Hydraulic excavator and hydraulic device for preventing excavator from lowering down on flat ground

Abstract

The invention provides a hydraulic excavator and a hydraulic device for preventing the excavator from lowering down on a flat ground. The hydraulic excavator comprises the hydraulic device for preventing the excavator from lowering down on the flat ground, wherein the hydraulic device is mounted on a hydraulic oil channel of the hydraulic excavator and comprises a two-position three-way reversing valve and a piston, wherein the two-position three-way reversing valve comprises a valve body and a valve element; a first through port, a second through port, a third through port and an end port are formed in the valve body; the first through port communicates with a bucket rod control oil channel of the hydraulic oil channel and a bucket rod pilot handle control oil channel; the third through port communicates with an oil tank; the end port communicates with a movable arm control oil channel of the hydraulic oil channel and a movable arm pilot handle control oil channel; the piston comprises a cylinder body, and a piston body mounted in the cylinder body; a first oil port and a second oil port are correspondingly formed in two ends of the cylinder body; the first oil port communicates with the second through port, and the second oil port communicates with the oil tank.

Description

technical field [0001] The invention relates to an excavator, in particular to a hydraulic excavator and a hydraulic device for preventing the excavator from nodding flatly. Background technique [0002] In the current excavator system, when the excavator is operating on a level ground, due to the relatively large load of the boom and the relatively light load of the arm, the arm will sink at the moment of starting, that is, the arm nods, especially on flat and soft ground. This phenomenon is especially obvious at this time, which seriously affects the performance of the excavator. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a hydraulic excavator capable of eliminating the flat nodding of the excavator and a hydraulic device for preventing the excavator from flat nodding, so as to overcome the above-mentioned defects in the prior art. [0004] In order to achieve the above object, the present invention provi...

AI Technical Summary

Problems solved by technology

[0002] In the current excavator system, when the excavator is operating on a level ground, due to the relatively large load of the boom and the relatively light load of the stick, the stick will sink at the moment of starting, that is, the stick nodding phenomenon, especially on flat and soft ground. This phenomenon is particularly obvious, which seriously affects the performance of the excavator.

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