CN106112698A - The method of non-pulling wheel lathe wheel processing front and rear profile circumference accuracy detection - Google Patents
The method of non-pulling wheel lathe wheel processing front and rear profile circumference accuracy detection Download PDFInfo
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- CN106112698A CN106112698A CN201610456848.4A CN201610456848A CN106112698A CN 106112698 A CN106112698 A CN 106112698A CN 201610456848 A CN201610456848 A CN 201610456848A CN 106112698 A CN106112698 A CN 106112698A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/20—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring workpiece characteristics, e.g. contour, dimension, hardness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
- B23B5/28—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning wheels or wheel sets or cranks thereon, i.e. wheel lathes
Abstract
The method that the invention discloses a kind of non-pulling wheel lathe wheel processing front and rear profile circumference accuracy detection, belong to numerically controlled lathe technical field, automatically detect measurement sensing device information processing system by rectangular coordinate, polar coordinate, order or three kinds of collection of illustrative plates forms of wave number and wheel Equivalent conicity by lathe and the precision state of train wheel processing front and back wheel profile circumference is shown by rectangular coordinate collection of illustrative plates, polar coordinate collection of illustrative plates, order or wave number collection of illustrative plates and Equivalent conicity；Solve existing non-pulling wheel lathe Railway wheelset processing front and back wheel profile circumference accuracy detection of not disintegrating to measure in the case of afunction, avoid causing train in high-speed overload travels owing to high-order polygon Equivalent conicity occurs in wheel contour circumference mistake circle thus causes Railway wheelset and track to produce ripple mill, the problem making the train bogie left train traffic safety hidden danger of generation resonance.
Description
Technical field
The present invention relates to numerically controlled lathe technical field, in particular to a kind of non-pulling wheel lathe wheel processing front and back wheel
The method of wide circumference accuracy detection.
Background technology
Along with the development of China railways, end 2014 the end of the year china railway revenue kilometres break through 11.2 ten thousand kilometers, Qi Zhonggao
The speed length of railroad lines in service, more than 1.6 ten thousand kilometers, is sure to occupy the first in the world, along with the realization of the high ferro operation mileage object of planning, high ferro
Becoming the main force of railway transport of passengers, China is also by high ferro society of marching toward comprehensively, and high ferro will on the impact of society's every aspect
Day by day notable, significant role will be played in daily life.The transportation safety of high-speed railway is most important, railroad train height Railway transportation
One of invention key being to ensure that bullet train, EMUs railroad train transportation safety of battalion's equipment Inspection new survey technique.
The detection measuring method of existing non-pulling wheel lathe wheel processing front and rear profile circumference precision, lacks train
Wheel is processed front and back carrying out detection and measures, and after processing, train wheel contour circumference state can not accurately detect measurement,
Railroad train and bullet train is caused to run the wheel of the running stability such as safety, riding quality and passenger's ride quality to processing
Can not get of detection special equipment ensures, take turns the grasp of geometric accuracy before and after processing is directly affected railroad train wheel rail relation and
Being related to train operating safety, according to processing, geometric accuracy is underproof takes turns operation, the operation of serious threat railroad train
Safety, the also life security of the serious threat people and national wealth safety.
According to shipping office of Chinese Railway head office (a fortune motor-car electricity [2015] 1834) " shipping office of Chinese Railway head office
The notice of bolt anticreep regulation is installed about CRH3C, CRH380B type EMUs axle head " the article pointed out, " early stage, CRH3C type moves
Car group, CRH380B type EMUs occur a lot of axle box end caps, ground connection lid to install bolt and get loose fault, and through investigation and analysis, wheel is deposited
The ripple mill wavelength existed at obvious 18 ~ 20 rank polygons and circuit individual segments is close with wheel polygon, EMUs fortune at a high speed
During row, the produce resonance close with wheel polygon Forced Frequency of circuit Forced Frequency, aggravation axle head vibration is to cause bolt to get loose
Basic reason." need to develop and more meet high ferro maintenance and use the motor car wheel numerical control that global function automatization is processed of needs not
Fall car wheel lathe, possesses the wheel that do not disintegrates on bullet train bogie and measures wheel to automatically controlling cutting profiling, automatically detection
To wheel footpath, inner side away from, tread profile, flange height, flange thickness, footpath leap function, increase Railway wheelset on the basis of Qr value and process
Global function automatic numerical control non-pulling wheel lathe is measured in the detection automatically of out-of-roundness high-order polygon and Equivalent conicity front and back, power-assisted I
The needs of state's Transportation Development, have the most great social meaning and economic benefit.
Summary of the invention
It is an object of the invention to provide a kind of non-pulling wheel lathe wheel processing front and rear profile circumference accuracy detection
Method provides geometric parameter accurately with the profile circumference precision being reached for before and after train wheel is processed, concrete to train
Correct judgement is made in operation, it is ensured that the purpose of train operating safety；Solve the existing non-pulling wheel lathe Railway wheelset that do not disintegrates to add
Work front and back wheel profile circumference accuracy detection measures afunction, causes train due to vehicle wheel in high-speed overload travels
Wide circumference is lost circle and is occurred that high-order polygon Equivalent conicity makes Railway wheelset and track produce ripple mill and train bogie occurs
Resonance, the problem causing train traffic safety hidden danger.
For realizing the object of the invention, the technical scheme of employing is: a kind of non-pulling wheel lathe wheel processing front and rear profile circumference
Circumference accuracy detection method, it is characterised in that include orthogonal X in lathe passage coordinate, Z-direction coordinate, processing wheel to,
Axle-box locating system, the knife rest being slidably arranged on lathe, automatic checkout system and information processing system, described knife rest sets
Having displacement transducer, displacement transducer to electrically connect with automatic checkout system, this method comprises the following steps:
A. processing wheel is assemblied on lathe by axle-box locating system, adjusts displacement transducer and in lathe passage coordinate
Determine X, Z-direction zero；
B. displacement transducer is moved to processing and take turns the wheel rim crown center position to both sides wheel and be set to starting point, to rise
The initial point continuous range measurement wheel in the wheel circumferential direction undulating value to wheel circular runout；
C. displacement transducer is moved along Z-direction, measure processing wheel to wheel rolling circle correspondence position on radial direction amount of change；
D. by displacement transducer along the Z-direction of lathe passage coordinate move to relevant position detect respectively processing wheel to processing before
After wheel rim circumference radially, wheel rolling round week radially and wheel tread circumference radial dimension and displacement transducer
The transverse shifting amount between location point is measured at each along Z-direction；
Wherein: the DATA REASONING process in step B, C, D has been controlled by automatic checkout system, and automatic checkout system collect
Feed back to information processing system after data and obtain corresponding wheel contour circumference state collection of illustrative plates.
Further, the zero of described step A is using any feeding starting point of the X-direction of lathe cutter saddle as lathe
X in passage coordinate is to zero, using processing wheel to left and right wheels wheel rim crown center position as in lathe passage coordinate
Z-direction zero.
Further, described information processing system includes the rear place of wheel out of round degree the poster processing soft and wheel Equivalent conicity
Reason software.
Further, described axle-box locating system uses axle-box locating mode driving wheel to rotate freely wheel around axis.
Further, institute's displacement sensors with processing wheel to detection periphery perpendicular contact.
Further, described step B will detect data by the mathematical transformation functions in wheel out of round degree the poster processing soft
Process obtains rectangular coordinate collection of illustrative plates and polar coordinate collection of illustrative plates.
Further, described step C is joined by the footpath leap function in wheel out of round degree the poster processing soft and Fourier transformation
Number obtains reflecting wheel high-order polygon state collection of illustrative plates.
Further, described step D is by the fourier function transformation equation in the poster processing soft of wheel Equivalent conicity
Carry out the Equivalent conicity ratio assessment before and after wheel processing.
Employing present invention have the advantage that
1. the present invention is automatically detected measurement and information processing system and train wheel is processed front and back wheel profile circumference by lathe
The concrete precision state of circumference reflects wheel contour circumference from different angles by rectangular coordinate collection of illustrative plates, polar coordinate collection of illustrative plates
State, reflect the wheel contour polygonal state of circumference circularity by order or wave number collection of illustrative plates and obtained by functional transformation
Assess to Equivalent conicity；
2. the accuracy detection using the wheel processing front and rear profile circumference of the present invention is various types of for EMU, railway
Type various model train, urban light rail train, subway train wheel to non-pulling wheel processing, it is ensured that the safe operation of train；
3. the present invention has filled up domestic and international existing non-pulling wheel lathe and Railway wheelset has been processed front and back wheel profile circumference precision
Dedicated test measures the blank of function, and the control for train wheel profile circumference precision is understood, it is to avoid train wheel profile circle
There is the train traffic safety hidden danger that high-order polygon and Equivalent conicity are caused in Zhou Zhouxiang, and makes the traffic safety of train be protected
Card has positive meaning.
Accompanying drawing explanation
Fig. 1 is the straight of the method for the non-pulling wheel lathe wheel processing front and rear profile circumference accuracy detection that the present invention provides
Angle coordinate system collection of illustrative plates；
Fig. 2 is the polar coordinate of the method for the non-pulling wheel lathe wheel processing front and rear profile circumference accuracy detection that the present invention provides
It it is collection of illustrative plates；
Fig. 3 is the wave number figure of the method for the non-pulling wheel lathe wheel processing front and rear profile circumference accuracy detection that the present invention provides
Spectrum；
Fig. 4 is the exponent number figure of the method for the non-pulling wheel lathe wheel processing front and rear profile circumference accuracy detection that the present invention provides
Spectrum；
Fig. 5 is the wheel etc. of the method for the non-pulling wheel lathe wheel processing front and rear profile circumference accuracy detection that the present invention provides
Effect taper measurement result schematic diagram；
Fig. 6 is the wheel etc. of the method for the non-pulling wheel lathe wheel processing front and rear profile circumference accuracy detection that the present invention provides
The foundation figure of the passage coordinate of effect tapering；
Fig. 7 is the cartwheel roll of the method for the non-pulling wheel lathe wheel processing front and rear profile circumference accuracy detection that the present invention provides
Dynamic circle position view.
Detailed description of the invention
Below by specific embodiment and combine accompanying drawing the present invention is described in further detail.
Before Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 and Fig. 7 illustrate the non-pulling wheel lathe wheel processing that the present invention provides
The analysis signal collection of illustrative plates of the method for rear profile circumference accuracy detection, the detection method of the present invention is by global function automatization
The numerical control non-pulling wheel lathe of processing realizes, and this lathe includes mechanical body structure, liquid gas pressure coupled system, driving means, holds
Row mechanism, automatic checkout system, information processing system, computer amplify passing interface technology with information process unit, conversion, can
For the wheel that do not disintegrates on railroad train bogie to the circumference out-of-roundness state after before processing, out-of-roundness high-order polygon
And Equivalent conicity detects the global function automatic numerical control non-pulling wheel lathe of measurement, automatically including phase in lathe passage coordinate
At the most vertical X, Z-direction coordinate, axle-box locating system, the knife rest being slidably arranged on lathe, automatic checkout system and information
Reason system, described knife rest is provided with displacement transducer, and displacement transducer electrically connects with automatic checkout system, and this method includes following
Step:
A. set up lathe passage coordinate, determine X, Z-direction zero by adjusting displacement transducer；Described zero is with machine
Any feeding starting point of the X-direction of bed knife rest, is taken turns left and right car with processing to zero as the X in lathe passage coordinate
Wheel rim crown center position is as the Z-direction zero in lathe passage coordinate；Numerical control non-pulling wheel is realized by Machine-Tool Control
X in lathe passage coordinate, Z-direction coordinate and workpiece line Vehicle Processing wheel to X, the most corresponding coincidence of Z-direction coordinate or parallel enter
Row location；Described lathe cutter saddle all feeds back to automatically examine in the displacement of X-direction coordinate and the detection data of displacement sensor
Examining system, automatic checkout system sends control information-driven lathe cutter saddle movement in X, Z-direction, it is ensured that displacement sensor begins
Eventually with take turns to contoured surface contact, complete follow-up Data Detection.
As shown in Figure 6, lathe left and right knife rest X to the O point of planker and O1 point be lathe passage coordinate X to zero, add
Work workpiece wheel is lathe passage coordinate Z-direction zero to O point and the O1 point at left and right wheels wheel rim top, and X, X1 coordinate axes hangs down
Directly form, in Z, Z1 coordinate axes, the flexible coordinate-system that machine tooling controls.
B. displacement transducer moves and takes turns the wheel rim crown center position to left and right wheels to processing is starting point, with initial
The undulating value of the point continuous range measurement wheel circular runout in wheel circumferential direction, obtains wheel by information processing system
Circumference state collection of illustrative plates, the wheel out of round degree the poster processing soft embedded in information processing system, by controlling knife rest top offset
The movement of sensor, the centre position of wheel rim is contacted by displacement transducer with wheel, remembers respectively during rotating at wheel
The undulating value of record wheel footpath jumping and displacement transducer, along wheel circumference to the distance of starting point, are obtained directly by mathematic(al) manipulation method
Angular coordinate collection of illustrative plates and polar coordinate collection of illustrative plates；
As it is shown in figure 1, Z-direction coordinate representation displacement transducer is along wheel circumference to the distance of starting point, its X is to coordinate representation wheel
The undulating value that footpath is jumped, reflection train wheel circularity space out-of-roundness smooth degree；
As in figure 2 it is shown, become corresponding angle, longitudinal coordinate to remain as the ripple that wheel footpath is jumped to Coordinate Conversion the X in step B
Dynamic value, the difference of the space circularity before and after the processing of Railway wheelset wheel can be formed a ring, make train car by polar collection of illustrative plates
The state of wheel circumference more visualizes.
C. displacement transducer moves in X direction, measures wheel to radial direction relative to standard wheels pair on rolling circle correspondence position
Amount of change, obtains wheel contour circumference out-of-roundness high-order polygon by information processing system, and described rolling circle refers to
Being the whole cross section rolling circle taking turns the middle position to wheel, rolling circle is positioned at takes turns on the tread circumference of wheel, in Fig. 7
Shown A point position；
As it is shown on figure 3, wheel contour circumference out-of-roundness high-order polygon detecting principle: automatic at numerical control non-pulling wheel lathe
Detecting system embeds wheel out of round degree the poster processing soft, size detection the original number of derived wheel out-of-roundness to standard wheels pair
According to, then to processing wheel to processing before and after detection data carry out wheel out of round degree high-order polygon detecting assessment；Wheel is many
Limit shape by radial direction amount of change corresponding to wheel rolling circle position with the function (i.e. " footpath leap function ") of phase place and Fourier transformation thereof
Parameter evaluate take turns to high-order polygon state, see in Fig. 3 wave number figure spectral representation train wheel processing before and after circumference
State is the corresponding wheel surface roughness in below 9 rank between-35～20 μm, and more than 9 rank corresponding surface roughness is-
Between 30～0 μm, thus reflect the distribution relation between wheel surface roughness and wheel out of round degree high-order polygon.
As shown in Figure 4, according to Railway wheelset profile circular order state before and after processing, soft by wheel out of round degree post processing
The wheel polygon situation that part obtains is respectively single order (eccentric), second order (oval), three rank (triangle), quadravalence (tetragon)
(being expressed as single order, second order, three rank, quadravalence by the mark 1,2,3,4 shown in Fig. 4) and the high-order that the rest may be inferred are polygon
Shape；The following process situation of train can process reparation polishing further according to the polygonal detection case of high-order, to prevent row
The high-order polygon of car produces resonance with track, causes the generation of train safe accident, and the polygon exponent number of Railway wheelset is the most,
Wheel to running in, be more prone to produce resonance situation.
D. moved to relevant position along the X-direction of lathe passage coordinate by displacement transducer and detect processing wheel respectively to adding
Wheel rim circumference radial dimension before and after work, wheel rolling round week radial dimension and wheel tread circumference radial dimension with
And displacement transducer along lathe passage coordinate X-direction each radial dimension measure location point transverse shifting amount (visualization
It is interpreted as constituting a tilted wiring being similar to tapering), by the circumference radial ruler little progress of transverse shifting amount He each location point
Row fourier function converts and obtains wheel Equivalent conicity ratio by information processing system and assesses；
The global function numerical control non-pulling wheel lathe that the present invention provides is processed the Cleaning Principle of front and back wheel Equivalent conicity: at lathe
Automatic checkout system in embed the poster processing soft of wheel Equivalent conicity, detection the initial data of derived wheel contours profiles
And the transverse shifting amount on the axial direction of wheel, the Equivalent conicity ratio of processing front and back wheel is estimated, detection
Measure assessment by measure the item in detail below geometric accuracy realize, Equivalent conicity correspond to industry standard wheel right≤5%, press
After setting processing template processing, the rim section of wheel, rolling circle part, tread portions profile radial dimension and setting template one
Cause, its flange thickness and Qr value and process between template profile to ratio error all within 0.2mm.
DATA REASONING process in step B, C, D has been controlled by automatic checkout system, and automatic checkout system is collected
Feed back to information processing system after data and obtain corresponding wheel contour circumference state collection of illustrative plates.
Described axle-box locating system uses axle-box locating mode to drive wheel to rotate freely around axle center, and automatic checkout system is adopted
With contact measurement method, lathe the axle-box locating system carried uses axle-box locating mode to ensure that in test process, wheel can
Rotating freely around axle center, the automatic checkout system displacement transducer of lathe contacts with analysis of wheel vertical, and sensor is followed wheel and rotated
From wheel rim to tread moving recording wheel tread shape profile information.
Institute's displacement sensors with processing wheel to detection periphery perpendicular contact, beneficially displacement transducer can detect
Go out processing wheel to radial direction amount of change in the X direction and wheel to wheel rim, rolling surface, the outline information of tread.
The process of detection data is obtained right angle by the mathematical transformation functions in wheel out of round degree the poster processing soft and sits by step B
Marking on a map and compose and polar coordinate collection of illustrative plates, two kinds of coordinate collection of illustrative plates can reflect the circumference out-of-roundness situation of wheel contour from different angles.
Step C obtains reflecting wheel by the footpath leap function in wheel out of round degree the poster processing soft and Fourier transformation parameter
High-order polygon state collection of illustrative plates, reflection processing wheel to contours profiles polygon state.
Before step D carries out wheel processing by the fourier function transformation equation in the poster processing soft of wheel Equivalent conicity
After Equivalent conicity ratio assessment, Equivalent conicity be evaluate wheel/rail contact geometric state important indicator.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (8)
1. the method for a non-pulling wheel lathe wheel processing front and rear profile circumference accuracy detection, it is characterised in that include machine
Bed passage coordinate in orthogonal X, Z-direction coordinate, processing wheel to, axle-box locating system, the knife rest being slidably arranged on lathe,
Automatic checkout system and information processing system, described knife rest is provided with displacement transducer, displacement transducer with automatically detect system
System electrical connection, this method comprises the following steps:
A. processing wheel is assemblied on lathe by axle-box locating system, adjusts displacement transducer and in lathe passage coordinate
Determine X, Z-direction zero；
B. displacement transducer is moved to processing and take turns the wheel rim crown center position to both sides wheel and be set to starting point, to rise
Initial point is along the undulating value taken turns the continuous range measurement wheel circular runout in wheel circumferential direction；
C. moved along Z-direction by displacement transducer, measure processing wheel to wheel rolling circle correspondence position on radial direction variation
Amount；
D. by displacement transducer along the Z-direction of lathe passage coordinate move to relevant position detect respectively processing wheel to processing before
After wheel rim circumference radially, wheel rolling round week radially and wheel tread circumference radial dimension and displacement transducer
The transverse shifting amount between location point is measured at each along Z-direction；
Wherein: the DATA REASONING process in step B, C, D has been controlled by automatic checkout system, and automatic checkout system collect
Feed back to information processing system after data and obtain corresponding wheel contour circumference state collection of illustrative plates.
The method of non-pulling wheel lathe wheel the most according to claim 1 processing front and rear profile circumference accuracy detection, its
Being characterised by, the zero of described step A is using any feeding starting point of the X-direction of lathe cutter saddle as lathe passage coordinate
In X to zero, using processing wheel to left and right wheels wheel rim crown center position as the Z-direction coordinate in lathe passage coordinate
Initial point.
The method of non-pulling wheel lathe wheel the most according to claim 1 processing front and rear profile circumference accuracy detection, its
Being characterised by, described automatic checkout system controls knife rest and moves to measure position；Described information processing system includes wheel out of round
Degree the poster processing soft and the poster processing soft of wheel Equivalent conicity.
The method of non-pulling wheel lathe wheel the most according to claim 1 processing front and rear profile circumference accuracy detection, its
Being characterised by, described axle-box locating system uses axle-box locating mode driving wheel to rotate freely wheel around axis.
The method of non-pulling wheel lathe wheel the most according to claim 1 processing front and rear profile circumference accuracy detection, its
Be characterised by, institute's displacement sensors with processing wheel to detection periphery perpendicular contact.
The method of non-pulling wheel lathe wheel the most according to claim 3 processing front and rear profile circumference accuracy detection, its
Being characterised by, the process of detection data is obtained by described step B by the mathematical transformation functions in wheel out of round degree the poster processing soft
The rectangular coordinate collection of illustrative plates of reflection wheel circumference circumference state and polar coordinate collection of illustrative plates.
The method of non-pulling wheel lathe wheel the most according to claim 3 processing front and rear profile circumference accuracy detection, its
Being characterised by, described step C is obtained instead by the footpath leap function in wheel out of round degree the poster processing soft and Fourier transformation parameter
Reflect wheel high-order polygon state collection of illustrative plates.
The method of non-pulling wheel lathe wheel the most according to claim 3 processing front and rear profile circumference accuracy detection, its
Being characterised by, described step D carries out wheel by the fourier function transformation equation in the poster processing soft of wheel Equivalent conicity
Equivalent conicity ratio is assessed.
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| CN107803521A (en) * | 2017-10-31 | 2018-03-16 | 广汉快速铁路设备有限公司 | Non-pulling wheel lathe coordinate pair answers the localization method of wheel |
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| CN109014246A (en) * | 2018-08-10 | 2018-12-18 | 安徽鼎恒再制造产业技术研究院有限公司 | A kind of impaired face remove device of train wheel |
| CN110610558A (en) * | 2019-09-16 | 2019-12-24 | 西南交通大学 | High-speed motor train unit wheel state analysis system and method thereof |
| CN112815895A (en) * | 2020-12-23 | 2021-05-18 | 中国铁路乌鲁木齐局集团有限公司科学技术研究所 | Wheel set size measuring device and wheel set size on-machine measuring method in rotary repair operation |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107803521A (en) * | 2017-10-31 | 2018-03-16 | 广汉快速铁路设备有限公司 | Non-pulling wheel lathe coordinate pair answers the localization method of wheel |
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| CN109014246A (en) * | 2018-08-10 | 2018-12-18 | 安徽鼎恒再制造产业技术研究院有限公司 | A kind of impaired face remove device of train wheel |
| CN110610558A (en) * | 2019-09-16 | 2019-12-24 | 西南交通大学 | High-speed motor train unit wheel state analysis system and method thereof |
| CN112815895A (en) * | 2020-12-23 | 2021-05-18 | 中国铁路乌鲁木齐局集团有限公司科学技术研究所 | Wheel set size measuring device and wheel set size on-machine measuring method in rotary repair operation |
| CN112991577A (en) * | 2021-02-25 | 2021-06-18 | 成都运达科技股份有限公司 | Railway vehicle wheel polygon state diagnostic system |
| CN112991577B (en) * | 2021-02-25 | 2022-08-02 | 成都运达科技股份有限公司 | Railway vehicle wheel polygon state diagnostic system |
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Application publication date: 20161116 |