Compact symmetrically-assembled bushing withdrawing device

Abstract

A plurality of pull claw grooves which are axially arranged along an annular shell are formed in the annular shell, a shaft is mounted in the annular shell, a first ratchet wheel groove is formed in the outer circle of the front end of the shaft, the middle of the shaft is in threaded connection with the annular shell, pull claws are mounted in the pull claw grooves, and a first ratchet wheel is mounted in the first ratchet wheel groove. A pulling claw spring used for driving the pulling claw to move in the radial direction of the annular shell is installed between the pulling claw and the annular shell, an annular cam is installed at the front end of the annular shell, a plurality of protrusions matched with the pulling claw are arranged at the front end of the annular cam, and a second ratchet wheel groove is formed in the end face of the rear end of the annular cam. A pawl and a pawl spring which are matched with the second ratchet wheel groove are installed between the annular shell and the second ratchet wheel groove, the front end of the shaft extends into the annular cam, and a spring piece matched with the first ratchet wheel groove is installed on the annular cam. The withdrawing operation of the compact symmetrically-assembled thin-wall lining can be realized without depending on hammering, and the method has the core advantages of small interference space, simplicity and convenience in operation, no damage to a base body and blind operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mechanical processing and assembly maintenance, in particular to a compact symmetrical assembly bushing withdrawal device. BACKGROUND

[0002] As a commonly used matching component in the field of machinery, the bushing is widely used in protection and wear protection scenes. After the assembly of the bushing is completed, the surface of the assembly base and the assembly hole are usually subjected to precision surface treatment. Especially in the field of aerospace, the bushing is mostly used in the lug hole part of the rotating mechanism, and the symmetrical installation mode is mostly adopted at both ends of the lug hole. The gap between the inner end faces of the two bushings is extremely small. In the subsequent maintenance and repair process, the thin-walled bushing needs to be withdrawn and disassembled for replacement, but the traditional slide hammer and drawing type withdrawal device has the technical defects of large interference space requirement, easy slipping of the hook, and easy damage to the part base, which is difficult to meet the disassembly requirements of high precision and high reliability.

[0003] Therefore, it is urgent to design a special withdrawal tool with wide adjustment range, small interference space and low impact force to solve the safe withdrawal problem of the thin-walled bushing under the above special working conditions. SUMMARY

[0004] The technical problem to be solved by the present application is that the existing bushing withdrawal device does not meet the needs of bushing withdrawal in a narrow and complex space environment. The present application provides a compact symmetrical assembly bushing withdrawal device with low impact force and safe and lossless withdrawal.

[0005] To solve the above technical problems, the present application adopts the following technical solutions: A compact symmetrical assembly bushing withdrawal device comprises: A ring-shaped shell, a plurality of pawl grooves for installing pawls are arranged on the outer circle of the ring-shaped shell, the pawl grooves are arranged along the axial direction of the ring-shaped shell, and a matching hole is arranged in the middle part of the ring-shaped shell; A shaft is installed in the matching hole of the ring-shaped shell, a first ratchet groove is arranged on the outer circle of the front end of the shaft, and the middle part of the shaft is threadedly connected with the matching hole of the ring-shaped shell; A pawl is installed in the pawl groove on the ring-shaped shell, and a pawl spring for driving the pawl to move radially along the ring-shaped shell is installed between the pawl and the ring-shaped shell; A ring-shaped cam is installed at the front end of the matching hole of the ring-shaped shell, a plurality of protrusions matched with the pawl are arranged at the front end of the ring-shaped cam, a second ratchet groove is arranged on the end face of the rear end of the ring-shaped cam, a pawl and a pawl spring matched with the second ratchet groove are installed between the ring-shaped shell and the second ratchet groove, the front end of the shaft extends into the inner circle of the ring-shaped cam, and a spring sheet matched with the first ratchet groove is installed on the inner circle of the ring-shaped cam.

[0006] The application is used in a narrow space, two withdrawal devices are symmetrically installed in two bushings, the two shafts are pressed (extruded) from opposite directions by rotating the shafts of the two withdrawal devices, the pawl is driven by the annular shell, the bushing is uniformly withdrawn from both sides of the part, the whole withdrawal process does not need to rely on hammering, the impact force on the part is small, the space requirement for the use environment is more relaxed, especially suitable for the withdrawal operation of the compact symmetrically assembled thin-walled bushing under the assembly state of aerospace components or after assembly, and has the core advantages of small interference space, simple operation, no damage to the base body and blind operation.

[0007] In addition, during the withdrawal operation of the application, the adjustment of the working diameter of the withdrawal device and the stable pulling withdrawal of the bushing can be realized by the cooperation of the double ratchet structure and the annular cam structure.

[0008] Meanwhile, the device can be compatible with the slide hammer to adapt to the bushing withdrawal operation under normal working conditions, has strong universality and wide application value.

[0009] Preferably, the two ends of the pawl slot are respectively provided with radial limiting grooves, and the two ends of the pawl are respectively provided with pawl limiting pins, which are installed in the radial limiting grooves to limit the opening size (freedom) of the pawl.

[0010] Preferably, a limiting baffle is installed at the rear end of the annular shell, and a radial limiting groove matched with the pawl limiting pin at the rear end of the pawl is arranged in the limiting baffle.

[0011] Preferably, a pawl guide groove is arranged on the outer circle of the annular shell, and a pawl positioning pin is correspondingly arranged on the pawl to ensure the relative fixation of the position of the pawl.

[0012] Preferably, an internal hexagonal wrench groove is arranged at the rear end of the shaft to facilitate the rotation of the shaft by using an internal hexagonal wrench.

[0013] Preferably, a plurality of cam limiting pins for blocking the front end of the annular cam are installed on the annular shell to ensure the stable installation of the annular cam.

[0014] Compared with the prior art, the application has the following beneficial effects: 1) The application is used in the case that the working space is narrow, the inner hole diameter of the bushing is ≤D25mm, the wall thickness of the bushing is ≤1.5mm, the symmetrically installed bushing has an intermediate gap of ≤2mm, it is inconvenient to observe, and the part is not damaged, the safe withdrawal of the bushing is realized, the operation of the application is simple, the working size can be adjusted, the adjustment range is 10% of the inner hole size of the bushing, and the use of impact force to withdraw the bushing can be avoided to cause the thin-walled bushing bottom end face to be pulled.

[0015] 2) The present application is particularly suitable for safe removal of compact symmetric interference fit thin-wall bushings: the present application realizes the adjustment of the working diameter of the withdrawal device and the stable pulling withdrawal of the bushing through the double ratchet and cam structure, effectively solving the safe disassembly problem of compact symmetric assembly type bushings and blind hole assembly bushings.

[0016] 3) The device of the present application does not need to rely on hammering, and has more relaxed space requirements for the use environment, and is particularly suitable for compact assembly thin-wall bushing withdrawal operation under the assembly state of aerospace components or after assembly, and has the core advantages of small interference space, simple operation, no damage to the base body, and blind operation. At the same time, the device of the present application can be compatible with the slide hammer to adapt to the bushing withdrawal operation under ordinary working conditions, and has strong versatility and wide application value. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0018] Figure 1 is a structural exploded view of an embodiment of the device of the present application.

[0019] Figure 2 is a state diagram of the minimum stroke of the draw claw of the device of the present application.

[0020] Figure 3 is an A-A sectional view of Figure 2 .

[0021] Figure 4 is an enlarged view of C of Figure 3 .

[0022] Figure 5 is a state diagram of the draw claw tensioning bushing of the device of the present application.

[0023] Figure 6 is a B-B sectional view of Figure 5 .

[0024] Figure 7 is an enlarged view of D of Figure 6 .

[0025] Figure 8 is a working state diagram of the device of the present application for compact symmetric interference fit thin-wall bushing withdrawal, wherein the left side is the draw claw locking state and the right side is the minimum stroke of the draw claw.

[0026] Figure 9 is a working state diagram of the device of the present application for blind hole assembly bushing withdrawal.

[0027] Explanation of symbols in the drawings: 1 ring-shaped housing; 2 shaft; 3 puller claw; 4 ring-shaped cam; 5 spring piece; 6 pawl; 7 pawl spring; 8 cam limit pin; 9 puller claw spring; 10 limit baffle; 11 screw; 12 puller claw limit pin; 13 puller claw positioning pin; 14 puller claw groove; 15 radial limit groove; 16 fitting hole; 17 first ratchet groove; 18 inner hexagonal wrench groove; 19 protrusion; 20 second ratchet groove; 21 puller claw guide groove; 22 bushing; 23 part; 24 gasket. DETAILED DESCRIPTION

[0028] The application will be further described below in connection with specific preferred embodiments, but the scope of protection of the application is not limited thereby.

[0029] In the description of the application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0031] Please refer to Figure 1 - Figure 7 The compact symmetrical assembly bushing extraction device according to the application comprises a ring-shaped housing 1, a shaft 2, a puller claw 3, a ring-shaped cam 4, a spring piece 5, a pawl 6, a pawl spring 7, a cam limit pin 8, a puller claw spring 9, a limit baffle 10, a screw 11, a puller claw limit pin 12, and a puller claw positioning pin 13.

[0032] Three claw grooves 14 for mounting claws 3 are arranged on the outer circle of the ring-shaped casing 1, the claw grooves 14 are arranged along the axial direction of the ring-shaped casing 1, and the two ends of the claw grooves 14 are respectively provided with radial limiting grooves 15, and the middle part of the ring-shaped casing 1 is provided with a matching hole 16. In the embodiment, the radial limiting groove 15 at the front end of the claw groove 14 is arranged on the ring-shaped casing 1; in order to facilitate the installation of the claw 3, a limiting baffle 10 is arranged at the rear end of the ring-shaped casing 1, and the limiting baffle 10 is provided with a radial limiting groove 15 matched with the claw limiting pin 12 at the rear end of the claw 3. Obviously, the present application is not limited to this, and the radial limiting groove 15 at the rear end can also be arranged on the ring-shaped casing 1 as at the front end.

[0033] The shaft 2 is mounted in the matching hole 16 of the ring-shaped casing 1. The outer circle of the front end of the shaft 2 is provided with a first ratchet groove 17, the middle part is threadedly connected with the matching hole 16 of the ring-shaped casing 1, and the tail part is provided with an internal hexagonal wrench groove 18.

[0034] The claw 3 is mounted in the claw groove 14 on the ring-shaped casing 1, and the claw 3 and the ring-shaped casing 1 are mounted with a claw spring 9 for driving the claw 3 to move along the radial direction of the ring-shaped casing 1, and the two ends of the claw 3 are respectively provided with claw limiting pins 12, which are mounted in the radial limiting grooves 15.

[0035] The ring-shaped cam 4 is mounted at the front end of the matching hole 16 of the ring-shaped casing 1, and a plurality of cam limiting pins 8 for stopping the front end of the ring-shaped cam 4 are mounted on the ring-shaped casing 1. The front end of the ring-shaped cam 4 is provided with a plurality of protrusions 19 matched with the claw 3, the rear end face is provided with a second ratchet groove 20, the ring-shaped casing 1 and the second ratchet groove 20 are mounted with a pawl 6 matched with the second ratchet groove 20 and a pawl spring 7 for driving the pawl 6, and the front end of the shaft 2 extends into the inner circle of the ring-shaped cam 4, and the inner circle of the ring-shaped cam 4 is mounted with a spring sheet 5 matched with the first ratchet groove 17. In this way, the spring sheet 5 and the shaft 2 form a set of ratchet devices, and the ring-shaped cam 4, the pawl 6 and the pawl spring 7 form another set of ratchet devices.

[0036] In order to ensure the smooth movement of the claw 3, a claw guide groove 21 is arranged on the outer circle of the ring-shaped casing 1, and a claw positioning pin 13 is correspondingly arranged on the claw 3.

[0037] When the present application is used, in a free state, the three claws 3 will expand to the maximum outer diameter under the elastic force of the claw spring 9, and will be limited by the claw limiting pin 12 and the radial limiting groove 15, and the pawl spring 7 remains in a free state, and the pawl 6 and the second ratchet groove 20 remain in a sliding connection state. The claw 3 is guided by the claw positioning pin 13 and the claw guide groove 21 during movement. In a free state, the shaft 2 can not be mounted into the ring-shaped casing 1.

[0038] The present application is used for the withdrawal of a compact and symmetrical assembly type bushing 22, two devices of the present application are adopted (as shown inFigure 8 The specific exit is as follows: 1) press the three pullers 3 simultaneously inward to the minimum outer diameter position (as shown in Figure 2 ), during which the puller spring 9 is compressed and inserts the puller 3 into the inner hole of the bushing 22 together with the annular shell until the head of the puller 3 is placed in the gap between the two bushings 22 (as shown in Figure 6 ); 2) release the puller 3, which will be supported in the inner hole of the bushing 22 under the elastic force of the puller spring 9; 3) install the shaft 2 into the annular shell 1 (it is to be noted that the present application is not limited to the installation of the shaft 2 into the annular shell 1, and the shaft 2 can be kept installed in the annular shell 1 all the time), so that the shaft 2 cooperates with the annular shell 1 and the annular cam 4, and the spring sheet 5 is clamped into the first ratchet groove 17 of the shaft 2, at this time, the state is as shown in Figure 5 ; 4) rotate the shaft 2 counterclockwise, since the spring sheet 5 is clamped in the first ratchet groove 17 of the shaft 2 (as shown in Figure 7 ), the shaft 2 drives the annular cam 4 to rotate, and the protrusion 19 on the annular cam 4 pushes against the three pullers 3 (as shown in Figure 6 ), so that the puller 3 will not be loosened when subjected to the axial pulling force, in addition, when the annular cam 4 rotates counterclockwise, the pawl spring 7 is not compressed, and the second ratchet groove 20 keeps slipping with the pawl 6 (as shown in Figure 5 ).

[0039] 5) rotate the shaft 2 clockwise, since the first ratchet groove 17 on the shaft 2 slips with the spring sheet 5, the annular cam 4 will not rotate clockwise with the shaft 2, at the same time, under the action of the pawl spring 7, the second ratchet groove 20 on the annular cam 4 will be clamped by the pawl 6, further ensuring that the annular cam 4 will not rotate clockwise, so that the puller 3 will not be loosened. The threaded connection between the shaft 2 and the annular shell 1 enables the shaft 2 and the annular shell 1 to move axially relative to each other.

[0040] During the entire exit process, the exit devices on both sides of the part 23 rotate the shaft 2 at the same time, the shafts 2 of the two exit devices press against each other, the annular shell 1 drives the puller 3, the puller 3 drives the bushing 22 to move in the opposite direction, and then the bushing 22 is smoothly exited from the inner hole of the part 23.

[0041] When the present application is used for the exit of the blind hole assembly bushing 22, as shown in Figure 9 , the general steps are consistent with the compact and symmetrical assembly type bushing, and the bushing 22 is exited by rotating the shaft 2, but only one device of the present application is used at this time, and a gasket 24 needs to be placed at the bottom of the blind hole, and the gasket 24 is pressed during the rotation of the shaft 2 to drive the annular shell 1 to drive the puller 3, and the puller 3 drives the bushing 22 to move in the opposite direction.

[0042] The above merely describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can make many possible changes and modifications to the technical solutions of the present application, or modify equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of the present application, by using the technical contents disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the content of the technical solutions of the present application, shall fall within the protection scope of the technical solutions of the present application.

Claims

1. A compact symmetrical assembly bushing withdrawal device, characterized in that... include: An annular housing has multiple claw grooves on its outer circumference for mounting claws. The claw grooves are arranged along the axial direction of the annular housing, and a mating hole is provided in the middle of the annular housing. The shaft is installed in the mating hole of the annular housing. The outer circle of the front end of the shaft is provided with a first ratchet groove, and the middle part is threadedly connected to the mating hole of the annular housing. A pull claw is installed in a pull claw groove on the annular housing, and a pull claw spring is installed between the pull claw and the annular housing to drive the pull claw to move radially along the annular housing; An annular cam is installed at the front end of the mating hole of the annular housing. The front end of the annular cam is provided with multiple protrusions that mate with the pull pawl, and the rear end face is provided with a second ratchet groove. A pawl and a pawl spring that match the second ratchet groove are installed between the annular housing and the second ratchet groove. The front end of the shaft extends into the inner circle of the annular cam, and a spring plate that mates with the first ratchet groove is installed on the inner circle of the annular cam.

2. The compact symmetrical assembly bushing withdrawal device according to claim 1, characterized in that, The pull claw groove has radial limiting grooves at both ends, and pull claw limiting pins are provided at both ends of the pull claw. The pull claw limiting pins are installed in the radial limiting grooves.

3. The compact symmetrical assembly bushing withdrawal device according to claim 2, characterized in that, A limiting baffle is installed at the rear end of the annular shell, and a radial limiting groove is provided in the limiting baffle to match the limiting pin of the pull claw at the rear end.

4. The compact symmetrical assembly bushing withdrawal device according to any one of claims 1-3, characterized in that, The outer circumference of the annular shell is provided with a pull claw guide groove, and a corresponding pull claw positioning pin is provided on the pull claw.

5. The compact symmetrical assembly bushing withdrawal device according to any one of claims 1-3, characterized in that, The rear end of the shaft is provided with an internal hex wrench groove.

6. The compact symmetrical assembly bushing withdrawal device according to any one of claims 1-3, characterized in that, Multiple cam limiting pins are installed on the annular housing to block the front end of the annular cam.

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