What does the port gantry crane mean?

Port portal crane is a kind of portal crane, also known as portal crane and portal crane, and it is one of the boom cranes driven by electricity and running on the track. Its structure can be roughly divided into two parts: the upper rotating part and the lower running part. The upper rotating part is installed on a tall portal underframe (gantry) and can rotate 360' at will relative to the lower operating part. Gantry can run along the track and is also the load-bearing part of the crane. The self-weight and lifting load of the crane are borne by the gantry and transferred to the ground track by the gantry. The portal crane is named after this portal.