Large-capacity offshore wind turbine generator blade fatigue load detection device

Abstract

The invention discloses a large-capacity offshore wind turbine generator blade fatigue load detection device, and relates to the technical field of wind turbine generator blade fatigue load detection.The large-capacity offshore wind turbine generator blade fatigue load detection device comprises a detection table, the side wall of the detection table is symmetrically and fixedly connected with two mounting plates, and the ends, close to each other, of the two mounting plates are jointly and rotationally connected with a mounting rod; the upper end of the mounting rod penetrates through the upper end of the mounting plate and is fixedly connected with a fixed cylinder; the swinging mechanism comprises a first rotating shaft rotationally connected to the side wall of the detection table, one end of the first rotating shaft is fixedly connected with a first one-way bearing, the other end of the first one-way bearing is fixedly connected with a second one-way bearing, and the other end of the second one-way bearing is fixedly connected with a second rotating shaft. Fatigue load detection is carried out on the offshore wind power blade by simulating the real operation state and environment of the offshore wind power blade, and compared with existing data collection and detection only through pressure application, the result is more accurate and more real.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine blade fatigue load detection, and in particular to a large-capacity offshore wind turbine blade fatigue load detection device. Background Art

[0002] The rotor blades are the most critical components of a wind turbine. The blades are made of multiple layers of glass fiber reinforced plastic. Due to the force characteristics of the blades and process limitations, a lot of manual work is required in the blade laying process, which inevitably leads to unstable quality. On the other hand, considering the production cost and the cost recovery period of the wind turbine, the blades need to work stably within a life cycle of at least 20 years, so the fatigue test of the blades is very important.

[0003] At present, the fatigue load detection of wind turbine blades usually involves setting a counterweight on the wind turbine blades, and measuring the deviation and force of the blades under the support of the counterweight. Although this method can detect the approximate data of the blade fatigue load, it does not conform to the actual working state of the wind turbine blades, so the error of the detected data is relatively large. In addition, when the wind turbine blades are actually working, the operation of the wind turbine will generate vibration, which will also have a certain impact on the actual fatigue load of the blades.

[0004] Based on this, we propose a large-capacity offshore wind turbine blade fatigue load detection device. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a large-capacity offshore wind turbine blade fatigue load detection device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A large-capacity offshore wind turbine blade fatigue load detection device comprises a detection platform, the side wall of the detection platform is symmetrically fixedly connected with two mounting plates, the ends of the two mounting plates close to each other are rotatably connected with a mounting rod, the upper end of the mounting rod passes through the upper end of the mounting plate and is fixedly connected with a fixing cylinder; The swing mechanism includes a first rotating shaft rotatably connected to the side wall of the detection platform, one end of the first rotating shaft is fixedly connected to a first one-way bearing, the other end of the first one-way bearing is fixedly connected to a second one-way bearing, the other end of the second one-way bearing is fixedly connected to a second rotating shaft, the side wall of the second rotating shaft is fixedly connected to an arc-shaped connecting rod, the side wall of the mounting rod is fixedly connected to a fixed block, the side wall of the fixed block is rotatably connected to a U-shaped connecting seat through a pin shaft, the other end of the arc-shaped connecting rod is rotatably connected to the U-shaped connecting seat, the side wall of the detection platform is fixedly connected to a motor, and the output end of the motor passes through the side wall of the detection platform and is fixedly connected to the first rotating shaft.

[0007] Preferably, a vibration mechanism is installed on the detection platform, and the vibration mechanism includes a slide groove opened on the upper end of the detection platform, a slider is slidably connected to the inner wall of the slide groove, an arc block is fixedly connected to the upper end of the slider, an arc groove is opened on the upper end of the arc block, a fixed plate is slidably connected to the inner wall of the arc groove, and an annular seat is fixedly connected to the upper end of the fixed plate.

[0008] Preferably, the vibration mechanism also includes a plurality of magnetic rods slidably connected to the inner wall of the annular seat, one end of the magnetic rod is fixedly connected to a striking head, an annular groove is provided in the annular seat, the other ends of the plurality of magnetic rods extend into the annular groove, and the side walls of the plurality of magnetic rods are sleeved with a plurality of first springs, the two ends of the first springs are respectively fixedly connected to the magnetic rods and the inner wall of the annular groove, and the stiffness coefficients of the plurality of first springs are different.

[0009] Preferably, a power mechanism is installed in the annular seat, and the power mechanism includes a plurality of cavities opened in the annular seat, and the plurality of cavities are arranged in one-to-one correspondence with a plurality of magnetic rods, a rotating rod is rotatably connected to the inner wall of the cavity, and a plurality of fan blades are fixedly connected to the side wall of the rotating rod, one of the fan blades is made of magnetic material, and a torsion spring is provided in a fixed sleeve on the side wall of the rotating rod, and one end of the torsion spring is fixedly connected to the inner wall of the cavity.

[0010] Preferably, the power mechanism also includes two airbags symmetrically fixedly connected to the inner wall of the arc groove, the other ends of the two airbags are fixedly connected to the side wall of the fixed plate, the inner wall of the airbag is fixedly connected with a one-way air inlet pipe, and the airbag is connected to multiple cavities through a one-way air supply pipe.

[0011] Preferably, a driving mechanism is installed in the slide groove, and the driving mechanism includes a reciprocating screw rotatably connected to the inner wall of the slide groove, the side wall of the reciprocating screw is threadedly connected to the slider, the side wall of the first one-way bearing is fixedly connected to a driving wheel, the side wall of the reciprocating screw is fixedly connected to a driven wheel, and the driving wheel is connected to the driven wheel through a synchronous belt.

[0012] Preferably, a pressure mechanism is installed on the slider, and the pressure mechanism includes two L-shaped frames symmetrically fixedly connected to the side walls of the slider, and the side walls of the two L-shaped frames close to each other are fixedly connected to a slide cylinder, the inner wall of the slide cylinder is sealingly and slidably connected to a slide plug, the inner wall of the slide cylinder is slidably connected to a slide rod, the other end of the slide rod passes through the side wall of the slide cylinder and is fixedly connected to a pressure plate, and a second spring is fixedly connected between the slide rod and the slide plug.

[0013] Preferably, the pressure mechanism also includes an air storage box fixedly connected to the lower end of the detection platform, the inner wall of the air storage box is sealingly and slidably connected with a slide plate, the air storage box is connected to the slide cylinder through a connecting pipe, the side wall of the slider is fixedly connected with a fixing rod, and the other end of the fixing rod passes through the side wall of the air storage box and is fixedly connected to the slide plate.

[0014] Preferably, two electric push rods are symmetrically fixedly connected to the side wall of the fixed cylinder, and the movable ends of the two electric push rods both penetrate the inner wall of the fixed cylinder and are fixedly connected to a clamping plate.

[0015] Preferably, the inner walls of the plurality of cavities are each provided with an exhaust hole, and the other ends of the plurality of exhaust holes are each connected to the outside.

[0016] The present invention has the following beneficial effects: 1. By setting up a swing mechanism, the motor is driven to rotate in the forward direction, driving the blades to swing back and forth, which can simulate the state of the blades in operation and perform fatigue load detection on them, making the detection results more accurate; 2. By setting a vibration mechanism and a power mechanism, when the blades swing back and forth, they will collide with the annular seat, thereby driving the annular seat to move back and forth, and repeatedly squeeze the air in the airbag into the cavity, driving the fan blades to rotate, so that the knocking head moves back and forth to knock on the blades, causing the blades to vibrate, thereby simulating the vibration generated by the operation of the wind turbine, making the blade fatigue load detection closer to the actual use scenario and the measurement data more accurate; 3. The different stiffness coefficients of the multiple first springs can make the striking head produce different forces when striking the blade, thereby producing different vibration amplitudes, thereby avoiding the same vibration amplitude, so that the vibrations cancel each other out, thereby reducing the amplitude; 4. By setting a pressure mechanism, when the blade swings back and forth and it swings against the pressure plate, it will start to squeeze the pressure plate, and the pressure plate will squeeze the slide bar to make it slide, and the slide bar will further squeeze the second spring, so that the second spring is compressed, and the second spring will give a reaction force, so that the pressure plate applies pressure to the surface of the blade. Due to the high wind speed at sea, the wind force acts on the surface of the blade, which may cause the surface of the blade to deform, and then the fatigue load test can be performed by applying pressure to the surface of the blade to simulate the pressure applied by the sea breeze; 5. By setting a driving mechanism and driving the motor to rotate in the opposite direction, the driving wheel can be driven to rotate, and then the driven wheel can be driven to rotate, and the reciprocating screw can be driven to rotate, and the slider can be driven to slide on the inner wall of the slide groove, and then the annular seat can be driven to move, so that the annular seat moves to different positions of the blade, and vibration tests are performed on different parts of the blade, so as to facilitate the measurement of fatigue loads at different positions of the blade; 6. When the annular seat is closer to the fixed cylinder, due to the characteristics of the blade when it swings, the swing amplitude of the blade part closer to the fixed cylinder is smaller. Therefore, when the blade part at that location is against the pressure plate, the compression amplitude of the second spring is smaller, so the pressure provided by the pressure plate to that location will be smaller, so that when performing fatigue load detection, the pressure applied to different parts of the blade is different, making the pressure a variable, which will affect the numerical value of the test result. Therefore, when the slider drives the annular seat close to the fixed cylinder, the slider will synchronously drive the fixed rod to move, and then drive the slider to move to the left, and then the air in the air storage box will be squeezed into the slide cylinder through the connecting pipe, pushing the two slides to move closer to each other, and then driving the two pressure plates to move closer to each other, so that no matter where the pressure plate is in the blade, the blade will squeeze the pressure plate to move the same distance when it swings, thereby ensuring that the compression amplitude of the second spring is the same, thereby ensuring that the pressure applied to the blade is the same, and ensuring that the pressure is quantitative. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of a large-capacity offshore wind turbine blade fatigue load detection device proposed by the present invention; Figure 2 for Figure 1 A schematic side view of the structure in FIG. Figure 3 for Figure 1 A schematic cross-sectional view of the structure; Figure 4 for Figure 1 A schematic cross-sectional view of the middle annular seat and the slide cylinder; Figure 5 for Figure 3 A schematic diagram of the structure enlargement at point A; Figure 6 for Figure 4 Schematic diagram of the enlarged structure at point B in FIG.

[0018] In the figure: 1, test table; 2, mounting plate; 3, mounting rod; 4, fixing cylinder; 5, first rotating shaft; 6, first one-way bearing; 7, second one-way bearing; 8, second rotating shaft; 9, arc connecting rod; 10, fixing block; 11, U-shaped connecting seat; 12, slide groove; 13, slider; 14, arc block; 15, arc groove; 16, fixing plate; 17, annular seat; 18, magnetic rod; 19, knocking head; 20, annular groove; 21, first spring; 22, cavity; 23. Rotating rod; 24. Fan blade; 25. Torsion spring; 26. Air bag; 27. One-way air inlet pipe; 28. One-way air supply pipe; 30. Reciprocating screw; 31. Driving wheel; 32. Driven wheel; 33. L-shaped frame; 34. Slide cylinder; 35. Sliding plug; 36. Sliding rod; 37. Pressing plate; 38. Second spring; 39. Air storage box; 40. Slide plate; 41. Connecting pipe; 42. Fixed rod; 43. Electric push rod; 44. Clamping plate; 45. Motor; 46. Exhaust hole. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0020] Reference Figure 1 - Figure 6 A large-capacity offshore wind turbine blade fatigue load detection device comprises a detection platform 1, the side wall of the detection platform 1 is symmetrically fixedly connected with two mounting plates 2, the ends of the two mounting plates 2 close to each other are rotatably connected with a mounting rod 3, the upper end of the mounting rod 3 passes through the upper end of the mounting plate 2 and is fixedly connected with a fixing cylinder 4, the side wall of the fixing cylinder 4 is symmetrically fixedly connected with two electric push rods 43, the movable ends of the two electric push rods 43 both pass through the inner wall of the fixing cylinder 4 and are fixedly connected with a clamping plate 44; The swing mechanism includes a first rotating shaft 5 rotatably connected to the side wall of the detection platform 1, one end of the first rotating shaft 5 is fixedly connected to the first one-way bearing 6, the inner ring of the first one-way bearing 6 is fixedly connected to the second one-way bearing 7, the inner ring of the second one-way bearing 7 is fixedly connected to the second rotating shaft 8, the side wall of the second rotating shaft 8 is fixedly connected to an arc-shaped connecting rod 9, the side wall of the mounting rod 3 is fixedly connected to a fixed block 10, the side wall of the fixed block 10 is rotatably connected to a U-shaped connecting seat 11 through a pin shaft, the other end of the arc-shaped connecting rod 9 is rotatably connected to the U-shaped connecting seat 11, the side wall of the detection platform 1 is fixedly connected to a motor 45, and the output end of the motor 45 passes through the side wall of the detection platform 1 and is fixedly connected to the first rotating shaft 5.

[0021] It should be noted that the first one-way bearing 6 and the second one-way bearing 7 are arranged in opposite directions, the first rotating shaft 5 is fixedly connected to the inner ring of the first one-way bearing 6, the outer ring of the second one-way bearing 7 is fixedly connected to the inner ring of the first one-way bearing 6, and the second rotating shaft 8 is fixedly connected to the inner ring of the second one-way bearing 7. When the motor 45 rotates forward, it can drive the second rotating shaft 8 to rotate. When the motor 45 rotates reversely, the second rotating shaft 8 does not rotate.

[0022] Furthermore, the electric push rod 43 is driven to extend, driving the clamping plate 44 to clamp and fix the blades, and then the motor 45 is driven to rotate forward, driving the second rotating shaft 8 to rotate, and then driving the arc-shaped connecting rod 9 to rotate. The arc-shaped connecting rod 9 will drive the fixing block 10 to rotate forward and backward through the U-shaped connecting seat 11, and then drive the mounting rod 3 to rotate forward and backward alternately, drive the fixing tube 4 to swing back and forth, and then drive the blades to swing back and forth, which can simulate the state of the blades during operation, and perform fatigue load testing on them, and the test results are more accurate.

[0023] A vibration mechanism is installed on the detection table 1, and the vibration mechanism includes a slide groove 12 opened at the upper end of the detection table 1, a slider 13 is slidably connected to the inner wall of the slide groove 12, an arc block 14 is fixedly connected to the upper end of the slider 13, an arc groove 15 is opened at the upper end of the arc block 14, a fixed plate 16 is slidably connected to the inner wall of the arc groove 15, and an annular seat 17 is fixedly connected to the upper end of the fixed plate 16.

[0024] The vibration mechanism also includes a plurality of magnetic rods 18 slidably connected to the inner wall of the annular seat 17, a striking head 19 is fixedly connected to one end of the magnetic rod 18, an annular groove 20 is opened in the annular seat 17, the other ends of the plurality of magnetic rods 18 are extended into the annular groove 20, a plurality of first springs 21 are sleeved on the side walls of the plurality of magnetic rods 18, the two ends of the first springs 21 are respectively fixedly connected to the magnetic rods 18 and the inner wall of the annular groove 20, and the stiffness coefficients of the plurality of first springs 21 are different.

[0025] It should be noted that the different stiffness coefficients of the multiple first springs 21 can cause different forces generated when the striking head 19 strikes the blade, thereby generating different vibration amplitudes, avoiding the same vibration amplitude, so that the vibrations cancel each other out and thus reducing the amplitude.

[0026] A power mechanism is installed in the annular seat 17, and the power mechanism includes multiple cavities 22 opened in the annular seat 17, and the multiple cavities 22 are arranged in a one-to-one correspondence with the multiple magnetic rods 18. The inner wall of the cavity 22 is rotatably connected to a rotating rod 23, and the side wall of the rotating rod 23 is fixedly connected to multiple fan blades 24, one of which is made of magnetic material. A torsion spring 25 is fixedly sleeved on the side wall of the rotating rod 23, and one end of the torsion spring 25 is fixedly connected to the inner wall of the cavity 22. Exhaust holes 46 are opened on the inner walls of the multiple cavities 22, and the other ends of the multiple exhaust holes 46 are connected to the outside, so that the air in the cavity 22 will be discharged through the exhaust holes 46.

[0027] The power mechanism also includes two air bags 26 symmetrically fixedly connected to the inner wall of the arc groove 15, the other ends of the two air bags 26 are fixedly connected to the side wall of the fixed plate 16, and the inner wall of the air bag 26 is fixedly connected with a one-way air intake pipe 27, which only allows external air to enter the air bag 26. The air bag 26 is connected to multiple cavities 22 through a one-way air supply pipe 28, which only allows the air in the air bag 26 to enter the cavity 22, and the one-way air supply pipe 28 is made of a hose.

[0028] Furthermore, when the blades swing back and forth, they will abut against the annular seat 17, thereby driving the annular seat 17 to move back and forth, driving the fixing plate 16 to slide back and forth on the inner wall of the arc groove 15, and the fixing plate 16 will repeatedly squeeze and stretch the two air bags 26 at the same time. The air bags 26 will inhale external air through the one-way air inlet pipe 27, and then squeeze the air into the cavity 22 through the one-way air supply pipe 28. The airflow will blow the multiple blades 24 to rotate. Since one of the blades 24 is made of magnetic material, when the blade 24 rotates to the magnetic rod 18, the blade 24 will rotate to the magnetic rod 18. When relative to each other, the magnetic repulsion force will push the magnetic rod 18 to move, and then drive the knocking head 19 to move, and the knocking head 19 will hit the blade. When the magnetic fan blade 24 rotates away from the magnetic rod 18, the magnetic rod 18 will reset under the action of the first spring 21, and then the magnetic rod 18 can drive the knocking head 19 to move back and forth, constantly knocking on the surface of the blade, causing the blade to vibrate, and then can simulate the vibration generated during the operation of the wind turbine, so that the blade fatigue load detection is closer to the actual use scenario, and the measurement data is more accurate and consistent.

[0029] A driving mechanism is installed in the slide groove 12, and the driving mechanism includes a reciprocating screw 30 rotatably connected to the inner wall of the slide groove 12, the side wall of the reciprocating screw 30 is threadedly connected to the slider 13, the side wall of the first one-way bearing 6 is fixedly connected to a driving wheel 31, the side wall of the reciprocating screw 30 is fixedly connected to a driven wheel 32, and the driving wheel 31 is connected to the driven wheel 32 through a synchronous belt.

[0030] It should be noted that the driving wheel 31 is fixedly connected to the outer ring side wall of the first one-way bearing 6. When the motor 45 rotates in the reverse direction, the driving wheel 31 will rotate, and when the motor 45 rotates in the forward direction, the driving wheel 31 will not rotate.

[0031] Furthermore, by driving the motor 45 to rotate in the opposite direction, the driving wheel 31 can be driven to rotate, and then the driven wheel 32 can be driven to rotate, and the reciprocating screw 30 can be driven to rotate, and the slider 13 can be driven to slide on the inner wall of the slide groove 12, and then the annular seat 17 can be driven to move, so that the annular seat 17 moves to different positions of the blade, and vibration tests are performed on different parts of the blade, thereby facilitating the measurement of fatigue loads at different positions of the blade.

[0032] A pressure mechanism is installed on the slider 13, and the pressure mechanism includes two L-shaped frames 33 symmetrically fixedly connected to the side walls of the slider 13, and the side walls of the two L-shaped frames 33 close to each other are fixedly connected to a slide cylinder 34, and a slide plug 35 is sealingly and slidably connected to the inner wall of the slide cylinder 34, and a slide rod 36 is slidably connected to the inner wall of the slide cylinder 34, and the other end of the slide rod 36 passes through the side wall of the slide cylinder 34 and is fixedly connected to a pressure plate 37, and a second spring 38 is fixedly connected between the slide rod 36 and the slide plug 35.

[0033] Furthermore, when the blade swings back and forth and it swings to abut against the pressure plate 37, it will start to squeeze the pressure plate 37, and the pressure plate 37 will squeeze the slide bar 36 to make it slide, and the slide bar 36 will further squeeze the second spring 38, so that the second spring 38 is compressed, and the second spring 38 will give a reaction force, so that the pressure plate 37 applies pressure to the surface of the blade. Due to the high wind speed at sea, the wind force acting on the surface of the blade may cause the surface of the blade to deform, and then fatigue load detection can be performed by applying pressure to the surface of the blade to simulate the pressure applied by the sea breeze.

[0034] The pressure mechanism also includes an air storage box 39 fixedly connected to the lower end of the detection platform 1, and the inner wall of the air storage box 39 is sealed and slidably connected with a slide plate 40. The air storage box 39 is connected to the slide cylinder 34 through a connecting pipe 41. The side wall of the slider 13 is fixedly connected with a fixing rod 42, and the other end of the fixing rod 42 passes through the side wall of the air storage box 39 and is fixedly connected to the slide plate 40.

[0035] Furthermore, when the annular seat 17 is closer to the fixed cylinder 4, due to the characteristics of the blade swinging, the swing amplitude of the blade portion closer to the fixed cylinder 4 is smaller. Therefore, when the blade portion at this location abuts against the pressure plate 37, the compression amplitude of the second spring 38 is smaller, so that the pressure provided by the pressure plate 37 to this location will be smaller, so that when the fatigue load test is performed, the pressure applied to different parts of the blade is different, making the pressure a variable, which will affect the value of the test result. Therefore, when the slider 13 drives the annular seat 17 to approach the fixed cylinder 4, the slider 13 will synchronously drive the fixed rod 42 to move, and then drive the slide plate 40 to move to the left (as shown in the attached figure). Figure 3 As shown in the figure, the air in the air storage box 39 will be squeezed into the slide cylinder 34 through the connecting pipe 41, pushing the two slide plugs 35 to move closer to each other, thereby driving the two pressure plates 37 to move closer to each other, so that no matter where the pressure plate 37 is in the blade, the blade will squeeze the pressure plate 37 to move the same distance when it swings, thereby ensuring that the compression amplitude of the second spring 38 is the same, thereby ensuring that the pressure applied to the blade is the same, and ensuring that the pressure becomes quantitative.

[0036] It should be noted that this device will set up multiple sensors during fatigue load detection, transmit signals through the sensors, and transmit the detection values ​​to external analysis equipment for analysis, thereby performing fatigue load detection analysis. This is existing technology and will not be elaborated here.

[0037] In the present invention, firstly, one end of the blade is passed through the middle of the annular seat 17 and entered into the fixed cylinder 4, and then the electric push rod 43 is driven to extend, driving the clamping plate 44 to clamp and fix the blade, and then the motor 45 is driven to rotate forward, driving the second rotating shaft 8 to rotate, and then driving the arc-shaped connecting rod 9 to rotate. The arc-shaped connecting rod 9 will drive the fixing block 10 to rotate forward and reverse through the U-shaped connecting seat 11, and then drive the mounting rod 3 to rotate forward and reverse alternately, drive the fixed cylinder 4 to swing back and forth, and then drive the blade to swing back and forth, which can simulate the state of the blade during operation, perform fatigue load detection on it, and the detection result is more accurate.

[0038] When the blades swing back and forth, they will abut against the annular seat 17, thereby driving the annular seat 17 to move back and forth, driving the fixed plate 16 to slide back and forth on the inner wall of the arc groove 15, and the fixed plate 16 will repeatedly squeeze and stretch the two air bags 26 at the same time. The air bags 26 will inhale external air through the one-way air inlet pipe 27, and then squeeze the air into the cavity 22 through the one-way air supply pipe 28. The airflow will blow the multiple blades 24 to rotate. Since one of the blades 24 is made of magnetic material, when the blade 24 rotates to be opposite to the magnetic rod 18, When the magnetic rod 18 is moved due to the magnetic repulsion force, the striking head 19 is driven to move, and the striking head 19 hits the blade. When the magnetic fan blade 24 rotates away from the magnetic rod 18, the magnetic rod 18 is reset under the action of the first spring 21, and the magnetic rod 18 can drive the striking head 19 to move back and forth, continuously striking the surface of the blade, causing the blade to vibrate, thereby simulating the vibration generated during the operation of the wind turbine, so that the fatigue load detection of the blade is closer to the actual use scenario and the measurement data is more accurate and consistent.

[0039] In addition, when the blade swings back and forth and it swings to abut against the pressure plate 37, it will start to squeeze the pressure plate 37, and the pressure plate 37 will squeeze the slide bar 36 to make it slide, and the slide bar 36 will further squeeze the second spring 38, so that the second spring 38 is compressed, and the second spring 38 will give a reaction force, so that the pressure plate 37 applies pressure to the surface of the blade. Due to the high wind speed at sea, the wind force acting on the surface of the blade may cause the surface of the blade to deform, and then fatigue load detection can be performed by applying pressure to the surface of the blade to simulate the pressure applied by the sea breeze.

[0040] By driving the motor 45 to rotate in the opposite direction, the driving wheel 31 can be driven to rotate, and then the driven wheel 32 can be driven to rotate, and the reciprocating screw 30 can be driven to rotate, and the slider 13 can be driven to slide on the inner wall of the slide groove 12, and then the annular seat 17 can be driven to move, so that the annular seat 17 moves to different positions of the blade, and vibration tests are performed on different parts of the blade, thereby facilitating the measurement of fatigue loads at different positions of the blade.

[0041] In addition, when the annular seat 17 is closer to the fixed cylinder 4, due to the characteristics of the blade when it swings, the swing amplitude of the blade part closer to the fixed cylinder 4 is smaller. Therefore, when the blade part at this location abuts against the pressure plate 37, the compression amplitude of the second spring 38 is smaller, so that the pressure provided by the pressure plate 37 to this location will be smaller, so that when the fatigue load test is performed, the pressure applied to different parts of the blade is different, making the pressure a variable, which will affect the value of the test result. Therefore, when the slider 13 drives the annular seat 17 to approach the fixed cylinder 4, the slider 13 will synchronously drive the fixed rod 42 to move, and then drive the slide plate 40 to move to the left (as shown in the attached figure). Figure 3 As shown in the figure, the air in the air storage box 39 will be squeezed into the slide cylinder 34 through the connecting pipe 41, pushing the two slide plugs 35 to move closer to each other, thereby driving the two pressure plates 37 to move closer to each other, so that no matter where the pressure plate 37 is in the blade, the blade will squeeze the pressure plate 37 to move the same distance when it swings, thereby ensuring that the compression amplitude of the second spring 38 is the same, thereby ensuring that the pressure applied to the blade is the same, and ensuring that the pressure becomes quantitative.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A large-capacity offshore wind turbine blade fatigue load detection device, characterized in that: include: A testing platform (1), wherein two mounting plates (2) are symmetrically fixedly connected to the side wall of the testing platform (1), and ends of the two mounting plates (2) close to each other are rotatably connected to a mounting rod (3), and the upper end of the mounting rod (3) passes through the upper end of the mounting plate (2) and is fixedly connected to a fixing cylinder (4); A swing mechanism, the swing mechanism comprising a first rotating shaft (5) rotatably connected to a side wall of a detection platform (1), one end of the first rotating shaft (5) being fixedly connected to a first one-way bearing (6), an inner ring of the first one-way bearing (6) being fixedly connected to a second one-way bearing (7), an inner ring of the second one-way bearing (7) being fixedly connected to a second rotating shaft (8), a side wall of the second rotating shaft (8) being fixedly connected to an arc-shaped connecting rod (9), a side wall of the mounting rod (3) being fixedly connected to a fixing block (10), a side wall of the fixing block (10) being rotatably connected to a U-shaped connecting seat (11) via a pin, the other end of the arc-shaped connecting rod (9) being rotatably connected to the U-shaped connecting seat (11), a motor (45) being fixedly connected to the side wall of the detection platform (1), an output end of the motor (45) passing through the side wall of the detection platform (1) and being fixedly connected to the first rotating shaft (5).

2. A large-capacity offshore wind turbine blade fatigue load detection device according to claim 1, characterized in that: in: A vibration mechanism is installed on the detection platform (1), and the vibration mechanism includes a slide groove (12) opened at the upper end of the detection platform (1), the inner wall of the slide groove (12) is slidably connected to a slider (13), the upper end of the slider (13) is fixedly connected to an arc block (14), the upper end of the arc block (14) is opened with an arc groove (15), the inner wall of the arc groove (15) is slidably connected to a fixed plate (16), and the upper end of the fixed plate (16) is fixedly connected to an annular seat (17).

3. A large-capacity offshore wind turbine blade fatigue load detection device according to claim 2, characterized in that: in: The vibration mechanism further comprises a plurality of magnetic rods (18) slidably connected to the inner wall of the annular seat (17), one end of the magnetic rod (18) being fixedly connected to a striking head (19), an annular groove (20) being provided in the annular seat (17), the other ends of the plurality of magnetic rods (18) all extending into the annular groove (20) for arrangement, a plurality of first springs (21) being sleeved on the side walls of the plurality of magnetic rods (18), the two ends of the first springs (21) being respectively fixedly connected to the magnetic rods (18) and the inner wall of the annular groove (20), and the stiffness coefficients of the plurality of first springs (21) are all different.

4. A large-capacity offshore wind turbine blade fatigue load detection device according to claim 3, characterized in that: in: A power mechanism is installed in the annular seat (17), the power mechanism comprising a plurality of cavities (22) opened in the annular seat (17), and the plurality of cavities (22) are arranged in a one-to-one correspondence with the plurality of magnetic rods (18), the inner wall of the cavity (22) is rotatably connected to a rotating rod (23), the side wall of the rotating rod (23) is fixedly connected to a plurality of blades (24), one of the blades (24) is made of magnetic material, and a torsion spring (25) is fixedly sleeved on the side wall of the rotating rod (23), one end of the torsion spring (25) is fixedly connected to the inner wall of the cavity (22).

5. A large-capacity offshore wind turbine blade fatigue load detection device according to claim 4, characterized in that: in: The power mechanism further comprises two air bags (26) symmetrically fixedly connected to the inner wall of the arc-shaped groove (15), the other ends of the two air bags (26) being fixedly connected to the side wall of the fixing plate (16), the inner wall of the air bag (26) being fixedly connected to a one-way air inlet pipe (27), and the air bag (26) being connected to the plurality of cavities (22) via a one-way air supply pipe (28).

6. A large-capacity offshore wind turbine blade fatigue load detection device according to claim 2, characterized in that: in: A driving mechanism is installed in the slide groove (12), and the driving mechanism includes a reciprocating screw (30) rotatably connected to the inner wall of the slide groove (12), the side wall of the reciprocating screw (30) is threadedly connected to the slider (13), the side wall of the first one-way bearing (6) is fixedly connected to a driving wheel (31), the side wall of the reciprocating screw (30) is fixedly connected to a driven wheel (32), and the driving wheel (31) is connected to the driven wheel (32) via a synchronous belt.

7. A large-capacity offshore wind turbine blade fatigue load detection device according to claim 2, characterized in that: in: The slider (13) is provided with a pressure mechanism, the pressure mechanism comprising two L-shaped frames (33) symmetrically fixedly connected to the side walls of the slider (13), the side walls of the two L-shaped frames (33) close to each other are fixedly connected to a slide cylinder (34), the inner wall of the slide cylinder (34) is sealingly and slidably connected to a slide plug (35), the inner wall of the slide cylinder (34) is slidably connected to a slide rod (36), the other end of the slide rod (36) passes through the side wall of the slide cylinder (34) and is fixedly connected to a pressure plate (37), and a second spring (38) is fixedly connected between the slide rod (36) and the slide plug (35).

8. A large-capacity offshore wind turbine blade fatigue load detection device according to claim 7, characterized in that: in: The pressure mechanism further comprises an air storage box (39) fixedly connected to the lower end of the detection platform (1); the inner wall of the air storage box (39) is sealed and slidably connected to a slide plate (40); the air storage box (39) is connected to the slide cylinder (34) via a connecting pipe (41); a fixing rod (42) is fixedly connected to the side wall of the slide block (13); the other end of the fixing rod (42) passes through the side wall of the air storage box (39) and is fixedly connected to the slide plate (40).

9. A large-capacity offshore wind turbine blade fatigue load detection device according to claim 1, characterized in that: in: Two electric push rods (43) are symmetrically fixedly connected to the side wall of the fixed cylinder (4), and the movable ends of the two electric push rods (43) both penetrate the inner wall of the fixed cylinder (4) and are fixedly connected to a clamping plate (44).

10. A large-capacity offshore wind turbine blade fatigue load detection device according to claim 4, characterized in that: in: The inner walls of the plurality of cavities (22) are each provided with an exhaust hole (46), and the other ends of the plurality of exhaust holes (46) are each connected to the outside.

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