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Method for adapting the power of a hoisting winch

A winch and power technology, applied in the direction of the spring mechanism, electrical components, control system, etc., can solve the problems of insufficient power, influence of construction site progress, uncertainty, etc., and achieve the effect of increasing effective power

Inactive Publication Date: 2010-12-22
MANITOWOC CRANE GROUP FRANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As tower cranes are set up on work sites, especially building construction sites, the electrical grids that supply these sites may be temporary or temporary such that the power available for that grid is limited or uncertain, or there is no electricity grid and using a sufficiently powerful generator is very expensive
[0005] With such unsuitable and especially insufficient power, it is impossible to use lifting equipment as known today, which will have a significant impact on the progress of the construction site

Method used

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  • Method for adapting the power of a hoisting winch
  • Method for adapting the power of a hoisting winch
  • Method for adapting the power of a hoisting winch

Examples

Experimental program
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Embodiment Construction

[0024] figure 1 A tower crane is shown very schematically, comprising a boom 2 and a boom 3 along which a trolley (chariot) moves, under which a load 4 is lifted by means of a block of pulleys and a hook (not shown). Figure) is suspended on the sling 5.

[0025] The crane also comprises a hoisting winch 6 mainly comprising an electric motor, a reducer and a tambour around which the sling 5 is wound, the motor thus driving the drum in rotation by means of a reducer.

[0026] The electric motor of the winch 6 is controlled by a frequency converter 7 which acts as a speed converter. The frequency converter 7 itself is supplied with electrical energy by a power source 8, in particular a power distribution network. It is assumed here that the electrical power P and / or voltage V available for the electrical network for supplying the cranes involved is variable in order to adapt the power of the winch 6 to the available power taking into account the weight of the lifted load 4 pow...

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Abstract

The method is suitable for a hoisting winch (6), comprising a motor which is controlled by a power inverter (7). The power inverter (7) is powered by an electrical power supply network (8). The method allows that the power of the hoisting winch (6) adapts with that of the electrical power supply network (8). The method involves weighing a load (4) to be lifted and measuring voltage (V) of the electrical power supply network (8) during the initial lifting phase of the load. A power coefficient greater than one is defined if the measured voltage is greater than the nominal voltage adding with a certain value to increase the power of the hoisting winch (6). The method is especially suitable for the winch control of a tower crane.

Description

technical field [0001] The invention generally relates to lifting equipment, in particular tower cranes, equipped with a lifting winch. The invention relates more particularly to a method of power adaptation for hoisting winches on such installations. Background technique [0002] Tower cranes are equipped with a winch, which is driven by an electric motor, to lift the load. The electric motor of the winch is supplied with electrical energy by means of a distribution network or a self-contained generator. [0003] In recent years, the motors of the hoisting winches of tower cranes have been controlled by frequency converters for obtaining continuous variability of the winch speed, as described for example in European patent application EP1094594A1, and as also in French patent application FR2858490A1 or its counterpart Mentioned in EP1503493A2. Document EP0544084A2 also describes this prior art. [0004] The hoisting winches of tower cranes are becoming more and more pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/04
CPCB66C13/22B66D1/12
Inventor 丹尼斯·马特
Owner MANITOWOC CRANE GROUP FRANCE
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