Due to the variation of log diameters at the operation of the conveyor, it is not uncommon to cause abnormal operation of the dial device so that the logs were blocked from entering the next stage. In response to the above issue, four solutions were proposed. The statics of the horizontal "string" dial structure and the "mouth" dial structure were analyzed using related software, and the results showed that the horizontal "string" dial structure scheme met the requirements. It was suggested that various factors need to be considered comprehensively, and the "electric-snail" control dial structure and the "reduction-curve" control dial structure were selected according to actual requirements.