Hazemag has evolved its sizer across five decades. Image: Hazemag
Hazemag’s range of sizers can deliver in all conditions to keep production running. Quarry looks at their possible applications in Australia.
Quarrying can be challenging during the winter as operators deal with arduous conditions.
Having the right equipment to deal with wet conditions can ensure quarries maintain uptime. Teddy Craies, Hazemag allmineral’s managing director for Australia, said the company’s sizers have proven itself in these operations, including markets like Indonesia.
“It works well because in the rain seasons, you have a lot of clay, and when you have a lot of clay, and it’s wet, it is difficult for many crushers to perform efficiently like an impact crusher and others because, with that type of material, it gets clogged easily,” he said.
“This (sizer) is meant for sticky material; it has the scrapers, and it works by working through that wet, sticky material.
“Even here in Australia during the winter, quarries can deal with a lot of wet and sticky material, but that is where the sizer works well.”
The sizers use two toothed rolls, which run towards each other, producing continuous pressure on the material while maintaining a smooth operation. The crushing rolls turn at low speed but with high torque as the material gets deeply immersed between the rolls and punctuated with force.
Each section has its own scraper to remove sticky material, reducing maintenance time and ensuring more crushing time.
Their design makes them ideal for applications dealing with sticky materials such as clay, where fines need to be limited, or on sites where height is a concern due to their low profile.
Hazemag’s sizers have become quite popular in Indonesia, where operators use them in coal mining and limestone applications. Here, the Hazemag sizers shine as a primary or secondary crusher on soft to medium-hard materials.
“It works well and is low-profile, so it can get to areas where you can’t use a jaw crusher. It fits in quite well when you have an issue with space,” Craies said.
“The operating cost is low; it is very energy efficient. We have options where the customer can have different kinds of teeth made for different applications.
Hazemag understands quarries prioritise uptime where possible, so its sizer has been developed to function with minimal maintenance. It is equipped with the standard Hazemag motor, an off-the-shelf option enabling the company to provide replacements quickly.
The old method of sizer maintenance saw operators working with copper hammers to remove the teeth, which was labour-intensive and time-consuming. The Hazemag sizer’s teeth can be removed easily through its hydraulic system. Hazemag estimates the whole process can be done in a 12-hour shift, compared to the week-long process of some sizers.
All of the Hazemag sizer rolls can be fixed in position to allow safe maintenance practices to be carried out. The track roll lifting device makes the roll retraction into the maintenance position easy and gives operators access to the sizer and its internal parts. For applications where tramp metal is a concern, Hazemag has simplified the process of removing foreign material.
Hazemag’s sizer excels when dealing with sticky materials. Image: Hazemag
The drive system has a motor with a fluid coupling gear designed to disconnect when foreign metal is detected. The disconnect stops the motor on the rollers and prevents damage to the machine.
“Each supplier is different with their sizers. You have to take the crusher out (of production) and hammer all the segments out, and that can take days,” Craies said.
“And as well as the cost of time to do that, there is a safety factor. With our crusher, you can do it in situ. It is quick, and we give you all the tools as well.
“And it saves the cost of having another crusher on standby as well because you’re able to do this change in one shift, so downtime is reduced, and the safety is really good.”
According to the company, the low-profile nature of Hazemag’s sizer can suit crushing systems where height restrictions are a concern.
Hazemag has spent the past five decades innovating its sizer to be among the best in the quarrying market. The company has invested heavily in testing the product with customers to track its performance with clay materials to ensure it will perform when quarries need it most.
“We look at the customer’s specified cubicle product, and we can then use the right tools and the right settings to achieve that for the right result,” Craies said.
“If they need it for different applications, for example, roadbuilding, or their customer who receives the product has specific needs, we’re making sure the sizer produces the right product.
“With our sizer, you get a trouble-free operation.” •
For more information, visit hazemag.com
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