Hole opening mechanism

The utility model discloses a hole opening mechanism which comprises a pneumatic motor, the output end of the pneumatic motor is provided with a hole opening assembly, the input end of the pneumatic motor is fixedly connected with a gas conveying pipe, one end of the gas conveying pipe is fixedly connected with a gas tank, and the middle of the gas conveying pipe is provided with a refueling assembly used for refueling the pneumatic motor. The first branch pipe, the oil pot and the second branch pipe are additionally arranged on the original basis of the hole opening mechanism, the diameter of the first branch pipe is larger than that of the second branch pipe, when a hole opening machine starts to work, compressed air enters the pneumatic motor through the air conveying pipe, and the compressed air enters the pneumatic motor due to the fact that the first branch pipe on the oil pot is larger than the second branch pipe. Pressure difference can be formed in the oil can, part of compressed air enters the oil c