The role of proportional valve in hydraulic system of small tonnage hydraulic press

The Hydraulic Press is the most used equipment in our mechanical equipment. Many hydraulic presses have their own core components. For example, the proportional valve plays an irreplaceable role in the entire hydraulic system of the hydraulic press. First of all, there is no pre-pressure relief measure, the pressure of the pressing process Keep the pressure at 8MPa. The pressure energy is stored in the lower chamber of the main hydraulic cylinder. At the moment when the Mold is opened after the pressure is maintained, the pressure energy in the lower chamber of the main hydraulic cylinder suddenly accumulates and produces noise. Then the proportional valve plays a role in the hydraulic system of the small tonnage hydraulic press, let me talk about it.

The role of the proportional valve in the hydraulic system of a hydraulic press:

  • 1. During working hours, the quantitative pump oil returns to the tank with load, resulting in energy loss, and the oil circuit is very complicated;
  • 2. The pressing process requires electric heating of the workpiece while cooling the machine by spraying water. Therefore, the production site and the operation site are separated, the operation of the machine is remote operation, and the pressure adjustment of the ordinary pressure valve is not easy to achieve remote operation;
  • 3. The electromagnetic safety valve at the outlet of the quantitative pump is a high-pressure valve, and the unloading pressure is 0.35MPa. When parking, although the IYA power is turned off and the quantitative pump is unloaded, the electromagnetic reversing valve leaks in the middle, and the leaked oil is enough to open the hydraulic one-way valve and enter the lower cavity of the main hydraulic cylinder.

Due to the large area of ​​the piston, the oil pressure of 0.35MPa causes the piston to rise slowly, causing an accident, which is absolutely not allowed. In order to solve this problem, a two-position two-way solenoid directional valve was added. When parking, the power supply of 8YA is cut off and the unloading pressure is reduced.

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