Continuous auger

General description
The screw batch charger is a continuous feeding system for glass furnaces designed to meter and charge glass batch and cullet with controlled flow rate. The unit improves furnace feeding consistency and integrates with level-control systems to maintain stable glass production.

Installation
Screw batch chargers are mounted in the furnace back wall through a refractory block. The charging mechanism is fixed on a welded steel support frame equipped with four wheels that run on rails for straightforward positioning and removal during maintenance.

Main components

• Rails
• Supporting steel profile frame
• Feeding hopper
• Screw with special external coating
• Feed tube
• Refractory protection at the screw nose
• Drive system with AC servo / three-phase motor and gearbox

Batch loading
Material is fed into the hopper and gravity-feeds into the feed tube onto the coated steel screw which conveys the batch into the furnace. The screw is driven by a three-phase asynchronous motor with a speed-reducing gearbox. Motor speed is regulated by an inverter on the main control board receiving a 4–20 mA signal from the glass level controller to enable continuous, smooth charging rate adjustment. The drive includes large-diameter conical roller bearings and protections to prevent batch from damaging bearings.

Benefits

• Improves furnace pulling rate and production consistency
• Reduces energy consumption through stable feeding
• Minimizes dust carry-over and furnace pollution
• Decreases glass level oscillation
• Helps reduce NOx formation

Model-specific data (example model shown)
Model: INF CR R 270/1250 040 AA

Technical table (example values)
Feeding tube inner diameter: 270 mm
Screw diameter: 250 mm
Screw pitch: 150 mm
Gear box ratio: 1 to 171.5
Motor speed: 1430 rpm
Screw speed: 8.3 rpm
Flow rate: 7.5 to 37 Kg/min
Material being handled: Glass batch – Cullet only – Glass batch & cullet
Max cullet size: 25 mm
Moisture content: 0,5 to 3%
Main motor power: 1.5 kW
Electric power connection: 3Ph + E / 400 VAC 50 Hz
Dimensions (L x H x W): 2800 x 2000 x 650 mm

Technical specifications

• Installation: rear-wall mounting through refractory block; welded steel frame with four wheels on rails for positioning/removal
• Construction: supporting steel profile frame; feed hopper; feed tube with refractory protection at screw nose
• Screw: steel screw with special external coating to minimize wear
• Drive: AC servo / three-phase asynchronous motor with speed-reducing gearbox and inverter control (driven by 4–20 mA signal from glass level control) for continuous regulation
• Bearing and protection: large diameter conical roller bearings and systems to prevent batch damage to bearings
• Material handled: glass batch, cullet only, or combination of batch & cullet
• Typical model example: INF CR R 270/1250 040 AA (feeding tube Ø 270 mm, screw Ø 250 mm, pitch 150 mm)
• Flow rate range: 7.5–37 Kg/min
• Max cullet size accepted: 25 mm
• Acceptable moisture content: 0.5–3%
• Main motor power (example): 1.5 kW
• Electric supply (example): 3Ph + E / 400 VAC 50 Hz
• Overall dimensions (example): 2800 x 2000 x 650 mm