Variable-size fully-automatic 3D printing system based on cylindrical coordinate system

A variable-size fully-automatic 3D printing system based on a cylindrical coordinate system, comprising:

• a base, wherein the base is provided with a retractable work platform;
• the base is provided with a vertical support side plate on a side thereof;
• an upper end of the support side plate is connected to a top plate, and the top plate is located directly above the base;
• a lower side of the top plate is connected to a sleeve via a column seat;
• a lower end of the sleeve is provided with a protrusion;
• a lower end of the protrusion is connected with a cross beam;
• a lower side of the cross beam is provided with a ball screw a, one end of the ball screw a is connected to a power end of a first servo motor disposed at an outer end of the cross beam, and the other end of the ball screw a is connected to a ball screw seat a disposed within a sliding block;
• a nozzle is slidably connected to a cylindrical guide track a via the sliding block;
• each side of the ball screw a is provided with the cylindrical guide track a;
• the sliding block is further connected to the ball screw a and driven by the ball screw a,
• wherein the retractable work platform is configured to be adjusted a size based on a predetermined specification of printed objects,
• wherein the retractable work platform comprises a cylindrical retractable platform seat, an inner wall of the retractable platform seat is fixed with 12 sets of cylindrical guide tracks b facing the center of a circle;
• a center of the retractable platform seat is provided with a rotary table, and a central hole of the rotary table is provided with a lifting platform;
• a sloping guide track is disposed on a lower side of the spaced cylindrical guide track b;
• a transmission rod is disposed between an inner bottom surface of the retractable platform seat and a bottom of a sliding block plate;
• a clamping block plate is located between the two sliding block plates when the retractable work platform is extended, and the sliding block plate acts as a top platform surface of the retractable work platform when the retractable work platform is retracted, the clamping block seat is located under the clamping block plate;
• the rotary table is connected to a second servo motor and rotated under the drive of the second servo motor.