阅读说明：本技术 一种零负泊松比金属骨架复合挠性接管及其制备方法 (Zero negative Poisson ratio metal framework composite flexible connecting pipe and preparation method thereof ) 是由 薛新 吴芳 邵一川 陈小超 廖娟 于 2021-09-23 设计创作，主要内容包括：本发明提供一种零负泊松比金属骨架复合挠性接管及其制备方法,包括挠性管体以及设置在挠性管体上、下方的端口接口法兰,所述挠性管体由多个空间棱锥形结构单元组成,每个空间棱锥形结构单元由金属丝基本单元和橡胶单元聚合物层组成,用以呈现零负泊松比力学性能。本发明采用双相复合的材料形式,既保留金属骨架优越的力学性能,又保证挠性接管拥有足够的刚度和强度,解决了现有技术中挠性接管不耐高温、高压、高速等工况。此外,本装置采用特殊的空间棱锥形结构,使得带金属丝基本单元的金属丝网骨架层呈现零/负泊松比的力学性能,提升管件抗冲击、减振降噪、位移补偿等方面的综合性能。(The invention provides a zero negative Poisson ratio metal framework composite flexible connecting pipe and a preparation method thereof. The invention adopts a two-phase composite material form, not only retains the superior mechanical property of the metal framework, but also ensures that the flexible connecting pipe has enough rigidity and strength, and solves the working conditions that the flexible connecting pipe in the prior art cannot resist high temperature, high pressure, high speed and the like. In addition, the device adopts a special space pyramid structure, so that the metal wire mesh framework layer with the metal wire basic units has zero/negative Poisson ratio mechanical property, and the comprehensive properties of the pipe fittings in the aspects of impact resistance, vibration reduction, noise reduction, displacement compensation and the like are improved.)

1. The zero-negative Poisson ratio metal framework composite flexible connecting pipe is characterized by comprising a flexible pipe body and port interface flanges arranged on the upper portion and the lower portion of the flexible pipe body, wherein the flexible pipe body is composed of a plurality of space pyramid-shaped structural units, and each space pyramid-shaped structural unit is composed of a metal wire basic unit and a rubber unit polymer layer and is used for presenting zero-negative Poisson ratio mechanical properties.

2. The zero negative poisson's ratio metal skeleton composite flexible pipe of claim 1, wherein the plurality of spatial pyramid-shaped structural units are formed by a wire skeleton layer formed by a plurality of wire basic units and a rubber polymer layer formed by a plurality of rubber unit polymer layers.

3. The zero negative poisson's ratio metal framework composite flexible connecting pipe of claim 1, wherein the metal wire basic unit comprises at least two metal wires, the two metal wires are arranged in a crossed mode and are in a pyramid shape, and the rubber unit polymer layer wraps the two metal wires and is in a pyramid shape with a cavity inside.

4. The zero-negative Poisson ratio metal framework composite flexible connecting pipe as claimed in claim 1, wherein the metal wire mesh framework layer is made of a metal wire mesh weaving device, the metal wire mesh weaving device comprises an upper limit unit, a plurality of columns and a lower limit unit which are sequentially arranged from top to bottom, the plurality of columns comprise outer columns and inner columns, the plurality of inner columns are circumferentially distributed and arranged at intervals, the plurality of outer columns are circumferentially distributed and arranged at intervals, and the inner columns and the outer columns are arranged in a staggered manner.

5. The zero negative poisson's ratio metal framework composite flexible connecting pipe as claimed in claim 4, wherein said outer column is provided with a plurality of outer holes along the length direction of the outer column, said inner column is provided with a plurality of inner holes along the length direction of the inner column, and the outer holes and the inner holes are provided with detachable positioning rings for sequentially winding and weaving metal wires into a plurality of metal wire basic units according to a certain rule.

6. The zero negative Poisson ratio metal framework composite flexible connecting pipe as claimed in claim 4, wherein an upper end cap is arranged above the upper limiting unit, and a lower end cap is arranged below the lower limiting unit.

7. The zero negative Poisson ratio metal framework composite flexible connecting pipe as claimed in claim 4, wherein a central shaft is arranged between the middle part of the upper limit unit and the middle part of the lower limit unit; go up the bit cell lower surface, down the bit cell upper surface and all be provided with the annular, annular outer lane edge is equipped with a plurality of outer arc holes, annular inner circle edge is equipped with a plurality of interior arc holes, the annular is internally mounted and is fixed the clamping ring.

8. The zero negative poisson's ratio metal framework composite flexible connecting pipe as claimed in claim 1, wherein the flexible pipe body is formed by installing combined dies inside and outside the metal wire mesh framework layer and then pouring rubber polymer into the combined dies for vulcanization, the combined dies comprise an outer combined die and an inner combined die, and a plurality of pyramid cavities are arranged inside the outer die combination; a supporting column penetrates through the middle of the inner combined mold, and a plurality of pyramids are arranged outside the inner combined mold; a buckle is arranged outside the outer combined mould, and the outer combined mould is formed by splicing and encircling a plurality of outer moulds into a hollow cylinder; the inner combined die consists of an inner die A, an inner die B, an inner die C, an inner die D and an inner die E.

9. A method for preparing a zero negative poisson's ratio metal framework composite flexible connecting pipe according to claim 8, which comprises the following steps: (1) assembling a metal wire netting device, and weaving a plurality of metal wire basic units on the metal wire netting device to manufacture a metal wire net framework layer; (2) port interface flanges are welded at the upper end and the lower end of the metal wire mesh framework layer; (3) sleeving an outer combined mold outside the metal wire mesh framework layer, and fixing the outer combined mold through a buckle; (4) mounting the inner combined die inside the metal mesh framework layer, and penetrating a support pillar into the middle of the inner combined die for positioning; (5) introducing rubber polymer into the combined die for vulcanization molding, and wrapping a plurality of metal wire basic units to form a flexible pipe body; (6) after the flexible pipe body is manufactured, the buckle is disassembled, and the outer combined mould is separated from the flexible pipe body; (7) and (4) taking out the supporting column, firstly removing the inner mold E, and then withdrawing the inner mold A, the inner mold B, the inner mold C and the inner mold D in the clockwise direction.

10. The method for preparing the zero-negative Poisson's ratio metal framework composite flexible connecting pipe as claimed in claim 9, wherein in the step (1), when the metal wire netting device is assembled, the fixed press rings are firstly installed on the upper limiting unit and the lower limiting unit, the lower end cover is installed below the lower limiting unit, then the pillar and the central shaft are inserted into the hole at the preset position on the upper surface of the lower limiting unit, the upper limiting unit is installed above the pillar, and finally the upper end cover is installed above the upper limiting unit.

Technical Field

The invention relates to a zero negative Poisson ratio metal framework composite flexible connecting pipe and a preparation method thereof.

Background

With the development of high performance of mechanical equipment, especially the technical requirements of vibration reduction, noise reduction, high pressure resistance, large deformation resistance and the like of a pipeline system, the use frequency of the flexible connecting pipe is increasingly increased, and the requirements on the comprehensive mechanical property and the safety and reliability of the flexible connecting pipe are increasingly high. The existing flexible connecting pipes mainly comprise three types, namely vacuum rubber pipes, plastic pipes and corrugated pipes. Under the conditions of high temperature, high pressure and large load impact, the working life of the three types of flexible connecting pipes is often lower than the rated life, and the technical requirements are difficult to meet.

The existing metal corrugated pipe has certain flexibility and elasticity, and the general wall thickness is thinner, so that the integral rigidity and strength are reduced. Therefore, under the condition of strong impact load, the metal corrugated pipe has low load bearing capacity and is easy to cause part failure. In contrast, increasing the wall thickness of the metal bellows reduces the flexibility and elasticity of the metal bellows.

The traditional vacuum rubber tube and plastic tube have simple manufacturing process and certain displacement compensation capability. However, the flexible pipe has limited application places due to low strength of the material, such as low flexibility in high-pressure and high-temperature pipeline systems, and undesirable displacement compensation and vibration reduction performance.

Disclosure of Invention

The invention improves the problems, namely the technical problem to be solved by the invention is to provide the zero-negative poisson ratio metal framework composite flexible connecting pipe and the preparation method thereof, the comprehensive performances of impact resistance, vibration and noise reduction and displacement supplement of the pipe are improved, the pipe is suitable for various complex working conditions, and meanwhile, the zero-negative poisson ratio metal framework composite flexible connecting pipe has zero/negative poisson ratio mechanical characteristics and can reduce deformation influence caused by load.

The flexible pipe comprises a flexible pipe body and port interface flanges arranged on the upper part and the lower part of the flexible pipe body, wherein the flexible pipe body consists of a plurality of space pyramid-shaped structural units, and each space pyramid-shaped structural unit consists of a metal wire basic unit and a rubber unit polymer layer and is used for showing zero negative Poisson ratio mechanical property.

Further, the plurality of spatial pyramid-shaped structural units are constituted by a wire mesh skeleton layer constituted by a plurality of wire basic units and a rubber polymer layer constituted by a plurality of rubber unit polymer layers.

Furthermore, the metal wire basic unit comprises at least two metal wires, the middle parts of the two metal wires are arranged in a crossed mode and are in a pyramid shape, and the rubber unit polymer layer wraps the two metal wires and is in a pyramid shape with a cavity inside.

Further, wire mesh framework layer adopts the wire netting device to make, the wire netting device is including last bit cell, a plurality of stands and the lower bit cell that sets gradually from top to bottom, and a plurality of stands include outer column and inner column, and a plurality of inner columns are circumference distribution and interval setting, and a plurality of outer columns are circumference distribution and interval setting, inner column and outer column dislocation set.

Further, the outer column is provided with a plurality of outer holes along the length direction of the outer column, the inner column is provided with a plurality of inner holes along the length direction of the inner column, and detachable positioning rings are arranged on the outer holes and the inner holes in a penetrating mode and used for sequentially winding and weaving metal wires into a plurality of metal wire basic units according to a certain rule.

Furthermore, an upper end cover is arranged above the upper limiting unit, and a lower end cover is arranged below the lower limiting unit.

Furthermore, a central shaft is arranged between the middle part of the upper limit unit and the middle part of the lower limit unit.

Further, go up the bit cell lower surface, down the bit cell upper surface and all be provided with the annular, annular outer lane edge is equipped with a plurality of outer arc holes, annular inner circle edge is equipped with a plurality of interior arc holes, install fixed clamping ring in the annular.

Furthermore, the flexible pipe body is formed by installing combined dies inside and outside the metal wire mesh framework layer and then pouring rubber polymer into the combined dies for vulcanization, the combined dies comprise an outer combined die and an inner combined die, and a plurality of pyramid cavities are arranged inside the outer die combination; the support column is arranged in the middle of the inner combined die in a penetrating mode, and a plurality of pyramids are arranged outside the inner combined die.

Furthermore, a buckle is arranged outside the outer combined mould, and the outer combined mould is spliced by a plurality of outer moulds and is encircled into a hollow cylinder shape; the inner combined die consists of an inner die A, an inner die B, an inner die C, an inner die D and an inner die E.

Further, the preparation method of the zero negative Poisson ratio metal framework composite flexible connecting pipe comprises the following steps: (1) assembling a metal wire netting device, and weaving a plurality of metal wire basic units on the metal wire netting device to manufacture a metal wire net framework layer; (2) port interface flanges are welded at the upper end and the lower end of the metal wire mesh framework layer; (3) sleeving an outer combined mold outside the metal wire mesh framework layer, and fixing the outer combined mold through a buckle; (4) mounting the inner combined die inside the metal mesh framework layer, and penetrating a support pillar into the middle of the inner combined die for positioning; (5) introducing rubber polymer into the combined die for vulcanization molding, and wrapping a plurality of metal wire basic units to form a flexible pipe body; (6) after the flexible pipe body is manufactured, the buckle is disassembled, and the outer combined mould is separated from the flexible pipe body; (7) and (4) taking out the supporting column, firstly removing the inner mold E, and then withdrawing the inner mold A, the inner mold B, the inner mold C and the inner mold D in the clockwise direction.

Further, in the step (1), when the metal wire netting device is assembled, the fixed compression ring is installed on the upper limiting unit and the lower limiting unit, the lower end cover is installed below the lower limiting unit, the support column and the central shaft are inserted into the upper limiting unit according to the preset position hole position on the upper surface of the lower limiting unit, the upper limiting unit is installed above the support column, and the upper end cover is installed above the upper limiting unit.

Compared with the prior art, the invention has the following beneficial effects:

(1) the device is formed by combining special space pyramid structure units according to a circumferential array, can present zero/negative Poisson ratio mechanical property, enhances the whole shock resistance and displacement compensation capacity, and has longer service life compared with the traditional flexible connecting pipe.

(2) According to the preparation of the wire mesh framework layer of the device, the positioning and the position of the outer hole and the inner hole of the metal wire basic unit on the strut can be adjusted according to different working loads, the angle and the length of the pyramid are changed, so that the flexible pipe body after double-phase compounding shows different Poisson ratios, and the device is better suitable for complex and various working environments.

(3) The invention adopts a double-phase composite form, and the structure of the flexible pipe body is divided into a metal wire mesh framework layer and a rubber polymer surface layer. The form can ensure that the metal framework composite flexible connecting pipe has mechanical properties of high strength and high rigidity on the premise of higher flexibility and elasticity, so that the multifunctional characteristics of damage resistance, service life extension, displacement compensation, fatigue resistance, high strength and the like can be improved under the working conditions of high temperature, high pressure and large deformation.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a metal wire netting device according to an embodiment of the present invention;

FIG. 3 is an exploded view of a combination die and flexible pipe body according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a spatial pyramid-shaped structural unit according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a basic unit structure of a wire according to an embodiment of the present invention;

FIG. 6 is a partial schematic view of a wire mesh carcass layer according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of an upper bit-limit unit or a lower bit-limit unit according to an embodiment of the present invention;

FIG. 8 is a schematic view of a retaining ring and a post according to an embodiment of the present invention;

FIG. 9 is a top view of an exemplary internal mold assembly of the present invention;

in the figure: 1-port interface flange; 2-a flexible pipe body; 3-wire mesh skeleton layer; 4-a wire netting device; 41-upper limit bit cell; 42-upright column; 421-outer column; 4211-outer hole; 422-inner upright column; 4221-inner hole; 43-upper end cap; 44-lower end cap; 45-central axis; 46-a ring groove; 47-outer arc shaped hole; 48-inner arc hole; 49-lower limit bit cell; 5-a spatial pyramidal structural unit; 51-wire basic unit; 511-wire, 52-rubber unit polymer layer; 6-fixing a compression ring; 7-outer combined mould; 71-pyramid cavities; 72-buckling; 8-inner combined mould; 81-pyramids; 82-inner mould a; 83-inner mould B; 84-inner mold C; 85-inner mold D; 86-inner mold E; 9-a support column; 10-a positioning ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Example 1: referring to the attached drawings 1-9, the zero negative poisson's ratio metal framework composite flexible connecting pipe comprises a flexible pipe body 2 and port interface flanges 1 arranged on the upper portion and the lower portion of the flexible pipe body, wherein the flexible pipe body is composed of a plurality of space pyramid structure units 5 arrayed in the circumferential direction, each space pyramid structure unit 5 is formed by vulcanizing a metal wire basic unit 51 and a rubber unit polymer layer 52, and the rubber unit polymer layer is in a hollow bottomless space pyramid shape and is used for presenting zero negative poisson's ratio mechanical property.

The plurality of spatial pyramid-shaped structural units described above are constituted by the wire-mesh skeleton 3 and the rubber polymer layer, the wire-mesh skeleton layer 4 being constituted by the plurality of wire basic units 51, and the rubber polymer layer being constituted by the plurality of rubber unit polymer layers 52.

After the metal wire mesh framework layer is woven, port interface flanges are welded at the upper end and the lower end of the metal wire mesh framework layer, then a combined die is arranged inside and outside the metal wire mesh framework layer, and then rubber polymer is filled in and vulcanized into a rubber polymer layer, so that the flexible pipe body is manufactured.

In this embodiment, the wire base unit 51 includes at least two wires 511, the two wires are overlapped and arranged together and have a pyramid shape, and the rubber unit polymer layer covers the two wires and has a pyramid shape with a hollow inside.

In the present embodiment, the metal wire mesh framework layer is made by using a metal wire netting device 4;

the wire netting device is including last bit cell 41, a plurality of stands 42 and the lower bit cell 49 that from top to bottom sets gradually, and a plurality of stands include outer stand 421 and inner column 422, and a plurality of inner columns are circumference distribution and interval setting, and a plurality of outer stands are circumference distribution and interval setting, inner column and outer stand dislocation set.

In this embodiment, the outer column is provided with a plurality of outer holes 4211 along the length direction of the outer column, the inner column is provided with a plurality of inner holes 4221 along the length direction of the inner column, and the outer holes and the inner holes are provided with detachable positioning rings 10 in a penetrating manner; positioning rings are firstly inserted into corresponding inner holes and outer holes, then metal wires are sequentially inserted through the positioning rings according to a certain rule to be wound and woven into a metal wire mesh framework layer, after the metal wire mesh framework layer is woven, adjacent metal wire basic units in the metal wire mesh framework layer are fixed, and the positioning rings are taken down.

The angles and the lengths of the space pyramid-shaped structural units are determined by changing the positions of the outer stand columns and the inner stand columns and the outer holes and the inner holes, so that the Poisson ratio effect of the wire mesh framework layer is changed.

In the present embodiment, an upper end cap 43 is disposed above the upper limit unit, and a lower end cap 44 is disposed below the lower limit unit.

The upper end cover is connected to the upper limit unit through a bolt, and the lower end cover is connected to the lower limit unit through a bolt.

In the present embodiment, a central shaft 45 is disposed between the upper limit unit middle part and the lower limit unit middle part.

The lower limiting unit is positioned through the square arranged at the bottom end of the central shaft, and the upper limiting unit is positioned according to a shaft shoulder on the central shaft.

In the embodiment, in order to facilitate the processing of the hole site, the lower surface of the upper limit unit and the upper surface of the lower limit unit are both provided with a ring groove 46, the edge of the outer ring of the ring groove is provided with a plurality of outer arc-shaped holes 47, the edge of the inner ring of the ring groove is provided with a plurality of inner arc-shaped holes 48, and a fixed compression ring 6 is installed in the ring groove; the fixed compression ring is fixed in the annular groove through a bolt.

After installing fixed clamping ring to lower limiting unit, last spacing unit, arrange the stand in outer arc hole and interior arc downthehole in, spacing stand circumferencial direction, guarantee that the pillar is in the installation of presetting the position.

In order to carry out spacingly to the circumferencial direction of outer stand and inner column, outer stand and inner column are the cylinder originally, cut off partly with the cylinder is vertical, and the outer arc hole of difference adaptation simultaneously and interior arc hole to reach restriction outer stand, inner column and rotate. Meanwhile, the upper end cover and the lower end cover limit the up-and-down movement of the outer support and the inner support; the position of the upright post is positioned through the inner arc-shaped hole and the outer arc-shaped hole of the upper limiting unit and the lower limiting unit.

When the metal wire netting device is assembled, the fixed compression rings are installed on the upper limiting unit and the lower limiting unit, the lower end cover is installed below the lower limiting unit, the supporting column and the central shaft are inserted into the hole at the preset position on the upper surface of the lower limiting unit, the upper limiting unit is installed above the supporting column, and the upper end cover is installed above the upper limiting unit.

When a metal wire netting device is adopted to weave a metal wire framework core layer, two adjacent inner and outer struts are selected as an initial, a first hole of the outer strut is used for fixing a metal wire, then, holes are sequentially wound on the inner and outer struts at intervals, another metal wire penetrates through the holes to be used as a positioning ring to be knotted and fixed, and after the row is woven, circumferential weaving is carried out until the outer strut returns to the first outer strut and is fixed in the initial hole.

In this embodiment, during preparation, after the wire mesh framework layer is completed, the port interface flanges are welded above and below the wire mesh framework layer, and the flexible pipe fitting is finally formed by installing the combined dies inside and outside the wire mesh framework layer and then injecting the rubber polymer; when the external connection is carried out, the connection and the use are carried out only through the bolt and the port interface flange.

Example 2: on the basis of embodiment 1, in this embodiment, the flexible pipe body is formed by installing combined molds inside and outside a metal mesh framework layer, and then injecting rubber polymer for vulcanization, where the combined molds include an outer combined mold 7 and an inner combined mold 8, and a plurality of pyramid cavities 71 are arranged inside the outer mold combination; the middle part of the inner combined die is provided with a support pillar 9 in a penetrating way, and the outer part of the inner combined die is provided with a plurality of pyramids 81.

The metal wire basic unit is positioned between the pyramid cavity and the pyramid, and the rubber polymer is vulcanized and molded to complete the double-phase compounding of the flexible connecting pipe.

In this embodiment, a buckle 72 is disposed outside the outer combined mold, and the outer combined mold is formed by splicing and encircling a plurality of outer molds into a hollow cylinder; the inner combined mold 8 is composed of an inner mold a82, an inner mold B83, an inner mold C84, an inner mold D85, and an inner mold E86.

In this embodiment, when the combined mold is used, the exterior of the metal mesh framework layer is fixed with the outer combined mold through the buckle, the interior of the metal mesh framework layer penetrates into the inner combined mold, and the middle of the inner combined mold penetrates into the support column; when the combined die is disassembled, the buckle is disassembled firstly, the outer combined die is separated from the flexible pipe body, then the supporting column is pushed out, finally the inner die E is withdrawn firstly, and other inner dies (the inner die A, the inner die B, the inner die C and the inner die D) are withdrawn clockwise.

In this example, when preparing a flexible pipe body: (1) weaving a plurality of metal wire basic units on a metal wire netting device to manufacture a metal wire net framework layer; (2) port interface flanges are welded at the upper end and the lower end of the metal wire mesh framework layer; (3) sleeving an outer combined mold outside the metal wire mesh framework layer, and fixing the outer combined mold through a buckle; (4) mounting the inner combined die inside the metal mesh framework layer, and penetrating a support pillar into the middle of the inner combined die for positioning; (5) introducing rubber polymer into the combined die for vulcanization molding, and wrapping a plurality of metal wire basic units to form a flexible pipe body; (6) after the flexible pipe body is manufactured, the buckle is disassembled, and the outer combined mould is separated from the flexible pipe body; (7) and (4) taking out the supporting column, firstly removing the inner mold E, and then withdrawing the inner mold A, the inner mold B, the inner mold C and the inner mold D in the clockwise direction.

Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.

If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.

Meanwhile, if the invention as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).

In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.

Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.

Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.