Conveyors: power-driven – Conveyor having means specialized for collecting a load from... – Power-driven feed means
Patent
1987-10-19
1988-12-27
Paperner, Leslie J.
Conveyors: power-driven
Conveyor having means specialized for collecting a load from...
Power-driven feed means
4141419, 198671, 198658, B65G 6516
Patent
active
047934670
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus for unloading bulk material from ships in particular, said apparatus comprising a vertical conveyor and a horizontal conveyor connected thereto, said vertical conveyor being provided at its feeding end with a rotary feeding device for feeding the bulk material into the vertical conveyor.
2. The Prior Art
Arrangements of this type have found widespread use in the unloading of especially ships. One example of such an arrangement is described in SE-B-No. 377,099, corresponding to U.S. Pat. No. 3,990,567, according to which the vertical conveyor has a lower feeding device and can be swung outwardly from its vertical position and also raised and lowered, the horizontal conveyor being swingably mounted in such a way that its feeding and cooperating with and connected to the vertical conveyor is raisable and lowerable and also displaceable along a circular arc having its centre at a distance from the feeding end of the horizontal conveyor. In addition, the discharge end of the vertical conveyor and the feeding end of the horizontal conveyor are swingably interconnected, the angle between the two conveyors being controllable by means of a longitudinally controllable device. A development of this arrangement is described in U.S. Pat. No. 4,020,953 in which the vertical and horizontal conveyors are interconnected in a torsionally rigid but pivotal manner for mutual relative movements in a common plane, and furthermore the horizontal conveyor, apart from being swingably connected to the frame or foundation, is tiltably connected thereto for inclination of the plane common to the vertical and horizontal conveyors with respect to a vertical plane.
These prior art arrangements have been equipped with feeding devices according to, for example, U.S. Pat. No. 3,596,751 and have proved to be excellent ship unloaders. The feeding devices serve to promote the feeding of material to the vertical conveyor which frequently is a screw conveyor, the housing and conveyor screw of which are rotatable relative to one another. Usually, the housing is stationary, while the conveyor screw rotates within the housing. Examples of other feeding devices are the device according to European patent publication EP-A-No. 57,167. The devices according to U.S. Pat. No. 3,596,751 and European patent application EP-A-No. 57,167 are of the type where the screw and the feeder are rotated in opposite directions. It thus is the object of the feeder to positively introduce the material into the screw to enable the screw to take an efficient grip on the material and to convey it through the screw conveyor device.
Although the two feeding devices mentioned above by way of example have proved to give a satisfactory supply of material in most cases, they have not always been able to operate efficiently, especially if the vertical conveyor is inclined in relation to the vertical plane or, rather, in relation to the bottom of a ship's hold. Since the unloaders are frequently used for unloading ships, it is necessary to maintain a satisfactory feeding capacity also if the conveyor is inclined to be able to reach into corners and underneath the hatch coaming of the ship's hold. At the same time, it is desired to achieve as complete an unloading as possible also at such not readily accessible locations, thereby to reduce the need for special machines for the cleaning-up of these locations and moving the material within reach of the screw conveyor or the unloader. A further difficulty is that the hold bottom frequently is inclined in relation to the plane in which the frame of the unloading equipment is moving.
It has therefore been proposed to use a control system which, in principle, operates such that, during pendulum movement of the vertical conveyor, an automatic compensation is achieved by raising or lowering the horizontal conveyor, such that the "circular movement" of the feeding device, which is caused by the pendulum movement, will be converted into a re
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Johansson Robert
Tingskog Lennart
Consilium Materials Handling Marine AB
Dayoan D. Glenn
Paperner Leslie J.
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