The study of energy used in hydraulic press machine

Abstract

Recently, Hydraulic Press has been generally used as a labor-saving device in several functions through industrial section. Previously, most of the factory merely concern about using this powerful device and that caused so much electric energy wasted during the pending process on equipment transformation. Therefore, our team initiated a conceptual study of energy consumption on using hydraulic press. The invention of hydraulic press for the study of electric energy requires hydraulic devices installation. This includes 3.7 kW 3 phases system induction motor and VSD, hydraulic pump single shaft 2 sets, set 1 low flow high pressure at flow rate 3.65 liters per minute, and set 2 high flow low pressure at flow rate 6.79 liters per minute, and total flow rate 10.44 liters per minute, pressure relief valve and 2 ports 2 positions Bypass control valve and 4 ports 3 positions directional control valve, double acting cylinder 100 mm diameter and 250 mm stroke, and pressure gauge. The experiment on energy consumption using hydraulic press has been considered in 5 cases. Each case operated by different hydraulic devices in order to observe the differences of energy consumption. The result of experiment showed that case 1 had electric energy lost the most, the rate of loss will increase as a percentage of the increase in pending. Case 2 to 4, with the lost of electric energy are similar. Case 5 is bringing the case 4 added VSD to adjust the speed of the electric motor is reduced to 435 rpm during the waiting period, so this case had the lost of energy is minimal. After comparative experiment between case 1 and the other 4 cases during the pending process on equipment transformation at 20% - 200%, it revealed that case 2 reduced electric energy wasted more than case 1, accounted for 17.07% - 30.46%, while case 3 to 5 reduced electric energy wasted more than case 1, accounted for 16.06% - 29.52%, 17.37% - 30.80% and 23.90% - 50.55% respectively