1 results about "Underground tunnel" patented technology

The invention relates to the field of tapping machines and discloses a gearbox device of a speed regulating tapping machine. The gearbox device comprises a pull rod. A gearbox main body is arranged atone end of the pull rod, a direct current slotless and brushless main motor is arranged on the outer surface of one end of the gearbox main body, a main shaft sleeve is arranged on the outer surfaceof one end of the direct current slotless and brushless main motor, a spindle is arranged on the inner side of the main shaft sleeve on one end of the direct current slotless and brushless main motor,a body is arranged on the outer side of the main shaft sleeve on one end of the direct current slotless and brushless main motor, and a hand wheel is arranged at the upper end of the body. Accordingto the gearbox device of the speed regulating tapping machine, uneven stress when a pipe clamp is mounted is prevented, and the gearbox device is prevented from swinging during tapping, so that the tapping quality is better, and the gearbox device is simple in field installation, safe and reliable and convenient for operations under a underground tunnel. The service life of the tapping machine canbe prolonged, and the gearbox device can achieve tapping operations on pipelines of various materials, is suitable for tapping the pipelines of various materials in the current market, and is truly multipurpose.