Traction wheel turns are
gaining general acceptance as the most satisfactory means of
accomplishing a change of direction in a horizontal plane on an overhead
trolley conveyor. Although less economical at first cost than roller
turns (particularly for 90° or less),
traction wheel turns provide several advantages which tend to offset the
cost factor through improvement in system operation:
- Reduced chain pull.
- Smoother operation - particularly at
high conveyor speeds.
- Reduced chain wear - the traction
wheel carries chain around the turn.
- Simpler maintenance - only one
lubrication point.
Traction wheels turns are particularly
recommended for installations where ease of maintenance, low friction,
maximum operating efficiency are prime system requirements. They are
especially well suited to applications involving dirty or corrosive
atmospheres, in such elevated temperature installations as drying ovens
and high-temperature process lines, and in such inaccessible locations
as industrial washers and steam chambers.
Anchor standard traction wheels are of
the plate type. This is a simple, rugged wheel preferred by many users.
The web of the wheel is a solid, flame-cut plate to which a heavy rim is
joined with a continuous weld. The center is machine-bored and bolted to
a flange on the hub assembly.
The spoke-free, solid center provides an
inherent safety factor for men working below or above the turn. Special
traction wheel turns other than plate type can be furnished on request.
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Anchor overhead trolley
conveyor turns are installed so as to impose no added load on the rail.
They are constructed with a separate mounting frame from which both the
rail and shaft mounting block are supported. This sound construction
method simplifies installation in addition to providing a rigid, well
braced turn. The separate mounting frame enables the turn to withstand
chain pulls far in excess of any that might be encountered in service,
providing an inherent strength safety factor not found in systems where
the rail itself provides the backbone for the turn.
In relation to
traction wheel turns, diameter refers to nominal wheel diameter and arc
of turn refers to degree of change of direction in the horizontal plane.
Standard diameters for Anchor traction wheel turns are 24", 30", 36",
42", 48", 54", 60", and 72". Other diameters are available on request.
Any arc of turn up to 180° can be provided.
Anchor traction wheel turns can be
supplied with a wide choice of bearings. Bronze bushed, lubricated-for-life, tapered roller and graphite
non-lubricated are among the type available. Lubrication type traction
wheels are generally supplied with a grease fitting in the bearing cap,
but can be furnished for remote lubrication through the shaft.
When laying out the conveyor path,
always provide a length of straight rail equal to one trolley spacing
between the tangent points of adjoining horizontal and vertical turns.
In determining the proper size turn to
use, care must be taken to insure no interference between adjacent loads
as they negotiate the turn.
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