Box beam, arm support, outrigger and engineering machine

Abstract

The invention provides a box beam. The box beam has a box structure defined by a plurality of plates, wherein a composite plate is at least arranged on the tension side of the box beam. According to the box beam, the mechanical property of a cross section of the box beam under the cantilever condition is fully utilized, and the composite plate is at least arranged on the tension side of the box beam; compared with the prior art that the composite plate is adhered on the outer surface of a steel plate, the box beam has essential differences, the steel plate of the original box beam is removed, the tension acting force of the box beam is completely born by the composite plate, and the characteristic of high tension intensity of the composite plate is fully exerted, so that the integral intensity of the box beam is improved; and the composite plate instead of the steel plate is arranged on the tension side of the box beam, so that the weight of the box beam can be greatly reduced while the bearing property and the loaded property of the box beam are improved. The invention also provides an arm support, an outrigger and an engineering machine which comprises the arm support and / or the outrigger.

Description

technical field [0001] The present invention relates to the field of engineering machinery, more specifically, to a box girder, a boom made of the box girder, a support leg, and a construction machine including the above boom and / or support leg. Background technique [0002] The boom of the concrete pump truck belongs to the box-shaped beam structure, which needs to be suspended horizontally during operation. Under the working condition of the cantilever, the box-shaped beam must bear a huge bending moment, and the neutral layer of the box-shaped beam bears a huge tensile force. Therefore, it is necessary to use a thicker plate to bear the tensile stress to ensure the strength and rigidity of the boom. Therefore, the plates of existing booms are generally thicker, which not only increases the weight of the boom, reduces the flexibility of the boom, but also wastes materials and increases manufacturing difficulty. In addition, the weight of the boom itself further constitute...

AI Technical Summary

Problems solved by technology

In the above technical solution, the composite material is placed on the outer surface of the steel plate, and the composite material is only used as an auxiliary reinforcement structure. The high-strength performance of the composite material plate has not been fully utilized, and the weight of the steel plate still occupies a large part of the entire boom load. There is still a lot of room for improvement in the lightweight design of the jib

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