Built-run organizations to adopt the engineering plastics with Rolling Wheel, friction small, brisk walking, and the structure of small size, will help improve the vertical hook trip.

• 内置式行走机构采用带滚动轴承的工程塑料滚轮，摩擦力小、行走轻快，且结构尺寸小，有利于提高吊钩的垂直行程。