coal double roll crusher

Rolling Ring Crushers

This Rolling Ring Crusher “hammermill” design has the capability to reduce a coal feed size of 500 mm to 25 mm in one pass. Capacities are in excess of 2 000 tph dependent upon rotor speed, percentage lump in feed, hardness, structure and moisture. The crushers are fitted with cleanout doors to remove tramp iron and uncrushable materials from the metal trap at the rear of the machine.

Construction Features

1. ROTOR

Machined from heat-treated steel to minimize deflection. Designed with an excessive safety factor for critical speed requirements.

2. FRAME

The housing is fabricated from top quality steel plate and stress relieved prior to machining.

3. BREAKER PLATE

Pre-screens undersize material through breaker grate to minimize fines production, alleviate dusting and decrease wear on crusher.

coal double roll crusher

4. ADJUSTABLE DROP CAGE

The machine is furnished with a drop cage. This feature produces absolute size control within the product range of the machine. It also permits quick cleanout in the event of a power failure and blockage.

Adjustment of the American Rolling Ring Crusher can be performed in 3 different ways:

(1) The hand wheel

(2) The hand wheel with Reduction Gearbox

(3) The motorised gearbox

Heavy-duty anti-friction bearings, which are enclosed in dust and oil tight pillow blocks. The pillow blocks are mounted and dowelled on machined surface. Split bearings are optional.

coal double roll crusher

5. LINERS

The liners consist of high impact and wear-resistant plates. The liners can be easily replaced without dismantling the machine.

6. SHREDDER RINGS

Each ring has multiple cutting edges and is reversible. The rings revolve at slow speeds and split the coal, instead of crushing it, producing a granular product with minimum fines. If rings encounter tramp metal, they are free to deflect on their shafts. The Shredder Rings can be changed either through the rear inspection panels or from the top of the machine. This may also be used to lift out the whole shaft assembly.

coal double roll crusher

Double Roll Crusher

Osborn Double Roll Crushers can be used for primary and secondary crushing. The Double Roll Crusher is generally regarded as a 4:1 feed to

product ratio crusher, however in some instances, dependent upon material friability and hardness, it is possible to achieve a 6:1 crushing ratio.

The feed material should enter the centre of the gap between the two rolls and spread across the full roll width for maximum efficiency and this ensures a uniform product size distribution.

For strict coal product specifications the Osborn Double Roll Crusher is preferred. It is important to understand the material characteristics, as the type of coal will often vary considerably. Hardness, rock content, friability and moisture content are the major factors that need to be identified, together with the crusher capacity, maximum lump size, required product size and the amount of fines that are acceptable.

Efficient crushing will lower the power requirements and increase the life of the crusher segments. When the correct crushing ratio is used and the optimum roll diameters selected, the segments will grip the feed material more efficiently and it will also not allow pieces to roll on top of the segments due to the incorrect nip angle, this assists in reducing wear.

Double Roll Crusher

Osborn Double Roll Crushers can be used for primary and secondary crushing. The Double Roll Crusher is generally regarded as a 4:1 feed to

product ratio crusher, however in some instances, dependent upon material friability and hardness, it is possible to achieve a 6:1 crushing ratio.

The feed material should enter the centre of the gap between the two rolls and spread across the full roll width for maximum efficiency and this ensures a uniform product size distribution.

For strict coal product specifications the Osborn Double Roll Crusher is preferred. It is important to understand the material characteristics, as the type of coal will often vary considerably. Hardness, rock content, friability and moisture content are the major factors that need to be identified, together with the crusher capacity, maximum lump size, required product size and the amount of fines that are acceptable.

Efficient crushing will lower the power requirements and increase the life of the crusher segments. When the correct crushing ratio is used and the optimum roll diameters selected, the segments will grip the feed material more efficiently and it will also not allow pieces to roll on top of the segments due to the incorrect nip angle, this assists in reducing wear.

Crushing rolls and drive

Each roll assembly comprises of renewable and reversible toothed segments, bolted and keyed to a robust hexagonal hub with the nuts inside the hub. Locking nuts are securely located in fabricated pockets in the drum. This enables removal and replacement of segments from the outside using only one tool (Allan Key). Bolt heads are protected from excessive wear by being counter sunk in recesses on each segment. Teeth are arranged in a staggered formation on the segments to prevent tooth on tooth impact. Tooth proportions are designed for the particular product requirements.

The rolls are separately driven by two identical motors, through sets of vee belts which are connected between the gearbox pulley and the flywheels.

The drive arrangement is free standing with the electric motors mounted on adjustable base plates.

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