Material or article handling – Marine loading or unloading system – Marine vessel to/from shore
Patent
1996-10-22
1998-01-20
Krizek, Janice L.
Material or article handling
Marine loading or unloading system
Marine vessel to/from shore
198509, 4141417, B65G 6760
Patent
active
057095175
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is the US national phase of PCT application PCT/EP96/00878 filed 1 Mar. 1996 with a claim to the priority of German application 195 07 375.4 filed 3 Mar. 1995.
FIELD OF THE INVENTION
The invention relates to an apparatus movable parallel to a ship to be unloaded for unloading of bulk material from the cargo holds of ships by means of a raisable and lowerable boom with a grab that is operated by a cable and that dumps the bulk material taken out of the cargo hold of the ship into a catch bin.
BACKGROUND OF THE INVENTION
The known apparatuses of the described type are all constructed according to the same principle, that is the ship is unloaded by means of a grab of a volumetric capacity suitable to the size of the ship to be unloaded which is moved horizontally and vertically by a winch and a trolley movable back and forth on the boom. In addition the entire unloading apparatus is movable on the dock parallel to the ship to be unloaded over the entire length of the hold of the ship.
As a rule with these known apparatuses the support frame is provided over the dock with a catch bin in which the bulk material taken out of the ship by the grab is dropped. Thus the grab must travel from the pickup location in the ship hold to the drop-off location of the bulk material over the catch bin, moving a relatively long distance both horizontally and vertically while full and also on return while empty. The time thus wasted and the maximum number of working cycles is determined by the unloading capacity of a large grab that is filled completely up and that itself weighs quite a bit. The weight of the grab corresponds however to the capacity of the entire apparatus such that the known apparatuses have a very great weight even when empty. The initial setup costs and the operation costs are also correspondingly high. These are the main disadvantages of the known apparatuses.
OBJECTS OF THE INVENTION
SUMMARY OF THE INVENTION
It is an object of the invention to substantially shorten the travel path of the grab in order to reduce its weight so that the apparatus can be less expensive and thus more cheaply designed.
These objects are attained by an apparatus of the above-described type wherein bin, is controlled by the lift cable of the grab that is moved by a winch.
The apparatus according to the invention has a completely new conception relative to the known and described apparatus. Thus with the apparatus according to the invention no horizontal movement of the grab is needed because the catch bin is positioned in the region above the ship hatch. The slight horizontal movement of the grab that is necessary in order to bring the grab into the correct dumping position over the catch bin and back is effected by the pivotal outrigger arm. The outrigger arm makes it possible to move the grab, after taking up bulk material and after raising the grab by means of the winch to a position near the edge of the catch bin, by pivoting back into the dumping position over the catch bin and then back again. This process is repeated with each working cycle of the grab. The pivotal movement of the pivotal outrigger is conformed in use to the current boom inclination.
As a result of the relatively short travel, the grab can be made substantially smaller and therefore lighter. Since however the weight of the grab determines the design of the entire apparatus, the apparatus according to the invention can be at least 50% lighter than the known apparatuses.
The possibility of raising and lowering the outrigger arm by means of the boom in a certain range and thus to maintain the catch bin always as close as possible over the ship hatch, makes it possible to reduce the vertical grab movement always to the minimal necessary path between the upper surface of the bulk material and the dumping height of the grab above the catch bin.
With the apparatus according to the invention there are in addition positive secondary advantages that relate back to the spilling of particulate materi
REFERENCES:
patent: 2796180 (1957-06-01), Rose
patent: 4218168 (1980-08-01), Parsons
Arend Jurgen
Steckel Horst
Dubno Herbert
Krizek Janice L.
Krupp Fordertechnik GmbH
Wilford Andrew
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