Caja de engranajes helicoidales para sistemas de cintas transportadoras

Caja de engranajes helicoidales para sistemas de cintas transportadoras

Belt conveyors are the circulatory system of Australia’s mining and bulk-materials industry, moving millions of tonnes of coal, iron ore, grain, and mineral aggregate every year. Behind every reliably running conveyor is a precisely selected drive unit — and the caja de engranajes de tornillo sin fin has earned its dominant position through a combination of self-locking geometry, compact right-angle output, and robust high-torque delivery.

The self-locking characteristic is particularly critical on inclined conveyors: when power is removed, the irreversible worm geometry prevents the loaded belt from reversing under gravity. This eliminates the need for a separate backstop or motorised brake on many installations, simplifying the mechanical design and reducing maintenance exposure.

Standard NMRV and NRV series aluminium or ductile-iron worm gearboxes are available in frames from 025 to 150, providing output torques from 2.6 N·m up to 4,200 N·m and reduction ratios from 5:1 to 100:1 in a single compact stage. Two-stage tandem configurations extend this to 3,600:1.

Aplicaciones y casos de uso en la industria

In a typical belt conveyor drive arrangement, the caja de engranajes de tornillo sin fin sits between the electric motor and the conveyor head drum. Key application points include:

• Head-end drive units on horizontal conveyors — steady torque, self-lock on stop
• Inclined conveyor drives — self-locking prevents roll-back under loaded belt weight
• Take-up winch drives — precise low-speed tension control on counterweight systems
• Belt weigh feeder drives — accurate, vibration-free low-speed output

Materials: Worm shaft in surface-hardened alloy steel 20CrMnTi (HRC 58–62). Worm wheel in centrifugally cast phosphor bronze. Housing in ductile iron GGG40 with IP65 dust-and-jet-water sealing.

Working principle: The helical worm thread engages the bronze wheel teeth at 90°. Back-driving from the wheel side is geometrically prevented when the lead angle is below the friction angle — this is the self-locking mechanism at the heart of safe conveyor operation.

Especificaciones técnicas y guía de selección

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.

► 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%.

Normas de cumplimiento y calidad

Estudios de caso

¿Por qué elegirnos?

Preguntas frecuentes