A hydraulic excavator stick regeneration device and hydraulic excavator

Abstract

The invention discloses a hydraulic excavator and a bucket rod regenerating device thereof. A rod cavity and a rodless cavity of a hydraulic cylinder are connected with a multi-way valve; the rod cavity passes through the multi-way valve to further connect with a regeneration relief valve and a regeneration check valve; on and off of the regeneration relief valve determine capacity of hydraulic oil returning from the rod cavity to an oil tank, and the regeneration check valve is opened to provide regeneration hydraulic oil for the rodless cavity after hydraulic oil pressure reaches an openingset pressure; an oil inlet of a plunger pump is positioned in the oil tank, hydraulic oil is pumped from the oil tank to be outputted to the multi-way valve, and the multi-way valve and the regeneration check valve jointly provide appropriate hydraulic oil for the rodless cavity. In bucket rod recovery, a load drives a bucket rod piston rod to fall down, then the rod cavity outputs hydraulic oil to the multi-way valve, and the hydraulic oil passing through the multi-way valve is distributed to the rodless cavity and the oil tank through the regeneration check valve and the regeneration reliefvalve jointly. Emptying of the rodless cavity of the hydraulic cylinder can be prevented, hydraulic oil regeneration is realized, and integral fuel consumption of the excavator is reduced.

Description

technical field [0001] The invention relates to the technical field of hydraulic excavator oil regeneration, in particular to a hydraulic excavator arm regeneration device and a hydraulic excavator. Background technique [0002] At present, the hydraulic system of the hydraulic excavator mainly adopts the positive flow hydraulic system, the negative flow hydraulic system and the load sensing system. During the work of the excavator, there are operations of retracting and swinging the stick. In the flow control system, the stick regeneration function will be used in the retraction action of the stick. [0003] Traditional stick regeneration needs to cooperate with the multi-way valve spool to adjust the flow capacity to realize the back pressure of the rod cavity of the stick cylinder, so as to prevent the oil from returning to the rod cavity when the stick is extended. The rod cavity is empty; therefore, when the stick touches the ground, the regeneration is canceled, but t...

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Problems solved by technology

[0003] Traditional stick regeneration needs to cooperate with the multi-way valve spool to adjust the flow capacity to realize the back pressure of the rod cavity of the stick cylinder, so as to prevent the oil from returning to the rod cavity when the stick is extended. The rod cavity is empty; therefore, when the stick touches the ground, the regeneration is canceled, but the equivalent damping of the multi-way valve spool still exists, causing unnecessary pressure loss, which in turn increases the fuel consumption of the excavator

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