阅读说明：本技术 一种轨道车辆轮饼参数在线测量装置及方法 (Online measuring device and method for wheel cake parameters of railway vehicle ) 是由 赵若群 于 2021-07-27 设计创作，主要内容包括：本发明公开了一种轨道车辆轮饼参数在线测量装置,包括安装于轨道内侧的第一2D激光位移传感器、安装于轨道外侧的包括第二2D激光位移传感器、第三2D激光位移传感器、第四2D激光位移传感器的一组2D激光位移传感器和安装于轨道外侧的包括第一测速装置、第二测速装置和第三测试装置的一组测速装置；第一2D激光位移传感器、第二2D激光位移传感器、第三2D激光位移传感器、第四2D激光位移传感器和所述第一测速装置、第二测速装置和第三测试装置均通过信号线连接轮饼测量系统,经过位置布置,结合算法,能够快速、精确测量轨道车辆轮饼参数；较之传统测量方法,具有结构简单、成本低廉、快速精确等特点。(The invention discloses an online measuring device for wheel cake parameters of a railway vehicle, which comprises a first 2D laser displacement sensor arranged on the inner side of a track, a group of 2D laser displacement sensors which are arranged on the outer side of the track and comprise a second 2D laser displacement sensor, a third 2D laser displacement sensor and a fourth 2D laser displacement sensor, and a group of speed measuring devices which are arranged on the outer side of the track and comprise a first speed measuring device, a second speed measuring device and a third testing device, wherein the first 2D laser displacement sensor is arranged on the inner side of the track; the first 2D laser displacement sensor, the second 2D laser displacement sensor, the third 2D laser displacement sensor, the fourth 2D laser displacement sensor, the first speed measuring device, the second speed measuring device and the third testing device are all connected with a wheel cake measuring system through signal lines, and by means of position arrangement and combination of an algorithm, wheel cake parameters of the rail vehicle can be measured quickly and accurately; compared with the traditional measuring method, the method has the characteristics of simple structure, low cost, rapidness, accuracy and the like.)

1. The utility model provides a rail vehicle wheel cake parameter on-line measuring device which characterized in that: the device comprises a first 2D laser displacement sensor (1) arranged on the inner side of a track, a group of 2D laser displacement sensors which are arranged on the outer side of the track and comprise a second 2D laser displacement sensor (2), a third 2D laser displacement sensor (3) and a fourth 2D laser displacement sensor (4), and a group of speed measuring devices which are arranged on the outer side of the track and comprise a first speed measuring device (5), a second speed measuring device (6) and a third testing device (7);

the first 2D laser displacement sensor (1) is used for measuring the positions of the top point and the back of the wheel rim;

the second 2D laser displacement sensor (2), the third 2D laser displacement sensor (3) and the fourth 2D laser displacement sensor (4) are used for measuring and collecting wheel cake tread curve data;

the first speed measuring device (5), the second speed measuring device (6) and the third testing device (7) are used for measuring the speed and the acceleration;

the first 2D laser displacement sensor (1), the second 2D laser displacement sensor (2), the third 2D laser displacement sensor (3), the fourth 2D laser displacement sensor (4) and the first speed measuring device (5), the second speed measuring device (6) and the third testing device (7) are all connected with the wheel cake measuring system through signal lines.

2. The on-line measuring device for the parameters of the wheel cake of the railway vehicle as claimed in claim 1, wherein: what is needed isThe laser emission plane of the first 2D laser displacement sensor (1) is in a vertical plane vertical to the rail direction, and the laser emission center line of the first 2D laser displacement sensor forms an included angle a with the inner end face of the wheel cake₁The first 2D laser displacement sensor (1), the second 2D laser displacement sensor (2), the third 2D laser displacement sensor (3) and the fourth 2D laser displacement sensor (4) are fixedly arranged on the same support, and the relative spatial positions are fixed.

3. The on-line measuring device for the parameters of the wheel cake of the railway vehicle as claimed in claim 2, wherein: the laser emission plane A of second 2D laser displacement sensor (2), third 2D laser displacement sensor (3), fourth 2D laser displacement sensor (4) and perpendicular to rail to perpendicular plane B's contained angle be an, the laser central line of second 2D laser displacement sensor (2), third 2D laser displacement sensor (3), fourth 2D laser displacement sensor (4) and the contained angle that is on a parallel with orbital perpendicular plane C are beta.

4. A rail vehicle wheel cake parameter online measurement method is characterized in that: the specific measurement method of the online measurement device for the parameters of the wheel cake of the railway vehicle as claimed in claim 3 is as follows:

the method comprises the following steps: mounting of an on-line measuring device

The method comprises the following steps that a first 2D laser displacement sensor (1) is installed on the inner side of a track through a support, a second 2D laser displacement sensor (2), a third 2D laser displacement sensor (3) and a fourth 2D laser displacement sensor (4) are installed on the outer side of the track, and a first speed measuring device (5), a second speed measuring device (6) and a third testing device (7) are installed on the outer side of the track;

step two: speed and acceleration acquisition

Calculating to obtain speed and acceleration through the time when the wheel cake rolls through the first speed measuring device (5), the second speed measuring device (6) and the third testing device (7) and the distance between the first speed measuring device (5), the second speed measuring device (6) and the third testing device (7), and obtaining the speed value at any moment in the measuring process according to the speed and the acceleration;

step three: obtaining wheel cake tread curve

a) When the wheel cake rolls and passes through the second 2D laser displacement sensor (2), the third 2D laser displacement sensor (3) and the fourth 2D laser displacement sensor (4), three groups of data of multiple wheel cake treads at different moments are obtained through measurement;

b) obtaining a plurality of wheel cake tread curves at different moments by coordinate conversion and curve fitting of the data obtained in the step a);

step four: obtaining characteristic value of wheel cake tread curve

Calculating the obtained wheel cake tread curve according to the railway industry standard to obtain the data of the height of the wheel flange, the thickness of the wheel flange, the Qr value and the width of the wheel rim;

step five: obtaining the diameter of the rolling circle of the wheel cake

a) When the wheel cake rolls through the first 2D laser displacement sensor (1), measuring to obtain a plurality of curves at different moments, carrying out coordinate transformation and mathematical fitting on each curve, and finding the top point P of the wheel rim by combining speed parameters at all moments_0、P_1、……P_i；

b) To the edge vertex P_0、P_1、……P_iPerforming circle fitting on the data to obtain the diameter D1 of the circle where the rim vertex is located;

c) if the diameter of the rolling circle is D and the height of the wheel rim is SH, then: D-D1-2 SH

Step six: obtaining out-of-roundness of wheel cake

The second 2D laser displacement sensor (2), the third 2D laser displacement sensor (3) and the fourth 2D laser displacement sensor (4) are arranged at different positions, so that diameter values of three different areas on the circumference of the wheel cake can be obtained, and out-of-roundness of the wheel cake is calculated;

step seven: obtaining of inner side distance and equivalent taper

The distance between the first 2D laser displacement sensors (1) in the tracks on the two sides is calibrated to obtain the inner side distance of the wheel pair, and then the equivalent taper is calculated according to the standard of the railway industry;

step eight: perfecting data management application functions

The method comprises the following steps of (1) recording the date, the number, the axial position and the wheel number of a vehicle by combining a vehicle number identification device;

function 2, can calculate the diameter difference of the same axle, with the diameter difference of the bogie, with the diameter difference of the car, through inputting the threshold value, realize the alarm of the out-of-tolerance;

function 3, by inputting the wheel rim height, the wheel rim thickness, the Qr value, the rolling circle diameter, the out-of-roundness, the inner side distance, the equivalent taper and other threshold values, the out-of-tolerance alarm is realized;

function 4, through the measurement of a certain time, can calculate the speed and trend of wearing and tearing, predict and wear out the time of the out-of-tolerance, guide the maintenance work of the wheel cake;

function 5, can interface with vehicle section management system, realize the data sharing, bring the wheel cake measuring system into the vehicle section management system;

function 6, printout.

5. The on-line measuring method for the parameters of the wheel cake of the railway vehicle as claimed in claim 4, wherein the method comprises the following steps: and a plurality of groups of 2D laser displacement sensors are arranged on the outer side of the track to obtain diameter values of more areas on the circumference of the wheel cake, so that the out-of-roundness calculation is more accurate.

6. The on-line measuring method for the parameters of the wheel cake of the railway vehicle as claimed in claim 4, wherein the method comprises the following steps: the 2D laser displacement sensors with the directions opposite to those of the second 2D laser displacement sensor (2), the third 2D laser displacement sensor (3) and the fourth 2D laser displacement sensor (4) are arranged on the outer side of the track so as to adapt to a vehicle provided with a sanding pipe.

7. The on-line measuring method for the parameters of the wheel cake of the railway vehicle as claimed in claim 4, wherein the method comprises the following steps: and a plurality of groups of speed measuring devices are arranged on the outer side of the track to adapt to more complex vehicle speed change.

Technical Field

The invention relates to the technical field of online measurement of wheel cake parameters of railway vehicles, in particular to an online measurement device and method for wheel cake parameters of railway vehicles.

Background

The wheelset is an extremely important component of the vehicle running part, and is responsible for transmitting the force between the wheelset and the rail as well as bearing the entire weight of the vehicle body. The wheel set has great importance for the safe operation of the train, accurately measures parameters such as the rim thickness, the rim height, the vertical abrasion, the tread abrasion, the wheel diameter and the like of the wheel, ensures that the shape parameters of the tread of the wheel of the train and the diameter difference of the left wheel and the right wheel of the same shaft meet relevant regulations and standards, and is very important for ensuring the safe operation of the train and smoothly completing a transportation plan.

However, the existing wheel pair detection device mainly comprises a fourth checker and a wheel pair ruler, and the detection tool needs manual reading, so that errors are easy to occur, and the detection reliability is influenced; in addition, the running speed of the train is measured by the means in the prior art, and the precision of the train is difficult to meet the measurement requirement, so that a large error of a measurement result is caused.

The invention aims to solve the technical problem of how to improve the measurement precision of the wheel and the precision of out-of-roundness of the wheel based on the prior art CN 109443264B.

Therefore, it is necessary to invent an online measuring device and method for wheel cake parameters of a railway vehicle to solve the above problems.

Disclosure of Invention

In order to solve the technical defect in the prior art, the online measuring device for the wheel cake parameters of the rail vehicle comprises a first 2D laser displacement sensor arranged on the inner side of a rail, a group of 2D laser displacement sensors which are arranged on the outer side of the rail and comprise a second 2D laser displacement sensor, a third 2D laser displacement sensor and a fourth 2D laser displacement sensor, and a group of speed measuring devices which are arranged on the outer side of the rail and comprise a first speed measuring device, a second speed measuring device and a third testing device;

further, the first 2D laser displacement sensor is used for measuring the positions of the top point and the back of the wheel rim;

further, the second 2D laser displacement sensor, the third 2D laser displacement sensor and the fourth 2D laser displacement sensor are used for measuring and collecting wheel cake tread curve data;

furthermore, the first speed measuring device, the second speed measuring device and the third testing device are used for measuring the vehicle speed and the acceleration;

further, the first 2D laser displacement sensor, the second 2D laser displacement sensor, the third 2D laser displacement sensor, the fourth 2D laser displacement sensor, the first speed measuring device, the second speed measuring device and the third testing device are all connected with a wheel cake measuring system through signal lines;

furthermore, the laser emission plane of the first 2D laser displacement sensor is in a vertical plane perpendicular to the rail direction, and the laser emission center line of the first 2D laser displacement sensor forms an included angle a with the inner end face of the wheel cake₁And the first 2D laser displacement sensor, the second 2D laser displacement sensor, the third 2D laser displacement sensor and the fourth 2D laser displacement sensor are fixedly arranged on the same support, and the relative spatial positions are fixed.

Furthermore, the included angle between the laser emission plane a of the second 2D laser displacement sensor, the third 2D laser displacement sensor and the fourth 2D laser displacement sensor and the perpendicular plane B perpendicular to the rail direction is a, and the included angle between the laser center line of the second 2D laser displacement sensor, the third 2D laser displacement sensor and the fourth 2D laser displacement sensor and the perpendicular plane C parallel to the rail direction is β.

A rail vehicle wheel cake parameter online measurement method comprises the following specific measurement method:

the method comprises the following steps: mounting of an on-line measuring device

The method comprises the following steps that a first 2D laser displacement sensor is installed on the inner side of a track through a support, a second 2D laser displacement sensor, a third 2D laser displacement sensor and a fourth 2D laser displacement sensor are installed on the outer side of the track, and a first speed measuring device, a second speed measuring device and a third testing device are installed on the outer side of the track;

step two: speed and acceleration acquisition

Calculating to obtain speed and acceleration according to the time when the wheel cake rolls over the first speed measuring device, the second speed measuring device and the third testing device and the distance between the first speed measuring device, the second speed measuring device and the third testing device, and obtaining the speed value at any moment in the measuring process according to the speed and the acceleration;

step three: obtaining wheel cake tread curve

a) Measuring to obtain three groups of data of multiple wheel cake treads at different moments when the wheel cake rolls through the second 2D laser displacement sensor, the third 2D laser displacement sensor and the fourth 2D laser displacement sensor;

b) obtaining a plurality of wheel cake tread curves at different moments by coordinate conversion and curve fitting of the data obtained in the step a);

step four: obtaining characteristic value of wheel cake tread curve

Calculating the obtained wheel cake tread curve according to the railway industry standard to obtain the data of the height of the wheel flange, the thickness of the wheel flange, the Qr value and the width of the wheel rim;

step five: obtaining the diameter of the rolling circle of the wheel cake

a) When the wheel cake rolls through the first 2D laser displacement sensor, a plurality of curves at different moments are obtained through measurement, coordinate transformation and mathematical fitting are carried out on each curve, and the wheel rim vertex P is found through combination of speed parameters at all the moments₀、P₁、........P_i；

b) To the edge vertex P₀、P₁、........P_iPerforming circle fitting on the data to obtain the diameter D1 of the circle where the rim vertex is located;

c) if the diameter of the rolling circle is D and the height of the wheel rim is SH, then: D-D1-2 SH

Step six: obtaining out-of-roundness of wheel cake

The second 2D laser displacement sensor, the third 2D laser displacement sensor and the fourth 2D laser displacement sensor are arranged at different positions, so that diameter values of three different areas on the circumference of the wheel cake can be obtained, and out-of-roundness of the wheel cake can be calculated;

step seven: obtaining of inner side distance and equivalent taper

The distance between the first 2D laser displacement sensors (1) in the tracks on the two sides is calibrated to obtain the inner side distance of the wheel pair, and then the equivalent taper is calculated according to the standard of the railway industry;

step eight: perfecting data management application functions

The method comprises the following steps of (1) recording the date, the number, the axial position and the wheel number of a vehicle by combining a vehicle number identification device;

function 2, can calculate the diameter difference of the same axle, with the diameter difference of the bogie, with the diameter difference of the car, through inputting the threshold value, realize the alarm of the out-of-tolerance;

function 3, by inputting the wheel rim height, the wheel rim thickness, the Qr value, the rolling circle diameter, the out-of-roundness, the inner side distance, the equivalent taper and other threshold values, the out-of-tolerance alarm is realized;

function 4, through the measurement of a certain time, can calculate the speed and trend of wearing and tearing, predict and wear out the time of the out-of-tolerance, guide the maintenance work of the wheel cake;

function 5, can interface with vehicle section management system, realize the data sharing, bring the wheel cake measuring system into the vehicle section management system;

function 6, printout.

Furthermore, a plurality of groups of 2D laser displacement sensors are arranged on the outer side of the track to obtain diameter values of more areas on the circumference of the wheel cake, so that out-of-roundness calculation is more accurate.

Furthermore, 2D laser displacement sensors with the directions opposite to those of the second 2D laser displacement sensor, the third 2D laser displacement sensor and the fourth 2D laser displacement sensor are arranged on the outer side of the track so as to adapt to vehicles provided with sanding pipes.

Furthermore, a plurality of groups of speed measuring devices are arranged on the outer side of the track to adapt to more complex vehicle speed changes.

In summary, the beneficial effects of the invention include:

1. the method has the advantages that the four 2D laser displacement sensors are utilized, the parameters of the wheel cake of the railway vehicle can be measured quickly and accurately through position arrangement and algorithm combination, the measurement precision is high, the conditions of abrasion and the like of the wheel cake of the railway vehicle can be calculated accurately and quickly by establishing a coordinate system, acquiring a wheel cake tread curve characteristic value, acquiring a wheel cake rolling circle diameter, acquiring an inner side distance and equivalent taper and perfecting a data management application function, the data can be directly printed and viewed, and the method is direct and clear and is convenient to use; the fewer sensors, the fewer error sources and the higher measurement precision; the invention uses the least number of sensors to completely realize the measurement function; the invention can realize the function of measuring the diameter with high precision without measuring the running speed of the train;

2. the wheel cake measuring system is combined with a car number identification device, records the date, the number, the axial position and the number of a car, can calculate the coaxial diameter difference, the diameter difference with a bogie and the diameter difference with the car, realizes out-of-tolerance alarm by inputting threshold values, realizes out-of-tolerance alarm by inputting the threshold values of the height of a wheel rim, the thickness of the wheel rim, a Qr value, the diameter of a rolling circle, the inner side distance, the equivalent taper and the like, can calculate the wear speed and trend by measuring for a certain time, predicts the wear out-of-tolerance time, guides the maintenance work of the wheel cake, can be connected with a vehicle section management system, realizes data sharing, brings the wheel cake measuring system into the vehicle section management system, and can print output data;

3. the measuring device can be arranged on a T-shaped rail and a groove-shaped rail, and is suitable for freight railway vehicles, passenger railway vehicles, subway vehicles and urban rail vehicles.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of an on-line measuring device according to the present invention;

FIG. 2 is a schematic structural diagram of an on-line measuring device according to the present invention;

FIG. 3 is a schematic view of a calculated out-of-roundness region at the periphery of a wheel disc in accordance with the present invention;

FIG. 4 is a schematic diagram of the wheel rim vertices P0, P1, … … Pi of the present invention in a coordinate system.

In the figure: first 2D laser displacement sensor 1, install in track outside including second 2D laser displacement sensor 2, third 2D laser displacement sensor 3, fourth 2D laser displacement sensor 4, first speed sensor 5, second speed sensor 6 and third testing arrangement 7.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The first embodiment is as follows: referring to fig. 1-4, the online measuring device for wheel cake parameters of a railway vehicle provided by the invention comprises a first 2D laser displacement sensor 1 installed on the inner side of a track, a group of 2D laser displacement sensors installed on the outer side of the track and including a second 2D laser displacement sensor 2, a third 2D laser displacement sensor 3 and a fourth 2D laser displacement sensor 4, and a group of speed measuring devices installed on the outer side of the track and including a first speed measuring device 5, a second speed measuring device 6 and a third testing device 7;

further, the first 2D laser displacement sensor 1 is used for measuring the positions of the top point and the back of the wheel rim;

further, the second 2D laser displacement sensor 2, the third 2D laser displacement sensor 3 and the fourth 2D laser displacement sensor 4 are used for measuring and collecting wheel cake tread curve data;

further, the first speed measuring device 5, the second speed measuring device 6 and the third testing device 7 are used for measuring the speed and the acceleration;

further, the first 2D laser displacement sensor 1, the second 2D laser displacement sensor 2, the third 2D laser displacement sensor 3, the fourth 2D laser displacement sensor 4, the first speed measuring device 5, the second speed measuring device 6 and the third testing device 7 are all connected with the wheel cake measuring system through signal lines;

furthermore, the laser emission plane of the first 2D laser displacement sensor 1 is in a vertical plane perpendicular to the rail direction, and the laser emission center line of the first 2D laser displacement sensor forms an included angle a with the inner end face of the wheel cake₁The first 2D laser displacement sensor 1, the second 2D laser displacement sensor 2, the third 2D laser displacement sensor 3 and the fourth 2D laser displacement sensor 4 are fixedly arranged on the same support, and the relative spatial positions are fixed.

Furthermore, the included angle between the laser emission plane a of the second 2D laser displacement sensor 2, the third 2D laser displacement sensor 3 and the fourth 2D laser displacement sensor 4 and the perpendicular plane B perpendicular to the rail direction is a, and the included angle between the laser center line of the second 2D laser displacement sensor 2, the third 2D laser displacement sensor 3 and the fourth 2D laser displacement sensor 4 and the perpendicular plane C parallel to the rail direction is β.

A rail vehicle wheel cake parameter online measurement method comprises the following specific measurement method:

the method comprises the following steps: mounting of an on-line measuring device

The method comprises the following steps that a first 2D laser displacement sensor 1 is installed on the inner side of a track through a support, a second 2D laser displacement sensor 2, a third 2D laser displacement sensor 3 and a fourth 2D laser displacement sensor 4 are installed on the outer side of the track, and a first speed measuring device 5, a second speed measuring device 6 and a third testing device 7 are installed on the outer side of the track;

step two: speed and acceleration acquisition

Calculating to obtain speed and acceleration according to the time when the wheel cake rolls through the first speed measuring device 5, the second speed measuring device 6 and the third testing device 7 and the distance between the first speed measuring device 5, the second speed measuring device 6 and the third testing device 7, and obtaining the speed value at any moment in the measuring process according to the speed and the acceleration;

step three: obtaining wheel cake tread curve

a. When the wheel cake rolls and passes through the second 2D laser displacement sensor 2, the third 2D laser displacement sensor 3 and the fourth 2D laser displacement sensor 4, three groups of data of multiple wheel cake treads at different moments are obtained through measurement;

each 2D laser displacement sensor

b. Carrying out coordinate conversion and curve fitting on the data obtained in the step a) to obtain a plurality of wheel cake tread curves at different moments;

specifically, for each 2D laser displacement sensor, calculating the height of a wheel rim according to the standard of the railway industry for each wheel cake tread curve at different moments, selecting three curves with the minimum height of the wheel rim, and carrying out average processing on the three curves to obtain a wheel cake tread curve;

in the step a, three groups of 2D laser displacement sensors are arranged, three groups of wheel cake tread curves obtained through the processing in the step b can be obtained, and then the average value of the three groups of wheel cake tread curves is obtained, namely the final wheel cake tread curve. The object is to improve further improvement of the measurement of the wheel accuracy.

Step four: obtaining characteristic value of wheel cake tread curve

Calculating the obtained wheel cake tread curve according to the railway industry standard to obtain the data of the height of the wheel flange, the thickness of the wheel flange, the Qr value and the width of the wheel rim;

step five: obtaining the diameter of the rolling circle of the wheel cake

a. When the wheel cake rolls through the first 2D laser displacement sensor 1, a plurality of curves at different moments are obtained through measurement, coordinate transformation and mathematical fitting are carried out on each curve, and the wheel rim vertex P is found through combination of speed parameters at all the moments₀、P₁、........P_i；

b. To rim vertex P₀、P₁、........P_iPerforming circle fitting on the data to obtain the diameter D1 of the circle where the rim vertex is located;

c. if the diameter of the rolling circle is D and the height of the wheel rim is SH, then: D-D1-2 SH

Step six: obtaining out-of-roundness of wheel cake

The second 2D laser displacement sensor 2, the third 2D laser displacement sensor 3 and the fourth 2D laser displacement sensor 4 are arranged at different positions, so that diameter values of three different areas on the circumference of the wheel cake can be obtained, and out-of-roundness of the wheel cake can be calculated;

step seven: obtaining of inner side distance and equivalent taper

The distance between the first 2D laser displacement sensors (1) in the tracks on the two sides is calibrated to obtain the inner side distance of the wheel pair, and then the equivalent taper is calculated according to the standard of the railway industry;

step eight: perfecting data management application functions

The method comprises the following steps of (1) recording the date, the number, the axial position and the wheel number of a vehicle by combining a vehicle number identification device;

function 2, can calculate the diameter difference of the same axle, with the diameter difference of the bogie, with the diameter difference of the car, through inputting the threshold value, realize the alarm of the out-of-tolerance;

function 3, by inputting the wheel rim height, the wheel rim thickness, the Qr value, the rolling circle diameter, the out-of-roundness, the inner side distance, the equivalent taper and other threshold values, the out-of-tolerance alarm is realized;

function 4, through the measurement of a certain time, can calculate the speed and trend of wearing and tearing, predict and wear out the time of the out-of-tolerance, guide the maintenance work of the wheel cake;

function 5, can interface with vehicle section management system, realize the data sharing, bring the wheel cake measuring system into the vehicle section management system;

function 6, printout.

Furthermore, a plurality of groups of 2D laser displacement sensors are arranged on the outer side of the track to obtain diameter values of more areas on the circumference of the wheel cake, so that out-of-roundness calculation is more accurate.

Further, 2D laser displacement sensors with the directions opposite to those of the second 2D laser displacement sensor 2, the third 2D laser displacement sensor 3 and the fourth 2D laser displacement sensor 4 are arranged on the outer side of the track so as to adapt to vehicles provided with the sanding pipes.

Furthermore, a plurality of groups of speed measuring devices are arranged on the outer side of the track to adapt to more complex vehicle speed changes.

In conclusion, the method has the advantages that the four 2D laser displacement sensors are utilized, the parameters of the wheel cake of the railway vehicle can be rapidly and accurately measured by position arrangement and an algorithm, the measurement precision is high, and the conditions of abrasion of the wheel cake of the railway vehicle and the like can be accurately and rapidly calculated by establishing a coordinate system, acquiring a wheel cake tread curve, acquiring a characteristic value of the wheel cake tread curve, acquiring the diameter of a wheel cake rolling circle, acquiring an inner side distance and equivalent taper and perfecting a data management application function.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.