HYDRAULIC SYSTEM CAPABLE OF MINIMIZING ALLOWALBE RANGE BETWEEN SAFETY LOAD AND EXCESSIVE LOAD BY USE OF SAFETY VALVE OF HYDRAULIC CRANE

摘要

The present invention relates to a hydraulic system capable of minimizing an allowable range between a safety load and an excessive load by use of a safety valve of a hydraulic crane that is designed to be suitable for a safety test and a durability test, and solves reduced speed of a hydraulic motor after the safety test, thereby quickly performing normal operation. The system includes: an oil storage tank; a hydraulic pump for feeding the stored oil; a hydraulic motor driven by the oil supplied by the hydraulic pump; a hydraulic operating valve for controlling supply of the oil from the hydraulic pump to the hydraulic motor; a first line connected to one side of the hydraulic motor and the hydraulic operating valve; a second line connected to the other side of the hydraulic motor and the hydraulic operating valve; and an oil supply limiting member installed in the first or second line to interrupt the oil supply line when hydraulic pressure is equal to or higher than a predetermined value.;COPYRIGHT KIPO 2018