Rubber tube

Abstract

The utility model discloses a rubber tube which comprises a lining layer, a first reinforcing layer, a middle rubber layer, a second reinforcing layer and an outer coating layer which are sequentially arranged from inside to outside along the radial direction of the rubber tube, wherein the first reinforcing layer is an aramid fiber braid layer, and the second reinforcing layer is a steel wire braid layer; or, the first reinforcing layer is a steel wire woven layer, and the second reinforcing layer is an aramid fiber woven layer. On the premise that the pressure requirement of the rubber pipe is met, the flexibility of the rubber pipe is doubled, and therefore the installation requirement of hydraulic pipelines in some small spaces is met.

Description

Technical Field

[0001] This utility model relates to the field of mechanical engineering technology, and in particular to a rubber hose. Background Technology

[0002] With the increasing demands for lightweight construction machinery, the space available for hydraulic system piping is shrinking. This necessitates hydraulic hoses with better flexibility and a smaller bending radius, as well as lower weight per meter. Currently, double-braided hydraulic hoses use two layers of copper-plated steel wire braid as reinforcement to meet certain pressure requirements. However, the high hardness of steel wire limits the hose's flexibility, resulting in a relatively large bending radius that cannot meet the installation requirements of hydraulic lines in confined spaces or the overall lightweight design of equipment. To maximize the flexibility of double-braided hydraulic hoses, a lower-hardness inner layer is often used, or the braiding structure of the steel wire is altered. However, simply reducing hose hardness, increasing rubber elasticity, and changing the structure of the steel wire braid sometimes fails to meet these stringent requirements. Utility Model Content

[0003] The purpose of this invention is to solve the problem of how to further improve the flexibility of a hose while meeting the pressure requirements, thus satisfying the installation requirements of hydraulic pipelines in confined spaces. This invention provides a hose that doubles the flexibility while meeting the pressure requirements, thereby satisfying the installation requirements of hydraulic pipelines in confined spaces.

[0004] To solve the above-mentioned technical problems, the present invention discloses a rubber hose, comprising: an inner lining layer, a first reinforcing layer, a middle rubber layer, a second reinforcing layer and an outer covering layer arranged sequentially from the inside to the outside along the radial direction of the rubber hose; wherein, the first reinforcing layer is an aramid braided layer and the second reinforcing layer is a steel wire braided layer; or, the first reinforcing layer is a steel wire braided layer and the second reinforcing layer is an aramid braided layer.

[0005] Using the above technical solution, aramid is a synthetic long-chain polymer fiber with characteristics of high strength, high modulus, low elongation, and high-temperature stability. It possesses both high strength and good flexibility. Using an aramid braided layer as one of the reinforcing layers, in conjunction with a steel wire braided layer as another reinforcing layer, the two together serve as the pressure-bearing layer of the hose. Compared to embodiments where both reinforcing layers use aramid braided layers, this embodiment can simultaneously ensure the hose's stiffness and negative pressure resistance requirements. Compared to embodiments where both reinforcing layers use steel wire braided layers, this embodiment can double the hose's flexibility while ensuring the hose's strength and pressure requirements, thereby meeting the installation requirements of hydraulic pipelines in confined spaces.

[0006] In addition, the weight of the aramid braided layer is much lower than that of the steel wire braided layer. Compared with the embodiment where both reinforcing layers are steel wire braided layers, the use of the aramid braided layer as one of the reinforcing layers in this application can reduce the weight of the hose, thereby meeting the overall lightweight requirements of the equipment.

[0007] In some possible implementations, the inner liner, the first reinforcing layer, the middle adhesive layer, the second reinforcing layer, and the outer cover are bonded together in sequence.

[0008] In some possible implementations, when the first reinforcing layer is an aramid braided layer, the aramid braided layer covers 85% to 95% of the liner layer, and a portion of the liner layer is exposed from the aramid braided layer to bond with the middle adhesive layer.

[0009] Using the above technical solution, the aramid braided layer, serving as the first reinforcing layer, is woven onto the inner liner layer. The woven aramid braided layer has gaps through which the inner liner layer is exposed and faces the middle rubber layer, thus bonding with it. Simultaneously, the upper and lower surfaces of the portion of the aramid braided layer covering the inner liner layer are bonded to both the middle rubber layer and the inner liner layer, resulting in stronger adhesion between the middle rubber layer, the inner liner layer, and the aramid braided layer of the hose.

[0010] In some possible implementations, when the second reinforcing layer is an aramid braided layer, the aramid braided layer covers 85% to 95% of the middle adhesive layer, and a portion of the middle adhesive layer is exposed to the aramid braided layer for bonding with the outer cover layer.

[0011] Using the above technical solution, the aramid braided layer, serving as the second reinforcing layer, is woven onto the intermediate rubber layer. The woven aramid braided layer has gaps through which the intermediate rubber layer is exposed and faces the outer covering layer, thus bonding with it. Simultaneously, the upper and lower surfaces of the portion of the aramid braided layer covering the intermediate rubber layer are bonded to both the outer covering layer and the intermediate rubber layer, resulting in stronger adhesion between the intermediate rubber layer, the outer covering layer, and the aramid braided layer of the tubing.

[0012] In some possible implementations, the aramid braided layer is made of para-aramid; the steel wire braided layer is made of copper-plated steel wire.

[0013] Using the above technical solution, para-aramid has better strength than other aramids, which can ensure the strength requirements of the hose.

[0014] When the second reinforcing layer is a steel wire braided layer, the sulfur in the rubber of the middle rubber layer and the outer coating layer reacts chemically with the copper on the surface of the copper-plated steel wire to generate compounds such as cuprous sulfide (Cu2S). Cuprous sulfide can form chemical bonds between the rubber and the steel wire, significantly improving the bonding force between them. This chemical bonding is much stronger than simple physical adsorption, allowing the rubber to adhere firmly to the steel wire surface. This makes the bond between the steel wire braided layer and the middle rubber layer and the outer coating layer stronger, improving the overall performance of the hose.

[0015] When the first reinforcing layer is a steel wire braided layer, the sulfur in the rubber of the middle rubber layer and the inner lining layer reacts chemically with the copper on the surface of the copper-plated steel wire to generate compounds such as cuprous sulfide (Cu2S). Cuprous sulfide can form chemical bonds between the rubber and the steel wire, significantly improving the bonding force between them. This chemical bonding is much stronger than simple physical adsorption, allowing the rubber to adhere firmly to the steel wire surface. This makes the bond between the steel wire braided layer and the middle rubber layer and the inner lining layer stronger, improving the overall performance of the hose.

[0016] In some possible implementations, the density of the para-aramid is 1.43 g / cm³. 3 ~1.45g / cm 3 The tensile strength is 2900 MPa to 3500 MPa, and the elongation after fracture is 1.5% to 2.5%.

[0017] In some possible implementations, the para-aramid is subjected to resorcinol-formaldehyde-latex impregnation treatment.

[0018] By employing the above technical solution, impregnating para-aramid with rubber can form a film on the surface of para-aramid, significantly improving its bonding strength with rubber materials, enabling the two to work together better and fully leveraging the reinforcing effect of para-aramid.

[0019] In some possible implementations, the steel wire braid layer covers 90% to 100% of the inner lining layer or the middle rubber layer.

[0020] By adopting the above technical solution, the coverage rate of the steel wire braided layer over the inner lining layer or the middle rubber layer is guaranteed to be more than 90%, so as to achieve better strength of the hose and meet the pressure requirements of the product.

[0021] In some possible implementations, the weave angle of the first reinforcing layer is 53.7° to 54.7°, and the weave angle of the second reinforcing layer is 54.7° to 55.7°.

[0022] Using the above technical solution, 54.7° is considered a theoretically optimal balance angle in the braided reinforcement layer design of the hose. When the hose is subjected to internal pressure, at this angle, the axial and circumferential stresses of the hose can achieve a better balance, thus giving the hose a stronger load-bearing capacity, reducing damage caused by local stress concentration, and extending the service life of the hose. By setting the braiding angles of both the first and second reinforcement layers slightly offset from the equilibrium angle of 54.7°, and placing the braiding angles of the first and second reinforcement layers on opposite sides of the equilibrium angle, when the hose is subjected to internal pressure, the first and second reinforcement layers can work together to make the stress distribution more uniform, sharing the load, thereby improving the overall load-bearing capacity of the hose, reducing damage caused by local stress concentration, and extending the service life of the hose.

[0023] In some possible implementations, the inner liner is made of nitrile rubber or neoprene rubber, the outer liner is made of neoprene rubber, and the middle rubber layer is a mixture of adhesive, neoprene rubber, and nitrile rubber.

[0024] Using the above technical solution, the inner lining layer is made of nitrile rubber or neoprene rubber, which can meet the oil resistance, temperature resistance, and sealing requirements of the hose. The outer lining layer is made of neoprene rubber, which has the characteristics of aging resistance, ozone resistance, and temperature resistance, and can protect the second reinforcing layer. The middle rubber layer acts as an adhesive between the aramid braided layer and the steel wire braided layer, and buffers the friction between the two layers when the hose is under stress. Attached Figure Description

[0025] Figure 1 A schematic diagram of the structure of the hose according to an embodiment of the present invention is shown. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0027] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0029] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0030] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0032] refer to Figure 1 This application provides a hose 100. Along the radial direction X of the hose 100, the hose 100 includes, from the inside out, an inner liner 200, a first reinforcing layer 300, a middle rubber layer 400, a second reinforcing layer 500, and an outer cover layer 600. The first reinforcing layer 300 is an aramid braided layer, and the second reinforcing layer 500 is a steel wire braided layer; or, the first reinforcing layer 300 is a steel wire braided layer, and the second reinforcing layer 500 is an aramid braided layer. That is, the hose 100 of this embodiment has two reinforcing layers, namely a steel wire braided layer and an aramid braided layer. Regarding which is the first reinforcing layer 300 and which is the second reinforcing layer 500, there are two embodiments: either the first reinforcing layer 300 is an aramid braided layer and the second reinforcing layer 500 is a steel wire braided layer; or, the first reinforcing layer 300 is a steel wire braided layer and the second reinforcing layer 500 is an aramid braided layer.

[0033] Using the above technical solution, aramid is a synthetic long-chain polymer fiber with characteristics of high strength, high modulus, low elongation, and high-temperature stability. It has high strength and good flexibility. Using an aramid braided layer as one of the reinforcing layers, in conjunction with a steel wire braided layer as another reinforcing layer, the two together serve as the pressure-bearing layer of the hose 100. Compared to embodiments where both reinforcing layers use aramid braided layers, this embodiment can simultaneously ensure the stiffness and negative pressure resistance requirements of the hose 100. Compared to embodiments where both reinforcing layers use steel wire braided layers, this embodiment can double the flexibility of the hose 100 while ensuring its strength and pressure requirements, thereby meeting the installation requirements of hydraulic pipelines in some confined spaces.

[0034] In addition, the weight of the aramid braided layer is much lower than that of the steel wire braided layer. Compared with the embodiment where both reinforcing layers are steel wire braided layers, the use of the aramid braided layer as one of the reinforcing layers in this application can reduce the weight of the hose 100, thereby meeting the overall lightweight requirements of the equipment.

[0035] It should be noted that, Figure 1 To facilitate the visualization of the various layers of the tubing 100, the layers, which were originally hidden internally, are visually revealed through a truncated design. This allows for a clear view of the relative positions of the inner liner 200, the first reinforcing layer 300, the middle rubber layer 400, the second reinforcing layer 500, and the outer covering layer 600. However, it is understood that the actual tubing 100 is a continuous whole, with each layer forming a complete cylindrical structure around the axis of the tubing 100, extending from one end of the tubing 100 to the other.

[0036] In some possible implementations, the inner liner 200, the first reinforcing layer 300, the middle adhesive layer 400, the second reinforcing layer 500, and the outer cover layer 600 are bonded together in sequence.

[0037] In some possible implementations, when the first reinforcing layer 300 is an aramid braided layer, the aramid braided layer covers 85% to 95% of the inner liner layer 200, and a portion of the inner liner layer 200 is exposed to bond with the middle adhesive layer 400. Exemplarily, the coverage of the aramid braided layer on the inner liner layer 200 is, for example, 85%, 87%, 89%, 91%, 93%, 95%, etc.

[0038] In this embodiment, the aramid braided layer is woven onto the inner liner 200. The woven aramid braided layer has gaps through which the inner liner 200 is exposed and faces the middle rubber layer 400, thus bonding with the middle rubber layer 400. Simultaneously, the upper and lower surfaces of the portion of the aramid braided layer covering the inner liner 200 are bonded to both the middle rubber layer 400 and the inner liner 200, thereby strengthening the adhesion between the middle rubber layer 400, the inner liner 200, and the aramid braided layer of the tubing 100.

[0039] In another embodiment, when the second reinforcing layer 500 is an aramid braided layer, the aramid braided layer covers 85% to 95% of the middle adhesive layer 400, and a portion of the middle adhesive layer 400 is exposed to bond with the outer cover layer 600. Exemplarily, the coverage of the aramid braided layer on the middle adhesive layer 400 is, for example, 85%, 87%, 89%, 91%, 93%, 95%, etc.

[0040] In this embodiment, the aramid braided layer is woven onto the middle rubber layer 400. The woven aramid braided layer has gaps through which the middle rubber layer 400 is exposed and faces the outer cover layer 600, thus bonding with the outer cover layer 600. Simultaneously, the upper and lower surfaces of the portion of the aramid braided layer covering the middle rubber layer 400 are bonded to both the outer cover layer 600 and the middle rubber layer 400, thereby strengthening the adhesion between the middle rubber layer 400, the outer cover layer 600, and the aramid braided layer of the tubing 100.

[0041] In this embodiment, the inner liner 200 is made of nitrile rubber or neoprene rubber, which can meet the oil resistance, temperature resistance and sealing requirements of the hose 100.

[0042] The outer layer 600 is made of neoprene rubber. For example, the outer layer 600 mainly serves to protect the second reinforcing layer 500, and it has the characteristics of aging resistance, ozone resistance, and temperature resistance.

[0043] Those skilled in the art will understand that in other embodiments, the inner liner 200 and the outer cover 600 may also be made of other materials, such as styrene-butadiene rubber for the inner liner 200 and chlorinated polyethylene rubber for the outer cover 600.

[0044] In this embodiment, the aramid braided layer is made of para-aramid. For example, para-aramid has better strength than other aramids, which can ensure the strength requirements of the hose 100.

[0045] Specifically, the chemical name of para-aramid is poly(p-phenylene terephthalamide), and the molecular structural formula of para-aramid is:

[0046]

[0047] In this embodiment, the para-aramid is impregnated with resorcinol-formaldehyde-latex (RFL) to form a film on the surface of the para-aramid, which significantly improves its bonding strength with the rubber material, enabling the two to work together better and fully exert the reinforcing effect of the para-aramid.

[0048] The density of para-aramid is 1.43 g / cm³.3 ~1.45g / cm 3 This meets the lightweight requirement of hose 100. The tensile strength of para-aramid is 2900 MPa to 3500 MPa, enabling it to withstand significant tensile forces without failure. The elongation after fracture of para-aramid is 1.5% to 2.5%, ensuring that hose 100 does not undergo significant elastic deformation under stress, thus maintaining the structural stability of hose 100. Specifically, the density of para-aramid can be selected as 1.43 g / cm³. 3 1.44 g / cm 3 1.45g / cm 3 The tensile strength can be selected from 2900 MPa, 3200 MPa, 3500 MPa, etc., and the elongation after fracture can be selected from 1.5%, 2.0%, 2.5%, etc.

[0049] The coverage rate of the steel wire braided layer over the inner lining layer 200 or the intermediate rubber layer 400 is 90% to 100%. That is, when the first reinforcing layer 300 is a steel wire braided layer, the coverage rate of the steel wire braided layer over the inner lining layer 200 is 90% to 100%, specifically, for example, the coverage rate of the steel wire braided layer over the inner lining layer 200 is 90%, 92%, 94%, 96%, 98%, 100%, etc. Correspondingly, when the second reinforcing layer 500 is a steel wire braided layer, the coverage rate of the steel wire braided layer over the intermediate rubber layer 400 is 90% to 100%, for example, 90%, 92%, 94%, 96%, 98%, 100%, etc.

[0050] The specific coverage ratio can be adjusted within this range based on product demand pressure.

[0051] Because steel wire and rubber have good adhesion, there is no need to consider increasing adhesion by reducing the coverage, as is the case with aramid braided layers.

[0052] In this embodiment, the middle rubber layer 400 is a compound of adhesive, neoprene rubber, and nitrile rubber. Exemplarily, the middle rubber layer 400 acts as an adhesive between the aramid braided layer and the steel wire braided layer, and buffers the friction between the two layers when the tubing 100 is under stress.

[0053] In this embodiment, the material of the steel wire braided layer is copper-plated steel wire. Exemplarily, when the second reinforcing layer 500 is a steel wire braided layer, the sulfur in the rubber of the middle rubber layer 400 and the outer coating layer 600 will chemically react with the copper on the surface of the copper-plated steel wire to generate compounds such as cuprous sulfide (Cu2S). Cuprous sulfide can form chemical bonds between the rubber and the steel wire, thereby significantly improving the bonding force between them. This chemical bonding is much stronger than simple physical adsorption, allowing the rubber to firmly adhere to the surface of the steel wire. This makes the bond between the steel wire braided layer and the middle rubber layer 400 and the outer coating layer 600 stronger, improving the overall performance of the hose 100.

[0054] When the first reinforcing layer 300 is a steel wire braided layer located between the inner lining layer 200 and the middle rubber layer 400, the sulfur in the rubber of the middle rubber layer 400 and the inner lining layer 200 reacts chemically with the copper on the surface of the copper-plated steel wire to generate compounds such as cuprous sulfide (Cu2S). Cuprous sulfide can form chemical bonds between the rubber and the steel wire, significantly improving the bonding force between them. This chemical bonding is much stronger than simple physical adsorption, allowing the rubber to adhere firmly to the surface of the steel wire. This makes the bond between the steel wire braided layer and the middle rubber layer 400 and the inner lining layer 200 stronger, improving the overall performance of the hose.

[0055] In this embodiment, the weaving angle of the first reinforcing layer 300 is 53.7° to 54.7°. For example, the weaving angle of the first reinforcing layer 300 is 53.7°, 53.9°, 54.1°, 54.3°, 54.5°, 54.7°, etc.

[0056] The weaving angle of the second reinforcing layer 500 is 54.7° to 55.7°. For example, the weaving angle of the second reinforcing layer 500 is 54.7°, 54.9°, 55.1°, 55.3°, 55.5°, 55.7°, etc.

[0057] It should be noted that the first reinforcing layer 300 specifically refers to the reinforcing layer between the inner lining layer 200 and the middle rubber layer 400, and the second reinforcing layer 500 specifically refers to the reinforcing layer between the middle rubber layer 400 and the outer covering layer 600. That is, regardless of whether the first reinforcing layer 300 is an aramid braided layer or a steel wire braided layer, its braiding angle is 53.7° to 54.7°. Similarly, regardless of whether the second reinforcing layer 500 is an aramid braided layer or a steel wire braided layer, its braiding angle is 54.7° to 55.7°.

[0058] In the braided reinforcement layer design of hose 100, 54.7° is considered a theoretically balanced angle. When hose 100 is subjected to internal pressure, at this angle, the axial stress and circumferential stress of hose 100 can achieve a better balance, thereby giving hose 100 a strong load-bearing capacity, reducing damage caused by local stress concentration, and extending the service life of hose 100.

[0059] In this embodiment, the braiding angles of the first reinforcing layer 300 and the second reinforcing layer 500 are slightly offset from the balance angle of 54.7°. The braiding angles of the first reinforcing layer 300 and the second reinforcing layer 500 are located on both sides of the balance angle. When the hose 100 is subjected to internal pressure, the first reinforcing layer 300 and the second reinforcing layer 500 can work together to make the stress distribution more uniform and share the load, thereby improving the overall load-bearing capacity of the hose 100, reducing damage caused by local stress concentration, and extending the service life of the hose 100.

[0060] Taking the first reinforcing layer 300 as an aramid braided layer and the second reinforcing layer 500 as a steel wire braided layer as an example, the manufacturing process of the hose 100 in this embodiment is as follows:

[0061] 1. The inner lining layer 200 is formed by rubber extrusion process using nitrile rubber or chloroprene rubber as raw materials.

[0062] 2. Para-aramid fibers impregnated with resorcinol-formaldehyde-latex (RFL) are used to form the first reinforcing layer 300 on the inner lining layer 200 prepared in the first step through a weaving process. The weaving angle is controlled at 53.7°-54.7° and the weaving coverage is controlled at 85%-95%.

[0063] 3. A compound of nitrile rubber and neoprene rubber is used as the middle rubber layer 400. After being calendered into a sheet, the middle rubber layer 400 is wrapped around the first reinforcing layer 300 by a middle rubber wrapping device on a braiding machine.

[0064] 4. Using copper-plated steel wire as raw material, a second reinforcing layer 500 is woven on the middle rubber layer 400 using the rubber hose 100.

[0065] 5. Using chloroprene rubber as the main raw material, a rubber layer is extruded outside the second reinforcing layer 500 through a rubber extrusion process to serve as the outer covering layer 600 of the hose 100.

[0066] 6. Pass the previously prepared semi-finished product through a water-coated cloth and then steam vulcanize it.

[0067] 7. Water-removing cloth.

[0068] 8. Remove the mandrel to obtain 100 tubing.

[0069] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A type of hose, characterized in that, include: Along the radial direction of the hose, from the inside out, are arranged an inner liner, a first reinforcing layer, a middle rubber layer, a second reinforcing layer, and an outer covering layer; wherein, The first reinforcing layer is an aramid braided layer, and the second reinforcing layer is a steel wire braided layer; or, The first reinforcing layer is a steel wire braided layer, and the second reinforcing layer is an aramid braided layer.

2. The hose as described in claim 1, characterized in that, The inner lining, the first reinforcing layer, the middle adhesive layer, the second reinforcing layer, and the outer covering layer are bonded together in sequence.

3. The hose as described in claim 2, characterized in that, When the first reinforcing layer is an aramid braided layer, the aramid braided layer covers 85% to 95% of the inner lining layer, and a portion of the inner lining layer is exposed to the aramid braided layer for bonding with the middle adhesive layer.

4. The hose as described in claim 2, characterized in that, When the second reinforcing layer is an aramid braided layer, the aramid braided layer covers 85% to 95% of the middle adhesive layer, and a portion of the middle adhesive layer is exposed to the aramid braided layer for bonding with the outer cover layer.

5. The hose as described in claim 3 or 4, characterized in that, The aramid braided layer is made of para-aramid; the steel wire braided layer is made of copper-plated steel wire.

6. The hose as described in claim 5, characterized in that, The density of the para-aramid is 1.43 g / cm³. 3 ~1.45g / cm 3 The tensile strength is 2900 MPa to 3500 MPa, and the elongation after fracture is 1.5% to 2.5%.

7. The hose as described in claim 5, characterized in that, The para-aramid fiber is treated with resorcinol-formaldehyde-latex impregnation.

8. The hose as described in claim 2, characterized in that, The steel wire braided layer covers 90% to 100% of the inner lining layer or the middle rubber layer.

9. The hose as described in claim 1, characterized in that, The first reinforcing layer has a weaving angle of 53.7° to 54.7°, and the second reinforcing layer has a weaving angle of 54.7° to 55.7°.

10. The hose as described in claim 2, characterized in that, The inner lining is made of nitrile rubber or neoprene rubber, the outer lining is made of neoprene rubber, and the middle rubber layer is made of adhesive, neoprene rubber and nitrile rubber.

Images