Application
Double-shaft hammer crushers are used mainly in the cement industry for the comminution of soft to medium-hard, but also moist and tough materials: Limestone, Gypsum, Chalk, Clay andMarl,
as well as Lignite and Pit Coal. The crushing of the feed material is effected by percussion, impact and shear forces.
Equipment
Two counter-rotating rotors crush feed material of up to 2.7 m3 edge length. Located centrally between the two rotors is an anvil which directs the processed material onto grate baskets. These grates, which serve to restrict the amount of oversize, are mounted on a grate carriage and can be completely withdrawn from the crusher housing for servicing and maintenance purposes.
Rotor
The rotor body together with shaft and bearings forms the „heart“ of the hammer crusher. Each rotor comprises a central shaft onto which discs are affixed. Between the discs, free-swinging hammers are mounted on hammer bolts extending over the full width of the crusher. Turning and replacement of the hammers is facilitated by a hydraulic hammer bolt removal device together with a special lifting tool.
Method of operation
The feed material is processed in three stages:
1) The first stage is effected by percussion and impact as the material is gravity-fed into the tip circle of the hammers
2) The material then passes onto the anvil located centrally between the rotors, where it is crushed further by percussion and shear forces.
3) The material flow is spread over the following discharge grates, where the product granulometry is separated and discharged through the grates. Any remaining material continues to be processed until it, too, can pass through the grate gap. The grate bar gap spacing determines the end product size.
Assembly aids
HAZEMAG HDS-type hammer crushers are provided with a rotor turning device, by means of which the rotors can be moved and locked in the appropriate position for hammer changing. For hammer changing, the hammers are fitted into a holding device and secured in position. With a hydraulic aid, the hammer bolts can then be extracted and/or inserted. The use of a grate carriage enables the grates to be withdrawn from the crusher housing and returned to their original position afterwards.
Special features
+ machines have excellent accessibility to facilitate servicing and maintenance work and thus minimise down time. Moreover, the tools and personnel required for such tasks are reduced to a minimum.
+ The crusher housing is lined with handy and easily replaceable wear plates.
+ All hammer crushers are fitted with a key transfer system, which prevents unauthorised opening of the housing during operation and prevents motor start-up whilst work is being carried out on the open crusher.
+ The modern and generously-equipped fabricating facilities in the Dülmen works guarantee machines and products of the highest quality.
+ Installation, repair, modification and assembly work is carried out by highly-trained and experienced personnel, if necessary in shift work around the clock. Naturally, as part of the service, offers contracts for after-sales inspection as well as for the acquisition of spare and wear parts