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.

公开(公告)号：US10385692B2

公开(公告)日：2019-08-20

申请号：US16088452

申请日：2016-12-01

Applicant: China University of Mining and Technology

Inventor： Jixiong Zhang ,  Qiang Zhang ,  Yanlong Chen ,  Kai Quan ,  Hao Yan

IPC: E21D15/502 ,  E21D15/02 ,  E21D15/54 ,  E21D15/50 ,  B66F3/22 ,  B66F3/12

Abstract: An apparatus for pre-loading a mechanical constant-resistance single prop includes a rhombic stretchable bracket, a screw rod, a first cylindrical sleeve ring, and a second cylindrical sleeve ring. The screw rod is connected to two opposite apex corners of the rhombic stretchable bracket. A tail end of the screw rod is fixedly connected to one apex corner of the rhombic stretchable bracket. An end head of the screw rod passes through another apex corner of the rhombic stretchable bracket. The remaining two opposite apex corners of the rhombic stretchable bracket are respectively fixedly connected to edges of the first cylindrical sleeve ring and the second cylindrical sleeve ring through connecting rods. The screw rod is threadedly connected to the apex corner of the rhombic stretchable bracket through which the screw rod passes. A method for pre-loading a mechanical constant-resistance single prop is also provided.