Blending and Packing

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

1. Electronic controller to control the entire filling sequence in automatic mode.
2. Twin Speed Screw Feeder with VFD to control Main & Dribble Feed to maintain speed & accuracy of the system.
3. Foot Switch / Limit Switch operated dust tight pneumatic bag clamping arrangement mounted on 3 Load Cells.
4. Main control panel to house the controller & electrical accessories.
5. Operator pendent with push buttons & Emergency Off.
6. In-feed surge hopper (~50 Litres).
7. Machine junction box & Load Cell junction box IP56.
8. Air filter unit with gauge.
9. Support structure with operator platform.
10. Dust extraction outlets.

 

Note:

1. Pneumatics is of Festo Make.
2. Panel would be of IP56 Protection Rittal make.
3. Structure would be Powder coated.
4. All switchgear items will be of Schneider make.
5. Load Cells will be of Thames Side.
6. MOC – SS 304