Balance weight assembly system for turbine rotor of aviation power device

Abstract

The invention relates to a balance weight assembly system for a turbine rotor of an aviation power device, and solves the problems of low product assembly quality, low production efficiency, waste of engine maintenance cost and the like in a traditional assembly method. Comprising a hydraulic riveting clamp, an adjustable support and a supporting backing ring. The supporting backing ring is used for supporting and positioning the supporting backing ring; the hydraulic riveting clamp is mainly composed of a handle, an oil inlet and return switch, a hydraulic pump, a piston, a dowel bar, a main supporting beam, a die and the like and provides necessary driving force for an assembly system, the die is customized according to different rotor models and installed at the tail end of the fixing clamp through a nut, and the radial positioning function of the hydraulic riveting clamp and the turbine rotor in the assembly process is achieved. Hydraulic force is converted into linear motion of the dowel bar, and the rivet assembling function is achieved. The adjustable support has the functions of supporting the working position of the hydraulic riveting clamp and adjusting the horizontal height in the assembling process. According to the invention, the labor intensity is effectively reduced, the production efficiency is improved, and the assembly quality is improved.

Description

Technical Field

[0001] This invention relates to the field of aircraft power plant maintenance technology, specifically to an assembly system for assembling and fixing the turbine rotor counterweight during the maintenance of aircraft power plants. Background Technology

[0002] During the maintenance of aero-engine systems, after performing three-stage turbine rotor balancing, the counterweight needs to be fixed to the turbine rotor counterweight mounting ring using rivets. This assembly requires high precision, with specific limitations on the rivet diameter, height, and other dimensional requirements after assembly. Traditional assembly methods are labor-intensive for operators, prone to rivet misalignment during the assembly process, and unable to effectively thicken the rivets, making it difficult to guarantee specified parameters. This results in low assembly pass rates, numerous reworks, significant waste of engine maintenance spare parts, low production efficiency, and hinders the normal delivery of complete engine maintenance systems. Summary of the Invention

[0003] The technical problem this invention aims to solve is how to achieve efficient and high-quality assembly of the balancing weights on the turbine rotor after the three-stage turbine rotor of an aero-engine has been balanced. By inventing this assembly system, problems such as high labor intensity, low product assembly quality, high rework rate, low pass rate, low production efficiency, and wasted engine maintenance costs associated with traditional assembly methods can be solved.

[0004] This invention is achieved through the following technical solutions: A counterweight assembly system for a turbine rotor of an aircraft power plant includes a hydraulic riveting clamp, an adjustable support, and a support pad ring. The support pad ring supports and positions the turbine rotor, and is provided with an annular support surface that mates with the turbine rotor and a central cylindrical positioning surface, cylindrical support surface or circular hole support surface. The adjustable support includes a V-block 21, a base plate 27, a vertical cylinder 26 and a screw 22. The vertical cylinder 26 is fixedly connected to the base plate 27, and the upper part of the screw 22 is fixedly connected to the V-block 21, while the lower part is screwed to the vertical cylinder 26. The hydraulic riveting clamp includes a positioning mechanism, a hydraulic drive mechanism, and an execution mechanism; The positioning mechanism includes a clamping screw 1, a spring 5, a fixing clamp 6, and a mold 17. The fixing clamp 6 is slidably installed in the cavity of the main support beam 8 of the actuator. The left end of the cavity of the main support beam 8 is connected to a baffle 3 by a slotted pan head screw 2. The clamping screw 1 is screwed onto the baffle 3, and its end contacts the spring baffle 4 connected to the end of the fixing clamp 6. A spring 5 is installed between the spring baffle 4 and the fixing clamp 6. The other end of the fixing clamp 6 is fixedly connected to the mold 17 by a nut. The mold 17 can fit tightly against the arc surface of the turbine rotor counterweight mounting ring. A bushing 11 is fitted on the end of the fixing clamp 6 near the mold 17. The hydraulic drive mechanism includes a handle, a hydraulic pump 18, a piston 19, and an inlet and return valve switch. The handle is placed next to the inlet and return valve switch. Repeatedly pressing the handle provides input force to the hydraulic pump, which provides pressure to the assembly system and pushes the piston 19 to move linearly. The inlet and return valve switch controls the oil circuit switch of the hydraulic pump 18, and the piston 19 realizes reciprocating motion. The actuator includes a force transmission rod 9, a pressure head 15, a guide rail 10, a compression spring 13, and a main support beam 8. The main support beam 8 is connected to the hydraulic drive mechanism via threads. The piston 19 of the hydraulic drive mechanism pushes the force transmission rod 9 to reciprocate linearly on the guide rail 10. The pressure head 15 is fixed to the end of the force transmission rod 9. The guide rail 10 is fixed to the main support beam 8. A stop block I12 is installed on the surface where the force transmission rod 9 mates with the guide rail 10. A stop block II14 (via a cross-slot countersunk screw 7) is installed on the surface where the main support beam 8 mates with the guide rail 10. The compression spring 13 is connected between the stop block I12 and the stop block II14. A slotted headless axial screw 16 is installed at the end of the main support beam 8 near the mold 17 as a limit for the axial movement of the fixed clamp 6.

[0005] The mold 17 is designed with a slot to avoid rivets.

[0006] The beneficial effects of this invention are: (1) By using the hydraulic pump output pressure of the hydraulic riveting pliers, the operator no longer needs to apply a large torque to make the rivet up to the specified value, easily achieving balanced rivet assembly, effectively reducing labor intensity and improving production efficiency.

[0007] (2) The hydraulic riveting pliers are designed with a centering mold. During assembly, the mold fits tightly with the arc surface of the turbine rotor counterweight mounting ring to ensure that the pressure head of the hydraulic riveting pliers, the main support beam and the riveted rivet are concentric, thus achieving radial positioning and preventing the rivet from tilting in the radial direction during assembly, thereby improving the assembly quality and increasing the pass rate.

[0008] (3) By designing a support ring to support and horizontally position the turbine rotor, and designing an adjustable support and a horizontally positioned hydraulic riveting pliers, the turbine rotor and the hydraulic riveting pliers are positioned at the same horizontal level as the rivets during assembly, preventing the rivets from tilting horizontally during assembly, reducing rework, and saving engine maintenance costs. Attached Figure Description

[0009] Figures 1-1, 1-2, and 1-3 are schematic diagrams of three different support pad rings; Figure 2. Design drawing of hydraulic riveting pliers, in which... Figure 2b yes Figure 2a AA section view; Figure 3. Schematic diagram of the support pad ring, in which Figure 3b yes Figure 3a AA sectional view. Detailed Implementation

[0010] This invention relates to a counterweight assembly system for aero-engine turbine rotors. The system mainly consists of a hydraulic riveting clamp, an adjustable support, and a support pad ring. The support pad ring supports and positions the product, while the adjustable support supports and adjusts the hydraulic riveting clamp to the appropriate height, enabling efficient assembly of rivets.

[0011] A turbine rotor balancing counterweight assembly system for an aircraft power plant will now be described in more detail with reference to Figures 1 to 3.

[0012] Figure 1 is a schematic diagram of the support pad ring: During assembly, the corresponding support pad ring is selected according to the different turbine rotor structure dimensions to achieve the function of supporting and positioning the turbine rotor, ensuring that the turbine rotor remains stable and at the required horizontal height during assembly.

[0013] Figure 1-1 , 1-2 Figure 1-3 are schematic diagrams of three different support pad rings, wherein support pad ring I includes an annular support surface 31 and a central cylindrical positioning surface 32; support pad ring II includes an annular support surface 31 and a central cylindrical support surface 33; and support pad ring III includes an annular support surface 31 and a central circular hole support surface 33.

[0014] The hydraulic riveting clamp mainly consists of a handle, inlet and outlet oil switches, a hydraulic pump, a piston, a force transmission rod, a main support beam, and a mold, providing the necessary driving force for the assembly system. The mold is customized according to different rotor models and is installed at the end of the clamp using a nut, enabling the hydraulic riveting clamp to radially position the turbine rotor during assembly.

[0015] Figure 2 is a schematic diagram of a hydraulic riveting pliers: This diagram shows the internal structure and working principle of the hydraulic riveting pliers, which realizes the riveting assembly function by converting hydraulic pressure into the linear motion of the force transmission rod.

[0016] It mainly consists of three parts: a positioning mechanism, a hydraulic drive mechanism, and an actuator. The positioning mechanism comprises a clamping screw 1, a spring 5, a fixing clamp 6, and a mold 17, and is placed under the main support beam 8 of the actuator. By adjusting the clamping screw 1, the mold 17 is made to fit tightly against the arc surface of the turbine rotor counterweight mounting ring, ensuring that the pressure head 15, rivets, and main support beam 8 remain concentric during assembly, thus achieving radial positioning.

[0017] Specifically, the fixing clamp 6 is slidably installed in the cavity of the main support beam 8 of the actuator. The left end of the cavity of the main support beam 8 is connected to a baffle 3 by a slotted pan head screw 2. The clamping screw 1 is screwed onto the baffle 3, and its end contacts the spring baffle 4 connected to the end of the fixing clamp 6. A spring 5 is installed between the spring baffle 4 and the fixing clamp 6. The other end of the fixing clamp 6 is fixedly connected to a mold 17 by a nut. The mold 17 can fit tightly against the arc surface of the turbine rotor counterweight mounting ring. A bushing 11 is fitted on the end of the fixing clamp 6 near the mold 17.

[0018] The hydraulic drive mechanism includes a handle, a hydraulic pump 18, a piston 19, and an inlet / return valve switch. The handle is placed next to the inlet / return valve switch. Repeatedly pressing the handle provides input force to the hydraulic pump, which provides pressure to the assembly system, pushing the piston 19 to move linearly. The inlet / return valve switch controls the oil circuit switch of the hydraulic pump 18, enabling the piston 19 to reciprocate.

[0019] The actuator includes a force transmission rod 9, a pressure head 15, a guide rail 10, a compression spring 13, and a main support beam 8. The main support beam 8 is connected to the hydraulic drive mechanism via threads. The piston 19 of the hydraulic drive mechanism pushes the force transmission rod 9 to reciprocate linearly on the guide rail 10. The pressure head 15 is fixed at the end of the force transmission rod 9 and is retracted by the compression spring 13. The pressure head 15 and the main support beam 8 work together to apply pressure to the rivet, thereby compressing and upsetting the rivet.

[0020] Specifically, the main support beam 8 is connected to the hydraulic drive mechanism via threads. The piston 19 of the hydraulic drive mechanism pushes the force transmission rod 9 to reciprocate linearly on the guide rail 10. A pressure head 15 is fixed at the end of the force transmission rod 9. The guide rail 10 is fixed to the main support beam 8. A stop block I12 is installed on the surface where the force transmission rod 9 mates with the guide rail 10. A stop block II14 (via a cross-slot countersunk screw 7) is installed on the surface where the main support beam 8 mates with the guide rail 10. A compression spring 13 is connected between the stop block I12 and the stop block II14. A slotted headless axial screw 16 is installed at the end of the main support beam 8 near the mold 17 as a limit for the axial movement of the fixed clamp 6.

[0021] Figure 3 is a schematic diagram of the adjustable support: its main function is to support the working position and adjust the horizontal height of the hydraulic riveting pliers during assembly, ensuring that the hydraulic riveting pliers and the turbine rotor maintain the required horizontal height during assembly. It includes a base plate 27, a vertical cylinder 26, a cylindrical pin 25, a slotted flat-end set screw 24, a lifting nut 23, a screw rod 22, and a V-block 21. The vertical cylinder 26 is fixed to the base plate 27. The lifting nut 23 is screwed to the top of the vertical cylinder 26 and secured by the set screw 24. The V-block 21 is screwed to the screw rod 22 and the lifting nut 23. The screw rod 22 and the vertical cylinder 26 are connected and positioned by the cylindrical pin 25.

[0022] By rotating the V-shaped support screw of the support, the support height of the support can be adjusted to ensure that the hydraulic riveting pliers are at different working heights when assembling different products, so that the hydraulic riveting pliers are kept parallel to the turbine rotor balance weight mounting ring, and the rivet head is prevented from tilting in the up and down direction during assembly.

[0023] By supporting and horizontally positioning the turbine rotor with a support ring, using an adjustable support to support and horizontally position the hydraulic riveting pliers, and employing a mold to ensure radial positioning of the hydraulic riveting pliers and turbine rotor, and by using a hydraulic pump to output working pressure, the assembly of the balanced counterweight is achieved efficiently.

[0024] The molds are designed and manufactured in different sizes and specifications according to the different diameters of the turbine rotor counterweight mounting rings. They can be flexibly replaced during assembly to ensure that the molds fit tightly against the outer circular surface of the turbine rotor counterweight mounting rings, thereby achieving radial positioning.

[0025] To avoid the rivets already installed on the counterweight mounting ring, the mold is designed with a clearance slot to ensure that the mold fits tightly against the outer surface of the turbine rotor counterweight mounting ring.

[0026] In assembly work, the assembly process includes the following steps: Step S100: Support and positioning: Select the corresponding support pad ring according to the required turbine rotor structure size, place the selected support pad ring on the worktable, and place the turbine rotor on the support pad ring to achieve stable support and horizontal positioning of the turbine rotor during assembly.

[0027] Step S200: Material placement: Insert the rivet through the counterweight and install it into the hole at the required assembly position inside the turbine rotor counterweight mounting ring, ensuring that the rivet end faces outwards.

[0028] Step S300: Mold selection: Select the corresponding mold 17 according to the required turbine rotor structure size. Install the mold 17 on the right end of the fixing clamp 6 with a nut to ensure that the arc surface of the mold can fit with the outer circle of the turbine rotor counterweight mounting ring during assembly.

[0029] Step S400: Device placement: Place the adjustable support next to the support pad ring, place the hydraulic riveting pliers on the adjustable support, and use the adjustable support V-block 1 to support the threaded connection of the hydraulic pump, so as to realize the supporting function of the hydraulic riveting pliers during the assembly process.

[0030] Step S500: Height Adjustment: Rotate the lifting nut 3 of the adjustable support to drive the screw 2 to adjust the V-block 1 to support the hydraulic riveting pliers to the required height, so that the hydraulic riveting pliers and the turbine rotor are kept at a horizontal height, avoiding the rivet head from tilting up and down in the horizontal direction during assembly.

[0031] Step S600: Mold positioning: By turning the clamping screw 1, push the fixing clamp 6 to move the mold 17 to the right, so that the mold 17 is tightly fitted with the outer circular surface of the turbine rotor counterweight mounting ring. If there are rivets installed at the fitting point of the mounting ring, the mold can be aligned with the rivets through the groove designed in the mold to avoid them, ensuring that the pressure head 15, the main support beam 8 and the assembly rivets are concentric, and realizing the radial positioning function during assembly.

[0032] Step S700: Manual force application: Adjust the inlet and outlet valve switch of the hydraulic riveting pliers to the "ON" position, press the handle repeatedly to apply pressure to the hydraulic pump 18, and push the piston 19 to move to the right.

[0033] Step S800: Assembly execution: Piston 19 pushes force transmission rod 9 to move linearly to the right on guide rail 10. The pressure head 15 fixed to force transmission rod 9 cooperates with main support beam 8 to apply pressure to rivet, and rivet upsetting is achieved under continuous pressure.

[0034] Step S900: Complete assembly: After the rivet is uptaken, adjust the oil inlet and outlet valve switch to the "OFF" position. The piston 19 will automatically retract to the left, and the pressure head 15 will automatically move to the left under the action of the compression spring 13. The fixing clamp 6 will drive the mold 17 to move to the left and retract under the action of the spring 5. Remove the hydraulic riveting pliers to check that the rivet dimensions after riveting meet the specified values, and the assembly is complete.

[0035] Compared to the original assembly technology, the first-pass yield rate using this invention has increased from 80% to 98%, and the assembly time has been reduced from 40 minutes per unit to 20 minutes per unit, saving 1,500 yuan per unit in spare parts costs. Based on an annual assembly target of 100 units, an average comprehensive cost of 80 yuan per person per hour, and a 30-year service life for the aero-engines, the total savings in repair costs are approximately 8 million yuan. This invention significantly enhances the repair and support capabilities for aviation equipment.

Claims

1. A counterweight assembly system for balancing turbine rotors of an aircraft power plant, characterized in that: Includes hydraulic riveting pliers, adjustable supports, and support pads; The support pad ring supports and positions the turbine rotor, and is provided with an annular support surface that mates with the turbine rotor and a central cylindrical positioning surface, cylindrical support surface or circular hole support surface. The adjustable support includes a V-block (21), a base plate (27), a vertical cylinder (26) and a screw (22). The vertical cylinder (26) is fixedly connected to the base plate (27), and the upper part of the screw (22) is fixedly connected to the V-block (21), and the lower part is screwed to the vertical cylinder (26). The hydraulic riveting clamp includes a positioning mechanism, a hydraulic drive mechanism, and an execution mechanism; The positioning mechanism includes a clamping screw (1), a spring (5), a fixing clamp (6), and a mold (17). The fixing clamp (6) is slidably installed in the cavity of the main support beam (8) of the actuator. A baffle (3) is connected to the left end of the cavity of the main support beam (8). The clamping screw (1) is screwed onto the baffle (3), and its end contacts the spring baffle (4) connected to the end of the fixing clamp (6). A spring (5) is installed between the spring baffle (4) and the fixing clamp (6). The other end of the fixing clamp (6) is fixedly connected to the mold (17). The mold (17) can fit tightly against the arc surface of the turbine rotor counterweight mounting ring. The hydraulic drive mechanism includes a handle, a hydraulic pump (18), a piston (19), and an inlet / outlet valve switch. The handle is placed next to the inlet / outlet valve switch. Repeatedly pressing the handle provides input force to the hydraulic pump, which provides pressure to the assembly system and pushes the piston (19) to move linearly. The inlet / outlet valve switch controls the oil circuit switch of the hydraulic pump (18), and the piston (19) achieves reciprocating motion. The actuator includes a force transmission rod (9), a pressure head (15), a guide rail (10), a compression spring (13), and a main support beam (8). The main support beam (8) is connected to a hydraulic drive mechanism. The piston (19) of the hydraulic drive mechanism pushes the force transmission rod (9) to reciprocate linearly on the guide rail (10). The pressure head (15) is fixed at the end of the force transmission rod (9). The guide rail (10) is fixed to the main support beam (8). A stop block I (12) is installed on the surface where the force transmission rod (9) mates with the guide rail (10). A stop block II (14) is installed on the surface where the main support beam (8) mates with the guide rail (10). The compression spring (13) is connected between the stop block I (12) and the stop block II (14).

2. The turbine rotor balancing counterweight assembly system for an aircraft power unit according to claim 1, characterized in that: The mold (17) is designed with a slot to avoid rivets.

3. The turbine rotor balancing counterweight assembly system for an aircraft power unit according to claim 1, characterized in that: The left end of the cavity of the main support beam (8) is connected to a baffle (3) by a slotted pan head screw (2).

4. The turbine rotor balancing counterweight assembly system for an aircraft power unit according to claim 1, characterized in that: The other end of the fixing clamp (6) is fixedly connected to the mold (17) by a nut.

5. The turbine rotor balancing counterweight assembly system for an aircraft power unit according to claim 1, characterized in that: The fixing clamp (6) has a bushing (11) fitted on the end near the mold (17).

6. The turbine rotor balancing counterweight assembly system for an aircraft power plant according to claim 1, characterized in that: The main support beam (8) is connected to the hydraulic drive mechanism by threads.

7. The turbine rotor balancing counterweight assembly system for an aircraft power unit according to claim 1, characterized in that: The main support beam (8) is fitted with a stop block II (14) on the surface of the guide rail (10) by a cross-slot countersunk screw (7).

8. The turbine rotor balancing counterweight assembly system for an aircraft power unit according to claim 1, characterized in that: The main support beam (8) is equipped with a slotted headless shaft screw (16) at one end near the mold (17) as a limit for the axial movement of the fixing clamp (6).

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