A high-strength double-wave pipeline and its preparation method

Abstract

The present invention provides a high-strength double-wave pipeline and a preparation method thereof, which can prepare a high-strength double-wave pipeline with high ring stiffness, strong corrosion resistance and a more reasonable load-bearing structure. It includes an inner-layer polyethylene, an outer-layer polyethylene, a perforated steel strip, an adhesive resin, an anti-corrosion layer, a reinforcing strip and a heat-shrinkable strip. The perforated steel strip is arranged above the inner-layer polyethylene, and the cross-section of the perforated steel strip has a double-wave peak in an M shape. The outer-layer polyethylene is closely arranged above the perforated steel strip, and an adhesive resin is arranged inside the outer-layer polyethylene. There is a gap between each double-wave peak, and an anti-corrosion layer, a reinforcing strip and a heat-shrinkable strip are also arranged between the gaps. The anti-corrosion layer is closely arranged against the outer-layer polyethylene, the reinforcing strip and the heat-shrinkable strip are arranged outside the anti-corrosion layer, and the heat-shrinkable strip is arranged above the reinforcing strip.

Description

Technical Field

[0001] The present invention relates to the field of corrugated pipes, and more particularly, to a high-strength double-wave pipe and a preparation method thereof. Background Art

[0002] The composite layers of the steel belt corrugated pipe are formed in a molten plastic state, which is completely different from the secondary melting and forming of the wound pipe (hollow wall pipe). Therefore, the layers are completely bonded to each other with very high fastness. By performing special pretreatment on the surface of the steel belt, the corrosion resistance of the steel and the adhesion between the steel and the plastic are enhanced, and the peel strength is improved. The pipe is wound and formed in a state where the plastic raw material is fully melted, and the overall structure of the pipe is firm and reliable. Since special materials and processes are used, both the corrosion problem of the steel plate and the adhesion between the steel plate and the PE material are solved, so that the service life of the pipe is the same as that of the pure plastic pipe, ensuring more than 50 years. In the prior art, electrofusion connection, heat shrinkable tape connection, internal and external extrusion welding or a combination of multiple connections can be used. The connection is firm, and a reliable connection can make the pipe achieve zero leakage. However, the corrugated pipes in the prior art are often of a single-wave structure, and their ring stiffness and corrosion resistance are not ideal, and they are easily damaged. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-strength double-wave pipe and a preparation method thereof, which can prepare a high-strength double-wave pipe with high ring stiffness, strong corrosion resistance and a more reasonable load-bearing structure.

[0004] The embodiments of the present invention are implemented as follows:

[0005] A high-strength double-wave pipe includes an inner layer of polyethylene, an outer layer of polyethylene, a perforated steel belt, an adhesive resin, an anti-corrosion layer, a reinforcing belt and a heat shrinkable tape. The perforated steel belt is arranged above the inner layer of polyethylene. The cross-section of the perforated steel belt has a double-wave peak in the shape of an M. The outer layer of polyethylene is attached to the upper part of the perforated steel belt. An adhesive resin is arranged inside the outer layer of polyethylene. A gap is arranged between each double-wave peak, and an anti-corrosion layer, a reinforcing belt and a heat shrinkable tape are also arranged between the gaps. The anti-corrosion layer is closely attached to the outer layer of polyethylene. The reinforcing belt and the heat shrinkable tape are arranged outside the anti-corrosion layer, and the heat shrinkable tape is arranged above the reinforcing belt.

[0006] In a preferred embodiment of the present invention, the thickness of the anti-corrosion layer is equal to the thickness of the outer layer of polyethylene.

[0007] In a preferred embodiment of the present invention, the total thickness of the reinforcing belt and the heat shrinkable tape is equal to the thickness of the anti-corrosion layer.

[0008] In a preferred embodiment of the present invention, the minimum wall thickness of the outer layer of polyethylene is 5-11 mm.

[0009] In a preferred embodiment of the present invention, the minimum wall thickness of the inner layer of polyethylene is 2.5-6 mm.

[0010] In a preferred embodiment of the present invention, a method for preparing a high-strength double-wave pipeline is further provided, including the following steps:

[0011] (1) Preparation of the galvanized steel strip layer: Start the pipeline forming device and the bending device. The pipeline forming device and the bending device run at a speed ratio of 1:1.4 respectively. The galvanized steel strip layer is initially formed after passing through the vertical rollers and the forming concave and convex rollers in sequence. The first bending group rollers of the bending device form the steel strip into a steel strip loop. Adjust the second bending group rollers of the bending device to smooth and flatten the surface of the steel strip loop; then adjust the third bending group rollers to roll the steel strip loop into a circle with the same diameter as the target steel strip loop; the diameter of the steel strip loop = the target steel strip loop diameter + 30 - 50 mm; Transfer the adjusted circular steel strip loop to the feeding device, start the feeding motor, and adjust the relative position of the spacer sleeve on the feeding device to ensure that the formed steel strip loop runs smoothly on the feeding device;

[0012] (2) Preparation before rolling: The feeding device feeds the end of the circular steel strip loop between the upper polytetrafluoroethylene pressing wheel and the lower polytetrafluoroethylene pressing wheel. The upper polytetrafluoroethylene pressing wheel presses down. At this time, adjust the guiding device of the roller, and then release the upper and lower polytetrafluoroethylene pressing wheels; Adjust the inclination angle of the four-roller winding to make the upper polytetrafluoroethylene pressing wheel, the lower polytetrafluoroethylene pressing wheel and the center line of the roller consistent;

[0013] (3) Formal preparation work: Open the oven, preheat the steel strip to 100 °C, extrude the outer sheet and the inner sheet of the corrugated pipe, and start the hot air device at the same time. Adjust the rotation speed to the process value, and then press the upper polytetrafluoroethylene pressing wheel and the lower polytetrafluoroethylene pressing wheel; Start the forming motor, the bending motor and the feeding motor and run according to the corresponding ratio; Feed the steel strip into the upper polytetrafluoroethylene pressing wheel, move the steel strip synchronously with the inner sheet and the outer sheet, and then import them into the lower polytetrafluoroethylene pressing wheel together; Open the outer sheet blowing device and adjust the edge pressing wheel,

[0014] Ensure that the shapes of the outer sheet and the steel strip are the same;

[0015] (4) When the steel strip, the inner sheet and the outer sheet run to the pipe rack, open the inner water spraying device to spray water on the inner wall of the pipeline. Adjust the left and right positions and the height of the pipe rack according to the natural inclination angle position of the pipe material to meet the requirements of the outer diameter size of different specifications of pipe materials;

[0016] (5) Cut the end face of the pipe material before starting the machine, measure the inner and outer dimensions of the pipe material, and adjust the operating parameters of the inner sheet extruder and the outer sheet extruder according to the specified standard of the pipe material and the actual size of the pipe material to obtain qualified pipe materials; Detect the bonding situation of the inner and outer sheets of the pipe material, and make appropriate adjustments to the oven and the external heating device of the steel strip to ensure reliable bonding of the pipe material steel strip, the inner and outer sheets.

[0017] The beneficial effects of the embodiments of the present invention are as follows: In the high-strength double-wave pipeline of the present invention, the corrugated layer is provided with inner-layer polyethylene, outer-layer polyethylene, perforated steel strip, adhesive resin, anti-corrosion layer, reinforcing strip and heat-shrinkable strip. The cooperation among the various material layers makes the corrugated pipeline have higher ring stiffness and stronger corrosion resistance. At the same time, the corrugated layer is set in the shape of an M-shaped double-wave crest, so that the corrugated pipeline has better load-bearing performance and can be buried underground for long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0020] Reference numerals: 001 - inner-layer polyethylene; 002 - outer-layer polyethylene; 003 - perforated steel strip; 004 - adhesive resin; 005 - anti-corrosion layer; 006 - reinforcing strip; 007 - heat-shrinkable strip. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0025] In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the component is required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0026] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] First Embodiment

[0028] Please refer to Figure 1 , this embodiment provides a high-strength double-wave pipe, which includes an inner-layer polyethylene 001, an outer-layer polyethylene 002, a perforated mesh steel strip 003, an adhesive resin 004, an anti-corrosion layer 005, a reinforcing strip 006, and a heat-shrinkable tape 007. The perforated mesh steel strip 003 is disposed above the inner-layer polyethylene 001. The cross-section of the perforated mesh steel strip 003 has a double-wave peak in an M shape. The outer-layer polyethylene 002 is closely attached and disposed above the perforated mesh steel strip 003. The adhesive resin 004 is disposed inside the outer-layer polyethylene 002. There is a gap between each double-wave peak, and an anti-corrosion layer 005, a reinforcing strip 006, and a heat-shrinkable tape 007 are also disposed between the gaps. The anti-corrosion layer 005 is closely attached to the outer-layer polyethylene 002. The reinforcing strip 006 and the heat-shrinkable tape 007 are disposed outside the anti-corrosion layer 005, and the heat-shrinkable tape 007 is disposed above the reinforcing strip 006.

[0029] More specifically, in this embodiment, the thickness of the anti-corrosion layer 005 is equal to the thickness of the outer polyethylene layer 002. The total thickness of the reinforcing strip 006 and the heat-shrinkable strip 007 is equal to the thickness of the anti-corrosion layer 005. The minimum wall thickness of the outer polyethylene layer 002 is 5 - 11 mm. The minimum wall thickness of the inner polyethylene layer 001 is 2.5 - 6 mm. The height of the double-wave crest is 10 - 22 mm, and the thickness of the anti-corrosion layer is: 2.2 mm - 3.5 mm.

[0030] This embodiment also provides a method for manufacturing a high-strength double-wave pipeline, including the following steps:

[0031] (1) Preparation of the galvanized steel strip layer: Start the pipe forming device and the bending device. The pipe forming device and the bending device operate at a speed ratio of 1:1.4 respectively. The galvanized steel strip layer is initially formed after passing through the vertical rollers and the forming concave and convex rollers in sequence. The first bending group rollers of the bending device form the steel strip into a steel strip loop. The bending device adjusts the second bending group rollers to polish the surface of the steel strip loop smooth and flat; then adjusts the third bending group rollers to roll the steel strip loop into a circle with the same diameter as the target steel strip loop; the diameter of the steel strip loop = the target steel strip loop diameter + 30 - 50 mm; transfer the adjusted circular steel strip loop to the feeding device, start the feeding motor, and adjust the relative position of the spacer sleeves on the feeding device to ensure that the formed steel strip loop runs smoothly on the feeding device;

[0032] (2) Preparation before rolling: The feeding device feeds the end of the circular steel strip loop between the upper polytetrafluoroethylene pressing wheel and the lower polytetrafluoroethylene pressing wheel. The upper polytetrafluoroethylene pressing wheel presses down. At this time, adjust the guiding device of the rollers, and then release the upper and lower polytetrafluoroethylene pressing wheels; adjust the inclination angle of the four-roll winding to make the upper polytetrafluoroethylene pressing wheel, the lower polytetrafluoroethylene pressing wheel, and the center line of the roller consistent;

[0033] (3) Formal manufacturing work: Open the oven, preheat the steel strip to 100 °C, extrude the outer and inner sheets of the corrugated pipe, and at the same time start the hot air device, adjust the rotation speed to the process value, and then press the upper polytetrafluoroethylene pressing wheel and the lower polytetrafluoroethylene pressing wheel; start the forming motor, the bending motor, and the feeding motor, and operate according to the corresponding ratio; feed the steel strip into the upper polytetrafluoroethylene pressing wheel, move the steel strip synchronously with the inner and outer sheets, and then import them into the lower polytetrafluoroethylene pressing wheel together; open the outer sheet blowing device and adjust the edge pressing wheel to ensure that the shape of the outer sheet is the same as that of the steel strip;

[0034] (4) When the steel strip, the inner sheet, and the outer sheet run to the pipe rack, open the inner water spraying device to spray water on the inner wall of the pipeline, and adjust the left and right positions and the height of the pipe rack according to the natural inclination angle position of the pipe material to meet the requirements of the outer diameter size of different specifications of pipe materials;

[0035] Before starting the machine, cut off the end face of the pipe, measure the inner and outer dimensions of the pipe, and adjust the operating parameters of the inner sheet extruder and the outer sheet extruder according to the specified standards of the pipe and the actual size of the pipe to obtain qualified pipes; detect the bonding of the inner and outer sheets of the pipe, and make appropriate adjustments to the oven and the steel belt external heating device to ensure reliable bonding of the pipe steel belt, inner and outer sheets.

[0036] In summary, for the high-strength double-wave pipe in this embodiment, the corrugated layer is provided with inner-layer polyethylene, outer-layer polyethylene, perforated steel belt, bonding resin, anti-corrosion layer, reinforcing belt and heat-shrinkable belt. The cooperation between the various material layers makes the corrugated pipe have higher ring stiffness and stronger corrosion resistance. At the same time, the corrugated layer is set in the shape of an M-shaped double-wave peak, which makes the load-bearing performance of the corrugated pipe better and can be buried underground for long-term use.

[0037] This specification describes examples of embodiments of the present invention and does not mean that these embodiments illustrate and describe all possible forms of the present invention. It should be understood that the embodiments in the specification can be implemented in various alternative forms. The drawings do not need to be drawn to scale; some features can be enlarged or reduced to show details of specific components. The specific structural and functional details disclosed should not be construed as limiting, but are merely a representative basis for teaching those skilled in the art to implement the present invention in multiple forms. Those skilled in the art should understand that the multiple features described and illustrated with reference to any one of the drawings can be combined with the features illustrated in one or more other drawings to form embodiments not explicitly illustrated or described. The described combined features provide representative embodiments for typical applications. However, various combinations and variations of features consistent with the teachings of the present invention can be used for specific applications or implementations as needed.

[0038] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-strength double-wave pipeline, characterized in that, It includes an inner polyethylene layer, an outer polyethylene layer, a perforated mesh steel strip, an adhesive resin, an anti-corrosion layer, a reinforcing strip and a heat-shrinkable strip. The perforated mesh steel strip is arranged above the inner polyethylene layer. The cross-section of the perforated mesh steel strip has a double-wave peak in the shape of an M. The outer polyethylene layer is attached and arranged above the perforated mesh steel strip. The adhesive resin is arranged inside the outer polyethylene layer. A gap is arranged between each double-wave peak. The anti-corrosion layer, the reinforcing strip and the heat-shrinkable strip are also arranged between the gaps. The anti-corrosion layer is closely attached to the outer polyethylene layer. The reinforcing strip and the heat-shrinkable strip are arranged outside the anti-corrosion layer. The heat-shrinkable strip is arranged above the reinforcing strip; The preparation method of the high-strength double-wave pipeline includes the following steps: (1) Preparation of the galvanized steel strip layer: Start the pipeline forming device and the bending device. The pipeline forming device and the bending device operate at a speed ratio of 1:1.4 respectively. The galvanized steel strip layer is initially formed after passing through the vertical rollers and the forming concave and convex rollers in sequence. The first bending group rollers of the bending device form a steel strip coil from the galvanized steel strip layer. The bending device adjusts the second bending group rollers to polish the surface of the steel strip coil smooth and flat. Then adjust the third bending group rollers to roll the steel strip coil into a circle with the same diameter as the target steel strip coil. The diameter of the steel strip coil = the diameter of the target steel strip coil + 30 - 50 mm. Transmit the adjusted circular steel strip coil to the feeding device. Start the feeding motor and adjust the relative positions of the spacers on the feeding device to ensure that the formed steel strip coil runs smoothly on the feeding device; (2) Preparation before rolling: The feeding device sends the end of the circular steel strip coil between the upper polytetrafluoroethylene pressing wheel and the lower polytetrafluoroethylene pressing wheel. The upper polytetrafluoroethylene pressing wheel presses down. At this time, adjust the guiding device of the roller, and then loosen the upper and lower polytetrafluoroethylene pressing wheels. Adjust the inclination angle of the four-roller winding to make the upper polytetrafluoroethylene pressing wheel, the lower polytetrafluoroethylene pressing wheel and the center line of the roller consistent; (3) Formal preparation work: Open the oven and preheat the steel strip to 100 °C. Extrude the outer sheet and the inner sheet of the corrugated pipe. At the same time, start the hot air device and adjust the rotation speed to the process value, and then press the upper polytetrafluoroethylene pressing wheel and the lower polytetrafluoroethylene pressing wheel; Start the forming motor, the bending motor and the feeding motor and operate according to the corresponding ratio. Send the steel strip into the upper polytetrafluoroethylene pressing wheel, move the steel strip synchronously with the inner sheet and the outer sheet, and then import them into the lower polytetrafluoroethylene pressing wheel together; Open the outer sheet blowing device and adjust the edge pressing wheel to ensure that the shape of the outer sheet is the same as that of the steel strip; (4) When the steel strip, the inner sheet and the outer sheet run to the pipe rack, open the inner water spraying device and spray water on the inner wall of the pipeline. Adjust the left and right positions and the height of the pipe rack according to the natural inclination angle position of the pipe material to meet the requirements of the outer diameter size of different specifications of pipe materials; (5) Cut the end face of the pipe material before starting the machine, measure the inner and outer dimensions of the pipe material, and adjust the operating parameters of the inner sheet extruder and the outer sheet extruder according to the specified standard of the pipe material and the actual size of the pipe material to obtain qualified pipe materials. Detect the bonding situation of the inner and outer sheets of the pipe material, and make appropriate adjustments to the oven and the external heating device of the steel strip to ensure reliable bonding of the pipe material steel strip, the inner and outer sheets.

2. The high-strength double-wave pipeline according to claim 1, wherein The thickness of the anti-corrosion layer is equal to the thickness of the outer polyethylene layer.

3. The high-strength double-wave pipeline according to claim 1, characterized in that, The total thickness of the reinforcing tape and the heat-shrinkable tape is equal to the thickness of the anti-corrosion layer.

4. The high-strength double-wave pipeline according to claim 1, characterized in that, The minimum wall thickness of the outer polyethylene layer is 5 - 11 mm.

5. The high-strength double-wave pipeline according to claim 1, wherein The minimum wall thickness of the inner polyethylene layer is 2.5 - 6 mm.

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