Laser welding nonmetal composite pipe and manufacturing method thereof

Abstract

The invention belongs to the technical field of nonmetal composite pipes, and particularly relates to a laser welding nonmetal composite pipe and a manufacturing method thereof. The laser welding nonmetal composite pipe comprises a lining pipe, a reinforcing layer and an outer protection pipe, the reinforcing layer is arranged on the outer wall of the lining pipe, the outer protection pipe is arranged on the outer wall of the reinforcing layer, the lining pipe and the reinforcing layer are connected through laser welding, and the reinforcing layer and the outer protection pipe are connected through laser welding. The high polymer material composite pipe is welded through laser, so that the lining pipe and the reinforcing layer as well as the reinforcing layer and the outer protection pipe are directly welded, no adhesive exists, the performance weak points of the composite pipe are reduced, the welding performance strength and the high sealing performance are good, and the high temperature resistance, the tensile strength and other performance of the composite pipe can be greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of non-metallic composite pipes, and particularly relates to a laser-welded non-metallic composite pipe and a manufacturing method thereof. Background Art

[0002] At present, non-metallic pipes have been involved in all aspects of our lives. As the most economical and safest transportation method, pipeline transportation has been widely used in the civilian field, energy field, and aerospace field. However, the performance of a single polymer material sometimes cannot meet the requirements of the use conditions. For example, in the oil field, higher temperature resistance and high pipe body strength are required, so several polymer materials need to be compounded together. The inner layer contacts the medium to provide temperature resistance, the middle layer provides strength, and the outer layer provides protection performance, etc. This requires compounding polymer materials of different materials together.

[0003] At present, the more common compounding method of non-metallic composite pipes in industrialization is the multi-layer co-extrusion process. This method requires adding an adhesive between two polymer materials of different materials to achieve compounding. The process is complex, the mold is complex, and the cost is high. Moreover, if the composite pipe uses an adhesive, the adhesive layer is the weakest point in its performance during use. Generally, the adhesive cannot withstand high temperatures. After it ages, the pipe will face the risk of failure. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide a laser-welded non-metallic composite pipe and a manufacturing method thereof. By laser-welding a polymer material composite pipe, the two polymer materials are directly welded without an adhesive, reducing the weak points of the composite pipe's performance, and having high welding strength and good sealing performance, which can greatly improve the performance of the composite pipe such as high temperature resistance and tensile strength.

[0005] The technical solution of the present invention is as follows: A laser-welded non-metallic composite pipe includes an inner lining pipe, a reinforcing layer, and an outer protection pipe. The outer wall of the inner lining pipe is provided with a reinforcing layer, and the outer wall of the reinforcing layer is provided with an outer protection pipe. The inner lining pipe and the reinforcing layer, and the reinforcing layer and the outer protection pipe are connected by laser welding.

[0006] The wall thickness of the inner lining pipe is 2 - 5 mm, and the material of the inner lining pipe is one of polyolefin, polyketone resin, or polyamide resin.

[0007] The reinforcing layer is 3 - 10 mm, and the material of the reinforcing layer is one of polyolefin, polyketone resin, or polyamide resin.

[0008] The thickness of the outer protection pipe is 3 - 5 mm, and the material of the outer protection pipe is one of polyolefin, polyester, polyketone resin, or polyamide resin.

[0009] A manufacturing method of a laser-welded non-metallic composite pipe, comprising the following steps: S1: Extrude the inner liner pipe through a first extruder. After being shaped by a first cooling water tank, it passes through a second extruder. Then, the second extruder extrudes the reinforcing layer, which is vacuum-coated on the inner liner pipe and then cooled and shaped by a second cooling water tank; S2: Use a first laser welder to weld the inner liner pipe and the reinforcing layer outside the reinforcing layer; S3: After the welding of the inner liner pipe and the reinforcing layer is completed, extrude and form an outer protective pipe through a third extruder, which is vacuum-coated on the outside of the welded inner liner pipe and the reinforcing layer. After being cooled by a third cooling water tank, use a second laser welder to weld the outer protective pipe, and finally form a non-metallic composite pipe.

[0010] In the step S2, when using the first laser welder to weld the inner liner pipe and the reinforcing layer outside the reinforcing layer, the specific process is as follows: At a position 3 - 5 cm away from the circumferential surface of the outside of the reinforcing layer, arrange the first laser welder circumferentially along the reinforcing layer. The laser range completely covers the circumferential perimeter of the inner liner pipe. The welding speed is set to 0.5 - 1 m / min, and the power of the laser welder is set to 200 - 300 W. When the inner liner pipe and the reinforcing layer pass through the first laser welder, turn on the first laser welder for welding, so that the laser penetrates the reinforcing layer to reach the outer surface of the inner liner pipe, and the melting occurs at the joint between the outer surface of the inner liner pipe and the inner surface of the reinforcing layer, welding the inner liner pipe and the reinforcing layer into one body.

[0011] During the process of using the first laser welder to weld the inner liner pipe and the reinforcing layer outside the reinforcing layer, apply a circumferential pressure of 1 - 3 Kg to the outside of the reinforcing layer at the same time, so that the inner liner pipe and the reinforcing layer are welded into one body.

[0012] In the step S3, when using the second laser welder to weld the reinforcing layer and the outer protective pipe outside the outer protective pipe, the specific process is as follows: At a position 3 - 5 cm away from the circumferential surface of the outside of the outer protective pipe, arrange the second laser welder circumferentially along the outer protective pipe. The laser range completely covers the circumferential perimeter of the reinforcing layer. The welding speed is set to 0.5 - 1 m / min, and the power of the laser welder is set to 300 - 500 W. When the inner liner pipe, the reinforcing layer, and the outer protective pipe pass through the second laser welder, turn on the second laser welder for welding, so that the laser penetrates the outer protective pipe to reach the outer surface of the reinforcing layer, and the melting occurs at the joint between the outer surface of the reinforcing layer and the inner surface of the outer protective pipe, welding the reinforcing layer and the outer protective pipe into one body, and finally forming a non-metallic composite pipe.

[0013] During the process of using the second laser welder to weld the reinforcing layer and the outer protective pipe outside the outer protective pipe in the step S3, apply a circumferential pressure of 1 - 3 Kg to the outside of the outer protective pipe at the same time, so that the reinforcing layer and the outer protective pipe are welded into one body.

[0014] The technical effect of the present invention is as follows: By laser welding the polymer material composite pipe, the inner lining pipe and the reinforcing layer, and the reinforcing layer and the outer protection pipe are directly welded without adhesives, reducing the weak points of the performance of the composite pipe. Moreover, the welding performance has high strength and good sealing performance, which can greatly improve the performance of the composite pipe such as high temperature resistance and tensile strength.

[0015] The following will be further described in conjunction with the accompanying drawings. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of a laser-welded non-metallic composite pipe according to an embodiment of the present invention.

[0017] Figure 2 It is a schematic manufacturing process diagram of a laser-welded non-metallic composite pipe according to an embodiment of the present invention.

[0018] Reference numerals: 1 - inner lining pipe, 2 - reinforcing layer, 3 - outer protection pipe, 4 - first extruder, 5 - second extruder, 6 - first laser welder, 7 - third extruder, 8 - first cooling water tank, 9 - second cooling water tank, 10 - third cooling water tank, 11 - second laser welder. Detailed Embodiments Embodiment 1

[0019] As Figure 1 shown, a laser-welded non-metallic composite pipe includes an inner lining pipe 1, a reinforcing layer 2 and an outer protection pipe 3. The outer wall of the inner lining pipe 1 is provided with a reinforcing layer 2, and the outer wall of the reinforcing layer 2 is provided with an outer protection pipe 3. The inner lining pipe 1 and the reinforcing layer 2, and the reinforcing layer 2 and the outer protection pipe 3 are connected by laser welding.

[0020] The wall thickness of the inner lining pipe 1 is 2 - 5 mm, and the material of the inner lining pipe 1 is one of polyolefin, polyketone resin or polyamide resin.

[0021] The reinforcing layer 2 is 3 - 10 mm, and the material of the reinforcing layer 2 is one of polyolefin, polyketone resin or polyamide resin.

[0022] The thickness of the outer protection pipe 3 is 3 - 5 mm, and the material of the outer protection pipe 3 is one of polyolefin, polyester, polyketone resin or polyamide resin.

[0023] By laser welding the polymer material composite pipe, the inner lining pipe and the reinforcing layer, and the reinforcing layer and the outer protection pipe are directly welded without adhesives, reducing the weak points of the performance of the composite pipe. Moreover, the welding performance has high strength and good sealing performance, which can greatly improve the performance of the composite pipe such as high temperature resistance and tensile strength. Embodiment 2

[0024] AsFigure 2 As shown in the figure, a manufacturing method of a laser-welded non-metallic composite pipe includes the following steps: S1: The inner liner pipe 1 is extruded by a first extruder 4. After being shaped by a first cooling water tank 8 and passing through a second extruder 5, the second extruder 5 extrudes a reinforcing layer 2, which is vacuum-coated on the inner liner pipe 1 and then cooled and shaped by a second cooling water tank 9. S2: The first laser welder 6 is used to weld the inner liner pipe 1 and the reinforcing layer 2 outside the reinforcing layer 2. S3: After the welding of the inner liner pipe 1 and the reinforcing layer 2 is completed, an outer protective pipe 3 is extruded and shaped by a third extruder 7 and vacuum-coated on the outside of the welded inner liner pipe 1 and the reinforcing layer 2. After being cooled by a third cooling water tank 10, the second laser welder 11 is used to weld the outer protective pipe 3, and finally a non-metallic composite pipe is formed.

[0025] The manufacturing method of the present invention has a simple process and does not require changing the existing production line. Only by arranging a laser welder can the manufacturing of non-metallic composite pipes be realized, which can save manufacturing costs.

[0026] In the step S2, when the first laser welder 6 is used to weld the inner liner pipe 1 and the reinforcing layer 2 outside the reinforcing layer 2, the specific process is as follows: At a position 3 - 5 cm away from the circumferential surface of the reinforcing layer 2 outside, the first laser welder 6 is arranged circumferentially along the circumference of the reinforcing layer 2, and the laser range completely covers the circumferential perimeter of the inner liner pipe 1. The welding speed is set to 0.5 - 1 m / min, and the power of the laser welder is set to 200 - 300 W. When the inner liner pipe 1 and the reinforcing layer 2 pass through the first laser welder 6, the first laser welder 6 is turned on for welding, so that the laser penetrates the reinforcing layer 2 to reach the outer surface of the inner liner pipe 1, and the melting occurs at the joint between the outer surface of the inner liner pipe 1 and the inner surface of the reinforcing layer 2, so that the inner liner pipe 1 and the reinforcing layer 2 are welded into one body.

[0027] During the process of using the first laser welder 6 to weld the inner liner pipe 1 and the reinforcing layer 2 outside the reinforcing layer 2, a circumferential pressure of 1 - 3 Kg is simultaneously applied to the outside of the reinforcing layer 2, so that the inner liner pipe 1 and the reinforcing layer 2 are welded into one body.

[0028] In the step S3, the second laser welder 11 is used to weld the reinforcement layer 2 and the outer protection tube 3 outside the outer protection tube 3. The specific process is: at a position 3-5 cm away from the outer circumferential surface of the outer protection tube 3, the second laser welder 11 is arranged along the circumference of the outer protection tube 3, and the laser range completely covers the circumference of the reinforcement layer 2. The welding speed is set to 0.5-1m / min, and the laser welder power is set to 300-500W. When the liner tube 1, the reinforcement layer 2 and the outer protection tube 3 pass through the second laser welder 11, the second laser welder 11 is turned on for welding, so that the laser penetrates the outer protection tube 3 to reach the outer surface of the reinforcement layer 2, and the outer surface of the reinforcement layer 2 and the inner surface of the outer protection tube 3 are melted at the junction, so that the reinforcement layer 2 and the outer protection tube 3 are welded into one, and finally a non-metallic composite pipe is formed.

[0029] In step S3, during the welding process of the reinforcement layer 2 and the outer protection tube 3 outside the outer protection tube 3 by using the second laser welder 11, a circumferential pressure of 1-3 kg is simultaneously applied to the outer protection tube 3, so that the reinforcement layer 2 and the outer protection tube 3 are welded into one.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A laser-welded non-metallic composite pipe, characterized in that: It includes an inner lining pipe (1), a reinforcing layer (2) and an outer protective pipe (3). The outer wall of the inner lining pipe (1) is provided with a reinforcing layer (2), and the outer wall of the reinforcing layer (2) is provided with an outer protective pipe (3). The inner lining pipe (1) and the reinforcing layer (2), and the reinforcing layer (2) and the outer protective pipe (3) are connected by laser welding.

2. The laser-welded non-metallic composite pipe according to claim 1, characterized in that: The wall thickness of the inner lining pipe (1) is 2-5 mm, and the material of the inner lining pipe (1) is one of polyolefin, polyketone resin or polyamide resin.

3. The laser-welded non-metallic composite pipe according to claim 1, characterized in that: The reinforcing layer (2) is 3-10 mm, and the material of the reinforcing layer (2) is one of polyolefin, polyketone resin or polyamide resin.

4. The laser-welded non-metallic composite pipe according to claim 1, characterized in that: The thickness of the outer protective pipe (3) is 3-5 mm, and the material of the outer protective pipe (3) is one of polyolefin, polyester, polyketone resin or polyamide resin.

5. A manufacturing method of the laser-welded non-metallic composite pipe according to claim 1, characterized in that: It includes the following steps: S1: The inner lining pipe (1) is extruded through a first extruder (4). After being shaped by a first cooling water tank (8), it passes through a second extruder (5). The second extruder (5) extrudes the reinforcing layer (2), which is vacuum-coated on the inner lining pipe (1), and then is cooled and shaped by a second cooling water tank (9); S2: Use a first laser welder (6) to weld the inner lining pipe (1) and the reinforcing layer (2) outside the reinforcing layer (2); S3: After the welding of the inner lining pipe (1) and the reinforcing layer (2) is completed, the outer protective pipe (3) is extruded and formed through a third extruder (7), and is vacuum-coated on the outside of the welded inner lining pipe (1) and the reinforcing layer (2). After being cooled by a third cooling water tank (10), the outer protective pipe (3) is welded by a second laser welder (11), and finally a non-metallic composite pipe is formed.

6. The manufacturing method of the laser-welded non-metallic composite pipe according to claim 5, characterized in that: In the step S2, when using the first laser welder (6) to weld the inner lining pipe (1) and the reinforcing layer (2) outside the reinforcing layer (2), the specific process is as follows: At a position 3-5 cm away from the circumferential surface of the outer layer of the reinforcing layer (2), the first laser welder (6) is arranged circumferentially along the circumference of the reinforcing layer (2). The laser range completely covers the circumferential perimeter of the inner lining pipe (1). The welding speed is set to 0.5-1 m / min, and the power of the laser welder is set to 200-300 W. When the inner lining pipe (1) and the reinforcing layer (2) pass through the first laser welder (6), turn on the first laser welder (6) for welding, so that the laser penetrates the reinforcing layer (2) to reach the outer surface of the inner lining pipe (1), and the melting occurs at the joint between the outer surface of the inner lining pipe (1) and the inner surface of the reinforcing layer (2), so that the inner lining pipe (1) and the reinforcing layer (2) are welded into one body.

7. The manufacturing method of a laser-welded non-metallic composite pipe according to claim 6, characterized in that: during the welding process of the inner liner pipe (1) and the reinforcing layer (2) using the first laser welder (6) outside the reinforcing layer (2), a circumferential pressure of 1-3 Kg is simultaneously applied to the outside of the reinforcing layer (2) to weld the inner liner pipe (1) and the reinforcing layer (2) into one body.

8. The manufacturing method of a laser-welded non-metallic composite pipe according to claim 5, characterized in that: in step S3, the second laser welder (11) is used to weld the reinforcing layer (2) and the outer protection pipe (3) outside the outer protection pipe (3). The specific process is as follows: at a position 3-5 cm away from the circumferential surface of the outer protection pipe (3), the second laser welder (11) is arranged circumferentially along the outer protection pipe (3). The laser range completely covers the circumferential perimeter of the reinforcing layer (2). The welding speed is set to 0.5-1 m / min, and the power of the laser welder is set to 300-500 W. When the inner liner pipe (1), the reinforcing layer (2), and the outer protection pipe (3) pass through the second laser welder (11), the second laser welder (11) is turned on for welding, so that the laser penetrates the outer protection pipe (3) to reach the outer surface of the reinforcing layer (2), and the molten state occurs at the joint between the outer surface of the reinforcing layer (2) and the inner surface of the outer protection pipe (3), welding the reinforcing layer (2) and the outer protection pipe (3) into one body, and finally forming a non-metallic composite pipe.

9. The manufacturing method of a laser-welded non-metallic composite pipe according to claim 8, characterized in that: during the welding process of the reinforcing layer (2) and the outer protection pipe (3) using the second laser welder (11) outside the outer protection pipe (3) in step S3, a circumferential pressure of 1-3 Kg is simultaneously applied to the outside of the outer protection pipe (3) to weld the reinforcing layer (2) and the outer protection pipe (3) into one body.

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