Pneumatic valve for cartesian robot

[Jake Platt]

Hello,

I am trying to build a high-speed X/Y cartesian robot which vacuums up defected parts from a moving conveyor. The end effector of the robot has a venturi vacuum integrated. Because the vacuum is constant, I need a Z-axis to go up/down for the end effector to get the defects otherwise it sucks up everthing. This is very slow. I would rather keep the height constant of the end effector and instead toggle the vacuum on/off using a valve of some kind so I can eliminate the z axis. I can't seem to find what I'm looking for because valves I've found are for small diameters (10mm). I need a valve for hoses about the size of ping-pong balls. Can anyone suggest a source for a pneumatic valve in the size range and that can cycle in very high speeds?

Thank you,
Jake Platt

 

[berkeman]

Hello,

I am trying to build a high-speed X/Y cartesian robot which vacuums up defected parts from a moving conveyor. The end effector of the robot has a venturi vacuum integrated. Because the vacuum is constant, I need a Z-axis to go up/down for the end effector to get the defects otherwise it sucks up everthing. This is very slow. I would rather keep the height constant of the end effector and instead toggle the vacuum on/off using a valve of some kind so I can eliminate the z axis. I can't seem to find what I'm looking for because valves I've found are for small diameters (10mm). I need a valve for hoses about the size of ping-pong balls. Can anyone suggest a source for a pneumatic valve in the size range and that can cycle in very high speeds?

Thank you,
Jake Platt

Interesting. Can you instead just open several small holes in the hose some distance upstream to spoil the vacuum at the end?

 

[Jake Platt]

I misunderstood your point for 2 months. I was re-reading old posts and now i finally get your point. Clever! It never dawned on me to the leave the vacuum intact and just cancel the pressure.