UNIT-5-Scrapers

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SCRAPERS:

SCRAPERS Prepared by C.Makendran M.E.,(Ph.D)

SCRAPERS:

SCRAPERS Caterpillar 613C Scraper

Slide 3:

Scrapers are a type of heavy machinery used for earthmoving Self-propelled scrapers were invented in the 1930s by R.G. LeTourneau The rear part of the machine is called a hopper This hopper is lowered or raised to cut into the ground collecting the dirt The collected earth can be moved and dumped accordingly as this process is repeated Some scrapers work in tandem with a bulldozer Source: Wikipedia: http://en.wikipedia.org/wiki/Wheel_tractor-scraper Scraper Description and History

Description of Scrapers:

Description of Scrapers Features of Caterpillar Scrapers include: Semi-automatic power shift transmissions Differential Lock Cushion Hitch Quick-drop valves Elevating equipment such as uninterrupted elevator reverse and two-speed elevator Standard cubic yard capacities range from 14 yd 3 to 44 yd 3 Weight of machinery can be 67,195 lb up to 146,770 lb Source: Caterpillar Performance Handbook : Edition 24, 8-1 to 8-5

SCRAPERS:

SCRAPERS Scraper are the devices to scrap the ground to load the materials to transport to the required distance. To dump at the intended site To spread the dumped material over the required area To attain the desired thickness and to return back to do the next cycle.

Parts of scrapers:

Parts of scrapers Bowl Apron Ejector Hydraulic system

Type of scrapers:

Type of scrapers Towed type Self-propelled Self loading Tandem scraper Twin engine scraper Multi engine multi-bowl scraper

Towed Type Scrapers :

Towed Type Scrapers This type of scraper are provided with cable or hydraulic system control. Capacity(struck) - 14 m 3 to 18 m 3 Capacity(heaped) - 10 m 3 to 13 m 3 Least expensive Source: http://www.cat.com/cda/layout?m=111776&x=7

Self loaded Elevating Scrapers :

Self loaded Elevating Scrapers This is a popular and conventional type of scraper. Motorized scrapers are with high hauling speed and so very much suitable for long distance hauling.

Self loaded Elevating Scrapers:

Self loaded Elevating Scrapers Capacity(heaped) - 10 m 3 to 25 m 3 Max. Speed - 24.4 mph to 32 mph Ability to homogenize and condition soil while loading Source: http://www.cat.com/cda/layout?m=111776&x=7

Multi Engine Multi Bowl Scrapers :

Multi Engine Multi Bowl Scrapers Capacity(heaped) - 38 m 3 to 55 m 3 Max. speed - 31.1 mph to 34.1 mph Often powered by twin engines Most Expensive Source: http://www.cat.com/cda/layout?m=111776&x=7

Open Bowl Scrapers :

Open Bowl Scrapers Capacity (heaped) - 16 m 3 to 33 m 3 Max. Speed - 32 mph to 36 mph Often have push/pull ability Source: http://www.cat.com/cda/layout?m=111776&x=7

Standard Usage:

Standard Usage Loading and transporting earth over short distances (i.e. >2miles) www.terex.com/main.php?obj=prod&action=VIEW&id=21&nav=prod&cid=e3959eefdc65adcc4e0e616b833694b1

Scraper Hazards and Concerns:

Scraper Hazards and Concerns Rolling over on uneven ground and during turns, especially with full loads Failure of brakes or other machinery components Low visibility behind and around the machine Crushing and wedging in between other objects

Scraper Hazards:

Scraper Hazards Failure of safety measures such as ROPS, Reverse alerts, safety belts Poor communication among workers and operators Hazardous road conditions Dangerous maintenance situations

Thank you:

Thank you

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