JP2003001696A - Operation control device of extrusion-molding device and operation control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation control device, of a resin extrusion-molding device, which is capable of satisfactorily controlling the operation when two filters are installed and also an operation control method. SOLUTION: During molding, the rotary speed of a second gear pump (25) is set at a set speed level and the operating speeds of a raw material feeder (21), an extruder (22) and a first gear pump (23) are controlled in a feedback mode so that the pressure before the second gear pump (25) is set at a set pressure level. In addition, during starting the operation and changing a discharge volume, the operating speeds of the first and the second gear pump (23 and 25) are feedback controlled respectively so that the pressure before the first and the second gear pump (23 and 25) are set at a set pressure level. When the operating speed of the second gear pump (25) reaches a set speed level, the operating speed of the second gear pump (25) is set at a set speed level and the raw material feeder (21), the extruder (22) and the first gear pump (23) are feedback controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extruder molding apparatus, and more particularly to an operation control apparatus and method for a resin extrusion molding apparatus.

[0002]

2. Description of the Related Art Conventionally, as an extrusion molding apparatus, for example, one disclosed in Japanese Patent Publication No. 6-055415 is known. FIG. 2 is a block diagram showing the extrusion molding apparatus disclosed in the above publication. Resin extrusion molding apparatus 100 shown in the figure
Is kneaded and melted by a extruder 2 such as a twin-screw extruder to extrude the raw material supplied from the raw material feeder 1 such as a weight type feeder or a capacity type feeder, and the extruded raw material is discharged by a gear pump 3 and filtered. A sheet material is formed by the sheet forming apparatus 5 via the apparatus 4.

Raw material feeder 1, extruder 2 and gear pump 3
Are respectively driven by the first motor 6, the second motor 7, and the third motor 8, and the speeds, in other words, the raw material supply amount, extrusion amount, and discharge amount are adjusted in accordance with the rotation speeds of the respective motors 6, 7, 8. It The motors 6, 7 and 8 are driven and controlled by an operation control device including a pressure detector 9, a rotation speed detector 10, a pressure controller 11 and a control operation panel 12. The pressure detector 9 detects the pressure between the extruder 2 and the gear pump 3, that is, the pressure before the gear pump, and outputs the detected value to the pressure controller 11. The rotation speed detector 10 detects the rotation speed of the third motor 8 and outputs the detected value to the pressure controller 11.

The pressure controller 11 feedback-controls the first motor 6 and the second motor 7 or the third motor 8 so that the pressure before the gear pump becomes a set pressure.
The setting pressure of the gear pump front pressure, the setting rotation speed of the third motor 8, the control constants such as the PID constant, etc. are set in advance by the control operation panel 12, and the gear pump front pressure and the setting pressure detected by the pressure detector 9 are set. And the respective rotation speeds of the first motor 6 and the second motor 7 or the third motor 8 are calculated based on this comparison result, and the first motor 6 and the second motor 7 or the third motor 8 are calculated based on the calculation result. The motor 8 is selectively feedback-controlled.

In selecting the feedback control,
The feedback control of the first motor 6 and the second motor 7 is performed at the time of molding, and the feedback control of the third motor 8 is selected at the time of start-up and when the discharge amount is changed. Further, when the third motor 8 is feedback-controlled, it is set to the rotation speed of the third motor 8 when the rotation speed of the third motor 8 detected by the rotation speed detector 10 reaches the set rotation speed. At the same time, the feedback control of the first motor 6 and the second motor 7 is automatically switched.

In the above structure, at the time of startup, the third motor 8 is feedback-controlled by the pressure controller 11 and the rotation speeds of the first motor 6 and the second motor 7 are increased. As the rotation speeds of the first motor 6 and the second motor 7 increase, the raw material feeder 1 and the extruder 2
The feed rate and the extrusion rate of the raw material increase, and the pressure before the gear pump increases. Then, when the pressure before the gear pump reaches the set pressure, the third motor 8 is feedback-controlled and the rotation speed of the gear pump 4 increases. After that, the rotation speeds of the first motor 6 and the second motor 7 are increased, and the raw material supply amount and the extrusion amount are increased. Along with this, the third motor 8 is feedback-controlled so that the pressure before the gear pump becomes the set pressure. As a result, the rotation speed of the third motor 8 increases, and when it reaches the set rotation speed, the pressure controller 1
The feedback control by 1 is switched to the first motor 6 and the second motor 7, and the molding operation is started.

At the time of molding, the first motor 6 and the second motor 7 are feedback-controlled by the pressure controller 11, and the rotation speed of the third motor 8 is set to the set rotation speed. That is, the gear pump 3 is operated at the set speed, and the raw material supply device 1 and the extruder 2 are feedback-controlled so as to have the pressure before the gear pump.

When changing the discharge amount, feedback control by the pressure controller 11 is set to a rotation speed corresponding to the discharge amount for changing the set rotation speed of the first motor 6 and the second motor 7 to the third motor 8. . And the first
Gradually operate the rotation speeds of the motor 6 and the second motor 7,
The raw material supply amount and the extrusion amount corresponding to the changed discharge amount are set. By operating the rotation speeds of the first motor 6 and the second motor 7, the pressure on the front side of the gear pump fluctuates, and the third motor 8 is feedback-controlled in accordance with this fluctuation. When the rotation speed of the third motor 8 is gradually changed and reaches the set rotation speed, the pressure controller 1
The feedback control by 1 is switched to the first motor 6 and the second motor 7, and the molding operation after changing the discharge amount is started.

In this way, the resin extrusion molding apparatus 100 is operated so as to discharge the raw material in a constant amount in a stable state, it is possible to satisfactorily form a sheet material having a predetermined thickness, and at the time of starting up and changing the discharge amount, Since the third motor 8, in other words, the gear pump 3 is feedback-controlled,
The pressure before the gear pump does not become negative pressure or excessive pressure and is stable, and furthermore, the gear pump 4 is quickly and smoothly controlled to the set rotational speed according to the fluctuation of the pressure before the gear pump.

[0010]

The conventional resin extrusion molding apparatus 100 is configured as described above, and the gear pump 3 has one unit.
When the structure of the table is sufficient, it is possible to operate so as to discharge the raw material in a constant amount in a stable state, and it is possible to favorably form a sheet material having a predetermined thickness. However, when a molded product is required to have high quality, it may be necessary to provide at least two filtering devices 4. In such a case, in the configuration of the conventional resin extrusion molding device 100, Due to the configuration, there is a problem that good operation control cannot be performed.

The present invention has been made to solve the above-mentioned problems, and an operation control device and an operation of a resin extrusion molding apparatus capable of performing good operation control when two filtration devices are installed. The purpose is to provide a control method.

[0012]

In order to solve the above-mentioned problems, the present invention provides a raw material feeder (21) and an extruder (2) for kneading, melting and extruding the raw material from the raw material feeder (21).
2) and the first and second gear pumps (23, 25) for quantitatively discharging the raw material extruded by the extruder (22), in the operation control device of the resin extrusion molding apparatus, the second gear pump ( The rotation speed of 25) is set to a set speed, and the speeds of the raw material feeder (21), the extruder (22) and the first gear pump (23) are feedback-controlled so that the pressure before the second gear pump becomes the set pressure. First feedback control means (32, 33, 34, 35, 36, 3
7), and when starting up and changing the discharge amount, the first and second
The speed of each gear pump (23, 25) is feedback-controlled so that the pressure before the gear pump reaches the set pressure, and when the speed of the second gear pump (25) reaches the set speed, the speed of the second gear pump (25). Is set to a set speed, and the second feedback control means (32, 33, 34, 35, 3) for feedback controlling the raw material supply machine (21), the extruder (22) and the first gear pump (23).
6 and 37) are provided.

The present invention also comprises a raw material feeder (21),
An extruder (22) for kneading and melting and extruding the raw material from the raw material supply machine (21), and first and second gear pumps (23, 25) for quantitatively discharging the raw material extruded by the extruder (22). In the method of controlling the operation of the resin extrusion molding apparatus, the raw material feeder (the feed speed of the second gear pump (25) is set to a set speed so that the pressure before the second gear pump becomes the set pressure during molding. 21), the speed of the extruder (22) and the first gear pump (23) is feedback-controlled,
At startup and when changing the discharge rate, the speeds of the respective gear pumps (23, 25) are feedback-controlled so that the pressures before the first and second gear pumps become the set pressure, and the speed of the second gear pump (25) is set to the set speed. The speed of the second gear pump (25) is set to a set speed and the raw material feeder (21), the extruder (22) and the first gear pump (23) are feedback-controlled. Is.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a resin extrusion molding apparatus according to an embodiment of the present invention. In this resin extrusion molding apparatus, a raw material supplied from a raw material supply device 21 is kneaded and melted by an extruder 22 such as a twin-screw extruder and extruded, and the extruded raw material is fed to a first gear pump 23 and a second gear pump 2
5, and the sheet material is formed by the sheet forming device 27. Further, a first filtering device 24 is provided at the subsequent stage of the first gear pump 23, and a second filtering device 26 is provided at the subsequent stage of the second gear pump 25.

The raw material feeder 21, the extruder 22, the first gear pump 23 and the second gear pump 25 are driven by a first motor 28, a second motor 29, a third motor 30 and a fourth motor 31, respectively. Each of the first to fourth motors 2
Reference numerals 8, 29, 30, and 31 denote a first pressure detector 32, a first rotation speed detector 33, a first pressure controller 34, a second pressure detector 35, a second rotation speed detector 36, and a second pressure controller 37. Drive control is performed by the operation control device including the control operation panel 38.

The first pressure detector 32 includes the extruder 22 and the first pressure detector 32.
The pressure between the gear pumps 23, that is, the pressure before the first gear pump is detected, and the detected value is detected by the first pressure controller 34.
It is designed to output to. The first rotation speed detector 33 detects the rotation speed of the third motor 30, and outputs the detected value to the first pressure controller 34.

The second pressure detector 35 is the first filtration device 24.
The pressure between the second gear pump 25 and the second gear pump 25, that is, the pressure before the second gear pump is detected, and the detected value is output to the second pressure controller 37. The second rotation speed detector 36 detects the rotation speed of the fourth motor 31, and outputs the detection value to the second pressure controller 37.

The second pressure controller 37 feedback-controls the third motor 30 or the fourth motor 31 so that the second gear pump front pressure becomes a set pressure, and the control operation panel 38 preliminarily controls the second gear pump front pressure. The set pressure and each rotation speed of the fourth motor 31 are calculated, and the third motor 30 or the fourth motor 31 is selectively feedback-controlled based on the calculation result.

The first pressure controller 34 feedback-controls the first motor 28 and the second motor 29 or the third motor 30 so that the pressure before the first gear pump becomes the set pressure. The set pressure of the pressure before one gear pump, the control constants such as the PID constant, and the like are set, and the first pressure detected by the first pressure detector 32.
The pre-gear pump pressure is compared with the set pressure, and the first motor 28 and the second motor 29 or the third motor are based on the comparison result.
Each rotation speed of the motor 30 is calculated, and the first motor 28 and the second motor 29 or the third motor is selectively feedback-controlled based on the calculation result.

The operation of the embodiment will be described below. The above feedback control is selected by the control operation panel 38.
Done by. During molding, the first pressure controller 34 feedback-controls the first motor 28 and the second motor 29, and the second pressure controller 37 feedback-controls the third motor 30. In addition, at the time of start-up and when the discharge amount is changed, the first pressure controller 34 feedback-controls the third motor 30,
The pressure controller 37 is adapted to feedback control the fourth motor 31.

If the second pressure controller 37 is feedback controlling the fourth motor 31, the second pressure controller 37
The fourth motor 31 detected by the rotation speed detector 36.
When the rotation speed of the third motor 30 reaches the set rotation speed, the fourth motor 31 is set and maintained at the set rotation speed, and the third motor 30
Is feedback-controlled, and the first pressure controller 34 is automatically switched to perform feedback control of the first motor 28 and the second motor 29. The switching to the above feedback control may be performed manually.

As described above, in the embodiment of the present invention, by installing one gear pump after the filtering device, it is possible to install two filtering devices. The extruder and the front gear pump are feedback-controlled so that the rear gear pump front pressure becomes the set pressure, and at the time of start-up and when the discharge amount is changed, the feedback control is performed so that each gear pump front pressure becomes the set pressure. It is possible to shorten the stable operation time and reduce the material loss.

[0023]

As described above, it is possible to install two filtration devices, and at the time of molding, the raw material feeder, the extruder and the front gear pump are feedback-controlled so that the rear gear pump front pressure becomes a set pressure, At startup and when changing the discharge rate, feedback control is performed on each gear pump so that the pressure before each gear pump becomes the set pressure.
It is possible to shorten the stable operation time and reduce the material loss.

[Brief description of drawings]

FIG. 1 is a block diagram showing an operation control device of a resin extrusion molding apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an operation control device of a conventional resin extrusion molding apparatus.

[Explanation of symbols]

21 Material Feeder, 22 Extruder, 23 First Gear Pump, 24 First Filtration Device, 25 Second Gear Pump, 26
2nd filtration apparatus, 27 sheet forming apparatus, 28 1st motor, 29 2nd motor, 30 3rd motor, 31 4th
Motor, 32 1st pressure detector, 33 1st rotation speed detector, 34 1st pressure controller, 35 2nd pressure detector, 36 2nd rotation speed detector, 37 2nd pressure controller, 38 Control operation panel.

Claims (2)

[Claims] 1. A raw material feeder (21) and an extruder (2) for kneading, melting and extruding the raw material from the raw material feeder (21).
2) and the first and second gear pumps (23, 25) for quantitatively discharging the raw material extruded by the extruder (22), the operation control device of the resin extrusion molding apparatus, wherein the second gear pump during molding. The rotation speed of (25) is set to the set speed, and the speeds of the raw material feeder (21), the extruder (22) and the first gear pump (23) are feedback-controlled so that the pressure before the second gear pump becomes the set pressure. First to do
Feedback control means (32, 33, 34, 35, 3
6 and 37), the speed of each gear pump (23, 25) is feedback controlled so that the pre-pressurization of the first and second gear pumps becomes the set pressure at the time of start-up and when the discharge amount is changed, and the second gear pump (25 ) Reaches the set speed, the speed of the second gear pump (25) is maintained at the set speed, and the raw material feeder (21), the extruder (22) and the first
Second feedback control means (32, 33, 34, 35, 36,) for feedback controlling the gear pump (23)
37) The operation control device of the extruder molding device, comprising: 2. A raw material feeder (21) and an extruder (2) for kneading, melting and extruding the raw material from the raw material feeder (21).
2) and the first and second gear pumps (23, 25) for quantitatively discharging the raw material extruded by the extruder (22), the operation control method of the resin extrusion molding apparatus, wherein the second gear pump is used during molding. The rotation speed of (25) is set to the set speed, and the speeds of the raw material feeder (21), the extruder (22) and the first gear pump (23) are feedback-controlled so that the pressure before the second gear pump becomes the set pressure. However, at startup and when changing the discharge rate, the speeds of the respective gear pumps (23, 25) are feedback-controlled so that the pressures before the first and second gear pumps become the set pressure, and the speed of the second gear pump (25) is adjusted. When the set speed is reached, the speed of the second gear pump (25) is maintained at the set speed, and the raw material feeder (21), the extruder (22) and the first
A method for controlling the operation of an extruder molding apparatus, which comprises feedback controlling a gear pump (23).