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Automatic boom extension/contraction device for work machine

一种自动伸缩装置、作业机械的技术，应用在卷扬装置、起重机、运输和包装等方向，能够解决长的时间伸缩动作等问题，达到减轻疲劳等负担的效果

Active Publication Date: 2017-02-22
TADANO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the above-mentioned boom is extended from a completely shortened state to a fully extended state, for example, when the amount of expansion and contraction becomes large, it takes a long time to perform the telescopic operation.

Method used

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  • Automatic boom extension/contraction device for work machine
  • Automatic boom extension/contraction device for work machine
  • Automatic boom extension/contraction device for work machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] Figure 1 to Figure 6 It is a figure which shows one embodiment of this invention. In this embodiment, the crane apparatus provided with the boom automatic extension device of this invention is shown using the mobile crane 1. FIG.

[0022] Such as figure 1 As shown, the mobile crane 1 includes a vehicle 10 and a lifting device 20 .

[0023] The vehicle 10 has wheels 11 and travels with an unillustrated generator as a power source. In addition, outriggers 12 are provided on the left and right sides of the front and rear sides of the vehicle 10 , which prevent the vehicle 10 from being turned upside down during crane operation, and at the same time support the vehicle 10 stably. The supporting legs 12 can move to the outside in the width direction, and can also be extended downwards through the hydraulic jack cylinder. The legs 12 can stably support the vehicle 10 with respect to the ground by grounding their lower ends.

[0024] The crane device 20 includes a turnta...

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PUM

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Abstract

Provided is an automatic boom extension / contraction device for a work machine in which it is possible to reduce the burden, such as arm or hand fatigue, on a worker inputting an operation for extending or contracting a boom when the worker actuates the boom so as to extend or contact. When, in a state in which an automatic extension / contraction switch (53) is ON, an engine rotation speed equal to or greater than a first predetermined rotation speed (R1) is detected by an engine rotation speed sensor (51) and an operation in which the speed of extension / contraction actuation of a boom (22) is equal to or greater than a predetermined speed is inputted through a boom extension / contraction lever (52), an automatic extension / contraction actuation is performed in which the extension / contraction actuation of the boom (22) is maintained in a state in which an operation of extending / contacting the boom (22) is not inputted through the boom extension / contraction lever (52).

Description

technical field [0001] The present invention relates to an automatic arm telescopic device of a work machine, which is provided with a boom that performs a telescoping operation. Background technique [0002] As a conventional work machine, for example, a mobile crane or the like is known to be provided with a boom that performs a telescoping operation. This boom has a plurality of boom members, and telescopic operation is performed by moving the boom members adjacent to the distal end relative to the boom members other than the most distal boom member (for example, refer to Patent Document 1). [0003] In addition, the above-mentioned boom is extended and retracted under the drive of a telescopic air cylinder provided inside the boom member. Therefore, in the case where the amount of expansion and contraction becomes large, for example, from the fully shortened state to the fully extended state, the above-mentioned boom takes a long time to perform the expansion and contra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66C23/693
CPCB66C13/20B66C23/705B66C23/708B66C13/18B66C23/42B66C23/54B66C23/701
Inventor 池田智彦佐藤岳人
Owner TADANO LTD
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