闭式液压卷扬系统(很好的)解读.ppt

开式/闭式液压卷扬系统 典型应用： 吊车（包括汽车吊，履带吊及海洋平台吊） 测井车 牵张机 挖泥船 液压绞车等 专家预言：H1斜盘变量泵+H1弯轴变量马达 新世纪静液压传动的最佳匹配！ * * 开式履带吊液压系统的组成 * * Auxilliary winch GFT-W + A2FE Luffing Swivel drive GFB + A2FE Travel drive GFT + A6VE Diesel engine + A8VO + A10VG Closed Loop Winch DriveClassical System without MC * * 21-2189-e / VAV 10.99 A4VG A2FM Boost pressure surveillance switch Electronic Winch DriveClosed Circuit * * 21-2163-e / VAV 10.99 A2FM/E OptionsCounterbalance Valve for Winches (EPD)-Version * *  A2FM 2146-e / VAV 08.99 Type selection A2FM/E Example type code: MHB 20 EPD4X / BR 00 U08 A01 V18 Hoisting side AL BR Hoisting side Counterbalance valve Motor Gear usually inverts rotation Winch A6VM OptionsCounterbalance Valve for Winches (EPD)-Version * *  A6V 2189-e / VAV 08.99 Counterbalance valve Type selection A6VM...HD/HD.D/EP.D/EZ/HZ Motor Gear usually inverts rotation Winch Example type code: MHB 20 EPD4X / AL 00 U08 A01 V18 View on shaft Hoisting side Hoisting side BR AL A6VM OptionsCounterbalance Valve for Winches (EPD-Version) * * A6V 2187-e / VAV 08.99 Lifting Brake opened Single acting spool (with lifting side A) A6VM Options Counterbalance Valve for Winches (EPD-Version) * * A6V 2188-e / VAV 08.99 Lowering Brake opens at 18 bar Winch version: Start of opening at 20 bar Fully opened at 40 bar Load pressure captured between motor and motion control valve load supported by counterbalance valve A6VM OptionsCounterbalance Valve * * A6V 2184-e / VAV 08.99 Lifting Brake opened A6VM OptionsCounterbalance Valve * * A6V 2185-e / VAV 08.99 Lowering Hoisting Winch version: start of opening at 20 bar fully opened at 40 bar Load pressure captured between motor and counterbalance valve; load supported by counterbalance valve Lowering Brake opens at 18 bar 5-10 bar A6VM OptionsCounterbalance Valve * * A6V 2186-e / VAV 08.99 Uncontrolled lowering by motor leakage Brake closed Motor leaks Motor turns some 2 rpm Sucks B line empty Load falls down Therefore: Brak