Bag Filling System (Net Weigher)
Sequence of Operation
The filling sequence starts after the operator clamps the bag & a START input from via push button on the controller or foot switch. The controller automatically tares the gross weight to obtain a Net weight of zero. The material is then fed into the bag, a twin speed screw feeder controls the rate at which it is fed. The controller compares the actual weight with the target weight settings, when the Main/Coarse feed setting is reached the main feeder is switched to Fine feed & feeding continues in the Fine/Dribble feed mode. The material is fed in the fine feed mode until the Final Weight minus In-Flight value is reached, after which the Fine feeder is stopped. Once the feeding is stopped a settling time (adjustable time, varies from 500ms to 1 sec) is given after which the end of batch is signaled, automatically the Totalizer and Bag Counter is updated. A pneumatically actuated consolidation mechanism is used to consolidate the product in the bag.
Safety Features & Interlocks
1. Sensor is provided to ensure that the bag is clamped.
2. Screw Feeder is interlocked through the bag sensor; ensure material will be discharged only if the bag is clamped.
3. Double acting solenoids for bag clamping ensure that in case of power failure the bag remains clamped in its position.
User Friendly Features
1. No operator adjustments are necessary when changing to different capacities, soft touch keys on the controller select recipes.
2. Auto-In-flight correction and auto tare facilities are incorporated to maintain accuracy and to avoid frequent adjustments ensuring hassle free operations.
Controller Specification
The controller is equipped with a powerful CPU including integrated digital I/O’s.
Strain Gauge module with 24-bit ADC.
The controller is equipped with Operator panel, which helps visualization of tasks. Communication interface Ethernet is provided. These controllers are tested and certified to perform in harsh industrial environment including excessive shock, high temperature and continuous operation.
Technical Data
Display: Colour HMI with Touch Screen
Digital Inputs: 12
Digital Outputs: 12
Strain Gauge Module: 1
Interfaces : Ethernet
Protection Category : IP65
Load Cell Specifications
Sensitivity: 2mV/V
Rated Excitation: 10VAC or DC
Max. Excitation: 15VAC or DC
Bridge Resistance: 350 Ohms
Insulation Resistance : 1000Meg Ohms
Zero Balance: +/- 0.1mV
Non-Linearity: <0.025% of FS
Hysterisis: <0.020% FS
Non-Repeatability: <0.010% FS
Creep (30min at Nom Load) : <0.020% FS
Operating Temperature: -20Deg C to 70Deg C
Safe Overload: 150%
Ultimate Overload: 300%
MOC: Stainless Steel
Protection Class: IP68
| Equipment |
Open Mouth Bag Filling Machine |
| Process Design Information |
| Material to be handled |
Dry Coconut Powder |
|
| Bulk density of material |
350 |
Kgs/m3 |
| Is material free flowing |
No |
|
| Is material abrasive/Corrosive |
No/No |
|
| Capacity |
1 – 2 |
BPM |
| Particle size |
**TBC |
|
| Weighing Range |
25 – 50 |
kg/bag |
| Inlet Temperature |
**TBC |
Deg.C |
| Type of Bags |
Open |
|
| Accuracy |
+/-75g or better of the bag weight |
|
| Feeder Details |
| Type of Bagging Machine |
Electro Pneumatics |
|
| Type of Load Cells |
Bending Beam |
|
| Feeder |
Twin Speed Screw Feeder |
S.S |
| Shut Off Valve |
Pneumatically actuated gate |
|
| Type of Panel |
Dust & Vermin proof, IP 56 |
|
| Material of Construction |
| Hopper |
S.S |
|
| Ducts & Valve |
S.S |
|
| Supports |
M.S Powder Coated |
|
| Bellows |
Nylon Fabric |
|
| Gaskets |
Food Grade Rubber |
|
| Other Information |
| Electrical supply |
440V, 3 Phase, 50 Hz. |
|
| System control supply voltage |
24V DC. |
|
| Air Supply |
110 – 150 lpm 6 kg/cm2 |
|
|
Procurement Information |
GA and foundation drawing will be provided and Supervision during commissioning of the system |
** TBC – To Be Confirmed
Scope of Supply per system
- Electronic controller to control the entire filling sequence in automatic mode.
- Twin Speed Screw Feeder with VFD to control Main & Dribble Feed to maintain speed & accuracy of the system.
- Foot Switch / Limit Switch operated dust tight pneumatic bag clamping arrangement mounted on 3 Load Cells.
- Main control panel to house the controller & electrical accessories.
- Operator pendent with push buttons & Emergency Off.
- In-feed surge hopper (~50 Litres).
- Machine junction box & Load Cell junction box IP56.
- Air filter unit with gauge.
- Support structure with operator platform.
- Dust extraction outlets.
Note:
- Pneumatics is of Festo Make.
- Panel would be of IP56 Protection Rittal make.
- Structure would be Powder coated.
- All switchgear items will be of Schneider make.
- Load Cells will be of Thames Side.
- MOC – SS 304
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