The invention relates to a sequential extension system for telescopic booms of a lorry-mounted crane. The sequential extension system comprises the multiple stages of telescopic booms arranged from thick to thin, each stage of telescopic boom is driven by a telescopic oil cylinder corresponding to the stage of telescopic boom, rodless cavities of all the telescopic oil cylinders are connected in series, and pressure limiting valves are arranged on rod cavity oil return paths of the telescopic oil cylinders corresponding to the second-stage telescopic boom and the remaining telescopic booms following the second-stage telescopic boom. Compared with the prior art, a starting value of the next-stage boom is increased through the pressure limiting valves, and it is guaranteed that the previous-stage boom extends out preferentially; and therefore, each time the telescopic boom extends out, the thicker section extends out preferentially, the safety and reliability in the extending-out processare greatly improved, the structure is simple, and arrangement is convenient.
本发明涉及一种随车吊机伸缩臂顺序伸出系统,包括从粗到细设置的多级伸缩臂,每级伸缩臂均由该级伸缩臂对应的伸缩油缸驱动,各伸缩油缸的无杆腔串联,二级及之后的伸缩臂对应的伸缩油缸的有杆腔回油路上设有限压阀。与现有技术相比,本发明通过限压阀提高后级臂启动值,保证前级臂优先伸出;从而达到每次伸缩臂伸出时是较粗的一节优先伸出,大大提高了伸出过程中的安全可靠性,而且结构简单,布置方便。
Sequential extension system for telescopic booms of lorry-mounted crane
一种随车吊机伸缩臂顺序伸出系统
2020-12-11
Patent
Electronic Resource
Chinese
Folding jib type lorry-mounted crane multi-cylinder sequential telescopic hydraulic system
European Patent Office | 2020
|Hook retracting device of lorry-mounted crane and lorry-mounted crane
European Patent Office | 2020
|