Auxiliary supporting device of workpiece

The invention relates to the machine tool field, in particular to an auxiliary supporting device of a workpiece. The auxiliary supporting device is provided with a rotary work table. The auxiliary supporting device is characterized in that the device is provided with an auxiliary work table and roller supporting devices, wherein the auxiliary work table is provided with a radial positioning hole; a positioning bolt penetrates through the radial positioning hole to ensure that the auxiliary work table is fixedly connected with the rotary work table; the auxiliary work table and the rotary work table have the same axis; the roller supporting devices are uniformly distributed on the periphery of the auxiliary work table; each roller supporting device consists of a spiral elevator, a supporting base, a roller shaft, a bearing and a roller; the spiral elevator is arranged on the foundation of the machine tool, the upper end of the spiral elevator is fixedly connected with the supporting base; the upper part of the supporting base is provided with a groove; the roller is arranged in the groove; the roller is fixedly connected with the roller shaft fixed on the supporting base through the bearing, and the top end of the roller contacts with the auxiliary work table in a rolling manner. The invention adopts the structure, thus the workpiece diameter processing extent and maximum load of the rotary work table are increased obviously and the processing accuracy of the large diameter workpiece is increased; and multipoint manual leveling is adopted so that the leveling operation is convenient, quick and accurate; and the split-type structure is easy to dismantle and convenient to transport.