Screening and crushing: Sanland impact crushers

Sanland Equipment has a growing local stock of high-quality wear and spare parts to service more than 50 different makes and models of impact crushers

Proper ceramic wearing

In construction and quarrying, the impact crusher stands out for its versatility and efficiency. Intriguingly, New Zealand has been quicker to adopt these machines on a larger scale than other markets, likely because of their adaptability for both shaping and sizing material.

However, misuse of impact crushers leads to higher operational costs, mainly from poor awareness about appropriate set-up and wear part selection.

While purchasing an impact crusher may seem cost-effective initially, inadequate understanding and management can lead to exorbitant lifetime expenses.

Impactor blow bars

For owners of horizontal shaft impactors crushers (HSI), the most important wear parts are the blow bars and apron bars. The two most popular types of casting to choose from are martensitic steel and high chrome.

Martensitic steel is a common selection for operators crushing concrete or primary crushing, due to having a good balance between impact resistance, wear resistance, and cost.

High chrome is significantly harder than martensitic steel and is recommended for harder rock and abrasive environments.

However, as the metal becomes more wear-resistant, it’s also more brittle, making it less resistant to impact, which is a trade-off each customer must consider, as impact resistance is important for operators that may have steel or oversized material entering the impactor.

To further enhance the abrasion resistance, ceramic inserts can be embedded into the bars to further extend the life of the blow bars, in some cases up to twice the life.

The apron in the impact feeder is a high-wearing part of an impact chamber, and often there are limited options for configuration and in some instances, must be replaced entirely due to wear in one area.

Wear plate apron

Sanland has developed aprons with replaceable apron wear plates for impactors with high-wearing aprons. This makes maintenance significantly easier, helps produce a more consistent product, and removes the need to replace a critical part.

For the Vertical Shaft Impact (VSI) crusher owner, they most probably use a rock-on-rock configuration where the material is broken on itself (attrition).

An alternative set-up is the rock-on-metal or anvil ring approach, which performs particularly well in achieving higher reduction ratios and is more effective for certain products, such as small pea metal.

The rock-on-rock set-up was initially developed to minimise anvil wear. However, with today’s advanced casting and ceramic technologies, Sanland has engineered long-lasting anvil ring set-ups that are a preferred choice for some operators.

With a growing local stock of high-quality wear and spare parts to service more than 50 different makes and models of impact crushers in New Zealand, a second opinion is available from Sanland Equipment who can advise on the best impact parts for varying applications.

For more information, contact 09 296 9488 or visit

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