The pitting corrosion damage of the cylinder liner and cylinder liner of small loaders will cause cracks or even holes, leading to the cooling water entering the cylinder and oil, thus significantly reducing the service life and working stability of diesel engines. The main cause of the pitting corrosion is the vibration of the cylinder liner. When the piston reaches TDC, the action direction of side pressure changes, and the piston is placed horizontally from one side of the cylinder liner to the other side. As there is a thermal clearance between the piston and the cylinder liner, the vibration of the piston still has an impact. This effect will cause strong vibration of the cylinder liner.
When the cylinder liner wall vibrates, the tension and compression in the water chamber change, resulting in some high pressure and vacuum bubbles in the water around the surface. Under the action of high vacuum, the cooling water volatilizes into bubbles, and some vacuum bubbles and bubbles appear in the small needle holes on the cylinder liner surface, or enter the needle holes under the action of vibration.
Causes and Prevention of the Cylinder Liner Cavitation of the Second hand Loader
When the real air bubble or bubble breaks under high pressure impact, the pressure shock wave will be generated around the crack area, and the pressure can reach dozens of air pressures and affect the cylinder surface. Therefore, frequent repeated impacts will seriously damage the cylinder liner surface. In order to avoid acupoint erosion, the common method is to reduce the clearance between the cylinder and the piston, and then reduce the vibration of the cylinder liner; Select long piston skirt; Increase cooling water flow, improve water flow direction and refrigeration system structure; Improve the support stiffness of the cylinder liner; Improve the material and process of the cylinder liner to improve its resistance to acupoint erosion.
The reasons for cylinder liner cavitation corrosion of small loaders are described above. If this happens again, it must be repaired in time, but prevention is also the key.
