JP3938773B2 - Control method of gear pump for extrusion equipment - Google Patents

Control method of gear pump for extrusion equipment Download PDF

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Publication number
JP3938773B2
JP3938773B2 JP2004214551A JP2004214551A JP3938773B2 JP 3938773 B2 JP3938773 B2 JP 3938773B2 JP 2004214551 A JP2004214551 A JP 2004214551A JP 2004214551 A JP2004214551 A JP 2004214551A JP 3938773 B2 JP3938773 B2 JP 3938773B2
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gear pump
pressure
gear
extrusion
resin
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JP2006035457A (en
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直樹 高本
毅 川上
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Japan Steel Works Ltd
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Japan Steel Works Ltd
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    • 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
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/04—Particle-shaped
    • 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
    • B29C2948/92009—Measured parameter
    • B29C2948/92019—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
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92361—Extrusion unit
    • B29C2948/9238—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • 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
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92466—Auxiliary unit, e.g. for external melt filtering, re-combining or transfer between units
    • 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
    • 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
    • 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
    • B29C2948/92961—Auxiliary unit, e.g. for external melt filtering, re-combining or transfer between units

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

Description

本発明は、押出装置用ギアポンプの制御方法に関し、特に、少なくとも２箇所の樹脂圧力を用いてギアポンプの回転数を制御し、ギアポンプの安定制御を行うための新規な改良に関する。   The present invention relates to a method for controlling a gear pump for an extrusion apparatus, and more particularly, to a novel improvement for controlling the rotation speed of a gear pump using at least two resin pressures to perform stable control of the gear pump.

一般に、合成反応により生産された合成樹脂原料は、多くの場合、物性改善のため、スクリュ式押出機により混練溶融され、ペレット状の樹脂材料に造粒加工されている。このような加工に使用されるスクリュ式押出機は、通常、その先端にギアポンプを連結して押出装置として構成され、必要な押出圧力が確保されている。すなわち、押出装置は、図示していないが、スクリュ式押出機、このスクリュ式押出機の下流側に連結されるギアポンプ、このギアポンプの下流側に順次連結される濾過装置および造粒装置により構成されている。このギアポンプは、スクリュ式押出機から独立したギアポンプ用モータにより回転駆動され、その回転数を制御するために、ギアポンプの吸入側に設けた圧力伝送器によって樹脂圧力を計測していた。   In general, a synthetic resin raw material produced by a synthesis reaction is often kneaded and melted by a screw-type extruder and granulated into a pellet-shaped resin material in order to improve physical properties. A screw-type extruder used for such processing is usually configured as an extrusion device by connecting a gear pump to the tip thereof, and a necessary extrusion pressure is secured. That is, although not shown, the extrusion device is constituted by a screw type extruder, a gear pump connected to the downstream side of the screw type extruder, a filtration device and a granulating device sequentially connected to the downstream side of the gear pump. ing. This gear pump is driven to rotate by a gear pump motor independent of the screw extruder, and the resin pressure is measured by a pressure transmitter provided on the suction side of the gear pump in order to control the number of rotations.

このような押出装置の連続した工程による加工処理においては、ギアポンプの処理能力すなわち押出能力が、常時、スクリュ式押出機の押出能力以下となるように運転制御されている。樹脂圧力が、常時、所定範囲の正圧すなわち充満状態になるようにギアポンプの回転数すなわち押出量が制御されている。   In the processing by the continuous process of such an extrusion apparatus, operation control is performed so that the processing capacity of the gear pump, that is, the extrusion capacity, is always equal to or less than the extrusion capacity of the screw extruder. The rotational speed of the gear pump, that is, the amount of extrusion is controlled so that the resin pressure is always positive within a predetermined range, that is, a full state.

従来の押出装置用ギアポンプの制御方法は、以上のように構成されていたため、次のような課題が存在していた。
すなわち、樹脂流量、粘度の影響により測定された樹脂圧力に対してギアポンプの制御の追従性が悪く安定運転が非常に困難であった。
特に、押出機の処理能力が一定ではなく変動している時は、この従来の制御方法ではギアポンプの正確な制御が困難であった。
また、この従来方法では、全体構成がＬ字型をなす両端を支持する構成の押出装置において、特にギアポンプの制御が困難であった。 Since the conventional control method of the gear pump for the extrusion apparatus is configured as described above, the following problems exist.
That is, the followability of the control of the gear pump is poor with respect to the resin pressure measured due to the influence of the resin flow rate and viscosity, and stable operation is very difficult.
In particular, when the throughput of the extruder is not constant but fluctuates, it is difficult to accurately control the gear pump with this conventional control method.
Also, with this conventional method, it is particularly difficult to control the gear pump in an extrusion apparatus configured to support both ends of which the overall configuration is L-shaped.

本発明による押出装置用ギアポンプの制御方法は、スクリュ式押出機の先端側に少なくともギアポンプ、濾過装置および造粒装置を順次連結して構成される押出装置において、少なくとも前記スクリュ式押出機の吐出端とギアポンプの吸入端の２箇所で樹脂圧力を計測し、前記各樹脂圧力により前記ギアポンプのギア直前の溶融樹脂原料の樹脂圧力を予測し、予測された予測圧力により前記ギアポンプの回転数を制御する方法である。   A method for controlling a gear pump for an extrusion apparatus according to the present invention includes: an extrusion apparatus configured by sequentially connecting at least a gear pump, a filtration apparatus, and a granulation apparatus to a distal end side of a screw type extruder; and at least a discharge end of the screw type extruder. The resin pressure is measured at two locations of the suction end of the gear pump, the resin pressure of the molten resin raw material immediately before the gear of the gear pump is predicted by the resin pressure, and the rotation speed of the gear pump is controlled by the predicted prediction pressure. Is the method.

本発明による押出装置用ギアポンプの制御方法は、以上のように構成されているため、次のような効果を得ることができる。
すなわち、少なくともスクリュ式押出機の吐出端とギアポンプの吸入端の２箇所で溶融樹脂圧力を計測し、これ等の計測値の変化にもとづいてギアポンプのギア直前の溶融樹脂原料の圧力を予測し、予測された予測圧力によりギアポンプの回転数を制御することにより、ギアポンプの制御の追従性が改善され、ギア直前の溶融合成樹脂原料が常時充満し、樹脂流量及び粘度などの影響を受けることなく押出装置の安定運転が容易に実現できるようになった。 Since the control method of the gear pump for an extrusion apparatus according to the present invention is configured as described above, the following effects can be obtained.
That is, the molten resin pressure is measured at least at two locations of the discharge end of the screw extruder and the suction end of the gear pump, and the pressure of the molten resin raw material immediately before the gear of the gear pump is predicted based on the change of these measured values. By controlling the rotation speed of the gear pump with the predicted pressure, the followability of the gear pump control is improved, the molten synthetic resin raw material immediately before the gear is always filled, and the extrusion is not affected by the resin flow rate and viscosity. The stable operation of the device can be easily realized.

以下、図面と共に本発明による押出装置用ギアポンプの制御方法の好適な実施の形態について説明する。
図１において、符号１で示されるものは押出装置であり、この押出装置１はスクリュ式押出機２、ダイバータバルブ３、連結管４、ギアポンプ５、濾過装置６および造粒装置７を上流から下流へ順次連結して構成されている。 DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a method for controlling a gear pump for an extrusion apparatus according to the present invention will be described with reference to the drawings.
In FIG. 1, what is indicated by reference numeral 1 is an extrusion device, and this extrusion device 1 includes a screw type extruder 2, a diverter valve 3, a connecting pipe 4, a gear pump 5, a filtration device 6 and a granulation device 7 from upstream to downstream. It is configured by sequentially connecting to.

前記スクリュ式押出機２はシリンダ２Ａ内にスクリュ片端支持で構成され、図示しないスクリュが減速機２ａを介して駆動モータ２ｂに連結されている。このシリンダ２Ａの上流側端部には、シリンダ２Ａ内へ合成樹脂原料を供給するホッパ２ｃが設けられている。前記ギアポンプ５には図示しないギアポンプ用駆動装置、前記造粒装置７には図示しない造粒装置用駆動装置がそれぞれ独立して回転駆動可能に設けられ、前記濾過装置６には濾過用スクリーンを交換するための図示しない駆動装置が設けられている。また、スクリュ式押出機２の先端の吐出端１０には第１圧力計測点Ａとして、シリンダ先端内の流路圧力を計測して計測値を図示しない制御装置へ伝送可能な第１圧力伝送器８が設けられ、前記連結管４にはギアポンプ５の吸入端１１すなわちギアポンプ５のギア５Ａの直前の第２圧力計測点Ｂとして、連結管４内の流路圧力を計測して計測値を図示しない制御装置へ伝送可能な第２圧力伝送器９が設けられている。   The screw type extruder 2 is constituted by a screw one end support in a cylinder 2A, and a screw (not shown) is connected to a drive motor 2b via a speed reducer 2a. A hopper 2c for supplying a synthetic resin material into the cylinder 2A is provided at the upstream end of the cylinder 2A. The gear pump 5 is provided with a gear pump driving device (not shown), and the granulating device 7 is provided with a granulating device driving device (not shown) so as to be independently rotatable. The filtration device 6 has a filtration screen exchanged. A driving device (not shown) is provided. Further, a first pressure transmitter capable of measuring a flow path pressure in the tip of the cylinder and transmitting the measured value to a control device (not shown) as a first pressure measuring point A at the discharge end 10 at the tip of the screw extruder 2. 8 is provided, and the connection pipe 4 measures the flow path pressure in the connection pipe 4 as a second pressure measurement point B immediately before the suction end 11 of the gear pump 5, that is, the gear 5A of the gear pump 5, and shows the measured value. A second pressure transmitter 9 is provided that can transmit to the control device that does not.

以上のように構成された押出装置１において、合成樹脂原料は以下のように加工処理される。すなわち、スクリュ式押出機２のスクリュが減速機２ａを介して駆動モータ２ｂにより回転駆動され、ギアポンプ５が駆動され、造粒装置７がそれぞれ所定条件により運転されている状態で、スクリュ式押出機２において、その上流部のホッパ２ｃからシリンダ２Ａ内へ合成樹脂原料が連続的に供給される。この合成樹脂原料は、スクリュ式押出機２により溶融混練され、ダイバータバルブ３および連結管４を経てギアポンプ５へ押出され、ギアポンプ５により昇圧され、濾過装置６により不純物を除去され、造粒装置７によりペレット状の樹脂材料に加工される。   In the extrusion apparatus 1 configured as described above, the synthetic resin raw material is processed as follows. That is, the screw extruder 2 is driven in a state where the screw of the screw extruder 2 is rotationally driven by the drive motor 2b via the speed reducer 2a, the gear pump 5 is driven, and the granulating device 7 is operated under predetermined conditions. 2, the synthetic resin raw material is continuously supplied from the upstream hopper 2c into the cylinder 2A. This synthetic resin raw material is melted and kneaded by the screw type extruder 2, extruded to the gear pump 5 through the diverter valve 3 and the connecting pipe 4, boosted by the gear pump 5, impurities removed by the filtering device 6, and the granulating device 7 Is processed into a pellet-shaped resin material.

このような押出装置１の連続した工程による加工処理において、第１圧力伝送器８および第２圧力伝送器９により、それぞれ第１圧力計測点Ａおよび第２圧力計測点Ｂにおける流路内の溶融樹脂圧力ＰａおよびＰｂが計測され、この計測圧力が図示しない制御装置へ伝送され、図３に示すように、ギアポンプ５の直前の圧力予測点Ｓの圧力が予測され、予測圧力がギア５Ａ直前を溶融樹脂原料で充満させるためのギア直前設定樹脂圧力Ｐｓになるように、ギアポンプ５の運転が制御され、ギアポンプ５の回転数が制御される。また、図３では３つの測定結果が樹脂圧力勾配として示されているが、何れの場合も、ギア直前設定樹脂圧力Ｐｓとなるように前記制御装置によって制御される。   In such processing in the continuous process of the extrusion apparatus 1, the first pressure transmitter 8 and the second pressure transmitter 9 melt in the flow path at the first pressure measurement point A and the second pressure measurement point B, respectively. The resin pressures Pa and Pb are measured, and the measured pressure is transmitted to a control device (not shown). As shown in FIG. 3, the pressure at the pressure prediction point S immediately before the gear pump 5 is predicted, and the predicted pressure is immediately before the gear 5A. The operation of the gear pump 5 is controlled so that the resin pressure Ps immediately before the gear for filling with the molten resin material is reached, and the rotation speed of the gear pump 5 is controlled. In FIG. 3, three measurement results are shown as resin pressure gradients. In any case, the control device controls the resin pressure gradient Ps immediately before the gear.

尚、第１圧力計測点Ａおよび第２圧力計測点Ｂの流路方向の２点において溶融合成樹脂原料圧力を計測する場合を示したが、２点に限定されるものではなく、流路方向の３点あるいは４点において計測し、多次元的に予測してもよい。また、計測位置は前述の位置に限定されるものではなく、スクリュ式押出機２の先端すなわち吐出端１０からギアポンプ５の吸入端１１の間であれば、計測可能な任意の位置でよい。
また、図１はスクリュ片端支持構造の押出装置を示しているが、図２に示されるスクリュ両端支持構造の押出装置１にも適用できるもので、図１と同一部分には同一符号を付し、その説明は省略する。 In addition, although the case where the molten synthetic resin raw material pressure is measured at two points in the flow path direction of the first pressure measurement point A and the second pressure measurement point B is shown, it is not limited to two points, and the flow path direction These may be measured at three or four points and predicted in a multidimensional manner. Further, the measurement position is not limited to the above-mentioned position, and any position that can be measured may be used as long as it is between the tip of the screw extruder 2, that is, the discharge end 10 and the suction end 11 of the gear pump 5.
1 shows an extrusion apparatus having a screw single-end support structure, it can also be applied to the extrusion apparatus 1 having a screw double-end support structure shown in FIG. 2, and the same parts as those in FIG. The description is omitted.

本発明は、溶融樹脂の押出に限ることなく、例えば、液体の選出にも適用可能である。   The present invention is not limited to the extrusion of molten resin, and can be applied to, for example, liquid selection.

本発明による押出装置用ギアポンプの制御方法が適用される押出装置を示す正面図である。It is a front view which shows the extrusion apparatus with which the control method of the gear pump for extrusion apparatuses by this invention is applied. 図１の他の形態を示す正面図である。It is a front view which shows the other form of FIG. 本発明における溶融合成樹脂原料圧力線図である。It is a fusion synthetic resin raw material pressure diagram in the present invention.

符号の説明Explanation of symbols

１ 押出装置
２ スクリュ式押出機
３ ダイバータバルブ
４ 連結管
５ ギアポンプ
５Ａ ギア
６ 濾過装置
７ 造粒装置
８ 第１圧力伝送器
９ 第２圧力伝送器
Ａ 第１圧力計測点
Ｂ 第２圧力計測点 DESCRIPTION OF SYMBOLS 1 Extruder 2 Screw type extruder 3 Diverter valve 4 Connection pipe 5 Gear pump 5A Gear 6 Filtration device 7 Granulator 8 1st pressure transmitter 9 2nd pressure transmitter A 1st pressure measurement point B 2nd pressure measurement point

Claims (1)

スクリュ式押出機(2)の先端側に少なくともギアポンプ(5)、濾過装置(6)および造粒装置(7)を順次連結して構成される押出装置において、少なくとも前記スクリュ式押出機(2)の吐出端とギアポンプ(5)の吸入端の２箇所で樹脂圧力を計測し、前記各樹脂圧力により前記ギアポンプ(5)のギア直前の溶融樹脂原料の樹脂圧力を予測し、予測された予測圧力により前記ギアポンプ(5)の回転数を制御することを特徴とする押出装置用ギアポンプの制御方法。   In an extrusion apparatus constituted by sequentially connecting at least a gear pump (5), a filtration device (6) and a granulation device (7) to the tip side of the screw extruder (2), at least the screw extruder (2) The resin pressure is measured at two locations, the discharge end of the gear pump and the suction end of the gear pump (5), and the resin pressure of the molten resin raw material immediately before the gear of the gear pump (5) is predicted based on each resin pressure, and the predicted pressure predicted A method for controlling a gear pump for an extrusion apparatus, wherein the rotational speed of the gear pump (5) is controlled by
JP2004214551A 2004-07-22 2004-07-22 Control method of gear pump for extrusion equipment Expired - Lifetime JP3938773B2 (en)

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JP5845114B2 (en) 2012-03-05 2016-01-20 株式会社神戸製鋼所 Kneading extrusion equipment and operation control method thereof
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