The cranes are an industrial process for transporting mechanical equipment or other objects from one place to another. Most lifting machinery starts a vertical or vertical and horizontal working stroke after the spreader retrieves materials. After arriving at the destination, it is unloaded, and then empty travels to the picking location to complete a working cycle, and then carries out the second lifting. Generally speaking, when the lifting machinery is working, material picking, transportation and unloading are carried out in sequence, and the work of each corresponding mechanism is intermittent.  Hoisting machinery is mainly used to transport items. When equipped with a grab bucket, it can transport bulk materials such as coal, ore, and grain. When equipped with a bucket, it can lift liquid materials such as molten steel.  Some lifting equipment such as elevators can also be used to carry people. In some use cases, lifting equipment is also the main operating machinery. For example, cranes used for loading and unloading materials in ports and stations are the main operating machinery.