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Method and device for adjusting the load of a luffing jib tower crane

A tower crane, crane technology, applied in cranes, measuring devices, transportation and packaging, etc., can solve problems such as matching specific problems

Inactive Publication Date: 2010-05-12
MANITOWOC CRANE GROUP FRANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it does not fit with the specific issues above specifically for luffing jib tower cranes

Method used

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  • Method and device for adjusting the load of a luffing jib tower crane
  • Method and device for adjusting the load of a luffing jib tower crane
  • Method and device for adjusting the load of a luffing jib tower crane

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Embodiment Construction

[0035] In a preferred embodiment of a method which is a subject of the present invention, the above-mentioned further load curve used between the intermediate amplitude and the maximum amplitude is by a similar transformation of the above-mentioned first load curve used between the minimum amplitude and the intermediate amplitude (homothetic transformation) obtained by the curve.

[0036] Thus, in principle, the invention consists in establishing a load curve C (see Figure 4 ), whose theoretical torque is greater than that of the above-mentioned load curve B, and in particular obtained from curve B by similar transformation, and the two curves B and C are used in turn. More specifically, the variation of the load curve is determined by the diagram and is realized at the intersection of curve C and curve A so as not to put the crane at risk: curve B is used between the minimum amplitude Pm and the intermediate amplitude PO, curve C is used between the middle amplitude PO and ...

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PUM

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Abstract

The adjust of the load is realized through the specified load picture combining with the measured force suffered by the balance arm tie of the crane. The method involves alternatively using two separated load curves depending on the radius (P) of a luffing jib tower crane as a result of the position of a jib of the crane. The first load curve (B) is used between the minimum radius (Pm) and an intermediate radius (PO). Another load curve (C) is used between the intermediate radius and the maximum radius (PM) corresponding to a greater load moment. The curve (C) is obtained by homothetic transformation of the curve (B). An independent claim is also included for a device for controlling the load of a luffing jib tower crane.

Description

technical field [0001] The present invention relates generally to luffing jib tower cranes. More particularly, the present invention relates to a method for adjusting the load of a luffing jib tower crane and to a device for implementing such a method. Background technique [0002] in the attached picture figure 1 A luffing jib tower crane is shown diagrammatically. Such a crane comprises, at the top of a mast represented by its vertical axis z, a device rotating around this z-axis, which device comprises a swinging jib (luffing jib) 2, a counter-arm carrying a counterweight 4 ( counter jib) 3, strut 5 and balance arm tie bar (tie bar) 6. The fixed length of the counter jib 3 is denoted by d, while the radius of the crane depending on the inclination α of the jib 2 is denoted by P. [0003] In order to function, this luffing jib crane needs to work with a load Figure 1 In use, that is to say, the maximum lifting load is associated with the respective angle of inclinati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66C23/16B66C13/16G01L5/00
CPCB66C23/905
Inventor 米歇尔·利桑德尔让-皮埃尔·苟铁
Owner MANITOWOC CRANE GROUP FRANCE