Novel cat-claw drill bit with jet structure

Abstract

A novel cat-claw drill bit of a jet structure comprises a drill bit upper body (1), a plurality of supporting plates (2) fixedly arranged on the drill bit upper body (1), cutting tooth bases (3) fixed to the ends of the supporting plates (2) and a plurality of coal cutting teeth (4) fixed to the cutting tooth bases (3). A certain included angle is formed between the orientation of the coal cutting teeth (4) and the feeding direction of drilling of the drill bit; the cutting pick is characterized in that a central air injection hole (5) is formed in the center surrounded by the cutting pick base (3), peripheral air injection holes (6) are formed in the cutting pick base (3) or beside the cutting pick base (3), the peripheral air injection holes (6) are correspondingly located beside the coal cutting teeth (4), and the orientation of the peripheral air injection holes (6) is consistent with that of the corresponding coal cutting teeth (4).

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology for oil and gas and mining drilling, specifically to a novel cat claw drill bit with a jetting structure. Background Technology

[0002] Cat-claw type mining drill bits are generally suitable for open-pit coal mining in soft coal seams (F<1.5) and extremely soft coal seams (1.5>F>0.8). They feature high cutting efficiency, replaceable cutting teeth, and long drill bit body life. The cutting teeth are mounted on the drill bit body and are consumable parts. When a cutting tooth is damaged or severely worn during use, it can be replaced with a new one for continued use.

[0003] Cat claw drill bits generate a large amount of slag during operation. Current slag removal principles involve using high-pressure airflow to blow the slag from the bottom of the hole, which is then carried out by the upward airflow. The airflow system in existing cat claw drill bits is primarily designed at the middle height of the drill bit, such as the central air jet or nozzle. However, this position is still some distance from the bottom of the hole and the cutting teeth. The high-pressure airflow blowing towards the bottom of the hole from this position expands rapidly after leaving the air jet or nozzle, resulting in a lower gas velocity at the bottom and weaker slag removal capability. Furthermore, the airflow blowing towards the bottom of the hole creates convection with the upward airflow, causing interference between the downward and upward airflows. This affects the speed and direction of airflow and slag movement, reducing the slag removal capability of the high-pressure airflow at the bottom of the hole and the upward slag removal capability. Additionally, the downward high-pressure airflow can carry some of the upward-returning slag, eroding the cat claw drill bit and exacerbating wear. In actual use, slag removal within the drill hole may be obstructed, leading to repeated wear of the cutting teeth and their base by the slag. Among the components of a cat claw drill bit, the cutting teeth account for a significant portion of the cost. Poor slag removal will increase the frequency of cutting tooth replacement, thereby increasing the operating cost of the drill bit. The cutting tooth base will deform under the grinding of slag, making it impossible to replace with new cutting teeth. This will lead to premature scrapping of the drill bit base, negating the advantage of cat claw drill bits in extending service life through cutting tooth replacement, and greatly reducing the overall service life of the cat claw drill bit. Summary of the Invention

[0004] This invention provides a novel cat claw drill bit with a jetting structure to solve the problem of poor slag removal in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a novel cat claw drill bit with a jetting structure, comprising a drill bit upper body, multiple support plates fixedly mounted on the drill bit upper body, a cutting tooth base fixed to the end of the support plates, and multiple coal cutting teeth fixed on the cutting tooth base; the orientation of the coal cutting teeth has a certain angle with the feed direction of the drill bit; a central jet hole is provided in the center surrounded by the cutting tooth base, and peripheral jet holes are correspondingly provided on or beside the cutting tooth base, so that the peripheral jet holes are located on the side of the coal cutting teeth, and the orientation of the peripheral jet holes is consistent with the orientation of the corresponding coal cutting teeth.

[0006] In the above scheme, the central jet hole and the peripheral jet hole extend beyond the end face of the support plate and are closer to the end of the drill bit in the axial direction of the drill bit.

[0007] Furthermore, the peripheral jet holes are elongated flat holes, and the length direction of the elongated flat holes is parallel to the arrangement direction of the corresponding multiple coal cutting teeth.

[0008] Furthermore, the upper end of the drill bit is a frustum, and a central airflow channel connecting to the air source is opened at the center of the frustum along its axial direction. A peripheral ventilation groove connecting to the air source is opened on the conical circumference of the frustum corresponding to the position of each of the support plates. The support plate is provided with a support plate airflow channel that connects to the peripheral ventilation groove, and the end of the support plate airflow channel is connected to the peripheral jet hole.

[0009] Furthermore, the peripheral air jet is a peripheral nozzle, which is disposed next to the corresponding cutting tooth base.

[0010] In the above scheme, there are three to five support plates, and each support plate is provided with a cutting tooth base.

[0011] Furthermore, the cutting tooth base is provided with two to six coal cutting teeth arranged in a row.

[0012] Compared with traditional structures, the jet nozzle of this invention is closer to the bottom of the well. The high-pressure airflow quickly reaches the bottom of the well after leaving the jet nozzle, maintaining a relatively high flow velocity. This greatly increases the airflow's ability to clean the slag at the bottom of the well. In addition, the gas jet direction has a certain angle with the bottom of the well, which reduces the interference between the upper and lower airflows compared to vertical jetting. This improves the airflow's ability to clean slag at the bottom of the well and the ability to return slag to the surface, thereby increasing the service life of the cat claw drill bit. Attached Figure Description

[0013] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model;

[0014] Figure 2 for Figure 1 A top-down view;

[0015] Figure 3 This is a schematic diagram of the internal airflow channel of an embodiment of the present invention, where the airflow channel is represented by dashed lines;

[0016] Figure 4 This is a schematic diagram of the upper part of a drill bit with an internal airflow channel according to an embodiment of the present invention;

[0017] Figure 5 This is a three-dimensional schematic diagram of the peripheral nozzle of an embodiment of the present utility model;

[0018] Figure 6 This is a three-dimensional schematic diagram of a support plate with an internal airflow channel according to an embodiment of the present utility model.

[0019] In the above figure:

[0020] 1. Upper part of the drill bit; 11. Central airflow channel; 12. Peripheral ventilation slots; 13. Airflow channel of the support plate;

[0021] 2. Support plate;

[0022] 3. Cutting tooth base;

[0023] 4. Coal cutting teeth;

[0024] 5. Central jet nozzle;

[0025] 6. Peripheral air vents;

[0026] 61. Peripheral nozzles. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0028] Example: See Figure 1-6 As shown, a novel cat claw drill bit with a jetting structure:

[0029] See Figure 1-6 As shown, the novel jetting structure cat claw drill bit includes a drill head upper body 1, multiple support plates 2 fixedly mounted on the drill head upper body 1, a cutting tooth base 3 fixed to the end of the support plate 2, and multiple coal cutting teeth 4 fixed on the cutting tooth base 3. The orientation of the coal cutting teeth 4 has a certain angle with the feed direction of the drill bit. This is the prior art, and the specific angle design is also prior art.

[0030] See Figure 1-6 As shown, the feature of this embodiment is that: a central air jet hole 5 is provided in the center of the cutting tooth base 3, and a peripheral air jet hole 6 is provided on or beside the cutting tooth base 3, so that the peripheral air jet hole 6 is located on the side of the coal cutting tooth 4, and the orientation of the peripheral air jet hole 6 is consistent with the orientation of the corresponding coal cutting tooth 4.

[0031] Specifically, preferably, the central jet hole 5 and the peripheral jet hole 6 are located further towards the end of the drill bit in the axial direction beyond the end face of the support plate 2. This means that the central jet hole 5 and the peripheral jet hole 6 are both located further towards the tip of the drill bit in the axial direction than the end face of the support plate 2, i.e., closer to the bottom of the well during operation.

[0032] See Figure 1-6 As shown, the peripheral jet holes 6 are elongated flat holes, and the length direction of these elongated flat holes is parallel to the arrangement direction of the corresponding multiple coal cutting teeth 4. The end of the upper body 1 of the drill bit is a frustum-shaped surface, and a central airflow channel 11 connecting to the air source is opened along the axial direction of the center of the frustum-shaped surface. A peripheral ventilation groove 12 connecting to the air source is opened on the conical circumference of the frustum-shaped surface corresponding to the position of each support plate. The support plate 2 is provided with a support plate airflow channel 13 that connects to the peripheral ventilation groove 12, and the end of the support plate airflow channel 13 is connected to the peripheral jet holes 6.

[0033] See Figure 1-6 As shown, the peripheral jet hole 6 is a peripheral nozzle 61, which is disposed next to the corresponding cutting tooth base 3.

[0034] See Figure 1-2 As shown, there are three to five support plates 2, with four shown in the example. Each support plate 2 has a cutting tooth base 3. The cutting tooth base 3 has two to six coal cutting teeth 4 arranged in a row, with three shown in the example.

[0035] In practice, the drill bit upper body 1, support plate 2, cutting tooth base 3, coal cutting tooth 4, and peripheral nozzle 5 are connected by welding.

[0036] During use, the high-pressure gas is divided into two streams. One stream enters from the central airflow channel 11 of the drill bit body 1, passes through the peripheral ventilation groove 12 and the airflow channel 13 of the support plate, and finally is ejected from the peripheral nozzle 61 to reach the bottom of the well. The other stream enters from the central airflow channel 11 of the drill bit body 1 and is ejected directly from the central jet hole 5 to reach the bottom of the well.

[0037] Compared with the traditional structure, the jet nozzle in this embodiment is closer to the bottom of the well. The high-pressure airflow quickly reaches the bottom of the well after leaving the jet nozzle, maintaining a relatively high flow velocity. This greatly increases the airflow's ability to clean the slag at the bottom of the well. In addition, the gas jet direction has a certain angle with the bottom of the well, which reduces the interference between the upper and lower airflows compared to vertical jetting. This improves the airflow's ability to clean slag at the bottom of the well and the ability to return slag to the top, thereby increasing the service life of the cat claw drill bit.

[0038] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A novel cat claw drill bit with a jetting structure, comprising a drill bit upper body (1), multiple support plates (2) fixedly mounted on the drill bit upper body (1), a cutting tooth base (3) fixed to the end of the support plate (2), and multiple coal cutting teeth (4) fixed on the cutting tooth base (3); wherein the orientation of the coal cutting teeth (4) has a certain angle with the feed direction of the drill bit; characterized in that: The central part of the cutting tooth base (3) is provided with a central jet hole (5), and a peripheral jet hole (6) is provided on or beside the cutting tooth base (3), so that the peripheral jet hole (6) is located on the side of the coal cutting tooth (4), and the orientation of the peripheral jet hole (6) is consistent with the orientation of the corresponding coal cutting tooth (4).

2. The cat claw drill bit with the novel jetting structure according to claim 1, characterized in that: The central jet hole (5) and the peripheral jet hole (6) extend axially beyond the end face of the support plate (2) and are closer to the end of the drill bit.

3. The cat claw drill bit with the novel jetting structure according to claim 2, characterized in that: The peripheral jet hole (6) is a long, flat hole, and the length direction of the long, flat hole is parallel to the arrangement direction of the corresponding multiple coal cutting teeth (4).

4. The cat claw drill bit with the novel jetting structure according to claim 3, characterized in that: The end of the drill bit upper body (1) is a frustum, and a central airflow channel (11) connecting the air source is opened along the center of the frustum along its axial direction. A peripheral ventilation groove (12) connecting the air source is opened on the conical circumference of the frustum corresponding to the position of each of the support plates. The support plate (2) is provided with a support plate airflow channel (13) that connects with the peripheral ventilation groove (12). The end of the support plate airflow channel (13) is connected to the peripheral jet hole (6).

5. The cat claw drill bit with the novel jetting structure according to claim 4, characterized in that: The peripheral jet hole (6) is a peripheral nozzle (61), which is located next to the corresponding cutting tooth base (3).

6. The cat claw drill bit with the novel jetting structure according to claim 1, characterized in that: There are three to five support plates (2), and each support plate (2) is provided with a cutting tooth base (3).

7. The cat claw drill bit with the novel jetting structure according to claim 6, characterized in that: The cutting tooth base (3) is provided with two to six coal cutting teeth (4) arranged in a row.

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