Wind power blade fatigue testing device

Abstract

The invention discloses a wind power blade fatigue test device, and belongs to the technical field of blade fatigue test.The wind power blade fatigue test device comprises a gravity mass block and a blade body, and the blade body is fixedly arranged on the side wall of the gravity mass block; the bottom of one end, far away from the gravity mass block, of the blade body is provided with a mobile test vehicle used for testing the fatigue of the blade body, the bottom of the mobile test vehicle is provided with a plurality of driving wheels, the top of the mobile test vehicle is provided with two clamping arms, the two clamping arms are both C-shaped, and the interior of the rotating box is communicated with the interior of the fixed box. And a reciprocating rotating mechanism for driving the rotating box to rotate is arranged in a communicating space in the rotating box and the fixed box. According to the invention, the movable test vehicle is arranged at the tail end of the blade body, so that the influence of centrifugal force on the blade body can be simulated in the test of the blade body, and the fatigue of the wind power blade in the rotating process can be simulated more accurately.

Description

Technical Field

[0001] The invention belongs to the technical field of blade fatigue testing, and in particular relates to a wind turbine blade fatigue testing device. Background Art

[0002] Wind power, or wind power generation, is a renewable energy technology that uses wind to drive wind turbines to generate electricity. Wind turbine blades are one of the key components of wind turbines and are responsible for converting wind energy into mechanical energy. The design, material selection and manufacturing process of wind turbine blades have a significant impact on their performance and efficiency. Since wind turbine blades are subject to cyclic loads caused by wind during operation, fatigue testing is essential to ensure the safety and reliability of the blades. The main purpose of the test is to detect potential defects and evaluate fatigue life.

[0003] The commonly used test method is the vibration method. The general steps are to install the test piece on the test device, and then fix the vibrator in the middle position of the length direction of the test piece. The vibrator drives the test piece to vibrate at a fixed frequency, and then the staff will measure it. However, most of the current vibrators vibrate in the direction perpendicular to the blade. After the blade is officially installed and operated, in addition to being hindered by wind force, it will also be affected by the centrifugal force during the rotation process. The direction of the force exerted by the centrifugal force on the tail end of the blade is basically in the same plane as the blade, and fatigue testing in this direction is often not given enough attention. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a wind turbine blade fatigue testing device.

[0005] The technical solution adopted to solve the above technical problems is:

[0006] A wind turbine blade fatigue test device comprises a gravity mass block and a blade body, wherein the blade body is fixedly arranged on the side wall of the gravity mass block, a mobile test vehicle for testing the fatigue of the blade body is arranged at the bottom of one end of the blade body away from the gravity mass block, a plurality of running wheels are arranged at the bottom of the mobile test vehicle, and two clamping arms are arranged on the top of the mobile test vehicle, both of which are "C"-shaped, and the side walls on both sides of the end of the blade body away from the gravity mass block are clamped by the two clamping arms;

[0007] The mobile test vehicle is divided into three layers. The top layer is a moving box, and the two clamping arms are located on this layer. The moving box is provided with a clamping mechanism for controlling the movement of the clamping arms. The middle layer is a rotating box, and the rotating box is fixedly connected to the bottom wall of the moving box. The bottom layer is a fixed box, and the bottom wall of the rotating box is rotatably connected to the top of the fixed box. The interior of the rotating box is connected to the interior of the fixed box, and a reciprocating rotating mechanism for driving the rotating box to rotate is installed in the connecting space between the rotating box and the fixed box.

[0008] Through the above technical solution, a mobile test vehicle is set under the tail end of the blade body, so that the test on the blade body can simulate the influence of centrifugal force on it, thereby more accurately simulating the fatigue of the wind turbine blade during rotation.

[0009] Furthermore, a buffer block is fixedly provided on the inner wall of the clamp arm, the side wall of the buffer block abuts against the side wall of the blade body, and the material of the buffer block is isoprene rubber.

[0010] Through the above technical scheme, isoprene rubber is a cis-structure rubber formed by the polymerization of isoprene monomers. Its elasticity and strength are slightly lower than those of natural rubber, but it has good wear resistance and drought resistance and good processability. When used here, it can drive the blade body to shake while firmly clamping the blade body, thereby achieving the purpose of fatigue testing it.

[0011] Furthermore, the clamping mechanism includes a rotating rod, a bottom bevel gear, a side bevel gear, a forward and reverse screw rod and two driving rods, a moving cavity is opened in the moving box, the two driving rods are respectively fixedly connected to the bottom of the two clamp arms, the top wall of the moving box is opened with two moving grooves, the two moving grooves are located on the same straight line, the two moving grooves are connected to the moving cavity, the two driving rods are respectively slidably connected to the inner walls of the two moving grooves, a threaded groove is opened on the bottom side wall of the driving rod, the two ends of the forward and reverse screw rods are respectively rotatably connected to the side walls on both sides of the moving cavity, the two threaded grooves are respectively threadedly connected to the two opposite threaded sections of the forward and reverse screw rods, the side bevel gear is fixedly arranged in the middle part of the forward and reverse screw rods, a rotating hole is opened in the bottom wall of the moving cavity, the rotating rod is rotatably connected to the inner wall of the rotating hole, one end of the rotating rod is fixedly connected to the bottom wall of the bottom bevel gear, and the bottom bevel gear is meshed with the side bevel gear.

[0012] Through the above technical solution, the rotation of the rotating rod will drive the bottom bevel gear to rotate, and then the side bevel gear will drive the forward and reverse screws to rotate, so that the two clamping arms can clamp the end of the blade body away from the gravity mass block, which is convenient for the subsequent shaking of the blade body, thereby simulating the possible impact during the operation process.

[0013] Furthermore, the rotating rod and the movement hole are both located in the middle of the movement box, a bearing is provided in the rotating hole, and the rotating rod is fixedly connected to the inner wall of the bearing.

[0014] Through the above technical solution, the setting of the bearing can make the rotating rod rotate stably, thereby ensuring that the rotating rod can stably drive the bottom bevel gear to rotate. At the same time, the bearing can also prevent the rotating rod from unexpected axial movement.

[0015] Furthermore, a padding block is fixedly connected to the inner wall of the rotating box, a bottom wall of the padding block is fixedly connected to a bottom gear disk, a fixing ring is fixedly connected to the bottom wall of the fixed box, a plurality of rotating grooves are opened on the top wall of the fixing ring, a bottom bevel gear is rotatably connected to each rotating groove, and each bottom bevel gear is meshed with the bottom gear disk.

[0016] Through the above technical solution, the rotation of the bottom bevel gear will drive the bottom gear plate to rotate. Due to the setting of the pad block, the rotation of the bottom gear plate will also drive the rotating box to rotate. The several bottom bevel gears arranged in the fixed ring can not only support the bottom gear plate, but also drive the bottom gear plate and the rotating box to rotate.

[0017] Furthermore, one of the bottom bevel gears is fixedly connected to an extension rod at one end facing the middle position of the fixing ring, the bottom wall of the fixing box is fixedly connected to a vertical plate, the extension rod passes through the vertical plate, and the extension rod is fixedly connected to a toggle gear at one end away from the bottom bevel gear.

[0018] Through the above technical solution, when the toggle gear is driven to rotate, the extension rod will drive the rotating bevel gear to rotate together, and then the bottom gear plate and the rotating box will rotate at the same time, and finally the clamping arm will drive the blade body to shake, simulating the influence of centrifugal force on the blade body during operation.

[0019] Furthermore, the reciprocating rotating mechanism includes a servo motor, a driving shaft, a rotating toothed disk, a rotating bevel gear, a connecting rod, a first back gear, a second back gear and a plurality of shifting rods, the servo motor is fixedly arranged on the bottom wall of the fixed box, the output end of the servo motor is fixedly connected to the driving shaft, the other end of the driving shaft is connected to the rotating rod, the rotating toothed disk is arranged above the driving shaft, the first back gear and the second back gear are both rotatably connected to the side wall of the vertical plate, the first back gear is meshed with the second back gear, the connecting rod is fixedly connected to the side wall of the first back gear, the rotating bevel gear is fixedly connected to the end of the connecting rod away from the first back gear, the tooth shape of the rotating bevel gear matches the tooth shape of the rotating toothed disk, the rotating bevel gear is located below the rotating toothed disk, the plurality of shifting rods are divided into two groups, which are respectively fixed on the side wall of the first back gear and the side wall of the second back gear, and the distance between the plurality of shifting rods is consistent with the tooth pitch of the shifting gear.

[0020] Through the above technical solution, the rotation of the servo motor will cause the active rotating shaft to rotate, and the rotating rod arranged on the top of the active rotating shaft can drive the rotating rod to rotate, thereby driving the two clamping arms. At the same time, the rotation of the active rotating shaft can also drive the rotating gear plate to rotate, thereby causing the rotating bevel gear meshing with the rotating gear plate to rotate. Under the connection effect of the connecting rod, the first back gear and the second back gear will be driven to rotate. Due to the presence of several shifting rods, the shifting gear will rotate back and forth, thereby driving the rotating box and the clamping arm to swing back and forth, thereby performing fatigue testing on the blade body.

[0021] Furthermore, the active rotating shaft is fixedly connected to a telescopic shaft at one end away from the servo motor, the rotating gear disc is fixedly connected to the side wall of the telescopic shaft, the other end of the telescopic shaft is fixedly connected to a clamping block, the rotating rod is provided with a clamping groove on the side wall facing one end of the active rotating shaft, the clamping block is clamped in the clamping groove, a horizontal plate is installed on the side wall of the telescopic shaft, the rotating gear disc is located below the horizontal plate, two electric push rods are installed on the top of the bottom gear disc, and the output ends of the two electric push rods are respectively fixedly connected to the bottom walls at both ends of the horizontal plate.

[0022] Through the above technical solution, the extension and retraction of the electric push rod can be driven to lengthen or shorten the telescopic shaft, thereby causing the clamping block to enter or leave the clamping slot, so that after the clamping arm reaches the specified position, the drive of the active rotating shaft is lost, so that the clamping arm can be fixed in the current position, thereby facilitating a stable clamping effect on the blade body.

[0023] Furthermore, an annular groove is formed on the side wall of the telescopic shaft, a rotating ring is rotatably connected in the annular groove, and the transverse plate is fixedly connected to the side wall of the rotating plate.

[0024] Through the above technical solution, the rotating ring arranged in the annular groove can ensure that the horizontal plate will not affect the normal operation of the active rotating shaft during the rotation of the active rotating shaft. At the same time, the setting of the annular groove can also make the lifting and lowering of the horizontal plate drive the telescopic rod and the block to lift and lower together, thereby causing the rotating rod to lose or gain driving force.

[0025] Furthermore, the height of the raising block is greater than the height of the electric push rod, the raising block is in a circular shape, the two electric push rods are located on the same straight line, the fixing ring is located in the middle of the cross plate, and the length of the cross plate is less than the diameter of the raising block.

[0026] Through the above technical solution, the bottom gear plate and the rotating box are connected together through the spacer block. In order to ensure the safety of the electric push rod without colliding with the rotating box during the extension and shortening, it is necessary to correctly set the height of the spacer block. At the same time, the fixing ring is set in the middle position of the cross plate, so that the center of gravity of the cross plate can fall on the active rotating shaft.

[0027] The beneficial effects of the present invention are as follows:

[0028] (1) The present invention arranges a mobile test vehicle below the tail end of the blade body, so that the clamp arm on the top of the test vehicle at one end can stably clamp the blade body. The reciprocating rotating mechanism between the fixed box and the rotating box of the mobile test vehicle can simulate the influence of centrifugal force on the blade body during the test, thereby more accurately simulating the fatigue influence of the wind turbine blade during the rotation process, so that the test result is more comprehensive;

[0029] (2) The present invention arranges a servo motor in a fixed box. When driving the active rotating shaft to rotate, the servo motor can drive the rotating rod, thereby causing the two clamping arms to move along the moving groove to clamp the blade body. It can also drive the reciprocating rotating mechanism to cause the rotating box to reciprocate, thereby simulating fatigue testing on the blade body, thereby facilitating obtaining the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a structural diagram of the clamping mechanism in the present invention;

[0032] Figure 3 It is a schematic diagram of the structure inside the rotating box and the fixed box in the present invention;

[0033] Figure 4 It is a structural schematic diagram of the reciprocating rotating mechanism in the present invention;

[0034] Figure 5 It is a structural schematic diagram of the bottom gear disc and the bottom bevel gear in the present invention;

[0035] Figure 6 It is a schematic diagram of the connection structure between the telescopic shaft and the rotating rod in the present invention;

[0036] Figure 7 It is a connection diagram of the first back gear, the second back gear and the shifting gear in the present invention.

[0037] Reference numerals: 1, gravity mass block; 2, blade body; 3, travel wheel; 4, clamping arm; 5, moving box; 6, rotating box; 7, fixed box; 8, buffer block; 9, rotating rod; 10, bottom bevel gear; 11, side bevel gear; 12, positive and negative threaded rod; 13, driving rod; 14, moving groove; 15, threaded groove; 16, rotating hole; 17, bearing; 18, spacer block; 19, bottom toothed disc; 20, fixing ring; 21 , rotating groove; 22, bottom bevel gear; 23, extension rod; 24, vertical plate; 25, toggle gear; 26, servo motor; 27, active shaft; 28, rotating gear plate; 29, rotating bevel gear; 30, connecting rod; 31, first back gear; 32, second back gear; 33, toggle lever; 34, telescopic shaft; 35, block; 36, slot; 37, horizontal plate; 38, electric push rod; 39, annular groove; 40, rotating ring. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] like Figure 1 - Figure 7 As shown, a wind turbine blade fatigue testing device of the present embodiment includes a gravity mass block 1 and a blade body 2. The blade body 2 is fixedly arranged on the side wall of the gravity mass block 1. After the blade body 2 is fixed on the gravity mass block 1, fatigue testing of the blade body 2 is a common means in the fatigue testing process, and the fixing means has nothing to do with the innovative part of the present application, so the specific principle is not repeated. A mobile test vehicle for testing the fatigue of the blade body 2 is arranged at the bottom of one end of the blade body 2 away from the gravity mass block 1, and a plurality of driving wheels 3 are installed at the bottom of the mobile test vehicle. The arrangement of the driving wheels 3 can enhance the mobility of the mobile test vehicle, thereby facilitating the adjustment of the position of the mobile test vehicle and facilitating fatigue testing of different positions of the blade body 2.

[0040] Reference Figure 1 and Figure 2 Two clamping arms 4 are installed on the top of the mobile test vehicle, and both clamping arms 4 are "C"-shaped. The side walls of the blade body 2 on both sides of the end away from the gravity mass block 1 are clamped by the two clamping arms 4. A buffer block 8 is fixedly provided on the inner wall of the clamping arm 4. The side wall of the buffer block 8 is against the side wall of the blade body 2. The material of the buffer block 8 is isoprene rubber. Isoprene rubber is a cis-structure rubber formed by the polymerization of isoprene monomers. Its elasticity and strength are slightly lower than those of natural rubber, but it has good wear resistance and drought resistance, and good processability. It can be used here to drive the blade body 2 to shake while firmly clamping the blade body 2, thereby achieving the purpose of fatigue testing it.

[0041] Reference Figure 2 The mobile test vehicle is divided into three layers. The top layer is a motion box 5, and the two clamping arms 4 are located on this layer. A clamping mechanism for controlling the movement of the clamping arms 4 is provided in the motion box 5. The clamping mechanism includes a rotating rod 9, a bottom bevel gear 10, a side bevel gear 11, a positive and negative threaded rod 12 and two driving rods 13. A motion cavity is provided in the motion box 5. The two driving rods 13 are respectively fixedly connected to the bottom of the two clamping arms 4. Two motion grooves 14 are provided on the top wall of the motion box 5. The two motion grooves 14 are located on the same straight line. The two motion grooves 14 are connected to the motion cavity. The two driving rods 13 are respectively connected to the inner walls of the two motion grooves 14 for sliding. Then, a thread groove 15 is provided on the bottom side wall of the driving rod 13, and the two ends of the forward and reverse screw rods 12 are rotatably connected to the side walls of the motion chamber respectively. The two thread grooves 15 are threadedly connected to the two opposite thread sections of the forward and reverse screw rods 12 respectively. The side bevel gear 11 is fixedly arranged in the middle part of the forward and reverse screw rods 12. The rotation of the rotating rod 9 will drive the bottom bevel gear 10 to rotate, and then the side bevel gear 11 will drive the forward and reverse screw rods 12 to rotate, so that the two clamping arms 4 can clamp the blade body 2 away from one end of the gravity mass block 1, which is convenient for the subsequent shaking of the blade body 2, thereby simulating the possible impact during the operation.

[0042] A rotating hole 16 is provided on the bottom wall of the motion cavity, and the rotating rod 9 is rotatably connected to the inner wall of the rotating hole 16. One end of the rotating rod 9 is fixedly connected to the bottom wall of the bottom bevel gear 10, and the bottom bevel gear 10 is meshed with the side bevel gear 11. The rotating rod 9 and the motion hole are both located in the middle position of the motion box 5. The side bevel gear 11 is not located in the middle position of the positive and negative threaded rods 12, but is located to the left or right of the middle. A bearing 17 is provided in the rotating hole 16, and the rotating rod 9 is fixedly connected to the inner wall of the bearing 17. The setting of the bearing 17 can make the rotating rod 9 rotate stably, thereby ensuring that the rotating rod 9 can stably drive the bottom bevel gear 10 to rotate. At the same time, the bearing 17 can also prevent the rotating rod 9 from unexpected axial movement.

[0043] Reference Figure 3 and Figure 4The inner wall of the rotating box 6 is fixedly connected with a pad block 18, and the height of the pad block 18 is greater than the height of the electric push rod 38. The pad block 18 is annular, and the bottom gear disc 19 and the rotating box 6 are connected together through the pad block 18. In order to ensure the safety of the elongation and shortening of the electric push rod 38 will not collide with the rotating box 6, it is necessary to correctly set the height of the pad block 18, and the bottom wall of the pad block 18 is fixedly connected with the bottom gear disc 19, and the bottom wall of the fixed box 7 is fixedly connected with a fixing ring 20. The top wall of the fixing ring 20 is provided with a plurality of rotating grooves 21, and each rotating groove 21 is rotatably connected with a bottom bevel gear 22, and each bottom bevel gear 22 is meshed with the bottom gear disc 19. The rotation of the bottom bevel gear 22 will drive the bottom gear disc 19 to rotate. Due to the setting of the pad block 18, the rotation of the bottom gear disc 19 will also drive the rotating box 6 to rotate, and the plurality of bottom bevel gears 22 arranged in the fixing ring 20 can both support the bottom gear disc 19 and drive the bottom gear disc 19 and the rotating box 6 to rotate.

[0044] Reference Figure 4 and Figure 7 One end of one of the bottom bevel gears 22 facing the middle position of the fixed ring 20 is fixedly connected to an extension rod 23, and the bottom wall of the fixed box 7 is fixedly connected to a vertical plate 24. The extension rod 23 passes through the vertical plate 24, and the extension rod 23 does not contact the vertical plate 24, so the vertical plate 24 will not affect the rotation of the extension rod 23. The end of the extension rod 23 away from the bottom bevel gear 22 is fixedly connected to a toggle gear 25.

[0045] Reference Figure 2 , Figure 4 and Figure 7, located in the middle layer is a rotating box 6, which is fixedly connected to the bottom wall of the moving box 5, and at the bottom is a fixed box 7, the bottom wall of the rotating box 6 is rotatably connected to the top of the fixed box 7, the interior of the rotating box 6 is connected to the interior of the fixed box 7, and a reciprocating rotating mechanism that drives the rotating box 6 to rotate is arranged in the internal communicating space between the rotating box 6 and the fixed box 7, the reciprocating rotating mechanism includes a servo motor 26, a driving shaft 27, a rotating toothed disc 28, a rotating bevel gear 29, a connecting rod 30, a first back gear 31, a second back gear 32 and a plurality of levers 33, the servo motor 26 is fixedly arranged on the bottom wall of the fixed box 7, the output end of the servo motor 26 is fixedly connected to the driving shaft 27, the other end of the driving shaft 27 is connected to the rotating rod 9, the rotating toothed disc 28 is arranged above the driving shaft 27, the first back gear 31 and the second back gear 32 are both rotatably connected to the side wall of the vertical plate 24, and the first back gear 31 meshes with the second back gear 32 The connecting rod 30 is fixedly connected to the side wall of the first back gear 31, and the rotating bevel gear 29 is fixedly connected to the end of the connecting rod 30 away from the first back gear 31. The tooth shape of the rotating bevel gear 29 matches the tooth shape of the rotating toothed disk 28. The rotating bevel gear 29 is located below the rotating toothed disk 28. The rotation of the servo motor 26 will cause the active rotating shaft 27 to rotate, and the rotating rod 9 arranged on the top of the active rotating shaft 27 can drive the rotating rod 9 to rotate, thereby driving the two clamping arms 4. At the same time, the rotation of the active rotating shaft 27 can also drive the rotating toothed disk 28 to rotate, thereby causing the rotating bevel gear 29 meshing with the rotating toothed disk 28 to rotate. Under the connection effect of the connecting rod 30, the first back gear 31 and the second back gear 32 will be driven to rotate. Due to the presence of a number of shifting rods 33, the shifting gear 25 will be caused to rotate back and forth, thereby driving the rotating box 6 and the clamping arm 4 to shake back and forth, and fatigue testing will be performed on the blade body 2.

[0046] Reference Figure 7 The plurality of levers 33 are divided into two groups, which are respectively fixed on the side wall of the first back gear 31 and the side wall of the second back gear 32. The number of levers 33 arranged on the side wall of the first back gear 31 and the side wall of the second back gear 32 is the same, and the two groups of levers 33 are arranged in different directions. The distance between the plurality of levers 33 is consistent with the tooth pitch of the toggle gear 25, and only one group of levers 33 will be engaged with the toggle gear 25 at the same time.

[0047] Reference Figure 5 and Figure 6The active shaft 27 is fixedly connected to one end away from the servo motor 26 with a telescopic shaft 34. The telescopic shaft 34 provided here is a telescopic component that can transmit the rotation effect, that is, the rotation of the active shaft 27 can drive the telescopic shaft 34 to rotate synchronously. This is a very common setting, so the specific model is not particularly described here. The rotating gear plate 28 is fixedly connected to the side wall of the telescopic shaft 34, and the other end of the telescopic shaft 34 is fixedly connected to a clamping block 35. The rotating rod 9 is provided with a clamping groove 36 on the side wall of one end facing the active shaft 27, and the clamping block 35 is clamped in the clamping groove 36. In the figure, a horizontal plate 37 is installed on the side wall of the telescopic shaft 34, and an annular groove 39 is opened on the side wall of the telescopic shaft 34. A rotating ring 40 is rotatably connected in the annular groove 39. The horizontal plate 37 is fixedly connected to the side wall of the rotating plate. The rotating ring 40 arranged in the annular groove 39 can ensure that during the rotation of the active rotating shaft 27, the horizontal plate 37 will not affect the normal operation of the active rotating shaft 27. At the same time, the setting of the annular groove 39 can also make the lifting and lowering of the horizontal plate 37 drive the telescopic rod and the block 35 to lift and lower together, thereby causing the rotating rod 9 to lose or gain driving force.

[0048] The rotating gear disc 28 is located below the transverse plate 37. Two electric push rods 38 are installed on the top of the bottom gear disc 19. The output ends of the two electric push rods 38 are fixedly connected to the bottom walls of the two ends of the transverse plate 37 respectively. The two electric push rods 38 are located on the same straight line. The fixing ring 20 is located in the middle position of the transverse plate 37. The length of the transverse plate 37 is less than the diameter of the pad block 18. The fixing ring 20 is set in the middle position of the transverse plate 37, which can make the center of gravity of the transverse plate 37 fall on the active rotating shaft 27, so that the transverse plate 37 can stably drive the telescopic shaft 34 to rise and fall together.

[0049] The working principle of this embodiment is as follows: first, the blade body 2 is fixed to the gravity mass block 1, and then the mobile test vehicle is moved to the end of the blade body 2 away from the gravity mass block 1, at which time the two clamping arms 4 are in a state of being away from each other;

[0050] At this time, the two electric push rods 38 are in an extended state, that is, the block 35 is in the slot 36 at the bottom of the rotating rod 9, and the rotating toothed disc 28 is above the rotating bevel gear 29, and the two are not in contact. The servo motor 26 is started, so that the active shaft 27 rotates together with the output end of the servo motor 26, and the telescopic shaft 34 fixed on the top of the active shaft 27 will rotate along with it, thereby driving the block 35 to rotate. Due to the limiting effect of the block 35 and the slot 36, the rotating rod 9 will rotate synchronously, and the rotation of the rotating rod 9 will drive the bottom bevel gear 10 to rotate, and the side bevel gear 11 meshing therewith will rotate together, and the positive and negative threaded rods 12 fixedly connected to the side bevel gear 11 will rotate synchronously. Due to the limitation of the thread groove 15, the two driving rods 13 will drive the clamping arm 4 to move along the motion groove 14 together, thereby clamping the blade body 2;

[0051] After the blade body 2 is clamped, the electric push rod 38 is driven to shorten, and the horizontal plate 37 fixedly connected to the output end of the electric push rod 38 will drive the rotating ring 40 to descend together, thereby compressing the telescopic shaft 34, and the clamping block 35 will leave the clamping groove 36. At this time, the rotation of the active rotating shaft 27 will not affect the rotation of the rotating rod 9. At the same time, due to the descent of the telescopic shaft 34, the rotating toothed disc 28 and the rotating bevel gear 29 will reach a meshing condition;

[0052] At this time, the servo motor 26 is started again, and the rotation of the active rotating shaft 27 will cause the telescopic shaft 34 to rotate synchronously with the rotating gear plate 28, and the rotating bevel gear 29 meshing with the rotating gear plate 28 will drive the connecting rod 30 to rotate together, and the first back gear 31 fixedly connected to the other end of the connecting rod 30 will drive the second back gear 32 to rotate together, and the lever 33 arranged on the side wall of the first back gear 31 and the side wall of the second back gear 32 will cause the toggle gear 25 to rotate reciprocatingly, thereby causing the extension rod 23 on the side wall of the toggle gear 25 to drive the bottom bevel gear 22 to rotate together, because the bottom bevel gear 22 is meshed with the bottom gear plate 19, the bottom gear plate 19 will drive the padding block 18 and the rotating box 6 to rotate reciprocatingly together, and the moving box 5 and the clamping arm 4 arranged on the top of the rotating box 6 will drive the blade body 2 to rotate reciprocatingly together, thereby performing a fatigue test on the blade body 2.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A wind turbine blade fatigue testing device, comprising a gravity mass block (1) and a blade body (2), wherein the blade body (2) is fixedly arranged on a side wall of the gravity mass block (1), characterized in that: A mobile test vehicle for testing fatigue of the blade body (2) is arranged at the bottom of one end of the blade body (2) away from the gravity mass block (1), a plurality of running wheels (3) are arranged at the bottom of the mobile test vehicle, and two clamping arms (4) are arranged at the top of the mobile test vehicle, both of the two clamping arms (4) are in a "C" shape, and the side walls of both sides of the end of the blade body (2) away from the gravity mass block (1) are clamped by the two clamping arms (4); The mobile test vehicle is divided into three layers. The top layer is a moving box (5) on which the two clamping arms (4) are located. The moving box (5) is provided with a clamping mechanism for controlling the movement of the clamping arms (4). The middle layer is a rotating box (6) which is fixedly connected to the bottom wall of the moving box (5). The bottom layer is a fixed box (7) which is rotatably connected to the top of the fixed box (7). The interior of the rotating box (6) is connected to the interior of the fixed box (7). A reciprocating rotating mechanism for driving the rotating box (6) to rotate is arranged in the connecting space between the rotating box (6) and the fixed box (7).

2. The wind turbine blade fatigue testing device according to claim 1, characterized in that: A buffer block (8) is fixedly arranged on the inner wall of the clamp arm (4), the side wall of the buffer block (8) abuts against the side wall of the blade body (2), and the material of the buffer block (8) is isoprene rubber.

3. The wind turbine blade fatigue testing device according to claim 1, characterized in that: The clamping mechanism comprises a rotating rod (9), a bottom bevel gear (10), a side bevel gear (11), a forward and reverse threaded rod (12) and two driving rods (13); a moving cavity is provided in the moving box (5); the two driving rods (13) are respectively fixedly connected to the bottoms of the two clamping arms (4); the top wall of the moving box (5) is provided with two moving grooves (14); the two moving grooves (14) are located on the same straight line; the two moving grooves (14) are both connected to the moving cavity; the two driving rods (13) are respectively slidably connected to the inner walls of the two moving grooves (14); the driving rods (13) A thread groove (15) is provided on the bottom side wall, and the two ends of the positive and negative threaded rod (12) are respectively rotatably connected to the side walls of the movement chamber, and the two thread grooves (15) are respectively threadedly connected to the two opposite thread segments of the positive and negative threaded rod (12). The side bevel gear (11) is fixedly arranged in the middle part of the positive and negative threaded rod (12). A rotating hole (16) is provided on the bottom wall of the movement chamber, and the rotating rod (9) is rotatably connected to the inner wall of the rotating hole (16). One end of the rotating rod (9) is fixedly connected to the bottom wall of the bottom bevel gear (10), and the bottom bevel gear (10) is meshed with the side bevel gear (11).

4. The wind turbine blade fatigue testing device according to claim 3, characterized in that: The rotating rod (9) and the movement hole are both located in the middle of the movement box (5); a bearing (17) is arranged in the rotating hole (16); and the rotating rod (9) is fixedly connected to the inner wall of the bearing (17).

5. The wind turbine blade fatigue testing device according to claim 3, characterized in that: The inner wall of the rotating box (6) is fixedly connected with a padding block (18), the bottom wall of the padding block (18) is fixedly connected with a bottom toothed disc (19), the bottom wall of the fixed box (7) is fixedly connected with a fixing ring (20), the top wall of the fixing ring (20) is provided with a plurality of rotating grooves (21), each of the rotating grooves (21) is rotatably connected with a bottom bevel gear (22), and each of the bottom bevel gears (22) is meshed with the bottom toothed disc (19).

6. The wind turbine blade fatigue testing device according to claim 5, characterized in that: One end of the bottom bevel gear (22) facing the middle position of the fixing ring (20) is fixedly connected to an extension rod (23), the bottom wall of the fixing box (7) is fixedly connected to a vertical plate (24), the extension rod (23) passes through the vertical plate (24), and the end of the extension rod (23) away from the bottom bevel gear (22) is fixedly connected to a toggle gear (25).

7. The wind turbine blade fatigue testing device according to claim 6, characterized in that: The reciprocating rotating mechanism comprises a servo motor (26), a driving rotating shaft (27), a rotating toothed disc (28), a rotating bevel gear (29), a connecting rod (30), a first back gear (31), a second back gear (32) and a plurality of shifting rods (33). The servo motor (26) is fixedly arranged on the bottom wall of the fixed box (7). The output end of the servo motor (26) is fixedly connected to the driving rotating shaft (27). The other end of the driving rotating shaft (27) is connected to the rotating rod (9). The rotating toothed disc (28) is arranged above the driving rotating shaft (27). The first back gear (31) and the second back gear (32) are both rotatably connected to the side wall of the vertical plate (24). The first back gear (31) is meshed with the second back gear (32), the connecting rod (30) is fixedly connected to the side wall of the first back gear (31), the rotating bevel gear (29) is fixedly connected to one end of the connecting rod (30) away from the first back gear (31), the tooth shape of the rotating bevel gear (29) matches the tooth shape of the rotating toothed disc (28), the rotating bevel gear (29) is located below the rotating toothed disc (28), the plurality of shifting rods (33) are divided into two groups, and are respectively fixed on the side wall of the first back gear (31) and the side wall of the second back gear (32), and the distance between the plurality of shifting rods (33) is consistent with the tooth pitch of the shifting gear (25).

8. The wind turbine blade fatigue testing device according to claim 7, characterized in that: The active rotating shaft (27) is fixedly connected to one end thereof away from the servo motor (26) with a telescopic shaft (34); the rotating toothed disc (28) is fixedly connected to the side wall of the telescopic shaft (34); the other end of the telescopic shaft (34) is fixedly connected to a clamping block (35); a clamping groove (36) is provided on the side wall of one end of the rotating rod (9) facing the active rotating shaft (27); the clamping block (35) is clamped in the clamping groove (36); a transverse plate (37) is arranged on the side wall of the telescopic shaft (34); the rotating toothed disc (28) is located below the transverse plate (37); two electric push rods (38) are arranged on the top of the bottom toothed disc (19); the output ends of the two electric push rods (38) are respectively fixedly connected to the bottom walls at both ends of the transverse plate (37).

9. The wind turbine blade fatigue testing device according to claim 8, characterized in that: The side wall of the telescopic shaft (34) is provided with an annular groove (39), a rotating ring (40) is rotatably connected in the annular groove (39), and the transverse plate (37) is fixedly connected to the side wall of the rotating plate.

10. The wind turbine blade fatigue testing device according to claim 8, characterized in that: The height of the padding block (18) is greater than the height of the electric push rod (38), the padding block (18) is in the shape of a circular ring, the two electric push rods (38) are located on the same straight line, the fixing ring (20) is located in the middle position of the cross plate (37), and the length of the cross plate (37) is less than the diameter of the padding block (18).

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