Jack device for automatically controlling separation trend of roadway roof

• Main Authors: ZHANG DEZHI, ZHOU WENYING, XU XIAOLIAN, XU HONGSHAN, YUAN QIANGGUO
• Format: Patent
• Language: Chinese; English
• Published: 16.05.2023
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; HAULING; HEATING; HOISTING; HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDEDFOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCEDIRECTLY TO THE SURFACE OF A LOAD; HYDRAULICS OR PNEUMATICS IN GENERAL; LIFTING; LIGHTING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; TRANSPORTING; WEAPONS

The invention discloses a jack device for automatically controlling the separation trend of a roadway roof, which comprises a jack and a hydraulic control system, and the jack comprises a lug ring, and an outer cylinder body, a second-stage cylinder body and a third-stage cylinder body which are coa...