Method of monitoring parameters of wheelset and its position relative to rail track

FIELD: railway transport; measuring facilities.

SUBSTANCE: invention can be used automatic control of condition of wheelset and its position relative to rail track. According to proposed method of monitoring of wheelset parameters and its position relative to rail track, working surface of wheel is radiated by light and wheel profile and position of wheelset relative to rail track is determined basing on received radiation. Scattered radiation from points on irradiate working surface of wheel is used with measurement of coordinates of said points, and, using received coordinates, completed profile of wheel is formed which is compared with standard profile of wheelset. Basing on results of comparing decision is made on whether wheelset can be operated or should be rejected.

EFFECT: possibility of monitoring irrespective of condition of surfaces under checking.

4 dwg

 

The invention relates to the field of measurement technology and can be used for automated control of technical condition of wheel pair and its position relative to the track of the rolling stock of railway transport.

Currently, due to increased speed rail transport, on the one hand, and aging rolling stock on the other, the urgent task of objective control over the technical condition of railway rolling stock. One of the most loaded nodes of a railroad car, requiring constant monitoring, are a pair of wheels, changing their parameters during operation. Conducted periodic inspections of cars on the stations require considerable time, which significantly increases travel time. During the inspections there is an element of subjectivity, since the quality of the inspection depends on the qualifications of the inspector of carriages, the number of service personnel, etc. To exclude elements of subjectivity requires constant monitoring of the parameters of the pair of wheels at all times during their operation.

In addition, one of the most important parameters of the pair of wheels is its position relative to the track, which is almost not able to detect the Osma is tric cars.

There is a method of detecting defects on the surface of the wheel (see A.S. No. 1066866, CL 61 K 9/12), based on measuring the vertical acceleration of the rail. The known method allows you to make an assessment of the wheelset, mainly Slipknot wheel at speeds over 50 km/h, i.e. to identify the state of the wheel in which the further operation is impossible.

A known method of measuring the parameters of the rolling wheels of a railroad car (see RF patent №2153432, CL 61 K 9/12), based on the rolling wheel speed maneuvering outer edge of the rolling surface at a special steel plate and irradiated with this flat beam of light inside of the wheelset. Simultaneously with the irradiation produce the capture of the luminous wheel profile using the camera and after further processing of the obtained image on the computer, perform the visualization of the measured profile for the monitor.

The known method allows you to automate the process of measuring the parameters of rolling wheels, but it has two significant drawbacks.

First, to measure the use of a special installation, which mechanically holds the wheel on a steel plate, exciting only the outer part of the rolling surface. Therefore, the measurement process were is it on speed maneuvering cars, not in real operating conditions.

Secondly, the known method does not allow to significantly accelerate the time of inspection compared to the traditional way of examination of the composition of osmotrschiki, although superior to the latter in the degree of objectivity of the control.

The known method of control wheelset (DE No. 3611795, CL G 01 B 11/24, 11/14), lies in the lighting at the time of measuring the tread surface of the wheel during rotation, the registration of the photodetectors of the reflected light at specific points in the space and processing signals of the photodetectors. Light and scanning of the surface is produced by two sources: stationary point and scanning using the mirror drum sequence of points on the surface perpendicular to the direction of movement and registration of the reflected light is carried out using two groups of sensors located at fixed points in space relative to the axis of rotation of the wheel and at right angles to the running surface of the wheel.

There is a method allows to control the running surface of the wheel during movement of the carriage, but to obtain reproducible reliable values suitable for practical application, it is necessary to firmly fix the photodetectors relative activities is but the truck of the car. In fact, this method is suitable only for measuring the parameters of the wheelset specific cars, not all cars of a train.

In addition, the known method does not allow to measure the wheel flange, which considerably limits its capabilities.

The closest in technical essence to the claimed method (prototype) is a method of monitoring the geometric parameters of the wheelset and its spatial position relative to the path (see RF patent 2180300, CL 61 K 9/12, 2002), namely, that the wheel is irradiated by the light source and take a picture of the reflected light spots, set the emitters and photodetectors for the left and right wheels symmetrically with respect to the section of the route, together form a symmetrical light rays for the left and right wheels in horizontal and vertical planes with a number of parallel rays in each plane at least two, and mutual arrangement of the rays in the aggregates is determined by the size of the elementary conical surfaces and diameters of the wheels, modulate in-phase combination of the light rays for the left and right wheels, is irradiated with the working surface and the ridges of the left and right wheels, control the height of the beams above the rail heads transform spatial aggregate the received light p is ten in the information about the geometrical parameters of the individual fragments of the profiles of the left and right wheels, including the angle of taper of elementary surfaces, match fragments of the profiles according to instantaneous values of the height of the rays in the full profiles of the working surfaces of the wheels, identify pairs of in-phase light spots left and right wheels obtained from the symmetric light rays, converted to the same height, on a relative spatial displacement of the light spots in each pair taking into account the angle of the taper of the elementary surfaces, is judged on the geometric parameters of the wheelset and its spatial position relative to the path.

The main disadvantage of this method is the complexity of its technical implementation in the motion. This is due to the fact that the measurements of the wheels are produced by converting spatial aggregates the received light spots in the information about the geometrical parameters of the individual fragments of the profiles of the left and right wheels, a pair of separate fragments of the profiles according to instantaneous values of the height of the rays in the full profiles of the working surfaces of the wheels. To carry out these measurements, and restore the profile of the wheel is impossible in real time, and therefore, need special roads for monitoring parameters of wheel pairs.

In addition, in the known method of monitoring shall receive reflected suc is of light spots. It is known that the reflected light depends on the surface reflectivity. If the surface reflectance is dirty, then the reflected signal will be almost absent. It is necessary to take into account the fact that to receive the reflected signal in a strictly specified location. The change in the slope of the reflective surface (the output of the wheel) will lead to the deviation of the reflected light spot.

The aim of the present invention is to remedy these disadvantages, namely the monitoring parameters wheelset and its position relative to the track when the motion in real time not depending on the state of the controlled surfaces.

The objective in the way of monitoring parameters wheelset and its position relative to the track, is that irradiate the surface fragments on the outer part of the wheel by light radiation, admit radiation from the irradiated surface fragments wheels and restore the shape of the wheels and the position of the pair of wheels relative to the track, is achieved by the fact that additionally produce the irradiation surface fragments on the inner part of the wheel pair, the illuminated fragments wheels use linear profile of the wheel at a predetermined height from the rail is on the way, and taken from the irradiated fragments wheels scattered radiation restore a complete profile of each of the wheels, compare these profiles with known profiles of the reference wheel pair and by comparing the results conclude the possibility of further operation of the pair of wheels.

The specified execution method, you can restore the profile of the working surface of the wheel due to the direct measurement of its external and internal profiles regardless of the speed of the wheel, while receiving scattered radiation from the irradiated fragments wheels allows you to simplify the process of reception of the reflected signal and does not depend on the degree of contamination of the test surface, and a comparison of the current measured values of the profile wheel with reference values, allows you to make an unambiguous conclusion about the suitability of this wheel to further operation.

A full profile of each of the wheels can be restored by spatially combining the inner and outer profiles of the wheel that allows you to get an objective picture of its current state.

The irradiation process of the internal and external portions of a surface of each of the wheels and receiving scattered radiation from the irradiated fragments may be at least two optical rangefinders, one of motoriduttore outside the track, and the other inside the track. Knowing the binding of each of the finders to the rail tracks, it is easy to perform the operation based on the combination of inner and outer profiles of the wheel.

To conclude the possibility of further operation of the pair of wheels possible after the imposition of the measured profile of the inner or outer surface of the wheels on the reference profile, and the deviation of the measured wheel profile from the reference should not in any segment of the profile to exceed the control value.

The position of the pair of wheels relative to the track can be determined by applying the same type of wheel profiles on each other, and the magnitude of the lateral displacement of one of the profiles it is possible to conclude about the delay of one of the wheel pair.

The inventive method of monitoring parameters of the wheelset and its position relative to the track allows you to objectively monitor the parameters of the pair of wheels when driving on the track in real time, which has no analogues in the measuring equipment used on railway transport, and therefore meets the criterion of "inventive step".

Figure 1 presents the scheme of realization of the proposed method.

Figure 2 presents a drawing explaining the principle of forming the wheel profile.

Figure 3 presents the re is the super shot graph of the profile of the inner surface of the wheel.

Figure 4 presents real shot chart profile of the outer surface of the wheel.

The scheme of realization of the proposed method (see figure 1)includes: wheel pair 1 with wheels 2, which is on track 3; an optical finder 4 to the outer side of the wheel with the scanning beam 5, the optical rangefinder 6 to the inner side of the wheel with the scan beam 7; the processing unit 8 connected to the computer 9. The device operates as follows.

When driving on the track wheelset 1 enters the field of view of optical rangefinders 4 and 6, whose light rays 5 and 7 scan the external and internal profile of the wheel 1 (see figure 2). Optical rangefinder 6, the scanning beam 7, generates the current Y coordinate1the inner surface of the wheel 2, and an optical finder 4, a scanning beam 5 forms the current Y coordinate2its outer surface. The signal from the optical range finder 6 is used as a reference signal required to bind the origin of the optical finder 4, since the inner surface of the wheel is selected as the base surface to determine the coordinates of its external profile. Before the beginning of the measurements produce the alignment optical rangefinders, i.e. produce precise determination of the coordinates of X0(the distance between the optical rangefinders is 4 and 6), want to contribute as the source coordinates in the processing unit 8. Before measuring the current coordinates for each of the wheels of the composition of the block 8 by the signal magnetic pedal (figure 1 it is not shown) receives a signal to switch the optical rangefinders. The signals from the optical rangefinders 4 and 6 in the form of a set of current coordinates of the scanned surfaces of the wheels arrive at the processing unit 8, where they form a complete surface profile of the wheel (see figure 3 and 4). After the definition of these profiles, they are compared with reference signals and make a mark about their condition. This comparison of the received and reference profiles without additional measurements allows to obtain information about the position of the pair of wheels relative to the track. To do this, compare the initial coordinates of the wheels, for example, Y1right wheel with Y1the left wheel. If one of the obtained profiles "ahead" of the other, then there is an element of the skew axis 1.

The obtained profiles of the wheels with marks on their technical condition indicating the number of staff with specific indication of the number of car and wheels go on the computer 9 (infobase Railways). Repair crews nearest service station wagons on the basis of the received information identifies indicated the data wheel and perform necessary maintenance.

As an optical rangefinder measurements were used certified laser rangefinder brand "Labrake", working on the principle of triangulation meter distance with a valid measurement error distance of 0.2 mm

Conducted full-scale tests of the model of the device that implements the inventive method, fully confirmed its efficiency and applicability for monitoring parameters of the rolling stock wheel pairs and their relative position to the track.

Method of monitoring parameters of the wheelset and its position relative to the track, which is irradiated by light radiation the surface of the wheel and on the adopted emission determine the profile of the wheel and the position of the pair of wheels relative to the track, characterized in that the quality of the received radiation use diffuse radiation from points on the exposed working surface of the wheel, measure the coordinates of these points and the computed coordinates form the finished wheel profile, which is compared with a reference profile of the wheel, and by comparing the results conclude the possibility of further operation of the pair of wheels.



 

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