(1) a reasonable choice of seal ring and seal groove size To be able to choose a reasonable seal, you must be familiar with the form and characteristics of a variety of seals, sealing material characteristics and sealing conditions of use, such as the size of the working pressure, the working environment The temperature, the speed of the moving part and so on. The actual conditions of use and allow the use of seals to compare, must ensure that the sealing device has good sealing performance and long service life. Sealing material to be compatible with the hydraulic oil, its hardness should be appropriate. Rubber hardness should be based on system pressure level to choose. The pressure of the system is to choose the high hardness rubber seal, the pressure is too high, but also the design of the support ring. In order to seal reliable, long life, in the design of seal groove, there must be appropriate compression rate and stretch, compression rate can not be too large nor too small. Too large compressive stress increases, the friction increases, speed up the seal wear, but also easy to produce distortion damage, short life, sometimes resulting in assembly difficulties; is too small, the seal is not good, resulting in leakage. O-ring due to its simple structure, easy to install, good sealing performance and reliable, virtually no leakage for static sealing, it is the current application of a wider range of seals. Tensile amount is for the inner circle and outer circle sealing role of 0-ring, from improving life expectancy, the design should try to avoid the centerline of the ring diameter is stretched, so the seal should be selected according to national standard , And the sealing groove should also be designed according to the corresponding standard. In the case of last resort only to their own design, but the dimensional tolerances should be strictly controlled, the roughness to meet the requirements, because the seal groove width is too large or too deep will cause insufficient compression caused by leakage. (2) parts and piping structure design should be reasonable when the steering angle design parts, so as not to damage the seal assembly. In the sharp edge and groove parts of the assembly ring, the use of protective sleeve, so as not to damage the seal. The hydraulic line should be set so that the distance from the tank to the actuator is as short as possible and the bend of the line, especially the 90 ° bend, should be as small as possible to reduce pressure loss and friction. Hydraulic system should minimize pipe joints, the system has 30% to 40% of oil leakage from the pipe joints. (3) To control the oil temperature of the hydraulic system, the lubricating oil film becomes thinner, the friction force increases, the abrasion aggravates, the aging of the sealing material is accelerated, hardens and becomes brittle, and may cause leakage quickly. Control of hydraulic system temperature increases, generally from the tank design and hydraulic piping settings. In order to mention the cooling effect of the fuel tank, you can increase the cooling surface of the fuel tank, the oil tank and the oil return to the internal partition with a partition. The temperature of the tank hydraulic oil is generally allowed between 55 ~ 65 ℃, the maximum may not exceed 70 ℃. When the natural cooling oil temperature exceeds the allowable value, you need to add a cooling pipe inside the tank or set in the oil return cooler to reduce the hydraulic oil temperature. (4) Select the appropriate structure of the hydraulic components and fittings Select the appropriate hydraulic components, such as solenoid valve. If the system does not require fast switching, you should choose wet solenoid valve. Because of the long life of wet-type solenoid valve, the impact of small, no passive seal at the push rod, eliminating the push rod parts caused by leakage. Commonly used in the hydraulic system fittings flare, card sets and welding three categories. These three joints have their own characteristics, should be based on job reliability and economy of choice. Expansion joints are generally cheaper, the ferrule joints can withstand greater vibration, welded joints for pressure, temperature and mechanical load and strong vibration of the occasion. (5) Strict control of manufacturing quality Strict control of the seal groove size tolerance, surface roughness to meet the requirements of the drawings. Slot edges can not have burrs and bumps, clean before assembly. Seal cover size and flange cover screw to ensure quality, the gap can not be too large, in order to avoid the seal is squeezed out. In addition, in production, to strengthen the maintenance and management, regularly scheduled to inspect and repair hydraulic equipment to protect hydraulic equipment to prevent mechanical vibration and shock pressure, and timely detection of equipment leakage, thereby reducing leakage and oil leakage, to extend the machine Life expectancy, improve the equipment intact rate.
Engineering And Construction Machinery
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