Drag Line Excavators

January 3rd, 2009 | Tags:

For use with surface mining, civil engineering and various excavation jobs, a drag line excavator comes in very handy and there are various sizes of the machine to use in different tasks. Civil engineering may call for slightly smaller versions for port construction and the building of roads. Mining operations tend to use the larger drag line excavators for the extraction of coal and these particular versions are on the heavier end of the scale, some weighting as much as 10,000 tons!

The drag line excavator requires a bucket system that involves a suspension of the bucket from a boom and this boom is then moved by a system of ropes and chains. The bucket and hoist coupler which is assembled from the boom is generally powered by the hoisting rope which in turn uses diesel or electric motors and then from this, the drag rope will be able to move the bucket so that it is horizontally moved. Dependant on the skill that the operator has, the bucket itself can be moved in various different directions and ways to complete a great number of tasks.

Drag Line Excavators Operations

The bucket on a drag line excavator will generally be positioned so that is high above the material in which it needs to excavate through and then lowered so that it performs a dragging motion. Once the bucket has excavated the material or some of the material, the hoisting rope will be used to further lift the bucket itself and then move so that the materials within the bucket can be dropped in its designated place. This dropping motion is known as dump operation and the bucket itself uses the drag rope to perform this dumping motion.

Limitations of the Drag Line Excavator

The boom length and height will set the limitations of this type of machinery. This basically sets limits on where the materials can be dumped once they have been excavated and they are known to be rather useless when it comes to loading up rather largely piled materials.

Despite the limitations that may be in place with this excavator, they are rather popular with mining operations and one of the main reasons behind this is the fact that they are low in cost, high in reliability and also come with low waste removal costs.

There are also various differing cutting sequences to drag line excavators and there is the side casting method, which is pretty self-explanatory – throwing the unwanted materials to one side. There is also the key pass sequence and this may be joined by the chopping pass. The blocks pass is the slowest of all of the cutting sequences but despite the fact that it is the slowest, it has the ability to move great loads of material with ease.

For any mining task, construction job or excavation task, the drag line excavator is one of the best and also the most useful of all equipment. The biggest piles of materials can be moved which makes them perfect for large and deep holes within the ground and aside from many other benefits; they can complete a task with ease.

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