Highest quality, efficiency and flexibility

Tietjen Hammer mills & Grinders

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hammer mill

Whether coarse or fine grinding, small or high throughputs, a wide range of requirements is covered by our hammer mills. Typical applications are compound feed, pet and aqua food, wood, ethanol and food.
Our grinders are characterized by their robust design and well-engineered technology. The machines are often used by our customers for several decades. Tietjen’s focus is on an efficient and economical grinding process. All our grinder types are designed to be maintenance-friendly and thus have a high availability.

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Individual solutions for our customers

THE SPECIAL FEATURES

Durable, reliable and efficient machines

Our industrial hammer mills or grinders are “made in Germany”. We use only high-quality components, such as our 6-axis rotor design. Based on our many years of experience, we have optimized our mills: They are characterized by ease of maintenance, durability, and efficiency.

The largest selection of hammer mills.

With 54 different types of horizontal hammer mills, crushers and grinders, over 2200 mills installed worldwide and more than 60 years of experience, we can offer our customers exactly the right hammer mill for their application.

More than just the hammer mill!

As an optimal grinding system does not only consist of the hammer mill, but also of feeding, dosing, aspiration and filter etc., Tietjen offers its customers individual, optimized grinding systems. Read more about our grinding module and plant engineering.

Designed for Efficiency

Our large chamber mills at a glance

The large chamber hammer mills are designed for high grinding performance. The special design allows the rotors to start up very quickly despite their size, and the support frame allows the beaters to be changed quickly and easily in just a few minutes. Both reduce downtime and increase throughput.

In Tietjen hammer mills, the grinding chamber is symmetrically designed. This allows the rotor to be operated in both directions of rotation, which not only increases the life of the beaters and screens, but also keeps the structure of the ground material constant over a longer period of time.

Depending on the design, screen changes can be performed manually, semi-automatically or fully automatically during operation (when the grinding chamber is empty). This also increases the throughput of the machines and the individual performance of our mills.

Our all rounders

High speed hammer mills

High speed mills are universal hammer mills. These grinders are considered to be a high-quality standard option for feed production, ethanol production and fibre processing. Our high speed mills are used for grinding dry materials as well as for wet crushing. Our robust designs have proven themselves over decades, are technologically mature and particularly easy to use. The service life of the machines often exceeds 30 years.

Perfectly prepared

Wet hammer mills for biomass

In wet grinding, crushing or shredding, the particle size of the wet or moist material is reduced and  mixed with liquids. Following the product is pumpable.

Due to the wet process, corrosion and acid reactions must be excluded in the process. Therefore, all parts of Tietjen machines for wet shredding that are in contact with the product are made of stainless steel. This is how we guarantee reliability and durability in wet shredding.

Our machines for wet biomass process are used for biogas substrate preparation as well as in food processing.

Expertise in grinding for 60 years

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ABOUT TIETJEN’S Grinders

grist spectrum hammer mill

As a manufacturer Tietjen has machines in operation worldwide in various applications. The field of application is very wide. And the number of mainly natural raw materials and biomass that are ground increases continuously. Tietjen’s main focus in the grinding of raw materials is on:

  • dry and free-flowing bulk materials, such as cereals
  • high-fat and high-protein products, such as recipes for the animal feed industry or certain foodstuffs
  • foodstuffs such as dried beans, pulses but also dried fruits
  • fibers, such as wood and straw
  • products for the industrial ethanol production

The machines grind a wide variety of input materials until the material reaches the desired particle size. Another important quality criterion besides the particle size is the uniformity or distribution of the particle size (both factors together determine the so-called grist spectrum).

Setup

HOW EXACTLY ARE OUR HAMMER MILLS DESIGNED?

drawing-hammer-mill

The exterior view of a design by Tietjen shows that the main components are the grinding chamber, a coupling and an electric motor mounted on a supported base. In addition, there is the control unit of the system.

Inside the cylindrical grinding chamber there is a rotor, which is connected to the electric motor via the coupling. At the top of the grinding chamber there is the inlet for the material to be ground. The inlet flap can be adjusted depending on the direction of rotation. To the right and left of the inlet are the impact zones and the remaining area is equipped with screens. Tietjen hammer mills have a particularly large sieve area for a high passage or throughput of the mill. At the bottom of the grinding chamber there is a collecting container for impurities, such as stones or metal parts. With the help of our AGS AD feeding system these impurities can be automatically separated and discharged.

Working principle

HOW DOES A HAMMER MILL WORK?

Hammer Mill Rotation Hammer mill with feeding system

At the beginning of the process, the material to be ground is fed into the grinding chamber with a feeding or dosing device. The feeding process needs to be as uniform as possible – in terms of quantity per unit of time and per distribution over the width of the grinding chamber. The feeding device is as well used to ensure good ventilation of the hammer mill. This aspiration is necessary for transporting the material to be ground through the hammer mill, keeping the screens free, and cooling the grinding chamber. The aspiration is to be optimally controlled based on the specifications for vacuum and volume flow.

That is why the mill is called Hammer Mill!

In the grinding chamber of the hammer mill, the rotor rotates at high speed. A defined number of removable beaters are attached to the outer circumference of the rotor. These beaters are also called hammers. They are precisely balanced to avoid vibrations. In Tietjen hammer mills, these beaters can be replaced very quickly and easily.
During the process the rotating beaters grip the material to be ground as it enters the beating circle of the rotor. The impact of the beaters achieves the greatest particle size reduction effect. The beaters throw the pieces/particles at the impact plates and screens, where they are further broken by the impact. The ground material remains in the grinding chamber until it is so crushed that it can pass the screens in the grinding chamber.

Optimal grist spectrum

HOW IS THE GRAIN SIZE INFLUENCED

The screen has the function of limiting the size. The oversize can be changed by replacing the screen. In addition to the screens, the aspiration, the beaters, and the speed have an influence on the particle size. Each of these factors can be individually adjusted to the customer’s recipe with Tietjen’s hammer mills. In general, it can simplified be saying:

  • the smaller the screen perforation
  • the higher the speed
  • the higher the number of beaters

the finer the end product. However, a lot of experience is required to obtain the most uniform particle size (“narrow particle band”) possible, which is matched to the customers’ recipes or the targeted pellet size and quality.

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