Closed pump control single out rod hydraulic cylinder static and dynamic flow real-time matching system

Abstract

The invention relates to a closed pump control single out rod hydraulic cylinder static and dynamic flow real-time matching system, and belongs to electrohydraulic control systems. A servo motor and avariable displacement asymmetric gear pump are coaxially connected, a first working oil opening of the variable displacement asymmetric gear pump is connected with a rodless cavity of a single out rod hydraulic cylinder, a second working oil opening of the variable displacement asymmetric gear pump is connected with a rod cavity of the single out rod hydraulic cylinder, and a third working oil opening of the variable displacement asymmetric gear pump is connected with an energy accumulator; and the energy accumulator is communicated with oil inlets of a first one-way valve and a second one-way valve and oil outlets of a first overload valve and a second overload valve, an oil outlet of the first one-way valve is communicated with the rodless cavity of the single out rod hydraulic cylinder, an oil outlet of the second one-way valve is communicated with the rod cavity of the single out rod hydraulic cylinder, an oil inlet of the first overload valve is communicated with the rodless cavity of the single out rod hydraulic cylinder, and an oil inlet of the second overload valve is communicated with the rod cavity of the single out rod hydraulic cylinder. According to the closed pump control single out rod hydraulic cylinder static and dynamic flow real-time matching system, asymmetric flow generated by differential motion cylinder area difference can be compensated, and flow dynamic matching between the single out rod hydraulic cylinder and the asymmetric gear pump is achieved.

Description

technical field [0001] The invention relates to a control loop of a closed pump-controlled single-rod hydraulic cylinder, belonging to an electro-hydraulic control system. Background technique [0002] Electro-hydraulic control technology has two categories: valve control and pump control. At present, valve control is widely used, but there is a large throttling loss, low energy efficiency, and system heating. If a cooling device is added, the installed power and cost of the system will be further increased, and the heat may cause failure. The valve control system is an open circuit, the oil consumption is large, and pollution will be generated when the waste oil is disposed of. [0003] Using valveless pump direct control technology, it is necessary to pre-tighten the two chambers of the hydraulic cylinder in the same way as the valve control principle, so as to solve the problem of balancing the asymmetric flow of the differential cylinder. Contents of the invention ...

AI Technical Summary

Problems solved by technology

At present, valve control is widely used, but there is a large throttling loss, low energy efficiency, and heat generation in the system. If a cooling device is added, the installed power and cost of the system will be further increased, and the heat may cause failure.

The valve control system is an open circuit, the amount of oil used is large, and pollution will be generated when the waste oil is disposed of

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