CN108036119A - A kind of new steel mesh plastic composite pipe - Google Patents

Abstract

The invention relates to a plastic pipe, in particular to a novel steel mesh plastic composite pipe. A new steel mesh plastic composite pipe includes an outer plastic layer and an inner plastic layer, the outer plastic layer covers the inner plastic layer, and it is characterized in that: the inner plastic layer is along the axial direction of the composite pipe A steel wire is provided, the surface of the steel wire is covered with a layer of hot melt adhesive 1, a layer of hot melt adhesive 2 is arranged between the outer plastic layer and the inner plastic layer, and a layer of hot melt adhesive 2 is arranged in the second layer of hot melt adhesive Steel mesh layer. Because the invention adopts the structure of axial steel wire and circumferential steel wire mesh at the same time, the rigid strength of the pipe is improved, and it is not easy to be bent and deformed, and is more suitable for the working condition of overhead installation.

Description

A New Steel Mesh Plastic Composite Pipe

technical field

The invention relates to a plastic pipe, in particular to a novel steel mesh plastic composite pipe.

Background technique

Steel-plastic composite pressure pipes are widely used in municipal buried water supply, building buried water supply, buried fire water supply, industrial sewage discharge (pressure pipe), industrial acid-base solution and powder or slurry transportation. There are two types of composite pipes in the domestic market: steel skeleton polyethylene plastic composite pipe and steel mesh skeleton plastic composite pipe.

Existing steel skeleton plastic polyethylene composite pipe (structure such as patent No. CN98119383.8, name is described in the Chinese invention patent of " mesh steel skeleton-manufacturing method and device of mesh steel skeleton of plastic composite pipe ") , it is usually necessary to make the steel wire into a mesh steel skeleton first, and the mesh steel skeleton is composed of steel wires in the axial warp and the circumferential weft of the pipe, and then extruded on the steel skeleton, in order to ensure the rigidity of the steel skeleton during the extrusion process The steel wire is not deformed and shifted, and each cross contact point of the warp and weft of the steel skeleton needs to be welded and fixed in advance, the production speed is too slow and the efficiency is low. The tensile strength of the steel wire welding is reduced, which reduces the compressive strength of the steel. In order to make the steel skeleton in the middle of the composite pipe wall without deformation and too biased towards the outside or inside of the pipe wall, it is necessary to thicken the pipe wall and use thicker steel wires to make the steel skeleton, which greatly increases the composite pipe wall. Tube production costs. Since the two materials of steel wire and polyethylene plastic cannot be bonded naturally, the thermal expansion and contraction during use and the impact of the fluid pressure conveyed in the pipeline, the steel-plastic composite pipe is prone to the problem of delamination of steel wire and plastic, resulting in the fluid flowing from the pipe port. Therefore, during construction and installation, the exposed steel wire at the pipe port needs to be processed, injected or welded to seal the ring, and the pipe port is sealed to prevent leakage during fluid transportation. The installation and construction process of this sealed port is complicated and time-consuming, which limits the application range of this kind of pipe.

In order to overcome the shortcomings of the above-mentioned patent No. CN98119383.8 pipe, a steel mesh skeleton plastic composite pipe was invented in China (the structure is such as the patent No. CN200420105205.8, and the name is "winding device for preparing metal wire reinforced composite plastic pipe" Chinese invention patent mentioned). In the production process, the inner plastic tube of the pipe is first extruded by a plastic extruder, and the outer wall of the inner plastic tube formed by cooling is wound with a steel wire mesh skeleton with a cross structure in forward and reverse directions, and then a special hot melt adhesive is extruded to cover all the steel wires. Finally, extrude a layer of plastic on the outer layer of the pipe, and use a special hot-melt adhesive to bond the inner and outer plastic and the steel mesh skeleton layer. This product structure can effectively avoid the hidden danger of leakage due to the unbonded steel wire and plastic, and the steel wire is wound on the outer wall of the inner plastic tube, which is not limited by the welding production speed of the steel wire mesh skeleton, and the production efficiency is greatly improved. Since the angle between the winding angle of the steel wire of the pipe and the axial direction of the pipe is 54 degrees, it can satisfy the optimal balance of the axial and ring inner pressure of the pipe. However, compared with the above-mentioned patent number CN98119383.8 pipe steel wire warp parallel to the pipe axial direction, pipe CN200420105205.8 has significantly lower rigidity in both the axial direction and the circumferential direction, which is not conducive to the working condition requirements of overhead installation. , easy to bend and deform.

Contents of the invention

The purpose of the present invention is to solve the lack of performance in the prior art, and provide a high-strength product that can avoid the hidden danger of compound delamination of the two materials, and can also choose to increase the wear-resistant, anti-corrosion, and anti-bacterial inner layer according to user needs. , Self-lubricating functional layer, in order to improve the bonding strength between the steel wire of the composite pipe and the hot melt adhesive, the outer surface of the steel wire is embossed, and the intersection of the steel wires between the axial warp and the circumferential weft does not need to be welded, and the production efficiency is high. The invention is a novel steel mesh plastic composite pipe with improved performance in various aspects.

A technical scheme of the present invention is as follows: a novel steel mesh plastic composite pipe includes an outer plastic layer and an inner plastic layer, the outer plastic layer is outside the inner plastic layer, and it is characterized in that: the inner layer The plastic layer is provided with a steel wire along the axial direction of the composite pipe, the surface of the steel wire is covered with a layer of hot melt adhesive 1, and a layer of hot melt adhesive 2 is arranged between the outer plastic layer and the inner plastic layer. A steel wire mesh layer is arranged in the second layer of hot melt adhesive.

As a further technical solution of this technical solution, the steel wire mesh layer is helically wound in the second layer of hot melt adhesive in a one-way left-handed or one-way right-handed direction or a two-way left-handed and right-handed direction. The included angle is greater than 0 degrees and less than 90 degrees.

As a further technical solution of this technical solution, patterns are pressed on the outer surfaces of the steel wire and the steel mesh layer, and a functional layer is provided on the inner wall of the inner plastic layer.

As a further technical solution of the present technical solution, the steel wires are evenly distributed in the circumferential direction, and the distance between each steel wire and the axial center line of the composite pipe is equal.

As a further technical solution of the present technical solution, the distance between the steel wire and the inner side of the inner plastic layer is greater than the distance from the outer side of the inner plastic layer.

As another technical solution of the present invention, a new steel mesh plastic composite pipe includes an outer plastic layer and an inner plastic layer, the outer plastic layer is outside the inner plastic layer, and the outer plastic layer A layer of hot-melt adhesive is arranged between the inner plastic layer and a steel wire mesh layer and a steel wire layer are arranged in the hot-melt adhesive layer, and the steel wire layer is distributed in a circular shape along the axial direction of the composite pipe. The position in the hot melt adhesive layer is close to the inner plastic layer, and the steel mesh layer is in the position close to the outer plastic layer in the hot melt adhesive layer.

As a further technical solution of this technical solution, the steel wire mesh layer is helically wound in the hot melt adhesive layer in a one-way left-handed or one-way right-handed direction or a two-way left-handed and right-handed direction, and the steel wire of the steel mesh layer and the composite pipe The angle between the axes is greater than 54 degrees and less than 88 degrees.

As a further technical solution of this technical solution, the outer surfaces of the steel wire layer and the steel mesh layer are pressed with patterns, the inner wall of the inner plastic layer is provided with a functional layer, and each steel wire of the steel wire layer is connected with the composite pipe The axes are equidistant from each other.

Compared with the prior art, the beneficial effects of the present invention are as follows.

1. Since the present invention adopts the structure of axial steel wire and circumferential steel wire mesh at the same time, the rigid strength of the pipe is improved, and it is not easy to bend and deform, so it is more suitable for the working condition of overhead installation.

2. Hot melt adhesive is used to cover the axial steel wire and the circumferential winding steel wire, which solves the problem of delamination of steel wire and plastic, eliminates the hidden danger of leakage and explosion at the pipe end, and avoids complicated sealing work.

3. After the outer surface of the steel wire is embossed, the long-term bonding strength between the steel mesh and the plastic is improved, and the steel-plastic delamination caused by the thermal expansion and cold contraction of the composite pipe due to the environmental temperature change during the long-term use of the composite pipe is effectively avoided.

4. A special functional layer is added to the inner layer, which can realize the wear-resistant, anti-corrosion, anti-bacterial and self-lubricating functions required by the pipeline.

5. The axial steel wire and the hoop steel wire are bonded with the plastic layer using hot melt adhesive, and the intersection of the steel wire does not need to be welded and fixed, the production speed is greatly improved, and the production cost is reduced.

6. Hot-melt adhesive is used for bonding, no need to weld the axial and circumferential winding steel wires, avoiding the reduction of tensile strength at the welding place of the steel wires, and effectively utilizing the tensile strength properties of the steel wires.

Description of drawings

Fig. 1 is a schematic diagram showing a layered cutaway structure of an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view of Fig. 1 of the present invention.

Fig. 3 is a schematic diagram showing the structure of another embodiment of the present invention in layered section.

FIG. 4 is a schematic cross-sectional view of FIG. 3 of the present invention.

In the figure, inner plastic layer 2, hot melt adhesive one 3, steel wire 4, steel mesh layer 5, hot melt adhesive two 6, functional layer 7, outer plastic layer 1', inner plastic layer 2', steel wire mesh Layer 3', steel wire layer 4', hot melt adhesive layer 5', functional layer 6'.

Detailed ways

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Embodiment one.

As shown in Figures 1 and 2, a new type of steel mesh plastic composite pipe includes an outer plastic layer 1 and an inner plastic layer 2, the outer plastic layer 1 is outside the inner plastic layer 2, and the inner plastic layer The plastic layer 2 is provided with a steel wire 4 along the axial direction of the composite pipe, the surface of the steel wire 4 is covered with a layer of hot melt adhesive 3, and a layer of hot melt adhesive 3 is arranged between the outer plastic layer 1 and the inner plastic layer 2. Melt adhesive 2 6, a steel wire mesh layer 5 is arranged in the hot melt adhesive 2 6 layer. The steel mesh layer 5 is helically wound in the 26 layers of hot melt adhesive in a unidirectional left-handed direction, and the included angle between the steel wires of the steel mesh layer 5 and the axis is 10 degrees. Patterns are embossed on the outer surfaces of the steel wires 4 and the steel mesh layer 5 . A functional layer 7 is provided on the inner wall of the inner plastic layer 2 .

The steel wires 4 are evenly distributed in the circumferential direction, and the distance between the steel wires 4 and the axis of the composite pipe is equal.

The distance between the steel wire 4 and the inner side of the inner plastic layer 2 is greater than the distance from the outer side of the inner plastic layer 2 .

Embodiment two.

The steel mesh layer 5 is helically wound in the 26 layers of hot melt adhesive in a unidirectional right-handed direction, and the included angle between the steel wires of the steel mesh layer 5 and the axis is 55 degrees. Other structures are the same as in Embodiment 1.

Embodiment three.

The steel mesh layer 5 is helically wound in the 26 layers of hot melt adhesive in a unidirectional left-handed direction, and the included angle between the steel wires of the steel mesh layer 5 and the axis is 88 degrees. Other structures are the same as in Embodiment 1.

Embodiment four.

The steel mesh layer 5 is helically wound in two layers of hot-melt adhesive in two-way left-handed and right-handed directions, and the included angle between the steel wires of the steel mesh layer 5 and the axis is 5 degrees. Other structures are the same as in Embodiment 1.

Embodiment five.

The steel mesh layer 5 is helically wound in two layers of hot-melt adhesive in two-way left-handed and right-handed directions, and the included angle between the steel wires of the steel mesh layer 5 and the axis is 55 degrees. Other structures are the same as in Embodiment 1.

Embodiment six.

The steel mesh layer 5 is helically wound in two layers of hot-melt adhesive in two-way left-handed and right-handed directions, and the included angle between the steel wires of the steel mesh layer 5 and the axis is 88 degrees. Other structures are the same as in Embodiment 1.

Embodiment seven.

As shown in Figures 3 and 4, a new type of steel mesh plastic composite pipe includes an outer plastic layer 1' and an inner plastic layer 2', and the outer plastic layer 1' is outside the inner plastic layer 2' A hot melt adhesive layer 5' is arranged between the outer plastic layer 1' and the inner plastic layer 2', and a steel wire mesh layer 3' and a steel wire layer 4 are arranged in the hot melt adhesive layer 5' ', the steel wire layer 4' is circularly distributed along the axial direction of the composite pipe, and is located in the hot melt adhesive layer 5' close to the inner plastic layer 2', and the steel wire mesh layer 3' is located in the hot melt adhesive layer 5' and close to the position of the outer plastic layer 1'. The steel mesh layer 3' is helically wound in the hot melt adhesive layer 5' in one-way left-handed or one-way right-handed or two-way left-handed and right-handed directions, and the angle between the steel wire of the steel mesh layer 3' and the axis of the composite pipe is It is greater than 54 degrees and less than 88 degrees.

Embodiment eight.

The steel mesh layer 3' is helically wound in the hot melt adhesive layer 5' in a unidirectional left-handed direction, and the angle between the steel wire of the steel mesh layer 3' and the axis of the composite pipe is 72 degrees. The outer surfaces of the steel wire layer 4' and the steel wire mesh layer 3' are embossed with patterns, the inner wall of the inner plastic layer 2' is provided with a functional layer 6', and each steel wire of the steel wire layer 4' is combined with The distance from the pipe axis is equal. Other structures are the same as in Embodiment 7.

Embodiment nine.

The steel mesh layer 3' is helically wound in the hot melt adhesive layer 5' in a unidirectional left-handed direction, and the included angle between the steel wires of the steel mesh layer 3' and the axis of the composite pipe is 88 degrees. The outer surfaces of the steel wire layer 4' and the steel wire mesh layer 3' are embossed with patterns, the inner wall of the inner plastic layer 2' is provided with a functional layer 6', and each steel wire of the steel wire layer 4' is combined with The distance from the pipe axis is equal. Other structures are the same as in Embodiment 7.

Embodiment ten.

The steel mesh layer 3' is helically wound in the hot melt adhesive layer 5' in a unidirectional right-handed direction, and the angle between the steel wire of the steel mesh layer 3' and the axis of the composite pipe is 54 degrees. The outer surfaces of the steel wire layer 4' and the steel wire mesh layer 3' are embossed with patterns, the inner wall of the inner plastic layer 2' is provided with a functional layer 6', and each steel wire of the steel wire layer 4' is combined with The distance from the pipe axis is equal. Other structures are the same as in Embodiment 7.

Embodiment eleven.

The steel mesh layer 3' is helically wound in the hot melt adhesive layer 5' in a unidirectional right-handed direction, and the angle between the steel wire of the steel mesh layer 3' and the axis of the composite pipe is 72 degrees. The outer surfaces of the steel wire layer 4' and the steel wire mesh layer 3' are embossed with patterns, the inner wall of the inner plastic layer 2' is provided with a functional layer 6', and each steel wire of the steel wire layer 4' is combined with The distance from the pipe axis is equal. Other structures are the same as in Embodiment 7.

Embodiment twelve.

The steel mesh layer 3' is helically wound in the hot melt adhesive layer 5' in a unidirectional left-handed direction, and the included angle between the steel wires of the steel mesh layer 3' and the axis of the composite pipe is 88 degrees. The outer surfaces of the steel wire layer 4' and the steel wire mesh layer 3' are embossed with patterns, the inner wall of the inner plastic layer 2' is provided with a functional layer 6', and each steel wire of the steel wire layer 4' is combined with The distance from the pipe axis is equal. Other structures are the same as in Embodiment 7.

Embodiment thirteen.

The steel mesh layer 3' is helically wound in the hot melt adhesive layer 5' in a bidirectional left-handed and right-handed direction, and the angle between the steel wires of the steel mesh layer 3' and the axis of the composite pipe is 54 degrees. The outer surfaces of the steel wire layer 4' and the steel wire mesh layer 3' are embossed with patterns, the inner wall of the inner plastic layer 2' is provided with a functional layer 6', and each steel wire of the steel wire layer 4' is combined with The distance from the pipe axis is equal. Other structures are the same as in Embodiment 7.

Embodiment Fourteen.

The steel mesh layer 3' is helically wound in the hot melt adhesive layer 5' in a bidirectional left-handed and right-handed direction, and the angle between the steel wires of the steel mesh layer 3' and the axis of the composite pipe is 72 degrees. The outer surfaces of the steel wire layer 4' and the steel wire mesh layer 3' are embossed with patterns, the inner wall of the inner plastic layer 2' is provided with a functional layer 6', and each steel wire of the steel wire layer 4' is combined with The distance from the pipe axis is equal. Other structures are the same as in Embodiment 7.

Embodiment fifteen.

The steel mesh layer 3' is helically wound in the hot melt adhesive layer 5' in a bidirectional left-handed and right-handed direction, and the angle between the steel wires of the steel mesh layer 3' and the axis of the composite pipe is 88 degrees. The outer surfaces of the steel wire layer 4' and the steel wire mesh layer 3' are embossed with patterns, the inner wall of the inner plastic layer 2' is provided with a functional layer 6', and each steel wire of the steel wire layer 4' is combined with The distance from the pipe axis is equal. Other structures are the same as in Embodiment 7.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a kind of new steel mesh plastic composite pipe, including outer layer plastic layer (1) and inner plastic layer (2), the outer layer plastic layer (1) it is in outside inner plastic layer (2), it is characterised in that：The inner plastic layer (2) is rounded along multiple tube axial direction Even distribution is provided with wire (4), and one layer of hot melt adhesive one (3), the outer layer plastic layer are covered with wire (4) surface （1）One layer of hot melt adhesive two (6) is provided between inner plastic layer (2), steel screen layer is provided with described two (6) layer of hot melt adhesive (5)。

A kind of 2. new steel mesh plastic composite pipe according to claim 1, it is characterised in that：The steel screen layer (5) is in Unidirectional left-handed or unidirectional clockwise direction is spirally wound on hot melt adhesive two（6）In layer, the steel screen layer（5）Steel wire and axis press from both sides Angle is to be less than 90 degree more than 0 degree.

A kind of 3. new steel mesh plastic composite pipe according to claim 1, it is characterised in that：The steel screen layer (5) is in Two-way left-handed and clockwise direction is spirally wound on hot melt adhesive two（6）In layer, the steel screen layer（5）Steel wire be with axis angle It is less than 90 degree more than 0 degree.

A kind of 4. new steel mesh plastic composite pipe according to claim 1, it is characterised in that：The wire（4）And steel Silk screen layer（5）Outer surface be pressed with decorative pattern, the inner plastic layer（2）Functional layer is provided with madial wall（7）.

A kind of 5. new steel mesh plastic composite pipe according to claim 1, it is characterised in that：The wire（4）Distance Inner plastic layer（2）The distance of inner side is more than it apart from inner plastic layer（2）The distance in outside.

A kind of 6. new steel mesh plastic composite pipe according to Claims 2 or 3, it is characterised in that：The steel screen layer（5） Steel wire and axis angle be less than 88 degree more than 54 degree.

7. a kind of new steel mesh plastic composite pipe, including outer layer plastic layer (1 ') and inner plastic layer (2 '), the outer layer plastic Layer (1 ') is in outside inner plastic layer (2 '), it is characterised in that：The outer layer plastic layer（1’）With inner plastic layer (2 ') it Between be provided with one layer of hot melt adhesive layer (5 '), be provided with steel screen layer (3 ') and wire layer in hot melt adhesive layer (the 5 ') layer （4’）, the wire layer（4’）It is uniformly distributed along multiple tube axial direction is rounded, close to interior in hot melt adhesive layer (5 ') The position of layer plastic layer (2 '), the steel screen layer (3 ') are in hot melt adhesive layer (5 ') close to outer layer plastic layer (1 ') Position.

A kind of 8. new steel mesh plastic composite pipe according to claim 7, it is characterised in that：The steel screen layer (3 ') is in Unidirectional left-handed or unidirectional clockwise direction is spirally wound on hot melt adhesive layer（5’）It is interior, the steel screen layer（3’）Steel wire and multiple tube Axis angle is to be less than 88 degree more than 54 degree.

A kind of 9. new steel mesh plastic composite pipe according to claim 7, it is characterised in that：The steel screen layer (3 ') is in Two-way left-handed and clockwise direction is spirally wound on hot melt adhesive layer（5’）It is interior, the steel screen layer（3’）Steel wire be with axis angle It is less than 88 degree more than 54 degree.

A kind of 10. new steel mesh plastic composite pipe according to claim 7, it is characterised in that：The wire layer（4’） And steel screen layer（3’）Outer surface be pressed with decorative pattern, the inner plastic layer（2’）Functional layer is provided with madial wall（6’）, institute State wire layer（4’）Every steel wire is equal with the distance of multiple tube axial line.