Hazemag’s range of hammer mills is helping operators achieve the right product size across several applications.
With its wide variety of adjustable tools; grinding path to grinding wall heating, the Hazemag Hammer Mill is a versatile machine for all seasons.
The machine has been a long-standing part of Hazemag’s offering, with its primary uptake being in the cement, fertiliser and limestone industries as well as in other industries, including coal mining.
Teddy Craies, Hazemag allmineral’s managing director for Australia, said the hammer mill is helpful for many materials, including coal, shale, gypsum, glass, limestone, phosphate, potash, dolomite, lignite and clay.
Now, Hazemag envisages its hammer mill range having a big future in two of Australia’s key markets.
“The coal market and the quarry market, as well as those markets which are looking for finer products. It is used in some power plants and steel industries for secondary and tertiary crushing for various different materials, it works quite well for fine crushing,” Craies said.
“The thing with the hammer mill is the reliability and the product size. It gives you a very defined product size and product distribution, which is easy to access for maintenance and adjustments.”
In addition to its usage in traditional industries, the Hazemag Hammer Mill is expected to play a larger role in recycled materials in the future.
“With recycling materials coming up more and more, and the need to be more environmentally friendly and have a better environmental footprint … these machines will play a bigger part,” Craies said.
Hazemag has continuously innovated its hammer mills to ensure they remain up-to-date with modern technology to meet the needs of traditional and emerging industries.
Hazemag produces two types of hammer mills, with the main variance being the single rotor (Hazemag Unirotor) or the double rotor (Hazemag Novorotor). While both types can be used for fine grinding construction materials, the rotors provide subtle differences for the operator.
The HNM model from Hazemag has a double rotor, while the HUV and HUM models have single rotors. The double rotor in the HNM model provides operators with a machine with a higher capacity capable of processing more feed material at once.
A vital component of the Hazemag Hammer Mill is the disc-type rotor, to which the hammers are mounted. The hammers are free-swinging and able to swing 360 degrees. The steel disc design rotor is hard-faced for maximum life. The rotor is shaft-mounted and fitted with self-aligning roller bearings.
The dual-rotor HNM model has been used primarily for fine crushing or mill drying of materials, including gypsum, glass, limestone and clays. The dual rotors are non-reversible but can produce a better product fineness due to its two-stage reduction.
“With the dual rotor, the capacity is one thing, but you can also feed it laterally, which gives you dual-stage crushing. While your capacity will be a bit lower, you will gain dual stages and your reduction in size will be quite large if you go that way,” Hazemag and allmineral’s project and service engineer Jaco Botha said.
The single-rotor can be run in reverse, optimising the wear parts’ usage within the machine. Operators can also run the single-rotor models continuously or at variable speeds. This is because Hazemag has designed the HUM and HUV models’ mill housing with a symmetrical structure, enabling the rotor’s direction to be reversed.
“With the single-rotor models, you can reverse the rotors which helps provide the best life to the [hammer mills’] parts and wear parts,” Craies said.
“For any crusher, you want to protect the heart of it (the rotor with shaft and bearings), and you can get the maximum life out of the crusher and the hammer, with the hammers being able to rotate in both directions.”
The grinding paths can be equipped with an oil heating system. The system helps heat the impact walls, improving the material flow when the hammer mill is processing. This is useful when working with wet and sticky materials that contain moisture and tend to cake.
It works by pumping heat-conducting oil through the system, located behind the grinding path, to stop material caking and impacting material flow.
“The oil heating system helps with higher moisture applications,” Craies said.
“The grinding wall heating system helps to keep a stable process and also protects investment as well. Just having those heating walls and the grinding plate protects the whole crusher because it creates a better operating process.”
Hazemag can equip its hammer mills with different features depending on the application, including a direct drive, to help tailor the machine to the customer.
The direct drive benefits the customer by creating less slippage, less machine weight, and fewer maintenance requirements. It also requires less investment. The grinding path, which is casted, can be easily exchanged for maintenance.
“By doing these things, you’re getting a better life out of the machine. It adds to the safety factor as well,” Craies said.
With three hammer mill models in its portfolio, Hazemag can find the machine that best suits the operator’s application.
Hazemag maintains a comprehensive database of customers using Hazemag machinery in different global applications. This list provides Hazemag with a range of reference points that it can use to help find the best machine for a customer’s application based on past success stories.
The company will find the best fit for specific applications between its Australian team, led by Craies and Botha, and its team of German engineers. The Australian team can also conduct on-site testing, and the company can do material testing in Germany to select the suitable machine.
“Our hammer mills are versatile and from our experience, you get a good life out of it and the required product size, getting the required product distribution size consistently,” Craies said. •
For more information, visit hazemag.com
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