How does a dragline work?
Dragline buckets are enormous machines that can move many tons of dirt, rock, and overburden. The system consists of a large bucket suspended from a boom that is moved by the pulley system. The ropes are powered by a strong motor and have two main parts. The hoisting rope, which hoists the bucket from the boom.
How fast does a dragline move?
Draglines are not designed to cover such a great distance, but are fitted with a propulsion mechanism that allows them to ‘walk’ slowly. So slowly, however, that travelling to the new site at a speed of just 0.1 to 0.2 kilometers per hour would mean the dragline would be out of operation for months.
How does a drag line move?
In all but the smallest of draglines, movement is accomplished by “walking” using feet or pontoons, as caterpillar tracks place too much pressure on the ground, and have great difficulty under the immense weight of the dragline.
How long does dragline take to complete one cycle?
Almost all walking draglines take a step of approximately 2 m within a time period of 0.75-1 min.
What is dragline operator?
A dragline operator’s main responsibility is to manage the levers that control the dragline excavator. You use controls to lower the bucket down to the ground and then drag it along in a straight path to gather materials. You’re also responsible for emptying the bucket of its materials in a dump operation.
How deep can a dragline dig?
Dragline Excavators Pros: Dragline excavators have a digging depth of 65 meters (213 feet) or more. Cons: Its large size and inflexible system make it only useable for specific jobs. The dragline excavator is larger than the standard. More importantly, it operates differently.
How much does a dragline bucket hold?
This new 8750 will weigh more than 6800 tonnes (15 million pounds) and will carry a 106 cubic metre (139 cubic yard) struck capacity bucket. With a rated suspended load capacity of 324,322kg (715,000lbs), the dragline will be one of the largest draglines operating in the world today.
What is the maximum gradient for dragline?
Even thinner seams with a limiting gradient of 1 in 6 to 1 in 8 are now considered to be mineable by draglines. A dragline may be considered as one of the world’s biggest robots which is about 100 m high and is used as a walking crane in surface coal mines.
What is a shoe on a dragline?
Draglines have the ability to walk slowly (generally using ‘shoes’ which lift the machine while moving it’s tub) and are generally used in strip-mining operations to move large volumes of overburden from a pit to a spoil pile directly adjacent or behind the machine.
What is the power range of dragline?
Typically draglines are in the range of 60 – 150 yd.
What is a dragline oiler?
About the Job Reporting to the Dragline Supervisor, Dragline Oilers provide support to Pit Operations by assisting with all tasks associated with dragline operation and maintenance. (Management reserves the right to add, subtract, or modify the responsibilities and qualifications at any time).
How heavy is a dragline?
Specifications for 9020XPC
| Net weight | 16,606 lbs. |
|---|---|
| Counter weight | 968 lbs. |
| Working weight* | 17,574 lbs. |
Where is the largest dragline in the world?
The Cat 8750 is equipped with the world’s longest boom measuring up to 132.5m (435ft) and has a suspended load capacity of up to 383,286kg. The dragline is AC-powered and has been operational at TransAlta’s Highvale coal mine in Alberta, Canada, since 2010.
What is a dragline base?
Looking something like a. UFO, the “base” is the section of the dragline that sits on the. ground and bears the weight of the massive 3000 tonne struc- ture spinning around on top of it. Hofmann Engineering also provided the massive slew bearings.
What is a dog drag line?
The term “drag line” refers to a simple leash that you or your dog trainer places on the puppy. Yet instead of holding the leash and walking the dog, the puppy is allowed to run around your home with the leash on the ground. Your puppy runs around dragging the “line” behind it.
How much can a dragline bucket hold?
What is board and pillar method?
A system of mining in which the distinguishing feature is the winning of less than 50% coal on the first working. It is more an extension of the development work than mining. The second working is similar in principle to top slicing.
How does the dragline operation work?
Each major step of the dragline operation is simulated and the material is excavated and dumped to bench or final spoil. As the operation proceeds all volumes (prime and rehandle) as well is an animation of the operation are recorded.
What is dragline excavator?
Dragline Excavator. Dragline falls in heavy equipment’s category. Dragline excavator is used for civil engineering projects and surface mining. Dragline is the largest equipment ever built on this planet.
How many types of dragline are there?
There are three types of dragline; Wheel mounted dragline Crawler type dragline Truck mounted dragline/portable dragline.
How does topography affect the performance of a dragline?
If the dragline swings close to a high spoil pile, the topography may force the bucket trajectory closer to the boom, increasing the hoist force and slowing the hoist system. The figure below illustrates the carry envelope.