The reason why the car bottom, because the gangue contains a certain amount of water, water and coal, rock powder, rock mass through the transportation process vibration, extrusion, compaction and bonding, so that the car bottom. For this kind of non-consolidated substrate with certain bonding force, the cleaning mechanism of high pressure water jet is mainly scouring and separating to make it fall off, that is, using the function of high pressure water jet to wash. Because the high pressure cleaning machine has the characteristics of simple operation, high efficiency, and environmental protection, it has a good effect in the application of mining car cleaning. The following mainly introduces the nozzle structure selection of the high pressure cleaning machine in the cleaning car application.


 
The nozzle is the energy gathering device of the jet, which is the key component to ensure the quality of the jet, and its function is to control the pressure, flow and shape of the high-pressure water jet. The commonly used high-pressure nozzle structure mainly has three forms: cylindrical, fan and rotating nozzle, which can form different jet characteristics.
 
The greater the impact force of high-pressure water jet sprayed to the surface of the object, the more concentrated and the faster the speed, the better the cleaning effect. These effects are determined by several factors such as nozzle pressure, water jet velocity, jet Angle and shape, which are also determined by the shape of the nozzle orifice and the size of the aperture. Therefore, the choice of nozzle structure form is very important, which directly determines the quality and efficiency of car cleaning. Below we will briefly introduce the nozzle characteristics of these three structural forms.
 
The nozzle structure of the high pressure cleaning machine in the cleaning car application is selected:
 
1, cylindrical nozzle
 
The cylindrical nozzle can produce a concentrated impact force and is suitable for cleaning hard dirt. However, due to its minimal injection Angle, the water jet sprayed out covers a small area.
 
2. Fan nozzle
 
The spraying area of the fan-shaped nozzle is wide, and the nozzle can spray water out at a maximum Angle of 45 degrees, thus increasing the coverage of the high-pressure water jet, but the impact force loss of the high-pressure water jet to the surface of the object is great.
 
3. Rotate the nozzle
 
The rotating nozzle is characterized by combining the advantages of the fan nozzle and the circular nozzle into one, and can do linear motion even when rotating at high speed, and can spray out high-pressure water jets with large coverage and strong impact force.
 
In summary, we can see that the rotating nozzle not only ensures the concentrated impact force, but also expands the coverage of the high-pressure water jet, so it has a good effect on cleaning the car