SU1352469A1 - Heating process regulating device - Google Patents

Abstract

The invention relates to the field of automatic control and can be used in regulating the heating processes of various substances in technological devices in various industries, mainly in the regulation of inertial objects with transitional delay. The purpose of the invention is to reduce the amount of overshoot and the amplitude of self-oscillations. During the heating process, he coke Is3 j; C35 with

Description

three heaters are switched on in a predetermined sequence, so that if the temperature of the object becomes higher than the specified value, the amount of energy supplied to the object is first reduced and then increased again. In the case of. If the temperature of the object becomes less than the specified value, the amount of energy supplied to

1352469

the object is first increased and then reduced again. The device for regulating the heating process contains three heaters 11,12,13, a positional relay unit 4, the first 9 and second 10 time relays, as well as other elements that, when turned on, ensure the implementation of the required algorithm turn on the heaters. 1 il.

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The invention relates to automatic regulation and can be used in the regulation of the heating processes of various substances in technological devices in various industries, mainly in the regulation of inertial objects with transition lag.

The purpose of the invention is to reduce the amount of overshoot and the amplitude of self-oscillations when controlling objects with a transient lag.

The proposed device is shown in the drawing.

The device contains a sensor I, a sensor sensor 2, a reference element 3, a positional relay unit 4 consisting of comparators 5.6 and intermediate relay elements 7, 8, the first 9 and the second 10 time relays, the first 11, the second 12, the third 14 heaters.

The device works as follows.

From the output of sensor 1, the signal Ug, proportional to the current value of the product temperature, is fed to the first input of the comparison element 3, to the second input of which an ultrasonic signal is received, proportional to the set value of the temperature. In the course of adjustment, the error signal V, coming from the output of element 3 to the input of Positional Relay Unit 4, periodically changes its polarity, which leads to switching of the unit and switching of heaters. For example, if the temperature of the product becomes greater than the set value, the signal V0 becomes negative, that

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triggers comparator 6 and intermediate relay 8, as well as disconnecting intermediate relay 7. The opening contacts of intermediate relay 8 open and, accordingly, disconnect the supply voltage from all heaters. The product is cooled intensively. At the same time, the closing contact of the intermediate relay 8 is closed and the time relay 9 is connected to the voltage. After a predetermined time t expires, the closing time 9 contact of the relay 9 closes and the heater 13 is connected to the supply voltage. When the heater 13 is connected, the product heats up to the next change in the sign of the error signal Vp. Since the energy released during operation of the heater 13 is not enough to maintain the specified temperature of the product, its temperature decreases and at some time the signal Vp becomes less in absolute value of the signal Vj supplied to element 3 from setpoint 2. The error signal V becomes greater than O , the intermediate relay 8 is turned off and the intermediate relay 7 is turned on, which connects the time winding of the time relay 10 to the supply voltage with its closing contact. As the contacts of relay 8 are closed, all heaters turn on simultaneously and the product heats up intensively. After a time delay t, a blur occurs.

the disconnection of the contact time of the relay 10 is disconnected and the heater 12 is turned off. Since the total power of the heaters 11 and 13 is such that the amount of energy applied when they are turned on is greater than the value needed to maintain the desired temperature of the product increases again and at some point time again becomes greater than the specified value. The process described hereinafter is repeated.

Claims (1)

Claim 5 A device for regulating the heating process, comprising a sensor and a parameter setter, connected to the inputs of the reference element, to the output 20 of which a positional relay unit with closing and opening contacts is connected, the first time relay, M.R. Compiled by L. Pentsova Tehred M. Khodanich Proofreader c. But ha Order 5566/48. Circulation 863 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. D. 4/5 Production and Printing Precinct, Uzhgorod, st. Project, 4 the key to the power source through the second closing contact of the relay unit, the first heater connected to the power source through the first disconnecting contact of the relay unit, characterized in that, in order to reduce the amount of overshoot and the amplitude of self-oscillations when controlling objects with transitional delay, the device contains the second time relay connected to the power source through the first closing contact of the relay unit, the second heater connected to the power source through the series These are the break contact of the second time relay and the first break contact of the relay unit, and the third heater connected to the power supply through the second break contact of the relay unit, shunned by the closing contact of the first time relay.