Tunnel boring machine hob lock adapting to hard rock stratum

A tunnel boring machine hob lock adapting to a hard rock stratum comprises a hob assembly (1), a cutterhead spoke structure (3), a cutter box (2) and a locking structure (6), and the locking structure comprises four pressing blocks (5), two tensioning blocks (7), two jacking plates (10) and fasteners. The two pressing blocks are connected with the inclined faces of the two sides of the tensioning block through concave-convex tenon structures respectively, and the tensioning block is connected with the jacking plate through bolts. The arc concave surfaces in the middles of the two tensioning blocks are connected with the hob body through bolts; welded threaded hole structures are mounted on steps on two sides of the jacking plate, and the jacking plate is connected with the welded threaded hole structures through bolts (11) with locking plates; the cutter box is installed on the four pressing blocks and the two welding type threaded hole structures. According to the utility model, the design is simple and prac