Datasheet

B. Shear Force and Moment Applied to Vacuum Pad
• Vacuum pads are not resistant to shear force (parallel force with adsorption surface) and moment.
• Minimise the moment applied to the vacuum pad with the position of the workpiece centre of gravity in mind.
• The acceleration rate of the movement must be as small as possible, and make sure to take into consideration the wind
pressure and impact. If measures to slow down the acceleration rate are introduced, safety to prevent the workpiece from
dropping will improve.
• Avoid lifting the workpiece by adsorbing the vertical side with a vacuum pad (vertical lifting) if possible. When it is
unavoidable, a sufficient safety factor must be secured.
To lift a workpiece vertically, make sure to take into consideration the acceleration rate, wind pressure, impact, etc., in addition to the mass
of the workpiece. (Refer to Fig. 1)
Because the pads are susceptible to moments, mount the pad so as not to allow the workpiece to create a moment. (Refer to Fig. 2)
When a workpiece that is suspended horizontally is moved laterally, the workpiece could shift depending on the extent of the acceleration
rate or the size of the friction coefficient between the pad and the workpiece. Therefore, the acceleration rate of the lateral movement must
be t. (Refer to Fig. 3)
Lifting Force, Moment, Horizontal Force
Loading by acceleration and wind
pressure lifting
Pad positioning Caution for friction force between pad and
workpiece
Fig.
1
Fig.
2
Fig.
3
Pad
Lifting direction
Pad
Pad
Pad
Guide
Make sure that the pad's suction surface is not larger than the surface of the workpiece to prevent vacuum leakage and unstable picking.
Balance of Pad and Work
As a rule, the unit must be installed horizontally. Although a diagonal or a vertical installation should be avoided whenever possible, if the
unit must be installed in such a manner, be certain to provide a guide to guarantee absolute safety.
Mounting Position
If multiple pads are used for transferring a flat object with a large surface area, properly allocate the pads to maintain balance. Also make
sure that the pads are aligned properly to prevent them from becoming disengaged along the edges.
Provide an auxiliary device (example: a guide for preventing the workpieces from dropping) if necessary.
Caution
Guide for drop prevention
Pad
Caution
Guide for drop prevention
Pad
Pad
Horizontal lifting Vertical lifting
Model Selection
Front matter 12