Trolley wheels 3

[b_o]

Hello!
Not sure which forum is the best for this question. Currently we are using 4 cast iron castors for trolleys for bulk material transport (800-900kg). Due to the wear on the steel floors we would like to change the wheels to something else. I see that often polyurethane wheels are used, but due to the risk of trollies tipping when turning we are looking for something that is easier to slide on the steel, yet is still robust enough and won't wear too quickly. Does anyone have experience with HPDE or nylon or similar wheels?

Thank you!

 

[robyengIT]

wheel made of cast iron alloy so called "Ny-hard" (probably the steel of the floor will have wear)

 

[dhengr]

B_o:
What size are these trolleys, plan and elevation views, with dimensions and structural makeup would be helpful. Why not two primary casters, one under each side rail, at the center line of the trolley? Then, two slightly smaller diameter swiveling casters, one under each end rail, at its center. The primary casters carry most/all of the load, and the smaller end casters carry any imbalance loading, and allow the trolley to be steered, without skidding or tipping.

 

[FLCraneBuilder]

There are a range of hardness's of the poly wheels available
consider one of the harder materials?

also suggest speak to the poly wheel company sales engineers - they may have thoughts on this

 

[b_o]

Thank you all for the answers!

@RobyengIT Google only gives me results with nylon wheels when I type in Ny-hard. No specific matches with an alloy called ny-hard though.

@dhengr Currently we are using 2 swivelling casters at the front and 2 stationary ones at the back (size: 200 x 50). Your idea would probably improve tipping risk but it is currently impossible to implement. A lot of metallic dust in being generated. It is probable that it is coming from the floor so we would like to change that.

@FLCraneBuilder Do you mean polyurethane wheels or polyethylene wheels? We are using polyurethane wheels on the tractors but due to the friction it seems that same type of wheels on the trolleys would cause more tipping and accidents.

 

[LittleInch]

Try talking to people like this?

https://www.castors-online.co.uk/ac...l_castor__castors_and_wheels_supplier_uk.html

Remember that you rolling resisrance will go up so do some calculating to see if you can actually move to another material. Moving 900 kg around you don't want to add too much extra force to move it.

There's a reason trains use steel wheels. ...

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[robyengIT]

I meant you have to manufacture your own wheel either in steel (as suggested by LittleInch) or in carbon steel coated by Ny-Hard to make them replaceable (only the Ny-hard)

 

[b_o]

Thank you for all the help!

 

[LittleInch]

You might get more relevant assistance in the mechanical engineering general forum once you get a bit more info together.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[dhengr]

B_o:
To minimize tipping, pull on the trolleys from the lowest level possible. This minimizes the tipping moment from that pulling action and the resistance of the wheels as they adjust to the turning action. Keep the front caster swivels well lubed, and be moving when you start to make a turn. You said 800-900kg (that’s 2000lbs.) with 200x50mm cast iron casters (that’s 8” dia. x 2” wide) casters. Take a look at McMaster-Carr or Graingers on the internet, you should find something that fits your needs. We can’t do that for you.