The utility model discloses a composite arm support in the technical field of
engineering machinery, and aims to solve the problems that a
concrete pump truck arm support in the prior art is usually made of steel, and the
dead weight of the steel is larger, so that a
chassis required by a pump
truck is heavier, and the lightweight requirement of the arm support is difficult to meet. The
robot arm comprises a box body, an arm head and an arm
tail are arranged at the two ends of the box body respectively, the box body, the arm head and the arm
tail are each of a composite layer structure, and each composite layer structure comprises a supporting layer and a
protection layer arranged on the supporting layer; the supporting layer is made of
carbon fibers; the supporting layer is protected by the protective layer in all directions, so that the
carbon fibers are not exposed outside, the defect that the
carbon fibers are sharp and easy to damage is avoided, the characteristics of
low density, high strength, high
elastic modulus and good weight reduction effect of the carbon fibers are utilized, and the overall structure of the
cantilever crane is lightened through the matching of the supporting layer and the protective layer; the requirement for light weight of the arm support is met, and meanwhile it is guaranteed that the arm support is high in structural strength and rigidity.