CN106124177A - The monitoring method of roller rotation and monitoring system - Google Patents
The monitoring method of roller rotation and monitoring system Download PDFInfo
- Publication number
- CN106124177A CN106124177A CN201610494670.2A CN201610494670A CN106124177A CN 106124177 A CN106124177 A CN 106124177A CN 201610494670 A CN201610494670 A CN 201610494670A CN 106124177 A CN106124177 A CN 106124177A
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- shaft core
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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
- G01M13/00—Testing of machine 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
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The monitoring method and system that the present invention rotates about a kind of roller, the outer face that monitoring method comprises (A) roller shaft mandrel core arrange the first marked element, arrange the second marked element at the bearing face of roller；(B) bearing face using imaging apparatus axle center shaft core and tool the second marked element to having the first marked element images, to obtain the first image；(C) the first image is sent to treatment element to define its relational coordinate；(D) aforementioned relative coordinate is sent to computing element, with computed range value；(E) during roller rotates, abovementioned steps (B) is repeated to step (D), to obtain a plurality of distance value；(F) a plurality of distance values acquired by step (E) are carried out curve join suitable after obtain the coefficient of determination；And (G) monitoring coefficient of determination, the most abnormal to judge that roller rotates.The monitoring method and system that the roller of the present invention rotates, it is possible to provide instant and objective quantized values, improve the accuracy of detection.
Description
Technical field
The present invention be related to a kind of method and system monitoring roller, especially one can monitor roller rotate the most different
Normal method and system.
Background technology
In production technology now, volume to volume (Roll to Roll) technology because of have can produce the most in a large number, processing procedure letter
List and the advantage such as cost is relatively low, therefore it is widely used in each industry.In volume to volume technology, roller be necessary equipment it
One, also it is the Chief of impact production yield.Roller contains shaft core, bearing and sleeve, when shaft core or bearing break down
Time, roller can be caused to rotate and to have some setbacks, easily cause production abnormal phenomena and yield reduces.
In the past when detecting shaft core or the bearing of roller, major part is to utilize contact measurement, and it is divided into again artificial measurement
With measurement, artificial measurement is the most smooth and easy to judge that roller rotates for touching roller surface through experienced master worker,
But this kind of the most subjective and no quantization data of judgment mode, the most easily judge by accident.And measurement is through vibration analyzer or to listen
Examine device to measure, though Availability data, but need to be considered when use temperature, the humidity in environment and be during because of use equipment
No tool corrosive gas etc. easily causes the factor of damage equipment, and the accuracy of obtained data reduces.
Except above-mentioned utilize contact detection method in addition to, the another kind of method for prevention shaft core or bearing fault is periodically to protect
Support, the relevant spare part of such as periodic replacement.But, the difficulty of this kind of method is that cycle set is difficult to, too early renewal part meeting
Cause the waste of spare unit part, change too late and may cause producing extremely.
Therefore, whether aforementioned contact formula weight surveys roller, or uses time-based maintenance roller frequency, all has its shortcoming.Therefore
Need exist for a kind of method that can rotate with effective monitoring roller.
Summary of the invention
In view of this, one of present invention purpose, it is provided that a kind of monitoring method that roller rotates, the method is because using noncontact
Measurement mode, therefore measurement equipment can be avoided directly to be exposed to adverse circumstances and affect measurement, and can provide instant and objective
Quantized values.
The present invention provides a kind of monitoring method that roller rotates, and roller includes shaft core, sleeve and two bearings, and shaft core passes
Sleeve, these two bearings are sheathed on the two ends of shaft core respectively, and couple and sleeve, and monitoring method comprises the steps of (A) in rolling
Arranging the first marked element on the outer face of wheel shaft core, the end face in the bearing of first marked element the same side arranges the second sign
Element, the first marked element is the arbitrfary point beyond the center of circle of shaft core；(B) use imaging apparatus to having the first marked element
The end face of shaft core and the bearing with the second marked element carries out imaging to obtain the first image together；(C) the first image is passed
Deliver to treatment element with define the first marked element relative first coordinate for (Xm,Ym) and relative the second of the second marked element
Coordinate is (Xn,Yn)；(D) it is (X by relative first coordinatem,Ym) and relative second coordinate be (Xn,Yn) it is sent to computing element,
To calculate relative first marked element and the distance value between relative second marked element；(E) during roller persistently rotates, repeat
Carry out abovementioned steps (B) to step (D), to obtain a plurality of distance value；(F) by a plurality of distance values acquired by step (E)
Carry out curve according to following formula to join suitable (Curve fitting) and obtain the coefficient of determination (Coefficient of afterwards
Determination), formula be y (t)=a*Sin (t*2 π/p)+C, y be the corresponding each distance value of seasonal effect in time series, a is amplitude,
T is time series, and p is the cycle, and C is the distance value of start time point；And (G) monitoring coefficient of determination, to judge that roller rotates
The most abnormal.
According to one embodiment of the present invention, the step (D) in the monitoring method that roller rotates, distance value is via following
Formula calculates: [(Xn–Xm)2+(Yn–Ym)2]1/2。
According to one embodiment of the present invention, in the monitoring method that roller rotates, this bearing comprise the first swivel becket, the
Two swivel beckets and a plurality of rotating element are formed, and wherein the second swivel becket is arranged at the periphery of the first swivel becket, a plurality of turns
Dynamic element is arranged between the first swivel becket and the second swivel becket.
According to one embodiment of the present invention, in the monitoring method that roller rotates, wherein the second marked element is arranged at
Bearing the second swivel becket.
According to one embodiment of the present invention, in the monitoring method that roller rotates, wherein the second marked element is arranged at
Bearing the first swivel becket.
According to one embodiment of the present invention, in the step (G) of the monitoring method of roller rotation, when the coefficient of determination is less than
0.9, then judge that roller rotates abnormal.
According to one embodiment of the present invention, after the step (G) of the monitoring method of roller rotation, also include step
(H), when roller rotates judgement exception, warning element can send warning immediately.
The monitoring method that roller proposed by the invention rotates can perform by following monitoring system, and a kind of roller rotates
Monitoring system, this roller includes shaft core, two bearings and sleeve, and this shaft core passes this sleeve, and these two bearings are sheathed on respectively
The two ends of this shaft core, and it is coupled to this sleeve, it is characterised in that this monitoring system includes, the first marked element, and it is arranged at this
On the outer face of shaft core；Second marked element, on the end face of its this bearing being arranged at the same side with this first marked element；
Imaging apparatus, it is for having this shaft core of this first marked element and having this bearing of this second marked element and carry out
Shooting, to obtain the first image；Treatment element, it is coupled to this imaging apparatus, and this treatment element obtains in this first image
Relative first coordinate of this first marked element is (Xm,Ym) and relative second coordinate of this second marked element 160 be (Xn,
Yn)；Computing element, it is coupled to this treatment element, and this computing unit is used for calculating this first marked element and second indicates with this
Interelement distance value；Curve joins suitable element, and it is coupled to this computing element, and this curve joins suitable element for being entered by this distance value
Row curve join suitable after obtain the coefficient of determination；And monitoring element, it is coupled to this curve and joins suitable element, and this monitoring element is in order to supervise
The control coefficient of determination, the most abnormal to judge that this roller rotates.
According to one embodiment of the present invention, monitoring system also includes, warning element, and it is coupled to monitoring element, when sentencing
When determining roller rotation exception, this warning element can send alarm immediately.
According to one embodiment of the present invention, this imaging apparatus in this monitoring system, this treatment element, this Computing Meta
Part, this monitoring element and/or this warning element are arranged in transparent cabinet.
Compared with prior art, the method and system that monitoring roller proposed by the invention rotates, because belonging to non-contact measurement,
Therefore measurement equipment can be avoided to be directly exposed to badly detect environment affects measurement, and can provide instant and objectively measure
Change numerical value, therefore, can significantly improve the accuracy of testing result.
By the technical characteristic further illustrating the present invention and the effect reached, with preferred embodiment and coordinate detailed
After illustrating such as.
Accompanying drawing explanation
Fig. 1 illustrates the schematic side view of the roller according to one embodiment of the present invention.
Fig. 2 illustrates the monitoring method flow diagram rotated according to the roller of one embodiment of the present invention.
Detailed description of the invention
For the present invention aforementioned and other technology contents, feature and effect, know preferable reality in following cooperation with reference to graphic
Execute in the detailed description of example, can clearly present.
Refering to Fig. 1, it illustrates the schematic side view of roller of one embodiment of the present invention.
As it is shown in figure 1, the roller 100 that is suitable for of the present invention comprise shaft core 110, sleeve 140 and two bearings 120.Axle
Core 110 is through sleeve 140, and two bearings 120 are sheathed on the two ends of shaft core 110 respectively, and are coupled to sleeve 140.In the present invention
One or more preferred embodiments in, bearing 120 comprise first swivel becket the 121, second swivel becket 122 and a plurality of rotate unit
Part 123 is formed, and wherein, the second swivel becket 122 is arranged at the periphery of the first swivel becket 121, a plurality of rotating elements 123, example
Steel ball in this way, a plurality of rotating elements 123 are arranged between the first swivel becket 121 and the second swivel becket 122.
Refering to Fig. 2, the monitoring method flow diagram that its roller illustrating the present invention rotates.Simultaneously refering to Fig. 1 and Fig. 2.This
The monitoring method that bright disclosed roller rotates comprises the steps of
In the step s 21, the first marked element 150 is set on the outer face of the shaft core 110 of roller 100, in the first mark
Show that the end face of the bearing 120 of element 150 the same side arranges the second marked element 160.Wherein, the first marked element 150 is shaft core
Arbitrfary point beyond the center of circle of 110.
In one or more embodiment of the present invention, the second marked element 160 is arranged at the of the bearing 120 of roller 100
On two swivel beckets 122.
In one or more embodiment of the present invention, the second marked element 160 is arranged at the of the bearing 120 of roller 100
On one swivel becket 121.
In embodiments of the invention, the second marked element 160 is not limited to be arranged at the first swivel becket 121 or second turn
On rotating ring 122, and during only needing to be satisfied with roller 100 rotation, the second marked element 160 can be carried out with the first marked element 150
The condition moved relative to position.
In step S22, use imaging apparatus to having the shaft core 110 of the first marked element 150 and having the second sign
The end face of the bearing 120 of element 160 carries out imaging to obtain the first image together.This imaging apparatus can be such as Charged Couple unit
Part (Charge-Coupled Device, CCD) or CMOS (Complementary Metal-
Oxide-Semiconductor:CMOS) induction apparatus, but it is not limited to this.
In step S23, the first image is sent to treatment element and sits with define the first marked element 150 relative first
It is designated as (Xm,Ym) and relative second coordinate of the second marked element 160 be (Xn,Yn).This treatment element can be such as computer, but
It is not limited to this.
In step s 24, it is (X by relative first coordinatem,Ym) and relative second coordinate be (Xn,Yn) it is sent to Computing Meta
Part, computing element is to calculate relative first marked element 150 and the distance value between relative second marked element 160.This distance value
Such as can be calculated by following equation: [(Xn-Xm)2+(Yn-Ym)2]1/2, (Xm,Ym) it is that relative the first of the first marked element 150 is sat
Mark, (Xn,Yn) be relative second coordinate of the second marked element 160 be (Xn,Yn)。
In step s 25, during roller 100 persistently rotates, repeat abovementioned steps S22 to step S24, to obtain
A plurality of distance values.
In step S26, a plurality of distance values acquired by step S25 are carried out curve according to following formula and joins suitable (Curve
Fitting), after, to obtain the coefficient of determination (Coefficient of determination), formula is y (t)=a*Sin (t*2
π/p)+C, wherein, y is the corresponding each distance value of seasonal effect in time series, and a is amplitude, and t is time series, and p is the cycle, and C is initial time
The distance value of point.In a preferred embodiment of the present invention, the time series in roller 100 rotation refers to when roller 100 rotates
Each time point t=1, t=2, t=3 ... t=10 (second), bring a plurality of distance values of abovementioned steps into this formula, carry out
The curve of SIN function join suitable after, obtain the coefficient of determination.When the coefficient of determination more levels off to 1, represent roller and rotate normal.Otherwise,
When the coefficient of determination more levels off to 0, represent roller and rotate abnormal.
In step s 27, monitor the above-mentioned coefficient of determination, the most abnormal to judge that roller 100 rotates.In the present invention one
In preferred embodiment, when the coefficient of determination is less than 0.9, then judge that roller rotates abnormal.The setting of this coefficient of determination can preset,
Or adjust further according to the actual repair of testing staff, it is not limited to arbitrary ad hoc approach.
In another preferred embodiment of the present invention, after step S27, further provide for step S28, when judging that roller 100 rotates
Time abnormal, warning element can send warning immediately.
In the present invention, above-mentioned steps S22 is to step S28, corresponding to step A to step H.
The monitoring method that roller proposed by the invention rotates can perform by following monitoring system, but is not limited to this.
See also Fig. 1, below will be described in more detail.
Roller 100 rotate monitoring system, it include first marked element the 150, second marked element 160, imaging apparatus,
Treatment element, computing element and monitoring element.
First marked element 150, it is arranged at the outer face of shaft core 110 of roller 100.Second marked element 160, its
Being arranged at the end face of the bearing 120 of the same side of the first marked element, wherein the first marked element 150 is the center of circle of shaft core 110
Arbitrfary point in addition.In a preferred embodiment of the present invention, the second marked element 160 is arranged at the second rotation of bearing 120
On ring 122.In another preferred embodiment of the present invention, the second marked element 160 is arranged at the first swivel becket of bearing 120
On 121.
Imaging apparatus, it is in order to having the shaft core 110 of the first marked element 150, and has the second marked element 160
Bearing 120, carry out together imaging to obtain the first image.This imaging apparatus can be such as charge coupled cell (Charge-
Coupled Device, CCD) or CMOS (Complementary Metal-Oxide-
Semiconductor:CMOS) induction apparatus.
Treatment element, it is coupled to imaging apparatus, and when the first image is sent to treatment element, this treatment element i.e. defines
Relative first coordinate of the first marked element 150 in the first image is (Xm,Ym) and relative the second of the second marked element 160
Coordinate is (Xn,Yn).In a preferred embodiment of the present invention, treatment element can be such as computer.
Computing element, it is coupled to treatment element, when treatment element is by relative first coordinate of the first marked element 150
(Xm,Ym) and the relative second coordinate (X of the second marked element 160n,Yn) when being sent to computing element, this computing element i.e. calculates
The first marked element 150 in first image and the distance value between the second marked element 160.This distance value such as can be by following public affairs
Formula calculates, but is not limited to this:
Distance value=[(Xn-Xm)2+(Yn-Ym)2]1/2, (Xm,Ym) it is relative first coordinate of the first marked element, (Xn,
Yn) it is relative second coordinate of the second marked element.
Curve joins suitable element, and it is coupled to computing element, joins suitable in order to multiple distance values are carried out curve according to following formula
The rear acquirement coefficient of determination, formula be y (t)=a*Sin (t*2 π/p)+C, y be the corresponding each distance value of seasonal effect in time series, a is amplitude,
T is time series, and p is the cycle, and C is the distance value of start time point.When the acquired coefficient of determination more levels off to 1, represent rolling
Wheel 100 rotation is normal.When the acquired coefficient of determination more levels off to 0, represent that roller rotates abnormal.This curve joins suitable element can be interior
It is stored in computer program product, after computer is loaded into element and performs, a plurality of distance values can be carried out curved configuration, to obtain
The coefficient of determination.
Monitoring element, it is coupled to curve and joins suitable element, in order to monitor the coefficient of determination (Coefficient of
Determination), the most abnormal to judge that roller rotates.In a preferred embodiment of the present invention, when the coefficient of determination is less than
0.9, then judge that roller rotates abnormal.The setting of this coefficient of determination can preset according to the experience of testing staff, not with
Arbitrary ad hoc approach is limited.
Roller in another embodiment of the present invention rotates abnormal monitoring system, further comprises warning element,
It is coupled to monitoring element, and when judging that roller rotates abnormal, warning element can send alarm immediately.
Aforementioned roller rotate the imaging apparatus in abnormal monitoring system, treatment element, computing element, monitoring element and/
Or warning element, be optionally arranged in transparent casing, such as acryl case etc., with avoid measurement equipment by environment because of
The affected measurement of element, extends the service life of monitoring system.
From the above, the method that monitoring roller proposed by the invention rotates is because belonging to non-contact measurement, therefore can avoid measuring
Equipment is directly exposed to badly detect affects measurement in environment, and can provide instant and objective quantized values.
Although the present invention is disclosed above with preferred embodiment, so it is not limited to the present invention.Skill belonging to the present invention
Art field has usually intellectual, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Cause
This, protection scope of the present invention ought be defined depending on the right applied for a patent and is as the criterion.
Claims (10)
1. the monitoring method that roller rotates, this roller includes shaft core, sleeve and two bearings, and this shaft core passes this sleeve,
These two bearings are sheathed on the two ends of this shaft core respectively, and are coupled to this sleeve, it is characterised in that this monitoring method comprises following
Step:
Step A: arrange the first marked element on the outer face of this shaft core of this roller, in this first marked element the same side
The end face of this bearing arranges the second marked element, and this first marked element is the arbitrfary point beyond the center of circle of this shaft core；
Step B: use imaging apparatus to having this shaft core of the first marked element and having this bearing of second marked element
End face carries out imaging to obtain the first image together；
Step C: this first image is sent to treatment element, with define this first marked element relative first coordinate for (Xm,
Ym) and relative second coordinate of this second marked element be (Xn,Yn)；
Step D: by this relative first coordinate (Xm,Ym) and this relative second coordinate (Xn,Yn) it is sent to computing element, this Computing Meta
Part calculates the distance value between this first marked element and this second marked element；
Step E: during this roller persistently rotates, repeats step (B) to step (D), to obtain a plurality of distance value；
Step F: use curve join suitable element by these a plurality of distance values acquired by step (E) according to formula carry out curve join suitable after
Obtain the coefficient of determination, formula be y (t)=a*Sin (t*2 π/p)+C, y be correspondence seasonal effect in time series respectively this distance value, a is amplitude,
T is time series, and p is the cycle, and C is the distance value of start time point；And
Step G: use monitoring element is to monitor this coefficient of determination, and it is the most abnormal to judge that this roller rotates.
Monitor method the most as claimed in claim 1, it is characterised in that this imaging apparatus in this step (B) is Charged Couple
Element or CMOS induction apparatus.
Monitor method the most as claimed in claim 1, it is characterised in that this distance value in this step (D) is by public affairs calculated below
Formula gained:
Distance value=[(Xn-Xm)2+(Yn-Ym)2]1/2。
Monitor method the most as claimed in claim 1, it is characterised in that this coefficient of determination in this step (G) is less than 0.9, then
Judge that this roller rotates abnormal.
Monitor method the most as claimed in claim 1, it is characterised in that this bearing comprise the first swivel becket, the second swivel becket and
A plurality of rotating elements are formed, and wherein, this second swivel becket is arranged at the periphery of this first swivel becket, these a plurality of rotation units
Part is arranged between this first swivel becket and this second swivel becket.
Monitor method the most as claimed in claim 5, it is characterised in that this second marked element is arranged at second turn of this bearing
On rotating ring, or this second marked element is arranged on the first swivel becket of this bearing.
Monitor method the most as claimed in claim 1, it is characterised in that after step (G), further comprise step (H),
When this roller rotates abnormal, warning element can send warning immediately.
8. the monitoring system that roller rotates, this roller includes shaft core, sleeve and two bearings, and this shaft core passes this sleeve,
These two bearings are sheathed on the two ends of this shaft core respectively, and are coupled to this sleeve, it is characterised in that this monitoring system includes,
First marked element, it is arranged on the outer face of this shaft core；
Second marked element, on the end face of its this bearing being arranged at the same side with this first marked element；
Imaging apparatus, it is for having this shaft core of this first marked element and having this bearing of this second marked element
Image, to obtain the first image；
Treatment element, it is coupled to this imaging apparatus, and this treatment element obtains this first marked element in this first image
Relative first coordinate is (Xm,Ym) and relative second coordinate of this second marked element 160 be (Xn,Yn)；
Computing element, it is coupled to this treatment element, and this computing unit is used for calculating this first marked element and second indicates with this
Interelement distance value；
Curve joins suitable element, and it is coupled to this computing element, and this curve is joined suitable element and joined suitable for this distance value is carried out curve
The rear acquirement coefficient of determination；And
Monitoring element, it is coupled to this curve and joins suitable element, and this monitoring element is in order to monitor this coefficient of determination, to judge this roller
Rotate the most abnormal.
9. monitoring system as claimed in claim 8, it is characterised in that also including, warning element, it is coupled to monitoring element,
When judging that roller rotates abnormal, this warning element can send alarm immediately.
10. monitoring system as claimed in claim 9, it is characterised in that this imaging apparatus in this monitoring system, this processing elements
Part, this computing element, this monitoring element and/or this warning element are arranged in transparent cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610494670.2A CN106124177B (en) | 2016-06-29 | 2016-06-29 | The monitoring method and monitoring system of idler wheel rotation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610494670.2A CN106124177B (en) | 2016-06-29 | 2016-06-29 | The monitoring method and monitoring system of idler wheel rotation |
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| Publication Number | Publication Date |
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| CN106124177A true CN106124177A (en) | 2016-11-16 |
| CN106124177B CN106124177B (en) | 2018-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610494670.2A Active CN106124177B (en) | 2016-06-29 | 2016-06-29 | The monitoring method and monitoring system of idler wheel rotation |
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| JP2014178144A (en) * | 2013-03-13 | 2014-09-25 | Jtekt Corp | Behavior analysis method and behavior analysis device for component of bearing |
| CN104084669A (en) * | 2014-06-20 | 2014-10-08 | 河北工业大学 | Visual detecting method and device based on decoupling detection for circular seams |
| JP2015014588A (en) * | 2013-06-06 | 2015-01-22 | 株式会社ジェイテクト | Roller movement measuring device, roller movement measuring method, and roller movement measuring tool |
| CN104764440A (en) * | 2015-03-12 | 2015-07-08 | 大连理工大学 | Rolling object monocular pose measurement method based on color image |
| JP2016070907A (en) * | 2014-09-26 | 2016-05-09 | 株式会社ジェイテクト | Behavior measuring device of roller bearing and behavior measuring method |
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2016
- 2016-06-29 CN CN201610494670.2A patent/CN106124177B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2545591Y (en) * | 2002-05-27 | 2003-04-16 | 北京新联铁科贸有限公司 | High-accuracy planar array CCD automatic testing wheel set device |
| CN101608967A (en) * | 2008-06-18 | 2009-12-23 | 煤炭科学研究总院上海分院 | Comprehensive performance test device of electric roller |
| JP2014178144A (en) * | 2013-03-13 | 2014-09-25 | Jtekt Corp | Behavior analysis method and behavior analysis device for component of bearing |
| JP2015014588A (en) * | 2013-06-06 | 2015-01-22 | 株式会社ジェイテクト | Roller movement measuring device, roller movement measuring method, and roller movement measuring tool |
| CN104084669A (en) * | 2014-06-20 | 2014-10-08 | 河北工业大学 | Visual detecting method and device based on decoupling detection for circular seams |
| JP2016070907A (en) * | 2014-09-26 | 2016-05-09 | 株式会社ジェイテクト | Behavior measuring device of roller bearing and behavior measuring method |
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| Publication number | Publication date |
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| CN106124177B (en) | 2018-08-31 |
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