Worm Gearbox for Screw Conveyor / Auger — Reliable Bulk Material Drive
Screw conveyors and augers are the workhorses of mineral processing, grain handling, cement plants, and waste-management facilities. A compact worm gearbox mounted directly to the trough end-plate drives the screw at precisely controlled low speeds while handling the high resistive torques generated by dense, abrasive, or sticky bulk materials. Visit our applications page to explore the full range of worm reducer use cases.
Application Detail: Screw Conveyors in Mining & Processing
In mining applications, screw conveyors transport ore fines, tailings, and filter cake at controlled feed rates. The worm gear reducer provides the necessary speed reduction from a standard 1,450 rpm motor to typical screw speeds of 20–120 rpm, while generating the high starting torque needed to shear through packed material. The hollow-shaft (torque-arm) mounting option — where the gearbox slides directly onto the conveyor screw shaft — eliminates the need for a separate coupling, shaft alignment, and mounting frame, reducing installation time significantly.
Construction Details
- Housing: Heavy-duty cast-iron body with high-grade sealing — prevents fine ore dust and moisture from contaminating the gear oil.
- Worm Wheel: Tin-bronze (ZCuSn10Pb1) — provides the lubricity needed for the high contact stresses in slow-speed, high-torque operation.
- Seals: Special heavy-duty oil seals rated IP65+ — resists fine dust ingress characteristic of mineral processing environments.
- Output Options: Solid shaft, hollow bore (torque-arm), or flanged output for direct trough mounting.
Technical Parameters
| Parameter | Value / Range |
|---|---|
| Gear Ratio | 7.5:1 – 100:1 |
| Output Torque | Up to 3,200 Nm (standard series) |
| Input Speed | 1,450 rpm (50 Hz, 4-pole) |
| Typical Screw Speed | 15 – 120 rpm |
| Housing Material | Grey cast iron GG25 / Nodular cast iron GGG50 |
| Mounting | Foot-mount, hollow shaft torque-arm, flange mount |
| Protection | IP55 standard; IP65 with heavy-duty seals |
| Thermal Rating | S1 continuous duty; S2/S3 for intermittent loading |
Service Factor Note: Screw conveyors handling wet, sticky, or over-sized material should use a service factor of 2.0–2.5. If the screw is started under full load (choked condition), an additional start-up torque allowance of 2× rated torque for up to 2 seconds should be confirmed against the gearbox peak-torque rating.
Standards & Certifications
Worm gear units for screw conveyors conform to ISO 9001:2015 quality management and carry CE marking. Input flanges comply with IEC 60072 motor-frame dimensions, covering B3, B5, and B14 mounting types for compatibility with all standard three-phase and single-phase motors. Dust protection IP65 is standard; IP66 is available for wash-down environments in mineral processing plants.
Real-World Case Studies
Gold Processing Plant — Northern Territory — Tailings screw conveyor
Challenge: Standard gearboxes failed within 4 months due to ultra-fine gold tailings penetrating seals.
Solution: Fitted cast-iron worm reducers with IP65 heavy-duty triple-lip seals and quarterly oil analysis program.
Result: MTBF increased from 4 months to 26 months; annual replacement costs down 78%.
Cement Plant — South Australia — Raw meal screw feeder
Challenge: Gearboxes ran excessively hot (>90°C oil temperature) during summer at 42°C ambient.
Solution: Switched to synthetic ISO VG 220 oil and added external cooling fins; thermal derating applied during design.
Result: Oil temperature stabilised at 72°C maximum; no heat-related failures in two production seasons.
Grain Terminal — Fremantle, WA — Ship-loader auger conveyor
Challenge: High starting torque when auger engaged compacted grain caused motor tripping and coupling shear.
Solution: Selected worm reducer with ratio 50:1 and peak-torque rating 2.5× rated load; hollow-shaft mount eliminated coupling.
Result: Zero coupling failures; auger starts reliably under full load with motor protection intact.
Why Partner with Us?
Hollow-Shaft Expertise
Torque-arm hollow-shaft models eliminate coupling alignment — reduce installation time by up to 60%.
Custom Auger Interfaces
Non-standard bore diameters and keyway profiles machined to your screw-shaft drawings.
Thermal Engineering
Thermal capacity calculations provided for high-ambient and enclosed installations at no charge.
Export Packaging
Sea-freight rated crating and corrosion-protection packaging for remote mining sites.
Full Documentation
Test certificates, material certs, and dimensional drawings supplied with every order.
Frequently Asked Questions
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