SU734046A1 - Apparatus for rejecting rolling stock wheels - Google Patents

Description

(54) DEVICE FOR DISASSEMBLY OF WHEELS OF RAILING MOBILE COMPOSITION

I

The invention relates to the field of railway automatics, in particular, to systems for monitoring the technical condition (diagnostics) of wheels) of rolling stock pairs in motion.

A device for automatic rejection of rolling stock wheels 1, equipped with piezoelectric rail acceleration sensors on the control track and track axle counting sensors, a car gauge made on reversible binary axle counters, a switching device connected between a threshold device — amplitude discriminator of signals produced by acceleration sensors. and a memory unit controlled by wagon marker signals.

In the described device, the results of the screening of wheels with geometric irregularities in a circle of katani are influenced by the speed of the train.

The closest to the invention in its technical essence is a device 2, which contains axle count sensors and a rail vibration acceleration sensor connected to the axle count sensors of a gate generating unit, a rail acceleration accelerator amplifier and an amplitude discriminator.

Such a device allows for fault marking of wheels with isolated unevenness of Katani surfaces.

The purpose of the invention is to reduce the fault of wheel alignment with isolated irregularities of brake-rolled Katani surfaces.

The goal is achieved by the fact that the device is equipped with a rail acceleration pulse counter, the input of which is connected via a key to the output of the rail acceleration acceleration amplifier, and the output to the amplitude discriminator input 5, the second input of which is connected to the key and the input of the counter with the output of the gate forming unit.

A functional block diagram of the device 20 is shown in the drawing.

The device contains in the control area 1 the track, the length of which should be longer than the maximum base of the carriages (the center distance of the wheel pairs in the car), but less than the minimum base of two-axle cars or the distance between the trucks of rolling stock units, track sensors 2 I-2, axle counting . The distance between the sensors is equal to or slightly larger than the wheel circumference. Sensors 3i-3 are also installed on the test site; vibration accelerations of the rail, which are interconnected in parallel. Sensors 2 | -2 5 are connected to a gate forming unit 4, which is a physical indicator of rolling stock used in railway automation, controlling a gate trigger.

Sensors 3G-3 .; connected to the amplifier 5 pulses of acceleration rails, the output of which through the key 6, controlled from block 4, is connected to the counter 7 pulses of accelerations of the rails, also connected to block 4. The outputs of the key 6 and counter 7 are connected to the amplitude discriminator 8. At output 9 of the device rejection pulses of wheelsets appear, and at output 10, the passage mark pulses of physical units of the rolling stock, coming through the channel-forming equipment and communication lines, to recording station devices indicating the address of the defective coil forest couple in the train. The control track is usually selected on a stretch, at a distance from the auto-blocking input signal, ensuring timely re-routing to receive a train with defective wheels from the main to the side track. The functional part of the device is located in the distillery station control room for the technical condition of the rolling stock.

Acceleration sensors 3i-3.;, In which it is better to use piezoelectric accelerometers, are interconnected as voltage sources in parallel, and their common output is connected through amplifier 5 and electronic key 6 and the input of counter 7 of acceleration pulses of rails and to the main input of amplitude discriminator 8 with built-in analog-type memory elements. The output of counter 7 is connected to the second additional input of amplitude discriminator 8. Opening and closing of key 6 and interrogation of counter 7 are performed by gating pulses of block 4. If there are defects on the wheels of the controlled locomotive or car, the dimensions of which exceed the sizes allowed for this type of damage , then at the output 9 of the device there appear pulses of rejection of the wheel pairs, and at the exit 10 - the pulses of the passage mark of the physical units of the rolling stock coming through the channel-forming equipment and lines and links to recording station devices.

The device works as follows.

During movement along the control section 1 of the wheelset of a locomotive or carriage, block 4, using signals from track sensors 2 | -2j axle counting, generates gating pulses on each bogie (group of axles) passing in the zone between sensors 2. -2 j. These pulses from output 11, block 4, open key 6 for a while.

f - At-X- ff I -

.k - the length of the wheel control zone - the distance between the sensors 21I 2z;

Qtf- base truck car or locomotive;

V is the speed of the train. Pulse acceleration rails arising from the dynamic interaction of defective wheels with them, arrive through the key 6 open for the time t to the input of the ring binary counting 7 pulses of accelerations of the rails and to the main input of the amplitude discriminator 8. The amplitude of the maximum voltage pulse series is proportional to the acceleration of the rail; stored at time t by a memory element embedded in the amplitude discriminator. If on the surfaces of the wheel roll there are single irregularities such as spalling, vycherbin from the slide, then the number of acceleration pulses

5 rail B series, registered by the counter 7, will not exceed-ten. In this case, the filling of the counter 7 during the time t will not occur, and at its output a zero potential will remain. Therefore, at the time the last wheelset of a bogie or wagon leaves the

The control zone 0 by the signal from output 12 of block 4 will poll the memory cell and compare the voltage proportional to the maximum amplitude of rail accelerations, with the reference voltage of amplitude discriminator 8 corresponding to a single isolated irregularity of rejection dimensions, for example, 1.0 mm. After the passage of the last wheelset of the trolley (car) over the sensor 2 j, the key 6 is closed, and the counter 7 is reset.

 If there is a defect in the form of metal overlay (navara) on the wheels of the controlled trolley, then as a result of repeated collisions of the wheels with the rails, the input of the counter 7 during time t receives a sequence of more than 15 acceleration pulses of the rail. This will cause the counter to overflow and the negative control potential at its output, which will reduce the reference voltage and the threshold of amplitude discriminator 8 in a predetermined number of times. Thus, when the trolley with wheels on the wheels leaves the control zone, the amplitudes of proportional maximum ( Peak vibration acceleration values of the rail will be compared with a lower threshold, ensuring wheel pair rejection at an earlier stage of development of this dangerous defect, for example, at the magnitude of the weld, equal to 0.5 mm.

Claims (1)

Claim A device for sorting wheels of rail rolling stock, comprising a control section of the track, equipped with axle counting sensors and vibration acceleration sensors of the rail, a gate pulse generating unit, a rail acceleration pulse amplifier and an amplitude discriminator connected to the axle counting sensors, characterized in that, in order to reduce errors sorting of wheels with ⁵ irregularities of the riding surfaces of brake origin, it is equipped with a counter of impulses of rail accelerations, the input of which is through the key is dined with the output of the rail acceleration pulse amplifier, and the output is _{| 0} with the input of the amplitude discriminator, the second input of which is connected to the key, and the key control input and the input of the meter initial setup are connected to the output of the gate pulse generating unit.