Classifying – separating – and assorting solids – Sifting – Elements
Patent
1996-03-21
1999-09-28
Terrell, William E.
Classifying, separating, and assorting solids
Sifting
Elements
209420, 209257, B07B 128, B07B 146
Patent
active
059573023
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a mobile screening apparatus of the general type which comprises a frame, a screen mounted on said frame, a hopper for receiving a supply of screenable material and for feeding said material to the screen so as to be separated-out into screened portions of different size ranges, means for discharging the separated portions of screened material from the apparatus, and moving means supporting said frame and operable to move the apparatus over the ground.
The invention seeks in particular to provide an improved mobile screening apparatus of the type referred to above, and which can be used to carry out screening operations while moving over the ground, and to discharge separated portions of the screened material to required deposition zones.
It is of course well known to provide static screening plants, in the sense that all screening operations e.g. in a quarry installation, take place while the screening plant is located at a fixed site, although the plant can be transported from one site to another when required. To achieve easy transportation, it is known to provide a towable screening plant which has a forward towing hitch, and which has one or more wheelsets to enable the plant to be towed behind a towing vehicle. However, it is mobile only in the sense that it can be towed from one site to another, after conversion to a transport mode, and actual screening operations can only take place after the plant has been installed at the new site, and usually after conversion of the plant from the transport mode to an operative mode. This generally involves unfolding discharge conveyors, and any other component parts which project outwardly in use.
It is also known to provide travelling hoppers to discharge material from the hoppers onto a prepared site e.g. during laying of hard core to form the base of a motorway carriageway, in which the hopper moves back and forward between a pair of side rails, and also moves progressively along each rail at the end of each path of movement, so that the prepared site becomes filled progressively with hard core.
The invention seeks to provide a mobile screening apparatus which is capable of (1) receiving a supply of screenable material; (2) screening the material e.g. into, at least two different size ranges of screened material; (3) discharging the separated material; and (4) carrying out all of these operations while the plant is moving, if required, so as to deposit at least one separated portion of screened material in a required deposition zone.
According to the invention there is provided a mobile screening apparatus which comprises: the ground; supply of screenable material and to discharge the material to the screen so that the latter can separate the material into screened portions of material; and, separated portion of screened material along a required deposition zone while the apparatus is being moved by said moving means.
The invention therefore provides a self-propelled screening apparatus or plant which is capable of receiving a supply of screenable material, separating the material e.g. into at least two size ranges of which preferably one includes so-called "fines", and discharging at least one of the separated range of screened material to a required deposition zone along which the apparatus is moved via said moving means.
Preferably, the discharge means comprises a discharge conveyor arranged to receive said one separated range of material from the screen, and to convey the material outwardly of the frame of the apparatus. The conveyor may be adjustably mounted on the frame, so that the discharge end of the conveyor can be adjusted laterally and/or upwardly and downwardly to vary its position relative to the frame.
The conveyor may be mounted to slew about an upright axis which is a substantially vertical axis when the apparatus is on level ground to adjust itself laterally, and about a substantially horizontal axis to vary the discharge height of the end of the conveyor.
Conveniently, the conveyor is mounted at one end of the fra
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Mackey Patrick
Terrell William E.
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