1. Vacuum feeding at the bottom of powder

　　Vacuum Powder Feeding from Bottom Powder material is sucked from tank bottom by vacuum, with short feeding distance and fast feeding speed. It is automatic control, avoiding problems of slurry backflow, evacuation, etc. Powder sucked into tank will be surrounded by water, without powder pollution and blockage, realizing continuous powder suction. Two minutes can suck about 500kg powder. While in traditional vacuum suction, powder is fed from top of tank, requiring 25 minutes, and powder is easily sucked away and sticking on the inner wall, wasting materials. Patent No . 201120154517.8 Patent No. 201120154536.0