Broaching casing-following drilling tool

Abstract

The utility model relates to the technical field of reaming drilling tools, and discloses a reaming simultaneous casing drilling tool which comprises a drilling rod, a main drill bit is installed on the outer surface of the bottom of the drilling rod, a concentric-square-shaped frame is arranged on the outer surface of the drilling rod, an eccentric drill bit is installed at one end of the concentric-square-shaped frame, and a first hollow cavity is formed in the drilling rod. Two connecting plates are arranged in the first hollow cavity, the other ends of the two connecting plates are fixedly connected with limiting blocks, a plurality of limiting holes are formed in the inner wall of the concentric-square-shaped frame, through holes allowing the limiting blocks to pass through are formed in the outer surface of the drill rod, and two adjusting screws penetrate through the outer surface of the drill rod in a threaded mode. According to the chambering casing-following drilling tool, the concentric-square-shaped frame is arranged to be matched with the spring, the adjusting screw and the connecting plate, so that the limiting block is inserted into the limiting hole, the concentric-square-shaped frame and the drilling rod are limited, the diameter formed by the eccentric drill bit is adjusted, the chambering diameter is adjusted, and use is convenient.

Description

Technical Field

[0001] This utility model relates to the field of hole reaming drill technology, specifically a hole reaming and casing drilling tool. Background Technology

[0002] Down-the-hole drills are mainly used in drilling and blasting operations in soft rock layers and under overlying rock layers. Because the upper rock layer is soft or has a layer of covering material, it is impossible to drill out a shaped hole during drilling and blasting. The hole must be fixed and shaped in the upper loose rock layer before deeper drilling can be carried out.

[0003] In the process of casing drilling, eccentric reaming casing drilling tools are usually used. During the drilling process, the drill bit can drill into the soil layer, and the eccentric drill can enlarge the hole drilled by the drill bit. However, the common eccentric drill cannot be adjusted, resulting in the diameter of the enlarged hole being a fixed single size, which cannot meet different needs in practice. Therefore, a reaming casing drilling tool is proposed. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a hole-reaming and casing-following drill bit to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a reaming and casing drilling tool, comprising a drill rod, a main drill bit mounted on the bottom outer surface of the drill rod, a spiral frame provided on the outer surface of the drill rod, an eccentric drill bit mounted on one end of the spiral frame, a first hollow cavity opened inside the drill rod, two connecting plates provided inside the first hollow cavity, a limit block fixedly connected to the other end of the two connecting plates, a plurality of limit holes opened on the inner wall of the spiral frame, a through hole for the limit block to pass through on the outer surface of the drill rod, and two adjusting screws threaded through the outer surface of the drill rod.

[0006] Furthermore, a second hollow cavity is formed inside the drill rod, and a ash discharge hole is formed on the outer surface of the main drill bit. One end of the ash discharge hole is fixedly connected to an ash discharge pipe, and the other end of the ash discharge pipe is fixedly connected to the second hollow cavity. A connecting pipe is fixedly connected inside the second hollow cavity.

[0007] Furthermore, several drill bits are fixedly connected to the outer surfaces of both the main drill bit and the eccentric drill bit.

[0008] Furthermore, a sliding rod is fixedly connected inside the first hollow cavity, and both connecting plates are movably sleeved on the outer surface of the sliding rod.

[0009] Furthermore, a spring is fixedly connected between the two connecting plates, and the spring is sleeved on the outside of the slide rod.

[0010] Furthermore, the two connecting plates are staggered, and the two adjusting screws are respectively attached to the connecting plate on the opposite side.

[0011] Furthermore, the bottom of the main drill bit is a rectangular structure adapted to the loop frame.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This reaming and casing drilling tool, by setting up a loop frame in conjunction with a spring, adjusting screws and connecting plate, allows the limiting block to be inserted into the limiting hole, limiting the loop frame and drill rod, thereby adjusting the diameter of the eccentric drill bit, and thus adjusting the diameter of the reamed hole, making it easy to use.

[0014] 2. This hole-reaming and casing drilling tool is connected to the connecting pipe via a dust extraction device, which allows soil clods to be discharged from the ash discharge hole and ash discharge pipe during drilling, so that there will not be too many soil clods in the drilled hole, which would affect the drilling work. Attached Figure Description

[0015] Figure 1 This is a front view structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the spiral frame and related structures of this utility model;

[0017] Figure 3 This is a partial side sectional view of the present invention.

[0018] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0019] In the diagram: 1. Drill rod; 2. Main drill bit; 3. Recurve frame; 4. Eccentric drill bit; 5. Connecting plate; 6. Limiting block; 7. Limiting hole; 8. Adjusting screw; 9. Spring; 10. Ash discharge hole; 11. Second hollow cavity; 12. Ash discharge pipe; 13. Connecting pipe; 14. Drill nail. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1:

[0022] Please refer to the following: Figures 1-4This utility model provides a technical solution: a hole-reaming and casing-following drill bit, including a drill rod 1, a main drill bit 2 mounted on the bottom outer surface of the drill rod 1, a U-shaped frame 3 provided on the outer surface of the drill rod 1, an eccentric drill bit 4 mounted on one end of the U-shaped frame 3, a first hollow cavity opened inside the drill rod 1, two connecting plates 5 arranged inside the first hollow cavity, and a limiting block 6 fixedly connected to the other end of the two connecting plates 5, multiple limiting holes 7 opened on the inner wall of the U-shaped frame 3, a through hole for the limiting block 6 to pass through on the outer surface of the drill rod 1, and two adjusting screws 8 threaded through the outer surface of the drill rod 1. Specifically, the drill rod 1 is driven to rotate by an external drive device, and the drill rod 1 drives the main drill bit 2 to rotate. During drilling, the eccentric drill bit 4 is rotated to enlarge the hole. When the hole diameter needs to be adjusted, the adjusting screw 8 is rotated, causing it to move outward from the drill rod 1. This releases the limiting plate 5, causing the limiting block 6 to disengage from the limiting hole 7, thus releasing the limiting between the drill rod 1 and the loop frame 3. The position between the drill rod 1 and the loop frame 3 is adjusted so that the corresponding limiting hole 7 aligns with the through hole. The adjusting screw 8 is then tightened, causing the adjusting screw 8 to move the connecting plate 5, causing the limiting block 6 to extend from the through hole and enter the limiting hole 7 to limit the drill rod 1 and the loop frame 3. This adjusts the diameter formed by the eccentric drill bit 4, thereby adjusting the diameter of the enlarged hole for easier use.

[0023] In this embodiment, a second hollow cavity 11 is formed inside the drill rod 1, and a ash discharge hole 10 is formed on the outer surface of the main drill bit 2. One end of the ash discharge hole 10 is fixedly connected to an ash discharge pipe 12, and the other end of the ash discharge pipe 12 is fixedly connected to the second hollow cavity 11. A connecting pipe 13 is fixedly connected inside the second hollow cavity 11. Specifically, during the drilling process, an external dust collection device is connected to the connecting pipe 13 to generate suction from the ash discharge pipe 12 and suck up the soil clods through the ash discharge hole 10, so that there will not be too many soil clods in the drilled hole, which would affect the drilling work.

[0024] In this embodiment, a number of drill nails 14 are fixedly connected to the outer surfaces of both the main drill bit 2 and the eccentric drill bit 4. Specifically, the drill nails 14 facilitate the drilling work of the main drill bit 2 and the eccentric drill bit 4.

[0025] In this embodiment, a sliding rod is fixedly connected inside the first hollow cavity, and two connecting plates 5 are movably sleeved on the outer surface of the sliding rod. Specifically, the connecting plates 5 slide on the outer surface of the sliding rod when they move, so that the connecting plates 5 can move in a stable linear motion.

[0026] In this embodiment, a spring 9 is fixedly connected between the two connecting plates 5. The spring 9 is sleeved on the outside of the slide rod. Specifically, when the spring 9 is reset, it drives the two connecting plates 5 to move closer to each other.

[0027] In this embodiment, the two connecting plates 5 are staggered, and the two adjusting screws 8 are respectively attached to the connecting plate 5 on the opposite side. Specifically, when the adjusting screws 8 are tightened, the opposite connecting plate 5 can be driven to drive the limiting block 6 to be inserted into the limiting hole 7.

[0028] In this embodiment, the bottom of the main drill bit 2 is a rectangular structure that is adapted to the loop frame 3. Specifically, by adapting the rectangular structure to the loop frame 3, the main drill bit 2 rotates, causing the rectangular end to rotate and thus providing a stable gripping force for the eccentric drill bit 4 during rotation.

[0029] Working Principle: In use, this utility model uses an external drive device to rotate the drill rod 1, which in turn drives the main drill bit 2 to rotate for drilling. The eccentric drill bit 4 rotates to enlarge the hole. When the hole diameter needs adjustment, the adjusting screw 8 is rotated, causing it to move outwards from the drill rod 1. This releases the limiting position on the connecting plate 5, causing the spring 9 to reset and the limiting block 6 to disengage from the limiting hole 7. This releases the limiting position between the drill rod 1 and the loop frame 3, adjusting their positions so that the corresponding limiting hole 7 aligns with the through hole. Tightening the adjusting screw 8 causes it to move the connecting plate 5, causing the limiting block 6 to extend from the through hole and enter the limiting hole 7, thus limiting the drill rod 1 and the loop frame 3. This adjusts the diameter of the eccentric drill bit 4, thereby adjusting the diameter of the enlarged hole for ease of use.

[0030] During the drilling process, an external dust collection device is connected to the connecting pipe 13 to generate suction from the ash discharge pipe 12 and suck up the soil clods through the ash discharge hole 10, so that there will not be too many soil clods in the drilled hole, which would affect the drilling work.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A reaming and casing drill bit, comprising a drill rod (1), characterized in that: The drill rod (1) has a main drill bit (2) installed on its bottom outer surface. The drill rod (1) has a spiral frame (3) on its outer surface. An eccentric drill bit (4) is installed at one end of the spiral frame (3). The drill rod (1) has a first hollow cavity inside. The first hollow cavity has two connecting plates (5) inside. The other ends of the two connecting plates (5) are fixedly connected to a limiting block (6). The spiral frame (3) has multiple limiting holes (7) on its inner wall. The drill rod (1) has a through hole for the limiting block (6) to pass through. The drill rod (1) has two adjusting screws (8) threaded through its outer surface.

2. The reaming and casing drilling tool according to claim 1, characterized in that: The drill rod (1) has a second hollow cavity (11) inside, and the main drill bit (2) has a ash discharge hole (10) on its outer surface. One end of the ash discharge hole (10) is fixedly connected to an ash discharge pipe (12), and the other end of the ash discharge pipe (12) is fixedly connected to the second hollow cavity (11). The second hollow cavity (11) is fixedly connected to a connecting pipe (13).

3. The reaming and casing drilling tool according to claim 1, characterized in that: Both the main drill bit (2) and the eccentric drill bit (4) have several drill pins (14) fixedly connected to their outer surfaces.

4. The reaming and casing drilling tool according to claim 1, characterized in that: A sliding rod is fixedly connected inside the first hollow cavity, and both connecting plates (5) are movably sleeved on the outer surface of the sliding rod.

5. A reaming and casing drilling tool according to claim 1, characterized in that: A spring (9) is fixedly connected between the two connecting plates (5), and the spring (9) is sleeved on the outside of the slide rod.

6. The reaming and casing drilling tool according to claim 1, characterized in that: The two connecting plates (5) are staggered, and the two adjusting screws (8) are respectively attached to the connecting plate (5) on the opposite side.

7. A reaming and casing drilling tool according to claim 1, characterized in that: The bottom of the main drill bit (2) is a rectangular structure that fits the loop frame (3).

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