Numerical control hydraulic machine decompression system based on pressure feedback

Abstract

The invention discloses a numerical control hydraulic machine decompression system based on pressure feedback, and relates to the technical field of hydraulic machines. The numerical control hydraulic machine decompression system comprises a pressure sensor, a programmable logic controller and a proportional overflow valve, wherein the pressure sensor is used for collecting oil pressure data of a slide block main cylinder, the programmable logic controller is used for receiving the oil pressure data, dividing the oil pressure data into sections according to the oil pressure data, and outputting different linear control commands in the different sections, and the proportional overflow valve is used for regulating oil pressure in the slide block main cylinder according to the linear control commands. The pressure sensor is electrically connected with an analog quantity input port of the programmable logic controller. An analog quantity output port of the programmable logic controller is electrically connected with the proportional overflow valve. The decompression of a slide block is controlled continuously in a variable-rate mode by controlling the rate of continuous progressive decrease of the proportional overflow valve according to the corresponding relationship between the oil pressure data of the slide block main cylinder and the slope of the ramp function of the proportional overflow valve. Therefore, the aims of high-pressure and small-slope stable decompression and low-pressure and large-slope rapid decompression are achieved.

Description

technical field [0001] The invention relates to the technical field of hydraulic presses, in particular to a pressure relief system for digitally controlled hydraulic presses based on pressure feedback. 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...

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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

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