CN1898074A - 设置有两台冷却扇的预成型件加热炉 - Google Patents
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Abstract
本发明涉及一种用于加热预成型件(10)的加热炉(22),所述加热炉包括上部纵向加热通道(24),所述通道由两个壁(40,42)的纵向竖立内表面(36,38)横向地限定,其中一个壁(40)装配有加热系统(46),而另一个壁(42),具有通风孔(50),所述通风孔用于使由鼓风机(52)吹出的空气横向地流经它们,且在所述加热炉中,所述预成型件(10)的一个部分(16)被保持在所述加热通道(24)的外侧,鼓风机(52)把空气横向地吹向所述预成型件(10)的所述部分(16),以保持所述预成型件(10)的该部分(16)的组成材料的温度低于其软化点,其特征在于,所述鼓风机(52)包括两台独立的风扇(54a,54b),所述风扇分别把空气输送到所述通风壁(42)和所述预成型件(10)的所述部分(16)。
Description
技术领域
[01]本发明涉及用于加热预成型件,尤其是塑料容器预成型件的加热炉。
背景技术
[02]本发明更特别地涉及用于加热预成型件,尤其是塑料容器预成型件的加热炉,该加热炉包括纵向加热通道,该通道由两个壁的相互平行的纵向竖立内表面横向地限定,其中一个壁为加热壁,装配有加热系统,而另一个壁为通风壁,具有通风孔,这些通风孔用于使由鼓风机吹出的空气经过这些通风孔从上游加热通道外侧横向地通向下游加热通道内侧,且在该加热炉中,预成型件的第一部分在加热通道中被加热,而预成型件的第二部分通过一个纵向开口被保持在加热通道的外侧,该纵向开口形成在加热通道的两个壁的纵向边缘之间,鼓风机把空气横向地吹向预成型件的第二部分,以保持该第二部分的组成材料的温度低于其软化点。
[03]塑料容器,尤其是例如由聚乙烯对苯二酸酯(PET)制成的瓶子通常由预成型件制成,该预成型件经由吹制操作或拉伸-吹制模制其本体和端壁而成形为瓶子。该预成型件通常具有试管的形状,其颈部已经具有将要制成的容器的喉部的最终形状。该颈部具有例如用于接受螺杆阻塞物的螺纹。
[04]在进行吹制模制操作之前,必须在加热炉中加热预成型件以软化塑料。为此,形成预成型件的塑料被加热到一个高于其玻化过渡温度的温度。
[05]具有纵向加热通道的该类型的预成型件加热炉是已知的。冷预成型件由传输装置从通道的第一端被传输,然后沿通道运行,在该通道内被加热,而后经由通道的第二端露出。如此被加热的预成型件就已准备完毕,可用于吹制模制操作。
[06]为了确保预成型件的端壁和本体的圆柱形壁的深度加热,预成型件通常在运行穿过加热炉时围绕其自身旋转。而且,通道的一个壁装配有辐射加热装置,而另一个壁则设置有通风孔用于被吹出的空气的流经,以促进预成型件的本体的圆柱形壁的整个厚度均匀加热,而不过度加热形成预成型件的圆柱形壁的外表面的表面材料层。
[07]事实上,被吹出的空气带走了由加热装置引起的对流热,以促进其在本体的组成材料的厚度中产生的辐射的渗透。
[08]但是,具有其最终形状和最终尺寸的预成型件的颈部不可在加热和/或吹制模制操作过程中变形。因此,必须使颈部的温度保持低于玻化过渡温度。为此,预成型件的颈部通过一个在通道中的形成纵向狭槽的开口保持在通道外侧。
[09]为了防止热量从加热通道流通到预成型件的颈部,所述颈部被鼓风机所吹出的空气冷却。
[10]已知使用单个鼓风机来装配加热炉,一方面,把热量均匀地分布在加热通道中,而另一方面,又冷却了预成型件的颈部。此外鼓风机一段装配有变流装置,该变流装置位于相对于空气的流动方向的通道和预成型件的上游。从而,该变流装置把吹出空气流的一部分偏转到预成型件的颈部上。
发明内容
[11]本发明的目的在于改善在加热操所过程中预成型件的颈部被冷却的效力,而最优地把预成型件的本体的表面层保持在接近于塑料的玻化过渡温度的温度之下。为此,本发明提出了上述类型的加热炉,其特征在于,鼓风机包括两台独立的风扇,该两台独立的风扇分别把空气传送到通风壁,和传送到保持在加热通道外侧的预成型件的第二部分上。
[12]根据本发明的其它特征为:
[13]-输送管由具有隔墙的共同的箱的上室和下室形成;
[14]-鼓风机包括两个分离的空气进入管,每一个空气进入管都连有一台风扇;
[15]-鼓风机包括两个同轴的竖向轴,每一个轴驱动一台相连的风扇;
[16]-与通风壁相连的风扇所排出的气流速度由控制装置控制;和
[17]-风扇由两个分离的控制单元控制。
附图说明
[18]本发明的其它特征和优势将通过阅读下文的详细描述而更为清楚,为了理解下文的详细描述,读者应当参照附图,其中:
[19]-图1为侧视图,显示出吹制模制操作之后被转变成容器之前将要在加热炉中被加热的预成型件;
[20]-图2为侧视图,显示出根据本发明的教导制成且用于加热图1的预成型件的加热炉;以及
[21]-图3为图2的平面3-3中的横截面图,显示出装配有包括两台风扇的鼓风机的加热炉。
具体实施方式
[22]在下文中,将采用图2和3中所示的L,V,T坐标系统表示的纵向、竖向和横向,但不限于此。
[23]在以下描述中,使用一自上游至下游的取向来描述空气流的流动。
[24]相同的附图标记将用于指示同样的、类似的或对等的元件。
[25]图1显示了塑料例如聚乙烯对苯二酸酯(PET)制成的预成型件10,该预成型件将要在第一操作之后转变成塑料容器,在该第一操作中,预成型件被加热以软化塑料,然后在第二操作中,预成型件10被吹制模制以把预成型件成形为容器。
[26]预成型件10具有竖向轴A的试管形状。预成型件10的管状主体12在其上端被球形端壁14封闭,而其下端包括形成喉部的颈部16。
[27]颈部16已经具有成品容器的喉部的最终形状。因此,为了获得成品容器,只有管状本体12和其端壁14必须通过吹制模制而变形。因此,在吹制模制过程中,很重要的是只加热包括管状主体12和端壁14的预成型件10的第一部分到塑料的玻化过渡温度以上,而保持形成预成型件10的第二部分的颈部16的温度低于玻化过渡温度。
[28]颈部16在顶部由凸缘18限定。此处的颈部的外圆柱形表面20具有螺纹,用于接受螺纹阻塞物(未示),以密封容器。
[29]图2显示了一用于在加热操作过程中加热预成型件10的加热炉22。此处的加热炉22包括一纵向加热通道24,在该通道内部,所述预成型件10要按箭头F所示的方向移动。所述通道24包括:所述预成型件10的一第一进口端26,在图2的右侧;和预成型件10的一第二出口端26,在图2的左侧。
[30]如图2所示,所述炉22包括一用于把预成型件10从加热炉24的入口26传输到出口28的传输装置30。传输装置30包括一系列心轴32用于夹紧预成型件10,这些心轴从下轨34向上竖向延伸,该下轨在通道24下方延伸以与之平行。心轴32用于保持预成型件10在沿通道24运行时竖立。
[31]所给出的图2中所示的通道24的纵向直线形形状是一个示例,不具有限定性。
[32]图3显示了通道24的一部分。通道24由两个相互平行的分别属于第一壁40和属于第二壁42的竖直纵向内表面36和38限定,该第一壁位于图3中的右侧,该第二壁位于左侧。
[33]此处通道24在顶部和底部都没有封闭。从而,内表面36和38的下纵向边缘限定了纵向狭槽形式的下开口41。
[34]第一壁40装配有用于加热通道24的加热器46。在图3中所示的示例中,加热器46包括八个红外线灯,此处该八个红外线灯标记为IR1至IR8,且具有纵向管的形状。使用装置,此处为竖向分布的纵向凹槽48将管IR1至IR8由其每一个的端部保持靠近第一壁40的内表面36,每一个凹槽48用于容纳红外线灯IR1至IR8的一个端部。
[35]此处第二壁42包括横向穿过其厚度的孔50,以允许鼓风机52产生的气流渗透入通道24中。从而,如前言所述,气流冷却形成预成型件10的圆柱形壁的外表面的材料表面层。
[36]如图3中所示,预成型件10的管状本体12和端壁14被保持在加热通道24的内侧,而颈部16和凸缘18被保持在通道24的外侧,穿过下开口41。
[37]为了保持颈部16的温度低于其玻化过渡温度,鼓风机52将新鲜气流横向吹向颈部16。
[38]鼓风机52横向地位于图3中第二壁42的左边。
[39]根据本发明的教导,鼓风机包括两台分离的鼓风机,即上鼓风机54a和下鼓风机54b。在下文中,上风扇54a的组件的附图标记将跟随以字母“a”,下风扇54b的组件的附图标记将跟随以字母“b”。
[40]每一个风扇54a和54b主要包括电动机驱动的叶轮56a和56b,也称为涡轮,安装成围绕竖向轴B、竖向空气进入管58a,58b和横向切向空气输出或输送管60a,60b旋转。风扇54a和54b相对于水平中间平面整体对称,也就是说,叶轮56a和56b和输送管60a和60b相邻,而进入管58a和58b在相对的方向上定向。
[41]叶轮56a和56b安装成围绕同一竖向轴B旋转。它们各自由相连的电动机62a和62b通过轴64a,64b转动。此处电动机62a和62b竖向地设置在两个叶轮56a和56b之间。
[42]在本发明的一个可选实施例(未示)中,电动机62a和62b位于离风扇54a和54b一定距离处,它们通过传动机构例如带驱动轴64a和64b。从而,两个叶轮56a和56b可相互竖向地靠近,这样,鼓风机52就可以在高度方向上更加紧凑。
[43]空气进入管58a和58b竖向地沿叶轮56a和56b的轴B设置,一个与另一个相对。
[44]这样,上风扇54a的空气进入管58a竖向地延伸到叶轮56a的上方,以从鼓风机52上方获取空气向下进入叶轮56a。
[45]风扇54b的空气进入管58垂直延伸在所述叶轮56b的下方,从而吸进位于所述鼓风机52之下的空气至高处直至所述叶轮56b。
[46]输送管60a和60b横向于通道24定向,且相互邻近。
[47]在图3所示的示例中,它们形成在一个共同的输出箱66中,通过一个基本上位于两个风扇54a和54b的对称平面中的水平隔墙68,该输出箱被分成两个室,上室60a和下室60b。就图3而言,箱66的横向端70上游的第一室,位于左边叶轮56a和56b的出口处,而横向端72下游的第二室,包括开口,以允许气流从叶轮56a和56b横向地分别流入通道24和颈部16。
[48]从而,上室60a形成输送管,该输送管横向地从叶轮56a延伸至加热通道24的第二壁42。
[49]从而,下室60b形成输送管,该输送管横向地从下叶轮56b延伸进入预成型件10的颈部16的区域。
[50]有利地,电动机62a和62b被两个分离的控制单元控制。从而,可以通过作用在上风扇54a上而调控穿过第二壁42的气流,而不必改变冷却颈部16所需的气流。
[51]在鼓风机62的操作过程中,电动机62a和62b转动叶轮56a和56b,叶轮经轴向进入管58a和58b导入空气,如图3中箭头所示。
[52]上叶轮56a鼓风,从而,空气被导入上输送管60a。被输送的空气穿过第二壁42的孔50而渗透入通道24。
[53]下叶轮56b鼓风,从而,空气被导入下输送管60b。被输送的空气直接导向颈部16上以冷却颈部。
[54]根据本发明的一个可选实施例(未示),下风扇54b的进入管58b同轴地容纳在上风扇54a的进入管58a内侧。进入管的下游端部分向下延伸经过一个保留在上叶轮56a的中心的轴线中的竖向凹进处,从而,流经该中心的空气在被输送入下输送管60b之前被下叶轮56b导入。有利地,该构造形式防止了下风扇54b吸取可能在加热炉22下的物体,例如加热炉22下地板上的灰尘。
Claims (6)
1.加热炉(22),其用于加热预成型件(10)、尤其是塑料容器预成型件,所述加热炉包括一纵向加热通道(24),所述通道由两个壁(40,42)的相互平行的纵向竖立内表面(36,38)横向地限定,其中一第一加热壁(40)装配有一加热系统(46),而另一通风壁(42)具有通风孔(50),所述通风孔用于使由一鼓风机(52)吹出的空气从上游在所述加热通道(24)外侧向下游在加热通道内侧横向地通过,且在所述加热炉中,所述预成型件(10)的第一部分(12,14)在所述加热通道(24)中被加热,而所述预成型件(10)的第二部分(16)通过一纵向开口(41)被保持在所述加热通道(24)的外侧,所述纵向开口设置在所述加热通道(24)的壁(36,38)的纵向边缘之间,所述鼓风机(52)包括两台独立的风扇(54a,54b),所述风扇分别把空气横向地输送到所述通风壁(42)和所述预成型件(10)的所述第二部分(16),以保持所述预成型件(10)的所述第二部分(16)的组成材料的温度低于其软化点,
其特征在于,所述鼓风机(52)包括两个分开的相邻空气排放管(60a,60b),且每一空气排放管都连有一风扇(54a,54b)。
2.根据权利要求1所述的加热炉(22),其特征在于,所述排放管(60a,60b)由一具有隔墙(68)的共同的箱(66)的上室和下室形成。
3.根据上述权利要求中任一项所述的加热炉(22),其特征在于,所述鼓风机(52)包括两个分开的空气进入管(58a,58b),且每一空气排放管都与一风扇(54a,54b)相关联。
4.根据权利要求3所述的加热炉(22),其特征在于,所述鼓风机(52)包括两个同轴的竖向轴(64a,64b),每一轴驱动一台相连的风扇(54a,54b)。
5.根据上述权利要求中任一项所述的加热炉(22),其特征在于,与所述通风壁(42)相连的风扇(54a)所推动的气流速度由一控制装置操控。
6.根据上述权利要求中任一项所述的加热炉(22),其特征在于,所述风扇(54a,54b)由两个分开的控制单元控制。
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FR0351123A FR2863932B1 (fr) | 2003-12-19 | 2003-12-19 | Four de chauffage d'une preforme equipe de deux ventilateurs de refroidissement |
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EP (1) | EP1694493B1 (zh) |
JP (1) | JP4414438B2 (zh) |
KR (1) | KR20070003802A (zh) |
CN (1) | CN1898074A (zh) |
AT (1) | ATE376920T1 (zh) |
DE (1) | DE602004009827T2 (zh) |
ES (1) | ES2294570T3 (zh) |
FR (1) | FR2863932B1 (zh) |
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FR2913210B1 (fr) | 2007-03-02 | 2009-05-29 | Sidel Participations | Perfectionnements a la chauffe des matieres plastiques par rayonnement infrarouge |
FR2917005B1 (fr) | 2007-06-11 | 2009-08-28 | Sidel Participations | Installation de chauffage des corps de preformes pour le soufflage de recipients |
DE102009008318A1 (de) * | 2009-02-10 | 2010-08-12 | Krones Ag | Vorrichtung zum Erhitzen von Kunststoffvorformlingen |
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-
2003
- 2003-12-19 FR FR0351123A patent/FR2863932B1/fr not_active Expired - Fee Related
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2004
- 2004-12-17 JP JP2006544455A patent/JP4414438B2/ja not_active Expired - Fee Related
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- 2004-12-17 KR KR1020067012652A patent/KR20070003802A/ko not_active Application Discontinuation
- 2004-12-17 PT PT04804920T patent/PT1694493E/pt unknown
- 2004-12-17 CN CNA2004800381309A patent/CN1898074A/zh active Pending
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FR2863932A1 (fr) | 2005-06-24 |
ES2294570T3 (es) | 2008-04-01 |
DE602004009827T2 (de) | 2008-08-21 |
US7553156B2 (en) | 2009-06-30 |
PT1694493E (pt) | 2007-12-10 |
EP1694493B1 (fr) | 2007-10-31 |
US20070148272A1 (en) | 2007-06-28 |
WO2005065917A1 (fr) | 2005-07-21 |
ATE376920T1 (de) | 2007-11-15 |
KR20070003802A (ko) | 2007-01-05 |
FR2863932B1 (fr) | 2007-07-06 |
JP2007514571A (ja) | 2007-06-07 |
JP4414438B2 (ja) | 2010-02-10 |
EP1694493A1 (fr) | 2006-08-30 |
DE602004009827D1 (de) | 2007-12-13 |
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