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:
Sep. 17, 2024
Filed:
Dec. 03, 2020
Xuzhou Xugong Foundation Construction Machinery Co., Ltd., Xuzhou, CN;
Yonghua Zhang, Xuzhou, CN;
Yu Sun, Xuzhou, CN;
Zhigang Liu, Xuzhou, CN;
Changmeng Shan, Xuzhou, CN;
Hongchen Qiu, Xuzhou, CN;
Xiafang Gao, Xuzhou, CN;
Xing Gao, Xuzhou, CN;
Junyun Shan, Xuzhou, CN;
Qianbin Geng, Xuzhou, CN;
Abstract
A main winch system of a rotary drilling rig includes a main action loop, a pilot control loop, and a feedback control loop. The main action loop includes an engine, a hydraulic pump, a main control valve, a balance valve, a main winch motor, and an oil tank. The pilot control loop includes a pilot handle, a solenoid valve I, a pressure relay, and the main control valve in the main action loop. The feedback control loop includes a solenoid valve II and the hydraulic pump and the main control valve in the main action loop. In response to a lifting action of the pilot handle for the main winch, under the control of a button, the solenoid valve II is energized continuously, and the solenoid valve I is energized and de-energized according to a given rule.