How Do Adjustable Crush Drums Impact Force and Torque Calculations?

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Discussion Overview

The discussion revolves around the design and calculations related to adjustable crush drums used for crushing materials, specifically bags of sugar. Participants are exploring the maximum force the drums can withstand, torque calculations based on motor specifications, and the impact of the adjustable gap between the drums on these calculations.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Debate/contested

Main Points Raised

  • Will describes the specifications of the crush drums, including dimensions, materials, and motor power, and seeks assistance in calculating maximum force and torque.
  • Will asks how the adjustable distance between the drums affects the calculations for force and torque.
  • Another participant requests clarification on whether the drums will be in contact or if there will be a gap during operation, and inquires about the size of the materials being crushed.
  • Will clarifies that the minimum gap is 20mm and the maximum is 70mm, and specifies the weights of the bags of sugar being crushed.

Areas of Agreement / Disagreement

The discussion does not appear to have reached a consensus, as participants are still clarifying details and seeking additional information before proceeding with calculations.

Contextual Notes

Participants have not yet established the assumptions necessary for the calculations, such as the material properties or specific equations to use for force and torque. The impact of the adjustable gap on the crushing process remains unresolved.

Who May Find This Useful

Individuals interested in mechanical design, particularly in the context of crushing mechanisms, as well as those involved in engineering calculations related to force and torque in machinery.

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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