The invention relates to the technical field of tower cranes, and discloses a connecting device convenient to adjust and use for a tower crane. The connecting device comprises a sleeve, a transmissionbox and a connecting box, telescopic columns are inserted into the left side and the right side of an inner cavity of the sleeve in a transverse sliding mode, limiting grooves are vertically formed in the middles of the ends, away from the sleeve, of the two sets of telescopic columns in a penetrating mode, movable plates are vertically and slidably arranged in inner cavities of two sets of limiting sliding holes correspondingly, limiting columns are symmetrically, transversely and fixedly welded to the upper sides and the lower sides of the side faces, away from the sleeve, of the two sets of movable plates, and rope penetrating holes are transversely formed in the middles of the two sets of telescopic columns correspondingly in a penetrating mode. In the actual using process of the connecting device, by adjusting the lengths of the telescopic columns stretching out of the sleeve and rotating a rotating disc, two sets of tower crane supporting joints can be fixedly connected, fixed connection work of the tower crane supporting joints is greatly facilitated, the danger coefficient of the fixed connection work of the tower crane supporting joints is effectively decreased, and meanwhile the difficulty degree of the fixed connection work of the tower crane supporting joints is decreased.

本发明涉及塔吊技术领域，公开了一种便于调节使用的塔吊用连接装置，包括套管、传动盒和连接管；所述套管内腔左右两侧横向滑动插入有伸缩柱，两组所述伸缩柱远离套管的一端中部均竖向贯穿开设有限位槽，两组所述限位滑孔内腔均竖向滑动设置有移动板，两组所述移动板远离套管的一侧面上下两侧对称横向固定焊接有限位柱，两组所述伸缩柱中部均横向贯穿开设有穿绳孔。本发明在实际使用的过程中，通过调节伸缩柱伸出套管的长度和转动转盘就可以对两组塔吊支撑节进行固定连接，大大方便了塔吊支撑节之间的固定连接工作，且有效的降低了塔吊支撑节固定连接工作的危险系数，同时降低了塔吊支撑节固定连接工作的困难程度。