Mixing machine with a mixing head (3) and with a through a wall (15) of the mixing head (3) guided into the interior, rotatably driven drive shaft (9) through which a mixing tool within the mixing head (3) can be driven, wherein in a wall opening (16) the wall (15) is a sealing bush (13) is used to seal the shaft passage, which is supported with a radially outwardly projecting retaining flange (14) on the mixing head inside and releasably connected thereto, characterized in that the sealing bush ( 13) passes through the wall opening (16) and in its protruding from the outside of the wall (15) portion has a radially outwardly projecting clamping flange (18) and that the mixing head (3) carries a clamping device (17) with two, with respect the longitudinal axis of the sealing bush (13) arranged on opposite sides, in each case about a pivot axis located in the transverse plane of the sealing bush (13) pivotable Clamping pieces (19, 19.1) each having at least one clamping cam (21) for clamping the sealing bushing (13) in the wall opening (16) by pivoting the clamping cam (21, 21.1) against the retaining flange (14) facing top of the clamping flange (21). 22) acts.
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