Rotary platform device

A rotary platform device, comprising:

• a rotatable platform (1) having a top surface and a bottom;
• a rotatable annular base (2) disposed at the bottom of the platform (1);
• wherein,
• the top surface of the platform (1) has a plane for placing objects, and the platform (1) has an annular first groove (11) facing downward at the bottom of the platform (1), the annular first groove (11) has a top wall and two side walls;
• the annular base (2) is disposed inside the annular first groove (11) and is capable of rotating circumferentially along the annular first groove (11);
• a plurality of first balls (3) each having a top portion and a side portion is rotatably arranged at regular intervals on the annular base (2) circumferentially along the annular base (2), the top portion of each first ball (3) attaches to the top wall of the annular first groove (11) and the side portion of each first ball (3) attaches at least one of the two side walls of the annular first groove (11);
• and
• a plurality of second balls (4) each having a top portion and a side portion is arranged at regular intervals on the annular base (2) circumferentially along the annular base (2), the top portion of each second ball (4) attaches to the top wall of the annular first groove (11).