PROBLEM TO BE SOLVED: To provide an inexpensive dump truck hoist device with a more simple structure.SOLUTION: A three-position switching valve is used as a main control valve 35 for controlling a hoist cylinder 4. A control valve 49 for supplying working fluid from a low pressure oil pressure source to a rod chamber 4b of the hoist cylinder 4, during lowering of a vessel, is provided. A check valve 13 for supplying the working fluid from an oil tank 21 to the rod chamber 4b during float operation of the vessel, is provided between the rod chamber 4b of the hoist cylinder 4 and the oil tank 21. A controller 54 switches a position of the main control valve 35 to a float position when an operation command of an operation device is a command of lowering of the vessel, switches the control valve 49 for lowering the vessel for supplying the working fluid with low pressure discharged from the low pressure oil pressure source to the rod chamber 4b of the hoist cylinder 4.

    【課題】従来よりも簡単な構成で安価なダンプトラックのホイスト装置を提供する。【解決手段】ホイストシリンダ4を制御する主制御弁35として1つの3位置切換弁を用いる。ベッセル下げの際の低圧油圧源からホイストシリンダ4のロッド室4bに供給するための制御弁49を設ける。ホイストシリンダ4のロッド室4bと油タンク21との間に、ベッセル浮き動作の際に油タンク21から作動油をロッド室4bに供給可能とする逆止弁13を備える。コントローラ54は、操作装置の動作指令がベッセル下げ指令である際に、主制御弁35を浮き位置に切換え、かつベッセル下げ動作用の制御弁49を切換えて低圧油圧源からの低圧の作動油をホイストシリンダ4のロッド室4bに供給する。【選択図】図4


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    Title :

    DUMP TRUCK HOIST DEVICE


    Additional title:

    ダンプトラックのホイスト装置


    Contributors:

    Publication date :

    2015-11-02


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    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 / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein



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