A helicopter blade fatigue detection device

Abstract

The application discloses a kind of helicopter blade fatigue detection device, it is related to detection equipment technical field, including mounting bracket, attitude adjustment mechanism, contrast blade and the blade to be measured are installed on attitude adjustment mechanism, top frame is rotatably installed above attitude adjustment mechanism, ultrasonic emission mechanism and ultrasonic receiving mechanism are slidably installed on top frame, and ultrasonic receiving mechanism is connected with index mechanism;Attitude adjustment mechanism includes mounting column and the fixed connecting block of mounting column top, rotating connecting column is inserted into the both sides of fixed connecting block, rotating connecting column is connected with clamping block, both sides clamping block are centrally symmetrically installed, the blade to be measured and contrast blade are respectively installed in the clamping block of both sides, and the blade to be measured and contrast blade are horizontally rotatably installed in clamping block;Combination attitude adjustment mechanism and index mechanism control ultrasonic receiving mechanism to be located at different positions on both sides of the blade to be measured, it is convenient to detect different kinds of fatigue defects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection equipment, and specifically relates to a helicopter blade fatigue degree detection device. BACKGROUND

[0002] During flight, the blade of a helicopter is subjected to alternating loads such as lift, gravity, centrifugal force, etc. For example, during the takeoff and landing stages, the load on the blade changes more dramatically. This long-term alternating load can cause fatigue damage inside the blade material. Meanwhile, the influence of vibration and environmental factors can also exacerbate the fatigue damage inside the blade.

[0003] There are various methods for existing blade fatigue detection, mainly including appearance inspection, ultrasonic detection, magnetic powder detection, and ray detection. Among them, ultrasonic detection is suitable for detection of various materials, and ultrasonic detection has strong penetrating power and can find defects in deep positions of the blade, and meanwhile, it is convenient to locate the defect position. However, the existing ultrasonic detection is mostly in a single probe mode, and the detection effect is not good for layered fatigue damage or smaller fatigue damage. SUMMARY

[0004] The present application aims to provide a helicopter blade fatigue degree detection device to solve the problems in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A helicopter blade fatigue degree detection device comprises a mounting frame, a posture adjusting mechanism is arranged on the mounting frame, a contrast blade and a blade to be detected are respectively mounted on the two sides of the posture adjusting mechanism, a top frame is rotatably mounted above the central axis of the posture adjusting mechanism, an ultrasonic emission mechanism and an ultrasonic receiving mechanism are slidably mounted on the top frame, the ultrasonic receiving mechanism is connected with a rotation mechanism, and the ultrasonic receiving mechanism is adjusted to the upper and lower sides of the blade to be detected or the contrast blade in combination with the rotation mechanism.

[0007] The posture adjusting mechanism comprises a mounting column and a fixed connecting block at the top of the mounting column, rotating connecting columns are inserted into the two sides of the fixed connecting block, clamping blocks are connected with the rotating connecting columns, the two clamping blocks are centrally symmetrically mounted, the blade to be detected and the contrast blade are respectively mounted in the two clamping blocks, and the blade to be detected and the contrast blade are horizontally rotatably mounted in the clamping blocks.

[0008] As a further further scheme of the present application: the top frame is slidably installed with two groups of translation mechanisms, the ultrasonic transmitting mechanism and the ultrasonic receiving mechanism comprise an elevator, one end of the elevator is connected with the translation mechanism, the other end of the elevator is connected with a dispersion frame, the dispersion frame is provided with a transmitting probe or a receiving probe at one end facing the blade to be measured, a coupling agent barrel is connected to the dispersion frame, a plurality of injection tubes are annularly arranged in the dispersion frame, the injection tubes are arranged at the outer circle of the transmitting probe, and a docking cover is arranged at the outer circle of the dispersion frame.

[0009] As a further further scheme of the present application: the translation mechanism comprises a moving frame, the moving frame is slidably installed between the top frame, a walking wheel is rotatably installed at the position close to the inner side edge of the top frame, the walking wheel is in contact with the top frame, a motor three is arranged on the moving frame, the motor three is connected with a transmission gear set, and a driving belt is connected between the transmission gear set and the axis of the walking wheel.

[0010] As a further further scheme of the present application: the posture adjusting mechanism further comprises a connecting rod fixedly connected with the blade to be measured or the control blade, a driven gear is arranged at one end of the connecting rod, a motor one is arranged on the clamping block, a driving gear is connected with the motor one, the driving gear and the driven gear are in mesh with each other, an external gear ring is arranged on the rotating connecting column, a motor two is arranged on the mounting frame, a bevel gear set is connected with the motor two, a driving gear is connected with the bevel gear set, the driving gear is arranged at both sides of the mounting frame and in mesh with the external gear ring.

[0011] As a further further scheme of the present application: the rotating mechanism comprises an arc-shaped frame, a clamping sliding groove is arranged in the arc-shaped frame, a horizontal guide rail is installed in the clamping sliding groove, the horizontal guide rail is slidably connected with the clamping sliding groove through a connecting sliding block, the ultrasonic receiving mechanism is slidably installed between the horizontal guide rail, an arc-shaped rack is arranged at the edge of the arc-shaped frame, a driving assembly is arranged at the end of the horizontal guide rail, the driving assembly drives the horizontal guide rail to rotate along the arc-shaped rack or drives the ultrasonic receiving mechanism to move horizontally along the horizontal guide rail.

[0012] As a further further scheme of the present application: the driving assembly comprises a threaded matching block slidably matched and installed in the horizontal guide rail, a driving screw is rotatably installed in the horizontal guide rail, the threaded matching block and the driving screw are matched with each other, a motor four is fixedly connected with the end of the horizontal guide rail, an output shaft is connected with the motor four, a rotating gear is rotatably installed on the output shaft, the rotating gear and the arc-shaped rack are in mesh with each other, a switching block is arranged between the rotating gear and the driving screw, a push-pull motor is connected with the switching block, the push-pull motor is fixedly installed between the horizontal guide rail, and the push-pull motor drives the switching block to move back and forth.

[0013] As a further embodiment of the present invention: a plurality of snap-fit ​​blocks are arranged in a ring on the side of the switching block facing the indexing gear, and the indexing gear is provided with a mating groove corresponding to the snap-fit ​​block. A mating shaft one is provided at the end of the switching block facing the output shaft, and the mating shaft one is inserted into the output shaft. A mating shaft two and an insertion shaft are provided at the end of the switching block facing the drive screw, and the mating shaft two is inserted into the port of the drive screw. Annular slots are provided on both sides of the switching block, and the push-pull motor is connected to a fastening frame, which engages with the annular slots on both sides of the switching block.

[0014] As a further embodiment of the present invention: a counterweight is provided on the side of the top frame away from the ultrasonic transmitting mechanism, and the docking cover has a frustum-shaped telescopic structure.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] (1) By combining the ultrasonic transmitting mechanism and the ultrasonic receiving mechanism to perform ultrasonic testing on the same part of the blade under test and the control blade respectively, and comparing the ultrasonic test data, the specific defect state of the inner side of the blade under test can be determined, which facilitates the determination of the defect type and the specific location of the defect. Fatigue damage causes cracks or delamination inside the blade. These cracks may be distributed vertically or horizontally. In order to improve the ultrasonic testing capability, the ultrasonic receiving mechanism is connected to the indexing mechanism, so that the ultrasonic receiving mechanism can receive the signal emitted by the ultrasonic transmitting mechanism from multiple angles, thereby comprehensively judging the specific situation of the internal defects of the blade under test. When the cracks caused by fatigue defects are distributed vertically, the ultrasonic receiving mechanism and the ultrasonic transmitting mechanism are located on the same side of the blade under test to obtain better test data; when the cracks caused by fatigue defects are distributed horizontally, the ultrasonic receiving mechanism and the ultrasonic transmitting mechanism are located on both sides of the blade under test to obtain better test data.

[0017] (2) The clamping block installed in a centrally symmetrical manner can make the blade to be tested and the control blade also centrally symmetrical. After the ultrasonic transmitting mechanism and the ultrasonic receiving structure perform ultrasonic testing on the blade to be tested, the blade to be tested is controlled to rotate horizontally in the clamping block, and the rotating connecting column is combined to make the blade to be tested point downward, so as to prevent interference between the blade to be tested and the rotation mechanism when the top frame is subsequently rotated to the control blade position.

[0018] (3) The ultrasonic receiving mechanism is rotated along the arc frame by the drive assembly, so as to adjust the ultrasonic receiving mechanism to be on the same side or different sides of the blade to be tested as needed, for detecting different types of fatigue defects. The power on the output shaft is switched to the indexing gear or the drive screw by the switching block. When the power is switched to the indexing gear, the motor will drive the indexing gear to mesh with the arc rack, which will drive the horizontal guide rail and the ultrasonic receiving mechanism to move along the arc frame. When the power is switched to the drive screw, the ultrasonic receiving mechanism will move horizontally. When the ultrasonic receiving mechanism and the ultrasonic transmitting mechanism are located on the two sides of the blade to be tested, the drive screw can adjust the position of the ultrasonic receiving mechanism relative to the ultrasonic transmitting mechanism, so as to receive the ultrasonic signal more accurately. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the attitude adjustment mechanism in this invention.

[0021] Figure 3 This is a schematic diagram of the connection structure between the ultrasonic transmitting mechanism and the top frame in this invention.

[0022] Figure 4 This is a schematic diagram of the ultrasonic transmitting mechanism in this invention.

[0023] Figure 5 This is a schematic diagram of the ultrasonic receiving mechanism located on the underside of the blade to be tested in this invention.

[0024] Figure 6 for Figure 5 Enlarged structural diagram at point A in the middle.

[0025] Figure 7 This is a schematic diagram of the rotation mechanism in this invention.

[0026] Figure 8 This is a schematic diagram of the installation of the switching block in this invention.

[0027] Figure 9 This is a schematic diagram of the switching block in this invention.

[0028] In the diagram: 1. Mounting frame; 2. Attitude adjustment mechanism; 20. Mounting column; 21. Fixed connecting block; 22. Rotating connecting column; 23. External gear ring; 24. Clamping block; 25. Connecting rod; 26. Driven gear; 27. Driving gear; 28. Motor 1; 29. ​​Drive gear; 210. Motor 2; 30. Reference blade; 31. Blade to be tested; 4. Top frame; 400. Counterweight; 40. Moving frame; 41. Traveling wheel; 42. Drive belt; 43. Transmission gear set; 44. Motor 3; 5. Ultrasonic transmitting mechanism; 50. Elevator; 51. 52. Coupling agent container; 53. Dispersion rack; 54. Docking cover; 55. Injection tube; 56. Transmitting probe; 77. Ultrasonic receiving mechanism; 78. Indexing mechanism; 79. Arc-shaped frame; 70. Snap-fit ​​groove; 70. Arc-shaped rack; 71. Horizontal guide rail; 72. Connecting slider; 73. Drive screw; 74. Threaded mating block; 75. Motor four; 76. Output shaft; 77. Indexing gear; 78. Switching block; 780. Snap-fit ​​block; 781. Mating shaft one; 782. Mating shaft two; 783. Annular slot; 784. Insertion shaft; 79. Push-pull motor. Detailed Implementation

[0029] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0030] like Figure 1 As shown, a helicopter blade fatigue testing device includes a mounting frame 1, on which an attitude adjustment mechanism 2 is provided. A reference blade 30 and a blade to be tested 31 are respectively installed on both sides of the attitude adjustment mechanism 2. A top frame 4 is rotatably installed above the central axis of the attitude adjustment mechanism 2. An ultrasonic transmitting mechanism 5 and an ultrasonic receiving mechanism 6 are slidably installed on the top frame 4. The ultrasonic receiving mechanism 6 is connected to a shifting mechanism 7. The ultrasonic receiving mechanism 6, in conjunction with the shifting mechanism 7, is adjusted to the upper and lower sides of the blade to be tested 31 or the reference blade 30, respectively.

[0031] Specifically, a control blade 30 and a blade to be tested 31 are set up respectively. The ultrasonic transmitting mechanism 5 and the ultrasonic receiving mechanism 6 are used to perform ultrasonic testing on the same part of the blade to be tested 31 and the control blade 30 respectively. The ultrasonic test data are compared to determine the specific defect status of the inner side of the blade to be tested 31, which makes it easier to determine the type and specific location of the defect.

[0032] More specifically, fatigue damage causes cracks or delamination inside the blade. These cracks may be vertical or horizontal. To improve ultrasonic testing capabilities, the ultrasonic receiving mechanism 6 is connected to the indexing mechanism 7, allowing the ultrasonic receiving mechanism 6 to receive signals from the ultrasonic transmitting mechanism 5 at multiple angles, thereby comprehensively judging the specific situation of internal defects in the blade 31 under test. When the cracks caused by fatigue defects are vertically distributed, better detection data can be obtained when the ultrasonic receiving mechanism 6 and the ultrasonic transmitting mechanism 5 are located on the same side of the blade 31 under test; when the cracks caused by fatigue defects are horizontally delaminated, better detection data can be obtained when the ultrasonic receiving mechanism 6 and the ultrasonic transmitting mechanism 5 are located on opposite sides of the blade 31 under test.

[0033] like Figure 1 , Figure 2 As shown, the attitude adjustment mechanism 2 includes a mounting column 20 and a fixed connecting block 21 at the top of the mounting column 20. Rotating connecting columns 22 are inserted into both sides of the fixed connecting block 21. The rotating connecting columns 22 are connected to clamping blocks 24. The clamping blocks 24 on both sides are installed symmetrically at the center. The blade to be tested 31 and the control blade 30 are respectively installed in the clamping blocks 24 on both sides. The blade to be tested 31 and the control blade 30 are installed horizontally and rotated within the clamping blocks 24.

[0034] Specifically, the centrally symmetrically installed clamping block 24 allows the blade under test 31 and the control blade 30 to also be centrally symmetrically installed. After the ultrasonic transmitting mechanism 5 and the ultrasonic receiving structure perform ultrasonic testing on the blade under test 31, the blade under test 31 is controlled to rotate horizontally within the clamping block 24, and the rotating connecting column 22 is used to make the blade under test 31 point downwards, so as to prevent interference between the blade under test 31 and the rotation mechanism 7 when the top frame 4 is subsequently rotated to the control blade 30 position.

[0035] Furthermore, such as Figure 1 , Figure 3 , Figure 4 As shown, two sets of translation mechanisms are slidably installed inside the top frame 4. The ultrasonic transmitting mechanism 5 and the ultrasonic receiving mechanism 6 include a lift 50. One end of the lift 50 is connected to the translation mechanism, and the other end of the lift 50 is connected to a dispersion frame 52. A transmitting probe 55 or a receiving probe is provided at the end of the dispersion frame 52 facing the blade 31 to be tested. A coupling agent tank 51 is connected to the dispersion frame 52. Multiple injection tubes 54 are arranged in a ring inside the dispersion frame 52. The injection tubes 54 are located on the outer ring of the transmitting probe 55. A docking cover 53 is provided on the outer ring of the dispersion frame 52.

[0036] Specifically, by setting up a coupling agent tank 51 and multiple injection tubes 54, the coupling agent is injected into the outer ring of the transmitting probe 55 or the receiving probe, so that the ultrasonic waves can enter the blade 31 under test and be received by the ultrasonic receiving mechanism 6. When the test is completed, the coupling agent is drawn back into the coupling agent tank 51 by combining the injection tubes 54 and the docking cover 53, thereby reducing the amount of coupling agent used and wasted.

[0037] Furthermore, such as Figure 3 As shown, the translation mechanism includes a movable frame 40, which is slidably installed with the top frame 4. A traveling wheel 41 is rotatably installed on the movable frame 40 near the inner edge of the top frame 4. The traveling wheel 41 is in contact with the top frame 4. A motor 44 is provided on the movable frame 40. The motor 44 is connected to a transmission gear set 43. A drive belt 42 is connected between the transmission gear set 43 and the axis of the traveling wheel 41.

[0038] Specifically, the distance between the ultrasonic transmitting mechanism 5 and the ultrasonic receiving mechanism 6 is adjusted according to the testing needs. The walking wheels 41 set in the moving frame 40 are in contact with the top frame 4, and the walking wheels 41 are rotated by the motor 3 44, thereby adjusting the distance between the two sets of translation mechanisms.

[0039] Furthermore, such as Figure 1 , Figure 2 As shown, the attitude adjustment mechanism 2 also includes a connecting rod 25 fixedly connected to the blade to be tested 31 or the reference blade 30. One end of the connecting rod 25 is provided with a driven gear 26. The clamping block 24 is provided with a motor 28. The motor 28 is connected to a driving gear 27. The driving gear 27 and the driven gear 26 mesh with each other. The rotating connecting column 22 is provided with an external gear ring 23. The mounting frame 1 is provided with a motor 210. The motor 210 is connected to a bevel gear set. The bevel gear set is connected to a drive gear 29. The drive gear 29 is distributed on both sides of the mounting frame 1 and meshes with the external gear ring 23.

[0040] Specifically, after the ultrasonic testing of the blade 31 is completed, the connecting rod 25 is first rotated by the motor 28 to the position of the blade. Figure 1 The angles of the two sides are perpendicular to each other. Then, the motor 210 drives the drive gear 29 to mesh with the external gear ring 23. At this time, the clamping block 24 drives the blade to be tested 31 to rotate downward. Then, the top frame 4 is controlled to rotate to the upper side of the reference blade 30, and the reference blade 30 is controlled to return to the initial angle. The ultrasonic transmitting mechanism 5 and the ultrasonic receiving mechanism 6 are used to perform ultrasonic testing on the reference blade 30. The data of the two sides are compared to determine the type of defect and the specific location of the defect on the inner side of the blade to be tested 31.

[0041] Furthermore, such asFigure 1 , Figure 5 , Figure 6 As shown, the indexing mechanism 7 includes an arc-shaped frame 70, a snap-fit ​​groove 71 is provided inside the arc-shaped frame 70, a horizontal guide rail 73 is installed inside the snap-fit ​​groove 71, the horizontal guide rail 73 is slidably engaged with the snap-fit ​​groove 71 through a connecting slider 730, the ultrasonic receiving mechanism 6 is slidably installed between the ultrasonic receiving mechanism 6 and the horizontal guide rail 73, the edge of the arc-shaped frame 70 is provided with an arc-shaped rack 72, and the end of the horizontal guide rail 73 is provided with a driving component, the driving component drives the horizontal guide rail 73 to rotate along the arc-shaped rack 72 or drives the ultrasonic receiving mechanism 6 to move horizontally along the horizontal guide rail 73.

[0042] Furthermore, such as Figure 6 , Figure 7 , Figure 8 As shown, the drive assembly includes a threaded engagement block 75 slidably mounted within a horizontal guide rail 73, a drive screw 74 rotatably mounted within the horizontal guide rail 73, and the threaded engagement block 75 and the drive screw 74 engaging with each other. A motor 76 is fixedly connected to the end of the horizontal guide rail 73, and the motor 76 is connected to an output shaft 760. A rotary gear 77 is rotatably mounted on the output shaft 760, and the rotary gear 77 meshes with an arc-shaped rack 72. A switching block 78 is provided between the rotary gear 77 and the drive screw 74, and a push-pull motor 79 is connected to the switching block 78. The push-pull motor 79 is fixedly mounted between the horizontal guide rail 73 and drives the switching block 78 to move back and forth.

[0043] Specifically, the ultrasonic receiving mechanism 6 is rotated along the arc frame 70 by the drive assembly, thereby adjusting its position on the same side or different sides of the blade 31 under test as needed to detect different types of fatigue defects. The power on the output shaft 760 is switched to the indexing gear 77 or the drive screw 74 via the switching block 78. When the power is switched to the indexing gear 77, the motor 76 drives the indexing gear 77 to mesh with the arc rack 72, which in turn moves the horizontal guide rail 73 and the ultrasonic receiving mechanism 6 along the arc frame 70. When the power is switched to the drive screw 74, the ultrasonic receiving mechanism 6 moves horizontally. When the ultrasonic receiving mechanism 6 and the ultrasonic transmitting mechanism 5 are located on opposite sides of the blade 31 under test, the drive screw 74 can adjust the position of the ultrasonic receiving mechanism 6 relative to the ultrasonic transmitting mechanism 5, thereby receiving ultrasonic signals more accurately.

[0044] Furthermore, such as Figure 8 , Figure 9As shown, the switching block 78 has multiple locking blocks 780 arranged in a ring on the side facing the indexing gear 77. The indexing gear 77 has a mating groove corresponding to the locking block 780. The end of the switching block 78 facing the output shaft 760 is provided with a mating shaft 1 781, which is inserted into the output shaft 760. The end of the switching block 78 facing the drive screw 74 is provided with a mating shaft 2 782 and an insertion shaft 784, which is inserted into the port of the drive screw 74. The two sides of the switching block 78 are provided with annular slots 783. The push-pull motor 79 is connected to a fastening frame, which cooperates with the annular slots 783 on both sides of the switching block 78.

[0045] Specifically, the push-pull motor 79 and the fastening frame drive the switching block 78 to move back and forth, thereby switching the power connection. When the push-pull motor 79 shortens, it drives the switching block 78 to move towards the drive screw 74. The mating shaft 782 on the switching block 78 engages with the end of the drive screw 74, thereby driving the drive screw 74 to rotate and controlling the ultrasonic receiving mechanism 6 to move along the horizontal guide rail 73. When the push-pull motor 79 extends, the mating shaft 782 disengages from the drive screw 74, and the snap-fit ​​block 780 on the switching block 78 engages with the mating groove on the indexing gear 77, thereby connecting the power on the output shaft 760 with the indexing gear 77, driving the ultrasonic receiving mechanism 6 and the horizontal guide rail 73 to rotate along the arc frame 70, thereby adjusting the position of the ultrasonic receiving mechanism 6 relative to the blade 31 to be tested according to the detection requirements.

[0046] Furthermore, such as Figure 1 , Figure 3 As shown, a counterweight 400 is provided on the side of the top frame 4 away from the ultrasonic transmitting mechanism 5, and the docking cover 53 has a frustum-shaped telescopic structure.

[0047] Specifically, to ensure the stability of the ultrasonic transmitting mechanism 5 and the ultrasonic receiving mechanism 6 during the adjustment process, a counterweight 400 is provided on the other side of the top frame 4. At the same time, the docking cover 53 is designed to be telescopic, which allows the docking cover 53 to better fit with the blade to be tested 31 or the control blade 30, reducing the overflow of the coupling agent and facilitating the subsequent recovery of the coupling agent.

[0048] The working principle of this invention embodiment is as follows:

[0049] like Figures 1-9As shown, a control blade 30 and a blade 31 to be tested are respectively set up. Ultrasonic testing is performed on the same parts of both the blade 31 and the control blade 30 using an ultrasonic transmitting mechanism 5 and an ultrasonic receiving mechanism 6. The ultrasonic test data are compared to determine the specific defect state inside the blade 31, facilitating the identification of the defect type and location. Fatigue damage causes cracks or delamination inside the blade. These cracks may be vertical or horizontal. To improve ultrasonic testing capabilities, the ultrasonic receiving mechanism 6 is connected to the indexing mechanism 7, allowing the ultrasonic receiving mechanism 6 to receive signals from the ultrasonic transmitting mechanism 5 at multiple angles, thus comprehensively judging the specific condition of the internal defects in the blade 31. When the cracks caused by fatigue defects are vertically distributed, better test data can be obtained when the ultrasonic receiving mechanism 6 and the ultrasonic transmitting mechanism 5 are located on the same side of the blade 31. When the cracks caused by fatigue defects are horizontally delaminated, better test data can be obtained when the ultrasonic receiving mechanism 6 and the ultrasonic transmitting mechanism 5 are located on opposite sides of the blade 31. The centrally symmetrically installed clamping block 24 allows the test blade 31 and the control blade 30 to also be centrally symmetrically installed. After the ultrasonic transmitting mechanism 5, in conjunction with the ultrasonic receiving structure, performs ultrasonic testing on the test blade 31, the test blade 31 is controlled to rotate horizontally within the clamping block 24. Combined with the rotating connecting column 22, the test blade 31 is positioned downwards, facilitating subsequent rotation of the top frame 4 to the control blade 30 position and preventing interference between the test blade 31 and the rotation mechanism 7. By setting up a coupling agent tank 51 and multiple injection tubes 54, coupling agent is injected into the outer ring of the transmitting probe 55 or the receiving probe, facilitating the entry of ultrasonic waves into the test blade 31 and their reception by the ultrasonic receiving mechanism 6. Upon completion of the test, the coupling agent is drawn back into the coupling agent tank 51 using the injection tubes 54 and the docking cover 53, reducing the amount of coupling agent used and wasted. The driving assembly rotates the ultrasonic receiving mechanism 6 along the arc-shaped frame 70, allowing the ultrasonic receiving mechanism 6 to be positioned on the same or different sides of the test blade 31 as needed, for detecting different types of fatigue defects. The power on the output shaft 760 is switched to the indexing gear 77 or the drive screw 74 via the switching block 78. When the power is switched to the indexing gear 77, the motor 76 will drive the indexing gear 77 to mesh with the arc rack 72, which will drive the horizontal guide rail 73 and the ultrasonic receiving mechanism 6 to move along the arc frame 70. When the power is switched to the drive screw 74, it will drive the ultrasonic receiving mechanism 6 to move horizontally. When the ultrasonic receiving mechanism 6 and the ultrasonic transmitting mechanism 5 are located on both sides of the blade 31 to be tested, the drive screw 74 can adjust the position of the ultrasonic receiving mechanism 6 relative to the ultrasonic transmitting mechanism 5, so as to receive the ultrasonic signal more accurately.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A helicopter blade fatigue testing device, comprising a mounting bracket (1), characterized in that, The mounting frame (1) is provided with an attitude adjustment mechanism (2). A control blade (30) and a blade to be tested (31) are respectively installed on both sides of the attitude adjustment mechanism (2). A top frame (4) is rotatably installed above the central axis of the attitude adjustment mechanism (2). An ultrasonic transmitting mechanism (5) and an ultrasonic receiving mechanism (6) are slidably installed on the top frame (4). The ultrasonic receiving mechanism (6) is connected to a rotation mechanism (7). The ultrasonic receiving mechanism (6) is adjusted back and forth between the upper and lower sides of the blade to be tested (31) or the control blade (30) through the rotation mechanism (7). The attitude adjustment mechanism (2) includes a mounting column (20) and a fixed connecting block (21) at the top of the mounting column (20). Rotating connecting columns (22) are inserted into both sides of the fixed connecting block (21). The rotating connecting column (22) is connected to a clamping block (24). The clamping blocks (24) on both sides are installed symmetrically at the center. The blade to be tested (31) and the control blade (30) are respectively installed in the clamping blocks (24) on both sides. The blade to be tested (31) and the control blade (30) are installed horizontally and rotated in the clamping blocks (24). The indexing mechanism (7) includes an arc frame (70), a snap-fit ​​groove (71) is provided in the arc frame (70), a horizontal guide rail (73) is installed in the snap-fit ​​groove (71), the horizontal guide rail (73) is slidably engaged with the snap-fit ​​groove (71) through a connecting slider (730), the ultrasonic receiving mechanism (6) is slidably installed with the horizontal guide rail (73), an arc rack (72) is provided on the edge of the arc frame (70), and a driving component is provided at the end of the horizontal guide rail (73). The driving component drives the horizontal guide rail (73) to rotate along the arc rack (72) or drives the ultrasonic receiving mechanism (6) to move horizontally along the horizontal guide rail (73). The drive assembly includes a threaded engagement block (75) that is slidably installed inside a horizontal guide rail (73). A drive screw (74) is rotatably installed inside the horizontal guide rail (73). The threaded engagement block (75) and the drive screw (74) cooperate with each other. A motor (76) is fixedly connected to the end of the horizontal guide rail (73). The motor (76) is connected to an output shaft (760). A rotary gear (77) is rotatably installed on the output shaft (760). The rotary gear (77) meshes with an arc-shaped rack (72). A switching block (78) is provided between the rotary gear (77) and the drive screw (74). A push-pull motor (79) is connected to the switching block (78). The push-pull motor (79) is fixedly installed between the horizontal guide rail (73). The push-pull motor (79) drives the switching block (78) to move back and forth.

2. The helicopter blade fatigue testing device according to claim 1, characterized in that, Two sets of translation mechanisms are slidably installed inside the top frame (4). The ultrasonic transmitting mechanism (5) and the ultrasonic receiving mechanism (6) include a lift (50). One end of the lift (50) is connected to one of the translation mechanisms. The other end of the lift (50) is connected to a dispersion frame (52). A transmitting probe (55) or a receiving probe is provided at the end of the dispersion frame (52) facing the blade (31) to be tested. A coupling agent barrel (51) is connected to the dispersion frame (52). Multiple injection tubes (54) are arranged in a ring inside the dispersion frame (52). The injection tubes (54) are arranged on the outer ring of the transmitting probe (55). A docking cover (53) is provided on the outer ring of the dispersion frame (52).

3. The helicopter blade fatigue testing device according to claim 2, characterized in that, The translation mechanism includes a movable frame (40), which is slidably installed with the top frame (4). A traveling wheel (41) is rotatably installed on the movable frame (40) near the inner edge of the top frame (4). The traveling wheel (41) is in contact with the top frame (4). A motor (44) is provided on the movable frame (40). The motor (44) is connected to a transmission gear set (43). A drive belt (42) is connected between the transmission gear set (43) and the axis of the traveling wheel (41).

4. The helicopter blade fatigue testing device according to claim 1, characterized in that, The attitude adjustment mechanism (2) further includes a connecting rod (25) fixedly connected to the blade to be tested (31) or the reference blade (30). One end of the connecting rod (25) is provided with a driven gear (26). The clamping block (24) is provided with a motor (28). The motor (28) is connected to a driving gear (27). The driving gear (27) and the driven gear (26) mesh with each other. The rotating connecting column (22) is provided with an external gear ring (23). The mounting frame (1) is provided with a motor (210). The motor (210) is connected to a bevel gear set. The bevel gear set is connected to a drive gear (29). The drive gear (29) is distributed on both sides of the mounting frame (1) and meshes with the external gear ring (23).

5. The helicopter blade fatigue testing device according to claim 1, characterized in that, The switching block (78) has multiple snap-fit ​​blocks (780) arranged in a ring on one side facing the indexing gear (77). The indexing gear (77) has a mating groove corresponding to the snap-fit ​​block (780). The switching block (78) has a mating shaft one (781) at one end facing the output shaft (760), which is inserted into the output shaft (760). The switching block (78) has a mating shaft two (782) and an insertion shaft (784) at one end facing the drive screw (74), which are inserted into the port of the drive screw (74). The switching block (78) has annular slots (783) on both sides. The push-pull motor (79) is connected to a fastening frame, which is engaged with the annular slots (783) on both sides of the switching block (78).

6. The helicopter blade fatigue testing device according to claim 2, characterized in that, The top frame (4) is provided with a counterweight (400) on the side away from the ultrasonic transmitting mechanism (5), and the docking cover (53) has a frustum-shaped telescopic structure.

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