Mixing apparatus for crushing sludge

A mixing apparatus for crushing sludge comprising:

• a motor part having a rotary shaft inserted into the motor part and penetrating the motor part from a first side to a second side, the motor part configured to rotatably drive the shaft,
• a moving part defining a penetrating path, the moving part formed to penetrate the motor part from a first side to a second side and move a chemical which is fed by an outside chemical feeder to the second side;
• a paddle comprising a first saw-toothed part projecting out from the paddle, the paddle operably mounted to rotate with the shaft on the second side of the motor part, wherein the paddle is in communication with the penetrating path and configured to discharge the chemical from the moving part when rotated,
• wherein the motor part comprises:
• a main body in which the rotary shaft is inserted;
• a first plate combined with the first side of the main body and one outer circumference of the shaft;
• and
• a second plate combined with the second side of the main body and another outer circumference of the shaft,
• wherein the second plate comprises:
• a second bearing part combined with an outer circumference of the shaft;
• a second sealing part combined to surround the second bearing part around an outer circumference of the second bearing part;
• and
• a securing part surrounding the second bearing part and the second sealing part, and securing the second bearing part and the second sealing part at or to the second side of the motor part.