升降貨梯在使用一段時間后，容易出現雜音，設備出現尖叫聲的主要原因：

1、升降貨梯滑塊磨損嚴重或潤滑狀況較差，因非正常使用造成絲桿變形，使絲桿螺母運動過程發生抖動。
Zhejiang Huoti slider badly worn or poor lubrication conditions, because of the non-normal use screw deformation, so that the screw nut jitter occurs during exercise.

2、螺母磨損嚴重，升降貨梯導軌工作面有雜質雙柱舉升機的保險裝置包括哪些內容包括上、下限位行程開關、安全螺母、同步保險裝置、三角帶超負荷打滑、托臂自鎖、二級臂限位螺釘、托盤限位套。
Nuts badly worn, Zhejiang rail freight elevator impurities Face Lift safety device includes two columns which includes upper and lower position limit switch, safety nut, synchronous safety device, belt slippage overload, corbel self-locking, two limit screw arm, tray limit sets.