The function of the oil cylinder converts the mechanical energy output by the engine into hydraulic energy, and distributes it to each actuator through the main control valve to realize the various actions of the excavator. When repairing mechanical cylinders, you can often see honeycomb-shaped cavities on the inner wall of the cylinder, the surface of the piston or the piston rod, which are all caused by cavitation.
Cavitation corrosion is the phenomenon of cave-like corrosion damage on the metal surface in contact with the fluid under the conditions of high-speed flow and pressure change. The following is a method for preventing cavitation in the cylinder of an excavator introduced by the editor.
The harm of cavitation in the mechanical cylinder is quite large, it will cause the mating surface to become black, and even the support ring and sealing ring may be burnt, which will cause internal leakage in the digging cylinder. When cavitation and other types of corrosion work together, it will accelerate the corrosion rate of the main parts of the cylinder several times or even dozens of times, which will seriously affect the normal use of the machine. Therefore, it is very necessary to prevent cavitation in the cylinder.
The preventive measures we should take for cavitation are: strictly control the selection of hydraulic oil, and select hydraulic oil in strict accordance with the oil standard. The selection of high-quality hydraulic oil can effectively prevent air bubbles from appearing in the hydraulic system during the working process; maintain the normal clearance of the joint surface of each hydraulic component. When manufacturing or repairing the main parts of the hydraulic cylinder, the lower limit of the assembly size tolerance should be followed Assemble.
