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1. WO2020114699 - A DRILLING STRING, THREADED COUPLING, AND ROD ADAPTOR FOR ROTARY DRILLING

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Claims

1. A drill string (400) for rotary drilling of underground mining machines comprising: a first elongate drill string member (100) having a main section (101) and a male end (102);

a second elongate drill string member (100) having a main section (101) and a female end (103);

the male end (102) and the female end (103) have respective threads to provide a thread coupling (401) between the male end (102) and the female end (103), the thread coupling (401) enables the male end (102) to be secured inside the female end (103) such that the male end (102) and the female end (103) overlap axially;

wherein a thread lead (L2) of the respective threads of the male end (102) and the female end (103) is greater than a diameter (DM; DFI) of the male end (102) and the female end (103).

2. The drill string (400) according to claim 1, wherein the respective threads of the male end (102) and the female end (103) are multi-start threads.

3. The drill string (400) according to claim 1, wherein the respective threads of the male end (102) and the female end (103) are double-start threads.

4. The drill string (400) according to claim 2, wherein the respective threads of the male end (102) and the female end (103) are triple-start threads.

5. The drill string (400) according to any of the preceding claims, wherein the

respective threads of the male end (102) and the female end (103) are right-handed threads.

6. The drill string (400) according to any of the preceding claims, wherein the

respective threads of the male end (102) and the female end (103) are rope threads or trapezoidal threads.

7. The drill string (400) according to claim 2, wherein the respective threads of the male end (102) and the female end (103) has a diameter (DM; DFI) in a range approximately between 16mm and 25mm, and a lead angle (b) of the threads is greater than 17°.

8. The drill string (400) according to any of the preceding claims, wherein the

underground mining machine is a bolting machine or bolter miner.

9. A threaded coupling (401) for connecting drill string members (100) to form a drill string (400) according to any of the preceding claims, wherein the threaded coupling (401) comprises:

a male end (102; 202) having a first axial length (LM);

a hollow female end (103; 303) having a second axial length (LF);

the male end (102; 202) and the female end (103; 303) having respective threads to enable the male end (102; 202) to be secured inside the female end (103; 303) such that at least a part of the first axial length (LM) of the male end (102; 202) and a part of the second axial length (LF) of the female end (103) overlap axially to form the threaded coupling (401).

10. The threaded coupling (401) according to claim 9, wherein the respective threads of the male end (102; 202) and the female end (103; 303) have a diameter (DM; DFI) in a range approximately between 18mm and 25mm, and a lead angle (b) of the threads is greater than 17°.

11. The threaded coupling (401) according to claim 9, wherein a diameter (DM; DFI) of the respective threads of the male end (102; 202) and the female end (103; 303) approximately equals to 16mm, and a lead angle (b) of the threads is greater than 20°.

12. A rod adaptor (200, 300) for a rotary drilling machine, comprising:

a first end (203; 302);

a second end (202; 303), positioned towards a drill string (400) according to any of claims 1 to 8, wherein the second end (202; 303) and a corresponding end (103; 102) of the drill string (400) have respective threads to enable the rod adaptor (200, 300) to be secured to the drill string (400); and

an elongate body (201; 301) extended between the first end (203; 302) and the second end (202; 303).

13. The rod adaptor (200, 300) according to claim 12, wherein the rod adaptor (200, 300) is a drive adaptor (200), the first end (203) of the drive adaptor (200) is positioned towards a drive system (402) of the drilling machine, so that the drive system (402) transmits power to the drive adaptor (200), and further to the drill string (400).

14. The rod adaptor (200, 300) according to any of claims 12 to 13 , wherein the rod adaptor (200, 300) is a bit adaptor (300), the first end (302) of the bit adaptor (300) is positioned towards a drill bit (403) of the drilling machine, so that power transmitted to the bit adaptor (300) is further transmitted to the drill bit (403) for drilling.