Pallet Conveyor, Puck Conveyor, Unit Conveyor are all names for
Pallet Transfer systems. Pallet transfer systems move otherwise
non-conveyable items from point to point. Typically used in
automotive applications due to their flexibility, a pallet conveyor can
move engine blocks, transmissions, seats, wheel assemblies, any part of
an automobile, van, truck or bus. Shown in the picture below
moving a hydraulic cylinder.
Unlike other types of conveyors, the item being conveyed
on the unit conveyor doesn't come into direct contact with the conveyor
surface. Instead, a uniform pallet ( or puck ) contacts the
rollers and the conveyed item rides on top of the puck on a top plate
with a fixture specifically designed for that item.
Material Handling Equipment
The
system is designed using friction-clutch rollers, which means that when the pallet gets stopped at a
work station, the frictionable surface of the pallet forces the rolling surface of the
rollers directly under it to stop, while the internal clutch (and chain
drive) continues
to run. The weight of the roller is supported in the middle by the
roller shaft, not by the chain. This results in a true tangential
force applied by the drive chain to the rollers and a smaller motor.
So, the downward force of the pallet is supported directly by the
roller, not by the drive system, resulting in a simpler, lower
maintenance system, that is less likely to fail.
Our Pallet Transfer System has a true engineering
elegance that is too detailed for a single webpage. When compared
with traditional pallet transfer systems, you will agree that the system
we sell has a simplicity that others can not match. The design
that you read about on our pages took years of effort to develop, and
has gone through many upgrades. Simplicity of design isn't simple
to achieve. If
you need to handle a workpiece that can not be conveyed directly, please
read more. Material
Handling Equipment
Advantages
Maintenance - Due in large part to the friction-clutch roller,
we have an almost maintenance free system system. If a roller
should go bad, it is easy to replace, chain removal is not
necessary. Only a few minutes are required. The pins
that stop the pallets are a standard item, no matter how many
assembly stations you have, the stopping pins are all the same.
These pins are pneumatically actuated and should rarely fail.
Simplicity - With our system, typically the conveyor motors run
all the time. There is no stopping and starting of motors.
This will drastically reduce the control complexity. All of
the devices, Pin Stops, Diverters, Junctions, Elevators, etc. have
been engineered to be as simple as possible. For instance, the
Pin Stops require only one control input and one control output.
The input is for the pallet sensor, the output is for the pneumatic
solenoid supplying air to the pin.
Safety - The main two things to worry about with a system of
this type is getting pinched by a roller and getting caught in the
chain. Both of these concerns have been engineered away.
The rollers are mostly friction-clutch, so if you should sit or lean
onto them, they simply stop turning. The drive chain is
covered by a plastic guard that fits snuggly into the aluminum
extrusion guides of the conveyor.
Cost of Ownership - Cost of ownership is reduced in two ways
over traditional systems. First, the general simplicity means
that there are less breakdowns. Less breakdowns mean less
money spent for parts and less time spent fixing the problems, and
less production time wasted. Secondly, modularity of design.
Because the system is designed around a collection of standard
devices, i.e., stops, diverters, lifts, etc., these devices can be
organized in a different way and re-used in an entirely different
application in the future. The conveyor sections can also be
easily re-used.