Measures to Remove Prospects of Hydraulic Method Leaking

(1) Choose Seal Ring & Seal Groove of Suitable Size

The material of sealing should be consistent with the hydraulic oil and the hardness of rod mill should be chosen in accordance with the operating pressure of the technique. To get a reliable sealing with long life, suitable compressibility and tensile strength is needed when designing the seal groove. Too high compressibility will improve the compress and friction force, which will accelerate the wearing of the seal ring and reduce its life. While, too low compressibility can not ensure excellent tightness and lead to leaking. O-shape seal ring is broadly applied for its simple structure, simple installation process, excellent tightness and reliable performances. For the sake of improving the life of seal rings, it might be avoided that the central line of seal ring is stretched in designing. Therefore, the selection of seal ring will need to be based on the international standard and the seal groove will need to also be designed according to the corresponding standard.



part 2 Reasonable Structural Design of Parts and Pipelines



When designing the parts, guide angle is needed in case that the seal components be hurt in installation. When install seal ring in the parts which have sharp edges and grooves, we will need to use a protective sleeve in case that the seal components be hurt. When designing the hydraulic pipeline, we must keep the distance from the oil tank to the rod mill as short as possible, and keep the bent of the pipeline, especially bent of 90°as few as possible to lower the pressure loss and friction force. In the hydraulic program, pipe fittings will need to be reduced as few as possible since 30%-40% of leaking is from the pipe fittings.



(3) Control the Oil Temperature in Hydraulic System



When the oil temperature is too high, the lubricating oil film will get thinner, the friction force will be increased, wearing will be increased, aging of the seal material will be accelerated and the seal will get harder and fragile which will finally result into leaking. To improve heat dissipation, we can enhance the dissipating surface of the oil tank and separate the inlet and outlet inside the tank with a plate. Temperature of the oil tank must be kept between 55- 65??, 70?? at most. When the temperature of the oil cooled naturally exceeds the limit number, cooling pipe will need to be added inside the tank or a cooler should really be set in the outlet oil line to lower the temperature of hydraulic oil.



(4) Choose Suitable Weld Fittings



Weld fittings that are most often used in hydraulic method can be divided into three types, flared, card-sets and welded. These three sorts of fittings have their own benefits each, so it really should be chosen based on the reliability of performance and economical efficiency. Flared fittings are comparatively cheap. Card-sets fittings can bear large vibration. Weld fittings can be used in occasions of high pressure, high temperature, big mechanical load and strong vibration.



(5) Control the merchandise Quality Strictly



The size tolerance of the seal groove must be controlled strictly and the surface roughness will need to also meet the specifications. There should never be burr or damaged parts on the brim of the groove. The groove also needs to be cleaned before installation. The size of the seal cover and the hole of the flange cover should certainly ensure quality, since too big gap may cause the seal components being squeezed out.



In addition, we ought to strengthen maintenance and management in the production process by checking them periodically, repairing and protecting the hydraulic equipments to prevent mechanical vibration and shock pressure, to discover the leaking of the equipment in order to reduce accident and oil leaking. In this way, we can improve the life of the machine and the perfectness ratio of the equipments.