Lower die fixing device of pipe making machine for large-diameter steel pipe production

The utility model relates to the technical field of pipe making machine lower die fixing, in particular to a pipe making machine lower die fixing device for large-diameter steel pipe production, which comprises a workbench, a lower die is placed at the upper end of the workbench, and the left end and the right end of the lower die are fixedly connected with mounting plates. The lower ends of the two mounting plates are fixedly connected with two mounting blocks which are symmetrically distributed in the front-back direction, inserting holes are formed in the left end faces of the multiple mounting blocks, two sets of mounting grooves which are symmetrically distributed in the front-back direction are formed in the upper end face of the workbench, and two sliding grooves which are symmetrically distributed in the front-back direction are formed in the lower end face of the workbench. The two sliding grooves communicate with the two sets of mounting grooves correspondingly, inserting assemblies are mounted in t