When users choose crushing machinery, they are often confused and do not know how to choose many crushing machinery. This article introduces the classification method of crushing machinery and common types of crushing machinery: one of the selection of crushing machinery
1. Classification and scope of application of crushing machinery
(1) The method of material crushing
Although there are many types of crushing machinery, according to the different methods of applying force, there are methods for crushing materials such as extrusion, bending, impact, shearing and grinding. In the crushing machine, the force application is very complicated, and several types of force are often present at the same time. Of course, there are one or two main forces in a crushing machine.
Because the shape of the material particles is irregular and the physical properties of the materials are different, the crushing methods used are also different. There are several methods for using mechanical force to crush the materials according to the external force applied.
Place the material between two working surfaces. After applying pressure, the material will be broken due to the compressive stress reaching its compressive strength. This method is generally suitable for crushing large pieces of material.
Put the material between a plane and a working plane with sharp edges. When the working plane with sharp edges squeezes the material, the material will split along the direction of the pressure action line. The reason for splitting is that the tensile stress on the splitting plane reaches or exceeds the tensile strength limit of the material. The tensile strength limit of the material is much smaller than the compressive strength limit.
The material is broken by bending stress. The simply-supported beam or multi-support beam with two fulcrums under the concentrated load of the crushed material is broken and broken when the bending stress of the material reaches the bending strength of the material.
4. Impact crushing
The material is broken by the impact force. Its crushing force acts instantaneously. Its crushing efficiency is high, the crushing ratio is large, and the energy consumption is small. Impact crushing has the following situations:
(1) The impact of the moving work body on the material;
(2) High-speed moving materials impact on a fixed working surface;
(3) Tell the moving materials to impact each other;
(4) The high-speed moving body impacts the suspended materials.
5. Grind (grind)
After a certain pressure and shear force are applied between the material and the moving working surface, when the shear stress reaches the shear strength limit of the material, the material will be smashed; or the shearing and grinding effect of the friction between the materials And crush the material.
(2) Classification of crushing machinery
1. Types of crushing machinery
According to the different structure and working principle, the commonly used crushing machinery has the following types.
(1) The jaw crusher (jaw crusher) relies on the periodic reciprocating movement of the movable jaw to crush the material entering between the two jaws.
(2) Hammer crusher (hammer crushing) The material is crushed by the impact of the high-speed rotating hammer and the material itself impacts the fixed liner at high speed.
(3) The cone crusher (cone crusher) relies on the eccentric rotation of the inner cone to crush and crush the material between the two cones.
(4) Impact crusher (reaction crusher) The material is hit by the high-speed moving hammer, causing the material to hit the impact board at high speed, and the materials collide with each other to be crushed.
(5) Roller crusher (roller crushing) The material falls between two parallel and oppositely rotating rollers (rotating toward each other). The material is pulled into between the rollers under the action of the friction on the surface of the rollers and is subjected to the rollers. Squeezed and broken.
Another point worth noting is that the crushing ratio and unit power consumption (energy consumption per unit mass of crushed products) are the basic technical and economic indicators of crushing machinery. The unit power consumption is used to distinguish whether the power consumption of the crushing machine is economical, and the crushing ratio is used to describe the characteristics of the crushing process and identify the crushing quality. Even if the unit power consumption of two crushers is the same, but the crushing ratios are different, the two crushing machines The economic effect is still different. Generally speaking, machinery with a large crushing ratio has a higher working efficiency. Therefore, to identify the working efficiency of the crushing machine, the unit power consumption and the size of the crushing ratio should be considered at the same time.