Durable claw bit

Abstract

The utility model provides a durable claw drill bit belongs to rock drilling tool technical field. The durable claw drill bit includes: drill bit body, the drill bit body is opened tooth hole, nozzle hole, first gas channel and second gas channel, tooth hole and first gas channel intercommunication, the nozzle hole is fixed with nozzle, and nozzle and second gas channel intercommunication, cutting part is arranged in tooth hole, cutting part is equipped with support and cutting part, and cutting part protrudes in the top of support, and the lower part of support rotatably sets up on the drill bit body through annular clamping piece, and the upper portion surface of support is opened spiral groove, and spiral groove is equipped with wear -resisting alloy layer, and wear -resisting alloy layer protrudes from the surface of support, the utility model can make the cutting part that installs on the drill bit body passive rotation, realizes the uniform wear and tear of drill bit cutting part in the well drilling process, and through the additional cooling gas path realizes the accurate cooling of cutting part, avoids cutting part and is damaged, failure because of high temperature and wear and tear, thereby prolongs the service life of claw drill bit.

Description

Technical Field

[0001] This invention relates to a durable claw-shaped drill bit, belonging to the field of rock drilling tool technology. Background Technology

[0002] The claw-shaped drill bit (Chinese patent application number CN20242107936.1) is specifically designed for complex geological conditions such as soft rock, gravel layers, clay, and loose surfaces. It features a unique rock-breaking structure and smooth slag removal space, making it suitable for oil and gas drilling, geothermal exploration, and construction of building pile foundations and slope protection. Theoretically, this claw-shaped drill bit should be able to achieve efficient rock breaking while also having a relatively ideal service life. However, its actual working efficiency and service life are both lower than expected. Actual verification revealed the following two main problems: First, the rotatable cutting teeth still exhibit unilateral wear, failing to achieve the designed uniform wear; second, during drilling, the rotation of the cutting teeth in the tooth hole generates a large amount of heat, leading to accelerated wear of the locating pin and ultimately causing the cutting teeth to fall off. Summary of the Invention

[0003] To address the aforementioned shortcomings of existing technologies, this invention proposes a novel durable claw-shaped drill bit that enables the cutting components mounted on the drill bit body to rotate passively, achieving uniform wear of the cutting components during drilling. Furthermore, by adding a cooling air path, precise cooling of the cutting components is achieved, preventing damage and failure of the cutting components due to high temperatures and wear, thereby extending the service life of the claw-shaped drill bit.

[0004] This invention relates to a durable claw-shaped drill bit, comprising:

[0005] The drill bit body has a tooth hole, a nozzle hole, a first air passage and a second air passage. The tooth hole is connected to the first air passage, and a nozzle is fixed in the nozzle hole. The nozzle is connected to the second air passage.

[0006] A cutting component is disposed in a tooth hole; the cutting component has a support part and a cutting part, the cutting part protrudes from the top of the support part, the lower part of the support part is rotatably disposed on the drill bit body by a circumferential clamping member, the upper surface of the support part is provided with a spiral groove, the spiral groove is provided with a wear-resistant alloy layer, and the wear-resistant alloy layer protrudes from the surface of the support part.

[0007] Technical effect

[0008] On the one hand, the cutting component in this invention has a spiral groove on its surface, and a wear-resistant alloy layer protruding from the surface of the support is provided in the spiral groove; during drilling operations in soft formations, the protruding spiral wear-resistant alloy layer interacts with the formation rock, forcing the cutting component to passively rotate in the mounting hole, breaking the traditional fixed tooth cutting mode, ensuring that the circumferential surface of the cutting component can participate in cutting, solving the problem of uneven wear of the cutting component, maintaining the sharpness of the cutting component, and greatly extending the service life of the drill bit;

[0009] On the other hand, the present invention adds a first air passage for cooling the cutting components. The compressed air (carried by the drill pipe) flowing into the first air passage can effectively remove the large amount of heat generated by the cutting components during cutting and rotational friction, avoiding thermal cracking of the cutting components and the falling off of the cutting components due to wear failure of the circumferential clamping parts, thus further ensuring the service life and working efficiency of the drill bit. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0011] Figure 2 This is a schematic cross-sectional view of the first airway in an embodiment of the present invention;

[0012] Figure 3 This is a schematic diagram of the cutting component in an embodiment of the present invention;

[0013] Figure 4 This is a schematic cross-sectional view of the first airway in an embodiment of the present invention;

[0014] Reference numerals: 100, drill bit body; 101, first air passage; 102, second air passage; 103, nozzle; 200, cutting component; 201, support part; 202, spiral groove; 203, annular groove; 204, cutting part; 400, circumferential clamping part; 500, plug. Detailed Implementation

[0015] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0016] It should be noted that, in specific embodiments, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly defined, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0017] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, embodiments of the present invention relate to durable claw-shaped drill bits, including:

[0018] The drill bit body 100 has a toothed hole, a nozzle hole, a first air passage 101, and a second air passage 102. The toothed hole is connected to the first air passage 101. A nozzle 103 is fixed in the nozzle hole and is connected to the second air passage 102. The first air passage 101 and the second air passage 102 are respectively connected to the air passages on the drill rod body through the drill bit body 100 for introducing compressed air.

[0019] A cutting component 200 is disposed in a tooth hole; the cutting component 200 is provided with a support portion 201 and a cutting portion 204, the cutting portion 204 protrudes from the top of the support portion 201, the lower part of the support portion 201 is rotatably disposed in the tooth hole by a circumferential clamping member 400, the upper part of the support portion 201 is frustoconical in shape and has a spiral groove 202 on its surface, the spiral groove 202 is provided with a wear-resistant alloy layer, the wear-resistant alloy layer protrudes from the circumferential surface of the support portion 201.

[0020] In some preferred embodiments, the support portion 201 and the cutting portion 204 are integral structural components made of alloy material.

[0021] In some preferred embodiments, the support part 201 and the cutting part 204 are separate structural components, and the cutting part 204 is an alloy tooth fixed in the support part 201; in the separate structural component, the cutting part 204 can protrude more, and the length of the protrusion from the support part 201 can be two to three times that of the integral structure, making it less likely to form "mud bags" when cutting soft rock.

[0022] For some preferred embodiments, the circumferential clamping member can adopt the original limiting pin structure in CN20242107936.1.

[0023] In some preferred embodiments, the circumferential clamping member 400 is a metal ball, such as a steel ball; the number of metal balls in one tooth hole is not less than 2, preferably 3 to 10; more preferably 5 to 10; and even more preferably 9 or 10. Corresponding to the circumferential clamping member 400, the support part 201 and the drill bit body 100 are provided with annular grooves 203. Through circumferential clamping, the support part 201 not only has the ability to passively rotate, but also provides space for cooling the support part 201. Using metal balls instead of limiting pins has the following advantages: limiting pins are fixed and can be set in a small number, resulting in a faster wear rate, while using steel balls for limiting is rolling and can be set in a large number, resulting in a slower wear rate and further improving the service life of the drill bit.

[0024] In some preferred embodiments, the first air passage 101 extends through the drill bit body 100 to reduce assembly difficulty when using a metal ball as the circumferential clamping member 400; after the circumferential clamping member 400 is assembled, the first air passage 101 is sealed on the outer surface of the drill bit body 100 by a plug 500. More preferably, the plug 500 is followed by filler welding for further sealing.

[0025] In some preferred embodiments, the spiral groove 202 is provided on the surface of the support portion 201 in three ways, and the three spiral grooves 202 are evenly distributed around the surface of the support portion 201.

[0026] It should be emphasized that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A durable claw-shaped drill bit, characterized in that: include: The drill bit body has a tooth hole, a nozzle hole, a first air passage and a second air passage. The tooth hole is connected to the first air passage, and a nozzle is fixed in the nozzle hole. The nozzle is connected to the second air passage. A cutting component; the cutting component is provided with a support part and a cutting part, the cutting part protruding from the top of the support part, the lower part of the support part being rotatably mounted on the drill bit body by means of a circumferential clamping member, the upper surface of the support part being provided with a spiral groove, the spiral groove being provided with a wear-resistant alloy layer, the wear-resistant alloy layer protruding from the surface of the support part.

2. The durable claw-shaped drill bit according to claim 1, characterized in that: The support and cutting parts are an integral structural component.

3. The durable claw-shaped drill bit according to claim 1, characterized in that: The support and cutting parts are separate structural components.

4. The durable claw-shaped drill bit according to claim 1, characterized in that: The circumferential clamping element is a metal ball, with no less than 2 balls in a toothed hole; preferably, the number is 3 to 10; more preferably, the number is 5 to 10; and even more preferably, the number is 9 or 10. Corresponding to the circumferential clamping member, the support part and the drill bit body are provided with annular grooves.

5. The durable claw-shaped drill bit according to claim 4, characterized in that: The circumferential clamping element is a steel ball.

6. The durable claw drill bit according to claim 1, characterized in that: The circumferential clamping element is a limiting pin, and there are two of them in one toothed hole.

7. The durable claw drill bit according to claim 1, 2, 3 or 4, characterized in that: The first air passage penetrates the drill bit body.

8. The durable claw drill bit according to claim 7, characterized in that: The first air passage is sealed on the outer surface of the drill bit body by a plug.

9. The durable claw drill bit according to claim 8, characterized in that: The first air passage is sealed with a plug and then filled with welded sealant.

10. The durable claw drill bit according to claim 1, characterized in that: The spiral groove is provided on the surface of the support part in three ways, and the three spiral grooves are evenly distributed around the surface of the support part in a circumferential manner.

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