Rake thickener

The utility model discloses a rake thickener, which comprises a conical thickening pond and a rake frame, wherein an overflow port is formed in the upper part of the thickening pond; the rake frame is partitioned into a main rake frame and a secondary rake frame; the main rake frame and the secondary rake frame are cross-shaped; submerged pumps are arranged below the two ends of the main rake frame respectively, and are connected with a water tube; a spray head is arranged on the water tube; the water tube can rotate concentrically along with the main rake frame, and is arranged on the lower side of a central disk by passing through the main rake frame; the central disk is positioned above the main rake frame, and is arranged on a central shaft of the thickening pond; and a bubble gathering ring is arranged below the main rake frame, and is concentric with the central disk. Due to the adoption of the bubble gathering ring, generated foam can be limited in a bubble gathering range for undergoing centralized de