Apparatus for thermally welding assembly, a series of bars of sustentacao with coating termoplastico a series of wire profiled extruded coating termoplastico and case paRA formation of a panel of sieve termoplastico

摘要

Apparatus for making plastic screen panels, and especially abrasion-resistant mining screens, includes a large rotary screen drum member on which an extruded, profiled cross-section screen surface-forming wire is helically wound at a pitch which will produce the desired screen slot width. Immediately adjacent the drum member is a rod-positioning mechanism from which a plurality of screen panel support rods are sequentially fed from a stack and welded to the wires on the drum surface in a direction parallel to the drum axis and transverse to the surface wires. The welding is done with a double-edged heater bar which is temporarily placed in contact with the rod and drum before the rod is forced against the drum. The screen drum is indexed after each support rod is attached to it by an angular amount sufficient to provide the desired spacing on the finished panel. After all the rods are attached to the wire-covered drum, the wires are severed along a line parallel to the drum axis and the now-finished panel is removed and used as is or preferably is cut to form several smaller panels.