JP4002558B2 - Injection device with plunger - Google Patents

Injection device with plunger Download PDF

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JP4002558B2
JP4002558B2 JP2004122468A JP2004122468A JP4002558B2 JP 4002558 B2 JP4002558 B2 JP 4002558B2 JP 2004122468 A JP2004122468 A JP 2004122468A JP 2004122468 A JP2004122468 A JP 2004122468A JP 4002558 B2 JP4002558 B2 JP 4002558B2
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plunger
injection
universal joint
cylinder
molten material
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JP2005305684A (en
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悟春 西野
隆志 篠田
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株式会社名機製作所
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Description

本発明は、プランジャを備えた溶融材料の射出装置に関するものである。   The present invention relates to a molten material injection apparatus having a plunger.

特許文献１に示す予備可塑化式射出装置（プリプラ式射出装置）は、射出シリンダとプランジャとの間のクリアランスに入り込んだ樹脂を、プランジャストロークの後に設けた樹脂の抜き穴と掻取り用のスリーブとで排除し樹脂の固化による計量時の障害を防止するものである。   Patent Document 1 discloses a pre-plasticizing type injection device (prep plastic type injection device), in which a resin that has entered a clearance between an injection cylinder and a plunger is provided with a resin hole and a scraping sleeve provided after the plunger stroke. It prevents the trouble at the time of weighing due to solidification of the resin.

このように、プランジャと射出シリンダとの間のクリアランスに漏れ出す樹脂は、樹脂の種類や温度・圧力の条件により多少はあるが避けられず、皆無にすることは困難である。そこで、前記クリアランスを可及的に小さくして、樹脂の漏洩を少なくすることが要求される。しかしながら、前記クリアランスが小さいと、射出シリンダの熱による湾曲や射出シリンダと射出駆動装置であるピストンとの結合軸が取付け荷重等により撓むことに起因して、プランジャに齧りが発生する。さらに、齧ったプランジャを交換するためには、プランジャの周辺部材の多くを分解しなければならず、多大の工数と時間を要するのである。   As described above, the resin leaking into the clearance between the plunger and the injection cylinder is inevitable, depending on the type of resin and the conditions of temperature and pressure, but is difficult to eliminate at all. Therefore, it is required to make the clearance as small as possible to reduce resin leakage. However, if the clearance is small, the plunger is warped due to the bending of the injection cylinder due to heat and the coupling shaft between the injection cylinder and the piston serving as the injection drive device being bent due to the mounting load or the like. Furthermore, in order to replace the struck plunger, many of the peripheral members of the plunger must be disassembled, requiring a great deal of man-hours and time.

特開平９−８５７８７号公報（第１〜４頁、図１および図２）JP-A-9-85787 (pages 1 to 4, FIGS. 1 and 2)

本発明は、上記した問題を解決すべくなされたものであって、プランジャに齧りを発生させずかつ溶融材料の漏洩を可及的に少なくした射出装置を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an injection device that does not cause the plunger to bend and minimize the leakage of the molten material.

本発明は、プランジャを備えた溶融材料の射出装置において、プランジャはユニバーサルジョイントを介して駆動されるように構成された射出装置に関する。   The present invention relates to a molten material injection device including a plunger, and the plunger is configured to be driven via a universal joint.

本発明の射出装置によれば、プランジャに齧りを発生させずかつ溶融材料の漏洩を可及的に少なくすることができる。   According to the injection device of the present invention, it is possible to reduce the leakage of the molten material as much as possible without causing the plunger to bend.

図面に基づいて、本発明の実施の形態を詳細に説明する。図１は、本発明を実施する射出装置の縦断面図である。   Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of an injection apparatus for carrying out the present invention.

射出装置１は、予備可塑化式射出装置の要部である。プランジャ９は、鋼製の厚肉円筒であり外周面にヒータが捲着された射出シリンダ８の内孔に往復動可能に嵌挿され、射出シリンダ８内部のプランジャ９前方に貯留された溶融材料６を押出す。プランジャ９の後半部は縮径されてプランジャ基部１０となり、プランジャ基部１０の端部は二股になっている。この二股部には継手１２の一端部に設けた扁平部が嵌挿され、ピン１１が両者を揺動可能に軸支している。   The injection device 1 is a main part of a preliminary plasticizing type injection device. The plunger 9 is a thick steel cylinder, and is inserted into the inner hole of the injection cylinder 8 having a heater attached to the outer peripheral surface thereof so as to be able to reciprocate, and the molten material stored in front of the plunger 9 inside the injection cylinder 8. 6 is extruded. The latter half of the plunger 9 is reduced in diameter to become the plunger base 10, and the end of the plunger base 10 is bifurcated. A flat portion provided at one end of the joint 12 is fitted into the bifurcated portion, and a pin 11 pivotally supports both of them so as to be able to swing.

継手１２の他端部には、前記一端部の扁平部とは直交する面を有する扁平部が設けられている。この扁平部は、駆動軸１４の一端部に設けた二股部に嵌挿され、ピン１３により該扁平部と二股部は揺動可能に軸支されている。駆動軸１４の他端部は、油圧シリンダ等からなる射出駆動装置１６に接続されている。駆動軸１４の一端部と他端部との間の中間部には、射出シリンダ８と射出駆動装置１６とを連結する連結箱２１の内面に摺動して駆動軸１４を案内・支持する摺動部１５が設けられている。   The other end portion of the joint 12 is provided with a flat portion having a surface orthogonal to the flat portion of the one end portion. The flat portion is fitted into a bifurcated portion provided at one end of the drive shaft 14, and the flat portion and the bifurcated portion are pivotally supported by a pin 13 so as to be swingable. The other end of the drive shaft 14 is connected to an injection drive device 16 composed of a hydraulic cylinder or the like. A slide that guides and supports the drive shaft 14 by sliding on the inner surface of a connection box 21 that connects the injection cylinder 8 and the injection drive device 16 is provided at an intermediate portion between one end and the other end of the drive shaft 14. A moving part 15 is provided.

上記のように、プランジャ基部１０、ピン１１、継手１２、ピン１３および駆動軸１４からユニバーサルジョイント２０が構成される。それにより、駆動軸１４の軸心とプランジャ基部１０の軸心とが、射出シリンダ８の熱による湾曲や射出シリンダ８や射出駆動装置１６の取付け荷重等による撓みに起因して、偏芯していたとしても、プランジャ９を射出シリンダ８の内孔の軸芯と一致した方向に駆動することができる。そのため、プランジャ９の外周面に齧りを発生させないとともに、プランジャ９の外周面と射出シリンダ８の内孔面とのクリアランスを、３０ミクロンメータ程度に小さくして、溶融材料６の漏洩を可及的に少なくすることができた。   As described above, the universal joint 20 includes the plunger base 10, the pin 11, the joint 12, the pin 13, and the drive shaft 14. As a result, the axis of the drive shaft 14 and the axis of the plunger base 10 are eccentric due to the bending of the injection cylinder 8 due to the heat or the bending due to the mounting load of the injection cylinder 8 or the injection drive device 16. Even so, the plunger 9 can be driven in a direction that coincides with the axis of the inner hole of the injection cylinder 8. For this reason, the outer peripheral surface of the plunger 9 is not distorted, and the clearance between the outer peripheral surface of the plunger 9 and the inner hole surface of the injection cylinder 8 is reduced to about 30 μm so that the molten material 6 can be leaked as much as possible. It was possible to reduce it.

連結箱２１の側面には、横長の操作窓１７が設けられている。操作窓１７は、プランジャ９が略後退限度に位置するように射出駆動装置１６を操作したとき、ユニバーサルジョイント２０が現れるような位置と形状で設けられている。継手１２の外周面には、等円周間隔に複数の操作穴１９からなる列が複数列設けられ、列毎に操作穴１９の位置角度を相違させている。また、連結箱２１の前方下面に設けられた排出窓１８は、僅かではあるがプランジャ９から漏洩する溶融材料６を落下・排出させる。   A horizontally long operation window 17 is provided on the side surface of the connection box 21. The operation window 17 is provided in such a position and shape that the universal joint 20 appears when the injection driving device 16 is operated so that the plunger 9 is positioned at the substantially backward limit. A plurality of rows of operation holes 19 are provided at equal circumferential intervals on the outer peripheral surface of the joint 12, and the position angles of the operation holes 19 are different for each row. Further, the discharge window 18 provided on the front lower surface of the junction box 21 drops and discharges the molten material 6 leaking from the plunger 9 although it is slight.

プランジャ９を齧りや磨耗等のため交換するときは、ユニバーサルジョイント２０が操作窓１７に現れるように射出駆動装置１６を操作し、適宜な操作穴１９に棒材を順次挿入して継手１２を回転させ、ピン１１およびピン１３を取り外す。そして、継手１２を操作窓１７から取出した後、プランジャ９を引き出す。なお、ピン１３のみを取り外し、ピン１１は取り外さずにし、継手１２をピン１１で揺動させながらプランジャ９を射出シリンダ８から引き抜くことも効果的である。   When the plunger 9 is replaced due to turning or wear, the injection drive device 16 is operated so that the universal joint 20 appears in the operation window 17, and the joint 12 is rotated by sequentially inserting rods into appropriate operation holes 19. To remove the pin 11 and the pin 13. And after taking out the coupling 12 from the operation window 17, the plunger 9 is pulled out. It is also effective to pull out the plunger 9 from the injection cylinder 8 while removing only the pin 13 and not removing the pin 11 and swinging the joint 12 by the pin 11.

次に、射出装置１の成形時の作動について射出装置１を構成する機器とともに説明する。切換弁５は、射出シリンダ８の前端面に固着されたシリンダヘッド７内に設けられ、溶融材料６の流路を、可塑化装置３から射出シリンダ８へあるいは、射出シリンダ８からノズル部４へと切り換えるものである。切換弁装置２は切換弁５を９０度回動させるもので、油圧シリンダ等とリンク機構からなり、シリンダヘッド７に取り付けられる。   Next, the operation at the time of molding of the injection device 1 will be described together with the devices constituting the injection device 1. The switching valve 5 is provided in a cylinder head 7 fixed to the front end surface of the injection cylinder 8, and the flow path of the molten material 6 is transferred from the plasticizing device 3 to the injection cylinder 8 or from the injection cylinder 8 to the nozzle portion 4. And switching. The switching valve device 2 rotates the switching valve 5 by 90 degrees, and includes a hydraulic cylinder and a link mechanism, and is attached to the cylinder head 7.

可塑化装置３は、樹脂や金属またはそれらの混合物等からなる成形材料を溶融・混錬して流動性のある溶融材料６となす。溶融材料６は、切換弁５が一の切換状態のとき、射出シリンダ８に供給されプランジャ９の前方に貯留される。その後、切換弁５が他の切換状態に切り換えられ、溶融材料６は射出駆動装置１６で前進駆動されるプランジャ９によりノズル部４を介して、図示しない金型に射出・充填される。   The plasticizing device 3 melts and kneads a molding material made of resin, metal, or a mixture thereof to form a fluid molten material 6. The molten material 6 is supplied to the injection cylinder 8 and stored in front of the plunger 9 when the switching valve 5 is in one switching state. Thereafter, the switching valve 5 is switched to another switching state, and the molten material 6 is injected and filled into a mold (not shown) through the nozzle portion 4 by the plunger 9 driven forward by the injection driving device 16.

この発明は以上説明した実施例に限定されるものではなく、発明の趣旨を逸脱しない範囲内において種々の変更を付加して実施することができる。     The present invention is not limited to the embodiments described above, and various modifications can be added and implemented without departing from the spirit of the invention.

本発明を実施する射出装置の縦断面図である。It is a longitudinal cross-sectional view of the injection device which implements this invention.

符号の説明Explanation of symbols

１ 射出装置
２ 切換弁装置
３ 可塑化装置
４ ノズル部
５ 切換弁
６ 溶融材料
７ シリンダヘッド
８ 射出シリンダ
９ プランジャ
１０ プランジャ基部
１１，１３ ピン
１２ 継手
１４ 駆動軸
１５ 摺動部
１６ 射出駆動装置
１７ 操作窓
１８ 排出窓
１９ 操作穴
２０ ユニバーサルジョイント
２１ 連結箱 DESCRIPTION OF SYMBOLS 1 Injection apparatus 2 Switching valve apparatus 3 Plasticizing apparatus 4 Nozzle part 5 Switching valve 6 Molten material 7 Cylinder head 8 Injection cylinder 9 Plunger 10 Plunger base 11, 13 Pin 12 Joint 14 Drive shaft 15 Sliding part 16 Injection drive apparatus 17 Operation Window 18 Discharge window 19 Operation hole 20 Universal joint 21 Connection box

Claims (2)

プランジャを備えた溶融材料の射出装置において、
前記プランジャはユニバーサルジョイントを介して射出駆動装置で駆動され、前記ユニバーサルジョイントの前記射出駆動装置側は前記プランジャを往復動可能に嵌挿する射出シリンダを前記射出駆動装置と連結する連結箱に摺動部で案内・支持されるように構成されたことを特徴とする射出装置。 In a molten material injection device provided with a plunger,
The plunger is driven by an injection driving device via a universal joint, and the injection driving device side of the universal joint slides on a connecting box that connects an injection cylinder for reciprocating the plunger to the injection driving device. injection apparatus characterized by being configured to so that is guided and supported in parts. 前記連結箱は、前記ユニバーサルジョイントを収納するとともに、連結箱の側面にユニバーサルジョイントとプランジャを分解・分離し取出すことのできる操作窓が設けられた請求項１に記載の射出装置。 2. The injection device according to claim 1, wherein the connection box accommodates the universal joint and is provided with an operation window on a side surface of the connection box that can disassemble and separate the universal joint and the plunger.
JP2004122468A 2004-04-19 2004-04-19 Injection device with plunger Expired - Fee Related JP4002558B2 (en)

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JP4002558B2 true JP4002558B2 (en) 2007-11-07

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CN115122566B (en) * 2022-08-31 2022-12-27 佛山市顺德区震德塑料机械有限公司 Horizontal injection molding machine

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