SU1027703A1 - Metering device - Google Patents

Abstract

A DOSING DEVICE, containing a cycle preparation unit, the output of which is connected to the input of the program block and to the first input of the converter, the output of which is TECHCHA Esib. connected to the first input of the NAND element and through the first element of the AND to the executing mechanism, as well as a dose sensor, the second input of the NAND element associated with the output of the program block, characterized in that, in order to expand the field of application, it contains The pulse counter, the switch and the second element I are connected to the second input of the converter, the dose sensor outputs are connected respectively to the first input of the pulse counter and the third input of the converter, the output of the AND –NE element is connected to the second input of the first element I, and the third input to the output of the unit under (L cooking cycle and to the second input of the counter pulses).

Description

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The invention relates to automatic control, in particular to the control of the dosed supply of technological materal, and can be applied, for example, in control systems of the dosed supply of lubricant in a metal cutting press, assembly and other equipment.

A device for programmed control of fluid dispensing is known, comprising a series-connected sensor, converter j, a forbidden element, a memory element and an output switch, a program block, a generator, an actuator and an operation mode switch, in which the actuator is executed by a program block through a converter L

Closest to the invention is a dosing device comprising a cycle preparation unit, the output of which is connected to the input of the program block and to the first input of the transducer, the output of which is connected to the first input of the element

AND-NOT through the first element AND to the Executive mechanism, as well as the dose sensor, the second input of the AND-NOT element associated with the output of the program block. In addition, it contains the OR element, the first and second operation mode switches, s means the memory and output switch 2.

However, these devices have the following drawbacks: the regulation of the amount of material supplied is made as a function of time by changing the cycle time of the entire device, which prevents the device from being used in cycle-controlled automatic relocation equipment, does not shut down the actuator in the event of a malfunction in the metering device, such as , when the pipeline is more efficient, which leads to the loss of energy and material,

The purpose of the invention is to expand the field of application of the device.

This goal is achieved by the fact that a device containing a cycle preparation unit, the output of which is connected to the input of the program block and to the first input of the converter, the output of which is connected to the first input of the element I-NOT and through the first element I to the actuator, as well as the dose sensor, moreover, the second input of the NAND element is connected with the output of the program block, after which the pulse counter, the switch and the second And element are connected ovally, the output is connected

connected to the second input of the transducer, the outputs of the dose sensor are connected respectively to the first input of the pulse counter and to the third input of the transducer, the output of the NAND element is connected to the second input of the first

element I, and the third input - to the output of the cycle preparation unit and to the second input of the pulse counter i

o In FIG. 1 shows a diagram of the device; in fig. 2 - pulse diagram of the device.

The device contains a cycle preparation unit 1, software, unit 2, converter 3, element 4 AND –NE, per-; element 5 I, actuator b, dose sensor 7, pulse counter 8, switch 9, second element 10 I, memory element 11, switching element 12.

The output of the cycle preparation block 1 is connected to the input of the block 2 of the program, with the first input of the converter 3,

5 second (HF) counter input 8 pulses and the third input element 4 AND-NOT. The output t of block 2 of the program is connected to the second input of element 4 NAND. The output of the element 4 is NOT connected to the second

Q is the input of the first element 5 AND and the input R of the memory element. The output of converter 3 is connected to the first input of the first element 5 and, the first input of the 4 NAND element and the input S of the memory element 11. Sensor 7 first output

5 doses are connected to the counting input (C) of the pulse counter 8, and the second output of the dose sensor 7 is connected to the third input of the converter 3. The drives of each discharge of the counter 8 pulses are connected respectively to the inputs of the switch 9. The outputs of the switch 9 are connected respectively to the inputs of the second element 10 I. The output of the element 10 And is connected to the second input of the converter 5 of the device 3.

The cycle preparation unit 1 contains, for example, the 1st element 13 OR and the one-shot 14, which output is the output of the cycle preparation unit 1, are serially connected. One of the inputs of the element 13 OR is the input of the cycle preparation unit 1, the other of the inputs of the element 13 OR is connected to the power supply bus 15 via the switching element 12.

Transducer 3 contains, for example, an AND element 16 and a memory element 17 connected by an input to an output of element 16 NAND. The inverse output of the memory element 17 is the output

0 converter 3, the input R of the memory element 17 is the first input of the converter 3, and the first and second inputs of the AND element 16 are NOT the second and third inputs

5 converter 3. As a block 2 of the program, any known time relay can be used, and as a switch 9 — for example, a plug-in panel, conductors, a code switch, or electronic keys with controlled inputs. FIG. 2 numbers 18, 19, 20, 21 22, 23, 24, 25 are respectively diagrams of signals at the input of the cycle preparation block 1, the output of the cycle preparation block 1, the outputs of the program block 2, the output of the AND-4 element 4, the output of the converter 3, you during the dose sensor 7 and the output of the first element 5I. The device operates as follows. When the power is turned on, the program unit 2, the pulse counter 8, the memory element 11 and the memory element 17 of the converter 3 are preset to the zero state at which Outputs t, and tj block of the program, the outputs of each bit of the score ika 8 pulses and the output of the memory element 11 contains zero levels of signals, and the output transducer 3 - unit signal. In this case, the output of the cycle preparation unit 1, the output of element 4 AND-NES and the inputs of the first element 5 I contain signals of logic one. The actuator turns on and delivers fluid to the metering device, the plunger of which under the action of fluid pressure performs reciprocating movements, cyclically displaced portions of fluid from the dispenser and impact in the forward position on the sensor 7 dose. When the sensor 7 acts on its first output, a signal 1 appears, and on When removing a second signal, the action signal changes to positive values. The signals from the first input of the sensor 7 are fed to the counting input of the pulse counter 8, for example binary, at the outputs of which, as the counting of the input pulses, various combinations of logical signals occur. Selection of signal combinations corresponding to a certain number of input pulses is made by switching, for example, by conductors, the outputs of counter 8 on switch 9 from the input of the second element 10 I, at the output of which, upon reaching the specified reference number, signal 1 appears. from the output of the second element 10 And and the second (the inverse output of the sensor 7 by a signal from the output of the element 16 NANDEMBER memory element 17 of the converter 3 is set to the Work completed state and at the inverse output of the memory element 17 appears a signal level that turns off the actuator 6 and the installed memory element 11 in state 1 according to the information The dosing system is operational. The output of memory element 11 can be used to indicate or to give a signal to enable the technological equipment to go into operation. The specified time intervals from the beginning of the cycle at the outputs of block 2 of the program appear signals 1. If during the period from the beginning of the cycle to the appearance at the output of t-, block 2 of the program in the memory element 17 of the converter 3 is not the status is detected. Work is completed due to the absence of alternating sign of the metering plunger moves, due, for example, to a pipeline blockage, pipeline failure, or some other malfunction, then the appearance of a signal t arriving at the second input of the 4 AND-NAND element at the output of the element 4 NAND signal O appears, since the signals of this element are present at the dugue inputs of the element. Signal O from the output of element 4 NI disconnects the actuator 6 ir and sets element 11 of the state to O, the corresponding information The dosing system is faulty. The time delay t is set equal to the guaranteed time spent by the dosing system for a given number of doses. Thus, immediately after the power is turned on, the start and check of the dosing system operation is automatically performed. Further operation of the device in the automatic mode is illustrated in FIG. 2 and is carried out by periodically applying to the input of the cycle preparation block 1 a Starting Pulse, which is through j; Step 13 OR triggers a one-shot 14, the output of which is a momentary zero-level pulse, resetting the program block 2, a pulse counter 8 and the memory element 17 of the converter 3 to the zero state, after which the actuator 6 turns on and the dispenser By emitting a dose of material cyclically, each time it acts on sensor 7, the pulses from the first output of which are counted by a counter of 8 pulses, and when the specified number of counts is reached, the output of the second element 10 appears AND 1 appears. stroke of the second member 10 and a second outlet 7 doses sensor element 17 memory. the converter is installed in its state. The work is completed, the actuator 6 is turned off. At the same time, the signal level at the output of element 4 does NOT change and the memory element 11 keeps the dosing system intact. If a malfunction in the dosing system occurs during the cycle, the dosing unit turns off, at the outputs of the sensor 7 dose the change in signal levels stops even after the control time t, due to the coincidence of the signals at the inputs of element 4, AND-NOT, the zero-level signal from the output of element 4, AND-NOT disconnects the actuator 6 and resets memory element 11 to state O, corresponding to stvuyuschee information dispensing system is faulty.

When the output t2 is connected (the time delay t2 is greater than the support b) block ka 2 of the program with the input of the cycle preparation block 1, the automatic cycle of the device is periodically repeated after the time specified in block 2 of the program. When using scientific research institutes as executive mecha-; the bottom of the cyclic pump to the third input of element 5 And can b1) A multivibrator is connected. .

The ability to adjust if. the quality of the process material within the cycle of operation of the process equipment, as well as the implementation of automatic control of the dosing system and disabling the actuator in the event of a malfunction allows the device to be used in automatic readjusted lines in various industries, for example, in the metallurgical, machine-tool, food, chemical etc.

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Claims (1)

A DOSING DEVICE comprising a cycle preparation unit, the output of which is connected to the input of the program unit and to the first input of the converter, the output of which is connected to the first input of the NAND element and through the first element And to the actuator, as well as a dose sensor, the second input of the element AND-NOT connected with the output of the software unit, characterized in that, in order to expand the scope of application, it contains sequentially connected pulse counter, a switch and a second AND element, the output connected to the second input pre of the educator, the outputs of the dose sensor are connected * · respectively, but with the first input of the pulse counter and with the third input of the converter, the output of the AND element is connected to the second input of the first AND element, and the third input is connected to the output of the cycle preparation unit and to the second input of the pulse counter. JZZW’’s CO>