Hydraulic drives and systems

Abstract

The invention discloses a hydraulic drive device and a system. The hydraulic drive device includes a hydraulic pump, an accumulator, and a control unit, wherein the hydraulic pump pumps hydraulic fluid from the accumulator into the hydraulic output line; the accumulator is connected to the hydraulic output line through the energy storage line, and the flow rate is set in the energy storage line Control device; the control unit controls the flow control device to adjust the flow of hydraulic fluid passing through the energy storage circuit according to the operating conditions. In a hydraulic drive system, the hydraulic output lines are connected to one or more hydraulic actuators. Therefore, the hydraulic drive device and system of the present invention can adjust the flow rate and pressure of the hydraulic fluid passing through the energy storage line in real time according to the operating conditions, improve work efficiency, save energy consumption, and improve pressure accuracy.

Description

Technical field [0001] The present invention relates to the technical field of hydraulic driving, in particular to hydraulic driving devices and systems. Background technique [0002] In order to achieve predetermined actions in mechanical equipment, hydraulic drives are often used. For example, on an injection molding machine, after closing the mold, it is necessary to inject the heated and melted plastic into the cavity of the mold. Then, it is necessary to maintain the pressure to maintain the position of the injection hydraulic actuator for a period of time, wait for the injection molded part to cool in the cavity and then open the mold to take out the part, and then close the mold for the next injection. Therefore, in the injection molding machine, it is necessary to realize the actions of injection, mold closing and mold opening, and these actions can be realized by hydraulic driving devices. However, each action has different requirements for the required hydraulic flow ...

AI Technical Summary

Problems solved by technology

[0005] However, in the existing hydraulic system, as long as the pressure of the hydraulic system is greater than the accumulator, the hydraulic oil will enter the accumulator, even when it is necessary to drive a hydraulic actuator (such as a hydraulic cylinder or a hydraulic motor), the hydraulic oil will It will still be injected into the accumulator, so part of the hydraulic oil originally needed for the hydraulic actuator may be stored in the accumulator, causing the hydraulic actuator to respond slowly and it is difficult to meet the expected requirements

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