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Telescopic boom extension device

A telescopic device and telescopic arm technology, applied in the field of telescopic devices, can solve the problems of time-consuming repair, increased manufacturing cost, and complex circuits.

Active Publication Date: 2016-08-31
TADANO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, since the circuit for accumulating the accumulator with the pressure generated by the operating hydraulic cylinder is formed in a restricted space around the cylinder hose, it is not easy to maintain
Furthermore, since the circuit becomes complicated, there are problems such as an increase in manufacturing cost and a time-consuming repair in the event of a failure.

Method used

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  • Telescopic boom extension device
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Embodiment Construction

[0047] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0048] Hereinafter, preferred embodiments of the present invention will be described with reference to appropriate drawings. In addition, this embodiment is only one aspect of the telescopic device of the telescopic arm concerning this invention, It goes without saying that embodiment can be changed in the range which does not change the summary of this invention.

[0049]

[0050] figure 1 An enlarged view of a main part of a mobile crane (typically a crane for uneven terrain) employing the telescopic arm telescopic de...

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Abstract

The object of the invention is to improve a telescopic device of a telescopic arm disposed on a movable crane, namely a telescopic device capable of realizing successful driving of a B pin and a C pin, and having advantages of low costs and easy maintenance. A telescopic boom extension device (10) includes a driving mechanism. The driving mechanism that drives B pins (26-30) and a C pin (34) includes a hydraulic supply part (18) and a drive source generation part (19). The drive source generation part generates a predetermined hydraulic pressure at the hydraulic supply part based on a pneumatic pressure. The hydraulic supply part has an accumulator and AOHs and supplies a hydraulic pressure to a cylinder-boom coupling mechanism (15) and an inter-boom fixing mechanism (16). The drive source generation part uses a pneumatic supply part (41) to send compressed air to the hydraulic supply part.

Description

technical field [0001] The present invention relates to a device for extending and contracting a telescopic arm mounted on a mobile crane. Background technique [0002] For example, mobile cranes such as rough-terrain cranes generally have a multi-stage telescopic arm, and the telescopic movement of the telescopic arm is generally implemented by a hydraulic cylinder. In particular, conventionally, there has been proposed a device (hereinafter referred to as "telescopic device") that expands and contracts a telescopic arm with a single multi-action hydraulic cylinder (for example, refer to Patent Document 1 to Patent Document 3). [0003] The structure of the telescopic device is as follows. [0004] In the multi-stage telescopic boom, the lowermost and uppermost arms constituting the telescopic boom are respectively the base arm and the front end arm, and one or more arms arranged between them are the intermediate arms. In the case that the telescopic arm has a plurality o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66C23/687B66C23/68
CPCB66C23/705B66C23/22B66C23/68
Inventor 川渊直人川野贵史
Owner TADANO LTD
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