1. A paddle mixer, comprising: a support frame; a stationary drum rigidly connected to said support frame; a vertical shaft extending into said stationary drum; a motor-reducing unit connected to said vertical shaft; a plurality of transverse arms connected to said vertical shaft within said stationary drum; a paddle connected to each of said transverse arms, said drum having a discharge mouth; a horizontal gate provided in a bottom of said drum, said horizontal gate for opening and closing said discharge mouth; a lever connected to said horizontal gate for manually moving said gate between an open position and a closed position; a protective grate disposed below said horizontal gate, said protective grate being connected to said drum; electrical power means, including a control unit for controlling said motor-reducer unit, said paddles including fixed paddles, fixedly connected to a corresponding one of said plurality of transverse arms, each of said fixed paddles including two plates, of substantially the same dimension, said two plates being disposed at a free end of said corresponding arm and a rubber element interposed between said two plates, whereby upon rotation of said vertical shaft, the rubber elements scrape one of a side and the bottom of said stationary drum.

2. A paddle mixer, according to claim 1, wherein said paddles include a paddle rotatively connected to one of said plurality of transverse arms.

3. A paddle mixer, according to claim 2, wherein said rotating paddles include an axis of rotation which is inclined with respect to a horizontal plane and said rotatable paddles are shaped to have a helically-curved surface.

4. A paddle mixer, according to claim 1, wherein said stationary drum includes an upper open end defining a loading mouth, a second grate being disposed above said loading mouth and positioned coaxial thereto; a horizontal pivot connecting an outer side wall of said drum to said second grate; a fork-like bracket rigidly connected to said second grate, said fork-like bracket connecting said second grate to said horizontal pivot, whereby said grate rotates about an axis of said pivot; a handle fixed to said second grate on a side of said second grate opposite to said pivot; an annular cam coupled to said pivot; a vertically sliding switch including electrical contacts connected to said motor-reducer unit said sliding switch being acted on by said cam to open said electrical contacts, whereby said motor-reducer unit is powered off upon an operator lifting said second grate.

5. A paddle mixer, according to claim 1, wherein said vertical shaft is provided with a top with a substantially truncated-cone-shaped element, said cone-shaped element being coaxial to said vertical shaft; a pipe for the admission of a liquid into said stationary drum, said pipe having a discharge end positioned above said cone-shaped element whereby liquid introduced into said pipe is spread by said cone-shaped element, in a rain-like fashion, over material within said stationary drum.

6. A paddle mixer, according to claim 1, wherein said horizontal gate is formed of two horizontal facing coaxial plates with an annular rubber gasket positioned therebetween, screw means for joining said two horizontal facing coaxial plates together, a fork-like bracket connected to said lever on a side of said lever opposite to a lever handle; a gate-bearing member including a counteracting spring having a vertical axis, said gate-bearing member being supported by said fork-like bracket for allowing upwardly directed elastic compression of said horizontal gate against a lower edge of said discharge mouth of said drum.

7. A paddle mixer, according to claim 1, further comprising a gate paddle including a plate construction formed of two plates with a rubber element interposed therebetween, said gate paddle being provided at a bottom of said horizontal gate whereby said gate paddle scrapes a lower surface of said grate, whenever said horizontal gate is operated.

8. A paddle mixer, according to claim 1, wherein said support frame includes damper means for absorbing shocks during movement of said support frame.

9. A paddle mixer, according to claim 1, wherein said frame includes a lifting jack to adjust a position of said stationary drum.

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