CN216781607U - Centering device - Google Patents
Centering device Download PDFInfo
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- CN216781607U CN216781607U CN202220384670.8U CN202220384670U CN216781607U CN 216781607 U CN216781607 U CN 216781607U CN 202220384670 U CN202220384670 U CN 202220384670U CN 216781607 U CN216781607 U CN 216781607U
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- connecting member
- centering device
- guide shaft
- driving
- shaft
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Abstract
The utility model provides a centering device, which relates to the field of engine assembly, and comprises: the extension mechanism comprises a first connecting member and a second connecting member, wherein the center of the first connecting member is pivoted to the center of the second connecting member and used for fixing the centering device in an extension state, and the drive mechanism is used for driving the extension mechanism to radially extend or contract. In this scheme, through setting up the guiding axle, conveniently guide the work piece, can realize the accurate centering installation of work piece, expansion mechanism can play the fixed action in the expansion state, and expansion mechanism adopts the mode of two connecting elements center pin joints, sets up along the axial of guiding axle, and is structural compacter, reliable, can reduce to scrape and bump the damage part.
Description
Technical Field
The utility model relates to the field of engine assembly, in particular to a centering device.
Background
As shown in fig. 1, the low pressure fulcrum assembly 100 'is used for connecting a fan rotor and a low pressure turbine rotor of an aircraft engine, and is installed on an intermediate casing 400', the installation position of the low pressure fulcrum assembly is about 1000mm away from the front installation edge of the fan casing 300 ', a labyrinth 500' structure is formed by a sealing ring at the tail end and a labyrinth on a front shaft of a compressor, and the radial gap is small and is about 0.2 mm. The low-pressure fulcrum assembly 100 'is installed in a horizontal hoisting mode, the connecting position of the low-pressure fulcrum assembly is located inside the fan casing 300', the installation is invisible, the radial clearance of the labyrinth seal 500 'is small, accurate centering is difficult to achieve in the horizontal hoisting process of a crane, and during non-centering installation, the labyrinth on the front shaft of the gas compressor and a seal ring at the rear end of the low-pressure fulcrum assembly 100' are scraped to cause damage to the labyrinth, so that sealing failure is caused.
To achieve accurate centering of the low pressure fulcrum assembly 100', a secondary centering device is required, and a conventional secondary centering device is usually fixed to a part or assembly, and extends the axis of a shaft or hole in the part or assembly to match with a hole or shaft feature in another part or assembly to form a guide structure for guiding the two parts or assemblies to be accurately centered and assembled. Because the shape of the inner hole of the low-pressure fulcrum assembly 100 ' is complex, the minimum aperture is smaller than the aperture of the inner hole of the compressor front shaft 600 ', and in addition, the characteristic fixing auxiliary centering device which is easy to connect, such as no thread, is arranged on the compressor front shaft 600 '.
The existing auxiliary centering device has the following problems: the centering device does not have a guide part for a workpiece, is not easy to perform centering guide, is not compact in structure, and is easy to scrape and collide with internal parts to cause part damage.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects that the centering device in the prior art is not easy to perform centering guide, is not compact in structure and is easy to scrape and touch internal parts, and further provides the centering device.
The utility model solves the technical problems through the following technical scheme:
a centering device, comprising:
a guide shaft that guides the workpiece by being engaged with the workpiece forming shaft hole;
an expansion mechanism disposed along an axial direction of the guide shaft, the expansion mechanism including a first connecting member and a second connecting member, a center of the first connecting member being pivotally connected to a center of the second connecting member for fixing the centering device in an expanded state;
a drive mechanism for driving the expansion mechanism to radially expand or contract.
In this scheme, through setting up the aiming axis, conveniently guide the work piece, can realize the accurate centering installation of work piece. The expansion mechanism can play a role in fixing in an expansion state, and is driven to expand or contract through the driving mechanism, so that the expansion mechanism is simple to fix and is easy to take out after installation is completed. The expanding mechanism adopts the mode of two connecting element center pin joints, sets up along the axial of aiming at the axle, and is structural compacter, reliable, can reduce to scrape and bump damage part.
Preferably, the first and second connecting members have the same length.
In this scheme, two connecting elements length is the same, and is more stable in the structure.
Preferably, the drive mechanism comprises:
the screw rod has different rotation directions, and the screw rod and the guide shaft are coaxially arranged;
the first screw nut and the second screw nut are respectively sleeved in the areas of the screw rod with different rotation directions.
In the scheme, when the screw rod rotates, the moving directions of the first screw nut and the second screw nut are opposite, and the screw thread driving has self-locking performance, so that the expansion angle of the expansion mechanism can be maintained.
Preferably, the driving mechanism further comprises a driving rod, the guide shaft is sleeved on the outer peripheral side of the driving rod, the tail end of the driving rod is coaxially connected with the screw rod, and the driving rod is used for driving the screw rod to rotate.
In this scheme, it is rotatory to drive the lead screw through the actuating lever, and the drive mode is simple to the actuating lever setting does not occupy the radial space of guiding axle in the inside of guiding axle, is difficult for bumping with outside part.
Preferably, the first nut and the second nut are respectively located at two ends of the pivot point and are used for driving the first connecting member and the second connecting member to rotate around the pivot point.
In this scheme, first nut and second nut drive first connecting element and second connecting element simultaneously, and the rotation of first connecting element and second connecting element has the synchronism, can guarantee that the tip of first connecting element and second connecting element extrudees outside part simultaneously, realizes fixedly.
Preferably, the first connecting member includes a first receiving portion through which the lead screw passes, and the second connecting member includes a second receiving portion through which the first connecting member and the lead screw pass.
In this aspect, the first connecting member and the second connecting member do not interfere with the lead screw and with each other during expansion and contraction.
Preferably, the centering device further includes a mounting seat and a pivot shaft, the mounting seat is disposed at a distal end of the guide shaft, the mounting seat has a third accommodating portion penetrating therethrough, and the expanding mechanism is fixed in the third accommodating portion by the pivot shaft.
In this scheme, the mount pad has played the fixed action for the expanding mechanism.
Preferably, an outer diameter of the mount is not greater than an outer diameter of the guide shaft.
Preferably, an outer diameter of the expanding mechanism in the contracted state is not larger than an outer diameter of the guide shaft.
In the scheme, the centering device is convenient to put in and take out.
Preferably, the outer diameter of the guide shaft is smaller than the inner diameter of the workpiece by 0.05 to 0.1 mm.
In the scheme, the shaft holes with small gaps are matched, so that the centering assembly of the workpiece is favorably guided.
The positive progress effects of the utility model are as follows: in this scheme, through setting up the aiming axis, conveniently guide the work piece, can realize the accurate centering installation of work piece. The expansion mechanism can play a role in fixing in an expansion state, and is driven to expand or contract by the driving mechanism, so that the expansion mechanism is simple to fix and is easy to take out after installation. The expanding mechanism adopts a mode of central pivot joint of two connecting members, is arranged along the axial direction of the guide shaft, is more compact in structure, and can reduce scraping and damaging parts.
Drawings
FIG. 1 is a schematic view of a prior art engine low pressure pivot assembly connection;
FIG. 2 is a schematic structural diagram of a centering device according to a preferred embodiment of the present invention;
FIG. 3 is a cross-sectional view of a centering device according to a preferred embodiment of the present invention;
FIG. 4 is a partial structural view of a centering device according to a preferred embodiment of the present invention;
FIG. 5 is a schematic view of a centering device according to a preferred embodiment of the present invention.
First connecting member 410
The first accommodation part 411
Second connecting member 420
Screw 500
Low pressure fulcrum assembly front axle aperture 710
Detailed Description
The present invention will be more clearly and completely described in the following description of preferred embodiments, taken in conjunction with the accompanying drawings.
As shown in fig. 2 to 5, in the present embodiment, a centering device includes:
and a guide shaft 100, the guide shaft 100 guiding the workpiece by engaging with the workpiece forming shaft hole.
And an expansion mechanism 400, the expansion mechanism 400 being disposed along an axial direction of the guide shaft 100, the expansion mechanism 400 including a first connection member 410 and a second connection member 420, a center of the first connection member 410 being pivoted to a center of the second connection member 420 for fixing the centering device in an expanded state.
A driving mechanism for driving the expanding mechanism 400 to radially expand or contract.
Specifically, as shown in fig. 2, 3 and 5, the guide shaft 100 and the front shaft hole 710 of the low pressure fulcrum assembly form a shaft hole fit to guide the low pressure fulcrum assembly, the expansion mechanism 400 is close to the end position of the guide shaft 100, when the expansion mechanism 400 is in an expanded state, the inner hole of the compressor front shaft 720 is pressed, and then the centering device is fixed, after the installation is completed, the driving mechanism controls the expansion mechanism 400 to contract, the radial contour size of the contracted expansion mechanism 400 is smaller than the diameter of the front shaft hole 710 of the low pressure fulcrum assembly, and then the centering device can be taken out of the low pressure fulcrum assembly.
In the scheme, the guide shaft 100 is arranged, so that the workpiece is conveniently guided, and the workpiece can be accurately centered and installed. The expansion mechanism 400 can play a role in fixing in the expanded state, and is driven to expand or contract by the driving mechanism, so that the fixing is simple, and the expansion mechanism is easy to take out after being installed. The expansion mechanism adopts the mode of two connecting element center pin joints, sets up along the axial of guiding axle, and is structural compacter, reliable, can reduce to scrape and bump damage part.
In the present embodiment, as shown in fig. 3 and 4, the first and second connection members 410 and 420 have the same length. In this scheme, two connecting elements length is the same, and is more stable in the structure.
In other embodiments, the lengths of the first connecting member 410 and the second connecting member 420 may be different, and the fixing function can be achieved.
In the present embodiment, the drive mechanism includes:
a lead screw 500, the lead screw 500 having different rotation directions, the lead screw 500 being coaxially disposed with the guide shaft 100;
the first nut 610 and the second nut 620 are respectively sleeved on the areas of the screw rod 500 with different rotation directions. When the screw rod 500 rotates, the first nut 610 and the second nut 620 move in opposite directions, and the screw driving has self-locking property, so that the expansion angle of the expansion mechanism 400 can be maintained.
The driving mechanism further comprises a driving rod 200, the guide shaft 100 is sleeved on the periphery of the driving rod 200, the tail end of the driving rod 200 is coaxially connected with the screw rod 500, and the driving rod 200 is used for driving the screw rod 500 to rotate.
In this embodiment, the first nut 610 and the second nut 620 are respectively located at two ends of the pivot point for driving the first connecting member 410 and the second connecting member 420 to rotate around the pivot point. The first nut 610 and the second nut 620 simultaneously drive the first connection member 410 and the second connection member 420, and the rotation of the first connection member 410 and the second connection member 420 has synchronicity, so that it can be ensured that the ends of the first connection member 410 and the second connection member 420 simultaneously press the external part to achieve fixation.
Specifically, the driving rod 200 is rotated to rotate the lead screw, so as to drive the first nut 610 and the second nut 620 to move. When the axial distance between the first nut 610 and the second nut 620 becomes larger, the angle between the first coupling member 410 and the second coupling member 420 becomes smaller on one axial side, and the expanding mechanism 400 is contracted. When the axial distance between the first nut 610 and the second nut 620 is decreased, the angle between the first coupling member 410 and the second coupling member 420 on one axial side is increased, and the expanding mechanism 400 is expanded.
In other embodiments, the driving mechanism may also adopt an electric push rod, and the electric push rod is disposed at one end or both ends of the pivot point, and the end of the electric push rod is connected to the end surface of the first connecting member 410 and the end surface of the second connecting member 420 on the same side, so that the first connecting member 410 and the second connecting member 420 can be synchronously driven to contract or expand by the contraction of the electric push rod.
In the present embodiment, as shown in fig. 4, the first connecting member 410 includes a first receiving portion 411, the screw rod 500 passes through the first receiving portion 411, the second connecting member 420 includes a second receiving portion 421, and the first connecting member 410 and the screw rod 500 pass through the second receiving portion 421. The first and second connection members 410 and 420 do not interfere with the lead screw and with each other during expansion and contraction.
As shown in fig. 2, the centering device further includes a mounting base 300 and a pivot shaft 430, the mounting base 300 is disposed at the end of the guide shaft 100, the mounting base 300 has a third receiving portion 310 penetrating therethrough, and the expanding mechanism 400 is fixed in the third receiving portion 310 by the pivot shaft 430. The mount 300 provides a secure function for the expansion mechanism 400.
In the present embodiment, the outer diameter of the mount 300 is not greater than the outer diameter of the guide shaft 100.
In the present embodiment, the outer diameter of the expanding mechanism 400 in the contracted state is not larger than the outer diameter of the guide shaft 100. The centering device is convenient to put in and take out.
In the present embodiment, the outer diameter of the guide shaft 100 is smaller than the inner diameter of the workpiece by 0.1 mm. The shaft holes with small gaps are matched, so that the centering assembly of the workpiece is guided.
In other embodiments, the outer diameter of the guide shaft 100 may also be 0.05-0.1mm smaller than the inner diameter of the workpiece.
Claims (10)
1. A centering device, comprising:
a guide shaft that guides the workpiece by being engaged with the workpiece forming shaft hole;
an expansion mechanism disposed along an axial direction of the guide shaft, the expansion mechanism including a first connecting member and a second connecting member, a center of the first connecting member being pivotally connected to a center of the second connecting member for fixing the centering device in an expanded state;
a drive mechanism for driving the expansion mechanism to radially expand or contract.
2. The centering device of claim 1, wherein said first connecting member and said second connecting member are the same length.
3. The centering device of claim 1, wherein said drive mechanism comprises:
the screw rod has different rotation directions, and the screw rod and the guide shaft are coaxially arranged;
the first screw nut and the second screw nut are respectively sleeved in the areas of the screw rod with different rotation directions.
4. The centering device as claimed in claim 3, wherein said driving mechanism further comprises a driving rod, said guiding shaft is fitted around an outer circumference side of said driving rod, a tip of said driving rod is coaxially connected to said screw rod, and said driving rod is configured to rotate said screw rod.
5. The centering device of claim 3, wherein the first nut and the second nut are located at opposite ends of a pivot point for driving the first connecting member and the second connecting member to rotate about the pivot point.
6. The centering device of claim 5, wherein said first connecting member includes a first receiving portion through which said lead screw passes, said second connecting member includes a second receiving portion through which said first connecting member and said lead screw pass.
7. The centering device of claim 1, further comprising a mounting seat disposed at a distal end of said guide shaft, said mounting seat having a third receiving portion therethrough, a pivot shaft, said expansion mechanism being secured within said third receiving portion by said pivot shaft.
8. The centering device of claim 7, wherein an outer diameter of said mounting block is not greater than an outer diameter of said guide shaft.
9. The centering device of claim 1, wherein an outer diameter of said expansion mechanism in a contracted state is not greater than an outer diameter of said guide shaft.
10. The centering device of claim 1, wherein an outer diameter of said guide shaft is 0.05-0.1mm smaller than an inner diameter of said workpiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220384670.8U CN216781607U (en) | 2022-02-24 | 2022-02-24 | Centering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220384670.8U CN216781607U (en) | 2022-02-24 | 2022-02-24 | Centering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216781607U true CN216781607U (en) | 2022-06-21 |
Family
ID=82017849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220384670.8U Active CN216781607U (en) | 2022-02-24 | 2022-02-24 | Centering device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216781607U (en) |
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2022
- 2022-02-24 CN CN202220384670.8U patent/CN216781607U/en active Active
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