Composite variable pump and hydraulic control system using composite variable pump

Abstract

The invention discloses a variable pump with load sensitive throttle control and volume control functions and a hydraulic control system using the composite variable pump. The composite variable pump comprises a shell, a pump body, a variable control hydrocylinder and an electromagnetic proportioning valve, wherein the electromagnetic proportioning valve is connected with a displacement valve in parallel; a constant-pressure control valve is connected between an oil outlet of the pump body and the electromagnetic proportioning valve; a flow control valve is connected between the oil outlet of the pump body and the constant-pressure control valve; and a control side of the flow control valve is connected with a load feedback oil port X. The hydraulic control system using the composite variable pump comprises a controller, the composite variable pump, a plurality of hydraulic actuating elements and a plurality of load sensitive valves. The composite hydraulic pump can enable the system to work in the volume control mode or load sensitive throttle control mode; the actions of the actuating mechanisms do not interfere with each other; and thus, the system has the advantages of higher efficiency and more energy saving.

Description

technical field [0001] The invention relates to the technical field of hydraulic control, in particular to a variable displacement pump integrating the functions of load-sensitive throttling control and volume control, and a hydraulic control system using the variable displacement pump and a compound variable displacement pump. Background technique [0002] With the development and progress of equipment manufacturing technology, the main engine has higher and higher requirements on the hydraulic system in terms of light weight, energy utilization efficiency, and multi-executive component composite operation. In the current hydraulic system, the variable pump volume control system and the load sensitive throttling control system have been widely used due to their own unique advantages. [0003] The principle of a typical variable pump volume control system is as follows: figure 1 shown. The electric proportional displacement pump 20 sucks oil from the oil tank 10 and suppli...

AI Technical Summary

Problems solved by technology

[0004] However, there is a disadvantage in the variable pump volume control system. At any time, one pump can only correspond to one working actuator. In other words, for multiple actuators to act in combination, each actuator requires a separate pump to control.

When there are multiple actuators, multiple hydraulic pumps are required, increasing design and manufacturing costs

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