Arm section, arm support and working machine

The utility model relates to the field of arm frame action, and provides an arm section, an arm frame and an operation machine, the arm section comprises an arm body, an emergency pipeline and a telescopic assembly, and an inner cavity is formed in the arm body; the telescopic direction of the telescopic assembly is consistent with the length direction of the arm body, the fixed end of the telescopic assembly is installed in the inner cavity, and the telescopic end of the telescopic assembly is connected with the emergency pipeline. In order to overcome the defects that in the prior art, an arm support emergency control device cannot achieve arm support recycling under the extreme power-off condition, and operation is inconvenient, according to the arm section, an emergency pipeline is arranged in an inner cavity of an arm body, and when an operation machine is in the extreme condition, the emergency pipeline is connected with an external hydraulic system; a plurality of arms of the operation mechanical arm f