opsætningsorgan for use in the manufacture of a ventilformet flammekammer for brænderdysen to a boiler.

摘要

For use in the course of forming a venturi-shaped flame-ignition throat in a venturi-shaped duct in a boiler, the jug being used for the positioning of studs for welding to circulation tubes so as to extend from the latter inwards in the direction of the duct axis, the tubes being disposed in banks at each of two diametrically opposed regions of the duct in non-contiguous relationship over the major parts of their lengths with their axes following the curvature of the duct in planes normal or substantially normal to said circulation axis, the jig comprising an internally-braced metal ring of diameter to fit with clearance within the smaller diameter end of either one of the truncated conical lengths of the duct, L-shaped support brackets secured to the external periphery of said ring at circumferentially spaced locations and providing first limbs parallel to the ring axis and outwardly projecting second limbs spaced from and parallel to radii of said ring, the first limbs being adjustable in length and the second limbs having therein elongate holes enabling positional adjustment relative thereto of locating studs welded to the circulation tubes closest to the larger diameter end of said either one truncated conical length of the duct to fix the jig in position, sections of a frusto-conical skirt also secured to the external periphery of the ring and mounting mandrel-guiding tubes whereof, in use, the axes are normal to the axes of other circulaton tubes at said two opposed regions and mandrels insertable through said tubes and having tapped ends into which are adapted to be screwed studs to be welded to said other circulation tubes.