JPH0484767U

JPH0484767U -

Info

Publication number: JPH0484767U
Application number: JP12848590U
Authority: JP
Priority date: 1990-11-30
Filing date: 1990-11-30
Publication date: 1992-07-23

Description

[Brief explanation of the drawing]

第１図は本考案の第１実施例に係わるコンクリ
ートポンプの緊急操作装置を示す電気回路図、第
２図は本考案の第２実施例に係わるコンクリート
ポンプの緊急操作装置を示す電気回路図、第３図
は従来におけるコンクリートポンプの油圧回路図
、第４図は同コンクリートポンプの電気回路図で
ある。主要な部分の符号の説明、１……ホツパ、２，
３……コンクリート移送用シリンダ、２ａ，３ａ
……ピストン、７，８……油圧シリンダ、７ｂ，
８ｂ……一端側作動室、９……第１管路、１０…
…第２管路、１１……電磁方向制御弁、１２ａ，
１２ｂ……ソレノイド、２５Ａ，２６Ａ……入力
端子、２５Ｂ，２６Ｂ……出力端子、２７……非
常用手動スイツチ、２８……スイツチ用入力端子
、２９，３０……スイツチ用出力端子、ＬＳ_１，
ＬＳ_２……リミツトスイツチ。 FIG. 1 is an electric circuit diagram showing an emergency operation device for a concrete pump according to a first embodiment of the present invention, and FIG. 2 is an electric circuit diagram showing an emergency operation device for a concrete pump according to a second embodiment of the present invention. FIG. 3 is a hydraulic circuit diagram of a conventional concrete pump, and FIG. 4 is an electric circuit diagram of the same concrete pump. Explanation of the symbols of the main parts, 1...hoppa, 2,
3... Concrete transfer cylinder, 2a, 3a
... Piston, 7, 8 ... Hydraulic cylinder, 7b,
8b... One end side working chamber, 9... First pipe line, 10...
...Second pipe line, 11...Solenoid directional control valve, 12a,
12b... Solenoid, 25A, 26A... Input terminal, 25B, 26B... Output terminal, 27... Emergency manual switch, 28... Input terminal for switch, 29, 30... Output terminal for switch, LS ₁ ,
LS ₂ ...Limit switch.

Claims

[Scope of Claim for Utility Model Registration] (1) A pair of hydraulic cylinders for advancing and retracting pistons in a pair of concrete transfer cylinders for suctioning and discharging fresh concrete in a hopper, and one end of the pair of hydraulic cylinders. The main directional control valves are connected to the side working chambers through conduits, a pair of limit switches each detecting the forward or backward state of each piston, and each input terminal of the pair of limit switches is connected to the same potential. , an electric circuit that demagnetizes and energizes a pair of solenoids of a main directional control valve by opening and closing operations of a pair of limit switches;
An emergency manual switch is connected in parallel, and the emergency manual switch is connected to a switch input terminal connected to each input terminal of the pair of limit switches, and a switch input terminal that is always OFF to the input terminal of the pair of limit switches. A pair of switch output terminals are connected to each output terminal of the switch, and the switch input terminal can be selectively connected to one of the pair of switch output terminals. Concrete pump emergency operation device. (2) A pair of hydraulic cylinders that advance and retreat the pistons in a pair of concrete transfer cylinders for sucking and discharging ready-mixed concrete into the hopper, and a pipeline at one end of the working chamber of the pair of hydraulic cylinders. A main directional control valve is connected to the main directional control valve, a pair of limit switches each detecting the forward or backward state of each piston, and each input terminal of the pair of limit switches is connected to the same potential, and the opening/closing operation of the pair of limit switches In a concrete pump equipped with an electric circuit for demagnetizing and energizing a pair of solenoids of a main directional control valve, a shutoff switch that is selectively turned on and off and is always on is connected in series to the input terminals of the pair of limit switches. , an emergency manual switch is connected in parallel from the input terminal of the cutoff switch to the output terminal of the pair of limit switches, and the emergency manual switch is connected to a switch input terminal connected to the input side of the cutoff switch. and a pair of switch output terminals that are always turned off with respect to the switch input terminal and connected to each output terminal of the pair of limit switches, and the switch input terminal and one of the pair of switch output terminals are connected to each output terminal of the pair of limit switches. An emergency operation device for a concrete pump, characterized in that it can be selectively connected to a concrete pump.