The article has carried on the analysis to the original 20×2500 four roller coiler machine hydraulic system\'s principle, presents the lower roll and in the both sides roller cylinder in view of the actual use under a cylinder connecting rod crawled, the cylinder to guarantee the piezotropy and so on questions to make the part improvement not well, has made the satisfactory progress.

Technique improvement of Z31900SM four rollers board machine;

This article introduces carries on the computation programming using Microsoft-Excel,estab-lishes the operating performance automatic conversion table of three-roller curling plate device,draws the selection diagram of curves of working ability by using the conversion table,and finally helps the operators to use the three-roller curling device more reasonably.