Assembly method of aircraft engine power turbine

Abstract

The present invention discloses a method for assembling an aero-engine power turbine, which belongs to the technical field of aero-engine power turbine assembly. The method comprises the following steps: step S100, placing the power turbine shaft tail downward on a flip assembly of an aero-engine power turbine assembly vehicle; step S200, installing the power turbine casing on the flip assembly of the assembly vehicle so that the power turbine casing and the power turbine are coaxial; step S300, moving the power turbine axially upward so that the power turbine reaches a preset installation position; step 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; step S500, locking the power turbine casing and the power turbine, and rotating the power turbine and the power turbine casing synchronously by 180 degrees by rotating the flip assembly so that the power turbine shaft tail faces upward; step S600, measuring the axial distance between the end face of the power turbine casing and the power turbine blades, and completing the assembly if the measurement result meets the assembly standard. The present invention has the advantage of improving the efficiency of power turbine assembly.

Description

Technical Field

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

[0002] The power turbine of an aircraft engine is a critical component. Its primary function is to convert the energy of the high-temperature, high-pressure gases generated by combustion into mechanical energy. The power turbine receives high-speed, 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, forming an integral 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 inside 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 inside the casing, and the assembly of the two blades is directional, the power turbine is required to be assembled only vertically from 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 use a measuring tool to measure the vertical spacing dimension of 180±0.1 mm. Since the power turbine assembly is 1.1 meters long and slender, and needs to be flipped 180° to measure the assembly dimensions in the vertical direction, it requires the cooperation of multiple people and the assistance of a hanging device, which reduces the assembly efficiency. Summary of the Invention

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

[0005] According to one aspect of the present invention, a method for assembling an aircraft engine power turbine is provided, comprising step S100 of placing a power turbine shaft with its tail facing 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 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 180 degrees synchronously by rotating the flip assembly, with the power turbine shaft tail facing upwards;

[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 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.

[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 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 movably inserted into the fixed sleeve, the movable sleeve and the adjusting sleeve are both sleeved on the shaft of the power turbine, and the adjusting sleeve is located below the movable sleeve to support the movable sleeve; in step S300, the power turbine is moved axially upward to reach a preset installation position by rotating the adjusting sleeve, driving the adjusting sleeve to move upward through the threaded cooperation of the adjusting sleeve and the fixed sleeve, and the adjusting sleeve pushes the movable sleeve to move upward, thereby causing the power turbine to move upward.

[0015] Optionally, the method for rotating and adjusting the power turbine in step S400 is: manually rotating the movable sleeve rod to drive 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 vehicle 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 for transmission; the method of rotating the flip assembly in step S500 is: rotating the handle, transmitting and decelerating through the reducer, and then driving the flip assembly to rotate at a speed lower than the handle rotation speed.

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

[0019] The power turbine shaft is placed tail-down on the assembly vehicle's flip assembly, locating it in an initial, stable assembly position and avoiding the complexity of manual handling. The power turbine casing is coaxially mounted with the power turbine, and the precise positioning of the casing clamping assembly ensures that the casing and power turbine are not misaligned during assembly, thereby avoiding time-consuming repeated adjustments. The power turbine smoothly rises axially to a preset installation position, and the up-and-down adjustment function of the adjustment sleeve ensures accurate assembly, reduces human error, and avoids multiple adjustments. The power turbine is adjusted by autorotation to precisely align the blades with those in the casing, ensuring the directionality of assembly and avoiding the complex manual pairing operation. After locking, the power turbine and casing are synchronously flipped 180 degrees. The design of the flip assembly makes this process smooth and fast, reducing the time-consuming and labor-intensive manual flipping operation. Assembly accuracy is confirmed through measurement, and the measurement position after flipping is used to optimize the use of measuring tools, 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 manual operations, achieving 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 below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying 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. Vehicle body; 2. Vehicle frame; 3. Flip assembly; 4. Car pusher; 5. Brake swivel wheel; 6. Car pusher socket; 7. Pressure plate; 8. Pull rod; 9. Moving sleeve; 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; 20. Handle; 21. Handle; 22. Reducer; 23. Support; 24. Positioning base; 25. Spline sleeve. DETAILED DESCRIPTION

[0026] The embodiments of the present invention will be 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 aero-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 itself or under the action of 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 provided on the frame 2, and 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 or external force of the vehicle body 1, and the frame 2 provides a stable support platform for the entire assembly process. The flip assembly 3 is installed on the vehicle frame 2 and cooperates with its rotation 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 moving. The power turbine support assembly supports and adjusts the axial translation and circumferential rotation of the power turbine body, making the assembly process more precise and ensuring the matching 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 are clamped at the same time, thereby ensuring that the casing remains stable and motionless during the assembly process. This 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 engaged 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 the upper positioning plate 11, a fixed sleeve 10 provided on the lower positioning plate 18, an adjusting sleeve 19 threadedly connected to the fixed sleeve 10, and a movable sleeve 9 fixedly connected to the power turbine, the movable sleeve 9 movably inserted into the fixed sleeve 10, the movable sleeve 9 and the adjusting sleeve 19 are both sleeved on the shaft of the power turbine, and the adjusting sleeve 19 is located below the movable sleeve 9 to support the movable sleeve 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 19 threadedly connected thereto can adjust the up and down displacement of the power turbine by rotation, and the movable sleeve 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 needed. 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 precise 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 engaged with the fixed sleeve 10, and the end of the set bolt 12 passes through the fixed sleeve 10 and abuts against the outer wall of the movable sleeve 9. The set bolt 12 is threadedly engaged with the fixed sleeve 10. When the operator rotates the set bolt 12, the end of the bolt passes through the fixed sleeve 10 and abuts 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, keeping it stationary during the assembly process. This design ensures that when precise positioning is required, the power turbine will not deviate from its position due to external forces or operation, thereby maintaining the stability and accuracy of the assembly.

[0034] A thrust ball bearing 13 is disposed between the movable sleeve 9 and the adjustment sleeve 19. The purpose of providing this between the movable sleeve 9 and the adjustment sleeve 19 is to reduce friction between the sleeves during assembly of the power turbine, thereby enabling the movable sleeve 9 to translate or rotate axially more smoothly while maintaining high stability and precision. The thrust ball bearing 13 is designed to withstand axial loads and allow rotation. This allows for easier and more precise movement of the movable sleeve 9 when the adjustment sleeve 19 drives the movable sleeve 9 to rise, fall, or rotate, reducing the impact of mechanical friction on assembly accuracy.

[0035] The flip assembly 3 also includes a rocker arm disposed between the upper positioning plate 11 and the lower positioning plate 18. The rocker arm is symmetrically provided with a left shaft 14 and a right shaft 16. The frame 2 is provided with a left shaft sleeve 15 that cooperates with the left shaft 14 and a right shaft sleeve 17 that cooperates with the right shaft 16. The design of the rocker arm, the left shaft 14, and the right shaft 16 enables the flip assembly 3 to achieve a smooth 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 and cooperate with the left shaft sleeve 15 and the right shaft sleeve 17 on the frame 2, respectively, to form the rotation axis for the power turbine flip. This design ensures balance and accuracy during flipping, can effectively withstand the forces generated during the flipping process, and avoids shaking or instability during the flipping process, thereby ensuring that the flipping assembly process of the power turbine and the casing is stable and smooth.

[0036] The overturning drive source comprises a support 23 arranged on the frame 2 and a speed reducer 22 arranged on the support 23. The input end of the speed reducer 22 is connected with a handle 21, and the output end of the speed reducer 22 is transmission-connected with the left-hand shaft 14 or the right-hand shaft 16. The effect of the speed reducer 22 is to reduce the rotation speed of the handle 21 and improve torque at the same time, thereby ensuring that the overturning process is more stable and accurate. The operator inputs power to the speed reducer 22 by rotating the handle 21. The speed reducer 22 converts the high-speed, low-torque rotation of the handle 21 into a rotation output with low-speed, high-torque, and drives the overturning assembly 3 to overturn 180 degrees by being transmission-connected with the left-hand shaft 14 or the right-hand shaft 16. The benefit of such a design is that the overturning action can be carried out more easily, thereby avoiding the instability that may be caused by rapid overturning. Simultaneously, due to the regulating effect of the speed reducer 22, the overturning 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 mounted on the positioning base 24. The spline sleeve 25 cooperates with the shaft tail of the power turbine through a spline, so that the power turbine shaft tail is restricted from rotation when 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 that matches the power turbine casing, the shaft tail of the power turbine is disengaged from the spline sleeve 25. The shaft tail positioning assembly works in conjunction with the positioning base 24 provided on the vehicle body 1 and the spline sleeve 25 mounted 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, its rotation is restricted, preventing the power turbine from rotating unexpectedly during the assembly process and ensuring stability during axial movement. The height of the splined sleeve 25 is designed to match the specifications of the power turbine. This allows the turbine to be moved axially to the precise assembly position. Once assembled, the turbine shaft tail can naturally separate from the splined sleeve 25 without affecting subsequent operations. This structure ensures the stability of the turbine's position and posture during assembly while allowing for easy separation after assembly, improving assembly efficiency and accuracy.

[0038] Two handles 20 are symmetrically positioned on the adjustment sleeve 19, perpendicular to its axis. By symmetrically positioning the handles 20 perpendicularly, the operator can easily rotate the handles 20 to control the adjustment sleeve 19, thereby controlling the vertical movement or circumferential rotation of the power turbine. The symmetrical design of the handles 20 helps balance force, making the adjustment process smoother and more stable, and reducing the uneven torque or offset that may occur when operating from one side.

[0039] The bottom of the vehicle body 1 is equipped with a braked universal wheel 5. A handle 4 socket is located on one side of the vehicle body 1. The handle socket is plugged into the handle socket. The braked universal wheel 5 on the bottom of the vehicle body 1 allows the assembly vehicle to be flexibly moved between different workstations, facilitating adjustment of the vehicle's position as needed. When the vehicle reaches a designated position, the brake function locks the universal wheel, ensuring the vehicle remains stable during the assembly process and preventing positional deviation that affects assembly accuracy. The handle socket on the side of the vehicle body 1 is used to insert the handle 4. The handle's design allows the operator to easily push or drag the assembly vehicle, facilitating its movement over a wide range.

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

[0041] S100, placing the power turbine shaft tail-down 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 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 180 degrees synchronously by rotating the flip assembly 3, with the power turbine shaft tail 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 is placed with its shaft tail facing downward on the flip assembly 3 of the aircraft engine power turbine assembly vehicle. The specific operation is as follows: First, the assembly vehicle is pre-positioned in a stable working position and locked by the brake universal wheel 5 to ensure that the assembly vehicle does not move during the assembly process. Then, the power turbine is lifted using a lifting device or crane so that its shaft tail faces downward and is suspended above the assembly area. Next, the power turbine is slowly lowered and aligned with the flip assembly 3 of the assembly vehicle, ensuring that the axis of the power turbine is precisely aligned with the rotation centerline of the flip assembly 3. The flip assembly 3 usually has a guide device or auxiliary positioning mechanism to help ensure that the power turbine can be quickly aligned during placement. 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, by cooperating with the spline structure of the power turbine shaft tail, ensures that the power turbine does not rotate or deviate during 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. Once the power turbine's shaft tail is accurately inserted into the positioning assembly and securely positioned, the lifting device is released, completing the initial positioning of the power turbine. This process ensures that the power turbine is stably mounted on the tilt assembly 3, ensuring smooth assembly. It also ensures that the power turbine's axis is aligned with the centerline of the tilt assembly 3, thus avoiding alignment issues during subsequent assembly.

[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 so that it is accurately placed on the upper positioning plate 11. The upper positioning plate 11 is usually designed with a positioning groove or guide device to help the power turbine casing automatically align to ensure that it remains coaxial with the axis of the power turbine.

[0049] In step S300, the specific operation for moving the power turbine axially upward to the preset installation position is to first rotate the adjustment handle 20 on the assembly vehicle to drive the adjustment sleeve 19 up and down. The adjustment sleeve 19 is threadedly connected to the fixed sleeve 10. Rotating the adjustment handle 20 causes the adjustment sleeve 19 to push the movable sleeve 9 connected to the power turbine upward. At this point, the power turbine, driven by the movable sleeve 9, rises smoothly axially, ensuring that it gradually approaches and precisely aligns with the blades in the casing. When the power turbine moves to the preset installation position, the shaft tail of the power turbine gradually disengages the spline sleeve 25 previously inserted in the shaft tail positioning assembly, indicating that the power turbine has completed the shaft tail positioning task and reached the required installation position. The entire movement process must be stable to ensure that the power turbine does not rotate or deflect during movement. Once the preset position is reached, assembly accuracy is guaranteed. The shaft tail disengages 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 precise adjustment and locking during subsequent assembly.

[0050] In step S400, the power turbine is rotated and adjusted to align the blades on the power turbine with the blades in the power turbine casing. The specific operation is to manually rotate the movable sleeve 9 fixedly connected to the power turbine, using the thrust ball bearing 13 to reduce friction during rotation, so that the power turbine rotates smoothly under the drive of the movable sleeve 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, use the set screw to firmly lock the movable sleeve 9 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, rotate the handle 21 connected to the input end of the reducer 22. 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 power turbine casing to rotate synchronously by 180°.

[0052] Throughout the entire turning process, the design of the turning assembly 3 ensures smooth and precise turning, ensuring that the relative position of the power turbine and the casing remains unchanged and remains coaxial. When the turning assembly 3 completes a 180° rotation, the tail of the power turbine shaft transitions from downward to upward, achieving the desired operating position. This method of turning ensures a smooth and precise operation, reducing the risks associated with manual turning and improving assembly precision and efficiency.

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

[0054] If the measurement results show that the axial distances at all locations meet the tolerance range of 180 ± 0.1 mm, the assembly meets the design requirements and the entire assembly process is considered complete. If the measurement results show errors, the operator needs to readjust the relative positions of the blades or casing and make necessary fine adjustments until the measurement results meet the standards. This final, precise measurement ensures that the assembly between the power turbine and the casing meets the design standards, ensuring the turbine's operating performance and reliability.

[0055] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection 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 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 degrees by rotating the flip assembly (3), with the tail of the power turbine shaft facing upwards; 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. The flip assembly 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. 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. 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 coaxial; In step S500, the method of locking the power turbine casing is as follows: a pressure plate (7) is installed on the power turbine casing, and the pressure plate (7) and the upper positioning plate (11) are tightened by a plurality of 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; 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 (19) threadedly connected to the fixed sleeve (10), and a movable sleeve (9) fixedly connected to the power turbine, wherein the movable sleeve (9) is movably inserted into the fixed sleeve (10), the movable sleeve (9) and the adjusting sleeve (19) are both sleeved on the shaft of the power turbine, and the adjusting sleeve (19) is located below the movable sleeve (9) to support the movable sleeve (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 engagement of 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.

2. The method for assembling an aircraft engine power turbine according to claim 1, wherein: 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 2, wherein: The method for rotating and adjusting the power turbine in step S400 is: manually rotating the movable sleeve rod (9), thereby driving the power turbine to rotate.

4. The method for assembling an aircraft engine power turbine according to claim 3, wherein: 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), 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).

5. The method for assembling an aircraft engine power turbine according to claim 4, characterized in that: The assembly vehicle is provided with a turning drive source for driving the turning assembly (3) to rotate. The turning drive source comprises 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) is connected to a handle (21), and the output end of the reducer (22) is in driving connection with a left rotating shaft (14) or a right rotating shaft (16). The method of rotating the rotating flip assembly (3) in step S500 is: rotating the handle (21), transmitting and reducing speed through the reducer (22), and then driving the flip assembly (3) to rotate at a speed lower than the speed of the handle (21).

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