JP2009078361A - Segment screw for twin screw extruder - Google Patents

Segment screw for twin screw extruder Download PDF

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Publication number
JP2009078361A
JP2009078361A JP2007247183A JP2007247183A JP2009078361A JP 2009078361 A JP2009078361 A JP 2009078361A JP 2007247183 A JP2007247183 A JP 2007247183A JP 2007247183 A JP2007247183 A JP 2007247183A JP 2009078361 A JP2009078361 A JP 2009078361A
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Prior art keywords
segment
screw
twin
screw shaft
piece
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JP2007247183A
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Japanese (ja)
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Junichi Iwai
淳一 岩井
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Japan Steel Works Ltd
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Japan Steel Works Ltd
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Priority to JP2007247183A priority Critical patent/JP2009078361A/en
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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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/64—Screws with two or more threads
    • B29C48/645—Screws with two or more threads neighbouring threads and channels having identical configurations
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/535—Screws with thread pitch varying along the longitudinal axis
    • 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
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/57—Screws provided with kneading disc-like elements, e.g. with oval-shaped elements
    • 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
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/63—Screws having sections without mixing elements or threads, i.e. having cylinder shaped sections

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a screw shaft from being damaged by connecting each segment screw set on the screw shaft by a projection and a recess to improve rigidity. <P>SOLUTION: In the segment screw for a twin screw extruder, a large number of segment pieces (2) are inserted into the periphery of the screw shaft (1), each segment piece (2) is connected integrally by the connection of the recess (30) and the projection (31) to improve rigidity, and the screw shaft (1) is prevented from being damaged. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、二軸押出機用セグメントスクリュに関し、特に、スクリュ軸体の外周に設けられる多数の各セグメントピースの一部もしくは全ての間を各セグメントピースに設けられた凸部と凹部によって接続させることにより、各セグメントピース側の剛性を向上させ、スクリュ軸体の損傷を防止するための新規な改良に関する。   The present invention relates to a segment screw for a twin-screw extruder, and in particular, a part or all of a large number of segment pieces provided on the outer periphery of a screw shaft body are connected by projections and recesses provided on each segment piece. Thus, the present invention relates to a novel improvement for improving the rigidity of each segment piece and preventing the screw shaft body from being damaged.

一般に、合成樹脂原料を溶融混練加工するための例えば、二軸のスクリュ式混練押出機において、シリンダに挿入され回転駆動されるスクリュは、多くの場合、加工条件の異なる合成樹脂原料に対応して容易にスクリュの構成を変更可能なように、また、摩耗損傷した箇所を部分的に交換可能なように、スクリュ軸体と複数個のセグメント化されたセグメントピースとにより構成されるセグメントスクリュが採用されている。前記スクリュ軸体は断面が円形の棒状部材であり、回転駆動機との連結端部側の所定長すなわち鍔までを除いて先端まで、全周にわたり多数のインボリュート形状の溝すなわちインボリュートスプラインが、軸方向に直線的に形成されている。   In general, for example, in a biaxial screw-type kneading extruder for melting and kneading synthetic resin raw materials, a screw inserted into a cylinder and driven to rotate corresponds to synthetic resin raw materials having different processing conditions in many cases. A segment screw composed of a screw shaft and a plurality of segmented segment pieces is used so that the screw configuration can be easily changed and the wear-damaged part can be partially replaced. Has been. The screw shaft body is a rod-shaped member having a circular cross section, and a plurality of involute-shaped grooves, i.e., involute splines, are arranged on the entire circumference up to the tip except for a predetermined length on the connecting end side with the rotary drive, i.e., the flange. It is formed linearly in the direction.

前述の従来構成のスクリュ軸体と各セグメントピースとからなるセグメントスクリュ１０は例えば、特許文献１に開示されているが、具体的には、図４及び図５で示されるように構成され、スクリュ軸体１の外周に形成されたインボリュートスプライン１ａには、セグメントピース２が多数個直列状に挿入されている。   The segment screw 10 including the above-described conventional screw shaft body and each segment piece is disclosed in, for example, Patent Document 1, but specifically, as shown in FIGS. A large number of segment pieces 2 are inserted in series in an involute spline 1a formed on the outer periphery of the shaft body 1.

すなわち、近時、スクリュ式混練押出機は、徐々に高性能化され、小型で大容量処理能力を実現するために、セグメントスクリュは大きい回転トルクを許容することが要求されている。このような要求に対して、前述のセグメントスクリュとしてセグメント化されたセグメントピースとスクリュ軸体とを組合せて構成することにより、スクリュ回転トルクに耐えられるように構成されている。   That is, recently, the screw-type kneading extruder is gradually improved in performance, and in order to achieve a small capacity and a large capacity, the segment screw is required to allow a large rotational torque. In response to such a requirement, a segment piece segmented as the aforementioned segment screw and a screw shaft body are combined to be configured to withstand screw rotation torque.

特開２００５−２２０９１号公報JP 2005-22091 A

従来の二軸押出機用セグメントスクリュは、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、セグメントスクリュにおける各セグメントピースは、軸方向長さが０．５Ｌ／Ｄ〜２Ｌ／Ｄ（Ｌは軸長さ、Ｄはスクリュ径）で多数の細切れに切断され、混練の目的に合わせて種々の形状のものがあり、スクリュ軸体と各セグメントピースの組合わせによってセグメントスクリュ全体の剛性が決定されている。
しかしながら、従来構成の各セグメントピースの両端面は、前面が平坦であり、軸方向での各セグメントピースの前後関係の繋がりが全くなく、その剛性は著しく低く、混練時における各セグメントピースには大きい力は作用していない。
また、このセグメントピースの形状を２Ｌ／Ｄ以上に長くして剛性を向上させることも考えられるが、その場合には、製作が困難であること、セグメントとした意味が失われることが問題であった。 Since the conventional segment screw for a twin-screw extruder is configured as described above, the following problems exist.
That is, each segment piece in the segment screw has an axial length of 0.5 L / D to 2 L / D (L is the axial length, D is the screw diameter), and is cut into a large number of pieces to suit the purpose of kneading. There are various shapes, and the rigidity of the entire segment screw is determined by the combination of the screw shaft body and each segment piece.
However, both end surfaces of each segment piece of the conventional configuration are flat at the front, there is no connection in the axial direction of each segment piece, its rigidity is remarkably low, and each segment piece during kneading is large The force is not acting.
In addition, it may be possible to improve the rigidity by making the shape of this segment piece 2L / D or more. However, in this case, the problem is that the manufacture is difficult and the meaning of the segment is lost. It was.

本発明による二軸押出機用セグメントスクリュは、スクリュ軸体と、前記スクリュ軸体の外周に挿入された多数のセグメントピースと、よりなる二軸押出機用セグメントスクリュにおいて、前記各セグメントピースの中の一部もしくは全てを前記セグメントピースの端面に設けた凹部と凸部によって互いに直列接続した構成であり、また、前記セグメントピースの第１端面には前記凹部が形成され、前記セグメントピースの第２端面には前記凸部が設けられている構成であり、また、前記凹部及び凸部は、各々１対で形成され、前記各端面で前記各凹部同志及び各凸部同志は互いに１８０度対向配置されている構成である。   A segment screw for a twin-screw extruder according to the present invention is a segment screw for a twin-screw extruder comprising a screw shaft body and a number of segment pieces inserted on the outer periphery of the screw shaft body. Are partially connected in series by a recess and a protrusion provided on the end surface of the segment piece, and the recess is formed on the first end surface of the segment piece, and the second of the segment piece The convex portion is provided on the end surface, and the concave portion and the convex portion are each formed in a pair, and the concave portions and the convex portions are opposed to each other by 180 degrees on the respective end surfaces. It is the structure which is done.

本発明による二軸押出機用セグメントスクリュは、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、各セグメントピースの端面に凸部又は凹部が形成されているため、各セグメントピースは、凸部と凹部の嵌合によって一体的に接続され、その剛性を従来よりも大幅に向上させることができ、スクリュ全体の剛性をも向上させて、スクリュ軸体に作用する力を減少させ、スクリュ軸体に対する損傷を防止することができる。
また、前述のように、セグメントスクリュ全体の剛性を従来よりも大幅に向上できることにより、スクリュ軸体に作用する力を２０％から３０％減少させ、スクリュ軸体の寿命を従来よりも著しく延長することができる。 Since the segment screw for a twin screw extruder according to the present invention is configured as described above, the following effects can be obtained.
That is, since the convex portion or the concave portion is formed on the end face of each segment piece, each segment piece is integrally connected by the fitting of the convex portion and the concave portion, and its rigidity can be greatly improved as compared with the conventional case. It is possible to improve the rigidity of the entire screw, reduce the force acting on the screw shaft body, and prevent damage to the screw shaft body.
Further, as described above, the rigidity of the entire segment screw can be greatly improved as compared with the conventional case, so that the force acting on the screw shaft body is reduced by 20% to 30%, and the life of the screw shaft body is significantly extended compared to the conventional case. be able to.

本発明は、スクリュ軸体の外周に設けられる多数の各セグメントピースの一部もしくは全ての間を各セグメントピースに設けられた凸部と凹部によって接続させることにより、各セグメントピース側の剛性を向上させ、スクリュ軸体の損傷を防止するようにした二軸押出機用セグメントスクリュを提供することを目的とする。   The present invention improves the rigidity on the side of each segment piece by connecting some or all of the many segment pieces provided on the outer periphery of the screw shaft body by the convex and concave portions provided on each segment piece. An object of the present invention is to provide a segment screw for a twin screw extruder that prevents damage to the screw shaft body.

以下、図面と共に本発明による二軸押出機用セグメントスクリュ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。
図１は本発明による二軸押出機用セグメントスクリュを用いた二軸押出機の要部を示す断面図、図２は図１のセグメントピースを示す拡大図、図３は図２の側面図である。 Hereinafter, preferred embodiments of a segment screw for a twin-screw extruder according to the present invention will be described with reference to the drawings.
In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
FIG. 1 is a sectional view showing a main part of a twin screw extruder using a segment screw for a twin screw extruder according to the present invention, FIG. 2 is an enlarged view showing a segment piece of FIG. 1, and FIG. 3 is a side view of FIG. is there.

図１において符号２０で示されるものは二軸押出機のシリンダであり、このシリンダ２０内には一対のセグメントスクリュ１０（図では一方のみ示されている）が互いに噛み合い、又は、非噛み合い状態で回転自在に設けられている。
前記セグメントスクリュ１０は、図２及び図３に示されているように、前記スクリュ軸体１の外周に形成されたインボリュートスプライン１ａ上で、このインボリュートスプライン１ａの形状に対応した形状の内面２ａを有する多数のセグメントピース２が軸方向に沿って嵌め込み式に挿入して設けられている。 1 is a cylinder of a twin-screw extruder, and a pair of segment screws 10 (only one is shown in the figure) are engaged with each other or in a non-engaged state. It is provided rotatably.
As shown in FIGS. 2 and 3, the segment screw 10 has an inner surface 2 a having a shape corresponding to the shape of the involute spline 1 a on the involute spline 1 a formed on the outer periphery of the screw shaft body 1. A large number of segment pieces 2 are provided so as to be fitted in the axial direction.

前記各セグメントスクリュ１０の一部もしくは全て（すなわち、全てのセグメントピース２を凹部３０と凸部３１で噛み合い状に接続して一体的とする場合の他に、最も必要とするニーディング部のみを凹部３０と凸部３１で接続し、他は従来通りとすることもある）の第１、第２端面２ｂ、２ｃには各々複数の凹部３０と凸部３１が形成されている。尚、図１で示される各セグメントピース２のうち最も左側に位置するセグメントピース２と最も右側に位置するセグメントピース２は、一端面のみしか凹部３０又は凸部３１が形成されていない。
従って、前記スクリュ軸体１上の各セグメントピース２は、各セグメントピース２を直列配置した場合に、前記凹部３０と凸部３１とが互いに嵌合し、互いに一体的に接続された剛体を形成している。 A part or all of each of the segment screws 10 (that is, all the segment pieces 2 are meshed with the concave portions 30 and the convex portions 31 so as to be integrated with each other, only the kneading portion that is most necessary A plurality of concave portions 30 and convex portions 31 are formed on the first and second end surfaces 2b and 2c of the concave portion 30 and the convex portion 31, respectively. In addition, the segment piece 2 located on the leftmost side and the segment piece 2 located on the rightmost side of each segment piece 2 shown in FIG. 1 have the concave portion 30 or the convex portion 31 formed only at one end surface.
Therefore, each segment piece 2 on the screw shaft 1 forms a rigid body in which the concave portion 30 and the convex portion 31 are fitted to each other and integrally connected to each other when the segment pieces 2 are arranged in series. is doing.

前述の場合、前記各端面２ｂ、２ｃに形成された前記凹部３０又は凸部３１は、各々一対で形成されており、図２及び図３で示されるように各凹部３０同志及び各凸部３１同志は互いに１８０度対向位置に一対で形成されている。
従って、前記各セグメントスクリュ１０が、前記凹部３０と凸部３１の噛み合いの嵌合接続によって一体的に形成されていることにより、各セグメントピース２における剛性向上によってセグメントスクリュ１０全体の剛性が向上し、スクリュ軸体１に作用する力（２０％から３０％）を減少させ、スクリュ軸体１の損傷発生を防止することができる。 In the case described above, the concave portions 30 or the convex portions 31 formed on the end faces 2b and 2c are formed in pairs, and the concave portions 30 and the convex portions 31 are formed as shown in FIGS. The comrades are formed in a pair at positions opposite to each other by 180 degrees.
Therefore, since each segment screw 10 is integrally formed by fitting connection of the concave portion 30 and the convex portion 31, the rigidity of the segment screw 10 as a whole is improved by the rigidity improvement in each segment piece 2. The force (20% to 30%) acting on the screw shaft 1 can be reduced, and damage to the screw shaft 1 can be prevented.

本発明による二軸押出機用セグメントスクリュを用いた二軸押出機の要部を示す断面図である。It is sectional drawing which shows the principal part of the twin-screw extruder using the segment screw for twin-screw extruders by this invention. 図１のセグメントピースを示す側面図である。It is a side view which shows the segment piece of FIG. 図２のセグメントピースの右側面図である。It is a right view of the segment piece of FIG. 従来のセグメントピースを示す側面図である。It is a side view which shows the conventional segment piece. 図４の右側面図である。FIG. 5 is a right side view of FIG. 4.

符号の説明Explanation of symbols

１ スクリュ軸体
２ セグメントピース
２ａ 内面
１ａ インボリュートスプライン
２ｂ 第１端面
２ｃ 第２端面
１０ セグメントスクリュ
２０ シリンダ
３０ 凹部
３１ 凸部 DESCRIPTION OF SYMBOLS 1 Screw shaft body 2 Segment piece 2a Inner surface 1a Involute spline 2b 1st end surface 2c 2nd end surface 10 Segment screw 20 Cylinder 30 Concave part 31 Convex part

Claims (3)

スクリュ軸体(1)と、前記スクリュ軸体(1)の外周に挿入された多数のセグメントピース(2)と、よりなる二軸押出機用セグメントスクリュにおいて、
前記各セグメントピース(2)の中の一部もしくは全てを前記セグメントピース(2)の端面に設けた凹部(30)と凸部(31)によって互いに直列接続した構成よりなることを特徴とする二軸押出機用セグメントスクリュ。 In a screw shaft for a twin screw extruder comprising a screw shaft body (1), a number of segment pieces (2) inserted on the outer periphery of the screw shaft body (1),
Two or more of the segment pieces (2) are configured to be connected in series with each other by a concave portion (30) and a convex portion (31) provided on an end surface of the segment piece (2). Segment screw for shaft extruder. 前記セグメントピース(2)の第１端面(2b)には前記凹部(30)が形成され、前記セグメントピース(2)の第２端面(2c)には前記凸部(31)が設けられていることを特徴とする請求項１記載の二軸押出機用セグメントスクリュ。   The concave portion (30) is formed on the first end surface (2b) of the segment piece (2), and the convex portion (31) is provided on the second end surface (2c) of the segment piece (2). The segment screw for a twin-screw extruder according to claim 1. 前記凹部(30)及び凸部(31)は、各々１対で形成され、前記各端面(2b,2c)で前記各凹部(30)同志及び各凸部(31)同志は互いに１８０度対向配置されていることを特徴とする請求項１記載の二軸押出機用セグメントスクリュ。   The concave portion (30) and the convex portion (31) are each formed in a pair, and the concave portions (30) and the convex portions (31) are arranged to face each other at 180 degrees on the end faces (2b, 2c). The segment screw for a twin-screw extruder according to claim 1, wherein the segment screw is used.
JP2007247183A 2007-09-25 2007-09-25 Segment screw for twin screw extruder Pending JP2009078361A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015163320A1 (en) * 2014-04-22 2015-10-29 宏平 澤 Kneading device
DE102015006479A1 (en) * 2015-05-22 2016-11-24 Reifenhäuser GmbH & Co. KG Maschinenfabrik Screw for use in an extruder and extruder
CN106426867A (en) * 2016-09-20 2017-02-22 四川中旺科技有限公司 Tooth-shaped disk, tooth-shaped disk assembly, screw assembly and double-screw assembly
EP3305501A1 (en) 2016-10-10 2018-04-11 Reifenhäuser GmbH & Co. KG Maschinenfabrik Screw for use in an extruder and extruder

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JPS4920935B1 (en) * 1969-06-11 1974-05-28
JPS6440506U (en) * 1987-09-01 1989-03-10
JPH081660A (en) * 1994-06-20 1996-01-09 Kobe Steel Ltd Continuously kneading machine, and rotor segment-removing tool thereof
JP2005022091A (en) * 2003-06-30 2005-01-27 Japan Steel Works Ltd:The Screw shaft

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JPS4920935B1 (en) * 1969-06-11 1974-05-28
JPS6440506U (en) * 1987-09-01 1989-03-10
JPH081660A (en) * 1994-06-20 1996-01-09 Kobe Steel Ltd Continuously kneading machine, and rotor segment-removing tool thereof
JP2005022091A (en) * 2003-06-30 2005-01-27 Japan Steel Works Ltd:The Screw shaft

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015163320A1 (en) * 2014-04-22 2015-10-29 宏平 澤 Kneading device
JP2015205464A (en) * 2014-04-22 2015-11-19 宏平 澤 Kneader
CN106232312A (en) * 2014-04-22 2016-12-14 泽宏平 Kneading device
KR20160145593A (en) * 2014-04-22 2016-12-20 코헤이 사와 Kneading device
RU2675903C2 (en) * 2014-04-22 2018-12-25 Кохеи САВА Mixing device
US10220544B2 (en) 2014-04-22 2019-03-05 Kohei Sawa Kneading apparatus having plurality of segmented parts
KR102253419B1 (en) 2014-04-22 2021-05-17 코헤이 사와 Kneading device
DE102015006479A1 (en) * 2015-05-22 2016-11-24 Reifenhäuser GmbH & Co. KG Maschinenfabrik Screw for use in an extruder and extruder
CN106426867A (en) * 2016-09-20 2017-02-22 四川中旺科技有限公司 Tooth-shaped disk, tooth-shaped disk assembly, screw assembly and double-screw assembly
EP3305501A1 (en) 2016-10-10 2018-04-11 Reifenhäuser GmbH & Co. KG Maschinenfabrik Screw for use in an extruder and extruder
DE102016011978A1 (en) 2016-10-10 2018-04-12 Reifenhäuser GmbH & Co. KG Maschinenfabrik Screw for use in an extruder and extruder

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