Power head of directional drill

A power head of a directional drill, comprising a main motor, a gearbox, a main shaft, an active drill pipe and a water swivel, wherein the main motor is connected with the main shaft through the gearbox, and one end of the main shaft is circumferentially and fixedly connected with the active drill pipe;

• the present invention is characterized in that:
• the power head also comprises a connecting shaft and a connecting sleeve, the water swivel comprises a mandrel, a water inlet assembly, a bearing seat, a sealing shaft and mandrel support bearings, the water inlet assembly is sheathed on and rotationally connected with the mandrel, and the bearing seat is sheathed on and rotationally connected with the mandrel through the mandrel support bearings which are arranged in both ends of the bearing seat;
• the mandrel is a hollow shaft, a left end of the mandrel is fixedly connected with the connecting shaft, an inner side of a right end of the mandrel is connected with the sealing shaft to seal the right end of the mandrel, the mandrel has a water inlet hole, the water inlet hole is communicated with the water inlet assembly, the water inlet assembly comprises a water inlet and a shell communicated with the water inlet, an inner cavity of the shell has a symmetrical structure with a plane of symmetry perpendicular to an axis of the mandrel so as to make the shell uniformly stressed in an axial direction, the water inlet assembly is sheathed on the mandrel through the shell, and the inner cavity of the shell is communicated with the water inlet hole of the mandrel;
• the connecting shaft is a hollow shaft and is arranged in the main shaft, both ends of the connecting shaft are connected with the mandrel and the active drill pipe having an axial floating structure, respectively, a hexagonal head is arranged on one end of the connecting shaft close to the mandrel, the connecting sleeve is fixedly connected with one end of the main shaft close to the water swivel and is sheathed on the connecting shaft, and a hexagonal hole matched with the hexagonal head is formed in the connecting sleeve to form a sliding connection between the connecting shaft and the connecting sleeve to limit rotation, thus to enable the connecting shaft and the mandrel to float axially.

A power head of a directional drill, comprising a main motor, a gearbox, a main shaft, an active drill pipe and a water swivel, wherein the gearbox is provided with a driving shaft, one end of the driving shaft is connected with the main motor, the driving shaft is engaged with the main shaft through a gear in the gearbox, and one end of the main shaft is circumferentially and fixedly connected with the active drill pipe;

• the present invention is characterized in that:
• the other end of the driving shaft is connected with an angle adjuster through the gearbox;
• the angle adjuster comprises a transmission shaft, a fixed toothed disk, a moving toothed disk, a rotary seat and a rotary speed reducer with a self-locking function, one end of the transmission shaft is circumferentially and fixedly connected with the driving shaft, the fixed toothed disk and the moving toothed disk are sheathed on the transmission shaft, the fixed toothed disk is engaged with the moving toothed disk through skewed teeth, the fixed toothed disk is circumferentially and fixedly connected with the transmission shaft, the moving toothed disk is rotationally connected with the transmission shaft, and the moving toothed disk can slide along an axial direction of the transmission shaft;
• the rotary seat is sheathed on and circumferentially and fixedly connected with the moving toothed disk, and an output disk of the rotary speed reducer is coaxially and fixedly connected with the rotary seat to transfer rotation of the output disk of the rotary speed reducer to the moving toothed disk;
• the power head of a directional drill also comprises a connecting shaft and a connecting sleeve, the water swivel comprises a mandrel, a water inlet assembly, a bearing seat, a sealing shaft and mandrel support bearings, the water inlet assembly is sheathed on and rotationally connected with the mandrel, and the bearing seat is sheathed on and rotationally connected with the mandrel through the mandrel support bearings which are arranged in both ends of the bearing seat;
• the mandrel is a hollow shaft, a left end of the mandrel is fixedly connected with the connecting shaft, an inner side of a right end of the mandrel is connected with the sealing shaft to seal the right end of the mandrel, the mandrel has a water inlet hole, the water inlet hole is communicated with the water inlet assembly, the water inlet assembly comprises a water inlet and a shell communicated with the water inlet, an inner cavity of the shell has a symmetrical structure with a plane of symmetry perpendicular to an axis of the mandrel so as to make the shell uniformly stressed in an axial direction, the water inlet assembly is sheathed on the mandrel through the shell, and the inner cavity of the shell is communicated with the water inlet hole of the mandrel;
• the connecting shaft is a hollow shaft and is arranged in the main shaft, both ends of the connecting shaft are connected with the mandrel and the active drill pipe having an axial floating structure, respectively, a hexagonal head is arranged on one end of the connecting shaft close to the mandrel, the connecting sleeve is fixedly connected with one end of the main shaft close to the water swivel and is sheathed on the connecting shaft, and a hexagonal hole matched with the hexagonal head is formed in the connecting sleeve to form a sliding connection between the connecting shaft and the connecting sleeve to limit rotation, thus to enable the connecting shaft and the mandrel to float axially.