CN101014459A - 用于焊接具有多重壁的管的加热板及其焊接方法 - Google Patents

用于焊接具有多重壁的管的加热板及其焊接方法 Download PDF

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CN101014459A
CN101014459A CNA200580030266XA CN200580030266A CN101014459A CN 101014459 A CN101014459 A CN 101014459A CN A200580030266X A CNA200580030266X A CN A200580030266XA CN 200580030266 A CN200580030266 A CN 200580030266A CN 101014459 A CN101014459 A CN 101014459A
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pipe
heating plate
depression
walled pipes
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CN101014459B (zh
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柳德熙
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Li Purong
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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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • 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
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/116—Single bevelled joints, i.e. one of the parts to be joined being bevelled in the joint area
    • B29C66/1162—Single bevel to bevel joints, e.g. mitre joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/725—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being hollow-walled or honeycombs
    • B29C66/7252—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being hollow-walled or honeycombs hollow-walled
    • B29C66/72523—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being hollow-walled or honeycombs hollow-walled multi-channelled or multi-tubular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167—Quick change joining tools or surfaces
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/841—Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions
    • B29C66/8414—Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions of different diameter
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91212—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C67/0044—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for shaping edges or extremities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/02—Welded joints; Adhesive joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract

本发明公开了一种装置和方法，其防止水泄漏到多壁管的外部，或管壁内的空心部分，并强制性校正位于接头的相反端上的管之间的内径和外径差异，同时校正管的圆度。加热板包括圆盘、位于圆盘一侧的外表面上并具有底部平坦的V形横截面的圆形凹槽以及***圆盘中的热源。接合多壁管的方法包括：将切割后的多壁管的一端***加热板的V形凹槽中；通过将电施加到加热板上而加热和熔化切割后的多壁管的该端；在取走加热板之后压缩和冷却切割后的多壁管。

Description

用于焊接具有多重壁的管的加热板及其焊接方法
技术领域
本发明涉及一种装置和方法，其能够防止水泄漏到多壁管(包括双壁管)的外部，或螺旋管的管壁内的空心部分，并强制校正位于接头相反端上的管之间的内径和外径差异，同时校正管的圆度。
背景技术
在用于下水管的聚乙烯(PE)管中，经常使用多壁管，例如螺旋双壁管、螺旋三壁管或螺旋PE双壁实心管。由于这种螺旋双壁管被切割成预定的长度，因此在施工过程中必须将切割端接合起来。
在用于下水管的PE双壁管的情况下，与城市燃气管或自来水管(其由相同的材料制成)不同，还没有为管道制造和接合方法制定明确的国家标准。即使生产具有相同管径的产品，由不同制造公司生产的产品的内径和外径有很大的不同。因此，难以通过对接的方法将几个公司生产的产品接合起来。
即使产品是在相同的工厂制造的，根据制造条件(冷却过程中的温度)，产品的直径可能会有很大的不同，这是由产品的材料特性所致。表1显示了韩国塑料标准(KPS M2009)中规定的密封套管的尺寸和公差。
[表1]B型密封套管的尺寸和公差(单位：mm)
平均内径   平均内径公差     最小管壁厚度  钟形部分最小厚度 长度(m)
  第一类   第二类
    100     ±4.0     5.1 4或6
    125     ±4.0     5.5
    150     ±4.5     5.9
    200     ±5.1     14     12     7.4
    250     ±5.1     15     14     8.4
    300     ±5.1     19     14     9.1
    350     ±5.1     22     15     10.7
    400     ±5.1     25     19     12.7
    450     ±5.1     29     22     12.7
    500     ±5.1     31     25     12.7
    600     ±5.1     39     31     12.7
如表1所示，用作下水管的管的直径一般为200～60mm，并且管的平均内径的公差为±5.1mm。就实际生产出的管而言，管可能不完全是圆形的。因此，通过对接焊接法将各个管接合在一起时，最大的差异可达10.2mm或更多。
而且，由于双壁管是一种螺旋管，因此切割端的形状不恒定，即使管是垂直切割的。也就是说，切割部分的形状可能有变化，如图1所示。如图1a和1b所示切割双壁管时，存在实心部分，因而使各个管可以轻松接合在一起。但是，如图1c切割双壁管时，会形成孔。在这种情况下，具有孔的端部无法令人满意地使用一般的对接焊接法相互接合在一起。
为了解决这个问题并满足规定的公差，已开发出了各种技术。
到目前为止，韩国广泛采用各种PE管接合方法。例如，已经提出了PE套管管座接合法、PE圆形管座接合法、不锈钢带管座接合法、电熔薄板接合法、法兰接合法、密封双壁接合法等，其可以由PE管制造商和下水道联接公司命名为略微不同的名称。
但是，如果所构造的管被长时间使用，目前所用的所有构造方法都会引起土地下陷，因此这些方法无法提供可靠的耐用性。而且，不确定这些构造方法是否满足韩国塑料标准(KPS M2009)中规定的接头不透水性测试要求。根据接头不透水性测试要求，将管的两端密封起来并用水或燃气填充管时，管必须保持0.75kgf/cm2的压力达10分钟，并且管的内部压力不能变成超过0.17kgf/cm2。
下面将参照图2简要说明目前使用的构造方法。
图2a显示了作为目前广泛使用的各种方法之一的电熔接合法。根据这种方法，将薄板2放在双壁管1的外表面上，以将管1接合起来。但是，这种方法的问题是，必须使用附加的管接合部件，例如熔化薄板、不锈钢带或热收缩套管，从而增加了其构造的复杂性。
而且，电熔接合法的问题在于，即使使用抗腐蚀材料将各个管接合在一起，也无法防止由腐蚀引起的泄漏。因为这些管只在其外表面接合在一起，因此泄漏可能频繁发生。这种方法的所有过程都是手动执行，从而无法实现该方法的自动化。
图2b显示了法兰接合法，其中，使用螺栓和螺母将法兰3紧固到双壁管1的端部，因而将各个管接合在一起。法兰接合法的问题在于，通过将一个单层管与多个双壁管熔合而将这些双壁管接合在一起，因此通过这种方法生产的下水管很贵，并且如果使用螺栓和螺母来紧固法兰3，则可能因腐蚀而发生泄漏。
图2c显示了密封双壁对接法。为了实现对接，将填料4装入各个管的接合部分之间。这种方法提供了极好的不透水性、强度和耐用性。但是，这种方法的问题在于下水管很贵。
图2d显示了热熔法。根据这种方法，制造加热板5，以强制性校正管径的差异，并使接合的表面形成实心壁。但是，当管径之间的差异很大时，会在两个管之间产生台阶。存在于管中的这种台阶会引起透过双壁中的空心部分的泄漏。因此，即使水***漏到管外部，管也会在冬天结冰并爆裂。而且，如果管与完全圆度相差很大，则无法将管接合起来。
发明内容
技术问题
因此，为了解决现有技术中出现的上述问题而提出了本发明，并且本发明的一个目的是提供一种装置和方法，其能够防止水泄漏到多壁管(包括双壁管)的外部，或螺旋管的管壁内的空心部分，并强制校正位于接头相反端上的管之间的内径和外径差异，同时校正管的圆度。本发明的另一个目的是提供一种装置和方法，其在加热板上制作适当的凹槽，从而防止由于每个多壁管的尺寸变化而引起的各个管的不对齐，并且增加接合端的厚度，从而增加接合强度。
技术方案
为了达到这些目的，本发明提供了一种用于接合多壁管的加热板，包括圆形或环形板，在该板的每一侧的外表面提供圆形凹槽，其具有底部平坦的V形横截面，并将热源***板中。
而且，本发明提供了具有带台阶的V形凹槽的加热板。
而且，本发明提供了具有双排式V形凹槽的加热板，以将双壁管的切割端***凹槽中。
而且，本发明提供了一种使用加热板将多壁管接合起来的方法，包括以下步骤：将切割后的多壁管的一端***加热板的V形凹槽中以将多壁管接合起来，通过将电施加在加热板上而加热和熔化切割后的多壁管的该端，并且在取走加热板之后压缩和冷却切割后的多壁管。
有利效果
根据本发明，多壁管的切割端精确地对应于加热板的凹槽，从而防止因管的尺寸变化而引起的不对齐，并且增加接合表面的面积，从而增加接合强度。
附图说明
图1是显示螺旋双壁管的切割端的视图；
图2说明了将双壁管接合起来的传统方法；
图3是根据本发明的实施例用于接合多壁管的加热板的透视图；
图4是根据本发明的另一实施例的加热板的示意图；
图5说明了本发明的V形凹槽的实施例；
图6是显示图4的加热板已组装好的状态的剖视图；
图7是显示使用本发明的装置将多壁管接合起来的方法的照片。
具体实施方式
下面将参照附图详细说明本发明。
图3是显示根据本发明的实施例的装置的透视图。
本发明的加热板10包括具有圆盘形或环形的主体11。在主体11上形成具有V形横截面以及平坦底部的圆形凹槽12。在主体11的两侧提供了钩部13，将其钩到管对齐装置的支轴上。
为了减轻加热板10的重量，使用铝合金来制造加热板10。加热板10的外表面可以涂有特氟纶，以防止聚乙烯或杂质粘在加热板10上。
将热源***主体11中。将与用于加热热源的电源相连的电源线14连接到主体11上。而且，在主体11上的预定位置提供热电偶15，其检测加热板10的温度。将热电偶15连接到温度控制器(未示出)，从而自动控制加热板10的温度。
为了容易处理温度控制器(未示出)，更优选地是将热电偶***加热板中并整体提供于加热板的上部。
根据图3的实施例，主体11包括两个薄板，以便将热源***主体11中。通过将螺栓和螺母紧固到螺栓孔16中而将主体11的薄板相互耦合起来，从而提供加热板。
而且，根据另一实施例，更优选地是以铸造的形式来生产内有热源的主体11，并且随后在主体的外表面上形成V形凹槽。
图4a显示了根据本发明的另一实施例的装置的外表面，而图4b显示了该装置的内部。
如图4a所示，在主体上形成两种凹槽，即用于较大直径管的凹槽21以及用于较小直径管的凹槽22。而且，如图4b所示，在加热板20中安装热源23，以加热用于较大直径管的凹槽，并且在加热板20中安装另一个热源24，以加热用于较小直径管的凹槽。优选地将具有适当容量的管式加热器用作热源，但不限于具体的热源。
一般较大直径的管具有300mm的直径，而一般较小直径的管具有200mm的直径。
图5说明了本发明的V形凹槽的实施例。
图5a是显示具有平坦底部的V形凹槽31的视图。具有凹槽的加热板熔化并填充PE管的管壁的空心部分，从而使各个管可以轻松接合在一起。
图5b显示了底部平坦但具有台阶的V形凹槽33。与具有凹槽31的加热板类似，具有凹槽33的加热板熔化并填充管壁的空心部分，从而使各个管可以接合在一起。与具有凹槽31的加热板相比，这提供了更可靠的填充。
图5c显示了底部平坦并包括两排的V形凹槽34。这适合将管壁接合在一起，而不必填充切割端。
图5d显示了将三壁管接合在一起的方法。在图5d中，使用具有V形凹槽31(其与图5a相同)的加热板将三壁管36焊接在一起。
图6是显示图4的加热板已组装好的状态的剖视图。
将较大直径的双壁管25***加热板20的V形凹槽21中，并且在加热板20中提供了热源23和24。
下面将参照附图说明使用本发明的加热板来接合多壁管的过程。
图7是显示使用本发明的装置将多壁管接合起来的方法的照片。
接合过程包括：管对齐步骤；加热板***步骤；压缩和熔化步骤；热保持步骤；加热板取走步骤；压缩和冷却步骤。
图7a显示了使用一般管对齐装置来对齐管的状态，图7b显示了***加热板以及压缩和熔化管的状态，而图7c显示了压缩和冷却熔化管的状态。
用于熔化PE管的最佳温度是210℃左右，并且用于熔化PE管的最佳压力是1.5kg/cm2。加热时间根据管径的大小而变化。最好是加热PE管，直到熔化的PE管在管的外部形成2～3mm的熔珠为止。

Claims (4)

1.一种用于接合多壁管的加热板，其包括：
圆形或环形板；
圆形凹槽，其位于所述板的每一侧的外表面上，并具有底部平坦的V形横截面；
以及热源，其***所述板中。
2.如权利要求1所述的加热板，其中，所述V形凹槽包括具有台阶的V形凹槽(33)。
3.如权利要求1所述的加热板，其中，所述V形凹槽包括双排式V形凹槽(34)，以便将双壁管的切割端***凹槽。
4.一种使用加热板来接合多壁管的方法，其包括以下步骤：
将切割后的多壁管的一端***加热板的V形凹槽，以接合如权利要求1至3项中任何一项所述的多壁管；
通过将电施加于加热板上而加热和熔化切割后的多壁管的所述端；以及在取走加热板之后，压缩和冷却切割后的多壁管。
CN200580030266XA 2004-08-05 2005-08-04 用于焊接具有多重壁的管的加热板及其焊接方法 Expired - Fee Related CN101014459B (zh)

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