Multi-layer weft reinforced steel skeleton plastic composite pipe

Abstract

The utility model discloses a multi-layer weft reinforced steel skeleton plastic composite pipe, which relates to the field of steel-plastic composite pipes and comprises a pipe body with thermoplastic plastic as a base body, and an internal reinforced phase is arranged between the inner wall and the outer wall of the pipe body. The internal reinforcement phase comprises a warp layer and a weft layer, the warp layer is composed of a plurality of steel wires arranged in the axial direction of the pipe body, and the weft layer is composed of steel wires spirally wound in the circumferential direction of the pipe body; a plurality of warp steel wires and weft steel wires are spirally wound and welded to form a steel mesh framework; at least two layers of weft layers are continuously arranged, and the contacted weft layers are arranged in the same rotating direction. According to the utility model, the at least two weft layers are spirally wound on the warp layer, the contacted weft layers are arranged in the same rotating direction, and the outer weft steel wires are arranged on the inner weft steel wires in a contact manner, so that the ring stiffness of the pipe is improved, and high internal pressure resistance and external pressure resistance are provided.

Description

Technical Field

[0001] The utility model relates to the field of steel-plastic composite pipes, and particularly relates to a multi-layer weft-reinforced steel skeleton plastic composite pipe. Background Art

[0002] With the industry's recognition of steel-plastic composite pipes, higher requirements have been put forward for the diameter and pressure of the pipes. The strength of the skeleton inside the pipes plays a decisive role in improving the pressure rating of the pipes.

[0003] Chinese Patent with the authorization announcement number CN211853060U discloses a multi-layer skeleton-reinforced plastic composite pipe, which includes a pipe body formed by an extrusion process. At least two layers of reinforcing skeletons are fixed between the inner wall and the outer wall of the pipe body by an extrusion process. The at least two layers of reinforcing skeletons include at least one of reinforcing skeleton A or reinforcing skeleton B. The reinforcing skeleton A includes multiple warp wires arranged along the circumferential direction of the pipe body, and each of the warp wires extends along the axial direction of the pipe body. The multiple warp wires are spirally wound and welded along the axial direction of the pipe body by weft wires, and both the warp wires and the weft wires are steel wires. The reinforcing skeleton B is a continuous integral grid structure.

[0004] In the above-mentioned disclosed patent, at least two layers of reinforcing skeletons are fixed between the inner wall and the outer wall of the pipe body by an extrusion process, so that pipes with relatively small pipe wall thickness can meet the pressure use requirements. However, for the reinforcing skeleton A, multiple warp wires are spirally wound and welded along the axial direction of the pipe body by a single layer of weft wire. Due to only a single layer of weft wire, its circumferential strength is relatively low, and the overall stability and durability are relatively poor, and it cannot provide high internal pressure and external pressure resistance. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a plastic composite pipe that can improve the ring stiffness of the pipe and provide high internal pressure and external pressure resistance.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0007] A multi-layer weft-reinforced steel skeleton plastic composite pipe includes a pipe body with a thermoplastic plastic as the matrix. The key technology lies in that: an internal reinforcing phase is provided between the inner wall and the outer wall of the pipe body; the internal reinforcing phase includes a warp wire layer and a weft wire layer. The warp wire layer is multiple steel wires arranged along the axial direction of the pipe body, and the weft wire layer is steel wires spirally wound along the circumferential direction of the pipe body; multiple warp wire steel wires and weft wire steel wires are spirally wound and welded to form a steel mesh skeleton; the weft wire layer is continuously arranged at least 2 layers, and the adjacent weft wire layers are set with the same winding direction.

[0008] Further preferably, when two or more layers of weft wire layers are provided, the outer layer of weft wire is in contact with and disposed above the inner layer of weft wire, and the warp wire and the inner layer of weft wire are welded and fixed at the contact points. Either intermittent welding or continuous welding may be used between the outer layer of weft wire and the inner layer of weft wire.

[0009] Further preferably, during spiral winding and welding, the outer layer of weft wire is limited in position, and the outer layer of weft wire is located directly above the inner layer of weft wire.

[0010] Further preferably, the weft wire layer can be obtained by spiral welding of single-strand weft wire or synchronous spiral welding of multi-strand weft wire. The number of strands of the weft wire in the contacting weft wire layers is the same, and the pitch is the same, and the weft pitch ≥ 1 mm.

[0011] As another parallel embodiment, when the pitch of the outer layer of weft wire is an integer multiple of the pitch of the inner layer of weft wire, the number of strands of the outer layer of weft wire is reduced by the same multiple.

[0012] Further preferably, the wire diameters of the weft wires in the contacting weft wire layers can be the same or different, and the cross-sectional shapes of the weft wires and the warp wires are circular, rectangular or other shapes that meet the requirements.

[0013] Further preferably, when there is one layer of warp wire layer between two layers of weft wire layers, the winding directions of the two layers of weft wire layers can be the same or different.

[0014] Further preferably, a plastic seal is provided on the end face of the pipe body, and the plastic seal is fixedly connected to the end face of the pipe body by melting or bonding; the plastic seal is made of the same material as the pipe body or other plastic materials that can be mutually dissolved and adhered to the pipe body material.

[0015] Further preferably, the inner wall and the outer wall of the pipe body are both formed of thermoplastic plastic.

[0016] Further preferably, the space between the steel mesh skeletons is filled with thermoplastic plastic.

[0017] The beneficial effects of adopting the above technical solutions are as follows:

[0018] 1. Compared with the prior art, by arranging at least two layers of weft wire layers spirally wound on the warp wire layer, and the contacting weft wire layers having the same winding direction, with the outer layer of weft wire in contact with and disposed above the inner layer of weft wire, the ring stiffness of the pipe is improved, and the ability to resist high internal pressure and external pressure is provided. It has strong advantages for pipes commonly used for buried and overhead applications, and the ability to resist deformation and bending is enhanced.

[0019] 2. The warp steel wires and the inner weft steel wires of the present utility model are fixed by welding at each contact point. The outer weft steel wires and the inner weft steel wires can be intermittently welded or continuously welded, providing higher mechanical strength and better impact resistance. The steel mesh structure with multiple layers of weft wires can more effectively disperse the load and pressure, thereby improving the compressive and anti-twisting properties of the pipeline, and at the same time greatly reducing the wall thickness of the pipe. During the extrusion molding process of the pipe body, the plastic passes through the steel mesh skeleton reinforcement structure, and the two form a stable interpenetrating structure, improving the connection strength between the steel mesh skeleton reinforcement structure and the pipe body itself, and greatly reducing the probability of delamination. By setting a plastic seal at the end face of the pipe body, the anti-corrosion property of the pipe end face is ensured to be consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the annular cross-section of an embodiment of the present utility model;

[0021] Figure 2 is Figure 1 an enlarged view of part A in

[0022] Figure 3 It is a sectional view of an embodiment of the present utility model;

[0023] Figure 4 is Figure 3 an enlarged view of part B in

[0024] In the figure: 1 - pipe body; 11 - inner plastic layer; 12 - outer plastic layer; 2 - warp layer; 3 - weft layer; 31 - inner weft steel wire; 32 - outer weft steel wire. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present utility model will be described below with reference to the accompanying drawings.

[0026] Referring to the attached Figures 1-4 As shown, a multi-layer weft-reinforced steel skeleton plastic composite pipe includes a pipe body 1 with a thermoplastic as the matrix. Between the inner wall and the outer wall of the pipe body 1 is an internal reinforcement phase; the internal reinforcement phase includes a warp layer 2 and a weft layer 3. The warp layer 2 is composed of multiple steel wires arranged along the axial direction of the pipe body, and the weft layer 3 is composed of steel wires spirally wound along the circumferential direction of the pipe body; multiple warp steel wires and weft steel wires are spirally wound and welded to form a steel mesh skeleton; the weft layer 3 is continuously arranged at least in 2 layers, and the adjacent weft layers 3 are set with the same helix direction.

[0027] As a preferred embodiment, two layers of weft layers 3 may be provided, wherein the outer weft wire 32 is disposed in contact with the inner weft wire 31. The warp wire and the inner weft wire 31 are welded and fixed at each intersection point, and the weft wires are welded and fixed. The welding between the weft wires may be intermittent welding or continuous welding, so that the reinforcing skeleton becomes an integral body, and at the same time, it is ensured that when the pipe is extrusion molded, the skeleton will not shift or deform inside the pipe.

[0028] In order to ensure that the outer weft wire 32 does not skew during welding with the inner weft wire 31, it is necessary to limit the outer weft wire 32 during welding to ensure that it is exactly above the inner weft wire 31 during welding.

[0029] As a preferred embodiment of the present invention, each layer of weft can be obtained by single-strand weft spiral welding or multi-strand weft synchronous spiral welding, but the number of strands of each layer of weft is the same. That is, when the inner weft layer 3 is obtained by welding 2 strands of weft, the outer weft layer 3 should also be obtained by welding 2 strands of weft, and the pitch of the inner weft layer 3 is the same as that of the outer weft layer 3.

[0030] Different from the above embodiment, the number of strands of the inner weft wire 31 and the outer weft wire 32 can be different. When the pitch of the outer weft wire 32 is an integer multiple of the pitch of the inner weft wire 31, in order to ensure that the outer weft wire 32 is always on top of the inner weft wire 31 during spiral winding welding, the number of strands of the outer weft wire 32 should be reduced by the same multiple. That is, when the number of strands of the inner weft wire 31 is 4 and the pitch is 6, and the pitch of the outer weft wire 32 is 12, the number of strands of the outer weft wire 32 should be 2.

[0031] During use, the minimum number of weft layers is 2 layers, and multiple layers can also be provided according to needs. The wire diameters of each layer of weft can be the same or different. The cross-sectional shapes of the warp and weft are generally circular, but can also be rectangular or other special-shaped structures.

[0032] The steel mesh skeleton reinforcement structure can have various forms. For example: one layer of warp + two layers of weft reinforcement structure, one layer of warp + three layers of weft reinforcement structure, one layer of warp + one layer of weft + one layer of warp + two layers of weft reinforcement structure, one layer of warp + two layers of weft + one layer of warp + one layer of weft reinforcement structure, one layer of warp + two layers of weft + one layer of warp + two layers of weft reinforcement structure, and so on. By analogy, different warp and weft welding combination structures are within the protection scope of this utility model. At the same time, when there is one layer of warp between two layers of weft, the helix directions of the two layers of weft can be the same or different.

[0033] The inner wall and the outer wall of the pipe body 1 are both made of thermoplastic plastics, namely the inner plastic layer 11 and the outer plastic layer 12. Since the inner wall and the outer wall of the pipe body are thermoplastic plastics, the inner plastic layer 11 is smooth with little resistance, minimizing the frictional loss along the pipe body 1, and the pipe body 1 as a whole has the advantages of corrosion resistance, wear resistance and non-scaling. In this embodiment, the steel mesh skeleton has gaps. During the extrusion molding process of the pipe body 1, the thermoplastic plastics and the steel mesh skeleton penetrate each other to obtain a stable pipe structure.

[0034] As a preferred embodiment, a plastic seal is provided on the end face of the pipe body 1, and the plastic seal is fixedly connected to the end face of the pipe body 1 by welding or bonding. The plastic seal is made of the same material as the pipe body 1 or other plastic materials that can be mutually dissolved and adhered to the material of the pipe body 1, ensuring that the end face of the pipe has consistent anti-corrosion properties.

[0035] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A multi-layer weft-reinforced steel skeleton plastic composite pipe, comprising a pipe body (1) with a thermoplastic plastic as a matrix, characterized in that: An internal reinforcement phase is provided between the inner wall and the outer wall of the tube body (1); the internal reinforcement phase comprises a warp layer (2) and a weft layer (3); the warp layer (2) is a plurality of steel wires arranged along the axial direction of the tube body, and the weft layer (3) is a steel wire spirally wound along the circumferential direction of the tube body; a plurality of warp steel wires and weft steel wires are spirally wound and welded to form a steel mesh skeleton; the weft layer (3) is provided in at least two layers in succession, and the contacting weft layers (3) are provided with the same rotation direction.

2. The multi-layer weft-reinforced steel skeleton plastic composite pipe according to claim 1, characterized in that: When the weft wire layer (3) is provided with two or more layers, the outer weft wire steel wire (32) is provided in contact with the inner weft wire steel wire (31), the warp wire steel wires and the inner weft wire steel wire (31) are welded and fixed at the contact points, and the outer weft wire steel wire (32) and the inner weft wire steel wire (31) can be intermittently welded or continuously welded.

3. The multi-layer weft-reinforced steel skeleton plastic composite pipe according to claim 2, characterized in that: The outer layer weft steel wire (32) is limited in position during spiral winding and welding, and the outer layer weft steel wire (32) is located directly above the inner layer weft steel wire (31).

4. The multi-layer weft-reinforced steel skeleton plastic composite pipe according to claim 1, characterized in that: The weft layer (3) can be obtained by spiral welding a single weft steel wire or by synchronously spiral welding a plurality of weft steel wires. The contacting weft layers (3) have the same number of weft steel wires and the same pitch, and the weft pitch is ≥1 mm.

5. The multi-layer weft-reinforced steel skeleton plastic composite pipe according to claim 2, characterized in that: When the pitch of the outer layer weft steel wire (32) is an integer multiple of the pitch of the inner layer weft steel wire (31), the number of strands of the outer layer weft steel wire (32) is reduced by the same multiple.

6. The multi-layer weft-reinforced steel skeleton plastic composite pipe according to claim 1, characterized in that: The diameters of the weft steel wires of the contacting weft layers (3) may be the same or different, and the cross-sectional shapes of the weft steel wires and the warp steel wires are circular or rectangular.

7. The multi-layer weft-reinforced steel skeleton plastic composite pipe according to claim 1, characterized in that: When there is a warp layer (2) between two weft layers (3), the rotation directions of the two weft layers (3) may be the same or different.

8. The multi-layer weft-reinforced steel skeleton plastic composite pipe according to claim 1, characterized in that: A plastic seal is provided on the end surface of the tube body (1), and the plastic seal is fixedly connected to the end surface of the tube body (1) by welding or bonding; the plastic seal is made of the same material as the tube body (1).

9. The multi-layer weft-reinforced steel skeleton plastic composite pipe according to claim 1, characterized in that: The inner wall and the outer wall of the tube body (1) are both formed of thermoplastic plastic.

10. The multi-layer weft-reinforced steel skeleton plastic composite pipe according to claim 1, characterized in that: The gaps between the steel mesh skeleton are filled with thermoplastic.

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