Bearings for copper and gold mining: solutions for mills and crushers

In copper and gold mining, spherical roller bearings are the standard choice for mill and crusher shafts. Their design with two rows of rollers and a spherical outer ring allows them to support combined radial and axial loads, as well as compensate for shaft misalignment or structural deformations. This is key in heavy equipment that operates with constant vibrations and impacts.

We stock a wide range of spherical roller bearings, with over 3700 references available. For example, codes like 22325 and 22361 from SKF, or 20222-MB and 20240-MB from FAG, cover the needs of large equipment. We also work with brands like LINK-BELT, with models such as 6203U and 22318, ideal for specific applications.

When choosing a bearing for mining, it is essential to consider the type of load, speed and lubrication conditions. Spherical roller bearings with machined cage (MB suffix) offer greater robustness for impact loads, while standard designs are suitable for moderate loads. If you have doubts, we advise you to select the correct reference.

Split housings (also called pillow blocks) are the base for mounting spherical roller bearings in mining applications. Their design split into two halves allows inspection and replacement of the bearing without dismounting the shaft, reducing downtime. In mining, where every hour of production counts, this advantage is decisive.

We work with SKF SAF and SNL series housings, with over 100 references each. For example, SAF 322 and SAF 520 are suitable for large diameter shafts in mills, while SNL 211 and SNL 216 cover smaller applications in crushers or conveyors. These housings are designed to be mounted on rigid bases and aligned accurately.

In addition to housings, we supply covers and accessories to complete the assembly. We have over 900 references, including locking covers, retaining rings and seals. For example, SKF covers TS 34 and TS 52, or TIMKEN LO519 and VR317, ensure a hermetic seal and protect the bearing from contaminants.

Couplings are critical components to connect motors, gearboxes and shafts of mills and crushers. In mining, they must absorb misalignments, dampen vibrations and transmit high torques without failing. An inadequate coupling can cause unplanned stops and damage to bearings.

We supply a variety of flexible and rigid couplings, with over 1400 references available. Although we do not list specific codes in this entry, we work with recognized brands and can quote the appropriate coupling according to the power and type of equipment. We only need the shaft dimensions and operating conditions.

When selecting a coupling for mining, consider factors such as nominal torque, rotation speed and misalignment capacity. Grid or elastomer couplings are common in mills due to their ability to absorb impacts. We advise you to choose the most reliable option for your application.

In addition to the main components, in a mining plant there are numerous auxiliary systems that require roller chains and pulleys. From vibrating feeders to conveyor belts, these elements must withstand abrasive environments and variable loads.

We work with high-strength roller chains, with over 2200 references. They are ideal for power transmission in equipment such as screens, sand washers or lifting systems. We also supply V-belt pulleys, with over 3000 references, to drive pumps, fans and other auxiliary equipment.

In mining, it is common for these components to suffer premature wear due to dust and vibration. Therefore, we recommend selecting chains with surface treatment and dynamically balanced pulleys. If you need to replace a chain or pulley, send us the size or code and we will quote the appropriate alternative.

Predictive maintenance is essential in mining to avoid catastrophic failures. Monitoring bearing temperature and vibration allows detecting problems before they cause stops. Spherical roller bearings, being self-aligning, tolerate some misalignment, but an excess can reduce their service life.

When selecting a bearing for mills or crushers, consider the internal clearance (for example, C3 to compensate for thermal expansions) and the type of sealing. In dusty environments, bearings with seals or shields are recommended, or the use of housings with hermetic covers.

Lubrication is also important: in mining, high-viscosity greases with extreme pressure additives are often used. An adequate lubrication plan, together with correct mounting, can double the bearing life. If you need advice, tell us your application and we will recommend the best configuration.

Spherical roller bearings offer unique advantages for copper and gold mining. Their self-aligning capability compensates for shaft deflections and mounting imperfections, common in heavy equipment. They also support combined loads and are resistant to impacts, making them ideal for mills and crushers.

Compared to other types of bearings, spherical roller bearings have higher load capacity for the same shaft size. This allows designing more compact equipment or increasing production capacity without changing dimensions. Therefore, they are the preferred choice of mining equipment manufacturers.

At MR Accesorios Industriales, located in Buenos Aires, Argentina, we work with the main brands of bearings and transmission components. If you are looking for bearings for your mining operation, we quote the exact reference or an equivalent alternative. We only need the code, size or a photo of the part.

Below, we answer some common questions we receive from maintenance managers and buyers in the mining sector. If you have a specific query, do not hesitate to write to us.

What bearing is used in a ball mill? Generally, spherical roller bearings mounted on split housings, such as those of the SAF or SNL series, are used. The exact choice depends on the mill size and the loads involved.

Can you supply bearings for jaw crushers? Yes, we work with spherical roller bearings and other types suitable for crushers. Send us the code or dimensions and we will quote the appropriate option.