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.
| 매개변수 | 사양 |
|---|---|
| 기어비 범위 | 20:1 – 60:1 |
| 출력 토크 범위 | 50 – 1,500 Nm |
| 입력축 직경 | Ø 11 mm – Ø 35 mm |
| 출력축 직경 | Ø 20 mm – Ø 70 mm |
| 주택 자재 | Grey Cast Iron with Cooling Fins |
| 장착 옵션 | 풋 마운트 / 플랜지 마운트 / 샤프트 마운트 |
Screw feeder duty is relatively steady, but startup under a full hopper imposes significant breakaway torque. Apply a 서비스 팩터(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.
CE 인증 — Full compliance with European Machinery Directive 2006/42/EC for global market access.
IEC 표준 인터페이스 — Motor input flanges and shaft dimensions conform to IEC 60072 범용 모터 호환성을 위해.
NEMA 표준 옵션 — NEMA C-페이스 북미 모터 통합을 위한 발판 장착 구성도 제공됩니다.
IP65/IP66 보호 등급 — 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)
도전: Variable feed rate caused inconsistent pellet quality; existing drive could not maintain stable low-speed operation below 10 rpm.
해결책: Installed 50:1 ratio worm reducer providing smooth output at 8 rpm with minimal speed hunting.
결과: Feed rate consistency improved to ±2%; pellet quality rejections reduced by 35%.
📈 Coal Handling Plant – Hunter Valley
Equipment: Twin-Screw Feeder System
도전: Bulky two-stage helical reducers could not physically fit beneath the low-clearance coal bin discharge chutes.
해결책: Compact worm gearboxes with shaft-mount configuration attached directly to the feeder screw shaft.
결과: Installation completed without modifying bin structure; drive footprint reduced by 65%.
⚙ Mineral Sands Processing – Western Australia
Equipment: Weigh Feeder Drive
도전: Speed fluctuations in DC motor drive caused ±8% mass flow variation, affecting downstream gravity separator performance.
해결책: Worm reducer paired with VFD-controlled AC motor delivered smooth, repeatable speed control at 12 rpm.
결과: Mass flow accuracy improved to ±1.5%; separator mineral recovery increased by 4%.
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업계 경험
Over 20 years of worm gearbox manufacturing expertise serving the mining sector and dozens of other industries worldwide.
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원격 기술 지원
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맞춤형 샤프트 구성, 특수 장착 브래킷, 수정된 기어비 및 맞춤형 하우징 재료를 포함한 모든 비표준 설계 기능을 통해 정확한 적용 요구 사항을 충족합니다.
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탁월한 가치
중간 유통 마진 없는 공장 직판 가격. 경쟁력 있는 최소 주문 수량(MOQ) 유연성 및 프로젝트 기반 구매를 위한 대량 구매 할인 프로그램.
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글로벌 물류
호주의 모든 주요 항구로 연결되는 안정적인 운송 경로를 확보하고 있으며, 시드니와 멜버른에 보세창고를 운영하여 신속한 국내 배송을 제공합니다.
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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