Proven pre-engineered pneumatic convey and weigh system is modular in construction. Proven technology combines conveying, powder densifying, feeding and weighing all in one pre-engineered package. Proven technology that produces exceptionally accurate batches.
Modules can be arranged in a radial or inline. Each module consists of a tool free take apart quick clean vacuum filter receiver with live bin discharger, precision volumetric feeder, unitary mount frame and scale set. Vacuum receivers can be either top load or horizontal load models. Every module is pre-assembled, wired and tested before shipping. Convey line size range from 2” diameter line size to 4” diameter line size.
Operation Methodology
A vacuum is created in housing, causing solids mixed with air to enter into module. Powder fills module in a controlled gain in weight fill mode. Once filled the module is ready to dose a batch. Dosing starts by the opening of discharge valve. Once valve is open, the volumetric feeder with live bin discharger starts. Powder begins to loss in weight discharge until a first set point is achieved. At this point, a slower speed on the feeder reduces forward velocity of powder.
Powder keeps flowing at a low constant velocity until a second set point is reached. At this point, the live
bin discharger shuts down to provide a “quiet” final scaling mode. The feeder goes into a jogging feature designed to slowly approach final set point. Once the final set point threshold has been crossed, batch is stopped. There is no pre-act scale control. The scale set point weight needs to be hit or crossed to go to batch complete.
For very large batches, the module will need to transfer and dose several times to achieve desired batch size. When working to a large batch, the “in flight” make up does not utilize the dual set point feature. Every time the module in flight doses, the feeder runs at full speed until a desired loss in weight has been achieved. Once this weight has been hit, the discharge valve closes allowing module to be replenished with powder. A totalize in scale keeps a running track of how many pounds of powder where in flight dosed. This action automatically runs until first set point scale weight is achieved. Module now returns to scaled dosing mode.
Modular construction provides various sized surge hoppers to reduce the amount of in flight cycling. Better accuracy is also achieved by placing more powder weight on scale through larger surge sizes.
Accuracy
Smaller module utilizes smaller augers. This feature proves more auger definition for more control at dosing. Large CNW modules consistently produce accuracies of .1 pounds for any sized batch. This is done through a 6” feeder. Smaller CNW modules will achieve accuracies of better than .1 pounds (testing of powder required).
All scale control from tare to weight set point adjustments is available through single HMI. Operator interface is intuitive and provides an autonomous path to scale accuracy.
Greater batch speed reduces batch accuracy. The longer the scale is in the secondary jog mode, the greater the accuracy. This secondary mode can be adjusted down to a millisecond level for great auger control.
Modular
CNW modules can be clustered in groups of up to (6) modules. A single controller is provided for cost savings and systems integration. All modules can run simultaneously. Optional sub frame integration is offered to speed up install and start up time.
Controls
Standard offering provides an Allen Bradley MicroLogix PLC in combination with either a PanelView 600 color touch screen or a PanelView plus. All drives are Allen Bradley PowerFlex with speed control through PLC and HMI. Hardy scale modules are integrated into panel and displayed on HMI. Scale control is intuitive and module specific.
Power in is typically 230 or 460/3/60 with internal power at 120/1/60. Panels are professionally executed and are UL listed.
Convey-N-Weigh
HAF Equipment, Inc.
Centerville, Minnesota, USA
Proven pre-engineered pneumatic convey and weigh system is modular in construction. Proven technology combines conveying, powder densifying, feeding and weighing all in one pre-engineered package. Proven technology that produces exceptionally accurate batches.
Modules can be arranged in a radial or inline. Each module consists of a tool free take apart quick clean vacuum filter receiver with live bin discharger, precision volumetric feeder, unitary mount frame and scale set. Vacuum receivers can be either top load or horizontal load models. Every module is pre-assembled, wired and tested before shipping. Convey line size range from 2” diameter line size to 4” diameter line size.
Operation Methodology
A vacuum is created in housing, causing solids mixed with air to enter into module. Powder fills module in a controlled gain in weight fill mode. Once filled the module is ready to dose a batch. Dosing starts by the opening of discharge valve. Once valve is open, the volumetric feeder with live bin discharger starts. Powder begins to loss in weight discharge until a first set point is achieved. At this point, a slower speed on the feeder reduces forward velocity of powder.
Powder keeps flowing at a low constant velocity until a second set point is reached. At this point, the live
bin discharger shuts down to provide a “quiet” final scaling mode. The feeder goes into a jogging feature designed to slowly approach final set point. Once the final set point threshold has been crossed, batch is stopped. There is no pre-act scale control. The scale set point weight needs to be hit or crossed to go to batch complete.
For very large batches, the module will need to transfer and dose several times to achieve desired batch size. When working to a large batch, the “in flight” make up does not utilize the dual set point feature. Every time the module in flight doses, the feeder runs at full speed until a desired loss in weight has been achieved. Once this weight has been hit, the discharge valve closes allowing module to be replenished with powder. A totalize in scale keeps a running track of how many pounds of powder where in flight dosed. This action automatically runs until first set point scale weight is achieved. Module now returns to scaled dosing mode.
Modular construction provides various sized surge hoppers to reduce the amount of in flight cycling. Better accuracy is also achieved by placing more powder weight on scale through larger surge sizes.
Accuracy
Smaller module utilizes smaller augers. This feature proves more auger definition for more control at dosing. Large CNW modules consistently produce accuracies of .1 pounds for any sized batch. This is done through a 6” feeder. Smaller CNW modules will achieve accuracies of better than .1 pounds (testing of powder required).
All scale control from tare to weight set point adjustments is available through single HMI. Operator interface is intuitive and provides an autonomous path to scale accuracy.
Greater batch speed reduces batch accuracy. The longer the scale is in the secondary jog mode, the greater the accuracy. This secondary mode can be adjusted down to a millisecond level for great auger control.
Modular
CNW modules can be clustered in groups of up to (6) modules. A single controller is provided for cost savings and systems integration. All modules can run simultaneously. Optional sub frame integration is offered to speed up install and start up time.
Controls
Standard offering provides an Allen Bradley MicroLogix PLC in combination with either a PanelView 600 color touch screen or a PanelView plus. All drives are Allen Bradley PowerFlex with speed control through PLC and HMI. Hardy scale modules are integrated into panel and displayed on HMI. Scale control is intuitive and module specific.
Power in is typically 230 or 460/3/60 with internal power at 120/1/60. Panels are professionally executed and are UL listed.
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