Bamboo winding composite pipe with porous structure

Abstract

The embodiment of the utility model discloses a bamboo winding composite pipe with a porous structure, which comprises a tubular body, and the tubular body comprises a lining layer, a structural layer and an outer protective layer which are sequentially connected from inside to outside; wherein the structural layer comprises an inner structural layer, a hollow interlayer and an outer structural layer which are sequentially connected from inside to outside. A traditional pipeline manufacturing technology is adopted, structural materials such as a hollow PE pipe or a corrugated plate or a perforated plate are added in the middle of a bamboo winding composite pipe structural layer, a hollow structure is formed, the section thickness of the pipeline is increased through the hollow structure, and therefore the rigidity grade of the pipeline is increased. When the pipeline bears external acting force, the hollow structure can deform to counteract impact force, stress on the lining layer is reduced, and the safety of a conveyed medium is improved. Compared with a method for increasing the thickness of a pipe wall structure layer of a full-bamboo pipeline, the hollow interlayer can reduce the weight of the pipeline, reduce the consumption of bamboo skin raw materials, improve the production efficiency and reduce the production and construction installation cost.

Description

Technical Field

[0001] The utility model relates to the technical field of composite pipes, in particular to a bamboo-wrapped composite pipe with a porous structure. Background Art

[0002] On April 15, 2016, China's patent (CN105715882B) disclosed "a small-caliber bamboo-wound composite pipe and its manufacturing method". The bamboo-wound composite pipe uses bamboo as the base material and resin as the adhesive. The composite pipe is prepared by multi-layer spiral winding. The composite pipe includes an inner lining layer, an intermediate reinforcement layer and an outer protective layer from the inside to the outside. The pipe has the advantages of being green and environmentally friendly, quick to install, and strong impact resistance. However, since the main raw materials come from artificially cut bamboo forests and the bamboo utilization rate is low, the pipe manufacturing cost is high, the market competitive advantage is not obvious, and it is not conducive to the promotion of advanced technology.

[0003] In order to reduce costs and improve product performance, the pipeline industry has developed composite pipe structures, sand-filled structures or hollow structures. Among them, the hollow structure has the best performance, such as polyethylene double-wall corrugated pipes. Chinese patent (CN111022781A) discloses "hollow wall structure fiberglass pipe and its manufacturing process". The pipe includes two inner and outer solid wall layers, and a hollow layer is provided between the two adjacent solid wall layers. The hollow layer includes a hard hollow pipe circumferentially wound around the inner solid wall layer of the ring, which improves the overall strength and reduces the weight and manufacturing cost. However, such pipes are all chemical pipes, which consume a lot of energy and pollution, are prone to aging and failure, and are difficult to recycle, which does not conform to the development direction of green building materials. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a porous bamboo-wrapped composite pipe to solve the technical problems of the existing bamboo composite pipes having high cost and low bamboo material utilization rate.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An embodiment of the utility model provides a porous structure bamboo wrapped composite tube, which comprises: a tubular body, wherein the tubular body comprises an inner lining layer, a structural layer and an outer protective layer connected in sequence from the inside to the outside; wherein the structural layer comprises an inner structural layer, a hollow interlayer and an outer structural layer connected in sequence from the inside to the outside.

[0007] Wherein, the hollow interlayer includes at least one interlayer.

[0008] Wherein, the interlayer is a hollow plastic tube, a corrugated board or a porous board.

[0009] Wherein, when the interlayer is two or more than two layers, a full bamboo structure layer is provided between adjacent interlayers.

[0010] Wherein, when the interlayer is two or more than two layers, a preset spacing is provided between adjacent interlayers, and the preset spacing is 4-10 mm.

[0011] Wherein, the thickness of the inner structure layer is 10 mm.

[0012] Wherein, the thickness of the outer structural layer is 6 mm.

[0013] Wherein, the inner lining layer is made of glass fiber reinforced plastic.

[0014] Wherein, the inner structure layer and the outer structure layer are both made of bamboo strips wound and bonded with amino resin.

[0015] Wherein, the porous plate is a nylon porous plate, the axial hole section of the nylon porous plate is a rectangle of 80*15mm, and the wall thickness of the nylon porous plate is 0.2mm.

[0016] The utility model adopts the advanced manufacturing technology of traditional pipes, adds hollow PE pipes, corrugated boards or porous boards and other structural materials in the middle of the bamboo-wound composite pipe structure layer to form a hollow wall structure. The hollow structure increases the cross-sectional thickness of the pipe, thereby increasing the rigidity level of the pipe. Since the sandwich material is a hollow structure, when the pipe is subjected to external forces, the hollow structure can produce deformation to offset the impact force, reduce the force on the inner lining layer, and improve the safety of the conveying medium. Compared with the method of increasing the thickness of the pipe wall structure layer of the full bamboo pipe, the porous bamboo-wound composite pipe adopts a hollow sandwich to reduce the weight of the pipe, reduce the amount of bamboo strips raw materials, improve production efficiency, and reduce production and construction and installation costs.

[0017] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an axial cross-sectional view of a porous bamboo-wrapped composite tube according to an embodiment of the utility model.

[0019] Figure 2 for Figure 1 Schematic diagram of the local A enlarged structure. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships described 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 referred device or element 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.

[0023] 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 utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0025] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0027] See also Figure 1 to Figure 2 This embodiment provides a porous bamboo-wrapped composite tube 100, which includes: a tubular body 10, wherein the tubular body 10 includes an inner lining layer 1, a structural layer 2, and an outer protective layer 3 connected sequentially from the inside to the outside; wherein the structural layer 2 includes an inner structural layer 21, a hollow interlayer 23, and an outer structural layer 22 connected sequentially from the inside to the outside. It can be understood that the inner lining layer 1, the inner structural layer 21, the hollow interlayer 23, the outer structural layer 22, and the outer protective layer 3 are all tubular bodies of equal thickness.

[0028] The hollow interlayer 23 includes at least one interlayer. In this embodiment, the hollow interlayer 23 is a single interlayer, and the interlayer is a porous plate.

[0029] Furthermore, the interlayer is a hollow plastic tube (hollow PE tube), a corrugated board or a porous board. The cross-sectional shape of the interlayer can be a variety of forms such as circular, rectangular, trapezoidal, W-shaped, etc. The interlayer material is wound along the mold circumferentially to the surface of the inner structure layer 21 to form a hollow interlayer 23 structure. The wrapping method can be a closed wrapping, that is, each hollow structure is an independent closed hollow compartment, and a plurality of hollow compartments are wound coaxially; continuous spiral winding can also be adopted, and a long strip of interlayer material is wound to form a connected middle interlayer structure. After the interlayer material is wound, 1-2 layers of polyester mesh cloth need to be wound around the outer wall of the material, and the winding tension should be not less than 100N, so that the interlayer material can be wrapped and limited into a circular ring to reduce internal stress. Since the interlayer material itself has a certain bending strength, and the pipe wall portion shared by adjacent interlayers forms an I-shaped structure, under the condition of the same bamboo winding structure layer thickness, the pipeline ring stiffness can be greatly improved.

[0030] In another embodiment, when the interlayer is two or more than two layers, a full bamboo structure layer is provided between adjacent interlayers. The hollow compartments formed by the interlayer structures of adjacent layers are preferably arranged in an inner and outer staggered manner. The two-layer or multi-layer interlayer structure can be selected from one or a combination of round tubes, square tubes, W plates or porous plates, and the specific process selection should be made according to the actual working conditions.

[0031] In another embodiment, when the interlayer is two or more than two layers, a preset spacing is set between adjacent interlayers, and the preset spacing is 4-10 mm. The space of the preset spacing is used to fill the structural layer resin, which is conducive to connecting the inner and outer structural layers into one, reducing interface problems, and improving overall performance. The interlayer spacing should not be too large or too small. If it is too large, more resin will be used and obvious weak parts will be formed. If the spacing is too small, less resin will not be able to effectively bond the inner and outer structural layers into one.

[0032] In this embodiment, the inner lining layer 1 is made of glass fiber reinforced plastic, specifically, it is made of fiber felt or non-woven fabric impregnated with adhesive through winding and curing to form an impermeable and smooth inner wall, which mainly realizes the medium transportation function of the pipeline.

[0033] The inner structure layer 21 and the outer structure layer 22 are both made of bamboo wound strips bonded with amino resin, and the bamboo strips close to the interlayer are preferably axial bamboo strips to ensure axial strength. The thickness of the bamboo strips is about 1.0 mm, and the thickness of the interlayer material is basically above 15 mm.

[0034] In this embodiment, the porous plate is a nylon porous plate, the cross section of the axial hole 231 of the nylon porous plate is a rectangle of 80*15mm, and the wall thickness of the nylon porous plate is 0.2mm. It is understandable that in other embodiments, the hole size and hole wall thickness of the above-mentioned porous plate can be changed according to the actual application scenario and technical needs. Amino resin is used to tightly fill the adjacent nylon porous plates.

[0035] In one embodiment, the thickness of the inner structure layer 21 is 10 mm, and the thickness of the outer structure layer 22 is 6 mm.

[0036] The outer protective layer 3 is a layer of resin coated on the outer surface of the pipe structural layer after solidification by spraying, which is mainly used to isolate the structural layer 2 from the external environment, play a role in waterproofing, anti-corrosion and radiation protection, and improve the service life of the product.

[0037] The porous bamboo-wrapped composite pipe of this embodiment adopts a hollow structure, which can increase the wall thickness and enhance the ring stiffness of the pipe, thereby reducing the amount of bamboo strips, resin and other materials used and reducing the cost of raw materials. In addition, the thickness of the bamboo strips is about 1.0 mm, while the thickness of the sandwich material is basically above 15 mm. The use of the sandwich structure can greatly improve production efficiency and shorten production time. In addition, the hollow structure is lighter than the full bamboo structure, which can make the pipe more convenient during transportation and installation and reduce energy consumption.

[0038] The porous bamboo wrapped composite pipe of this embodiment was subjected to a drop hammer impact strength comparison test. Under the same specifications, nominal diameter DN800mm, the same number of bamboo structure layers, and 250kg drop hammer conditions, the full bamboo structure pipe broke under a drop height of 1.5m, while the main structure of the porous bamboo wrapped composite pipe of this embodiment remained intact under a drop height of 2m. The comparison shows that the impact resistance of the hollow structure pipe is more than 30% higher than that of the full bamboo structure.

[0039] The porous bamboo-wrapped composite pipe of this embodiment adopts the advanced manufacturing technology of traditional pipes, and adds structural materials such as hollow PE pipes, corrugated boards or porous boards in the middle of the bamboo-wrapped composite pipe structural layer to form a hollow wall structure. The cross-sectional thickness of the pipe is increased by adopting the hollow structure, thereby improving the rigidity level of the pipe. Since the sandwich material is a hollow structure, when the pipe is subjected to external forces, the hollow structure can produce deformation to offset the impact force, reduce the force on the inner lining layer, and improve the safety of the conveying medium. Compared with the method of increasing the thickness of the pipe wall structural layer of the full bamboo pipe, the porous bamboo-wrapped composite pipe adopts a hollow sandwich to reduce the weight of the pipe, reduce the amount of bamboo strips raw materials, improve production efficiency, and reduce production and construction and installation costs.

[0040] The above examples are only used to further illustrate the technical content of the utility model, so that readers can understand it more easily, but it does not mean that the implementation methods of the utility model are limited to this. Any technical extension or re-creation made based on the utility model is protected by the utility model. The protection scope of the utility model shall be based on the claims.

Claims

1. A porous bamboo-wrapped composite pipe, characterized in that: It comprises: a tubular body, wherein the tubular body comprises an inner lining layer, a structural layer and an outer protective layer which are sequentially connected from the inside to the outside; wherein the structural layer comprises an inner structural layer, a hollow interlayer and an outer structural layer which are sequentially connected from the inside to the outside.

2. The porous bamboo-wrapped composite pipe according to claim 1, characterized in that: The hollow interlayer includes at least one interlayer.

3. The porous bamboo-wrapped composite pipe according to claim 2, characterized in that: The interlayer is a hollow plastic tube, a corrugated board or a porous board.

4. The porous bamboo-wrapped composite pipe according to claim 2, characterized in that: When the interlayer has two or more layers, a full bamboo structure layer is provided between adjacent interlayers.

5. The porous bamboo-wrapped composite pipe according to claim 2, characterized in that: When the interlayers are two or more than two layers, a preset distance is set between adjacent interlayers, and the preset distance is 4-10 mm.

6. The porous bamboo-wrapped composite pipe according to claim 2, characterized in that: The thickness of the inner structural layer is 10 mm.

7. The porous bamboo-wrapped composite pipe according to claim 2, characterized in that: The thickness of the outer structural layer is 6 mm.

8. The porous bamboo-wrapped composite pipe according to claim 1, characterized in that: The inner lining layer is made of glass fiber reinforced plastic.

9. The porous bamboo-wrapped composite pipe according to claim 1, characterized in that: The inner structure layer and the outer structure layer are both made of bamboo strips wound and bonded with amino resin.

10. The porous bamboo-wrapped composite pipe according to claim 3, characterized in that: The porous plate is a nylon porous plate, the axial hole section of the nylon porous plate is a rectangle of 80*15 mm, and the wall thickness of the nylon porous plate is 0.2 mm.

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