The 3-ton spider crane is a lifting equipment used for heavy construction and engineering projects. It usually has the characteristics of large height and span, and strong lifting capacity. Spider cranes are commonly used on construction sites for hoisting, lifting and moving heavy construction materials such as steel beams, concrete members and other large structures. They can also be used for lifting operations in bridge construction, dock loading and unloading, and other large engineering projects. The role of the spider crane is to improve the efficiency of project construction and ensure the safe and reliable completion of the lifting and transportation tasks of heavy objects.