The invention provides a hydraulic lifting system and engineering machinery. A driving assembly is connected between a balance floating valve group and an oil path of a hydraulic oil tank in parallel, and a lifting oil cylinder is connected to the balance floating valve group in parallel; the oil suction filter, the stop valve, the plunger pump, the high-pressure filter and the lifting valve are sequentially connected between the hydraulic oil tank and the balance floating valve group; the pilot proportional valve controls the pressure at the two ends of the main valve element in the lifting valve, the opening amount of the main valve element is different when the lifting oil cylinder is located at different positions, and the pressure and flow output by the lifting valve are controlled. Two load-sensitive plunger pumps are used as power elements, and two relatively independent power sources are used for driving respectively; the output flow of the electric proportional load sensitive lifting valve converges at the position of the balance floating valve group and then is input into the lifting oil cylinder to control the lifting cylinder to act; the load-sensitive plunger pump and the electric proportional load-sensitive lifting valve are matched for use, so that on-demand matching of lifting pressure and flow is realized, and heat productivity is reduced.

    本申请提供了一种液压举升系统和工程机械,所述平衡浮动阀组与所述液压油箱的油路之间并列连接有驱动组件,所述举升油缸并联于所述平衡浮动阀组上;所述吸油过滤器、截止阀、柱塞泵、高压过滤器及举升阀依次连接于液压油箱和平衡浮动阀组之间;所述先导比例阀控制所述举升阀内的主阀芯两端压力,实现举升油缸在不同位置时的主阀芯开口量不同,控制举升阀输出的压力与流量。本发明采用2个负载敏感柱塞泵作为动力元件,2个相对独立的动力源分别驱动;电比例负载敏感举升阀的输出流量在平衡浮动阀组处合流后,输入举升油缸,控制举升缸动作;通过负载敏感柱塞泵与电比例负载敏感举升阀配合使用,实现了举升压力及流量的按需匹配,减小发热量。


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    Title :

    Hydraulic lifting system and engineering machinery


    Additional title:

    一种液压举升系统和工程机械


    Contributors:
    SONG KEJUN (author) / DENG HUI (author) / MIAO HENGXIN (author) / WANG LISHUANG (author) / LI PENGFEI (author)

    Publication date :

    2023-03-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein / B60P Fahrzeuge zum Transport von Lasten oder zum Befördern, Tragen oder Aufnehmen besonderer Lasten oder Gegenstände , VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS



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