Multifunctional energy recovery device and hydraulic excavator system carrying same

Abstract

The invention discloses a multifunctional energy recovery device and a hydraulic excavator system carrying the same, and belongs to the technical field of engineering mechanical hydraulic systems. A cartridge valve unit module comprises a cover plate type cartridge valve, the cover plate type cartridge valve is provided with a cavity C and a cavity D; an oil inlet of the cover plate type cartridgevalve is connected with a hydraulic system to recover energy; a valve controlling unit module comprises a two-position three-way control valve, the cavity C and the cavity D of the cover plate type cartridge valve communicate with each other through the two-position three-way control valve; a load-sensitive unit module comprises a compensation valve and a main valve; the compensation valve is connected between an oil outlet of the cover plate type cartridge valve and the oil inlet of the main valve; the oil outlet of the main valve is connected with an energy accumulator. According to the multifunctional energy recovery device and the hydraulic excavator system carrying the same, the cover plate type cartridge valve adopts the internal control and external discharge oil-way control form,so that the load holding function of the cover plate type cartridge valve is ensured; the load-sensitive oil-way structure is adopted, so that the stability of the oil-way oil liquid is effectively controlled, the flow fluctuation and hydraulic impact of the oil liquid is reduced, and an effective and stable energy recovery is formed.

Description

technical field [0001] The invention relates to the technical field of engineering machinery hydraulic systems, in particular to a multifunctional energy recovery device for energy recovery of a hydraulic system and a hydraulic excavator system equipped with the device. Background technique [0002] Construction machinery, especially large and ultra-large construction machinery, has high fuel consumption and serious energy waste; energy saving, consumption reduction and efficiency improvement have become new directions for the development of construction machinery; energy saving and consumption reduction have become important assessment indicators for construction machinery; energy recovery devices are The market competition of construction machinery provides a strong guarantee. [0003] In the prior art, a Chinese patent discloses an excavator hydraulic energy recovery device (CN105220730A). This excavator hydraulic energy recovery device includes an energy recovery control...

AI Technical Summary

Problems solved by technology

[0005] 1. Relying on the recovery of the braking and buffering energy of the rotary motor, the energy recovery is limited, and the recovered energy cannot effectively drive other actuators, and can only be used as the pilot driving energy;

[0006] 2. Relying on the recovery of the braking buffer energy of the slewing motor, the oil circuit is equipped with a pressure control valve, so that the slewing buffer energy cannot be recovered effectively, that is, the motor braking buffer energy cannot be fully recovered;

[0007] 3. The structure of the oil circuit is complicated, the control oil circuit is cumbersome, difficult to process, there are many parts, and the assembly process is cumbersome and complicated; it is not easy to test and troubleshoot

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