Hammer crusher

In the production process or when disposing of any production waste, it is often necessary to mill some raw material. Crushers are used for this purpose. According to the final fineness, crusher can be of large, medium and fine crushing.

Hammer crushers (hummer mills) are widely used for processing, crushing and grinding of soft materials, medium strength and fragility, which include chalk, gypsum, asbestos, coal and lignite, brick fight, marl, solid limestone, etc. They can also be used for grinding both plant materials and various production waste. But the natural moisture of raw materials should not exceed 8-10%. In addition, hammer crusher is not recommended for use in crushing viscous or sticky materials. Under these conditions, a crusher of hammer type may be used for both primary and secondary crushing to a size of 20 mm or finer material.

Single rotor hammer crusher is simple and reliable. The housing typically consists of two parts, upper and lower. Inside, housing is strengthened with lining plates. At the top, there is an opening for loading the material into the crushing chamber. Receiving hopper is attached here. The upper and lower housing parts together constitute the crushing chamber, inside of which rotor is assembled on the shaft of the disks. A rotor shaft receive torque produced by the engine, which is placed on the body frame. Hammers are hinged on the rotor disks. Hammers are sharpened or flat metal plates made of hardened tool steel. Lower part of the body has unloading (or grate) grid. The size of its cells sets the size of fractions of output crushed material.

Crusher motor rotates the rotor. When rotating, under the centrifugal force hammers are disposed radially relative to the rotor axis. The ground material through feed inlet of the hopper is fed continuously to the grinding chamber, where it is crushed by hammer blows, impacts and friction on the inner surface of the crushing chamber, and by hitting each other pieces and crushing or armor plate. The crushed material passes through the discharge holes of the grid, and then is fed into a hopper or onto a conveyor.

Hammer crusher is a continuous device, ie, its performance is determined by the quantity of material going through the discharge grid per time unit.
Structurally, hammer mills may differ in the first place by the number of rotor and hammers, way of fixing hammers, their location, form of liners. Also, by the rotor rotation type, crushers may be reversible and irreversible.

When selecting the type of crusher, the user must pay attention to a number of advantages such as ease of hammer mill and its sufficient reliability, low weight and compact construction, continuity of the work and, consequently, better performance, with low power consumption. To all the above, it should be remembered that impact crushing is more effective than smash crushing.

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