Device for diagnostic checking of geometric parameters of rail vehicle wheelsets

FIELD: railway transport; auxiliary equipment.

SUBSTANCE: invention relates to device for checking condition of wheelsets of rail vehicles. proposed device contains optical measuring unit including optical measuring sensor made in form of laser focused radiation source 1 and optically mated linear radiation receiver 6 and also signal electronic processing unit. Device is furnished with prechamber 3 with nozzle 4 located before source of laser radiation coaxially with source and compressed air supply system connected with prechamber.

EFFECT: enlarged operating capabilities of device in contaminated atmospheres.

1 dwg

 

The invention relates to the field of measurement technology and can be used to control the technical condition of the wheelsets of rail rolling stock.

Currently being developed and implemented automated system for laser control state wheelset cars on the railroad. They are based on processing of the scanned signals of the laser radiation from the wheel in real time during the passage of a train past the device.

Such systems include devices located near the railroad tracks. The light signal from the wheel carriage to the photodetector passes a certain distance, and transmits information about the parameters of the pair of wheels. At the same time, the air wave accompanying a passing train, raises dust. Rain and snow can also form a two-phase two-component mixture near a passing train, distorting the sensor readings.

The scattering of laser radiation is amplified by the crystals of snow dust and rain, obstructs and hinders accurate information retrieval and further processing of the signal. The question arises about the clean channel passing laser radiation in adverse conditions, dusty atmosphere, which solves this invention.

Known automated measurement parameters stake is different pairs of rolling stock in motion (Venediktov AS, Demkin, VN, Docks DS. Measurement parameters wheelset rolling stock in motion// Railroad of the world. - 2003, No. 9), comprising a laser, a photodetector, the measuring sensors evenly at a distance of 1/4 of the circumference of the wheel on both sides of the rail. The principle of this sensor is a laser triangulation. Wheel when driving crosses the beam of laser radiation. When this occurs, the scanning beam of the wheel rim. The image of the spot of radiation on the surface through the lens is projected onto the line of the linear photosensor. The position of the spot on the ruler corresponds to the distance from the sensor to a certain point of the rim. The movement of the wheel during the measurement due to the inertia of the train is considered uniform. The speed is determined using the induction sensor number of axles. At a known distance from the running surface of the wheel rim to the sensor and the speed of the computer is calculated profile and other parameters of the wheel.

The disadvantage of this device is the distortion of the read information when the device is in the polluted atmosphere, when due to the resulting two-phase mixture (air/rain drops or small particles of snow) signal is scattered by the dispersed phase.

Closest to the claimed invention is a complex diagnostic controlability pairs of rolling stock on a utility model certificate of the Russian Federation No. 28348 (publ. 20.03.2003).

This complex diagnostic control wheelset rolling stock for a utility model certificate of the Russian Federation No. 28348 (publ. 20.03.2003) contains optical measuring unit including a light source and a photodetector, and the block of electronic signal processing, and the complex entered the position sensor of the pair of wheels connected to the electronic unit of the signal processing, and optical measuring unit is made in the form of a system of optical sensors located on or inside the track and connected to the electronic unit of the signal processing, as well as optical sensors used, for example, measuring linear distances. The optical measuring sensor used triangulation sensor, made in the form of a laser focused radiation source and optically it is associated with the linear radiation detector.

The disadvantage of this complex and the diagnostic method of control implemented by the complex, is the shortness of its use in dusty and snow-covered environment, formed by the air wave accompanying the train when it is in motion or during precipitation.

The task of the invention is to enhance the operation of the device in the polluted atmosphere generated by moving the left or natural precipitation, increase the reliability and efficiency of diagnosing the condition of the wheels of the train in the process of their movement.

To achieve the mentioned technical result is a device that contains an optical measuring unit including an optical measuring sensor, made in the form of a laser focused radiation source and optically it is associated with the linear radiation detector, and the electronic unit of the signal processing. In contrast to the known proposed device is provided with a settling chamber with a nozzle, located in front of the laser light source coaxially with it, and the supply of compressed air associated with the settling chamber.

These characteristics have been identified in other technical solutions in the study of the level of the art and, therefore, the decision is novel and involves an inventive step.

The drawing shows the proposed device is the horizontal projection, the view from the top.

The proposed device for the diagnosis of geometrical parameters wheelset contains a laser focused radiation source 1, a transparent window 2, the prechamber 3 supersonic nozzle 4, the supply of compressed air 5, providing a supercritical pressure drop in the critical section of a supersonic nozzle, linear receivers emission is 6, the electronic unit signal processing (not shown), the wheel 7, the geometric parameters of which are controlled, the rail 8.

The device operates as follows. For supersonic nozzle 4 with the selected diameter dimension of the critical section on the gear cylinders or compressors set the required excess of the threshold pressure of the air in the prechamber 3 nozzle 4. The signal from the sensor before the collisions of railway wheel 7 on the area of the laser spot fires valve air flow in the settling chamber 3 and the nozzle 4. This supersonic jet air flow cleans the channel (path) passing the laser radiation from the particles of the discrete phase to the diagnosed wheel surface 7 of the rolling stock. After a certain time interval Δτ the laser beam is directed into the settling chamber 3 and the nozzle 4 through the transparent window 2, located along the axis of the pre-chamber 3, and influence them during the time of the passage of the wheels 7. During the movement of the wheel 7 along the rail 8 signal light diagnosed from the surface of the wheel 7 is assumed to be linear light receiver 6 with the subsequent processing of the received signals and passes the data to the block of electronic signal processing. Supersonic jet stream off after diagnosis wheels. Then the process is repeated during the time of the passage just jelly is accessible structure.

This device allows the most efficient use of supersonic jet stream to implement the smooth passage of the laser radiation under adverse environmental conditions.

Thus, the task of the expansion device in the polluted atmosphere, increasing the reliability and efficiency of diagnostics of wheel pairs of rolling trains during its movement through the use of a supersonic jet of air flow is solved by the claimed invention.

The diagnostic control device geometric parameters of the rolling stock wheel pairs containing the optical measuring unit including an optical measuring sensor, made in the form of a laser focused radiation source and optically it is associated with the linear radiation detector, and the electronic unit of the signal processing, wherein the device is provided with a settling chamber with a nozzle, located in front of the laser light source coaxially with it, and the supply of compressed air associated with the settling chamber.



 

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FIELD: transport engineering; rail vehicles.

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EFFECT: improved reliability, enlarged functional capabilities.

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7 dwg

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