公开(公告)号：US20240026788A1

公开(公告)日：2024-01-25

申请号：US18197894

申请日：2023-05-16

Applicant: Shandong University of Science and Technology

Inventor： Lirong Wan ,  Xiaoqi Ma ,  Qingliang Zeng ,  Zhiyuan Sun ,  Wenqian Xu ,  Zhaoji Li ,  Yanpeng Zhu ,  Baolong Chen

IPC: E21D23/04 ,  E21D23/00 ,  E21D23/16 ,  E21F17/18

CPC classification number: E21D23/0427 ,  E21D23/0047 ,  E21D23/0069 ,  E21D23/16 ,  E21F17/18

Abstract: The present disclosure relates to a hydraulic support with a quick response function for coal wall spalling, which includes a base, an upright post, a top beam, an extensible canopy, a face guard, and a vibration meter. The vibration meter is mounted on a hydraulic support, and detects a vibration signal of a coal wall in a non-contact mode. The face guard includes a primary face guard, a secondary face guard, and a tertiary face guard connected in sequence. One side, close to a coal wall, of the primary face guard is connected to a quick response device. The quick response device is in signal communication with the vibration meter. After receiving the vibration signal of the coal wall, the quick response device is abutted against the coal wall before the secondary face guard and the tertiary face guard fit the coal wall.

公开(公告)号：US11913479B2

公开(公告)日：2024-02-27

申请号：US17781439

申请日：2021-04-30

Applicant: SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Lirong Wan ,  Xuehui Yu ,  Dejian Ma ,  Jiantao Wang ,  Fengwen Xin ,  Zhaoji Li ,  Guoqing Qi ,  Baolong Chen

IPC: F15B15/20 ,  F15B15/22 ,  F15B15/17

CPC classification number: F15B15/17 ,  F15B15/20 ,  F15B15/204 ,  F15B15/22

Abstract: An impact-resistant balanced hydro-cylinder with pressure relief and buffering protection comprises a cylinder body (11), a piston (13), a piston rod (14), and a first valve core (21) and a second valve core (51) slidable relative to the cylinder body (11). A closed first gas cavity (22) and a closed second gas cavity (52) are respectively formed between the two valve cores and inner walls of two opposite ends of the cylinder body (11). A closed first oil cavity (32) and a closed second oil cavity (42) are respectively formed between the two valve cores and two end faces of the piston (13). A through hole (33) for the first oil cavity and a through hole (43) for the second oil cavity are respectively provided in the positions on the cylinder body (11) corresponding to the first oil cavity (32) and the second oil cavity (42).