JP2011131381A - Method for changing processing amount during charge with loss in weight system feeder raw material - Google Patents

Method for changing processing amount during charge with loss in weight system feeder raw material Download PDF

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JP2011131381A
JP2011131381A JP2009290034A JP2009290034A JP2011131381A JP 2011131381 A JP2011131381 A JP 2011131381A JP 2009290034 A JP2009290034 A JP 2009290034A JP 2009290034 A JP2009290034 A JP 2009290034A JP 2011131381 A JP2011131381 A JP 2011131381A
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raw material
feeder
weight
loss
processing amount
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Takafumi Nii
貴文 仁井
Ryota Mito
良太 三戸
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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
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/72—Measuring, controlling or regulating
    • B29B7/726—Measuring properties of mixture, e.g. temperature or density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/72—Measuring, controlling or regulating
    • B29B7/728—Measuring data of the driving system, e.g. torque, speed, power, vibration
    • 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
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • 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
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • 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
    • B29C2948/9218—Weight
    • 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
    • B29C2948/92333—Raw material handling or dosing, e.g. active hopper or feeding device
    • 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
    • B29C2948/926—Flow or feed rate
    • 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
    • B29C2948/92676—Weight
    • 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
    • B29C2948/92828—Raw material handling or dosing, e.g. active hopper or feeding device
    • 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
    • B29C2948/92866—Inlet shaft or slot, e.g. passive hopper; Injector, e.g. injector nozzle on barrel

Abstract

<P>PROBLEM TO BE SOLVED: To change a processing amount by using a feed coefficient during the charge with a loss in weight system feeder raw material. <P>SOLUTION: In a method for changing a processing amount during the charge with the loss in weight system feeder raw material, the relation between the number of revolution of a motor and a processing amount is stored as a feed coefficient K1 in usual control of a loss in weight system feeder (1), and when processing setting is changed during the re-charge with the raw material, K1×processing amount setting=MV (the number of revolution of a feeder driving motor) is controlled. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、ロスインウェイト式フィーダ原料充填中の処理量変更方法に関し、特に、処理量を原料充填中も変更できるようにするための新規な改良に関する。   The present invention relates to a method for changing a processing amount during filling of a loss-in-weight feeder raw material, and more particularly to a novel improvement for enabling the processing amount to be changed even during filling of the raw material.

従来、用いられてきたこの種のロスインウェイト式フィーダの制御方法として、図３、図４に示す特許文献１の重量式フィーダが知られている。
図３は従来の重量式フィーダの一例を示す概略構成図、図４は重量式フィーダの一部断面図、図５は重量式フィーダの計量装置を示す一部断面図である。重量式フィーダ４Ａはホッパ２と、スクリュフィーダ４ａを回転駆動するモータ３とこのモータ３を制御する制御装置１５と、ホッパ２の下部に設けられるロードセル計重装置６とを備えて構成される。
前記制御装置１５は、インバータ１５ａとこのインバータ１５ａへの電力を調節する調節器１５ｂとを備えている。前記ロードセル計重装置６はロードセル６ａを有し、ホッパ２内の原料の減少重量を計測し、得られた重量信号を用いて、重量検出をロス・イン・ウェイト制御方法により行っている。
原料は供給によりホッパ２内の貯留量が除々に減少し、少量になったときに連続供給するために補給投入される。このとき、ロードセル計重装置６による計重は減少変化から増加変化となるため供給量の計量が不可能となる。このために、制御装置１５への回転数設定値を原料の補給投入直前の値で保持し、ロードセルの計重が減少変化となるまで一定回転数とすることで連続運転を可能としていた。 As a control method of this type of loss-in-weight feeder that has been used conventionally, the weight feeder of Patent Document 1 shown in FIGS. 3 and 4 is known.
3 is a schematic configuration diagram showing an example of a conventional weight type feeder, FIG. 4 is a partial sectional view of the weight type feeder, and FIG. 5 is a partial sectional view showing a weighing device of the weight type feeder. The weight type feeder 4 </ b> A includes a hopper 2, a motor 3 that rotationally drives the screw feeder 4 a, a control device 15 that controls the motor 3, and a load cell weighing device 6 that is provided below the hopper 2.
The control device 15 includes an inverter 15a and a regulator 15b that adjusts power to the inverter 15a. The load cell weigher 6 has a load cell 6a, measures the reduced weight of the raw material in the hopper 2, and performs weight detection by the loss-in-weight control method using the obtained weight signal.
The raw material is supplied and replenished for continuous supply when the amount of storage in the hopper 2 gradually decreases due to the supply. At this time, the weighing by the load cell weighing device 6 changes from a decrease change to an increase change, so that the supply amount cannot be measured. For this reason, the rotation speed set value to the control device 15 is held at the value immediately before the replenishment of the raw material, and the continuous operation is possible by setting the rotation speed to a constant value until the weight of the load cell decreases.

特開２００３−２６６１６４号公報JP 2003-266164 A

従来の二軸押出機の重量式フィーダ制御方法は、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、前述のロスインウェイト式フィーダは、重量センサによりフィーダ重量の時間変化を計測し、フィーダ駆動モータの回転数（出力）のフィードバック制御を行っていたため、ホッパ内の樹脂原料のレベルが原料下限の位置となると、上流の原料供給装置から原料を充填する必要があり、この原料を充填している期間は、前述のフィードバック制御が不可能となっていた。
また、従来の制御方法においては、充填開始より設定した一定期間（以後、充填期間とする）の間は、重量によるフィードバック制御を行わず、充填開始直前のモータ出力（トルク又は回転数）を保持していたため、充填期間中にフィーダの処理量の設定を変更した場合でも、充填中は処理量が一定であり、充填終了後に処理用の設定値／実績値間の過大な偏差による制御の乱れが発生するため、処理量の変更は不可能であった。 Since the conventional weight-type feeder control method for a twin-screw extruder is configured as described above, the following problems exist.
In other words, the above loss-in-weight feeder measures the change in feeder weight over time by a weight sensor and performs feedback control of the rotation speed (output) of the feeder drive motor. In this position, it is necessary to fill the raw material from the upstream raw material supply device, and during the period of filling this raw material, the aforementioned feedback control is impossible.
In the conventional control method, the motor output (torque or number of revolutions) immediately before the start of filling is maintained without performing feedback control by weight for a certain period set from the start of filling (hereinafter referred to as the filling period). Therefore, even if the feeder processing amount setting is changed during the filling period, the processing amount is constant during filling, and the control is disturbed due to an excessive deviation between the processing set value / actual value after filling. Therefore, the processing amount cannot be changed.

本発明によるロスインウェイト式フィーダ原料充填中の処理量変更方法は、予め定めた原料上限と原料下限を有するホッパ内の樹脂原料を、前記ホッパの下部に設けた重量センサの重量信号に基づいてフィーダ駆動モータのモータ回転数のフィードバック制御を行うことにより、二軸押出機に供給するようにしたロスインウェイト式フィーダを用い、前記ロスインウェイト式フィーダの前記フィードバック制御の通常制御中においては、前記モータ回転数と前記樹脂原料の処理量との関係をフィード係数Ｋ１〔Ｋ１＝フィーダ駆動モータ回転数（％）／処理量（Ｋｇ／ｈ）〕として計算して前記ロスインウェイト式フィーダの制御装置内に格納し、前記ホッパ内の樹脂原料が前記原料下限を下回ると前記制御装置からの原料再充填信号に基づいて前記ホッパ内に樹脂原料の再充填が行われ、前記充填の期間中に前記ロスインウェイト式フィーダの処理量設定が変更された場合には、前記制御装置は前記フィード係数より算出されたフィーダ駆動モータ回転数ＭＶ〔ＭＶ（％）＝Ｋ１×処理量設定（Ｋｇ／ｈ）〕を制御する方法である。   According to the present invention, there is provided a method for changing a processing amount during filling of a loss-in-weight feeder raw material based on a weight signal of a weight sensor provided in a lower portion of the hopper, with a resin raw material in a hopper having a predetermined raw material upper limit and raw material lower limit. By performing feedback control of the motor rotation speed of the feeder drive motor, using a loss-in-weight feeder that is supplied to the twin-screw extruder, during normal control of the feedback control of the loss-in-weight feeder, Control of the loss-in-weight type feeder by calculating the relationship between the motor rotation speed and the processing amount of the resin raw material as a feed coefficient K1 [K1 = feeder driving motor rotation speed (%) / processing amount (Kg / h)]. When the resin raw material in the hopper falls below the raw material lower limit, it is based on the raw material refill signal from the control device. When the resin raw material is refilled in the hopper and the processing amount setting of the loss-in-weight feeder is changed during the filling period, the control device feeds the feeder calculated from the feed coefficient. This is a method of controlling the drive motor speed MV [MV (%) = K1 × processing amount setting (Kg / h)].

本発明によるロスインウェイト式フィーダ原料充填中の処理量変更方法は、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、予め定めた原料上限と原料下限を有するホッパ内の樹脂原料を、前記ホッパの下部に設けた重量センサの重量信号に基づいてフィーダ駆動モータのモータ回転数のフィードバック制御を行うことにより、二軸押出機に供給するようにしたロスインウェイト式フィーダを用い、前記ロスインウェイト式フィーダの前記フィードバック制御の通常制御中においては、前記モータ回転数と前記樹脂原料の処理量との関係をフィード係数Ｋ１〔Ｋ１＝フィーダ駆動モータ回転数（％）／処理量（Ｋｇ／ｈ）〕として計算して前記ロスインウェイト式フィーダの制御装置内に格納し、前記ホッパ内の樹脂原料が前記原料下限を下回ると前記制御装置からの原料再充填信号に基づいて前記ホッパ内に樹脂原料の再充填が行われ、前記充填の期間中に前記ロスインウェイト式フィーダの処理量設定が変更された場合には、前記制御装置は前記フィード係数より算出されたフィーダ駆動モータ回転数ＭＶ〔ＭＶ（％）＝Ｋ１×処理量設定（Ｋｇ／ｈ）〕を制御することにより、定常時すなわち通常時は、フィーダ駆動モータ出力（回転数）のロスインウェイト式とし、充填期間はフィード係数による制御としたため、下流装置との連動運転においても原料投入に影響されることなく連続して処理量を変更することができる。
また、手動運転時においても、充填期間中の待ち時間がなくなり、運転における制限が減るため、運転が容易となる。 Since the processing amount changing method during the filling of the loss-in-weight type feeder raw material according to the present invention is configured as described above, the following effects can be obtained.
In other words, the resin raw material in the hopper having a predetermined raw material upper limit and raw material lower limit is controlled by feedback control of the motor rotation speed of the feeder drive motor based on the weight signal of the weight sensor provided at the lower portion of the hopper. Using a loss-in-weight feeder that is supplied to a shaft extruder, during the normal control of the feedback control of the loss-in-weight feeder, the relationship between the motor rotation speed and the amount of resin raw material is fed. Calculated as a coefficient K1 [K1 = feeder drive motor rotational speed (%) / processing amount (Kg / h)] and stored in the controller of the loss-in-weight feeder, the resin raw material in the hopper is the raw material lower limit Less than the refilling of the resin raw material in the hopper based on the raw material refilling signal from the control device, the filling period When the processing amount setting of the loss-in-weight type feeder is changed, the control device calculates the feeder drive motor rotational speed MV [MV (%) = K1 × processing amount setting (Kg / h)] in a steady state, that is, in a normal state, the feeder drive motor output (rotation speed) is a loss-in-weight type, and the filling period is controlled by a feed coefficient. The processing amount can be changed continuously without being affected by the input.
In addition, even during manual operation, there is no waiting time during the filling period, and restrictions on operation are reduced, so that operation is facilitated.

本発明によるロスインウェイト式フィーダ原料充填中の処理量変更方法を示す概略構成図である。It is a schematic block diagram which shows the processing amount change method during the loss-in-weight type feeder raw material filling by this invention. 図１の制御装置の内部構成を示す構成図である。It is a block diagram which shows the internal structure of the control apparatus of FIG. 従来の重量式フィーダの一例を示す構成図である。It is a block diagram which shows an example of the conventional weight type feeder. 図３に示す重量式フィーダの一部断面図である。It is a partial cross section figure of the weight type feeder shown in FIG. 従来の重量式フィーダの計重装置に示す一部断面図である。It is a partial cross section figure shown in the weighing apparatus of the conventional weight type feeder.

本発明は、処理量を原料充填中も変更できるようにしたロスインウェイト式フィーダ原料充填中の処理量変更方法を提供することを目的とする。   An object of the present invention is to provide a method for changing a processing amount during filling of a loss-in-weight type feeder raw material so that the processing amount can be changed even during filling of the raw material.

以下、図面と共に本発明によるロスインウェイト式フィーダ原料充填中の処理量変更方法の好適な実施の形態について説明する。
尚、従来例と同一又は同等部分には、同一符号を付して説明すると共に、ロスインウェイト式フィーダ自体については制御装置を除いては同一構造であるため、図３又は図４の構成を援用している。
図１において、符号１で示されるものは、上部ホッパ４０及びバルブ４１からなる原料供給装置４２に接続されたロスインウェイト式フィーダであり、このロスインウェイト式フィーダ１は、前記バルブ４１に接続されると共にその下方に位置するホッパ２と、このホッパ２の下部に接続されたフィーダ４Ａと、このフィーダ４Ａのスクリュ４を駆動するためのフィーダ駆動モータ３と、前記フィーダ４Ａの下方に位置し前記ホッパ２内の樹脂原料５の重量変化を検出するためのロードセル等からなる重量センサ６とから構成されている。 Hereinafter, preferred embodiments of a method for changing a processing amount during filling of a loss-in-weight feeder material according to the present invention will be described with reference to the drawings.
The same or equivalent parts as in the conventional example are described with the same reference numerals, and the loss-in-weight feeder itself has the same structure except for the control device. It is used.
In FIG. 1, what is indicated by reference numeral 1 is a loss-in-weight feeder connected to a raw material supply device 42 including an upper hopper 40 and a valve 41, and this loss-in-weight feeder 1 is connected to the valve 41. And a feeder 4A connected to the lower portion of the hopper 2, a feeder drive motor 3 for driving the screw 4 of the feeder 4A, and a feeder 4A. The weight sensor 6 includes a load cell or the like for detecting a change in the weight of the resin raw material 5 in the hopper 2.

前記ホッパ２には、樹脂原料５の貯蔵状態である原料上限Ｈと原料下限Ｌが前記重量センサ６で検出されるように構成され、前記フィーダ４Ａから供給される樹脂原料５は二軸押出機７に供給されるように構成されている。   The hopper 2 is configured such that a raw material upper limit H and a raw material lower limit L, which are storage states of the resin raw material 5, are detected by the weight sensor 6, and the resin raw material 5 supplied from the feeder 4A is a twin screw extruder. 7 is configured to be supplied.

前記原料供給装置４２及びロスインウェイト式フィーダ１の動作を制御するために制御装置８が設けられており、この制御装置８から出力される原料再充填信号８Ａは前記バルブ４１に対してその開閉弁を行うために供給される。
また、前記重量センサ６からの重量信号６Ａは前記制御装置８に供給され、前記フィーダ駆動モータ３は前記制御装置８に信号線によって接続されている。 A control device 8 is provided to control the operation of the raw material supply device 42 and the loss-in-weight feeder 1, and the raw material refill signal 8A output from the control device 8 is opened and closed with respect to the valve 41. Supplied to do valve.
The weight signal 6A from the weight sensor 6 is supplied to the control device 8, and the feeder drive motor 3 is connected to the control device 8 by a signal line.

前記制御装置８は、具体的には、図２に示されるように構成されている。すなわち、この制御装置８のモータ速度設定部８Ｂからのモータ速度設定値ＳＶ（処理量設定Ｋｇ／ｈ）は後述のフィード係数Ｋ１と乗算部８Ｃで乗算され、フィーダ駆動モータ設定出力ＭＶとしてフィーダ駆動モータ３に供給されるように構成されている。   Specifically, the control device 8 is configured as shown in FIG. That is, the motor speed setting value SV (processing amount setting Kg / h) from the motor speed setting unit 8B of the control device 8 is multiplied by a later-described feed coefficient K1 and a multiplication unit 8C, and feeder driving is performed as a feeder driving motor setting output MV. It is configured to be supplied to the motor 3.

次に、前述の構成においてロスインウェイト式フィーダの動作によりフィーダ原料充填中の処理量を変更する場合について説明する。
まず、図１及び図２において、前記ロスインウェイト式フィーダ１は、ホッパ２内に樹脂原料５が原料上限Ｈまで供給されている状態で、重量センサ６によりロスインウェイト式フィーダ１の重量の時間変化を計測し、フィーダ駆動モータ３の回転数のフィードバック制御を制御装置８で、前述の従来構成と同様に行う。 Next, a description will be given of a case in which the processing amount during feeder raw material filling is changed by the operation of the loss-in-weight feeder in the above-described configuration.
First, in FIG. 1 and FIG. 2, the loss-in-weight type feeder 1 is configured such that the weight of the loss-in-weight feeder 1 is measured by the weight sensor 6 in a state where the resin raw material 5 is supplied to the raw material upper limit H in the hopper 2. The time change is measured, and the feedback control of the rotation speed of the feeder drive motor 3 is performed by the control device 8 in the same manner as the above-described conventional configuration.

前述の場合、ホッパ２内の樹脂原料５のレベルが原料下限Ｌとなると、原料供給装置４２の上部ホッパ４０からホッパ２内に樹脂原料５を充填するために、バルブ４１に対して原料再充填信号８Ａが供給されてバルブ４１が開弁し、樹脂原料５が充填される。   In the above-described case, when the level of the resin raw material 5 in the hopper 2 reaches the raw material lower limit L, the valve 41 is refilled with the raw material to fill the hopper 2 from the upper hopper 40 of the raw material supply device 42. The signal 8A is supplied, the valve 41 is opened, and the resin material 5 is filled.

前述の充填を行う充填期間中は、前述のフィードバック制御が不可能であるため、ロスインウェイト式フィーダ１の通常のフィードバック制御中は、常に、制御装置８内で、フィーダ駆動モータ３のトルク又は回転数からなるフィーダ駆動モータ測定出力ＰＶ（％）と処理量Ｋｇ／ｈ（重量センサ６からの重量信号６Ａに基づく）との関係（以降、フィード係数Ｋ１とする）が計算され、制御装置８内に格納されている。   During the filling period in which the above-described filling is performed, the above-described feedback control is impossible. Therefore, during the normal feedback control of the loss-in-weight feeder 1, the torque of the feeder drive motor 3 or A relationship (hereinafter referred to as a feed coefficient K1) between the feeder drive motor measurement output PV (%) composed of the rotational speed and the processing amount Kg / h (based on the weight signal 6A from the weight sensor 6) is calculated, and the control device 8 Is stored inside.

尚、このフィード係数Ｋ１は、Ｋ１＝フィーダ駆動モータ測定出力（％）／処理量（Ｋｇ／ｈ）、すなわち、図２で示されるように、割り算部５０にて、前述のフィーダ駆動モータ測定出力（％）÷処理量（Ｋｇ／ｈ）を行うことにより前記フィード係数Ｋ１を得ることができる。   The feed coefficient K1 is K1 = feeder drive motor measurement output (%) / processing amount (Kg / h), that is, as shown in FIG. The feed coefficient K1 can be obtained by performing (%) ÷ processing amount (Kg / h).

次に、樹脂原料５のホッパ２内における貯蔵量が原料下限Ｌを下回ると、制御装置８から原料再充填信号８Ａが前記バルブ４１に供給され、バルブ４１が開弁して樹脂原料の再充填が行われるが、この充填期間中にロスインウェイト式フィーダ１の処理量設定Ｋｇ／ｈすなわち、モータ速度設定部８Ｂからのモータ速度設定値ＳＶが変更となった場合には、制御装置８は前記フィード係数Ｋ１より算出されたフィーダ駆動モータ設定出力ＭＶ（Ｋ１×処理量設定Ｋｇ／ｈ）をフィーダ駆動モータ３に供給してフィーダ動作を制御する。
尚、前記フィーダ駆動モータ設定出力ＭＶ（％）の変更は、前述のように充填期間中においても自動的に継続される。 Next, when the storage amount of the resin raw material 5 in the hopper 2 falls below the raw material lower limit L, a raw material refill signal 8A is supplied from the control device 8 to the valve 41, and the valve 41 is opened to refill the resin raw material. When the processing amount setting Kg / h of the loss-in-weight feeder 1, that is, the motor speed setting value SV from the motor speed setting unit 8B is changed during this filling period, the control device 8 Feeder drive motor setting output MV (K1 × processing amount setting Kg / h) calculated from the feed coefficient K1 is supplied to the feeder drive motor 3 to control the feeder operation.
Note that the change in the feeder drive motor setting output MV (%) is automatically continued even during the filling period as described above.

本発明によるロスインウェイト式フィーダ原料充填中の処理量変更方法は、樹脂原料に限ることなく、薬品及び食品等の分野にも適用することができる。   The method for changing the processing amount during the filling of the loss-in-weight type feeder raw material according to the present invention is not limited to the resin raw material, and can also be applied to the fields of chemicals and foods.

１ ロスインウェイト式フィーダ
２ ホッパ
３ フィーダ駆動モータ
４ スクリュ
４Ａ フィーダ
５ 樹脂原料
６ 重量センサ
６Ａ 重量信号
７ 二軸押出機
８ 制御装置
８Ａ 原料再充填信号
８Ｂ モータ速度設定部
８Ｃ 乗算部
４０ 上部ホッパ
４１ バルブ
４２ 原料供給装置
５０ 割り算部
Ｈ 原料上限
Ｌ 原料下限
ＳＶ モータ速度設定値（処理量設定Ｋｇ／ｈ）
ＰＶ フィーダ駆動モータ測定出力（％）
ＭＶ フィーダ駆動モータ設定出力（％）
〔Ｋ１×処理量測定（Ｋｇ／ｈ）〕 DESCRIPTION OF SYMBOLS 1 Loss-in-weight type feeder 2 Hopper 3 Feeder drive motor 4 Screw 4A Feeder 5 Resin raw material 6 Weight sensor 6A Weight signal 7 Twin screw extruder 8 Controller 8A Raw material refill signal 8B Motor speed setting part 8C Multiplying part 40 Upper hopper 41 Valve 42 Material supply device 50 Division H Material upper limit L Material lower limit SV Motor speed setting value (Processing amount setting Kg / h)
PV feeder drive motor measurement output (%)
MV feeder drive motor setting output (%)
[K1 x throughput measurement (Kg / h)]

Claims (1)

予め定めた原料上限(H)と原料下限(L)を有するホッパ(2)内の樹脂原料(5)を、前記ホッパ(2)の下部に設けた重量センサ(6)の重量信号(6A)に基づいてフィーダ駆動モータ(3)のモータ回転数のフィードバック制御を行うことにより、二軸押出機(7)に供給するようにしたロスインウェイト式フィーダを用い、
前記ロスインウェイト式フィーダ(1)の前記フィードバック制御の通常制御中においては、前記モータ回転数と前記樹脂原料(5)の処理量との関係をフィード係数Ｋ１〔Ｋ１＝フィーダ駆動モータ回転数（％）／処理量（Ｋｇ／ｈ）〕として計算して前記ロスインウェイト式フィーダ(1)の制御装置(8)内に格納し、前記ホッパ(2)内の樹脂原料(5)が前記原料下限(L)を下回ると前記制御装置(8)からの原料再充填信号(8A)に基づいて前記ホッパ(2)内に樹脂原料(5)の再充填が行われ、前記充填の期間中に前記ロスインウェイト式フィーダ(1)の処理量設定が変更された場合には、前記制御装置(8)は前記フィード係数(K1)より算出されたフィーダ駆動モータ回転数ＭＶ〔ＭＶ（％）＝Ｋ１×処理量設定（Ｋｇ／ｈ）〕を制御することを特徴とするロスインウェイト式フィーダ原料充填中の処理量変更方法。 The resin raw material (5) in the hopper (2) having a predetermined raw material upper limit (H) and raw material lower limit (L), a weight signal (6A) of a weight sensor (6) provided at the lower part of the hopper (2) Using a loss-in-weight feeder that is fed to the twin-screw extruder (7) by performing feedback control of the motor speed of the feeder drive motor (3) based on
During the normal control of the feedback control of the loss-in-weight feeder (1), the relationship between the motor rotational speed and the processing amount of the resin raw material (5) is expressed as a feed coefficient K1 [K1 = feeder driving motor rotational speed ( %) / Processing amount (Kg / h)] and stored in the control device (8) of the loss-in-weight feeder (1), and the resin raw material (5) in the hopper (2) is the raw material. When less than the lower limit (L), based on the raw material refill signal (8A) from the control device (8), the hopper (2) is refilled with the resin raw material (5), and during the filling period When the processing amount setting of the loss-in-weight feeder (1) is changed, the control device (8) causes the feeder drive motor rotational speed MV [MV (%) =% calculated from the feed coefficient (K1)]. K1 × processing amount setting (Kg / h)] is controlled. A method for changing the processing amount during the filling of the feeder material
JP2009290034A 2009-12-22 2009-12-22 Method for changing processing amount during charge with loss in weight system feeder raw material Pending JP2011131381A (en)

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