Excavator stick action hydraulic control system and method

Abstract

The invention provides a hydraulic control system and a hydraulic control method for action of a bucket rod of an excavator. The problem that the existing bucket rod is high in power consumption during compound control action is solved. The hydraulic control system comprises a bucket rod oil cylinder, a moving arm oil cylinder, a bucket oil cylinder, a main pump, an auxiliary pump, a pilot pump, a bucket rod handle, a moving arm handle and a bucket handle, wherein the pilot pump is connected with the bucket rod handle through a pilot oil line; the bucket rod handle is connected with a bucket rod valve through an executing oil line; a detecting oil line is connected with a pressure detecting valve bank; a first signal branch of the pressure detecting valve bank is connected with a feedback opening of the main pump; a second signal branch acts on a switching end of a bucket rod flow collecting valve; a third signal branch is connected with a feedback opening of the auxiliary pump and is serially connected with a two-position three-way reversing valve; and a pressure oil line acts on a switching end of the two-position three-way reversing valve and is connected with a composite action detecting valve bank. During composite action of the bucket rod, pressure on the feedback opening of the auxiliary pump is cut off, the single pump supplies oil for the bucket rod oil cylinder, oil consumption is reduced, and the work efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of excavators, and relates to an energy-saving mode of an excavator arm in compound actions, in particular to an excavator arm action hydraulic control system and method. Background technique [0002] When the excavator is controlled by the existing main valve, in the hydraulic system, in order to improve the working efficiency and speed up the excavation action, the stick is generally used to realize the double pump confluence when excavating or unloading. Moreover, whether the stick is in single action or combined action, the output flow of pump 1 and pump 2 will be combined and then supplied to the stick cylinder. [0003] Since the excavator has a confluence function when the stick moves, that is, oil is supplied by two pumps, so when the action of "full-speed action of the stick + full-speed lowering of the boom", the flow required by the boom cylinder is provided by pump 2, and the flow required by the...

AI Technical Summary

Problems solved by technology

But in fact, only 203L / min of oil is supplied to the stick at this time, but the output flow of pump 1 (168L / min) is all supplied to the stick, and only a small part of the output flow of pump 2 (35L / min) is supplied to the bucket Rod, the remaining 123L / min flow returns to the fuel tank through the bypass oil circuit, and this part of the excess flow increases fuel consumption, and the lost power becomes heat, which increases the burden on the cooling system

That is to say, it causes energy loss and unnecessary heating, and wastes a part of fuel consumption

[0005] According to the test data, at the same time, there is a phenomenon that the energy loss of the pump 2 is relatively large when the "stick moves at full speed + the boom moves at 0-100%" and "the stick moves at full speed + the bucket moves at 0-100%".

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