Integration of off the shelf mechanical powertrain wanted

How big is your hammer mill?

Do you any idea of HP required and duty cycle??

10,000 RPM sounds extremely high for a max RPM.

My best suggestion would be a hydrostatic drive. This would apprear to answer most of your requirements except the air seal. Inertia of the mill would also be a concern in preventing damage but no drive can overcome that problem.

Thanks for your comments and questions. Regarding size, it has a cross section of one foot. Its outside dimensions are eight feet.

In terms of tonnage or throughput, it is unknown as yet. I would estimate roughly fifty tons of throughput an hour.

I am making an estimate of a maximum of five hundred horsepower. A typical diesel for a truck.

The RPM max is so we have a range of processing capabilities. Typically we would anticipate a lower range in the three thousands. However, it is necessary to be operate at that higher range on a steady basis for specialized materials processing.

A hydrostatic drive sounds interesting. Could you explain?

Do you have any ideas on the air seal? The dust being forced back into the grind chamber by air pressure sounds like the safest and most practical method initially to us. Have you seen any you would suggest?

As for the inertia, I have envisioned some kind of torque limiters that would reset possibly, automatically. However, just disconnecting if it had a jam would be sufficient.

Thanks for your thoughts.

John

A hydrostatic drive consists of a pump and motor directly driven by each other. The pump output port is connected to the motor input port and the motor outlet port is connected to the pump inlet port. There are auxillary systems for pressure control and leakage makeup as well as bleed off for cooling and filtering.

The big advantage to this is that the pump may be variable displacement and control of the pump can be achieved using a servo or porportional valve driven by TTL signal levels from a PC through the appropriate driver card.

If a jam occurs the pressure in the drive side rises rapidly and a high pressure relief valve opens and motor torque drops rapidly. This however will not happen fast enough to act as a safety disconnect in the event of a high speed jam. I am not aware if anything which could do this satisfactorily and allow start up and normal operation transmitting 500 HP.

These combination of characteristics can achieve most of your need I believe since all parts are available from several manufacturers, I would start with Eaton hydraulics, find the local distributor who would me more than happy to help with the details.

Regarding the air seal, I have seen on older turbine engines a shaft seal which may be adapted using an additional air source, however I can offer no source of such a seal.

There are also several contributors on this group who are knowlegable in hydraulics and probably more current and certainly closer to your location. I am located in central Ontario Canada.

If you need more information just ask.

Thanks. That sounds interesting. I will follow up with your suggestions. Do you do any consulting? I would be interested in your services if you do.

As for the quick disconnect, I have seen different types of torque limiters. Perhaps hoping for an automatic re-connect is too much. I would be OK with just a sheering of a limiter to protect the power train, if that is all we can do. I have seen what look like electronically controlled torque limiters that might do the job, but I do not recall where.

Any more suggestions or information would be greatly appreciated.

Ecentric balance works well too depending on rotational speed, torque/HP and duty cycle.

What is Ecentric balance?

I am interested in any comments you might make. Perhaps you might examine the other comments and tell me what you think?

I Design Stuff....sounds like a cool project....we dont have anything on the shelf as such but would be able to modify a few components that we have lying around to get you up and running....

I can be contacted at http://www.alnoproductservices.com.au

we would love to help out please you could supply us more detail on the following:

What is your budget?

What is that life cycle of powertrain that would meet your needs and or expectations?

How much horsepower do you require?

How long have we got before you would expect delivery?

or maybe a sketch of what you are thinking about

hope to hear from you soon

Anthony