Engineering machinery is a modern city development in the process of the construction industry, a kind of indispensable mechanical equipment to expand the interruption in the process of the engineering machinery and equipment involved in the construction work, time reduction, operating costs continue to reduce, but the use of mechanical engineering in the process also need to take care of it, especially the use of engineering machinery at low temperature the environment needs to pay attention to what?
The reason why the use of engineering machinery in low temperature environment need attention, it is because the failure of practice shows that the use of low-temperature environment engineering machinery in the process of comparison, in order to ensure the service life of machinery and the use of performance, so in the winter use of engineering machinery need to pay attention to matters:
1, the attention of low temperature start
The starting performance of the engine at a certain temperature can be expressed at a minimum starting speed, and the minimum temperature at which the engine can be started is used to indicate the starting performance of the engine. The start-up performance is mainly related to the type of engine, the design of combustion chamber and the level of technology. In the process of using, the low temperature start-up of the engine is mainly influenced by the viscosity of engine oil, the evaporation of gasoline or diesel, the low temperature fluidity of diesel oil and the influence of the working capacity of the battery. If the rotation resistance moment of the engine crankshaft and the starting speed of the engine are mainly affected by the viscosity of the lubricating oil at low temperature. With the decrease of temperature, the internal friction of oil is increased, the engine resistance moment is increased, the power required to start the engine is increased.
2. The influence of fuel on the engine starting performance
Start fuel for engine performance at low temperature has great influence, mainly in the evaporation, with the decrease of temperature, oil viscosity and relative density increases; reduce liquidity in the diesel engine under the condition of low temperature viscosity increases, causing poor atomization of diesel combustion process, so bad. When the temperature is further reduced, the fuel will be gradually lost due to the precipitation of the wax from the fuel. If the diesel contains water, winter may also cause the supply of ice and can not work. Therefore, it must be used for precipitation and filtration of diesel oil.
3, after entering the fall, to respond to the battery and start the machine maintenance and maintenance
In the selection of appropriate electrolyte density must pay attention to, because the work has an important influence on the density of the electrolyte battery, battery insulation work or enhance winter winter with large capacity battery, but also improve the engine starting performance of a measure.
4, should pay attention to the low temperature wear of construction machinery
The engine cycle, 50% cylinder wear occurred in the process of starting and starting at low temperature has more influence on the engine wear, there is the engine cold start, cylinder wall wear serious reasons are: in the startup process, the cylinder wall lubrication conditions; cold start, most of the fuel into the cylinder in liquid the scour, cylinder wall oil film.
In short, the winter use of construction machinery in the process must pay attention to the above factors, the only way to ensure that the purchase of construction machinery products used in the stability of the performance and the use of long life