JPH0468096U

JPH0468096U -

Info

Publication number: JPH0468096U
Application number: JP11128990U
Authority: JP
Priority date: 1990-10-23
Filing date: 1990-10-23
Publication date: 1992-06-16
Anticipated expiration: 2005-10-23
Also published as: JP2537748Y2

Description

[Brief explanation of the drawing]

第１図は、本考案の折り畳みブームを有する移
動式クレーンの安全装置の説明図、第２図は、折
り畳みブームを有する移動式クレーンの説明図、
第３図及び第４図は、従来の折り畳みブームを有
する移動式クレーンの安全装置の説明図である。１……走行車体、２……旋回台、３……第１ブ
ーム、４……起伏駆動装置、８……第２ブーム、
２０……ワイヤーロープ、２４……先端滑車、２
５……フツクブロツク、２６……負荷検出器、Ａ
……折り畳みブーム有する移動式クレーン、Ｂ…
…折り畳みブーム、Ｄ……ブーム稼働姿勢検出手
段、Ｆ……停止手段、Ｇ……演算手段。 FIG. 1 is an explanatory diagram of a safety device for a mobile crane with a folding boom according to the present invention, FIG. 2 is an explanatory diagram of a mobile crane with a folding boom,
3 and 4 are explanatory diagrams of a safety device for a conventional mobile crane having a folding boom. 1... Traveling vehicle body, 2... Swivel base, 3... First boom, 4... Lifting drive device, 8... Second boom,
20...Wire rope, 24...Tip pulley, 2
5... Hook block, 26... Load detector, A
...Mobile crane with folding boom, B...
...Folding boom, D...Boom operating attitude detection means, F...Stopping means, G...Calculation means.

Claims

[Claims for Utility Model Registration] A first boom, a base end of which is attached to the tip of the first boom so that it can be driven up and down, and a folded position where it is folded along the first boom and an extended position where it is extended. A folding boom is formed by a second boom that is driven to rise and fall between the folding booms, and a base end of the first boom of the folding boom is attached to a swivel platform on a traveling vehicle body so as to be able to be driven to rise and fall. A mobile crane having a folding boom formed by suspending a foot block via a wire rope via a pulley at the tip of the second boom, in particular, crane work in which a load is suspended from the foot block within a predetermined depression angle area of the second boom. A safety device for a mobile crane that has a folding boom that has an operating area in which loading is prohibited, including a load detector that detects the load acting on the hoisting drive device of the first boom, and an operating position of the folding boom. a boom operating attitude detecting means for detecting the boom operating attitude, which receives signals from the load detector and the boom operating attitude detecting means, and is capable of acting on the first boom hoisting drive device in the boom operating attitude at that time based on the signal from the boom operating attitude detecting means; a calculation means for calculating a load limit value, comparing the calculated limit value with a signal from the load detector, and outputting a stop signal when the latter value reaches the former value; stopping means for receiving the stop signal from the folding boom and stopping the operations related to the folding boom, wherein the calculating means is configured to detect the load when the operating position of the folding boom is in a load lifting prohibited operation range; The limit value with which the signals from the equipment are compared shall be configured to calculate a limit value that corresponds to a load that is slightly higher than the load acting on the hoisting drive device of the first boom based on the folding boom's own weight. A safety device for a mobile crane with a folding boom, characterized by: