Aircraft engine blind cavity nut conveying and tightening device

Abstract

The application provides an aero-engine blind cavity nut conveying and tightening device and relates to the field of aero-engine assembly equipment. The device comprises a biasing and tightening mechanism and a nut conveying mechanism, both of which are connected to a mounting seat. The mounting seat is used for bearing the biasing and tightening mechanism and the nut conveying mechanism. The biasing and tightening mechanism can extend into the blind cavity of the engine and is used for connecting the nut with the stud and screwing the nut. The nut conveying mechanism is used for bearing the nut and conveying the nut into the blind cavity of the engine. The mounting seat can move in an arc trajectory through a swing assembly, so that the biasing and tightening mechanism can tighten the nut. Compared with the prior art, the device can convey the nut into the blind cavity of the engine through the nut conveying mechanism. The tightening operation of the nut can be realized by controlling the swing of the lock and tightening assembly or the rotation of the working gear sleeve. In the process, the nut does not need to be manually held and extended into the blind cavity, so that the convenience and operation efficiency of the nut tightening in the blind cavity of the engine can be improved.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine assembly equipment, specifically relating to a blind cavity nut conveying and tightening device for assembling the fan disc shaft connection part of an aero-engine. Background Technology

[0002] With the development of aero engines, existing nuts and studs are all installed in pairs, requiring a one-to-one correspondence between the nuts and studs to ensure the balance and stability of the fan disc shaft under high-speed rotation.

[0003] like Figure 1 The diagram shown is a cross-sectional view of the connection between the fan disc shaft 1003 and the connecting disc 1004. When assembling bolts within the rotor blind cavity, the blind cavity must be placed vertically. Figure 1 As shown, the tightening device is then inserted into the blind cavity from the upper cavity opening. After reaching the assembly position, the nut 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, the diameter of the center circle of the nut is ≤Φ230mm, and the spacing between adjacent nuts is ≤30mm.

[0004] Currently, for such confined spaces, the usual practice is to manually tighten the nuts and then use specialized equipment to secure them. However, existing specialized equipment only achieves the tightening of the nuts; the initial installation of the nuts and studs still requires manual insertion of the nuts into the mating space. This space is very demanding on manual assembly conditions, for example, the space is narrow, requiring workers with small hands to reach into the space and then manually pair and install the nuts and studs. Summary of the Invention

[0005] The purpose of this invention is to provide a nut delivery and tightening device for the blind cavity of an aero-engine, which can conveniently deliver the nut into the blind cavity and facilitate the docking and tightening of the nut with the stud.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is a nut delivery and tightening device for an aero-engine blind cavity, comprising an offset tightening mechanism and a nut delivery mechanism, both of which are connected to a mounting base. The mounting base is used to support the offset tightening mechanism and the nut delivery mechanism. The offset tightening mechanism can extend into the engine blind cavity to connect the nut with the stud and tighten the nut. The nut delivery mechanism is used to carry the nut and deliver the nut to the engine blind cavity, enabling the nut to be positioned on the offset tightening mechanism. The mounting base is connected to a swing component, which enables the mounting base to move in an arc trajectory, thereby tightening the nut by the offset tightening mechanism.

[0007] Furthermore, the offset tightening mechanism includes a locking assembly and a support sleeve. The locking assembly can be vertically flipped and enters the blind cavity to position the nut. The lower end of the support sleeve is hinged to the locking assembly, and the upper end of the support sleeve is fixed to the swing assembly. The locking assembly positions the nut and controls its rotation to achieve tightening.

[0008] Furthermore, the offset tightening mechanism also includes a sliding sleeve and a connecting rod. The sliding sleeve is sleeved on the support sleeve and can move vertically, while the connecting rod 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 rotate.

[0009] Furthermore, the tightening assembly includes a wrench body with a working gear sleeve on the wrench body, so that the nut is located inside the working gear sleeve, and the nut is rotated when the wrench swings.

[0010] Furthermore, the locking assembly also includes a drive gear and a torque transmission rod. The drive gear is mounted on the wrench body and can drive the working gear sleeve to rotate; the torque transmission rod is located inside the support sleeve and is engaged with the drive gear, and can drive the drive gear to rotate.

[0011] Furthermore, the nut conveying mechanism includes a nut feeding assembly and a nut loading assembly. The nut feeding assembly is connected to the mounting base and is used to convey the nut downwards. The nut loading assembly is used to receive the nut and, after driving the nut to move horizontally, enables the nut to move upwards.

[0012] Furthermore, the nut feeding assembly includes a smooth seat connected to the mounting base and capable of translation; a vertically extending rack limiting sleeve is mated on the smooth seat, the rack limiting sleeve has an opening, a longitudinal rack passes through the rack limiting sleeve, the longitudinal rack can move vertically, a telescopic rod is mated at the lower end of the longitudinal rack, the telescopic rod is horizontally set, and a cylindrical protrusion is provided on the telescopic rod to support the nut.

[0013] Furthermore, the nut feeding assembly also includes a third gear located at the upper end of the rack limiting sleeve. The third gear engages with the longitudinal rack and can drive the longitudinal rack to rotate, causing the cylindrical protrusion to move around the longitudinal rack.

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

[0015] Furthermore, the rotating base includes: a base plate, a plane bearing on the base plate, an inner ring mating seat connected to the plane bearing to enable the inner ring mating seat to rotate, a guide rail rod plate connected to the inner ring mating seat, and a translational guide rail on the guide rail mounting plate to connect with the guide rail frame.

[0016] Compared with the prior art, the beneficial effects of this invention are as follows: the nut is transported to the engine blind cavity through the nut conveying mechanism, and then the cylindrical protrusion fixed at the output end of the telescopic rod receives the nut in the rack spring. By controlling the movement of the telescopic rod, the cylindrical protrusion and the nut move in an arc trajectory, moving the nut to below the locking assembly of the offset tightening mechanism. Then, by controlling the longitudinal rack to move upward, the nut is assembled in the working gear sleeve on the locking assembly. Finally, by controlling the swing of the locking assembly or controlling the rotation of the working gear sleeve, the nut can be tightened. During the process, there is no need for manual hand-holding of the nut into the blind cavity, thereby improving the convenience and efficiency of tightening the nut in the engine blind cavity. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the connection between the fan disc shaft and the connecting disc in the prior art;

[0018] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the nut feeding and tightening device of the present invention;

[0020] Figure 4 This is a schematic diagram of the guide rail frame structure of the present invention;

[0021] Figure 5 This is a schematic diagram of the front view structure of the swing assembly of the present invention;

[0022] Figure 6 This is a schematic diagram of the rear view structure of the swing assembly of the present invention;

[0023] Figure 7 This is a schematic diagram showing the connection between the nut conveying mechanism and the offset tightening mechanism of the present invention;

[0024] Figure 8 This is a schematic diagram of the nut feeding assembly structure of the present invention;

[0025] Figure 9 This is a schematic diagram of the structure of the first embodiment of the feed stop of the present invention;

[0026] Figure 10 This is a schematic diagram of the nut feeding assembly structure of the present invention;

[0027] Figure 11This is a schematic diagram of the telescopic rod structure of the present invention;

[0028] Figure 12 This is a schematic diagram of the bias tightening mechanism of the present invention;

[0029] Figure 13 This is a schematic diagram showing the connection between the locking assembly and the support sleeve of the present invention;

[0030] Figure 14 This is a schematic diagram of the first embodiment of the locking assembly of the present invention;

[0031] Figure 15 This is a schematic diagram of a second embodiment of the locking assembly of the present invention;

[0032] Figure 16 This is a schematic diagram of the working gear sleeve structure of the present invention;

[0033] Figure 17 A schematic diagram of the connection between the plug rod and the guide rod of the invention.

[0034] Figure 18 This is a schematic diagram of the overall structure of the rotating base of the present invention;

[0035] Figure 19 This is a schematic diagram showing the connection between the base plate and the planar bearing of the present invention;

[0036] Figure 20 This is a schematic diagram of the engine simulation component structure of the present invention;

[0037] Figure 21 This is a schematic diagram of a second embodiment of the feed stop of the present invention;

[0038] Figure 22 This is a schematic diagram of the baffle structure in a second embodiment of the material stopper of the present invention;

[0039] Figure 23 This is a schematic diagram of the main cross-sectional structure of a third embodiment of the feed stop of the present invention;

[0040] Figure 24 This is a bottom view schematic diagram of a third embodiment of the feed stop of the present invention;

[0041] Figure 25 This is a schematic diagram of the guiding component structure of the present invention;

[0042] Figure 26 This is a schematic diagram of the connection between the outer guide rod and the guide groove of the present invention.

[0043] Among them, 1003-fan disc shaft, 1004-connecting disc, 1-movable control system, 2-nut feeding and tightening device, 201-rotating base, 2011-base plate, 2012 - Surface bearing, 2013 - Large gear ring, 2014 - Inner ring mating seat, 2015 - Guide rail mounting plate, 2016 - Translation guide rail, 2017 - Rotary servo motor, 2018 - Small gear ring, 2021 - Chassis, 2022 - Lifting platform, 2023 - Side support component, 2024 - Center opening, 2025 - Lead screw, 2026 - Z-axis servo motor, 2027 - Transmission nut, 2028 - Vertical guide rail, 2029 - Guide rail slider, 202 - Guide rail frame, 203 - Swing assembly, 2031 - Swing seat, 2032 - Slider connecting plate, 2033 - First electric push cylinder, 2034 - Bearing seat, 2035 - Push-pull rod, 2036 - Swing 2037-Torque Sensor, 2038-Connecting Seat, 204-Transfer Electric Push Cylinder, 205-Mounting Seat, 206-Extension Plate, 2071-First Servo Motor, 2072-First Gear, 2073-Positioning Sleeve, 2074-Rack and Pinion Spring, 2075-Gearbox Housing, 2076-Second Servo Motor, 2077-Rotor, 2078-Baffle, 20781-Columnar Body, 20782-Baffle Plate, 20783-Support Rod, 20784-Pull Rod, 20785-Elastic Pressure Rod, 20791-Baffle Plate, 20792-Baffle Plate, 20790-Baffle Disc, 20793-Notch, 207101-Ring Gear, 20710 2-Locking wheel, 207103-Supporting wheel, 207104-Side notch, 2071021-Locking end, 2071031-Supporting end, 207105-Gear ring, 2081-Second electric push cylinder, 2082-Electric push cylinder mounting plate, 2083-Smooth seat, 2084-Third electric push cylinder, 2085-Third servo motor, 2086-Rack limit sleeve, 2087-Longitudinal rack, 2088-Second gear, 2089-Third gear, 20810-Transfer rack, 20811-Telescopic rod, 20812-Fourth electric push cylinder, 208101-Fixed section, 208102-Telescopic section, 20813-Columnar protrusion, 209 1-Longitudinal slide block, 2092-Tightening gun, 2093-Guide slider, 2094-Lifting electric cylinder, 2095-Torque transmission rod, 2096-Locking assembly, 2097-Support sleeve, 2098-Intermediate component, 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-Sixth electric cylinder locking block, 20968-Locking block, 209631-Inner sleeve, 209632-Outer sleeve, 209633-Gear ring, 209634-Guide rod20969-Hanging plate, 209635-Radial perforation, 3096-Plug rod, 3097-Return spring, 3098-Positioning ring, 3099-Plug head, 3010-Oval opening, 3011-Guide plate, 21001-Guide groove, 21002-Locking protrusion, Engine simulation component, 301-Stator casing simulation component, 302-Inner cone guide seat, 401-Center guide rod, 402-Top plate, 403-Outer guide rod, 404-Locking rod. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] See Figure 2 and Figure 3 As shown, an aero-engine assembly system includes a movable control system 1, an aero-engine blind cavity nut delivery and tightening device 2, and an engine simulator 3. The movable control system 1 includes a movable trolley and an electronic control integrated system. The engine simulator 3 is located on the movable trolley. The fan disc shaft and connecting disc to be connected are installed on the engine simulator 3. Then, the aero-engine blind cavity nut delivery and tightening device 2 is installed on the engine simulator 3. At this time, the aero-engine blind cavity nut delivery and tightening device 2 is located above the fan disc shaft. Then, the electronic control integrated system controls the operation of the aero-engine blind cavity nut delivery and tightening device 2, so that the nut can be delivered into the blind cavity and connected with the bolt. Then, the nut is tightened by the aero-engine blind cavity nut delivery and tightening device 2.

[0047] The nut feeding and tightening device 2 includes a rotating base 201 and a guide rail frame 202. The guide rail frame 202 is movably connected to the rotating base 201, allowing the guide rail frame 202 to move horizontally on the rotating base 201. A swing component 203 is provided on the guide rail frame 202. The swing component 203 is connected to a nut conveying mechanism and an offset tightening mechanism. When the guide rail frame 202 moves, it can drive the nut conveying mechanism and the offset tightening mechanism to move, so that the nut can accurately align with the bolt and tighten the nut.

[0048] See Figure 4 and Figure 18 As shown, the guide rail frame 202 includes a chassis 2021 and a hanging platform 2022. The hanging platform 2022 is connected to the chassis 2021 via a side support 2023. The side support 2023 provides an adjustable area between the hanging platform 2022 and the chassis 2021. A central opening 2024 is provided in the center of the chassis 2021, through which the nut conveying mechanism and the offset tightening mechanism pass. The swing assembly 203 is located within the adjustable area. The nut conveying mechanism and the offset tightening mechanism are connected to the swing assembly 203, which controls the offset tightening mechanism to perform arc-shaped trajectory movement. A lead screw 2025 is also provided within the adjustable area, with a Z-axis servo motor 2026 connected to its upper end. When the Z-axis servo motor 2026 rotates, it drives the lead screw 2025 to rotate. A transmission nut 2027 is screwed onto the lead screw 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 2023. A guide rail slider 2029 is connected to the vertical guide rail 2028. This guide rail slider 2029 is connected to the swing assembly 203. When the lead screw 2025 rotates, it can make the nut conveying mechanism and the offset tightening mechanism move vertically, thereby adjusting the horizontal height of the nut conveying mechanism and the offset tightening mechanism. This allows the nut to be adjusted in the horizontal height within the blind cavity. Regardless of whether the stud extension length is long or short, the nut can be connected to the stud.

[0049] A connecting block is provided on the chassis 2021, and the connecting block is connected to a translation electric push cylinder 204. The translation electric push cylinder 204 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.

[0050] See Figure 4 , Figure 5 and Figure 6As shown, the swing assembly 203 includes a swing base 2031, which also has a center opening. The swing base 2031 also has a hole and a slider connecting plate 2032. A transmission nut 2027 on the lead screw is fixed inside the hole in the swing base 2031. The slider connecting plate 2032 connects to the guide rail slider 2029 on the guide rail frame 202, providing stability when the swing assembly 203 slides vertically. The swing assembly 203 also includes a bearing seat 2034 mounted on the swing base 2031. The bearing seat 2034 is connected to a first electric push cylinder 2033, which can rotate around the bearing seat 2034. The first electric push cylinder 2033 is connected to a swing rod 2036 via a push-pull rod 2035. One end of the push-pull rod 2035 is connected to the telescopic end of the first 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 first electric push cylinder 2033 extends or retracts, the swing rod 2036 can be moved by the push-pull rod 2035. The free end of the swing rod 2036 is connected to a 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 by a bearing. Therefore, when the first electric push cylinder 2033 works, the swing rod 2036 can swing, which in turn drives the connecting seat 2038 to rotate through the torque sensor 2037. By feeding back data in real time through the torque sensor, precise control of torque is achieved during the tightening process.

[0051] See Figure 5 , Figure 6 and Figure 7 As shown, a mounting base 205 is connected to the connecting base 2038. The mounting base 205 is a square frame. When the first electric push cylinder 2033 works, it drives the mounting base 205 to swing. An extension plate 206 for docking with the connecting base 2038 is provided on the mounting base 205. A center hole is provided on the extension plate 206. The nut conveying mechanism and the offset tightening mechanism are both connected to the mounting base 205. The nut conveying mechanism consists of a nut feeding assembly and a nut loading assembly. Both are docked with the mounting base 205. The nut feeding assembly is used to convey the nut into the blind cavity. Then, the nut is assembled onto the offset tightening mechanism by the nut loading assembly. In this process, there is no need to manually contact the nut directly.

[0052] For details, please refer to Figure 7 and Figure 8As shown, the nut feeding assembly includes a first servo motor 2071, which is mounted on a mounting base 205. A first gear 2072 is fixed on the output shaft of the first servo motor 2071. A positioning sleeve 2073 is mated to the bottom surface of the mounting base 205. A rack and pinion spring 2074 passes through the positioning sleeve 2073, and a notch is provided on the positioning sleeve 2073. A portion of the first gear 2072 is located within this notch, and at this time, the first gear 2072 meshes with the rack and pinion spring 2074. The first servo motor 2071 can control the rack and pinion spring 2074 to move vertically. A gearbox housing 2075 is fixed to the upper end of the rack and pinion spring 2074, and a second servo motor 2076 and a rotary gearbox are mounted on the gearbox housing 2075. The rod 2077 has a gear set inside the gearbox housing 2075. The gear set connects the second servo motor 2076 to the rotating rod 2077. When the second servo motor 2076 is working, it can control the rotating rod 2077 to rotate. The nut is stacked in the rack and pinion cartridge 2074. A stopper 2078 is fixed at the lower end of the rotating rod 2077. The stopper 2078 can restrict the position of the nut. When the rotating rod 2077 rotates, it drives the stopper 2078 to rotate, so that the stopper 2078 no longer restricts the nut. At this time, the constraint on the nut in the rack and pinion cartridge is released, and the nut can slide out of the rack and pinion cartridge 2074. In this way, there is no need to manually install the nut in the blind cavity, reducing the limitation of the diameter of the upper port of the blind cavity, thereby realizing convenient conveying of the nut.

[0053] See Figure 8 and Figure 9 As shown, in a first embodiment of the feed stop 2078, a cylindrical body 20781 is included. The upper end of the cylindrical body 20781 is connected to the rotating rod 2077. A bottom support and a clamping member are provided on the cylindrical body 20781. The clamping member is located above the bottom support. The bottom support is composed of several baffle plates 20782. The several baffle plates 20782 are arranged in a circular array around the cylindrical body 20781. The area between two adjacent baffle plates 20782 is the feeding interval. When the rotating rod 2077 is not rotating, the stop plate 20782 blocks the lower end of the rack and pinion cylinder 2074. After the rotating rod 2077 rotates, the stop plate 20782 moves accordingly. After the stop plate 20782 stops blocking the lower end of the rack and pinion cylinder 2074, the nut inside the rack and pinion cylinder 2074 can slide out, allowing the nut to pass through the feeding interval. The clamping member therein squeezes the nut in the upper position, thus realizing the feeding of the nut one by one.

[0054] The clamping components include several radially extending support rods 20783 mounted on the columnar body 20781. The number of support rods 20783 is the same as the number of feeding intervals. Each support rod 20783 has an arc-shaped bent tie rod 20784 at its end. An elastic pressure rod 20785 is provided between two adjacent support rods 20783. The end of the elastic pressure rod 20785 is connected to the tie rod 20784, and the connection is a rounded transition. The elastic pressure rod 20785 is also arc-shaped, but it forms a wave shape after connecting with the tie rod. The elastic pressure rod 20785 is located directly above the feeding interval. A longitudinal strip-shaped notch is provided on the rack and pinion cylinder 2074 near the lower end. When the rotating rod 2077 rotates, both the stop plate 20782 and the elastic pressure rod 20785 move forward. During the circular motion, when the stop plate 20782 supports the lowest nut located inside the rack and pinion cylinder 2074, the rack and pinion cylinder 2074 is positioned between two adjacent elastic pressure rods 20785. As the rotating rod 2077 rotates, the stop plate 20782 gradually moves away from below the rack and pinion cylinder 2074. During this process, the elastic pressure rod 20785 contacts and compresses the second lowest nut, preventing it from sliding down when the lowest nut falls out of the rack and pinion cylinder 2074. As the rotating rod 2077 continues to rotate, the stop plate 20782 returns to its original position below the rack and pinion cylinder 2074. During this process, the elastic pressure rod 20785 gradually separates from the second lowest nut, allowing the nut inside the rack and pinion cylinder 2074 to be fed downwards.

[0055] See Figure 21 and Figure 22As shown, in a second embodiment of the baffle 2078, a cylindrical body 20781 is included. Two baffle plates 20791 are disposed on the cylindrical body 20781, and baffle plates 20792 are abutted to each of the two baffle plates 20791. In this case, the baffle plates 20791 and 20792 form a baffle plate 20790. That is, two baffle plates 20790 are fixed on the cylindrical body 20781, and the two baffle plates 20790 are arranged vertically. Both are provided with notches 20793. Based on the different horizontal heights of the two baffles 20790, they can be divided into upper and lower baffles. Similarly, the notch on the upper baffle is called the upper notch, and the notch on the lower baffle is called the lower notch. The baffle on the upper baffle is called the upper baffle, and the baffle on the lower baffle is called the lower baffle. The upper baffle is located directly above the lower notch, and the upper notch is located directly above the lower baffle. Two notches are provided on the rack and pinion cartridge 2074. The strip-shaped opening allows the upper and lower baffles to pass through when the columnar body 20781 rotates. When the columnar body 20781 is not rotating, the lower baffle supports the lowest nut in the rack and pinion cylinder 2074, and the upper notch of the upper baffle corresponds to the opening. At this time, the second lowest nut is not restricted. After the columnar body 20781 is rotated, the lower baffle no longer supports the lowest nut, and the lower notch corresponds to the opening. The lowest nut falls under the action of gravity, while the upper baffle supports the second lowest nut, preventing it from being discharged from the rack and pinion cylinder 2074. In this implementation structure, there needs to be a gap between the edges of two adjacent nuts located in the rack and pinion cylinder 2074 so that the upper baffle can enter the gap. When the baffle 2078 adopts this implementation structure, it occupies relatively little space and can be used for nut assembly in a small engine blind cavity environment.

[0056] See Figure 23 and Figure 24As shown, the third embodiment of the stopper 2078 includes a cylindrical body 20781, on which two gears 207101 are provided. A high-position strip-shaped opening and a low-position strip-shaped opening are provided on the rack and pinion cylinder 2074. There are several high-position and low-position strip-shaped openings, all arranged in a circular array around the central axis of the rack and pinion cylinder 2074. A positioning wheel 207102 and a supporting wheel 207103 are axially connected to the rack and pinion cylinder 2074. Both the positioning wheel 207102 and the supporting wheel 207103 have side notches 207104. In this case, the positioning wheel... The positioning disc 207102 and the support disc 207103 are respectively formed with a locking end 2071021 and a support end 2071031. When the side notch 207104 of the locking disc 207102 is aligned with the high-position strip opening, the support end 2071031 on the support disc 207103 is located inside the rack and pinion spring cylinder 2074, and the support end 2071031 supports the lowest position nut. When the support disc 207103 rotates, the locking disc 207102 rotates synchronously, that is, the support disc 207103 rotates until the side notch 207104 is aligned with the low-position strip opening. When aligned, the locking end 2071021 on the locking wheel 207102 enters the rack spring cylinder 2074 after passing through the high-position strip-shaped opening. At this time, the locking end 2071021 supports the second-lowest nut. In this embodiment, there are several locking wheels 207102 and several supporting wheels 207103, and each locking wheel 207102 has a chamfer on its edge. The chamfer facilitates squeezing the edge of the locking wheel 207102 into the space between two adjacent nuts in the rack spring cylinder 2074. However, it should be noted that the locking wheel 207102 and the supporting wheel 207103... During synchronous rotation, the support end 2071031 will only completely separate from the lowest nut after the locking end 2071021 is completely positioned between the lowest nut and the second lowest nut. Thus, when the locking end 2071021 is squeezed between the lowest nut and the second lowest nut, the lowest nut is limited by the support end 2071031, which allows the second lowest nut and the nut above to move upward. This can apply an upward lifting force to the nuts stacked in the rack and pinion cylinder 2074, allowing the stacked nuts to move slightly and preventing the nuts from getting stuck in the rack and pinion cylinder 2074.

[0057] Since the positioning wheel 207102 and the supporting wheel 207103 need to be controlled by the ring gear 207101 to rotate, annular auxiliary gears are fixed on both the positioning wheel 207102 and the supporting wheel 207103. Two gear rings 207105 are connected to the rack and pinion cylinder 2074. The outer and inner circumferential surfaces of the gear rings 207105 are provided with convex teeth. The convex teeth on the inner circumferential surface of the gear rings 207105 mesh with the auxiliary gears, while the convex teeth on the outer circumferential surface of the gear rings 207105 mesh with the ring gears. Thus, when the cylindrical body rotates, it can drive the positioning wheel 207102 and the supporting wheel 207103 to rotate synchronously.

[0058] The slipped nut will fall onto the nut loading assembly. See [link / reference] Figure 7 and Figure 10 As shown, the nut feeding assembly includes a second electric pusher cylinder 2081. An electric pusher cylinder mounting plate 2082 is provided at the bottom of the mounting base 208. The second electric pusher cylinder 2081 is connected to the electric pusher cylinder mounting plate 2082. A flat guide rail is also provided at the bottom of the mounting base 205. A smooth seat 2083 is connected to the flat guide rail. The smooth seat 2083 is connected to the output end of the second electric pusher cylinder 2081. The smooth seat 2083 can be controlled to move horizontally by the second electric pusher cylinder 2081.

[0059] A third electric cylinder 2084 and an inner sleeve are connected to a smooth seat 2083. A rack limiting sleeve is fitted on the outer side of the inner sleeve. A longitudinal rack 2087 passes through the inner sleeve. The inner sleeve has a side opening area, and the rack limiting sleeve 2086 also has an opening. The side opening area on the inner sleeve corresponds to the opening on the rack limiting sleeve 2086. A third servo motor 2085 is connected to the rack limiting sleeve 2086. A second gear 2088 is fixed on the output shaft of the third servo motor 2085. The second gear 2088 meshes with the longitudinal rack 2087. When the third servo motor 2085 works, it can make the longitudinal rack 2087 move vertically. At this time, the longitudinal rack 2087 moves relative to the inner sleeve and the longitudinal rack 2087. A telescopic rod 20811 is connected to the lower end of the longitudinal rack 2087. The telescopic rod 20811 is used to support the nut. At this time, the vertical movement of the longitudinal rack 2087 can drive the telescopic rod 20811 to move vertically, thereby adjusting the horizontal height of the nut.

[0060] A ring-shaped third gear 2089 is connected to the upper end of the rack limiting sleeve 2086, through which the inner sleeve passes. A translation rack 20810 is connected to the output end of the third electric push cylinder 2084. The translation rack 20810 is slidably connected to the smooth seat 2083. This translation rack 20810 meshes with the third gear 2089. When the third electric push cylinder 2084 controls the translation rack 20810 to translate, it can control the rotation of the third gear 2089. At this time, the rack limiting sleeve drives the longitudinal rack 2087 to rotate (the rotation angle cannot reach 360°), thereby adjusting the position of the nut. Therefore, the longitudinal rack and the rack limiting sleeve 2086 need to have an engaging structure, as detailed below:

[0061] A vertically extending strip groove is provided on the longitudinal rack 2087, and a vertically extending notch is provided on the rack limiting sleeve 2086. A roller is provided in the notch, and part of the roller is located in the strip groove on the longitudinal rack 2087. The rack limiting sleeve 2086 is connected to the longitudinal rack 2087 in this way. When the third gear 2089 rotates, it can drive the rack limiting sleeve 2086 to rotate, which in turn drives the longitudinal rack 2087 to rotate. The telescopic rod 20811 at the lower end of the longitudinal rack performs a circular motion.

[0062] See Figure 10 and Figure 11 As shown, the telescopic rod 20811 includes a fixed section 208101 and a telescopic section 208102. A fourth electric push cylinder 20812 is connected to the telescopic rod 20811. The reference end of the fourth electric push cylinder 20812 is connected to the fixed section 208101 of the telescopic rod 20811, and the telescopic end of the fourth electric push cylinder 20812 is connected to the telescopic section 208102 of the telescopic rod 20811. The telescopic rod 20811 can be controlled to extend and retract via the fourth electric push cylinder 20812. An upwardly extending cylindrical protrusion 20813 is abutted at the free end of the telescopic rod 20811. When nut feeding is required, the third electric push cylinder 2084 and the fourth electric push cylinder 2081 are used. 2. Working in concert, the cylindrical protrusion 20813 at the free end of the telescopic rod 20811 moves to a position below the rack and pinion cylinder 2074. At this time, the cylindrical protrusion 20813 and the rack and pinion cylinder 2074 are coaxially aligned. Then, by controlling the stopper 2078, the nut inside the rack and pinion cylinder 2074 can fall onto the cylindrical protrusion 20813. Then, through the coordinated cooperation of the third electric push cylinder 2084 and the third servo motor 2085, the cylindrical protrusion 20813 moves around the longitudinal rack 2087 and assembles the nut onto the offset tightening mechanism. Then, the offset tightening mechanism assembles the nut onto the corresponding bolt and tightens the nut.

[0063] See Figure 12 and Figure 13As shown, the offset tightening mechanism includes a longitudinal slide seat 2091 mounted on a mounting base 205. A vertical guide rail is provided on the inner wall of the mounting base. A guide slider 2093 is connected to the end of the longitudinal slide seat 2091. A tightening gun 2092 and a lifting electric cylinder 2094 are connected to the longitudinal slide seat 2091. The lifting electric cylinder 2094 is connected to the mounting base 205. The lifting electric cylinder 2094 can control the longitudinal slide seat 2091 to move vertically, thereby driving the tightening gun 2092 to move vertically, tightening... The output end of the tightening gun 2092 is connected to 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 set below the torque transmission rod 2095. When the lower end of the torque transmission rod 2095 is connected to 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 tightened onto the bolt.

[0064] The aforementioned locking assembly 2096 is connected to the mounting base 205 via a support sleeve 2097. The upper end of the support sleeve 2097 is fixedly connected to the mounting base 205, and the lower end of the support sleeve 2097 is fixed with an intermediate part 2098. The intermediate part 2098 is hinged to the locking assembly 2096, and a through hole is provided on the intermediate part 2098. At this time, the torque transmission rod 2095 passes through the support sleeve 2097, and the locking assembly 2096 can be rotated.

[0065] Because the diameter of the port on the fan disc shaft is small, in order to facilitate the insertion of the locking assembly 2096 into the blind cavity, the locking assembly 2096 needs to be flipped to a near-vertical state first. Then, the locking assembly 2096 is moved to the lower space of the blind cavity and controlled to be flipped to a horizontal state. Then, the nut slides from the rack spring 2074 onto the cylindrical protrusion 20813 on the nut feeding assembly, and then the nut is assembled onto the locking assembly 2096.

[0066] To control the locking assembly 2096 to rotate, a sliding sleeve 2099 is fitted onto the support sleeve 2097. The upper end of the sliding sleeve 2099 is connected to a push rod via a pull plate 20910. The push rod is fixed to a fifth electric push cylinder, which is mounted on the mounting base 205. The fifth electric push cylinder can control the vertical movement of the sliding sleeve 2099. The sliding sleeve 2099 is connected to the locking assembly 2096 via a connecting rod 20911. Both the connecting rod 20911 and the locking assembly 2096 are hinged. Since the locking assembly 2096 is also hinged to the intermediate part 2098 at the lower end of the support sleeve 2097, the locking assembly 2096 can be controlled to rotate when the sliding sleeve 2099 moves vertically.

[0067] The first embodiment of the locking assembly 2096 described above is described in the reference section. Figure 14 As shown, the locking and tightening assembly 2096 is a torque wrench, specifically including a wrench body 20961, which is elongated. The wrench body 20961 is equipped with a drive gear 20962 and a working gear sleeve 20963. A spring plunger is installed inside the working gear sleeve 20963. The nut is located inside the working gear sleeve 20963, where the spring plunger positions the nut. Both are located at opposite ends of the wrench body 20961 and can rotate. A driven gear 20964 is positioned between the drive gear 20962 and the working gear sleeve 20963. The driven gear 20964 meshes with both, meaning that when the drive gear 20962 rotates, it drives the driven gear 20964 to rotate, which in turn drives the working gear sleeve 20963 to rotate, thus tightening the nut.

[0068] An endoscope and a laser probe are also installed on the lower surface of the wrench body 20961. The endoscope is connected to the display to realize the real-time display of the environment inside the blind cavity of the workpiece during operation, and the laser probe realizes the nut alignment function.

[0069] See Figure 12 and Figure 15 As shown, the aforementioned locking assembly 2096 can also tighten the nut by swinging. At this time, the nut remains within the working gear sleeve 20963, but a positioning cover plate 20965 is installed on the wrench body 20961. The positioning cover plate 20965 has the same shape as the wrench body 20961 and is provided with a strip groove and a circular groove. A ratchet 20966 is installed in the circular groove and is connected to the upper end of the working gear sleeve 20963. A sixth electric push cylinder 209 is installed in the strip groove. 67. The output end of the sixth electric push cylinder 20967 is connected to a locking block 20968. The locking block 20968 is moved by the sixth electric push cylinder 20967, so that the locking block 20968 abuts against the ratchet 20966. At this time, the working gear sleeve 20963 cannot rotate. Then, the locking and tightening assembly 2096 is controlled to swing, so that the nut can be tightened. However, it should be noted that at this time, the working gear sleeve 20963 is coaxially set with the extension plate 206 on the mounting base 205. That is, at this time, the locking and tightening assembly 2096 can be controlled to swing by the swing mechanism.

[0070] It can also be used in combination. For example, the rotation of the torque transmission rod 2095 drives the working gear sleeve 20963 to rotate. At this time, the nut and stud are screwed together. When the nut contacts the workpiece surface, the rotation of the torque transmission rod 2095 is stopped. At this time, the swing component controls the mounting base to swing, which in turn causes the locking component 2096 to swing back and forth around the central axis of the working gear sleeve 20963. During this process, the nut is driven to rotate. 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, so as to facilitate the control of the tightening torque of the nut and achieve the required accuracy of ±3%, the swing amplitude of the locking component 2096 should not be too large. It can be set within the range of 40-80°. In this way, when the locking component 2096 moves clockwise, the nut cannot rotate one revolution. When the locking component 2096 resets counterclockwise, the nut is stationary. In this way, the nut can be tightened in stages, improving the tightening torque accuracy of the nut.

[0071] See Figure 5 , Figures 12 to 17As shown, the working gear sleeve 20963 includes an inner sleeve 209631 and an outer sleeve 209632. The outer sleeve 209632 is fitted onto the inner sleeve 209631. A gear ring 209633 is also provided on the inner sleeve 209631. The outer circumference of the gear ring 209633 is provided with protruding teeth. The gear ring 209633 meshes with the driven gear, so that the driving gear can drive the working gear sleeve to rotate through the driven gear. A top cap is fixed at the upper end of the inner sleeve 209631, and a ratchet 20966 is mated to the top cap. A guide rod 209634 is fixed on the 32, extending upwards and parallel to the central axis of the outer sleeve 209632. The guide rod 209634 passes through the top cap and continues upwards. 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 plate 20965, and a sensor is installed on the hanging plate 20969. When tightening the nut, the torque wrench needs to gradually move downwards as the nut is tightened. At this time, the outer sleeve 209632 and the inner sleeve 209632... All sleeves 209631 move downwards synchronously. After the lower end of the outer sleeve 209632 contacts the workpiece surface, as the inner sleeve 209631 continues to move downwards, the guide rod 209634 and the inner sleeve 209631 undergo relative motion. The distance between the upper end of the guide rod 209634 and the sensor gradually decreases. When the nut contacts the workpiece surface, the upper end of the guide rod 209634 abuts against the sensor. At this time, the sensor sends a feedback signal to the tightening gun and the first electric push cylinder 2033, causing the tightening gun 2092 to control the torque transmission rod 2095 and the drive gear 20962. When the working gear sleeve stops rotating, the oscillating electric push cylinder 2033 begins to extend and retract, which in turn causes the oscillating component 203 to control the support sleeve 2097 to perform a circular motion. When the support sleeve 2097 moves in the forward direction, the locking block 20968 abuts against the ratchet, allowing the nut to be tightened. When the support sleeve 2097 moves in the reverse direction under the control of the oscillating component 203, the locking block 20968 separates from the ratchet, and the working gear sleeve cannot rotate. This allows for the nut to be tightened in stages, facilitating the control of the nut tightening torque and ensuring the required precision.

[0072] A radial through hole 209635 is provided on the aforementioned inner sleeve 209631. A spring plunger passes through the radial through hole 209635. The spring plunger includes a plunger rod 3096 and a return spring 3097. A positioning ring 3098 is sleeved on the plunger rod 3096 and fixed inside the radial through hole 209635. A plug head 3099 is fixed at the inner end of the plunger rod 3096 and can be located inside the through hole. The return spring 3097 is sleeved on... On the plug rod 3096, and with the return spring 3097 located between the plug head 3099 and the positioning ring 3098, the restoring force of the return spring 3097 can drive the plug head to move inward to the inner side of the inner sleeve 209631. When the nut is located inside the inner sleeve 209631 and presses against the plug head 3099, forcing the plug head 3099 to move inward to the radial through hole 209635, the return spring 3097 is compressed, and at this time the nut is positioned by the plug head.

[0073] A waist-shaped opening 3010 is provided on the stopper rod 3096. The waist-shaped opening 3010 is close to the outer end of the stopper rod 3096 and is located outside the inner sleeve 209631. The guide rod 209634 passes through the waist-shaped opening 3010 on the stopper 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 3010. During this process, the stopper rod 3096 gradually moves away from the nut, so that the nut cannot be positioned, which facilitates the separation of the nut from the inner sleeve 209631.

[0074] In addition, in this application, when it is necessary to tighten nuts for different process sequences, the guide rail frame 202 and the swing assembly 203, nut conveying mechanism and offset tightening mechanism installed on the guide rail frame 202 can be moved by rotating the base 201.

[0075] See Figure 4 , Figure 18 and Figure 19As 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. A planar bearing 2012 is disposed on the upper surface of the base plate 2011. The outer ring of the planar bearing 2012 is fixed to the base plate 2011. A large gear ring 2013 is also fixed on the outer ring of the bearing. The large gear ring 2013 is annular and has protruding teeth on its outer circumferential surface. An inner ring mating seat 2014 is fixed on the inner ring of the planar bearing 2012. A guide rail mounting plate 2015 is fixed on the guide rail frame 202. Two strip-shaped translation guide rails 2016 are mounted on this plate. A translation slider 20210 is mounted on the base 2021 of the guide rail frame 202. The translation slider 20210 connects to the translation guide rails 2016 on the guide rail mounting plate 2015, allowing the guide rail frame 202 to 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 connected to the base plate 201. A small gear ring 2018 is connected after passing through the guide rail mounting plate 2015. 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 guide rail mounting plate 2015 can be rotated through the cooperation of the small gear ring 2018 and the large gear ring 2013, thereby causing the guide rail frame 202 located on the guide rail mounting plate 2015 to move in the circumferential direction. A translation electric push cylinder 204 is also provided on the guide rail mounting plate 2015. The output end of 204 is connected to the guide rail frame 202. However, it should be noted that the translation electric push cylinder 204 can extend and retract along the length of the translation guide rail 2016. At this time, the translation electric push cylinder 204 can control the guide rail frame 202 to move linearly, and then control the movement of the guide rail frame 202 by rotating the base 201. In this way, the position of the locking assembly 2096, the cylindrical protrusion 20813 and the rack and pinion spring 2074 can be adjusted, so that the nut to be installed can be precisely matched with the corresponding stud.

[0076] Finally, see Figure 3 , Figure 4 , Figure 18 and Figure 20 As shown, the engine simulation component 3 in this application includes a stator housing simulation component 301, which is in a disc state. An inner cone guide seat 302 is provided at the center of the stator housing simulation component 301. When the rotating base 201 is installed on the stator housing simulation component 301, the outer cone guide seat on the rotating base 201 is connected to the inner cone guide seat 302 on the stator housing simulation component 301. A center opening is provided on the guide rail mounting plate 2015, the chassis 2021, the inner cone guide seat 302, the outer cone guide seat, and the stator housing simulation component 301 to allow the nut delivery mechanism and the offset tightening mechanism to extend into the blind cavity.

[0077] In the implementation of this application, the nut feeding and tightening device 2 is hoisted onto the engine simulation component 3. The outer cone guide seat and the inner cone guide seat 302 cooperate to make the two components concentric. Then, the Z-axis servo motor 2026 rotates, driving the transmission nut 2027 on the lead screw to rise and fall. The transmission nut 2027 is connected to the swing seat 2031, which can make the swing assembly 203 descend as a whole. When the locking and tightening assembly 2096 at the lower end of the offset tightening mechanism enters the blind cavity, the sliding sleeve 2099 is controlled to rise and fall, so that the locking and tightening assembly 2096 flips to a near-vertical state. At this time, the locking and tightening assembly 2096 can smoothly enter the blind cavity. When the locking and tightening assembly 2096 reaches the working position, the sliding sleeve 2099 is raised and lowered to control the locking and tightening assembly 2096 to flip back to a horizontal state.

[0078] Then, the rack and pinion spring 2074 is lowered to the working position, and the telescopic rod 20811 is adjusted to be below the rack and pinion spring 2074. The cylindrical protrusion 20813 fixed to the output end of the telescopic rod 20811 is then coaxially aligned with the rack and pinion spring 2074, allowing the nut inside the rack and pinion spring 2074 to slide onto the cylindrical protrusion 20813. The telescopic rod 20811 is then moved, causing the nut on the cylindrical protrusion 20813 to move to the locking assembly. The working gear sleeve 2096 is positioned directly below the working gear sleeve 20963. Then, the telescopic rod 20811 is moved upward, allowing the nut to enter the working gear sleeve. After the telescopic rod 20811 is removed, the locking assembly 2096 can be controlled to move downward, causing the working gear sleeve 20963 to move directly above the stud. The Z-axis servo motor 2026 rotates, causing the swing assembly 203 to descend as a whole until the nut contacts the stud. Then, the locking assembly 2096 is used to screw the nut and the stud together.

[0079] Finally, see Figure 25 and Figure 26 As shown in this application, when the nut is filled into the rack and pinion cylinder 2074, a guide groove 21001 is provided on the inner wall of the rack and pinion cylinder 2074. The guide groove 21001 extends along the length direction of the rack and pinion cylinder 2074, and there are at least two guide grooves 21001. A guide assembly is installed inside the rack and pinion cylinder 2074. That is, the nut is first filled onto the guide assembly, and then the stacked nut is inserted into the rack and pinion cylinder 2074 through the guide assembly. During this process, the nut will not contact the inner wall of the rack and pinion cylinder 2074, so as to prevent the nut from becoming tilted and stuck during the downward movement.

[0080] The guiding assembly includes a central guide rod 401 and a top plate 402. The top plate 402 is fixed to the upper part of the central guide rod 401. An outer guide rod 403 is also fixed on the top plate 402. The outer guide rods 403 are parallel to the central guide rod 401, and the number of outer guide rods 403 is the same as the number of central guide rods 401. Several nuts can be first fitted onto the central guide rod 401. An end notch is provided at the free end of the outer guide rod 403. A locking rod 404 is hinged at the end notch of the outer guide rod 403. An elastic component is connected between the locking rod 404 and the outer guide rod 403. The elastic component can be a spring or a torsion spring, which is mainly used to provide force to the locking rod 404. When the elastic component is in its normal state, the locking rod 404 is perpendicular to the outer guide rod 403. At this time, the inner end of the locking rod 404 passes through the end notch and contacts the end face of the nut, thereby completing the assembly of the nut on the guiding assembly.

[0081] A locking protrusion 21002 is provided inside the rack and pinion cylinder 2074. The locking protrusion 21002 is located in the guide groove near the lower end. As the guide assembly is inserted from the upper end of the rack and pinion cylinder 2074 and moves downward, the outer end of the locking rod 404 moves in the guide groove 21001. When the outer end of the locking rod 404 contacts the locking protrusion 21002, the locking protrusion 21002 hinders the continued movement of the locking rod 404. However, as the guide assembly continues to be inserted into the rack and pinion cylinder 2074, the locking rod 404 eventually flips, allowing the guide assembly to continue to be inserted a short distance. When the inner end of the locking rod 404 abuts against the bottom end of the guide groove, the top plate 402 is located in the feed port at the top of the rack and pinion cylinder 2074. At this time, the nut inside the rack and pinion cylinder 2074 can slide off under its own weight and will not get stuck inside the rack and pinion cylinder 2074.

[0082] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A nut delivery and tightening device for a blind cavity in an aero-engine, characterized in that, include: The offset tightening mechanism can extend into the engine blind cavity to mate the nut with the stud and tighten the nut; The nut delivery mechanism is used to carry the nut and deliver it into the engine blind cavity, enabling the nut to be positioned on the offset tightening mechanism; Mounting base (205) is used to connect the offset tightening mechanism and the nut delivery mechanism; The swing assembly (203) is connected to the mounting base (205) and enables the mounting base (205) to move in an arc trajectory, thereby causing the offset tightening mechanism to drive the nut to rotate. The bias tightening mechanism includes: The locking assembly (2096) can be vertically flipped and inserted into the blind cavity for positioning the nut; The lower end of the suspension sleeve (2097) is hinged to the locking assembly (2096), and the upper end of the suspension sleeve (2097) is fixed to the swing assembly (203); A sliding sleeve (2099) is fitted onto a support sleeve (2097) and is capable of vertical movement; 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. The nut delivery mechanism includes: A nut feeding assembly, connected to the mounting base (205), is used to feed nuts downwards; The nut feeding assembly is used to receive the nut and can drive the nut to move upward so that the nut can be assembled on the offset tightening mechanism.

2. The nut conveying and tightening device for the blind cavity of an aero-engine according to claim 1, characterized in that, The locking assembly (2096) includes a wrench body (20961) and a working gear sleeve (20963) is provided on the wrench body (20961) so that the nut is located inside the working gear sleeve (20963).

3. The nut conveying and tightening device for the blind cavity of an aero-engine according to claim 2, characterized in that, The locking assembly (2096) further includes: The drive gear (20962) is mounted on the wrench body (20961) and can drive the working gear sleeve (20963) to rotate; The torque transmission rod (2095) is located inside the support sleeve (2097) and is engaged with the drive gear (20962), which can drive the drive gear (20962) to rotate.

4. The nut conveying and tightening device for the blind cavity of an aero-engine according to claim 1, characterized in that, The nut feeding assembly includes: The smooth seat (2083) is connected to the mounting base (205) and is capable of translation; A rack and pinion retaining sleeve (2086) is mated to a smooth seat (2083) and extends vertically; The longitudinal rack (2087) passes through the rack limiting sleeve (2086) and is capable of vertical movement; The telescopic rod (20811) is horizontally set and connected to the lower end of the longitudinal rack (2087); A cylindrical protrusion (20813) is provided on the telescopic rod (20811) to receive the nut.

5. The nut feeding and tightening device for the blind cavity of an aero-engine according to claim 4, characterized in that, The nut feeding assembly also includes: The third gear (2089) is located at the upper end of the rack limiting sleeve (2086) and is used to drive the longitudinal rack (2087) to rotate, so that the cylindrical protrusion (20813) moves around the longitudinal rack (2087).

6. The nut feeding and tightening device for the blind cavity of an aero-engine 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), the offset tightening mechanism and the nut conveying mechanism to move horizontally; The rotating base (201) is connected to the guide rail frame (202) and enables the guide rail frame (202) to rotate.

7. An engine assembly system using the nut delivery and tightening equipment for the blind cavity of an aero-engine as described in any one of claims 1 to 6, characterized in that, include: The engine simulation component is located below the nut delivery and tightening equipment in the blind cavity of the aero-engine, and is used to position the assembly components and support the nut delivery and tightening equipment in the blind cavity of the aero-engine.

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