CN117405532A

CN117405532A - Multifunctional fatigue testing device for blade

Info

Publication number: CN117405532A
Application number: CN202311700138.8A
Authority: CN
Inventors: 李德旺; 白学宗; 马强; 安宗文; 罗明伟; 杨挺; 马辉东; 连喆; 赵光煜; 赵婧
Original assignee: Lanzhou University of Technology
Current assignee: Lanzhou University of Technology
Priority date: 2023-12-12
Filing date: 2023-12-12
Publication date: 2024-01-16
Anticipated expiration: 2043-12-12
Also published as: CN117405532B

Abstract

The invention discloses a multifunctional fatigue testing device for a blade. The device comprises a platform, blades, a counterweight, a speed reducer, a follow-up connecting rod, a first blade clamp, a driving connecting rod, a control cabinet, a rocker, a crank, a motor and a clutch. The device can respectively complete bending fatigue tests of the blade in the two directions of waving and shimmy, can simultaneously complete the waving and shimmy bidirectional fatigue test, adjusts the connection form of the follow-up connecting rod and the driving connecting rod, and can also realize fatigue tests of three combined forms of waving bending + torsion "," shimmy bending + torsion "," waving bending + shimmy bending + torsion ". Compared with the prior art, the multifunctional fatigue testing device for the blades has the advantages of short testing time, easiness in damage decoupling, lower electric energy consumption, more functions and capability of meeting the fatigue testing requirements of blades with larger specifications.

Description

Multifunctional fatigue testing device for blade

Technical Field

The invention relates to the field of wind turbine generator testing, in particular to a multifunctional fatigue testing device for blades.

Background

Fatigue testing is an important way to verify the quality of a blade as specified by national standards. The fatigue test of the blade mostly adopts a unidirectional loading mode, namely bending fatigue loading is respectively carried out in the blade waving and shimmy directions, and the mode has long test period and high test cost. There are studies on two-way loading, i.e. loading in the blade flapping and shimmy directions simultaneously, for example, patent "CN202110849560.4" proposes a resonant biaxial fatigue loading method for wind turbine blades, and patent "CN201811336030.4" proposes that hydraulic pressure is used as power to provide exciting force for the blade flapping and shimmy directions. Although the method can effectively compress the test time and cost, the excitation device is difficult to provide enough excitation force along with the gradual increase of the blade size, multi-point loading is needed, and the difficulties of synchronous control, bending moment matching and damage decoupling of the motor are increased. In addition, in the existing method, the first blade clamp is installed on the blade, so that the weight of the blade is greatly increased, the natural frequency of the blade is reduced, and the testing time is prolonged. The patent CN202310388320.8 provides exciting force for the blade through a five-rod mechanism, excessive mass is not added on the blade, multi-point loading is avoided to a certain extent, but the exciting action of the balancing weight is ignored, only the linear motion in the waving direction and the simple bidirectional motion can be completed, the linear motion in the shimmy direction is difficult to complete, and the practical aspect has certain limitation.

As the size of the blade continuously rises and the torsion resistance of the blade continuously decreases, the low-order bending mode and the torsion mode are mutually coupled in the operation process to influence the service life of the blade, so that the torsion fatigue performance of the blade must be checked, and the patent CN202221746732.1 proposes a blade torsion fatigue testing device to meet the torsion fatigue testing requirement. However, the additional development of the torsional fatigue test further increases the test time and cost, and an effective solution is to perform the bending fatigue test and the torsional fatigue test synchronously, but no feasible technical solution is available at present.

To sum up, there are two technical problems to be solved in the current blade fatigue test: firstly, synchronously finishing a blade waving, shimmy bending fatigue test and a torsional fatigue test; and secondly, how to avoid multi-point loading, reduce additional mass and provide larger exciting force.

Disclosure of Invention

Aiming at the technical problems in the background technology, the invention aims to provide the multifunctional fatigue testing device for the blade, which can realize bending loading and torsion loading in the flapping and shimmy directions simultaneously, is only loaded at one point, has small additional mass, has short testing period and is easy to decouple.

In order to achieve the purpose, the multifunctional fatigue testing device for the blade comprises a frame, wherein the root of the blade is fixed on the frame, and the blade is connected with an excitation driving module and a counterweight device;

the excitation driving module comprises a first blade clamp, a driving connecting rod and a driving motor, wherein the first blade clamp is arranged at the middle section of the blade, and the bottom of the first blade clamp is connected with the driving connecting rod; the driving connecting rod is connected with a driving motor;

the driving connecting rod comprises an active driving module and a follow-up driving module; the driving motor comprises an active driving motor group and a follow-up driving motor group;

the active driving module comprises an active connecting rod, an active rocker and an active crank set, wherein the active connecting rod is connected with the active rocker, and the active rocker is connected with the active crank set;

the driving connecting rod is a hollow square pipe, one end of the driving connecting rod is provided with a telescopic threaded pipe, and the other end of the driving connecting rod is provided with a driving connecting rod;

the sliding assembly comprises an active rocker screw rod and an active rocker sliding nut matched with the active rocker screw rod, wherein the active rocker sliding nut is connected with an active connecting rod, one end of the active rocker is provided with an active rocker end arm, and the other end of the active rocker is provided with an active rocker end cover;

The driving crank group consists of two driving crank rods which are arranged correspondingly, namely a first driving crank rod and a second driving crank rod;

the active driving motor unit consists of two active driving motors which are arranged correspondingly, namely a first active driving motor and a second active driving motor;

one end of the first driving crank rod is connected with the driving crank rod end arm, and the other end of the first driving crank rod is connected with the first driving motor; one end of the second driving crank rod is connected with the driving crank rod end arm, and the other end of the second driving crank rod is connected with a second driving motor;

the follow-up driving module comprises a follow-up connecting rod, a follow-up rocker and a follow-up crank set; the follow-up connecting rod is connected with a follow-up rocker which is connected with a follow-up crank set;

the follow-up connecting rod is a hollow square tube, one end of the follow-up connecting rod is provided with a first follow-up connecting rod, and the other end of the follow-up connecting rod is provided with a second follow-up connecting rod;

the sliding assembly comprises a follow-up rocker screw rod and a follow-up rocker sliding nut matched with the follow-up rocker screw rod, wherein the follow-up rocker sliding nut is connected with the first follow-up connecting rod, one end of the follow-up rocker is provided with a follow-up rocker end arm, and the other end of the follow-up rocker is provided with a follow-up rocker end cover;

The follow-up crank group consists of two follow-up crank rods which are arranged correspondingly, namely a first follow-up crank rod and a second follow-up crank rod;

the follow-up driving motor unit consists of two follow-up driving motors which are arranged correspondingly, namely a first follow-up driving motor and a second follow-up driving motor;

one end of the first follow-up crank rod is connected with a follow-up crank rod end arm, and the other end of the first follow-up crank rod is connected with a first follow-up driving motor; one end of the second follow-up crank rod is connected with the follow-up crank rod end arm, and the other end of the second follow-up crank rod is connected with the second follow-up driving motor.

The telescopic threaded pipe is connected with one end of the driving connecting rod through a guide sleeve, one end of the telescopic threaded pipe is connected with the first blade clamp, and the other end of the telescopic threaded pipe is connected with the servo motor through a telescopic threaded rod; the inside of initiative connecting rod is fixed to be provided with the rectangular plate, servo motor fixed mounting on the rectangular plate, servo motor's output runs through the rectangular plate and is connected with telescopic threaded rod's input.

The driving rocker is of a C-shaped channel steel structure, driving rocker sliding nuts are arranged in a sliding matching mode in the C-shaped channel steel structure, driving rocker lead screws penetrate through the driving rocker end covers and are arranged on the driving rocker end covers, the driving rocker lead screws penetrate through the sliding nuts, and the sliding nuts can slide in the C-shaped channel steel structure through the driving rocker lead screws.

The first driving crank rod is fixedly connected with the second driving crank rod through a first connecting block, the first driving crank rod is fixed with the first connecting block through a plurality of first connecting screws, and the second driving crank rod is fixed with the first connecting block through a plurality of second connecting screws;

the first driving crank rod is hinged with the driving rocker end arm;

a first clutch is arranged between the first driving crank rod and the first driving motor, and a first speed reducer is arranged between the first clutch and the first driving motor;

the first driving crank rod is connected with the first clutch through a first clutch main shaft, and the first speed reducer is connected with the first driving motor through a first coupling;

the first clutch main shaft is connected with the first driving crank rod through a first flange, and the first flange is fixed with the first driving crank rod through a first flange bolt assembly;

the second driving crank rod is hinged with the driving rocker end arm;

a second clutch is arranged between the second driving crank rod and the second driving motor, and a second speed reducer is arranged between the second clutch and the second driving motor;

the second driving crank rod is connected with the second clutch through a second clutch main shaft, and the second speed reducer is connected with the second driving motor through a second coupling;

The second clutch main shaft is connected with a second driving crank rod through a second flange, and the second flange is fixed with the second driving crank rod through a second flange bolt assembly.

The follow-up rocker is of a C-shaped channel steel structure, follow-up rocker sliding nuts are arranged in a sliding matching mode in the C-shaped channel steel structure, follow-up rocker lead screws penetrate through the follow-up rocker end covers and are arranged on the follow-up rocker end covers, the follow-up rocker lead screws penetrate through the follow-up rocker sliding nuts, and the follow-up rocker sliding nuts can slide in the C-shaped channel steel structure through the follow-up rocker lead screws.

The first follow-up crank rod is fixedly connected with the second follow-up crank rod through a second connecting block, the first follow-up crank rod is fixed with the second connecting block through a plurality of fourth connecting screws, and the second follow-up crank rod is fixed with the second connecting block through a plurality of third connecting screws;

the first follow-up crank rod is hinged with the follow-up crank rod arm;

a fourth clutch is arranged between the first follow-up crank rod and the first follow-up driving motor, and a fourth speed reducer is arranged between the fourth clutch and the first follow-up driving motor;

the first follow-up crank rod is connected with a fourth clutch through a fourth clutch main shaft, and the fourth speed reducer is connected with the first follow-up driving motor through a fourth coupling;

The fourth clutch main shaft is connected with the first follow-up crank rod through a fourth flange, and the fourth flange is fixed with the first follow-up crank rod through a fourth flange bolt assembly;

the second follow-up crank rod is hinged with the follow-up rocker end arm;

a third clutch is arranged between the second follow-up crank rod and the second follow-up driving motor, and a third speed reducer is arranged between the third clutch and the second follow-up driving motor;

the second follow-up crank rod is connected with a third clutch through a third clutch main shaft, and the third speed reducer is connected with a second follow-up driving motor through a third coupling;

the third clutch main shaft is connected with the second follow-up crank rod through a third flange, and the third flange is fixed with the second follow-up crank rod through a third flange bolt assembly.

The driving connecting rod is formed by splicing three sections of square pipes, a first rectangular connecting ring is fixedly welded on the end face of each section of connected square pipe, each section of connected square pipe is connected through the first rectangular connecting ring, and the connected first rectangular connecting rings are fixedly connected through matched first connecting ring nuts and first connecting ring bolts;

the two connected first rectangular connecting rings are fixedly connected through eight groups of first connecting ring nuts and first connecting ring bolts, and the eight groups of first connecting ring nuts and first connecting ring bolts are uniformly distributed on the first rectangular connecting rings;

The follow-up connecting rod is formed by splicing three sections of square pipes, a second rectangular connecting ring is fixedly welded on the end face of each section of connected square pipe, each section of connected square pipe is connected through the second rectangular connecting ring, and the connected second rectangular connecting rings are fixedly connected through matched second connecting ring nuts and second connecting ring bolts;

the two connected second rectangular connecting rings are fixedly connected through eight groups of second connecting ring nuts and second connecting ring bolts, and the eight groups of second connecting ring nuts and second connecting ring bolts are uniformly distributed on the second rectangular connecting rings.

The bottom of the first blade clamp is provided with a U-shaped plate, three groups of round holes are correspondingly formed in two corresponding sides of the U-shaped plate, the three groups of round holes are transversely and uniformly arranged on the U-shaped plate, and the three groups of round holes are respectively a first round hole group, a second round hole group and a third round hole group.

The second round hole group is hinged with the telescopic threaded pipe, and the second follow-up connecting rod is connected with the driving connecting rod through a third lug plate.

The driving motor group is arranged on a first platform, the first platform is fixed on the horizontal ground below the blade through first ground riveting bolts, the first platform is symmetrically provided with a first base and a second base through bolt assemblies, the first base is provided with a first driving motor, and the second base is provided with a second driving motor;

The second platforms are fixed on the horizontal ground below the blades through second ground riveting bolts, the second platforms are symmetrically provided with a third base and a fourth base through bolt assemblies, the third base is provided with a second follow-up driving motor, and the fourth base is provided with a first follow-up driving motor;

the first platform and the second platform are symmetrically arranged; the first base and the second base are symmetrically arranged; the third base and the fourth base are symmetrically arranged.

The end of the driving rocker screw extending out of the driving rocker end cover is provided with a first rotating hole, a first bearing is arranged on the inner side of the center of the driving rocker end cover, the driving rocker screw penetrates through the first bearing, a first limit clamp spring is arranged between the driving rocker screw and the first bearing, the end of the driving rocker screw extending out of the driving rocker end cover is sleeved with a first positioning nut, and the first positioning nut is tightly attached to the driving rocker end cover.

The second rotating hole is formed in one end, extending out of the follow-up rocker end cover, of the follow-up rocker lead screw, the second bearing is mounted on the inner side of the center of the follow-up rocker end cover, the follow-up rocker lead screw penetrates through the second bearing, the second limiting clamp spring is arranged between the follow-up rocker lead screw and the second bearing, the second positioning nut is sleeved on one end, extending out of the follow-up rocker end cover, of the follow-up rocker lead screw, and the second positioning nut is tightly attached to the follow-up rocker end cover.

The driving connecting rod is arranged at one end of the driving connecting rod through a first connecting rod end cover, and a first pin sleeve is welded at the tail end of the driving connecting rod;

the driving rocker sliding nut is fixedly connected with a first lug plate through a first set screw, and a shaft hole is formed in the first lug plate;

the first pin sleeve is installed in the first ear plate in a matched mode, the first pin shaft penetrates through the first ear plate and the first pin sleeve, and a first clamp spring is arranged between the first pin shaft and the first ear plate.

The rectangular plate is fixed inside the driving connecting rod through a rectangular plate screw.

The first clutch, the second clutch, the third clutch and the fourth clutch are respectively and electrically connected with the control cabinet.

The vertical direction testing method of the device comprises the following implementation steps:

the blade is initially horizontally stationary, and the vertical direction is the flapping direction of the blade; the following crank group rotates anticlockwise and the driving crank group rotates clockwise, the following rocking bars are respectively driven to rotate anticlockwise, the driving rocking bars rotate clockwise and then drive the following connecting rods to move leftwards and downwards and the driving connecting rods to move rightwards and downwards, the relative positions of the telescopic threaded rods and the driving connecting rods are kept unchanged, and at the moment, the blades vertically swing downwards along with the first blade clamp;

When the blades swing downwards to the limit position of the waving direction, the blades rebound upwards, and at the moment, the control cabinet sends out a command to disconnect the first clutch, the second clutch, the third clutch and the fourth clutch, the torque of the driving motor group and the torque of the follow-up driving motor group cannot be transmitted to the driving crank group and the follow-up crank group, and the blades restore elastic deformation to swing upwards and pull the driving connecting rod, the follow-up connecting rod, the driving rocker, the follow-up rocker, the driving crank group and the follow-up crank group to move reversely;

when the blade rebounds upwards to the limit position and then rebounds downwards again, but because of the non-negligible system damping in the vibration process of the blade, the amplitude of the downward rebound of the blade is difficult to reach the limit position in the flapping direction, so when the blade rebounds downwards and exceeds the initial horizontal position, the control cabinet sends out an instruction to connect the first clutch, the second clutch, the third clutch and the fourth clutch, the torque of the driving motor unit and the follow-up driving motor unit is transferred to the driving crank unit and the follow-up crank unit again, the follow-up crank unit rotates anticlockwise again, and the driving crank unit rotates clockwise again, so that downward pulling force is provided for the first blade clamp and the blade; until the blade moves downwards to the limit position of the waving direction, the control cabinet sends out a command again to disconnect the first clutch, the second clutch, the third clutch and the fourth clutch again, so that the torque of the driving motor unit and the torque of the follow-up driving motor unit cannot be transmitted to the driving crank unit and the follow-up crank unit, the blade rebounds upwards again under the action of elasticity, and the process is repeated continuously, so that the bending fatigue test of the blade in the waving direction can be completed.

The horizontal direction testing method of the device comprises the following implementation steps:

the blade is initially horizontally stationary, and the horizontal direction is the shimmy direction of the blade; the driving crank set and the follow-up crank set rotate anticlockwise, so that the driving rocker and the follow-up rocker are driven to rotate anticlockwise, the follow-up connecting rod is driven to move leftwards and upwards, the relative position of the telescopic threaded rod and the driving connecting rod is kept unchanged, the blade swings leftwards along with the horizontal direction of the first blade clamp, the blade bounces rightwards when swinging leftwards to the limit position of the shimmy direction, at the moment, the control cabinet sends out a command to disconnect the first clutch, the second clutch, the third clutch and the fourth clutch, so that the torque of the driving motor set and the follow-up driving motor set cannot be transmitted to the driving crank set and the follow-up crank set, and the blade resumes elastic deformation to swing rightwards and sequentially pulls the driving connecting rod, the follow-up connecting rod, the driving rocker, the follow-up rocker and the driving crank set and the follow-up crank set to move reversely;

when the blade rebounds rightwards to the limit position, the blade rebounds leftwards again, but because the blade has non-negligible system damping in the process of vibrating in the shimmy direction, the amplitude of the rightward rebound of the blade is difficult to reach the shimmy direction limit position, so when the blade rebounds rightwards again and exceeds the initial horizontal position, the control cabinet sends out a command to connect the first clutch, the second clutch, the third clutch and the fourth clutch, so that the torque of the driving motor unit and the follow-up driving motor unit is transferred to the driving crank unit and the follow-up crank unit again, and the driving crank unit and the follow-up crank unit rotate anticlockwise again, thereby providing leftwards pulling force for the first blade clamp and the blade; until the blade moves leftwards to the limit position of the shimmy direction, the control cabinet sends out a command again to disconnect the first clutch, the second clutch, the third clutch and the fourth clutch again, so that the torque of the driving motor group and the torque of the follow-up driving motor group cannot be transmitted to the driving crank group and the follow-up crank group, the blade rebounds rightwards again under the action of elasticity, and the process is repeated continuously, so that the bending fatigue test of the blade in the shimmy direction can be completed.

The invention relates to a method for testing waving and shimmy bidirectionally, which comprises the following implementation steps:

the driving crank group and the follow-up crank group on the left side and the right side are enabled to rotate clockwise to drive the driving rocker and the follow-up rocker to rotate clockwise, then the follow-up connecting rod is driven to move upwards and upwards to the right, meanwhile, the driving connecting rod moves downwards and downwards to the right, the servo motor is started to change the position of the telescopic threaded rod relative to the driving connecting rod, and the blades swing upwards and to the right along with the first blade clamp according to a preset curve track; when the blade swings to the right and above to the limit position of the preset track, the active driving motor group and the follow-up driving motor group reversely rotate, so that the active crank group, the follow-up crank group, the active rocker, the follow-up connecting rod and the active connecting rod are sequentially driven to reversely move, the servo motor continuously acts and continuously adjusts the position of the telescopic threaded rod relative to the active connecting rod, and the movement track when the blade returns is matched with the preset track; after the blades return to the limit position to the left and the lower, the active driving motor group and the follow-up driving motor group rotate forward again, so that the active crank group, the follow-up crank group, the active rocker, the follow-up connecting rod and the active connecting rod are sequentially driven to move forward, the servo motor continuously acts and continuously adjusts the position of the telescopic threaded rod relative to the active connecting rod, the track of the movement of the blades to the right and the upper is matched with the preset track, and the process is continuously repeated, so that the blades can simultaneously realize bending fatigue tests in two directions of waving and shimmy according to the preset track.

The torsion testing method of the device comprises the following implementation steps:

the telescopic threaded pipe is connected with one end of the driving connecting rod through a guide sleeve, one end of the telescopic threaded pipe is connected with the third round hole group, and the other end of the telescopic threaded pipe is connected with the servo motor through a telescopic threaded rod; the driving connecting rod is internally and fixedly provided with a rectangular plate, the servo motor is fixedly arranged on the rectangular plate, and the output end of the servo motor penetrates through the rectangular plate and is connected with the input end of the telescopic threaded rod;

the second follow-up connecting rod is connected with the first round hole group;

the follow-up connecting rod is connected with the first blade clamp through the first round hole group and the fifth pin shaft in a matching way; the driving rocker is matched with the first blade clamp through a sixth pin shaft and a third round hole group; when the height of the follow-up connecting rod and the height of the driving connecting rod are asymmetric relative to the blade, the first blade clamp rotates, and then the blade is twisted.

Under the condition that the blade is twisted, the driving crank set and the follow-up crank set reversely rotate, and the relative positions of the telescopic threaded rod and the driving connecting rod are kept unchanged, so that the fatigue test of waving bending and twisting of the blade is realized;

when the blade is twisted, the driving crank group and the follow-up crank group rotate in the same direction, and the relative positions of the telescopic threaded rod and the driving connecting rod are kept unchanged, so that the fatigue test of 'shimmy bending+torsion' of the blade is realized; under the condition that the blade is twisted, the driving crank set and the follow-up crank set are controlled to swing in a reciprocating manner, the position of the telescopic threaded rod relative to the driving connecting rod is continuously adjusted through the servo motor, so that the blade vibrates in a reciprocating manner according to a preset curve track, and then the fatigue test of the blade such as waving bending, shimmy bending and twisting is realized.

The multifunctional fatigue testing device for the blade has the beneficial effects that:

1. compared with the traditional wind power blade fatigue testing device, the wind power blade fatigue testing device does not need to greatly increase additional mass on the blade, has high blade vibration frequency, shorter testing time and lower testing cost;

2. when the existing bidirectional loading method loads in the waving and shimmy directions simultaneously, the movement track of the blade is disordered, the movement and damage in the two directions are coupled with each other, and the decoupling difficulty is high; in the bidirectional loading process, the motion track of the blade is a preset track, so that the damage decoupling is convenient;

3. in the existing blade fatigue test method, the loading point is positioned in the middle part or the blade tip of the blade, most of the area of the blade is difficult to reach the test bending moment, and the bending moment distribution is discontinuous; the invention loads near the blade root and weights near the blade tip, so that most areas of the blade reach test bending moment, and the bending moment distribution is more continuous;

4. in the existing blade fatigue test method, the torsional fatigue test is difficult to integrate, and the torsional fatigue test is high in cost and long in period, and is difficult to be accepted by the market; the invention can not only realize the waving bending, the shimmy bending and the torsion fatigue test independently, but also realize the comprehensive test of three forms of waving bending and torsion, shimmy bending and torsion, waving bending and shimmy bending and torsion;

5. In the existing forced blade fatigue test device, the motor needs to continuously output power, and the electric energy consumption is high; when the fatigue test in the flapping and shimmy directions is independently carried out, the common asynchronous motor is selected, the reciprocating vibration characteristics of the blades are fully utilized by controlling the on-off of the clutch, so that the motor does not exert force in the process of recovering the elastic deformation of the blades, and only the vibration of the blades approaches to the preset vibration amplitude, the force is exerted to supplement the vibration amplitude reduction caused by the system damping, thereby greatly reducing the electric energy consumption;

6. the existing blade fatigue testing device has the defects that the exciting force is difficult to meet the requirement along with the continuous increase of the blade size, the defect can be overcome only by multi-point loading, but the multi-point loading has the defects of large additional mass, long testing period, difficult synchronous control of a motor and the like; the invention adopts a mode of mounting four motors in pairs, has large power range, can meet the excitation force requirement of larger blades, and has wide application prospect.

Drawings

FIG. 1 is a three-dimensional block diagram of a device according to the present invention;

FIG. 2 is a partial enlarged view of a first platform and a second platform of the device according to the present invention;

FIG. 3 is a partial enlarged view of a second stage of the first stage and the second stage of the apparatus of the present invention;

FIG. 4 is a front cross-sectional view of the device of the present invention;

FIG. 5 is a left side view of the device of the present invention;

FIG. 6 is an enlarged view of FIG. 4 at A;

FIG. 7 is a cross-sectional view of the drive link B of FIG. 4;

FIG. 8 is a cross-sectional view of the follower link B1 of FIG. 4;

FIG. 9 is an enlarged view of FIG. 4 at C;

FIG. 10 is an enlarged view at C1 of FIG. 4;

FIG. 11 is an enlarged view of FIG. 4 at D;

FIG. 12 is an enlarged view of D1 of FIG. 4;

FIG. 13 is a cross-sectional view of the drive link E of FIG. 4;

FIG. 14 is a cross-sectional view of the follower link E1 of FIG. 4;

fig. 15 is an enlarged view of F in fig. 5;

FIG. 16 is a schematic diagram of a mechanism for achieving blade flapwise loading in accordance with the method of the present invention;

FIG. 17 is a schematic diagram of a mechanism for achieving blade lag direction loading in accordance with the method of the present invention;

FIG. 18 is a schematic diagram of a mechanism for achieving blade flapping and edgewise bi-directional loading in accordance with the method of the present invention;

FIG. 19 is a schematic diagram of a mechanism for achieving blade torsional loading in accordance with the method of the present invention;

in the figure: 1-first platform, 1-second platform, 2-blade, 3-counterweight, 4-first reducer, 4-1-second reducer, 4-2-third reducer, 4-3-fourth reducer, 5-follower link, 6-first blade clamp, 7-drive link, 8-control cabinet, 9-drive rocker, 9-1-follower rocker, 10-drive crank set, 1011-first drive crank lever, 1012-second drive crank lever, 10-1-follower crank set, 1011-1-first follower crank lever, 1012-1-second follower crank lever;

11-active drive motor group, 111-first active drive motor, 112-second active drive motor, 11-1-follow-up drive motor group, 111-1-first follow-up drive motor, 112-1-second follow-up drive motor, 12-first clutch, 12-1-second clutch, 12-2-third clutch, 12-3-fourth clutch, 13-first rivet bolt, 13-1-second rivet bolt, 14-active rocker end arm, 14-1-follow-up rocker end arm, 15-active rocker slide nut, 15-1-follow-up rocker slide nut, 16-first positioning nut, 16-1-second positioning nut, 17-active rocker end cap, 17-1-follow-up rocker end cap, 18-first pin sleeve, 18-1-second pin sleeve, 18-2-third pin sleeve, 18-3-fourth pin sleeve, 18-4-fifth pin sleeve, 19-active connecting rod, 19-1-first follow-up connecting rod, 19-2-second follow-up connecting rod;

20-first rectangular connecting ring, 20-1-second rectangular connecting ring, 21-first pin, 21-1-second pin, 21-2-third pin, 21-3-fourth pin, 21-4-fifth pin, 21-5-sixth pin, 22-large pull rod assembly, 22-1-small pull rod assembly, 23-U-shaped plate, 23-1-first round hole set, 23-2-second round hole set, 23-3-third round hole set, 24-large shaped plate, 25-telescopic threaded tube, 26-guide sleeve, 27-telescopic threaded rod, 28-servo motor, 29-first link end cover, 29-1-second link end cover, 29-2-third link end cover;

30-first ear plate, 30-1-second ear plate, 30-2-third ear plate, 31-active rocker lead screw, 31-1-follower rocker lead screw, 32-first connection block, 32-1-second connection block, 33-first clutch spindle, 33-1-second clutch spindle, 33-2-third clutch spindle, 33-3-fourth clutch spindle, 34-bolt assembly, 35-frame, 36-small cam, 37-first snap spring, 37-1-second snap spring, 37-2-third snap spring, 37-3-fourth snap spring, 38-first base, 38-1-second base, 38-2-third base, 38-3-fourth base, 39-first coupler, 39-1-second coupler, 39-2-third coupler, 39-3-fourth coupler;

40-first flange, 40-1-second flange, 40-2-third flange, 40-3-fourth flange, 41-rectangular plate screw, 42-rectangular plate, 43-first connecting ring nut, 43-1-second connecting ring nut, 44-first connecting ring bolt, 44-1-second connecting ring bolt, 45-first rotating hole, 45-1-second rotating hole, 46-first limit clamp spring, 46-1-second limit clamp spring, 47-first bearing, 47-1-second bearing, 48-first connecting screw, 48-1-second connecting screw, 48-2-third connecting screw, 48-3-fourth connecting screw, 49-first set screw, 49-1-second set screw;

50-first flange bolt assembly, 50-1-second flange bolt assembly, 50-2-third flange bolt assembly, 50-3-fourth flange bolt assembly.

Detailed Description

Example 1: the following describes embodiments of the present invention in detail with reference to fig. 1-16.

The invention relates to a multifunctional fatigue testing device for a blade, which comprises a frame 35, wherein the root of the blade 2 is fixed on the frame 35, and the blade 2 is connected with an excitation driving module and a counterweight device 3;

the excitation driving module comprises a first blade clamp 6, a driving connecting rod and a driving motor, wherein the first blade clamp 6 is arranged at the middle section of the blade 2, and the bottom of the first blade clamp 6 is connected with the driving connecting rod; the driving connecting rod is connected with a driving motor;

the driving connecting rod comprises an active driving module and a follow-up driving module; the driving motor comprises an active driving motor group 11 and a follow-up driving motor group 11-1;

the active driving module comprises an active connecting rod 7, an active rocker 9 and an active crank set 10, wherein the active connecting rod 7 is connected with the active rocker 9, and the active rocker 9 is connected with the active crank set 10;

the driving connecting rod 7 is a hollow square tube, one end of the driving connecting rod is provided with a telescopic threaded tube 25, and the other end of the driving connecting rod is provided with a driving connecting rod 19;

The sliding assembly is arranged on the driving rocker 9 and comprises a driving rocker screw rod 31 and a driving rocker sliding nut 15 matched with the driving rocker screw rod 31, the driving rocker sliding nut 15 is connected with a driving connecting rod 19, one end of the driving rocker 9 is provided with a driving rocker end arm 14, and the other end of the driving rocker 9 is provided with a driving rocker end cover 17;

the driving crank set 10 is composed of two driving crank rods which are correspondingly arranged, namely a first driving crank rod 1011 and a second driving crank rod 1012;

the active driving motor unit 11 is composed of two active driving motors which are correspondingly arranged, namely a first active driving motor 111 and a second active driving motor 112;

one end of the first driving crank lever 1011 is connected with the driving crank arm 14, and the other end is connected with the first driving motor 111; one end of the second driving crank lever 1012 is connected with the driving crank lever arm 14, and the other end is connected with the second driving motor 112;

the follow-up driving module comprises a follow-up connecting rod 5, a follow-up rocker 9-1 and a follow-up crank set 10-1; the follow-up connecting rod 5 is connected with the follow-up rocker 9-1, and the follow-up rocker 9-1 is connected with the follow-up crank set 10-1;

the follow-up connecting rod 5 is a hollow square tube, one end of the follow-up connecting rod is provided with a first follow-up connecting rod 19-1, and the other end of the follow-up connecting rod is provided with a second follow-up connecting rod 19-2;

The follow-up rocker 9-1 is provided with a sliding component, the sliding component comprises a follow-up rocker lead screw 31-1 and a follow-up rocker sliding nut 15-1 matched with the follow-up rocker lead screw 31-1, the follow-up rocker sliding nut 15-1 is connected with a first follow-up connecting rod 19-1, one end of the follow-up rocker 9-1 is provided with a follow-up rocker end arm 14-1, and the other end of the follow-up rocker 9-1 is provided with a follow-up rocker end cover 17-1;

the following crank group 10-1 consists of two corresponding following crank rods, namely a first following crank rod 1011-1 and a second following crank rod 1012-1;

the follow-up driving motor group 11-1 consists of two follow-up driving motors which are correspondingly arranged, namely a first follow-up driving motor 111-1 and a second follow-up driving motor 112-1;

one end of the first follow-up crank rod 1011-1 is connected with the follow-up crank arm 14-1, and the other end is connected with the first follow-up driving motor 111-1; one end of the second follow-up crank arm 1012-1 is connected with the follow-up crank arm 14-1, and the other end is connected with the second follow-up driving motor 112-1.

The telescopic threaded pipe 25 is connected with one end of the driving connecting rod 7 through a guide sleeve 26, one end of the telescopic threaded pipe 25 is connected with the first blade clamp 6, and the other end of the telescopic threaded pipe 25 is connected with the servo motor 28 through a telescopic threaded rod 27; the inside of initiative connecting rod 7 is fixed and is provided with rectangular plate 42, servo motor 28 fixed mounting on rectangular plate 42, servo motor 28's output runs through rectangular plate 42 and is connected with telescopic threaded rod 27's input.

The initiative rocker 9 is C type channel-section steel structure, the slip matches in C type channel-section steel structure and sets up initiative rocker slide nut 15, runs through and is provided with initiative rocker lead screw 31 on the initiative rocker end cover 17, and initiative rocker lead screw 31 runs through slide nut 15, slide nut 15 can slide in C type channel-section steel structure through initiative rocker lead screw 31.

The first driving crank rod 1011 and the second driving crank rod 1012 are fixedly connected through the first connecting block 32, the first driving crank rod 1011 and the first connecting block 32 are fixed through a plurality of first connecting screws 48, and the second driving crank rod 1012 and the first connecting block 32 are fixed through a plurality of second connecting screws 48-1;

the first driving crank lever 1011 is hinged with the driving rocker end arm 14;

a first clutch 12 is arranged between the first driving crank lever 1011 and the first driving motor 111, and a first speed reducer 4 is arranged between the first clutch 12 and the first driving motor 111;

the first driving crank lever 1011 is connected with the first clutch 12 through the first clutch main shaft 33, and the first decelerator 4 is connected with the first driving motor 111 through the first coupling 39;

the first clutch main shaft 33 is connected with a first driving crank rod 1011 through a first flange 40, and the first flange 40 and the first driving crank rod 1011 are fixed through a first flange bolt assembly 50;

The second driving crank lever 1012 is hinged with the driving rocker end arm 14;

a second clutch 12-1 is arranged between the second driving crank lever 1012 and the second driving motor 112, and a second speed reducer 4-1 is arranged between the second clutch 12-1 and the second driving motor 112;

the second driving crank lever 1012 is connected with the second clutch 12-1 through a second clutch main shaft 33-1, and the second speed reducer 4-1 is connected with the second driving motor 112 through a second coupling 39-1;

the second clutch main shaft 33-1 is connected to the second driving crank arm 1012 by a second flange 40-1, and the second flange 40-1 is fixed to the second driving crank arm 1012 by a second flange bolt assembly 50-1.

The follow-up rocker 9-1 is of a C-shaped channel steel structure, the follow-up rocker sliding nut 15-1 is arranged in a sliding matching mode in the C-shaped channel steel structure, the follow-up rocker end cover 17-1 is penetrated and provided with a follow-up rocker screw 31-1, the follow-up rocker screw 31-1 penetrates through the follow-up rocker sliding nut 15-1, and the follow-up rocker sliding nut 15-1 can slide in the C-shaped channel steel structure through the follow-up rocker screw 31-1.

The first follow-up crank rod 1011-1 and the second follow-up crank rod 1012-1 are fixedly connected through the second connecting block 32-1, the first follow-up crank rod 1011-1 and the second connecting block 32-1 are fixed through a plurality of fourth connecting screws 48-3, and the second follow-up crank rod 1012-1 and the second connecting block 32-1 are fixed through a plurality of third connecting screws 48-2;

The first follow-up crank rod 1011-1 is hinged with the follow-up rocker end arm 14-1;

a fourth clutch 12-3 is arranged between the first follow-up crank rod 1011-1 and the first follow-up driving motor 111-1, and a fourth speed reducer 4-3 is arranged between the fourth clutch 12-3 and the first follow-up driving motor 111-1;

the first follower crank lever 1011-1 is connected with the fourth clutch 12-3 through the fourth clutch main shaft 33-3, and the fourth decelerator 4-3 is connected with the first follower drive motor 111-1 through the fourth coupling 39-3;

the fourth clutch main shaft 33-3 is connected with the first follower crank lever 1011-1 through a fourth flange 40-3, and the fourth flange 40-3 is fixed with the first follower crank lever 1011-1 through a fourth flange bolt assembly 50-3;

the second follow-up crank lever 1012-1 is hinged with the follow-up rocker end arm 14-1;

a third clutch 12-2 is arranged between the second follow-up crank rod 1012-1 and the second follow-up driving motor 112-1, and a third speed reducer 4-2 is arranged between the third clutch 12-2 and the second follow-up driving motor 112-1;

the second follow-up crank lever 1012-1 is connected with the third clutch 12-2 through a third clutch main shaft 33-2, and the third speed reducer 4-2 is connected with the second follow-up driving motor 112-1 through a third coupler 39-2;

The third clutch main shaft 33-2 is connected to the second follower crank lever 1012-1 by a third flange 40-2, and the third flange 40-2 is secured to the second follower crank lever 1012-1 by a third flange bolt assembly 50-2.

The driving connecting rod 7 is formed by splicing three sections of square pipes, the end face of each section of connected square pipe is fixedly welded with a first rectangular connecting ring 20, each section of connected square pipe is connected through the first rectangular connecting ring 20, and the connected first rectangular connecting rings 20 are fixedly connected through matched first connecting ring nuts 43 and first connecting ring bolts 44;

the two connected first rectangular connecting rings 20 are fixedly connected through eight groups of first connecting ring nuts 43 and first connecting ring bolts 44, and the eight groups of first connecting ring nuts 43 and first connecting ring bolts 44 are uniformly distributed on the first rectangular connecting rings 20;

the follow-up connecting rod 5 is formed by splicing three sections of square pipes, the end face of each section of connected square pipe is fixedly welded with a second rectangular connecting ring 20-1, each section of connected square pipe is connected through the second rectangular connecting ring 20-1, and the connected second rectangular connecting rings 20-1 are fixedly connected through matched second connecting ring nuts 43-1 and second connecting ring bolts 44-1;

the two connected second rectangular connecting rings 20-1 are fixedly connected through eight groups of second connecting ring nuts 43-1 and second connecting ring bolts 44-1, and the eight groups of second connecting ring nuts 43-1 and second connecting ring bolts 44-1 are uniformly distributed on the second rectangular connecting rings 20-1.

The bottom of the first blade clamp 6 is provided with a U-shaped plate 23, three groups of round holes are correspondingly formed in two corresponding sides of the U-shaped plate 23, the three groups of round holes are transversely and uniformly arranged on the U-shaped plate 23, and the three groups of round holes are respectively a first round hole group 23-1, a second round hole group 23-2 and a third round hole group 23-3.

The second round hole group 23-2 is hinged with the telescopic threaded pipe 25, and the second follow-up connecting rod 19-2 is connected with the driving connecting rod 7 through the third lug plate 30-2.

The active driving motor unit 11 is installed on the first platform 1, the first platform 1 is fixed on the horizontal ground below the blade 2 through first ground riveting bolts 13, the first platform 1 is symmetrically provided with a first base 38 and a second base 38-1 through a bolt assembly 34, the first base 38 is provided with a first active driving motor 111, and the second base 38-1 is provided with a second active driving motor 112;

the follow-up driving motor unit 11-1 is mounted on a second platform 1-1, the second platform 1-1 is fixed on the horizontal ground below the blade 2 through second ground riveting bolts 13-1, the second platform 1-1 is symmetrically provided with a third base 38-2 and a fourth base 38-3 through a bolt assembly 34, the third base 38-2 is provided with a second follow-up driving motor 112-1, and the fourth base 38-3 is provided with a first follow-up driving motor 111-1;

The first platform 1 and the second platform 1-1 are symmetrically arranged; the first base 38 and the second base 38-1 are symmetrically installed; the third mount 38-2 and the fourth mount 38-3 are symmetrically mounted.

The end of the driving rocker screw rod 31 extending out of the driving rocker end cover 17 is provided with a first rotating hole 45, the inner side of the center of the driving rocker end cover 17 is provided with a first bearing 47, the driving rocker screw rod 31 penetrates through the first bearing 47, a first limit clamp spring 46 is arranged between the driving rocker screw rod 31 and the first bearing 47, the end of the driving rocker screw rod 31 extending out of the driving rocker end cover 17 is sleeved with a first positioning nut 16, and the first positioning nut 16 is tightly attached to the driving rocker end cover 17.

The end, extending out of the follow-up rocker end cover 17-1, of the follow-up rocker lead screw 31-1 is provided with a second rotating hole 45-1, the inner side of the center of the follow-up rocker end cover 17-1 is provided with a second bearing 47-1, the follow-up rocker lead screw 31-1 penetrates through the second bearing 47-1, a second limit clamp spring 46-1 is arranged between the follow-up rocker lead screw 31-1 and the second bearing 47-1, the end, extending out of the follow-up rocker lead screw 31-1, of the follow-up rocker end cover 17-1 is sleeved with a second positioning nut 16-1, and the second positioning nut 16-1 is tightly attached to the follow-up rocker end cover 17-1.

The driving connecting rod 19 is arranged at one end of the driving connecting rod 7 through a first connecting rod end cover 29, and a first pin sleeve 18 is welded at the tail end of the driving connecting rod 19;

The driving rocker sliding nut 15 is fixedly connected with the first ear plate 30 through a first set screw 49, and a shaft hole is formed in the first ear plate 30;

the first pin sleeve 18 is installed in the first ear plate 30 in a matched mode, the first pin shaft 21 penetrates through the first ear plate 30 and the first pin sleeve 18, and a first clamp spring 37 is arranged between the first pin shaft 21 and the first ear plate 30.

The rectangular plate 42 is fixed inside the driving link 7 by a rectangular plate screw 41.

The first follow-up connecting rod 19-1 is arranged at one end of the follow-up connecting rod 5 through a second connecting rod end cover 29-1, and a fourth pin sleeve 18-3 is welded at the tail end of the first follow-up connecting rod 19-1;

the second follow-up connecting rod 19-2 is arranged at the other end of the follow-up connecting rod 5 through a third connecting rod end cover 29-2, and a fifth pin sleeve 18-4 is welded at the tail end of the second follow-up connecting rod 19-2;

the follower rocker sliding nut 15-1 is fixedly connected with the second lug plate 30-1 through a second set screw 49-1, and a shaft hole is formed in the second lug plate 30-1;

the fourth pin sleeve 18-3 is installed in the second ear plate 30-1 in a matching mode, the fourth pin shaft 21-3 penetrates through the second ear plate 30-1 and the fourth pin sleeve 18-3, and a fourth clamp spring 37-3 is arranged between the fourth pin shaft 21-3 and the second ear plate 30-1.

The first clutch 12, the second clutch 12-1, the third clutch 12-2 and the fourth clutch 12-3 are respectively and electrically connected with the control cabinet 8.

The large profile plate 24 is wrapped outside the blade 2 and is embedded with the middle section shape of the blade 2, the large pull rod assembly 22 consists of four pull rods, and the four pull rods are arranged at four corners of the large profile plate 24 and fix the large profile plate 24 on the blade 2;

the small cam 36 is wrapped outside the blade 2 and is embedded with the shape of the tail section of the blade 2, the small pull rod assembly 22-1 consists of four pull rods, and the four pull rods are arranged at four corners of the small cam 36 and fix the small cam 36 on the blade 2;

a second pin shaft 21-1 is inserted into a through hole at the upper end of the driving crank set 10 through a second clamp spring 37-1, a second pin sleeve 18-1 is sleeved on the second pin shaft 21-1, and the second pin sleeve 18-1 is fixedly welded with the driving rocker end arm 14;

a third pin shaft 21-2 is inserted into a through hole at the upper end of the follow-up crank set 10-1 through a third clamp spring 37-2, a third pin sleeve 18-2 is sleeved on the third pin shaft 21-2, and the third pin sleeve 18-2 is fixedly welded with the follow-up rocker end arm 14-1;

the control cabinet 8 is internally provided with an electrical control element.

The upper end of the driving rocker screw rod 31 is vertically provided with a first rotating hole 45, when a rod-shaped object is inserted into the first rotating hole 45 and rotates, the driving rocker screw rod 31 rotates, so that the driving rocker sliding nut 15 is driven to slide in the driving rocker 9, the first lug plate 30 is driven to move on the upper side surface of the driving rocker 9, and finally the positions of the follow-up connecting rod 5 and the driving connecting rod 7 relative to the driving rocker 9 are changed; the driving rocker screw rod 31 is sleeved with the first positioning nut 16, and when the driving rocker screw rod 31 stops rotating, the first positioning nut 16 is attached to the driving rocker end cover 17, so that the position of the driving rocker sliding nut 15 is fixed.

The motion principle of the follow-up rocker screw 31-1 is the same as that of the previous one;

when the first clutch main shaft 33 rotates, the first flange 40 is driven to rotate through the spline, and when the second clutch main shaft 33-1 rotates, the second flange 40-1 is driven to rotate through the spline, so that the driving crank set 10 is driven to rotate; the motion principle of the following crank set 10-1 is the same as that of the following crank set.

the blade 2 is initially stationary horizontally, and the vertical direction is the flapping direction of the blade 2; the following crank set 10-1 rotates anticlockwise while the driving crank set 10 rotates clockwise, the following rocking bars 9-1 are respectively driven to rotate anticlockwise while the driving rocking bars 9 rotate clockwise, the following connecting rods 5 are driven to move leftwards and downwards while the driving connecting rods 7 move rightwards, the relative positions of the telescopic threaded rods 27 and the driving connecting rods 7 are kept unchanged, and at the moment, the blades 2 vertically swing downwards along with the first blade clamps 6;

when the blade 2 swings downwards to the limit position of the waving direction, the blade rebound upwards, at the moment, the control cabinet 8 sends an instruction to disconnect the first clutch 12, the second clutch 12-1, the third clutch 12-2 and the fourth clutch 12-3, the torque of the driving motor group 11 and the follow-up driving motor group 11-1 cannot be transmitted to the driving crank group 10 and the follow-up crank group 10-1, the blade 2 recovers elastic deformation to swing upwards and pulls the driving connecting rod 7, the follow-up connecting rod 5, the driving rocker 9, the follow-up rocker 9-1, the driving crank group 10 and the follow-up crank group 10-1 to move reversely;

When the blade 2 rebounds upwards to the limit position and then rebounds downwards again, but because of the non-negligible system damping existing in the vibration process of the blade 2, the amplitude of the downward rebound of the blade 2 is difficult to reach the limit position in the flapping direction, so when the blade 2 rebounds downwards and exceeds the initial horizontal position, the control cabinet 8 gives out a command to connect the first clutch 12, the second clutch 12-1, the third clutch 12-2 and the fourth clutch 12-3, the torque of the driving motor group 11 and the follow-up driving motor group 11-1 is transferred to the driving crank group 10 and the follow-up crank group 10-1 again, the follow-up crank group 10-1 rotates anticlockwise again, and the driving crank group 10 rotates clockwise again, so that the downward pulling force is provided for the first blade clamp 6 and the blade 2; until the blade 2 moves downwards to the limit position of the waving direction, the control cabinet 8 sends out a command again to disconnect the first clutch 12, the second clutch 12-1, the third clutch 12-2 and the fourth clutch 12-3 again, so that the torque of the driving motor set 11 and the follow-up driving motor set 11-1 cannot be transmitted to the driving crank set 10 and the follow-up crank set 10-1, the blade 2 rebounds upwards again under the action of elasticity, and the process is repeated continuously, so that the bending fatigue test of the blade 2 in the waving direction can be completed.

Example 2: the multifunctional fatigue testing device for the blade has the structure shown in the embodiment 1, as shown in fig. 1-15 and 17;

the invention relates to a method for testing the shimmy direction of a device, which comprises the following implementation steps:

when the blade 2 is initially static and is in a central position in the horizontal direction, the horizontal direction is just the shimmy direction of the blade 2, when the driving crank set 10 and the follow-up crank set 10-1 are rotated anticlockwise, the driving rocker 9 and the follow-up rocker 9-1 are simultaneously driven to rotate anticlockwise, so that the follow-up connecting rod 5 is driven to move leftwards and downwards, the driving connecting rod 7 is driven to move leftwards and upwards, the relative position of the telescopic threaded rod 27 and the driving connecting rod 7 is kept unchanged, at the moment, the blade 2 swings leftwards along with the first blade clamp 6, when the blade 2 swings leftwards to the limit position of a shimmy direction fatigue test, the blade bounces rightwards, and in combination with fig. 1 and 3, the control cabinet 8 sends out a command to disconnect the first clutch 12, the second clutch 12-1, the third clutch 12-2 and the fourth clutch 12-3, so that the torque of the driving crank set 11 and the follow-up crank set 11-1 cannot be transmitted to the driving crank set 10 and the follow-up crank set 10-1, and the driving crank set 10-1 are sequentially pulled rightwards due to the fact that the blade 2 is required to resume elastic deformation to swing rightwards.

When the blade 2 rebounds to the right and then rebounds to the left again, but because the blade 2 has non-negligible system damping in the vibration process in the shimmy direction, the amplitude of the rebound of the blade 2 to the right is difficult to reach the limit position of the fatigue test in the shimmy direction, so when the blade 2 rebounds to the right again and exceeds the initial centering position, the control cabinet 8 gives out a command again to reconnect the first clutch 12, the second clutch 12-1, the third clutch 12-2 and the fourth clutch 12-3, the torque of the driving motor group 11 and the follow-up driving motor group 11-1 is transferred to the driving crank group 10 and the follow-up crank group 10-1 again, the driving crank group 10 and the follow-up crank group 10-1 rotate anticlockwise again, and accordingly, the leftward pulling force is provided for the first blade clamp 6 and the blade 2, and when the blade 2 moves to the limit position of the fatigue test in the shimmy direction again, the control cabinet 8 gives out a command again to disconnect the first clutch 12, the second clutch 12-1, the third clutch 12-2 and the fourth clutch 12-3 again, the torque of the driving motor group 11 and the follow-up driving motor group 11-1 is disconnected again, the torque of the driving motor group 11 and the follow-up driving motor group 11 cannot rebound in the vibration process to the right again, and the vibration process of the blade 2 cannot be repeatedly and the vibration process is completed, and the vibration process of the vibration of the blade group 10 and the vibration is not transferred to the vibration process in the vibration direction to the vibration direction and the vibration direction is repeated.

Example 3: the invention relates to a multifunctional fatigue testing device for a blade, which has the structure shown in an embodiment 1 and an embodiment 2, and is shown in fig. 1-18;

the driving crank set 10 and the follow-up crank set 10-1 rotate clockwise, and simultaneously drive the driving rocker 9 and the follow-up rocker 9-1 to rotate clockwise, so that the follow-up connecting rod 5 is driven to move upwards and downwards to the right, the servo motor 28 is started, the position of the telescopic threaded rod 27 relative to the driving connecting rod 7 is changed, the blade 2 swings along with the first blade clamp 6 upwards and rightwards according to a set curve track, when the blade 2 swings upwards and rightwards to the limit position of a preset track, the driving motor set 11 and the follow-up driving motor set 11-1 rotate reversely, and accordingly the driving crank set 10, the follow-up crank set 10-1, the driving rocker 9, the follow-up rocker 9-1, the follow-up connecting rod 5 and the driving connecting rod 7 are sequentially driven to move reversely, the servo motor 28 is required to be kept to continuously act in the process, the position of the telescopic threaded rod 27 relative to the driving connecting rod 7 is continuously adjusted, and therefore the rebound movement track of the blade 2 is enabled to coincide with the preset track.

After the blade 2 rebounds to the left and the lower side to the limit position, the active driving motor group 11 and the follow-up driving motor group 11-1 rotate forward again, so that the active crank group 10, the follow-up crank group 10-1, the active rocker 9, the follow-up rocker 9-1, the follow-up connecting rod 5 and the active connecting rod 7 are sequentially driven to move forward, rebound upwards to the right along with the blade 2, the servo motor 28 is kept to continuously act, the position of the telescopic threaded rod 27 relative to the active connecting rod 7 is continuously regulated, the track of the movement of the blade 2 upwards to the right is matched with the preset track, and the process is continuously repeated, so that the blade 2 can simultaneously realize bending fatigue tests in the two directions of waving and shimmy according to the preset track. During the period, the 12-first clutch, the 12-1-second clutch, the 12-2-third clutch and the 12-3-fourth clutch are always connected, and the action of the driving crank set 10 and the following crank set 10-1 always precedes the action of the driving rocker 9 and the following rocker 9-1, so that the reaction force of elastic vibration of the blade to the driving motor set 11 and the following driving motor set 11-1 is effectively reduced, and the service life of equipment is prolonged.

If the blade 2 only completes the bending fatigue test in the flapping or shimmy direction, the active driving motor set 11 and the follow-up driving motor set 11-1 select a common asynchronous motor, a stepping motor or a servo driving motor, and the common asynchronous motor is recommended to be selected in consideration of energy consumption saving. If the blade 2 needs to complete bending fatigue tests in both the flapping direction and the shimmy direction, the accuracy of the running track of the blade 2 is considered, and the active driving motor set 11 and the follow-up driving motor set 11-1 are servo driving motors.

Example 4: the multifunctional fatigue testing device for the blade has the structure shown in the embodiment 1, as shown in fig. 1-15 and fig. 19; when the first round hole group 23-1 is hinged with one end of the second follow-up connecting rod 19-2; the third round hole group 23-3 is hinged with the telescopic threaded pipe 25;

the follow-up connecting rod 5 is matched and connected with the first blade clamp 6 through the first round hole group 23-1 and the fifth pin shaft 21-4; the driving connecting rod 7 is connected with the first blade clamp 6 through matching of a sixth pin shaft 21-5 and a third round hole group 23-3;

when the follower link 5 and the drive link 7 are asymmetric with respect to the centre line of the blade 2, the first blade clamp 6 will rotate, which in turn will cause the blade 2 to twist.

Under the condition that the blade 2 is twisted, the driving crank set 10 and the following crank set 10-1 reversely rotate, and the relative positions of the telescopic threaded rod 27 and the driving connecting rod 7 are kept unchanged, so that the fatigue test of the blade 2 in terms of waving bending and twisting is performed; under the condition that the blade 2 is twisted, the driving crank set 10 and the following crank set 10-1 rotate in the same direction, and the relative positions of the telescopic threaded rod 27 and the driving connecting rod 7 are kept unchanged, so that the fatigue test of the blade 2 in the process of 'shimmy bending+torsion' is realized; under the condition that the blade 2 is twisted, the driving crank set 10 and the follow-up crank set 10-1 are controlled to swing reciprocally, and the position of the telescopic threaded rod 27 relative to the driving connecting rod 7 is continuously adjusted through the servo motor 28, so that the blade 2 vibrates reciprocally according to a preset curve track, and the fatigue test of the blade 2 such as waving bending, shimmy bending and twisting is realized;

When the fatigue tests of the two forms of waving bending and torsion and the two forms of shimmy bending and torsion are carried out, the active driving motor set 11 and the follow-up driving motor set 11-1 select common asynchronous motors or stepping motors, and when the fatigue test of waving bending, shimmy bending and torsion is completed, the active driving motor set 11 and the follow-up driving motor set 11-1 select servo driving motors.

The above is only an optimal embodiment of the present invention, and in practical use, the present invention can be flexibly adjusted according to the test requirements, so all other implementations proposed based on the above summary and the optimal embodiment are within the scope of the present invention.

Claims

1. The utility model provides a multi-functional fatigue test device of blade, includes frame (35), and blade (2) root is fixed on frame (35), its characterized in that: the blade (2) is connected with the excitation driving module and the counterweight (3);

the excitation driving module comprises a first blade clamp (6), a driving connecting rod and a driving motor, wherein the first blade clamp (6) is arranged at the middle section of the blade (2), and the bottom of the first blade clamp (6) is connected with the driving connecting rod; the driving connecting rod is connected with a driving motor;

the driving connecting rod comprises an active driving module and a follow-up driving module; the driving motor comprises an active driving motor unit (11) and a follow-up driving motor unit (11-1);

The active driving module comprises an active connecting rod (7), an active rocker (9) and an active crank set (10), wherein the active connecting rod (7) is connected with the active rocker (9), and the active rocker (9) is connected with the active crank set (10);

the driving connecting rod (7) is a hollow square tube, one end of the driving connecting rod is provided with a telescopic threaded tube (25), and the other end of the driving connecting rod is provided with a driving connecting rod (19);

the driving rocker (9) is provided with a sliding assembly, the sliding assembly comprises a driving rocker screw (31) and a driving rocker sliding nut (15) matched with the driving rocker screw (31), the driving rocker sliding nut (15) is connected with a driving connecting rod (19), one end of the driving rocker (9) is provided with a driving rocker end arm (14), and the other end of the driving rocker (9) is provided with a driving rocker end cover (17);

the driving crank group (10) consists of two driving crank rods which are arranged correspondingly, namely a first driving crank rod (1011) and a second driving crank rod (1012);

the active driving motor group (11) consists of two active driving motors which are arranged correspondingly, namely a first active driving motor (111) and a second active driving motor (112);

One end of the first driving crank rod (1011) is connected with the driving crank arm (14), and the other end is connected with the first driving motor (111); one end of the second driving crank rod (1012) is connected with the driving crank rod end arm (14), and the other end of the second driving crank rod is connected with the second driving motor (112);

the follow-up driving module comprises a follow-up connecting rod (5), a follow-up rocker (9-1) and a follow-up crank set (10-1); the follow-up connecting rod (5) is connected with the follow-up rocker (9-1), and the follow-up rocker (9-1) is connected with the follow-up crank set (10-1);

the follow-up connecting rod (5) is a hollow square tube, one end of the follow-up connecting rod is provided with a first follow-up connecting rod (19-1), and the other end of the follow-up connecting rod is provided with a second follow-up connecting rod (19-2);

the follow-up rocker (9-1) is provided with a sliding component, the sliding component comprises a follow-up rocker screw rod (31-1) and a follow-up rocker sliding nut (15-1) matched with the follow-up rocker screw rod (31-1), the follow-up rocker sliding nut (15-1) is connected with the first follow-up connecting rod (19-1), one end of the follow-up rocker (9-1) is provided with a follow-up rocker end arm (14-1), and the other end of the follow-up rocker (9-1) is provided with a follow-up rocker end cover (17-1);

The follow-up crank set (10-1) consists of two follow-up crank rods which are arranged correspondingly, namely a first follow-up crank rod (1011-1) and a second follow-up crank rod (1012-1);

the follow-up driving motor unit (11-1) consists of two follow-up driving motors which are arranged correspondingly, namely a first follow-up driving motor (111-1) and a second follow-up driving motor (112-1);

one end of the first follow-up crank rod (1011-1) is connected with a follow-up crank rod end arm (14-1), and the other end is connected with a first follow-up driving motor (111-1); one end of the second follow-up crank rod (1012-1) is connected with the follow-up crank rod end arm (14-1), and the other end of the second follow-up crank rod is connected with the second follow-up driving motor (112-1).

2. A blade multifunctional fatigue testing device according to claim 1, wherein: the telescopic threaded pipe (25) is connected with one end of the driving connecting rod (7) through a guide sleeve (26), one end of the telescopic threaded pipe (25) is connected with the first blade clamp (6), and the other end of the telescopic threaded pipe (25) is connected with the servo motor (28) through a telescopic threaded rod (27); the inside of initiative connecting rod (7) is fixed and is provided with rectangular plate (42), servo motor (28) fixed mounting on rectangular plate (42), the output of servo motor (28) runs through rectangular plate (42) and is connected with the input of telescopic threaded rod (27).

3. A blade multifunctional fatigue testing device according to claim 2, wherein: the driving rocker (9) is of a C-shaped channel steel structure, driving rocker sliding nuts (15) are arranged in a sliding matching mode in the C-shaped channel steel structure, driving rocker lead screws (31) penetrate through the driving rocker end covers (17), the driving rocker lead screws (31) penetrate through the sliding nuts (15), and the sliding nuts (15) can slide in the C-shaped channel steel structure through the driving rocker lead screws (31).

4. A blade multifunctional fatigue testing device according to claim 3, wherein: the first driving crank rod (1011) and the second driving crank rod (1012) are fixedly connected through a first connecting block (32), the first driving crank rod (1011) and the first connecting block (32) are fixed through a plurality of first connecting screws (48), and the second driving crank rod (1012) and the first connecting block (32) are fixed through a plurality of second connecting screws (48-1);

the first driving crank rod (1011) is hinged with the driving rocker end arm (14);

a first clutch (12) is arranged between the first driving crank rod (1011) and the first driving motor (111), and a first speed reducer (4) is arranged between the first clutch (12) and the first driving motor (111);

The first driving crank rod (1011) is connected with the first clutch (12) through a first clutch main shaft (33), and the first speed reducer (4) is connected with the first driving motor (111) through a first coupling (39);

the first clutch main shaft (33) is connected with the first driving crank rod (1011) through a first flange (40), and the first flange (40) and the first driving crank rod (1011) are fixed through a first flange bolt assembly (50);

the second driving crank rod (1012) is hinged with the driving rocker end arm (14);

a second clutch (12-1) is arranged between the second driving crank rod (1012) and the second driving motor (112), and a second speed reducer (4-1) is arranged between the second clutch (12-1) and the second driving motor (112);

the second driving crank rod (1012) is connected with the second clutch (12-1) through a second clutch main shaft (33-1), and the second speed reducer (4-1) is connected with the second driving motor (112) through a second coupler (39-1);

the second clutch main shaft (33-1) is connected with the second driving crank rod (1012) through a second flange (40-1), and the second flange (40-1) and the second driving crank rod (1012) are fixed through a second flange bolt assembly (50-1).

5. The blade multifunctional fatigue testing device according to claim 4, wherein: the follow-up rocker (9-1) is of a C-shaped channel steel structure, the follow-up rocker sliding nuts (15-1) are arranged in a sliding matching mode in the C-shaped channel steel structure, the follow-up rocker end cover (17-1) is penetrated and provided with a follow-up rocker screw (31-1), the follow-up rocker screw (31-1) penetrates through the follow-up rocker sliding nuts (15-1), and the follow-up rocker sliding nuts (15-1) can slide in the C-shaped channel steel structure through the follow-up rocker screw (31-1).

6. The blade multifunctional fatigue testing device according to claim 5, wherein: the first follow-up crank rod (1011-1) is fixedly connected with the second follow-up crank rod (1012-1) through a second connecting block (32-1), the first follow-up crank rod (1011-1) is fixedly connected with the second connecting block (32-1) through a plurality of fourth connecting screws (48-3), and the second follow-up crank rod (1012-1) is fixedly connected with the second connecting block (32-1) through a plurality of third connecting screws (48-2);

the first follow-up crank rod (1011-1) is hinged with a follow-up rocker end arm (14-1);

a fourth clutch (12-3) is arranged between the first follow-up crank rod (1011-1) and the first follow-up driving motor (111-1), and a fourth speed reducer (4-3) is arranged between the fourth clutch (12-3) and the first follow-up driving motor (111-1);

The first follow-up crank rod (1011-1) is connected with the fourth clutch (12-3) through a fourth clutch main shaft (33-3), and the fourth speed reducer (4-3) is connected with the first follow-up driving motor (111-1) through a fourth coupler (39-3);

the fourth clutch main shaft (33-3) is connected with the first follow-up crank rod (1011-1) through a fourth flange (40-3), and the fourth flange (40-3) and the first follow-up crank rod (1011-1) are fixed through a fourth flange bolt assembly (50-3);

the second follow-up crank rod (1012-1) is hinged with the follow-up rocker end arm (14-1);

a third clutch (12-2) is arranged between the second follow-up crank rod (1012-1) and the second follow-up driving motor (112-1), and a third speed reducer (4-2) is arranged between the third clutch (12-2) and the second follow-up driving motor (112-1);

the second follow-up crank rod (1012-1) is connected with the third clutch (12-2) through a third clutch main shaft (33-2), and the third speed reducer (4-2) is connected with the second follow-up driving motor (112-1) through a third coupler (39-2);

the third clutch main shaft (33-2) is connected with the second follow-up crank rod (1012-1) through a third flange (40-2), and the third flange (40-2) and the second follow-up crank rod (1012-1) are fixed through a third flange bolt assembly (50-2).

7. The blade multifunctional fatigue testing device according to claim 6, wherein: the driving connecting rod (7) is formed by splicing three sections of square pipes, a first rectangular connecting ring (20) is fixedly welded on the end face of each section of connected square pipe, each section of connected square pipe is connected through the first rectangular connecting ring (20), and the connected first rectangular connecting rings (20) are fixedly connected through matched first connecting ring nuts (43) and first connecting ring bolts (44);

the two connected first rectangular connecting rings (20) are fixedly connected through eight groups of first connecting ring nuts (43) and first connecting ring bolts (44), and the eight groups of first connecting ring nuts (43) and first connecting ring bolts (44) are uniformly distributed on the first rectangular connecting rings (20);

the follow-up connecting rod (5) is formed by splicing three sections of square pipes, a second rectangular connecting ring (20-1) is fixedly welded on the end face of each section of connected square pipe, each section of connected square pipe is connected through the second rectangular connecting ring (20-1), and the connected second rectangular connecting rings (20-1) are fixedly connected through matched second connecting ring nuts (43-1) and second connecting ring bolts (44-1);

The two connected second rectangular connecting rings (20-1) are fixedly connected through eight groups of second connecting ring nuts (43-1) and second connecting ring bolts (44-1), and the eight groups of second connecting ring nuts (43-1) and second connecting ring bolts (44-1) are uniformly distributed on the second rectangular connecting rings (20-1).

8. The blade multifunctional fatigue testing device according to claim 7, wherein: the bottom of the first blade clamp (6) is provided with a U-shaped plate (23), three groups of round holes are correspondingly formed in two corresponding sides of the U-shaped plate (23), the three groups of round holes are transversely and uniformly arranged on the U-shaped plate (23), and the three groups of round holes are respectively a first round hole group (23-1), a second round hole group (23-2) and a third round hole group (23-3).

9. The blade multifunctional fatigue testing device according to claim 8, wherein: the second round hole group (23-2) is hinged with the telescopic threaded pipe (25), and the second follow-up connecting rod (19-2) is connected with the driving connecting rod (7) through the third lug plate (30-2).