic flaw detection device adapting to different pipe diameters of the claim 9, wherein the number of the detection probes (20) and the number of the nozzles (19) are at least four, and the liquid inlet pipe (6) connected with the nozzles (19) is installed at the top of the liquid outlet bracket (10).