WO2011016750A1 - Method for applying thermoplastic coatings to the internal surface of metallic pipes and apparatus for carrying out said method - Google Patents

Method for applying thermoplastic coatings to the internal surface of metallic pipes and apparatus for carrying out said method Download PDF

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Publication number
WO2011016750A1
WO2011016750A1 PCT/RU2010/000228 RU2010000228W WO2011016750A1 WO 2011016750 A1 WO2011016750 A1 WO 2011016750A1 RU 2010000228 W RU2010000228 W RU 2010000228W WO 2011016750 A1 WO2011016750 A1 WO 2011016750A1
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WO
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Prior art keywords
thermoplastic
coating
nozzle
thermoplast
applying
Prior art date
Application number
PCT/RU2010/000228
Other languages
French (fr)
Russian (ru)
Inventor
Фирдаус Усманович ЗАМАЛЕЕВ
Малик Фавзавиевич ГАЙСИН
Александр Николаевич ПИЛЮГИН
Original Assignee
Zamaleev Firdaus Usmanovich
Gaisin Malik Favzavievich
Pilyugin Alexandr Nikolaevich
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Application filed by Zamaleev Firdaus Usmanovich, Gaisin Malik Favzavievich, Pilyugin Alexandr Nikolaevich filed Critical Zamaleev Firdaus Usmanovich
Publication of WO2011016750A1 publication Critical patent/WO2011016750A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C7/00—Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work
    • B05C7/06—Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work by devices moving in contact with the work
    • B05C7/08—Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work by devices moving in contact with the work for applying liquids or other fluent materials to the inside of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/021—Apparatus for spreading or distributing liquids or other fluent materials already applied to the surface of an elongated body, e.g. a wire, a tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C7/00—Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work
    • B05C7/005—Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work by devices in contact with moving work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B05D1/265—Extrusion coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • B29C48/152—Coating hollow articles the inner surfaces 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • B29C48/152—Coating hollow articles the inner surfaces thereof
    • B29C48/153—Coating both inner and outer 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • B29C48/902—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies internally
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
    • F16L58/1045—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe the coating being an extruded or a fused layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92809—Particular value claimed
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92895—Barrel or housing
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0072—Roughness, e.g. anti-slip
    • 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
    • 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

Definitions

  • the invention relates to mechanical engineering technology, in particular to the coating of various thermoplastic materials on the inner surfaces of metal pipes, and can be used in the manufacture of coatings of the inner surface of metal pipes for the chemical, oil, gas industry, as well as in public utilities.
  • a known method of applying polymer coatings on the inner surface of cylindrical products including installing a punch in the cavity of the product with an annular gap between the punch and the product mounted motionless in a mold equipped with a fixed guide rod, further filling the mold with polymeric material, heating in the assembled furnace structures, punch loading by pressure and subsequent cooling of the structure (see RF patent 2337816)
  • a significant disadvantage of this method is the extremely large material and labor costs for the implementation of this method for long products, as well as the need to manufacture a separate tool for products of various sizes.
  • a known method and device for applying polymer coatings to a metal pipe includes internal and external extrusion heads for applying internal and external polymer coatings to the pipe, injection channels for adhesive melts of polymer and adhesive, and molding chambers with forming sections and associated calibration sections.
  • the method of coating consists in the simultaneous molding of tubular shells on the outer and inner surfaces of the metal pipe, by injection of the thermoplastic and its subsequent curing (see RF patent 2088404 from 06/27/1997).
  • the considered technical solution is the closest in its technical essence to the invention, however, it also has disadvantages.
  • the main disadvantage is that the known method can only be used in conjunction with the production of the metal pipe itself by the electric-welded method.
  • the technical result of the claimed invention is to reduce the material and laboriousness in the manufacture of both the device itself and the process of applying thermoplastic coatings on the inner surface of metal pipes, as well as improving the accuracy of the coating and the strength of the connection of the coating with the metal surface, obtaining a smooth, uniform coating structure,
  • the arsenal of existing coating devices and methods is expanding.
  • a device for applying thermoplastic coatings to the inner surface of metal pipes including an extruder and a universal head
  • the universal head having a feed channel and comprising a distribution head and a nozzle has a replaceable distribution head configured to coat metal pipes of various lengths, which is limited by the length of the feed channel and the inner diameter
  • the distribution head has an opening in communication with the feed channel, the feed channel, Full a rod with an axial bore and has at least four heating element arranged in the groove
  • the outer surface of the nozzle is treated at least to the 7th grade purity to obtain a smooth coating surface.
  • thermoplastic coatings to the inner surface of metal pipes, including cleaning and degreasing the inner surface of the metal pipe, injecting the thermoplastic and subsequently curing it, before supplying the thermoplastic, the feed channel is heated using the heaters installed in it at 20-30 0 C above the transition temperature the thermoplastic is in a viscous flow state, and coolant, such as antifreeze or tap water, is supplied under pressure to the nozzle cavity to cool the walls and maintain Temperature nozzle not more than 4O 0 C, with curing of the coating and produce a uniform coating structure and a strong bond with the metal pipe.
  • coolant such as antifreeze or tap water
  • the coating device consists of a frame and an extruder with a universal head mounted on it, which in turn consists of a thermoplastic feed channel (1), a distribution head (2) and a nozzle (3) forming the coating surface (Fig. L).
  • a thermoplastic feed channel (1) a thermoplastic feed channel (1)
  • a distribution head (2) a distribution head
  • a nozzle (3) forming the coating surface (Fig. L).
  • the thermoplastic feed channel is a rod (1) with an axial hole, through which a thermoplastic preheated to a viscous-fluid state and at least four heating elements (7) are laid in grooves bored along the generatrix of the rod at an equal distance from each other (Fig. 2 )
  • the outer surface of the rod with heating elements is wrapped with asbestos cloth (8) and closed with a metal tube (9) (figure 2).
  • One end of the feed channel is connected to the extruder, the other end has a threaded connection to the distribution head, so that it is possible to install the distribution head to the specific size of the pipe to be coated.
  • the distribution head on the side of the connection to the supply channel, has the same hole passing at least into four channels, along He heated thermoplastic is fed into the filled area. At the same time, the distribution head centers the nozzle to obtain a coating of uniform thickness.
  • the nozzle is connected to the distribution head by means of a threaded connection for the possibility of its removal and cleaning.
  • the nozzle (3) is a metal cylinder, into the cavity of which is supplied by means of a tube (4), a fitting (5) and a hose (6) coolant (Fig. 1). At the end of the nozzle opposite from the distribution head, at least four holes are provided for spraying coolant over the coating surface.
  • the outer surface of the nozzle is processed to at least 7th grade of cleanliness to obtain a smooth coating surface.
  • the universality of the head is that the coating can be applied to pipes of various lengths and is limited only by the length of the thermoplastic feed channel, and if it is necessary to coat pipes of various diameters, it is enough to change the distribution head corresponding to the inner diameter of the pipe and nozzle to ensure the required coating thickness, which in turn, quite simple to manufacture. That is, the universal head is (composite) interchangeable to produce coatings of different thicknesses on pipes with different inner diameters.
  • the coating method includes the cleaning and degreasing of the inner surface of the metal pipe, its further installation on the assembled device so that the channels of the distribution head are located at the end of the pipe.
  • the feed channel is heated with the help of heating elements to a temperature exceeding the temperature of the thermoplastic transition into a viscous-fluid state by 20-30 ° C, and coolant, for example antifreeze or tap water, is supplied into the cavity of the nozzle to cool the walls of the nozzle.
  • coolant for example antifreeze or tap water
  • the thermoplastic under pressure enters the feed head into the distribution head and then through the channels to the filled area, after which the metal pipe is set in motion by rollers, unidirectional with the feed of the thermoplastic.
  • the speed of the pipe corresponds to the feed rate of the thermoplastic.
  • the cooling liquid is supplied to the nozzle cavity under pressure to ensure that it is sprayed on the surface of the applied coating and to maintain the nozzle temperature of not more than 4O 0 C. Simultaneous coating and its cooling by the nozzle surface and the sprayed coolant allows to obtain a uniform coating structure and a strong bond with the metal pipe.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The inventions relate to machine building technology, in particular to applying coatings made of thermoplastic materials to the internal surfaces of metallic pipes. The apparatus for applying a coating consists of an extruder with a universal head mounted thereon, the universal head consisting of a thermoplast supply channel, a distributing head and a nozzle which forms the coating surface. The thermoplast supply channel comprises a shaft with an axial opening, along which the heated thermoplast is supplied, and has tubular electric heaters placed into grooves bored out along the shaft generatrix. The distributing head has an opening passing into four channels along which the heated thermoplast is supplied. The nozzle is connected to the distributing head in the form of a metallic cylinder, into the cavity of which cooling liquid is supplied. The method for applying the coating comprises operations to clean and degrease the internal surface of the pipe, and, prior to the beginning of supplying the thermoplast, the supply channel is heated with the aid of the tubular electric heaters, and cooling liquid for cooling the nozzle walls is supplied under pressure into the nozzle cavity. When supplied, the thermoplast, having transferred into a viscous-flow state, passes under pressure along the supply channel into the distributing head and then along the channels. The invention ensures a reduction in the material consumption and labour intensity for applying thermoplastic coatings, an increase in the coating manufacturing accuracy and in the strength of the connection of the coating to the metallic surface.

Description

СПОСОБ НАНЕСЕНИЯ ТЕРМОПЛАСТИЧНЫХ ПОКРЫТИЙ НА METHOD FOR APPLYING THERMOPLASTIC COATINGS ON
ВНУТРЕННЮЮ ПОВЕРХНОСТЬ МЕТАЛЛИЧЕСКИХ ТРУБ ИINTERNAL SURFACE OF METAL PIPES AND
УСТРОЙСТВО ДЛЯ ЕГО ОСУЩЕСТВЛЕНИЯ DEVICE FOR ITS IMPLEMENTATION
ОПИСАНИЕ ИЗОБРЕТЕНИЯ DESCRIPTION OF THE INVENTION
Изобретение относится к технологии машиностроения, в частности к нанесению покрытий из различных термопластичных материалов на внутренние поверхности металлических труб, и может быть использовано при производстве покрытий внутренней поверхности металлических труб для химической, нефтяной, газовой промышленности, а также в коммунальном хозяйстве. The invention relates to mechanical engineering technology, in particular to the coating of various thermoplastic materials on the inner surfaces of metal pipes, and can be used in the manufacture of coatings of the inner surface of metal pipes for the chemical, oil, gas industry, as well as in public utilities.
Известен способ нанесения полимерных покрытий на внутреннюю поверхность цилиндрических изделий, включающий установку пуансона в полости изделия с обеспечением кольцевого зазора между пуансоном и изделием, установленным неподвижно в пресс-форме, снабженной неподвижным направляющим штоком, дальнейшее заполнение пресс-формы полимерным материалом, нагрев в печи собранной конструкции, нагружение пуансона давлением и последующее охлаждение конструкции (см. патент РФ 2337816)  A known method of applying polymer coatings on the inner surface of cylindrical products, including installing a punch in the cavity of the product with an annular gap between the punch and the product mounted motionless in a mold equipped with a fixed guide rod, further filling the mold with polymeric material, heating in the assembled furnace structures, punch loading by pressure and subsequent cooling of the structure (see RF patent 2337816)
Существенным недостатком данного способа является крайне большие материало и трудозатраты на осуществление данного способа для длинномерных изделий, а также необходимость изготовления отдельной оснастки для изделий различных размеров.  A significant disadvantage of this method is the extremely large material and labor costs for the implementation of this method for long products, as well as the need to manufacture a separate tool for products of various sizes.
Известен способ и устройство для нанесения полимерных покрытий на металлическую трубу. Устройство включает внутреннюю и внешнюю экструзионные головки для нанесения внутреннего и внешнего полимерных покрытий на трубу, каналы нагнетания расплавов адгезива и полимера, и камеры формования с формующими участками и сопряженными с ними калибрующими участками. Способ нанесения покрытия, заключается в одновременном формовании трубчатых оболочек на наружной и внутренней поверхностях металлической трубы, путем нагнетания термопласта и последующего его отверждения (см. патент РФ 2088404 от 27.06.1997). A known method and device for applying polymer coatings to a metal pipe. The device includes internal and external extrusion heads for applying internal and external polymer coatings to the pipe, injection channels for adhesive melts of polymer and adhesive, and molding chambers with forming sections and associated calibration sections. The method of coating consists in the simultaneous molding of tubular shells on the outer and inner surfaces of the metal pipe, by injection of the thermoplastic and its subsequent curing (see RF patent 2088404 from 06/27/1997).
Рассмотренное техническое решение является наиболее близким по своей технической сущности предлагаемому изобретению, однако, ему также присущи недостатки. Основной недостаток состоит в том, что известный способ может быть использован только совместно с производством самой металлической трубы электросварным методом. Кроме того, для изделий различного диаметра необходимо изготовление, соответствующих по размеру, системы подачи материала покрытия.  The considered technical solution is the closest in its technical essence to the invention, however, it also has disadvantages. The main disadvantage is that the known method can only be used in conjunction with the production of the metal pipe itself by the electric-welded method. In addition, for products of various diameters, it is necessary to manufacture, corresponding in size, the supply system of the coating material.
Техническим результатом заявленного изобретения является снижение материало и трудоемкости при изготовлении, как самого устройства, так и процесса нанесения термопластичных покрытий на внутреннюю поверхность металлических труб, а также повышение точности изготовления покрытия и прочности соединения покрытия с металлической поверхностью, получение гладкой, равномерной структуры покрытия, также расширяется арсенал существующих устройств и способов нанесения покрытий.  The technical result of the claimed invention is to reduce the material and laboriousness in the manufacture of both the device itself and the process of applying thermoplastic coatings on the inner surface of metal pipes, as well as improving the accuracy of the coating and the strength of the connection of the coating with the metal surface, obtaining a smooth, uniform coating structure, The arsenal of existing coating devices and methods is expanding.
Для этого в устройстве для нанесения термопластичных покрытий на внутреннюю поверхность металлических труб, включающем экструдер и универсальную головку, универсальная головка, имеющая канал подачи и содержащая, распределительную головку и насадку, имеет сменную распределительную головку, выполненную с возможностью нанесения покрытий на металлические трубы различной длины, которая ограничена длиной канала подачи и внутренним диаметром, причем распределительная головка имеет отверстие, сообщающееся с каналом подачи, канал подачи, выполнен в виде стержня с осевым отверстием и имеет, по крайней мере, четыре ТЭНа уложенные в канавки, при этом наружная поверхность насадки обработана не менее чем до 7-го класса чистоты для получения гладкой поверхности покрытия. При этом в способе нанесения термопластичных покрытий на внутреннюю поверхность металлических труб, включающем очистку и обезжиривание внутренней поверхности металлической трубы, нагнетание термопласта и последующее его отверждение, перед нагнетанием термопласта канал подачи разогревают с помощью установленных в нем ТЭНов на 20-300C выше температуры перехода термопласта в вязкотекучее состояние, а в полость насадки подают, под давлением, охлаждающую жидкость, например тосол или водопроводную воду, для охлаждения стенок и поддержания температуры насадки не более 4O0C с возможностью отвердения покрытия и получения равномерной структуры покрытия и прочной связи с металлической трубой. To this end, in a device for applying thermoplastic coatings to the inner surface of metal pipes, including an extruder and a universal head, the universal head having a feed channel and comprising a distribution head and a nozzle has a replaceable distribution head configured to coat metal pipes of various lengths, which is limited by the length of the feed channel and the inner diameter, and the distribution head has an opening in communication with the feed channel, the feed channel, Full a rod with an axial bore and has at least four heating element arranged in the groove, the outer surface of the nozzle is treated at least to the 7th grade purity to obtain a smooth coating surface. In this case, in the method of applying thermoplastic coatings to the inner surface of metal pipes, including cleaning and degreasing the inner surface of the metal pipe, injecting the thermoplastic and subsequently curing it, before supplying the thermoplastic, the feed channel is heated using the heaters installed in it at 20-30 0 C above the transition temperature the thermoplastic is in a viscous flow state, and coolant, such as antifreeze or tap water, is supplied under pressure to the nozzle cavity to cool the walls and maintain Temperature nozzle not more than 4O 0 C, with curing of the coating and produce a uniform coating structure and a strong bond with the metal pipe.
Устройство для нанесения покрытия состоит из рамы и экструдера с установленной на нем универсальной головкой, которая в свою очередь состоит из канала подачи термопласта (1), распределительной головки (2) и насадки (3), формирующей поверхность покрытия (фиг.l). Для фиксации металлической трубы в горизонтальном положении и ее перемещения в процессе нанесения покрытия, на раме устройства установлены роликовые опоры.  The coating device consists of a frame and an extruder with a universal head mounted on it, which in turn consists of a thermoplastic feed channel (1), a distribution head (2) and a nozzle (3) forming the coating surface (Fig. L). To fix the metal pipe in a horizontal position and move it during the coating process, roller bearings are installed on the device frame.
Канал подачи термопласта представляет собой стержень (1) с осевым отверстием, по которому подается разогретый до вязкотекучевого состояния термопласт и, по крайней мере, четыре ТЭНа (7) уложенные в канавки, расточенные по образующей стержня на равном удалении друг от друга (фиг.2). Наружная поверхность стержня с ТЭНами обмотана асбестовой тканью (8) и закрыта металлической трубкой (9) (фиг.2). Один конец канала подачи соединен с экструдером, другой конец имеет резьбовое соединение с распределительной головкой, для того чтобы была возможность установки распределительной головки под конкретный размер трубы, подлежащей покрытию.  The thermoplastic feed channel is a rod (1) with an axial hole, through which a thermoplastic preheated to a viscous-fluid state and at least four heating elements (7) are laid in grooves bored along the generatrix of the rod at an equal distance from each other (Fig. 2 ) The outer surface of the rod with heating elements is wrapped with asbestos cloth (8) and closed with a metal tube (9) (figure 2). One end of the feed channel is connected to the extruder, the other end has a threaded connection to the distribution head, so that it is possible to install the distribution head to the specific size of the pipe to be coated.
Распределительная головка, со стороны соединения с каналом подачи, имеет такое же отверстие, переходящее, по крайней мере, в четыре канала, по ним разогретый термопласт подается в заполняемую область. Одновременно распределительная головка центрует насадку для получения покрытия равномерной толщины. Насадка соединена с распределительной головкой с помощью резьбового соединения для возможности ее снятия и очистки. The distribution head, on the side of the connection to the supply channel, has the same hole passing at least into four channels, along He heated thermoplastic is fed into the filled area. At the same time, the distribution head centers the nozzle to obtain a coating of uniform thickness. The nozzle is connected to the distribution head by means of a threaded connection for the possibility of its removal and cleaning.
Насадка (3) представляет собой металлический цилиндр, в полость которого подается посредством трубки (4), штуцера (5) и шланга (6) охлаждающая жидкость (фиг.l). На противоположном от распределительной головки торце насадки проточены, по крайней мере, четыре отверстия для распыления охлаждающей жидкости по поверхности покрытия. Наружная поверхность насадки обработана не менее чем до 7-го класса чистоты для получения гладкой поверхности покрытия.  The nozzle (3) is a metal cylinder, into the cavity of which is supplied by means of a tube (4), a fitting (5) and a hose (6) coolant (Fig. 1). At the end of the nozzle opposite from the distribution head, at least four holes are provided for spraying coolant over the coating surface. The outer surface of the nozzle is processed to at least 7th grade of cleanliness to obtain a smooth coating surface.
Универсальность головки состоит в том, что покрытие может наноситься на трубы различных длин и ограничивается лишь длиной канала подачи термопласта, а при необходимости нанесения покрытия на трубы различных диаметров достаточно сменить распределительную головку, соответствующую внутреннему диаметру трубы и насадку, для обеспечения необходимой толщины покрытия, которые в свою очередь достаточно просты в изготовлении. То есть универсальная головка является (составной) сменной для получения покрытий различной толщины на трубах с различным внутренним диаметром.  The universality of the head is that the coating can be applied to pipes of various lengths and is limited only by the length of the thermoplastic feed channel, and if it is necessary to coat pipes of various diameters, it is enough to change the distribution head corresponding to the inner diameter of the pipe and nozzle to ensure the required coating thickness, which in turn, quite simple to manufacture. That is, the universal head is (composite) interchangeable to produce coatings of different thicknesses on pipes with different inner diameters.
Способ нанесения покрытия включает операции очистки и обезжиривания внутренней поверхности металлической трубы, дальнейшую ее установку на собранное устройство так чтобы каналы распределительной головки находились у торца трубы. Перед началом подачи термопласта, канал подачи разогревают с помощью ТЭНов до температуры, превышающей температуру перехода термопласта в вязкотекучее состояние, на 20-300C, а в полость насадки подают под давлением охлаждающую жидкость, например тосол или водопроводную воду, для охлаждения стенок насадки. После этого начинают подачу термопласта с помощью экструдера. Перейдя в вязкотекучее состояние, термопласт под давлением поступает по каналу подачи в распределительную головку и далее по каналам в заполняемую область, после чего металлическую трубу роликами приводят в движение, однонаправленное с подачей термопласта. Скорость движения трубы соответствует скорости подачи термопласта. The coating method includes the cleaning and degreasing of the inner surface of the metal pipe, its further installation on the assembled device so that the channels of the distribution head are located at the end of the pipe. Before starting the supply of thermoplastic, the feed channel is heated with the help of heating elements to a temperature exceeding the temperature of the thermoplastic transition into a viscous-fluid state by 20-30 ° C, and coolant, for example antifreeze or tap water, is supplied into the cavity of the nozzle to cool the walls of the nozzle. After that, the thermoplastic feed is started using an extruder. Having passed into a viscous flowing state, the thermoplastic under pressure enters the feed head into the distribution head and then through the channels to the filled area, after which the metal pipe is set in motion by rollers, unidirectional with the feed of the thermoplastic. The speed of the pipe corresponds to the feed rate of the thermoplastic.
Охлаждающая жидкость в полость насадки подается под давлением для обеспечения распыления ее по поверхности нанесенного покрытия и поддержания температуры насадки не более 4O0C. Одновременное нанесение покрытия и его охлаждение поверхностью насадки и распыляемой охлаждающей жидкостью позволяет получить равномерную структуру покрытия и прочную связь с металлической трубой. The cooling liquid is supplied to the nozzle cavity under pressure to ensure that it is sprayed on the surface of the applied coating and to maintain the nozzle temperature of not more than 4O 0 C. Simultaneous coating and its cooling by the nozzle surface and the sprayed coolant allows to obtain a uniform coating structure and a strong bond with the metal pipe.

Claims

ФОРМУЛА ИЗОБРЕТЕНИЯ CLAIM
1. Устройство для нанесения термопластичных покрытий на внутреннюю поверхность металлических труб, включающее экструдер и универсальную головку, отличающееся тем, что универсальная головка, имеющая канал подачи и содержащая, распределительную головку и насадку, имеет сменную распределительную головку, выполненную с возможностью нанесения покрытий на металлические трубы различной длины, которая ограничена длиной канала подачи, различным внутренним диаметром и различной толщиной покрытия, причем распределительная головка имеет отверстие, сообщающееся с каналом подачи, канал подачи, выполнен в виде стержня с осевым отверстием и имеет, по крайней мере, четыре ТЭНа уложенные в канавки, при этом наружная поверхность насадки обработана не менее чем до 7-го класса чистоты для получения гладкой поверхности покрытия. 1. A device for applying thermoplastic coatings on the inner surface of metal pipes, including an extruder and a universal head, characterized in that the universal head having a feed channel and comprising a distribution head and nozzle has a replaceable distribution head configured to coat metal pipes different lengths, which is limited by the length of the feed channel, various internal diameters and various coating thicknesses, the distribution head having an opening The channel communicating with the feed channel, the feed channel, is made in the form of a rod with an axial hole and has at least four heating elements laid in grooves, while the outer surface of the nozzle is processed at least up to grade 7 to obtain a smooth coating surface .
2. Устройство по п. 1, отличающееся тем, что канавки, расточены по образующей стержня на равном удалении друг от друга.  2. The device according to claim 1, characterized in that the grooves are bored along the generatrix of the rod at an equal distance from each other.
3. Устройство по п. 1 и п. 2 , отличающееся тем, что наружная поверхность стержня с ТЭНами обмотана асбестовой тканью и закрыта металлической трубкой.  3. The device according to p. 1 and p. 2, characterized in that the outer surface of the rod with heating elements is wrapped with asbestos cloth and covered with a metal tube.
4. Устройство по п. 1, отличающееся тем, что отверстие в распределительной головке, сообщающееся с каналом подачи, переходит, по крайней мере, в четыре канала подающие термопласт в заполняемую область.  4. The device according to p. 1, characterized in that the hole in the distribution head, communicating with the feed channel, passes into at least four channels supplying the thermoplastic to the filled area.
5. Устройство по п. 1 и п. 4, отличающееся тем, что распределительная головка, имеет наружный диаметр, соответствующий внутреннему диаметру, подлежащей покрытию трубы, с возможностью выполнения одновременно роли центратора для получения покрытия равномерной толщины.  5. The device according to p. 1 and p. 4, characterized in that the distribution head has an outer diameter corresponding to the inner diameter of the pipe to be coated, with the possibility of simultaneously acting as a centralizer to obtain a coating of uniform thickness.
6. Устройство по п. 1, отличающееся тем, что насадка выполнена в виде цилиндра с полостью и, по крайней мере, четырьмя каналами для распыления охлаждающей жидкости, расположенными на противоположном от распределительной головки торце. 6. The device according to p. 1, characterized in that the nozzle is made in the form of a cylinder with a cavity and at least four channels for spraying coolant located on the opposite side from the distribution head.
7. Способ нанесения термопластичных покрытий на внутреннюю поверхность металлических труб, включающий очистку и обезжиривание внутренней поверхности металлической трубы, нагнетание термопласта и последующее его отверждение, отличающийся тем, что перед нагнетанием термопласта канал подачи разогревают с помощью установленных в нем ТЭНов на 20-300C выше температуры перехода термопласта в вязкотекучее состояние, а в полость насадки подают, под давлением, охлаждающую жидкость, например тосол или водопроводную воду, для охлаждения стенок и поддержания температуры насадки не более 4O0C с возможностью отвердения покрытия и получения равномерной структуры покрытия и прочной связи с металлической трубой. 7. A method of applying thermoplastic coatings to the inner surface of metal pipes, including cleaning and degreasing the inner surface of the metal pipe, injecting the thermoplastic and then curing it, characterized in that before the thermoplastic is injected, the feed channel is heated with the help of heating elements installed in it at 20-30 0 C higher than the transition temperature of the thermoplastic into a viscous flow state, and coolant, for example antifreeze or tap water, is supplied into the cavity of the nozzle under pressure to cool the walls and maintaining the nozzle temperature not more than 4O 0 C with the possibility of hardening the coating and obtaining a uniform coating structure and strong bond with the metal pipe.
8. Способ по п.7, отличающийся тем, что после начала нагнетания термопласта, покрываемую трубу приводят роликами в движение, в одном направлении с подачей термопласта, со скоростью соответствующей скорости подачи термопласта.  8. The method according to claim 7, characterized in that after the injection of the thermoplastic begins, the pipe to be coated is driven by the rollers in the same direction as the thermoplastic, at a speed corresponding to the thermoplastic.
PCT/RU2010/000228 2009-08-03 2010-05-04 Method for applying thermoplastic coatings to the internal surface of metallic pipes and apparatus for carrying out said method WO2011016750A1 (en)

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