Excavating – Cable-operated – Boom-type
Patent
1998-09-23
2000-02-15
Shackelford, H.
Excavating
Cable-operated
Boom-type
37401, 37461, 37187, 254286, 254293, 212320, 212322, E02F 358, B66C 1116
Patent
active
060238623
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a control system for a rope bucket, the rope bucket being designed for the hoisting and transfer of materials and adapted to be suspended from a hoist trolley transferable along an essentially horizontal travel path, and the control system comprising a hoist mechanism for hoisting and lowering the rope bucket, the hoist mechanism comprising a motor driven hoist drum and hoisting ropes secured to the rope bucket and the hoist drum intended for spooling in and paying out the hoisting ropes, a close mechanism for closing and opening the scoops of the rope bucket and also for hoisting and lowering the rope bucket, the close mechanism comprising a motor driven close drum and close ropes secured to the rope bucket and to the close drum intended for spooling in and paying out the close ropes, and a transfer mechanism for transferring the hoist trolley along the travel path.
Rope buckets comprise two or more scoops which are pivoted around their support point such that when the scoops are used, they are pressed one against another, whereby the scoops close, and similarly when the scoops are emptied, they are pushed away one from another whereby they open. The scoops, i.e. the bucket is supported and pivoted by means of ropes secured to both the bucket and the rope drums which are rotated by electric motors, the motors typically being DC motors.
In a known, presently generally used hoist solution the ropes supporting the bucket are routed via an auxiliary trolley and fixed rope pulleys or sheaves to the rollers or drums of the hoist and close mechanisms. The hoist mechanism serves to hoist the bucket and its load. The close mechanism again serves to open and close the scoops of the rope bucket, but it also contributes to hoisting and lowering the bucket and its load. The hoist trolley again is moved by its own transfer mechanism. The auxiliary trolley moves at half the speed of the shuttle trolley in order to compensate for the change in rope lengths during a transfer movement. Hoist and close ropes subject the hoist trolley to a horizontal force corresponding to the load, and the auxiliary trolley to a double force. This determines the dimensioning of the transfer ropes of the trolley, four parallel ropes being generally utilized. To account for stretching of transfer ropes, a separate rope tightening mechanism is additionally needed. This prior art is described in detail in e.g. the publication Series on Bulk Materials Handling Vol. 1 (1975/77) No 5--Stacking Blending Reclaiming of Bulk Materials--First Edition 1977, Trans Tech Publications.
The above described prior art forced controlled solution serves to keep the bucket scoops reliably closed during hoists and transfers, but some ropes are subject to unreasonably high rope forces relative to the load being hoisted, leading to a structure that is heavy in every respect. In addition, the system is very complex with a plurality of rope systems and related mechanisms and auxiliary devices serving each specific purpose.
It is the object of the present invention to provide a completely new control system for a rope bucket, eliminating the above drawbacks.
This object is achieved with the control system for a rope bucket according to the invention, characterized mainly in that the hoist mechanism comprises two separate mechanisms, the hoist rope of one hoist mechanism being routed to the hoist trolley from a first direction and from the hoist trolley to the rope bucket, and the hoist rope of the other hoist mechanism being routed to the hoist trolley from a second direction, essentially opposite to the first direction and from the hoist trolley to the rope bucket, that the close mechanism comprises two separate mechanisms, the close rope of one close mechanism being routed to the hoist trolley from said first direction and from the hoist trolley to the rope bucket, and the close rope of the other close mechanism being routed to the hoist trolley from said second direction and from the hoist trolley to the rope buc
REFERENCES:
patent: 572491 (1896-12-01), Locher
patent: 849257 (1907-04-01), Moss
patent: 2720327 (1955-10-01), Bain
patent: 2776758 (1957-01-01), Snow, Jr.
patent: 4343406 (1982-08-01), Noly
Heinz Althoff et al.; "Stacking Blending Reclaiming of Bulk Materials"; Series on Bulk Materials Handling . vol. 1 (1975/77) No. 5; Trans Tech Publications; p. 571-581.
KCI Konecranes International PLC
Shackelford H.
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