Four-link Portal Crane is a gantry crane with a four-bar mechanism, and its boom system consists of four links. This design enables the crane to have better stability and balance during operation, making it suitable for various complex working conditions.

　　1. Strong stability: The four-bar linkage mechanism design makes the crane more stable during operation and reduces shaking.

　　2. Large lifting capacity: capable of carrying heavy cargo and meeting the loading and unloading needs of large ports and shipyards.

　　3. Wide range of amplitude: The angle of the boom can be adjusted as needed to adapt to different working radii and heights.

　　4. Flexible operation: Equipped with advanced control system, it can achieve precise operation and joint action of multiple mechanisms.

　　5. High safety: Multiple safety devices such as overload limiters and windproof cables are installed to ensure the safety of equipment and personnel.