The Comparison of Energy Usage of Directional and Pressure Control Valve in Hydraulic Press Machine

Abstract

The hydraulic press machine is a equipment the most widely used in the metal forming industry. The reason that the hydraulics system to power as many as but the energy efficiency of the system is relatively low. Thus, the current energy conservation crisis in the hydraulics therefore a key issue. Our aim was to create a machine hydraulics 10 tons. To study the interaction of electrical energy by comparison testing, the energy loss of machine during a stroke waiting to reduce pressure by the directional control valve (DCV 4/3) with pressure control valve (PCV) and reduce the flow rate of the hydraulic pumps by reducing the speed of electric motors with VSD, which were divided into 5 testing. In the 1st case, the valve DCV 4/3 center position closed with PCV without vent relief. Found that the most loss of electrical energy, the rate of energy loss is on the increase as a percentage of the pending time. The 2nd case, DCV 4/3 center closed and PCV with vent relief. 3rd case, DCV 4/3 center position P connected T with PCV vent relief without. And the 4th case used DCV 4/3 center position P to T and a PCV with vent relief. All third case 2nd to 4th are that the loss of electrical energy and similar trends are increasing as a percentage of idle time on pending applications increased as well. The trial in 5th cases Bringing the 4th trial the VSD reduces the electric motor at 450 revolutions per minute at an idle time. So, this case is a less energy loss. All 5 testing of the trial, compared the loss of electric power decreased. By bringing the 2nd to 5th cases compared to the 1st case at the idle time from 20 percent to 240 will result in the loss of electrical power down from the 1st case is 2nd, 3rd and 4th have the energy loss reduction approach is more than 70 percent and the 5th reduced energy losses up to 89 percent. Compared with the 4th to 5th case found that the VSD can reduce the loss of more than 15 percent. Therefore, the researchers suggest that the VSD is a significant reduction, energy loss in the hydraulic press machine.