An auxiliary tooling for the aerodynamic shaping of the aircraft engine inlet

Abstract

An auxiliary tooling for the aerodynamic shaping of the aircraft engine inlet duct adjusts the distance between the upper connecting arm and the lower connecting arm through a longitudinal adjusting device, so as to ensure that the lower end of the scraper contacts the inner wall of the engine inlet duct. The fixed arm can be laterally shifted through a lateral adjusting mechanism, so that the scraper can be moved to the working position. Since the engine inlet duct is an inclined plane, the deflection angle of the scraper can be adjusted through an angle adjusting device to ensure that the lower end surface of the scraper fully contacts the inner wall of the engine inlet duct. The upper connecting arm and the support rod are connected through a rotating connecting device, so that the scraper can rotate around the support rod, thereby shaping the part coated with aerodynamic glue in the circumferential direction, improving the efficiency, ensuring the accuracy of the engine aerodynamic seal, and guaranteeing the safe operation of the aircraft.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft maintenance, and particularly relates to an auxiliary tool for aerodynamic shaping of an aircraft engine air intake duct. Background Art

[0002] The structure around the engine blades in the engine air intake duct is a structure composed of a special sealant to meet the special requirements of engine aerodynamics. However, since this area is in the core area inside the engine and in a high wind speed and high vibration area, the aerodynamic sealant structure at this place is prone to vibrate and fall off or be knocked off by foreign objects. After damage, it will affect the overall aerodynamics of the engine and requires a stop for repair. When repairing this place, only manual repair can be carried out on the damaged part. Although it meets the requirements of the construction process standards, there is still a difference from the original state at the factory in terms of accuracy. And during the construction process, due to the lack of auxiliary tools, the construction technology requirements for the staff are relatively high, the operation process efficiency is low, and repeated calibration and trimming are required, consuming a lot of time. Summary of the Invention

[0003] In order to overcome the above deficiencies in technology, the present invention provides an auxiliary tool that improves the work efficiency and accuracy of aerodynamic shaping of the engine bonding material structure around the blades of the aircraft air intake duct.

[0004] The technical solution adopted by the present invention to overcome its technical problems is as follows:

[0005] An auxiliary tool for aerodynamic shaping of an aircraft engine air intake duct, comprising:

[0006] A bracket fixing plate, with a support rod coaxially arranged at its outer end;

[0007] An upper connecting arm, whose upper end is rotatably connected to the head end of the support rod through a rotating connecting device;

[0008] Three support arms, which are arranged at intervals along the circumferential direction. The inner ends of each support arm are installed at the inner end of the bracket fixing plate through an adjusting mechanism. The support arms can adjust the angle along the circumferential direction through the adjusting mechanism. An installation hole is provided at the outer end of the support arm, and after a bolt II passes through the installation hole, it is fixed in the screw hole of the engine front cone of the engine air intake duct;

[0009] A lower connecting arm, with a sliding hole provided at its lower end along the horizontal direction. The lower end of the upper connecting arm is connected to the upper end of the lower connecting arm through a longitudinal adjusting device, and the longitudinal adjusting device is used to adjust the distance between the upper connecting arm and the lower connecting arm;

[0010] A fixing arm, with a guide rod installed on one side thereof. The guide rod is slidably installed in the sliding hole at the lower end of the lower connecting arm, and a transverse adjusting mechanism is used to adjust the horizontal position of the fixing arm; and

[0011] The scraping plate is connected to the fixed arm through an angle adjusting device, which is used to adjust the angle of the scraping plate so that the lower end surface of the scraping plate is in surface contact with the inner wall of the engine air intake duct.

[0012] Further, the above-mentioned rotational connection device includes a smooth shaft end coaxially arranged at the head end of the support rod and a threaded end coaxially arranged at the head end of the smooth shaft end. A bearing is installed at the upper end of the upper connecting arm. The smooth shaft end passes through the inner hole of the bearing, and a nut is screwed onto the threaded end to axially lock and fix the support rod relative to the upper connecting arm.

[0013] Further, the above-mentioned adjusting mechanism includes three arc-shaped track grooves arranged at intervals along the circumferential direction on the inner side end of the support bracket fixed disk with the center of the support bracket fixed disk as the center of the circle, and a main body fixed disk. Three arc-shaped track grooves are arranged at intervals along the circumferential direction on the inner side end of the main body fixed disk. An arc-shaped slider is arranged at the inner side end of the support arm. The front and rear ends of the slider are respectively clamped in the track grooves of the support bracket fixed disk and the main body fixed disk. A number of bolts Ⅰ pass through the support bracket fixed disk and are then screwed into the main body fixed disk.

[0014] Further, the above-mentioned longitudinal adjusting device includes a connecting frame in the shape of a rectangular frame structure, a sliding sleeve Ⅰ arranged at the upper end of the connecting frame, and a sliding sleeve Ⅱ arranged at the lower end of the connecting frame. A track groove Ⅰ is arranged along the length direction on the side end of the upper connecting arm, and a track groove Ⅱ is arranged along the length direction on the side end of the lower connecting arm. The lower end of the upper connecting arm is slidably inserted into the sliding sleeve Ⅰ, and a set screw Ⅰ is screwed into the sliding sleeve Ⅰ and the bolt head of the set screw Ⅰ is inserted into the track groove Ⅰ. The upper end of the lower connecting arm is slidably inserted into the sliding sleeve Ⅱ, and a set screw Ⅱ is screwed into the sliding sleeve Ⅱ and the bolt head of the set screw Ⅱ is inserted into the track groove Ⅱ. A screw rod Ⅰ is coaxially arranged at the upper end of the knob Ⅰ, and a screw rod Ⅱ is coaxially arranged at the lower end of the knob Ⅰ. The upper end of the screw rod Ⅰ is in threaded transmission connection with the upper connecting arm, and the lower end of the screw rod Ⅱ is in threaded transmission connection with the lower connecting arm. The thread directions of the screw rod Ⅰ and the screw rod Ⅱ are opposite. Further, the above-mentioned transverse adjusting mechanism includes a knob Ⅱ. A screw rod Ⅲ is coaxially installed on one side of the knob Ⅱ, and a screw rod Ⅳ is coaxially installed on the other side of the knob Ⅱ. The screw rod Ⅳ is in threaded transmission connection with the lower connecting arm, the screw rod Ⅲ is in threaded transmission connection with the fixed arm, and the thread directions of the screw rod Ⅲ and the screw rod Ⅳ are opposite.

[0015] Further, the above-mentioned angle adjusting device includes an ear seat Ⅰ and an ear seat Ⅱ respectively arranged on both sides of the upper end of the scraping plate, a screw rod Ⅴ and a screw rod Ⅵ respectively screwed along the vertical direction at both ends of the fixed arm. A knob Ⅲ is installed at the head end of the screw rod Ⅴ, and a knob Ⅳ is installed at the head end of the screw rod Ⅵ. The lower end of the screw rod Ⅴ is rotatably connected to a hinge seat Ⅰ, and the lower end of the screw rod Ⅵ is rotatably installed with a hinge seat Ⅱ. Long holes are respectively arranged along the horizontal direction on the ear seat Ⅰ and the ear seat Ⅱ. A pin shaft Ⅰ passes through the long hole of the ear seat Ⅰ and is fixed to the lower end of the hinge seat Ⅰ, and a pin shaft Ⅱ passes through the long hole of the ear seat Ⅱ and is fixed to the lower end of the hinge seat Ⅱ.

[0016] The beneficial effects of the present invention are as follows: By adjusting the distance between the upper connecting arm and the lower connecting arm through the longitudinal adjustment device, it is ensured that the lower end of the scraper contacts the inner wall of the engine air intake duct. The fixed arm can be horizontally displaced through the horizontal adjustment mechanism, so that the scraper can be moved to the working position. Since the engine air intake duct is inclined, the deflection angle of the scraper can be adjusted through the angle adjustment device to ensure that the lower end surface of the scraper fully contacts the inner wall of the engine air intake duct. The upper connecting arm and the support rod are connected by a rotating connection device, so the scraper can rotate around the support rod, thereby shaping the part coated with pneumatic glue in the circumferential direction, improving the efficiency, ensuring the accuracy of the engine pneumatic seal, and guaranteeing the safe operation of the aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic three-dimensional structure diagram of the present invention;

[0018] Figure 2 is a schematic structural diagram of the main fixed disk part of the present invention;

[0019] Figure 3 is a schematic diagram of the use state of the present invention;

[0020] Figure 4 is a schematic diagram of the scraper part of the present invention;

[0021] In the figure, 1. Main fixed disk 2. Bracket fixed disk 3. Bracket 4. Mounting hole 5. Bolt I 6. Support rod 7. Nut 8. Connection frame 9. Sliding sleeve I 10. Sliding sleeve II 11. Upper connecting arm 12. Track groove I 13. Set screw I 14. Lower connecting arm 15. Track groove II 16. Set screw II 17. Knob I 18. Screw rod I 19. Screw rod II 20. Knob II 21. Screw rod III 22. Screw rod IV 23. Fixed arm 24. Guide rod 25. Knob III 26. Knob IV 27. Screw rod V 28. Screw rod VI 29. Hinge seat I 30. Hinge seat II 31. Scraper 32. Pin shaft I 33. Pin shaft II 34. Track groove 35. Slide block 36. Optical axis end 37. Threaded end 38. Engine air intake duct 39. Engine front cone 40. Bolt II 41. Ear seat I 42. Ear seat II 43. Long hole. DETAILED DESCRIPTION OF THE INVENTION

[0022] The following will further describe the present invention with reference to the attached Figure 1 to the attached Figure 4 drawings.

[0023] An auxiliary tooling for aerodynamic shaping of an aircraft engine inlet duct, comprising: a bracket fixing plate 2, with a support rod 6 coaxially arranged at its outer end; an upper connecting arm 11, whose upper end is rotatably connected to the head end of the support rod 6 through a rotating connection device; 3 support arms 3, arranged at intervals along the circumferential direction, the inner ends of each support arm 3 are installed at the inner end of the bracket fixing plate 2 through an adjusting mechanism, the support arms 3 adjust the angle along the circumferential direction through the adjusting mechanism, and an installation hole 4 is arranged at the outer end of the support arm 3, and a bolt II 40 passes through the installation hole 4 and is fixed in a threaded hole of the engine front cone 39 of the engine inlet duct 38; a lower connecting arm 14, with a sliding hole arranged horizontally at its lower end, the lower end of the upper connecting arm 11 is connected to the upper end of the lower connecting arm 14 through a longitudinal adjusting device, and the longitudinal adjusting device is used to adjust the distance between the upper connecting arm 11 and the lower connecting arm 14; a fixed arm 23, with a guide rod 24 installed on one side, the guide rod 24 is slidably installed in the sliding hole at the lower end of the lower connecting arm 14, and a transverse adjusting mechanism is used to adjust the horizontal position of the fixed arm 23; and a scraping plate 31, connected to the fixed arm 23 through an angle adjusting device, and the angle adjusting device is used to adjust the angle of the scraping plate 31 so that the lower end face of the scraping plate 31 is in surface contact with the inner wall of the engine inlet duct 38. According to the different positions of the threaded holes on the engine front cone 39 of different aircraft models, the positions of each bracket 3 are adjusted through the adjusting structure. If the radius of the threaded hole changes, brackets 3 of different specifications need to be replaced. Finally, the installation hole 4 is made to coincide with the threaded hole, and the entire auxiliary tooling is installed and fixed by screwing a bolt through the installation hole 4 into the corresponding threaded hole. The distance between the upper connecting arm 11 and the lower connecting arm 14 is adjusted through the longitudinal adjusting device, so as to ensure that the lower end of the scraping plate 31 is in contact with the inner wall of the engine inlet duct 38. The fixed arm 23 can be laterally moved through the transverse adjusting mechanism, so that the scraping plate 31 is moved to the working position. Since the engine inlet duct 38 is an inclined surface, the deflection angle of the scraping plate 31 can be adjusted through the angle adjusting device to ensure that the lower end face of the scraping plate 31 is in full contact with the inner wall of the engine inlet duct 38. The upper connecting arm 11 is connected to the support rod 6 through a rotating connection device, so that the scraping plate 31 can rotate around the support rod 6, thereby shaping the part coated with aerodynamic glue in the circumferential direction, improving the efficiency, ensuring the accuracy of the engine aerodynamic seal, and guaranteeing the safe operation of the aircraft.

[0024] The rotating connection device can be the following structure, which includes a smooth shaft end 36 coaxially arranged at the head end of the support rod 6 and a threaded end 37 coaxially arranged at the head end of the smooth shaft end 36. A bearing is installed at the upper end of the upper connecting arm 11, the smooth shaft end 36 passes through the inner hole of the bearing, and a nut 7 is screwed onto the threaded end 37 to lock and fix the support rod 6 relative to the upper connecting arm 11 axially. The smooth shaft end 36 at the head end of the support rod 6 is rotatably connected to the upper connecting arm 11 by using a bearing, making the rotation process of each support 3 smooth.

[0025] The adjusting mechanism can be structured as follows. It includes three arc-shaped track grooves 34 that are arranged at intervals along the circumferential direction with the center of the bracket fixing disk 2 as the center of the circle on the inner side end of the bracket fixing disk 2, and the main body fixing disk 1. Three arc-shaped track grooves 34 are arranged at intervals along the circumferential direction on the inner side end of the main body fixing disk 1. The inner side end of the support arm 3 is provided with an arc-shaped slider 35. The front and rear ends of the slider 35 are respectively clamped in the track grooves 34 of the bracket fixing disk 2 and the main body fixing disk 1. A number of bolts I 5 pass through the bracket fixing disk 2 and are screwed into the main body fixing disk 1. According to the different screw hole positions of the engine front cone 39 of different models, the position of each support 3 can be adjusted by sliding the slider 35 in the track grooves 34 of the main body fixing disk 1 and the bracket fixing disk 2, so that the mounting hole 4 on the support 3 coincides with the screw hole position of the engine front cone 39. After the adjustment is in place, tighten the bolts I 5 so that the main body fixing disk 1 and the bracket fixing disk 2 cooperate with each other to squeeze and fix the slider 35, realizing the fixation of the position of the support 3.

[0026] The longitudinal adjusting device can be structured as follows. It includes a connecting frame 8 in a rectangular frame structure, a sliding sleeve I 9 arranged at the upper end of the connecting frame 8, and a sliding sleeve II 10 arranged at the lower end of the connecting frame 8. A track groove I 12 is arranged along the length direction on the side end of the upper connecting arm 11, and a track groove II 15 is arranged along the length direction on the side end of the lower connecting arm 14. The lower end of the upper connecting arm 11 is slidably inserted into the sliding sleeve I 9. A set screw I 13 is screwed into the sliding sleeve I 9 and the bolt head of the set screw I 13 is inserted into the track groove I 12. The upper end of the lower connecting arm 14 is slidably inserted into the sliding sleeve II 10. A set screw II 16 is screwed into the sliding sleeve II 10 and the bolt head of the set screw II 16 is inserted into the track groove II 15. The upper end of the knob I 17 is coaxially provided with a screw rod I 18, and its lower end is coaxially provided with a screw rod II 19. The upper end of the screw rod I 18 is in threaded driving connection with the upper connecting arm 11, and the lower end of the screw rod II 19 is in threaded driving connection with the lower connecting arm 14. The thread directions of the screw rod I 18 and the screw rod II 19 are opposite. When longitudinal adjustment is required, rotate the knob I 17, so that the screw rod I 18 and the screw rod II 19 rotate synchronously. Since the thread directions of the screw rod I 18 and the screw rod II 19 are opposite, the upper connecting arm 11 and the lower connecting arm 14 slide inwards or outwards synchronously in the sliding sleeve I 9 and the sliding sleeve II 10 respectively. When sliding, the set screw I 13 plays a guiding role in the track groove I 12, and the set screw II 16 plays a guiding role in the track groove II 15. After the adjustment is in place, tighten the set screw I 13 and the set screw II 16 so that the screw heads are respectively in contact with the bottoms of the corresponding track groove I 12 and track groove II 15, realizing the locking and fixing of the positions of the upper connecting arm 11 and the lower connecting arm 14.

[0027] The horizontal adjustment mechanism can be structured as follows. It includes knob II 20. On one side of knob II 20, screw III 21 is coaxially installed. On the other side, screw IV 22 is coaxially installed. Screw IV 22 is in threaded drive connection with the lower connecting arm 14, and screw III 21 is in threaded drive connection with the fixed arm 23. The thread directions of screw III 21 and screw IV 22 are opposite. When horizontal adjustment is needed, rotate knob II 20, so that screw III 21 and screw IV 22 rotate synchronously. Since the thread directions of screw III 21 and screw IV 22 are opposite, the fixed arm 23 slides horizontally relative to the lower connecting arm 14, and the guide rod 24 slides in the sliding hole, playing a guiding role.

[0028] The angle adjustment device can be structured as follows. It includes ear seat I 41 and ear seat II 42 respectively arranged on both sides of the upper end of the scraper 31, and screw V 27 and screw VI 28 respectively screwed along the vertical direction at both ends of the fixed arm 23. At the head end of screw V 27, knob III 25 is installed. At the head end of screw VI 28, knob IV 26 is installed. The lower end of screw V 27 is rotatably connected to hinge seat I 29, and the lower end of screw VI 28 is rotatably installed with hinge seat II 30. Long holes 43 are respectively arranged horizontally on ear seat I 41 and ear seat II 42. Pin I 32 passes through the long hole 43 of ear seat I 41 and is fixed to the lower end of hinge seat I 29. Pin II 33 passes through the long hole 43 of ear seat II 42 and is fixed to the lower end of hinge seat II 30. When rotating knob III 25 or rotating knob IV 26, screw V 27 or screw VI 28 is respectively driven to rotate. Since screw V 27 is rotatably connected to hinge seat I 29 and screw VI 28 is rotatably connected to hinge seat II 30, hinge seat I 29 or hinge seat II 30 is respectively driven to move in the vertical direction. Long holes 43 are arranged on ear seat I 41 and ear seat II 42 of the scraper 31. By using the long holes 43, they are respectively hinged to hinge seat I 29 through pin I 32 and to hinge seat II 30 through pin II 33. The long holes 43 play a role in matching the phase to prevent interference. By adjusting the different heights of screw V 27 or screw VI 28, the angle deflection of the scraper 31 is realized.

[0029] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An auxiliary tooling for aerodynamic shaping of an aircraft engine inlet duct, characterized in that, it includes: A bracket fixing plate (2), with a strut (6) coaxially arranged at its outer end; An upper connecting arm (11), whose upper end is rotatably connected to the head end of the strut (6) through a rotating connection device; Three support arms (3), arranged at intervals along the circumferential direction. The inner ends of each support arm (3) are installed at the inner end of the bracket fixing plate (2) through an adjusting mechanism. The support arms (3) adjust the angle along the circumferential direction through the adjusting mechanism. An installation hole (4) is provided at the outer end of the support arm (3). After a bolt II (40) passes through the installation hole (4), it is fixed in a threaded hole of the engine front cone (39) of the engine inlet duct (38); A lower connecting arm (14), with a sliding hole arranged horizontally at its lower end. The lower end of the upper connecting arm (11) is connected to the upper end of the lower connecting arm (14) through a longitudinal adjusting device, and the longitudinal adjusting device is used to adjust the distance between the upper connecting arm (11) and the lower connecting arm (14); A fixed arm (23), with a guide rod (24) installed on one side thereof. The guide rod (24) is slidably installed in the sliding hole at the lower end of the lower connecting arm (14), and a transverse adjusting mechanism is used to adjust the horizontal position of the fixed arm (23); and A scraping plate (31), connected to the fixed arm (23) through an angle adjusting device, and the angle adjusting device is used to adjust the angle of the scraping plate (31) so that the lower end surface of the scraping plate (31) is in surface contact with the inner wall of the engine inlet duct (38); The longitudinal adjusting device includes a connecting frame (8) in a rectangular frame structure, a sliding sleeve I (9) arranged at the upper end of the connecting frame (8), and a sliding sleeve II (10) arranged at the lower end of the connecting frame (8). A track groove I (12) is arranged along the length direction of the side end of the upper connecting arm (11), and a track groove II (15) is arranged along the length direction of the side end of the lower connecting arm (14). The lower end of the upper connecting arm (11) is slidably inserted into the sliding sleeve I (9), and a set screw I (13) is screwed into the sliding sleeve I (9) and the bolt head of the set screw I (13) is inserted into the track groove I (12). The upper end of the lower connecting arm (14) is slidably inserted into the sliding sleeve II (10), and a set screw II (16) is screwed into the sliding sleeve II (10) and the bolt head of the set screw II (16) is inserted into the track groove II (15). A screw rod I (18) is coaxially arranged at the upper end of a knob I (17), and a screw rod II (19) is coaxially arranged at its lower end. The upper end of the screw rod I (18) is in threaded transmission connection with the upper connecting arm (11), the lower end of the screw rod II (19) is in threaded transmission connection with the lower connecting arm (14), and the thread directions of the screw rod I (18) and the screw rod II (19) are opposite.

2. The auxiliary tooling for aerodynamic shaping of an aircraft engine inlet duct according to claim 1, characterized in that: The rotation connection device includes an optical axis end (36) coaxially arranged at the head end of the support rod (6) and a threaded end (37) coaxially arranged at the head end of the optical axis end (36). A bearing is installed at the upper end of the upper connecting arm (11). The optical axis end (36) passes through the inner hole of the bearing, and a nut (7) is screwed onto the threaded end (37) to axially lock and fix the support rod (6) relative to the upper connecting arm (11).

3. The auxiliary tooling for the aerodynamic shaping of the aircraft engine inlet according to claim 1, characterized in that: The adjusting mechanism includes three arc-shaped track grooves (34) arranged at intervals along the circumferential direction with the center of the bracket fixing disk (2) as the center on the inner side end of the bracket fixing disk (2) and a main body fixing disk (1). Three arc-shaped track grooves (34) are arranged at intervals along the circumferential direction on the inner side end of the main body fixing disk (1). An arc-shaped slider (35) is arranged at the inner side end of the support arm (3). The front and rear ends of the slider (35) are respectively clamped in the track grooves (34) of the bracket fixing disk (2) and the main body fixing disk (1). A number of bolts I (5) pass through the bracket fixing disk (2) and are then screwed into the main body fixing disk (1).

4. The auxiliary tooling for the aerodynamic shaping of the aircraft engine inlet according to claim 1, characterized in that: The lateral adjusting mechanism includes a knob II (20). A screw rod III (21) is coaxially installed on one side of the knob II (20), and a screw rod IV (22) is coaxially installed on the other side. The screw rod IV (22) is in threaded transmission connection with the lower connecting arm (14), the screw rod III (21) is in threaded transmission connection with the fixed arm (23), and the thread directions of the screw rod III (21) and the screw rod IV (22) are opposite.

5. The auxiliary tooling for the aerodynamic shaping of the aircraft engine inlet according to claim 1, characterized in that: The angle adjusting device includes an ear seat I (41) and an ear seat II (42) respectively arranged on both sides of the upper end of the scraper (31), and screw rods V (27) and screw rods VI (28) respectively screwed along the vertical direction at both ends of the fixed arm (23). A knob III (25) is installed at the head end of the screw rod V (27), a knob IV (26) is installed at the head end of the screw rod VI (28). The lower end of the screw rod V (27) is rotatably connected to a hinge seat I (29), the lower end of the screw rod VI (28) is rotatably installed with a hinge seat II (30). Long holes (43) are respectively arranged along the horizontal direction on the ear seat I (41) and the ear seat II (42). A pin shaft I (32) passes through the long hole (43) of the ear seat I (41) and is fixed to the lower end of the hinge seat I (29), and a pin shaft II (33) passes through the long hole (43) of the ear seat II (42) and is fixed to the lower end of the hinge seat II (30).

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