CN107289220A - A kind of enhanced composite electric melting sleeve and preparation method thereof - Google Patents
A kind of enhanced composite electric melting sleeve and preparation method thereof Download PDFInfo
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- CN107289220A CN107289220A CN201610194296.4A CN201610194296A CN107289220A CN 107289220 A CN107289220 A CN 107289220A CN 201610194296 A CN201610194296 A CN 201610194296A CN 107289220 A CN107289220 A CN 107289220A
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- heating wire
- electric melting
- binding post
- intensifier
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of enhanced composite electric melting sleeve, including plastic substrate (4), intensifier (3) and heater, intensifier (3) is embedded in the position of the axial centre of plastic substrate (4) inwall, heater is located at the two ends of plastic substrate (4) inwall, and the plastic substrate (4) is an annular sleeve.The invention also discloses a kind of preparation method of above-mentioned enhanced composite electric melting sleeve.Intensifier is high with plastic substrate interface binding intensity in the present invention, and the two fuses into one completely, will not be layered；Intensifier is consistent with plastic substrate thermal coefficient of expansion, and in enhanced composite electric melting sleeve electrified regulation, intensifier will not hinder the expansion of plastic substrate, has good welding effect in pipeline and enhanced composite electric melting sleeve intersection, and connection reliability is high；Joint bearing capacity is high, can be applied to the middle pressure field that pressure is more than 1.6MPa.
Description
Technical field
The invention belongs to pipe fitting manufacture and engineering interconnection technique field, it is related to a kind of pipeline connecting pipe part and preparation method thereof.
Background technology
Electric melting sleeve is a kind of very important jointing in plastic conduit connection, and unidirectional pipeline is firmly welding in
Together, domestic electric melting sleeve most of at present is all the pure plastic injection electric melting sleeve such as PE, PVC, pure plastic electrofusion pipe fitting with
The connection of tubing is the electric-heating-wire-heating laid by pure plastic electrofusion pipe fitting bell and spigot inwall, first causes tubing and pipe fitting expanded by heating,
The air between outer pipe wall and pipe fitting inner wall is excluded, the voltage for then increasing supply heating wire causes interface resin thoroughly to melt,
And then cause pipe fitting to connect into permanent connection with producing polymer melting at tubing linkage interface, between pure plastic pipe part and tubing
Consubstantiality welding, welding effect is preferably, easy to connect reliable, but pure plastic electrofusion pipe fitting highest bears pressure for 1.6MPa, only
Low pressure occasion is can apply to, and some mesohigh fields can not be applied to.When applied to occasion more than 1.6MPa, pure plastics
The bearing capacity and security reliability of pipe fitting, which lack, to be ensured.
At present, more than 1.6MPa using pressure pipe applications it is more have steel wire mesh frame plastic (polyethylene) multiple tube,
Steel skeleton enhanced polymer electric melting pipe fittings are used when being applied more than 1.6MPa, steel skeleton polymer pipe fitting uses band mesh steel skeleton
Or steel-wire carcass welding reinforcement, injection molded polyethylene thermoplastic, Ran Hou on band mesh steel skeleton or steel-wire carcass
Pipe fitting inner wall spiral winding heating wire is prepared from.Because steel skeleton is when body or pipe fitting are heated, to body or pipe fitting
Inhibition is played in expansion, so completely gap between outer pipe wall and pipe fitting inner wall and air can not be drained, Jin Erying
Ring to the connection reliability between steel wire mesh frame plastic (polyethylene) multiple tube and steel skeleton enhancing polymer electric melting pipe fittings.Specially
Sharp CN1431421A has disclosed hole composite polymer pipe joint with reinforced wire frame, can improve above-mentioned ask to a certain extent
Topic, but can not fundamentally solve this problem.Moreover steel frame-plastic composite electric melting sleeve, by plastic substrate, band net
Hole steel skeleton and heating wire composition, band mesh steel skeleton belong to two kinds of complete different materials with plastic substrate, over time
Easily layering.
The content of the invention
In order to solve the problem of existing electric melting sleeve technology is present, it is an object of the invention to provide a kind of enhanced composite electric melting sleeve,
Its enhancement layer is high with plastic substrate interface binding intensity, and the two fuses into one completely, will not be layered.
To achieve these goals, technical scheme is as follows：
A kind of enhanced composite electric melting sleeve, including plastic substrate, intensifier and heater, intensifier are embedded in plastics
The position of the axial centre of matrix inwall, heater is located at the two ends of plastic substrate inwall.
The plastic substrate is an annular sleeve.
The internal diameter of the enhanced composite electric melting sleeve and the external diameter of pipeline match.
The base material of the plastic substrate is polyethylene, polypropylene, polyvinyl chloride or polyamide, preferably polyethylene.
The intensifier is obtained by continuous fiber reinforced thermoplastic resin composite material band cross winding, with several
The annular tube-in-tube structure of hole.
The continuous fiber is continuous glass fibre, continuous carbon fibre, continuous aramid fiber, continuous basalt fiber or continuous
Polyester fiber, preferably continuous glass fibre.
The thermoplastic resin can be polyethylene, polypropylene, polyvinyl chloride or polyamide, the selection of resin matrix and pipe
Road material is consistent, preferably polyethylene.
Area shared by several described holes accounts for the 20~40% of the total surface area of intensifier.
The heater includes first group of heating wire, first binding post, second group of heating wire and second binding post, described
First group of heating wire is connected the path to form closure with first binding post, and second group of heating wire connects with described second
Terminal connects the path to form closure, and first group of heating wire is laid in plastic substrate inwall respectively with second group of heating wire
Two ends, first binding post and second binding post are located at the two ends of plastic substrate outer wall respectively.
First group of heating wire and second group of heating wire are copper resistance silk, nichrome, ferrochrome or corronil.
A kind of preparation method of above-mentioned enhanced composite electric melting sleeve, comprises the following steps：
Annular tube-in-tube structure is obtained using the winding of continuous fiber reinforced thermoplastic resin composite material band left-and-right spiral, is increased
Intensity device；Continuous fiber reinforced thermoplastic resin composite material band is when left-hand screw is wound, adjacent continuous fiber reinforced thermolplastic
Hole is left between resin composite materials band, continuous fiber reinforced thermoplastic resin composite material band when right-hand screw is wound,
Hole is left between adjacent continuous fiber-reinforced thermoplastic resin composite band；
By intensifier in advance be embedded in injection mold in, then using injection machine toward injection-moulded plastic matrix in mould base material, finally
First binding post and second binding post are added, the enhanced composite electric melting sleeve with binding post is obtained；
The first group of heating wire and second group of heating wire of heater are laid in sleeve lining by routing machine；By laid first
Group heating wire and second group of heating wire are connected respectively with first binding post and second binding post, form conductive path.
By adopting the above-described technical solution, the present invention has advantages below and beneficial effect：
Intensifier is high with plastic substrate interface binding intensity in the present invention, and the two fuses into one completely, will not be layered；Enhancing dress
Put consistent with plastic substrate thermal coefficient of expansion, in enhanced composite electric melting sleeve electrified regulation, intensifier will not hinder plastics
The expansion of matrix, has good welding effect in pipeline and enhanced composite electric melting sleeve intersection, and connection reliability is high；Connect
Head bearing capacity is high, can be applied to the middle pressure field that pressure is more than 1.6MPa.
Brief description of the drawings
Fig. 1 is the structural representation of the enhanced composite electric melting sleeve of the embodiment of the present invention.
Fig. 2 is the structural representation of intensifier.
In figure：11 be first group of heating wire, and 12 be second group of heating wire, and 21 be first binding post, and 22 be second wiring
Post, 3 be intensifier, and 4 be plastic substrate, and 5 be pipeline, and 31 be continuous fiber reinforced thermoplastic resin composite material band,
32 be hole.
Embodiment
The present invention is further detailed explanation for illustrated embodiment below in conjunction with the accompanying drawings.
Embodiment 1
As shown in figure 1, structural representations of the Fig. 1 for the enhanced composite electric melting sleeve of the embodiment of the present invention.
A kind of enhanced composite electric melting sleeve, including plastic substrate 4, intensifier 3 and heater, intensifier 3 are embedded in
In the position of the axial centre of the inwall of plastic substrate 4, heater is located at the two ends of the inwall of plastic substrate 4.Plastic substrate 4
It is an annular sleeve, the external diameter of the internal diameter and pipeline 5 of enhanced composite electric melting sleeve matches, the material of plastic substrate 4
For polyethylene, the material of pipeline 5 is PE materials.
Intensifier 3 strengthens the cross winding of composite polyethylene material band 31 by continuous glass fibre and obtained, with several
The annular tube-in-tube structure of hole 32.As shown in Fig. 2 Fig. 2 is the structural representation of intensifier.Several institutes of hole 32
The area accounted for accounts for the 20~40% of the total surface area of intensifier 3.Continuous fiber reinforced thermoplastic resin composite material band 31 exists
When left-hand screw is wound, hole 32, continuous fiber are left between adjacent continuous fiber-reinforced thermoplastic resin composite band 31
Strengthen thermoplas tic resin composite's band 31 when right-hand screw is wound, adjacent continuous fiber-reinforced thermoplastic resin composite material tape
Hole 32 is left between material 31.
Heater includes first group of heating wire 11, first binding post 21, second group of heating wire 12 and second binding post 22,
First group of heating wire 11 be connected with first binding post 21 formed closure path, second group of heating wire 12 with
Second binding post 22 connection forms the path of closure, first binding post 21 and 22 points of second binding post
Not Wei Yu the outer wall of plastic substrate 4 two ends.
First group of heating wire 11 and second group of heating wire 12 are copper resistance silk, and electricity is laid in enhancing sleeve lining by routing machine
Silk is hindered, conduction region can be formed after shaping at the inwall at enhanced composite electric melting sleeve two ends, first binding post 21 and second
Binding post 22 is attached respectively with first group of heating wire 11 and second group of heating wire 12 respectively.In enhanced compound electric after energization
It is molten that melting connection is formed between sleeve lining and the outer wall of pipeline 5.
By in intensifier 3 in advance embedded injection mold, then using injection machine toward injection-moulded plastic matrix 4 in mould base material
HDPE resin, the resin of injection passes through the mold filling of hole 32 of intensifier 3 in the presence of injection molding, and intensifier 3 is embedding
Enter in plastic substrate 4, be eventually adding first binding post 21 and second binding post 22, obtain the enhancing with binding post
Type composite electric melting sleeve；The first group of heating wire 11 and second group of heating wire of heater are laid in sleeve lining by routing machine
12；By laid first group of heating wire 11 and second group of heating wire 12 and first binding post 21 and second binding post 22
Connect respectively, form conductive path.
Embodiment 2
A kind of enhanced composite electric melting sleeve, including first group of heating wire 11, second group of heating wire 12, intensifier 3 and poly- third
Alkene plastics matrix 4.First group of heating wire 11, second group of heating wire 12 are after electric melting pipe fittings shaping, by being laid in after routing machine
Pipe fitting two ends inwall, first group of heating wire 11 and second group of heating wire 12 are corronil, first binding post 21 and second
Individual binding post 22 is attached respectively with first group of heating wire 11 and second group of heating wire 12 respectively.Enhanced compound after energization
Melting connection is formed between electric melting sleeve inwall and the outer wall of polypropylene material pipeline 5.First binding post 21 and second binding post
22 are arranged at electric melting sleeve two ends.Intensifier 3 is intersected by continuous glass fiber reinforced polypropylene composite material band 31
It is entwined, intersection hole 32 is left in forming process, intensifier 3 is embedded in injection mold in advance as inserts, then
It is molded by being molded acrylic resin, the resin of injection passes through the mold filling of hole 32 of intensifier 3 in the presence of injection molding,
Intensifier 3 is embedded in plastic substrate 4, positioned at the axial middle of electric melting sleeve.
Embodiment 3
A kind of enhanced composite electric melting sleeve, including first group of heating wire 11, second group of heating wire 12, intensifier 3 and polychlorostyrene
Vinyl plastics matrix 4.First group of heating wire 11, second group of heating wire 12 are after electric melting pipe fittings shaping, by being laid after routing machine
In pipe fitting two ends inwall, first group of heating wire 11, second group of heating wire 12 are copper resistance silk, first binding post 21 and the
Two binding posts 22 are attached respectively with first group of heating wire 11 and second group of heating wire 12 respectively.Enhanced multiple after energization
Close and melting connection is formed between electric melting sleeve inwall and the outer wall of polyvinyl chloride material pipeline 5.First binding post 21 and second connect
Terminal 22 is arranged at electric melting sleeve radial direction two ends.Intensifier 3 passes through continuous glass fibre reinforced polyvinyl chloride composite material tape
The cross winding of material 31 is formed, and intersection hole 32 is left in forming process, and intensifier 3 is embedded in injection mould in advance as inserts
In tool, then it is molded by being molded Corvic, the resin of injection passes through intensifier 3 in the presence of injection molding
The mold filling of hole 32, intensifier 3 is embedded in plastic substrate 4, positioned at the axial middle of electric melting sleeve.
The continuous fiber reinforced thermoplastic resin composite material used in above-described embodiment is by the outstanding new material (group) of the outstanding thing in Shanghai
Limited company provides, and other materials is commercially available.
Embodiment 4
Annular tube-in-tube structure is obtained using the winding of the left-and-right spiral of continuous carbon fibre reinforced polyamide resin composite materials band 31, is obtained
To intensifier 3；Continuous carbon fibre reinforced polyamide resin composite materials band 31 is when left-hand screw is wound, and adjacent continuous carbon is fine
Hole 32, continuous carbon fibre reinforced polyamide resin composite materials are left between dimension reinforced polyamide resin composite materials band 31
Band 31 leaves hole 32 when right-hand screw is wound between adjacent continuous carbon fiber reinforced polyamide resin composite materials band 31；
Area shared by all holes 32 accounts for the 20~40% of the total surface area of intensifier 3.
By in intensifier 3 in advance embedded injection mold, then gathered using the base material of injection machine toward injection-moulded plastic matrix 4 in mould
Amide resin, is eventually adding first binding post 21 and second binding post 22, obtains the enhanced compound electric with binding post
Molten sleeve；The first group of heating wire 11 and second group of heating wire 12 of heater are laid in sleeve lining by routing machine；By cloth
If good first group of heating wire 11 and second group of heating wire 12 is connected respectively with first binding post 21 and second binding post 22
Get up, form conductive path.
Obtained enhanced composite electric melting sleeve includes plastic substrate 4, intensifier 3 and heater, and intensifier 3 is embedded in
In the position of the axial centre of the inwall of plastic substrate 4, heater is located at the two ends of the inwall of plastic substrate 4.Plastic substrate 4
It is an annular sleeve；The external diameter of the internal diameter of enhanced composite electric melting sleeve and polyamide pipeline 5 matches.
Heater includes first group of heating wire 11, first binding post 21, second group of heating wire 12 and second binding post 22,
First group of heating wire 11 is connected the path for forming closure, second group of heating wire 12 and second binding post with first binding post 21
22 connections form the path of closure, and first group of heating wire 11 and second group of heating wire 12 are laid in the inwall of plastic substrate 4 respectively
Two ends, first binding post 21 and second binding post 22 are located at the two ends of the outer wall of plastic substrate 4 respectively.First group of heating wire
11 and second group of heating wire 12 be nichrome.
Embodiment 5
Annular tube-in-tube structure is obtained using the winding of the left-and-right spiral of continuous polycondensation fiber reinforcement composite polyethylene material band 31, is obtained
Intensifier 3；Continuous polycondensation fiber reinforcement composite polyethylene material band 31 is when left-hand screw is wound, adjacent continuous polyester fiber
Hole 32 is left between enhancing composite polyethylene material band 31, continuous polycondensation fiber reinforcement composite polyethylene material band 31 exists
When right-hand screw is wound, hole 32 is left between adjacent continuous polyester fiber enhancing composite polyethylene material band 31；All holes
Area shared by 32 accounts for the 20~40% of the total surface area of intensifier 3.
By in intensifier 3 in advance embedded injection mold, then gathered using the base material of injection machine toward injection-moulded plastic matrix 4 in mould
Ethene, is eventually adding first binding post 21 and second binding post 22, obtains the enhanced composite electric melting set with binding post
Cylinder；The first group of heating wire 11 and second group of heating wire 12 of heater are laid in sleeve lining by routing machine；It will lay
First group of heating wire 11 and second group of heating wire 12 connected respectively with first binding post 21 and second binding post 22,
Form conductive path.
Obtained enhanced composite electric melting sleeve includes plastic substrate 4, intensifier 3 and heater, and intensifier 3 is embedded in
In the position of the axial centre of the inwall of plastic substrate 4, heater is located at the two ends of the inwall of plastic substrate 4.Plastic substrate 4
It is an annular sleeve；The external diameter of the internal diameter of enhanced composite electric melting sleeve and polyethylene pipe 5 matches.
Heater includes first group of heating wire 11, first binding post 21, second group of heating wire 12 and second binding post 22,
First group of heating wire 11 is connected the path for forming closure, second group of heating wire 12 and second binding post with first binding post 21
22 connections form the path of closure, and first group of heating wire 11 and second group of heating wire 12 are laid in the inwall of plastic substrate 4 respectively
Two ends, first binding post 21 and second binding post 22 are located at the two ends of the outer wall of plastic substrate 4 respectively.First group of heating wire
11 and second group of heating wire 12 be ferrochrome.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using the present invention.It is familiar with
The personnel of art technology obviously can easily make various modifications to these embodiments, and should General Principle described herein
Use in other embodiment without passing through performing creative labour.Therefore, the invention is not restricted to embodiment here, this area skill
Art personnel according to the announcement of the present invention, do not depart from improvement and modification that scope made all should the present invention protection model
Within enclosing.
Claims (10)
1. a kind of enhanced composite electric melting sleeve, it is characterised in that：Including plastic substrate (4), intensifier (3) and heating
Device, intensifier (3) is embedded in the position of the axial centre of plastic substrate (4) inwall, and heater is located at plastics base
The two ends of body (4) inwall.
2. enhanced composite electric melting sleeve according to claim 1, it is characterised in that：The plastic substrate (4) is one
Individual annular sleeve；
It is preferred that, the base material of the plastic substrate (4) is polyethylene, polypropylene, polyvinyl chloride or polyamide, is preferably gathered
Ethene；
It is preferred that, the external diameter of the internal diameter and pipeline (5) of the enhanced composite electric melting sleeve matches.
3. enhanced composite electric melting sleeve according to claim 1, it is characterised in that：The intensifier (3) be by
Continuous fiber reinforced thermoplastic resin composite material band (31) cross winding is obtained, the circle with several holes (32)
Annulus structure.
4. enhanced composite electric melting sleeve according to claim 3, it is characterised in that：The continuous fiber is continuous glass
Fiber, continuous carbon fibre, continuous aramid fiber, continuous basalt fiber or continuous polycondensation fiber, preferably continuous glass fibre.
5. enhanced composite electric melting sleeve according to claim 3, it is characterised in that：The thermoplastic resin be polyethylene,
Polypropylene, polyvinyl chloride or polyamide, preferably polyethylene.
6. enhanced composite electric melting sleeve according to claim 3, it is characterised in that：Several described hole (32) institutes
The area accounted for accounts for the 20~40% of the total surface area of intensifier (3).
7. enhanced composite electric melting sleeve according to claim 1, it is characterised in that：The heater includes first group
Heating wire (11), first binding post (21), second group of heating wire (12) and second binding post (22), described first group
Heating wire (11) be connected with first binding post (21) formed closure path, second group of heating wire (12) with
Second binding post (22) connection forms the path of closure, first group of heating wire (11) and second group of electric heating
Silk (12) is laid in the two ends of plastic substrate (4) inwall, first binding post (21) and second wiring respectively
Post (22) is located at the two ends of plastic substrate (4) outer wall respectively.
8. enhanced composite electric melting sleeve according to claim 7, it is characterised in that：First group of heating wire (11)
It is copper resistance silk, nichrome, ferrochrome or corronil with second group of heating wire (12).
9. a kind of preparation method of any described enhanced composite electric melting sleeve of claim 1~8, it is characterised in that：Including with
Lower step：
Annular tube-in-tube structure is obtained using the winding of continuous fiber reinforced thermoplastic resin composite material band (31) left-and-right spiral,
Obtain intensifier (3)；
By in intensifier (3) in advance embedded injection mold, then using injection machine toward injection-moulded plastic matrix (4) in mould
Base material, is eventually adding first binding post (21) and second binding post (22), obtains the enhanced compound electric with binding post
Molten sleeve；
The first group of heating wire (11) and second group of heating wire (12) of heater are laid in sleeve lining by routing machine；By cloth
If first group of good heating wire (11) and second group of heating wire (12) and first binding post (21) and second binding post (22)
Connect respectively, form conductive path.
10. the preparation method of enhanced composite electric melting sleeve according to claim 9, it is characterised in that：Continuous fiber increases
Heat-flash thermoplastic resin composite material band (31) is when left-hand screw is wound, adjacent continuous fiber-reinforced thermoplastic resin composite
Hole (32) is left between band (31), continuous fiber reinforced thermoplastic resin composite material band (31) is wound in right-hand screw
When, hole (32) is left between adjacent continuous fiber-reinforced thermoplastic resin composite band (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610194296.4A CN107289220A (en) | 2016-03-30 | 2016-03-30 | A kind of enhanced composite electric melting sleeve and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610194296.4A CN107289220A (en) | 2016-03-30 | 2016-03-30 | A kind of enhanced composite electric melting sleeve and preparation method thereof |
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| Publication Number | Publication Date |
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| CN107289220A true CN107289220A (en) | 2017-10-24 |
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ID=60087234
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610194296.4A Pending CN107289220A (en) | 2016-03-30 | 2016-03-30 | A kind of enhanced composite electric melting sleeve and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109373086A (en) * | 2018-12-20 | 2019-02-22 | 叶秋晨 | A kind of plastic conduit electric melting connection pipe fitting |
| CN111779909A (en) * | 2020-05-25 | 2020-10-16 | 宏升塑胶（杭州）有限公司 | Blow-off pipe system for subway construction |
| CN113586811A (en) * | 2021-07-02 | 2021-11-02 | 安徽杰蓝特新材料有限公司 | Injection molding type RTP plastic composite pressure pipe fitting and machining process thereof |
| CN115013602A (en) * | 2022-06-10 | 2022-09-06 | 宁夏青龙塑料管材有限公司 | Electric melting pipe fitting for high-pressure composite pipeline and manufacturing method thereof |
| CN115091769A (en) * | 2022-06-24 | 2022-09-23 | 江苏科技大学 | Electric fusion welding method for reinforced thermoplastic RTP (real time processing) pipe |
-
2016
- 2016-03-30 CN CN201610194296.4A patent/CN107289220A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109373086A (en) * | 2018-12-20 | 2019-02-22 | 叶秋晨 | A kind of plastic conduit electric melting connection pipe fitting |
| CN111779909A (en) * | 2020-05-25 | 2020-10-16 | 宏升塑胶（杭州）有限公司 | Blow-off pipe system for subway construction |
| CN113586811A (en) * | 2021-07-02 | 2021-11-02 | 安徽杰蓝特新材料有限公司 | Injection molding type RTP plastic composite pressure pipe fitting and machining process thereof |
| CN115013602A (en) * | 2022-06-10 | 2022-09-06 | 宁夏青龙塑料管材有限公司 | Electric melting pipe fitting for high-pressure composite pipeline and manufacturing method thereof |
| CN115091769A (en) * | 2022-06-24 | 2022-09-23 | 江苏科技大学 | Electric fusion welding method for reinforced thermoplastic RTP (real time processing) pipe |
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Application publication date: 20171024 |
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