CN106441887B - The measurement method of contact load between a kind of turntable bearing rolling element and outer ring raceway - Google Patents
The measurement method of contact load between a kind of turntable bearing rolling element and outer ring raceway Download PDFInfo
- Publication number
- CN106441887B CN106441887B CN201610803717.9A CN201610803717A CN106441887B CN 106441887 B CN106441887 B CN 106441887B CN 201610803717 A CN201610803717 A CN 201610803717A CN 106441887 B CN106441887 B CN 106441887B
- Authority
- CN
- China
- Prior art keywords
- displacement sensor
- eddy current
- turntable bearing
- current displacement
- mounting hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Rolling Contact Bearings (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The present invention relates to a kind of measurement methods of contact load between turntable bearing rolling element and outer ring raceway, belong to field of scientific study.The present invention processes eddy current displacement sensor mounting hole first；Eddy current displacement sensor is installed in eddy current displacement sensor mounting hole by eddy current displacement sensor installation set, by eddy current displacement sensor measure turntable bearing it is loaded when tested surface displacement；The displacement of tested surface is converted into contact load.The present invention realizes the measurement of contact load between rolling element and raceway；Multiple eddy current displacement sensor mounting holes can be along the circumferential direction processed in turntable bearing outer ring, and multiple eddy current displacement sensors are installed and are measured.
Description
Technical field
The present invention relates to a kind of measurement method of contact load between turntable bearing rolling element and outer ring raceway, the science of belonging to is ground
Study carefully field.
Background technique
Respectively have two raceways on the inside and outside circle of single 4 angular contact ball turntable bearings, two raceways on each lasso by
The circular arc that two sections of centers are not overlapped is constituted.The Tumbler disc bearing structure of the type is compact, light-weight, steel ball and raceway are at 4 points and connect
Touching, can bear axial force, radial force and tilting moment simultaneously.In rotary manipulator, middle-size and small-size crane and excavation
It has a very wide range of applications in the engineering machinery such as machine, the yaw of wind-driven generator, pitch variable bearings are also a large amount of using 4 points at present
Contact the turntable bearing of spherical structure.
Most turntable bearing is relatively large sized and is widely used in large-scale engineering machinery, and safety issue is outstanding
For protrusion, thus numerous researchers discuss the type selection calculation problem of turntable bearing, these type selection calculations rely on turntable bearing more
Load-torque endurance curves.The endurance curves of turntable bearing are turntable bearing utmost carrying abilities allowable during the work time,
Middle dead load endurance curves refer to bearing dead load when turntable bearing rolling element and raceway contact point reach allowable contact stress
Bearing capacity；Dynamic loading endurance curves refer to the turntable bearing of the identical structure size of a batch, wherein 90% service life reaches
Or be above standard working cycles number when dynamic loading endurance curves, the carryings of the various turntable bearing manufacturers of comparative analysis is bent
It can be found that even if same material, type be consistent, the identical turntable bearing of size, endurance curves are also not quite similar, make line chart
It is the difference of turntable bearing load distribution calculation method at the main reason of endurance curves difference.
As other kinds of turntable bearing, single four point touching ball slewing bearing is typically also to make revolving speed very when working
Low rotary motion or intermittent oscillation, the stress variation number on each element is seldom relative to other rolling bearings, so it is led
Wanting failure mode is the plastic deformation that each element generates under dead load or impact loading, local spot corrosion, peeling and rolling
Kinetoplast is broken etc..The main failure forms of turntable bearing determine the significance of internal load distribution analysis.Load
Distribution determines the size of loaded maximum rolling body position and load value；Load distribution in bearing is also inside and outside circle
The bolt strength being coupled with external structure, which is checked, provides significant data；In addition, the load distribution of Bearing inner determines fixation
Relative displacement between circle and active ring, determines the rigidity of bearing indirectly.
Current Domestic is mainly theory analysis to the research that turntable bearing load is distributed, and to same bearing using not
It is also not quite similar with the result that method obtains.So calculated result must be compared with experimental bench experimental data.And factory
The service life for producing turntable bearing mostly uses greatly experimental bench to test to obtain with reliability.If necessary to study turntable shaft deeper into ground
It holds, proposes more accurate theoretical model with regard to more needing to be tested by experimental bench.And these experiments are completed, it must solve first
The certainly measurement of turntable bearing interior contact load.
Summary of the invention
The present invention provides a kind of measurement methods of contact load between turntable bearing rolling element and outer ring raceway, to solve to turn
Dish axle holds the measurement problem of interior contact load, is convenient for the correlative study of turntable bearing contact load distribution.
The technical scheme is that between a kind of turntable bearing rolling element and outer ring raceway contact load measurement method,
Specific step is as follows for the method:
Step1, processing 4 mounting hole of eddy current displacement sensor: current vortex displacement sensing is machined in turntable bearing outer ring 5
4 mounting hole of device, the nominal diameter of 4 mounting hole of eddy current displacement sensor are b and b >=a, 4 mounting hole of eddy current displacement sensor
Axis and perpendicular to the angle between the sagittal plane of turntable bearing axis be equal to turntable bearing initial contact angle and current vortex
The axis and turntable bearing axis of 4 mounting hole of displacement sensor in the same plane, indulge by 4 mounting hole of eddy current displacement sensor
Meet the variation range of tested surface displacement under to depth between the resolution ratio and range of eddy current displacement sensor 4；
Wherein, a indicates the minimum tested surface diameter of eddy current displacement sensor 4, and the bottom surface of 4 mounting hole of eddy current displacement sensor is quilt
Survey face；
Step2, installation eddy current displacement sensor 4 simultaneously measure: eddy current displacement sensor 4 is passed by current vortex displacement
Sensor installation set 3 is installed in 4 mounting hole of eddy current displacement sensor, measures turntable bearing by eddy current displacement sensor 4
The displacement of tested surface when loaded；
Step3, the displacement of tested surface is converted into contact load: by Finite Element Simulation Analysis simulate turntable bearing by
Carrying can be obtained the displacement of tested surface after condition calculating and issWhen, the contact load between 5 raceway of rolling element 2 and turntable bearing outer ring is；
Again by least square method, these corresponding datas are fitted to displacement and rolling element 2 and 5 raceway of turntable bearing outer ring of tested surface
Between contact load conversion formula:
F=As 3+Bs 2+Cs+D
Wherein,A、B、CWithDCoefficient to be acquired by least square method.
The turntable bearing is the single four-point contact ball formula turntable bearing of Non-tooth type.
Wherein, in finite element analysis, using ANSYS finite element analysis software.Eddy current displacement sensor 4 can be static
The tested surface of measured body 6 is measured to dynamically non-contact, high linearity, high-resolution away from the distance between detecting head surface.It is
A kind of non-contacting linearisation metering outfit, can accurately measure measured body 6(must be metallic conductor) tested surface and sound end
Static and dynamic relative displacement variation between face.In addition, for the measurement performance for guaranteeing eddy current displacement sensor 4, measured body 6
On tested surface cannot be less than minimum tested surface, and minimum tested surface is usually indicated with diameter for the disc of a.
The beneficial effects of the present invention are:
Since rolling element and the contact stress of raceway contact point are very big (more than 1GPa), can not directly be measured with sensor
Contact load out also can not directly measure juxtaposition metamorphose.And above indirect measurement method, it realizes between rolling element and raceway
The measurement of contact load.
Multiple eddy current displacement sensor mounting holes can be along the circumferential direction processed in turntable bearing outer ring, and multiple electricity are installed
Eddy displacement sensor measures.Wherein, eddy current displacement sensor mounting hole position circumferentially and current vortex displacement pass
The quantity of sensor mounting hole is depending on specific research purpose.Can be obtained turntable bearing it is loaded when, circumferencial direction different location
Contact load carries out the correlative study of turntable bearing interior contact load distribution.
In the Fundamentals of Measurement for realizing the distribution of turntable bearing interior contact load, the number and distribution of attachment bolt can be studied
And the influence that structure of turntable bearing bracket etc. is distributed turntable bearing interior contact load, and then to the number of attachment bolt
It is optimized with the structure of distribution and bracket.
Detailed description of the invention
Fig. 1 is the single 4 points structural schematic diagrams for connecing place's ball-type turntable bearing；
Fig. 2 is the single 4 points STRUCTURE DECOMPOSITION diagrams for connecing place's ball-type turntable bearing；
Fig. 3 is the operation schematic diagram of eddy current displacement sensor；
Fig. 4 is the scheme of installation of eddy current displacement sensor and installation set；
Fig. 5 is the scheme of installation of eddy current displacement sensor and turntable bearing；
Fig. 6 is the installation sectional view of eddy current displacement sensor and turntable bearing；
Each label in figure: 1- turntable bearing inner ring, 2- rolling element, 3- displacement sensor installation set, 4- current vortex displacement pass
Sensor, 5- turntable bearing outer ring, 6- measured body, the axis of L1- eddy current displacement sensor mounting hole, L2- turntable bearing axis,
E- is perpendicular to the sagittal plane of turntable bearing axis, the axis of c- eddy current displacement sensor mounting hole and perpendicular to turntable bearing
Angle between the sagittal plane of axis.
Specific embodiment
Embodiment 1: as shown in figures 1 to 6, the measurement method of contact load between a kind of turntable bearing rolling element and outer ring raceway,
Specific step is as follows for the method:
Step1, processing 4 mounting hole of eddy current displacement sensor: current vortex displacement sensing is machined in turntable bearing outer ring 5
4 mounting hole of device, the nominal diameter of 4 mounting hole of eddy current displacement sensor are b and b >=a, 4 mounting hole of eddy current displacement sensor
Axis and perpendicular to the angle between the sagittal plane of turntable bearing axis be equal to turntable bearing initial contact angle and current vortex
The axis and turntable bearing axis of 4 mounting hole of displacement sensor in the same plane, indulge by 4 mounting hole of eddy current displacement sensor
Meet the variation range of tested surface displacement under to depth between the resolution ratio and range of eddy current displacement sensor 4；
Wherein, a indicates the minimum tested surface diameter of eddy current displacement sensor 4, and the bottom surface of 4 mounting hole of eddy current displacement sensor is quilt
Survey face；
Step2, installation eddy current displacement sensor 4 simultaneously measure: eddy current displacement sensor 4 is passed by current vortex displacement
Sensor installation set 3 is installed in 4 mounting hole of eddy current displacement sensor, measures turntable bearing by eddy current displacement sensor 4
The displacement of tested surface when loaded；
Step3, the displacement of tested surface is converted into contact load: by Finite Element Simulation Analysis simulate turntable bearing by
Carrying can be obtained the displacement of tested surface after condition calculating and issWhen, the contact load between 5 raceway of rolling element 2 and turntable bearing outer ring is；Again by least square method, these corresponding datas are fitted to displacement and rolling element 2 and the turntable bearing outer ring 5 of tested surface
The conversion formula of contact load between raceway:
F=As 3+Bs 2+Cs+D
Wherein,A、B、CWithDCoefficient to be acquired by least square method.
The turntable bearing is the single four-point contact ball formula turntable bearing of Non-tooth type.
Embodiment 2: as shown in figures 1 to 6, the measurement method of contact load between a kind of turntable bearing rolling element and outer ring raceway,
Specific step is as follows for the method:
Step1, processing 4 mounting hole of eddy current displacement sensor: current vortex displacement sensing is machined in turntable bearing outer ring 5
4 mounting hole of device, the nominal diameter of 4 mounting hole of eddy current displacement sensor are b and b >=a, 4 mounting hole of eddy current displacement sensor
Axis and perpendicular to the angle between the sagittal plane of turntable bearing axis be equal to turntable bearing initial contact angle and current vortex
The axis and turntable bearing axis of 4 mounting hole of displacement sensor in the same plane, indulge by 4 mounting hole of eddy current displacement sensor
Meet the variation range of tested surface displacement under to depth between the resolution ratio and range of eddy current displacement sensor 4；
Wherein, a indicates the minimum tested surface diameter of eddy current displacement sensor 4, and the bottom surface of 4 mounting hole of eddy current displacement sensor is quilt
Survey face；
Step2, installation eddy current displacement sensor 4 simultaneously measure: eddy current displacement sensor 4 is passed by current vortex displacement
Sensor installation set 3 is installed in 4 mounting hole of eddy current displacement sensor, measures turntable bearing by eddy current displacement sensor 4
The displacement of tested surface when loaded；
Step3, the displacement of tested surface is converted into contact load: by Finite Element Simulation Analysis simulate turntable bearing by
Carrying can be obtained the displacement of tested surface after condition calculating and issWhen, the contact load between 5 raceway of rolling element 2 and turntable bearing outer ring is；Again by least square method, these corresponding datas are fitted to displacement and rolling element 2 and the turntable bearing outer ring 5 of tested surface
The conversion formula of contact load between raceway:
F=As 3+Bs 2+Cs+D
Wherein,A、B、CWithDCoefficient to be acquired by least square method.
Embodiment 3: as shown in figures 1 to 6, the single four-point contact ball formula of measurement Luoyang Beaving Factory's model 787/434G2 turns
Dish axle is held (Non-tooth type), and such turntable bearing is mainly made of inner ring, outer ring and rolling element, and Internal and external cycle can relatively rotate.Its
In, inner ring and outer ring is assembled by rolling element, and is point contact between rolling element and Internal and external cycle.And turntable bearing it is loaded when,
The active force that rolling element and Internal and external cycle raceway are generated by point contact is the contact load between turntable bearing rolling element and raceway,
When the contact load that the present invention measures is that turntable bearing is loaded, the contact load between rolling element and outer ring raceway.
Select displacement sensor: the model BAWM12MG2-IAC20B-BP00,2- of selection Germany balluff Baruch husband
The eddy current displacement sensor of GS04, the range of the eddy current displacement sensor are 2mm, and resolution ratio is 0.5 μm of (current vortex displacement
The least displacement that sensor can measure), installation thread size is M12, and minimum tested surface basal diameter is 20mm.
Processing eddy current displacement sensor mounting hole: eddy current displacement sensor mounting hole is threaded hole and is machined in 787/
The outer ring of 434G2 turntable bearing, eddy current displacement sensor mounting hole bottom surface is tested surface.Eddy current displacement sensor installation
The axis in hole and the initial contact for being equal to 787/434G2 turntable bearing perpendicular to the angle between the sagittal plane of turntable bearing axis
30 ° of angle, and the axis of eddy current displacement sensor mounting hole and turntable bearing axis are in the same plane.According to selected Germany
The minimum of the eddy current displacement sensor of the model BAWM12MG2-IAC20B-BP00,2-GS04 of balluff Baruch husband is tested
Face diameter is the requirement of 20mm, the thread size of displacement sensor mounting hole is set to M20mm (nominal diameter 20mm), and lead to
It crosses displacement sensor installation set 3 displacement sensor that the eddy current displacement sensor that installation dimension is M12 is installed on M20 is installed
Kong Zhong.Pass through Finite Element Simulation Analysis, when longitudinal depth of displacement sensor mounting hole is 27mm, quilt when turntable bearing is loaded
The displacement in survey face is between 3.96 μm to 84.78 μm.The displacement of tested surface is greater than the resolution ratio of selected eddy current displacement sensor
And it is less than its range, therefore longitudinal depth of displacement sensor mounting hole is 27mm, displacement sensor mounting hole bottom surface extremely turns at this time
It is about 5mm that dish axle, which holds the thickness between the outer ring raceway of 787/434G2,.
Installation eddy current displacement sensor simultaneously measures: eddy current displacement sensor is installed by eddy current displacement sensor
Set be installed in eddy current displacement sensor mounting hole, can measure turntable bearing it is loaded when measured body displacement.
The displacement of tested surface is converted into contact load: by Finite Element Simulation Analysis, simulating the loaded work of turntable bearing
Condition, the displacement that tested surface can be obtained after calculating areWhen, the contact load between 5 raceway of rolling element 2 and turntable bearing outer ring is
.It is as shown in the table:
Again by least square method, these corresponding datas are fitted to outside the displacement and rolling element and turntable bearing of tested surface
The conversion formula of contact load between circle raceway:
F=0.0004s 3 +0.4404s 2 +255.0353s-14.1476
Wherein,sThe tested surface displacement surveyed by eddy current displacement sensor,FFor 787/434G2 turntable bearing rolling element with
Contact load between outer ring raceway.
Above in conjunction with attached drawing, the embodiment of the present invention is explained in detail, but the present invention is not limited to above-mentioned
Embodiment within the knowledge of a person skilled in the art can also be before not departing from present inventive concept
Put that various changes can be made.
Claims (2)
1. the measurement method of contact load between a kind of turntable bearing rolling element and outer ring raceway, it is characterised in that: the method
Specific step is as follows:
Step1, processing eddy current displacement sensor (4) mounting hole: current vortex displacement sensing is machined in turntable bearing outer ring (5)
Device (4) mounting hole, the nominal diameter of eddy current displacement sensor (4) mounting hole are b and b >=a, eddy current displacement sensor (4)
The axis of mounting hole and perpendicular to the angle between the sagittal plane of turntable bearing axis be equal to turntable bearing initial contact angle and
The axis of eddy current displacement sensor (4) mounting hole and turntable bearing axis in the same plane, eddy current displacement sensor (4)
Longitudinal depth of mounting hole meet the variation range of tested surface displacement between the resolution ratio of eddy current displacement sensor (4) and
Between range；Wherein, a indicates the minimum tested surface diameter of eddy current displacement sensor (4), eddy current displacement sensor (4) peace
The bottom surface for filling hole is tested surface；
Step2, installation eddy current displacement sensor (4) simultaneously measure: eddy current displacement sensor (4) is passed by current vortex displacement
Sensor installation set (3) is installed in eddy current displacement sensor (4) mounting hole, is measured and is turned by eddy current displacement sensor (4)
The displacement of tested surface when dish axle bears to carry；
Step3, the displacement of tested surface is converted into contact load: simulates the loaded work of turntable bearing by Finite Element Simulation Analysis
The displacement of tested surface can be obtained after calculating in conditionsWhen, the contact load between rolling element (2) and turntable bearing outer ring (5) raceway isF；Again by least square method, these corresponding datas are fitted to displacement and rolling element (2) and the turntable bearing outer ring of tested surface
(5) between raceway contact load conversion formula:
F=As 3+Bs 2+Cs+D
Wherein,A、B、CWithDCoefficient to be acquired by least square method.
2. the measurement method of contact load, feature between turntable bearing rolling element according to claim 1 and outer ring raceway
Be: the turntable bearing is the single four-point contact ball formula turntable bearing of Non-tooth type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610803717.9A CN106441887B (en) | 2016-09-06 | 2016-09-06 | The measurement method of contact load between a kind of turntable bearing rolling element and outer ring raceway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610803717.9A CN106441887B (en) | 2016-09-06 | 2016-09-06 | The measurement method of contact load between a kind of turntable bearing rolling element and outer ring raceway |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106441887A CN106441887A (en) | 2017-02-22 |
| CN106441887B true CN106441887B (en) | 2019-03-26 |
Family
ID=58163978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610803717.9A Active CN106441887B (en) | 2016-09-06 | 2016-09-06 | The measurement method of contact load between a kind of turntable bearing rolling element and outer ring raceway |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106441887B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109063401B (en) * | 2018-10-17 | 2022-07-19 | 吉林大学 | Method for realizing structural contact force optimization by adopting equivalent static displacement |
| CN112284575B (en) * | 2020-09-18 | 2021-12-28 | 西安交通大学 | On-line bearing load monitoring method based on eddy current displacement sensor |
| CN111985141B (en) * | 2020-09-18 | 2024-03-22 | 河南科技大学 | Method for determining allowable contact stress of surface hardening raceway of turntable bearing |
| CN113280962A (en) * | 2021-06-30 | 2021-08-20 | 洛阳斯特林智能传动科技有限公司 | Axial load detection device of turntable bearing and shield machine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020057856A1 (en) * | 2000-05-17 | 2002-05-16 | Bailey Ted E. | Real time bearing load sensing |
| CN1687728A (en) * | 2005-05-24 | 2005-10-26 | 浙江大学 | Method and device for measuring friction force of bearing under tiny load |
| CN1856699A (en) * | 2003-09-24 | 2006-11-01 | Skf股份公司 | Method and sensor arrangement for load measurement on rolling element bearing based on model deformation |
| CN101292090A (en) * | 2005-09-06 | 2008-10-22 | 蒂姆肯公司 | Load-sensing bearing |
| CN103292995A (en) * | 2013-05-28 | 2013-09-11 | 常州大学 | rolling bearing detection and fault diagnosis device and method |
-
2016
- 2016-09-06 CN CN201610803717.9A patent/CN106441887B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020057856A1 (en) * | 2000-05-17 | 2002-05-16 | Bailey Ted E. | Real time bearing load sensing |
| CN1856699A (en) * | 2003-09-24 | 2006-11-01 | Skf股份公司 | Method and sensor arrangement for load measurement on rolling element bearing based on model deformation |
| CN1687728A (en) * | 2005-05-24 | 2005-10-26 | 浙江大学 | Method and device for measuring friction force of bearing under tiny load |
| CN101292090A (en) * | 2005-09-06 | 2008-10-22 | 蒂姆肯公司 | Load-sensing bearing |
| CN103292995A (en) * | 2013-05-28 | 2013-09-11 | 常州大学 | rolling bearing detection and fault diagnosis device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106441887A (en) | 2017-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106441887B (en) | The measurement method of contact load between a kind of turntable bearing rolling element and outer ring raceway | |
| CN102147320B (en) | Method and device for testing axial rigidity and radial rigidity of rotary hydrostatic guide rail | |
| CN107702681B (en) | Test device and method for simulating foundation settlement of large storage tank | |
| CN107314737B (en) | A kind of magnetic suspension rotor axial displacement radial measurement method | |
| CN101339000B (en) | Bearing contact angle and bump volume integrated detector | |
| CN204594625U (en) | A kind of high precision mass property force transfering device | |
| CN107015026A (en) | A kind of band incubator horizontal single quartz flexible accelerometer test table | |
| CN204788136U (en) | Quick detection device of inside and outside ring of mounting hole position degree on precise rotating platform bearing | |
| CN201297915Y (en) | Bearing contact angle and convex amount comprehensive measuring instrument | |
| CN205785012U (en) | A kind of bearing clearance detection device | |
| Chen et al. | Experimental study on contact force in a slewing bearing | |
| CN108225622A (en) | A kind of three-dimensional force sensor | |
| CN206248007U (en) | A kind of double half inner ring crossed roller bearing, four-point contact ball clearance detectors | |
| CN206234279U (en) | A kind of pre-tightening apparatus of bearing assembly and bearing | |
| CN108115549A (en) | The axial compressive force detecting system and method for ball-screw raceway face grinding device | |
| CN204007379U (en) | A kind of axle is flange opening and offset measuring device | |
| CN206095637U (en) | Contact deformation of turntable bearing measures laboratory bench | |
| CN206804149U (en) | A kind of piezoelectric vibration pickup for carrying magnetic support and preventing magnetic support from releasing | |
| CN104179912A (en) | Device for measuring ball movement state of ball screw pair | |
| CN206891887U (en) | Tangential fretting abrasion test device | |
| CN108151872A (en) | A kind of revolving support vibration detection device | |
| CN205262350U (en) | Super -huge turntable bearing wearing and tearing volume detection device | |
| CN108827510A (en) | The method for measuring revolute pair moment of friction | |
| CN108955458B (en) | Differential sphere diameter and runout measuring method and measuring device | |
| CN101886979B (en) | Device and method for measuring rigidity of hub bearings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |