球qiu磨mo機ji的de轉zhuan速su在zai不bu斷duan加jia大da的de過guo程cheng中zhong，可ke能neng會hui產chan生sheng這zhe樣yang一yi瞬shun間jian，即ji此ci時shi球qiu將jiang不bu從cong球qiu磨mo機ji內nei部bu表biao麵mian落luo下xia，而er與yu球qiu磨mo機ji的de筒tong體ti一yi起qi旋xuan轉zhuan。當dang球qiu磨mo機ji轉zhuan動dong時shi，球qiu隨sui著zhe球qiu磨mo機ji的de筒tong體ti一yi同tong轉zhuan動dong，而er不bu於yu筒tong體ti分fen開kai，這zhe種zhong球qiu磨mo機ji的de轉zhuan速su成cheng為wei臨lin界jie速su度du。
zailinjiezhuansushi，wuliaomodebingbuhao，qiumojideshengchannengliyebugao。shijishang，qiumojizaichangyongdezhuansuheqiudezhuangzailiangshi，mokuangzhuyaoshikaoqiudechongjizuoyong，zhedianshikendinglede。yinci，zaiqiumojizhongjinxingmokuang，shiyoumouzhonggaoduluodaoyusuiwuliaoshangdetieqiulianxuchongjidejieguo。qiudechongjizuoyongshiyouqizhongliangheluoxiadesudulaijuedingde，luoxiadesuduyouqujueyuluoxiadegaodu，yinciqiude衝擊作用即取決於球的動能。
隨sui著zhe球qiu磨mo機ji轉zhuan速su的de增zeng高gao，球qiu的de動dong能neng也ye加jia大da。這zhe種zhong增zeng加jia隻zhi能neng連lian到dao一yi定ding範fan圍wei的de較jiao大da值zhi此ci後hou再zai增zeng加jia球qiu磨mo機ji的de轉zhuan速su，動dong能neng反fan而er減jian小xiao。球qiu磨mo機ji的de轉zhuan速su等deng於yu臨lin界jie轉zhuan速su的de76%—88%時，球的動能產生較大效率。在這種情況下，球磨機的生產能力也較大。
因此，球磨機較有效的轉身就，介於臨界轉速的76%—88%這一範圍之內。
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