On October 24, 2024, the financial sector reported that the information of the China National Intellectual Property Administration showed that Beijing No.3 Construction Engineering Co., Ltd. had obtained a patent entitled "rotary locking device of self elevating tower crane", the authorization announcement number was CN 221854038 U, and the application date was March 2024.

The patent abstract shows that the utility model discloses a slewing locking device for a self elevating tower crane, comprising an upper slewing part and a lower slewing part. The upper slewing part comprises a first upper vertical ear plate, a second upper vertical ear plate, and an upper horizontal ear plate, and the lower slewing part comprises a lower vertical ear plate and a lower horizontal ear plate; A rotary locking component comprising an upper rotary locking slot ear plate, the upper rotary locking slot ear plate comprising a first I-shaped vertical portion and a second I-shaped vertical portion, the first I-shaped vertical portion being in contact with the first upper vertical ear plate, and the first I-shaped vertical portion being disposed on a side away from the second upper vertical ear plate, and the lower rotary locking slot ear plate comprising a first vertical portion and a second vertical portion, the first vertical portion and the second vertical portion being clamped in the vertical direction on the lower vertical ear plate. This utility model effectively prevents the swing of the crane arm of the tower crane by setting a rotary locking component, which is not affected by adverse weather conditions, and improves the safe and smooth completion of the operation of the tower crane under the premise of a long installation and disassembly cycle.