JPH0863239A - Method and deivce for temperature cotnrol and method and device controlling cylinder temperature of injection molding machine - Google Patents

Abstract

PURPOSE: To carry on operation even after disconnection is detected by storing a temperature control output value at specific intervals of time and controlling a heater by using a nearby temperature control output value once the disconnection of a temperature measuring sensor is detected. CONSTITUTION: In a normal state, a switch 30 connects with a terminal A to send a temperature control output value 3 controlled on the basis of a temperature set value 2 from a control arithmetic part 3 to a heater 1 through a power amplification part 4, the temperature of the heater 1 is inputted as temperature measurement data 7a from the temperature measuring sensor 5 to the control arithmetic part 3 and controlled to specific temperature, and the temperature control output value 3a is stored in a storage part 35 at specific intervals of time. Then if the temperature measuring sensor 5 has disconnection, the switch 30 is switched to connect with a terminal B, and the total value of the output 35a of the storage part 35 right before the disconnection which is stored so far and an adjustment value 34a from an arithmetic means 34 which uses the manual adjustment value 34a and the temperature control output value of an adjacent segment cylinder is supplied to the power amplification part 4 to control the heater 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control method and apparatus and a cylinder temperature control method and apparatus for an injection molding machine. The present invention relates to a new improvement for controlling a heater using a temperature control output value of time and a temperature control output value of an adjacent segment cylinder with a manually adjusted value.

[0002]

2. Description of the Related Art As a conventional temperature control method of this type, the configuration shown in FIG. 2 has been generally adopted. That is, the reference numeral 1 in FIG. 2 is a heater, and the temperature control output value 3a from the control calculation unit 3 that is input and controlled by the temperature set value 2 is amplified by the power amplification unit 4 and supplied to the heater 1. To be done.

Next, the output 5a of the temperature measuring sensor 5 which is a thermocouple provided in the heater 1 is detected by the disconnection detecting circuit 6 and is inputted to the control calculating section 3 as the temperature measuring data 7a via the amplifier 7. At the same time, the disconnection detection circuit 6 outputs the disconnection alarm signal 6a.

In the above-mentioned conventional configuration, the disconnection state of the temperature measuring sensor 5 detected by the disconnection detection circuit 6 is input to the control calculation unit 3 as the temperature measurement data 7a, and the disconnection alarm signal 6a is generated to perform injection molding. The machine was stopped.

[0005]

Since the conventional temperature control method and apparatus are configured as described above, there have been the following problems. That is, since the operation of the injection molding machine was stopped while the disconnection alarm was output, continuous operation could not be performed, and a large amount of work such as cleaning the cylinder was required for restarting after the engine was once stopped. This had to be done, resulting in a significant decrease in production efficiency.

The present invention has been made in order to solve the above problems, and in particular, the temperature control output value at a time slightly earlier in time can be obtained without interrupting the operation when the temperature measuring sensor is disconnected. An object of the present invention is to provide a temperature control method and a device for controlling a heater by using the temperature control method.

[0007]

A temperature control method according to the present invention detects a temperature detection value from a temperature measurement sensor, compares the temperature detection value with a temperature set value set from the outside, and compares the temperature with the temperature detection value. In the temperature control method of determining the control output value and controlling the heater using the temperature control output value,
The temperature control output value is stored at predetermined time intervals,
It is a method of controlling the heater using a stored value of the temperature control output value immediately after the time when the disconnection of the temperature measuring sensor is detected.

A cylinder temperature control method for an injection molding machine according to the present invention is a cylinder temperature control method for an injection molding machine, wherein the temperature of the cylinder is controlled by using a heater and a temperature measuring sensor provided in each of a plurality of segment cylinders. In the above, the temperature control output value for each predetermined time interval for each segment cylinder is stored, and as the temperature control output value for the segment cylinder after the disconnection of the temperature measuring sensor is detected, the segment cylinder To the temperature control output value closest to the time, the total value of the adjustment value which is the output of the calculation means using the temperature control output value of the segment cylinder adjacent to the segment cylinder and the manual adjustment value manually adjusted, This is a method of outputting to the heater of the segment cylinder.

A temperature control device according to the present invention detects a temperature detection value from a temperature measuring sensor, compares the temperature detection value with a temperature set value set from outside, and determines a temperature control output value based on the comparison result. A temperature control device for controlling a heater using the temperature control output value; and a first switch unit connected to the heater via a power amplification unit;
A disconnection detection circuit connected to the switch unit and the temperature measuring sensor, a control calculation unit connected to the first switch unit and inputting a temperature set value, and a second timer which is turned on and off by a timer connected to the control calculation unit. A switch unit and a storage unit that is provided between the switch units and stores the temperature control output value from the control calculation unit, and after the time when the disconnection of the temperature sensor is detected, the temperature immediately before the time. The control output value is supplied from the storage unit to the power amplification unit.

A cylinder temperature control device for an injection molding machine according to the present invention is a cylinder temperature control device for an injection molding machine, wherein the temperature of the cylinder is controlled by using a heater and a temperature sensor provided in each of a plurality of segment cylinders. In, a first switch unit connected to the heater via a power amplification unit, a disconnection detection circuit connected to the first switch unit and the temperature sensor, and a temperature set value connected to the first switch unit. Is input, a second switch section that is turned on / off by a timer connected to the control calculation section, and a storage section that is provided between the switch sections and that stores a temperature control output value from the control calculation section. And a manual setting means for outputting a manual adjustment value to be added to the power amplification section,
And a calculation unit that uses the temperature control output value of the adjacent segment cylinder that outputs an adjustment value, and the temperature control output value immediately after the time when the disconnection of the temperature measuring sensor is detected is stored in the storage unit. To the power amplification section.

More specifically, the power amplification section is configured to add a manual adjustment value and an adjustment value which is an output of a calculation means using a temperature control output value of an adjacent segment cylinder. is there.

[0012]

In the temperature control method and apparatus according to the present invention, the temperature control output value is stored at every predetermined time interval, and the temperature control immediately after the disconnection of the temperature measuring sensor is detected. By controlling the heater using the stored value of the output value, the operation can be continued in the state before the detection of the disconnection without stopping the operation even after the detection of the disconnection.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a temperature control method and apparatus and a cylinder temperature control method and apparatus of an injection molding machine according to the present invention will be described in detail below with reference to the drawings. It should be noted that the same or equivalent parts as those of the conventional example will be described by attaching the same reference numerals. In FIG. 1, reference numeral 1 is a heater, and a temperature set value 2 is input to the heater 1 and the temperature detection value of a temperature measurement sensor 5 described later is obtained by a well-known PID control (proportional integral control). The temperature control output value 3a from the control calculation unit 3 that is controlled by being compared with certain temperature measurement data 7a is the power amplification unit 4
It is amplified by and is supplied to the heater 1.

The output 5a of the temperature measuring sensor 5 which is a thermocouple provided in the heater 1 is detected by the disconnection detecting circuit 6 and is inputted to the control calculating section 3 as the temperature measuring data 7a via the amplifier 7. The disconnection detection circuit 6 is configured to output a disconnection alarm signal 6a.

A first switch section 30 and a first addition section 31 are connected in series between the power amplification section 4 and the control calculation section 3, and the first addition section 31 has a second addition section. Part 3
The manual adjustment value 33a from the manual setting means 33 and the adjustment value 34a from the calculation means 34 using the temperature control output value of the adjacent segment cylinder are added via 2 through 2.

The control section 3 is connected to the first terminal A of the first switch section 30 and the storage section 35 is connected to the second terminal B of the second switch section 36 with respect to the control section 3. Connected via the second switch section 36 of the second
The switching piece 36a operates once per 10 minutes (note that this "1
"0 minute" has no strict meaning and is determined within a range of about 5 to 15 minutes.) The timer 37 is configured to perform on / off operation.

Disconnection detection signal 6a of the disconnection detection circuit 6
The (corresponding to the conventional disconnection alarm signal) is configured to switch the first switching piece 30a of the first switch section 30 to any one of the first and second terminals A and B.

A case in which the temperature of the heater is actually controlled in the above-mentioned configuration will be described. First, in a normal normal state, the first switching piece 30a of the first switch section 30 is connected to the first terminal A, and the temperature control output value controlled based on the temperature set value 2 set from the outside. 3a is sent from the control calculation unit 3 to the heater 1 via the power amplification unit 4, and the temperature of the heater 1 of the injection molding machine or the like is measured by the measurement sensor 5, for example.
Is input to the control calculation unit 3 as the temperature measurement data 7a and controlled to a predetermined temperature. Further, in this case, the temperature control output value 3a is stored in the storage unit 35 by switching the second switching piece 36a of the second switch unit 36 at a rate of about once every 10 minutes by the operation of the timer 37.

Next, in the above-mentioned state, the temperature measuring sensor 5
Is disconnected, the first switching piece 30a is switched to the second terminal B by the disconnection detection signal 6a detected by the disconnection detection circuit 6, and at the same time, the operation of the timer 37 is stopped, and the disconnection that has been stored so far is disconnected. The output 35a of the storage unit immediately before (at the time of) is supplied from the second terminal B to the power amplification unit 4, and the first adjustment unit 31 receives the manual adjustment value 33a and the temperature control output value of the adjacent segment cylinder. The adjustment value 34a from the calculation means 34 to be used is added and subtracted through the second adder 32, and the heater 1 is added as a total value.
Is controlled, and the operation can be continued without causing an operation stop when a disconnection is detected.

Further, in the above-mentioned embodiment, the case where the general heater is controlled is described, but for example, a large number of well-known segment cylinders (not shown) and the heater 1 are provided in each segment cylinder. Configuration,
It is also possible to provide the heater 1 and the temperature measuring sensor 5 for each segment cylinder, store the temperature control output value for each predetermined time interval for each segment cylinder, and perform the same temperature control as described above.

[0021]

Since the temperature control method and device and the cylinder temperature control method and device of the injection molding machine according to the present invention are configured as described above, the following effects can be obtained. (1) Even if the temperature measuring sensor is disconnected, the heater can be operated with the temperature control output value stored in the storage unit.In a system that does not require highly accurate temperature adjustment, the system will continue operation without shutting down the system. it can. (2) In the operation after disconnection of the temperature sensor, if you want to adjust the operating status of the heater, you can manually input the "manual adjustment value" to perform finer temperature adjustment. (3) If the temperature measurement value of the sensor next to the sensor rises after the temperature sensor is disconnected, the heater operating condition corresponding to the ambient temperature and operating condition can be adjusted by adjusting the operating state of the heater of the sensor that is disconnected at the same rate. Can drive. (4) Due to the above-described effects, in the case of an injection machine, molding of miscellaneous goods with a low degree of accuracy can be continued without problems even if the temperature measuring sensor is broken.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an apparatus to which a temperature control method according to the present invention is applied.

FIG. 2 is a configuration diagram showing an apparatus to which a conventional temperature control method is applied.

[Explanation of symbols]

1 heater 2 temperature set value 3 control calculation unit 3a temperature control output value 4 power amplification unit 5 temperature sensor 6 disconnection detection circuit 30 first switch unit 33 manual setting means 33a manual adjustment value 34 temperature control output value of adjacent segment cylinder Computation means using a reference numeral 34a adjustment value 35 storage section 36 second switch section 37 timer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area G05B 9/02 D

Claims (5)

[Claims] 1. A temperature detection value is detected from a temperature sensor (5), and the temperature detection value and a temperature set value set from the outside.
(2) is compared, and the temperature control output value (3a) is obtained according to the comparison result.
In the temperature control method of controlling the heater (1) using the temperature control output value (3a), the temperature control output value (3a) is stored at predetermined time intervals and the temperature sensor After the disconnection of (5) is detected, the heater (1) is controlled by using the stored value of the temperature control output value (3a) closest to the disconnection. 2. A cylinder temperature control method for an injection molding machine, wherein the temperature of the cylinder is controlled by using a heater (1) and a temperature measuring sensor (5) respectively provided on a plurality of segment cylinders. The temperature control output value (3a) for each predetermined time interval for each cylinder is stored, and the temperature control output value (3a) of the segment cylinder after the disconnection of the temperature measuring sensor (5) is detected, The temperature control output value (3a) most recent to the time of the segment cylinder
The adjustment value (34a) which is the output of the calculation means (34) using the temperature control output value of the segment cylinder adjacent to the segment cylinder and the manually adjusted value (33
A cylinder temperature control method for an injection molding machine, comprising: outputting a total value obtained by adding a) to the heater (1) of the segment cylinder. 3. The temperature detection value is detected from the temperature measurement sensor (5), and the temperature detection value and the temperature set value set from the outside.
(2) is compared, and the temperature control output value (3a) is obtained according to the comparison result.
In the temperature control device for controlling the heater (1) using the temperature control output value (3a), the first switch unit ((1) connected to the heater (1) through the power amplification unit (4) 30)
A disconnection detection circuit (6) connected to the first switch section (30) and the temperature sensor (5), and the first switch section (3)
Control calculation unit (3) connected to (0) and inputting temperature set value (2)
A second switch section (36) which is turned on and off by a timer (37) connected to the control calculation section (3), and each switch section
(30, 36) is provided with a storage unit (35) for storing the temperature control output value (3a) from the control calculation unit (3), and when the disconnection of the temperature measuring sensor (5) is detected Thereafter, the temperature control device is configured to supply the temperature control output value (3a) most recent to the time from the storage unit (35) to the power amplification unit (4). 4. A cylinder temperature control device for an injection molding machine, wherein a heater (1) and a temperature measuring sensor (5) provided on each of a plurality of segment cylinders are used to control the temperature of the cylinder. A first switch section (30) connected to the power switch section (1) via a power amplification section (4);
(30) and disconnection detection circuit connected to the temperature sensor (5)
(6) and the temperature setting value connected to the first switch section (30)
(2) input control calculation unit (3), the control calculation unit (3)
The temperature control output value (3a) from the control calculation unit (3) provided between the second switch unit (36) that is turned on and off by the timer (37) connected to the switch unit and each of the switch units (30, 36). A storage unit (35) for storing, a manual setting means (33) for outputting a manual adjustment value (33a) added to the power amplification unit (4), and an adjacent segment cylinder for outputting an adjustment value (34a) And a calculating means (34) using the temperature control output value of, the temperature control output value (3a) immediately after the time when the disconnection of the temperature measuring sensor (5) is detected, the storage unit (35). ) To the power amplification section (4), the cylinder temperature control device of the injection molding machine. 5. The manual adjustment value (33) is provided in the power amplification section (4).
5. The configuration according to claim 4, wherein a) and the adjustment value (34a) which is the output of the calculation means (34) using the temperature control output value of the adjacent segment cylinder are added. Temperature control device.