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f+h Intralogistics 4/2014

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f+h Intralogistics 4/2014

Cranes and hoists Demag

Cranes and hoists Demag cranes for two paper-roll shipping stores in Thailand The Terex Material Handling joint venture MHE-Demag has been awarded a contract by Siam Kraft Industry Co. Ltd. for the delivery of five fully automated Demag process cranes. The cranes will be used in two paper-roll shipping stores in the Ratchaburi province. An automated paper-roll shipping store that is equipped with three cranes accommodates the entire output of the newly installed PM16 paper machine; a further shipping store provides space for the production output of the PM1 and PM3 paper machines. In both paper-roll shipping stores, Demag process cranes equipped with mechanical roll grippers provide for fast and, above all, gentle storage of the paper rolls. The crane installations can lift up to four rolls at the same time (see Image), thus achieving handling rates of 120 rolls per hour in the paper-roll shipping store for the PM16 and 80 rolls in the paper-roll shipping store for the PM1 and PM3 paper machines. The scope of delivery also includes the installation of a Demag warehouse management system at both locations to manage the stores and control the crane systems. Both stores are scheduled to be commissioned at the beginning of 2015. These installations are the result of Terex Material Handling’s international project engineering and manufacturing network. Close co-operation between MHE-Demag in Thailand, responsible for providing customers with support and advice, and the engineering departments at Terex Material Handling in Germany, result in paper-roll shipping stores that are precisely tailored to meet the customers’ specific needs. This also applies to manufacturing: in addition to the process crane components and the mechanical paper-roll grippers, Terex Material Handling also supplied the warehouse management system. The steel structure for the crane girders and crane rails is manufactured locally by MHE-Demag. The MHE-Demag service network assembles and installs the crane systems and also maintains the installation. “The investment in two new paper-roll shipping stores is a key element of our growth strategy”, explains Chartchai Leukulwatanachai, Managing Director of Siam Kraft Industry, “for these projects, we rely on MHE-Demag, a company with regional expertise and an international technology network. We also opted for Demag process crane engineering as a result of a large number of first-class references.” Lutz Dowy, Vice President Global Product Management & Process Cranes at Terex Material Handling, adds “the equipment installed at the two paper-roll shipping stores marks the first fully automated Demag crane systems in Thailand. The installations play a major role in boosting the storage capacity and handling volume at the locations operated by Siam Kraft Industry.” Two shipping stores for three paper machines Siam Kraft Industry Co., Ltd. is a subsidiary of SCG Paper. With a production capacity of 1.7 million tons per year at twelve production facilities in Thailand, the Philippines and Vietnam, SCG Paper is one of the largest manufacturers of paper in Asia. The newly installed PM16 paper machine has an annual production capacity of 320,000 t of recycled, corrugated base paper weighing between 105 and 150 g/m². To ensure that the production output is carefully stored and retrieved just-in-time, Siam Kraft Industry is investing in a new paper-roll shipping store for which MHE-Demag is 38 f+h Intralogistics 4/2014

Cranes and hoists Up to four rolls in one lift: Process crane with mechanical gripper About Terex Material Handling Terex MHPS GmbH is one of the world’s leading suppliers of crane technology with Demag industrial cranes and crane components. The core competence of the Terex Material Handling business group lies in the development, design and production of technically sophisticated cranes, hoists and components and the provision of services for these products. The business group manufactures in 15 countries on five continents and is present in more than 60 countries, reaching customers in more than 100 countries. supplying three process cranes. A new shipping store for the PM1 and PM3 paper machines featuring two identical Demag process cranes will subsequently be installed in the Ban Pong facilities. When the new PM16 paper machine achieves its full production capacity at the Ratchaburi Mill, up to 1,050 t of paper will have to be accommodated in the paper-roll store every day. The rolls, which are configured to meet individual customer specifications, measure between 620 and 2,520 mm in width and weigh between 400 and 2,400 kg. The store for the PM16 covers a total area of more than 3,300 m² and can accommodate some 10,500 t of paper when filled to a capacity of 80 %. The store is operated around the clock in 24/7 operation, in two shifts. During periods in which no loading operations are performed, the cranes optimise the store with regard to subsequent retrieval operations. The shipping store is divided up into two areas in which the paper rolls can be placed in stacks up to a height of 13.5 m, depending on their relevant diameter. Three identical ZKKW double-girder overhead travelling cranes, with a load capacity of 2.8 t and a range of 35.5 m, operate on crane rails with a total length of 90 m. The cranes handle unwrapped rolls with a maximum diameter of 3,600 mm and weight up to 2,880 kg. Siam Kraft Industry focused on a high level of dynamics when planning the store: up to 120 rolls can be handled per hour. In addition to a consistent storage concept, the high handling speeds specified by the paper manufacturer require the crane systems to deliver high performance outputs. The variable-speed drives can travel along and across the rails and reach speeds of up to 120 and 100 m/min, respectively. The system achieves lifting speeds of up 57 m/min, depending on the load. In addition to the high operating speeds, the crane control system employs dynamically overlapping travel motions to ensure that the three cranes, which operate on set of rails, achieve the necessary, high handling rates. Safe and reliable handling: fours rolls of paper in one lift The high handling rates are also achieved by the use of mechanical roll grippers. The mechanical gripper can lift up to four paper rolls measuring up to 900 mm in width at the same time. To do this, the process crane is precisely positioned above the centre of the roll by the warehouse management computer. Six arms engage the rolls with a constant contact pressure. Additionally integrated safety circuits – such as the redundantly designed sensors installed in the gripper – provide for safe and reliable handling in the automated storage processes. Thanks to the compact design of the mechanical roll gripper, the rolls of paper can be placed in a tight storage pattern. This enables the best possible utilisation of the available space to be achieved with minimum gaps of only 150 mm in the store layout. This generation of mechanical grippers has already proven to be a success in automated paper-roll stores in Europe and China for many years. About MHE-Demag Identical store concept for PM1 and PM3 The same store concept was also adopted to a common roll store for the PM1 and PM3 paper machine. The rolls in this store, which are configured to meet individual customer specifications, measure between 620 and 2,520 mm in width and weigh between 360 and 3,300 kg. The store covers a total area of more than 2,800 m² and can accommodate some 8,650 t of paper when filled to a capacity of 80 %. The rolls are stored around the clock according to the production output of the paper machines; there is a handling window of 12 to 20 hours per day for retrieval. Two identical ZKKW double-girder overhead travelling cranes, which have a load capacity of 3.3 t and a range of 35.5 m, operate on crane rails that measure 76 m in length. These cranes are also equipped with mechanical grippers to pick up wrapped and unwrapped rolls of paper and store them in stacks up to a height of 13.5 m. The two cranes handle up to 80 rolls per hour. Photos: Terex MHPS www.demagcranes.com MHE-Demag, a 50:50 joint venture owned by Terex Material Handling and Jebsen & Jessen (SEA) Pte Ltd., was established in Asia in 1972. MHE-Demag operates a closely knit, regional network within Singapore (headquarters), Malaysia, Thailand, Indonesia, Philippines, Vietnam and Taiwan, supported by eight manufacturing facilities and 40 companies and sales offices. The company offers a comprehensive range of Demag cranes, crane components, hoists and industrial drives on its markets. The company also supplies a wide variety of materials handling equipment, such as industrial trucks, dock levelers, gondola systems and automated car parking systems. f+h Intralogistics 4/2014 39

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