26 - 28 September 2017 // Nuremberg, Germany

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Zoom product LOGO_Big Bag Metering Station

Big Bag Metering Station

LOGO_Big Bag Metering Station

Big Bag Metering Station

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A multitude of manufacturers offer equipment for emptying Big-bags. When you get a general idea on all that you will find some greater differences between the several concepts. This is largely due to the customer’s specifics. It becomes especially complicated when you have a so-called “problematic” bulk material. Imagine some properties like bad flowing, bridging, cohesive, fibrous or blocking. Additionally the emptying of the Bags is not the only imperative. Mostly the material has to be conveyed to the further use, if possible weighed and metered also.

There are some invaluable advantages when all technique comes from one source – an in this special case everything is combined in one compact device.

The objectives of this new DASAG development were set clearly:
  •  Steady metering
  •  Dust-free handling within a closed system
  •  Adjustable flow volume and flow velocity
  •  Partly emptying of the Big bags
  •  Possibility to feed back the excessive material into the big bag
  •  Flexible, autarkic concept of design
The way of solution was to design a metering unit with the Big bag as a flexible weighing container as well as an integrated powder pump.

The plant consists of the following essential parts and functional groups:
  •  Load lifting cross with docking connection and filter bag
  •  Big bag receiving frame with integrated guide sled
  •  Receiving table for Big bag
  •  Receiving construction for the docking system and the powder pump, altogether designed as a weighing frame
  •  Hand-operated on-docking system with passage adapter to the powder pump
  •  DASAG Powder pump with weighing compensator after the pressure spout
  •  Control system with SIWAREX module and a SPS S7-300 with OP3 panel to control all functions of the plant.
Recapitulating, it is to notice that this metering system bases significant upon the advantages of the powder pump because the preparation of material as well as the steady conveying runs over the pump. If you consider the complete system especially concerning the extensive use for a wide range of bulk material, then you will find some further advantages which have not been mentioned as yet. We remember the suction effect of the pump, the permanent pressure monitoring, the optimal material load with absolutely low pressure in the line, the low air volume in the conveying flow and connected with this the small de-dusting equipment, the possible operation with inert gas. Of course some special functions are to be adjusted closely to the respective bulk material. This is possible about the DASAG controls with access to approved function programmes for different product groups. E.g. the mode of action of pneumatic or mechanical discharge assistance can be modified for highly different materials. Anyway a universal and flexible application of the proposed system for a wide range of bulk material is possible.

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