CN215846790U

CN215846790U - Self-pressing type tightening device

Info

Publication number: CN215846790U
Application number: CN202121040127.8U
Authority: CN
Inventors: 张潇; 张延�; 徐尧
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2021-05-14
Filing date: 2021-05-14
Publication date: 2022-02-18
Anticipated expiration: 2031-05-14

Abstract

The utility model discloses a self-pressing type screwing device which is used for screwing a nut on the surface of a static part and comprises a base, a screwing part and a pressing part, wherein the base is arranged on the surface of the static part, a through hole is formed in the base, the bottom of the screwing part penetrates through the through hole and is abutted to the end surface of the nut, the pressing part is positioned at the opening at the top of the through hole, the pressing part comprises a pressing end cover and a stress application elastic part, the stress application elastic part is pressed between the pressing end cover and the screwing part, and the compression direction of the stress application elastic part is the direction far away from the nut. According to the self-pressing type screwing device, the pressing end cover is arranged at the opening at the top of the through hole, and the stress application elastic piece is pressed between the pressing end cover and the screwing part, so that a pushing force acts on the screwing part, and a pressing pushing force is applied to the wrench in the process that the wrench rotates and descends in a spiral mode along with the nut, so that the reliable contact between the bottom end of the wrench and the nut is ensured, the manual adjustment of an operator is not needed, and the operation efficiency is improved.

Description

Self-pressing type tightening device

Technical Field

The utility model relates to the field of assembly of aircraft engines, in particular to a self-pressing type tightening device.

Background

During the assembly or disassembly of an aircraft engine, a large nut on its surface is usually screwed by a wrench with face teeth against a face groove of the nut. However, since the axial contact between the wrench and the nut is released by the movement of the nut in the axial direction of the screw during the screwing operation, it is necessary to adjust the axial height of the wrench so as to ensure the abutment with the nut, thereby enabling the screwing operation to be continued.

Usually, constructor will adopt and design one section screw thread at the other end of spanner, after the nut along a distance of axial displacement, impel the spanner to the direction that the nut removed through the screw thread of the spanner other end to guarantee that both lean on fully. However, in this way, not only a certain experience is required for the operator to ensure that the shifting distance is properly changed, but also the axial shifting of the wrench may not be smooth due to the difference between the pitches of the two threads of the wrench and the nut, and the wrench may not play a role in compressing.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of high operation difficulty and poor compression effect of manually adjusting the axial height of a wrench in the prior art, and provides a self-pressing type tightening device.

The utility model solves the technical problems through the following technical scheme:

the self-pressing type tightening device is used for tightening a nut on the surface of a static part and is characterized by comprising a base, a tightening part and a pressing part, wherein the base is arranged on the surface of the static part, a through hole is formed in the base, the bottom of the tightening part penetrates through the through hole and is abutted to the end face of the nut, the pressing part is located at the top opening of the through hole and comprises a pressing end cover and a stress application elastic part, the stress application elastic part is arranged between the pressing end cover and the tightening part in a pressing mode, and the compression direction of the stress application elastic part is the direction far away from the nut.

This self-pressure formula tightening device is through setting up one at through-hole top opening part and compressing tightly the end cover, thereby realize compressing tightly and can pressing between the inside portion of screwing up of end cover and through-hole and establish an afterburning elastic component, and make this afterburning elastic component to screwing up a driving force of portion effect, at the spanner along with the nut carries out spiral in-process that rotates the decline, afterburning elastic component continuously gives the thrust of pushing down at the top of screwing up the portion, the contact reliability between spanner bottom and the nut has been guaranteed, whole in-process does not need the manual adjustment of operating personnel, but the in-process that moves down at the spanner carries out height control automatically, not only guaranteed to compress tightly the reliability, and the operating efficiency is also improved.

Preferably, the base is a positioning frame, the positioning frame includes a positioning main body and at least two supporting legs, all the supporting legs are circumferentially arranged along an outer side surface of the positioning main body, one ends of the supporting legs, which are far away from the positioning main body, are connected to the stationary part, the through holes are formed in the surface of the positioning main body, and the tightening part is positioned on the through holes. The base sets up the mode for the location main part and the supporting legs that are used for the location, is not only convenient for counterpoint and fix the portion of screwing up, still through the setting of supporting legs, conveniently fixes on the surface of the different grade type of static piece, has guaranteed the stability of this screwing up device in the use.

Preferably, an opening is formed in one end, far away from the positioning main body, of the supporting leg, a connecting hole corresponding to the opening is formed in the surface of the stationary member, and the positioning frame and the stationary member are fixedly connected in the opening and the connecting hole in a penetrating mode through a bolt. The supporting legs and the static parts are mutually fixed through bolt connection, reliability of the tightening device in the using process can be guaranteed under large torque, and damage to a structural body caused by looseness under large force action is avoided.

Preferably, the pressing end cover is annular, a positioning shaft hole corresponding to the through hole is formed in the middle of the pressing end cover, and the pressing end cover is arranged on the upper surface of the base and connected with the base through a bolt. The top opening that compresses tightly the end cover around the through-hole sets up to the annular, and the centre forms the location shaft hole corresponding with the through-hole, provides the space that supplies to screw up the portion and pass, has still guaranteed to screw up the portion and has fixed in radial rigidity to annular butt face can make afterburning elastic component have annular butt to screwing up the portion, makes the thrust that screws up the portion and receives even, guarantees that its direction that moves down is stable.

Preferably, the force applying elastic member is a spring, two ends of the spring respectively abut against the bottom surface of the pressing end cover and the top surface of the tightening part, and the spring is continuously in a compressed state. The spring structure has good deformation effect, is easy to obtain, and has obvious annular abutting effect.

Preferably, an annular groove is formed in the bottom surface of the pressing end cover, and the top end of the spring abuts against the inside of the annular groove. The arrangement of the annular groove facilitates the fixation of the spring, and the spring is guaranteed not to deflect due to the fact that the spring is made of soft materials and is stressed greatly.

Preferably, the tightening part includes a wrench and a stop shaft, the stop shaft is sleeved outside the wrench, a plurality of protrusions are disposed on a surface of the stop shaft, a limiting groove corresponding to the protrusions is disposed on an inner surface of the through hole, and the stop shaft and the base are mutually limited by the protrusions in the limiting groove. The stop shaft provides the space for the use of spanner, and the relative base of stop shaft is fixed simultaneously, and the relative stationary part of base is fixed, has consequently guaranteed the stability of spanner in screwing up the in-process to the nut.

Preferably, the outer surface of the wrench is circumferentially provided with at least one circle of abutting ring, and the outer side surface of the abutting ring abuts against the inner surface of the stop shaft. The arrangement of the abutting ring is used for limiting the wrench in the radial direction relative to the stop shaft, and the wrench can be fixed relative to the stop shaft to a certain extent in order to provide a friction braking effect between the wrench and the stop shaft.

Preferably, an anti-rotation part is arranged on the outer periphery of the top of the nut, the anti-rotation part is fixed relative to the stationary part, a hooking device is fixedly connected to the bottom end of the stop shaft, and the hooking device is clamped at the outer edge of the anti-rotation part. The other end of the stop shaft is provided with a fastener, so that the position of the stop shaft in the axial direction and the radial direction is further ensured to be fixed.

Preferably, the self-pressing type tightening device further comprises a torque multiplier, the torque multiplier is connected with the wrench through a shaft, a fixing frame is further arranged on the upper surface of the base, and the torque multiplier is erected at the top end of the wrench through the fixing frame and keeps coaxial with the wrench. The torque multiplier is used for changing the spanner torque, and the arrangement of the fixing frame is convenient for arranging and fixing the torque multiplier and avoids radial displacement.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the utility model.

The positive progress effects of the utility model are as follows:

according to the self-pressing type screwing device, the pressing end cover is arranged at the opening at the top of the through hole, so that the stressing elastic piece can be pressed between the pressing end cover and the screwing part in the through hole and acts on the screwing part with a pushing force, and in the process that the wrench rotates and descends in a spiral mode along with the nut, the stressing elastic piece continuously gives a pushing force for pressing down on the top of the screwing part, so that the reliable contact between the bottom end of the wrench and the nut is ensured, the manual adjustment of an operator is not needed in the whole process, but the height adjustment is automatically performed in the process that the wrench moves downwards, the pressing reliability is ensured, and the operation efficiency is improved.

Drawings

Fig. 1 is a schematic structural view of a self-pressing type tightening device according to a preferred embodiment of the present invention in use.

Fig. 2 is a schematic sectional view taken along a-a direction of fig. 1.

Fig. 3 is a partial structural diagram of a portion B in fig. 2.

Fig. 4 is a partial structural view of the self-pressing type tightening device according to the preferred embodiment of the present invention.

Fig. 5 is a schematic structural view of a base of the self-pressing type tightening device according to the preferred embodiment of the present invention.

Fig. 6 is a schematic structural view of a wrench of a self-pressing type tightening device according to a preferred embodiment of the present invention.

Fig. 7 is a schematic structural view of a stopper shaft of the self-pressing type tightening device according to the preferred embodiment of the present invention.

Fig. 8 is a schematic structural view of a fixing frame of the self-pressing type tightening device according to the preferred embodiment of the utility model.

Description of reference numerals:

stationary part 1

Nut 10

Self-pressing type tightening device 2

Base 21

Through-hole 211

Positioning body 212

Supporting leg 213

Opening 213a

Limiting groove 214

Tightening part 22

Spanner 221

Abutment ring 221a

Urging part 221b

Face teeth 221c

Stop shaft 222

Convex portion 222a

Fastener 222b

Pressing part 23

Compression end cap 231

Positioning shaft hole 231a

Annular groove 231b

Stress application elastic member 232

Anti-rotation member 24

Torque multiplier 25

Fixing frame 26

Fixed headpiece 261

Support beam 262

Limit slot 27

Detailed Description

The present invention will be more clearly and completely described below by way of a preferred embodiment in conjunction with the accompanying drawings, without thereby limiting the scope of the utility model to the described embodiment.

As shown in fig. 1 to 8, the present embodiment provides a self-pressing type tightening device 2 for performing a tightening operation on a nut 10 on a surface of a stationary member 1, the self-pressing type tightening device 2 including a base 21, a tightening part 22, and a pressing part 23, the base 21 being disposed on the surface of the stationary member 1, the base 21 having a through hole 211, a bottom of the tightening part 22 passing through the through hole 211 and abutting against an end surface of the nut 10, the pressing part 23 being located at a top opening of the through hole 211, the pressing part 23 including a pressing end cap 231 and an urging elastic member 232, the urging elastic member 232 being pressed between the pressing end cap 231 and the tightening part 22, and a compression direction of the urging elastic member 232 being a direction away from the nut 10.

This self-pressing formula tightening device 2 is through setting up one at through-hole 211 top opening part and compressing tightly end cover 231, thereby realize compressing tightly and can pressing between the inside portion of screwing up 22 of end cover 231 and through-hole 211 and establish an afterburning elastic member 232, and make this afterburning elastic member 232 to the portion of screwing up 22 effect driving force, back in the terminal surface groove of nut 10 is blocked to terminal surface tooth 221c at spanner 221, along with nut 10 carries out the spiral in-process that rotates the decline, afterburning elastic member 232 continues to give the thrust of pushing down at the top of portion of screwing up 22, it is reliable to have guaranteed the contact between spanner 221 bottom and the nut 10, whole in-process does not need the manual adjustment of operating personnel, but the in-process automation that moves down at spanner 221 carries out height adjustment, not only guarantee to compress tightly the reliability, operating efficiency has still been improved.

Specifically, as shown in fig. 5, the base 21 of the self-pressing type tightening device 2 is a positioning frame, the positioning frame includes a positioning main body 212 and at least two supporting legs 213, all the supporting legs 213 are circumferentially arranged along an outer side surface of the positioning main body 212, one end of each supporting leg 213, which is far away from the positioning main body 212, is connected to the stationary member 1, the through hole 211 is disposed on the surface of the positioning main body 212, and the tightening part 22 is positioned on the through hole 211. The base 21 is provided with the positioning main body 212 and the supporting legs 213 for positioning, so that the screwing part 22 can be conveniently aligned and fixed, the surfaces of different types of the static part 1 can be conveniently fixed through the supporting legs 213, and the stability of the screwing device in the using process is ensured. Preferably, in the present embodiment, the supporting legs 213 are provided as two supporting rods on the same straight line to achieve the above-mentioned effect, and the positioning body 212 is provided to be fixed to the supporting legs 213 by forming the through-hole 211 in a cylindrical shape and fitting the joint surface at the side thereof. Of course, in other embodiments, other shapes or arrangements of the positioning body 212 and the supporting legs 213 may be provided, as long as the above-mentioned functions are achieved.

On the basis, one end of the supporting leg 213, which is far away from the positioning main body 212, is provided with an opening 213a, the surface of the stationary member 1 is provided with a connecting hole corresponding to the opening 213a, and the positioning frame and the stationary member 1 are fixedly connected through the opening 213a and the connecting hole by bolts. The supporting leg 213 and the stationary member 1 are fixed to each other by a bolt connection, so that the reliability of the tightening device in the use process can be ensured under a large torque, and damage to the structure caused by looseness under a large force action can be avoided.

Further, as shown in fig. 4, the pressing end cap 231 is ring-shaped, the middle of the pressing end cap 231 has a positioning shaft hole 231a corresponding to the through hole 211, and the pressing end cap 231 covers the upper surface of the base 21 and is bolted to the base 21. The compressing end cover 231 is arranged in a ring shape around the top opening of the through hole 211, the middle of the compressing end cover forms a positioning shaft hole 231a corresponding to the through hole 211, a space for the tightening part 22 to pass through is provided, the tightening part 22 is ensured to be fixed at the radial position, and the annular abutting surface can enable the stress application elastic piece 232 to abut against the tightening part 22 in the circumferential direction, so that the pushing force applied to the tightening part 22 is uniform, and the downward moving direction of the tightening part is stable. Preferably, the middle portion of the pressing end cap 231 may be disposed to axially protrude from the plane of the top opening of the through hole 211, and this arrangement provides an inner space for accommodating the urging elastic member 232, and at the same time, is located at a third height position with respect to the top opening of the through hole 211 and the opening hole 213a, thereby providing a better radial fixing effect for the tightening part 22; the edge of the pressing end cap 231 and the positioning body 212 of the base 21 can be connected by bolts, so as to further ensure the fixing effect.

In this embodiment, the urging elastic member 232 is a spring, both ends of the spring are respectively abutted against the bottom surface of the pressing end cap 231 and the top surface of the tightening part 22, and the spring is continuously compressed. The spring structure has good deformation effect, is easy to obtain, and has obvious annular abutting effect. Of course, in other embodiments, other forms of force applying resilient members 232 may be used, such as rubber pads and the like.

An annular groove 231b is formed in the bottom surface of the pressing end cap 231, and the top end of the spring abuts against the annular groove 231 b. The arrangement of the annular groove 231b facilitates fixing the spring, and ensures that the spring is not deflected due to the fact that the material is soft and the stress is large.

The tightening part 22 of the self-pressing type tightening device 2 comprises a wrench 221 and a stop shaft 222, the stop shaft 222 is sleeved outside the wrench 221, a plurality of protrusions 222a are arranged on the surface of the stop shaft 222, a limiting groove 214 corresponding to the protrusions 222a is formed in the inner surface of the through hole 211, and the stop shaft 222 and the base 21 are located in the limiting groove 214 through the protrusions 222a and are limited mutually. The stop shaft 222 provides a space for the wrench 221 to use, and at the same time, the stop shaft 222 is fixed relative to the base 21, and the base 21 is fixed relative to the stationary member 1, thereby ensuring the stability of the wrench 221 during the process of tightening the nut 10. In this embodiment, the protruding portion 222a uses four keys uniformly distributed on the outer side surface of the stop shaft 222 to realize circumferential limit with the base 21. In order to achieve a better limiting effect, other embodiments may also adopt other manners of arranging the convex portion 222 a.

Further, as shown in fig. 4, at least one ring of abutting ring 221a is circumferentially disposed on the outer surface of the wrench 221, and the outer side surface of the abutting ring 221a abuts against the inner surface of the stopper shaft 222. The abutment ring 221a is provided not only to limit the position of the wrench 221 with respect to the stopper shaft 222 in the radial direction, but also to fix the wrench 221 with respect to the stopper shaft 222 to some extent in order to provide a friction braking effect between the wrench 221 and the stopper shaft 222. In this embodiment, two rings of the abutting ring 221a are provided to ensure the abutting effect.

The nut 10 is provided with an anti-rotation piece 24 on the top periphery side, the anti-rotation piece 24 is fixed relative to the stationary piece 1, the bottom end of the stop shaft 222 is fixedly connected with a fastener 222b, and the fastener 222b is clamped on the outer edge of the anti-rotation piece 24. The other end of the stop shaft 222 is provided with a fastener 222b, which further ensures the position fixation in the axial and radial directions. In the present embodiment, the hooks 222b are arranged so as to be circumferentially evenly distributed along the lower edge of the stopper shaft 222.

In addition, the self-pressing type tightening device 2 further comprises a torque multiplier 25, the torque multiplier 25 is connected to the wrench 221 through a shaft, a fixing frame 26 is further arranged on the upper surface of the base 21, and the torque multiplier 25 is erected at the top end of the wrench 221 through the fixing frame 26 and keeps coaxial with the wrench 221. The torque multiplier 25 is used to vary the torque of the wrench 221, and the mounting bracket 26 is provided to facilitate the positioning and fixing of the torque multiplier 25 and to avoid radial displacement. The fixing frame 26 and the positioning main body 212 can be fixedly connected through bolts. Further, as shown in fig. 8, the fixing frame 26 includes a fixing head 261 and a supporting beam 262, the fixing head 261 is fitted on the surface of the torque multiplier 25, the supporting beam 262 is fixed on the surface of the positioning body 212, and the top end is connected to the side of the fixing head 261.

The positioning body 212 of the self-pressing type tightening device 2 is further provided with a limit slot 27, the top end of the wrench 221 is further movably connected with a force application part 221b, the limit slot 27 is used for limiting the rotation position of the force application part 221b, and if a limit insert is inserted into the limit slot 27, and the axial height of the limit insert is higher than that of the force application part 221b, the rotation limitation of the limit insert can be realized. Of course, in other embodiments, other types of limiting structures may be provided, or no limiting structure may be provided.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the utility model, and these changes and modifications are within the scope of the utility model.

Claims

1. The self-pressing type tightening device is used for tightening a nut on the surface of a static part and is characterized by comprising a base, a tightening part and a pressing part, wherein the base is arranged on the surface of the static part, a through hole is formed in the base, the bottom of the tightening part penetrates through the through hole and is abutted to the end face of the nut, the pressing part is located at the top opening of the through hole and comprises a pressing end cover and a stress application elastic part, the stress application elastic part is arranged between the pressing end cover and the tightening part in a pressing mode, and the compression direction of the stress application elastic part is the direction far away from the nut.

2. The self-pressing type tightening device according to claim 1, wherein the base is a positioning frame, the positioning frame includes a positioning main body and at least two supporting legs, all the supporting legs are circumferentially arranged along an outer side surface of the positioning main body, one ends of the supporting legs, which are far away from the positioning main body, are connected to the stationary member, the through holes are formed in a surface of the positioning main body, and the tightening part is positioned on the through holes.

3. The self-pressing type tightening device according to claim 2, wherein an opening is formed in one end, away from the positioning main body, of the supporting leg, a connecting hole corresponding to the opening is formed in the surface of the stationary member, and the positioning frame and the stationary member are fixedly connected through bolts penetrating through the opening and the connecting hole.

4. The self-pressing type tightening device according to claim 1, wherein the pressing end cap is annular, a positioning shaft hole corresponding to the through hole is formed in the middle of the pressing end cap, and the pressing end cap is arranged on the upper surface of the base and connected with the base through a bolt.

5. The self-pressing type tightening device according to claim 4, wherein the urging elastic member is a spring, both ends of the spring abut against the bottom surface of the pressing end cap and the top surface of the tightening portion, respectively, and the spring is continuously compressed.

6. The self-pressing type tightening device according to claim 5, wherein an annular groove is provided on a bottom surface of the pressing end cap, and a top end of the spring abuts against the inside of the annular groove.

7. The self-pressing type tightening device according to claim 1, wherein the tightening part includes a wrench and a stopper shaft, the stopper shaft is sleeved outside the wrench, a plurality of protrusions are provided on a surface of the stopper shaft, a stopper groove corresponding to the protrusions is provided on an inner surface of the through hole, and the stopper shaft and the base are mutually restricted by the protrusions in the stopper groove.

8. The self-pressing type tightening device according to claim 7, wherein the wrench is provided with at least one ring of abutting rings on an outer surface thereof in a circumferential direction, and an outer side surface of the abutting ring abuts against an inner surface of the stopper shaft.

9. The self-pressing type tightening device according to claim 7, wherein an anti-rotation member is provided on the top outer peripheral side of the nut, the anti-rotation member is fixed with respect to the stationary member, and a hooking device is fixedly coupled to the bottom end of the locking shaft, and the hooking device is caught at an outer edge of the anti-rotation member.

10. The self-pressing tightening device according to claim 7, further comprising a torque multiplier, wherein the torque multiplier is connected to the wrench through a shaft, and a fixing bracket is further provided on an upper surface of the base, and the torque multiplier is mounted on a top end of the wrench through the fixing bracket and is kept coaxial with the wrench.