CN111197670B - Fiber reinforced composite material and metal composite pipe - Google Patents
Fiber reinforced composite material and metal composite pipe Download PDFInfo
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- CN111197670B CN111197670B CN201811366010.1A CN201811366010A CN111197670B CN 111197670 B CN111197670 B CN 111197670B CN 201811366010 A CN201811366010 A CN 201811366010A CN 111197670 B CN111197670 B CN 111197670B
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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
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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
- 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, a 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 gradually increases along the direction from the end of the metal lining pipe to the center, 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 uniformly distributed, the end parts of the fiber reinforced composite material pipe are wound on the fixing pins, and an outer protective sleeve used for compacting the fiber reinforced composite material pipe is arranged at the periphery of the fixing pins. Wherein, the outer protective sleeve preferably adopts two semicircular sub-sleeves and is connected into a whole through a fastener. The invention has the advantages of high safety and reliability, high torque and axial stress transmission, easy 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, and the application is wider and wider, especially in the fields of aerospace, vehicles and the like with weight reduction requirements. In general, equipment and parts have various working condition application requirements, and complex working condition requirements are difficult to meet by single materials, so that various material combinations are needed to form a composite part. Based on the stress and working environment characteristics of the fiber reinforced composite material pipeline, the fiber reinforced composite material pipeline is most suitable for tensile stress and corrosion resistant environments. Therefore, the composite material is used in combination with metal material pipelines with functions of corrosion resistance, wear resistance and the like, and has wide application prospects in the field of conveying gas, liquid, solid single-phase or multiphase (including double-phase) materials under the working conditions of internal pressure, corrosion resistance and wear resistance, such as concrete conveying pipes of concrete pump trucks, drill pipes of drilling systems, corrosion-resistant alloy pipes in petrochemical industry and the like.
The concrete pump truck has the characteristics of flexible construction, high efficiency and the like, and is favored. For users, the flexible movement of the pump truck during construction at a construction site, the height and length of the pump truck reaching the construction site, efficient construction, safety, reliability and running passing performance are paid attention to. To achieve flexible movement, it is desirable to reduce the vehicle length, the number of axles, and the leg length; to achieve the height and length of pumping, the length of the pump truck arm frame needs to be increased; to achieve efficient construction, the pressure of the pumped concrete and the diameter of the pipe need to be increased; to realize safety and reliability, the pump truck needs to be prevented from being broken by a few large high-strength steel structural parts; to achieve good passability, it is desirable to reduce the vehicle length, height, width and number of axles. The key technology of pump truck design and manufacture, namely the light-weight technology, is not separated from the aspects, so that the number of axles can be reduced, the length of the arm support can be increased, and the anti-tipping capability of the vehicle can be improved under the same weight. In addition, the concrete delivery pipe delivers concrete to the corresponding location at a certain flow rate under a certain pressure. The concrete is composed of coarse aggregate (cobblestone and broken stone), fine aggregate (natural sand and machine-made sand), cement and other additives. Therefore, the conveying pipe is required to bear pressure and also to bear the scouring abrasion of the concrete aggregate.
Fiber reinforced composite pipe elements are often connected to metal fittings by means of clamps, bolts, threads, welds, etc. because they are not as versatile and efficient (e.g., welded, flanged, threaded, etc.) as metal pipe elements (e.g., steel, aluminum and alloys, titanium and alloys, etc.) due to their inherent disadvantages (e.g., low shear strength, low modulus of elasticity, fiber brittleness, etc.). Chinese patent document CN 103115200B discloses a double-layer concrete conveying pipe of an outer layer of fiber reinforced composite material and an inner layer of steel, the conveying pipe mainly comprises a main pipe, a flange and a fiber composite material layer, wherein the flange comprises a connecting pipe of a saw-tooth part and an end flange, the flange and the main pipe form a welding assembly through spot welding, and the fiber composite material layer is connected into a whole through a saw-tooth part of fiber wound on the connecting pipe. The joint can bear larger axial tension load theoretically, but in practice, the operation of winding fiber is inconvenient, and the joint is easy to fall off, especially when the flange needs to bear bending and twisting loads simultaneously.
Disclosure of Invention
The invention aims to solve the technical problems of overcoming the defects of the prior art and providing the fiber reinforced composite material and the metal composite tube 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 fiber reinforced composite and metal composite pipe, includes the metal lining pipe, the metal lining pipe both ends are equipped with metal joint, and the metal lining pipe periphery is equipped with fiber reinforced composite pipe, be equipped with the conical surface on the metal joint, and follow the tip of metal lining pipe is to the central direction, the conical surface with the distance of metal lining pipe axle center increases gradually, set firmly at least one round fixed pin on the conical surface, the quantity of fixed pin is a plurality of and evenly arranges in the same round, fiber reinforced composite pipe tip winding in the fixed pin, the fixed pin periphery is equipped with and is used for compressing tightly the outer protective sheath of fiber reinforced composite pipe. Wherein, the outer protective sleeve preferably adopts two semicircular sub-sleeves and is connected into a whole through a fastener.
As a further improvement of the above technical scheme: the number of fiber layers of the fiber reinforced composite material pipe is N 1, the number of turns of the fixing pin is N 2, then N 2≤N1 is less than or equal to 2, two adjacent turns of the fixing pin are staggered, the staggering angle and the fiber winding angle are different by less than or equal to +/-10 degrees, the included angle between the conical surface and the axis of the metal lining pipe is beta 1, and then beta 1 is less than or equal to 2 degrees and less than or equal to 30 degrees. The number of turns of the fixing pins is related to the number of fiber layers, so that the number of the fixing pins is increased, the stress is shared, the number of turns of the fixing pins is increased, the fixing pins are staggered for a certain angle, and the capability of transmitting torque and resisting buckling deformation is improved; the number of the fixing pins in each circle is determined according to the single-layer wire distribution density and the angle, and the number of the fixing pins is preferably 6-45; the specific included angle beta 1 between the conical surface and the axis of the metal lining tube is favorable for transmitting torque and axial pulling force, and the more preferable value is 2-8 degrees.
As a further improvement of the above technical scheme: the conical surface is provided with a blind hole, the fixing pin is arranged in the blind hole and is in interference fit with the blind hole, wherein the blind hole can be processed in a numerical control drilling mode by adopting a standard cutter, the fixing pin can be a commercially available standard part and can be arranged in the blind hole in a cold-mounting or mechanical press-mounting mode, and the metal joint is simple in structure, easy to process and low in manufacturing cost; or the fixing pin can be directly welded on the conical surface, so that the fixing pin and the metal joint can be fixedly connected.
As a further improvement of the above technical scheme: the fiber of each layer of the fiber reinforced composite material pipe is alternately distributed according to +45 DEG-60 DEG, 90 DEG, -45 DEG-60 DEG and 90 DEG along the axial direction of the metal lining pipe, or alternately distributed according to-45 DEG-60 DEG, 90 DEG, -45 DEG-60 DEG and 90 DEG along the axial direction of the metal lining pipe, wherein the sum of the thicknesses of fiber layers of the fiber reinforced composite material pipe of +45 DEG-60 DEG and-45 DEG-60 DEG is t 45 (total layer number x single layer thickness), and the sum of the thicknesses of fiber layers of the fiber reinforced composite material pipe of the fiber reinforced composite material is t 90 (total layer number x single layer thickness), and then t 45/t90 is more than or equal to 1.5 and less than or equal to 2.0. The radial load on the pipe wall according to the internal pressure pipe is about 2 times the axial load. In the limit reinforced composite material, the wire distribution direction has an important influence on the tensile stress, the tensile strength of the 0-degree wire distribution with the tensile stress direction is ten times or even tens times of the tensile strength of the 90-degree wire distribution, and the tensile stress in two directions is almost equal when the wire distribution is 45-degree, but the stress concentration problem is caused by the 0-degree wire distribution and the 90-degree wire distribution. Based on the above, for the pressure-bearing pipeline, the reasonable wire distribution direction should adopt the alternating wire distribution of approximately 90 degrees and approximately 45 degrees with the axial direction of the pipe body, so that the radial stretching of the pipe body is optimally realized to be twice as high as the axial stretching strength, and the thickness of the fiber reinforced composite material pipe is optimized.
As a further improvement of the above technical scheme: the metal lining pipe comprises a main pipe, a wear-resistant pipe and two wear-resistant sleeves, the wear-resistant performance of the wear-resistant pipe and the wear-resistant sleeves is superior to that of the main pipe, the outlet end of the wear-resistant pipe and the inlet end of the main pipe are sleeved in a conical manner, 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 sleeves is sleeved on the peripheries of the wear-resistant pipes and the wear-resistant sleeves at the inlet ends of the wear-resistant pipes, the other wear-resistant sleeve is sleeved on the peripheries of the wear-resistant sleeves at the outlet ends of the main pipe and the main pipe, and the metal joints and the main pipe are in interference fit or strong adhesion. The greatest demand for lightweight wear resistant piping is for overhead working machines, such as pump trucks. The pipeline inlet section is more severely worn within a range of 200mm and has shorter service life under the influence of the erosive wear of the flowing concrete, so that the service life of the whole pipeline can be prolonged by locally using more wear-resistant materials, and the cost performance is improved. For example, the super wear-resistant pipe adopts die steel or martensitic stainless steel such as Cr12, cr12MoV, cr5Mo,4Cr13 or 9Cr18, the main pipe adopts bearing steel such as GCr15, and the wear-resistant sleeve adopts high-chromium cast iron, hard alloy and the like which are more wear-resistant than the main pipe; the metal joint can be provided with a connecting flange as an interface with other pipelines, and the interface meets A, B, C type flange in 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 scheme: the total length of the wear-resistant pipe and the wear-resistant sleeve at the inlet end is L 1, the length of the wear-resistant pipe and the main pipe extending into the corresponding metal joint is L 2, and the sleeve length of the conical sleeve is L 3, so that L 1≤200mm、3mm≤L2≤60mm、3mm≤L3 is more than or equal to 60mm and less than or equal to 15mm. Further preferably, the value is 10 mm.ltoreq.L 2≤30mm、5mm≤L3.ltoreq.8 mm.
As a further improvement of the above technical scheme: the metal lining pipe comprises a main pipe and two wear-resistant sleeves, the two wear-resistant sleeves are respectively in butt joint with two ends of the main pipe, a thickening pipe is sleeved on the periphery of an inlet end of the main pipe, one metal joint is sleeved on the periphery of the thickening pipe and the corresponding wear-resistant sleeve, the other metal joint is sleeved on the periphery of the main pipe and the corresponding wear-resistant sleeve, and interference fit or gluing is adopted between the metal joint and the thickening pipe and between the metal joint and the main pipe; or the thickened pipes are sleeved outside Zhou Jun of the inlet end and the outlet end of the main pipe, the metal joints are sleeved on the peripheries of the thickened pipes and the corresponding wear-resistant sleeves, and interference fit or gluing is adopted between the metal joints and the thickened pipes. The greatest demand for lightweight wear resistant piping is for overhead working machines, such as pump trucks. The pipeline inlet section is more severely worn within a range of 200mm and has shorter service life under the influence of the erosive wear of the flowing concrete, so that the service life of the whole pipeline can be prolonged by adopting local thickening, the cost performance is improved, for example, the two ends are thickened or only the inlet end is thickened, and the thickened pipeline can be sleeved into the peripheries of the main pipeline and the wear-resistant sleeve through interference fit by cold fitting.
As a further improvement of the above technical scheme: the metal joint is sleeved on the periphery of the metal lining pipe, and the two ends of the metal joint are sealed with the metal lining pipe through sealing weld joints; or the metal joint is in butt joint with the metal lining tube through a penetration welding line. The design principle of the corrosion-resistant pipeline is basically the same as that of the wear-resistant pipeline, only the materials of the metal lining pipeline and the connection structure of the metal joint are different, 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 building construction machinery and equipment concrete conveying pipe type and size; or the metal lining tube and the metal joint are subjected to butt fusion welding, and the metal joint can also adopt the connecting mode. If the conveying medium is only corrosive, the metal joint of the metal lining pipeline 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 abrasion medium, the martensitic stainless steel and other abrasion-resistant and corrosion-resistant metal materials can be adopted. The fiber reinforced composite material and the corrosion-resistant metal material composite pipe are adopted, so that the manufacturing cost of the pipeline can be greatly reduced, and the small-caliber pipeline is connected by adopting a B-type flange, so that the field installation is convenient; the large-caliber pipeline adopts C-shaped flange connection, so that the construction cost is greatly reduced and the work efficiency is improved compared with on-site welding.
As a further improvement of the above technical scheme: the fiber reinforced composite material and metal composite pipe further comprises a pipe fitting fixing assembly, wherein the pipe fitting fixing assembly comprises a U-shaped bolt and a rubber buffer pad, a groove is formed in the rubber buffer pad, and the U-shaped bolt is clamped in the groove. For wear resistant pipes, improving 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 pump truck conveying pipe increases the wall thickness of the pipeline, if the inner diameter is reduced, the flow rate is increased and the pressure is increased; and when the outer diameter is increased, the work efficiency of concrete pumping is not affected. The U-shaped fixing piece of the prior patent and practical application products has relatively fixed inner diameter, and is assembled with the conveying pipe with a gap of 1-2mm, but forced assembly is more frequently caused by machining errors and the like. According to the invention, the inner diameter of the whole pipe fitting fixing assembly is adjusted by utilizing the thickness change of the rubber buffer pad of the U-shaped bolt, so that flexible adaptation to the increase of the outer diameter of the conveying pipe is realized, and the manufacturing difficulty and cost of the pipe fitting fixing assembly are reduced. As a preferable technical scheme: the outer diameter of the concrete conveying pipe is changed from 133mm every 2-4mm, the size of the U-shaped bolt is kept unchanged, matching is achieved through thickness change of the rubber buffer pad, for example, a model is determined every 1.5mm, and fiber reinforced rubber is adopted as the material.
Compared with the prior art, the invention has the advantages that: the invention discloses a fiber reinforced composite material and a metal composite pipe, wherein a conical surface is arranged on a metal joint, the distance between the conical surface and the axis of the metal lining pipe is gradually increased along the direction of the end part of the metal lining pipe towards the center, at least one circle of fixing pins are arranged on the conical surface, the number of the fixing pins in the same circle is a plurality of the same circle and the fixing pins are uniformly arranged along the circumferential direction, fiber wires are wound on the fixing pins, the fiber reinforced composite material pipe is tightly pressed and tightly attached to the metal joint by utilizing an outer protective sleeve, the structure is easy to process and manufacture, the connection strength of the fiber reinforced composite material pipe and the metal joint is ensured, the tensile stress and the torsional stress of the fiber reinforced composite material pipe are firstly transferred to the fixing pins, and the fixing pins are transferred to the metal joint; or a plurality of rings of bosses are arranged on the metal joint at intervals, a plurality of rings of convex parts are arranged on the fiber reinforced composite material pipe at intervals, the bosses are matched with the convex parts in a concave-convex way, the outer protective sleeve is utilized to tightly press the fiber reinforced composite material pipe 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; the outer protective sleeve can effectively prevent the fiber reinforced composite material pipe and the metal joint from falling off, and the fixing pin can also prevent the fragile fiber yarn from being damaged to cause fracture, so that the safety and the reliability of the composite material pipe are improved.
The utility model provides a fibre reinforced composite and metal composite pipe, includes the metal lining pipe, the metal lining pipe both ends are equipped with metal joint, and the metal lining pipe periphery is equipped with the fibre reinforced composite pipe in, the interval is provided with the multiturn 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 multiturn bellying on the fibre reinforced composite pipe, multiturn bellying and the unsmooth cooperation of multiturn boss, 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 diagram of a first embodiment of a fiber reinforced composite and metal composite tube according to the present invention.
Fig. 2 is a schematic structural view of a first embodiment of a metal fitting according to the present invention.
Fig. 3 is a schematic structural view of a second embodiment of a metal fitting according to the present invention.
Fig. 4 is A-A view of fig. 3.
Figure 5 is a schematic view of the structure of the outer protective sheath in the present invention.
Fig. 6 is a schematic structural view of a first embodiment of the present invention for use as a wear resistant pipe.
Fig. 7 is a schematic view of the construction of a second embodiment of the invention for use as a wear resistant pipe.
Fig. 8 is a schematic structural view of a third embodiment of the present invention for use as a wear resistant pipe.
Fig. 9 is a schematic structural view of a first embodiment of the present invention for use as a corrosion resistant pipe.
Fig. 10 is a schematic structural view of a second embodiment of the present invention for use as a corrosion resistant pipe.
Fig. 11 is a schematic structural view of a pipe fixing assembly according to the present invention.
Fig. 12 is a B-B view of fig. 11.
Fig. 13 is a schematic diagram showing the structure of a fiber reinforced composite material and metal composite pipe according to a second embodiment of the present invention.
The reference numerals in the drawings 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. conical surface; 22. a fixing pin; 23. a boss; 3. a fiber reinforced composite tube; 31. a boss; 4. an outer protective sleeve; 5. a tube fixing assembly; 51. u-shaped bolts; 52. a rubber cushion pad; 53. a groove.
Detailed Description
The invention is described in further detail below with reference to the drawings and specific examples of the specification.
Fig. 1 to 12 show a first embodiment of the fiber reinforced composite and metal composite tube of the present invention, wherein:
Metal joint 2
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 beta 1 with the axis, a1 is more than or equal to 2 degrees and less than or equal to 30 degrees, and a1 is more than or equal to 2 degrees and less than or equal to 8 degrees; the conical surface 21 is provided with blind holes with the number of N2 weeks (or turns) perpendicular to the axis, each blind hole is provided with a fixed pin 22 in an interference fit manner, N2 is more than or equal to 1 and less than or equal to N1 (N1 is the number of fiber winding layers), and N2 is more than or equal to 2 and less than or equal to N1 is preferable; the number of blind holes is preferably 6-45 (including the end value); the angle of blind hole staggering from circumference to circumference differs from the fiber winding angle by not more than + -10 deg.. Of course, in other embodiments, the fixing pin 22 may be directly welded to the conical surface 21; the fixing pin 22 is preferably a cylindrical pin, although in other embodiments, a cylindrical pin may be used to perform the function.
The outer periphery that fiber reinforced composite material pipe 3 and metal joint 2 combined adopts two semicircular outer protective sheath 4 to fasten through 6 lock nut spare, further prevents that fiber reinforced composite material pipe 3 and metal joint 2 from droing. The metal lining tube 1 is made of wear-resistant materials (bearing steel, tool steel, high-carbon steel, die steel, medium-high chromium cast iron and the like, and the low-temperature tempering hardness can reach HRC 58-67 steel or cast iron) or corrosion-resistant materials (corrosion-resistant steel iron or nonferrous metals such as stainless steel, nickel-based alloy, copper alloy, aluminum alloy and the like) or wear-resistant and corrosion-resistant surface treatment.
As wear-resistant pipe
The greatest demand for lightweight wear resistant piping is for overhead working machines, such as pump trucks. The pipeline inlet section is more severely worn within 200mm and has shorter service life due to the influence of the erosive wear of the flowing concrete, so that the service life of the whole pipeline is prolonged by locally thickening or adopting more wear-resistant materials, the cost performance is improved, and the specific view is shown in figures 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 GCr15. The main pipe 11 and the wear-resistant pipe 12 are connected in a taper sleeve fit manner, and the length of the taper surface is 3mm or more and L3 or less and 15mm or less, preferably 5mm or less and L3 or less and 8mm or less. The total length of the wear-resistant pipe 12 and the wear-resistant sleeve 13 is 60mm or more and L1 or less than or equal to 200mm or less (applicable to all wear-resistant pipes of the invention); the length of the main pipe 11 and the wear-resistant pipe 12 inserted into the corresponding metal joint 2 is 3mm less than or equal to L2 and less than or equal to 60mm, preferably 10mm less than or equal to L2 and less than or equal to 30mm, and interference fit or strong adhesion or both interference fit and strong adhesion are adopted (applicable to all wear-resistant pipes of the invention); the wear-resistant sleeve 13 adopts high-chromium cast iron and hard alloy which are more wear-resistant relative to the main pipe 11; the flange can be arranged on the metal joint 2 and used as an interface with other pipelines, and the interface accords with a A, B, C type flange (applicable to all wear-resistant pipelines of the invention) in building industry standards of JB/T11187 building construction machinery and equipment concrete conveying pipe type and size in the field of concrete conveying pipes.
In the second embodiment, the design principle of local thickening is adopted in the L1 section and the outlet section of the main pipe 11, and the difference of the first embodiment is that the thickened pipe 14 is sleeved in the outer wall of the main pipe 11 directly through interference fit by cold fitting; in the third embodiment, only the L1 section of the main pipe 11 is designed with local thickening, the cost of the technical solution of the second embodiment is lower than that of the first embodiment, the cost of the third embodiment is lower than that of the first embodiment, the structure of the wear-resistant sleeve 13 can be further simplified to reduce the cost, and in order to adapt to the change of the wear-resistant sleeve 13, the shape and the size of the connecting flange on the metal joint 2 are correspondingly changed.
As corrosion resistant tubing
The corrosion resistant pipe design is basically the same as the wear resistant pipe design, with only a slight difference between the metal lining pipe 1 and the metal fitting 2, see in particular fig. 7 to 8.
In the first embodiment of the corrosion-resistant pipe, the main pipe 11 (i.e. the metal lining pipe 1 at this time) is inserted into the metal joint 2 and sealed by adopting two sealing welds, and the connection mode of the flange arranged on the metal joint 2 can also adopt a A, B, C type flange in the building industry standard of JB/T11187 building construction machinery and equipment concrete conveying pipe type and size.
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 in 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 abrasion medium, the martensitic stainless steel and other abrasion-resistant and corrosion-resistant metal materials can be adopted.
The fiber reinforced composite material and the corrosion-resistant metal material composite pipe are adopted, so that the manufacturing cost of the pipeline can be greatly reduced, and the small-caliber pipeline is connected by adopting a B-type flange, so that the field installation is convenient; the large-caliber pipeline adopts C-shaped flange connection, so that the construction cost is greatly reduced and the work efficiency is improved compared with on-site welding.
Pipe fixing assembly 5
For wear resistant pipes, improving 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 pump truck conveying pipe increases the wall thickness of the pipeline, if the inner diameter is reduced, the flow rate is increased and the pressure is increased; and when the outer diameter is increased, the work efficiency of concrete pumping is not affected. In the prior art, the inner diameter of the U-shaped fixing piece is relatively fixed, a gap of 1-2mm is reserved between the U-shaped fixing piece and the conveying pipe, but forced assembly exists in many cases in practical application due to machining errors and the like.
The invention adjusts the inner diameter of the whole pipeline fixing assembly 5 by utilizing the thickness change of the rubber buffer pad 52 of the U-shaped bolt 51, thereby flexibly realizing the adaptation to the increase of the outer diameter of the conveying pipe and reducing the manufacturing difficulty and cost of the pipeline fixing assembly 5. The specific scheme is as follows: the pipe fixing assembly 5 comprises a U-shaped bolt 51 and a rubber buffer pad 52, a groove 53 is formed in the rubber buffer pad 52, the U-shaped bolt 51 is clamped in the groove 53, the U-shaped bolt 51 is unchanged, and the thickness of the rubber buffer pad 52 is changed. The outer diameter of the concrete pipe is changed from 133mm to 2-4mm at intervals, and the thickness of the rubber cushion pad 52 is preferably set to 1.5mm at intervals, and is made of fiber reinforced rubber.
Method for manufacturing metal joint 2
The manufacturing method of the metal joint 2 comprises the following steps: sawing steel pipes, turning flat two end surfaces, turning interface ends, turning back conical surfaces (namely the conical surface 21), and forward conical surfaces (using the forward conical surfaces to enable the surface of the metal joint 2to be transited to the surface of the metal lining pipe 1), and carrying out inner diameter-numerical control drilling to install blind holes of the fixed pins 22, and assembling round pins 22 in an interference fit manner (cold mounting or mechanical press mounting can be adopted); or sawing and blanking the steel tube, turning the flat two end surfaces, turning the joint end, turning the inverted conical surface (namely the conical surface 21), and using the inverted conical surface to enable the surface of the metal joint 2to be transited to the surface of the metal lining tube 1), and inner diameter, and welding the fixing pin 22 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 purchases the standard.
The manufacturing method has the advantages that: a) Standard cutter processing can be adopted, numerical control drilling is realized, the efficiency is high, and the cost is low; b) The fixing pin 22 is standardized to be manufactured and purchased, so that the cost is low, and the fiber is not easy to damage; c) The interference fit cold fitting has high efficiency and reliable structure.
Method for manufacturing wear-resistant pipeline
The metal joint 2 is manufactured as described above, and the other steps are as follows:
a. the main pipe 11 adopts a seamless pipe or welded pipe for sawing and blanking, the conical surface is matched with the main pipe to be machined,
B. heat treatment, quenching and tempering, and the heat treatment ensures that the pipe body has high hardness and certain toughness and fatigue life,
C. The main pipe body is assembled, the conical surface is matched, or a wear-resistant sleeve is additionally arranged,
D. Heat treatment after casting and molding the high-chromium cast iron type wear-resistant sleeve, heat treatment after machining the die steel and the bearing steel type, sintering and molding the hard alloy type wear-resistant sleeve,
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 +/-1 mm,
F. Fiber braiding, wherein the first layer is used for distributing wires according to the axial direction of the main pipe 11 by 45 degrees, the second layer is used for distributing wires according to the axial direction of 90 degrees, the third layer is used for distributing wires according to the axial direction of-45 degrees, the fourth layer is used for distributing wires according to the axial direction of 90 degrees, the fifth layer is used for distributing wires according to the axial direction of-45 degrees, and if the layer number is further increased, fiber winding is ensured to be tightly fastened on the round pin column 22 at the position of the head and tail metal joint 2 according to the circulation, and the fiber winding is tightly matched with the conical surface 21; the number of layers of the cloth wires is related to the size of the wire bundles, can be increased or reduced, but needs to satisfy that t 45/t90 is less than or equal to 1.5 and less than or equal to 2.0,
G. the fiber cloth is wrapped, a layer of fiber cloth can be wrapped around the fiber reinforced composite material pipe 3 in order to ensure the appearance of the pipe fitting,
H. Solidifying the resin, heating the pipe fitting in a curing barn at 130-160 ℃ for 30-60 minutes,
I. Appearance treatment, namely polishing and then spraying paint on a pipe fitting needing paint, polishing and finishing the pipe fitting needing no paint, and mounting the outer protective sleeve 4 and then warehousing.
Method for manufacturing corrosion-resistant and wear-resistant pipeline
The metal joint 2 is manufactured as described above, and other steps are as follows:
a. The main pipe 11 is sawn and cut, the pipe body which needs wear resistance and corrosion resistance needs heat treatment,
B. The main pipe 11 is welded into a whole after being riveted with the metal joint 2,
C. Filament winding braiding (supra);
d. wrapping fiber cloth (same as above);
e. Curing the resin (as above);
f. Appearance treatment (same as above)
Method for manufacturing a pipe fixing assembly 5
The manufacturing method of the U-shaped bolt 51 comprises the following steps:
a. Round steel saw blanking
B. The two ends of the thread are machined,
C. Hot-roll (or cold-roll) forming, and simultaneously realizing bending forming,
D. The surface treatment of the zinc plating is carried out,
Method for manufacturing rubber cushion 52:
the fiber reinforced rubber is adopted, after rubber mixing, the rubber is molded and vulcanized by a mold, the thickness t of the bottom of the rubber is manufactured at intervals of 1.5mm, and the lengths are the same.
The fiber reinforced composite material is greatly influenced by fiber arrangement, and has high tensile strength along the length direction of the fiber, which is ten times or even more than several tens of times of the vertical direction; the fibers are connected through resin or other high polymer materials, so that the shear modulus is low; therefore, according to the stress characteristics, fibers are reasonably arranged, and the method 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 as high as 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 yarn is directly wound on the metal joint 2, the stretching stress of the monofilament is transmitted to the round pin column 22, the round pin column 22 is transmitted to the metal joint 2, the axial tensile stress bearing capacity of the fiber-reinforced composite material tube is basically consistent with that of the tube body, and an outer metal protective sleeve is added, so that the fiber-reinforced composite material tube 3 and the metal joint 2 are effectively prevented from falling off; the round pins 22 are arranged in an array, so that the twisting stress brought by the fiber reinforced composite material pipe 3 can be effectively transferred, the connection strength of 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 aspect of wear resistance, a double-layer concrete conveying pipe made of 2.5mm thick GCr15 bearing steel and 2mm thick Q345 steel is adopted, C30 concrete can be conveyed to be more than 5 m/m, the selling price is 250 m/m, and the cost performance is about 150 m/m. In the embodiment of the invention, GCr15 after 4mm is adopted as an inner pipe, the converted C30 concrete delivery capacity can be more than 8 square meters, the selling price is 333 yuan per meter, and the cost performance is about 125 yuan per square meter; if a 2.5mM Cr15 bearing steel+2.5mm composite material pipe is adopted, the weight of the 3m pipe can be reduced from about 44Kg to 33Kg by about 11Kg under the same service life, the weight of the 60m long pump truck arm support pipe can be reduced by about 220Kg, the contribution to the tipping moment can be up to about 6 tons per meter, and the light weight advantage is not achieved by the all-steel conveying pipe.
In the corrosion-resistant function, for example, in the oil and gas conveying field, a 304 stainless steel inner pipe with the thickness of 3-5mm and a stainless steel joint are adopted, a 15mm composite material is externally wound, the tensile strength is about 600MPa, the tensile strength is equivalent to that of X70 pipeline steel, the weight per meter is reduced by 50%, maintenance-free can be realized, and no other additional current is needed, and the anode is sacrificed to protect the cathode zinc-aluminum alloy block and the like from corrosion protection.
Therefore, the fiber reinforced composite material and metal material composite pipe has the advantages of high cost performance, light weight, simple maintenance and installation and the like in the gas-liquid-solid single-phase or multi-phase material conveying fields such as wear-resistant materials, oil 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 tube according to the present invention, which is substantially the same as the first embodiment, except that the metal joint 2 is provided with a plurality of bosses 23 for connecting and fixing the fiber reinforced composite material tube 3, the fiber reinforced composite material tube 3 is provided with a plurality of bosses 31, and the fiber reinforced composite material tube 3 and the metal joint 2 are in concave-convex fit, so that the fiber winding is more convenient than in the prior art, and the fiber is more advantageous for avoiding falling off, and the fiber reinforced composite material tube is mainly suitable for non-severe working conditions than in the first embodiment.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art, or equivalent embodiments with equivalent variations can be made, without departing from the scope of the invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall fall within the scope of the technical solution of the present invention.
Claims (4)
1. The utility model provides a fibre reinforced composite and metal composite pipe, includes bushing pipe (1) in the metal, bushing pipe (1) both ends are equipped with metal joint (2), and bushing pipe (1) periphery is equipped with fibre reinforced composite pipe (3), its characterized in that in the metal: the metal joint (2) is provided with a conical surface (21), the distance between the conical surface (21) and the axis of the metal lining tube (1) is gradually increased along the central direction of the end part of the metal lining tube (1), at least one circle of fixing pins (22) are fixedly arranged on the conical surface (21), the fixing pins (22) are cylindrical pins, the number of the fixing pins (22) in the same circle is multiple and uniformly distributed, the end part of the fiber reinforced composite material tube (3) is wound on the fixing pins (22), and an outer protective sleeve (4) for pressing the fiber reinforced composite material tube (3) is arranged on the periphery of the fixing pins (22);
The metal lining pipe (1) comprises a main pipe (11), a wear-resistant pipe (12) and two wear-resistant sleeves (13), wherein the wear-resistant performance of the wear-resistant pipe (12) and the wear-resistant sleeves (13) is superior to that of the main pipe (11), the outlet end of the wear-resistant pipe (12) and the inlet end of the main pipe (11) are sleeved in a conical manner, the two wear-resistant sleeves (13) are respectively butted 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 sleeves (13) at the inlet ends of the wear-resistant pipe (12) and the wear-resistant pipe (12), the other metal joint (2) is sleeved on the peripheries of the wear-resistant sleeves (13) at the outlet ends of the main pipe (11) and the main pipe (11), the metal joint (2) and the wear-resistant pipe (12) are matched or glued, the total length of the wear-resistant joint (12) and the wear-resistant sleeve (12) at the inlet end of the wear-resistant pipe (12) is 35 mm or less than or equal to 35 mm, and the total length of the wear-resistant joint (35L and 35 is equal to or less than or equal to 35 mm;
Or the metal lining pipe (1) comprises a main pipe (11) and two wear-resistant sleeves (13), the two wear-resistant sleeves (13) are respectively in butt joint 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 periphery 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 other wear-resistant sleeve (13), and interference fit or gluing is adopted between the metal joint (2) and the thickening pipe (14) and between the metal joint (2) and the main pipe (11); or a thickening pipe (14) is sleeved outside Zhou Jun of the inlet end and the outlet end of the main pipe (11), the metal joint (2) is sleeved on the peripheries of the thickening pipe (14) and the corresponding wear-resistant sleeve (13), and interference fit or gluing is adopted between the metal joint (2) and the thickening pipe (14);
The fiber reinforced composite material and metal composite pipe further comprises a pipe fitting fixing assembly (5), the pipe fitting fixing assembly (5) comprises a U-shaped bolt (51) and a rubber buffer pad (52), a groove (53) is formed in the rubber buffer pad (52), and the U-shaped bolt (51) is clamped in the groove (53).
2. The fiber reinforced composite and metal composite tube of claim 1, wherein: the number of fiber layers of the fiber reinforced composite material pipe (3) is N 1, the number of turns of the fixing pin (22) is N 2, then 2 is less than or equal to N 2≤N1, two adjacent turns of the fixing pin (22) are staggered, the staggering angle is not more than +/-10 degrees with the fiber winding angle, the included angle between the conical surface (21) and the axis of the metal lining pipe (1) is beta 1, and then 2 degrees is less than or equal to beta 1 is less than or equal to 30 degrees.
3. The fiber reinforced composite and metal composite tube 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 on the conical surface (21).
4. The fiber reinforced composite and metal composite tube of claim 1, wherein: the fiber of each layer of the fiber reinforced composite material pipe (3) is alternately distributed according to +45 DEG-60 DEG, 90 DEG, -45 DEG-60 DEG and 90 DEG along the axial direction of the metal lining pipe (1), or alternately distributed according to-45 DEG-60 DEG, 90 DEG, +45 DEG-60 DEG and 90 DEG along the axial direction of the metal lining pipe (1), the sum of the thicknesses of the fiber layers of the +45 DEG-60 DEG and-45 DEG-60 DEG is t 45, and the sum of the thicknesses of the fiber layers of the 90 DEG is t 90, and then t 45/ t90 is more than or equal to 1.5 and less than or equal to 2.0.
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| CN113007461B (en) * | 2021-03-10 | 2023-03-31 | 北京玻钢院复合材料有限公司 | High-sealing composite material high-pressure pipeline and processing method thereof |
| CN113790029A (en) * | 2021-08-27 | 2021-12-14 | 南充西南石油大学设计研究院有限责任公司 | Fiber metal composite drill rod |
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| CN209084195U (en) * | 2018-11-16 | 2019-07-09 | 荣冉升 | A kind of fibre reinforced composites and metal composite pipe |
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| FR2879715B1 (en) * | 2004-12-17 | 2007-04-06 | Saipem S A Sa | SUB-MARINE COAXIAL CONDUIT ELEMENT ALLEGE AND REINFORCED |
| CN103486387A (en) * | 2012-06-11 | 2014-01-01 | 泰州申视塑料有限公司 | Steel framework enhancement composite pipe material bearing inserting and welding method |
| CN203395412U (en) * | 2013-08-02 | 2014-01-15 | 伦慧东 | Underground coal mine used steel lining steel wire fiber-reinforced inorganic gel composite tube |
| CN104033669B (en) * | 2014-06-23 | 2017-01-25 | 山东冠通蓝海石油管材有限公司 | Continuous fiber reinforced non-adhesive compound flexible pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105626979A (en) * | 2016-02-05 | 2016-06-01 | 中联重科股份有限公司 | Delivery system, delivery pipe and method of manufacturing the same |
| CN209084195U (en) * | 2018-11-16 | 2019-07-09 | 荣冉升 | A kind of fibre reinforced composites and metal composite pipe |
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