振动切削钴结壳破碎减阻机理分析  

Research on Drag Reduction Mechanism of Vibratory Excavation of the Ocean Cobalt-rich Crusts

作　　者：朱建新[1] 罗伟[1] 邹湘伏[1] 

机构地区：[1]中南大学机电工程学院智能机械研究所,湖南长沙410083

出　　处：《矿冶工程》2007年第4期10-13,共4页Mining and Metallurgical Engineering

基　　金：中国大洋矿产资源研究开发协会深海项目(DY105-03-02);国家自然科学基金项目(50374071)

摘　　要：将螺旋滚筒式振动切削应用于深海钴结壳的开采,对振动切削钴结壳的过程进行了分析,从理论上研究了振动切削钴结壳的减阻机理,认为振动所产生的应力脉冲是引起裂纹高速扩展的原因,只有当振动频率在一定的范围之内时才能引起裂纹的高速扩展、分叉,最后导致破碎。同时分析了施加振动后对切削阻力的影响。通过实验证实,引入振动脉冲,滚筒截齿切削力确有较大幅度的降低,载荷波动也有所减缓,并使钴结壳粒度更集中控制在某一范围内。Screw drum-type vibration cutting is adopted in mining oceanic cobalt-rich crusts. The process of vibration cutting has been analyzed. The drag reduction mechanism of vibration cutting has been studied theoretically. It is con-sidered that the impulse caused by vibration results in fast expanding of cracks. It is found that only the vibration fre- quency in certain range can make the cracks expand fast and branch off and then make the crust break. The effect of vi- bration on cutting resistance is analyzed. It is proved that the application of vibration impulse greatly decreases the resist-ance of the screw drum and slows down the fluctuation of the load and controls the granularity of the crust within certain range.

关 键 词：海洋采矿 螺旋滚筒式振动切削 钴结壳 应力脉冲 裂纹 

分 类 号：TP273.5[自动化与计算机技术—检测技术与自动化装置] TD807[自动化与计算机技术—控制科学与工程]