Pneumatic balance crane, also known as power-assisted manipulator and manual transfer machine, is a novel power-assisting device for labor-saving operation of materials handling, especially suitable for some precise positioning and assembly action requirements. Application. Since the weight is in a floating state when it is raised or lowered, the operator can accurately place the weight in any position in the space without the need for a skilled jog button operation and pushing the weight with bare hands. With the "balanced crane" mainframe to balance the gravity of the material, coupled with the corresponding grab robot and mounting base, we have a complete "assisted robot" system. Therefore, we can easily grab any workpiece from a certain place, implement the corresponding process action, and then place it in another place according to the corresponding requirements, to achieve labor-saving operation. It subtly applies the balance principle of force to form a gravity-free state in the air, that is, the gravity of the workpiece is balanced by the corresponding air control system, so that the operator performs the handling operation on the workpiece. In the process, only a small amount of operating force is required.