The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 13, 2016
Filed:
Jul. 02, 2013
Xcmg Excavator Machinery Co., Ltd, Xuzhou, CN;
Yong Wang, Xuzhou, CN;
Hong Zhang, Xuzhou, CN;
Shengxia Zhang, Xuzhou, CN;
Kai Liu, Xuzhou, CN;
Zong Li, Xuzhou, CN;
Jian Zhang, Xuzhou, CN;
Mingjun Liao, Xuzhou, CN;
Jiasheng Qin, Xuzhou, CN;
Yufeng Yang, Xuzhou, CN;
XCMG EXCAVATOR MACHINERY CO., LTD, Xuzhou, CN;
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.