JP4707103B2 - Rubber extruder and rubber retention detection method thereof - Google Patents

Rubber extruder and rubber retention detection method thereof Download PDF

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JP4707103B2
JP4707103B2 JP2005297615A JP2005297615A JP4707103B2 JP 4707103 B2 JP4707103 B2 JP 4707103B2 JP 2005297615 A JP2005297615 A JP 2005297615A JP 2005297615 A JP2005297615 A JP 2005297615A JP 4707103 B2 JP4707103 B2 JP 4707103B2
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rubber
screw
cylinder
rotational speed
hopper
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JP2007105943A (en
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雅俊 吉田
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Bridgestone Corp
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Bridgestone Corp
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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
    • B29C48/25—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
    • 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
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
    • B29B7/7495—Systems, i.e. flow charts or diagrams; Plants for mixing rubber
    • 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
    • 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
    • B29C2948/92114—Dimensions
    • B29C2948/92161—Volume or quantity
    • 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
    • B29C2948/92609—Dimensions
    • B29C2948/92657—Volume or quantity
    • 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

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

Description

本発明は、ゴム押出機及びその内部にゴムが滞留していることを検出する方法に関し、詳細には、ゴムの滞留を確実に検出できるゴム押出機及びそのゴム滞留検出方法に関する。   The present invention relates to a rubber extruder and a method for detecting the retention of rubber in the interior thereof, and more particularly, to a rubber extruder capable of reliably detecting the retention of rubber and a method for detecting the rubber retention.

タイヤ構成部材等の混練ゴムシートを製造する装置として、バンバリーミキサー等により混練されたゴムをスクリュー式のゴム押出機のホッパーに投入し、投入されたゴムをスクリューの回転により前方へ移送し、ゴム押出機前端の押出ヘッドから押出し、押出されたゴムを、一対のカレンダロールを有するローラダイ装置により所定の厚み及び幅に成型するようにしたローラヘッド押出機がある（特許文献１参照）。   As a device for producing kneaded rubber sheets for tire components, etc., rubber kneaded by a Banbury mixer or the like is put into a hopper of a screw type rubber extruder, and the introduced rubber is transferred forward by rotation of a screw. There is a roller head extruder in which a rubber die device having a pair of calender rolls is molded into a predetermined thickness and width by extrusion from an extrusion head at the front end of the extruder (see Patent Document 1).

このようなローラヘッド押出機において、ゴム押出機のトラブルなどによりスクリューが停止してしまい、ゴム押出機内（ホッパー及びシリンダ内）にゴムが滞留することがある。この場合、バンバリーミキサー等により混練されたゴムは熱入れされた状態であり、かつゴム自体の分解反応により自己発熱する可能性のあることから、滞留状態が長時間継続すると、滞留しているゴムの温度が上昇し、ゴム押出機内で発火するおそれがある。   In such a roller head extruder, the screw may stop due to a problem with the rubber extruder or the like, and the rubber may stay in the rubber extruder (the hopper and the cylinder). In this case, the rubber kneaded by a Banbury mixer or the like is in a heated state and may self-heat due to the decomposition reaction of the rubber itself. There is a risk of fire in the rubber extruder.

そこで、文献に記載されたものではないが、従来は、押出ヘッドから押出されたゴムの圧力（バンク圧力）の低下に基づいてゴムが滞留していることを検出し、警報を出力する等の対処を行っている。
特開平９−８５８０１号公報 Therefore, although not described in the literature, conventionally, it is detected that the rubber has accumulated based on a decrease in the pressure (bank pressure) of the rubber extruded from the extrusion head, and an alarm is output. We are dealing with it.
JP-A-9-85801

しかしながら、押出ヘッドから押出されるゴムの圧力は、押出機の減速時や停止時にも低下するため、ゴムの滞留を確実に検出できないという問題がある。   However, since the pressure of the rubber extruded from the extrusion head decreases even when the extruder is decelerated or stopped, there is a problem that the retention of rubber cannot be reliably detected.

本発明は、このような問題点に鑑みてなされたものであり、その目的は、スクリュー式のゴム押出機内にゴムが滞留していることを確実に検出することである。   The present invention has been made in view of such problems, and an object of the present invention is to reliably detect the retention of rubber in a screw type rubber extruder.

請求項１の発明は、ホッパーを通してシリンダ内に供給されたゴムを、シリンダ内に配置されたスクリューを規定数回転させることで押出すようにしたゴム押出機であって、前記スクリューの回転速度が所定値となるように前記スクリューを回転させる回転手段と、前記ホッパーにゴムが供給されたことを検出するゴム供給検出手段と、前記スクリューの回転数を検出する回転数検出手段と、時間を計測する時間計測手段と、前記回転手段が動作している状態で前記ゴム供給検出手段がゴムを検出したとき、前記回転数検出手段及び時間計測手段の動作を開始させる手段と、前記時間計測手段の計測値が前記規定数を前記所定値で除算した値に到達したとき、前記回転数検出手段の検出値が前記規定数に到達していない場合に、前記シリンダ内のゴムが滞留していると判断する手段とを備えたことを特徴とするゴム押出機である。
請求項２の発明は、ホッパーを通してシリンダ内に供給されたゴムを、シリンダ内に配置されたスクリューを規定数回転させることで押出すようにしたゴム押出機の前記シリンダ内のゴムの滞留を検出する方法であって、前記スクリューの回転速度が所定値となるように前記スクリューを回転させる回転工程と、前記ホッパーにゴムが供給されたことを検出する工程と、前記回転工程の実行中に前記ホッパーにゴムが供給されたことを検出したときに、前記スクリューの回転数の計測及び時間の計測を開始する工程と、前記時間の計測値が前記規定数を前記所定値で除算した値に到達したとき、前記スクリューの回転数の計測値が前記規定数に到達していない場合に、前記シリンダ内のゴムが滞留していると判断する工程とからなることを特徴とするゴム押出機のゴム滞留検出方法である。 The invention of claim 1, the rubber supplied to the cylinder through a hopper, a rubber extruder to extrude a screw disposed in the cylinder by rotating Tadashi constant rotational speed of the screw Rotating means for rotating the screw to a predetermined value, rubber supply detecting means for detecting that rubber has been supplied to the hopper, rotational speed detecting means for detecting the rotational speed of the screw, and measuring time Time measuring means, means for starting operation of the rotational speed detecting means and time measuring means when the rubber supply detecting means detects rubber in a state where the rotating means is operating, and the time measuring means when the measured value has reached the value obtained by dividing the provisions constant at the predetermined value, when the detected value of the rotational speed detecting means has not reached the said regulations constant, the cylinder A rubber extruder, wherein the rubber has a means for determining that staying.
The invention of claim 2, the rubber fed into the cylinder through a hopper, detecting the retention of the rubber in the cylinder of the rubber extruder to extrude a screw disposed in the cylinder by rotating Tadashi constant A rotation step of rotating the screw so that a rotation speed of the screw becomes a predetermined value, a step of detecting that rubber is supplied to the hopper, and the rotation step during the execution of the rotation step. when it is detected that the rubber is fed to the hopper, the steps of initiating a rotational speed measurement and time measurement of the screw, reaches a value that the measured value of the time obtained by dividing the provisions constant at the predetermined value JP when, when the rotational speed of the measurement values of the screw has not reached the regulations constants, that rubber in the cylinder and a step of determining that the accumulated A rubber retention method for detecting rubber extruder with.

（作用）
本発明によれば、ホッパーを通してシリンダ内に供給されたゴムを、シリンダ内に配置されたスクリューを規定数回転させることで押出すようにしたゴム押出機において、スクリューの回転速度が所定値となるようにスクリューを回転させている状態でホッパーを通してシリンダ内にゴムが供給されたときから、前記規定数を前記所定値で除算した時間が経過したときまでに、前記スクリューが前記規定数回転していない場合に、前記シリンダ内にゴムが滞留していると判断する。 (Function)
According to the present invention, the supplied rubber into the cylinder through the hopper, in the rubber extruder screw disposed in the cylinder was set to be extruded by rotating Tadashi constant rotational speed of the screw reaches the predetermined value since the rubber is fed through a hopper into the cylinder in a state that by rotating the screw so, by the time the time obtained by dividing the provisions constant at the predetermined value has passed, the screw is rotating the regulations constant If not, it is determined that the rubber stays in the cylinder.

本発明によれば、ホッパーを通してシリンダ内に供給されたゴムを、シリンダ内に配置されたスクリューを規定数回転させることで押出すようにしたゴム押出機において、スクリューの回転速度が所定値となるようにスクリューを回転させているとき、シリンダ内にゴムが滞留していると、スクリューの回転速度が低下若しくは回転が停止していることに着目し、ホッパーを通してシリンダ内にゴムが供給されてから、所定時間経過したときまでのスクリューの回転数が規定数未満であることに基づいて、ゴムが滞留していることを確実に検出できる。 According to the present invention, in the rubber extruder in which the rubber supplied into the cylinder through the hopper is extruded by rotating the screw disposed in the cylinder a specified number of times, the screw rotation speed becomes a predetermined value. Pay attention to the fact that if the rubber stays in the cylinder while the screw is rotating, the rotational speed of the screw will decrease or stop rotating, and after the rubber is supplied into the cylinder through the hopper Based on the fact that the number of rotations of the screw until the predetermined time has elapsed is less than the specified number , it is possible to reliably detect that the rubber is staying.

以下、本発明の実施形態について図面を参照して説明する。
図１は本発明の実施形態に係るローラヘッド押出機の構成を示す図である。このローラヘッド押出機は、ゴム押出機１と、ゴム押出機１の前方に配置されてローラダイ装置２と、制御装置３とを備えている。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a roller head extruder according to an embodiment of the present invention. The roller head extruder includes a rubber extruder 1, a roller die device 2 disposed in front of the rubber extruder 1, and a control device 3.

ゴム押出機１は、シリンダ１１と、シリンダ１１の内部に回転自在に支持されたスクリュー１２と、シリンダ１１の先端に取り付けられた押出しヘッド１３と、シリンダ１１の後端付近の上部に設けられたホッパー１４と、スクリュー１２を回転させるモータ等の回転駆動装置１５とを備えている。ここで、ホッパー１４から投入されたゴム３１を押出しヘッド１３から押出すのに必要なスクリュー１２の回転数（規定回転数）は、ホッパー１４が設けられているシリンダ１１の部位から押出しヘッド１３迄の距離とスクリュー１２の螺旋のピッチとの関係で定まる。ローラダイ装置２は、互いの外周面が対向するように配置された一対のカレンダロールを備えており、図示しない回転駆動装置により、図示の矢印方向に回転可能に構成されると共に、ロール間のギャップの調整が可能に構成されている。   The rubber extruder 1 is provided in a cylinder 11, a screw 12 rotatably supported in the cylinder 11, an extrusion head 13 attached to the tip of the cylinder 11, and an upper portion near the rear end of the cylinder 11. A hopper 14 and a rotation drive device 15 such as a motor for rotating the screw 12 are provided. Here, the rotational speed (specified rotational speed) of the screw 12 required to extrude the rubber 31 introduced from the hopper 14 from the extrusion head 13 is from the portion of the cylinder 11 where the hopper 14 is provided to the extrusion head 13. And the relationship between the screw pitch and the helical pitch of the screw 12. The roller die device 2 includes a pair of calender rolls arranged so that their outer peripheral surfaces face each other, and is configured to be rotatable in the direction of the arrow shown in the figure by a rotary drive unit (not shown), and a gap between the rolls. It is configured to be adjustable.

また、ゴム押出機１のシリンダ１１の基端側には、回転駆動装置１５によりスクリュー１２の回転と同期して回転されるドグ２１が設けられ、ドグ２１の回転軌跡と対向する位置には近接センサ２２が配置されている。これにより、スクリュー１２が１回転する毎にドグ２１も１回転し、近接センサ２２がドグ２１の１回転毎の近接を検出し、制御装置３に通知するように構成されている。   In addition, a dog 21 that is rotated in synchronization with the rotation of the screw 12 by the rotation driving device 15 is provided on the proximal end side of the cylinder 11 of the rubber extruder 1, and is close to a position facing the rotation locus of the dog 21. A sensor 22 is arranged. Thus, each time the screw 12 makes one revolution, the dog 21 also makes one revolution, and the proximity sensor 22 detects the proximity of the dog 21 every revolution and notifies the control device 3.

ホッパー１４の内面には、互いに対向する発光素子２３と受光素子２４とからなるゴム供給センサを備えており、図示しないバンバリーミキサーからゴム３１がホッパー１４内に供給されると、発光素子２３から受光素子２４への光線がゴム３１により遮られることで、ホッパー１４にゴム３１が供給されたこと（ホッパー１４をゴム３１が通過したこと）を検知できる。また、ホッパー１４内に供給されたゴム３１の量がホッパー内に堆積され、その上端の位置がゴム供給センサの位置（レベル）よりも高くなったときは、発光素子２３から受光素子２４への光線が継続して遮られるため、ホッパー１４内に存在するゴム３１の上端がゴム供給センサの位置を越えていることを検知できる。これらの検知信号は制御装置３に入力される。   The inner surface of the hopper 14 is provided with a rubber supply sensor composed of a light emitting element 23 and a light receiving element 24 facing each other. When rubber 31 is supplied into the hopper 14 from a Banbury mixer (not shown), the light receiving element 23 receives light. It is possible to detect that the rubber 31 has been supplied to the hopper 14 (the rubber 31 has passed through the hopper 14) by blocking the light beam to the element 24 by the rubber 31. Further, when the amount of the rubber 31 supplied into the hopper 14 is accumulated in the hopper and the upper end position becomes higher than the position (level) of the rubber supply sensor, the light emitting element 23 to the light receiving element 24 Since the light is continuously blocked, it can be detected that the upper end of the rubber 31 existing in the hopper 14 exceeds the position of the rubber supply sensor. These detection signals are input to the control device 3.

押出しヘッド１３の内部には、スクリュー１２の回転により前方へ移送されるゴムの圧力を検知するための圧力センサ（ロードセル等）２５が配置されており、その出力信号は制御装置３に入力される。なお、圧力センサ２５は、特許文献１に開示されたもののように、カレンダロール対にかかる圧力を検出するように構成してもよい。   A pressure sensor (load cell or the like) 25 for detecting the pressure of rubber transferred forward by the rotation of the screw 12 is disposed inside the extrusion head 13, and its output signal is input to the control device 3. . Note that the pressure sensor 25 may be configured to detect the pressure applied to the calendar roll pair, as disclosed in Patent Document 1.

ローラダイ装置２の前方には、このローラダイ装置２により成型されたゴムシート３３を挟むように、互いに対向する発光素子２６と受光素子２７とからなるゴムシートセンサが配置されている。そして、ローラダイ装置２により成型されたゴムシート３３が所定の搬送路を通過していると、発光素子２６から受光素子２７への光線がゴムシート３３により遮られることで、ゴムシート３３が存在することを検知できる。受光素子２７の出力信号は制御部３に入力される。   A rubber sheet sensor composed of a light emitting element 26 and a light receiving element 27 facing each other is disposed in front of the roller die apparatus 2 so as to sandwich a rubber sheet 33 molded by the roller die apparatus 2. Then, when the rubber sheet 33 molded by the roller die device 2 passes through a predetermined conveyance path, the rubber sheet 33 is present because the light beam from the light emitting element 26 to the light receiving element 27 is blocked by the rubber sheet 33. Can be detected. The output signal of the light receiving element 27 is input to the control unit 3.

制御装置３は、コンピュータにより構成されており、タイマー４及び回転数カウンタ５を内蔵している。また、回転駆動装置１５を所定の回転速度で回転させることにより、スクリュー１２を回転させる。さらに、ローラダイ装置２のカレンダロール対を回転させる回転駆動装置を所定の回転速度で回転させる。これらの回転速度は複数の異なる速度の中から任意の一つを選択することができる。また、選択した回転速度でスクリュー１２を回転させているときに、圧力センサ２５で検知された圧力が、スクリュー１２の回転速度に対応する規定値となるように、回転駆動装置１５に対し、フィードバック制御を行うことで、押出ヘッド３２から押出されるゴムの圧力を一定にして、ゴムバンク３２の圧力を調整し、ローラダイ装置２により成型されるゴムシート３３の厚み及び幅が均一になるようにしている。   The control device 3 is configured by a computer and includes a timer 4 and a rotation number counter 5. Further, the screw 12 is rotated by rotating the rotation driving device 15 at a predetermined rotation speed. Further, the rotary drive device that rotates the calendar roll pair of the roller die device 2 is rotated at a predetermined rotational speed. Any one of these rotational speeds can be selected from a plurality of different speeds. Further, when the screw 12 is rotated at the selected rotational speed, feedback is given to the rotary drive device 15 so that the pressure detected by the pressure sensor 25 becomes a specified value corresponding to the rotational speed of the screw 12. By controlling, the pressure of the rubber extruded from the extrusion head 32 is made constant, the pressure of the rubber bank 32 is adjusted, and the thickness and width of the rubber sheet 33 molded by the roller die device 2 are made uniform. Yes.

以上のように構成されたローラヘッド押出機の動作を説明する。ホッパー１４内に供給されたゴム３１は、シリンダ１１内の後部に到達し、回転駆動装置１５の駆動により回転しているスクリュー１２により前方に搬送され、押出しヘッド３２の前端から押出される。押出されたゴムは、押出しヘッド３２の前方に配置されたローラダイ装置２のカレンダロール対の後方側（押出しヘッド３２と対向する側）にて加圧状態のバンク３２を形成する。前述したように、このバンク３２の圧力を適切に調整することにより、カレンダロール対により成型されるゴムシート３３の厚み及び幅が均一になる。   The operation of the roller head extruder configured as described above will be described. The rubber 31 supplied into the hopper 14 reaches the rear part in the cylinder 11, is conveyed forward by the screw 12 rotating by the drive of the rotary drive device 15, and is pushed out from the front end of the extrusion head 32. The extruded rubber forms a pressurized bank 32 on the rear side (the side facing the extrusion head 32) of the calender roll pair of the roller die device 2 arranged in front of the extrusion head 32. As described above, by appropriately adjusting the pressure of the bank 32, the thickness and width of the rubber sheet 33 molded by the calender roll pair become uniform.

本実施形態に係るゴム押出機では、図２に示す手順によりシリンダ１１内に供給されたゴム３１の滞留を検出している。この図に示す処理は、制御装置５により一定時間毎に繰り返し実行される。   In the rubber extruder according to the present embodiment, the stay of the rubber 31 supplied into the cylinder 11 is detected by the procedure shown in FIG. The process shown in this figure is repeatedly executed by the control device 5 at regular intervals.

制御装置５は、ホッパー１４に設けられたゴム供給センサ（受光素子２４）からホッパー１４内をゴム３１が通過したことを通知されると（ステップＳ１でYES ）、タイマー４のカウントを開始させる（ステップＳ２）。また、同時に、近接センサ２２の出力を回転数カウンタ５に供給する動作を開始させる。つまり、タイマー４のカウントの開始と同時に、スクリュー１２を回転させる回転駆動手段１５の回転数のカウントを開始させる。   When notified from the rubber supply sensor (light receiving element 24) provided in the hopper 14 that the rubber 31 has passed through the hopper 14 (YES in step S1), the control device 5 starts counting of the timer 4 ( Step S2). At the same time, the operation of supplying the output of the proximity sensor 22 to the rotation number counter 5 is started. That is, simultaneously with the start of the count of the timer 4, the rotation number of the rotation driving means 15 for rotating the screw 12 is started.

次いで、タイマー４が所定時間カウントしたときに、回転数カウンタ５のカウント値が規定回転数に達しているか否か判定する（ステップＳ３）。ここで、規定回転数とはホッパー１４からシリンダ１１内に投入されたゴム３１を押出ヘッド３２から押出すのに必要なスクリュー１２の回転数であり、所定時間とは、その規定回転数をスクリュー１２の回転速度で除算した値である。ここで、シリンダ１１内にゴムが滞留していないときは、前記所定時間経過したときの回転数が規定回転数に達するのに対し、シリンダ１１内にゴムが滞留していると、スクリュー１２の回転速度が低下若しくは回転が停止しているため、前記所定時間経過したときの回転数が規定回転数に達していない。従って、前記所定時間経過したときの回転数が規定回転数に達しているか否かに基づいて、シリンダ１１内にゴムが滞留しているか否かの判別ができる。   Next, when the timer 4 counts for a predetermined time, it is determined whether or not the count value of the rotation speed counter 5 has reached the specified rotation speed (step S3). Here, the specified rotational speed is the rotational speed of the screw 12 required to extrude the rubber 31 introduced into the cylinder 11 from the hopper 14 from the extrusion head 32, and the predetermined time is the predetermined rotational speed. The value is divided by 12 rotation speeds. Here, when the rubber does not stay in the cylinder 11, the rotational speed when the predetermined time elapses reaches a specified rotational speed, whereas when the rubber stays in the cylinder 11, Since the rotation speed is reduced or the rotation is stopped, the rotation speed when the predetermined time has elapsed does not reach the specified rotation speed. Therefore, it is possible to determine whether or not the rubber stays in the cylinder 11 based on whether or not the rotational speed when the predetermined time has elapsed has reached the specified rotational speed.

そして、ステップ４にて、規定回転数に達していないと判定した場合は、さらに一定時間経過後の最終判断時に、カウンタ５のカウント値が規定回転数に達しているか否か判定する（ステップＳ４）。ここで、最終判断時は予め実験により求めたゴム滞留による発火の可能性のある時間以前の所定の時点である。そして、ステップ４にて、規定回転数に達していないと判定した場合は、シリンダ１１内にゴムが滞留していると判断し（ステップＳ５）、回転駆動手段１５に供給する電力を増強することで駆動力を高め、スクリュー１２を強制的に規定回転数回転させ（ステップＳ６）、警報を発生させて（ステップＳ７）処理を終了する。また、機械的故障で回転できない場合も警報を発生させる。   If it is determined in step 4 that the specified rotational speed has not been reached, it is further determined whether or not the count value of the counter 5 has reached the specified rotational speed at the final determination after a predetermined time has elapsed (step S4). ). Here, the final judgment time is a predetermined time point before the time when there is a possibility of ignition due to rubber retention, which is obtained in advance by experiments. If it is determined in step 4 that the specified rotational speed has not been reached, it is determined that rubber is staying in the cylinder 11 (step S5), and the electric power supplied to the rotation driving means 15 is increased. In step S6, the driving force is increased and the screw 12 is forcibly rotated at a specified rotational speed (step S6), an alarm is generated (step S7), and the process is terminated. Also, an alarm is generated when rotation is not possible due to a mechanical failure.

ステップＳ３又はＳ４にて、規定回転数に達していると判定した場合は、警報を解除し（ステップＳ８）、処理を終了する。   If it is determined in step S3 or S4 that the specified rotational speed has been reached, the alarm is canceled (step S8), and the process is terminated.

このように、本発明の実施形態によれば、ホッパー１４にゴム３１が供給されてから所定時間（規定回転数をスクリュー１２の回転速度で除算した値）経過したときに、ホッパー１４にゴム３１が供給されてからスクリュー１２が規定回転数回転したか否かを判定し、その判定結果に基づいて、シリンダ１１内にゴムが滞留しているか否かを判断するので、ゴム押出機１の減速や停止をゴムの滞留と誤ることなく、ゴムの滞留を確実に検出できる。   Thus, according to the embodiment of the present invention, when a predetermined time (a value obtained by dividing the specified rotational speed by the rotational speed of the screw 12) has elapsed since the rubber 31 was supplied to the hopper 14, the rubber 31 is supplied to the hopper 14. Since it is determined whether or not the screw 12 has rotated the specified number of revolutions since the supply of the gas, and it is determined whether or not rubber is retained in the cylinder 11 based on the determination result, the speed of the rubber extruder 1 is reduced. It is possible to reliably detect the retention of rubber without mistakenly indicating the stoppage of the rubber and the stoppage.

なお、本発明は上記実施形態に限定されるものではなく、上述したホッパー１４にゴム３１が供給されてからスクリュー１２が規定回転数回転したか否かの判定結果と、圧力センサ２５、ゴムシートセンサ２６，２７の何れかの感知出力とを併用し、ゴムの滞留をより確実に検出するように構成してもよい。また、ホッパー供給センサ２３，２４、圧力センサ２５、ゴムシートセンサ２６，２７の何れかがゴム或いはゴムシートの存在を検出している状態で、ゴム押出機３のスクリュー１２の回転が停止している場合に、シリンダ１１内にゴムが滞留していると判断するように構成することもできる。これは、ゴムが塊からシート状になって排出される連続体であることから、何れかのセンサが感知信号を出力していることが、押出機内にゴムが存在していることの条件になることに着目したものである。   In addition, this invention is not limited to the said embodiment, The determination result whether the screw 12 rotated specified rotation speed after the rubber | gum 31 was supplied to the hopper 14 mentioned above, the pressure sensor 25, a rubber sheet You may comprise so that the stay of rubber | gum may be detected more reliably by using together with the sensing output of either sensor 26,27. Further, the rotation of the screw 12 of the rubber extruder 3 is stopped while any of the hopper supply sensors 23 and 24, the pressure sensor 25, and the rubber sheet sensors 26 and 27 detects the presence of rubber or rubber sheet. It can also be configured that it is determined that the rubber stays in the cylinder 11. This is a continuous body in which the rubber is discharged from the lump in the form of a sheet, so that any sensor outputs a sensing signal on the condition that rubber is present in the extruder. It pays attention to becoming.

本発明の実施形態に係るローラヘッド押出機の構成を示す図である。It is a figure which shows the structure of the roller head extruder which concerns on embodiment of this invention. 本実施形態に係るゴム押出機がゴムの滞留を検出する手順のフローチャートである。It is a flowchart of the procedure in which the rubber extruder which concerns on this embodiment detects the stay of rubber | gum.

符号の説明Explanation of symbols

１・・・ゴム押出機、３・・・制御装置、３・・・タイマー、５・・・カウンタ、１１・・・シリンダ、１２・・・スクリュー、２１・・・ドグ、２２・・・近接センサ、２３・・・発光素子、２４・・・受光素子。   DESCRIPTION OF SYMBOLS 1 ... Rubber extruder, 3 ... Control apparatus, 3 ... Timer, 5 ... Counter, 11 ... Cylinder, 12 ... Screw, 21 ... Dog, 22 ... Proximity Sensor, 23... Light emitting element, 24.

Claims (2)

ホッパーを通してシリンダ内に供給されたゴムを、シリンダ内に配置されたスクリューを規定数回転させることで押出すようにしたゴム押出機であって、
前記スクリューの回転速度が所定値となるように前記スクリューを回転させる回転手段と、前記ホッパーにゴムが供給されたことを検出するゴム供給検出手段と、前記スクリューの回転数を検出する回転数検出手段と、時間を計測する時間計測手段と、前記回転手段が動作している状態で前記ゴム供給検出手段がゴムを検出したとき、前記回転数検出手段及び時間計測手段の動作を開始させる手段と、前記時間計測手段の計測値が前記規定数を前記所定値で除算した値に到達したとき、前記回転数検出手段の検出値が前記規定数に到達していない場合に、前記シリンダ内のゴムが滞留していると判断する手段とを備えたことを特徴とするゴム押出機。 Rubber supplied into the cylinder through a hopper, a rubber extruder screw disposed in the cylinder was set to be extruded by rotating Tadashi constant,
Rotating means for rotating the screw so that the rotational speed of the screw becomes a predetermined value, rubber supply detecting means for detecting that rubber is supplied to the hopper, and rotational speed detection for detecting the rotational speed of the screw Means, time measuring means for measuring time, and means for starting the operation of the rotational speed detecting means and the time measuring means when the rubber supply detecting means detects rubber while the rotating means is operating If, when the measured value of said time measuring means has reached the value obtained by dividing the provisions constant at the predetermined value, when the detected value of the rotational speed detecting means has not reached the said regulations constant, within the cylinder A rubber extruder comprising: means for determining that the rubber is stagnant. ホッパーを通してシリンダ内に供給されたゴムを、シリンダ内に配置されたスクリューを規定数回転させることで押出すようにしたゴム押出機の前記シリンダ内のゴムの滞留を検出する方法であって、
前記スクリューの回転速度が所定値となるように前記スクリューを回転させる回転工程と、前記ホッパーにゴムが供給されたことを検出する工程と、前記回転工程の実行中に前記ホッパーにゴムが供給されたことを検出したときに、前記スクリューの回転数の計測及び時間の計測を開始する工程と、前記時間の計測値が前記規定数を前記所定値で除算した値に到達したとき、前記スクリューの回転数の計測値が前記規定数に到達していない場合に、前記シリンダ内のゴムが滞留していると判断する工程とからなることを特徴とするゴム押出機のゴム滞留検出方法。 Rubber supplied into the cylinder through a hopper, a method of detecting the accumulation of rubber in the cylinder of the rubber extruder to extrude a screw disposed in the cylinder by rotating Tadashi constant,
A rotation step of rotating the screw so that a rotation speed of the screw becomes a predetermined value, a step of detecting that rubber is supplied to the hopper, and rubber is supplied to the hopper during the execution of the rotation step. and that upon detection of a, a step of initiating the rotation speed of the measurement and the time measurement of the screw, when the measured value of the time has reached the value obtained by dividing the provisions constant at the predetermined value, the screw If the measured value of the rotational speed has not reached the regulations constant, rubber retention method for detecting rubber extruder rubber in said cylinder, characterized in that comprising the step of determining that staying.
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JPH07108588A (en) * 1993-10-15 1995-04-25 Showa Electric Wire & Cable Co Ltd Controlling method of extrusion molding line
JP2000032787A (en) * 1998-07-10 2000-01-28 Japan Steel Works Ltd:The Load managing method for machine and extruder
JP2002113769A (en) * 2000-10-12 2002-04-16 Hitachi Zosen Corp Method for stopping extruder and safety device

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JPS4894777A (en) * 1972-03-21 1973-12-06
JPS60109656A (en) * 1983-11-14 1985-06-15 Mitsubishi Electric Corp Device for detecting breakage of shear pin
JPH07108588A (en) * 1993-10-15 1995-04-25 Showa Electric Wire & Cable Co Ltd Controlling method of extrusion molding line
JP2000032787A (en) * 1998-07-10 2000-01-28 Japan Steel Works Ltd:The Load managing method for machine and extruder
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