Aircraft engine blind cavity internal nut screwing device and method

Abstract

The application provides an aero-engine blind cavity internal nut screwing device and method, and relates to the field of aero-engine assembly equipment.The device comprises a locking and screwing assembly, the locking and screwing assembly can be vertically flipped and extended into the blind cavity of the engine, a working gear sleeve is arranged on the locking and screwing assembly, the working gear sleeve can rotate, and is used for clamping and screwing the nut; compared with the prior art, the locking and screwing assembly can be smoothly extended into the blind cavity of the engine through vertical flipping, and then the locking and screwing assembly 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 and screwing assembly; after the nut and the stud are aligned, the nut and the stud can be screwed through the rotation of the working gear sleeve; in this process, the hand does not need to be extended into the blind cavity of the engine, and the screwing efficiency is higher compared with manual screwing.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine assembly technology, specifically relating to a nut tightening device and method for a small space environment inside the blind cavity 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, and the tightening torque of the nut is required to be 92N.m~98N.m, i.e., the accuracy is ±3%.

[0004] Currently, for such confined spaces, the usual practice is to manually tighten the nuts and then use specialized equipment to lock them in place. However, the tightening accuracy is generally ≥±6%, and it is impossible to achieve ≤±3%. If the nuts are tightened manually, it is subject to the limitations of the assembly environment, which places strict requirements on the size of the operator's hands, and the efficiency is low. Summary of the Invention

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

[0006] To achieve the above objectives, the technical solution adopted by the present invention is a nut tightening device for the blind cavity of an aero-engine, comprising an offset tightening mechanism and a swing assembly. The swing assembly is connected to the offset tightening mechanism. The offset tightening mechanism includes a mounting base and a support sleeve. The support sleeve is connected to the mounting base, and a torque transmission rod passes through the support sleeve. A locking assembly is hinged to the lower end of the support sleeve. The locking assembly includes a drive gear and a working gear sleeve, which are coupled together, allowing the working gear sleeve to rotate and tighten the nut. A sliding sleeve is connected to the locking assembly and is connected to the support sleeve. The sliding sleeve can move vertically, allowing the locking assembly to rotate vertically. When the locking assembly is in a horizontal state, the drive gear engages with the torque transmission rod.

[0007] The swing assembly comprises a swing base and a connecting base, the connecting base is connected with the swing base through a shaft, the connecting base is connected with the biasing tightening mechanism, when the connecting base rotates, the lock tightening assembly moves around the central axis of the working gear sleeve, and is used for repeatedly rotating the nut.

[0008] Further, the biasing tightening mechanism comprises an extension plate, the extension plate is arranged on the mounting base and is used for being connected with the connecting base, so that the working gear sleeve is coaxially arranged with the extension plate and the connecting base.

[0009] Further, the swing assembly comprises a bearing base, a swing electric push cylinder, a swing rod and a push-pull rod, the bearing base is arranged on the swing base, the swing electric push cylinder is connected with the bearing base and can move around the bearing base, the swing rod is connected with the connecting base, and the push-pull rod is connected with the swing electric push cylinder and the swing rod at two ends.

[0010] Further, the swing assembly further comprises a torque sensor, which is arranged on the connecting base and is connected with the swing rod, and is used for feeding back the tightening torque data.

[0011] Further, the biasing tightening mechanism further comprises a connecting rod, the connecting rod is hinged with the sliding sleeve and the lock tightening assembly, so that when the sliding sleeve moves vertically, the lock tightening assembly can be turned over.

[0012] Further, the lock tightening assembly comprises a wrench main body, the driving gear and the working gear sleeve are arranged on the wrench main body, and the nut is arranged in the working gear sleeve.

[0013] Further, the lock tightening assembly (2096) further comprises a driven gear, which is arranged on the wrench main body and is engaged with the driving gear and the working gear sleeve respectively, and is used for synchronously rotating the working gear sleeve and the driving gear.

[0014] Further, the biasing tightening mechanism further comprises a tightening gun, an output end of the tightening gun is connected with the torque transmission rod, and the torque transmission rod can be controlled to ascend and rotate.

[0015] Further, the device further comprises a guide rail frame and a rotating base, the guide rail frame is connected with the swing assembly and is used for driving the swing assembly and the biasing tightening mechanism to move horizontally, and the rotating base is connected with the guide rail frame and can rotate the guide rail frame.

[0016] An aviation engine blind cavity internal nut tightening method, the aviation engine blind cavity internal nut tightening device is applied, and the method comprises the following steps:

[0017] The lock tightening assembly is turned over and adjusted, and after the lock tightening assembly enters the blind cavity opening, the lock tightening assembly is reversely turned over to a horizontal state;

[0018] The nut is clamped by the working gear sleeve, and the lock tightening assembly in the horizontal state is moved, so that the nut is located at the upper end of the stud;

[0019] Control the rotation of the working gear sleeve, and control the downward movement of the locking and tightening assembly to screw the nut with the stud;

[0020] When the nut is in contact with the surface of the workpiece, the working gear sleeve stops rotating and the swing assembly works;

[0021] Make the locking and tightening assembly move clockwise around the central axis of the working gear sleeve first, so that the nut rotates N times, N<1, and then control the locking and tightening assembly to move counterclockwise, during which the nut is in a static state, and when the locking and tightening assembly moves counterclockwise to the initial position, a locking and tightening action is completed, and then the above locking and tightening action is repeated to make the nut tend to be tightened.

[0022] Compared with the prior art, the beneficial effects of the present application are: through the vertical flipping of the locking and tightening assembly, the locking and tightening assembly can smoothly enter the blind cavity of the engine, and then the locking and tightening assembly 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 of the locking and tightening assembly, after aligning the nut with the stud, the nut can be screwed with the stud through the rotation of the working gear sleeve, during which the hand does not need to be inserted into the blind cavity of the engine, and compared with manual tightening, the present application has higher tightening efficiency;

[0023] When the nut is tightened to contact the surface of the workpiece, the locking and tightening assembly is controlled to swing by the swing assembly, at this time the action of manually tightening the nut is simulated, and the torque accuracy when the nut is tightened is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a sectional view of the connecting part of the fan disc shaft and the connecting disc in the prior art;

[0025] Figure 2 is a schematic diagram of the overall structure of the present application;

[0026] Figure 3 is a schematic diagram of the guide rail frame structure of the present application;

[0027] Figure 4 is a schematic diagram of the front side view of the swing assembly of the present application;

[0028] Figure 5 is a schematic diagram of the rear side view of the swing assembly of the present application;

[0029] Figure 6 is a schematic diagram of the biasing and tightening mechanism of the present application;

[0030] Figure 7 is a schematic diagram of the connection between the locking and tightening assembly and the suspension sleeve of the present application;

[0031] Figure 8Structure schematic diagram of wrench body example of the present application;

[0032] Figure 9 Structure schematic diagram of wrench body example of the present application;

[0033] Figure 10 Structure schematic diagram of wrench body example of the present application;

[0034] Figure 11 Structure schematic diagram of wrench body example of the present application;

[0035] Figure 12 Structure schematic diagram of wrench body example of the present application;

[0036] Figure 13 Structure schematic diagram of wrench body example of the present application.

[0037] Among them, 1003 is a fan disc shaft, 1004 is a connecting disc, 201 is a rotating base, 2011 is a bottom plate, 2012 is a plane bearing, 2013 is a large gear ring, 2014 is an inner ring butt joint seat, 2015 is a guide rail mounting plate, 2016 is a translation guide rail, 2017 is a rotating servo motor, 2018 is a small gear ring, 2021 is a bottom disc, 2022 is a hanging disc, 2023 is a side support, 2024 is a center opening, 2025 is a lead screw, 2026 is a Z-axis servo motor, 2027 is a transmission nut, 2028 is a vertical guide rail, 2029 is a guide rail sliding block, 202 is a guide rail frame, 203 is a swing assembly, 2031 is a swing seat, 2032 is a sliding block connecting plate, 2033 is an electric push cylinder, 2034 is a bearing seat, 2035 is a push-pull rod, 2036 is a swing rod, 2037 is a torque sensor, 2038 is a connecting seat, 204 is a translation electric push cylinder, 205 is a mounting seat, 206 is an extension plate, 2091 is a longitudinal sliding seat, 2092 is a tightening gun, 2093 is a guide sliding block, 2094 is a lifting electric push cylinder, 2095 is a torque transmission rod, 2096 is a locking and tightening assembly, 2097 is a hanging support sleeve, 2098 is an intermediate piece, 2099 is a sliding sleeve, 20910 is a pull plate, 20911 is a connecting rod, 20961 is a wrench body, 20962 is a driving gear, 20963 is a working gear sleeve, 20964 is a driven gear, 20965 is a positioning cover plate, 20966 is a ratchet wheel, 20967 is a positioning electric push cylinder, 20968 is a clamping block, 209631 is an inner sleeve, 209632 is an outer sleeve, 209633 is a gear ring, 209634 is a guide rod, 20969 is a hanging plate, 209635 is a radial perforation, 3096 is a plug rod, 3097 is a return spring, 3098 is a positioning ring, 3099 is a plug head, 3010 is a waist-shaped port, and 3011 is a guide plate. DETAILED DESCRIPTION

[0038] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0039] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0040] Referring to Figure 2 As shown in the drawings, the nut screwing device in the blind cavity of an aero-engine comprises a rotating base 201 and a guide rail frame 202, the guide rail frame 202 is movably connected with the rotating base 201, so that the guide rail frame 202 can move horizontally on the rotating base 201, an oscillating assembly 203 is arranged on the guide rail frame 202, the oscillating assembly 203 is connected with a biasing screwing mechanism, when the guide rail frame 202 moves, the oscillating assembly 203 and the biasing screwing mechanism can be driven to move, so that the nut can be accurately butted with the bolt.

[0041] Referring to Figure 3 and Figure 12As shown, the guide rail frame 202 includes a chassis 2021 and a hanging plate 2022, the hanging plate 2022 is connected with the chassis 2021 through side supports 2023, the side supports 2023 have a control area between the hanging plate 2022 and the chassis 2021, a central opening 2024 is arranged at the center of the chassis 2021, the biasing and tightening mechanisms all pass through the central opening 2024, a swing assembly 203 is located in the control area, the biasing and tightening mechanisms are connected with the swing assembly 203, the biasing and tightening mechanisms can be controlled to move in an arc trajectory through the swing assembly 203, a lead screw 2025 is also arranged in the control area, the upper end of the lead screw 2025 is connected with a Z-axis servo motor 2026, the Z-axis servo motor 2026 rotates to drive the lead screw 2025 to rotate, a transmission nut 2027 is screwed on the lead screw 2025, the swing assembly 203 is connected with the transmission nut 2027, and a vertical guide rail 2028 is arranged on the side support 2023, a guide rail slider 2029 is connected with the vertical guide rail 2028, the guide rail slider 2029 is connected with the swing assembly 203, when the lead screw 2025 rotates, the biasing and tightening mechanisms can move vertically, thereby adjusting the horizontal height of the biasing and tightening mechanisms, so that the nut can be adjusted in the horizontal height in the blind cavity, no matter the length of the stud is long or short, the nut can be connected with the stud;

[0042] A connecting block is arranged on the chassis 2021, the connecting block is connected with a translation electric push cylinder 204, the translation electric push cylinder 204 is connected with the rotating base 201, when the output end of the translation electric push cylinder 204 extends or retracts, the chassis 2021 can be driven to translate, thereby adjusting the position of the biasing and tightening mechanisms;

[0043] Referring to Figure 3 、 Figure 4 and Figure 5The swing assembly 203 shown in the figure includes a swing base 2031, which is also provided with a central port. A hole and a sliding block connecting plate 2032 are arranged on the swing base 2031. A transmission nut 2027 on the lead screw 2025 is fixed in the hole on the swing base 2031. The sliding block connecting plate 2032 is in butt joint with a guide rail sliding block 2029 on the guide rail frame 202, so that the swing assembly 203 has stability when vertically sliding. The swing assembly 203 further includes a bearing seat 2034 arranged on the swing base 2031. The bearing seat 2034 is connected with 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 with a swing rod 2036 through a push-pull rod 2035. One end of the push-pull rod 2035 is in butt joint with a telescopic end of the swing electric push cylinder 2033. The other end of the push-pull rod 2035 is hinged with the swing rod 2036. When the output end of the swing electric push cylinder 2033 is telescopic, the swing rod 2036 can be moved through the push-pull rod 2035. A free end of the swing rod 2036 is connected with a torque sensor 2037. The torque sensor 2037 is fixed with a connecting seat 2038, which is connected with the swing base 2031 through a bearing and a shaft. Therefore, when the swing electric push cylinder 2033 works, the swing rod 2036 can swing. At this time, the torque sensor 2037 rotates, and further drives the connecting seat 2038 to rotate. The torque sensor 2037 can feedback data in real time, so as to realize accurate control of torque in the tightening process.

[0044] Referring to Figure 6 and Figure 7As shown, the biasing and tightening mechanism comprises a mounting seat 205 connected with the connecting seat 2038, which is a square frame. When the swing electric cylinder 2033 works, the mounting seat 205 swings and moves in a circular orbit. An extension plate 206 for connecting with the connecting seat 2038 is arranged on the mounting seat 205, and a center hole is arranged on the extension plate 206. A vertical slide 2091 is arranged on the mounting seat 205, and a vertical guide rail is arranged on the inner side wall of the mounting seat 205. A guide slide block 2093 is arranged at the end of the vertical slide 2091. A tightening gun 2092 and a lifting electric cylinder 2094 are arranged on the vertical slide 2091. The lifting electric cylinder 2094 is connected with the mounting seat 205. The vertical slide 2091 can move vertically by the lifting electric cylinder 2094, and the tightening gun 2092 moves vertically. A torque transmission rod 2095 is connected with the output end of the tightening gun 2092. The lifting and rotation of the torque transmission rod 2095 can be controlled by the tightening gun 2092. A locking assembly 2096 for tightening is arranged below the torque transmission rod 2095. When the lower end of the torque transmission rod 2095 is connected with the locking assembly 2096, the locking assembly 2096 can be controlled to work by 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 on the bolt.

[0045] The locking assembly 2096 is connected with the mounting seat 205 through a hanging support sleeve 2097. The upper end of the hanging support sleeve 2097 is fixedly connected with the mounting seat 205. The lower end of the hanging support sleeve 2097 is fixedly connected with an intermediate piece 2098. The intermediate piece 2098 is hingedly connected with 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 hanging support sleeve 2097. The locking assembly 2096 can be vertically flipped.

[0046] Because the caliber of the upper port of the fan disc shaft 1003 is small, in order to extend the locking assembly 2096 into the blind cavity, the locking assembly 2096 needs to be flipped to a vertical state first. Then, the locking assembly 2096 is moved to the lower space of the blind cavity, and the locking assembly 2096 is flipped to a horizontal state. At this time, the nut is assembled on the locking assembly 2096. The nut can be rotated after the locking assembly 2096 works.

[0047] To control the rotation of the locking assembly 2096, 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 an auxiliary electric push cylinder, which is mounted on the mounting base 205. The auxiliary 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, which is hinged to both. Since the locking assembly 2096 is also hinged to the intermediate piece 2098 at the lower end of the support sleeve 2097, when the sliding sleeve 2099 moves vertically, the locking assembly 2096 can be rotated. Upon entry, the locking assembly 2096 can be adjusted to a near-vertical state. After entering the engine blind cavity, the locking assembly 2096 can be adjusted to a horizontal state, allowing the nut on the locking assembly 2096 to engage with the bolt.

[0048] See Figure 8 and Figure 9 As shown, the aforementioned locking assembly 2096 includes a torque wrench and a positioning cover plate 20965. The positioning cover plate 20965 is located above the torque wrench. The torque wrench specifically includes a wrench body 20961, which is elongated. A drive gear 20962 and a working gear sleeve 20963 are provided on the wrench body 20961. The drive gear 20962 can connect with the torque transmission rod. A spring plunger is provided inside the working gear sleeve 20963. The nut is located inside the working gear sleeve 20963. At this time, the spring... The plunger positions the nut. The drive gear 20962 and the working gear sleeve 20963 are respectively located at both ends of the wrench body 20961 and can rotate. A driven gear 20964 is provided between the drive gear 20962 and the working gear sleeve 20963. The driven gear 20964 meshes with both of them. That is, when the drive gear 20962 rotates, it can drive the driven gear 20964 to rotate, and then drive the working gear sleeve 20963 to rotate through the driven gear 20964, thereby turning the nut.

[0049] The positioning cover plate 20965 is the same shape as the wrench body 20961, the positioning cover plate 20965 is provided with a strip-shaped groove and a circular groove, the circular groove is provided with a ratchet wheel 20966, the ratchet wheel 20966 is connected with the upper end of the working gear sleeve 20963, the strip-shaped groove is provided with a positioning electric push cylinder 20967, the output end of the positioning electric push cylinder 20967 is connected with a clamping block 20968, the clamping block 20968 is moved by controlling the positioning electric push cylinder 20967, so that the clamping block 20968 abuts against the ratchet wheel 20966, at this time the working gear sleeve 20963 cannot rotate, then the locking and twisting assembly 2096 is swung to twist the nut, but it should be noted that at this time the working gear sleeve 20963 is coaxial with the extension plate 206 on the mounting seat 205, that is, at this time the swinging mechanism can control the locking and twisting assembly 2096 to move in an arc trajectory, the center of the arc trajectory is located on the center axis of the working gear sleeve 20963, at this time the locking and twisting assembly 2096 forms a swinging motion posture simulating manual tightening of the nut, when the nut is twisted in the forward direction, the locking and twisting assembly 2096 moves reversely, the positioning electric push cylinder 20967 is retracted, the clamping block 20968 is separated from the ratchet wheel 20966, at this time the working gear sleeve 20963 can rotate.

[0050] In application, the working gear sleeve 20963 is rotated by rotating the torque transmission rod 2095, at this time the nut is twisted with the stud, when the nut contacts the workpiece surface, the rotation of the torque transmission rod 2095 is stopped, at this time the mounting seat 205 is swung by the swinging assembly 203, and then the locking and twisting assembly 2096 reciprocally swings around the center axis of the working gear sleeve 20963, the nut is rotated in this process, the swinging amplitude of the locking and twisting assembly 2096 determines the rotation angle of the nut, which simulates the operation of manually twisting the nut, so as to control the tightening torque of the nut, the precision reaches ±%, the swinging amplitude of the locking and twisting assembly 2096 should not be too large, which can be set to be within the range of -°, so that when the locking and twisting assembly 2096 moves clockwise, the nut cannot rotate one circle, and when the locking and twisting assembly 2096 moves counterclockwise, the nut is in a static state, so that the nut can be twisted in layers to improve the tightening torque precision of the nut.

[0051] Reference Figures 4 to 7 , Figures 9 to 11As shown, the working gear sleeve 20963 comprises an inner sleeve 209631 and an outer sleeve 209632, the outer sleeve 209632 is sleeved on the inner sleeve 209631, and a gear ring 209633 is further arranged on the inner sleeve 209631, the outer circumferential surface of the gear ring 209633 is provided with a convex tooth, 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, the top end cap is fixed on the upper end of the inner sleeve 209631, the ratchet wheel 20966 is butted on the top end cap, the guide rod 209634 is fixed on the outer sleeve 209632 and extends upward, the guide rod 209634 is parallel to the central axis of the outer sleeve 209632, the guide rod 209634 extends upward after penetrating the top end cap, when the outer sleeve 209632 moves vertically, the guide rod 209634 moves vertically, the hanging plate 20969 extending horizontally is arranged on the positioning cover plate 20965, the inductor is arranged on the hanging plate 20969, when the nut is screwed, the torque wrench needs to be moved downward gradually with the screwing of the nut, at this time, the outer sleeve 209632 and the inner sleeve 209631 move downward synchronously, the lower end of the outer sleeve 209632 contacts the workpiece surface, and then the inner sleeve 209631 continues to move downward, at this time, the guide rod 209634 moves relative to the inner sleeve 209631, the distance between the upper end of the guide rod 209634 and the inductor gradually decreases, when the nut contacts the workpiece surface, the upper end of the guide rod 209634 abuts against the inductor, at this time, the inductor 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 20963 stops rotating, and the swing electric push cylinder 2033 starts to perform the extension and retraction action, so that the swing assembly 203 controls the hanging support sleeve 2097 to perform the circular motion, when the hanging support sleeve 2097 moves forward, the clamping block 20968 abuts against the ratchet wheel 20966, at this time, the nut can be screwed, when the hanging support sleeve 2097 moves reversely controlled by the swing assembly 203, the clamping block 20968 is separated from the ratchet wheel 20966, at this time, the working gear sleeve 20963 cannot rotate, so that the nut can be tightened periodically, which is convenient for controlling the nut tightening torque and achieving the required precision.

[0052] The inner sleeve 209631 is provided with a radial perforation 209635, a spring plunger passes through the radial perforation 209635, the spring plunger comprises a plug rod 3096 and a reset spring 3097, the plug rod 3096 is sleeved with a positioning ring 3098, the positioning ring 3098 is fixed in the radial perforation 209635, a plug head 3099 is fixed at the inner end of the plug rod 3096, the plug head 3099 can be located in the perforation, the reset spring 3097 is sleeved on the plug rod 3096, and the reset spring 3097 is located between the plug head 3099 and the positioning ring 3098, the restoring force of the reset spring 3097 can drive the plug head 3099 to move to the inner side of the inner sleeve 209631, when the nut is located in the inner sleeve 209631 and is in extrusion contact with the plug head 3099, the plug head 3099 is forced to move into the radial perforation 209635, and the reset spring 3097 is compressed, at this time, the nut is positioned by the plug head 3099;

[0053] The plug rod 3096 is provided with a waist-shaped port 3010, the waist-shaped port 3010 is close to the outer end of the plug rod 3096 and is located outside the inner sleeve 209631, a guide rod 209634 passes through the waist-shaped port 3010 on the plug rod 3096, the guide rod 209634 is provided with a guide plate 3011, 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 port, in this process, the plug rod 3096 is gradually moved away from the nut, so that the nut cannot be positioned, and the nut can be separated from the inner sleeve 209631.

[0054] Referring to Figure 2 , Figure 3 , Figure 12 and Figure 13As shown, the rotating base 201 includes a circular bottom plate 2011, the lower surface of the bottom plate 2011 is fixed with an outer conical guide seat, the upper surface of the bottom plate 2011 is provided with a plane bearing 2012, wherein the bearing outer ring of the plane bearing 2012 is fixed with the bottom plate 2011, and a large gear ring 2013 is further fixed on the bearing outer ring, the large gear ring 2013 is annular and provided with a convex tooth on the outer circumferential surface, an inner ring butt joint seat 2014 is fixed on the bearing inner ring of the plane bearing 2012, the inner ring butt joint seat 2014 is fixed with a guide rail mounting plate 2015, the guide rail mounting plate 2015 is provided with two strip-shaped translation rails 2016, a translation slide is arranged on the bottom plate 2021 of the guide rail frame 202, the translation slide is connected with the translation rails 2016 on the guide rail mounting plate 2015, so that the guide rail frame 202 can be translated, 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 with a small gear ring 2018 through the bottom plate 2011, 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 works, the guide rail mounting plate 2015 can be rotated through the cooperation of the small gear ring 2018 and the large gear ring 2013, and then the guide rail frame 202 located on the guide rail mounting plate 2015 moves in the circumferential direction, a translation electric push cylinder 204 is further arranged on the guide rail mounting plate 2015, the output end of the translation electric push cylinder 204 is connected with 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 rails 2016, at this time the translation electric push cylinder 204 can control the guide rail frame 202 to move linearly, and then the guide rail frame 202 is controlled to move through the rotating base 201, so that the position of the lock screw assembly 2096 can be adjusted, and finally the nut to be installed can be accurately matched with the corresponding stud.

[0055] The device embodiments described above are only schematic, wherein the units shown as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, can be located in one place, or can be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment scheme. Those skilled in the art can understand and implement without creative labor.

[0056] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An aircraft engine blind cavity internal nut-upset device characterized by, The biasing tightening mechanism comprises a mounting base (205) and a hanger sleeve (2097) connected to the mounting base (205), a torque transmission rod (2095) passing through the hanger sleeve (2097), and a lock-tight assembly (2096) hinged to the lower end of the hanger sleeve (2097); The lock-tight assembly (2096) comprises a driving gear (20962) and a working gear sleeve (20963) coupled to each other, so that the working gear sleeve (20963) can rotate and screw the nut through the working gear sleeve (20963); The lock-tight assembly (2096) further comprises a wrench body (20961), a ratchet wheel (20966), and a positioning electric push cylinder (20967), and the driving gear (20962) and the working gear sleeve (20963) are both connected to the wrench body; The ratchet wheel (20966) is connected to the upper end of the working gear sleeve (20963); The working gear sleeve (20963) comprises an inner sleeve (209631) and an outer sleeve (209632), the outer sleeve (209632) is sleeved on the inner sleeve (209631), the inner sleeve (209631) is provided with a gear ring (209633) and a top cap, and the top cap is in butt joint with the ratchet wheel (20966); The outer sleeve (209632) is fixed with a guide rod (209634) extending upward; The lock-tight assembly is provided with a horizontally extending hanging plate, and the hanging plate is provided with an inductor, when the nut is screwed, the outer sleeve (209632) moves relative to the inner sleeve (209631), so that the distance between the upper end of the guide rod (209634) and the inductor becomes smaller, when the nut contacts the surface of the workpiece, the upper end of the guide rod (209634) abuts against the inductor, so that the working gear sleeve (20963) stops rotating; The output end of the positioning electric push cylinder (20967) is in butt joint with a clamping block (20968), and the clamping block (20968) is moved by the positioning electric push cylinder (20967), so that the clamping block (20968) abuts against the ratchet wheel (20966); The lock-tight assembly (2096) is connected with a sliding sleeve (2099), the sliding sleeve (2099) is connected to the hanger sleeve (2097) and can move vertically, the vertical movement of the sliding sleeve (2099) enables the lock-tight assembly (2096) to vertically flip, when the lock-tight assembly (2096) is in a horizontal state, the driving gear (20962) is clamped with the torque transmission rod (2095); The swing assembly (203) is connected with the biasing tightening mechanism; The swing assembly (203) comprises a swing base (2031) and a connecting base (2038) hinged to the swing base (2031), and the connecting base (2038) is connected with the biasing tightening mechanism, when the connecting base (2038) rotates, the lock-tight assembly (2096) moves around the central axis of the working gear sleeve (20963) for repeatedly screwing the nut. The biasing tightening mechanism comprises:

2. The aircraft engine blind cavity internal nut-upset device of claim 1, wherein, ​ An extension plate (206) is arranged on the mounting base (205) and is used to be connected with the connecting base (2038) to arrange the working gear sleeve (20963) coaxially with the extension plate (206) and the connecting base (2038).

3. The aircraft engine blind cavity internal nut-upset device of claim 2, wherein, The swing assembly (203) comprises: A bearing seat (2034) arranged on the swing base (2031); A swing electric push cylinder (2033) connected with the bearing seat (2034) and capable of moving around the bearing seat (2034); A swing rod (2036) connected with the connecting base (2038); A push-pull rod (2035) connected with the swing electric push cylinder (2033) and the swing rod (2036) at two ends respectively.

4. The aircraft engine blind cavity internal nut-upset device of claim 3, wherein, The swing assembly (203) further comprises: A torque sensor (2037) mounted on the connecting base (2038) and connected with the swing rod (2036) to feed back the tightening torque data.

5. The aircraft engine blind cavity internal nut-upset device of claim 4, wherein, The biasing and tightening mechanism further comprises: A connecting rod (20911) hinged with the sliding sleeve (2099) and the locking and tightening assembly (2096) to make the sliding sleeve (2099) move vertically to drive the locking and tightening assembly (2096) to flip.

6. The aircraft engine blind cavity internal nut-upset device of claim 1, wherein, The locking and tightening assembly (2096) further comprises: A driven gear (20964) arranged on the wrench main body (20961) and engaged with the driving gear (20962) and the working gear sleeve (20963) respectively to make the working gear sleeve (20963) rotate synchronously with the driving gear (20962).

7. The aircraft engine blind cavity internal nut-upset device of claim 6, wherein, The biasing and tightening mechanism further comprises: A tightening gun (2092) connected with the torque transmission rod (2095) to control the lifting and rotation of the torque transmission rod (2095).

8. The aircraft engine blind bore nut-up device of claim 1, wherein, Further comprising: A guide rail frame (202) connected with the swing assembly (203) to drive the swing assembly (203) and the biasing and tightening mechanism to move horizontally; A rotating base (201) connected with the guide rail frame (202) to make the guide rail frame (202) rotate.

9. A method for screwing a blind cavity internal nut of an aeroengine, using a device for screwing a blind cavity internal nut of an aeroengine according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: The locking and tightening assembly (2096) is flipped to adjust, and after the locking and tightening assembly (2096) enters from the blind cavity opening, it is flipped reversely to a horizontal state; The nut is clamped by the working gear sleeve (20963), and the nut is located at the upper end of the stud by moving the locking and tightening assembly (2096) in the horizontal state; The working gear sleeve (20963) is controlled to rotate, and the locking and tightening assembly (2096) is controlled to move downward to make the nut screwed with the stud; When the nut contacts the workpiece surface, the working gear sleeve (20963) stops rotating, and the swing assembly (203) works; The locking and tightening assembly (2096) is first moved clockwise around the central axis of the working gear sleeve (20963) to make the nut rotate N times, N<1, and then the locking and tightening assembly (2096) is controlled to move counterclockwise, and the nut is in a static state during the counterclockwise movement, and when the locking and tightening assembly (2096) moves counterclockwise to the initial position, one locking and tightening action is completed, and then the above locking and tightening action is repeated to make the nut tend to be tightened.

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