Method for manufacturing composite pipe and composite pipe production apparatus

Abstract

This invention relates to the field of composite pipe technology, and discloses a method for manufacturing composite pipes and equipment for producing composite pipes. The method includes the following steps: S100, manufacturing a core pipe using a core pipe production line; S200, covering the outside of the core pipe with a corrugated metal protective layer; S300, coating and / or wrapping an anti-corrosion layer around the outside of the corrugated metal protective layer; S400, covering the outside of the anti-corrosion layer with a plastic outer protective layer to obtain the composite pipe. The composite pipe manufacturing method of this invention, by setting a corrugated metal protective layer on the outside of the core pipe, gives the pipe better rigidity, increasing its axial tensile strength and resistance to external pressure; by covering the outside of the anti-corrosion layer with a plastic outer protective layer, the scratch-resistant and wear-resistant properties of the plastic material are utilized to further protect the anti-corrosion layer and the corrugated metal outer protective layer. Furthermore, the composite pipe manufacturing method of this invention has the advantage of continuous production.

Description

Technical Field

[0001] This invention relates to the field of composite pipe technology, specifically to a method for manufacturing composite pipes. Furthermore, it relates to composite pipe production equipment. Background Technology

[0002] Reinforced thermoplastic pipes (RTP) can be categorized based on their application scenarios, including wellhead pipes for oil extraction (used between oil wells and separation stations, gathering stations, and water injection stations), downhole pipes, marine transport pipes, and pipes for offshore oil platforms.

[0003] Existing RTP pipes are prone to damage and failure of the reinforcing layer under the repeated impact of waves during offshore platforms or marine transportation. In addition, downhole pipes are easily damaged by axial tensile forces such as their own vertical downward gravity during installation and use.

[0004] Therefore, there is a need to provide a method for manufacturing composite pipes, which produces pipes with good corrosion resistance and excellent mechanical properties. Summary of the Invention

[0005] The purpose of this invention is to provide a method for manufacturing composite pipes, which has the advantage of being able to manufacture composite pipes with good corrosion resistance and excellent mechanical properties.

[0006] To achieve the above objectives, the present invention provides a method for manufacturing composite pipes, characterized in that the method includes the following steps:

[0007] S100, Core tubes are manufactured from the core tube production line;

[0008] S200, A corrugated metal protective layer is wrapped around the outside of the core tube;

[0009] S300. Apply and / or wrap an anti-corrosion layer on the outside of the corrugated metal protective layer;

[0010] S400, A composite pipe is obtained by covering the outside of the anti-corrosion layer with a plastic outer protective layer.

[0011] Optionally, step S100 includes the following sub-steps:

[0012] S110. The plastic inner layer raw material is extruded by a plastic inner layer extruder with a plastic inner layer mold and conveyed to the first vacuum cooling device for cooling and shaping to obtain a plastic inner layer tube.

[0013] S120. The plastic inner tube is pulled out of the first vacuum cooling device by the first traction machine;

[0014] S130. A reinforcing layer is wound around the outside of the plastic inner tube by a winding machine unit to obtain a first core tube semi-finished product.

[0015] S140. The plastic outer layer raw material is extruded to the outside of the first core tube semi-finished product by a plastic outer layer extruder with a plastic outer layer mold to obtain the second core tube semi-finished product.

[0016] S150. The second core tube semi-finished product is transported to the second vacuum cooling device for cooling and shaping to obtain the core tube;

[0017] S160, The core tube is pulled out of the second vacuum cooling device by the second traction machine.

[0018] Optionally, step S100 also includes the following sub-steps performed after sub-step S130 and before sub-step S140:

[0019] S131. The first core tube semi-finished product is heated by the first oven;

[0020] S132, The first core tube semi-finished product heated by the first air ring is cooled;

[0021] S133. An adhesive is extruded to the outside of the reinforcing layer by an adhesive extruder with an adhesive extrusion die, and / or a finishing material is extruded to the outside of the reinforcing layer by a finishing extruder with a finishing die;

[0022] S134, The first core tube semi-finished product is cooled by the second air ring.

[0023] Optionally, step S100 further includes the following sub-steps performed after sub-step S140 and before sub-step S150:

[0024] S141, The second core tube semi-finished product is cooled by the third air ring.

[0025] Optionally, the first vacuum cooling device includes a first vacuum spray cooling water tank and a second vacuum spray cooling water tank arranged sequentially along the pipe outlet direction.

[0026] The second vacuum cooling device includes a third vacuum spray cooling water tank and a fourth vacuum spray cooling water tank arranged sequentially along the pipe outlet direction.

[0027] The winding machine unit includes multiple winding machines, and a second drying oven and a fourth air ring are arranged sequentially between two adjacent winding machines along the pipe outlet direction.

[0028] Optionally, the method further includes the following sub-steps performed after step S100 and between step S200:

[0029] S170, A sliding layer is fitted onto the outside of the core tube by a sliding material setting unit.

[0030] Optionally, step S200 includes the following sub-steps:

[0031] S210. A steel strip is wrapped around the outside of the core tube by a steel strip cold bending forming unit, and the longitudinal joint of the steel strip is welded by a longitudinal welding device to obtain the first composite pipe semi-finished product.

[0032] S220, The steel strip is corrugated on the outside by a corrugating machine to form the metal corrugation protection.

[0033] Optionally, step S200 may also include performing the following sub-steps prior to sub-step S210:

[0034] S201, The steel strip material is released by the steel strip unwinding machine;

[0035] S202, The steel strip is obtained by cutting off both sides of the steel strip material in a direction perpendicular to the width of the steel strip material by a cutting machine.

[0036] Optionally, step S200 also includes the following sub-steps performed after sub-step S201 and before sub-step S202:

[0037] S2011. The steel strip is cut by a shearing machine in a direction perpendicular to the length of the steel strip.

[0038] S2012, The steel strip material is welded in the width direction of the steel strip material by a cross-welding station;

[0039] S2013, The first delivery machine transports the sheared steel strip material into the storage frame;

[0040] S2014. The second delivery machine transports the steel strip material in the storage frame to the tension detection device.

[0041] Optionally, step S200 may also include the following steps performed after sub-step S210 and before sub-step S220:

[0042] S211, The first composite pipe semi-finished product is pulled out by the steel strip cold bending forming unit by the third traction machine.

[0043] Optionally, step S300 includes the following sub-steps:

[0044] S310, The anti-corrosion coating is applied and / or wrapped around the outside of the metal corrugated protective layer by an anti-corrosion coating and drying unit.

[0045] Optionally, sub-step S310 further includes: wrapping a polyester film around the outside of the anti-corrosion layer by a wrapping machine.

[0046] Optionally, the anti-corrosion layer is at least one of an asphalt-coated anti-corrosion layer, an asphalt cloth-wrapped anti-corrosion layer, or a heavy-duty anti-corrosion paint anti-corrosion layer.

[0047] Optionally, step S400 includes the following sub-steps:

[0048] S410. A plastic outer protective layer raw material is extruded to the outside of the anti-corrosion layer by a plastic outer extruder with a plastic outer mold to obtain a second composite pipe semi-finished product.

[0049] S420. The second composite pipe semi-finished product is transported to the third vacuum cooling device for cooling and shaping to obtain the composite pipe.

[0050] Optionally, step S400 also includes the following sub-steps performed after sub-step S410 and before sub-step S420:

[0051] S411, The second composite pipe semi-finished product is cooled by the fourth air ring.

[0052] Optionally, step S400 may also include the following sub-steps performed after sub-step S420:

[0053] S430, The composite pipe is pulled out of the third vacuum cooling device by the fourth traction machine.

[0054] Optionally, the third vacuum cooling device includes a fifth vacuum spray cooling water tank and a sixth vacuum spray cooling water tank arranged sequentially along the outlet direction of the pipe.

[0055] Optionally, the method further includes the following steps after step S400:

[0056] S500, the composite pipe is wound up to the work station.

[0057] Optionally, step S500 further includes the following sub-steps:

[0058] S510. The composite pipe is cut by a pipe cutting machine;

[0059] S520, The cut composite pipe is wound up to the work station by the winding machine.

[0060] A second aspect of the present invention provides a composite pipe production equipment, wherein the composite pipe production equipment is configured to perform the above-described composite pipe manufacturing method.

[0061] Optionally, the composite pipe production equipment includes a core pipe conveying channel.

[0062] A third aspect of the present invention provides a composite pipe production equipment, the composite pipe production equipment being configured to perform the above-described composite pipe manufacturing method, the composite pipe production equipment including a core pipe conveying channel formed by a plurality of pipe overhead frames, the pipe overhead frames being used to support the core pipe such that the height of the core pipe is higher than any one of the steel strip uncoiling machine, the edge trimming machine, the shearing machine, the strip welding station, the first delivery machine, the strip storage frame, the second delivery machine, and the tension detection device.

[0063] The composite pipe manufacturing method of this invention improves pipe rigidity by adding a corrugated metal protective layer to the outside of the core tube, increasing the pipe's axial tensile strength and resistance to external pressure. Furthermore, by covering the anti-corrosion layer with a plastic outer protective layer, the scratch-resistant and wear-resistant properties of plastic further protect both the anti-corrosion layer and the corrugated metal outer protective layer. In addition, the composite pipe manufacturing method of this invention offers the advantage of continuous production, avoiding problems such as pipe non-roundness or damage to the reinforcing layer that may occur after the core tube is wound and then unwound. Attached Figure Description

[0064] Figures 1 to 3 This is a top view of one embodiment of the composite pipe production equipment of the present invention;

[0065] Figures 4 to 6 yes Figures 1 to 3 Elevation view of the composite pipe production equipment;

[0066] Figures 7 to 10 This is a top view of another embodiment of the composite pipe production equipment of the present invention;

[0067] Figures 11 to 14 yes Figures 7 to 10 Elevation view of the composite pipe production equipment;

[0068] Figure 15 This is an angled schematic diagram of the process of applying a protective layer to the outside of the core tube in this invention;

[0069] Figure 16 yes Figure 15 Top view;

[0070] Figure 17 This is one embodiment of the composite pipe in this invention.

[0071] Explanation of reference numerals in the attached figures

[0072] 10-Core tube; 11-Plastic inner tube; 12-Reinforcing layer; 13-First core tube semi-finished product; 14-Plastic outer layer; 15-Second core tube semi-finished product; 16-Sliding layer; 20-Steel strip raw material; 22-Metal corrugated protective layer; 23-Anti-corrosion layer; 24-Polyester film; 25-Plastic outer protective layer; 30-Composite pipe; 31-First composite pipe semi-finished product; 32-Second composite pipe semi-finished product; 40-Steel strip; 101-Plastic inner layer extruder ; 102-Plastic inner layer mold; 103-First vacuum spray cooling water tank; 104-Second vacuum spray cooling water tank; 105-First traction machine; 106-Wrapping machine; 107-Second drying oven; 108-Fourth air ring; 109-First drying oven; 110-First air ring; 111-Finishing mold; 112-Finishing extruder; 113-Second air ring; 114-Plastic outer layer mold; 115-Plastic outer layer extruder; 116-Third 119-Second traction machine; 120-Strip uncoiling machine; 121-Shearing machine; 122-Strip welding station; 123-First delivery machine; 124-Strip storage frame; 125-Second delivery machine; 126-Tension detection device; 127-Edge trimming machine; 128-Strip cold bending forming unit; 129-Longitudinal welding device; 130-Third traction machine; 131-Ribing machine; 132-Anticorrosion coating drying unit; 133-Wrapping machine; 134- 135 - Plastic jacket mold; 136 - Fourth air ring; 137 - Fifth vacuum spray cooling water tank; 138 - Sixth vacuum spray cooling water tank; 139 - Fourth traction machine; 140 - Pipe cutting machine; 141 - Winding machine; 201 - Pipe overhead frame; 210 - First vacuum cooling device; 220 - Winding unit; 230 - Second vacuum cooling device; 240 - Third vacuum cooling device; A - Pipe exit direction. Detailed Implementation

[0073] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the orientation shown in the accompanying drawings, and "inner" and "outer" refer to the inner and outer sides relative to the outline of each component itself.

[0074] like Figures 1 to 14 As shown, one aspect of the present invention provides a method for manufacturing composite pipes, through which the following can be obtained: Figure 17 The method for the composite pipe shown includes the following steps:

[0075] S100, Core tube 10 is manufactured by the core tube production line;

[0076] S200, A corrugated metal protective layer 22 is wrapped around the outside of the core tube 10;

[0077] S300, apply and / or wrap an anti-corrosion layer 23 around the outside of the corrugated metal protective layer 22;

[0078] S400, a composite pipe 30 is obtained by wrapping a plastic outer protective layer 25 around the outside of the anti-corrosion layer 23.

[0079] The composite pipe manufacturing method of this invention provides better rigidity to the pipe by setting a metal corrugated protective layer 22 on the outside of the core tube 10, thereby increasing the axial tensile strength and external pressure resistance of the composite pipe 30. Furthermore, by covering the anti-corrosion layer 23 with a plastic outer protective layer 25, the scratch-resistant and wear-resistant properties of the plastic material are utilized to further protect the anti-corrosion layer 23 and the metal corrugated outer protective layer 22. In addition, the composite pipe manufacturing method of this invention has the advantage of continuous production, avoiding problems such as pipe non-roundness or damage to the reinforcing layer 12 that may occur after the core tube 10 is wound and then unwound.

[0080] The advantages of the composite pipe manufacturing method of the present invention will be introduced below through several implementation methods.

[0081] Example 1

[0082] like Figures 1 to 6 As shown, in one embodiment of the present invention, the method for manufacturing composite pipes includes the following steps:

[0083] S110, The plastic inner layer raw material is extruded by the plastic inner layer extruder 101 with the plastic inner layer mold 102 and transported to the first vacuum cooling device 210 for cooling and shaping to obtain the plastic inner layer tube 11.

[0084] S120, The plastic inner tube 11 is pulled out of the first vacuum cooling device 210 by the first traction machine 105;

[0085] S130, The reinforcing layer 12 is wound around the outside of the plastic inner tube 11 by the winding machine unit 220, and the first core tube semi-finished product 13 is obtained;

[0086] S140. The plastic outer layer raw material is extruded to the outside of the first core tube semi-finished product 13 by the plastic outer layer extruder 115 with the plastic outer layer mold 114 to obtain the second core tube semi-finished product 15.

[0087] S150, The second core tube semi-finished product 15 is transported to the second vacuum cooling device 230 for cooling and shaping to obtain the core tube 10;

[0088] S160, The core tube 10 is pulled out of the second vacuum cooling device 230 by the second traction machine 119;

[0089] S210, A steel strip 40 is wrapped around the outside of the core tube 10 by a steel strip cold bending forming unit 128, and the longitudinal joint of the steel strip 40 is welded by a longitudinal welding device 129 to obtain the first composite pipe semi-finished product 31.

[0090] S220, The steel strip 40 is corrugated by the corrugating mill 131 to form the metal corrugated protective layer 22 on the outer side of the steel strip 40;

[0091] S310, The anti-corrosion coating and drying unit 132 coats and / or wraps the anti-corrosion layer 23 on the outside of the metal corrugated protective layer 22;

[0092] S410. The plastic protective outer layer raw material is extruded to the outside of the anti-corrosion layer 23 by a plastic outer mold 135 with a plastic outer mold 134 to obtain the second composite pipe semi-finished product 32.

[0093] S420, the second composite pipe semi-finished product 32 is transported to the third vacuum cooling device 240 for cooling and shaping to obtain the composite pipe 30;

[0094] S500, the composite pipe 30 is wound up to the work station.

[0095] In the above method, steps S110 to S160 can be implemented by existing core tube production lines, such as pure PE pipe production lines, steel wire mesh reinforced polyethylene composite pipe production lines, or tape-reinforced RTP pipe production lines. In tape-reinforced RTP pipe production lines, the material of the reinforcing layer can be fiberglass tape, steel wire tape, steel cord tape, polyester tape, etc.

[0096] Furthermore, the first vacuum cooling device 210 in step S120 may include a first vacuum spray cooling water tank 103 and a second vacuum spray cooling water tank 104 arranged sequentially along the pipe outlet direction A; the second vacuum cooling device 230 in step S150 may include a third vacuum spray cooling water tank 117 and a fourth vacuum spray cooling water tank 118 arranged sequentially along the pipe outlet direction A; and the third vacuum cooling device 240 in step S420 may include a fifth vacuum spray cooling water tank 137 and a sixth vacuum spray cooling water tank 138 arranged sequentially along the pipe outlet direction A. It is understood that the number of vacuum spray cooling water tanks can be determined based on the production speed and the pipe wall thickness.

[0097] In step S210, after the core tube 10 is completely covered by the tubular steel strip 40, the steel strip 40 is welded into a straight seam steel pipe by the longitudinal welding device 129. Further, as... Figures 15 to 16As shown, in step S220, a straight seam steel pipe with a circular cross-section is rolled into a corrugated shape using a corrugating mill 131. The inner diameter of the trough of the corrugation can be equal to or slightly smaller than the outer diameter of the core tube 10. The purpose of rolling the straight seam steel pipe into a corrugated shape in this step is to prevent the composite pipe 30 from being unable to be coiled due to insufficient extension space in the straight seam steel pipe during subsequent coiling.

[0098] Furthermore, in step S410, the plastic protective outer layer raw material is extruded to the outside of the anti-corrosion layer 23 by a plastic outer extruder 135 with a plastic outer mold 134, so that a plastic protective outer layer 25 is formed on the outside of the anti-corrosion layer 23, and a second composite pipe semi-finished product 32 is obtained. This plastic protective outer layer 25 has the advantages of the toughness and scratch resistance of the plastic material (such as HDPE) itself, and can also prevent most of the corrosion in the application environment.

[0099] The composite pipe 30 of this invention may be subject to corrosion from various complex materials when applied in harsh environments such as oil fields and oceans. Because the plastic material of the outer protective layer 25 has a polymer structure, there are gaps between the macromolecules at the microscopic level, allowing small molecule gases to permeate. Therefore, corrosion protection solely through the outer plastic protective layer 25 is insufficient. Currently, industries such as petrochemicals, docks, ships, and storage tanks use heavy-duty anti-corrosion paints with stable process performance to protect steel pipes from corrosion. Therefore, in step S310, the anti-corrosion effect of the composite pipe 30 is improved by coating and / or wrapping an anti-corrosion layer 23 around the outside of the corrugated metal protective layer 22. The anti-corrosion layer is at least one of an asphalt coating anti-corrosion layer, an asphalt cloth wrapping anti-corrosion layer, or a heavy-duty anti-corrosion paint anti-corrosion layer.

[0100] Example 2

[0101] like Figures 7 to 14 As shown, in one embodiment of the present invention, the method for manufacturing composite pipes includes the following steps:

[0102] S110, The plastic inner layer raw material is extruded by the plastic inner layer extruder 101 with the plastic inner layer mold 102 and transported to the first vacuum cooling device 210 for cooling and shaping to obtain the plastic inner layer tube 11.

[0103] S120, The plastic inner tube 11 is pulled out of the first vacuum cooling device 210 by the first traction machine 105;

[0104] S130, The reinforcing layer 12 is wound around the outside of the plastic inner tube 11 by the winding machine unit 220, and the first core tube semi-finished product 13 is obtained;

[0105] S131. The first core tube semi-finished product 13 is heated by the first oven 109;

[0106] S132, The heated first core tube semi-finished product 13 is cooled by the first air ring 110;

[0107] S133. An adhesive is extruded to the outside of the reinforcing layer 12 by an adhesive extruder with an adhesive extrusion die, and / or a finishing material is extruded to the outside of the reinforcing layer 12 by a finishing extruder 112 with a finishing die 111.

[0108] S134, The first core tube semi-finished product 13 is cooled by the second air ring 113;

[0109] S140. The plastic outer layer raw material is extruded to the outside of the first core tube semi-finished product 13 by the plastic outer layer extruder 115 with the plastic outer layer mold 114 to obtain the second core tube semi-finished product 15.

[0110] S141, the second core tube semi-finished product 15 is cooled by the third air ring 116.

[0111] S150, The second core tube semi-finished product 15 is transported to the second vacuum cooling device 230 for cooling and shaping to obtain the core tube 10;

[0112] S160, the core tube 10 is pulled out of the second vacuum cooling device 230 by the second traction machine 119.

[0113] S170, A sliding layer 16 is sleeved on the outside of the core tube 10 by a sliding material setting unit (not shown).

[0114] S201, The steel strip material 20 is released by the steel strip unwinder 120;

[0115] S2011, The steel strip material 20 is cut by the shearing machine 121 in a direction perpendicular to the length of the steel strip material 20;

[0116] S2012, The steel strip material 20 is welded in the width direction of the steel strip material 20 by the cross welding station 122;

[0117] S2013, The first delivery machine 123 transports the sheared steel strip material 20 into the storage frame 124;

[0118] S2014, The second delivery machine 125 transports the steel strip material 20 in the storage frame 124 to the tension detection device 126;

[0119] S202, The steel strip 40 is obtained by cutting off both sides of the steel strip 20 in a direction perpendicular to the width of the steel strip 20 by the edge cutting machine 127.

[0120] S210, A steel strip 40 is wrapped around the outside of the core tube 10 by a steel strip cold bending forming unit 128, and the longitudinal joint of the steel strip 40 is welded by a longitudinal welding device 129 to obtain the first composite pipe semi-finished product 31.

[0121] S211, The first composite pipe semi-finished product 31 is pulled out by the steel strip cold bending forming unit 128 by the third traction machine 130;

[0122] S220, the steel strip 40 is formed into the metal corrugated protective layer 22 by the corrugating machine 131.

[0123] S310, the anti-corrosion coating and drying unit 132 coats and / or wraps the anti-corrosion layer 23 on the outside of the metal corrugated protective layer 22, and the wrapping machine 133 wraps the polyester film 24 on the outside of the anti-corrosion layer 23.

[0124] S410. The plastic protective outer layer raw material is extruded to the outside of the anti-corrosion layer 23 by a plastic outer mold 135 with a plastic outer mold 134 to obtain the second composite pipe semi-finished product 32.

[0125] S411, The second composite pipe semi-finished product 32 is cooled by the fourth air ring 136;

[0126] S420, The second composite pipe semi-finished product 32 is transported to the third vacuum cooling device 240 for thorough cooling and shaping to obtain the composite pipe 30;

[0127] S430, The composite pipe 30 is pulled out of the third vacuum cooling device 240 by the fourth traction machine 139;

[0128] S510, The composite pipe 30 is cut by the pipe cutting machine 140;

[0129] S520, the cut composite pipe 30 is wound up to the work station by the winding machine 141.

[0130] In step S130, the winding machine unit 220 may include multiple winding machines 106. A second oven 107 and a fourth air ring 108, arranged sequentially along the pipe outlet direction A, are positioned between adjacent winding machines 106. The number of winding machines 106 can be increased or decreased depending on the pipe pressure and the number of reinforcing layers 12. The winding machines 106 are typically arranged in clockwise and counterclockwise groups to effectively prevent rotation of the plastic inner tube 11. Furthermore, each winding machine 106 is used to wind one layer of reinforcing material. The surface of the reinforcing material is typically coated with an adhesive. Heating the reinforcing material in the second oven 107 melts the adhesive, thus providing adhesion and resulting in a stronger surface bond between the reinforcing layer and the plastic inner tube 11, and between adjacent reinforcing layers. After cooling by the fourth air ring 108, the process proceeds to the next step. However, if the reinforcing material being wound is a pure metal material, such as steel or aluminum strip, heating in the second oven 107 is unnecessary.

[0131] Furthermore, because the outer plastic layer 14 of the core tube 10 is relatively thin, the texture of the reinforcing layer 12 is visible. In one embodiment, to improve the appearance of the core tube 10, in step S133, a finishing extruder 112 with a finishing die 111 extrudes a finishing material onto the outside of the reinforcing layer 12. This finishing material can be the same material as the outer plastic layer 14, or a material homologous to the outer plastic layer 14. By extruding a thin layer of finishing material onto the outside of the reinforcing layer 12 through the finishing extruder 112, and cooling it after being cooled by the second air ring 113, the depressions on the surface of the reinforcing layer 12 can be filled. In addition, when the outer plastic layer 14 is laminated onto the reinforcing layer 12, because the raw material of the outer plastic layer 14 is a molten substance, even if the thickness of the outer plastic layer 14 is increased, the depressions on the surface of the reinforcing layer 12 cannot be filled unless the thickness of the outer plastic layer 14 is increased to a very thick level, which increases the manufacturing cost of the core tube 10.

[0132] Furthermore, in step S133, the adhesive is extruded to the outside of the reinforcing layer 12 by an adhesive extruder with an adhesive extrusion die, which can increase the composite strength between the reinforcing layer 12 and the plastic outer layer 14.

[0133] In step S140, the plastic outer layer extruder 115 can draw a vacuum between the reinforcing layer 12 and the plastic outer layer preform through the plastic outer layer mold 114, so that the plastic outer layer 16 can cover the outer surface of the reinforcing layer 12.

[0134] In step S141, cooling the second core tube semi-finished product 15 by the third air ring 116 can prevent the second core tube semi-finished product 15 from being rapidly cooled by cold water in the second vacuum cooling device 230, which would cause defects such as pitting or orange peel texture on the outer surface, and further improve the appearance of the core tube 10.

[0135] In steps S201 to S202, when the remaining amount of steel strip material 20 on the steel strip unwinding machine 120 is small, the steel strip material 20 can be cut by the shearing machine 121 in a direction perpendicular to the length of the steel strip material 20, forming a first steel strip material and a second steel strip material. The tail of the first steel strip material is welded to the head of the next coil of steel strip material 20 on the strip welding station 122. The first delivery machine 123 quickly conveys the second steel strip material into the storage frame 124, wherein the storage frame 124 provides buffer and temporary storage space for the second steel strip material. Furthermore, the release speed of the steel strip material 20 can be approximately the same as the conveying speed of the core tube 10.

[0136] Furthermore, since the steel strip material 20 usually has defects such as irregularity or oxidized edges on both sides of its width, in step S202, in order to facilitate the welding of the steel strip 40 in step S210, the edge trimming machine 127 cuts off the defects such as irregularity or oxidized edges on both sides of the steel strip material 20 in a direction perpendicular to the width of the steel strip material 20 and obtains the steel strip 40.

[0137] Furthermore, to facilitate the subsequent composite plastic protective outer layer 25, in step S310, a polyester film 24 can be wrapped around the outside of the anti-corrosion layer 23 by a wrapping machine 133, without waiting for the anti-corrosion layer 23 to be completely dry. Even further, since the composite pipe 30 is approximately 125m long, to reduce the winding torque of the winding machine 141, a fourth traction machine 139 can be added in step S430.

[0138] Since the winding capacity of a single coil winder 141 is limited, in order to enable continuous production of composite pipe 30, a pipe cutter 140 can be added before the winder 141 to cut the composite pipe 30 after the single coil winder 141 is full. It is understood that it is preferable to configure two winders 141 to continuously wind the composite pipe 30.

[0139] A second aspect of the present invention provides a composite pipe production apparatus, the composite pipe production apparatus being configured to perform the above-described composite pipe manufacturing method. In one embodiment, the composite pipe production apparatus includes a core pipe conveying channel.

[0140] A third aspect of the present invention provides a composite pipe production equipment, the composite pipe production equipment being configured to perform the above-described composite pipe manufacturing method, the composite pipe production equipment including a core pipe conveying channel formed by a plurality of pipe overhead frames 201, the pipe overhead frames 201 being used to support the core pipe 10, and a second traction machine 119 conveying the core pipe 10 to the core pipe conveying channel such that the height of the core pipe 10 is higher than any one of the steel strip uncoiling machine 120, the edge trimming machine 127, the shearing machine 121, the strip welding station 122, the first delivery machine 123, the strip storage frame 124, the second delivery machine 125, and the tension detection device 126.

[0141] In this invention, by setting up a core tube conveying channel composed of multiple tube overhead frames 201, the core tube 10 can pass over any one of the following in height: steel strip uncoiling machine 120, edge trimming machine 127, shearing machine 121, strip welding station 122, first delivery machine 123, strip storage frame 124, second delivery machine 125, and tension detection device 126, thereby saving the floor space of the composite pipe production equipment. It is understood that, in one embodiment, the core tube conveying channel may include multiple tube overhead frames 201 located at different heights.

[0142] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A method of manufacturing a composite pipe, characterized by, The method includes the following steps: S100, Core tube (10) is manufactured by the core tube production line. S200, A metal corrugated protective layer (22) is wrapped around the outside of the core tube (10); S300, apply and / or wrap an anti-corrosion layer (23) around the outside of the corrugated metal protective layer (22); S400, A plastic outer protective layer (25) is wrapped around the outside of the anti-corrosion layer (23) to obtain a composite pipe (30); Step S200 includes the following sub-steps: S201, The steel strip material (20) is released by the steel strip unwinder (120); S2011, The steel strip material (20) is cut by a shearing machine (121) in a direction perpendicular to the length of the steel strip material (20). S2012, The steel strip material (20) is welded in the width direction of the steel strip material (20) by the cross welding station (122); S2013, The first delivery machine (123) transports the sheared steel strip material (20) into the storage frame (124); S2014. The steel strip material (20) in the storage frame (124) is transported to the tension detection device (126) by the second delivery machine (125). S202, The steel strip (40) is obtained by cutting off both sides of the steel strip material (20) in a direction perpendicular to the width of the steel strip material (20) using a cutting machine (127). S210. A steel strip (40) is wrapped around the outside of the core tube (10) by a steel strip cold bending forming unit (128). After the core tube (10) is wrapped by the steel strip (40) rolled into a tubular shape, the longitudinal joint of the steel strip (40) is welded by a longitudinal welding device (129) to obtain the first composite pipe semi-finished product (31). S220, The steel strip (40) is corrugated on the outside by the corrugating machine (131) so that the steel strip (40) is formed into the metal corrugated protective layer (22), the inner diameter of the corrugated protective layer (22) at the trough is slightly smaller than the outer diameter of the core tube (10).

2. The method for manufacturing composite pipes according to claim 1, characterized in that, Step S100 includes the following sub-steps: S110, The plastic inner layer raw material is extruded by the plastic inner layer extruder (101) with the plastic inner layer mold (102) and conveyed to the first vacuum cooling device (210) for cooling and shaping to obtain the plastic inner layer tube (11). S120, The plastic inner tube (11) is pulled out from the first vacuum cooling device (210) by the first traction machine (105); S130, The reinforcing layer (12) is wound on the outside of the plastic inner tube (11) by the winding machine unit (220) to obtain the first core tube semi-finished product (13). S140. The plastic outer layer raw material is extruded to the outside of the first core tube semi-finished product (13) by a plastic outer layer extruder (115) with a plastic outer layer mold (114) to obtain the second core tube semi-finished product (15). S150. The second core tube semi-finished product (15) is transported to the second vacuum cooling device (230) for cooling and shaping to obtain the core tube (10). S160, the core tube (10) is pulled out of the second vacuum cooling device (230) by the second traction machine (119).

3. The method for manufacturing composite pipes according to claim 2, characterized in that, Step S100 also includes the following sub-steps performed after sub-step S130 and before sub-step S140: S131. The first core tube semi-finished product (13) is heated by the first oven (109); S132, The heated first core tube semi-finished product (13) is cooled by the first air ring (110); S133, the adhesive is extruded to the outside of the reinforcing layer (12) by an adhesive extruder with an adhesive extrusion die, and / or the finishing material is extruded to the outside of the reinforcing layer (12) by a finishing extruder (112) with a finishing die (111). S134, the first core tube semi-finished product (13) is cooled by the second air ring (113).

4. The method for manufacturing composite pipes according to claim 2, characterized in that, Step S100 also includes the following sub-steps performed after sub-step S140 and before sub-step S150: S141, the second core tube semi-finished product (15) is cooled by the third air ring (116).

5. The method for manufacturing composite pipes according to claim 2, characterized in that, The first vacuum cooling device (210) includes a first vacuum spray cooling water tank (103) and a second vacuum spray cooling water tank (104) arranged sequentially along the pipe outlet direction (A). The second vacuum cooling device (230) includes a third vacuum spray cooling water tank (117) and a fourth vacuum spray cooling water tank (118) arranged sequentially along the pipe outlet direction (A) of the pipe. The winding machine unit (220) includes multiple winding machines (106), and a second drying oven (107) and a fourth air ring (108) are arranged sequentially between two adjacent winding machines (106) along the pipe outlet direction (A).

6. The method for manufacturing composite pipes according to claim 1, characterized in that, The method further includes the following sub-steps performed after step S100 and between step S200: S170, A sliding layer (16) is fitted on the outside of the core tube (10) by a sliding material setting unit.

7. The method for manufacturing composite pipes according to claim 1, characterized in that, Step S200 also includes the following steps performed after sub-step S210 and before sub-step S220: S211, The first composite pipe semi-finished product (31) is pulled out by the third traction machine (130) from the steel strip cold bending forming unit (128).

8. The method for manufacturing composite pipes according to claim 1, characterized in that, Step S300 includes the following sub-steps: S310, The anti-corrosion coating and / or wrapping of the anti-corrosion coating (23) is applied to the outside of the metal corrugated protective layer (22) by the anti-corrosion coating and drying unit (132).

9. The method for manufacturing composite pipes according to claim 8, characterized in that, Sub-step S310 further includes: wrapping a polyester film (24) around the outside of the anti-corrosion layer (23) by a wrapping machine (133).

10. The method for manufacturing composite pipes according to claim 1, characterized in that, The anti-corrosion layer is at least one of the following: asphalt coating anti-corrosion layer, asphalt cloth wrapping anti-corrosion layer, or heavy-duty anti-corrosion paint anti-corrosion layer.

11. The method for manufacturing composite pipes according to claim 1, characterized in that, Step S400 includes the following sub-steps: S410. The plastic protective outer layer raw material is extruded to the outside of the anti-corrosion layer (23) by a plastic outer extruder (135) with a plastic outer mold (134) to obtain a second composite pipe semi-finished product (32). S420, the second composite pipe semi-finished product (32) is transported to the third vacuum cooling device (240) for cooling and shaping to obtain the composite pipe (30).

12. The method for manufacturing composite pipes according to claim 11, characterized in that, Step S400 also includes the following sub-steps performed after sub-step S410 and before sub-step S420: S411, the second composite pipe semi-finished product (33) is cooled by the fourth air ring (136).

13. The method for manufacturing composite pipes according to claim 11, characterized in that, Step S400 also includes the following sub-steps performed after sub-step S420: S430, the composite pipe (30) is pulled out from the third vacuum cooling device (240) by the fourth traction machine (139).

14. The method for manufacturing composite pipes according to claim 11, characterized in that, The third vacuum cooling device (240) includes a fifth vacuum spray cooling water tank (137) and a sixth vacuum spray cooling water tank (138) arranged sequentially along the pipe outlet direction (A).

15. The method for manufacturing composite pipes according to claim 1, characterized in that, The method also includes the following steps after step S400: S500, the composite pipe (30) is wound up to the work station.

16. The method for manufacturing composite pipes according to claim 15, characterized in that, Step S500 also includes the following sub-steps: S510, The composite pipe (30) is cut by the pipe cutting machine (140); S520, The cut composite pipe (30) is wound up to the work station by the winding machine (141).

17. A composite pipe production equipment, characterized in that, The composite pipe production equipment is configured to perform the composite pipe manufacturing method according to any one of claims 1-16.

18. The composite pipe production equipment according to claim 17, characterized in that, The composite pipe production equipment includes a core pipe conveying channel.

19. The composite pipe production equipment according to claim 17, characterized in that, The composite pipe production equipment includes a core pipe conveying channel formed by multiple pipe overhead frames (201), the pipe overhead frames (201) being used to support the core pipe (10) so that the height of the core pipe (10) is higher than any one of the steel strip uncoiling machine (120), the edge trimming machine (127), the shearing machine (121), the strip welding station (122), the first delivery machine (123), the strip storage frame (124), the second delivery machine (125), and the tension detection device (126).

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