| abstract |
In the present invention, an electromagnetic valve is mounted on each of two rows of spray nozzles so as to block the flow of water. When water is not sprayed from the spray nozzle, the flow of water is blocked by the electromagnetic valve, Thereby preventing deterioration of the quality of the head lining, delaying the replacement timing of the injection nozzle, and facilitating maintenance and reducing the replacement cost. Particularly, in the present invention, when water is sprayed from the spray nozzle, the electronic valve is opened a little earlier than the spray time so as not to interfere with the water spray, and when the water spray is finished, the electronic valve is closed a little later, Or falling down. |