How Do Adjustable Crush Drums Impact Force and Torque Calculations?

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The discussion focuses on the design of adjustable crush drums for a rock crusher, emphasizing the need to calculate maximum force, torque, and the force exerted by the drums. The drums are 170mm in diameter and 200mm long, driven by a 0.75hp motor, with an adjustable gap between them ranging from 20mm to 70mm. The user seeks guidance on how the adjustable feature impacts force and torque calculations, particularly with blades attached to the drums. Additional details include the drums being mounted on a steel axle with heavy-duty bearings and powered by a chain and sprocket system. The inquiry aims to ensure effective crushing of sugar bags without jamming.
frenchw
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Ok This is a long question so bear with me. BACKGROUND: I am designing a set of crush drums that counter rotate (similar to a rock crusher). One Drum is adjustable to increase/decrease distance between drums. Each drum is 170mm in diameter, 200mm long, made from 10mm thick steel. They are chain driven by a 0.75hp motor (550w, 50hz, geared down from 1400rpm to 155rpm)

Similar to this http://w13.itrademarket.com/pdimage/05/1934405_doublerollcoalcrusher.jpg

Ok so this is where it takes some imagination, If you could please tell me what I am missing and if I had it how to carry out the equation.

I want to find out:

- what the maximum force the drums could take without jamming

- Torque (the original rpm was 1400 but from a series of sprockets the rpm is now 155)

- What force is exhorted by the drums

I have blades on my drums. One drum can be adjusted on the x axis. How does this affect my equations.

Could someone please take their time to explain this to me. Attached is a 3D pdf of my CAD. The belt and pulleys represent chain and sprockets

Extra Info: Each drum is welded onto a 350mm steel axle with a diameter of 25mm. Each drum has a 10mm thick plate either side with a 25mm hole in which the axle passes through. The axle sits in a heavy duty flanged bearing. The way the drums are powered are by sprockets and chains in the exact same layout as this charcoal crusher http://www.wolterpyrotools.com/image/charcoal_crusher_2000.jpg except instead of a handle, another sprocket leads a chain to the 0.75hp motor

Regards,

Will
 
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Will, I did not find you CAD drawing. Was it attached?
 
Do you intend to have the two drums in contact as you have shown them,, or will there be a gap between them? How large will the pieces be that are being crushed compared to the drums?
 
The crush drums are adjustable, Minimum gap 20mm and largest gap 70mm. They are crushing bags of suger (500g, 1kg and 2kg bags).

Will
 

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