A blade mould assembly with lockdown mechanism for opening, closing or clamping blade mould assemblies is provided. The blade mould assembly includes a top mould portion, a bottom mould portion, and a lockdown mechanism. The lockdown mechanism includes an upper frame coupled to the top mould portion including an upper bearing device, a clamping pin extending substantially horizontally in the upper bearing device, and a lower frame coupled to the bottom mould portion. The lower frame includes a lower bearing device adapted to engage the under bearing device, a protractile rod, a latching element coupled to the protractile rod including a pivoting component, an inward clamping side, and an outward sliding side wherein the outward clamping side includes a pivoting recess and the inward clamping side includes a clamping recess. A guiding pin extends substantially horizontally in the pivoting recess when the protractile rod is fully extended.