Electric-hydraulic proportional load-sensitive pump and pump valve joint control servo system

Abstract

The invention discloses an electric-hydraulic proportional load-sensitive pump and a pump valve joint control servo system. The electric-hydraulic proportional load-sensitive pump mainly comprises anend cap, a shell, a valve bush, a valve element, a pressure adjusting spring, a push rod, a proportion electro-magnet, a reset spring, a swash plate and a control piston. The work pressure PS of an outlet of the load-sensitive pump keeps constant differential pressure changes along with a load PL, the constant differential pressure can be adjusted through the proportion electro-magnet, the differential pressure adjusting response is fast, and the dynamic response speed of the electric-hydraulic proportional load-sensitive pump can be greatly increased. The pump valve joint control servo systemis free of overflow loss, and the work efficiency of the pump valve joint control servo system can be greatly improved while the high-frequency dynamic characteristic is met.

Description

technical field [0001] The invention relates to the field of hydraulic servo control systems, in particular to an electro-hydraulic proportional load sensitive pump and a pump valve joint control servo system. Background technique [0002] The pump-valve joint control servo system is an important branch of power transmission. It can fully combine the advantages of both the pump control servo system and the valve control servo system, and abandon the corresponding shortcomings. It is an ideal electro-hydraulic servo system. Therefore It is also a hotspot and focus of research by international experts. [0003] At present, the load sensing pump has two modes of manual and electric control. Among them, for the manual load sensing pump, the outlet pressure P is manually adjusted. S and load pressure P L It is impossible to realize the remote automatic adjustment of the pressure difference. When the initial pressure difference is adjusted to a large value, the purpose of energ...

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Problems solved by technology

[0003] At present, the load sensing pump has two modes of manual and electric control. Among them, for the manual load sensing pump, the outlet pressure P is manually adjusted. S and load pressure P L The pressure difference value can not realize the remote automatic adjustment of the pressure difference value

When the initial pressure difference is adjusted to a large value, the purpose of energy saving cannot be achieved; when the initial pressure difference is adjusted to the minimum, although the system work efficiency can be improved, but the dynamic response speed of the load sensitive pump is slow, resulting in Less than the purpose of the dynamic frequency response of the valve control servo system

[0004] For the electronically controlled load-sensing pump, the pressure sensor is used to collect the load signal, and the controller directly drives the electromagnetic proportional valve output force to compare with the outlet pressure of the load-sensing pump to form a constant pressure difference. It can also be adjusted, but the outlet pressure of the load-sensitive pump is relatively large, and the force is also large, while the output force of the electromagnetic proportional valve is limited, which cannot form a good acceleration performance, thereby affecting the response speed of adjusting the constant pressure difference value, that is, affecting the load-sensitive Dynamic Response of the Pump

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