CN111981949A - Positioning tool, positioning test device and circumferential backlash method thereof - Google Patents
Positioning tool, positioning test device and circumferential backlash method thereof Download PDFInfo
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- CN111981949A CN111981949A CN202010613288.5A CN202010613288A CN111981949A CN 111981949 A CN111981949 A CN 111981949A CN 202010613288 A CN202010613288 A CN 202010613288A CN 111981949 A CN111981949 A CN 111981949A
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- bevel gear
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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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
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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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0002—Arrangements for supporting, fixing or guiding the measuring instrument or the object to be measured
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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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/003—Measuring of motor parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
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- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a positioning tool, a positioning test device and a circumferential backlash method thereof, wherein the positioning tool, the positioning test device and the circumferential backlash method comprise the following steps: the positioning piece is used for supporting the diffuser box and is connected and matched with the compressor rotor to simulate the centering state of the compressor rotor during working; and the pressing piece is coaxially arranged with the positioning piece and is abutted to the positioning piece, and the positioning piece and the compressor rotor are pushed to axially move along the direction of the air inlet casing by applying axial force to the pressing piece until the axial play of a front support bearing in the compressor rotor is eliminated. The positioning tool is designed to be supported against the rear end of the diffuser casing and is connected and matched with the compressor rotor, so that the gas turbine rotor is simulated in the axial direction and is combined with the compressor rotor to form the gas generator rotor, the axial force is applied to the positioning tool, the compressor rotor is tightly pressed to be pushed forwards until the axial clearance of a front support bearing in the compressor rotor is eliminated, the middle driving bevel gear is normally meshed with the middle driven bevel gear, and the accuracy of circumferential backlash measurement is guaranteed.
Description
Technical Field
The invention relates to the field of assembly of gas turbine shaft engines, in particular to a positioning tool. In addition, the invention also relates to a positioning test device comprising the positioning tool and a circumferential backlash method thereof.
Background
As shown in figure 2, a central transmission bevel gear of a certain type of gas turbine shaft engine is an important transmission structure of the engine, and consists of a middle driving bevel gear and a middle driven bevel gear assembly, and the middle driving bevel gear and the middle driven bevel gear assembly are arranged at the front end of a gas compressor rotor to transmit the energy of the gas turbine driving the gas compressor rotor to an internal gear of an accessory casing to drive an accessory device to work. In order to ensure that two gears are normally meshed and form a lubricating oil film when the gears work and prevent tooth tops from being overloaded and broken due to small tooth surface meshing area or tooth roots from being worn due to large tooth surface meshing area, the circumferential clearance measurement of the gears must be ensured to be qualified and stable during assembly. After the measured tooth clearance of the central transmission bevel gear is qualified in the assembly process of the components, the assembled complete machine needs to simulate the high-speed running of the gas turbine rotor in a working state again to drive the gas compressor rotor to move forward, and whether the circumferential clearance measurement of the central transmission bevel gear is qualified at the moment is checked, so that the method is one of the keys for ensuring the normal operation of an engine. The middle driving bevel gear is fixed on the compressor rotor, the middle driven bevel gear is fixed on the front-section casing, and because the front support bearing of the compressor rotor is a double-half inner ring angular contact ball bearing, an axial clearance exists between an inner ring and an outer ring, normal meshing of the central driving bevel gear cannot be realized, and a large measurement error exists when circumferential clearance measurement is carried out.
Disclosure of Invention
The invention provides a positioning tool, a positioning test device and a circumferential backlash method thereof, which aim to solve the technical problem that the adjustment of the circumferential backlash of a bevel gear is difficult to carry out in the working state of an engine.
The technical scheme adopted by the invention is as follows:
a positioning tool is used for simulating the circumferential side clearance of a central transmission bevel gear when a gas turbine rotor is used for measuring the working state of an engine, the gas turbine rotor comprises a diffuser casing, a compressor rotor and an air inlet casing, the compressor rotor comprises a front supporting bearing, and the positioning tool comprises: the positioning piece is used for supporting the diffuser box and is connected and matched with the compressor rotor to simulate the centering state of the compressor rotor during working; the pressing piece is coaxially arranged with the positioning piece and is abutted to the positioning piece, the positioning piece and the gas compressor rotor are pushed to move axially along the air inlet casing by applying axial force to the pressing piece until the axial clearance of a front support bearing in the gas compressor rotor is eliminated, and then the simulated assembly of the gas turbine rotor is realized, so that the circumferential backlash of the central transmission bevel gear in the working state of the engine is conveniently measured.
The positioning piece comprises a support frame which is used for supporting the outer wall surface at the rear end of the diffuser case, the support frame is fixedly connected with the mounting edge of the diffuser case through a first connecting piece, a through hole which is coaxially arranged with the compressor rotor is formed in the support frame, and a positioning boss which enters the compressor rotor through the through hole and is coaxially connected with the compressor rotor is guided by the through hole, the positioning boss is fixedly mounted on the support frame through a second connecting piece, a through groove which is used for enabling a central pull rod in the compressor rotor to penetrate through the through groove, a locking piece which is used for locking and fixing with the central pull rod is arranged at one end, far away from the compressor rotor, of the positioning boss, and the positioning boss is tightly pressed onto the compressor rotor through the locking piece and the central pull rod, so that the centering state of the compressor rotor.
Furthermore, the positioning boss is meshed, connected and matched with the end teeth of the centrifugal impeller of the compressor rotor.
Furthermore, the first connecting piece adopts at least one of plug connection, clamping connection, bolt connection or welding; the second connecting piece adopts at least one of plug connection, clamping connection, bolt connection or welding; the locking piece adopts a nut matched with the external thread of the central pull rod.
Further, the pressing member includes: the fixing frame is fixedly arranged on the supporting frame through a third connecting piece, and the fixing frame is provided with a through hole for the penetration of the pressing sleeve; one end of the pressing sleeve, which is far away from the positioning boss, is provided with a handle which is used for applying force to press the pressing sleeve into the through hole and prop against the positioning boss.
Furthermore, the outer surface of the pressing sleeve is in threaded fit with the inner wall surface of the through hole; the third connecting piece adopts at least one of plug-in connection, clamping connection, bolt connection or welding.
According to another aspect of the present invention, there is also provided a positioning test apparatus, including the above positioning tool, the positioning test apparatus further includes: the air compressor comprises a middle driving bevel gear installed in an air compressor rotor, a driven bevel gear installed in an air inlet casing, and a backlash measuring tool which is used for penetrating through an air inlet casing installation hole and is matched with the middle driven bevel gear.
Further, the backlash measuring tool comprises a measuring assembly and a rotating assembly; the rotating assembly includes: the indicating plate is arranged on the mandrel, close to one end of the rotating part and extends along the radial direction of the mandrel, the rotating part and the indicating plate are both positioned outside the mounting hole of the air inlet casing, a reticle is arranged on the indicating plate, and the distance from the reticle to the central line of the mandrel is the reference circle radius of the middle driven bevel gear; the measuring component comprises a dial indicator and an indicator frame, the indicator frame is arranged at the input end of the mounting hole of the gas casing, and the pointer of the dial indicator is in contact with the scribed line.
According to another aspect of the present invention, there is also provided a method of measuring the circumferential backlash of a central drive bevel gear, using the above positioning test apparatus, comprising the steps of: installing and fixing an air inlet casing on an assembly vehicle along the vertical direction, installing a compressor rotor with a front supporting bearing on the air inlet casing from the rear end of the air inlet casing, installing a diffuser casing on the compressor rotor from the rear end of the compressor rotor, installing a positioning tool on the diffuser casing from the rear end of the diffuser casing, applying axial force to the positioning tool and pushing the positioning tool and the compressor rotor to move along the axial direction of the air inlet casing until the axial clearance of a front supporting bearing in the compressor rotor is eliminated, and assembling to form the engine; rotating the engine by 180 degrees to enable the front support bearing to be vertically upward, installing the middle driving bevel gear in a rotor of the gas compressor, installing the middle driven bevel gear in the gas inlet casing, and ensuring that the middle driving bevel gear and the middle driven bevel gear are in a meshed state; and rotating the engine to a horizontal state, penetrating a backlash measuring tool through an air inlet casing mounting hole and matching with the middle driven bevel gear, rotating the backlash measuring tool, and measuring the rotating angle of the backlash measuring tool to obtain the circumferential backlash of the bevel gear.
Further, the installation step of the positioning tool comprises the following steps: the supporting frame is arranged on the mounting edge of the diffuser casing, the positioning boss penetrates through the through hole of the supporting frame and is arranged on a centrifugal blade of the compressor rotor, and the locking piece is in locking connection with a central pull rod in the compressor rotor so as to simulate the centering state of the compressor rotor during working; the fixing frame is installed and fixed on the supporting frame, and the pressing sleeve penetrates through the through hole of the fixing frame and is axially abutted to the positioning boss.
The invention has the following beneficial effects:
the positioning tool is used for simulating a gas turbine rotor to measure the circumferential backlash of a central transmission bevel gear in the working state of an engine, and comprises a positioning piece and a pressing piece, wherein the positioning piece and the pressing piece are used for analyzing the structural characteristics of the whole machine after the whole machine is assembled to a diffuser box, the positioning tool is designed to be supported against the rear end of the diffuser box and is in connection fit with a compressor rotor, so that the gas turbine rotor is simulated in the axial direction and is combined with the compressor rotor to form a gas generator rotor, the axial force is applied to the positioning tool, the compressor rotor is pressed forwards until the axial backlash of a front support bearing in the compressor rotor is eliminated, and a middle driving bevel gear is normally meshed with a middle driven bevel gear, so that the accuracy of circumferential backlash measurement is ensured, and the defect that the circumferential backlash cannot be adjusted in the working state of the engine is overcome. In addition, the positioning tool can measure a plurality of positions, the parts of the positioning tool are quite convenient to disassemble and assemble, if the circumferential side clearance is unqualified, the adjustment of the circumferential side clearance can be adjusted in time by increasing or decreasing the adjusting pads of the driving gear and the driven gear, so that the adjustment of the circumferential side clearance is simple and convenient, the engine can flexibly rotate, multi-point measurement can be carried out, and the accuracy and the operability are guaranteed.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a positioning tool in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a central drive bevel gear of the preferred embodiment of the present invention;
FIG. 3 is a top view of the support bracket of the preferred embodiment of the present invention;
FIG. 4 is a schematic view of a positioning boss of the preferred embodiment of the present invention;
FIG. 5 is a top view of a positioning boss of the preferred embodiment of the present invention;
FIG. 6 is a schematic view of a mount of the preferred embodiment of the present invention;
FIG. 7 is a top view of the mount of the preferred embodiment of the present invention;
FIG. 8 is a schematic view of a press sleeve of the preferred embodiment of the present invention;
FIG. 9 is a schematic view of a backlash measuring device in accordance with a preferred embodiment of the present invention; and
fig. 10 is a schematic view of a rotating assembly of the backlash measuring tool in accordance with the preferred embodiment of the present invention.
The reference numbers illustrate:
1. a positioning member; 2. a compression member; 3. a diffuser case; 4. a compressor rotor; 5. an air inlet casing; 6. a middle drive bevel gear; 7. a middle driven bevel gear; 8. a backlash measuring tool;
11. a support frame; 12. a first connecting member; 13. positioning the boss; 14. a second connecting member; 15. a locking member;
21. pressing the sleeve; 22. a fixed mount; 23. a third connecting member; 24. a handle;
41. a front support bearing; 42. a central pull rod;
81. a measurement assembly; 811. a dial indicator; 812. a watch frame; 82. a rotating assembly; 821. a mandrel; 822. a rotating member; 823. an indicator panel; 824. and (6) scribing.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
FIG. 1 is a schematic view of a positioning tool in accordance with a preferred embodiment of the present invention; FIG. 2 is a schematic view of a central drive bevel gear of the preferred embodiment of the present invention; FIG. 3 is a top view of the support bracket of the preferred embodiment of the present invention; FIG. 4 is a schematic view of a positioning boss of the preferred embodiment of the present invention; FIG. 5 is a top view of a positioning boss of the preferred embodiment of the present invention; FIG. 6 is a schematic view of a mount of the preferred embodiment of the present invention; FIG. 7 is a top view of the mount of the preferred embodiment of the present invention; FIG. 8 is a schematic view of a press sleeve of the preferred embodiment of the present invention; FIG. 9 is a schematic view of a backlash measuring device in accordance with a preferred embodiment of the present invention; fig. 10 is a schematic view of a rotating assembly of the backlash measuring tool in accordance with the preferred embodiment of the present invention.
As shown in fig. 1 and 2, the positioning tool of the present embodiment is used for simulating a gas turbine rotor to measure a circumferential backlash of a central transmission bevel gear in an engine operating state, the gas turbine rotor includes a diffuser casing 3, a compressor rotor 4 and an air inlet casing 5, the compressor rotor 4 includes a front support bearing 41, and includes: the positioning piece 1 is used for supporting on the diffuser casing 3 and is connected and matched with the compressor rotor 4 to simulate the centering state of the compressor rotor 4 during working; the pressing piece 2 is coaxially arranged with the positioning piece 1 and is abutted to the positioning piece 1, axial force is applied to the pressing piece 2 and the positioning piece 1 and the gas compressor rotor 4 are pushed to move along the axial direction of the gas inlet casing 5 until the axial clearance of a front support bearing 41 in the gas compressor rotor 4 is eliminated, and then simulated assembly of the gas turbine rotor is achieved, so that the circumferential backlash of a central transmission bevel gear in the working state of an engine can be conveniently measured. The positioning tool is used for simulating a gas turbine rotor to measure the circumferential backlash of a central transmission bevel gear in the working state of an engine, and comprises a positioning piece 1 and a pressing piece 2, the positioning tool is designed to be supported against the rear end of a diffuser box 3 and connected and matched with a compressor rotor 4 by analyzing the structural characteristics of the whole machine after the whole machine is assembled to the diffuser box 3, so that the gas turbine rotor is simulated in the axial direction and combined with the compressor rotor 4 to form a gas generator rotor, the compressor rotor 4 is pressed forward by applying axial force to the positioning tool until the axial clearance of a front support bearing 41 in the compressor rotor 4 is eliminated, the middle driving bevel gear is normally meshed with the middle driven bevel gear 7, the accuracy of circumferential backlash measurement is ensured, and the defect that the circumferential backlash cannot be adjusted in the working state of the engine is overcome. In addition, the positioning tool can measure a plurality of positions, the parts of the positioning tool are quite convenient to disassemble and assemble, if the circumferential backlash is unqualified, the adjustment of the circumferential backlash can be adjusted in time by increasing or decreasing the adjusting pads of the middle driving bevel gear 6 and the middle driven bevel gear 7, so that the adjustment of the circumferential backlash is simple and convenient, the composed engine can flexibly rotate, multi-point measurement can be carried out, and the accuracy and the operability are ensured.
The gear circumferential backlash of the present invention refers to the maximum value of the pitch arc length that one gear, i.e., the middle drive bevel gear 6, and the other gear, i.e., the middle driven bevel gear 7, can rotate through, among a pair of gears that mesh with each other.
As shown in figure 2, in the whole assembly process of the engine, the air inlet casing 5, the compressor rotor 4 and the diffuser casing 3 are assembled on the engine, the compressor rotor 4 adopts a 1-0-1 supporting structure, the front support is a front supporting bearing 41, the rear supporting casing is not installed at the moment, the rear end of the compressor rotor 4 is suspended, if the rear supporting casing is installed, the compressor rotor 4 cannot be pushed forwards,
as shown in fig. 1, 3, 4 and 5, in this embodiment, the positioning member 1 includes a support frame 11 for supporting on an outer wall surface of the rear end of the diffuser casing 3, the support frame 11 is connected and fixed with a mounting edge of the diffuser casing 3 through a first connecting member 12, the support frame 11 is provided with a through hole for being coaxially arranged with the compressor rotor 4, and a positioning boss 13 guided into the compressor rotor 4 through the through hole and coaxially connected with the compressor rotor 4, the positioning boss 13 is mounted and fixed on the support frame 11 through a second connecting member 14, the positioning boss 13 is provided with a through groove for allowing a central pull rod 42 in the compressor rotor 4 to pass through, one end of the positioning boss 13 away from the compressor rotor 4 is provided with a locking member 15 for being locked and fixed with the central pull rod 42, and the locking member 15 is locked and connected with the central pull rod 42 to press the positioning boss 13 onto the compressor rotor 4, thereby simulating the centering state of the compressor rotor 4 during operation. The positioning member 1 comprises a support frame 11, a first connecting member 12, a positioning boss 13, a second connecting member 14 and a locking member 15, wherein the support frame 11 is placed on the mounting edge at the rear end of the diffuser case 3 to be supported and connected on the diffuser case 3. The support frame 11 comprises a horizontal support plate, a through hole which is coaxially arranged with the compressor rotor 4 is formed in the center of the horizontal support plate, a first mounting end and a second mounting end, extending along the vertical direction, of a first free end and a second free end of the support plate are respectively arranged, and mounting bosses are respectively arranged on the first mounting end and the second mounting end. The support frame 11 is placed on the mounting edge of the diffuser casing 3, and the mounting boss of the support frame 11 aligns the mounting edge of the diffuser casing 3 and is connected and fixed through the second connecting piece 14. And then the positioning boss 13 penetrates through the through hole under the guiding action of the through hole and is coaxially connected with the compressor rotor 4. The base body structure of the positioning boss 13 is designed according to the diffuser casing 3 and the compressor rotor 4, and is provided with a mounting edge, and after the positioning boss 13 enters the diffuser casing 3 and is coaxially connected with the compressor rotor 4, the second connecting piece 14 is fixedly connected with the supporting frame 11 through the mounting edge, so that the positioning boss 13 is mounted and positioned. One end of the positioning boss 13 is abutted against a centrifugal impeller of the compressor rotor 4, a locking member 15 is arranged at the other end of the positioning boss 13, and the locking member 15 is locked and connected with the central pull rod 42 so as to simulate the gas turbine rotor in the axial direction and combine with the compressor rotor 4 to form the gas generator rotor
In this embodiment, the positioning boss 13 is engaged with and engaged with the end teeth of the centrifugal impeller of the compressor rotor 4. The positioning boss 13 is matched with the centrifugal impeller of the compressor rotor 4 through end teeth, and the accuracy of the centering of the compressor rotor can be improved due to the fact that the end teeth are high in machining precision. The support surface of the mounting boss of the support frame 11 is used as a reference, the processing precision is high, the support frame is well matched with the inner end surface of the diffuser casing 3, the support frame 11 is precisely connected with the positioning boss 13 through the second connecting piece 14, and the positioning boss 13 is matched with the end teeth of the compressor rotor 4, so that the circumferential centering accuracy of the compressor rotor 4 is effectively ensured.
As shown in fig. 1, 3, 4 and 5, in the present embodiment, the first connecting member 12 is at least one of a plug connection, a snap connection, a bolt connection or a welding connection. The second connecting member 14 is at least one of a plug connection, a snap connection, a bolt connection, or a welding connection. The locking member 15 is a nut that is externally threaded on the central rod 42. Preferably, the second connecting element 14 is a pin, and the pin is knocked into the support frame 11 to be in interference fit with the pre-installation position of the positioning boss 13. Placing the support frame 11 on the mounting edge of the diffuser case 3, aligning the mounting boss of the support frame 11 with the inner edge of the diffuser case 3, and symmetrically screwing the first connecting piece 12, wherein the first connecting piece 12 adopts a hexagon head bolt, a washer and a hexagon nut (piece 3) with a key; the positioning boss 13 is aligned with the pin from top to bottom, the end teeth are arranged on the centrifugal impeller of the compressor rotor 4 in a matching mode, and the axial size and the end teeth processing of the positioning boss 13 are the same as those of the gas turbine rotor. The nut is screwed by using a torque wrench and a sleeve head, and the nut is screwed by referring to the assembly process of the gas turbine rotor, a central pull rod 42 in the middle of the gas compressor rotor 4 is pulled backwards by using hydraulic equipment to screw the nut to the bottom, so that the gas turbine rotor is simulated in the axial direction and is combined with the gas compressor rotor 4 to form the gas generator rotor, and the positioning boss 13 is connected with the gas compressor rotor 4 into a whole by nut compression.
As shown in fig. 1, 6, 7, and 8, in the present embodiment, the pressing member 2 includes: locate setting element 1 rear end and along the pressure cover 21 of axial top support location boss 13 to and be used for supporting and radial positioning pressure cover 21 and guarantee to press the cover 21 and the coaxial top of location boss 13 to support the mount 22 of butt joint, mount 22 passes through third connecting piece 23 and installs and fix on support frame 11, is equipped with the through-hole that is used for pressing cover 21 to run through on the mount 22. One end of the pressing sleeve 21 far away from the positioning boss 13 is provided with a handle 24 for applying force to press the pressing sleeve 21 into the through hole and abut against the positioning boss 13. The pressing part 2 comprises a pressing sleeve 21, a fixing frame 22, a third connecting part 23 and a handle 24, the fixing frame 22 is fixedly installed on the supporting frame 11 through the third connecting part 23, an internal thread is arranged in a through hole in the fixing frame 22, an external thread matched with the internal thread in the through hole is arranged on the outer surface of the pressing sleeve 21, the pressing sleeve 21 is screwed into the through hole through the rotating handle 24, the bottom end of the pressing sleeve 21 is abutted to the positioning boss 13, the pressing sleeve 21 is pressed downwards to the positioning boss 13 through a torque wrench and a sleeve head according to a specified torque, the compressor rotor 4 is driven to move forwards, and the axial play of the front supporting bearing 41 is eliminated.
In this embodiment, the outer surface of the pressing sleeve 21 is screw-fitted to the inner wall surface of the through hole. The third connecting member 23 is at least one of a plug connection, a snap connection, a bolt connection, or a welding connection. The third connecting member 23 is a hexagon socket cap screw, and the fixing frame 22 is fixed on the supporting frame 11 by the hexagon socket cap screw.
As shown in fig. 1, fig. 2 and fig. 9, according to another aspect of the present invention, there is further provided a positioning tool, and the positioning test apparatus further includes: the gas compressor comprises a middle driving bevel gear 6 arranged in a gas compressor rotor 4, a driven bevel gear 7 arranged in a gas inlet casing 5, and a tooth clearance measuring tool 8 which is used for penetrating through a mounting hole of the gas inlet casing 5 and is matched with the middle driven bevel gear 7. The positioning test device of the invention eliminates the axial clearance of the front support bearing 41 by simulating the forward movement of the compressor rotor 4 when the engine works, ensures the centering of the compressor rotor 4, retests the circumferential clearance measurement of the central transmission bevel gear, and greatly simplifies the assembly structure of the engine. Meanwhile, the operation flexibility and the measurement accuracy are improved.
As shown in fig. 9 and 10, in the present embodiment, the backlash measuring device 8 includes a measuring unit 81 and a rotating unit 82. The rotating assembly 82 includes: the air inlet machine box comprises a spindle 821, a rotating piece 822 and an indicator plate 823, wherein the spindle 821 is used for penetrating through a mounting hole of the air inlet machine box 5 and is matched with a spline in a middle driven bevel gear 7, the rotating piece 822 is arranged at the end portion, away from one end of the middle driven bevel gear 7, of the spindle 821 and is used for driving the spindle 821 to rotate, the indicator plate 823 is arranged on one end, close to one end of the rotating piece 822, of the spindle 821 and extends in the radial direction of the spindle 821, the rotating piece 822 and the indicator plate 823 are located outside the mounting hole of the air inlet machine box 5, a score line 824 is arranged on the indicator plate 823. The measurement assembly 81 includes a dial indicator 811 and a gauge housing 812, the gauge housing 812 being mounted at the inlet end of the mounting hole of the casing, the pointer of the dial indicator 811 being in contact with the score line 824. During the measurement process of the backlash measuring tool 8, the pointer of the dial indicator 811 is in contact with the scale line 824, the scale line 824 is positioned at the reference circle radius of the middle driven bevel gear 7, the distance from the center line of the spindle 821 to the scale line 824 is the reference circle radius of the middle driven bevel gear 7, when the rotating member 822 is rotated, the dial indicator 811 rotates, and the reading displayed by the dial indicator 811 is the maximum value of the pitch arc length which the middle driven bevel gear 7 can rotate, namely the value for measuring the circumferential backlash of the bevel gear. The rotating member 822 may be a nut, and the spindle 821 may be provided with a thread engaged with the nut. The rotating assembly 82 further includes a resilient bushing 825 for fitting over the spindle 821 to protect the spindle 821. The elastomeric bushing 825 protects the spindle 821, slows torsional deformation of the spindle 821, and is environmentally sealed, reduces the risk of corrosion, and extends the useful life of the rotating assembly 82.
According to another aspect of the present invention, there is also provided a method of measuring the circumferential backlash of a central drive bevel gear, using the above positioning test apparatus, comprising the steps of: the method comprises the steps of installing and fixing an air inlet casing 5 on an assembly vehicle along the vertical direction, installing a compressor rotor 4 with a front supporting bearing 41 on the air inlet casing 5 from the rear end of the air inlet casing 5, installing a diffuser casing 3 on the compressor rotor 4 from the rear end of the compressor rotor 4, installing a positioning tool on the diffuser casing 3 from the rear end of the diffuser casing 3, applying axial force to the positioning tool and pushing the positioning tool and the compressor rotor 4 to move along the axial direction of the air inlet casing 5 until the axial clearance of the front supporting bearing 41 in the compressor rotor 4 is eliminated, and assembling to form the engine. The engine is rotated by 180 degrees to enable the front supporting bearing 41 to be vertically upward, the middle driving bevel gear 6 is installed in the compressor rotor 4, the middle driven bevel gear 7 is installed in the air inlet casing 5, and the middle driving bevel gear 6 and the middle driven bevel gear 7 are ensured to be in a meshed state. Rotating the engine to a horizontal state, penetrating a backlash measuring tool 8 through an installation hole of the air inlet casing 5 and matching with a middle driven bevel gear 7, rotating the backlash measuring tool 8, and measuring the rotating angle of the backlash measuring tool 8 to obtain the bevel gear circumferential backlash. The method for measuring the circumferential backlash of the central transmission bevel gear adopts the positioning test device for measurement, has simple operation process and high measurement accuracy, can carry out multi-point measurement, and ensures the accuracy and the operability. When the engine rotates to be horizontal, the rotating assembly 82 enters from the transmission hole of the air inlet casing 5 and is inserted into the internal spline of the middle driven bevel gear 7, the backlash measuring tool 8 is arranged on an external fixing piece to fix the backlash measuring tool 8 and the middle driven bevel gear 7, then the pointer of the dial indicator 811 arranged on the indicator frame 812 is pressed on the long section part of the indicator plate 823, the rotating piece 822 is screwed to drive the middle driven bevel gear 7 to be matched with the middle driving bevel gear 6, and the maximum rotating angle is the backlash of the middle driving middle driven bevel gear 7.
In this embodiment, the installation step of location frock includes: the support frame 11 is arranged on the mounting edge of the diffuser casing 3, the positioning boss 13 penetrates through the through hole of the support frame 11 and is arranged on the centrifugal blade of the compressor rotor 4, and the locking piece 15 is in locking connection with the central pull rod 42 in the compressor rotor 4 so as to simulate the centering state of the compressor rotor 4 during working. The fixing frame 22 is fixed on the support frame 11, and the pressing sleeve 21 penetrates through the through hole of the fixing frame 22 and is abutted against the positioning boss 13 along the axial direction. Firstly, a support frame 11 is installed and fixed on a diffusion casing 3, so that the support frame 11, the diffusion casing 3 and a gas inlet casing 5 of a gas compressor rotor 4 are connected into a whole; then the positioning boss 13 is arranged on a centrifugal blade of the compressor rotor 4, and the locking piece 15 is connected with a central pull rod 42 of the compressor rotor 4 in a locking way, so that the positioning piece 1 and the compressor rotor 4 are connected into a whole; and then the fixed frame 22 is installed and fixed on the support frame 11, the handle is rotated to press the pressing sleeve 21 downwards to be transmitted to the positioning boss 13, and then the positioning boss 13 and the compressor rotor 4 are driven to move forwards until the axial clearance of the front supporting bearing 41 is eliminated.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A positioning tool is used for simulating a gas turbine rotor to measure the circumferential side clearance of a central transmission bevel gear when an engine works, the gas turbine rotor comprises a diffuser casing (3), a compressor rotor (4) and an air inlet casing (5), the compressor rotor (4) comprises a front support bearing (41), and the positioning tool is characterized in that,
the method comprises the following steps:
the positioning piece (1) is used for being supported on the diffuser casing (3) and is connected and matched with the compressor rotor (4) to simulate the centering state of the compressor rotor (4) during working;
the gas turbine rotor simulation assembly device is characterized in that a pressing piece (2) used for being coaxially arranged with the positioning piece (1) and abutting against the positioning piece (1) is used for exerting axial force on the pressing piece (2) and pushing the positioning piece (1) and the gas compressor rotor (4) to move along the axial direction of the gas inlet casing (5) until the axial clearance of a front supporting bearing (41) in the gas compressor rotor (4) is eliminated, so that the simulation assembly of the gas turbine rotor is realized, and the circumferential side clearance of a central transmission bevel gear in the working state of an engine is conveniently measured.
2. The positioning tool of claim 1,
the positioning piece (1) comprises a support frame (11) which is used for supporting on the outer wall surface of the rear end of the diffuser box (3), the support frame (11) is fixedly connected with the mounting edge of the diffuser box (3) through a first connecting piece (12),
the supporting frame (11) is provided with a through hole which is coaxially arranged with the compressor rotor (4) and a positioning boss (13) which is guided into the compressor rotor (4) through the through hole and is coaxially connected with the compressor rotor (4),
the positioning boss (13) is fixedly arranged on the support frame (11) through a second connecting piece (14),
a through groove for enabling a central pull rod (42) in the compressor rotor (4) to penetrate through is arranged on the positioning boss (13),
keep away from on location boss (13) one end of compressor rotor (4) be equipped with be used for with retaining member (15) that central pull rod (42) locking is fixed, through retaining member (15) with central pull rod (42) locking connection in order to with location boss (13) compress tightly to compressor rotor (4) on, thereby simulate the centering state of compressor rotor (4) during operation.
3. The positioning tool of claim 2,
the positioning boss (13) is meshed, connected and matched with the end teeth of the centrifugal impeller of the compressor rotor (4).
4. The positioning tool of claim 2,
the first connecting piece (12) adopts at least one of plug connection, clamping connection, bolt connection or welding;
the second connecting piece (14) adopts at least one of plug connection, clamping connection, bolt connection or welding;
the locking piece (15) adopts a nut matched with the external thread of the central pull rod (42).
5. The positioning tool of claim 2,
the pressing member (2) comprises: a pressing sleeve (21) which is arranged at the rear end of the positioning piece (1) and axially abuts against the positioning boss (13), and a fixing frame (22) which is used for supporting and radially positioning the pressing sleeve (21) and ensuring that the pressing sleeve (21) and the positioning boss (13) coaxially abut against and are butted with each other,
the fixing frame (22) is fixedly arranged on the support frame (11) through a third connecting piece (23), and a through hole for the pressing sleeve (21) to penetrate through is formed in the fixing frame (22);
and one end of the pressing sleeve (21) far away from the positioning boss (13) is provided with a handle (24) which is used for applying force to press the pressing sleeve (21) into the through hole and abut against the positioning boss (13).
6. The positioning tool of claim 5,
the outer surface of the pressing sleeve (21) is in threaded fit with the inner wall surface of the through hole;
the third connecting piece (23) adopts at least one of plug connection, clamping connection, bolt connection or welding.
7. A positioning test device, which is characterized by comprising the positioning tool of any one of claims 1 to 6,
the positioning test device further comprises: the air compressor comprises a middle driving bevel gear (6) arranged in an air compressor rotor (4), a driven bevel gear (7) arranged in an air inlet casing (5), and a backlash measuring tool (8) which is used for penetrating through a mounting hole of the air inlet casing (5) and is matched with the middle driven bevel gear (7).
8. The positioning test apparatus of claim 7,
the backlash measuring tool (8) comprises a measuring component (81) and a rotating component (82);
the rotating assembly (82) comprises: a spindle (821) which is used for passing through a mounting hole of the air inlet casing (5) and is matched with the spline in the middle driven bevel gear (7), a rotating piece (822) which is arranged at the end part of the spindle (821) far away from one end of the middle driven bevel gear (7) and is used for driving the spindle (821) to rotate, and an indicating plate (823) which is arranged on the spindle (821) near one end of the rotating piece (822) and extends along the radial direction of the spindle (821),
the rotating piece (822) and the indicating plate (823) are located outside the mounting hole of the air inlet casing (5), a scribed line (824) is arranged on the indicating plate (823), and the distance from the scribed line (824) to the center line of the spindle (821) is the reference circle radius of the middle driven bevel gear (7);
the measuring assembly (81) comprises a dial indicator (811) and an indicator frame (812), the indicator frame (812) is installed at the input end of the gas casing installation hole, and the pointer of the dial indicator (811) is in contact with the scale line (824).
9. A method of measuring the circumferential backlash of a central drive bevel gear, using the positioning test apparatus of claim 7 or 8, comprising the steps of:
installing and fixing an air inlet casing (5) on an assembly vehicle along the vertical direction, installing a compressor rotor (4) with a front supporting bearing (41) on the air inlet casing (5) from the rear end of the air inlet casing (5), installing a diffuser casing (3) on the compressor rotor (4) from the rear end of the compressor rotor (4), installing a positioning tool on the diffuser casing (3) from the rear end of the diffuser casing (3), applying axial force to the positioning tool and pushing the positioning tool and the compressor rotor (4) to move along the axial direction of the air inlet casing (5) until the axial clearance of the front supporting bearing (41) in the compressor rotor (4) is eliminated, and assembling to form an engine;
rotating the engine by 180 degrees to enable the front support bearing (41) to be vertically upward, installing the middle driving bevel gear (6) in the compressor rotor (4), installing the middle driven bevel gear (7) in the air inlet casing (5), and ensuring that the middle driving bevel gear (6) and the middle driven bevel gear (7) are in a meshed state;
rotating the engine to a horizontal state, penetrating a backlash measuring tool (8) through an installation hole of the air inlet casing (5) and matching with a middle driven bevel gear (7), rotating the backlash measuring tool (8), and measuring the rotating angle of the backlash measuring tool (8) to obtain the circumferential backlash of the bevel gear.
10. The method of measuring circumferential backlash of a central drive bevel gear according to claim 9,
the installation step of the positioning tool comprises the following steps:
the method comprises the following steps that a support frame (11) is arranged on an installation edge of a diffuser casing (3), a positioning boss (13) penetrates through a through hole of the support frame (11) and is arranged on a centrifugal blade of a compressor rotor (4), and a locking piece (15) is in locking connection with a central pull rod (42) in the compressor rotor (4) so as to simulate the centering state of the compressor rotor (4) during working;
and a fixing frame (22) is fixedly arranged on the support frame (11), and a pressing sleeve (21) penetrates through a through hole of the fixing frame (22) and is axially propped against the positioning boss (13).
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| CN202010613288.5A CN111981949B (en) | 2020-06-30 | 2020-06-30 | Positioning tool, positioning test device and circumferential backlash method thereof |
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| CN202010613288.5A CN111981949B (en) | 2020-06-30 | 2020-06-30 | Positioning tool, positioning test device and circumferential backlash method thereof |
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| CN113532237A (en) * | 2021-05-27 | 2021-10-22 | 中国航发南方工业有限公司 | Measuring device and method for measuring axial distance of compressor rotor assembly |
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| CN113858105A (en) * | 2021-09-24 | 2021-12-31 | 中国航发南方工业有限公司 | Aeroengine guiding assembly mechanism and assembly method |
| CN113858105B (en) * | 2021-09-24 | 2023-10-03 | 中国航发南方工业有限公司 | Aeroengine guiding assembly mechanism and assembly method |
| CN114001626A (en) * | 2021-11-10 | 2022-02-01 | 中国航发南方工业有限公司 | Device and method for measuring axial activity of rotor in engine blind cavity |
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