CN108437401B - Full-smooth conical screw rotor of double-screw extruder - Google Patents
Full-smooth conical screw rotor of double-screw extruder Download PDFInfo
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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
- B29C48/67—Screws having incorporated mixing devices not provided for in groups B29C48/52 - B29C48/66
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- 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
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- 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
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Abstract
Description
技术领域technical field
本发明涉及同向双螺杆挤出机,特别涉及适用于同向双螺杆挤出机的一种全光滑锥形螺杆转子。The invention relates to a co-rotating twin-screw extruder, in particular to a fully smooth conical screw rotor suitable for the co-rotating twin-screw extruder.
背景技术Background technique
双螺杆挤出机是加工机械中的一种重要设备,因其具有良好的加料性能、混炼塑化性能及排气性能等,目前已经广泛应用于挤出制品的成型加工;同向双螺杆挤出机通过两个螺杆转子的同步同向双回转运动,完成聚合物的输送、塑化、混合与混炼;双螺杆挤出机的核心部件为一对相互啮合的螺杆转子,螺杆转子的形式及啮合精度直接影响挤出产品的质量。Twin-screw extruder is an important equipment in processing machinery. Because of its good feeding performance, mixing and plasticizing performance and exhaust performance, it has been widely used in the molding and processing of extruded products; co-rotating twin-screw extruders The extruder completes the conveying, plasticizing, mixing and kneading of the polymer through the synchronous double-rotation motion of the two screw rotors; the core component of the twin-screw extruder is a pair of intermeshing screw rotors. Form and meshing accuracy directly affect the quality of extruded products.
专利CN107139424公开的一种全光滑的双螺杆挤出机螺杆转子,螺杆转子的截面型线由6段曲线组成,采用4段圆弧连接齿顶圆弧及齿根圆弧,在光滑连接处对加工精度要求较高;两个螺杆转子在任意轴向位置处的截面型线均相同,以此螺杆转子为核心部件的平行双螺杆挤出机由于受到两个螺杆中心距尺寸的限制,输出扭距小、抗负荷能力差。Patent CN107139424 discloses a fully smooth twin-screw extruder screw rotor. The cross-sectional profile of the screw rotor is composed of 6 sections of curves, and 4 sections of arcs are used to connect the addendum arc and the dedendum arc. The processing accuracy is high; the cross-sectional profiles of the two screw rotors are the same at any axial position, and the parallel twin-screw extruder with the screw rotor as the core component is limited by the center distance between the two screws. Small distance and poor load resistance.
发明内容Contents of the invention
针对以上问题,同时为了丰富双螺杆挤出机螺杆转子的种类,本发明提出了一种双螺杆挤出机的全光滑锥形螺杆转子:包括左螺杆转子(1)和右螺杆转子(2),螺杆转子呈锥形;螺杆转子的螺距P保持不变;在任意轴向位置处螺杆转子的截面型线的组成曲线类型和数目都相同;通过保持螺杆转子的齿顶圆弧的圆心角α不变,使得螺杆转子的齿顶厚度δ1和齿根厚度δ2始终不变且相等;左螺杆转子(1)和右螺杆转子(2)完全相同,且两螺杆转子的轴线平行;螺杆转子呈锥形,使得螺杆转子具有良好的挤出性能,两个螺杆转子又作同向转动,啮合处存在相切作用,有效提高了物料混合性及分散性,使得双螺杆挤出机具有分散性好、产量高及节能等优势;同时因为两个螺杆转子的轴线平行,对安装精度的要求大大降低;在螺杆转子任意轴向位置的截面型线上,采用一段偏心圆渐开线及一段偏心圆渐开线的包络线光滑连接齿顶圆弧和齿根圆弧,截面型线的组成曲线简单,便于加工制造;螺杆转子所采用的截面型线是全光滑的并且能够实现完全正确的啮合,减少了螺杆转子的摩擦磨损,提高了螺杆转子的使用寿命;所提出的一种双螺杆挤出机的全光滑锥形螺杆转子对于提高双螺杆挤出机的性能具有重要的意义。In view of the above problems, and in order to enrich the types of screw rotors of twin-screw extruders, the present invention proposes a fully smooth conical screw rotor of twin-screw extruders: including left screw rotor (1) and right screw rotor (2) , the screw rotor is conical; the pitch P of the screw rotor remains unchanged; the composition curve type and number of the cross-sectional profile lines of the screw rotor at any axial position are the same; by keeping the central angle α of the addendum arc of the screw rotor constant, so that the screw rotor’s addendum thickness δ 1 and dedendum thickness δ 2 are always constant and equal; the left screw rotor (1) and the right screw rotor (2) are exactly the same, and the axes of the two screw rotors are parallel; the screw rotor The conical shape makes the screw rotor have good extrusion performance, and the two screw rotors rotate in the same direction, and there is a tangential effect at the meshing point, which effectively improves the mixing and dispersibility of the material, making the twin-screw extruder have dispersibility Good quality, high output and energy saving; at the same time, because the axes of the two screw rotors are parallel, the requirements for installation accuracy are greatly reduced; on the cross-sectional profile line at any axial position of the screw rotor, a section of eccentric circle involute and a section of eccentric The envelope curve of the circular involute smoothly connects the addendum arc and the dedendum arc, and the composition curve of the section profile is simple, which is convenient for processing and manufacturing; the section profile of the screw rotor is completely smooth and can realize completely correct The meshing reduces the friction and wear of the screw rotor and improves the service life of the screw rotor; the proposed fully smooth conical screw rotor of a twin-screw extruder is of great significance for improving the performance of the twin-screw extruder.
为了实现上述目的,本发明采用如下技术方案:In order to achieve the above object, the present invention adopts the following technical solutions:
本发明提出的一种双螺杆挤出机的全光滑锥形螺杆转子,包括左螺杆转子(1)和右螺杆转子(2),其特征是:左螺杆转子(1)呈锥形,左螺杆转子(1)的螺距P保持不变;在任意轴向位置处左螺杆转子(1)的左截面型线(101)的组成曲线类型和数目都相同;从左螺杆转子(1)的吸入端(Ⅰ-Ⅰ)到排出端(Ⅸ-Ⅸ),左螺杆转子(1)的左截面型线(101)的齿顶圆弧半径R1逐渐减小,齿根圆弧半径R3逐渐增大,节圆半径R2保持不变;左螺杆转子(1)的齿顶厚度δ1和齿根厚度δ2始终不变且相等,即δ1=δ2;左螺杆转子(1)和右螺杆转子(2)完全相同,且两螺杆转子的轴线平行;The invention proposes a fully smooth conical screw rotor for a twin-screw extruder, comprising a left screw rotor (1) and a right screw rotor (2), characterized in that: the left screw rotor (1) is conical, and the left screw rotor The pitch P of the rotor (1) remains constant; at any axial position, the composition curve type and number of the left section profile line (101) of the left screw rotor (1) are the same; from the suction end of the left screw rotor (1) From (Ⅰ-Ⅰ) to the discharge end (Ⅸ-Ⅸ), the addendum arc radius R 1 of the left cross-sectional profile (101) of the left screw rotor (1) gradually decreases, and the dedendum arc radius R 3 gradually increases , the pitch circle radius R 2 remains unchanged; the addendum thickness δ 1 and the dedendum thickness δ 2 of the left screw rotor (1) are always constant and equal, that is, δ 1 = δ 2 ; the left screw rotor (1) and the right screw The rotors (2) are identical, and the axes of the two screw rotors are parallel;
左螺杆转子(1)的左截面型线(101)由4段曲线组成:左偏心圆渐开线AB、左齿根圆弧BC、左偏心圆渐开线的共轭曲线CD和左齿顶圆弧DA,相邻组成曲线之间完全光滑连接;右螺杆转子(2)的右截面型线(201)由4段曲线组成:右偏心圆渐开线ab、右齿根圆弧bc、右偏心圆渐开线的共轭曲线cd和右齿顶圆弧da;在同步同向双回转运动中,左螺杆转子(1)和右螺杆转子(2)能够实现完全正确的啮合;左螺杆转子(1)的左截面型线(101)与右螺杆转子(2)的右截面型线(201)能够实现正确的啮合;左螺杆转子(1)的左截面型线(101)上的左偏心圆渐开线AB、左齿根圆弧BC、左偏心圆渐开线的共轭曲线CD和左齿顶圆弧DA,分别与右螺杆转子(2)的右截面型线(201)上的右偏心圆渐开线的共轭曲线cd、右齿顶圆弧da、右偏心圆渐开线ab和右齿根圆弧bc能够实现正确的啮合。The left section profile (101) of the left screw rotor (1) is composed of 4 curves: the left eccentric involute AB, the left dedendum arc BC, the conjugate curve CD of the left eccentric involute and the left addendum The arc DA is completely smooth connection between the adjacent composition curves; the right section profile (201) of the right screw rotor (2) is composed of 4 sections of curves: right eccentric circle involute ab, right dedendum arc bc, right The conjugate curve cd of the involute of the eccentric circle and the arc da of the right addendum; in the synchronous double-rotation motion in the same direction, the left screw rotor (1) and the right screw rotor (2) can achieve completely correct meshing; the left screw rotor The left sectional profile (101) of (1) and the right sectional profile (201) of the right screw rotor (2) can achieve correct meshing; the left eccentricity on the left sectional profile (101) of the left screw rotor (1) Circular involute AB, left dedendum arc BC, conjugate curve CD of left eccentric circle involute and left addendum arc DA are respectively connected with the right section profile line (201) of the right screw rotor (2) The conjugate curve cd of the involute of the right eccentric circle, the arc da of the right addendum, the involute ab of the right eccentric circle and the arc bc of the right dedendum can realize the correct meshing.
一种双螺杆挤出机的全光滑锥形螺杆转子,左螺杆转子(1)的左截面型线(101)上的6个几何参数:齿顶圆弧半径R1、齿根圆弧半径R3、偏心圆渐开线的基圆半径Rb、偏心圆渐开线的中心角γ、圆弧的圆心角α和偏心圆渐开线的发生角β之间满足以下方程:A fully smooth conical screw rotor of a twin-screw extruder, six geometric parameters on the left section profile (101) of the left screw rotor (1): addendum arc radius R 1 , dedendum arc radius R 3. The radius R b of the base circle of the involute of the eccentric circle, the central angle γ of the involute of the eccentric circle, the central angle α of the arc and the occurrence angle β of the involute of the eccentric circle satisfy the following equation:
式中:R2为节圆半径。In the formula: R 2 is the pitch circle radius.
一种双螺杆挤出机的全光滑锥形螺杆转子,在任意轴向位置处,左螺杆转子(1)的左截面型线(101)上的齿顶圆弧半径R1和齿根圆弧半径R3随截面型线距吸入端(Ⅰ-Ⅰ)的轴向距离z的变化而变化;A completely smooth conical screw rotor of a twin-screw extruder, at any axial position, the radius of the addendum arc R 1 and the arc of the dedendum on the left section profile (101) of the left screw rotor (1) The radius R 3 changes with the change of the axial distance z from the section line to the suction end (I-I);
齿顶圆弧半径R1随轴向距离z的变化关系为:The relationship between the radius R 1 of the addendum arc and the axial distance z is as follows:
齿根圆弧半径R3随轴向距离z的变化关系为:The relationship between the root arc radius R 3 and the axial distance z is as follows:
式中:Rs1、Rd1分别为吸入端(Ⅰ-Ⅰ)和排出端(Ⅸ-Ⅸ)处的齿顶圆弧半径;Rs3、Rd3分别为吸入端(Ⅰ-Ⅰ)和排出端(Ⅸ-Ⅸ)处的齿根圆弧半径;zm为排出端(Ⅸ-Ⅸ)到吸入端(Ⅰ-Ⅰ)的轴向距离。In the formula: R s1 and R d1 are the radius of the addendum arc at the suction end (I-I) and the discharge end (IX-IX) respectively; R s3 and R d3 are the suction end (I-I) and the discharge end respectively (Ⅸ-Ⅸ) the radius of the dedendum arc; z m is the axial distance from the discharge end (Ⅸ-Ⅸ) to the suction end (Ⅰ-Ⅰ).
一种双螺杆挤出机的全光滑锥形螺杆转子,左螺杆转子(1)的左截面型线(101)上的各段曲线的方程如下:A fully smooth conical screw rotor of a twin-screw extruder, the equations of the curves of each segment on the left section profile line (101) of the left screw rotor (1) are as follows:
①左偏心圆渐开线AB:①Left eccentric circle involute AB:
②左齿根圆弧BC:②Left dedendum arc BC:
③左齿顶圆弧DA:③Left addendum arc DA:
④左偏心圆渐开线AB的共轭曲线CD:④The conjugate curve CD of the involute AB of the left eccentric circle:
取 Pick
将上述方程确定的初始曲线,绕回转中心点O顺时针旋转角度,得到左偏心圆渐开线AB的包络线CD;Rotate the initial curve determined by the above equation clockwise around the rotation center point O Angle, get the envelope CD of the involute AB of the left eccentric circle;
令得到:make get:
将解得的代入原始方程即得左偏心圆渐开线AB的共轭曲线CD的方程。will be solved Substituting into the original equation, the equation of the conjugate curve CD of the left eccentric involute AB is obtained.
本发明的有益效果为:The beneficial effects of the present invention are:
①所提出的一种双螺杆挤出机的全光滑锥形螺杆转子,从螺杆转子的吸入端(Ⅰ-Ⅰ)到排出端(Ⅸ-Ⅸ),螺杆转子的截面型线沿螺旋线展开的同时,螺杆转子截面型线的齿顶圆弧半径R1逐渐减小,齿根圆弧半径R3逐渐增大,能充分增大吸入端的工作腔容积,减小排出端的工作腔容积,使得螺杆转子具有良好的挤出功能,提高了双螺杆挤出机的挤出效率;①A fully smooth conical screw rotor of a twin-screw extruder is proposed. From the suction end (I-I) of the screw rotor to the discharge end (IX-IX), the cross-sectional profile of the screw rotor develops along the helical line At the same time, the addendum arc radius R 1 of the cross-sectional profile of the screw rotor gradually decreases, and the dedendum arc radius R 3 gradually increases, which can fully increase the volume of the working chamber at the suction end and reduce the volume of the working chamber at the discharge end, making the screw The rotor has a good extrusion function, which improves the extrusion efficiency of the twin-screw extruder;
②所提出的两个螺杆转子的轴线平行,大大降低了对安装精度的要求;② The axes of the proposed two screw rotors are parallel, which greatly reduces the requirements for installation accuracy;
③所提出的螺杆转子的截面型线组成曲线简单,便于加工制造;③ The cross-sectional profile curve of the proposed screw rotor is simple and easy to process and manufacture;
④所提出的螺杆转子的截面型线,相邻组成曲线之间完全光滑连接,由螺杆转子的截面型线沿螺旋线展开生成的螺杆转子能够实现完全正确的啮合,改善了螺杆转子的受力情况,减少了螺杆转子的摩擦磨损,提高了螺杆转子的使用寿命;④The cross-sectional profile of the proposed screw rotor is completely smooth connected between adjacent component curves, and the screw rotor generated by the cross-sectional profile of the screw rotor along the helical line can achieve completely correct meshing, which improves the force of the screw rotor The situation reduces the friction and wear of the screw rotor and improves the service life of the screw rotor;
⑤丰富了双螺杆挤出机的螺杆转子类型及螺杆转子的截面型线类型。⑤Enriched the screw rotor type of twin-screw extruder and the section profile type of screw rotor.
附图说明Description of drawings
图1为双螺杆挤出机的全光滑锥形螺杆转子的截面型线图。Figure 1 is a cross-sectional line diagram of a fully smooth conical screw rotor of a twin-screw extruder.
图2为两个螺杆转子的截面型线的啮合图。Fig. 2 is an meshing diagram of cross-sectional profiles of two screw rotors.
图3为双螺杆挤出机的全光滑锥形螺杆转子图。Figure 3 is a diagram of a fully smooth conical screw rotor of a twin-screw extruder.
图4为工作时两个全光滑的锥形螺杆转子的啮合图。Figure 4 is the meshing diagram of two fully smooth conical screw rotors in operation.
图5为两个螺杆转子在(Ⅰ-Ⅰ)位置处的截面型线的瞬时啮合图;Fig. 5 is an instantaneous meshing diagram of the section profiles of two screw rotors at (I-I) position;
图6为两个螺杆转子在(Ⅴ-Ⅴ)位置处的截面型线的瞬时啮合图;Fig. 6 is the instant meshing diagram of the section profiles of two screw rotors at the (V-V) position;
图7为两个螺杆转子在(Ⅸ-Ⅸ)位置处的截面型线的瞬时啮合图;Fig. 7 is an instantaneous meshing diagram of the cross-sectional profiles of the two screw rotors at the (IX-IX) position;
图中:R1和R3分别为螺杆转子截面型线上的齿顶圆弧半径和齿根圆弧半径,R2为节圆半径,且2R2=R1+R3;α为齿顶圆弧的圆心角,齿根圆弧的圆心角与齿顶圆弧的圆心角大小相等;β为偏心圆渐开线的发生角;Rb为偏心圆渐开线的基圆半径;γ为偏心圆渐开线的中心角;δ1为螺杆转子的齿顶厚度;δ2为螺杆转子的齿根厚度;P为螺杆转子的螺距;1为左螺杆转子;2为右螺杆转子;101为左螺杆转子(1)的左截面型线;201为右螺杆转子(2)的右截面型线;点O、o分别为两个螺杆转子截面型线的回转中心点,所在的轴线分别为两个螺杆转子的回转中心线;点N、n分别为两个螺杆转子截面型线上的偏心圆渐开线的基圆的圆心。In the figure: R 1 and R 3 are respectively the addendum arc radius and the dedendum arc radius on the section profile of the screw rotor, R 2 is the pitch circle radius, and 2R 2 = R 1 + R 3 ; α is the addendum radius The central angle of the arc, the central angle of the dedendum arc is equal to the central angle of the addendum arc; β is the occurrence angle of the involute of the eccentric circle; R b is the radius of the base circle of the involute of the eccentric circle; γ is The central angle of the involute of the eccentric circle; δ 1 is the thickness of the addendum of the screw rotor; δ 2 is the thickness of the dedendum of the screw rotor; P is the pitch of the screw rotor; 1 is the left screw rotor; 2 is the right screw rotor; 101 is The left section profile line of the left screw rotor (1); 201 is the right section profile line of the right screw rotor (2); points O and o are the center of rotation of the two screw rotor section profiles respectively, and the axes are respectively two The centerline of rotation of the two screw rotors; points N and n are the centers of the base circles of the eccentric involutes on the cross-sectional profile of the two screw rotors.
具体实施方式Detailed ways
下面结合附图与实例对本发明作进一步说明。The present invention will be further described below in conjunction with accompanying drawings and examples.
如图1所示,为所提出的双螺杆挤出机的全光滑锥形螺杆转子的截面型线图;左螺杆转子(1)的左截面型线(101)由4段曲线组成,包括两段圆弧及两段偏心圆渐开线,按逆时针依次为:左偏心圆渐开线AB、左齿根圆弧BC、左偏心圆渐开线的共轭曲线CD和左齿顶圆弧DA,相邻组成曲线之间完全光滑连接;左螺杆转子(1)的左截面型线(101)与右螺杆转子(2)的右截面型线(201)的形状完全相同。As shown in Figure 1, it is the sectional profile diagram of the fully smooth conical screw rotor of the proposed twin-screw extruder; the left sectional profile (101) of the left screw rotor (1) is made up of 4 sections of curves, including two One-section arc and two sections of eccentric involute, counterclockwise as follows: left eccentric involute AB, left dedendum arc BC, conjugate curve CD of left eccentric involute and left addendum arc DA, complete smooth connection between adjacent composition curves; the shape of the left section profile (101) of the left screw rotor (1) is exactly the same as that of the right section profile (201) of the right screw rotor (2).
如图2所示,为两个螺杆转子的截面型线的啮合图;左螺杆转子(1)的左截面型线(101)与右螺杆转子(2)的右截面型线(201)能够实现正确的啮合;左螺杆转子(1)的左截面型线(101)上的左偏心圆渐开线AB、左齿根圆弧BC、左偏心圆渐开线的共轭曲线CD和左齿顶圆弧DA,分别与右螺杆转子(2)的右截面型线(201)上的右偏心圆渐开线的共轭曲线cd、右齿顶圆弧da、右偏心圆渐开线ab和右齿根圆弧bc能够实现正确的啮合。As shown in Figure 2, it is the meshing diagram of the section profiles of two screw rotors; the left section profile (101) of the left screw rotor (1) and the right section profile (201) of the right screw rotor (2) can realize Correct meshing; left eccentric involute AB, left dedendum arc BC, conjugate curve CD of left eccentric involute and left addendum on the left section profile (101) of the left screw rotor (1) Circular arc DA, respectively with the conjugate curve cd of the right eccentric circular involute on the right cross-sectional profile line (201) of the right screw rotor (2), the right addendum arc da, the right eccentric circular involute ab and the right The dedendum arc bc enables correct meshing.
如图3所示,为双螺杆挤出机的全光滑锥形螺杆转子图;Ⅰ-Ⅰ和Ⅸ-Ⅸ分别为两个螺杆转子吸入端和排出端对应的轴向位置;左螺杆转子(1)由左截面型线(101)从吸入端(Ⅰ-Ⅰ)向排出端(Ⅸ-Ⅸ)沿螺旋线展开,在螺旋展开的同时,左螺杆转子(1)的左截面型线(101)上的齿顶圆弧半径R1逐渐减小,齿根圆弧半径R3逐渐增大,使得螺杆转子整体呈锥形;左螺杆转子(1)和右螺杆转子(2)完全相同,且两螺杆转子的轴线平行;As shown in Figure 3, it is a diagram of a fully smooth conical screw rotor of a twin-screw extruder; I-I and IX-IX are the axial positions corresponding to the suction end and discharge end of the two screw rotors respectively; the left screw rotor (1 ) from the left section profile (101) along the helical line from the suction end (I-I) to the discharge end (IX-IX). The addendum arc radius R 1 gradually decreases, and the dedendum arc radius R 3 gradually increases, making the screw rotor overall conical; the left screw rotor (1) and the right screw rotor (2) are identical, and the two The axes of the screw rotors are parallel;
如图4所示,为工作时两个全光滑的锥形螺杆转子的啮合图;螺杆转子的螺距P保持不变;螺杆转子的齿顶厚度δ1和齿根厚度δ2沿轴向始终不变且相等;在截面型线沿螺旋线展开生成螺杆转子的过程中,截面型线距吸入端(Ⅰ-Ⅰ)的轴向距离z取0,P/2,P,3P/2,2P,5P/2,3P,7P/2,4P时,对应的轴向位置分别用Ⅰ-Ⅰ、Ⅱ-Ⅱ、Ⅲ-Ⅲ、Ⅳ-Ⅳ、Ⅴ-Ⅴ、Ⅵ-Ⅵ、Ⅶ-Ⅶ、Ⅷ-Ⅷ、Ⅸ-Ⅸ表示。As shown in Figure 4, it is the meshing diagram of two fully smooth conical screw rotors during operation; the pitch P of the screw rotor remains unchanged; the thickness of the addendum δ 1 and the thickness of the dedendum δ 2 of the screw rotor are always constant along the axial direction change and equal; in the process of developing the section profile along the helical line to generate the screw rotor, the axial distance z between the section profile and the suction end (I-I) is taken as 0, P/2, P, 3P/2, 2P, For 5P/2, 3P, 7P/2, 4P, the corresponding axial positions are respectively Ⅰ-Ⅰ, Ⅱ-Ⅱ, Ⅲ-Ⅲ, Ⅳ-Ⅳ, Ⅴ-Ⅴ, Ⅵ-Ⅵ, Ⅶ-Ⅶ, Ⅷ- VIII, IX-IX said.
如图5所示,为两个螺杆转子在(Ⅰ-Ⅰ)位置处的截面型线的瞬时啮合图;As shown in Figure 5, it is an instantaneous meshing diagram of the cross-sectional profiles of the two screw rotors at the (I-I) position;
如图6所示,为两个螺杆转子在(Ⅴ-Ⅴ)位置处的截面型线的瞬时啮合图;As shown in Figure 6, it is an instantaneous meshing diagram of the cross-sectional profiles of the two screw rotors at the (V-V) position;
如图7所示,为两个螺杆转子在(Ⅸ-Ⅸ)位置处的截面型线的瞬时啮合图;As shown in Figure 7, it is an instantaneous meshing diagram of the cross-sectional profiles of the two screw rotors at the (Ⅸ-Ⅸ) position;
由图5、图6及图7可知在任意轴向位置处两个螺杆转子的截面型线是完全啮合的,因此能说明,在同步同向双回转运动中,两螺杆转子能够实现完全正确的啮合;同时可见从螺杆转子的吸入端(Ⅰ-Ⅰ)到排出端(Ⅸ-Ⅸ),螺杆转子的截面型线的齿顶圆弧半径R1逐渐减小,齿根圆弧半径R3逐渐增大,节圆半径R2保持不变;由截面型线沿螺旋线展开生成的两个螺杆转子,由吸入端(Ⅰ-Ⅰ)到排出端(Ⅸ-Ⅸ),工作腔容积逐渐减小,使得螺杆转子具有良好的挤出功能,提高了双螺杆挤出机的挤出效率。From Fig. 5, Fig. 6 and Fig. 7, it can be seen that the cross-sectional profiles of the two screw rotors are completely meshed at any axial position, so it can be explained that in the synchronous double-rotation motion in the same direction, the two screw rotors can achieve completely correct At the same time, it can be seen that from the suction end (I-I) to the discharge end (IX-IX) of the screw rotor, the addendum arc radius R 1 of the cross-sectional profile line of the screw rotor gradually decreases, and the dedendum arc radius R 3 gradually decreases. The pitch circle radius R2 remains unchanged; the volume of the working chamber decreases gradually from the suction end (Ⅰ-Ⅰ) to the discharge end (Ⅸ-Ⅸ) of the two screw rotors generated by the section profile along the helical line , so that the screw rotor has a good extrusion function and improves the extrusion efficiency of the twin-screw extruder.
上述虽然结合附图对本发明的具体实施方式进行了描述,但并非对本发明保护范围的限制,所属领域技术人员应该明白,在本发明的技术方案的基础上,本领域技术人员不需要付出创造性劳动即可做出的各种修改或变形仍在本发明的保护范围以内。Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.
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