CN108180325A - A kind of production method of band injection electric heating melting bell and spigot joint internal-rib bellows and its connector - Google Patents
A kind of production method of band injection electric heating melting bell and spigot joint internal-rib bellows and its connector Download PDFInfo
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- CN108180325A CN108180325A CN201711313034.6A CN201711313034A CN108180325A CN 108180325 A CN108180325 A CN 108180325A CN 201711313034 A CN201711313034 A CN 201711313034A CN 108180325 A CN108180325 A CN 108180325A
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- electric heating
- heating melting
- tubing
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- annular
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- 238000005485 electric heating Methods 0.000 title claims abstract description 36
- 238000002844 melting Methods 0.000 title claims abstract description 35
- 230000008018 melting Effects 0.000 title claims abstract description 35
- 238000002347 injection Methods 0.000 title claims abstract description 20
- 239000007924 injection Substances 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000003801 milling Methods 0.000 claims abstract description 27
- 239000011324 bead Substances 0.000 claims abstract description 17
- 238000004804 winding Methods 0.000 claims abstract description 9
- 238000001746 injection moulding Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000002708 enhancing effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- -1 Polyethylene structure Polymers 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 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
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
- B29C45/14221—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure by tools, e.g. cutting means
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14598—Coating tubular articles
-
- 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
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/14—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics
- F16L11/15—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics corrugated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/02—Welded joints; Adhesive joints
- F16L47/03—Welded joints with an electrical resistance incorporated in the joint
-
- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
- B29C2045/14237—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being deformed or preformed outside the mould or mould cavity
- B29C2045/14245—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being deformed or preformed outside the mould or mould cavity using deforming or preforming means outside the mould cavity
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses the production methods of a kind of band injection electric heating melting bell and spigot joint internal-rib bellows and its connector, this structure includes the tubing that spiral winding forms, bellmouth and socket, tubing both ends are respectively arranged with port, it is characterized in that, the port of the tubing is annular surface, tubing both ends form annular surface by milling, there is annular bead on annular surface, annular surface is faying surface, bellmouth and socket are overlapped on the both ends port of tubing respectively at faying surface, and bellmouth inner wall is provided with electric heating melting net, and electric heating melting Netcom is molded the embedded bellmouth inner wall online excessively.The production method of its connector is using by the way of pipe end injection, solving the problems, such as quick to install electric heating melting net online, while need to solve the problems, such as being reliably connected for pipe shaft and injection molding joint.Simple production process, properties of product are reliable.
Description
Technical field
The invention belongs to internal-rib bellows tubing and its processing technique field more particularly to a kind of band injection electric heating melting socket joints
The production method of connector internal-rib bellows and its connector.
Background technology
Polyethylene structure wall winding tube has many advantages, such as that rotproofness, frictional resistance are low, wear-resistant, firm with very high ring
Degree, buried depth, and also integral forming technique is good, stitches tensile strength and anti-corrosive properties are high, longer life expectancy；With a variety of reliable, convenience
Connection mode.This tubing has become the bright spot of investment of current plastic draining blowdown tubing at present.At present, polyethylene structure
Wall winding tube has A types pipe, Type B pipe and internal-rib enhancing helical bellows.In the connection of this kind of multiple tube, coupling pipe elements and its with pipe
The connection structure of material is most important.Current internal-rib enhancing helical bellows (hereinafter referred to as internal-rib bellows) manufacture method is such as
Under：It will be docked by the prefabricated component that solid wall pipe vehicle makes with molding fixed length cutting tubing plane or spiral dock and forms bell and spigot, so
Set processing is shunk, while heating net is fixed by manual operation and use riveting gun by artificial interior external welding or outer cladding again afterwards
Or mild heat rolling is fixed on receptacle wall, multi-process handling and complicated, and the production cycle is long, and there are the links of quality problems
It is more, for example, ripple type structure cause docking when all directions unbalance stress and its be susceptible to wall thickness it is thin place rosin joint or
It is askew to there is connector weldering.For internally finned tube due to its special structure design, ripple valley overlapping area is very small, in addition its ripple
Irregularly, trouble is brought a great deal of trouble to injection, pipe shaft is connect with connector often to go wrong.In current extruding-out process production
Rib enhancing helical bellows production cost is high, meanwhile, because interface uses board-like welding, welding equipment is heavy, and construction is inconvenient.
Invention content
In view of the problems of the above-mentioned prior art, the purpose of the present invention is disclose a kind of simple production process, product
The internal-rib bellows of the electric heating melting bell and spigot joint of dependable performance solves the problems, such as quick online installation electric heating melting net, solves simultaneously
It has determined internal-rib bellows pipe shaft and the problem of being reliably connected of injection molding joint.
Another object of the present invention also resides in the production method for providing a kind of internal-rib bellows of electric heating melting bell and spigot joint.
The purpose of the present invention will be achieved by the following technical programs：
A kind of band is molded electric heating melting bell and spigot joint internal-rib bellows, including the tubing that spiral winding forms, bellmouth and socket,
Tubing both ends are respectively arranged with port, which is characterized in that the port of the tubing is annular surface, and the tubing both ends pass through milling
Annular surface is formed, there is annular bead on annular surface, the annular surface is faying surface, and the bellmouth and socket are taken respectively at faying surface
The both ends port of tubing is connected on, the bellmouth inner wall is provided with electric heating melting net, and the electric heating melting Netcom is molded embedded institute online excessively
State bellmouth inner wall.
Further, axially there is 1~5 ° of taper in the face where the electric heating melting net with socket electric heating melting face with tubing.
Further, the annular surface width is more than or equal to 20mm.
Further, the annular bead by milling attachment to the ripple milling shape at the tubing both ends of internal-rib bellows
Into the remaining annular bead thickness is more than or equal to 3mm after milling, and the annular bead is spiral winding, annular surface and note
It moulds the bellmouth formed and the interface forms close fastening in lap-joint.
A kind of production method of band injection electric heating melting bell and spigot joint internal-rib bellows internal-rib bellows injection moulding connector, step
It is as follows：
A. by internal-rib bellows fixed length cutting, ensure both ends of the surface truncation；
B. ripple is milled away, remainder forms annular surface, and annular surface is wider than equal to 20mm, the annular on annular surface
Flange collar thickness is more than or equal to 3mm；
C. tubing is put into injection machine mould and be molded, placement heater wire is needed to embed bellmouth；
D. overlap is handled, connector finishing.
The annular bead Thickness ness is between 3-10mm, and annular surface width is between 20-40mm.
The configuration of the present invention is simple, simple process.It is directly molded bellmouth and interface respectively in two-port, is molded bellmouth and interface
With the annular surface at pipe end formed it is chimeric link closely, solve internal-rib bellows pipe shaft and injection molding joint be reliably connected ask
Topic, substantially increases the reliability that bellmouth and interface are connect with tubing.Bell and spigot joint is solved using by the way of pipe end injection
Quick online installation electric heating melting net problem.
This method is simple for process, and energy-output ratio is small, and production equipment has online integrated molding, efficient, production production
Product dependable performance has the advantages of ring stiffness is good, and internal pressure resistance is strong.Meanwhile labor intensity and cost of labor are this approach reduced,
Stable working.
Description of the drawings
Fig. 1 is the structure diagram of spigot-and-socket internal-rib bellows of the embodiment of the present invention.
Fig. 2 is the milling process schematic diagram of tubing straight tube in production method of the embodiment of the present invention.
Fig. 3 is the injection moulding process schematic diagram of production method center tap bellmouth of the embodiment of the present invention
Fig. 4 is the structure enlargement diagram at A in Fig. 1 of the embodiment of the present invention.
Fig. 5 is the structure enlargement diagram at B in Fig. 1 of the embodiment of the present invention.
1 bellmouth, 2 sockets, 3 tubing, 4 electric heating melting nets, 5 melten gels, 6 milling faces one, 7 milling faces two, 8 port faying surfaces, 9 millings
Bevel three；11 tubing straight tubes；12nd, ripple milling attachment；121st, fixed seat；122 milling cutter devices；123 internal support devices；124th, tubing
Supporting rotary frame；Tubing after 21 millings；22nd, core model guide sleeve；23rd, core model；24 external mold blocking material rings；25th, external mold.
Specific embodiment
Just attached drawing in conjunction with the embodiments below, the embodiment of the present invention is described in further detail, so that of the invention
Technical solution is more readily understood, grasps.
Embodiment
A kind of internal-rib bellows of band injection electric heating melting bell and spigot joint, including the tubing 3 that spiral winding forms, 1 He of bellmouth
Socket 2,3 both ends of tubing are respectively arranged with port, which is characterized in that the original ripple in end of tubing 3 is by milling at 3 end of tubing
Capitiform has annular bead, annular bead is spiral winding into only 20mm wide and above annular surface on annular surface.Convex annular
Circle is formed the ripple milling at the tubing both ends of internal-rib bellows by milling attachment, and wind bellows by milling forms for one week
Milling face 1, milling face 27 and milling face 39, bellmouth 1 and socket 2 are overlapped on the both ends port of tubing 3,1 He of bellmouth respectively
Socket 2 is connected together by bell and spigot 2 by the annular surface that milling is formed and 3 end of tubing.Annular surface width be more than etc.
Remaining annular bead thickness is more than or equal to 3mm after 20mm, milling, with the bellmouth 1 and interface that are molded in lap-joint's shape
It is fitted into close.
1 inner wall of bellmouth is provided with electric heating melting net 4, and the electric heating melting net 4 by being molded embedded 1 inner wall of bellmouth online.
Axially there is 1~5 ° of taper in face where electric heating melting net 4 with 2 electric heating melting face of socket with tubing 3.
Annular surface width is between 20-40mm.It is preferred that 20mm or 30mm.
Annular bead thickness is between 3-10mm.It is preferred that 5mm or 3mm.
Production method with injection electric heating melting bell and spigot joint internal-rib bellows internal-rib bellows injection moulding connector, step is such as
Under：
A. by internal-rib bellows fixed length cutting, ensure both ends of the surface truncation；
B. ripple is milled away using special ripple milling attachment, remainder forms annular surface, the annular that milling is formed
Flange collar residual altitude is more than or equal to 3mm, and circumferential face is wider than equal to 20mm；Annular bead thickness is between 3-10mm, preferably
20mm or 30mm.Circumferential face width is between 20-40mm, annular bead thickness preferred 5mm or 3mm.
C. tubing is put into injection machine mould and be molded, placement heater wire is needed to embed bellmouth；
D. overlap is handled, connector finishing.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (8)
1. a kind of band is molded electric heating melting bell and spigot joint internal-rib bellows, including the tubing that spiral winding forms, bellmouth and socket, and pipe
Material both ends are respectively arranged with port, which is characterized in that the port of the tubing is annular surface, and tubing both ends form ring by milling
There is annular bead in shape face on annular surface, and annular surface is the both ends that faying surface, bellmouth and socket are overlapped on tubing respectively at faying surface
Port, bellmouth inner wall are provided with electric heating melting net, and electric heating melting Netcom is molded the embedded bellmouth inner wall online excessively.
2. the internal-rib bellows of band injection electric heating melting bell and spigot joint according to claim 1, which is characterized in that the electric heating
Axially there is 1~5 ° of taper in face where molten net with socket electric heating melting face with tubing.
3. the internal-rib bellows of band injection electric heating melting bell and spigot joint according to claim 1, which is characterized in that the annular
Face width is more than or equal to 20mm.
4. the internal-rib bellows of band injection electric heating melting bell and spigot joint according to claim 1, which is characterized in that the annular
Flange collar is formed the ripple milling at the tubing both ends of internal-rib bellows by milling attachment, and the remaining annular bead is thick after milling
Degree is more than or equal to 3mm, and the annular bead is spiral winding, and annular surface exists with the bellmouth being molded and the interface
Lap-joint forms close fastening.
5. the internal-rib bellows of band injection electric heating melting bell and spigot joint according to claim 3, which is characterized in that the annular
Face width is between 20-40mm.
6. the internal-rib bellows of band injection electric heating melting bell and spigot joint according to claim 4, which is characterized in that the annular
Flange collar thickness is between 3-10mm.
7. the production of the band injection electric heating melting bell and spigot joint internal-rib bellows internal-rib bellows injection moulding connector described in claim 1-6
Method, its step are as follows：
A. by internal-rib bellows fixed length cutting, both ends of the surface truncation；
B. ripple is milled away, remainder forms annular surface, and annular surface is wider than equal to 20mm, the annular bead on annular surface
Thickness is more than or equal to 3mm；
C. tubing is put into injection machine mould and be molded, placement heater wire is needed to embed bellmouth；
D. overlap is handled, connector finishing.
8. the life of band injection electric heating melting bell and spigot joint internal-rib bellows internal-rib bellows injection moulding connector according to claim 7
Production method, which is characterized in that the annular bead Thickness ness is between 3-10mm, and annular surface width is between 20-40mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711313034.6A CN108180325A (en) | 2017-12-07 | 2017-12-07 | A kind of production method of band injection electric heating melting bell and spigot joint internal-rib bellows and its connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711313034.6A CN108180325A (en) | 2017-12-07 | 2017-12-07 | A kind of production method of band injection electric heating melting bell and spigot joint internal-rib bellows and its connector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108180325A true CN108180325A (en) | 2018-06-19 |
Family
ID=62546048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711313034.6A Pending CN108180325A (en) | 2017-12-07 | 2017-12-07 | A kind of production method of band injection electric heating melting bell and spigot joint internal-rib bellows and its connector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108180325A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108995259A (en) * | 2018-07-19 | 2018-12-14 | 福建祥云科创新型管业科技有限公司 | A kind of production technology of injection molding joint |
| CN110480918A (en) * | 2019-07-31 | 2019-11-22 | 康泰塑胶科技集团有限公司 | A kind of high strength pipe molding equipment and its forming method |
| CN110884102A (en) * | 2019-11-15 | 2020-03-17 | 广东雄塑科技集团股份有限公司 | Corrugated pipe socket head processing method and product |
| CN112082004A (en) * | 2020-09-23 | 2020-12-15 | 云南傲远智能环保科技有限公司 | Production method of double-wave-crest plastic pipeline with socket |
| CN113404937A (en) * | 2021-05-27 | 2021-09-17 | 莆田市滨渡商贸有限公司 | Cross-linked polyethylene composite double-wall winding pipe |
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| CN107053595A (en) * | 2016-11-07 | 2017-08-18 | 广东永高塑业发展有限公司 | A kind of electro-fusion socket formula winding tube faucet mould and its application method |
| CN206439523U (en) * | 2016-12-02 | 2017-08-25 | 昆山普拉斯克机械制造有限公司 | Winding structure pipe fitting |
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