Aero-engine blade strength detection device

Abstract

The utility model relates to the technical field of aero-engine blade strength detection, in particular to an aero-engine blade strength detection device which comprises a bottom plate, the upper end of the bottom plate is fixedly connected with two connecting plates, a second lead screw is rotatably connected between the two connecting plates, and the outer wall of the second lead screw is in threaded connection with an adjusting block. A pressure sensor is installed at the upper end of the adjusting block, a pressing plate abutting against the upper end of the pressure sensor is arranged above the adjusting block, and a U-shaped pressed rod is installed at the upper end of the pressing plate; the pressure sensor, the pressing plate and the U-shaped pressed rod move leftwards or rightwards by a certain distance, then the other sample is fixed, the bending strength is detected, and due to the fact that the position of the U-shaped pressed rod can be freely adjusted leftwards and rightwards, pressure can be conveniently applied to different positions of the sample so as to simulate the stress condition of a blade in the current situation, and the test accuracy is improved. Therefore, the purpose of improving the comprehensiveness, accuracy and reliability of bending strength detection is achieved.

Description

Technical Field

[0001] This utility model relates to the field of aero-engine blade strength testing technology, specifically an aero-engine blade strength testing device. Background Technology

[0002] Aero engines are highly complex and precise thermodynamic machines. As the heart of an aircraft, they not only power flight but also serve as a crucial driving force for the development of aviation. Every significant revolution in human aviation history is inextricably linked to advancements in aero engine technology. Turbine blades are a vital component of the turbine section in gas turbine engines. These high-speed rotating blades are responsible for drawing high-temperature, high-pressure gas into the combustor to sustain engine operation. To ensure stable, long-term operation under extreme high-temperature and high-pressure conditions, turbine blades are often forged from high-temperature alloys and cooled using various methods, such as internal airflow cooling, boundary layer cooling, or thermal barrier coatings, to guarantee operational reliability. Bending strength testing is used to assess the blade's resistance to bending loads.

[0003] In the existing technology, when testing the bending strength of aero-engine blades, it is necessary to clamp one end of the sample to be tested with a fixture, and then apply pressure to the sample to be tested evenly with an indenter until the sample bends and fails. During this process, the failure load value is recorded to evaluate the bending strength of the blade.

[0004] However, the pressure applied by the indenter is fixed in the above method, and pressure can only be applied to one position of the sample under test. However, in actual operation, aero-engine blades may be subjected to forces from different directions and positions, and their bending strength may vary at different positions. Therefore, the above method cannot fully reflect the overall bending strength characteristics of the blade, thus limiting the accuracy and reliability of the test. Therefore, it is necessary to propose an aero-engine blade strength testing device to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide an aero-engine blade strength testing device, which facilitates applying pressure to different positions of the sample to simulate the stress conditions of the blade under current conditions, thereby improving the comprehensiveness, accuracy and reliability of bending strength testing.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an aero-engine blade strength testing device, comprising a base plate, two connecting plates fixedly connected to the upper end of the base plate, a second lead screw rotatably connected between the two connecting plates, an adjusting block threadedly connected to the outer wall of the second lead screw, a pressure sensor mounted on the upper end of the adjusting block, a pressure plate abutting against the upper end of the pressure sensor above the adjusting block, a U-shaped pressure rod mounted on the upper end of the pressure plate, and a digital display screen above the base plate;

[0007] A drive mechanism is provided at the left end of the second lead screw;

[0008] A frame is fixedly connected to the upper end of the base plate, a first lead screw is rotatably connected inside the frame, a first motor with its output end fixedly connected to the first lead screw is installed at the upper end of the frame, and a lifting block is threadedly connected to the outer wall of the first lead screw.

[0009] A U-shaped frame is fixedly connected to the left end of the lifting block, and a hydraulic cylinder is installed at the upper end of the U-shaped frame. The output end of the hydraulic cylinder passes through the upper end of the U-shaped frame and is fixedly connected to a clamping plate.

[0010] To drive the second lead screw to rotate and prevent it from rotating arbitrarily, in a preferred embodiment of the aero-engine blade strength testing device of this utility model, the driving mechanism includes a drive frame fixedly connected to the left end of the left connecting plate. A worm gear is rotatably connected inside the drive frame. A second motor with its output end fixedly connected to the worm gear is installed on the outer wall of the drive frame. A worm wheel is meshed with the outer wall of the worm gear. A transmission rod passing through the left connecting plate is fixedly connected between the worm wheel and the second lead screw.

[0011] In order to facilitate maintaining the horizontal position of the pressure plate, as a preferred embodiment of the aero-engine blade strength testing device of this utility model, the upper end of the adjusting block is fixedly connected to four guide rods that penetrate the pressure plate and are slidably connected to it.

[0012] To facilitate the installation of the digital display screen, in a preferred embodiment of the aero-engine blade strength testing device of this utility model, a vertical plate is fixedly connected to the upper end of the base plate, and the digital display screen is installed on the left end of the vertical plate.

[0013] To facilitate improved stability of the adjustment block movement, in a preferred embodiment of the aero-engine blade strength testing device of this utility model, a dovetail-shaped groove is provided at the upper end of the base plate, and a dovetail-shaped slider that is fixedly connected to the adjustment block is slidably connected inside the dovetail-shaped groove.

[0014] To improve the stability of the lifting block's movement, in a preferred embodiment of the aero-engine blade strength testing device of this utility model, a groove is provided on the right side of the inner wall of the frame, and a slider that is fixedly connected to the lifting block is slidably connected inside the groove.

[0015] To prevent the pressure plate from detaching from the outer wall of the four guide rods, as a preferred embodiment of the aero-engine blade strength testing device of this utility model, a limiting disc is fixedly connected to the upper end of each of the four guide rods.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] One end of the sample is brought into contact with the right side of the inner wall of the U-shaped frame. The clamping plate then moves downward to clamp the sample. The U-shaped frame and the fixed sample move downward again, bringing the sample into contact with the U-shaped compression rod. The sample applies downward pressure to the U-shaped compression rod, which in turn applies pressure to the pressure sensor via the pressure plate. The pressure sensor transmits the detected pressure value to the digital display screen via an analog-to-digital converter and a microprocessor, facilitating the observation and recording of the values ​​until the sample shows bending damage (exceeding the maximum allowable bending amount). The load value of the bending damage is recorded to assess the bending strength of the sample. Subsequently, the pressure sensor, pressure plate, and U-shaped compression rod are moved a certain distance to the left or right, and another sample is fixed for bending strength testing. Since the position of the U-shaped compression rod can be freely adjusted left and right, it is convenient to apply pressure to different positions of the sample to simulate the stress situation of the blade in the current situation, thereby improving the comprehensiveness, accuracy, and reliability of bending strength testing. Attached Figure Description

[0018] Figure 1 This is a front sectional view of the present invention.

[0019] Figure 2 This is a partial right-side cross-sectional view of the present invention;

[0020] Figure 3 This is a structural diagram of the connection at the U-shaped frame of this utility model.

[0021] In the diagram: 1. Base plate; 2. Frame; 3. First lead screw; 4. First motor; 5. Lifting block; 6. U-shaped frame; 7. Hydraulic cylinder; 8. Clamping plate; 9. Connecting plate; 10. Second lead screw; 11. Adjusting block; 12. Pressure sensor; 13. Pressure plate; 14. U-shaped pressure rod; 15. Drive frame; 16. Worm gear; 17. Worm wheel; 18. Second motor; 19. Digital display screen; 20. Vertical plate; 21. Guide rod. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] Please see Figures 1 to 3 An aero-engine blade strength testing device includes a base plate 1, with two connecting plates 9 fixedly connected to the upper end of the base plate 1. A second lead screw 10 is rotatably connected between the two connecting plates 9. An adjusting block 11 is threadedly connected to the outer wall of the second lead screw 10. A pressure sensor 12 is installed on the upper end of the adjusting block 11. A pressure plate 13 is provided above the adjusting block 11, abutting against the upper end of the pressure sensor 12. A U-shaped pressure rod 14 is installed on the upper end of the pressure plate 13. A digital display screen 19 is provided above the base plate 1.

[0025] A drive mechanism is provided at the left end of the second lead screw 10;

[0026] A frame 2 is fixedly connected to the upper end of the base plate 1. A first lead screw 3 is rotatably connected inside the frame 2. A first motor 4 with its output end fixedly connected to the first lead screw 3 is installed at the upper end of the frame 2. A lifting block 5 is threadedly connected to the outer wall of the first lead screw 3.

[0027] A U-shaped frame 6 is fixedly connected to the left end of the lifting block 5. A hydraulic cylinder 7 is installed at the upper end of the U-shaped frame 6. The output end of the hydraulic cylinder 7 passes through the upper end of the U-shaped frame 6 and is fixedly connected to a clamping plate 8.

[0028] In this embodiment: During use, one end of the sample is moved into the interior of the U-shaped frame 6 and brought into contact with the right side of the inner wall of the U-shaped frame 6. Then, the hydraulic cylinder 7 is controlled to move the clamping plate 8 downward a certain distance, thereby clamping the sample through the clamping plate 8. Then, the first motor 4 is controlled to drive the first lead screw 3 to rotate, thereby driving the lifting block 5 to move downward slowly. At the same time, the U-shaped frame 6 and the fixed sample are moved downward, so that the sample comes into contact with the U-shaped pressure rod 14 and applies downward pressure to the U-shaped pressure rod 14 through the sample. Then, the pressure plate 13 applies pressure to the pressure sensor 12. The pressure sensor 12 transmits the detected pressure value to the digital display screen 19 through the analog-to-digital converter and the microprocessor (the analog-to-digital converter and the microprocessor are mature existing technologies, so they are not shown in the figure), which facilitates the observation and recording of the values. It should be noted that when the U-shaped pressure rod 14 is not under the pressure of the sample, the value on the digital display screen 19 is calibrated to zero, thereby improving the convenience of use, until the sample is bent and damaged (exceeding the maximum allowable bending amount), and the load value of the bending damage is recorded to evaluate the bending strength of the sample.

[0029] Subsequently, the second lead screw 10 is rotated by the drive mechanism, which in turn causes the adjusting block 11 to move a certain distance to the left or right. At the same time, the pressure sensor 12, the pressure plate 13, and the U-shaped pressure rod 14 are moved a certain distance to the left or right. Then, another sample is fixed and the bending strength is tested in the same way as above. Since the position of the U-shaped pressure rod 14 can be freely adjusted left and right, the support position of the sample can be adjusted. In this way, it is convenient to apply pressure to different positions of the sample to simulate the stress situation of the blade in the current situation, thereby improving the comprehensiveness, accuracy and reliability of the bending strength test.

[0030] As a technical optimization of this utility model, the driving mechanism includes a driving frame 15 fixedly connected to the left end of the left connecting plate 9. A worm gear 16 is rotatably connected inside the driving frame 15. A second motor 18 with its output end fixedly connected to the worm gear 16 is installed on the outer wall of the driving frame 15. A worm wheel 17 is meshed with the outer wall of the worm gear 16. A transmission rod passing through the left connecting plate 9 is fixedly connected between the worm wheel 17 and the second lead screw 10.

[0031] In this embodiment: the second motor 18 is controlled to drive the worm gear 16 to rotate, which in turn drives the worm wheel 17 to rotate, and drives the second lead screw 10 to rotate through the transmission rod. Since the worm gear 16 and the worm wheel 17 have a self-locking characteristic, the second lead screw 10 can be prevented from rotating arbitrarily.

[0032] As a technical optimization of this utility model, the upper end of the adjusting block 11 is fixedly connected to four through pressure plates 13 and slidably connected to them.

[0033] In this embodiment, a guide rod 21 is provided to maintain the horizontal position of the pressure plate 13.

[0034] As a technical optimization of this utility model, a vertical plate 20 is fixedly connected to the upper end of the base plate 1, and a digital display screen 19 is installed on the left end of the vertical plate 20.

[0035] In this embodiment, a support plate 20 is provided to facilitate the installation of the digital display screen 19.

[0036] As a technical optimization of this utility model, a dovetail-shaped groove is provided at the upper end of the base plate 1, and a dovetail-shaped slider that is fixedly connected to the adjusting block 11 is slidably connected inside the dovetail-shaped groove.

[0037] In this embodiment, a dovetail groove and a dovetail slider are provided to improve the stability of the movement of the adjusting block 11.

[0038] As a technical optimization of this utility model, a sliding groove is provided on the right side of the inner wall of the frame 2, and a slider that is fixedly connected to the lifting block 5 is slidably connected inside the sliding groove.

[0039] In this embodiment, a slider and a groove are provided to improve the stability of the movement of the lifting block 5.

[0040] As a technical optimization of this utility model, the upper ends of the four guide rods 21 are all fixedly connected with limiting discs.

[0041] In this embodiment, four limiting discs are provided to prevent the pressure plate 13 from detaching from the outer wall of the four guide rods 21.

[0042] Working principle: In use, firstly, move one end of the sample into the interior of the U-shaped frame 6, making it abut against the right side of the inner wall of the U-shaped frame 6. Then, control the hydraulic cylinder 7 to drive the clamping plate 8 to move downward a certain distance, thereby clamping the sample through the clamping plate 8. Then, control the first motor 4 to drive the first lead screw 3 to rotate, thereby driving the lifting block 5 to move downward slowly, and at the same time, driving the U-shaped frame 6 and the fixed sample downward, so that the sample comes into contact with the U-shaped pressure rod 14, and applies downward pressure to the U-shaped pressure rod 14 through the sample. The pressure is then sensed by the pressure plate 13. Pressure is applied by the device 12, and the pressure sensor 12 transmits the detected pressure value to the digital display screen 19 via the analog-to-digital converter and microprocessor (the analog-to-digital converter and microprocessor are mature existing technologies and are therefore not shown in the figure), which facilitates the observation and recording of the values. It should be noted that when the U-shaped pressure rod 14 is not subjected to the pressure of the specimen, the value on the digital display screen 19 is calibrated to zero, thereby improving the ease of use, until the specimen is bent and damaged (exceeding the maximum allowable bending amount), and the load value of the bending damage is recorded to evaluate the bending strength of the specimen.

[0043] The second motor 18 is then controlled to drive the worm gear 16 to rotate, which in turn drives the worm wheel 17 to rotate. This, in turn, drives the second lead screw 10 to rotate via the transmission rod, thereby causing the adjusting block 11 to move a certain distance to the left or right. Simultaneously, the pressure sensor 12, the pressure plate 13, and the U-shaped pressure rod 14 are moved a certain distance to the left or right. Another sample is then fixed and subjected to bending strength testing in the same manner as described above. Since the position of the U-shaped pressure rod 14 can be freely adjusted left and right, the support position of the sample can be adjusted. In this way, pressure can be applied to different positions of the sample to simulate the stress situation of the blade under current conditions, thereby improving the comprehensiveness, accuracy, and reliability of the bending strength test.

[0044] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for testing the strength of an aero-engine blade, comprising a base plate (1), characterized in that: Two connecting plates (9) are fixedly connected to the upper end of the base plate (1). A second lead screw (10) is rotatably connected between the two connecting plates (9). An adjusting block (11) is threadedly connected to the outer wall of the second lead screw (10). A pressure sensor (12) is installed on the upper end of the adjusting block (11). A pressure plate (13) is provided above the adjusting block (11) and abuts against the upper end of the pressure sensor (12). A U-shaped pressure rod (14) is installed on the upper end of the pressure plate (13). A digital display screen (19) is provided above the base plate (1). A drive mechanism is provided at the left end of the second lead screw (10); The upper end of the base plate (1) is fixedly connected to a frame (2), and the inside of the frame (2) is rotatably connected to a first lead screw (3). The upper end of the frame (2) is equipped with a first motor (4) whose output end is fixedly connected to the first lead screw (3). The outer wall of the first lead screw (3) is threadedly connected to a lifting block (5). The left end of the lifting block (5) is fixedly connected to a U-shaped frame (6), and a hydraulic cylinder (7) is installed at the upper end of the U-shaped frame (6). The output end of the hydraulic cylinder (7) passes through the upper end of the U-shaped frame (6) and is fixedly connected to a clamping plate (8).

2. The aero-engine blade strength testing device according to claim 1, characterized in that: The driving mechanism includes a drive frame (15) fixedly connected to the left end of the left connecting plate (9). A worm gear (16) is rotatably connected inside the drive frame (15). A second motor (18) with its output end fixedly connected to the worm gear (16) is installed on the outer wall of the drive frame (15). A worm wheel (17) is meshed with the outer wall of the worm gear (16). A transmission rod passing through the left connecting plate (9) is fixedly connected between the worm wheel (17) and the second lead screw (10).

3. The aero-engine blade strength testing device according to claim 1, characterized in that: The upper end of the adjusting block (11) is fixedly connected to four through pressure plates (13) and slidably connected to them, and guide rods (21) are also fixedly connected to them.

4. The aero-engine blade strength testing device according to claim 1, characterized in that: The upper end of the base plate (1) is fixedly connected to the upright plate (20), and the digital display screen (19) is installed on the left end of the upright plate (20).

5. The aero-engine blade strength testing device according to claim 1, characterized in that: The upper end of the base plate (1) is provided with a dovetail-shaped groove, and a dovetail-shaped slider that is fixedly connected to the adjusting block (11) is slidably connected inside the dovetail-shaped groove.

6. The aero-engine blade strength testing device according to claim 1, characterized in that: A sliding groove is provided on the right side of the inner wall of the frame (2), and a slider that is fixedly connected to the lifting block (5) is slidably connected inside the sliding groove.

7. The aero-engine blade strength testing device according to claim 3, characterized in that: Each of the four guide rods (21) has a limiting disc fixedly connected to its upper end.

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