Device for measuring static moment of fan blade of single turbofan engine

Abstract

The utility model discloses a device for measuring the static moment of a fan blade of a single turbofan engine, and relates to the technical field of fan blades of turbofan engines. The device comprises a lever mechanism, a pressure sensor and a data processing system, the lever mechanism comprises a spindle, a main counterweight, a blade chuck, a supporting seat and a horizontal indicator, the main counterweight is located at the top of the left end of the spindle, the blade chuck is located at the right end of the spindle, and the supporting seat is connected with the spindle through a pivot; the level indicator is positioned on the spindle; and clamping grooves of the blade chucks are used for clamping the blades. According to the utility model, the high-precision static moment pressure sensor is adopted, so that the measurement precision can be improved, and errors are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fan blades of a turbofan engine, and more specifically to a device for measuring the static moment of a fan blade of a single turbofan engine. Background Art

[0002] The fan blades of a turbofan engine are the main components for generating thrust. They are often large in size and weight and have a complex shape, which leads to large differences in their static moments. The measurement and sorting methods of the blade moments have a direct impact on the final equilibrium state, which in turn has a key impact on the overall vibration of the engine when it is working.

[0003] In the existing technical solutions, the static balance characteristics of fan blades are usually measured by comparing a mechanical balance with a standard blade, but this method has the following disadvantages:

[0004] 1) Low measurement accuracy: The measurement accuracy of a mechanical balance is affected by many factors, such as temperature, humidity, vibration, etc., making it difficult to obtain accurate results.

[0005] 2) Low measurement efficiency: The mechanical balance has a slow measurement speed and requires repeated installation of standard blades for comparative measurement, which cannot meet the needs of large-scale and high-efficiency production.

[0006] 3) Poor stability: Standard blades will inevitably wear and bump during frequent disassembly and assembly, which poses a risk of damaging the blades. The weight will also change after long-term use, causing the measurement results to shift.

[0007] Therefore, it is necessary to develop a device for measuring the static torque of a single-piece turbofan engine fan blade using digital technology without the need for frequent installation of standard blades. Utility Model Content

[0008] The purpose of the utility model is to overcome the shortcomings of the above-mentioned background technology and to provide a device for measuring the static moment of a fan blade of a single-piece turbofan engine.

[0009] In order to achieve the above-mentioned object, the technical solution of the utility model is: a device for measuring the static moment of a fan blade of a single-piece turbofan engine, characterized in that it includes a lever mechanism, a pressure sensor and a data processing system;

[0010] The lever mechanism comprises a main shaft, a main counterweight, a blade chuck, a support seat and a level indicator, wherein the main counterweight is located at the top of the left end of the main shaft, the blade chuck is located at the right end of the main shaft, and the support seat is connected to the main shaft through a pivot; the level indicator is located on the main shaft;

[0011] The spindle is connected to a pressure sensor via a pressure guide rod, and the pressure sensor is connected to a data processing system;

[0012] The clamping groove of the blade clamp clamps the blade.

[0013] In the above technical solution, a fine-tuning counterweight is provided at the left end of the main shaft.

[0014] In the above technical solution, a rotary handle is provided above the clamping groove of the blade clamp.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1) The utility model adopts a high-precision static moment pressure sensor, which can improve measurement accuracy and reduce errors.

[0017] 2) The automatic data processing system of the utility model can quickly process a large amount of data and improve measurement efficiency.

[0018] 3) The utility model does not need to touch the fan blades, thus avoiding the risk of damaging the blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Among them, 1-lever mechanism, 11-main shaft, 12-main counterweight, 13-blade chuck, 131-rotating handle, 14-support seat, 15-level indicator, 16-fine-tuning counterweight, 2-pressure sensor, 21-pressure guide rod, 3-data processing system, 4-blade. DETAILED DESCRIPTION

[0021] The following is a detailed description of the implementation of the utility model in conjunction with the accompanying drawings, but they do not constitute a limitation of the utility model and are only used as examples. At the same time, the advantages of the utility model will become clearer and easier to understand through the description.

[0022] Referring to the attached drawings, it can be seen that: a device for measuring the static moment of a fan blade of a single-piece turbofan engine is characterized by comprising a lever mechanism 1, a pressure sensor 2 and a data processing system 3;

[0023] The lever mechanism 1 comprises a main shaft 11, a main counterweight 12, a blade chuck 13, a support seat 14 and a level indicator 15, wherein the main counterweight 12 is located at the top of the left end of the main shaft 11, the blade chuck 13 is located at the right end of the main shaft 11, and the support seat 14 is connected to the main shaft 11 through a pivot 141; the level indicator 15 is located on the main shaft 11;

[0024] The spindle 11 is connected to the pressure sensor 2 via a pressure guide rod 21, and the pressure sensor 2 is connected to the data processing system 3;

[0025] The clamping groove of the blade clamp 13 clamps the blade 4 .

[0026] A fine-tuning weight 16 is disposed at the left end of the main shaft 11 .

[0027] A rotating handle 131 is disposed above the clamping groove of the blade clamp 13 .

[0028] During measurement, the fan blade 4 is placed on the blade clamp 13 of the lever mechanism 1. Through the lever mechanism 1, the force generated by the blade 4 on the main shaft 11 is transmitted to the pressure sensor 2 through the pressure guide rod 21. The pressure sensor 2 measures the pressure value and transmits the data to the data processing system 3 for processing. Finally, the measurement result is displayed through the operation interface system.

[0029] In actual use, the method of using the utility model includes the following steps:

[0030] First, use a standard blade to "calibrate" the equipment. After calibration, there is no need to repeat the calibration within a certain period of time (about 1 calendar month); install the standard blade on the blade chuck 13 at the right end of the main shaft 11. The shape of the clamping groove of the blade chuck 13 is determined according to the basic size of the blade 4. There is a torque-generating handle 131 above the clamping groove of the blade chuck 13, which can provide an equal clamping force when holding the blade 4; after the standard blade is installed, the gravity torque effect it generates passes through the main shaft 11 and generates a rotation tendency through the pivot 141, causing the left side of the main shaft 11 to tilt up. A main counterweight 12 is installed on the left side of the main shaft 11. The main counterweight 12 is used to balance the torque generated by the blade 4 so that the main shaft 11 tends to be horizontal. The balance of the current system can be judged by the display of the level indicator 15 on the main shaft 11. By rotating the fine-tuning weight 16, the display on the level indicator 15 can be made to reach a horizontal state. After the main shaft 11 reaches a horizontal state, the current position of the fine-tuning weight 16 is marked with a marker pen to confirm that the position of the fine-tuning weight 16 remains unchanged before the next calibration. At this time, the pressure guide rod 21 on the main shaft 11 transmits the pressure on the main shaft to the pressure sensor 2 below. The pressure sensor 2 measures the force value generated at this time, and the force value is transmitted to the data processor 3 through the data line. The static moment value of the current standard blade is calculated on the data processor 3 according to the existing program.

[0031] The data processor 3 is set to record the static moment value of the standard blade and the value measured by the pressure sensor 2, and then the handle of the blade clamp 13 can be loosened to remove the standard blade, and then the blade to be tested can be installed according to the installation method of the standard blade; at this time, the main counterweight 12 and the fine-tuning counterweight 16 on the equipment cannot be changed. After installing the blade to be tested, check the display of the level indicator 15. If the system does not reach a horizontal state, it is necessary to install an additional counterweight at a specific position to adjust the horizontal state of the main shaft 11.

[0032] If the horizontal indicator 15 shows that the left side of the main shaft 11 is higher and the right side is lower, it means that the blade to be tested is heavier than the standard blade. Therefore, it is necessary to place an appropriate amount of lead wire as needed at the additional counterweight placement point on the top of the main counterweight 12. When the horizontal indicator 15 reaches a horizontal state, remove all the lead wires used as additional counterweights, weigh the weight of the lead wires, and then put the lead wires back to the additional counterweight placement point on the top of the main counterweight 12. At this time, if the horizontal indicator 15 shows horizontal, it means that the additional counterweight is added correctly. Otherwise, the amount of lead wire should be readjusted until the horizontal state can be restored after removing and then inserting the additional counterweight lead wire. After the system reaches the horizontal state, the pressure sensor 2 measures the current pressure value, which is transmitted to the data processor 3 via the data line; because the installation position of the additional counterweight is designed and processed, its position parameters have been set in advance in the software formula of the data processor 3. The weight of the additional counterweight is input on the data processor 3, and the data processor 3 will display the gravity moment of the current blade to be tested.

[0033] If the horizontal indicator 15 shows that the right side of the main shaft 11 is higher and the left side is lower, it means that the blade to be tested is lighter than the standard blade. Therefore, it is necessary to place an appropriate amount of lead wire as needed at the additional counterweight placement point on the top of the blade clamp 13. When the horizontal indicator 15 reaches a horizontal state, remove all the lead wires used as additional counterweights, weigh the weight of the lead wires, and then put the lead wires back to the additional counterweight placement point on the top of the blade clamp 13. At this time, if the horizontal indicator 15 shows horizontal, it means that the additional counterweight is added correctly. Otherwise, the amount of lead wire should be readjusted until the horizontal state can be restored after removing and then inserting the additional counterweight lead wire. After the system reaches the horizontal state, the pressure sensor 2 measures the current pressure value, which is transmitted to the data processor 3 via the data line; because the installation position of the additional counterweight is designed and processed, its position parameters have been set in advance in the software formula of the data processor 3. The weight of the additional counterweight is input on the data processor 3, and the data processor 3 will display the gravity moment of the current blade to be tested.

[0034] Through the above operation, the static moment value of blade 4 is obtained, and the static moment value is engraved in the non-matching contact area at the root of blade 4, so that the blade installer can read the value easily; when the turbofan engine needs to replace the fan blades, the maintenance personnel can measure the static moment value of the removed blade according to the above method, measure the static moment of the blade to be installed, compare the static moment values ​​of the two, accurately select and judge whether the blade to be installed is suitable, and the closer the installation gravity moment value of blade 4 is, the easier and more convenient the dynamic balancing and debugging work after installation will be, which can reduce the number of engine test runs and the working hours of personnel.

[0035] Because the equipment uses digital technology, there is no need to frequently install standard blades. This can extend the service life of standard blades while reducing errors caused by subtle changes in standards due to slow wear and tear.

[0036] Other parts not described belong to the prior art.

Claims

1. A device for measuring the static moment of a fan blade of a single-piece turbofan engine, characterized in that: It comprises a lever mechanism (1), a pressure sensor (2) and a data processing system (3); The lever mechanism (1) comprises a main shaft (11), a main counterweight (12), a blade clamp (13), a support seat (14) and a level indicator (15), wherein the main counterweight (12) is located at the top of the left end of the main shaft (11), the blade clamp (13) is located at the right end of the main shaft (11), and the support seat (14) is connected to the main shaft (11) via a pivot (141); and the level indicator (15) is located on the main shaft (11); The main shaft (11) is connected to a pressure sensor (2) via a pressure guide rod (21), and the pressure sensor (2) is connected to a data processing system (3); The clamping groove of the blade clamp (13) clamps the blade (4).

2. The device for measuring the static moment of a fan blade of a single-piece turbofan engine according to claim 1, characterized in that: A fine-tuning counterweight (16) is provided at the left end of the main shaft (11).

3. The device for measuring the static moment of a fan blade of a single-piece turbofan engine according to claim 1, characterized in that: A rotating handle (131) is arranged above the clamping groove of the blade clamp (13).

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