A test device for blade root segment swing and torsion loading

Abstract

The application discloses a test device for flap root section swing and twist load, which comprises a fixed connection between the root end of a test piece to be loaded and a fixed support mechanism, a fixed connection between the process joint end of the test piece and one end of a vibration loading mechanism, horizontal installation of the test piece on a test table through the fixed support mechanism and the vibration loading mechanism, a connection between a centrifugal force executing mechanism and the other end of the vibration loading mechanism through a steel cable, axial consistency between the centrifugal force executing mechanism and the vibration loading mechanism, a vertical fixed connection between a swing and twist executing mechanism and the vibration loading mechanism in a horizontal plane, swing load and twist load combined loading through swing and twist actuators connected to both sides of the swing and twist executing mechanism, and one end of the swing and twist executing mechanism connected to a swing and swing executing mechanism for swing and swing load loading. The technical scheme provided by the application solves the problems of the existing loading mode for the fatigue test of the helicopter main blade, high complexity of the test, and high difficulty of the test operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of helicopter fatigue test, in particular to a test device for flap-pitch-torsion loading of a blade root section. BACKGROUND

[0002] The main blade of a helicopter is an important component of the rotor system of the helicopter, and the fatigue life thereof directly affects the stability of the rotor system of the helicopter.

[0003] At present, the fatigue test loading for the main blade of a helicopter is generally flap-pitch combined loading, and the installation angle of the blade needs to be constantly adjusted in the test to meet the load ratio of the flap and the pitch. The loading mode in the above fatigue test process needs to be implemented together with the adjustment of the installation angle of the blade, and the installation angle of the blade needs to be constantly adjusted, thereby increasing the complexity of the test and the difficulty of the operation. SUMMARY

[0004] The present application relates to the technical field of helicopter fatigue test, in particular to a test device for flap-pitch-torsion loading of a blade root section.

[0005] The technical scheme of the present application is as follows: the present application provides a test device for flap-pitch-torsion loading of a blade root section, comprising: a fixed support mechanism 1, a vibration loading mechanism 2, a flap-torsion execution mechanism 3, a pitch vibration execution mechanism 4, a steel cable 5, and a centrifugal force execution mechanism 6.

[0006] The blade root end of a test piece 7 to be loaded is fixedly connected to the fixed support mechanism 1, and the process joint end of the test piece 7 is fixedly connected to one end of the vibration loading mechanism 2, so that the test piece 7 is horizontally installed on a test bench through the fixed support mechanism 1 and the vibration loading mechanism 2. The centrifugal force execution mechanism 6 is connected to the other end of the vibration loading mechanism 2 through the steel cable 5, and the axial direction of the centrifugal force execution mechanism 6 is consistent with that of the vibration loading mechanism 2.

[0007] The flap-torsion execution mechanism 3 is fixedly connected to the vibration loading mechanism 2 in a vertical direction in a horizontal plane, and flap load and torsion load are jointly loaded through the flap-torsion actuators connected to the two sides of the flap-torsion execution mechanism 3. One end of the flap-torsion execution mechanism 3 is connected to the pitch vibration execution mechanism 4 to load the pitch vibration load.

[0008] Optionally, in the test device for flap-pitch-torsion loading of a blade root section as described above, the blade root end of the test piece 7 is provided with at least two mounting through holes.

[0009] The fixed support mechanism 1 comprises a fixed seat 1a, a flange plate 1b, a tightening bolt 1c and a loading front joint 1d;

[0010] Wherein, the flange plate 1b is sleeved on the mounting end surface of the loading front joint 1d, and the flange plate 1b and the loading front joint 1d are fixed on the fixed seat 1a through the tightening bolt 1c, and the fixed seat 1a is fixedly installed on the test bench with the fixed end surface; the loading front joint 1d is provided in a double-ear structure, and mounting holes matched with the mounting through holes in the test piece 7 are formed on each ear for fixedly connecting the blade root end of the test piece 7 to the double-ear structure through the blade pin and the nut.

[0011] The fixed support mechanism 1 is used to rotate the loading front joint 1d around its axis by 360° by loosening the tightening bolt 1c before the test, so that the test piece 7 is loaded into the loading front joint 1d in the blade oscillation direction, and the test piece 7 is in the horizontal direction before the test loading through rotation.

[0012] Optionally, in the test device for blade root section oscillation and torsion loading as described above, the process joint end of the test piece 7 is provided with upper and lower clamping plates, and at least two mounting holes are formed in the corresponding positions of each clamping plate.

[0013] The excitation loading mechanism 2 comprises a blade pin dummy 2a, a loading rear joint 2b, an excitation head 2c and a parallel sleeve 2d.

[0014] Wherein, the joint end of the loading rear joint 2b is provided in a double-fork ear structure, and mounting holes corresponding to the upper and lower clamping plates are formed on each ear for sleeving the loading rear joint 2b outside the upper and lower clamping plates of the test piece 7, and loading the parallel sleeve 2d between the upper and lower clamping plates, and a plurality of blade pin dummies 2a are correspondingly threaded through the mounting holes of the double-fork ear structure, one sleeve of the parallel sleeve 2d and the mounting holes of the upper and lower clamping plates, and the two ends are fixedly connected through the nuts; the upper and lower clamping plates are abutted and contacted on the inner side of the double-fork ear structure of the loading rear joint 2b through the parallel sleeve 2d from the inner side.

[0015] The other end of the loading rear joint 2b is a threaded rod with external threads, the excitation head 2c is provided in a columnar connecting rod with an axial threaded hole, and the excitation head 2c is threadedly connected with the loading rear joint 2b and locked and fixed through a threaded clamp.

[0016] The excitation head 2c is fixedly connected with the oscillation and torsion execution mechanism 3 in the vertical direction in the horizontal plane, and the oscillation and torsion execution mechanism 3 vertically extends out of both sides of the excitation head 2c in the horizontal plane, and one end of the oscillation and torsion execution mechanism 3 is double-fork connected with the oscillation execution mechanism 4 perpendicular to the excitation head 2c, so as to apply the oscillation load, the torsion load and the oscillation load to the excitation loading mechanism 2 through the connection of the oscillation and torsion execution mechanism 3 and the oscillation execution mechanism 4.

[0017] Optionally, in the test device for blade root segment swing-torsion loading as described above, the swing-torsion actuator 3 comprises a connecting bolt 3a, two connecting double ears 3b, two loading single ears 3c and two swing-torsion actuators.

[0018] The connecting double ears 3b are fixedly connected to the two sides of the excitation head 2c in the vertical direction, and the axial directions of the two connecting double ears 3b are perpendicular to the axial threaded holes in the horizontal direction. Each connecting double ear 3b is hinged to one end of the loading single ear 3c through a connecting bolt 3a and a nut, and the other end of the loading single ear 3c is threadedly connected to the swing-torsion actuator. One connecting double ear 3b is hinged to the swing-vibration actuator 4.

[0019] Optionally, in the test device for blade root segment swing-torsion loading as described above, the swing-torsion actuator 3 comprises a connecting bolt 3a, one connecting double ear 3b, two loading single ears 3c and two swing-torsion actuators.

[0020] The connecting double ear 3b is provided with a connecting threaded hole perpendicular to the axial threaded hole in the horizontal plane, and the two ends of the connecting double ear 3b are respectively provided with double ears, and the middle part is provided with an external thread. One end of the connecting double ear 3b passes through the connecting threaded hole in the excitation head 2c, so that the external thread in the middle part is nested and threadedly connected in the connecting threaded hole of the excitation head 2c; or,

[0021] The excitation head 2c is provided with a limiting through hole perpendicular to the axial threaded hole in the horizontal plane, and the limiting through hole has a limiting plane. The two ends of the connecting double ear 3b are respectively provided with double ears, and the middle part of the rod body matches the limiting through hole. After the one end of the connecting double ear 3b passes through the limiting through hole of the excitation head 2c, the rotation of the connecting double ear 3b in the excitation head 2c is limited by the limiting plane; or,

[0022] The excitation head 2c and the connecting double ear 3b fixedly connected to the two sides thereof are of an integrated structure.

[0023] Optionally, in the test device for blade root segment swing-torsion loading as described above, the swing-vibration actuator 4 comprises a swing-vibration double ear and a swing-vibration actuator.

[0024] The swing-vibration double ear is sleeved outside one end double ear of the swing-torsion actuator 3, and the swing-vibration double ear, one end double ear of the swing-torsion actuator 3 and the loading single ear 3c on the same side thereof are hinged through a connecting bolt 3a. The swing-vibration double ear bottom screw is threadedly connected to the swing-vibration actuator.

[0025] Optionally, in the test device for blade root segment swing-torsion loading as described above, the structure of the swing-vibration actuator 4,

[0026] The two side fork holes connected by the connecting bolt 3a of the swing double fork and the double fork at one end of the connecting double fork 3b are respectively sleeved with a rolling bearing, so as to ensure that the swing double fork can rotate around the axis of the connecting bolt 3a.

[0027] Optionally, in the test device for the flapwise and edgewise torsional loading of the blade root section, one end of the vibration excitation head 2c of the vibration excitation mechanism 2 is connected with the centrifugal force executing mechanism 6 in a double fork structure.

[0028] One end of the steel cable 5 is fixedly connected with the double fork structure of the vibration excitation head 2c through a single fork and a bolt, and the other end is fixedly connected with the centrifugal force actuator of the centrifugal force executing mechanism 6 through a single fork and a bolt.

[0029] Optionally, in the test device for the flapwise and edgewise torsional loading of the blade root section,

[0030] The test device is used for horizontally installing the test piece 7 through the fixed support mechanism 1 before the test, and under the premise that the centrifugal force executing mechanism 6 normally works, the flapwise and torsional loadings are simultaneously applied by the two loading single forks 3c of the flapwise and torsional executing mechanism 3, the relative sizes of the loadings are adjusted by the two flapwise and torsional actuators, so that the loadings meet the test requirements and the preset load ratio, and finally the flapwise loading is adjusted by the flapwise and edgewise executing mechanism 4 to meet the preset requirements.

[0031] The test device for the flapwise and edgewise torsional loading of the blade root section, the blade root end of the test piece 7 to be loaded is fixedly connected with the fixed support mechanism 1, the process joint end of the test piece 7 is fixedly connected with one end of the vibration excitation mechanism 2, so as to horizontally install the test piece 7 on the test table through the fixed support mechanism 1 and the vibration excitation mechanism 2, the centrifugal force executing mechanism 6 is connected with the other end of the vibration excitation mechanism 2 through the steel cable 5, and the axis directions of the centrifugal force executing mechanism 6 and the vibration excitation mechanism 2 are consistent, the flapwise and torsional executing mechanism 3 is fixedly connected with the vibration excitation mechanism 2 in a vertical direction on a horizontal plane, the flapwise and torsional actuators connected with the two sides of the flapwise and torsional executing mechanism 3 are used to implement the combined loading of the flapwise and torsional loadings, and one end of the flapwise and torsional executing mechanism 3 is connected with the flapwise and edgewise executing mechanism 4 to implement the loading of the flapwise loading. By using the test device, the centrifugal force is applied to the test piece 7 by the centrifugal force executing mechanism 6 through the steel cable 5 and the vibration excitation mechanism 2, the flapwise and torsional loadings are applied to the test piece 7 by the vibration excitation mechanism 2 through the flapwise and torsional executing mechanism 3, and the flapwise bending moment is applied to the test piece 7 by the vibration excitation mechanism 2 through the flapwise and edgewise executing mechanism 4. Not only can the coordinated loading of the flapwise, edgewise and torsional loadings of the main blade root section be realized, but also the flapwise and edgewise loadings are innovatively loaded separately, the loadings are directly adjusted from the perspective of measurement and control, and the period required for the loading adjustment is greatly shortened. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used to explain the technical solutions of the present application together with the embodiments of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0033] Figure 1 A schematic diagram of the overall structure of a test device for flapwise and edgewise torsional loading of a blade root section is provided for the embodiments of the present application.

[0034] Figure 2 A schematic diagram of the overall structure of a test device for flapwise and edgewise torsional loading of a blade root section is provided for the embodiments of the present application. Figure 1 A schematic diagram of the overall structure of a test device for flapwise and edgewise torsional loading of a blade root section is provided for the embodiments of the present application.

[0035] Figure 3 A schematic diagram of the overall structure of a test device for flapwise and edgewise torsional loading of a blade root section is provided for the embodiments of the present application. Figure 1 A schematic diagram of the overall structure of a test device for flapwise and edgewise torsional loading of a blade root section is provided for the embodiments of the present application. Specific embodiments

[0036] In order to make the objects, technical solutions and advantages of the present application more clear, the embodiments of the present application will be described in detail below with reference to the drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other at will.

[0037] As described in the above background, the main blade of a helicopter is an important component of a rotor system, and it is important to monitor the fatigue life of the main blade. The existing loading mode for the fatigue test of the main blade of a helicopter has the problems of flapwise and edgewise combined loading, and the installation angle of the blade needs to be adjusted constantly in the test to meet the load ratio of flapwise and edgewise, thereby increasing the complexity of the test and the difficulty of the operation.

[0038] In order to solve the above problems and explore the fatigue characteristics of the main blade root section, the embodiments of the present application provide a test device for flapwise and edgewise torsional loading of a blade root section, which realizes the purpose of solving the lack of a new type of blade root section fatigue test device.

[0039] The following specific embodiments provided by the present application can be combined with each other, and the same or similar concepts or processes can not be described repeatedly in some embodiments.

[0040] Figure 1 A schematic diagram of the overall structure of a test device for flapwise and edgewise torsional loading of a blade root section is provided for the embodiments of the present application. As shown in Figure 1 The components of the test device provided by the embodiments of the present application can include: a fixed support mechanism 1, an excitation loading mechanism 2, a flapwise and torsional execution mechanism 3, an edgewise execution mechanism 4, a steel cable 5 and a centrifugal force execution mechanism 6.

[0041] Figure 1 The test apparatus shown is used to apply pendulum torsion loading to the test specimen 7 to be loaded, such as... Figure 1 As shown, the blade root end of the test piece 7 to be loaded is fixedly connected to the fixed support mechanism 1, and the process joint end of the test piece 7 is fixedly connected to one end of the excitation loading mechanism 2, so that the test piece 7 is horizontally installed on the test table through the fixed support mechanism 1 and the excitation loading mechanism 2. The centrifugal force actuator 6 is connected to the other end of the excitation loading mechanism 2 through the steel cable 5, and the centrifugal force actuator 6 and the excitation loading mechanism 2 are aligned in the same direction.

[0042] like Figure 1 As shown, the swing-torsion actuator 3 of the test device is vertically fixed to the excitation loading mechanism 2 on the horizontal plane, and the swing load and torsional load are applied by the swing-torsion actuators connected on both sides of the swing-torsion actuator 3. One end of the swing-torsion actuator 3 is connected to the oscillation actuator 4 to apply the oscillation load.

[0043] In the test apparatus for blade root section swing-torsional loading provided in the above embodiments of the present invention, centrifugal force is applied to the test specimen 7 by the centrifugal force actuator 6 through the steel cable 5 and the vibration loading mechanism 2; swing load and torque load are loaded by the vibration loading mechanism 2 through the swing-torsional actuator 3; and oscillation bending moment is loaded by the vibration loading mechanism 2 through the oscillation actuator 4. Clearly, the test apparatus provided in the embodiments of the present invention can realize the loading of centrifugal force, swing load, torque load, and oscillation load, and innovatively loads the swing load and oscillation load separately, facilitating direct load adjustment from a measurement and control perspective.

[0044] like Figure 1 The connection position between the test piece 7 and the fixed support mechanism 1 is shown. In this embodiment of the invention, the blade root end of the test piece 7 is provided with at least two mounting through holes. In one implementation of this embodiment of the invention, the fixed support mechanism 1 includes: a fixed seat 1a, a flange 1b, a tightening bolt 1c, and a pre-loading connector 1d; as shown... Figure 2 As shown, Figure 1 The schematic diagram of the fixed support mechanism in the test device for pendulum torsion loading of the blade root section provided in the embodiment shown is shown.

[0045] In this implementation, the structure of the fixed support mechanism 1 uses a flange 1b fitted onto the mounting end face of the loading front connector 1d, and the flange 1b and the loading front connector 1d are fixed together on the fixed seat 1a by tightening the bolts 1c. The fixed seat 1a is fixedly installed on the test bench with its fixed end face. The loading front connector 1d is set as a double-ear structure, and each ear has a mounting hole that matches the position of the mounting through hole in the test piece 7, which is used to fix the blade root end of the test piece 7 to the double-ear structure through the blade pin and nut.

[0046] The function of the fixed support mechanism 1 in this implementation is to allow the pre-loading connector 1d to rotate 360° around its axis by loosening the tightening bolt 1c before the test, so that the test piece 7 can be installed in the pre-loading connector 1d in the direction of blade oscillation. The rotation also ensures that the test piece 7 is horizontal before the test loading. The structural design of the fixed support mechanism 1 in this implementation facilitates the installation and loading of the test piece 7.

[0047] like Figure 1 The connection position between the test piece 7 and the excitation loading mechanism 2 is shown. In this embodiment of the invention, the process joint end of the test piece 7 is provided with upper and lower clamping plates, and each clamping plate has at least two mounting holes at a corresponding position. In one implementation of this embodiment of the invention, the excitation loading mechanism 2 includes: a blade pin dummy 2a, a loading joint 2b, an excitation head 2c, and a parallel sleeve 2d; as shown... Figure 3 As shown, Figure 1 The illustrated embodiment provides a schematic diagram of the excitation loading mechanism and the swing-torsion actuator in the test apparatus for swing-torsion loading of the blade root section.

[0048] In this implementation method, refer to Figure 1 and Figure 3 As shown, the connector end of the loaded connector 2b is configured as a double-fork lug structure, and each lug has a mounting hole corresponding to the upper and lower clamping plates. The loaded connector 2b is fitted onto the outside of the upper and lower clamping plates of the test piece 7, and a parallel sleeve 2d is inserted between the upper and lower clamping plates. Multiple blade pins 2a are used to pass through the mounting holes of the double-fork lug structure, one sleeve of the parallel sleeve 2d, and the mounting holes of the upper and lower clamping plates, respectively. The two ends are fixedly connected by nuts. The upper and lower clamping plates are brought into contact with the inner side of the double-fork lug structure of the loaded connector 2b from the inside through the parallel sleeve 2d.

[0049] In this implementation, the other end of the loaded connector 2b is a screw with external threads, and the excitation head 2c is a cylindrical connecting rod with an axial threaded hole. After the excitation head 2c is threadedly connected to the loaded connector 2b, it is locked and fixed by a threaded clamp. In addition, the excitation head 2c is vertically connected to the swing-torsion actuator 3 in the horizontal plane, and the swing-torsion actuator 3 extends vertically to both sides of the excitation head 2c in the horizontal plane. One end of the swing-torsion actuator 3 is connected to a swinging actuator 4 perpendicular to the excitation head 2c by a double fork lug, so as to apply swing load, torsional load and swing to the excitation loading mechanism 2 by connecting the swing-torsion actuator 3 and the swinging actuator 4.

[0050] In the optional implementations of this invention, such as Figure 3 As shown, the structure of the torsion actuator 3 can adopt the following structural form.

[0051] The torsional actuator 3 can include a connecting bolt 3a, two connecting double yokes 3b, two loading single yokes 3c, and two torsional actuators in the structural form 1.

[0052] In the structural form 1, the two sides of the excitation head 2c are fixedly connected with the connecting double yokes 3b in the vertical direction, and the axial directions of the two connecting double yokes 3b are perpendicular to the axial threaded holes in the horizontal direction; each connecting double yoke 3b is hinged to one end of the loading single yoke 3c through the connecting bolt 3a and the nut, and the other end of the loading single yoke 3c is threadedly connected with the torsional actuator; specifically, one connecting double yoke 3b is hinged to the pendulum actuator 4.

[0053] The torsional actuator 3 can include a connecting bolt 3a, one connecting double yoke 3b, two loading single yokes 3c, and two torsional actuators in the structural form 2.

[0054] In the structural form 2, the excitation head 2c is provided with a connecting threaded hole perpendicular to the axial threaded hole in the horizontal plane, the connecting double yoke 3b is provided with double yokes at both ends and an external thread in the middle, and the connecting double yoke 3b is connected with the excitation head 2c by inserting the double yoke at one end into the connecting threaded hole in the excitation head 2c and nesting the external thread in the middle in the connecting threaded hole in the excitation head 2c.

[0055] The torsional actuator 3 can include a connecting bolt 3a, one connecting double yoke 3b, two loading single yokes 3c, and two torsional actuators in the structural form 3.

[0056] In the structural form 3, the excitation head 2c is provided with a limiting through hole perpendicular to the axial threaded hole in the horizontal plane, and the limiting through hole has a limiting plane, the connecting double yoke 3b is provided with double yokes at both ends and a rod body in the middle which matches the limiting through hole; the connecting double yoke 3b is limited in rotation in the excitation head 2c by the limiting plane after the double yoke at one end passes through the limiting through hole in the excitation head 2c.

[0057] The torsional actuator 3 can include a connecting bolt 3a, one connecting double yoke 3b, two loading single yokes 3c, and two torsional actuators in the structural form 4.

[0058] In the structural form 4, the connecting double yoke 3b fixedly connected with the excitation head 2c is an integral structure, which is similar to the structural form 1.

[0059] In one implementation manner of the embodiment of the present application, as shown in Figure 3 The pendulum actuator 4 includes a pendulum double yoke and a pendulum actuator.

[0060] In the implementation, the swing double yoke is sleeved outside the double yoke at one end of the swing-torsion actuator 3, and is hinged to the double yoke at one end of the swing-torsion actuator 3 and the single yoke 3c at the same side thereof through the connecting bolt 3a; the swing double yoke is in threaded connection with the swing actuator at the bottom.

[0061] In the specific implementation, in the structure of the swing actuator 4, the swing double yoke is sleeved with a rolling bearing in each of the two yoke holes at the two sides of the double yoke at one end of the connecting double yoke 3b through the connecting bolt 3a, so as to ensure that the swing double yoke can rotate around the axis of the connecting bolt 3a.

[0062] In one implementation of the embodiment, the exciting head 2c of the exciting loading mechanism 2 is provided with a double yoke structure at the end connected to the centrifugal force actuator 6.

[0063] In the implementation, one end of the steel cable 5 is fixedly connected to the double yoke structure of the exciting head 2c through a single yoke and a bolt, and the other end is fixedly connected to the centrifugal force actuator of the centrifugal force actuator 6 through a single yoke and a bolt. Correspondingly, the connecting end of the centrifugal force actuator is provided with a double yoke.

[0064] The loading mode of the test device for the paddle root section swing-torsion loading provided by the embodiment is as follows: before the test, the test piece 7 is horizontally installed through the fixed support mechanism 1, under the premise that the centrifugal force actuator 6 is normally working, the loading single yokes 3c at the two sides of the swing-torsion actuator 3 are used to simultaneously apply forces in opposite directions, the relative sizes of the applied forces of the two swing-torsion actuators are adjusted, so that the loads meet the test requirements and the preset load ratio of the swing load and the torsion load; finally, the swing actuator 4 is adjusted to meet the preset requirements of the swing load.

[0065] The test device for the flap root section swing and twist load provided by the embodiment of the application is characterized in that: the root end of the test piece 7 to be loaded is fixedly connected with the fixed support mechanism 1, the process joint end of the test piece 7 is fixedly connected with one end of the exciting load mechanism 2, so that the test piece 7 is horizontally installed on the test table through the fixed support mechanism 1 and the exciting load mechanism 2, the centrifugal force executing mechanism 6 is connected with the other end of the exciting load mechanism 2 through the steel cable 5, and the centrifugal force executing mechanism 6 is axially consistent with the exciting load mechanism 2; the swing and twist executing mechanism 3 is fixedly connected with the exciting load mechanism 2 in the vertical direction on the horizontal plane, and the swing and twist actuator connected on both sides of the swing and twist executing mechanism 3 is used to implement the combined loading of the swing load and the twist load, one end of the swing and twist executing mechanism 3 is connected with the swing and twist executing mechanism 4, so as to implement the loading of the swing and twist load. By using the test device, the centrifugal force is applied to the test piece 7 by the centrifugal force executing mechanism 6 through the steel cable 5 and the exciting load mechanism 2; the swing load and the twist load are loaded by the exciting load mechanism 2 through the swing and twist executing mechanism 3; the swing and twist bending moment is loaded by the exciting load mechanism 2 through the swing and twist executing mechanism 4; not only the coordinated loading of the swing, the swing and the twist of the main blade root section can be realized, but also the swing load and the swing load are innovatively loaded separately, the load is directly debugged from the perspective of measurement and control, and the period required for the load debugging is greatly shortened.

[0066] Although the embodiments disclosed by the application are as above, the content is only the embodiment adopted for the purpose of understanding the application, and is not used to limit the application. Any person skilled in the art of the application can make any modification and change in the implementation form and details without departing from the spirit and scope of the application disclosed, but the patent protection scope of the application should be subject to the range defined by the appended claims.

Claims

1. A test apparatus for paddle root section whipping torsion loading, characterized by, The utility model relates to a horizontal combined loading test device for wind turbine blades, which comprises a fixed support mechanism (1), a vibration loading mechanism (2), a swing-torsion executing mechanism (3), a swing-vibration executing mechanism (4), a steel cable (5) and a centrifugal force executing mechanism (6). The root end of the test piece (7) to be loaded is fixedly connected to the fixed support mechanism (1), and the process joint end of the test piece (7) is fixedly connected to one end of the vibration loading mechanism (2), so that the test piece (7) is horizontally installed on the test bench through the fixed support mechanism (1) and the vibration loading mechanism (2), the centrifugal force executing mechanism (6) is connected to the other end of the vibration loading mechanism (2) through the steel cable (5), and the axial directions of the centrifugal force executing mechanism (6) and the vibration loading mechanism (2) are consistent. The swing-torsion executing mechanism (3) is vertically fixedly connected to the vibration loading mechanism (2) in the horizontal plane, and the swing-torsion executing mechanism (3) is used to implement the combined loading of the swing load and the torsion load through the swing-torsion actuators connected to the two sides of the swing-torsion executing mechanism (3), and one end of the swing-torsion executing mechanism (3) is connected to the swing-vibration executing mechanism (4) to implement the loading of the swing-vibration load. The root end of the test piece (7) is provided with at least two installation through holes. The fixed support mechanism (1) comprises a fixed seat (1a), a flange plate (1b), a tightening bolt (1c) and a loading front joint (1d). The flange plate (1b) is sleeved on the installation end face of the loading front joint (1d), and the flange plate (1b) and the loading front joint (1d) are fixed on the fixed seat (1a) through the tightening bolt (1c), and the fixed seat (1a) is fixedly installed on the test bench through the fixed end face; the loading front joint (1d) is provided in a double-ear structure, and installation holes matched with the positions of the installation through holes in the test piece (7) are formed in each ear, which are used to fixedly connect the root end of the test piece (7) to the double-ear structure through the blade pin and the nut. The fixed support mechanism (1) is used to rotate the loading front joint (1d) around the axis by 360 degrees by loosening the tightening bolt (1c) before the test, so that the test piece (7) is loaded into the loading front joint (1d) in the blade swing direction, and the test piece (7) is in the horizontal direction before the test loading through rotation. The process joint end of the test piece (7) is provided with upper and lower clamping plates, and at least two installation holes are formed in the corresponding positions of each clamping plate. The vibration loading mechanism (2) comprises a blade pin dummy (2a), a loading rear joint (2b), a vibration head (2c) and a parallel sleeve (2d). The joint end of the loading rear joint (2b) is provided in a double-fork ear structure, and installation holes corresponding to the upper and lower clamping plates are formed in each ear, which are used to sleeve the loading rear joint (2b) outside the upper and lower clamping plates of the test piece (7), and the parallel sleeve (2d) is loaded between the upper and lower clamping plates, a plurality of blade pin dummies (2a) are used to pass through the installation holes of the double-fork ear structure, one sleeve of the parallel sleeve (2d) and the installation holes of the upper and lower clamping plates, and the two ends are fixedly connected through the nuts; the upper and lower clamping plates are abutted and contacted on the inner side of the double-fork ear structure of the loading rear joint (2b) through the parallel sleeve (2d) from the inner side. ​ The other end of the loading rear joint (2b) is a screw rod with external threads, and the excitation head (2c) is a columnar connecting rod with an axial threaded hole; after the excitation head (2c) is threadedly connected with the loading rear joint (2b), the excitation head (2c) is locked and fixed by a threaded clamp; The excitation head (2c) is fixedly connected with a swing-torsion actuating mechanism (3) in a vertical direction in a horizontal plane, and the swing-torsion actuating mechanism (3) extends vertically on both sides of the excitation head (2c) in the horizontal plane; one end of the swing-torsion actuating mechanism (3) is connected with a swing-shake actuating mechanism (4) which is perpendicular to the excitation head (2c), so as to apply swing load, torsion load and swing-shake load to the excitation loading mechanism (2) through the swing-torsion actuating mechanism (3) and the swing-shake actuating mechanism (4).

2. The test apparatus for paddle root section whipping torsion loading according to claim 1, wherein, The swing-torsion actuating mechanism (3) comprises a connecting bolt (3a), two connecting double ears (3b), two loading single ears (3c) and two swing-torsion actuators. The two sides of the excitation head (2c) are fixedly connected with the connecting double ears (3b) in a vertical direction, respectively, and the axial directions of the two sides of the connecting double ears (3b) are perpendicular to the axial threaded hole in the horizontal direction; each side of the connecting double ears (3b) is hinged to one end of the loading single ear (3c) through the connecting bolt (3a) and a nut, and the other end of the loading single ear (3c) is threadedly connected with the swing-torsion actuator; one side of the connecting double ears (3b) is hinged to the swing-shake actuating mechanism (4).

3. The test apparatus for paddle root section whipping torsion loading according to claim 1, wherein, The swing-torsion actuating mechanism (3) comprises a connecting bolt (3a), one connecting double ear (3b), two loading single ears (3c) and two swing-torsion actuators. The excitation head (2c) is provided with a connecting threaded hole which is perpendicular to the axial threaded hole in the horizontal plane, both ends of the connecting double ear (3b) are provided with double ears, and the middle part is provided with external threads; one end of the connecting double ear (3b) passes through the connecting threaded hole in the excitation head (2c), so that the middle part of the connecting double ear (3b) is nested and threadedly connected in the connecting threaded hole in the excitation head (2c); or, The excitation head (2c) is provided with a limiting through hole which is perpendicular to the axial threaded hole in the horizontal plane, and the limiting through hole has a limiting plane; both ends of the connecting double ear (3b) are provided with double ears, and the middle part of the rod body is matched with the limiting through hole; after one end of the connecting double ear (3b) passes through the limiting through hole in the excitation head (2c), the rotation of the connecting double ear (3b) in the excitation head (2c) is limited by the limiting plane; or, The excitation head (2c) and the connecting double ear (3b) fixedly connected with the two sides of the excitation head (2c) are an integral structure.

4. A test apparatus for paddle root section whipping torsion loading according to claim 2 or 3, characterised in that, The swing-shake actuating mechanism (4) comprises a swing-shake double ear and a swing-shake actuator. The swing-shake double ear is sleeved outside one end of the swing-torsion actuating mechanism (3), and the swing-shake double ear, one end of the swing-torsion actuating mechanism (3) and the loading single ear (3c) on the same side are hinged through the connecting bolt (3a); the swing-shake double ear bottom screw rod is threadedly connected with the swing-shake actuator.

5. The test apparatus for paddle root section whipping torsion loading according to claim 4, wherein, The structure of the swing-shake actuating mechanism (4) The two side fork holes of the swing-vibration double fork connected with one end of the double fork of the connecting double fork (3b) are respectively sleeved with a rolling bearing through the connecting bolt (3a), so as to ensure that the swing-vibration double fork can rotate around the axis of the connecting bolt (3a).

6. The test apparatus for paddle root section whipping torsion loading of claim 2, wherein, One end of the excitation head (2c) of the excitation loading mechanism (2) is connected with the centrifugal force executing mechanism (6) and is provided with a double fork structure. One end of the steel cable (5) is fixedly connected with the double fork structure of the excitation head (2c) through a single fork and a bolt, and the other end is fixedly connected with the centrifugal force actuator of the centrifugal force executing mechanism (6) through a single fork and a bolt.

7. The test device for the swing-torsion loading of the blade root section according to any one of claims 1-3, characterized in that, The test device is used for horizontally installing the test piece (7) through the fixed support mechanism (1) before the test, and under the premise that the centrifugal force executing mechanism (6) normally works, the opposite directions of the forces are simultaneously applied through the loading single forks on the two sides of the swing-torsion executing mechanism (3), the relative sizes of the loading forces are adjusted through the two swing-torsion actuators, so that the loads meet the test requirements and the preset load ratio; finally, the swing-torsion executing mechanism (4) is adjusted to make the swing-torsion load meet the preset requirements.

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