CN1044253A - 热塑管成型装置的冷却塞或与塞有关方面的改进 - Google Patents
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Abstract
本发明涉及模压热塑管的装置。该装置可以是模压单平壁管的装置,或者是为模压波纹管、肋式管或各种其它形状(包括各种类型的双壁管)的装置。为精压管内径的塞带有将负压加到管的内部直径的装置,为的是平滑管的内壁并使管的成型更快。该塞还作冷却塞使用,还可设有联通负压到冷却液体以便将液体吸到塞的表面的装置,对进一步加速管的形成过程提供润滑。
Description
本发明涉及模压热塑管的装置,它使用了一个精压塞来限制管的内径。本发明对于生产肋式管或双壁管尤其有效。
本装置是这样的类型,热塑材料在制管过程中被连续挤压入环绕心轴的移动管形模压通道,通过心轴下游的精压塞挤压成管的形状。有时,当压出物不易流满模具时,上述寒可被加热,从而增加了压出物的流动性(例如在来自凹进部分底层吸力的影响之下),使其易于流入模具的凹进部分。然而,更一般的情况是提供充分溶触状态下的压出物以流满模具。因此需要设置精压塞以限制管的内壁,以便把压出物限定在一个合适的铸塑腔中。
1982年12月28日公布的专利号为4,365,948的美国专利中,查普林(Chaplain)提出了一种限制管内壁的简单的精压塞。通常希望对精压塞进行某种温度控制。在1985年10月8日公布的专利号为4,545,751的美国专利中,鲁伯克(Lupke)描述了一种更复杂的装置。在这一装置中,精压塞并不限定管的内壁,但是用来分配空气进入波纹管的内部。加压空气是通过与挤压喷口同心的中心部分传输的。周围的热空气被吸出,中央的冷空气离开该塞来与波纹管的内部接触,该塞向内与管内壁隔开。这种安排适合用于生产波纹管,但是冷却温度的范围有限。这种安排对于生产肋式管不太适合,因为这时该塞将是与管的内壁相接触的塞,
从而限制它进入铸塑区。在这种情况下,在塞壁和管内壁之间冷却空气不能被卸压。1985年11月26日公布的鲁伯克(Lupke)后来申请的美国专利中(专利号为4,555,230)公开了一种适于形成肋式管的冷却塞。在这一专利中,鲁伯克并没有使用卸压的冷却空气,但是在接近随动塞的表面和内部,设置了一个螺旋盘管,冷却流体可以通过该盘管。
除了进入模具的型坯,生产无肋或无波纹的单平壁管的装置还包括其温度可以通过使用水套来调节。不用精压塞来形成管的内表面,但是可用气体压力或类似方法将管压向外模具。由于一些变化的因素,比如管在凝固时不均匀的收缩,所形成的管的内壁可能不完全均匀。然而,其优点是可以高速生产这种管子。
还是这位发明人于1988年12月20在加拿大申请的专利(申请号为586,828)中公开了一种冷却塞,塞的冷却是通过进入塞中的气体的等熵膨胀来进行的。这样做有很多优点,可将冷却液体输送到塞,冷却程度可控制。但是,该专利申请并没有谈到在管内壁上的有规律的凸起和压痕问题。
在成形管中精压塞用来使管的内壁平滑,但是,在成形肋式管时,要得到平滑的内壁会遇到一些问题。原因由于肋处和凹处不同的壁厚,对于热塑材料需求量不同,因此,形成肋处的管壁比在两肋之间的管壁部分(凹处)所需要的塑料材料多。由于塑料材料要作变化,装置上模压块上的填注部位便产生应力。此外,在管子厚度变化处,比如在肋处和凹处,收缩时就会产生不均匀情况。
同一申请人于1988年9月16日的加拿大专利申请(申请号为577,653)中描述了在模具的塑料材料填充处使用一个储存
室。该室的目的是使压力变化和应力减小。为此目的使用储存室是十分有用的,但是在管的内壁中仍有一些压力变化。
这样,在管的内壁会形成小的波状层,在肋之间的压出物压力较大,内壁会向内凸出,而对着肋的地方压出物压力较小,内壁会形成凹处。当不使用储存室时,这种影响便增强了。
当生产双壁波纹管时,由于压力是在波纹内,因此还会碰到困难。如果压力过低,内壁会弯向波纹形成不希望的凹处。如果压力太高,内壁则从波纹向外弯曲形成不希望的凸处。
本发明的目的是改善模压成型的热塑料管内壁的平滑度,特别是外表面带有肋的管。
按照本发明,为成形无缝热塑管提供的装置有,
为形成管的内壁的精压室;
负压源;
上述负压的管路装置在上述塞中延伸,它又与上述塞的管的精压表面联通,这样,负压可加到成形的管的内壁。
本发明还提供了成形无缝热塑管内壁的方法,包括通过精压塞装置在成形的管内精压内壁,在上述室中,通过负压联通装置把负压加到成形的管的内壁,从而对管的内壁施加负压。塞的精压表面上最好有一条槽或数条槽,将负压布遍其表面。
本发明的方法和装置特别适合于应用在移动模具的管子模压装置上,特别是当该装置用于成形肋式管或双壁波纹管时。因为当用普通设备生产这类管子时,由于沿着模具的压出物需求量不同,结果使这种管的内壁缺陷更为显著。本发明的装置和方法同样适于克服平壁管内壁出现的缺陷。
加在精压塞表面的负压可以用来吸收冷却水或其它液体,从塞的内部,通过设置的一些孔把冷却剂送至管精压表面上。这样的水或其它液体在成形的管的内壁和塞之间的接触面上起到润滑或其它的目的。
下面参照附图对本发明的实施例予以说明。
图1为本发明装置的挤压喷口的剖视图,该装置在一个移动的模压通道中模压热塑管,图中显示了按照本发明的模压通道的一部分和一个冷却塞;
图2为挤压装置的部分剖视图,该装置包括按照本发明的精压塞,该装置用来成形单平壁管;
图3为图1中的冷却塞的视图;
图4为按现有技术生产的管材轴向剖开的简图,图中显示不平整的内壁;
图5是与图4相似的简图,但具有所要求的内壁的形状。
参照附图,特别是图1,本装置包括一对互补的上下模压部件,每一模压部件又包括相互铰接的模压块16。
模压块16可以模压各种所要求的管材。例如,模压块16可以模压环形肋管或螺旋形肋管,双壁管或其它形状管材。然而,人们希望管的内壁要平滑。
模压部件可操作地定位于挤压头23,以便与挤压机喷口可操作地匹配。挤压机可以是通用型。如果需要的话,模压部件也可以从挤压头23移开,便于人们对它进行维修或其它工作。
挤压头23包括一个轴向延伸的管状部分26,该管状部分由管状件27所环绕,两者之间留有空间。管状件27的一个端部螺纹联接着环形挤压喷口24的一个外部件28。管状部分26带有挤压喷
口的一个内部件29,它具有截头锥体的形状,并终于环形孔31,该孔与管27和部分26之间的环形空间32联通。环形空间32又与挤压机的输出部(未示出)相联通,这样就可以使热塑材料(例如聚氯乙烯)到达挤压喷口24。
在挤压喷口24的下游,挤压头23在管状部分26的延伸部带有一个大体上为圆柱状的精压塞46。该塞46有效地确定了正在离开挤压喷口24而被模压块16所模压而成的管的内壁。特别是塞46将热塑材料留滞在极压块16的凹处36中,从而使成品的管子外表面形成环形肋。
塞46的冷却可通过压缩的气体,例如二氧化碳(正如上面描述过的加拿大专利申请,申请号为586,528,申请日为1988年12月20日)的等熵膨胀。或者用其他常规方法对塞46进行冷却,例如,来自管路20的冷却水通过在塞46内部配置的、并在塞长度上延伸的通道25。返回的冷却水可以通过管路21,或者通过管状件26的中心部分53。塞46的冷却的布置并不构成本发明的一部分,这样的冷却布置可以有很多方案,使之尽可能的简单。冷却的布置也可以通过任何合宜的回流管路来完成。
冷却塞46一般包括联接在内部件29一端的芯部45,芯部45的外表面有通道25,可以使冷却液体(例如水)通过。芯部45有一轴向孔,它与挤压头23的延伸孔53相通。通道25可以是螺旋形或其它任何合宜的形状。芯部45由套筒47包裹,以便将冷却水限制在通道25中。套筒47的外表面总的来说是光滑的,以便使模具中管子的内壁得到精压。在套筒47带有一条或数条通道28以便把负压布遍在套筒47的外表面。图3中介绍了通道28为
一种螺旋通道的形式,它的横截面比冷却通道25的横截面要小。事实上,通道25的宽度只有0.01英寸那么窄。其它形状的通道也是可能的。通道28通过管路38与一单独的负压源(未显示)联通,管路38通入通道28和负压入口39。管路38可以分路或不分路,这样负压可沿塞46加在各处。当它被分路时,在这种情况下每一分路将通向多个类似28的通道。每一条通道28最好位于应用负压的下游冷却开始的那一点,从而避免热塑材料被吸入通道28中。当在塞46的下游端应用负压而管路38又没有分路,负压在强度上的减少是逐渐向着上游端的。
在冷却液体通道25(或在冷却塞中的其它液体存储器)与塞46的外表面之间设立小的联通通道30是有利的。通过通道28,用负压将少量的液体吸到塞的外面,从而对管壁起到可能的润滑和/或平滑的作用。润滑也可以利用像在前面所述的加拿大专利申请(申请号为586,528所描述的塞46的多孔的前部分来完成。当环形肋管(如加拿大专利申请,申请号为577,653,申请日为1988年9月16日)中所描述的那样被成形时,如果管路38与紧挨在储存室的下游的通道28储存室开通是适宜的。
在常规操作中,内壁被成形的趋势正如图3中放大的简图所示。当负压应用到管的内壁时,可以减轻管的每一条肋所对着的形成的压痕37,这一点对于塑料易于流动的上游更为有效。
当使用如简图2中所示的常规单平壁管的成型装置时,管50的冷却(从挤压头51到围绕精压塞52)常常通过冷却套53来完成。在这种情况下,通过管路54和表面通道55将负压加于精压塞52。在负压应用的地方,管路54可以不分路,或如图所示分为两
分路,或更多的分路,正如参阅图1所讨论的那样。塞52一般设有液体通道57,作冷却塞使用,通道57为让来自管路56的冷却液体通过。在这种情况下,正如上面说过的,通过类似于通道30的小的负压通道58,冷却液体被吸到表面,以便作为润滑剂或其它目的。
生产单平壁管的内部冷却的精压塞的装置或其它常规装置,在模型无须包含水套(例如水套53)。
也可以用简单的没有冷却的模型代替。在某些情况下,外模型可以完全免去冷却。
Claims (7)
1、成形无缝热塑管的装置,包括成形管内壁的精压塞,负压源;在上述塞内延伸的上述负压的管路装置还与上述塞的管精压表面至少一个负压口相联通,从而可以使负压加到成形的管的内壁。
2、如权利要求1所述的装置,其特征在于,至少一个为分配负压的负压分配通道设置在塞纵向开口的表面。
3、如权利要求1所述的移动模具型装置。
4、如权利要求3所述的装置,其特征在于塞是一个冷却塞。
5、如权利要求4所述的装置,其特征在于,塞包括冷却装置,所述的冷却装置至少部分在上述负压口的上游。
6、如权利要求1所述的装置,其特征在于,管路装置分路以通向沿塞长度方向间置的多个负压孔。
7、如权利要求1所述的装置,其特征在于,塞包括一个液体通道或储存室。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA588,338 | 1989-01-16 | ||
CA000588338A CA1312717C (en) | 1989-01-16 | 1989-01-16 | Cooling plugs in thermoplastic pipe forming apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
CN1044253A true CN1044253A (zh) | 1990-08-01 |
CN1029671C CN1029671C (zh) | 1995-09-06 |
Family
ID=4139457
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN90100219A Expired - Lifetime CN1029671C (zh) | 1989-01-16 | 1990-01-16 | 成型无缝热型管的装置 |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0381938B1 (zh) |
JP (1) | JP2931007B2 (zh) |
KR (1) | KR930004048B1 (zh) |
CN (1) | CN1029671C (zh) |
CA (1) | CA1312717C (zh) |
DE (1) | DE69003829T2 (zh) |
FI (1) | FI900210A0 (zh) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4111229A1 (de) * | 1991-04-08 | 1992-10-15 | Wilhelm Hegler | Vorrichtung zur herstellung von kunststoff-rohren |
GB9112997D0 (en) * | 1991-06-17 | 1991-08-07 | Lupke Manfred Arno Alfred | Extrusion die with interchangeable extrusion nozzles |
US5489201A (en) * | 1993-04-15 | 1996-02-06 | Cullom Machine Tool & Die, Inc. | Plastic tile corrugator and mold blocks |
US5513975A (en) * | 1994-04-07 | 1996-05-07 | Advanced Drainage Systems, Inc. | Pipe extrusion die head manifold assembly |
DE4414977A1 (de) * | 1994-04-29 | 1995-11-02 | Wilhelm Hegler | Vorrichtung zur Herstellung von Rohren aus thermoplastischem Kunststoff mit Querprofilierung |
DE10225582B4 (de) * | 2002-06-10 | 2016-10-27 | Manfred Arno Alfred Lupke | Verfahren und Vorrichtung zur Herstellung eines doppelwandigen Rohres aus thermoplastischem Kunststoff mit einer Rohrmuffe |
JP2013212615A (ja) * | 2012-03-30 | 2013-10-17 | Sekisui Chem Co Ltd | 押出成形装置 |
CN104260318A (zh) * | 2014-08-12 | 2015-01-07 | 重庆阮氏塑业有限公司 | 改善pe实壁管道内外壁粗糙度的方法 |
CN104608368A (zh) * | 2015-01-27 | 2015-05-13 | 东阳市沃特塑胶有限公司 | 一种医用波纹管自动调节螺距成型模具 |
TR201614668A2 (zh) * | 2016-10-18 | 2018-04-24 | Canlar Boru Profil Plastik Elekt Ins Mak Nak Sanayi Ve Ticaret Ltd Sirketi | |
CN106738774A (zh) * | 2016-12-31 | 2017-05-31 | 剑河县连光复合塑料水管有限公司 | 双层复合管挤塑模具 |
CN110757854B (zh) * | 2019-11-01 | 2021-05-25 | 重庆市一龙管道有限公司 | Pe双壁波纹管加工设备 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS587448B2 (ja) * | 1974-09-25 | 1983-02-09 | 積水化学工業株式会社 | アツニクブト ウスニクブトオ コウゴ ニユウスル ジユシカンノ セイゾウホウホウ |
US4377545A (en) * | 1981-06-16 | 1983-03-22 | Borg-Warner Chemicals, Inc. | Method of making corrugated reinforced thermoplastic pipe |
JPS612524A (ja) * | 1984-06-15 | 1986-01-08 | Sekisui Chem Co Ltd | 熱可塑性樹脂管の製造方法 |
US4712993A (en) * | 1986-03-25 | 1987-12-15 | Lupke Manfred Arno Alfred | Extrusion die for externally ribbed plastic tubing |
-
1989
- 1989-01-16 CA CA000588338A patent/CA1312717C/en not_active Expired - Lifetime
-
1990
- 1990-01-12 EP EP90100576A patent/EP0381938B1/en not_active Revoked
- 1990-01-12 DE DE90100576T patent/DE69003829T2/de not_active Revoked
- 1990-01-15 FI FI900210A patent/FI900210A0/fi not_active IP Right Cessation
- 1990-01-16 CN CN90100219A patent/CN1029671C/zh not_active Expired - Lifetime
- 1990-01-16 KR KR1019900000486A patent/KR930004048B1/ko not_active IP Right Cessation
- 1990-01-16 JP JP2007012A patent/JP2931007B2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CN1029671C (zh) | 1995-09-06 |
EP0381938B1 (en) | 1993-10-13 |
KR930004048B1 (ko) | 1993-05-19 |
CA1312717C (en) | 1993-01-19 |
FI900210A0 (fi) | 1990-01-15 |
DE69003829D1 (de) | 1993-11-18 |
DE69003829T2 (de) | 1994-05-11 |
EP0381938A1 (en) | 1990-08-16 |
JP2931007B2 (ja) | 1999-08-09 |
KR900011559A (ko) | 1990-08-01 |
JPH02289326A (ja) | 1990-11-29 |
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C14 | Grant of patent or utility model | ||
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C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
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Granted publication date: 19950906 |