The development history of crusher‘s hammer head

Foundry industry in China, the number of employees. And in the crusher parts field is involved in the layers of repeated, talented people.

Crusher hammerhead of the last century

Hammer head as the "heart" of hammer crushing, its working place is arranged on the hammer shaft of the crusher rotor, and directly hits the material when the hammer crusher operates.

Before 1970s: ordinary white cast iron, wear-resisting nodular cast iron. After 1970s: in the cement industry to develop a number of new dry production lines, reliable wear resistance of high chromium cast iron has become a popular; In the 1980s, high chromium hammer made breakthrough progress, low chromium, medium chromium, high chromium cast iron was born and put into production in large quantities. High chromium cast iron and steel bimetal composite cast iron are also used successively. In 1999, GB/T8263-1999 "Wear resistant white cast iron" was formulated.

The evolutionary history of the crusher hammer

In recent years, high chromium hammer technology has emerged endlessly, and ductile cast iron of martensite matrix, Au-B matrix and ma-B matrix has been developed successively. Our country independently developed manganese white wear-resistant cast iron, boron white wear-resistant cast iron, tungsten white cast iron. Them in the laboratory mill lining board and application are slurry pump, heavy hammer crusher again instead of hammer crusher, jaw crusher, counterattack crusher and impact crusher, hammer crusher in the market to the masses of users has been review good, heavy hammer crusher not only yield high, function, and slow the abrasion of the bimetal hammer. Reversible hammer crusher is commonly used in coal mine, metallurgy, mining, building materials and electric power industries. Hammer head is one of the main easy to wear parts, currently mainly made of high manganese steel, but its poor wear resistance, short service life, the need for frequent replacement, which not only wastes manpower and financial resources, but also affects the normal work. Therefore, it is a thorny problem to improve the life of hammer head.

The working principle of hammer crusher

The materials fall INTO THE crushing chamber from the feeding mouth and collide WITH the high speed rotating hammerhead. The crushed materials hit the grate with a certain gap at a high speed. The materials with larger granularity are broken repeatedly, and the fine materials meeting the requirements are eliminated through the grate gap.

Hammer head failure analysis

Hammer head during the work, in addition to the impact, but also by the material erosion, so long-term repeated use, hammer head working face will be destroyed, the surface shape changes.

If used in a reversible crusher, the edges and corners on both sides of the hammer will be ground into a smooth circular arc surface. When the surface shape of the hammer head is not changed at the beginning of the work, the hammer head is mainly affected by impact wear, and the material impacts the metal surface with positive force to produce plastic deformation and impact crater. When the working face of the hammer head is ground into an arc, the force on its surface changes, the former has an impact on the hammer head, and the latter causes cutting and flushing on the hammer surface. Although the impact of the material can produce a certain amount of additional sclerosis, but the impact is not enough to make the hammer head working face to form a solid hardening layer, resulting in the wear resistance of the hammer head is not enough, making the hammer head in the early work failure. Therefore, increasing the hardness of hammer head can improve its wear resistance, thereby reducing impact wear; Improving the toughness of the material can help crack generation and propagation, and reduce erosion and wear. Therefore, the choice of coherent materials is the basic way to improve the life of hammer head.

At present, the main hammerhead types in the domestic market are forging hammerhead, high manganese steel hammer head, high chromium alloy hammer head, hard alloy hammer head, manganese steel hammer head is widely used in the country at present, its shortcomings are more obvious, wear resistance is not enough, the service life is very short, huge amount of consumables. In the domestic market, the existing bimetallic hammer head is a high chromium alloy base head.

<<Previous： The difference between hammer crusher and toothed roll crusher
<<Next：none