Drill bit with telescopic blades
A technology of telescopic knives and drill bits, which is used in drill bits, drilling equipment, earth-moving drilling, etc.
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Embodiment 1
[0028] Embodiment 1, a PDC drill bit with a telescopic blade, including a drill body, a nozzle 9, a telescopic blade 1, a locking block 4, a ball seat cover 7, a blocking ball 8, a compression spring 3, a shear screw 6, Linkage bolt 5, cutting tooth 10.
[0029] The connection structure between the telescopic blade 1 and the drill bit body is as follows: firstly, the internal structure of the drill bit body is redesigned. Three fan-shaped grooves are axially opened on the drill body between the fixed blades 2. The cross-section of the fan-shaped grooves has a "T"-shaped structure. The middle of the bottom of each fan-shaped groove is provided with a locking block groove. Set lock block 4. A compression spring or a compression spring sheet 3 is arranged between the locking block 4 and the bottom of the groove of the locking block. Below the bottom of the fan-shaped groove close to the groove of the locking block (note: the upper and lower positions involved in the present inv...
Embodiment 2
[0033]In Embodiment 2, a radial through hole is provided on the telescopic blade 1 corresponding to the locking block 4, so that the locking block 4 can be squeezed through the radial through hole by a tool during the installation of the telescopic blade. It also includes a sealing ring 7-3 at the junction of the ball seat cover 7 and the cylindrical cavity in the drill bit body to increase its sealing performance.
Embodiment 3
[0034] Embodiment 3, the locking block 4 is a one-way sliding wedge-shaped groove, and the groove on the telescopic blade 1 matched with it is a one-way sliding wedge-shaped groove. Of course, the cooperation between the two can also adopt the plug-in locking cooperation form of the protrusion and the groove.
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