Anti-bending rubber tube simulating artery blood vessel

Abstract

The invention discloses an anti-bending rubber tube simulating an artery blood vessel, and belongs to the technical field of engineering machinery. The anti-bending rubber tube comprises an inner contact layer, a first reinforcing layer, a flame-retardant sliding and twisting layer, a sliding and twisting anti-bending layer, an anti-pulling reinforcing layer and a weather-proof layer which are sequentially arranged from inside to outside in the radial direction. The first reinforcing layer adopts aramid fiber cloth and the inner contact layer to form a resin tube, the first reinforcing layer is coated with the flame-retardant sliding and twisting layer, the sliding and twisting anti-folding layer is connected to the outside of the flame-retardant sliding and twisting layer through extrusion forming, the anti-pull reinforcing layer is connected to the outside of the sliding and twisting anti-folding layer through winding of carbon fiber cloth, and the weather-proof layer is connected to the outside of the anti-pull reinforcing layer through extrusion forming; the inner contact layer is configured to be a hard and smooth nylon layer, so that the friction loss of the pipe wall to oil and the absorption consumption of the pipeline to pulsation energy can be reduced; the sliding-twisting anti-bending layer is configured to be thick rubber, the binding force between the flame-retardant sliding-twisting layer and the sliding-twisting anti-bending layer is smaller than that between the flame-retardant sliding-twisting layer and the resin pipe, and due to the flexible binding length, the bending resistance of the rubber pipe is improved, and the pull-out resistance of the resin pipe is enhanced.

Description

Technical Field

[0001] The present application belongs to the technical field of engineering machinery, and specifically relates to an anti-bending rubber hose imitating an arterial blood vessel. Background Art

[0002] Regardless of whether the valve core of the switch valve in the digital hydraulic system is a valve core rotated by a stepper motor or a valve core of a slide valve controlled by an electromagnetic switch, the frequency of the switch valve does not exceed 100 Hz per minute. Taking the switch valve frequency of 60 Hz per minute as an example, according to the requirements of ISO6803 or ISO6605 for pulse testing, the hose can only work for 200,000 times / 60 Hz / 3600 = 0.9 hours. Therefore, if the equipment needs to work continuously for 500 hours, it will need to be more than 500*3600*60 Hz = 108e 6 Special pulsation-resistant hose with a maximum impact pulse resistance.

[0003] However, the rubber hoses currently used are divided into inner rubber, middle rubber and outer rubber. The middle rubber is located between the reinforcing materials such as braided steel wires or wound steel wires, and is mainly used to reduce the interference friction and extrusion between the braided steel wires or wound steel wires. In order to prevent the delamination of the steel wire reinforcement layer and the middle rubber layer, the middle rubber is generally very thin. The standard requires that the pull-out force between the middle rubber and the steel wire is not less than 100N. Therefore, the relative buffer space between the steel wire and the middle rubber is small, and it is easy to concentrate stress when the pulsation frequency increases, causing the tearing of the middle rubber and the steel wire and driving the tearing between the steel wire layer and the inner rubber, thereby causing the inner rubber to rupture and cause leakage failure;

[0004] Especially when applied to digital hydraulic intelligent control systems, the four-layer steel wire winding layer can solve the impact of the lateral fluctuation of pressure caused by the pump source itself in conventional hydraulic systems on the pipeline, but the high-pressure pulsation pipeline introduced by it, and the method of discrete control of high-pressure fluid flow will introduce new pressure pulsation. If this pressure pulsation is concentrated in the steel pipe, since the elastic modulus of the steel pipe is much larger than the elastic modulus of the hydraulic oil, the main body of this pulse forms a forward power in the form of forward compression and rolling, and this power is beneficial and can promote the rapid movement of the pulsation of high-pressure fluid flow. However, due to the limitation of equipment space and the requirement of flexible use of hydraulic pipelines at movable joints, a hose-like structure in the form of a hose will still be used in the hydraulic system. However, if a conventional hose is used, since the inner layer of the hose is rubber and steel wire is used as a reinforcement layer, this part of the beneficial pulsation will be absorbed and consumed by the elastic inner layer, resulting in energy loss. Therefore, a hose that can utilize this part of the beneficial pulsation rather than suppressing most of it is needed to adapt to modern discrete fluid transmission.

[0005] Resin hoses usually use nylon extruded hoses as the inner core, and are reinforced by braiding or winding high-strength industrial fibers or steel wires to form high-pressure hoses. Nylon has good wear resistance and self-lubrication, a smooth surface, a small friction coefficient, and strong resistance to alkali and most salt solutions, weak acids, engine oil, gasoline, etc., so it has good corrosion resistance. Because nylon has excellent resilience, it can be restored to its original state after stretching, and can be used for lining pulsating flow pipelines. In addition, nylon has a small curing shrinkage rate, generally 1% to 2%. It is one of the varieties with the smallest curing shrinkage rate among thermosetting resins (phenolic resin is 8% to 10%; unsaturated polyester resin is 4% to 6%; silicone resin is 4% to 8%). The linear expansion coefficient is also very small, generally 6×10-5 / ℃. These technical features are very suitable for reducing the energy loss of pulsating flow in modern discrete fluid transmission. However, resin pipes have the problem of weak pull-out resistance in pipeline connections. Therefore, a new type of pipeline combining the characteristics of resin pipes and existing rubber pipes is urgently needed.

[0006] In order to prevent the outer wall of the existing rubber hose from being worn, a plastic protective sleeve or a steel wire protective sleeve is often used, which increases the working process and prolongs the production cycle.

[0007] In addition, since aramid has the strength of steel wire, but has the characteristic of poor bonding with rubber and is prone to slippage, current technology regards it as a disadvantage or a characteristic to be improved and circumvents it. Therefore, the prior art does not solve the problem of how to utilize its poor bonding with rubber, but only improves the perceived disadvantages. The present application intends to solve the problem of how to utilize this characteristic in the forward direction.

[0008] In order to meet the standard of explosion-proof pressure, the existing hoses use at least four layers of wound steel wire as reinforcement layers, which increases the overall weight of the hose, increases the difficulty of manufacturing and transportation, and is time-consuming and laborious for workers to carry and assemble. In addition, its high rigidity makes it difficult to bend the hose. Moreover, since the reinforcement layer of the hose is mostly composed of steel wire braiding or steel wire winding, each layer of steel wire winding is only separated by a thinner middle rubber layer, and the steel wire reinforcement layer is difficult to bend and deform, resulting in an excessively large bending radius, which makes it difficult to bend, causing difficulties in both manufacturing and use. Therefore, there is an urgent need for a hose with a small bending radius, light weight, and the ability to meet the high-pressure pulsating flow impact problem in digital hydraulic intelligent control systems. Summary of the invention

[0009] The present application provides an anti-bending hose that simulates arterial blood vessels to solve the above-mentioned technical problems that conventional hoses have large bending radius, heavy weight, and cannot meet the impact of high-pressure pulsating flow in digital hydraulic intelligent control systems.

[0010] The technical solution adopted in this application is:

[0011] An anti-bending rubber hose imitating an artery, comprising:

[0012] An inner contact layer, a first reinforcement layer, a flame retardant and rubbing layer, a rubbing and folding-resistant layer, an anti-pull-out reinforcement layer and a weatherproof layer are sequentially arranged from the inside to the outside in the radial direction; the first reinforcement layer is wound around the outside of the inner contact layer by means of aramid fiber cloth, the flame retardant and rubbing layer is coated on the outside of the first reinforcement layer, the rubbing and folding-resistant layer is connected to the outside of the flame retardant and rubbing layer by means of extrusion molding, the anti-pull-out reinforcement layer is connected to the outside of the rubbing and folding-resistant layer by means of carbon fiber cloth winding, and the weatherproof layer is molded outside the anti-pull-out reinforcement layer;

[0013] The inner contact layer is configured as a hard and smooth nylon layer, which reduces the friction loss of the pipe wall to the oil and the absorption and consumption of the pulsating energy by the pipeline; at the same time, the setting of the thickness of the nylon layer ensures that after the pulsating radial expansion energy flowing through is absorbed, the expansion energy is promptly fed back to the pulsating flow group flowing through through the resilience of the hard wall, so as to form a longitudinal pulsating auxiliary driving force, so that a quasi-rigid fluid space smooth channel is formed inside the inner contact layer.

[0014] The slip and fold resistance layer is configured as thicker rubber, and the bonding force between the flame-retardant slip and fold resistance layer and the resin tube is smaller than the bonding force between the flame-retardant slip and fold resistance layer and the resin tube. This flexible bonding length improves the bending resistance of the rubber tube and enhances the pull-off resistance of the resin tube.

[0015] The inner contact layer is configured as a hard and smooth nylon layer that can absorb a small part of the impact pressure at the front end of the pulsating flow and can be fed back to the rear of the pulsating flow in time, thereby reducing the friction loss of the pipe wall to the oil and the energy absorption and consumption of the pipeline. Specifically, the energy of the pulsating flow energy of the relative slip along the longitudinal direction of the hose is absorbed by the inner wall. Under the timely rebound force after the pulsation, the lateral expansion energy of the pulsating part absorbed by the inner contact layer can be fed back to the pulsating flow group flowing through, so as to form a longitudinal pulsating driving force coordinated with the pulsating frequency, so that a quasi-rigid fluid space smooth channel for pulsating wave velocity flow is formed inside the inner contact layer. This structure that reduces the pulsating energy loss actually solves the problem of the impact amplitude of the pulsation on the pipe wall, thereby extending the pipeline's anti-pulse fatigue life, and can meet the improvement and solution of the high-pressure pulsating flow impact problem in the digital hydraulic intelligent control system.

[0016] The anti-bending rubber hose imitating an arterial blood vessel of the present application also has the following additional technical features:

[0017] The aramid fiber cloth is wound in a left-hand spiral along the axial direction on the outside of the inner contact layer; the carbon fiber cloth is wound in a right-hand spiral along the axial direction on the outside of the slip and rubbing anti-folding layer; or, the aramid fiber cloth is wound in a right-hand spiral along the axial direction on the outside of the inner contact layer; the carbon fiber cloth is wound in a left-hand spiral along the axial direction on the outside of the slip and rubbing anti-folding layer.

[0018] The thickness δ of the aramid fiber cloth is calculated and balanced according to the inner diameter d of the hose and the withstand pressure P, so that the tensile strength σ of the aramid fiber cloth of the hose under four times the withstand pressure P satisfies 4P*d=σ*2δ.

[0019] The flame retardant and slip-resistant layer includes flame retardant particles coated on the outside of the first reinforcing layer, and the bonding strength between the flame retardant particles and nylon or aramid is more than twice the bonding strength between the flame retardant particles and the slip-resistant and anti-folding layer.

[0020] The thickness of the inner contact layer is 3 times the thickness of the aramid fiber cloth of the hose, that is, δ1=3δ, based on the ratio of the thickness of the inner wall of a normal artery to the thickness of the adjacent first reinforcement layer.

[0021] The inner contact layer is made of nylon material and cooperates with the first reinforcement layer to be extruded into a nylon resin tube.

[0022] According to the ratio of the thickness of the inner wall of a normal artery to the thickness of the adjacent first reinforcement layer being 3, the wall thickness δ1 of the inner contact layer is calculated by analogy to be 3 times the thickness δ of the aramid fiber cloth of the hose, that is, δ1=3δ.

[0023] According to the allowable compression rate of the sealing rubber in the range of 10%-43%, the variation range of the sliding anti-folding layer is calculated to be δ3=10%*δ2~43%*δ2.

[0024] The maximum radial expansion and contraction rate of the first reinforcement layer is not greater than 2%, and the maximum radial deformation of the inner diameter of the hose is obtained by δ4=2%*δ1.

[0025] The weatherproof layer uses weatherproof rubber as the extrusion molding material; or, the weatherproof layer uses a spiral plastic sheath to form a protective layer; or, the weatherproof layer is prepared with a steel wire sheath to form a protective layer; or, the weatherproof layer uses a protective coating that is sprayed on the outside of the anti-pull-out reinforcement layer to form a protective layer.

[0026] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0027] 1. The present application discloses an anti-bending rubber hose imitating an arterial blood vessel, comprising an inner contact layer, a first reinforcement layer, a flame-retardant slip layer, a slip and fold resistance layer, an anti-pull-out reinforcement layer and a weather-proof layer, which are arranged in sequence from the inside to the outside along the radial direction; the inner contact layer is configured as a hard and smooth nylon layer, which can absorb a small part of the impact pressure at the front end of the pulsating flow and can timely feed back to the rear of the pulsating flow, thereby reducing the friction loss of the pipe wall to the oil and the energy absorption and consumption of the pipeline. Specifically, the energy of the pulsating flow due to relative slip along the longitudinal direction of the hose is absorbed by the inner wall, and under the timely rebound force after the pulsation, the lateral expansion energy of the pulsating part absorbed by the inner contact layer can rebound and be fed back to the pulsating flow group flowing through, so as to form a longitudinal pulsating driving force coordinated with the pulsation frequency, so that a quasi-rigid fluid space smooth channel with pulsating wave velocity flow is formed inside the inner contact layer. This structure that reduces the pulsating energy loss actually solves the problem of the impact amplitude of the pulsation on the pipe wall. Considering that fatigue life is affected by both stress amplitude and stress value, reducing the value of any one factor can effectively prolong the fatigue life. Therefore, this structure also prolongs the pipeline's anti-pulse fatigue life. The wall thickness, deformation size and pulsating stress amplitude of the inner contact layer are properly controlled, which can meet the improvement and solution of the high-pressure pulsating flow impact problem in the digital hydraulic intelligent control system.

[0028] Therefore, the inner contact layer is configured as a hard and smooth nylon layer: the friction loss of the pulsating flow along the longitudinal direction of the hose is reduced; at the same time, the thickness of the nylon layer can ensure that the radial expansion energy of the pulsating flow is absorbed and fed back to the pulsating flow group in time through the resilience of the hard wall to form a longitudinal pulsating auxiliary driving force, so that a quasi-rigid fluid space smooth channel is formed inside the inner contact layer. Thereby reducing the energy absorption and consumption of the pipeline;

[0029] Moreover, in this application, high-strength process fiber cloth is used to replace the traditional steel wire reinforcement layer, which greatly reduces the weight of the overall hose and achieves the weight reduction demand. At the same time, the bending performance is greatly improved compared with the steel wire reinforcement layer;

[0030] On the other hand, by taking advantage of the poor bonding performance between the aramid fiber cloth of the first reinforcement layer and the rubber of the slip and fold anti-layer, slippage is formed between the aramid fiber cloth of the slip and fold anti-layer and the first reinforcement layer, reducing the shear deformation of the rubber of the slip and fold anti-layer and preventing the rubber of the slip and fold anti-layer from rupture. This ensures that in addition to the anti-leakage function of the inner contact layer, the rubber of the slip and fold anti-layer is also protected from leakage, thereby forming a multi-layer anti-leakage protection, which further improves the bending resistance of the hose.

[0031] 2. As a preferred embodiment of the present application, the aramid fiber cloth is wound on the outside of the inner contact layer in a left-hand spiral along the axial direction; the carbon fiber cloth is wound on the outside of the slip and folding anti-layer in a right-hand spiral along the axial direction; or, the aramid fiber cloth is wound on the outside of the inner contact layer in a right-hand spiral along the axial direction; the carbon fiber cloth is wound on the outside of the slip and folding anti-layer in a left-hand spiral along the axial direction.

[0032] The spiral direction of the aramid fiber cloth is left-handed, which is convenient for the right-handed thread of the commonly used hose connector. During the rotation process, the aramid cloth forms a reverse rotation expansion effect, driving the outer wall of the nylon tube of the inner contact layer to move toward the slip and fold anti-layer, playing a compression enhancement role, and preventing the aramid yarn or aramid fiber cloth from separating from the slip and fold anti-layer.

[0033] The high-strength carbon fiber cloth used in the anti-pullout reinforcement layer has a certain spiral direction, preferably consistent with the right-hand direction of the conventional hose joint, so as to adapt to the right-hand thread mostly used in conventional hose joints. During the rotation of the right-hand thread, the high-strength carbon fiber cloth used in the anti-pullout reinforcement layer forms a rotation follow-up effect with the sliding and rubbing anti-folding layer driven by the high-strength carbon fiber cloth used in the anti-pullout reinforcement layer. The high-strength carbon fiber cloth used in the anti-pullout reinforcement layer has a convergence movement during the forward rotation process, thereby avoiding the rubber adhesive between the sliding and rubbing anti-folding layer from tearing due to large misalignment, and further improving the bending resistance of the hose.

[0034] 3. As a preferred embodiment of the present application, the flame-retardant and slip-resistant layer includes flame-retardant particles coated on the outside of the first reinforcing layer, and the bonding strength between the flame-retardant particles and nylon or aramid is more than 2 times greater than the bonding strength between the flame-retardant particles and the slip-resistant and fold-resistant layer.

[0035] Flame retardant particles are easy to add to resin, clean and hygienic, have high flame retardant efficiency, small addition amount, little effect on the mechanical properties of the resin, and are not prone to delamination, patterning, precipitation and other undesirable phenomena after addition; flame retardant particles have good compatibility with resin, because in general, flame retardant particles (masterbatch) are specially treated to improve their compatibility with plastic resin, so that even if the amount added to the resin is large, it is not easy to cause delamination, frosting, patterning and other problems. However, when the amount added to the rubber layer is large, delamination is easy to occur. By adding flame retardant particles to reduce the flammability of the hose, it can release incombustible gas when heated, quickly cover the surface of the material, form a protective layer that isolates oxygen, and effectively slow down the spread of the flame, thereby further improving the anti-bending property of the hose while increasing the flame retardant properties.

[0036] 4. As a preferred embodiment of the present application, the inner contact layer is made of nylon material, matched with the first reinforcement layer, and is extruded into a nylon resin tube.

[0037] It not only ensures that the inner wall of the nylon resin tube is as smooth as a mirror, but also does not pollute the medium and is not polluted by the medium; it also has small power transmission loss and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0039] Figure 1 This is a schematic diagram of the internal structure of an anti-bending rubber hose imitating an artery blood vessel according to an embodiment of the present application;

[0040] In the figure,

[0041] 1. Inner contact layer; 2. First reinforcement layer; 3. Flame retardant and slip layer; 4. Slip and anti-folding layer; 5. Anti-pull-off reinforcement layer; 6. Weatherproof layer. DETAILED DESCRIPTION

[0042] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0043] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0044] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present application, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "implementation method", "example", "one embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0047] The present application relates to an anti-bending rubber hose imitating an arterial blood vessel, such as Figure 1 As shown, it includes an inner contact layer 1, a first reinforcement layer 2, a flame retardant sliding layer 3, a sliding anti-folding layer 4, an anti-pull-out reinforcement layer 5 and a weather-proof layer 6 which are arranged in sequence from the inside to the outside in the radial direction; the first reinforcement layer 2 is wound around the outside of the inner contact layer 1 by means of aramid fiber cloth, the flame retardant sliding layer 3 is coated on the outside of the first reinforcement layer 2, the sliding anti-folding layer 4 is connected to the outside of the flame retardant sliding layer 3 by means of extrusion molding, the anti-pull-out reinforcement layer 5 is connected to the outside of the sliding anti-folding layer 4 by means of carbon fiber cloth, and the weather-proof layer 6 is connected to the outside of the anti-pull-out reinforcement layer 5 by means of extrusion molding;

[0048] The inner contact layer 1 is configured as a hard and smooth nylon layer: reducing the friction loss of the pipe wall to the oil and the absorption and consumption of the pulsating energy by the pipeline; at the same time, the setting of the nylon layer thickness ensures that after the pulsating radial expansion energy flowing through is absorbed, the expansion energy is promptly fed back to the pulsating flow group flowing through through the resilience of the hard wall, so as to form a longitudinal pulsating auxiliary driving force, so that a quasi-rigid fluid space smooth channel is formed inside the inner contact layer 1; the slip and anti-folding layer 4 is configured as a thicker rubber, and the bonding force between the flame-retardant slip and anti-folding layer 3 and the slip and anti-folding layer 4 is smaller than the bonding force between the flame-retardant slip and anti-folding layer 4 and the resin tube. This flexible bonding length improves the bending resistance of the rubber tube and enhances the pull-off resistance of the resin tube.

[0049] The inner contact layer 1 is configured as a hard and smooth nylon layer that can absorb a small part of the impact pressure at the front end of the pulsating flow and can timely feed back to the rear of the pulsating flow, thereby reducing the friction loss of the pipe wall to the oil and the energy absorption and consumption of the pipeline. Specifically, the energy of the pulsating flow energy of the relative slip along the longitudinal direction of the hose is absorbed by the inner wall. Under the timely rebound force after the pulsation, the lateral expansion energy of the pulsating part absorbed by the inner contact layer 1 can be fed back to the pulsating flow group flowing through, so as to form a longitudinal pulsating driving force coordinated with the pulsating frequency, so that a quasi-rigid fluid space smooth channel for pulsating wave velocity flow is formed inside the inner contact layer 1. This structure that reduces the pulsating energy loss actually solves the problem of the impact amplitude of the pulsation on the pipe wall, thereby extending the pipeline's anti-pulse fatigue life, and can meet the improvement and solution of the high-pressure pulsating flow impact problem in the digital hydraulic intelligent control system.

[0050] In the present application, the inner contact layer 1 should not react chemically with the fluid medium, etc., and since the fiber and nylon have good compatibility, pressure resistance, temperature resistance, wear resistance, oil resistance, and long service life, the oil resistance of the nylon resin tube is more than 5 times higher than that of the rubber tube. Compared with the rubber tube of the same specification, the nylon resin tube has a higher pressure bearing capacity and a lower tube weight. Therefore, the inner contact layer 1 is preferably made of nylon material. The inner contact layer 1 is formed by extruding the nylon material on a hard core with stable dimensional accuracy to form a hose. The inner contact layer 1 is thin and hard, and the small deformation is to avoid radial shock absorption.

[0051] After the hose is formed, the hose is used as the inner core for winding the first reinforcement layer 2, and aramid yarn or aramid cloth is spirally wound outside the formed inner core to form the first reinforcement layer 2. Therefore, the first reinforcement layer 2 is formed by winding high-strength aramid fiber cloth outside the inner contact layer 1, and several layers of aramid fiber cloth in the first reinforcement layer 2 are staggered and stacked with conventional hose joints and then bonded by adhesive.

[0052] It is worth noting that: when the aramid fiber cloth is wound around the outside of the inner contact layer 1, resin adhesive fillers are coated between the aramid fiber cloth and the inner contact layer 1 and between the aramid fiber cloths of different layers to fix the amount of overlap between the wound aramid fiber cloths and the stability of the spiral pitch; the outermost aramid fiber cloth is not coated with adhesive but with a layer of flame retardant particles, so that lubricant or flame retardant particles compatible with resin are coated between the first reinforcement layer 2 and the slip and fold resistance layer 4.

[0053] The anti-folding layer 4 is preferably made of rubber with excellent elasticity and elongation. When bending, the inner compressed part is absorbed by the elasticity of the rubber, and the outer stretch is absorbed by the elongation of the rubber, thereby improving the anti-bending ability and reducing the bending radius. On the other hand, by taking advantage of the poor bonding performance between the aramid fiber cloth of the first reinforcement layer 2 and the rubber of the anti-folding layer 4, slippage is formed between the anti-folding layer 4 and the aramid fiber cloth of the first reinforcement layer 2, reducing the shear deformation of the rubber of the anti-folding layer 4 and preventing the rubber of the anti-folding layer 4 from rupture, thereby ensuring that in addition to the anti-leakage function of the inner contact layer 1, the rubber of the anti-folding layer 4 is also protected to have an anti-leakage function, thereby forming a multi-layer anti-leakage protection and improving the anti-bending and anti-leakage life of the hose. At the hose connector end, the rubber of the anti-folding layer 4 is compressed and deformed due to buckling, forming a sealing structure similar to an O-ring, thereby ensuring the gap leakage caused by the poor bonding performance between the aramid layer and the rubber of the anti-folding layer 4.

[0054] The anti-pull-out reinforcement layer 5 is made by firstly dipping the outer side of the slip and folding-resistant layer 4 with glue through an extruder, and then winding the high-strength carbon fiber cloth around the outer side of the slip and folding-resistant layer 4 in a certain spiral direction; during the winding process, the high-strength carbon fiber cloth used in the anti-pull-out reinforcement layer 5 is preferably wound around the outer side of the slip and folding-resistant layer 4 in a right-handed spiral direction, so that the carbon fiber cloth can form a forward-rotating follow-up effect during the right-handed thread rotation of the commonly used hose connector, and the carbon fiber cloth is in a contracted state when the forward right-handed direction is consistent with the rubber of the slip and folding-resistant layer 4, so as to prevent the rubber adhesive between the carbon fiber cloth and the rubber of the slip and folding-resistant layer 4 from being torn due to large misalignment. As a result, the inner contact layer 1 has high strength and small deformation, so that the pulsating flow energy of relative slip along the longitudinal direction is not absorbed, and the timely rebound force after the pulsation is beneficial to the lateral expansion energy of the pulsating part absorbed by the nylon of the inner contact layer 1 to be fed back to the pulsating flow group flowing through, thereby feeding the absorbed energy back to the longitudinal pulsation in time, forming a longitudinal pulsation driving force coordinated with the pulsation frequency, and then forming a fluid space channel with pulsating wave velocity flow.

[0055] The structures of the aramid fiber cloth and the carbon fiber cloth are not limited by the present application and may adopt any of the following implementations:

[0056] Embodiment 1: the aramid fiber cloth is wound in a left-hand spiral along the axis direction on the outside of the inner contact layer 1 ; the carbon fiber cloth is wound in a right-hand spiral along the axis direction on the outside of the slip and rubbing anti-folding layer 4 .

[0057] The spiral direction of the aramid fiber cloth is left-handed, which is convenient for the right-handed thread of the commonly used hose connector. During the rotation, the aramid cloth forms a reverse rotation expansion effect, driving the outer wall of the nylon tube of the inner contact layer 1 to move toward the slip and fold anti-layer 4, playing a compression enhancement role, preventing the aramid yarn or the aramid fiber cloth from separating from the slip and fold anti-layer 4.

[0058] The high-strength carbon fiber cloth used in the anti-pullout reinforcement layer 5 is preferably in a certain spiral direction, which is consistent with the right-hand direction of the conventional hose joint, so as to adapt to the right-hand thread mostly used in conventional hose joints. During the rotation of the right-hand thread, the high-strength carbon fiber cloth used in the anti-pullout reinforcement layer 5 drives the sliding and folding anti-layer 4 to form a rotation follow-up effect. The high-strength carbon fiber cloth used in the anti-pullout reinforcement layer 5 has a convergence movement during the forward rotation process, thereby preventing the rubber adhesive between the sliding and folding anti-layer 4 from being torn due to large misalignment.

[0059] Embodiment 2: the aramid fiber cloth is wound around the outer side of the inner contact layer 1 in a right-hand spiral along the axial direction; the carbon fiber cloth is wound around the outer side of the slip and rubbing anti-folding layer 4 in a left-hand spiral along the axial direction.

[0060] The spiral direction of the aramid fiber cloth is right-handed, which makes it convenient for the aramid cloth to form the same rotational follow-up effect during the rotation of the right-hand thread of the commonly used hose connector. The high-strength carbon fiber cloth used in the anti-pull-out reinforcement layer 5 has a contraction movement during the forward rotation process, thereby avoiding the rubber adhesive between the slip and rubbing anti-folding layer 4 from tearing due to large misalignment, and further improving the bending resistance of the hose.

[0061] The carbon fiber cloth is wound in a left-hand spiral along the axial direction on the outside of the slip and fold anti-layer 4. The carbon fiber cloth is wound in a left-hand spiral along the axial direction to form a reverse rotating expansion effect, which drives the outer wall of the nylon tube of the inner contact layer 1 to move toward the slip and fold anti-layer 4, thereby playing a compression enhancement role and preventing the aramid yarn or aramid fiber cloth from separating from the slip and fold anti-layer 4.

[0062] As a preferred embodiment, the thickness δ of the aramid fiber cloth is balanced according to the inner diameter d of the hose and the withstand pressure P, so that the tensile strength σ of the aramid fiber cloth of the hose under four times the withstand pressure P satisfies 4P*d=σ*2δ.

[0063] As a preferred embodiment, the flame retardant sliding layer 3 includes flame retardant particles coated on the outside of the first reinforcing layer 2, and the bonding strength between the flame retardant particles and nylon or aramid is more than 2 times greater than the bonding strength between the flame retardant particles and the sliding anti-folding layer.

[0064] Flame retardant particles are easy to add to resin, clean and hygienic, have high flame retardant efficiency, small addition amount, little effect on the mechanical properties of resin, and are not prone to stratification, pattern, precipitation and other undesirable phenomena after addition, saving manpower, material cost and time. Generally speaking, the dispersibility, fluidity, compatibility with resin, thermal stability and weather resistance of flame retardant particles in resin are much better than ordinary flame retardants. In addition, the flame retardant efficiency and effectiveness (cost performance) of properly formulated flame retardant particles are also much better than ordinary flame retardants. Therefore, flame retardant particles have become one of the best choices for flame retardant plastic products to achieve fire protection requirements, and have become an effective substitute for flame retardant powder. Flame retardant particles have good compatibility with resin, because in general, flame retardant particles (masterbatch) are specially treated to improve their compatibility with plastic resin, so that even if the amount of flame retardant particles added to the resin is large, it is not easy to cause stratification, frosting, pattern and other problems. However, adding it to the rubber layer can effectively play a stratification role; by adding flame retardant particles, the flammability of the instructor can be reduced. When heated, it can release non-flammable gas, which quickly covers the surface of the material to form a protective layer that isolates oxygen and effectively slows down the spread of flames.

[0065] As a preferred embodiment, the wall thickness of the inner contact layer 1 is calculated based on the ratio of the inner wall thickness of a normal arterial blood vessel to the thickness of the adjacent first reinforcement layer 2 as 3. By analogy, the wall thickness δ1 of the inner contact layer 1 is calculated to be 3 times the thickness δ of the aramid fiber cloth of the hose, that is, δ1=3δ.

[0066] As a preferred embodiment, the inner contact layer 1 is made of nylon material, and the hard core formed by matching and connecting with the first reinforcement layer 2 is used as the inner core and is extruded into a nylon resin tube. The inner wall size precision of the pipeline made of the hard core is high, which is conducive to controlling the matching size precision and the sealing gap control. Among them, the extruded inner core preferably uses a hard core made of metal material to improve the inner diameter precision of the inner contact layer.

[0067] The inner contact layer 1 is made of nylon material, and the hard core formed by matching the size of the first reinforcement layer 2 is used as the inner core and extruded to form a nylon resin tube. Not only does it ensure that the inner wall of the nylon resin tube is as smooth as a mirror, it neither pollutes the medium nor is polluted by the medium; it also has smaller power transmission loss, higher efficiency, and precise matching size, so it is more conducive to the close matching of other hoses and the control of the sealing gap.

[0068] As a preferred embodiment, according to the ratio of the inner wall thickness of a normal arterial blood vessel to the thickness of the adjacent first reinforcement layer being 3, the wall thickness δ1 of the inner contact layer is calculated by analogy to be 3 times the thickness δ of the aramid fiber cloth of the hose, that is, δ1=3δ.

[0069] As a preferred implementation, according to the allowable compression rate of the sealing rubber ranging from 10% to 43%, the variation range of the sliding anti-folding layer is calculated to be δ3=10%*δ2~43%*δ2.

[0070] The permissible compression rate of 43% is the maximum permissible compression rate, and the variation of the sliding anti-folding layer 4 calculated therefrom is used as one of the reference bases for calculating the minimum theoretically permissible bending radius.

[0071] As a preferred embodiment, the maximum radial expansion rate of the first reinforcement layer 2 is not greater than 2%, and the maximum radial deformation of the inner diameter of the hose is obtained as δ4=2%*δ1.

[0072] The smaller the thickness δ of the aramid fiber cloth, the greater the tensile strength σ of the corresponding aramid fiber cloth, the smaller δ1=3δ, and the smaller the deformation δ4=2%*δ1=6%*δ. This setting will be closer to the rigid deformation of the rigid steel pipe, thus having the characteristics of a quasi-rigid pipeline. Ensure that the inner contact layer 1 has high strength and small deformation, so that the pulsating flow energy of relative slip along the longitudinal direction is not absorbed, and the timely rebound force after the pulsation is conducive to the lateral expansion energy of the pulsating part absorbed by the nylon of the inner contact layer 1 to feed back to the pulsating flow group flowing through, thereby feeding back the absorbed energy to the longitudinal pulsation in time, forming a longitudinal pulsation driving force coordinated with the pulsation frequency, and then forming a fluid space channel with pulsating wave velocity flow.

[0073] As a preferred embodiment, the weather-proof layer 6 uses weather-proof rubber as the extrusion molding material; or, the weather-proof layer 6 uses a spiral plastic sheath to form a protective layer; or, the weather-proof layer 6 is prepared with a steel wire sheath to form a protective layer; or, the weather-proof layer 6 uses a protective coating to be sprayed on the outside of the anti-pull-out reinforcement layer to form a protective layer.

[0074] The weather-resistant layer adopts a polyurethane outer lining, and the outer side of the polyurethane outer lining is coated with an anti-ultraviolet paint or covered with an anti-ultraviolet material; the weather-resistant layer connected to the outer side of the slip and fold anti-layer 4 has anti-wear and abrasion resistance characteristics.

[0075] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0076] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0077] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An anti-bending hose imitating an artery, characterized in that: include: An inner contact layer, a first reinforcement layer, a flame retardant and rubbing layer, a rubbing and folding-resistant layer, an anti-pull-out reinforcement layer and a weatherproof layer are sequentially arranged from the inside to the outside in the radial direction; the first reinforcement layer is wound around the outside of the inner contact layer by means of aramid fiber cloth, the flame retardant and rubbing layer is coated on the outside of the first reinforcement layer, the rubbing and folding-resistant layer is connected to the outside of the flame retardant and rubbing layer by means of extrusion molding, the anti-pull-out reinforcement layer is connected to the outside of the rubbing and folding-resistant layer by means of carbon fiber cloth winding, and the weatherproof layer is molded outside the anti-pull-out reinforcement layer; The inner contact layer is configured as a hard and smooth nylon layer, which reduces the friction loss of the pipe wall to the oil and the absorption and consumption of the pulsation energy by the pipeline; at the same time, the setting of the thickness of the nylon layer ensures that after the pulsation radial expansion energy flowing through is absorbed, the expansion energy is fed back to the pulsation flow group flowing through in time through the resilience of the hard wall, so as to form a longitudinal pulsation auxiliary driving force, so that a quasi-rigid fluid space smooth channel is formed inside the inner contact layer; The slip and fold resistance layer is configured as thicker rubber, and the bonding force between the flame-retardant slip and fold resistance layer and the resin tube is smaller than the bonding force between the flame-retardant slip and fold resistance layer and the resin tube. This flexible bonding length improves the bending resistance of the rubber tube and enhances the pull-off resistance of the resin tube.

2. The anti-bending rubber hose imitating an artery according to claim 1, characterized in that: The aramid fiber cloth is wound in a left-hand spiral along the axis direction on the outside of the inner contact layer; the carbon fiber cloth is wound in a right-hand spiral along the axis direction on the outside of the slip and fold resistance layer; or, The aramid fiber cloth is wound around the outer side of the inner contact layer in a right-hand spiral along the axial direction; and the carbon fiber cloth is wound around the outer side of the slip and rubbing anti-folding layer in a left-hand spiral along the axial direction.

3. The anti-bending rubber hose imitating an artery according to claim 1, characterized in that: The thickness δ of the aramid fiber cloth is calculated and balanced according to the inner diameter d of the hose and the withstand pressure P, so that the tensile strength σ of the aramid fiber cloth of the hose under four times the withstand pressure P satisfies 4P*d=σ*2δ.

4. The anti-bending rubber hose imitating an artery according to claim 1, characterized in that: The flame retardant and slip-resistant layer includes flame retardant particles coated on the outside of the first reinforcing layer, and the bonding strength between the flame retardant particles and nylon or aramid is more than twice the bonding strength between the flame retardant particles and the slip-resistant and anti-folding layer.

5. The anti-bending rubber hose imitating an artery according to claim 1, characterized in that: The inner contact layer is made of nylon material and cooperates with the first reinforcement layer to be extruded into a nylon resin tube.

6. The anti-bending rubber hose imitating an artery according to claim 5, characterized in that: According to the ratio of the thickness of the inner wall of a normal artery to the thickness of the adjacent first reinforcement layer being 3, the wall thickness δ1 of the inner contact layer is calculated by analogy to be 3 times the thickness δ of the aramid fiber cloth of the hose, that is, δ1=3δ.

7. The anti-bending rubber hose imitating an artery according to claim 6, characterized in that: According to the ratio of the wall thickness of the thickened layer to the wall thickness of the inner wall of a normal arterial blood vessel being 5, the thickness range of the slip and fold resistance layer is calculated to be δ2=5δ1=15δ.

8. The anti-bending rubber hose imitating an artery according to claim 7, characterized in that: According to the allowable compression rate of the sealing rubber in the range of 10%-43%, the variation range of the sliding anti-folding layer is calculated to be δ3=10%*δ2~43%*δ2.

9. The anti-bending rubber hose imitating an artery according to claim 6, characterized in that: The maximum radial expansion and contraction rate of the first reinforcement layer is not greater than 2%, and the maximum radial deformation of the inner diameter of the hose is obtained by δ4=2%*δ1.

10. The anti-bending rubber hose imitating an artery according to claim 1, characterized in that: The weatherproof layer uses weatherproof rubber as the extrusion molding material; or, the weatherproof layer uses a spiral plastic sheath to form a protective layer; or, the weatherproof layer is prepared with a steel wire sheath to form a protective layer; or, the weatherproof layer uses a protective coating that is sprayed on the outside of the anti-pull-out reinforcement layer to form a protective layer.

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