JPH032024A - Control device for analog signal in extrusion molding line - Google Patents

Abstract

PURPOSE:To accurately perform extruding molding operation by comparing an alarm level with the various analog signals and outputting the alarm signal correspondent to the analog signals when the analog signals exceed the alarm level and also perform the output control of the alarm signal on the basis of the preset conditions wherein the alarm output is output or not. CONSTITUTION:The alarm level sent from a level presetting means 101 is compared with the signal sent from an analog signal system 100 for processing an analog sign in a comparing means 102. Together therewith, when the signal sent from the analog signal system 100 exceeds the alarm level, the alarm signal related to the signal thereof is output. An output controlling means 104 outputs and controls the alarm signal on the basis of existence of the alarm signal preset by an output existence presetting means 103. Further this alarm signal is controlled in an output stage sent from the level presetting means 101 or in an output stage of the alarm signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an analog signal control device for an extrusion molding line, and particularly to an analog signal control device for an extrusion molding line including an extruder and used for plastic molding of long objects and laminates. This invention relates to a signal control device.

[Conventional technology]

The extrusion molding line is constructed by connecting a take-off machine to an extruder, for example, and has a configuration in which the extruder extrudes molten plastic with a screw, and the take-off machine takes off the extruded product.

In such an extrusion line, a motor, temperature sensor, pressure sensor, etc. are arranged in the extruder, and analog signals from these motors, temperature sensors, pressure sensors, etc. are input to the operation control device, and these analog signals are Based on the input signal, the operation control device outputs an analog signal to the motor, heater, etc. to control the operation.

[Problem to be solved by the invention]

However, when the number of extruders installed in an extrusion molding line increases or the number of motors built into the extruders increases, the number of analog signals from the motors, temperature sensors, pressure sensors, etc., and the number of analog signals from the operation control device Since the number of output signals to the molds, heaters, etc. increases, there is a strong demand for a technology to operate and control these increasing analog signals during molding operation in an extrusion line.

The present invention was made under these circumstances.

It is an object of the present invention to provide an analog signal control device capable of appropriately outputting and allocating a W signal to a plurality of input analog signals and facilitating extrusion molding operation.

[Means to solve the problem]

In order to solve these problems, the present invention provides an analog signal system 100 that processes analog signals from an extrusion molding line including an extruder in a predetermined signal format, as shown in the diagram corresponding to claims in FIG. .

Level setting means 101 sets an alarm level for the signal from the analog signal system 100, compares the signal from the analog signal system with the alarm level, and when the signal exceeds the alarm level, sets the signal from the analog signal system 100. a comparison means 102 for outputting an alarm signal related to the analog signal; an output presence/absence setting means 103 for setting whether or not to output an alarm signal regarding the analog signal; Output control means 104 that controls at the output stage from the level setting means 101 or the output stage of the alarm signal;
It is configured with the following.

One aspect of the present invention is that the signal from the analog signal system is a rotational speed signal from a motor placed in the extrusion molding line.
The above-mentioned alarm level can be configured to include a permissible rotation speed level related to the rotation speed of the motor, and the above-mentioned alarm signal can be configured to include an alarm signal regarding the motor.

[For production]

In the present invention equipped with such means, the signal from the analog signal system 100 that processes analog signals and the alarm level from the level setting means 101 are compared by the comparing means 102, and the signal from the analog signal system 100 is compared with the alarm level from the level setting means 101. When a signal exceeds the alarm level, an alarm signal related to the signal is output, and the output control means 104 controls the output of the alarm signal based on whether the alarm signal is output or not, which is set by the output presence/absence setting means 103.

Furthermore, this alarm signal is controlled at the output stage from the level setting means 101 or at the output stage of the alarm signal.

Furthermore, if the signal from the analog signal system is a rotational speed signal from a motor, an alarm signal regarding that motor is output.

〔Example〕

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

FIG. 2 is a schematic diagram showing an example of an extrusion molding line implementing the analog signal control device according to the present invention.

In the figure, the extruder 1 has a main screw in the molding machine table 3.
It has a conventionally known configuration including an extrusion motor 5 that rotates the extrusion motor 5 (not shown), a rotation speed detection sensor 7 that detects the rotation speed of the extrusion motor 5, and other components.

Reference numeral 9 indicates a cable which will be 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 a sub-screw (not shown), etc., and the raw material feeder device 13 includes a feeder motor 15 for rotating the sub-screw. A sensor 17 for detecting the rotation speed of the feeder motor 15 is arranged.

In the extruder 1, heaters (not shown) and temperature sensors 19a to 19e for temperature measurement are installed in multiple sections in which the cylinder near the main screw is divided into multiple sections in the extrusion direction.
is arranged, and a pressure sensor 23 for measuring resin pressure is arranged at the tip end die 21 portion.

These extrusion and feeder motors 5, 15° rotation speed detection sensor 7.17. The temperature sensors 19a to 19e and the pressure sensor 23 are connected to an operation control device 25 including the analog signal control device of the present invention by the cable 9 described above. Note that a plurality of extruders 1 are often provided.

Extrusion and feeder motors 5.15, rotation speed detection sensors 7.17. Analog signals from the temperature sensors 19a to 19e and the pressure sensor 23 are input, and the motors 5, 15 and the heater are operated by outputting control analog signals and digital signals while being monitored by the operation control device 25.

The molded product is extruded.

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

In the figure, the control circuit 27 includes a CPU 29, which is the main element for achieving the functions described later, a ROM 31 that stores an operating program for the CPU 29, a RAM 33 that temporarily stores data in the calculation process of the CPU 29, and a RAM 33 for data input/output. It is formed with an interface (Ilo) 35 and the like, and is the 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, etc., which will be described later. be.

These setting screens and monitor screens are displayed on the display device 37 under the control of the control circuit 27 based on layout screen data that is connected to the control circuit 27 and stored in advance in an external storage circuit (not shown). The setting data from the device will be displayed on the screen, overwriting it.
Stored in an external storage circuit.

The name setting device 39 is connected to the control circuit 27.

This 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.

Figure 4 shows the AI signal name setting screen.3 Name setting device 3
Name 2 corresponding to the channel CH (input terminal) of the analog input signal displayed by input from 9, for example, motor 1. Current 1. Resin pressure 1. Motor 2. The current 2, resin pressure 2, etc. are set together with the unit.

The control circuit 27 includes an analog signal measuring device 43° and a channel setting device 47. Alarm setting device 49° alarm valid/
An invalidation setting device 51 and a motor stop selection setting device 53 are connected, and are formed by a keyboard 41 similarly to the name setting device 39 described above. Analog signal measuring device 43 is connected via filter device 45 .

The analog signal measuring device 43 includes the sensor 19 shown in FIG.
A/D converts analog signals output from a to 19e, 23, etc. that indicate physical quantities such as motor rotation speed, temperature, resin pressure, and motor current into digital signals, and outputs a pulse signal with a frequency corresponding to the physical quantity. It is connected to the filter device 45.

The filter device 45 has a conventionally known digital filter configuration, and removes noise and performs scale conversion to the original physical quantity and outputs it to the control circuit 27 .

FIG. 5 is a setting screen related to the filter, and the symbol A in FIG. 2 is the setting temperature for the delay time in the filter device 45, and the symbol B is the setting field for the alarm delay time in the delay device 63, which will be described later, with specific numerical data. is set by the input.

The used channel setting device 47 sets a channel CH of an analog input signal, and is connected to the control circuit 27, and when an unused channel CH is set for a predetermined analog input signal.

All settings and displays related to the corresponding analog input signal are disabled.

Settings are made on the AI system setting screen shown in Figure 6.

By inputting rOJ and rlJ in the "rCH use" column, non-use/use is set.

The alarm setting device 49 sets a lower limit or upper limit permissible value and a value permissible in relation to the entire system for the input analog signal, and outputs the set value to the control circuit 27 .

That is, alarm levels such as a lower limit alarm value, an upper limit alarm value, and a system alarm value are set when the analog input signal level deviates beyond a certain limit. The system alarm value is suitable when the equipment manufacturer takes the entire snowmaking system into consideration and sets it from the standpoint of safe operation, while the lower and upper alarm values are set by the user in relation to individual forming lines. suitable for

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 permissible level at the start of operation.

The alarm enable/disable setting device 51 determines whether or not to output 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. It is used to set validity/invalidity and is connected to the control circuit 27.

The alarm signals include a lower limit, an upper limit, a system alarm (alarm) output, a stop output to stop the motor, and a display output of these to the display device 37.

Figure 6 above is also the system setting value setting screen,
The system alarm value and the validity/invalidity of the alarm inputted from the alarm setting device 49 and the alarm enable/disable setting device 51 are input and set in the "system alarm" field.

Note that the "Gate" column in FIG. 6 is for setting the gate time of the measuring device so that the rotation speed of the motor can be accurately measured up to low rotation speeds.

FIG. 7 shows the upper limit and lower limit alarm value setting screen, and it is possible to set the lower limit and upper limit alarm values input from the alarm setting device 49 and the alarm enable/disable setting device 51 and enable/disable the alarm. , "0" indicates that the setting is invalid, and "1" indicates that the setting is valid, which instructs the output of an alarm signal.

Motor stop selection setting device 53 connected to control circuit 27
is connected to the control circuit 27 and is used to set which WIH of the analog input signal is to be used to stop the motor for a plurality of motors 57, which will be described later. This is set from the viewpoint of equipment safety, prevention of failure, and quality assurance of one extrusion molded product.

Figure 8 shows that when a situation that generates an upper limit alarm signal occurs,
This is a motor stop screen for setting the channel CH of the motor to be stopped, and FIG. 9 is a screen for setting the motor 57 to be stopped when a system alarm state occurs.

FIG. 10 shows the delay setting screen when starting the motor.

This is a screen for setting the alarm delay time in the delay device 61 shown in FIG.

The control circuit 27 in FIG. 3 includes a speed command signal output circuit 55.
is connected, and the speed of a plurality of motors 57 is controlled by this speed command signal output circuit 55.

For the motor 57, before outputting the speed command signal, a start confirmation signal is output to the motor 57 (more precisely, to the motor control device 59 provided in the motor 57) in order to confirm whether or not the motor 57 can start. However, the motor waits for the input of a start response signal from the motor 57 before starting, and when the motor is started, a starting current higher than the rated current may temporarily flow.
The activation response signal is delayed by a delay device 61 and output to the control circuit 27 so as not to output an alarm signal in response to this activation current.

It is possible to set how much delay is to be applied to which motor 57, and is set by inputting to the alarm standby setting screen shown in FIG. 10.

The delay device 63 connected to the control circuit 27
It detects whether the alarm signal output from 7 continues for a predetermined time or more, and only when it continues for a predetermined time, it is detected as an alarm signal. The delay device 63 outputs an alarm signal.

The motor stop signal output device 67 outputs a motor stop signal to each motor 57.

In addition to having each of the control functions described above, the control circuit 27 outputs a speed command signal corresponding to a predetermined rotational speed to the speed command signal output circuit 55 to control the rotation of the motor 57, and also has the following functions. have.

That is, the digital signal input from the filter device 45 is compared with the upper and lower limit values and system values input and set by the alarm setting device 49, and if the digital signal exceeds the set values, the upper and lower limit alarm signals are output. It also has the function of outputting a system alarm signal. Furthermore, the upper limit,
Output/non-output of the lower limit value WIla signal and the system alarm signal is controlled based on the alarm output enable/disable setting data by the alarm enable/disable 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 an operation monitor screen displayed on the second display device 37 when the analog signal control device is in operation, and in addition to the names of each analog input signal, the measured values during operation are displayed in a half graph.

FIG. 12 is a monitor screen that displays an alarm state for each type of each A1 name set on the AI name setting screen shown in FIG. 5, for example.

Next, the operation of the analog signal control device of the present invention described above will be explained using the operation explanatory diagram of FIG. 13. Note that illustration of each setting device described above is omitted.

In the figure, an analog input signal from an extrusion molding line is A/D converted by an analog signal measurement device 43, noise is removed by a digital filter 45a of a filter device 45, and the scale is converted by a scale conversion circuit 45b to restore the original signal. The signal is returned to a physical quantity, subjected to predetermined signal processing in the control circuit 27, and displayed on the display device 37.

The upper limit alarm value is set by the alarm setting device 49 in FIG.

If the lower alarm value and system value are set.

The digital signals after the scale conversion circuit, their upper limit alarm value, lower limit alarm value and system alarm value are compared to the comparison circuit 69~
73, and when the upper limit alarm value, lower limit alarm value and system alarm value are exceeded, a signal is output from AND gates 75 to 79 and applied to one input terminal of AND gates 81 to 850.

When the upper limit alarm enable, lower limit alarm enable and system enable are set by the alarm enable/disable setting device 5I in FIG. When the AND conditions with the delayed signal are met in 61, the setting valid signal becomes AN
It is input to the other input terminal of D gates 81-85.

Therefore, under the condition that the motor 57 is activated, the upper limit vr
It is possible to set alarm enable, lower limit alarm enable, and system enable.

AND gates 81 to 85 connect comparison circuits 69 to 73 and A
When the AND conditions of both signals from ND gates 75 to 79 are met, an alarm signal is output, and each alarm signal is output via delay device 63.

The upper limit alarm and lower @ alarm are outputted from the alarm output device 65 and the alarm is driven, while motor stop signals are outputted from the motor stop signal output device 67 and displayed on the display device 37.

Note that the symbols 81 to S4 in FIG. 13 are switches.

The operation based on FIG. 13 described above is the operation of one motor, but if you consider that the motors 57 for the set number of channels are configured by providing a plurality of the same configurations, the two diagrams and operations may be used. The explanation will be omitted.

In addition, in the above operation explanation, 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 then the alarm signal is generated by ANDing the upper limit alarm valid, the lower limit alarm valid, and the system valid. The configuration was to control the output of

However, in the present invention, based on the AND condition result of the upper floor alarm value, lower limit alarm value, and system alarm value signal, upper floor alarm valid, upper floor alarm valid, and system valid, the digital signal after the scale conversion circuit and the upper limit 'M alarm value A configuration is also possible in which the lower limit alarm value and the system alarm value are compared and the output of the alarm signal is controlled.

Furthermore, comparison circuits 69 to 73 and AND gates 75 to 79
．． The configurations 81 to 85 are shown for convenience and to make the operation of the control circuit 27 easier to understand, and are not limited thereto.

In this way, the present invention compares various analog signals with various alarm levels, and when the analog signal exceeds the vI alarm level, outputs an alarm signal corresponding to the analog signal, and also outputs the alarm. It is possible to control the output of the alarm signal based on the setting conditions of whether or not the alarm signal is active, and it is possible to operate the alarm signal by setting the name and level arbitrarily for the analog signal, alarm level, and enable/disable setting of the alarm output. I can do it.

〔Effect of the invention〕

As explained above, the present invention compares various analog signals with the alarm level, and when the analog signal exceeds the alarm level, outputs a 'H multiplier signal corresponding to the analog signal, and outputs the alarm. Since the configuration allows the output of the alarm signal to be controlled based on the setting conditions of whether or not to Extrusion molding operation can be easily carried out.

When the analog signal is a signal related to a motor disposed on an extrusion molding line, it is possible to carry out accurate and stable extrusion molding operation while ensuring safe operation of the motor.

[Brief explanation of drawings]

FIG. 1 is a claim correspondence diagram corresponding to the claims of the present invention, FIG. 2 is a schematic diagram showing an extrusion molding line in which the analog signal control device of the present invention is used, and FIG. 3 is an analog diagram of the present invention. A block diagram showing one embodiment of the signal control device, FIGS. 4 to 12 are setting screens for various setting data that are set while being displayed on a display means, and FIG. 13 is a detailed explanation of the present invention. FIG. 1・・・・・・・・・・・・・・・・・・Extruder 3.15.57・・・Motor

Claims (2)

[Claims] (1) An analog signal system that processes analog signals from an extrusion molding line including an extruder in a predetermined signal format, a level setting means that sets an alarm level for the analog signal, and a signal from the analog signal system. Comparing means for comparing the alarm levels and outputting an alarm signal related to the signal from the analog signal system when the signal from the analog signal system exceeds the alarm level; and the alarm signal related to the signal from the analog signal system. An extrusion molding line characterized by comprising: an output presence/absence setting means for setting the presence/absence of output of the alarm signal; and an output control means for controlling whether or not the alarm signal is output based on the setting by the output presence/absence setting means. analog signal control device. (2) The signal from the analog signal system includes a rotation speed signal from a motor disposed in the extrusion molding line, and the alarm level includes a permissible rotation speed level related to the rotation speed of the motor, and the alarm signal 2. The analog signal control device for an extrusion line as claimed in claim 1, wherein includes an alarm signal related to the motor.