Siemens milltronics TEST CHAIN, Инструкция по эксплуатации

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Page 6 Test Chain – INSTRUCTION MANUAL 7ML19985JD01
Chain Reel
Location
On incline conveyors, the chain reel must be carefully installed upstream of the scale
weighbridge so the chain rolls out with the movement of the belt. "Upstream" is when you
look from the conveyor tail or infeed end towards the head or discharge end of conveyor.
On a level conveyor, locate the reel prior to the scale position.
Facilitate chain payout over the scale by jogging the belt until the chain rolls into position.
Mount the reel to the conveyor about 4 to 4.5 idler spaces from the scale center line. This
places the support legs of the reel about 1.5 spaces from the end of the test chain for easy
attachment to the restraining device.
Once the chain has been secured at both ends, the cable from the reel can be detached
and the belt restarted for the calibration process.
Reel Size and Compartment Diameters
The size of the reel is determined by the requirements of the specific conveyor
application and the selected chain loading. The width of the conveyor (18” [46 cm]
through 72” [183 cm] belt conveyor), its incline, and its general construction determine the
reel cross member length and section sizing for that member.
Compartment disc diameter is determined by the following:
• Chain length, pitch, and roll diameter
• Wire rope and chain wrap around the reel drum
• Chain wrap around the successive wraps of chain
• The number of rolls in a given wrap increase with each revolution of the reel
• The number of wraps the reel disc holds depends on the given chain parameters
• As few as one to two wraps, to as many as nine wraps
• Overall wrap diameter varies from about 12” (30.5 cm) for the shortest chain to
about 49” (124.5 cm) for the longest chain.
Specifications
• 6" (15 cm) pitch test chain, 20 ft
(609 cm) long
• 42 rollers long, 41 pitches long
• roll diameter: 3.75" (9.5 cm)
• disc diameter: 36" (91.5 cm)
Test Chain.book Page 6 Tuesday, April 19, 2005 9:34 AM