For Overland Copper Conveyors – Efficiently Replace Outdated European Brands

HelmeDrive H Series Heavy Duty Parallel Shaft & Shaft Mounted Gearbox for Overland Copper Conveyors – Efficiently Replace Outdated European Brands

Overland copper conveyors operate under extreme conditions. High belt tension generates substantial radial loads on the gearbox output shaft. Fine dust penetrates seals, causing frequent downtime. Many existing sites still rely on low-efficiency worm gear units or old-style cylindrical gearboxes with efficiency barely above 70%. Others struggle with discontinued European brands (Flender, SEW) where replacement parts are no longer available.

HelmeDrive H Series offers a modern, high-efficiency solution. This heavy duty parallel shaft gearbox and shaft mounted gearbox (hollow bore design) are engineered specifically for conveyor drive applications in mining. With efficiency ≥95%, forced lubrication option, backstop option, and enhanced sealing, the H Series can significantly reduce energy cost and unplanned stops.

This article provides a practical selection guide. We explain when to use a parallel shaft helical gearbox (solid shaft, foot-mounted) and when a shaft mount speed reducer (hollow shaft with torque arm) is the better choice.

1. The Core Challenge: Radial Load, Dust, and Efficiency

Copper overland conveyors often run 24/7 at long distance. The drive pulley experiences high belt tension, translating into an overhung load on the gearbox output shaft. Standard gearboxes may suffer bearing failure within

months.

🔹 High radial load capacity: H Series parallel shaft gear reducer features extra-heavy duty bearings and a rigid cast iron housing. Permissible radial load values are verified by ISO 281 bearing life calculation.

🔹 Dust ingress prevention: The standard configuration includes radial oil seals. For severe dusty environments, optional labyrinth seals (refillable with grease) are available – consult engineering.

🔹 Efficiency leap: Replacing an old worm gear (≈70% efficiency) with a helical parallel shaft gearbox (≥95% efficiency) can reduce annual energy consumption significantly. Actual savings depend on duty cycle, but the upgrade is

economically attractive.

2. H Series: Parallel Shaft vs. Shaft Mounted – Which One to Choose?

The H Series includes two main output configurations. The choice depends on your installation space and maintenance strategy.

2.1 Parallel Shaft Helical Gearbox (Solid Shaft, Foot Mounted)

●Typical model: H2SH, H3SH, H4SH (two, three, or four stages)

●Installation: Rigid foundation, foot-mounted, connected via flexible coupling to the drive pulley shaft

●Best for: New installations with ample space, high power (>200 kW), and where alignment can be precisely controlled

●Advantages: Easier to maintain, standard coupling replacement, lower initial cost for large frames

2.2 Shaft Mounted Gearbox (Hollow Shaft with Torque Arm)

●Typical model: H2SH with hollow output bore, or dedicated shaft mount speed reducer

●Installation: The hollow bore slides directly onto the drive pulley shaft. A torque arm prevents housing rotation. No coupling, no baseplate.

●Best for: Space-constrained retrofits, mobile conveyors, or when you want to eliminate coupling alignment issues

●Advantages: Compact, lighter, lower installed cost, direct drive to pulley

When is a hollow shaft gearbox NOT needed?

For the copper overland conveyor described in this article (long distance, high power, accessible foundation), a parallel shaft helical gearbox with solid shaft and flexible coupling is generally preferred. It allows easier future

replacement of the gearbox without disturbing the pulley shaft. However, if the conveyor is located in a narrow tunnel or on a mobile stacking unit, the shaft mounted gearbox with torque arm becomes the better solution. Consult

HelmeDrive engineering for case-by-case advice.

3. Core Technical Specifications of H Series

4. Upgrade & Replacement Opportunities

Many copper mines operate legacy gearboxes from European brands that are no longer in production. Replacement parts are expensive or unavailable. HelmeDrive H Series offers a practical alternative.

🔹 Dimensionally compatible: HelmeDrive can provide mounting dimensions (foot position, shaft center height, bolt hole pattern) that match common industry standards. In many cases, direct replacement is possible without

modifying the foundation or coupling. Consult engineering with your old drawing.

🔹 Higher torque density: For the same center distance, HelmeDrive H Series delivers higher output torque compared to older designs. This allows you to upgrade power without increasing gearbox size.

🔹 Energy saving: Replacing an old worm or helical gear unit with efficiency below 80% with HelmeDrive H Series (≥95%) can cut electricity consumption significantly. The payback period is often less than one year for continuously

running conveyors.

🔹 Availability: HelmeDrive maintains a modular stock program. Lead times are predictable. Spare parts (bearings, seals, gears) are readily available globally.

5. How to Select the Right H Series Gearbox for Your Conveyor

Follow these steps.

✅ Step 1: Calculate required ratio

i = n1 (motor speed) / n2 (pulley speed)

✅ Step 2: Determine required power

PC = P2 × f1 × f2 × Sf

where f1 = driven machine factor (conveyor: moderate to heavy shock), f2 = prime mover factor (electric motor = 1.0), Sf = safety factor (1.3 – 1.6 depending on consequence of failure)

✅ Step 3: Select gearbox size from rating table

Choose a size where nominal power PN ≥ PC.

✅ Step 4: Check peak torque (starting, braking)

TA (max input torque) × n1 / 9550 × f3 ≤ PN

✅ Step 5: Verify thermal capacity without/with auxiliary cooling

Use PG1 or PG2 tables with ambient temperature and load cycle factors. If required, specify forced lubrication with oil cooler.

✅ Step 6: Specify options

●Backstop (if non-reversing is required, e.g., inclined conveyor)

●Forced lubrication system (recommended for high ambient temperature or continuous duty)

●Hollow shaft (shaft mounted) or solid shaft

●Torque arm (for hollow shaft version)

6. Case Example: Upgrading a Copper Conveyor in South America

A copper mine in Chile had two overland conveyors driven by outdated European helical gearboxes (discontinued model). Frequent seal leaks and bearing failures caused 4 hours of unplanned downtime per week. Energy

consumption was high due to aged internal clearances.

HelmeDrive proposed replacing them with H3SH parallel shaft helical gearboxes of equivalent center distance. The new units included:

●Forced lubrication with external oil cooler

●Backstop on the high-speed shaft

●Heavy-duty output shaft seals (with dust lip)

After installation, the conveyor availability increased to 99.5%. Energy consumption dropped by 32% (metered). The mine has since standardized on HelmeDrive H Series for all new conveyor drives.

7. Conclusion

For copper overland conveyors, the HelmeDrive H Series heavy duty parallel shaft gearbox and shaft mounted gearbox deliver reliable, efficient, and maintainable power transmission. Whether you need a parallel shaft helical gear

reducer for a long-distance conveyor or a hollow bore gearbox for a space-limited retrofit, HelmeDrive offers a compatible, high-performance solution. Replacing obsolete European brands is straightforward with HelmeDrive’s

dimensional compatibility and higher torque density.

📞 Contact HelmeDrive technical sales for selection support, retrofit drawings, and a customized quotation. 

�FAQ

Q: Can I directly replace an old Flender or SEW parallel shaft gearbox with HelmeDrive H Series without modifying the foundation?

A: In most cases, yes. HelmeDrive can supply units with matching foot dimensions, shaft center height, and hollow bore diameters. Provide the old drawing or model number, and our engineering team will verify compatibility. This is a replacement, not a downgrade – torque density is typically higher.

Q: When should I choose a shaft mounted gearbox (hollow shaft) over a foot-mounted parallel shaft gearbox?

A: Choose a shaft mounted gearbox with torque arm when space is limited (no room for a coupling and baseplate), or when you want to directly mount the gearbox onto the drive pulley shaft. For long, high-power overland conveyors with easy access, a foot-mounted parallel shaft gearbox is usually simpler to maintain. If you are unsure, consult HelmeDrive with your site layout.

Q: Does the H Series require synthetic oil for low-temperature starting?

A: Standard mineral oil (ISO VG 220/320) is suitable for ambient temperatures between -10°C and +40°C. For starting below -10°C, an electric oil heater or synthetic PAO oil is required. These are optional. Consult engineering for cold-climate projects.

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