The Kasto Unitop tower storage system at steel stockholder Heine + Beisswenger's Langenzenn site
Since 1995, an automated storage tower manufactured by Kasto
in Achern, southern Germany, has been installed at stockholder Heine + Beisswenger
, underpinning fast, punctual delivery of an extensive range of steels to customers.
However, 25 years of constant operation had impacted performance and availability, so Kasto recently updated the Unitop storage system with a comprehensive retrofit.
Kasto is represented in the UK and Ireland by its subsidiary, Kasto UK
, in Milton Keynes.
Heine + Beisswenger is one of the largest family-run steel and metal stockholders in Germany and over the years, has developed into an international group with 14 sites and almost 600 employees. The product range encompasses carbon and engineering steels, unalloyed steels, stainless steel, rolled steel and non-ferrous metals – a total of more than 25,000 stock items in various grades, profiles and dimensions.
With an inventory of around 55,000 tonnes of material and a sophisticated logistics system, Heine + Beisswenger ensures that orders reach the customer in the shortest possible time.
Headquartered in Fellbach, the company opened a centre in Langenzenn in 1995, which from the outset has used the Kasto Unitop automatic cassette system for warehousing an extensive variety of materials. Measuring 68m long x 13m wide, the facility has space for 1,300 cassettes, each of which can hold four tonnes of material up to 7m long.
A feature of the system is the storage and retrieval machine (SRM), located at the top of the storage block. It automatically removes a cassette containing the required material and transfers it to a carriage, which then makes the stock available at ground level at one of two storage and retrieval stations.
Each has four locations, so the operator can store and retrieve several cassettes at the same time.
The system was showing signs of age, however. The control and automation technology was no longer up-to-date and the drives and positioning mechanisms of the SRM were unreliable.
Breakdowns were becoming more frequent and procuring spare parts was increasingly difficult. In terms of throughput, the storage facility was struggling to cope due to the increasing number of orders being received. Full retrofit
Torsten Meincke, plant manager at the Langenzenn centre, said: “Mechanically, the system was still performing well. It is also ideally integrated into our processes and our employees are familiar with it, so we decided not to replace the system completely, but to modernise it with a full retrofit.”
Gerd Jakob, retrofit project manager at Kasto said: “In many cases, modernisation is much more economical than a new purchase. After all, large parts of our storage systems such as the steel construction are almost indestructible, so these components can continue to be used.”
During the retrofit at Heine + Beisswenger, Kasto replaced the existing S5 system control with a modern Siemens Simatic S7 400 PLC and updated the drive controllers as well as the SRM’s positioning sensors and Profinet connection.
Meanwhile, the hoisting gear was given an efficient, three-phase drive and the power supply to the SRM and carriage was renewed to improve reliability.
The carriage that receives the cassettes and delivers them to the storage and retrieval stations at the front of the Unitop was also replaced. The carriage now has two roller conveyors instead of one to allow simultaneous handling of two cassettes.
Additionally, the longitudinal travel speed of the new carriage is twice as fast at 120m per min, increasing efficiency further. According to Meincke, 35sec is saved per storage and retrieval cycle.
The control panels serving the two storage and retrieval stations were renewed and Kasto also replaced the old hard-wired emergency operation of the SRM with a modern radio remote control.
Mr Meincke added: “This makes maintenance work and eliminating malfunctions much easier because a technician no longer has to stay next to the SRM to operate it.”
The storage facility is now controlled and managed by KASTOlogic warehouse management software, which has a graphical user interface that makes operation simple and intuitive. It is connected to the SAP ERP system in used at Heine + Beisswenger.
Mr Meincke concluded: “This gives us a uniform process from ordering through to delivery to the customer and also helps us to ensure a high level of inventory transparency.”
The conversion was completed in just two weeks, with Kasto engineers even working in the facility at weekends and over the Easter holiday to minimise disruption to the stockholder's day-to-day business.
The operators were then given in-depth training to familiarise them with the new system and since then, the warehouse has been operating reliably at its increased efficiency level. Kasto is available for troubleshooting and on-line remote maintenance via its service hotline.