不依赖外界能源，随单根起降绳的升降，抓斗就能自动启闭，不仅适用于港口原木的装卸，同时也是铁路，木材储运等作业理想的装卸工具。

Single rope timber grabs do not rely on external sources of energy.with going up and down of the single rope the grab can automatically be opened or closed. Not only can it be applied in port’s loading and unloading of timber,it is also ideal for loading and unloading of timber for the railroad, transportation and storage industries etc.