Rotary sealing device for water supply or air supply system of drilling rig

Abstract

The invention provides a rotary sealing device for a water supply or air supply system of a drilling rig, which includes a rotating shaft, a sleeve is installed outside the rotating shaft, a sealing assembly is arranged between the rotating shaft and the sleeve, and a compensating spring is assembled on the outer retaining ring of the rotating shaft and the sealing assembly between the parts or between the press-fit assembly and the sealing assembly, and the opening of the compensation spring faces the sealing assembly. The invention enables the sealing assembly to automatically compensate the radial gap under the action of the compensation spring after the sealing assembly is worn during the working process, so that the sealing assembly produces axial and radial deformation to achieve the sealing effect; at the same time, the locking position is adjusted The nut compresses the belleville spring multiple times, which can extend the life of the rotary sealing device by 5 to 7 times.

Description

technical field [0001] The invention relates to a horizontal directional drilling machine and a fully hydraulic drilling machine technology for geological drilling in the field of trenchless construction technology, in particular to a rotary sealing device for a water supply or gas supply system of a horizontal directional drilling machine. Background technique [0002] The drilling of the horizontal directional drilling machine is extrusion drilling, that is, the drilling method is that the drill bit squeezes the soil to the radial periphery, and the soil will not be discharged from the ground, so the resistance of the drill bit is very large during the drilling process. The huge friction between the drill bit and the formation will cause the temperature of the contact surface between the drill bit and it to rise sharply, which will change the metallographic structure of the drill tool material and reduce its performance, thereby affecting its hole-forming and pipe-drawing q...

AI Technical Summary

Problems solved by technology

[0003] At present, the common problem of the rotary sealing device used in drilling rigs is that the ability to seal high-pressure air or pressure water is poor. During the long-term rotating dynamic use process, due to the wear of the sealing ring, the high-pressure air or pressure water is easy to flow from the rotating shaft. Leakage between the seal and the seal, thus affecting the normal operation of the equipment

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