CN110131511B - RTP pipe electric melting and hot melting unchanged-size connecting structure and connecting method thereof - Google Patents
RTP pipe electric melting and hot melting unchanged-size connecting structure and connecting method thereof Download PDFInfo
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- CN110131511B CN110131511B CN201910414812.3A CN201910414812A CN110131511B CN 110131511 B CN110131511 B CN 110131511B CN 201910414812 A CN201910414812 A CN 201910414812A CN 110131511 B CN110131511 B CN 110131511B
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- 238000002844 melting Methods 0.000 title claims abstract description 71
- 230000008018 melting Effects 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000003365 glass fiber Substances 0.000 claims abstract description 78
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000010410 layer Substances 0.000 claims description 49
- 239000012943 hotmelt Substances 0.000 claims description 13
- 238000010276 construction Methods 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 3
- 239000011241 protective layer Substances 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 abstract description 11
- 239000002131 composite material Substances 0.000 abstract description 4
- 239000004698 Polyethylene Substances 0.000 description 85
- 229920000573 polyethylene Polymers 0.000 description 85
- 238000003466 welding Methods 0.000 description 21
- 239000012530 fluid Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- -1 Polyethylene Polymers 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 230000012782 tube fusion Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/02—Welded joints; Adhesive joints
Abstract
The invention relates to an RTP pipe electric melting and hot melting unchanged-size connecting structure and a connecting method thereof, wherein the connecting structure comprises a first RTP pipe, a second RTP pipe and a glass fiber reinforced PE sleeve which are in butt joint, wherein a section of pre-melting section is reserved at the end part of the PE inner pipe of the first RTP pipe outwards along the axial direction; the second RTP pipe has the same structure as the first RTP pipe; the length of the glass fiber reinforced PE sleeve is equal to twice of the premelting section, the outer diameter of the glass fiber reinforced PE sleeve is the same as the outer diameter of the RTP pipe, and a heating coil or a self-heating melting material is embedded in the glass fiber reinforced PE sleeve; the premelting sections of the first RTP pipe and the second RTP pipe are oppositely inserted into the glass fiber reinforced PE sleeve, and the outer surface of the premelting sections and the inner surface of the glass fiber reinforced PE sleeve are welded together through electric melting or hot melting. The invention realizes the connection of PE inner pipes, improves the strength of the connection part of the pipelines, ensures the safety of pipeline transportation, does not change the size of the connection part, improves the safety coefficient of the design of a composite material pipeline system, and promotes the mass industrialized application process of RTP pipelines.
Description
Technical Field
The invention relates to the technical field of application of high polymer and composite material pipelines, in particular to an electric melting and hot melting connection structure of an RTP pipe without changing the size and a connection method thereof.
Background
The Reinforced Thermoplastic Pipe (RTP) comprises a three-layer structure, wherein the inner layer is a corrosion-resistant layer of Polyethylene (PE), the middle layer is a high-strength continuous fiber reinforced layer, and the outer layer is a protective layer of PE. The production process includes extruding inner layer High Density Polyethylene (HDPE) pipe, winding four filament bundles with winding machine to form continuous fiber reinforced pre-soaking belt, and extruding to cover the outer protecting layer.
Currently accepted RTP pipe connection methods include electric hot melting connection and metal mechanical sealing connection. The electric hot melt connection method commonly used in the prior art adopts hot melt butt joint or sleeving an electric hot melt joint for secondary welding after butt joint to increase strength, but the welding strength of the hot melt butt joint has close relationship with a welding line, and more technological parameters influencing the welding strength are provided; the electric welding joint can increase the connection strength of the pipeline, but can greatly increase the size of the connection part, which is not beneficial to construction.
Disclosure of Invention
Aiming at the problems of low strength, easy corrosion, small high pressure resistance, excessive outer diameter increase and the like of the RTP pipeline connecting part in the prior art, the invention provides the RTP pipeline electric melting and hot melting connecting structure and the connecting method thereof, which have reasonable design, are convenient to construct, can provide enough strength, ensure the pipeline transportation safety and do not change the size of the connecting part.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides an RTP pipe electric smelting hot melt invariant dimension connection structure, includes first RTP pipe and the second RTP pipe that carries out the butt joint, first RTP pipe is three layer construction, includes PE inner tube, continuous fiber enhancement layer and PE skin in proper order from inlayer to skin, the PE inner tube tip of first RTP pipe is along the outside reservation one section premelting section of axial; the structure of the second RTP pipe is the same as that of the first RTP pipe; the connecting structure further comprises a glass fiber reinforced PE sleeve, the length of the glass fiber reinforced PE sleeve is equal to twice the length of the pre-melting section of the RTP pipe, the outer diameter of the glass fiber reinforced PE sleeve is the same as the outer diameter of the RTP pipe, the inner diameter of the glass fiber reinforced PE sleeve is 1-4mm larger than the outer diameter of the PE inner pipe of the RTP pipe, and a heating coil is embedded in the glass fiber reinforced PE sleeve or a self-melting material is added in the glass fiber reinforced PE sleeve; the premelting sections of the first RTP pipe and the second RTP pipe are oppositely inserted into the glass fiber reinforced PE sleeve, and the outer surface of the premelting sections and the inner surface of the glass fiber reinforced PE sleeve are welded together through electric melting or hot melting.
In the scheme, the surface of the premelting section of the PE inner pipe is polished to be flat.
In the scheme, the length of the premelting section of the PE inner tube is 50-100mm.
In the scheme, the glass fiber reinforced PE sleeve is of a three-layer structure and comprises an inner layer, a middle layer and an outer layer, and matrix materials used in the three-layer structure are all ultra-high molecular weight PE; the inner layer of the glass fiber reinforced PE sleeve is pre-embedded with a heating coil or is added with a self-heating melting material.
In the above scheme, the middle layer of the glass fiber reinforced PE sleeve is a glass fiber reinforced layer, and is manufactured by winding and forming a continuous glass fiber reinforced PE prepreg tape, wherein the winding angle is 0-90 degrees.
In the scheme, the outer layer of the glass fiber reinforced PE sleeve is a PE anti-corrosion protection layer, and a small binding post is arranged on the surface of the glass fiber reinforced PE sleeve and used for electrifying.
In the scheme, the heating temperature of the first RTP pipe and the second RTP pipe in the electric melting or hot melting connection process is between 180 ℃ and 240 ℃, the preheating pressure is between 0.10MPa and 0.20MPa, and the melting pressure is between 0.01MPa and 0.05MPa.
The invention also provides a connection method of the RTP pipe electric melting and hot melting unchanged-size connection structure, which comprises the following steps:
(1) Stripping the PE inner tube by using a special machine to expose a section of premelting section with preset length; or controlling the process when manufacturing the RTP pipe, and reserving PE inner pipe premelting sections with certain lengths at the two ends of the RTP pipe;
(2) The premelting section is processed, the end face is cut flat, and the surface is polished smooth;
(3) The end parts of the PE inner pipes exposed by the two RTP pipes are inserted into the glass fiber reinforced PE sleeve, so that the end surfaces of the inner pipe melting sections of the two RTP pipes are closely contacted in the middle of the glass fiber reinforced PE sleeve;
(4) And electrifying the glass fiber reinforced PE sleeve, wherein the inner side of the glass fiber reinforced PE sleeve and the outer side of the PE inner pipe are heated and melted, the electrifying time is 30-60s, after the electrifying is stopped, the joint is sleeved by the sleeve, the glass fiber reinforced PE sleeve is pressurized, and after 60s, the sleeve is removed.
The method is characterized in that two butt end surfaces of the two RTP pipes which are in butt joint in the step (3) are fixed on a clamping station in opposite directions, and the clamping station is adjusted to enable the two RTP pipes to be coaxial, so that the deviation is not more than 5%.
In the method, the heating temperature in the electric melting or hot melting connection process in the step (4) is 180-240 ℃, the preheating pressure is 0.10-0.20 MPa, and the melting pressure is 0.01-0.05 MPa.
The invention has the beneficial effects that:
the RTP pipe connecting structure designed by the invention does not carry out butt welding on the two RTP pipes, no welding seam is generated at the joint, the inner diameter of the RTP pipe is unchanged, and the fluid in the pipe does not have physical obstruction when flowing through the joint. At the same time, the fluid does not accumulate at the interface, causing a partial blockage. The welding contact surface of the glass fiber reinforced PE sleeve and the two RTP pipes is large, and the welding strength is enough. After the welding is finished, the strength is close to that of the RTP pipe body. After the welding is finished, the size of the joint part is basically consistent with that of the RTP pipe body, the appearance is attractive, and the construction is convenient. Because the size is unchanged, the pipeline damage on-line monitoring is more accurate, and automatic cleaning and detecting equipment such as a pipeline robot and the like can also conveniently operate. And other materials are hardly introduced, the integrity of the pipeline is good, and the welding cost is low.
The electric melting and hot melting connection method is improved on the conventional hot melting butt joint method, PE inner pipes of two RTP pipes to be connected are firstly stripped, then a special glass fiber reinforced PE sleeve is sleeved, and the electric melting and hot melting connection position is changed from butt joint to heating between the inner pipes of the RTP pipes and the glass fiber reinforced PE sleeve. The connection position and the mode are changed, the welding area is obviously increased, and the two RTP pipes and the glass fiber reinforced PE sleeve are fully welded by applying pressure. After cooling and forming, the tensile strength, bending strength and compressive strength of the joint are all higher than the strength of the pipe, and the connecting effect is good. The connection method of the invention realizes the connection of PE inner pipes, has reasonable design, is convenient for construction, improves the strength of the connection part of the pipeline, ensures the safety of pipeline transportation, does not change the size of the connection part, greatly improves the safety coefficient of the design of the composite material pipeline system, and promotes the mass industrialized application process of RTP pipelines.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic view of the structure of an RTP pipe with a pre-melted section reserved in the invention;
FIG. 2 is an exploded view of an RTP tube electrofusion hot melt constant dimension connection structure of the present invention;
fig. 3 is an assembled view of fig. 2.
In the figure: 10. a first RTP pipe; 11. a PE inner tube; 111. a pre-melting section; 12. a continuous fiber reinforcement layer; 13. a PE outer layer; 20. a second RTP pipe; 30. glass fiber reinforced PE sleeve.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
Referring to fig. 1-3, an RTP tube electrofusion and hot-melt constant-size connection structure according to a preferred embodiment of the invention includes a first RTP tube 10 and a second RTP tube 20 that are butted together, wherein the first RTP tube 10 has a three-layer structure, and sequentially includes, from an inner layer to an outer layer, a PE inner tube 11, a continuous fiber reinforcement layer 12, and a PE outer layer 13, wherein a pre-melted section 111 of a preset length is exposed axially and outwardly from the end of the PE inner tube 11. The second RTP pipe 20 has the same structure as the first RTP pipe 10, and the pre-melting section 111 has the same length. The connecting structure further comprises a glass fiber reinforced PE sleeve 30, the length of the glass fiber reinforced PE sleeve 30 is equal to twice the length of the pre-melting section 111 of the RTP pipe, the outer diameter of the glass fiber reinforced PE sleeve 30 is the same as the outer diameter of the RTP pipe, the inner diameter of the glass fiber reinforced PE sleeve 30 is 1-4mm larger than the outer diameter of the PE inner pipe 11 of the RTP pipe, and a heating coil is embedded in the glass fiber reinforced PE sleeve 30 or a self-melting material is added in the glass fiber reinforced PE sleeve 30. The pre-melting section 111 of the first RTP pipe 10 and the second RTP pipe 20 are oppositely inserted into the glass fiber reinforced PE sleeve 30, the end surfaces are in close contact, and the outer surface of the pre-melting section 111 and the inner surface of the glass fiber reinforced PE sleeve 30 are welded together through electric melting and hot melting. The structural design can ensure that the size of the welded pipe joint is not changed, and is convenient for construction.
Further preferably, in this embodiment, the surface of the premelting section 111 of the PE inner tube 11 is polished to make the surface flat, so as to facilitate the seamless fit with the glass fiber reinforced PE sleeve 30.
Further preferably, in this embodiment, the length of the premelted section 111 of the PE inner tube 11 is 50-100mm.
In the connecting structure, the two RTP pipes are not subjected to butt welding, a welding line is not generated at the joint, the inner diameter of each RTP pipe is unchanged, and fluid in the pipe does not have physical obstruction when flowing through the joint. At the same time, the fluid does not accumulate at the interface, causing a partial blockage. The welding contact surface of the glass fiber reinforced PE sleeve and the two RTP pipes is large, and the welding strength is enough. After the welding is finished, the strength is close to that of the RTP pipe body. After the welding is finished, the size of the joint part is basically consistent with that of the RTP pipe body, the appearance is attractive, and the construction is convenient. Because the size is unchanged, the pipeline damage on-line monitoring is more accurate, and automatic cleaning and detecting equipment such as a pipeline robot and the like can also conveniently operate. And other materials are hardly introduced, the integrity of the pipeline is good, and the welding cost is low.
Further preferably, in this embodiment, the glass fiber reinforced PE sleeve 30 has a three-layer structure including an inner layer, an intermediate layer and an outer layer, and the matrix materials used in the three-layer structure are all ultra-high molecular weight PEs. The inner layer of the glass fiber reinforced PE sleeve 30 is pre-embedded with heating coils or is added with a self-heating material, and specifically, the self-heating material is a conductive material made of polyethylene and carbon black/metal powder and can generate heat when electrified. The middle layer of the glass fiber reinforced PE sleeve 30 is a glass fiber reinforced layer, and is manufactured by winding and forming a continuous glass fiber reinforced PE prepreg tape, wherein the winding angle is 0-90 degrees. The outer layer of the glass fiber reinforced PE sleeve 30 is a PE anti-corrosion protective layer, and a small binding post is arranged on the surface of the PE sleeve for electrifying, so that the appearance and the size of a pipeline are hardly affected.
Further preferably, in this embodiment, the heating temperature of the first RTP tube 10 and the second RTP tube 20 in the electric melting or hot melting connection process is between 180 ℃ and 240 ℃, the preheating pressure is between 0.10MPa and 0.20MPa, and the melting pressure is between 0.01MPa and 0.05MPa. The pressure is applied by adding a pipe hoop (pipe sleeve) outside the glass fiber reinforced PE sleeve 30, a pressure sensor is connected inside the pipe hoop, and the glass fiber reinforced PE sleeve 30 inside the pipe hoop is pressurized by screwing a screw on the pipe hoop, so that the preheating pressure and the melting pressure are controlled. In this process, the glass fiber reinforced PE sleeve 30 is connected with the RTP pipe, and the pipe hoop (sleeve) is removed after the connection is completed.
The invention also provides a connection method of the RTP pipe electric melting and hot melting unchanged-size connection structure, which comprises the following steps:
(1) The outer layer and the middle layer of the RTP pipe are polished clean by using an annular polisher, and the PE inner pipe 11 is peeled off, so that a section of premelt section 111 with a preset length is exposed from the PE inner pipe 11. Or controlling the process when manufacturing the RTP pipe, and reserving a pre-melting section 111 of the PE inner pipe 11 with a certain length at two ends of the RTP pipe.
(2) The premelt section 111 is treated, the end face cut flat and the surface polished smooth.
(3) The ends of the two RTP tubes exposing the PE inner tube 11 are inserted into the glass fiber reinforced PE sleeve 30 so that the end surfaces of the inner tube fusion sections of the two RTP tubes are in contact inside the middle of the glass fiber reinforced PE sleeve 30.
(4) And electrifying the glass fiber reinforced PE sleeve 30, wherein the inner side of the glass fiber reinforced PE sleeve 30 and the outer side of the PE inner pipe 11 are heated and melted, the electrifying time is 30-60s, after the electrifying is stopped, the joint is sleeved by using the sleeve, the glass fiber reinforced PE sleeve is pressurized, and after 60s, the sleeve is removed.
And (3) fixing two butt end surfaces of the two RTP pipes in butt joint in the step (3) on a clamping station in opposite directions, and adjusting the clamping station to enable the two RTP pipes to be coaxial, wherein the deviation is not more than 5%.
In the step (4), the heating temperature in the electric melting or hot melting connection process is 180-240 ℃, the preheating pressure is 0.10-0.20 MPa, and the melting pressure is 0.01-0.05 MPa.
The electric melting and hot melting connection method designed by the invention is improved on the conventional hot melting butt joint method, the PE inner pipe 11 of the two RTP pipes to be connected is firstly stripped, then the special glass fiber reinforced PE sleeve 30 is sleeved, and the electric melting and hot melting connection position is changed from butt joint between the two RTP pipe end surfaces to heating between the RTP pipe inner pipe and the glass fiber reinforced PE sleeve 30. The connection position and mode are changed, the welding area is obviously increased, and the two RTP pipes are fully welded with the glass fiber reinforced PE sleeve 30 by applying pressure. After cooling and forming, the tensile strength, bending strength and compressive strength of the joint are all higher than the strength of the pipe, and the connecting effect is good. The connection method of the invention realizes the connection of PE inner pipes 11, has reasonable design, is convenient for construction, improves the strength of the connection part of the pipeline, ensures the safety of pipeline transportation, does not change the size of the connection part, greatly improves the safety coefficient of the design of the composite material pipeline system, and promotes the mass industrialized application process of RTP pipelines.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (7)
1. The utility model provides an RTP pipe electric smelting hot melt invariant dimension connection structure, includes the first RTP pipe and the second RTP pipe that dock, first RTP pipe is three layer construction, includes PE inner tube, continuous fiber enhancement layer and PE skin in proper order from inlayer to skin, its characterized in that, the PE inner tube tip of first RTP pipe reserves one section premelting section outwards along the axial; the structure of the second RTP pipe is the same as that of the first RTP pipe; the connecting structure further comprises a glass fiber reinforced PE sleeve, the length of the glass fiber reinforced PE sleeve is equal to twice the length of the pre-melting section of the RTP pipe, the outer diameter of the glass fiber reinforced PE sleeve is the same as the outer diameter of the RTP pipe, the inner diameter of the glass fiber reinforced PE sleeve is 1-4mm larger than the outer diameter of the PE inner pipe of the RTP pipe, and a heating coil is embedded in the glass fiber reinforced PE sleeve or a self-melting material is added in the glass fiber reinforced PE sleeve; the premelting sections of the first RTP pipe and the second RTP pipe are oppositely inserted into the glass fiber reinforced PE sleeve, and the outer surface of the premelting sections and the inner surface of the glass fiber reinforced PE sleeve are welded by electric melting or hot melting;
the glass fiber reinforced PE sleeve is of a three-layer structure and comprises an inner layer, an intermediate layer and an outer layer, and matrix materials used in the three-layer structure are all ultra-high molecular weight PE; the inner layer of the glass fiber reinforced PE sleeve is pre-embedded with a heating coil or added with a self-heating melting material; the middle layer of the glass fiber reinforced PE sleeve is a glass fiber reinforced layer, and is manufactured by winding and forming a continuous glass fiber reinforced PE prepreg tape, wherein the winding angle is 0-90 degrees; the outer layer of the glass fiber reinforced PE sleeve is a PE anti-corrosion protective layer, and a small binding post is arranged on the surface of the glass fiber reinforced PE sleeve for electrifying.
2. The RTP tube electrofusion and hot-melt constant-size connection structure according to claim 1, wherein the surface of the premelted section of the PE inner tube is polished to make the surface flat.
3. The RTP tube electrofusion hot-melt constant size connection structure according to claim 1, wherein the length of the pre-melted section of the PE inner tube is 50-100mm.
4. The RTP tube electrofusion and hot melt constant size connection structure according to claim 1, wherein the heating temperature of the first RTP tube and the second RTP tube in the electrofusion or hot melt connection process is between 180 ℃ and 240 ℃, the preheating pressure is between 0.10MPa and 0.20MPa, and the melting pressure is between 0.01MPa and 0.05MPa.
5. A method of connecting an RTP tube electrofusion hot-melt constant size connection structure according to claim 1 comprising the steps of:
(1) Stripping the PE inner tube by using a special machine to expose a section of premelting section with preset length; or controlling the process when manufacturing the RTP pipe, and reserving PE inner pipe premelting sections with certain lengths at the two ends of the RTP pipe;
(2) The premelting section is processed, the end face is cut flat, and the surface is polished smooth;
(3) The end parts of the PE inner pipes exposed by the two RTP pipes are inserted into the glass fiber reinforced PE sleeve, so that the end surfaces of the inner pipe melting sections of the two RTP pipes are closely contacted in the middle of the glass fiber reinforced PE sleeve;
(4) And electrifying the glass fiber reinforced PE sleeve, wherein the inner side of the glass fiber reinforced PE sleeve and the outer side of the PE inner pipe are heated and melted, the electrifying time is 30-60s, after the electrifying is stopped, the joint is sleeved by the sleeve, the glass fiber reinforced PE sleeve is pressurized, and after 60s, the sleeve is removed.
6. The method for connecting an electric melting and hot melting constant size connecting structure of RTP pipes according to claim 5, wherein the two butt end surfaces of the two RTP pipes butt in the step (3) are fixed on a clamping station in opposite directions, and the clamping station is adjusted to enable the two RTP pipes to be coaxial, and the deviation is not more than 5%.
7. The method for connecting an RTP pipe electric-melting and hot-melting unchanged-size connecting structure according to claim 5, wherein the heating temperature in the electric-melting or hot-melting connecting process in the step (4) is 180-240 ℃, the preheating pressure is 0.10-0.20 MPa, and the melting pressure is 0.01-0.05 MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910414812.3A CN110131511B (en) | 2019-05-17 | 2019-05-17 | RTP pipe electric melting and hot melting unchanged-size connecting structure and connecting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910414812.3A CN110131511B (en) | 2019-05-17 | 2019-05-17 | RTP pipe electric melting and hot melting unchanged-size connecting structure and connecting method thereof |
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| CN110131511A CN110131511A (en) | 2019-08-16 |
| CN110131511B true CN110131511B (en) | 2024-01-02 |
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| CN112454915A (en) * | 2019-09-09 | 2021-03-09 | 上海亚大塑料制品有限公司 | Butt welding method for polyethylene-coated pipelines |
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| CN111637304B (en) * | 2020-06-02 | 2021-07-13 | 内蒙古华塑节水灌溉科技有限公司 | Integrated connection self-melting PE pipe |
| CN111765316B (en) * | 2020-06-24 | 2021-04-13 | 山东鑫隆管业有限公司 | Reinforcing device and reinforcing method for antibacterial water pipe joint |
| WO2022020301A1 (en) | 2020-07-20 | 2022-01-27 | Saudi Arabian Oil Company | Apparatus and method for electrofusion welding of reinforced thermosetting resin pipe joints |
| US11794418B2 (en) | 2020-07-20 | 2023-10-24 | Saudi Arabian Oil Company | Apparatus and method for threaded-welded reinforced thermosetting resin pipe joints |
| US11754215B2 (en) | 2020-07-20 | 2023-09-12 | Saudi Arabian Oil Company | Apparatus and method for friction welding of reinforced thermosetting resin pipe joints |
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| CN210566916U (en) * | 2019-05-17 | 2020-05-19 | 武汉海威船舶与海洋工程科技有限公司 | RTP pipe electric smelting hot melt does not change size connection structure |
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