A robot is an automated device that can mimic certain movements of the human hand and arm, using a fixed program to grasp, transport objects, or operate tools. It can replace humans in performing heavy physical labor, thereby achieving mechanization and automation of production, and can operate in hazardous environments to ensure personal safety. Consequently, robots are widely used in sectors such as mechanical manufacturing, metallurgy, electronics, light industry, and nuclear energy.

　　The robot ingeniously leverages the principle of force equilibrium: by applying appropriate push‑and‑pull forces, the operator can achieve balanced, precise positioning of heavy loads in space. During lifting or lowering, the load remains in a floating state, with pneumatic control ensuring virtually zero operational effort—though in practice, due to manufacturing tolerances and cost‑control considerations, the threshold is set at less than 3 kg. The required operating force varies with the workpiece’s weight. By simply pushing or pulling the load with their hands, the operator can accurately place it anywhere in space, eliminating the need for delicate jog‑type adjustments.

1. Production can be fully controlled according to schedule, ensuring fixed delivery dates for customers and maintaining strong business reputation and competitiveness.

2. The risk of accidental injury to robotic workers will be significantly reduced.

3. During normal production, the robot removes the molded parts, ensuring a fixed injection-molding cycle and resulting in greater product stability and higher quality.

4. Humans get tired, whereas robots do not; they require no rest and can particularly excel during night shifts.

5. With a streamlined team of production technicians and sound management practices, robot‑assisted human management can be achieved.

6. Implement a one‑person‑per‑machine system (including trimming sprues, deburring flash, and packaging); when integrated with conveyor systems, this further reduces labor requirements and lowers labor costs. Each injection molding machine can save one‑third to one‑half of the labor previously needed to sort finished parts from scrap material.

　　Robots are typically used as auxiliary devices for machine tools or other machinery, such as loading, unloading, and transferring workpieces on automated machine tools or production lines, or changing tools in machining centers; they generally do not have independent control systems. Some manipulators require direct human operation—for example, master–slave manipulators employed in the nuclear industry to handle hazardous materials are often also referred to as robots.