JPH09155953A - Method for controlling operation of extrusion molding machine - Google Patents

Method for controlling operation of extrusion molding machine

Info

Publication number
JPH09155953A
JPH09155953A JP7315537A JP31553795A JPH09155953A JP H09155953 A JPH09155953 A JP H09155953A JP 7315537 A JP7315537 A JP 7315537A JP 31553795 A JP31553795 A JP 31553795A JP H09155953 A JPH09155953 A JP H09155953A
Authority
JP
Japan
Prior art keywords
raw material
extruder
gear pump
rotation speed
material supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7315537A
Other languages
Japanese (ja)
Inventor
Tsutomu Natsume
勉 夏目
Koji Mizunuma
巧治 水沼
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shibaura Machine Co Ltd
Original Assignee
Toshiba Machine Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Machine Co Ltd filed Critical Toshiba Machine Co Ltd
Priority to JP7315537A priority Critical patent/JPH09155953A/en
Publication of JPH09155953A publication Critical patent/JPH09155953A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/365—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pumps, e.g. piston pumps
    • B29C48/37—Gear pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92514—Pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/9259—Angular velocity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92885—Screw or gear

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To perform smooth starting operation and molding condition changing operation in a short period of time by taking mass balance into consideration. SOLUTION: This extrusion molding machine 1 is constituted of a raw material supply device 3 for supplying raw material thereto and a gear pump 5 for measurement extruding raw material from the extrusion molding machine 1. In this case, while in a process to increase the speed of the extrusion molding machine 1 to a set value, conducting the control for keeping the rate Qf/Nm between the number of rotation Nm of the extrusion machine 1 and the raw material supply quantity Qf of the raw material supply quantity Qf to a predetermined value, the number of rotation of the gear pump 5 is feed forward controlled on the basis of the deflection relative to the set value Po of a gear pump prior pressure P and the raw material supply quantity Qf by the raw material supply device 3.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】この発明は、押出成形機の運
転制御方法に関し、特に原料供給機と原料吐出用ギアポ
ンプとを有する押出成形機の立ち上げ時あるいは成形条
件変更時の運転制御方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control method for an extrusion molding machine, and more particularly to an operation control method for starting up an extrusion molding machine having a raw material feeder and a raw material discharge gear pump or changing molding conditions. Is.

【０００２】[0002]

【従来の技術】押出成形機に原料を供給する原料供給機
と、押出成形機より原料を計量吐出するギアポンプとを
有する押出成形機の運転制御方法の従来技術として、特
開平２−６１１８号公報には、ギアポンプの回転数を設
定値に保ち、ギアポンプ前圧力が設定値になるように原
料供給機、押出成形機の運転速度をフィードバック制御
することが示されている。2. Description of the Related Art Japanese Patent Application Laid-Open No. 2-6118 discloses a conventional method of controlling the operation of an extruder having a raw material feeder for supplying the raw material to the extruder and a gear pump for metering and discharging the raw material from the extruder. In Japanese Patent Application Laid-Open No. 2004-242242, it is shown that the rotation speed of the gear pump is kept at a set value and the operating speeds of the raw material feeder and the extruder are feedback-controlled so that the pressure before the gear pump becomes the set value.

【０００３】また特開平２−１２００２３号公報、特開
平４−１２５１２３号公報には、ギアポンプ前圧力が設
定値になるようにギアポンプの回転数をフィードバック
制御することが示されている。Further, Japanese Unexamined Patent Publication No. 2-120023 and Japanese Unexamined Patent Publication No. 4-125123 disclose feedback control of the rotational speed of the gear pump so that the pressure before the gear pump becomes a set value.

【０００４】[0004]

【発明が解決しようとする課題】押出成形機の立ち上げ
時あるいは成形条件変更時におけるギアポンプ前圧力
は、多くの場合、非常に不安定であるから、ギアポンプ
前圧力が設定値になるように原料供給機、押出成形機の
運転速度をフィードバック制御しても、押出成形機に対
する原料投入からこれに伴うギアポンプ前圧力の変化ま
でには比較的大きい遅れ時間が存在するから、フィード
バック制御系を安定化させることが難しい。このため、
制御装置のメインゲインを大きくすることができず、定
常の成形状態が得られるまでに時間がかかり、原料、エ
ネルギの無駄が多い。In many cases, the pressure before the gear pump is very unstable when the extruder is started or when the molding conditions are changed. Even if feedback control is performed on the operating speed of the feeder and extruder, there is a relatively large delay time from the feed of raw material into the extruder to the change in the pressure before the gear pump, which stabilizes the feedback control system. Difficult to make For this reason,
The main gain of the control device cannot be increased, it takes time until a steady molding state is obtained, and there is much waste of raw materials and energy.

【０００５】またギアポンプ前圧力が設定値になるよう
にギアポンプの回転数をフィードバック制御するもので
は、このフィードバック制御が原料供給機、押出成形機
の運転制御と連動していないため、押出成形機がベント
アップ状態や飢餓状態に陥る可能性があり、立ち上げ運
転を短縮することができない。Further, in a system in which the rotation speed of the gear pump is feedback-controlled so that the pressure before the gear pump reaches a set value, this feedback control is not linked to the operation control of the raw material supply machine and the extrusion molding machine. Vent-up or starvation may occur, and startup operation cannot be shortened.

【０００６】また、従来は、何れの場合も原料投入によ
って押出成形機が過負荷状態になっても、これを回避す
るための制御が行われないため、押出成形機が過負荷状
態で連続運転されることがあり、押出成形機の耐久性を
損なうことなる。Further, in any of the conventional cases, even if the extruder is overloaded due to the introduction of raw materials, control is not performed to avoid this, so the extruder is continuously operated in the overloaded state. And the durability of the extruder is impaired.

【０００７】この発明は、上述の如き問題点に着目して
なされたものであり、マスバランスを考慮して円滑に短
時間で立ち上げ運転ならびに成形条件変更運転が行われ
れるようにし、また押出成形機が過負荷状態で連続運転
されることを回避する押出成形機の運転制御方法を提供
することを目的としている。The present invention has been made by paying attention to the above-mentioned problems, and in consideration of the mass balance, the start-up operation and the molding condition changing operation can be smoothly performed in a short time, and the extrusion can be performed. An object of the present invention is to provide an operation control method for an extruder, which avoids continuous operation of the molding machine in an overloaded state.

【０００８】[0008]

【課題を解決するための手段】上述の目的を達成するた
めに、請求項１による発明は、押出成形機に原料を供給
する原料供給機と、押出成形機より原料を計量吐出する
ギアポンプとを有する押出成形機の運転制御方法におい
て、立ち上げ時あるいは成形条件変更時には、前記押出
成形機の回転数を設定値まで増速する過程にて前記押出
成形機の回転数と前記原料供給機による原料供給量との
比率を所定値に保つ制御を行いつつ、前記ギアポンプの
回転数をギアポンプ前圧力の設定値に対する偏差と前記
原料供給機による原料供給量に基づいてフィードフォー
ワード制御するものである。In order to achieve the above-mentioned object, the invention according to claim 1 comprises a raw material feeder for supplying the raw material to the extruder, and a gear pump for metering and discharging the raw material from the extruder. In the method of controlling the operation of the extrusion molding machine having the above, when starting up or changing the molding conditions, in the process of increasing the rotation speed of the extrusion molding machine to a set value, the rotation speed of the extrusion molding machine and the raw material by the raw material supply machine The feedforward control is performed on the basis of the deviation of the gear pump front pressure from the set value and the raw material supply amount of the raw material supply machine, while controlling the ratio of the supply amount to a predetermined value.

【０００９】この運転制御方法では、押出成形機の回転
数、原料供給機による原料供給量、ギアポンプ前圧力の
検出値が必要であり、押出成形機の回転数は押出成形機
モータ（混練モータ）に接続された回転数検出器により
検出でき、原料供給機による原料供給量は原料供給機モ
ータに接続された回転数検出器により検出される回転数
より算出することができ、ギアポンプ前圧力はギアポン
プの吸入側に設けられた圧力検出器により検出できる。This operation control method requires the rotational speed of the extruder, the amount of raw material supplied by the raw material feeder, and the detected value of the pressure before the gear pump. The rotational speed of the extruder is the extruder motor (kneading motor). Can be detected by the rotation speed detector connected to the, and the amount of raw material supplied by the raw material supply machine can be calculated from the number of rotations detected by the rotation speed detector connected to the raw material supply machine motor. Can be detected by a pressure detector provided on the suction side of.

【００１０】押出成形機の回転数を設定値まで増速する
ことは、手動あるいはプログラム制御の何れにによって
も行うことが可能である。The speed of rotation of the extruder can be increased to a set value by either manual or program control.

【００１１】また上述の目的を達成するために、請求項
２による発明は、請求項１に記載の押出成形機の運転制
御方法において、前記ギアポンプの回転数を下式により
決定するものである。In order to achieve the above-mentioned object, the invention according to claim 2 is the operation control method for an extruder according to claim 1, wherein the rotation speed of the gear pump is determined by the following formula.

【００１２】 Ｎｇ＝Ｑｆ（ｔ−Ｔｏ）／ａ＋Ｇ（Ｐ−Ｐｏ） 但し、Ｎｇ；ギアポンプの回転数，Ｑｆ（ｔ）；原料供
給量，Ｔｏ；押出成形機に対して原料供給が開始されて
からギアポンプ前圧力の圧力検出器に圧力が現れるまで
の時間，ａ；ギアポンプの１回転当たりの吐出量，Ｇ；
ゲイン，Ｐ；ギアポンプ前圧力，Ｐｏ；ギアポンプ前圧
力の設定値 また上述の目的を達成するために、請求項３による発明
は、請求項１または２に記載の押出成形機の運転制御方
法において、前記押出成形機の回転数が設定値に達した
時あるいは前記原料供給機による原料供給量が設定値に
達した時に前記ギアポンプの回転数のフィードフォーワ
ード制御を終了するものである。Ng = Qf (t-To) / a + G (P-Po) However, Ng: rotation speed of gear pump, Qf (t); raw material supply amount, To; raw material supply to the extruder is started. From the time until the pressure appears at the pressure detector before the gear pump, a; Discharge per revolution of gear pump, G;
Gain, P; pressure before gear pump, Po; set value of pressure before gear pump Further, in order to achieve the above-mentioned object, the invention according to claim 3 is the operation control method for an extruder according to claim 1 or 2. The feedforward control of the rotation speed of the gear pump is terminated when the rotation speed of the extruder reaches a set value or when the raw material supply amount by the raw material supply machine reaches the set value.

【００１３】立ち上げ時あるいは成形条件変更時のフィ
ードフォーワード制御が終了した後、即ち定常成形状態
には、従来と同等のフィードバック制御が行われればよ
い。After the feedforward control at the time of start-up or when the molding conditions are changed, that is, in the steady molding state, the feedback control equivalent to the conventional one may be performed.

【００１４】また上述の目的を達成するために、請求項
４による発明は、請求項１〜３の何れかに記載の押出成
形機の運転制御方法において、前記押出成形機の回転数
の増加過程で当該押出成形機の負荷を検出し、過負荷状
態時には前記押出成形機の回転数をホールドあるいは前
記押出成形機の回転を停止するものである。In order to achieve the above-mentioned object, the invention according to claim 4 is the method for controlling the operation of an extruder according to any one of claims 1 to 3, wherein the process of increasing the rotation speed of the extruder is performed. The load of the extrusion molding machine is detected, and the rotation speed of the extrusion molding machine is held or the rotation of the extrusion molding machine is stopped in the overloaded state.

【００１５】押出成形機の負荷検出は、押出成形機モー
タの電流値より検知でき、このモータ電流値を電流計に
より計測し、モータ電流値が所定値に達すれば、過負荷
状態時であると云う判定がなされればよい。The load of the extruder can be detected from the current value of the extruder motor, and the motor current value is measured by an ammeter. If the motor current value reaches a predetermined value, it means that the motor is in an overload state. What is necessary is just to make a determination.

【００１６】[0016]

【発明の実施の形態】以下にこの発明の実施の形態を図
面を用いて詳細に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.

【００１７】図１はこの発明による押出成形機の運転制
御方法の実施の形態を示している。図１において、１は
押出成形機を、３は押出成形機１に原料を供給する原料
供給機を、５は押出成形機１より原料を計量吐出するギ
アポンプを、７はギアポンプ５の前方に取り付けられた
成形型などの付属装置を各々示している。FIG. 1 shows an embodiment of an operation control method for an extruder according to the present invention. In FIG. 1, 1 is an extrusion molding machine, 3 is a raw material supply machine for supplying raw materials to the extrusion molding machine 1, 5 is a gear pump for metering and discharging the raw material from the extrusion molding machine 1, and 7 is mounted in front of the gear pump 5. Each of the attached devices such as the formed mold is shown.

【００１８】押出成形機１は内蔵している混練軸を押出
成形機モータ１１によって回転駆動され、原料供給機３
は、スクリュ式のものであって原料供給機モータ１３に
よって回転駆動され、ギアポンプ５はギアポンプモータ
１５により回転駆動される。A kneading shaft incorporated in the extrusion molding machine 1 is driven to rotate by an extrusion molding machine motor 11, and a raw material supply machine 3 is provided.
Is a screw type and is rotationally driven by the raw material feeder motor 13, and the gear pump 5 is rotationally driven by the gear pump motor 15.

【００１９】押出成形機モータ１１と原料供給機モータ
１３には各々ロータリエンコーダのような回転数検出器
１７、１９が接続され、また押出成形機モータ１１の電
源回路にはモータ電流値を検出する電流計２１が接続さ
れている。またギアポンプ５の吸入側にはギアポンプ前
圧力を検出する圧力検出器２３が設けられている。Rotation speed detectors 17 and 19 such as rotary encoders are connected to the extruder motor 11 and the raw material feeder motor 13, respectively, and a motor current value is detected in a power supply circuit of the extruder motor 11. The ammeter 21 is connected. On the suction side of the gear pump 5, a pressure detector 23 that detects the pressure before the gear pump is provided.

【００２０】押出成形機モータ１１、原料供給機モータ
１３、ギアポンプモータ１５の運転は、コントローラ２
５により統括制御される。The operation of the extruder motor 11, raw material supply motor 13, and gear pump motor 15 is performed by the controller 2
5 is centrally controlled.

【００２１】コントローラ２５は、マイクロコンピュー
タを具備した電子制御式のものであり、回転数検出器１
７、１９、電流計２１、圧力検出器２３の各々による検
出値を入力し、回転数検出器１９により検出される原料
供給機３のモータ回転数より原料供給機３による原料供
給量Ｑｆを算出し、立ち上げ時あるいは成形条件変更時
には、立ち上げ時あるいは成形条件変更時には、押出成
形機１の回転数を設定値まで増速する過程にて、回転数
検出器１７により検出される押出成形機１の回転数（押
出成形機モータ１１の回転数）Ｎｍと原料供給機３によ
る原料供給量Ｑｆとの比率Ｑｆ／Ｎｍを所定値（一定
値）に保つ制御を行いつつ、ギアポンプ５の回転数を圧
力検出器２３により検出されるギアポンプ前圧力Ｐの設
定値Ｐｏに対する偏差と原料供給機３による原料供給量
Ｑｆに基づいてフィードフォーワード制御し、押出成形
機１の回転数Ｎｍが設定値（規定値）に達するか、ある
いは原料供給機３による原料供給量Ｑｆが設定値（規定
値）に達すれば、ギアポンプ回転数のフィードフォーワ
ード制御を終了し、この後、即ち定常成形状態には、従
来と同等のフィードバック制御を行う。The controller 25 is an electronically controlled type equipped with a microcomputer, and the rotation speed detector 1
7 and 19, the ammeter 21, and the pressure detector 23 are respectively input, and the raw material supply amount Qf by the raw material supply device 3 is calculated from the motor rotation speed of the raw material supply device 3 detected by the rotation speed detector 19. However, at the time of start-up or at the time of changing molding conditions, at the time of start-up or at the time of changing molding conditions, the extrusion molding machine detected by the rotation speed detector 17 in the process of increasing the rotation speed of the extrusion molding machine 1 to a set value. The rotation speed of the gear pump 5 is controlled while maintaining the ratio Qf / Nm between the rotation speed of 1 (the rotation speed of the extruder motor 11) Nm and the raw material supply amount Qf of the raw material supply device 3 at a predetermined value (constant value). Is feed-forward controlled based on the deviation of the gear pump front pressure P detected by the pressure detector 23 from the set value Po and the raw material supply amount Qf of the raw material supply device 3, and the rotation speed Nm of the extrusion molding machine 1 is When the constant value (specified value) is reached or the raw material supply amount Qf by the raw material supply device 3 reaches the set value (specified value), the feedforward control of the gear pump rotation speed is terminated, and thereafter, that is, in the steady molding state. Performs feedback control equivalent to the conventional one.

【００２２】このフィードフォーワード制御によるギア
ポンプ５の回転数は、物理収支式に基づき、下式により
決定することができる。The number of revolutions of the gear pump 5 by this feedforward control can be determined by the following equation based on the physical balance equation.

【００２３】 Ｎｇ＝Ｑｆ（ｔ−Ｔｏ）／ａ＋Ｇ（Ｐ−Ｐｏ） 但し、Ｎｇ；ギアポンプの回転数 Ｑｆ（ｔ）；原料供給量 Ｔｏ；押出成形機に対して原料供給が開始されてからギ
アポンプ前圧力の圧力検出器に圧力が現れるまでの時間
原料供給の無駄時間 ａ；ギアポンプの１回転当たりの吐出量 Ｇ；ゲイン Ｐ；ギアポンプ前圧力 Ｐｏ；ギアポンプ前圧力の設定値 上述の制御により、立ち上げ時あるいは成形条件変更時
など、押出成形機１の回転数を手動あるいはプログラム
制御によって設定値までの増速過程においては、押出成
形機１の回転数Ｎｍと原料供給機３による原料供給量Ｑ
ｆとの比率Ｑｆ／Ｎｍを一定値に保ちながら、ギアポン
プ５の回転数ＮｇがＮｇ＝Ｑｆ（ｔ−Ｔｏ）／ａ＋Ｇ
（Ｐ−Ｐｏ）の関係式によりフィードフォーワード制御
される。Ng = Qf (t-To) / a + G (P-Po) However, Ng; rotation speed of the gear pump Qf (t); raw material supply amount To; gear pump after starting the raw material supply to the extruder. Time until pressure appears in the pressure detector of the front pressure Dead time of material supply a; Discharge per rotation of gear pump G; Gain P; Gear pump front pressure Po; Gear pump front pressure set value In the process of increasing the rotation speed of the extruder 1 to a set value manually or by program control, such as when raising or changing the molding conditions, the rotation speed Nm of the extruder 1 and the raw material supply amount Q by the raw material supply device 3
The rotation speed Ng of the gear pump 5 is Ng = Qf (t-To) / a + G while keeping the ratio Qf / Nm with f constant.
Feedforward control is performed by the relational expression of (P-Po).

【００２４】これにより、押出成形機１がベントアップ
状態や飢餓状態に陥ることなく円滑な立ち上げ運転ある
いは成形条件変更時の過渡運転が行われる。また定常の
成形状態が早期に得られるようになり、原料、エネルギ
の無駄が低減する。As a result, a smooth start-up operation or a transient operation when changing the molding conditions is performed without the extruder 1 falling into a vent-up state or starvation state. Further, a steady molding state can be obtained at an early stage, and waste of raw materials and energy is reduced.

【００２５】またコントローラ２５は、押出成形機１の
回転数増加過程で、電流計２１により検出されるモータ
電流値より押出成形機１の負荷を検出し、過負荷状態時
には、換言すれば、モータ電流値が所定値以上になる
と、押出成形機１の回転数をホールドあるいは押出成形
機１の回転を停止あるいは原料供給量Ｑｆを低減する制
御を行う。Further, the controller 25 detects the load of the extruder 1 from the motor current value detected by the ammeter 21 in the process of increasing the rotation speed of the extruder 1, and in other words, in the overload state, in other words, the motor. When the current value exceeds a predetermined value, control is performed to hold the rotation speed of the extruder 1 or stop the rotation of the extruder 1 or reduce the raw material supply amount Qf.

【００２６】これにより押出成形機１が過負荷状態で連
続運転されることが回避され、押出成形機１の耐久性が
低減することが防止される。This prevents the extruder 1 from continuously operating in an overloaded state, and prevents the durability of the extruder 1 from decreasing.

【００２７】以上に於ては、この発明を特定の実施の形
態について詳細に説明したが、この発明は、これに限定
されるものではなく、この発明の範囲内にて種々の実施
の形態が可能であることは当業者にとって明らかであろ
う。In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to this, and various embodiments may be made within the scope of the present invention. The possibilities will be clear to the skilled person.

【００２８】[0028]

【発明の効果】以上の説明から理解される如く、この発
明による押出成形機の運転制御方法によれば、立ち上げ
時あるいは成形条件変更時には、押出成形機１の回転数
を設定値までの増速過程において、押出成形機の回転数
と原料供給機による原料供給量との比率を一定値に保ち
ながら、ギアポンプの回転数をギアポンプ前圧力の設定
値に対する偏差と原料供給機による原料供給量に基づい
てフィードフォーワード制御するから、押出成形機がベ
ントアップ状態や飢餓状態に陥ることなく円滑な立ち上
げ運転あるいは成形条件変更時の過渡運転が行われるよ
うになり、また定常の成形状態が早期に得られ、原料、
エネルギの無駄が低減する。As can be understood from the above description, according to the operation control method of the extruder according to the present invention, the rotation speed of the extruder 1 is increased to the set value at the start-up or when the molding conditions are changed. In the fast process, while maintaining the ratio of the rotation speed of the extruder and the amount of raw material supplied by the raw material feeder at a constant value, the number of revolutions of the gear pump is set to the deviation from the set value of the gear pump front pressure and the raw material supply amount by the raw material feeder. Since the feed forward control is performed based on this, the extruder can perform a smooth start-up operation or a transient operation when changing molding conditions without falling into a vent-up state or starvation state. Obtained in the raw material,
Energy waste is reduced.

【００２９】また押出成形機の回転数増加過程で、過負
荷状態時には押出成形機の回転数をホールドあるいは押
出成形機の回転を停止あるいは原料供給量を低減するす
るから、押出成形機が過負荷状態で連続運転されること
が回避され、押出成形機の耐久性が低減することが防止
される。Further, in the process of increasing the rotation speed of the extruder, the rotation speed of the extruder is held or the rotation of the extruder is stopped or the raw material supply amount is reduced in the overloaded state, so that the extruder is overloaded. The continuous operation in the state is avoided, and the durability of the extruder is prevented from being reduced.

【図面の簡単な説明】[Brief description of the drawings]

【図１】この発明による押出成形機の運転制御方法の実
施に使用されるシステム構成を示すブロック線図であ
る。FIG. 1 is a block diagram showing a system configuration used for implementing an operation control method for an extruder according to the present invention.

【符号の説明】[Explanation of symbols]

１ 押出成形機 ３ 原料供給機 ５ ギアポンプ ７ 付属装置 １１ 押出成形機モータ １３ 原料供給機モータ １５ ギアポンプモータ １７、１９ 回転数検出器 ２１ 電流計 ２３ 圧力検出器 ２５ コントローラ DESCRIPTION OF SYMBOLS 1 Extrusion molding machine 3 Raw material supply machine 5 Gear pump 7 Auxiliary device 11 Extrusion molding machine motor 13 Raw material supply machine motor 15 Gear pump motor 17, 19 Rotation speed detector 21 Ammeter 23 Pressure detector 25 Controller

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 押出成形機に原料を供給する原料供給機
と、押出成形機より原料を計量吐出するギアポンプとを
有する押出成形機の運転制御方法において、 立ち上げ時あるいは成形条件変更時には、前記押出成形
機の回転数を設定値まで増速する過程にて前記押出成形
機の回転数と前記原料供給機による原料供給量との比率
を所定値に保つ制御を行いつつ、前記ギアポンプの回転
数をギアポンプ前圧力の設定値に対する偏差と前記原料
供給機による原料供給量に基づいてフィードフォーワー
ド制御することを特徴とする押出成形機の運転制御方
法。1. A method of controlling the operation of an extruder having a raw material feeder for supplying the raw material to the extruder and a gear pump for metering and discharging the raw material from the extruder, wherein the method is used when starting up or changing molding conditions. In the process of increasing the rotation speed of the extruder to a set value, the rotation speed of the gear pump is controlled while maintaining the ratio of the rotation speed of the extruder and the amount of raw material supplied by the raw material feeder at a predetermined value. Is controlled based on the deviation of the pressure before the gear pump from the set value and the amount of raw material supplied by the raw material supply machine, and the operation control method of the extruder. 【請求項２】 前記ギアポンプの回転数を下式により決
定することを特徴とする請求項１に記載の押出成形機の
運転制御方法。 Ｎｇ＝Ｑｆ（ｔ−Ｔｏ）／ａ＋Ｇ（Ｐ−Ｐｏ） 但し、Ｎｇ；ギアポンプの回転数，Ｑｆ（ｔ）；原料供
給量，Ｔｏ；押出成形機に対して原料供給が開始されて
からギアポンプ前圧力の圧力検出器に圧力が現れるまで
の時間，ａ；ギアポンプの１回転当たりの吐出量，Ｇ；
ゲイン，Ｐ；ギアポンプ前圧力，Ｐｏ；ギアポンプ前圧
力の設定値2. The operation control method for an extruder according to claim 1, wherein the rotation speed of the gear pump is determined by the following equation. Ng = Qf (t-To) / a + G (P-Po) where Ng is the number of rotations of the gear pump, Qf (t) is the raw material supply amount, To is the front of the gear pump after the raw material supply is started to the extruder. Time until pressure appears at pressure detector, a; Discharge rate per revolution of gear pump, G;
Gain, P; Gear pump front pressure, Po; Gear pump front pressure set value 【請求項３】 前記押出成形機の回転数が設定値に達し
た時あるいは前記原料供給機による原料供給量が設定値
に達した時に前記ギアポンプの回転数のフィードフォー
ワード制御を終了することを特徴とする請求項１または
２に記載の押出成形機の運転制御方法。3. The feedforward control of the rotation speed of the gear pump is terminated when the rotation speed of the extruder reaches a set value or when the raw material supply amount by the raw material supply machine reaches the set value. The operation control method for an extruder according to claim 1 or 2, which is characterized. 【請求項４】 前記押出成形機の回転数の増加過程で当
該押出成形機の負荷を検出し、過負荷状態時には前記押
出成形機の回転数をホールドあるいは前記押出成形機の
回転を停止あるいは原料供給量を低減することを特徴と
する請求項１〜３の何れかに記載の押出成形機の運転制
御方法。4. The load of the extrusion molding machine is detected in the process of increasing the rotation speed of the extrusion molding machine, and the rotation speed of the extrusion molding machine is held or the rotation of the extrusion molding machine is stopped or the raw material is in an overloaded state. The operation control method for an extruder according to claim 1, wherein the supply amount is reduced.
JP7315537A 1995-12-04 1995-12-04 Method for controlling operation of extrusion molding machine Pending JPH09155953A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7315537A JPH09155953A (en) 1995-12-04 1995-12-04 Method for controlling operation of extrusion molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7315537A JPH09155953A (en) 1995-12-04 1995-12-04 Method for controlling operation of extrusion molding machine

Publications (1)

Publication Number Publication Date
JPH09155953A true JPH09155953A (en) 1997-06-17

Family

ID=18066539

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7315537A Pending JPH09155953A (en) 1995-12-04 1995-12-04 Method for controlling operation of extrusion molding machine

Country Status (1)

Country Link
JP (1) JPH09155953A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006327174A (en) * 2005-04-28 2006-12-07 Nitto Denko Corp Method of controlling output from extrusion molding device and sheet-like material fabricated using this
JP2010095000A (en) * 2008-10-16 2010-04-30 Vmi-Az Extrusion Gmbh Extrusion thrusting system
JP2013180560A (en) * 2012-03-05 2013-09-12 Kobe Steel Ltd Kneading and extruding machine and operation control method thereof
CN104339614A (en) * 2014-11-05 2015-02-11 重庆鸿岱科技有限公司 Plastic extruding machine die and metering pump power mounting device
JP2019069585A (en) * 2017-10-11 2019-05-09 株式会社日本製鋼所 Automatic startup control method of twin screw extruder
WO2023074024A1 (en) * 2021-10-28 2023-05-04 株式会社日本製鋼所 Kneading extruder, control method therefor, and production method for resin compound

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006327174A (en) * 2005-04-28 2006-12-07 Nitto Denko Corp Method of controlling output from extrusion molding device and sheet-like material fabricated using this
JP4553825B2 (en) * 2005-04-28 2010-09-29 日東電工株式会社 Extrusion molding apparatus discharge amount control method and sheet-like material molded using the same
JP2010095000A (en) * 2008-10-16 2010-04-30 Vmi-Az Extrusion Gmbh Extrusion thrusting system
JP2013180560A (en) * 2012-03-05 2013-09-12 Kobe Steel Ltd Kneading and extruding machine and operation control method thereof
CN104339614A (en) * 2014-11-05 2015-02-11 重庆鸿岱科技有限公司 Plastic extruding machine die and metering pump power mounting device
JP2019069585A (en) * 2017-10-11 2019-05-09 株式会社日本製鋼所 Automatic startup control method of twin screw extruder
WO2023074024A1 (en) * 2021-10-28 2023-05-04 株式会社日本製鋼所 Kneading extruder, control method therefor, and production method for resin compound

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