档是一种阻挡葫芦小车和轨道小车停止运行的装置。另外具有防止葫芦小车或轨道小车撞坏电缆小车的作用，让小车和电缆夹在轨道末端分离。

End stop is a device to stop the hoist trolley and track trolley stop running. In addition, it can prevent the hoist trolley and track trolley from damaging the cable trolley, so that the trolley and the cable can be separated at the end of the track.