CN114893626B - Fiber-overlapped reinforced plastic composite winding pipe wall, pipe and manufacturing method - Google Patents

Fiber-overlapped reinforced plastic composite winding pipe wall, pipe and manufacturing method Download PDF

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Publication number
CN114893626B
CN114893626B CN202210530702.5A CN202210530702A CN114893626B CN 114893626 B CN114893626 B CN 114893626B CN 202210530702 A CN202210530702 A CN 202210530702A CN 114893626 B CN114893626 B CN 114893626B
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fiber
plastic
pipe
strip
winding
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CN114893626A (en
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请求不公布姓名
张江红
徐光明
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Anhui Yuexin Pipe Industry Co ltd
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Anhui Yuexin Pipe Industry Co ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00Rigid pipes
    • F16L9/16Rigid pipes wound from sheets or strips, with or without reinforcement
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00Producing tubular articles
    • B29D23/001Pipes; Pipe joints
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00Protection of pipes or objects of similar shape against external or internal damage or wear
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20Controlling water pollution; Waste water treatment

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

The invention discloses a fiber-overlapped reinforced plastic composite winding pipe wall, a pipe and a manufacturing method, which mainly comprises the steps of fusing a fiber base band in the pipe wall in a mode of multi-layer interval winding layout, so that plastic materials of the pipe wall and fibers form uniform distribution and stable combination; the fiber base bands are not overlapped when being wound, so that the quality problems of wrinkles and the like when being wound caused by the fact that the fibers are not ductile can be solved, and gaps of different fiber layers are arranged in a staggered mode, so that the problem of weakening and enhancing effects caused by the gaps is effectively solved; in addition, the hot-melt plastic is used for coating the cold fiber base band to form a reinforced composite strip material for winding, and the fiber base band does not need to be independently heated and wound, so that the combination stability between the fiber and the plastic can be further enhanced; the invention makes it possible to produce fiber overlapped reinforced pipe wall of arbitrary thickness, and pipe with different strength requirement may be produced by regulating the layer number of reinforced composite belt material; the invention has extremely strong practicability and huge market prospect.

Description

Fiber-overlapped reinforced plastic composite winding pipe wall, pipe and manufacturing method
Technical Field
The invention relates to a plastic pipeline technology, in particular to a plastic winding pipe, and specifically relates to a plastic pipe and a pipe wall which are composited with various fibers (including glass fibers, steel fibers and the like) for reinforcement, and a manufacturing method of the plastic pipe.
Background
The plastic pipeline is mainly made of PE, PP or mixed plastic materials, is widely applied to water delivery engineering projects because of the advantages of good corrosion resistance, good durability and the like, and is mainly divided into the enhancement of rigidity of an outer ring of the pipeline and the enhancement of pressure resistance in the pipeline according to different requirements in the prior art and the plastic pipeline on the market at present. The reinforcing method mainly aims at solving the problem that the plastic pipeline can resist external pressure after being buried so as not to deform or damage the pipeline structure, and comprises the steps of making a thick pipeline wall, improving the pipeline wall structure, adding reinforcing ribs and the like. The internal pressure resistance is mainly used for meeting the bearing strength of the pipeline to the internal pressure of a conveying medium and the water hammer effect, and the pipe is required to bear radial stretching and axial stretching at the same time, the most original mode of the reinforcing mode is to increase the wall thickness, but the mode can lead to great increase of the cost of the pipeline, and the plastic with a certain thickness can not be manufactured due to the problems of sagging (namely, the molten thick plastic wall can not be timely cooled by heat dissipation when being formed, the molten plastic can be influenced by self gravity to sag towards the gravity direction, and the pipe wall is seriously deformed), the difficulty of timely cooling and the like. Therefore, the prior art has a method of reinforcing by compounding high-strength fiber materials in plastics, and the reinforcing method can greatly increase the internal compressive strength of the pipeline by utilizing the high strength of the composite materials under the condition of no need of increasing the wall thickness. The fiber of the composite reinforcing material comprises glass fiber (glass fiber for short), aramid fiber, carbon fiber, steel fiber and the like, and the fiber belongs to high-strength materials with excellent performance, and the fiber is compounded into a plastic pipe, so that the method belongs to common practice in the prior art, and can greatly enhance the internal pressure resistance of the plastic pipe without increasing the thickness of the plastic pipe wall. In the prior art, the pipeline wall is almost made into a sandwich structure, the outer wall and the inner wall are made of plastic materials, and the fiber layer is sandwiched between the inner wall and the outer wall, which can be called a traditional sandwich fiber reinforced mode. However, since such high-strength fibers do not have the defect of stretch elasticity, the following technical problems exist when the fiber layer is centrally sandwiched between the inner and outer plastic walls in the winding tube:
1. when the plastic pipe is manufactured by adopting a plastic strip winding process, the fiber strip is also required to be wound on the inner wall formed by the plastic strip to form a fiber reinforced layer attached to the inner wall, but the fiber does not have the characteristic of plastic expansion elasticity, and the fiber strip is extremely easy to cause objective problems of wrinkling and uplift when being wound due to uneven inner wall caused by lap joint or processing process of the plastic strip in the manufacturing process, so that the fiber reinforced layer sandwiched between the inner wall and the outer wall of the plastic is inevitably provided with serious quality defects such as gaps, and the basic quality requirements of durability and compression resistance of the pipe can not be ensured;
2. in order to realize the radial and axial pressure resistance enhancement of the pipeline, the enhanced strength is required to meet the requirements of engineering detection standards, and the fiber strips are required to be mutually overlapped and wound in a multi-layer mode in a staggered mode, so that a net-shaped fiber reinforced layer with a certain thickness is sandwiched between the inner wall and the outer wall of the plastic. However, the fiber layer structure with certain thickness formed by directly stacking the fiber strips is poor in bonding stability, and is easy to generate gaps or serious quality defects such as micro bubbles and the like, so that the basic quality requirements of the durability and the compression resistance of the pipe can not be ensured;
3. the fiber strips used for reinforcing the pipeline are mostly cold strips formed by pre-impregnating fiber wires with plastic (resin), and in the process of manufacturing the pipeline, the fiber strips which need to be interwoven and laminated and wound must be preheated so that the plastic (resin) can be well bonded with each other in superposition, thus increasing the difficulty in controlling the preheating, because the plastic (resin) is easily melted at too high temperature to expose the fiber wires, the plastic (resin) is not uniform, and if the temperature is too low, a good bonding effect is not achieved, and serious quality defects can be caused to the pipe in both cases, and the implementation difficulty of the process is greatly increased.
Based on the above points, the fiber reinforced plastic winding pipe is hardly marketed in the field of winding plastic pipes.
The main caliber is below 500 mm, a smooth plastic inner pipe extruded once is adopted, the outer layers are alternately wound and bonded with unidirectional prepreg fiber strips, then the outer layers of plastic are coated to prepare the fiber reinforced composite pipe, the process problems of 3 above also exist, the joint surface of the middle fiber strip layer and the inner and outer plastic layers is small, the quality stability is difficult to ensure, the equipment investment for the caliber is above 500 mm, and the large caliber requirement cannot be met.
Disclosure of Invention
The invention aims to provide a plastic composite winding pipe wall with a plurality of fiber layers fused in the plastic, so as to effectively improve the composite stability of the fibers and the plastic.
In order to achieve the technical purpose, the scheme of the invention is as follows: the fiber overlapped reinforced plastic composite winding pipe wall is characterized in that: the pipe wall is formed by winding, superposing and fusing a plurality of plastic strips through pipe winding equipment, at least two fiber layers are fused in the pipe wall, the fiber layers are concentrically distributed at intervals on the radial section of the pipe wall, and the fiber layers are formed by winding fiber base bands through winding equipment respectively.
In order to prevent wrinkles from occurring during fiber winding to improve the quality of the pipe, preferably, the fiber base band of each fiber layer is wound in a mode that adjacent side edges are not overlapped, gaps are reserved between the adjacent side edges of the fiber base band, and the gaps of any one fiber layer and the gaps of the adjacent other fiber layer in the pipe wall are staggered.
Further, the fiber base band is a netlike fiber base band and is a strip soft band formed by interlacing fiber warps and wefts of the same material or different materials and thermoplastic the same into a plastic thin layer; the thermoplastic material of the reticular fiber base band and the material of the plastic band are the same material or have the material that can be mutually bonded after hot melting.
Further preferably, the reticular fiber base band is put into a hot-melt plastic band inner core through a coating die in a cooled state to form a reinforced composite band, the reinforced composite band is wound in parallel through a winding device in a hot-melt state to form a reinforced wall with a single fiber layer, and the wall is formed by overlapping and fusing multiple reinforced walls.
It is further preferred that each reinforced composite strip is welded against each other by adjacent sides of the strip during winding, the weld being a fiber-free joint.
The invention also provides a fiber-overlapped reinforced plastic composite winding pipe, which can effectively promote stable combination of the fiber base band and the plastic strip without independently heating and winding the fiber base band, and can greatly improve the manufacturing efficiency.
In order to achieve the technical purpose, the scheme of the invention is as follows: the pipe wall of the pipe is formed by winding, superposing and fusing plastic strips through pipe winding equipment, wherein at least two layers of reinforcing walls formed by winding the reinforced composite strips on the winding equipment are superposed and fused, and the reinforced composite strips are formed by fusing fiber base strips on a strip inner core through the plastic strips; the fiber base band is a strip soft band formed by fiber thermoplastic in a plastic thin layer, and the thermoplastic material and the plastic strip are made of the same material or are made of materials which can be mutually bonded after being hot-melted.
Further preferably, the fiber base band is a net-shaped fiber base band, and is a strip-shaped soft band formed by interlacing fiber warps and wefts and thermoplastic the fiber warps and wefts in a plastic thin layer, wherein the fiber warps and the wefts are made of fibers of the same or different materials. .
In order to prevent wrinkling during filament winding to improve tube quality, it is preferable that the reinforced composite strip is welded to each other by abutting adjacent sides during winding, the abutting weld being a fiber connectionless portion.
Preferably, the reinforcing walls are two or more layers, and the fiber non-connecting parts between adjacent reinforcing walls are staggered.
Preferably, the adjacent reinforcing walls are directly overlapped and fused.
Preferably, the adjacent reinforcing walls are spaced by non-reinforcing walls formed from a plastic strip of non-reinforced composite strip, and the reinforcing walls are fused with the adjacent non-reinforcing walls in a superimposed manner.
In order to further improve the performance of the pipe, the outer wall of the pipe is also wound with high ribs for enhancing the rigidity of the pipeline ring.
In order to ensure the flatness and smoothness of the outer wall of the pipe, the outer wall of the pipe is also wrapped with a plastic smooth layer uniformly wrapped by a wrapping die.
The invention also provides a method for manufacturing the fiber-overlapped reinforced plastic composite winding pipe, which can effectively promote the stable combination of the fiber base band and the plastic strip without independently heating and winding the winding fiber base band, can greatly improve the manufacturing efficiency, and can manufacture pipes with different strength requirements by adjusting the number of the reinforced composite strips.
In order to achieve the technical purpose, the scheme of the invention is as follows: a method for manufacturing a fiber-overlapped reinforced plastic composite winding pipe, which is characterized in that: the pipe wall of the fusion formed pipe is wound, overlapped and fused by utilizing a plurality of plastic strips through pipe winding equipment, at least two strips in the plastic strips are reinforced composite strips, the inner core of the reinforced composite strips is coated with fiber base strips, the fiber base strips are strip soft strips formed by thermoplastic fibers in a plastic thin layer, and the thermoplastic materials and the plastic strips are made of the same materials or materials which can be mutually bonded after being subjected to hot melting.
Further, the reinforced composite strip is made by adopting a coating die, a plastic hot melting state is extruded from the periphery of the coating die, meanwhile, a fiber base band in a cooling state enters the inner core of the hot melting plastic strip from the hollow position of the coating die, and a plastic thin layer on the fiber base band is subjected to hot melting at a high temperature from the hot melting plastic strip, so that the fiber base band is integrally fused to the inner core of the plastic strip.
Preferably, the fiber base band is thermoplastic in the plastic thin layer in a mode of interweaving fiber warps and wefts.
In order to prevent wrinkles from occurring during winding of the fibers to improve the quality of the pipe, preferably, the reinforced composite strip is welded by using adjacent side edges during winding, and the welded part is a fiber non-connecting part, so that a gap is reserved between the adjacent side edges of the inner core of the reinforced composite strip when the reinforced composite strip is wound along with the strip, and the fiber base material is ensured not to overlap and overlap to generate wrinkles.
In order to effectively eliminate the problem of weakening and enhancing effects possibly caused by gaps, preferably, when a plurality of reinforced composite strips are wound, a staggered winding mode is adopted between the reinforced composite strips, so that fiber non-connection parts formed after winding two different reinforced composite strips which are adjacent up and down are staggered.
In order to ensure the flatness and smoothness of the outer wall of the pipe, the outer wall of the pipe is further wrapped with a plastic smooth layer, and the plastic smooth layer uniformly wraps the whole outer wall of the pipe by a coating process through a coating die.
The beneficial effects of the invention are as follows:
(1) The fiber base bands are fused in the pipe wall of the pipe in a mode of multi-layer interval winding layout, so that plastic materials of the pipe wall and fibers form uniform distribution and stable combination, and the problems that in the prior art, the combination stability is poor and layer gaps are easy to occur when the fibers are wound from the phase to form an excessively thick single reinforcing layer are solved;
(2) The structure and the method can ensure that the fiber base bands are not overlapped when being wound, effectively solve the quality problems of wrinkles and the like when being wound caused by the fact that the fibers do not have ductility, and effectively solve the problem of weakening and enhancing effects caused by gaps by arranging gaps between different fiber layers in a staggered manner;
(3) Especially, the hot-melt plastic strip is used for coating the cold fiber base band to form the reinforced composite strip for winding, so that the fiber base band does not need to be independently heated, the fiber base band has the beneficial effect of effectively cooling the hot-melt plastic strip, the problem that the plastic strip is too thick and difficult to dissipate heat to cause sagging and unshaped during winding is effectively solved, and in addition, the combination stability between the fiber and the plastic can be further enhanced;
(4) The adoption of the multi-layer fusion lamination to form the pipe wall enables the production of fiber reinforced pipe walls with any thickness to be possible, the number of the applicable reinforced composite strips can be adjusted according to the pipe diameter and the internal pressure requirement, and the production can be realized without excessive modification of equipment;
in short, the invention can effectively improve the production efficiency of the high-strength pipe and save the production cost; the structure of the pipe wall of the pipe is scientific and reasonable, the production and the manufacture are convenient, the cost performance is obvious, and the pipe has excellent industrial practicability and huge market prospect.
Drawings
FIG. 1 is a perspective view of a wound pipe in accordance with a preferred embodiment of the present invention;
FIG. 2 is an enlarged view of the portion A of the axial cross-section of the tubing of FIG. 1;
FIG. 3 is a radial cross-sectional view of a wrapped tube wall in accordance with a preferred embodiment of the present invention;
FIG. 4 is an axial cross-sectional view of a wrapped tube wall in accordance with a preferred embodiment of the present invention;
FIG. 5 is a schematic view of a reinforced composite strip material in accordance with a preferred embodiment of the present invention;
FIG. 6 is a schematic view of a winding apparatus for manufacturing a pipe in the present invention;
FIG. 7 is a schematic illustration of an overmold layout for wrapping tubing in the present invention;
FIG. 8 is a schematic representation of the corresponding locations of each reinforced composite strip as it is wrapped around a pipe wall in the present invention;
fig. 9 is a schematic cross-sectional view of an overmold contemplated in the present invention.
Wherein: 100 pipe walls, 110 fiber base bands, 111 gaps, 120 plastic strips, 130 reinforced composite strips, 200 high-strength ribs, 210 high-strength rib coating layers, 220 high-strength rib corrugated pipes, 300 winding equipment, 400 coating molds, 410 plastic strip outlets, 420 fiber base band outlets, 500 hot-melt plastic mechanisms, 510 and hot-melt plastic feed pipes.
Detailed Description
The invention is further illustrated in the following, in conjunction with the accompanying drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. It is needless to say that the person skilled in the art realizes that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive in scope.
The fiber-overlapped reinforced plastic composite winding pipe is mainly made of plastic, and can be PE, PP, composite plastic and the like, and the specific plastic materials are selected by the skilled in the art according to the prior art and the performance requirements; the fiber in the invention comprises, but is not limited to, glass fiber, steel fiber, aramid fiber, carbon fiber and the like, or the mixture of different fibers (such as glass fiber and steel fiber are transversely and longitudinally interwoven to form mixed reinforced fiber), and glass fiber (glass fiber) can be optimized according to cost performance, because the glass fiber has the characteristics of small density (light weight) but extremely high mechanical strength and corrosion resistance, the glass fiber can be compounded in plastic to greatly strengthen the mechanical strength of the plastic, and the internal pressure resistance of the pipe can be greatly improved without increasing the thickness of the pipe wall of the plastic pipe, so that the plastic pipe can be suitable for more Gao Naya corrosion-resistant application scenes. The present invention relates to a coiled pipe, which is formed by extruding a strip material through an extrusion die head by a plastic extruder and bending and winding the strip material on a pipe forming and winding device, which are known techniques in the pipe field and are not described herein.
As shown in fig. 1 and 2, a preferred embodiment of the present invention is a tube having a fiber-reinforced, overlapping tube wall 100 with extremely high internal pressure resistance; preferably, in order to increase the ring stiffness of the pipe, the high-strength ribs 200 are further wound around the outside of the pipe wall, for example, by using a high-strength corrugated pipe 220 having unidirectional bending property to be combined with the pipe wall through the high-strength coating layer 210.
As shown in fig. 2, 3 and 4, the fiber-overlapped reinforced plastic composite winding pipe wall is formed by winding, superposing and fusing a plurality of plastic strips through pipe winding equipment, at least two fiber layers (six fiber layers in the illustration 2 and four fiber layers in the illustration 3) are fused in the pipe wall, and the specific fiber layer number can be designed and adjusted according to the requirement of the internal pressure resistance of the pipe. As shown in FIG. 3, the fiber layers are concentrically and circularly distributed at intervals on the radial section of the pipe wall, and each fiber layer is formed by winding a fiber base band 110 through winding equipment.
As described above, because the fiber itself is inextensible (glass fiber is also characterized by brittleness), this causes the fiber base tape to be wrinkled if it is partially overlapped by itself during winding, which is a technical problem that is difficult to overcome in the prior art, in order to prevent the wrinkling during winding of the fiber to improve the quality of the tube, in the solution of the present invention, the fiber base tapes of each fiber layer are prohibited from overlapping each other during winding (i.e., adjacent sides of the fiber base tape cannot be overlapped), so that a gap 111 is left between the adjacent sides of the fiber base tapes, i.e., the fiber base tapes are wound in a spliced manner, as shown in fig. 2 and 4, which ensures that the fiber base tapes do not overlap by themselves, i.e., are wound at intervals, which can effectively solve the problem of wrinkling during winding of the fiber, and can also achieve the beneficial effects of efficient continuous winding of the fiber base tapes. Of course, such intermittent winding with gaps tends to result in a pure plastic joint (i.e. a fiber-free joint) with no fiber overlap reinforcement in the axial section of the pipe wall, which affects the internal pressure resistance of the pipe wall (especially in pipes requiring multiple fiber layers with high internal pressure resistance), and in order to eliminate the problem of weakening and reinforcing effects that may be caused by gaps, the gaps of any one fiber layer and the gaps of another fiber layer in the pipe wall are arranged in a staggered manner, so that a cross-sectional view as shown in fig. 4 is formed, and such a staggered arrangement makes the axial section of the pipe wall entirely free of a completely fiber-free overlap reinforcement. It should be noted that after the pipe is cooled and formed, each strip and the adjacent strips are integrated, and the strips are integrated in a radial section or an axial section, so that no obvious boundary line between the strips as shown in fig. 4 appears, and fig. 4 is only a relevant boundary line shown for the convenience of understanding the present invention.
In the prior art, unidirectional fiber base bands are basically adopted for interlacing, so as to ensure the overall reinforcement of the pipe in the axial direction and the radial direction (because the pipe is required to bear radial stretching and axial stretching of the pipe wall from a conveying medium, otherwise, the pipe may be extruded or cracked), and the unidirectional fiber base bands are adopted for interlacing on equipment for winding and forming the pipe, which can greatly reduce the production efficiency and further complicate the process. In the scheme, the adopted fiber base band is a net-shaped fiber base band (the structure is not shown in the scheme, and can be understood by a person skilled in the art), and the net-shaped fiber base band is a strip soft band formed by interlacing fiber warps and wefts of the same or different materials and thermoplastic in a plastic thin layer, namely, the strip has reinforcing effects on the axial direction and the radial direction, so that the strip does not need to be interlaced and wound on pipe winding forming equipment, the pipe winding production efficiency can be greatly improved, and the process is simplified; in addition, the thermoplastic material of the net-shaped fiber base band and the plastic band are the same material or have the material that can be mutually bonded after hot melting, so that perfect fusion between the fiber base band and the plastic band can be ensured.
As the most innovative and preferred technique of the core of the present invention, as shown in fig. 5 and 9, the mesh-shaped fiber base tape 110 is put into the inner core of the hot-melted plastic tape 120 via the coating mold 400 in a cooled state to form the reinforced composite tape 130 in a hot-melted state, the reinforced composite tape is wound via the winding device to form the reinforced wall having the single-layer fiber layer, and the wall is formed by overlapping and fusing the multi-layer reinforced wall, unlike the prior art in which the fiber base tape is directly wound on the plastic wall on the winding device after being heated. The hot-melt plastic strip is used for coating the cold fiber base band to form the reinforced composite strip for winding, so that the fiber base band does not need to be independently heated, the problems of fiber exposure and the like caused by independently heating the fiber base band are avoided, corresponding procedures are reduced, the processing efficiency is greatly improved, and the energy consumption is reduced; especially, the fiber base band can play the beneficial effect of effective cooling hot melt plastic strip, can effectively solve the too thick difficult heat dissipation of plastic strip and lead to the problem such as melt sagging when twining, in addition, the comprehensive thermal cladding of hot melt plastic strip to the fiber base band can further strengthen the bonding stability between fiber and the plastics. The overmold 400 of the present invention, as shown in fig. 9, has a hollow plastic strip outlet 410 in cross section from which molten plastic material is extruded into a plastic strip having a hollow core, with the fibrous base strip 110 being placed in the mold from a fibrous base strip outlet 420 in the middle, and being continuously clad as plastic is extruded to form the composite reinforcing strip 130; the coating die 400 is arranged around the winding device, as shown in fig. 6 and 7, the fiber base band 110 is continuously fed into the coating die to form a hot-melt reinforced base band, and then the hot-melt reinforced base band is wound on the winding device, so that the production efficiency is greatly improved, and the process is greatly simplified.
Because it is ensured that the fibrous base strips do not overlap themselves during winding, and that gaps remain, each reinforcing composite strip is welded to each other during winding by adjacent sides of the strip in close proximity, i.e. corresponding to the gaps 111 of the fibrous base strips during winding, i.e. the axial cross-sectional structure shown in fig. 4, and there are several non-fibrous portions in each layer, i.e. corresponding to the gaps 111.
The invention also provides a fiber-overlapped reinforced plastic composite winding pipe, which can effectively promote stable combination of the fiber base band and the plastic strip without independently heating and winding the fiber base band, and can greatly improve the manufacturing efficiency.
As shown in fig. 3, 4 and 5, a fiber-overlapped reinforced plastic composite winding pipe, wherein the pipe wall of the pipe is formed by winding and overlaying a plastic strip through a pipe winding device, at least two layers of reinforced walls formed by winding a reinforced composite strip on the winding device are overlaid and fused, and the reinforced composite strip 130 is formed by fusing a fiber base band 110 to a strip inner core through a plastic strip 120; the fiber base band is a strip soft band formed by fiber thermoplastic in a plastic thin layer, and the thermoplastic material and the plastic strip are made of the same material or are made of materials which can be mutually bonded after being hot-melted. It should be noted that, after the wall of the pipe is fused and formed, since the plastics of the layers are fused together, the boundary between a certain reinforced wall and other reinforced wall or non-reinforced wall cannot be clearly distinguished in the axial section of the product, and fig. 4 is merely a schematic technical view for easy understanding. The reinforced composite strip is adopted in the scheme, so that the fiber baseband does not need to be independently heated, the problems of fiber exposure and the like caused by independently heating the fiber baseband are avoided, corresponding working procedures are reduced, the processing efficiency is greatly improved, and the energy consumption is reduced; especially, the fiber base band can play the beneficial effect of effective cooling hot melt plastic strip, can effectively solve the too thick difficult heat dissipation of plastic strip and lead to the problem such as melt sagging when twining, in addition, the comprehensive thermal cladding of hot melt plastic strip to the fiber base band can further strengthen the bonding stability between fiber and the plastics. The overmold 400 of the present invention, as shown in fig. 9, has a hollow plastic strip outlet 410 in cross section from which molten plastic material is extruded into a plastic strip having a hollow core, with the fibrous base strip 110 being placed in the mold from a fibrous base strip outlet 420 in the middle, and being continuously clad as plastic is extruded to form the composite reinforcing strip 130; the coating die 400 is arranged around the winding device, as shown in fig. 6 and 7, the fiber base band 110 is continuously fed into the coating die to form a hot-melt reinforced base band, and then the hot-melt reinforced base band is wound on the winding device, so that the production efficiency is greatly improved, and the process is greatly simplified.
In the preferred embodiment, the fiber base band is a mesh fiber base band (not shown in the scheme, which is a structure understood by those skilled in the art), and the mesh fiber base band is a long soft band formed by interlacing fiber warps and wefts of the same or different materials and thermoplastic in a plastic thin layer, namely, the band itself has a reinforcing effect on the axial direction and the radial direction, so that the band does not need to be interlaced and wound on a pipe winding forming device, and the efficiency of pipe winding production can be greatly improved and the process is simplified; in addition, the thermoplastic material of the net-shaped fiber base band and the plastic band are the same material or have the material that can be mutually bonded after hot melting, so that perfect fusion between the fiber base band and the plastic band can be ensured.
In order to prevent wrinkles from occurring during fiber winding and improve the quality of the pipe, the reinforced composite strip is mutually abutted and welded through adjacent side edges during winding, and the abutted and welded part is a fiber-free and connecting-free part. Because it is ensured that the fibrous base strips do not overlap themselves during winding, and that gaps remain, each reinforcing composite strip is welded to each other during winding by adjacent sides of the strip in close proximity to each other, the close proximity weld forming the gaps 111 of the respective fibrous base strip during winding, i.e. the axial cross-sectional structure shown in fig. 4, with a number of fiber non-junctions in each layer, i.e. corresponding to the gaps 111.
When the reinforcing walls are more than two layers, the fiber non-connecting parts between the adjacent reinforcing walls are staggered. This is done to eliminate the problem of weakening the reinforcing effect that may be caused by gaps (non-fibrous sites) 111, where any one layer of reinforcing wall in the tube wall is offset from the non-fibrous sites of an adjacent other layer of reinforcing wall, resulting in a cross-sectional view as shown in the axial cross-section of fig. 4, where the offset arrangement is such that there is no fully non-fibrous overlap reinforced site throughout the axial cross-section of the tube wall.
In a preferred scheme, the wall of the pipe is composed of a plurality of layers of reinforcing walls, and adjacent reinforcing walls are directly overlapped and fused. Of course, the skilled person may also adopt a solution of combining reinforcing walls and non-reinforcing walls according to specific requirements, i.e. adjacent reinforcing walls are spaced apart by non-reinforcing walls formed by a plastic strip of non-reinforced composite strip, the reinforcing walls being superimposed and fused with adjacent non-reinforcing walls. Therefore, the technical scheme can also be used for forming the pipe wall by adopting multi-layer fusion lamination, so that the production of the fiber-overlapped reinforced pipe wall with any thickness is possible, the number of the reinforced composite strips or the common plastic strips can be adjusted according to the pipe diameter and the internal pressure requirement, and the method can be realized without excessive modification of equipment.
In the preferred embodiment, the pipe wall of the pipe is further wrapped with a high-strength rib 200 for enhancing the pipe loop rigidity, and as shown in fig. 1 and 2, a high-strength rib bellows 220 with unidirectional bending property is used to form the high-strength rib 200 wrapped around the pipe wall by combining the high-strength rib cladding 210 with the pipe wall. Of course, the method for manufacturing the high rib and the structure of the high rib can be designed by the skilled person according to the actual requirements, which is not the technical problem to be solved by the invention.
In addition, the invention also provides a method for manufacturing the fiber-overlapped reinforced plastic composite winding pipe, which can effectively promote the stable combination of the fiber base band and the plastic strip without independently heating and winding the winding fiber base band, can greatly improve the manufacturing efficiency, and can manufacture pipes with different strength requirements by adjusting the number of the reinforced composite strips.
The method adopts the scheme that as shown in fig. 6, 7 and 8, a plurality of plastic strips are wound and overlapped by a pipe winding device 300 to form the pipe wall of a pipe, at least two strips in the plurality of plastic strips are reinforced composite strips 130, the inner core of the reinforced composite strips is coated with a fiber base band 110, the fiber base band 110 is a strip soft band formed by fiber thermoplastic in a plastic thin layer, and the thermoplastic material and the plastic strips are made of the same material or a material capable of being mutually bonded after hot melting.
Further, the reinforced composite strip is manufactured by adopting the coating die 400, the plastic strip is extruded from the periphery of the coating die in a hot melting state, meanwhile, the fiber base band in a cooling state enters the inner core of the hot melting plastic strip from the hollow position of the coating die, and the plastic thin layer on the fiber base band is subjected to high temperature from the hot melting plastic strip to be hot melted, so that the fiber base band is integrally fused to the inner core of the plastic strip. Preferably, the fiber base band is thermoplastic in the plastic thin layer in a mode of interweaving fiber warps and wefts.
In order to prevent wrinkles from occurring during winding of the fibers and improve the quality of the pipe, preferably, the reinforced composite strip is welded by using adjacent side edges during winding, and the welding part is a fiber non-connecting part, so that a gap is reserved between the adjacent side edges of the inner core of the reinforced composite strip when the reinforced composite strip is wound along with the strip, and the fiber base material is ensured not to overlap. It should be emphasized that each reinforced composite strip is welded by abutting adjacent sides of the strip against each other during winding, the abutting welding portions form the gaps (i.e. the fibers have no connection portions), that is, such a combination manner can ensure that the fiber-based strip built-in the reinforced composite strip still maintains gaps between the adjacent sides during winding, and effectively prevents the adjacent sides from overlapping during winding of the fiber-based strip, which is a key technical means for solving the problem of wrinkles and ridges due to material characteristics during winding of the fiber-based strip. The gap distance in the present invention may be very small or relatively large, and the specific size may be optionally adjusted according to the equipment accuracy requirement at the time of implementation, so long as the existence of the gap is ensured.
In order to effectively eliminate the problem of weakening and enhancing effects possibly caused by gaps, preferably, when a plurality of reinforced composite strips are wound, a staggered winding mode is adopted between the reinforced composite strips, so that fiber non-connection parts formed after winding two different reinforced composite strips which are adjacent up and down are staggered.
In order to ensure the flatness and smoothness of the outer wall of the pipe, the outer wall of the pipe is further wrapped with a plastic smooth layer, and the plastic smooth layer uniformly wraps the whole outer wall of the pipe by a coating process through a coating die.
The method has the beneficial effects that: (1) The fiber base bands are fused in the pipe wall of the pipe in a mode of multi-layer interval winding layout, so that plastic materials of the pipe wall and fibers form uniform distribution and stable combination, and the problems that in the prior art, the combination stability is poor and layer gaps are easy to occur when the fibers are wound from the phase to form an excessively thick single reinforcing layer are solved; (2) The structure and the method can ensure that the fiber base bands are not overlapped when being wound, effectively solve the quality problems of wrinkles and the like when being wound caused by the fact that the fibers do not have ductility, and effectively solve the problem of weakening and enhancing effects possibly caused by gaps by arranging gaps between different fiber layers in a staggered manner; (3) Especially, the hot-melt plastic strip is used for coating the cold fiber base band to form the reinforced composite strip for winding, so that the fiber base band does not need to be independently heated, the fiber base band has the beneficial effect of effectively cooling the hot-melt plastic strip, the problem that the plastic strip is too thick and difficult to dissipate heat to cause sagging and unshaped during winding is effectively solved, and in addition, the combination stability between the fiber and the plastic can be further enhanced; (4) The adoption of the multi-layer fusion lamination to form the pipe wall enables the production of fiber reinforced pipe walls with any thickness to be possible, the number of the applicable reinforced composite strips can be adjusted according to the pipe diameter and the internal pressure requirement, and the production can be realized without excessive modification of equipment;
in short, the invention can effectively improve the production efficiency of the high-strength pipe and save the production cost; the structure of the pipe wall of the pipe is scientific and reasonable, the production and the manufacture are convenient, the cost performance is obvious, and the pipe has excellent industrial practicability and huge market prospect.
The foregoing has shown and described the basic principles, main features and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (14)

1. The fiber overlapped reinforced plastic composite winding pipe wall is characterized in that: the pipe wall is formed by winding, superposing and fusing a plurality of plastic strips through pipe winding equipment, at least two fiber layers are fused in the pipe wall, the fiber layers are concentrically and circularly distributed at intervals on the radial section of the pipe wall, and each fiber layer is formed by winding a fiber base belt through the winding equipment; the fiber base bands of each fiber layer are wound in a non-lap joint mode of adjacent side edges, gaps are reserved between the adjacent side edges of the fiber base bands, and the gaps of any fiber layer in the pipe wall and the gaps of the other adjacent fiber layer are staggered; the fiber base band is a netlike fiber base band and is a strip soft band formed by interlacing fiber warps and wefts of the same material or different materials and thermoplastic the same into a plastic thin layer; the thermoplastic material of the reticular fiber base band and the material of the plastic band are the same material or have the material that can be mutually bonded after hot melting.
2. The fiber-reinforced plastic composite wound pipe wall of claim 1, wherein the reticulated fiber base strip is placed in a cooled state into a hot-melt plastic strip core via a cladding mold to form a reinforced composite strip, and the reinforced composite strip is wound side by side via a winding device in a hot-melt state to form a reinforced wall having a single fiber layer, and wherein the pipe wall is formed by superposition and fusion of multiple layers of the reinforced wall.
3. The fiber-reinforced plastic composite wrapped tube wall of claim 2, wherein each of the reinforced composite strips is welded to each other in close proximity to each other by hot melt adhesive on adjacent sides of the strips during wrapping, the close proximity weld being a fiber-free joint.
4. A fiber overlapped reinforced plastic composite winding pipe is characterized in that: the pipe wall of the pipe is formed by winding, superposing and fusing at least two plastic strips through pipe winding equipment, wherein at least two layers of reinforcing walls formed by winding reinforced composite strips on the winding equipment are superposed and fused, and the reinforced composite strips are formed by fusing fiber base strips on a strip inner core through the plastic strips; the fiber base band is a strip soft band formed by thermoplastic fibers in a plastic thin layer, and the thermoplastic material of the fiber base band and the material of the plastic band are the same or have the material capable of being mutually bonded after hot melting; the reinforced composite strip is welded by abutting adjacent sides against each other during winding, and the abutting welding part is a fiber non-connecting part.
5. The fiber-overlapped reinforced plastic composite winding pipe according to claim 4, wherein the fiber base band is a net-shaped fiber base band, and is a strip-shaped soft band formed by interlacing fiber warps and wefts and thermoplastic the fiber warps and wefts in a plastic thin layer, and the fiber warps and the fiber wefts are fibers of the same or different materials.
6. The fiber-reinforced plastic composite wound pipe according to claim 5, wherein the reinforcing walls are more than two layers, and fiber non-connecting portions between adjacent reinforcing walls are staggered.
7. The fiber-reinforced plastic composite wrapped pipe of claim 6, wherein the adjacent reinforcement walls are directly superimposed and fused.
8. The fiber-reinforced plastic composite wrapped pipe of claim 7, wherein the adjacent reinforcing walls are spaced apart by non-reinforcing walls formed from a plastic strip of non-reinforced composite strip material, the reinforcing walls being fusion superimposed with the adjacent non-reinforcing walls.
9. The fiber reinforced plastic composite wrapped pipe according to any of claims 4-8, wherein the outer wall of the pipe is further wrapped with a high rib for enhancing the loop stiffness of the pipe.
10. The fiber-reinforced plastic composite wound pipe according to any one of claims 4 to 8, wherein the outer wall of the pipe is further covered with a plastic smoothing layer uniformly covered with a covering mold.
11. A method for manufacturing a fiber-overlapped reinforced plastic composite winding pipe, which is characterized in that: winding, overlaying and fusing a plurality of plastic strips through a pipe winding device to form the pipe wall of the pipe, wherein at least two strips in the plurality of plastic strips are reinforced composite strips, the inner core of the reinforced composite strips is coated with a fiber base strip, the fiber base strip is a strip soft strip formed by thermoplastic fibers in a plastic thin layer, and the thermoplastic material of the fiber base strip and the material of the plastic strips are the same material or a material capable of being mutually bonded after hot melting; the reinforced composite strip is made by adopting a coating die, a plastic hot melting state is extruded from the periphery of the coating die, meanwhile, a fiber base band in a cooling state enters an inner core of the hot melting plastic strip from a hollow position of the coating die, a plastic thin layer on the fiber base band is subjected to high temperature from the hot melting plastic strip and is hot melted, and the fiber base band is integrally fused to the inner core of the plastic strip; when the reinforced composite strip is wound, adjacent side edges are used for welding, and the welding part is a fiber non-connecting part, so that gaps are reserved between the adjacent side edges of the inner core of the reinforced composite strip when the reinforced composite strip is wound, and the fiber base material is ensured not to overlap and lap by itself to generate wrinkles.
12. The method of manufacturing a fiber-reinforced plastic composite wound pipe according to claim 11, wherein the fiber base tape is thermoplastic in a plastic film by interlacing fiber warps and wefts, the fiber warps and wefts being of the same or different material fibers.
13. The method of manufacturing a fiber-reinforced plastic composite wound pipe according to claim 12, wherein when a plurality of reinforced composite strips are wound, a staggered winding mode is adopted between the reinforced composite strips, so that fiber non-connection parts formed after winding two different reinforced composite strips adjacent to each other are staggered.
14. The method of manufacturing a fiber-reinforced plastic composite wound pipe according to claim 12, wherein the outer wall of the pipe is further wrapped with a plastic smoothing layer, and the plastic smoothing layer uniformly wraps the outer wall of the pipe integrally by using a cladding process using a cladding mold.
CN202210530702.5A 2022-05-16 2022-05-16 Fiber-overlapped reinforced plastic composite winding pipe wall, pipe and manufacturing method Active CN114893626B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0516262A (en) * 1990-11-30 1993-01-26 Sekisui Chem Co Ltd Manufacture of fiber-reinforced thermoplastic resin tube
CN101016964A (en) * 2007-02-07 2007-08-15 李寿山 Heavy caliber high-strength plastic wound pipe having pipe wall made of wrapping material and manufacture method therefor
JP2011179626A (en) * 2010-03-03 2011-09-15 Furukawa Electric Co Ltd:The Resin pipe, manufacturing method and connecting method of the same, and resin tape
CN104421536A (en) * 2013-08-20 2015-03-18 吴耕田 Pressure pipe formed by thermal winding of composite wrapping belt and forming method
CN105987237A (en) * 2015-01-30 2016-10-05 林世平 High-strength pipe made by thermoplastic continuous fiber prepreg tapes and manufacturing method and manufacturing equipment
CN216407980U (en) * 2021-11-08 2022-04-29 四川慧科合创机械技术有限公司 Continuous fiber lattice structure reinforced thermoplastic pressure composite pipe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0516262A (en) * 1990-11-30 1993-01-26 Sekisui Chem Co Ltd Manufacture of fiber-reinforced thermoplastic resin tube
CN101016964A (en) * 2007-02-07 2007-08-15 李寿山 Heavy caliber high-strength plastic wound pipe having pipe wall made of wrapping material and manufacture method therefor
JP2011179626A (en) * 2010-03-03 2011-09-15 Furukawa Electric Co Ltd:The Resin pipe, manufacturing method and connecting method of the same, and resin tape
CN104421536A (en) * 2013-08-20 2015-03-18 吴耕田 Pressure pipe formed by thermal winding of composite wrapping belt and forming method
CN105987237A (en) * 2015-01-30 2016-10-05 林世平 High-strength pipe made by thermoplastic continuous fiber prepreg tapes and manufacturing method and manufacturing equipment
CN216407980U (en) * 2021-11-08 2022-04-29 四川慧科合创机械技术有限公司 Continuous fiber lattice structure reinforced thermoplastic pressure composite pipe

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