CN113074636B - Graphite seal test axle is beated and is adjusted measuring device - Google Patents
Graphite seal test axle is beated and is adjusted measuring device Download PDFInfo
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- CN113074636B CN113074636B CN202110334768.2A CN202110334768A CN113074636B CN 113074636 B CN113074636 B CN 113074636B CN 202110334768 A CN202110334768 A CN 202110334768A CN 113074636 B CN113074636 B CN 113074636B
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
Abstract
The invention discloses a graphite seal test shaft run-out adjusting and measuring device, which relates to the technical field of graphite seal ring tightness tests of aero-engines and comprises an adjusting box body, a graphite seal test device, a rotor run-out adjusting device and a measuring device; the graphite sealing experimental device comprises a main shaft, a supporting bearing, a support and a graphite sealing ring test piece, wherein the main shaft is rotatably arranged on the adjusting box body through the supporting bearing; the first end of the main shaft is used for connecting a driving system, the graphite sealing ring test piece is arranged at the upper part of the support, and the second end of the main shaft penetrates through the graphite sealing ring test piece; the rotor runout adjusting device comprises a bearing box, an adjusting bearing is assembled in the bearing box, a main shaft is assembled on an inner ring of the adjusting bearing, and the bearing box is connected with a radial adjusting device; the measuring device is arranged close to the main shaft jumping measuring point and used for measuring the jumping of the main shaft jumping measuring point. The invention meets the practical requirement of adjusting and monitoring the main shaft bounce in the tightness experiment of the graphite sealing ring.
Description
Technical Field
The invention relates to the technical field of a graphite sealing ring tightness test of an aeroengine, in particular to a shaft run-out adjusting and measuring device for a graphite sealing test.
Background
The sealing device has critical influence on a plurality of important indexes of the aircraft engine, namely the gas flow, the pressure ratio, the thrust-weight ratio and the oil consumption rate of the engine from the micro level, the maintenance cost and the maintenance difficulty and the service life of the whole engine from the macro level. Particularly, as a sealing device for a spindle seal of an aircraft engine, the sealing device needs to have the capability of being conveniently assembled and stably operated in a narrow space, and has the characteristics of small volume, low density, high safety and the like. The graphite material has the advantages of low density, high strength, high thermal conductivity, low expansibility, excellent self-lubricity, good running-in performance with various materials and the like, and can meet most requirements of contact type dynamic sealing of an aircraft engine under severe working conditions of high temperature, high pressure, high speed, high load and the like. Graphite sealing materials are therefore widely used in dynamic seals for aircraft engines, in particular in circumferential seals.
When the main shaft, the bearing and the graphite sealing ring are in ideal states, the pressure applied to the surface of the graphite sealing ring through the sealing track during the rotation of the main shaft is uniform, and the main shaft is also a balanced rotating body. However, in practice, the spindle is made of a non-uniform material, the spindle, the bearing and the graphite sealing ring are not symmetrical ideal structures due to a manufacturing process, an assembly error exists between the spindle and the bearing, an assembly error exists between the sealing runway of the spindle and the graphite sealing ring, and the like, so that the spindle is not in a balanced and stable state of rotating around the axis in the rotating process. Such unbalanced eccentric rotation of the main shaft causes irregular contact with the graphite seal ring as a stator by centrifugal force, thereby generating vibration (and shaft runout). The mechanical influence of shaft runout on the graphite sealing ring is the additional impact load which is between the magnitude difference of the main shaft and the graphite sealing ring in the aeroengine in terms of mass, and the influence of the additional impact load cannot be ignored. And sliding friction exists between the graphite ring and the sealing runway in the graphite sealing device, and the sliding friction is acted by the structure, impact and thermal load. The sliding friction is not uniform any more and presents periodic characteristics due to periodic shaft runout, so that the structural damage of the graphite sealing ring is further caused, the main failure modes are wear and brittle fracture friction wear, and the contact characteristic has great influence on the performance and the service life of the sealing device.
Just as shaft run-out is detrimental to the proper functioning of graphite seal rings, it is necessary to quantitatively assess this in experiments. The method is characterized in that different shaft end jumping working conditions are manufactured through some adjusting measures, and performance changes of the graphite ring are tested and detected under the working conditions.
Therefore, it is desirable to provide a new device for adjusting and measuring shaft run-out in graphite sealing test to solve the above problems in the prior art.
Disclosure of Invention
The invention aims to provide a shaft runout adjusting and measuring device for a graphite sealing test, which is used for meeting the practical requirement of adjusting and monitoring the runout of a main shaft in the sealing performance test of a graphite sealing ring.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a graphite seal test shaft runout adjusting and measuring device which comprises an adjusting box body, a graphite seal test device, a rotor runout adjusting device and a measuring device, wherein the adjusting box body is provided with a groove; the graphite sealing experimental device comprises a main shaft, a supporting bearing, a support and a graphite sealing ring test piece, wherein a coaxial through hole is formed in the front and the back of the adjusting box body, and the main shaft penetrates through the adjusting box body and is rotatably arranged in the coaxial through hole through the supporting bearing; the first end of the main shaft is used for connecting a driving system, the graphite sealing ring test piece is arranged at the upper part of the support, and the second end of the main shaft penetrates through the graphite sealing ring test piece; the rotor runout adjusting device comprises a bearing box, the bearing box is arranged in the adjusting box body, an adjusting bearing is assembled in the bearing box, the inner ring of the adjusting bearing is assembled with the main shaft, the bearing box is connected with a radial adjusting device, and the radial adjusting device is used for driving the bearing box to move up and down; the main shaft is provided with a main shaft jumping measuring point, the main shaft jumping measuring point is close to the graphite sealing ring test piece, and the measuring device is close to the main shaft jumping measuring point and used for measuring the jumping of the main shaft jumping measuring point.
Preferably, the adjusting box body comprises a box body and a box cover, the box cover is located above the box body, and the box body is connected with the box cover through a connecting piece.
Preferably, an oil system is further arranged in the adjusting box body, and the oil system comprises a first oil channel, a second oil channel, an oil inlet ring, an oil inlet nozzle and an oil plug; the first lubricating oil channel is arranged in the wall of the box body, the second lubricating oil channel is arranged on the box cover, the first lubricating oil channel is communicated with the second lubricating oil channel, one end, far away from the first lubricating oil channel, of the second lubricating oil channel is connected with a lubricating oil inlet nozzle, the supporting bearing and the adjusting bearing are both provided with oil inlet rings, and one end, far away from the second lubricating oil channel, of the first lubricating oil channel is communicated with the oil inlet ring;
the number of the first lubricating oil channels is two, the two first lubricating oil channels are respectively arranged in the front and back box walls of the box body, and the number of the second lubricating oil channels and the number of the lubricating oil inlet nozzles are correspondingly two;
the bottom of the side face of the box body is provided with the oil plug.
Preferably, the upper part of the support is provided with a mounting hole, and the graphite sealing ring test piece is fixedly mounted in the mounting hole.
Preferably, an air guide cover is installed on one side of the support far away from the adjusting box body, an air inlet is formed in the end portion of the air guide cover and used for introducing high-pressure air, the second end of the spindle extends into a cavity of the air guide cover, and a sealing gasket is arranged between the air guide cover and the support; and a graphite sealing ring retainer ring is arranged on one side of the support close to the adjusting box body.
Preferably, be close to the support bearing pass through movable bearing seat install in the coaxial through-hole, the position department cover that is close to first end on the main shaft is established there is the bearing safety cover, the bearing safety cover install in adjust on the box.
Preferably, the radial adjusting device comprises an adjusting screw rod and an axial support, a fixing hole is formed in the center of a box cover of the adjusting box body, and the axial support is fixed in the fixing hole and fixedly connected with the box cover; the bottom of the adjusting screw rod is connected with the top of the bearing box through a bowl group bearing, the top of the adjusting screw rod penetrates through the axial support and is connected with a rotating wheel or a progress motor, and the adjusting screw rod is in threaded connection with the axial support; the lower part of the rotating wheel is provided with an adjusting scale.
Preferably, two sides of the adjusting bearing are respectively provided with a spring retainer ring.
Preferably, the support bearing and the adjusting bearing both adopt self-aligning bearings.
Preferably, the measuring device adopts a laser displacement sensor.
Compared with the prior art, the invention has the following beneficial technical effects:
the rotor runout adjusting device can adjust the rotating posture of the main shaft and adjust the runout of the main shaft, the measuring device can measure the runout amount of a main shaft runout measuring point, and the rotor runout adjusting device can adjust the main shaft runout accurately according to the measured runout amount; the cavity formed by the gas-guiding cover, the graphite sealing ring test piece and the end part of the main shaft can be filled with high-pressure gas in an experiment, a supposed working environment of the graphite sealing ring is created, the main shaft can rotate under the driving of a driving system, and the surface of the main shaft as a graphite sealing ring track can also form a dynamic sealing surface relative to the graphite sealing ring test piece in high-speed rotation, so that the gas flow is blocked, and the sealing effect is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a sectional view of the general structure of a shaft run-out adjustment measuring device for a graphite seal test of the invention;
FIG. 2 is a three-dimensional effect diagram of the overall appearance of the shaft runout adjusting and measuring device for the graphite sealing test of the invention;
FIG. 3 is a three-dimensional effect diagram of the case body and the case cover taken along a vertical plane and cut off on the basis of FIG. 2;
FIG. 4 is an assembled three-dimensional effect of the rotor runout adjustment apparatus of the present invention;
FIG. 5 is a schematic view of the principle of manually adjusting spindle runout according to the present invention;
FIG. 6 is a schematic diagram illustrating the principle of automatically adjusting spindle runout according to the present invention; .
In the figure: 1, a box body; 2, a box cover; 3, a main shaft; 4, a bearing box; 5, adjusting a screw rod; 6, axial support; 7, a rotating wheel; 8, a movable bearing seat; 9, supporting the bearing; 10, adjusting a bearing; 11, a spring collar; 12, a bearing protection cover; 13, a lubricating oil inlet nozzle; 14, oil plug; 15, adjusting the assembly baffle; 16, a laser displacement sensor; 17, a support; 18, a gas introduction cover; 19, testing a graphite sealing ring; 20, a sealing gasket; 21, graphite sealing ring retainer rings;
001, a first oil passage; 002, a second oil gallery; 003, connecting pieces; 004, a bowl group bearing; 005, an oil inlet ring; 006, main shaft runout measuring point; 007, adjusting scales; 008, socket head cap screw; 009, a laser emission window; 010, reflecting the laser receiving window; 011, an air inlet; 012, main shaft end surface.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a shaft runout adjusting and measuring device for a graphite sealing test, which is used for meeting the practical requirement of adjusting and monitoring the runout of a main shaft in the sealing performance test of a graphite sealing ring.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 3, the present embodiment provides a graphite seal test shaft runout adjustment measuring apparatus, which mainly includes an adjustment box, a graphite seal experiment apparatus, a rotor runout adjustment apparatus, and a measuring apparatus.
The adjusting box body mainly comprises a box body 1 and a box cover 2, and certainly comprises a lubricating oil system, and the adjusting box body plays a role of a bracket and a shell in the whole device. The box body 1 and the box cover 2 are assembled and connected by a plurality of inner hexagon screws as connecting pieces 003. The middle of the wall surfaces of the front surface and the back surface of the box body is provided with a coaxial through hole penetrating through the two parallel wall surfaces.
In this embodiment, the lubricating oil system includes a lubricating oil inlet nozzle 13, a first lubricating oil channel 001 in the wall of the box body, a second lubricating oil channel 002 in the cover plate of the box, and oil inlet rings 005 between each pair of bearings, lubricating oil is injected into the whole graphite seal test shaft runout adjustment measuring device through two lubricating oil inlet nozzles 13 installed on the top of the box cover 2, and is distributed to each rotating part in the device by the first lubricating oil channel 001 and the second lubricating oil channel 002 to provide lubrication and cooling, for example, a lubricating oil guiding structure of the oil inlet ring 005 is arranged near three bearings, and the waste oil with increased temperature can pass through an oil plug discharger close to the base on the side of the box body, so as to avoid the waste oil from gathering.
In this embodiment, the graphite sealing experimental device includes a main shaft 3, a movable bearing seat 8, a support bearing 9, a bearing protection cover 12, a support seat 17, a gas guide cover 18, a graphite sealing ring test piece 19, a sealing gasket 20 and a graphite sealing ring retainer ring 21. As shown in fig. 1, the left end of the spindle 3 is connected to a driving system (e.g., a driving motor); the right spindle end 012 is inserted into the cavity of the scoop 18 and supported by two support bearings 9 as a fulcrum, as shown in fig. 3. The graphite sealing ring test piece 19 is fixedly arranged in an upper mounting hole of the support 17 under the action of the graphite sealing ring retainer ring 21 and the air guide cover 18, and the spindle 3 penetrates through the center of the graphite sealing ring test piece 19 and is in interference fit. The chamber formed by the gas-guiding cover 18, the graphite sealing ring test piece 19 and the end portion 012 of the spindle is filled with high-pressure gas in the experiment, so that the supposed working environment of the graphite sealing ring is created. The main shaft 3 can rotate under the driving of the driving system, and the surface of the main shaft as a graphite sealing ring runway can also form a dynamic sealing surface relative to the graphite sealing ring test piece 19 when rotating at a high speed, so that the gas flow is blocked, and the sealing effect is achieved.
In the present embodiment, two support bearings 9 of the same type are respectively mounted in the two horizontal coaxial through holes of the front and rear wall surfaces of the box body 1 by the above-mentioned plurality of mounting components, that is, the two support bearings 9 are also coaxial. The main shaft 3 and the box body 1 establish coaxial and coincident constraint through the two supporting bearings 9, and theoretically, the main shaft 3 can rotate around the axes of the two coaxial through holes at high speed under the driving of an external driving system.
In this embodiment, the rotor runout adjusting device is a subsystem for adjusting the rotation posture of the spindle 3 and adjusting the runout of the spindle. The rotor runout adjusting device mainly comprises a bearing box 4, an adjusting screw rod 5, an axial support 6, a rotating wheel 7, an adjusting bearing 10 and a spring retainer ring 11.
In this embodiment, the surface center point of case lid 2 is opened has a through-hole, and axial bearing 6 links firmly through hexagon socket head cap screw 008 with case lid 2, and whole rotor adjusting device that beats also links to each other with the regulating box through axial bearing 6. As shown in fig. 4, the adjusting screw rod 5 has a thread on its side surface, which is in threaded engagement with the through hole in the middle of the axial support 6, and the adjusting screw rod 5 can make up-and-down helical motion relative to the axial support 6. The runner 7 as the servo regulator device is fixedly connected with the upper end of the adjusting screw rod 5, and meanwhile, the adjusting screw rod 5 is connected with the bearing box 4 through the bowl group bearing 004, namely when the adjusting screw rod 5 performs spiral motion along a thread line relative to the axial bearing 6, the adjusting screw rod 5 performs rotary motion relative to the bearing box 4, so that the bearing box 4 moves up and down together with the bearing box.
When the lead angle of the thread of the side surface of the lead screw 5 is sufficiently small, the very small size but precise ascent or descent of the bearing housing 4 can be achieved by rotating the runner 7 in cooperation with the adjustment scale 007 at the bottom of the side surface of the runner 7. As shown in fig. 1, the adjusting bearing 10 is assembled in the bearing housing 4 and is coaxial with the bearing 4, the adjusting bearing 10 is internally assembled with the main shaft 3, and a pair of spring collars 11 position the adjusting bearing 10 at a fixed position on the main shaft 3 to prevent relative axial sliding.
In conclusion, the eccentricity of a supporting point formed on the main shaft by one of the supporting bearings can be adjusted by adjusting the adjusting paths of the rotating wheel 7, the adjusting screw rod 5, the bearing box 4, the adjusting bearing 10 and the main shaft 3, so that the main shaft jumping quantity near the graphite sealing ring required by the experiment can be obtained.
In this embodiment, the working principle of the rotor runout adjusting device is as follows: the support bearing 9 of the self-aligning bearing is selected to play a role of supporting the main shaft 3, and simultaneously, the jumping range of the main shaft 3 is released; at this time, the rotor runout adjusting device with the adjusting bearing 10 (also selecting a self-aligning bearing) at the middle position of the two supporting bearings 9 limits the runout of the main shaft 3, so that the main shaft 3 keeps the runout degree required by the experiment.
After the rotor jumping adjusting device controls jumping, one end of the main shaft 3 is connected with a graphite sealing ring experimental device, a graphite sealing ring test piece 19 is statically fixed in a special support 7, and a section of surface of the main shaft 3 serves as a sealing runway of the graphite sealing ring test piece 19; and an air guide cover 18 is arranged on one side of the inlet of a sealing surface formed by the graphite sealing ring test piece 19 and the sealing track, and can guide high-pressure gas to provide a simulated working condition environment required by a graphite sealing experiment.
In this embodiment, the measuring device is disposed near the outlet of the sealing surface to measure the runout of the main shaft runout measuring point 006 near the graphite sealing ring runway, the core component of the measuring device is a laser displacement sensor 16, and the measuring principle is as follows: as shown in fig. 1, the laser emitter inside the laser displacement sensor 16 emits laser light from the laser emission window 009 along the schematic dotted line to irradiate onto the surface of the spindle 3 reaching the spindle runout measuring point 006, and generates scattering, wherein a part of the laser light returns to the laser displacement sensor 16 through the reflective laser receiving window 010 along the schematic dotted line and is received by the internal CCD (charge coupled device) linear camera, and knowing the physical distance between the laser emitter and the CCD linear camera and the incident angle of the scattered laser light imaged on the camera, the distance between the laser irradiated spindle runout measuring point 006 and the laser displacement sensor 16 can be calculated by the trigonometric correlation mathematical calculation theorem. By measuring the distance between the spindle and the spindle runout measuring point 006 at a high frequency within a certain period of time, a range of values of the distance between the spindle and the spindle can be obtained within the certain period of time, and the information of the runout amount of the spindle runout measuring point 006 can be obtained.
As shown in fig. 5 and 6, in the present embodiment, high-precision adjustment can be performed manually or automatically by the rotor runout adjustment device according to the displayed runout amount.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not to be construed as limiting the claims.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. The utility model provides a graphite seal test axle is beated and is adjusted measuring device which characterized in that: the device comprises an adjusting box body, a graphite sealing experiment device, a rotor runout adjusting device and a measuring device; the graphite sealing experimental device comprises a main shaft, a supporting bearing, a support and a graphite sealing ring test piece, wherein the front side and the back side of the adjusting box body are respectively provided with a coaxial through hole, and the main shaft penetrates through the adjusting box body and is rotatably arranged in the coaxial through holes through the supporting bearing; the first end of the main shaft is used for connecting a driving system, the graphite sealing ring test piece is arranged at the upper part of the support, and the second end of the main shaft penetrates through the graphite sealing ring test piece; the rotor runout adjusting device comprises a bearing box, the bearing box is arranged in the adjusting box body, an adjusting bearing is assembled in the bearing box, the inner ring of the adjusting bearing is assembled with the main shaft, the bearing box is connected with a radial adjusting device, and the radial adjusting device is used for driving the bearing box to move up and down; a main shaft jumping measuring point is arranged on the main shaft, the main shaft jumping measuring point is arranged close to the graphite sealing ring test piece, and the measuring device is arranged close to the main shaft jumping measuring point and is used for measuring the jumping of the main shaft jumping measuring point;
the radial adjusting device comprises an adjusting screw rod and an axial support, a fixing hole is formed in the center of a box cover of the adjusting box body, and the axial support is fixed in the fixing hole and fixedly connected with the box cover; the bottom of the adjusting screw rod is connected with the top of the bearing box through a bowl group bearing, the top of the adjusting screw rod penetrates through the axial support and is connected with a rotating wheel or a progress motor, and the adjusting screw rod is in threaded connection with the axial support; the lower part of the rotating wheel is provided with an adjusting scale.
2. The graphite seal test shaft run-out adjustment measuring device of claim 1, characterized in that: the adjusting box body comprises a box body and a box cover, the box cover is located above the box body, and the box body is connected with the box cover through a connecting piece.
3. The graphite seal test shaft runout adjusting and measuring device of claim 2, characterized in that: the regulating box body is internally provided with a lubricating oil system, and the lubricating oil system comprises a first lubricating oil channel, a second lubricating oil channel, an oil inlet ring, a lubricating oil inlet nozzle and an oil plug; the first lubricating oil channel is arranged in the wall of the box body, the second lubricating oil channel is arranged on the box cover, the first lubricating oil channel is communicated with the second lubricating oil channel, one end, far away from the first lubricating oil channel, of the second lubricating oil channel is connected with a lubricating oil inlet nozzle, the supporting bearing and the adjusting bearing are both provided with oil inlet rings, and one end, far away from the second lubricating oil channel, of the first lubricating oil channel is communicated with the oil inlet ring;
the number of the first lubricating oil channels is two, the two first lubricating oil channels are respectively arranged in the front and back box walls of the box body, and the number of the second lubricating oil channels and the number of the lubricating oil inlet nozzles are correspondingly two;
the bottom of the side face of the box body is provided with the oil plug.
4. The graphite seal test shaft run-out adjustment measuring device of claim 1, characterized in that: the upper portion of support is provided with the mounting hole, graphite sealing ring test piece fixed mounting in the mounting hole.
5. The graphite seal test shaft run-out adjustment measuring device of claim 4, characterized in that: an air guide cover is installed on one side, away from the adjusting box body, of the support, an air inlet is formed in the end portion of the air guide cover and used for introducing high-pressure air, the second end of the spindle extends into a cavity of the air guide cover, and a sealing gasket is arranged between the air guide cover and the support; and a graphite sealing ring retainer ring is arranged on one side of the support close to the adjusting box body.
6. The graphite seal test shaft run-out adjustment measuring device of claim 1, characterized in that: being close to the support bearing pass through movable bearing seat install in the coaxial through-hole, the position department cover that is close to first end on the main shaft is established there is the bearing safety cover, the bearing safety cover install in adjust on the box.
7. The graphite seal test shaft run-out adjustment measuring device of claim 1, characterized in that: and two sides of the adjusting bearing are respectively provided with a spring retainer ring.
8. The graphite seal test shaft runout adjusting and measuring device of claim 1, characterized in that: the supporting bearing and the adjusting bearing both adopt self-aligning bearings.
9. The graphite seal test shaft run-out adjustment measuring device of claim 1, characterized in that: the measuring device adopts a laser displacement sensor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110334768.2A CN113074636B (en) | 2021-03-29 | 2021-03-29 | Graphite seal test axle is beated and is adjusted measuring device |
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| CN202110334768.2A CN113074636B (en) | 2021-03-29 | 2021-03-29 | Graphite seal test axle is beated and is adjusted measuring device |
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| CN113074636A CN113074636A (en) | 2021-07-06 |
| CN113074636B true CN113074636B (en) | 2022-11-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS62102952A (en) * | 1985-10-31 | 1987-05-13 | Kuroda Precision Ind Ltd | Positioning device |
| CN103558016B (en) * | 2013-10-25 | 2016-04-20 | 中国航空动力机械研究所 | Full working scope seal test device |
| CN104985201B (en) * | 2015-07-22 | 2017-04-26 | 西安交通大学 | Programmable intelligent electric spindle |
| CN206399385U (en) * | 2016-12-05 | 2017-08-11 | 河南科技大学 | A kind of measurement apparatus of bearing inner race circular runout |
| CN109176153A (en) * | 2018-09-21 | 2019-01-11 | 哈尔滨工业大学 | A kind of mechanical rotating error of axis active compensation device based on piezoelectric actuator |
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