Underground coal mine directional drilling machine big through hole power head with braking function

The utility model relates to an underground coal mine directional drilling machine big through hole power head with a braking function. According to a nearly horizontal directional drilling construction technology, a drilling machine power head must simultaneously satisfy a rotating drilling technological method and a hole bottom motor directional drilling technological method. The underground coal mine directional drilling machine comprises a motor, a gearbox, a main shaft, a shaft I and a clamping disc. The motor is connected with the main shaft through the gearbox; the clamping disc is placed at the front end of the main shaft; a supporting ring is installed at the rear end of the main shaft to ensure that a drilling rod is located in the center of a main shaft hole; an oil distribution sleeve is sleeved on the main shaft, and is used for providing high-pressure oil for the clamping disc; and a brake is connected on the shaft I through the gearbox to achieve braking of the power head. The underground coal mine directional drilling machine big through hole power head with the braking function is compact in structure, moderate in capability and capable of simultaneously satisfying the rotating drilling technological method and the hole bottom motor directional drilling technological method and being matched with an ordinary drilling rod, a communication cable drilling rod, a spiral drilling rod and a salvage drilling tool, and has strong technological adaptability.