Numerical control pressure hydraulic system

Abstract

The invention discloses a numerical control pressure hydraulic system and relates to the technical field of hydraulic machines. The numerical control pressure hydraulic system comprises a pressure sensing device, a program control device and a proportional overflow valve, wherein the pressure sensing device is used for collecting oil pressure data in a slide block main cylinder, the program control device is used for receiving the oil pressure data, segmenting the oil pressure data according to the sizes of the oil pressure data and outputting different linear control instructions in different segments, the proportional overflow valve is used for adjusting the oil pressure in the slide block main cylinder according to the linear control instructions, the pressure sensing device is electrically connected with an analog quantity input port of the program control device, and an analog quantity output port of the program control device is electrically connected with the proportional overflow valve. The numerical control pressure hydraulic system disclosed by the invention achieves continuous and variable-speed control on slide block pressure relief by controlling a continuous descending speed of the proportional overflow valve according to size correspondence between the oil pressure data in the slide block main cylinder and a ramp function slope of the proportional overflow valve; thus, the purposes of high-pressure small-slope stable pressure relief and low-pressure large-slope quick pressure relief are achieved.

Description

technical field [0001] The invention relates to the technical field of hydraulic machines, in particular to a numerically controlled pressure hydraulic system. Background technique [0002] With the increasingly wide application range of hydraulic presses, digital control technology has also been widely used in hydraulic presses. Therefore, high-end numerical control hydraulic presses also put forward higher requirements for the rapidity and stability of the slider pressure relief process. The traditional hydraulic press releases pressure by controlling the opening of the filling valve, but the hydraulic system will have an impact at high pressure and large flow; and the single linear slope pressure relief method through the proportional relief valve cannot satisfy the stable pressure relief of high pressure and low pressure at the same time. The rapid pressure release method requires that the slider will have a long time to release pressure or there will be an impact on the...

AI Technical Summary

Problems solved by technology

The traditional hydraulic press releases pressure by controlling the opening of the filling valve, but the hydraulic system will have an impact at high pressure and large flow; and the single linear slope pressure relief method through the proportional relief valve cannot satisfy the stable pressure relief of high pressure and low pressure at the same time. The rapid pressure release method requires that the slider will have a long time to release pressure or there will be an impact on the pressure release. Therefore, a design and development that can not only ensure the stable pressure relief with a small slope of high pressure, but also ensure the rapid pressure relief of a large slope with a low pressure. The pressure relief system of CNC hydraulic press is particularly important