Compact swash plate type electric proportional axial plunger pump and control method thereof

Abstract

The invention discloses a compact swash plate type electric proportional axial plunger pump, comprising an electric proportional control valve (1) and a pump body, wherein the electric proportional control valve (1) is connected with a proportional electromagnet (7), the pump body is connected with a swash plate (6), the electric proportional control valve (1) is arranged at one side of the swash plate (6), and a return spring (5) is arranged at the other side, relative to the electric proportional control valve (1), of the swash plate (6). The control method is as follows: when an electric signal is input to the proportional electromagnet, a thrust force from the proportional electromagnet and a feedback force produced by rotating of the swash plate are applied to left and right sides of a valve core of the electric proportional control valve respectively, so that the valve core of the electric proportional control valve keeps a dynamic equilibrium, and the swash plate is also located at a swing angle corresponding to the electric signal. According to the invention, the overall size of the plunger pump can be reduced, and high compactness is achieved; and all oil lines can be arranged in a pump shell, so that the size can be further reduced.

Description

technical field [0001] The invention relates to a swash plate type variable displacement plunger pump, in particular to a compact swash plate type electric proportional axial plunger pump and a control method thereof. Background technique [0002] The swash plate electric proportional axial piston pump is a commonly used hydraulic power component, and its displacement can be controlled by changing the magnitude of the input proportional electromagnet current. At present, the existing swash plate type electric proportional variable plunger pumps of construction machinery generally achieve the purpose of changing the inclination angle of the swash plate by setting an oil cylinder at both ends of the swash plate and controlling the flow of oil into or out of the two oil cylinders through an electric proportional control valve. The conventional two oil cylinders are respectively two oil cylinders that push the swash plate to swing. The two oil cylinders are in direct contact wit...

AI Technical Summary

Problems solved by technology

However, the layout of the two oil cylinders of the existing swash plate electric proportional plunger pump restricts the possibility of miniaturization of the plunger pump structurally, which is not conducive to the miniaturization requirements of construction machinery

In addition, the conventional electric proportional displacement control pump, its control oil circuit needs to be installed outside the pump body in the form of oil pipe, which is not conducive to the installation and transportation of construction machinery

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