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The Role of Crushers in Construction

Excavators, bulldozers, and cranes are examples of large construction equipment that is popularly known in the construction industry. However, there is another type of equipment that can be useful in various construction projects. This is referred to as crushers. Crushers are the largest piece of heavy machinery that people fail to get familiar with. They are unaware of how handy and adaptable crushers are compared to other pieces of technology and equipment.

A crusher is a piece of equipment that is utilized to reduce the size of huge rocks or gravel for use in building. They can also be used to change the shape of waste material for recycling or easy disposal. Additionally, crushers are used to reduce the size of the raw material mix for distinction and segregation. By using other materials with a stronger connection, crushing includes transmitting a force that is greatly increased. The necessary materials are easily crushed since the extra components are robust and resist deformation. The material to be crushed is held between two solid surfaces by the crushing mechanism. The surfaces are brought together by a force that is applied to them. The molecules are separated by energy that is generated inside the materials that will be istanbul escort bayan crushed.

Additionally, a crusher is a multi-dimensional device created to transform huge materials into smaller ones. It can be used to shrink or alter the shape of waste products so they can be recycled or disposed of more readily. It can also be used to shrink a solid mixture of raw materials so that fragments with different compositions can be distinguished for separation.

Crushers definitely play a huge role in the industry. To know more about this construction machinery, continue reading.

Crushing Methods

There are actually four fundamental techniques for material reduction — impact, attrition, shear, and compression. All of these crushing techniques are combined in the majority of crushers.


Impact is the crushing term for the sudden, sharp collision of two moving objects in crushing. One thing may be immobile while the other is moving. Impact comes in two flavors — dynamic impact and gravity impact.

Gravity impact in the result of a substance being dropped onto a hard surface, like a steel plate. When it’s necessary to separate two materials with substantially varying friabilities, gravity impact is most frequently used. While the less friable material is left intact, the more friable stuff breaks. Screening can then be used for separation.

On the other hand, dynamic impact is demonstrated by a substance falling in front of a moving hammer. The stationary object briefly stops the falling material when it is struck by gravity and crushed. However, when material is crushed by dynamic impact, it is not supported, and the force of the impact causes the reduced particles to flow more quickly in the direction of breaker blocks and/or additional hammers. There are unquestionable benefits to dynamic impact for the reduction of various materials.


Attrition refers to the process of reducing materials by rubbing them against two hard surfaces. Hammer mills work with small clearances between the hammers and the screen bars, and they reduce materials using a combination of impact, shear, and attrition. Attrition is a useful technique for crushing less abrasive minerals like limestone and coal, while using more power and causing hammers and screen bars to wear out more quickly.


Instead of the rubbing action associated with attrition, shear involves a trimming or cleaving movement. Shear is generally paired with other procedures. For instance, single roll crushers combine compression, impact, and shear. Shear crushing is typically required when a relatively coarse result is sought or when the material is slightly friable. It typically uses a 6 to 1 reduction ratio for first crushing.


Crushing by compression, as the name implies, is done between two surfaces, with one or both surfaces performing the labor. Using this compression technique, jaw crushers can reduce very hard and abrasive materials. Some jaw crushers, nevertheless, also use attrition in addition to compression, making them less ideal for abrasive materials because the rubbing motion amplifies surface wear.

If the material is robust and hard, abrasive, non-sticky, and the completed product needs to be somewhat coarse, compression should be employed as a mechanical reduction method.

Types of Crushers

There are actually two main kinds of crushers — primary and secondary. The size of materials that these two main types can effectively break down is used to classify them.

Primary Crushers

Primary crushers are those types of equipment that are heavy duty, which have the ability to crush ROM ore. Jaw crushers and gyratory crushers are under the category of primary crushers.

Jaw Crushers

This type of crusher uses compression force, in the process of reducing the size of the materials. Its processing rates range from 100 to 350 revs per minute. Cast steel replaceable liners made of iron or manganese steel are used to make the parts of this crusher.

The reception areas of jaw crushers, such as the width of the plates and the distance between the jaws and aperture, are used to classify them. Additionally, among all crusher types, Jaw Crushers have the easiest setup because they are the earliest modern prototype. A large V with metal walls can be used to describe the physical look of a jaw crusher. Pulleys that are powered by a motor drag the walls. The movable jaw crushes stones as it approaches the fixed jaw. The pounded stones are expelled from the hole as the angle between the two jaws narrows as they are further crushed.

Gyratory Crushers

The steel conical grinding apparatus on a gyratory crusher features a lengthy spindle. It typically rotates in a conical direction at 85 to 150 rev/min. Heavy steel casting or plates are used to make the device’s outer case. After that, these metals are strengthened using reinforced white cast iron alloy.

Cone crushers and gyratory crushers actually use the same technique to break down rocks; the only difference is in the design. The stone materials are placed inside a container that has a base-mounted spinning grinder.

Secondary Crushers

Secondary crushers, on the other hand, can only manage to break down medium size rocks; not as much as primary crushers can do. There are actually five types of secondary crushers:

Cone Crushers

A cone crusher functions similarly to a gyratory crusher. But the only difference between the two is that a cone crusher has a less steep crushing chamber and more parallel crushing zones, and its spindle is supported rather than hung like that in a gyratory crusher.

Roll Crushers

The distinctive feature of a roll crusher is the way stone material is broken down through compression. And a roll crusher produces an equal size distribution as compared to other crushers. Additionally, a roll crusher works by sandwiching a material between two revolving rollers and using friction to carve out the desired shape.

Impact Crushers

As the name implies, impact crushers work in a different way than other types of crushers, as they apply pressure upon using them. The operation of an impact crusher differs greatly from a jaw crusher. The rotor has a blow bar inserted inside, and a motor rotates it quickly. A huge stone will be thrown to the impact devices mounted inside the rotor as it strikes the blow bar. The rock materials will repeatedly bounce back and forth from the blow bar to the impact devices. The rock components are crushed into tiny pieces during this process. And by altering the distance between the impact devices and the rotor, the products’ size and shape may be controlled.

Hammer Mills

A hammer mill, as the name suggests, uses a revolving hammer to smash delicate stones. Previously, manganese steel was utilized to make the hammers. Later, the hammer’s material was modified to nodular cast iron, which contains chromium carbide and makes it resistant to abrasion.

A hammer mill initially crushes the rocks into a solid plate or “beaker plate,” which further splits the particles. Finally, a discharge grate constructed of hammers crushes the particles. Materials that have not yet been reduced to smaller particles will then go through the hammering process once more.

Key Takeaway

Crushers are one piece of equipment that can be used in many different industries, including quarrying, recycling, mining, demolition, and even food processing. When further reduction is required for the stone materials that were blown up, it is employed in quarrying and mining. And even though it is little recognized, this machine is a need for any business that has to crush materials into a finer state. This adaptable device is certainly useful, particularly to those who enjoy creating or tinkering as well.

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