Drill bit with anti-blocking function

Abstract

The utility model relates to a drill bit with an anti-blocking function, which comprises a drill bit body, a plurality of blades are arranged outside the drill bit body, a plurality of cutting bodies are uniformly distributed on the top surfaces of the blades, a main flow channel for drilling fluid to flow is arranged in the drill bit body, and a plurality of water holes staggered with the blades are arranged below the main flow channel and on the top surface of the drill bit body. A plurality of expansion mechanisms are arranged on the side wall of the water hole, and a plurality of auxiliary flow channels are formed in the side face of the main flow channel. The drill bit is reasonable in structure, when the water hole is blocked by chippings, the water hole can be expanded through the expansion mechanism under the impact force of drilling fluid, so that the chippings are separated from the water hole, and the situation that the drill bit is blocked due to the fact that the water hole is blocked is reduced.

Description

Technical Field

[0001] The utility model relates to the field of PDC drill bits, in particular to a drill bit with an anti-blocking function. Background Art

[0002] PDC drill bit is a composite drill bit used for geological survey, coal drilling and oil exploration. PDC drill bit is mainly composed of drill bit, cutting body, nozzle, gauge surface and joint, etc. It is mainly suitable for soft to medium hard formations. PDC drill bit needs to use drilling fluid to clean and cool the cutting body when working, and the drilling fluid can take away the debris generated by cutting when it is extracted. When cutting, the existing PDC drill bit may get the debris stuck in the water hole, making it difficult for the subsequent drilling fluid to be discharged through the water hole, thus causing the drill bit to be blocked and need to be removed for cleaning, reducing work efficiency. Utility Model Content

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the utility model provides a drill bit with an anti-blocking function.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a drill bit with an anti-blocking function, including a drill bit body, a plurality of blades are arranged outside the drill bit body, a plurality of cutting bodies are evenly distributed on the top surfaces of the blades, a main flow channel for the circulation of drilling fluid is arranged in the drill bit body, a plurality of water holes arranged alternately with the blades are arranged below the main flow channel and on the top surface of the drill bit body, a plurality of expansion mechanisms are arranged on the side walls of the water holes, and a plurality of secondary flow channels are opened on the side surfaces of the main flow channel.

[0005] Preferably, a one-way valve is provided in the secondary flow channel to prevent the drilling fluid from carrying debris into the secondary flow channel when the drilling fluid is extracted, thereby avoiding blockage of the flow channel due to debris.

[0006] Preferably, the one-way valve includes a valve and a rotating shaft rotatably connected to the valve. A check groove is provided in the secondary flow channel directly below the valve. When the injection of drilling fluid is stopped, the valve is located in the check groove. When the drilling fluid is extracted, if the drilling fluid impacts the one-way valve, the check groove can bear part of the impact force for the rotating shaft, thereby increasing the service life of the one-way valve.

[0007] Preferably, the expansion mechanism is evenly distributed on the side of the water eye, and the expansion mechanism includes a slide groove located on the side of the water eye. A slider is provided in the slide groove and is fixedly connected to the drill bit body through a reset spring. The slider is fixedly connected to the arc-shaped slider through a connecting piece. If debris is blocked in the water eye, the impact force of the injected drilling fluid will drive the debris and the arc-shaped slider to move obliquely downward, thereby expanding the water eye and flushing the debris out.

[0008] Preferably, there are four expansion mechanisms to cope with debris that are engaged at multiple angles.

[0009] Preferably, a stop strip integrally formed with the drill bit body is provided on the top surface of the expansion mechanism. When the drilling fluid flushes downward and there is no blockage in the water eye, the expansion mechanism will not be driven downward by the impact force of the drilling fluid.

[0010] Preferably, the movable distance of the slider is equal to the length of the bottom surface of the arc-shaped slider from the drill bit body.

[0011] The beneficial effects of the present utility model are as follows: when the water eye is blocked by debris, the impact force of the drilling fluid can expand the water eye through the expansion mechanism, so that the debris can be separated from the water eye, reducing the drill bit blockage caused by the blocked water eye. In addition, the one-way valve prevents the drilling fluid carrying debris from entering the main flow channel through the secondary flow channel, and the anti-reverse groove can bear part of the impact force for the rotating shaft, improving the service life of the one-way valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present utility model will be further described below with reference to the drawings and embodiments.

[0013] Figure 1 is a cross-sectional view of the present utility model;

[0014] Figure 2 is a bottom view of the present utility model;

[0015] Figure 3 is a bottom view of the expansion mechanism of the present utility model during use;

[0016] Figure 4 is Figure 1 a partial enlarged view of part A in

[0017] In the figure, 1, drill bit body; 2, main flow channel; 3, blade; 4, cutting body; 5, secondary flow channel; 6, water eye; 7, expansion mechanism; 8, one-way valve; 9, valve; 10, rotating shaft; 11, anti-reverse groove; 12, return spring; 13, slider; 14, connecting piece; 15, arc-shaped slider; 16, stop strip; 17, chute. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] All features disclosed in this specification, or all steps in any method or process disclosed, except for mutually exclusive features and / or steps, can be combined in any manner.

[0019] Any feature disclosed in this specification (including any additional claims, abstract, and drawings), unless specifically stated otherwise, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically stated otherwise, each feature is only an example of a series of equivalent or similar features.

[0020] Such as Figures 1-4A drill bit with an anti-blocking function as shown, including a drill bit body 1, several cutter wings 3 are arranged outside the drill bit body 1, several cutting bodies 4 are evenly distributed on the top surface of the cutter wings 3, a main flow channel 2 for the circulation of drilling fluid is arranged inside the drill bit body 1, several water eyes 6 staggered with the cutter wings 3 are arranged on the top surface of the drill bit body 1 below the main flow channel 2, and several expansion mechanisms 7 are arranged on the side walls of the water eyes 6. Several secondary flow channels 5 are arranged on the side surface of the main flow channel 2.

[0021] A one-way valve 8 is arranged in the secondary flow channel 5. When extracting drilling fluid, it prevents the drilling fluid from carrying debris from entering through the secondary flow channel 5, avoiding the situation of blockage in the flow channel due to debris.

[0022] The one-way valve 8 includes a valve 9 and a rotating shaft 10 rotatably connected to the valve 9. A retaining groove 11 is arranged in the secondary flow channel 5 directly below the valve 9. When the injection of drilling fluid stops, the valve 8 is exactly located in the retaining groove 11. When extracting drilling fluid, if the drilling fluid impacts the one-way valve 8, the retaining groove 11 can bear part of the impact force for the rotating shaft 10, improving the service life of the one-way valve 8.

[0023] The expansion mechanisms 7 are evenly distributed on the side surface of the water eyes 6. The expansion mechanism 7 includes a sliding groove 17 on the side surface of the water eye 6. A slider 13 fixedly connected to the drill bit body 1 through a return spring 12 is arranged in the sliding groove 17. The slider 13 is fixedly connected to an arc-shaped slider 15 through a connecting piece 14. If there is debris blocked in the water eye 6, the impact force of the injected drilling fluid will drive the debris and the arc-shaped slider 15 to move obliquely downward, playing an expanding role on the water eye 6 and flushing the debris outwards.

[0024] There are four expansion mechanisms 7, which can deal with debris stuck at multiple angles.

[0025] A retaining strip 16 integrally formed with the drill bit body 1 is arranged on the top surface of the expansion mechanism 7. When the drilling fluid flushes downward and there is no blockage in the water eye 6, the expansion mechanism 7 will not be driven to move downward by the impact force of the drilling fluid.

[0026] The movable distance of the slider 13 is equal to the length of the bottom surface of the arc-shaped slider 15 from the drill bit body 1.

[0027] This design is ingenious. When the water eye is blocked by debris, the impact force of the drilling fluid can expand the water eye through the expansion mechanism, so that the debris is separated from the water eye, reducing the situation of drill bit blockage caused by the blockage of the water eye. In addition, the one-way valve prevents the drilling fluid carrying debris from entering the main flow channel through the secondary flow channel, and the retaining groove can bear part of the impact force for the rotating shaft, improving the service life of the one-way valve.

[0028] The utility model is not limited to the specific embodiments described above. The utility model extends to any new feature or any new combination disclosed in this specification, as well as to any new combination of steps of any new method or process disclosed.

Claims

1. A drill bit with anti-blocking function, characterized in that: The drill bit body (1) comprises a plurality of blades (3) arranged outside the drill bit body (1), a plurality of cutting bodies (4) evenly distributed on the top surfaces of the blades (3), a main flow channel (2) for the flow of drilling fluid arranged inside the drill bit body (1), a plurality of water holes (6) arranged in an alternating manner with the blades (3) arranged below the main flow channel (2) and on the top surface of the drill bit body (1), a plurality of expansion mechanisms (7) arranged on the side walls of the water holes (6), and a plurality of secondary flow channels (5) opened on the side surfaces of the main flow channel (2).

2. A drill bit with anti-blocking function according to claim 1, characterized in that: A one-way valve (8) is provided in the secondary flow channel (5).

3. A drill bit with anti-blocking function according to claim 2, characterized in that: The one-way valve (8) comprises a valve (9) and a rotating shaft (10) rotatably connected to the valve (9), and a backstop groove (11) is provided in the secondary flow channel (5) directly below the valve (9).

4. A drill bit with anti-blocking function according to claim 1, characterized in that: The expansion mechanism (7) is evenly distributed on the side of the water eye (6), and the expansion mechanism (7) includes a slide groove (17) located on the side of the water eye (6). A slider (13) is provided in the slide groove (17) and is fixedly connected to the drill body (1) via a return spring (12). The slider (13) is fixedly connected to the arc-shaped slider (15) via a connecting piece (14).

5. The drill bit with anti-blocking function according to claim 1, characterized in that: There are four expansion mechanisms (7).

6. A drill bit with anti-blocking function according to claim 1, characterized in that: The top surface of the expansion mechanism (7) is provided with a retaining strip (16) integrally formed with the drill body (1).

7. A drill bit with anti-blocking function according to claim 4, characterized in that: The movable distance of the slider (13) is equal to the length of the bottom surface of the arc-shaped slider (15) from the drill body (1).

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