Cantilever crane device and concrete pump truck

The utility model relates to concrete conveying equipment, and discloses an arm support device which comprises a tail section conveying pipe (4), a front section conveying pipe (11), a front section arm support (10) and a rotating device (1), and the front section conveying pipe (11) and the tail section conveying pipe (4) are arranged on the two sides of the front section arm support (10) respectively. And the rotating device (1) can drive the tail section of conveying pipe (4) to rotate by 360 degrees relative to the previous section of cantilever crane (10). In addition, the utility model further relates to a concrete pump truck. According to the cantilever crane device, 360-degree rotation of the tail section conveying pipe can be achieved, the weight of the whole cantilever crane device can be reduced, arrangement of bent pipes can be reduced, and therefore the pipe outlet pressure loss of concrete at the tail end of the cantilever crane is reduced. 本实用新型涉及混凝土输送设备，公开了一种臂架装置，包括末节输送管(4)、前一节输送管(11)、前一节臂架(10