Device and method for screwing nuts in blind cavity of aero-engine

Abstract

The invention provides an aero-engine blind cavity internal nut screwing device and method, and relates to the field of aero-engine assembling equipment.The aero-engine blind cavity internal nut screwing device comprises a locking and screwing assembly, and the locking and screwing assembly can vertically overturn and stretch into an engine blind cavity; a working gear sleeve is arranged on the locking and screwing assembly, so that the working gear sleeve can rotate and is used for clamping and screwing a nut; compared with the prior art, through vertical overturning of the locking and screwing assembly, the locking and screwing assembly can smoothly enter the blind cavity of the engine, then the locking and screwing assembly located in the blind cavity of the engine is reset to the horizontal state, and at the moment, a nut can be clamped and positioned by a working gear sleeve on the locking and screwing assembly; after the nut and the stud are aligned, the nut and the stud can be screwed through rotation of the working gear sleeve, hands do not need to stretch into an engine blind cavity in the process, and compared with manual screwing, the screwing efficiency is high.

Description

Technical Field

[0001] The invention belongs to the technical field of aero-engine assembly, and particularly relates to a nut tightening device and method in a small space environment inside a blind cavity of an aero-engine. Background Art

[0002] With the development of aircraft engines, existing nuts and studs are installed in pairs, requiring the nuts and studs to correspond one to one to ensure the balanced and stable performance of the fan disk shaft under high-speed rotation.

[0003] like Figure 1 The figure shows a cross-sectional view of the connection portion between the fan disk shaft 1003 and the connecting disk 1004. When assembling the bolts in the rotor blind cavity, the blind cavity needs to be placed vertically as shown in FIG. Figure 1 As shown, the tightening device is then inserted from the upper cavity opening into the blind cavity. Once the nut reaches the assembly position, it is tightened. In some engine models, the inner diameter of the upper cavity opening is ≤ Φ95mm, the axial distance from the lowest point of the blind cavity to the nut to be tightened is ≤ 40mm, and the nut tightening torque required is 92Nm to 98Nm, with an accuracy of ±3%.

[0004] Currently, for such small space working conditions, the nut is usually manually tightened and then locked with special equipment. However, the tightening accuracy is generally ≥±6%, and it is impossible to achieve ≤±3%. If the nut is tightened manually, it is restricted by the assembly environment, has strict requirements on the operator's hand size, and is inefficient. Summary of the Invention

[0005] The object of the present invention is to provide a device and method for tightening nuts inside a blind cavity of an aero-engine, which can accurately control the tightening torque of the nuts and have high tightening efficiency.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is a nut tightening device inside a blind cavity of an aircraft engine, comprising an offset tightening mechanism and a swinging assembly, the swinging assembly being connected to the offset tightening mechanism, the offset tightening mechanism comprising a mounting seat and a suspension sleeve, the suspension sleeve being connected to the mounting seat, a torque transmission rod passing through the suspension sleeve, and a locking assembly being hinged at the lower end of the suspension sleeve; the locking assembly comprising a driving gear and a working gear sleeve, and the two are coupled so that the working gear sleeve can rotate, and the nut is screwed through the working gear sleeve; the locking assembly is connected to a sliding sleeve, the sliding sleeve being connected to the suspension sleeve and capable of vertical movement, and the vertical movement of the sliding sleeve enables the locking assembly to be vertically flipped, and when the locking assembly is in a horizontal state, the driving gear is engaged with the torque transmission rod; The swing assembly includes a swing seat and a connecting seat, the connecting seat is axially connected to the swing seat, and the connecting seat is connected to the biased tightening mechanism. When the connecting seat rotates, the locking assembly moves around the central axis of the working gear sleeve to repeatedly tighten the nut.

[0007] Furthermore, the biased tightening mechanism includes an extension plate, which is arranged on the mounting seat and is used to dock with the connecting seat, so that the working gear sleeve is coaxially arranged with the extension plate and the connecting seat.

[0008] Furthermore, the swing assembly includes a bearing seat, a swing electric push cylinder, a swing rod and a push-pull rod, the bearing seat is arranged on the swing seat; the swing electric push cylinder is connected to the bearing seat and can move around the bearing seat; the swing rod is connected to the connecting seat; the two ends of the push-pull rod are respectively connected to the swing electric push cylinder and the swing rod.

[0009] Furthermore, the swing assembly also includes a torque sensor, which is installed on the connecting seat and docked with the swing rod for feeding back tightening torque data.

[0010] Furthermore, the biased tightening mechanism also includes a connecting rod, which is hinged to the sliding sleeve and the locking assembly, so that when the sliding sleeve moves vertically, it can drive the locking assembly to flip.

[0011] Furthermore, the locking assembly includes a wrench body, the driving gear and the working gear sleeve are both located on the wrench body, and the nut is located in the working gear sleeve.

[0012] Furthermore, the locking assembly (2096) also includes a driven gear, which is arranged on the wrench body and meshes with the driving gear and the working gear sleeve respectively, and is used to make the working gear sleeve and the driving gear rotate synchronously.

[0013] Furthermore, the biased tightening mechanism also includes a tightening gun, the output end of which is connected to the torque transmission rod and can control the lifting and rotation of the torque transmission rod.

[0014] Furthermore, the device also includes a guide rail frame and a rotating base. The guide rail frame is connected to the swing assembly and is used to drive the swing assembly and the offset tightening mechanism to move horizontally; the rotating base is connected to the guide rail frame and can rotate the guide rail frame.

[0015] A method for tightening nuts inside a blind cavity of an aircraft engine, using the above-mentioned device for tightening nuts inside a blind cavity of an aircraft engine, comprises the following steps: Flip and adjust the locking assembly so that it enters the blind cavity opening and flips back to a horizontal state; The nut is clamped by the working gear sleeve, and the horizontal locking assembly is moved so that the nut is located at the upper end of the stud; Control the working gear sleeve to rotate and at the same time control the locking assembly to move downward to screw the nut and stud together; When the nut contacts the workpiece surface, the working gear sleeve stops rotating and the swing assembly works; The locking assembly is first moved clockwise around the central axis of the working gear sleeve to make the nut rotate N times, N<1, and then the locking assembly is controlled to move counterclockwise. During the counterclockwise movement, the nut is in a stationary state. When the locking assembly moves counterclockwise to the initial position, a locking action is completed, and then the above locking action is repeated to tighten the nut.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: by vertically flipping the locking assembly, the locking assembly can be smoothly inserted into the blind cavity of the engine, and then the locking assembly located in the blind cavity of the engine is reset to a horizontal state. At this time, the nut can be clamped and positioned by the working gear sleeve on the locking assembly. After the nut and the stud are aligned, the nut and the stud can be screwed together by rotating the working gear sleeve. During this process, there is no need to reach into the blind cavity of the engine, and compared with manual tightening, the tightening efficiency is higher. When the nut is tightened until it contacts the workpiece surface, the locking assembly is controlled by the swing assembly to swing, simulating the action of manually tightening the nut, thereby improving the torque accuracy when tightening the nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional schematic diagram of the connection portion between the fan disk shaft and the connecting disk in the prior art; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 Schematic diagram of the guide rail frame structure of the present invention; Figure 4 This is a schematic structural diagram of the swing assembly of the present invention from a front side perspective; Figure 5 This is a schematic diagram of the structure of the swing assembly of the present invention from a rear side perspective; Figure 6 It is a schematic structural diagram of the offset tightening mechanism of the present invention; Figure 7 This is a schematic diagram of the connection between the locking and twisting assembly and the suspension sleeve of the present invention; Figure 8 This is a schematic diagram of the structure of an example of a wrench body of the present invention; Figure 9 This is a schematic diagram of the docking of the wrench body and the positioning cover plate of the present invention; Figure 10 This is a schematic diagram of the working gear sleeve structure of the present invention; Figure 11 This is a schematic diagram of the connection between the plug rod and the guide rod of the present invention; Figure 12 This is a schematic diagram of the overall structure of the rotating base of the present invention; Figure 13 It is a schematic diagram of the connection between the base plate and the plane bearing of the present invention.

[0018] Among them, 1003-fan disk shaft, 1004-connecting disk, 201-rotating base, 2011-bottom plate, 2012-plane bearing, 2013-large ring gear, 2014-inner ring docking seat, 2015-guide rail mounting plate, 2016-translational guide rail, 2017-rotating servo motor, 2018-small ring gear, 2021-chassis, 2022-hanging plate, 2023-side support, 2024-center opening, 2025-screw, 2026-Z-axis servo motor, 2027-drive nut, 2028-vertical guide Rail, 2029-guide rail slider, 202-guide rail frame, 203-swing assembly, 2031-swing seat, 2032-slider connecting plate, 2033-swing electric push cylinder, 2034-bearing seat, 2035-push-pull rod, 2036-swing rod, 2037-torque sensor, 2038-connecting seat, 204-translational electric push cylinder, 205-mounting seat, 206-extension plate, 2091-longitudinal slide seat, 2092 - Tightening gun, 2093- Guide slide, 2094- Lifting electric push cylinder, 2095- Torque transmission rod, 2096- Locking assembly, 2097- Hanging support sleeve, 2098- Middle piece, 2099- Sliding sleeve, 20910- Pull plate, 20911- Connecting rod, 20961- Wrench body, 20962- Driving gear, 20963- Working gear sleeve, 20964- Driven gear, 20965- Positioning cover Plate, 20966-ratchet, 20967-positioning electric push cylinder, 20968-block, 209631-inner sleeve, 209632-outer sleeve, 209633-gear ring, 209634-guide rod, 20969-hanging plate, 209635-radial perforation, 3096-plug rod, 3097-reset spring, 3098-positioning ring, 3099-plug head, 3010-waist-shaped mouth, 3011-guide plate. DETAILED DESCRIPTION

[0019] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0021] See Figure 2 As shown, a nut tightening device inside a blind cavity of an aircraft engine includes a rotating base 201 and a guide rail frame 202. The guide rail frame 202 is movably connected to the rotating base 201 so that the guide rail frame 202 can move horizontally on the rotating base 201. A swing assembly 203 is provided on the guide rail frame 202. The swing assembly 203 is connected to a biased tightening mechanism. When the guide rail frame 202 moves, it can drive the swing assembly 203 and the biased tightening mechanism to move, so that the nut can accurately dock with the bolt.

[0022] See Figure 3 and Figure 12 As shown, the guide rail frame 202 includes a chassis 2021 and a hanging plate 2022, and the hanging plate 2022 is connected to the chassis 2021 through a side support 2023. The side support 2023 provides a control area between the hanging plate 2022 and the chassis 2021. A central opening 2024 is provided at the center of the chassis 2021, and the biased tightening mechanism passes through the central opening 2024. The swing assembly 203 is located in the control area, and the biased tightening mechanism is connected to the swing assembly 203. The biased tightening mechanism can be controlled to move in an arc trajectory through the swing assembly 203. A screw rod 2025 is also provided in the control area, and the upper end of the screw rod 2025 is connected to the Z-axis servo motor 2026. When the Z-axis servo motor 2026 rotates, it will drive the screw rod 2025 to rotate. A transmission nut 2027 is screwed on the screw rod 2025. The swing assembly 203 is connected to the transmission nut 2027. At the same time, a vertical guide rail 2028 is provided on the side support member 2023. A guide rail slider 2029 is docked on the vertical guide rail 2028. This guide rail slider 2029 is docked with the swing assembly 203. When the screw rod 2025 rotates, the biased tightening mechanism can be moved vertically, thereby adjusting the horizontal height of the biased tightening mechanism, thereby realizing the adjustment of the horizontal height of the nut in the blind cavity. Regardless of whether the stud is long or short, the nut can be docked with the stud. A connecting block is provided on the chassis 2021, and the connecting block is connected to the translation electric push cylinder 204, which is connected to the rotating base 201. When the output end of the translation electric push cylinder 204 extends or retracts, it can drive the chassis 2021 to translate, and at this time, the position of the offset tightening mechanism can be adjusted; See Figure 3 、 Figure 4 and Figure 5 As shown, the swing assembly 203 includes a swing seat 2031, which is also provided with a center opening. A hole and a slider connecting plate 2032 are also provided on the swing seat 2031. The transmission nut 2027 on the screw rod 2025 is fixed in the hole on the swing seat 2031. The slider connecting plate 2032 is docked with the guide rail slider 2029 on the guide rail frame 202, so that the swing assembly 203 has stability when sliding vertically. The swing assembly 203 also includes a bearing seat 2034 provided on the swing seat 2031. The bearing seat 2034 is connected to a swing electric push cylinder 2033. The swing electric push cylinder 2033 can rotate around the bearing seat 2034. The swing electric push cylinder 2033 is connected to the swing rod 2036 through a push-pull rod 2035. One end of the push-pull rod 2035 The push-pull rod 2035 is docked at the telescopic end of the swing electric push cylinder 2033, and the other end of the push-pull rod 2035 is hinged to the swing rod 2036. When the output end of the swing electric push cylinder 2033 is extended or retracted, the swing rod 2036 can be moved by the push-pull rod 2035, and the free end of the swing rod 2036 is connected to the torque sensor 2037. The torque sensor 2037 is fixed with a connecting seat 2038. The connecting seat 2038 is connected to the swing seat 2031 through bearings and shafts. Therefore, when the swing electric push cylinder 2033 is working, the swing rod 2036 can swing. At this time, the torque sensor 2037 rotates, and then the connecting seat 2038 is driven to rotate by the torque sensor 2037. The torque sensor 2037 provides real-time feedback data to achieve precise control of the torque during the tightening process.

[0023] See Figure 6 and Figure 7As shown, the above-mentioned biased tightening mechanism includes a mounting seat 205, which is connected to the above-mentioned connecting seat 2038. The mounting seat 205 is a square frame. When the swing electric push cylinder 2033 works, it drives the mounting seat 205 to swing. At this time, the mounting seat 205 moves in a circular trajectory. An extension plate 206 for docking with the connecting seat 2038 is provided on the mounting seat 205. A center hole is provided on the extension plate 206. A longitudinal slide seat 2091 is installed on the mounting seat 205. A vertical guide rail is provided on the inner side wall of the mounting seat 205. The end of the longitudinal slide seat 2091 is docked with a guide slider 2093. A tightening gun 2092 and a lifting electric push cylinder 2094 are docked on the longitudinal slide seat 2091. The lifting electric push cylinder 2094 is connected to the longitudinal slide seat 2091. The cylinder 2094 is docked with the mounting seat 205. The vertical sliding seat 2091 can be controlled to move vertically through the lifting electric push cylinder 2094, thereby driving the tightening gun 2092 to move vertically. The output end of the tightening gun 2092 is docked with a torque transmission rod 2095. The tightening gun 2092 can control the lifting and rotation of the torque transmission rod 2095. A locking assembly 2096 for performing tightening operations is provided below the torque transmission rod 2095. When the lower end of the torque transmission rod 2095 is docked with the locking assembly 2096, the locking assembly 2096 can be controlled to work through the torque transmission rod 2095. At this time, the nut is located at the output position of the locking assembly 2096, so that the nut is screwed onto the bolt.

[0024] The locking assembly 2096 is connected to the mounting base 205 via a suspension sleeve 2097. The upper end of the suspension sleeve 2097 is fixedly connected to the mounting base 205. The lower end of the suspension sleeve 2097 is fixed with an intermediate piece 2098. The intermediate piece 2098 is hinged to the locking assembly 2096. The intermediate piece 2098 is provided with a through hole. At this time, the torque transmission rod 2095 passes through the suspension sleeve 2097, and the locking assembly 2096 can now be flipped vertically. Since the diameter of the upper port of the fan disk shaft 1003 is small, in order to facilitate the insertion of the locking assembly 2096 into the blind cavity, it is necessary to first flip the locking assembly 2096 to a nearly vertical state, and then move the locking assembly 2096 to the lower space of the blind cavity, and then control the locking assembly 2096 to flip to a horizontal state. At this time, the nut is assembled on the locking assembly 2096, and the locking assembly 2096 can rotate after working.

[0025] In order to control the locking assembly 2096 to be able to flip, a sliding sleeve 2099 is provided on the support sleeve 2097. The upper end of the sliding sleeve 2099 is connected to a push rod through a pull plate 20910. The push rod is fixed to the auxiliary electric push cylinder. The auxiliary electric push cylinder is installed on the mounting seat 205. The sliding sleeve 2099 can be controlled to move vertically through the auxiliary electric push cylinder. The sliding sleeve 2099 is connected to the locking assembly 2096 through a connecting rod 20911. The connecting rod 20911 is hinged to both. Since the locking assembly 2096 is also hinged to the middle piece 2098 at the lower end of the support sleeve 2097, when the sliding sleeve 2099 moves vertically, the locking assembly 2096 can be controlled to flip and move. When entering, the locking assembly 2096 can be adjusted to a nearly vertical state. After entering the blind cavity of the engine, the locking assembly 2096 can be adjusted to a horizontal state, so that the nut on the locking assembly 2096 can be docked with the bolt.

[0026] See Figure 8 and Figure 9 As shown, the above-mentioned locking assembly 2096 includes a torque wrench and a positioning cover 20965. The positioning cover 20965 is located above the torque wrench. The torque wrench specifically includes a wrench body 20961. The wrench body 20961 is long and has a driving gear 20962 and a working gear sleeve 20963. The driving gear 20962 can be docked with the torque transmission rod. The working gear sleeve 20963 is provided with a spring plunger. The nut is located in the working gear sleeve 20963. At this time, the spring The plunger positions the nut. The driving gear 20962 and the working gear sleeve 20963 are respectively arranged at the two ends of the wrench body 20961 and can rotate. A driven gear 20964 is provided between the driving gear 20962 and the working gear sleeve 20963. The driven gear 20964 meshes with both. That is, when the driving gear 20962 rotates, it can drive the driven gear 20964 to rotate, and then the driven gear 20964 drives the working gear sleeve 20963 to rotate, thereby screwing the nut. The positioning cover 20965 has the same shape as the wrench body 20961. The positioning cover 20965 is provided with a strip groove and a circular groove. A ratchet 20966 is provided in the circular groove. The ratchet 20966 is connected to the upper end of the working gear sleeve 20963. A positioning electric push cylinder 20967 is provided in the strip groove. The output end of the positioning electric push cylinder 20967 is connected to a card block 20968. The positioning electric push cylinder 20967 controls the card block 20968 to move so that the card block 20968 is against the ratchet 20966. At this time, the working gear sleeve 20963 cannot rotate by itself, and then the locking assembly 2096 is controlled to swing. The nut can be screwed, but it should be noted that at this time the working gear sleeve 20963 is coaxially arranged with the extension plate 206 on the mounting seat 205, that is, the locking component 2096 can be controlled to move in an arc trajectory through the swing mechanism, and the arc center of the arc trajectory is located on the central axis of the working gear sleeve 20963. At this time, the locking component 2096 forms a swinging motion posture that imitates manually tightening the nut. After the nut is screwed in the forward direction, the locking component 2096 moves in the reverse direction, and the positioning electric push cylinder 20967 contracts to separate the block 20968 from the ratchet 20966. At this time, the working gear sleeve 20963 can rotate.

[0027] During application, the working gear sleeve 20963 is first rotated by the rotation of the torque transmission rod 2095, and the nut is screwed to the stud. When the nut contacts the surface of the workpiece, the rotation of the torque transmission rod 2095 is stopped. At this time, the mounting seat 205 is controlled to swing by the swing component 203, so that the locking component 2096 swings back and forth around the central axis of the working gear sleeve 20963, driving the nut to rotate in this process. The swing amplitude of the locking component 2096 determines the rotation angle of the nut. In order to simulate the operation of manually tightening the nut, it is convenient to control the tightening torque of the nut so that the accuracy reaches the required ±%. The swing amplitude of the locking component 2096 should not be too large and can be set within the range of -°. In this way, when the locking component 2096 moves clockwise, the nut cannot rotate one circle. During the process of resetting the locking component 2096 counterclockwise, the nut is in a stationary state. In this way, the nut can be tightened in layers to improve the tightening torque accuracy of the nut.

[0028] See Figures 4 to 7 、 Figures 9 to 11As shown, the working gear sleeve 20963 includes an inner sleeve 209631 and an outer sleeve 209632. The outer sleeve 209632 is sleeved on the inner sleeve 209631. A gear ring 209633 is also provided on the inner sleeve 209631. The outer circumferential surface of the gear ring 209633 is provided with convex teeth. The gear ring 209633 is engaged with the driven gear 20964, so that the driving gear 20962 can drive the working gear sleeve 20963 to rotate through the driven gear 20964. A top cap is fixed to the upper end of the inner sleeve 209631, and the ratchet 20966 is docked at the top cap. On the outer sleeve 209632, a guide rod 209634 is fixed, and the guide rod 209634 extends upward. The guide rod 209634 is parallel to the central axis of the outer sleeve 209632. The guide rod 209634 continues to extend upward after passing through the top cap. When the outer sleeve 209632 moves vertically, the guide rod 209634 moves vertically accordingly. A horizontally extending hanging plate 20969 is provided on the positioning cover 20965, and a sensor is provided on the hanging plate 20969. When the nut is screwed, as the nut is screwed, the torque wrench needs to move downward gradually. At this time, the outer sleeve 209632 and the inner sleeve are in contact with each other. The sleeve 209631 moves downward synchronously. After the lower end of the outer sleeve 209632 contacts the surface of the workpiece, as the inner sleeve 209631 continues to move downward, the guide rod 209634 and the inner sleeve 209631 move relative to each other, and the distance between the upper end of the guide rod 209634 and the sensor gradually becomes smaller. When the nut contacts the surface of the workpiece, the upper end of the guide rod 209634 rests on the sensor. At this time, the sensor sends a feedback signal to the tightening gun 2092 and the first electric push cylinder, so that the tightening gun 2092 controls the torque transmission rod 2095 to separate from the driving gear 20962. At this time, the working gear sleeve The cylinder 20963 stops rotating, and the swinging electric push cylinder 2033 starts to extend and retract, thereby causing the swinging assembly 203 to control the support sleeve 2097 to move in a circular motion. When the support sleeve 2097 moves forward, the block 20968 abuts against the ratchet 20966, and the nut can be screwed at this time. When the support sleeve 2097 is controlled by the swinging assembly 203 to move in the reverse direction, the block 20968 separates from the ratchet 20966, and the working gear sleeve 20963 cannot rotate at this time, so that the nut can be tightened in stages, which facilitates the control of the tightening torque of the nut and ensures that the required accuracy is achieved.

[0029] A radial through-hole 209635 is provided on the inner sleeve 209631. The spring plunger passes through the radial through-hole 209635. The spring plunger includes a plug rod 3096 and a return spring 3097. A positioning ring 3098 is sleeved on the plug rod 3096. The positioning ring 3098 is fixed in the radial through-hole 209635. A plug head 3099 is fixed on the inner end of the plug rod 3096. The plug head 3099 can be located in the through-hole. The return spring 3097 is sleeved on the plug rod 3096. 096, and a return spring 3097 is located between the plug head 3099 and the positioning ring 3098. The restoring force of the return spring 3097 can drive the plug head 3099 to move inwardly of the inner sleeve 209631. When the nut is located in the inner sleeve 209631 and presses the plug head 3099, forcing the plug head 3099 to move into the radial through-hole 209635, the return spring 3097 is compressed, and the nut is positioned through the plug head 3099. A waist-shaped opening 3010 is provided on the plug rod 3096, which is close to the outer end of the plug rod 3096 and is located on the outside of the inner sleeve 209631. The guide rod 209634 passes through the waist-shaped opening 3010 on the plug rod 3096. A guide plate 3011 is provided on the guide rod 209634. The upper end of the guide plate 3011 is inclined. After the guide rod 209634 moves upward, the upper end of the guide plate 3011 gradually enters the waist-shaped opening. In this process, the plug rod 3096 is gradually moved away from the nut, thereby making it impossible to position the nut, which can facilitate the separation of the nut from the inner sleeve 209631.

[0030] See Figure 2 、 Figure 3 、 Figure 12 and Figure 13As shown, the rotating base 201 includes a circular base plate 2011, an outer conical guide seat is fixed to the lower surface of the base plate 2011, and a plane bearing 2012 is provided on the upper surface of the base plate 2011, wherein the outer ring of the plane bearing 2012 is fixed to the base plate 2011, and a large gear ring 2013 is also fixed on the outer ring of the bearing. The large gear ring 2013 is annular and has convex teeth on the outer circumference. An inner ring docking seat 2014 is fixed to the inner ring of the plane bearing 2012. A guide rail mounting plate 2015 is fixed on the inner ring docking seat 2014. Two strip-shaped translation guide rails 2016 are provided on the guide rail mounting plate 2015. A translation slider is provided on the chassis 2021 of the guide rail frame 202. The translation slider is connected to the translation guide rail 2016 on the guide rail mounting plate 2015, so that the guide rail frame 202 can translate. A rotary servo motor 2017 is fixed on the guide rail mounting plate 2015. The output shaft of the rotary servo motor 2017 is The bottom plate 2011 is connected to a small gear ring 2018 after passing through. The small gear ring 2018 is located below the guide rail mounting plate 2015 and meshes with the large gear ring 2013. When the rotary servo motor 2017 is working, the small gear ring 2018 and the large gear ring 2013 can be used to rotate the guide rail mounting plate 2015, thereby causing the guide rail frame 202 located on the guide rail mounting plate 2015 to move in a circumferential direction. A translation gear is also provided on the guide rail mounting plate 2015. The electric push cylinder 204, the output end of the translation electric push cylinder 204 is connected to the guide rail frame 202, but it should be noted that the translation electric push cylinder 204 can be extended and retracted along the length direction of the translation guide rail 2016. At this time, the translation electric push cylinder 204 can control the guide rail frame 202 to move in a straight line, and then control the movement of the guide rail frame 202 by rotating the base 201, so that the position of the locking component 2096 can be adjusted, and finally the nut to be installed can be accurately matched with the corresponding stud.

[0031] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A nut tightening device inside a blind cavity of an aircraft engine, characterized in that: include: The biased tightening mechanism comprises a mounting seat (205) and a suspension sleeve (2097), wherein the suspension sleeve (2097) is connected to the mounting seat (205), a torque transmission rod (2095) passes through the suspension sleeve (2097), and a locking assembly (2096) is hinged at the lower end of the suspension sleeve (2097); The locking assembly (2096) includes a driving gear (20962) and a working gear sleeve (20963), and the two are coupled to enable the working gear sleeve (20963) to rotate, and the nut is screwed through the working gear sleeve (20963); The locking assembly (2096) is connected to a sliding sleeve (2099), which is connected to the suspension sleeve (2097) and can move vertically. The vertical movement of the sliding sleeve (2099) enables the locking assembly (2096) to be vertically flipped. When the locking assembly (2096) is in a horizontal state, the driving gear (20962) is engaged with the torque transmission rod (2095). a swing assembly (203) connected to the biased tightening mechanism; The swing assembly (203) comprises a swing seat (2031) and a connecting seat (2038), wherein the connecting seat (2038) is axially connected to the swing seat (2031), and the connecting seat (2038) is connected to a biased tightening mechanism. When the connecting seat (2038) rotates, the locking assembly (2096) moves around the central axis of the working gear sleeve (20963) to repeatedly tighten the nut.

2. The nut tightening device for the blind cavity of an aircraft engine according to claim 1, characterized in that: The biased tightening mechanism comprises: The extension plate (206) is arranged on the mounting seat (205) and is used to dock with the connecting seat (2038), so that the working gear sleeve (20963) is coaxially arranged with the extension plate (206) and the connecting seat (2038).

3. The nut tightening device for the blind cavity of an aircraft engine according to claim 2, characterized in that: The swing assembly (203) comprises: A bearing seat (2034) is arranged on the swing seat (2031); A swing electric push cylinder (2033) is connected to the bearing seat (2034) and is capable of moving around the bearing seat (2034); The swing rod (2036) is connected to the connecting seat (2038); The push-pull rod (2035) has two ends connected to the swing electric push cylinder (2033) and the swing rod (2036) respectively.

4. The device for tightening nuts inside blind cavities of aircraft engines according to claim 3, characterized in that: The swing assembly (203) further comprises: The torque sensor (2037) is mounted on the connecting seat (2038) and docked with the swing rod (2036) for feeding back tightening torque data.

5. The device for tightening nuts inside blind cavities of aircraft engines according to claim 4, characterized in that: The biased tightening mechanism further comprises: The connecting rod (20911) is hinged to the sliding sleeve (2099) and the locking assembly (2096), so that when the sliding sleeve (2099) moves vertically, it can drive the locking assembly (2096) to flip.

6. The device for tightening nuts inside blind cavities of aircraft engines according to claim 1, characterized in that: The locking assembly (2096) includes a wrench body (20961), wherein the driving gear (20962) and the working gear sleeve (20963) are both located on the wrench body (20961), and the nut is located in the working gear sleeve (20963).

7. The device for tightening nuts inside blind cavities of aircraft engines according to claim 6, characterized in that: The locking assembly (2096) further includes: The driven gear (20964) is provided on the wrench body (20961) and is respectively engaged with the driving gear (20962) and the working gear sleeve (20963), and is used to make the working gear sleeve (20963) and the driving gear (20962) rotate synchronously.

8. The device for tightening nuts inside blind cavities of aircraft engines according to claim 7, characterized in that: The biased tightening mechanism further comprises: The output end of the tightening gun (2092) is connected to the torque transmission rod (2095) and can control the lifting and rotation of the torque transmission rod (2095).

9. The device for tightening nuts inside blind cavities of aircraft engines according to claim 1, characterized in that: Also includes: The guide rail frame (202) is connected to the swing assembly (203) and is used to drive the swing assembly (203) and the offset tightening mechanism to move in the horizontal direction; The rotating base (201) is connected to the guide rail frame (202) and can rotate the guide rail frame (202).

10. A method for tightening nuts inside a blind cavity of an aircraft engine, applied to the device for tightening nuts inside a blind cavity of an aircraft engine according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: The locking and twisting assembly (2096) is flipped and adjusted so that the locking and twisting assembly (2096) is flipped back to a horizontal state after entering the blind cavity opening; The nut is clamped by the working gear sleeve (20963), and the horizontal locking assembly (2096) is moved so that the nut is located at the upper end of the stud; Control the working gear sleeve (20963) to rotate, and at the same time control the locking assembly (2096) to move downward, so that the nut and the stud are screwed together; When the nut contacts the workpiece surface, the working gear sleeve (20963) stops rotating and the swing assembly (203) operates; The locking assembly (2096) is first moved clockwise around the central axis of the working gear sleeve (20963) to rotate the nut N times, N<1, and then the locking assembly (2096) is controlled to move counterclockwise. During the counterclockwise movement, the nut is in a stationary state. When the locking assembly (2096) moves counterclockwise to the initial position, a locking action is completed, and then the above locking action is repeated to tighten the nut.

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