Helicopter blade fatigue detection device

Abstract

The invention discloses a helicopter blade fatigue detection device, and relates to the technical field of detection equipment, the helicopter blade fatigue detection device comprises a mounting frame and a posture adjusting mechanism, a contrast blade and a to-be-detected blade are mounted on the posture adjusting mechanism, a top frame is rotatably mounted above the posture adjusting mechanism, and an ultrasonic transmitting mechanism and an ultrasonic receiving mechanism are slidably mounted on the top frame; the ultrasonic receiving mechanism is connected with an indexing mechanism; 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 and connected with clamping blocks, the clamping blocks on the two sides are mounted in a central symmetry mode, and a blade to be detected and a contrast blade are mounted in the clamping blocks on the two sides respectively; the to-be-detected blade and the contrast blade are horizontally and rotatably mounted in the clamping block; and the posture adjusting mechanism and the transposition mechanism are combined to control the ultrasonic receiving mechanism to be located at different positions on the two sides of the to-be-detected blade, so that different types of fatigue defects can be conveniently detected.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, specifically a helicopter blade fatigue testing device. Background Technology

[0002] During helicopter flight, the blades are constantly subjected to alternating loads such as lift, gravity, and centrifugal force. For example, during takeoff and landing, the load changes on the blades are more drastic, and this long-term alternating load can cause fatigue damage to the blade material. Vibration and environmental factors can also exacerbate this internal fatigue damage.

[0003] There are various existing methods for blade fatigue testing, mainly including visual inspection, ultrasonic testing, magnetic particle testing, and radiographic testing. Among them, ultrasonic testing is suitable for testing a variety of materials and has strong penetrating power, which can detect defects deep within the blade and facilitate defect location. However, most existing ultrasonic testing methods are single-probe modes, which are not effective in detecting delamination fatigue damage or small fatigue damage. Summary of the Invention

[0004] The purpose of this invention is to provide a helicopter blade fatigue testing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A helicopter blade fatigue testing device includes a mounting frame with an attitude adjustment mechanism. A reference blade and a blade to be tested are respectively mounted on both sides of the attitude adjustment mechanism. A top frame is rotatably mounted above the central axis of the attitude adjustment mechanism. An ultrasonic transmitting mechanism and an ultrasonic receiving mechanism are slidably mounted on the top frame. The ultrasonic receiving mechanism is connected to a rotation mechanism. The ultrasonic receiving mechanism, in conjunction with the rotation mechanism, is adjusted to the upper and lower sides of the blade to be tested or the reference blade, respectively.

[0007] The attitude adjustment mechanism includes a mounting column and a fixed connecting block at the top of the mounting column. Rotating connecting columns are inserted into both sides of the fixed connecting block. The rotating connecting columns are connected to clamping blocks. The clamping blocks on both sides are installed symmetrically at the center. The blade to be tested and the control blade are respectively installed in the clamping blocks on both sides. The blade to be tested and the control blade are installed horizontally and rotated within the clamping blocks.

[0008] As a further embodiment of the present invention: two sets of translation mechanisms are slidably installed inside the top frame; the ultrasonic transmitting mechanism and the ultrasonic receiving mechanism include a lift; one end of the lift is connected to the translation mechanism; the other end of the lift is connected to a dispersion frame; a transmitting probe or a receiving probe is provided at the end of the dispersion frame facing the blade to be tested; a coupling agent barrel is connected to the dispersion frame; multiple injection tubes are arranged in a ring inside the dispersion frame; the injection tubes are located on the outer ring of the transmitting probe; and a docking cover is provided on the outer ring of the dispersion frame.

[0009] As a further embodiment of the present invention: the translation mechanism includes a movable frame, which is slidably installed with a top frame. A traveling wheel is rotatably installed on the movable frame near the inner edge of the top frame. The traveling wheel is in contact with the top frame. A motor is provided on the movable frame. The motor is connected to a transmission gear set. A drive belt is connected between the transmission gear set and the axis of the traveling wheel.

[0010] As a further embodiment of the present invention: the attitude adjustment mechanism further includes a connecting rod fixedly connected to the blade to be tested or the reference blade, one end of the connecting rod is provided with a driven gear, a motor is provided on the clamping block, the motor is connected to a driving gear, the driving gear and the driven gear mesh with each other, an external gear ring is provided on the rotating connecting column, a second motor is provided on the mounting frame, the second motor is connected to a bevel gear set, the bevel gear set is connected to a drive gear, the drive gear is distributed on both sides of the mounting frame and meshes with the external gear ring.

[0011] As a further embodiment of the present invention: the indexing mechanism includes an arc-shaped frame, a snap-fit ​​groove is provided inside the arc-shaped frame, a horizontal guide rail is installed inside the snap-fit ​​groove, the horizontal guide rail is slidably engaged with the snap-fit ​​groove via a connecting slider, the ultrasonic receiving mechanism is slidably installed between the ultrasonic receiving mechanism and the horizontal guide rail, an arc-shaped rack is provided on the edge of the arc-shaped frame, and a driving component is provided at the end of the horizontal guide rail, the driving component 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 embodiment of the present invention: the driving assembly includes a threaded engagement block slidably mounted inside a horizontal guide rail, a driving screw rotatably mounted inside the horizontal guide rail, the threaded engagement block and the driving screw engaging with each other, a motor four fixedly connected to the end of the horizontal guide rail, an output shaft connected to the motor four, a rotary gear rotatably mounted on the output shaft, the rotary gear meshing with an arc-shaped rack, a switching block provided between the rotary gear and the driving screw, a push-pull motor connected to the switching block, the push-pull motor fixedly mounted to the horizontal guide rail, and the push-pull motor driving 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 as Figure 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) and the rotation mechanism (7) are respectively adjusted to the upper and lower sides of the blade to be tested (31) or the control blade (30). 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 centrally symmetrically installed. 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 horizontally rotated in the clamping blocks (24).

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 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).

6. The helicopter blade fatigue testing device according to claim 5, characterized in that, 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.

7. The helicopter blade fatigue testing device according to claim 6, 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), and the mating shaft one (781) 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), and the mating shaft two (782) is 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, and the fastening frame is engaged with the annular slots (783) on both sides of the switching block (78).

8. 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.

Images