Least cost is place small brake on head pulley high speed shaft. Can also act as sort-of-holdback. This assumes conveyor does not roll back when stationary. However, your conveyor will likely roll back with 10% grade. You need engineer to give you details and timing if using brake as hold-back.

Brake can be electric solenoid for reliable service. ■

Hello Chirucan,

For the application mentioned by you, the best location for the brake is on high speed coupling of the drive unit. It will give proper performance and it is also economical. It is too small a conveyor to have a separate location for brake.

Regards,

Ishwar G Mulani.

Author of Book : Engineering Science and Application Design for Belt Conveyors.

Author of Book : Belt Feeder Design and Hopper Bin Silo

Advisor / Consultant for Bulk Material Handling System & Issues.

Pune, India.

Tel.: 0091 (0)20 25871916

Email: parimul@pn2.vsnl.net.in ■

Hi Chirucan..

You do not mention the conveyor's capacity.

If low capacity, you should put a "high speed" holdback as an integral part of the drive's gearbox.

If high capacity, the drive would be more substantial, and the higher inertia of the drive would tend to explain the long run-on time when coasting empty.

If the holdback torque is greater than 12kN-m at the pulley, then a low speed holdback is indicated, and should be situated on the opposite side of the drive head pulley. You can then maintain the drive unit even if the belt is fully loaded.

High speed brake to be fitted to the drive, as recommended by the learned gentlemen above

Cheers LSL Tekpro ■

Originally Posted by Graham Spriggs

............If low capacity, you should put a "high speed" holdback as an integral part of the drive's gearbox.

If high capacity, the drive would be more substantial, and the higher inertia of the drive would tend to explain the long run-on time when coasting empty.

If the holdback torque is greater than 12kN-m at the pulley, then a low speed holdback is indicated, and should be situated on the opposite side of the drive head pulley. You can then maintain the drive unit even if the belt is fully loaded. ....................

Cheers LSL Tekpro

Dear Mr.Spriggs,

At the gearbox input shaft , ( or its next shaft ) the RPM is high and the torque is low. Holdbacks fixed here are smaller , easy to handle. So replacing them are faster than the holdbacks at the drive pulley. Because at the drive pulley, RPM is less , shaft is huge, so holdback is also very, very big.

I was not knowing the limitation factor of 12kN-m for fixing the drive pulley hold back.

Regards, ■