Screw feeders are critical metering devices in mineral processing, controlling the volumetric flow of powders, granules, and crushed ore from storage bins to downstream equipment. Precise, stable speed control at very low RPM is essential for consistent process throughput. The worm reducer excels in this role, providing smooth low-speed output in a compact package that fits beneath hopper discharge points and in tight process plant layouts.
A screw feeder uses a helical auger rotating within a trough to move bulk material at a controlled rate. Output speeds are typically very low — 5 to 50 rpm — demanding high reduction ratios from the drive system. The worm gearbox delivers these ratios (up to 60:1 in a single stage) without the complexity and size of multi-stage helical reducers.
Installation space beneath hoppers and bins is invariably restricted. The compact right-angle configuration of worm gear units allows the drive motor to be oriented sideways, minimising the vertical footprint. This installation flexibility is a primary reason worm reducers dominate screw feeder applications in mineral processing plants.
The worm shaft is carbon steel with surface hardening, mated to a cast phosphor bronze worm wheel with low friction coefficient for efficient power transfer. The grey cast iron housing incorporates external cooling fins to dissipate heat during continuous feeder operation, maintaining stable lubricant temperature and extending oil change intervals.
| Параметр | Специфікація |
|---|---|
| Діапазон передавальних чисел | 20:1 – 60:1 |
| Діапазон вихідного крутного моменту | 50 – 1,500 Nm |
| Діаметр вхідного вала | Ø 11 mm – Ø 35 mm |
| Діаметр вихідного вала | Ø 20 mm – Ø 70 mm |
| Матеріал корпусу | Grey Cast Iron with Cooling Fins |
| Варіанти монтажу | Foot Mount / Flange Mount / Shaft Mount |
Screw feeder duty is relatively steady, but startup under a full hopper imposes significant breakaway torque. Apply a Коефіцієнт обслуговування (SF) of 1.25 to 1.5. For feeders handling abrasive materials, verify that the housing seal rating (IP55 minimum) prevents process dust from contaminating the lubrication. Ambient temperature in enclosed process buildings is generally moderate, but feeders positioned outdoors or near kilns require thermal derating. Shaft-mounted worm reducers eliminate alignment concerns and simplify installation under space-constrained hoppers.
ISO 9001:2015 — Quality management system certified across all manufacturing and assembly processes.
Сертифікація CE — Full compliance with European Machinery Directive 2006/42/EC for global market access.
Стандартні інтерфейси IEC — Motor input flanges and shaft dimensions conform to ІЕК 60072 для універсальної сумісності з двигунами.
Стандартні опції NEMA — NEMA C-подібна поверхня а також конфігурації з кріпленням на ніжках, доступні для інтеграції двигуна в Північній Америці.
Захист IP65 / IP66 — Ingress protection rated for complete dust exclusion and resistance to powerful water jets, ensuring reliable operation in harsh outdoor and industrial environments.
⚖ Iron Ore Pellet Plant – Western Australia
Equipment: Screw Feeder (Bin Discharge)
Виклик: Variable feed rate caused inconsistent pellet quality; existing drive could not maintain stable low-speed operation below 10 rpm.
Рішення: Installed 50:1 ratio worm reducer providing smooth output at 8 rpm with minimal speed hunting.
Результат: Feed rate consistency improved to ±2%; pellet quality rejections reduced by 35%.
📈 Coal Handling Plant – Hunter Valley
Equipment: Twin-Screw Feeder System
Виклик: Bulky two-stage helical reducers could not physically fit beneath the low-clearance coal bin discharge chutes.
Рішення: Compact worm gearboxes with shaft-mount configuration attached directly to the feeder screw shaft.
Результат: Installation completed without modifying bin structure; drive footprint reduced by 65%.
⚙ Mineral Sands Processing – Western Australia
Equipment: Weigh Feeder Drive
Виклик: Speed fluctuations in DC motor drive caused ±8% mass flow variation, affecting downstream gravity separator performance.
Рішення: Worm reducer paired with VFD-controlled AC motor delivered smooth, repeatable speed control at 12 rpm.
Результат: Mass flow accuracy improved to ±1.5%; separator mineral recovery increased by 4%.
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Досвід роботи в галузі
Over 20 years of worm gearbox manufacturing expertise serving the mining sector and dozens of other industries worldwide.
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Повні можливості нестандартного проектування, включаючи нестандартні конфігурації валів, спеціальні монтажні кронштейни, модифіковані передавальні числа та індивідуальні матеріали корпусу для задоволення точних вимог застосування.
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Ціноутворення безпосередньо від заводу без посередницьких націнок. Конкурентна гнучкість мінімального замовлення та програми оптових знижок для закупівель на основі проектів.
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Глобальна логістика
Налагоджені маршрути доставки до всіх основних австралійських портів з опціями митного складування в Сіднеї та Мельбурні для швидкого внутрішнього відправлення.
Ratios of 30:1 to 50:1 are most commonly used, producing typical feeder speeds of 10–30 rpm from a standard four-pole motor. Higher ratios can achieve feeder speeds below 10 rpm for fine powder metering applications.
Yes. The bronze worm wheel absorbs startup torque spikes effectively. Size the gearbox with a service factor of 1.5 to accommodate the breakaway torque when the hopper applies full column pressure on the screw auger.
Shaft-mounted worm reducers are widely available and are the preferred configuration for screw feeders. The gearbox mounts directly on the feeder drive shaft, eliminating the coupling, baseplate, and alignment procedures required for foot-mounted units.
The gearbox itself is sealed from the process material. Select a unit with IP55 or higher protection to prevent fine abrasive dust from entering the oil chamber. External shaft seals should be rated for dusty environments.
Synthetic PAO or PAG gear oil rated ISO VG 220 provides optimal film strength for continuous duty. Change intervals of 8,000–10,000 hours are achievable with synthetic lubricants, significantly reducing maintenance in remote mining locations.
A single-stage worm reducer at 50:1 is typically 40–60% smaller and lighter than a two-stage helical reducer delivering the same ratio, making it the preferred choice for space-constrained feeder installations.
Every screw feeders installation has unique requirements. Send us your specifications and our application engineers will recommend the best worm gear solution, complete with technical drawings and competitive pricing.
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