A turbine blade mounting method

Abstract

The present application relates to the technical field of aero-engine, and discloses a turbine blade mounting method, comprising the following steps: S1, mounting a turbine disc to a balancing tool to balance the turbine disc, and selecting a simulation rivet; S2, mounting a blade to the turbine disc, and mounting the simulation rivet to a rivet mounting hole between the blade and the turbine disc to connect the blade and the turbine disc, forming a first turbine assembly; S3, detecting the unbalance degree of the first turbine assembly, if the unbalance amount of the first turbine assembly is within a preset tolerance range, then the unbalance degree detection of the first turbine assembly is passed, if the unbalance amount of the first turbine assembly is not within the preset tolerance range, then by adjusting the position of each blade and / or replacing the blade, the unbalance amount of the first turbine assembly is within the preset tolerance range; S4, replacing each simulation rivet with a rivet, and crimping a collar on each rivet, forming a second turbine assembly; S5, detecting the unbalance degree of the second turbine assembly.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and in particular to a method for installing turbine blades. Background Technology

[0002] The Auxiliary Power Unit (APU) is a power unit on an aircraft besides the main engines. Its function is to independently provide bleed air for air conditioning and power, while also providing compressed air to assist in engine starting. It is a crucial and indispensable system on an aircraft, and is the most complex and precise device besides the main engines. The APS5000A model APU is manufactured by PwC for the Boeing 787 aircraft. This model is specifically designed for the Boeing 787 and is larger and heavier, considered a new generation APU. The turbine, as the most important core component of the APU, is essential for its intended function. Operating at rated speeds up to 50,000 rpm, the overall imbalance of the rotor assembly is a critical indicator of APU performance. This model of APU is prone to excessive vibration failures, and turbine balance significantly impacts the overall imbalance of the rotor assembly, making turbine balance extremely important. This model of APU has a two-stage turbine: a primary turbine and a secondary turbine. The turbine's function is to generate power by burning air to power the rotor and accessory gearbox. The turbine has a complex structure and operates under complex conditions, enduring high temperature, high pressure, and high vibration. Turbine blades often need to be replaced and repaired due to ablation. This model of APU has high vibration standard requirements, and the imbalance of the turbine assembly has a direct impact on this. Therefore, the balancing of the turbine blades and turbine disk is of paramount importance. Poor matching will result in the turbine being sent back to the factory for repair due to high vibration. In order to meet the needs of large aircraft operating conditions, it is necessary to ensure that the turbine blades will not shift or cause other failures. Therefore, the connection between the turbine blades and turbine disk of this model adopts a riveting method, which is an advanced design with high riveting pressure and high riveting weight.

[0003] Due to imperfections in the maintenance manual and limitations in both hardware and software, the probability of this turbine model achieving final balancing within the preset tolerances is low. This low success rate leads to numerous rework attempts, significantly increasing the workload of turbine blade installation. The reasons for this low probability of achieving final balancing within the preset tolerances include: 1. After the turbine blades are installed on the turbine disk, the lack of rivets causes vibration within the disk, resulting in unstable imbalance and inaccurate imbalance detection results; 2. After the rivets and collar are riveted, the balance state with rivets and collar differs from the initial balance state without rivets, causing the final turbine balancing to fail.

[0004] Therefore, there is an urgent need for a turbine blade installation method to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a turbine blade installation method that increases the probability that the imbalance is within a preset tolerance when the turbine is finally balanced after the turbine rivets and collar riveting are completed, thereby reducing the workload of turbine blade installation.

[0006] To achieve the above objectives, the present invention provides a turbine blade installation method, comprising the following steps: S1. Install the turbine disk onto the balancing fixture to balance the turbine disk. Select simulated rivets. The number of simulated rivets is equal to the number of blades to be installed. Each simulated rivet has the same weight and length. An elastic top support is provided in the middle of the simulated rivet along the circumference of the simulated rivet. S2. Install the blades onto the turbine disk and install simulated rivets into the rivet mounting holes between the blades and the turbine disk to connect the blades and the turbine disk, forming the first turbine assembly. When the simulated rivets are installed into the rivet mounting holes, the elastic support portion on the simulated rivets is compressed. S3. Perform an imbalance test on the first turbine assembly. If the imbalance of the first turbine assembly is within the preset tolerance range, the imbalance test of the first turbine assembly is passed. If the imbalance of the first turbine assembly is not within the preset tolerance range, adjust the position of each blade and / or replace the blades to make the imbalance of the first turbine assembly within the preset tolerance range. S4. Replace each simulated rivet with a rivet, and press the collar onto each rivet to form the second turbine assembly; S5. Perform an imbalance test on the second turbine assembly. If the imbalance of the second turbine assembly is within the preset tolerance range, then rivet each rivet to form a turbine.

[0007] As an improvement to the above technical solution, each simulated rivet has the same length. Step S5 also includes: if the imbalance of the second turbine assembly is not within the preset tolerance range, then use a spare blade to replace the blade at the unbalanced position until the imbalance of the second turbine assembly is within the preset tolerance range.

[0008] As an improvement to the above technical solution, the unbalance includes static unbalance and dynamic unbalance.

[0009] As an improvement to the above technical solution, step M is added between steps S2 and S3: checking and adjusting the positions of both ends of the simulated rivets so that both ends of each simulated rivet are flush.

[0010] As an improvement to the above technical solution, an imbalance detection is performed on the first turbine assembly, including: A1. Install balancing fixtures on the first turbine assembly; A2. Install the first turbine assembly with the balancing fixture onto the balancing machine; A3. Use a balancing machine to test the imbalance of the first turbine assembly.

[0011] As an improvement to the above technical solution, if the imbalance of the first turbine assembly is not within the preset tolerance range, the imbalance of the first turbine assembly is brought within the preset tolerance range by adjusting the position of each blade and / or replacing the blades, including: If the static imbalance of the first turbine assembly is not within the preset tolerance range, adjust the position of each blade and / or replace the blades until the static imbalance of the first turbine assembly is within the preset tolerance range. If the static imbalance of the first turbine assembly is within the preset tolerance range, but the dynamic imbalance is not within the preset tolerance range, then a spare blade with the same weight as the blade at the unbalanced position is used to replace the blade at the unbalanced position until the dynamic imbalance of the first turbine assembly is within the preset tolerance range.

[0012] As an improvement to the above technical solution, if the imbalance of the second turbine assembly is not within the preset tolerance range, a spare blade is used to replace the blade at the unbalanced position until the imbalance of the second turbine assembly is within the preset tolerance range, including: If the static imbalance of the second turbine assembly is not within the preset tolerance range, a spare blade with a different weight from the blade at the unbalanced position is used to replace the blade at the unbalanced position until the static imbalance of the second turbine assembly is within the preset tolerance range. If the static imbalance of the second turbine assembly is within the preset tolerance range, but the dynamic imbalance is not within the preset tolerance range, then a spare blade with the same weight as the blade at the unbalanced position is used to replace the blade at the unbalanced position until the dynamic imbalance of the second turbine assembly is within the preset tolerance range.

[0013] As an improvement to the above technical solution, replacing each simulated rivet with a rivet specifically includes: using a rivet to push out the simulated rivet, and then removing the simulated rivet.

[0014] As an improvement to the above technical solution, step S5 is followed by step S6, which involves detecting the imbalance of the turbine. If the imbalance of the turbine is within the preset tolerance range, the turbine blade replacement is completed.

[0015] As an improvement to the above technical solution, step S6 also includes: if the imbalance of the turbine is not within the preset tolerance range, then remove the rivets and collar, and then repeat steps S1-S6.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The turbine blade installation method of the present invention uses simulated rivets to connect each blade to the turbine disk (i.e., the first turbine assembly) before performing imbalance testing on the turbine disk with the blades installed. This increases the stability of the relative position between each blade and the turbine disk, reduces the vibration of each blade relative to the turbine disk during the imbalance testing of the first turbine assembly, and ensures accurate results for the imbalance testing of the first turbine assembly. Since each simulated rivet has the same length and weight, its influence on the imbalance of the first turbine assembly can be minimized. Improving the probability of passing the imbalance test of the subsequent second turbine assembly by performing imbalance testing and adjustment on the first turbine assembly effectively increases the probability of passing the imbalance test. Furthermore, since the simulated rivets rely on the elastic deformation of the elastic support portion to support the blades and turbine disk, their disassembly is more convenient, resulting in minimal disassembly work on the blades of the first turbine assembly. Therefore, using simulated rivets to assemble the first turbine assembly and then testing and adjusting it effectively reduces the overall workload of turbine blade installation. Furthermore, after the collar is crimped onto the rivet, the turbine disk (i.e., the second turbine assembly) with blades, rivets, and collar installed is subjected to an imbalance test to verify whether the imbalance of the second turbine assembly meets the requirements. This reduces the probability that the turbine imbalance will not meet the requirements after the rivet is crimped, thereby improving the blade installation efficiency and reducing the workload of turbine blade installation. Attached Figure Description

[0017] Figure 1 This is a flowchart of the turbine blade installation method provided in the embodiments of the present invention; Figure 2 This is a schematic diagram of the turbine disk, blades, and simulated rivets provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the turbine disk, blades, rivets, and collar provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a simulated rivet provided in an embodiment of the present invention.

[0018] In the picture: 1. Turbine disk; 2. Blade; 3. Simulated rivet; 4. Rivet; 5. Collar; 10. Rivet mounting holes; 20. Blade mounting slots. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0023] like Figure 1 As shown, this embodiment provides a turbine blade installation method for the initial installation of turbine blade 2 of APS5000A model APU or for the maintenance and replacement of turbine blade 2, including the following steps: S1. Install the turbine disk 1 onto the balancing fixture and balance the turbine disk 1. The specific balancing method is a conventional technique in this field and will not be described in detail here. Select simulated rivets 3 according to the number of blades 2 to be installed on the turbine disk 1. The number of simulated rivets 3 is equal to the number of blades 2 to be installed. Each simulated rivet 3 has the same weight (mass) and the same length. An elastic top support is provided in the middle of the length direction of the simulated rivet 3, which surrounds the simulated rivet 3 circumferentially. The structure of the turbine disk 1, blades 2 and simulated rivets 3 is as follows. Figure 2 As shown; S2. Install blades 2 onto turbine disk 1 and install simulated rivets 3 into rivet mounting holes 10 between blades 2 and turbine disk 1 to connect blades 2 and turbine disk 1, forming a first turbine assembly. When simulated rivets 3 are installed into rivet mounting holes 10, the elastic support portion on simulated rivets 3 is compressed. That is to say, after simulated rivets 3 are installed into rivet mounting holes 10, the elastic restoring force generated by the elastic deformation of the elastic support portion of simulated rivets 3 acts on blades 2, causing blades 2 to fit tightly against the groove wall of blade mounting slot 20 on turbine disk 1, thereby improving the stability of the relative position between each blade 2 and turbine disk 1. S3. Perform an imbalance test on the first turbine assembly. If the imbalance of the first turbine assembly is within the preset tolerance range, the imbalance test of the first turbine assembly is passed. If the imbalance of the first turbine assembly is not within the preset tolerance range, adjust the position of each blade 2 and / or replace the blade 2 to make the imbalance of the first turbine assembly within the preset tolerance range. S4. Replace each simulated rivet 3 with rivet 4, and press collar 5 onto each rivet 4 to form the second turbine assembly. The structure of rivet 4 and collar 5 is as follows: Figure 3 As shown; S5. Perform an imbalance test on the second turbine assembly. If the imbalance of the second turbine assembly is within the preset tolerance range, then rivet each of the rivets 4 is riveted to form a turbine.

[0024] The turbine blade installation method provided in this embodiment uses simulated rivets 3 to connect each blade 2 to the turbine disk 1 (i.e., the first turbine assembly) before performing imbalance testing on the turbine disk 1 on which the blades 2 are installed. This increases the stability of the relative position between each blade 2 and the turbine disk 1, reduces the vibration of each blade 2 relative to the turbine disk 1 during the imbalance testing of the first turbine assembly, and ensures that the imbalance testing of the first turbine assembly yields accurate results. Furthermore, each simulated rivet 3 has the same length and weight, which minimizes the impact of the simulated rivets 3 on the imbalance of the first turbine assembly. By performing imbalance detection and adjustment on the first turbine assembly, the probability of passing the imbalance detection of the subsequent second turbine assembly can be effectively increased. Furthermore, since the simulated rivet 3 relies on the elastic deformation of the elastic support part to support the blade 2 and the turbine disk 1, the disassembly and installation of the simulated rivet 3 are more convenient, making the disassembly workload of the blade 2 on the first turbine assembly very small. As those skilled in the art can understand, the workload of installing and disassembling the simulated rivet 3 is far less than the workload of pressing the collar 5 onto the rivet 3 and disassembling the collar 5 from the rivet 3. Therefore, using the simulated rivet 3 to assemble the first turbine assembly, and by performing imbalance detection and adjustment on the first turbine assembly, can effectively increase the probability of passing the imbalance detection of the subsequent second turbine assembly, and can effectively reduce the overall workload of turbine blade installation. After the collar 5 is pressed onto the rivet 4, an imbalance test is performed on the turbine disk 1 (i.e., the second turbine assembly) with the blade 2, rivet 4, and collar 5 installed. This verifies whether the imbalance of the second turbine assembly meets the requirements, reducing the probability that the turbine imbalance will not meet the requirements after the rivet 4 is riveted, thereby improving the installation efficiency of the blade 2 and reducing the workload of installing the turbine blade 2. Those skilled in the art will understand that when the collar 5 is pressed onto the rivet 4 but the rivet 4 has not yet been riveted, the workload required to disassemble the rivet 4 and collar 5 is much less than the workload required to disassemble the rivet 4 and collar 5 after the rivet 4 is riveted. Therefore, adding an imbalance test when the collar 5 is pressed onto the rivet 4 but the rivet 4 has not yet been riveted can effectively reduce the expected overall workload of installing the turbine blade 2.

[0025] Optionally, the imbalance in this embodiment includes both static and dynamic imbalance. The APS5000A turbine requires both static and dynamic balance; therefore, the imbalance in this embodiment includes both static and dynamic imbalance to meet the needs of blade 2 installation and replacement for the APS5000A turbine. Those skilled in the art will understand that the preset tolerance range includes a first preset tolerance range corresponding to the static imbalance and a second preset tolerance range corresponding to the dynamic imbalance.

[0026] Preferably, the simulated rivet 3 has the same weight and length as the rivet 4, in order to further increase the probability that the imbalance is within the preset tolerance range during the subsequent second turbine assembly imbalance test.

[0027] like Figure 2 and Figure 4 As shown, in this embodiment, the simulated rivet 3 includes a support rod 31 and multiple spring pieces 32. The support rod 31 has a receiving groove, and the multiple spring pieces 32 are all disposed within the receiving groove and surround the support rod 31 circumferentially. The first and second ends of the spring pieces 32 along the length of the support rod 31 are fixedly connected to the support rod 31 to prevent the support rod 31 from moving relative to the spring pieces 32 when the simulated rivet 3 is installed in the rivet mounting hole 10. The spring pieces 32 bulge outwards from the middle of the support rod 31 along its length, away from the axis of the support rod 31, forming an elastic support portion. The elastic support portions of each spring piece 32 on the simulated rivet 3 constitute the elastic support portion of the simulated rivet 3. Preferably, the first ends of two adjacent spring pieces 32 are fixedly connected, and the second ends of two adjacent spring pieces 32 are also fixedly connected, further improving the overall stability of the simulated rivet 3 structure when it is installed in the rivet mounting hole 10. In other embodiments, other types of elastic rivets may be used, as long as they can effectively press the blade 2 against the wall of the blade mounting groove 20 through elastic force.

[0028] Optionally, step S5 further includes: if the imbalance of the second turbine assembly is not within the preset tolerance range, then a spare blade is used to replace the blade 2 at the unbalanced position until the imbalance of the second turbine assembly is within the preset tolerance range. After the collar 5 is pressed onto the rivet 4, the workload required to disassemble the blade 2 is greater than the workload required to disassemble the blade 2 when connecting the impeller and turbine disk 1 using the simulated rivet 3. Therefore, when the imbalance of the second turbine assembly does not meet the requirements (the imbalance is not within the preset tolerance range), a spare blade is used to replace the blade 2 at the unbalanced position to reduce the number of blades 2 to be disassembled, thereby reducing the workload. Those skilled in the art will understand that since the balancing machine can display the angle of the unbalanced position, both dynamic balancing and static balancing can display the unbalanced angle. Based on the unbalanced angle, the blade 2 at the corresponding position can be found, which is the blade 2 at the unbalanced position mentioned in this embodiment.

[0029] Optionally, each simulated rivet 3 has the same length. Step M is also included between steps S2 and S3, which involves checking and adjusting the positions of both ends of the simulated rivets 3 so that both ends of each simulated rivet 3 are aligned, thus avoiding the impact of different lengths and positions of the simulated rivets 3 on the imbalance of the first turbine assembly.

[0030] Optionally, an imbalance detection is performed on the first turbine assembly, including: A1. Install balancing fixtures on the first turbine assembly; A2. Install the first turbine assembly with the balancing fixture onto the balancing machine; A3. Use a balancing machine to detect the imbalance of the first turbine assembly. Using balancing fixtures and a balancing machine to detect the imbalance of the turbine assembly is existing technology in this field, and will not be described in detail in this embodiment.

[0031] Optionally, step S3 further includes: if the imbalance detection of the first turbine assembly passes, removing the first turbine assembly with the balancing fixture installed from the balancing machine, and then removing the balancing fixture.

[0032] Optionally, before step S1, step N is also included: weighing each blade 2 in a set of blades 2 to be installed, sorting them according to their weight, marking them with serial numbers, preparing several spare blades, preparing several spare blades for each weight of blade 2, and marking the spare blades with serial numbers according to their weight. Blades 2 of the same weight and spare blades have the same serial number, which makes it easy to select spare blades to replace the blades 2 on the turbine disk 1 according to their weight.

[0033] Optionally, if the imbalance of the first turbine assembly is not within the preset tolerance range, the imbalance of the first turbine assembly is brought within the preset tolerance range by adjusting the position of each blade 2 and / or replacing the blade 2, including: If the static imbalance of the first turbine assembly is not within the preset tolerance range, the position of each blade 2 is adjusted and / or the blade 2 is replaced until the static imbalance of the first turbine assembly is within the preset tolerance range. Specifically, the position of each blade 2 is adjusted according to the weight of each blade 2 on the turbine disk 1 and the static imbalance, or some blades 2 on the turbine disk 1 are replaced with spare blades according to the weight of each blade 2 on the turbine disk 1 and the static imbalance, until the static imbalance of the first turbine assembly is within the preset tolerance range. If the static imbalance of the first turbine assembly is within the preset tolerance range, but the dynamic imbalance is not, then a spare blade of the same weight as the blade 2 at the unbalanced position is used to replace the blade 2 at the unbalanced position until the dynamic imbalance of the first turbine assembly is within the preset tolerance range. Replacing the blade 2 at the unbalanced position with a spare blade of the same weight as the blade 2 at the unbalanced position can adjust the dynamic imbalance of the first turbine assembly while keeping the static imbalance within the preset tolerance range, so that the dynamic imbalance of the first turbine assembly meets the requirements. This adjustment method can effectively reduce the workload of adjusting the blade 2 of the first turbine assembly. Those skilled in the art will understand that replacing the blade 2 of the same weight will not affect the static imbalance, but since the center of gravity of the blade 2 of the same weight will be different, replacing and adjusting the blade 2 of the same weight can achieve the adjustment of the dynamic imbalance.

[0034] Optionally, an imbalance detection is performed on the second turbine assembly, including: B1. Install balancing fixtures on the second turbine assembly; B2. Install the second turbine assembly with the balancing fixture onto the balancing machine; B3. Use a balancing machine to detect the imbalance of the second turbine assembly. Using balancing fixtures and a balancing machine to detect the imbalance of the turbine assembly is prior art in this embodiment, and will not be described in detail here.

[0035] Optionally, if the imbalance of the second turbine assembly is within a preset tolerance range, then each rivet 4 is riveted to form a turbine, including: If the imbalance of the second turbine assembly is within the preset tolerance range, the imbalance test of the second turbine assembly is passed; if the imbalance test of the second turbine assembly is passed, the second turbine assembly with the balancing fixture installed is removed from the balancing machine, and then the balancing fixture is removed, and the older rivet 4 on the second turbine assembly is riveted.

[0036] Optionally, if the imbalance of the second turbine assembly is not within the preset tolerance range, a spare blade is used to replace the blade 2 at the unbalanced position until the imbalance of the second turbine assembly is within the preset tolerance range, including: If the static imbalance of the second turbine assembly is not within the preset tolerance range, a spare blade with a different weight from the blade 2 at the unbalanced position is used to replace the blade 2 at the unbalanced position until the static imbalance of the second turbine assembly is within the preset tolerance range. Specifically, based on the weight of each blade 2 on the turbine disk 1 and the static imbalance, spare blades are used to replace some blades 2 on the turbine disk 1 until the static imbalance of the first turbine assembly is within the preset tolerance range. Compared to replacing the position of each blade 2, directly using spare blades to replace the blade 2 at the unbalanced position can reduce the number of times the blade 2 is disassembled. For the second turbine assembly that has been crimped with the collar 5, the blade 2 is relatively difficult to disassemble, and reducing the number of times the blade 2 is disassembled can significantly reduce the workload. If the static imbalance of the second turbine assembly is within the preset tolerance range, but the dynamic imbalance is not, then a spare blade of the same weight as the blade 2 at the unbalanced position is used to replace the blade 2 at the unbalanced position until the dynamic imbalance of the second turbine assembly is within the preset tolerance range. Replacing the blade 2 at the unbalanced position with a spare blade of the same weight as the blade 2 at the unbalanced position can adjust the dynamic imbalance of the second turbine assembly while keeping the static imbalance of the second turbine assembly within the preset tolerance range, so that the dynamic imbalance of the second turbine assembly meets the requirements. This adjustment method can effectively reduce the workload of adjusting the blade 2 of the second turbine assembly.

[0037] Optionally, replacing each simulated rivet 3 with a rivet 4 specifically includes: using the rivet 4 to push out the simulated rivet 3, then removing the simulated rivet 3, and then continuing to insert the rivet 4 until the rivet 4 is fully inserted. Those skilled in the art will understand that since only elastic deformation occurs during the installation process of the simulated rivet 3, the simulated rivet 3 can be pushed out relatively easily by the rivet 4, and the removed simulated rivet 3 can be reused later.

[0038] Optionally, step S5 is followed by step S6, which involves checking the turbine's imbalance. If the turbine's imbalance is within the preset tolerance range, the turbine blade 2 replacement is complete. After the rivets 4 are riveted, the turbine's imbalance is checked again to ensure that the turbine's imbalance meets the requirements at the factory.

[0039] Furthermore, step S6 also includes: if the imbalance of the turbine is not within the preset tolerance range, then remove the rivet 4 and collar 5, and then repeat steps S1-S6.

[0040] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A method for installing turbine blades, characterized in that, Includes the following steps: S1. Install the turbine disk (1) onto the balancing fixture to balance the turbine disk (1), select simulated rivets (3), and the number of simulated rivets (3) is equal to the number of blades (2) to be installed. Each simulated rivet (3) has the same weight and the same length. An elastic top support is provided in the middle of the length direction of the simulated rivet (3) to surround the simulated rivet (3) in the circumferential direction. S2. Install the blade (2) onto the turbine disk (1) and install the simulated rivet (3) into the rivet mounting hole (10) between the blade (2) and the turbine disk (1) to connect the blade (2) and the turbine disk (1) to form the first turbine assembly. When the simulated rivet (3) is installed into the rivet mounting hole (10), the elastic top support on the simulated rivet (3) is compressed. S3. Perform an imbalance test on the first turbine assembly. If the imbalance of the first turbine assembly is within the preset tolerance range, the imbalance test of the first turbine assembly is passed. If the imbalance of the first turbine assembly is not within the preset tolerance range, adjust the position of each blade (2) and / or replace the blade (2) to make the imbalance of the first turbine assembly within the preset tolerance range. S4. Replace each simulated rivet (3) with rivets (4) and press collars (5) onto each rivet (4) to form a second turbine assembly; S5. Perform an imbalance test on the second turbine assembly. If the imbalance of the second turbine assembly is within the preset tolerance range, then rivet each rivet (4) to form a turbine.

2. The turbine blade installation method according to claim 1, characterized in that, Each simulated rivet (3) has the same length. Step S5 also includes: if the imbalance of the second turbine assembly is not within the preset tolerance range, then use a spare blade to replace the blade (2) at the unbalanced position until the imbalance of the second turbine assembly is within the preset tolerance range.

3. The turbine blade installation method according to claim 2, characterized in that, Unbalance includes static unbalance and dynamic unbalance.

4. The turbine blade installation method according to claim 3, characterized in that, Between steps S2 and S3, there is also step M, checking and adjusting the positions of both ends of the simulated rivets (3) so that both ends of each simulated rivet (3) are flush.

5. The turbine blade installation method according to claim 3, characterized in that, Imbalance testing of the first turbine assembly includes: A1. Install balancing fixtures on the first turbine assembly; A2. Install the first turbine assembly with the balancing fixture onto the balancing machine; A3. Use a balancing machine to test the imbalance of the first turbine assembly.

6. The turbine blade installation method according to claim 5, characterized in that, If the imbalance of the first turbine assembly is not within the preset tolerance range, the imbalance of the first turbine assembly is brought within the preset tolerance range by adjusting the position of each blade (2) and / or replacing the blades (2), including: If the static imbalance of the first turbine assembly is not within the preset tolerance range, adjust the position of each blade (2) and / or replace the blade (2) until the static imbalance of the first turbine assembly is within the preset tolerance range. If the static imbalance of the first turbine assembly is within the preset tolerance range, but the dynamic imbalance is not within the preset tolerance range, then a spare blade with the same weight as the blade (2) at the unbalanced position is used to replace the blade (2) at the unbalanced position until the dynamic imbalance of the first turbine assembly is within the preset tolerance range.

7. The turbine blade installation method according to claim 3, characterized in that, If the imbalance of the second turbine assembly is not within the preset tolerance range, the blade at the unbalanced position is replaced with a spare blade (2) until the imbalance of the second turbine assembly is within the preset tolerance range, including: If the static imbalance of the second turbine assembly is not within the preset tolerance range, a spare blade with a different weight than the blade (2) at the unbalanced position is used to replace the blade (2) at the unbalanced position until the static imbalance of the second turbine assembly is within the preset tolerance range. If the static imbalance of the second turbine assembly is within the preset tolerance range, but the dynamic imbalance is not within the preset tolerance range, then a spare blade of the same weight as the blade (2) at the unbalanced position is used to replace the blade (2) at the unbalanced position until the dynamic imbalance of the second turbine assembly is within the preset tolerance range.

8. The turbine blade installation method according to claim 1, characterized in that, Replacing each simulated rivet (3) with a rivet (4) specifically includes: using the rivet (4) to push out the simulated rivet (3) and then removing the simulated rivet (3).

9. The turbine blade installation method according to any one of claims 1-8, characterized in that, Step S5 is followed by step S6, which involves testing the turbine for imbalance. If the turbine imbalance is within the preset tolerance range, the turbine blades (2) are replaced.

10. The turbine blade installation method according to claim 9, characterized in that, Step S6 also includes: if the turbine imbalance is not within the preset tolerance range, then remove the rivet (4) and collar (5), and then repeat steps S1-S6.

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