JPH0657422B2 - Motor start control device for extrusion molding line - Google Patents

Description

The present invention relates to a motor start control device for an extrusion molding line, and
In particular, it relates to improvement of a motor start-up control device in an extrusion molding line used for plastic molding of a laminate or a long product including an extrusion molding machine.

[Conventional technology]

For example, an extrusion molding line for extruding a laminate 1 such as a plastic sheet, as shown in FIG. 7, connects a plurality of extruders 3, 5, 7 with a single take-up machine 9 and Screws provided inside the machines 3, 5 and 7 (not shown)
The plastic raw material is melted and extruded by, and the molten plastic raw material is laminated by the laminating die 8 and the laminate 1 is taken by the take-up machine 9.

Such extruders 3, 5 and 7 have motors 3a, 5a and 7a for rotationally driving a screw, and a cylinder (not shown) part is divided into a plurality of sections by a heater for the temperature of each section. Under the condition that the temperature of the lamination die 8 at the tip of the extruder is heated by a heater (all are not shown), the screw is rotationally driven to perform the extrusion molding operation.

Therefore, at the time of starting the operation of the extruders 3, 5, and 7, the temperature of each section and a predetermined portion such as the laminating die 8 is increased while measuring the temperature with the temperature sensors 3b, 5b, 7b, and 8a.
It is necessary to start the extrusion molding operation after the temperature adjustment, that is, the temperature rise is completed, and the motors 3a, 5a, 7a, the temperature sensors 3b, 5b, 7b, 8a, the motor start control device 1
The start and operation are controlled by 1.

Conventionally, the motor start-up control device 11 of the extrusion molding line includes the temperature sensors 3b, 5b, 7b and 8a and the motors 3a and 5a.
If the temperature sensors 3b, 5b, 7b, 8a of all the extruders 3, 5, 7 have not completed the temperature rise detection because of the small number of points a, 7a, the motors 3a, 5a, 7a.
Had a circuit configuration that did not start.

In addition, when the motors 3a, 5a, 7a are started, FIG.
As shown in C to C, the motor start control device 11 can output the start signal to the motors 3a, 5a, 7a after the temperature rise is completed, and receives the start confirmation signal from the motors 3a, 5a, 7a. Later, the speed command signal is sent to the motors 3a, 5a, 7a.
It was configured to output to and actually start rotation.

[Problems to be Solved by the Invention]

However, the motor start control device 11 having the above-described configuration
However, it had the following problems.

That is, since the motors 3a, 5a, 7a do not start unless all the temperature adjustments of the installed extruders 3, 5, 7 are completed, for example, one or two of the extruders 3, 5, 7 are used. When it is necessary to operate only some of the machines mentioned above, the temperature of all the extruders 3, 5 and 7 should be raised to adjust the temperature, or only the required extruders 3, 5 and 7 should operate. It is necessary to change the circuit configuration.

Therefore, some of the extruders 3, 5, 7 that are not used have to be heated, which is uneconomical from the viewpoint of energy saving, and it is complicated to deal with various extrusion moldings.

In addition, such a problem is that if the extruder has multiple feeder screws that supply plastic raw materials in addition to the screw for extrusion molding, some extruder screws can be used even with one extruder. When not doing, the same problem occurs.

Further, when the motors 3a, 5a, 7a are started, the start control device 11 outputs a start signal to the motors 3a, 5a, 7a,
Since the speed command signal is output after receiving the start confirmation signal from the motors 3a, 5a, 7a, for some reason,
When the speed command signal is already output at the time of outputting the start signal, when the start confirmation signal is received from the motors 3a, 5a, 7a, the motors 3a, 5a, 7a are suddenly started and the motor 3a, Extruder 3a as well as 5a and 7a
5 and 7 failures and molding defects are likely to occur.

The present invention has been made to solve the conventional drawbacks at the time of starting such a motor, and when the temperature adjustment of a preset temperature control target group is completed, the start of the motor related to the temperature control target is started. It is an object of the present invention to provide a motor start-up control device capable of performing the above.

Another object of the present invention is to provide a motor start-up control device in which the motors of the start-up group related to the temperature control target are started when the temperature control of any temperature control target group is completed by grouping those motors into the start-up group. .

A further object of the present invention is to provide a motor start-up control device that prevents malfunctions when the motor is started up.

[Means for Solving the Problems]

In order to solve such a problem, the present invention provides a variable speed motor 100, a plurality of temperature control objects 101, and a plurality of temperature measurement objects arranged in the temperature control object 101, as shown in the claim correspondence diagram of FIG. It comprises a means 102, a controlled object grouping means 103, a detecting means 104, and a starting means 105.

The temperature control target 101 is a heater or the like related to the operation of the motor 100 arranged in an extrusion molding line including an extrusion molding machine, and the temperature measuring means 102 measures the temperature of the temperature control target 102. Conversion means 10
3 is for selecting an arbitrary temperature control target from the temperature control targets 101 and grouping it into one or more.

The detection means 104 detects the completion of all temperature adjustments in the temperature control target group, and the start means 105
Is to start the motor 100 related to the temperature control target 101 whose temperature control is completed based on the result of the temperature control completion by the detection means 104.

In addition, the present invention is to group a plurality of the above-mentioned motors 100 into a start-up group and to group the motors 1 into the start-up group.
00 and the control target group have a correspondence relationship setting means 107 for setting the correspondence relationship, and the detection means 104 can be configured to detect each control target group.

Further, the present invention checks whether or not a speed command signal is already output to the motor 100 to be started at the start of the start by the starting means 105, and when the speed command signal is output, the motor start is started. It can be configured by including an inspection unit 106 that does not output a signal.

[Work]

In the present invention provided with such means, when the temperature control target 101 is grouped by the temperature control target 101 by the control target grouping means 103, the detection means 104 completes all temperature adjustments in the temperature control object group. Whether or not the temperature control is completed is detected, and the activation means 105 activates the motor 100 related to the temperature control target 101 for which the temperature control is completed based on the temperature control completion result by the detection means 104.

Further, in the configuration including the correspondence relationship setting means 107, the plurality of motors 100 are grouped into the activation groups, and the detection means 1
At 04, it is detected whether or not all temperature adjustments of the temperature control target 101 are completed for each activation group, and the activation means 105 activates the motors of the activation group.

Further, in the configuration including the inspection means 106, the motor 1 to be activated when the activation means 105 starts the activation.
If the speed command signal is already output, the inspecting means 106 inspects whether or not the speed command signal is already output at 00, and if the speed command signal is output, the start signal is not output even if the start command is issued.

〔Example〕

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

FIG. 2 is a block diagram showing an embodiment of the motor start control device according to the present invention.

The configuration of the extrusion molding line using the motor start-up control device of FIG. 2 is the same as that of FIG. 7 described above, for example.

That is, each of the plurality of extruders 3, 5, 7 has a motor 3a, 5a, 7a for rotationally driving a screw (not shown), divides the cylinder portion into a plurality of sections in the extruder direction, and controls the temperature of each section. While heating with a heater and heating the temperature of the laminating die 8 at the extruding tip with a heater (both not shown), each screw is rotationally driven, and the plastic raw material is melt-extruded and molded by these screws.
The stacking die 8 is used for stacking, and the single extruding machine 9 takes out the extruded product.

Each section of the extrusion molding machines 3, 5, 7 and the laminating die 8 are heated while temperature is measured by the temperature sensors 3b, 5b, 7b, 8a, and the extrusion molding operation is performed after the temperature is completed.

The motor start control device 11 includes the motors 3a, 5a,
7a, temperature sensors 3b, 5b, 7b, 8a, motors, etc. are started and controlled, and are connected by cables or the like.

Returning to FIG. 2, the control circuit 13 as a control means includes a CPU 15 which is a main achievement means of each function described later, and a ROM 17 which stores an operation program of the CPU 15.
And a RAM 19 for temporarily storing data of the calculation process of the CPU 15 and a data input / output interface (I
/ O) 21 and the like, and is a main part of a so-called microcomputer.

A master-slave relationship setting device 23, a mode switching device 25, a controlled object grouping device 27, and a correspondence relationship setting device 29 are connected to the control circuit 13, and are formed by, for example, a keyboard 31 formed on the operation surface of the device body. . Details will be described later.

A master-slave relationship storage circuit 33, a controlled object group storage circuit 35, and a correspondence relationship storage circuit 37 are connected to the control circuit 13, and these divide a storage area in an external storage circuit 39 as a storage means including a RAM. used.

The display device 41 connected to the control circuit 13 is, for example, a plasma display device that displays input / output data and the like.

The temperature measuring device 43 measures the temperature of a temperature controlled object 45 such as a heater under the control of the control circuit 13, and includes the temperature sensors 3c, 5c, 7c shown in FIG. 7, and the temperature sensors 3c, 5c, The analog signal corresponding to the measured temperature from 7c is converted into a digital signal and output to the control circuit 13 as a measured temperature signal, which forms a temperature measuring means.

Note that the temperature sensors 3c, 5c, 7c in FIG.
5 and temperature sensors 3c, 5c, 7c.

Under the control of the control circuit 13, the speed command device 47 converts a digital speed command signal from the control circuit 13 into an analog signal and outputs it to the motors 3a, 5a, 7a.
The illustration of the motors 3a, 5a, 7a in FIG. 7 is also for convenience, and there are many motors as shown in FIG. 3 described later.

The start confirmation device 49 outputs a start inquiry signal to the motors 3a, 5a, 7a under the control of the control device 13, while the start confirmation signals from the motors 3a, 5a, 7a are output to the control device 13.
The start-up confirmation device 49, the control device 13 and the speed command device 47 form a start-up means.

The mode switching device 25 sets whether or not the motor start control device 11 controls each of the motors 3a, 5a, 7a in the independent operation or the ratio operation mode. And automatic mode selection is possible.

Under the control of the control circuit 13, the manual mode in the single operation mode is a part of the keyboard 31, and the motors 3a, 5 are driven at the rotation speed input from a rotation speed input device (not shown).
a, 7a are individually controlled, and the automatic mode is for automatically controlling each motor 3a, 5a, 7a individually under the control of the control circuit 13 by the rotation speed input in advance from the rotation speed input device.

The ratio operation mode is a rotation speed signal input from the rotation speed input device for the main motor under the control of the control circuit 13,
For the slave motors, a ratio calculation is performed at a predetermined ratio from the number of revolutions of the master motor to which the slave motors depend, and the respective motors 3a, 5 are
The rotation speeds of a and 7a are controlled.

The master-slave relationship setting for each motor 3a, 5a, 7a will be described later.

The master-slave relationship setting device 23 changes the master-slave relationship of which of the motors is the master motor and which is the slave motor for the master motor, and forms a master-slave relationship setting means together with the control device 13. Under the control of the control circuit 13, the master-slave relationship storage circuit 33 stores the master-slave relationship.

Regarding the master-slave relationship, a configuration in which a plurality of motors are used as master motors and one or more slave motors are subordinate to each master motor,
A configuration in which another slave motor is slaved to a slave motor that is slaved to the main motor is optional, and for example, as shown in FIG. 3, all the motors in the extrusion molding line (motors CH1 to CH1 in FIG. 3).
For CH12), the motor for which the column of the main motor is "0" is set as the main motor, and the motor for which "1" is set as the sub motor of the main motor 1. That is, FIG. 3 is a master-slave relationship table.

The correspondence relationship setting device 29 controls the motors (motors CH1 to CH in FIG. 3) to be activated simultaneously under the control of the control circuit 13.
12) The startup group is set, and the startup group and the temperature control target group (described later) are arbitrarily associated with each other, and are stored in the correspondence relationship storage circuit 37 and displayed as shown in FIG. It has become.

For example, when the motors CH1, 3, 5 are designated as the start-up group 1, the master-slave motors CH1, CH subordinate to the start-up group 1 are designated.
2, CH3 and CH5 are automatically designated. That is, FIG. 3 is a start-up group table as well as a master-slave relationship table.

The controlled object grouping device 27 arbitrarily groups each temperature controlled object 45 into one or more under the control of the control circuit 13, and the temperature controlled objects belonging to each group are stored in the controlled object group storage circuit 35. It is designed to be remembered.

FIG. 4 is a so-called temperature rise completion table showing the setting status of the control target group, and the temperature control target (temperature control board) designated by “1” forms one group.

That is, the temperature control board has a plurality of individual temperature control targets, and for the motor CH1, the temperature control boards 1, 3,
5, the temperature control board 1 for the motor CH2, the temperature control boards 2, 4, 6 for the motor CH3, the motor CH
As for No. 5, the temperature control boards 3, 5, and 7 are the temperature control target groups.

When the start operation is instructed while the mode switching device 25 is selecting the ratio operation mode, the control device 13 stores the master-slave relationship memory circuit 33 and the correspondence relationship memory circuit (37) shown in FIG. Referring to the master-slave relationship table and the starting group table, the motors belonging to the starting group (CH1 to CH in FIG. 3)
12), while the control target group storage circuit (3
5) Refer to the temperature increase completion table (Fig. 4) to confirm this and detect whether or not all measured temperature signals of all temperature control targets corresponding to the startup group exceed the temperature increase completion temperature. Has a detection function.

The control device 13 detects the completion of temperature rise when there is a motor start command, outputs a start signal from the start confirmation device 49 to all the motors (CH1 to CH12 in FIG. 3) belonging to the start group, and each motor ( When a start confirmation signal from CH1 to CH12 in FIG. 3 is input through the start confirmation device 49, it has a function of outputting a speed instruction signal to the speed instruction device 47.

Further, the control device 13 inspects whether or not the speed command device 47 is outputting the speed command signal when outputting the start signal via the start confirmation device 49, and if the speed command device 47 is outputting the speed command signal. It has an inspection function that does not output a start signal.

After the speed command signal is properly output from the speed command device 47, the speed of each motor is controlled according to the single operation or ratio operation mode condition.

The motor start-up control device 11 of the present invention configured as described above
Will become more apparent by the description of the startup control operation with reference to the flowcharts shown in FIGS. 5 and 6.

When the program starts the activation of the motor n in the state where the mode switching device 25 is set to the ratio operation mode, the control device 13 causes the master-slave relationship storage circuit 33 and the correspondence relationship storage circuit 37 to start the master-slave relationship table and the startup group in step 200. Read the table and check the startup group for motor n,
In step 201, the control device 13 confirms the motors that belong to the same startup group m as the motor n. Reference numeral n is the number of motors CH1 to CH12 in FIG. 3, and reference numeral m is the starting group number.

In the following step 202, the control device 13 reads the temperature increase completion table from the control target group storage circuit 35 and confirms the temperature increase completion table, and in step 203, the control device 13 obtains all temperature measurement data regarding all motors belonging to the activation group m. In step 204, the control device 13 determines whether or not the temperature raising of all temperature raising points is completed.

If YES in step 204, the control device 13 causes the activation confirmation device 49 and the speed command device 47 to operate in step 205.
To move to the start processing of all the motors of the start group m, and when step 204 is NO, in step 206, the control device 13 displays on the display device 41 that the motor cannot be started and ends. .

FIG. 6 particularly shows the starting process of the motor. In step 300, the control device 13 inspects and judges whether or not the speed command signal is already output from the speed command device 47 to the motor.
When step 300 is NO, in step 304 the start confirmation device 49 outputs a start signal to the motor, and when the control device 13 receives the confirmation signal from the motor, the speed command device 47.
Is instructed to output a speed command signal to the motor, and the process ends.

If YES in step 300, the control device 13 stops the output of the speed command signal to the speed command device 47 in step 301, and after the waiting time in step 302, the speed command device 47 outputs the speed command in step 303. It is judged again whether or not the signal is output, and step 30
If 3 is NO, the process proceeds to step 305 to perform the above-described start-up processing, and if YES in step 303, the control device 13 performs an error display process on the display device 41 in step 304 and ends.

In the above-described embodiment, the extrusion molding line is equipped with a plurality of extruders, but the present invention can be implemented in an extrusion molding line equipped with one extruder.

〔The invention's effect〕

As described above, in the motor start-up control device of the present invention, the temperature control targets arranged in the extrusion molding line including the extruder are grouped by the control target grouping means, and the temperature control of the grouped temperature control targets is completed. Is detected by the detecting means, and the motor related to the temperature control target is started by the starting means based on the detection result. Therefore, if the temperature adjustment of any preset temperature control target group is completed, the setting is performed. It is possible to start any motor without performing temperature raising processing of temperature control objects other than the above temperature control objects, which is economical and the operation when changing the extrusion molding line is simple.

Further, in the configuration provided with the correspondence relationship setting means for grouping the motors into the start groups and setting the correspondence relationship with the temperature control target groups, the temperature control target groups corresponding to those start groups belong to the start group due to the completion of temperature adjustment. The motor can be started at once.

Further, in the configuration having the detection means, the motor is started in a state where the output of the speed command signal is always stopped, so that the malfunction at the time of starting the motor is prevented and the extrusion molding line is less likely to be damaged.

[Brief description of drawings]

FIG. 1 is a claim correspondence diagram corresponding to the claims according to the present invention, FIG. 2 is a block diagram showing an embodiment of a motor start control device according to the present invention, and FIGS. 3 and 4 show the present invention. Fig. 5 shows an example of setting the start grouping relation of each motor and grouping of temperature control targets in the display device of Fig. 2, Fig. 5 and Fig. 6 are flow charts for explaining the operation of the present invention, Fig. 7 FIG. 8 is a schematic diagram showing an example of an extrusion molding line including a motor start-up control device, and FIG. 8 is a diagram explaining a motor start-up operation. 1 ... Laminated product (molded product) 3-7 ... Extrusion molding machine 3a-7a ... Motor 3b-3b, 8a ... Temperature sensor 9 ... Take-up machine 11 ... Motor start control device 13 ... Control device 15 ...... CPU 23 ...... Master-slave relationship setting device 25 ...... Mode switching device 27 ...... Control target grouping device 29 ...... Correspondence relationship setting device 31 ...... Keyboard 33 ...... Master-slave relationship storage circuit 35 ...... Control target group storage circuit 37 ... Correspondence storage circuit 39 ... External storage circuit 41 ... Display device 43 ... Temperature measurement device 45 ... Temperature control target (cylinder, laminated die) 47 ... Speed command device 49 ... Startup confirmation device 100 ... ... Motor 101 ... Temperature control target 102 ... Temperature measuring means 103 ... Control object grouping means 104 ... Detecting means 105 ... Starting means 106 ... Inspecting means 07 ...... correspondence relationship setting means

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kikuchi Main tax 5-16-6 Kugahara, Ota-ku, Tokyo Rika Kogyo Co., Ltd. (72) Toshihisa Miyagi 5-16-6 Kugahara, Ota-ku, Tokyo Rika Kogyo Within the corporation (56) Reference JP-A-2-300008 (JP, A) JP-A-59-63999 (JP, A) JP-A-2-270529 (JP, A)

Claims (3)

[Claims] 1. A motor arranged in an extrusion molding line including an extrusion molding machine, a plurality of temperature control objects arranged in the extrusion molding line and related to the operation of the motor, and the temperature of the temperature control object is measured. A plurality of temperature measuring means, a control object grouping means for selecting an arbitrary temperature control object from the temperature control objects and grouping the temperature control objects into one or more, and a total temperature adjustment of the grouped temperature control objects is completed. An extrusion molding line comprising: a detection means for detecting that the temperature control is completed based on a result of completion of temperature control by the detection means; Motor start control device. 2. A detection means, comprising: a plurality of the motors; and a correspondence relationship setting means for setting a start-up group of these motors and setting a correspondence relationship between the start-grouped motors and the control target group. The motor starting control device of the extrusion molding line according to claim 1, wherein is detected for each control target group. 3. At the start of starting by the starting means, it is checked whether or not a speed command signal has already been output to the motor to be started, and the motor start signal is output when the speed command signal is output. The motor start-up control device for an extrusion molding line according to claim 1 or 2, further comprising an inspection means that does not allow the inspection.