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Doc. No. ZQ-OM01301-A
- 40 -
No.
Countermeasures
(11)
When the ejector adsorbs the workpiece by generating a vacuum, high speed air coming out of the
nozzle collides into the diffuser I.D. and bounces back, generating vibration in the exhaust air. Because
of this, the vacuum pressure fluctuates slightly and is not stabilized.
The workpiece can be adsorbed when the ejector is used in this condition. The phenomenon causes
noise or could be a problem related to the setting of the vacuum switch. The noise can be eliminated
by changing the supply pressure.
Adjust the pressure regulating valve for supply pressure while checking the exhaust noise and vacuum
pressure until the noise disappears.
Ejector may generate noise due to the increase of exhaust resistance. When the silencer becomes
dirty, replacement of the silencer element may improve the condition.
(12)
In case of centralized piping, the exhausted air flows back into the ejector exhaust path which is not
operating, and is then exhausted from the vacuum port. In the case of a centralized manifold exhaust,
air flow from the vacuum port can be reduced by selecting a product with a check valve. It is possible
to order a single check valve.
(13)
Release air is not output if the vacuum release flow adjusting needle is fully closed. Adjust the needle
to an appropriate position.
(14)
If oil mist enters the product, the grease of the valve assembly and main valve is washed away with
the mist, adversely affecting the valve operation. In addition, the life of the main valve may be shortened.
Install the mist separator and air filter to the supply air piping for the ejector.
(15)
The vacuum pad surface in contact with the workpiece deteriorates according to the number of contacts.
The workpiece may not be contacted correctly if the surface is deteriorated due to the increase of the
rubber viscosity. If the rubber viscosity increases, replace the pad.
(16)
The product with an energy saving switch reduces air consumption by stopping air supply by creating
a vacuum between the check valve and pad in the ejector while adsorbing the workpiece. When the
holding vacuum pressure decreases, the supply valve turns on at the previously set threshold to supply
vacuum pressure so that the workpiece does not fall.
Therefore, if the holding time is very short, turning it ON/OFF at a high frequency will cause a
phenomenon like chattering. In this case, eliminate the leakage or cancel the energy saving setting. For
how to release the setting, refer to the manual for the digital pressure switch for the vacuum ejector with
energy saving function (ZQ-ZSV
□□□□
-A).