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MacNeil Electric Drive Conveyor
Replies
I am concerned with what happens when the conveyor jams. Unless that gearbox is some kind of fluid drive or is clutched somehow the inertia of the electric motor will tear-up your conveyor. I used to have an old conveyor that used shear pins. A service man got lazy on a busy day and shoved a solid piece of shaft in the shearpin hole. The conveyor jammed and actually bowed up six inches on the exit section tearing the weldments right out of the concrete. Needless to say that conveyor was never the same afterward. What's in that right-angle speed reducer box?
The key to the electric drive and gearbox is that a VFD co0ntrols the motor, and it is settable for both torque and accel/deccel speed. This completely eliminates the need for shear pins, etc. Assuming you set the torque relief correctly, the conveyor will have all the power it needs and will also stall when it should, just like hydraulic.
We're running one at our 200' full service, and after the pain of dumping the chain 8-10 times while we tried to find the appropriate torque setting, it's been flawless for 6 months. I expect it to remain that way for a long time, until the day our trench fills with water, at which time the motor will be scrap metal.
We left the hydraulic motor laying there with bolts, ready to go, because some day that will happen.

