Steel wire mesh framework PE composite pipe

Abstract

The utility model relates to the technical field of composite pipes, in particular to a steel wire mesh framework PE composite pipe which comprises a PE outer pipe layer, an inner pipe layer and a steel wire mesh framework layer arranged between the PE outer pipe layer and the inner pipe layer, and hot melt adhesive is filled between the steel wire mesh framework layer and the PE outer pipe layer and between the steel wire mesh framework layer and the inner pipe layer. The steel wire mesh framework layer comprises an outer steel wire mesh, an inner steel wire mesh and a steel sheet layer arranged between the outer steel wire mesh and the inner steel wire mesh; in addition, two flexible transition layers are further included; the two flexible transition layers are arranged between the steel wire mesh framework layer and the PE outer pipe layer and between the steel wire mesh framework layer and the PE inner pipe layer respectively and can be chemically bonded with the hot melt adhesive. A plurality of anchoring points are pre-pressed on the surfaces of the outer steel wire mesh and the inner steel wire mesh; a plurality of grooves are formed in the surface of the steel sheet layer. The problem that a multi-layer composite structure of an existing steel wire mesh framework composite pipe is prone to layering can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of composite pipe, concretely relates to a steel wire mesh skeleton PE composite pipe. BACKGROUND

[0002] Steel wire mesh skeleton composite pipe is also called steel wire mesh skeleton polyethylene (PE) composite pipe, which is a new type of pipe material with a net-shaped skeleton formed by left and right spiral winding of high-strength steel wires as a reinforcing body, high-density polyethylene (HDPE) as a base body, and high-performance HDPE modified adhesive resin tightly connecting the steel wire skeleton and the inner and outer high-density polyethylene together.

[0003] The existing steel wire mesh skeleton composite pipe adopts hot melt adhesive bonding process to realize the combination of the polyethylene layer and the reinforcing layer. Such structure forms a whole through the adhesion of the steel wire mesh and the inner and outer plastic layers, which has a certain strength at room temperature, but has significant defects in complex working conditions: first, hot melt adhesive is sensitive to temperature, and is prone to softening or embrittlement in long-term high-temperature or alternating thermal stress environment, resulting in interlayer bonding force degradation and delamination risk; second, although the multi-layer composite structure (such as the first steel wire mesh layer, steel sheet winding layer and second steel wire mesh layer in patent CN217482181U) improves the theoretical strength through stacking, the interlayers still rely on pure adhesive fixing, and the interface lacks mechanical interlocking mechanism, which is prone to interlayer slip and accelerates adhesive failure when the pipe is bent, vibrated or externally impacted; third, the thermal expansion coefficients of polyethylene and metal materials are significantly different, and the interface thermal stress concentrates in the adhesive layer when the temperature fluctuates, further aggravating the debonding problem.

[0004] Therefore, there is an urgent need for an innovative design that can retain the strength advantage of multi-layer composite structure and improve long-term reliability from the interface bonding mechanism. UTILITY MODEL CONTENT

[0005] Therefore, the utility model aims at providing a steel wire mesh skeleton PE composite pipe to solve the problem of easy delamination of the multi-layer composite structure of the existing steel wire mesh skeleton composite pipe.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A steel wire mesh framework PE composite pipe, comprising a PE outer pipe layer, an inner pipe layer and a steel wire mesh framework layer arranged between the PE outer pipe layer and the inner pipe layer, wherein the steel wire mesh framework layer and the PE outer pipe layer and the inner pipe layer are filled with hot melt adhesive; the steel wire mesh framework layer comprises an outer steel wire mesh, an inner steel wire mesh and a steel sheet layer arranged between the outer steel wire mesh and the inner steel wire mesh; in addition, two flexible transition layers are further included; the two flexible transition layers are respectively arranged between the steel wire mesh framework layer and the PE outer pipe layer and the inner pipe layer, and can form chemical bonding with the hot melt adhesive; the surfaces of the outer steel wire mesh and the inner steel wire mesh are pre-pressed with a plurality of anchoring points; and the surface of the steel sheet layer is processed with a plurality of grooves.

[0008] As a further scheme of the utility model: wherein the flexible transition layer is a layer of woven glass fiber pretreated with silane coupling agent.

[0009] As a further scheme of the utility model: wherein the anchoring point is a micro concave pit.

[0010] As a further scheme of the utility model: wherein the steel sheet layer is two spiral steel sheets, and the two spiral steel sheets are cross-wound with opposite spiral angles.

[0011] As a further scheme of the utility model: wherein the groove is spiral-shaped, and the spiral angle thereof is the same as that of the corresponding spiral steel sheet.

[0012] Due to the adoption of the above technical scheme, the utility model has the following beneficial effects:

[0013] The steel wire mesh framework PE composite pipe provided by the utility model significantly improves the interfacial bonding force between the steel wire mesh framework layer and the inner and outer pipe layers through the chemical bonding of the flexible transition layer and the hot melt adhesive, avoids the delamination problem of traditional pure physical adhesion, and simultaneously, the glass fiber transition layer as a buffer medium can absorb the interfacial stress generated by the difference in thermal expansion coefficient between polyethylene and metal materials, reduces the risk of cracking of the adhesive layer caused by thermal cycling (such as high temperature-low temperature alternation). In addition, through the design of the anchoring points on the surfaces of the outer / inner steel wire mesh and the surface grooves of the steel sheet layer, the hot melt adhesive forms a "glue nail" structure, the shear resistance is greatly improved through mechanical interlocking, and the interlayer slip during pipe bending or impact is effectively resisted.

[0014] Compared with the prior art, the utility model breaks through the limitation of traditional composite pipes relying on a single adhesion mode through the action of "chemical bonding + mechanical anchoring", fundamentally solves the delamination problem, and simultaneously takes into account the structural strength and long-term durability. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 The structure diagram of the steel wire mesh framework layer of the steel wire mesh framework PE composite pipe according to the embodiments of the present application is shown in the figure.

[0017] Figure 2 The structure diagram of the steel wire mesh framework PE composite pipe according to the embodiments of the present application is shown in the figure. Figure 1 The structure diagram of the steel wire mesh framework PE composite pipe according to the embodiments of the present application is shown in the figure.

[0018] The corresponding relationship between the annotations of the figures and the component names in the figure is as follows:

[0019] 1, PE outer pipe layer; 2, inner pipe layer; 3, steel wire mesh framework layer; 31, outer steel wire mesh; 32, inner steel wire mesh; 33, steel sheet layer; 331, groove; 4, flexible transition layer; 5, anchoring point. DETAILED DESCRIPTION

[0020] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the following description is considered to be exemplary in nature rather than limiting.

[0021] Please refer to Figure 1 and Figure 2 In one embodiment of the steel wire mesh framework PE composite pipe provided by the present application, the steel wire mesh framework PE composite pipe comprises a PE outer pipe layer 1, an inner pipe layer 2 and a steel wire mesh framework layer 3 arranged between the PE outer pipe layer 1 and the inner pipe layer 2, and hot melt adhesive is filled between the steel wire mesh framework layer 3 and the PE outer pipe layer 1 and the inner pipe layer 2; the combination of the PE outer pipe layer 1, the inner pipe layer 2 and the steel wire mesh framework layer 3 is realized by hot melt adhesive bonding process; the steel wire mesh framework layer 3 comprises an outer steel wire mesh 31, an inner steel wire mesh 32 and a steel sheet layer 33 arranged between the outer steel wire mesh 31 and the inner steel wire mesh 32; the above belongs to the conventional design of the steel wire mesh framework composite pipe in the prior art.

[0022] Importantly, the steel wire mesh framework PE composite pipe further comprises two flexible transition layers 4; the two flexible transition layers 4 are respectively arranged between the steel wire mesh framework layer 3 and the outer pipe layer and the inner pipe layer 2, and can be chemically bonded with the hot melt adhesive; specifically, the flexible transition layer 4 is a glass fiber woven mesh with a thickness of 0.2 mm, which is pretreated with a silane coupling agent, chemically bonded with the hot melt adhesive, enhances the interfacial bonding force, and the glass fiber woven mesh as a buffer layer can absorb the thermal expansion stress difference of different materials (steel and PE) and reduce the risk of adhesive layer cracking.

[0023] Wherein, the outer steel wire mesh 31 and the inner steel wire mesh 32 are pre-pressed with a plurality of anchor points 5 on the surface, the anchor point 5 is a pit, and the steel sheet layer 33 is processed with a plurality of grooves 331 on the surface; Specifically, the outer steel wire mesh 31 and the inner steel wire mesh 32 are uniformly distributed with micro pits on the surface by stamping or laser processing, and the grooves 331 on the surface of the steel sheet layer 33 extend along the length direction of the steel sheet layer 33. If the grooves 331 have multiple, they are arranged along the width direction of the steel sheet layer 33. The design of the anchor point 5 and the groove 331 makes the hot melt adhesive fill the pit / groove 331 to form a "glue nail", providing mechanical anchoring effect, thereby improving the shear strength of the adhesive layer.

[0024] As a preferred embodiment, the steel sheet layer 33 is two spiral steel sheets, and the two spiral steel sheets are cross-wound with opposite spiral angles. The cross-wound design of the two spiral steel sheets can form a mesh support, reduce local stress concentration, and at the same time, the dense arrangement reduces the exposed area of the hot melt adhesive, delaying the aging of the adhesive layer caused by medium penetration.

[0025] Specifically, two grooves 331 are provided on each spiral steel sheet, and both are spiral, and the spiral angle of the groove 331 is the same as that of the corresponding spiral steel sheet.

[0026] The preparation method of the steel wire mesh framework PE composite pipe of the utility model is as follows:

[0027] Step 1: surface pretreatment of the steel wire mesh framework layer 3

[0028] a) Anchor point 5 processing: using laser micro-etching process to form uniformly distributed hemispherical pits on the surface of the steel wire of the outer steel wire mesh 31 and the inner steel wire mesh 32 (pit diameter 0.5-1mm, depth 0.2-0.3mm, pitch 2-3mm), and at the same time, grooves 331 are processed on the surface of the steel sheet layer 33 (slot width 0.8-1.2mm, slot depth 0.3-0.5mm).

[0029] b) Surface cleaning: pickling and phosphating treatment is performed on the processed outer steel wire mesh 31, inner steel wire mesh 32 and steel sheet layer 33 to remove the oxide layer and increase the surface roughness.

[0030] Step 2: preparation of the flexible transition layer 4

[0031] a) Glass fiber mesh pretreatment: the glass fiber woven mesh is immersed in an ethanol solution containing a silane coupling agent, and after drying, an active surface is formed.

[0032] b) Transition layer composite: the treated glass fiber mesh is attached to the outer surface of the inner tube layer 2 and the inner surface of the PE outer tube layer 1, and is pre-fixed by a hot pressing process.

[0033] Step 3: Assembly of multi-layer skeleton composite structure

[0034] a) Inner steel wire mesh 32 fixation: the inner steel wire mesh 32 with anchor points 5 is wound on the outer glass fiber mesh of the inner tube layer 2, and at the same time, molten hot melt adhesive (adhesive layer thickness 0.1-0.2mm) is sprayed to make the adhesive penetrate into the recesses and glass fiber mesh pores.

[0035] b) Steel sheet layer 33 winding: using a double-end winding machine, two galvanized steel strips (thickness 0.15mm, width 10mm) are cross-wound on the surface of the inner steel wire mesh 32.

[0036] c) Outer steel wire mesh 31 covering: the outer steel wire mesh 31 with anchor points 5 is spirally wound outside the staggered steel sheet layer 33, and the mesh direction is staggered with the inner steel wire mesh 32 to form an interlocking structure.

[0037] Step 4: Outer tube layer co-extrusion

[0038] a) Hot melt adhesive secondary spraying: hot melt adhesive is sprayed on the outer surface of the steel wire mesh skeleton layer 3, focusing on filling the spiral grooves of the steel sheet layer 33 and the interlayer gap of the inner and outer steel wire meshes 31.

[0039] b) PE outer tube co-extrusion: using a double screw extruder, high density polyethylene and modified adhesive resin are co-extruded at high temperature, and the molten PE material is embedded in the anchor points 5 and the glass fiber mesh through mold pressure, and after cooling and setting, an integrated composite pipe is formed. The above described, only for the preferred specific embodiments of the present application, but the scope of the present application is not limited to this, any skilled in the art of the technical personnel in the technical range disclosed by the present application, according to the technical scheme of the present application and the utility model concept of the present application are equivalent to replace or change, should be covered in the scope of protection of the present application.

Claims

1. A steel wire mesh framework PE composite pipe, comprising a PE outer pipe layer (1), an inner pipe layer (2), and a steel wire mesh framework layer (3) arranged between the PE outer pipe layer (1) and the inner pipe layer (2), wherein the steel wire mesh framework layer (3) and the PE outer pipe layer (1) and the inner pipe layer (2) are filled with hot melt adhesive; the steel wire mesh framework layer (3) comprises an outer steel wire mesh (31), an inner steel wire mesh (32), and a steel sheet layer (33) arranged between the outer steel wire mesh (31) and the inner steel wire mesh (32); characterized in that, Two flexible transition layers (4) are further included; the two flexible transition layers (4) are respectively arranged between the steel wire mesh framework layer (3) and the PE outer pipe layer and inner pipe layer (2), and can be chemically bonded with the hot melt adhesive; the outer steel wire mesh (31) and the inner steel wire mesh (32) are both pre-pressed with a plurality of anchoring points (5); and the steel sheet layer (33) is processed with a plurality of grooves (331).

2. The steel wire reinforced PE composite pipe according to claim 1, characterized in that, The flexible transition layer (4) is a layer of woven glass fiber pretreated with a silane coupling agent.

3. The steel wire reinforced PE composite pipe according to claim 1, characterized in that, The anchoring point (5) is a micro pit.

4. The steel wire reinforced PE composite pipe according to claim 3, characterized in that, The steel sheet layer (33) is two spiral steel sheets, and the two spiral steel sheets are cross-wound with opposite spiral angles.

5. The steel wire reinforced PE composite pipe according to claim 4, characterized in that, The grooves (331) are spiral, and the spiral angle is the same as that of the corresponding spiral steel sheet.

Images