Method for improving excavating operation characteristic and grading operation characteristic of excavator
US9518371B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 2013 |
| Grant date | Dec 13, 2016 |
| Priority date | — |
| Expiry date | May 15, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/0318
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for improving excavating operation characteristic and grading operation characteristic of an excavator is disclosed. A hydraulically controlled selector valve is added in a boom confluence control circuit of a hydraulic excavator, and a solenoid valve group is added in the boom confluence control circuit and the bucket/stick confluence control circuit. A controller sends a control signal to switch the solenoid valve group between a disconnected mode and a connected mode. The controller may send out a signal to disconnect the solenoid valve group, to restore a valve spool to a middle position, to restore a boom lifting confluence circuit, and to disconnect a bucket/stick swinging confluence circuit to perform a standard excavation mode. The controller may send out a signal to connect the solenoid valve group to disconnect a boom lifting confluence circuit and to increase a bucket/stick swinging confluence circuit to achieve a grading operation mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.