Sampling Hammermills

McLanahan Sample Hammermills, sometimes referred to as MiniMacs, are used in many applications that are similar to larger industrial Hammermill variants. These applications feature the crushing of low abrasiveness, moderately hard friable materials. The key difference is that Sample Hammermills are designed to process materials in applications that require smaller throughput capacities. This makes these smaller Hammermills well suited for incorporation into Sampling System and Pilot Plant projects. Like other Hammermills, these machines are also capable of a high reduction ratio and can generate a relatively high amount of fines in the crushed product. Sample Hammermills are available as stand-alone machines or as complete modular crusher and drive base assemblies for easy integration into larger material handling systems.

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Why McLanahan Sampling Hammermills

The McLanahan Sample Hammermill product line offers the dependable function and robust design that is typical of McLanahan equipment, in a compact Hammermill specifically designed to process smaller flow rates. These Hammermills offer a great deal of versatility in achieving crushed product output requirements through the use of numerous fixed and swing hammer designs produced from a highly effective, proprietary metallurgy, and a wide variety of crushing deck configurations. McLanahan also boasts extensive product history experience that allows for the ideal pairing of Sample Hammermill Crusher to application.

With an extensive range of sizes available, a Sample Hammermill can be selected to closely match the throughput requirements of any application, without the concern of overfeeding a smaller crusher just to avoid making the jump to a much larger (and more expensive) model size. This is particularly important in sampling applications where it is oftentimes important to match the rated capacity of the crusher to the sample flow rate in the sampling system to help minimise the air flow within the sampling system. Internal wear components can be easily reviewed and replaced through the main access door on the front of the machine or through other removable inspection and access panels designed into the machine.  

How Sampling Hammermills Work

Material to be crushed is fed into the downward portion of the Hammermill rotor. As the material enters the crushing chamber, it is impacted by crushing hammers. This initial impact fractures the incoming feed into smaller particles that can be drawn further into the crushing chamber. Once the material reaches the bottom of the crushing chamber, it is forced against crushing screens and further reduced in size by attrition. Final product size is controlled by the speed of the rotor and the opening size of the holes used on the crushing screens. Once material is crushed to a small enough particle size, it is discharged through the crushing screens and out the bottom of the Hammermill. If any hard or uncrushable material is encountered, it is propelled upward out of the crushing chamber where it comes in contact with a kick plate that directs it into a tramp collection pocket. A variety of both swing and fixed style hammer designs are available, depending on the material to be crushed and crushed product size requirements. 

Popular Applications for Sampling Hammermills

McLanahan Sample Hammermills most frequently are incorporated into sampling system applications due to their relatively low throughput capacities and closely matched throughput ranges between model sizes. These Hammermills are also commonly used in pilot or test batch plants, again for their relatively low throughput capacities but also for the flexibility in operation that they offer — final crushed product size can be altered by adjusting the rotor speed of the crusher, the design of the crushing screens used, and by the type of hammer selected. A number of Sample Hammermills have also been incorporated into laboratory applications.

Materials most often processed in Sample Hammermills include coal, coke, limestone, quicklime, potash, salt, phosphates and various agglomerated materials. Other material options also exist, such as agricultural feeds, caulk, bio-fuels and other wood products, and electronics circuit boards.

Benefits of McLanahan Sampling Hammermills

  • Multiple options for fixed and swing style impact hammers
  • Premium wear-resistant impact hammer metallurgy options
  • Reversible hammers to extend wear life
  • Wide range of crushing deck options for maximum flexibility in crushed product sizing
  • Removable drilled and tapped liners
  • Complete model range permits close matching of crusher to required feed rate
  • High reduction ratio crushing
  • Relatively fine crushed product gradations are possible
  • Metal trap

Frequently Asked Questions

What is the best way to feed material into a Sampling Hammermill?

Ideally, material to be crushed would be fed in a controlled fashion over the entire width of the Hammermill rotor by some type of Feeder (e.g. a belt conveyor). This method allows for the most consistent operation, crushed product, and wear life of components. In situations where a client may not wish to incorporate a feed conveyor, Sample Hammermills can be slug fed, but this has limitations with respect to the amount of material that can be presented to the crusher in one slug and usually requires additional motor power to prevent the crusher rotor from slowing. The best way to determine the right feed operation is to check with the equipment supplier to determine the best configuration and plan for operating a Sampling Hammermill in your application.

What range of flow rates can be processed by a Sample Hammermill?

Sample Hammermills are typically used to generate crushed product top sizes of 3/8” [10mm] down to approximately 2.38mm (0.0937”), or 8 US mesh. At this crushed product size, Sample Hammermills can be used to process feed rates of up to10.9 mtph (12stph). This assumes that the feed material is in good condition (e.g. not excessively moist).

What other technologies should I consider?

If the material to be processed in your application is very hard, contains large lumps of material, is abrasive, or is very moist, a Sample Hammermill Crusher is likely not your best choice. Other low feed rate crushing options do exist within the McLanahan family of products, however. For example, very hard or abrasive materials may be better processed using the Sample Jaw Crusher. Moist materials nearly always present much more of a challenge to crush, but other McLanahan options could include the Sample Double Roll Crusher/Mini-Sizer.