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McLanahan offers a wide selection of Impact Crushers for quarried limestone and semi-abrasive minerals. McLanahan draws from the 75 years of field experience with the Universal line of Impactors, which includes impact breakers and Andreas-style impactors. At present, we offer the New Holland-style primary impact breaker and the MaxCap X-Series Primary, providing a means to reduce quarry shot and ROM materials at rates exceeding 2,000 tph. We also offer VersaCap P-Series Impactors for heightened portability as a primary crusher. The VersaCap R-Series is also designed to accept large top size in highly friable materials, and will allow for single crusher reduction to 1-1/2” minus product. In the case of limestone and similar materials, we offer the NGS Impact Crusher as a secondary impactor, which is capable of producing construction grade aggregates or minerals of like size. These five lines of horizontal shaft impactors are available in multiple sizes to provide us the ability to offer the most appropriate crusher for your specific application. 

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High Performance Crushers

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ZI Cone Crusher | THE STORIES

The crushing liners for crushing materials with various characteristics efficiently are manufactured at EARTHTECHNICA's own foundry, which is one of the largest ...

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Oct 28, 2021 · There are different types of stone crushers in mining industry such as jaw crusher, cone crusher, impact crusher, and sand making machine. This article will tell you how to maintain the 4 types of rock crushers and how to efficicently improve their performance. How to make your crushers efficiency

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The new eccentric roll crusher (ERC®) boosts efficiency in mining operations. For the mining industry, competitiveness is about having efficient and ...

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Jun 28, 2021 · Factors Affect The Crushing Efficiency Of Stone Crusher (1) Hardness of raw material. The hardness of raw material is a very important factor that affects the crushing efficiency of stone crusher. As we know, the harder the raw material is, the more difficult to crush, which will lead to the low crushing efficiency of stone crusher.

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Efficient use of cone crushers

Efficient use of cone crushers ... A cone crusher is often used in the second to third crushing stage and operates according to the pressure crushing principle.

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Jam Vision: Increasing Mine Crusher Efficiency Through

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Factors Affect The Production Efficiency Of Stone Crusher

During the production process of stone crusher, the crushing efficiency is not only affected by its performance, but also affected by ...

Crusher Efficiency Determination | Crusher Mills, Cone

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In the study, the loading efficiency of rope shovels was correlated to the energy consumption and throughput of a gyratory crusher.

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Efficiency of a multiple stage crushing plant can be maximized by operating a primary crusher at a setting which produces a satisfactory feed size for the secondary crusher and operating the secondary crusher (or the last stage crusher) in a closed circuit.

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Crushing of coal and calculation of size reduction efficiency

Feb 25, 2015 · Roll Crusher • The reduction ratio and efficiency of roll crusher is very low. • The main advantage associated with roll crushers is small proportion of fines produced and more uniform size of product crushed, than the other crushers. • Low capacity • Low reduction ratio = F/P • Sensitive to top size 2/25/2015 6:58:05 AM 38 39.

Zenith High-Efficiency Hydraulic Cone Crusher (HP-200)

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Frequently Asked Questions

If I am trying to reduce my fines in a limestone quarry, should I use a Jaw Crusher instead of a Primary Impactor?

While it is true the Jaw Crusher will create less fines (say, minus 3/16”), it also creates more plus 1-1/2” material to be crushed downstream at the secondary and tertiary stages. Regardless of the type of crushers used downstream, the amount of fines generated in those closed circuit operations will actually be greater than any increase caused by a primary impactor. 

How do the power consumption figures compare between Primary Impactors like the MaxCap and the VersaCap?

Since one employs an expansion chamber over the rotor and the other doesn’t, the MaxCap will perform at ½ hp per ton, while the VersaCap averages ¾ hp per ton. Electric motors will only draw as much power as the crusher needs. However, the theoretical difference in a 500,000-ton quarry or mine is about 90,000 kW/hours. That reflects only the primary crusher, not the added power it takes downstream to also recirculate 30% more rock through the secondary circuit.

Why do I see so many Impact Crushers in concrete recycling when the material is 100% abrasive?

Unlike sedimentary stone, e.g. limestone or sandstone, weathered concrete is very soft and friable. Most concrete pavement is less than 1,500 psi and pre-broken into slabs 2’ to 3’ square.  Due to the friability, they shatter quickly into particles 3” and smaller on the initial pass through the impactor. The hammer wear life tends to be far shorter due to the abrasion, but recirculating loads are minimal for base material. In the case of a mobile contractor, single crusher systems are far more economical when relocating on a regular basis. 

What is the main difference between the VersaCap P-Series and the R-series? Are they both primary impactors?

Yes, they are both primary impactors. In fact, the only real difference is the rotor assembly. The VersaCap P-Series is a primary impactor that accepts 30” boulders in quarried stone, and generates a nominal 6” minus. The VersaCap R-Series uses the same housing, but the rotor is designed specifically for large, highly-friable materials like concrete rubble. In the case of recycling concrete, the R-Series rotor is lighter in weight for portability, and the hammers are thinner, reducing the cost of spent hammers. 

Under what circumstances should I consider automation for adjusting an Impactor?

The MaxCap Primary Impactor comes standard with fingertip control. While not fully automated, it is designed to integrate into any programmable logic controller based system. As for the other impactors, the vast majority of operations will be fine with a simple shim adjustment, which requires no automation. However, the semi-automatic system on the VersaCap and NGS Impactors essentially requires only an electrical control over the hydraulic system, which would be running during operation. Once you find the right setting, and plan to stay consistent, you can add shims, and shut off the hydraulic power unit. If you are anticipating the need to change settings on a regular basis, the full automation system with PLC and touch screen is available and capable of being integrated.