拨块在环链手扳葫芦中起到方向调节的作用，拨块在工作的时候分为左、中、右三个档位，按照控制方向来讲就是上、空、下三个方向，在调节拨块的之前需检查货物是否已经稳固挂在下吊钩上的正确位置，按照方向需求调节拨块后，就可以实现货物吊运的目的。如果将拨块调到向上的位置，则用于提升作业，反则调到向下的位置，则用于重物下降。
The shift block plays the role of direction adjustment in the chain block. The shift block is divided into three gears: left, middle and right. According to the control direction, it is up, empty and down. Before adjusting the shift block, it is necessary to check whether the goods have been firmly hung on the lower hook at the correct position. After adjusting the shift block according to the direction demand, the purpose of goods lifting can be realized. If the paddle is adjusted to the up position, it is used for lifting operation; otherwise, it is adjusted to the down position, and it is used for weight lowering.
因此，拨块组件的作用甚大，如果这个组件失灵或损坏，整个手扳葫芦将失去方向性，无法上或下降。在平时使用时我们需要定期保养维护。
Therefore, the function of the block assembly is very large. If this assembly fails or is damaged, the whole block will lose its directionality and cannot be up or down. We need regular maintenance during normal use.