Blade rotation excitation test device

Abstract

The invention discloses a blade rotation excitation test device, and relates to the technical field of blade tests. The device comprises a device body, a driving motor is installed on the device body, the output end of the driving motor is connected with a test rotor, a plurality of nozzles are arranged on the periphery of the test rotor in the radial direction, and a vacuum cavity is formed in the device body. An oil collecting oil tank is arranged at the bottom of the vacuum cavity to collect sprayed oil, an oil collecting cover is arranged on the upper side in the vacuum cavity, an annular oil tank is arranged on the upper side in the oil collecting cover, a circulating mechanism is arranged between the bottom of the oil collecting cover and the annular oil tank, and an adjusting assembly is arranged between the annular oil tank and the nozzle. And the collected oil liquid is conveyed back to the nozzle again, a complete cycle is completed, the operation is convenient and simple, the cost is relatively low compared with the whole machine test, and the function of the excitation test of the blade in the rotating environment is realized.

Description

Technical Field

[0001] This invention belongs to the field of blade testing technology, and in particular relates to a blade rotation excitation test device. Background Technology

[0002] As a key component of gas turbines, blades are often damaged by vibration. During the development process, their strength is evaluated through theoretical calculations, component tests, and whole-machine tests.

[0003] Whole-machine testing can effectively simulate vibration sources. However, resonance and blade breakage during whole-machine testing often lead to the destruction of multiple blades in the first stage or even multiple stages, resulting in huge testing costs and risks. It also leads to extended development cycles and even the risk of delays. Component testing is generally conducted on a static test bench to test its fatigue limit, which cannot simulate vibration under rotating conditions and differs from the real situation.

[0004] Therefore, it is particularly important to invent a test device for evaluating the vibration of blades in a rotating environment.

[0005] To address this issue, we designed a blade rotation excitation test device. Summary of the Invention

[0006] This invention provides a blade rotation excitation test apparatus for testing blades in a component-level testing environment, specifically on a rotary disk tester.

[0007] The present invention includes a device body on which a drive motor is mounted. The output end of the drive motor is connected to a test rotor. Several nozzles are radially arranged around the periphery of the test rotor. A vacuum chamber is provided inside the device body. A vacuum pump is installed on one side of the device body. The pumping end of the vacuum pump is connected to the vacuum chamber. An oil collecting hood is provided on the upper side inside the vacuum chamber. The oil collecting hood has a funnel-shaped cross-section, and the lower part of the test rotor is placed inside the oil collecting hood. An annular oil tank is provided on the upper side inside the oil collecting hood. The nozzles are located inside the oil collecting hood. A circulation mechanism is provided between the bottom of the oil collecting hood and the annular oil tank. An adjustment component is provided between the annular oil tank and the nozzles.

[0008] The circulation mechanism includes an oil collection tank. An oil collection tank pad is fixedly installed on the bottom cover of the inner cavity of the vacuum chamber. The oil collection tank is installed on the oil collection tank pad. An oil inlet hole is opened at the top of the oil collection tank. The bottom end of the oil collection cover is connected to the oil inlet hole at the top of the oil collection tank, and a filter screen is provided at the oil inlet hole.

[0009] An external oil tank is provided on the outside of the device body. A return oil pump is connected to one side of the external oil tank. The oil inlet of the return oil pump is connected to the bottom of the oil collection tank through an oil suction pipe. A booster pump is connected to the side of the external oil tank away from the return oil pump. An oil delivery pipe is connected to the oil outlet of the booster pump. An oil pipe adapter plate is provided on the device body. An oil distributor is installed on the oil pipe adapter plate. The end of the oil delivery pipe away from the booster pump is connected to the oil distributor. The oil distributor is connected to the annular oil tank through several oil delivery pipes.

[0010] The adjustment assembly includes adjustable rods, an upper mounting ring, an inner sliding rod mounting ring, an outer sliding rod mounting ring, a slider, a sliding rod, and connecting rods. Several adjustable rods are circumferentially fixed to the upper side inside the vacuum chamber. The lower ends of several adjustable rods are fixedly connected to the upper mounting ring. The outer sliding rod mounting ring is located below the upper mounting ring. The inner sliding rod mounting ring is located within the outer sliding rod mounting ring. Several connecting rods are located between the upper mounting ring and the outer sliding rod mounting ring. Several sliding rods are located between the inner and outer sliding rod mounting rings. The slider is slidably mounted on the sliding rod. The nozzle is installed at the oil outlet on the slider. Several telescopic oil pipes are connected to the annular oil tank. Each telescopic oil pipe corresponds to a slider, and the end of each telescopic oil pipe furthest from the annular oil tank is connected to the oil inlet on the slider.

[0011] The upper end of the connecting rod is fixedly connected to the upper mounting ring. The outer ring of the sliding rod mounting ring has several through holes. The connecting rod is movably fitted with the through holes. The outer ring of the sliding rod mounting ring is provided with several fastening bolts. The fastening bolts correspond one-to-one with the through holes, and the fastening bolts cooperate with the connecting rod. The slider is provided with locking bolts, and the locking bolts cooperate with the sliding rod.

[0012] The upper port of the vacuum chamber is provided with a chamber cover. The oil pipe adapter plate and the oil distributor are both installed on the chamber cover. A vibration meter and a trigger controller are sequentially arranged outside the device body. A speed sensor is installed on one side of the output shaft of the drive motor. Trigger signal lines are connected between the trigger controller and the device body, and between the vibration meter and the trigger controller. The vibration meter, the trigger controller, and the speed sensor are all connected to an external overspeed tester control and acquisition system.

[0013] The test rotor includes a blade body, strain gauges, lead wire disks, a wheel body, a transfer disk, a mandrel, a flexible main shaft, and test leads. The lower end of the flexible main shaft is connected to the mandrel, and the mandrel has a hollow structure. The transfer disk is located at the end of the mandrel away from the flexible main shaft. Several lead wire disks are located on the side of the transfer disk away from the mandrel. The mandrel, transfer disk, and lead wire disks are fixedly connected by several bolts. Several wheel bodies are fixed to the transfer disk by bolts, and the lead wire disks are in contact with the wheel bodies. The blade body is located at the end of the wheel body away from the lead wire disks, and the strain gauge is located between the wheel body and the blade body. The test leads are connected to the strain gauges, and the test leads are routed through the surfaces of the blade body, the wheel body, and the lead wire disks.

[0014] A high-speed slip ring is installed on the cavity cover. A strain gauge and a strain acquisition computer are connected to each other outside the cavity cover. The test lead is led out to the outside of the vacuum cavity through a hollow mandrel and a flexible spindle, and connected to the high-speed slip ring installed on the cavity cover. The high-speed slip ring and the strain gauge are connected by a wire.

[0015] The present invention has the following beneficial effects:

[0016] This invention controls a drive motor to rotate a test rotor at high speed. A vacuum pump evacuates the vacuum chamber to reduce power loss caused by the high-speed rotation of the test rotor. During the test, oil is sprayed out through a nozzle, generating an excitation source. An oil collection tank at the bottom of the vacuum chamber collects the sprayed oil. With the cooperation of the circulation mechanism and the adjustment components, the oil is returned to the nozzle, thus completing one complete cycle. This invention has the advantages of convenient and simple operation, easy installation and disassembly, relatively low cost compared to whole-machine testing, low test risk, and a more realistic simulation environment compared to a static blade vibration table. It realizes the function of excitation testing of blades in a rotating environment.

[0017] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a simplified structural diagram of a blade rotation excitation test device according to the present invention;

[0020] Figure 2This is a schematic diagram of the wiring of strain gauges in a blade rotation excitation test device according to the present invention.

[0021] The attached diagram lists the components represented by each number as follows:

[0022] 1. Return oil pump; 2. External oil tank; 3. Booster pump; 4. Oil distributor; 5. Oil pipe adapter plate; 6. Adjustable distance boom; 7. Annular oil tank; 8. Upper mounting ring; 9. Chamber cover; 10. Oil collection cover; 11. Inner ring for slide rod mounting; 12. Outer ring for slide rod mounting; 13. Nozzle; 14. Slider; 15. Sliding rod; 16. Connecting boom; 17. Oil collection tank; 18. Oil collection tank pad; 19. Filter screen; 20. Vacuum chamber; 21. Vacuum pump; 22. Trigger signal line; 23. Vibration meter; 24. Trigger controller; 25. Speed ​​sensor; 26. Drive motor; 27. High-speed slip ring; 28. Strain gauge; 29. ​​Strain acquisition computer; 30. Blade body; 31. Strain gauge; 32. Lead wire reel; 33. Wheel body; 34. Adapter plate; 35. Mandrel; 36. Flexible spindle; 37. Test lead wire. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1-2 As shown, the present invention is a blade rotation excitation test device, including a device body, a drive motor 26 installed on the device body, a test rotor connected to the output end of the drive motor 26, a plurality of nozzles 13 radially arranged around the test rotor, a vacuum chamber 20 arranged inside the device body, a vacuum pump 21 installed on one side of the device body, the pumping end of the vacuum pump 21 being connected to the vacuum chamber 20, an oil collection hood 10 arranged on the upper side inside the vacuum chamber 20, the oil collection hood 10 having a funnel-shaped cross-section, and the lower part of the test rotor being placed inside the oil collection hood 10, an annular oil tank 7 arranged on the upper side inside the oil collection hood 10, the nozzles 13 being arranged inside the oil collection hood 10, a circulation mechanism arranged between the bottom of the oil collection hood 10 and the annular oil tank 7, and an adjustment component arranged between the annular oil tank 7 and the nozzles 13.

[0025] The circulation mechanism includes an oil collection tank 17, an oil collection tank pad 18 is fixedly installed on the bottom cover of the inner cavity of the vacuum chamber 20, the oil collection tank 17 is installed on the oil collection tank pad 18, an oil inlet hole is opened at the top of the oil collection tank 17, the bottom end of the oil collection cover 10 is connected to the oil inlet hole at the top of the oil collection tank 17, and a filter screen 19 is provided at the oil inlet hole.

[0026] An external oil tank 2 is provided on the outside of the device body. A return oil pump 1 is connected to one side of the external oil tank 2. The oil inlet of the return oil pump 1 is connected to the bottom of the oil collection tank 17 through an oil suction pipe. A booster pump 3 is connected to the side of the external oil tank 2 away from the return oil pump 1. An oil delivery pipe is connected to the oil outlet of the booster pump 3. An oil pipe adapter plate 5 is provided on the device body. An oil distributor 4 is installed on the oil pipe adapter plate 5. The end of the oil delivery pipe away from the booster pump 3 is connected to the oil distributor 4. The oil distributor 4 is connected to the annular oil tank 7 through several oil delivery pipes.

[0027] The adjustment assembly includes adjustable rods 6, upper mounting rings 8, inner sliding rings 11, outer sliding rings 12, sliders 14, sliding rods 15, and connecting rods 16. Several adjustable rods 6 are fixed in a circular shape on the upper side inside the vacuum chamber 20. The lower ends of several adjustable rods 6 are fixedly connected to the upper mounting rings 8. The outer sliding rings 12 are located below the upper mounting rings 8. The inner sliding rings 11 are located in the inner ring of the outer sliding rings 12. Several connecting rods 16 are located between the upper mounting rings 8 and the outer sliding rings 12. Several sliding rods 15 are located between the inner sliding rings 11 and the outer sliding rings 12. The slider 14 is slidably mounted on the sliding rods 15. The nozzle 13 is installed at the oil outlet on the slider 14. Several telescopic oil pipes are connected to the annular oil tank 7. Several telescopic oil pipes correspond one-to-one with the slider 14, and the end of the telescopic oil pipe away from the annular oil tank 7 is connected to the oil inlet on the slider 14.

[0028] The upper end of the connecting rod 16 is fixedly connected to the upper mounting ring 8. The outer ring 12 of the sliding rod mounting has several through holes. The connecting rod 16 is movably fitted with the through holes. The outer ring 12 of the sliding rod mounting has several fastening bolts. The fastening bolts correspond one-to-one with the through holes, and the fastening bolts cooperate with the connecting rod 16. The slider 14 is equipped with locking bolts, which cooperate with the sliding rod 15.

[0029] The upper port of the vacuum chamber 20 is provided with a chamber cover 9. The oil pipe adapter plate 5 and the oil separator 4 are all installed on the chamber cover 9. The vibration meter 23 and the trigger controller 24 are arranged in sequence on the outside of the device body. The speed sensor 25 is installed on one side of the output shaft of the drive motor 26. The trigger controller 24 and the device body and the vibration meter 23 and the trigger controller 24 are connected by trigger signal lines 22. The vibration meter 23, the trigger controller 24 and the speed sensor 25 are all connected to the external overspeed tester control and acquisition system.

[0030] The test rotor includes a blade body 30, a strain gauge 31, a lead wire disk 32, a wheel body 33, a transfer disk 34, a spindle 35, a flexible main shaft 36, and test leads 37. The lower end of the flexible main shaft 36 is connected to the spindle 35, which is a hollow structure. The transfer disk 34 is located at the end of the spindle 35 away from the flexible main shaft 36. Several lead wire disks 32 are located on the side of the transfer disk 34 away from the spindle 35. The spindle 35, the transfer disk 34, and the lead wire disks 32 are fixedly connected by several bolts. Several wheel bodies 33 are fixed to the transfer disk 34 by bolts, and the lead wire disks 32 are in contact with the wheel bodies 33. The blade body 30 is located at the end of the wheel body 33 away from the lead wire disks 32, and the strain gauge 31 is located between the wheel body 33 and the blade body 30. The test leads 37 are connected to the strain gauges 31 and are routed through the surfaces of the blade body 30, the wheel body 33, and the lead wire disks 32.

[0031] A high-speed slip ring 27 is installed on the cavity cover 9. A strain gauge 28 and a strain acquisition computer 29 are connected to each other outside the cavity cover 9. The test lead 37 is led out to the outside of the vacuum chamber 20 through the hollow mandrel 35 and the flexible spindle 36, and is connected to the high-speed slip ring 27 installed on the cavity cover 9. The high-speed slip ring 27 and the strain gauge 28 are connected by wires.

[0032] Specific implementation method one: Combining Figure 1 This embodiment describes the working principle as follows: the overspeed tester control and acquisition system drives the test rotor to rotate at high speed by controlling the drive motor 26. The vacuum chamber 20 is evacuated by the vacuum pump 21 to reduce the power loss caused by the high speed rotation of the test rotor. The oil collection tank 17 at the bottom of the vacuum chamber 20 collects the sprayed oil. During the test, the return oil pump 1 pumps the liquid in the vacuum chamber 20 to the external oil tank 2 through the oil collection tank 17. The liquid is pressurized by the booster pump 3 and then transported to the oil distributor 4. It is then transported to the annular oil tank 7 through several oil delivery pipes. The oil is then divided into several telescopic oil pipes and transported to the oil inlet of the slider 14. The oil is then sprayed out through the nozzle 13 installed on the slider 14, generating an excitation source. The sprayed oil is collected by the oil collection cover 10 and filtered by the filter screen 19 before flowing into the oil collection tank 17. It is then pumped back to the external oil tank 2 by the return oil pump 1. Thus, the oil completes one complete cycle.

[0033] In this embodiment, the number of oil supply pipes and telescopic oil pipes is determined according to the test requirements. The nozzle 13 can achieve simultaneous oil supply through multiple oil lines. Oil supply with different numbers of nozzles 13 can be achieved by blocking excess oil outlets. The nozzles 13 can be uniformly arranged in the circumferential direction to simulate the stator structure of a gas turbine, or they can be non-uniformly arranged in the circumferential direction to simulate the deviator vibration of the blades. The shape of the nozzle 13 can be circular, umbrella-shaped, or expanding.

[0034] Specific Implementation Method Two: Combining Figure 2This embodiment further defines the test rotor described in Specific Embodiment 1. In this embodiment, the test lead 37 of the strain gauge 31 is routed through the surfaces of the blade body 30, the wheel body 33, and the lead disk 32. The routed wires are free-form and symmetrical. The purpose of this is to minimize the imbalance of the test rotor. Then, the wires are led out to the outside of the vacuum chamber 20 through the hollow spindle 35 and the flexible main shaft 36, and connected to the high-speed slip ring 27 installed on the chamber cover 9. Vibration response data is acquired through the strain gauge 28 and the strain acquisition computer 29. Other components and connection methods are the same as in Specific Embodiment 1.

[0035] Specific implementation method three: Combining Figure 1 This embodiment further defines the oil separator 4 in the first embodiment. In this embodiment, the oil separator 4 and the oil pipe adapter plate 5 are installed on the cavity cover 9 and connected to the annular oil tank 7 through several oil delivery pipes. Other components and connection methods are the same as in the first embodiment.

[0036] Specific implementation method four: Combination Figure 1 This embodiment further defines the annular oil tank 7 in the first embodiment. In this embodiment, the annular oil tank 7 is installed on the upper mounting ring 8, suspended below the cavity cover 9 via the adjustable rod 6, and connected to the oil inlet of the slider 14 via several telescopic oil pipes.

[0037] In this embodiment, the distance of the adjustable rod 6 can be axially adjusted by the screwing depth of the nut. The function of the annular oil tank 7 is to collect oil and ensure that the flow rate and pressure of each injector are not too different, so as to ensure the accuracy of the test.

[0038] Specific Implementation Method Five: Combining Figure 1 This embodiment further defines the slider 14 in the first embodiment. In this embodiment, the slider 14 is mounted on the sliding rod 15. The two ends of the sliding rod 15 are respectively mounted on the inner ring 11 and the outer ring 12 of the sliding rod mounting. It is suspended from the upper mounting ring 8 via the connecting rod 16. Other components and connection methods are the same as in the first embodiment.

[0039] In this embodiment, the slider 14 can slide along the sliding rod 15 to adjust the radial distance between the nozzle 13 and the blade body 30. It can also rotate along the sliding rod 15 to adjust the spray angle of the oil relative to the blade body 30. The slider 14 is locked in place by the locking bolts on the slider 14. The slider 14 can also adjust the distance by adjusting the screw depth of the fastening bolts on the outer ring 12 of the sliding rod mounting, thereby adjusting the axial distance between the nozzle 13 and the blade body 30.

[0040] Specific Implementation Method Six: Combination Figure 1 This embodiment further defines the oil collecting tank 17 in Specific Embodiment 1. In this embodiment, the oil collecting tank 17 is fixed to the bottom cover of the vacuum chamber 20 by the oil collecting tank gasket 18, which ensures the airtightness of the chamber. Other components and connection methods are the same as in Specific Embodiment 1.

[0041] Specific implementation method seven: Combining Figure 1 This embodiment further defines the overspeed tester control and acquisition system described in Specific Embodiment 1. In this embodiment, the overspeed tester control and acquisition system controls the trigger signal line 22, vibration meter 23, trigger controller 24, and speed sensor 25. When the test rotor vibrates excessively or breaks, the fragments will cut off the trigger signal line 22, sending a signal to the trigger controller 24, thereby triggering a stop signal and causing the tester to stop operating. Other components and connection methods are the same as in Specific Embodiment 1.

[0042] It should be further noted that the installation structure, connection method, or setting method of each component in this invention are all common mechanical methods. As long as they can achieve their beneficial effects, they can be implemented. At the same time, the return oil pump 1, booster pump 3, oil distributor 4, vacuum pump 21, vibration meter 23, trigger controller 24, speed sensor 25, drive motor 26, strain gauge 28, and strain acquisition computer 29 in this invention are all purchased from the market. Those skilled in the art can install and use them according to the requirements.

Claims

1. A blade rotation excitation test device, comprising a device body, wherein a drive motor (26) is mounted on the device body, characterized in that, The output end of the drive motor (26) is connected to the test rotor. Several nozzles (13) are arranged radially around the test rotor. A vacuum chamber (20) is arranged inside the device body. A vacuum pump (21) is installed on one side of the device body. The pumping end of the vacuum pump (21) is connected to the vacuum chamber (20). An oil collection hood (10) is arranged on the upper side inside the vacuum chamber (20). The cross-section of the oil collection hood (10) is a funnel-shaped structure. The lower part of the test rotor is placed inside the oil collection hood (10). An annular oil tank (7) is arranged on the upper side inside the oil collection hood (10). The nozzles (13) are arranged inside the oil collection hood (10). A circulation mechanism is arranged between the bottom of the oil collection hood (10) and the annular oil tank (7). An adjustment component is arranged between the annular oil tank (7) and the nozzles (13).

2. The blade rotation excitation test device according to claim 1, characterized in that, The circulation mechanism includes an oil collection tank (17), an oil collection tank pad (18) is fixedly installed on the bottom cover of the inner cavity of the vacuum chamber (20), the oil collection tank (17) is installed on the oil collection tank pad (18), an oil inlet hole is opened at the top of the oil collection tank (17), the bottom end of the oil collection cover (10) is connected to the oil inlet hole at the top of the oil collection tank (17), and a filter screen (19) is provided at the oil inlet hole.

3. The blade rotation excitation test device according to claim 2, characterized in that, An external oil tank (2) is provided on the outside of the device body. A return oil pump (1) is connected to one side of the external oil tank (2). The oil inlet of the return oil pump (1) is connected to the bottom of the oil collection tank (17) through an oil extraction pipe. A booster pump (3) is connected to the side of the external oil tank (2) away from the return oil pump (1). An oil delivery pipe is connected to the oil outlet of the booster pump (3). An oil pipe adapter plate (5) is provided on the device body. An oil distributor (4) is installed on the oil pipe adapter plate (5). The end of the oil delivery pipe away from the booster pump (3) is connected to the oil distributor (4). The oil distributor (4) is connected to the annular oil tank (7) through several oil delivery pipes.

4. The blade rotation excitation test device according to claim 3, characterized in that, The adjustment assembly includes adjustable rods (6), an upper mounting ring (8), a sliding rod mounting inner ring (11), a sliding rod mounting outer ring (12), a slider (14), a sliding rod (15), and connecting rods (16). Several adjustable rods (6) are circumferentially fixed to the upper side inside the vacuum chamber (20). The lower ends of several adjustable rods (6) are fixedly connected to the upper mounting ring (8). The sliding rod mounting outer ring (12) is located below the upper mounting ring (8). The sliding rod mounting inner ring (11) is located within the inner ring of the sliding rod mounting outer ring (12). Several connecting rods (16) are... The boom (16) is set between the upper mounting ring (8) and the outer ring (12) of the slide rod mounting. Several slide rods (15) are set between the inner ring (11) and the outer ring (12) of the slide rod mounting. The slider (14) is slidably set on the slide rods (15). The nozzle (13) is installed at the oil outlet on the slider (14). Several telescopic oil pipes are connected to the annular oil tank (7). Several telescopic oil pipes correspond one-to-one with the slider (14), and the end of the telescopic oil pipe away from the annular oil tank (7) is connected to the oil inlet on the slider (14).

5. The blade rotation excitation test device according to claim 4, characterized in that, The upper end of the connecting rod (16) is fixedly connected to the upper mounting ring (8). The outer ring (12) of the sliding rod mounting has several through holes. The connecting rod (16) is movably fitted with the through holes. The outer ring (12) of the sliding rod mounting has several fastening bolts. The fastening bolts correspond one-to-one with the through holes, and the fastening bolts cooperate with the connecting rod (16). The slider (14) has locking bolts. The locking bolts cooperate with the sliding rod (15).

6. The blade rotation excitation test device according to claim 5, characterized in that, The upper port of the vacuum chamber (20) is provided with a chamber cover (9). The oil pipe adapter plate (5) and the oil separator (4) are both installed on the chamber cover (9). A vibration meter (23) and a trigger controller (24) are sequentially arranged outside the device body. A speed sensor (25) is installed on one side of the output shaft of the drive motor (26). A trigger signal line (22) is connected between the trigger controller (24) and the device body, and between the vibration meter (23) and the trigger controller (24). The vibration meter (23), the trigger controller (24), and the speed sensor (25) are all connected to the external overspeed tester control and acquisition system.

7. The blade rotation excitation test device according to claim 6, characterized in that, The test rotor includes a blade body (30), strain gauges (31), lead wire disks (32), a wheel body (33), a transfer disk (34), a mandrel (35), a flexible main shaft (36), and test leads (37). The lower end of the flexible main shaft (36) is connected to the mandrel (35). The mandrel (35) has a hollow structure. The transfer disk (34) is located at the end of the mandrel (35) away from the flexible main shaft (36). Several lead wire disks (32) are located on the side of the transfer disk (34) away from the mandrel (35). The mandrel (35), the transfer disk (34), and the lead wire disks (37) are all connected together. The components are fixedly connected by several bolts. Several of the wheel bodies (33) are fixed to the adapter plate (34) by bolts. The lead wire plate (32) is in contact with the wheel body (33). The blade body (30) is located at the end of the wheel body (33) away from the lead wire plate (32). The strain gauge (31) is located between the wheel body (33) and the blade body (30). The test lead wire (37) is connected to the strain gauge (31). The test lead wire (37) is wired through the surfaces of the blade body (30), the wheel body (33), and the lead wire plate (32).

8. The blade rotation excitation test device according to claim 7, characterized in that, A high-speed slip ring (27) is installed on the cavity cover (9). A strain gauge (28) and a strain acquisition computer (29) are connected to each other outside the cavity cover (9). The test lead (37) is led out to the outside of the vacuum cavity (20) via a hollow mandrel (35) and a flexible spindle (36) and connected to the high-speed slip ring (27) installed on the cavity cover (9). The high-speed slip ring (27) and the strain gauge (28) are connected by a wire.

Images