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Excel has won a contract to build an import/export stillage conveying system for a product and residue store (SPRS) for Sellafield Sites.

The SPRS project will provide transfer, receipt, inspection, storage and retrieval of product arising from the Thorp and Magnox operations.

BNS Nuclear Services was awarded the contract to supply and manufacture all the mechanical handling plant and equipment for the facility and awarded the contract for the import/export stillage conveying system to Excel.

The import /export stillage conveying system consists of an import/export bay, a marshalling area and a loading/unloading area.

It must carry secure transport containers delivered to the SPRS building.

The Excel design comprises a quantity of chain-driven roller conveyors, a shuttle-car system and a scissor lift complete with powered roller conveyor.

Each powered roller conveyor has either a standby drive or manual crank-arm drive facility in case of a drive failure or power outage.

All conveyor equipment is designed to handle a capacity of 3,000kg.

The site transport vehicle reverses into a designated position alongside the scissor-lift conveyor and lowers its tailgate when in position.

A scissor lift with hydraulic power pack raises an off-board receiving conveyor level with the tailgate rollers.

The scissor-lift conveyor is mounted on a floating table top that extends and retracts pneumatically to enable the transfer of stillage from the transport vehicle.

Pneumatically powered side rollers centralise the floating top to align with the tailgate.

Electrically powered side arms pull or push stillages over the transport vehicle’s tailgate gravity roller section, depending on whether stillages are being imported or exported from the facility.

When importing stillages, the transport vehicle powers single stillages to a position on the tailgate and the scissor-lift side-arm arrangement moves towards the transport vehicle with shot-bolts retracted.

With the side arms fully extended, the shot bolts are pneumatically extended behind the front-end posts of the stillages.

The scissor-lift conveyor starts up as the side arms pull stillages onto the scissor lift; the conveyor then transfers them to an import sensor-switch, at which point it stops.

During this movement the shot bolts retract as the side arms come to their own stop position.

The floating top retracts and the feed-height adjusts via the scissor lift assembly to align with the in-feed conveyor system.

The stillage is fed into the SPRS Marshalling Area via a powered roller conveyor operating within an airlock enclosure.

In the marshalling area, a shuttle car, complete with powered roller conveyor and running on steel rails set into the floor, moves from a home position at the end of the track to an import roller-conveyor adjacent to the airlock doors.

The shuttle car receives the stillage from the in-feed conveyor and transfers it into the marshalling area, which comprises two load/unload conveyors and seven park conveyors.

If the load/unload conveyors are not available, the shuttle car will take the stillage to one of seven park conveyors to await transfer onto the load/unload conveyor at a later date.

As stillages travel towards the end of the load/unload conveyor, three sensors stop them to within +/-20 mm, enabling each Safkeg to be aligned with an overhead lifting beam for subsequent removal.

When stillages leave the handling area, they move back through the system to the transport vehicle on the import/export conveyor or park conveyors.

Excel Automation

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