Reverse flow type multi-stage sedimentation rake-free thickening device

1. A reverse flow type multi-stage sedimentation rake-free thickening device, comprising a feed assembly, a guide assembly, and a clean coal collection assembly; wherein the guide assembly further comprises a central tank; slime water flows from an upper part of a central tank body to an inner side wall of the central tank body through the feed assembly and a reagent, and then flows to the middle of the central tank body through a guide assembly; the clean coal collection assembly collects floating residual mineralized bubbles and a fine coal slime that moves upward into the clean coal collection assembly; the clean coal collection assembly is provided above an outlet of the guide assembly and the clean coal collection assembly is sequentially provided with a central aggregate area, a bubbles defoaming area, and a diversion and settlement area from the middle to an outside;

the bubbles defoaming area comprises a first diversion sedimentation screen and a defoamer located at a pre-set position above the first diversion sedimentation screen; the defoamer includes a hammering unit and a driving unit; the hammering unit includes a hammering defoaming plate, a clean coal collecting tank and a hammering rod; the hammering defoaming plate is hinged on one end of the hammering rod; the first diversion sedimentation screen is fixed with a supporting unit; the other end of the hammering rod is hinged on the supporting unit; a clean coal collecting trough is fixed on a side plate of the first diversion sedimentation screen; one end of the driving unit is fixed on the supporting unit, and the other end is connected with the middle of the hammer rod.

2. The reverse flow multi-stage sedimentation rake-free thickening device of claim 1 , wherein the first diversion sedimentation screen comprises a first diversion area surrounded by side plates on both sides and a lower plate body; the lower plate body and a first underflow discharge pipe below the lower plate body are connected through a first discharge valve; and a high board and a low board are alternately provided between the side plates on both sides.

3. The reverse flow type multi-stage sedimentation rake-free thickening device of claim 2 , wherein the opposite surface of the high board and the low board is provided with a protruding expansion spoiler.

4. The reverse flow type multi-stage sedimentation rake-free thickening device of claim 1 , wherein the feed assembly includes a feed distribution tank, a main feed pipe, and a reducing pipe; a plurality of reducing pipes are evenly distributed between the feed distribution tank and a side wall of the central tank body; and at least one reagent ejector is also provided at a protrusion of the reducing pipe; a magnetic sprayer includes a first magnetism-concentrating ejection tube, a first magnetic powder feeding pipe and a first distributor; an upper end of the magnetism-concentrating ejection tube communicates with the feed distribution tank in the feed assembly, and a lower end is communicated with a first distributor; one end of the first magnetic powder feed pipe is communicated with the pipe at a magnetic powder supply and the other end of the first magnetic powder feed pipe is communicated with the first magnetization ejection pipe.