SU1392375A1 - Automatic liquid metering device - Google Patents

Abstract

The invention of MB, used in the chemical, pshtsevoy and other industrial areas. The purpose of the invention is to improve the accuracy of dosing and to expand the range of dose control. Depending on the recorded number at the inlet of the counter 13, the liquid metering device may give a full dose of liquid or part of it. Until the solenoids of the valves 5,6 are switched, the liquid circulates through the blocks 3,4. The movement of the piston 1 is controlled by the trigger 18, the outputs of which are fed to the block 34 of the step movement. Simultaneously with the movement, the counting counter 13 begins. The signal from the output of the trigger 14 is fed to the inputs of the circuits AND 16 and 17. The solenoid of the valve 5 is turned on through the amplifier 22 and the solenoid of the valve 3 is turned off via the inverter 23 and the timer 24. A dose is issued. .1 il. (L with:

Description

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I The invention relates to instrumentation and can be used in the chemical, chemical and other industries.

The aim of the invention is to improve the dosing accuracy and to expand the range of dose control.

The drawing shows an automatic liquid dispenser,

The device contains a piston 1 placed in a housing 2, each end cavity of which is provided with an inlet 3 () and an outlet 5 (b) valves and 7 (8) positions of the piston 1 is connected} 1Ь1М control input to the control unit, which is made the first shaper 9, the output of which is connected to the first input of the first trigger 10, the output of which is connected to the input of the variable frequency generator 11, and the second input of the first trigger to the output of the element IS-NOT 12, the reset input of the counter 1-3 and the first input of the second trigger 14 ,, the second input of which is connected Without the second driver 15 to the output of the counter 13, and the output to the first inputs of the first 16 and second 17 circuits And, the second inputs of which are connected to the outputs of the third trigger 18, each input of which is connected to the output of the sensor 7 (8) of the piston 1 and the input of the OR circuit 19, the output of which is connected via the third driver 20 and the first inverter 21 to the first input of the circuit IS-NOT 12, the second input of which is connected to the Stop button (not shown in the drawing), the output of the first circuit AND 16 is connected via the first amplifier 22 to the control input of the first output valve 5 and through the second Inverter 23, Amplifier 24 - to the control input of the first input valve 3, and output of the second circuit AND 17 through the third amplifier 25 - to the control input of the second output valve 6 and through the third inverter 26, a quarter amplifier 27 - to the control input the second inlet valve 4, the piston 1 is made ferromagnetic, and its movement in the form of inductor 28-33 successively installed along the outer surface of the housing 2, connected to the step-moving unit 34, the first input of which is connected to the output of the variable frequency generator 11 and the input of the counter 13, and the second and third inputs - with the outputs of the third trigger 18 of the control unit.

The piston has grooves filled with seals of non-magnetic material. Inductors 26-28 are offset with respect to inductors 29-31, respectively, by the amount

Р (К +7) 9 where Р - the period gear

piston structure 1; K is any integer

Each of the inductors consists of a control winding, two U-shaped-magnitoprovods and a permanent magnet of a rectangular shape. Inductors have four facets a, a, a, c, c. The distance between the central lines of the faces a, A is equal to

P (K + -), where P is the gear period

, K is any integer.

The device works as follows.

When power is applied, since the piston 1 is in the extreme right position, the position sensor 7 triggers, the signal of which arrives at the input R of the third trigger 18 of the control unit. At the inverse output of this flip-flop, the level of Log.1 appears at one of the inputs of the first circuit AND 16, since while the second input has a level of Log, O, the output of the aunt Log is 0, Therefore, a signal is generated at the output of the second inverter 22 Log, 1, which through the second amplifier 23 turns on the electromagnet of the first inlet valve 3. Simultaneously. The electromagnet of the second output valve 4 is switched on via the circuit AND 17, the third inverter 25, the fourth amplifier 26, as the inputs of the second circuit AND 17 are log.O,

The fluid fills the capacitance of the housing 2. At the same time, the signal from the sensor 7 of the position Porn enters one of the inputs of the element OR 19, and the third trigger 14, the counter 13 and the first trigger 14 are reset through the third shaper 20 sequentially connected, the inverter 21, the IS-NOT element 12. trigger 10,

When a permitting signal appears at the output of the first shaper 9 pulses, a pulse is generated at the output, which is fed to the 3X S-1D S of the first trigger 10, which allows the operation of the variable frequency getter 1.

Pulses of a constant frequency begin to arrive at the input of the block 34 of the linear displacement step and at the input of the counter 1-3. Depending on what is written down the number at the input of the counter 13, the dispenser of liquids can produce a full dose of liquid or a certain part of it. It depends on the moment of turning on the electromagnet of the output valve and turning off the electromagnet of the inlet valve. Until the electromagnets are switched, the valves 5 and 6 circulate through the inlet valves 3 and 4.

When pulses arrive at the step linear-travel unit 34 from the latter, a current enters the control windings of the inductors 28-30, as a result of which the magnetic flux generated in edges a and b, increases. The magnetic flux in the facets a and b is reduced to zero. Piston 1 is installed against facets a and c. With the passage of the second pulse, the current is supplied to the control winding of the inductors 31-33 and the current in the control windings of the inductors 28-30 is turned off. The magnetic flux created in the facets a and in the inductors 31-33 attracts the piston 1, which moves to the left by 1 / 4P. The current in the control windings of the inductors 31- 33 is now disconnected to the third pulse and the reverse winds are fed to the control windings of the inductors 28-30, consequently, a magnetic flux is formed in faces a and b, which moves piston 1 1 / 4P to the left. For the fourth pulse, the reverse current is applied to the control windings of the inductors 31-33 and the current in the control windings of the inductors 28-30 is turned off. A magnetic flux appears in the faces of a .J and in inductors 31-33, and piston 1 moves to the left another 1/4 R. Thereafter, the order of current supply to the control windings of the inductors 28-33 is repeated. To move the piston 1 to the right in the far right, the order changes the switching order of the control windings of the inductors 28-33. The movement of the piston 1 to the right or left is controlled by a third trigger 18, the outputs of which are fed to the block 34 of the step-wise linear lane (1R. Simultaneously with

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the displacement begins counting the counter 13. As soon as the comparison with the specified number occurs, the counter 13 through the second driver 15 pulses turns on the second trigger 4. The signal from the non-inverse output of the second trigger 14 goes to the inputs of the first 16 and second 17 circuits I. Since the second input of the first circuit And 16 is already the level Log.1, then the level Log.1 appears at the output. This determines the activation of the electromagnet of the first output valve 5 through the first amplifier 22 and the disconnection of the electromagnet of the first input valve 3 through the second inverter 23 and the amplifier 24. A dose is issued. When the piston moves to the extreme left position, the piston position sensor 8 is activated, which through the element OR I9, the third driver 20, the first inverter 21 and the element AND-NOT 12 form a reset of the second trigger 14 and counter 13 and the first trigger 10, also through the third trigger 8 At the inputs of the stepping block 34, a signal is generated to move the piston 1 to the right.

The circuit comes to its original position, but the dose issuing process is already determined by the non-inverted output of the third trigger 18, i.e. the electromagnets of the inlet valves 3 and 4 are turned on.

Claims (1)

Invention Formula An automatic fluid metering device, comprising a displaced piston, housed in a housing, each end cavity of which is provided with first inlet and outlet valves and a piston position sensor connected by a control input to the control unit, in order to to increase the accuracy of dosing and expanding the range of dose control, the control unit is made in the form of a first driver connected to the first input of the first trigger, the output of which is connected to the input of the control panel. variable frequency generator, and the second input of the first trigger - with the output of the element AND-NOT, the reset input of the counter and the first input of the second trigger, the second input of which is connected through the second driver to the output of the counter, and the output to the first inputs of the first and second I circuits, the second inputs of which are connected to the outputs of the third trigger connected by inputs to the piston position sensor and the input of the P1I circuit, the output of which is connected through the third driver and the first inverter to the first the input of the NAND element, the second input connected to the Stop button, the output of the first circuit AND connected through the first amplifier to the control input of the first output valve and through the second inverter and amplifier to the control input of the first input th valve r 0 output of the second circuit And through the third amplifier to the control input of the second output valve and through the third inverter and the fourth amplifier to the control input of the second input valve, the piston being made ferromagnetic and its movement moving in the form of inductors installed along the outer surface connected to the step motion unit, the first input of which is connected to the output of the variable frequency generator and the counter input, and the second and third inputs - to the outputs of the third trigger of the control unit neither Pug I one