Method for measuring static moment of blade

Abstract

The invention discloses a method for measuring the static moment of a blade, which is characterized in that a blade mounting station is arranged, the influence of a traditional mode of directly inserting the blade into a tool on a static moment measuring platform is eliminated, and automatic centering and positioning are realized through butt joint matching of a test seat for mounting and transferring a test body and a static moment measuring instrument; the technical problems of vibration, torsion and the like caused by the mode that the mechanical arm is directly inserted into and pulled out of a tenon-and-mortise joint, a pin hole and the like on the static moment measuring instrument are solved, and the testing precision and repeatability of the static moment measuring instrument are guaranteed; a transfer test body is also established and installed, the distance between the theoretical mass center of the blade and the test rotation center is guaranteed before the test state, direct measurement of the static moment is achieved, the test precision is high, and the working efficiency is good.

Description

Technical Field

[0001] The invention relates to the technical field of blade static moment testing, and in particular to a method for measuring the static moment of a blade. Background Art

[0002] Blades are the "heart" and important core components of power systems such as aircraft engines, gas turbines and steam turbines. The static moment of the blades (static moment value, mass moment, etc.) and the residual imbalance technical indicators of blade arrangement are directly related to the performance, efficiency and reliability of aircraft engines, gas turbines and steam turbine equipment.

[0003] During blade manufacturing, the physical quantity of each blade's static moment must be controlled. Aircraft engines, gas turbines, and steam turbines consist of one or more blade groups, such as 36, 74, or 96 blades. Before installation, the static imbalance of each blade group must be calculated. The installation position and sequence of each blade must be arranged, and the remaining imbalance must be controlled to an acceptable value to meet technical requirements.

[0004] During the manufacturing and maintenance of aircraft engines, gas turbines, and steam turbines, due to the large number of blades, complex shapes, and the fact that most of them are installed with mortise and tenon joints, the measurement of each blade is difficult and the workload of sorting multiple blades is also large. Therefore, the functions of automatic blade clamping, automatic blade static moment measurement, and automatic blade installation and sorting cannot be realized.

[0005] Currently, the equipment for measuring blade static torque includes knife-edge torque scales and rotary torque scales, with test accuracy at the 1gm and 0.1gm levels.

[0006] When measuring with a knife-edge moment scale, the blade is directly mounted on the moment scale, and then the sliding weight and counterweight of the moment scale are adjusted for measurement. However, the following problems exist:

[0007] 1. The establishment of tooling distance (theoretical center of mass to rotation center) and adjustment of sliding weights are labor-intensive;

[0008] 2. Most blades have a multiple mortise and tenon (pin hole) structure, which is difficult to plug and unplug. The connection structure determines that it is very difficult to plug and unplug the blades. The vibration or force during plugging and unplugging directly affects the accuracy of the static moment measurement results of the blades. Direct plugging and unplugging on the torque scale often generates internal force or torque, etc., resulting in accidental errors and abnormal static moment measurement data.

[0009] When measuring with a rotary moment scale, the blade is directly mounted on the moment scale and then rotated for measurement. This has the following problems:

[0010] 1. The tooling distance (theoretical center of mass to test rotation center) is difficult to establish, and the blade tooling and blade need to be balanced separately, which is a cumbersome process;

[0011] 2. Directly plugging and unplugging on the torque scale will often generate internal force or torque, resulting in accidental errors and abnormal static moment measurement data. Summary of the Invention

[0012] The object of the present invention is to provide a method for measuring the static moment of a blade, which can improve the accuracy and repeatability of the blade static moment measurement.

[0013] In order to solve the above technical problems, the present invention provides the following technical solutions: A method for measuring the static moment of a blade, comprising the following steps: (1) establishing a balanced installation and transportation test body on a static moment measuring instrument, wherein the installation and transportation test body has a blade fixture for mounting and cooperating with the blade to be measured; (2) the installation and transportation test body is in a stable state, and a blade to be measured is mounted on the blade fixture; (3) the installation and transportation test body is matched with the static moment measuring instrument, and the static moment measuring instrument measures the torque value of the blade to be measured; (4) after the test is completed, the installation and transportation test body is separated from the static moment measuring instrument, and the blade is taken out; (5) steps (2), (3), and (4) are repeated to perform static moment measurement on all blades in a group.

[0014] Furthermore, in step (1), the installation and transportation test body also has a test support for supporting and fixing the blade fixture and a balance block for leveling. The test support and the static moment measuring instrument are docked in a docking manner.

[0015] Furthermore, in step (1), by adjusting the weight or installation position of the balance block on the test support, after the test support is docked with the static moment measuring instrument, the test requirements under no-load and blade installation states are met.

[0016] Furthermore, after the installation and transportation test body loaded with blades is docked with the static torque measuring instrument, the distance between the theoretical center of mass of the blade and the test rotation center of the static torque measuring instrument is the distance from the actual blade to the rotation center of the engine.

[0017] Furthermore, in step (2), a test support for installing the transfer test body is docked and matched with an installation platform. The installation platform can clamp and stably install the transfer test body. When the transfer test body is installed in a stable state, a blade to be tested is installed on the blade tooling.

[0018] Furthermore, in step (3), the installation platform releases its grip on the installation and transportation test body, and grabs the installation and transportation test body through a robotic arm, and the test support of the installation and transportation test body is docked on the static moment measuring instrument through a docking fit.

[0019] Furthermore, in step (4), after the test is completed, the transfer test body is grabbed and installed by a robotic arm, and the test support on which the transfer test body is installed is re-docked and matched on the installation platform, and the blade is taken out after the transfer test body is clamped and fixed by the installation platform.

[0020] Furthermore, in step (4), after the test is completed, the installation and transfer test body is grabbed by the robotic arm, and the test support for the installation and transfer test body is docked and matched on the disassembly platform, and the installation and transfer test body is clamped and fixed by the disassembly platform and then the blade is taken out; after the blade is taken out, the installation and transfer test body is transferred by the robotic arm, and the test support for the installation and transfer test body is re-docked and matched on the installation platform.

[0021] Furthermore, in step (2), the transport test body is supported by a lifting device, the transport test body is arranged above the static moment measuring instrument, and the transport test body is fixed by a locking device.

[0022] Furthermore, in step (3), the fixing of the installed transfer test body is loosened by the locking device, and the installed transfer test body is driven down by the lifting device, so that the test support of the installed transfer test body is docked with the static moment measuring instrument; in step (4), after the test is completed, the installed transfer test body is lifted by the lifting device, and the installed transfer test body is fixed by the locking device and then the blade is taken out.

[0023] 1. It realizes the fully automatic blade static moment measurement, filling the technical gap.

[0024] 2. Setting up a blade installation station solves many technical problems such as vibration and torque generated by the robot arm directly inserting and pulling out mortise and tenon joints and pin holes on the static torque measuring instrument, ensuring the accuracy and repeatability of the blade static torque measurement.

[0025] 3. Set up an installation and transfer test body. The blade and the installation and transfer test body are connected by mortise and tenon or pin hole. The installation and transfer test body and the installation platform, static moment measuring instrument and disassembly platform are matched with each other up and down, which reduces the technical requirements for the mechanical arm to install the blade and ensures the reliability of the static moment measuring instrument.

[0026] 4. By standardizing the installation and transportation of test bodies, the problem of adjusting the static moment measuring instrument for blades of different weights and different sizes and technical specifications can be solved, which has the advantages of high efficiency and good versatility.

[0027] 5. By using the same test support, replacing the blade tooling and adjusting the blade tooling position and adjusting the corresponding balance block, it is also possible to solve the problem of needing to adjust the static moment measuring instrument for blades of different weights and different size technical specifications. It has the advantages of high efficiency and good versatility.

[0028] 6. Set up product standard bodies to eliminate the position error of blade tooling, the installation error between blades and blade tooling, and the positioning error of the installation and transportation test body, remove the inherent error of the system, and improve the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0030] Figure 1 It is a schematic diagram of the arrangement of the installation platform and the static moment measuring instrument of the first embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of the connection between the installation and transportation test body and the installation platform according to the first embodiment of the present invention.

[0032] Figure 3 It is a schematic diagram of the structure of the installation and transportation test body according to the first embodiment of the present invention.

[0033] Figure 4 This is a schematic diagram of the arrangement of the installation platform, static moment measuring instrument and disassembly platform of the second embodiment of the present invention.

[0034] Figure 5 This is a schematic diagram of the installation and transportation test body of the third embodiment of the present invention being arranged above the static moment measuring instrument.

[0035] In the figure: 1. Installation and transfer test body; 11. Blade tooling; 12. Test support; 13. Balance block; 2. Installation platform; 3. Static moment measuring instrument; 4. Disassembly platform. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] Example 1

[0038] See also Figure 1-Figure 3The present invention provides a technical solution: a method for measuring the static moment of a blade, comprising the following steps: step (1) establishing a balanced installation and transportation test body 1 on a static moment measuring instrument 3, wherein the installation and transportation test body 1 has a blade fixture 11 for installing and cooperating with the blade to be measured; step (2) installing the transportation test body 1 in a stable state, and installing a blade to be measured on the blade fixture 11; step (3) installing the transportation test body 1 and cooperating with the static moment measuring instrument 3, and the static moment measuring instrument 3 measures the torque value of the blade to be measured; step (4) after the test is completed, the installation and transportation test body 1 is separated from the static moment measuring instrument 3, and the blade is taken out; step (5) repeating steps (2), (3), and (4) to measure the static moment of all blades in a group; after the static moment of all blades in a group is measured, the static moments of all blades can be sorted according to the measured torque values.

[0039] Among them, the installation and transportation test body 1 also includes a test support 12 and a balancing block 13 arranged on the test support 12, and the blade tooling 11 is also installed on the test support 12; the test support 12 can be docked with the static moment measuring instrument 3 through docking. Specifically, docking plates can be set on both the test support 12 and the static moment measuring instrument 3, and the upper and lower docking are performed through the two docking plates; by adjusting the position of the balancing block 13 fixed on the test support 12 or adjusting the weight of the balancing block 13, after the test support 12 is docked with the static moment measuring instrument 3, the test requirements under no-load and blade installation states are met, that is, the installation and transportation test body 1 can be balanced under no-load or blade installation states.

[0040] In this embodiment, the installation position of the blade tooling 11 can be determined based on the distance between the theoretical center of mass of the blade after the installation and transportation test body 1 (with blades installed) is docked with the static torque measuring instrument 3 and the test rotation center of the static torque measuring instrument 3, that is, the position of the blade is determined by determining the installation position of the blade tooling 11, and the installation and transportation test body 1 is docked with the static torque measuring instrument 3 to ensure that the distance between the theoretical center of mass of the blade after the installation and transportation test body 1 loaded with blades is docked with the static torque measuring instrument 3 and the test rotation center of the static torque measuring instrument 3 is the distance from the actual blade to the engine rotation center; in addition, the static torque measuring instrument 3 can adopt a knife-edge torque scale or a rotary torque scale and other equipment.

[0041] The blade fixture 11 is matched in a plug-in manner, and the blade to be tested can be directly plugged into the blade fixture 11 , that is, blades with complex spatial curved surfaces, mortise and tenon joints, or pin holes and other connection structures can be plugged into the blade fixture 11 .

[0042] In step (2), the installation and transportation test body 1 is docked and matched through an installation platform 2. The installation platform 2 can clamp and fix the installation and transportation test body 1. When the installation platform 2 clamps the installation and transportation test body 1, a blade to be tested is grabbed by a robotic arm and installed on the blade tooling 11; the structure of the installation platform 2 docking with the test support 12 is the same as the structure of the static moment measuring instrument 3 docking with the test support 12, that is, the installation platform 2 is also provided with a docking plate for docking with the test support 12, and the docking plate has the same structure as the docking plate on the static moment measuring instrument 3; the installation platform 2 has a clamping mechanism for clamping the installation and transportation test body 1, and the clamping mechanism adopts the existing technology and can release the clamping of the installation and transportation test body 1 at the same time.

[0043] In step (3), the mounting platform 2 releases the clamping of the installation and transportation test body 1, and the installation and transportation test body 1 is grabbed by the robotic arm. The test support 12 of the installation and transportation test body 1 can be docked on the static moment measuring instrument 3 through docking.

[0044] In step (4), after the test is completed, the transfer test body 1 is grabbed and installed by the robotic arm so that the test support 12 on which the transfer test body 1 is installed is re-docked and matched on the installation platform 2. After the transfer test body 1 is clamped and fixed by the installation platform 2, the blade can be removed from the blade tooling 11 by the robotic arm.

[0045] In this embodiment, a blade installation station 12 is provided to install the blades before measurement, thereby avoiding impact caused by installing the blades on the static moment measuring instrument 3, thereby avoiding internal forces or torques generated by the impact, and avoiding accidental errors; by docking the test support 12 with the static moment measuring instrument 3, automatic centering positioning is achieved, reducing impact vibration on the static moment measuring instrument 3, and ensuring the accuracy and repeatability of the test of the static moment measuring instrument 3.

[0046] By establishing the installation and transportation test body 1, the distance from the theoretical center of mass of the blade to the test rotation center is determined before the test state, so that the static moment can be directly measured, with high test accuracy and good work efficiency; balancing is performed on the installation and transportation test body 1 to ensure the relative balance of the installation and transportation test body 1. Within the measuring range, there is no need to adjust the static moment measuring instrument 3, and the versatility is good; the installation and transportation test body 1, the static moment measuring instrument 3, and the installation platform 2 are docked and matched to achieve standard and fast connection.

[0047] Example 2

[0048] See also Figures 1-4 This embodiment is based on the first embodiment. This embodiment replaces step (4) of the first embodiment, and the other steps remain unchanged.

[0049] The specific steps of the replacement step are as follows: After the test is completed, the installation and transfer test body 1 is grabbed by the robotic arm, so that the test support 12 of the installation and transfer test body 1 is docked and matched on the disassembly platform 4. After the installation and transfer test body 1 is clamped and fixed by the disassembly platform 4, the blade is removed from the blade tooling 11 by the robotic arm; after the blade is taken out, the installation and transfer test body 1 is transferred by the robotic arm, and the test support 12 of the installation and transfer test body 1 is re-docked and matched on the installation platform 2.

[0050] The disassembly platform 4 has the same structure as the installation platform 2 , that is, the disassembly platform 4 also has a clamping mechanism for clamping, installing and transporting the test body and a docking plate for docking with the test support 12 .

[0051] In this embodiment, a disassembly platform 4 is added, and the installation platform 2 and the disassembly platform 4 are respectively set on two workstations. When the blade is taken out on the disassembly platform 4, the installation position of the blade to be measured and the removal position of the measured blade are not in the same position, so that a more automated operation process can be achieved.

[0052] Example 3

[0053] See also Figure 3 and Figure 5 This embodiment discloses another method for measuring the static moment of a blade, comprising the following steps: step (1) establishing a balanced installation and transportation test body 1 on a static moment measuring instrument 3, wherein the installation and transportation test body 1 has a blade fixture 11 for fitting the blade to be measured; step (2) installing the transportation test body 1 in a fixed state, and installing a blade to be measured on the blade fixture 11; step (3) installing the transportation test body 1 and fitting it on the static moment measuring instrument 3, and the static moment measuring instrument 3 measures the torque value of the blade to be measured; step (4) after the test is completed, the installation and transportation test body 1 is separated from the static moment measuring instrument 3, and the blade is taken out; step (5) repeating steps (2), (3), and (4) to measure the static moment of all blades in a group; after the static moment of all blades in a group is measured, the static moments of all blades can be sorted according to the measured torque values.

[0054] The static moment measuring instrument 3 can adopt equipment such as a knife-edge moment scale or a rotary moment scale; the installation and transportation test body 1 also includes a test support 12 and a balancing block 13 arranged on the test support 12, and the blade tooling 11 is also installed on the test support 12; the test support 12 can be docked with the static moment measuring instrument 3 through a docking fit. Specifically, docking plates can be provided on both the test support 12 and the static moment measuring instrument 3, and the upper and lower docking are performed through the two docking plates; by adjusting the position of the balancing block 13 fixed on the test support 12, after the test support 12 is docked with the static moment measuring instrument 3, the installation and transportation test body 1 can be balanced in a no-load state.

[0055] Similarly, the installation position of the blade fixture 11 is determined based on the distance between the theoretical center of mass of the blade and the test rotation center after the installation and transportation test body 1 (with blades installed) is docked with the static torque measuring instrument 3. That is, the position of the blade is determined by determining the installation position of the blade fixture 11. When the installation and transportation test body 1 is docked with the static torque measuring instrument 3, it is ensured that the distance from the theoretical center of mass of the blade to the test rotation center is a determinable set value.

[0056] In this embodiment, in step (2), a lifting device is provided to support the installation and transfer test body 1, so that the installation and transfer test body 1 is set above the static moment measuring instrument 3, and the installation and transfer test body 1 is fixed by a locking device; after the installation and transfer test body 1 is fixed, the blade can be grabbed by a robotic arm and installed on the blade tooling 11; the lifting device and the locking device both adopt existing technologies and will not be repeated here.

[0057] In step (3), the fixing of the installation and transportation test body 1 is released by the locking device, and the installation and transportation test body 1 is driven down by the lifting device, so that the test support 12 of the installation and transportation test body 1 is docked and matched with the static moment measuring instrument 3.

[0058] In step (4), after the test is completed, the transfer test body 1 is lifted and installed by the lifting device, and the transfer test body 1 is reset, that is, reset to the position in step (2). After the transfer test body 1 is fixed and installed by the locking device, the blade is removed from the blade tooling 11 by the robotic arm.

[0059] In this embodiment, after the blade is clamped, the installation and transportation test body 1 can be lowered by the lifting device and cooperated with the static moment measuring instrument 3 for direct measurement; after the measurement is completed, the installation and transportation test body 1 is lifted by the lifting device, the installation and transportation test body 1 is separated from the static moment measuring instrument 3, and the installation and transportation test body 1 is fixed by the locking device, and then the blade can be taken out; therefore, there is no need to set up a separate support and fixing structure on the outside for installing or disassembling the blade, which simplifies the operation steps and improves the test efficiency.

[0060] Example 4

[0061] See also Figure 1-Figure 5 This embodiment is based on the first, second or third embodiment, and also includes preliminary preparation work when performing measurement, including the following steps: Step 1.1, establishing a product standard body that can be installed and matched with the installation and transportation test body, and the matching part of the product standard body and the blade tooling is equivalent to the matching part of the blade to be measured and the blade tooling; Step 1.2, installing the product standard body on the blade tooling 11, placing the product standard body and the installation and transportation test body 1 as a whole on the static torque measuring instrument 3, and measuring the torque value of the product standard body; and calculating the error based on the comparison of the measured torque value and the theoretical torque value of the standard body.

[0062] The various positioning surface structures of the product standard body and the blade tooling 11 are respectively consistent with the various positioning surface structures of the blade to be measured and the blade tooling 11, that is, the product standard body can be directly plugged into the blade tooling 11; the product standard sample is used to eliminate the position error of the blade tooling 11, the installation error of the blade to be measured and the blade tooling 11, and the positioning error of the installation and transportation test body 1, thereby eliminating the inherent error of the system and improving the measurement accuracy.

[0063] Based on the error calculated in step 1.2, when measuring the torque value of the blade to be measured, the error is reversely compensated to the measured torque value to improve the test accuracy.

[0064] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for measuring blade static moment, characterized in that: The steps include: (1) A test body capable of being balanced on a static moment measuring instrument is installed and transported, and the test body has a blade fixture for mounting and fitting the blade to be tested; (2) Installing the transport test body: In a stable state, install a blade to be tested on the blade fixture; (3) Install the transport test body and match it to the static moment measuring instrument, which measures the torque value of the blade to be tested; (4) After the test is completed, the transport test body is installed and separated from the static moment measuring instrument, and the blade is removed; (5) Repeat steps (2), (3), and (4) to measure the static moment of all blades in a group.

2. The method for measuring blade static moment according to claim 1, characterized in that: In step (1), the installation and transportation test body also has a test support for supporting and fixing the blade fixture and a balance block for leveling. The test support and the static moment measuring instrument are docked in a docking manner.

3. The method for measuring blade static moment according to claim 2, characterized in that: In step (1), by adjusting the weight or installation position of the balance block on the test support, after the test support is docked with the static moment measuring instrument, the test requirements under no-load and blade installation conditions are met.

4. The method for measuring blade static moment according to claim 2, characterized in that: After the installation and transportation test body loaded with blades is docked with the static torque measuring instrument, the distance between the theoretical center of mass of the blade and the test rotation center of the static torque measuring instrument is the distance from the actual blade to the engine rotation center.

5. The method for measuring blade static moment according to claim 4, characterized in that: In step (2), a test support for installing the transfer test body is docked and matched with an installation platform. The installation platform can clamp and stably install the transfer test body. When the transfer test body is installed and stable, a blade to be tested is installed on the blade tooling.

6. The method for measuring blade static moment according to claim 5, characterized in that: In step (3), the installation platform releases its grip on the installation and transportation test body, and grabs the installation and transportation test body through a robotic arm, and the test support of the installation and transportation test body is docked on the static moment measuring instrument through a docking fit.

7. The method for measuring blade static moment according to claim 6, characterized in that: In step (4), after the test is completed, the test body is grabbed and installed by the robotic arm, and the test support on which the test body is installed is re-docked and matched on the installation platform. The blade is taken out after the installation test body is clamped and fixed by the installation platform.

8. The method for measuring blade static moment according to claim 6, characterized in that: In step (4), after the test is completed, the test body is grabbed by the robotic arm and the test support for the test body is docked on the disassembly platform. The test body is clamped and fixed by the disassembly platform and the blade is taken out. After the blade is taken out, the test body is transferred and installed by the robotic arm, and the test support for installing the transfer test body is re-docked and matched on the installation platform.

9. The method for measuring blade static moment according to claim 4, characterized in that: In step (2), the transport test body is supported by a lifting device, the transport test body is arranged above the static moment measuring instrument, and the transport test body is fixed by a locking device.

10. The method for measuring blade static moment according to claim 9, characterized in that: In step (3), the fixing of the installation and transportation test body is loosened by the locking device, and the installation and transportation test body is driven down by the lifting device, so that the test support of the installation and transportation test body is docked and matched with the static moment measuring instrument; In step (4), after the test is completed, the transport test body is lifted and installed by the lifting device, and the transport test body is fixed and installed by the locking device, and then the blade is taken out.

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