Abstract
Background: From the view of field application, the working performance and service life of rotary seal device is a determinant factor for successful application of high-pressure water-jet assistance action in coal mining, roadway construction, oil drilling, etc.
Objective: To apply the high-pressure water-jet technology in coal-rock mining and drilling equipment, the patent of novel rotary sealing device for high-pressure water is developed for improving its reliability and service life. Methods: The patent of sealing device is installed after the reducer output-shaft of water-jets assisted roadheader, whose aim is to reduce the slip rate of contact surface between O-ring and sealing shaft for extending the service life of sealing material. In addition, the sealing device is developed uses four sealing sleeves, which can improve its reliability and service life. Results: The working performance of rotary sealing device was investigated under different seal ring, water pressure and rotate speed of sealing shaft, and the results show that the static and dynamic sealing performance of Teflon seal ring are all better than that of Chemigum seal ring. With increasing water pressure, the torque of sealing shaft increases slowly when the water pressure is less than 30MPa, but it accelerates when the water pressure exceeds 30MPa. Conclusions: The Teflon O-ring and combined seal ring are better suited for high-pressure water sealing, and the normal working pressure is advised to be less than 30MPa. The leakage volume rate of rotary sealing device increases slowly with rotating speed of sealing shaft according to exponential function, and water pressure changes little when the rotate speed is lower than 70r/min. The patent on dynamic rotary sealing device for high-pressure water can enhance the service life of seal rings about 15 times than that of the present inner spray system.Keywords: High-pressure water, leakage volume rate, roadheader, rotary sealing device, seal ring, water-jet.
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