Energy regeneration system of excavator and excavator

Abstract

The invention discloses an energy regeneration system of an excavator and the excavator. The system comprises a main hydraulic oil line, a pilot hydraulic oil line, a pilot pump, a first pump, a second pump, an engine, a first sensor, a second sensor, an electromagnetic valve, a main controller, an operation handle, a movable arm oil cylinder, a first movable arm valve core, a first stick valve core, a switch valve, a one-way valve, a second stick valve core, a second movable arm valve core, a stick oil cylinder and a hydraulic oil tank, wherein the pilot pump, the first pump, the second pump and the engine are sequentially connected, the first pump is connected with the main controller through the first sensor, the second pump is connected with the main controller through the second sensor, the first stick valve core is respectively connected with the second pump, the second movable arm valve core and the one-way valve, the one-way valve, the switch valve and the first movable arm valve core are sequentially connected, and the movable arm oil cylinder is sequentially connected with the second movable arm valve core and the first movable arm valve core. The system has the advantages that the working efficiency of the excavator is improved, the fuel consumption is reduced, and the operation convenience of the integral excavator is improved.

Description

technical field [0001] The invention belongs to the energy recovery and regeneration utilization technology of large machinery, and relates to an energy regeneration system of an excavator and the excavator. Background technique [0002] Among the current construction machinery, the use of excavators has been greatly promoted and applied, and its fuel consumption, work efficiency and ease of operation are the main concerns of various main engine manufacturing companies, R&D institutions and customers. During the operation of the excavator, the frequent movements of the boom, stick and other components, coupled with the inertial motion produced by their own weight, lead to the loss of hydraulic energy, and at the same time increase the oil temperature of the hydraulic system, thereby reducing the life of the hydraulic components. The work efficiency is improved, the fuel consumption rate is improved, and the operation convenience of the whole machine is further reduced. In o...

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Problems solved by technology

[0004] However, in the actual work of the excavator, in order to improve the work efficiency and the convenience of operation, the compound action of the boom and the stick is the most frequent.

When the boom is lowered and the stick is excavated at the same time, the surplus hydraulic oil in the large cavity of the boom cylinder returns to the oil tank, resulting in a waste of energy, and the hydraulic oil regenerated from the small cavity of the stick cylinder to the large cavity of the cylinder cannot meet the requirements of the large cavity of the cylinder. Requirements, the main pump needs to provide hydraulic oil; and when the boom is lifted and the stick is excavated at the same time, especially when the pilot pressure of the stick is relatively high (that is, the stick needs to be quickly excavated), the hydraulic oil in the small cavity of the boom cylinder All the oil is returned to the oil tank, and the hydraulic oil in the small chamber of the stick cylinder is regenerated to the large chamber of the cylinder, and together with the hydraulic oil provided by the main pump, hydraulic oil is provided for the action of the stick

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