Page 26 - Schmalz - Vacuum Components

2_Kap_VT_EN_2016_VT_KAT 18.02.16 09:34 Seite 26
PA01019111_inh_EN.pdf
Vacuum Knowledge
The Vacuum System and its Components
PA01019111_inh_EN.pdf PA01019111_inh_EN.pdf

Schmalz - The Company Diameter of the suction cup
The holding force of a suction cup depends on its effective diameter. The condition of the workpiece and the number of suction cups
are also crucial for the holding force that a vacuum system can generate.

The required diameter can be determined with the aid of the following formula:
Vacuum Knowledge For horizontal pick-up: For vertical pick-up:

m x S m x S
d = 1.12 x P x n d = 1.12 x P x n x µ
U
U
Vacuum Suction Cups d = Suction cup diameter in cm m = Weight of the workpiece in kg
(with double lip ≈ internal diameter, with PU = Vacuum in bar
bellows suction cup = inner diameter of n = Number of suction cups
sealing lip)
µ = Friction coefficient
Special Grippers d S = Safety factor

Vacuum Grip- ping Systems Calculation example for horizontal pick-up: Plastic sheet: m= 50 kg

U
n =4
d = 1.12 x 50 kg x 2 Vacuum: P = -0.4 bar
Number of suction cups:
0.4 bar x 4
Measured friction coefficient: µ= 0.5
Mounting Elements A sensible selection is the suction cup PFYN 95 with a nominal diameter of 95 mm. S =2
Safety factor:
d = 8.85 cm
Vacuum Generators Calculation example for vertical pick-up: Plastic sheet: m= 50 kg

50 kg x 2 Vacuum: P = -0.4 bar
U
d = 1.12 x 0.4 bar x 4 x 0.5 Number of suction cups: n =4
Measured friction coefficient:
µ= 0.5
Valve Technology d = 12.5 cm Safety factor: S =2
A sensible selection is the suction cup PFYN 150 with a nominal diameter of 150 mm.
Switches and Monitoring

Suction rate or required volume flow [ ]
The volume flow that generates the vacuum is important for the Typical value (with smooth, air-tight surfaces) [m /h] [l/min]
Suction cup Ø
Volume flow
Suction area A
suction force. The workpiece material is the principal factor for the
3
2
Filters and Connections required volume flow. up to 60 mm 113 0.5 16.6
[cm ]
28
8.3
The table shows typical values for the volume flow or suction rate
1.0
up to 120 mm
depending on the diameter of the suction cup with smooth and up to 215 mm 363 2.0 33.3
air-tight surface. up to 450 mm 1,540 4.0 66.6
Services Important:
Conduct suction trials for porous parts.
Contact

Index of Products

26

PA01019111_inh_EN.pdf