vacuum foam gripper calculation is important for how to know about foam pad cell force and how many vacuum foam gripper to use in vacuum handling system.
Vacuum level = -300 mbar
cell width = 11 mm
cell lenght = 13 mm
F = PA
= abs| – 300 / 100 | * 0.785 * ( 1.1 * 1.3 ) cm2
= 3.37 N/Cell
for online calculation click here...
N = number of hitting cell
W = workpiece width
w = cell width
c = overlap (2 – 8)
d = distance cell to cell
N = (W – w – ( 2 * c )) / d
= (150 – 11 – (2 * 4)) / 4.5
= 29 hitting cells
for online calculation click here...
m = workpiece weight
sf = safety factor
n = number of hitting cell
Ft = theoretical force
parallel gripper = (m * sf * 9.81) / ( n * Ft)
= ( 10 * 2 * 9.81 ) / ( 29 * 3.37)
= 2 grippers
for online calculation click here...
The main information we use is weight per surface. We look at each size and compare with weight to see if the pick-up capacity is enough. Then, we compare with the theoretical pick-up capacity of each pitch. This is why we ask for the sizes of products and their weight.
For carton box
wide = 150 mm (5.9 in)
long = 150 mm (5.9 in)
tall = 100 mm (3.94 in)
weight = 5kg (11.02 lbs).
Surface in contact with the gripper is 0.15 x 0.15 = 0.0225 m2.
Weight per m² is 222 kg/m2 (489.43 lbs/m2)
which start to be heavy.
So we need P20 mm.
If the same box is 4 kg (8.82 lbs) instead of 5 kg (11.02 lbs)
we can use P28 which is 50% less valves (lower
price) and lower turbine power.
If the same box is 3 kg (6.61 lbs)
we can use P40 which is 4 times less valves than P20 so again much cheaper
than P20 and cheaper than P28 and smaller blower required.
For small ones, it is impossible to use P40 as there will not be enough foam holes on the top of the products.
For online calculation click here...
Vacuum Technology Origin and definition of vacuum
Original of the word
Latin “vacuus” = empty / free
Definition according to DIN 28400
Vacuum is the state of a gas, whose particle-number density is lower than the one of the atmosphere on the earth‘s surface.
The state of a gas can be called as vacuum, when its air pressure is lower than the atmospheric air pressure.
Colloquial: Vacuum is matter-free space.
Technical, Physical: Vacuum specifies the State of a Fluid in a volume at a pressure, that is considerably lower than the pressure of the atmosphere at normal circumstances.
Quant physics: The state of vacuum of an element is the state where it has the smallest energy.
Evangelista Torricelli (1608 – 1647)
Student of Galileo Galilei
A brimful filled with mercury glass tube is put up-side-dow into a bowl that is filled with mercury
Notice: Silvery column falls down a little bit and
always levels off independently of the length of the tube on the same level
Above the mercury level there is free room
– the first experimentally created vacuum
Otto von Guericke (1602 – 1686)
Diplomat and mayor
Otto von Guericke places 2 hollow hemispheres out of cooper (diameter ca. 50 cm) on each other and seals the hemispheres. Afterwards he evacuates the space inside with a self-invented
piston pump. The ambient pressure presses the two hemispheres together. 16 horses (2 teams with 8 horses) weren’t able to separate the two hemispheres.
diameter 50 cm.
The sound propagation requires a material medium to devolve the sound waves.
No medium existent to carry the heat flow.
The boiling point of a fluid is reached, when the vapor pressure is equal to the external pressure
workpiece is very importance to calculate all equipment in vacuum sysytems design so we want to know basic parameter to calculate or get real weight to choose right another vacuum equipment
find dimension and density
m = L x W x H x p
m = Weight (kg)
L = Length (m)
W = Width (m)
H = Height (m)
p = Density of workpiece (kg/m3)
Example
m = 3.05 m x 0.05 m x 0.008 m x 1260 kg/m3
m = 1.54 kg
For online calculation click here...
How to defind vacuum pad, vacuum cup, suction pad, suction cup or another customer call but they use the same theory to define.
in case for define diameter for vacuum cup as below.
Force lift up and move horizantal
Load Condition - Vacuum cups direction and force direction.
Fomular :
d = 1.12 √(m * S) / (Pu * n)
d = diameter cm
m = mass kg.
S = safety factor
Pu = vacuum level bar
n = number of vacuum cup
Workpiece turn 90 degree or turn over workpiece
Load Condition - Vacuum cups direction and force direction.
Fomular :
d = 1.12 √(m * S) / (Pu * n * u)
d = diameter cm
m = mass kg.
S = safety factor
Pu = vacuum level bar
n = number of vacuum cup
u = coefficiency factor
We want to use vacuum cup for metal sheet and use 1.5 bellow vacuum cup
Metal sheet m = 50 kg.
vacuum level Pu = – 0.4 bar
number of vacuum cup n = 4
Coefficiency u = 0.5
Safety factor S = 2
Use Formular
d = 1.12 √(m * S) / (Pu * n * u)
d = 1.12 √(50 * 2) / (0.4 * 4 * 0.5)
d = 12.5 mm
d = 125 mm
For online calculation click here...
for final choose vacuum cup we can choose
for another principle we should select type of material for suiable to use with our application in picture is vacuum cup in PU they are suitable for wear resistanc and long life to you with stamping or press shop application in automotive industry.
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