Butt joint laser welding aluminum plastic PE-Xa four-layer composite pipe and preparation method thereof

Abstract

The butt joint laser welding aluminum plastic PE-Xa four-layer composite pipe comprises a composite pipe body and a rotary type self-cleaning assembly installed at the end of the composite pipe body, the composite pipe body is of a four-layer structure and is sequentially provided with a PE-Xa inner layer, a hot melt adhesive layer, an aluminum strip layer and a PE-RT outer layer from inside to outside, the PE-Xa inner layer is machined and formed into a hollow tubular structure, and the PE-Xa outer layer is machined and formed into a hollow tubular structure. The surface of the PE-Xa inner layer is coated with the hot melt adhesive layer, the hot melt adhesive layer serves as an adhesive between the aluminum strip layer and the PE-Xa inner layer, the aluminum strip layer is welded into a tubular structure in a laser welding mode, the PE-RT outer layer is located on the outer side of the aluminum strip layer, and the rotary self-cleaning assembly comprises a hollow liquid guide disc, a connecting sleeve, an outer disc, a rotary adjusting frame, a dirt collector and a detector. On the basis that the strength and stability of the composite pipe are guaranteed, the cost is reduced, the rotary self-cleaning assembly is arranged at the end connecting position of the composite pipe, and the problems that in the daily use process of the composite pipe, due to dirt in liquid, the flow of the composite pipe becomes small, and the composite pipe is blocked are solved.

Description

Technical Field

[0001] The invention relates to the technical field of cross-linked polyethylene pipes, in particular to a butt laser welded aluminum-plastic PE-Xa four-layer composite pipe and a preparation method thereof. Background Art

[0002] As people's living standards and requirements for living conditions continue to improve, the heating and cooling systems, water supply systems, and air-conditioning systems of residential and office buildings are constantly changing and innovating. The original air-conditioning systems and fire water systems generally use copper pipes or cast iron pipes, which have the disadvantages of high overall cost, difficult installation, and inconvenient later maintenance. With the advancement of science and technology, composite pipes have emerged. Composite pipes are pipes composed of two or more materials to give full play to the advantages of various materials while making up for their respective shortcomings. This design structure can make the pipe have multiple properties and is suitable for different engineering needs and environmental conditions, greatly reducing the cost of using copper pipes or cast iron pipes, and also ensuring the use effect.

[0003] However, the existing composite pipes still have the following problems during use: the composite pipes have insufficient strength, high temperature and low temperature resistance, and the composite pipes are aged and delaminated during long-term use, which affects the normal use of the composite pipes. In addition, when the composite pipes are used to guide the liquid, the impurities and dirt that may exist in the liquid will block the composite pipes, which will cause the flow of the composite pipes to decrease or even become blocked over a long period of time. Therefore, it is necessary to design corresponding technical solutions to solve the existing technical problems. Summary of the invention

[0004] The purpose of the present invention is to provide a butt laser welded aluminum-plastic PE-Xa four-layer composite pipe and a preparation method thereof, which solves the technical problems that the strength, high temperature resistance and low temperature resistance of the composite pipe are insufficient, and the composite pipe is aged and delaminated during long-term use, thereby affecting the normal use of the composite pipe. In addition, when the composite pipe is used to guide the liquid, impurities and dirt that may exist in the liquid will block the composite pipe, which will cause the flow of the composite pipe to decrease for a long time, and even cause blockage.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a butt laser welded aluminum-plastic PE-Xa four-layer composite pipe, comprising a composite pipe body and a rotary self-cleaning assembly installed at the end of the composite pipe body, the composite pipe body is a four-layer structure and is sequentially provided with a PE-Xa inner layer, a hot melt adhesive layer, an aluminum tape layer and a PE-RT outer layer from the inside to the outside, the PE-Xa inner layer is processed and formed into a hollow tubular structure, the hot melt adhesive layer is coated on the surface of the PE-Xa inner layer and acts as an adhesive between the aluminum tape layer and the PE-Xa inner layer, the aluminum tape layer is welded into a tubular structure by laser welding, and the PE-RT outer layer is located on the outside of the aluminum tape layer;

[0006] The rotary self-cleaning component includes a hollow liquid guide plate, a connecting sleeve, an outer plate, a rotating adjustment frame, a dirt collector and a detector. A liquid guide cavity is formed inside the hollow liquid guide plate. The connecting sleeve is divided into two groups and is symmetrically installed at both ends of the hollow liquid guide plate. The connecting sleeve is embedded in the end of the composite pipe body. The outer plate is installed above the hollow liquid guide plate and is connected to the liquid guide cavity. The rotating adjustment frame is installed between the hollow liquid guide plate and the outer plate. The dirt collector is divided into two groups and is symmetrically installed at both ends of the rotating adjustment frame. The detector is installed on the rotating adjustment frame.

[0007] As a preferred embodiment of the present invention, the diameter of the hollow liquid guiding plate is larger than the diameter of the connecting sleeve and a connecting port is provided on the top.

[0008] As a preferred embodiment of the present invention, a window is provided on the top of the outer disk, and an arc-shaped cover plate is movably connected to the window. One end of the arc-shaped cover plate is rotatably connected to the outer disk and the other end is fixed to the outer disk by bolts.

[0009] As a preferred embodiment of the present invention, the rotating adjustment frame includes a connecting plate, a rotating disk, a split placement ring and a positioning clip. The connecting plate is fixed to the upper edge of the hollow liquid guide disk, the rotating disk is rotatably set on the connecting plate, the split placement ring is divided into two groups and is symmetrically installed on the rotating disk, and the dirt collector is located on the split placement ring and is clamped by two groups of positioning clips.

[0010] As a preferred embodiment of the present invention, the split placement ring is a three-section structure consisting of a plate body, an elastic connecting piece and a ring body. The plate body is connected to the rotating disk, and the two ends of the elastic connecting piece are respectively connected to the plate body and the ring body. The elastic connecting piece is a stacked structure.

[0011] As a preferred embodiment of the present invention, the sewage collector includes an outer ring and a sewage collecting net built into the outer ring, a plurality of filter holes are provided on the surface of the sewage collecting net, a sewage inlet is provided on one side of the sewage collecting net and a sewage collecting cavity is formed inside, and the sewage collecting net portion located on the sewage inlet side is a concave structure.

[0012] As a preferred embodiment of the present invention, the detector includes a weight sensor installed on a connecting plate and an alarm connected to the weight sensor through a line, the alarm is installed on an arc-shaped cover plate, the detection end of the weight sensor is connected to a traction line, the traction line is connected to a connecting column, and the connecting column is installed on the ring body.

[0013] As a preferred embodiment of the present invention, the specific preparation steps are as follows:

[0014] Step 1: PE-Xa based pipe molding process, PE-Xa material particles are heated to a molten state, and then extruded by the screw of the extruder, the molten material is extruded into a molding head, and finally shaped by the shape of the mold. After extrusion, the PE-Xa pipe will be cooled and solidified to form a pipeline structure;

[0015] Step 2: Secondary unwinding treatment: Place the formed PE-Xa base pipe in the unwinding equipment for secondary unwinding treatment, and adjust the tension and speed as needed to ensure that the pipe will not be twisted or damaged during the unwinding process;

[0016] Step 3: Glue coating treatment, using BC-6 hot melt adhesive with self-crosslinking properties and evenly coating it on the surface of the PE-Xa pipe;

[0017] Step 4: Aluminum tape wrapping treatment: cut the track into the size required to wrap the PE-Xa tube and bend it to wrap the surface of the PE-Xa tube so that the joints meet the contact requirements;

[0018] Step 5: Laser welding of aluminum tubes. Laser welding is used to replace sub-arc welding to evenly weld the aluminum strip joints.

[0019] Step 6: High-frequency secondary heating treatment, set the PE-RT outer layer on the outside of the aluminum pipe and use high-frequency heating equipment to perform high-frequency heating treatment on the joint, so that the PE-RT outer layer and the composite pipe can fit perfectly.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The laser butt-welded aluminum-plastic PE-Xa four-layer composite pipe designed by the present invention utilizes the characteristics of PE-Xa's resistance to high pressure, high temperature and thermal memory under high and low temperature conditions to be used as the inner pipe of the new four-layer aluminum-plastic composite pipe to ensure the flexibility of the pipe under high or low temperature conditions. Ultra-high strength aluminum strip is used as the aluminum pipe. Because the pipe needs to have high strength and improve the hardness of the pipe, BC-6 hot melt adhesive with self-crosslinking properties is used as the adhesive between the inner layer and the aluminum pipe. The biggest feature of this glue is that the adhesive strength of the glue increases with the alternation of hot and cold inside the pipe. It is getting stronger and stronger, which effectively solves the problem of pipeline aging resistance. It adopts a structure without outer glue. The outer glue is mainly used for connection in the aluminum-plastic composite pipe. The plastic itself and the aluminum strip will produce a strong bonding force. The use of PE-RT heat-resistant polyethylene type II material can effectively solve the problem of weak anti-aging ability of the outer layer material and stratification. In addition, laser welding is used instead of sub-arc welding for aluminum tube welding in the preparation process, which solves the problem that the high-strength aluminum strip has a complex composition when welding high-strength aluminum tubes. During the welding process, carbon deposition will occur on the tungsten needle and the aluminum tube will be damaged.

[0022] 2. The present invention provides a rotating self-cleaning assembly at the end connection of the composite pipe, which can solve the problem of reduced flow and blockage of the composite pipe due to dirt in the liquid during daily use of the composite pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the overall structure diagram of the present invention;

[0024] Figure 2 This is a structural diagram of the composite pipe body of the present invention;

[0025] Figure 3 This is a structural diagram of the rotary self-cleaning component of the present invention;

[0026] Figure 4 This is a structural diagram of the sewage collector described in the present invention.

[0027] In the figure: 1. composite pipe body; 2. rotary self-cleaning component; 3. PE-Xa inner layer; 4. hot melt adhesive layer; 5. aluminum tape layer; 6. PE-RT outer layer; 7. hollow liquid guide plate; 8. connecting sleeve; 9. outer plate; 10. rotating adjustment frame; 12. sewage collector; 13. detector; 14. liquid guide cavity; 15. connecting port; 16. window; 17. arc cover plate; 18. connecting plate; 19. rotating disk; 20. split placement ring; 21. positioning clip; 22. plate body; 23. elastic connecting piece; 24. ring body; 25. outer ring; 26. sewage collection net; 27. sewage inlet; 28. sewage collection cavity; 29. ​​weight sensor; 30. alarm; 31. traction line; 32. connecting column. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-4 The present invention provides a technical solution: a butt laser welded aluminum-plastic PE-Xa four-layer composite pipe, comprising a composite pipe body 1 and a rotary self-cleaning assembly 2 installed at the end of the composite pipe body 1, the composite pipe body 1 is a four-layer structure and is sequentially provided with a PE-Xa inner layer 3, a hot melt adhesive layer 4, an aluminum tape layer 5 and a PE-RT outer layer 6 from the inside to the outside, the PE-Xa inner layer 3 is processed and formed into a hollow tubular structure, the hot melt adhesive layer 4 is coated on the surface of the PE-Xa inner layer 3 and acts as an adhesive between the aluminum tape layer 5 and the PE-Xa inner layer 3, the aluminum tape layer 5 is welded into a tubular structure by laser welding, and the PE-RT outer layer 6 is located on the outside of the aluminum tape layer 5;

[0030] The rotary self-cleaning component includes a hollow liquid guide plate 7, a connecting sleeve 8, an outer plate 9, a rotating adjustment frame 10, a dirt collector 12 and a detector 13. A liquid guide cavity 14 is formed inside the hollow liquid guide plate 7. The connecting sleeve 8 is divided into two groups and is symmetrically installed at both ends of the hollow liquid guide plate 7. The connecting sleeve 8 is embedded in the end of the composite pipe body 1. The outer plate 9 is installed above the hollow liquid guide plate 7 and is connected to the liquid guide cavity 14. The rotating adjustment frame 10 is installed between the hollow liquid guide plate 7 and the outer plate 9. The dirt collector 12 is divided into two groups and is symmetrically installed at both ends of the rotating adjustment frame 10. The detector 13 is installed on the rotating adjustment frame 10.

[0031] Further improvement, such as Figure 3 As shown, the diameter of the hollow liquid guiding plate 7 is larger than the diameter of the connecting sleeve 8 and a communication port 15 is provided on the upper side.

[0032] Further improvement, such as Figure 3 As shown, a window 16 is provided on the top of the outer disk 9, and an arc-shaped cover plate 17 is movably connected to the window 16. One end of the arc-shaped cover plate 17 is rotatably connected to the outer disk 9 and the other end is fixed to the outer disk 9 by bolts. By opening the arc-shaped cover plate 17, the dirt collector 12 containing dirt inside can be disassembled and cleaned. This operation is performed when no liquid flows through the composite pipe.

[0033] Further improvement, such as Figure 3 As shown, the rotary adjustment frame 10 includes a connecting plate 18, a rotating disk 19, a split placement ring 20 and a positioning clip 21. The connecting plate 18 is fixed to the upper edge of the hollow liquid guide plate 7, and the rotating disk 19 is rotatably set on the connecting plate 18. The split placement ring 20 is divided into two groups and is symmetrically installed on the rotating disk 19. The dirt collector 12 is located on the split placement ring 20 and is clamped by two groups of positioning clips 21. The positioning clip 21 can achieve the purpose of quickly clamping and fixing the dirt collector 12 and disassembling it, thereby facilitating the treatment of dirt.

[0034] Further improvement, such as Figure 3 As shown, the split placement ring 20 is a three-section structure and comprises a plate body 22, an elastic connecting piece 23 and a ring body 24. The plate body 22 is connected to the rotating disk 19. The two ends of the elastic connecting piece 23 are respectively connected to the plate body 22 and the ring body 24. The elastic connecting piece 23 is a stacked structure. This design method facilitates adaptive deformation adjustment in coordination with the increase in weight of the sewage collector 12, thereby facilitating the perception of the weight sensor 29.

[0035] Further improvement, such as Figure 4As shown, the sewage collector 12 includes an outer ring 25 and a sewage collecting net 26 built into the outer ring 25. A plurality of filter holes are provided on the surface of the sewage collecting net 26. A sewage inlet 27 is provided on one side of the sewage collecting net 26 and a sewage collecting cavity 28 is formed inside. The part of the sewage collecting net 26 located on the sewage inlet 27 side is a concave structure. This design makes it easy for liquid to pass through the sewage collector 12 while introducing dirt from the sewage inlet 27 and storing it in the sewage collecting cavity 28, thereby achieving the purpose of collection.

[0036] Further improvement, such as Figure 3 As shown, the detector 13 includes a weight sensor 29 installed on the connecting plate 18 and an alarm 30 connected to the weight sensor 29 through a line. The alarm 30 is installed on the arc cover 17. The detection end of the weight sensor 29 is connected to a traction line 31. The traction line 31 is connected to a connecting column 32. The connecting column 32 is installed on the ring body 24. When the dirt inside the sewage collecting net 26 located at the lower composite pipe mouth increases and causes the weight to increase, the weight sensor 29 senses and transmits a signal to the alarm 30, and the alarm 30 sounds an alarm.

[0037] Specifically, the specific preparation steps are as follows:

[0038] Step 1: PE-Xa based pipe molding process, PE-Xa material particles are heated to a molten state, and then extruded by the screw of the extruder, the molten material is extruded into a molding head, and finally shaped by the shape of the mold. After extrusion, the PE-Xa pipe will be cooled and solidified to form a pipeline structure;

[0039] Step 2: Secondary unwinding treatment: Place the formed PE-Xa base pipe in the unwinding equipment for secondary unwinding treatment, and adjust the tension and speed as needed to ensure that the pipe will not be twisted or damaged during the unwinding process;

[0040] Step 3: Glue coating treatment, using BC-6 hot melt adhesive with self-crosslinking properties and evenly coating it on the surface of the PE-Xa pipe;

[0041] Step 4: Aluminum tape wrapping treatment: cut the track into the size required to wrap the PE-Xa tube and bend it to wrap the surface of the PE-Xa tube so that the joints meet the contact requirements;

[0042] Step 5: Laser welding of aluminum tubes. Laser welding is used to replace sub-arc welding to evenly weld the aluminum strip joints.

[0043] Step 6: High-frequency secondary heating treatment, setting the PE-RT outer layer 6 on the outside of the aluminum pipe and performing high-frequency heating treatment on the connection through high-frequency heating equipment, so that the PE-RT outer layer 6 and the composite pipe can fit perfectly.

[0044] When in use: This solution uses laser welding of aluminum-plastic PE-Xa four-layer composite pipes. The characteristics of PE-Xa's resistance to high pressure, high temperature and thermal memory under high and low temperature conditions are used for the inner pipe of the four-layer aluminum-plastic composite pipe to ensure the flexibility of the pipe under high or low temperature conditions. Ultra-high strength aluminum strips are used as aluminum pipes to improve the hardness of the pipes. BC-6 hot melt adhesive with self-cross-linking properties is used as the adhesive between the inner layer and the aluminum pipe. With the alternation of hot and cold inside the pipe, the adhesive force of the glue becomes stronger and stronger, which effectively solves the problem of pipeline aging resistance. The structure without outer glue is adopted. The outer glue is mainly used for connection in the aluminum-plastic composite pipe. A strong adhesive force will be generated between the plastic itself and the aluminum strip. The use of heat-resistant polyethylene type II material can effectively solve the problem of stratification due to the weak anti-aging ability of the outer layer material. Laser welding is used instead of sub-arc welding for aluminum pipe welding in the preparation process, which solves the problem of welding high-strength aluminum pipes. The composition of high-strength aluminum strip is relatively complex. During the welding process, carbon deposits will appear on the tungsten needle and the aluminum tube will be damaged. In addition, a rotating self-cleaning component is designed at the end of the composite tube. During the flow of internal liquid, the dirt is introduced from the sewage inlet 27 and stored in the sewage collecting chamber 28 to achieve the purpose of collection. As the collection amount increases, the split placement ring 20 deforms and stretches. When the dirt inside the sewage collecting net 26 located at the lower composite pipe mouth increases and the weight increases, the weight sensor 29 senses and transmits the signal to the alarm 30. The alarm 30 sounds an alarm. At this time, the staff can close the pipeline valve and open the arc cover 17, disassemble and clean the sewage collector 12 with dirt inside, and rotate the upper pollution-free sewage collector 12 downward for use. This can effectively solve the problem of reduced flow and blockage of the composite pipe due to dirt in the liquid during daily use.

[0045] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0047] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0048] Finally, it should be noted that the above description 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 aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A butt laser welded aluminum-plastic PE-Xa four-layer composite pipe, characterized in that: The invention comprises a composite pipe body (1) and a rotary self-cleaning assembly (2) installed at the end of the composite pipe body (1); the composite pipe body (1) is a four-layer structure and is provided with a PE-Xa inner layer (3), a hot melt adhesive layer (4), an aluminum tape layer (5) and a PE-RT outer layer (6) in sequence from the inside to the outside; the PE-Xa inner layer (3) is processed and formed into a hollow tubular structure; the hot melt adhesive layer (4) is coated on the surface of the PE-Xa inner layer (3) and acts as an adhesive between the aluminum tape layer (5) and the PE-Xa inner layer (3); the aluminum tape layer (5) is welded into a tubular structure by laser welding; and the PE-RT outer layer (6) is located on the outside of the aluminum tape layer (5); The rotary self-cleaning component comprises a hollow liquid guide plate (7), a connecting sleeve (8), an outer plate (9), a rotating adjustment frame (10), a dirt collector (12) and a detector (13); a liquid guide cavity (14) is formed inside the hollow liquid guide plate (7); the connecting sleeve (8) is divided into two groups and is symmetrically installed at the two ends of the hollow liquid guide plate (7); the connecting sleeve (8) is sleeved on the end of the composite pipe body (1); the outer plate (9) is installed above the hollow liquid guide plate (7) and is connected to the liquid guide cavity (14); the rotating adjustment frame (10) is installed between the hollow liquid guide plate (7) and the outer plate (9); the dirt collector (12) is divided into two groups and is symmetrically installed at the two ends of the rotating adjustment frame (10); and the detector (13) is installed on the rotating adjustment frame (10).

2. The butt laser welded aluminum-plastic PE-Xa four-layer composite pipe according to claim 1, characterized in that: The diameter of the hollow liquid-conducting plate (7) is greater than the diameter of the connecting sleeve (8) and a communication opening (15) is provided on the top.

3. The butt laser welded aluminum-plastic PE-Xa four-layer composite pipe according to claim 1, characterized in that: A window (16) is provided at the top of the outer disk (9), and an arc-shaped cover plate (17) is movably connected to the window (16). One end of the arc-shaped cover plate (17) is rotatably connected to the outer disk (9) and the other end is fixed to the outer disk (9) by bolts.

4. The butt laser welded aluminum-plastic PE-Xa four-layer composite pipe according to claim 2, characterized in that: The rotary adjustment frame (10) comprises a connecting plate (18), a rotating disk (19), a split placement ring (20) and a positioning clip (21); the connecting plate (18) is fixed to the upper edge of the hollow liquid guide disk (7); the rotating disk (19) is rotatably arranged on the connecting plate (18); the split placement ring (20) is divided into two groups and symmetrically installed on the rotating disk (19); the dirt collector (12) is located on the split placement ring (20) and is clamped by two groups of positioning clips (21).

5. The laser butt-welded aluminum-plastic PE-Xa four-layer composite pipe according to claim 4 is characterized in that: The split placement ring (20) is a three-section structure and comprises a plate body (22), an elastic connecting piece (23) and a ring body (24). The plate body (22) is connected to the rotating disk (19). The two ends of the elastic connecting piece (23) are respectively connected to the plate body (22) and the ring body (24). The elastic connecting piece (23) is a stacked structure.

6. The butt laser welded aluminum-plastic PE-Xa four-layer composite pipe according to claim 1, characterized in that: The sewage collector (12) comprises an outer ring (25) and a sewage collection net (26) built into the outer ring (25); a plurality of filter holes are provided on the surface of the sewage collection net (26); a sewage inlet (27) is provided on one side of the sewage collection net (26) and a sewage collection cavity (28) is formed inside the sewage collection net (26); the part of the sewage collection net (26) located on the side of the sewage inlet (27) is of an inwardly concave structure.

7. The butt laser welded aluminum-plastic PE-Xa four-layer composite pipe and its preparation method according to claim 5, characterized in that: The detector (13) comprises a weight sensor (29) mounted on a connecting plate (18) and an alarm (30) connected to the weight sensor (29) via a line, wherein the alarm (30) is mounted on the arc-shaped cover plate (17), a detection end of the weight sensor (29) is connected to a traction line (31), the traction line (31) is connected to a connecting column (32), and the connecting column (32) is mounted on the ring body (24).

8. A method for preparing a laser-welded aluminum-plastic PE-Xa four-layer composite pipe according to any one of claims 1 to 7, characterized in that: The specific preparation steps are as follows: Step 1: PE-Xa based pipe molding process, PE-Xa material particles are heated to a molten state, and then extruded by the screw of the extruder, the molten material is extruded into a molding head, and finally shaped by the shape of the mold. After extrusion, the PE-Xa pipe will be cooled and solidified to form a pipeline structure; Step 2: Secondary unwinding treatment: Place the formed PE-Xa base pipe in the unwinding equipment for secondary unwinding treatment, and adjust the tension and speed as needed to ensure that the pipe will not be twisted or damaged during the unwinding process; Step 3: Glue coating treatment, using BC-6 hot melt adhesive with self-crosslinking properties and evenly coating it on the surface of the PE-Xa pipe; Step 4: Aluminum tape wrapping treatment: cut the track into the size required to wrap the PE-Xa tube and bend it to wrap the surface of the PE-Xa tube so that the joints meet the contact requirements; Step 5: Laser welding of aluminum tubes. Laser welding is used to replace sub-arc welding to evenly weld the aluminum strip joints. Step 6: High-frequency secondary heating treatment, placing the PE-RT outer layer (6) on the outside of the aluminum tube and performing high-frequency heating treatment on the joint by high-frequency heating equipment, so that the PE-RT outer layer (6) and the composite tube can fit perfectly.

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