Velike portalne dizalice najčešća su oprema za dizanje i rukovanje koja se koristi u industriji i građevinarstvu. Često se koriste za zadatke dizanja i premještanja teških tereta u industrijskim okruženjima kao što su luke, gradilišta i proizvodni pogoni. Portalni kranovi opremljeni su mehanizmom za podizanje koji može podizati i spuštati teške predmete. Mehanizam obično uključuje sustav dizalice ili vitla, koji može biti električni, hidraulički ili pokretan na neki drugi način, ovisno o dizajnu dizalice. Karakterizira ga visoka, čvrsta čelična konstrukcija koja se proteže kroz čitavo područje, poduprta nogama ili stupovima s obje strane.

Gantry cranes are widely used in various industries of the national economy such as metallurgy, electric power, ports, logistics, machinery manufacturing and marine engineering. They are important process equipment for industrial production and are related to the safety of people's lives and the safety of national economic operations. and social stability are important components of public security in all countries. The development momentum of my country's hoisting machinery industry is strong. As of the end of 2017, the number of hoisting machinery in my country reached 2.2375 million units. According to the "Notice of the State Administration for Market Regulation on the Safety Status of National Special Equipment in 2017", the accident rate and fatality rate of cranes in my country rank first among the eight categories of special equipment. Therefore, there is an urgent need for an effective means to ensure the safety of in-service cranes. Safe and reliable operation of machinery.