阅读说明：本技术 一种多层强化疏浚管及其成型工艺 (Multilayer reinforced dredging pipe and forming process thereof ) 是由 刘桐宇 邹雪 刘伟华 李英民 张伟 张琨 于 2021-08-19 设计创作，主要内容包括：本发明涉及疏浚工程管道技术领域,尤其涉及一种多层强化疏浚管及其成型工艺,包括管体和位于管体两端的法兰,管体由内到外依次为耐磨高分子层、警示高分子层、第一复合强化层、钢线强化层、钢线填充层、第二复合强化层和外敷高分子层。成型步骤包括模具准备、各功能层敷设、硫化成型和脱模。与现有技术相比,本发明的有益效果在于：1)采用橡胶高分子材料与缠绕的钢丝增强层相结合,一方面对钢丝起到固定作用,另一方面还可避免管体变形后钢丝对管体本身的破坏作用；2)管体通过将多种不同力学结构的功能层牢固地连接成一体,可有效地避免管体在长期伸缩、弯曲、扭转作用下钢丝剥离,以解决疏浚管在恶劣环境下管体不断受到疲劳破坏的问题。(The invention relates to the technical field of dredging engineering pipelines, in particular to a multilayer reinforced dredging pipe and a forming process thereof. The forming step comprises the steps of preparing a mould, laying each functional layer, vulcanizing and forming and demoulding. Compared with the prior art, the invention has the beneficial effects that: 1) the rubber polymer material is combined with the wound steel wire reinforcing layer, so that the steel wire is fixed on one hand, and the damage of the steel wire to the pipe body after the pipe body is deformed can be avoided on the other hand; 2) the functional layers of various different mechanical structures are firmly connected into a whole, so that the steel wire of the pipe body can be effectively prevented from being peeled off under the long-term stretching, bending and twisting actions, and the problem that the pipe body of the dredging pipe is continuously subjected to fatigue damage under the severe environment is solved.)

1. The multi-layer reinforced dredging pipe comprises a pipe body and flanges positioned at two ends of the pipe body, and is characterized in that the pipe body sequentially comprises a wear-resistant macromolecule layer, a warning macromolecule layer, a first composite reinforcing layer, a steel wire filling layer, a second composite reinforcing layer and an external application macromolecule layer from inside to outside, wherein the thickness of the wear-resistant macromolecule layer is 30-70 mm, the thickness of the warning macromolecule layer is 3-15 mm, the thickness of the first composite reinforcing layer is 15-40 mm, the thickness of the steel wire reinforcing layer is 3-7 mm, the thickness of the steel wire filling layer is 5-10 mm, the thickness of the second composite reinforcing layer is 10-20 mm, the thickness of the external application macromolecule layer is 2-4 mm, the inner diameter of the pipe body is 500-1000 mm, and the length of the pipe body is 10000-13000 mm.

2. The multi-layer reinforced dredging pipe of claim 1, wherein the first and second composite reinforcing layers are each formed by winding a reinforcing rubber sheet mixed with one of nitrile rubber, styrene butadiene rubber or natural rubber and one or a combination of two or more of cord fabric, nylon mesh fabric, silk thread, nylon rope or polyester fiber, wherein the thickness of each reinforcing rubber sheet is 1-2.5 mm, each reinforcing rubber sheet is wound in a cross way, and the winding angle is 30-70 °.

3. The multilayer reinforced dredging pipe of claim 1, wherein the wear-resistant polymer layer is any one of nitrile rubber, styrene butadiene rubber, ethylene propylene diene monomer rubber or natural rubber.

4. The multi-layer enhanced dredging pipe of claim 1, wherein the warning polymer layer is composed of at least two colors of wear-resistant polymer layers.

5. The multi-layer reinforced dredging pipe of claim 1, wherein the steel wire reinforced layer is wound with any one of steel wires, steel wires or steel ropes as reinforcement members, the diameter of the reinforcement members is 1-9 mm, and the winding pitch is 1-7 mm.

6. A forming process of a multilayer reinforced dredging pipe is characterized by comprising main pipe mold preparation, functional layer laying, vulcanization forming and demolding, and specifically comprises the following steps:

1) preparing a main pipeline mould, and treating, positioning and matching flange barrels, wherein the preparation of the main pipeline mould comprises winding a PP film on the mould, and coating, brushing, painting or smearing demoulding silicone oil; the treatment process of the flange cylinder comprises sand blasting, coating, brushing, painting or glue smearing of the flange cylinder, and rubber is wound or adhered at the end part of the flange cylinder;

2) laying all functional layers, sequentially filling or winding a wear-resistant polymer layer and a warning polymer layer on a main pipeline mould between two flange cylinders, and pressurizing and shaping by using a pressurizing material in a winding or binding mode; filling or winding high polymer materials on the outer surface of the flange cylinder and two sides of the flange cylinder hoop, and pressurizing and shaping; winding or binding a first composite reinforcing layer on the outer surface of the main pipeline mould and the flange cylinder, and pressurizing and shaping; winding or binding a steel wire reinforcing layer on the pipeline main body from one end to the other end, and laying a steel wire filling layer on the outer surface of the steel wire reinforcing layer; winding or binding a second composite reinforcing layer on the outer surface of the main pipeline mould and the flange cylinder, and pressurizing and shaping; filling or winding the whole tube with a polymer layer, and pressurizing and shaping;

3) vulcanizing, namely treating the whole pipe by using a continuous vulcanization method until the pipe is molded, wherein the vulcanization temperature is 90-150 ℃, and the vulcanization time is 300-900 min;

4) and (4) demolding, namely taking the pipe body down from the main pipe mold, and repeatedly using the main pipe mold.

7. The process of claim 6, wherein the steel wires at the flange end and the second composite reinforcement layer are modified before the polymer layer is applied in step 2), and the excess portions are filled or removed to make the deviation of the perimeter dimension meet the design requirement.

8. The forming process of the multi-layer reinforced dredging pipe as claimed in claim 6, wherein the press-setting in step 2) is performed by winding or binding with any one of cord fabric, nylon thread or nylon rope, the winding tension is 5-50 MPa, the press-setting time is 5-60min, and then the pipe is dismantled.

9. The forming process of the multi-layer reinforced dredging pipe as claimed in claim 6, wherein the bonding strength between the polymer material in the steel wire reinforced layer and the flange cylinder after vulcanization in the step 3) is not lower than 3N/mm.

Technical Field

The invention relates to the technical field of dredging engineering pipelines, in particular to a multilayer reinforced dredging pipe and a forming process thereof.

Background

The dredging pipe processed and molded by utilizing the high polymer material has higher wear resistance, corrosion resistance and low flow resistance, can effectively reduce the influence caused by large conveying pressure and high flow velocity in the dredging process, and can simultaneously reduce the damage caused by a large amount of gravels, coral reefs, coarse sand, hard clay and the like contained in the dredging soil.

The utility model discloses a pipeline is dredged to ultra high molecular weight polyethylene diaphragm with application number 201220255889.4, including inner tube, winding steel wire, copolymer primer layer, protective layer and hoop, the inner tube is formed for the heat seal of 2-3 layers of ultra high molecular weight polyethylene diaphragm, and the tensile strength of diaphragm is greater than 200 MPa. The high-pressure-bearing energy-saving fluid conveying device is strong in pressure-bearing capacity, light in weight, convenient to transport and install, smooth in pipe wall, capable of reducing flow resistance and fluid conveying energy, energy-saving and environment-friendly.

The chinese patent with application number 201710986418.8 discloses a dredging pipe and a processing method thereof, the processing method of the dredging pipe comprises the following steps: s100, welding a steel wire mesh on the inner wall of the metal base pipe; s200, centrifugally spraying adhesive glue on the steel wire mesh, wherein the adhesive glue of the adhesive glue is completely contained and compounded on the steel wire mesh to form a steel wire mesh adhesive layer; s300, centrifugally spraying a high-molecular wear-resistant layer on the steel mesh glue layer; s400, curing the sprayed high-molecular wear-resistant layer at normal temperature to enable the high-molecular wear-resistant layer and the steel mesh glue layer to be cured on the metal base pipe together. The steel mesh glue layer includes wire net and adhesive, and the wire net passes through welding and metal base pipe connection, adds adhesive in the wire net simultaneously, and the mucilage glue contains completely compound in the wire net, and the steel mesh glue layer solidifies as an organic wholely with the polymer wearing layer in addition, realizes three layer construction's the formula of containing complex, makes polymer wearing layer and metal base pipe can firmly combine, can solve the problem of dredging the easy separation of intraductal polymer wearing layer and metal base pipe in the pipe, avoids dredging the pipe inefficacy and scrapping.

Because the working environment of the dredging pipe is very harsh, the pipe body is continuously stretched, bent and twisted under the action of severe hydraulic force such as continuous shaking, sinking and floating, collision and the like, and the steel wire mesh and the polymer layer in the prior art can not keep good bonding strength, and finally the steel wire mesh and the polymer layer are damaged by fatigue.

Disclosure of Invention

The invention aims to provide a multilayer reinforced dredging pipe and a forming process thereof, which overcome the defects of the prior art, adopt the combination of rubber high polymer materials and a steel wire reinforced layer of a winding structure, fill trapezoidal rubber in steel wire gaps to fix steel wires, firmly connect functional layers of various different mechanical structures into a whole by a pipe body, improve the integral deformation resistance, avoid the stripping phenomenon of the steel wires under the long-term stretching, bending and twisting actions of the pipe body, and prolong the service life of the pipe body.

In order to solve the problems, the invention adopts the following technical scheme:

the technical scheme is as follows: the multi-layer reinforced dredging pipe comprises a pipe body and flanges positioned at two ends of the pipe body, and is characterized in that the pipe body sequentially comprises a wear-resistant macromolecule layer, a warning macromolecule layer, a first composite reinforcing layer, a steel wire filling layer, a second composite reinforcing layer and an external application macromolecule layer from inside to outside, wherein the thickness of the wear-resistant macromolecule layer is 30-70 mm, the thickness of the warning macromolecule layer is 3-15 mm, the thickness of the first composite reinforcing layer is 15-40 mm, the thickness of the steel wire reinforcing layer is 3-7 mm, the thickness of the steel wire filling layer is 5-10 mm, the thickness of the second composite reinforcing layer is 10-20 mm, the thickness of the external application macromolecule layer is 2-4 mm, the inner diameter of the pipe body is 500-1000 mm, and the length of the pipe body is 10000-13000 mm.

The first composite reinforced layer and the second composite reinforced layer are respectively formed by winding a reinforced film which is prepared by mixing any one or more of cord fabric, nylon screen cloth, silk thread, nylon rope or polyester fiber with any one of nitrile rubber, styrene butadiene rubber or natural rubber, the thickness of each layer of reinforced film is 1-2.5 mm, each layer of reinforced film is wound in a cross way, and the winding angle is 30-70 degrees.

The wear-resistant polymer layer is any one of nitrile rubber, styrene butadiene rubber, ethylene propylene diene monomer or natural rubber.

The warning polymer layer is composed of wear-resistant polymer layers with at least two colors.

Any one of a steel wire, a steel wire or a steel rope is wound in the steel wire reinforcing layer to serve as a reinforcing body, the diameter of the reinforcing body is 1-9 mm, and the winding distance is 1-7 mm.

The second technical proposal is that: a forming process of a multilayer reinforced dredging pipe is characterized by comprising main pipe mold preparation, functional layer laying, vulcanization forming and demolding, and specifically comprises the following steps:

1) preparing a main pipeline mould, and treating, positioning and matching flange barrels, wherein the preparation of the main pipeline mould comprises winding a PP film on the mould, and coating, brushing, painting or smearing demoulding silicone oil; the treatment process of the flange cylinder comprises sand blasting, coating, brushing, painting or glue smearing of the flange cylinder, and rubber is wound or adhered at the end part of the flange cylinder;

2) laying all functional layers, sequentially filling or winding a wear-resistant polymer layer and a warning polymer layer on a main pipeline mould between two flange cylinders, and pressurizing and shaping by using a pressurizing material in a winding or binding mode; filling or winding high polymer materials on the outer surface of the flange cylinder and two sides of the flange cylinder hoop, and pressurizing and shaping; winding or binding a first composite reinforcing layer on the outer surface of the main pipeline mould and the flange cylinder, and pressurizing and shaping; winding or binding a steel wire reinforcing layer on the pipeline main body from one end to the other end, and laying a steel wire filling layer on the outer surface of the steel wire reinforcing layer; winding or binding a second composite reinforcing layer on the outer surface of the main pipeline mould and the flange cylinder, and pressurizing and shaping; filling or winding the whole tube with a polymer layer, and pressurizing and shaping;

3) vulcanizing, namely treating the whole pipe by using a continuous vulcanization method until the pipe is molded, wherein the vulcanization temperature is 90-150 ℃, and the vulcanization time is 300-900 min;

4) and (4) demolding, namely taking the pipe body down from the main pipe mold, and repeatedly using the main pipe mold.

Before the polymer layer is laid and applied externally in the step 2), the steel wire at the end part of the flange and the second composite reinforcing layer need to be subjected to shape modification treatment, and redundant parts are filled or removed, so that the perimeter size deviation of the steel wire and the second composite reinforcing layer meets the design requirement.

The pressure setting in the step 2) is to wind or bind any one of cord fabric, nylon cloth, nylon threads or nylon ropes, the winding tension is 5-50 MPa, the pressure setting time is 5-60min, and then the product is dismantled.

The bonding strength between the polymer material in the steel wire reinforced layer and the flange cylinder after vulcanization in the step 3) is not lower than 3N/mm.

Compared with the prior art, the invention has the beneficial effects that: 1) the rubber polymer material is combined with the wound steel wire reinforcement layer, and trapezoidal rubber is filled in the steel wire gaps, so that the steel wire is fixed on one hand, and the damage of the steel wire to the steel wire body after the steel wire body deforms can be avoided on the other hand; 2) the pipe body is firmly connected into a whole by the functional layers of various different mechanical structures, and the binding force is strong, so that the integral deformation resistance of the pipe body is improved, the stripping phenomenon of steel wires under the long-term stretching, bending and twisting actions of the pipe body can be effectively avoided, the influence of fatigue damage is reduced, and the service life of the pipe body is prolonged.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a schematic view of a layer structure of a pipe body according to embodiment 1 of the present invention;

FIG. 3 is a schematic view of the installation of a main pipe mold before molding in embodiment 1 of the present invention;

FIG. 4 is a flow chart of a molding process in example 1 of the present invention.

In the figure: 1-wear-resistant polymer layer, 2-warning polymer layer, 3-first composite reinforcing layer, 4-steel wire reinforcing layer, 5-steel wire filling layer, 6-second composite reinforcing layer, 7-external application polymer layer, 8-pipe body, 9-flange, 10-main pipe mould, 11-flange cylinder and 12-flange hoop.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example 1

Referring to fig. 1 and fig. 2, which are schematic structural diagrams of an embodiment 1 of the multi-layer reinforced dredging pipe of the present invention, a pipe body 8 and flanges 9 located at two ends of the pipe body are sequentially provided, from inside to outside, with a wear-resistant polymer layer 1, a warning polymer layer 2, a first composite reinforcing layer 3, a steel wire reinforcing layer 4, a steel wire filling layer 5, a second composite reinforcing layer 6 and an externally applied polymer layer 7, wherein the thickness of the wear-resistant polymer layer 1 is 40mm, the thickness of the warning polymer layer 2 is 12mm, the thickness of the first composite reinforcing layer 3 is 15mm, the thickness of the steel wire reinforcing layer 4 is 6mm, the thickness of the steel wire filling layer 5 is 6mm, the thickness of the second composite reinforcing layer 6 is 15mm, and the thickness of the externally applied polymer layer 7 is 3 mm.

In example 1, the first composite reinforcing layer and the second composite reinforcing layer were made by winding a reinforcing rubber sheet made by mixing a mesh fabric with a nitrile rubber layer. The wear-resistant polymer layer is a butadiene-acrylonitrile rubber layer. The steel wire reinforcing layer 5 is wound with steel wires.

Referring to fig. 3-4, the forming process of the multilayer reinforced dredging pipe of the invention comprises main pipe mould preparation, functional layer laying, vulcanization forming and demoulding, and takes the manufacture of a pipe body with the inner diameter of 800mm and the length of 11700mm as an example, and comprises the following steps:

1) the main pipeline mold is prepared, and the flange cylinder is processed, positioned and matched, wherein the main pipeline mold 10 is processed by sand blasting, coating, brushing, painting or glue smearing liquid, and high polymer material edge covering. Carrying out sand blasting treatment on the outer surface and the inner surface edges of the flange cylinder 11 to enable the grade of the flange cylinder to reach Sa2 grade; coating glue solution on the surface of the flange cylinder after sand blasting; and after the pipe is air-dried, wrapping and winding nitrile rubber, and then sleeving two flange barrels 11 at two ends of the main pipe mould, wherein the distance between the outer edges of the flanges at the two ends is 11700 mm.

2) Laying all functional layers, winding a wear-resistant polymer layer 1 of wear-resistant nitrile rubber between the paired flanges for multiple times, wherein the total thickness of the wound wear-resistant nitrile rubber is 40 mm; then winding a warning macromolecule layer 2, and respectively winding yellow nitrile rubber and red nitrile rubber, wherein the thickness of each layer is 6 mm; then winding a clean cloth strip with certain strength to pressurize and shape the pipe body, wherein the winding tension is 20MPa, the circumference of the pipe body is measured to be 2851mm after winding the pressurized cloth strip, and removing the cloth strip after winding for 10 min; winding nitrile rubber on the outer surface of the flange 9 and two sides of the flange hoop 12, then winding clean cloth strips with certain strength to pressurize and shape the pipe body, and removing the cloth strips after winding for 10 min; winding a reinforcing rubber sheet prepared by mixing screen cloth and nitrile rubber on the outer surfaces of the pipe body and the flange, wherein the thickness of the reinforcing rubber sheet is 1.5mm, the winding angle is 50 degrees, the total thickness of the wound first composite reinforcing layer 3 is 15mm, winding a clean cloth strip with certain strength to perform pressure shaping on the pipe body, and removing the cloth strip after winding for 10 min; steel wires with the diameter of 4mm are wound on the outer pipeline body of the strengthening layer from one end flange barrel to the other end flange barrel, the winding distance is 5mm, and trapezoidal rubber is filled in gaps of the steel wires to form a steel wire filling layer 5; winding a second composite reinforcing layer 6 which is formed by mixing screen cloth and nitrile rubber on the outer surfaces of the pipe body and the flange, wherein the thickness of the second composite reinforcing layer is 1.5mm, the winding angle is 50 degrees, the total thickness after winding is 15mm, winding a clean cloth strip with certain strength to perform pressure setting on the pipe body, the winding tension is 20MPa, and removing the cloth strip after winding for 10 min; welding a steel wire of the flange to the flange cylinder, cutting the strengthening layer, and continuously filling rubber at the rubber-lacking part; and winding a neoprene external application high polymer layer 7 outside the whole pipe, winding a clean cloth strip with certain strength to pressurize and shape the pipe body, and measuring the circumferences of three positions of the pipe body after shaping, wherein the average value of the circumferences is 3130 mm.

3) And (3) vulcanizing, namely, continuously vulcanizing the whole pipe until the pipe is molded, and finally vulcanizing the whole pipe at the vulcanizing temperature of 110 ℃ for 600 min. The bonding strength between the polymer material in the steel wire reinforced layer and the steel wire after vulcanization is not lower than 3N/mm.

4) And (4) demolding, namely taking the pipe body down from the main pipe mold, and repeatedly using the main pipe mold.

Examples 2 to 4

The multi-layer reinforced dredging pipe of examples 2-4 was formed in the same manner as in example 1, wherein the dimensional parameters of the functional layers are shown in Table 1 below, and the forming process parameters are shown in Table 2 below.

TABLE 1

TABLE 2

Therefore, in the above embodiment of the invention, by adopting the structural form of combining the rubber polymer material and the wound steel wire reinforcement layer, and filling the trapezoidal rubber in the steel wire gap, on one hand, the steel wire is fixed, on the other hand, the damage of the steel wire to the pipe body after the pipe body is deformed can be avoided, and the problem that the pipe body of the dredging pipe is continuously subjected to fatigue damage in a severe environment is solved. Meanwhile, the functional layers of various different mechanical structures are firmly connected into a whole, and the binding force is obviously enhanced, so that the integral deformation resistance of the pipe body is improved, and the service life of the pipe body can be prolonged to 3 years from 6 months.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and its inventive concept within the technical scope of the present invention.