Hammer is the most important and easily worn working part of the crusher

At present, there are many hammer shapes used, but the most widely used is the plate shaped rectangular hammer. Because of its simple shape, easy manufacturing, and good versatility.

The utility model has two pin shafts, one of which has a hole in series on the pin shaft, which can be rotated to work with four corners. The working side is coated and welded with tungsten carbide or welded with a special wear-resistant alloy to prolong the service life.

However, the manufacturing cost is high. The four corners are made into trapezoids, corners and sharp corners to improve the crushing effect on forage fiber feed, but the wear resistance is poor. The annular hammer has only one pin hole, and the working angle is automatically changed during operation, so the wear is uniform, the service life is long, but the structure is complex.

Composite steel rectangular hammer is a steel plate with high hardness on two surfaces and good toughness in the middle, which is provided by the rolling mill. It is simple to manufacture and low in cost.

The test shows that the hammer with proper length is beneficial to increase the kilowatt hour power output, but if it is too long, the metal consumption will increase and the kilowatt hour power output will decrease.

In addition, according to the corn crushing test conducted by China Academy of Agricultural Mechanization with 1.6mm, 3.0mm, 5.0mm and 6.25mm hammers, the crushing effect of 1.6mm hammers is 45% higher than that of 6.25mm hammers, and 25.4% higher than that of 5mm hammers.

The thin hammer has high crushing efficiency, but its service life is relatively short. The thickness of hammers used should vary according to the size of the crushed object and model. The hammer of feed grinder has been standardized in China. The Ministry of Machinery Industry has determined three types of standard hammers (type I, II and III) (rectangular double hole hammers).