All design concepts developed are based on evaluation criteria and process developed, and a final here modified to further enhance the functionality of the design. Considerations made during the design and fabrication of a single acting cylinder is as follows:
- Functionality of the design
- Manufacturability
- Economic availability. i.e. General cost of material and fabrication techniques employed
Hydraulic cylinder:
The hydraulic cylinder is mounted in inclined position. The total load acting on the cylinder consists of:
- Mass to be put on lift : 500 kg Taking FOS = 1.5 for mass in pallet 500 x 1.5 = 750 kg rounding the mass to 800kg
- Mass of top frame= 22.5 kg
- Mass of each link:5kg(5*8)=40kg
- Mass of links of cylinder mounting=4kg
- Mass of cylinder=8.150kg
- Total Mass : 22.5+40+8.150+4+800 = 874.65 kg
- Total load = 874.65x 9.81 = 8580.316N
Scissors lift calculations:
- For a scissor lift Force required to lift the load is dependent on, Angle of link with horizontal
- Mounting of cylinder on the links
- Length of link.
- Formula used Where W = Load to be lifted
- S= a2 + L2 -2aL*cos α
- S = Distance between end points of cylinder.
- L= length of link = 0.6 m
- α = angle of cylinder with horizontal.
Now the maximum force will act on the cylinder
When the cylinder is in shut down position i.e when the scissor links are closed .For calculations we will consider α=300
Thus substituting α=300 in eqn (1), We get F=8580.316N . Selecting 63mm diameter cylinder
- Area of the cylinder= force/pressure
- Area=(3.14*632 )/2 =3117.24mm2
- Pressure =(Force/Area) =(8580.316/3117.24*10-6 ) =27.52bar
