CN114893626A - 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 PDFInfo
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- CN114893626A CN114893626A CN202210530702.5A CN202210530702A CN114893626A CN 114893626 A CN114893626 A CN 114893626A CN 202210530702 A CN202210530702 A CN 202210530702A CN 114893626 A CN114893626 A CN 114893626A
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- 238000004804 winding Methods 0.000 title claims abstract description 108
- 239000002131 composite material Substances 0.000 title claims abstract description 93
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 36
- 239000002990 reinforced plastic Substances 0.000 title claims abstract description 28
- 239000000835 fiber Substances 0.000 claims abstract description 241
- 239000004033 plastic Substances 0.000 claims abstract description 157
- 229920003023 plastic Polymers 0.000 claims abstract description 157
- 239000000463 material Substances 0.000 claims abstract description 79
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 42
- 239000012943 hotmelt Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims description 34
- 238000002844 melting Methods 0.000 claims description 16
- 230000008018 melting Effects 0.000 claims description 16
- 108010081750 Reticulin Proteins 0.000 claims description 14
- 239000012815 thermoplastic material Substances 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 230000002708 enhancing effect Effects 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 6
- 238000005253 cladding Methods 0.000 claims description 4
- 238000009757 thermoplastic moulding Methods 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 2
- 239000004831 Hot glue Substances 0.000 claims 1
- 229920001169 thermoplastic Polymers 0.000 claims 1
- 239000004416 thermosoftening plastic Substances 0.000 claims 1
- 230000003313 weakening effect Effects 0.000 abstract description 7
- 239000010410 layer Substances 0.000 description 76
- 239000011248 coating agent Substances 0.000 description 11
- 238000000576 coating method Methods 0.000 description 11
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- 230000002787 reinforcement Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
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- 230000007547 defect Effects 0.000 description 4
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- 238000005452 bending Methods 0.000 description 3
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- 238000005260 corrosion Methods 0.000 description 3
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- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 229920006231 aramid fiber Polymers 0.000 description 2
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- 238000005265 energy consumption Methods 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/16—Rigid pipes wound from sheets or strips, with or without reinforcement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Abstract
The invention discloses a fiber-overlapped reinforced plastic composite winding pipe wall, a pipe and a manufacturing method, wherein a fiber base band is fused in the pipe wall in a multi-layer interval winding layout mode, so that the plastic material of the pipe wall and fibers form uniformly distributed stable combination; the fiber base bands are not overlapped when being wound, so that the quality problems of folds and the like when the fibers are wound due to the fact that the fibers do not have ductility can be solved, and the problem of weakening and reinforcing effects caused by gaps can be effectively solved by arranging the gaps of different fiber layers in a staggered mode; in addition, the cold fiber base band is coated by the hot-melt plastic to form the reinforced composite strip for winding, so that the fiber base band does not need to be heated and wound independently, and the combination stability between the fibers and the plastic can be further enhanced; the invention makes it possible to produce fiber overlapped reinforced pipe wall with any thickness, and pipes with different strength requirements can be manufactured by adjusting the layer number of the reinforced composite strips; the invention has strong practicability and huge market prospect.
Description
Technical Field
The invention relates to a plastic pipeline technology, in particular to a plastic winding pipe, specifically a plastic pipe compounded with various fibers (including glass fiber, steel fiber and the like) for reinforcement, a pipe wall and a manufacturing method of the pipe.
Background
The plastic pipeline is mainly made of PE, PP or mixed plastic materials, and is widely applied to water delivery engineering projects due to the advantages of good corrosion resistance, good durability and the like. The method for enhancing the rigidity of the ring mainly aims to solve the problem that the plastic pipeline can resist external pressure after being buried in the ground so as not to extrude the pipeline to deform or damage the pipeline structure, and the enhancing method comprises a plurality of methods such as making a thick pipe wall, improving the pipe wall structure, increasing reinforcing ribs and the like. The internal pressure resistance is mainly to meet the bearing strength of the pipeline on the internal pressure and water hammer effect of a conveying medium, and the pipe is required to bear radial stretching and axial stretching simultaneously, the most original mode of the reinforcing mode is to increase the wall thickness, but the mode can cause the pipeline cost to be greatly increased, and the plastic with certain thickness can not be manufactured due to the problems of sagging (namely, the fused thick plastic wall cannot be cooled in time due to heat dissipation when being formed, the fused plastic can sag towards the gravity direction due to the self gravity, so that the pipe wall is seriously deformed) and the difficulty in cooling in time due to the factors such as heat dissipation. Therefore, in the prior art, a method for reinforcing a plastic by compounding a high-strength fiber material in the plastic is provided, and the inner pressure-resistant strength of the pipeline can be greatly increased by utilizing the high strength of the composite material without increasing the wall thickness. The fiber of the composite reinforced material comprises glass fiber (also referred to as glass fiber for short), aramid fiber, carbon fiber, steel fiber and the like, the fiber belongs to high-strength materials with excellent performance, the fiber is compounded into a plastic pipe, and the common practice in the prior art is adopted, so that the internal pressure resistance of the plastic pipe can be greatly enhanced under the condition of not increasing the thickness of the plastic pipe. The method in the prior art almost all makes the pipeline wall into a sandwich structure, the outer wall and the inner wall are made of plastic materials, and a fiber layer is sandwiched between the inner wall and the outer wall, which can be called as a traditional sandwich fiber reinforcement mode. However, the high-strength fiber has the defect of no extension elasticity, so that the mode of concentrating the fiber layer between the inner wall and the outer wall of the plastic has the following technical problems when being applied to the winding pipe:
1. when the plastic pipeline is manufactured by adopting a plastic strip winding process, the fiber strip also needs 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 extension elasticity, and the objective problems of folds and bulges of the fiber strip are easily caused in the winding process because the inner wall is uneven due to the overlapping of the plastic strip or the processing process, so that the fiber reinforced layer sandwiched between the inner wall and the outer wall of the plastic has serious quality defects such as gaps, and the basic quality requirements of the durability and the pressure resistance of the pipe cannot be ensured;
2. in order to realize the radial and axial pressure resistance enhancement of the pipeline, and the enhanced strength needs to meet the requirement of engineering detection standard, the fiber strips need to be mutually overlapped and wound in a multilayer mode, and a reticular fiber reinforced layer with a certain thickness is formed and sandwiched between the inner wall and the outer wall of the plastic. However, the fiber layer structure with a certain thickness formed by directly stacking the fiber strips is poor in combination stability, and is easy to form a layer to generate gaps or generate serious quality defects such as micro bubbles, so that the basic quality requirements of the durability and the pressure resistance of the pipe cannot be guaranteed;
3. the fiber tapes for pipeline reinforcement are mostly cold tapes formed by pre-impregnating fiber lines with plastic (resin), in the pipeline manufacturing process, the fiber tapes needing to be interwoven, laminated and wound must be preheated to ensure that the plastic (resin) can be well adhered to each other when being overlaid, so that the preheating control difficulty is increased, because the plastic (resin) is easy to melt at an overhigh temperature to cause the fiber lines to be exposed and the plastic (resin) not to be uniform, if the temperature is too low, the good adhesion effect cannot be achieved, the two conditions can cause serious quality defects to occur to the pipes, and the implementation difficulty of the process is greatly increased.
Based on the above problems, fiber reinforced plastic winding pipes are almost not available in the market in the field of winding plastic pipes.
The main caliber is below 500 mm, a smooth plastic inner pipe extruded at one time is adopted, a plurality of layers of unidirectional pre-impregnated fiber strips are wound and bonded in a crossed mode outside the smooth plastic inner pipe, and then the fiber reinforced composite pipe is manufactured by coating a plastic outer layer, the process problem of the above 3 is also solved, the joint surface of the middle fiber belt layer and the inner and outer plastic layers is small, the quality stability is difficult to ensure, the equipment investment is huge when the caliber is above 500 mm, and the requirement of large caliber cannot be met.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a plastic composite winding pipe wall with multiple fiber layers fused in the plastic to effectively improve the composite stability of the fiber and the plastic.
In order to realize the technical purpose, the scheme of the invention is as follows: the utility model provides a compound winding pipe wall of fibre overlap reinforced plastics which 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 distributed on the radial section of the pipe wall at intervals in concentric circles, and the fiber layers are formed by respectively winding fiber base bands through the winding equipment.
In order to prevent wrinkles from occurring during fiber winding so as to improve the quality of the pipe, preferably, the fiber base bands of each fiber layer are wound in a non-overlapping mode of adjacent sides, gaps are reserved between the adjacent sides of the fiber base bands, and the gaps of any one layer of fiber layer in the pipe wall and the gaps of the other adjacent layer of fiber layer are in a mutually staggered layout.
Furthermore, the fiber base belt is a reticular fiber base belt and is a long strip soft belt formed by interlacing fiber warps and wefts which are made of the same material or different materials and thermally molding the fibers in the plastic thin layer; the thermoplastic material of the reticular fiber base band and the plastic band are the same material or the material which can be mutually bonded after hot melting.
Further preferably, the reticular fiber base band is placed into the inner core of the hot-melt plastic band through an overmould 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 pipe wall is formed by overlapping and fusing a plurality of layers of reinforced walls.
It is further preferred that each of the reinforced composite tapes is welded together by abutting side edges of the tapes during winding, the abutting welds being fibre-free.
The invention also provides a fiber overlapping reinforced plastic composite winding pipe, which can effectively improve the stable compounding of the fiber base band and the plastic strip, does not need to separately heat and wind the wound fiber base band, and can greatly improve the manufacturing efficiency.
In order to realize the technical purpose, the scheme of the invention is as follows: a fiber overlapped reinforced plastic composite winding pipe is characterized in that the pipe wall of the pipe is formed by winding, overlapping and fusing plastic strips through a pipe winding device, wherein at least two layers of reinforced walls formed by winding the reinforced composite strips on the winding device are overlapped 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 molding of fibers in a plastic thin layer, and the thermoplastic material and the plastic band material are the same material or are made of materials which can be mutually bonded after hot melting.
Further preferably, the fiber base tape is a net-shaped fiber base tape, and is a long soft tape formed by interlacing fiber warps and wefts and thermally molding the fibers in a plastic thin layer, wherein the fiber warps and wefts are fibers made of the same or different materials. .
In order to prevent wrinkles from occurring during winding of the fibers and improve the quality of the pipe, it is preferable that the reinforced composite tapes are welded by abutting adjacent side edges against each other during winding, and the abutting welding part is a fiber-free part.
Preferably, the reinforcing walls are two or more layers, and the non-connected portions of the fibers between adjacent reinforcing walls are offset from each other.
Preferably, the adjacent reinforcing walls are fused directly one on top of the other.
Preferably, the adjacent reinforced walls are separated by non-reinforced walls formed by plastic strips of non-reinforced composite strips, and the reinforced walls are fused with the adjacent non-reinforced walls in an overlapping manner.
In order to further improve the performance of the pipe, high ribs for enhancing the rigidity of the pipeline ring are wound on the outer wall of the pipe.
In order to ensure the flatness and the smoothness of the outer wall of the pipe, the outer wall of the pipe is further wrapped with a plastic smooth layer which is 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 improve the stable compounding of the fiber base band and the plastic strip, does not need to separately heat and wind 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 reinforcing composite strips.
In order to realize the technical purpose, the scheme of the invention is as follows: a method of manufacturing a fiber-overlapped reinforced plastic composite wound pipe, characterized in that: utilize many plastic strips to pass through the pipe winding equipment winding stack to fuse the pipe wall of shaping tubular product, have two strips at least for the compound strip of reinforcing in many plastic strips, the inner core cladding of the compound strip of reinforcing has the fibre baseband, the fibre baseband is the long-strip soft area that the fibre thermoplasticity formed in the plastics thin layer, the material of thermoplasticity material and plastic strip adopts the same material or has the material that both can bond each other after the hot melt.
Furthermore, the reinforced composite strip is made by adopting a coating die, plastic is extruded from the periphery of the coating die in a hot melting state, meanwhile, the fiber base strip 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 strip is subjected to high temperature from the hot melting plastic strip to be subjected to hot melting, so that the fiber base strip is integrally fused on the inner core of the plastic strip.
Preferably, the fiber base belt is thermoplastic-molded in the plastic thin layer by adopting a mode of interweaving fiber warps and wefts.
In order to prevent wrinkles from occurring during fiber winding to improve the quality of the pipe, it is preferable that 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 left between the adjacent side edges of the fiber base strip of the inner core of the reinforced composite strip when the strip is wound, and the fiber base material is ensured not to overlap and lap to generate wrinkles.
In order to effectively eliminate the problem of weakening the reinforcing effect possibly caused by the gap, preferably, when a plurality of reinforcing composite strips are wound, a staggered winding mode is adopted between the reinforcing composite strips, so that the fiber non-connecting parts formed after the two different reinforcing composite strips which are adjacent up and down are wound are staggered.
In order to ensure the flatness and the 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 is uniformly wrapped on the outer wall of the pipe integrally by adopting a wrapping mold and utilizing a wrapping process.
The invention has the beneficial effects that:
(1) the fiber base band is fused in the pipe wall of the pipe in a multi-layer interval winding layout mode, so that the plastic material of the pipe wall and the fibers form uniformly distributed 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 by themselves to form an over-thick single reinforcing layer are solved;
(2) the structure and the method can ensure that the fiber base band is not overlapped when being wound, effectively overcome the quality problems of folds and the like when being wound because the fiber does not have ductility, and effectively eliminate the problem of weakening and enhancing effect caused by gaps by the staggered arrangement of the gaps of different fiber layers;
(3) particularly, the cold fiber base band is coated by the hot-melt plastic band to form the reinforced composite band, and then the reinforced composite band is wound, so that the fiber base band is not required to be heated independently, the fiber base band can effectively cool the hot-melt plastic band, the problem that the plastic band is too thick and is difficult to dissipate heat to cause the deformation of the hot-melt plastic band during winding is effectively solved, and in addition, the combination stability between the fibers and plastics can be further enhanced;
(4) the tube wall is formed by adopting multi-layer fusion so that the production of the fiber reinforced tube wall with any thickness is possible, the number of the applicable reinforced composite strips can be adjusted according to the requirements of the tube diameter and the internal pressure, and the production can be realized without excessively changing equipment;
in a word, the invention can effectively improve the production efficiency of the high-strength pipe and save the production cost; the pipe wall of the pipe is scientific and reasonable in structure, convenient to produce and manufacture, obvious in cost performance, excellent in industrial practicability and huge in market prospect.
Drawings
FIG. 1 is a perspective view of a wound tube according to a preferred embodiment of the present invention;
FIG. 2 is an enlarged view of the axial section A of the pipe of FIG. 1;
FIG. 3 is a radial cross-sectional view of a wound 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 tape construction in a preferred embodiment of the invention;
FIG. 6 is a schematic view of a winding apparatus for manufacturing the tube material of the present invention;
FIG. 7 is a schematic view of an overmold layout for winding the tubing of the present invention;
FIG. 8 is a schematic view of the corresponding positions of the reinforcing composite strips as they are wrapped around the wall of the pipe in accordance with 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 bands, 130 reinforced composite bands, 200 high ribs, 210 high rib coating layers, 220 high rib corrugated pipes, 300 winding equipment, 400 coating dies, 410 plastic band outlets, 420 fiber base band outlets, 500 hot melt plastic mechanisms, 510 hot melt plastic feeding pipes.
Detailed Description
The invention is further illustrated below with reference to the figures and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. Needless to say, a person skilled in the art realizes that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.
The invention relates to a fiber overlapping reinforced plastic composite winding pipe, which is mainly made of plastic, such as PE, PP, composite plastic and the like, wherein the specific used plastic material is selected by technicians in the field according to the prior art and performance requirements; the fibers include, but are not limited to, glass fibers, steel fibers, aramid fibers, carbon fibers and the like, or a mixture of different fibers (for example, the glass fibers and the steel fibers are transversely and longitudinally interwoven to form a mixed reinforced fiber), the glass fibers (glass fibers) can be preferably selected according to cost performance, because the glass fibers have the characteristics of small density (lightness) but extremely high mechanical strength and corrosion resistance, and the glass fibers are compounded in the plastic, the mechanical strength of the plastic can be greatly enhanced, the internal pressure resistance of the plastic pipe can be greatly improved without increasing the wall thickness of the plastic pipe, and the plastic pipe can be suitable for more application scenes of high internal pressure resistance and corrosion resistance. The winding pipe material related to the present invention is mainly related to the extrusion of direct forming pipe material, the winding pipe material is formed by extruding strip material through an extrusion die head by a plastic extruder, and then bending and winding the strip material on a pipe forming and winding device to form the pipe material, which are all known in the pipe field, and will not be described herein.
As shown in fig. 1 and 2, a preferred embodiment of the present invention is a tube having a fiber-overlap reinforced wall 100 with an extremely high internal pressure resistance; preferably, in order to increase the annular rigidity of the pipe, high ribs 200 are further wound on the outside of the pipe wall, for example, a high rib corrugated pipe 220 having a unidirectional bending property is combined with the pipe wall through a high rib coating 210.
Fig. 2, 3 and 4 show a fiber-overlapped reinforced plastic composite wound pipe wall according to the present invention, the pipe wall is formed by winding, superposing and fusing a plurality of plastic tapes by a pipe winding device, at least two fiber layers (six fiber layers in fig. 2 and four fiber layers in fig. 3) are fused in the pipe wall, and the number of specific fiber layers can be designed and adjusted according to the requirement of internal pressure resistance of the pipe. As shown in figure 3, each layer of fiber layers is distributed on the radial section of the pipe wall at intervals in a concentric circle, each layer of fiber layers is formed by respectively winding fiber base bands 110 through winding equipment, and the structure is different from a single thick fiber layer formed by stacking a plurality of layers of fibers together in the prior art.
As mentioned above, because of the non-malleability of the fibers themselves (the glass fibers are also brittle), this leads to the fact that the fiber base tape must be wrinkled if it overlaps itself partially during winding, this is also a technical problem that is difficult to overcome in the prior art, in order to prevent the fiber from wrinkling during winding to improve the quality of the pipe, in the solution according to the invention, the fiber base tapes of each fiber layer are not allowed to overlap each other when wound (i.e. the adjacent sides of the fiber base tapes may not overlap), so that a gap 111 is left between the adjacent sides of the fiber base tapes, i.e. wound in a spliced manner, as shown in fig. 2 and 4, this gap ensures that the fibre based tape does not overlap itself, i.e. is wound at intervals, the method can effectively solve the problem of wrinkles during fiber winding and can also achieve the beneficial effect that the fiber base band can be efficiently and continuously wound. Of course, the interval winding with the gaps inevitably causes pure plastic connecting parts (i.e. fiber non-connecting parts) without fiber overlapping reinforcement in the axial section of the pipe wall, which affects the internal pressure resistance strength of the pipe wall (especially in a pipeline requiring multiple fiber layers with high requirement on internal pressure resistance), in order to eliminate the problem of weakening and reinforcing effect caused by the gaps, the gap of any one fiber layer in the pipe wall and the gap of another adjacent fiber layer are in a mutually staggered layout, so as to form a cross-sectional view presented by the axial section as shown in fig. 4, and such a staggered layout makes no part without fiber overlapping reinforcement in the whole axial section of the pipe wall. It should be noted that after the tube is cooled and formed, the strips and the adjacent strips are integrated into a whole in both radial and axial cross sections, without the distinct boundaries between the strips as shown in fig. 4, and fig. 4 is only the relevant boundaries shown for the convenience of understanding the present invention.
In the prior art, the unidirectional fiber base tapes are basically wound in a staggered manner to ensure the overall axial and radial reinforcement of the pipe (because the pipe is subjected to radial stretching and axial stretching of the pipe wall by a conveying medium, otherwise, the pipe may be extruded and exploded or cracked), and the unidirectional fiber base tapes are wound in a staggered manner on a pipe winding forming device, so that the production efficiency is greatly reduced, and the process is further complicated. In the scheme, the adopted fiber base belt is a reticular fiber base belt (not shown in the scheme, which is a structure that can be understood by a person skilled in the art), the reticular fiber base belt is a long strip soft belt formed by interlacing warp and weft of fibers with the same or different materials and thermally molding the fibers in a plastic thin layer, namely, the belt material has the enhancement effect on the axial direction and the radial direction, so that the interlacing winding on a pipe winding forming device is not needed, the efficiency of pipe winding production can be greatly improved, and the process is simplified; in addition, the thermoplastic material of the reticular fiber base belt and the plastic belt material are the same material or the material which can be mutually bonded after hot melting is adopted, so that the perfect fusion between the fiber base belt and the plastic belt material can be ensured.
As shown in fig. 5 and 9, the most preferred technique originally created as the core of the present invention is to put the reticular fiber base band 110 into the core of the hot-melt plastic band 120 via the coating die 400 in a cooled state to form the reinforced composite band 130, and the reinforced composite band is wound via the winding device in a hot-melt state to form the reinforced wall with a single fiber layer, and the pipe wall is formed by overlapping and fusing a plurality of layers of reinforced walls, which is different from the prior art that the fiber base band is directly wound on the plastic pipe wall on the winding device after being heated. The reinforced composite strip is formed by coating the cold fiber base band with the hot-melt plastic strip and then wound, so that the fiber base band is not required to be heated independently, the problems of fiber exposure and the like caused by independent heating of 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 effectively cooling the hot melt plastic band, can effectively solve the problem that the plastic band is too thick and is difficult to radiate heat to cause the fusion and the sag in winding, and in addition, the omnibearing thermal cladding of the hot melt plastic band on the fiber base band can further enhance the combination stability between fibers and plastics. The overmold 400 of the present invention is shown in fig. 9, and has a hollow plastic strip outlet 410 in cross-section, through which molten plastic material is extruded into a hollow plastic strip, and the fiber base strip 110 is inserted through a fiber base strip outlet 420 in the middle of the mold and continuously overmolded with the extruded plastic material to form the composite reinforcing strip 130; the covering mold 400 is disposed around the winding apparatus, as shown in fig. 6 and 7, the fiber base tape 110 is continuously fed into the covering mold to form a hot-melt reinforcing base tape, and then the hot-melt reinforcing base tape is wound on the winding apparatus, so that the production efficiency is greatly improved, and the process is greatly simplified.
Because it is ensured that the fiber-based tapes do not overlap themselves when wound, a gap is maintained, so that each of the reinforced composite tapes is welded by abutting side edges of the tapes against each other when wound, the abutting welding points corresponding to the gaps 111 of the fiber-based tapes when wound, i.e., the axial cross-sectional configuration shown in fig. 4, and there are several fiber-free points in each layer, i.e., corresponding to the gaps 111.
The invention also provides a fiber overlapping reinforced plastic composite winding pipe, which can effectively improve the stable compounding of the fiber base band and the plastic strip, does not need to separately heat and wind the wound 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, the pipe wall of which is formed by winding and overlapping fusion of a plastic strip via a pipe winding device, wherein at least two layers of reinforced walls formed by winding the reinforced composite strip on the winding device are overlapped and fused, and the reinforced composite strip 130 is formed by fusing a fiber base strip 110 to a strip inner core by the plastic strip 120; the fiber base band is a strip soft band formed by thermoplastic molding of fibers in a plastic thin layer, and the thermoplastic material and the plastic band material are the same material or are made of materials which can be mutually bonded after hot melting. It should be noted that, after the reinforced wall is fused and formed on the pipe wall of the pipeline, because the plastics of the layers are fused together, the boundary between a reinforced wall and other reinforced walls or non-reinforced walls cannot be clearly distinguished in the axial section of the product, and fig. 4 is only a technical schematic diagram for easy understanding. The reinforced composite strip is adopted in the scheme, so that the fiber base band does not need to be heated independently, the problems of fiber exposure and the like caused by independent heating of 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 effectively cooling the hot melt plastic band, can effectively solve the problem that the plastic band is too thick and is difficult to radiate heat to cause the fusion and the sag in winding, and in addition, the omnibearing thermal cladding of the hot melt plastic band on the fiber base band can further enhance the combination stability between fibers and plastics. The overmold 400 of the present invention is shown in fig. 9, and has a hollow plastic strip outlet 410 in cross-section, through which molten plastic material is extruded into a hollow plastic strip, and the fiber base strip 110 is inserted through a fiber base strip outlet 420 in the middle of the mold and continuously overmolded with the extruded plastic material to form the composite reinforcing strip 130; the covering mold 400 is disposed around the winding apparatus, as shown in fig. 6 and 7, the fiber base tape 110 is continuously fed into the covering mold to form a hot-melt reinforcing base tape, and then the hot-melt reinforcing base tape is wound on the winding apparatus, so that the production efficiency is greatly improved, and the process is greatly simplified.
In a preferred embodiment, the adopted fiber base belt is a reticular fiber base belt (not shown in the scheme, which is a structure that can be understood by a person skilled in the art), the reticular fiber base belt is a long and soft belt formed by interlacing warp and weft fibers of the same or different materials and thermally molding the interlaced warp and weft fibers in a plastic thin layer, namely, the belt material has a reinforcing effect on both the axial direction and the radial direction, so that interlaced winding on a pipe winding forming device is not needed, the efficiency of pipe winding production can be greatly improved, and the process can be simplified; in addition, the thermoplastic material of the reticular fiber base belt and the plastic belt material are the same material or the material which can be mutually bonded after hot melting is adopted, so that the perfect fusion between the fiber base belt and the plastic belt material can be ensured.
In order to prevent wrinkles from occurring during fiber winding and improve the quality of the pipe, the reinforced composite strips are tightly abutted and welded through adjacent side edges during winding, and the tightly abutted and welded part is fiber-free and connection-free. Because it is ensured that the fiber base tapes do not overlap with each other during winding, a gap is maintained, so that each of the reinforced composite tapes is welded by abutting the adjacent side edges of the tapes during winding, the abutting welding portions forming a gap 111 corresponding to the fiber base tapes during winding, i.e., the axial cross-sectional structure shown in fig. 4, and a plurality of fibers are not connected in each layer, i.e., corresponding to the gap 111.
When the reinforcing walls are two or more layers, the non-connecting portions of the fibers between the adjacent reinforcing walls are staggered. In order to solve the problem of weakening and reinforcing effect possibly caused by the gap (fiber-free part) 111, the present scheme is that the reinforcing wall of any layer and the fiber-free part of another adjacent layer are arranged in a staggered way to form a cross section as shown in fig. 4, and the staggered arrangement makes the whole axial cross section of the pipe wall have no part with completely non-fiber overlapping and reinforcing.
In a preferred scheme, the pipe wall of the pipe is completely composed of a plurality of layers of reinforced walls, and adjacent reinforced walls are directly overlapped and fused. Of course, the skilled person can also adopt a combination of reinforced walls and non-reinforced walls according to specific needs, that is, non-reinforced walls formed by plastic strips of non-reinforced composite strips are spaced between adjacent reinforced walls, and the reinforced walls are fused with the adjacent non-reinforced walls in an overlapping manner. Therefore, the scheme adopts multilayer fusion to form the pipe wall, so that the production of the fiber overlapping reinforced pipe wall with any thickness becomes possible, the number of the reinforced composite strips or common plastic strips can be adjusted according to the pipe diameter and the internal pressure requirement, and the production can be realized without excessively changing equipment.
In the preferred embodiment, the pipe material is further wrapped with high ribs 200 for enhancing the stiffness of the pipe loop, as shown in fig. 1 and 2, and the high ribs 200 wrapped around the pipe wall are formed by combining a high rib corrugated pipe 220 with unidirectional bending property with the pipe wall through a high rib wrapping layer 210. 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 present invention.
In addition, the invention also provides a method for manufacturing the fiber overlapped reinforced plastic composite winding pipe, which can effectively improve the stable compounding of the fiber base band and the plastic strip, does not need to separately heat and wind 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 reinforcing composite strips.
According to the scheme, as shown in fig. 6, 7 and 8, a plurality of plastic strips are used for winding, superposing and fusing the tube wall of the tube by a tube winding device 300, at least two strips of the plurality of plastic strips are reinforced composite strips 130, the inner core of each reinforced composite strip is coated with a fiber base strip 110, each fiber base strip 110 is a long strip soft strip formed by thermoplastic molding of fibers in a plastic thin layer, and the thermoplastic material and the plastic strips are made of the same material or are made of materials capable of being bonded with each other after hot melting.
Further, the reinforced composite strip is made 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 strip 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 strip is subjected to hot melting by the high temperature from the hot melting plastic strip, so that the fiber base strip is integrally fused on the inner core of the plastic strip. Preferably, the fiber base belt is thermoplastic-molded in the plastic thin layer by adopting a mode of interweaving fiber warps and wefts.
In order to prevent wrinkles from occurring when the fibers are wound and improve the quality of the pipe, it is preferable that the reinforced composite strip is welded by using adjacent side edges when the fibers are wound, and the welding part is a fiber non-connecting part, so that a gap is left between the adjacent side edges when the fiber base strip of the inner core of the reinforced composite strip is wound with the strip, and the fiber base materials are prevented from overlapping. It should be emphasized that, each reinforced composite strip is tightly welded to each other by the adjacent side edges of the strip when being wound, and the close welding part forms the gap (i.e. the fiber has no connection part), that is, such a combination mode can ensure that the fiber-based strips built in the reinforced composite strip still keep the gap between the adjacent side edges when being wound, and effectively prevent the adjacent side edges from overlapping when the fiber-based strips are wound, which is a key technical means for solving the problems of wrinkling and swelling caused by material characteristics when the fiber-based strips are wound. The distance of the gap in the invention can be a very small gap or a gap with a relatively large distance, and the specific size can be adjusted according to the requirement of equipment precision and the like in implementation, as long as the gap is ensured.
In order to effectively eliminate the problem of weakening the reinforcing effect possibly caused by the gap, preferably, when a plurality of reinforcing composite strips are wound, a staggered winding mode is adopted between the reinforcing composite strips, so that the fiber non-connecting parts formed after the two different reinforcing composite strips which are adjacent up and down are wound are staggered.
In order to ensure the flatness and the 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 is used for uniformly wrapping the outer wall of the pipe integrally by adopting a wrapping mold through a wrapping process.
The method has the beneficial effects that: (1) the fiber base band is fused in the pipe wall of the pipe in a multi-layer interval winding layout mode, so that the plastic material of the pipe wall and the fibers form uniformly distributed 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 by themselves to form an over-thick single reinforcing layer are solved; (2) the structure and the method can ensure that the fiber base band is not overlapped when being wound, effectively overcome the quality problems of folds and the like when being wound because the fiber does not have ductility, and effectively eliminate the problem of weakening and enhancing effect possibly caused by gaps due to the staggered arrangement of the gaps of different fiber layers; (3) particularly, the cold fiber base band is coated by the hot-melt plastic band to form the reinforced composite band, and then the reinforced composite band is wound, so that the fiber base band is not required to be heated independently, the fiber base band can effectively cool the hot-melt plastic band, the problem that the plastic band is too thick and is difficult to dissipate heat to cause the deformation of the hot-melt plastic band during winding is effectively solved, and in addition, the combination stability between the fibers and plastics can be further enhanced; (4) the tube wall is formed by adopting multi-layer fusion so that the production of the fiber reinforced tube wall with any thickness is possible, the number of the applicable reinforced composite strips can be adjusted according to the requirements of the tube diameter and the internal pressure, and the production can be realized without excessively changing equipment;
in a word, the invention can effectively improve the production efficiency of the high-strength pipe and save the production cost; the pipe wall of the pipe is scientific and reasonable in structure, convenient to produce and manufacture, obvious in cost performance, excellent in industrial practicability and huge in market prospect.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (19)
1. The utility model provides a compound winding pipe wall of fibre overlap reinforced plastics which 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 distributed on the radial section of the pipe wall at intervals in concentric circles, and the fiber layers are formed by respectively winding fiber base bands through the winding equipment.
2. The fiber-overlapped reinforced plastic composite wound pipe wall of claim 1, wherein the fiber base tapes of each fiber layer are wound in a non-overlapping manner with adjacent sides, gaps are left between the adjacent sides of the fiber base tapes, and the gaps of any one fiber layer and the gaps of another adjacent fiber layer in the pipe wall are in a staggered arrangement.
3. The fiber-overlapped reinforced plastic composite winding pipe wall as claimed in claim 2, wherein the fiber base tape is a reticular fiber base tape, and is a strip soft tape formed by interlacing fiber warps and wefts which are made of the same material or different materials and thermally molding the fibers in the plastic thin layer; the thermoplastic material of the reticular fiber base band and the plastic band are the same material or the material which can be mutually bonded after hot melting.
4. The fiber-overlapped reinforced plastic composite winding pipe wall as claimed in claim 3, wherein the reticular fiber base band is placed in the hot-melt plastic band inner core through an over-mold in a cooling state to form a reinforced composite band, the reinforced composite band is wound in parallel through a winding device in the hot-melt state to form a reinforced wall with a single fiber layer, and the pipe wall is formed by overlapping and fusing a plurality of layers of reinforced walls.
5. The fiber-overlapped reinforced plastic composite wrapped pipe wall of claim 4, wherein each of the composite reinforcing tapes is welded against each other by the hot melt adhesive of the adjacent side edges of the tapes during the wrapping process, and the welding-against portions are fiber-free joint portions.
6. The utility model provides a compound winding tubular product of fibre overlap reinforced plastics which 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 reinforced 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 bands on inner cores of the strips through the plastic strips; the fiber base band is a strip soft band formed by thermoplastic molding of fibers in a plastic thin layer, and the thermoplastic material and the plastic band material are the same material or are made of materials which can be mutually bonded after hot melting.
7. The composite wound tube material of claim 6, wherein the fiber base tape is a net-shaped fiber base tape, and is a strip-shaped soft tape formed by interlacing fiber warps and wefts and thermally molding the fibers in a plastic thin layer, and the fiber warps and wefts are fibers of the same or different materials.
8. The fiber-overlapped reinforced plastic composite wound pipe of claim 7, wherein the reinforced composite tapes are welded by abutting the adjacent side edges against each other during winding, and the abutting welding part is a fiber-free part.
9. The composite winding pipe material of fiber-overlapped reinforced plastic as claimed in claim 8, wherein the reinforced walls are two or more layers, and the fiber-free connection portions between adjacent reinforced walls are staggered.
10. The fiber-overlapped reinforced plastic composite wound pipe of claim 9, wherein adjacent reinforcing walls are fused directly on top of each other.
11. The fiber-overlapped reinforced plastic composite wound pipe of claim 9, wherein the adjacent reinforced walls are separated by non-reinforced walls formed by plastic strips of non-reinforced composite strips, and the reinforced walls are fused with the adjacent non-reinforced walls in an overlapping manner.
12. The fiber-overlapped reinforced plastic composite wound pipe according to any one of claims 6 to 11, wherein the outer wall of the pipe is further wound with high ribs for enhancing the rigidity of the pipeline ring.
13. The fiber-overlapped reinforced plastic composite winding pipe material as claimed in any one of claims 6 to 11, wherein the outer wall of the pipe material is further wrapped with a plastic smooth layer uniformly wrapped by a wrapping mold.
14. A method of manufacturing a fiber-overlapped reinforced plastic composite wound pipe, characterized in that: utilize many plastic strips to pass through the pipe winding equipment winding stack to fuse the pipe wall of shaping tubular product, have two strips at least for the compound strip of reinforcing in many plastic strips, the inner core cladding of the compound strip of reinforcing has the fibre baseband, the fibre baseband is the long-strip soft area that the fibre thermoplasticity formed in the plastics thin layer, the material of thermoplasticity material and plastic strip adopts the same material or has the material that both can bond each other after the hot melt.
15. The method for manufacturing the composite winding pipe material of fiber-overlapped reinforced plastic as claimed in claim 14, wherein the reinforced composite tape material is made by using an enveloping mold, the plastic is extruded from the periphery of the enveloping mold in a hot-melt state, the fiber base tape in a cooling state enters the inner core of the hot-melt plastic tape material from the hollow position of the enveloping mold, and the plastic thin layer on the fiber base tape is hot-melted by receiving the high temperature from the hot-melt plastic tape material, so that the fiber base tape material is integrally fused with the inner core of the plastic tape material.
16. The method of claim 15, wherein the fiber base tape is thermoplastic in the plastic layer by interlacing fiber warps and wefts, and the fiber warps and wefts are fibers of the same or different materials.
17. The method of any one of claims 14 to 16, wherein the reinforced composite tape is welded to the adjacent side edges during winding, the welded portion is a fiber-free portion, so that the fiber base tape of the core of the reinforced composite tape has a gap between the adjacent side edges when the tape is wound to ensure that the fiber base material does not overlap with each other and crease.
18. The method of claim 17, wherein when a plurality of reinforcing composite tapes are wound, the reinforcing composite tapes are wound in a staggered manner, so that the non-connecting portions of the fibers formed by winding two different reinforcing composite tapes which are adjacent to each other up and down are staggered.
19. The method for manufacturing the fiber-overlapped reinforced plastic composite winding pipe material as claimed in claim 17, wherein the outer wall of the pipe material is further wrapped with a plastic smooth layer, and the plastic smooth layer is used for uniformly wrapping the outer wall of the pipe material integrally by using a wrapping mold through a wrapping process.
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| CN202210530702.5A CN114893626B (en) | 2022-05-16 | 2022-05-16 | Fiber-overlapped reinforced plastic composite winding pipe wall, pipe and manufacturing method |
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| JPH0516262A (en) * | 1990-11-30 | 1993-01-26 | Sekisui Chem Co Ltd | Manufacture of fiber-reinforced thermoplastic resin tube |
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