PROCESS CRANES | TECHNOLOGY REPORT
on the mechanical components, as speed adjustments are made pre-emptively. The industrial drive solutions by Demag
featuring ZBA motors and travel wheels ensure the process cranes travel with exceptional smoothness that is gentle on the runways. Crane and travelling hoist positioning is continuously monitored by a long and cross-travel position measuring system, and data is transmitted to the bunker management system. For retrieval, the crane picks the cocoa beans up with its large-volume grab and transports them to an output hopper. This is designed to prevent unnecessary dust. The cranes also utilise a multi-step opening method to raise less dust when they feed the hoppers. In addition, this method also ensures that the valuable and sensitive product is deposited very gently. The cocoa beans are transported to the loading points for trucks or barges via conveyor belts. This facilitates both on-time loading
of the hoppers and transparent inventory management. Scanner systems were installed on the crane system to measure the height of the bulk goods. Scanners fitted below the crane bridge continuously track the height contours in each area of the bunker area. The software in the crane control centre uses the information to determine a precise height profile and visualises the fill levels in all storage areas, including the minimum and maximum amounts. The stored fill level values prevent the grab from touching down hard on the bulk
heap with a slack rope, further minimizing any damage to the husks when the stored product is handled and transported. The control centre shows the current
status of the crane with all relevant status messages. Customer-specific storage strategies can be added via the user- friendly interface at any time. Each crane features a touch panel and
a 7” display installed in the switchgear cabinet door. For system diagnostics, current operating and error messages are displayed in the order received, simplifying service work. Technicians can safely and conveniently carry out maintenance and any repair work from a walkway along the crane girder. The integration of the three cranes into
the existing bunker management system increases efficiency and transparency in managing the inventory. Demag realised crane communication with third-party programs for conveyors and output hoppers. The crane control and automation systems are optimised for operation with demanding and sensitive loads in a dusty environment at Vollers Holland and provide data on the system status, storage volume and operating processes in real time. At the request of the customer, the grab has attachment points for other loads as a special feature. At Vollers, this enables the crane to lift a mini excavator into individual storage compartments to sweep them clean once emptied. A few months after commissioning the crane-operated terminal, impressions at
Vollers are resoundingly positive. In the first nine months of operation alone, 80,000 tons of cocoa beans have been placed into storage. The automated material handling system with the three process cranes is reliable and ensures smooth material flow. Jaso has a longstanding relationship with Irizar Forge, where since 2002 it has supplied 10 cranes to the company, and in return, Irizar has manufactured crane components for Jaso, being one of its main hook suppliers. The fleet of cranes at Irizar Forge include: a 32t, 16,220-metre span double-girder crane; a 12.5t, 14,010-metre span double- girder crane; 32t, 14,010-metre-long double-girder crane; two 1.6t, 6-metre- span single-girder semi-gantry crane; a 5t, 13,995-span single-girder crane; 12.5t, 16,520-metre-long double-girder crane; 6.3t, 10,525-metre-long double-girder crane; 5/2.5-ton double-girder crane with a span of 11,870 metres and an 18t double- girder crane with a span of 16,220 metres. Among all of them, the 29.5-metre, 18t, 16,220-metre span double girder crane with a special open trolley, and integrated in its forging manipulator, stands out. Its main function is to manipulate steel parts at 1,200ºC while they are being forged in the presses. This crane has been designed to withstand the extreme conditions of a forge. The main feature of the forging manipulator is its maneuverability in confined spaces, as it is capable of multi- axis movements. This double girder crane
R ABUS overhead travelling cranes are used in steel production in Brazil. 38 | November 2022 |
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