Troubleshooting Guide: QVC-1 Pneumatic Vacuum Loader

If failed feeding or short feeding capacity occurs on the QVC-1 vacuum feeder, please check the feeder as the following procedure:

1. Check if the pressure of the supplied air reaches 0.5—0.6Mpa or not. The pressure of the supplied air refers to the air pressure in the system when the vacuum generator works.
2. Check if the discharge is airtight.
   • After long-term operation, a certain thick powder is deposited on the discharge, resulting lax discharge and vacuum leakage. If the discharge is not airtight, then it should be cleaned.
   • The gasket on the discharge after long-term operation may be worn away, resulting lax discharge and vacuum leakage. If so, the gasket should be replaced.
   • Something may go wrong with the effectiveness and stroke of the pneumatic cylinder after long-term operation. If so, the cylinder should be replaced.
3. Check whether the filter is blocked or not. Blow the filter with a compressed air nozzle in both forward and backward directions. If the air can pass through the filter smoothly, it is unblocked. If not, the filter is blocked and should be replaced. Or you can put the blocked filter into ultrasonic cleaner for 30-minute cleaning.
4. Check if the material suction hose is blocked by big agglomerate material, which usually occurs at the inlet of stainless-steel material suction nozzle or at the inlet of vacuum hopper.
5. If the clamping rings is not fastened between pump head and hopper, or between hopper sections, then it may cause system leakage and thus result in failed feeding or decreased feeding capacity.
6. Reverse blowing system goes wrong. Every time feeder discharges material, the compressed air in the air tank blows the filter in reverse to ensure that there is only a thin powder on the surface of the filter. If the reverse blowing system goes wrong, thicker powder is deposited on the surface of the filter, increasing resistance and then making feeding impossible on the vacuum feeder. In this case, the reverse blowing system should be replaced.