Electro-proportional pressure continuously-adjustable hydraulic motor/pump

Abstract

An electro-proportional pressure continuously-adjustable hydraulic motor / pump is characterized in that an electromagnetic switching valve, a main-control pressure valve, a pilot proportional valve, damping holes, a displacement sensor and a proportional amplifier are additionally arranged on the basis of a variable plunger motor or a variable plunger pump. According to the hydraulic motor / pump provided by the invention, the functions of a hydraulic motor and a hydraulic pump are integrated; the working conditions of the hydraulic pump and the hydraulic motor can be switched over by controllingthe diversion of the electromagnetic switching valve and a spindle of the hydraulic motor / pump; the pressure of an oil inlet / outlet of the hydraulic motor / pump can be adjusted in real time by adjusting the set value of the pilot proportional valve and changing the swing angle of a swash plate, thereby continuously adjusting the inlet / outlet pressure of the hydraulic motor / pump; the hydraulic motor / pump is simple in structure and convenient to control, and can be combined with a motor / power generator into an electrical recycling system; accordingly, the energy of engineering machinery and thelike can be recycled without throttling loss, and the impact and vibration generated at the beginning of recycling can be inhibited; and the hydraulic motor / pump has great application prospects and popularization value.

Description

technical field [0001] The invention relates to a hydraulic motor / pump for continuous regulation, in particular to a hydraulic motor / pump for continuous regulation of electric proportional pressure, belonging to hydraulic power and actuators for electric proportional control. Background technique [0002] The plunger motor and plunger pump are one of the key components in the hydraulic transmission system. They have the advantages of compact structure, high efficiency and high pressure, and are widely used in construction machinery, mining machinery and other equipment. [0003] As a power element in the hydraulic system, the proportional constant pressure pump can control the outlet pressure to keep constant, but it can only realize the function of the hydraulic pump and cannot be used as a motor. In construction machinery, the gravitational potential energy and For the kinetic energy in the braking process of the slewing mechanism, the existing electrical recovery methods ...

AI Technical Summary

Problems solved by technology

[0003] As a power element in the hydraulic system, the proportional constant pressure pump can control the outlet pressure to keep constant, but it can only realize the function of the hydraulic pump and cannot be used as a motor. In construction machinery, the gravitational potential energy and For the kinetic energy in the braking process of the slewing mechanism, the existing electrical recovery methods are flow control or displacement control. In order to establish the torque balance at the beginning of the recovery, it is necessary to use the auxiliary method of throttling or overflow, which reduces the efficiency of energy recovery.

Such as the application of patent publication number CN105008729A, it is proposed to connect a relief valve or a throttle valve in series before recovering the variable motor to reduce the braking impact and improve the controllability of the rotary braking and the lowering of the boom. throttling or overflow losses

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