Single chord bar anti-twisting device and truss welded steel bar anti-twisting device

The invention belongs to the technical field of steel bar trusses and particularly relates to a single chord bar anti-twisting device and a truss welded steel bar anti-twisting device. The single chord bar anti-twisting device comprises a vertically arranged upper anti-twisting base plate; an upper double-hole bottom plate is vertically connected to the front side face of the upper anti-twisting base plate; a first extrusion mechanism and a second extrusion mechanism which are used for preventing a chord bar from moving left and right are movably arranged on the upper double-hole bottom platein a penetrating mode; the lower end of the first extrusion mechanism is movably connected with a first knurling pressing wheel; the lower end of the second extrusion mechanism is movably connected with a second knurling pressing wheel; the first knurling pressing wheel is located above the second knurling pressing wheel; a chord bar conveying channel used for extruding the chord bar is formed between the first knurling p