Internal spray sealing device of cantilever type heading machine

The utility model discloses an internal spray sealing device of a cantilever type heading machine. The sealing device comprises a sealing bushing and a sealing shell, and a rotary water seal assemblyand a radial water channel, a plurality of sealing washers are arranged between the sealing bushing and the cutting main shaft; the sealing shell comprises a first sealing shell section and a second sealing shell section; the rotary water seal assembly comprises two rotary water seals arranged on the seal bushing in a sleeving mode and a flow guide ring located between the two rotary water seals,a groove-shaped water channel is formed in the flow guide ring, two flow guide holes are formed in the groove-shaped water channel in the radial direction, and the two flow guide holes are both communicated with the radial water channel. According to the utility model, the flow guide ring can guide internal spray high-pressure water entering the sealed shell into the radial water channel; the tworotary water seals can prev