CN104405970A - Bionic hydraulic pipe - Google Patents

Abstract

A bionic hydraulic pipe, the hydraulic pipe is a four-layer circular pipe, which consists of an inner layer, a middle layer A, a middle layer B, and an outer layer in the radial direction from the inside to the outside, and the two adjacent layers are bonded to each other; the inner layer It is a nitrile rubber tube; the middle layer A is a braided mesh tube woven with warp and weft threads; the middle layer B is a steel wire mesh tube; the outer layer is a rubber tube. The invention greatly reduces the phenomenon of turbulent flow in the pipeline, thereby reducing the fluid-solid coupling vibration of the hydraulic pipeline; the effect of absorbing flow pulsation and vibration is stronger, and the anti-seismic effect is better.

Description

A bionic hydraulic tube

Technical field The present invention relates to a hydraulic pipe of a hydraulic pipeline, especially a hydraulic pipe used at the outlet of a main pump of a high-pressure hydraulic system and at the connection of an actuator.

Background technology At present, with the development of hydraulic systems in the direction of high speed and high pressure, the problem of hydraulic system vibration is becoming more and more serious, and the failure rate and failure rate are also greatly increased, which has become the main bottleneck restricting its development in the direction of high speed and high pressure. one. The axial piston pump is the heart of the hydraulic system. The flow pulsation at the pump outlet is one of the main sources of vibration in the hydraulic system, and it propagates through the pipeline, causing strong vibration in the downstream system. Absorbing the flow pulsation at the pump port is one of the ways to reduce the vibration of the hydraulic system. However, the vibration control effect of absorbing the flow pulsation is more direct and effective than controlling the vibration after the flow pulsation excites the fluid-solid coupling vibration. Therefore, the pump port pipeline can reduce the pulsation of the pump. It plays a vital role. For example, installing a shock absorbing throat is an effective measure to eliminate vibration at the main pump outlet of most high-pressure hydraulic systems. This method reduces the harm caused by the flow pulsation at the pump port to a certain extent. A hydraulic hose that integrates multiple layers of steel wire inside. The rubber material and the elastic properties of the steel wire can better absorb vibration energy. In addition, when the hydraulic system is disturbed by external loads during the working process, forced vibration will be formed in the actuators such as hydraulic cylinders and hydraulic motors, and then strong vibrations will be formed in the pipeline system. Install hydraulic hoses and pipelines at the high-pressure ports of the actuators Shock absorbers are a common measure to reduce this part of the vibration. Since the material and structure of the existing hydraulic hoses are "cross-mixed weaving of rigid materials and elastic materials", they mainly rely on elastic materials for vibration reduction. Due to the limitation of structural strength, the rigidity of elastic materials is relatively large, and the ability to absorb pulsations and vibrations is limited. Road shock absorbers are generally wrapped on the outer surface of steel pipes or high-strength rubber hoses, and their materials and structures are "rigid materials inside, elastic materials outside". Instead of directly absorbing flow pulsations, the vibration control effect is limited.

At present, the steel wire braided hose widely used in hydraulic systems is composed of an inner rubber layer, a middle rubber layer, one to four steel wire braided reinforcement layers and an outer rubber layer. The more layers of steel wire winding layers, the smaller the diameter of the hose. The higher the pressure resistance. Existing designs, for example: Chinese invention patent CN1786541A discloses a pressure-resistant silicone rubber hose. The main material of the inner rubber layer and the outer rubber layer is silicone rubber. Good pressure rubber hose, but the inner diameter of the hose is small, and it is only suitable for applications in the food and pharmaceutical industries. Chinese patent CN1995791A discloses a new type of silicone rubber hose, which is reinforced with a stainless steel ring to enhance the strength of the hose. However, the elasticity of the hose is thus suppressed and the absorption of pulsation is poor. The US patent US4285534 discloses a hose that absorbs pulsations. Throttle materials are arranged at both ends of the hose, and a throttling device is arranged in the tube, so that the flow pulsation is suppressed, but energy will be generated when the fluid passes through the throttling port. loss, affecting efficiency.

SUMMARY OF THE INVENTION The purpose of the present invention is to provide a bionic hydraulic tube that is made of the cheetah heart exit vessel structure, which can withstand high pressure and absorb flow pulsation.

Concrete technical scheme of the present invention is as follows:

A bionic hydraulic pipe, the hydraulic pipe is a four-layer circular pipe, which consists of an inner layer, a middle layer A, a middle layer B, and an outer layer in the radial direction from the inside to the outside, and the adjacent two layers are bonded to each other; the inner layer It is a nitrile rubber tube; the middle layer A is a braided mesh tube woven into warp and weft, and it surrounds the warp on the weft line perpendicular to the center line and the center line in the same plane; the middle layer B is a steel wire mesh tube; The outer layer is a rubber tube. The braided mesh pipe of the middle layer A is made of satin weave with warp and weft threads, wherein the warp thread is polyester thread and the weft thread is polyurethane thread; the steel wire mesh pipe of the middle layer B is made of stainless steel wire or aluminum wire mesh. Alloy steel wire or titanium alloy steel wire; the steel wire mesh pipe in the middle layer B above can be 1 layer of steel wire mesh, or 1-4 layers of steel wire mesh woven from the inside out. The outer layer wrapped around the steel wire mesh tube of the middle layer B is a rubber protective layer; or a common rigid hydraulic pipeline replacing the middle layer B and the rubber protective layer is provided outside the middle layer A, such as stainless steel alloy, aluminum alloy, and titanium alloy pipelines. In addition, each layer of the present invention is bonded by glue with a certain degree of viscoelasticity, so that each layer becomes a whole and has better overall performance.

The hydraulic pipe body of the present invention may have an outer diameter of 8 mm to 70 mm and a thickness of 2 mm to 10 mm. The selection of the hose can be selected according to the selection method of the general hose.

It only takes 4 seconds for a cheetah to go from a standstill to a speed of 70 kilometers per hour in an instant. During this process, the cheetah's heart outlet vessels are subjected to high-frequency and high-pressure blood flow pressure pulsations. The reason why the outlet vessels of the cheetah heart can withstand high frequency and high pressure blood flow and pressure pulsation is because the outlet vessels of the cheetah heart are composed of three layers: intima, media and adventitia. The intima is composed of endothelium, subendothelium, and internal elastic lamina. The subendothelial layer is thicker, which contains collagen fibers, elastic fibers and a small amount of smooth muscle, and the activities of each cell are innervated by external nerves or affected by hormones diffused to each cell. The inner elastic membrane is bonded to the elastic membrane of the media. The media has 40 to 70 layers of elastic membranes. Each layer of elastic membrane is connected by elastic fibers, and there are circular smooth muscle, a small amount of collagen fibers and elastic fibers between the elastic membranes. The adventitia is relatively thin and consists of connective tissue, mostly collagen fibers with a few elastic fibers. The study found that it is precisely because of this structure of blood vessels that when a cheetah is exercising vigorously, although the blood pressure in the body suddenly rises, the amplitude and frequency of the pulsation increase rapidly, but due to the smoothness of the intima and the good viscoelasticity of the middle layer, the blood During the flow process, the resistance along the way is small, and the ability to absorb pulsations is strong. At the same time, when the blood vessels expand and the blood pressure rises rapidly, the collagen fibers generate great tension to hinder the further expansion of the blood vessels, so that the blood vessels can not be affected by a sudden increase in pressure. rupture. Therefore, the inner layer of the bionic hydraulic pipe of the present invention, which is made in imitation of the cheetah heart outlet blood vessel structure, is made of nitrile rubber (NBR) material that is easy to process into a smooth surface, which can make the inner wall of the layer have higher smoothness and reduce the pressure of hydraulic oil when it flows through. At the same time, it reduces the generation of turbulence and reduces the possibility of turbulence-induced vibration; the middle layer A is an elastic absorption pulsation layer woven by warp and weft, which can absorb the flow pulsation in the pipeline to a large extent. The warp thread is made of polyester material, which has the advantages of high strength and strong resilience, and can resist the deformation of the inner wall of the pipeline in a large range. The weft thread is made of polyurethane material. The advantage of polyurethane is that it has strong elasticity and can effectively absorb flow pulsation. The above warp and weft threads are woven together to ensure that the middle layer A has sufficient resilience and high pulsation absorption performance; the middle layer B and the outer layer are made of steel wire and rubber material respectively, and the steel wire is wrapped by rubber, which is similar to the traditional hydraulic hose, making the rubber soft. The tube has sufficient strength, and the steel wire will not be exposed to the air to avoid corrosion.

Compared with the prior art, the present invention has the following advantages:

1. The turbulent flow phenomenon in the pipeline is greatly reduced, and the fluid-solid coupling vibration of the hydraulic pipeline caused by it is reduced;

2. The effect of absorbing flow pulsation and vibration is stronger, and it has better anti-seismic effect;

3. The middle layer A and the inner layer of the present invention can also be integrated separately, and embedded in the inner wall of the rigid hydraulic pipeline, which has a better ability to absorb pulsation than traditional rigid hydraulic pipelines.

Description of drawings

Fig. 1 is a schematic diagram of the three-dimensional structure of the present invention.

Fig. 2 is a schematic cross-sectional front view of the present invention.

Fig. 3 is a schematic diagram of the axial section of the middle layer A of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the schematic diagrams of bionic hydraulic pipes shown in Figure 1, Figure 2 and Figure 3, the hydraulic pipe is a four-layer circular pipe, which is the inner layer 1, middle layer A2, The middle layer B3 and the outer layer 4, and the adjacent two layers are bonded to each other; the inner layer is a nitrile rubber tube, and the middle layer A is a braided mesh tube made of a satin weave by warp 2.1 and weft 2.2, wherein the warp It is polyester, and its weft thread is polyurethane; the inner layer and the middle layer A are bonded together by nitrile rubber glue; The outer layer is a rubber tube, and the middle layer B and the outer layer are bonded together by a rubber adhesive A (hexamethoxymethylpyrimidin).

Claims (6)

1. a bionic type hydraulic tube, is characterized in that: this hydraulic tube is the pipe of four layers, and it is radially followed successively by internal layer, middle level A, middle level B and skin from inside to outside, and adjacent two layers is mutually bonding; Wherein internal layer is nitrile butadiene rubber pipe; Described middle level A is the braiding webmaster become with weft knit by warp; Described middle level B is steel wire network pipe; Described skin is rubber pipe.

2. bionic type hydraulic tube according to claim 1, is characterized in that: the braiding webmaster of described middle level A, and its warp is terylene, and its parallel is polyurethane.

3. bionic type hydraulic tube according to claim 2, is characterized in that: the braiding webmaster of described middle level A is the braiding webmaster taking satin weave mode to make by warp and parallel.

4. bionic type hydraulic tube according to claim 1, is characterized in that: the steel wire network pipe of described middle level B is 1 ~ 4 layer of steel wire be woven into from inside to outside.

5. bionic type hydraulic tube according to claim 1, is characterized in that: the steel wire network pipe of described middle level B, and its steel wire is stainless steel steel wire or aluminum alloy steel wire or titanium alloy steel wire.

6. bionic type hydraulic tube according to claim 1, is characterized in that: outside the A of middle level, be provided with common rigidity hydraulic pipe line.