To reduce the wear of high-pressure nozzle as much as possible, high-pressure nozzle is prone to fatigue wear, nozzle material hardness is high, but when the hardness is high and toughness is very low, this brittle material is impacted and impacted by the impurity particles with large air force, material fracture and wear may occur, forming two types of transverse or radial cracks on the nozzle surface. Brittle fracture and wear of hard nozzle. Our analysis of the above causes of nozzle wear tells us how to minimize this kind of wear, that is, we should pay special attention to the purity of the cleaning medium, try not to contain impurities, and try to reduce the probability and degree of its wear.
The wear of nozzle is the result of friction among impurity particles, high pressure water jet and nozzle hole. Because the edge of the orifice at the nozzle outlet is thin, the impact resistance is relatively weak, so the crack can easily extend to the outer surface of the orifice. It is necessary to analyze the possible causes of high-pressure nozzle wear, and analyze the wear resistance factors and wear factors that affect the service life of high-pressure nozzle. This will cause brittle fracture and wear of the nozzle. That is, the impurity particles erode the surface of the material under the action of the direction velocity component of the impurity particles, and then under the action of the tangential velocity, the particles move along the surface of the material for a period of time.
High pressure cleaning machine to pay attention to protect the nozzle, reduce wear and prolong its life, can reduce the replacement frequency, can reduce the use cost of high pressure cleaning machine. In the long-term operation process of the high-pressure cleaning machine, it is a natural law that all parts must be worn. However, we can also take some preventive measures to minimize the wear and prolong the service life of all parts of the high-pressure cleaning equipment, which is often beneficial to increasing revenue and saving expenditure and reducing cost. Usually, this kind of wear easily occurs on the nozzle material with lower hardness and higher toughness, so as to wear the nozzle.
The water or other liquid used in the high-pressure cleaning equipment can not be very pure, there will always be more or less mixed with some impurities. The impurity particles are like cutting tools to cut the surface of the high-pressure nozzle. On the contrary to cutting wear, the particles under stress fatigue wear act on the nozzle surface at a larger angle, and when the nozzle material is hard, the particles will contact with the surface material under the action of force, which will cause plastic deformation of the nozzle surface material for a long time The continuous impact of the flow and the repeated impact of impurity particles will form the material surface plastic hardening or other physical changes, and the cracks will form and spread step by step until the stress exceeds the strength limit of the nozzle material, and then the nozzle manufacturing material will slowly corrode from the nozzle surface of the high-pressure cleaning machine, resulting in wear.
In the process of use, the wear of high pressure nozzle should be reduced as far as possible to improve the service life.
