Hello

I have used the following makes of brakes:

-Voith

-Stromberg

-Binder

-Clipper

-Stratford

For downhill conveyors I normally use a combination of high speed as well as low speed disc brakes. However, I have to do a complete analysis of all braking times and conditions to establish the best positions and types for all the mechanical equipment including the take-up system.

LSL Tekpro ■

The world's largest braking system is installed on the Los Pelambres, Chile 25000 kW downhill on three flights.

The brake design is a CDI proprietary system which uses novel concepts, CDI control algorithms and hardware specifications:

1. A digital and analog hydraulic fail-safe concept.

2. Quick-response system for such large systems. Quick response is used to evacuate the hydraulic fluid in a low millisecond time cycle, not possible with normal brake action due to fluid inertia valve timing and flow, and spring response delay.

3. Control of mechanical over-braking which would otherwise lead to excessive stress on belt, ts splices and mechanical components. This occurs when emergency braking might be applied and all tolerances build up to an unacceptably low belt safety factor (< 4:1).

Other large CDI and Partners downhill systems are:

1. Collahuasi (8000 kW) with Krupp in Chile

2. El Abra (7500 kW) auditor to Cyprus Mining Co and ManTakraf

3. Phelps Dodge, Morenci (6000 hp) with Fluor, in Arizona, USA

4. Kennecott ( 2 x 6000 hp) in Salt Lake City, USA PWH/Krupp/Robins

5. Quintette ( 2 x 3500 hp) in Canada redesign of a French system

6. Capito do Mato, Pico and Matuca for MBR and MGS in Brazil

7. many others for overland dynamic controls and sequencing

We use:

1. Johnson Brakes, Canada

2. Bubenzer, Germany

3. Svendborg then Asea

4. Twiflex, USA

5. SIME, France

6. Voith was used on Kennecott and Palabora but I am not aware of recent activity ■

Dear wgbtransmission,

Please tell me what you wish to know. Then I will know what you know and what I can tell you.

Are you trying to engineer the product or conveyor?

There is a great deal of detail that needs to be known off the top such as:

1. Shock wave intensity

2. Motor sizes

3. Tension, speed, width, modulus, beltline geometry, capacity ...

4. Take-up system

5. Need for fast verses not so fast control response

6. Heat load on disk (disk and pad sizes)

7. Pulley size and slip control

8. How far you are from conventional or well known installation specifications -- how much advanced engineering is required.

9. How you have approached safety HAZOP issues and all "what if " scenarios.

10. Available components and your knowledge of their applicability

We have published some technicals on some brake systems. We normally do not make public current intellectual property -- leads to too many "me toos". If you wish a pdf of these please contact me via my email below and for any further interaction between your company and ours.

If we do establish communication, I will provide some photos of the larger systems and other informative details. ■

Hi All,

I believe that the 'boomerang conveyor' paper is ne delivered by Peter Gilbert of Nepean Conveyors at BELTCON 13. Check out the BELTCON site fo a link.

Regards,

Adi Frittella ■

Too true Adi..

There is also a paper on brakes by Kjeld Liisberg of Svenborg brakes Denmark in the Beltcon 13 collection.

Cheers

LSL Tekpro ■

Hi Lyle,

Tried to attach a copy for you on this site - too big. I'll try to send via personal message.

This as well as paper on CDI "Curved Chute' for Palabora Mining and many more good things all discussed at BELTCON series of conferences.

THIS YEAR BELTCON 14 AUGUST 1 and 2 IN JOHANNESBURG SOUTH AFRICA

Regards,

Adi Frittella ■

Dear Wgbtransmission,

I am not sure of the nature of your question. Are you seeking advice or assistance? There is a small language interpretation issue. You say "Please be informed how to". Do you mean "please inform on how to"? The first is a statement and the second is a request.

Sending technical details is too encompassing. This would take a book to fill all issues. We will not write a book, nor divulge all intellectual property. The forum is an advise column on how to solve material handling problems, not on engineering the problem

.

It seems that you do not have a specific point of interest or project. I seems that you are canvassing the field searching for who knows what and how you can be informed on the details.

I do note, your different request between the first and more recent posting. First you sought knowledge on large scale systems which may imply comprehensive, complex, and modern brake systems.

Later you noted to make the brake system more conventional in you comment on not only novel, but also qualified. All good engineers will provide qualified. There are many tests to measure qualified such as safety, reliability, functionality, availability, and cost.

Please be advised, there is no interest in making any mechanical design more complex than is necessary or desirable. If there is a better method, per the noted features stated above for the present/future than from the past, then the present /future will usually be applied.

You need to have an evaluation and comprehensive report that delineate the modern verses ancient/historical differences to make an informed judgment. This usually implies input into the overall design details and not just on component of the design. ■

WB,

I see no emails. ■

Svendborg is a Danish company. ■