On measures to lift how to solve the leakage of the hydraulic system
1) reasonable selection of seals and seal groove dimensions to achieve a reasonable choice of seals, sealing device form and must be familiar with a variety of characteristics, characteristics of sealing materials and seals conditions of use, such as job stress, work environment temperature and speed of the moving parts. Seals of the actual conditions of use and permitted conditions of use compare must ensure the sealed device has good sealing performance and long service life. Compatibility of sealing material with hydraulic oil, its hardness to the right. Rubber hardness to choose high or low depending on the system pressure. System high pressure seals select plastic material with high hardness, high pressure, and design supporting ring. To make reliable, long life, when designing the seal groove, an appropriate amount of compression and tensile, pressure product can not too big nor too small. Large compressive stresses increase, increasing friction, accelerate seal wear and easy to distort or damage, this product can also short lived, sometimes assembling difficulties is too small it seals well leak. 0-ring because of their simple structure, easy to install, good sealing performance and reliable, almost as a static Seal leaks, so it is currently widely used seals. Stretch is the circle and outer circle within 0-ring seal, improve life expectancy considerations, design seals should be avoided when diameter Center wire is stretched, so seals should be GB used and seal groove should follow the appropriate standards of design. In extreme cases only designed, but the tolerances must be strictly controlled, roughness should meet the requirements, because the width of the Groove is too large or the depth is too deep will cause the compression caused by the insufficient amount leaking. (2) parts and piping design and reasonable structure
design must be oriented corner to avoid injury when it is assembled seals. In parts with sharp edges and grooves when assembling a sealing ring, to use cases, so as not to damage the seal.
when setting up a hydraulic line distance between actuator and tank should be as short as possible, pipe elbows, especially the 90 ° elbow as little as possible to reduce pressure and friction losses.
fittings should be minimized in the hydraulic system, system leakage 30%~40% by leakage of the fitting.
(3) to control oil temperature too high oil temperature of hydraulic system, thin lubricant film, increased friction, wear, and aging faster sealing materials, so that it becomes hard and brittle, and can quickly lead to leaks. Controlling the temperature of the hydraulic system increases, General tank design and setting for hydraulic piping. For high heat dissipation in the tank, you can increase the cooling surface of the fuel tank, oil and oil inside the tank by partitions. Fuel tank hydraulic oil temperature is generally allowed between 55~65℃, shall not exceed a maximum of 70 ℃. When the natural cooling of the oil temperature exceeds allowed value, you need to increase the cooling water in tank internal tubes or set on the oil cooler to reduce the temperature of hydraulic oil.
(4) select suitable hydraulic components and fitting selection of hydraulic components, such as solenoid valves. If the system does not require a fast switch, you should choose a wet-type solenoid valve. Because a wet-type solenoid valve long service life, low impact, putting no dynamic seals, eliminating the push rod parts causing leaks. Commonly used in hydraulic system fitting flare type, sleeve and welded into three categories. These three connectors have different characteristics, should be selected based on reliability and economy. Flare fittings are comparatively cheap, ferrule joints can withstand greater vibration welded joints can withstand high pressure, high temperature and mechanical loads and strong vibrations of the occasion.
(5) the strictly controlled manufacturing quality control seal groove of dimensional tolerances, surface roughness should meet the required drawings. Slot no burrs and scratches, to be cleaned before Assembly.
seal sizes and flange cover screw holes to ensure quality, the gap is not too big to prevent seals were being squeezed out. In addition, in the production, to strengthen the maintenance and management, there are plans to regularly check and repair of hydraulic equipment, hydraulic devices for protection to prevent mechanical vibrations and impact pressure, leakage of equipment in a timely manner, thereby reducing the failure and leakage of the oil, and extend the life of the machine and equipment in good condition.