21.Track-Type Tractors Dozing
Determine average hourly production of a D8N/8SU (Hydraulic with tilt
cylinder) coal, an average distance of 400m down a 15% grade, using a slot dozing technique. Estimated material weight is 1600 kg/Lm3. Material density =1392 kg/Lm3. Operator is average. Job efficiency is 50 min/hr (check the notes for production curve, table for correction factors).
Uncorrected maximum production 458 Lm3/hr
22.Track-Type Tractors Ripping
Determine the loosening costs in the following situation: Machine D11R Tractor with No. 11 single shank ripper in coal Rip spacing 1600mm
Ripper penetration 500mm Rip distance 150m
Rip time 4.32 minutes Manoeuvre time 0.35 minutes
Seismic velocity 2500 m/s (assume this is a realistic value for coal, graphs available to check).
Working rate per hour $ 120
What is the effect of the seismic velocity of rock on dozer ripping operations?
23.Motor Grader
A Motor grader will travel at an average speed of 10km/hr along a haul road to clear the shoulder for a distance of 20km on one side. It is expected that proper clearing will require three passes, and that the machine has the usual efficiency factor of 0.6. Calculate the production expected from this grader performing this task.
24.Dragline
Rated Capacity of a Dragline Bucket
Calculate the rated capacity of a dragline bucket, given the following information:
Height at front = 2m
Height at rear = 2.25m
Length at top = 5.9m
Length at bottom = 5.4m
Width of front top = 3m
Width of rear top = 3m
Width of front base = 3m
Width of rear base = 3m
Factor for capacity loss due to bucket design = 0.20
25.Wheel Loader
Application Dozer pile less than 3m high dump to hopper
Production Required Material
Density
232.05 metric ton per hour poorly fragmented rock
1700kg/m3
Loading is constant with a hard level surface for loader manoeuvring. Show calculations and procedure to select an appropriate loader for this task.