Since the hammer crusher has a simple structure and operation, does not require primary or secondary crushing, is formed in one step, is cheap, and has a low initial cost. However, the rotor hammer plate and end plate are easy to break, and it also requires investment to replace parts later.
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Relatively speaking, the price of impact crusher is higher than that of hammer crusher, and the initial investment cost is relatively high. However, it has a large crushing ratio, high crushing efficiency, strong interchangeability between parts, and fewer types of wearing parts, which reduces the occurrence of failures in the later working process. In the long run, impact crusher is also a good choice.
Through the above analysis, we hope that users can better understand the advantages and disadvantages of hammer crusher and impact crusher, and choose the equipment suitable for their own projects. If you still have doubts and don't know where to start, feel free to consult us.. We will arrange good engineers to answer your questions, design high-efficiency production lines, and select or customize high-efficiency equipment.
Drive and power components are important not only for budgetary reasons, but also due to line power restrictions from the utility company. Hammermill Crushers often require a 1:1 ratio comparing horsepower to tph throughput. That ratio can grow to 3:1 for many applications, and even 5:1 when fine-grinding is required.
Direct drive via a flexible coupling is often the choice, when and if a motor of the same rpm can be locally sourced and serviced. However, this limits the ability to change rpm in case of changes in material formation or product specifications.
V-belt drive arrangements are very common for smaller mills, offer the ability to alter the speed with a sheave change and may be set up with one or two electric motors.
Dual motor drives allow for smaller standard frame motors, which may be more available at lower, competitive prices. You may also save on operating costs if one of the motors is wired with a solid state reduced voltage starter. Peak amperage draw is kept at a minimum when starting the crusher with the reduced voltage starter. The second motor is engaged via across-the-line starter only after the crusher is fully up to speed. Utility companies often charge a premium for peak amperage draw.
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HammerMasters and LimeMasters are also available with replaceable tip hammers in lieu of the standard bullhead hammers. They are also offered with an optional feed chute to accommodate the conveyor feed.
Industrial Centerfeed Hammermills are also available with a trap mechanism located under the rotor at the central discharge point. This trap blocks the flow of material, forcing all the material to extrude through the grate openings. This trap also provides a relief for any tramp iron that may enter the chamber. A mechanical arm extends through the base frame to provide easy access when time to empty the trap, which is secured with a pivot pin and hinge.
Hydraulic access into the crusher is also available for the larger Industrial Hammermills. Not only can McLanahan offer hydraulic adjustment, the same hydraulic power unit can be used to open and close the access hatch for inspection and maintenance.
When a Hammermill is selected and recommended for a specific application, the crushing chamber with grates, impact plates and the hammers will be taken into account in the valuation of the Hammermill.
In most cases, the capacity of a Hammermill Crusher is based on the desired reduction ratio, the toughness of the material and the energy applied to accomplish the reduction. The diameter and width of the rotor assembly accommodates the top size of the feed and the surface area necessary to grind and extrude the ouput. The amount of energy applied will then result with a design capacity, which will always fluctuate with changes in the toughness or friability of the material. Essentially, for the Industrial Hammermills it is best to rely on the Bond Theory to determine necessary horsepower.
In the case of the HammerMaster and LimeMaster crushers, McLanahan has designed the crusher with rotor dimensions, shaft and bearings to handle a variety of applications at a specific horsepower rating. Since the power element is fixed, capacities can be pre-determined based on limestone and various reduction ratios.
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