The laser transmitter emits a rotating beam, forming a light plane on the working plot. This light plane is the reference plane for leveling the land. The light plane can be flat or inclined. The laser receiver is installed on the telescopic rod of the scraper. When the receiver detects the laser signal, it continuously sends signals to the control box. After receiving the signal, the control box makes corrections. The corrected signal controls the hydraulic valve to change the flow direction and flow rate of the hydraulic oil to the cylinder, and automatically controls the height of the scraper.
