Patent ID: 11911961
Assignee: NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS
Field: Other special machines (Mechanical engineering)
Classification: CPC B  Y | IPC B

Claim 0:
1. An additive manufacturing device for an aerospace truss, comprising a raw material input unit, a longitudinal beam forming unit, a longitudinal beam traction unit, a cross beam forming unit and a truss support unit arranged sequentially, wherein
the raw material input unit comprises an upper roller, a lower roller located below the upper roller, several conveying pressure rollers arranged sequentially from top to bottom, and a guide plate; one end of each of the several conveying pressure rollers is connected to a feeding stepper motor;
the longitudinal beam forming unit comprises three mold sets, which are arranged in a triangle;
each mold set comprises several molds, heating rods, a ceramic tube and a support plate, and is connected to the support plate through the ceramic tube; the heating rods are mounted in holes of the molds; each mold has an upper mold structure and a lower mold structure, which form a V-shaped angle;
the V-shaped angle in each mold set gradually decreases from front to back; and
the longitudinal beam traction unit comprises a traction stepper motor, a coupling, a transmission shaft and an upper support frame; wing plates are distributed on two sides of the upper support frame; an angle between each wing plate and a middle plate of the upper support frame is 60°, and each wing plate has two through holes for fixing a left and right upper power output shaft and an upper driven shaft that are arranged in parallel; an end of the left upper power output shaft is arranged on a left support plate and connected to a first bevel gear; an end of the right upper power output shaft is arranged on a right support plate and connected to a second bevel gear; a first gear and a first concave wheel are sequentially arranged on each upper power output shaft; a second gear and a first convex wheel that cooperate with the first gear and the first concave wheel are sequentially arranged on the upper driven shaft; the stepper motor is connected to the transmission shaft through the coupling; the transmission shaft is sequentially mounted on the left support plate and the right support plate; a third bevel gear and a fourth bevel gear that mesh with the first bevel gear and the second bevel gear separately are sequentially arranged on the transmission shaft; a lower driven shaft parallel to the transmission shaft is mounted on the left support plate; a third gear and a second convex wheel are sequentially arranged on the lower driven shaft; the third gear and the second convex wheel cooperate with a fourth gear and a second concave wheel on the transmission shaft separately; a center line of the second convex wheel is coaxial with a center of the middle plate of the upper support frame; the cross beam forming unit is composed of a motion module and a printing module; the truss support unit is composed of support conveying rollers and a support frame with two ends; a support conveying roller is arranged at each end of the support frame with two ends; and a shape of the support conveying rollers matches an inner surface of a truss longitudinal beam.