The counterweight iron classifies generally according to the modelling method, in the custom divides into the ordinary sand mold counterweight iron and the special counterweight iron.
配重铁一般按造型方法来分类，习惯上分为普通砂型配重铁和特种配重铁。
2
The dynamic optimization method of determining the counterweight and its center of portal crane is put forward.
提出了确定门机对重质量及其位置的动态优化法。
3
In order to improve the counterbalance effect of pumping units, this paper represents a method of installation with forward offset counterweight.