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Hydraulic hoses are also known as hydraulic hoses, hydraulic hoses, high-pressure hoses, hydraulic hoses, steel wire high-pressure hoses and steel wire braided hoses, which are generally divided into steel wire braided hydraulic hoses and steel wire wound hydraulic hoses.
The hydraulic hose is mainly composed of a liquid-resistant inner rubber layer, a middle rubber layer, 2 or 4 or 6 layers of steel wire winding reinforcement layers and an outer rubber layer. The inner rubber layer has the function of making the conveying medium bear pressure and protecting the steel wire from corrosion, while the outer rubber layer protects the steel wire from damage, and the steel wire layer is a skeleton material for reinforcement.
Medium temperature of hydraulic hose equipment
Oil -40 degrees to 100 degrees; Air -30 degrees to 50 degrees; Water -0 degrees to 80 degrees.
Hydraulic hose medium
Carry out hydraulic power transmission or transmission of high-pressure media such as water, gas and oil to ensure the circulation of liquid and transfer liquid energy.
Hydraulic hose implementation standard
The standards commonly used in domestic and foreign trade of hydraulic hoses include DIN, SAE, ISO and GB/T standards;
The standards of steel wire braided hydraulic hose are: DIN EN 853, SAE J517, GB/T 3683-2011, ISO1436;;
The standards of steel wire wound hydraulic hoses are DIN EN 856, SAE J517, GB/T 10544-2003 and ISO3862.
Hydraulic hose type and specification
4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 32, 34, 40, 42,..........................
Characteristics and uses of hydraulic hoses
Characteristics of hydraulic hose
1. The rubber hose is made of special synthetic rubber, which has excellent oil resistance, heat resistance and aging resistance.
2. The tube body is tightly combined, soft to use and small in deformation under pressure.
3. The hose has excellent bending resistance and fatigue resistance.
4. The rubber hose has high bearing pressure and superior pulse performance.
Application of hydraulic hose
The products are mainly used in mine hydraulic supports and oil field exploitation, and are suitable for conveying petroleum-based (such as mineral oil, soluble oil, hydraulic oil, fuel oil and lubricating oil) and water-based liquids (such as emulsion, oil-water emulsion, etc.) with certain pressure (higher pressure) and temperature in engineering construction, lifting transportation, metallurgical forging, mining equipment, 60MPa, injection molding machinery, agricultural machinery, various machine tools and mechanized and automatic hydraulic systems of various industrial departments.
Precautions for hydraulic hoses
First, Inner diameter of pipe: the inner diameter of hose.
Second, the hose in use and design should pay attention to the following items:
1. The bending radius of the hose should not be too small, generally not less than the value specified in Technical Features of Hydraulic Hose Assembly. There should be a straight section at the joint between the hose assembly and the pipe joint, and the length of this section should not be less than twice the outer diameter of the pipe.
2. The length of the hose assembly should take into account that the hose will shrink and deform after the pressure oil is introduced, and the general shrinkage is 3 ~ 4% of the length of the hose. Therefore, when the hose assembly is installed, it is not allowed to be in a tight state.
3. The hose assembly shall be installed without torsional deformation. The joint axis of the hose should be placed in the plane of movement as far as possible to avoid damage to the hose when the two ends move with each other.
4. The rubber hose should avoid contact and friction with sharp corners on the machinery to avoid damage to the hose.
Safety measures of hydraulic hose
In order to ensure the safe and reliable use of the hose assembly, special attention should be paid to the following matters.
1. Pressure: Under normal circumstances, the specified working pressure of the hose can not be less than the maximum system pressure, and it can only be increased by 20% if it is not used frequently; For those who use it frequently and often bend and twist, it should be reduced by 40%. If the impact pressure of the system is higher than the specified working pressure of the hose, it will not only reduce the service life of the hydraulic hose, but also lead to personal and equipment accidents.
2. Temperature: The fluid temperature and the ambient temperature, whether stable or instantaneous, shall not exceed the temperature resistance limit of the hose, and the temperature shall be lower or higher than the recommended temperature of the hose, which may reduce the performance of the hose, cause damage to the hose and cause leakage.
3. Fluid compatibility: The fluid in the hose should meet the requirements in the "Usage" in the product sample, and the service life and safety of the pipe cannot be guaranteed if it is used beyond the requirements.
4. Appropriate end connection: The nut is widely used because of its convenient connection and low cost. However, in the case of large vibration, the loose nut should be fully considered and blue connection should be adopted.
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