A split-type anti-dropping disassembly and assembly tool for the borescope plug of an aeroengine

Abstract

This application belongs to the technical field of aeroengine maintenance, and particularly relates to a dismounting and mounting tool for a split anti-drop borescope plug of an aeroengine. The dismounting and mounting tool includes: a first limiting groove and a second limiting groove are respectively arranged at two ends of a wrench adapter; one end of an inner tube is connected to an inner tube end, and the other end is connected to an end nut; the end nut is threadedly connected to a borescope plug screw; an outer sleeve is sleeved outside an inner core, one end of an outer tube is connected to an outer sleeve adapter, and the other end is connected to a socket head; a limiting outer profile surface matching with the second limiting groove is arranged on the outer sleeve adapter; a tightening part is arranged on the outer tube, and the tightening part can be limited by the inner tube end and the end nut to prevent the outer tube from being disconnected from the inner tube; inner sleeve teeth are arranged on the socket head, and the socket head is meshed with a self-locking nut of the borescope plug through the sleeve teeth; a retaining ring is sleeved on the outer tube, and the retaining ring can be limited by the outer sleeve adapter and the socket head to prevent the retaining ring from being disconnected from the outer tube.

Description

Technical Field

[0001] This application belongs to the technical field of aero-engine maintenance, and particularly relates to a split-type anti-drop aero-engine borescope plug disassembly and assembly tool. Background Art

[0002] During the periodic inspection of an aero-engine, it is necessary to perform borescope inspections on high- and low-pressure components through the borescope holes. In the installed state, there may be situations where the aircraft access cover is misaligned with the borescope hole and the disassembly and assembly space is narrow. Maintenance personnel need to complete the disassembly and assembly of the borescope plug between the outer casing of the engine and the aircraft skin through the aircraft access cover, which increases the difficulty of disassembly and assembly of the borescope plug. Especially for engines with double casings and small and medium bypass ratios, the disassembly and assembly of the borescope plug on the inner casing is more difficult. The disassembly and assembly tool needs to penetrate the inner and outer casings in a limited space, which requires high requirements for maintenance personnel, and there may be problems such as the borescope plug falling off and the disassembly and assembly time being too long during the disassembly and assembly process.

[0003] Currently, for self-locking type inner borescope plugs, an inner wrench is generally used for disassembly and assembly. For the situation where the aircraft access cover is misaligned with the borescope hole, if there is a large maintenance access cover, the disassembly and assembly of the borescope plug can be completed by removing the large access cover. The disadvantage of this method is high maintenance man-hours and costs, and low maintenance efficiency; for engines without a large access cover, experienced maintenance personnel are used for disassembly and assembly. The disadvantage of this method is that it has high requirements for the level of maintenance personnel, and there are risks such as the borescope plug falling off and the disassembly and assembly time being too long; if neither method can complete the maintenance work, the design plan is changed or the maintenance point is cancelled through engine-airframe coordination. However, changing the design plan seriously affects the development cycle of the equipment and greatly increases the design cost. Canceling the maintenance point cannot accurately identify the engine status and increases potential safety hazards.

[0004] Therefore, it is desirable to have a technical solution to overcome or at least mitigate at least one of the above-mentioned deficiencies of the prior art. Summary of the Invention

[0005] The purpose of this application is to provide a split-type anti-drop aero-engine borescope plug disassembly and assembly tool to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is as follows:

[0007] A split-type anti-drop aero-engine borescope plug disassembly and assembly tool, comprising:

[0008] An adapter wrench, the adapter wrench includes a wrench adapter, and both ends of the wrench adapter are respectively provided with a first limit groove and a second limit groove, and the first limit groove is used to cooperate with a torque wrench;

[0009] A combined sleeve, the combined sleeve includes an inner core, an outer sleeve and a retaining ring;

[0010] The inner core includes an inner tube end, an inner tube, and an end nut. One end of the inner tube is connected to the inner tube end, and the other end is connected to the end nut. The end nut is threadedly connected to the borescope plug screw.

[0011] The outer sleeve is sleeved outside the inner core. The outer sleeve includes an outer sleeve adapter, an outer tube, and a sleeve head. One end of the outer tube is connected to the outer sleeve adapter, and the other end is connected to the sleeve head. The outer sleeve adapter is provided with a limiting outer profile surface that cooperates with the second limiting groove. The outer tube is provided with a tightening portion that can be limited by the inner tube end and the end nut to prevent the outer tube from disengaging from the inner tube. The sleeve head is provided with inner sleeve teeth, and the sleeve head is engaged with the borescope plug self-locking nut through the sleeve teeth.

[0012] The retaining ring is sleeved on the outer tube and can be limited by the outer sleeve adapter and the sleeve head to prevent the retaining ring from disengaging from the outer tube.

[0013] In at least one embodiment of the present application, the wrench adapter is provided with a flat handle.

[0014] In at least one embodiment of the present application, both the first limiting groove and the second limiting groove are square limiting grooves.

[0015] In at least one embodiment of the present application, a hollow structure is provided in the middle of the wrench adapter, and a pin hole is opened on the inner tube end.

[0016] The adapter wrench further includes a positioning pin. The positioning pin passes through the hollow structure of the wrench adapter and is inserted into the pin hole of the inner tube end.

[0017] In at least one embodiment of the present application, the adapter wrench further includes a chain. One end of the chain is connected to the wrench adapter, and the other end is connected to the positioning pin.

[0018] In at least one embodiment of the present application, the inner tube is welded to the inner tube end, and the inner tube is welded to the end nut.

[0019] In at least one embodiment of the present application, the outer tube is welded to the outer sleeve adapter, and the outer tube is welded to the sleeve head.

[0020] In at least one embodiment of the present application, the retaining ring is provided with a weight-reducing hole.

[0021] The invention has at least the following beneficial technical effects:

[0022] The split-type anti-drop aviation engine borescope plug disassembly and assembly tool of the present application can achieve the disassembly and assembly of the internal borescope plug in a narrow space. On the one hand, it solves the problem of being unable to maintain due to space constraints. On the other hand, it improves the maintenance efficiency, reduces the requirements for maintenance personnel, and solves the problems of easy dropping and too long disassembly and assembly time during the disassembly and assembly of the borescope plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of the split-type anti-drop aviation engine borescope plug disassembly and assembly tool according to an embodiment of the present application;

[0024] Figure 2 is a cross-sectional view of the combined sleeve according to an embodiment of the present application;

[0025] Figure 3 is a schematic diagram of the adapter wrench according to an embodiment of the present application;

[0026] Figure 4 is a schematic diagram of the combined sleeve according to an embodiment of the present application;

[0027] Figure 5 is a schematic diagram of the split-type anti-drop aviation engine borescope plug disassembly and assembly tool according to an embodiment of the present application.

[0028] Wherein:

[0029] 1 - wrench adapter; 2 - positioning pin; 3 - chain; 4 - inner core; 41 - inner tube end; 42 - inner tube; 43 - end nut; 5 - outer sleeve; 51 - outer sleeve adapter; 52 - outer tube; 53 - socket head; 6 - retaining ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To make the purpose, technical solutions and advantages of the implementation of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0031] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present application.

[0032] The following will further elaborate on the present application in conjunction with the Figures 1 to 5 accompanying drawings.

[0033] The present application provides a split-type anti-detachment disassembly and assembly tool for a borescope plug of an aero-engine, including: an adapter wrench and a combined sleeve.

[0034] As Figures 1-2 shown, the adapter wrench includes a wrench adapter 1, and the combined sleeve includes an inner core 4, an outer sleeve 5, and a retaining ring 6. Among them, the inner core 4 includes an inner tube end 41, an inner tube 42, and an end nut 43, and the outer sleeve 5 includes an outer sleeve adapter 51, an outer tube 52, and a socket head 53.

[0035] Specifically, the two ends of the wrench adapter 1 of the adapter wrench are respectively provided with a first limit groove and a second limit groove. The first limit groove is used to cooperate with a torque wrench, and the second limit groove is used to cooperate with the outer sleeve adapter 51.

[0036] In the combined sleeve, one end of the inner tube 42 of the inner core 4 is connected to the inner tube end 41, and the other end is connected to the end nut 43. The end nut 43 is provided with an internal thread, and the borescope plug screw is provided with an external thread. The end nut 43 is threadedly connected to the borescope plug screw. The outer sleeve 5 is sleeved outside the inner core 4. One end of the outer tube 52 is connected to the outer sleeve adapter 51, and the other end is connected to the socket head 53. The outer sleeve adapter 51 is provided with a limit outer profile surface that cooperates with the second limit groove. The outer tube 52 is provided with a tightening portion, and the tightening portion can be limited by the inner tube end 41 and the end nut 43 to prevent the outer tube 52 from disengaging from the inner tube 42. The socket head 53 is provided with internal teeth, and the borescope plug lock nut is provided with external teeth. The socket head 53 is engaged with the borescope plug lock nut through the teeth. The retaining ring 6 is sleeved on the outer tube 52, and the retaining ring 6 can be limited by the outer sleeve adapter 51 and the socket head 53 to prevent the retaining ring 6 from disengaging from the outer tube 52.

[0037] In the preferred embodiment of the present application, as Figure 3As shown, a flat-blade handle is provided on the wrench adapter 1 for easy installation and disassembly. The first limiting grooves and the second limiting grooves at both ends of the wrench adapter 1 are square limiting grooves and are through grooves, and the limiting outer surface on the outer sleeve adapter 51 is a square limiting outer surface. In this embodiment, a hollow structure is provided in the middle of the wrench adapter 1, a pin hole is provided on the inner tube end 41, and the adapter wrench further includes a positioning pin 2. The positioning pin 2 passes through the hollow structure of the wrench adapter 1 and is inserted into the pin hole of the inner tube end 41. The design of the hollow structure of the wrench adapter 1 is on the one hand to ensure sufficient insertion space for the positioning pin 2, and on the other hand to achieve the purpose of weight reduction. Advantageously, in this embodiment, the adapter wrench further includes a chain 3. One end of the chain 3 is connected to the wrench adapter 1, and the other end is connected to the positioning pin 2. The positioning pin 2 can be prevented from falling off through the chain 3.

[0038] In a preferred embodiment of the present application, as Figure 4 shown, the inner tube 42 is welded to the inner tube end 41, and the inner tube 42 is welded to the end nut 43. The outer tube 52 is welded to the outer sleeve adapter 51, and the outer tube 52 is welded to the socket head 53. In this embodiment, a weight reduction hole is provided in the retaining ring 6 to achieve the purpose of weight reduction.

[0039] For the split anti-drop tool for disassembling and assembling the plug of the aero-engine borescope of the present application, the outer tube 52 is a hollow tube with a tightening part provided at one end. The outer diameters of the inner tube end 41 and the end nut 43 are both larger than the inner diameter of the tightening part of the outer tube 52, and the outer diameters of the inner tube 42 and the end nut 43 are both smaller than the inner diameter of the through tube of the outer tube 52 (the inner diameter of the non-tightening part). This structure can ensure that the inner core 4 can rotate and move up and down freely in the outer sleeve 5 while the two do not separate, playing a role in preventing the inner core 4 from falling off. At the same time, in the vertical state, when the combined sleeve works, the coincidence degree of the inner tube 42 and the outer tube 52 is maximally improved, and the length of the tool is maximally shortened.

[0040] For the split anti-drop tool for disassembling and assembling the plug of the aero-engine borescope of the present application, the inner diameter of the retaining ring 6 is larger than the outer diameter of the outer tube 52 and smaller than the maximum outer diameters of the outer sleeve adapter 51 and the socket head 53. This structure can ensure that the retaining ring 6 can move up and down on the outer sleeve 5 but does not fall off. The outer diameter of the retaining ring 6 should be larger than the aperture of the borescope hole, so as to ensure that the retaining ring 6 is always located outside the outer casing when the outer sleeve 5 is inserted into the borescope hole, preventing the outer sleeve 5 from falling between the inner casing and the outer casing.

[0041] For the split anti-drop tool for disassembling and assembling the plug of the aero-engine borescope of the present application, as Figure 5As shown in the figure, when assembling the combined sleeve, first assemble the outer sleeve 5 and the retaining ring 6, and then assemble the inner core 4 and the outer sleeve 5 together. The process of assembling the outer sleeve 5 and the retaining ring 6 is as follows: Weld the outer tube 52 to one of the outer sleeve adapter 51 and the sleeve head 53, then sleeved the retaining ring 6 on the outer tube 52, and then weld the outer tube 52 to the other of the outer sleeve adapter 51 and the sleeve head 53. The process of assembling the inner core 4 and the outer sleeve 5 is as follows: Weld the inner tube 42 and the end nut 43, then insert the welded inner tube 42 and end nut 43 into the outer sleeve 5, ensuring that the inner tube 42 can extend from the outer sleeve adapter 51, and weld the inner tube end 41 and the inner tube 42.

[0042] The disassembly and assembly tool for the split anti-drop plug of the aero-engine borescope of the present application works as follows:

[0043] First, insert the combined sleeve into the borescope hole of the outer casing through the aircraft access panel. At this time, the retaining ring 6 is located outside the outer casing to prevent the combined sleeve from falling between the inner casing and the outer casing. By adjusting the position of the combined sleeve, ensure that the end nut 43 of the inner core 4 is aligned with the plug screw of the borescope. Rotate the inner core 4 to ensure a firm connection between the inner core 4 and the plug screw of the borescope. Then, by adjusting the position of the outer sleeve 5, ensure that the inner teeth of the sleeve head 53 of the outer sleeve 5 are meshed and aligned with the teeth of the self-locking nut of the borescope plug. After that, slip the square limit groove of the wrench adapter 1 of the adapter wrench onto the square limit outer surface of the outer sleeve adapter 51 of the combined sleeve, and remove the self-locking borescope plug by pressing and rotating the adapter wrench. Then, depending on the space size, take out the adapter wrench and the combined sleeve in sequence. Alternatively, insert the positioning pin 2 into the pin hole on the inner tube end 41 of the inner core 4 to take out the disassembly and assembly tool at one time.

[0044] The disassembly and assembly tool for the split anti-drop plug of the aero-engine borescope of the present application realizes the anti-drop function through structural and dimensional design, while minimizing the tool length and reducing the requirement for maintenance space. The present application can solve the problem of poor maintainability of the inner borescope plug caused by trade-off design without changing the original design of the engine or the aircraft, greatly reducing the design cost; it can improve the maintenance efficiency, reduce the maintenance man-hours, and is conducive to the realization of quantitative maintainability indicators; it reduces the requirements for maintenance personnel, solves the problem of easy dropping of the borescope plug, and eliminates the occurrence of secondary maintenance.

[0045] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A split-type anti-dropping disassembly and assembly tool for a borescope plug of an aero-engine, characterized in that, Comprising: An adapter wrench, the adapter wrench includes a wrench adapter (1), and both ends of the wrench adapter (1) are respectively provided with a first limiting groove and a second limiting groove, and the first limiting groove is used to cooperate with a force-limiting wrench; A combined sleeve, the combined sleeve includes an inner core (4), an outer sleeve (5) and a retaining ring (6); The inner core (4) includes an inner tube end (41), an inner tube (42) and an end nut (43), one end of the inner tube (42) is connected to the inner tube end (41), and the other end is connected to the end nut (43); the end nut (43) is threadedly connected to the plugging head screw of the borescope; The outer sleeve (5) is sleeved outside the inner core (4), and the outer sleeve (5) includes an outer sleeve adapter (51), an outer tube (52) and a sleeve head (53), one end of the outer tube (52) is connected to the outer sleeve adapter (51), and the other end is connected to the sleeve head (53); the outer sleeve adapter (51) is provided with a limiting outer profile surface that cooperates with the second limiting groove; the outer tube (52) is provided with a tightening portion, and the tightening portion can be limited by the inner tube end (41) and the end nut (43) to prevent the outer tube (52) from disengaging from the inner tube (42); the sleeve head (53) is provided with inner teeth, and the sleeve head (53) meshes with the self-locking nut of the borescope plugging head through the teeth; The retaining ring (6) is sleeved on the outer tube (52), and the retaining ring (6) can be limited by the outer sleeve adapter (51) and the sleeve head (53) to prevent the retaining ring (6) from disengaging from the outer tube (52).

2. The split anti-drop hole detector plug disassembly and assembly tool for an aero-engine according to claim 1, characterized in that, The wrench adapter (1) is provided with a flat handle.

3. The split anti-dropping disassembly and assembly tool for the borescope plug of an aero-engine according to claim 2, wherein, Both the first limiting groove and the second limiting groove are square limiting grooves.

4. The split anti-drop hole detector plug disassembly and assembly tool for an aero-engine according to claim 1, characterized in that A hollow structure is provided in the middle of the wrench adapter (1), and a pin hole is opened on the inner tube end (41); The adapter wrench further includes a positioning pin (2), and the positioning pin (2) passes through the hollow structure of the wrench adapter (1) and is inserted into the pin hole of the inner tube end (41).

5. The split anti-drop hole detector plug disassembly and assembly tool for an aeroengine according to claim 4, characterized in that, The adapter wrench further includes a chain (3), one end of the chain (3) is connected to the wrench adapter (1), and the other end is connected to the positioning pin (2).

6. The split anti-drop hole detector plug disassembly and assembly tool for an aero-engine according to claim 1, characterized in that The inner tube (42) is welded to the inner tube end (41), and the inner tube (42) is welded to the end nut (43).

7. The split anti-drop hole detector plug disassembly and assembly tool for an aero-engine according to claim 1, characterized in that, The outer tube (52) is welded to the outer sleeve adapter (51), and the outer tube (52) is welded to the sleeve head (53).

8. The split anti-drop hole detector plug disassembly and assembly tool for an aero-engine according to claim 1, wherein The retaining ring (6) is provided with a weight-reducing hole.

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