CN110763180B - Method for measuring dimension of small step surface of slender shaft of cantilever - Google Patents
Method for measuring dimension of small step surface of slender shaft of cantilever Download PDFInfo
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- CN110763180B CN110763180B CN201911072874.7A CN201911072874A CN110763180B CN 110763180 B CN110763180 B CN 110763180B CN 201911072874 A CN201911072874 A CN 201911072874A CN 110763180 B CN110763180 B CN 110763180B
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- shaft
- step surface
- face
- measuring
- fixing frame
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/16—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring distance of clearance between spaced objects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
Abstract
A method for measuring the dimension of a small step surface of a cantilever slender shaft comprises the following steps: step A, providing a positioning shaft, sleeving the positioning shaft into a long shaft of the power turbine, enabling an inner circle step surface to be tightly attached to an installation step surface of an adjusting pad, rotating the positioning shaft, enabling a measuring plate to be located above the honeycomb end surface of the guider, utilizing a depth gauge to be arranged on a working surface of the measuring plate, measuring to obtain a distance L2 from the measuring plate to the honeycomb end surface of the guider, and then according to a formula: L1-L2 obtains the dimension L1 of the trim pad mounting step face to the deflector honeycomb end face. According to the method for measuring the size of the small step surface of the slender shaft of the cantilever, the special tool is designed, so that the structural size relation of the cantilever beam which is difficult to directly and accurately measure is converted into the size relation of the fixed characteristic surface, and therefore the measurement precision and the measurement efficiency are greatly improved.
Description
Technical Field
The invention relates to the technical field of aero-engine assembly, in particular to a method for measuring the size of a small step surface of a cantilever slender shaft in the assembling process of a turboprop engine
Background
Fig. 1 is a schematic cross-sectional structure diagram of an assembled state of a turboprop engine, and as shown in fig. 1, in a general assembly process of a certain turboprop engine, after a long shaft 100 of a power turbine is assembled, a distance L1 between an installation step surface 101 (the radial dimension is only 2.72mm) of an adjusting pad on the long shaft and a honeycomb end surface of a guider needs to be measured, so as to calculate an axial gap between the honeycomb end surface and a rotor blade crown of an object part to check whether a gap between a rotor and a stator of the engine meets a design value, and ensure that the engine does not have collision and abrasion in a running process.
In the state that only the power turbine long shaft 100 is installed, a support structure exists in the position of the power turbine long shaft 100, which is far (300 and 500mm) below the adjusting pad installation step surface 101 shown in fig. 1, that is, the tail end of the power turbine long shaft 100 is in a cantilever state and swings radially greatly, and because the size of the adjusting pad installation step surface 101 is small, when the depth gauge is directly used for measuring the size of L1 from the adjusting pad installation step surface 101 to the honeycomb end surface of the guider, the side head of the depth gauge can only contact the edge of the step surface, so that the data difference is large in the measuring process and the data is unstable.
Disclosure of Invention
The invention aims to provide a method for measuring the dimension of a small step surface of a cantilever slender shaft, so as to reduce or avoid the problems.
In order to solve the technical problem, the invention provides a method for measuring the size of a small step surface of a cantilever slender shaft, which is used for measuring the distance L1 between the installation step surface of an adjusting pad and the honeycomb end surface of a guider after the long shaft of a power turbine is installed in the general assembly process of a turboprop engine, and comprises the following steps:
step A, providing a positioning shaft, wherein the positioning shaft is provided with an inner circle step surface which is used for being attached to the installation step surface of the adjusting pad, the bottom of the positioning shaft is provided with a process bearing which is used for being matched with an assembled engine component, a measuring plate which is fixedly connected with the positioning shaft is arranged above the inner circle step surface,
and sleeving the positioning shaft into the long shaft of the power turbine, so that the inner circle step surface is tightly attached to the mounting step surface of the adjusting pad, and the technical bearing is ensured to be matched with the assembled engine assembly. And the distance L between the working surface of the measuring plate and the inner circle step surface in the axial direction of the long shaft of the power turbine is a fixed value.
Step B, rotating the positioning shaft to enable the measuring plate to be located above the honeycomb end face of the guider, utilizing a depth gauge to be arranged on the working surface of the measuring plate, measuring to obtain a distance L2 between the measuring plate and the honeycomb end face of the guider, and then according to a formula: L1-L2 obtains the dimension L1 of the trim pad mounting step face to the deflector honeycomb end face.
Preferably, in the step B, a fixing frame is provided, the fixing frame is of a cylindrical sleeve structure, the fixing frame can be sleeved on the long shaft of the power turbine and attached to the top end of the positioning shaft, three fixing beams are uniformly distributed on the fixing frame, and the fixing beams are used for being connected with the end face of the assembled engine component through bolts. The pressing force on the positioning shaft can be increased or reduced by adjusting the vertical position of the fixing frame, so that the inner circle step surface is tightly attached to the mounting step surface of the adjusting pad.
Preferably, in the step B, an adjusting bolt is provided, the adjusting bolt is provided with a positioning pressing block for being attached to the end face of the long shaft of the power turbine, and a bolt rotatably connected to the positioning pressing block, when the adjusting bolt is used, the fixing frame and the bolt are firstly connected through threads, then the three fixing beams of the fixing frame are connected to the end face of the assembled engine component through bolts, and then the bolt is rotated until the positioning pressing block is closely attached to the end face of the long shaft of the power turbine, and then when the height of the fixing frame needs to be adjusted, only a fixing nut on the bolt needs to be rotated.
According to the method for measuring the size of the small step surface of the slender shaft of the cantilever, the special tool is designed, so that the structural size relation of the cantilever beam which is difficult to directly and accurately measure is converted into the size relation of the fixed characteristic surface, and therefore the measurement precision and the measurement efficiency are greatly improved.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein the content of the first and second substances,
FIG. 1 is a schematic sectional view of a turboprop in an assembled state;
FIG. 2 is a schematic diagram illustrating a measurement principle of a measurement method for a small step surface of a cantilever slender shaft according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of the positioning shaft of FIG. 2;
FIG. 4 is a schematic perspective view of the measurement plate of FIG. 3;
FIG. 5 is a schematic top view of the fixing frame of FIG. 2;
fig. 6 is a schematic structural diagram of the adjusting bolt of fig. 2.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.
FIG. 1 is a schematic sectional view of a turboprop in an assembled state; FIG. 2 is a schematic diagram illustrating a measurement principle of a measurement method for a small step surface of a cantilever slender shaft according to an embodiment of the invention; FIG. 3 is a schematic structural diagram of the positioning shaft of FIG. 2; FIG. 4 is a schematic perspective view of the measurement plate of FIG. 3; FIG. 5 is a schematic top view of the fixing frame of FIG. 2; fig. 6 is a schematic structural diagram of the adjusting bolt of fig. 2. Referring to fig. 1-6, the invention provides a method for measuring the dimension of a small step surface of a cantilever slender shaft, which is used for measuring the distance L1 between a mounting step surface 101 of an adjusting pad and the honeycomb end surface of a guider after a long shaft 100 of a power turbine is mounted in the overall assembly process of a turboprop engine, and comprises the following steps:
step A, providing a positioning shaft 2, wherein the positioning shaft 2 is provided with an inner circle step surface 21 which is used for being attached to the adjusting pad installation step surface 101, the bottom of the positioning shaft 2 is provided with a process bearing 3 which is used for being matched with an assembled engine assembly, a measuring plate 4 which is fixedly connected with the positioning shaft 2 is arranged above the inner circle step surface 21,
and sleeving the positioning shaft 2 into the power turbine long shaft 100, so that the inner circle step surface 21 is tightly attached to the adjusting pad installation step surface 101, and the technical bearing 3 is ensured to be matched with an assembled engine assembly. The distance L between the working surface of the measuring plate 4 and the inner circle step surface 21 in the axial direction of the power turbine long shaft 100 is a fixed value.
Referring to fig. 3, the measuring plate 4 may be fixedly connected to the positioning shaft 2 by a screw or a pin, the positioning shaft 2 may be sleeved on the power turbine long shaft 100, and after the inner circle step surface 21 is tightly attached to the adjustment pad installation step surface 101, a position relationship between the working surface of the measuring plate 4 and the adjustment pad installation step surface 101 in the axial direction of the power turbine long shaft 100, that is, a distance L, may be determined.
Referring to fig. 4, the measuring plate 4 includes a circular shaft portion 41 and a working flat plate portion 42 for connecting with the positioning shaft 2, and the working flat plate portion 42 is provided with a measuring through groove 43 at an end portion for facilitating the use of the depth gauge.
The process bearing 3 is intended to cooperate with an assembled engine component. Thereby providing a support for the power turbine long shaft 100 and, in addition, allowing the positioning shaft 2 to rotate.
Step B, rotating the positioning shaft 2 to enable the measuring plate 4 to be positioned above the honeycomb end face of the guider, measuring and obtaining a distance L2 between the measuring plate 4 and the honeycomb end face of the guider by utilizing a depth gauge to be arranged on the working surface of the measuring plate 4,
then according to the formula: the L1-L2 obtains the dimension L1 of the shim mounting step face 101 to the deflector honeycomb end face.
In order to ensure that the inner circle step surface 21 is tightly attached to the adjusting pad installation step surface 101, the invention further provides a fixing frame 5, the fixing frame 5 is of a cylindrical sleeve structure, the fixing frame 5 can be sleeved on the power turbine long shaft 100 and attached to the top end of the positioning shaft 2, the fixing frame 5 is provided with three fixing beams 51 which are uniformly distributed, and the fixing beams 51 are used for being connected with the end surface of an assembled engine assembly through bolts 52, so that the assembled engine assembly can be used for auxiliary positioning. By adjusting the vertical position of the fixing frame 5, the pressing force on the positioning shaft 2 can be increased or decreased, so that the inner circular step surface 21 and the adjusting pad mounting step surface 101 are tightly attached.
In order to adjust the vertical position of the fixing frame 5 conveniently, the invention also provides an adjusting bolt 6, the adjusting bolt 6 is provided with a positioning pressing block 61 for jointing with the end face of the power turbine long shaft 100 and a bolt 62 rotatably connected with the positioning pressing block 61, when in use, the fixing frame 5 and the bolt 62 can be connected through threads firstly, then the three fixing beams 51 of the fixing frame 5 are connected with the end face of the assembled engine component through bolts 52, then the bolt 62 is rotated until the positioning pressing block 61 is tightly jointed with the end face of the power turbine long shaft 100, and then when the height of the fixing frame 5 needs to be adjusted, only a fixing nut 63 on the bolt 62 needs to be rotated.
According to the method for measuring the size of the small step surface of the slender shaft of the cantilever, the special tool is designed, so that the structural size relation of the cantilever beam which is difficult to directly and accurately measure is converted into the size relation of the fixed characteristic surface, and therefore the measurement precision and the measurement efficiency are greatly improved.
It should be appreciated by those of skill in the art that while the present invention has been described in terms of several embodiments, not every embodiment includes only a single embodiment. The description is given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including technical equivalents which are related to the embodiments and which are combined with each other to illustrate the scope of the present invention.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.
Claims (3)
1. A method for measuring the size of a small step surface of a cantilever slender shaft is characterized in that the method is used for measuring the distance L1 between the installation step surface of an adjusting pad and the honeycomb end surface of a guider after the long shaft of a power turbine is installed in the general assembly process of a turboprop engine, and comprises the following steps:
step A, providing a positioning shaft, wherein the positioning shaft is provided with an inner circle step surface which is used for being attached to the installation step surface of the adjusting pad, the bottom of the positioning shaft is provided with a process bearing which is used for being matched with an assembled engine component, a measuring plate which is fixedly connected with the positioning shaft is arranged above the inner circle step surface,
sleeving the positioning shaft into the long shaft of the power turbine to enable the inner circle step surface to be tightly attached to the mounting step surface of the adjusting pad, ensuring that the process bearing is matched with an assembled engine assembly, enabling the distance L between the working surface of the measuring plate and the inner circle step surface in the axial direction of the long shaft of the power turbine to be a fixed value,
step B, rotating the positioning shaft to enable the measuring plate to be located above the honeycomb end face of the guider, utilizing a depth gauge to be arranged on the working surface of the measuring plate, measuring to obtain a distance L2 between the measuring plate and the honeycomb end face of the guider, and then according to a formula: L1-L2 obtains the dimension L1 of the trim pad mounting step face to the deflector honeycomb end face.
2. The method according to claim 1, wherein in step B, a fixing frame is provided, the fixing frame is of a cylindrical sleeve structure, the fixing frame can be sleeved on the long shaft of the power turbine and is attached to the top end of the positioning shaft, the fixing frame is provided with three fixing beams which are uniformly distributed, the fixing beams are used for being connected with the end face of the assembled engine assembly through bolts, and the pressing force on the positioning shaft can be increased or reduced by adjusting the vertical position of the fixing frame, so that the tight attachment of the inner circular step face and the mounting step face of the adjusting pad is ensured.
3. The method of claim 2, wherein in step B, an adjusting bolt is provided, the adjusting bolt is provided with a positioning pressing block for fitting with the end face of the long shaft of the power turbine, and a bolt rotatably connected with the positioning pressing block, when in use, the fixing frame and the bolt are connected through screw threads, then three fixing beams of the fixing frame and the end face of the assembled engine component are connected through bolts, then the bolt is rotated until the positioning pressing block is tightly fitted with the end face of the long shaft of the power turbine, and then when the height of the fixing frame needs to be adjusted, only a fixing nut on the bolt needs to be rotated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911072874.7A CN110763180B (en) | 2019-11-06 | 2019-11-06 | Method for measuring dimension of small step surface of slender shaft of cantilever |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911072874.7A CN110763180B (en) | 2019-11-06 | 2019-11-06 | Method for measuring dimension of small step surface of slender shaft of cantilever |
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| CN110763180A CN110763180A (en) | 2020-02-07 |
| CN110763180B true CN110763180B (en) | 2021-05-07 |
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| CN201911072874.7A Active CN110763180B (en) | 2019-11-06 | 2019-11-06 | Method for measuring dimension of small step surface of slender shaft of cantilever |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6092411A (en) * | 1997-07-08 | 2000-07-25 | Tokyo Seimitsu Co., Ltd. | Roundness measuring instrument and measuring head calibration method therefor |
| CN202153125U (en) * | 2010-12-28 | 2012-02-29 | 江西昌河航空工业有限公司 | Detection apparatus for tiny step surface |
| CN102494595A (en) * | 2011-12-29 | 2012-06-13 | 南车洛阳机车有限公司 | Coaxiality detection apparatus |
| CN206469809U (en) * | 2016-09-30 | 2017-09-05 | 中车青岛四方机车车辆股份有限公司 | A kind of measurement apparatus for being used to detect air spring rubber heap creep compliance |
| CN107576293A (en) * | 2017-10-11 | 2018-01-12 | 中国航发南方工业有限公司 | Cantilever fulcrum glitch detection frock and detection method |
-
2019
- 2019-11-06 CN CN201911072874.7A patent/CN110763180B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6092411A (en) * | 1997-07-08 | 2000-07-25 | Tokyo Seimitsu Co., Ltd. | Roundness measuring instrument and measuring head calibration method therefor |
| CN202153125U (en) * | 2010-12-28 | 2012-02-29 | 江西昌河航空工业有限公司 | Detection apparatus for tiny step surface |
| CN102494595A (en) * | 2011-12-29 | 2012-06-13 | 南车洛阳机车有限公司 | Coaxiality detection apparatus |
| CN206469809U (en) * | 2016-09-30 | 2017-09-05 | 中车青岛四方机车车辆股份有限公司 | A kind of measurement apparatus for being used to detect air spring rubber heap creep compliance |
| CN107576293A (en) * | 2017-10-11 | 2018-01-12 | 中国航发南方工业有限公司 | Cantilever fulcrum glitch detection frock and detection method |
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| CN110763180A (en) | 2020-02-07 |
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