A semi gantry crane is a gantry crane with one leg running along a ground track while the other end of the bridge is supported by a truck running along an overhead track.

Semi gantry cranes, with their unique structure and practicality, have become an indispensable member of modern industry. It is particularly suitable for light and medium-duty lifting tasks, such as cargo loading and unloading, machine equipment maintenance, various applications in docks and factories, etc.

Enkeltbjælke portalkranen er hovedsageligt sammensat af en bro (fjernbom), fire støtteben, underbjælke, vogndrevenhed, elektrisk styring, elektrisk hejs osv. Brorammen (fjernbom) på en enkelt-bjælke portalkran er generelt en kasseformet struktur svejset af stålplader. Bunden af fjernbommen er forsynet med I-bjælkeskinne til elektrisk hejsedrift. Den kan også bruges til hovedbjælken på portalkraner med stort spænd, der arbejder udendørs. Spærstrukturen dannet ved svejsning af sektionsstål har stærk stivhed (især den vandrette stivhed), let vægt, lille vindoverflade og har høje økonomiske fordele. Imidlertid er produktionen og svejsningen af denne struktur mere kompliceret og vanskelig end den kasseformede struktur.

Semi-gantry crane is suitable for lifting, transporting, loading and unloading in open-air working places such as stations, docks, warehouses, construction sites, cement product yards, machinery or structural assembly yards, power stations, etc. It is also suitable for working in indoor workshops.

The jib of a crane is an extension or an arm that protrudes from the main body of the crane. It is an important component that enhances the crane's reach and lifting capabilities.

Jib cranes, also known as swing cranes, are versatile lifting devices widely used in various industries.