Research;
Center;
of;
Advanced;
Mining;
Equipment,;
Ministry;
of;
Education,;
Hunan;
University;
of;
Science;
and;
Technology,Xiangtan,;
Hunan;
411201,;
China;
Liangchuan;
Coal;
Mine;
Machine;
Co.;
,;
Ltd.;
,;
Xiangtan,;
Hunan;
411104,;
China;
Electric;
Manufacturing;
Corporation;
Ltd.;
,;
Xiangtan,;
Hunan;
411101,;
China;