Re: Safety In Underground Mines
Roland
I know this is not OSHA but it is the Canadian equivelant. This is what I follow in Canada.
http://www.e-laws.gov.on.ca/html/reg...s900854e.htm
search on "brake" (using the "find on this page" in the web browser menu) you will find some info on what you are looking for. ■
Gary Blenkhorn
President - Bulk Handlng Technology Inc.
Email: garyblenkhorn@gmail.com
Linkedin Profile: http://www.linkedin.com/in/gary-blenkhorn-6286954b
Offering Conveyor Design Services, Conveyor Transfer Design Services and SolidWorks Design Services for equipment layouts.
Narrow Guage Rail Cars U/G
Originally Posted by roland heilmann
dear collegues of the american hemisphere,
i need urgently to know whether there're in the osha
universe any specific requirements which could be applied
to brakes of a moveable cart in an underground mine.
Moveable cart: Approx. 1 m/s , moving with wheels on rails,
2..4 maintenance peoplel on board, steep incline of up to 15°.
Drive: Redundant selflocking twin chain drive with acc. Doubled safety.
The mineral mined is not explosive in any way but the environment rather very dusty.
Brakes are to be used for clamping at worksite or emergency stopping of the cart when
all other links broke down or power fails.
Thank you in advance &
regards
r.
Hello Roland,
ANY and I mean ANY incline or slope that is of a high angle will require either a COG
rail or a double drum tugger hoist.
The problem is the angle, anything above 4 percent is going to require
the installaion of a cog railway with either a single or double cog rack track.
www.warrenequipment.com/mine
www.irwincar.com
These folks can help you quickly as they work with MSHA regulations with regard to
rail haulage of supplies ore and and personell underground.
There is no way that MSHA would allow a free powered car on a slope of 15 degrees
unless a rack rack system was employed or a tugger hoist was required for car movement. ■
Going On
Dear collegues,
thank you so much for your support!
Gary, this is quite helpful, as i find better understanding about the basic safety understanding for such application.
I still seek reliable numbers / design values as to safety requirements when designing the mechanical elements of that brake, which shall be Belleville spring applied and hydraulically released.
Izaharis, i'm very much with you what concerns a maximum reliable and safe solution. However, that twin chain drive is a border condition of the project that i cannot influence. But i shall thoroughly look through those links you sent.
Thank you once more,
Best regards
R. ■
Safety In Underground Mines
Originally Posted by Roland Heilmannthank you so much for your support!
Gary, this is quite helpful, as i find better understanding about the basic safety understanding for such application.
I still seek reliable numbers / design values as to safety requirements when designing the mechanical elements of that brake, which shall be Belleville spring applied and hydraulically released.
Izaharis, i'm very much with you what concerns a maximum reliable and safe solution. However, that twin chain drive is a border condition of the project that i cannot influence. But i shall thoroughly look through those links you sent.
Thank you once more,
Best regards
R.
Hello Roland,
Do you know specifically whether this mine has a tugger hoist with a
counter balance car set?
The hydraulic retracted spring brake is the normal state of affairs here
and works well
Unless a cog/rack rail used there will be no traction and I mean NO TRACTION
OR ADHESION even for stopping to set a brake at that ruling grade of fifteen percent. ■
Applied Force
Hello Izaharis,
there's no such device at that site, to my knowledge. Also, the tunnelling is never steeper than 15°, there's no classical mine shaft operation as such.
The spring application is one of the issues which concerns me most: I shall have to "overstress" the springs during most of the time in lifted state of brake in order to obtain a useful amount of spring force when applying the brake = releasing the springs.
For braking, i do not use the wheels or the wheel - rail contact. I join the brake to the rigid structure of the cart and apply the brakes directly to the rail. This works quite alike a classical rail clamp.
Thank you for your commitment!
Regards
R. ■
Safety In U/G Mines Continued
Hello Roland,
I forgot to mention that your brakes will have to be
certified by MSHA and that takes a bit of time.
Heres a list of brake makers to help you with this
BUT AS I SAID the MSHA folks will not permit this
without a wire rope tugger hoist or a cog rail set up.
www.nexengroup.com
www.midwestbrake.com
The midwest folks are the ones I am most familiar with
www.hindon.com
www.dynamatic.com
www.kebamerica.com
www.stromaginc.com/spring-setbrake.html
www.ogura-clutch.com
www.gkn.com
www.huco.com
www.vortex-clutch.com
www.stromag.com
www.sepac.com
www.matrix-international.com
www.magnetic-powder-brake.com
www.mdacontrols.com
If you contact midwest brake they can provide you with a brake,
BUT MSHA will still need to certify it for use and witha ruling grade of 15%
it will lock but the car will not stay in place and will slide unless it is physically
raised off the rails with four hydraulic leveling jacks with pilot operated valves
to prevention of fluid loss. ■
Off Limits
Dear Izaharis,
thank you once more!
Some more input from me:
The brake, these brakes (4 per cart) shall be specially designed to meet clients needs, however they shall not be covered by a MSHA certificate requirement. Yet.
See, that is my concern to do the right thing --> as such certification process would be a no-deviate in-depth design check & approval.
One can aspire to be the ONE designer, however my professional opinion is that independent eyes, independent input & check is a most valuable corrective i shall seek as i can.
That's why i'm here.
Best regards
R. ■
Safety in Underground Mines
Dear collegues of the American hemisphere,
i need urgently to know whether there're in the OSHA universe any specific requirements which could be applied to brakes of a moveable cart in an underground mine.
Moveable cart: approx. 1 m/s , moving with wheels on rails, 2..4 maintenance peoplel on board, steep incline of up to 15°. Drive: redundant selflocking twin chain drive with acc. doubled safety.The mineral mined is not explosive in any way but the environment rather very dusty.
Brakes are to be used for clamping at worksite or emergency stopping of the cart when all other links broke down or power fails.
Thank you in advance &
Regards
R. ■