Pressure relieving system and method of forging hydraulic machine

Abstract

The invention discloses a pressure relieving system and method of a forging hydraulic machine. A programmable logic controller is used for receiving oil pressure data and outputting proportional servo valve flow commands; the two parallel proportional servo valve flow commands are a coarse adjustment command given by linear flow based on time and a fine adjustment command given by segmented adjustable flow; proportional servo valves are used for adjusting the oil pressure in a slider main cylinder according to the flow commands of the programmable logic controller; a pressure sensor is used for collecting the oil pressure data in the slider main cylinder. The programmable logic controller is used for controlling the two proportional servo valves; a coarse tendency is given to one proportional servo valve so as to improve the pressure relieving efficiency, and segmented fine adjustment is given to the other proportional servo valve so as to the pressure relieving character to improve the stability, so that a good pressure reducing and relieving curve is obtained, and finally the purposes of high-pressure small-gradient stable pressure relief and low-pressure large-gradient rapid pressure relief are achieved.

Description

technical field [0001] The invention belongs to the technical field of forging hydraulic presses, and in particular relates to a pressure relief system and a pressure relief method of a forging hydraulic press. Background technique [0002] With the increasingly wide range of applications of forging hydraulic presses, the production of large-tonnage hydraulic presses has a wide range of applications and market prospects, and its technological movements are becoming more and more complex. Make higher demands. The traditional hydraulic press adopts a single linear slope pressure relief method through the proportional relief valve. If this method is applied to a large-tonnage hydraulic press, the pressure relief process is too slow and the stability is poor, so the slider will have a long time for pressure relief or pressure relief. There is an impact phenomenon. Contents of the invention [0003] In order to solve the technical problems existing in the known technology, th...

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Problems solved by technology

The traditional hydraulic press adopts a single linear slope pressure relief method through the proportional relief valve. If this method is applied to a large-tonnage hydraulic press, the pressure relief process is too slow and the stability is poor, so the slider will have a long time for pressure relief or pressure relief. There is an impact phenomenon

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