Yongmao STT293

The Yongmao STT293 is a heavy-duty topless tower crane engineered for high-performance lifting in urban and industrial construction environments. With a maximum lifting capacity of 18 tonnes, it excels in applications that require both capacity and reach. The crane is capable of extending to a maximum jib length of 74 meters, and at this reach, it maintains a tip load of approximately 2.16 tonnes under single trolley configuration, showcasing a well-balanced performance curve throughout the working radius.

This flat top design eliminates the classic tower head, making it especially suitable for job sites with height restrictions, multi-crane setups, or airspace limitations. It is modular in structure, allowing compatibility with different mast systems such as H205B and L69B1. For example, the H205B system supports greater freestanding heights and is more robust for taller configurations, while the L69B1 system is optimized for medium-height projects with efficient tower integration.

The STT293 offers several configurations of hoisting mechanisms to suit different lifting needs. For the 18-tonne version, hoisting speeds vary from 0–38 m/min to 0–160 m/min, depending on the selected winch model (e.g., 75LFV45D, 75LFV45DB1). Each hoisting mechanism supports multiple reeving options (e.g., 6:1, 4:1, 2:1), allowing the user to choose the optimal trade-off between lifting speed and capacity. Load lines are typically supported by high-performance motors up to 75 kW, and lifting heights range from 550 meters up to over 1,000 meters, depending on hoist configuration and drum size.

In terms of slewing, the crane operates with variable speed slewing motors (up to 2×10 or 2×145 Nm torque configurations), offering a slewing range of 0–0.8 rpm, ensuring smooth and precise load positioning. Trolley travel speeds range from 12.5 to 25 m/min, powered by 4×2.6/5.2 kW motors, depending on configuration and trolley type.

The STT293 is engineered for efficient setup and dismantling, utilizing compact tower sections and optimized modular connections. The tower system includes standard mast dimensions, such as 2.27 x 2.29 meters for H205B and 2.32 x 2.34 meters for H205A, allowing it to integrate into existing Yongmao tower crane systems with minimal retrofitting.

For electrical supply, it is rated for 380V (±5%) at 50/60 Hz, with power demands ranging from 110 to 160 kVA, depending on the motor selection. The design includes provisions for both internal climbing (within elevator shafts) and external climbing systems, offering adaptability across building core construction methods.

In conclusion, the Yongmao STT293 combines heavy-lift capability, modern topless design, and flexible modularity. With high-capacity hoisting, extended jib reach, and strong wind resistance (backed by robust mast systems), the STT293 is a solid choice for high-rise building construction, urban infrastructure development, and multi-crane environments where space and safety are critical.