電液比例控制的雙缸液壓升降機[外文翻譯]

    摘要:一個電液控制的液壓升降機的大型機車需要在這個機車的兩邊安裝兩個對稱的油缸。摘要報道了一種電液系統(tǒng)的設(shè)計主要包括三個流體控制比例閥。機車的速度調(diào)節(jié)和兩油缸的同步控制也是呈遞的。一個假微分反饋(PDF)控制器以獲得一個機車的速度模式來證實和給定的這個接近。兩油缸的非同步性的誤差范圍在±2之內(nèi)由于有比例控制器來拘泥每一步。一個電磁鐵操縱的單向閥,即液壓鎖,被發(fā)明以防止機車下沉并允許反方向流體容易流動。
關(guān)鍵詞:液壓升降機;速度跟蹤;同步化;液壓鎖

Electro-hydraulic proportional control of twin-cylinder hydraulic elevators
Abstract
The large size of the cab of an electro-hydraulic elevator necessitates the arrangement of two cylinders located symmetrically on both sides of the cab. This paper reports the design of an electro hydraulic system which consists of three flow-control proportional valves. Speed regulation of the cab and synchronization control of the two cylinders  are also presented. A pseudo-derivative feedback  (PDF) controller is applied to obtain a velocity pattern of the cab that proves to be close to the given one. The non-synchronous error of the two cylinders is kept within ±2mm with a constrained step proportional-derivative (PD) controller. A solenoid actuated  non-return valve, i.e. a hydraulic lock, is also developed to prevent cab sinking and allow easy inverse-fluid flow.
Keywords: Hydraulic elevator; Velocity tracking; Synchronization; Hydraulic lock