公开(公告)号：US20200240269A1

公开(公告)日：2020-07-30

申请号：US16756082

申请日：2019-03-12

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Yanlong Chen ,  Hai Pu ,  Feng Ju ,  Kai Zhang ,  Yu Wu ,  Ming Li ,  Jiangfeng Liu ,  Peng Wu ,  Jincheng Fan ,  Zhiwei Feng

IPC: E21D15/58 ,  E21D15/60

Abstract: A mechanical constant-resistance single prop continuous prop lifting pre-tightening device, structurally composed of a continuous prop lifting device, a pressurizing system, an oil supply line and a monitoring unit. The continuous prop lifting device is a core component, comprising a hydraulic cylinder, a prop barrel clamping sleeve ring and a prop rod clamping sleeve ring. The prop rod clamping sleeve ring is fixedly connected with a piston rod of the hydraulic cylinder by means of a cylinder head seat, and the prop barrel clamping sleeve ring is fixedly connected with a cylinder body of the hydraulic cylinder. With continuous pressurization of the pressurizing system, a cohesion occurs between the continuous prop lifting device and a prop rod, so that the prop rod of a single prop is lifted up to come into contact with a top plate and provide a pre-tightening force.