Metal fusion bonding – Process – With clamping or holding
Patent
1983-09-19
1987-01-06
Godici, Nicholas P.
Metal fusion bonding
Process
With clamping or holding
291635F, 228904, 2281735, 140 922, B01D 2922, B23P 1516
Patent
active
046340459
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to the manufacture of screens, substantially frusto-conical in shape, for use in the dewatering of materials including coal, bauxite, and other minerals.
Known screens of this type comprise a plurality of screening wires forming a substantially frusto-conical surface. The screen is open at each axial end, and supported for rotation with its axis horizontal. Ore or other material enters the smaller end of the screen, and with rotation of the screen (typically 300 to 400 r.p.m.) water is removed through the gaps between the screening rods, and the ore or other material, in relatively dry condition, leaves the larger end of the screen.
BACKGROUND ART
A method presently utilised for the manufacture of such screens, involves the construction of a tubular cage of supporting rods, about which screening wires are wound and welded at their intersections with the support rods. The screen wires are of generally triangular cross section, with the apex of the wires contacting the support rods giving a line contact therewith suitable for electric welding.
In this prior art method, the welded tube is then split longitudinally and flattened, and cut into four trapezoidal sections and four rectangular sections. These sections are then rolled in the opposite direction so that the screening wires are then on the inside of the curved surface. The trapezoidal and rectangular sections are then welded along adjacent edges with the aid of interposed connecting strips to make an imperfect frusto-conical screen. Support rings are then welded at the ends of the screen.
This technique gives an adequate weld strength, which is necessary for the screen to have a life which is limited in most cases only by wear of the screening rods, but since the cross section of the screen insufficiently approaches that of a perfect frusto-conical surface, the screen is not perfectly balanced, leading to uneven wear resulting in premature failure of the basket, and wear on the bearings and associated machinery. Furthermore, this method of fabrication is very time consuming, and therefore very costly.
OBJECT OF THE INVENTION
An object of this invention is to provide apparatus for the manufacture of such dewatering screens, and a method of such manufacture, which will be more economical, and which will lead to a screen which more perfectly approaches a frusto-conical shape.
SUMMARY OF THE INVENTION
In one form, the present invention broadly comprises apparatus for the manufacture of a dewatering screen composed of a plurality of screen wires disposed on a frusto-conical surface and orientated in the axial direction of said surface, characterised in that said apparatus comprises a plurality of screen wire support members shaped to form when assembled together a frusto-conical surface, each support member comprising a plurality of parallel grooves dimensioned for the reception of the screen wires, said grooves being orientated in the axial direction of said surface. Preferably, the support members are mounted so as to be movable towards the axis of the frusto-conical surface thereby to disengage from the wires, and in the preferred embodiment of the invention, the support members are mounted for controlled movement between their retracted position and the position in which they form the frusto-conical surface.
In this way, the screen wires may be laid up to form the screen, by placing a screen wire in each groove of the support surfaces and then binding the wires in a cage by the application to the exterior of the array of wires, of a continuous support rod welded at its intersections with the screen wires.
In another broad form, the present invention therefore resides in a method of manufacturing a dewatering screen composed of a plurality of screen wires disposed on a frusto-conical surface and orientated in the axial direction of said surface, characterised by the steps of providing a plurality of screen wire support members defining a frusto-conical surface, each said support member comprising a plurali
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Godici Nicholas P.
Rowan Kurt
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