Hydraulic system of quick pressing type hydraulic press

Abstract

The invention relates to a hydraulic system of a quick pressing type hydraulic press. The hydraulic system comprises a main oil cylinder, quick cylinders, a servo motor pump set and an energy storing device, wherein the lower end of the main oil cylinder is connected to the upper end of the middle of a slide block, and the quick cylinders are mounted at the upper ends of two sides of the slide block; the upper end of the main oil cylinder is connected to a downward-pressing oil feeding pipeline; the upper end of each quick cylinder is connected with a quick oil discharging channel while the lower end of each quick cylinder is connected with a returning oil channel; the quick oil discharging channel communicates with the downward-pressing oil feeding pipeline; a liquid filling valve is mounted at the upper end of the main oil cylinder, and the upper end of the liquid filling valve is connected to an oil tank; the lower end of a reversing valve is mounted at the outlet end of the servo motor pump set, and the upper end of the reversing valve is connected to the downward-pressing oil feeding pipeline and the returning oil channel; the energy storing device is connected to the outlet end of the servo motor pump set through an auxiliary pipeline; a proportional valve is mounted on the auxiliary pipeline, and the auxiliary pipeline is connected to the liquid filling valve through a control pipeline; a first solenoid valve is mounted on the control pipeline. The system has the advantages that the quick pressing is achieved, overhigh installed power is not configured, the control precision is high, the flexible starting, stopping and pressure releasing control functions are achieved, and the quick running speed of the slide block is increased.

Description

technical field [0001] The invention relates to the field of hydraulic systems of hydraulic presses, in particular to a hydraulic system of rapid pressing hydraulic presses. Background technique [0002] At present, the hydraulic press uses a motor to drive the oil pump to press at a slow speed. For the press that needs to press fast, it needs to be equipped with a high installed power. This kind of press with a similar process often only uses the maximum power during the pressing to the final mold clamping stage. Therefore, Device power efficiency is low. Ordinary compressors still use ordinary three-phase asynchronous motors as power sources. Although this motor works stably and has a long life, its efficiency is low and it also loses power during empty cycles, so it does not meet the current requirements for energy saving and emission reduction. Therefore, the use of servo motor drive will be a major trend at present. Ordinary press systems are mostly controlled by swit...

AI Technical Summary

Problems solved by technology

Ordinary compressors still use ordinary three-phase asynchronous motors as power sources. Although this motor works stably and has a long life, its efficiency is low and it also loses power during empty cycles, so it does not meet the current requirements for energy saving and emission reduction. Therefore, the use of servo motor drive will be a major trend at present

Ordinary press systems are mostly controlled by switches, and there are large response delays and switching shocks. Using servo motors to drive oil pumps does not have the above two problems.

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