Answer Happy

Problem) Estimate the production of a single engine two-axle wheel scraper whose travel time curves are shown in the figures in the previous slides based on the following information. Maximum heaped volume = 31 LCY Maximum payload = 75000 lb - Material: Sandy clay, 3200 lb/BCY and 2650 lb/LCY Rolling resistance 100 lb/ton Job efficiency = 50 min/hr Operating conditions = average Haul road for a single pusher: Section 1. Level loading area Section 2. Down a 4% grade, 2000 ft for hauling Section 3. Level dumping area Section 4. Up a 4% grade, 2000 ft for returning
Scraper Travel Time (Loaded) feet meters 2200 7000 2000 6000 1800 1600 5000 1400 4000 1200 1000 1000-300 3000- 800 200 500 2000 600 100 400 OL 0 0 Note: CAP 6216 .25 .5 .75 DISTANCE ONE WAY 1000 0 200 0 0 5 1 1.5 2 0% 2% 3 25 TIME 3.5 4 4% 4.5 5 6% 8% 10% 12% 14% 16% TOTAL RESISTANCE (Grade plus Rolling) 5.5 minutes
Scraper Travel Time (Empty) feet meters 2200 0% 2% 4% 6% 7000 2000 6000 1800 1600 5000 1400 4000 1200 7 1000 1000 300 3000 800 200 3 500 2000 600 100 400 1000 0 0 200 0 0 0 1.5 2 2.5 Note: CAP 621G 25 .5 .75 DISTANCE ONE WAY 5 1 3 3.5 TIME 4 8% 4.5 5 10% 12% 14% 16% TOTAL RESISTANCE (Grade plus Rolling) 5.5 minutes