A Helicopter Blade Fatigue Detection Device and Method

Abstract

The present invention relates to the technical field of detection equipment, and particularly relates to a helicopter blade fatigue detection device and method, which includes a housing, a U-shaped detection coil arranged in the middle of the inner top surface of the housing, a support box arranged inside the housing at a position corresponding to the U-shaped detection coil, and further includes two groups of clamping and flipping members arranged on both sides of the inner side surface of the housing close to the U-shaped detection coil. During the use of the present invention, the two end faces of the blade will be clamped and fixed by two clamping frames first, thereby completing the fixing work of the blade. As the work progresses, the clamping plate gradually fixes the side surface of the blade to ensure the clamping effect on the blade when the blade needs to rotate. After the blade completes the rotation work, the clamping plate gradually cancels the clamping work on the side surface of the blade to ensure that the magnetic suspension liquid can fully cover the surface of the blade and ensure the detection effect of the clamped part of the blade.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, and particularly relates to a helicopter blade fatigue detection device and method. Background Art

[0002] The fatigue detection of helicopter blades mainly includes the following methods: visual inspection, ultrasonic testing (UT), magnetic particle inspection (MPI), eddy current testing (ET), X-ray or CT scanning, and fatigue testing. By comprehensively applying these detection methods, the fatigue condition of helicopter blades can be effectively evaluated, potential fatigue damage can be detected in a timely manner, and safety problems caused by fatigue cracks can be avoided.

[0003] Among them, magnetic particle inspection is a method of observing defects with magnetic particles as the display medium. For the magnetic particle inspection of helicopter blades, the wet magnetic particle inspection method is usually recommended. Magnetic particle inspection is used to detect surface or near-surface defects of ferromagnetic materials. By magnetizing the test part and then spraying a magnetic suspension on the surface of the magnetized inspection equipment, the magnetic suspension will be adsorbed and accumulated at the defect location, realizing the visualization of the scar location of the test part, and it is one of the important tools for defect detection of mechanical engineering equipment.

[0004] When the current magnetic particle inspection equipment detects defects on helicopter blades, the blades must be clamped and fixed first, and then the fixture drives the blades to rotate for full-round flaw detection. However, most inspection equipment relies on the fixture structure to clamp and position the helicopter blades from both sides. During the rotation flaw detection process, the blades are prone to fall or shift under the action of centrifugal force, which will reduce the detection accuracy of the magnetic particle inspection equipment for blade defects. In addition, if the blades are clamped and fixed from the side, it is difficult to fully cover the clamped position when spraying the magnetic suspension, which will affect the detection effect of the clamped part of the blades. Summary of the Invention

[0005] Aiming at the above-mentioned shortcomings of the prior art, the present invention provides a helicopter blade fatigue detection device and method, which can effectively solve the problem of poor detection effect of the existing inspection equipment on helicopter blade defects.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0007] The present invention provides a fatigue detection device for helicopter blades, which includes a housing, a U-shaped detection coil arranged in the middle of the inner top surface of the housing, and a support box arranged inside the housing at a position corresponding to the U-shaped detection coil. The device further includes two sets of clamping and flipping members arranged on both sides of the inner bottom surface of the housing near the two sides of the U-shaped detection coil. The clamping and flipping member includes a first mounting block symmetrically and fixedly installed on both sides of the U-shaped detection coil. A hydraulic telescopic rod is installed on the top surface of the first mounting block. The output end of the hydraulic telescopic rod is connected with a flipping assembly for driving the blade to perform flipping work through a trapezoidal slider. The trapezoidal slider is slidably connected with the hydraulic telescopic rod through a trapezoidal chute. A clamping assembly for cooperating with the flipping assembly is arranged inside the housing, and a driving assembly for driving the clamping assembly to work is arranged inside the first mounting block.

[0008] Among them, the clamping assembly includes a main piston cylinder arranged inside the housing at a position corresponding to the flipping assembly. A main piston rod is elastically slidably connected inside the main piston cylinder through a main spring. The connecting end of the main piston rod is connected with a clamping frame. Clamping plates are arranged on both inner side surfaces of the clamping frame. A limiting groove is opened in the middle of the inner surface of the clamping frame close to the main piston rod.

[0009] Furthermore, the clamping assembly further includes a ventilation groove opened in the middle of the main piston rod. Secondary piston cylinders are installed on both inner surfaces of the main piston rod. A secondary piston rod is elastically slidably connected inside the secondary piston cylinder through a secondary spring. The connecting end of the secondary piston rod is connected with the clamping plate. A connecting pipe for communicating with the ventilation groove is penetratively connected inside the secondary piston cylinder.

[0010] Furthermore, the flipping assembly includes a first connecting block fixedly connected to the side surface of the first mounting block at a position corresponding to the main piston cylinder. A rotating rod is rotatably connected in the middle of the first connecting block. The rotating rod is connected with the main piston cylinder. An extrusion block is fixedly connected to the outer circumferential surface of the rotating rod close to the main piston cylinder. A second mounting block is fixedly installed on the inner side surface of the housing at a position corresponding to the extrusion block. An elastic sliding plate is slidably connected inside the second mounting block. Rectangular baffles are connected to both ends of the elastic sliding plate through connecting frames. A triangular baffle is installed in the middle of the top surface of the elastic sliding plate.

[0011] Furthermore, the driving assembly includes a second elastic airbag connected to the upper part of the trapezoidal slider inside the trapezoidal chute. A buffer airbag is installed on the side surface of the first mounting block at a position corresponding to the second elastic airbag. The second elastic airbag is communicated with the buffer airbag through a pipeline. An air delivery pipe is penetratively connected to the inner side surface of the buffer airbag.

[0012] Further, an annular groove is formed on the outer side of the rotation rod close to the inside of the flipping assembly. The annular groove is connected to the buffer airbag through an air delivery pipe. A communication groove is formed on the annular side surface of the rotation rod corresponding to the position of the air delivery pipe. The annular groove is connected to the inside of the main piston cylinder through the communication groove.

[0013] Further, the flipping assembly further includes two limiting rods on the side of the first connecting block away from the main piston cylinder corresponding to the lower part of the rotation rod. The limiting rods are symmetrically arranged horizontally with respect to the rotation rod. A connecting plate is connected to the annular outer side surface of the rotation rod.

[0014] Further, a second connecting block is installed on the lower surface of the trapezoidal slider. A connecting column is connected to the side surface of the second connecting block close to the connecting plate. The connecting column and the connecting plate are elastically connected through a torsion spring.

[0015] Further, a first elastic airbag is arranged on the extrusion surface of the clamping plate.

[0016] Further, the inner diameter of the communication groove is larger than the inner diameter of the ventilation groove.

[0017] A usage method of a helicopter blade fatigue detection device includes the following steps:

[0018] S1: Vertically place the blade to be detected inside the groove on the support box;

[0019] S2: Start the U-shaped detection coil and perform magnetization on the detection part;

[0020] S3: Drive the spraying assembly to work, spray the magnetic suspension liquid on the blade surface, and then clamp and fix the two end faces of the blade through two clamping frames, thereby completing the clamping and fixing work on both ends of the blade;

[0021] S4: As the work progresses, the clamping plate gradually fixes the side surface of the blade. When the blade completes the rotation work, the clamping plate gradually cancels the clamping work on the side surface of the blade, and the magnetic suspension liquid is sprayed onto the clamped part of the blade side surface;

[0022] S5: Observe whether the magnetic suspension liquid accumulates on the blade surface, and thereby judge whether there are defects on the blade surface.

[0023] The technical solution provided by the present invention has the following beneficial effects compared with the known prior art:

[0024] During the use of the present invention, the two end faces of the blade will be clamped and fixed by two clamping brackets first, and then the fixing work of the blade will be completed. As the work progresses, the clamping plate gradually fixes the side surface of the blade to ensure the clamping effect on the blade when the blade needs to rotate. When the blade finishes the rotation work, the clamping plate gradually cancels the clamping work on the side surface of the blade to ensure that the magnetic suspension liquid can fully cover the surface of the blade and ensure the detection effect of the clamped part of the blade. It should be noted that at this time, the clamping work on the end face of the blade will still be carried out, thereby avoiding the problems that the blade is prone to falling or shifting under the action of centrifugal force during the rotation flaw detection and the clamped position is difficult to be fully covered when spraying the magnetic suspension liquid, and ensuring the detection effect on the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is the overall schematic diagram of the present invention;

[0027] Figure 2 It is the partial structural schematic diagram of the clamping and flipping member of the present invention;

[0028] Figure 3 It is the structural schematic diagram at the flipping assembly of the present invention;

[0029] Figure 4 It is the partial structural schematic diagram at the clamping assembly of the present invention;

[0030] Figure 5 It is the structural schematic diagram at the connection between the main piston cylinder and the main piston rod of the present invention;

[0031] Figure 6 It is the structural schematic diagram at the clamping bracket of the present invention; <>

[0032] Figure 7 It is the partial structural schematic diagram at the communication groove of the present invention;

[0033] Figure 8 It is the partial structural schematic diagram at the ventilation groove of the present invention;

[0034] Figure 9 It is the partial structural schematic diagram at the secondary piston cylinder of the present invention;

[0035] Figure 10 It is the structural schematic diagram at the connection between the elastic sliding plate and the second mounting block of the present invention;

[0036] Figure 11 This is a schematic structural view of the connection column in the present invention;

[0037] Figure 12 This is a schematic structural view of the extrusion block in the present invention.

[0038] The reference numerals in the figure respectively represent: 1, housing; 2, support box; 3, U-shaped detection coil; 4, spraying assembly; 5, clamping and flipping member; 51, first mounting block; 52, hydraulic telescopic rod; 53, flipping assembly; 530, extrusion block; 531, first connecting block; 532, rotating rod; 533, second mounting block; 534, elastic sliding plate; 535, connecting frame; 536, rectangular baffle; 537, triangular baffle; 538, connecting plate; 539, limiting rod; 5310, torsion spring; 5311, connecting column; 5312, second connecting block; 54, clamping assembly; 541, main piston cylinder; 542, main piston rod; 543, clamping frame; 544, limiting groove; 545, clamping plate; 546, ventilation groove; 547, main spring; 548, secondary piston rod; 549, secondary piston cylinder; 5410, secondary spring; 5411, connecting pipe; 5412, first elastic airbag; 55, driving assembly; 551, second elastic airbag; 552, air delivery pipe; 553, annular groove; 554, communication groove; 555, buffer airbag; 56, trapezoidal slider; 57, trapezoidal sliding groove. Detailed implementation manners

[0039] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0040] The present invention will be further described below with reference to the embodiments.

[0041] Embodiment: Refer to Figures 1 to 12, a helicopter blade fatigue detection device, comprising a housing 1, a U-shaped detection coil 3 arranged in the middle of the inner top surface of the housing 1, a support box 2 arranged inside the housing 1 at a position corresponding to the U-shaped detection coil 3, and a spraying assembly 4 arranged on the top of the housing 1. It further includes two clamping and flipping members 5 arranged on both sides of the inner bottom surface of the housing 1 near the U-shaped detection coil 3. The clamping and flipping member 5 includes first mounting blocks 51 symmetrically and fixedly installed on both sides of the U-shaped detection coil 3. A hydraulic telescopic rod 52 is installed on the top surface of the first mounting block 51. The output end of the hydraulic telescopic rod 52 is connected with a flipping assembly 53 for driving the blade to perform flipping work through a trapezoidal slider 56. The trapezoidal slider 56 is slidably connected with the hydraulic telescopic rod 52 through a trapezoidal chute 57. A clamping assembly 54 cooperating with the flipping assembly 53 is arranged inside the housing 1. A driving assembly 55 for driving the clamping assembly 54 to work is arranged inside the first mounting block 51;

[0042] Among them, the clamping assembly 54 includes a main piston cylinder 541 arranged inside the housing 1 at a position corresponding to the flipping assembly 53. A main piston rod 542 is elastically slidably connected inside the main piston cylinder 541 through a main spring 547. The connecting end of the main piston rod 542 is connected with a clamping frame 543. Clamping plates 545 are arranged on both inner side surfaces of the clamping frame 543. A limiting groove 544 is opened in the middle of the inner surface of the clamping frame 543 close to the main piston rod 542.

[0043] When it is necessary to detect the defects of the helicopter blade, first, place the blade to be detected vertically in the groove on the support box 2. It should be noted that an elastic pre-limiting airbag is arranged in the groove on the support box 2. After the operator places the blade in the groove on the support box 2 against the elastic force of the elastic pre-limiting airbag, the elastic pre-limiting airbag can pre-fix the blade, and the elastic pre-limiting airbag can better adapt to the blade surface and improve the pre-fixing effect on the blade.

[0044] Furthermore, start the U-shaped detection coil 3, perform magnetization work on the detection part, and at the same time, drive the spraying assembly 4 to work to spray the magnetic suspension liquid on the blade surface.

[0045] Further, after the above work is completed, the driving hydraulic system drives the hydraulic telescopic rod 52 to start working. This is a conventional technical means in the prior art, so it will not be elaborated here. The output end of the hydraulic telescopic rod 52 drives the trapezoidal slider 56 to move upward inside the trapezoidal chute 57. During the movement of the trapezoidal slider 56, the driving component 55 generates a gas power source. It should be noted that when the trapezoidal slider 56 moves upward, it will also drive the main piston cylinder 541 and the clamping bracket 543 to move upward until the hydraulic telescopic rod 52 stops working first when the clamping bracket 543 moves to a position close to the middle of the blade. Further, the gas power source generated by the driving component 55 enters the inside of the main piston cylinder 541. After the gas power source enters the inside of the main piston cylinder 541, it gradually squeezes the end face of the main piston rod 542. The squeezing force causes the main piston rod 542 to overcome the elastic force of the main spring 547 and drive the clamping bracket 543 to move towards the blade until the end of the blade enters the inside of the limiting groove 544. When both ends of the blade come into contact with the side surfaces of the limiting groove 544, the two clamping brackets 543 complete the fixing work of the blade by squeezing the two ends of the blade.

[0046] The driving component 55 includes a second elastic airbag 551 connected to the upper part of the trapezoidal slider 56 inside the trapezoidal chute 57. A buffer airbag 555 is installed on the side surface of the first mounting block 51 corresponding to the position of the second elastic airbag 551. The second elastic airbag 551 and the buffer airbag 555 are connected through a pipeline. An air delivery pipe 552 penetrates through the inner side surface of the buffer airbag 555.

[0047] It should be noted that during the upward movement of the trapezoidal slider 56, the trapezoidal slider 56 gradually squeezes the main piston cylinder 541. The squeezing force causes the gas inside the main piston cylinder 541 to enter the inside of the buffer airbag 555 through the pipeline. The gas entering the inside of the buffer airbag 555 then enters the inside of the main piston cylinder 541 through the air delivery pipe 552. It should be noted that the inner diameter of the pipeline connecting the second elastic airbag 551 and the buffer airbag 555 is larger than the inner diameter of the air delivery pipe 552. By controlling the above parameters, the purpose of making the amount of gas entering the buffer airbag 555 per unit time greater than the amount of gas discharged through the air delivery pipe 552 per unit time is achieved. This is a conventional technical means in the prior art, so it will not be elaborated here to ensure the elastic deformation speed of the buffer airbag 555.

[0048] The flipping component 53 includes a first connection block 531 fixedly connected to the side of the first mounting block 51 corresponding to the position of the main piston cylinder 541. A rotating rod 532 is rotatably connected to the middle of the first connection block 531. The rotating rod 532 is connected to the main piston cylinder 541. An extrusion block 530 is fixedly connected to the outer circumferential surface of the rotating rod 532 near the main piston cylinder 541. A second mounting block 533 is fixedly installed on the inner side surface of the housing 1 corresponding to the position of the extrusion block 530. An elastic sliding plate 534 is slidably connected inside the second mounting block 533. Both ends of the elastic sliding plate 534 are connected with rectangular baffles 536 through connecting frames 535. A triangular baffle 537 is installed in the middle of the top surface of the elastic sliding plate 534.

[0049] The clamping component 4 further includes a ventilation groove 546 formed in the middle of the main piston rod 542. Secondary piston cylinders 549 are installed on the inner side surfaces of both sides of the main piston rod 542. A secondary piston rod 548 is elastically slidably connected inside the secondary piston cylinder 549 through a secondary spring 5410. The connecting end of the secondary piston rod 548 is connected to the clamping plate 545. A connecting pipe 5411 for communicating with the ventilation groove 546 is penetrated and connected inside the secondary piston cylinder 549.

[0050] Furthermore, during the process of the trapezoidal slider 56 squeezing the second elastic airbag 551, most of the gas inside the second elastic airbag 551 will first enter the inside of the buffer airbag 555, causing the buffer airbag 555 to expand. The buffer airbag 555 achieves the effect of buffering the gas. Therefore, after the initial movement of the trapezoidal slider 56 is completed, most of the gas generated by the trapezoidal slider 56 squeezing the second elastic airbag 551 will first enter the inside of the buffer airbag 555. When the position of the clamping frame 543 corresponds to the middle part of the blade, the elastic force of the buffer airbag 555 recovering its elastic deformation causes the gas inside the buffer airbag 555 to enter the inside of the main piston cylinder 541. As the amount of gas inside the main piston cylinder 541 gradually increases, the extrusion force of the gas on the end face of the main piston rod 542 gradually increases. With the increase of the gas extrusion force, under the action of the gas extrusion force, the main piston rod 542 moves to drive the clamping frame 543 to complete the fixing work of the blade. Furthermore, when the clamping frame 543 moves upward to a position close to the middle of the blade, it will then move towards the blade to complete the fixing work of the blade end face, thereby ensuring the limiting and fixing effect on the blade. It should be noted that the elastic force required for the buffer airbag 555 to undergo elastic deformation is greater than the elastic force required for the main spring 547 to undergo elastic deformation. The elastic force required for the main spring 547 to undergo elastic deformation is less than the elastic force required for the secondary spring 5410 to undergo elastic deformation. The elastic force required for the buffer airbag 555 to undergo elastic deformation is greater than the elastic force required for the secondary spring 5410 to undergo elastic deformation. The magnitudes of the elastic forces required for the buffer airbag 555, the main spring 547, and the secondary spring 5410 to undergo elastic deformation can be controlled according to dimensions, materials, etc. This is a conventional technical means in the prior art, so it will not be elaborated here. Furthermore, it is ensured that the extrusion force of the gas inside the buffer airbag 555 entering the inside of the main piston cylinder 541 during the subsequent process is sufficient to drive the main piston rod 542 to move, ensuring the smoothness of the above work.

[0051] Further, after the above work is completed, continue to start the hydraulic telescopic rod 52 to work. As the hydraulic telescopic rod 52 moves upward, the extrusion force of the two clamping frames 543 on the blade drives the blade to move upward. It should be noted that the amount of gas generated by squeezing the second elastic airbag 551 is set according to the weight of the blade, thereby ensuring sufficient gas driving force and ensuring the clamping and fixing effect on the blade. This is a conventional technical means in the prior art, so it will not be elaborated here.

[0052] Further, as the hydraulic telescopic rod 52 continues to move upward, the extrusion amount of the trapezoidal slider 56 on the second elastic airbag 551 gradually increases, the amount of gas entering the main piston cylinder 541 increases, and the amount of gas entering the secondary piston cylinder 549 through the connecting pipe 5411 gradually increases. The gas extrusion force gradually drives the secondary piston rod 548 to overcome the elastic force of the secondary spring 5410 and drive the clamping plate 545 to move towards the blade, gradually squeezing the blade and clamping and fixing the side surface of the blade, further improving the fixing effect on the blade.

[0053] Further, after the first connecting block 531 drives the extrusion block 530 to move to a position close to the rectangular baffle 536, as the first connecting block 531 continues to move, the extrusion block 530 includes two cylinders arranged in a ring, and the angle between the two cylinders is 120 degrees. One of the rectangular baffles 536 gradually squeezes one of the cylinders on the extrusion block 530. Under the action of the extrusion force, the squeezed cylinder gradually rotates, thereby driving the rotating rod 532 to rotate. The rotating rod 532 drives the blade to rotate 180 degrees. After the blade rotation work is completed, the hydraulic telescopic rod 52 gradually drives the blade and the extrusion block 530 to move downward through the clamping assembly 54. During the downward movement of the extrusion block 530, one of the cylinders squeezes one inclined surface of the triangular baffle 537, realizing the lateral displacement of the elastic sliding plate 534. In this way, when the extrusion block 530 moves upward next time, the other cylinder will squeeze with the other rectangular baffle 536, realizing the rotation of the rotating rod 532, and then realizing the cyclic rotation work, ensuring the continuity of the work. At the same time, during the flipping process of the blade gradually moving towards the spraying assembly, the spraying effect of the spraying assembly is ensured, ensuring that the magnetic suspension liquid can be better sprayed onto the blade surface.

[0054] It should be noted that during the process of driving the blade to move downward, since the elastic force required for the main spring 547 to undergo elastic deformation is less than the elastic force required for the secondary spring 5410 to undergo elastic deformation, under the elastic force of the secondary spring 5410 recovering from elastic deformation, the gas inside the connecting pipe 5411 will first return to the inside of the buffer airbag 555. Under the elastic force of the secondary spring 5410 recovering from elastic deformation, the secondary piston rod 548 will first drive the clamping plate 545 to move away from the blade, canceling the fixing work on the side surface of the blade.

[0055] Furthermore, during the operation of the detection device, the two end faces of the blade will be clamped and fixed by two clamping brackets 543 first, thus completing the fixing work of the blade. As the work progresses, the clamping plate 545 gradually fixes the side of the blade to ensure the clamping effect on the blade when the blade needs to rotate. After the blade completes the rotation work, the clamping plate 545 gradually cancels the clamping work on the side of the blade to ensure that the magnetic suspension liquid can fully cover the surface of the blade and ensure the detection effect of the clamped part of the blade. It should be noted that at this time, the end face of the blade will still be clamped to avoid the problems that the blade is prone to fall or shift under the action of centrifugal force during the rotating flaw detection and the clamped position is difficult to be fully covered when spraying the magnetic suspension liquid, ensuring the detection effect on the blade. Furthermore, it is possible to observe whether the magnetic suspension liquid accumulates on the surface of the blade to judge whether there are defects on the surface of the blade.

[0056] It should be noted that the above components are all made of non-magnetic materials to ensure the effect of magnetic particle detection.

[0057] Refer to Figure 7 , an annular groove 553 is formed on the outer side of the inner part of the flipping assembly 53 close to the rotating rod 532. The annular groove 553 is connected to the buffer airbag 555 through an air delivery pipe 552. A communication groove 554 is formed on the annular side surface of the rotating rod 532 corresponding to the position of the air delivery pipe 552. The annular groove 553 is connected to the inside of the main piston cylinder 541 through the communication groove 554. By providing the communication groove 554, it is ensured that the gas can still flow normally during the rotation of the rotating rod 532.

[0058] Refer to Figure 4 And Figures 10 to 11 , the flipping assembly 53 further includes two limiting rods 539 corresponding to the lower part of the rotating rod 532 on the side of the first connection block 531 away from the main piston cylinder 541. The limiting rods 539 are symmetrically arranged horizontally with respect to the rotating rod 532. A connecting plate 538 is connected to the annular outer side surface of the rotating rod 532. By arranging the limiting rods 539 symmetrically horizontally with respect to the rotating rod 532, the rotation of the rotating rod 532 is restricted by the limiting rods 539 through the connecting plate 538, ensuring that the rotating rod 532 can stably rotate 180 degrees.

[0059] Refer to Figure 4 And Figures 10 to 11, a second connecting block 5312 is installed on the lower surface of the trapezoidal slider 56. A connecting column 5311 is connected to the side of the second connecting block 5312 close to the connecting plate 538. The connecting column 5311 and the connecting plate 538 are elastically connected by a torsion spring 5310. By setting the torsion spring 5310, using the pulling force generated by the torsion spring 5310 on the connecting plate 538, on the one hand, it avoids the problem that the rotating rod 532 drives the blade to rotate when the blade moves upward. On the other hand, when the cylinder on the extrusion block 530 presses against the rectangular baffle 536, the pulling force generated by the torsion spring 5310 on the connecting plate 538 speeds up the rotation speed of the extrusion block 530, and then the blade rotates quickly and turns.

[0060] Refer to Figure 6 , a first elastic airbag 5412 is arranged on the extrusion surface of the clamping plate 545. When the first elastic airbag 5412 presses against the blade, it can undergo elastic deformation, and thus better fit the side surface of the blade. At the same time, it increases the friction force between the clamping plate 545 and the blade, and further increases the fixing effect of the clamping plate 545 on the blade, ensuring the stability during the movement or rotation of the blade.

[0061] Refer to Figures 5 to 9 , the inner diameter of the communication groove 554 is larger than the inner diameter of the ventilation groove 546, ensuring the amount of gas entering the main piston cylinder 541, and thus ensuring sufficient gas driving force.

[0062] A usage method of a helicopter blade fatigue detection device includes the following steps:

[0063] S1: Vertically place the blade to be detected inside the groove on the support box 2;

[0064] S2: Start the U-shaped detection coil 3 and perform magnetization work on the detection part;

[0065] S3: Drive the spray component 4 to work, spray magnetic suspension liquid on the surface of the blade, and then clamp and fix the two end faces of the blade through two clamping frames 543, thus completing the clamping and fixing work on both ends of the blade;

[0066] S4: As the work progresses, the clamping plate 545 gradually fixes the side surface of the blade. When the blade completes the rotation work, the clamping plate 545 gradually cancels the clamping work on the side surface of the blade, and the magnetic suspension liquid is sprayed onto the clamped part of the side surface of the blade;

[0067] S5: Observe whether the magnetic suspension liquid accumulates on the surface of the blade, and thus judge whether there are defects on the surface of the blade.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A helicopter blade fatigue detection device, comprising a housing (1) and a U-shaped detection coil (3) arranged in the middle of the inner top surface of the housing (1), characterized in that, It further includes: Two groups of clamping and flipping members (5) arranged on both sides of the inner bottom surface of the housing (1) close to the U-shaped detection coil (3). The clamping and flipping members (5) include first mounting blocks (51) symmetrically mounted on both sides of the U-shaped detection coil (3). A hydraulic telescopic rod (52) is mounted on the top surface of the first mounting block (51). The output end of the hydraulic telescopic rod (52) is connected to a flipping assembly (53) for driving the blade to flip through a trapezoidal slider (56). The trapezoidal slider (56) is slidably connected to the hydraulic telescopic rod (52) through a trapezoidal chute (57). A clamping assembly (54) cooperating with the flipping assembly (53) is arranged inside the housing (1). A driving assembly (55) for driving the clamping assembly (54) to work is arranged inside the first mounting block (51). Among them, the clamping assembly (54) includes a main piston cylinder (541) arranged inside the housing (1) corresponding to the position of the flipping assembly (53). A main piston rod (542) is elastically slidably connected inside the main piston cylinder (541) through a main spring (547). A clamping frame (543) is connected to the connecting end of the main piston rod (542). The clamping assembly (54) further includes a ventilation groove (546) opened in the middle of the main piston rod (542). Secondary piston cylinders (549) are mounted on both inner surfaces of the main piston rod (542). A secondary piston rod (548) is elastically slidably connected inside the secondary piston cylinder (549) through a secondary spring (5410). The connecting end of the secondary piston rod (548) is connected to a clamping plate (545). A connecting pipe (5411) for communicating with the ventilation groove (546) is penetrated and connected inside the secondary piston cylinder (549). Clamping plates (545) are arranged on both inner side surfaces of the clamping frame (543). A limiting groove (544) is opened in the middle of the inner surface of the clamping frame (543) close to the main piston rod (542). The elastic force generated by the elastic deformation of the main spring (547) is less than the elastic force generated by the elastic deformation of the secondary spring (5410). The driving assembly (55) includes a second elastic airbag (551) connected to the upper part of the trapezoidal slider (56) inside the trapezoidal chute (57). A buffer airbag (555) is mounted on the side surface of the first mounting block (51) corresponding to the position of the second elastic airbag (551). The second elastic airbag (551) is communicated with the buffer airbag (555) through a pipeline. An air delivery pipe (552) is penetrated and connected to the inner side surface of the buffer airbag (555). An annular groove (553) is opened outside the rotating rod (532) inside the flipping assembly (53). The annular groove (553) is communicated with the buffer airbag (555) through the air delivery pipe (552). A communication groove (554) is opened on the annular side surface of the rotating rod (532) corresponding to the position of the air delivery pipe (552). The annular groove (553) is communicated with the inside of the main piston cylinder (541) through the communication groove (554).

2. The fatigue detection device for a helicopter blade according to claim 1, wherein, The flipping assembly (53) includes a first connecting block (531) fixedly connected to the side of the first mounting block (51) corresponding to the position of the main piston cylinder (541). A rotating rod (532) is rotatably connected to the middle of the first connecting block (531). The rotating rod (532) is connected to the main piston cylinder (541). An extrusion block (530) is fixedly connected to the outer circumferential surface of the rotating rod (532) near the main piston cylinder (541). A second mounting block (533) is fixedly installed on the inner side surface of the housing (1) corresponding to the position of the extrusion block (530). An elastic sliding plate (534) is slidably connected inside the second mounting block (533). Both ends of the elastic sliding plate (534) are connected with rectangular baffles (536) through connecting frames (535). A triangular baffle (537) is installed in the middle of the top surface of the elastic sliding plate (534).

3. The fatigue detection device for a helicopter blade according to claim 1, characterized in that, The flipping assembly (53) further includes two limiting rods (539) corresponding to the lower part of the rotating rod (532) on the side of the first connecting block (531) away from the main piston cylinder (541). The limiting rods (539) are horizontally symmetrically arranged with respect to the rotating rod (532). A connecting plate (538) is connected to the outer circumferential surface of the rotating rod (53).

4. The helicopter blade fatigue detection device according to claim 3, wherein A second connecting block (5312) is installed on the lower surface of the trapezoidal slider (56). A connecting column (5311) is connected to the side of the second connecting block (5312) close to the connecting plate (538). The connecting column (5311) and the connecting plate (538) are elastically connected by a torsion spring (5).

5. The fatigue detection device for a helicopter blade according to claim 1, characterized in that, A first elastic airbag (5412) is arranged on the extrusion surface of the clamping plate (545).

6. The fatigue detection device for a helicopter blade according to claim 1, characterized in that, The inner diameter of the communication groove (554) is larger than the inner diameter of the ventilation groove (546).

7. A method of using a helicopter blade fatigue detection device applicable to the one described in claim 1 above, characterized in that, It includes the following steps: S1: Vertically place the blade to be detected inside the groove on the support box (2). S2: Start the U-shaped detection coil (3) and magnetize the detection part. S3: Drive the spraying assembly (4) to work, spray the magnetic suspension liquid on the surface of the blade, and then clamp and fix the two end faces of the blade through two clamping frames (543), thereby completing the clamping and fixing work on both ends of the blade. S4: As the work progresses, the clamping plate (545) gradually fixes the side surface of the blade. When the blade completes the rotation work, the clamping plate (545) gradually cancels the clamping work on the side surface of the blade, and the magnetic suspension liquid is sprayed onto the clamped part of the side surface of the blade. S5: Observe whether the magnetic suspension liquid accumulates on the surface of the blade, and then judge whether there are defects on the surface of the blade.

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