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The Arnold Company is the number one Railcar Gate Door Opener manufacturer in the United States. As home of the Door Demon® Railcar Hopper Gate Door Opener, we specialize in making custom designed Railcar Gate Door Openers to meet the specific needs of your working environment! We also carry a full line of Industrial Vibrators.

We take pride in our product selection, product quality, and personalized customer service! We offer our customers affordable, practical solutions to their Railcar Gate Door Opener needs and stand behind our products!


Conveyor Mounted Door Demon®
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Conveyor Mounted Door Demon

Conveyor Mounted Door Demon®





NEW FOR 2012: 20% Torque Power Increase. We are now using a new Char-lynn drive motor that provides the extra torque you need!

The conveyor mounted system gets its power from the 12-volt system on the conveyor. We do not tap into the conveyor's hydraulics but “make our own”. This keeps the integrity of the manufacturer’s equipment intact should there be failure; there are no pointing fingers. In a nutshell, this is our DC unit running on 12 volt from the battery on the engine.

We use a SPX Stone pump and 12 volt DC motor, couple it with the our Char-Lynn Eaton hydraulic motor and set to the same specifications as all our units. We run at 2950 psi and 2 gpm. The controls are next to the hydraulic controls on the unit; the operator is not jumping around to start and stop the belt or regulate the flow by closing or opening the door.

The opener is mounted on a 4” beam and slides to either side. This system allows for a moving capstan and any width gate while still aligning the product drop point to the conveyor. It is very slick.


The Arnold Company already had the widest variety of door openers but has solved another application issue with the Conveyor Mounted Door Demon®. Being the only company that concentrates solely on gate openers allows for maximum customer interaction and problem solving. As in this case, listening to the customer needs resulted in a new product solution.

Application: The already proven, smooth hydraulic opener rides from side to side on a 4” beam. This allows it to be used on either side of the conveyor, on moving capstans, and on any width gate while still aligning the product drop point to the conveyor. The controls allow for opening and closing of the gate from either side of the conveyor.



Product Features:

Can Be Mounted to Any Size Conveyor
Custom Expandable Shaft Lengths
12-Volt DC Power Unit
2 gpm @ 2950 psi
1800 ft/lbs @ 12 rpm
Directional Controls with Variable Speed in Both Directions
Safety Enclosed Kill Switch for Quick-and-Easy Shut Off




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