RU1816316C - Device for measuring volume of product and for its weighing-out - Google Patents

Abstract

Use: for automatically measuring the volumetric flow rate of milk. Essence: a device for measuring flow, contains: one primary converter (1), one amplifier (2), one pulse shaper (3), one generator (4), two NAND circuits (5.6), three counters (7 10,11), one NOT circuit (8), one trigger (9), two switches (12,13), two AND circuits (14,15), one indicator (16) and one relay (17). 1 ill.

Description

The invention relates to measuring technique and can be used to automatically measure the volumetric flow rate of milk.

The invention improves the accuracy of measuring fluid flow. In this case, a simpler adjustment is also achieved and it is possible to automatically dose the amount of the substance.

The achievement of a positive result in the invention is ensured by the fact that an amplifier, a capacitor, a diode, a pulse shaper, the first and second AND-NOT elements, an inverter, the second AND element and the relay are connected in series, and the output of the primary converter is connected to the input of the amplifier connected the output with the control input of the key connected by the leads to the buses of the power source, the capacitor is connected in parallel with the power inputs of the amplifier, and the diode is turned on in the forward bias between the positive bus the power source and the power supply output of the amplifier, the anode of the diode through a pulse former is connected to the first input of the first-element AND NOT connected by the second input to the inverse output of the trigger. connected by the output to the first input of the second element AND-NOT connected to the output of the pulse generator and the output connected to the counting input of the second counter connected by the outputs to the fixed contacts of the first multipole switch, the movable contacts of which are connected to the inputs of the first element And connected the output to the input of zeroing the second counter and the counting input of the third counter, the outputs of which are connected to the fixed contacts of the second multipole switch connected by fixed contacts to the input of the second element And, the output of the pulse generator is connected to the counting input of the first counter and through the inverter is connected to the clock input of the trigger, information the input of which is connected to the output of the first AND-NOT element, the zeroing input is connected to the output of the first counter, and the inverse output is connected to the zeroing input of the counter. The drawing shows a structural diagram of a device for measuring flow.

The flow measuring device comprises a primary converter 1, an amplifier 2, a pulse shaper 3, a pulse generator 4, an AND-NOT 5.6 element; first counter 7 pulses, the element is NOT

8, trigger 9, second and third pulse counters, 10 and 11, multi-pole switches 12 and 13, elements 14 and 15, indicator 16, relay 17, key 18, capacitor

19, diode 20, resistor 21.

In the flow measuring device, the primary converter 1 is connected by an output to the input of an amplifier 2 connected to the control input of the key 18. Parallel to the power inputs of the amplifier 2 is turned on. a capacitor 19 connected to one of the terminals with the positive bus of the power source through the diode 20. The anode of the diode through the pulse shaper 3 is connected to

5 to the first input of the AND-NOT 5 element, connected by the second input to the inverse output of the trigger 9, the output of the 4 pulse generator is connected to the first input of the AND-NOT 6 element, and to the clock input of the counter 0 7 and through the inverter 8 is connected to the clock input of the trigger 9, the output element AND-NOT 6 is connected to the clock input of the counter 10, the outputs of which through the contacts of the multi-pole switch 12 are connected to

5 to the corresponding inputs of the element And 14. The output of the element And 14 is connected to the input of zeroing the counter 10 and is connected to the clock input of the counter 11, connected by the output to the indicator 16 and connected

0 through the contacts of the multi-pole switch 13 to the inputs of the element And 15. The output of the element And 15 is connected to the input of the relay 17. A resistor 21 is connected between the positive bus of the power supply and the input of the pulse shaper 3.

A device for measuring flow rate operates as follows.

At the initial moment after turning on the power, the operator, by pressing the button (not shown in the diagram), clears the contents of counters 10 and 11. Indicators 16 indicate zeros. At the direct output of trigger 9, a low level is set that locks the NAND 6 element and

5 prevents the passage of pulses from the output of the 4 pulse generator to the input of the counters 10: A high level from the inverse output of the trigger 9 resets the counter 7. At the output of the counter 7 connected to the output

0 p trigger 9, is set. Low level. At the output of the 3-pulse shaper, in the absence of input pulses, a high level is set.

Thus, at both inputs of element 5 AND-NOT there is a high level that is applied to the input of trigger 9. The pulses from the 4-pulse generator through inverter 8 are fed to input C of the trigger 9. At the trailing edge of each pulse of the 4-pulse generator,

trigger 9 of the low level signal present at the D input. Therefore, in the initial state, pulses from the pulse generator A do not arrive at the input of the counters 10, the indicators 16 indicate zeros, and the relay 17 is de-energized. .

After the operator has turned on the feed mechanism, pulses begin to flow from the primary converter 1 to the input of amplifier 2. From the output of amplifier 2, pulses are supplied to the control input of key 18, at the output of which low-level pulses are formed, which enter the communication line and then to the input of pulse shaper 3. The resistor 21 is the collector load of the key 18. Through the resistor 21 and the diode 20, the power is supplied to the amplifier 2. During the operation of the low-level pulse on the key collector 18, the capacitor 19 maintains the required voltage of the amplifier 2. By placing the amplifier 2 directly converter 1 increases the noise immunity of the device. an already amplified signal is transmitted over the communication line. In this case, an additional conductor for supplying the amplifier 2 is not required. The power is supplied via a signal circuit.

The signal from the communication line is fed to a pulse shaper 3, which generates pulses of duration that satisfy the criterion:

  N, Tgtr

where fr is the frequency of the generator 4;

N is the conversion factor of the counter 7, which is set equal to 10 m (where M is 1,2,3,.,.).

The value of M is chosen based on the required accuracy of setting the conversion coefficient. So, for example, if you want to set the conversion factor to within 10, then the value of M is chosen equal to 3.

The frequency fr is set based on the selected value of N, and also taking into account the maximum frequency of the tachometric transducer fnp.max.

1.

frfnp.max

(2)

From the output of the pulse generator 3, a low-level signal lasts for the first input of the NAND element 5, the output of which forms a high level along the trailing edge of the pulse of the 4 pulse generator is recorded in trigger 9. The high-level signal recorded in trigger 9 is fed to the input of the element 6 NAND and allows them to pass5

10 15 0 5

0

5

0

5

0

5

pulses of the generator 4 to the input of the counter 10. The low level signal from the inverse output of the trigger 9 allows the counter 7 to be counted and is also supplied to the second input of the AND-NOT element 5. After the end of the low-level pulse at the first input of the NAND-element 5, the signal at its second input continues to maintain a high level at its output.

When the number of pulses is equal to N at the input of the counter 7, a high level is established at its output, which flushes the trigger 9.

A low level from the direct output of the trigger 9 is supplied to the input of the NAND element 6 and prohibits the passage of pulses from the generator 4 to the input of the counter 10, a High level from the inverse output of the trigger 9. resets counter 7. The circuit returns to its original state.

Thus, for each pulse coming from the tachometric transducer 1, N pulses will be supplied to the input of the counter 10.

When the number of pulses equal to the number set by the multi-pole switch 12 arrives at the input of the counter 10, a high level c. Of the output of each counter through the contacts of the switch goes to the inputs of the element 14 I. At the output of the element 14 AND, a high level is formed, which resets the counter 10 to the initial state nie. Next, the count is repeated.

Thus, an impulse is generated at the output of element 14 AND, each of which corresponds to the passage of a quantity of product equal to the unit of measurement of this product.

From the output of element 14 And the pulses are fed to the input of the counter 11 for counting and indication on the indicator 16.

When the product quantity reaches the value set by the multi-pole switch 13, a high level from the output of the counter 11 through the contacts of the switch 13 is fed to the input of the element 15 I. At the output of the element 15 And a high level is formed, which is fed to the relay 17. Relay 17 disables the actuator of the product .

Claims (1)

The claims A device for measuring the quantity of a product and its dosage, comprising a primary transducer, a key, a pulse generator, a trigger, a first, second and third counters, a first element And, a first and second multipole switches and an indicator connected to the outputs of the third counter, characterized in that an amplifier, a capacitor, a diode, a pulse shaper, the first and second AND-NOT elements, an inverter, the second AND element and the relay in series, are introduced into it, while the output of the primary converter is connected to the input of the amplifier connected to the output with the control input of the key, connected by the leads to the power supply buses, the capacitor is connected in parallel with the power inputs of the amplifier, and the diode is turned on at a direct offset between the positive power supply bus and the power output of the amplifier, the anode of the diode through a pulse shaper connected to the first input of the first AND-NOT element connected by the second input to the inverse output of the trigger, connected by the direct output to the first input of the second AND-NOT element connected by the second input to the output of the pulse generator, and the output to connected to the fixed contacts of the first multipole switch, the movable contacts of which are connected to the inputs of the first element And connected to the output of zeroing the second counter and the counting input of the third counter, the outputs of which are connected to the fixed contacts of the second multipole switch connected by moving contacts to the inputs of the second element And, the output of the pulse generator is connected to the counting input of the first counter and through the rotor is connected to the clock input of the trigger, the information input of which is connected to the output of the first AND-NOT element, the zeroing input is connected to the output of the first counter, and the inverse output is connected to the zeroing input of the first counter.