外文翻译--混凝土泵车液压系统的认识.docVIP

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 diagram Daily check and maintenance of the hydraulic system The 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 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 solenoid. 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 bar S Suction port (with charging pump) 35 bar T1, 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 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 pressure is 3.5Mpa in A4VG180. The auxiliary pump has two output ways. One is the charge oil line, which connects with suction line