Abstract:

Hydraulic drive systems are commonly used in many different industrial sections. In the underground mining industry, in addition to ensuring transmission for big equipment, hydraulic equipment also must be fire safety. During the working process, the hydraulic oil gets hot and the viscosity decreases, it make the transmission power decrease. Due to the harsh actual working conditions of hydraulic equipment such as high working intensity, high working environment temperature, the oil cooler cannot cool the hydraulic oil to the required temperature. In order to choose the right type of oil cooler for hydraulic actuators, it is necessary to calculate the working parameters of the oil cooler according to specific working conditions. Currently, the selection of hydraulic oil coolers is often based on the experience of the designer, so it can lead to errors. In order to increase the reliability of the hydraulic oil cooler, this paper has built a calculation formula based on the thermodynamic theory and the heat transfer characteristic graphs in the catalogs of the hydraulic oil cooler. At the same time, the paper made an illustrative example for the selection of the hydraulic oil cooler of the JKYB hydraulic explosion-proof hoist used at Duong Huy coal company.