用两个步进电机，中间的绳索拉动重物，可以通过51控制其运行轨迹，譬如：圆，直线，矩形，并能实时显示重物坐标。-With two stepper motors, the middle Shengsuo La moving heavy objects, you can run 51 to control its trajectory, such as: round, linear, rectangular, and can coordinate real-time display weights.