• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A steel pipe with a thermoplastic cover has the coverage of a welding seam reinforced by hot air heating the cover along the plastic and extruding a strip of similar plastic thereon, followed by cold water spray cooling. The pipe is centered as to the position of the welding seam vis-a-vis the heating and extruding equipment during relative longitudinal movement.
    公开号:SU824885A3
    申请号:SU792843109
    申请日:1979-11-11
    公开日:1981-04-23
    发明作者:Блюме Хельмут；Хаккерт Карл-Хайнц
    申请人:Маннесманн А.Г. (Фирма)；
    IPC主号:
    专利说明:

    useless consumption of material and thus increased costs.
    The closest in technical essence to the present invention is a method of applying a polymer coating on a steel pipe with a welded seam, which consists in applying a surface layer of thermoplastic plastic in the form of a hose or tape on the outer surface of a steel pipe with a preliminarily n-applied adhesive and applying a protective strip of thermoplastic plastic to the weld area (and a device for implementing the method, which contains a device for installing a steel pipe with a surface layer of oplastichnoy plastics and means for applying a protective strip made of thermoplastic material, placed above the steel pipe 2,
    In the method, immediately before application, a protective strip of thermoplastic plastic is applied to the weld area along the surface of the adhesive layer and adhesive material, aligning the protrusion of the weld.
    The disadvantage of the method is that the protective strip does not fit tightly to the weld, which contributes to the formation of capillary slots along the weld and reduces the quality of the coating.
    The purpose of the invention is to improve the quality of the coating.
    This goal is achieved by the fact that according to the method of coating steel pipes with a welded seam, consisting in applying a surface layer of thermoplastic plastic in the form of a hose or tape on the outer surface of a steel pipe with a pre-applied adhesive substance and applying a protective strip of thermoplastic plastics after the application of the surface layer is carried out by extrusion, the application of a protective strip consisting of the same thermoplastic plastic with the surface layer, moreover, the surface layer at the site of the weld before heating the protective strip is heated to the softening temperature. In addition, the heating of the surface layer and the application of the protective strip are carried out continuously. In a device for carrying out the method comprising a device for installing a steel pipe with a surface layer of thermoplastic plastic and a device for applying a protective strip of thermoplastic plastic placed above the steel pipe, a device for applying a protective strip M made in the form of an extruder, dies
    which is directed to the welded seam of the steel pipe, and the device is equipped with a hot air blower and the heating of the surface layer in the weld: the seam located in front of the spinneret and with sprinkler
    cooling with water mounted behind the spinneret. In addition, the device
    equipped with a contact element installed in front of the hot air blower for determining the position of the weld, electrically connected. with a mechanism for turning the steel pipe or with an extruder nozzle to adjust its position. The device is equipped with a means for measuring the volume that is installed behind the sprinkler. The device for applying the protective strip is fixed.
    The drawing schematically shows a device which is already coiled for coating a welded steel pipe. ,
    Device contains a device for installing a steel pipe with a surface layer of thermoplastic plastic, including a carriage 1 and a mechanism 2 for turning a steel pipe. A support plate 4 is mounted on the carrier beam 3 on which a device for applying a protective strip in the form of an extruder 5 is attached with an exit die 6 directed towards the saar seam of the pipe. In front of the die 6 of the extruder 5, a hot air blower 7 is installed and, after it, an irrigator 8 for cooling water. At the front end of the supporting plate 4 there is a contact element 9 defining the position of the weld, and at the rear end of the supporting plate 4 is mounted a means for measuring the thickness of the layer — a thickness gauge 10. The inlet pipes 11 and 12 are designed for granulated thermoplastic plastic-polyethylene and cooling water. On the supporting beam 3, pressure cylinders 13 are installed, the pistons of which act on the supporting plate 4 and press the devices fixed on it to the upper line of the pipe.
    The contact element 9 is electrically connected with the mechanism 2 for turning the steel pipe or with the nozzle b to adjust its position (not shown in the drawing). The method is carried out as follows.
    To coat the weld seam 14, the steel pipe 15 with the surface layer is moved in the direction of the arrow. In this case, the applied layer of polyethylene is heated by the hot air blower 7 at the weld section 14 to the softening temperature and immediately after this, a polyethylene film is applied as an encapsulated layer to the softened layer by the die 6 on the extruder 5. Then the sprinkler 8 quickly cools the soft layer. The contact element 9 of the weld seam 14 is electrically connected to the mechanism 2 for turning the steel pipe 15 through a control device (not shown) and provides accurate longitudinal movement of the welded seam 14 under the hot air blower 7, the die 6 of the extruder 5 and the sprinkler 8. The thickness gauge 10 serves . Control of finished weld seam 14.
    In the present invention, instead of axial movement of the steel pipe 15, the supporting plate 4 can be moved with the devices located on it above the weld seam 14. To coat the spiral welded seams, the contact element 9 controls the turning mechanism 2 and the axial feed of the carriage 1 or the supporting plate 4.
    The proposed method and device can be applied, when a local thickened coating in the form of a strip or protrusion of thermoplastic plastic is needed on the outer part of a steel pipe coated with a surface layer.
    权利要求:
    Claims (6)
    [1]
    1. A method of applying a polymer coating on steel pipes with a welded seam, consisting of applying a surface layer of thermoplastic plastic in the form of a hose or tape on the outer surface of a steel pipe with a pre-applied adhesive and applying a protective strip of thermoplastic plastic to the section of the weld, characterized by that, in order to improve the quality of the coating, after the application of the surface layer, a protective strip is applied by extrusion; I eat a thermoplastic plastic, wherein a surface layer portion
    weld before heating the protective strip is heated to the softening temperature,
    [2]
    2. A method according to claim 1, characterized in that the heating of the surface layer and the application of the protective strip are carried out continuously.
    [3]
    3. A device for applying a polymer coating on steel pipes with a welded seam, containing
    0 fixture for installation of pipe with surface layer
    from thermoplastic plastic and a device for applying a protective strip of thermoplastic plastic, placed above a steel pipe, characterized in that the device for applying a protective strip is made in the form of an extruder whose filler is directed
    0 to the weld of the steel pipe, and the device is equipped with a hot air blower for heating the surface layer at the weld section located in front of the die, and with an irrigator to cool 5 with water mounted behind the die.
    [4]
    4. The device according to claim 3, characterized in that it is provided with a contact element installed in front of the hot air blower for determining the position of the weld, electrically connected to the mechanism for turning the steel pipe or to the extruder nozzle to adjust its position.
    [5]
    5. Device on dp. 3.4, characterized in that it is provided with a means for measuring the thickness of the layer installed behind the sprinkler.
    [6]
    6. The device according to paragraphs. 3-5, about tl and .4 It appears that the device for applying the protective strip is fixed.
    five
    Sources of information taken into account in the examination
    1. The patent of Germany 1771764, class, 75 6/00, published. 1972.
    2. Patent FRG No. 2176618,
    0
    cl. 75 from 6/00, published. 1972 (prototype).
    类似技术:
    公开号 | 公开日 | 专利标题
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    SU824885A3|1981-04-23|Method and device for polymeric coating of steel tube with welded seam
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    DK157098B|1989-11-06|PROCEDURE FOR MAKING A HEAT-INSULATED CONNECTOR
    US3497588A|1970-02-24|Method for producing pipe having a bend
    GB1588399A|1981-04-23|Laminated plastics/metal tube
    同族专利:
    公开号 | 公开日
    DE2849814C2|1980-10-09|
    US4287223A|1981-09-01|
    NL7906730A|1980-05-19|
    JPS603981B2|1985-01-31|
    IT7925890D0|1979-09-20|
    DE2849814B1|1980-02-21|
    IT1123259B|1986-04-30|
    JPS5567411A|1980-05-21|
    FR2441483A1|1980-06-13|
    GB2035148B|1982-12-22|
    GB2035148A|1980-06-18|
    FR2441483B1|1983-11-25|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CH536198A|1971-04-05|1973-04-30|Mannesmann Ag|Method and device for sheathing a steel pipe with thermoplastic material|DE3130119C2|1981-07-27|1983-07-07|Mannesmann AG, 4000 Düsseldorf|Process for the edge-controlled application of a colored line on elongated rolling stock|
    US5003918A|1989-12-28|1991-04-02|Interventional Technologies, Inc.|Apparatus for manufacturing atherectomy torque tubes|
    US5352292A|1993-01-04|1994-10-04|The Kendall Company|Apparatus for coating exterior weld joints of a pipe|
    GB9810898D0|1998-05-20|1998-07-22|Nullifire Ltd|Apparatus and method for casting a coating onto a pillar|
    GB0121015D0|2001-08-30|2001-10-24|Bredero Price Coaters Ltd|Coating procedures and equipment|
    CA2537348A1|2006-02-22|2007-08-22|Shawcor Ltd.|Coating method for pipe having weld bead|
    CN102909157A|2012-10-11|2013-02-06|浙江师范大学|Injection device suitable for spraying electrothermal film on inner wall of heating tube|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE2849814A|DE2849814C2|1978-11-14|1978-11-14|Method and device for coating a steel pipe having a weld seam with a jacket layer made of thermoplastic material|
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