CN101605641A - 用于基于挤压的沉积系统的粘性泵 - Google Patents
用于基于挤压的沉积系统的粘性泵 Download PDFInfo
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- CN101605641A CN101605641A CNA2008800048200A CN200880004820A CN101605641A CN 101605641 A CN101605641 A CN 101605641A CN A2008800048200 A CNA2008800048200 A CN A2008800048200A CN 200880004820 A CN200880004820 A CN 200880004820A CN 101605641 A CN101605641 A CN 101605641A
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- Prior art keywords
- liquefier
- staving
- driven roller
- filamentous
- impeller
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/83—Heating or cooling the cylinders
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Abstract
本发明公开一种泵系统(10),包括:输送组件(22),其被构造成在第一驱动电动机(16)操作动力下供给固体材料;和螺杆泵(24),所述螺杆泵包括:至少部分地限定螺杆泵(10)的桶体(106)的外壳(84)、在桶体(106)的第一端处固定到外壳(84)的挤压末端(82)、固定到外壳(84)并且与桶体(106)相交的液化器(85、342)、和至少部分地延伸通过桶体(106)的叶轮(94)。液化器(85、342)被构造成接收从输送组件(22)供给的固体材料,以至少部分地熔化接收的固体材料,并且将至少部分熔融的材料引导到桶体(106),并且叶轮(94)被构造成在第二驱动电动机(18)的操作动力下将引导到桶体(106)的至少部分熔融的材料朝向挤压末端(82)驱动。
Description
技术领域
本发明涉及使用基于挤压的分层制造系统构造三维(3D)物体。具体地,本发明涉及与用于构造3D物体的基于挤压的分层制造系统一起使用的粘性泵。
背景技术
基于挤压的分层制造系统(例如,由位于美国明尼苏达州Eden Prairie的Stratasys公司开发的熔融沉积造型系统)用于由计算机辅助系统(CAD)模型通过挤压可流动构建材料以逐层方式构建3D物体。构建材料被挤压通过挤压头所带的喷嘴,并且沉积为x-y平面内基底上的连续路径。被挤压的构建材料与之前沉积的构建材料相熔合,在温度降低后固化。然后挤压头相对于基底的位置沿z轴线(与x-y平面垂直)增加,然后重复这个过程以形成与CAD模型相似的3D物体。
挤压头相对于基底的运动在计算机控制下根据表示3D物体的构建数据而执行。构建数据通过初始将3D物体的CAD模型切片成多个水平薄层而获得。然后,对于每个薄层,主机生成用于构建材料沉积路径的构建路径以形成3D物体。
在通过沉积构建材料层构造3D物体中,支撑层或结构典型地构建在悬垂部下方或在结构下面的物体的腔中,支撑层或结构不是通过构建材料自身支撑。支撑结构可以利用与构建材料被沉积的相同沉积技术构建。主机产生另外的几何形状,所述几何形状作为用于正在形成的3D物体的悬垂或自由间隔部分的支撑结构。支撑材料然后依照在构建过程期间产生的几何形状从第二挤压端沉积。在构造期间,支撑材料粘附构建材料,并且当构建过程完成时可从完成的3D物体移走。
发明内容
本发明涉及适合用在基于挤压的沉积系统中的泵系统。所述泵系统包括:输送组件,其与第一驱动电动机可操作地接合;和螺杆泵,所述螺杆泵包括:至少部分地限定螺杆泵的桶体的外壳、在桶体的第一端处固定到外壳的挤压末端、固定到外壳并且与桶体相交的液化器、和至少部分地延伸通过桶体的叶轮。输送组件被构造成在第一驱动电动机的操作动力下供给固体材料。液化器被构造成接收从输送组件供给的固体材料,以至少部分地熔化所接收的固体材料,并且将至少部分熔融的材料引导到桶体。叶轮被构造成在第二驱动电动机的操作动力下将引导到桶体的至少部分熔融的材料朝向挤压末端驱动。
附图说明
图1A是本发明两级泵系统的侧视图;
图1B是本发明的两级泵系统的透视图;
图2A和2B是两级泵系统的丝状体状输送组件的底视图;
图3是两级泵系统的螺杆泵的侧视图;
图4是在图3中截得的部分4-4的剖视图,其中显示螺杆泵的内部区域;
图5是螺杆泵顶部分的放大剖视图;
图6是在图3中截得的部分6-6的剖视图,其中显示螺杆泵的液化器腔;
图7A是螺杆泵的叶轮的侧视图;
图7B是螺杆泵的叶轮的透视图;
图8是与外部加热系统一起使用的螺杆泵的侧视图;
图9是在图8中截得的部分9-9的剖视图;
图10是与可选的加热系统和冷却系统一起使用的螺杆泵的侧视图;
图11是在图10中截得的部分11-11的剖视图;
图12是两级泵系统的可选螺杆泵的透视图;以及
图13是包括可选的两级泵系统的挤压装置的俯视图。
具体实施方式
图1A和1B分别是两级泵系统10的侧视图和透视图,两级泵系统10是在基于挤压的分层制造系统(例如,由位于美国明尼苏达州Eden Prairie的Stratasys公司开发的熔融沉积造型系统)中作为挤压头使用的合适的挤压系统。如图1A所示,泵系统10包括框架12、入口部分14、驱动电动机16和18、引导管20、丝状体输送组件22和螺杆泵24。
框架12是泵系统10的支撑结构,并且入口部分14、驱动电动机16和18、引导管20、丝状体输送组件22和螺杆泵24中的每个都直接或间接地连接到框架12。入口部分14是提供用于接收来自丝状体源(未显示)的构建或支撑材料(未显示)的丝状体的便利入口端口的结构。引导管20是延伸进入口部分14的管,用于将来自丝状体源的丝状体引导到丝状体输送组件22。
驱动电动机16和丝状体输送组件22限定泵系统10的第一级。驱动电动机16是延伸通过框架12的第一电动机,并被构造成操作丝状体输送组件22。丝状体输送组件22设置在框架12下方,并且包括由驱动电动机16操作的压带轮和齿轮系统。此布置允许丝状体输送组件22将来自引导管20的丝状体供给螺杆泵24。
如图1B所示,泵系统10还包括轴向地连接到驱动电动机18的电动机滑轮26。驱动电动机18是固定在框架12上方的第二电动机,并且所述第二电动机被构造成通过电动机滑轮26操作螺杆泵24。因此,驱动电动机18、螺杆泵24和电动机滑轮26限定泵系统10的第二级。螺杆泵24延伸通过框架12,并且包括皮带轮28,皮带轮28通过皮带(未显示)可操作地连接到电动机滑轮26。这允许电动机滑轮26(通过驱动电动机18)的旋转相应地旋转皮带轮28(通过皮带)。如下所述,皮带轮28的旋转相应地旋转螺杆泵24的叶轮(在图1A或1B中未显示)。
在操作期间,驱动电动机16使丝状体输送组件22将构建或支撑材料的丝状体供给螺杆泵24,在螺杆泵24中,丝状体被熔化以提供可流动状态下的构建材料。然后,驱动电动机18使螺杆泵24的叶轮(通过电动机滑轮26、皮带轮28和同步皮带)旋转,以挤压可流动材料,从而以逐层的方式形成3D物体或支撑结构。
如下所述,泵系统10以高于通常利用标准液化器泵获得的流量的流量挤压可流动材料。另外,泵系统10提供更恒定的响应时间。响应时间是泵中可流动材料的体积的函数。在标准液化器泵中,可流动材料的体积通常与流量成比例。例如,在低流量下,液化器中的丝状体具有熔化时间,使得液化器的大部分体积被熔化,并且响应时间缓慢。然而,在高流量处,被熔化的体积减小,从而增加响应时间。因为大多数3D物体具有以各种挤压流量构建的各种几何形状,所以标准液化器泵的响应时间也变化。相反,螺杆泵24中的可流动材料的体积保持较低。因而,泵系统10的响应时间快并且可以基本上保持恒定。
图2A和2B是驱动电动机16和丝状体输送组件22的底部透视图,其中,丝状体输送组件22是用于将构建或支撑材料(未显示)的丝状体供给螺杆泵24(如图1A和1B所示)的适当的材料推进机构。丝状体输送组件22包括支撑板30、供给块32、丝状体管34、出口块36、偏置块38和齿轮系统40,其中支撑板30由框架12(显示在图1A和1B中)保持。
供给块32固定到支撑板30,并且包括延伸通过供给块32的通道42。供给块32是丝状体输送组件22的、连接到引导管20(显示在图1A和1B中)的部分,在所述供给块处,构建或支撑材料的丝状体从引导管20供给到通道42。丝状体管34从通道42的与引导管20相对的端部延伸,并且提供用于将丝状体引向出口块36的通路。如下所述,出口块36固定到支撑板30,并且包括用于将丝状体引向螺杆泵24的出口通道44(显示在图2B中)。偏置块38也固定到支撑板30,并且包括槽46和48以及销50,其中销50延伸通过槽48。
齿轮系统40包括驱动辊52和54、驱动齿轮56、空转齿轮空转58、60、62、64和66、支撑臂68和扭簧70。驱动辊52和54是夹紧丝状体并从丝状体管34将所述丝状体拉向出口块36的可旋转辊。驱动齿轮56和空转齿轮58、60、62、64和66一系列啮合齿轮,其中空转齿轮58、60、62和64轴向地连接到支撑板30,从而允许空转齿轮58、60、62和64旋转。如图所示,驱动辊52轴向地连接到空转齿轮58,并且驱动辊54轴向地连接到空转齿轮66。此外,驱动齿轮56通过支撑板30轴向地连接到驱动电动机16。此布置允许驱动电动机16在操作期间旋转驱动齿轮56,驱动齿轮56相应地旋转空转齿轮58、60、62、64和66。空转齿轮58和66的旋转分别旋转驱动辊52和54。
在本实施方式中,驱动辊54和空转齿轮66没有固定到支撑板30,并且空转齿轮58不直接与空转齿轮66啮合。支撑臂68具有通过螺栓72轴向地连接到空转齿轮64的第一端,和通过销74轴向地连接到驱动辊54和空转齿轮66的第二端。因此,驱动辊54、空转齿轮66和支撑臂68绕螺栓72栓转地固定到支撑板30,同时也允许空转齿轮66保持与空转齿轮64啮合。扭簧70具有围绕销(未显示)固定的第一端、与螺栓72轴向对齐的主体和接合偏置块38的第二端。这以图2A中的逆时针方向将扭矩施加在支撑臂68上。在偏置块38处,扭簧70在槽46中延伸,并且抵靠销50被偏压。因此,销50可以用于调节支撑臂68上的扭矩。
当销50朝向槽48的右侧(箭头76的方向)移动时,驱动辊54、空转齿轮66和支撑臂68围绕螺栓72枢转(在图2A中的逆时针方向上)。这增加了驱动辊52和54之间的接触力。如下所述,销50期望地位于槽48中,使得驱动辊52和54之间的接触力大约为零(或稍大于零),从而最小化驱动辊52和54之间的压力。销50则可以固定在槽48中的给定位置处,从而以期望的使驱动辊54预受载荷。
支撑臂68的角位置提供用于对驱动辊52和54之间丝状体滑移进行自校正的机构。在操作期间,当施加阻力(FR)(在箭头78的方向上)时,驱动辊52和54由于由丝状体对被推入到和推进螺杆泵24中的抵抗而产生的阻力(FR)而作用。与驱动辊52和54接触的丝状体具有基于丝状体的成分和结构而给定的摩擦系数(μ)。因而,假设驱动辊52和54之间的接触力大约为零(从扭簧70的位置),当施加到丝状体驱动力(FD)乘以丝状体的摩擦系数(μ)大于阻力(FR)时,驱动辊52和54驱动丝状体朝向出口块36,而丝状体没有滑移。因此,用于丝状体滑移的阈值在:
FDxμ=FR (方程1)或
μ=FD/FR (方程2)
当阻力(FR)和驱动力(FD)分别地表示为力矢量(即,图2A中的力矢量FR和FD)时,支撑臂68与垂直于支撑块38的轴线(平行于力矢量FD)之间的角度θ可以由以下方程式定义:
tan(θ)=FR/FD (方程3)
其代替方程式2,使得:
θ=arctan(μ) (方程4)
因此,以角度θ定向的支撑臂68提供自校正丝状体滑移的机构,因为驱动辊52和54之间的夹紧力响应阻力(FR)的改变而改变。例如,当阻力(FR)由于螺杆泵24中的抵抗压力增加时,驱动辊52和54之间的夹紧力增加,以在丝状体上提供更高水平的驱动力(FD),从而减少丝状体滑移的风险。优选地,角度θ被确定以稍微地小于arctan(μ),和/或驱动辊52和54之间的接触力被设定为稍微大于零,以提供克服滑移的安全余量。
在操作期间,构建或支撑材料的丝状体通过供给块32的通道42、通过丝状体管34和驱动辊52和54之间被供给。驱动电动机16然后旋转驱动齿轮56。这相应地旋转空转齿轮58、60、62、64和66(如由图2A中的旋转箭头所示)。空转齿轮58的旋转相应地旋转驱动辊52,而空转齿轮66的旋转相应地旋转驱动辊54。驱动辊52和54的转动夹紧丝状体的连续部分并将所述丝状体的连续部分拉向出口块36。
如图2B所示,出口块36包括基部80a和罩部80b,所述基部和所述罩部限定出口通道44,并且基部80a和罩部80b通过螺栓81固定到一起。出口块36提供用于将丝状体从齿轮系统40朝向螺杆泵24引导的机构,并且减少丝状体在受到的阻力(FR)下弯曲的风险。出于清洁和修理目的(例如,移除出口通道44中堵塞的丝状体),罩部80b期望可移除地固定到基部80a,以允许进入出口通道44。
在可选的实施方式中,当单独设计必要时,齿轮系统40可以包括另外或较少数量的空转齿轮。在没有提供自紧固能能力的另一个可选的实施方式中,齿轮58轴向地连接到驱动电动机16,并且直接与空转齿轮66啮合。这允许驱动电动机16直接旋转齿轮58和驱动辊52,所述齿轮和所述驱动辊相应地旋转空转齿轮66和驱动辊54。在本实施方式中,驱动辊54和空转齿轮66可旋转地固定到支撑板30,并且可以省略驱动齿轮56和空转齿轮60、62和64。在另一个可选的实施方式中,驱动辊54可以被空转空转辊(未显示)代替,所述空转辊不直接或间接地与驱动辊52接合。在本实施方式中,空转空转辊可旋转地固定到支撑板30(即,没有自紧固能力),或可旋转地固定到偏置的支撑臂68(如图2A和2B所示)。
图3是沿着纵向轴线L延伸的螺杆泵24的侧视图。如从图3中上下所示,螺杆泵24还包括挤压末端82、桶状外壳84、液化器85(通过液化器外壳86和88限定)、供给通道90、螺杆泵主体92、叶轮94和安装板96。挤压末端82可移除地连接到桶状外壳84,并且是螺杆泵24一部分,可流动材料从所述螺杆24的一部分挤压。
桶状外壳84是包围叶轮94的独立的圆周外壳部件,并且期望地与液化器外壳86一体形成。液化器外壳86和88是外壳部件,所述外壳部件固定在一起(例如,螺栓连接)以限定液化器85,从而包围叶轮94的中心部分。供给通道90是进入到上叶轮外壳88的开口,并且被构造成接收来自丝状体输送组件22(显示在图1A和1B中)的构建或支撑材料的丝状体。
螺杆泵24还包括在安装板96上方、用于接收定位螺钉(未显示)的螺纹孔98,所述螺纹孔是螺杆泵24中的开口。螺杆泵主体92固定到上叶轮外壳88,并且是包围叶轮94的上部的外壳部件。安装板96是固定到螺杆泵主体92的板,并且是螺杆泵24的、固定到框架12(显示在图1A和1B中)的一部分。螺杆泵主体92包括孔口100,所述孔口在液化器外壳88上方的位置处延伸通过螺杆泵主体92,并且提供开口,通过所述开口能够看见叶轮94。
当将皮带轮28安装在框架12上时,皮带轮28通过电动机驱动的皮带(未显示)旋转,这相应地使叶轮94旋转。当叶轮94旋转时,构建或支撑材料的丝状体通过供给通道90被供给螺杆泵24,并且被熔化成可流动状态。可流动材料然后通过叶轮94的旋转被挤压通过挤压末端82。
图4是图3中部分4-4的剖视图,其中图示了螺杆泵24的内部区域。如图4所示,挤压末端82包括喷嘴102和孔104,其中孔104是喷嘴102中的、沿着纵向轴线L的用于挤压可流动材料的开口。喷嘴102可移除地拧在桶状外壳84上,这允许喷嘴102在需要时(例如,对于提供不同的孔直径来说)被替换。
桶状外壳84、液化器外壳86和88、和螺杆泵主体92限定内部桶体106,内部桶体106是沿着纵向轴线L延伸的中央圆柱形腔。如图所示,桶体106可通过孔口100进入。叶轮94沿着纵向轴线L延伸通过桶体106,并且叶轮94和桶体106理想地至少在桶状外壳84和液化器85内具有紧密配合的表面(即,叶轮94的外径紧密地配合桶体106的直径)。
液化器外壳86和88还限定液化器腔108,所述液化器腔是在液化器85中的盘形腔,并且被连接到供给通道90。由于液化器85的盘形形状,液化器85通常称为“冰球(hockey puck)液化器”。如下所述,液化器85熔化通过供给通道90进入液化器腔108的固态丝状体的连续部分。液化器外壳86和88包括加热棒110,加热棒110将热量供应给液化器腔108。这以对流的方式加热液化器腔108,从而允许液化器腔108将丝状体热熔化为期望的可流动粘度。
螺杆泵主体92还包括上主体加热器111,所述上主体加热器位于液化器外壳88和孔口100之间。加热器111在液化器外壳88上方防止可流动材料与桶体106固化。这是理想的,使得可流动材料的弯液面在桶体106中上升和下降,从而在丝状体输送组件22和螺杆泵24之间的供给速度瞬间不平衡期间,提供解耦功能(decoupling function)。
在可选的实施方式中,螺杆泵24可以包括另外的或较少的加热元件以获得桶体106和/或液化器腔108中期望的热剖面(thermal profile)。在一个实施方式中,通过用一个或多个热电偶(未显示)监控的温度反馈,可以独立控制一个或多个加热棒110和加热器111。
叶轮94在螺杆泵24的顶部112处固定到皮带轮28。如下所述,这允许皮带轮28的旋转运动相应地旋转叶轮94。叶轮94具有在叶轮94的外表面被切成的多个螺旋槽,所述螺旋槽与桶体106形成粘性泵。螺旋槽的上部(称为部分94a)具有相对较深的槽,从而以相对较高体积和较低压力(即,叶轮94输送区)提供粘性泵送。螺旋槽的下部(称为部分94b)具有相对较浅的槽,从而以相对较高的压力和较低体积(即,叶轮94的增压区)提供粘性泵送。
在操作期间,构建或支撑材料的丝状体被供给液化器腔108并且被熔化成期望的可流动粘度。当丝状体的连续部分继续供给到液化器腔108中时,丝状体在熔化的同时圆周向内移动(即,以螺旋形方式)。熔化的可流动材料最终到达叶轮94的输送区(即,邻近叶轮94的部分94a),在所述输送区中,叶轮94的旋转驱动可流动材料进入到叶轮94的增压区(即,邻近叶轮94部分94b)。叶轮94的部分94b增加可流动材料的压力,并且将可流动材料通过挤压末端82的孔104挤压。可流动材料的挤压速度则可以通过叶轮94的旋转速度(所述旋转速度与驱动电动机18的驱动力相对应)来控制。挤压材料以期望的图案沉积以形成3D物体和/或支撑结构。
螺杆泵24有益于生产高流量和快速可预测的响应时间。为提高泵的响应时间,通过最小化叶轮94和桶体106之间的间隙,可理想地减小桶体106中的构建材料体积。例如,具有0.25英寸直径的叶轮和0.001英寸的间隙的圆柱形螺杆泵具有小于0.010秒的时间常数,所述螺杆泵通过0.016英寸直径的喷嘴可以每秒钟泵送20,000立方微英寸。相比较,通过0.016英寸直径的喷嘴每秒钟仅可以泵送2,000立方微英寸的液化器泵可具有大于0.020秒的时间常数。
在丝状体以比可流动材料被挤出孔104快的方式供给到液化器腔108中的情况下,过量可流动材料可能向上回流通过桶体106。如果阻塞过大(例如,如果孔104被阻塞),过量可流动材料可能通过孔口100从螺杆泵24流出。孔口100防止螺杆泵24的顶部112意外地暴露给可流动材料,并且确保回流构建材料不会在液化器腔108中停留很长而使热退化(例如,退色),并然后在随后的过程中被再混合和挤压。孔口100也有助于排出液化器腔108中出现的任何气体(例如,水蒸汽)。
在一个实施方式中,螺杆泵24还可以包括在桶体106中的一个或多个溢流传感器(未显示)。溢流传感器可以用于监控可流动材料的回流快要达到孔口100的时间。如果溢流传感器(一个或多个)检测到可流动材料的阻塞,溢流传感器(一个或多个)则可以控制驱动电动机16(显示在图1A、1B、2A和2B中),以减少或停止丝状体的供给速度。
在另外可选的实施方式中,液化器85和桶状外壳84(可任选地)可以被移除并且夹紧到螺杆泵主体92。这允许多个液化器易于交换,以便维修或更换。
图5是螺杆泵24的顶部112的放大视图,其中进一步说明皮带轮28和叶轮94之间的连接。如图所示,螺杆泵24的顶部112包括叶轮延伸部114、顶部轴承116、底部轴承118、螺纹环120、间隔件122和弹簧124。叶轮延伸部114固定到皮带轮28和叶轮94,从而允许皮带轮28的旋转相应地使叶轮94围绕纵向轴线L旋转。
顶部轴承116和底部轴承118设置在螺杆泵主体92和叶轮延伸部114之间。底部轴承118和弹簧124装载在间隔件122的相对表面上,其中,弹簧124抵靠间隔件122被偏置。叶轮延伸部114的邻近底部轴承118的部分的直径被底切,从而不能够径向限制底部轴承118。因此,叶轮94和叶轮延伸部114仅通过顶部轴承116和叶轮94与桶状外壳84(显示在图3中)之间的水力对中力(hydrodynamic centering force)而被径向限制。
顶部轴承116位于底轴承118上方,并且通过螺纹环120轴向地保持在螺杆泵主体92内。电动机驱动的皮带(未显示)和顶部轴承116理想地沿着水平轴线H对齐,从而使电动机驱动的皮带的径向负载作用,并且减少设置在叶轮94上的任何潜在的侧负载。由于叶轮94和桶体106之间紧密的径向间隙,即使在低旋转速度下,期望的是减小叶轮94和桶体106之间的接触,水力对中力在所述低旋转速度下较低。
螺纹环120位于皮带轮28中并在皮带轮28下方,并用于调节挤压末端82(显示在图3和4中)和叶轮94之间的间隙。为了调节挤压末端82和叶轮94之间的间隙,旋转螺纹环120,这压缩或释放弹簧124上偏置力(根据间隙减小或增加)。当获得期望的间隙尺寸时,定位螺钉(未显示)插入到螺纹孔98(显示在图3中)中,以防止螺纹环120的进一步旋转。
图6是在图3中截得的部分6-6的剖视图,其中说明液化器85中的液化器腔108。如图所示,液化器腔108包括螺旋形挡板202。螺旋挡板202使熔化的丝状体以减少的螺旋的方式流向叶轮94,从而减少形成熔化的可流动材料的停滞凹穴(pocket)的风险。
可流动材料以与从挤压末端82(显示在图3和4中)的挤压流量匹配的流量期望地输送给桶体106。过充满的桶体106可以使可流动材料回流通过孔口100(显示在图3和4中)。可选地,未充满的桶体106可以导致低流动体积。通过控制来自丝状体输送组件22(显示在图1A、1B、2A和2B)丝状体供给速度,液化器85中的流量可以与从挤压末端82挤压的流量相匹配。
丝状体供给速度可以响应于一个或多个反馈传感器,从而控制驱动电动机16(显示在图1A、1B、2A和2B)。例如,力传感器(例如,负载单元)可以设置在框架12或驱动电动机16上,以监控液化器85的流量。合适的力传感器的示例公开在Zinniel等人的美国专利No.6,085,957中,其中力传感器与正在被驱动进入液化器85中的丝状体的力作用。因此,如果测量的力太低,液化器85的流量被增加,而如果力太大,则减少流量。通过匹配液化器85的响应特征,还可获得可流动材料的开环调节。另外,如上所述,孔口100处的溢流传感器可以用于以相同的方式调节丝状体的供给速度。
图7A和7B分别是叶轮94的侧视图和透视图。如图所示,两个沟槽起始于部分94a中,每个槽过渡到部分94b中的浅槽。如上所述,部分94a具有相对较深的槽以提供相对较高体积和较低压力的粘性泵送(即,叶轮94的输送区)。相应地,部分94b具有相对较浅的槽以提供相对较高的压力和较低体积的粘性泵送(即,叶轮94的增压区)。
图8是沿纵向轴线L延伸的螺杆泵24的侧视图,其中,螺杆泵24与外部加热系统128一起使用。图9是在图8中截得的部分9-9的剖视图,进一步说明了外部加热系统128。如图8和9中所示,外部加热系统128包括上加热盘管130和下加热盘管132,所述上加热盘管和所述下加热盘管连接到热控制源(未显示)。上加热盘管130围绕桶状外壳84缠绕,以在挤压过程期间将热量传递给桶状外壳84。相似地,下加热盘管132围绕挤压末端82缠绕,以在挤压过程期间将热量传递给挤压末端82。
在一个实施方式中,上加热盘管130和下加热盘管132中的一个或两个都通过利用一个或多个热电偶(未显示)监控的温度反馈而被独立控制。外部加热系统128的使用减少当利用叶轮94泵送时可流动材料冷却的风险,否则这可能导致可流动材料阻塞桶体106、孔口100和/或孔104。在可选的实施方式中,另外的热区也可以在液化器腔108上方加在液化器腔108和挤压末端82之间。桶体106和孔104所需要的热量通常随着通过螺杆泵24的流量的近期历史而变化。
图10是沿着纵向轴线L延伸的螺杆泵24的放大侧视图,其中,螺杆泵24与热套管134一起使用。图11是在图10中截得的部分11-11的剖视图,进一步还说明热套管134。如图10和11所示,热套管134包括套管外壳136、上加热盘管138和下加热盘管140。套管外壳136围绕桶状外壳84延伸,并且大致包围上加热盘管138。上加热盘管138围绕桶状外壳84缠绕以在挤压过程期间将热量传递给桶状外壳84。类似地,下加热盘管140围绕挤压末端82缠绕以在挤压过程期间将热量传递给挤压末端82。
在一个实施方式中,上加热盘管138和下加热盘管140中的一个或两个都通过利用一个或多个热电偶(未显示)监控的温度反馈而被独立控制。这提供沿着挤压末端82和桶状外壳84的较大的温度控制。例如,上加热盘管138可以被控制以沿着利用热电偶监控的桶状外壳84获得期望的温度剖面。类似的布置也被应用到下加热盘管140。在可选的实施方式中,另外的热区也可以在液化器腔108上方加在液化器腔108和挤压末端82之间。在另一个实施方式中,被压缩的气体源(未显示)可以连接到气体入口141a。在此实施方式中,被加热或冷却的气体在桶状外壳84和套管外壳136之间可以流入到气体入口141a中,并且从气体出口141b流出。这提供沿着挤压末端82和桶状外壳84的进一步的温度控制。以上在图8-11中公开的外部加热系统和冷却系统是可以与螺杆泵24一起使用的合适的外部温度控制系统的示例。
图12是螺杆泵224的透视图,所述螺杆泵是泵系统10中使用的螺杆泵24的可选物。为便于说明,与螺杆泵24相对应的部件的附图标记增加200。在此实施方式中,螺杆泵224包括一对液化器342和344,所述液化器以与螺杆泵24的液化器85(显示在图3、4和6中)相同的方式作用。螺杆泵224也包括支撑架346和348,所述支撑架围绕桶状外壳284固定,用于分别将液化器342和344固定到桶状外壳284。
液化器342包括液化器外壳350和352、供给通道354和在液化器外壳352中的出口通道(未显示),其中,液化器外壳352是液化器342的通过支撑架346固定到桶状外壳284的部分。这允许来自液化器342的出口通道与桶体306(未显示)相交。液化器344包括液化器外壳356和358、供给通道360和出口通道362,其中,液化器外壳356是液化器344的通过支撑架348固定到桶状外壳284的部分。这允许出口通道362与桶体306和来自液化器342的出口通道相交。
液化器342和344允许多种材料被供给到桶体306中。例如,在一个实施方式中,构建材料和支撑材料可以以连续挤压步骤通过桶体306和挤压末端282被供给,而不需要对多个端部进行校准和对准。当从一种材料转换到另一种材料时,在沉积第二材料之前,第一材料期望被清洗。可以在将挤压末端282放置在废物容器(未显示)上的同时通过供应和挤压第二材料足够的时间以从桶体306清除第一材料而完成清洗。
可选地,多种构建或支撑材料可以一起混合(通过叶轮294)并挤压。这允许不同类型的构建或支撑材料被混合以增加3D物体或支撑结构的期望的物理性能。在此实施方式中,第一构建或支撑材料的丝状体(未显示)可以被供给到通道354中,并且在液化器342中被熔化(如上对于液化器85的描述)。熔化的可流动材料然后流动通过液化器342的出口通道,并进入桶体306。类似地,第二构建或支撑材料的丝状体(未显示)可以被供给通道360中,并且在液化器344中被熔化(如上对于液化器85的描述)。熔化的可流动材料然后流动通过出口通道362,并进入桶体306。当可流动材料被迫通过桶体306朝向挤压末端282时,叶轮300则混合可流动材料。被混合的可流动材料然后被挤压通过挤压末端382以形成产生的3D物体或支撑结构。
多个液化器(例如,液化器342和344)也可允许使用不同颜色的构建和支撑材料。不同颜色的丝状体可以被同时供应到螺杆泵242,并且可以与螺杆泵242的混合作用结合,以为产生的3D物体或支撑结构产生全部色域。
在可选的实施方式中,螺杆泵242可以包括多于两个的液化器。当使用多个液化器时(例如,与螺杆泵242一起使用),每个丝状体利用其自身的材料推进机构(例如,丝状体输送组件22)被期望地供给给定的液化器,以独立地控制丝状体的供给速度。
图13是挤压装置400的俯视图,其是用于螺杆泵24的驱动电动机位于远离泵系统10的远距离位置处的可选实施例。这有利于最小化通过泵系统10所承载的有效载荷。另外,此布置最小化到桶架的支架的线的数量,并且也允许对X-Y-Z桶架和泵使用相同电动机(例如,较低成本利益)。
如图所示示,挤压装置400包括泵系统402、X-Y桶架404、远程驱动电动机406、第一滑轮部分408和第二滑轮部分410。除了驱动电动机18被省略之外(所述驱动电动机被远程驱动电动机406代替),泵系统402类似于泵系统10。泵系统402包括皮带轮403,所述皮带轮以与皮带轮28(显示在图1A和1B中)相同的方式作用,用于旋转螺杆泵叶轮(未显示)。X-Y桶架404是用于在X-Y平面围绕挤压装置400移动泵系统402以沉积构建和/或支撑材料的桶架组件。远程驱动电动机406包括电动机滑轮412,其以与电动机滑轮26(显示在图1B中)相同的方式作用。
第一滑轮部分408包括驱动皮带414、中间轴输入滑轮416和空转滑轮418,其中,驱动皮带414围绕电动机滑轮412、中间轴输入滑轮416和空转滑轮418成一圈。第二滑轮部分410包括驱动皮带420、中间轴滑轮422和空转滑轮424,其中驱动皮带420围绕皮带轮403、中间轴输出滑轮422和空转滑轮424成一圈。中间轴输出滑轮422轴向地连接到中间轴输入滑轮416。
此布置允许远程驱动电动机406旋转皮带轮403(并相应地旋转泵系统402的螺杆泵叶轮)。在操作期间,远程驱动电动机406使电动机滑轮412旋转。这相应地使驱动皮带414旋转中间轴输入滑轮416。中间轴输入滑轮416的旋转使中间轴输出滑轮422转动,从而使驱动皮带420旋转皮带轮403(和螺杆泵的叶轮)。
远程驱动电动机406期望地被移动以“减去(subtract out)”X-Y桶架404的运动,使得X-Y桶架404的运动不使叶轮旋转。可以控制远程驱动电动机406以抵消X-Y桶架404的运动的旋转速度可以根据如下方程式进行数学算出:
使用如下定义:
W电动机=电动机旋转速度
W中间轴=中间轴旋转速度
PD电动机=电动机滑轮节径(pitch diameter)
PD中间轴输入=中间轴输入滑轮节径
PD中间轴输出=中间轴输出滑轮节径
PD螺杆=螺杆滑轮节径
Vx=X方向上的支架速度
Vy=Y方向上的支架速度
中间轴和电动机的转动速度通过方程式给出:
W中间轴=W电动机(PD电动机/PD中间轴输入)-Vx/πPD中间轴输入 (方程5)
W螺杆=W中间轴(PD中间轴输出/PD螺杆)-Vy/πPD螺杆 (方程6)
对方程6中的W中间轴用方程5替换,得到:
W螺杆=(W电动机(PD电动机/PD中间轴输入)-Vx/πP中间轴输入)(PD中间轴输出/PD螺杆)-Vy/πPD螺杆
(方程7)
方程式7可以被变形用于求解W电动机:
(W螺杆+Vy/πPD螺杆)(PD螺杆/PD中间轴输出)=W电动机(PD电动机/PD中间轴输入)-Vx/πPD中间轴输入
(方程8)
W电动机=((W螺杆+Vy/πPD螺杆)(PD螺杆/PD中间轴输出)+Vx/πPD中间轴输入)PD中间轴输入/PD电动机
(方程9)
根据方程9,远程驱动电动机406转动速度(W电动机)与X-Y桶架404的运动有关,这允许螺杆泵叶轮通过驱动皮带414和420进行精确控制。
用于每个丝状体输送组件的驱动电动机(例如,驱动电动机16)也可以安装在挤压头、X-Y桶架404上,或者以类似的方式安装在挤压装置400的固定部分上。在远程位置处,丝状体输送组件可以提供适当的力以将丝状体推入到螺杆泵中。这降低由X-Y桶架404承载的有效负载重量、简化机械组件、并且最小化X-Y桶架404上的支架的尺寸。
如上所述,泵系统10和402中使用的构建材料期望以丝状体形式提供。合适的丝状体材料和丝状体源的示例公开在Swanson等人的美国专利No.6,923,634和Comb等人的美国出版No.2005/0129941中。用于构建材料的适当材料的示例包括任何类型的可挤压的热塑性材料,例如,丙烯腈-丁二烯-苯乙烯((ABS))、聚碳酸酯、聚苯砜(polyphenylsulfone)、聚砜、尼龙、聚苯乙烯、非晶态聚酰胺、聚酯、聚亚苯基醚(polyphenylene ether)、聚亚安酯、聚醚醚酮(polyetheretherketone)和其共聚物及其组合。同时上述说明所涉及的构建材料、泵系统10和402的使用也适用于挤压支撑材料以构建支撑结构。合适的水溶性支撑材料的示例包括在市场上可买得到的位于美国明尼苏达州Eden Prairie的Stratasys公司商标为“WATERWORKS”和“SOLUBLE SUPPORTS”的水溶性支撑材料。
如上所述,泵系统10(和泵系统402)提供用于作为基于挤压的分层制造系统中的挤压头的适当挤压系统。泵系统10的有益特性的示例包括快速和恒定响应时间、高流量(例如,20,000立方微英寸/秒)、解耦(decouple)流量和响应时间、沉积多种类型的构建和支撑材料、当材料改变时最小化需要替换的部件数量、最小化挤压头和X-Y桶架质量、在喷嘴之间不需要进行校准或对准、最小化供给原材料的成本、最小化泵制造成本、最小化磨损部件、消除螺杆对孔的未对准、在高温下运转以泵送高温材料(例如,400℃以上)和允许用于全色谱造型。
虽然本发明已经参照优选实施方式说明,但是本领域技术人员将认识到在不背离本发明的精神和保护范围的情况下,可以在形式和细节上做改变。例如,虽然在上述说明中,泵系统10用在基于挤压的分层制造系统中,但是泵系统10也适合用于构建3D物体的任何类型的基于挤压的沉积系统中。
Claims (20)
1.一种泵系统,包括:
第一驱动电动机和第二驱动电动机;
输送组件,所述输送组件与所述第一驱动电动机能够操作地接合,并被构造成在所述第一驱动电动机的操作力下供给固体材料;和
螺杆泵,所述螺杆泵包括:
外壳,所述外壳至少部分地限定所述螺杆泵的桶体;
挤压末端,所述挤压末端在所述桶体的第一端处固定到所述外壳;
液化器,所述液化器固定到所述外壳并且与所述桶体相交,所述液化器被构造成接收从所述输送组件供给的所述固体材料,以至少部分地熔化接收的所述固体材料,并且将所述至少部分熔融的材料引导到所述桶体;和
叶轮,所述叶轮至少部分地延伸通过所述桶体,并且被构造成在所述第二驱动电动机的操作动力下将引导到所述桶体的所述至少部分熔融的材料朝向所述挤压末端驱动。
2.根据权利要求1所述的泵系统,其中:所述固体材料设置为丝状体,并且所述输送组件包括:
多个啮合齿轮,其中,所述啮合齿轮中的至少一个是与所述第一驱动电动机能够操作地接合的所述输送组件的一部分;
第一驱动辊,所述第一驱动辊与所述多个啮合齿轮中的第一齿轮轴向接合;和
第二驱动辊,所述第二驱动辊与所述多个啮合齿轮中的第二齿轮轴向接合,其中,所述第一驱动辊和所述第二驱动辊被构造成接合所述丝状体。
3.根据权利要求2所述的泵系统,其中:所述第二驱动辊被偏置以响应于所述丝状体的阻力的变化而改变所述第一驱动辊和所述第二驱动辊之间的夹紧力。
4.根据权利要求1所述的泵系统,其中:所述液化器包括与所述叶轮大致同心的圆柱形腔。
5.根据权利要求4所述的泵系统,其中:所述液化器包括螺旋形挡板。
6.根据权利要求1所述的泵系统,其中:所述叶轮至少部分地限定所述桶体中的增压区和运输区,所述运输区与所述液化器相邻,而所述增压区与所述挤压末端相邻。
7.根据权利要求1所述的泵系统,还包括外部温度控制系统,所述外部温度控制系统围绕所述外壳的至少一部分延伸。
8.根据权利要求1所述的泵系统,其中:所述液化器是第一液化器,而所述固体材料是第一固体材料,其中,所述泵系统还包括第二液化器,所述第二液化器固定到所述外壳并与所述桶体相交,所述第二液化器被构造成接收第二固体材料,以至少部分地熔化接收的所述第二固体材料,并将至少部分熔融的第二材料引导到所述桶体。
9.一种泵系统,用于挤压作为丝状体被提供的热塑性材料,所述泵系统包括:
一对驱动辊,所述一对驱动辊被构造成供给所述丝状体的连续部分;
外壳,所述外壳至少部分地限定桶体,所述桶体具有第一端和孔口;
液化器外壳,所述液化器外壳固定到所述外壳,并且限定液化器腔,所述液化器腔在所述桶体的所述第一端和所述桶体的所述孔口之间的位置处绕所述桶体圆周地延伸;
供给通道,所述供给通道延伸通过所述液化器外壳,并且被构造成将从所述一对驱动辊供给的所述丝状体的所述连续部分引导到所述液化器腔;
挤压末端,所述挤压末端在所述桶体的所述第一端处固定到所述外壳;和
叶轮,所述叶轮延伸通过所述桶体,并且包括多个沟槽,所述沟槽至少在所述液化器腔和所述桶体的所述第一端之间沿着所述叶轮的纵向轴线在深度上变化。
10.根据权利要求9所述的泵系统,其中:所述一对驱动辊中的至少一个被偏置以响应于所述丝状体的阻力的变化而改变所述一对驱动辊之间的夹紧力。
11.根据权利要求9所述的泵系统,其中:所述叶轮至少部分地限定所述桶体中的增压区和运输区,所述运输区与所述液化器腔相邻,而所述增压区与所述挤压末端相邻。
12.根据权利要求11所述的泵系统,其中:所述运输区至少在所述液化器腔和所述孔口之间延伸。
13.根据权利要求9所述的泵系统,其中:所述一对驱动辊和所述叶轮被构造成由分开的驱动电动机操作。
14.一种用于构建三维物体的挤压装置,所述挤压装置包括:
泵系统,所述泵系统包括:
第一驱动电动机;
丝状体输送组件,所述丝状体输送组件与所述第一驱动电动机能够操作地接合,并且被构造成在所述第一驱动电动机的操作动力下供给热塑性材料的丝状体;和
螺杆泵,所述螺杆泵包括:
外壳,所述外壳至少部分地限定所述螺杆泵的桶体;
挤压末端,所述挤压末端在所述桶体的第一端处固定到所述外壳;
液化器,所述液化器固定到所述外壳,并且与所述桶体相交,所述液化器包括供给通道,所述供给通道被构造成接收从所述丝状体输送组件供给的所述丝状体;和
叶轮,所述叶轮至少部分地延伸通过所述桶体;
桶架组件,所述桶架组件被构造成在至少一个方向上移动所述泵系统;
第二驱动电动机,所述第二驱动电动机设置在远离所述泵系统和所述桶架组件的位置处;
皮带轮组件,所述皮带轮组件被构造成使所述第二驱动电动机与所述泵系统的所述叶轮接合,从而允许所述叶轮在所述第二驱动电动机的操作动力下旋转。
15.根据权利要求14所述的挤压装置,其中:所述皮带轮组件包括:
第一滑轮部,所述第一滑轮部包括:
第一滑轮;和
第一驱动皮带,所述第一驱动皮带与所述第一滑轮和所述第二驱动电动机接合,从而允许所述第一滑轮在所述第二驱动电动机的操作动力下旋转;
第二滑轮部,所述第二滑轮部包括:
第二滑轮,所述第二滑轮轴向地连接到所述第一滑轮,从而允许所述第一滑轮的旋转使所述第二滑轮旋转;和
第二驱动皮带,所述第二驱动皮带与所述第二滑轮和所述叶轮接合,从而允许所述第二滑轮的旋转使所述叶轮旋转。
16.根据权利要求15所述的挤压装置,其中:所述第二驱动电动机被构造成减去所述桶架组件的运动,使得所述桶架组件的所述运动不使所述叶轮旋转。
17.根据权利要求14所述的挤压装置,其中:所述丝状体输送组件包括:
多个啮合齿轮,其中所述啮合齿轮中的至少一个是与所述第一驱动电动机能够操作地接合的所述丝状体输送组件的一部分;
第一驱动辊,所述第一驱动辊与所述多个啮合齿轮中的第一齿轮轴向接合;和
第二驱动辊,所述第二驱动辊与所述多个啮合齿轮中的第二齿轮轴向接合,其中所述第一驱动辊和所述第二驱动辊被构造成接合所述丝状体。
18.根据权利要求17所述的挤压装置,其中:所述第二驱动辊被偏置以响应于所述丝状体的阻力的变化而改变所述第一驱动辊和所述第二驱动辊之间的夹紧力。
19.根据权利要求14所述的挤压装置,其中:所述液化器包括与所述叶轮大致同心的圆柱形腔。
20.根据权利要求14所述的挤压装置,其中:所述叶轮至少部分地限定所述桶体中的增压区和运输区,所述运输区与所述液化器相邻,而所述增压区与所述挤压末端相邻。
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CN104552959A (zh) * | 2015-01-30 | 2015-04-29 | 江苏浩宇电子科技有限公司 | 3d打印机旋转式双喷头装置 |
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JP2019532856A (ja) * | 2016-10-21 | 2019-11-14 | エンジンガー ゲーエムベーハー | 三次元物体を製造するための方法および装置 |
JP7160439B2 (ja) | 2016-10-21 | 2022-10-25 | エンジンガー ゲーエムベーハー | 三次元物体を製造するための方法および装置 |
CN111278628A (zh) * | 2017-10-03 | 2020-06-12 | 捷普有限公司 | 用于增材制造打印头的设备、系统和方法 |
CN111278628B (zh) * | 2017-10-03 | 2022-04-22 | 捷普有限公司 | 用于增材制造打印头的设备、系统和方法 |
CN114368149A (zh) * | 2022-02-09 | 2022-04-19 | 深圳市创想三维科技股份有限公司 | 打印喷嘴的使用时长检测方法、装置、打印机和存储介质 |
CN114368149B (zh) * | 2022-02-09 | 2024-01-05 | 深圳市创想三维科技股份有限公司 | 打印喷嘴的使用时长检测方法、装置、打印机和存储介质 |
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EP2117793B1 (en) | 2014-07-16 |
CN101605641B (zh) | 2012-01-18 |
US7891964B2 (en) | 2011-02-22 |
JP2010517830A (ja) | 2010-05-27 |
EP2117793A1 (en) | 2009-11-18 |
US20080213419A1 (en) | 2008-09-04 |
WO2008100467A1 (en) | 2008-08-21 |
JP5039795B2 (ja) | 2012-10-03 |
EP2117793A4 (en) | 2013-01-09 |
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