Datasheet

Vacuum adsorption system as a method to hold a workpiece has the following features.
• Easy construction
• Compatible with any place where adsorption is possible.
• No need for accurate positioning
• Compatible with soft and easily-deformed workpieces
However, special care is required in the following conditions.
• Workpiece may drop under certain conditions since it is transferred being adsorbed.
• Liquid or foreign matter around the workpiece may be sucked into the equipment.
• Large adsorption area is necessary to get large gripping force.
• Vacuum pad (rubber) may deteriorate.
Fully understand the features above and select the equipment that suits your operating conditions.
 Vacuum Pad Selection Procedures
1) Fully taking into account the balance of a workpiece, identify the adsorption positioning, number of pads and applicable pad
diameter (or pad area).
2) Find the theoretical lifting force from the identified adsorption area (pad area x number of pads) and vacuum pressure, and
then find the lifting force considering actual lifting and safety factor of transfer condition.
3) Determine a pad diameter (or pad area) that is sufficient to ensure the lifting force is greater than the workpiece mass.
4) Determine the pad type and materials, and the necessity of buffer based on the operating environment, and the workpiece
shape and materials.
The above shows selection procedures for general vacuum pads; thus, they will not be applicable for all pads. Customers are
required to conduct a test on their own and to select applicable adsorption conditions and pads based on the test results.
 Points for Selecting Vacuum Pads
A. Theoretical Lifting Force
• The theoretical lifting force is determined by vacuum pressure and contact area of the vacuum pad.
• Since the theoretical lifting force is the value measured at the static state, the safety factor responding to the actual
operating conditions must be estimated in the actual operation.
• It is not necessarily true that higher vacuum pressure is better. Extremely high vacuum pressure may cause problems.
• When the vacuum pressure is unnecessarily high, pads are likely to be worn out quickly and cracked, which makes the
pad service life shorter.
Doubling the vacuum pressure makes the theoretical lifting force double, while to doubling the pad diameter makes the
theoretical lifting force quadruple.
• When the vacuum pressure (set pressure) is high, it makes not only response time longer, but also the necessary energy
to generate a vacuum larger.
Example) Theoretical lifting force = Pressure x Area
Pad diameter
Area (cm
2
)
Vacuum pressure
[40-kPa]
Vacuum pressure
[80-kPa]
ø20
ø40
3.14
12.56
Theoretical lifting force
12.56 N
Theoretical lifting force
50.23 N
Theoretical lifting force
25.11 N
Theoretical lifting force
100.45 N
4 times
2 times
Features of Vacuum Adsorption
1
Vacuum Pad Selection
2
Model Selection
Front matter 11