CN102635757B - Reinforced antiseptic polyethylene steel-plastic adapter substitute and processing technology - Google Patents
Reinforced antiseptic polyethylene steel-plastic adapter substitute and processing technology Download PDFInfo
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- CN102635757B CN102635757B CN 201210090942 CN201210090942A CN102635757B CN 102635757 B CN102635757 B CN 102635757B CN 201210090942 CN201210090942 CN 201210090942 CN 201210090942 A CN201210090942 A CN 201210090942A CN 102635757 B CN102635757 B CN 102635757B
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Abstract
The invention discloses a reinforced antiseptic polyethylene steel-plastic adapter substitute and processing technology. The reinforced antiseptic polyethylene steel-plastic adapter substitute is provided with a polyethylene plastic pipe fitting and a metal pipe fitting, wherein the polyethylene plastic pipe fitting and the metal pipe fitting are partially sheathed. The reinforced antiseptic polyethylene steel-plastic adapter substitute is characterized in that 5-8 paths of back-off structures are formed on the outer face of the part of the metal pipe fitting which is sheathed on the polyethylene plastic pipe fitting and 2-3 rings of sealing ring annular slots are arranged at two sides; a wedge-shaped metal sleeve is arranged outside the polyethylene plastic pipe fitting; a DH non-solventepoxy coating layer covers the metal pipe fitting; a hot melt adhesive winding layer and a PEX (crosslinked polyethylene) thermal contraction sleeve cover the adapter substitute; the metal pipe fitting and the polyethylene plastic pipe fitting are in interference fit; and the wedge-shaped metal sleeve and the polyethylene plastic pipe fitting are in interference fit. Due to adoption of the perfect sealing structure design between plastic and steel, the selection of mutually-compatible antiseptic materials and unique processing technology, the service life of the adapter is as long as that of the polyethylene pipe fitting.
Description
Technical field
The present invention relates to a kind of pipeline connection fittings, relate in particular to a kind of pipeline connection fittings for the conveying of fluids such as combustion gas, liquid, be mainly used in jointing and the processing technology of polyethylene (PE) plastic pipe and metallic conduit.
Background technique
In fluid-transporting tubing fields such as combustion gas, pipeline commonly used is generally the plastic pipe of metallic conduit such as steel pipe and polyethylene (PE), and wherein metallic conduit is generally used for the Intermediate High Pressure fluid delivery system, and it is main that plastic pipe then generally is used for low pressure; In addition, for the sake of security, national correlation engineering regulation and stipulation, plastic pipe do not allow directly to enter end-user indoor of pipeline.Therefore at high pressure pipe line to the low pressure pipeline transition, and plastic pipe needs to adopt polyethylene (PE) steel mould crossover sub when registering one's residence from the garden pipe usually.The antiseptic property of polyethylene (PE) pipeline is very outstanding, its design service life was 50 years, and supporting steel is moulded the steel pipe end of crossover sub because what adopt is steel material with it, the antiseptic property of itself does not catch up with the requirement of polyethylene (PE) pipe far away, add that steel moulds the crossover sub majority and be embedded in moist underground, or be exposed in the air, therefore require very high to its corrosion-resistant.
Common steel is moulded conversion mostly just at anti-corrosion materials such as external spray one deck nylon of steel pipe end or epoxy resin, in accumulating, installation, and in the later stage using process, factor such as collided with easily, the problem that anticorrosive coat comes off occurs, antiseptic effect and working life are all undesirable.And also strengthen anti-corrosion measure in other multilayers that adopt on the engineering at present, also often exist the complex procedures, construction requirement height, anti-corrosion material can't be simultaneously and defective such as reliable bonding simultaneously between steel pipe and polyethylene (PE) pipe, there are various problems, are being difficult to reach perfect unification aspect antiseptic effect and the Economy.
Summary of the invention
Main purpose of the present invention is to solve the existing in prior technology deficiency, thus by mould, the selection of perfect design of Sealing Structure and compatible anti-corrosion material between the steel, reach the polyethylene steel-plastic crossover sub of perfect antiseptic effect.
For cooperating above-mentioned purpose, the complete anticorrosion polyethylene steel-plastic crossover sub of the reinforcement processing technology of one cover that the present invention has studied success, guarantee polyethylene (PE) no matter steel is moulded the crossover sub direct-burried underground, still be exposed in the air, all can perfectly realize and polyethylene (PE) the pipeline purpose in identical working life.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
The anticorrosion polyethylene steel-plastic crossover sub of a kind of reinforcement,
Have polyvinyl plastics pipe fitting and metal pipe element, described polyvinyl plastics pipe fitting and the socket of metal pipe element part is characterized in that: described polyvinyl plastics pipe fitting is socketed in the metal pipe element outside; The metal pipe element outside of described polyvinyl plastics pipe fitting and metal pipe element socket place is processed with 5-8 road back-off structure, and both sides are processed with 2 to 3 circle seal ring circular grooves, in the described circular groove O-ring seals are installed; There is the wedge metal sleeve polyvinyl plastics pipe fitting outside of described polyvinyl plastics pipe fitting and metal pipe element socket place; Metal pipe element outside after connection coats DH solventless epoxy coating layer, is coated with the hot melt adhesive winding layer in described epoxy paint layer, wedge metal sleeve and part polyethylene plastic tube outside, is coated with the PEX thermal contraction casing tube in described hot melt adhesive winding layer outside; Form interference fit between described metal pipe element and polyvinyl plastics pipe fitting and wedge metal sleeve and the polyvinyl plastics pipe fitting; The tapering of described wedge metal sleeve is 2 ± 0.2 °.
A kind of processing technology of strengthening anticorrosion polyethylene steel-plastic crossover sub,
It is that the polyvinyl plastics pipe fitting partly is socketed in the metal pipe element outside that the anticorrosion steel of described reinforcement is moulded crossover sub, there are 5-8 road back-off structure and 2 to 3 circle seal ring circular grooves in the metal pipe element outside of socket place, there is the wedge metal sleeve plastic pipe outside of socket place, and the three forms interference fit;
1), selects materials
According to product specification, select the seamless steel pipe for processing metal pipe fitting and wedge metal sleeve for use;
Adopt special use to add thick polyethylene (PE) injection moulding accessory, the corner of described injection moulding accessory is through chamfered; Described adding thickness is the 1.2-1.4 of conventional design thickness;
2), gold machining:
The outside of metal pipe element is processed with 5-8 road back-off structure and 2 to 3 and encloses the circular groove that is used for installing O-ring seals; Described back-off structure and circular groove are positioned at the position of polyvinyl plastics pipe fitting and metal pipe element socket place; Described circular groove is positioned at both sides or both sides and the neutral position of socket place;
The wedge metal sleeve adopts high-precision lathe in machining, and internal diameter size tolerance control is in ± 0.03mm;
3), plastic pipe is accurately processed:
Plastic pipe by operation card requirement injection moulding blank after, need to place more than 1 month, inner because the internal stress that production process produces to eliminate pipe fitting;
Accurately before the processing, earlier the moulding blank is moved in 20 ℃ of isoperibols through the status adjustment more than 24 hours;
Adopt the supporting inner and outer surface of high precision numerical control lathe pair and metal pipe element and wedge metal sleeve accurately to process, the precision of interior external diameter is controlled in ± 0.06mm;
4), assembling:
Put seam ring and O-ring seals in the metal pipe element outside;
The polyvinyl plastics pipe fitting is placed in metal pipe element outside, till seam ring place, make metal pipe element and the polythene material that cooperates with it between form tight interference fit; Both reach the effect that connects two kinds of materials, born the part seal action simultaneously.
Highi degree of accuracy wedge metal sleeve is placed in vinyl tube spare outside, till seam ring place, the polyvinyl plastics pipe fitting is inwardly pushed, both form reliable connection;
5), metal pipe element, wedge metal sleeve and the clad processing of polyvinyl plastics pipe fitting outside:
The metal pipe element skin sprays one deck DH solventless epoxy coating in advance, and this coating is two components, is applied after stirring in proportion by A, B component, has the characteristics of quick-drying, thick film;
The DH solventless epoxy coating carries out evenly polishing fully to the epoxy coating surface on the self-control polisher that adopts lathe to reequip after drying, makes the coating layer surface more coarse, significantly improves the Adhesion force with other anti-corrosion materials;
The metal pipe element that scribbles the DH solventless epoxy coating is carried out 190 ℃-210 ℃ high temperature preheating, fully eliminate the moisture of epoxy paint layer;
To DH solventless epoxy coating layer through abundant heat drying and metal pipe element behind high temperature preheating, adopt wide about 50mm, the low molecular weight polyethylene Hot melt adhesive tape of thick 0.5-1mm, spiral amount of lap according to 50% is twined covering, and coverage rate relates to the part of metal pipe element, wedge metal sleeve and polyethylene pipe end;
According to the total length suit PEX thermal contraction casing tube of product, described thermal contraction casing tube covers all Hot melt adhesive tape winding zone;
Adopt special-purpose flame gun, between combustion temperature was controlled 300-500 ℃, opsition dependent carried out heat treated to thermal contraction casing tube successively; Coking needs to adopt the short period for fear of PEX heat-shrinkable T bush outer surface Yin Wendu is too high, sweeps the mode of heating repeatedly back and forth, and the local time that stops heating continuously should not surpass 3s, and entire product is controlled in 15min overall heating time approximately.Fully the thermal contraction casing tube after the heating can fully bounce back, closely hold the outside in hot melt adhesive tightly, and further melt inner polyethylene (PE) Hot melt adhesive tape by the heat that thermal contraction casing tube passes over, make the Hot melt adhesive tape upper and lower surface of fusion mould crossover sub steel pipe end with thermal contraction casing tube and steel respectively and polyethylene (PE) pipe end is bonding, thereby be welded together;
Each layer anticorrosive coat is through the flame gun heating, after tentatively merging between each layer, adopt the principle of electromagnetic induction heating again, steel pipe is carried out double heating to be handled, set technology according to different product specifications, the heating and temperature control of electromagnetism heating collar is at 160 ± 10 ℃, and whole control heating time is in 5min; Because electromagnetic induction heating is only effective to metal, therefore, the heating heat of this moment is the outwards evenly diffusion of steel pipe by inside, just can form perfect complementary effect with flame gun external heat before, heat transmits from outside to inside and spreads from inside to outside and combines, it is more even that the hot melt of each interlayer is distributed, bonding more reliable between each layer anticorrosive coat.
Beneficial effect of the present invention is: by mould, perfect design of Sealing Structure between the steel, the selection of compatible anti-corrosion material and unique treatment process, no matter thereby guarantee that the present invention's direct-burried is underground, still be exposed in the air, the antiseptic effect more excellent far beyond other like products, the perfect realization working life identical with polyethylene (PE) pipeline.
Description of drawings
Accompanying drawing 1 is a kind of structural representation of the present invention.
Description of reference numerals: 1, polyvinyl plastics pipe fitting, 2, the wedge metal sleeve, 3, metal pipe element, 4, back-off structure, 5, the seal ring circular groove, 6, the O RunddichtringO, 7, DH solventless epoxy coating layer, 8, the hot melt adhesive winding layer, 9, the PEX thermal contraction casing tube.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technological scheme of the present invention is described in further detail.
Embodiment 1:
Polyethylene steel-plastic crossover sub as shown in Figure 1 has polyvinyl plastics pipe fitting 1 and metal pipe element 3, described polyvinyl plastics pipe fitting and the socket of metal pipe element part, and described polyvinyl plastics pipe fitting is socketed in the metal pipe element outside; The metal pipe element outside of described polyvinyl plastics pipe fitting and metal pipe element socket place is processed with 6 road back-off structure 4, and both sides are processed with 2 circle seal ring circular grooves 5, and O-ring seals 6 is installed in the described circular groove; There is wedge metal sleeve 2 the polyvinyl plastics pipe fitting outside of described polyvinyl plastics pipe fitting 1 and metal pipe element 3 socket places; Metal pipe element outside after connection coats DH solventless epoxy coating layer 7, be coated with hot melt adhesive winding layer 8 in described epoxy paint layer, wedge metal sleeve and part polyethylene plastic tube outside, be coated with PEX thermal contraction casing tube 9 in described hot melt adhesive winding layer outside; Form interference fit between described metal pipe element and polyvinyl plastics pipe fitting and wedge metal sleeve and the polyvinyl plastics pipe fitting; The tapering of described wedge metal sleeve is 2 ± 0.2 °.
Processing technology:
1), selects materials
According to product specification, select the seamless steel pipe for processing metal pipe fitting and wedge metal sleeve for use;
Adopt special use to add thick polyethylene (PE) injection moulding accessory, the corner of described injection moulding accessory is through chamfered; Described adding thickness is 1.2 of conventional design thickness;
2), gold machining:
The outside of metal pipe element is processed with 6 road back-off structure and 2 and encloses the circular groove that is used for installing O-ring seals; Described back-off structure and circular groove are positioned at the position of polyvinyl plastics pipe fitting and metal pipe element socket place; Described circular groove is positioned at both sides or both sides and the neutral position of socket place;
The wedge metal sleeve adopts high-precision lathe in machining, and internal diameter size tolerance control is in ± 0.03mm;
3), plastic pipe is accurately processed:
Plastic pipe by operation card requirement injection moulding blank after, need to place more than 1 month, inner because the internal stress that production process produces to eliminate pipe fitting;
Accurately before the processing, earlier the moulding blank is moved in 20 ℃ of isoperibols through 24 hours status adjustment;
Adopt the supporting inner and outer surface of high precision numerical control lathe pair and metal pipe element and wedge metal sleeve accurately to process, the precision of interior external diameter is controlled in ± 0.06mm;
4), assembling
Put seam ring and O-ring seals in the metal pipe element outside;
The polyvinyl plastics pipe fitting is placed in metal pipe element outside, till seam ring place, make metal pipe element and the polythene material that cooperates with it between form tight interference fit; Both reach the effect that connects two kinds of materials, born the part seal action simultaneously.
Highi degree of accuracy wedge metal sleeve is placed in vinyl tube spare outside, till seam ring place, the polyvinyl plastics pipe fitting is inwardly pushed, both form reliable connection;
5), metal pipe element, wedge metal sleeve and the clad processing of polyvinyl plastics pipe fitting outside
The metal pipe element skin sprays one deck DH solventless epoxy coating in advance, and this coating is two components, applies after being stirred in the ratio of 1:1 by A, B component, has the characteristics of quick-drying, thick film;
The DH solventless epoxy coating carries out evenly polishing fully to the epoxy coating surface after drying on the self-control polisher that adopts the lathe repacking, make the coating layer surface more coarse, significantly improves the Adhesion force with other anti-corrosion materials;
The metal pipe element that scribbles the DH solventless epoxy coating is carried out 200 ℃ high temperature preheating, fully eliminate the moisture of epoxy paint layer;
To DH solventless epoxy coating layer through abundant heat drying and metal pipe element behind high temperature preheating, adopt wide 50mm, the low molecular weight polyethylene Hot melt adhesive tape of thick 0.5mm, spiral amount of lap according to 50% is twined covering, and coverage rate relates to the part of metal pipe element, wedge metal sleeve and polyethylene pipe end;
According to the total length suit PEX thermal contraction casing tube of product, described thermal contraction casing tube covers all Hot melt adhesive tape winding zone.
Adopt special-purpose flame gun, between 400 ℃ of the flame gun combustion temperature controls, opsition dependent carries out heat treated to thermal contraction casing tube successively, adopt the short period, sweep the mode of heating repeatedly back and forth, the local time that stops heating continuously should not surpass 3s, entire product is controlled in 15min overall heating time approximately, fully the thermal contraction casing tube after the heating can fully bounce back, closely hold the outside in hot melt adhesive tightly, and further melt inner polyethylene (PE) Hot melt adhesive tape by the heat that thermal contraction casing tube passes over, make the Hot melt adhesive tape upper and lower surface of fusion mould crossover sub steel pipe end with thermal contraction casing tube and steel respectively and polyethylene (PE) pipe end is bonding, thereby be welded together.
Adopt the principle of electromagnetic induction heating again, steel pipe is carried out double heating handle, the heating and temperature control of electromagnetism heating collar is at 160 ± 10 ℃, and whole control heating time is in 5min.Because electromagnetic induction heating is only effective to metal, therefore, the heating heat of this moment is the outwards evenly diffusion of steel pipe by inside, just can form perfect complementary effect with flame gun external heat before, heat transmits from outside to inside and spreads from inside to outside and combines, it is more even that the hot melt of each interlayer is distributed, bonding more reliable between each layer anticorrosive coat.
Above-mentioned processing, polyvinyl plastics pipe fitting 1 closely connect after pushing by wedge metal sleeve pipe 2 with metal pipe element 3, form a sealed whole, mainly bear the function of overall product pressure-bearing.
2 pairs of polyvinyl plastics pipe fittings of wedge metal sleeve 1 form extruding closely, guarantee that polyvinyl plastics pipe fitting and metal pipe element form reliable and firm being connected.
Back-off structure 4 forms interference fit with the internal surface of the polyvinyl plastics pipe fitting 1 of the deformation that is squeezed, and reaches the effect that connects and seal.
O RunddichtringO 6 is subjected to both compressional deformations between polyvinyl plastics pipe fitting and metal pipe element, play reliable seal action, thereby stops the generation of fluid leakage problem.
DH solventless epoxy coating layer 7 is coated in treated metal pipe element 3 outer surfaces uniformly by the mode of spraying, plays last one corrosion-resistant effect.
Low molecular weight polyethylene (PE) hot melt adhesive winding layer 8 uniform winding are in the outside of DH solventless epoxy coating layer 7, wedge metal sleeve pipe 2 and polyvinyl plastics pipe fitting, and namely play and strengthen the corrosion-resistant effect, but different anticorrosive coats of secure bond again.
PEX thermal contraction casing tube 9 is sleeved on the outside that has covered low molecular weight polyethylene (PE) hot melt adhesive winding layer 8, and through the special process operation, tightens in hot melt adhesive winding layer 8 outsides, plays first road, also is most important one antisepsis.
In use, left end and the polyethylene pipe of polyvinyl plastics pipe fitting 1 are connected to the plastic pipe end by modes such as hot melts, and an end of metal pipe element 3 can be connected with the mode of metallic conduit by screw thread or welding.
Embodiment 2:
Adopt special use to add thick polyethylene (PE) injection moulding accessory, described adding thickness is 1.4 of conventional design thickness;
The outside of metal pipe element is processed with 8 road back-off structure and 3 and encloses the circular groove that is used for installing O-ring seals.
Adopt wide 50mm, the low molecular weight polyethylene Hot melt adhesive tape of thick 1.0mm twines covering according to 50% spiral amount of lap.
All the other are with embodiment 1.
In sum, the present invention adopts two pass O type circle sealing configuration, forms mechanical connection by the wedge metal sleeve between plastic and metalwork, reach reliable sealing effect, adopt three layers of compatible anti-corrosion material simultaneously, and adopt particular processing technology, thereby reach perfect antiseptic effect.
Claims (4)
1. strengthen anticorrosion polyethylene steel-plastic crossover sub for one kind, have polyvinyl plastics pipe fitting and metal pipe element, described polyvinyl plastics pipe fitting and the socket of metal pipe element part is characterized in that:
Described polyvinyl plastics pipe fitting is socketed in the metal pipe element outside; The metal pipe element outside of described polyvinyl plastics pipe fitting and metal pipe element socket part is processed with 5-8 road back-off structure, and both sides are processed with 2 to 3 circle seal ring circular grooves, in the described circular groove O-ring seals are installed; There is the wedge metal sleeve polyvinyl plastics pipe fitting outside of described polyvinyl plastics pipe fitting and metal pipe element socket part; Metal pipe element outside after the three connects coats DH solventless epoxy coating layer, be coated with the hot melt adhesive winding layer in described epoxy paint layer, wedge metal sleeve and part polyethylene plastic tube outside, be coated with the PEX thermal contraction casing tube in described hot melt adhesive winding layer outside.
2. the anticorrosion polyethylene steel-plastic crossover sub of reinforcement according to claim 1 is characterized in that:
Form interference fit between described metal pipe element and polyvinyl plastics pipe fitting and wedge metal sleeve and the polyvinyl plastics pipe fitting.
3. the anticorrosion polyethylene steel-plastic crossover sub of reinforcement according to claim 1 is characterized in that:
The tapering of described wedge metal sleeve is 2 ± 0.2 °.
4. the processing technology of the anticorrosion polyethylene steel-plastic crossover sub of reinforcement as claimed in claim 1 is characterized in that:
1), select materials:
According to product specification, select the seamless steel pipe for processing metal pipe fitting and wedge metal sleeve for use;
Employing adds thick polyethylene (PE) injection moulding accessory, and the corner of described injection moulding accessory is through chamfered; The injection moulding accessory is the 1.2-1.4 of conventional design thickness;
2), machining:
The outside of metal pipe element is processed with 5-8 road back-off structure and 2 to 3 and encloses the circular groove that is used for installing O-ring seals; Described back-off structure and circular groove are positioned at the position of polyvinyl plastics pipe fitting and metal pipe element socket place; Described circular groove is positioned at both sides or both sides and the neutral position of socket place;
The wedge metal sleeve adopts high-precision lathe in machining, and internal diameter size tolerance control is in ± 0.03mm;
3), plastic pipe is accurately processed:
Behind the plastic pipe injection moulding blank, need to place more than 1 month, inner because the internal stress that production process produces to eliminate pipe fitting;
Accurately before the processing, earlier the moulding blank is moved in 20 ℃ of isoperibols through the status adjustment more than 24 hours;
Adopt the supporting inner and outer surface of high precision numerical control lathe pair and metal pipe element and wedge metal sleeve accurately to process, the precision of interior external diameter is controlled in ± 0.06mm;
4), assembling:
Put seam ring and O-ring seals in the metal pipe element outside;
The polyvinyl plastics pipe fitting is placed in metal pipe element outside, till seam ring place, make metal pipe element and the polythene material that cooperates with it between form tight interference fit;
The wedge metal sleeve is placed in vinyl tube spare outside, till seam ring place, the polyvinyl plastics pipe fitting is inwardly pushed, both form reliable connection;
5), metal pipe element, wedge metal sleeve and the clad processing of polyvinyl plastics pipe fitting outside:
Evenly apply a layer thickness at the DH of 0.5 ± 0.1mm solventless epoxy coating in the metal pipe element outside;
The DH solventless epoxy coating carries out evenly fully polishing after drying, makes the coating layer surface more coarse;
The steel pipe body that scribbles epoxy paint layer is carried out 190 ℃-210 ℃ high temperature preheating, fully eliminate the moisture of epoxy paint layer;
Adopt wide 50mm, the low molecular weight polyethylene Hot melt adhesive tape of thick 0.5-1mm twines covering according to 50% spiral amount of lap, and coverage rate relates to the part of the whole and polyethylene pipe end of metal pipe element and wedge metal sleeve;
Suit isometric PEX thermal contraction casing tube roughly on the Hot melt adhesive tape winding zone;
Adopt special-purpose flame gun, between combustion temperature was controlled 300-500 ℃, opsition dependent carried out heat treated to the PEX thermal contraction casing tube successively, and entire product control heating time is in 15min;
Adopt the high temperature electromagnetic heating apparatus that metal pipe element and wedge metal sleeve are carried out the heat treated second time, the temperature control of electromagnetism heating is at 160 ± 10 ℃, and entire product control heating time is in 5min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201210090942 CN102635757B (en) | 2012-03-31 | 2012-03-31 | Reinforced antiseptic polyethylene steel-plastic adapter substitute and processing technology |
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| CN 201210090942 CN102635757B (en) | 2012-03-31 | 2012-03-31 | Reinforced antiseptic polyethylene steel-plastic adapter substitute and processing technology |
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| CN102635757A CN102635757A (en) | 2012-08-15 |
| CN102635757B true CN102635757B (en) | 2013-10-02 |
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| CN104653821A (en) * | 2015-01-26 | 2015-05-27 | 浙江庆发管业科技有限公司 | High-corrosion prevention steel-plastic ball valve for fuel gas and manufacturing method of high-corrosion prevention steel-plastic ball valve |
| EP3115671B1 (en) * | 2015-07-07 | 2019-11-13 | Georg Fischer JRG AG | Transition fitting |
| CN107448695A (en) * | 2017-09-12 | 2017-12-08 | 丹阳市丹达防腐设备有限公司 | A kind of polyfluortetraethylecomposite composite pipe |
| CN107956949B (en) * | 2017-12-19 | 2024-03-29 | 山东东宏管业股份有限公司 | Steel-plastic adapter for heavy-duty gas and manufacturing method thereof |
| CN108747266B (en) * | 2018-06-28 | 2024-01-23 | 南京晨光集团有限责任公司 | Surface protection device and method for shaft parts with complex shapes |
| CN109373088A (en) * | 2018-11-05 | 2019-02-22 | 浙江庆发管业科技有限公司 | A kind of flexibility anti-settling self-regulation steel modeling conversion |
| 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 large-diameter 3PE steel-plastic conversion pipe fitting and its manufacturing method |
| CN113400664A (en) * | 2021-06-29 | 2021-09-17 | 临海伟星新型建材有限公司 | 3PE (polyethylene) anticorrosion processing technology and device for steel-plastic conversion pipe fitting |
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| SU1710917A1 (en) * | 1989-03-28 | 1992-02-07 | Ленинградский механический институт им.Маршала Советского Союза Д.Ф.Устинова | Pipeline junction |
| CN2384093Y (en) * | 1999-06-30 | 2000-06-21 | 浙江铭仕机械有限公司 | Jointing part for pipe joint |
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| CN201462327U (en) * | 2009-07-03 | 2010-05-12 | 中国石油天然气集团公司 | Steel elbow pipe with two-layer structure of solvent-free epoxy coating and polyethylene adhesive tape |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1710917A1 (en) * | 1989-03-28 | 1992-02-07 | Ленинградский механический институт им.Маршала Советского Союза Д.Ф.Устинова | Pipeline junction |
| CN2384093Y (en) * | 1999-06-30 | 2000-06-21 | 浙江铭仕机械有限公司 | Jointing part for pipe joint |
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| CN102635757A (en) | 2012-08-15 |
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Owner name: ZHEJIANG QINGFA PIPE TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: YUYAO HEMUDU QINGFA INDUSTRY CO., LTD. Effective date: 20140207 |
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Effective date of registration: 20140207 Address after: 315415, Ningbo Town, Zhejiang City, Yuyao Province town of Jing Jing Pu Industrial Zone Patentee after: Zhejiang Qingfa Pipe Technology Co., Ltd. Address before: 315415, Ningbo Town, Zhejiang City, Yuyao Province town of Jing Jing Pu Industrial Zone Patentee before: Yuyao Hemudu Qingfa Industry Co., Ltd. |
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