How to eliminate the unloading and reversing hydraulic shock of the frame hydraulic press?

(1)frame type hydraulic pressPressure in the pre-release circuit When people release the pressure energy enclosed in the hydraulic cylinder in an appropriate manner, and then manipulate the main hydraulic system, the pressure shock can be eliminated.
There is a two-position two-way solenoid valve in the upper chamber oil circuit of the hydraulic cylinder for relieving pressure. When the work is completed, before the main reversing valve is reversed, the pressure relief valve is electrically connected by means of a time relay, about 3 to 5S. When the circuit pressure drops to 0 or close to 0, the main reversing valve is connected again. At this time, there will be no pressure shock. Note that the piping of the pressure relief valve must be small enough (within 6mm diameter), otherwise a new pressure shock will occur. UseBoxHydraulic pressure relief circuit composed of reversing valve and throttle valve, that is, when the electro-hydraulic reversing valve returns to the neutral position, the pressure in the upper chamber of the cylinder is slowly released through the throttle valve and one-way valve, so the hydraulic cylinder does not need special pressure relief.

(2)BoxHydraulic press to extend the pressure relief time hydraulic control check valve is widely used in large press pressure holding and pressure relief. During the pressure holding process of the hydraulic system, the energy stored by the compression of the oil, the expansion of the pipeline and the elastic deformation of the machine will be suddenly released when the pressure is released. During the return process of the hydraulic cylinder at the end of pressure holding, the pressure in the upper chamber may have increased before the pressure in the lower chamber has been released, causing the unloading valve and the main valve core of the hydraulic control check valve to open at the same time, thus causingGantry hydraulic pressThe sudden oil discharge of the upper cavity of the hydraulic cylinder; the combination of the two aggravates the impact vibration and noise of the hydraulic system.