An ultrasonic phased array testing device for detecting thin-walled tubes

Abstract

This utility model discloses an ultrasonic phased array testing device for testing thin-walled tubes in the field of ultrasonic testing technology. The device includes: a support frame surrounding the outer circumference of the thin-walled tube; a testing component slidably mounted on a track of the support frame, capable of moving along the track to scan the thin-walled tube circumferentially, the testing component including a mounting base and a phased array probe embedded in the inner surface of the mounting base; an airbag assembly including an annular bladder fixed to the inner surface of the mounting base and surrounding the phased array probe, the annular bladder, when inflated, abutting against the thin-walled tube to form a sealed measurement space between the mounting base and the thin-walled tube; and a gas filling assembly. This device forms a sealed measurement space between the mounting base and the thin-walled tube through the airbag assembly, and, in conjunction with the gas filling assembly, injects ultrasonic testing gas into the sealed measurement space, effectively reducing acoustic impedance mismatch and achieving efficient transmission of ultrasonic waves.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic testing technology, specifically to an ultrasonic phased array testing device for testing thin-walled tubes. Background Technology

[0002] Ultrasonic phased array testing technology can be used to detect internal defects in thin-walled tubular components with high precision and reliability requirements. In actual testing, because ultrasonic waves attenuate greatly in air, they cannot effectively penetrate the walls of metal or other materials. Therefore, it is necessary to eliminate the air gap between the phased array probe and the surface of the workpiece being inspected and establish an effective acoustic coupling channel.

[0003] Currently, the mainstream coupling solutions in the industry are divided into two categories: one is liquid / paste coupling agent, which achieves sound energy transmission by filling the tiny gap between the probe and the tube wall; the other is gas film coupling solution, which uses mixed gas to form a high acoustic impedance gas film to replace liquid for coupling.

[0004] Traditional air-film coupling often uses open nozzles to directly inject mixed gas into the gap between the probe and the tube wall without setting an effective sealing structure. It requires a continuous high-pressure gas supply, which not only wastes the coupling medium, but also causes fluctuations in air film thickness due to unstable airflow, resulting in fluctuating ultrasonic transmission efficiency and increased quantitative error of defects.

[0005] To address these issues, an ultrasonic phased array testing device for detecting thin-walled tubes is provided. Utility Model Content

[0006] The purpose of this invention is to provide an ultrasonic phased array detection device for detecting thin-walled tubes, which solves the problem that existing gas film coupling devices lack an effective sealing structure, have poor airflow stability, and result in unsatisfactory detection accuracy.

[0007] This utility model achieves the above objectives through the following technical solutions: An ultrasonic phased array testing device for detecting thin-walled tubes includes: A support frame is provided around the outer periphery of the thin-walled tube; The detection component is slidably mounted on the track of the support frame and can move along the track to scan the thin-walled tube circumferentially. The detection component includes a mounting base and a phased array probe embedded in the inner side of the mounting base. An airbag assembly, comprising an annular bladder fixedly disposed on the inner side of the mounting base and surrounding the phased array probe, wherein the annular bladder, when inflated, abuts against a thin-walled tube to form a sealed measurement space between the mounting base and the thin-walled tube. A gas filling assembly, disposed on the mounting base, is used to inject ultrasonic testing gas into the sealed measurement space.

[0008] As a further optimization of this utility model, the support frame is formed by fixing and splicing two half-frames, and each half-frame includes a lower ring.

[0009] As a further optimization of this utility model, a first adjusting rod is fixedly provided on the outer side of the mounting base, and a slider is slidably sleeved on the first adjusting rod. The side of the slider is provided with fasteners for locking the two together; the slider is slidably disposed at the bottom of the lower ring body.

[0010] As a further optimization of this utility model, the gas filling assembly includes an outlet pipe and an inlet pipe located on both sides of the phased array probe. The outer end of the inlet pipe is connected to an air pump and a gas storage tank in sequence. The inner ends of both the outlet pipe and the inlet pipe extend into the sealed measurement space, and both are equipped with solenoid valves.

[0011] As a further optimization of this utility model, the airbag assembly also includes a compression bladder and a connecting tube for connecting the compression bladder and the annular bladder; the compression bladder is disposed in the limiting sleeve at the top of the mounting base.

[0012] As a further optimization of this utility model, it also includes a compression mechanism disposed on the mounting base and corresponding to the compression bladder; the compression mechanism includes a fixed base and a movable rod movably disposed through the fixed base, one end of the movable rod is fixedly provided with a pressure plate, the other end is fixedly provided with a first wedge block, and a spring is sleeved on the movable rod between the first wedge block and the fixed base.

[0013] As a further optimization of this utility model, the semi-frame also includes an upper ring body and a plurality of fixing plates for fixing the upper ring body and the lower ring body; the inner side of the upper ring body is provided with a plurality of second wedge blocks evenly distributed in the circumferential direction, and the second wedge blocks cooperate with the first wedge blocks to apply pressure to the compression bladder.

[0014] As a further optimization of this utility model, a second adjusting rod is fixedly provided on the side of the second wedge block away from the wedge surface. The second adjusting rod is radially inserted into the upper ring body, and the top of the upper ring body is provided with fasteners for locking the two together.

[0015] The beneficial effects of this utility model are as follows: 1. This utility model forms a sealed measurement space between the mounting base and the thin-walled tube by using an airbag assembly. In conjunction with the gas filling assembly, ultrasonic detection gas is injected into the sealed measurement space to form an acoustic coupling medium layer between the phased array probe and the thin-walled tube. This effectively reduces acoustic impedance mismatch, achieves efficient transmission of ultrasonic waves, and enables clean and accurate ultrasonic detection.

[0016] 2. This utility model achieves automatic switching of the state of the annular bladder during the circumferential rotation of the detection component through the cooperation of the second wedge block and the extrusion mechanism, and the rapid inflation and deflation of the annular bladder, thereby improving the smoothness of the circumferential movement of the detection component and the efficiency of operation. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the detection component and its components of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the detection component and its various parts according to the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the airbag assembly and compression mechanism of this utility model; Figure 5 This is a schematic diagram of the support frame structure of this utility model.

[0018] In the picture: 1. Support frame; 101. Upper ring body; 102. Lower ring body; 103. Fixing plate; 104. Second adjusting rod; 105. Second wedge block; 2. Detection assembly; 201. Mounting base; 202. Phased array probe; 203. First adjusting rod; 204. Slider; 205. Limiting sleeve; 3. Airbag assembly; 301. Annular airbag body; 302. Connecting pipe; 303. Compression airbag body; 4. Compression mechanism; 401. Fixing base; 402. Movable rod; 403. Pressure plate; 404. First wedge block; 405. Spring; 5. Gas filling assembly; 501. Air outlet pipe; 502. Air inlet pipe; 503. Air pump; 504. Gas storage tank. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Example 1 To address the issue of existing air-film coupling systems lacking an effective sealing structure, resulting in poor airflow stability and suboptimal detection accuracy, please refer to... Figures 1-5 This utility model provides an ultrasonic phased array testing device for detecting thin-walled tubes, comprising: Support frame 1 is arranged around the outer periphery of the thin-walled tube. Support frame 1 is composed of two half-frames fixedly spliced ​​together. The half-frame includes a lower ring body 102. The detection component 2 is slidably mounted on the track of the support frame 1 and can move along the track to scan the thin-walled tube circumferentially. The detection component 2 includes a mounting base 201 and a phased array probe 202 embedded in the inner side of the mounting base 201. The airbag assembly 3 includes an annular bladder 301 fixed on the inner side of the mounting base 201 and surrounding the phased array probe 202. When inflated, the annular bladder 301 abuts against the thin-walled tube to form a sealed measurement space between the mounting base 201 and the thin-walled tube. The gas filling component 5, located on the mounting base 201, is used to inject ultrasonic testing gas into the sealed measurement space. The ultrasonic testing gas can be a mixture of high-pressure clean gas (such as nitrogen or dry air) and trace amounts of volatile coupling media (such as isopropanol or acetone vapor).

[0021] The mounting base 201 has a first adjusting rod 203 fixedly mounted on its outer surface. A slider 204 is slidably mounted on the first adjusting rod 203. Fasteners for locking the two are provided on the side of the slider 204. The first adjusting rod 203 can slide radially through the slider 204, forming a radial adjustment mechanism. This structure can adjust the distance between the phased array probe 202 and the thin-walled tube, thereby adapting to the detection requirements of thin-walled tubes with different diameters. During adjustment, the fasteners on the side of the slider 204 are first loosened, allowing the first adjusting rod 203 to move freely radially within the guide hole of the slider 204. Then, the first adjusting rod 203 is pushed to drive the mounting base 201 and the phased array probe 202 to move radially as a whole until a suitable detection gap is formed between the phased array probe 202 and the thin-walled tube. Finally, the fasteners are tightened again to lock the first adjusting rod 203 in the current position, completing the tube diameter adaptation.

[0022] The slider 204 is slidably positioned at the bottom of the lower ring body 102. Specifically, an annular groove is provided on the lower ring body 102, and the slider 204 is embedded in the annular groove and slides circumferentially, achieving smooth circumferential movement of the detection component 2. The circumferential movement of the slider 204 can be manual or electric. When electric, a gear ring is fixedly provided on the outer circumference of the lower ring body 102, and a micro gear motor is integrated on the slider 204. The automatic circumferential positioning of the detection component 2 is achieved through the gear ring engagement. When manual, the detection component 2 can be directly pushed, causing the slider 204 to slide along the annular groove at the bottom of the lower ring body 102 to the target detection angle. To improve positioning accuracy and prevent shaking during detection, a magnetic positioning structure is provided between the slider 204 and the annular groove, achieving stable locking of the slider 204 through magnetic attraction.

[0023] like Figure 3As shown, the gas filling assembly 5 includes an outlet pipe 501 and an inlet pipe 502 located on both sides of the phased array probe 202. The outer end of the inlet pipe 502 is connected to an air pump 503 and a gas storage tank 504 in sequence. The inner ends of both the outlet pipe 501 and the inlet pipe 502 extend into the sealed measurement space, and both pipes are equipped with solenoid valves to control the filling and discharging of gas. When using the gas filling assembly 5, first open the solenoid valves on the outlet pipe 501 and the inlet pipe 502, start the air pump 503, and inject the ultrasonic detection gas in the gas storage tank 504 into the sealed measurement space through the inlet pipe 502. The air in the original sealed measurement space is discharged through the outlet pipe 501. Then close the solenoid valve on the outlet pipe 501, and continue to inject ultrasonic detection gas into the sealed measurement space until the space is full. After maintaining the pressure inside the cavity, ultrasonic detection can begin.

[0024] In use, the thin-walled tube to be tested is first inserted into the central area of ​​the support frame 1 and kept in a centered position. The airbag inflation and deflation system injects gas into the annular bladder 301, causing it to expand radially and evenly press against the outer wall of the thin-walled tube, thereby forming a sealed measurement space between the mounting base 201 and the thin-walled tube. After sealing, the gas filling component 5 injects ultrasonic testing gas into the sealed measurement space to form an acoustic coupling medium layer between the phased array probe 202 and the thin-walled tube, effectively reducing acoustic impedance mismatch and achieving efficient transmission of ultrasonic waves. Then, the phased array probe 202 is used for detection. After the detection at this position is completed, the airbag component 3 is depressurized, and the detection component 2 slides to the next angle. The above actions are repeated to achieve full circumferential scanning.

[0025] Example 2 Based on Example 1, in order to achieve rapid inflation and deflation of the annular capsule 301 and improve detection efficiency, such as Figures 3-5 As shown, the airbag assembly 3 also includes a compression bladder 303 and a connecting pipe 302 for connecting the compression bladder 303 and the annular bladder 301; the compression bladder 303 is disposed in the limiting sleeve 205 at the top of the mounting base 201.

[0026] It also includes a compression mechanism 4 disposed on the mounting base 201 and corresponding to the compression bladder 303; the compression mechanism 4 includes a fixed base 401 and a movable rod 402 movably passing through the fixed base 401. One end of the movable rod 402 is fixedly provided with a pressure plate 403, which is fixedly connected to the compression bladder 303, and the other end is fixedly provided with a first wedge block 404. A spring 405 is sleeved on the movable rod 402 between the first wedge block 404 and the fixed base 401.

[0027] The semi-frame also includes an upper ring body 101 and a plurality of fixing plates 103 for fixing the upper ring body 101 and the lower ring body 102. The axes of the upper ring body 101 and the lower ring body 102 coincide with the axis of the thin-walled tube. The fixing plates 103 are evenly spaced along the circumference. The inner side of the upper ring body 101 is provided with a plurality of second wedge blocks 105 evenly distributed along the circumference. The second wedge blocks 105 cooperate with the first wedge blocks 404 to apply pressure to the compression bladder 303.

[0028] To match the radial adjustment function of the phased array probe 202, a second adjusting rod 104 is fixedly provided on the side of the second wedge block 105 opposite to the wedge surface. The second adjusting rod 104 is radially inserted into the upper ring body 101, and the top of the upper ring body 101 is provided with fasteners for locking the two together. By adjusting the radial position of the second adjusting rod 104, the relative distance between the second wedge block 105 and the first wedge block 404 can be adjusted to adapt to the changes in the distance between the phased array probe 202 and the thin-walled tube during the detection of thin-walled tubes of different diameters, ensuring the reliable operation of the extrusion mechanism 4.

[0029] When the detection component 2 reaches the target detection position, the second adjusting rod 104 on the upper ring body 101 contacts the first wedge block 404 through the second wedge block 105 fixed at the inner end and pushes the movable rod 402 to move towards the squeezing bladder 303. At this time, the pressure plate 403 squeezes the squeezing bladder 303, causing the annular bladder 301 to expand and fit tightly with the thin-walled tube to form a sealed measurement space. When the detection component 2 needs to rotate circumferentially to the next detection position, the second adjusting rod 104 drives the second wedge block 105 to disengage from the first wedge block 404. Under the action of the spring 405, the movable rod 402 retracts, the pressure plate 403 releases the squeezing of the squeezing bladder 303, the annular bladder 301 contracts and separates from the thin-walled tube, facilitating the smooth movement of the detection component 2.

[0030] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. An ultrasonic phased array testing device for detecting thin-walled tubes, characterized in that, include: Support frame (1) is arranged around the outer periphery of the thin-walled tube; The detection component (2) is slidably disposed on the track of the support frame (1) and can move along the track to scan the thin-walled tube circumferentially. The detection component (2) includes a mounting base (201) and a phased array probe (202) embedded in the inner side of the mounting base (201). The airbag assembly (3) includes an annular bladder (301) fixed on the inner side of the mounting base (201) and surrounding the phased array probe (202). The annular bladder (301) abuts against the thin-walled tube in the inflated state to form a sealed measurement space between the mounting base (201) and the thin-walled tube. A gas filling assembly (5), disposed on the mounting base (201), is used to inject ultrasonic testing gas into the sealed measurement space.

2. The ultrasonic phased array testing device for detecting thin-walled tubes according to claim 1, characterized in that, The support frame (1) is formed by two half-frames fixedly spliced ​​together, and the half-frame includes a lower ring (102).

3. The ultrasonic phased array testing device for detecting thin-walled tubes according to claim 2, characterized in that, A first adjusting rod (203) is fixedly provided on the outer side of the mounting base (201), and a slider (204) is slidably sleeved on the first adjusting rod (203). The side of the slider (204) is provided with fasteners for locking the two together. The slider (204) is slidably disposed at the bottom of the lower ring body (102).

4. The ultrasonic phased array testing device for detecting thin-walled tubes according to claim 1, characterized in that, The gas filling assembly (5) includes an outlet pipe (501) and an inlet pipe (502) located on both sides of the phased array probe (202). The outer end of the inlet pipe (502) is connected to an air pump (503) and a gas storage tank (504) in sequence. The inner ends of the air outlet pipe (501) and the air inlet pipe (502) both extend into the sealed measurement space, and both of them are equipped with solenoid valves.

5. The ultrasonic phased array testing device for detecting thin-walled tubes according to claim 2, characterized in that, The airbag assembly (3) also includes a compression bladder (303) and a connecting tube (302) for connecting the compression bladder (303) and the annular bladder (301). The compression bladder (303) is located inside the limiting sleeve (205) at the top of the mounting base (201).

6. The ultrasonic phased array detection device for detecting thin-walled tubes according to claim 5, characterized in that, It also includes a compression mechanism (4) disposed on the mounting base (201) and corresponding to the compression bladder (303); The extrusion mechanism (4) includes a fixed base (401) and a movable rod (402) that is movably disposed on the fixed base (401). One end of the movable rod (402) is fixedly provided with a pressure plate (403), and the other end is fixedly provided with a first wedge block (404). A spring (405) is sleeved on the movable rod (402) between the first wedge block (404) and the fixed base (401).

7. The ultrasonic phased array testing device for detecting thin-walled tubes according to claim 6, characterized in that, The semi-frame also includes an upper ring (101) and a plurality of fixing plates (103) for fixing the upper ring (101) and the lower ring (102). The inner side of the upper ring body (101) is provided with a plurality of second wedge blocks (105) evenly distributed in the circumferential direction. The second wedge blocks (105) cooperate with the first wedge block (404) to apply pressure to the compression bladder (303).

8. The ultrasonic phased array testing device for detecting thin-walled tubes according to claim 7, characterized in that, The second wedge block (105) is fixedly provided with a second adjusting rod (104) on the side away from the wedge surface. The second adjusting rod (104) is radially inserted into the upper ring body (101), and the top of the upper ring body (101) is provided with fasteners for locking the two together.

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