Design the hoist system of mining dump truck. Here is the key information. Rated payload 360 Metric

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Design the hoist system of mining dump truck. Here is the key information.

Rated payload 360 Metric Ton

Weight of the body 45,000 kg

Pump Flow 1200 LPM

Relief valve setting 24,200 kPa

Body raise time 25 second

Stroke length 1000 mm

Number of Cylinders 2

Develop a hydraulic circuit with an appropriate direction control valve to perform the following operations. Use a solenoid-operated and spring-centred direction control valve.

a) Raise the body

b) Hold the body in any position

c) Float the body to lower it under gravity

d) Lower the body using hydraulic pressure

e) Calculate the piston diameter using total load (payload plus body weight) and pressure relief valve setting. Assume that maximum payload is 110% of rated payload and body weight can vary by +/-10 % due to plate thickness variation and welding size variation

f) Calculate rod diameter assuming that both ends are pivoted and guided. Use factor of safety 3.5, and E = 2.1 X 1011 N/m2 .

g) Determine the line sizes for the suction, supply, and return lines using the following maximum velocity guidelines:

i. Suction: 1.5 m/sec

ii. Return: 4.5 m/sec

iii. High Pressure: 7.5 m/sec