CN111237552A - End face and port double-enhancement double-sealing device of metal plastic composite pipe and manufacturing method thereof - Google Patents
End face and port double-enhancement double-sealing device of metal plastic composite pipe and manufacturing method thereof Download PDFInfo
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- CN111237552A CN111237552A CN202010249425.1A CN202010249425A CN111237552A CN 111237552 A CN111237552 A CN 111237552A CN 202010249425 A CN202010249425 A CN 202010249425A CN 111237552 A CN111237552 A CN 111237552A
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- Prior art keywords
- metal
- ring
- reinforcing ring
- plastic composite
- composite pipe
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
- B29C65/562—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits using extra joining elements, i.e. which are not integral with the parts to be joined
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/021—Sealings between relatively-stationary surfaces with elastic packing
- F16J15/022—Sealings between relatively-stationary surfaces with elastic packing characterised by structure or material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Flanged Joints, Insulating Joints, And Other Joints (AREA)
- Gasket Seals (AREA)
Abstract
The utility model provides a compound pipe terminal surface of metal plastics and two sealing device of reinforcing of port, is including the compound pipe body of metal plastics, metal reinforcing ring and the sealing ring that has terminal surface and port, the metal reinforcing ring includes metal reinforcing ring body and sets up the turn-ups in metal reinforcing ring body one end, the cross-sectional profile shape of metal reinforcing ring with the cross-sectional profile shape of sealing ring is the same, the sealing ring cover is in the outer wall of metal reinforcing ring is located between metal reinforcing ring and the compound pipe body of metal plastics. The invention also comprises a manufacturing method of the double-reinforced double-sealing device for the end face and the port of the metal plastic composite pipe. The invention can simultaneously realize double strengthening and double sealing of the end surface and the port of the metal plastic composite pipe, prevent the end surface of the metal plastic composite pipe from directly contacting with water, and ensure that the plastic lining and the inner wall of the metal pipe are not peeled and cracked under the condition that the metal plastic composite pipe is filled with water for a long time.
Description
Technical Field
The invention relates to a double-enhancement double-sealing device for the end face and the port of a metal plastic composite pipe and a manufacturing method thereof.
Background
The metal plastic composite pipe has the characteristics of good mechanical property, sanitation, environmental protection, low energy consumption, high water delivery efficiency, low operation cost and the like, has the advantages of high strength, difficult deformation, no rustiness, acid and alkali corrosion resistance and the like of the metal pipe, and is widely applied to the fields of water supply, drainage, pollution discharge, chemical industry and the like. However, the metal-plastic composite pipe is affected by the tension of water and the change of the environmental temperature in the long-term water-passing environment, the metal layer and the plastic layer are often slowly peeled off, particularly, the end face of the composite pipe is easily exposed in the air, or the butt joint of two adjacent pipes is not sealed tightly, water and air enter the butt joint, so that the end face of the metal pipe is easily rusted, the metal layer and the plastic layer at the end part of the composite pipe are easily and slowly peeled off and layered, and the influence is gradually pushed towards the inside of the pipe body.
CN201910683558.7 discloses a metal plastic composite pipe end port reinforced end face sealing device and a manufacturing method thereof, which solves the problem of peeling and layering of a metal layer and a plastic layer which are caused by the contact of the end face of a metal plastic composite pipe and water under normal conditions to a certain extent, but the practical use proves that the metal reinforced ring and the plastic pipe are easy to slide under the action of hoisting or other external forces due to small frictional resistance of the contact face of the metal reinforced ring and the plastic pipe, which can cause sealing failure.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides a double-reinforced double-sealing device for the end face and the port of a metal-plastic composite pipe and a manufacturing method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a compound pipe terminal surface of metal plastics and two sealing device of reinforcing of port, is including the compound pipe body of metal plastics, metal reinforcing ring and the sealing ring that has terminal surface and port, the metal reinforcing ring includes metal reinforcing ring body and sets up the turn-ups in metal reinforcing ring body one end, the cross-sectional profile shape of metal reinforcing ring with the cross-sectional profile shape of sealing ring is the same, the sealing ring cover is in the outer wall of metal reinforcing ring is located between metal reinforcing ring and the compound pipe body of metal plastics.
Furthermore, the section of the flanging is a straight edge vertical to the section of the metal reinforced ring body, and the flanging and the straight edge form an L-like shape.
Furthermore, the height of the flanging at the outer end of the metal reinforcing ring is consistent with the wall thickness of the end face of the metal plastic composite pipe.
Furthermore, the width of the long side of the section of the sealing ring is not more than that of the metal reinforcing ring body, and the width of the short side of the section of the sealing ring is the same as the width of a flange at one end of the metal reinforcing ring.
Furthermore, the width of the metal reinforced ring body is more than or equal to 5mm, and the thickness of the metal reinforced ring body is more than or equal to 0.5 mm.
Further, the sealing ring is a rubber sealing ring.
Further, the metal reinforcing ring is a stainless steel reinforcing ring.
The invention relates to a method for manufacturing a double-reinforced double-sealing device for the end surface and the port of a metal plastic composite pipe, which comprises the following steps:
s1, manufacturing a metal reinforcing ring and a sealing ring;
s2, sleeving the sealing ring on a metal reinforcing ring, tightly attaching the sealing ring to the outer wall of the metal reinforcing ring, and sleeving the metal reinforcing ring in a port of the metal plastic composite pipe; or firstly, the sealing ring is sleeved in the port of the metal plastic composite pipe, the short edge of the sealing ring is tightly attached to the end face of the metal plastic composite pipe, and then the stainless steel reinforcing ring coated with the glue is sleeved on the sealing ring. (ii) a
And S3, finally, longitudinally extruding the metal reinforcing ring into the metal plastic composite pipe through the flanging at one end of the metal reinforcing ring which is propped against the extrusion equipment mould, and extruding the metal reinforcing ring inwards through the mould tool ring while extruding in the radial direction, so that the flanging of the metal reinforcing ring is tightly attached to the end surface of the metal plastic composite pipe, and the sealing ring is tightly wrapped between the metal reinforcing ring and the metal plastic composite pipe.
Further, the manufacturing method of the metal reinforced ring comprises the following steps:
1) cutting the length of the stainless steel band;
2) flanging and rolling;
3) welding;
4) and (6) polishing the welding seam.
Compared with the prior art, the invention has the beneficial effects that:
1. the technical scheme that the metal reinforcing ring and the sealing ring are adopted by the double-reinforcing double-sealing device for the end face and the port of the metal plastic composite pipe to carry out double sealing on the end face and the port of the metal plastic composite pipe greatly increases the friction resistance of the metal reinforcing ring and the metal plastic composite pipe, solves the technical problem that the metal reinforcing ring is easy to slip under the influence of external force, and avoids the problem of sealing failure caused by the slip of the metal reinforcing ring.
2. The end face and port double-reinforcement double-sealing device for the metal plastic composite pipe provided by the invention avoids the technical problem that the sealing effect is difficult to guarantee due to the movement of the sealing ring in the traditional sealing ring expansion ring extrusion process.
3. The end face and port double-reinforcing double-sealing device of the metal plastic composite pipe enables the lining and the metal reinforcing ring of the port of the metal plastic composite pipe to be in contact with the sealing ring, and solves the technical problems that the metal reinforcing ring and the sealing ring are loosened and fall off to cause poor sealing effect or sealing failure and the like in the processes of hoisting, transporting, storing and the like of the metal plastic composite pipe due to small friction resistance between the metal reinforcing ring and the lining.
4. The end face and port double-reinforcing double-sealing device for the metal plastic composite pipe effectively solves the technical problems that the metal reinforcing ring has poor reinforcing sealing effect or fails in reinforcing sealing on the metal plastic composite pipe and the like due to slippage of the metal reinforcing ring caused by insufficient contact because the metal reinforcing ring is not tightly expanded with the lining.
5. The end face and port double-enhancement double-sealing device for the metal plastic composite pipe realizes effective sealing of the sealing ring on the end face of the metal plastic composite pipe, and thoroughly solves the technical problem of metal pipe and lining layering caused by end face water seepage of the metal plastic composite pipe.
6. According to the end face and port double-reinforcing double-sealing device for the metal plastic composite pipe, the sealing ring is additionally arranged between the metal plastic composite pipe and the metal reinforcing ring, so that the contact between the lining of the metal plastic composite pipe and the metal reinforcing ring is changed into flexible contact, the metal reinforcing ring is expanded and connected more firmly by resilience force generated by the sealing ring after expansion, the friction resistance is higher, and the sealing effect is better.
7. The end face and port double-reinforcement double-sealing device for the metal plastic composite pipe solves the technical problem that a metal reinforcement ring is loosened and falls off due to elastic retraction of the metal reinforcement ring in the ring expanding process of the metal plastic composite pipe.
8. The manufacturing method of the metal plastic composite pipe end face and port double-reinforcement double-sealing device adopted by the invention has the advantages of simple process, simple required equipment and low production cost.
Drawings
FIG. 1 is a schematic structural view of example 1 of the present invention;
FIG. 2 is an enlarged view of the structure of embodiment 1A shown in FIG. 1;
FIG. 3 is a schematic structural view of a sealing ring sleeved on a metal reinforcing ring in embodiment 1 shown in FIG. 1;
FIG. 4 is a schematic structural view of example 2 of the present invention;
FIG. 5 is an enlarged view of the structure of FIG. 4 in the embodiment 2B.
In the figure: 1. 1-1 parts of metal reinforcing ring, 1-2 parts of metal reinforcing ring body, 1-2 parts of flanging, 2 parts of sealing ring, 3 parts of metal composite pipe body, 3-1 parts of port, 3-2 parts of end face.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Example 1
As shown in fig. 1-3, the metal plastic composite pipe of the present embodiment is a socket type composite pipe, and the present embodiment includes a metal plastic composite pipe body 3 with a port 3-1 and an end surface 3-2, a metal reinforcing ring 1 and a sealing ring 2, where the metal reinforcing ring 1 includes a metal reinforcing ring body 1-1 and a flange 1-2 disposed at one end of the metal reinforcing ring body 1-1, the cross-sectional profile shape of the metal reinforcing ring 1 is the same as that of the sealing ring 2, and the sealing ring 2 is sleeved on the outer wall of the metal reinforcing ring 1 and is located between the metal reinforcing ring 1 and the metal plastic composite pipe body 3.
In this embodiment, the cross section of the flange 1-2 is a straight edge perpendicular to the cross section of the metal reinforcing ring body 1-1, and the metal reinforcing ring 1 is bent once to form the flange, that is, the longitudinal section of the metal reinforcing ring 1 is shaped like an "L".
In the embodiment, the height of the flanging 1-2 at the outer end of the metal reinforcing ring 1 is consistent with the wall thickness of the end face 3-2 of the metal plastic composite pipe.
In this embodiment, the width of the metal reinforced ring body 1-1 is greater than or equal to 5mm, and the thickness of the metal reinforced ring body 1-1 is greater than or equal to 0.5 mm.
In this embodiment, the metal reinforcing ring 1 is a stainless steel reinforcing ring.
In this embodiment, the manufacturing method of the metal plastic composite pipe end surface and port double-reinforced double-sealing device specifically includes the following steps:
s1, manufacturing a metal reinforcing ring 1; measuring the inner diameter of the metal plastic composite pipe, calculating the perimeter of a stainless steel reinforcing ring which is 9mm smaller than the inner diameter of the metal plastic composite pipe, cutting a stainless steel band by taking the calculated perimeter as the length, wherein the width of the stainless steel band is 60mm, and the thickness of the stainless steel band is 1.4 mm; then, the cut stainless steel band is turned over and rolled by a turning-over and rolling machine; welding the rounded stainless steel ring by a welding machine, and polishing a welding seam;
s2, coating soft glue on the outer wall of the stainless steel reinforced ring, sleeving the sealing ring 2 on the stainless steel reinforced ring, after the glue is solidified, sleeving the sealing ring 2 on the outer wall of the stainless steel reinforced ring tightly, and finally sleeving the stainless steel reinforced ring sleeved with the sealing ring 2 in the port 3-1 of the metal plastic composite pipe, wherein the flanging 1-2 of the stainless steel reinforced ring is tightly adhered to the end face 3-2 of the metal plastic composite pipe; or firstly, the sealing ring 2 is sleeved in the port 3-1 of the metal plastic composite pipe, the short edge of the sealing ring 2 is tightly attached to the end surface 3-2 of the metal plastic composite pipe, and then the stainless steel reinforcing ring coated with the glue is sleeved on the sealing ring 2.
S3, finally, the stainless steel reinforced ring is longitudinally extruded into the metal plastic composite pipe by the extrusion equipment die against the flanging 1-2 at one end of the stainless steel reinforced ring, and the stainless steel reinforced ring is radially extruded and is internally extruded by the die tooling ring to expand the ring, so that the flanging 1-2 of the metal reinforced ring is tightly attached to the end surface 3-2 of the metal plastic composite pipe, and the sealing ring 2 is tightly wrapped between the stainless steel reinforced ring and the metal plastic composite pipe.
Example 2:
as shown in fig. 4 to 5, the metal plastic composite pipe in this embodiment is a straight pipe type composite pipe.
Various modifications and variations of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention provided they are within the scope of the claims of the present invention and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (10)
1. The utility model provides a compound pipe terminal surface of metal plastics and two sealing device of reinforcing of port, includes the compound pipe body of metal plastics, metal reinforcing ring and the sealing ring that has terminal surface and port, its characterized in that: the metal reinforcing ring comprises a metal reinforcing ring body and a flanging arranged at one end of the metal reinforcing ring body, the shape of the cross section profile of the metal reinforcing ring is the same as that of the cross section profile of the sealing ring, and the sealing ring is sleeved on the outer wall of the metal reinforcing ring and is positioned between the metal reinforcing ring and the metal plastic composite pipe body.
2. The metal-plastic composite pipe end face and port double-reinforcement double-sealing device according to claim 1, wherein: the section of the flanging is a straight edge vertical to the section of the metal reinforced ring body.
3. The metal-plastic composite pipe end face and port double-reinforced double-sealing device according to claim 1 or 2, wherein: the height of the flanging at the outer end of the metal reinforcing ring is consistent with the wall thickness of the end face of the metal plastic composite pipe.
4. The metal-plastic composite pipe end face and port double-reinforced double-sealing device according to claim 1 or 2, wherein: the width of the long side of the section of the sealing ring is not more than that of the metal reinforcing ring body, and the width of the short side of the section of the sealing ring is the same as the width of a flange at one end of the metal reinforcing ring.
5. The metal-plastic composite pipe end face and port double-reinforcement double-sealing device according to claim 3, wherein: the width of the long side of the section of the sealing ring is not more than that of the metal reinforcing ring body, and the width of the short side of the section of the sealing ring is the same as that of the flanging at one end of the metal reinforcing ring.
6. The metal-plastic composite pipe end face and port double-reinforcement double-sealing device according to claim 4, wherein: the width of the metal reinforced ring body is more than or equal to 5mm, and the thickness of the metal reinforced ring body is more than or equal to 0.5 mm.
7. The metal-plastic composite pipe end face and port double reinforcement double sealing device according to one of claims 1 to 6, wherein: the sealing ring is a rubber sealing ring.
8. The metal-plastic composite pipe end face and port double reinforcement double sealing device according to one of claims 1 to 6, wherein: the metal reinforcing ring is a stainless steel reinforcing ring.
9. A method for manufacturing a metal plastic composite pipe end face and port double reinforced double sealing device according to any one of claims 1 to 8, wherein: the method specifically comprises the following steps:
s1, manufacturing a metal reinforcing ring;
s2, sleeving the sealing ring on a stainless steel reinforcing ring, tightly attaching the sealing ring to the outer wall of the stainless steel reinforcing ring, and sleeving the stainless steel reinforcing ring in the port of the metal plastic composite pipe; or the sealing ring is sleeved in the port of the metal plastic composite pipe, the short edge of the sealing ring is tightly attached to the end face of the metal plastic composite pipe, and then the stainless steel reinforcing ring coated with the glue is sleeved on the sealing ring;
and S3, finally, longitudinally extruding the metal reinforcing ring into the metal plastic composite pipe through the flanging at one end of the metal reinforcing ring which is propped against the extrusion equipment mould, and extruding the metal reinforcing ring inwards through the mould tool ring while extruding in the radial direction, so that the flanging of the metal reinforcing ring is tightly attached to the end surface of the metal plastic composite pipe, and the sealing ring is tightly wrapped between the metal reinforcing ring and the metal plastic composite pipe.
10. The method for manufacturing the metal plastic composite pipe end face and port double-reinforcing double-sealing device according to claim 9, wherein the method comprises the following steps: the manufacturing method of the metal reinforcing ring comprises the following steps:
1) cutting the length of the stainless steel band;
2) flanging and rolling;
3) welding;
4) and (6) polishing the welding seam.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010249425.1A CN111237552A (en) | 2020-04-01 | 2020-04-01 | End face and port double-enhancement double-sealing device of metal plastic composite pipe and manufacturing method thereof |
| PCT/CN2021/084850 WO2021197405A1 (en) | 2020-04-01 | 2021-04-01 | End surface and port dual-reinforcing dual-sealing device for metal-plastic composite pipe and fabrication method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010249425.1A CN111237552A (en) | 2020-04-01 | 2020-04-01 | End face and port double-enhancement double-sealing device of metal plastic composite pipe and manufacturing method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111237552A true CN111237552A (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010249425.1A Pending CN111237552A (en) | 2020-04-01 | 2020-04-01 | End face and port double-enhancement double-sealing device of metal plastic composite pipe and manufacturing method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111237552A (en) |
| WO (1) | WO2021197405A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021197405A1 (en) * | 2020-04-01 | 2021-10-07 | 湖南振辉管业有限公司 | End surface and port dual-reinforcing dual-sealing device for metal-plastic composite pipe and fabrication method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115415693B (en) * | 2022-08-26 | 2024-01-23 | 吴欢 | Construction method of flexible lining for sealing interior of pressure-bearing device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005015343B4 (en) * | 2005-04-01 | 2009-09-03 | Woco Industrietechnik Gmbh | Coupling sleeve for a quick coupling, its use as part of a quick coupling, this quick coupling and a method for producing a coupling sleeve |
| JP5523612B1 (en) * | 2013-05-08 | 2014-06-18 | 井上スダレ株式会社 | Pipe joint structure |
| CN110285271A (en) * | 2019-07-26 | 2019-09-27 | 湖南振辉管业有限公司 | A kind of composite metal-plastic pipe port enhancing face seals and preparation method thereof |
| CN110274099A (en) * | 2019-07-26 | 2019-09-24 | 湖南振辉管业有限公司 | End is equipped with the composite metal-plastic pipe and its manufacturing method of enhancing sealing mechanism |
| CN111237552A (en) * | 2020-04-01 | 2020-06-05 | 湖南振辉管业有限公司 | End face and port double-enhancement double-sealing device of metal plastic composite pipe and manufacturing method thereof |
| CN212080379U (en) * | 2020-04-01 | 2020-12-04 | 湖南振辉管业有限公司 | End face and port double-enhanced double-sealing device of metal plastic composite pipe |
-
2020
- 2020-04-01 CN CN202010249425.1A patent/CN111237552A/en active Pending
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2021
- 2021-04-01 WO PCT/CN2021/084850 patent/WO2021197405A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021197405A1 (en) * | 2020-04-01 | 2021-10-07 | 湖南振辉管业有限公司 | End surface and port dual-reinforcing dual-sealing device for metal-plastic composite pipe and fabrication method |
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| Publication number | Publication date |
|---|---|
| WO2021197405A1 (en) | 2021-10-07 |
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