SU1179294A1 - Device for programmed controlling of temperature - Google Patents

Abstract

A DEVICE FOR SOFTWARE TEMPERATURE REGULATION, containing a reversible pulse counter, connected by bit outputs to the first input of the comparison unit and to the input of the code-voltage converter, connected by the output to the first input of the subtraction unit, connected by the second input to the temperature sensor output, and the output to the input of the actuator element of the heater, the starting element, characterized in that. that, in order to increase the reliability and simplify the device, a memory block, a program input block, a pulse counter, a controlled frequency divider and a control block containing an element AND and a trigger connected by a direct input to the output of the trigger element and zeroing input are inserted into it the pulse counter, the zero input to the first output of the memory unit, and the direct output to the first input of the And element connected by the second input to the output of the comparison unit, and the output to the counting input of the pulse counter connected by the discharge outputs the input of the memory unit connected by the information input to the output of the program input block, the second output to the second input of the comparison unit, the third output to the control input of the reversing pulse counter, and the fourth output to the input of the controlled frequency divider connected to the output counting input reversible pulse counter. about o

Description

The invention relates to devices for programmatically controlling the temperature of various technological processes and can be used, for example, in sintering transparent electro-optical ferroelectric ceramics.

A temperature control program for obtaining a transparent electro-optical ferroelectric ceramics should consist of a certain number of areas with a constant rate of temperature change (areas of heating or cooling) and a certain number of sections of holding a given temperature within a site. In order to obtain a transparent electro-optic ferroelectric ceramics, a temperature control program consisting of 10–20 different sections is currently required.

The purpose of the invention is to increase the reliability and simplify the device.

FIG. 1 is a block diagram of the device; in fig. 2 - functional block diagram.

The device contains a starting element 1, a control unit 2, a block for setting program parameters 3, containing a pulse counter 4, a memory block 5, a program input block 6, a controlled frequency divider 7, a comparison block 8, a temperature setting block 9, including a reversible pulse counter 10, transducer, coding 11, subtraction unit 12, actuator 13, heater 14, temperature sensor 15, object 16. The control unit contains a trigger 17, an I-18 element.

The device works as follows.

Before starting work, the operator inputs data on the temperature change program into the device using the program input unit 6. When the device is put into operation according to a predetermined program, a command is received from the starting element 1 on the control unit 2 to begin the program. From the control unit 2, the counter 4 of the program parameter setting unit 3 receives a command that sets the counter 4 to a state in which the memory unit 5 outputs information about the first program section: about the rate of temperature change - to the controlled frequency divider 7, about the limit the temperature of the section — to the comparison unit 8; about the direction of the temperature change — to the reversible counter 10 of the block of temperature settings 9. From the controlled frequency divider 7, pulses are sent to the reversible counter 10 with the following frequency defined by the specified in the memory block 5 of the block for setting the parameters of program 3 with information about the rate of temperature change in the first section of the program. The state of the reversible counter 10, corresponding to the number of incoming pulses, the converter 11 converts into a voltage, which in the subtraction unit 12 is compared with the signal

temperature sensor 15, which characterizes the temperature of the object in the current moment. The difference between the object temperature signal and the output voltage of the converter 11 controls the actuator 13, which determines the current through the heater 14. The temperature of the object 16 changes until the output signal of the temperature sensor 15 becomes equal to the output signal of the converter 11.

0 Thus, the output of converter 11 determines the temperature of the object. In the comparison block 8, the code corresponding to the state of the reversible counter 10 is compared with the code coming from the parameter setting program} we 3 with the code setting the limiting temperature of the first portion of the temperature program. When the reversing counter reaches 10 a state corresponding to the temperature limit of the first program section, the block

0 Comparison 8 issues a command to control unit 2 about the end of the first portion of the temperature program. From control unit

2, a command is received to the counter 4 of the program parameter setting unit 3, which sets the counter to the state in which the memory block 5 provides information about the second portion of the temperature program. The up / down counter 10 continues counting pulses at a rate determined by the rate of change of temperature in the second portion of the temperature program specified in memory block 5 of the program parameter setting unit 3 to the state determined by program parameter setting block 3. per comparison unit 8 and information on the limiting temperature of the second temperature program section, etc. The temperature holding sections are actually represented by the areas with the lowest rate of temperature change tours. The operation of the device in these areas has no features. After the last program section has been executed from the program parameter setting unit 3, a command is sent to the control unit 2 and the program ends and the output of the information from the program parameter setting unit 3 is stopped.

The trigger element 1 is a device that forms a single pulse when a button is pressed.

The memory block 5 is a 16-word random-access memory with 10 bits and provides information on the rate of temperature change (10 bits) on the direction of the temperature change (2 bits).

bit), about the temperature limit of the temperature program section (10 binary bits), and about the end of the temperature program (one binary bit). The portion of the temperature program about which the information is issued is determined by the state of the counter 4.

The program input unit 6 is a unit of switches and buttons, with the help of which the elements of the memory unit 5 are transferred to the information recording mode and the corresponding inputs are applied to the voltage "0 or" 1 according to the temperature change program recorded in the binary code.

The subtraction unit 12 is a precision resistor connected in series with the thermocouple of the temperature sensor 15, on which the program voltage is generated by the output current of the digital-to-analog converter 11. The resistor and thermocouple are turned on so that their voltages are subtracted from each other at the output terminals of the subtractor.

The actuating element 13 is a high-precision temperature controller BPT-2, the output current of which heats the heater 14 of the furnace in which the object 16 is located, whose temperature must be changed according to a predetermined program. Temperature sensor 15 - thermocouple.

The control unit operates as follows.

The command pulse from the trigger element 1 is transmitted directly to the counter 4 of the parameter setting block of program 3, sets it in the "O" state, and also sets the trigger 17 to the "1" state, which further allows the passage of pulses from the comparison block 8 through the I- element 18 to counter 4 at the end of each section of the temperature program. At the end of the temperature program from the memory block 5, the program parameter setting block

3, the control unit 2 receives a pulse that sets the trigger 17 to the state "O", which prohibits the passage of pulses from the comparison unit 8 to the counter 4. At the beginning of the program, the impulse from the control unit 2 sets the counter to the state "O" corresponding to the first section of the temperature program , and further pulses from the control unit 2 in the states 1, 2, 3, ..., (p-1), (n is the number of sections of the temperature program,) corresponding to the remaining sections of the temperature program.

17

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FIG. 2

Claims (1)

DEVICE FOR SOFTWARE TEMPERATURE CONTROL, containing a reversible pulse counter connected to the discharge outputs with the first input of the comparison unit and the input of the code-voltage converter connected to the first input of the subtraction unit connected to the second input with the output of the temperature sensor, and the output with the input of the actuator heater, starting element, characterized in that, in order to increase reliability and simplify the device, a memory block, a program input unit, a pulse counter, an avaliable frequency divider and a control unit containing an AND element and a trigger connected by a direct input to the output of the trigger element and to the input of zeroing the pulse counter, by a zero input to the first output of the memory unit, and by a direct output to the first input of the And element connected by the second input to the output of the comparison unit, and the output with the counting input of the pulse counter connected by bit outputs to the control input of the memory unit connected by the information input to the output of the program input unit, the second output to the second input of the bl Comparison, the third output - with the control input of the reversible pulse counter, and the fourth output - with the input of a controlled frequency divider connected by the output to the counting input of the reverse pulse counter. fig L SU ,,,, 1179294>