Hammer Crusher: Classification, Common Failures and Solutions

3/27/2012 5:25:59 PM

Classification

Hammer crusher can be divided into: single-section hammer crusher, high-efficiency hammer crusher, sand maker, vertical shaft hammer crusher and reversible hammer crusher. 

Single-section hammer crusher 

Single-section hammer crusher belongs to heavy hammer crusher, and is also called compound hammer crusher, mainly used in limestone crushing. Large single-section hammer crusher has strong crushing capacity, which can directly break limestone of 1meters in diameter to about 20mm, thus it widely applied in cement industry.

High-efficiency hammer crusher

High-efficiency hammer crusher is important equipment in fine crushing field and mainly used for material fine crushing. Making PX high-efficiency fine crusher as an example, hammer head is with split structure, which makes replacement convenient; Hammer head and handle are connected by bolt. Hammer head materials adopts Cr Mo alloy of high wear resistance whose wear-resisting performance is best among hammer crushers.

Sand maker

Sand maker is the most traditional type of hammer crusher, whose hammer head is directly connected to rotor through the rod. In order to avoid the breaking of hammer head, head material hardness cannot be too high. Therefore, its hammer head wear-resistant cycle is shorter than high-efficiency hammer crusher. 

Vertical shaft hammer crusher

Its advantage of no-plate structure makes it avoid blocking phenomenon. But its crushing effect is slightly lower because hammer head and liner plate cannot form large angle counter process. The hammer head is an integral-structure one, so the repair and maintenance are complex.

Reversible hammer crusher 

Mainly used in soft materials and low abrasive material fine operation. The rotor has movement skills to positive and negative direction, which can greatly improve the hammer use cycle and reduce replacement frequency of hammer head. 

Common faults and Solutions

Hammer crusher undertakes larger torque or vibration during operation, which often results in transmission failure, common faults are: the wearing in bearing chamber and bearing, abrasion on belt wheel hub, shaft, keyway, etc. 

The traditional method to repair primarily by welding or brushing, but both them have drawbacks: welding thermal stress by high temperature cannot be completely eliminated, which cause material damage or lead to part appears to bend or break; and brush plating is limited by coating thickness, so it is easy to peel, and above two methods are used in repair metal by metal, cannot change the relations of " hard to hard", will cause wear again under the comprehensive roles. 

Such repair method has become less common in western countries. In view of the above problems, Europe, the United States and other countries contemporarily are tend to use polymer composites repair method, the most mature application is 1st line technology products, it has strong adhesion, excellent comprehensive properties, free disassembly and can be repaired on spot. Polymeric materials repair won’t make thermal stress influence, and no repair thickness limitation, at the same time, deformability that metal materials do not have can absorb the equipment’s shocking and vibration, avoid to wear again possible, and greatly prolongs the service life of the parts of equipment, save a large amount of downtime, creating huge economic value for the enterprise.