CN114508633A - Novel annular reinforced polyethylene composite plastic pipeline - Google Patents
Novel annular reinforced polyethylene composite plastic pipeline Download PDFInfo
- Publication number
- CN114508633A CN114508633A CN202210039218.2A CN202210039218A CN114508633A CN 114508633 A CN114508633 A CN 114508633A CN 202210039218 A CN202210039218 A CN 202210039218A CN 114508633 A CN114508633 A CN 114508633A
- Authority
- CN
- China
- Prior art keywords
- layer
- reinforcing
- polyethylene
- bonding
- composite
- 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.)
- Pending
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 18
- -1 polyethylene Polymers 0.000 title claims abstract description 17
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 17
- 229920003023 plastic Polymers 0.000 title claims abstract description 13
- 239000004033 plastic Substances 0.000 title claims abstract description 13
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 229920013716 polyethylene resin Polymers 0.000 claims abstract description 14
- 229920005989 resin Polymers 0.000 claims abstract description 8
- 239000011347 resin Substances 0.000 claims abstract description 8
- 229910000639 Spring steel Inorganic materials 0.000 claims abstract description 7
- 238000004804 winding Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000003723 Smelting Methods 0.000 abstract description 2
- 230000002262 irrigation Effects 0.000 abstract description 2
- 238000003973 irrigation Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 54
- 239000012790 adhesive layer Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 239000004840 adhesive resin Substances 0.000 description 4
- 229920006223 adhesive resin Polymers 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000003712 anti-aging effect Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Images
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
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
-
- 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
-
- 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
-
- 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
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to a novel annular reinforced polyethylene composite plastic pipeline which comprises a composite layer, wherein the composite layer is of a six-layer composite structure and sequentially comprises an inner layer, a first bonding layer, a reinforcing layer, a reinforced layer, a second bonding layer and an outer layer from inside to outside, the inner layer is made of polyethylene resin, the first bonding layer and the second bonding layer are made of bonding resin, the reinforcing layer is made of high-strength steel wires, the reinforced layer is made of spring steel wires, and the outer layer is made of polyethylene resin. This novel compound plastic conduit of reinforcing polyethylene is strengthened to hoop, compound tubular product inner wall adopts the polyethylene resin material, consequently there is not the corrosion problems, spiral cross winding and hoop winding reinforcing about through the steel wire, effectively reduce the resin quantity, the pipeline can adopt electric smelting muffjoint, safe and reliable, in water supply and drainage pipe field, even farmland low pressure irrigation field, can replace traditional steel pipe, it is corrosion-resistant to have, it is low to synthesize the cost, long service life, a great deal of advantage such as later maintenance low becomes, easily popularization.
Description
Technical Field
The invention relates to the technical field of composite plastic pipelines, in particular to a novel annular reinforced and reinforced polyethylene composite plastic pipeline.
Background
At present, wire net reinforcing polyethylene composite pipe is because of its advantages such as corrosion-resistant, health, simple to operate, and the wide application is defeated water, irrigates the field, nevertheless because traditional wire net reinforcing polyethylene pipeline adopts the steel wire alternately winding reinforcing structure, and the steel wire twines with 54.7 angles more, and the steel wire number of piles generally is bilayer or four layers, and the not enough that this kind of pipeline embodies at the actual motion in-process is: the number of winding layers and the number of steel wires are large, the ring stiffness is limited, the ring stiffness needs to be improved by adding a resin layer, and the cost advantage is not obvious.
At present, the problem cannot be well solved in the known patents or the prior art, so a novel annular reinforced and reinforced polyethylene composite pipeline is provided
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a novel annular reinforced polyethylene composite plastic pipeline, the nominal pressure of the pipeline can reach 2.5MPa, the long-term service life of the pipeline can reach more than 50 years, and the problems are effectively solved.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a novel hoop reinforcement enhancement polyethylene composite plastic pipeline, includes the composite bed, the composite bed is six layers of composite construction, and is inlayer, first adhesive linkage, enhancement layer, reinforcement layer, second adhesive linkage and skin from inside to outside in proper order.
Further, the inner layer is made of polyethylene resin, the first bonding layer and the second bonding layer are made of bonding resin, the reinforcing layer is made of high-strength steel wires, the stiffening layer is made of spring steel wires, and the outer layer is made of polyethylene resin. The reinforcing layer is formed by spirally and crosswise winding a high-strength steel wire at an inclination angle of 49 degrees with the radial direction, and has the characteristics of high circumferential and radial strength and less wire consumption.
Further, the inner layer and the outer layer are polyethylene resin of PE100 grade or PE80 grade. The stiffening layer adopts a spring steel wire and is wound along the annular direction of the pipe, so that the stiffening layer has the characteristic of stiffening.
Compared with the prior art, the technical scheme of the application has the following beneficial effects:
this novel compound plastic conduit of reinforcing polyethylene is strengthened to hoop, compound tubular product inner wall adopts the polyethylene resin material, consequently there is not the corrosion problems, spiral cross winding and hoop winding reinforcing about through the steel wire, effectively reduce the resin quantity, the pipeline can adopt electric smelting muffjoint, safe and reliable, in water supply and drainage pipe field, even farmland low pressure irrigation field, can replace traditional steel pipe, it is corrosion-resistant to have, it is low to synthesize the cost, long service life, a great deal of advantage such as later maintenance low becomes, easily popularization.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a left side sectional view of the inventive structure.
In the figure: 1 inner layer, 2 first adhesive layer, 3 reinforcing layer, 4 stiffening layer, 5 second adhesive layer and 6 outer layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the novel circumferential reinforced polyethylene composite plastic pipe in the embodiment includes a composite layer, which is a six-layer composite structure and includes an inner layer 1, a first adhesive layer 2, a reinforcing layer 3, a reinforcing layer 4, a second adhesive layer 5, and an outer layer 6 in sequence from inside to outside.
The inner layer 1 is made of polyethylene resin, the first bonding layer 2 and the second bonding layer 5 are made of bonding resin, the reinforcing layer 3 is made of high-strength steel wire, the stiffening layer 4 is made of spring steel wire, and the outer layer 6 is made of polyethylene resin. The reinforcing layer 3 is formed by spirally and crosswise winding a high-strength steel wire at an inclination angle of 49 degrees with the radial direction, and has the characteristics of high circumferential and radial strength and small wire consumption.
The inner layer 1 and the outer layer 6 are PE100 grade or PE80 grade polyethylene resins. The stiffening layer 4 adopts a spring steel wire and is wound along the annular direction of the pipe, and the stiffening layer has the characteristic of reinforcing and stiffening.
The polyethylene resins of the inner layer 1 and the outer layer 6 are PE 100-grade high-performance polyethylene mixed materials, have the characteristics of corrosion resistance, heat resistance, pressure resistance and the like, and are added with the anti-aging master batches according to a certain proportion to increase the anti-aging performance.
The steel wire of the reinforcing layer 3 is a high-strength aluminum-plated steel wire, and can be better tightly bonded with the adhesive resin layer by utilizing the characteristics of metal aluminum.
The steel wire of the stiffening layer 4 is a carbon spring steel wire, the inclination angle of the steel wire is determined by the proportion of the distribution width and the pipe diameter of the steel wire, and the angle between the steel wire and the section of the pipe is 5-10 degrees.
The adhesive resin of the first adhesive layer 2 and the second adhesive layer 5 is an adhesive resin using polyolefin graft ethylene copolymer and maleic anhydride copolymer as a matrix, and the adhesive resin can form ionic bond with metal aluminum of the outer surface layer of the aluminum-plated steel wire of the reinforcing layer 3, and shows good adhesive strength.
As the six-layer composite structure is adopted, when fluid is conveyed, the inner polyethylene pipe of the inner layer 1 bears conveying pressure, the compressive strength is improved through the reinforcing layer 3, the hoop allowable stress is increased, the hoop winding structure of the rigid layer 4 is increased, and the hoop rigidity of the pipe can be effectively increased, so that the application of resin materials of the inner layer 1 and the outer layer 6 is further reduced, and the material cost is reasonably reduced. The material properties of the adhesive layer 2 and the adhesive layer 5 enable the reinforcing layer 3 and the stiffening layer 4 to be tightly bonded to the inner layer 1 and the outer layer 6, respectively.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The utility model provides a novel hoop reinforcing polyethylene composite plastic pipeline, includes the composite bed, its characterized in that: the composite layer is of a six-layer composite structure and sequentially comprises an inner layer (1), a first bonding layer (2), a reinforcing layer (3), a stiffening layer (4), a second bonding layer (5) and an outer layer (6) from inside to outside.
2. The novel circumferential reinforced polyethylene composite plastic pipeline according to claim 1, characterized in that: the inner layer (1) is made of polyethylene resin, the first bonding layer (2) and the second bonding layer (5) are made of bonding resin, the reinforcing layer (3) is made of high-strength steel wires, and the stiffening layer (4) is made of spring steel wire outer layer (6) made of polyethylene resin.
3. The novel circumferential reinforced polyethylene composite plastic pipeline according to claim 1, characterized in that: the inner layer (1) and the outer layer (6) are PE100 grade or PE80 grade polyethylene resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210039218.2A CN114508633A (en) | 2022-01-13 | 2022-01-13 | Novel annular reinforced polyethylene composite plastic pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210039218.2A CN114508633A (en) | 2022-01-13 | 2022-01-13 | Novel annular reinforced polyethylene composite plastic pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114508633A true CN114508633A (en) | 2022-05-17 |
Family
ID=81550064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210039218.2A Pending CN114508633A (en) | 2022-01-13 | 2022-01-13 | Novel annular reinforced polyethylene composite plastic pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114508633A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962804A (en) * | 2022-06-08 | 2022-08-30 | 宁夏青龙塑料管材有限公司 | Steel wire wound composite pipeline for hydrogen transportation and manufacturing method thereof |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1334025A (en) * | 1971-06-15 | 1973-10-17 | Orszagos Gumiipari Vallalat | Flexible high-strength wire-reinforced rubber hoses |
| CN1208144A (en) * | 1998-07-24 | 1999-02-17 | 侯贤忠 | GRP-thin wall stainless steel composite pipe and its making process |
| EP0969236A2 (en) * | 1998-06-29 | 2000-01-05 | Parker Hannifin GmbH | Kink resistant high pressure hose |
| JP2003014165A (en) * | 2001-07-03 | 2003-01-15 | Mesco Inc | Fluid transferring plastic pipe |
| CN2818981Y (en) * | 2005-09-03 | 2006-09-20 | 淄博恒和塑胶有限公司 | Steel wire reinforced polythene composite piping material under coal mine |
| US20080185063A1 (en) * | 2007-02-01 | 2008-08-07 | Eaton Corporation | Braided hose and method of making same |
| JP2009204143A (en) * | 2008-02-29 | 2009-09-10 | Bridgestone Corp | Water supply or hot water supply hose |
| CN204533875U (en) * | 2015-02-12 | 2015-08-05 | 赣州市强发管业有限公司 | A kind of high pressure high abrasion steel wire winding pvc pipe |
| CN205371845U (en) * | 2016-02-17 | 2016-07-06 | 新疆天茂新型材料科技股份有限公司 | Anticorrosive compound tubular product of losing nature steel mesh skeleton polyethylene that hinders |
| JP2017106554A (en) * | 2015-12-10 | 2017-06-15 | 横浜ゴム株式会社 | High pressure hose |
| CN206694677U (en) * | 2017-04-20 | 2017-12-01 | 张家港市瑞特金属材料有限公司 | A kind of braided steel wire reinforced composite pipe |
| CN112303346A (en) * | 2020-10-30 | 2021-02-02 | 邓权塑业科技（湖南）有限公司 | Steel wire mesh reinforced composite pipe |
-
2022
- 2022-01-13 CN CN202210039218.2A patent/CN114508633A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1334025A (en) * | 1971-06-15 | 1973-10-17 | Orszagos Gumiipari Vallalat | Flexible high-strength wire-reinforced rubber hoses |
| EP0969236A2 (en) * | 1998-06-29 | 2000-01-05 | Parker Hannifin GmbH | Kink resistant high pressure hose |
| CN1208144A (en) * | 1998-07-24 | 1999-02-17 | 侯贤忠 | GRP-thin wall stainless steel composite pipe and its making process |
| JP2003014165A (en) * | 2001-07-03 | 2003-01-15 | Mesco Inc | Fluid transferring plastic pipe |
| CN2818981Y (en) * | 2005-09-03 | 2006-09-20 | 淄博恒和塑胶有限公司 | Steel wire reinforced polythene composite piping material under coal mine |
| US20080185063A1 (en) * | 2007-02-01 | 2008-08-07 | Eaton Corporation | Braided hose and method of making same |
| JP2009204143A (en) * | 2008-02-29 | 2009-09-10 | Bridgestone Corp | Water supply or hot water supply hose |
| CN204533875U (en) * | 2015-02-12 | 2015-08-05 | 赣州市强发管业有限公司 | A kind of high pressure high abrasion steel wire winding pvc pipe |
| JP2017106554A (en) * | 2015-12-10 | 2017-06-15 | 横浜ゴム株式会社 | High pressure hose |
| CN205371845U (en) * | 2016-02-17 | 2016-07-06 | 新疆天茂新型材料科技股份有限公司 | Anticorrosive compound tubular product of losing nature steel mesh skeleton polyethylene that hinders |
| CN206694677U (en) * | 2017-04-20 | 2017-12-01 | 张家港市瑞特金属材料有限公司 | A kind of braided steel wire reinforced composite pipe |
| CN112303346A (en) * | 2020-10-30 | 2021-02-02 | 邓权塑业科技（湖南）有限公司 | Steel wire mesh reinforced composite pipe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962804A (en) * | 2022-06-08 | 2022-08-30 | 宁夏青龙塑料管材有限公司 | Steel wire wound composite pipeline for hydrogen transportation and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204493928U (en) | A kind of thermosetting bamboo wood composite pipe | |
| CN105715882A (en) | Small-caliber bamboo winding composite pipe and manufacturing method thereof | |
| CN109555909A (en) | Double-walled internal-rib fiberglass sandwich concrete high-strength degree compound pipeline complex pipeline and its processing method | |
| CN103712000A (en) | Multi-layer wound composite tube | |
| CN114508633A (en) | Novel annular reinforced polyethylene composite plastic pipeline | |
| CN205978862U (en) | High density polyethylene double -walled bellows with new wave form | |
| CN206539786U (en) | A kind of composite oil-gas pipeline | |
| CN207584207U (en) | A kind of steel strip winding continuously enhances non-adherent flexible composite pipe | |
| CN105909885A (en) | Prestressed cylinder concrete and plastic composite pipe and construction method thereof | |
| CN204254065U (en) | A kind of fiber reinforcement corrosion resistant alloy composite pipe | |
| CN201326838Y (en) | Steel-plastic composite pipe | |
| CN215635462U (en) | Wear-resistant reinforced steel-plastic composite pipe | |
| CN206846110U (en) | A kind of distortion-free glass reinforced plastic push pipe of the sealing of sandwich construction | |
| CN209705444U (en) | Double-walled internal-rib fiberglass sandwich concrete high-strength degree compound pipeline complex pipeline | |
| CN211599801U (en) | Steel skeleton reinforced polyethylene composite pipe | |
| CN207049457U (en) | PRSG is buried to use high-strength composite plastic drainpipe | |
| CN202001739U (en) | Double-wall twined pipe made from HDPE (high density polyethylene) steel strip | |
| CN204083558U (en) | A kind of electromagnetic valve intake pipe | |
| CN213393920U (en) | Xuan-plastic blended polyethylene pipeline | |
| CN211289063U (en) | High-temperature-resistant steel-band reinforced polyethylene spiral corrugated pipe | |
| CN213393921U (en) | Square plastic-in-brown pipeline with polyethylene | |
| CN210920386U (en) | High-performance PE steel wire mesh framework pipe | |
| CN218118922U (en) | Krah pipe with reinforcing structure | |
| CN203671062U (en) | Multi-layer winding composite pipe | |
| CN202532038U (en) | Dual-complex steel-plastic composite pipe |
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 | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhao Mingliang Inventor after: Li Yongfeng Inventor after: Yu Jiangtao Inventor after: Li Zhilong Inventor after: Hui Kang Inventor after: Chen Haitao Inventor after: Zhang Qi Inventor after: Zhou Wenyi Inventor before: Zhao Mingliang |
|
| CB03 | Change of inventor or designer information | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20220517 |