SU1076927A1 - Device for counting items moving in two opposite directions - Google Patents

Abstract

I WILL DEVELOP TO COUNTING ITEMS ,. MOVING IN TWO OPPOSITE DIRECTIONS, containing two sensors, the outputs of each of which are connected to the input of the corresponding pulse generator and inverter, five elements And, the outputs of each inverter are connected to the first input of the Corresponding element; that And, the output of the second element And connected to the first input elements OR, triggers, direct output of the first trigger; the trigger is connected to the first input of the fifth element AND, the third impulse generator and the delay element, characterized in that, in order to improve the accuracy, That element, And, the third inverter and the third trigger. the outputs of the first and second sensors are connected to the second inputs of the second and first elements And, respectively, the output of the first pulse shaper is connected to the first inputs of the first and second triggers, “the output of the second pulse shaper is connected to the second input of the first trigger and the first input of the third trigger, the second input of which connected to the second input of the second trigger and to the output of the third element And, the output of the element OR through the third pulse generator connected to the first input of the fourth element And, the second and t The rety inputs of which are connected to the inverse outputs of the second and third flip-flops, respectively, the inverse output of the first flip-flop connected to the first input of the sixth element And, the second input of which and the second input of the fifth element And are connected and connected to the output of the fourth element And, which is connected to the input The third inverter, the output of which is through, the delay element is connected to the first input of the third element I, the second of which is connected to the input of the device. a G) ND

Description

The invention relates to technical means of information systems and can be used to increase noise immunity and expand the field of application of devices for determining the direction of motion and counting the number of objects times a personal configuration and the width or groups of objects moving in two opposite directions. A device for counting objects is known, which contains sensors for connected to: a block of threshold elements, a trigger connected to a switch and a block of elements AND, and counters fl.

The disadvantages of this device are low accuracy and reliability of the device.

Closest to the present invention is a device for counting objects moving in two opposite directions, containing two sensors, outputs of each of. which are connected to the input of the corresponding pulse generator and inverter, five AND elements, outputs of the inverter terminal are connected to the first input of the corresponding AND element, the output of the second AND element is connected to the first input of the OR element, triggers, and the first output of the first trigger the element And, the third pulse shaper and the delay element, the drivers are connected with the corresponding elements And 2,

A disadvantage of the known device is the impossibility of counting moving objects with a width less than the distance between the points of sight of the sensors, which limits its use for counting moving objects of arbitrary width.

The purpose of the invention is to improve the accuracy of the device.

The goal is achieved by the fact that in a device containing two sensors, the outputs of each of which are connected to the input of the corresponding impedance forwarder and inverter, five And elements, the outputs of each inverter are connected to the first input of the corresponding element And, the output of the second element And connected to the first element input OR trigger, direct output of the first epi trigger, connected to the nepBHLM input of the fifth element AND, the third pulse generator and delay element j, the sixth AND element, the third inverter and the third trigger, outputs are entered ervogo and second sensors are connected to second inputs of first and second AND gates, respectively, vyhoy first pulse shaper connected to the first inputs of the first and second flip-flops, a second pulse shaper output is connected ;; to the Bl-dpo iy input of the first trigger and to the first input of the third trigger, the second input of which coejftiHeH with the second, open input of the second trigger and with the output of the third element And, the output of the element OR through the third driver of the pulses is connected to the first input of the fourth element And, the second and third inputs of which are connected to the inverse outputs of the second and third triggers, respectively, the inverse output of the first trigger connected to the first input of the sixth

5 And elements, the second input of which and the second input of the 5th element AND are combined and connected to the output of the fourth element And that is connected to the input of the third inverter.

0 the output of which through the delay element is connected to the first input of the third element And, the second input of which is connected to the input of the device,

five

The sensors can be used. Any motion sensors with a discrete output, such as photoelectric, contact, inductive.

0

The distance between the points of sight of the sensors does not depend on the width of the object, and when passing objects of a complex configuration or group of objects through the control zone, it must be greater than the width of the gaps in the object or the distance between the objects, respectively.

The drawing shows the functional diagram of the device

The device consists of sensors 1 and 2, inverters 3-5, elements AND 6-11, formers 12-14 pulses, triggers 16-17, the element OR 18, the element 19 delay.

In the initial state, determined by the absence of an object in the zone of control of sensors 1 and 2 and impulse Reset O to zero inputs of flip-flops 16 and 17 through element 8, at the outputs of sensors 1 and 2 and formers 12 and 13 signal 1, the position of the trigger 15 is arbitrary, at the zero outputs of the flip-flops 16 and 17, the signal is O, elements 6 and 7 are blocked by the absence of signals at the outputs of inverters 3 and 4, the element OR 18 by the absence of signals at the outputs of elements 6 and 7, the driver 14 pulses, the output of which is a signal O - the lack of a sydna During the element-1 SI 18, the inverter 5 and the elements 11 and 10 and the absence of signal at the output of AND element 9,

Impulse Reset can feed C into the device only once before its operation begins. In all other cases, the input of the element And 8 during operation of the device from the power source (not shown) receives a signal 1.

Depending on the direction of movement of the object and its width in relation to the distance between the points of sight of sensors 1 and 2, the signals O from their outputs may appear in the following sequence.

When the object moves conditionally Forward.

11,01,11,10,11 - object width is less than the distance between the points of sight of the sensors;

11.01.00.10.11 - the width of the object is larger than the distance between the points of sight of the sensors.

When moving an object conditionally back.

j; 11,10,11,01,11 - the width of the object is less than the distance between the points of sight of the sensors,

11.10.00.01.11 - the width of the object is greater than the distance between the sight points of the sensors.

Consider the case of an object moving Forward when its width is less than the distance between the points of sight of the sensors. At the same time, sensor 1 is first triggered and the output signal C-eto arrives at the first input of the element I 7 and at the input of the inverter 3 and at the input of the driver 12, which issues a short pulse O which sets the triggers 15 and 16 to the zero state. At the same time, signal 1 from the output of inversTopa 3 unlocks the element AND b /:: the output of which signal 1 through the element OR 18 causes the appearance of a pulse 1 at the output of the driver 14, i.e. At the first input of the element And 9, blocked by the signal O from the trigger output 17. When an object enters the zone between the Sighting points of the sensors, sensor 1 releases, which leads to blocking of the elements And b and 7 and formers 12-14, i.e. the established previous state of the device circuit does not change.

Upon further advancement of the Forward object, sensor 2 is triggered, which causes the appearance at the exit of the imaging unit 13 of the pulse O, which throws the triggers 15 and 17, respectively, in the one and zero state. In this moment

from the inverter output

signal

4, the element 7 is unblocked, and the signal 1 from its output through the element OR 18 causes (a pulse 1 appears at the output of the shaper 14, which through the unlocked elements 9 and 10 is formed into the Forward output signal and, having passed the inverter 5 connected in series, the delay 19 and element 8, set trigger 16

and 17 in single states, drive the circuit to its original position.

When the object leaves the control zone, sensor 2 releases, the signal 1 from the Output of which blocks the driver 13, and together with the signal 1 from the output of sensor 1 - elements AND 6 and 7 and through element OR 18 - driver 14. Thus, the initial state devices

persists.

Similarly, the scheme works when the object is moving back. In this case, the output signal is generated at the output of the And 11 element.

When the object moves Forward or Backward with a width greater than the distance between the points of sight of the sensors. At their outputs, there are combinations of signals represented by

above. As can be seen from these combinations, until the sensor 2 trips when the object moves forward (sensor 1 when the object moves back), the circuit works as in the previous case.

Then, sensor 2 (1) is activated while maintaining sensor 1 (2) in the on state. Signals O from the outputs of sensors 1 and 2 block the elements AND 6 and .7 and through the element OR 18 - the driver 14.

At the time of the sensor

2 (1), a pulse O appears at the output of the former 13 (12). Since, by the time of its occurrence, the formation of a pulse

O at the output of the imaging unit 12 (13), then this pulse transfers the trigger 15 and 17 (16), respectively, to a single (zero) state (and zero state).

Upon further advancement of the object, sensor 1 (2) is released, element 7 is unblocked, and signal 1 from its output through element OR 18 of driver 14, which causes pulse 1 at its output, which through unlocked elements AND 9 and 10 (11) is formed into the Forward (Back) output signal, and, having passed the inverter 5 connected in series, the delay 19 and the IZ element, sets the triggers 16 and 17 to a single state, bringing the circuit back to its original position.

There are situations when the object changes the direction of movement in the control zone,. which corresponds to the only possible combination of signals from the sensor outputs.

11,01,11,10,11,01,11 - when the width of the object is not less than the distance between the points of sight of the sensors 11,01,00,10,00,01,11 - when the width of the object is greater than the distance between sensor sighting points In both cases, until sensor 2 is activated and sensor 1 is released, the circuit operates similarly to the one described above. Then the object changes the direction of movement and instead of the output of efo and the zone of control and release of sensor 2 follows in the first case the object enters the area between the sighting points of the sensors, in the second it triggers sensor 1 "In the first case, this causes the sensor 2 to start and lead , we are in the initial state, as indicated earlier. With further advancement of the object, the Back is triggered yes, Chick 1, which causes the appearance of the impulse O at the output of the driver 12, which zeroes the triggers 15 and 16. At the same time, the signals from the outputs of the sensors 1 and 2 of the element B and the signal 1.c output through the element OR 18 causes the formation of a pulse 1 at the output of shaper 14. The pulse does not open the element 9. And, as it is blocked by the signal O from the output of the trigger 17, this prevents the generation of a false signal at the output of the circuit. This is followed by releasing the sensor 1, In this case, by means of the sensors from the outputs of the sensors of blocks with elements I and B and 7, and through the elements; OR 18 — the driver 14. There are no signals on the output of the circuit. When the next object moves in the Forward (Backward) direction, the part of the circuit containing inverters 3 and 4, elements I b and 7, element OR 18, driver 14, operates as described above. When sensor 1 (2) is triggered, a pulse O is generated at the output of shaper 12 (13), which confirms the Zero state of the triggers 15, and 16 (or triggers the triggers 15 and i 7) ,. The signal at the outputs of the elements And 10 and 11 is absent, because the element And 9 is blocked by the signal O from the zero output of the trigger 17. The output of the element And 11 appears the signal Back, so that the element And 9 is unblocked by the signals 1 from the outputs of the trigger 16 and 17 At the same time, signal 1, formed at the output of element AND 9 and passing through the series. Included inverter 5, delay 19, element-8, is set to one trigger 16 and 17, and the circuit is prepared for a new cycle. sensor 1 (2) the circuit of the previous state does not change . The subsequent activation of sensor 2 (1) causes the appearance of a pulse O at the output of the imaging unit 13 (12), which throws the triggers 15, 17 (16) into a single (zero) and zero state. In the same time interval, a pulse 1 is formed from the output of the driver 14, which, having passed through the unlocked elements 9 and 10, will form the Forward signal at the circuit output and through the inverter 5 connected in series, delay 19, the And 8 element will set to one triggers 16 and 17 (the signals at the outputs of the And 10 and 11 elements are absent, since the And 9 element is blocked by the signal O from the output of the trigger 17). When the sensor 2 (1) is released, the previous state of the circuit does not change. The schema is ready to count the following objects. In the second case, the return of the object triggers the sensor 1, which leads to the appearance of a pulse O at the output of the imaging unit 12, which flushes the triggers 15 and 16. At the same time, the signal O from the outputs of the sensors 1 and 2 blocks the elements 7 and 6, respectively, which in turn, together with the OR 18 element, the blocking signal at the input of the formers 14 is created. With the subsequent advancement of the object, the sensor 2 is released and the operation of the shegla is repeated, as in the first case. The movement of objects of the SOUZH configuration with clearances or group :. pts of objects moving in one; direction between intervals | smaller than the distance between the sensors, corresponds to the following combinations of sensor signals: 11,01,11,01 ,,,, 00,11, OS ,,, 10,11, lO ,,,, ll - with an object width less than the distance between the sensors; 11.01.00.10.00.01.00. ...ten, - . when the object is wider than the distance between the sensors. The circuit will work in the same way as when moving one object. The device issues a Forward (or Back) signal only with the following consecutive change of sensor operation modes: sensor 1 triggered, sensor 1 (2) released, sensor 2 triggered (1) . On all other repeated combinations of signals generated at the sensor outputs in the intervals between

working, the device does not respond. The LED-photodiode type AL-107B and PD-ZA pairs are used as sensors, respectively, logic functions are implemented on K155 series microcircuits, pulse formers and a delay element on capacitances with inverters connected in series, as a result of which the device functions completely signals when counting objects of complex configuration and groups of objects when the width of the object is larger or smaller than the distance between the points of sight of the sensors, as well as when the direction of movement of objects in the no control is observed.

Thus, the application of the proposed device allows determining with high noise immunity the direction and counting of the number of objects of complex configuration and groups of objects with an arbitrary width of each object, preventing counting of objects with a width less than the distance between the points of sight of the sensors passing through the monitoring zone. in two opposite directions, which makes it possible to increase its accuracy.

Claims (1)

DEVICE FOR CALCULATING SUBJECTS · MOVING IN TWO OPPOSITE DIRECTIONS, containing two sensors, the outputs of each of which are connected to the input of the corresponding pulse shaper and inverter, five elements And, the outputs of each inverter are connected to the first input of the Corresponding element And, the output of the second element And, the output of the second element to the first input of the element, such as OR, triggers, the direct output of the first trigger is connected to the first input of the fifth element,, the third pulse shaper and the delay element, characterized in that, in order to increase precision, the sixth element is introduced into it And, the third inverter and the third trigger. the outputs of the first and second sensors are connected to the second inputs of the second and first elements And, accordingly, the output of the first pulse shaper is connected to the first inputs of the first and second triggers, <"the output of the second pulse shaper is connected to the second input of the first _ trigger and to the first input of the third trigger , the second input of which is connected to the second input of the second trigger and with the output of the third AND element, the output of the OR element through the third pulse shaper under the keys to the first input of the fourth And element, the second and third the first inputs of which are connected to the inverse outputs of the second and third triggers, respectively, the inverse output of the first trigger is connected to the first input of the sixth element And, the second input of which and the second input of the fifth element And are combined and connected to the output of the fourth element And, which is connected to the input of the third 'inverter whose output is through. the delay element is connected to the first input of the third AND element, whose second input is connected to the input of the device.