Testing device for blade root section swing torsion loading

Abstract

The invention discloses a test device for swing and torsion loading of a blade root section, which is characterized in that the blade root end of a test piece to be loaded is fixedly connected with a fixed support mechanism, and the process joint end of the test piece is fixedly connected with one end of an excitation loading mechanism, so that the test piece is horizontally mounted on a test bed through the fixed support mechanism and the excitation loading mechanism; the centrifugal force executing mechanism is connected with the other end of the excitation loading mechanism through a steel cable, and the axial directions of the centrifugal force executing mechanism and the excitation loading mechanism are consistent; the swing executing mechanism is fixedly connected with the excitation loading mechanism in the vertical direction on the horizontal plane, swing actuators connected with the two sides of the swing executing mechanism are used for loading a swing load and a torsion load in a combined mode, and one end of the swing executing mechanism is connected with the shimmy executing mechanism so as to load a shimmy load. According to the technical scheme provided by the invention, the problems of relatively high test complexity and relatively high test operation difficulty of an existing loading mode for the fatigue test of the helicopter main blade are solved.

Description

Technical Field

[0001] The invention relates to the field of helicopter fatigue test technology, but is not limited thereto, and in particular to a test device for swing torsion loading of a blade root section. Background Art

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

[0003] At present, fatigue test loading for helicopter main rotor blades is usually: combined loading of flapping and shimmying. During the test, the installation angle of the blade needs to be continuously adjusted to meet the load ratio of flapping and shimmying. The loading method in the above fatigue test process needs to be implemented together with the adjustment of the blade installation angle. The blade installation angle needs to be continuously adjusted, which increases the complexity of the test and the difficulty of operation. Summary of the invention

[0004] Purpose of the present invention: In order to solve the above-mentioned problem, an embodiment of the present invention provides a test device for flapping and torsional loading of the root section of the blade, so as to solve the existing loading method for fatigue testing of the main rotor blade of a helicopter. Due to the combined loading of flapping and oscillation, and the need to continuously adjust the installation angle of the blade during the test to meet the load ratio of flapping and oscillation, the complexity of the test and the difficulty of operation are increased.

[0005] The technical solution of the present invention: The embodiment of the present invention provides a test device for the swing and torsion loading of the root section of a blade, comprising: a fixing mechanism 1, an exciting loading mechanism 2, a swing and torsion actuator 3, a swing actuator 4, a steel cable 5 and a centrifugal force actuator 6;

[0006] The blade root end of the test piece 7 to be loaded is fixedly connected to the fixing 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 mounted on the test bench through the fixing mechanism 1 and the excitation loading mechanism 2, and the centrifugal force actuator 6 is connected to the other end of the excitation loading mechanism 2 through the steel cable 5, and the axial direction of the centrifugal force actuator 6 is consistent with that of the excitation loading mechanism 2;

[0007] The swing-torsion actuator 3 is vertically fixedly connected to the excitation loading mechanism 2 on a horizontal plane, and the swing load and torsional load are combinedly loaded through 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 swing actuator 4 to implement the loading of the swing load.

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

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

[0010] The flange 1b is sleeved on the mounting end face of the front-loading joint 1d, and the flange 1b and the front-loading joint 1d are fixed together on the fixing seat 1a by tightening the bolts 1c, and the fixing seat 1a is fixedly mounted on the test bench with its fixed end face; the front-loading joint 1d is set as a double-ear structure, and each ear is provided with a mounting hole matching the position of the mounting through hole in the test piece 7, which is used to fix the root end of the test piece 7 with the double-ear structure through a blade pin and a nut;

[0011] The fixing mechanism 1 is used to rotate the pre-loading joint 1d 360° around its axis by loosening and tightening the bolts 1c before the test, so that the test piece 7 is installed into the pre-loading joint 1d in the swing direction of the blade, and through the rotation, the test piece 7 is in a horizontal direction before the test loading.

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

[0013] The excitation loading mechanism 2 comprises: a blade pin dummy 2a, a loaded post joint 2b, an excitation head 2c and a parallel sleeve 2d;

[0014] The joint end of the loaded joint 2b is set as a double-fork ear structure, and each ear piece is provided with a mounting hole corresponding to the upper and lower clamping plates, so that the loaded joint 2b is sleeved on the outer sides of the upper and lower clamping plates of the test piece 7, and the parallel sleeve 2d is installed between the upper and lower clamping plates, and multiple blade pin dummy parts 2a are passed through the mounting holes of the double-fork ear structure, a sleeve of the parallel sleeve 2d, and the mounting holes of the upper and lower clamping plates in a one-to-one correspondence, and the two ends are fixedly connected by nuts; the upper and lower clamping plates are pressed against the inner side of the double-fork ear structure of the loaded joint 2b from the inside through the parallel sleeve 2d;

[0015] The other end of the post-loading joint 2b is a screw with external threads, and the excitation head 2c is configured as a columnar connecting rod with an axial threaded hole. After the excitation head 2c is threadedly connected to the post-loading joint 2b, it is locked and fixed by a threaded clamp;

[0016] The exciting head 2c is fixedly connected with a swing-torsion actuator 3 in a vertical direction on a horizontal plane, and the swing-torsion actuator 3 extends vertically out of both sides of the exciting head 2c on the horizontal plane. A double fork ear at one end of the swing-torsion actuator 3 is connected with a swing actuator 4 perpendicular to the exciting head 2c, so as to apply a swing load, a torsional load and a swing load to the exciting loading mechanism 2 by connecting the swing-torsion actuator 3 and the swing actuator 4.

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

[0018] Among them, the two sides of the exciting head 2c are respectively fixedly connected with connecting double fork ears 3b in the vertical direction, and the axial and axial threaded holes of the connecting double fork ears 3b on both sides are vertically arranged in the horizontal direction; the connecting double fork ears 3b on each side are hinged to one end of the loading single fork ear 3c through the connecting bolts 3a and nuts, and the other end of the loading single fork ear 3c is threadedly connected to the swing and torsion actuator; one side of the connecting double fork ears 3b is hinged to the swing actuator 4.

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

[0020] The excitation head 2c is provided with a connecting threaded hole perpendicular to the axial threaded hole on a horizontal plane, and the two ends of the connecting double fork ears 3b are respectively provided with double fork ears, and the middle part is provided with an external thread, and the connecting double fork ears 3b pass through the connecting threaded hole in the excitation head 2c with the double fork ears at one end thereof, so that the external thread in the middle part thereof 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 on a horizontal plane, and the limiting through hole has a limiting plane, and the two ends of the connecting double fork ear 3b are respectively provided with double fork ears, and the middle rod body matches the limiting through hole; after the connecting double fork ear 3b passes through the limiting through hole of the excitation head 2c with one end of the double fork ear, the rotation of the connecting double fork ear 3b in the excitation head 2c is limited by the limiting plane; or,

[0022] The exciting head 2c and the connecting double-fork ears 3b fixedly connected to the two sides thereof are an integrated structure.

[0023] Optionally, in the test device for blade root section flapping torsion loading as described above, the flapping actuator 4 comprises: a flapping double fork ear and a flapping actuator;

[0024] Among them, the swing double fork ear is mounted on the outside of the double fork ear at one end of the swing and twist actuator 3, and the swing double fork ear, the double fork ear at one end of the swing and twist actuator 3 and the loaded single fork ear 3c on the same side are hinged by connecting bolts 3a; the screw at the bottom of the swing double fork ear is threadedly connected to the swing actuator.

[0025] Optionally, in the above-mentioned test device for blade root section swing torsion loading, the structure of the swing actuator 4 is:

[0026] The fork ear holes on both sides of the swing double fork ear connected to the double fork ear at one end of the connecting double fork ear 3b through the connecting bolt 3a are respectively equipped with a rolling bearing to ensure that the swing double fork ear can rotate around the axial direction of the connecting bolt 3a.

[0027] Optionally, in the test device for blade root section flapping torsion loading as described above, one end of the excitation head 2c in the excitation loading mechanism 2 connected to the centrifugal force actuator 6 is configured as a double fork ear structure;

[0028] One end of the steel cable 5 is fixedly connected to the double-fork ear structure of the exciting head 2c through a single fork ear and a bolt, and the other end is fixedly connected to the centrifugal actuator of the centrifugal force actuator 6 through a single fork ear and a bolt.

[0029] Optionally, in the test device for blade root section flapping torsional loading as described above,

[0030] The test device is used to horizontally install the test piece 7 through the fixing mechanism 1 before the test. Under the premise that the centrifugal force actuator 6 works normally, the two loading single fork ears 3c of the swing-torsion actuator 3 simultaneously apply forces in opposite directions, and the relative sizes of the loading forces implemented by the two swing-torsion actuators are adjusted so that the load meets the swing load and the torsional load to reach the test required load and the preset load ratio; finally, the swing load is adjusted by adjusting the swing actuator 4 so that the swing load meets the preset requirements.

[0031] Beneficial effects of the present invention: An embodiment of the present invention provides a test device for swing and torsion loading of the root section of a blade, wherein the root end of a test piece 7 to be loaded is fixedly connected to a fixing mechanism 1, and the process joint end of the test piece 7 is fixedly connected to one end of an excitation loading mechanism 2, so that the test piece 7 is horizontally mounted on a test bench through the fixing mechanism 1 and the excitation loading mechanism 2, a centrifugal force actuator 6 is connected to the other end of the excitation loading mechanism 2 through a steel cable 5, and the centrifugal force actuator 6 is axially consistent with the excitation loading mechanism 2; the swing and torsion actuator 3 is vertically fixedly connected to the excitation loading mechanism 2 on a horizontal plane, and a combined loading of a swing load and a torsion load is implemented through the swing and torsion actuators connected to both sides of the swing and torsion actuator 3, and one end of the swing and torsion actuator 3 is connected to a swing actuator 4 to implement the loading of a swing load. By adopting this test device, centrifugal force is applied to the test piece 7 by the centrifugal force actuator 6 through the steel cable 5 and the excitation loading mechanism 2; the flapping load and torque load are loaded by the excitation loading mechanism 2 through the flapping and torsion actuator 3; the swing bending moment is loaded by the excitation loading mechanism 2 through the swing actuator 4; not only can the coordinated loading of the three loads of flapping, swinging and torque at the root section of the main blade be achieved, but the flapping load and the swing load are also loaded separately in an innovative way, and the load is directly debugged from the perspective of measurement and control, which greatly shortens the cycle required for load debugging. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0033] Figure 1 A schematic diagram of the overall structure of a test device for blade root section flapping torsional loading provided by an embodiment of the present invention;

[0034] Figure 2 for Figure 1 A schematic diagram of the structure of a fixing mechanism in a test device for blade root section flapping torsional loading provided by the illustrated embodiment;

[0035] Figure 3 for Figure 1 The illustrated embodiment provides a schematic structural diagram of a vibration loading mechanism and a swing-torsion actuator in a test device for blade root section swing-torsion loading. Specific implementation plan

[0036] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0037] The above background technology has explained the importance of fatigue life monitoring for helicopter main rotor blades as an important part of the rotor system. The existing loading method for fatigue testing of helicopter main rotor blades increases the complexity of the test and the difficulty of operation due to the combined loading of flapping and shimmying, and the need to continuously adjust the installation angle of the blades during the test to meet the load ratio of flapping and shimmying.

[0038] In order to solve the above problems and explore the fatigue characteristics of the root section of the main blade, an embodiment of the present invention provides a test device for swing torsional loading of the root section of the blade, which achieves the purpose of solving the lack of new blade root section fatigue test devices.

[0039] The present invention provides the following specific embodiments which can be combined with each other. The same or similar concepts or processes may not be described in detail in some embodiments.

[0040] Figure 1 The overall structure diagram of a test device for blade root section swing torsional loading provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the components of the test device provided by the embodiment of the present invention may include: a fixing mechanism 1, an excitation loading mechanism 2, a swinging and twisting actuator 3, a swinging actuator 4, a steel cable 5 and a centrifugal force actuator 6.

[0041] Figure 1 The test device shown is used to perform swing torsion loading on the test piece 7 to be loaded. Figure 1 As shown, the blade root end of the test piece 7 to be loaded is fixedly connected to the fixing 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 bench through the fixing mechanism 1 and the excitation loading mechanism 2, and the centrifugal force actuator 6 is connected to the other end of the excitation loading mechanism 2 through the steel cable 5, and the axial direction of the centrifugal force actuator 6 is consistent with that of the excitation loading mechanism 2.

[0042] like Figure 1 As shown, the swing-torsion actuator 3 of the test device is vertically fixedly connected to the excitation loading mechanism 2 on the horizontal plane, and the swing load and the torsional load are combined through 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 swing actuator 4 to implement the loading of the swing load.

[0043] In the test device for blade root section swing torsion loading provided by the above embodiment of the present invention, centrifugal force is applied to the test piece 7 by the centrifugal force actuator 6 through the steel cable 5 and the excitation loading mechanism 2; the swing load and torque load are loaded by the excitation loading mechanism 2 through the swing torsion actuator 3; the swing bending moment is loaded by the excitation loading mechanism 2 through the swing actuator 4. Obviously, the set of test devices provided by the embodiment of the present invention can realize the loading of centrifugal force, swing load, torque load and swing load, and innovatively loads the swing load and the swing load separately, which is convenient for directly debugging the load from the perspective of measurement and control.

[0044] like Figure 1 The connection position of the test piece 7 and the fixing mechanism 1 is shown. In the embodiment of the present invention, the root end of the test piece 7 is provided with at least two mounting through holes. In one implementation of the embodiment of the present invention, the fixing mechanism 1 includes: a fixing seat 1a, a flange 1b, a tightening bolt 1c and a pre-loading joint 1d; Figure 2 As shown, Figure 1 The illustrated embodiment provides a schematic structural diagram of a fixing mechanism in a test device for flapping and torsional loading of a blade root section.

[0045] In this implementation, in the structure of the fixing mechanism 1, a flange 1b is mounted on the mounting end surface of the front-loading joint 1d, and the flange 1b and the front-loading joint 1d are fixed together on the fixing seat 1a by tightening the bolts 1c, and the fixing seat 1a is fixedly mounted on the test bench with its fixed end surface; wherein the front-loading joint 1d is configured as a double-ear structure, and each ear is provided with a mounting hole that matches the position of the mounting through hole in the test piece 7, and is used to fix the root end of the test piece 7 to the double-ear structure through a blade pin and a nut.

[0046] The function of the fixing mechanism 1 in this implementation is: before the test, by loosening and tightening the bolts 1c, the pre-loading joint 1d is rotated 360° around its axis, so that the test piece 7 is loaded into the pre-loading joint 1d in the blade swing direction, and by rotating, the test piece 7 is in a horizontal direction before the test loading. The structural setting of the fixing 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. The process joint end of the test piece 7 in the embodiment of the present invention is provided with an upper and a lower clamping plate, and at least two mounting holes are opened at the corresponding position of each clamping plate. In one implementation of the embodiment of the present invention, the excitation loading mechanism 2 includes: a blade pin dummy 2a, a loaded joint 2b, an excitation head 2c and a parallel sleeve 2d; Figure 3 As shown, Figure 1 The illustrated embodiment provides a schematic structural diagram of a vibration loading mechanism and a swing-torsion actuator in a test device for blade root section swing-torsion loading.

[0048] In this implementation, reference Figure 1 and Figure 3 As shown, the joint end of the loaded joint 2b is set as a double-fork ear structure, and each ear is provided with a mounting hole corresponding to the upper and lower clamping plates, so that the loaded joint 2b is sleeved on the outer sides of the upper and lower clamping plates of the test piece 7, and the parallel sleeve 2d is installed between the upper and lower clamping plates, and a plurality of blade pin dummy parts 2a are used to pass through the mounting holes of the double-fork ear structure, a sleeve of the parallel sleeve 2d and the mounting holes of the upper and lower clamping plates in a one-to-one manner, and the two ends are fixedly connected by nuts; the upper and lower clamping plates are pressed against the inner side of the double-fork ear structure of the loaded joint 2b through the parallel sleeve 2d from the inside.

[0049] In this implementation, the other end of the loaded post-joint 2b is a screw with an external thread, and the excitation head 2c is set as a columnar connecting rod with an axial threaded hole. After the excitation head 2c is threadedly connected to the loaded post-joint 2b, it is locked and fixed by a threaded clamp. In addition, the excitation head 2c is fixedly connected to a swing-torsion actuator 3 in a vertical direction on a horizontal plane, and the swing-torsion actuator 3 is vertically extended from both sides of the excitation head 2c on a horizontal plane. One end of the swing-torsion actuator 3 is connected to a swing actuator 4 perpendicular to the excitation head 2c by a double fork ear, so as to apply a swing load, a torsional load and a swing to the excitation loading mechanism 2 by connecting the swing-torsion actuator 3 and the swing actuator 4.

[0050] In an optional implementation of the embodiment of the present invention, Figure 3 As shown, the structure of the swing and twist actuator 3 can adopt the following structural form.

[0051] Structural form 1, the swing and twist actuator 3 may include: a connecting bolt 3a, two connecting double-fork ears 3b, two loading single-fork ears 3c and two swing and twist actuators.

[0052] In this structural form 1, the two sides of the exciting head 2c are vertically fixedly connected with connecting double fork ears 3b, and the axial and axial threaded holes of the connecting double fork ears 3b on both sides are vertically arranged in the horizontal direction; the connecting double fork ears 3b on each side are hinged to one end of the loading single fork ear 3c through the connecting bolts 3a and nuts, and the other end of the loading single fork ear 3c is threadedly connected to the swing and torsion actuator; specifically, one side of the connecting double fork ears 3b is hinged to the swing actuator 4.

[0053] Structural form 2, the swing-twist actuator 3 may include: a connecting bolt 3a, a connecting double-fork ear 3b, two loading single-fork ears 3c and two swing-twist actuators.

[0054] In this structural form 2, the exciting head 2c is provided with a connecting threaded hole perpendicular to the axial threaded hole on the horizontal plane, and the two ends of the connecting double fork ear 3b are respectively provided with double fork ears, and the middle part is provided with an external thread. The connecting double fork ear 3b passes through the connecting threaded hole in the exciting head 2c with the double fork ear at one end, so that the middle part of the external thread is nested and threadedly connected in the connecting threaded hole of the exciting head 2c.

[0055] Structural form 3, the swing and twist actuator 3 may also include: a connecting bolt 3a, a connecting double fork ear 3b, two loading single fork ears 3c and two swing and twist actuators.

[0056] In this structural form 3, the exciting head 2c is provided with a limiting through hole perpendicular to the axial threaded hole on the horizontal plane, and the limiting through hole has a limiting plane, and double fork ears are respectively provided at both ends of the connecting double fork ear 3b, and the middle rod body matches the limiting through hole; after the connecting double fork ear 3b passes through the limiting through hole of the exciting head 2c with one end of the double fork ear, the rotation of the connecting double fork ear 3b in the exciting head 2c is limited by the limiting plane.

[0057] Structural form 4, the swing and twist actuator 3 may also include: a connecting bolt 3a, a connecting double fork ear 3b, two loading single fork ears 3c and two swing and twist actuators.

[0058] This structural form 4 is similar to the above structural form 1, except that the exciting head 2c and the connecting double-forked ears 3b fixedly connected to the two sides thereof are an integrated structure.

[0059] In one implementation of the embodiment of the present invention, Figure 3 As shown, the oscillation actuator 4 includes: oscillation double fork ears and a oscillation actuator.

[0060] In this implementation, the swing double fork ear is mounted on the outside of the double fork ear at one end of the swing and twist actuator 3, and the swing double fork ear, the double fork ear at one end of the swing and twist actuator 3 and the loaded single fork ear 3c on the same side are hinged by connecting bolts 3a; the bottom screw of the swing double fork ear is threadedly connected to the swing actuator.

[0061] In a specific implementation, in the structure of the swing actuator 4, a rolling bearing is respectively installed in the fork ear holes on both sides of the swing double fork ear and the double fork ear at one end of the connecting double fork ear 3b connected by a connecting bolt 3a, so as to ensure that the swing double fork ear can rotate around the axial direction of the connecting bolt 3a.

[0062] In an implementation of the embodiment of the present invention, one end of the vibration head 2c in the vibration loading mechanism 2 connected to the centrifugal force actuator 6 is configured as a double-fork ear structure.

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

[0064] The loading method of the test device for blade root section swing and torsion loading provided by the embodiment of the present invention is as follows: before the test, the test piece 7 is horizontally mounted by the fixing mechanism 1, and under the premise that the centrifugal force actuator 6 works normally, the loading single fork ears 3c on both sides of the swing and torsion actuator 3 simultaneously apply forces in opposite directions, and the relative sizes of the loading forces implemented by the two swing and torsion actuators are adjusted so that the load meets the swing load and the torsion load to reach the test required load and the preset load ratio; finally, the swing load is adjusted by adjusting the swing actuator 4 to meet the preset requirements.

[0065] The test device for swing and torsion loading of the root section of a blade provided in an embodiment of the present invention comprises: a root end of a test piece 7 to be loaded is fixedly connected to a fixing mechanism 1, a process joint end of the test piece 7 is fixedly connected to one end of an excitation loading mechanism 2, so that the test piece 7 is horizontally mounted on a test bench through the fixing mechanism 1 and the excitation loading mechanism 2, a centrifugal force actuator 6 is connected to the other end of the excitation loading mechanism 2 through a steel cable 5, and the axial direction of the centrifugal force actuator 6 is consistent with that of the excitation loading mechanism 2; the swing and torsion actuator 3 is vertically fixedly connected to the excitation loading mechanism 2 on a horizontal plane, and a combined loading of a swing load and a torsion load is implemented through the swing and torsion actuators connected to both sides of the swing and torsion actuator 3, and one end of the swing and torsion actuator 3 is connected to a swing actuator 4 to implement the loading of a swing load. By adopting this test device, centrifugal force is applied to the test piece 7 by the centrifugal force actuator 6 through the steel cable 5 and the excitation loading mechanism 2; the flapping load and torque load are loaded by the excitation loading mechanism 2 through the flapping and torsion actuator 3; the swing bending moment is loaded by the excitation loading mechanism 2 through the swing actuator 4; not only can the coordinated loading of the three loads of flapping, swinging and torque at the root section of the main blade be achieved, but the flapping load and the swing load are also loaded separately in an innovative way, and the load is directly debugged from the perspective of measurement and control, which greatly shortens the cycle required for load debugging.

[0066] Although the embodiments disclosed in the present invention are as above, the contents are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A test device for blade root section flapping torsional loading, characterized in that: include: A fixed support mechanism (1), an exciting loading mechanism (2), a swinging and twisting actuator (3), a swinging and vibrating actuator (4), a steel cable (5) and a centrifugal force actuator (6); The blade root end of the test piece (7) to be loaded is fixedly connected to the fixing 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 mounted on the test bench through the fixing mechanism (1) and the excitation loading mechanism (2), and the centrifugal force actuator (6) is connected to the other end of the excitation loading mechanism (2) through the steel cable (5), and the axial directions of the centrifugal force actuator (6) and the excitation loading mechanism (2) are consistent; The swing-twist actuator (3) is vertically fixedly connected to the excitation loading mechanism (2) on a horizontal plane, and the swing load and the torsion load are combined for loading through the swing-twist actuators connected to both sides of the swing-twist actuator (3). One end of the swing-twist actuator (3) is connected to the swing actuator (4) to load the swing load.

2. The testing device for blade root section flapping torsion loading according to claim 1 is characterized in that: The blade root end of the test piece (7) is provided with at least two mounting through holes; The fixing support mechanism (1) comprises: a fixing seat (1a), a flange (1b), tightening bolts (1c) and a front loading joint (1d); The flange (1b) is sleeved on the mounting end face of the front-loading joint (1d), and the flange (1b) and the front-loading joint (1d) are fixed together on the fixing seat (1a) by tightening the bolts (1c), and the fixing seat (1a) is fixedly mounted on the test bench with its fixed end face; the front-loading joint (1d) is configured as a double-ear structure, and each ear is provided with a mounting hole matching the position of the mounting through hole in the test piece (7), and is used to fix the blade root end of the test piece (7) to the double-ear structure through a blade pin and a nut; The fixing mechanism (1) is used to loosen and tighten the bolts (1c) before the test, so that the pre-loading joint (1d) rotates 360 degrees around its axis, so that the test piece (7) is installed in the pre-loading joint (1d) in the blade swing direction, and through the rotation, the test piece (7) is in a horizontal direction before the test loading.

3. The testing device for blade root section flapping torsion loading according to claim 2 is characterized in that: The process joint end of the test piece (7) is provided with an upper clamping plate and a lower clamping plate, and at least two mounting holes are opened at corresponding positions of each clamping plate; The excitation loading mechanism (2) comprises: a blade pin dummy (2a), a loaded post joint (2b), an excitation head (2c) and a parallel sleeve (2d); The joint end of the loaded joint (2b) is configured as a double-fork ear structure, and each ear piece is provided with a mounting hole corresponding to the upper and lower clamping plates, so that the loaded joint (2b) is sleeved on the outer sides of the upper and lower clamping plates of the test piece (7), and a parallel sleeve (2d) is installed between the upper and lower clamping plates, and a plurality of blade pin dummy parts (2a) are passed through the mounting holes of the double-fork ear structure, a sleeve of the parallel sleeve (2d), and the mounting holes of the upper and lower clamping plates in a one-to-one correspondence, and the two ends are fixedly connected by nuts; the upper and lower clamping plates are pressed against the inner side of the double-fork ear structure of the loaded joint (2b) from the inside through the parallel sleeve (2d); The other end of the post-loading joint (2b) is a screw with external threads, and the exciting head (2c) is configured as a columnar connecting rod with an axial threaded hole. After the exciting head (2c) is threadedly connected to the post-loading joint (2b), it is locked and fixed by a threaded clamp; The excitation head (2c) is fixedly connected to a swing and twist actuator (3) in a vertical direction on a horizontal plane, and the swing and twist actuator (3) extends vertically out of both sides of the excitation head (2c) on the horizontal plane; a double fork ear at one end of the swing and twist actuator (3) is connected to a swing actuator (4) vertical to the excitation head (2c), so that a swing load, a torsional load and a swing load are applied to the excitation loading mechanism (2) by connecting the swing and twist actuator (3) and the swing actuator (4).

4. The testing device for blade root section flapping torsion loading according to claim 3 is characterized in that: The swing-twist actuator (3) comprises: a connecting bolt (3a), two connecting double-fork ears (3b), two loading single-fork ears (3c) and two swing-twist actuators; Wherein, the two sides of the excitation head (2c) are respectively fixedly connected with connecting double fork ears (3b) in a vertical direction, and the axial and axial threaded holes of the connecting double fork ears (3b) on both sides are arranged vertically in the horizontal direction; the connecting double fork ears (3b) on each side are hinged to one end of the loading single fork ear (3c) through a connecting bolt (3a) and a nut, and the other end of the loading single fork ear (3c) is threadedly connected to the swing and twist actuator; and one side of the connecting double fork ears (3b) is hinged to the swing actuator (4).

5. The testing device for blade root section flapping torsion loading according to claim 3 is characterized in that: The swing and twist actuator (3) comprises: a connecting bolt (3a), a connecting double fork ear (3b), two loading single fork ears (3c) and two swing and twist actuators; The excitation head (2c) is provided with a connecting threaded hole perpendicular to the axial threaded hole on a horizontal plane, and the two ends of the connecting double fork ear (3b) are respectively provided with double fork ears, and an external thread is provided in the middle, and the connecting double fork ear (3b) passes through the connecting threaded hole in the excitation head (2c) with the double fork ear at one end thereof, so that the external thread in the middle thereof is nested and threadedly connected in the connecting threaded hole of the excitation head (2c); or, The exciting head (2c) is provided with a limiting through hole on a horizontal plane which is perpendicular to the axial threaded hole, and the limiting through hole has a limiting plane, and the two ends of the connecting double fork ear (3b) are respectively provided with double fork ears, and the middle rod body matches the limiting through hole; after the connecting double fork ear (3b) passes through the limiting through hole of the exciting head (2c) with one end of the double fork ear, the connecting double fork ear (3b) is limited in rotation in the exciting head (2c) by the limiting plane; or, The exciting head (2c) and the connecting double-fork ears (3b) fixedly connected to the two sides thereof are an integrated structure.

6. The testing device for blade root section flapping torsion loading according to claim 4 or 5, characterized in that: The swing actuator (4) comprises: a swing double fork ear and a swing actuator; The swing double fork ear is sleeved on the outside of the double fork ear at one end of the swing and twist actuator (3), and the swing double fork ear, the double fork ear at one end of the swing and twist actuator (3) and the loaded single fork ear (3c) on the same side are hinged by a connecting bolt (3a); the screw at the bottom of the swing double fork ear is threadedly connected to the swing actuator.

7. The testing device for blade root section flapping torsion loading according to claim 6, characterized in that: In the structure of the oscillating actuator (4), A rolling bearing is respectively installed in the fork ear holes on both sides of the fork ear connected to the double fork ear at one end of the connecting double fork ear (3b) via a connecting bolt (3a), so as to ensure that the double fork ear of the oscillating state can rotate around the axial direction of the connecting bolt (3a).

8. The testing device for blade root section flapping torsion loading according to claim 4, characterized in that: One end of the vibration head (2c) in the vibration loading mechanism (2) connected to the centrifugal force actuator (6) is configured as a double-fork ear structure; One end of the steel cable (5) is fixedly connected to the double-fork ear structure of the exciting head (2c) through a single fork ear and a bolt, and the other end is fixedly connected to the centrifugal actuator of the centrifugal force actuator (6) through a single fork ear and a bolt.

9. The testing device for blade root section flapping torsion loading according to any one of claims 1 to 8, characterized in that: The test device is used to horizontally install the test piece (7) through a fixing mechanism (1) before the test. Under the premise that the centrifugal force actuator (6) works normally, forces in opposite directions are simultaneously applied through the loading single fork ears on both sides of the swing and twist actuator (3). The relative magnitudes of the loading forces applied by the two swing and twist actuators are adjusted so that the loads meet the swing load and the torsion load to reach the test required load and the preset load ratio; finally, the swing load is adjusted so that the swing load meets the preset requirements.

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