Sequential mining is utilized in the fully-mechanized face in Sihe mine. 7200/23/38A chocksupport is used in entry, some problems on its usage and related improvement opinions are put foreward.
The application prospect of plus-in valve in hydraulic support was studied. A chock-type hydraulic support equipped plus-in valve was designed, and the working principle was analyzed.
The application prospect of plus-in valve in electrohydraulic control support is studied. A chock-type hydraulic support equipped plus-in valve is designed, and analyzed in working principle.