Claw-shaped drill bit with rotatable cutting teeth

Abstract

The utility model discloses a claw-shaped drill bit with rotatable cutting teeth, the bottom of the drill bit is connected with a drill rod, a plurality of blades are distributed on the drill bit at intervals, the blades extend from the side edge of the drill bit to the top, a plurality of alloy teeth are arranged on the blades at intervals, and the alloy teeth are movably connected on the blades in the circumferential direction. The claw-shaped drill bit is short in process route and low in production cost; the deslagging space between the blades is large, so that the deslagging efficiency is improved; and the alloy teeth are in clearance fit with the tooth holes and can rotate in the ploughing process, so that the abrasion is uniform.

Description

Technical Field

[0001] This utility model relates to the field of mining drill bit technology, and in particular to a claw-shaped drill bit with rotatable cutting teeth. Background Technology

[0002] When a roller cone drill bit is working, it is driven to rotate by the drill rod. The roller cones revolve around the drill rod while simultaneously rotating on their own axis. Under the weight of the drilling rig, the roller cones roll and crush the rock, and the carbide teeth embedded in the roller cones further crush the rock. Compressed air then blows the crushed rock from the bottom of the hole to the surface at the opening. While this method is highly efficient at breaking up soft formations, the small gap between the roller cones on the drill bit affects the efficiency of cuttings removal. Summary of the Invention

[0003] Purpose of the utility model: In order to overcome the shortcomings of the prior art, this utility model discloses a claw-shaped drill bit with rotatable cutting teeth.

[0004] Technical solution: The present invention discloses a claw-shaped drill bit with rotatable cutting teeth. The bottom of the drill bit is connected to the drill rod. Multiple blades are spaced apart on the drill bit. The blades extend from the side of the drill bit to the top. Multiple alloy teeth are spaced apart on the blades. The alloy teeth are circumferentially connected on the blades.

[0005] Furthermore, the blades are evenly spaced and extend in a spiral shape on the drill bit.

[0006] Furthermore, the drill bit has an air jet hole located in the gap between the blades and is equipped with a nozzle, which extends from the bottom of the drill bit and connects to the air jet power end.

[0007] Furthermore, the alloy teeth located at the top of the cutter wing have an angle of 40° with the tunneling direction, the alloy teeth located at the bottom of the side of the cutter wing have an angle of 90° with the tunneling direction, and the remaining alloy teeth located in the middle of the cutter wing have an angle with the tunneling direction that transitions from 40° to 90°.

[0008] Furthermore, toothed holes are formed on the blade wing, the root of the alloy tooth is embedded in the toothed hole and fits with it with clearance, the tooth head is exposed in the toothed hole, the alloy tooth can rotate in the toothed hole, and a circumferential limiting groove is provided on the side of the tooth root, and axial limiting is achieved by two limiting pins perpendicular to the axis of the alloy tooth.

[0009] Furthermore, the limiting pin is inserted through an opening on the blade surface, and a filler layer is provided at the outer end of the limiting pin.

[0010] Furthermore, the bottom of the drill bit is provided with a threaded portion that connects to the drill rod, and a wrench groove is provided above the threaded portion.

[0011] Beneficial effects: Compared with the existing technology, this utility model relies on alloy teeth to break up the rock strata, and then high-pressure air blows the rock chips out of the hole. The advantages are: the claw-shaped drill bit has a short process route and low production cost; the large slag discharge space between the blades is conducive to improving slag discharge efficiency; the alloy teeth and the tooth holes are clearance fit, and can rotate during the plowing process, resulting in uniform wear; the claw-shaped drill bit, due to the large slag discharge groove space between the blades and the multiple nozzles, can be applied to soft strata mining to improve tunneling efficiency. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the present utility model;

[0013] Figure 2 This is a partial cross-sectional view of the overall structure of the present invention with alloy teeth;

[0014] Figure 3 This is a side sectional view of the alloy teeth and limiting pin of this utility model;

[0015] Figure 4 This is an axial sectional view of the alloy teeth and limiting pins of this utility model;

[0016] Figure 5 This is a schematic diagram of the installation of the alloy teeth and limit pins of this utility model. Detailed Implementation

[0017] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1 The claw-shaped drill bit shown has rotatable cutting teeth. The bottom of the drill bit is connected to the drill rod. Five blades 1 are spaced apart on the drill bit. The blades 1 extend from the side of the drill bit to the top. Multiple alloy teeth 2 are spaced apart on the blades 1. The alloy teeth 2 are circumferentially connected to the blades 1 and can rotate during the tunneling process.

[0019] The blades 1 are evenly spaced and spirally extended on the drill bit. The drill bit has air jet holes 3 and nozzles 4 installed at the gaps between the blades 1. The nozzles 4 extend from the bottom of the drill bit and connect to the air jet power end. The large slag discharge space between the blades is beneficial to improving slag discharge efficiency.

[0020] The installation angle of the alloy teeth 2 on the cutter wing 1 is related to the angle between the cutter wing position and the tunneling direction. The alloy teeth 2 located at the top of the cutter wing 1 have an angle of 40° with the tunneling direction, the alloy teeth 2 located at the bottom side of the cutter wing 1 have an angle of 90° with the tunneling direction, and the remaining alloy teeth 2 located in the middle of the cutter wing 1 have an angle with the tunneling direction that transitions from 40° to 90°.

[0021] like Figure 2-5As shown, the blade wing 1 has a toothed hole 5. The root of the alloy tooth 2 is fitted inside the toothed hole 5 with a clearance fit, and the tooth head protrudes from the toothed hole 5. The alloy tooth 2 can rotate within the toothed hole 5. A circumferential limiting groove 6 is provided on the side of the tooth root, and axial limiting is achieved by two limiting pins 7 perpendicular to the axis of the alloy tooth 2. The limiting pins 7 are inserted through openings on the surface of the blade wing 1, and a filler layer 8 is provided at the outer end of the limiting pin 7.

[0022] The bottom of the drill bit is provided with a threaded part 9 that connects to the drill rod, and a wrench groove 10 is provided above the threaded part 9.

Claims

1. A claw-shaped drill bit with rotatable cutting teeth, the bottom of which is connected to a drill rod, characterized in that: The drill bit is provided with multiple blades (1) spaced apart. The blades (1) extend from the side of the drill bit to the top. Multiple alloy teeth (2) are provided on the blades (1) spaced apart. The alloy teeth (2) are circumferentially connected on the blades (1). The blade (1) has a toothed hole (5), the tooth root of the alloy tooth (2) is embedded in the toothed hole (5) and has a clearance fit with it, the tooth head is exposed in the toothed hole (5), the alloy tooth (2) can rotate in the toothed hole (5), and a circumferential limiting groove (6) is provided on the side of the tooth root, and the axial limiting is achieved by two limiting pins (7) perpendicular to the axis of the alloy tooth (2).

2. The rotary bit according to claim 1, wherein: The blades (1) are evenly spaced and extend in a spiral shape on the drill bit.

3. The rotary bit according to claim 1, wherein: The drill bit has an air jet hole (3) in the gap of the blade (1) and is equipped with a nozzle (4), which extends from the bottom of the drill bit to connect to the air jet power end.

4. The rotary bit according to claim 1, wherein: The alloy teeth (2) located at the top of the blade (1) have an angle of 40° with the tunneling direction, the alloy teeth (2) located at the bottom of the side of the blade (1) have an angle of 90° with the tunneling direction, and the remaining alloy teeth (2) located in the middle of the blade (1) have an angle with the tunneling direction that transitions from 40° to 90°.

5. The rotary bit according to claim 1, wherein: The limiting pin (7) is inserted through an opening on the surface of the blade (1), and a filler layer (8) is provided at the outer end of the limiting pin (7).

6. The rotary bit according to claim 1, wherein: The bottom of the drill bit is provided with a threaded part (9) that connects to the drill rod, and a wrench groove (10) is provided above the threaded part (9).

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