Screw feeders transfer bulk material from a hopper or silo outlet to the next process stage at a controlled volumetric rate. The drive unit must deliver stable, low-speed torque continuously, accommodate the variable resistance as material compacts and arches in the hopper throat, and maintain set speed without hunting. The transmisión por engranaje helicoidal is the industry-standard drive for screw feeders due to its compact single-stage high reduction, right-angle output, and ability to maintain exact output speed under variable load without electronic correction.
In Australian mining, cement, and chemical processing, screw feeders handling fine abrasive powders — iron ore fines, cement raw meal, fly ash, lime — require drive units completely sealed against ingress. The worm gearbox’s low-profile sealed housing and standard IP65 protection make it the correct choice for dusty material handling environments.
The compact form factor of worm gearboxes — with output shafts available in solid and hollow bore configurations — adapts directly to the screw feeder’s central tube structure, enabling shaft-through mounting without external couplings that could become packed with process material.
Worm gear drives appear throughout the screw feeder circuit in processing plants:
Material specification for screw feeder service: Worm shaft in carbon steel with surface hardening and precision-ground helical thread. Worm wheel in cast phosphor bronze — critical for the sustained sliding contact typical of screw feeder operation. Housing in grey cast iron with heat dissipation fins. Sealed input and output penetrations to IP65.
Selection principle: Screw feeder drives are classified as uniform-load continuous duty (SF=1.0 for standard; SF=1.25 for feeders handling material that may compact). Output speed is typically 2–20 RPM for volumetric feeders and 20–80 RPM for transfer screws.
Utilice la tabla a continuación para identificar el modelo apropiado. Los parámetros clave incluyen la relación de reducción, el par de salida, las dimensiones del eje y el material de la carcasa. Aplique siempre el correcto Factor de servicio (SF) para su ciclo de trabajo.
| Parámetro | Rango/Valor típico | Notas de selección |
|---|---|---|
| Relación | 20:1 – 100:1 | Covers output speeds 14–70 RPM at 1,400 RPM motor input |
| Par de salida | 10 – 4,200 N·m | Frame 025–150; confirm SF before frame selection |
| Eje de entrada | IEC 60034 B5/B14 flange | Direct-mount to 4-pole standard motors |
| Eje de salida | Solid or hollow bore | Hollow bore enables direct screw shaft pass-through |
| Material de vivienda | Grey Iron with fin casting | Thermal management for continuous low-speed operation |
| Lubricación | Oil bath, standard mineral ISO VG 220 | Synthetic PAO for 24-hour continuous duty |
| Clase de protección | IP65 standard | Critical for fine powder and dust environments |
► Factor de servicio (FS): Carga uniforme SF=1,0 | Choque moderado SF=1,25–1,5 | Choque fuerte / 24 h continuo SF=1,75–2,0
► Temperatura ambiente: Las unidades estándar tienen una clasificación de -10 °C a +40 °C. Las instalaciones australianas con altas temperaturas ambiente (>45 °C) requieren lubricante de alta temperatura y una reducción de la capacidad térmica según la norma 15%.
Disponible en tamaños de bastidor de 025 a 150. Reducción de una etapa de 5:1 a 100:1. Par de salida de hasta 4200 N·m. Carcasa de aluminio o hierro dúctil. Brida del motor IEC B5/B14. Protección IP65 estándar, IP66/IP67 opcional. Lubricación con aceite sintético o mineral.
Problema del cliente: A cement plant’s limestone silo screw feeder was overheating during the 22-hour daily operating cycle — housing temperature reaching 92°C and tripping the motor protection relay at hour 18 of each shift.
Solución: Upgraded from an undersized NMRV-063 to NMRV-090 (same ratio 40:1) with synthetic PAO ISO VG 320. The larger frame reduced equilibrium operating temperature by 18°C. A partially clogged outlet adding 35% to running torque was also cleared.
Resultado: Housing temperature stabilised at 67°C during the full 22-hour shift with no thermal trips. The synthetic lubricant oil change interval extended to 5,000 hours.
Problema del cliente: A water treatment plant’s lime dosing screw feeder was producing inconsistent dose rates — gearbox output varying ±4 RPM around the setpoint due to backlash, causing pH control instability in the clarifier circuit.
Solución: NMRV-040 worm gearbox (ratio 60:1) replaced the helical unit. Worm mesh eliminates backlash at low speeds, reducing speed variation to below ±0.2 RPM at the 8 RPM setpoint.
Resultado: Clarifier pH consistency improved from ±0.3 pH to ±0.05 pH. Lime consumption reduced by 7% through more precise dosing.
Problema del cliente: A grain storage facility’s 30° inclined auger was allowing grain to roll back through the auger flights after each operational stop. A separate backstop ratchet mechanism was jamming on fine grain particles.
Solución: NMRV-063 worm gearbox (ratio 40:1, IP65, food-grade H1 lubricant) replaced the open helical gearbox and ratchet combination. The worm self-lock prevented any rollback on stop.
Resultado: Grain rollback eliminated entirely. The ratchet mechanism and its quarterly maintenance requirement were removed from the site maintenance schedule. The same model was subsequently installed on seven further auger points at the facility.
Reductores de tornillo sin fin de la serie NMRV / NRV — tamaños de bastidor 025 a 150, fabricados según la norma ISO 9001:2015
Más de 20 años de experiencia en fabricación.
Producción con certificación ISO desde 2003. Reductores de tornillo sin fin enviados a más de 60 países.
Soporte técnico remoto
Diagnóstico mediante videollamada en todas las zonas horarias de Australia. Respuesta rápida sin necesidad de visitas presenciales.
Personalización OEM/ODM
Ejes no estándar, orificios huecos, bridas y relaciones personalizadas. Posibilidad de consultar los planos completos.
Valor directo de fábrica
Sin margen de distribuidor. Precios transparentes por volumen con importantes ahorros en pedidos repetidos.
En stock y envío rápido
Bastidores NMRV/NRV estándar en stock en almacén. Pedidos urgentes tramitados para envío exprés.
Nuestros ingenieros están preparados para recomendarle el modelo de reductor de tornillo sin fin, la relación de transmisión, la configuración del eje y el sistema de montaje adecuados para su aplicación.
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