SU1472874A1 - Pneumatic device for cycle program control - Google Patents

Abstract

The invention relates to the field of automatic control and can be applied in pneumatic automation systems. The device comprises a control mode switching unit, a task reference block, an actuator control unit, and a dial pad. The inclusion of an ejector choke into the device structure makes it possible to significantly increase the reliability of the device as a result of simplifying its connections with the control object. 2 Il.

Description

one

This invention relates to automatic control and can be applied in pneumatic automation systems.

The purpose of the invention is to increase the reliability of the pneumatic cyclic program control device.

Figures 1 and 2 show a diagram of a pneumatic cyclic program control device.

The pneumatic cyclic programmer comprises a control mode switching unit 1, a command-output unit 2, an actuator control unit 3, an ejector throttle unit 4, a dial pad - a program setting unit 5 and a pneumatic connector 6,

Block 1 contains exit 7 Start-stop and exit 8 Reset, as well as

input 9 for selecting the control mode, inputs 10 and 11 for generating start and stop signals, control input 12 for ending the specified automatic cycle and input 13 for interrupting the specified automatic cycle (from the button). All of these inputs come from connector 6 of the device, and input 12 from the dial-up floor 5.

The command block 2 is a series of RS-flip-flops 14., ... 14 connected in series with NOT-OR elements 15. | ... l5h at the dumping inputs 161 ... 16 n of I41 ... l4 flip-flops (i and c by the elements NOT-OR 171 ... 17h at the inverse outputs 18, ... 18 h of the I41 ... l4h flip-flops.

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h

4 equal clock signals. Block 2 also contains informational inputs 20, ... 20, 2l, ... 21h and 22, ... 22 ,. The signals on these inputs are signals from limit switches indicating the position of the actuators taken from outputs 23, ... 23 of block 4 and connected to block 2 through block 5. Output 8 Reset of block 1 is connected to the setup inputs of the first RS- trigger block 2, and output 7 Start-stop block 1 is connected to other inputs of the elements NOT-OR 171-17p, the third inputs from the 1st to (n -) - th of which are connected to the direct outputs of the previous trigger 14, -lV

The control unit for the actuators 3 consists of independent RS-flip-flops 24f ... 24h, forward 25f ... 25h and inverse 26, ... 26 outputs of which are intended to control the actuators. These outputs are connected to pneumatic connector 6.

At the triggers of the block 3, which install from the dumping inputs, there are BAN 27 multi-input elements consisting of three NOT-28 elements (with three switching and three inhibiting inputs). The inputs 29, ... 29, 01 ... 30, 31, ... 31 are intended for switching the triggers 241 ... 24t from the initial state, and inputs 32, ..., 32, З3 for switching to the initial state. , ... 33t and 34A. . .34. Multi-input BANKS 27 also have inputs for blocking switching: from the initial state 35l ... 35t, 36, ... 36 ,,, and 371 ... 37 to the initial state 381. .. 38, 39 ,. ..39ty 40l ... 40t.

The unit 4 ejector chokes consists of ejector chokes 4 C ... 4I, each of which has an input 42, a main output 43 and an ejector output 44.

Inputs 42 of chokes 41 are connected to power supply line 45. The supply pressure of the unit 4 is regulated by means of droplets 46. The main outputs 43 of the ejector throttles 41 are connected to the unions of the pneumatic connector 6 connected to the limit switches on

example, such as a normally closed valve. Ejector outputs 44, which carry information about the state of the sensor, and therefore the actuator

0 5

0 5 0

five

0

five

Khanizma, derived on the outputs of 23 typesetting zero 5.

Block 5 — a dial-in field, the design, is a panel or pneumatic connector with fittings, to which, in a certain order convenient for commutation, the above inputs and outputs of the I-4 blocks are derived.

The programming of the device consists in connecting the unions of the dial-up floor 5 with a flexible tube. The program is compiled according to the cyclogram of the automaton and consists of two parts: command and blocking.

Each trigger 24 of block 3 corresponds to a two-position actuator, and to each ejector throttle 41 - a sensor indicating the position of the actuator.

A command program defining a switching sequence in block 2 by actuators in automatic control mode is realized by connecting the outputs 19 of block 2 to the control inputs 29, 30, 32, and 33 of block 3.

A blocking program defining in time the formation of clock signals at the outputs 19, as well as blocking the switching of the flip-flops 14, is realized by connecting the ejector outputs 44 of the block 4 with the information inputs 20, 21 and 22 of the block 2 and the blocking inputs 35-40 of the block 3. The blocking program, thus, it provides the possibility of forming the next clock signal - only after the next position of the actuator in the cycle, indicated by the respective sensors, is worked out. In addition, this program allows you to set the necessary locks in manual control mode.

Pneumatic cyclic software control device operates as follows.

In the automatic control mode (input 9 of block 1 is given a signal O), after a single signal is fed to input 10, the triggers 14 are set to zero signals. If the state of the actuators corresponds to the initial state, then the signals O are set at inputs 20, 21, and 22. The first trig 5I triggers

The first cell and the output of the first trigger 14 generates a signal 1. The specified single signal, through appropriate communication of the input field 5, acts on the control input of the trigger 24 connected in this clock. The signals from the outputs of the trigger 24 transpose the corresponding actuators. Upon completion of the actuator permutation, the sensors, indicating their new position, connected by communication of the dial-up field 5 with the inputs 20, 2I and 22 of block 2, will form a zero signal, and the output of the second trigger 14 will turn on the signal 1. At the same time, the trigger 14 will turn off

Further, the subsequent switchings of the triggers 14 and 24 of the block 3 and the block 2 will occur in accordance with the program set on the dial field 5.

The use of block 4 makes it possible to significantly simplify the switching of a device with sensors and increase its reliability in operation.

Claims (1)

Invention Formula A pneumatic cyclic programmer, comprising a control mode switching unit with control inputs and start-stop and reset outputs, a command / control unit consisting of serially connected RS-flip-flops, 728746 on the drop-outs and on the ent; to the outlets of each of which are installed elements NOT-11LI, an actuator control unit consisting of independent RS-triggers, a pneumatic connector and a program setting bpok, made in the form of a type-setting field to which infor The 10 input inputs and outputs of the commanding unit and the control input of the mode switching unit, the output of which is reset are connected to the set input of the RS flip-flop of the master unit, characterized in that it contains an ejector throttle unit the main and ejector outputs in each, the control unit with actuating mechanisms contains multi-input BANKS, the outputs of each pair of which are connected to the set and reset inputs of each RS flip-flop of the same block the output of the ejector throttles are connected to the pneumatic connector, the inputs of the multi-inlet (BANKS elements and the ejector outputs of the ejector throttles are connected to 30 by a dial pad, and the Start-stop output of the control mode switching block is connected to other inputs of the NOT-OR elements installed at the outputs of the RS flip-flops of the control / giving gg block, the third inputs of these NOT-OR elements, except the last, are connected to the direct exits of previous triggers.