Conventional bulk bag unloaders have offered a simple means of handling bulk bags. The only things they lack are automatic fill discharging of contents and safety.
When bulk bags are hoisted high over bulk bag pan, they require an operator to stand rather close to guide bag into unloader. Chopper hoist-trolley operation will make the loaded bag swing dramatically back and forth, causing operator to physically arrest movement of bag before lowering onto bag pan. This places operators too close to a dynamic condition that involves a 2000 pound pendulum swinging overhead.
When a bulk bag is filled, it actually decreases in height. Contents filling a bag tend to push out its sides which makes the bag shorter. The opposite happens when the bag is discharged-it gets longer and skinnier. This causes some of the contents to hang up in the bottom of bag. The only way to rid the bag of its final contents is to have an operator manually manipulate the hoist to draw the bag up higher forcing the bottom of the bag into a cone shape. When this is done in a hurry, the bag can be raised to high allowing escape of dust from discharge of bag. If the bag is handled in haste, it will continue to give up its contents while being trollied out of unloader area, spreading the mess from the bag pan to the floor.
This causes lower product yield and transfer of powder from bulk bag area to ther parts of the plant through fork lift tires.
Babysitting a bulk bag unloader to make sure all of its contents are “jostled” out takes up valuable operator time.
The solution is B-Nav. A patented bulk bag unloader unlike anything on the market today. The limiting factor in conventional bulk bag unloaders is the hoist-trolley. Automation of hoist trolley is not possible for several reasons. Duty cycle, positioning limitations and safety. In order to automate, the hoist had to go. By applying a simple linkage system with actuators, discrete control of bag position is possible. By knowing where the bag is at all times, safety and unload performance challenges have been met. Bulk bags can now travel in a mutlti-directional range which allows for tipping or “jostling” of bag to ensure complete unloading. Once bag has been unloaded, it can be automatically removed and released from unloader head. Once bag has been dropped, the head can swing into position for loading new bag.
More bulk bags can be unloaded per hour and with less operator interface. Loading bags onto unloader can also be done in a safer manner and without operator intervention. This is done through a simple PLC controller. Multiple bag sizes and types can be affectively unloaded by simple settings change. Dynamic unloading functions are also a simple setting away through PLC.
Bulk Bag Unloader
HAF Equipment, Inc.
Centerville, MN USA
Conventional bulk bag unloaders have offered a simple means of handling bulk bags. The only things they lack are automatic fill discharging of contents and safety.
When bulk bags are hoisted high over bulk bag pan, they require an operator to stand rather close to guide bag into unloader. Chopper hoist-trolley operation will make the loaded bag swing dramatically back and forth, causing operator to physically arrest movement of bag before lowering onto bag pan. This places operators too close to a dynamic condition that involves a 2000 pound pendulum swinging overhead.
When a bulk bag is filled, it actually decreases in height. Contents filling a bag tend to push out its sides which makes the bag shorter. The opposite happens when the bag is discharged-it gets longer and skinnier. This causes some of the contents to hang up in the bottom of bag. The only way to rid the bag of its final contents is to have an operator manually manipulate the hoist to draw the bag up higher forcing the bottom of the bag into a cone shape. When this is done in a hurry, the bag can be raised to high allowing escape of dust from discharge of bag. If the bag is handled in haste, it will continue to give up its contents while being trollied out of unloader area, spreading the mess from the bag pan to the floor.
This causes lower product yield and transfer of powder from bulk bag area to ther parts of the plant through fork lift tires.
Babysitting a bulk bag unloader to make sure all of its contents are “jostled” out takes up valuable operator time.
The solution is B-Nav. A patented bulk bag unloader unlike anything on the market today. The limiting factor in conventional bulk bag unloaders is the hoist-trolley. Automation of hoist trolley is not possible for several reasons. Duty cycle, positioning limitations and safety. In order to automate, the hoist had to go. By applying a simple linkage system with actuators, discrete control of bag position is possible. By knowing where the bag is at all times, safety and unload performance challenges have been met. Bulk bags can now travel in a mutlti-directional range which allows for tipping or “jostling” of bag to ensure complete unloading. Once bag has been unloaded, it can be automatically removed and released from unloader head. Once bag has been dropped, the head can swing into position for loading new bag.
More bulk bags can be unloaded per hour and with less operator interface. Loading bags onto unloader can also be done in a safer manner and without operator intervention. This is done through a simple PLC controller. Multiple bag sizes and types can be affectively unloaded by simple settings change. Dynamic unloading functions are also a simple setting away through PLC.
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