CN216885109U

CN216885109U - Extrusion molding reinforced composite pipe and production device thereof

Info

Publication number: CN216885109U
Application number: CN202220056959.7U
Authority: CN
Inventors: 刘可岭; 牟其善
Original assignee: Shunfang Pipes Co ltd
Current assignee: Shunfang Pipes Co ltd
Priority date: 2022-01-11
Filing date: 2022-01-11
Publication date: 2022-07-05
Anticipated expiration: 2032-01-11

Abstract

An extrusion reinforced composite pipe and a production device thereof relate to the technical field of reinforced composite pipes, and the extrusion reinforced composite pipe comprises an inner pipe, wherein the inner pipe is processed and manufactured by a high molecular weight polyethylene mixture through an extrusion process; the extrusion reinforced composite pipe further comprises an outer reinforcement layer, wherein the outer reinforcement layer comprises at least one composite layer formed by a steel wire winding layer and an outer extrusion layer. The composite pipe has smooth medium flow operation, simple structure and convenient processing, and can flexibly adjust the composite pipe structure according to the engineering requirement.

Description

Extrusion molding reinforced composite pipe and production device thereof

Technical Field

The utility model relates to the technical field of reinforced composite pipes, in particular to an extrusion-molded reinforced composite pipe and a production device for processing the composite pipe.

Background

In the prior art, a water supply pipe and a water discharge pipe in the technical field of plastic steel pipes are generally spirally wound into pipes by plastic steel plates, and one critical defect of the steel plates wound around the plastic steel pipes is that winding grooves are inevitably formed in the inner parts of the pipes, and the grooves are approximately vertical to the flowing direction of a medium in the pipes, so the grooves obviously influence the running speed of the medium flow.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide an extrusion-reinforced composite pipe, wherein an inner pipe of the composite pipe is made of a high-molecular-weight polyethylene mixture by extrusion processing to obtain a smooth inner pipe wall and eliminate the influence of a groove on the inner wall of a plastic steel pipe on the running speed of a medium flow in the prior art, and the adopted technical scheme is as follows: an extrusion molding reinforced composite pipe, comprising an inner pipe, characterized in that: the inner pipe is made of a high molecular weight polyethylene mixture through an extrusion molding process; the extrusion molding reinforced composite pipe further comprises an outer reinforcing layer, wherein the outer reinforcing layer comprises at least one composite layer formed by a steel wire winding layer and an outer extrusion molding layer.

And in consideration of the requirements of pipe pressure bearing and ring stiffness, the steel wire used by the steel wire winding layer is a carbon spring steel wire.

The outer extrusion layer is made from a high molecular weight polyethylene blend by extrusion, taking into account material flexibility and scratch damage resistance requirements.

The steel wire winding layer on the inner pipe is wound by a single steel wire, and a small steel wire winding angle is combined to ensure that the steel wire bears the hoop pressure caused by the internal pressure of the pipe in the pipe wall to the maximum extent, so that the bearing capacity of the pipe is improved, and the outer enhancement layer comprises at least one layer of composite layer formed by the steel wire winding layer formed by the single steel wire and the outer extrusion layer.

The utility model also discloses a production device, which comprises an inner pipe extrusion part and a winding part, wherein the inner pipe processed by the inner pipe extrusion part is wound by steel wires to form a steel wire winding layer, and the production device is characterized in that: the apparatus for producing still includes outer extrusion molding part, outer extrusion molding part includes vice extruder, and the outer extrusion molding layer that vice extruder extrusion molding formed is compound to be formed on steel wire winding layer and inner tube the compound pipe of extrusion molding reinforcing.

The production device can process the extrusion molding reinforced composite pipe at one time, if the processing of a plurality of layers of composite layers is needed, only the winding device and the external extrusion molding device are correspondingly added at the back of the production line device with one layer of the external composite layer until a finished product with the number of layers of the composite layer meeting the requirement is obtained.

The main structure of the inner pipe extrusion part of the production device is as follows: the inner pipe extrusion part comprises a main motor, the main motor drives the main extruder, and the high molecular weight polyethylene mixture is extruded by a main die of the main extruder to form the inner pipe.

The winding part structure of the production device further comprises: the winding part comprises a winding motor, the power of the winding motor is transmitted to the steel wire coil, the steel wire coil rotates around the inner pipe on the support rail, and the steel wire of the steel wire coil is drawn out and wound to form a steel wire winding layer.

The utility model has the beneficial effects that: the composite pipe inner pipe is made of a high polymer polyethylene material through extrusion molding, and the inner wall surface is smooth; the small winding angle of a single steel wire is adopted for winding, so that the bearing capacity, flexibility, bendability, peeling strength and ring stiffness of the pipe are effectively improved; the composite pipe has smooth medium flow operation, simple structure and convenient processing, and can flexibly adjust the composite pipe structure according to the engineering requirement.

Drawings

FIG. 1 is a schematic diagram of an extrusion-reinforced composite pipe structure, FIG. 2 is a schematic diagram of a production apparatus of an extrusion-reinforced composite pipe, and FIG. 3 is a schematic diagram of a comparative "steel wire mesh reinforced polyethylene composite pipe for water supply".

1 is a main motor, 2 is a main extruder, 3 is a main die, 4 is an inner tube, 5 is a winding motor, 6 is a chain wheel, 7 is a steel wire coil, 8 is a bracket, 10 is an auxiliary motor, 11 is an auxiliary extruder, 12 is an auxiliary die, and 13 is a finished product;

21 is an inner tube, 22 is an outer reinforcement layer, 221 is a steel wire winding layer, 222 is an outer extrusion layer;

31 is a polyethylene inner layer, 32 is an adhesive resin layer, 33 is a steel wire mesh skeleton, and 34 is a polyethylene outer layer.

Detailed Description

The following describes a specific embodiment of the present invention with reference to the drawings.

The utility model discloses an extrusion molding reinforced composite pipe, which comprises an inner pipe 21 and an outer reinforced layer 22, wherein the inner pipe 21 is made of a high molecular weight polyethylene mixture through extrusion molding, and the outer reinforced layer 22 comprises at least one composite layer formed by a steel wire winding layer 221 and an outer extrusion molding layer 222. The number of layers of the composite layer is determined by the strength of the pipe required in the actual engineering.

In this embodiment, the outer extruded layer may also be made of a high molecular weight polyethylene mixture by an extrusion process, and the steel wire used for the steel wire winding layer 221 is a carbon spring steel wire.

The extrusion molding reinforced composite pipe has the advantages that:

1) the steel wire is adopted to form the steel wire winding layer, and particularly, a single steel wire is adopted to form the steel wire winding layer, so that the steel wire has the minimum winding inclination angle (namely the included angle between the winding direction of the steel wire and the cross section of the pipe, and the winding inclination angle is close to 0 degree in the utility model), the steel wire is ensured to bear the annular pressure formed by the internal pressure of the pipe in the pipe wall to the maximum extent, and the pressure bearing capacity of the pipe is improved.

2) The inner pipe 21 is made of high molecular weight polyethylene, has strong flexibility, can bear the strangle pressure of a steel wire, and does not cause the notch of the surface layer of the pipe wall. And along with the increase of the diameter of the steel wire, the inner tube bears the increase of tensile force, and the interval between the steel wires can be increased along with the increase of the inner tube, so that the upper and lower adjacent extrusion molding layers are combined together through the heat of the steel wire gaps, and the integrity of the composite pipe is improved.

3) The steel wire is wound around the inner pipe in one direction to form a structure like a spring, so that the longitudinal flexibility and the flexibility of the pipe can be guaranteed, the pipe mounting engineering is greatly facilitated, meanwhile, stress concentration can be avoided, and the capability of resisting crustal settlement of the pipe is guaranteed.

4) The carbon spring steel wire has high elastic modulus which is more than 4 times that of a common steel wire, and more than thousand times that of polyethylene plastics, and the ring stiffness of the pipe is in direct proportion to the elastic modulus of the pipe wall material, so that the ring stiffness of the pipe can be directly increased; particularly, the steel wires can be wound and distributed in multiple layers according to requirements, the space interval and the plastic support are quite large among the layers, the wall thickness of the pipe is remarkably increased, and the annular rigidity of the pipe is in direct proportion to the 3 rd power of the wall thickness of the pipe, so that the annular rigidity of the pipe is greatly increased.

Compared with the common steel wire mesh reinforced polyethylene composite pipe in the market, the technical scheme provided by the utility model also has obvious advantages, and the advantages are as follows:

taking a steel wire mesh reinforced polyethylene composite pipe for water supply (the pipe adopts the standard GB/T32439-2015) as an example, the structure of the pipeline is shown in FIG. 3, and the comparative analysis of the two is as follows:

1) bearing capacity

The steel wire mesh reinforced polyethylene composite pipe has poor impact strength and rapid cracking resistance of a base material polyethylene, is compounded with steel wires, namely, a notch is formed in the base material, the polyethylene composite pipe is very weak to impact and is smashed by a hammer, so that the steel wires need to be wound in a cross mode or in a net mode, the steel wires cannot be too thick, a bearing layer of the steel wire mesh reinforced polyethylene composite pipe only can be formed by weaving a layer of common thin steel wires, the tensile strength of the steel wires is only about 300MPa, the winding angle of the steel wires is large and ranges from 54.7 degrees to 60 degrees, the steel wire mesh has poor hoop stress resistance, the pressure bearing capacity of the pipe is limited, and the maximum pressure level of the pipe with a larger pipe diameter is only 1.0 MPa.

The composite pipe material has good substrate texture and strong flexibility, can be compounded with strong steel wires, has the tensile strength of 2000MPa which is 7 times that of the steel wires made of common steel, has the elastic modulus of 900GPa which is 4.5 times that of the steel wires made of common steel, and has high strength and thin wall thickness. Meanwhile, a single steel wire is wound in one direction, the inclination angle is small, the capability of bearing hoop stress is strong, and the pressure bearing capacity of the pipe is greatly increased.

2) Flexibility of the material

The steel wire mesh reinforced polyethylene composite pipe has the advantages that the steel wires are wound in a single direction, the longitudinal flexibility of the pipe can be still kept, the pipe can have certain flexibility, and the steel wire mesh reinforced polyethylene composite pipe has great superiority in engineering laying and stratum settlement resistance.

3) Peel strength

The crossed steel wires of the steel wire mesh reinforced polyethylene composite pipe are distributed in a plane, so that an upper polyethylene layer and a lower polyethylene layer are cut apart, and the plastic and steel layering phenomenon is easily caused. The delamination of the pipe is inevitable in terms of material and structure, and particularly, the pressure in the pipe is often pulsating, and delamination is more likely to occur. The peeling strength of the pipe is poor, the integrity and the safety of the pipe are greatly reduced, and once a polyethylene layer cracks, water enters a steel wire layer, the steel wire layer can be corroded quickly, so that the pressure bearing capacity of the pipe is reduced sharply, and even the result of pipe explosion is caused, and the pipe is very dangerous.

The steel wires are wound in a single direction, the space between the steel wires is large, the steel wires are surrounded by the polyethylene materials at the upper, lower, left and right sides, the steel wires are like radial steel wires in automobile tires, the steel wires cannot crack and separate no matter how the radial steel wires are extruded and impacted, the steel wires have extremely high peel strength which is more than 4 times of that of a steel wire mesh reinforced polyethylene composite pipe, and the most important characteristic-integrity of the composite pipe is reliably ensured.

4) Rigidity of ring

The steel wire layers of the steel wire mesh reinforced polyethylene pipe are distributed in a thin layer, compared with the pipe provided by the utility model, the pipe has much lower ring rigidity, large deformation when being buried underground, and influences the transportation of the pipeline and the service life of the pipeline. If the ring stiffness of the pipeline is required to be increased, the ring stiffness can only be increased by adopting a mode of enhancing the wall thickness of a polyethylene layer of the pipe, so that the cost is increased.

The composite pipe provided by the utility model adopts the carbon spring steel wire as the steel wire, has extremely high elastic modulus, can be in multi-layer three-dimensional distribution, has obvious space intervals and plastic supports between the steel wire layers, is equivalent to the strength of the steel wire, and obviously increases the wall thickness of the pipe, thereby greatly increasing the ring stiffness of the pipe.

The steel wire has high elastic modulus, so that the pipe is not easy to deform under external force, and the pipe can rebound to the original shape once the external force is removed after deformation, which is also a characteristic that common pipes, especially plastic pipes, do not have.

The utility model also discloses a production device for processing the extrusion molding reinforced composite pipe, which comprises an inner pipe extrusion part and a winding part, wherein the winding part comprises a steel wire winding pipe 9, the inner pipe 4 processed by extrusion molding of the inner pipe extrusion part is wound by steel wires to form a steel wire winding layer 221, and the steel wires are drawn out from a steel wire coil 7. The production device further comprises an outer extrusion molding part, the outer extrusion molding part comprises an auxiliary extruder 11, and an outer extrusion molding layer 222 formed by extrusion molding of the auxiliary extruder 11 is compounded on the steel wire winding layer 221 and the inner pipe 21 to form an extrusion molding reinforced composite pipe.

The inner pipe extrusion part comprises a main motor 1, the main motor 1 drives a main extruder 2, and a high molecular weight polyethylene mixture is extruded through a main die 3 of the main extruder 2 to form an inner pipe 21.

The winding part further comprises a winding motor 5, the power of the winding motor 5 is transmitted to the wire coil 7, and the wire coil 7 is mounted on the bracket 8 to rotate around the inner tube 21, and specifically, the wire coil rotates around the inner tube 21 on the bracket rail.

It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and that various changes, modifications, additions and substitutions which are within the spirit and scope of the present invention and which may be made by those skilled in the art are also within the scope of the present invention.

Claims

1. An extrusion molding reinforced composite pipe, comprising an inner pipe, characterized in that: the inner pipe is made of a high molecular weight polyethylene mixture through an extrusion molding process; the extrusion molding reinforced composite pipe further comprises an outer reinforcing layer, wherein the outer reinforcing layer comprises at least one composite layer formed by a steel wire winding layer and an outer extrusion molding layer.

2. An extrusion reinforced composite tube according to claim 1, wherein: the steel wire used in the steel wire winding layer is a carbon spring steel wire.

3. An extrusion reinforced composite tube according to claim 1, wherein: the outer extrusion layer is made of a high molecular weight polyethylene mixture by extrusion processing.

4. An extrusion reinforced composite tube according to any one of claims 1 to 3, wherein: the outer enhancement layer comprises at least one layer of composite layer formed by a steel wire winding layer wound by a single steel wire and an outer extrusion layer.