Research Of Heat Balance On Small Hydraulic Excavator

Heat balance is an important performance of hydraulic excavator,which affects the usability of the machine.At present, domestic excavator manufacturers all invest a lot of energy on small hydraulic excavator in order to gain a foothold in the market. High temperature will make lower thermal efficiency,higher fuel consumption and bad emissions,also may cause lower lubrication efficiency,which will shorten the machine's life.In this paper,we researched the main parts of cooling system,combined with the market survey.Firstly,we did research to the main parts of the cooling system.For the excavator,its cooling system mainly includes radiator,cooling fan,water pump,thermostat,etc.Nowdays,almost all hydraulic excavators are equipped with automatic alarm device,when alarmed,we should confirm first in case of fault.In simple words,the causes of high temperature including blockage,less of cooling liquid,poor sealing of the radiator and so on,In addition,the overheat of hydraulic oil and air conditioning condenser also may be the cause.Secondly,according to the market feedback,we dealed with the overheat machines in the spot.In general,the malfunction is not always occur in the period of maximum temperature,this shows some external factors may have a significant impact on the machine,which are likely to be flocculant and grass and leaves sucked by fan.After investigation, the radiator blockage was found the main cause of overheat,and this also proves the importance of sealing and dustproof.Finally,we tested the heat balance of improved radiator, cooling fan and hood on the same excavator.According to the test results,if the increase of the radiator cooling area is small,the improvement is small too,while the improvement of fan has more progress.Also the increase of ven makes great improvement.