Answer: When drilling, the feng shui linkage flushing mechanism automatically injects water, and when drilling stops, the water injection stops immediately. Its working principle is as follows: compressed air reaches the front end of the water injection valve from the air chamber of the handle body through the air inlet channel, overcomes the pressure of the spring, and pushes the water injection valve backward, thus opening the waterway. Water from the water pipe and the water hole of the handle body immediately passes through the water needle, and then is injected into the bottom of the hole through the center hole of the drill bit to achieve the purpose of discharging powder and catching dust. When the drilling stops, the compressed air in the handle air chamber disappears. At this point, the compressed air at the front end of the water injection valve returns to the air chamber of the handle and dissipates immediately, so the spring pushes the water injection valve forward and blocks the waterway, so the water injection is stopped. The rock drill is also equipped with a water regulating valve to regulate the water quantity.