Calculating Loader Capacity and Fleet Size Mining Assignment

Assignment Task

Problem

To meet the production target of mining operation, ore hauling activity should deliver 70,000 tonnes/shift (7 hours/shift) from mining pit located 3 km away from the Plant. You are asked to find the fleet needed with this following information:

1. What is the loader capacity (tons) per cycle, based on the data given above?
2. How many load cycles can the loader perform in one shift considering the scheduling limitations mentioned in the problem statement?
3. What is the total load a loader can haul in one shift? (Assuming MF=1)
4. How many loaders are required to achieve the target?
5. How many scoops of loader can the truck haul safely? (Hint: Round off to minimum number of scoops. You may need to perform 2 calculations. Think.)
6. What is the highest obtainable speed range, maximum speed and the Rimpull?
7. If the loader’s bucket rise time is 8 second, how much mechanical work is done per bucket rise of 5 meters, what is the power requirement and what hydraulic pressure is required by

the actuator to provide the power if the available flow rate is 100 gal/min? (Provide answers in SI Units)

1. CO2 emission and diesel fuel consumption in one shift for the Consider maximum values of the provided range in the lecture notes and heavily loaded equipment.

Knowledge Base (Explain why should the Usable Rimpull be greater than Required Rimpull?

1. Explain what happens in the field if the MF > 1 and MF<1>
2. Explain why derating is applied on high altitude?
3. List down 3-5 reasons why underground loading and hauling equipment are different from surface mining applications?
4. Despite numerous benefits of autonomous haulage system, very few mines are fully Where do you think the bottlenecks are? (Explain your thoughts clearly. No need to state facts from scientific studies).

Problem

The material produced at a mine has been found to have a greater density than originally thought. To make sure that the conveyor is still operating safely, perform the following checks:

1. What is the throughput in ????????ℎ?
2. Find ????₁, ????₂ and ????_????????????.
3. What is the counterweight required?
4. What is the belt strength required?
5. Is a 125 ???????? electric motor still sufficient or is an upscale necessary?
6. Will the new rock density require a backstop installed?

Table 1. Values of different parameters for Problem 1

Notes

• The loading point is lower in elevation than the unloading
• Assume availability, utilization and mechanical efficiency is 100%.

Problem 

A 6-ply, fixed belt conveys coal having a density of 0.85 ????????????????????/????³. The belt has a width of 30 ????????????ℎ???????? (76 ????????) and runs a distance of 500 ????. Coal is loaded at two points as shown in the Figure 1.

• Verify that the speed of the belt does not exceed the maximum recommended speed of 2 ????/????. Assume ???? = ????2/12.
• If it was decided to run the belt at a speed of 75 ????/????, calculate the required motor power in kW using the following data:
• Length factor ????_???? = 45 ????,
• Idler coefficient of friction, ????_???? = 03
• Belt motor efficiency = 90%

* Assume ????_???? = 60 ????

• It was decided to use a 2-drum drive giving a total angle of wrap of 360°. Calculate the maximum belt stress in ????????/????/????????????. The coefficient of adhesion between the belt cover and the steel drum is 25.
• If the spacing between idlers is 3 ???? and 2.6 ???? on the loaded and empty runs, respectively, calculate the minimum tension required so that the belt sag does not exceed 1.5% on the loaded run and 3% on the return. Assume the belt material weighs 24 ????????/????².

Knowledge Base

1. Why is sagging of more than 2% not desirable?
2. In the Goodyear formula:
   1. What does the effective tension represent physically?
   2. Additional resistance can be added through the Friction Factor and the Length What is the difference between what they represent?
3. What are the design considerations in selecting belt specifications?

4. What are the ways to increase the belt tension ratio?
5. Why is a thin film of rubber left on the cables when the belt ends are prepared for a splice in a steel cable belt?

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