How to choose the right type of hammer mill grinder?

When you want to buy a hammer mill grinder to process wood and crops, you can ask yourself the following questions for reference.

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What raw materials do you want to crush?

• To crush grain feed, you can choose hammer mill with the feed hopper on the top.
• To crush wheat and bran cereals, you&#;d better choose disc mills.
• To process mineral feed like shells, you can choose non-sieve grinders.
• The pretreatment of mixed feed requires small and adjustable particle sizes, you should choose special type of non-sieve grinder.
• If you want to crush different kinds of materials, such as grains and crop straws, you can choose tangential feeding hammer mill grinder. 

What's you required production capacity?

Generally, on the instruction and nameplate of the hammer mill grinder labels the capacity rating. But you should be clear that the rated capacity is under standard condition. For example, the standard of grain hammer mill is when the moisture content is around 13%, the screen mesh diameter is 1.2mm. This is the smallest screen mesh with low production. You should consider these factors when buying.

The production capacity of the hammer mill you choose should be a higher than your demand. Once the production drops due to hammer wear or air duct leakage, the production capacity would decrease.

What&#;s the power of the hammer mill grinder?

On the instruction and nameplate of the hammer mill grinder usually labels the rated power of the electric motor. It is not a fixed number but a certain range. The required power varies with different raw materials. For example, under the same working condition, the required power for crushing sorghum is 1 time more than that of corn. Besides, with different size of screen mesh, the load of the hammer mill are varied.

How much electric power does your hammer mill consume?

In some areas, the government stipulated the least energy efficiency ratio for production. For example, when grinding corns with 1.2mm screen mesh, the output per KWH shall not be less than 48 kg. Nowadays, most hammer mills have their energy efficiency over the required level. Some superior hammer mills have achieved 70-75kg per KWH.

How are your raw materials discharged?

The crushed materials are discharged in 3 ways: self-weight, negative pressure suction, and mechanical transport. Small hammer mills usually adopt self-weight discharge method. Middle-scale type are usually equipped with negative pressure suction device, which can absorb moisture from the materials. To lower the moisture content of raw materials will increase the grinding efficiency by 10-15%, lower the dust degree in the crush chamber, and facilitate storage.

How mush dust and noise the hammer mill generates?

In a feed pellet plant, most dust and noise come from the hammer mill. You must take these sanitation factors into consideration. If you have chosen hammer mills with high noise and dust generation, you have to take noise and dust prevention method to improve the working environment.

What affects the production efficiency of hammer mills?

To choose the right type of hammer mill grinder, the most important parameter is the production efficiency. Different hammer mills varies a lot in production efficiency, which is affected by the following factors:

Raw material moisture content

Crop straws with high moisture content has high tenacity and hard to crush. The moisture content would increase the viscosity of the raw materials and reduce their fluidity, so as to lower the output speed and the production efficiency.

The diameter of the crushing chamber

Reasonable crushing chamber size can increase the working efficiency of hammer mill. The diameter of crushing chamber should adapt to the raw materials and the sieve mesh size.

Spindle speed

Within certain range, the higher the spindle speed, the higher the production efficiency. But once the spindle speed surpass the limit value, the production efficiency would drop. In the empty return stroke, if the spindle rotates too fast, the hammers will swing at high frequency. The raw materials have very short time to pass, so the crushed materials cannot be expelled successfully, and block the crushing chamber. By contrast, low spindle speed would cause the slow swing of hammers, so the raw materials can&#;t be fully crushed.

Routine maintenance

Good operating condition is the premise of high production efficiency. As a crushing equipment, the high working intensity will accelerate the abrasion of core parts. Therefore, the user should inspect and maintain the hammer mill regularly, so as to ensure the production efficiency and prolong the working life.

Standardized operation

The operator of the hammer mill need professional training, and have a comprehensive understanding of the equipment. Operating the hammer mill in accordance with regulations can ensure the safety of labors and the equipment.

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Types of Hammer Mills

There are many reasons to utilize size reduction equipment like a hammer mill. You can use this equipment on a wide variety of materials, such as concrete, coal, wood, shale, limestone, brick and plastic. Depending on the needs of your industry, you can select a hammer mill that presses bulk materials into the preferred state, from coarse to very fine.

If you are seeking size reduction equipment, you should understand what a hammer mill is, how it works, what the different types of hammer mills are, how a variety of industries use hammer mill pulverizers and the benefits of using a hammer mill.

What Is a Hammer Mill?

A hammer mill, also known as a pulverizer, is designed to mill, grind and crush material. These mills have been in use for much of human history and function by using hammer blows at high speed to grind material. The material is shattered and disintegrated by the internal hammer. The hammer mill is used for processing materials in a wide range of industries, including:

• Food

• Mining

• Cosmetics

• Recycling

• Chemicals

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  Additional reading:
  History of horizontal directional drilling

• Agriculture

• Construction

• Manufacturing

• Pharmaceutical

• Power generation

A Hammer mill is a crusher that can be considered as a primary, secondary or tertiary type hammer mill. This availability allows for a wide range of uses. The final size of the product depends on a few factors of the hammer mill's design, such as:

• The rotor speed

• The hammer configuration

• The grinding plate's setting

• The material being crushed

• The size and number of hammers

• The size of the feeding mechanism

• The size of the perforated screens' openings

How Does a Hammer Mill Work?

A hammer mill contains a cylindrical steel drum. Inside this drum, hammers are mounted on a vertical or horizontal shaft. The hammers inside this drum rotate around their axis. The material is fed into the drum, and when the drum rotates, the hammers strike the material.

After the material is ground and shredded, it passes through the chosen screens inside the drum. Hammer mills that do not contain screens instead use air to separate small and large particles from the ground material. Depending on the application, the power capacity and size of a hammer mill vary.

What Are the Types of Hammer Mills?

There are a few kinds of hammer mills. The following are some of the hammer mill styles you can choose from:

1. Lump Breakers

By functionality and design, a lump breaker hammer mill is quite different from other types of hammer mills. The parts of a hammer mill differ, as lump breakers do not have any swinging hammers. Instead, they have a fixed hammer structure, referred to as a comb. Rather than reducing particle size, this mill is used to smoothen paste or powder. To get the desired particle size, the particles are passed through the comb. You can use this hammer mill for dry chemicals, sugar and cement.

2. Full Circle Screen

A full circle hammer mill features a rotating screen to improve particle evacuation. This hammer mill can be used to reduce the size of lightweight components that do not require any initial grinding, such as grasses, grain, sawdust, corn and spices. Sticky materials cannot be hammered by this mill because the material could stick to the screen.

Contact us to discuss your requirements of sand making machine. Our experienced sales team can help you identify the options that best suit your needs.