Vacuum Conveying:
The Principle
Examples of Conveyed
Materials
Vacuum Conveying:
Cost Example

Our Conveyor Designs
VR - Vacuum Conveyors
PPC - Vacuum Conveyors
Tablet-Conveyors
Vacuum Conveyors
with Inerting Option
Pressure-Proof
Vacuum Conveyors
Vacuum Conveying
inside Explosion-Zones
Vacuum Conveyors
with Weighing and
Measuring Function
Loading and Unloading
Stations for Vacuum
Conveyors
Suction of Liquids

Applications:
Chemicals
Dye-Powder and Pigments
Pharmaceuticals
Tablets, Capsules and
Dragees
Food

Complete Solutions for the
Handling and Processing
of Powders

Inquiry Form for
Vacuum Conveyors

Volkmanns VAWIDOS and CONWEIGH System:
Vacuum-Conveyors with Weighing-
and Dosing-Function

Volkmann Vacuum Conveyors with weighing and dosing function are built on the basis of VR and PPC conveyors, so the field of possible applications is wide spread. They work gravimetrically with the vacuum conveyor mounted on a special frame being decoupled completely from external forces and shocks. The filling weight is measured all-over the suction cycle. The special design and assembly offers the well known advantages, which come with all Volkmann Vacuum Conveying systems (easy accessibility and cleaning).

At an operating panel you just enter the desired target weight of the certain product or recipe to be conveyed/mixed. The control unit has got an internal product database, which stores up to 256 different components in its basic memory. For each component the maximum filling weight of the vacuum conveyor per suction cycle must be set to prevent over-filling. The whole weighing- and conveyor-control is integrated into the panel.

With the confirmation of the typed in target value the system works automatically and runs all suction cycles to reach the target weight. All functions are controlled: the vacuum pump, the air shock system, the discharge valve, secondary valves etc. You can connect the control panel to centralized units by different interfaces or integrate it into plant control systems (programming done in IEC1131).

During the conveying/weighing you can see the following information on the display: the present filling weight of the conveyor, the target weight given in, the weight remaining which still needs to be conveyed and the present conveying capacity in kg/min. (lbs/min.)

During the last suction cycle the product load in the suction line is lowered by secondary air for fine tuning and optimization of the final filling process. After discharging the final batch a counter measurement is done and you can read the total weight the system has conveyed. You get an alarm-signal, if the value is outside an indicated tolerance (the upper and lower tolerance can be product specific and are also in the memory of the control unit).

The measurement inaccuracy is below 0,1% of the measuring range. The vacuum conveyor by itself hits the target value at a tolerance of ± 50 to 200 grammes depending on the product – the display will show you this value after the final suction cycle. If your application requires lower tolerances, we can offer combinations with other weighing/dosing systems and to the planning and integration for you. Just ask us for our solution.