JPS58197526A - Temperature controller - Google Patents

Abstract

PURPOSE:To constitute a simple controller, by providing switches for the number of times and one group of a digital arithmetic controlling part, storage part, and time-series control reference voltage generating part to plural groups of manual reference voltage generation parts, heating control parts, and heating parts, and switching them. CONSTITUTION:(n) Groups of heating parts 34a-34n, heating control parts 33a- 33n, and manual reference voltage generating parts 31a-31n are provided, and switches 32a-32n for the number of times are also provided. The manual reference voltage generating part 31i is connected to one terminal of the switch 32i, and one time-series control reference voltage generating part 35 is connected to the other terminal in common. The switches 32a-32n are switched under time-series control 35 through the digital arithmetic controlling part 36 by data and programs stored in the storage part 35. Consequently, the temperature of a heated body at each heating part which has different set temperature is raised and lowered by the one arithmetic controlling part without generating large thermal strain.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to 1) continuous pels used for firing thick film conductors, etc.
The present invention relates to a temperature control device for a heating device including a plurality of independent heating sections, such as a conveyor furnace.

[Technical background of the invention and its melting point]

Generally, in heating conveyor furnaces used for firing rhinoceros membrane conductors, etc., in order to obtain a desired temperature profile. A plurality of independent sets of heaters, a th1 degree sensor, and a temperature controller are arranged along the core tube.

As a temperature controller, the analog negative feedback type shown in FIG. 1 is usually used. Figure 1 ship; Temperature inspection and
The output of the temperature sensor 16 provided at the small point is given to the comparison s13 as a voltage output corresponding to the level of noise in the amplification or conversion/amplification section 17. The comparator 13 is an analog converter composed of, for example, an operational amplifier.

For example, target temperature setting with a manual variable resistor! ! J
Set value I of 1: Compares the reference voltage generated by the reference voltage generation section 12 with the centimeter output voltage, and connects the heater heating control section J4V to the heater 15 so that the difference in voltage becomes zero. Control. Therefore, a desired temperature profile can be obtained by setting the respective set values of the target temperature setters of the temperature controllers arranged along the reactor core tube according to the purpose of use. In such a furnace, it is normal to avoid rapid temperature raising and lowering operations from the viewpoint of the life of the furnace core tube and heater.
There is a phase transition point at which the material breaks down due to thermal strain and becomes unstable, and sufficient properties are required for temperature raising and lowering operations. That is.

For example, when raising and lowering the temperature of a furnace equipped with a temperature controller as shown in Fig. For example, in the quartz core t1: has 1
o It takes 8 to 10 hours to raise the temperature of a KVA-sized furnace from 20C to 600U, and if the purpose of use is such that frequent temperature increases and decreases are required, convulsions can be a major burden. .

As a method to solve such a problem of 1 dl, for example, automation by introducing a computer is considered5).

FIG. 2 is an explanatory diagram of an example of a conventional automatic temperature control system equipped with an electronic needle counter. The decile calculation system 1KlsJJ, which is the center of control, has a control procedure 42 stored in advance in the memory s2J. Therefore, the output of the temperature sensor 26 is
Conversion unit 21G (compares the digitalized temperature information of the controlled object with the target temperature information that has also been memorized in advance) 1 [IL, the resulting digital control No. 4H VD/A Analog magnetic pressure (
Heater heating control s connected to heater 211 as ^
Return to 25.

When controlling a plurality of heaters using the method described above, a single digital calculation control unit/D conversion unit is used.

Functional circuits such as the D/At switching unit must be prepared with a heater and a number of times, and even when the digital calculation control unit is moved on the hour/minute side, the heater heating control S≦=Adding a lead control false signal V is an example. This required a large number of complex functional circuits, such as the need to add functional circuits that were retained by the system. As a result, conveyor furnaces equipped with electronic computers have become very expensive, and similarly, when converting the manual temperature setting type furnaces that have been widely used in the past to electronic control systems, a large amount of cost and labor is required. Automation through the introduction of electronic computers also had major drawbacks.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks by adding the same number of switching devices, one digital calculation control section, and memory St to multiple sets of a manual standard: a pressure generation section, a heating control section, and a heating section.6 It is an object of the present invention to provide a temperature control device v which has a simple configuration, is inexpensive, and is capable of time-series control to obtain a desired temperature profile.

[Summary of the invention]

The present invention comprises a plurality of sets of heating parts and a heating control part 1, a reference voltage setting value corresponding to the temperature (2), and a heating control part 1, a manual reference voltage generator, a memory part, and a storage part. A time series control base i controlled by a digital calculation control unit having
11. The procedure is programmed in advance by an arithmetic operation control section a having a storage section, and the output voltage is generated from the time-series control reference voltage generation section or the manual reference voltage generation section. This temperature control device is operated to select and set one of the vehicle voltages.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

Figure 3 is a block diagram for explaining the configuration of this device.
Multiple heating parts J 4 a @ J 4 bs...3
4n respectively. Each heating control unit ass,
The reference voltage given to ssb...JJn is the manual reference pressure generator installed for each heating light sensor zJ.
a, 31b...Switch so that it becomes either the voltage set by JJn or the voltage set by the control reference voltage generation section 11 of "time series E1"! a32 Hatake, 32b・
...can be switched using szn. This time-based U control reference pressure generating section 35 and switching devices 11m, 31b...
The operation of JJa is controlled via the digital calculation control section 16 in accordance with the data and the nologogram stored in the storage section 31 in advance.

Figure 4 is based on the temperature control device shown in *3.

Multiple heating parts have a pH-temperature profile 1
As an example to explain how time-series control is performed, n =
3 is a diagram showing the relationship between temperature and time. In the figure, T,,'1'',,T,are respectively 1st, 2nd and 13th.
represents the temperature V of the heating section. First, the beginning of wholesale control is the origin of Tokukai T! =0.

The temperature is 'I', =T, -T, -0. The manual reference voltage for each heating system is the final temperature of the system, T1°Tb,
Tc (for example, Tb) Tc) Ta) corresponds to ゛-
set to the pressure value. Further, at lx=Q, all the switching devices 32m, 31b, and 32c are connected to a common control group single voltage generator part Jllll2. From the start of the control up to i z l 1 , all heating sections have a gradient of T a /t I of 4; the corresponding reference “−
Humidity is increased according to pressure changes.

1 = 1. Now for the first switch 1! Only iJ j a is switched to the first manual reference voltage generator 311 which is set according to Ta(2), so that from now on T1 is the temperature '11
Keep 1. 1-11 Hereafter, T, and T are (T c-T
The temperature is controlled to increase according to a reference voltage change corresponding to a gradient of a)/(1m-lx), and when 1=1, the third switch JJc is switched to the third manual reference voltage generator 31C. tm From now on, only T is (Tb-Tc)/
The temperature is controlled to increase according to the reference pressure change corresponding to the gradient of (is -1g) until t=tm, and the second switch J
Jb is switched to the second manual reference voltage generating section + section Jlb, and after -IS, a temperature Zorofile in which each heating section has one temperature is maintained. Of course i
All heating gradients from x-9 to 1 m must be selected to be sufficiently gentle so as not to be affected by the thermal time constants of all heating systems. ′! In Figure I&4, an example of temperature increase has been explained, but temperature decrease can also be performed using the same concept.

The switching device shown in FIG. 43 may be either a mechanical type or a magnetic type.

〔Effect of the invention〕

As described above, according to the present invention, a plurality of sets of heating systems,
By combining the same number of reference voltage switchers and a digital arithmetic control system, it is possible to control the temperature rising and cooling process slowly enough to avoid causing large thermal distortion to the heating furnace, thereby reducing core cost and heater life. It is possible to provide a temperature control device V with a simple configuration that allows frequent raising and lowering without any hassle.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a conventional analog temperature controller.
Figure 2 is a configuration diagram of a conventional automatic temperature control device equipped with an electronic needle counter, and Figure 3 is a configuration diagram showing an embodiment of the temperature control device according to the present invention. This is a diagram for explaining temperature raising procedure 1. JJa~31n...Manual base*voltage generation section, JJa~J
Jn...Switcher, 33a~Jan...Heating control wholesale section,
34a to 34n... heating section, JJa to Jjm... series control base pressure generating section, 36... digital calculation system a, 31... storage section. Applicant's agent Patent attorney Suzue Takehiko No. 3 Figure-144- Figure 4 Ozu Cliff

Claims (1)

[Claims] A plurality of heating units, a plurality of heating control units that control each heating unit in a corresponding manner, and each of which operates based on a reference voltage set according to a target temperature; heating control s
4.2 manual reference pressure generation sections respectively provided via switching devices, and each of the heating control sections 4. 2. a time-series control reference voltage generation section commonly connected via each of the switching devices; . The time-series control reference voltage generation section and each of the switching devices are equipped with a digital calculation control section and a storage section that control the switching devices according to a preprogrammed procedure, and the switching device controls the manual reference voltage generation section or the time-series control reference voltage generation section. A temperature control device characterized in that any one of the voltage generating units t is selected and connected to the heating control unit ζ.