Abstract: The article aimed at the problem of unbalanced tension in the double chain of scraper conveyor, “Deviation of intervention” (Workers on-site grinding to change the pitch of chain link)is used to adjust it at Shenhua Shendong mining area at present. designed and applied of the variable pitch connect link to adjust the chain tension, which can be simple, efficient guarantee safe and reliable operation of the scraper conveyor,an effective way of a short time, low cost, greatly educe workers labor to similar troubleshooting is found for the future.