Hydraulic center drive thickener works pulp from the feed chute of the truss suppliers to into the thick pool by the barrel, by the bottom of the barrel is immersed in the under thickener clarification surface. A vertical axis in the dense center of the pool, and the end of the shaft is fixed a cross rake, rake frame the following equipped with scraper. Rake to the horizontal 8-15 °. The vertical axis by the drive motor through the worm reducer, concentrated materials rake scraper scraping into the pool center the discharge hopper exclusion clarification overflow from Ikegami Ministry overflow tank outflow. Second, the device features transfer torque, high efficiency, security, mud thoroughly, not clogged. When the load is too large, underwater scraping mud system can be manually or electric upgrade, and then gradually declined layers and scrape the sludge. Third, the scope of application is mainly used for wet beneficiation process concentrates dehydration processing, from the the concentrated role before dehydration. Tailings can also be used to pre-concentrated, especially fine grade concentrated tailings. Widely used in mining, chemical, paper and coal preparation industry.