Independent torque-loaded triple-mounted crowned blade vibration characteristic test device

Abstract

The invention discloses a vibration characteristic test device for a triple-crowned blade with independent torque loading. The friction block assembly and the blade mounting base are arranged in a "pin" shape and positioned by a bottom plate. A constraint mechanism and a loading mechanism are installed on the blade mounting base. The force loading structure of the loading mechanism is in an "L" shape, on which a slide rail is installed. A slide rail connecting block is installed on the slide rail and pressed against a base stop block by a spring. The invention adopts a horizontal layout scheme to reduce the structural size and improve the system stiffness, adopts an independent torque loading and transmission scheme to respectively load torques on the test blades, make the contact surface pressing force and the contact state conform to the actual state and reduce the load transmission loss, adopts a hydraulic constraint scheme to avoid the problem of constraint loosening caused by vibration, and adopts a bottom plate slide rail and a friction block screw to finely adjust the contact surface gap. The optimization in multiple aspects ensures the test accuracy.

Description

Technical Field

[0001] This invention belongs to the field of vibration testing devices for blades with crowns or shoulders, and specifically relates to a three-unit crowned blade vibration characteristic testing device with independent torque loading. Background Technology

[0002] Dry friction damping structures, such as blade crowns or shoulders, are commonly used in the vibration reduction design of turbine gas turbine blades. Vibration characteristic testing of these structures is crucial for effective vibration reduction design. Currently, vibration characteristic testing equipment for blade crowns or shoulders typically employs a vertical testing configuration. However, since blade crowns or shoulders are usually located at the top of the blade, a larger vertical testing equipment is required. Limited by factors such as weight and size, large-size vertical testing equipment suffers from insufficient structural stiffness, low resonant frequency, and susceptibility to resonant coupling, resulting in low testing accuracy.

[0003] Existing crowned or shouldered blades are often tested using single-blade or multi-blade testing devices. Multi-blade testing devices frequently employ a triple-blade assembly and measure the middle blade. This type of device can better simulate the vibration reduction effect of the blade crown compared to single-blade testing devices. Crowned or shouldered blades require a loading mechanism to provide clamping force between the contact surfaces. Currently, blade testing devices commonly apply pressure directly to the contact surfaces of the two outer blades or use a torque loading disk to apply torque to the contact surfaces of the two outer blades to simulate clamping force. However, these two loading methods result in a discrepancy between the contact state of the middle blade and the actual contact state when loading multi-blade testing devices, causing the clamping force and contact state to deviate from the design state. Currently, there is a lack of effective preload loading methods for testing the vibration characteristics of multi-blade crowned or shouldered blades. Furthermore, current testing devices typically use bolt tightening mechanisms to provide constraint on the blades. During testing, vibration can cause bolt loosening, leading to insufficient blade constraint and low testing accuracy. Summary of the Invention

[0004] To address the problems of low test accuracy, resonance coupling, and insufficient constraint caused by the large structural size, lack of effective loading methods, and loose constraints in existing multi-blade vibration characteristic testers with crowned or shouldered blades, this invention provides a three-unit crowned blade vibration characteristic test device with independent torque loading. It adopts a horizontal structural design to reduce structural size and avoid resonance coupling. An independent torque loading scheme is used to load each of the three blades separately to simulate the clamping force between the contact surfaces caused by centrifugal force under actual working conditions. An "L"-shaped force loading scheme is used to change the force loading direction and reduce structural size. A hydraulic mechanism is used to clamp and constrain the three blades separately, providing robust constraint. Slide rails and bearings are used to reduce force loss and torque transmission loss during loading.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A three-unit test device for the vibration characteristics of crowned blades under independent torque loading includes a base plate, a middle blade, two side blades, a blade mounting base, a loading mechanism, friction block assemblies, and a constraint mechanism, providing both an independent torque loading transmission scheme and a hydraulic constraint scheme. The test device adopts a horizontal, triangular arrangement, with the base plate providing positioning at the bottom. Crowned or shouldered blades are placed horizontally within the blade mounting base. The blade tenon tail is connected to the loading mechanism via a coupling sleeve. The constraint mechanism is positioned directly above the blade tenon. Friction block assemblies are arranged on both sides of the blade crown to provide boundary conditions for the blade crown contact surface.

[0007] The aforementioned independent torque-loaded triple-mounted crowned blade vibration characteristic test device adopts a horizontal arrangement scheme, with the blades placed horizontally. The blade installation height depends on the actual requirements, and the blade length determines the distance between the friction block assembly and the blade mounting base. Each component is independent of the others. The horizontal arrangement scheme has smaller structural dimensions in the vertical direction and does not change with the blade size, resulting in higher structural rigidity, higher resonance frequency, and avoiding resonance coupling between the test fixture and the blade, as well as between the test fixture components.

[0008] The aforementioned three-unit crowned blade vibration characteristic test device with independent torque loading has a base plate that provides positioning for each component through "well", "one" and "two" shaped protrusions. In addition, the "one" and "two" shaped protrusions can provide moving slides for the friction block assembly and excitation device.

[0009] The aforementioned three-unit crowned blade vibration characteristic test device with independent torque loading, wherein the middle blade and the two side blades are designed according to the test requirements, the blade tenon is a stepped shaft, and the tail end is an outer square structure; the stepped shaft includes three cylindrical structures, the first cylindrical surface provides constraint for the blade, the second cylindrical surface provides positioning for the blade; the outer square structure at the tail end of the blade tenon is connected to the loading mechanism for torque loading.

[0010] The aforementioned three-unit crowned blade vibration characteristic test device with independent torque loading, wherein the blade mounting base provides installation and positioning for the blade, loading mechanism, and constraint mechanism; the blade mounting base has three mounting holes at the blade end, providing installation positions for up to three blades; the mounting holes are stepped holes, the first section of the stepped hole mates with the first cylindrical surface of the blade's stepped shaft to provide constraint; the second section of the stepped hole installs a deep groove ball bearing and a cylindrical roller bearing, the inner ring of the bearing mates with the second cylindrical surface of the blade tenon to provide positioning for the blade; the blade, deep groove ball bearing, and cylindrical roller bearing are axially positioned by a first bushing, a second bushing, a third bushing, and a bearing pressure plate; the tail end of the blade tenon is axially tightened by a preload knob; the blade mounting base is a platform away from the blade end, providing an installation and bearing position for the loading mechanism; the top of the first section of the stepped hole in the blade mounting base has an opening, through which the constraint mechanism applies load to the blade to exert constraint.

[0011] The aforementioned three-unit crowned blade vibration characteristic test device with independent torque loading, wherein the loading mechanism provides torque to the crowned blade, causing the blade to twist and thus generating a clamping force on the blade crown contact surface; the loading mechanism is U-shaped, and the force loading scheme is L-shaped, that is, the force transmission path turns from the application direction to a direction perpendicular to the application direction. The main components include a torque loading base, a first force loading base, a second force loading base, a first loading shaft, a second loading shaft, and a third loading shaft; the torque loading base has three through holes, each through hole housing a deep groove ball bearing and a cylindrical roller bearing, with the first, second, and third loading shafts respectively mounted on the inner rings of the bearings; each loading shaft is axially positioned by a fourth bushing, a fifth bushing, and a bearing pressure plate; the tail ends of the first, second, and third loading shafts are axially clamped by a preload knob; and each loading shaft is equipped with a... There is a loading shaft plate; on both sides of the torque loading base are a first force loading base and a second force loading base, which are mounted on the torque loading base. The first and second force loading bases are equipped with three slide rails, and slide rail connecting blocks are installed on the slide rails. One end of the first and second force loading bases is equipped with a base stop, and the other end is equipped with three pulleys, which correspond to the three slide rails and the loading shaft plate respectively. One end of the slide rail connecting block is a stud, and a spring is fitted on the stud, which presses against the base stop. The tail end of the stud is tightened by a first nut and pressed against the base stop. The other end of the slide rail connecting block is connected to a force sensor, and the force sensor is equipped with a force loading screw. The force loading screw is connected to the loading shaft plate through a Kevlar cable, passing around the pulley. When loading, tightening the first nut causes the slide rail connecting block to move towards the base stop, which causes the Kevlar cable to tighten, thereby pulling the loading shaft plate and causing each loading shaft to rotate.

[0012] The aforementioned three-unit crowned blade vibration characteristic test device with independent torque loading includes a friction block assembly comprising a first friction block assembly and a second friction block assembly, which are located on both sides of the test blade crown. The first friction block assembly includes a first friction block mounting groove and a friction block, and the second friction block assembly includes a second friction block mounting groove and a friction block, with the friction blocks respectively mounted in the first and second friction block mounting grooves. Threaded holes are provided at the mating surfaces of the first and second friction block mounting grooves and the tail ends of the friction blocks, and screws are screwed into the threaded holes to press against the friction blocks and finely adjust their positions.

[0013] The aforementioned independent torque-loaded triple-mounted crowned blade vibration characteristic test device, including a constraint mechanism and hydraulic constraint scheme, comprises a hydraulic cylinder, a hydraulic cylinder base, a hydraulic support plate, a hydraulic support frame, a first clamping block, and a second clamping block. The hydraulic cylinder is mounted on the hydraulic cylinder base via its own threads. The hydraulic cylinder base is mounted on the hydraulic support plate, which is mounted on the hydraulic support frame. The hydraulic support frame is mounted on the test bench together with the blade mounting base via anchor bolts. The hydraulic pressure is applied to the middle blade and the two side blades, and then to the blade mounting base. The reaction force on the hydraulic cylinder is transmitted to the blade mounting base through the constraint mechanism, balancing the forces on the blade mounting base and preventing excessive deformation. The extended end of the hydraulic cylinder passes through the first section of the stepped hole in the blade mounting base and presses against the first clamping block, then against the second clamping block, and finally clamps the first cylindrical surface of the blade tenon.

[0014] The aforementioned three-unit crowned blade vibration characteristic test device with independent torque loading transmits torque to the middle and side blades through the loading mechanism via the coupling sleeve. Along the transmission path, the inner ring of the bearing is pressed by the coupling sleeve, preload knob, and bearing pressure plate, and the outer ring of the bearing is pressed by the coupling sleeve and bearing pressure plate. This achieves motion decoupling between the rotating parts and the stator, reducing torque transmission loss caused by friction along the torque transmission path.

[0015] The beneficial effects of this invention are as follows: The horizontal test fixture arrangement effectively reduces the structural dimensions of the test fixture, improves structural stiffness and resonance frequency, and effectively avoids resonance coupling between fixture components and between blades and the fixture; the three-unit blade test fixture design can be used for vibration characteristic tests of single, double, and triple blades; the base plate positioning provides accurate positioning for each component; and the independent torque loading and transmission scheme provides torque loading effects for the middle and side blades respectively, ensuring that the contact state and clamping force between the blade crown contact surfaces match the design effect and actual working state, reducing the torque transmission path... Torque loss due to friction; the loading mechanism of this invention adopts an "L"-shaped force loading scheme, reducing the size of the loading structure, providing elastic force to the slide rail connecting block through springs, and reducing force transmission loss through the slide rail, avoiding backlash loss during force loading; the constraint mechanism of this invention adopts a hydraulic constraint scheme, which can provide a robust constraint effect and avoid problems such as constraint loosening and insufficient constraint caused by resonance; the friction block assembly of this invention adjusts the gap between the friction block and the blade crown contact surface through the "I"-shaped raised slide rail on the base plate and screws, which has higher adjustment accuracy and can be used for tests where there is a gap in the contact surface of the crowned blade, and can also avoid the contact surface gap problem in tests without gaps. This invention improves the accuracy and reliability of the test device in terms of tooling layout, loading scheme, and constraint scheme. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a top view of the independent torque-loaded triple-mounted crowned blade vibration characteristic test device of the present invention;

[0018] Figure 2 Left view of the independent torque loading triple-mounted crowned blade vibration characteristic test device of the present invention;

[0019] Figure 3 This is a three-dimensional structural diagram of the independent torque-loaded triple-mounted crowned blade vibration characteristic test device of the present invention;

[0020] Figure 4 This is a three-dimensional structural diagram of the base plate;

[0021] Figure 5 This is a three-dimensional structural diagram of the intermediate blade of the test specimen;

[0022] Figure 6 Three-dimensional structural diagram of the blade mounting base and supporting parts;

[0023] Figure 7 A 3D structural diagram of the loading mechanism;

[0024] Figure 8This is a three-dimensional structural diagram of the first friction block assembly;

[0025] Figure 9 This is a three-dimensional structural diagram of the second friction block assembly;

[0026] Figure 10 A three-dimensional structural diagram of the constraint mechanism;

[0027] Figure 11 For along Figure 1 The first partial view in the cross-sectional view of line AA is a schematic diagram of the hydraulic constraint scheme.

[0028] Figure 12 For along Figure 1 The second partial view in the cross-sectional view along line AA is a schematic diagram of the independent torque loading and transmission scheme.

[0029] In the diagram: 1. Blade mounting base, 2. Bearing pressure plate, 3. Bearing baffle, 4. Preload knob, 5. Second clamping block, 6. First clamping block, 7. Anti-slip baffle, 8. Nylon support, 9. First bushing, 10. Second bushing, 11. Third bushing, 12. Side blades, 13. Middle blade, 14. Torque loading base, 15. First force loading base, 16. Second force loading base, 17. Base stop block, 18. Loading base accessories, 19. Slide rail connecting block, 20. Force loading screw, 21. Fourth bushing, 22. Fifth bushing, 23. First loading shaft, 24. Second loading shaft, 25. Third loading shaft, 26. Loading shaft plate, 27. Coupling sleeve, 28. Hydraulic cylinder base, 29. Hydraulic support plate, 30. Hydraulic support frame. 31. First pad, 32. Second pad, 33. First base plate positioning pad, 34. Second base plate positioning pad, 35. First displacement bolt base, 36. First positioning pin, 37. First friction block mounting groove, 38. Second friction block mounting groove, 39. Vibrator rear stop block, 40. Vibrator side stop block, 41. Base plate, 42. Second displacement bolt base, 43. Friction block, 44. First bolt, 45. First nut, 46. Second bolt, 47. Force sensor, 48. Slide rail, 49. Hydraulic cylinder, 50. Pulley, 51. Spring, 52. Screw, 53. Anchor bolt washer, 54. Anchor bolt, 55. Second nut, 56. Test bench, 57. Cylindrical roller bearing, 58. Deep groove ball bearing, 59. Second positioning pin. Detailed Implementation

[0030] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments.

[0031] refer to Figure 1 , Figure 2 and Figure 3The independent torque-loaded triple-mounted crowned blade vibration characteristic test device of the present invention includes a base plate 41, a test blade, a blade mounting base 1, and so on. Figure 6 The loading mechanism, friction block assembly, and as shown Figure 10 The constraint mechanism is shown. The test blade includes two side blades 12 and a middle blade 13, as shown in the figure. Figure 5 As shown. The friction block assembly includes, as shown... Figure 8 The first friction block assembly shown and as Figure 9 The second friction block assembly is shown.

[0032] The base plate 41 is placed on the test bench 56, and the structure of the base plate 41 is as follows: Figure 4 As shown, a first base plate positioning pad 33 is installed on the "I"-shaped protrusion on the base plate 41, and a second base plate positioning pad 34 is installed on the "well"-shaped protrusion on the base plate 41. Second pads 32 are installed on the first base plate positioning pads 33, the number of which is determined according to the test height. First friction block mounting grooves 37 and second friction block mounting grooves 38 are respectively installed on the second pads 32. Friction blocks 43 are installed in the first friction block mounting grooves 37 and second friction block mounting grooves 38, respectively. Screws 52 are installed in the first friction block mounting grooves 37 and second friction block mounting grooves 38, respectively. After the above parts are installed, they form the following configuration: Figure 8 The first friction block assembly shown and as Figure 9 The second friction block assembly shown has a first base plate positioning pad 33, a second pad 32, and a first friction block mounting groove 37 and a second friction block mounting groove 38 positioned by a first positioning pin 36. A first displacement bolt base 35 and a second displacement bolt base 42 are installed on the base plate 41 to adjust the position of the friction block assembly and the vibrator.

[0033] The first pad 31 is installed on the second base plate positioning pad 34. The number of first pads 31 is determined according to the test height. The blade mounting base 1 is installed on the first pad 31. The second base plate positioning pad 34, the first pad 31, and the blade mounting base 1 are positioned by the second positioning pin 59. Figure 6 As shown.

[0034] constraint mechanisms such as Figure 10 As shown, a hydraulic support plate 29 is installed on the hydraulic support frame 30, and a hydraulic cylinder base 28 is installed on the hydraulic support plate 29. The hydraulic cylinder 49 is connected to the hydraulic cylinder base 28 by its own thread.

[0035] The hydraulic load-bearing frame 30 of the constraint mechanism is installed on the blade mounting base according to the hole positions, and then installed on the test bench 56 using anchor bolts 54, anchor bolt washers 53, and second nuts 55. Figure 1 , Figure 2 and Figure 3 As shown.

[0036] Loading mechanism such as Figure 7 As shown, a first force loading base 15 and a second force loading base 16 are mounted on both sides of the torque loading base 14 and are fixed by loading base accessories 18. A pulley 50 and a slide rail 48 are mounted on the first force loading base 15 and the second force loading base 16. A base stop 17 is mounted on the top of the first force loading base 15 and the second force loading base 16, and a slide rail connecting block 19 is mounted on the slide rail 48. One end of the slide rail connecting block 19 is connected to a force sensor 47, and a force loading screw 20 is mounted on the force sensor. The other end of the slide rail connecting block 19 is pressed against the base stop 17 by a first nut 45 and a spring 51.

[0037] The first loading shaft 23, the second loading shaft 24 and the third loading shaft 25 are respectively installed in the three holes of the torque loading base 14, and the loading shaft plate 26 is installed at the tail end of the first loading shaft 23, the second loading shaft 24 and the third loading shaft 25. The loading shaft plate 26 is connected to the force loading screw 20 by passing around the pulley 50 through Kevlar wire.

[0038] Schematic diagram of independent torque loading and transmission scheme (reference) Figure 12 Cylindrical roller bearings 57 and deep groove ball bearings 58 are installed in the through holes of the torque loading base 14. The inner rings of the bearings are fitted with the first loading shaft 23, the second loading shaft 24, and the third loading shaft 25, which are axially positioned by the fourth bushing 21, the fifth bushing 22, and the bearing pressure plate 2, and axially tightened by the preload knob 4. The torque output ends of the first loading shaft 23, the second loading shaft 24, and the third loading shaft 25 have an outer square structure and are connected to the outer square ends of the two side blades 12 and the middle blade 13 by the coupling sleeve 27. Cylindrical roller bearings 57 and deep groove ball bearings 58 are installed in the blade mounting base 1. The inner rings of the bearings are fitted with the two side blades 12 and the middle blade 13, which are axially positioned by the first bushing 9, the second bushing 10, the third bushing 11, the bearing baffle 3, and the bearing pressure plate 2, and axially tightened by the preload knob 4.

[0039] Hydraulic constraint scheme schematic diagram reference Figure 11 The second clamping block 5 and the first clamping block 6 are installed in the blade mounting base 1. The blade mounting base 1 is equipped with an anti-slip baffle 7 to prevent the second clamping block 5 from moving. The nylon bracket 8 provides axial positioning for the first clamping block 6 and the second clamping block 5.

[0040] A first displacement bolt base 35 is installed on the base plate 41, and a first bolt 44 is installed on the first displacement bolt base 35. Rotating the first bolt 44 pushes against the friction block assembly to adjust the position of the friction block assembly, and fine-tuning screw 52 makes the friction block 43 fit with the blade contact surface. A vibrator rear stop block 39 and a vibrator side stop block 40 are installed on the base plate 41 to fix the position of the vibrator. A second displacement bolt base is installed on the base plate 41, and a second bolt 46 is installed on it to adjust the position of the vibrator.

[0041] After the above parts are assembled, rotating the first nut 45 causes the slide rail connecting block 19 to move, thereby tightening the Kevlar cable and pulling the loading shaft plate 26, causing the first loading shaft 23, the second loading shaft 24, and the third loading shaft 25 to rotate. The loading load is determined based on the tension value measured by the force sensor 47. After the loading mechanism has completed its function, the hydraulic cylinder 49 is pressurized, pressing the first clamping block 6 and the second clamping block 5, thereby pressing the blade to provide a restraining effect.

Claims

1. A three-unit crowned blade vibration characteristic test device with independent torque loading, comprising a base plate (41), a test blade, a blade mounting base (1), a loading mechanism, a friction block assembly, and a constraint mechanism, characterized in that: The blade mounting base (1) and friction block assembly are arranged in a triangular shape, with the base plate (41) providing positioning for each assembly. The base plate (41) is equipped with a first displacement bolt base (35) and a second displacement bolt base (42) to adjust the position of the friction block assembly and the vibrator. The loading mechanism is installed on the platform of the blade mounting base (1) and connected to the test blade through a coupling sleeve (27). The constraint mechanism is installed on the blade mounting base (1) and uses a hydraulic mechanism to apply pressure to the tenon of the test blade from above the blade mounting base (1). The loading mechanism includes a torque loading base, a first force loading base, a second force loading base, a first loading shaft, a second loading shaft, and a third loading shaft. The torque loading base has three through holes, each housing a deep groove ball bearing and a cylindrical roller bearing. The inner rings of the bearings respectively house the first, second, and third loading shafts. Each loading shaft is axially positioned by a fourth bushing, a fifth bushing, and a bearing pressure plate. The tail ends of the first, second, and third loading shafts are axially clamped by a preload knob. Each loading shaft is followed by a loading shaft plate. The first and second force loading bases are located on either side of the torque loading base, and the first and second force loading bases are mounted on the torque loading base. The second force loading base is equipped with three slide rails, and slide rail connecting blocks are installed on the slide rails. One end of the first and second force loading bases is equipped with a base stop, and the other end is equipped with three pulleys, which correspond to the three slide rails and the loading shaft plate respectively. One end of the slide rail connecting block is a stud, and a spring is fitted on the stud, which presses against the base stop. The tail end of the stud is tightened onto the base stop by a first nut. The other end of the slide rail connecting block is connected to a force sensor, and the force sensor is equipped with a force loading screw. The force loading screw is connected to the loading shaft plate by passing around the pulley through a Kevlar cable. When loading occurs, tightening the first nut causes the slide rail connecting block to move towards the base stop, which in turn tightens the Kevlar cable, thereby pulling the loading shaft plate and causing each loading shaft to rotate.

2. The three-unit crowned blade vibration characteristic test device with independent torque loading according to claim 1, characterized in that, The base plate (41) provides mounting positioning for the blade mounting base (1), the first pad (31), and the second base plate positioning pad (34) through the "well" shaped protrusions, and provides positioning for the friction block assembly through the "one" shaped protrusions.

3. The three-unit crowned blade vibration characteristic test device with independent torque loading according to claim 1, characterized in that, The first friction block mounting groove (37), the second friction block mounting groove (38), the second pad (32), and the first base plate positioning pad (33) of the friction block assembly are positioned by the first positioning pin (36). The rear end of the friction block assembly is tightened by the first displacement bolt base (35) and the first bolt (44). Rotating the first bolt (44) causes the friction block assembly to slide along the "I"-shaped slide rail of the base plate (41). The gap between the friction block (43) and the blade crown contact surface of the blades (12) on both sides is finely adjusted by the screw (52).

4. The three-unit crowned blade vibration characteristic test device with independent torque loading according to claim 1, characterized in that, The loading mechanism adopts an "L"-shaped force loading method. The direction of the pulling force is changed by the pulley (50). The pulling force is measured by the force sensor (47). The force sensor (47) is installed on the slide rail connecting block (19) and then on the slide rail (48). The slide rail connecting block (19) moves along the direction of the slide rail (48) by the rotation of the first nut (45). The slide rail connecting block (19) is pressed on the base stop block (17) by the spring (51) and the first nut (45) to provide the slide rail connecting block (19) with the rebound force.

5. The three-unit crowned blade vibration characteristic test device with independent torque loading according to claim 1, characterized in that, The tenon of the intermediate blade (13) adopts the form of a stepped shaft. The stepped shaft provides the positioning surface and constraint surface for the intermediate blade (13). The blade structure can be designed according to the test requirements.

6. The three-unit crowned blade vibration characteristic test device with independent torque loading according to claim 1, characterized in that, The constraint mechanism adopts hydraulic constraint. The hydraulic cylinder (49) applies hydraulic pressure to the first clamping block (6) and the second clamping block (5), thereby pressing the cylindrical surface of the test blade tenon against the blade mounting base (1). The hydraulic cylinder (49) is installed on the constraint mechanism composed of the hydraulic cylinder base (28), the hydraulic bearing plate (29) and the hydraulic bearing frame (30), and the constraint mechanism is installed on the blade mounting base (1).

7. The three-unit crowned blade vibration characteristic test device with independent torque loading according to claim 1, characterized in that, Deep groove ball bearings (58) and cylindrical roller bearings (57) are mounted on blade mounting base (1) and torque loading base (14); the blade passes through the inner ring of the deep groove ball bearings (58) and cylindrical roller bearings (57) in the blade mounting base (1), and the inner ring of the bearing is pressed by the first bushing (9), the second bushing (10) and the preload knob (4), and the outer ring of the bearing is pressed by the third bushing (11), the bearing baffle (3) and the bearing pressure plate (2); the first loading shaft (23), the second loading shaft (24) and the third loading shaft (25) pass through the inner ring of the deep groove ball bearings (58) and cylindrical roller bearings (57) in the torque loading base (14), and the inner ring of the bearing is pressed by the fourth bushing (21) and the preload knob (4), and the outer ring of the bearing is pressed by the fifth bushing (22) and the bearing pressure plate (2).

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