Method and means of conveyance of solid matter in pieces or particles
AssigneeRauma-Repola Oy
InventorArvo Jonkka
Life of this patent
Estimating the term…
Abstract
Method and means of conveyance for solid material, f.ex. tree trunks (6) or bark, whereby the solid material is conveyed with parallel, oblong transfer elements (4) moving back and forth in transfer direction. A larger part of the surface of the transfer elements (4) is moving forward at a time than moving backward. The speed of the return motion of the transfer elements is higher than that of the feed motion of the transfer elements. Transfer elements (4) at sides of the conveyor have been inclined on their longitudinal axis so that they slope towards the center of the conveyor. In this way the friction force between the particles (6) of the material to be conveyed is increased and the friction force between the material (6) to be conveyed and the transfer elements (4) is decreased.
Claims17
A method of conveying pieces of material comprising the steps of:
- placing said pieces of material onto a support surface area of a conveyor formed of a plurality of parallel oblong transfer elements;
- simultaneously moving a predetermined number of said transfer elements in a forward motion and a predetermined number of said transfer elements in a return motion along a line parallel to a conveying direction such that said support surface area of said conveyor includes a forward moving surface area and a return moving surface area, wherein at any predetermined period of time, said forward moving surface area is in contact with said pieces of material and is larger than said return moving surface area, and wherein the speed of said return motion is higher than the speed of the forward motion;
- urging said pieces of material through said conveyor wherein a first frictional force between each of the pieces is increased as a result of positioning outermost transfer elements at an angle relative to a horizontal plane, said first frictional force being greater than a second frictional force existing between the pieces of material that are being conveyed and the transfer elements.
A means for conveying pieces of material comprising:
- frame means;
- a plurality of oblong shaped transfer elements positioned substantially parallel to each other along a conveying direction on said frame means to form a conveyor with a predetermined surface area, said transfer elements being movable in a forward and return motion along a line parallel to said conveying direction such that said conveyor has a forward moving surface area and a return moving surface area at any particular period of time;
- said forward moving surface area being in contact with said pieces of material and being larger than said return moving surface area at any particular period of time;
- means for moving each of said plurality of transfer elements at a return speed of movement that is greater than a forward speed of movement;
- and
- outermost transfer elements of said conveyor being inclined relative to a horizontal plane such that said outermost transfer elements slope towards a center of said conveyor.
Dependencies are inferred from the claim text.