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이용범(Y. B. Lee),고재명(J. M. Ko),김태석(T. S. Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The intelligent(automation and manless) hydraulic excavator can be realized when the position sensor is equipped within hydraulic cylinder. But, during the time, the installation of position sensor was impossible because cylinder used the cushion at both ends and the broken problem of sensor is arisen under working when it is installed outside of hydraulic cylinder. In order to these problems, we developed high-reliable hydraulic cylinder using a new position detecting technology. As it were, firstly, seat type permanent magnets are installed on the partial load surface of hydraulic cylinder and outer wall is made by use of non magnetic stainless tube, and then the hall sensor detects the rod position of hydraulic cylinder. This technology improved the weak magnetic slope problem arisen when position control is performed, and also solved the electromagnetic noise problem according to increasing of amplification rate of magnetic sensor.
이용범(Y. B. Lee),한성건(S. K. Han),고재명(J. M. Ko) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this study, the heat transfer characteristics and the performance of a shell & tube oil cooler under cooling conditions are investigated. For performance test of oil cooler, we manufactured a test equipment which can heat oil up to the test temperature and supply it continuously to be tested object. This test equipment was composed of 300,000 Kcal/h steam boiler and 300,000 Kcal/h plate type heat exchanger, and this can do real time control the test conditions by the method which high temperature water heats the outlet cooled oil after test. For many different size oil coolers, by use of this equipment, we evaluated the heat exchange performance of oil coolers and pressure drop characteristics in side of oil and cooling water according to flow variation.
이용범(Y. B Lee),김광민(K. M. Kim) 유공압건설기계학회 2010 유공압건설기계학회 학술대회논문집 Vol.2010 No.10
One of the leading construction equipment, excavators that are used various construction sites. Recently, the demand of large-scaled excavators putting into construction fields for industrial plants has been increased, so that domestic construction-equipment industries are beginning with the production of 85ton-class excavators and putting forth for the localization of their components. Excavators can"t be produced domestically, but the whole quantity is imported from Japan and Italy. To insure a competitive power of the domestic 85ton-class excavators, the localization of the track drive unit is highly required. In this study, an experimental comparative-analysis for main functional characteristics of imported track drive units was carried out, and then technical specifications were investigated, which will be required for the domestic of 85ton-class track deive unit.