Types of Hammer Mills Explained - Pulva

Author: Hou

May. 06, 2024

Types of Hammer Mills Explained - Pulva

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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
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.

Impact Crusher Vs. Hammer Crusher: 8 Key Differences

The impact crusher and hammer crusher both use the impact principle to crush materials, and the product has an excellent grain shape. They look similar, but are different in many ways. So, which is better?

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This blog will compare them in materials, price, structure, output, grain shape, wear parts, etc.

1. Different in materials

The impact crusher is designed for the crushing of hard and high-moisture materials. It is very suitable for highway, water conservancy, railway, airport, and other industries.

The hammer crusher is used for the large-scale and high-yield production lines. It is simple and efficient by crushing and forming at one time.

Types Impact crusher Hammer crusher Material hardness Medium-hard materials with low toughness and high brittleness Medium-hard and brittle materials Material with high moisture content Applicable

Unapplicable

(Water content should not exceed 10%)

Compressive strength of materials ≤ 350 MPa ≤ 200 MPa Feed size ≤ 800 mm ≤ 1800 mm Common materials Granite, concrete asphalt, construction waste, gypsum, dolomite, clay, river pebble, etc. Glass recycling, limestone, quartz, slag, coal, etc.

Not sure whether your materials can be processed or not? Free Sample Testing!Contact us.

2. Different in price

Impact crusher price: $1, 000 (the lowest price).

It is mostly used as the secondary crushing equipment, so a coarse crusher is also needed in the crushing. It crushes small materials that discharge from the jaw crusher.

Hammer crusher price: It has many models with the lowest price of $976. Among them, the heavy hammer crusher has a larger granularity and is sold $5, 000-$180, 000.

Hammer crusher can form a single production line to achieve one-time molding, which can simplify the crushing process and save 40% of the cost.

3. Different in structure

Structure design Impact crusher Hammer crusher Crushing cavity

2 or 3 large crushing cavities.

Advantage: the crushing is more sufficient.

1 small crushing cavity.

Advantage: good sealing, solve dust leakage.

Direction of plate hammer/hammer head The plate hammer moves from the bottom to the top to crush, then it throws material onto the upper impact plate. The hammer head strikes and crushes along the direction in which the material falls. Rotor link

The plate hammer is fixed on the rotor.

Feature: large speed and kinetic energy.

The hammer head hangs in the air and crushes materials individually.

Feature: limited speed and kinetic energy.

Output size adjustment

Adjust the rotor speed;

Adjust the rotor diameter;

Adjust the opening size of the distributor;

Adjust the gap of the grinding chamber.

Adjust the screen gap of the sieve plate.

4. Material blockage

Impact crusher: It is not easy to cause material blockage.

Reasons:

It can be equipped with a heating device to prevent blockage due to adhesion.
There is no grate at the bottom. The product size is determined by the gap between the impact plate and plate hammer. Therefore, it can process high-moisture materials.

Hammer crusher: It is equipped with a bottom sieve plate, which increases the possibility of material blockage.

5. Different in output

Impact crusher: Although the grain shape is more rounded after 2-3 shaping processes, multiple impacts seriously affect the output (productivity).

: Although the grain shape is more rounded after 2-3 shaping processes, multiple impacts seriously affect the output (productivity).

Hammer crusher: It has a higher output, up to 3 times that of an impact crusher. Therefore, it is often used in large-scale and high-yield production lines.

6. Different in grain shape

Impact crusher: The crushing ratio is above 50. The discharge is cubic, with uniform particle size, without tension and cracks. And the fine powder and dust content are low.

So, the impact crusher is the final crusher to produce concrete aggregate for the antiskid pavement of the high-grade highway.

Hammer crusher: The crushing ratio is large (generally 10-25, even to 50). The output size is 25 mm or less. The product contains more needles, flakes, and powders.

7. Different in wear of wear parts

Whether for the impact crusher or hammer crusher, the plate hammer and hammer head are the main wear parts.

Impact crusher: It wears little during the crushing, as the wear occurs only appears on the side of the material, and its metal utilization rate can reach 45%-48%.

When crushing limestone, the plate hammer is not seriously worn. However, when crushing granite with high hardness, it needs to be replaced constantly.

Hammer crusher: Due to the hanging state of hammer head, the wear occurs at the top, front, back, and side. Compared with the plate hammer, the hammer head is more seriously worn, and its metal utilization rate is 35%.

Besides, the rotor of hammer mill may also be worn. The bottom screen plate can be severely worn so you need to replace all the grids, which is very complicated.

8. Equipment maintenance

How to maintain the impact crusher?

Only 6 plate hammers are installed on the rotor. The plate hammer is easy to replace, and it only takes one shift to replace one set.
Replacing the grinding rod only takes a few minutes, which can save you more time and cost.
Due to the large hammer head and strong vibration force during operation, its balance needs to be calibrated during installation in case of any danger.

How to maintain the hammer crusher?

There are more than 100 hammer heads. Replacing a set of hammer heads requires a lot of time and labor. And the maintenance cost is high.
Replacing the bottom sieve plate of hammer mill is also extremely troublesome.

You may like to read:

9 Faults and Solutions of Hammer Crusher

Conclusion

How to choose between the impact crusher and hammer crusher? You should choose according to the actual production situation.

Types Impact crusher Hammer crusher Hard materials √ High requirement for final grain shape √ High demand for output √

Ftmmachinery has been engaged in the production of crushing equipment for nearly 40 years. Contact us to customize your best crushing plant !Contact us

Author : Jordan

Jordan is the writer of the blog with a broad knowledge of this industry. Most importantly, he hopes to help you in your projects sincerely.

If you want to learn more, please visit our website hammer mill crusher.

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