Rotary hydraulic system of excavator and control method

Abstract

The invention discloses a rotary hydraulic system of an excavator and a control method. The rotary hydraulic system of the excavator comprises a variable displacement plunger pump, an electronic-control power regulator, a first pressure sensor, a pilot pump, a central control unit, a second pressure sensor, a logic shuttle valve, a pilot valve, a reversing valve, a rotary motor, a pilot overflow valve and a main overflow valve. The control method of the system comprises the following steps of presetting a set pressure value Pm and a pilot logic signal of the main overflow valve; reading a pilot signal; comparing the pilot signal with the pilot logic signal to judge whether single rotary action is carried out, if not, keeping the original power of a main pump, or else, entering the next step; reading a pressure value P of the main pump, judging whether the pressure value P is greater than or equal to the set pressure value Pm of the main overflow valve, if not, keeping the original power of the main pump, or else, entering the next step; and adjusting the power of the main pump and reducing the discharge capacity. During the single rotary action of the excavator, the rotary hydraulic system is used for adjusting the power of the main pump, so that the energy is saved by reducing the power under the premise of satisfying the normal operation.

Description

technical field [0001] The invention relates to a hydraulic system of an excavator, in particular to an excavator rotary hydraulic system and a control method, and belongs to the technical field of construction machinery equipment. Background technique [0002] An excavator is an earth-moving machine that uses the rotation of the platform and the cooperation of the boom, arm, and bucket to excavate or move soil or materials that are higher or lower than the bearing surface, and load them into transport vehicles or unload them to the stockyard. Existing medium and large excavators with electronic control systems are all supplied with full-flow oil by the plunger pump when performing single-slewing operations. This method will cause energy waste due to large-flow overflow when the slewing starts. [0003] In recent years, users have increasingly increased requirements for the operating comfort and energy saving of construction machinery, especially excavators, and slewing is ...

AI Technical Summary

Problems solved by technology

Existing medium and large excavators with electronic control systems are supplied with full-flow oil by the plunger pump when performing single-slewing operations. This method will cause energy waste due to large-flow overflow when the slewing starts

[0003] In recent years, users have increasingly increased requirements for the operating comfort and energy saving o

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