SU1677694A1 - Device for autoclave pressure control - Google Patents

Abstract

The invention relates to systems for adjusting technological parameters for a given program. The purpose of the invention is to improve the accuracy of the device by achieving the two prohibition elements, two switching elements and direct and reverse comparison elements are introduced into the device containing the pressure sensor in the autoclave, the pressure regulators, the programming unit and the actuators. 1 il.

Description

The invention relates to the automatic control and regulation of technological parameters according to a given program and can be used in the automation of technological processes in the rubber and chemical industries. It can also be used in schemes with a given program for controlling the environment in autoclaves.

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

The drawing shows a functional diagram of the device.

The device contains an autoclave 1 in which the pressure is measured by the pressure sensor 2, and the task is generated by the program unit 3, pressure regulators 4 and 5 (agents), inverse and direct comparison elements 6 and 7, switching elements 8 and 9, prohibition elements 10 and 11, executive bodies 12 and 13.

The actuators 12 and 13 open with an increase in the output signal of the controllers 4 and 5. The control 4 selects the reverse, i.e. an increase in the controlled parameter leads to a decrease in pressure in the output line of the regulator. Regulator 5 is selected direct, i.e. an increase in the controlled parameter leads to an increase in pressure in the output line of the regulator. Comparison elements 6 and 7 are designed to compare two analog signals of pressure sensor 2 and software setpoint 3 and form discrete command signals 1 and 0, depending on the comparison result. Comparison element 6 is the inverse comparison element. This means the following: if the signal of pressure sensor 2 is less than the signal of software setpoint 3, then signal 1 appears at the output of comparison 6, if the signal of pressure sensor 2 is greater than that of software setpoint 3, then output 6 appears. O. 7 is an element of direct comparison. This means the following: if the signal from pressure sensor 2 is less than the signal from software setpoint 3, then O appears at the output of element 7, if the signal from pressure sensor 2 is greater than the signal from software setting 3,

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then at the output of the comparison element 7 - 1. Thus, at any time the comparison of the signals of the setting device 3 and the sensor 2 at the output of the elements 6 and 7 should always be opposite signals (1 and 0 or 0 and 1). The prohibition elements 10 and 11 are designed to form a command signal, respectively, for elements 8 and 9. Because of the absence of a control signal, the outputs of elements 8 and 9 are connected to the same inputs of these elements, i.e. There are no signals at the control inputs of the organs 12 and 13. If there are control signal elements 1 and 8 at the control input, the control signals from the controllers 4 and 5 are fed to the control inputs of the bodies 12 and 13.

The device works as follows.

The required parameter change on the software setpoint 3 is set. The pressure in autoclave 1 at the initial moment is zero. When a signal appears at the output of the software setpoint 3, the signal of the pressure sensor .2 becomes less than the signal of the programming setpoint 3 and at the output of element 6, the signal 1 appears, and at the output of element 7 - O. These signals simultaneously arrive at the inhibit elements 10 and 11. Since the signal 11 arrives at the inverse input on element 11, there will be no signal at the output of element 11. Since the signal 1 arrives at the direct input to the element 10, then the signal 1 is output at its output. This signal, hitting the control input of the element 8, ensures its switching. In this case, the organ 12 on the working agent supply line through element 8 will be connected to the output of the working agent supply regulator 4. Organ 12 opens and the pressure is raised by regulator 4 according to the program specified by the program unit 3.

If the signal of the program setting device 3 becomes less than the signal of the pressure sensor 2, then O appears at the output of the comparison 6 element, and the output of the comparison element 7 is 1. These signals simultaneously go to the prohibition elements 10 and 11. At the output of the 10 element, the signal There will be no signal 1 at the output of element 11, which ensures the switching of element 9, while the organ 13 on the reset line of the working agent through element 9 will be connected to the output of the reset agent of the working agent 5. The organ 13 opens and the DUVLRNYA discharges Regulator 5 according to the program specified by the software h sensor cm 3.

As long as the signal of pressure sensor 2 and the signal of software setpoint 3 are different from each other, i.e. At the inputs of regulators 4 and 5, discharging will take place, until then at the output of regulators 4 and 5 control regulating actions will take place, the value of which will depend on the settings of the regulators and on the value of

0 mismatch at the inputs of the regulators. The operation of the regulators 4 and 5 is aimed at eliminating the existing deviation of the current pressure value in the autoclave, the pressure setpoint by the software unit and only one of these regulators (depending on the triggering of elements 6 and 7 and prohibition elements 10 and 11) will control its until the complete elimination of disagreement on

0 controller input.

When the signals of the pressure sensor 2 and the software setting device 3 are equal, the control signals at the output of the regulators 4 and 5 are absent and the organs 12 and 13 na5 move in the closed state. This means that the pressure value in autoclave 1 is equal to the preset value and autoclave 1 has no connection with either the supply line or the discharge line. The state of elements 6 and 7 and prohibition elements 10 and 11 are indefinite and not significant. With any deviation from the equality of the signals of the sensor 2 and the setting device 3, the first elements 6 and 7 and one of

5, prohibitions 10 and 11, and one of the regulators 4 or 5 is connected to its executive body, with which the controller compensates for the deviation that occurred,

0

Claims (1)

 Claims An autoclave pressure control device comprising an autoclave pressure sensor connected by an output to 5 to the first inputs of the first and second pressure regulators, the program setpoint actuator and the executive bodies, one of which is installed on the supply line and the other on the working agent discharge line, which differs from the fact that, in order to improve the accuracy of the device, contains two elements of direct and reverse comparison, two prohibition elements and two switching elements, the outputs of which 5 are connected to the inputs of the respective executive bodies, the control inputs to the outputs of the corresponding prohibition elements, and the information inputs to the outputs of the corresponding pressure regulators, the output of the program unit is connected to the second inputs of the pressure regulators and to the first inputs of the direct and reverse comparison elements , the second inputs of which are connected to the output of the pressure sensor in the autoclave, the output of the inverse comparison element is connected to the direct input of the first and to the inverse input of the second prohibition element, and the output element coagulant direct comparison - with direct input of the second and inverted input of the first element prohibition.