CN220581890U - Plastic-coated anticorrosion nodular cast iron pipe containing carbon steel lining - Google Patents
Plastic-coated anticorrosion nodular cast iron pipe containing carbon steel lining Download PDFInfo
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- CN220581890U CN220581890U CN202322236254.0U CN202322236254U CN220581890U CN 220581890 U CN220581890 U CN 220581890U CN 202322236254 U CN202322236254 U CN 202322236254U CN 220581890 U CN220581890 U CN 220581890U
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- layer
- wall
- cast iron
- carbon steel
- plastic
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- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 53
- 239000004033 plastic Substances 0.000 title claims abstract description 49
- 229920003023 plastic Polymers 0.000 title claims abstract description 49
- 229910000975 Carbon steel Inorganic materials 0.000 title claims abstract description 37
- 239000010962 carbon steel Substances 0.000 title claims abstract description 37
- 238000005260 corrosion Methods 0.000 claims abstract description 38
- 238000005507 spraying Methods 0.000 claims abstract description 27
- 239000002131 composite material Substances 0.000 claims abstract description 4
- -1 polyethylene Polymers 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 9
- 239000004698 Polyethylene Substances 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000002788 crimping Methods 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 2
- 231100000252 nontoxic Toxicity 0.000 claims description 2
- 230000003000 nontoxic effect Effects 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 claims 5
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 49
- 238000005536 corrosion prevention Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model relates to the technical field of spheroidal graphite cast iron pipelines and discloses a plastic-coated anti-corrosion spheroidal graphite cast iron pipe with a carbon steel lining, which comprises a spheroidal graphite cast iron layer and an inner anti-corrosion layer, wherein the inner anti-corrosion layer is attached to the inner wall of the spheroidal graphite cast iron layer after being pressurized and extended from the inside, and the surface shape of the outer wall of the inner anti-corrosion layer is matched with the surface shape of the uneven inner wall of the spheroidal graphite cast iron layer in a concave-convex manner after being attached; the inner anti-corrosion layer is adhered to the inner wall of the spheroidal graphite cast iron layer; the inner anti-corrosion layer is of a composite structure and comprises a thin-wall carbon steel layer and a plastic spray coating, and the plastic spray coating is naturally attached to the inner wall of the thin-wall carbon steel layer. According to the utility model, the thin-wall carbon steel layer is arranged between the ductile cast iron pipe and the plastic spraying layer, so that the problem that the plastic spraying layer cannot be directly attached to the inner wall of the ductile cast iron pipe is solved, and on the other hand, the uneven structure of the inner wall of the ductile cast iron pipe can be bridged through the ductility of the carbon steel material, so that the combination of all layers of the pipeline is tighter.
Description
Technical Field
The utility model relates to the technical field of spheroidal graphite cast iron pipelines, in particular to a plastic-coated anti-corrosion spheroidal graphite cast iron pipe with a carbon steel lining.
Background
The ductile cast iron pipe is a common water supply and drainage pipeline, and in production practice, the inner wall of the ductile cast iron pipe needs to be preserved.
The lining plastic is a common anti-corrosion mode of the ductile cast iron pipe, and the principle is that plastic materials are made into a pipe shape and inserted into the ductile cast iron pipe to form an anti-corrosion protection layer, so that the ductile cast iron pipe is protected from being corroded by a medium. However, due to the limitation of the strength of the plastic material, for large-diameter pipelines, the plastic lining mode needs thicker wall thickness of the plastic pipe to ensure that the plastic pipe cannot collapse, but increasing the wall thickness of the plastic pipe not only greatly increases the whole weight of the pipeline and is not beneficial to transportation and installation, but also greatly increases the raw material cost of the pipeline.
In order to improve the existing lining plastic corrosion prevention process, the technicians envisage directly spraying polyethylene plastic to the inner wall of the ductile cast iron pipe, but in practice, it is found that the plastic spraying corrosion prevention process is not universally applicable because: due to the limitation of the current processing technology, the inner wall of many spheroidal graphite cast iron pipes, especially the spheroidal graphite cast iron pipe with ultra-large diameter, is very uneven, and the sprayed plastic layer can not completely cover the inner wall of the spheroidal graphite cast iron pipe.
Therefore, a brand new lining plastic corrosion prevention structure is needed to be designed aiming at the problem that the inner wall of the ductile cast iron pipe is too rough to be subjected to plastic spraying corrosion prevention.
Disclosure of Invention
The utility model aims to provide a plastic-coated anti-corrosion nodular cast iron pipe with a carbon steel lining, and the plastic-coated anti-corrosion technology is applicable to all nodular cast iron pipes by designing a brand-new lining plastic anti-corrosion structure.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the plastic-coated anti-corrosion spheroidal graphite cast iron pipe comprises a spheroidal graphite cast iron layer and an inner anti-corrosion layer, wherein the inner anti-corrosion layer is attached to the inner wall of the spheroidal graphite cast iron layer after being pressurized and extended from the inside, and the surface shape of the outer wall of the inner anti-corrosion layer is matched with the surface shape of the uneven inner wall of the spheroidal graphite cast iron layer in a concave-convex manner after being attached;
the inner anti-corrosion layer is adhered to the inner wall of the spheroidal graphite cast iron layer;
the inner anti-corrosion layer is of a composite structure and comprises a thin-wall carbon steel layer and a plastic spray coating, and the plastic spray coating is naturally attached to the inner wall of the thin-wall carbon steel layer.
Preferably, the thickness of the thin-walled carbon steel layer is 0.5-2 mm.
Preferably, the thin-wall carbon steel layer is formed by spirally crimping and welding a steel strip, and a spiral weld is formed after welding.
Preferably, the glue used for bonding the inner anti-corrosion layer and the spheroidal graphite cast iron layer is non-toxic modified polyethylene.
Preferably, the plastic spraying layer is made of polyethylene.
Preferably, the plastic spraying layer is made of polypropylene.
The beneficial effects of the utility model are as follows:
in order to successfully set a plastic spray coating on the inner side of the spheroidal graphite cast iron pipe to realize corrosion prevention, a thin-wall carbon steel layer is arranged between the spheroidal graphite cast iron pipe and the plastic spray coating, and the thin-wall carbon steel layer solves the problem that the plastic spray coating cannot be directly adhered to the inner wall of the spheroidal graphite cast iron pipe, and on the other hand, the uneven structure of the inner wall of the spheroidal graphite cast iron pipe can be bridged through the ductility of a carbon steel material, so that the combination of all layers of a pipeline is tighter.
Drawings
Fig. 1 is a schematic view of the semi-sectional structure of the present utility model.
FIG. 2 is a schematic view of the external structure of a thin-walled carbon steel layer.
In the figure: 1. a spheroidal graphite cast iron layer; 2. a thin-walled carbon steel layer; 3. a plastic spray coating; 4. and (5) spiral welding seams.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, the embodiment includes a ductile cast iron layer 1 and an inner anti-corrosion layer, which are common structures in the prior art, and are not described herein.
As shown in fig. 1, the innovation of the embodiment is that the inner anti-corrosion layer is adhered to the inner wall of the spheroidal graphite cast iron layer 1 after being stretched by water pressure from the inside, and the surface shape of the outer wall of the inner anti-corrosion layer is matched with the surface shape of the uneven inner wall of the spheroidal graphite cast iron layer 1 in a concave-convex manner after being adhered; the uneven structure of the inner wall of the ductile cast iron pipe is bridged by the ductility of the inner anti-corrosion layer, so that the combination of all layers of the pipe is tighter.
In order to improve the adhesive force of the inner anti-corrosion layer on the inner wall of the spheroidal graphite cast iron layer 1, the inner anti-corrosion layer is adhered on the inner wall of the spheroidal graphite cast iron layer 1, and specific adhesive materials can be modified polyethylene (the prior art), so that the adhesive has the characteristic of no toxicity, and can meet the requirements of pipeline materials in the process of conveying drinking water of residents.
As shown in fig. 1, the inner anti-corrosion layer is of a composite structure and comprises a thin-wall carbon steel layer 2 and a plastic spray coating layer 3, wherein the plastic spray coating layer 3 is naturally attached to the inner wall of the thin-wall carbon steel layer 2. The plastic spray coating 3 is sprayed on the thin-wall carbon steel layer 2 in advance, and then high-pressure water is injected into the inner anti-corrosion layer to enable the inner anti-corrosion layer to be integrally extended and expanded, so that the adhesion surface of the plastic spray coating 3 is smooth during spraying, and the spraying uniformity is ensured. In implementation, the plastic spray coating 3 is made of polyethylene.
Preferably, the plastic spray coating 3 is made of polypropylene.
The wall thickness of the thin-wall carbon steel layer 2 is not required to be too thick, and the thickness is controlled to be 0.5-2 mm according to the diameter of a pipeline and the use requirement, for example, a pipeline with the diameter of one meter, and the wall thickness of the thin-wall carbon steel layer 2 can be selected to be 0.5 mm, 0.8 mm, 1 mm and the like.
In this embodiment, as shown in fig. 2, the thin-walled carbon steel layer 2 is formed by spirally crimping steel strips, and a spiral weld 4 is formed after the welding. The manufacturing cost of the thin-wall carbon steel layer 2, especially the large-diameter thin-wall carbon steel layer 2 is greatly reduced by a spiral welding mode, and meanwhile, the structural strength of the thin-wall carbon steel layer 2 can be effectively increased by the spiral welding seam 4 formed after the spiral welding.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a plastic-coated anticorrosive nodular cast iron pipe that contains carbon steel inside lining, includes nodular cast iron layer (1) and interior anticorrosive coating, its characterized in that: the inner anti-corrosion layer is attached to the inner wall of the spheroidal graphite cast iron layer (1) after being pressed and extended from the inside, and the surface shape of the outer wall of the inner anti-corrosion layer is matched with the surface shape of the uneven inner wall of the spheroidal graphite cast iron layer (1) in a concave-convex manner after being attached;
the inner anti-corrosion layer is adhered to the inner wall of the nodular cast iron layer (1);
the inner anti-corrosion layer is of a composite structure and comprises a thin-wall carbon steel layer (2) and a plastic spraying layer (3), wherein the plastic spraying layer (3) is naturally attached to the inner wall of the thin-wall carbon steel layer (2).
2. A plastic coated corrosion resistant ductile iron pipe comprising a carbon steel lining according to claim 1 wherein: the thickness of the thin-wall carbon steel layer (2) is 0.5-2 mm.
3. A plastic coated corrosion resistant ductile iron pipe comprising a carbon steel lining according to claim 1 wherein: the thin-wall carbon steel layer (2) is formed by spirally crimping and welding a steel strip, and a spiral weld joint (4) is formed after welding.
4. A plastic coated corrosion resistant ductile iron pipe comprising a carbon steel lining according to claim 1 wherein: the glue used for bonding the inner anti-corrosion layer and the nodular cast iron layer (1) is nontoxic modified polyethylene.
5. A plastic coated corrosion resistant ductile iron pipe comprising a carbon steel lining according to claim 1 wherein: the plastic spraying layer (3) is made of polyethylene.
6. A plastic coated corrosion resistant ductile iron pipe comprising a carbon steel lining according to claim 1 wherein: the plastic spraying layer (3) is made of polypropylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322236254.0U CN220581890U (en) | 2023-08-21 | 2023-08-21 | Plastic-coated anticorrosion nodular cast iron pipe containing carbon steel lining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322236254.0U CN220581890U (en) | 2023-08-21 | 2023-08-21 | Plastic-coated anticorrosion nodular cast iron pipe containing carbon steel lining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220581890U true CN220581890U (en) | 2024-03-12 |
Family
ID=90107925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322236254.0U Active CN220581890U (en) | 2023-08-21 | 2023-08-21 | Plastic-coated anticorrosion nodular cast iron pipe containing carbon steel lining |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220581890U (en) |
-
2023
- 2023-08-21 CN CN202322236254.0U patent/CN220581890U/en active Active
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