EXAIR’s compressed air powered E-Vac single stage vacuum generators are a low cost way create vacuum for many operations including- pick and place, clamping, chucking, alignment, lifting, and many others.
The E-Vac provide instantaneous response and are commonly used for pick and place operations.
How to Build An E-Vac System:
Step 1 – Select E-Vac type:
A – Determine if the part to be lifted is porous (Example, cardboard) or non-porous (Example, plastic sheet)
- Porous materials require a low vacuum generator which produces a lower vacuum in exchange for higher vacuum flow which is capable of maintaining a good vacuum level through material that aloows air to flow through itself.
- Non-Porous materials are best suited to use the high vacuum generator which is capable of producing more powerful vacuum for the application.
B – Select a style of E-Vac – In-Line Low Vacuum, In-Line High Vacuum, or Adjustable
- Porous – low vacuum generator, max vacuum = 21″ Hg (71 kPa)
- Non-Porous – high vacuum generator, max vacuum = 27″ Hg (91 kPa)
- Adjustable – max vacuum = 25″ Hg (85 kPa)
Step 2 – Find the weight of the part to be lifted:
Step 3 – Multiply the weight by a vacuum cup safety factor (2 for a horizontal vacuum cup position, and 4 for a sideways vacuum cup position)
Step 4 – Determine the number of cups needed, considering the following:
A – How many cups are needed to evenly distribute the weight for stable lifting and placement.
B – What is the weight that each vacuum cup can lift based on maximum vacuum available?
C – Select the appropriate vacuum cup from the different styles available.
Step 5 – Choose the E-Vac model, considering the entire vacuum system from the E-vac to the part:
A – Number of vacuum cups per E-Vac.
B – Length and size of the vacuum tubing.
C – Vacuum cup size and type.
- The volume of air to evacuate from your vacuum system and the vacuum flow of the E-Vac selected will determine the time it takes to build the lifting vacuum level.
- A lower volume of air in the system and/or higher capacity (SCFM/SLPM) E-Vac will result in faster pick-up times.
- It is difficult to calculate an exact pick-up time.
Example – Sheet of material 3′ x 3′ (0.91m x 0.91 m) that weighs 25 lbs. (11.3 kg). Each sheet is in stack and will be placed on a conveyor.
As you can see, there is a lot to consider when building an E-Vac system. Feel free to contact us and we can help go through the steps.
If you have questions about E-Vacs or any of the 15 different EXAIR Intelligent Compressed Air® Product lines, feel free to contact EXAIR and myself or any of our Application Engineers can help you determine the best solution.