Natural sand resources are scarce and mining costs are high.（stone crusher） In addition, policies banning the mining of river sand have been introduced, which has promoted the development of manufactured sand. As an important equipment for producing machine-made sand, sand making machines have a wide variety of types and a wide range of applications. Different sand making machines have different working principles, which will directly affect the output and investment benefits of the machine-made sand production line.

Take the vertical shaft impact crusher as an example. It adopts two crushing methods: "stone on stone" and "stone on iron". The crushing method can be switched at will. It has high crushing efficiency and good sand making effect. It can produce high-quality machine-made sand that meets the sand standards. , to replace natural sand, then how to choose two crushing modes during the production line?


There are differences between these two crushing methods, which can generally be distinguished from the following points:


1. Different working principles

The working principles of the two crushing methods of "rock on stone" and "stone on iron" should be combined with the feeding method. According to the different feeding materials, they are divided into "complete center feeding" and "center feeding with waterfall feeding" . When feeding in the complete center, the bulk material cone is removed (or the bulk material tray is fully opened), and all materials fall directly into the material distribution tray from the feed port, and directly enter the throwing wheel through the middle of the material distribution tray.


1


"Stone against stone" complete center feeding principle


The material enters the rotor of the crusher through the feed hopper. The high-speed rotating rotor throws the material out. The thrown material rebounds to the impact guard. When it falls, it collides with the material thrown out of the rotor and is impacted multiple times in the crushing cavity. It is broken by friction and friction. The broken materials leave the crushing chamber under the action of gravity and enter the discharge hopper of the lower shell for discharge.


"Stone hits iron" complete center feeding principle


The material enters the rotor of the crusher through the feed hopper. The high-speed rotating rotor throws the material out. The thrown material is crushed by hitting the outer protective plate. The crushed material leaves the crushing chamber under the action of gravity and enters the lower shell. The unloading hopper is used for unloading.


2


"Stone hits stone" waterfall center feeding principle


The material enters the sand making machine through the central feeding pipe, falls onto the distribution tray through the bulk material cone, and is divided into two parts by the distribution tray. One part enters the throwing wheel from the dividing tray and is ejected from the flow channel of the throwing wheel at high speed. The other part of the material in the distribution plate is impacted and broken, and finally hits the material lining of the crushing cavity, and then rebounds to the top of the crushing cavity to form a continuous material curtain. The material is finally broken after multiple impacts and frictions.


"Stone strikes iron" waterfall center feeding principle


Its basic working principle is basically similar to the "stone on stone" waterfall center feed. The difference is that in the "stone on stone" crushing chamber is equipped with a strike guard, and the material forms a lining around it, and the material is pressed onto the lining. Impact crushing, while in "Stone Strikes Iron", the lower impact guard is replaced with a peripheral guard, and the material is impacted and crushed directly on the peripheral guard.


2. Different scope of application


The choice of crushing method for impact crushing also depends on the material properties and the purpose of making sand. "Stone on stone" is suitable for medium-hard and above abrasive materials, such as basalt, quartz, granite, etc. The materials collide with each other and are broken. Generally, It is not in direct contact with the metal components of the equipment, which can reduce iron consumption and save maintenance costs. In addition, the finished grain shape is better under "rock on stone" working conditions, but the powder content is slightly higher.


Feed 2


"Stone-for-iron" is suitable for medium-hard and less abrasive materials, such as limestone, dolomite, etc. Under the "stone-for-iron" working condition, the crushing efficiency is higher, the wear cost of the surrounding protective plate is higher, and the finished grain shape is slightly worse.


In short, the difference between the two crushing methods of stone-on-rock and stone-on-iron is mainly in terms of crushing efficiency and particle size. In terms of crushing efficiency, the crushing efficiency of stone-on-iron is higher than that on stone-on-rock. However, considering the particle shape, the particle shape of stone-on-stone is better than that on stone-on-iron. Therefore, "stone on stone" is suitable for shaping, and "stone on iron" is suitable for sand making.


3. The main wear-resistant parts are different


In the "rock on stone" crushing method, the material mainly forms a material layer around the impact guard, and then the material impacts the material layer for crushing. Therefore, the main wear-resistant part of this method is the impact guard.


In the "rock-on-iron" crushing method, the material directly impacts the peripheral guard plate and is broken. Therefore, the main wear-resistant parts in this method are the peripheral guard plate and the anvil.

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750 vertical axis

The above are several methods to distinguish between "stone against stone" and "stone against iron". When actually purchasing equipment, you must choose the appropriate crushing method according to the materials you are crushing, production capacity, discharge requirements, etc., in order to ensure production efficiency. , producing high-quality machine-made sand.


If you want to find a big brand manufacturer with guaranteed quality and after-sales service, you might as well come to Henan Xingao Nai Heavy Industry. As a leader in the mining crushing machinery industry, Xingao Nai VSI impact sand making machine has been continuously updated over the years. The technology is more perfect and we have always insisted on precision manufacturing. From business reception to solution support, from installation and debugging to after-sales training, large manufacturers have a standardized value-based service system throughout, and a series of differentiated technical support covers all aspects.