Punching-shear composite drill bit for hard rock drilling
A composite drill bit, punching and shearing technology, applied in the direction of drill bit, drilling equipment, earthwork drilling and production, etc., can solve the problems that affect the application of percussion rotary drilling technology, high energy consumption, limited service life, etc., to reduce the stick-slip phenomenon of the drill bit, Improve the efficiency of rock breaking and strengthen the effect of self-protection
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[0026] see Figure 1 to Figure 4 , shows the punching-shear composite drill bit for drilling hard rock of the present invention.
[0027] Such as figure 1 and Figure 1A As shown, the punching and shearing composite drill bit for hard rock drilling can include three parts: an impactor 1, an inner punching drill bit 2 and an outer cutting bit 3, and the lower joint of the impactor 1 and the outer cutting bit 3 can be threaded. Form connection, the upper part of the inner punching drill bit 2 is connected with the impactor 1 through a spline, the lower end surface of the inner filling drill bit 2 protrudes from the surface of the outer cutting drill bit 3 and is located on the outer cutting drill bit 3, the inner punching drill bit 2 The central axis of the drill bit 2 is parallel or coincident with the central axis of the circumscribed drill bit 3, and the combination of the set teeth on the inner filled drill bit 2 and the set teeth of the circumscribed drill bit 3 can compl...
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