Plastic-steel composite reinforced plastic-coated steel pipe

Abstract

The utility model discloses a plastic-steel composite reinforced plastic-coated steel pipe which comprises a plastic-coated steel pipe base body, an inner anti-corrosion coating is fixedly arranged on the inner surface of the plastic-coated steel pipe base body, an outer bonding layer is fixedly arranged on the outer surface of the plastic-coated steel pipe base body, and a plastic-steel reinforcing layer is fixedly arranged outside the outer bonding layer. The outer protective coating is fixedly arranged outside the plastic steel reinforcing layer, metal wires are embedded in the plastic steel reinforcing layer, and a plurality of protruding edges are distributed on the outer surface of the plastic steel reinforcing layer at equal intervals. The plastic steel reinforcing layer is made of polyvinyl chloride glass fiber composite materials, metal wires are embedded in the plastic steel reinforcing layer, and the overall strength and rigidity of the pipeline are greatly improved. By means of the composite structure, when the pipeline bears high-pressure fluid conveying or large external pressure, deformation and fracture can be effectively resisted, and it is ensured that the pressure bearing capacity of the pipeline meets the requirements of various high-pressure systems.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic-coated steel pipe devices, in particular to a plastic-steel composite reinforced plastic-coated steel pipe. Background Art

[0002] Plastic-coated steel pipe, as an important pipe material, has been widely used in numerous fields. By applying a plastic coating to the surface of a steel pipe base, it aims to combine the mechanical strength of the steel pipe with the corrosion resistance of the plastic coating to meet the fluid transportation needs of various complex working conditions. It plays a key role in pipeline systems in industries such as petrochemicals, urban water supply, and building water supply and drainage. However, traditional plastic-coated steel pipe has gradually exposed some defects over long-term use, particularly in terms of external protection and strength performance.

[0003] In terms of external protection, the coating materials used are relatively simple, with limited resistance to weathering, abrasion, and chemical attack. For example, long-term exposure to environmental factors such as ultraviolet radiation, wind and rain erosion, corrosive gases or media, and temperature fluctuations can cause the coating to age, fade, crack, and even peel, seriously affecting the service life and overall stability of the pipeline.

[0004] In terms of strength performance, traditional plastic-coated steel pipes lack effective reinforcement structures. When subjected to external forces such as ground subsidence, earthquakes, and mechanical impacts, the steel pipes are prone to deformation, dents, or even rupture. They cannot meet engineering application scenarios that require high pipeline strength and stability, such as fire water supply systems in high-rise buildings and deep underground oil and gas pipelines. Utility Model Content

[0005] (1) Technical issues

[0006] The utility model aims to overcome the inherent defects of traditional plastic-coated steel pipes in terms of external protection and strength, and to provide a plastic-steel composite reinforced plastic-coated steel pipe with better overall performance.

[0007] (2) Technical content

[0008] In order to solve the above technical problems, the technical solution of the utility model is: a plastic-steel composite reinforced plastic-coated steel pipe, including a plastic-coated steel pipe substrate, the inner surface of the plastic-coated steel pipe substrate is fixedly provided with an inner anti-corrosion coating, the outer surface of the plastic-coated steel pipe substrate is fixedly provided with an outer bonding layer, the outside of the outer bonding layer is fixedly provided with a plastic-steel reinforcement layer, the outside of the plastic-steel reinforcement layer is fixedly provided with an outer protective coating, the inside of the plastic-steel reinforcement layer is embedded with metal wire, and the outer surface of the plastic-steel reinforcement layer is evenly distributed with a number of ridges, the ridges are made of the same material as the plastic-steel reinforcement layer and are integrally formed.

[0009] Furthermore, the inner anti-corrosion coating is made of epoxy resin material to prevent the inside of the plastic-coated steel pipe substrate from being corroded by corrosive media. The thickness of the inner anti-corrosion coating is 0.2-0.5 mm.

[0010] Furthermore, the outer bonding layer is made of polymer bonding material and has a thickness of 0.1-0.3 mm.

[0011] Furthermore, the plastic-steel reinforcement layer is made of polyvinyl chloride glass fiber composite material, and the thickness of the plastic-steel reinforcement layer is 2-5 mm.

[0012] Furthermore, the outer protective coating is made of polyurethane and has a thickness of 0.3-0.8 mm.

[0013] (3) Technical effects

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. The outer protective coating is made of polyurethane, which has excellent weather resistance, wear resistance and chemical corrosion resistance. It can effectively resist the invasion of external factors such as ultraviolet rays, wind and rain, corrosive gases, high humidity, high salinity environment, etc., and significantly delay the occurrence of coating aging, fading, cracking and peeling.

[0016] 2. The plastic-steel reinforcement layer utilizes a PVC / glass fiber composite material with embedded metal wire, significantly enhancing the overall strength and rigidity of the pipe. This composite structure effectively resists deformation and rupture when subjected to high-pressure fluid transport or significant external pressure, ensuring the pipe's pressure-bearing capacity meets the requirements of various high-pressure systems.

[0017] 3. The equidistantly distributed ridges on the outer surface of the plastic-steel reinforcement layer not only increase the surface area of ​​the pipeline and improve the contact stability between the outer protective coating and the external environment, but also enhance the bending and torsional resistance of the pipeline to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of a plastic-steel composite reinforced plastic-coated steel pipe of the present invention.

[0019] Figure 2 This is a schematic diagram of the main structure of a plastic-steel composite reinforced plastic-coated steel pipe of the present invention.

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of a plastic-steel composite reinforced plastic-coated steel pipe of the present invention.

[0021] Figure 4 It is a schematic diagram of the longitudinal cross-section structure of a plastic-steel composite reinforced plastic-coated steel pipe of the present invention.

[0022] Figure 5 This is a structural schematic diagram of area A of a plastic-steel composite reinforced plastic-coated steel pipe of the present invention.

[0023] As shown in the figure: 1. Plastic-coated steel pipe base; 2. Inner anti-corrosion coating; 3. Outer bonding layer; 4. Plastic-steel reinforcement layer; 5. Outer protective coating; 6. Metal wire; 7. Ridge. DETAILED DESCRIPTION

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", "center", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction structure and operation. Therefore, they cannot be understood as limitations on the present invention.

[0025] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "provided with," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0026] The present invention will be described in further detail below with reference to the accompanying drawings.

[0027] Combined with attachment Figure 1 To the attached Figure 5 , a plastic-steel composite reinforced plastic-coated steel pipe, comprising a plastic-coated steel pipe substrate 1, the inner surface of the plastic-coated steel pipe substrate 1 is fixedly provided with an inner anti-corrosion coating 2, the inner anti-corrosion coating 2 is made of epoxy resin material, and is used to prevent the inside of the plastic-coated steel pipe substrate 1 from being corroded by corrosive media, the thickness of the inner anti-corrosion coating 2 is 0.2-0.5mm, the outer surface of the plastic-coated steel pipe substrate 1 is fixedly provided with an outer bonding layer 3, the outer bonding layer 3 is made of polymer bonding material with a thickness of 0.1-0.3mm, a plastic-steel reinforcement layer 4 is fixedly provided on the outside of the outer bonding layer 3, the plastic-steel reinforcement layer 4 is made of polyvinyl chloride glass fiber composite material, the plastic-steel reinforcement layer 4 has a thickness of 2-5mm, and the outside of the plastic-steel reinforcement layer 4 is fixedly provided with an outer protective coating 5, the outer protective coating 5 is made of polyurethane material with a thickness of 0.3-0.8mm, a metal wire 8 is embedded in the plastic-steel reinforcement layer 4, and a number of ridges 10 are evenly distributed on the outer surface of the plastic-steel reinforcement layer 4, and the ridges 10 are made of the same material as the plastic-steel reinforcement layer 4 and are integrally formed.

[0028] The functions of the layered structures of the plastic-steel composite reinforced plastic-coated steel pipe of the utility model are as follows:

[0029] 1. Plastic-coated steel pipe substrate 1: As the supporting skeleton of the entire pipeline, it undertakes the main pressure-bearing function, ensuring that the pipeline can maintain its basic shape and structural integrity under various working conditions, and provides an attachment basis for other coatings and structural layers.

[0030] 2. Internal anti-corrosion coating 2: Made of epoxy resin, it has excellent chemical stability and adhesion. The thickness is between 0.2-0.5mm, which can effectively isolate the steel pipe substrate from the corrosive media transported inside, preventing the inner wall of the steel pipe from being corroded.

[0031] 3. External bonding layer 3: Made of polymer bonding material, with a thickness of 0.1-0.3mm. Its function is to tightly connect the steel pipe base and the external plastic steel reinforcement layer, ensuring a strong bond between the two and preventing separation or peeling between the layers due to external forces or environmental factors during use.

[0032] 4. Plastic-steel reinforcement layer 4: Made of a PVC fiberglass composite material and embedded with metal wires 8. This layer, 2-5mm thick, is the core structural layer that enhances the pipe's strength and rigidity. PVC provides excellent chemical resistance and flexibility, while the glass fiber significantly improves the material's tensile strength and impact resistance. The metal wire further enhances its overall mechanical properties, enabling the pipe to withstand higher pressures, tensions, and external impacts. This layer is widely applicable to high-pressure transmission systems and pipeline projects in complex stress environments, effectively improving pipeline reliability and safety.

[0033] 5. External protective coating 5: Made of polyurethane, with a thickness of 0.3-0.8mm. Its main function is to resist various corrosive factors in the external environment, such as ultraviolet rays, wind and rain, air pollution, chemicals, etc., and provide comprehensive protection for the pipeline.

[0034] 6. Ribs 10: Made of the same material as the plastic-steel reinforcement layer 4 and integrally formed, they are evenly spaced across the outer surface of the plastic-steel reinforcement layer. The rib design increases the surface area of ​​the pipe, which helps improve adhesion between the outer protective coating and the plastic-steel reinforcement layer, allowing the outer protective coating to adhere more firmly to the pipe surface and enhance external protection. Furthermore, the rib structure improves the pipe's bending and torsional resistance to a certain extent, enabling it to better disperse stress when subjected to bending or torsional forces, reducing the risk of localized deformation and damage, thereby further enhancing the pipe's overall mechanical properties and its ability to adapt to complex operating conditions.

[0035] This solution provides a preparation process for a plastic-steel reinforcement layer:

[0036] 1. Raw Material Preparation: Weigh polyvinyl chloride resin, glass fiber chopped strands, and an appropriate amount of additives (such as stabilizers, lubricants, and plasticizers) in the predetermined proportions and mix thoroughly to obtain a stable base raw material mixture. Prepare metal wire, such as stainless steel or galvanized steel wire, ensuring that the surface of the wire is clean and free of oil, rust, and other impurities to ensure good adhesion to the base raw material mixture.

[0037] 2. Extrusion: The mixed base raw material mixture is added to the twin-screw extruder. The heated screw melts and plasticizes the material, turning it into a uniform viscous fluid. The extruder screw pushes the material forward. When the material reaches the extruder head, the metal wire is evenly embedded into the extruded PVC glass fiber composite material through the die, tightly combining the metal wire and the composite material to form a preliminary plastic-steel reinforcement layer structure.

[0038] 3. Molding and Cooling: The plastic-steel reinforcement material with metal wire extruded from the extruder head enters the shaping die. By controlling the shape and size of the die cavity, the plastic-steel reinforcement layer obtains precise dimensions and surface finish, and ensures the stable position of the metal wire within the composite material. After shaping, the plastic-steel reinforcement layer enters the cooling water tank, where it is cooled by circulating water, allowing it to solidify quickly and improve the material's strength and dimensional stability.

[0039] 4. Surface treatment and quality inspection: After cooling, the surface of the plastic-steel reinforcement layer may have some minor flaws or unevenness, which requires surface grinding and polishing. The prepared plastic-steel reinforcement layer is subjected to quality inspection, including appearance inspection (such as surface flatness, color uniformity, presence of cracks, bubbles and other defects), size measurement (whether key dimensions such as thickness and width meet design requirements), physical property testing (such as tensile strength, bending strength, impact toughness and other mechanical performance indicators) and bonding strength testing between metal wire and composite materials. The plastic-steel reinforcement layer that passes the quality inspection enters the next process and is composited and assembled with other structural layers to finally be made into a plastic-steel composite reinforced plastic-coated steel pipe product.

[0040] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A plastic-steel composite reinforced plastic-coated steel pipe, comprising a plastic-coated steel pipe substrate (1), the inner surface of which is fixedly provided with an inner anti-corrosion coating (2), characterized in that: The outer surface of the plastic-coated steel pipe substrate (1) is fixedly provided with an outer bonding layer (3), the outer surface of the outer bonding layer (3) is fixedly provided with a plastic-steel reinforcement layer (4), the outer surface of the plastic-steel reinforcement layer (4) is fixedly provided with an outer protective coating (5), the interior of the plastic-steel reinforcement layer (4) is embedded with a metal wire (6), and the outer surface of the plastic-steel reinforcement layer (4) is evenly distributed with a plurality of ridges (7), and the ridges (7) are made of the same material as the plastic-steel reinforcement layer (4) and are integrally formed.

2. The plastic-steel composite reinforced plastic-coated steel pipe according to claim 1, characterized in that: The inner anti-corrosion coating (2) is made of epoxy resin and is used to prevent the interior of the plastic-coated steel pipe substrate (1) from being corroded by corrosive media. The thickness of the inner anti-corrosion coating (2) is 0.2-0.5 mm.

3. The plastic-steel composite reinforced plastic-coated steel pipe according to claim 1, characterized in that: The outer bonding layer (3) is made of polymer bonding material and has a thickness of 0.1-0.3 mm.

4. The plastic-steel composite reinforced plastic-coated steel pipe according to claim 1, characterized in that: The plastic-steel reinforcement layer (4) is made of polyvinyl chloride glass fiber composite material, and the thickness of the plastic-steel reinforcement layer (4) is 2-5 mm.

5. The plastic-steel composite reinforced plastic-coated steel pipe according to claim 1, characterized in that: The outer protective coating (5) is made of polyurethane and has a thickness of 0.3-0.8 mm.

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