Drilling tool float valve element supported by spring set

A drilling tool float valve element supported by a spring set comprises a valve sleeve, a valve rod, a supporting sleeve, a guide sleeve and a spring, the valve sleeve is composed of a sealing seat, a supporting seat and a connecting rod, an inwards-concave conical surface is arranged on the inner side of the sealing seat, a conical cap body is arranged at the front end of the valve rod, and the front end face of the conical cap body is an outwards-convex conical surface matched with the inwards-concave conical surface in a sealing mode. The tail end of the valve sleeve is provided with a guide rod, the supporting sleeve is installed at the upper end of the guide rod, the guide sleeve is arranged on the lower portion of the valve sleeve, the center of the guide sleeve is provided with a guide hole correspondingly matched with the guide rod, the guide rod is inserted into the guide hole in a matched mode, and the spring combination forms a spring set to be supported between the supporting sleeve and the guide