Worm Gear Reducer for Mining Crushers

Worm Gear Reducer for Mining Crushers

Mining crushers — jaw crushers, cone crushers, and roll crushers — represent some of the most mechanically demanding environments in heavy industry. They impose extreme impact loads, high starting torques, and continuous vibration on every drive component. The redutor de engrenagem helicoidal deployed in crusher auxiliary and feeder drives delivers high reduction ratios in a compact envelope, ensuring full drive torque from a standard motor frame even in the space-constrained confines of a mine shaft or processing plant.

While the primary crusher drive may use a direct-drive or fluid coupling arrangement, worm gearboxes serve critical roles in the crusher circuit: driving the vibrating grizzly feeder that regulates ore feed rate, actuating the CSS adjustment mechanism, driving the lubrication oil pump motor on large gyratory crushers, and controlling the apron feeder beneath the jaw crusher discharge.

In all these roles, the worm reducer’s defining advantage is torque multiplication at compact size — reduction ratios up to 100:1 from a single stage allow a small motor to overcome the starting inertia and shock loads characteristic of crusher circuits.

Aplicações e casos de uso na indústria

In a typical crusher plant layout, worm gearboxes appear at multiple points in the circuit:

• Vibrating grizzly feeder drives — eccentric mass adjustment and feed rate control
• CSS adjustment actuators on cone crushers — precise low-speed setting changes under hydraulic load
• Apron feeder drives beneath jaw crushers — high starting torque against loaded apron pans
• Roll crusher drives (secondary stage) — low-speed high-torque direct drive of crushing rolls
• Lubrication pump drives on large gyratory crushers — slow continuous pump rotation

Material specifications for crusher duty: Worm shaft in carburised-and-quenched alloy steel (HRC 60–62). Worm wheel in special alloy bronze with higher tin content for improved impact resistance. Housing in ductile iron GGG40 with IP65 sealing as minimum — IP66 recommended near crusher discharge zones where water-and-fines slurry splashing is common.

Shock load and service factor: Crusher circuits are classified as heavy-shock applications with service factor SF=1.75–2.0. This means the gearbox must be selected with a rated output torque at least 1.75× the calculated application torque. Undersizing a worm gearbox in a crusher circuit leads to premature bronze wheel wear and thermal overload.

Especificações técnicas e guia de seleção

Utilize a tabela abaixo para identificar o modelo apropriado. Os principais parâmetros incluem relação de redução, torque de saída, dimensões do eixo e material da carcaça. Sempre aplique o correto Fator de Serviço (FS) para o seu ciclo de trabalho.

► Fator de Serviço (FS): Carga uniforme SF=1,0 | Choque moderado SF=1,25–1,5 | Choque pesado / 24 h contínuo SF=1,75–2,0

► Temperatura ambiente: Unidades padrão com classificação de -10°C a +40°C. Locais com altas temperaturas ambientes na Austrália (>45°C) exigem lubrificante para altas temperaturas e redução térmica de acordo com a norma 15%.

Caixa de engrenagens helicoidais da série NMRV / NRV

Disponível nos tamanhos de carcaça 025 a 150. Relações de redução de estágio único de 5:1 a 100:1. Torque de saída de até 4.200 N·m. Carcaça em alumínio ou ferro fundido nodular. Flange do motor IEC B5/B14. Grau de proteção IP65 padrão, IP66/IP67 opcional. Lubrificação com óleo sintético ou mineral.

Padrões de Conformidade e Qualidade

Estudos de caso

Caixas de engrenagens helicoidais da série NMRV / NRV — tamanhos de estrutura 025 a 150, fabricadas de acordo com a norma ISO 9001:2015.

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