SU1502398A1 - Electric heater for resistance welding of pipes from thermoplastic materials - Google Patents

Electric heater for resistance welding of pipes from thermoplastic materials Download PDF

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Publication number
SU1502398A1
SU1502398A1 SU874254471A SU4254471A SU1502398A1 SU 1502398 A1 SU1502398 A1 SU 1502398A1 SU 874254471 A SU874254471 A SU 874254471A SU 4254471 A SU4254471 A SU 4254471A SU 1502398 A1 SU1502398 A1 SU 1502398A1
Authority
SU
USSR - Soviet Union
Prior art keywords
electric heater
power supply
disks
pipes
contact
Prior art date
Application number
SU874254471A
Other languages
Russian (ru)
Inventor
Иван Иванович Андреев
Иван Сергеевич Красников
Самуил Саневич Бруфман
Original Assignee
Трест "Союзпроммонтаж"
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Application filed by Трест "Союзпроммонтаж" filed Critical Трест "Союзпроммонтаж"
Priority to SU874254471A priority Critical patent/SU1502398A1/en
Application granted granted Critical
Publication of SU1502398A1 publication Critical patent/SU1502398A1/en

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Classifications

    • 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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • 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"
    • B29C65/2007—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" characterised by the type of welding mirror
    • B29C65/2015—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" characterised by the type of welding mirror being a single welding mirror comprising several separate heating surfaces in different planes, e.g. said heating surfaces having different temperatures
    • 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
    • B29C65/24—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
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B29C66/0044—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined using a separating sheet, e.g. fixed on 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
    • B29C66/01—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
    • 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
    • B29C66/50—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
    • 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
    • B29C66/70—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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • 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
    • B29C66/861—Hand-held tools
    • 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
    • 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
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

Изобретение относитс  к сварке пластмасс, а именно к устройствам дл  стыковой контактной сварки труб из термопластов. Цель изобретени  - повышение качества сварного соединени  и экономии электроэнергии. Дл  этого электронагреватель дл  контактной сварки труб из термопластов снабжен биметаллическим температурным реле. Первый контакт реле соединен с первой шиной источника питани , второй контакт - с второй шиной источника питани  через нагревательный элемент, размещенный во внутреннем концентричном пазу дисков. Перва  шина источника питани  соединена с второй его шиной через нагревательный элемент, размещенный во внешнем концентричном пазу дисков. Кроме того, электронагреватель снабжен ручкой из материала с низкой теплопроводностью, закрепленной на дисках посредством двух стоек. На одной из стоек расположено биметаллическое температурное реле, а на другой - выводы нагревательных элементов. 1 з.п. ф-лы, 2 ил.The invention relates to the welding of plastics, in particular to devices for butt contact welding of pipes of thermoplastics. The purpose of the invention is to improve the quality of the welded joint and save energy. To this end, the electrical resistance heater for thermoplastic pipes is equipped with a bimetallic temperature switch. The first contact of the relay is connected to the first power supply bus, the second contact to the second power supply bus via a heating element placed in the inner concentric groove of the disks. The first power supply bus is connected to its second bus through a heating element placed in the outer concentric slot of the disks. In addition, the electric heater is equipped with a handle made of a material with low thermal conductivity, mounted on the disks by means of two racks. On one of the racks there is a bimetallic temperature relay, and on the other - the conclusions of the heating elements. 1 hp f-ly, 2 ill.

Description

Изобретение относитс  к области сварки пластмасс, а именно к устройствам дл  стыковой контактной сварки труб из термопластов.The invention relates to the field of welding plastics, namely to devices for butt contact welding of pipes from thermoplastics.

Цель изобретени  - повышение качества сварного соединени  и экономи  электроэнергии.The purpose of the invention is to improve the quality of the welded joint and save energy.

На фиг. 1 изображен э/гектронагре- ватель, вид спереди} на фиг. 2 - то же, вид .сбоку.FIG. 1 shows an electric heater, front view} in FIG. 2 - the same, side view.

Электронагреватель дл  контактной сварки труб из термопластов содержит два диска 1 толщиной 10 мм каждый . На рабочих поверхност х дисков вьтолнены концентричные пазы 2 и радиальные пазы 3, в которых установлены керамические изол торы 4.An electric heater for contact welding of pipes of thermoplastics contains two discs 1 with a thickness of 10 mm each. Concentric grooves 2 and radial grooves 3, in which ceramic insulators 4 are mounted, are made on the working surfaces of the disks.

В керамических изол торах 4 внутреннего концентричного паза расположен нагревательный элемент 5, а в керамических изол торах внешнего концентричного паза - нагревательный элемент 6. Нагревательные элементы вьшолнены в виде нихромовых спиралей , выводы 7 которых размещены в радиальных пазах 3 и св заны с элек- троподвод щими шинами 8 и 9 источника питани  (не показан).In the ceramic insulators 4 of the inner concentric groove there is a heating element 5, and in the ceramic insulators of the outer concentric groove there is a heating element 6. The heating elements are made in the form of nichrome spirals, conclusions 7 of which are placed in the radial grooves 3 and connected to the electrically conductive 8 and 9 power supply tires (not shown).

На дисках 1 электронагревател  закреплена ручка 10 при помощи двух стоек 11, вьшолненна  из материала с низкой теплопроводностью. На одной из стоек 11 расположено биметаллическое температурное реле 12, а наOn the disks 1 electric heater fixed handle 10 with the help of two racks 11, made of a material with low thermal conductivity. On one of the racks 11 there is a bimetallic temperature relay 12, and on

другой - выводы 7 нагревательных элементов и шины 8 и 9 источника питани . Первый контакт 13 биметаллического температурного реле 12 соединен с первой шиной 8 источника питани , а второй контакт 14 реле 12 - с второй шиной 9 источника питани  через нагревательный элемент 5, размещенный во внутреннем концентричном пазу 2 дисков.the other is the terminals 7 of the heating elements and the tires 8 and 9 of the power supply. The first contact 13 of the bimetallic temperature relay 12 is connected to the first power supply bus 8, and the second contact 14 of the relay 12 to the second power supply bus 9 via a heating element 5 placed in the inner concentric slot 2 of the disks.

Перва  шина 8 источника питани  соединена с второй его шиной 9 через нагревательный элемент 6, размещенный во внешнем концентричном пазу дисков.The first power supply line 8 is connected to its second tire 9 via a heating element 6 located in the outer concentric groove of the disks.

На рабочей поверхности каждого диска 1 при помощи кольца 15 закреплена фторопластова  пленка 16 в виду кр-уга.On the working surface of each disk 1 by means of a ring 15 the fluoroplastic film 16 is fixed in the form of cr-agar.

Внутренний концентричный нагревательный элемент 5 имеет сопротивление , которое обеспечивает при посто нном напр жении выделение тепловой мощности пор дка 40% от общей мощности электронагревател . На один сантиметр длины внешнего концентричного нагревательного элемента 6 поступает мощность пор дка 6-7 Вт, а у внутреннего концентричного нагревательного элемента она составл ет 4-5 Вт. При таком соотношении мощностей внутренний нагревательный элемент 5 выполн ет вспомогательную роль и поддерживает необходимую температуру в области подогрева трубы основным внешним нагревательным элементом 6. Потер  тепла по толщине дисков 1 поддерживаетс  и регулируетс  избытком мощности внутреннего нагревательного элемента 5. Так, например , при диаметре трубы 20 см и толщине стенки пор дка 1 см диаметр диска составл ет 26 см. Диаметр внешнего концентричного нагревательного элемента 6-21 см, его сопротивление 9,75 Ок. Диаметр внутреннего концентричного нагревательного элемента 5-17 см, его сопротивление Internal concentric heating element 5 has a resistance which, at a constant voltage, provides heat output in the order of 40% of the total power of the electric heater. One centimeter of the length of the outer concentric heating element 6 receives power in the order of 6-7 watts, while for the inner concentric heating element it is 4-5 watts. With this power ratio, the internal heating element 5 plays an auxiliary role and maintains the required temperature in the heating area of the pipe by the main external heating element 6. The heat loss across the thickness of the disks 1 is maintained and regulated by the excess power of the internal heating element 5. For example, at a pipe diameter of 20 cm and a wall thickness of about 1 cm. The diameter of the disc is 26 cm. The diameter of the outer concentric heating element is 6-21 cm, its resistance is 9.75 Ok. The diameter of the inner concentric heating element 5-17 cm, its resistance

19,5 Ом. Напр жение питани  электронагревател  65 В. Колебани  напр жени  допускаютс  в пределах 5-10 процентов . Диски 1 электронагревател  изготовлены из легкого металла с высокой теплопроводностью, например алюмини . Диаметр диска 1 превьппает диаметр свариваемой трубы на 30- 40 мм. Диаметр внешнего концентричного паза 2 несколько больше (на19.5 ohms. The supply voltage of the electric heater is 65 V. The voltage fluctuations are allowed in the range of 5-10 percent. The electric heater discs 1 are made of light metal with high thermal conductivity, such as aluminum. The diameter of disc 1 exceeds the diameter of the pipe being welded by 30-40 mm. The diameter of the outer concentric groove 2 is somewhat larger (at

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несколько миллиметров) диаметра трубы . Диаметр внутреннего концентричного паза 2 на 40 мм меньше диаметра внешнего концентричного паза 2.a few millimeters) of pipe diameter. The diameter of the inner concentric groove 2 is 40 mm smaller than the diameter of the outer concentric groove 2.

Электронагреватель работает следующим образом.The electric heater works as follows.

Перед началом работы две свариваемые трубы обрабатывают так, чтобы и1с поверхности соприкасались без зазоров и были сцентрированы. После этого трубы развод т и между ними ввод т электронагреватель. Электронагреватель предварительно подключают к источнику питани  (например, сварочному трансформатору), на выходе которого установлено соответствующее напр жение, обеспечивающее необходимую мощность. Через несколько минут после установки электронагревател  между трубами температура нь нем достигнет заданного значени , что определ етс  срабатыванием контакта биметаллического реле (на 30% кратковременно падает ток на выходе сварочного трансформатора). При этом температура электронагревател  достигает заданного значени . Трубы прижимают к рабочим поверхност м дисков 1 электронагревател , при этом торцы труб оплавл ютс  определенное врем  до образовани  оплавленного выступа по всей длине окружности труб. Затем, удержива  за ручку электронаг. тель, давление с1 имают, трубы развод т и электронагреватель убирают из зоны сварки. Трубы свод т и сжимают под заданным давлением. Цикл сварки закончен.Before starting the work, the two pipes to be welded are treated so that the surfaces of the surface come into contact without gaps and are centered. Thereafter, the pipes are diluted and an electric heater is inserted between them. An electric heater is pre-connected to a power source (for example, a welding transformer), the output of which is set to the appropriate voltage providing the necessary power. A few minutes after installing the electric heater between the pipes, the temperature will reach a predetermined value, which is determined by the triggering of the contact of the bimetallic relay (the current at the output of the welding transformer decreases briefly by 30%). In this case, the temperature of the electric heater reaches a predetermined value. The pipes are pressed against the working surfaces of the electric heater discs 1, while the ends of the pipes are melted for a certain time until the melted protrusion forms along the entire circumference of the pipes. Then, holding the handle of the electron. The pressure, pressure c1, the pipes are diluted and the electric heater is removed from the welding zone. The pipes are collapsed and compressed at a predetermined pressure. Welding cycle is over.

Claims (2)

1. Электронагреватель дл  контактной сварки труб из термопластов, со- . держащее два диска с концентричными пазами на рабочей поверхности, в которых установлены в керамических изол торах нагревательные элементы, выполненные в виде нихромовой спирали с выводами, св занными с электро- подвод ш 1ми шинами источника питани , отличающийс  тем, что, с целью повышени  качества сварного соединени  и экономии электроэнергии, электронагреватель снабжен биметаллическим темпе ратурным реле, первый контакт которого соединен с первой1. Electric heater for contact welding of thermoplastic pipes, co. holding two disks with concentric grooves on the working surface, in which heating elements are installed in ceramic insulators, made in the form of a nichrome spiral with leads connected to the electrical supply with 1 power supply busbars, characterized in that, in order to improve the quality of the welded connection and energy saving, the electric heater is equipped with a bimetallic temperature relay, the first contact of which is connected to the first шиной источника питани , а второй контакт - с второй шиной источника питани  через нагревательный элемент, размещенный во внутреннем концентрич- , ном пазу дисков, причем перва  шина источника питани  соединена с второй его шиной через нагревательный элемент , размещенный во внешнем концентричном пазу дисков.юthe power supply bus and the second contact to the second power supply bus through a heating element placed in the inner concentric slot of the disks, the first power supply bus connected to its second bus through a heating element placed in the outer concentric groove of the disks. 2. Электронагреватель по п. 1,, отличающийс  тем, что он снабжен ручкой из материала с низкой теплопроводностью, закрепленной на дисках посредством двух стоек, на одной из которых расположено биметаллическое температурное реле, а на другой - выводы нагревательных элементов .2. Electric heater according to claim 1, characterized in that it is provided with a handle made of a material with low thermal conductivity, mounted on the discs by means of two racks, one of which is equipped with a bimetallic temperature relay, and the other is the terminals of heating elements. ,//// Фи$ЛFi $ L 16 115фи 216 115 fi 2 16sixteen
SU874254471A 1987-05-04 1987-05-04 Electric heater for resistance welding of pipes from thermoplastic materials SU1502398A1 (en)

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Application Number Priority Date Filing Date Title
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Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Авторское свидетельство СССР № J224169, кл. В 29 С 65/18, 1984. Авторское свидетельство СССР 189550, кл. В 29 С 65/18, 1965. *

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