إظهار الأشرطة الجانبية

Weighing system for a semiautomatic big bag filling machine

Big bag filling station for bagging plastic granules.

Requirement

Stawimpianti s.r.l. needs to equip a big bag filling machine with a weighing system for a leading plastic manufacturer.

The machine is part of a plant for the mechanical extraction of plastic granules from storage silos, consisting of two big bag filling stations.

The goal is to fill the bags with bulk product and ensure consistent weight across all big bags through repeatable weighing.

Stawimpianti s.r.l. is an italian company that has been designing, building, and installing complete systems for storing, batching, ans conveying solid bulk raw materials, in powder, granule, or flake form, for over 30 years.

Our solution

For the weighing system we used:

3 FTP 1000 shear beam load cells;
3 T12FTAGP mounting kits;
1 CE41N ABS junction box;
1 TLM8 PROFINET IO weight transmitter.

How does it work?

The operator hooks the bag's strap onto the hooks and starts the automatic cycle from the power panel.
A fan integrated into the machine inflates the bag so that the incoming material has much space as possible.

Once the big bas is inflated, the loading screw conveyor begins unloading the plastic granules from the silo and filling the big bag, while the load cells continuously weigh the bag.

The load cells are installed above a rotating slewing ring, positioned in the machine's upper operating unit, at the top of the bag where the suspension hooks are located.

The load cells are connected in parallel to the CE41N ABS junction box, which has an IP67 protection rating that is essential for shielding the board from dust and moisture.

The rotating slewing ring is a large structural bearing that makes it easier for the operator to hook the 4 loops of the bag without physically walking around the machine.
The fixed structure becomes a rotating station, making the filling operation safer, more convenient, and faster.

The junction box is connected to the TLM8 weight transmitter, located in the power panel away from the structure, which transmits the weight data to the PLC via PROFINET IO fieldbus.

When the load reaches the previously set setpoint value, the PLC sends a command to the TLM8 which, via its relay contacts, triggers the closure of the filling valve, and the full bag is ready to be unhooked.

The added value

The FTP 1000 load cells offer an excellent quality/price ratio, are reliable and have a high protection rating.
The T12FTAGP mounting kit ensures precise and accurate weighing: it features a rubber-coated stainless steel joint that compensates for structural unevenness and dampens vibrations generated by the hydraulic power unit and other moving components.
The TLM8 PROFINET IO weight transmitter ensures easy, reliable, and fast communication: the robust fieldbus signal transfers the load cell signal to the PLC securely, even when the PLC is located far from the weighing system.
The load cells, in combination with the TLM8 weight transmitter, ensure consistent bag weights leaving the facility, eliminating measurement errors.
The machine's semi-automatic execution supports and enhances operators workflow: filling operations are faster, safer and more efficient.

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