CN107956949B - Steel-plastic adapter for heavy-duty gas and manufacturing method thereof - Google Patents
Steel-plastic adapter for heavy-duty gas and manufacturing method thereof Download PDFInfo
- Publication number
- CN107956949B CN107956949B CN201711376639.XA CN201711376639A CN107956949B CN 107956949 B CN107956949 B CN 107956949B CN 201711376639 A CN201711376639 A CN 201711376639A CN 107956949 B CN107956949 B CN 107956949B
- Authority
- CN
- China
- Prior art keywords
- section
- pipe
- pipe body
- diameter
- metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229920003023 plastic Polymers 0.000 title claims abstract description 80
- 239000004033 plastic Substances 0.000 title claims abstract description 80
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000002184 metal Substances 0.000 claims abstract description 130
- 229910052751 metal Inorganic materials 0.000 claims abstract description 130
- 239000004698 Polyethylene Substances 0.000 claims abstract description 80
- 229920000573 polyethylene Polymers 0.000 claims abstract description 80
- 238000007789 sealing Methods 0.000 claims abstract description 76
- -1 polyethylene Polymers 0.000 claims abstract description 74
- 238000005260 corrosion Methods 0.000 claims abstract description 24
- 239000004831 Hot glue Substances 0.000 claims description 42
- 229910000831 Steel Inorganic materials 0.000 claims description 34
- 239000010959 steel Substances 0.000 claims description 34
- 238000004804 winding Methods 0.000 claims description 23
- 229920001903 high density polyethylene Polymers 0.000 claims description 15
- 239000004700 high-density polyethylene Substances 0.000 claims description 15
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 15
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 15
- 238000003754 machining Methods 0.000 claims description 15
- 239000000155 melt Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- 239000003431 cross linking reagent Substances 0.000 claims description 9
- 150000002978 peroxides Chemical class 0.000 claims description 9
- 230000007797 corrosion Effects 0.000 claims description 8
- 238000001746 injection moulding Methods 0.000 claims description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 5
- 150000002825 nitriles Chemical class 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000006353 environmental stress Effects 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 230000035882 stress Effects 0.000 claims description 3
- 238000007514 turning Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims 6
- 239000011247 coating layer Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 12
- 239000002737 fuel gas Substances 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 6
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical group C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920006334 epoxy coating Polymers 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 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
- F16L47/20—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics
- F16L47/24—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics for joints between metal and plastics pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
- C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
-
- 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
- F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
- F16L58/184—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
-
- 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
- F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
- F16L58/185—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for joints with sleeve or socket
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention relates to a steel-plastic adapter for heavy-duty fuel gas, wherein a front inserting section of a pipe body is inserted into a large-diameter pipe section, the outer wall of the front inserting section of the pipe body is in interference fit with the inner wall of the large-diameter pipe section, the right end face of the large-diameter pipe section is propped against the left end face of a limiting section in the pipe body, a plurality of annular barb structures are equidistantly arranged on the outer walls of the front section and the middle section of the front inserting section of the pipe body, a first annular sealing groove is formed in the outer wall of a tail section of the front inserting section of the pipe body, a first sealing ring is arranged in the first annular sealing groove, a second sealing ring is arranged between the end face of a small-diameter pipe section of a polyethylene plastic pipe and the end face of the front inserting section of the pipe body of a metal lining piece, a second sealing groove for placing the second sealing ring is formed in the end face of the front inserting section of the pipe body, and a metal outer sleeve is sleeved on the small-diameter pipe section. The invention has the beneficial effects that: the anti-corrosion coating has more excellent anti-corrosion effect, and the same service life as that of a polyethylene pipeline is perfectly realized.
Description
Technical Field
The invention relates to the technical field of pipeline connectors, in particular to a steel-plastic adapter for heavy-duty fuel gas and a manufacturing method thereof.
Background
At present, in the field of fluid delivery such as fuel gas, metal pipelines such as steel pipes and Polyethylene (PE) plastic pipelines are common in medium-high pressure fluid delivery, and plastic pipelines are common in low-pressure fluid delivery; furthermore, for safety reasons, the state-relevant engineering regulations dictate that plastic pipes are not allowed to enter the end of the pipe directly-the user's room. Polyethylene (PE) steel-plastic adapters are often used in the transition from high pressure to low pressure pipelines and in the entry of plastic pipelines from garden pipes. The corrosion resistance of Polyethylene (PE) pipeline is very outstanding, its design life can be as long as 50 years, and its self corrosion resistance of steel pipe end of steel-plastic adapter matched with it is far from the requirement of Polyethylene (PE) pipe, and the steel-plastic adapter is mostly buried in moist underground or exposed in the air, so that its corrosion resistance requirement is very high.
The common steel-plastic conversion is usually to spray anti-corrosion materials such as epoxy resin or polyethylene on the outer part of the steel pipe end, so that the problem of falling of an anti-corrosion layer is very easy to occur due to the influence of factors such as collision and scratch in the processes of storage, transportation, installation and field use, and the anti-corrosion effect and the service life are not ideal. The prior engineering also adopts other multilayer reinforced anti-corrosion measures, and has the defects of complex working procedures, high construction requirement, incapability of simultaneously and reliably bonding anti-corrosion materials with a steel pipe and a Polyethylene (PE) pipe, and the like, so that various problems exist, and perfect unification is difficult to achieve in the aspects of anti-corrosion effect and economy.
The invention patent with application number 201210090942.4 discloses a reinforced anti-corrosion polyethylene steel-plastic adapter and a processing technology, which can solve the technical problems, but also has the following defects: 1. the inner circle of the metal lining piece is inconsistent with the inner circle of the polyethylene plastic pipe, so that the flow in the gas conveying process cannot be influenced by the change of the drift diameter. 2. The outside of the metal pipe fitting is provided with 5-8 inverted structures and 2-3 annular grooves for installing O-shaped sealing rings; the inverted buckle structure and the annular groove are positioned at the sleeving position of the polyethylene plastic pipe fitting and the metal pipe fitting; the annular grooves are positioned at the two sides of the sleeving part or at the two sides and the middle position, so that the sealing effect is poor. 3. A DH solvent-free epoxy coating with the thickness of 0.5+/-0.1 mm is required to be uniformly coated on the outer surface of the metal pipe fitting, so that the construction of the hot melt adhesive winding layer is affected.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the steel-plastic adapter for heavy-duty fuel gas and the manufacturing method thereof are provided, and perfect anti-corrosion effect is achieved through perfect sealing structure design between plastic and steel and mutual compatible anti-corrosion material selection.
The invention adopts the technical proposal for solving the problems that:
the utility model provides a steel plastic adapter for heavy duty gas, including polyethylene plastic pipe fitting 1, metal lining 2, metal outer tube 3, annular barb structure 4, first annular seal groove 5, first sealing washer 6, electrogalvanizing layer 7, hot melt adhesive winding layer 8, PEX heat shrink sleeve 9, second sealing washer 10 and second seal groove 11, polyethylene plastic pipe fitting 1 includes big diameter section 1.1 and the minor diameter section 1.2 of an organic whole setting, the internal diameter of big diameter section 1.1 is greater than the internal diameter of minor diameter section 1.2, the internal diameter of minor diameter section 1.2 equals with the internal diameter of metal lining 2, metal lining 2 is integrated into one piece and the body that the internal diameter is unanimous, it includes the body preceding insert section 2.1 of an organic whole setting, limit section 2.2 and body tail link section 2.3 in the body, limit section 2.2's both ends are connected with body preceding insert section 2.1, limit section 2.2 respectively in the body, the outer diameter of the limiting section 2.2 in the pipe body is larger than that of the front inserting section 2.1 of the pipe body, the front inserting section 2.1 of the pipe body is inserted into the large-diameter pipe section 1.1, the outer wall of the front inserting section 2.1 of the pipe body is in interference fit with the inner wall of the large-diameter pipe section 1.1, the right end face of the large-diameter pipe section 1.1 abuts against the left end face of the limiting section 2.2 in the pipe body, the outer diameter of the large-diameter pipe section 1.1 is larger than that of the limiting section 2.2 in the pipe body, a plurality of annular barb structures 4 are equidistantly arranged on the outer walls of the front section and the middle section of the front inserting section 2.1 of the pipe body, a first annular sealing groove 5 is formed in the outer wall of the tail section of the front inserting section 2.1 of the pipe body, a first sealing ring 6 is arranged in the first annular sealing groove 5, a second sealing ring 10 is arranged between the end face of the small-diameter pipe section 1.2 of the polyethylene plastic pipe fitting 1 and the end face of the front inserting section 2.1 of the metal lining piece 2, a second sealing ring 11 for placing in the second sealing ring 10 is formed in the end face of the front inserting section 2.1 of the pipe body, the small-diameter pipe section 1.2 is sleeved with a metal outer sleeve 3, and the outer walls of the limiting section 2.2, the pipe tail connecting section 2.3 and the metal outer sleeve 3 in the pipe body are provided with an electrogalvanizing layer 7.
The hot melt adhesive winding layer 8 comprises a hot melt adhesive tape, the winding range of the hot melt adhesive tape is the left end face of the large-diameter pipe section 1.1, the outer wall of the metal outer sleeve 3, the left end face of the large-diameter pipe section 1.1, the outer wall of the limiting section 2.2 in the pipe body and the outer wall of the pipe body tail connecting section 2.3, and the PEX heat shrinkage sleeve 9 is sleeved outside the hot melt adhesive winding layer 8.
The hot melt adhesive tape is polyethylene hot melt adhesive tape.
The polyethylene hot melt adhesive tape is formed by extruding polyethylene bonding resin and comprises 70% of HDPE, 20-25% of LLDPE, 1-3.5% of maleic anhydride, 0.1% of peroxide cross-linking agent and 0.1% of acetone; wherein the HDPE is high-density polyethylene, the tensile strength is more than or equal to 23Mpa, the elongation at break is more than or equal to 600%, the Vicat softening point is more than or equal to 120 ℃, and the melt flow rate is more than 1g/10 min; LLDPE is linear low-density polyethylene, the breaking tensile strength is more than or equal to 10Mpa, the breaking elongation is more than or equal to 1000%, the Vicat softening point is more than or equal to 95 ℃ and the melt flow rate is more than 20g/10 min.
The peroxide cross-linking agent is dicumyl peroxide.
The outer diameter of the limiting section 2.2 in the pipe body is larger than that of the pipe body tail connecting section 2.3, the left end face of the limiting section 2.2 in the pipe body is a plane, and the right end face of the limiting section 2.2 in the pipe body is a slope.
3-5 annular barb structures 4 are equidistantly arranged on the outer walls of the front section and the middle section of the front inserting section 2.1 of the pipe body.
The thickness of the outer wall of the large-diameter pipe section 1.1 is equal to that of the outer wall of the small-diameter pipe section 1.2.
The polyethylene plastic pipe fitting 1 is produced by injection molding of a high-strength P20 pre-hardening material mold.
The metal lining part 2 and the metal outer sleeve 3 are processed by using seamless steel pipes (45 # with the yield strength not less than 235 MPa.
The front inserting section 2.1 of the pipe body is pressed into the inner hole of the large-diameter pipe section 1.1 by a press machine in an interference fit mode.
The first sealing ring 6 and the second sealing ring 10 are nitrile sealing rings.
The inner circle part of the metal outer sleeve 3 is processed with taper of 0.9-1.1 degrees, and the axial size is slightly smaller than the length of the large-diameter pipe section 1.1 matched with the inner circle part.
The inner circle part of the metal outer sleeve 3 is in interference fit with the outer circle part of the large-diameter pipe section 1.1.
A manufacturing method of a steel-plastic adapter for heavy-duty fuel gas comprises the following steps:
1) Fitting preparation: blanking the metal lining member 2 and the metal outer sleeve 3 by using a sawing machine, selecting a seamless steel pipe I and a seamless steel pipe II for processing the metal lining member 2 and the metal outer sleeve 3, cutting the seamless steel pipe I and the seamless steel pipe II to a specified length size by using the sawing machine, and preparing for lathe finish machining; placing the blank of the polyethylene plastic pipe fitting 1 at normal temperature for not less than 20 days to ensure that the blank size is fully contracted and eliminate internal stress in the injection molding process;
2) And (3) fitting finish machining: finish machining the first seamless steel pipe and the second seamless steel pipe by a lathe; the method comprises the steps that a lathe is used for turning an outer circle of a seamless steel pipe to obtain a metal lining piece 2, the metal lining piece 2 is an integrally formed pipe body with the same inner diameter, the metal lining piece comprises a pipe body front inserting section 2.1, a pipe body middle limiting section 2.2 and a pipe body tail connecting section 2.3 which are integrally arranged, the outer diameter of the pipe body middle limiting section 2.2 is larger than that of the pipe body front inserting section 2.1, meanwhile, a lathe is used for machining a first annular sealing groove 5, an annular barb structure 4 and a second sealing groove 11 on the metal lining piece 2, the first annular sealing groove 5 is located on the outer wall of the tail section of the pipe body front inserting section 2.1, and the second sealing groove 11 is located on the end face of the pipe body front inserting section 2.1; using a lathe to manufacture a metal outer sleeve 3 for two outer circles and an inner circle of a seamless steel tube, wherein the inner circle part of the metal outer sleeve 3 is processed with a taper of 0.9-1.1 degrees; the inner round end of the polyethylene plastic pipe fitting blank is processed with an inclined chamfer to prepare the polyethylene plastic pipe fitting 1 which is convenient to assemble with the metal lining piece 2; the dimension machining tolerance of the fittings is controlled within +/-0.03 mm in order to ensure the assembly precision;
3) And (3) assembling: nitrile sealing rings are arranged in the first annular sealing groove 5 and the second sealing groove 11; the polyethylene plastic pipe fitting 1 and the metal lining part 2 are respectively placed on a hydraulic thrust machine, after the coaxial and collinear of the two parts are ensured, the two parts are clamped and fixed, the polyethylene plastic pipe fitting 1 and the metal outer sleeve 3 are axially pushed to the position of the limiting section 2.2 in the pipe body by means of hydraulic thrust, so that the tight interference fit and the dimensional accuracy requirements of the outer circle part of the metal lining part 2 and the inner circle part of the polyethylene plastic pipe fitting 1 matched with the metal lining part are ensured, the double effects of connecting the two materials and sealing are achieved, the inner circle sizes of the metal lining part 2 and the polyethylene plastic pipe fitting 1 are basically consistent after the press mounting is finished, and the flow is not influenced by the change of the diameter in the gas conveying process; the inner circle part of the metal outer sleeve 3 and the outer circle part of the polyethylene plastic pipe fitting 1 are pushed and matched by a hydraulic pushing machine to achieve the purpose of tight interference fit;
4) Processing the outer cladding layers of the metal lining piece 2, the metal outer sleeve 3 and the polyethylene plastic pipe fitting 1: the metal lining member 2 and the metal outer sleeve 3 after the electrogalvanizing and corrosion preventing treatment are subjected to surface cleaning treatment, oil stains, moisture and impurities are removed, high-temperature preheating is carried out at 170-190 ℃, then a polyethylene hot melt adhesive tape with the width of 40-50mm and the thickness of 0.5-0.8mm is wound tightly in a seamless mode according to a spiral lap joint mode, and the metal outer sleeve 3 and the metal lining member 2 are covered on the whole surface; and selecting a PEX heat shrinkage sleeve 9 with the tensile strength of more than or equal to 16MPa, the environmental stress cracking resistance time of more than or equal to 1000 hours and the corresponding width, and fully covering the metal part of the part which is pre-coated with the hot melt adhesive winding layer 8.
A special flame gun is adopted, the combustion temperature is controlled to be 270-360 ℃, and the outer surface of the PEX heat shrinkage sleeve 9 is sequentially heated according to the position; in order to ensure that the outer surface of the PEX heat-shrinkable sleeve is carbonized due to overhigh temperature, a mode of short period and repeated flyback heating is adopted, and the local continuous stay heating time is not more than 3s. The fully heated heat shrinkage sleeve is retracted when encountering heat, is tightly held at the outside of the hot melt adhesive, and further melts the polyethylene hot melt adhesive in the interior by the heat transferred by the PEX heat shrinkage sleeve, so that the upper and lower surfaces of the melted hot melt adhesive are respectively and fully welded with the heat shrinkage sleeve and the steel-plastic adapter steel pipe ends.
The polyethylene hot melt adhesive tape is formed by extruding special polyethylene bonding resin, and comprises the following raw materials in percentage by weight: 70% of HDPE, 20-25% of LLDPE, 1-3.5% of maleic anhydride, 0.1% of peroxide crosslinking agent and 0.1% of acetone; wherein the HDPE is high-density polyethylene, the tensile strength is more than or equal to 23Mpa, the elongation at break is more than or equal to 600%, the Vicat softening point is more than or equal to 120 ℃, and the melt flow rate is more than 1g/10 min; LLDPE is linear low-density polyethylene, the breaking tensile strength is more than or equal to 10Mpa, the breaking elongation is more than or equal to 1000%, the Vicat softening point is more than or equal to 95 ℃ and the melt flow rate is more than 20g/10 min.
The peroxide cross-linking agent is dicumyl peroxide.
The invention has the beneficial effects that: 1. through the perfect sealing structure design between the plastic end and the steel part, the selection of mutually compatible anti-corrosion materials and the unique treatment process, the invention ensures that the anti-corrosion material is directly buried underground or exposed in the air, has more excellent anti-corrosion effect than other similar products, and perfectly realizes the same service life as a polyethylene pipeline. 2. The inner circle of the metal lining piece is consistent with the inner circle of the polyethylene plastic pipe fitting in size, so that the flow in the gas conveying process can be prevented from being influenced by the change of the drift diameter. 3. The first annular sealing groove is formed in the outer wall of the tail section of the pipe body front insertion section, the first sealing ring is arranged in the first annular sealing groove, the second sealing ring is arranged between the end face of the small-diameter pipe section of the polyethylene plastic pipe fitting and the end face of the pipe body front insertion section of the metal lining piece, and the second sealing groove for placing the second sealing ring is formed in the end face of the pipe body front insertion section, so that the sealing effect is good. 3. The small-diameter pipe section is sleeved with the metal outer sleeve, and the limiting section, the pipe tail connecting section and the outer wall of the metal outer sleeve in the pipe body are provided with electrogalvanizing layers, so that the heat-conducting property is good, and the construction of the hot melt adhesive winding layer is not influenced. 4. The front inserting section of the pipe body is pressed into the inner hole of the large-diameter pipe section by a press machine in an interference fit mode, 3-5 annular barb structures are equidistantly arranged on the outer walls of the front section and the middle section of the front inserting section of the pipe body, and the number of the annular barb structures can be reduced by adopting the press mounting mode.
Drawings
FIG. 1 is a schematic view of a polyethylene plastic pipe fitting;
FIG. 2 is a metal liner;
FIG. 3 is a metal outer sleeve;
FIG. 4 is a schematic view of the assembled product;
fig. 5 is a partial enlarged view of fig. 4 at a.
The plastic pipe comprises a 1-polyethylene plastic pipe, a 1.1-large-diameter pipe section, a 1.2-small-diameter pipe section, a 2-metal lining piece, a 2.1-pipe body front insertion section, a 2.2-pipe body middle limit section, a 2.3-pipe body tail connection section, a 3-metal outer sleeve, a 4-annular barb structure, a 5-first annular sealing groove, a 6-first sealing ring, a 7-electrogalvanizing layer, an 8-hot melt adhesive winding layer, a 9-PEX heat shrinkage sleeve, a 10-second sealing ring and an 11-second sealing groove.
Detailed Description
Embodiments of the present invention are further described below with reference to the accompanying drawings.
Referring to fig. 1-5, the steel-plastic adapter for heavy-duty fuel gas in this embodiment comprises a polyethylene plastic pipe fitting 1, a metal lining member 2, a metal outer sleeve 3, an annular barb structure 4, a first annular seal groove 5, a first seal ring 6, an electrogalvanizing layer 7, a hot melt adhesive winding layer 8, a PEX heat shrink sleeve 9, a second seal ring 10 and a second seal groove 11, wherein the polyethylene plastic pipe fitting 1 comprises a large diameter pipe section 1.1 and a small diameter pipe section 1.2 which are integrally arranged, the inner diameter of the large diameter pipe section 1.1 is larger than the inner diameter of the small diameter pipe section 1.2, the inner diameter of the small diameter pipe section 1.2 is equal to the inner diameter of the metal lining member 2, the metal lining member 2 is an integrally formed pipe body with the same inner diameter, the steel-plastic adapter comprises an integrally arranged pipe body front insertion section 2.1, a pipe body middle limit section 2.2 and a pipe body tail connecting section 2.3, two ends of the limit section 2.2 are respectively connected with the pipe body front insertion section 2.1 and the pipe body middle limit section 2.2, the outer diameter of the limiting section 2.2 in the pipe body is larger than that of the front inserting section 2.1 of the pipe body, the front inserting section 2.1 of the pipe body is inserted into the large-diameter pipe section 1.1, the outer wall of the front inserting section 2.1 of the pipe body is in interference fit with the inner wall of the large-diameter pipe section 1.1, the right end face of the large-diameter pipe section 1.1 abuts against the left end face of the limiting section 2.2 in the pipe body, the outer diameter of the large-diameter pipe section 1.1 is larger than that of the limiting section 2.2 in the pipe body, a plurality of annular barb structures 4 are arranged on the outer walls of the front section and the middle section of the front inserting section 2.1 of the pipe body at equal intervals, a first annular sealing groove 5 is formed in the outer wall of the tail section of the front inserting section 2.1 of the pipe body, a first sealing ring 6 is arranged in the first annular sealing groove 5, a second sealing ring 10 is arranged between the end face of the small-diameter pipe section 1.2 of the polyethylene plastic pipe fitting 1 and the end face of the front inserting section 2.1 of the metal lining piece 2, the end face of the front inserting section 2.1 of the pipe body is provided with a second sealing groove 11 for placing a second sealing ring 10, the small-diameter pipe section 1.2 is sleeved with a metal outer sleeve 3, and the outer walls of the limiting section 2.2, the pipe body tail connecting section 2.3 and the metal outer sleeve 3 in the pipe body are provided with an electrogalvanizing layer 7.
The hot melt adhesive winding layer 8 comprises a hot melt adhesive tape, the winding range of the hot melt adhesive tape is the left end face of the large-diameter pipe section 1.1, the outer wall of the metal outer sleeve 3, the left end face of the large-diameter pipe section 1.1, the outer wall of the limiting section 2.2 in the pipe body and the outer wall of the pipe body tail connecting section 2.3, and the PEX heat shrinkage sleeve 9 is sleeved outside the hot melt adhesive winding layer 8.
The hot melt adhesive tape is polyethylene hot melt adhesive tape.
The polyethylene hot melt adhesive tape is formed by extruding polyethylene bonding resin and comprises 70% of HDPE, 20-25% of LLDPE, 1-3.5% of maleic anhydride, 0.1% of peroxide cross-linking agent and 0.1% of acetone; wherein the HDPE is high-density polyethylene, the tensile strength is more than or equal to 23Mpa, the elongation at break is more than or equal to 600%, the Vicat softening point is more than or equal to 120 ℃, and the melt flow rate is more than 1g/10 min; LLDPE is linear low-density polyethylene, the breaking tensile strength is more than or equal to 10Mpa, the breaking elongation is more than or equal to 1000%, the Vicat softening point is more than or equal to 95 ℃ and the melt flow rate is more than 20g/10 min.
The peroxide cross-linking agent is dicumyl peroxide.
The outer diameter of the limiting section 2.2 in the pipe body is larger than that of the pipe body tail connecting section 2.3, the left end face of the limiting section 2.2 in the pipe body is a plane, and the right end face of the limiting section 2.2 in the pipe body is a slope.
3-5 annular barb structures 4 are equidistantly arranged on the outer walls of the front section and the middle section of the front inserting section 2.1 of the pipe body.
The thickness of the outer wall of the large-diameter pipe section 1.1 is equal to that of the outer wall of the small-diameter pipe section 1.2.
The polyethylene plastic pipe fitting 1 is produced by injection molding of a high-strength P20 pre-hardening material mold.
The metal lining part 2 and the metal outer sleeve 3 are processed by using seamless steel pipes (45 # with the yield strength not less than 235 MPa.
The front inserting section 2.1 of the pipe body is pressed into the inner hole of the large-diameter pipe section 1.1 by a press machine in an interference fit mode.
The first sealing ring 6 and the second sealing ring 10 are nitrile sealing rings.
The inner circle part of the metal outer sleeve 3 is processed with taper of 0.9-1.1 degrees, and the axial size is slightly smaller than the length of the large-diameter pipe section 1.1 matched with the inner circle part.
The inner circle part of the metal outer sleeve 3 is in interference fit with the outer circle part of the large-diameter pipe section 1.1.
A manufacturing method of a steel-plastic adapter for heavy-duty fuel gas comprises the following steps:
1) Fitting preparation: blanking the metal lining member 2 and the metal outer sleeve 3 by using a sawing machine, selecting a seamless steel pipe I and a seamless steel pipe II for processing the metal lining member 2 and the metal outer sleeve 3, cutting the seamless steel pipe I and the seamless steel pipe II to a specified length size by using the sawing machine, and preparing for lathe finish machining; placing the blank of the polyethylene plastic pipe fitting 1 at normal temperature for not less than 20 days to ensure that the blank size is fully contracted and eliminate internal stress in the injection molding process;
2) And (3) fitting finish machining: finish machining the first seamless steel pipe and the second seamless steel pipe by a lathe; the method comprises the steps that a lathe is used for turning an outer circle of a seamless steel pipe to obtain a metal lining piece 2, the metal lining piece 2 is an integrally formed pipe body with the same inner diameter, the metal lining piece comprises a pipe body front inserting section 2.1, a pipe body middle limiting section 2.2 and a pipe body tail connecting section 2.3 which are integrally arranged, the outer diameter of the pipe body middle limiting section 2.2 is larger than that of the pipe body front inserting section 2.1, meanwhile, a lathe is used for machining a first annular sealing groove 5, an annular barb structure 4 and a second sealing groove 11 on the metal lining piece 2, the first annular sealing groove 5 is located on the outer wall of the tail section of the pipe body front inserting section 2.1, and the second sealing groove 11 is located on the end face of the pipe body front inserting section 2.1; using a lathe to manufacture a metal outer sleeve 3 for two outer circles and an inner circle of a seamless steel tube, wherein the inner circle part of the metal outer sleeve 3 is processed with a taper of 0.9-1.1 degrees; the inner round end of the polyethylene plastic pipe fitting blank is processed with an inclined chamfer to prepare the polyethylene plastic pipe fitting 1 which is convenient to assemble with the metal lining piece 2; the dimension machining tolerance of the fittings is controlled within +/-0.03 mm in order to ensure the assembly precision; 3) And (3) assembling: nitrile sealing rings are arranged in the first annular sealing groove 5 and the second sealing groove 11; the polyethylene plastic pipe fitting 1 and the metal lining part 2 are respectively placed on a hydraulic thrust machine, after the coaxial and collinear of the two parts are ensured, the two parts are clamped and fixed, the polyethylene plastic pipe fitting 1 and the metal outer sleeve 3 are axially pushed to the position of the limiting section 2.2 in the pipe body by means of hydraulic thrust, so that the tight interference fit and the dimensional accuracy requirements of the outer circle part of the metal lining part 2 and the inner circle part of the polyethylene plastic pipe fitting 1 matched with the metal lining part are ensured, the double effects of connecting the two materials and sealing are achieved, the inner circle sizes of the metal lining part 2 and the polyethylene plastic pipe fitting 1 are basically consistent after the press mounting is finished, and the flow is not influenced by the change of the diameter in the gas conveying process; the inner circle part of the metal outer sleeve 3 and the outer circle part of the polyethylene plastic pipe fitting 1 are pushed and matched by a hydraulic pushing machine to achieve the purpose of tight interference fit;
4) Processing the outer cladding layers of the metal lining piece 2, the metal outer sleeve 3 and the polyethylene plastic pipe fitting 1: the metal lining member 2 and the metal outer sleeve 3 after the electrogalvanizing and corrosion preventing treatment are subjected to surface cleaning treatment, oil stains, moisture and impurities are removed, high-temperature preheating is carried out at 170-190 ℃, then a polyethylene hot melt adhesive tape with the width of 40-50mm and the thickness of 0.5-0.8mm is wound tightly in a seamless mode according to a spiral lap joint mode, and the metal outer sleeve 3 and the metal lining member 2 are covered on the whole surface; and selecting a PEX heat shrinkage sleeve 9 with the tensile strength of more than or equal to 16MPa, the environmental stress cracking resistance time of more than or equal to 1000 hours and the corresponding width, and fully covering the metal part of the part which is pre-coated with the hot melt adhesive winding layer 8.
A special flame gun is adopted, the combustion temperature is controlled to be 270-360 ℃, and the outer surface of the PEX heat shrinkage sleeve 9 is sequentially heated according to the position; in order to ensure that the outer surface of the PEX heat-shrinkable sleeve is carbonized due to overhigh temperature, a mode of short period and repeated flyback heating is adopted, and the local continuous stay heating time is not more than 3s. The fully heated heat shrinkage sleeve is retracted when encountering heat, is tightly held at the outside of the hot melt adhesive, and further melts the polyethylene hot melt adhesive in the interior by the heat transferred by the PEX heat shrinkage sleeve, so that the upper and lower surfaces of the melted hot melt adhesive are respectively and fully welded with the heat shrinkage sleeve and the steel-plastic adapter steel pipe ends.
The inner surface of the polyethylene plastic pipe fitting 1 and the outer surface of the metal lining piece 2 are tightly assembled in a socket-joint manner through a special thrust machine, and the inner surface of the metal outer sleeve 3 and the outer surface of the polyethylene plastic pipe fitting 1 are sealed again, so that the connection strength of the rotating parts is further improved. The processed product is connected into a pipeline system to perform the function of overall bearing.
The annular barb structure 4 forms interference fit with the inner surface of the polyethylene plastic pipe fitting 11 subjected to extrusion deformation, so that the connection and sealing effects are achieved.
The first sealing ring 6 and the second sealing ring 10 are arranged between the polyethylene plastic pipe fitting 1 and the metal lining piece 2 and are extruded and deformed by the two, so that a reliable sealing effect is achieved, and the problem of fluid leakage is avoided.
The surfaces of the metal lining part 2 and the metal outer sleeve 3 are electroplated with zinc by themselves, so that the anti-corrosion effect can be achieved.
The hot melt adhesive winding layer 8 is uniformly wound outside the metal lining part 2 and outside the metal outer sleeve 3, and plays a role in reinforcing corrosion resistance and firmly bonding corrosion resistance layers with different structures.
The PEX heat shrinkage sleeve 9 is wrapped outside the hot melt adhesive winding layer 8 and is compressed outside the hot melt adhesive winding layer 8 through a specific heating process, so that the PEX heat shrinkage sleeve plays a key protection and corrosion prevention role.
When in use, the left end of the polyethylene plastic pipe fitting 1 and the polyethylene pipe are connected to the plastic pipe end in a hot melting or electric melting mode, and the right end of the metal lining piece 2 and the metal pipe are connected in a welding mode.
The polyethylene hot melt adhesive tape is formed by extruding special polyethylene bonding resin, and comprises the following raw materials in percentage by weight: 70% of HDPE, 20-25% of LLDPE, 1-3.5% of maleic anhydride, 0.1% of peroxide crosslinking agent and 0.1% of acetone; wherein the HDPE is high-density polyethylene, the tensile strength is more than or equal to 23Mpa, the elongation at break is more than or equal to 600%, the Vicat softening point is more than or equal to 120 ℃, and the melt flow rate is more than 1g/10 min; LLDPE is linear low-density polyethylene, the breaking tensile strength is more than or equal to 10Mpa, the breaking elongation is more than or equal to 1000%, the Vicat softening point is more than or equal to 95 ℃ and the melt flow rate is more than 20g/10 min.
The peroxide cross-linking agent is dicumyl peroxide.
The embodiments of the present invention are not limited to the above embodiments, and all the similar structures and variations using the present invention are within the scope of the present invention.
Claims (6)
1. The utility model provides a heavy anti-corrosion steel plastic crossover sub for gas, includes polyethylene plastic pipe fitting (1), metal lining piece (2), metal outer tube (3), annular barb structure (4), first annular seal groove (5), first sealing washer (6), electrogalvanizing layer (7), hot melt adhesive winding layer (8), PEX heat shrink sleeve (9), second sealing washer (10) and second seal groove (11), its characterized in that: the polyethylene plastic pipe fitting (1) comprises a large diameter pipe section (1.1) and a small diameter pipe section (1.2) which are integrally arranged, the inner diameter of the large diameter pipe section (1.1) is larger than that of the small diameter pipe section (1.2), the inner diameter of the small diameter pipe section (1.2) is equal to that of the metal lining piece (2), the metal lining piece (2) is an integrally formed pipe body with the same inner diameter, the polyethylene plastic pipe fitting comprises a pipe body front inserting section (2.1), a pipe body middle limiting section (2.2) and a pipe body tail connecting section (2.3) which are integrally arranged, two ends of the pipe body middle limiting section (2.2) are respectively connected with the pipe body front inserting section (2.1) and the pipe body middle limiting section (2.2), the outer diameter of the pipe body middle limiting section (2.2) is larger than that of the pipe body front inserting section (2.1), the front inserting section (2.1) of the pipe body is inserted into the large-diameter pipe section (1.1), the outer wall of the front inserting section (2.1) of the pipe body is in interference fit with the inner wall of the large-diameter pipe section (1.1), the right end face of the large-diameter pipe section (1.1) is propped against the left end face of the limiting section (2.2) in the pipe body, the outer diameter of the large-diameter pipe section (1.1) is larger than the outer diameter of the limiting section (2.2) in the pipe body, a plurality of annular barb structures (4) are arranged on the outer walls of the front section and the middle section of the front inserting section (2.1) of the pipe body at equal intervals, a first annular sealing groove (5) is formed on the outer wall of the tail section of the front inserting section (2.1) of the pipe body, a first sealing ring (6) is arranged in the first annular sealing groove (5), the second sealing ring (10) is arranged between the end face of the small-diameter pipe section (1.2) of the polyethylene plastic pipe fitting (1) and the end face of the pipe body front inserting section (2.1) of the metal lining piece (2), a second sealing groove (11) for placing the second sealing ring (10) is formed in the end face of the pipe body front inserting section (2.1), the small-diameter pipe section (1.2) is sleeved with a metal outer sleeve (3), and the limiting section (2.2) in the pipe body, the pipe body tail connecting section (2.3) and the outer wall of the metal outer sleeve (3) are provided with an electrogalvanizing layer (7); the hot melt adhesive winding layer (8) comprises a hot melt adhesive tape, the winding range of the hot melt adhesive tape is the left end face of the large-diameter pipe section (1.1), the outer wall of the metal outer sleeve (3), the left end face of the large-diameter pipe section (1.1), the outer wall of the limiting section (2.2) in the pipe body and the outer wall of the tail connecting section (2.3), and the PEX heat shrinkage sleeve (9) is sleeved outside the hot melt adhesive winding layer (8); the hot melt adhesive tape is formed by extruding polyethylene bonding resin and comprises 70% of HDPE, 20-25% of LLDPE, 1-3.5% of maleic anhydride, 0.1% of peroxide cross-linking agent and 0.1% of acetone; wherein the HDPE is high-density polyethylene, the tensile strength is more than or equal to 23Mpa, the elongation at break is more than or equal to 600%, the Vicat softening point is more than or equal to 120 ℃ and the melt flow rate is more than 1g/10 min; LLDPE is linear low-density polyethylene, the breaking tensile strength is more than or equal to 10Mpa, the breaking elongation is more than or equal to 1000%, the Vicat softening point is more than or equal to 95 ℃ and the melt flow rate is more than 20g/10 min.
2. The steel-plastic adapter for heavy duty gas as claimed in claim 1, wherein: 3-5 annular barb structures (4) are equidistantly arranged on the outer walls of the front section and the middle section of the front inserting section (2.1) of the pipe body.
3. The steel-plastic adapter for heavy duty gas as claimed in claim 1, wherein: the thickness of the outer wall of the large-diameter pipe section (1.1) is equal to that of the outer wall of the small-diameter pipe section (1.2).
4. The steel-plastic adapter for heavy duty gas as claimed in claim 1, wherein: the front inserting section (2.1) of the pipe body is pressed into the inner hole of the large-diameter pipe section (1.1) by a press machine in an interference fit mode.
5. The steel-plastic adapter for heavy duty gas as claimed in claim 1, wherein: the inner circle part of the metal outer sleeve (3) is processed with taper of 0.9-1.1 degrees, the axial size is slightly smaller than the length of the large-diameter pipe section (1.1) matched with the inner circle part of the metal outer sleeve, and the inner circle part of the metal outer sleeve (3) is in interference fit with the outer circle part of the large-diameter pipe section (1.1).
6. A method of manufacturing a heavy duty gas steel-plastic crossover sub according to claim 5, comprising the steps of:
1) Fitting preparation: blanking the metal lining piece (2) and the metal outer sleeve (3) by using a sawing machine, selecting a seamless steel pipe I and a seamless steel pipe II for processing the metal lining piece (2) and the metal outer sleeve (3), cutting the metal lining piece (2) and the metal outer sleeve to a specified length size by using the sawing machine, and preparing for lathe finish machining; placing the blank of the polyethylene plastic pipe fitting (1) for not less than 20 days at normal temperature to ensure that the blank size is fully contracted and eliminate internal stress in the injection molding process;
2) And (3) fitting finish machining: finish machining the first seamless steel pipe and the second seamless steel pipe by a lathe; the method comprises the steps that a lathe is used for turning an outer circle of a seamless steel pipe to obtain a metal lining piece (2), the metal lining piece (2) is integrally formed and has a pipe body with the same inner diameter, the metal lining piece comprises a pipe body front inserting section (2.1), a pipe body middle limiting section (2.2) and a pipe body tail connecting section (2.3) which are integrally arranged, the outer diameter of the pipe body middle limiting section (2.2) is larger than that of the pipe body front inserting section (2.1), meanwhile, a lathe is used for machining a first annular sealing groove (5), an annular barb structure (4) and a second sealing groove (11) on the metal lining piece (2), the first annular sealing groove (5) is located on the outer wall of the tail section of the pipe body front inserting section (2.1), and the second sealing groove (11) is located on the end face of the pipe body front inserting section (2.1); using a lathe to manufacture a metal outer sleeve (3) for two outer circles and an inner circle of a seamless steel tube, wherein the inner circle part of the metal outer sleeve (3) is processed with a taper of 0.9-1.1 degrees; the inner round end of the polyethylene plastic pipe fitting blank is processed with an inclined chamfer to prepare the polyethylene plastic pipe fitting (1) which is convenient to assemble with the metal lining piece (2); the dimension machining tolerance of the fittings is controlled within +/-0.03 mm in order to ensure the assembly precision;
3) And (3) assembling: nitrile sealing rings are arranged in the first annular sealing groove (5) and the second sealing groove (11); respectively placing a polyethylene plastic pipe fitting (1) and a metal lining piece (2) on a hydraulic thrust machine, ensuring that the two parts are coaxial and collinear, clamping and fixing, and axially pushing the polyethylene plastic pipe fitting (1) and the metal outer sleeve (3) to a limiting section (2.2) in the pipe body by means of hydraulic thrust; the inner circle part of the metal outer sleeve (3) and the outer circle part of the polyethylene plastic pipe fitting (1) are pushed and matched by a hydraulic pushing machine;
4) Processing an outer coating layer of the metal lining piece (2), the metal outer sleeve (3) and the polyethylene plastic pipe fitting (1): the method comprises the steps of (1) carrying out surface cleaning treatment on a metal lining piece (2) and a metal outer sleeve (3) subjected to electrogalvanizing corrosion-resistant treatment, removing greasy dirt, moisture and impurities, preheating at a high temperature of 170-190 ℃, and then carrying out seamless winding and tight winding on a polyethylene hot melt adhesive tape with a width of 40-50mm and a thickness of 0.5-0.8mm in a spiral lap joint mode, so as to cover the whole surfaces of the metal outer sleeve (3) and the metal lining piece (2); and selecting a PEX heat shrinkage sleeve (9) with the tensile strength of more than or equal to 16MPa, the environmental stress cracking resistance time of more than or equal to 1000 hours and the corresponding width, and fully covering the metal part which is pre-coated with the hot melt adhesive winding layer (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711376639.XA CN107956949B (en) | 2017-12-19 | 2017-12-19 | Steel-plastic adapter for heavy-duty gas and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711376639.XA CN107956949B (en) | 2017-12-19 | 2017-12-19 | Steel-plastic adapter for heavy-duty gas and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107956949A CN107956949A (en) | 2018-04-24 |
| CN107956949B true CN107956949B (en) | 2024-03-29 |
Family
ID=61959368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711376639.XA Active CN107956949B (en) | 2017-12-19 | 2017-12-19 | Steel-plastic adapter for heavy-duty gas and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107956949B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108890235B (en) * | 2018-08-22 | 2023-05-05 | 江苏众信绿色管业科技有限公司 | Steel lining stainless steel groove part and manufacturing method thereof |
| CN109357101A (en) * | 2018-12-06 | 2019-02-19 | 上海乔治费歇尔亚大塑料管件制品有限公司 | A kind of heavy caliber 3PE steel modeling conversion pipe fitting and its manufacturing method |
| CN111299977B (en) * | 2020-03-19 | 2022-02-08 | 招商局重工（江苏）有限公司 | Tail shaft sleeve pipe joint lengthening process |
| CN113001999A (en) * | 2021-03-09 | 2021-06-22 | 北京市公用工程设计监理有限公司 | Non-welding connection construction method for PE natural gas pipe |
| CN112984232A (en) * | 2021-04-22 | 2021-06-18 | 河北恒瑞复合材料有限公司 | Pipe assembly and pipe assembly method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201003661Y (en) * | 2006-07-15 | 2008-01-09 | 深圳市沃尔核材股份有限公司 | Copper aluminum pipe connecting equipment for welding |
| CN102635757A (en) * | 2012-03-31 | 2012-08-15 | 余姚市河姆渡庆发实业有限公司 | Reinforced antiseptic polyethylene steel-plastic adapter substitute and processing technology |
| CN105114744A (en) * | 2015-09-13 | 2015-12-02 | 苏州市燃气设备阀门制造有限公司 | Steel-plastic conversion connecting structure |
| CN205504314U (en) * | 2016-03-28 | 2016-08-24 | 徐州工业职业技术学院 | External pressure type steel is moulded changes tube replacement spare |
| CN208058234U (en) * | 2017-12-19 | 2018-11-06 | 山东东宏管业股份有限公司 | Heavy antisepsis combustion gas moulds crossover sub with steel |
-
2017
- 2017-12-19 CN CN201711376639.XA patent/CN107956949B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201003661Y (en) * | 2006-07-15 | 2008-01-09 | 深圳市沃尔核材股份有限公司 | Copper aluminum pipe connecting equipment for welding |
| CN102635757A (en) * | 2012-03-31 | 2012-08-15 | 余姚市河姆渡庆发实业有限公司 | Reinforced antiseptic polyethylene steel-plastic adapter substitute and processing technology |
| CN105114744A (en) * | 2015-09-13 | 2015-12-02 | 苏州市燃气设备阀门制造有限公司 | Steel-plastic conversion connecting structure |
| CN205504314U (en) * | 2016-03-28 | 2016-08-24 | 徐州工业职业技术学院 | External pressure type steel is moulded changes tube replacement spare |
| CN208058234U (en) * | 2017-12-19 | 2018-11-06 | 山东东宏管业股份有限公司 | Heavy antisepsis combustion gas moulds crossover sub with steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107956949A (en) | 2018-04-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107956949B (en) | Steel-plastic adapter for heavy-duty gas and manufacturing method thereof | |
| CN208058234U (en) | Heavy antisepsis combustion gas moulds crossover sub with steel | |
| GB2503880A (en) | Insert for Pipes | |
| CN201891953U (en) | Lining type steel-plastic composite pipe | |
| CN110375140B (en) | Connecting method of steel wire mesh framework polyethylene composite pipe | |
| CN113513648B (en) | Large-caliber steel wire mesh skeleton plastic composite pipe connecting structure and implementation method thereof | |
| CN102635757A (en) | Reinforced antiseptic polyethylene steel-plastic adapter substitute and processing technology | |
| CN107477281A (en) | A kind of double limitation connection systems of ocean fiber reinforced composite pipe | |
| CN113983252A (en) | High-voltage connecting structure for steel wire mesh reinforced composite pipe and manufacturing method thereof | |
| JP5688282B2 (en) | Manufacturing method of piping materials | |
| CN105889651A (en) | Pipeline system capable of resisting leakage, heat and corrosion and construction method of pipeline system | |
| CN113932074B (en) | High-pressure connecting joint of steel wire mesh reinforced composite pipe and manufacturing method thereof | |
| CN210179092U (en) | Welding structure | |
| CN210484855U (en) | Flexible composite pipe | |
| CN211289149U (en) | PE composite electric melting pipe fitting for high-pressure oil and gas pipeline | |
| CN105953006B (en) | Quick coupling and quick coupling and the connection method of non-metal composite pipe | |
| CN209743849U (en) | Connecting pipe fitting for plastic glass pipe | |
| CN110360387B (en) | Outer-sleeved steel inner-plastic-lined anti-corrosion high-pressure-resistant pipe fitting and manufacturing method thereof | |
| CN216078736U (en) | Steel-plastic composite pressure pipeline connecting structure | |
| CN213393943U (en) | Thin joint type enhanced composite pipe | |
| CN110657288A (en) | Metal-plastic composite pipe system and manufacturing method thereof | |
| CN217030253U (en) | Anti-static natural gas conveying anti-corrosion steel pipe | |
| WO2017098327A1 (en) | Improvements relating to polymer lined pipes | |
| CN217440451U (en) | Joint for pipe connection and connection structure of pipe and joint | |
| CN111750194B (en) | Machining die, machining device and machining method for wear-resistant layer of iron tee joint lining |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |