| Abstrakt: |
This paper demonstrates the low life expectancy of the steel wire rope that might be achieved by using the ISO 4308-Part1:2003 for the calculation of the reeving system of a S/R machine. The problem is illustrated with a case study: Calculation of one S/R machine steel wire rope service life. It is also shown that the application of the DIN 15020-Part1:1974, leads to better results on the steel wire rope service life. In response to increasingly demanding customer requirements for high throughput automatic storage systems, S/R machines and VTDs are being pushed to achieve higher number of cycles per hour. The S/R machines are under the scope of EN 528:2008, which states that the ISO 4308-Part1:2003 must be used to calculate and design the steel wire rope reeving system. This standard has been developed for cranes and it takes in account the lifting appliance mode of operation, through the mechanism classification group. However, even the consideration of the most demanding mechanism classification for the steel wire rope calculations may lead to a low service life of the rope. As stated previously, in this paper a S/R machine case study calculation of a steel wire rope service life is made. The lifting system is designed according to the ISO 4308-Part1:2003 and DIN 15020-Part1:1974, and the service life is calculated and compared with the typical requirements for an automatic storage and retrieval warehouse system. Methods like the one developed by Feyrer, may support the machine designer to increase the steel wire rope life expectancy. This method allows the assessment of the impact on the steel wire rope service life of one given improvement in the reeving system design, enabling the designer to balance improvement with cost. [ABSTRACT FROM AUTHOR] |
Full text from SpringerLink