Continuous steel wire bidirectional reinforced cohesive plastic high-pressure composite pipe

Abstract

The utility model discloses a continuous steel wire bidirectional reinforced cohesive plastic high-pressure composite pipe which specifically comprises a plastic inner pipe layer, a continuous steel wire tensile reinforced layer, a continuous steel wire annular spiral winding reinforced layer and a plastic outer protective layer from inside to outside in sequence. The continuous steel wire tensile reinforcing layer of the bidirectional reinforcing layer is formed by a plurality of continuous steel wires which are dipped and coated with plastic melt in a hot melting laying mode and attached to the inner pipe layer in the axial direction of the inner pipe. The continuous steel wire annular spiral winding reinforcing layer of the bidirectional reinforcing layer is formed by annularly and spirally winding a single continuous steel wire which is dipped and coated with a plastic melt according to a preset angle and laying and bonding the continuous steel wire on the continuous steel wire tensile reinforcing layer in a hot melting manner. A unit is formed by the continuous steel wire tensile reinforcing layer and the continuous steel wire annular spiral winding reinforcing layer, a bidirectional reinforcing layer can be formed by multiple sets of units according to the pressure bearing requirement of the composite pipe, and therefore the composite pipe body which is of a three-layer integrated structure and function and is high in rigidity, tensile and resistant to pressure is formed.

Description

Technical Field

[0001] The utility model belongs to the field of plastic composite pipe manufacturing, in particular to a continuous steel wire bidirectionally reinforced adhesive plastic high-pressure composite pipe. Background Art

[0002] As a new type of composite pipe, continuous fiber reinforced plastic pipe has a series of unique advantages such as light weight, high strength, low cost, corrosion resistance, and green environmental protection. It has great application prospects in municipal, water conservancy, coal, chemical, oil and gas and other fields, and has received widespread attention from the pipeline industry. Therefore, in recent years, the research on continuous glass fiber reinforced polyethylene pipe composite materials and their processes has progressed rapidly.

[0003] Domestic and foreign pipeline companies have conducted in-depth research on continuous fiber reinforced pipe composite materials and their processes, and have achieved some results. However, most of the current products are concentrated in small-diameter (below 250mm) pipes or low-pressure drainage pipes and other market areas. There are many problems in the development of medium and large-diameter pipes with high pressure resistance, high rigidity and high flexibility. The reinforced core layer requires many layers to meet the requirements, and the product cost is high, the production efficiency is low, and the market competitiveness is not strong. These shortcomings make it impossible to promote and apply them on a large scale in the medium and large-diameter pipe market. Fiber-reinforced large-diameter thermoplastic pipes are still in the development stage both at home and abroad. Summary of the Invention

[0004] To solve the technical problem of medium and large diameter pipelines being unable to meet the requirements of high tensile and high compressive strength, a continuous steel wire bidirectional reinforced adhesive plastic high-pressure composite pipe is provided to meet the requirements of high stiffness, tensile strength, and compressive strength.

[0005] The utility model provides the following technical solutions:

[0006] A continuous steel wire bidirectional reinforced adhesive plastic high-pressure composite pipe,

[0007] From the inside to the outside, it includes a plastic inner tube layer, a continuous steel wire tensile reinforcement layer, a continuous steel wire circumferential spiral winding reinforcement layer and a plastic outer protective layer;

[0008] The plastic inner tube layer is an inner tube extruded by an extruder;

[0009] The continuous steel wire tensile reinforcement layer is composed of multiple continuous steel wires impregnated with plastic melt and fused to the inner tube layer along the axial direction of the inner tube, and the steel wires are closely arranged, bonded and fused together with the wires;

[0010] The continuous steel wire circumferential spiral winding reinforcement layer is formed by a single continuous steel wire impregnated with plastic melt and then circumferentially spirally wound at a preset angle and then hot-melted and bonded to the continuous steel wire tensile reinforcement layer, and the steel wire and the wire are closely arranged, bonded and bonded together;

[0011] A unit is composed of a continuous steel wire tensile reinforcement layer and a continuous steel wire circumferential spirally wound reinforcement layer. According to the pressure bearing requirements of the composite pipe, multiple groups of units are used to form a bidirectional reinforcement layer.

[0012] The angle β between the continuous steel wire hoop spiral winding of the continuous steel wire hoop spiral winding reinforcement layer and the axial direction of the pipe is 85°-89°.

[0013] Furthermore, the diameter of the composite pipe is not greater than 4000 mm.

[0014] Furthermore, the continuous steel wire is a single steel wire, a steel cord or a steel wire bundle, and its wire diameter is 0.2-1.7 mm. After being impregnated and coated with the plastic melt, the wire diameter is 0.3-2.0 mm, and the tensile strength is greater than 1500 MPa.

[0015] Furthermore, the plastic inner tube layer is a single thermoplastic plastic or a multi-layer inner tube composed of thermoplastic plastic, a barrier layer, an adhesive, and plastic.

[0016] Furthermore, the continuous steel wires of the continuous steel wire tensile reinforcement layer and the continuous steel wire circumferential spirally wound reinforcement layer are continuous steel wires impregnated and coated with thermoplastic melt.

[0017] Furthermore, the plastic outer protective layer is extruded by an extruder to form a covering outer protective layer or is extruded by an extruder and continuously wrapped and welded with structures of different shapes, and the structures are rectangular, trapezoidal, triangular, U-shaped or circular.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This utility model features a three-layer composite pipe body with high rigidity, tensile strength, and compressive strength, consisting of a plastic inner pipe layer, a bidirectionally reinforced unit layer consisting of a continuous steel wire tensile reinforcement layer and a continuous steel wire circumferentially spirally wound reinforcement layer, and a plastic outer protective layer. The bidirectionally reinforced unit layer, consisting of the continuous steel wire tensile reinforcement layer and the continuous steel wire circumferentially spirally wound reinforcement layer, independently or in conjunction with the inner and outer plastic pipe layers, bears the combined stresses of axial tension and circumferential pressure in the composite pipe.

[0020] 2. The pipe of the utility model has high rigidity and high flexibility, can withstand external pressure load, is a composite pipe with high rigidity, tensile strength and compression resistance, has reasonable structural design, is easy and quick to manufacture, is highly practical, and is suitable for promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the pipe structure diagram of this utility model.

[0022] Figure 2 Schematic diagram of the angle between the continuous steel wire circumferential spiral winding and the pipe axis.

[0023] In the figure: 1. Plastic inner layer tube; 2. Continuous steel wire tensile reinforcement layer; 3. Continuous steel wire circumferential spirally wound reinforcement layer; 4. Plastic outer protective layer. Implementation Method

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Figure 1 and Figure 2 As shown, the utility model is a continuous steel wire bidirectional reinforced adhesive plastic high-pressure composite pipe, such as Figure 1 As shown, from inside to outside, there are plastic inner pipe layer 1, continuous steel wire tensile reinforcement layer 2, continuous steel wire circumferential spirally wound reinforcement layer 3 and plastic outer protective layer 4. The diameter of the composite pipe is not greater than 4000mm.

[0026] The plastic inner tube layer (1) is an inner tube extruded by an extruder.

[0027] like Figure 1 As shown, the continuous steel wire tensile reinforcement layer 2 is composed of multiple continuous steel wires impregnated and coated with plastic melt, which are heat-melted and laid along the axial direction of the inner tube and fused to the plastic inner tube layer 1. The steel wires and the wire mesh are closely arranged, bonded and fused together, with no gaps between them. The continuous steel wire circumferential spiral winding reinforcement layer 3 is composed of a single continuous steel wire impregnated and coated with plastic melt, which is heat-melted and laid, bonded and fused to the continuous steel wire tensile reinforcement layer 2 at a preset angle. The steel wires and the wire mesh are closely arranged, bonded and fused together, with no gaps between them.

[0028] A unit is formed by a continuous steel wire tensile reinforcement layer 2 and a continuous steel wire circumferential spirally wound reinforcement layer 3. A bidirectional reinforcement layer can be formed by multiple groups of units according to the pressure bearing requirements of the composite pipe.

[0029] Figure 2 As shown, the angle β between the continuous steel wire hoop spirally wound reinforcement layer 3 and the axial direction of the pipe is 85°-89°.

[0030] Furthermore, the continuous steel wire may be a single steel wire or a steel cord or a steel wire bundle, with a wire diameter of 0.2-1.7 mm, a wire diameter of 0.3-2.0 mm after being impregnated and coated with the plastic melt, and a tensile strength greater than 1500 MPa.

[0031] Furthermore, the plastic inner layer tube is a single thermoplastic plastic or a multi-layer inner tube composed of thermoplastic plastic, barrier agent, adhesive, and plastic.

[0032] Furthermore, the thermoplastic plastic material is PP, PE or PERT.

[0033] Furthermore, the continuous steel wires of the continuous steel wire tensile reinforcement layer 2 and the continuous steel wire circumferential spirally wound reinforcement layer 3 are continuous steel wires impregnated and coated with thermoplastic melt.

[0034] Furthermore, the plastic outer protective layer 4 is formed by extruding a covering outer protective layer from an extruder or by continuously winding and welding different shaped structures extruded from an extruder, and the structures include rectangular, trapezoidal, triangular, U-shaped or circular.

[0035] This utility model comprises a three-layer composite pipe body with high rigidity, tensile strength, and compressive strength, consisting of a plastic inner pipe layer 1, a bidirectionally reinforced unit layer consisting of a continuous steel wire tensile reinforcement layer 2 and a continuous steel wire circumferentially spirally wound reinforcement layer 3, and a plastic outer protective layer 4. The bidirectionally reinforced unit layer, consisting of the continuous steel wire tensile reinforcement layer 2 and the continuous steel wire circumferentially spirally wound reinforcement layer 3, independently bears the combined stress of axial tension and circumferential pressure in the composite pipe, or in conjunction with the inner and outer plastic pipe layers.

[0036] Hoop load (stress): The hoop stress caused by internal pressure is borne by the spirally wound continuous fiber belt layer, with a design safety factor of 4.

[0037] Axial load (stress): The axial stress generated by uneven sinking during the manufacturing and handling process and after burial is borne by the axially hot-melt laid continuous fiber prepreg tape layer.

[0038] External pressure load: The outer layer is extruded by an extruder to form an outer protective layer or is formed by continuous winding and welding of various extruded structures. The structures include rectangular, trapezoidal, triangular, U-shaped, or circular. The structural diagram form is adopted, especially for large-diameter pipes, with high rigidity and high flexibility, and can withstand external pressure loads (such as underground laying).

[0039] Experimental measurements show that the high pressure of the pipeline system of the present invention is 0.8 MPa to 40 MPa, which meets the comprehensive mechanical requirements of axial tension and annular pressure for a diameter not greater than 4000 mm.

[0040] The utility model has a reasonable structural design, is convenient and quick to manufacture, has high practicality, and is suitable for promotion and use; the pipe of the utility model has high rigidity, high flexibility, high pressure resistance, can withstand external pressure load, and is a high rigidity, tensile and compressive composite pipe.

[0041] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A continuous steel wire bidirectionally reinforced adhesive plastic high-pressure composite pipe, characterized by: From the inside to the outside, it comprises a plastic inner tube layer (1), a continuous steel wire tensile reinforcement layer (2), a continuous steel wire circumferential spirally wound reinforcement layer (3) and a plastic outer protective layer (4); The plastic inner tube layer (1) is an inner tube extruded by an extruder; The continuous steel wire tensile reinforcement layer (2) is composed of a plurality of continuous steel wires impregnated with plastic melt and fused to the inner tube layer (1) along the axial direction of the inner tube, and the steel wires and the wires are closely arranged, bonded and fused together; The continuous steel wire circumferential spiral winding reinforcement layer (3) is formed by a single continuous steel wire impregnated with plastic melt and then circumferentially spirally wound at a preset angle and then hot-melted and bonded to the continuous steel wire tensile reinforcement layer (2), and the steel wire and the wire are closely arranged, bonded, and bonded together; A unit is formed by a continuous steel wire tensile reinforcement layer (2) and a continuous steel wire circumferential spirally wound reinforcement layer (3), and a bidirectional reinforcement layer is formed by multiple groups of units according to the pressure bearing requirements of the composite pipe; The angle β between the continuous steel wire hoop spiral winding of the continuous steel wire hoop spiral winding reinforcement layer (3) and the axial direction of the pipe is 85°-89°.

2. The continuous steel wire bidirectionally reinforced adhesive plastic high-pressure composite pipe according to claim 1, characterized in that: The diameter of the composite pipe is not greater than 4000 mm.

3. The continuous steel wire bidirectionally reinforced adhesive plastic high-pressure composite pipe according to claim 1, characterized in that: The continuous steel wire is a single steel wire, a steel cord or a steel wire bundle, and its wire diameter is 0.2-1.7 mm. After being impregnated and coated with plastic melt, the wire diameter is 0.3-2.0 mm, and the tensile strength is greater than 1500 MPa.

4. The continuous steel wire bidirectionally reinforced adhesive plastic high-pressure composite pipe according to claim 1, characterized in that: The plastic inner tube layer (1) is a single thermoplastic plastic or a multi-layer inner tube composed of thermoplastic plastic, a barrier layer, an adhesive, and plastic.

5. The continuous steel wire bidirectionally reinforced adhesive plastic high-pressure composite pipe according to claim 1, characterized in that: The continuous steel wires of the continuous steel wire tensile reinforcement layer (2) and the continuous steel wire circumferential spirally wound reinforcement layer (3) are continuous steel wires impregnated with thermoplastic plastic and coated with plastic melt.

6. The continuous steel wire bidirectionally reinforced adhesive plastic high-pressure composite pipe according to claim 1, characterized in that: The plastic outer protective layer (4) is formed by extruding a plastic outer protective layer from an extruder or by continuously winding and welding different shaped structures extruded from an extruder. The structure is rectangular, trapezoidal, triangular, U-shaped or circular.

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