The invention discloses a valve group, a lifting appliance leveling hydraulic system, a control method and device of the lifting appliance leveling hydraulic system and a crane. The valve group comprises an electromagnetic directional valve, an electromagnetic valve, a pressure reduction overflow valve, an electric proportional directional valve, a bidirectional balance valve, a first one-way throttle valve, a second one-way throttle valve, a one-way valve, a control valve group port A, a control valve group port B, a control valve group port P and a control valve group port T, the electromagnetic valve is connected in series with the one-way valve and then connected in parallel with the decompression overflow valve; an oil inlet P of the electric proportional reversing valve is communicated with a P port of the control valve set, and an oil return T port of the electric proportional reversing valve is communicated with a T port of the control valve set. According to the lifting appliance leveling hydraulic system, the lifting appliance is adaptive to the amplitude change of the arm support, and multi-stage or stepless leveling is achieved; passive leveling can be achieved to meet the driving working condition, and active leveling can be achieved to adapt to the diversity of boom speed changes. The two-way locking of the leveling oil cylinder can be realized, and a lifting appliance and a lifted object can be supported.
本发明公开了一种阀组、吊具调平液压系统及其控制方法和装置及起重机,阀组包括电磁换向阀、电磁阀、减压溢流阀、电比例换向阀、双向平衡阀、第一单向节流阀、第二单向节流阀、单向阀、控制阀组A口、控制阀组B口、控制阀组P口和控制阀组T口,电磁阀与单向阀串联后与减压溢流阀相并联;电比例换向阀的进油P口与控制阀组P口相接通,电比例换向阀的回油T口与控制阀组T口相接通。本发明吊具自适应臂架的幅度变化,实现多级或者无级调平的吊具调平液压系统;既能被动调平满足行使工况,又能主动调平适应臂架速度变化的多样性;能实现调平油缸双向锁定,对吊具及吊物起到支撑作用。
Valve group, lifting appliance leveling hydraulic system, control method and device and crane
一种阀组、吊具调平液压系统、控制方法和装置及起重机
2022-11-01
Patent
Electronic Resource
Chinese
European Patent Office | 2021
|Lifting appliance lifting method, lifting appliance and crane
European Patent Office | 2022
|