EN 
中文简体Hose (hose) assembly is an auxiliary device commonly used in hydraulic systems. It is made of high-pressure steel wire braided or wound rubber hose and steel joints with special equipment and is used to connect various hydraulic components in the hydraulic system. It is mainly used for hydraulic power transmission under the working temperature of -40℃ to +100℃ Or transport high-pressure media such as water, gas, oil, etc., to ensure the circulation of liquids and transfer liquid energy.
Features and uses
The high-pressure hose assembly is generally composed of a liquid-resistant synthetic rubber inner rubber layer, a middle rubber layer, a steel wire braided reinforcement layer I to VI layers, and a synthetic rubber outer rubber layer with excellent weather resistance. Mainly used for mine hydraulic support, oilfield mining, suitable for engineering construction, lifting and transportation, metallurgical forging, mining equipment, ships, injection molding machinery, agricultural machinery, various machine tools and mechanization and automatic hydraulic systems of various industrial sectors. and temperature petroleum-based (such as mineral oil, soluble oil, hydraulic oil, fuel oil, lubricating oil) liquid, water-based liquid (such as emulsion, oil-water emulsion, water), gas, etc. and liquid transmission fields.
Executive standard
1. The standards often used in domestic and foreign trade of hydraulic hoses include DIN, SAE, ISO and GB/T standards;
2. The standards for steel wire braided hydraulic hoses are: DIN EN 853, SAE J517, GB/T 3683-2011, ISO1436;
3. The standards for wire wound hydraulic hoses are: DIN EN 856, SAE J517, GB/T 10544-2003, ISO3862.
Precautions
1. The inner diameter of the tube: the inner diameter of the hose.
2. The following matters should be paid attention to in the use and design of the hose:
①The bending radius of the hose should not be too small, and generally should not be less than the value specified in "Technical Characteristics of Hydraulic Hose Assembly". There should be a straight section at the connection 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.
②The length of the hose assembly should take into account that the length of the hose will shrink and deform after the pressure oil is introduced into it. Generally, the shrinkage amount is 3 to 4% of the length of the hose. Therefore, when the hose assembly is installed, it is not allowed to be in a tensioned state.
③The hose assembly should be installed without torsional deformation. The joint axis of the hose should be placed in the moving plane as much as possible to avoid damage to the hose when the two ends move with each other.
④The hose should avoid contact and friction with the sharp corners of the machine to avoid damage to the tube.
3. Safety measures: In order to ensure the safe and reliable use of the hose assembly, pay special attention to the following matters.
① Pressure: Normally, the specified working pressure of the hose cannot be less than the maximum system pressure. Only in the case of infrequent use, it is allowed to increase by 20%; for frequent use and frequent bending, 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 may cause personal equipment accidents.
②Temperature: The fluid temperature and ambient temperature, whether stable or instantaneous, must not exceed the temperature resistance limit of the hose, and the temperature is lower or higher than the recommended temperature of the hose, which can reduce the performance of the hose and cause the hose. damage, resulting in leakage.
③the service life and safety of the tube cannot be guaranteed.
4. Appropriate end connection: It is widely used due to the convenience of nut connection and low cost, but in the case of large vibration, the looseness of the nut should be fully considered and flange connection should be adopted.
