Both in construction and in many other industries, special crushers are used to grind various materials and obtain the necessary fractions. They come in different models that are designed for a certain type of work. Depending on the type of crushing mechanism of the device, there are conical, rod, hammer, jaw, roll and rotor devices.
What is a rotary crusher?
A rotary crusher is an impact aggregate designed for crushing non-abrasive and medium-strength rock materials. The industry produces models for large, medium and small grinding, structurally differing in the size of the rotors and the number of reflective plates. All of them provide high quality crushing.
The most popular type is the rotary crusher SMD (stationary crushing machine), which consists of a frame, a rotor, a housing, reflective plates, beats and a mechanism for regulating the gap between the plate and the beats. Its peculiarity is a special recirculation device, which allows you to ultimately get material fractions of the required shapes and sizes.
It differs from other types in that the devices with which the crushing occurs are rigidly fixed to the rotor. It is used for primary and secondary crushing of iron ore, basalt, dolomite, coal, marble and other materials. The rotary crusher has high economic and technological characteristics, which makes them popular.
There are also mobile (on wheels) rotary crushers, which are designed to work in difficult conditions. When using them, there is no need to transport material, since they work directly in the processing zone. The mobile rotary crusher has high productivity and has excellent performance when crushing heavy rocks. It is used in the chemical and metallurgical industries, in various industries in the manufacture of building materials.
Classification
Rotary crushers are classified depending on the unit design on:
- irreversible single-rotor crushers with or without grate;
- reversible single-rotor;
- two-rotor with or without grille.
Principle of operation
Easy to use rotary crusher, the principle of which is simple, performs crushing as follows. The blades mounted on the rotor rotate in a circle at high speed, destroying the material in the crushing chamber. It hits the walls and breaks up into smaller pieces. The level of grinding can be controlled by the speed of the rotor or the necessary gap established between the reflective plate and the beater.
Primary crushing of the material is subject to certain conditions. The moisture content of the rock should not be higher than 9-10%, and the content of quartz sand in it - 10%. The rotary crusher can be used at various stages of crushing, even until the material is completely crushed.
Advantages and disadvantages
The rotary crusher has convenient, small external parameters. It has high performance and stability. Maintenance of these machines is not difficult, as their design is simple and reliable. For a long service life and operational efficiency of the crusher, all work units and spare parts are made of high quality materials.
Due to the operational characteristics, the units can be used simultaneously for several stages of work. This allows you to increase productivity and significantly save time. The process of crushing the material occurs evenly, which ensures the receipt of the same size fraction of each crushed piece.
In addition to the advantages, this type of crusher also has disadvantages. One of the main disadvantages is the inability to crush abrasive and hard materials. When grinding such rocks, beats and slabs quickly become unusable, and the process of replacing them is complicated and expensive.
Fields of application
A rotary crusher is used in the mining, electrical, metallurgical, chemical industries, construction. Particularly popular is the crushing machine of this type in road construction for the production of crushed stone, the disposal of construction waste at sites. Rotary crushers are in demand due to their simple construction, high productivity, ease of operation and energy efficiency.