CN109323052B - Composite pipeline and manufacturing method thereof - Google Patents
Composite pipeline and manufacturing method thereof Download PDFInfo
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- CN109323052B CN109323052B CN201811234092.4A CN201811234092A CN109323052B CN 109323052 B CN109323052 B CN 109323052B CN 201811234092 A CN201811234092 A CN 201811234092A CN 109323052 B CN109323052 B CN 109323052B
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- pipe
- adhesive
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- 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
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The application discloses a composite pipeline and a manufacturing method thereof, and belongs to the field of pipeline machining. The manufacturing method of the composite pipeline comprises the following steps: providing a first pipe and a second pipe, wherein the outer diameter of the plastic pipe is slightly smaller than the inner diameter of the metal pipe; curing and molding the adhesive, winding the adhesive on the outer wall of the first pipe, and extruding the first pipe wound with the adhesive into the second pipe; the adhesive liquefies and bonds the first tube to the second tube. The adhesive is made into a strip shape and is wound on the outer wall of the plastic pipe and then inserted into the metal pipe, the thickness of the adhesive wound outside the plastic pipe is controllable and visible, the adhesive is tightly contacted with the plastic pipe and the metal, and the phenomenon that the metal pipe and the plastic pipe are not tightly connected and lack of the adhesive to crack due to the large tolerance range of the inner diameter of the metal pipe is avoided. The manufacturing method is simple and convenient to implement, and the condition that the plastic pipe and the metal pipe are not firmly connected is avoided. The plastic pipe and the metal pipe of the inner plastic steel pipe manufactured by the method are tightly combined without gaps and are not easy to crack.
Description
Technical Field
The application relates to a composite pipeline and a manufacturing method thereof, in particular to a plastic-lined metal pipe for supplying air conditioners, fire fighting, drainage and the like and a manufacturing method thereof, belonging to the field of pipeline processing.
Background
The plastic pipe lined with the plastic steel pipe is generally made of a polyolefin plastic pipe or a crosslinked polyolefin plastic pipe. The lining steel pipe is generally used for bonding a plastic pipe and a steel pipe. The conventional method for manufacturing the plastic-lined steel pipe is to stick liquid adhesive on the outer surface of the plastic pipe, then insert the plastic pipe into the steel pipe, cool the plastic pipe and bond the plastic pipe and the steel pipe by the adhesive. The thickness of the adhesive adhered to the surface of the plastic pipe is 0.1-0.2mm, the plastic pipe must be tightly extruded into the metal pipe, and if the plastic pipe is not tightly extruded, the plastic pipe and the metal pipe are not tightly adhered. Because the tolerance range of the inner diameter of the steel pipe is large, after the plastic pipe is extruded, the gap between the plastic pipe and the steel pipe is not well determined, the effect of the adhesive is not good, and part of the plastic pipe and the steel pipe are adhered, so that the adhesion between the plastic pipe and the steel pipe is not firm.
Disclosure of Invention
In order to solve the problems, the application provides a manufacturing method of a composite pipeline, in the manufacturing method, an adhesive is made into a strip shape and is wound on the outer wall of a plastic pipe and then is inserted into the metal pipe, the thickness of the adhesive wound outside the plastic pipe is controllable and visible, the adhesive is respectively in close contact with the plastic pipe and the metal pipe, and the situations that the metal pipe is cracked due to the fact that the adhesive is lacked between the metal pipe and the plastic pipe is not tightly connected with the metal pipe due to the fact that the tolerance range of the inner diameter of the metal pipe is large are avoided. The manufacturing method is simple and convenient to implement, and the condition that the plastic pipe and the metal pipe are not firmly connected is avoided.
According to one aspect of the present application, there is provided a method of manufacturing a composite pipe, comprising: providing a first pipe and a second pipe, wherein the outer diameter of the plastic pipe is slightly smaller than the inner diameter of the metal pipe;
curing and molding the adhesive, winding the adhesive on the outer wall of the first pipe, and extruding the first pipe wound with the adhesive into the second pipe; the adhesive liquefies and bonds the first tube to the second tube.
Optionally, the first pipe is a plastic pipe and the second pipe is a metal pipe.
Optionally, the second pipe is a steel pipe or a carbon steel pipe; the adhesive is a hot melt adhesive; the step of liquefying the adhesive comprises: the outer wall of the second tube is heated to melt the hot melt adhesive, and the first tube and the second tube are bonded after cooling.
Optionally, the adhesive is cured and formed by making the adhesive into a film; the winding method is spiral winding. Further optionally, the adhesive is cured and formed by forming the adhesive into a strip-shaped film.
Optionally, the cured and shaped adhesive at least partially overlaps when wound.
Optionally, the adhesive is cured to a 0.8-1.0mm thick strip film, the wrapping being 50-70% of the overlap wrapped strip adhesive.
Optionally, the step of liquefying the adhesive comprises: and (3) sealing two ends of the metal pipe, pressurizing and heating the metal pipe to melt the adhesive, keeping for a period of time, exhausting and cooling the metal pipe to obtain the composite pipeline.
Optionally, the method of heating a metal tube comprises: the metal tube is rotated and heated from the middle of the metal tube to both ends. Gas entrained in the adhesive can be vented from the middle to the ends.
Optionally, the binder is selected from polyvinyl acetate, polyvinyl acetal, ethylene-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate copolymer resin, perchloroethylene resin, polyacrylate, polyamide, polysulfone, or maleic anhydride graft binder.
Optionally, the pressure in the metal pipe is 400-600kPa, and is kept for 20-40 min. Further optionally, the pressure in the metal tube is 400-600kPa, and is kept for 30 min.
According to yet another aspect of the present application, there is provided a composite pipe manufactured by the method of any one of the above.
Benefits that can be produced by the present application include, but are not limited to:
1. according to the manufacturing method provided by the application, the adhesive is made into a strip shape and is wound on the outer wall of the plastic pipe and then inserted into the metal pipe, the thickness of the adhesive wound outside the plastic pipe is controllable and visible, the adhesive is respectively in close contact with the plastic pipe and the metal pipe, and the situations that the metal pipe and the plastic pipe are cracked due to the fact that the adhesive is lacked and the plastic pipe and the metal pipe are not tightly connected due to the fact that the tolerance range of the inner diameter of the metal pipe is large are avoided. The manufacturing method is simple and convenient to implement, and the condition that the plastic pipe and the metal pipe are not firmly connected is avoided.
2. The application provides a compound pipeline's mould pipe and tubular metal resonator combine closely, seamless, difficult fracture. According to the steel-plastic composite pipe with the inner liner coated outside, the situation of deletion cannot occur, when the liquid adhesive is coated on the outer wall of the plastic pipe and then inserted into the steel pipe, the liquid adhesive can flow downwards to cause partial deletion, and/or the liquid adhesive is easy to scratch on the steel pipe, and the situation that the plastic pipe and the steel pipe are not firmly adhered and crack due to the deletion of the adhesive can occur.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a perspective front view schematically illustrating a composite pipe according to an embodiment of the present invention.
Fig. 2 is a perspective schematic view of a composite conduit according to an embodiment of the present application.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
In addition, in the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate orientations and positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1 and 2, an embodiment of the present application discloses a method of manufacturing a composite pipe, including: the plastic pipe 2 and the steel pipe 4 are connected through an adhesive 6, and the adhesive comprises a first thickness area 61 and a second thickness area 62 which are adjacently arranged.
The first thickness region 61 is in the form of a spiral around the plastic tube, the second thickness region 62 is in the form of a spiral disposed adjacent to the first thickness region, and the average thickness H1 of the first thickness region 61 is greater than the approximate thickness value H2 of the second thickness region 62.
The adhesive 6 is a hot-melt adhesive, the adhesive 6 can be formed into a solid film at room temperature, and further, the adhesive 6 is a tape-like film. In one embodiment, the single layer of adhesive is wound around the plastic tube to a thickness of 0.8-1.0mm, and the adhesive is wound to an overlap ratio of 50% -70%, i.e. the approximate thickness value of the first thickness region 61 is 0.8-1.0mm, and the approximate thickness value of the second thickness region is 1.6-2.0 mm.
The inner wall of the steel pipe and the outer wall of the plastic pipe have a first distance H3, the first distance H3 is a continuously variable value, and the first distance H3 comprises an average thickness H1 of the first thickness area and an average value H2 of the second thickness area which are correspondingly equal.
In one embodiment, the lining plastic has a thickness of 1.5mm + -0.2mm, the average thickness H1 of the first thickness region is 1.6mm + -0.4, the approximate thickness of the second thickness region 62 is 0.8mm + -0.2, and the nominal diameter DN of the steel pipe is 15-65 mm.
In one embodiment, the lining plastic has a thickness of 2mm + -0.2mm, the average thickness H1 of the first thickness region is 1.6mm + -0.4, the approximate thickness of the second thickness region 62 is 0.8mm + -0.2, and the nominal diameter DN of the steel pipe is 80-125 mm.
In one embodiment, the thickness of the lining plastic is 2.5-3mm, the average thickness H1 of the first thickness region is 1.6mm + -0.4, the approximate thickness value of the second thickness region 62 is 0.8mm + -0.2, and the nominal diameter DN of the steel pipe is 250-400 mm.
As one embodiment, the manufacturing method of the steel-plastic composite pipe with the inner lining and the outer coating comprises the following steps: 1) providing a steel pipe 4 and a plastic pipe 2, and winding the adhesive 6 on the outer wall of the plastic pipe 2 after being made into a strip shape; 2) extruding the plastic pipe 2 wound with the adhesive 6 into a steel pipe 4; 3) sealing the two ends of the steel pipe 4, heating, pressurizing, liquefying the adhesive at high temperature, and making the plastic pipe 2 expand and deform to be tightly bonded with the steel pipe 4 at high pressure.
It can be understood by those skilled in the art that the method of the embodiment of the present application is not limited to the plastic pipe 2 and the steel pipe 4, and can be applied to any pipe material that needs to be bonded by the adhesive 6, and the melting temperature of the pipe material is higher than the liquefaction temperature of the adhesive, so that the method of the embodiment can be used to manufacture the composite pipe.
In the embodiment of step 1), the strip-shaped adhesive 6 may be spirally wound around the plastic tube 2 in a partially overlapped manner, and further, the plastic tube 2 may be spirally wound on the outer circumference in a manner that all the plastic tubes are overlapped and the overlapped areas are equal. The outer surface of the plastic pipe 2 is completely wrapped with the adhesive 6.
As a comparative example: when the liquid adhesive is coated on the outer wall of the plastic pipe and then inserted into the steel pipe, the liquid adhesive flows downwards to be partially lost, the liquid adhesive is easy to scratch on the steel pipe, and the situation that the plastic pipe and the steel pipe are not firmly adhered and crack due to the loss of the adhesive can occur.
In one embodiment, the plastic tube 2 is made of polyethylene or cross-linked polyethylene, the adhesive 6 is hot-melt adhesive, and the adhesive is first processed into a band shape during the application process, and the thickness of the band-shaped adhesive is 0.8-1 mm. The material of the adhesive may be selected from at least one of polyvinyl acetate, polyvinyl acetal, ethylene-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate copolymer resin, perchloroethylene resin, polyacrylate, polyamide, polysulfone, and maleic anhydride graft adhesive.
In one embodiment, as a winding method of the adhesive 6, the tape-like adhesive at the end of the plastic pipe 2 is wound with being overlapped by one half, and the tape-like adhesive 6 at the middle of the plastic pipe 2 is wound with being overlapped by one half or one third. The winding mode enables the plastic pipe 2 and the steel pipe 4 to have good tight connection.
In another embodiment, the process of bonding a plastic pipe and a steel pipe using a thermoplastic adhesive comprises the steps of: A. sealing two ends of a steel pipe of the plastic pipe internally provided with the wound adhesive, inflating and pressurizing the interior of the steel pipe, inflating by using an air compressor, heating the outer wall of the steel pipe, keeping the pressure at 400-600kPa, and keeping for 20-40 min; B. heating to melt the adhesive, wherein the heating method is to heat the steel pipe from the middle to the two ends and can discharge gas included in the adhesive; C. and D, exhausting the steel pipe prepared in the step B, and cooling to obtain the composite pipeline. The steel pipe of the prepared lining plastic steel pipe is closely contacted with the lining without cracking.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (6)
1. A method of manufacturing a composite pipe, comprising:
providing a first pipe and a second pipe, wherein the first pipe is a plastic pipe, and the second pipe is a metal pipe;
the outer diameter of the plastic pipe is slightly smaller than the inner diameter of the metal pipe;
curing and molding the adhesive, winding the adhesive on the outer wall of the first pipe, and extruding the first pipe wound with the adhesive into the second pipe;
liquefying the adhesive and bonding the first tube to the second tube;
the adhesive is cured and formed by making the adhesive into a film, and the winding method is at least partially overlapped and spirally wound;
the spirally wound adhesive comprises a first thickness region and a second thickness region, the first thickness region being in a spiral shape around the plastic tube, the second thickness region being in a spiral shape disposed adjacent to the first thickness region;
the thickness of the single-layer adhesive wound on the plastic pipe is 0.8-1.0mm, and the winding overlapping rate of the adhesive is 50-70%;
the adhesive is a hot melt adhesive;
the step of liquefying the adhesive comprises: the metal pipe is rotated and heated from the middle to both ends of the metal pipe, so that the hot melt adhesive is melted, and the first pipe and the second pipe are bonded after cooling.
2. The manufacturing method according to claim 1, wherein the second pipe is a steel pipe.
3. The method of manufacturing of claim 2, wherein the step of liquefying the adhesive comprises: and (3) sealing two ends of the metal pipe, pressurizing and heating the hot-melt adhesive in the metal pipe, keeping for a period of time, exhausting and cooling the metal pipe, and thus obtaining the composite pipeline.
4. The method as claimed in claim 3, wherein the pressure in the metal tube is 400 kPa to 600kPa for 20 to 40 min.
5. The method of claim 1, wherein the binder is selected from the group consisting of polyvinyl acetate, polyvinyl acetal, ethylene-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate copolymer resin, perchloroethylene resin, polyacrylate, polyamide, polysulfone, and maleic anhydride graft binder.
6. A composite pipe, characterized by being manufactured by the manufacturing method of any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811234092.4A CN109323052B (en) | 2018-10-23 | 2018-10-23 | Composite pipeline and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811234092.4A CN109323052B (en) | 2018-10-23 | 2018-10-23 | Composite pipeline and manufacturing method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN109323052A CN109323052A (en) | 2019-02-12 |
| CN109323052B true CN109323052B (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811234092.4A Expired - Fee Related CN109323052B (en) | 2018-10-23 | 2018-10-23 | Composite pipeline and manufacturing method thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1673596A (en) * | 2005-03-17 | 2005-09-28 | 甘国工 | Method and apparatus for producing steel-plastic composite pipe |
| CN202746796U (en) * | 2012-09-24 | 2013-02-20 | 天津市富顺钢管镀锌有限公司 | Water supply plastic-lined composite galvanized steel pipe |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004067269A2 (en) * | 2003-01-31 | 2004-08-12 | Horst Bonn | Plastic-metal composite pipe comprising a metallic double envelope and method and device for producing the same |
| CN1569452A (en) * | 2003-07-18 | 2005-01-26 | 成都帝拓管业科技开发有限公司 | Method for manufacturing lining plastic composite carbon steel pipe |
| CN103672211B (en) * | 2013-12-31 | 2016-06-15 | 湖南振辉管业有限公司 | A kind of lining plastic spipot and socket cast iron pipe and manufacturing process thereof |
| CN106594406B (en) * | 2017-02-16 | 2017-11-21 | 湖南振辉管业有限公司 | A kind of inner lining plastic tube cast iron pipe and its manufacture method |
| US9958103B1 (en) * | 2017-06-19 | 2018-05-01 | Patagonia Shale Services S.A. | Internal anticorrosive and abrasive resistant protection coating for steel pipes |
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2018
- 2018-10-23 CN CN201811234092.4A patent/CN109323052B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1673596A (en) * | 2005-03-17 | 2005-09-28 | 甘国工 | Method and apparatus for producing steel-plastic composite pipe |
| CN202746796U (en) * | 2012-09-24 | 2013-02-20 | 天津市富顺钢管镀锌有限公司 | Water supply plastic-lined composite galvanized steel pipe |
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| CN109323052A (en) | 2019-02-12 |
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