1、混凝土泵车液压系统的认识外文文献翻译中英文翻译译文原文：Understanding of concrete pump hydraulic system Italian CIFA Concrete Machinery Company(1.CIFA concrete mechanical pump Institute, Italy)Pumping Hydraulic system Boom hydraulic system Outrigger hydraulic system Hydraulic system diagramDaily check and maintenance of the hy
2、draulic systemThe functions of the truck mounted concrete pump, hydraulic system can be divided into pumping hydraulic system, boom hydraulic system, outrigger hydraulic system.Pumping Hydraulic system Is divided into three parts: main pumping system, distribution and lubricating system, mixing and
3、cooling and cleaning system.Main pumping system There are two hydraulic loops: open and close loop.The Open loop: uses an A11VLO190 variable displacement of axial piston pump. It is fitted with a constant power control device, pressure cut-off valve and electrical stroke limiter with proportional so
4、lenoid. The constant power control device has been set in the factory. The displacement can be adjusted from 0 to Maximum by turning the oil pump displacement potentiometer on the control panel from low to high.Fig. 1 A11VLO 190 A，B Service port (without charging pump) 420 barS Suction port (with ch
5、arging pump) 35 barT1, T2 Air bleed, tank R Air bleed, oil drain M1 Measuring point, regulating chamber M Measuring point, service port G Port for positioning pressure (controller) for version with stroke limiter (H., U2), HD and EP with screwed fitting GE10 PLM (otherwise port G closed)The other is
6、 the control line, which can change the flow direction and the displacement of main pump through constant power valve, proportional solenoid pressure reducing valve, directional control valve and servo valve of main pump.The Closed loop: There is an auxiliary pump with relief valve that the setting
7、pressure is 3.5Mpa in A4VG180. The auxiliary pump has two output ways. One is the charge oil line, which connects with suction line of main pump through the check valve in two pressure relief valves and add oil to main pump. At the same time excessive hydraulic oil return to oil tank through flushin
8、g valve and cooler to realize heat exchange for closed loop.A, B Service line ports SAE 1 1/4, high pressure series 420 barT1 Case drain or filling portT2 Case drain M332; 18 deepMA, MB Pressure gauge - operating pressure A, BR Air bleedS Boost suction portX1, X2 Control pressure ports (before the o
9、rifice)G Pressure port for auxiliary circuitPS Control pressure supplyFa Filter outletFa1 Filter outlet (filter assembly)Fe Filter inlet M332; 18 deepFS Port from filter to suction line (cold start)MH Port for balanced high pressureY1, Y2 Remote control ports (only for HD control)Flushing valve Used
10、 for closed loop to prevent excessive heat build-up in closed circuit operation. The setting pressure of flushing valve is 3.0MPaPressure reducing valve with proportional solenoid Used for closed loop. The Output pressure is connected with the remote control port of main pump to control the displace
11、ment and is controlled by a proportional current signal and constant power valve. The displacement can be adjusted from 0 to Maximum by turning the displacement adjusting potentiometer. Constant power valve Pilot pressure setting Power settingUsed for closed loop. When the hydraulic system pressure
12、is over the setting pressure, the valve works to reduce the output pressure of the pressure reducing valve and maintain the constant power.Fig.3 Constant power valveMain pump suction filter Open loop: filtration fineness 100u.Close loop: filtration fineness 20u.When the indicator in the vacuum gauge
13、 exceeds the safe area or the electric signal instrument gives a warning, the cartridge may be blocked. It should be clean or replace filter cartridge promptly.Filter filtration fineness is 20u in open loop. When the reading pressure of the vacuum gauge exceeds 0.35Mpa, the cartridge may be blocked.
14、 It should be clean or Return filter replace filter cartridge promptly.Filter filtration fineness is 10u in closed loop. When the electricity deliver reports to the police, the cartridge may be blocked, it should be clean or replace filter cartridge promptly.Distribution and lubricating system Const
15、ant pressure pump Setting screw for pressure control zero /Stroke pressure Fig.4 Constant pressure pumpAn A10VO28 constant pump is used for the distribution system of supply oil. The setting of the pressure control valve of the pump is 16Mpa. Once the system pressure is reached, the bump will keep t
16、his pressure then decrease the displacement. There is a pressure relief valve in the distribution circuit to act as a safety valve, which is set to 18Mpa.Plate ball valve (shut-off valve)Used to discharge the accumulator. It must be rotated the lever of shut-off valve anti-clockwise when the pumping
17、 finishes or stopped for maintenance, in order to discharge the pressure of theaccumulator. (Pressure gauge of distribution system is zero)Accumulator Inflation pressure is 8-9Mpa. Use Only Nitrogen to fill the accumulator. Charging pressure should not exceed these figures.Lubricating system There a
18、re two types. One is reciprocating centralized lubrication that is driven by oil from the swing cylinders of distribution system includes lubricating single pump (or double pump), distributor, damper and filter. The other is automatic centralized lubrication that is driven by a D.C motor with an ind
19、ependent grease tank and independent from the hydraulic system. The interval time of lubrication is carried out in the factory. The lubrication system works automatically when pumping.Mixing, cooling, cleaning system Only the Mixing, cooling, cleaning system are driven by motor in open loop.Gear pum
20、p Gear pump supplies oil to the mixing, cooling, cleaning system.Sandwich type relief valve The pressure is set to 14Mpa.Ressure relay If the mixing blade is stuck, the system pressure will raise. When the pressure exceeds the setting value (usually 10Mpa), the pressure relay will give a warning. Th
21、e Solenoid directional control valve changes direction to let the mixing motor to rotate anti-clockwise. After 6 second the solenoid valve will reset, and the mixing motor will rotate clockwise again.Return filter The filtration fineness is 10u in closed loop. The cartridge may be blocked when the e
22、lectric alarm sounds. It should be replace promptly.Boom hydraulic systemBoom pump Boom and outrigger use the same pump.37m and 40m truck mounted concrete pumps: A2FO23 fixed displacement pump 44m and 47m truck mounted concrete pumps: A7VO55LRDS variable displacement pump, or A7VO55DRS variable disp
23、lacement pump46m and 49m truck mounted concrete pumps: A7VO55LRDS variable displacement pumpFig.5 A7VO55DRS Fig.6 A7VO55LRDS Fig.7 A2FO23Boom proportional directional spool valve The proportional directional spool valve with electro-hydraulic consists of pressure relief valve, pressure reducing valv
24、e, and flow control valve, and can be controlled manual or by remote control. Fig.8 Boom proportional directional spool valveLoad-holding valve Load-holding valve has three functions. (1) It acts as a lock when the cylinder isnt moving. (2) Load-holding valve has twice relief function to protect boo
25、m against vibrating. It will be adjusted in the factory. (3) When the boom moves downward as Slewing load-holding valve gravity load, it can limit speed to prevent the boom falling too quickly and shaking. There are three main functions. Lock, overload protection and speed limiting.Outrigger hydraul
26、ic systemOutrigger hydraulic system and boom hydraulic system are used the same pump to supply oil. Outriggers should be set up before the boom is operated by the control levers or electric control button on both sides of the truck mounted concrete pump.Outrigger proportional directional spool valve
27、 It is an integrated unit with a relief valve inside to control maximum pressure of the outrigger hydraulic system.Fig .9 Outrigger proportional directional spool valveOutrigger hydraulic lock It is used to lock the outrigger cylinders and pay attention to the vertical moving of the outrigger cylind
28、er when working .中文译文：混凝土泵车液压系统的认识 意大利 CIFA 混凝土机械公司（1.CIFA混凝土机械泵车研究所, 意大利，）泵送单元液压系统 臂架液压系统 支腿液压系统 液压原理图 液压系统的日常保养及维护泵车液压系统按泵车功能可划分为泵送单元液压系统、臂架液压系统、支腿液压系统。泵送单元液压系统泵送单元液压系统按功能可分为三大部分：主泵送油路系统；分配及润滑油泵驱动系统；搅拌、冷却、清洗油路系统。主泵送油路系统 主泵送系统按油液循环方式分为开式液压回路和闭式液压回路两种。主油泵 图1 泵A11VLO190开式液压回路：采用一个轴向变量柱塞泵，该泵带有恒功率控制装置、
29、压力截流阀和电控变量控制阀，恒功率控制装置出厂时已设定好。电控面板上油泵排量按钮由小变大范围内调节时，主油泵排量在0最大范围内变化。 A，B 工 作 油 口（不 带 升 压 泵） 420barS 吸油 口（带 升 压 泵） 35barT1, T2 放气 口，油 箱 R 放气 口，放 油 M1 变 量 缸 测 压 口 M 工 作 油 口 测 压 口 G 控 制 压 力 油 口对于 排 量可限制型（ HU2 ）和HD、EP带 紧固 螺栓 GE10-PLM（其他情况下油口G堵住） 闭式液压回路：采用A4VG180双向周向变量柱塞泵，该泵带内置补油泵，补油溢流阀调定压力3.5 MPa，其出口油路可分为
30、两路：第一路为补油油路，通过两高压溢流阀内的单向阀，始终与主泵吸油油路相通，对主泵送油路进行补油，同时多余的油液经冲洗阀、冷却器流回油箱，实现对闭式油路系统的热交换。 第二路为控制油路，经恒功率阀、电磁比例减压阀、换向阀及泵内伺服缸伺服阀，实现主泵的变量及液流流动方向的改变。图2 油泵A4VG180A, B 工作油口 SAE 11/4 高压系列 420barT1 壳体泄油或注油口T2 壳体泄油口 M332，深18MA, MB 压力表、工作压力A，BR 放气口 S 吸油口 X1, X2 控制压力口（在节流孔前）G 辅助回路压力口PS 控制压力供油口Fa 过滤器出口 Fa1 过滤器出口（装配过滤器） Fe 过滤器进口 M332，深18FS 从过滤器到吸油管的接口（冷启动）MH 平衡高压油口Y1, Y2 遥控口（仅对于HD控制）冲洗阀 仅用于闭式液压回路，用于实现闭式回路油液的交换。冲洗阀的设定压为为3.0 MPa电磁比例减压阀 仅用于闭式液压回路，其出口压力接主油泵远程控制口，控制油泵排量。出口压力受比例电流及恒功率阀的控制。遥控器或电控柜面板上油泵排量旋钮由小变大范围内调节时，主油泵排量在0最大范围内变化。恒功率阀 仅用于闭式回路，当回路工作压力超过设定压力时，恒功率阀起作用，减小电磁比例减压
