Some main factors affecting the efficiency of hammer mill

Jun. 17, 2021

In the feed production, about half of the raw material needs to be grinded. Then knowing about the main factors that affects the hammer mill, can same energy consumption, raise productivity and reduce cost, increase benefit for company.

1、Moisture of raw material

Taking corn as an example, some data show that when the water content of corn increases, the crushing efficiency decreases significantly and the power damage increases correspondingly. Therefore, in order to ensure the improvement of grinding efficiency, it is recommended to control the moisture content of raw materials at 13%.

2、Shape and width of grinding chamber

Circular hammer mill results in low efficiency, because of the existence of circulation layer of materials. So the use of non-circular hammer mill is one of the measures to improve efficiency. For example, the water drop-shaped hammer mill can effectively solve the defects of the circulation layer, making the material pulverization more uniform and increasing the efficiency by 15%. The following is the FDSP high efficient water-drop type hammer mill:


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The width of the grinding chamber will also affect the efficiency. If the grinding chamber is too narrow, the screening area is small and the production capacity is low. The grinding chamber is too wide, the material layer becomes thin, the hammer hit area is large, and the effective hit is reduced. The appropriate width of the crushing chamber is generally small 40~100mm, medium 100~200mm, large 200~300mm.

3、Hammer factors

Hammer factors include: arrangement of hammer, linear velocity of hammer, thickness of hammer and number of hammer.Hammer arrangement forms include helical arrangement, symmetrical balance arrangement and staggered balance arrangement, among which the staggered balance arrangement is evenly distributed and has high crushing efficiency, so it is widely used.

The higher the linear velocity of the hammer, the greater the crushing capacity and the greater the discharging capacity, and the higher the efficiency. But too much can also cause vibration and noise, and consume too much energy.Therefore, the appropriate linear speed should be used. Cereals are generally 80~90m/s, and high fiber materials are generally 105~115 m/s.

Hammer thickness is different, the contact area and the impact force are also different. The practice shows that the crushing efficiency of thin hammer is higher than that of thick hammer, but at the same time the disadvantage is that the wear resistance of thin hammer is worse and the life of thin hammer is shorter. So the appropriate thickness of the hammer is generally: thickness for corn is recommended 2~3mm, bean cake 6~8mm, 5mm is the most common use.

The number of hammer pieces also has an effect on the crushing efficiency. Too few quantity will reduce the crushing efficiency due to less effective strike; Too many will increase energy consumption, but also cause no load.

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4、Gap between hammer and screen

When the hammer mill is running, the ring layer will be formed between the hammer and the screen. If the gap is too large, the contact area between the material and the hammer becomes smaller, the effective blow becomes less, and the crushing efficiency is low. The clearance is too small, the contact between the material and the hammer becomes larger, the number of effective strikes increases, the grinding effect increases, the powder crushing is too fine, and the energy consumption increases. Therefore, the appropriate hammer-screen gap needs to be determined by professional debugging. It is recommended that the gap between for grain 4~8mm, straw 10~14mm and generally 12mm.

5、Screen hole and screen factors

The pore size of the screen directly affects the granulation efficiency. Small pore size reduces productivity and energy consumption. Large aperture, large grinding granularity, high output, and low energy consumption. According to the characteristics of different materials, the pore size should be increased as far as possible under the premise of satisfying the particle size. Common grain 1.2~2mm, stem type 3~4mm screen hole.


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FDSP was founded in the year of 2003, which locates in Liyang city,Jiangsu Province ,China, covering the area of 35000㎡. As a national high-tech enterprise,FDSP company will always be the first rank, which is the supplier and advanced system solution for the Feed machinery, biomass machinery, fertilizer machinery and project, etc. The main business is design, research, manufacture, sale, installation and wholesale project service for feed machinery, biomass machinery, fertilizer machinery, silo machinery, pellet mill molds and intelligent control system. 

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