What is the correct installation angle for a primary belt cleaner at the head pulley?

Answer:
⏱️ There is no reliable universal “months of life” figure for a mining belt cleaner. Service life can vary significantly depending on tonnage, abrasion, belt speed, pressure, blade volume, operating hours and material chemistry.

A better KPI is:

Blade life = operating hours / conveyed tonnes / usable wear consumed.

For example, compare two blade sets by recording:

• installation date
• operating hours/day
• tonnes/hour
• total tonnes conveyed
• initial usable blade height
• remaining wear height
• cleaning efficiency
• number of re-tensioning events

If a new blade gives 30% more calendar life but the conveyor tonnage doubled, the blade may actually be performing significantly better than the calendar suggests.

For OEM selection, ask the supplier for the usable wear length, compound, hardness, temperature rating and recommended belt speed—not just “expected months.”

This approach is especially important for iron ore, granite and other abrasive materials because production tonnage can vary dramatically between sites.

Answer:
🛠️ Use the minimum controlled pressure that produces stable cleaning, and set it according to the cleaner manufacturer’s tensioning specification.

More pressure does not automatically mean a cleaner belt. Excessive tension increases friction, blade temperature and wear and can accelerate belt-cover damage. Too little tension is also harmful: material can pass or wedge between the blade and belt, creating streaks and uneven wear.

As a general engineering reference, low-pressure elastomer pre-cleaners may operate around 14 kPa (about 2 lbf/in²) blade-to-belt pressure, but many commercial tensioners are adjusted by spring length, torque, indicator marks or a specified dimension rather than by directly measuring pressure.

After installation, look for:

• uniform contact across the cleaning width
• no chatter or bouncing
• no excessive blade deflection
• no hot spots or burning smell
• minimal carryback downstream
• even wear across blade segments

If you constantly need to re-tension the cleaner, investigate the mounting geometry, spring/torsion unit, belt vibration and blade compound.

A correctly designed spring, torsion or pneumatic tensioner should accommodate normal blade wear while maintaining useful contact.

Answer:
⚙️ A primary or pre-cleaner is normally installed on the face of the head pulley, just below the material trajectory after discharge.

This position matters because the belt is supported by the pulley while the scraper contacts it. The scraped material can also fall back into the main discharge stream instead of accumulating along the return conveyor.

Do not choose the mounting point only because there is convenient steelwork nearby. The correct location depends on:

• head-pulley diameter
• belt thickness
• cleaner blade geometry
• discharge trajectory
• chute clearance
• pole/mainframe position
• tensioner travel
• access for future blade replacement

A common installation mistake is mounting the cleaner too far from its designed pivot location. The blade may look correct when new, but the contact angle changes badly as it wears. Cleaning efficiency then drops and maintenance personnel compensate by adding excessive tension.

Before fabrication, obtain the cleaner’s dimensional installation drawing and verify it against the actual head pulley.

A photo, belt width and pulley diameter are helpful, but site dimensions around the chute and mainframe remain essential.