FOLDABLE BOOM STRUCTURE AND ENGINEERING MACHINERY

摘要

A foldable boom structure and engineering machinery having the foldable boom structure. The foldable boom structure comprises a first boom (10) and a second boom (20). The first boom (10) has a first cord member (11) and a second cord member (12) at two sides. The second boom (20) has a third cord member (21) and a fourth cord member (22) at two sides. The first cord member (11) is pivotably connected to the third cord member (21), so that the first boom (10) and the second boom (20) can be folded or unfolded together. A pivotably rotary locking device (30) is disposed on the second cord member (12), and the locking device (30) comprises a hook-shaped member (31) and a mass body (32) connected to the hook-shaped member (31). A locking joint member (23) is disposed on the fourth cord member (22). When the first boom (10) and the second boom (20) are unfolded and tilt relative to the horizontal plane, the locking joint member (23) is capable of joining the hook-shaped member (31), so as to be stopped by the hook-shaped member (31), thereby preventing the first boom (10) and the second boom (20) from being folded. The locking device can automatically perform locking or unlocking according to the position of the first boom (10) and the position of the second boom (20), thereby facilitating folding and unfolding, and structurally simplifying the foldable boom structure.