The invention relates to a balance valve. The balance valve comprises a servo actuating valve rod (5) and a gain adjustment control piston (1c), wherein the servo actuating valve rod is provided witha first hydraulic acting surface (S1) at a flow opening and closing part (S3) to bear axial hydraulic acting force towards a main spring cavity (6), and is also provided with a second hydraulic actingsurface (S2) exposed to a second oil cavity (8) or an oil cavity communicating with the second oil cavity to bear axial hydraulic acting force towards a piston cavity (12); and the axial effective compression areas (S1a, S2a) of the first hydraulic acting surface (S1) and the second hydraulic acting surface (S2) are equal. In addition, the invention also discloses a hydraulic cylinder control system, a crane and a lowering servo control method thereof. By adopting a special valve core structure and a control mode, the balance valve can realize servo control adjustment according to a control signal, the uniformity of the amplitude-variable lowering speed of the crane is improved, and the controllability of amplitude-variable lowering is improved.
本发明涉及平衡阀,其包括伺服作动阀杆(5)和增益调节控制活塞(1c),该伺服作动阀杆在开闭通流口部位(S3)形成有第一液压作用面(S1)以承受朝向主弹簧腔(6)的轴向液压作用力,且该伺服作动阀杆还具有暴露于第二油腔(8)或与该第二油腔连通的油腔的第二液压作用面(S2),以承受朝向活塞腔(12)的轴向液压作用力,其中第一液压作用面(S1)与第二液压作用面(S2)的轴向有效受压面积(S1a,S2a)相等。此外,本发明还公开了一种液压缸控制系统、起重机及其下放伺服控制方法。本发明采用特殊的阀芯结构及控制方式,使平衡阀可根据控制信号实现伺服控制调整,提高起重机变幅下放速度的均匀性,改善了变幅下放的操控性。
Balance valve, hydraulic cylinder control system, crane and lowering servo control method thereof
平衡阀、液压缸控制系统、起重机及其下放伺服控制方法
2020-05-19
Patent
Electronic Resource
Chinese
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