[0001] The present patent application relates to a mixer for concrete and similar mixtures,
provided with two mixing shafts with horizontal axis assisted by double motorization.
[0002] As it is known, mixers for concrete or similar mixtures currently comprise a large
tank with two counter-rotating shafts with horizontal axis, on which series of radial
arms used to mix the compound contained in the tank are fitted.
[0003] According to the current technology, each shaft is fitted and supported on two opposite
walls of the tank, it being also provided that on the outside of the tank one end
of each shaft is coupled with the geared motor capable of rotating the shaft, while
the other end of the shaft is supported by a suitable bearing fixed to the wall of
the tank.
[0004] In view of the poor fluidity of the compounds to be mixed, each mixing shaft is assisted
by a very powerful geared motor.
[0005] This particular requirement has so far hindered the building of larger mixers, since
the mixing of large volumes of compound requires the adoption of geared motors with
higher dimensions and more power compared to the models currently produced by manufacturers.
[0006] For this reason, users in need of larger mixers have been so far forced to ask manufacturers
to design and produce "special" geared motors with very high power, involving great
difficulties and expenses.
[0007] The purpose of the present invention is to realise mixers with very large mixing
tanks with respect to ordinary mixers, thus avoiding the need of manufacturing the
expensive "special" geared motors with large dimensions mentioned above.
[0008] According to the present invention, a pair of standard geared motors is fitted to
each mixing shaft of the mixer. More precisely, each geared motor must be applied
to one end of the mixing shaft externally on the tank wall.
[0009] It appears obvious that such a mixing shaft can be provided with high power - that
is the power of the two geared motors - without requesting special parts or modifying
the general structure of the mixer.
[0010] For major clarity the description of the invention continues with reference to the
enclosed drawings, which are intended for purposes of illustration and not in a limiting
sense, whereby fig. 1, 2 and 3 are a side view, a front view and a top view, respectively,
of the mixer according to the present invention.
[0011] With reference to the enclosed figures, the mixer (1) according to the present invention
comprises a rectangular mixing tank (2) provided with a cover (3) with lateral openings
(3a). The ends of two counter-rotating parallel mixing shafts with horizontal axis
are fitted to the transversal walls (4) of the tank (2).
[0012] As mentioned earlier, the main characteristic of the invention is represented by
the fact that each end of each shaft is coupled with a geared motor (5) of standard
dimensions and power located externally on the bearing wall (4) of the tank (2).
1. Mixer for concrete and similar mixtures, of the type provided with a preferably rectangular
mixing tank (2), on whose transversal walls (4) the ends of two counter-rotating parallel
mixing shafts with horizontal axis are fitted to support corresponding series of radial
mixing arms, characterised in that each end of each shaft is coupled with a geared
motor (5) located externally on the corresponding transversal wall (4) of the tank
(2).
