Electric-hydraulic proportion regulation and control system for hydraulic machine

Abstract

The invention relates to the technical field of hydraulic machines, and in particular relates to an electric-hydraulic proportion regulation and control system for a hydraulic machine. The system adopts a proportional velocity regulating valve to control the oil inlet amount of a main cylinder when a sliding block descends, thereby achieving the aim of controlling the descending velocity of a bad block; meanwhile, the system adopts a proportional pressure-reducing valve to control the oil pressure at the oil inlet of a top cylinder, thereby controlling a blank holder force provided by a blank holder; the system sliding block displacement information is acquired by a grating ruler displacement sensor and then fed back to a PC through an A / D converter; meanwhile, the oil inlet flow at the main cylinder is monitored through a flow sensor, and the flow is fed back to the PC through the A / C converter; the blank holder force information provided by the system blank holder is acquired through a top cylinder pressure sensor and then fed back to the PC through the A / D converter; meanwhile, a main cylinder pressure sensor monitors the pressure at the oil inlet of the top cylinder, and the pressure is fed back to the PC through the A / D converter; and a pressure control loop and a top cylinder pressure sensor control loop form a closed-loop control system of the blank holder force.

Description

technical field [0001] The patent of the present invention relates to the technical field of hydraulic machines, in particular to a hydraulic electro-hydraulic proportional adjustment control system. Background technique [0002] The hydraulic press is one of the necessary equipment for sheet metal forming. It provides the pressure required for forming through the hydraulic system and acts on the mold to form the metal sheet into various parts. The conventional single-acting hydraulic press can only control the moving speed of the slider at a constant speed, and cannot control the blank-holding force through the press; while in the plastic forming of sheet metal, the stamping speed and blank-holding force are important factors affecting the forming performance of the sheet metal. Factors; when the stamping speed is too high, the strength increase caused by work hardening has not yet reached the maximum value, but it will be exceeded by the rapidly rising stress, which causes...

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Problems solved by technology

[0004] The present invention proposes a hydraulic electro-hydraulic proportional adjustment control system, the purpose of which is to solve the problem that the existing hydraulic press control system cannot provide variable stamping speed and variable blank-holding force control. Speed ​​and blank holder force for stamping, and realize precise control of stamping speed and blank holder force through closed-loop control

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