Portec Spiral-Lift® Specifications

Spiral-Lift^® Conveyor

TECHNICAL SPECIFICATIONS

Frame Assembly:

The all-metal frame is fabricated using the following materials:

A. Frame sides	12 gauge (2.65 mm) steel
B. Slider bed	12 gauge (2.65 mm) steel
C. Chain cover	Fabricated steel (2.65 mm)

Welded 1/8" (3.18 mm) thick angle steel cross members provide a solid conveyor platform. An 1/8" (3.18 mm) thick steel angle is welded on the lower edge of the frame side to attach floor supports.

Standard Conveyor Belt: 2-Ply Black SBR-RT
Belt material:	Scandura 2-Ply 160# Black SBR Roughtop SGBL-2N
Belt top cover:	Black SBR rubber with grade 1 Rough Top
Thickness:	.25" (6.4 mm)
Allowable working tension: (2% elongation)	160 lbs./inch width (28 N/mm)
Underside:	Low friction bare back
Belt fabric:	2-ply polyester
Fire rating:	ISO 340 fire retardant available upon request
Seams:	#1 Clipper lacing for quick belt replacement with nylon lacing pin
Chain attachment:	#4 brass steel grommet, 1040 steel rivet and washer, and nylon brushing

Belt Drive system: Unlike friction drive straight conveyors, the Protec Flomaster Spiral-Lift conveyor does not not use the end roll to drive its conveyor belt. The belt is driven by its outside edge by the belt drive chain. Special chain attachment links connect the belt drive chain to a series of grommetted holes along the outside edge of the belt. The drive chain is positively driven by a shaft-mounted sprocket. This positive drive arrangement is unaffected by changes in loading, tension, temperature, humidity and foreign material getting between the bottom of the belt and the end rolls. When conditions change, there is no requirement for immediate attention to maintain the functional operation of the conveyor. Because the belt is merely a carrying surface and high tension is not required for operation of a chain driven conveyor, belt life, as well as integrity of belt joints, is greatly enhanced. The positive drive design is also very conducive to using mechanical lacing because concerns of damage to the end roll lagging (no lagging is required) are non-existent. Even in difficult access areas of a conveyor system, mechanical lacing allows for fast and efficient belt changes because, unlike conveyors with vulcanized endless splice belts, extensive disassembly of the conveyor is not required.

In contrast, friction driven belt conveyors require exact tension control and adjustment to continue operation, and small changes in conditions can immediately affect functionality. On friction drive units, high belt tension to maintain driveability transmits high stress levels to the belt joints; decreasing belt life and increasing maintenance demands. Also on friction driven units, end roll components (shafts, bearings, pulleys) are subjected to much higher stress levels due to the required belt tension. Life expectancy of these components is necessarily shorter.

The conveyor belt uses #1 Clipper lacing to connect the belt ends. Clipper lacing has a high strength and is perfectly suited for the 2 ply SBR or PVC belt material. Laced seams allow the conveyor belt to be easily removed for replacement or repair without disassembling the conveyor. A solid nylon pin is used to connect the lacing.

Belt Drive Chain: #50 sidebow steel chain with belt attachment links

Material:	heat-treated, carbon steel
Ultimate tensile strength:	5420 lbs.
Maximum working load:	640 lbs.

End Rolls and Shafts:The all-steel end rolls are formed and welded using 14 gauge (1.89 mm) steel. The hubs are machined from steel and welded in each end.

The end roll shaft is turned, ground and polished 1045 steel. Each shaft is keyed to fit the end roll. Drive shaft extension is provided on one corner as specified. Extra shaft extensions can be provided if the drive location is known at the time of the order.

End Roll Bearings:All bearings are precision, sealed for life, and fitted in a cast iron housing.

End Roll Sprockets: Steel beveled tooth sprockets for #50 sidebow chain. Conveyors with an outside conveying radius less than 47" (1194 mm) use 17 tooth sprockets. Conveyors with an outside conveying radius of 47" (1194 mm) or greater use 27 tooth sprockets. Conveyors with conveying widths larger than 39.38" (1m) use 40 tooth sprockets).

Return Rolls: Several rubber covered precision ball bearing wheels spaced across a 5/8" (15.9 mm) diameter steel shaft support the returning belt. This system is considerably quieter than hollow cylindrical steel rollers, which are often used on belt conveyors.

Sideguards: Standard sideguards are built from 14 gauge (1.89 mm) steel. If the sideguards are higher than 12" (305 mm) above top of the belt, there will be a 1" (25 mm) outward facing top angle. Sideguards with a height of 12" (305 mm) or less will have plastic Trim-Lok^® protective strips on the top edge. The distance between sideguards is 1" (25 mm) wider than the belt width. Sideguard height is measure perpendicular to the top surface of the belt. The sideguard ends are vertical.

Paint: Portec Flomaster Spiral-Lift conveyors are normally painted with a DTM (direct to metal) paint in one of 4 standard colors. Check the current Portec Paint Policy for a wide range of optional colors and paint types.

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