Question

Given the following:

Bucket volume of loader: 3.6 L m³ (loose cubic meters)

Loader cycle: 0.42 min

Truck capacity: 11.5 L m³

Truck traveling time with load 2.28 min

Truck maneuvering for tipping and tipping time 0.65 min

Truck return time 1.18 min

Truck maneuvering for loading 0.40 min

Planned activities (lunch, breaks etc…) 0.64 min

Waiting time at loader (per cycle) 0.50 min

Conversation with supervisor (per cycle) 0.25 min

Other cycle time affecting machine performance 0.75 min

Swell factor 1.12

Bank Density 1,930 kg/m³ (in situ)

And the following equation:

P = (Q x T) / t

Where

P = Performance /hr (tonnes/hr)

Q = Loaded(shovel/loader) Capacity of truck (tonnes)

T = Productive time in minutes/hour

t = round trip cycle time (i.e. excluding unavoidable delays)

Calculate

1. Number of buckets required to fill the truck (use nearest integer)
2. The loading time of the truck. (Assuming 0.1 min to load the first bucket)
3. The total unavoidable delay time per cycle .(i.e. Planned activities + Waiting time at loader + Conversation with supervisor + Other cycle time affecting machine performance)
4. The round trip cycle time “t” ( See definition of “t” above)
5. The productive time per hour (.i.e. time minus delays)
6. The tonnage hauled per cycle
7. The performance per hour

Answer 1

HELLO THERE, WARM GREETINGS.

LET US LOOK INTO THE SOLUTION DIRECTLY.

ANSWER MAY DIFFER DEPENDING UPON THE CHOICE OF EFFICIENCY OF TRUCK AS SOMEONE WHO CHOOSES 3 CYCLES OF LOADER WILL REPORT LESS HAULING EFFICIENCY IF TRUCK AND LESSER ROUND TRIP CYCLE TIME OF TRUCK BUT THAT WILL HAVE MORE OR LESS SAME IMPACT ON PRODUCTION AS THAT OF OUR ASSUMPTION OF MAX EFFICIENCY OF TRUCK AND A SLIGHTLY HIGHER TIME OF ROUND CYCLE TRIP AND LOADING.  

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