CN111197670A - Fiber reinforced composite material and metal composite pipe - Google Patents
Fiber reinforced composite material and metal composite pipe Download PDFInfo
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- CN111197670A CN111197670A CN201811366010.1A CN201811366010A CN111197670A CN 111197670 A CN111197670 A CN 111197670A CN 201811366010 A CN201811366010 A CN 201811366010A CN 111197670 A CN111197670 A CN 111197670A
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- 239000000463 material Substances 0.000 title claims abstract description 51
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- 230000001681 protective effect Effects 0.000 claims abstract description 15
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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
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
-
- 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
- F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
- F16L3/02—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets partly surrounding the pipes, cables or protective tubing
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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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention discloses a fiber reinforced composite material and metal composite pipe, which comprises a metal lining pipe, wherein metal joints are arranged at two ends of the metal lining pipe, the fiber reinforced composite material pipe is arranged at the periphery of the metal lining pipe, a conical surface is arranged on the metal joints, the distance between the conical surface and the axis of the metal lining pipe is gradually increased along the end part of the metal lining pipe to the central direction, at least one circle of fixing pins are fixedly arranged on the conical surface, the number of the fixing pins in the same circle is multiple and is uniformly arranged, the end part of the fiber reinforced composite material pipe is wound on the fixing pins, and an outer protective sleeve for pressing the fiber reinforced composite material pipe is arranged at the periphery of the fixing pins. Wherein, the outer protective sheath preferably adopts two semicircle branch cover and passes through the fastener and connect as an organic whole. The invention has the advantages of high safety and reliability, capability of transmitting higher torque and axial stress, easiness in processing and manufacturing and the like.
Description
Technical Field
The invention relates to a composite pipe fitting, in particular to a fiber reinforced composite material and metal composite pipe.
Background
Compared with metal materials, the fiber reinforced composite material has the advantages of specific strength, specific modulus and the like, is applied more and more widely, and particularly has the weight reduction requirement in the fields of aerospace, vehicles and the like. Generally, equipment and parts have multiple working condition application requirements, and complex working condition requirements are difficult to meet by a single material, so that multiple materials are required to be combined to form a composite part. Based on the stress and working environment characteristics of the fiber reinforced composite material pipeline, the composite material pipeline is most suitable for tensile stress and corrosion-resistant environments. Therefore, the pipeline is combined with a metal material pipeline with the functions of corrosion resistance, wear resistance and the like, and has wide application prospect in the field of conveying single-phase or multi-phase (including double-phase) materials of gas, liquid and solid under the working conditions of internal pressure, corrosion resistance and wear resistance, such as a concrete conveying pipe of a concrete pump truck, a drill pipe of a drilling system, a corrosion-resistant alloy pipe in the petrochemical industry and the like.
Concrete pump trucks have the characteristics of flexible construction, high efficiency and the like, and are popular. For a user, flexible movement of the pump truck during construction on a construction site, pumping reaching height and length, efficient construction, safety, reliability and trafficability are more concerned. To realize flexible movement, the length of the vehicle, the number of axles and the length of the supporting legs need to be reduced; in order to realize the pumping to reach the height and the length, the length of the arm support of the pump truck needs to be increased; to realize efficient construction, the pressure of pumping concrete and the diameter of a pipeline need to be increased; in order to realize safety and reliability, the breakage of a plurality of high-strength steel structural members of the pump truck needs to be prevented; to achieve good throughput, it is desirable to reduce vehicle length, height, width and number of axles. The light weight technology, which is a key technology for designing and manufacturing the pump truck, can be used for reducing the number of axles, increasing the length of the arm support and improving the anti-tipping capacity of the vehicle under the same weight. In addition, the concrete conveying pipe conveys concrete to a corresponding position at a certain flow speed under certain pressure. The concrete consists of coarse aggregate (cobblestone and gravel), fine aggregate (natural sand and machine-made sand), cement and other additives. Therefore, the conveying pipe needs to bear pressure and scouring abrasion of the concrete aggregate.
Because of its inherent disadvantages (e.g., low shear strength, low elastic modulus, fiber brittleness, etc.), the fiber-reinforced composite pipe is not connected as effectively (e.g., welded, flanged, screwed, etc.) as metal pipes (e.g., steel, aluminum, and alloys, titanium, and alloys, etc.), so the composite pipe is usually first connected to a metal joint, and then the metal joint is connected to the metal joint by a clamp, a bolt, a screw, a welding, etc. to form a piping system. Chinese patent document CN 103115200B discloses a double-layer concrete conveying pipe with an outer layer of fiber reinforced composite material and an inner layer of steel, which mainly comprises a main pipe, a flange and a fiber composite material layer, wherein the flange comprises a connecting pipe with a sawtooth part and an end flange plate, the flange and the main pipe form a welding part by spot welding, and the fiber composite material layer is connected into a whole by the sawtooth part of fiber winding on the connecting pipe. In theory, the joint can bear large axial tension load, but in practice, the operation of winding fibers is inconvenient, and the fibers are easy to fall off, particularly when the flange needs to bear bending and twisting loads at the same time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the fiber reinforced composite material and the metal composite pipe which have high safety and reliability, can transmit higher torque and axial stress and are easy to process and manufacture.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a fibre reinforced composite and metal composite pipe, includes the interior bushing pipe of metal, the interior bushing pipe both ends of metal are equipped with metal joint and the interior bushing pipe periphery of metal is equipped with fibre reinforced composite pipe, the last circular conical surface that is equipped with of metal joint, and follows the tip of the interior bushing pipe of metal is to central direction, the circular conical surface with the distance in the axle center of the interior bushing pipe of metal increases gradually, set firmly at least round fixed pin on the circular conical surface, the quantity of fixed pin is a plurality of and evenly arranges in the same round, fibre reinforced composite pipe tip twine in on the fixed pin, the fixed pin periphery is equipped with and is used for compressing tightly the outer protective sheath of fibre reinforced composite pipe. Wherein, the outer protective sheath preferably adopts two semicircle branch cover and passes through the fastener and connect as an organic whole.
As a further improvement of the above technical solution: the fiber layer number of the fiber reinforced composite pipe is N1The number of turns of the fixing pin is N2Then 2 is not more than N2≤N1Two adjacent circles of the fixing pins are staggered with each other, the difference between the staggered angle and the fiber winding angle is not more than +/-10 degrees, and the included angle between the conical surface and the axis of the metal lining pipe is β degrees1When the angle is less than or equal to 2 degrees, β1The number of the fixing pins is required to be related to the number of the fiber layers to increase the number of the fixing pins, so that the stress is favorably shared, the number of the fixing pins is increased, the number of the fixing pins is staggered by a certain angle, the capacity of transmitting torque and resisting distortion is favorably improved, the number of the fixing pins in each circle is determined according to the density and the angle of single-layer wire arrangement, the number of the fixing pins is preferably 6-45, and the specific included angle between the conical surface and the axis of the metal lining pipe is β1Is favorable for transmitting torque and axial tension, and the further preferred value is 2-8 degrees.
As a further improvement of the above technical solution: the metal joint is simple in structure and easy to process, and the manufacturing cost is reduced; or the fixing pin can be directly welded on the conical surface to realize the fixed connection of the fixing pin and the metal joint.
As a further improvement of the above technical solution: the fiber of each layer of the fiber reinforced composite material pipe is alternately distributed at + 45-60 degrees, 90 degrees, -45-60 degrees and 90 degrees along the axial direction of the metal lining pipe, or alternatively distributed at-45-60 degrees, 90 degrees, -45-60 degrees and 90 degrees along the axial direction of the metal lining pipe, and the sum of the thicknesses of the fiber layers of the + 45-60 degrees of distribution and the-45-60 degrees of distribution is t45The sum of the total number of layers x the thickness of a single layer and the thickness of each 90-degree cloth silk fiber layer is t90(Total layer)Several x monolayer thick), then 1.5 is less than or equal to t45/t90Less than or equal to 2.0. The radial load of the pipeline on the pipe wall is about 2 times of the axial load according to the internal pressure. The wire laying direction in the limiting reinforced composite material has important influence on the tensile stress, the tensile strength of the wire laying at 0 degree with the tensile stress direction is ten times or even dozens of times of that of the wire laying at 90 degrees, the tensile stress in two directions is almost equal when the wire laying at 45 degrees is carried out, but the wire laying at 0 degree and the wire laying at 90 degrees can bring the stress concentration problem. Based on this, for the pressure-bearing pipeline, the reasonable silk direction should adopt and should be close to 90 degrees and nearly 45 degrees alternative silk with the body axial to optimally realize that the body radial tension is twice of axial tensile strength, optimize the thickness of fibre reinforced composite pipe.
As a further improvement of the above technical solution: the metal lining pipe comprises a main pipe, a wear-resistant pipe and two wear-resistant sleeves, the wear-resistant pipe and the wear-resistant sleeves are superior to the wear-resistant performance of the main pipe, the outlet end of the wear-resistant pipe is in conical sleeve joint with the inlet end of the main pipe, the two wear-resistant sleeves are respectively in butt joint with the outlet end of the main pipe and the inlet end of the wear-resistant pipe, one of the wear-resistant pipes is sleeved with the metal joint, the periphery of the wear-resistant sleeves at the inlet ends of the wear-resistant pipe and the wear-resistant pipe is sleeved with the other metal joint, the periphery of the wear-resistant sleeves at the outlet ends of the main pipe and the main pipe is sleeved with the metal joint, and the. The greatest demand for lightweight wear resistant pipes is for aerial work machines, such as pump trucks. Influenced by the erosive wear of the flowing concrete, the wear of the pipeline inlet section within the range of 200mm is more severe, the service life is shorter, and therefore the service life of the whole pipeline can be prolonged by locally using a more wear-resistant material, and the cost performance is improved. For example, the super wear-resistant pipe is made of die steel or martensitic stainless steel, such as Cr12, Cr12MoV, Cr5Mo, 4Cr13 or 9Cr18, the main pipe is made of bearing steel, such as GCr15, and the wear-resistant sleeve is made of high-chromium cast iron, hard alloy and the like which are more wear-resistant than the main pipe; a connecting flange can be arranged on the metal joint to be used as an interface with other pipelines, and the interface meets A, B, C type flanges in the building industry standard of JB/T11187 building construction machinery and equipment concrete conveying pipe type and size in the field of concrete conveying pipes.
As a further improvement of the above technical solution: the total length of the wear-resistant pipe and the wear-resistant sleeve at the inlet end is L1The lengths of the wear-resistant pipe and the main pipe extending into the corresponding metal joints are L2The sleeve length of the conical sleeve is L3L is more than or equal to 60mm1≤200mm、3mm≤L2≤60mm、3mm≤L3Less than or equal to 15 mm. Further preferably 10 mm. ltoreq.L2≤30mm、5mm≤L3≤8mm。
As a further improvement of the above technical solution: the metal inner lining pipe comprises a main pipe and two wear-resistant sleeves, the two wear-resistant sleeves are respectively butted with two ends of the main pipe, a thickening pipe is sleeved on the periphery of the inlet end of the main pipe, one metal joint is sleeved on the peripheries of the thickening pipe and the corresponding wear-resistant sleeve, the other metal joint is sleeved on the peripheries of the main pipe and the corresponding wear-resistant sleeve, and the metal joint and the thickening pipe and the metal joint and the main pipe are in interference fit or are glued; or the entry end and the exit end periphery of being responsible for all overlap and be equipped with the thickening pipe, the metal joint cover is located thickening pipe and the wear-resisting cover periphery that corresponds, adopt interference fit or sticky between metal joint and the thickening pipe. The greatest demand for lightweight wear resistant pipes is for aerial work machines, such as pump trucks. Influenced by the erosive wear of flowing concrete, the pipeline entry section within 200mm wearing and tearing are more violent, and life is shorter, consequently can adopt local thickening to improve whole pipe life, improves the price/performance ratio, for example both ends thickening or only entry end thickening, thickening pipe accessible cold charge realizes that interference fit embolias to be responsible for and wear-resisting cover periphery.
As a further improvement of the above technical solution: the metal joint is sleeved on the periphery of the metal lining pipe, and two ends of the metal joint and the metal lining pipe are sealed through sealing welding seams; or the metal joint is butted with the metal lining pipe through a penetration welding seam. The design principle of the corrosion-resistant pipeline is basically the same as that of the wear-resistant pipeline, only the material of the metal lining pipeline is different from the connection structure of the metal joint, the metal lining pipe can be inserted into the metal joint and sealed by adopting two seal welding seams, and the connection mode of the metal joint can also adopt a A, B, C type flange in the building industry standard of JB/T11187 construction machinery and equipment concrete delivery pipe type and size; or the metal lining pipe and the metal joint are subjected to butt fusion welding, and the metal joint can also adopt the connection mode. If the conveying medium is only corrosive, the metal lining pipeline metal joint can be made of corrosion-resistant metal materials such as stainless steel, nickel-based alloy, titanium alloy and the like according to the corrosive medium; if the conveying medium is corrosive and has a wear medium, wear-resistant and corrosion-resistant metal materials such as martensitic stainless steel and the like can be adopted. The composite pipe made of the fiber reinforced composite material and the corrosion-resistant metal material can greatly reduce the manufacturing cost of the pipeline, and the small-caliber pipeline is connected by the B-type flange, so that the field installation is convenient; the large-diameter pipeline is connected by the C-shaped flange, so that the construction cost is greatly reduced and the work efficiency is improved compared with the field welding.
As a further improvement of the above technical solution: the fiber reinforced composite and the metal composite pipe further comprise a pipe fitting fixing assembly, the pipe fitting fixing assembly comprises a U-shaped bolt and a rubber cushion pad, a groove is formed in the rubber cushion pad, and the U-shaped bolt is clamped in the groove. For wear resistant pipes, increasing the wear resistance of the wear resistant material and increasing the thickness of the wear resistant material are the most effective ways to extend the life of the pipe. The wall thickness of the pipeline is increased by the delivery pipe of the pump truck, and if the inner diameter is reduced, the flow speed is increased and the pressure is increased; the outer diameter is increased, so that the pumping efficiency of the concrete is not influenced. The inner diameter of the U-shaped fixing piece of the existing patent and practical application product is relatively fixed, a 1-2mm gap is reserved between the U-shaped fixing piece and the conveying pipe, and forced assembly is frequently caused due to machining errors and the like. The invention adjusts the inner diameter of the whole pipe fitting fixing component by utilizing the thickness change of the rubber cushion pad of the U-shaped bolt, thereby not only realizing the flexible adaptation to the increase of the outer diameter of the conveying pipe, but also reducing the manufacturing difficulty and the cost of the pipe fitting fixing component. As a preferred technical scheme: the outer diameter of the concrete conveying pipe changes once every 2-4mm from 133mm, the size of the U-shaped bolt is kept unchanged, matching is achieved through the thickness change of the rubber buffer cushion, for example, one model is determined every 1.5mm, and the material is fiber reinforced rubber.
Compared with the prior art, the invention has the advantages that: the invention discloses a fiber reinforced composite material and a metal composite pipe.A metal joint is provided with a conical surface, the distance between the conical surface and the axis of the metal lining pipe is gradually increased along the end part of the metal lining pipe towards the center direction, at least one circle of fixing pins are arranged on the conical surface, the number of the fixing pins in the same circle is multiple and is uniformly arranged along the circumferential direction, fiber wires are wound on the fixing pins, and the fiber reinforced composite material pipe is tightly pressed by an outer protective sleeve and is tightly attached to the metal joint; or a plurality of circles of bosses are arranged on the metal joint at intervals, a plurality of circles of bosses are arranged on the fiber reinforced composite material pipe at intervals, the bosses are in concave-convex fit with the bosses, the fiber reinforced composite material pipe is tightly pressed by using an outer protective sleeve to be tightly attached to the metal joint, and the tensile stress and the torsional stress of the fiber reinforced composite material pipe are directly transmitted to the metal joint; it can transmit the moment of torsion and the axial atress equivalent with the body, and outer protective sheath also can effectively protect droing of fibre reinforced composite pipe and metal joint simultaneously, and the fixed pin also can avoid damaging fragile cellosilk and lead to the fracture, has improved the safety, the reliability of composite pipe.
The utility model provides a fibre reinforced composite and metal composite pipe, includes the interior bushing pipe of metal, the interior bushing pipe both ends of metal are equipped with the metal joint, and the interior bushing pipe periphery of metal is equipped with fibre reinforced composite pipe, the interval is provided with many rings of boss on the metal joint, and the quantity of boss is a plurality of and evenly arranges in the same circle, the interval is provided with many rings of bellying on the fibre reinforced composite pipe, many rings of bellying and many rings of boss unsmooth cooperation, the boss periphery is equipped with and is used for compressing tightly the outer protective sheath of fibre reinforced composite pipe.
Drawings
Fig. 1 is a schematic front view of a first embodiment of the fiber-reinforced composite material and metal composite pipe of the present invention.
Fig. 2 is a schematic structural view of a first embodiment of a metal joint in the present invention.
Fig. 3 is a schematic structural view of a second embodiment of the metal joint of the present invention.
Fig. 4 is a view a-a of fig. 3.
Figure 5 is a schematic view of the outer protective sheath of the present invention.
Fig. 6 is a schematic structural view of a first embodiment of the present invention used as a wear resistant pipe.
Fig. 7 is a schematic structural view of a second embodiment of the present invention used as a wear resistant conduit.
Fig. 8 is a schematic structural view of a third embodiment of the present invention for use as a wear resistant conduit.
Fig. 9 is a schematic structural view of a first embodiment of the present invention used as a corrosion resistant pipe.
Fig. 10 is a schematic structural view of a second embodiment of the present invention used as a corrosion resistant pipe.
Fig. 11 is a schematic structural view of the pipe fixing assembly according to the present invention.
Fig. 12 is a view B-B of fig. 11.
Fig. 13 is a schematic front view of a second embodiment of the fiber-reinforced composite material and metal composite tube of the present invention.
The reference numerals in the figures denote: 1. a metal liner tube; 11. a main pipe; 12. a wear resistant tube; 13. a wear-resistant sleeve; 14. thickening the tube; 15. sealing the weld; 16. penetration of the weld; 2. a metal joint; 21. a conical surface; 22. a fixing pin; 23. a boss; 3. a fiber reinforced composite tube; 31. a boss portion; 4. an outer protective sheath; 5. a tube fitting securing assembly; 51. a U-shaped bolt; 52. a rubber cushion pad; 53. and (4) a groove.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples of the specification.
Fig. 1 to 12 show a first embodiment of a fiber-reinforced composite and metal composite pipe according to the invention, in which:
The outer surface of the outer interface end of the metal joint 2 is a conical surface 21, the conical surface 21 forms an angle of β 1 degrees with the axis, the angle a1 is larger than or equal to 2 degrees and smaller than or equal to 30 degrees, preferably the angle a1 is larger than or equal to 2 degrees and smaller than or equal to 8 degrees, blind holes with the number of N2 circles (or called turns) perpendicular to the axis are distributed on the conical surface 21, each blind hole is filled with a fixing pin 22 in an interference fit mode, the angle N2 is larger than or equal to 1 and smaller than or equal to N1(N1 is the number of fiber winding layers), preferably the angle N2 is larger than or equal to 2 and smaller than or equal to N1, the number of the circles of the blind holes is preferably 6-45 (including end point values), the staggered angle of the blind holes between the circles and the fiber winding angle is not larger than +/-10 degrees.
The periphery that fibre reinforced composite pipe 3 and metal joint 2 combined together adopts two semicircle outer protective sheaths 4 to fasten through 6 locking nut spare, further prevents that fibre reinforced composite pipe 3 and metal joint 2 from droing. The metal lining pipe 1 is made of wear-resistant materials (such as bearing steel, tool steel, high-carbon steel, die steel, medium-high chromium cast iron and the like, the low-temperature tempering hardness of which can reach HRC 58-67 steel or cast iron after quenching) or corrosion-resistant materials (such as stainless steel, nickel-based alloy, copper alloy, aluminum alloy and other corrosion-resistant steel or nonferrous metal) or metal pipes made by adopting a wear-resistant corrosion-resistant surface treatment mode.
Used as wear-resistant pipeline
The greatest demand for lightweight wear resistant pipes is for aerial work machines, such as pump trucks. The influence of the scouring wear of the flowing concrete causes the wear of the pipeline inlet section within the range of 200mm to be more severe and the service life to be shorter, so that the service life of the whole pipeline is prolonged by adopting local thickening or adopting a more wear-resistant material, the cost performance is improved, and particularly, the concrete steps can be seen in fig. 4-6.
In the first embodiment, the wear-resistant pipe 12 at the inlet section of the main pipe 11 is made of die steel or martensitic stainless steel, such as Cr12, Cr12MoV, Cr5Mo, 4Cr13 or 9Cr18, and the main pipe 11 is made of bearing steel, such as GCr 15. The main pipe 11 and the wear-resistant pipe 12 are connected in a matching way by adopting a taper sleeve, the length of the taper surface is more than or equal to 3mm and less than or equal to L3 and less than or equal to 15mm, and preferably, more than or equal to 5mm and less than or equal to L3 and less than or equal to 8 mm. The total length of the wear-resistant pipe 12 and the wear-resistant sleeve 13 is more than or equal to 60mm and less than or equal to L1 and less than or equal to 200mm (applicable to all wear-resistant pipelines of the invention); the length of the main pipe 11 and the wear-resistant pipe 12 which are respectively inserted into the corresponding metal joints 2 is more than or equal to 3mm and less than or equal to L2 and less than or equal to 60mm, preferably more than or equal to 10mm and less than or equal to L2 and less than or equal to 30mm, and the main pipe and the wear-resistant pipe are in interference fit or strong adhesion or both in interference fit and strong adhesion (applicable to all wear-resistant pipelines of the; the wear-resistant sleeve 13 is made of high-chromium cast iron and hard alloy which are more wear-resistant than the main pipe 11; the metal joint 2 can be provided with a flange which is used as an interface with other pipelines, and the interface accords with A, B, C type flanges (applicable to all wear-resistant pipelines of the invention) in the building industry standard of JB/T11187 construction machinery and equipment concrete delivery pipe type and size in the field of concrete delivery pipes.
In the second embodiment, the L1 section and the outlet section of the main pipe 11 both adopt a local thickening design principle, and the difference from the first embodiment is that the thickened pipe 14 is directly sleeved on the outer wall of the main pipe 11 in an interference fit manner through cold fitting; in the third embodiment, only the L1 section of the main pipe 11 is designed to be locally thickened, so that the cost of the second embodiment is lower than that of the first embodiment, the cost of the third embodiment is lower than that of the second embodiment, the structure of the wear-resistant sleeve 13 can be further simplified to reduce the cost, and the shape and the size of the connecting flange on the metal joint 2 are correspondingly changed in order to adapt to the change of the wear-resistant sleeve 13.
Used as corrosion-resistant pipeline
The principle of the corrosion-resistant pipeline design is basically the same as that of the wear-resistant pipeline design, and only the metal lining pipe 1 and the metal joint 2 are slightly different, specifically referring to fig. 7 to 8.
In the first embodiment of the corrosion-resistant pipe, the main pipe 11 (i.e., the metal lining pipe 1) is inserted into the metal joint 2, and is sealed by two seal-weld seams, and the connection mode of the flange arranged on the metal joint 2 may also be A, B, C type flange in the building industry standard of JB/T11187 type and size of concrete delivery pipes for building construction machinery and equipment.
In the second embodiment of the corrosion-resistant pipe, the main pipe 11 (i.e., the metal lining pipe 1 in this case) and the metal joint 2 are butt-fusion welded, and the flange provided on the metal joint 2 may be the same as that of the first embodiment.
If the conveying medium is only corrosive, the main pipe 11 and the metal joint 2 can be made of corrosion-resistant metal materials such as stainless steel, nickel-based alloy, titanium alloy and the like according to the corrosive medium; if the conveying medium is corrosive and has a wear medium, wear-resistant and corrosion-resistant metal materials such as martensitic stainless steel and the like can be adopted.
The composite pipe made of the fiber reinforced composite material and the corrosion-resistant metal material can greatly reduce the manufacturing cost of the pipeline, and the small-caliber pipeline is connected by the B-type flange, so that the field installation is convenient; the large-diameter pipeline is connected by the C-shaped flange, so that the construction cost is greatly reduced and the work efficiency is improved compared with the field welding.
For wear resistant pipes, increasing the wear resistance of the wear resistant material and increasing the thickness of the wear resistant material are the most effective ways to extend the life of the pipe. The wall thickness of the pipeline is increased by the delivery pipe of the pump truck, and if the inner diameter is reduced, the flow speed is increased and the pressure is increased; the outer diameter is increased, so that the pumping efficiency of the concrete is not influenced. In the prior art, the inner diameter of the U-shaped fixing piece is relatively fixed, a 1-2mm gap is reserved between the U-shaped fixing piece and the conveying pipe, but forced assembly exists in many times during practical application due to machining errors and the like.
The invention adjusts the inner diameter of the whole pipeline fixing component 5 by utilizing the thickness change of the rubber buffer pad 52 of the U-shaped bolt 51, thereby not only flexibly realizing the adaptation to the increase of the outer diameter of the conveying pipe, but also reducing the manufacturing difficulty and the cost of the pipeline fixing component 5. The specific scheme is as follows: the pipe fixing assembly 5 comprises a U-shaped bolt 51 and a rubber cushion 52, a groove 53 is formed in the rubber cushion 52, the U-shaped bolt 51 is clamped in the groove 53, the U-shaped bolt 51 is kept unchanged, and the thickness of the rubber cushion 52 is changed. The outer diameter of the concrete pipe is changed every 2-4mm from 133mm, and the thickness of the rubber buffer 52 is preferably sized every 1.5mm and made of fiber reinforced rubber.
Method for manufacturing metal joint 2
The manufacturing method of the metal joint 2 comprises the following steps: sawing and blanking a steel pipe, turning two flat end faces, turning an interface end, turning an inverted conical surface (namely the conical surface 21), using the inverted conical surface to enable the surface of the metal joint 2 to be transited to the surface of the metal lining pipe 1, and using an inner diameter-a blind hole for installing a fixed pin 22 by a numerical control drill, and assembling the round pin column 22 in an interference fit manner (cold loading or mechanical loading can be adopted); or, the steel pipe is cut and blanked, the two flat end faces are turned, the interface end, the inverted conical surface (namely the conical surface 21) and the forward conical surface (the forward conical surface is used for enabling the surface of the metal joint 2 to be transited to the surface of the metal lining pipe 1) and the inner diameter are turned, and the fixing pin 22 is welded on the conical surface 21 of the metal joint 2 according to the drilling position by adopting stud welding, resistance welding and brazing.
The fixing pin 2 is purchased as a standard.
The advantages of this manufacturing method are: a) standard tools can be adopted for processing, and numerical control drilling is adopted, so that the efficiency is high, and the cost is low; b) the fixed pin 22 is manufactured and purchased in a standardized way, has low cost and is not easy to damage fibers; c) the interference fit cold charge, it is efficient, the structure is reliable.
Method for manufacturing wear-resistant pipeline
The metal joint 2 is manufactured as described above, and other steps are as follows:
a. the main pipe 11 adopts seamless pipe or welded pipe to cut and blank, the conical surface is matched with the required machine processing,
b. heat treatment, quenching and tempering, wherein after the heat treatment, the pipe body has high hardness and certain toughness and fatigue life,
c. the main pipe body is assembled, the conical surface is matched with or is externally provided with a wear-resistant sleeve,
d. casting and molding a high-chromium cast iron type wear-resistant sleeve, performing heat treatment after machining a die steel and bearing steel machine, sintering and molding a hard alloy type,
e. under the inner core tooling, the metal joint 2, the wear-resistant sleeve 12 and the main pipe 11 are integrated, the whole length error is controlled within the range of +/-1 mm,
f. weaving fibers, wherein the first layer is woven by plus 45 degrees along the axial direction of the main pipe 11, the second layer is woven by 90 degrees, the third layer is woven by minus 45 degrees, the fourth layer is woven by 90 degrees, the fifth layer is woven by plus 45 degrees, and if the number of layers is further increased, the circulation is carried out, and the weaving is carried out at the positions of the head and tail metal joints 2 to ensure that the fibers are wound and fastened on the round pin column 22 and are tightly matched with the conical surface 21; the number of the layers of the cloth yarn is related to the size of the yarn bundle, and can be increased or reduced, but t is required to be more than or equal to 1.545/t90≤2.0，
g. The fiber cloth is wound outside, in order to ensure the appearance of the pipe fitting, a layer of fiber cloth can be wound on the periphery of the fiber reinforced composite material pipe 3,
h. curing the resin, heating the pipe in a curing room at the temperature of 130-160 ℃ for 30-60 minutes,
i. and (4) appearance treatment, wherein the pipe fitting needing paint is polished and then painted, and the pipe fitting without paint is polished, finished, provided with the outer protective sleeve 4 and then put in storage.
Method for manufacturing corrosion-resistant and wear-resistant pipeline
As described above, the metal terminal 2 is manufactured by the following steps:
a. the main pipe 11 is cut and blanked, the pipe body which needs wear resistance and corrosion resistance also needs heat treatment,
b. the main pipe 11 and the metal joint 2 are riveted and welded into a whole,
c. filament winding braiding (same as above);
d. wrapping fiber cloth (same as above);
e. resin curing (same as above);
f. appearance treatment (in the same year)
Method for manufacturing pipe fixing assembly 5
Manufacturing method of U-bolt 51:
a. round steel sawing blanking
b. The threads at the two ends are machined and processed,
c. hot-rolling (or cold-rolling) and realizing bending,
d. the surface of the zinc plating is treated,
method for manufacturing rubber cushion 52:
the fiber reinforced rubber is adopted, after rubber mixing, the rubber is molded and vulcanized, the thickness t of the bottom of the rubber is manufactured at intervals of 1.5mm and the like, and the rubber has the same length.
The fiber reinforced composite material is greatly influenced by fiber arrangement, and the tensile strength along the length direction of the fiber is high and is ten times or even dozens of times higher than that in the vertical direction; the fibers are connected through resin or other high polymer materials, so that the shear modulus is low; therefore, the fiber is reasonably arranged according to the stress characteristics, and the fiber reinforced composite material becomes a key technology for designing and manufacturing the fiber reinforced composite material.
According to the invention, the radial stretching of the pipe body is twice of the axial stretching strength by optimizing the wire distribution of the composite material pipe, so that the thickness of the fiber reinforced composite material pipe 3 is minimized; the fiber wire is directly wound on the metal joint 2, the tensile stress of the single wire is transmitted to the round pin column 22, the round pin column 22 is transmitted to the metal joint 2, the axial bearing tensile stress capacity of the fiber wire is basically consistent with that of a pipe body, an outer metal protective sleeve is additionally arranged, and the fiber reinforced composite material pipe 3 and the metal joint 2 are effectively prevented from falling off; the round pins 22 are arranged in an array, so that the torsional stress caused by the fiber reinforced composite material pipe 3 can be effectively transmitted, the connection strength between the fiber reinforced composite material pipe 3 and the metal joint 2 is ensured, and the safety and reliability of the composite pipe are improved.
In the wear-resisting function, the double-layer concrete conveying pipe made of GCr15 bearing steel with the thickness of 2.5mm and Q345 steel with the thickness of 2mm is adopted, C30 concrete can be conveyed to more than 5 ten thousand square, the selling price is 250 yuan/m, and the cost performance is about 150 yuan/ten thousand square. In the patent implementation case, GCr15 with the thickness of 4mm is used as an inner pipe, the amount of the concrete conveying formula converted into C30 can be more than 8 ten thousand, the selling price is 333 yuan/m, and the cost performance is about 125 yuan/ten thousand; if 2.5mm GCr15 bearing steel +2.5mm composite material pipe is adopted, under the same service life, the weight of the 3m pipe can be reduced from about 44Kg to 33Kg, the weight is reduced by about 11Kg, the weight is reduced by about 25%, the weight of the 60m long pump truck arm frame pipe can be reduced by about 220Kg, the contribution to the tilting moment can be up to about 6 t.m., and the light weight advantage can not be achieved by a full steel conveying pipe.
In the corrosion-resistant function, such as the oil and gas transmission field, a composite material with the thickness of 3-5mm is wound outside a 304 stainless steel inner pipe and a stainless steel joint, the tensile strength is about 600MPa, which is equivalent to the strength of X70 pipeline steel, the weight of each meter is reduced by 50%, and the corrosion-resistant protection can be realized without other external current, sacrificial anode protection cathode zinc-aluminum alloy blocks and the like.
Therefore, the fiber reinforced composite material and metal material composite pipe has the advantages of high cost performance, light weight, simplicity in maintenance and installation and the like in the field of gas-liquid-solid single-phase or multi-phase material conveying of wear-resistant materials, oil and gas conveying and the like, and has popularization value.
Fig. 13 shows a second embodiment of the fiber reinforced composite material and the metal composite pipe according to the present invention, which is substantially the same as the first embodiment, except that a plurality of circles of bosses 23 are provided on the metal joint 2 for connecting and fixing the fiber reinforced composite material pipe 3, a plurality of circles of protrusions 31 are provided on the fiber reinforced composite material pipe 3, and the fiber reinforced composite material pipe 3 and the metal joint 2 are engaged with each other in a concave-convex manner.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (10)
1. The utility model provides a fiber reinforced composite and metal composite pipe, bushing pipe (1) in the metal, bushing pipe (1) both ends are equipped with metal joint (2) in the metal, and bushing pipe (1) periphery is equipped with fiber reinforced composite pipe (3) in the metal, its characterized in that: be equipped with conical surface (21) on metal joint (2), and follow the tip of bushing pipe (1) in the metal is to central direction, conical surface (21) with the distance in bushing pipe (1) axle center in the metal increases gradually, set firmly at least round fixed pin (22) on conical surface (21), the quantity of fixed pin (22) is a plurality of and evenly arranges in the same round, fibre reinforced composite material pipe (3) tip twine in on fixed pin (22), fixed pin (22) periphery is equipped with and is used for compressing tightly outer protective sheath (4) of fibre reinforced composite material pipe (3).
2. The fiber-reinforced composite of claim 1With metal composite pipe, its characterized in that: the fiber layer number of the fiber reinforced composite material pipe (3) is N1The number of turns of the fixing pin (22) is N2Then 2 is not more than N2≤N1The fixing pins (22) are staggered mutually and the difference between the staggered angle and the fiber winding angle is not more than +/-10 degrees, and the included angle between the conical surface (21) and the axis of the metal lining pipe (1) is β degrees1When the angle is less than or equal to 2 degrees, β1≤30°。
3. The fiber reinforced composite and metal composite pipe of claim 1, wherein: the conical surface (21) is provided with a blind hole, and the fixing pin (22) is arranged in the blind hole and is in interference fit with the blind hole; or the fixing pin (22) is welded to the conical surface (21).
4. The fiber reinforced composite and metal composite pipe of claim 1, wherein: the fiber of each layer of the fiber reinforced composite material pipe (3) is alternately arranged at plus 45 degrees to 60 degrees, plus 90 degrees, minus 45 degrees to 60 degrees and plus 90 degrees along the axial direction of the metal lining pipe (1), or alternatively arranged at minus 45 degrees to 60 degrees, plus 90 degrees, minus 45 degrees to 60 degrees and plus 90 degrees to 90 degrees along the axial direction of the metal lining pipe (1), and the sum of the thicknesses of the fiber layers of the plus 45 degrees to 60 degrees and the minus 45 degrees to 60 degrees is t45The sum of the thicknesses of all 90-degree cloth silk fiber layers is t90And then t is not less than 1.545/t90≤2.0。
5. The fiber reinforced composite and metal composite tube of any one of claims 1 to 4, wherein: the metal lining pipe (1) comprises a main pipe (11), a wear-resistant pipe (12) and two wear-resistant sleeves (13), the wear-resisting property of the wear-resisting pipe (12) and the wear-resisting sleeve (13) is superior to that of the main pipe (11), the outlet end of the wear-resistant pipe (12) is in conical sleeve joint with the inlet end of the main pipe (11), the two wear-resistant sleeves (13) are respectively in butt joint with the outlet end of the main pipe (11) and the inlet end of the wear-resistant pipe (12), one metal joint (2) is sleeved on the peripheries of the wear-resistant pipe (12) and a wear-resistant sleeve (13) at the inlet end of the wear-resistant pipe (12), the other metal joint (2) is sleeved on the peripheries of the main pipe (11) and the wear-resistant sleeve (13) at the outlet end of the main pipe (11), interference fit or gluing is adopted between the metal joint (2) and the wear-resistant pipe (12) and between the metal joint (2) and the main pipe (11).
6. The fiber reinforced composite and metal composite tube of claim 5, wherein: the total length of the wear-resistant pipe (12) and the inlet end wear-resistant sleeve (13) is L1The lengths of the wear-resistant pipe (12) and the main pipe (11) extending into the corresponding metal joint (2) are L2The sleeve length of the conical sleeve is L3L is more than or equal to 60mm1≤200mm、3mm≤L2≤60mm、3mm≤L3≤15mm。
7. The fiber reinforced composite and metal composite tube of any one of claims 1 to 4, wherein: the metal inner lining pipe (1) comprises a main pipe (11) and two wear-resistant sleeves (13), the two wear-resistant sleeves (13) are respectively butted with two ends of the main pipe (11), a thickening pipe (14) is sleeved on the periphery of the inlet end of the main pipe (11), one metal joint (2) is sleeved on the peripheries of the thickening pipe (14) and the corresponding wear-resistant sleeve (13), the other metal joint (2) is sleeved on the peripheries of the main pipe (11) and the corresponding wear-resistant sleeve (13), and interference fit or adhesion is adopted between the metal joint (2) and the thickening pipe (14) and between the metal joint (2) and the main pipe (11); or the entry end and the exit end periphery of being responsible for (11) all are equipped with thickening pipe (14), metal joint (2) cover is located thickening pipe (14) and the wear-resisting cover (13) periphery that corresponds, adopt interference fit or sticky between metal joint (2) and thickening pipe (14).
8. The fiber reinforced composite and metal composite tube of any one of claims 1 to 4, wherein: the metal joint (2) is sleeved on the periphery of the metal lining pipe (1), and two ends of the metal joint (2) and the metal lining pipe (1) are sealed through sealing welding seams (15); or the metal joint (2) is butted with the metal lining pipe (1) through a penetration welding seam (16).
9. The fiber reinforced composite and metal composite tube of any one of claims 1 to 4, wherein: still include the fixed subassembly of pipe fitting (5), the fixed subassembly of pipe fitting (5) are including U type bolt (51) and rubber buffer pad (52), be equipped with recess (53) on rubber buffer pad (52), U type bolt (51) card is located in recess (53).
10. The utility model provides a fiber reinforced composite and metal composite pipe, bushing pipe (1) in the metal, bushing pipe (1) both ends are equipped with metal joint (2) in the metal, and bushing pipe (1) periphery is equipped with fiber reinforced composite pipe (3) in the metal, its characterized in that: the metal joint (2) are provided with many rings of bosses (23) at intervals, the quantity of boss (23) is a plurality of and evenly arranges in the same circle, the interval is provided with many rings of bellying (31) on fibre reinforced composite pipe (3), and many rings of bellying (31) and many rings of boss (23) unsmooth cooperation, boss (23) periphery is equipped with and is used for compressing tightly outer protective sheath (4) of fibre reinforced composite pipe (3).
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| CN201811366010.1A CN111197670A (en) | 2018-11-16 | 2018-11-16 | Fiber reinforced composite material and metal composite pipe |
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