SU1441049A1 - Drilling crown bit - Google Patents

Abstract

BACKGROUND OF THE INVENTION The invention relates to the drilling of cores and b. used in the mining industry. The purpose of the invention is to increase the reliability of fastening the incisors, to exclude their leaving on the bottomhole upon leaving one of the combined incisors and the possibility of their reuse. The crown includes a housing 1 with a connecting thread 2, equipped with core and well-forming cutters (P) 4 and 5, the cutting edges of which in plan are aligned with the offset of the well-forming P5 in the direction of the thread 2. On the housing 1 there is a holder 3 installed 5. P 4 with protrusions 6 are made, and P 5 with a reciprocal groove 7 and with the possibility of overlapping width P 4. Projections 6 are placed into the grooves P 5. They form a P 4 and P 5 single block and they block each other and prevent from falling out when crushing one of them. As a result, drilling of the well is prevented by carbide cutters, which has a positive effect on drilling. 2 Il. (Oh (L

Description

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The invention relates to a rock cutting tool, namely, crowns for drilling a core hole, and can be used in the mining industry.

The aim of the invention is to increase the reliability of the attachment of the incisors and the exclusion of their leaving on the bottomhole when one of the combined incisors leaves the building.

FIG. 1 shows the proposed crown, a longitudinal section; in fig. 2 - the same, from the side of the working end.

The drill crown contains a cylindrical body 1 with a connecting thread 2 and a holder 3, in which core-forming and well-forming cutters 4 and 5 are fixed, the cutting edges of which in the plan are installed along one line and with a see-through of the well-forming cutters 5 in the direction of the connecting thread 2. Core-forming the incisors 4 on the outer side surface are made with a protrusion 6, and the well-forming incisors 5 are made with a matching groove 7 on the inner side surface.

The principle of operation of the drill bit is as follows.

Under the action of axial load and torque, core-forming 4 and well-forming 5 cutters are embedded in the drilled rock and destroy it. Destroyed rock is carried by the flushing fluid to the surface.

The drill crown has the following technical advantages: the core and wellbore cutters form a single unit, which increases the reliability of their attachment to the crown; The core and wellbore cutters block each other and prevent them from falling out when one of them is loosened, as a result, the bottom hole is prevented from sintering with carbide cutters, which has a positive effect on drilling performance.

Claims (1)

Invention Formula 15 A drill crown, comprising a housing with a connecting thread, equipped with core and well-forming cutters, the cutting edges of which in the plan are installed along the same line with the displacement of the well-forming cutters towards the connecting thread, the holder mounted 20 on the housing with the possibility of attaching the well-forming cutters, that, in order to increase the reliability of the attachment of the incisors, to exclude their leaving on the bottomhole when one of the combined incisors leaves the line, and to be able to repeat their use, the core the formative incisors are made with a protrusion, and the well-forming ones with a reciprocal groove and the possibility of overlapping the width of the core-forming incisors, the protrusions of the core-forming incisors being placed in the grooves thirty wellbore incisors. Sri-G.2