Management system using a bridge crane for loading an object onto a machine tool and unloading an object from the machine tool

A management system for loading and unloading an object, comprising:

• a plurality of machine tools, each including a base plate;
• a storage unit including a plurality of storage plates;
• an object holder detachably connected to one of said plurality of base plates and said plurality of storage plates, said object holder being configured to enable an object to be placed thereon;
• a conveying unit including
• a fetching unit that is configured to secure or release said object holder, and
• a bridge crane that is configured to move said fetching unit among a plurality of predetermined locations, each of the predetermined locations being associated with one of said base plates and said storage plates;
• and
• a control unit coupled to said plurality of machine tools, said storage unit and said conveying unit, and configured to
• control said bridge crane to move said fetching unit to one of the predetermined locations at which said object holder is located, and control said fetching unit to secure said object holder, and
• control said bridge crane to move said fetching unit along with said object holder to another one of the predetermined locations at which said object holder is to be moved, and control said fetching unit to release said object holder onto one of said base plates and said storage plates.