CN112743483B

CN112743483B - Case disassembling tool and disassembling method

Info

Publication number: CN112743483B
Application number: CN201911053174.3A
Authority: CN
Inventors: 彭伟; 胡一廷; 郑思凯
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2022-07-12
Anticipated expiration: 2039-10-31
Also published as: CN112743483A

Abstract

A casing disassembly tool and method for disassembling a casing without damage to the casing due to hammering during disassembly of the casing are provided. The two ends of the decomposition tool screw rod are respectively provided with threads with different rotation directions, and the decomposition tool screw rod is also provided with a torsion applying part which is not shielded by the decomposition tool supporting frame; the upper top seat is provided with an upper guide hole matched with the guide shaft of the disassembling tool, an upper threaded hole matched with the thread at the upper end of the screw rod of the disassembling tool, and an upper positioning pin arranged on the upper top surface of the upper top seat and used for matching with a hole on the rear mounting edge of the second casing; the lower top seat is provided with a lower guide hole matched with the decomposition tool guide shaft, a lower threaded hole matched with the thread at the lower end of the decomposition tool screw rod, a lower positioning pin matched with a hole on the rear mounting edge of the first case of the decomposition tool and provided with a boss, and the boss of the decomposition tool is higher than the thickness of the front mounting edge of the second case and corresponds to the notch on the front mounting edge of the second case.

Description

Case disassembling tool and disassembling method

Technical Field

The invention relates to a case disassembling tool, in particular to a disassembling tool between two partial cases connected through a spigot.

Background

The casing is a main constituent part of an engine stator, part of the casing is a main bearing frame of the engine, and in order to ensure the coaxiality of the assembled casings, the casing 11 and the casing 12 are usually connected through an interference short spigot 13, as shown in fig. 1. The thrust-weight ratio is an important index of an engine, the thickness of a casing needs to be reduced as much as possible to reduce the weight of the casing on the premise that the casing ensures sufficient rigidity, the fit tightness of the

flange mounting edges

111 and 121 of the two casings shown in fig. 1 and 2 is about 0.1-0.15mm, the thickness L of the mounting edge 121 of the casing 2 is less than 5mm, if a jackscrew hole is arranged, the edge chamfer of the mounting hole is removed, the effective thickness is less than 3mm, and the

casings

11 and 12 cannot be disassembled through 2-3 threads, so that the illustrated engine is not provided with the jackscrew hole on the front mounting edge of the casing 12. The conventional disassembly operation is to hang the casing 12 by a crane, and the outer wall of the casing 11 is hammered downwards by a rubber hammer to realize the disassembly of the casing 12, which is likely to cause damage to the casing 11 in a disassembly mode.

Disclosure of Invention

The invention aims to provide a casing disassembling tool which is used for disassembling a casing and avoids damage to the casing caused by hammering in the process of disassembling the casing.

The invention aims to provide a disassembly method of a machine case.

A case disassembly tool is used for disassembling a first case and a second case, wherein the second case is provided with a front installation edge and a rear installation edge, the first case is provided with a rear installation edge, and the rear installation edge of the first case is connected with a front installation edge spigot of the second case; the device comprises a support frame, a guide shaft, a screw rod, an upper top seat and a lower top seat, wherein the guide shaft is fixed on the support frame; the screw rod is arranged on the support frame, can rotate but is constrained in axial movement, threads with different rotation directions are respectively arranged at two ends of the screw rod, and the screw rod is also provided with a torsion applying part which is not shielded by the support frame; the upper top seat is provided with an upper guide hole matched with the guide shaft, an upper threaded hole matched with the screw at the upper end of the screw rod, and an upper positioning pin arranged on the upper top surface of the upper top seat and used for matching with a hole on the rear mounting edge of the second casing; and the lower top seat is provided with a lower guide hole matched with the guide shaft, a lower threaded hole matched with the thread at the lower end of the screw rod, a lower positioning pin matched with a hole on the rear mounting edge of the first casing and a boss, and the boss is higher than the thickness of the front mounting edge of the second casing and corresponds to the notch on the front mounting edge of the second casing.

In one or more embodiments of the casing disassembling tool, the upper top surface is formed with an upper step surface, the upper step surface includes an upper step surface, an upper step vertical surface and an upper low step surface, and the upper step vertical surface of the upper step surface is an inner cylindrical surface for matching with a rear-mounted outer cylindrical surface of the second casing.

In one or more embodiments of the casing disassembling tool, the two guide shafts and the lead screw are distributed in a triangular shape and are arranged parallel to each other.

In one or more embodiments of the casing disassembling tool, the supporting frame is provided with two positioning pieces spaced up and down corresponding to the upper top seat, and the two positioning pieces are respectively used for limiting an upper stop point and a lower stop point of the movement of the upper top seat; the support frame is also provided with two positioning pieces which are spaced up and down corresponding to the lower top seat and are respectively used for limiting an upper stop point and a lower fulcrum of the movement of the lower top seat.

In one or more embodiments of the casing disassembling tool, the upper top seat or the lower top seat includes a seat plate and a shaft sleeve vertically protruding from one side of the seat plate, a reinforcing rib plate is connected between the shaft sleeve and the seat plate, the other side of the seat plate is provided with the upper top surface or the lower top surface, and a threaded hole matched with a screw rod is arranged in the shaft sleeve.

In one or more embodiments of the casing disassembling tool, the casing disassembling tool includes an axial constraint mechanism, where the axial constraint mechanism includes a gland protruding from the support frame, and a ring groove disposed on the lead screw corresponding to the gland;

the gland comprises a base body and a cover body, the base body and the cover body are detachably connected, and the base body and the cover body jointly define a hole through which the lead screw penetrates; the base body and the cover body are at least partially embedded into the annular groove, so that the axial restraint of the lead screw is realized.

In one or more embodiments of the casing disassembling tool, two axial restraining mechanisms are arranged on the supporting frame at intervals along the vertical direction.

In one or more embodiments of the casing disassembling tool, the supporting frame includes a vertical plate, an upper side plate and a lower side plate, an upper end of the vertical plate is connected to the upper side plate extending horizontally, and a lower end of the vertical plate is connected to the lower side plate extending horizontally; the upper side plate and the lower side plate are respectively provided with a limiting part corresponding to an upper stop point of the upper footstock and a limiting part corresponding to a lower stop point of the lower footstock; the vertical plate is provided with an upper positioning lug in a protruding mode on the lower side of the upper side plate, a lower positioning lug in a protruding mode on the upper side of the lower side plate, and the upper positioning lug and the lower positioning lug are respectively provided with a limiting part corresponding to the lower stop point of the upper top seat and a limiting part corresponding to the upper stop point of the lower top seat.

In one or more embodiments of the casing disassembling tool, a tightening window is provided on the vertical plate, the torsion applying portion is provided at a middle portion of the screw shaft, and the tightening window exposes the torsion applying portion so that the tightening tool penetrates the tightening window to apply torsion to the torsion applying portion.

In one or more embodiments of the casing disassembling tool, the number of the upper positioning pins and the lower positioning pins is two.

A casing disassembly method, which adopts a plurality of any one of the casing disassembly tools to execute the following steps:

loading a compressed casing decomposition tool into a groove formed by the rear mounting edge of the first casing and the rear mounting edge of the second casing, and aligning an upper positioning pin on the casing decomposition tool with a mounting hole on the rear mounting edge of the second casing and aligning a lower positioning pin with a mounting hole on the rear mounting edge of the first casing respectively;

screwing the screw rod to enable the upper top seat and the lower top seat to be in an open state, wherein the upper top surface of the upper top seat is attached to the rear mounting edge of the second casing, and the boss on the lower top surface of the lower top seat contacts the rear mounting edge of the first casing;

uniformly installing a plurality of casing disassembling tools in the circumferential direction of the first casing and the second casing;

according to the symmetry principle, the screw rods on the casing disassembling tools are repeatedly and slowly screwed one by one, and the second casing is ejected out of the inner mounting spigot of the first casing.

The upper and lower abutments can be moved toward or away from each other by applying rotation to the torque application portion of the lead screw by a wrench or other tool. When the casing disassembling tool is required to enter between the rear mounting edge of the first casing and the rear mounting edge of the second casing, the upper top seat and the lower top seat move oppositely to retract the tool. After the positioning pin and the lower positioning pin respectively enter the corresponding bolt holes of the rear mounting edge and the rear mounting edge, the casing disassembling tool is positioned. With the further rotation of the screw rod, the upper top surface contacts and abuts against the lower side surface of the rear mounting edge, and the boss of the lower top surface contacts and abuts against the part of the rear mounting edge exposed by the notch, so that the first casing and the second casing can be forced to be separated at the joint of the rear mounting edge and the front mounting edge.

It can be understood that the invention has the following beneficial effects:

1. the decomposition tool is simple to operate and high in decomposition efficiency;

2. the case cannot be damaged in the decomposition process;

3. the decomposing device has simple structure and low production cost.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and examples, in which:

fig. 1 is a sectional view schematically showing an engine case connection structure.

Fig. 2 is a perspective view of the engine case connection structure.

Fig. 3 is an installation diagram of the magazine disassembling tool.

FIG. 4 is a schematic view of a case disassembly tool distributed along an engine case.

Fig. 5 is a perspective view of the magazine disassembling tool.

Fig. 6 is a half sectional view of the magazine disassembling tool.

Fig. 7 is a perspective view of the lower top mount of the magazine disassembling tool.

Fig. 8 is a perspective view of a screw of the magazine disassembling tool.

Detailed Description

The following discloses a variety of different implementation or examples implementing the subject technology. Specific examples of components and arrangements are described below to simplify the present disclosure, but these are merely examples and do not limit the scope of the invention. For example, if a first feature is formed on or above a second feature in a description that follows, this may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that there may be no direct contact between the first and second features. Additionally, reference numerals and/or letters may be repeated among the various examples in this disclosure. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, when a first element is described as being coupled or coupled to a second element, the description includes embodiments in which the first and second elements are directly coupled or coupled to each other, as well as embodiments in which one or more additional intervening elements are added to indirectly couple or couple the first and second elements to each other.

As shown in fig. 3 and 4, the first casing 21 and the second casing 22 are partially shown, respectively. The casing disassembling tool is used for disassembling the first casing 21 and the second casing 22, the second casing 22 is provided with a front mounting edge 221 and a rear mounting edge 222, the first casing 21 is provided with a rear mounting edge 212, and the rear mounting edge 212 of the first casing 1 is connected with the front mounting edge 221 of the second casing 22 in a spigot mode. The front mounting edge 221 is formed with a slit 223, the slit 223 exposes the rear mounting edge 212, and the rear mounting edge 212 exposed by the slit 223 become an upper force application point and a lower force application point of the magazine disassembling tool 3, respectively. As will be understood later, the lower end of the casing disassembling tool 3 abuts against the exposed portion of the first casing 21 at the notch 223, and the other end of the upper end abuts against the rear mounting edge 222 of the second casing 22, so that the casing is disassembled by the reaction force generated between the two casings of the casing disassembling tool.

As shown in fig. 5 and 6, the casing disassembling tool 3 includes a support frame 31, a guide shaft 32, a lead screw 33, an upper head 34, and a lower head 35. The support frame 31 is provided as a support base of the casing disassembling tool 3. The guide shaft 32 is fixed to the support frame 31.

The positional and orientational terms of the casing, such as up and down, to be described later and described above, are based on the orientation of the casing shown in fig. 3 and 4, and the positional and orientational terms of the casing may vary, and thus these orientational terms are mainly used for distinguishing purposes and not intended to be limiting in nature.

The screw 33 is disposed on the supporting frame 31 and is rotationally but axially constrained, as shown in fig. 8, the screw 33 has

threads

331 and 333 with different rotation directions at two ends, and further has a torsion applying portion 332, it will be understood later that the torsion applying portion 332 is disposed so as not to be shielded by the supporting frame 31. The torsion applying portion 332 of the screw 33 is disposed in the middle of the screw 33, but not limited thereto, and may protrude from the upper end or the lower end of the screw 33, so that the support frame 31 can be shielded to facilitate the application of force. A preferable configuration is that two sides of the rolling screw rod adopt T-shaped threads with different rotation directions, so that a larger axial force can be borne during the decomposition process, and the upper and lower jacking seats can move in different directions.

The upper top holder 34 has an upper guide hole 341 to be fitted to the guide shaft 32, and has an upper screw hole 342 to be fitted to a screw thread 333 of the screw shaft 33 at the upper end, and the upper top surface 340 thereof forms an upper step surface including an upper step surface 3401, an upper step elevation 3402 and an upper step elevation 3403, the upper step elevation 3403 of the upper step surface being provided with an upper positioning pin 343 to be fitted to the hole 224 of the rear mounting edge 222 of the second casing 22, and the upper step elevation 3402 of the upper step surface being an inner cylindrical surface to be fitted to an outer cylindrical surface 225 of the rear mounting edge 222 of the second casing 22. It will be understood later that the quick positioning connection of the disassembling tool and the two casings is realized by the matching of the double positioning pin 343 and the cylindrical surface.

The lower top mount 35 has a lower guide hole 351 for engaging the guide shaft 32, a lower threaded hole 352 for engaging the threads 331 of the lower end of the screw shaft 32, and a lower top surface 350 provided with a lower positioning pin 353 for engaging a hole (hidden in fig. 3 and aligned with the hole 226) in the rear mounting edge 212 of the first casing 21, and a boss 354, the boss 354 having a height greater than the thickness of the front mounting edge 221 of the second casing 22 and corresponding to the cutout 223 in the front mounting edge 221 of the second casing 22.

The torque application portion 332 of the lead screw 33 is rotated by a wrench or other tool, whereby the upper and lower footstocks 34 and 35 can be moved toward or away from each other. When the casing disassembly tool 3 is required to enter between the rear mounting edge 212 of the first casing 21 and the rear mounting edge 222 of the second casing 22, the upper top seat 34 and the lower top seat 35 are moved towards each other to retract the tool. After the machine box disassembly tool enters a station, the screw 33 is rotated reversely, the upper top seat 34 and the lower top seat 35 move reversely, and the upper positioning pin 343 and the lower positioning pin 353 enter the corresponding bolt holes of the rear installation edge 212 and the rear installation edge 222 respectively to position the machine box disassembly tool. With further rotation of the screw 33, the upper low-step surface 3403 of the upper top surface 340 contacts and abuts against the lower side surface of the rear mounting edge 222, and the boss 354 of the lower top surface 350 contacts and abuts against the portion of the rear mounting edge 212 exposed by the notch 223, so that the first casing 21 and the second casing 22 can be forced to separate at the joint of the rear mounting edge 212 and the front mounting edge 221.

Although the embodiments of the casing disassembly tool have been described in detail with reference to the accompanying drawings, there are variations or modifications to the embodiments and further details of the embodiments.

In a preferred embodiment, two guide shafts 32 and the lead screw 33 are arranged in a triangular shape and parallel to each other. The double-guide shaft and the lead screw can be abstracted into three points, a plane is determined according to the three points, the force-bearing planes of the upper and lower jacking seats are always kept parallel, and the risk that the jacking tool is inclined in the disassembling process is avoided. The lead screw can be selected from a rolling lead screw, so that the operation is smooth and stable.

Another preferred embodiment is to provide the upper top seat 34 or the lower top seat 35 with two positioning members spaced up and down, respectively. The supporting frame 31 is provided with two positioning

members

361, 363 spaced up and down corresponding to the upper top seat 34, which are respectively used for limiting the upper dead point and the lower dead point of the movement of the upper top seat 34. The supporting frame 31 is also provided with two positioning

members

364, 362 spaced up and down corresponding to the lower top seat 35, which are respectively used for limiting the upper dead point and the lower fulcrum of the movement of the lower top seat 35. Due to the action of the two positioning elements, the upper top seat 34 or the lower top seat 35 can only move within the range H shown in FIG. 6, thereby reducing the operation time of the extension type top tool and improving the disassembly efficiency of the cartridge receiver.

Fig. 7 shows a perspective view of the lower header turned 180 degrees upside down. The lower top seat 35 includes a lower seat plate 355 and a shaft sleeve 357 vertically protruded from one side of the lower seat plate 355, a rib 356 is connected between the shaft sleeve 357 and the seat plate 355, a lower top surface 350 is disposed on the other side of the seat plate 355, and a threaded hole for engaging with the screw 32 is disposed in the shaft sleeve 357. The rigidity of the seat deck is increased by the reinforcement ribs 356. Two lower positioning pins 353 and two bosses 354 are arranged on the lower top surface 350, the positioning can be rapidly performed through the double positioning pins 353, and the abutting force exerted on the rear mounting edge 212 by the double bosses 354 is more uniform. The lower seat plate 355 also includes double guide holes 351, with double guide holes 351 and double bosses 354 on either side of the threaded hole 352.

With continued reference to fig. 5 and 6, the casing disassembling tool includes an axial restraining mechanism including a gland 39 protruding from the support frame 31, and a pair of collars 335 spaced apart up and down on the lead screw 32 corresponding to the gland 39.

The gland 39 includes a body 391 and a cover 392, the body 391 and cover 392 being removably connected, one way of connection being by fasteners 38. The base 391 and the cover 392 together define a hole through which the lead screw 32 passes; a pair of collars 335, which are disposed in correspondence with the gland 39, define between them an annular groove in which the seat 391 and the cover 392 at least partially engage, thereby achieving an axial constraint of the screw 32, such that the screw 32 can only rotate circumferentially but cannot move axially. In fig. 5 and 6, the axial restraint mechanism is provided at two positions spaced apart in the vertical direction on the support frame 31. The axial restraint also acts as a support for the lead screw 32.

The supporting frame 31 includes a vertical plate, an upper side plate and a lower side plate, the upper side plate and the lower side plate are the positioning

members

361 and 362 respectively, the upper end of the vertical plate is connected with the upper side plate extending horizontally, and the lower end of the vertical plate is connected with the lower side plate extending horizontally. The upper side plate and the lower side plate are respectively provided with a limiting part corresponding to an upper stop point of the upper footstock and a limiting part corresponding to a lower stop point of the lower footstock. The vertical plate protrudes from the lower side of the upper side plate to form a positioning lug, and protrudes from the upper side of the lower side plate to form a lower positioning lug, the upper positioning lug and the lower positioning lug are respectively provided with a limiting part 363 corresponding to the lower dead point of the upper footstock and a limiting part 364 corresponding to the upper dead point of the lower footstock. The support bracket 31 thus provides a compact, low-footprint structure for supporting the case disassembly tool.

As shown in fig. 6, a tightening window 310 is provided on a vertical plate of the support bracket 31, and as shown in fig. 3 and 8, a torsion force applying portion 332 is provided at a middle portion of the lead screw 32, and the tightening window 310 exposes the torsion force applying portion 332 so that a tightening tool penetrates the torsion force applying portion through the tightening window to apply torsion force thereto. The shape of the tightening window 310 is not limited to a square window, but may be C-shaped or other shapes.

According to the aforementioned case disassembly tool, with reference to fig. 3 and 4, it can be understood that a case disassembly method performs the following steps:

the compressed casing disassembling tool 3 is loaded into a groove formed between the rear mounting edge 212 of the first casing 21 and the rear mounting edge 222 of the second casing 22, and the upper positioning pin 343 on the disassembling tool and the mounting hole 224 and the lower positioning pin 353 on the rear mounting edge 222 of the second casing 22 are respectively aligned with the mounting holes on the rear mounting edge 212 of the first casing 21;

the upper top seat and the lower top seat are in an open state by screwing the screw rod 32, the upper top surface 340 of the upper top seat 34 is attached to the rear mounting edge 222 of the second casing 22, and the boss 354 of the lower top surface 350 of the lower top seat 35 is in contact with the rear mounting edge 212 of the first casing 21;

a plurality of disassembling tools 3 are uniformly arranged on the circumferential direction of the first casing 21 and the second casing 22;

according to the principle of symmetry, the screw 32 on each casing disassembling tool 3 is repeatedly and slowly screwed to eject the second casing 22 out of the inner mounting spigot of the first casing 21.

Although the present invention has been disclosed in terms of preferred embodiments, it is not intended to be limited thereto, and variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are within the scope of the present invention defined by the claims.

Claims

1. The device comprises a casing disassembling tool, a first casing, a second casing and a third casing, wherein the casing disassembling tool is used for disassembling the first casing and the second casing, the second casing is provided with a front mounting edge and a rear mounting edge, the first casing is provided with a rear mounting edge, and the rear mounting edge of the first casing is connected with a front mounting edge spigot of the second casing; it is characterized by comprising:

a support frame;

the guide shaft is fixed on the support frame;

the screw rod is arranged on the support frame, can rotate but is constrained in axial movement, threads with different rotation directions are respectively arranged at two ends of the screw rod, and the screw rod is also provided with a torsion applying part which is not shielded by the support frame;

the upper top seat is provided with an upper guide hole matched with the guide shaft, an upper threaded hole matched with the screw at the upper end of the screw rod, and an upper positioning pin arranged on the upper top surface of the upper top seat and used for matching with a hole on the rear mounting edge of the second casing; and

the lower top seat is provided with a lower guide hole matched with the guide shaft and a lower threaded hole matched with the thread at the lower end of the screw rod, a lower positioning pin is arranged on the lower top surface of the lower top seat and matched with a hole on the rear mounting edge of the first casing, and a boss is arranged on the lower top surface of the lower top seat, is higher than the thickness of the front mounting edge of the second casing and corresponds to an opening groove on the front mounting edge of the second casing.

2. A casing disassembly tool as claimed in claim 1, wherein said upper top surface is formed with an upper step surface comprising an upper step surface, an upper step elevation and an upper step surface, said upper step elevation of said upper step surface being an inner cylindrical surface for mating with a rear mounted outer cylindrical surface of a second casing.

3. The case disassembly tool of claim 1, wherein said two guide shafts and said lead screw are disposed in a triangular shape and parallel to each other.

4. The case disassembly tool of claim 1, wherein the supporting frame is provided with two positioning members spaced up and down corresponding to the upper top seat, for respectively defining an upper stop point and a lower stop point of the movement of the upper top seat; the support frame is also provided with two positioning pieces which are spaced up and down corresponding to the lower top seat and are respectively used for limiting an upper stop point and a lower fulcrum of the movement of the lower top seat.

5. The disassembling tool for the barrel according to claim 1, wherein said upper top seat or said lower top seat includes a seat plate and a boss vertically protruded on one side of said seat plate, a reinforcement rib is connected between said boss and said seat plate, said upper top surface or said lower top surface is provided on the other side of said seat plate, and a screw hole engaged with a screw is provided in said boss.

6. The casing disassembling tool according to claim 1, wherein the casing disassembling tool includes an axial restraining mechanism, the axial restraining mechanism includes a gland protruding from the support frame, and a ring groove provided on the lead screw corresponding to the gland;

7. The case disassembly tool of claim 6, wherein two axial restraining mechanisms are provided on the support frame at intervals in an up-down direction.

8. The case disassembly tool of claim 4, wherein the support bracket comprises a vertical plate and upper and lower side plates, the vertical plate having an upper end connected to the upper side plate extending horizontally and a lower end connected to the lower side plate extending horizontally; the upper side plate and the lower side plate are respectively provided with a limiting part corresponding to an upper stop point of the upper footstock and a limiting part corresponding to a lower stop point of the lower footstock; the vertical plate is provided with an upper positioning lug in a protruding mode on the lower side of the upper side plate, a lower positioning lug in a protruding mode on the upper side of the lower side plate, and the upper positioning lug and the lower positioning lug are respectively provided with a limiting part corresponding to the lower stop point of the upper top seat and a limiting part corresponding to the upper stop point of the lower top seat.

9. The case disassembly tool of claim 8, wherein a tightening window is provided on the riser, the torque application portion is provided at a middle portion of the lead screw, and the tightening window exposes the torque application portion so that a tightening tool piercing the tightening window applies a torque at the torque application portion.

10. The case disassembly tool of claim 8, wherein the number of the upper positioning pin and the lower positioning pin is two, respectively.

11. A method of disassembling a casing, characterized in that a plurality of casing disassembling tools according to any one of claims 1 to 10 are used to perform the following steps: