Hydraulic oil pump sucks air due to improper design of oil tank
Due to the stirring effect of the concave oil in the oil tank, the hydraulic press is prone to produce suspended air bubbles trapped in the oil. If it is brought into the hydraulic system, it will cause many failures (such as pump noise, cavitation and hydraulic cylinder crawling, etc.).
To this end, ① a defoaming baffle should be installed in the fuel tank to separate the oil return area of the system from the pump suction area in the fuel tank. The return oil is baffled by the baffle, and the flow rate slows down. It is conducive to the separation of air bubbles and overflow of the oil surface:
However, it is difficult to separate fine air bubbles in this way, and the separation efficiency is not high. Set up a metal mesh vertically and install a golden slanted mesh at the bottom of the fuel tank, and use a 60-mesh mesh to defoam the best. When the balance is zero, the bubbles are attached and stay on the golden mesh and wait to form a large diameter with other surrounding bubbles. The straightness of the bubbles rising again is negative, and is proportional to the flow rate of the sludge through the metal mesh. If the same surface area is used, the greater the flow rate and the higher the viscosity, the easier the bubbles pass through, so try to reduce The flow rate f is if a diffuser is installed at the end of the oil return pipe). The value of & is always positive, and the larger the diameter of the bubble, the larger the &, so the large diameter bubble is easy to separate from the oil. Affected by the density of the metal mesh, the denser the mesh, the greater the surface tension.
When the air filter on the hydraulic case cover is blocked by dirt, it is difficult to separate it from the air. At this time, it will also cause the oil level of the oil tank to fluctuate during the working process of the hydraulic system, which will generate negative pressure in the oil tank and cause poor suction of the pump. . Therefore, the air filter should be disassembled and cleaned at this time.