Phased array detection device for corner joint

Abstract

The utility model discloses a phased array detection device for an angle joint, which can be used for nondestructive detection of a fillet weld of a small connecting pipe with limited detection space, and comprises a pressure vessel plug-in type small connecting pipe, a scanning mechanism, a guide limiting mechanism, a probe and a clamping mechanism. The scanning mechanism is adsorbed on the outer circumferential surface of the inserted small connecting pipe of the pressure vessel through a magnetic suction roller and can rotate along the outer circumferential surface of the small connecting pipe, a position sensor is fixed on the scanning mechanism, and accurate positioning of defects in the scanning process can be determined by recording the central angle of the magnetic suction roller after rolling. The guide limiting mechanism adopts an adjustable limiting column, one end of the guide limiting mechanism is connected with the scanning mechanism, the other end of the guide limiting mechanism is connected with the probe and the clamping mechanism, and during measurement, the limiting column can be adjusted according to the pipe diameter of the small connecting pipe and the field use condition of the scanning device to enable the probe to face a corner joint of the small connecting pipe and point to the circle center of the small connecting pipe. And the detection precision and efficiency are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of phased array ultrasonic detection, and particularly relates to a phased array ultrasonic detection scanning device applied to a pressure vessel plug-in type small nozzle corner joint. BACKGROUND

[0002] Small nozzles generally refer to branch pipe structures with a nominal diameter of less than or equal to 50 mm, which are connected to pipelines, valves, instruments, safety relief devices, etc. by means of welding, and are opened on the body of a pressure vessel or a pipeline. Due to the discontinuous structure of the welding seam of the small nozzle, and the scouring of the medium flow field during service, corrosion or cracking easily occurs, causing leakage and posing a safety hazard.

[0003] In the industry, ultrasonic and phased array ultrasonic technologies are generally used to periodically detect surface defects and embedded defects of small nozzle corner welds. However, the existing scanning devices have limitations such as high requirements for on-site detection conditions, detection of internal surfaces, and a nominal diameter of the nozzle greater than 50 mm.

[0004] A nuclear reactor pressure vessel nozzle intersection surface ultrasonic inspection device (publication number: CN204740869U) uses a drive cylinder to drive a connecting rod to control the contraction or expansion of a scanning arm. A probe holder is provided on the scanning arm. The scanning device can expand and contract by adapting to changes in the outer shape of the surface and ensure that the probe is in contact with the detected surface. However, this scanning device is not suitable for on-site detection and has low detection efficiency because it is driven by a cylinder and does not have position recording information. An automatic nozzle corner weld phased array detection device capable of bidirectional scanning (publication number: CN110031551A) completes the contact of the nozzle outer surface, the determination of the probe movement track, and the bidirectional scanning of the probe through the cooperation of the walking mechanism, locking mechanism, automatic adjustment module, probe rack sliding rod assembly, nozzle probe arm, and control structure. However, this device is not suitable for small nozzles (20mm≤DN≤50mm) due to structural limitations and has certain requirements for on-site detection space. For nozzles with different nominal diameters, the locking mechanism and the automatic adjustment module need to be frequently adjusted, which affects the detection efficiency. A small-diameter nozzle ultrasonic phased array detection auxiliary device (publication number: CN218995251U) rotates along the end face of the flange through a rotating wheel to ensure that the phased array probe rotates one round along the inside of the welded joint between the small-diameter nozzle and the parent pipe to complete the detection. However, this detection device is only suitable for flange nozzles, and the detection surface is the inside surface of the small-diameter nozzle.

[0005] To solve the above problems, a phased array ultrasonic detection scanning device applied to a pressure vessel plug-in type small nozzle corner joint is provided. UTILITY MODEL CONTENTS

[0006] In order to overcome the shortcomings of the existing technology, the utility model proposes a phased array ultrasonic detection and scanning device specially used for pressure vessel inserted small pipe corner joints. The device can adjust the probe position through a guide limit mechanism within a limited space, adapt to the pipe height and the height of the workpiece surface, maintain the relative distance and relative angle between the probe and the corner joint unchanged during the scanning process, and complete the positioning of defects through a fixed position sensor, thereby improving detection efficiency and accuracy.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A phased array detection device for corner joints comprises: a small pipe I inserted into a pressure vessel, a scanning mechanism II, a guide and limit mechanism III, and a probe and clamping mechanism IV; the scanning mechanism II is arranged on the outer circumference of the small pipe I inserted into the pressure vessel, and is adsorbed on the outer circumference of the small pipe via a magnetic roller and performs rotational scanning; the guide and limit mechanism III is connected to the scanning mechanism II at one end and to the probe and clamping mechanism IV at the other end; the probe is connected to an external instrument via a cable.

[0009] The aforementioned phased array detection device for corner joints, the pressure vessel inserted small pipe I, is connected by a flat plate 1 and a small pipe 2 through a corner weld 3; the flat plate 1 and the small pipe 2 are both made of carbon steel or low alloy steel, the nominal diameter D of the small pipe 2 should satisfy 50mm≥D≥20mm, and the wall thickness t should satisfy 6mm≥t≥2.5mm; the welding structure adopted by the corner weld 3 is an inserted type, and the welded joint formed is a butt joint.

[0010] In the aforementioned phased array detection device for a corner joint, the scanning mechanism II is fixed to a movable bracket 5 by two magnetic rollers 4 through a threaded connection, and the position sensor 6 is tangent to the outer circumferential surface of the small pipe, connected to the movable bracket 5, and located in the middle of the movable bracket 5; the magnetic roller 4 is tightly attached to and tangent to the outer circumferential surface of the small pipe 2 and can roll along the outer circumferential surface of the small pipe 2; during the scanning process, the center of the position sensor 6 and the center of the probe 12 are on the same normal plane of the small pipe.

[0011] In the aforementioned phased array detection device for corner joints, the guide and limiting mechanism III is composed of a vertical limiting column 1 7, a radial limiting column 8, and a vertical limiting column 2 9 connected by screws and folding plates;

[0012] The vertical limiting column 1 7 is connected to the movable bracket 5 at one end and to the radial limiting column 8 at the other end; the movable bracket 5 can slide in the vertical direction and drive the vertical limiting column 1 to move in the vertical direction;

[0013] The radial limiting column 8 is connected to the vertical limiting column 1 7 at one end and to the vertical limiting column 2 9 at the other end; the radial limiting column 8 slides along the radial direction of the small pipe with the help of the vertical limiting column 1;

[0014] The vertical limiting column 2 9 has one end connected to the radial limiting column 8 and the other end connected to the clamp 10; the vertical limiting column 2 9 slides along the vertical direction with the help of the radial limiting column 8 and the vertical limiting column 1 7.

[0015] The aforementioned phased array detection device for a corner joint, the clamping mechanism IV, is composed of a clamp 10 with one end connected to the vertical limit column 2 9 by a thread, and the other end clamps the wedge 11 through two rotating shafts set on the clamp; the probe 12 is fixed with screws on the wedge 11, and the wedge 11 can be rotated around the rotating shaft according to the actual measured small pipe to ensure the contact effect between the bottom surface of the wedge and the surface of the workpiece.

[0016] In the aforementioned phased array detection device for corner joints, the two magnetic rollers 4 have equal specifications, the movable bracket 5 is a symmetrical structure with a "V"-shaped cross-section, and the two magnetic rollers 4 are respectively arranged at the two ends of the movable bracket 5. Beneficial effects

[0017] (1) This utility model proposes a phased array ultrasonic inspection and scanning device specifically for pressure vessel insert-type small pipe corner joints. The device is equipped with a magnetic adsorption roller that can rotate around the pipe once, which can replace the handheld probe for scanning. It is better for non-destructive testing of small pipe corner welds (nominal diameter D, 50mm ≥ D ≥ 20mm; wall thickness t, 6mm ≥ t ≥ 2.5mm) with limited inspection space, thereby improving the efficiency of defect detection and having good practicality.

[0018] (2) The utility model proposes a phased array ultrasonic inspection and scanning device for pressure vessel insertable small pipe angle joints. The scanning mechanism of the device is provided with a position sensor that can record the movement trajectory of the magnetic adsorption roller and the probe, thereby improving the positioning accuracy of defects.

[0019] (3) The utility model proposes a phased array ultrasonic detection and scanning device for pressure vessel inserted small pipe corner joints. The device is provided with a probe clamping block and a guide limit column, which can adjust and set the probe position, adapt to the height of the pipe, and ensure that the relative distance and relative angle between the probe and the small pipe corner weld remain unchanged during the scanning process. It has high detection accuracy and a wide detection range. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a phased array ultrasonic inspection and scanning device for inserting small pipe angle joints of pressure vessels according to the present invention;

[0021] Figure 2 for Figure 1 Structure diagram of the small pipe I of the pressure vessel insertion type in the application;

[0022] Figure 3 As Figure 1 Structure diagram of the scanning mechanism II in the application;

[0023] Figure 4 As Figure 1 Structure diagram of the guiding and limiting mechanism III in the application;

[0024] Figure 5 As Figure 1 Structure diagram of the probe and clamping mechanism IV in the application.

[0025] Mark explanation: I-small pipe of pressure vessel insertion type, II-scanning mechanism, III-guiding and limiting mechanism, IV-probe and clamping mechanism, 1-flat plate, 2-small pipe, 3-corner weld, 4-magnetic roller, 5-movable support, 6-position sensor, 7-vertical limiting column one, 8-radial limiting column, 9-vertical limiting column two, 10-clamper, 11-wedge block, 12-probe, 13-cable. DETAILED DESCRIPTION

[0026] In order to make the person skilled in the art better understand the technical scheme of the application, the technical scheme in the embodiments of the application will be described clearly and completely below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, not all the embodiments, and are not intended to limit the scope of the application disclosed. After the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concept of the application. Based on the embodiments in the application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of the application.

[0027] The structure schematic diagram according to the disclosed embodiments of the application is shown in the drawings. These drawings are not drawn to scale, in which some details are enlarged for the purpose of clear expression, and some details can be omitted. The shapes of various regions, layers and their relative size and position relationship shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and the person skilled in the art can additionally design regions / layers with different shapes, sizes and relative positions according to actual needs. EMBODIMENTS

[0028] As Figure 1As shown, the present invention provides a phased array ultrasonic scanning device for inspecting corner joints of small, inserted pressure vessel pipes. The device comprises: a small, inserted pressure vessel pipe I, a scanning mechanism II, a guide and limit mechanism III, and a probe and clamping mechanism IV. Scanning mechanism II is mounted on the circumference of the small, inserted pressure vessel pipe I and can rotate along the outer circumference of the pipe. Guide and limit mechanism III is connected to scanning mechanism II at one end and to the probe and clamping mechanism IV at the other end.

[0029] The specific configuration and function of the present invention are described below:

[0030] like Figure 2 As shown, for a pressure vessel insert-type small pipe I, a hole is opened in plate 1 using fillet weld 3, which connects to small pipe 2. This is a typical service condition for a small pipe. Plate 1 is a pressure vessel cylinder or pipe, with a recommended wall thickness T ≥ 6mm. The material setting is carbon steel or low-alloy steel, and other pressure vessel steels can also be set. Changes to the setting require adjustments to related components such as probes and wedges. Small pipe 2 must meet the following requirements: nominal diameter D, 50mm ≥ D ≥ 20mm; wall thickness t, 6mm ≥ t ≥ 2.5mm; and material setting is carbon steel or low-alloy steel. Fillet weld 3 uses an insert-type welding structure, and the weld joint is a butt joint. The specific setting method should meet the basic requirements of relevant regulations.

[0031] like Figure 3 As shown, scanning mechanism II: Two magnetic rollers 4 of equal size are threadedly fixed to a movable bracket 5 (the movable bracket has a "V"-shaped cross-section). A position sensor 6 is tangential to the outer circumference of the small pipe and connected to the movable bracket 5, located directly in the center of the movable bracket 5. The magnetic rollers 4 are tightly attached to the outer circumference of the small pipe and can roll along the outer circumference of the small pipe 2 to complete the scanning process. The scanning path is recorded by the position sensor 6 and transmitted to the computer. During the scanning process, the center of the position sensor 6 and the center of the probe 12 are in the same normal plane of the small pipe.

[0032] like Figure 4As shown, the guide limit mechanism III includes: a vertical limit column 1 7, one end of which is connected to the movable bracket 5 and the other end to the radial limit column 8; the travel range of the vertical limit column 7 is 50 mm, and the movable bracket 5 can slide in the vertical direction. A radial limit column 8, one end of which is connected to the vertical limit column 1 7 and the other end to the vertical limit column 2 9; the travel range of the radial limit column 8 is 150 mm, and it can slide in the radial direction of the small pipe. A vertical limit column 2 9, one end of which is connected to the radial limit column 8 and the other end to the clamp 10; the travel range of the vertical limit column 2 9 is 50 mm, and it can slide in the vertical direction. The connection between the limit columns is bolt connection, and the travel range can be modified according to actual conditions. The guide limit mechanism can control the sliding of the movable bracket 5 and the clamp 10 in the travel direction according to the height difference between the plate 1 and the small pipe 2, and adaptively adjust the height of the rotating suction roller 4 and the probe 12.

[0033] like Figure 5 As shown, the probe and clamping mechanism IV consists of a clamp 10 connected at one end to a vertical limit column 29 by bolts, while the other end clamps a wedge 11 via two rotating shafts fixed to the clamp 10. Probe 12 is bolted to wedge 11. Wedge 11 can be rotated about the rotating shaft according to the actual small pipe to adjust and set the probe position, maintaining the relative distance and angle between the probe and the small pipe fillet weld during scanning. Probe 12 can be connected to an external instrument via cable 13. Wedge 11 and probe 12 are generally combined. Common wedge models are N60S and N55S, and the corresponding probes are recommended to be 10L16 and 5L32. Other wedges and probes that meet standards and testing requirements can also be used. The OmniScan MX2 can be used as an external instrument.

[0034] When performing phased array ultrasonic testing on the fillet welds of the inserted small pipe corner joints of pressure vessels, the sensitivity should be set first: the wedge 11 is placed on the testing surface of the comparison test block to ensure that the magnetic roller 4 is in close contact with the small pipe of the comparison test block and is tangent to the small pipe. The appropriate probe and wedge are selected based on the thickness of the test block plate and the pipe thickness. The guide limit mechanism is adjusted to calibrate the sensitivity of the selected phased array detector and phased array probe according to the nature, defect size data and defect location data of the known defects in the plate. The calibrated depth (or sound path) range should at least include the depth (sound path) range to be covered by the test. The reference reflectors used for calibration are generally no less than three different depth points.

[0035] The specific process, detection standard and evaluation standard of the phased array detection of the fillet weld of the corner joint of the plug-in small nozzle of the pressure vessel shall comply with the provisions of NB / T47013.15, including system debugging, sensitivity setting, division of the detection area, detection of the base material, surface treatment, setting of the scanning reference line and the like. During scanning, the suction roller is moved to ensure that the movement track of the probe is consistent with the reference line, the deviation is not greater than 5%, and the relative distance and the relative angle of the probe to the fillet weld of the small nozzle remain unchanged.

[0036] It is recommended to adopt the longitudinal vertical scanning combined with electronic scanning, the electronic scanning adopts fan scanning, and the display mode can be selected as sound path display or geometric structure display imaging.

[0037] The detection image is generally S type, A type, B type, C type and C type display, and the appropriate display mode can be selected according to the requirement, the detection of the nozzle corner joint shall be displayed in the defect state in the modeling structure. The position information shall be displayed in the image display, and the angle information shall be displayed during the fixed-point detection.

[0038] During the analysis of the data, the various displays are combined with the material of the detected object, the structure and the manufacturing characteristics to make comprehensive judgment.

[0039] The above is only the preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content into equivalent embodiments with equivalent changes, but any simple modification, equivalent change and modification made on the basis of the technical essence of the present application to the above embodiments shall still fall within the protection scope of the present application.

Claims

1. A phased array detection device for corner joints, characterized in that: include: A pressure vessel insertable small pipe (I), a scanning mechanism (II), a guide and limit mechanism (III) and a probe and clamping mechanism (IV); the scanning mechanism (II) is arranged on the outer circumference of the pressure vessel insertable small pipe (I), and is adsorbed on the outer circumference of the small pipe by a magnetic roller and performs rotational scanning; the guide and limit mechanism (III) is connected to the scanning mechanism (II) at one end and to the probe and clamping mechanism (IV) at the other end, and the probe is connected to an external instrument via a cable.

2. The phased array detection device for corner joints according to claim 1, characterized in that: The pressure vessel insert type small pipe (I) is connected by a flat plate (1) and a small pipe (2) through a fillet weld (3); the flat plate (1) and the small pipe (2) are made of carbon steel or low alloy steel, the nominal diameter D of the small pipe (2) should meet 50mm≥D≥20mm, and the wall thickness t should meet 6mm≥t≥2.5mm; the welding structure adopted by the fillet weld (3) is an insert type, and the formed weld joint is a butt joint.

3. The phased array detection device for corner joints according to claim 1, characterized in that: The scanning mechanism (II) is fixed to the movable bracket (5) by two magnetic rollers (4) through a threaded connection. The position sensor (6) is tangent to the outer circumference of the small pipe, connected to the movable bracket (5), and located in the middle of the movable bracket (5); the magnetic roller (4) is closely attached to and tangent to the outer circumference of the small pipe (2) and can roll along the outer circumference of the small pipe (2); during the scanning process, the center of the position sensor (6) and the center of the probe (12) are on the same normal plane of the small pipe.

4. A phased array detection device for corner joints according to claim 1 or 2, characterized in that: The guide limit mechanism (III) is connected by a vertical limit column 1 (7), a radial limit column (8) and a vertical limit column 2 (9) through screws and folding plates; The vertical limiting column 1 (7) is connected to the movable bracket (5) at one end and to the radial limiting column (8) at the other end; the movable bracket (5) can slide in the vertical direction and thereby drive the vertical limiting column 1 to move in the vertical direction; The radial limiting column (8) is connected to the vertical limiting column 1 (7) at one end and to the vertical limiting column 2 (9) at the other end; the radial limiting column (8) slides along the radial direction of the small pipe with the help of the vertical limiting column 1; The second vertical limiting column (9) is connected to the radial limiting column (8) at one end and to the clamp (10) at the other end; the second vertical limiting column (9) slides in the vertical direction with the help of the radial limiting column (8) and the first vertical limiting column (7).

5. The phased array detection device for corner joints according to claim 1, characterized in that: The clamping mechanism (IV) is composed of a clamp (10) having one end connected to the second vertical limit column (9) by a thread, and the other end clamping a wedge (11) through two rotating shafts provided on the clamp; the probe (12) is fixed to the wedge (11) by a screw.

6. The phased array detection device for corner joints according to claim 3, characterized in that: The two magnetic rollers (4) have the same specifications, the movable bracket (5) has a symmetrical structure, and a "V"-shaped cross section, and the two magnetic rollers (4) are respectively arranged at the two ends of the movable bracket (5).

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