CN107139424B - Full smooth double screw extruder screw rotor - Google Patents

Full smooth double screw extruder screw rotor Download PDF

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Publication number
CN107139424B
CN107139424B CN201710549383.1A CN201710549383A CN107139424B CN 107139424 B CN107139424 B CN 107139424B CN 201710549383 A CN201710549383 A CN 201710549383A CN 107139424 B CN107139424 B CN 107139424B
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China
Prior art keywords
arc
screw rotor
point
left screw
rotor
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CN201710549383.1A
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Chinese (zh)
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CN107139424A (en
Inventor
王君
陆亚彪
刘乃铭
杨晓莹
罗陈杰
沙润东
蒲可欣
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China University of Petroleum East China
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China University of Petroleum East China
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Priority to CN201710549383.1A priority Critical patent/CN107139424B/en
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Classifications

    • 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
    • B29C48/59—Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw
    • 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
    • B29C48/402—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 the screws having intermeshing parts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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

Abstract

The invention discloses a full-smooth double-screw extruder screw rotor, which comprises a left screw rotor (1) and a right screw rotor (2), wherein a section molded line (201) of the left screw rotor (1) comprises 6 sections of circular arcs, smooth connection can be realized between adjacent sections of circular arcs, and the left screw rotor (1) is full-smooth; the left screw rotor (1) and the right screw rotor (2) are identical; during operation, the left screw rotor and the right screw rotor can be properly meshed. The invention improves the stress characteristic of the rotor, reduces the abrasion generated by the rotor in the meshing process, and obviously improves the service life of the rotor; and the composition curve of the full-smooth screw rotor is simple and only comprises an arc curve, so that the processing and the production are convenient.

Description

Full smooth double screw extruder screw rotor
Technical Field
The invention relates to a homodromous double-screw extruder, in particular to a full smooth screw rotor suitable for a conveying section of the homodromous double-screw extruder.
Background
The double-screw extruder is equipment for homogenizing components of materials in a molten state, has the advantages of high working reliability, strong self-lubricating capability and good mixing performance, and is mainly applied to the polymer processing industry; the core component of the conveying section is two screw rotors which are arranged side by side, and the meshing degree of the screw rotors directly influences the sealing performance and the mechanical property of the extruder; the section molded line of the conventional screw rotor has a non-smooth point, the point is meshed with the curve in the working process, and stress concentration and abrasion are easy to occur at the non-smooth point, so that the service life of the screw rotor is reduced. Meanwhile, in order to enrich the types of screw rotors of the double-screw extruder, the invention provides a novel fully-meshed and fully-smooth screw rotor.
Disclosure of Invention
Aiming at the problems, the invention provides a full-smooth double-screw extruder screw rotor, wherein the section profile of the screw rotor comprises 6 sections of circular arcs, and 4 sections of circular arcs are adopted to smoothly connect the top circle and the root circle, so that the section profile of the full-smooth screw rotor is obtained. The screw rotor generated by the section molded line of the screw rotor not only can meet the requirement of correct engagement, but also can realize smooth transition of the tooth surface, so that the abrasion resistance of the screw rotor is improved, the thermal deformation and stress characteristics of the screw rotor are improved, the strength and the service life of the screw rotor are improved, and the screw rotor can be suitable for the operation working condition with higher rotating speed. The section profile of the screw rotor of the conveying section of the proposed homodromous double-screw extruder has important significance for improving the performance of the double-screw extruder.
The technical scheme adopted by the invention is as follows:
a fully smooth twin screw extruder screw rotor comprising: a left screw rotor (1) and a right screw rotor (2); smooth connection can be realized between each section of adjacent curves on the section molded line (201) of the left screw rotor (1), and the left screw rotor (1) is completely smooth; the section molded line (201) of the left screw rotor (1) comprises 6 sections of circular arcs, and the sections are sequentially as follows in the anticlockwise direction: a first arc AB, a root arc BC, a second arc CD, a third arc DE, an addendum arc EF and a fourth arc FA; the circle center of the first arc AB is the point Q, and the radius is R 4 The method comprises the steps of carrying out a first treatment on the surface of the The center of the root arc BC is the rotation center O point of the left screw rotor (1), and the radius is R 3 The method comprises the steps of carrying out a first treatment on the surface of the The center of the second arc CD is the point P, and the radius is R 4 The method comprises the steps of carrying out a first treatment on the surface of the The circle center of the third arc DE is a point Q, and the radius is r; the circle center of the tooth top arc EF is the rotation center O point of the left screw rotor (1), and the radius is R 1 The method comprises the steps of carrying out a first treatment on the surface of the The center of the fourth arc FA is the point P, and the radius is r; the pitch circle center of the left screw rotor (1) is the center of rotation O point, and the radius is R 2 The method comprises the steps of carrying out a first treatment on the surface of the Arc of addendum EF and root of addendumThe central angles of the arcs BC are alpha, and the central angles of the first arc AB, the second arc CD, the third arc DE and the fourth arc FA are beta; the point F, the point P, the point O and the point C are collinear; the point A, the point P, the point Q and the point D are collinear; the section profile (202) of the right screw rotor (2) is identical to the section profile (201) of the left screw rotor (1).
In the working process, in synchronous homodromous double-rotation motion, the left screw rotor (1) and the right screw rotor (2) can be completely meshed, and the meshing relationship is as follows: the first arc AB, the tooth root arc BC, the second arc CD, the third arc DE, the tooth top arc EF and the fourth arc FA on the section molded line (201) of the left screw rotor (1) are respectively meshed with the third arc DE, the tooth top arc EF, the fourth arc FA, the first arc AB, the tooth root arc BC and the second arc CD on the section molded line (202) of the right screw rotor (2).
Geometric parameters of a section profile (201) of a fully smooth double screw extruder screw rotor, left screw rotor (1): r is R 2 、R 1 、R 3 、R 4 R, α and β satisfy the following relationship:
the arc equation of each component of the section profile (201) of the left screw rotor (1) of the screw rotor of the fully smooth double screw extruder is as follows:
(1) the equation for the first arc AB is:
(2) the equation for root arc BC is:
(3) the equation for the second arc CD is:
(4) the equation for the third arc DE is:
(5) the equation for the addendum arc EF is:
(6) the equation for the fourth arc FA is:
t-angle parameter.
The homodromous double-screw extruder is provided with a screw rotor of the full-smooth double-screw extruder.
The invention has the beneficial effects that:
(1) the section molded line of the screw rotor comprises 6 sections of circular arcs, so that the screw rotor generated by the spiral expansion of the section molded line of the screw rotor along the axial direction can be completely meshed, and the screw rotor has a good mixing effect;
(2) the composition curve of the section molded line of the double-screw rotor is simple, and the double-screw rotor only comprises an arc, so that the double-screw rotor is convenient to process and manufacture;
(3) the section molded line of the screw rotor has no non-smooth connection point, so that smooth connection between adjacent arc lines on the section molded line of the rotor is realized, the generated screw rotor has no edge, the abrasion of the rotor in engagement is reduced, the service life of the screw rotor is prolonged, and the stress characteristic of the screw rotor is improved;
(4) the rotor profile type of the homodromous double-screw extruder is enriched.
Drawings
Fig. 1 is a cross-sectional profile of the proposed screw rotor.
Fig. 2 is a meshing diagram of a cross-sectional profile of the proposed screw rotor.
Fig. 3 is a cross-sectional profile engagement process diagram of the proposed screw rotor.
Fig. 4 is a meshing diagram of the proposed screw rotor.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
As shown in fig. 1, a cross-sectional profile of the proposed screw rotor; the curve comprises 6 sections of curves, including 6 sections of circular arcs, and each adjacent curve is smooth in transition, and according to anticlockwise direction, the curve is: a first arc AB, a root arc BC, a second arc CD, a third arc DE, an addendum arc EF and a fourth arc FA; the circle center of the first arc AB is the point Q, and the radius is R 4 The method comprises the steps of carrying out a first treatment on the surface of the The center point of the root arc BC is the rotation center O point of the left screw rotor (1), and the radius is R 3 The method comprises the steps of carrying out a first treatment on the surface of the The center of the second arc CD is the point P, and the radius is R 4 The method comprises the steps of carrying out a first treatment on the surface of the The circle center of the third arc DE is a point Q, and the radius is r; the circle center of the tooth top arc EF is the rotation center O point of the left screw rotor (1), and the radius is R 1 The method comprises the steps of carrying out a first treatment on the surface of the The center of the fourth arc FA is the point P, and the radius is r; the pitch circle center of the left screw rotor (1) is the center of rotation O point, and the radius is R 2 The method comprises the steps of carrying out a first treatment on the surface of the The central angles of the addendum arc EF and the dedendum arc BC are alpha, and the central angles of the first arc AB, the second arc CD, the third arc DE and the fourth arc FA are beta; point P, point F, point O and point C are collinear; the point A, the point P, the point Q and the point D are collinear;
radius of pitch circle R 2 、R 1 、R 3 、R 4 R, α and β satisfy the following relationship:
geometric parameter R of a section profile (201) of a left screw rotor (1) 1 、R 3 After r is determined, other geometric parameters can be deduced, and a section molded line is determined; the section profile (202) of the right screw rotor (2) is identical to the section profile (201) of the left screw rotor (1).
The equation of the composition curve of the section profile (201) of the left screw rotor (1) is as follows:
(1) the equation for the first arc AB is:
(2) the equation for root arc BC is:
(3) the equation for the second arc CD is:
(4) the equation for the third arc DE is:
(5) the equation for the addendum arc EF is:
(6) the equation for the fourth arc FA is:
t-angle parameter.
As shown in fig. 2, a meshing diagram of the cross-sectional profile of the proposed screw rotor; in the working process, the meshing relationship between each section of curves on the section molded line (201) of the left screw rotor (1) and the section molded line (202) of the right screw rotor (2) is as follows: the first arc AB, the tooth root arc BC, the second arc CD, the third arc DE, the tooth top arc EF and the fourth arc FA of the section molded line (201) of the left screw rotor (1) are respectively correspondingly meshed with the third arc DE, the tooth top arc EF, the fourth arc FA, the first arc AB, the tooth root arc BC and the second arc CD on the section molded line (202) of the right screw rotor (2).
As shown in fig. 3, a cross-sectional profile engagement process diagram of the screw rotor is proposed; the meshing relationship of the section profile meshing of the left screw rotor (1) and the right screw rotor (2) at different phases is as follows: (a) The main shaft rotation angles corresponding to adjacent pictures in the pictures are staggered by 45 degrees; namely, the section profile (201) of the left screw rotor (1) rotates 45 degrees anticlockwise in the figures (a) to (b), and the section profile (202) of the right screw rotor (2) rotates 45 degrees anticlockwise; (b) The cross section profile (201) of the left screw rotor (1) rotates 45 degrees anticlockwise and the cross section profile (202) of the right screw rotor (2) rotates 45 degrees anticlockwise; and the like, thereby explaining that the section profiles of the left screw rotor (1) and the right screw rotor (2) at different phases meet the correct meshing relationship; therefore, the left screw rotor (1) and the right screw rotor (2) meet the correct meshing relationship during the working process.
As shown in fig. 4, a meshing diagram of the screw rotor is proposed; the left screw rotor (1) is obtained by axially and spirally expanding a section molded line (201) of the left screw rotor (1) along a spiral line, adjacent tooth surfaces of the left screw rotor (1) are in smooth transition, the left screw rotor (1) is identical to the right screw rotor (2), and complete and correct meshing can be realized.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.

Claims (2)

1. A fully smooth twin screw extruder screw rotor comprising: left screw rotor (1) and right screw rotor (2), characterized by: smooth connection can be realized between each section of adjacent curves on the section molded line (201) of the left screw rotor (1), and the left screw rotor (1) is completely smooth; the section molded line (201) of the left screw rotor (1) comprises 6 sections of circular arcs which are sequentially arranged in the anticlockwise direction: a first arc AB, a root arc BC, a second arc CD, a third arc DE, an addendum arc EF and a fourth arc FA; the circle center of the first arc AB is the point Q, and the radius is R 4 The method comprises the steps of carrying out a first treatment on the surface of the The center of the root arc BC is the rotation center O point of the left screw rotor (1), and the radius is R 3 The method comprises the steps of carrying out a first treatment on the surface of the The center of the second arc CD is the point P, and the radius is R 4 The method comprises the steps of carrying out a first treatment on the surface of the The circle center of the third arc DE is a point Q, and the radius is r; the circle center of the tooth top arc EF is the rotation center O point of the left screw rotor (1), and the radius is R 1 The method comprises the steps of carrying out a first treatment on the surface of the The center of the fourth arc FA is the point P, and the radius is r; the pitch circle center of the left screw rotor (1) is the center of rotation O point, and the radius is R 2 The method comprises the steps of carrying out a first treatment on the surface of the The central angles of the addendum arc EF and the dedendum arc BC are alpha, and the central angles of the first arc AB, the second arc CD, the third arc DE and the fourth arc FA are beta; the point F, the point P, the point O and the point C are collinear; the point A, the point P, the point Q and the point D are collinear; the section molded line (202) of the right screw rotor (2) is identical to the section molded line (201) of the left screw rotor (1);
in the working process, in synchronous homodromous double-rotation motion, the left screw rotor (1) and the right screw rotor (2) can be completely meshed, and the meshing relationship is as follows: a first arc AB, a tooth root arc BC, a second arc CD, a third arc DE, an tooth top arc EF and a fourth arc FA on a section molded line (201) of the left screw rotor (1) are respectively meshed with a third arc DE, an tooth top arc EF, a fourth arc FA, the first arc AB, the tooth root arc BC and the second arc CD on a section molded line (202) of the right screw rotor (2);
geometric parameters of a section profile (201) of the left screw rotor (1): r is R 2 、R 1 、R 3 、R 4 R, α and β satisfy the following relationship:
the arc equations of the components of the section molded line (201) of the left screw rotor (1) are as follows:
(1) the equation for the first arc AB is:
(2) the equation for root arc BC is:
(3) the equation for the second arc CD is:
(4) the equation for the third arc DE is:
(5) the equation for the addendum arc EF is:
(6) the equation for the fourth arc FA is:
t-angle parameter.
2. The utility model provides a homodromous twin-screw extruder which characterized in that: use of a fully smooth twin screw extruder screw rotor according to claim 1.
CN201710549383.1A 2017-07-07 2017-07-07 Full smooth double screw extruder screw rotor Active CN107139424B (en)

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Application Number Priority Date Filing Date Title
CN201710549383.1A CN107139424B (en) 2017-07-07 2017-07-07 Full smooth double screw extruder screw rotor

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CN107139424A CN107139424A (en) 2017-09-08
CN107139424B true CN107139424B (en) 2023-07-21

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108437401B (en) * 2018-05-28 2023-07-11 中国石油大学(华东) Full-smooth conical screw rotor of double-screw extruder

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EP1093905A2 (en) * 1999-10-21 2001-04-25 Degussa-Hüls Aktiengesellschaft Twin screw extruder with mixing screw elements
CN102001174A (en) * 2009-08-26 2011-04-06 宝理塑料株式会社 Screw kneading block and screw
CN102066065A (en) * 2008-06-20 2011-05-18 拜尔技术服务有限责任公司 Worm elements with an improved dispersing effect and low power input
CN102131627A (en) * 2008-06-20 2011-07-20 拜尔材料科学股份公司 Method for extruding plastic composition
CN103842150A (en) * 2011-09-28 2014-06-04 朗盛德国有限责任公司 Method for removing volatile components from polymer-containing media and degassing devices therefor
CN204471829U (en) * 2014-12-29 2015-07-15 广东轻工职业技术学院 With the self-cleaning in the same way double screw extruder of deflection plate
CN206983218U (en) * 2017-07-07 2018-02-09 中国石油大学(华东) A kind of complete smooth double-screw extruder screw rotor

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TWM358055U (en) * 2008-12-10 2009-06-01 Shuo-Jie Zhang Reversing twin screw extruder

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EP1093905A2 (en) * 1999-10-21 2001-04-25 Degussa-Hüls Aktiengesellschaft Twin screw extruder with mixing screw elements
CN102066065A (en) * 2008-06-20 2011-05-18 拜尔技术服务有限责任公司 Worm elements with an improved dispersing effect and low power input
CN102131627A (en) * 2008-06-20 2011-07-20 拜尔材料科学股份公司 Method for extruding plastic composition
CN102001174A (en) * 2009-08-26 2011-04-06 宝理塑料株式会社 Screw kneading block and screw
CN103842150A (en) * 2011-09-28 2014-06-04 朗盛德国有限责任公司 Method for removing volatile components from polymer-containing media and degassing devices therefor
CN204471829U (en) * 2014-12-29 2015-07-15 广东轻工职业技术学院 With the self-cleaning in the same way double screw extruder of deflection plate
CN206983218U (en) * 2017-07-07 2018-02-09 中国石油大学(华东) A kind of complete smooth double-screw extruder screw rotor

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