There is usually a precise mechanical transmission system inside the tube machine. This includes parts such as conveyor belts, chain or robotic arms. For example, conveyor belts work based on the principle of roller and motor drive. The motor drives the roller to rotate, and the roller moves the conveyor belt, and the test tube placed on the conveyor belt transmits in the set direction. The surface of the conveyor belt may have a special non-slip design to ensure that the tube does not slip during transmission. The design of the robotic arm is to realize the grasping and placement of the test tube through the cooperative movement of multiple joints. It is generally driven by the motor joint, and through the complex mechanical structure and control system, it can accurately locate the test tube in the three-dimensional space.