Liebherr-International has patented a method to determine the number of rope reevings in a pulley block using sensors and a control unit. By comparing rope paths and height differences between blocks, the system automatically calculates the number of reevings during operation. GlobalData’s report on Liebherr-International gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Liebherr-International, was a key innovation area identified from patents. Liebherr-International's grant share as of May 2024 was 44%. Grant share is based on the ratio of number of grants to total number of patents.
Method for determining number of rope reevings in pulley block
A recently granted patent (Publication Number: US11999601B2) outlines a method for determining the number of rope reevings in a pulley block used in cranes. The method involves providing a pulley block with a top and bottom block and utilizing sensors to detect the rope path of different rope lines within a specified time window. This information is then compared by a control unit to determine the number of rope reevings in the pulley block automatically. The patent details various scenarios for measuring the rope path, including using rope pulleys, measuring rollers, and hoisting rope winches, with incremental revolution measurements playing a key role in the process.
Furthermore, the patent also describes a system and a crane incorporating this method for determining rope reevings. The system includes a measuring device with sensors and an evaluation unit, while the crane features a control unit communicating with sensors for rope path measurements. The control unit is programmed to compare the rope paths of different rope lines and changes in height between the top and bottom blocks to calculate the number of rope reevings. The patent emphasizes the automation of this process using sensors and control units, highlighting the efficiency and accuracy it brings to crane operations. Additionally, the crane control unit is equipped with a program application stored on a data carrier to facilitate the execution of the method, ensuring seamless integration and functionality within crane systems.
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