Lab-04

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School

Centennial College *

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Course

226

Subject

Mechanical Engineering

Date

Jan 9, 2024

Type

pdf

Pages

7

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EQUIPMENTS: - BOTTLE JACK - VERNIER CALLIPER - MICROMETER - SCALE RULE OBSERVATION: 1. Components of the bottle jack was identified. 2. Schematic diagram of the bottle jack is now understood and drawn. 3. Measured and calculated the details of the bottle jack. - The maximum lift of the jack in lbs = 15 ton = 15 x 2000 = 30000 lbs - The bore of the lift cylinder, d1 = 1.655in - The stroke of the lift cylinder SL= 7.40in - The bore of the pump cylinder d2 = 0.465in - The stroke of the pump cylinder SP = 0.712in - The arm distance from the pivot to the pumping piston (IP)= 1.04in - The arm distance from pivot to end of lever IL=7in - The volume of the lift cylinder V1= A1 x SL A1= (π/4) x d 2 = (π/4) x 1.655 2 = 2.151in 2 SL=7.40in V1= A1 x SL = 2.151in 2 x 7.40in = 15.919in3 - The volume of the pump cylinder V2 = A2 x SP A2= (π/4) x d22 = (π/4) x 0.465 2 = 0.170in 2 SP=0.712in V2= A2 x SP = 0.170in 2 x 0.712in = 0.121 in3 The system pressure required to produce the maximum lift = Pmax = Fmax / Amax = 30000 / 2.151 = 13947.001 lbs/in 2 - The hydraulic amplification factor AH = A1 / A2 = 2.151 in 2 / 0.170in 2 = 12.653
- The mechanical amplification factor AM = IL / IP = 7 / 1.04 = 6.731 - Total Amplification Factor with lever, AT1= AH x AM = 12.653 x 6.731 = 85.167 - Total Amplification Factor without lever, AT2 = AH x IP = 12.653 x 1.04 = 13.159 - The number of strokes to achieve the maximum lift stroke, N = V1 / V2 = 15.919 / 0.121 = 131.562 = 132 strokes - Calculate the maximum lifting load [lbs.] using hand force (50 Lbs) with and without the mechanical lever. - Maximum lifting load with lever = 50 x AT1 = 50 x 85.167 =4258.367 lbs - Maximum lifting load without lever = 50 x AT2 = 50 x 13.159 = 657.950 lbs
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1. What device limits the cylinder extension? - Extension of the cylinder is controlled by orifice which is located at the upper part of the bottle jack. 2. What device allows for the cylinder retraction? - Cylinder retraction is enabled via a flow control valve at the bottom of the Cylinder. 3. Where is the reservoir? - The reservoir is surrounded the lifting cylinder where the oil required for the process is stored. 4. What methods are used for cylinder and piston sealing? - Cylinder and piston sealings are done with the help of Rubber ‘O’ Ring and metal to metal sealing. 5. Does the system have a relief valve? Explain - Yes, the orifice at the top of the bottle jack serves as a relief valve, regulating the flow and pressure of the liquid through it during the extension and retraction stoke.