Method for improving gas concentration by spraying and leaking stoppage on coal wall and spraying device

The invention relates to the field of coal wall spraying equipment, in particular to a method for improving gas concentration through coal wall spraying and leaking stoppage and a spraying device.The spraying device comprises a spraying gun body, a gas spraying structure is arranged at one end of the spraying gun body, a spraying cavity is formed in the spraying gun body and penetrates through the end close to the gas spraying structure, and an adjusting valve is arranged in the spraying cavity and comprises a valve shell; a valve groove is formed in the valve shell, a valve element is arranged in the valve groove in a matched mode through a spring, two agent guiding ports, a second air port and a first air port which penetrate through the valve groove are formed in the surface of the valve groove, the two agent guiding ports are arranged in the sliding direction of the valve element, and the second air port and the first air port are arranged in the sliding direction of the valve element. The agent valve por