CN112780868B - Connection method of nonmetallic connection joint for composite pipe - Google Patents
Connection method of nonmetallic connection joint for composite pipe Download PDFInfo
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- CN112780868B CN112780868B CN202011624668.5A CN202011624668A CN112780868B CN 112780868 B CN112780868 B CN 112780868B CN 202011624668 A CN202011624668 A CN 202011624668A CN 112780868 B CN112780868 B CN 112780868B
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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
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/02—Welded joints; Adhesive joints
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Abstract
The application discloses a connecting method of a nonmetallic connecting joint for a composite pipe, wherein the joint is provided with a hot-melting sleeve which is sleeved at the pipe ends of the composite pipes at two sides in butt joint and has a certain width range, and the hot-melting sleeve is coated with a reinforcing coating layer which is tightly connected with the pipe ends of the composite pipes at two sides in a hot-melting inward shrinking state by the same hot-melting sleeve. The inner wall of the hot melting sleeve is designed into a conical structure which is used for locking the two side composite pipes in opposite directions and is provided with reverse butt joint, the conical structure of the reverse butt joint is composed of a first inclined plane and a second inclined plane which are symmetrically connected with each other, and the first inclined plane and the second inclined plane are gradually inclined from the joint of the two inclined planes towards the port and the axis direction of the hot melting sleeve. The joint and the connecting method realize the tight connection of the composite pipe, can effectively overcome the circumferential torsion external force and the axial reverse tension force at the joint of the composite pipe after the connection, and improve the reliability of the connection. And the joint and the composite pipe adopt a hot melting butt joint mode, so that the sealing performance of the joint of the composite pipe is higher.
Description
Technical Field
The application relates to the technical field of composite pipe connection, in particular to a connection method of a nonmetallic connection joint for a composite pipe.
Background
The composite pipe is a petroleum and natural gas industrial pipe piece which is made of polymer composite material and has certain high strength, high pressure, corrosion resistance, scaling resistance, small friction coefficient, good heat preservation, good flexibility and long service life. In the actual use process, because the transportation line has the characteristics of longer distance, a plurality of composite pipes are generally connected in a butt joint mode through the metal connector so as to realize the longer transportation line. When fluid or gas is conveyed, the metal joint is generally mechanically connected with the pipe ends at two sides, and meanwhile, the pipe ends of the composite pipes at two sides cannot reach the theoretical surface smoothness, so that the metal joint cannot be tightly attached to the surfaces of the pipe ends in a common mechanical fastening connection mode, the metal joint has a poor attaching sealing effect with the composite pipes, and the pipe body is internally provided with higher conveying pressure, so that the fluid or gas is easily leaked from the connecting parts in the conveying process, and potential safety hazards and environmental pollution are caused. On the other hand, because the adjacent pipelines are connected through the metal joints, the radial external force effect of the axial external force is applied to the connecting part of the composite pipe, and then the tightness of the connection of the composite pipe is reduced, and the leakage problem is also caused. Moreover, the corrosion resistance of the metal joint is poor, the cost is high, the whole corrosiveness of the pipeline is asynchronous, the corrosion resistance of the metal joint is weakened in advance compared with that of the composite pipe under the normal conveying condition of the pipeline, and the replacement difficulty of the metal joint is further caused.
Disclosure of Invention
Aiming at the problems, the application aims to provide a connecting method of a nonmetallic connecting joint for a composite pipe, which realizes the tight connection of the composite pipe, can effectively overcome the circumferential torsion external force and the axial reverse tension force at the connecting part of the composite pipe after the connection of the composite pipe, and improves the reliability of the connection.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows: the joint is provided with a hot-melting sleeve which is sleeved on the pipe ends of the composite pipes at two sides in butt joint at a certain width range, and the hot-melting sleeve is coated with a reinforcing coating layer which is tightly connected with the pipe ends of the composite pipes at two sides in a hot-melting inward shrinking state.
Preferably, the inner wall of the hot melting sleeve is a cone structure for locking the two sides of the composite pipe in opposite directions and having opposite butt joint, the opposite butt joint cone structure is composed of a first inclined plane and a second inclined plane which are symmetrically connected with each other, and the first inclined plane and the second inclined plane are gradually inclined from the joint of the two inclined planes towards the port of the hot melting sleeve and the axial direction.
Preferably, the reinforcing coating layer has a width in the axial direction of the joint greater than the width of the hot-melt sheath.
Preferably, the inner wall of the hot melt jacket is closer to the axis of the joint than the inner wall of the reinforcing cladding.
Preferably, an electric heating wire is arranged in the hot melting sleeve, and a conductive hole for conducting the electric heating wire is formed in a penetrating manner at a position corresponding to the hot melting sleeve and the reinforced coating layer.
Preferably, the hot melting sleeve is a PE material layer, and the reinforced coating layer is a glass fiber and epoxy resin mixed material layer.
The connecting method of the nonmetallic connecting joint for the composite pipe is characterized by comprising the following steps of:
s1, sequentially arranging an inner liner layer, a reinforcing layer and an outer coating layer on the composite pipe which is butted by the joints, firstly sleeving the joints on a pipe body of the composite pipe on one side, and then cutting the reinforcing layer and the outer coating layer at the pipe orifice of the butted composite pipe on each side and leaking the inner liner layer with a certain butted width;
s2, hot-melting and butt-jointing the inner liners leaked from the butted composite pipes through a first hot-melting tool, and polishing the joint of the inner liners subjected to hot-melting and butt-joint cooling to enable the surfaces of the inner liners integrally connected in a butt-joint mode to be smooth;
s3, grinding a third inclined plane and a fourth inclined plane which are symmetrical and are in butt joint from the center of the outer surface to the directions of the composite pipes on the two sides in sequence based on the integral lining layer after hot melting butt joint, wherein the third inclined plane and the fourth inclined plane are gradually inclined towards the axial directions of the composite pipes and the pipe body;
s4, hot-melting the integrated lining layer after hot-melting and butt-jointing by a second hot-melting tool, and simultaneously hot-melting a sealing layer on the outer wall surface of the integrated lining layer with a third inclined surface and a fourth inclined surface, so that the sealing layer is flush with the outer wall of the outer cladding layer;
s5, grinding a fifth inclined plane and a sixth inclined plane which are sequentially matched with the first inclined plane and the second inclined plane of the hot melting sleeve on the outer surface of the sealing joint layer;
s6, moving the joint to the first inclined plane and the second inclined plane which correspond to the fifth inclined plane and the sixth inclined plane in sequence, then heating the hot melting sleeve through the conductive holes to enable the hot melting sleeve to be hot melted and tightly connected to the sealing layer in a tightening mode, enabling the reinforcing coating layer to be hot melted and contracted with the hot melting sleeve to tightly connect and lock the hot melting sleeve, and enabling the part of the reinforcing coating layer, extending out of the hot melting sleeve, to be hot melted and tightly connected to the outer coating layer of the composite pipe.
Preferably, in step S1, the method further includes arranging inner liners of the composite pipe cut and leaked at two sides into a mutually matched clamping structure.
Preferably, the clamping structure comprises a bump formed on the inner liner of the composite pipe leakage at one side along the circumferential spacing, and a groove formed on the inner liner of the composite pipe leakage at the other side along the circumferential spacing and matched with the bump.
The beneficial effects of the application are as follows: the application provides a nonmetallic joint for connecting composite pipes and a specific connecting method, which realize the tight connection of the composite pipes, and can effectively overcome the circumferential torsion external force and the opposite pulling force along the axial direction at the joint of the composite pipes after the connection, thereby improving the reliability of the connection. And the joint and the composite pipe adopt a hot melting butt joint mode, so that the sealing performance of the joint of the composite pipe is higher. And the hot melting sleeve of the joint adopts the same material as the inner liner of the composite pipe, so that the joint can be better closely connected, and meanwhile, the joint also has the same corrosion resistance, is convenient for synchronous replacement operation after long-period use, and reduces the difficulty of singly replacing the metal joint in advance.
Drawings
FIG. 1 is a schematic view of the joint according to the present application.
Fig. 2 is a schematic cross-sectional view of fig. 1 in accordance with the present application.
FIG. 3 is a state diagram of the composite pipe of the present application before butt joint.
Fig. 4 is a schematic plan view of an inner liner with bumps according to the present application.
Fig. 5 is a schematic plan view of an inner liner with grooves according to the present application.
Fig. 6 is a schematic diagram of the cooperation of fig. 4 and 5 according to the present application.
FIG. 7 is a schematic cross-sectional view of the composite tube of FIG. 3 according to the present application.
Fig. 8 is a view showing a state of the heat fusion of fig. 7 according to the present application.
Fig. 9 is a schematic view of a first fusion tool according to the present application.
Fig. 10 is a side view of a first fusion tool of the present application.
Fig. 11 is a state diagram of step S2 in the connection method of the present application.
Fig. 12 is a state diagram of step S3 in the connection method of the present application.
Fig. 13 is a state diagram of step S4 in the connection method of the present application.
Fig. 14 is a schematic view of a second fusion tool according to the present application.
Fig. 15 is a state diagram of step S5 in the connection method of the present application.
Fig. 16 is a state diagram (composite pipe connection forming diagram) of step S6 in the connection method of the present application.
Detailed Description
In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present application is further described below with reference to the accompanying drawings and examples.
Referring to the nonmetal connection joint for the composite pipe shown in fig. 1 to 16, the joint 1 is provided with a hot-melting sleeve 11 which is sleeved on the pipe ends of the composite pipes 2 at two sides in butt joint and has a certain width range, and the hot-melting sleeve 11 is coated with a reinforcing coating layer 12 which is tightly connected with the pipe ends of the composite pipes 2 at two sides in a hot-melting inward shrinking state together with the hot-melting sleeve 11. When the joint 1 is connected with the composite pipe 2, the pipe ends at the two sides are coated and hot-melted through the hot-melting sleeve, so that the hot-melting sleeve 11 is tightly locked with the pipe ends at the two sides through cooling after hot-melting. The hot melting sleeve 11 has a hot melting locking mode I, can be locked at the pipe end in the process of hot melting shrinking, eliminates the fit clearance between a common connecting joint and the pipe end, and can effectively improve the tightness of connection and the connection tightness of the pipe ends at two sides; secondly, under the normal condition, the pipe ends of the two-side composite pipe cannot reach the theoretical surface smoothness, and the common mechanical fastening connection mode ensures that the connecting joint cannot be tightly attached to the pipe end surface, so that the problem of poor air tightness exists. Therefore, the hot-melt sheath 11 and the hot-melt connection method of the joint 1 of the present application can effectively improve the air tightness and the fastening property of the composite pipe connection.
The reinforced coating layer 12 has the characteristic of simultaneously shrinking with the hot melting sleeve 11, further enhances the fastening effect of the hot melting sleeve 11 on pipe end connection, and simultaneously enhances the strength of the joint of the two side composite pipes 2 and the hot melting sleeve 11 on the basis of the close connection of the hot melting sleeve 11 by the reinforced coating layer 12, so that the joint of the composite pipes 2 has the same sealing performance and strength as the composite pipe 2 body or is higher than the composite pipe 2 after being connected through the joint 1.
In order to overcome the problem that the tightness of the joint is reduced or the two side composite pipes are easily separated due to the reverse tensile force after the two side composite pipes 2 are connected, as shown in fig. 2, the inner wall of the hot-melt sleeve 11 is configured to lock the two side composite pipes 2 in opposite directions and has a reverse butt-joint conical structure, the reverse butt-joint conical structure is composed of a first inclined surface 11a and a second inclined surface 11b which are symmetrically connected with the inner wall of the hot-melt sleeve 11, and the first inclined surface 11a and the second inclined surface 11b are gradually inclined from the joint of the two inclined surfaces toward the port and the axial direction of the hot-melt sleeve 11. The taper type locking diameters formed by the first inclined surface 11a and the second inclined surface 11b are respectively matched with the pipe ends on the corresponding sides, as shown in the actual connection diagram of the joint 1 shown in fig. 16, the taper type locking diameters formed by the inclined surfaces on the two sides respectively tighten the pipe ends on the sides towards the butt joint direction after the hot melting sleeve 11 is melted, so that the acting force of the reverse movement of the pipe body of the composite pipe 2 under the action of external force is overcome. Therefore, the two side pipe ends are pulled in opposite directions simultaneously through the taper locking diameters formed by the first inclined surface 11a and the second inclined surface 11b in the hot melting sleeve 11 respectively, so as to overcome the reverse movement caused by external force, and further ensure higher connection tightness.
In order to enable the reinforcing coating layer 12 to simultaneously coat the hot melting sleeve 11 and the pipe end of the composite pipe 2 so as to reduce more interfaces, the axial width of the reinforcing coating layer 12 along the joint 1 is larger than the width of the hot melting sleeve 11. As shown in fig. 12, the parts of the two ends of the reinforced coating layer 12 beyond the hot-melt sleeve 11 are contracted in the hot-melt, so that the interfaces of the hot-melt sleeve 11 and the pipe ends of the composite pipe 2 are coated and sealed, the number of the interfaces when the joint 1 is connected is effectively reduced, and the tightness of the connection is improved. Preferably, the end of the reinforcing coating layer 12 extending out of the hot melting sleeve 11 is set as an arc surface 12a, and the arc surface 12a can generate a relative sliding action with an external force component when external force impact is encountered, so that the problem that the external force action impacts the reinforcing coating layer 12 and the hot melting sleeve 11 after the composite pipe 2 is connected can be effectively avoided, and the fastening position of the joint 1 is ensured not to be interfered by the external force.
In order to enhance the sealing effect of the heat-melting and shrinking-in of the heat-melting sleeve 11, as shown in the practical connection diagram of fig. 16, the inner wall of the heat-melting sleeve 11 is closer to the axis of the joint 1 relative to the inner wall of the reinforced coating layer 12, and the effect is that the thickness of the heat-melting sleeve 11 relative to the reinforced coating layer 12 is increased on one hand, so that the heat-melting sleeve 11 has larger heat-melting amount after heat melting, the heat-melting and shrinking-in effect of the heat-melting sleeve can be better realized, and the heat-melting and shrinking-in effect can be more attached to the joint of the composite pipe 2; since the surface heights of the fifth and sixth inclined surfaces 3a and 3b of the bonding layer 3 of the composite pipe 2, which is ground after the butt joint, are lower than the height of the outer wall of the composite pipe 2, the other hand is to match the surface height of the lowered bonding layer 3.
In order to realize rapid and effective hot melting and heating of the hot melting sleeve 11, an electric heating wire (preferably a copper wire, not shown in the figure) is arranged in the hot melting sleeve 11, and a conductive hole 101 for conducting the electric heating wire is formed through the corresponding positions of the hot melting sleeve 11 and the reinforced coating layer 12. When the butt joint of the joint 1 and the composite pipe 2 is correspondingly sleeved, an external power supply is connected through the conductive hole 101, so that the copper wire generates heat, the hot melting sleeve 11 and the reinforcing coating layer 12 are heated and melted at the same time, and are powered off after being melted to a certain volume, so that the copper wire and the reinforcing coating layer are cooled and shrunk at the same time, and the butt joint and the outer pipe wall of the composite pipe 2 are shrunk and sealed at the same time.
Preferably, the hot-melting sleeve 11 is a PE material layer, and the reinforced coating layer 12 is a glass fiber and epoxy resin mixed material layer. The PE material has the advantages of good hot-melt property, uniformity, stable performance, good hot creep resistance, excellent long-term hydrostatic resistance, easy bending and aging resistance of the pipeline, long service life, meltability of the waste pipe and recoverability. The glass fiber has good insulativity, strong heat resistance, good corrosion resistance and high mechanical strength, and can effectively enhance the connection strength of the joint 1. The epoxy resin has the advantages of good bonding strength, good chemical resistance and the like, and can firmly bond the glass fiber and the PE hot melting sleeve 11 to form the joint 1 with high strength.
A method of joining composite pipes using a joint as described above, comprising the steps of:
s1, the composite pipe 2 butted by the joint 1 is sequentially provided with an inner liner 21, a reinforcing layer 22 and an outer coating layer 23 (the conventional composite pipe is the same and basically has the three-layer structure), wherein the inner liner 21 is preferably a PE material layer, the reinforcing layer 22 is preferably a polyester industrial filament layer, and the outer coating layer 23 is preferably a PE material layer. Because inner liner 21 and hot melt cover 11 are PE material layer, can better weld and better leakproofness to have synchronous corrosivity, make compound pipe and joint 1 have same cycle life, be convenient for whole maintenance or change operation. As shown in fig. 3, the joint 1 is first fitted over the body of the composite pipe 2 on one side, and then the reinforcing layer 22 and the outer coating layer 23 at the joint opening of the composite pipe 2 on each side are cut and the inner liner 21 having a certain joint width is leaked. In order to facilitate the rapid and accurate butt joint of the cut and leaked inner liners 21 with each other, it is preferable that the cut and leaked inner liners 21 of the composite tube 2 on both sides are provided with a mutually matched clamping structure.
Specifically, as shown in fig. 7, the fastening structure includes a protrusion 211 formed on the inner liner 21 of the outer leakage of the composite pipe 2 at one side along a circumferential distance, and a groove 212 formed on the inner liner 21 of the outer leakage of the composite pipe 2 at the other side along a circumferential distance and matched with the protrusion 211. Through the cooperation of the groove 212 of the lug 211, firstly, the lining layers 21 on two sides can be quickly butted, secondly, the circumferential relative rotation of the composite pipe 2 on two sides after the action of external force can be effectively overcome through the cooperation structure, the problem that the butted part of the composite pipe 2 is loose and separated under the circumferential rotation is avoided, and further, the circumferential tightness of the composite pipe 2 after connection is effectively improved. Since the bump 211 and the groove 212 have more connecting edges, which results in more interfaces, in order to reduce the number of the interfaces and improve the tightness of the butt joint, it is preferable that, as shown in a in fig. 7, the surface of the bump 211 is lower than the surface of the inner liner 21 leaking out; the inner liner 21 with the groove 212 connects the groove 212 and the bump 211 with a correspondingly reduced height to form a whole which is sealed in a surrounding manner, so that the part can be coated on the bump 211 after the bump 211 and the groove 212 are in butt joint (as shown in fig. 11), that is, the inner wall of the inner liner 21 with the groove 212 is provided with the groove 212 which is not communicated with the outer wall surface of the inner liner, so that the part of the groove 212 can coat the bump 211 after the butt joint, more matching interfaces of the part can be hidden, and the butt joint tightness of the inner liner 21 is improved. Meanwhile, after the convex blocks 211 are coated by the inner liner 21 with the grooves 212, the radial relative displacement of the pipe end matching can be effectively overcome.
Since the thickness of the inner liner 21 covering the bump 211 is reduced compared with the overall thickness of the inner liner 21 after the groove 212 is formed, when the pipe body moves relatively in the radial direction, the inner liner 21 of the covering portion is easily broken or the bump 211 is broken to affect the butt joint fastening function, so that in order to reduce the said opposing force, preferably, as shown in fig. 4, each bump 211 has a first circumferential side surface a and a second circumferential side surface b, the first and second side surfaces a and b are designed to have a slope structure with central symmetry of the bump 211 so as to form a trapezoid structure with radian of the bump 211 as a whole, and the groove 212 is formed to have a matched structure, because the bump 211 and the groove 212 have opposite trapezoid structures and the matched bump 211 and the groove 212 are circumferentially arranged, the matching directions of the bump 211 and the groove 212 symmetrical through the axis of the composite pipe 2 are opposite, and further the relative movement of the inner liner 21 in any radial direction after the butt joint is limited, and the radial fastening function after the connection of the composite pipe 2 is enhanced. The schematic diagram of this action is shown in fig. 6, which is a mating cross-section of the protrusion 211 and the groove 212, wherein in the a1 position, the groove 212 limits the protrusion 211 to move downwards, and in the a2 position, the groove 212 limits the protrusion 211 to move upwards, and similarly, the mating structure at other positions also has the symmetrical limiting action, so that after the protrusion 211 and the groove 212 of this structure are mated, the radial movement of the pipe body can be limited from the foundation of the butt-joint, and the radial relative movement of the butt joint of the composite pipe is further improved and the radial tightness is improved under the auxiliary action of the liner 21 coating the protrusion 211 on the radial limitation of the protrusion 211.
S2, as shown in fig. 8-10, the inner liners 21 leaked from the butted composite pipes 2 are in hot melting butt joint through a first hot melting tool, preferably, the first hot melting tool is provided with a heating plate 4 attached to the side walls of the inner liners 21 at two sides, the two sides of the heating plate 4 extend towards the inner liners 21 to support heat conducting parts 41, and one side of the heating plate 4 is provided with an insulating handle 42 and a conducting wire 43. The specific hot melting mode is as follows: the supporting heat conducting parts 41 on two sides are respectively penetrated in the inner liners 21 with the convex blocks 211 and the grooves 212, the corresponding inner liners 21 and the composite pipe 2 are supported, the side walls of the inner liners 21 on two sides can be guaranteed to be clung to the side wall surfaces of the heating plates 4 for effective and balanced heating operation, meanwhile, the supporting heat conducting parts 41 extend into the inner liners 21, and the leaked inner liners can be integrally heated by the effective auxiliary heating plates 4, so that the inner liners are quickly heated and melted. After a certain amount of melting body is melted, the first heat melting tool is taken out, the inner liners 21 on two sides are butted through the matching of the convex blocks 211 and the grooves 212 and cooled to a structure which is compact as a whole, the butted tightness and tightness of the inner liners 21 of the composite pipe are realized, and meanwhile, the effect of resisting the external force of circumferential torsion at the butted part of the composite pipe 2 is improved through the clamping structure. The joint of the inner liners 21 after the hot melt butt cooling is polished to smooth the surface of the inner liners 21 integrally connected in butt joint (as shown in fig. 11).
S3, as shown in FIG. 12, on the basis of the integral lining layer 21 after hot melt butt joint, a third inclined surface 21a and a fourth inclined surface 21b which are symmetrical and butt-jointed are ground from the center of the outer surface to the directions of the two-side composite pipes 2 in sequence, and the third inclined surface 21a and the fourth inclined surface 21b are gradually inclined towards the directions of the axes of the composite pipes 2 and the pipe bodies, so that a cone-shaped structure in which the surface of the integral lining layer 21 is inclined towards the two-side composite pipes 2 and butt-jointed symmetrically is formed.
And S4, as shown in fig. 13-14, the inner liner 21 which is integrally formed after hot melting and butt joint is hot-melted by a second hot melting tool, and meanwhile, the sealing layer 3 is hot-melted on the outer wall surface of the integral inner liner 21 with the third inclined surface 21a and the fourth inclined surface 21b, and the sealing layer 3 is enabled to be flush with the outer wall of the outer coating layer 23. Preferably, the second hot melting tool has a heating ring 5 with one end hinged open and fitted over the outer cladding 23 of the composite tube 2, and the heating ring 5 is connected with a wire 43.
The specific hot melting mode is as follows: the pipe ends of the composite pipes 2 are integrally heated through the heating rings 5 sleeved on the outer coating layers 23 of the composite pipes 2 at the two sides, and the heat is transferred to the butt-jointed inner liner 21, so that the inner liner 21 has a certain welding temperature, then the hot-welded sealing layers 3 are sequentially welded on the circumferential surfaces of the butt-jointed inner liner 21 and are always welded until the sealing layers are flush with the outer wall height of the outer coating layers 23, and the welding of the sealing layers 3 is completed. The inner surface of the sealing layer 3 is matched with the integral inner liner 21 to form the same taper structure in the process of hot melt cladding, and the practical effect is that the sealing layer 3 formed on the basis of the third inclined plane 21a and the fourth inclined plane 21b, especially the taper inner surface structure thereof, is tightly matched with the third inclined plane 21a and the fourth inclined plane 21b to tightly tighten the inner liners 2 butted by the composite pipes 2 at two sides in opposite directions at the same time so as to overcome the reverse tensile force of the composite pipes in the axial direction under the action of external force after the connection, and the tightness of the connection of the pipe end inner liners 21 is improved through the tightening effect.
S5, as shown in fig. 15, the fifth inclined surface 3a and the sixth inclined surface 3b that are sequentially matched with the first inclined surface 11a and the second inclined surface 11b of the heat-fusible sleeve 11 are ground on the outer surface of the sealing layer 3 in the same manner, so as to match the adhesion effect of the heat-fusible sleeve 11 after the first inclined surface 11a and the second inclined surface 11b are heat-fused. Preferably, the sealing layer 3 is made of PE, and is made of the same material as the inner liner 21 and the hot-melt jacket 11 of the composite pipe, so that the fusion can be performed better, and the sealing performance is high after the fusion.
S6, as shown in fig. 16, in the case where the fifth inclined surface 3a and the sixth inclined surface 3b are ground and formed, the joint 1 is moved until the first inclined surface 11a and the second inclined surface 11b correspond to the fifth inclined surface 3a and the sixth inclined surface 3b in this order, and at the same time, the second hot-melting tool is again put on the outer coating layer 23 of the composite pipe 2 to continue heating the pipe, and the heat is transferred to the sealing layer 3, so that the whole of the outer coating layer 23 and the sealing layer 3 is welded to the joint 1. And then the conductive holes 101 heat the hot-melt sleeve 11 to enable the hot-melt sleeve to be hot-melted and tightly connected to the sealing layer 3, and the effect is the same as the conical matching effect of the inner wall surface of the sealing layer 3 and the third inclined surface 21a and the fourth inclined surface 21b of the integral lining layer 21, and the effect is to overcome the axial counter-pulling force of the composite pipe 2 after butt joint, so that the tightness of pipe body connection is improved. Preferably, the hot-melt sheath 11 extends to both sides of the outer coating layer 23, and the ends of the composite pipe 2 on both sides are fusion-coated. The reinforced coating layer 12 is contracted with the hot melting sleeve 11 in a hot melting way, the hot melting sleeve 11 is tightly connected and locked, and meanwhile, the part of the reinforced coating layer 12 extending out of the hot melting sleeve 11 is tightly connected to the outer coating layer 23 of the composite pipe 2 in a hot melting way, so that the butt joint part of the composite pipe 2 is integrally coated. After the welding of the joint 1 is completed, the power is cut off for cooling, and the second welding tool is simultaneously cut off for disassembly.
The principle of the application is as follows: the application provides a nonmetallic joint for connecting composite pipes and a specific connecting method, which realize the tight connection of the composite pipes, and can effectively overcome the circumferential torsion external force and the opposite pulling force along the axial direction at the joint of the composite pipes after the connection, thereby improving the reliability of the connection. And the joint and the composite pipe adopt a hot melting butt joint mode, so that the sealing performance of the joint of the composite pipe is higher.
The foregoing has shown and described the basic principles, principal features and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the foregoing embodiments, which have been described in the foregoing description merely illustrates the principles of the application, and that various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined in the appended claims. The scope of the application is defined by the appended claims and equivalents thereof.
Claims (4)
1. The joint (1) is provided with a hot-melting sleeve (11) which is sleeved on the pipe ends of the two butted side composite pipes (2) at a certain width range, and a reinforcing coating layer (12) which is tightly connected with the pipe ends of the two side composite pipes (2) at the same time under the state of hot melting inward shrinkage of the hot-melting sleeve (11) is coated outside the hot-melting sleeve (11);
an electric heating wire is arranged in the hot melting sleeve (11), and a conductive hole (101) for conducting the electric heating wire is formed in a penetrating manner at the corresponding position of the hot melting sleeve (11) and the reinforced coating layer (12);
the inner wall of the hot melting sleeve (11) is provided with a conical structure which is used for locking the two sides of the composite pipe (2) in opposite directions and is in reverse butt joint, the conical structure which is in reverse butt joint consists of a first inclined surface (11 a) and a second inclined surface (11 b) which are symmetrically connected with the inner wall of the hot melting sleeve (11), and the first inclined surface (11 a) and the second inclined surface (11 b) are gradually inclined from the joint of the two inclined surfaces towards the port of the hot melting sleeve (11) and the axial direction;
the connection method comprises the following steps:
s1, sequentially arranging an inner liner (21), a reinforcing layer (22) and an outer coating layer (23) on the composite pipe (2) which is butted by the joint (1), firstly sleeving the joint (1) on a pipe body of the composite pipe (2) on one side, and then cutting the reinforcing layer (22) and the outer coating layer (23) at a pipe orifice where the composite pipe (2) is butted on each side, and leaking the inner liner (21) with a certain butting width;
the inner liners (21) which are externally leaked and cut by the composite pipe (2) at two sides are arranged into a mutually matched clamping structure, and the clamping structure comprises convex blocks (211) which are arranged on the inner liner (21) which is externally leaked and is externally leaked by the composite pipe (2) at one side along the circumferential interval, and grooves (212) which are arranged on the inner liner (21) which is externally leaked and is externally leaked by the composite pipe (2) at the other side along the circumferential interval and are matched with the convex blocks (211);
the surface of the lug (211) is lower than the surface of the inner liner (21);
the convex blocks (211) are arranged into trapezoid structures with radians, and the grooves (212) are arranged into matched trapezoid structures;
s2, hot melting the butted inner liners (21) leaked from the composite pipe (2) by a first hot melting tool, and polishing the joint of the hot-melted and cooled inner liners (21) to enable the surface of the inner liners (21) which are connected into a whole in a butt joint mode to be smooth;
s3, grinding a third inclined surface (21 a) and a fourth inclined surface (21 b) which are symmetrical and are in butt joint from the center of the outer surface to the directions of the composite pipes (2) on the two sides in sequence on the basis of the integral lining layer (21) after hot melt butt joint, wherein the third inclined surface (21 a) and the fourth inclined surface (21 b) are gradually inclined towards the axial directions of the composite pipes (2) and the pipe body;
s4, hot-melting the integrated inner liner (21) after hot-melting butt joint by a second hot-melting tool, and simultaneously hot-melting a sealing layer (3) on the outer wall surface of the integrated inner liner (21) with a third inclined surface (21 a) and a fourth inclined surface (21 b), so that the sealing layer (3) is flush with the outer wall of the outer coating layer (23);
s5, grinding a fifth inclined plane (3 a) and a sixth inclined plane (3 b) which are sequentially matched with the first inclined plane (11 a) and the second inclined plane (11 b) of the hot melting sleeve (11) on the outer surface of the sealing layer (3);
s6, moving the joint (1) to a first inclined plane (11 a) and a second inclined plane (11 b) which are sequentially corresponding to the fifth inclined plane (3 a) and the sixth inclined plane (3 b), then heating the hot melting sleeve (11) through the conductive hole (101) to enable the hot melting sleeve to be hot melted and tightly connected to the sealing layer (3), and enabling the reinforcing coating layer (12) to be hot melted and tightly connected to the sealing layer (3) in a shrinking mode, tightly connecting and locking the hot melting sleeve (11), and enabling a part of the reinforcing coating layer (12) extending out of the hot melting sleeve (11) to be hot melted and tightly connected to the outer coating layer (23) of the composite pipe (2).
2. The connection method according to claim 1, characterized in that: the reinforcing coating layer (12) is wider than the hot melting sleeve (11) along the axial direction of the joint (1).
3. The connection method according to claim 2, characterized in that: the inner wall of the hot melting sleeve (11) is closer to the axis of the joint (1) relative to the inner wall of the reinforcing coating layer (12).
4. A connection method according to claim 3, characterized in that: the hot melting sleeve (11) is a PE material layer, and the reinforced coating layer (12) is a glass fiber and epoxy resin mixed material layer.
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| CN113844000B (en) * | 2021-08-09 | 2023-05-12 | 宝鸡天联汇通复合材料有限公司 | Production process of large-caliber flexible composite pipe |
| CN117283880B (en) * | 2023-11-24 | 2024-02-13 | 中投(天津)智能管道股份有限公司 | Seamless hot-melting sleeve heat-insulation joint coating process |
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