Method for assembling power turbine of aero-engine

Abstract

The invention discloses an aero-engine power turbine assembly method, which belongs to the technical field of aero-engine power turbine assembly, and comprises the following steps: S100, placing a power turbine on a turnover assembly of an aero-engine power turbine assembly vehicle with a shaft tail facing downwards; s200, the power turbine case is installed on an overturning assembly of the assembly vehicle, and the power turbine case and the power turbine are made to be coaxial; s300, the power turbine is moved upwards in the axial direction, so that the power turbine reaches the preset mounting position; s400, the power turbine is rotated and adjusted, so that blades on the power turbine are matched with blades in a power turbine case; s500, the power turbine case and the power turbine are locked, the power turbine and the power turbine case are made to synchronously rotate by 180 degrees by rotating an overturning assembly, and the shaft tail of the power turbine faces upwards; and S600, the axial distance between the end face of the power turbine case and the power turbine blade is measured, and if the measurement result meets the assembly standard, assembly is completed. The method has the advantage that the assembling efficiency of the power turbine is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft engine power turbine assembly, in particular to an aircraft engine power turbine assembly method. Background Art

[0002] The power turbine of an aircraft engine is an important component inside the aircraft engine. Its main function is to convert the energy of the high-temperature and high-pressure gas generated by combustion into mechanical energy. The power turbine receives high-speed and high-temperature airflow from the gas turbine and converts the energy of the airflow into rotational mechanical energy through the rotation of the turbine blades.

[0003] The power turbine consists of a body, blades, and a long axis as a whole. The power turbine is required to rise vertically from the inside of the lower part of the power turbine casing to assemble with the blades in the power turbine casing. The assembly dimensions require a vertical spacing dimension of 180±0.1 mm. Since the assembly process requires the blades on the power turbine to be matched with the blades in the casing, and the assembly of the two blades is directional, the power turbine is required to be assembled only vertically on the inside of the lower casing, and the assembly process needs to have a self-rotation adjustment function around the long axis. Therefore, it is also necessary to position the assembled power turbine and casing as a whole, then flip the whole 180°, and then measure the vertical spacing dimension of 180±0.1 mm using a measuring tool. Since the power turbine assembly is 1.1 meters long, it is slender and needs to be flipped 180° to measure the assembly dimensions in the vertical direction, which requires the cooperation of multiple people and the assistance of a hanging device, and the assembly efficiency is low. Summary of the invention

[0004] The invention provides an aero-engine power turbine assembly method to solve the technical problem of low power turbine assembly efficiency.

[0005] According to one aspect of the present invention, there is provided an aircraft engine power turbine assembly method, comprising step S100, placing the power turbine shaft tail downward on a flip assembly of an aircraft engine power turbine assembly vehicle;

[0006] S200, install the power turbine casing on the flip assembly of the assembly vehicle so that the power turbine casing and the power turbine are coaxial;

[0007] S300, moving the power turbine axially upward to make the power turbine reach a preset installation position;

[0008] S400, rotating and adjusting the power turbine so that the blades on the power turbine are matched with the blades in the power turbine casing;

[0009] S500, lock the power turbine casing and the power turbine, and rotate the power turbine and the power turbine casing synchronously by 180° by rotating the flip assembly, with the tail of the power turbine shaft facing upward;

[0010] S600, measure the axial distance between the end face of the power turbine casing and the power turbine blades. If the measurement result meets the assembly standard, the assembly is completed.

[0011] Optionally, in step S100, a shaft tail positioning assembly is used to cooperate with the shaft tail of the power turbine to limit the rotation of the power turbine; in step S300, after the power turbine moves upward to a preset installation position, the shaft tail is disengaged from the shaft tail positioning assembly.

[0012] Optionally, the flip assembly includes a power turbine casing clamping assembly and a power turbine supporting assembly, wherein the power turbine casing clamping assembly is used to clamp and fix the power turbine casing, and the power turbine supporting assembly is used to support the power turbine body and drive the power turbine body to translate axially and rotate circumferentially.

[0013] Optionally, the power turbine casing clamping assembly includes a pressure plate, an upper positioning plate and a pull rod; in step S200, the power turbine casing is installed on the flip assembly of the assembly vehicle, and the power turbine casing and the power turbine are made coaxial in the following manner: the power turbine casing is placed on the upper positioning plate, and the upper positioning plate is provided with corresponding positioning grooves, so that the power turbine casing and the power turbine are made coaxial; in step S500, the power turbine casing is locked in the following manner: a pressure plate is installed on the power turbine casing, and the pressure plate and the upper positioning plate are tightened by multiple pull rods arranged along the axial direction, so that the upper positioning plate and the pressure plate clamp the power turbine casing.

[0014] Optionally, the power turbine support assembly includes a lower positioning plate connected to the upper positioning plate, a fixed sleeve arranged on the lower positioning plate, an adjusting sleeve threadedly connected to the fixed sleeve, and a movable sleeve fixedly connected to the power turbine, the movable sleeve being movably inserted into the fixed sleeve, the movable sleeve and the adjusting sleeve being both sleeved on the shaft of the power turbine, and the adjusting sleeve being located below the movable sleeve to support the movable sleeve; the method for moving the power turbine axially upward in step S300 so that the power turbine reaches a preset installation position is as follows: rotating the adjusting sleeve, driving the adjusting sleeve to move upward through the threaded cooperation of the adjusting sleeve and the fixed sleeve, the adjusting sleeve pushing the movable sleeve to move upward, and thereby moving the power turbine upward.

[0015] Optionally, the method of rotating and adjusting the power turbine in step S400 is: manually rotating the movable sleeve rod, thereby driving the power turbine to rotate.

[0016] Optionally, a locking bolt for locking the movement of the movable sleeve rod is provided on the fixed sleeve; the method of locking the power turbine in step S500 is: rotating the locking bolt so that the end of the locking bolt presses the movable sleeve rod, and the movement of the movable sleeve rod is limited by the friction between the locking bolt and the surface of the movable sleeve rod.

[0017] Optionally, the assembly vehicle is provided with a flip driving source for driving the flip assembly to rotate, the flip driving source includes a support provided on the frame and a reducer provided on the support, the input end of the reducer is connected to a handle, and the output end of the reducer is connected to the left rotating shaft or the right rotating shaft in a transmission manner; the method of rotating the flip assembly in step S500 is: rotating the handle, transmitting and reducing speed through the reducer, and then driving the flip assembly to rotate at a speed lower than the handle rotation speed.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] The power turbine shaft is placed with the tail facing downward on the flip assembly of the assembly vehicle so that it is in the initial stable assembly position, thus avoiding the complexity of manual handling; the power turbine casing is coaxially installed with the power turbine, and the casing clamping assembly is precisely positioned to ensure that the casing and the power turbine are not misaligned during the assembly process, thereby avoiding the time-consuming repeated adjustment; the power turbine rises smoothly along the axial direction to reach the preset installation position, and the up and down adjustment function of the adjustment sleeve is used to ensure that the assembly process is accurate and correct, reduce human errors, and avoid multiple debugging; the power turbine is adjusted by self-rotation to make the blades accurately match the blades in the casing, ensure the directionality of the assembly, and avoid the complex operation of manual matching; the power turbine and the casing are synchronously flipped 180° after locking, and the design of the flip assembly makes this process smooth and fast, reducing the time-consuming and labor-intensive operation of manual flipping; the assembly accuracy is confirmed by measurement, and the use of the measuring tool is optimized by using the measurement position after flipping, reducing the need for multiple adjustments, thereby improving the overall assembly efficiency. Through these steps, the method greatly reduces the complexity and time consumption of human operation, and realizes a more efficient and accurate assembly process.

[0020] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 A front view of a vehicle assembling a power turbine for an aircraft engine;

[0023] Figure 2 A cross-sectional view of an aircraft engine power turbine assembly vehicle.

[0024] Legend:

[0025] 1. Car body; 2. Car frame; 3. Flip assembly; 4. Car pusher; 5. Brake universal wheel; 6. Car pusher socket; 7. Pressure plate; 8. Pull rod; 9. Moving sleeve rod; 10. Fixed sleeve; 11. Upper positioning plate; 12. Fastening bolt; 13. Thrust ball bearing; 14. Left shaft; 15. Left bushing; 16. Right shaft; 17. Right bushing; 18. Lower positioning; 19. Adjusting sleeve rod; 20. Handle; 21. Handle; 22. Reducer; 23. Support; 24. Positioning base; 25. Spline sleeve. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0027] The following is combined with Figure 1-2 This application is described in further detail.

[0028] The embodiment of the present application discloses a method for assembling a power turbine of an aircraft engine.

[0029] Reference Figure 1 and Figure 2 The aircraft engine power turbine assembly method is completed using an aircraft engine power turbine assembly vehicle. The aircraft engine power turbine assembly vehicle includes a vehicle body 1, a frame 2 and a flip assembly 3. The vehicle body 1 can move by self-drive or external force; the frame 2 is arranged on the vehicle body 1 to provide a support platform; the flip assembly 3 is installed on the frame 2 and rotates with the frame 2. A flip driving source for driving the flip assembly 3 to rotate is arranged on the frame 2. The rotation center line of the flip assembly 3 is perpendicular to the axis of the power turbine; the flip assembly 3 includes a power turbine casing clamping assembly and a power turbine support assembly. The power turbine casing clamping assembly is used to clamp and fix the power turbine casing, and the power turbine support assembly is used to support the power turbine body and drive the power turbine body to translate axially and rotate circumferentially.

[0030] The assembly vehicle can move freely through the self-drive of the vehicle body 1 or external force, and the frame 2 provides a stable support platform for the entire assembly process. The flip assembly 3 is installed on the frame 2 and cooperates with the rotation thereof to make the flipping action more stable and precise. The flip driving source is responsible for driving the rotation of the flip assembly 3 to ensure that the rotation center line of the flip assembly 3 is perpendicular to the axis of the power turbine, thereby ensuring the alignment accuracy during assembly; the power turbine casing clamping assembly in the flip assembly 3 is used to firmly fix the power turbine casing to prevent displacement during flipping or movement, and the power turbine support assembly supports and adjusts the axial translation and circumferential rotation of the power turbine body, thereby making the assembly process more precise and ensuring the pairing and assembly accuracy of the power turbine and the casing, thereby effectively improving the efficiency and accuracy of the entire assembly process.

[0031] The power turbine casing clamping assembly includes a pressure plate 7, an upper positioning plate 11 and a pull rod 8. The pressure plate 7 is arranged on the upper surface of the power turbine casing, the upper positioning plate 11 is arranged on the lower surface of the power turbine casing, and the pull rod 8 connects and tightens the upper positioning plate 11 and the pressure plate 7 to clamp the power turbine casing. The pressure plate 7 is arranged on the upper surface of the power turbine casing, the upper positioning plate 11 is arranged on the lower surface of the casing, the pull rod 8 connects the upper positioning plate 11 and the pressure plate 7, and by tightening the pull rod 8, the upper and lower positioning plates 18 and the pressure plate 7 clamp the casing at the same time, thereby ensuring that the casing remains stable and motionless during the assembly process, which can prevent the casing from being misplaced or moved, ensure accurate alignment with the power turbine, and ensure the accuracy and stability of the entire assembly process. Specifically, one end of the pull rod 8 is threadedly matched with the upper positioning plate 11, and the other end of the pull rod 8 passes through the pressure plate 7 and is threadedly connected with a nut.

[0032] The power turbine support assembly includes a lower positioning plate 18 connected to an upper positioning plate 11, a fixed sleeve 10 disposed on the lower positioning plate 18, an adjusting sleeve rod 19 threadedly connected to the fixed sleeve 10, and a movable sleeve rod 9 fixedly connected to the power turbine, wherein the movable sleeve rod 9 is movably inserted into the fixed sleeve 10, and both the movable sleeve rod 9 and the adjusting sleeve rod 19 are sleeved on the shaft of the power turbine, and the adjusting sleeve rod 19 is located below the movable sleeve rod 9 to support the movable sleeve rod 9. The lower positioning plate 18 provides a stable support platform by being connected to the upper positioning plate 11, the fixed sleeve 10 is mounted on the lower positioning plate 18, and the adjusting sleeve rod 19 threadedly connected thereto can adjust the up and down displacement of the power turbine by rotation, and the movable sleeve rod 9 is fixedly connected to the power turbine and movably passes through the fixed sleeve 10, allowing the power turbine to move or rotate axially when necessary. The adjusting sleeve rod 19 is located below the movable sleeve rod 9 and is used to support and adjust the height of the movable sleeve rod 9. Through the threaded drive system, the operator can accurately control the up and down movement and rotation of the power turbine, thereby achieving accurate positioning and assembly of the turbine in the casing.

[0033] The fixed sleeve 10 is provided with a set bolt 12 for locking the movement of the movable sleeve 9. The set bolt 12 is threadedly matched with the fixed sleeve 10, and the end of the set bolt 12 passes through the fixed sleeve 10 and is pressed against the outer wall of the movable sleeve 9. The set bolt 12 is threadedly matched with the fixed sleeve 10. When the operator rotates the set bolt 12, the end of the bolt will pass through the fixed sleeve 10 and press against the outer wall of the movable sleeve 9. The friction between the bolt and the sleeve is used to fix the movable sleeve 9 so that it remains stationary during the assembly process. This design ensures that when the position needs to be precisely fixed, the power turbine will not deviate in position due to external force or operation, thereby maintaining the stability and accuracy of the assembly.

[0034] A thrust ball bearing 13 is provided between the movable sleeve rod 9 and the adjustment sleeve rod 19. The thrust ball bearing 13 is provided between the movable sleeve rod 9 and the adjustment sleeve rod 19 to reduce the friction between the sleeve rods during the assembly process of the power turbine, so that the movable sleeve rod 9 can be more smoothly translated or rotated along the axial direction while maintaining high stability and precision. The thrust ball bearing 13 is designed to withstand axial loads and allow rotation, which makes the movement of the movable sleeve rod 9 easier and more accurate when the adjustment sleeve rod 19 drives the movable sleeve rod 9 to rise or fall or rotate, reducing the influence of mechanical friction on assembly precision.

[0035] The flip assembly 3 also includes a rocker arm arranged between the upper positioning plate 11 and the lower positioning plate 18, and a left shaft 14 and a right shaft 16 are symmetrically arranged on the rocker arm. A left shaft sleeve 15 cooperating with the left shaft 14 and a right shaft sleeve 17 cooperating with the right shaft 16 are arranged on the frame 2. Through the design of the rocker arm, the left shaft 14 and the right shaft 16, the flip assembly 3 can achieve a stable and symmetrical 180° flip. The rocker arm is connected between the upper positioning plate 11 and the lower positioning plate 18, and plays a role in supporting and transmitting force. The left shaft 14 and the right shaft 16 are symmetrically arranged, respectively cooperating with the left shaft sleeve 15 and the right shaft sleeve 17 on the frame 2, forming the rotation axis of the power turbine flip. This design ensures balance and accuracy during flipping, can effectively withstand the force generated during flipping, avoid shaking or instability during flipping, and ensure that the flip assembly process of the power turbine and the casing is stable and smooth.

[0036] The flip driving source includes a support 23 arranged on the frame 2 and a reducer 22 arranged on the support 23, the input end of the reducer 22 is connected with a handle 21, and the output end of the reducer 22 is connected to the left shaft 14 or the right shaft 16. The function of the reducer 22 is to reduce the rotation speed of the handle 21 and increase the torque at the same time, so as to ensure that the flipping process is more stable and accurate. The operator inputs power to the reducer 22 by rotating the handle 21, and the reducer 22 converts the high-speed small torque rotation of the handle 21 into a low-speed large torque rotation output, and drives the flip assembly 3 to flip 180° through the transmission connection with the left shaft 14 or the right shaft 16. The advantage of this design is that the flipping action can be carried out more easily, avoiding the instability that may be caused by rapid flipping, and at the same time, due to the regulating effect of the reducer 22, the flipping process is more stable and controllable.

[0037] The aircraft engine power turbine assembly vehicle also includes a shaft tail positioning assembly, which includes a positioning base 24 provided on the vehicle body 1 and a spline sleeve 25 installed on the positioning base 24. The spline sleeve 25 cooperates with the shaft tail of the power turbine through a spline, so that the self-rotation of the shaft tail of the power turbine is limited when the shaft tail of the power turbine is inserted into the spline sleeve 25. The height position of the spline sleeve 25 matches the specifications of the power turbine, so that after the power turbine is moved axially to an assembly position matching the power turbine casing, the shaft tail of the power turbine is separated from the spline sleeve 25. The shaft tail positioning assembly cooperates with the positioning base 24 provided on the vehicle body 1 and the spline sleeve 25 installed on the positioning base 24. The spline sleeve 25 and the shaft tail of the power turbine are precisely matched through a spline structure. When the shaft tail of the power turbine is inserted into the spline sleeve 25, the self-rotation is limited, preventing the power turbine from unexpectedly rotating during the assembly process, and ensuring stability when moving axially. The height position of the spline sleeve 25 is designed to match the specifications of the power turbine, so that the power turbine can be moved axially to a precise assembly position, and after assembly, the shaft tail of the power turbine can naturally separate from the spline sleeve 25 without affecting subsequent operations. Therefore, this structure not only ensures the stability of the position and posture of the power turbine during assembly, but also allows for easy separation after assembly, thereby improving assembly efficiency and accuracy.

[0038] Two handles 20 are symmetrically arranged on the adjustment sleeve 19, and the handles 20 are axially perpendicular to the adjustment sleeve 19. By symmetrically arranging the two handles 20 on the adjustment sleeve 19, and the handles 20 are axially perpendicular to the adjustment sleeve 19, the operator can easily drive the adjustment sleeve 19 by rotating the handles 20, thereby controlling the up and down movement or circumferential rotation of the power turbine. The symmetrical design of the handles 20 helps to balance the force, making the adjustment process smoother and more stable, and reducing the uneven torque or offset that may be generated during unilateral operation.

[0039] The bottom of the vehicle body 1 is provided with a brake universal wheel 5, and a vehicle pusher 4 socket is provided on one side of the vehicle body 1, and the vehicle pusher 4 is plugged into the pusher socket. The brake universal wheel 5 provided at the bottom of the vehicle body 1 enables the assembly vehicle to move flexibly between different workstations, so that the assembly vehicle can adjust its position as needed; when the assembly vehicle reaches the specified position, the brake function can lock the universal wheel to ensure that the assembly vehicle remains stable during the assembly process and prevent position deviation from affecting the assembly accuracy. The pusher socket on one side of the vehicle body 1 is used to insert the vehicle pusher 4. The matching design of the pusher allows the operator to easily push or drag the assembly vehicle, thereby facilitating the movement of the assembly vehicle within a larger range.

[0040] The method for assembling a power turbine of an aircraft engine comprises the following steps:

[0041] S100, placing the power turbine shaft with its tail facing downward on the flip assembly 3 of the aircraft engine power turbine assembly vehicle;

[0042] S200, installing the power turbine casing on the flip assembly 3 of the assembly vehicle so that the power turbine casing and the power turbine are coaxial;

[0043] S300, moving the power turbine axially upward to make the power turbine reach a preset installation position;

[0044] S400, rotating and adjusting the power turbine so that the blades on the power turbine are matched with the blades in the power turbine casing;

[0045] S500, lock the power turbine casing and the power turbine, and rotate the power turbine and the power turbine casing synchronously by 180° by rotating the flip assembly 3, with the tail of the power turbine shaft facing upward;

[0046] S600, measure the axial distance between the end face of the power turbine casing and the power turbine blades. If the measurement result meets the assembly standard, the assembly is completed.

[0047] In step S100, the power turbine shaft tail is placed downward on the flip assembly 3 of the aircraft engine power turbine assembly vehicle, and the specific operation is as follows: First, the assembly vehicle will be pre-positioned to a stable working position and locked by the brake universal wheel 5 to ensure that the assembly vehicle will not move during the assembly process. Then, the power turbine is lifted by a lifting device or a crane so that its shaft tail is suspended downward above the assembly area. Next, the power turbine is slowly lowered and aligned with the flip assembly 3 of the assembly vehicle to ensure that the axis of the power turbine is accurately aligned with the rotation center line of the flip assembly 3. The flip assembly 3 usually has a guide device or an auxiliary positioning mechanism to help ensure that the power turbine can be quickly aligned when placed. The shaft tail of the power turbine needs to be inserted into the shaft tail positioning assembly of the flip assembly 3. The positioning assembly includes a spline sleeve 25, which cooperates with the spline structure of the power turbine shaft tail to ensure that the power turbine will not rotate or deviate during the initial assembly. At this time, the design of the spline sleeve 25 can limit the rotation of the power turbine and ensure the stability of the assembly process. When the tail of the power turbine shaft is accurately inserted into the positioning assembly and firmly placed, the lifting device will be released to complete the preliminary positioning of the power turbine. The purpose of this process is to stably install the power turbine on the flip assembly 3 to ensure that the following assembly steps can proceed smoothly, while ensuring that the axis of the power turbine is aligned with the center line of the flip assembly 3, thereby avoiding alignment problems in the subsequent assembly process.

[0048] In step S200, the power turbine casing is installed on the flip assembly 3 of the assembly vehicle. The specific operation of making the power turbine casing and the power turbine coaxial is to first lift the power turbine casing securely above the flip assembly 3 of the assembly vehicle through the lifting equipment and align it with the installation position on the flip assembly 3, and then slowly lower the casing to make it accurately placed on the upper positioning plate 11. The upper positioning plate 11 is usually designed with a positioning groove or a guide device to help the power turbine casing to automatically align and ensure that it remains coaxial with the axis of the power turbine.

[0049] In step S300, the specific operation of moving the power turbine axially upward to reach the preset installation position is to first drive the adjustment sleeve rod 19 to move up and down by rotating the adjustment handle 20 on the assembly vehicle, and the adjustment sleeve rod 19 is threadedly connected to the fixed sleeve 10, and the adjustment sleeve rod 19 is driven by the adjustment handle 20 to push the movable sleeve rod 9 connected to the power turbine to move upward. At this time, the power turbine rises steadily along the axial direction under the drive of the movable sleeve rod 9, ensuring that it gradually approaches and accurately aligns with the blades in the casing. When the power turbine moves to the preset installation position, the shaft tail of the power turbine will gradually disengage from the spline sleeve 25 in the shaft tail positioning assembly previously inserted, which means that the power turbine has completed the positioning task of the shaft tail and reached the position required for installation. The entire moving process must remain stable to ensure that the power turbine does not rotate or deflect during the moving process. After reaching the preset position, the assembly accuracy is guaranteed. The shaft tail is separated from the spline sleeve 25 to ensure that the power turbine can rotate freely for the next step of blade pairing without being restricted by the positioning assembly, thereby preparing for the precise adjustment and locking of the subsequent assembly.

[0050] In step S400, the specific operation of rotating and adjusting the power turbine so that the blades on the power turbine are matched with the blades in the power turbine casing is to manually rotate the movable sleeve rod 9 fixedly connected to the power turbine, and use the thrust ball bearing 13 to reduce the friction during rotation, so that the power turbine can rotate smoothly under the drive of the movable sleeve rod 9. During the rotation process, it is necessary to carefully observe the blades of the power turbine and the blades in the power turbine casing to ensure that the blades are gradually aligned.

[0051] In step S500, the power turbine casing and the power turbine are locked and the two are rotated synchronously by 180° by rotating the flip assembly 3. The specific operation steps are as follows: First, the movable sleeve rod 9 is firmly locked with a set screw to ensure that the power turbine and the power turbine casing remain fixed in relative position. This operation ensures that the two will not be misaligned during the flipping process. Then, the handle 21 connected to the input end of the reducer 22 is rotated. The reducer 22 will convert the high-speed rotation of the handle 21 into a low-speed high-torque output, and drive the left and right rotating shafts 16 of the flip assembly 3 through the transmission system. The left and right rotating shafts 16 are connected to the flip assembly 3. Under the action of the reducer 22, the flip assembly 3 begins to rotate slowly and steadily, and drives the locked power turbine and the power turbine casing to rotate synchronously by 180°.

[0052] During the entire flipping process, the relative position of the power turbine and the casing will not change, and the coaxial state will be maintained, because the design of the flip assembly 3 ensures the smoothness and accuracy of the flipping. When the flip assembly 3 completes a 180° rotation, the tail of the power turbine changes from facing downward to facing upward, reaching the required working position. Through this flipping method, the entire operation can be carried out smoothly, reducing the risks brought by manual flipping and improving assembly accuracy and efficiency.

[0053] In step S600, the axial distance between the end face of the power turbine casing and the power turbine blade is measured. Specifically, a precise measuring tool, such as a micrometer, a laser rangefinder or a special measuring jig, is prepared to ensure that the measurement accuracy meets the assembly standard. During measurement, the operator places one end of the measuring tool on the end face of the power turbine casing and the other end is aligned with the end face of the power turbine blade to accurately measure the axial distance between the casing end face and the blade.

[0054] If the measurement results show that the axial distances at all positions meet the tolerance range of 180±0.1 mm, it means that the assembly has met the design requirements and the entire assembly process can be considered complete; if there is an error in the measurement results, the operator needs to readjust the relative position of the blades or casing and make necessary fine adjustments until the measurement results meet the standards. Through this final precise measurement, it is ensured that the assembly between the power turbine and the casing meets the design standards and guarantees the working performance and operational reliability of the turbine.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An aircraft engine power turbine assembly method, characterized in that: The steps include: S100, placing the power turbine shaft with its tail facing downward on the flip assembly (3) of the aircraft engine power turbine assembly vehicle; S200, installing the power turbine casing on the flip assembly (3) of the assembly vehicle so that the power turbine casing and the power turbine are coaxial; S300, moving the power turbine axially upward to make the power turbine reach a preset installation position; S400, rotating and adjusting the power turbine so that the blades on the power turbine are matched with the blades in the power turbine casing; S500, locking the power turbine casing and the power turbine, and rotating the power turbine and the power turbine casing synchronously by 180° by rotating the flip assembly (3), with the tail of the power turbine shaft facing upward; S600, measure the axial distance between the end face of the power turbine casing and the power turbine blades. If the measurement result meets the assembly standard, the assembly is completed.

2. The method for assembling an aircraft engine power turbine according to claim 1, characterized in that: In step S100, a shaft tail positioning assembly is used to cooperate with the shaft tail of the power turbine to limit the rotation of the power turbine; in step S300, after the power turbine moves upward to a preset installation position, the shaft tail is separated from the shaft tail positioning assembly.

3. The method for assembling an aircraft engine power turbine according to claim 1, characterized in that: The flip assembly includes a power turbine casing clamping assembly and a power turbine supporting assembly. The power turbine casing clamping assembly is used to clamp and fix the power turbine casing, and the power turbine supporting assembly is used to support the power turbine body and drive the power turbine body to translate axially and rotate circumferentially.

4. The method for assembling an aircraft engine power turbine according to claim 3, characterized in that: The power turbine casing clamping assembly comprises a pressure plate (7), an upper positioning plate (11) and a pull rod (8); In step S200, the power turbine casing is mounted on the flip assembly (3) of the assembly vehicle, and the power turbine casing and the power turbine are made coaxial in the following manner: the power turbine casing is placed on the upper positioning plate (11), and the upper positioning plate (11) is provided with corresponding positioning grooves, so that the power turbine casing and the power turbine are made coaxial; In step S500, the method of locking the power turbine casing is: installing a pressure plate (7) on the power turbine casing, and tightening the pressure plate (7) and the upper positioning plate (11) through multiple pull rods (8) arranged along the axial direction, so that the upper positioning plate (11) and the pressure plate (7) clamp the power turbine casing.

5. The method for assembling an aircraft engine power turbine according to claim 4, characterized in that: The power turbine support assembly comprises a lower positioning plate (18) connected to an upper positioning plate (11), a fixed sleeve (10) arranged on the lower positioning plate (18), an adjusting sleeve rod (19) threadedly connected to the fixed sleeve (10), and a movable sleeve rod (9) fixedly connected to the power turbine, wherein the movable sleeve rod (9) is movably inserted into the fixed sleeve (10), the movable sleeve rod (9) and the adjusting sleeve rod (19) are both sleeved on the shaft of the power turbine, and the adjusting sleeve rod (19) is located below the movable sleeve rod (9) to support the movable sleeve rod (9); In step S300, the power turbine is moved axially upward to reach a preset installation position by rotating the adjusting sleeve (19), driving the adjusting sleeve (19) to move upward through the threaded fit between the adjusting sleeve (19) and the fixed sleeve (10), and the adjusting sleeve (19) pushes the movable sleeve (9) to move upward, thereby causing the power turbine to move upward.

6. The method for assembling an aircraft engine power turbine according to claim 5, characterized in that: The method of rotating and adjusting the power turbine in step S400 is: manually rotating the movable sleeve rod (9), thereby driving the power turbine to rotate.

7. The method for assembling an aircraft engine power turbine according to claim 6, characterized in that: The fixed sleeve (10) is provided with a fixing bolt (12) for locking the movement of the movable sleeve rod (9); The method of locking the power turbine in step S500 is: rotating the locking bolt so that the end of the locking bolt presses the movable sleeve rod (9) tightly, and limiting the movement of the movable sleeve rod (9) by the friction force between the locking bolt and the surface of the movable sleeve rod (9).

8. The method for assembling an aircraft engine power turbine according to claim 7, characterized in that: The assembly vehicle is provided with a flip driving source for driving the flip assembly (3) to rotate, the flip driving source comprising a support (23) provided on the vehicle frame (2) and a reducer (22) provided on the support (23), the input end of the reducer (22) being connected to a handle (21), and the output end of the reducer (22) being drivingly connected to a left rotating shaft (14) or a right rotating shaft (16); The method of rotating the rotating flip assembly (3) in step S500 is: turning the handle (21), transmitting and reducing speed through the reducer (22), thereby driving the flip assembly (3) to rotate at a speed lower than the rotation speed of the handle (21).

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