The corrosion and damage of the cylinder liner and cylinder liner of the loader can cause cracks and even buried holes, ultimately leading to the entry of cooling water into the cylinder and engine oil, which significantly reduces the lifespan and operational stability of the diesel engine. The main cause of cavitation is the vibration of the cylinder liner. When the piston reaches the top dead center, the direction of lateral pressure changes, and the piston swings horizontally from one side of the cylinder liner to the other. Because there is a thermal gap between the piston and the cylinder liner, the shaking of the piston is still destructive. This type of impact causes strong vibrations in the cylinder liner.
When the cylinder liner wall vibrates, the tension and compression inside the water chamber change, causing partial high pressure and vacuum bubbles to be generated in the water area around the surface. Under the influence of high vacuum, the cooling water of mining loaders evaporates into bubbles, and some vacuum bubbles and bubbles appear in the tiny needle holes on the surface of the cylinder liner, or are squeezed into the needle holes under the influence of vibration.
When vacuum bubbles or bubbles rupture under high-pressure impact, pressure shock waves will be generated around the crack area, with pressures reaching dozens of atmospheres, impacting the surface of the cylinder. Therefore, frequent repeated impacts will rapidly damage the surface of the cylinder liner. The most commonly used method to avoid acupoint erosion is to reduce the gap between the cylinder and piston, and then reduce the vibration of the cylinder liner; Choose a long piston skirt; Increase the flow rate of cooling water, improve the direction of water flow and the structure of the refrigeration system; Improve the support stiffness of the cylinder liner; Improve the material and process of the cylinder liner to enhance its resistance to acupoint erosion.
The causes of cylinder liner corrosion in loaders are as described above. If this situation occurs again, it must be repaired in a timely manner, but prevention is also crucial.
