Method and apparatus for detecting crack formation in lifting members and lifting frame

A technology for lifting frames and components, which is applied in the measurement, measurement of force, and tension measurement of the change force of the optical properties of the material when it is stressed, and can solve the problems of container falling off, too frequent, twist lock damage, etc., to achieve and The effect of compact equipment and reliable equipment

Inactive Publication Date: 2016-01-20
STINIS BEHEER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Twistlocks can eventually fail due to crack formation, whereby the remaining twistlocks are loaded more heavily, which itself can also lead to crack formation and damage
Because damage to one or more twistlocks could cause the container to fall off the spreader, which can have catastroph

Method used

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  • Method and apparatus for detecting crack formation in lifting members and lifting frame
  • Method and apparatus for detecting crack formation in lifting members and lifting frame
  • Method and apparatus for detecting crack formation in lifting members and lifting frame

Examples

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Example Embodiment

[0028] The lifting frame or spreader 1 used to transport the container 2 is suspended from the container crane by a cable 5 pulled around a pulley 4. The lifting frame 1 includes a central beam 6, two extendable middle beams 7 and two extendable outer beams 8. Each outer beam 8 supports a cross beam 9 that defines two corner points 12. Lifting members or twist locks 11 engaged in the openings 20 in the corner castings 21 of the container 2 are provided at these corner points 12 of the lifting frame 1. A pivotable guide member or flipper 13 is also provided at the corner point 12.

[0029] Each lifting member 11 is substantially T-shaped and has a shaft 14 and a hammer head 15. Two grooves and thus two collars or shoulders 16, 17 are formed on the upper side of the shaft 14, so that the lifting member 11 is suspended on the same with two grooves and two collars 18, 19 Annular support element. These two collars form a redundant path of force as described in EP1385772B1. The ro...

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PUM

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Abstract

The present invention relates to a method for detecting crack formation in a lifting member, comprising the steps of measuring the stress under load at two points of the lifting member, comparing the measured stresses, and when the measured stresses differ too much from each other A warning signal is generated frequently. The invention also relates to a device for detecting crack formation in a lifting member, comprising: means arranged at two points of the lifting member for measuring the stress under load; connected to the measuring means for comparing the measured means for stress; and means connected to the comparison means for generating a warning signal when the measured stresses differ too much from each other. Finally, the invention relates to a lifting frame comprising: a plurality of lifting members mounted on the lifting frame close to the corners of the lifting frame; and a crack detection device connected to the lifting members.

Description

technical field [0001] The present invention relates to a method for detecting crack formation in lifting members such as like twistlocks. Such twist locks are used on a large scale for attaching containers. Background technique [0002] A container is usually provided at its eight corner points with so-called corner castings in which are formed openings adapted to form the heads of the twistlocks. When a container has to be transferred from a ship to a quay or vice versa, eg by means of a crane, a lifting frame (so-called spreader) suspended from the crane by means of hoisting ropes is lowered to a position directly above the container. The spreader is provided with twistlocks at its four corners which are then set into the corner castings by carefully manipulating the spreader and then turning the twistlocks a quarter turn so that the head of each twistlock Locked into corner castings. Then the spreader and the container on it are hoisted by the traction of the hoisting...

Claims

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Application Information

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IPC IPC(8): G01L5/10G01M11/08G01M5/00G01L1/24
CPCG01L1/246G01L5/101G01L5/105G01M5/0041G01M11/086G01L5/10G01M5/00G01L1/24G01M11/08G08B21/182
Inventor 科内利斯·斯蒂尼斯
Owner STINIS BEHEER
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