FRONT END LOADER These loaders are a popular addition to tractors from 50 to 200 hp. A loader (also known as: bucket loader, front loader, front endloader, payloader, scoop loader, shovel, skip loader, and/or wheelloader) is a type of tractor, usually wheeled, sometimes on tracks, thathas a front mounted square wide bucket connected to the end of twobooms (arms) to scoop up loose material from the ground, such asdirt, sand or gravel, and move it from one place to another withoutpushing the material across the A loader is commonly used to move a stockpiled material fromground level and deposit it into an awaiting dump truck or into an opentrench excavation. The loader assembly may be a removable attachment orpermanently mounted. Often the bucket can be replaced with otherdevices or tools—for example, many can mount forks to lift heavypallets or shipping containers, and a hydraulically-opening "clamshell"bucket allows a loader to act as a light dozer or scraper. ISN
SCRAPER• excavation cum transport equipment• suitable for soft material• generally used for top soil removal• Diesel operated with pneumatic tyre wheels• a bowl fitted with a cuttingISN blade at the bottom.
OPERATION OF SCRAPERA scraper is pushed forward by a DozerIt’s blade cuts a thin slice of a earth usually between 100 mm to 250mm thick over a distance of nearly 30 m.The earth is automatically collected in the bowl located at the centreof the machine.The bowl capacity ranges from 5 cum to 20 cum and takes nearly halfto one minute for loading.When the scraper is fully loaded its bottom opening is closed througha table operated by the operator.At the dumping yard as the Scraper moves, the bottom opening ofbowl is opened, and the contentsISN earth are unloaded in the layer of150 mm to 250 mm thick over a distance of 30 to 50 m.
OPERATION OF DOZER It is the vital equipment in Open cast mining. tractor with a pusher blade attached to the front portion. Diesel operated with crawler chain (some times tyre mountedDozers also used) the pusher blade can be raised lowered or tilted through smallangles horizontally by rams operated by hydraulic pressure. The Dozer blade is used for pushing loose material, digging earth,soft weathered rock, for pushing scrapers, for levelling / grading andcompacting the ground, for laying haul roads, for toeing dumpers etc.,for pushing boulders trees etc., There is different capacity of Dozers ranging from 100HP to 800HP and normally used are 400 HP, which costs app. 1.2 Cr. ISN
WHEEL DOZER tractors outfitted with dozer blades or push blocks. used as push tractors in scraper applications. Though these machines can be converted from wheelloaders by replacing the loader’s bucket with a dozer blade,this configuration is only successful for light-duty tasks. Used for clearing and grading land, wheel dozers arefrequently used in mining applications and reclamation jobs. The wheel dozers’ advantage over crawler dozers is theirability to move quickly. Additionally, they can travel between multiple job siteswithout damaging paved roads. ISN
RIPPER DOZER tractors outfitted with dozer blades or push blocks. A Dozer equipped with fork like attachment is known as“Ripper” can be mounted either with one or two rippers operates like a plough to loosen moderately hard rock can be also used to extract thin seams where thethickness is less than 1.2 m where blasting is not effectivelydone. It rippes the thin seams and later can be loaded by theShovel & Dumper combination. There are other crane attachments for the Dozer which isknown as pipe layer for transporting pumps, pipes andlaying pipes. ISN
MOTOR GRADER tractors outfitted with dozer blades or push blocks. This is a machine used for levelling the road surface bysmoothening out the ups and downs and for casting asidethe boulders on the road. It is always pneumatic tyre operated with rear wheelsdrive. The grading blade is attached to a circle that is hung fromthe overhead frame and pulled by a drawbar fastened to thefront of the frame. The blade is usually 3 to 4m long having replaceableedges on the sides and bottom. The approximate cost of a medium size Motor Grader willbe Rs 60 Lakhs. This is essential equipment in Opencast mining for ISNcontinuous maintenance of haul roads.