Zhengzhou Dingsheng Technology Co., Ltd. Crushers Machine

DSMAC Group is a crusher machines and sand making machine manufacturer with a complete line of crushing, grinding and screening equipment,offer jaw crusher,impact crusher,concrete crushers,rock crushers,cement crusher plant.

How does hammer mill work?

With the development of mining industry, crusher machines play a more and more important role, we all know jaw crusher, cone crusher, impact crusher and hammer crusher, then, hammer mill is one main equipment in rock and various mineral resource crushing, hammer mill is widely used for medium or fine crushing for medium hard and brittle materials by departments of mine, cement, coal, building material, metallurgy, chemical industry, road construction, gas chemical industry and thermal power generation, etc. Then how does hammer mill crush the raw materials?

hammer mill working principle

hammer mill working principle

In the hammer mill machine, the motor drives the rotor rotate at a high speed through the belt, and on the rotor there are series hammers. When the materials get into the working area of hammers, the rotating hammers with high rotation speed are crushing them, the products which are crushed to meet the required size can be discharged by the outlet and become the final products, the large size products are brought back to the crushing area by the hammers for being re-crushed until they reached the required size.

The hammer mill is suitable in mining industry, it can be used to crush coal gangue, coke, slag, limestone, phosphate rock, salt, whiting, gypsum stains, alum, brick and tile, etc. The compression strength of the materials shall not exceed 100MPa, while the moisture content shall be lower than 15%. What’s more, the wear parts of the hammer mill are easily replaced due to the hydraulic opening device, hammer mill is easy to service and maintain.

Besides hammer mill, DSMAC also offers other crusher machines, and crusher parts, crushing plants, and so on. DSMAC is a professional crusher machines manufacturer in China, it has exported to India, United States, Malaysia, Iraq, Saudi Arabia, Pakistan, Indonesia, South Africa, Nigeria, Mexico and Guatemala, France, Germany, Canada and so on.

Advantages and disadvantages about hammer mills

Advantages and disadvantages about hammer mills

The hammer mill  has been applied to cement clinker grinding and ultra-fine grinding in the circuit operating for a long time. Besides the roller press, it is the best type for producing the final products in good shape and granularity on the market.

In the feed processing process there may be a number of ingredients that require some form of processing. These feed ingredients include coarse cereal grains, corn which require particle size reduction which will improve the performance of the ingredient and increase the nutritive value. There are a many ways to achieve this particle size reduction, here we are looking at using hammer-mills, for information on roller mills, see the related links at the bottom of this page.

Both hammering and rolling can achieve the desired result of achieving adequately ground ingredients, but other factors also need to be looked at before choosing the suitable method to grind. Excessive size reduction can lead to wasted electrical energy, unnecessary wear on mechanical equipment and possible digestive problems in livestock and poultry. For more in depth information regarding what actually occurs to the ingredients during size reduction please refer to this link: particle size reduction.

Hammer mills Advantages:

1. are able to produce a wide range of particle sizes
2. work with any friable material and fibre
3. ease of use
4. lower initial investment when compared with a roller mill
5. minimal maintenance needed
6. particles produced using a hammermill will generally be spherical, with a surface that appears polished.

Hammer mills Disadvantages:
1. less energy efficient when compared to a roller mill
2.  may generate heat (source of energy loss)
3. produce greater particle size variability (less uniform)
4.  hammer mills are noisy and can generate dust pollution

Hammer Mill Working Principle:

Hammer mills work on the principle that most materials will crush, shatter, or pulverize upon impact using a simple four step operation:
1.Material is fed into the mill’s chamber typically by gravity.
2.The material is struck by ganged hammers (generally rectangular pieces of hardened steel) which are attached to a shaft which rotates at a high speed inside the chamber. The material is crushed or shattered by the repeated hammer impacts, collisions with the walls of the grinding chamber as well as particle on particle impacts.
3.Perforated metal screens, or bar grates covering the discharge opening of the mill retain coarse materials for further grinding while allowing properly sized materials to pass as finished product.
4.Hard, heavy materials such as glass, stone or metals exit the mill via gravity.

Hammer mills process material with a pulverizing action. Rectangular steel hammers are attached to a shaft inside of a steel grinding chamber. As the shaft spins, the hammers flail out, bringing them into contact with the material being processed. A combination of hammer blows, particle on particle impact, and contact with the mill interior, work in unison to reduce the material until it is able to pass through the screen or heavy bar grate covering the mill’s discharge opening.