Agitating – Mortar mixer type – With dynamic delivery
Patent
1996-02-26
1997-11-04
Cooley, Charles E.
Agitating
Mortar mixer type
With dynamic delivery
366 59, 366227, 366233, B01F 902, B28C 542, B28C 716
Patent
active
056831773
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a transport mixer for bulk-material or solid/liquid mixtures, and more particularly, to a transport mixer having a cylindrical transport silo, mounted on a frame, with an almost horizontal axis and a controllable drive for the transport silo, which can be reversed depending upon an angle of rotation, the transport silo having a feed opening on its periphery, which can be closed, a conveyor spiral on an interior wall of the transport silo and a circular discharge channel with a discharge opening directed towards the interior of the transport silo and which is located at a rear wall of the transport silo.
Transport mixers having a cylindrical transport silo are known through, among others, the U.S. Pat. No. 2,038,158. The transport mixer described in this patent has a cylindrical transport silo, the longitudinal axis of which is mounted horizontally on the frame of a vehicle. The transport silo has a drive motor for axial rotation of the cylindrical transport silo which is supported by a respective bearing on the frame. The transport mixer has a locking feed opening, approximately in the middle of the horizontal axis of its cylinder wall, which is to be opened when it is on the upper side of the transport silo. A mixer spiral is positioned on the cylindrical interior wall of the transport silo for conveying a viscous concrete in the transport silo axially, thus mixing it. On an end wall at a rear end of the transport silo, an opening is positioned close to the periphery of the transport silo, through which the mixture is conveyed in a circular discharge channel. The discharge channel spans over an angle of 240.degree.. A second channel is located in its interior. Should the rear end of the discharge channel lie below the surface of the viscous mixture, the mixture in the discharge channel is first conveyed into this second channel. Both channels are followed by a spiral-shaped wall, which, on further rotation to the back, conveys the mixture, flowing out from the rear of the channels, to the central discharge opening. This discharge opening is open to the rear of the transport silo.
The above arrangement has many decisive disadvantages and, therefore, this concept has not received any attention for more than 60 years and, in general, pear-shaped transport silos with an inclined rotation axis have been used. In detail, the disadvantages of the design according the patent U.S. Pat. No. 2,038,158 are the following: the feed opening on the periphery of the cylinder could not be closed safely, the energy generated by the vehicle was not sufficient to ensure consistency of the mixture during transport, and it was not possible to ensure fast and continuous discharging of the transport silo while at the same time avoiding overflowing during transport.
Cleaning of such a transport silo has also posed considerable problems. The quantity of water, required for cleaning the cylindrical transport silo with horizontal positioning of the axis is too high in terms of economy.
For the above reasons, transport silos with an inclined axis have been used. With the growing demand for the fast transport of large quantities of light concrete, concrete flooring material or other viscous materials which can be hardened, it has become necessary to increase the volume of the transport mixers. In this respect, the inclined transport mixers have reached their limit of application. The load of the transport mixer cannot be distributed uniformly on the axles of the transport vehicle so that individual axles would, by far, exceed the load capacity of the streets.
SUMMARY OF THE INVENTION
The object of the present invention is to construct a transport mixer with a horizontal, cylindrical transport silo allowing large quantities of mixtures to be distributed in the transport silo, complete sealing of the transport silo during transport, preservation of a consistency of the mixture during transport at low energy expenditure, fast and almost continuous discharging of the transpor
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Dietrich Holger
Herrmann Frank
Hoferichter Frank
Cooley Charles E.
Imk Ingenieurkontor fuer Maschinenkonstruktion GmbH
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