通过优化系统的最优利用率并考虑系统各机器的工作平衡，本文给出了载荷问题三个新的优化模型。
Based on Kusiak's idea, three new models of loading problem with the aim to optimize the utilization ratio ot machines and to balance jobs assigned to each machine are formulated.
根据气动平衡系统所需功能，设计了压力控制设定、载荷切换控制、执行控制、失压保护和残压释放等功能模块；
All kinds of function modules of pneumatic balance circuits have been designed such as air press regulation, loads switch, execution control, decompression protection and residual pressure exhaust.
顺穿法一般在电动钻机上采用，主要考虑到电控操作提升系统比较平稳； 花穿法一般在机械钻机上使用，以受力平衡来缓解气控操作带来的冲击载荷的影响。
The sequent wire-pulling is used in electric powered rig as it has smooth lifting system and cross wire-pulling is used in mechanical rig as balanced force relief impact force by compressed ai.
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