Eccentric drill bit for pipe penetrating while drilling

Abstract

The utility model belongs to the technical field of drill bits, and discloses an eccentric drill bit for penetrating a pipe while drilling. One end of the shaft column is provided with a first round hole coaxially placed with the shaft column, the other end of the shaft column is provided with a second round hole coaxially placed with the shaft column, the central axis of the first round hole is located in the second round hole, and the central axis of the first round hole is close to the hole wall of any side of the second round hole; the first round hole and the second round hole are in through connection through a connecting hole; a first drilling tooth and a plurality of second drilling teeth are fixed to the end, away from the first round hole, of the jack post, the first drilling tooth and the second drilling teeth are located on the outer side of the peripheral wall of the second round hole, one ends of the first drilling tooth and the second drilling teeth are close to the peripheral wall of the second round hole, and the other ends of the first drilling tooth and the second drilling teeth extend to the outer side of the peripheral wall of the jack post; the inserted drainage pipe can be freely inserted into the end, away from the first round hole, of the second round hole, and the problem that in the prior art, the drainage pipe cannot be inserted into the preset position due to the fact that the opening and closing cutter body is clamped or cannot be jacked open is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of drill bits, and particularly relates to an eccentric drill bit for pipe threading while drilling. Background Art

[0002] During the coal mining process, the gas generated brings serious potential safety hazards to the safe production of coal mines. Therefore, during the mining process, it is necessary to extract and dilute the gas in the coal seams containing gas. The main methods of traditional gas extraction and dilution are to use drilling machinery to drill holes several meters to hundreds of meters deep in the coal seams, then extract and retract the drill pipes and drill bits of the drilling machinery, and then insert the gas drainage pipes through the holes. The gas drainage pipes are connected to the gas drainage pumping stations to drain the gas to the ground, thereby reducing the gas content in the coal seams. Since this traditional method requires the drill rods and drill bits to be retracted before the gas drainage pipes can be inserted, the working process is cumbersome and the working efficiency is low. To solve this problem, the prior art has proposed a drill bit that does not require all the drill rods and drill bits to be retracted, such as the Chinese patent with the application number CN201520310911.4, an opening and closing drill bit for a crawler drilling rig, which includes a drill bit body for forming a drilled hole, an opening and closing cutter body arranged on the installation hole connecting the drill bit body and the drill pipe and opening and closing relative to the drill bit body. The opening and closing cutter body is set to be connected to the drill pipe in a snap-fit manner through steel ball catch beans. Through the snap-fit connection between the opening and closing cutter body and the drill pipe, when the gas pipe remains in the hole through the drill pipe, the opening and closing cutter body is pushed open, so that the opening and closing cutter body drives the drill bit body and the drill pipe to withdraw together, and the drill pipe is no longer directly used, so it is convenient for the installation of the gas pipe and improves the drilling efficiency.

[0003] Although the opening and closing cutter body can be rotated and unfolded by pushing it in the above patent to insert the drainage pipe to the required position, in actual use, since the debris of the broken rock may resist the opening and closing cutter body, or the debris may jam the rotating part of the opening and closing cutter body, resulting in the opening and closing cutter body not being able to be pushed open. Therefore, there is a problem in the prior art that the drainage pipe cannot be inserted to the predetermined position due to the opening and closing cutter body being jammed or unable to be pushed open. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the present utility model is to provide an eccentric drill bit for pipe threading while drilling, which solves the problem in the prior art that the drainage pipe cannot be inserted to the predetermined position due to the opening and closing cutter body being jammed or unable to be pushed open.

[0005] The purpose of the present utility model can be realized by the following technical solutions:

[0006] An eccentric drill bit for pipe threading while drilling includes a shaft column;

[0007] One end of the shaft column is provided with a first round hole coaxially placed with the shaft column, and the other end of the shaft column is provided with a second round hole coaxially placed with the shaft column. The central axis of the first round hole is located inside the second round hole, and the central axis of the first round hole is close to the hole wall on any side of the second round hole;

[0008] The first round hole and the second round hole are connected through a connecting hole;

[0009] One first drill tooth and a plurality of second drill teeth are fixed at the end of the shaft column far from the first round hole. The first drill tooth and the second drill teeth are both located outside the circumferential wall of the second round hole. One ends of the first drill tooth and the second drill teeth are both close to the circumferential wall of the second round hole, and the other ends of the first drill tooth and the second drill teeth both extend to the outside of the circumferential wall of the shaft column;

[0010] A discharge groove is provided on the circumferential wall of the end of the shaft column far from the first round hole. The discharge groove is connected to the second round hole;

[0011] The discharge groove is located between the first drill tooth and any one of the second drill teeth;

[0012] A plurality of diamond composite sheets are fixed on both the first drill tooth and the second drill teeth;

[0013] The circumferential wall of the first round hole is provided with a helically distributed thread groove;

[0014] The end parts of the first drill tooth and each second drill tooth extending outside the circumferential wall of the shaft column are all on the same circumference, and the center of this circumference is located on the central axis of the first round hole.

[0015] The beneficial effects of the utility model:

[0016] 1. When driving the drill bit to rotate around the central axis of the first round hole, the inner end of the first drill tooth can perform central crushing work, while the outer end of the first drill tooth and each second drill tooth can normally perform crushing work on the outer area far from the central axis of the first round hole. When drilling to the required position, after stopping driving the drill bit, a drainage pipe can be directly inserted into the first round hole, and the connecting hole connects the first round hole and the second round hole. There is no need for the process of rotating and unfolding the opening and closing tool body in the prior art. The inserted drainage pipe can be freely inserted to the end of the second round hole far from the first round hole, and the problem that the drainage pipe cannot be inserted to the predetermined position due to the opening and closing tool body being stuck or unable to be pushed open in the prior art is solved;

[0017] 2. Through the setting of the discharge groove, it is convenient to discharge rock debris, water or gas in the central area of the drill bit during the drilling process. Description of the drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 is a schematic diagram of the overall structure of the present invention from different perspectives;

[0021] Figure 3 is a schematic cross-sectional structure diagram of the shaft rod of the present invention. Detailed implementation manners

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0023] Herein, in combination with Figures 1 to 3 to describe an embodiment of an eccentric drill bit for use in drilling through pipes while drilling. Specifically, the eccentric drill bit for use in drilling through pipes is configured as a split structure, which has components such as a shaft column 100, a first round hole 101, a second round hole 102, a connection hole 103, a first drill tooth 200, and a second drill tooth 300. When drilling to the required position and stopping driving the drill bit, a drainage pipe can be directly inserted into the first round hole 101, and the connection hole 103 penetrates to connect the first round hole 101 and the second round hole 102. There is no need for the process of rotating and unfolding the opening and closing knife body in the prior art. The inserted drainage pipe can freely insert to the end of the second round hole 102 far from the first round hole 101, and solves the problem in the prior art that the drainage pipe cannot be inserted to the predetermined position due to the opening and closing knife body being stuck or unable to be pushed open.

[0024] Please refer to Figures 1 to 3 , an eccentric drill bit for use in drilling through pipes, including a shaft column 100;

[0025] One end of the shaft column 100 is provided with a first round hole 101 coaxially placed with the shaft column 100, and the other end of the shaft column 100 is provided with a second round hole 102 coaxially placed with the shaft column 100. The central axis of the first round hole 101 is located inside the second round hole 102, and the central axis of the first round hole 101 is close to the hole wall on either side of the second round hole 102;

[0026] The first round hole 101 and the second round hole 102 are connected through a connecting hole 103 in a penetrating manner;

[0027] A first drill tooth 200 and a plurality of second drill teeth 300 are fixed at the end of the shaft column 100 away from the first round hole 101. The first drill tooth 200 and the second drill teeth 300 are both located outside the peripheral wall of the second round hole 102. One end of the first drill tooth 200 and the second drill teeth 300 is close to the peripheral wall of the second round hole 102, and the other end of the first drill tooth 200 and the second drill teeth 300 extends to the outside of the peripheral wall of the shaft column 100;

[0028] Since the inner end of the first drill tooth 200 is closer to the central axis of the first round hole 101 than each of the second drill teeth 300, when driving the drill bit to rotate around the central axis of the first round hole 101, the inner end of the first drill tooth 200 can perform central crushing work, while the outer end of the first drill tooth 200 and each of the second drill teeth 300 can normally perform crushing work on the outer area away from the central axis of the first round hole 101. When drilling to the required position, after stopping driving the drill bit, a drainage pipe can be directly inserted into the first round hole 101, and the connecting hole 103 connects the first round hole 101 and the second round hole 102 in a penetrating manner. There is no need for the process of rotating and unfolding the opening and closing knife body in the prior art. The inserted drainage pipe can freely insert to the end of the second round hole 102 away from the first round hole 101, and solves the problem in the prior art that the drainage pipe cannot be inserted to the predetermined position due to the opening and closing knife body being stuck or unable to be opened.

[0029] In order to improve the discharge efficiency of the rock debris in the central area, a discharge groove 104 is provided on the peripheral wall of the end of the shaft column 100 away from the first round hole 101. The discharge groove 104 is connected to the second round hole 102 in a penetrating manner; so as to facilitate the discharge of rock debris, water or gas, etc. in the central area of the drill bit during the drilling process, and at the same time, the gap between adjacent drill teeth can also be used to discharge rock debris.

[0030] The discharge groove 104 is located between the first drill tooth 200 and any one of the second drill teeth 300; so as to facilitate the timely discharge of the debris in the central crushing area.

[0031] A plurality of diamond composite sheets 400 are fixed on both the first drill tooth 200 and the second drill teeth 300; so as to improve the wear resistance of the first drill tooth 200 and the second drill teeth 300.

[0032] The peripheral wall of the first round hole 101 is provided with a helically distributed thread groove 105; through the setting of the thread groove 105, it is convenient for the drill bit and the driving device to be assembled and connected, and at the same time, it is also convenient for the drill bit and the drill pipe to be connected;

[0033] Preferably, the drill pipe can be set as a rod-shaped column with a hollow interior. One end of the drill pipe is inserted into the first round hole 101 and is threadedly connected to the thread groove 105. The drill pipes can be spliced with each other to extend the drilling depth.

[0034] The end portions of the first drill teeth 200 and each of the second drill teeth 300 extending outside the circumferential wall of the shaft column 100 are all located on the same circumference, and the center of this circumference is located on the central axis of the first circular hole 101; so as to improve the crushing work efficiency of the outer region.

[0035] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. An eccentric bit for drilling through pipes while drilling, comprising a shaft column (100), characterized in that: One end of the shaft column (100) is provided with a first circular hole (101) coaxially placed with the shaft column (100), and the other end of the shaft column (100) is provided with a second circular hole (102) axially placed with the shaft column (100). The central axis of the first circular hole (101) is located inside the second circular hole (102), and the central axis of the first circular hole (101) is close to the hole wall on either side of the second circular hole (102). The first circular hole (101) and the second circular hole (102) are connected through a connecting hole (103). A first drill tooth (200) and a plurality of second drill teeth (300) are fixed at the end of the shaft column (100) away from the first circular hole (101). Both the first drill tooth (200) and the second drill teeth (300) are located outside the circumferential wall of the second circular hole (102). One end of the first drill tooth (200) and the second drill teeth (300) is close to the circumferential wall of the second circular hole (102), and the other end of the first drill tooth (200) and the second drill teeth (300) extends outside the circumferential wall of the shaft column (100).

2. The eccentric bit for use in drilling through pipes while drilling, as claimed in claim 1, wherein A discharge groove (104) is provided on the circumferential wall of the shaft column (100) at the end away from the first circular hole (101), and the discharge groove (104) is connected to the second circular hole (102) in a through manner.

3. The eccentric bit for use in drilling through pipes while drilling according to claim 2, characterized in that, The discharge groove (104) is located between the first drill tooth (200) and any one of the second drill teeth (300).

4. The eccentric bit for drilling through pipes while drilling according to claim 3, characterized in that, A plurality of diamond composite sheets (400) are fixed on both the first drill tooth (200) and the second drill teeth (300).

5. The eccentric drill bit for use in drilling through pipes while drilling, according to claim 4, wherein The circumferential wall of the first circular hole (101) is provided with a helically distributed thread groove (105).

6. The eccentric drill bit for drilling through pipes while drilling according to claim 5, characterized in that, The ends of the first drill tooth (200) and each of the second drill teeth (300) extending outside the circumferential wall of the shaft column (100) are on the same circumference, and the center of this circumference is located on the central axis of the first circular hole (101).

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