Nanometer weather-proof anticorrosive coating composite steel pipe and conveying system

Abstract

The utility model relates to the technical field of structural design of composite steel pipes, in particular to a composite steel pipe with a nanometer weather-proof anti-corrosion coating and a conveying system, which comprises a lining layer, and a steel structure pipeline main body and an outer wrapping layer are sequentially arranged outside the lining layer; a plurality of spiral structure protrusions are arranged on the outer portion of the steel structure pipeline body in the circumferential direction, the spiral structure protrusions extend into the outer wrapping layer, and a fluctuating curve mechanism on the outer side of a spiral structure generates firm grabbing force on the outer wrapping layer. Meanwhile, the outer wrapping layer can be squeezed into cavities formed among the protrusions of the spiral structure, the firmness of the grabbing force is further improved, and therefore the connecting strength of the outer wrapping layer and the steel structure pipeline body is further improved, the service life of the composite steel pipe is prolonged, and the composite steel pipe can better meet the use requirements under the severe conditions of an underground coal mine. The problems that in the prior art, the connection strength between a steel structure layer and an external coating in a composite steel pipe structure is low, and failure is prone to occurring in the using process are solved.

Description

Technical Field

[0001] This utility model relates to the field of composite steel pipe structure design technology, specifically to a nano-weather-resistant and corrosion-resistant composite steel pipe and its conveying system. Background Technology

[0002] Coal mines primarily use metal pipes for water supply and drainage, positive pressure ventilation, and shotcrete. Due to their use in underground operations with significant variations in water pressure, air pressure, and temperature, these pipes suffer from severe corrosion and rust, requiring substantial manual labor for maintenance and replacement. Compared to metal pipes, plastic pipes offer advantages such as better resistance to chemical corrosion, superior electrical insulation, ease of installation, and lower cost. However, in underground coal mines, plastic pipes lag significantly behind steel pipes in terms of pressure resistance, heat resistance, rigidity, and strength, resulting in lower safety. Composite steel pipes, used for transporting media, consist mainly of a steel structure pipe body and inner and outer coatings. These coatings effectively isolate the steel pipe from the external environment, preventing corrosion from moisture, acids, and alkalis. They also absorb some external forces, reducing wear and impact damage to the pipe surface, protecting its structural integrity and stability, and extending its service life. Therefore, composite steel pipes, with their advantages of good corrosion resistance, good insulation, high compressive strength, and low cost, are increasingly being used in underground water supply and drainage systems and ventilation systems during coal production.

[0003] Authorized publication number CN212935414U discloses a corrosion-resistant composite steel pipe structure, comprising a stainless steel inner tube, a polytetrafluoroethylene (PTFE) outer tube, and a stainless steel limiting tube. The stainless steel inner tube has a first inner hole and internal threads; the PTFE outer tube has a second inner hole, a first convex ring, several protrusions, a through hole, and a second convex ring, and is fitted onto the stainless steel inner tube. The stainless steel limiting tube has a third inner hole, external threads, a third convex ring, and several nesting holes. The external threads are screwed onto the internal threads, and each nesting hole is fitted onto a corresponding protrusion. The third convex ring is located inside the second convex ring. The outer layer of this invention is a PTFE outer tube, which provides excellent insulation, thus improving safety. Furthermore, the PTFE outer tube is removable, which helps reduce maintenance costs. This corrosion-resistant composite steel pipe structure has the advantages of high reliability and good corrosion resistance. However, due to the harsh conditions in coal mines, the adhesion between the polytetrafluoroethylene outer tube and the stainless steel inner tube in the above-mentioned corrosion-resistant composite steel pipe structure is not as strong as that of epoxy resin. Therefore, the connection strength between the polytetrafluoroethylene outer tube and the stainless steel inner tube is low, and they are prone to separation during long-term use. This causes the polytetrafluoroethylene outer tube to lose its function and reduces the service life of the composite steel pipe. Utility Model Content

[0004] To address the problem of low connection strength between the steel structure layer and the outer coating in existing composite steel pipe structures, which leads to easy failure during use, this utility model provides a nano-weather-resistant and corrosion-resistant coated composite steel pipe and its conveying system.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a nano-weather-resistant and corrosion-resistant coating composite steel pipe, including an inner lining layer, and a steel structure pipe body and an outer wrapping layer are sequentially arranged outside the inner lining layer.

[0007] The steel pipe body has several spiral protrusions arranged circumferentially on its exterior, and these spiral protrusions extend into the interior of the outer wrapping layer.

[0008] Optionally, the spiral structure protrusion extends to 2 / 3 of the interior of the outer wrapping layer.

[0009] Optionally, the outer wrapping layer is a polyvinyl chloride outer wrapping layer.

[0010] Optionally, the inner liner is an epoxy resin inner liner.

[0011] Optionally, the cross-section of the spiral structure protrusion is circular, annular, rectangular, or triangular.

[0012] Optionally, the thickness of the outer wrapping layer is 0.6 to 1 mm.

[0013] Optionally, the thickness of the inner lining layer is 0.3 to 0.6 mm.

[0014] Optionally, the outer wrapping layer is provided with a nano-weather-resistant and corrosion-resistant coating.

[0015] Optionally, the nano-weather-resistant and corrosion-resistant coating is an alumina-based weather-resistant and corrosion-resistant coating.

[0016] This utility model also provides a coal mine gas and water transportation system, including the above-mentioned nano-weather-resistant and corrosion-resistant coating composite steel pipe.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This utility model discloses a nano-weather-resistant and corrosion-resistant composite steel pipe, comprising an inner lining layer, a steel structure pipe body, and an outer wrapping layer arranged sequentially outside the inner lining layer. By circumferentially arranging a plurality of spiral protrusions on the outer side of the steel structure pipe body, extending into the interior of the outer wrapping layer, the undulating curve mechanism on the outer side of the spiral structure generates a strong grip on the outer wrapping layer, preventing detachment during use due to weak adhesion between the outer wrapping layer and the steel structure pipe body. Simultaneously, during the production of the composite steel pipe, during the extrusion molding of the outer wrapping layer, the outer wrapping layer is squeezed into the cavity formed between the spiral protrusions, further enhancing the reliability of the grip, thereby further improving the connection strength between the outer wrapping layer and the steel structure pipe body, extending the service life of the composite steel pipe, and making it better suited to the harsh conditions of underground coal mines. The structure is simple, the modification cost is low, and it is easy to process.

[0019] The spiral structure protrusion extends to 2 / 3 of the inner part of the outer wrapping layer, greatly increasing the contact area between the protrusion and the outer wrapping layer. This allows the outer wrapping layer to more effectively grasp the spiral structure protrusion when subjected to external forces, thereby enhancing the connection strength between the two.

[0020] The outer coating is made of polyvinyl chloride (PVC), which not only withstands certain mechanical impacts and wear, but also possesses excellent weather resistance, enabling it to resist long-term erosion from natural factors such as sunlight, rain, and snow. In harsh environments such as underground coal mines, the PVC outer coating effectively protects the main body of the steel structure pipeline from damage caused by moisture and corrosion, extending the service life of the composite steel pipe.

[0021] The inner lining is an epoxy resin lining. Epoxy resin has excellent impermeability and can effectively prevent moisture and gas penetration, thereby reducing the risk of leakage caused by corrosion inside the steel structure pipe body. It also has strong adhesion and can be tightly bonded to the steel structure pipe body.

[0022] The spiral structure protrusion has a circular cross-section. The circular cross-section has uniformity and continuity, which can ensure that the spiral structure protrusion is more evenly distributed in the circumferential direction of the steel pipe and can more evenly disperse stress when under force, reducing stress concentration and thus improving the overall strength of the steel pipe.

[0023] The outer coating is covered with a nano-weather-resistant and corrosion-resistant coating. This coating, with its tiny nano-sized particles and unique physicochemical properties, forms a dense protective layer that effectively isolates the steel pipe from external corrosive environments. This coating can resist the erosion of various corrosive substances such as moisture, oxygen, and acidic gases, thereby greatly extending the service life of the composite steel pipe.

[0024] The aforementioned nano-weather-resistant and anti-corrosion coating is an alumina-based coating. Due to its high hardness and chemical stability, the alumina-based coating forms a robust protective film, effectively isolating the steel pipe from external corrosive environments. This coating can resist the erosion of various corrosive substances such as moisture, oxygen, and acidic gases, thus significantly extending the service life of the composite steel pipe. Especially in harsh environments such as underground coal mines, the alumina coating maintains its stability and protective performance, ensuring the long-term stable operation of the steel pipe. It possesses excellent weather resistance, capable of withstanding long-term erosion from natural factors such as sunlight, rain, and temperature changes.

[0025] This utility model also provides a coal mine gas and water conveying system, including the above-mentioned nano-weather-resistant and anti-corrosion coated composite steel pipe. This conveying system has the characteristics of strong weather resistance, long service life and low maintenance cost, making the conveying system more reliable, efficient and environmentally friendly in coal mine production. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of a nano-weather-resistant and corrosion-resistant composite steel pipe according to the present invention.

[0027] Figure 2 This is a partial enlarged view of a nano-weather-resistant and corrosion-resistant composite steel pipe according to the present invention.

[0028] Among them, 1-inner lining, 2-steel structure pipe body, 3-outer wrapping layer, 4-spiral structure protrusion, 5-nano weather-resistant and anti-corrosion coating. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] The present invention will be further described in detail below with reference to specific embodiments. The description is for explanation and not limitation of the present invention.

[0036] Reference Figure 1 This utility model provides a nano-weather-resistant and corrosion-resistant coating composite steel pipe, including an inner lining layer 1, a steel structure pipe body 2, and an outer wrapping layer 3;

[0037] The inner lining layer 1 is an epoxy resin inner lining layer. Epoxy resin has excellent impermeability and can effectively prevent moisture and gas penetration, thereby reducing the risk of leakage caused by corrosion inside the steel structure pipe body. It also has strong adhesion and can be tightly bonded to the steel structure pipe body. Preferably, the thickness of the inner lining layer 1 is 0.3 to 0.6 mm.

[0038] See Figure 2The main body 2 of the steel structure pipe is disposed outside the inner lining layer 1. A plurality of spiral protrusions 4 are circumferentially arranged on the outside of the main body 2, extending to two-thirds of the inner portion of the outer wrapping layer 3. Compared to other irregular structures, this design is easier to process in daily production, and the undulating curves on both sides of the spiral structure and the cavities of adjacent spiral irregular structures provide stronger grip on the outer wrapping layer. The cross-sectional structure of the spiral protrusions 4 can be polygonal, such as rectangular or triangular, or annular, such as rectangular, circular, or quadrilateral rings; or any structure known to those skilled in the art to increase the contact area. A circular structure is preferred, as the circular cross-section has uniformity and continuity, ensuring a more balanced distribution of the spiral protrusions circumferentially on the steel pipe, and more evenly dispersing stress under load, reducing stress concentration and thus improving the overall strength of the steel pipe. Preferably, the outer wrapping layer 3 is a polyvinyl chloride (PVC) outer wrapping layer. Polyvinyl chloride is more wear-resistant and corrosion-resistant, has a longer service life, and can more effectively adapt to harsh external environments. Moreover, the raw materials are widely available and low in cost. The thickness of the outer wrapping layer 3 is 0.6 to 1 mm.

[0039] The nano-weather-resistant and anti-corrosion coating 5 is applied to the outside of the outer wrapping layer 3. The application of the nano-weather-resistant and anti-corrosion coating 5 greatly improves the corrosion resistance of the steel structure pipeline, further extending its service life. Preferably, the nano-weather-resistant and anti-corrosion coating 4 is an alumina-based weather-resistant and anti-corrosion coating, which offers even better weather resistance and corrosion resistance.

[0040] This utility model also provides a coal mine gas and water conveying system, including the above-mentioned nano-weather-resistant and anti-corrosion coated composite steel pipe. This conveying system has the characteristics of strong weather resistance, long service life and low maintenance cost, making the conveying system more reliable, efficient and environmentally friendly in coal mine production.

[0041] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the technical solution of the present utility model in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present utility model, the technical solution can be modified and replaced in several simple ways, and these modifications and replacements are all within the scope of protection covered by the claims.

Claims

1. A nano-weather-resistant and corrosion-resistant composite steel pipe, characterized in that, It includes an inner lining layer (1), and a steel structure pipe body (2) and an outer wrapping layer (3) are sequentially arranged outside the inner lining layer. The steel structure pipe body (2) has several spiral structure protrusions (4) arranged circumferentially on the outside, and the spiral structure protrusions (4) extend into the interior of the outer wrapping layer (3).

2. The nano-weather-resistant and corrosion-resistant composite steel pipe according to claim 1, characterized in that, The spiral structure protrusion (4) extends to 2 / 3 of the interior of the outer wrapping layer (3).

3. The nano-weather-resistant and corrosion-resistant composite steel pipe according to claim 1, characterized in that, The outer wrapping layer (3) is a polyvinyl chloride outer wrapping layer.

4. The nano-weather-resistant and corrosion-resistant composite steel pipe according to claim 1, characterized in that, The inner lining (1) is an epoxy resin inner lining.

5. The nano-weather-resistant and corrosion-resistant composite steel pipe according to claim 1, characterized in that, The cross-section of the spiral structure protrusion (4) is circular, annular, rectangular or triangular.

6. The nano-weather-resistant and corrosion-resistant composite steel pipe according to claim 1, characterized in that, The thickness of the outer wrapping layer (3) is 0.6 to 1 mm.

7. The nano-weather-resistant and corrosion-resistant composite steel pipe according to claim 1, characterized in that, The thickness of the inner lining layer (1) is 0.3 to 0.6 mm.

8. The nano-weather-resistant and corrosion-resistant composite steel pipe according to claim 1, characterized in that, The outer wrapping layer (3) is provided with a nano-weather-resistant and corrosion-resistant coating (5).

9. The nano-weather-resistant and corrosion-resistant composite steel pipe according to claim 8, characterized in that, The nano-weather-resistant and corrosion-resistant coating (5) is an alumina-based weather-resistant and corrosion-resistant coating.

10. A gas and water conveying system for coal mines, characterized in that, The composite steel pipe with nano-weather-resistant and corrosion-resistant coating as described in any one of claims 1-9.

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