( 1) Choose the sealing ring and the sealing slot size to do reasonably select sealing device, must be familiar with various forms and features of sealing device, the characteristics of sealing materials and sealing device of conditions of use, such as the size of the working pressure, the temperature of the working environment, the speed of moving parts, etc. The use of the actual condition and the seal allows the use of comparison, must ensure that the sealing device has good sealing performance and long service life. Sealing materials should be compatible with the hydraulic oil, its hardness to the right. Rubber hardness to undertake choosing according to system work pressure high and low. System pressure high, choose high hardness of rubber seal, pressure is too high, still need to design supporting ring. To make reliable sealing, long service life, in the design of seal groove, must have the appropriate amount of compression ratio and tensile, compression ratio cannot be too large nor too small. , large compressive stress to increase the friction force increases, accelerate the seal wear, easy to distort, shorten the life, sometimes cause assembly difficulty; Too small, poor sealing, leakage. 0 ring because of its simple structure, easy to install, good sealing performance and reliable work, as a static seal in almost no leak, so is the more widely used seals. Stretching is sealing effect to the circle and outer circle within 0 ring, from raising life consideration, design should try to avoid sealing ring line diameter of the center line is drawn, so the sealing ring should be selected according to national standard, and seal groove should be designed according to the corresponding standard. In case of necessity to design, but shall strictly control the size tolerance, roughness to conform to the requirements, because of the depth of sealing groove width is too large or too deep can cause compression quantity is not enough and cause leakage. ( 2) Parts and pipeline structure design to reasonable component design must have the orientation Angle, so as not to damage seal assembly. At the site of the sharp edge and grooves seal assembly, to use cases, so as not to damage the seals. Set the hydraulic line should make the distance between the fuel tank to the actuator as short as possible, pipe bend, especially the 90 ° elbow to as little as possible, in order to reduce the pressure loss and friction. Should try to reduce pipe joint in hydraulic system, the system oil is 30% ~ 40% by the pipe joint leakage. ( 3) To control the oil temperature of hydraulic system oil temperature is too high, oil film thinning, friction, wear, sealing material aging faster, make it become hard and brittle, and could soon lead to leakage. Control of the hydraulic system, the rise of temperature generally from the design of the fuel tank and hydraulic pipe set aspects. In order to increases the heat dissipation effect of tank, can increase the fuel tank of the surface of the heat dissipation, put inside the oil tank and oil return with the diaphragm. The temperature of the hydraulic oil tank generally allow between 55 ~ 65 ℃, the highest must not exceed 70 ℃. When natural cooling oil temperature exceeds allowable values, you need inside the tank to increase cooling pipes or on the back to the oil cooler, in order to reduce the temperature of hydraulic oil. ( 4) Choose a suitable structure of hydraulic components and pipe joint to choose the appropriate hydraulic components, such as electromagnetic directional Industrial Valves. If the system does not require a quick switch, should choose wet type solenoid Industrial Valves. Because of wet type solenoid Industrial Valves long life, small impact, push rod without dynamic seal, eliminates the push rod parts caused by leakage. That is commonly used in the hydraulic system pipe joint are flaring type, card sets of type and welding type three categories. The three joint each have characteristics, reliability and economy of choice should be based on work. Generally cheaper, flaring joint card sleeve joint can bear larger vibration, welding joint for can bear high pressure, high temperature and mechanical load and strong vibration of the occasion. ( 5) Strictly control the manufacturing quality control strictly seal groove size tolerance, surface roughness to achieve the drawing required. Groove edge cannot have burr and bruised, should be cleaned before assembly. Packing gland size and flange cover screw holes to ensure the quality, clearance cannot too big, in order to avoid the seals have been pushed out. In addition, in production, to strengthen the maintenance and management, regular check and repair hydraulic equipment in a planned way, to protect the hydraulic equipment, mechanical vibration and shock pressure, prevent leakage, timely detection equipment to reduce the fault and the oil leakage, extend the service life of machine and increase integrity rate of the equipment.
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