CN116766650A - Composite pipe and manufacturing method thereof - Google Patents

Abstract

The invention discloses a composite pipe and a manufacturing method thereof, and relates to the technical field of composite pipes. It solves the problem that the ring stiffness, pressure-bearing capacity and structural stability of existing composite pipes cannot simultaneously meet the requirements, and improves production quality and production efficiency. The specific plan is as follows: it includes a polymer inner tube, a composite reinforcement layer, a polymer outer protective layer and a structural wall arranged in sequence from the inside to the outside. The polymer inner tube is extruded, and the composite reinforcement layer is composed of several layers of reinforcement materials that are crossed and spiraled left and right. The composite reinforcement layer is fixedly connected to the polymer inner tube and the polymer outer sheath. The structural wall is spirally wound and fixed on the polymer outer sheath to increase the ring stiffness of the pipe. The structural wall is a tubular structure.

Description

Composite pipe and production method thereof

Technical field

The present invention relates to the technical field of composite pipes, and in particular to a composite pipe and a manufacturing method thereof.

Background technique

Composite pipes currently on the market, for example: steel mesh skeleton reinforced polyethylene composite pipes, the largest model on the market is dn1200. When the product diameter is too large, the cost of production equipment is high, and the pipe ring stiffness is low. To increase the ring stiffness, the pipe wall thickness needs to be increased. , will cause high production costs. Therefore, PCCP or ductile iron pipes are often used in the market. However, long-term use of such products can easily cause water pollution. At the same time, the product life is short and the overall cost of use is high. Although high-density polyethylene (HDPE) winding structural wall pipes meet the requirements of ring stiffness, the pipes have low pressure-bearing capacity and narrow application range, and the sheet-wound method of the inner pipes can easily lead to poor bonding between pipe layers and inner walls containing Defects such as pores require high precision in production process control. At the same time, the cooling time of the pipe is too long, the product is produced discontinuously, and the production capacity is low.

Contents of the invention

In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a composite pipe and a manufacturing method thereof. A composite reinforcement layer is provided on the outside of the polymer inner pipe to improve the overall strength of the pipe and reduce the impact of large-diameter plastics under the same pressure. The wall thickness of the pipe is increased, and a tubular structural wall is wrapped around the polymer outer sheath to improve the ring stiffness of large-diameter plastic pipes, solving the problem that the ring stiffness, pressure-bearing capacity and structural stability of existing composite pipes cannot simultaneously meet the requirements. The problem.

In order to achieve the above objects, the present invention is achieved through the following technical solutions:

In a first aspect, the present invention provides a composite pipe, including a polymer inner tube, a composite reinforcement layer, a polymer outer protective layer and a structural wall arranged sequentially from the inside to the outside. The polymer inner tube is extruded and the composite reinforcement is The layer is composed of several layers of reinforcing materials crossed and spirally wound on the left and right. The composite reinforcing layer is fixedly connected to the polymer inner tube and the polymer outer sheath. The structural wall is spirally wound and fixed on the polymer outer sheath to increase the ring stiffness of the pipe. , the structural wall is a tubular structure.

As a further implementation method, the polymer inner tube is extruded separately from polyethylene material.

As a further implementation method, the composite reinforcement layer, the polymer inner tube, and the polymer outer sheath are all fixedly connected through adhesive materials.

As a further implementation, the reinforcing material may be any one or a combination of glass fiber tapes, carbon fiber tapes, steel chain rope tapes, steel wire tapes and other materials.

As a further implementation, the winding angle of the reinforcing material is 45°-75°.

In a second aspect, the present invention provides a method for manufacturing composite pipes, specifically as follows:

The polymer inner tube is separately produced, cooled, shaped and cut;

Support the interior of the polymer inner tube and place the supported polymer inner tube on the conveyor line for spiral conveyance;

The polymer inner tube on the conveyor line is heated and several layers of reinforcing materials are criss-crossed and spirally wound on its surface;

After the reinforcement material is wrapped, the polymer outer sheath is wrapped, and the structural wall is wrapped around the polymer outer sheath;

Remove the inner support of the pipe and perform cooling, cutting and joint processing of the pipe.

As a further implementation, the conveyor line is a rotating supporting wheel structure with a set angle, which is arranged by several rotating supporting wheel groups, and each rotating supporting wheel group contains two opposite rotating supporting wheels.

As a further implementation method, the reinforcing material needs to be heated before winding, and the reinforcing material is soaked with a bonding material before compounding.

As a further implementation method, the polyethylene sheet is compacted by using rollers under the pipe during the winding process of the polyethylene sheet.

As a further implementation, the winding process of the structural wall and the winding process of the composite reinforcement layer are performed simultaneously.

The above-mentioned beneficial effects of the present invention are as follows:

(1) The polymer inner tube of the present invention is extruded to avoid problems such as poor interlayer bonding and inner wall pores caused by poor winding process control. A composite reinforcement layer is provided on the outside of the polymer inner tube to improve the overall strength of the pipe. The wall thickness of large-diameter plastic pipes under the same pressure is reduced, and a tubular structural wall is wrapped around the polymer outer sheath, which increases the ring stiffness of large-diameter plastic pipes and improves the production quality of composite pipes.

(2) The polymer inner tube of the present invention is independently extruded. The composite work of the polymer inner tube and the production of the polymer inner tube do not affect each other, which greatly ensures the continuity of pipe production and improves production efficiency.

(3) The advance infiltration treatment of the reinforcement material of the present invention eliminates the need to coat the surface of the polymer inner tube with bonding material during the winding process, which not only improves production efficiency, but also ensures that the bonding material on both sides of the composite reinforcement layer is guaranteed coating uniformity.

(4) During the winding process of the polyethylene sheet, the present invention uses the roller below the pipe to compact the polyethylene sheet, so that the polyethylene sheet and the composite reinforcement layer are closely connected, ensuring a tight connection between the pipe layers. properties, avoiding the occurrence of pores on the inner wall.

(5) The winding process of the structural wall of the present invention is carried out simultaneously with the winding process of the composite reinforcement layer. There is no need to preheat the composite reinforcement layer or the structural wall, which simplifies the production steps, reduces the production time, and greatly improves the production efficiency.

Description of drawings

The description and drawings that constitute a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

Figure 1 is a schematic structural diagram of a composite pipe according to one or more embodiments of the present invention;

In the figure: the distance or size between each part is exaggerated to show the position of each part, and the schematic diagram is for illustrative purposes only;

Among them, 1. Polymer inner tube; 2. Bonding material; 3. Composite reinforcement layer; 4. Polymer outer protective layer; 5. Structural wall.

Detailed ways

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meanings commonly understood by one of ordinary skill in the art to which this invention belongs.

As introduced in the background technology, the largest model of steel mesh skeleton reinforced polyethylene composite pipe on the market is dn1200. When the product diameter is too large, the production equipment cost is high and the pipe ring stiffness is low. If the ring stiffness is increased, the pipe wall thickness needs to be increased, resulting in production high cost. Although high-density polyethylene (HDPE) winding structural wall pipes meet the requirements of ring stiffness, the pipes have low pressure-bearing capacity and narrow application range, and the sheet-wound method of the inner pipes can easily lead to poor bonding between pipe layers and inner walls containing Defects such as pores, long pipe cooling time, discontinuous production of products, and low production capacity. In order to solve the above technical problems, the present invention proposes a composite pipe and a manufacturing method thereof.

Example 1

In a typical implementation of the present invention, as shown in Figure 1, a composite pipe is proposed, including a polymer inner tube 1, a composite reinforcement layer 3, a polymer outer protective layer 4 and a structure arranged sequentially from the inside to the outside. Wall 5.

The composite reinforcing layer 3 is fixedly connected to the polymer inner tube 1 and the polymer outer sheath 4 on both its inner and outer sides through an adhesive material 2 .

The polymer inner tube 1 is formed by melting and extruding polyethylene particles and pulling and cutting. It is used to transport fluids. The polymer inner tube 1 is extruded separately to avoid poor interlayer bonding and inner wall pores caused by poor winding process control. At the same time, it can effectively avoid the problem of low production efficiency caused by long pipe cooling time.

The composite reinforcement layer 3 is composed of several layers of reinforcement materials that are crossed and spirally wound on the left and right. The reinforcement materials can be any one or more combinations of glass fiber tapes, carbon fiber tapes, steel chain rope tapes, steel wire tapes and other materials. The winding angle is 45°. -75°.

The setting of the composite reinforcement layer 3 greatly reduces the wall thickness of large-diameter plastic pipes under the same pressure, thereby reducing material costs and production costs.

It can be understood that the specific number of layers of the composite reinforcement layer 3 is determined according to actual design requirements, and there are no excessive restrictions here.

The polymer outer protective layer 4 is wound by polyethylene sheets extruded by an extruder, and the polymer outer protective layer 4 is wrapped around the outside of the composite reinforcement layer 3 .

A structural wall 5 is wound and fixed on the outside of the polymer outer sheath 4. The structural wall 5 is mainly used as a reinforcing rib to improve the ring stiffness of the large-diameter plastic pipe. The structural wall 5 is a tubular structure. The structural wall 5 is along the outer wall of the pipe (i.e., the polymer outer wall). The protective layer 4) is spirally wound. In this embodiment, the structural wall 5 is made of polyethylene material.

The arrangement of the structural wall 5 greatly improves the ring stiffness of the large-diameter plastic pipe and effectively prevents the deformation of the pipe.

It can be understood that the structural wall 5 can also be a multi-layered tubular structure. In this case, the material of each layer is different. The material of each layer can be any one of polypropylene, polyethylene and other materials. In other embodiments, the structure The wall 5 can also be other structures, and the specific structure type is not subject to excessive restrictions as long as it can ensure its ability to increase the stiffness of the large-diameter plastic pipe ring.

Example 2

In a typical implementation of the present invention, a method for manufacturing the composite pipe described in Embodiment 1 is proposed, specifically as follows:

First, prepare the polymer inner tube 1:

The polymer inner pipe 1 is produced separately using a conventional PE pipe production line. Specifically, the raw materials are mixed and dried, polyethylene particles are melted and extruded, and then entered into a vacuum sizing box for cooling and shaping;

The cooled and formed pipe is pulled by a tractor and cut to a specified length to obtain a polymer inner tube 1 of a set size.

Since the polymer inner tube 1 is extruded and produced independently, the composite work of the cut polymer inner tube 1 and the production of the polymer inner tube 1 do not affect each other, which ensures the continuity of pipe production and improves production efficiency.

Support the interior of the polymer inner tube 1, and place the polymer inner tube 1 containing the internal support on the conveyor line. The conveyor line is a rotating supporting wheel structure with a set angle, which can drive the polymer inner tube 1 to rotate around its axis. and move to realize the spiral transmission of the polymer inner tube 1;

Specifically, an inner support device is installed inside the cut polymer inner tube 1. The inner support device can ensure that the polymer inner tube 1 will not be deformed during transportation and winding. The tube 1 is placed on the conveying line so that the axial direction of the polymer inner tube 1 is the same as the axial direction of the rotating supporting wheel.

Among them, the conveyor line is arranged by several rotating supporting roller groups. Each rotating supporting roller group contains two rotating supporting rollers arranged oppositely. The two rotating supporting rollers have the same axial direction and the axial direction is the same as the conveying direction. The two rotating supporting rollers The polymer inner tube 1 is placed between the supporting wheels, and several rotating supporting wheel groups are arranged at intervals along the conveying direction.

It can be understood that the inner support device can be a telescopic support frame structure or a support mold structure with the same outer diameter as the inner diameter of the polymer inner tube 1. The inner support device can be selected according to actual needs.

The polymer inner tube 1 containing the internal support device is heated, and several layers of reinforcing materials are cross-helically wound left and right on the outer surface of the polymer inner tube 1 to finally form a composite reinforcement layer on the outer wall of the polymer inner tube 1 3.

Among them, the reinforcing material needs to be heated before winding, and the reinforcing material is processed by infiltration, that is, the reinforcing material is infiltrated into the bonding material 2 so that the surface of the reinforcing material contains the bonding material 2 before compounding.

The advance infiltration treatment of the reinforcement material eliminates the need to coat the surface of the polymer inner tube 1 with the bonding material 2 during the winding process, which not only improves production efficiency, but also ensures the bonding material 2 on both sides of the composite reinforcement layer 3 Coating uniformity.

After the winding of the composite reinforcement layer 3 is completed, the polymer outer protective layer 4 is wound;

Specifically, an extruder is used to extrude the polyethylene sheet, and the polyethylene sheet is wound on the outer surface of the composite reinforcement layer 3. At the same time, the roller below the pipe is used during the winding process of the polyethylene sheet. The polyethylene sheet is compacted so that the polyethylene sheet and the composite reinforcement layer 3 are tightly connected, ensuring the tightness of the connection between the pipe layers and avoiding the generation of pores in the inner wall.

Wrap the structural wall 5 on the polymer outer sheath 4;

Specifically, the structural wall 5 is a tubular structure. The structural wall 5 is extruded through an extruder and passed through a vacuum cooling box for vacuum cooling and shaping. After cooling and shaping, the structural wall 5 is spirally wound around the polymer outer sheath under the action of a tractor. 4 for compounding.

Among them, the winding process of the structural wall 5 and the winding process of the composite reinforcement layer 3 are carried out simultaneously to ensure that the structural wall 5 and the composite reinforcement layer 3 are effectively connected together.

Since the composite reinforcement layer 3, the polymer outer sheath 4, and the structural wall 5 are all composited by rotating the pipe, the volume of the composite equipment can be effectively reduced, and the processing difficulty and use cost of the equipment are greatly reduced. The structural layers are all prepared independently, effectively ensuring the continuity of production.

After the winding of the structural wall 5 is completed, the pipe is cooled, cut and the joints are processed.

Specifically, spray cooling is used to cool the pipes, the inner support device is taken out, the joints are cut and processed according to the designed length, and finally the pipes that meet the requirements are obtained and inspected for storage.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a compound tubular product, its characterized in that includes from inside to outside polymer inner tube, compound enhancement layer, polymer outer sheath and the structural wall that sets gradually, polymer inner tube extrusion molding, compound enhancement layer are by a plurality of layers of reinforcing material left and right sides alternately spiral winding forms, compound enhancement layer and polymer inner tube, polymer outer sheath fixed connection, the structural wall spiral winding is fixed on the polymer outer sheath in order to increase the ring rigidity of tubular product, and the structural wall is tubular structure.

2. The composite tubing of claim 1 wherein said polymeric inner tube is extruded solely from polyethylene material.

3. The composite pipe according to claim 1, wherein the composite reinforcing layer is fixedly connected with the polymer inner pipe and the polymer outer protective layer through bonding materials.

4. The composite pipe according to claim 1, wherein the reinforcing material is any one or more of glass fiber tape, carbon fiber tape, steel strand tape, steel wire tape, etc.

5. A composite pipe according to claim 1, wherein the winding angle of the reinforcing material is 45 ° -75 °.

6. A method for manufacturing a composite pipe according to any one of claims 1 to 5, characterized by the following:

separately producing a polymer inner tube, cooling, shaping and cutting;

supporting the inside of the polymer inner tube and placing the supported polymer inner tube on a conveying line for spiral conveying;

heating the inner polymer tube on the conveying line and spirally winding a plurality of layers of reinforcing materials on the surface of the inner polymer tube in a left-right crossing manner;

winding the polymer outer protective layer after the reinforcing material is wound, and winding the structural wall on the polymer outer protective layer;

and removing the inner support of the pipe and cooling, cutting and joint processing the pipe.

7. The method of claim 6, wherein the conveyor line has a rotating roller structure with a predetermined angle, and is formed by arranging a plurality of rotating roller groups, each of which comprises two rotating rollers arranged opposite to each other.

8. The method of claim 6, wherein the reinforcing material is heated before being wound, and the reinforcing material is impregnated with the bonding material before being compounded.

9. The method of manufacturing a composite pipe according to claim 6, wherein the polyethylene sheet is compacted by a carrier roller under the pipe during the winding of the polyethylene sheet.

10. The method of claim 6, wherein the winding of the structural wall is performed simultaneously with the winding of the composite reinforcement layer.