The invention relates to the technical field of hoisting equipment, in particular to a stable fixed column type slewing crane which comprises a main beam, a slewing arm rotationally matched with the top of the main beam and a lifting mechanism slidably matched with the slewing arm in the length direction of the slewing arm. The tail end of the rotating arm is connected with a middle connecting seat which is in sliding fit with the rotating arm in the length direction of the rotating arm through a first folding arm, and the middle connecting seat is connected with the lifting mechanism through a second folding arm; the lifting mechanism comprises a lifting machine base, two lifting base side plates located on the outer side of the rotary arm and fixed to the lifting machine base, a lifting base connecting beam connected between the two lifting base side plates and penetrating through the connecting beam hole, lifting base wheels rotationally connected to the inner sides of the lifting base side plates, and a lifting rod. The two sections of folding arms are movably matched on the cantilever, the gravity borne by each section can be shared through the structure of the two sections of folding arms, the bearing of the rotating arm is shared to the middle connecting base and the lifting mechanism, the bearing capacity and the anti-bending capacity of the rotating arm are improved, and the stability is good.

本发明涉及吊装设备技术领域，尤其涉及一种稳定型定柱式旋臂起重机,包括主梁、转动配合在主梁顶部的旋臂、沿旋臂的长度方向滑动配合在其上的提升机构；旋臂的尾端通过第一折叠臂连接有沿旋臂的长度方向滑动配合在其上的中间连接座，中间连接座通过第二折叠臂与提升机构连接；提升机构包括提升机座、两个位于旋臂外侧并与提升机座固定的提升座侧板、连接在两个提升座侧板之间的贯穿连接梁孔的提升座连接梁、转动连接在提升座侧板内侧的提升座轮、提升杆。两段折叠臂活动配合在悬臂上，两段折叠臂的结构可以分摊每一段承受的重力，将旋臂的承重分摊到中间连接座和提升机构两处，提高了旋臂的承重能力和抗弯折能力，稳定性佳。