Continuous fiber band winding composite pipe and preparation method thereof

Abstract

According to the continuous fiber band winding composite pipe and the preparation method thereof, the tensile ring is welded to the pipe head end of the composite pipe, the axial tension of the butt joint of the composite pipe is transferred from the stress of the butt joint opening to the stress of the composite pipe, and the axial tension resistance strength of the butt joint opening of the composite pipe is greatly improved. The thickening ring is welded outside the sealing ring, so that the compression strength of the butt fusion surface of the sealing ring is improved, and the compression requirement of the butt joint pipe joint is met. The concave ring is arranged on the sealing surface of the sealing ring, so that a continuous fiber band layer can be inserted into the sealing ring, and the compression strength of the welding sealing surface of the composite pipe end and the sealing ring is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipelines, and in particular to a continuous fiber tape wound composite pipe; in addition, the present invention also relates to a preparation method of the continuous fiber tape wound composite pipe. Background Art

[0002] Continuous fiber tape wound composite pipes have many advantages such as high pressure resistance, corrosion resistance, thin wall, light weight, etc., and are widely used in water supply, heat supply, oil transportation, gas transportation and other media fields. However, the existing continuous fiber tape wound composite pipes are not designed reasonably. The joints of the composite pipes not only have low axial tensile strength, low internal and external pressure resistance, but also low compressive strength of the sealing surface. Summary of the invention

[0003] In order to solve the problems existing in the prior art, at least one embodiment of the present invention provides a continuous fiber tape wound composite pipe, which greatly improves the axial tensile strength and internal and external pressure resistance of the composite pipe's interface, and also improves the compressive strength of the sealing surface. To this end, at least one embodiment of the present invention also provides a method for preparing a continuous fiber tape wound composite pipe.

[0004] In the first aspect, an embodiment of the present invention proposes a continuous fiber belt wrapped composite pipe, comprising an inner lining layer, a continuous fiber belt layer and an outer protective layer connected in sequence from the inside to the outside, and also comprising a sealing ring, a tensile ring and a thickening ring; the sealing ring is provided with a concave ring corresponding to the continuous fiber belt layer, the end of the continuous fiber belt layer is socket-connected to the ring wall of the concave ring, and the ends of the inner lining layer and the outer protective layer are respectively connected to the sealing surface of the sealing ring; the inner surface of the tensile ring is connected to the outer surface of the outer protective layer, one end of the tensile ring is connected to the sealing ring, and the inner surface of the thickening ring is connected to the outer surface of the sealing ring.

[0005] In some embodiments, the present invention provides a continuous fiber tape wound composite tube, wherein the continuous fiber tape layer is inserted into a concave ring and welded to the ring wall of the concave ring.

[0006] In some embodiments, the present invention provides a continuous fiber tape wound composite tube, wherein the inner surface of the tensile ring is welded to the outer surface of the outer protective layer.

[0007] In some embodiments, the present invention provides a continuous fiber belt wrapped composite tube, wherein the tensile ring is made of plastic material, one end of the tensile ring is welded to the sealing ring, and the inner wall of the tensile ring is socket-welded to the outer wall of the outer protective layer.

[0008] In some embodiments, the present invention provides a continuous fiber tape wound composite tube, wherein the inner surface of the thickening ring is welded to the outer surface of the sealing ring.

[0009] In some embodiments, the present invention provides a continuous fiber tape wound composite tube, wherein the end of the thickening ring extends to the end of the tensile ring.

[0010] In some embodiments, the present invention provides a continuous fiber tape wound composite tube, wherein the inner surface of the thickening ring is respectively welded to the outer surfaces of the sealing ring and the tensile ring.

[0011] In some embodiments, the present invention provides a continuous fiber band wound composite tube, wherein the tensile ring is made of horizontally and vertically crossed continuous fiber bands, and the tensile ring is fused to the outer wall of the outer protective layer and the outer wall of the sealing ring.

[0012] In a second aspect, an embodiment of the present invention further provides a preparation method of the first aspect, comprising: Cut the inner lining layer and the outer protective layer of the end of the composite pipe wrapped with the continuous fiber tape so that the exposed length of the continuous fiber tape layer is equal to the depth of the concave ring in the sealing ring; The outer wall of the end of the continuous fiber tape wound composite pipe, the sealing surface of the sealing ring, the wall of the concave ring of the sealing ring, and the inner wall of the tensile ring are heated simultaneously and maintained for 10-20 minutes; Under a static pressure thrust of 4MPa, the inner wall of the tensile ring is socket-fused to the outer wall of the continuous fiber tape wound composite pipe, the sealing surface of the sealing ring with the thickening ring is melt-bonded to the end of the continuous fiber tape wound composite pipe, the exposed continuous fiber tape layer is socket-fused to the concave ring, and kept for more than 20 minutes to cool and set.

[0013] In some embodiments, the preparation method provided by the present invention simultaneously heats the end of the continuous fiber tape wrapped composite tube and the sealing ring through a hot melt plate; under a static pressure thrust of 4MPa, the sealing ring and the end of the continuous fiber tape wrapped composite tube are melted and bonded by a hydraulic butt joint machine; the end faces of the two cooled and shaped continuous fiber tape wrapped composite tubes are heated and butt-fused, and a continuous glass fiber tape crossed at 90 degrees is wrapped around the fused center position for multiple turns to form a glass fiber tape wrapped butt joint interface.

[0014] It can be seen that the continuous fiber tape wrapped composite pipe and the preparation method thereof in the embodiment of the present invention, by welding a tensile ring at the pipe head end of the composite pipe, transfers the axial tensile force of the composite pipe joint from the force of the joint to the force of the composite pipe, thereby greatly improving the axial tensile strength of the joint of the composite pipe. By welding a thickening ring outside the sealing ring, the compressive strength of the sealing ring butt fusion surface is improved to meet the pressure resistance requirements of the butt pipe joint. By providing a concave ring on the sealing surface of the sealing ring, it can be inserted into the continuous fiber tape layer, which greatly improves the compressive strength of the welded sealing surface between the composite pipe end and the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 The first structure schematic diagram of a continuous fiber tape wound composite tube according to an embodiment of the present invention is shown; Figure 2 The second structure of a continuous fiber tape wound composite tube according to an embodiment of the present invention is shown; Figure 3 It is a schematic diagram of the third structure of a continuous fiber tape wound composite tube in an embodiment of the present invention.

[0017] The reference numerals in the accompanying drawings of the specification are as follows: Inner lining layer 1, continuous fiber belt layer 2, outer protective layer 3, sealing ring 4, concave ring 41, tensile ring 5, thickening ring 6. Specific implementation plan

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this article, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0020] [Example 1] The inventor of this solution found that in the prior art, the design of the continuous fiber band wrapped composite pipe is unreasonable, the joint of the composite pipe not only has low axial tensile strength, low internal and external pressure resistance, but also low compressive strength of the sealing surface. The embodiment of the present invention provides the following solution: like Figure 1 As shown, an embodiment of the present invention provides a continuous fiber tape wound composite pipe, comprising an inner lining layer 1, a continuous fiber tape layer 2 and an outer protective layer 3 connected in sequence from the inside to the outside, and also comprising a sealing ring 4, a tensile ring 5 and a thickening ring 6. The sealing ring 4 is provided with a concave ring 41 corresponding to the continuous fiber tape layer 2, the end of the continuous fiber tape layer 2 is connected to the ring wall of the concave ring 41, and the ends of the inner lining layer 1 and the outer protective layer 3 are respectively connected to the sealing surface of the sealing ring 4. The inner surface of the tensile ring 5 is connected to the outer surface of the outer protective layer 3, one end of the tensile ring 5 is connected to the sealing ring 4, and the inner surface of the thickening ring 6 is connected to the outer surface of the sealing ring 4.

[0021] In some embodiments, the continuous fiber belt layer 2 is inserted into the concave ring 41 and welded to the ring wall of the concave ring 41, the inner surface of the tensile ring 5 is welded to the outer surface of the outer protective layer 3, one end of the tensile ring 5 is welded to the sealing ring 4, the inner surface of the thickening ring 6 is welded to the outer surface of the sealing ring 4, and the ends of the inner lining layer 1 and the outer protective layer 3 are respectively welded to the sealing surfaces of the sealing ring 4.

[0022] It should be noted that after the tensile ring 5 is fused with the outer wall of the end of the composite pipe, it plays a role in enhancing the overall axial pull-out resistance of the end joint of the composite pipe. After the sealing ring 4 is fused with the end of the composite pipe, it plays a role in sealing the end of the composite pipe. After the thickening ring 6 is fused with the sealing ring 4, it plays a role in thickening and strengthening the overall resistance of the sealing ring 4 to the annular inward pressure. After the concave ring 41 is plugged and fused with the continuous fiber belt layer 2, it plays a role in compensating for and enhancing the strength of the sealing surface of the sealing ring 4 to resist the internal pressure, and preventing the sealing surface from failing due to internal pressure, causing the internal pressure water to escape into the inner wall of the plastic layer at the end of the pipe and break and leak. The side walls of the sealing rings 4 of the two continuous fiber belts of the present invention are fused and connected, and the two continuous fiber belts wrapped around the composite pipes are combined and connected together. According to the needs of different scenarios, multiple continuous fiber belts wrapped around the composite pipes of the present invention can be fused and connected.

[0023] In some embodiments, Figure 2 As shown, the end of the thickened ring 6 extends to the end of the tensile ring 5, and the inner surface of the thickened ring 6 is respectively welded to the outer surfaces of the sealing ring 4 and the tensile ring 5, thereby further enhancing the overall resistance of the sealing ring 4 to the inward pressure and axial tension.

[0024] In some embodiments, Figure 3As shown, the tensile ring 5 and the sealing ring 4 are arranged in mirror symmetry to form a double-tube head connecting ring, the sealing ring 4 is welded to the bottom of the tensile ring 5, and a composite tube is welded at each end. The outer surface of the tensile ring 5 and the outer wall of the composite tube end are integrally welded with horizontally and vertically crossed continuous fiber bands, thereby effectively preventing the butt-welded surface of the two composite tube ends and the sealing ring 4 from cracking and leaking and improving the effect of the butt-welded surface on resisting axial tension.

[0025] It should be noted that the transverse continuous fiber belt plays a role in enhancing the overall resistance of the double-tube head connection ring to axial tensile force, while the vertical continuous fiber belt plays a role in enhancing the overall resistance of the double-tube head connection ring to hoop stress, that is, to resist internal pressure.

[0026] [Example 2] The present invention also provides a preparation method of Example 1, comprising: The inner lining layer and the outer protective layer of the end of the composite pipe wrapped with the continuous fiber tape are cut so that the exposed length of the continuous fiber tape layer is equal to the depth of the concave ring in the sealing ring.

[0027] In some embodiments, the nominal pressure of the continuous fiber strip wrapped composite pipe is 1.6 MPa, the inner diameter of the tensile ring 5 is 946 mm, the outer diameter is 976 mm, and the length is 200 mm. The length of the sealing ring 4 is 50 mm. The width of the concave ring 41 is 36 mm and the depth is 15 mm.

[0028] The outer wall of the end of the continuous fiber tape-wound composite pipe, the sealing surface of the sealing ring 4, the wall of the concave ring 41 of the sealing ring 4, and the inner wall of the tensile ring 5 are heated simultaneously and maintained for 10-20 minutes.

[0029] In some embodiments, the continuous fiber tape-wound composite pipe and the sealing ring 4 are fixed separately, and with the assistance of a hydraulic butt joint machine, the ends of the continuous fiber tape-wound composite pipe and the sealing ring 4 are heated simultaneously by a hot melt plate.

[0030] Under a static pressure thrust of 4 MPa, the inner wall of the tensile ring 5 is socket-fused to the outer wall of the continuous fiber tape wound composite pipe, the sealing surface of the sealing ring 4 with the thickening ring 6 is melted to the end of the continuous fiber tape wound composite pipe, the exposed continuous fiber tape layer 2 is socket-fused to the concave ring, and kept for more than 20 minutes to cool and shape.

[0031] In some embodiments, after the hot melt plate is taken out, the sealing ring 4 is melted and attached to the end of the continuous fiber tape wrapped composite pipe by a hydraulic butt joint machine under a static pressure thrust of 4 MPa, and then cooled naturally after being kept for more than 20 minutes. The end faces of the two cooled and shaped continuous fiber tape wrapped composite pipes are heated and butted and fused, and the continuous glass fiber tape crossed at 90 degrees is wound around the fused center position for multiple turns to form a glass fiber tape wrapped butt joint interface.

[0032] In some embodiments, several meters of 300mm wide horizontal and vertical cross continuous fiber belts are selected and, with the assistance of a winding machine, are melted onto the outer wall of the butt connector, i.e., the outer wall of the tensile ring 5 and the sealing ring 4, to form a high-resistant composite connector for use in trenchless hosting or direct buried pipelines.

[0033] In some embodiments, a hot melt plate is used to heat the outer wall of the sealing ring 4 of the two continuous fiber tapes of the present invention wrapped composite pipe for 10-20 minutes at the same time. The hot melt plate is taken out, and the sealing rings 4 are quickly welded with the assistance of a hydraulic press, and the static pressure thrust of 4MPa is maintained for more than 20 minutes before natural cooling. Multiple continuous fiber tapes of the present invention can be fused and connected by wrapping composite pipes according to different scene requirements.

[0034] In summary, embodiments 1-2 of the present invention provide a continuous fiber tape-wrapped composite pipe and a preparation method thereof. By welding a tensile ring at the pipe head end of the composite pipe, the axial tensile force of the composite pipe joint is transferred from the force of the joint to the force of the composite pipe, which greatly improves the axial tensile strength of the joint of the composite pipe. By welding a thickening ring outside the sealing ring, the compressive strength of the sealing ring butt fusion surface is improved to meet the pressure resistance requirements of the butt joint. By providing a concave ring on the sealing surface of the sealing ring, it can be inserted into the continuous fiber tape layer, which greatly improves the compressive strength of the welded sealing surface between the composite pipe end and the sealing ring.

[0035] The above contents are only specific implementation methods of the present application, and the protection scope of the present application is not limited thereto. Those skilled in the art may make changes or substitutions within the technical scope disclosed in the present application, and these changes or substitutions shall be within the protection scope of the present application.

[0036] Those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is meant to be within the scope of the present invention and to form different embodiments.

[0037] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A continuous fiber tape wound composite pipe, comprising an inner lining layer (1), a continuous fiber tape layer (2) and an outer protective layer (3) connected in sequence from the inside to the outside, characterized in that: It also includes a sealing ring (4), a tensile ring (5) and a thickening ring (6); the sealing ring (4) is provided with a concave ring (41) corresponding to the continuous fiber belt layer (2); the end of the continuous fiber belt layer (2) is connected to the ring wall of the concave ring (41) by a socket connection; the ends of the inner lining layer (1) and the outer protective layer (3) are respectively connected to the sealing surface of the sealing ring (4); the inner surface of the tensile ring (5) is connected to the outer surface of the outer protective layer (3); one end of the tensile ring (5) is connected to the sealing ring (4); and the inner surface of the thickening ring (6) is connected to the outer surface of the sealing ring (4).

2. The continuous fiber tape wound composite pipe according to claim 1, characterized in that: The continuous fiber belt layer (2) is inserted into the concave ring (41) and is welded to the ring wall of the concave ring (41).

3. The continuous fiber tape wound composite pipe according to claim 1, characterized in that: The inner surface of the tensile ring (5) is welded to the outer surface of the outer protective layer (3).

4. The continuous fiber tape wound composite pipe according to claim 1, characterized in that: The anti-tension ring (5) is made of plastic material, one end of the anti-tension ring (5) is fused to the sealing ring (4), and the inner wall of the anti-tension ring (5) is socket-fused to the outer wall of the outer protective layer (3).

5. The continuous fiber tape wound composite pipe according to claim 1, characterized in that: The inner surface of the thickened ring (6) is welded to the outer surface of the sealing ring (4).

6. The continuous fiber tape wound composite pipe according to claim 1, characterized in that: The end of the thickened ring (6) extends to the end of the tensile ring (5).

7. The continuous fiber tape wound composite pipe according to claim 6, characterized in that: The inner surface of the thickened ring (6) is respectively welded to the outer surfaces of the sealing ring (4) and the tensile ring (5).

8. The continuous fiber tape wound composite pipe according to claim 1, characterized in that: The anti-tension ring (5) is made of horizontally and vertically crossed continuous fiber bands, and the anti-tension ring (5) is fused to the outer wall of the outer protective layer (3) and the outer wall of the sealing ring (4).

9. A method for preparing a continuous fiber tape wound composite tube as claimed in any one of claims 1 to 8, characterized in that: include: Cut the inner lining layer and the outer protective layer of the end of the composite pipe wrapped with the continuous fiber tape so that the exposed length of the continuous fiber tape layer is equal to the depth of the concave ring in the sealing ring; The outer wall of the end of the continuous fiber tape wound composite tube, the sealing surface of the sealing ring, the wall of the concave ring of the sealing ring, and the inner wall of the tensile ring are heated simultaneously and maintained for 10-20 minutes; Under a static pressure thrust of 4 MPa, the inner wall of the tensile ring is socket-fused to the outer wall of the continuous fiber tape wrapped composite pipe, the sealing surface of the sealing ring with the thickening ring is melt-fused to the end of the continuous fiber tape wrapped composite pipe, the exposed continuous fiber tape layer is socket-fused to the concave ring, and kept for more than 20 minutes to cool and shape.

10. The preparation method according to claim 9, characterized in that: The end of the continuous fiber tape wrapped composite pipe and the sealing ring are heated simultaneously by a hot melt plate; the sealing ring and the end of the continuous fiber tape wrapped composite pipe are melted and bonded by a hydraulic butt joint machine under a static pressure thrust of 4MPa; the end faces of the two cooled and shaped continuous fiber tape wrapped composite pipes are heated and butt-fused, and the continuous glass fiber tape crossed at 90 degrees is wound around the fused center position for multiple turns to form a glass fiber tape wrapped butt joint interface.

Images