MechChem Africa

In the hazardous mining environment, safety is as important as productivity. This is why one Brazilian multinational, producer of around 15% of the world’s iron, chose to install Hä̈gglunds direct drive hydraulic motors from Bosch Rexroth.

Hagglunds direct drive conveyor

Conveyors are critical to mine production, and certainly to a mine that refines around 350-million tonnes of iron ore and pellets per year. This mine was the first in Brazil to equip a belt conveyor with Hä̈gglunds hydraulic direct drive systems.
Pic Hagglunds direct drive

The Hä̈gglunds system replaced an electromechanical drive with independent electric motors, each run at a constant speed and coupled with a speed reducer. With its infinitely variable speed and inherent resistance to shock loads, the hydraulic direct drive system offered clear production advantages. But for the mining company, the strongest argument was safety.

The company had carried out a feasibility study, which highlighted potential improvements in safety and beyond. With a hydraulic direct drive on the conveyor, all rotating parts are enclosed, no temperamental couplings are required, and the hydraulic motors themselves have their own internal relief system to regulate shock torque loads. Combined, these advantage offer safer conveying with greater reliability.

A hydraulic direct drive comprising two hydraulic Hä̈gglunds CB400-320 motors, as well as a hydraulic pump unit and a Rexroth control system was installed at the mine – in only three days. “The motors were a good choice for the torque demand,” says Bosch Rexroth sales engineer, Roberto Akira Koga, “and the tight integration between our teams helped us get the solution in place quickly.”

Since installing the new drive solution, safety has indeed improved. Moreover, according to the mining company’s records, eliminating the low-speed coupling between the transmission and conveyor drive drum has done away with a good deal of maintenance.

“Maintenance is definitely lower with the direct drive solution, and the smoother, softer belt starts reduce wear and tear on the belt itself,” says Akira. “The system now absorbs any torque peaks, and it can be operated at a wide range of speeds to meet different process requirements,” he adds.
In fact, the hydraulic direct drive still has more to offer. 

Read more... Click to download the read the pdf.

BANNER 8

Contact MechChem Africa

Title: Editor
Name: Peter Middleton
Email: mechchemafrica@crown.co.za or peterm@crown.co.za
Phone: +27 11 622 4770
Fax: +27 11 615 6108

Title: Editor
Name: Glynnis Koch
Email: mechchemafrica@crown.co.za
Phone: +27 11 622 4770
Fax: +27 11 615 6108

Title: Advertising Manager
Name: Brenda Karathanasis
Email: brendak@crown.co.za
Phone: +27 11 622-4770
Fax: +27 11 615-6108

saiw logo block

sassda logo block

saiche logo block

 
Full Name*
Invalid Input

Company Name*
Invalid Input

Your Email*
Invalid Input

Phone*
Invalid Input

Postal Address 1*
Invalid Input

Postal Address 2*
Invalid Input

Postal Code*
Invalid Input

Street Address 1
Invalid Input

Street Address 2
Invalid Input

Postal Code
Invalid Input

Town / City*
Invalid Input

Country*
Invalid Input

Magazine

Invalid Input

Invalid Input