market dynamics
Construction machinery life extension tips
Release date:2019.05.20

Before the speech

The cost of construction machinery is very high, so we should take good care of construction machinery, extend the life of construction machinery.

In general in addition to minimize the impact of harmful factors should also be in the use of construction machinery to ensure the normal working load. Here are some details:


Reduce the impact of mechanical impurities

Mechanical impurities generally refer to the dust, soil and other non-metallic materials and construction machinery in the use of some of their own metal chips, wear products. Once these impurities into the machine, between the mechanical surface, its harm is very big, not only make the relative movement out of retardation, accelerate the wear parts, but also will scratch with the surface, damage the lubricating film, make the parts temperature rise, lubricating oil deterioration.


According to the measurement, when the mechanical impurities in the lubrication increased to 0.15%, the engine first piston ring wear speed will be 2.5 times greater than the normal value; The service life of the rolling shaft will be reduced by 80% to 90% when entering impurity particles. Therefore, for the construction machinery working in the harsh environment and complex conditions, the first is to use high-quality, matching parts and lubricating oil, grease, plug the source of harmful impurities; Second, to do a good job in the field of mechanical protection work, to ensure that the corresponding institutions can work normally, prevent all kinds of impurities into the internal machinery. The breakdown of machinery, as far as possible to the formal repair site for repair. When the site repair, also want to do a good job of protection measures to prevent the site repair replacement parts before entering the machine by dust and other impurities pollution.


Reduce the impact of temperature

In operation, the temperature of each part has its own normal range. Such as the general cooling water temperature is 80-90 ℃, the temperature of the hydraulic drive system of the hydraulic oil for 30 to 60 ℃, below or above this range will speed up the process of wear parts, cause lubricating oil deterioration, the change of material performance and so on.

Test shows that all kinds of engineering machinery main drive gear and bearing in operation in lubricating oil - 5 ℃ than at 3 ℃ operation in lubricating oil, wear to increase 10 to 12 times. But when the temperature is too high, it will accelerate the deterioration of lubricating oil, such as oil temperature over 55 to 60 ℃, the oil temperature rise every 5 ℃, the oil oxidation rate will be doubled.

For this reason, construction machinery in the use of the process, one must prevent overload operation under low temperature, to ensure the normal operation of low-speed pre-temperature stage, so that the machinery to reach the specified temperature before driving or working, do not ignore its important role because there is no problem at that time; Second, to prevent the operation of machinery in high temperature, machinery in the process of operation to check the value of a variety of temperature tables, found that the problem immediately shut down for inspection, found fault in a timely manner. For those who can not find the cause for the time being, they must not be treated and still make the machine work with illness. In the usual work, should pay attention to check the working condition of the cooling system. For water-cooled machinery, it must be checked before daily work and add cooling water; For air-cooled machinery, the dust on the air-cooled system should also be cleaned regularly to ensure that the cooling duct is smooth.


Reduces various corrosive effects

Corrosion occurs when the surface of a metal is damaged by chemical or electrochemical interactions with the surrounding medium. This corrosion will not only affect the mechanical appearance of the normal operation of equipment, but also will corrosion to the mechanical internal parts. For example, chemicals in rain water and air enter into the internal parts of machinery through external channels and crevices of mechanical parts, corrode the internal parts of machinery, accelerate mechanical wear and increase mechanical failure. Because this corrosion is sometimes invisible, intangible, easy to be ignored, and its harm is greater. In use, management and operation personnel should take effective measures to reduce the impact of chemical corrosion on machinery according to local weather conditions and air pollution at that time, with the focus on preventing the intrusion of chemical composition in rain water and air on machinery.


Ensure normal working load

The working load and property of construction machinery have important influence on the loss process of machinery. Generally speaking, the wear of parts increases proportionally with the increase of load. The wear and tear of the parts will be aggravated when the load they bear is higher than the average design load. In addition, other conditions are the same, the stable load than the dynamic load wear less, less failure, low life. The results show that the wear of the cylinder increases by 2 times when the engine works under unsteady load and stable load. The engine working under normal load has lower failure rate and longer service life. On the contrary, the overload of the engine, the failure rate increased significantly, life will be less than the design index. Mechanical wear, which is always in a wide range of load changes, is greater than that of continuously stable working machinery.