SU474450A1 - Device for determining the sequence of moving objects - Google Patents

Description

one

The invention relates to railway automation, IB in particular to devices for monitoring the movement of mobile units in railway transport, intended primarily for use in reversible counters of rolling stock axes operating with regard to the direction of movement and can be used, for example, to monitor the movement of railway vehicles. and turnouts, for determining the axle of cars, the detection of long-base cars and other purposes.

Devices are known for detecting the tracing of moving objects, comprising two located on the path of movement with a common sensor range, connected with a counter through a pulse shaper.

In these devices, the sensors are installed with a certain displacement between themselves along the path of movement so that the zones of action of the sensors partially overlap and form a common zone of action. This ensures the operation of the device both during the through passage and when the direction of movement of the object is changed, for example, during maneuvers.

However, in such devices, changing the coverage areas may interfere with their overlap and cause the meter to fail.

The purpose of the invention is to increase the reliability of pulse counting.

2

This is achieved by the fact that the pulse shaper is made on the "OR and" NOT gates, the delay elements and the trigger. In this way, the output from each sensor is connected to the logical element OR or indirectly, and through the logical element NOT, the trigger and the delay element, the output of the logical element OR OR associated with the first sensor is connected to the inhibitory input of the delay element and the zero input of the trigger related to the second sensor.

FIG. 1 shows a functional diagram of the proposed device; in fig. 2 is a diagram of the sensors triggering when the overlapping of the application zones fails; in fig. 3 is a diagram with a directed pulse train.

Two sensors located on the path with a common area of operation (in the drawing

not shown), connected to inputs 1 and 2 of the pulse generator and connected to the inputs 3 of logic elements 4 and 5 "OR directly with inputs 6 through the logic elements 7" NOT, triggers 8, 9 and elements 10 and 11 of the delay.

The output of a logic element 4 or 5 "OR, related to one of the sensors, is connected to the inhibitory input 12 of the delay element and the zero input of the trigger, related to

another sensor.

The proposed device works as follows.

In the initial state, there are no signals at inputs 1 and 2 of the pulse driver, triggers 8 and 9 are in position A, delay elements 10 and 11 are not excited, therefore signals at elements 4 and 5 "OR, and consequently, at outputs 13 and 14 no.

If the passage of a moving object causes impulses of insufficient duration (see Fig. 2), then the necessary elongation of the first pulse is provided as follows.

When the first sensor is triggered (moment i), a signal appears at input 1 of the driver and input 3 of the OR element, as a result of which a signal is output at output 13. This signal acts on the pulse counter, and also through the capacitor 15 sets trigger 8 to B. As a result, a delay element 10 is excited and a signal is provided at the input 6 of the OR element.

Then the moving object leaves the zone of the first sensor and the signal at input 1 disappears (moment 2) - Element 7 does NOT trigger 8 return to its original state, however delay element 10 remains for some time (up to 1 second) excited. This element supports the signal at the input 6 of the element “OR, and hence at the output 13 of the device.

Thus, the pulse of the first sensor is lengthened.

The moving object then enters the range of another sensor, therefore, at input 2, a signal appears which is transmitted through element 5 "OR to output 14 (moment 4). However, the trigger 9 is not transferred, since the signal from output 13 still acts at its zero input. Since the output from signal 14 is sent to the inhibitory input 12 of delay element 10, this element stops and output signal 13 is removed (time 4). Since during the time t t4-tz the signals were on both output 13 and output 14, the imposition of pulses will be restored and the meter malfunction will be eliminated.

When a signal from output 13 is removed, the polarity of the pulse through the capacitor 15 will be inverse than at time ti, therefore, the trigger 8 is not transferred.

Next, the moving object leaves the range of the other sensor, the signal at input 2 disappears (time fj) Since flip-flop 9 remains in the zero state, delay element 11 is not excited, so the signal from output 14 is removed without delay at time t.

Thus, the pulse of another sensor is not lengthened, the total duration of the two pulses does not increase, as a result of which the speed of the device is not reduced.

The movement of the object in the opposite direction will trigger the elements in reverse order, and in the event of overlapping, the impulse of another sensor will be extended.

If the imposition of pulses is normal, then

no lengthening will occur as

the action of elements 10 and 11 of the delay will be

prohibited signals from outputs 14 and 13, respectively.

Subject invention

A device for determining the tracing of moving objects, containing two motion sensors with a common sensor area, connected with a counter through a driver and pulses, characterized in that, in order to increase the reliability of the pulse counting, the driver of pulses is made on logical elements "OR and" NOT, delay elements and a trigger, while the output from each sensor is connected to the logical element "OR directly and through the logical element" PE, trigger and delay element, the output of the logical element The “OR” relative to the first sensor is connected to the inhibiting input

delay element and zero trigger input related to the second sensor.

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