Classifying – separating – and assorting solids – Sifting – Elements
Patent
1997-10-10
2000-08-08
Bollinger, David H.
Classifying, separating, and assorting solids
Sifting
Elements
209421, B07B 149
Patent
active
060988126
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a mobile screening apparatus, and to a method of screening material and depositing the screened material while the apparatus is moving over the ground.
Screening apparatus are used to screen crushed rock, and other supply of particulate raw material into different size ranges of screened particles, and to distribute the screened fractions to separate discharge positions.
In a typical installation of a screening apparatus or plant in a quarry, the apparatus has a number of separate discharge conveyors or elevators, each being associated with a separate screening fraction from the usual multi-deck screen, and which can deposit separate stockpiles of different sizes e.g. sand, small aggregate or gravel, and ballast suitable for building or road foundation work.
At some sites, a screening plant is set-up as a permanent, or semi-permanent installation, and which is assembled on site, and which has to be dis-assembled and transported as separate components before re-assembly at a new site. However, at other locations, it is known and desirable to use mobile screening apparatus which can be towed from one site to another, and including along the public highway. Mobile apparatus can be converted relatively easily between a transport mode and an operative screening mode.
The present invention is concerned with what is believed to be a unique concept in screening apparatus, in that it enables, when desired, screening operations to be carried out while the apparatus is moving over the ground.
According to one aspect of the invention there is provided a mobile screening apparatus which comprises:
a wheel-supported main frame;
a hopper mounted at or near to one end of the main frame to receive a supply of bulk material which is to be screened;
an elevator mounted on the frame and having a lower receiving end arranged to receive material from the hopper, and to convey this material to an upper discharge end of the elevator;
a screening device mounted on the frame and arranged to receive material from the discharge end of the elevator, and to screen the material into different size ranges;
discharge means associated with the screening device and operative to discharge the different size ranges to respective discharge positions;
a towing coupling provided at said one end of the frame; and
a tractor unit releasably coupled with said towing coupling and operative to move the apparatus over the ground while screening operations take place, whereby travelling deposits of screened material can be formed.
The tractor unit may be used to tow the apparatus at a continuous relatively slow speed, or to move the apparatus in small increments, according to the requirements for the travelling deposit of screened material.
According to a further aspect of the invention there is provided a mobile screening apparatus which comprises:
a wheel-supported main frame;
a hopper mounted at or near to one end of the main frame to receive a supply of bulk material which is to be screened;
conveyor means mounted on the main frame and having one end arranged to receive material from the hopper, and an opposite end forming a discharge end;
a screening device mounted on the frame and arranged to receive material from the discharge end of the conveyor means, and to screen the material into different size ranges;
discharge means associated with the screening device and operative to discharge the different size ranges to respective discharge positions;
a towing coupling provided at said one end of the frame;
a power plant arranged to drive the screening device, the conveying means, and the discharge means; and
a tractor unit releasably coupled with said towing coupling, said tractor unit being arranged to derive its motive power from said power plant in order to move the apparatus over the ground when required.
Preferably, the power plant is mounted on the main frame of the screening apparatus, and any suitable means may be used to transmit motive power to the tractor unit. By way of example only, the tractor unit may have a hy
REFERENCES:
patent: 4861461 (1989-08-01), Utterback
patent: 4983280 (1991-01-01), Eriksson
patent: 5161744 (1992-11-01), Schoop et al.
patent: 5183160 (1993-02-01), McCain
patent: 5234564 (1993-08-01), Smith
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