JPH071467B2 - Device temperature control device having a plurality of temperature control units - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> In the present invention, in an apparatus system having a plurality of temperature control units (locations), each of these temperature control units is started at an optimum timing to waste heat energy. The present invention relates to a temperature control device that reduces the above.

<Prior Art> As an apparatus system having such a plurality of temperature control units, for example, an extruder of plastic or the like can be mentioned.

An example of the extruder is shown in FIG. 8, and in this device, the plastic pellets supplied to the hopper 1 are
It is sent out to the barrel 4 part of the extruder main body 3 by the feeder 2, and in this barrel 4 part, it is transferred to the tip direction by the internal feed screw and pushed out from the die part of the tip adapter 5.

At this time, in order to make the plastic flow smoothly, in the relatively long barrel portion 4, at a plurality of places and the adapter 5
The part is heated by the heater 6 ... That is,
It has a plurality of heating zones (A to D).

Then, each of these heating zones (A to D) is
The target temperature arrival time for raising the temperature to a predetermined set temperature (target value) has various causes (for example, the heat capacity and time constant of each part of the device, the heat capacity of the object to be heated is the time constant, and the thermal conductivity between them). Generally, it is often different due to differences in conditions etc.).

A schematic exaggeration of this is shown in FIG. 9 (a), for example.
As shown in (c), it takes T ₁ hour for the heating zone A to reach the set temperature, T ₂ hours for the heating zone B, and C for the heating zone.
Is T ₃ hours and so on.

<Problems to be Solved by the Invention> However, in the past, despite the difference in the required target temperature reaching times of the respective heating zones, almost no attention was paid to this point, and the starting time of the extruder was The heating of each heating zone was started at the same time.

Therefore, in the zones other than the zone having the longest target temperature arrival time among the plurality of heating zones, the heating start is too early, resulting in unnecessary heating.

The present invention has been made by paying attention to such unnecessary heating at the time of starting, which has not been considered so much in the past, and an object of the present invention is to provide a temperature control device for removing this unnecessary heating.

<Means for Solving Problems> The configuration of the present invention is as shown in FIG. 1, and has a plurality of temperature control units, and each of the plurality of temperature control units has a predetermined target. In the device system 11 that can be started when the set temperature is reached, (a) a sensor 12 that detects the temperature of each of the temperature control units.
And (b) the heater 13 that controls the temperature of each temperature control unit, and (c) the time from the start of the temperature control of each temperature control unit until a predetermined target set temperature is reached ( Target temperature arrival time storage means 14 for measuring and storing (target temperature arrival time)
And (d) the target temperature arrival times are compared with each other to obtain the longest target temperature arrival time, and the difference between the longest target temperature arrival time and other target temperature arrival times (target temperature arrival time difference) is obtained. And (e) when the temperature control in the device system 11 is started, first the temperature control unit of the longest target temperature arrival time obtained by the target temperature arrival time comparison means is started, and thereafter, ,
The temperature control unit for the other target temperature arrival times starts sequentially with a delay of the target temperature arrival time difference.
(F) After the temperature control of the device system 11 is started, the detection signal from the temperature sensor 12 ... Is compared with the target value set by the setting unit 17a, the deviation thereof is taken, and the feedback is given to the heater. It consists of the regulator 17 and.

<Operation> Therefore, according to the above-described device of the present invention, when each target temperature arrival time of the temperature control unit in the device is initially measured (by the first one-time operation or the like) and stored, When the temperature control is started in the device system 11 (from the next time), the temperature control unit of the longest target temperature arrival time is automatically started first, and then the temperature control units of other target temperature arrival times are set to desired ones. It is sequentially started with a delay of the target temperature arrival time difference. Therefore, as shown in FIGS. 5 (a) to 5 (c), the temperature of each temperature control unit reaches the set temperature at exactly the same time, resulting in unnecessary heating (shaded lines in FIGS. 5 (b) and 5 (c)). Part) almost disappears.

After the start of the device system 11, the controller 17 performs a normal temperature control operation.

<Example> FIG. 2 shows an example of the present invention.

In this example, the device system 11 is an extruder for plastic molding, and there are four temperature control parts in total (3 in the barrel 4 part).
, One for the tip adapter 5), and a thermocouple as a sensor 12 for detecting the temperature of the part and a heater 13 for heating are provided in each part. That is, there are four heating zones A to D.

Each of these sensors 12 ... And heater 13 ...
Is connected to the temperature control device 18 of the present invention having the configuration shown in FIG.

The temperature controller 18 incorporates a microcomputer shared with the controller 17 or an independent microcomputer, and the functions of the above-described means are performed by software of the microcomputer.

3 and 4 show a basic flow chart of microcomputer control.

FIG. 3 is a flowchart for measuring and storing the target temperature arrival time until each temperature control unit of the device system 11 reaches a predetermined set temperature. First, the switch is turned on in step P ₁ , each heater 13 ...・ Heating. Then, with respect to one heater 13, the temperature of the temperature control unit is input by the sensor 12 in step P ₂ . Then, in a step P _3,
It is confirmed whether or not the temperature detected by the sensor 12 has reached the set temperature. When the detected temperature is lower than the set temperature, the input signal from the sensor 12 is continuously taken. Next, in Step P ₄ , the time when the detected temperature reaches the set temperature, that is, the target temperature arrival time is measured. This target temperature reaching time is set in step P
_{At 5} , store it in the memory. This operation is similarly performed for the other heaters 13 ... And the target temperature arrival time of each temperature control unit is obtained.

Since the heating at this time is to determine the target temperature arrival time of each temperature control unit as described above and compare the lengths thereof to determine the start time of each temperature control unit, the individual heaters 13 It is also possible to heat each of the heaters separately, that is, to heat the temperature control unit which is one heater 13 to the target temperature, and then to heat another temperature control unit which is another heater 13 to the target temperature. However, in each temperature control, it is necessary to once start after lowering to a start temperature such as room temperature, and it takes a long time to obtain the total target temperature arrival time. Therefore, each heater 13 ... It is advisable to simultaneously heat and to obtain the total target temperature reaching time in a short time. Further, in the case of this simultaneous heating, temperature interference occurs depending on the temperature control unit, the target temperature arrival time including the temperature interference is measured, and this temperature interference is included in comparison with the case where the heating is performed separately. However, although the target temperature arrival time tends to be slightly shorter, in the present invention, since the start time of the corresponding temperature control unit is only controlled by the time difference between the target temperature arrival times, there is no problem in practical use. The advantages of the staggered start control of the invention are obtained.

FIG. 4 is a flow chart for sequentially starting each temperature control unit based on the target temperature arrival time of the apparatus system 11 obtained in this way.

First, in step P _20, to enter the target temperature reaching time of all Dzong which is the stored, in step P _21, the maximum value among the target temperature reaching time in each zone, from the maximum value, each zone The target temperature arrival time of is subtracted, and the value is used as the starting time of each zone. Next, in step P _22, it is determined whether the start time of each zone has passed, when the elapsed, in step P _23, starts the temperature control of the corresponding zone. If not, repeat this.

In this way, after all, the start output signals of the other temperature control units are sequentially output from the temperature control unit having the longest target temperature arrival time sequentially with a desired target temperature arrival time difference delay. And
After this start output, normal temperature control by the controller 17 is performed.

Therefore, according to the temperature control device 18 of the present invention, as described above, according to the flowchart of FIG.
Measure each target temperature arrival time of the temperature control unit in the device and store it, the next (from next time)
From the start of the temperature control in the device system 11, the temperature control unit with the longest target temperature arrival time is automatically started first according to the flowchart in FIG. 4, and then the temperature control unit with another target temperature arrival time is desired. The target temperatures are sequentially started with a delay of the target temperature arrival time difference. Therefore, as shown in FIGS. 5A to 5C described above, the temperature of each temperature control unit is
The set temperature is reached at exactly the same time, and unnecessary heating is almost eliminated.

Therefore, waste of heat energy can be significantly reduced.

Such a flow chart is shown in more detail as shown in FIGS. 6 and 7. In this flow chart, when heating all zones at the same time, m: number of zones, n: zone number (1 to m) tn: time to reach the target temperature of zone n, t: time counted by the timer, Pn: whether to reach the target temperature of zone n (1 ... already reached, 0 ... not reached) i: target temperature Shows the total number of zones reached, PVn: measured value of zone n, SVn: set value of zone n, Tmax: maximum value of target temperature arrival time, (longest target temperature arrival time).

That is, in the flowchart of FIG. 6 of the target temperature reaching time measurement, first, in step P ₃₁ to P _32, performs initial setting, in step P _33, starts the control for the target temperature reaching time measurement.

This starts, in step P _34, the zone number 1~m
Is scanned, and in step P ₃₄ , the input zone number n is compared with m + 1.
It led to _36, from the zone number m Conversely, when larger, the step P _37, undoing the zone number n, is also scanned.

In step P _36, it is determined whether the temperature of the zone number n has reached the target temperature. When you have reached
In step P _38, the zone total number to determine the same or not the target temperature reaches the number of zones. When the total number of zones is equal to the number of target temperature reaching zones, it means that the measurement of the target temperature reaching time of all the zones is completed. Therefore, if it is not completed, the process returns to step P ₃₄ .

On the other hand, in step P _36, when not reached the target temperature is inputted to the step P _39, the measured value of the sensor is to determine less not than the set value of the target temperature. It is smaller, when the words do not reach the target temperature returns to the step P _34.

Conversely when towards the measurement value is larger than the target temperature, that is, when it reaches the target temperature, determine the target temperature reaching time zone number n of the in step P _40, and stores in the storage means. As a result, in step P ₄₁ , the number of zones that have reached the target temperature is set, and the target temperature arrival symbol of the zone number n is set to “1”. Then, further in step P _42, zone total number to determine the same or not the target temperature reaches the number of zones. Since the zone total number at the same time as the target temperature reaches the number of zones would already target temperature reaching time of all zones number obtained, the step P ₄₀
The longest target temperature reaching time is calculated and stored. When the target temperature reaches the number of zones is smaller than the zone the total number will continue, for determining the target temperature reaching time of other zones number, returns to the step P _34.

If the target temperature arrival times for all the zone numbers are obtained by repeating this, the measurement program is completed.

The flow chart of FIG. 7 is for starting sequentially from the temperature control unit having a long time according to the target temperature arrival time obtained in the flow chart of FIG. 6, and steps P _{51 to} P ₅₆ are shown in FIG. The flow chart is similar to that of the flow chart. If the zone number n does not reach the target temperature in step P ₅₅ , it is input in step P ₅₈ and this step P _{55
In 58} , the zone number n
It is determined whether the time difference obtained by subtracting the target temperature arrival time is less than the timer time. When smaller, with the temperature control unit of the zone number n of the relevant, since it means that has come start time, step P ₅₉
Then, the control of the zone number n is started. Of course, at this time, the time difference becomes smaller as the target temperature arrival time becomes longer (in the zone of the longest target temperature arrival time, the time difference =
0), it will be started from the one where the target temperature reaching time is long. Control start results in step P _59, in step P _60, and sets the number of zones having reached the target temperature, the target temperature reaches the symbols of the zone number n "1".

On the other hand, in step P _58, when the timer time from the subtracting time difference is small, it means that the start time of the zone number n of the to is still returned to the step P _53.

Thus increasing the target temperature reaches zones total, by the step P _57, it becomes equal to the total number of zones, a step P ₆₁
As a result, the original temperature control of all zones is started. If it is smaller than the total number of zones, the above step P ₅₃
Return to.

In the above example, the device system 11 was an extruder for plastic molding, but the present invention is not limited to this.
The present invention can be applied to other device systems having the same problem (for example, a radiation molding machine, a heat treatment path, etc.), and may be cooled not only in the case of heating.

<Effects of the Invention> As is clear from the above description, according to the present invention, in an apparatus system having a plurality of temperature control units (locations), each of these temperature control units can be started at an optimum timing. Thus, it is possible to provide an excellent temperature control device that reduces waste of heat energy.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the apparatus of the present invention, FIG. 2 is a schematic explanatory view showing a case where the apparatus of the present invention is applied to an extruder system, and FIG. 3 is each temperature control unit of the apparatus system. Is a schematic flow chart for measuring and storing the target temperature arrival time until the temperature reaches a predetermined set temperature, and Fig. 4 is for sequentially starting each temperature control unit based on the difference in each target temperature arrival time of the device system. 5 (a) to 5 (c) are graphs showing the case where the temperature controller of the system is started at the optimum timing by the device of the present invention, FIGS. 6 and 7 are the above. A more detailed flow chart corresponding to FIGS. 3 and 4, FIG.
Schematic showing an example of an extruder having a plurality of temperature control unit,
FIGS. 9A to 9C are graphs showing a general starting state of the temperature control unit in the extruder. In the figure, 11 ... Device system, 12 ... Temperature sensor, 13 ... Heater, 14 ... Target temperature arrival time storage means, 15 ... Target temperature arrival time comparison means, 16 ... Start means, 17 ... Adjustment Vessel, 18 ... Temperature control device, A ... D ... heating zone,

Claims (1)

[Claims] 1. An apparatus system comprising a plurality of temperature control units, each of which can be started when a predetermined target set temperature is reached. A sensor for detecting the temperature of each part, (b) a heater for controlling the temperature of each of the temperature control parts, and (c) from the start of temperature control of each of the temperature control parts until a predetermined target set temperature is reached. Target temperature arrival time storage means for measuring and storing time (target temperature arrival time), and (d) comparing the respective target temperature arrival times with each other to obtain the longest target temperature arrival time and the longest target temperature arrival time. Target temperature arrival time comparison means for obtaining a difference from another target temperature arrival time (target temperature arrival time difference), and (e) obtained by the target temperature arrival time comparison means at the start of temperature control in the device system. Start means for starting the temperature control unit having the longest target temperature arrival time first, and then sequentially starting the temperature control units for the other target temperature arrival times after the target temperature arrival time difference, (f) the device system After the start of the temperature control, the temperature control device comprises: a controller that compares the detection signal from the temperature sensor with the target value set by the setting unit, takes the deviation, and feeds it back to the heater.