Aerospace engine supercharging stage dismounting tool

Abstract

The application belongs to the technical field of engine assembly, and particularly relates to a turbocharging stage dismounting tool for an aero-engine. The tool comprises a main support (10) in a cylinder structure, having a front clamping block (11) and a rear clamping block (13) for clamping the web plate (201) of a fan shaft (2); a central support shaft (20) rotatably arranged in the main support cylinder, with a coaxial driving extension rod (24) connected to the front end; a cross rotating frame (21) comprising a shaft threadedly connected to the central support shaft (20) and four tracks extending radially on the outer wall of the shaft, with a sector-shaped sliding block (22) slidingly arranged in each track, the sector-shaped sliding block (22) being fixed at the proximal end or the distal end by a contraction positioning pin (23), and the end of the sector-shaped sliding block (22) having a stop opening for abutting against the rear end surface of the turbocharging stage (1) to be dismounted. When the turbocharging stage is dismounted, the application avoids knocking against the machine parts, and the operation is more convenient.

Description

Technical Field

[0001] This application belongs to the field of engine assembly technology, and specifically relates to a disassembly tooling for the booster stage of an aero-engine. Background Technology

[0002] A turbocharger stage is a device used to increase the overall pressure ratio and internal airflow of an engine; sometimes referred to as a low-pressure compressor. As a crucial component of a high-bypass turbofan engine, the turbocharger plays a vital role in determining engine performance. During the research and development phase, the engine requires repeated assembly and disassembly, necessitating the removal of the turbocharger stage from the fan shaft. Existing disassembly tools include... Figure 1 As shown. Before disassembly, the connection between the booster stage 1 and the fan shaft 2 is an interference fit; the fan shaft 2 and the low-pressure turbine shaft 3 are also an interference fit, and the low-pressure turbine shaft 3 and the fan shaft 2 are fastened together by the low-pressure turbine shaft head nut 4. When disassembling the booster stage 1, the jack cylinder 8 is placed at the end of the low-pressure turbine shaft 3, and then the support plate 6 is fastened to the booster stage 1 with bolts 5. Then, the hydraulic jack 7 is installed on the support plate 6, so that the right end of the jack 7 contacts the jack cylinder 8. During disassembly, the operator will use the jack 7 to apply a pushing force to the support plate 6, thereby causing the booster stage 1 to separate from the fan shaft 2.

[0003] The above disassembly method has the following disadvantages:

[0004] 1. Because the actuator rod of jack 7 extends periodically to generate thrust under the action of hydraulic actuator, the force generated is large and difficult to control. Therefore, the separation process of booster stage 1 and fan shaft 2 is difficult to control. This may result in the booster stage 1 moving too far at the moment of detachment, or even colliding with other parts, damaging the booster stage and other components.

[0005] 2. Since the separation of the fan shaft 2 from the booster stage 1 is achieved by the jack 7 pushing the top tool cylinder 8 which is pushed on the low-pressure turbine shaft 3, the existing tooling disassembly scheme cannot be applied to the case where the low-pressure turbine shaft 3 is missing.

[0006] 3. Because the jack 7 applies force to the support plate 6 during disassembly, when the booster stage 1 is separated from the fan shaft 2, the force applied to the booster stage 1 is at the bolt 5 connection, rather than at the interference fit between the booster stage 1 and the fan shaft 2. This results in a poor force application position when disassembling the booster stage 1, requiring a large force to separate it. Excessive disassembly force may damage the machine parts. Summary of the Invention

[0007] To address the aforementioned problems, this application provides a disassembly fixture for the booster stage of an aero-engine, mainly comprising:

[0008] The main support is a cylinder structure, and a circular arc support cylinder is arranged at the rear end of the main support, used for abutting against the inner wall surface of the fan shaft of the engine; a disc is formed at the front end of the main support, and a front clamping block is fitted on the disc in an interference fit, and the front end of the front clamping block is provided with a ring edge, used for abutting against the front side of the rib plate of the fan shaft; the outer wall of the fan shaft is slotted, and a plurality of anti-rotation blocks are fixed on the outer wall in the circumferential direction, used for being embedded in the rib plate slot of the rib plate of the fan shaft; an arc-shaped hole is formed in the disc at the front end of the main support, and a tension bolt passes through the arc-shaped hole from the front end surface of the disc of the main support, and is connected with a rear clamping block at the rear end surface of the disc; a plurality of bosses are arranged on the rear clamping block, used for passing through the rib plate slot of the fan shaft, and after passing through the rib plate slot of the fan shaft, the tension bolt is rotated along the arc-shaped hole, so that the bosses abut against the rear side of the rib plate of the fan shaft; and the rear clamping block and the front clamping block jointly clamp the rib plate.

[0009] The central support shaft is rotatably arranged in the cylinder of the main support, and a coaxial driving extension rod is connected to the front end of the central support shaft.

[0010] The cross-shaped rotating frame comprises a shaft threadedly connected to the central support shaft and four tracks extending radially on the outer wall of the shaft in a cross shape; a sector-shaped sliding block is slidably arranged in each track, and the sector-shaped sliding block is fixed at the proximal end or the distal end of the shaft by a contraction positioning pin; and the end of the sector-shaped sliding block is provided with a stop opening, used for abutting against the rear end surface of the turbocharged stage to be disassembled.

[0011] Preferably, the circular arc support cylinder has a circular arc surface matched with the inner wall surface of the fan shaft, and is made of polytetrafluoroethylene material.

[0012] Preferably, a through hole is formed in the rear clamping block, and a D-shaped nut is connected to the tension bolt after the tension bolt passes through the through hole of the rear clamping block, and the straight edge of the D-shaped nut is press-fitted on the outer wall of the cylinder at the rear end of the disc of the main support.

[0013] Preferably, a front thrust sliding ring and a rear thrust sliding ring are arranged between the inner wall of the cylinder of the main support and the central support shaft, the front end and the rear end of the front thrust sliding ring are fixed by the shaft shoulder of the central support shaft and the front shaft shoulder of the inner wall of the cylinder of the main support respectively, and the front end and the rear end of the rear thrust sliding ring are fixed by the rear shaft shoulder of the inner wall of the cylinder of the main support and the compression nut arranged at the end of the central support shaft respectively.

[0014] Preferably, a positioning pin hole is formed at the proximal end and the distal end of the cross-shaped rotating frame respectively, and the sector-shaped sliding block is fixed on the track by a contraction positioning pin inserted into the positioning pin hole.

[0015] Preferably, the driving extension rod and the central support shaft are hollow shafts.

[0016] Preferably, a square slot is arranged at the front end of the driving extension rod away from the central support shaft, used for mounting a square head wrench.

[0017] Preferably, the front end of the driving extension rod is also provided with a radial perforation, when the auxiliary installation hanger is installed, the quick pin passes through the radial perforation, and then the auxiliary installation hanger is fixed with the driving extension rod.

[0018] The application avoids the collision with the machine parts when the supercharging stage is disassembled, and the operation is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic diagram of the use of the existing aviation engine supercharging stage disassembly tool.

[0020] Figure 2 is a schematic diagram of the disassembly tool installation of a preferred embodiment of the aviation engine supercharging stage disassembly tool of the application.

[0021] Figure 3 is Figure 2 is a perspective view of the disassembly tool of the embodiment shown.

[0022] Figure 4 is a schematic diagram of the rib plate and rib plate groove of the fan shaft.

[0023] Among them, 1 - supercharging stage, 2 - fan shaft, 201 - rib plate, 202 - rib plate groove, 3 - low pressure turbine shaft, 4 - low pressure turbine shaft head nut, 5 - bolt, 6 - support plate, 7 - jack, 8 - top tool cylinder, 9 - circular arc support cylinder, 10 - main support, 11 - front clamping block, 12 - anti-rotation block, 13 - rear clamping block, 131 - boss, 14 - D-shaped nut, 15 - tension bolt, 16 - front thrust sliding ring, 17 - rear thrust sliding ring, 18 - adjusting washer, 19 - compression nut, 20 - center support shaft, 21 - cross rotating frame, 22 - fan-shaped sliding block, 23 - contraction positioning pin, 24 - driving extension rod, 25 - auxiliary installation hanger, 26 - quick pin. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the application clearer, the technical scheme of the embodiment of the application will be described in more detail below in combination with the drawings in the embodiment of the application. In the drawings, the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are part of the embodiments of the application, not all of the embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the application, and cannot be understood as a limitation of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application. The embodiments of the application will be described in detail below in combination with the drawings.

[0025] This application provides a tooling for disassembling the booster stage of an aero-engine, such as... Figures 2-3 As shown, it mainly includes:

[0026] The main support 10 is a cylindrical structure with an arc-shaped support cylinder 9 at the rear end to fit against the inner wall of the fan shaft 2 of the engine. The front end forms a disc, and a front clamping block 11 is interference-fitted onto the outside of the disc. The front clamping block 11 has a ring edge at its front end for fitting against the front side of the stiffener 201 of the fan shaft 2. The outer wall of the fan shaft 2 is slotted, and multiple anti-rotation blocks 12 are fixed circumferentially to embed into the stiffener grooves 202 of the stiffener 201 of the fan shaft 2. The disc at the front end of the main support 10 has an opening... The front end face of the self-supporting disc of the tension bolt 15 passes through the arc-shaped hole and is connected to the rear end face of the disc. The rear clamping block 13 is provided with multiple bosses 131 for passing through the rib groove 202 of the fan shaft 2. After passing through the rib groove 202 of the fan shaft 2, the tension bolt 15 is rotated along the arc-shaped hole so that the bosses 131 fit against the rear side of the rib 201 of the fan shaft 2. The rear clamping block 13 and the front clamping block 11 clamp the rib 201 together.

[0027] The central support shaft 20 is rotatably installed inside the cylinder of the main support 10, and a coaxial drive extension rod 24 is connected to the front end of the central support shaft 20.

[0028] The cross-shaped rotating frame 21 includes a shaft threadedly connected to a central support shaft 20 and four cross-shaped tracks extending radially along the outer wall of the shaft. Each track has a slidable fan-shaped slider 22, which is fixed at the near or far end of the shaft by a retractable positioning pin 23. The end of the fan-shaped slider 22 has a stop for fitting against the rear end face of the booster stage 1 to be disassembled.

[0029] Figures 2 to 3 In the diagram, the left side is defined as the front end and the right side as the rear end. The front clamping block 11 and the rear clamping block 13 on the main support 10 are used to clamp the stiffening plate 201 of the fan shaft, as shown below. Figure 4 As shown, eight rib grooves 202 are formed circumferentially on the inner wall of the rib plate 201 of the fan shaft. When the disassembly fixture of this application is used, the protrusion at the front end of the front clamping block 11 is located on the front side of the rib plate 201. Four anti-rotation blocks 12 are provided on the front clamping block 11 and fall into the four spaced-apart rib grooves 202. The rear clamping block 13 moves to the rear end of the rib plate 201, and the boss 131 on the rear clamping block 13 can just pass through the other four spaced-apart rib grooves 202. Figure 3 and Figure 4It can be seen that the four anti-rotation blocks 12 and the four bosses 131 are spaced 45° apart in the circumferential direction at this time, then the driving tension bolt 15 is turned through an angle along the arc-shaped hole, thereby driving the four bosses 131 of the rear clamping block 13 to turn through an angle (the angle is a fixed value controlled by the arc-shaped hole on the main support 10), and the bosses 131 are turned to the position where the rib plate 201 of the fan shaft 2 has no opening, then the tension bolt 15 is tightened, thereby ensuring that the dismounting tool is fixed on the fan shaft 2.

[0030] The above is the connection and fixation of the main support 10 of the dismounting tool and the fan shaft 2, in addition, the cross-shaped rotating frame 21 also needs to be connected and fixed with the supercharging stage 1, referring to Figure 2 The fan-shaped sliding block 22 is installed on the cross-shaped rotating frame 21 and slides radially, in the initial installation, the fan-shaped sliding block 22 is located at the proximal end and is locked by the contraction positioning pin 23, when the main support 10 is fixed with the fan shaft 2, the contraction positioning pin 23 is unlocked, the fan-shaped sliding block 22 is pushed radially outward to the distal end, and is locked by the contraction positioning pin 23, at this time, the outer edge stop of the fan-shaped sliding block 22 will be attached to the rear end face of the supercharging stage 1 to be dismounted, thereby when the cross-shaped rotating frame 21 moves forward, the rear end face of the supercharging stage 1 can be pushed to move forward.

[0031] In this embodiment, the inner thread is processed at the center hole of the cross-shaped rotating frame 21, and the outer thread is processed on the center support shaft 20, the above-mentioned inner and outer threads are matched with each other, the cross-shaped rotating frame 21 can move in the axial direction on the center support shaft 20, when the above-mentioned device is installed, the cross-shaped rotating frame 21 is driven to move axially relative to the main support 10, at this time, the cross-shaped rotating frame 21 drives the supercharging stage 1 to separate from the fan shaft 2, thereby realizing the dismounting of the supercharging stage 1.

[0032] In some optional embodiments, the circular arc support cylinder 9 has a circular arc surface matched with the inner wall surface of the fan shaft 2, and is made of polytetrafluoroethylene material.

[0033] In this embodiment, the material of the circular arc support cylinder 9 is polytetrafluoroethylene, and the matched surface with the fan shaft 2 is designed as a circular arc, so as to ensure good attachment with the fan shaft 2 and prevent bumping the inner surface of the fan shaft 2.

[0034] In some optional embodiments, the rear clamping block 13 is provided with a through hole, the tension bolt 15 passes through the through hole on the rear clamping block 13, and then the D-shaped nut 14 is connected, and the straight edge of the D-shaped nut 14 is pressed on the outer wall of the cylinder body at the rear end of the disc of the main support 10.

[0035] In this embodiment, the tension bolt 15 can be controlled on the front end surface of the main support 10, so as to realize the fastening of the rear clamping block 13.

[0036] In some alternative embodiments, the front and rear thrust sliding rings 16 and 17 are arranged between the inner wall of the main support 10 cylinder and the central support shaft 20. The front end of the front thrust sliding ring 16 is fixed by the shaft shoulder of the central support shaft 20, and the rear end is fixed by the front shaft shoulder of the inner wall of the main support 10 cylinder. The front end of the rear thrust sliding ring 17 is fixed by the rear shaft shoulder of the inner wall of the main support 10 cylinder, and the rear end is fixed by the compression nut 19 installed at the end of the central support shaft 20. In this embodiment, the front and rear thrust sliding rings 16 and 17 are used to realize the rotational connection between the main support 10 and the central support shaft 20. The rear end of the central support shaft 20 is processed with corresponding threads to install the adjusting washer 18 and the compression nut 19.

[0037] In some alternative embodiments, the cross-rotating frame 21 is formed with a positioning pin hole at the proximal and distal shaft ends, respectively. After the contraction positioning pin 23 is inserted into the positioning pin hole, the sector-shaped sliding block 22 is fixed on the track.

[0038] In this embodiment, when the sector-shaped sliding block 22 is at the proximal shaft end, it is locked in a pin hole at the proximal shaft end by the contraction positioning pin 23. When the sector-shaped sliding block 22 needs to move outward, the contraction positioning pin 23 is unlocked, the sector-shaped sliding block 22 is pushed radially outward to the distal shaft end, and is locked in the pin hole at the distal shaft end by the contraction positioning pin 23.

[0039] In some alternative embodiments, the driving extension rod 24 and the central support shaft 20 are hollow shafts. In this embodiment, the driving extension rod 24 and the central support shaft 20 are designed as hollow to reduce the weight of the disassembly tool itself.

[0040] In some alternative embodiments, the front end of the driving extension rod 24 away from the central support shaft 20 is provided with a square slot for installing a square head wrench. In this embodiment, when operating, a general square head wrench is inserted into the square slot at the left end of the driving extension rod 24 to rotate, which can drive the central support shaft 20 to rotate together.

[0041] In some alternative embodiments, the front end of the driving extension rod 24 is also provided with a radial perforation. When the auxiliary installation lifting device 25 is installed at the end of the driving extension rod 24, the quick pin 26 passes through the radial perforation to fix the auxiliary installation lifting device 25 and the driving extension rod 24.

[0042] In this embodiment, the auxiliary installation lifting device 25 can be inserted onto the driving extension rod 24 and locked by the quick pin 26, which is convenient for the crane to lift and install the disassembly tool onto the engine.

[0043] Compared with the prior art, the application has the following advantages:

[0044] 1. The tooling of this application utilizes the rotational motion of the central support shaft 20 to achieve uniform separation of the booster stage 1 and the fan shaft 2. This disassembly process is easy to control and convenient for workers to operate. In addition, there is no situation where the instantaneous movement distance of the booster stage 1 and the fan shaft 2 is too large when they are separated, thus avoiding the problem of collision between the machine parts.

[0045] 2. The disassembly fixture of this application has an arc-shaped support cylinder 9 supporting the fan shaft 2. Regardless of whether the low-pressure turbine shaft 3 is present, the supercharger stage 1 can be separated from the fan shaft 2, solving the problem that the supercharger stage 1 cannot be disassembled when the engine fan shaft 3 is absent. In addition, since all components of the disassembly fixture in contact with the fan shaft 2 are made of polytetrafluoroethylene, it will not damage the surface coating of the fan shaft 2.

[0046] 3. The disassembly fixture of this application applies a pushing force to the booster stage 1 simultaneously through four sector sliders 22 during disassembly. Therefore, when the booster stage 1 is separated from the fan shaft 2, the force application position on the booster stage 1 is the interference fit between the booster stage 1 and the fan shaft 2. The force distribution is good. Compared with other force application positions, the tooling of this application requires less force to disassemble the fan shaft 1, which is convenient to operate and avoids the risk of large disassembly forces damaging the machine parts.

[0047] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An aeroengine booster stage disassembly tool, characterised in that, include: The main support (10) is a cylindrical structure with an arc support cylinder (9) at the rear end for fitting the inner wall of the fan shaft (2) of the engine. The front end forms a disc, and a front clamping block (11) is interference-fitted onto the outside of the disc. The front clamping block (11) has a ring edge at the front end for fitting against the front side of the stiffener (201) of the fan shaft (2). The outer wall of the fan shaft (2) is slotted, and multiple anti-rotation blocks (12) are fixed circumferentially on the front clamping block (11) for embedding into the stiffener groove (202) of the stiffener (201) of the fan shaft (2). The disc at the front end of the main support (10) is opened The front end face of the disc with the arc-shaped hole and the self-supporting (10) of the tension bolt (15) passes through the arc-shaped hole and is connected to the rear end face of the disc. The rear clamping block (13) is provided with multiple bosses (131) for passing through the rib groove (202) of the fan shaft (2). After passing through the rib groove (202) of the fan shaft (2), the tension bolt (15) is rotated along the arc-shaped hole so that the bosses (131) fit against the rear side of the rib (201) of the fan shaft (2). The rear clamping block (13) and the front clamping block (11) clamp the rib (201) together. The central support shaft (20) is rotatably set inside the cylinder of the main support (10), and a coaxial drive extension rod (24) is connected to the front end of the central support shaft (20). The cross-shaped rotating frame (21) includes a shaft threaded onto a central support shaft (20) and four cross-shaped rails extending radially along the outer wall of the shaft. Each rail has a slidable fan-shaped slider (22). The fan-shaped slider (22) is fixed at the near-shaft end or the far-shaft end by a shrinking positioning pin (23). The end of the fan-shaped slider (22) has a stop for fitting against the rear end face of the booster stage (1) to be disassembled. The rear clamping block (13) has a through hole. After the tensioning bolt (15) passes through the through hole on the rear clamping block (13), it is connected to the D-type nut (14). The straight edge of the D-type nut (14) is pressed against the outer wall of the cylinder at the rear end of the main support (10). A front thrust sliding ring (16) and a rear thrust sliding ring (17) are provided between the inner wall of the main support (10) cylinder and the central support shaft (20). The front and rear ends of the front thrust sliding ring (16) are fixed by the shoulder of the central support shaft (20) and the front shoulder of the inner wall of the main support (10) cylinder, respectively. The front and rear ends of the rear thrust sliding ring (17) are fixed by the rear shoulder of the inner wall of the main support (10) cylinder and the clamping nut (19) installed at the end of the central support shaft (20), respectively.

2. The aeroengine booster stage disassembly tool of claim 1, wherein, The arc support cylinder (9) has an arc surface that matches the inner wall surface of the fan shaft (2) and is made of polytetrafluoroethylene material.

3. The aeroengine booster stage disassembly tool of claim 1, wherein, The cross-shaped rotating frame (21) has a positioning pin hole at the near-axis end and the far-axis end respectively. After the retracting positioning pin (23) is inserted into the positioning pin hole, the fan-shaped slider (22) is fixed on the track.

4. The turbine engine booster stage disassembly tool of claim 1, wherein, The drive extension rod (24) and the central support shaft (20) are hollow shafts.

5. The aero-engine booster stage disassembly fixture as described in claim 4, characterized in that, The front end of the drive extension rod (24) away from the central support shaft (20) is provided with a square groove for installing a square head wrench.

6. The aero-engine booster stage disassembly fixture as described in claim 5, characterized in that, The front end of the drive extension rod (24) is also provided with a radial through hole. When the auxiliary installation hanger (25) is installed at the end of the drive extension rod (24), the quick-release pin (26) passes through the radial through hole and fixes the auxiliary installation hanger (25) to the drive extension rod (24).

Images