| 摘要 |
Improvements to the automatic device for the continuous production of electrically welded tridimensional metallic lattice girders, particularly those having an isosceles triangle cross-section. These improvements affect: the bending assembly and the underlying electric welding assembly (16), which is fixed with a distance of the electrodes (6, 7) that is adjustable in relation to the spacing of said lattice girder, for the simultaneous electric welding of the two bent lateral segments (1) to the two lower longitudinal members (5) of the lattice girder being formed; a lower movable slider (11) with automatic stroke for the forward advancement, with programmed spacings (P), of the two lower longitudinal members (5) together with the welded lateral bent segments (1); and finally the use of two cutting assemblies, one for each lower longitudinal member, capable of trimming the downward protrusions of the ends (1.1) of the welded segments (1). The movable slider (11), in addition to causing the advancement of the lower longitudinal members by the chosen spacing, positions them in the upper electric welding region (9), where simultaneous welding (10) of the central upper longitudinal member (15) to the bending points of the two lateral bent segments (1) occurs, again automatically, thus providing the permanent connection between the two lower longitudinal members (5) and the upper one (15). These improvements provide considerable advantages: by reducing production times, they also allow the height variation of the lattice girder being manufactured, they reduce maintenance in general and in particular electrode maintenance, improve the quality of the finished product, and finally ensure greater safety of the automatic device. |
