1、重慶升降機的兩個油缸間距為2.5m，提升高度為1.2m，車前部比車后部重300kg，兩個活塞在偏載條件下要求上升和下降必須同步平衡運行。
Two cylinders Wenzhou freight elevator pitch is 2.5m, lifting height of 1.2m, before the car is heavier than the car rear 300kg, two pistons under partial load conditions require a balance must be synchronized rise and fall run.
   
2、貨梯用負載壓力反饋的原理可補償因負載變化而引起流量的變化，最后達到新的平衡，但它不能自動補償在負載變化的動態過程中所積累的位置誤差，只能起到控制流量分配的作用。
Wenzhou freight elevator with the principle of load pressure feedback can compensate for load changes caused by changes in flow, and finally reach a new equilibrium, but it can not compensate for position errors automatically load change in the dynamic process of the accumulated, can only play to control the flow distribution role.
   
3、貨梯為了控制和彌補位置誤差，在兩個油缸下限位置分別設置了一個行程限位開關，使兩個活塞在完成一個行程后，能自動調整一次位置誤差，保證每次重新啟動時都是從零位開始，因而滿足了位置精度條件。
Wenzhou freight elevators in order to control and compensate position errors in the lower position of the two cylinders are provided with a travel limit switch, so that the two pistons after completing a trip, can automatically adjust a position error, ensure that each time you restart all from zero start, and thus satisfy the positional accuracy of the condition.
   
4、貨梯車尾一邊活塞不會因負載輕而上升得快，車前部的活塞也不會因負載重而上升得慢。在不平衡負載條件下保持平衡同步上升和下降，實現了特有的功能，克服了車身翻轉下滑或抖動噪聲，運動平穩無噪聲。
Wenzhou Huoti rear side of the piston will not rise faster load is light, piston front car will not rise due to heavy load slowly. Kept under unbalanced load conditions balance has been rising and falling, to achieve a unique feature, the body overcome the decline or reversal dither noise, smooth movement without noise.