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Mobile crane

A technology of mobile cranes and jibs, which is applied to cranes and other directions, can solve problems such as low operating efficiency, damage, and movement obstruction of spreaders, and achieve the effects of cost reduction and favorable operating capabilities

Inactive Publication Date: 2009-10-14
KOBELCO CONSTR MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hereinafter referred to as obstacles) interference, not only the movement of the extender is hindered, but also the danger of causing damage to each other
[0012] On the other hand, according to the suspension method that floats the upper spreader in the air, although this interference can be avoided, since the upper spreader weighing more than 300 kg is floated and moved, it is required to carefully operate the hoist, Therefore, its operating efficiency is lower than that of the horizontal movement method

Method used

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  • Mobile crane
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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0051] The first embodiment (refer to Figure 1 to Figure 9 )

[0052] figure 1 shows the state (assembled state) during the lifting operation of the mobile crane of the present invention, Figure 2 to Figure 7 The assembly and disassembly processes of the crane are shown in .

[0053] In each drawing, 1 is a crawler-type lower traveling body, 2 is a revolving upper body rotatably mounted on the lower traveling body 1 , and these constitute a base machine A. A boom (called a "tower" in some types) 3 is attached to the swiveling upper body 2 so as to be able to pitch freely via a boom bottom pin 4 serving as a pitch fulcrum. A boom 5 is attached to the tip of the boom 3 so as to be able to pitch freely.

[0054] Moreover, some cranes perform lifting work by pitching both the boom 3 and the boom 6, and the present invention also includes such mobile cranes.

[0055] Basically, the boom 5 is pitched while the boom 3 is held at a constant angle (in a luffing crane, the boom 3...

no. 2 Embodiment approach

[0099] The second embodiment (refer to Figure 10 )

[0100] In the first embodiment, a configuration is adopted in which movement is restricted only in the direction in which the tension of the boom elevating cable 7 increases. Conversely, if the cable tension is too low, the cable will be tangled, so it is desirable to limit the movement in the direction in which the cable tension decreases.

[0101] pass Figure 10 The control content of the second embodiment capable of realizing these two functions will be described.

[0102] In step S11, it is judged whether it is being assembled / disassembled, and in step S12, it is judged whether the boom angle is an angle at the time of assembly / disassembled. Then, in step S13, based on the Figure 8 Whether the signals of the pressure sensors 32, 33 of the boom are simultaneously unwound and hooked up are used to determine whether the two operations of the boom lifting cable are unwound and the hook-up cable is rewound. Thereafter...

no. 3 Embodiment approach

[0115] 3rd embodiment (refer to Figure 11 ~ Figure 15A , Figure 15B )

[0116] use Figure 11 to Figure 14 The upper spreader 9' having a configuration different from that of the above-mentioned embodiment and a configuration for moving it between a position on the base end side of the boom and a position on the front end side will be described. On the other hand, for the parts that are common to the above-mentioned embodiments, while referring to the aforementioned appended Figure 1 side to explain.

[0117] A pair of left and right guide rails 190 , 190 as support leg guide members are provided on the boom upper surface so as to span a certain section from the base end side to the front end side of the boom 3 .

[0118] These two guide rails 190 and 190 are formed in a closed cross-sectional shape having a horizontal upper surface like a square steel pipe or the like.

[0119]On the other hand, the upper spreader 9' is formed by integrating the vertical pulley block ...

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Abstract

The mobile crane according to the present invention is equipped with a hook-up guide pulley for guiding the hook-up cable from the top of the boom to the front end side of the boom. The guide pulley is provided on the top of the boom in the following state: When the crane is assembled and disassembled, the hook-up cable can be guided back along the upper surface of the boom to the upper spreader placed on the base end side of the boom. Accordingly, the upper spreader can be moved between the base end side and the front end side of the boom without providing a dedicated guide pulley for moving the upper spreader. In addition, a pair of left and right supporting feet are set downward on the front and rear sides of the upper spreader, and rollers are arranged on each supporting foot, so that a horizontal movement method with high working efficiency can be obtained, and the upper part can be prevented from being stretched when moving. Interference with obstacles on the side of the machine and the upper surface of the boom.

Description

[0001] This application is a divisional application of the Chinese patent application 200510003812.2 with the filing date of January 10, 2005, entitled "Mobile Crane and Its Assembly and Disassembly Method". technical field [0002] The present invention relates to a mobile crane in which a suspender is freely pitchable at the front end of a boom and an assembly method thereof. Background technique [0003] If the mobile crane is large, the main body of the machine, the boom, the boom as attachments, and the components of the pitching device constituting these parts are divided and transported to the work site, where they are then assembled. [0004] In the lower and upper spreaders on which the boom lifting cables are wound, it is necessary to pull out the upper spreaders, and it is necessary to bring them back when they are disassembled. However, due to the heavy weight of the upper spreaders, it is very difficult to move them manually Therefore, the winding force of the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66C23/36B66C23/62B66C23/70
Inventor 藤堂治下村耕一福本圭介
Owner KOBELCO CONSTR MASCH CO LTD