The road roller works as follows:
1, the roller is a method of using mechanical weight and vibration to repeatedly load the compacted material to overcome the cohesion and internal friction between materials. Wheel roller adopts hydraulic, hydraulic or mechanical transmission system, single shaft or full shaft drive, wide base tire articulated frame structure three-point support. The compaction process has the effect of kneading, so that the particles of the compaction layer are not destroyed and embedded, and are uniformly dense. Good maneuverability, fast speed (up to 25 km/h).
2, exclude the gas and water inside, force the displacement between the material particles, wedge each other, increase the compactness, so that it reaches a certain degree of compactness and flatness of the operating machinery.
The pilot solenoid valve is the spare valve of the road roller and the aerial vehicle. When powered on, the valve stem is lifted by the electromagnetic force and the pilot valve port is opened. At this time, the upper chamber of the solenoid valve depressurized through the pilot hole, forming a low and high pressure difference around the main valve spool. When the power is off, under the action of spring force and main spool gravity, the valve stem is reset, the pilot hole is closed, the main spool is moved down, and the main valve port is closed; The pressure in the upper chamber of the solenoid valve increases, the fluid pressure pressurizes the main spool, and the seal is better.