Efficient drilling tool for rotary drilling rig

Abstract

The utility model discloses an efficient drilling tool for a rotary drilling rig, which comprises an outer barrel, a rotating disc is rotatably arranged on the upper portion of the outer barrel, and a connector used for being connected with a drill rod is arranged on the upper portion of the rotating disc. A main drill shaft is arranged in the middle of the lower portion of the rotating disc, a plurality of auxiliary drill shafts are evenly arranged in the circumferential direction at intervals with the main drill shaft as the center, and the circumferential wall of the main drill shaft and the circumferential wall of the auxiliary drill shafts are fixedly sleeved with spiral blades. The lower end of each spiral blade extends to the outer part of the lower end of the outer cylinder body and is provided with a plurality of rotary digging teeth; a limiting connecting ring is fixedly arranged on the inner circumferential wall of the upper end of the outer barrel, and a connecting ring groove is formed in the inner circumferential wall of the limiting connecting ring. Good guidance quality and hole forming quality of spiral drilling are guaranteed, slag discharging is convenient, the capacity and the soil carrying capacity of a drilling tool can be effectively improved, and therefore working efficiency is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of drilling tools for rotary drilling rigs, and in particular to a high-efficiency drilling tool for rotary drilling rigs. Background Technology

[0002] With the rapid development of my country's economy, the scope of infrastructure construction is constantly expanding. Rotary drilling rigs, due to their high efficiency, low pollution, flexibility, and multiple functional combinations, have been widely used in infrastructure construction. For drilling operations in high-water-level dredged sand layers and seabed silt layers, auger drills are a common type of rotary drilling tool. They offer convenient slag removal during operation and have good guidance and hole-forming quality. However, current auger drills have a relatively small capacity and lower soil-carrying capacity than conventional tubular drills, resulting in lower work efficiency. Therefore, a high-efficiency drilling tool for rotary drilling rigs needs to be developed. Utility Model Content

[0003] The purpose of this invention is to provide a high-efficiency drilling tool for rotary drilling rigs, thereby solving the technical problems mentioned in the background section.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This utility model discloses a high-efficiency drilling tool for rotary drilling rigs, comprising an outer cylinder, a rotating disk rotatably mounted on the upper part of the outer cylinder, and a connector for connecting to a drill rod on the upper part of the rotating disk; a main drill shaft is mounted in the middle of the lower part of the rotating disk, and a plurality of auxiliary drill shafts are evenly spaced around the main drill shaft in the circumferential direction; helical blades are fixedly fitted on the circumferential walls of the main drill shaft and the plurality of auxiliary drill shafts, and the lower ends of the helical blades extend to the lower end of the outer cylinder, and the lower ends of the helical blades are respectively provided with a plurality of rotary drilling teeth.

[0006] Furthermore, a limiting connecting ring is fixedly provided on the inner peripheral wall of the upper end of the outer cylinder, and a connecting ring groove is provided on the inner peripheral wall of the limiting connecting ring. A connecting protrusion that matches the connecting ring groove is fixedly provided on the outer peripheral wall of the rotating disk.

[0007] Furthermore, a central gear is rotatably mounted on the part of the main drill shaft located below the rotary disk, and the upper ends of each of the auxiliary drill shafts are rotatably connected to the rotary disk. A secondary gear is fixedly mounted on the part of each of the auxiliary drill shafts located below the rotary disk. One end of each secondary gear meshes with the central gear, and the other end meshes with an internal gear ring fixedly mounted on the inner peripheral wall of the outer cylinder.

[0008] Furthermore, a protective disc is fixedly fitted on the main drill spindle at the position below the central gear, and the protective disc has clearance holes with an inner diameter larger than the outer diameter of each auxiliary drill spindle at the position corresponding to each auxiliary drill spindle.

[0009] Furthermore, the number of auxiliary drill spindles is specifically set to four.

[0010] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0011] In this invention, the rotary disk is connected to the drill rod of a rotary drilling machine via a connector. When the drill rod drives the rotary disk to rotate, the main drill shaft and multiple auxiliary drill shafts rotate together with the rotary disk. The helical blades and rotary drilling teeth on the main drill shaft located in the middle of the rotary disk perform helical drilling at the center of the borehole. As the multiple auxiliary drill shafts rotate together with the rotary disk outside the main drill shaft, each auxiliary gear maintains a meshing relationship with the central gear and the internal gear ring on the outer cylinder. Therefore, each auxiliary gear also drives each auxiliary drill shaft to rotate, thereby causing the helical blades on the multiple auxiliary drill shafts to perform helical drilling around the borehole. Therefore, this invention not only ensures good guidance and hole quality of helical drilling and convenient slag removal, but also effectively improves the drill bit capacity and soil carrying capacity, thereby effectively improving work efficiency. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings.

[0013] Figure 1 A schematic diagram of its structure;

[0014] Figure 2 for Figure 1 Sectional view along the middle AA direction;

[0015] Explanation of reference numerals in the attached drawings: 1. Outer cylinder; 2. Rotary disk; 3. Connector; 4. Limiting connecting ring; 5. Connecting ring groove; 6. Connecting convex ring; 7. Main drill spindle; 8. Secondary rotating shaft; 9. Spiral blade; 10. Rotary drilling tooth; 11. Central gear; 12. Secondary gear; 13. Internal gear ring; 14. Protective disk; 15. Clearance hole. Detailed Implementation

[0016] like Figures 1-2 As shown, a high-efficiency drilling tool for rotary drilling rigs includes an outer cylinder 1. A rotary disk 2 is rotatably mounted on the upper part of the outer cylinder 1. A connector 3 for connecting to a drill rod is fixedly installed on the upper part of the rotary disk 2 by welding. In this embodiment, a limiting connecting ring 4 is fixedly installed on the inner peripheral wall of the upper end of the outer cylinder 1. A connecting ring groove 5 is formed on the inner peripheral wall of the limiting connecting ring 4. A connecting protrusion 6 adapted to the connecting ring groove 5 is fixedly installed on the outer peripheral wall of the rotary disk 2.

[0017] A vertical main drill shaft 7 is installed in the lower center of the rotary disk 2, and multiple auxiliary drill shafts 8 are installed at even intervals around the main drill shaft 7 in the circumferential direction. Helical blades 9 are fixedly sleeved on the peripheral walls of the main drill shaft 7 and the multiple auxiliary drill shafts 8. The lower end of each helical blade 9 extends to the lower outside of the outer cylinder 1, and multiple rotary digging teeth 10 are fixedly provided at the lower end of each helical blade 8.

[0018] In this embodiment, a central gear 11 is rotatably mounted on the part of the main drill shaft 7 located below the rotary disk 2. The number of auxiliary drill shafts 8 is specifically set to four. The upper end of each auxiliary drill shaft 8 is rotatably connected to the rotary disk 2. A secondary gear 12 is fixedly mounted on the part of each auxiliary drill shaft 8 located below the rotary disk 2. One end of each secondary gear 12 meshes with the central gear 11, and the other end meshes with the internal gear ring 13 fixedly installed on the inner peripheral wall of the outer cylinder 1.

[0019] In addition, a protective disc 14 is fixedly mounted on the main drill spindle 7 at the position below the central gear 11. The protective disc 14 has clearance holes 15 with an inner diameter larger than the outer diameter of the auxiliary drill spindle 8 at the positions corresponding to each of the auxiliary drill spindles 8.

[0020] In this invention, the rotary disk is connected to the drill rod of a rotary drilling machine via a connector. When the drill rod drives the rotary disk to rotate, the main drill shaft and multiple auxiliary drill shafts rotate together with the rotary disk. The helical blades and rotary drilling teeth on the main drill shaft located in the middle of the rotary disk perform helical drilling at the center of the borehole. As the multiple auxiliary drill shafts rotate together with the rotary disk outside the main drill shaft, each auxiliary gear maintains a meshing relationship with the central gear and the internal gear ring on the outer cylinder. Therefore, each auxiliary gear also drives each auxiliary drill shaft to rotate, thereby causing the helical blades on the multiple auxiliary drill shafts to perform helical drilling around the borehole. Therefore, this invention not only ensures good guidance and hole quality of helical drilling and convenient slag removal, but also effectively improves the drill bit capacity and soil carrying capacity, thereby effectively improving work efficiency.

[0021] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A high-efficiency drilling tool for rotary drilling rigs, characterized in that: The device includes an outer cylinder, a rotating disk rotatably mounted on the upper part of the outer cylinder, and a connector for connecting to a drill rod on the upper part of the rotating disk; a main drill shaft is mounted in the middle of the lower part of the rotating disk, and multiple auxiliary drill shafts are evenly spaced around the main drill shaft in the circumferential direction. Helical blades are fixedly fitted on the circumferential walls of the main drill shaft and the multiple auxiliary drill shafts. The lower end of each helical blade extends to the lower end of the outer cylinder and the lower end of each helical blade is provided with multiple rotary drilling teeth.

2. The high-efficiency drilling tool for rotary drilling rigs according to claim 1, characterized in that: A limiting connecting ring is fixedly provided on the inner peripheral wall of the upper end of the outer cylinder. The inner peripheral wall of the limiting connecting ring is provided with a connecting ring groove. A connecting protrusion that matches the connecting ring groove is fixedly provided on the outer peripheral wall of the rotating disk.

3. The high-efficiency drilling tool for rotary drilling rigs according to claim 1, characterized in that: The main drill shaft is rotatably fitted with a central gear at the position below the rotary disk. The upper ends of each auxiliary drill shaft are rotatably connected to the rotary disk. Each auxiliary drill shaft is fixedly fitted with an auxiliary gear at the position below the rotary disk. One end of each auxiliary gear meshes with the central gear, and the other end meshes with an internal gear ring fixedly installed on the inner peripheral wall of the outer cylinder.

4. The high-efficiency drilling tool for rotary drilling rigs according to claim 3, characterized in that: The main drill spindle is fixedly fitted with a protective disc at the position below the central gear. The protective disc has clearance holes with an inner diameter larger than the outer diameter of each auxiliary drill spindle at the position corresponding to each auxiliary drill spindle.

5. The high-efficiency drilling tool for rotary drilling rigs according to claim 3, characterized in that: The number of auxiliary drill shafts is specifically set to four.

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