JPH08267542A - Analogue signal control device for extrusion molding line - Google Patents

Abstract

PURPOSE: To simply perform the stop control of a plurality of motors corresponding to the input exceeding a warning level to a plurality of input analogue signals in an extursion molding line. CONSTITUTION: The signal from an analogue signal system 100 processing an analogue signal and the warning level from a level setting means 101 are compared by a comparison means 102. The comparison means 102 outputs a warning signal stopping the motor set by a motor stop selecting and setting means 105 when the signal from the analogue signal system 100 exceeds the warning level. An output control means 104 controls the output of the warning signal from the comparison means 102 on the basis of whether the output of the warning signal set by an output presence setting means 103 is present or not.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an analog signal control device for an extrusion molding line, and more particularly to an analog signal control device for an extrusion molding line used for plastic molding of long products and laminates including an extruder.

[0002]

2. Description of the Related Art An extrusion molding line is constructed by, for example, connecting an extruder to a take-up machine. In the extruder, molten plastic is extruded by a screw and the extruded product is taken out by the take-out machine. Have In such an extrusion molding line, a motor, a temperature sensor, a pressure sensor, and the like are arranged in the extruder. The analog signals from the motor, the temperature sensor, the pressure sensor, and the like are input to the operation control device, and the analog input is performed. Based on the signal, the operation control device outputs an analog signal to a motor, a heater or the like to control the operation.

[0003]

However, as the number of extruders arranged in the extrusion molding line increases,
If the number of motors built into the extruder is large, the number of analog input signals from the motor, temperature sensor, pressure sensor, etc. and the number of analog output signals from the operation control device to the motor, heater, etc. will increase. It is strongly desired to provide a technique for operating and controlling these increasing analog signals in a situation suitable for the molding operation in.

The present invention has been made under the above circumstances, and provides an analog signal control device in which a proper alarm output for a plurality of input analog signals and a motor stop control corresponding to the alarm output can be easily performed. With the goal.

[0005]

In order to solve such a problem, the present invention, as shown in the claim correspondence diagram of FIG. 1, uses an analog signal from an extrusion molding line including an extruder in a predetermined signal form. Analog signal system 100 for signal processing
And level setting means 101 for setting an alarm level for a signal from the analog signal system 100, and which motor of the plurality of motors arranged on the extrusion molding line is stopped for which alarm of the analog signal system. The motor stop selection setting means 105 for setting the alarm is compared with the signal from the analog signal system and the alarm level, and when the signal exceeds the alarm level, an alarm for controlling the stop of the motor set by the motor stop selection setting means 105 is set. A comparison means 102 for outputting a signal, an output presence / absence setting means 103 for setting presence / absence of an alarm signal output related to the analog signal, and a presence / absence of the alarm signal output based on the setting by the output presence / absence setting means 103 Output controlled at the output stage from the setting means 101 or the output stage of its alarm signal It is configured by including a control means 104, a.

According to the present invention having such means, the comparing means 102 compares the signal from the analog signal system 100 which processes the analog signal with the alarm level from the level setting means 101, and the analog signal system. When the signal from 100 exceeds the alarm level, an alarm signal for stopping the motor set by the motor stop selection setting means 105 is output, but whether the alarm signal output by the output existence setting means 103 is output or not. Based on the output control means 10
4 outputs and controls the alarm signal. Moreover, this alarm signal is controlled at the output stage from the level setting means 101 or at the output stage of the alarm signal.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a schematic view showing an example of an extrusion molding line for carrying out the analog signal control device according to the present invention. In FIG. 2, the extruder 1 includes an extrusion motor 5 for rotating a main screw (not shown) in a molding machine table 3,
It has a conventionally known configuration having other configurations such as a rotation speed detection sensor 7 that detects the rotation speed of the pushing motor 5. Reference numeral 9 is a cable described later.

The molding machine table 3 is equipped with a hopper 11 for supplying plastic raw materials, a raw material feeder device 13 having an auxiliary screw (not shown) and the like. The raw material feeder device 13 is for a feeder for rotating the auxiliary screw. A motor 15 and a sensor 17 for detecting the number of rotations of the feeder motor 15 are arranged. In the extruder 1, a heater (not shown) is provided in a plurality of sections in which the cylinder portion near the main screw is divided into a plurality of sections in the extrusion direction.
And temperature sensors 19a to 19e for temperature measurement are arranged,
A pressure sensor 2 for measuring resin pressure at the tip die 21 part
3 are arranged.

These extrusion and feeder motors 5,
15, rotation speed detection sensors 7 and 17, temperature sensor 19a
.About.19e and the pressure sensor 23 are connected to the operation control device 25 including the analog signal control device of the present invention by the cable 9 described above. In many cases, a plurality of extruders 1 are provided. Then, the extrusion and feeder motors 5 and 15, the rotation speed detection sensors 7 and 17, and the temperature sensor 1
9a to 19e and analog signals from the pressure sensor 23 are input, and while monitoring by the operation control device 25, the analog signals and digital signals for control are output to the motors 5 and 15 and the heater to operate, and the molded product is extruded. To be done.

FIG. 3 is a block diagram showing an example of an analog signal control device according to the present invention. In FIG. 3, the control circuit 27 includes a CPU 29 which is a main element for achieving the functions described later, a ROM 31 which stores an operation program of the CPU 29, a RAM 33 which temporarily stores data of a calculation process of the CPU 29, and a data input / output. It is formed by having an interface (I / O) 35 and the like for use as a main part of a so-called microcomputer. The display device 37 connected to the control circuit 27 is, for example, a plasma display device formed on the operation surface of the operation control device 25 shown in FIG. 2, and displays a setting screen, a monitor screen, and the like described later.

The setting screen and the monitor screen are displayed on the display device 37 under the control of the control circuit 27 on the basis of layout screen data which is connected to the control circuit 27 and stored in advance in an external storage circuit (not shown). The setting data from each setting device described later is displayed on the screen so as to be overwritten and stored in the external storage circuit. Control circuit 2
The name setting device 39 connected to 7 is a device for setting names for various analog input signals (AI signals), and is composed of a keyboard 41 arranged on the operation surface of the operation control device 25 as shown in FIG. ing.

FIG. 4 shows an AI signal name setting screen. The name corresponding to the channel CH (input terminal) of the analog input signal to be displayed by the input from the name setting device 39, for example, motor 1, current 1, resin pressure 1 , Motor 2, current 2 and resin pressure 2 are set together with the unit. An analog signal measuring device 43, a used channel setting device 47, an alarm setting device 49, an alarm valid / invalid setting device 51, and a motor stop selection setting device 53 are connected to the control circuit 27, like the name setting device 39 described above. Is formed by the keyboard 41. The analog signal measuring device 43 is connected via a filter device 45.

The analog signal measuring device 43 converts an analog signal, which is output from the sensors 19a to 19e, 23 shown in FIG. 2 and which represents physical quantities such as the number of revolutions of the motor, temperature, resin pressure and motor current, into a digital signal. It is D-converted and outputs a pulse signal having a frequency according to its physical quantity, and is connected to the filter device 45. The filter device 45 has a conventionally known digital filter configuration, removes noise, scales the original physical quantity, and controls the control circuit 2.
7 is output.

FIG. 5 shows a setting screen regarding the filter.
In the figure, symbol A is a delay time setting field in the filter device 45, and symbol B is an alarm delay time setting field in the delay device 63, which will be described later, and is set by inputting specific numerical data. The used channel setting device 47 is for setting a channel CH of an analog input signal, is connected to the control circuit 27, and when an unused channel CH is set for a predetermined analog input signal, the corresponding analog input is set. All settings and displays related to signals are disabled.

The setting is performed on the AI system setting screen of FIG. 6, and the non-use / use is set by inputting “0” and “1” in the “CH use” column. The alarm setting device 49 is
The lower limit or the upper limit of the input analog signal and the allowable value of the entire system are set and output to the control circuit 27.

That is, the alarm levels such as the lower limit alarm value, the upper limit alarm value, and the system alarm value, which are set when the analog input signal level deviates beyond a certain limit, are set. The system alarm value is suitable when the manufacturer of the device sets it in advance from the viewpoint of safe operation in consideration of the system as a whole, and the lower and upper alarm values are set by the user within the range of the system alarm value for each molding line. Suitable when setting in the relationship of. As for the lower limit alarm, a standby function may be provided so that the alarm does not operate unless the analog input signal once exceeds the alarm level and reaches the allowable level at the start of operation.

Whether the alarm valid / invalid setting device 51 outputs an alarm signal corresponding to the analog input signal when the analog input signal exceeds the alarm value set by the alarm setting device 49, in other words, The alarm signal output is set to be valid / invalid and is connected to the control circuit 27. The alarm signals include a lower limit, an upper limit and a system alarm (alarm) output, a stop output for stopping the motor, and a display output thereof to the display device 37.

The above-mentioned FIG. 6 is also a screen for setting system setting values. In the “system alarm” field, the system alarm value and the alarm enable / disable input from the alarm setting device 49 and the alarm enable / disable setting device 51 are input. Is set. The “gate” column in FIG. 6 sets the gate time of the measuring device so that the rotational speed of the motor can be accurately measured up to a low rotational speed.

FIG. 7 is an upper limit and lower limit alarm value setting screen, which includes an alarm setting device 49 and an alarm valid / invalid setting device 51.
It is possible to set the lower and upper limit alarm values and valid / invalid of the alarm input from “0”, and “0” indicates that the setting is invalid, and “1” indicates that the setting is valid and the warning signal is output. The motor stop selection setting device 53 connected to the control circuit 27
It sets which alarm of an analog input signal to stop the motors for a plurality of motors 57 described later, and is connected to the control circuit 27. This is set from the viewpoints of safety of the device, prevention of failure, and ensuring of quality of extruded products.

FIG. 8 is a motor stop screen for setting a channel CH of a motor to be stopped when an upper limit alarm signal is generated, and FIG. 9 is a motor stop screen for stopping a motor 57 when a system alarm condition occurs. This is the screen to set.

FIG. 10 is a delay setting screen when the motor is started, and is a screen for setting an alarm delay time in the delay device 61 shown in FIG. A speed command signal output circuit 55 is connected to the control circuit 27 in FIG. 3, and the speed command signal output circuit 55 controls the speed of a plurality of motors 57. For the motor 57, a start confirmation signal is output to the motor 57 (more precisely, the motor control device 59 provided in the motor 57) in order to confirm whether or not the motor 57 can be started before outputting the speed command signal. Then, wait for the input of the start response signal from the motor 57 to start the motor,
Moreover, at the time of starting the motor, a starting current more than the rated current may temporarily flow, and the delay device 61 delays the starting response signal so as not to output an alarm signal for this starting current and outputs it to the control circuit 27. It is supposed to do.

Then, it is possible to set which motor 57 and how much to delay it, which is set by an input to the alarm standby setting screen of FIG. The delay device 63 connected to the control circuit 27 detects whether or not the alarm signal output from the control circuit 27 has continued for a predetermined time or longer, and only when the alarm signal has continued for the predetermined time, it is detected as an alarm signal. Then, the delay device 63 outputs an alarm signal.

The motor stop signal output device 67 outputs a motor stop signal to each motor 57 based on the alarm signal from the delay device 63. In addition, the control circuit 27
In addition to having each of the control functions described above, outputs a speed command signal corresponding to a predetermined rotation speed to the speed command signal output circuit 55 to control the rotation of the motor 57, and has the following functions. .

That is, the digital signal input from the filter device 45 is compared with the upper limit value, lower limit value and system value input by the alarm setting device 49, and if the digital signal exceeds the set value, the upper limit, It has a function of outputting a lower limit alarm signal and a system alarm signal. Further, the output of the upper limit, lower limit alarm signal and system alarm signal is controlled to be output / non-output based on the alarm output valid / invalid setting data by the alarm valid / invalid setting device 51. In this way, the control circuit 27 functions as a comparison means and an alarm signal output control means.

FIG. 11 is a driving monitor screen displayed on the display device 37 during operation of the analog signal control device. In addition to names and the like for each analog input signal, measured values during driving are displayed in a bar graph. . FIG. 12 is a monitor screen that displays an alarm state for each type of AI name set on the AI name setting screen shown in FIG. 5, for example.

Next, the operation of the above-described analog signal control device of the present invention will be described with reference to the operation explanatory diagram of FIG. In addition, illustration of each of the above-described setting devices is omitted. In FIG. 13, the analog input signal from the extrusion molding line is A / D converted by the analog signal measuring device 43, noise is removed by the digital filter 45a of the filter device 45, and scale conversion is performed by the scale conversion circuit 45b. Control circuit 27 (not shown).
The signal is subjected to predetermined signal processing at and displayed on the display device 37.

If the upper limit alarm value, the lower limit alarm value and the system value are set by the alarm setting device 49 of FIG.
The digital signals after the scale conversion circuit and their upper limit alarm value, lower limit alarm value and system alarm value are compared circuit 69-
When the comparison is made at 73 and the upper limit alarm value, the lower limit alarm value and the system alarm value are exceeded, a signal is output from the comparison circuits 69 to 73 and applied to one input terminal of the subsequent AND gates 81 to 85. When the upper limit alarm effective, the lower limit alarm effective and the system effective have been set by the alarm effective / ineffective setting device 51 of FIG. 3, the delay device 61 is a signal from the motor (n) in the AND gates 75 to 79.
When the AND conditions with the delayed signal are satisfied, the setting valid signal is input to the other input terminals of the AND gates 81 to 85.

Therefore, it is possible to set the upper limit alarm valid, the lower limit alarm valid and the system valid under the condition that the motor 57 is activated. The AND gates 81 to 85 output an alarm signal when the AND conditions of both signals from the comparison circuits 69 to 73 and the AND gates 75 to 79 are satisfied, and the alarm signals are output via the delay devices 63, respectively.
Then, while the upper limit alarm and the lower limit alarm are output from the alarm output device 65 to drive the alarm, the motor stop signal output device 67 outputs the motor stop signals, respectively, and these are displayed on the display device 37. FIG.
Reference numerals S1 to S4 in 3 are switches.

The above-described operation based on FIG. 13 is for one motor, but the set channel CH
It may be considered that the same number of motors 57 are provided for a few minutes of the motor 57, and thus illustration and operation description thereof are omitted. Further, in the above description of the operation, the digital signal after the scale conversion circuit is compared with the upper limit alarm value, the lower limit alarm value and the system alarm value, and the alarm signal is given according to the AND condition of the upper limit alarm valid, the lower limit alarm valid and the system valid. The output was controlled.

However, in the present invention, based on the AND condition result of the upper limit alarm value, the lower limit alarm value and the system alarm value signal and the upper limit alarm valid, the lower limit alarm valid and the system valid, the digital signal after the scale conversion circuit and the upper limit alarm are generated. A configuration is also possible in which the output of the alarm signal is controlled by comparing the value, the lower limit alarm value, and the system alarm value. Furthermore, comparison circuits 69 to 73 and AND gates 75 to 79, 81 to 85.
The configuration of is shown for the sake of convenience so that the operation of the control circuit 27 can be easily understood, and is not limited to this.

As described above, according to the present invention, various analog signals are compared with various alarm levels, and when the analog signal exceeds the alarm level, an alarm signal corresponding to the analog signal is output to respond to the alarm signal. The motor selected is then stopped, and the alarm signal output can be controlled based on the setting condition of whether to output the alarm, and the analog signal, alarm level and alarm output are enabled. It is possible to operate by setting any name and level for the invalid setting. Also, if the system alarm value and the upper and lower limit alarm values are set by the level setting means, it is possible to perform the molding operation while ensuring the safety of the entire system, and within the range of the system alarm value, the user can relate to each molding line. Molding operation can be performed within the set upper and lower limit alarm values.

[0032]

As described above, the present invention compares various analog signals with the alarm level, and when the analog signal exceeds the alarm level, the alarm signal stops the motor according to the analog signal. The alarm signal output is controlled based on the setting conditions of whether or not to output the alarm output, so that appropriate alarm output and allocation can be performed for multiple analog input signals. It becomes possible and the motor can be stopped and controlled according to the alarm of the analog signal, and an accurate extrusion molding operation can be easily carried out in the extrusion molding line.

[Brief description of drawings]

FIG. 1 is a claim correspondence diagram corresponding to the claims according to the present invention.

FIG. 2 is a schematic view showing an extrusion molding line in which the analog signal control device of the present invention is used.

FIG. 3 is a block diagram showing an example of a form of an analog signal control device according to the present invention.

FIG. 4 is a setting screen of various setting data set while being displayed on the display means according to the present invention.

FIG. 5 is a setting screen of various setting data set while being displayed on the display unit according to the present invention.

FIG. 6 is a setting screen of various setting data set while being displayed on the display unit according to the present invention.

FIG. 7 is a setting screen of various setting data set while being displayed on the display unit according to the present invention.

FIG. 8 is a setting screen of various setting data set while being displayed on the display unit according to the present invention.

FIG. 9 is a setting screen of various setting data set while being displayed on the display means according to the present invention.

FIG. 10 is a setting screen of various setting data set while being displayed on the display unit according to the present invention.

FIG. 11 is a setting screen of various setting data set while being displayed on the display unit according to the present invention.

FIG. 12 is a setting screen of various setting data set while being displayed on the display means according to the present invention.

FIG. 13 is an operation explanatory diagram illustrating an operation of the present invention.

[Explanation of symbols]

 1 Extruder 3, 15, 57 Motor 7, 17, 19a to 19e, 23 Sensor 27 Control circuit 37 Display device 39 Name setting device 41 Keyboard 43 Analog signal measuring device 45 Filter device 47 Channel setting device 49 Alarm setting device 51 Alarm Valid / invalid setting device 53 Motor stop selection setting device 55 Speed command signal output circuit 57 Motor 61, 63 Delay device 65 Alarm output device 67 Motor stop signal output device 69-73 Comparison circuit 75-79, 81-85 AND gate 100 Analog Signal system 101 Level setting means 102 Comparison means 103 Output presence / absence setting means 104 Output control means 105 Motor stop selection setting means

Front page continuation (72) Inventor Tatsunori Iwama 5-16-6 Kugahara, Ota-ku, Tokyo Rika Kogyo Co., Ltd. (72) Toshihisa Miyaki 5-16-6 Kugahara, Ota-ku, Tokyo Rika Kako Co.

Claims (1)

[Claims] 1. An analog signal system for processing an analog signal from an extrusion molding line including an extruder in a predetermined signal form, level setting means for setting an alarm level for the analog signal, and an analog signal system arranged on the extrusion molding line. A motor stop selection setting means for setting which motor is stopped for which alarm of the analog signal system regarding a plurality of motors, and the analog signal while comparing the signal from the analog signal system with the alarm level Comparing means for outputting an alarm signal for stopping and controlling the motor set by the motor stop selection setting means when the signal from the system exceeds the alarm level; and outputting the alarm signal related to the signal from the analog signal system. Output presence / absence setting means for setting presence / absence, and the alarm signal based on the setting by the output presence / absence setting means. Analog signal control apparatus for extrusion line, characterized by comprising anda output control means for controlling the output whether.