The polished rod guide post is a guide element used in combination with the parts in the die to ensure that the die moves with accurate positioning and guide the die stroke. It is generally cylindrical with shoulders and generally has oil grooves. The ball guide pillar assembly is a device used in the mold, which can make the moving template of the mold open smoothly under the action of the jack-up mechanism. Guide post guide sleeve group is a guide element used to guide the die stroke and ensure the accuracy of the die stroke. In the prior art, the ball guide pillar assembly is mainly used as a guide element in the mold, and the ball cage is filled with balls, so that the precision is high and the use cost is low.