PROBLEM TO BE SOLVED: To provide a control circuit of an electric hydraulic type grab bucket, driven by a variable type hydraulic pump, and capable of adopting the grab bucket controlled for opening-closing by a pressure switch, without adding a new signal conductor.SOLUTION: A control circuit 14 of an electric hydraulic type grab bucket comprises a first circuit 14a provided in the grab bucket 1 and a second circuit 14b provided in an operation part M. The first circuit 14a comprises a signal output circuit 13 for outputting a detection signal D, while the oil temperature of a hydraulic fluid of the grab bucket 1 exceeds a predetermined temperature value or while delivery pressure of a hydraulic pump 9 for driving the grab bucket 1 exceeds a predetermined pressure value. A part between the signal output circuit 13 and the second circuit 14b is connected by one signal conductor.SELECTED DRAWING: Figure 3

    【課題】可変式の油圧ポンプで駆動され、圧力スイッチにより開閉制御されるグラブバケットを、新たな信号線を追加することなく採用できる電動油圧式グラブバケットの制御回路を提供する。【解決手段】電動油圧式グラブバケットの制御回路14は、グラブバケット1に設けられた第1回路14aと、操作部Mに設けられた第2回路14bとを備える。第1回路14aは、グラブバケット1の作動油の油温が所定の温度値を超えている間、又はグラブバケット1を駆動する油圧ポンプ9の吐出圧力が所定の圧力値を超えている間、検出信号Dを出力する信号出力回路13を備える。信号出力回路13と第2回路14bとの間は1つの信号線で接続される。【選択図】図3


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    Title :

    CONTROL CIRCUIT OF ELECTRIC HYDRAULIC TYPE GRAB BUCKET


    Additional title:

    電動油圧式グラブバケットの制御回路


    Contributors:

    Publication date :

    2016-05-16


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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