Bamboo fiber winding composite pipe and manufacturing method thereof

Abstract

The invention discloses a bamboo fiber winding composite pipe and a manufacturing method thereof, and relates to the technical field of bamboo fiber winding composite pipes, the composite pipe sequentially comprises a hard inner cylinder, a bamboo fiber winding layer and a hard outer cylinder from inside to outside; a plurality of protruding blocks are arranged on the outer side wall of the hard inner cylinder in an annular array mode, the length direction of the protruding blocks is consistent with the axial direction of the hard inner cylinder, the protruding blocks protrude outwards in the radial direction of the hard inner cylinder, the protruding blocks are arranged at intervals, the space between every two adjacent protruding blocks is filled with resin, and the bamboo fiber winding layers are arranged on the protruding blocks in a winding mode. A plurality of V-shaped grooves are formed in the inner side wall of the hard outer cylinder in an annular array mode, and the length direction of the V-shaped grooves is consistent with the axial direction of the hard outer cylinder. The composite pipe combines the natural corrosion resistance of the bamboo fiber and the chemical stability of the resin, has excellent mechanical strength and environmental aging resistance, and is suitable for long-term use in various severe environments.

Description

Technical Field

[0001] The present invention relates to the technical field of bamboo fiber wound composite pipes, and specifically to a bamboo fiber wound composite pipe and a manufacturing method thereof. The composite pipe combines the natural corrosion resistance of bamboo fiber and the chemical stability of resin, has excellent mechanical strength and environmental aging resistance, and is suitable for long-term use in various harsh environments. Background Art

[0002] With the acceleration of urbanization and the continuous advancement of infrastructure construction, pipelines, as an important transportation medium, play an irreplaceable role in many fields such as construction, agriculture, and industry. However, traditional pipes such as steel pipes, plastic pipes, and cement pipes have gradually exposed many disadvantages during use. Although steel pipes have high mechanical strength, they have poor corrosion resistance, are prone to rust, and have high production energy consumption, causing certain pollution to the environment; although plastic pipes are corrosion-resistant, they have relatively low mechanical strength, are prone to aging, and have a limited service life; cement pipes are heavy, inconvenient to construct, and have poor adaptability to the environment.

[0003] In order to solve these problems, people began to explore the use of new composite materials to make pipes. Composite materials have gradually become a research hotspot in the field of pipes due to their excellent properties, such as light weight, high strength, and corrosion resistance. Bamboo fiber, as a natural high-strength, corrosion-resistant material, has the advantages of renewable resources, short growth cycle, and low cost, so it has become one of the most popular reinforcing materials in composite materials.

[0004] However, it is not easy to effectively combine bamboo fiber with resin and make a composite pipe with high strength and stability. First, the surface of bamboo fiber is smooth, and the bonding force with resin is weak, which easily leads to interlayer peeling; second, the water absorption rate of bamboo fiber is high, which easily leads to the performance degradation of composite materials in humid environments; finally, a series of technical problems need to be solved in the production process of composite pipes, such as winding process, curing molding, and quality control.

[0005] Although some studies have attempted to use bamboo fiber to make composite pipes, most of them have problems such as unstable performance, complex production process, and high cost, making it difficult to achieve large-scale industrial production. Therefore, developing a bamboo fiber-wound composite pipe with excellent performance, simple production process, and reasonable cost and its production method has important practical significance and broad application prospects. Summary of the invention

[0006] The present invention provides a bamboo fiber wound composite pipe and a manufacturing method thereof, which significantly enhances the overall mechanical strength of the pipe by arranging a ring array of protrusions on the outside of the inner tube, filling resin between the protrusions, and then winding the bamboo fiber layer. At the same time, the V-shaped groove design on the inside of the hard outer tube not only increases the compression resistance of the pipe, but also effectively prevents the slippage of the bamboo fiber winding layer, thereby improving the structural stability.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a bamboo fiber winding composite tube, which comprises a hard inner tube, a bamboo fiber winding layer and a hard outer tube from inside to outside;

[0008] A plurality of protrusions are arranged in an annular array on the outer wall of the hard inner cylinder, the length direction of the protrusions is consistent with the axial direction of the hard inner cylinder, the protrusions protrude outward along the radial direction of the hard inner cylinder, the protrusions are arranged at intervals, and resin is filled between adjacent protrusions, and the bamboo fiber winding layer is wound around each protrusion;

[0009] A plurality of V-shaped grooves are arranged in a circular array on the inner side wall of the hard outer cylinder, and the length direction of the V-shaped grooves is consistent with the axial direction of the hard outer cylinder.

[0010] A method for manufacturing a bamboo fiber-wound composite pipe comprises the following steps:

[0011] a. Prepare a hard inner cylinder and arrange multiple protrusions on its outer wall in a circular array to ensure that the length direction of the protrusions is consistent with the axial direction of the hard inner cylinder, and the protrusions protrude radially outward along the hard inner cylinder, and the protrusions are arranged at intervals;

[0012] b. Inject uncured resin between adjacent bumps, and with the help of the surface tension of the resin, the uncured resin protrudes above the two bumps but does not overflow, so that the liquid surface of the resin is arched and maintains this shape until the resin is cured;

[0013] c. After the resin is solidified, the resin block with an arched surface is polished so that the protruding part of the resin matches the shape of the V-groove on the inner wall of the hard outer cylinder to be installed later, so as to ensure good structural stability and anti-corrosion performance;

[0014] d. Tightly wrap the bamboo fiber layer on the polished resin block and the convex block, and use the high strength and corrosion resistance of bamboo to enhance the mechanical properties and environmental aging resistance of the composite pipe;

[0015] e. Prepare a hard outer cylinder, and open a plurality of V-shaped grooves on its inner wall in a circular array, ensuring that the length direction of the V-shaped groove is consistent with the axial direction of the hard outer cylinder;

[0016] f. Insert the inner cylinder structure wrapped with the bamboo fiber layer into the hard outer cylinder, so that the outer surface of the bamboo fiber layer is in close contact with the V-shaped groove inside the hard outer cylinder to form a stable composite structure;

[0017] g. Carry out necessary sorting and inspection on the composite pipe to ensure that it meets the predetermined quality and performance requirements.

[0018] In some embodiments, in step c, when processing the resin block with an arched surface, rough cutting is first performed to remove excess resin, followed by a fine grinding process.

[0019] In some embodiments, in step d, when winding the bamboo fiber layer, a device for remotely detecting tension and angle is used to monitor in real time and ensure that the bamboo fiber layer is tightly and evenly wound with appropriate tension and angle.

[0020] In some embodiments, in step b, when injecting uncured resin between adjacent bumps, first ensure that the gaps between the bumps are uniform and clean without impurities, and then use precise metering equipment to slowly and evenly inject the uncured resin into the gaps.

[0021] In some embodiments, in step f, when the inner cylinder structure wrapped with the bamboo fiber layer is inserted into the hard outer cylinder, a laser positioning device is used to ensure accurate alignment between the inner cylinder structure and the hard outer cylinder.

[0022] In some embodiments, in step g, when necessary sorting and inspection are performed on the composite pipe, non-destructive testing technology is used to conduct a comprehensive inspection of the overall structure and internal quality of the composite pipe.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention significantly enhances the overall mechanical strength of the pipe by arranging an annular array of protrusions on the outside of the inner tube, filling the protrusions with resin, and then winding the bamboo fiber layer. The natural high strength of bamboo fiber combined with the chemical stability of resin makes the composite pipe show better compression and bending resistance when subjected to external forces.

[0025] Bamboo fiber itself has natural corrosion resistance. After the bamboo fiber is combined with resin in the present invention, a dense anti-corrosion layer is formed on the inner and outer surfaces of the composite pipe. This anti-corrosion layer can effectively resist the erosion of various corrosive media, so that the composite pipe can be used for a long time without corrosion in harsh environments.

[0026] The V-shaped groove design on the inner side of the hard outer tube of the present invention not only increases the compressive strength of the pipe, but also effectively prevents the slippage of the bamboo fiber winding layer. This design enables the bamboo fiber layer to fit tightly between the hard inner tube and the hard outer tube when the composite pipe is subjected to external force, thereby improving the overall structural stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic cross-sectional view of a composite tube of the present invention;

[0028] Figure 2 for Figure 1 A magnified view of point A;

[0029] Figure 3 It is a flowchart of the manufacturing method of the present invention.

[0030] In the figure: 1. hard inner cylinder; 2. convex block; 3. resin; 4. bamboo fiber winding layer; 5. hard outer cylinder. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] like Figure 1-2 As shown, this embodiment provides a bamboo fiber winding composite tube, which includes a hard inner tube 1, a bamboo fiber winding layer 4 and a hard outer tube 5 from the inside to the outside;

[0036] A plurality of protrusions 2 are arranged in an annular array on the outer wall of the hard inner tube 1. The length direction of the protrusions 2 is consistent with the axial direction of the hard inner tube 1. The protrusions 2 protrude outward along the radial direction of the hard inner tube 1. The protrusions 2 are arranged at intervals. Resin 3 is filled between adjacent protrusions 2. A bamboo fiber winding layer 4 is wound around each protrusion 2. By arranging the protrusions 2 in an annular array on the outer side of the inner tube, filling the resin 3 between the protrusions 2, and then winding the bamboo fiber layer, the overall mechanical strength of the pipe is significantly enhanced. The natural corrosion resistance of the bamboo fiber and the chemical stability of the resin 3 work together to ensure that the composite pipe can be used for a long time without being corroded in harsh environments.

[0037] A plurality of V-grooves are arranged in a circular array on the inner wall of the hard outer tube 5 , and the length direction of the V-grooves is consistent with the axial direction of the hard outer tube 5 . The V-groove design on the inner side of the hard outer tube 5 not only increases the compressive resistance of the pipe, but also effectively prevents the slippage of the bamboo fiber winding layer 4 , thereby improving the structural stability.

[0038] In this bamboo fiber-wound composite pipe, the hard inner tube 1 serves as the basic support structure, and the protrusion 2 thereon is designed to increase the contact area with the bamboo fiber winding layer 4, thereby improving the bonding force and mechanical bite effect. The resin 3 filling between the protrusions 2 not only fixes the bamboo fiber layer, but also forms an additional anti-corrosion layer. The bamboo fiber layer is tightly wound on the protrusions 2, and the high strength and corrosion resistance of the bamboo material itself are utilized to provide the composite pipe with the main mechanical properties and environmental aging resistance. At the same time, the natural texture of the bamboo fiber helps the penetration and curing of the resin 3 to form a firm overall structure. The hard outer tube 5 serves as the outermost layer of protection to resist external physical impact and chemical erosion. The V-groove design on the inside increases the radial compressive strength of the pipe on the one hand, and on the other hand, the groove structure can effectively lock the bamboo fiber layer to prevent it from slipping or delamination during long-term use, thereby ensuring the long-term stability of the pipe.

[0039] like Figure 3 As shown, this embodiment also provides a method for manufacturing a bamboo fiber wound composite tube, which is used to manufacture the above-mentioned bamboo fiber wound composite tube, comprising the following steps:

[0040] a. Prepare a hard inner cylinder 1, and arrange multiple protrusions 2 in a circular array on its outer wall, ensure that the length direction of the protrusion 2 is consistent with the axial direction of the hard inner cylinder 1, and the protrusion 2 protrudes radially outward along the hard inner cylinder 1, and each protrusion 2 is arranged at intervals;

[0041] b. Inject uncured resin 3 between adjacent bumps 2, and with the help of the surface tension of the resin 3, the uncured resin 3 protrudes above the two bumps 2 but does not overflow, so that the liquid surface of the resin 3 is arched and maintains this shape until the resin 3 is cured;

[0042] c. After the resin 3 is cured, the resin 3 block with an arched surface is polished so that the protruding portion of the resin 3 matches the shape of the V-shaped groove on the inner wall of the hard outer cylinder 5 to be installed later, so as to ensure good structural stability and anti-corrosion performance;

[0043] d. Tightly wrap the bamboo fiber layer around the polished resin 3 and the protrusion 2, and use the high strength and corrosion resistance of bamboo to enhance the mechanical properties and environmental aging resistance of the composite pipe;

[0044] e. Prepare a hard outer cylinder 5, and open a plurality of V-shaped grooves arranged in a circular array on its inner wall, ensuring that the length direction of the V-shaped groove is consistent with the axial direction of the hard outer cylinder 5;

[0045] f. The inner tube structure wrapped with the bamboo fiber layer is inserted into the hard outer tube 5, so that the outer surface of the bamboo fiber layer is in close contact with the V-shaped groove inside the hard outer tube 5 to form a stable composite structure;

[0046] g. Carry out necessary sorting and inspection on the composite pipe to ensure that it meets the predetermined quality and performance requirements.

[0047] In this manufacturing method, the resin 3 is allowed to protrude above the two protrusions 2, which can enhance the bonding force between the inner and outer layers of the composite pipe, prevent the bamboo fiber winding layer 4 from slipping or delaminating during long-term use, and further improve the long-term stability and corrosion resistance of the pipe. In addition, by polishing, it is ensured that the protruding part of the resin 3 is closely matched with the shape of the V-shaped groove, and the contact area between the resin 3 and the hard outer tube 5 can be increased, thereby improving the bonding force between them. This close combination helps to prevent structural damage caused by stress concentration during use. The design of the V-shaped groove itself is to increase the compressive capacity of the pipe and prevent the inner layer from slipping. By polishing to make the resin 3 fit the V-shaped groove, it can further ensure that the bamboo fiber winding layer 4 is effectively locked between the inner and outer tubes to prevent slipping or delamination during long-term use. And the adapted resin 3 blocks and the V-shaped groove can work together to enable the pipe to distribute stress more evenly when subjected to external force, thereby improving the overall strength and fatigue resistance of the pipe. The V-groove design helps to enhance the radial compressive resistance of the pipe, and the three polished resin blocks can better cooperate with the V-groove to jointly withstand external pressure and improve the compressive strength of the pipe.

[0048] In some embodiments, in step c, when the resin block 3 with an arched surface is processed, rough cutting is first performed to remove excess resin 3, followed by a fine grinding process to ensure that the surface of the resin block 3 is smooth and perfectly fits the shape of the V-groove without gaps or protrusions. By using the process of rough cutting first and then fine grinding, excess resin 3 can be efficiently removed while ensuring a tight fit between the resin block 3 and the V-groove. This perfect fit without gaps or protrusions not only enhances the structural stability of the pipe, but also effectively prevents external corrosive media from penetrating into the interior of the pipe, thereby improving the corrosion resistance and overall service life of the composite pipe. In addition, the process also helps to improve production efficiency and reduce manufacturing costs.

[0049] In some embodiments, in step d, when winding the bamboo fiber layer, a device for remotely detecting tension and angle is used to monitor in real time and ensure that the bamboo fiber layer is tightly and evenly wound around the resin 3 and the bump 2 with appropriate tension and angle, without looseness or excessive tension. By using a device for remotely detecting tension and angle, the winding process of the bamboo fiber layer can be monitored in real time to ensure that it is tightly and evenly wound around the resin 3 and the bump 2 with appropriate tension and angle. This precise winding method not only enhances the bonding force between the bamboo fiber layer and the resin 3 and the bump 2, but also improves the overall strength and stability of the composite pipe. At the same time, real-time monitoring and precise control help reduce stress concentration and prevent structural damage caused by excessive local stress during use, thereby further extending the service life of the composite pipe. In addition, the use of remote detection equipment also helps to improve production efficiency and reduce errors and waste caused by human factors.

[0050] In some embodiments, in step b, when injecting uncured resin 3 between adjacent bumps 2, first ensure that the gap between the bumps 2 is uniform and clean without impurities, and then use precise metering equipment to slowly and evenly inject the uncured resin 3 into the gap until the surface of the resin 3 forms an arch slightly protruding above the bump 2, and maintain this shape until the resin 3 is completely cured. By ensuring that the gap between the bumps 2 is uniform and clean without impurities, and using precise metering equipment to slowly and evenly inject the uncured resin 3 into the gap, it can be ensured that the resin 3 can form a uniform and strong bonding layer after curing. This uniform layer of resin 3 not only enhances the overall structural strength of the composite pipe, but also effectively prevents stress concentration and structural damage caused by uneven distribution of resin 3.

[0051] In some embodiments, in step f, when the inner cylinder structure wrapped with the bamboo fiber layer is inserted into the hard outer cylinder 5, a laser positioning device is used to ensure the precise alignment between the inner cylinder structure and the hard outer cylinder 5, so that the outer surface of the bamboo fiber layer and the V-shaped groove inside the hard outer cylinder 5 can accurately correspond and closely contact without offset or misalignment. In this way, the precise alignment between the inner cylinder structure and the hard outer cylinder 5 can be ensured.

[0052] In some embodiments, in step g, when the composite pipe is subjected to necessary sorting and inspection, non-destructive testing techniques, such as ultrasonic testing or X-ray testing, are used to comprehensively inspect the overall structure and internal quality of the composite pipe to ensure that there are no defects such as cracks, delamination, bubbles, etc., and that all performance indicators meet the predetermined quality and performance requirements. By using non-destructive testing techniques, such as ultrasonic testing or X-ray testing, to comprehensively inspect the composite pipe in step g, it can be ensured that the overall structure and internal quality of the composite pipe meet the predetermined standards. This comprehensive testing method can not only detect potential defects such as cracks, delamination, bubbles, etc., but also ensure that all performance indicators of the composite pipe meet the predetermined quality and performance requirements. This strict testing step helps to improve the production quality of the composite pipe, reduce the scrap rate, and ensure the reliability and durability of the final product. At the same time, the use of non-destructive testing technology can also help improve production efficiency and reduce the additional costs and time caused by repeated testing or repairs.

[0053] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A bamboo fiber wound composite tube, Features: It comprises, from inside to outside, a hard inner cylinder (1), a bamboo fiber winding layer (4) and a hard outer cylinder (5); A plurality of protrusions (2) are arranged in a ring array on the outer wall of the hard inner tube (1); the length direction of the protrusions (2) is consistent with the axial direction of the hard inner tube (1); the protrusions (2) protrude outward along the radial direction of the hard inner tube (1); the protrusions (2) are arranged at intervals; resin (3) is filled between adjacent protrusions (2); and the bamboo fiber winding layer (4) is wound around each protrusion (2); A plurality of V-shaped grooves are arranged in a circular array on the inner side wall of the hard outer cylinder (5), and the length direction of the V-shaped grooves is consistent with the axial direction of the hard outer cylinder (5).

2. A method for manufacturing a bamboo fiber wound composite pipe, used for manufacturing the bamboo fiber wound composite pipe according to claim 1, It is characterized in that The following steps are involved: a. Prepare a hard inner cylinder (1), and arrange a plurality of protrusions (2) on its outer wall in a circular array, ensure that the length direction of the protrusions (2) is consistent with the axial direction of the hard inner cylinder (1), and the protrusions (2) protrude radially outward along the hard inner cylinder (1), and the protrusions (2) are arranged at intervals; b. injecting uncured resin (3) between adjacent protrusions (2), and by means of the surface tension of the resin (3), the uncured resin (3) protrudes above the two protrusions (2) but does not overflow, so that the liquid surface of the resin (3) is arched and maintains this shape until the resin (3) is cured; c. After the resin (3) is cured, the resin (3) block with an arched surface is polished so that the protruding portion of the resin (3) matches the shape of the V-shaped groove on the inner wall of the hard outer cylinder (5) to be installed later, so as to ensure good structural stability and anti-corrosion performance; d. Tightly wrap the bamboo fiber layer around the polished resin (3) block and the protrusion (2), and use the high strength and corrosion resistance of bamboo to enhance the mechanical properties and environmental aging resistance of the composite pipe; e. Prepare a hard outer cylinder (5), and on its inner wall, arrange a plurality of V-shaped grooves in a circular array to ensure that the length direction of the V-shaped groove is consistent with the axial direction of the hard outer cylinder (5); f. The inner tube structure wrapped with a bamboo fiber layer is inserted into the hard outer tube (5), so that the outer surface of the bamboo fiber layer is in close contact with the V-shaped groove on the inside of the hard outer tube (5), forming a stable composite structure; g. Carry out necessary sorting and inspection on the composite pipe to ensure that it meets the predetermined quality and performance requirements.

3. The method for manufacturing a bamboo fiber-wound composite pipe according to claim 2, Features: In step c, when processing the block of resin (3) with an arched surface, firstly rough cutting is performed to remove excess resin (3), followed by fine grinding.

4. The method for manufacturing a bamboo fiber wound composite pipe according to claim 2, Features: In step d, when winding the bamboo fiber layer, a device for remotely detecting tension and angle is used to monitor in real time and ensure that the bamboo fiber layer is tightly and evenly wound with appropriate tension and angle.

5. The method for manufacturing a bamboo fiber-wound composite pipe according to claim 2, Features: In step b, when injecting uncured resin (3) between adjacent bumps (2), first ensure that the gaps between the bumps (2) are uniform and clean without impurities, and then use precise metering equipment to slowly and evenly inject the uncured resin (3) into the gaps.

6. The method for manufacturing a bamboo fiber wound composite pipe according to claim 2, Features: In step f, when the inner cylinder structure wrapped with the bamboo fiber layer is inserted into the hard outer cylinder (5), a laser positioning device is used to ensure accurate alignment between the inner cylinder structure and the hard outer cylinder (5).

7. The method for manufacturing a bamboo fiber-wound composite pipe according to claim 2, Features: In step g, when necessary sorting and inspection are performed on the composite pipe, non-destructive testing technology is used to conduct a comprehensive inspection of the overall structure and internal quality of the composite pipe.

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