A device and method for testing the weld strength of an APU diffuser

Abstract

The present invention discloses a device and method for testing the weld strength of an APU diffuser, belonging to the technical field of physical testing equipment. The device for testing the weld strength of an APU diffuser comprises a housing with an upward opening. A rotatable bearing roller is provided at the bottom inner side of the housing. A diffuser is mounted above the bearing roller. The diffuser is welded to a conical cylinder by a drainage sleeve to form a second weld. Through the design of the housing, drive assembly, and probe, the present invention performs ultrasonic deep flaw detection on the welding positions of the blades in the diffuser and the welds of the diffuser body. A flowing liquid medium is introduced into the compensation space to compensate for the rough surface of the weld. The compensation space is used to temporarily cover the weld to be inspected. A small amount of liquid medium can fill the compensation space. The entrainment effect of the liquid medium flowing out of the compensation space is utilized to reduce the influence of solid impurities and bubbles on the inspection results.

Description

Technical Field

[0001] The present invention belongs to the technical field of physical testing equipment, and in particular relates to a device and method for testing the weld strength of an APU diffuser. Background Art

[0002] The APU core is a small turbine engine, which is a power unit in addition to the aircraft's main engine. Its function is to independently provide power and compressed air to the aircraft. The APU diffuser is installed at the compressor outlet and connected to the combustion chamber. Blades are welded inside the diffuser to guide the airflow to decelerate and diffuse smoothly. The welds of the APU diffuser are usually located at key positions such as its compressor connection, combustion chamber connection and blade seams.

[0003] Existing weld strength testing methods include destructive tests such as tensile and bend tests, as well as non-destructive tests such as ultrasonic testing, eddy current testing, and magnetic flux leakage testing. Non-destructive testing is the preferred method for weld inspection in the aviation industry due to its non-destructive nature and high precision. However, during ultrasonic testing, the probe needs to be attached to a flat surface for inspection. However, diffuser welds are mostly right-angled welds and arc welds, so the probe's fit between the weld surface and the weld is poor, affecting inspection accuracy. Therefore, a device and method for APU diffuser weld strength testing are provided. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a device and method for testing the weld strength of an APU diffuser.

[0005] The technical solutions adopted to solve the above technical problems are:

[0006] A device for testing the weld strength of an APU diffuser comprises: a box body, the opening of the box body is upward, a rotatable bearing roller is provided at the bottom inner side of the box body, a diffuser is mounted above the bearing roller, the diffuser is welded by a drainage sleeve and a cone to form a second weld, and a plurality of blades are welded on the inner diffusion wall of the cone near the drainage sleeve to form a plurality of first welds; a driving assembly comprises a linear slide, the linear slide is fixed at the opening position at the top end of the box body, the linear slide is arranged parallel to the axis of the drainage sleeve, a telescopic arm is connected to the linear slide through a swing joint, a rotating joint 1 is installed at the free end of the telescopic arm, and a rotating joint 2 is installed at the end of the rotating shaft of the rotating joint 1; a probe comprises a shell, the shell is installed at the end of the rotating shaft of the rotating joint 2, an ultrasonic transceiver is embedded in the lower part of the shell, the shell is provided with end shells on both sides of the ultrasonic transceiver, a spray hole is opened at the bottom of the end shell, and a liquid supply device is provided at the top of the end shell.

[0007] Furthermore, the blade has blade surface 1, end surface 1, end surface 2 and blade surface 2, and the weld seam 1 is formed between the blade surface 1, end surface 1, end surface 2 and blade surface 2 and the inner diffusion wall of the cone, and the annular end surface 1 of the cone and the annular end surface 2 of the drainage sleeve are welded to form weld seam 2.

[0008] Through the above technical solution, due to the annular array arrangement of the blades, multiple independent welds 1 are formed, and a complete annular weld 2 is formed at the welding point between the cone and the drainage sleeve.

[0009] Furthermore, the outer shell and the end shell are provided with rounded chamfers on the long sides of the bottom, and the ultrasonic transceiver head is provided with an inclined end surface at the rounded chamfer, and the inclined end surface forms an angle of forty-five degrees with the horizontal plane.

[0010] Through the above technical solution, the outer shell and end shell are optimized. At the embedded position of the ultrasonic transceiver, a larger space is formed by setting a round chamfer to facilitate the entry and flow of liquid media. In addition, the forty-five-degree inclined end face allows the sound waves to penetrate deep into the weld to detect deep structural damage, fully utilizing the deep flaw detection characteristics of ultrasound to ensure the weld detection effect.

[0011] Furthermore, a baffle is installed on the side of the end shell away from the outer shell, and a notch is opened at the corresponding round chamfer of the baffle. The baffle adopts a deformable elastic plate structure, and a compensation space is formed between the two baffles. The spray hole is located in the compensation space.

[0012] Through the above technical solution, the baffle blocks the gap on one side of the end shell, so that the liquid medium in the compensation space can stay longer to ensure the coupling effect. The baffle can preferentially sweep over the weld for pre-cleaning to avoid solid debris on the surface interfering with the weld detection results.

[0013] Furthermore, a lining plate is installed on the vertical side wall of the shell, and a vertically extending straight groove is opened on the side of the lining plate facing away from the shell, and the compensation space is connected with the outside air through the straight groove.

[0014] Through the above technical solution, the lining plate blocks the gap between the shell and the blade, and the lining plate made of elastic material fits the curved blade to prevent the liquid medium newly entering the compensation space from directly overflowing, thereby ensuring the coupling effect. In addition, the residual solid impurities and bubbles that have not been thoroughly cleaned will be carried away and discharged from the straight groove position by the old liquid medium as the liquid medium continues to flow in, thereby ensuring accurate detection.

[0015] Furthermore, the liquid supplier has a pump and a hose, the outlet end of the pump is connected and fixed to the end shell, and the hose is installed at the inlet end of the pump and communicates with the external liquid supply equipment.

[0016] Through the above technical solution, a continuously supplied liquid medium is used to fill the compensation space, and only the part of the weld to be inspected is immersed in the liquid medium. The ultrasonic transceiver head contacts the surface of the part through the liquid medium, and coupling is completed using less liquid medium, which facilitates the control of the amount and cleanliness of the liquid medium.

[0017] Furthermore, a liquid medium is built into the box body, the liquid level of the liquid medium is higher than the lowest weld seam 1 in the diffuser, and the liquid supplier is connected to the liquid medium in the box body through a pipeline.

[0018] Through the above technical solution, the weld to be inspected is directly immersed in the liquid medium, and the coupling effect of the ultrasonic transceiver is good, but it requires a large amount of liquid medium to be input at a time, and an additional circulation purification system must be equipped, which is costly.

[0019] Furthermore, the carrying roller includes a drainage sleeve support roller and a cone support roller, the circumferential outer wall of the drainage sleeve support roller matches the circumferential outer wall of the drainage sleeve, and the cone support roller matches the outer wall of the cone away from the drainage sleeve.

[0020] Through the above technical solution, a specific configuration of a carrying roller is disclosed, in which the free end of the drainage sleeve is turned outward in a semi-circular shape, and the drainage sleeve support roller is in a frustum shape as a whole. An inward concave arc is provided on the circumferential outer wall to adapt to the outer edge contour of the drainage sleeve, and the drainage sleeve can be squeezed toward the cone. The outer diameter of the free end of the cone is gradually enlarged, and the left half of the cone support roller is in a frustum shape to adapt to the circumferential outer wall of the cone. The accompanying part of the cone support roller is provided with a stepped convex edge, which can be blocked at the vertical end face of the right end of the cone. The drainage sleeve support roller and the cone support roller limit the diffuser from both ends to prevent the diffuser from axial movement.

[0021] Furthermore, the lower end of the end shell adopts an elastically deformable structure, and the end shell can be squeezed and collapsed when contacting the inner diffusion wall of the cone.

[0022] Through the above technical solution, in order to adapt to the curvature of the inner diffusion wall, when the probe detects the weld 1 at the end face 1 and the end face 2, the ultrasonic transceiver head is close to the weld 1, which will cause the end shells on both sides of the outer shell to contact the inner diffusion wall. The end shells are designed to be elastic materials, such as rubber materials or other materials that can be deformed under pressure and automatically reset. This can ensure that the ultrasonic transceiver head is sufficiently close to the weld 1 at the end face 1 and the end face 2 for detection without causing wear to the inner diffusion wall.

[0023] A method for testing the weld strength of an APU diffuser comprises the following steps:

[0024] Preparation stage 1: hoist the diffuser into the box and set it on the drainage sleeve support roller and the cone support roller. The drainage sleeve support roller and the cone support roller drive the diffuser to rotate around its own axis so that the lowest blade is in a vertical state;

[0025] In the second preparation phase, the swing joint rotates to swing the vertical telescopic arm toward the diffuser until it becomes horizontal. The linear slide drives the swing joint to translate and insert it into the drainage sleeve, so that the ultrasonic transceiver head is located at the intersection of blade surface 1 and end surface 2. Rotating joints 1 and 2 work to make the ultrasonic transceiver head face weld 1 between blade surface 1 and inner diffuser wall. The swing joint rotates to cause the horizontal telescopic arm to continue swinging until the center line of the oblique end surface of the ultrasonic transceiver head is parallel to weld 1 between blade surface 1 and inner diffuser wall.

[0026] In the first stage of weld detection, the telescopic arm is extended to move the ultrasonic transceiver head along the weld between the blade surface and the inner diffusion wall until the ultrasonic transceiver head passes the junction between the blade surface and the end face.

[0027] In the second stage of weld seam 1 detection, the first rotary joint and the second rotary joint work so that the ultrasonic transceiver head faces the weld seam 1 between the end face 1 and the inner diffusion wall;

[0028] In the third stage of weld seam 1 inspection, rotating joints 1 and 2 are operated again so that the ultrasonic transceiver is facing weld seam 1 between blade surface 1 and the inner diffuser wall. The telescopic arm is shortened until the ultrasonic transceiver passes the intersection of blade surface 1 and end surface 2. Rotating joints 1 and 2 are then operated so that the ultrasonic transceiver is facing weld seam 1 between end surface 2 and the inner diffuser wall.

[0029] In the fourth stage of weld seam 1 inspection, the carrier roller operates to rotate the diffuser by the distance of a drive assembly. Rotary joints 1 and 2 operate to position the ultrasonic transceiver head directly toward weld seam 1 between blade surface 2 and the inner diffuser wall. The telescopic arm extends to move the ultrasonic transceiver head along weld seam 1 between blade surface 2 and the inner diffuser wall until the ultrasonic transceiver head passes the junction between blade surface 2 and end surface 1.

[0030] During the second weld inspection phase, the telescopic arm shortens until the ultrasonic transceiver passes the junction of blade surface 2 and end surface 2. Rotary joints 1 and 2 operate to position the ultrasonic transceiver directly against weld 2 between the cone and the drainage sleeve. The supporting rollers rotate the diffuser until the adjacent blades are in a vertical position.

[0031] Enter the weld seam 1 detection phase 1 again until the ultrasonic transceiver head scans the entire length of weld seam 1 and weld seam 2;

[0032] During the weld seam one and weld seam two inspection stages, the end shell continuously injects liquid medium into the compensation space through the nozzle hole, causing the original liquid and gas in the compensation space to overflow through the straight groove.

[0033] The beneficial effects of the present invention are as follows:

[0034] (1) The present invention performs ultrasonic deep flaw detection on the welding position of the blades in the diffuser and the weld of the diffuser body through the design of the housing, drive assembly and probe. A flowing liquid medium is introduced into the compensation space to compensate for the rough surface of the weld. The compensation space is used to temporarily cover the weld to be inspected. A small amount of liquid medium can fill the compensation space. The entrainment effect of the liquid medium flowing out of the compensation space is utilized to reduce the influence of solid impurities and bubbles on the inspection results.

[0035] (2) Through the optimization of the probe, the present invention aims at the weld between two parts at a right angle, not perpendicular to the surface of the diffuser part, and uses the side walls of the parts for clamping and guidance, thereby optimizing the extension direction of the ultrasonic wave and performing flaw detection at the deep position of the weld, giving full play to the advantages of ultrasonic wave in deep flaw detection;

[0036] (3) The present invention optimizes the probe detection path. When inspecting multiple independent blade welds and an entire annular diffuser shell weld, the probe movement path is optimized so that the diffuser rotates one circle to complete the complete detection of all welds. Short welds can also be inspected to eliminate the blind spots of automatic inspection. Long welds can be inspected reciprocally to avoid errors caused by the inspection direction and ensure the inspection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the structure of the present invention in a combined state with a diffuser;

[0038] Figure 2 It is a structural schematic diagram of the present invention;

[0039] Figure 3 It is a structural diagram of a diffuser adapted by the present invention;

[0040] Figure 4 It is a schematic diagram of the structure between the driving component and the probe of the present invention;

[0041] Figure 5 It is a schematic structural diagram of the probe and its connected components of the present invention;

[0042] Figure 6 This is a schematic diagram of the state in which the probe of the present invention detects the weld between the blade and the cone. Figure 1 ;

[0043] Figure 7 yes Figure 6 A schematic diagram of the structure from another perspective at point a;

[0044] Figure 8 This is a schematic diagram of the state in which the probe of the present invention detects the weld between the blade and the cone. Figure 2 ;

[0045] Figure 9 This is a schematic diagram of the state in which the probe of the present invention detects the weld between the blade and the cone. Figure 3 ;

[0046] Figure 10 This is a schematic diagram of the state in which the probe of the present invention detects the weld between the blade and the cone. Figure 4 ;

[0047] Figure 11 It is a schematic diagram of the state in which the probe of the present invention detects the second weld between the drainage sleeve and the cone.

[0048] Figure numerals: 1. Box body; 2. Carrying roller; 21. Drainage sleeve support roller; 22. Cone support roller; 3. Drive assembly; 31. Linear slide; 32. Swing joint; 33. Telescopic arm; 34. Rotary joint one; 35. Rotary joint two; 4. Probe; 41. Shell; 42. End shell; 43. Baffle; 44. Nozzle; 45. Liquid feeder; 46. Fillet; 47. Liner; 48. Straight groove; 49. Ultrasonic transceiver; 491. Oblique end face; 5. Diffuser; 51. Cone; 511. Inner diffusion wall; 512. Ring end face one; 52. Blade; 521. Blade surface one; 522. End face one; 523. End face two; 524. Blade surface two; 53. Drainage sleeve; 531. Ring end face two; 54. Weld one; 55. Weld two; 6. Compensation space. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] like Figures 1-11 As shown, this embodiment provides an apparatus for testing the weld strength of an APU diffuser. To address existing weld flaw detection accuracy issues and adapt to diffuser right-angle welds and arc-surface welds, a coupling agent is used to fill the gap between the weld and the probe. However, because the coupling agent is a liquid medium, its inherent fluidity and the need for the probe to move over the weld make it impossible to ensure that the coupling agent always fills the gap between the probe and the weld, which can lead to bubbles or other impurities entering between the probe and the weld. Therefore, a specific configuration is provided to address existing problems.

[0051] Reference Figure 3 、 Figure 6 and Figure 11The diffuser 5 is welded to the guide sleeve 53 and the cone 51 to form a second weld 55. A plurality of blades 52 are welded to the inner diffusion wall 511 of the cone 51 near the guide sleeve 53 to form a plurality of welds 1 54. The blade 52 has a blade surface 1 521, an end surface 1 522, an end surface 2 523 and a blade surface 2 524. The weld 1 54 is formed between the blade surface 1 521, the end surface 1 522, the end surface 2 523 and the blade surface 2 524 and the inner diffusion wall 511 of the cone 51. The annular end surface 1 512 of the cone 51 is welded to the annular end surface 2 531 of the guide sleeve 53 to form a weld 2 55. Because the blades 52 are arranged in an annular array, multiple independent welds 1 54 are formed, while the welding point between the cone 51 and the guide sleeve 53 forms a complete annular weld 2 55.

[0052] To adapt to the existing diffuser 5, set the box 1, refer to Figure 1 The box body 1 opens upwards, and a rotatable carrying roller 2 is provided at the bottom of the inner side of the box body 1, wherein a diffuser 5 is provided above the carrying roller 2. It can be emphasized that the carrying roller 2 includes a drainage sleeve support roller 21 and a cone support roller 22, and, referring to Figure 2 and Figure 3 , take the left end of the accompanying drawing as the left end of the equipment, and the right end of the accompanying drawing as the right end of the equipment, for the convenience of description and understanding, the circumferential outer wall of the drainage sleeve support roller 21 matches the circumferential outer wall of the drainage sleeve 53, because the free end of the drainage sleeve 53 is turned outward in a semi-circular shape, and the drainage sleeve support roller 21 is frustum-shaped as a whole, with an inward concave arc set on the circumferential outer wall to adapt to the outer edge contour of the drainage sleeve 53, and the drainage sleeve 53 can be squeezed toward the direction of the cone 51. At the same time, the cone support roller 22 matches the outer wall of the cone 51 away from the drainage sleeve 53, and the outer diameter of the free end of the cone 51 gradually increases. The left half of the cone support roller 22 is frustum-shaped, which is adapted to the circumferential outer wall of the cone 51, and the right half of the cone support roller 22 is provided with a stepped convex edge, which can be blocked at the vertical end face of the right end of the cone 51. The drainage sleeve support roller 21 and the cone support roller 22 limit the diffuser 5 from both ends to prevent the diffuser 5 from axial movement;

[0053] At the same time, refer to Figure 4 , design a drive component 3, including a linear slide 31, the linear slide 31 is fixed at the top opening position of the box body 1, the linear slide 31 is arranged parallel to the axis of the drainage sleeve 53, the linear slide 31 is connected to a telescopic arm 33 through a swing joint 32, the free end of the telescopic arm 33 is installed with a rotary joint 1 34, and the end of the rotating shaft of the rotary joint 1 34 is installed with a rotary joint 2 35, wherein the rotation axis of the swing joint 32 is arranged horizontally and perpendicular to the axis of the diffuser 5, the telescopic direction of the telescopic arm 33 is parallel to the sliding direction of the linear slide 31, the rotation axis of the rotary joint 1 34 is parallel to the rotation axis of the swing joint 32, and the rotation axis of the rotary joint 2 35 is arranged vertically and perpendicular to the axis of the diffuser 5;

[0054] Reference Figure 5 Regarding the probe 4, it includes a shell 41. The shell 41 is rectangular and is installed at the end of the rotating shaft of the rotating joint 35. It can be driven to rotate to adapt to the extension direction of the weld. An ultrasonic transceiver 49 is embedded in the lower part of the shell 41, which can transmit and receive ultrasonic waves for flaw detection. The shell 41 is provided with end shells 42 on both sides of the ultrasonic transceiver 49. The hollow end shells 42 are for liquid medium to flow, wherein a spray hole 44 is provided at the bottom of the end shell 42, and a liquid feeder 45 is provided at the top of the end shell 42. The liquid feeder 45 fills the liquid medium into the end shell 42 and sprays it out from the spray hole 44 into the gap between the probe 4 and the weld, flushing the bubbles and solid impurities out of the space between the probe 4 and the weld to ensure the accuracy of flaw detection.

[0055] In a further embodiment, the outer shell 41 and the end shell 42 are optimized, referring to Figure 7 , the outer shell 41 and the end shell 42 are both provided with a round chamfer 46 on the long side of the bottom. At the embedded position of the ultrasonic transceiver 49, the setting of the round chamfer 46 forms a larger space for the entry and flow of the liquid medium. In addition, the ultrasonic transceiver 49 is provided with an inclined end surface 491 at the round chamfer 46. The inclined end surface 491 is at a forty-five degree angle to the horizontal plane. When inspecting the weld between two parts connected at right angles, because the welding at this angle will be pre-chamfered, the weld is not perpendicular to the horizontal surfaces of the two parts, but extends along the angle bisector of the angle between the parts. The design of the inclined end surface 491 makes the emission direction of the sound wave parallel to the angle bisector and propagates along the shortest path to the depth of the weld, which can cover the entire range of the weld and make the sound wave penetrate into the weld 54 to detect deep structural damage, making full use of the deep flaw detection characteristics of ultrasonic waves to ensure the weld detection effect.

[0056] In a further embodiment, referring to Figure 5 and Figure 7 A baffle 43 is installed on the side of the end shell 42 away from the outer shell 41. The baffle 43 adopts a deformable elastic plate structure. A compensation space 6 is formed between the two baffles 43. The nozzle 44 is located in the compensation space 6. The baffle 43 blocks the gap on one side of the end shell 42, so that the liquid medium entering the compensation space 6 through the nozzle 44 can stay longer to ensure the coupling effect. What can be optimized is that the baffle 43 is provided with a notch corresponding to the round chamfer 46. The notch is a narrow gap, which improves the deformation ability of the baffle 43 and can deform independently to adapt to the complex surface roughness of the weld. At the same time, the narrow gap leaks less liquid medium, which will not affect the liquid medium filling the compensation space 6. Moreover, the baffle 43 can scan the weld before the ultrasonic transceiver head 49 for pre-cleaning to avoid solid debris on the surface interfering with the weld detection results.

[0057] In a further embodiment, referring to Figure 7 A lining plate 47 is installed on the vertical side wall of the shell 41. The lining plate 47 blocks the gap between the shell 41 and the blade 52, and the lining plate 47 is made of elastic material to fit the curved blade 52 to prevent the new liquid medium entering the compensation space 6 from directly overflowing, thereby ensuring the coupling effect. At the same time, a vertically extending straight groove 48 is opened on the side of the lining plate 47 facing away from the shell 41. The compensation space 6 is connected to the outside air through the straight groove 48. Residual solid impurities and bubbles that have not been thoroughly cleaned will be discharged from the straight groove 48 position as the liquid medium continues to flow in, thereby ensuring accurate detection.

[0058] In a further embodiment, a method for supplying a liquid medium is provided, in which the liquid supply device 45 has a pump and a hose, the outlet end of the pump is connected and fixed to the end shell 42, and the hose is installed at the inlet end of the pump to communicate with the external liquid supply equipment. The compensation space 6 is filled with a continuously supplied liquid medium, and only the inspected part of the weld 54 is immersed in the liquid medium. The ultrasonic transceiver head 49 contacts the surface of the part through the liquid medium, and the coupling is completed using less liquid medium, which facilitates the control of the amount and cleanliness of the liquid medium.

[0059] In a further embodiment, a liquid medium is built into the box body 1, and the liquid level of the liquid medium is higher than the lowest weld 54 in the diffuser 5. The weld 54 to be inspected is directly immersed in the liquid medium. The coupling effect of the ultrasonic transceiver 49 is good. The liquid supplier 45 is connected to the liquid medium in the box body 1 through a pipeline. The liquid medium in the box body 1 can be replenished into the compensation space 6 by itself, and the weld under inspection is cleaned and bubbles are prevented from remaining in the compensation space 6. However, a large amount of liquid medium needs to be input at a single time, and an additional circulation purification system must be equipped to filter the liquid medium, which is costly.

[0060] In a further embodiment, in order to adapt to the curvature of the inner diffusion wall 511, refer to Figure 8 and Figure 9 When the probe detects the weld 1 54 at the end face 1 522 and the end face 2 523, the ultrasonic transceiver head 49 approaches the weld 1 54, which causes the end shells 42 on both sides of the shell 41 to contact the inner diffusion wall 511. The lower end of the end shell 42 adopts a structure that can be elastically deformed. Because the end shell 42 is designed to be an elastic material, such as rubber material or other materials that can be deformed under pressure and automatically reset, the end shell 42 can be squeezed and collapsed when contacting the inner diffusion wall 511 of the cone 51, which can ensure that the ultrasonic transceiver head 49 is sufficiently close to the weld 1 54 at the end face 1 522 and the end face 2 523 for detection, and will not cause wear to the inner diffusion wall 511.

[0061] A method for testing the weld strength of an APU diffuser comprises the following steps:

[0062] Preparation stage 1: The diffuser 5 is hoisted into the box 1 and mounted on the drainage sleeve support roller 21 and the cone support roller 22. The drainage sleeve support roller 21 and the cone support roller 22 drive the diffuser 5 to rotate around its own axis so that the lowest blade 52 is in a vertical state;

[0063] In preparation stage two, the swing joint 32 rotates to swing the vertical telescopic arm 33 toward the diffuser 5 until it becomes horizontal. The linear slide 31 drives the swing joint 32 to translate and insert into the drainage sleeve 53, so that the ultrasonic transceiver head 49 is located at the intersection of the blade surface 1 521 and the end surface 2 523. The rotating joint 1 34 and the rotating joint 2 35 work to make the ultrasonic transceiver head 49 face the weld 1 54 between the blade surface 1 521 and the inner diffuser wall 511. The swing joint 32 rotates to cause the horizontal telescopic arm 33 to continue swinging until the center line of the oblique end surface 491 of the ultrasonic transceiver head 49 is parallel to the weld 1 54 between the blade surface 1 521 and the inner diffuser wall 511.

[0064] In the first stage of weld seam 54 inspection, the telescopic arm 33 is extended to move the ultrasonic transceiver head 49 along the weld seam 54 between the blade surface 521 and the inner diffuser wall 511 until the ultrasonic transceiver head 49 passes over the junction of the blade surface 521 and the end surface 522;

[0065] In the second stage of detecting the weld 1 54 , the rotating joint 1 34 and the rotating joint 2 35 work so that the ultrasonic transceiver 49 faces the weld 1 54 between the end face 1 522 and the inner diffusion wall 511 ;

[0066] In the third stage of weld seam 1 54 inspection, rotating joint 1 34 and rotating joint 2 35 operate again so that the ultrasonic transceiver head 49 faces weld seam 1 54 between blade surface 1 521 and inner diffuser wall 511 . The telescopic arm 33 shortens until the ultrasonic transceiver head 49 passes over the intersection of blade surface 1 521 and end surface 2 523 . Rotating joint 1 34 and rotating joint 2 35 then operate so that the ultrasonic transceiver head 49 faces weld seam 1 54 between end surface 2 523 and inner diffuser wall 511 .

[0067] In the fourth stage of testing the weld seam 1 54 , the carrier roller 2 operates to rotate the diffuser 5 by a distance of the drive assembly 3 . The rotary joint 1 34 and the rotary joint 2 35 operate to position the ultrasonic transceiver 49 directly opposite the weld seam 1 54 between the blade surface 2 524 and the inner diffuser wall 511 . The telescopic arm 33 extends to move the ultrasonic transceiver 49 along the weld seam 1 54 between the blade surface 2 524 and the inner diffuser wall 511 until the ultrasonic transceiver 49 passes over the junction of the blade surface 2 524 and the end surface 1 522 .

[0068] During the weld seam 55 inspection phase, the telescopic arm 33 is shortened until the ultrasonic transceiver head 49 passes over the intersection of the blade surface 524 and the end surface 523. The rotary joint 1 34 and the rotary joint 2 35 operate to position the ultrasonic transceiver head 49 directly opposite the weld seam 55 between the cone 51 and the drainage sleeve 53. The supporting roller 2 operates to rotate the diffuser 5 until the adjacent blades 52 are in a vertical position.

[0069] Entering the first stage of weld seam 1 54 detection again, until the ultrasonic transceiver head 49 scans the entire length of weld seam 1 54 and weld seam 2 55;

[0070] During the inspection phase of weld seam 1 54 and weld seam 2 55 , the end shell 42 continuously injects liquid medium into the compensation space 6 through the nozzle 44 , causing the original liquid and gas in the compensation space 6 to overflow through the straight groove 48 .

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A device for testing the weld strength of an APU diffuser, characterized in that: include: A box body, the box body opening is upward, a rotatable carrying roller is provided at the bottom of the inner side of the box body, a diffuser is mounted above the carrying roller, the diffuser is welded to the drainage sleeve and the cone to form a second weld seam, and a plurality of blades are welded to the inner diffusion wall of the cone near the drainage sleeve to form a plurality of first weld seams; The drive assembly includes a linear slide, which is fixed at the top opening of the box body and arranged parallel to the axis of the drainage sleeve. The linear slide is connected to a telescopic arm via a swing joint, and the free end of the telescopic arm is equipped with a first rotary joint, and the end of the rotating shaft of the first rotary joint is equipped with a second rotary joint; The probe includes a housing, the housing being mounted on the end of the rotating shaft of the second rotating joint, an ultrasonic transceiver head being embedded in the lower portion of the housing, end shells being provided on both sides of the ultrasonic transceiver head, a spray hole being provided at the bottom of the end shells, and a liquid supply device being provided at the top of the end shells; The blade has a blade surface 1, an end surface 1, an end surface 2, and a blade surface 2. The weld seam 1 is formed between the blade surface 1, the end surface 1, the end surface 2, the blade surface 2, and the inner diffusion wall of the cone. The annular end surface 1 of the cone is welded to the annular end surface 2 of the drainage sleeve to form a weld seam 2. The outer shell and the end shell are both provided with round chamfers at the bottom long sides, and the ultrasonic transceiver head is provided with an oblique end surface at the round chamfer, and the oblique end surface forms an angle of 45 degrees with the horizontal plane; A baffle is installed on the side of the end shell away from the outer shell, and a notch is opened on the baffle corresponding to the round chamfer. The baffle adopts a deformable elastic plate structure, and a compensation space is formed between the two baffles. The spray hole is located in the compensation space; A lining plate is installed on the vertical side wall of the shell. A vertically extending straight groove is opened on the side of the lining plate facing away from the shell. The compensation space is connected with the outside air through the straight groove.

2. The device for testing the weld strength of an APU diffuser according to claim 1, characterized in that: The liquid supplier comprises a pump and a hose. The outlet end of the pump is connected and fixed to the end shell. The hose is installed at the inlet end of the pump and communicates with an external liquid supply device.

3. The device for testing the weld strength of an APU diffuser according to claim 1, characterized in that: The box body contains a liquid medium, the liquid level of the liquid medium is higher than the lowest weld seam in the diffuser, and the liquid supplier is connected to the liquid medium in the box body through a pipeline.

4. The device for testing the weld strength of an APU diffuser according to claim 1, characterized in that: The carrying roller includes a drainage sleeve support roller and a cone support roller. The circumferential outer wall of the drainage sleeve support roller matches the circumferential outer wall of the drainage sleeve, and the cone support roller matches the outer wall of the cone away from the drainage sleeve.

5. The device for testing the weld strength of an APU diffuser according to claim 1, characterized in that: The lower end of the end shell adopts an elastically deformable structure, and the end shell can be squeezed and collapsed when contacting the inner diffusion wall of the cone.

6. A method for testing the weld strength of an APU diffuser, the device for testing the weld strength of an APU diffuser according to claim 1, characterized in that: The steps include: Preparation stage 1: hoist the diffuser into the box, set it on the guide sleeve support roller and the cone support roller, and rotate the diffuser so that the lowest blade is in a vertical state; In the second preparation phase, the drive assembly is activated so that the ultrasonic transceiver head is located at the intersection of the blade surface 1 and the end surface 2, and the center line of the oblique end surface of the ultrasonic transceiver head is parallel to the weld 1 between the blade surface 1 and the inner diffuser wall; In the first stage of weld detection, the telescopic arm moves to enable the ultrasonic transceiver to detect the weld between the blade surface and the inner diffusion wall; In the second stage of weld seam 1 detection, the first and second rotary joints move to enable the ultrasonic transceiver to detect weld seam 1 between the end face 1 and the inner diffusion wall; In the third phase of weld seam 1 inspection, the drive assembly is activated, causing the ultrasonic transceiver to detect weld seam 1 between blade surface 1 and the inner diffuser wall again. This process continues until the ultrasonic transceiver passes over the intersection of blade surface 1 and end surface 2. The ultrasonic transceiver then detects weld seam 1 between end surface 2 and the inner diffuser wall. In the fourth stage of weld seam inspection, the carrier roller rotates the diffuser, the drive assembly moves, and the ultrasonic transceiver moves to the weld seam between the second blade and the inner diffuser wall for two round trip inspections. During the second weld inspection phase, the drive assembly is activated, and the ultrasonic transceiver detects the second weld between the cone and the drainage sleeve. The carrier rollers rotate the diffuser until the adjacent blades are in a vertical position. Enter the weld seam 1 detection phase 1 again until the ultrasonic transceiver head scans the entire length of weld seam 1 and weld seam 2; During the weld seam one and weld seam two inspection stages, the end shell continuously injects liquid medium into the compensation space through the nozzle hole, causing the original liquid and gas in the compensation space to overflow through the straight groove.

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