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High pressure rubber hose is one of the main connecting parts in modern industrial equipment and engineering machinery, and it is used more widely in hydraulic system. The high pressure hose is composed of the inner rubber layer, the middle rubber layer, the steel wire (braided/surrounded) strengthening layer, the weather-resistant and wear-resistant outer rubber layer.
The inner adhesive layer has the effect of receiving the pulse pressure of the medium and protecting the steel wire from corrosion. The outer adhesive layer protects the steel wire from damage; The steel wire layer is the reinforcement effect of the skeleton. The structure of the steel wire layer (woven/surrounded) and the number of layers are classified. The pressure accepted by the hydraulic hose is also classified. The steel wire layer is from 1 to 6 layers, and the accepted pressure can reach up to 90MPa, or even higher. Hydraulic hose is suitable for conveying hydraulic fluid, hydraulic oil, fuel oil, smooth oil, emulsion, glycol aqueous solution and water, etc.
The suitable task temperature of the commonly used high pressure hose is: steel wire braided high pressure hose -40℃–+100℃, steel wire around the high pressure hose -40℃–+ 120℃.
Accurate selection of high pressure hose is related to the normal task of the whole hydraulic system, as well as the procurement cost of enterprises. Therefore, in the choice of hydraulic hose should refer to the equipment maintenance manual, focus on the following aspects:
First, according to the equipment condition (temperature) and the condition of the hydraulic medium, choose the appropriate high pressure hose. High pressure hose operating temperature is too high or too low will affect the life and pressure performance of the hose, so to use the hose within its limits, the task temperature is not up to the limit of the system for a long time, should use soft pipe sheath.
Second, according to the pressure of the system, determine the maximum task pressure of the high pressure hose. Each high pressure hose has a maximum task pressure, high pressure hose bursting pressure is 3-4 times of the maximum task pressure, high pressure hose pressure, the higher the price is, so according to the practice pressure of the system, choose the maximum task pressure of high pressure hose, that is, can ensure the normal operation of the system, and save procurement costs. If the system impact pressure frequency is high, the high pressure hose with high pulse life should be selected, and the maximum task pressure of the high pressure hose should be appropriately purchased.
Third, choose the inner diameter of the high pressure hose according to the flow. Too small pipe diameter will increase the flow rate of the medium in the pipe, make the system heat, reduce efficiency, and will occur too large pressure drop, affecting the function of the whole system. Pipe diameter will increase the procurement cost, affect the normal operation of the system, so the hose diameter should be appropriate. When the high pressure hose must be fixed with pipe clip or hose through the steel plate, we should also pay attention to the outer diameter of the hose.
Fourth, when choosing high pressure hose, we should pay attention to the bending radius of high pressure hose. The holding length of the front joint should be subtracted when calculating the bending radius. If the bending radius of the installed hose is too small, it will reduce the pressure bearing performance of the hose and reduce its service life.
Fifth, the selection and purchase of high pressure rubber hose matching components. According to the hydraulic hose installation space structure, reasonable selection of joint type, joint angle and assembly angle of the hose assembly.
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