SU1659993A1 - Device for controlling heat treatment of products - Google Patents

Abstract

The invention relates to the building materials industry and chemical production, in particular, to devices for controlling heat treatment of products, and can be used to automate the heat treatment of large-sized products or products enclosed in massive metal molds. The purpose of the invention is to improve the accuracy of the device and the expansion of the field of application. The device for controlling the heat treatment of products contains a block of actuators connected in series to a time interval generator, a correction block, a mode parameter setter and a comparison block whose output is connected to the second input of the correction block, and the second input of the comparison block is connected to the output of the clock distributor whose inputs are connected to the outputs of the product temperature sensors. New in the proposed device is the introduction into the device of a block of programmed temperature control of the coolant, the output of which is connected to the input of the block of actuators, and one input to the second output of the correction unit, the third output of which is connected to the input of the time generator, and the third input to the second the input of the clock distributor, and the temperature sensor of the heat transfer medium, the output of which is connected to the second input of the program block of the temperature control of the heat transfer medium. 3 hp f-ly, 1 ill.

Description

The invention relates to the control and regulation of temperature in the processing of products primarily in the building materials industry or in chemical production and can be used, in particular, to automate the heat treatment of large-sized products or products enclosed in massive metal molds.

The purpose of the invention is to improve the accuracy of the device and the expansion of the scope,

The drawing shows a functional diagram of the proposed device in the case of its implementation in the analog version (it can be done in the digital version).

The device contains a shaper 1 time intervals, a correction unit 2, a setting unit 3 operating parameters, a comparison unit 4, a clock distributor 5, product temperature sensors 6, a software unit 7 for controlling the temperature of the heat transfer medium, a temperature sensor 8 for the temperature of the SL U

ABOUT

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driver, unit 9 actuators. The output 10 of the imaging unit 1 is connected to the first input 11 of the correction unit 2, one output 12 of which is connected to the input 13 of the setter 3 mode parameters, the output 14 of which is connected to the input 15 of the comparison unit 4, the output 16 of which is connected to the second input 17 of the correction unit 2.

The second input 18 of the comparator unit 4 is connected to the first output 19 of the clock distributor 5, the inputs 20 of which are connected to sensors 6 installed in the product. The second output 21 of the clock distributor 5 is connected to the third input

22 corrective unit 2, the second output

23 which is connected to the input 24 of the program control unit 7, the output 25 of which is connected to the input 26 of the actuator unit 9. The second input 27 of the software control unit 7 is connected to the output 28 of the sensor 8 of the coolant temperature. The third output 29 of the correction unit 2 is connected to the input 30 of the imaging unit 1. Input 31 is the input of the installation of the device nodes to the initial state upon power up. Input 32 is an address input of memory devices for manual setting by the operator of an address code in accordance with the selected heat treatment program.

The time slot generator 1 comprises a generator 33, a frequency divider 34, a comparison element 35, an OR element 36, a binary counter 37, and a block 38 of the memory of the length of program sections (read only memory).

 Correction unit 2 contains the first element OR 39, the shifting counter 40, the second element OR 41, the amplifier 42, the electromagnetic relay 43, the binary counter 44, the group of elements AND 45, the group of flip-flops 46 and the element 47 matching,

 pulse shaper 48.

Unit 3 mode parameters contains a block 49 of memory codes corresponding to the monitored temperature levels (read only memory), a decoder 50, an analog switch 51 and voltage dividers 52 on variable resistors.

The device works as follows.

Before the start of the technological cycle, the operator sets the constant part of the address code in accordance with the selected program of heat treatment of the product from the inputs 32 in the permanent storage device 38 of the former 1 and in the permanent storage device 49 of the setting device 3 mode parameters, as well as

the feed program and the temperature of the coolant in the heat chamber in the program control unit 7. The process of heat treatment of the product consists of areas of temperature rise for a time not less than a specified one, up to a certain level of temperature and holding at this level for a specified time according to the program.

When the device is put into operation, the frequency divider 34, the counters 37, 40 and 44 at the inputs 31 are set to the initial state. As a result, the duration of the first portion of the program is read from the read-only memory 38 and

is supplied to the comparison element 35, the time counting of the first program section is started by the generator 33 and the divider 34, and a code corresponding to the level is read from the permanent storage device 49

controlled temperature SI, is decoded by the decoder 50 and supplied to the key 51, which connects to the input 15 of the comparator unit 4 (comparator) the voltage level from one of the dividers 52 proportional to the temperature QI; from the counter

40 signal 1 is received through the element OR

41 and amplifier 42 to relay 43. Relay 43 operates and supplies 220 V with a frequency of 50 Hz to input 24 of software control unit 7 (for example, a time base motor of the CPAP instrument).

The temperature rise in the heat chamber begins according to the program specified by the program control unit 7.

Through time t is the current time code in

the divider 34 and the programmed time code n in the permanent storage device 38 coincide and are compared in the element 35 — the output 1 appears at signal 10. This signal is fed through the element OR 39 to the counters 40, 44, 37 and through the element IL And 36 to divider 34. Counters 40, 44, 37 change their state, and divider 34 is zeroed. As a result, O appears at the output of the counter 40 - the relay 43 is turned off. The time program sweep stops, as a result, the temperature in the heat chamber is maintained at Q.

Changing the address code of the counters 37

0 and 44 results in reading from the permanent storage devices 38 and 49 information about the length of time and the temperature level of the next segment (at this point is the time used for

5 control of the emergency state by the time of rise and does not participate in the program, and the temperature level remains the same (QI).

The temperature at the controlled points of the product is converted by the sensors 6 into a voltage, which is alternately connected to the input 18 of the comparator 4 with a switch of the clock distributor 5. In the comparator 4, the voltage levels from the sensors 6 are compared with the level specified by one of the dividers 52, and the error signals from output 1 The comparator 4 is fed to the input 17 of the correction unit 2.

When the voltage levels are reached from the sensors b of the preset level corresponding to the QI level, the output 16 produces a positive signal which, through the elements AND, is recorded in the triggers 46. When the temperature of all controlled points of the product reaches the level Qi, all the triggers 46 trigger They are summed from a group of elements AND 47, and the driver 48 generates a pulse, which through the element OR 39 enters the counters 40, 44,37 and through the element OR 36 - into the divider 34. Counters 40, 44 and 37 change their state, and divider 34 is zeroed. As a result, on element 41 appears 1, the relay 43 is turned on and supplies power to continue the time delay program. And from the permanent storage devices 38 and 49, information about the length of time and the level of the monitored temperature is read (this level is used in this area to monitor the alarm condition on temperature).

At a given point in time, the temperature of the coolant starts to rise to the next level, and at output 10 of the former 1, a signal appears that changes the state of the counters 40, 44, 37 and zeroes divider 34, as a result of the permanent storage devices 38 and 49 reads the information on the duration of the next section rise time and the level of controlled temperature (Oz).

Thus, the exposure time set by the software control unit is shifted by the amount of correction. This value is variable and depends on the heat inertia of the mold and the uneven heating of the product at different points.

When the device is executed in the digital version using microprocessors, there is a possibility of a wider introduction of correction into the program both in time and temperature.

Claims (4)

Claim 1. Device for controlling heat treatment of products, comprising a block of actuators installed on the coolant supply line, serially connected time interval generator, correction unit, mode parameter setter and comparison unit to the second input through 5, the first group of clock distributor contacts are connected to the temperature sensors of the products, and the output of the comparison unit is connected to the second input of the correction unit, characterized in that 0 increasing the accuracy of the device and expanding the field of application, it is equipped with a heat carrier temperature sensor and a software block for controlling the temperature of the heat carrier, the output of which is connected to 5 input of the actuator unit, and the control input of the program execution - with the second output of the correction unit, the third output of which is connected to the installation input of the temporary generator 0 intervals, and the third input is with the second group of contacts of the clock distributor, and the output of the temperature sensor of the heat transfer medium is connected to the information input of the software temperature control unit 5 heat carrier. 2. Pop-1 device, characterized in that the time interval generator contains a pulse generator and a frequency divider connected to it, a comparison element, one input of which is connected to the output of the frequency divider, and the output - to the output of the time interval former, binary the counter, whose input is connected to the input of the time interval generator and, through the OR element, to the input of the frequency divider, as well as the memory storage unit for the duration of the program sections, whose address input is connected to the output of the binary counter, and - a second 0 is the input of the comparison item. 3. Device popp. 1 and 2, characterized in that the correction unit contains a group of elements AND, whose outputs are connected to the inputs of a group of triggers, and 5 inputs - with the second and third inputs of the correction unit, the coincident element connected in series, the pulse shaper, the first OR element, the shift counter, the second OR element, 0 amplifier and electromagnetic pele, the contacts of which are connected to the second output of the correction unit, as well as a binary counter, the output of which is connected to the first output of the correction unit, and the counting Input 5 — with the third output of the correction block and with the output of the first OR element, the second input of which is connected to the first input of the correction block, while the inputs of the coincidence element are connected to the outputs of trigger groups. 4. The device according to PP. 1-3, that is, with the fact that the mode parameter setting unit contains serially connected memory blocks of codes corresponding to the key, as well as voltage dividers, the outputs of which are connected to the analog inputs of the analog switch, the output of which is connected to the output of the set mode converter controlled temperature levels, de- 5 meters, while the address input of the ROM encoder and the connected address input are connected to the input of the setpoint controller to the output of the decoder analog parameters. ten 220V network 23 2b 27 28 25 2S J P Yang go-g 2H