A high-precision electric proportional control axial piston pump device and control method

Abstract

The invention discloses a high-precision electric proportional control axial plunger pump device and a control method, which comprise an electric proportional control valve (3) and a main pump body with an oil suction port (S) and a working oil port (B). The variable cylinder small end (M) and variable cylinder large end (N) of the main pump body are connected to the electric proportional control valve (3), and the electric proportional control valve (3) is connected in parallel with a pressure cut-off valve (19). The electromagnet converts the input signal into the thrust of the magnetic rod, and establishes a balanced relationship between the electromagnetic force at both ends of the electric control valve core and the compression force generated by the feedback spring due to the rotation of the swash plate, and continuously adjusts the displacement according to the change of the current. Proportional regulation. The invention not only can realize the stable and accurate control of the displacement of the main pump, but also has simple structure and strong anti-interference performance.

Description

Technical field [0001] The invention relates to a power equipment, in particular to a high-precision electric proportional control axial plunger pump device and a control method. Background technique [0002] In hoisting and slewing machinery, in order to satisfy the host's accurate control of the output flow of the main pump, especially to avoid the impact of system pressure and flow during the start-up phase of the host's actions, the accurate control of the main pump swash plate swing angle is extremely important; The control valve can accurately control the displacement of the main pump. At present, the existing slant-axis proportional piston pump flow distribution structure will produce large flow pulsation and pressure pulsation, which has a large interference to the control and the variable mechanism is complex and large. The swash plate type is common The electro-hydraulic proportional pump uses single-cylinder displacement feedback, the pressure in the cylinder is very l...

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Problems solved by technology

[0002] In hoisting and slewing machinery, in order to meet the accurate control of the output flow of the main pump by the main engine, especially in order to avoid the impact of system pressure and flow during the start-up stage of the main engine, it is extremely important to accurately control the swash plate swing angle of the main pump; The control valve can accurately control the displacement of the main pump. At present, the existing inclined-axis proportional plunger pump flow distribution structure will produce large flow and pressure fluctuations, which will greatly interfere with the control and the variable mechanism is complex and huge. The common swash plate type The electro-hydraulic proportional pump uses single-cylinder displacement feedback, the pressure in the cylinder is very low, and the control accuracy is easily interfered by the oil return pressure of the casing, and the accuracy is poor

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