CN218382537U

CN218382537U - Ultrasonic flaw detection device for detecting transverse defects of small-diameter pipe welding seam

Info

Publication number: CN218382537U
Application number: CN202221032550.8U
Authority: CN
Inventors: 凌文超
Original assignee: Tianjin City Siweiqi Testing Technology Co ltd
Current assignee: Tianjin City Siweiqi Testing Technology Co ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2023-01-24
Anticipated expiration: 2032-04-29

Abstract

The utility model provides a detect ultrasonic inspection device of small diameter pipe welding seam transverse defect, mechanical tong including fixed probe, the lift seat of drive machinery tong lift deflection, the guide rail of fixed lift seat and with guide rail both ends fixed connection's traction seat, the lift seat includes the pedestal, wear to locate the location axle in the pedestal, the lifting nut who is connected with the location axle, the closing cap of location lifting nut, with location axle sliding connection's angle adjusting block and lock the angle adjusting block in the angle lock nut on the pedestal, the lifting nut is rotatable to be fixed in on the pedestal, the cooperation of angle adjusting block and location axle flat surface, establish the angle range on the pedestal, this inspection device is applicable to the annular welding seam transverse defect detection of small diameter pipe production field, can guarantee the probe and the symmetry of being surveyed good contact and two probes between the pipe fitting, rotate the annular investigation detection that realizes the probe through cylinder drive inspection device, it has the universality to being surveyed the pipe fitting, on-the-site detection efficiency can effectively be improved.

Description

Ultrasonic flaw detection device for detecting transverse defects of small-diameter pipe welding seam

Technical Field

The utility model belongs to the technical field of nondestructive test, especially indicate an ultrasonic flaw detection device of detecting minor diameter pipe welding seam lateral defect.

Background

In order to ensure the welding quality of materials, the quality of a welding joint is generally inspected by adopting an ultrasonic flaw detection method, for the ultrasonic detection of the welding of pipes, the prior art has very many detection means for axial welding seams and annular welding seams of large-diameter pipes, and has few technical means for the ultrasonic detection of the annular welding seams of small-diameter pipes with the diameter of 32-159mm, in particular for the transverse defect detection of the welding seams, a single crystal oblique probe is generally adopted by domestic power plants for the field detection of the transverse defects of the annular welding seams of small-diameter pipes and is detected according to a conventional detection method, so that the reliability of detection results is insufficient due to the restriction of the following factors: 1) The method is limited by small radius and large curvature of the small-diameter pipe, and cannot be used for detecting transverse defects in an oblique and parallel manner like a large-diameter pipe; 2) When the tube wall of the small-diameter tube is thin and the conventional single crystal inclined probe is used for detection, the length of an incoming field area in the workpiece is large, and a blind area is large.

In addition, aiming at the small-diameter pipe flaw detection method, the prior art lacks a corresponding flaw detection device for the field production of the small-diameter pipe, manual movement is generally adopted for scanning a small amount of field detection, the large-scale detection generally drives the detected pipe to rotate to realize scanning detection, the two modes are not suitable for the production field, and due to the structural length diversity of the field pipe, the two methods are not suitable for the conventional detection procedure of the production field, so that the detection device corresponding to the flaw detection method is required to fix the probe and realize annular scanning to meet the field production requirement.

SUMMERY OF THE UTILITY MODEL

For solving the not enough of above prior art, the utility model provides a can carry out the ultrasonic flaw detection device of the horizontal defect witnessed inspections of minor diameter pipe circumferential weld.

The technical scheme of the utility model is realized like this:

detect ultrasonic inspection device of small diameter pipe welding seam lateral defect, include:

the two mechanical clamping hands for fixing the probe comprise a movable first clamping block, a fixed second clamping block and a fastening handle for fastening the first clamping block;

the two lifting seats drive the mechanical gripper to lift and deflect, and comprise a seat body, a positioning shaft penetrating through the seat body, a lifting nut in threaded connection with the positioning shaft, a sealing cover of the positioning lifting nut, an angle adjusting block in sliding connection with the positioning shaft, and an angle locking nut for locking the angle adjusting block on the seat body, wherein the lifting nut is rotatably fixed on the seat body through the sealing cover, the angle adjusting block is in fit connection with a flat surface on the positioning shaft, an indicating mark structure is arranged on the angle adjusting block, and an angle range surrounding the angle adjusting block is arranged on the seat body;

the guide rail is used for fixing the two lifting seats, a first sliding groove is formed in one side surface of the guide rail, the seat body is connected with the first sliding groove in a sliding mode, and the plane of the guide rail is provided with a measuring range for indicating the sliding distance of the seat body;

and the two traction seats are fixedly connected with the two ends of the guide rail and are respectively connected with the driving rollers on the two sides to synchronously rotate.

Preferably, a magnetic double traction wheel is arranged on the traction seat and is magnetically connected with the driving roller through the traction wheel.

More preferably, the upper plane of the guide rail is provided with a second sliding chute for the traction seat to slide.

Further preferably, a horizontal liquid column indicating the transverse level of the guide rail is embedded in the upper plane of the guide rail.

Further preferably, the angle range is provided with a zero point line, when the two probes are symmetrical and the included angle is 42 degrees, the scale mark indicated by the indicating mark structure is a zero point line

Further preferably, the base is provided with a dead lock handle for locking the position of the positioning shaft.

Compared with the prior art, the utility model discloses a device of detecting a flaw is applicable to the horizontal defect detection of annular weld of small diameter pipe production site, according to welding seam position and detected object's difference, the horizontal position and the deflection angle of accessible scale regulation probe, guarantee the symmetry of two probes, the vertical position adaptation of lift adjustment probe is different pipe diameters, guarantee the probe and surveyed good contact between the pipe fitting, reduce the operation degree of difficulty of probe detection work, and effectively guarantee the accuracy that detects, it sweeps and checks the detection to rotate the annular that realizes the probe through the roller drive device of detecting a flaw, compare in the rotation of prior art by the survey pipe fitting, it has the universality to being surveyed the pipe fitting, effectively improve witnessed inspections efficiency.

Drawings

FIG. 1 is a schematic view of the inspection state of the present invention;

FIG. 2 is a view showing a state of use of the flaw detector of the present invention;

fig. 3 is a plan view of the flaw detector of the present invention.

In the figure: 1. a guide rail 11, a first chute; 12. a second chute; 2. a traction seat 21 and a traction wheel; 22. A locking handle; 3. a lifting seat; 31. a base body; 32. an angle locking nut; 33. an angle adjusting block; 34. A lifting nut; 35. sealing the cover; 36. positioning the shaft; 361. flat surface; 37. locking the nail; 38. locking the handle; 4. a mechanical gripper; 41. a first clamping block; 42. fastening a handle; 43. a second clamp block; 5. a probe; 6. A pipe to be detected; 7. a drive roller; 8. a horizontal liquid column; a is the included angle of the probe.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 2-3, the ultrasonic flaw detection apparatus for detecting the transverse flaw of the weld joint of the small-diameter pipe of the present invention comprises two mechanical clamping hands 4 for fixing the probe 5, two lifting seats 3 for driving the mechanical clamping hands 4 to lift and deflect, a guide rail 1 for fixing the two lifting seats 3, and two traction seats 2 fixedly connected with two ends of the guide rail 1, wherein the mechanical clamping hands 4 are U-shaped clamping hands capable of realizing clamping and releasing operations and formed by a movable first clamping block 41, a fixed second clamping block 43, and a connecting column for connecting the first clamping block 41 and the second clamping block 43, and the fastening handle 42 for fastening the first clamping block 41 locks the probe 5 positioned therein; the lifting seat 3 comprises a seat body 31, a positioning shaft 36 penetrating through the seat body 31, a lifting nut 34 in threaded connection with the positioning shaft 36, a sealing cover 35 for positioning the lifting nut 34, an angle adjusting block 33 in sliding connection with the positioning shaft 36, and an angle locking nut 32 for locking the angle adjusting block 33 on the seat body 31, referring to fig. 2 again, the sealing cover 35 can lock the upper end boss of the lifting nut 34 on the seat body 31, so that the lifting nut 34 can rotate relative to the seat body 31, but cannot move longitudinally, when the elevation nut 34 is rotated, the angle adjusting block 33 is locked, the positioning shaft 36 slidably connected with the elevation nut 34 through the flat surface 361 cannot rotate, the positioning shaft 36 moves up and down relative to the elevation nut 34 to realize elevation adjustment of the probe 5, meanwhile, a locking handle 38 in threaded connection with the base body 31 is used for pressing the positioning shaft 36, the position of the positioning shaft 36 is locked, play in detection is prevented, a limit block arranged at the upper end of the positioning shaft 36 can limit a lift range, an angle locking nut 32 is in threaded connection with the base body 31, an angle adjusting block 33 can be tightly pressed and fixed on the base body 31 when the angle adjusting block is screwed, the angle adjusting block 33 can rotate relative to the base body 31 when the angle adjusting block is loosened, the positioning shaft 36 is driven to rotate to achieve angle adjustment of the probe 5 on the mechanical clamping hand 4, an indication mark structure is arranged on the angle adjusting block 33, an indication central line of the indication mark structure is located on a clamping central plane of the mechanical clamping hand 4, such as a mark line or a mark sharp corner, the seat body 31 is provided with an angle range surrounding the angle adjusting block 33, in order to adapt to the practical use condition and improve the adjusting efficiency, the angle range takes the optimal initial angle scribed line as a zero point line, namely, the indicating angle graduations when the two probes 5 are symmetrical and the included angle is 42 degrees, and the rotating angle of the probes 5 can be quickly adjusted according to the use condition; a first sliding chute 11 is formed in one side surface of the guide rail 1, the seat body 31 is in sliding connection with the first sliding chute 11 so as to adjust the relative positions of the two probes 5, the position of the two probes 5 can be locked through a locking nail 37 on the seat body 31, and the plane on the guide rail 1 is provided with a range indicating the sliding distance of the seat body 31 so as to finely adjust the transverse position of the probes 5; the two traction seats 2 are respectively connected with the driving rollers 7 arranged on the two sides to synchronously rotate, the driving rollers 7 are linked with an external power source, and the middle part of each driving roller 7 can be used for the detected pipe fitting 6 to penetrate through a detection area between the two driving rollers 7.

In order to adapt to the changeable detection demand in scene, set up the two traction wheel 21 that have magnetism on the traction seat 2, can dismantle magnetism through traction wheel 21 and driving drum 7 and be connected, in order to satisfy the needs of manual scanning and local scanning, can improve the reliability and the easy operability of manual scanning simultaneously under the supplementary of magnetism traction wheel 21, be equipped with the gliding second spout 12 of confession traction seat 2 on the upper plane of guide rail 1, can lock traction seat 2 position through locking handle 22, be convenient for adjust traction wheel 21 position according to different driving drum 7 spans, the horizontal liquid post 8 of the horizontal level of instruction guide rail 1 is inlayed on the plane on the guide rail 1 simultaneously, the magnetism hookup location of visual adjustment traction seat 2, guarantee that two traction seat 2 fixed positions are located same height.

Utilize the utility model discloses a flaw detection device detects the ultrasonic inspection of the horizontal defect of small diameter pipe welding seam, this flaw detection method refers to and satisfies the relevant regulation in energy industry standard NB/T47013.3-2015 and mechanical industry standard JB4730-1994, and this flaw detection method is only applicable to the small diameter pipe of carbon steel and low alloy material, and it includes:

step one, preparing a test piece, preparing the test piece which has the same material and curvature as the pipe 6 to be tested, manufacturing an artificial reflector in annular distribution according to the characteristics of the transverse defect of the circumferential weld of the pipe 6 to be tested, processing three transverse defects which are parallel to the axis of the test piece and are in annular distribution on the outer surface of the test piece to serve as the artificial reflector, wherein the depth is 1/4T, 1/2T and 3/4T respectively, the length is 5mm, the width is 0.2mm, and T is the wall thickness of the pipe 6 to be tested;

step two, detection configuration, namely selecting an A-type pulse reflection type ultrasonic flaw detector, a receiving single crystal angle probe and a transmitting single crystal angle probe special for a small-diameter tube, wherein the nominal frequency of the single crystal angle probe is 5MHZ, the size of a probe wafer is 6mm multiplied by 6mm, the refraction angle of the probe is 60-73 degrees, the contact surface of the receiving single crystal angle probe and the transmitting single crystal angle probe is provided with an arc surface, the curvature of the arc surface is 0.025-0.05, the receiving single crystal angle probe and the transmitting single crystal angle probe are symmetrically arranged outside two ends of a transverse defect, a probe included angle a is formed between the two probes 5, and the included angle a is more than or equal to 35 degrees and less than or equal to 45 degrees, as shown in figure 1;

determining an included angle a, according to the material characteristics of carbon steel and low alloy materials, for a small-diameter thin pipe with the diameter of 32-159mm and the wall thickness of 4-14mm, the included angle a of a probe is within the range of 35-45 degrees, the detection effect is good, according to experimental experience, the included angle of the probe is 42 degrees and serves as the optimal angle with the maximum probability, therefore, the included angle of the initially arranged probe is 42 degrees, detection is carried out by utilizing any artificial reflector in the step two, a coupling agent is coated between the contact surface of the two probes 5 and the surface of the test piece, the coupling agent adopts engine oil, the probes 5 face the direction of the artificial reflector, the included angle between the two probes 5 and the annular welding line is preset to be 21 degrees, and the angle when the artificial reflector reflects the highest echo can be quickly locked by respectively carrying out clockwise and anticlockwise sector checking at the proper distance of any artificial reflector, and is the optimal probe a;

step four, drawing a DAC curve, presetting and adjusting the included angles between two single-crystal oblique probes 5 and the annular welding line to be a/2 according to the probe included angle a in the step three, scanning three artificial reflectors on the test piece in sequence, firstly scanning and detecting the 1/4T artificial reflector, adjusting the highest echo amplitude to 80% of the full scale of the display screen by adjusting gain, then simultaneously moving the two probes 5 for parallel scanning, finding out the maximum echoes of the 1/2T artificial reflector and the 3/4T artificial reflector in sequence, marking on the display screen, and connecting the three points to automatically generate the DAC curve according to a standard flaw detector;

step five, actually measuring on site, assembling the flaw detection device and connecting and fixing the flaw detection device with a driving roller 7, polishing two sides of a welding seam of the detected pipe and brushing a coupling agent, positioning the welding seam of the detected pipe 6 in a detection area of the flaw detection device and fixing, respectively installing a receiving single crystal inclined probe and a transmitting single crystal inclined probe on the flaw detection device, adjusting the angle of the receiving single crystal inclined probe and the transmitting single crystal inclined probe according to the included angle a of the probes in the step three, adjusting a lifting seat 3 of the flaw detection device to ensure that the contact surface of the probe 5 is attached to the surface of the polished area of the detected pipe 6, ensuring that the gap between the two is less than 0.5mm, replacing the probe 5 with a proper cambered surface or length when the gap does not meet the requirement, or polishing the detected pipe 6 to meet the requirement of attachment degree, driving the flaw detection device to rotate for annular scanning, wherein the scanning mode of the probe 5 is shown in figure 1, the rotating angular speed of the flaw detection device is less than or equal to 20/R rad/s, R is the radius of the detected pipe 6, and the scanning coverage rate of the probe 5 is greater than 10% of the width of the probe 5;

step six, defect evaluation, wherein the evaluation index is as follows: (1) allowed defects: the amplitude of a single defect echo is less than DAC-10dB, and the indication length is not more than 5mm; (2) inadmissible defects: a. the amplitude of a single defect echo is larger than or equal to DAC-10dB; b. the single defect echo amplitude is less than DAC-10dB and the indication length is greater than 5mm.

In the description of the present invention, the directions or positional relationships indicated by the terms "upper plane", "horizontal", "vertical", etc. are all based on the use status and the directions and positional relationships shown in fig. 2 to 3, and are only for convenience of description and understanding of the present invention, which should not be taken as a limitation of the protection of the present invention.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Detect ultrasonic inspection device of small diameter pipe welding seam lateral defect, its characterized in that includes:

the two lifting seats drive the mechanical clamping hand to lift and deflect, and comprise a seat body, a positioning shaft penetrating through the seat body, a lifting nut in threaded connection with the positioning shaft, a sealing cover for positioning the lifting nut, an angle adjusting block in sliding connection with the positioning shaft, and an angle locking nut for locking the angle adjusting block on the seat body, wherein the lifting nut is rotatably fixed on the seat body through the sealing cover, the angle adjusting block is matched and connected with a flat surface on the positioning shaft, an indicating mark structure is arranged on the angle adjusting block, and an angle range surrounding the angle adjusting block is arranged on the seat body;

a first sliding groove is formed in one side surface of the guide rail for fixing the two lifting seats, the seat body is connected with the first sliding groove in a sliding mode, and a measuring range for indicating the sliding distance of the seat body is arranged on the upper plane of the guide rail;

2. The ultrasonic testing apparatus according to claim 1, characterized in that: the traction seat is provided with a magnetic double traction wheel, and the traction wheel is magnetically connected with the driving roller.

3. The ultrasonic testing apparatus according to claim 2, characterized in that: and a second sliding groove for the traction seat to slide is formed in the upper plane of the guide rail.

4. The ultrasonic testing apparatus according to claim 3, characterized in that: and a horizontal liquid column indicating the transverse level of the guide rail is embedded in the upper plane of the guide rail.

5. The ultrasonic testing apparatus according to claim 4, characterized in that: the angle range is provided with a zero point line, when the two probes are symmetrical and the included angle is 42 degrees, the scale mark indicated by the indicating mark structure is the zero point line.

6. The ultrasonic flaw detection apparatus according to any one of claims 1 to 5, characterized in that: and the base body is provided with a locking handle for locking the position of the positioning shaft.