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RADII-INCHES
All TableTop
®
chain conveyors should provide for proper amount
of catenary sag to balance the chain tension which is not
absorbed by the drive sprocket teeth. TableTop
®
chains should
never be run tight. If chain sag is excessive or increases due to
wear, it should be adjusted, by removing links, to the proper
amount of sag. Take-ups are not recommended. If space does
not permit catenary sag, consult Rexnord Corp.
CATENARY SAG
ENTRY RADIUS
A generous entry radius to the return section should be provided.
This permits the chain to feed smoothly onto the return ways.
This curve radius should be greater than the minimum
backflex radius for the chain.
For TAB chains to be returned on hold-down TABs, it is
recommended that chains be guided onto the return wear strips
using a guide shoe or pan with a generous entry radius greater
than the minimum backflex radius.
At the entry to the return wear strips, provide rounded corners to
prevent catching or snagging of chain flights.
ROLLER RETURNS
As illustrated, instead of sliding returns, chain may be returned on
support rollers or shoes. It is important that the first roller or
support shoe be located far enough away from the head sprocket
to allow for proper catenary sag; dimension "A" should be greater
than the distance between rollers, "B".
The preferred diameter of rollers should be at least two times
greater than the minimum backflex radius for the chain. (Refer to
table "Minimum Backflex Radii"). For example, when used with
820 Series chains, roller diameter should be 3 inches or greater.
Roller and support shoe returns are not recommended for
base roller chain design chains.
TRAVEL
HEAD
DRIVER
150° MIN. WRAP
ENTRY RADIUS
TAIL
CHAIN SAG -- 3" TO 5" WHEN RUNNING
18" TO 20"
TYPICAL SPACING
NOTE: 2'-3-1/2" FOR 1843
NOTE: 20-24" FOR BASE ROLLER CHAINS
RETURN WEAR
STRIPS
GUIDE WITH PROPER
ENTRY RADIUS
ENTRY
DIRECTION
RELIEF OR RADIUS
ENTRY DIRECTION
Top View
Side View
RETURN
WEAR
STRIPS
MINIMUM BACKFLEX RADII - INCHES
815
820, 831
821
843
845
963
879, 880
6
1/2"
1
1/2"
1
1/2"
6"
18"
6"
1
1/2"
881
882
1843
1873
1874
3873
LBP821
LBP882
LBP883
1
1/2"
1
1/2"
2
1/2"
12"
10"
7"
16"
9"
2"
Chain Series
Number
Min. Backflex
Radius
Chain Series
Number
Min. Backflex
Radius
USE LAST ROLLER OR A
GUIDE SHOE (AS SHOWN
ABOVE) TO GUIDE
SIDEFLEXING CHAIN ONTO CORNER
RETURN WEAR STRIPS
B
B
(1 - 2 FT)
A
(1.5 X B)
HEAD
SPROCKET
CORNER
WEAR
STRIPS
NOTE: Allow for 3873 top plate "kick-up" at headshaft of 0.15-
inches and at tailshaft 0.50-inches.
CATENARY SAG
ENTRY RADIUS
ROLLER
RETURNS
Re
x
®
T
a
b
leT
op
®
Chains
Rex
®
Engineering Manual TT-7
Содержание 1874
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