Figure 8.7 Rimpull performance chart for a Caterpillar 631E scraper. Reprinted courtesy of Caterpillar, Inc. Interactive Graph Gross weight 30 40 50 60 80 100 120 160 200 lb (x1000) lb kg + + (x1000) (x1000) 15 20 30 40 50 60 70 90 kg (x1000) 150 65 120 555 100 45 35 70 25 50 50 20 40 Ej 30% 25% 20% 15 40 30 W!!! 15% 12% Rimpull 10 20 8 15 6 10 4 10% 8% 6% 5% 4% Total resistance (grade plus rolling resistance) 5 10 3% 8 2% 1 0 5 10 15 20 25 30 35 40 45 50 55 km/h 05 10 15 20 25 30 35 mph Speed 1. 1st gear torque converter drive 2. 2nd gear torque converter drive 3. 3rd gear direct drive 4. 4th gear direct drive 5. 5th gear direct drive 6. 6th gear direct drive 7. 7th gear direct drive 8. 8th gear direct drive E. Empty 43,945 kg (96,880 lb) L. Loaded 77,965 kg (171,880 lb) Table 8.1 Specifications for a Caterpillar 631E Scraper Engine: flywheel power 450 Transmission: semiautomatic power shift, eight speeds Capacity of scraper: Struck 21 cy Heaped 31 cy Weight distribution: Empty Drive axle 67% Rear axle 33% Loaded Drive axle 53% Rear axle 47% Operating weight: Empty 96,880 lb* Rated load: 75,000 lb Top speed: Loaded 33 mph *Includes coolant, lubricants, full fuel tank, rollover protective system (ROPS) canopy, and operator

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

Based on the scraper specifications in Table 8.1 and the performance charts in Figs. 8.7 and 8.8, and for haul conditions as stated here, analyze the probable scraper production. How many scrapers should be used and what will be the production in bcy per hour? The material to be hauled is cohesive. It has a swell factor of 0.77 and a unit weight of 2,940 lb/bcy. The expected rolling resistance for the well-maintained haul road is +4%. Assume a 0.85-min load time will yield an average load of 89% of heaped capacity. To account for both acceleration and deceleration, use an average speed of 5 mph over a distance of 200 ft. Use a 45-min hour efficiency factor. The total length of haul is 3,000 ft and has the following individual segments when moving from cut to fill:

600 ft 5% grade

2,200 ft 2% grade

200 ft –4% grade