Drill bit and down-the-hole drill

Abstract

The utility model discloses a drill bit and a down-the-hole drill. The drill bit comprises a drill bit body and an exhaust channel arranged in the drill bit body. Wherein the drill bit body comprises a mounting part and an impact part, the impact part is connected with the front end of the mounting part, the impact part is provided with a slag blowing channel, the slag blowing channel comprises a first slag blowing groove and a second slag blowing groove, the second slag blowing groove is formed in the peripheral surface of the impact part, and the first slag blowing groove is communicated with the second slag blowing groove. A slag outlet of the second slag blowing groove extends to the rear end face of the impact part, the first slag blowing groove is formed in the front end face of the impact part, and the two ends of the first slag blowing groove communicate with the slag blowing channel and the second slag blowing groove correspondingly. Compared with the prior art, the drill bit and the down-the-hole drilling tool have the advantages that the drill bit is not prone to axial breakage, the drilling stability is high, and the drilling cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of drilling, and more specifically, to a drill bit and a down-the-hole drilling tool. Background Art

[0002] The drill bit is a common rock drilling tool. As the component that executes the rock breaking action, the drill bit directly contacts the rock formation during operation, transmitting the rotational torque and impact force provided by the drill tool to the rock formation to achieve rock breaking and hole formation.

[0003] The drill bit is connected to the drill sleeve via a spline. A down-the-hole hammer drives the drill bit's axial rotation, providing an axial pulse force. During the rock-breaking process, the alloy teeth on the drill bit's working face impact and cut the rock. However, current drill bits are prone to axial fracture during operation, which affects drilling efficiency and increases drilling costs.

[0004] Therefore, there is an urgent need for a drill bit and a down-the-hole drilling tool, which are not prone to axial breakage, have high drilling stability, and reduce drilling costs. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a drill bit and a down-the-hole drilling tool, wherein the drill bit is not prone to axial breakage, has high drilling stability, and reduces drilling costs.

[0006] The technical solutions provided in this application are as follows:

[0007] A drill bit comprises a drill bit body and an exhaust passage arranged in the drill bit body;

[0008] in,

[0009] The drill bit body includes a mounting portion and an impact portion, the impact portion is connected to the front end of the mounting portion, the impact portion is provided with a slag blowing channel, the slag blowing channel includes a first slag blowing groove and a second slag blowing groove, the second slag blowing groove is provided on the outer peripheral surface of the impact portion, and the slag outlet of the second slag blowing groove extends to the rear end face of the impact portion, the first slag blowing groove is provided on the front end face of the impact portion, and the two ends of the first slag blowing groove are respectively connected to the slag blowing channel and the second slag blowing groove.

[0010] Preferably, at least two slag blowing channels are provided, and the slag blowing channels are arranged at intervals in the circumferential direction around the axis of the impact portion.

[0011] Preferably, the mounting portion comprises a connecting section, a transmission section and a positioning section which are sequentially connected to the rear end of the impact portion;

[0012] The transmission section is used for transmission connection with the clamping sleeve. The clamping sleeve is sleeved on the outside of the mounting portion. The front end surface of the clamping sleeve abuts against the rear end surface of the impact portion.

[0013] Preferably, splines are provided at intervals on the outer circumference of the transmission section, and the transmission section and the clamp sleeve are connected via spline transmission.

[0014] Preferably, the maximum outer diameter of the connecting section is equal to the maximum outer diameter of the transmission section;

[0015] The outer diameter of the positioning section is smaller than the outer diameter of the transmission section, and a positioning block is provided at one end of the positioning section away from the transmission section.

[0016] Preferably, the ratio of the outer diameter of the connecting section to the length of the mounting portion is 0.6 to 0.8.

[0017] Preferably, a ratio of a length from a front end surface of the transmission section to a front end surface of the impact portion to an outer diameter of the connecting section is 1.1 to 1.3.

[0018] A down-the-hole drilling tool comprises the drill bit described in any one of the above items.

[0019] The drill bit provided by the utility model is provided with a drill bit body and an exhaust channel. The exhaust channel is provided within the drill bit body and is used to discharge high-pressure gas. The drill bit body includes a mounting portion and an impact portion. The impact portion is connected to the front end of the mounting portion. The mounting portion is provided with a slag blowing channel. High-pressure gas is discharged through the exhaust channel, blowing up the rock debris at the bottom of the hole and discharging it through the slag blowing channel. The slag blowing channel includes a first slag blowing groove and a second slag blowing groove. The second slag blowing groove is provided on the outer circumferential surface of the impact portion. The slag outlet of the second slag blowing groove extends to the rear end face of the impact portion. The first slag blowing groove is provided on the front end face of the impact portion, and the two ends of the first slag blowing groove are respectively connected to the slag blowing channel and the second slag blowing groove. In the prior art, a transition shoulder is provided between the impact portion and the mounting portion of the drill bit. During the transmission process of the drill bit, the driving torque at the transmission connection between the front end face of the impact portion and the impactor is large, which makes the drill bit prone to breakage at the transmission connection. However, the drill bit in the present application is not provided with a transition shoulder. On the one hand, the material used for the drill bit is reduced. On the other hand, the driving force arm at the transmission connection between the front end face of the impact portion and the impactor is shortened, the torque on the mounting portion of the drill bit is reduced, the drill bit is less likely to break axially, and has higher stability. It can be seen that compared with the prior art, the drill bit in the embodiment of the present invention is less likely to break axially, has high drilling stability, and reduces drilling costs.

[0020] The embodiment of the present invention also provides a down-the-hole drilling tool, including the above-mentioned drill bit, which can also achieve the technical effects of the drill bit being less likely to break axially, having high drilling stability, and reducing drilling costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 A structural schematic diagram of a drill bit provided in the prior art;

[0023] Figure 2 A structural schematic diagram of a drill bit provided in an embodiment of the utility model;

[0024] Figure 3 A schematic structural diagram of a down-the-hole drilling tool provided in an embodiment of the utility model.

[0025] Reference numerals:

[0026] Existing technology: 01, first mounting portion, 02, first impact portion; 03, transition shoulder;

[0027] This application: 1. Exhaust channel; 2. Mounting part; 3. Impact part; 4. First slag blowing groove; 5. Second slag blowing groove; 21. Connecting section; 22. Transmission section; 23. Positioning section; 24. Positioning block; 6. Clamp sleeve; 7. Snap ring; 8. Piston; 9. Outer sleeve. DETAILED DESCRIPTION

[0028] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0029] It should be noted that when an element is referred to as being “fixed on” or “set on” another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" or "several" means two or more, unless otherwise specifically defined.

[0032] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0033] The embodiments of the present invention are written in a progressive manner.

[0034] like Figure 2 and Figure 3 As shown, an embodiment of the utility model provides a drill bit, comprising a drill bit body and an exhaust channel 1 arranged in the drill bit body; wherein the drill bit body comprises a mounting portion 2 and an impact portion 3, the impact portion 3 is connected to the front end of the mounting portion 2, and a slag blowing channel is provided on the mounting portion 2, the slag blowing channel comprises a first slag blowing groove 4 and a second slag blowing groove 5, the second slag blowing groove 5 is arranged on the outer peripheral surface of the impact portion 3, and the slag outlet of the second slag blowing groove 5 extends to the rear end face of the impact portion 3, the first slag blowing groove 4 is arranged on the front end face of the impact portion 3, and the two ends of the first slag blowing groove 4 are respectively connected to the slag blowing channel and the second slag blowing groove 5.

[0035] Drill bits in the prior art are Figure 1As shown, a transition shoulder 03 is provided between the first mounting portion 01 and the first impact portion 02 in the prior art, and the first mounting portion 01 is connected to the drill sleeve via a spline transmission. The first impact portion 02 acts on the rock formation at the bottom of the hole for drilling. However, due to the provision of the transition shoulder 03, a large torque is generated between the connection between the first mounting portion 01 and the drill sleeve and the front end face of the first impact portion 02, resulting in a large torque on the connection, and the drill bit is prone to breakage during operation.

[0036] The drill bit provided by the present invention is provided with a drill bit body and an exhaust channel 1. The exhaust channel 1 is provided in the drill bit body and is used to discharge high-pressure gas. The drill bit body includes a mounting portion 2 and an impact portion 3. The impact portion 3 is connected to the front end of the mounting portion 2. A slag blowing channel is provided on the mounting portion 2. High-pressure gas is discharged through the exhaust channel 1, blowing up the rock debris at the bottom of the hole and discharging it through the slag blowing channel. The slag blowing channel includes a first slag blowing groove 4 and a second slag blowing groove 5. The second slag blowing groove 5 is provided on the outer circumferential surface of the impact portion 3. The slag outlet of the second slag blowing groove 5 extends to the rear end face of the impact portion 3. The first slag blowing groove 4 is provided on the front end face of the impact portion 3, and the two ends of the first slag blowing groove 4 are respectively connected to the slag blowing channel and the second slag blowing groove 5. In the prior art, a transition shoulder 03 is provided between the impact portion 3 and the mounting portion 2 of the drill bit. During the transmission process of the drill bit, the driving torque at the transmission connection between the front end face of the impact portion 3 and the impactor is large, which makes the drill bit prone to breakage at the transmission connection. However, the drill bit in the present application is not provided with a transition shoulder 03. On the one hand, the material used for the drill bit is reduced, and on the other hand, the driving force arm at the transmission connection between the front end face of the impact portion 3 and the impactor is shortened. The torque exerted on the mounting portion 2 of the drill bit is reduced, the drill bit is not prone to axial breakage, and has higher stability. It can be seen that compared with the prior art, the drill bit in the embodiment of the present invention is not prone to axial breakage, has high drilling stability, and reduces drilling costs.

[0037] In the above structure, as one embodiment, at least two slag blowing channels are provided in the embodiment of the present invention, and the slag blowing channels are arranged at intervals in the circumferential direction around the axis of the impact portion 3. Since at least two slag blowing channels are provided, high-pressure gas is discharged from the exhaust channel 1, blowing the rock slag at the bottom of the hole out of the slag blowing channels, thereby improving the slag blowing efficiency and the slag removal effect.

[0038] In the above structure, as one of the implementation modes, the drill bit in the utility model embodiment is further provided with a third slag blowing groove, wherein the third slag blowing groove is arranged on the outer side of the impact part 3, and the third slag blowing groove is arranged between two adjacent second slag blowing grooves 5.

[0039] In the above structure, as one of the implementation modes, the mounting portion 2 in the embodiment of the utility model includes a connecting section 21, a transmission section 22 and a positioning section 23 which are sequentially connected to the rear end of the impact portion 3, wherein the transmission section 22 is used for transmission connection with the clamp sleeve 6, the clamp sleeve 6 is sleeved on the outside of the mounting portion 2, and the front end face of the clamp sleeve 6 is abutted against the rear end face of the impact portion 3.

[0040] More specifically, the transmission section 22 in the embodiment of the present invention is provided with spline grooves at intervals on its outer circumference, and the spline grooves for cooperation are provided on its inner circumference, and the transmission section 22 and the spline sleeve 6 are connected via spline transmission.

[0041] The clamping sleeve in the prior art is installed on the outside of the first mounting portion 01, and the front end face of the clamping sleeve abuts against the rear end face of the transition shoulder 03. The front end face of the clamping sleeve in the embodiment of the utility model directly abuts against the rear end face of the impact portion 3, which has higher transmission efficiency.

[0042] Furthermore, in the embodiment of the present invention, the outlet of the second slag blowing groove 5 is arranged on the outside of the drill sleeve 6 to prevent the drill sleeve 6 from affecting the slag discharge effect.

[0043] Furthermore, in the embodiment of the present invention, the maximum outer diameter of the connecting section 21 is equal to the maximum outer diameter of the transmission section 22, the outer diameter of the positioning section 23 is smaller than the outer diameter of the transmission section 22, and a positioning block 24 is provided at the end of the positioning section 23 away from the transmission section 22. The positioning section 23 is configured to be slidably connected to the retaining ring 7, which is fixed within the outer sleeve 9. When the piston 8 within the impactor provides a pulse force to the drill bit, the piston 8 propels the drill bit to axially reciprocate, and the axial displacement of the drill bit is restrained by the transmission section 22, the positioning block 24, and the retaining ring 7.

[0044] In the above structure, as one embodiment, the ratio between the outer diameter a of the connecting section 21 and the length b of the mounting portion 2 in the embodiment of the present invention is 0.6 to 0.8.

[0045] Furthermore, in the embodiment of the present invention, the ratio of the length c from the front end face of the transmission section 22 to the front end face of the impact portion 3 to the outer diameter a of the connecting section 21 is 1.1 to 1.3.

[0046] Compared with the drill bit in the prior art, the ratio between the outer diameter of the connecting section 21 and the length of the mounting portion 2 in the embodiment of the present invention is reduced. This is because the drill bit in the embodiment of the present invention does not need to be provided with a transition shoulder 03, which not only reduces the raw materials required for the drill bit of the same specification, but also reduces the lever arm and thus reduces the torque at the connection between the connecting section 21 and the drill sleeve 6, and also reduces the torque at the connection between the impact portion 3 and the connecting section 21, so that the drill bit is not prone to axial fracture.

[0047] The utility model also provides a down-the-hole drilling tool, including the above-mentioned drill bit, which can also achieve the technical effects of preventing the drill bit from easily breaking in the axial direction, high drilling stability, and reduced drilling costs.

[0048] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A drill bit, characterized in that: It comprises a drill body and an exhaust passage (1) arranged in the drill body; in, The drill bit body comprises a mounting portion (2) and an impact portion (3), wherein the impact portion (3) is connected to the front end of the mounting portion (2), and a slag blowing channel is provided on the impact portion (3), wherein the slag blowing channel comprises a first slag blowing groove (4) and a second slag blowing groove (5), wherein the second slag blowing groove (5) is provided on the outer peripheral surface of the impact portion (3), and the slag outlet of the second slag blowing groove (5) extends to the rear end surface of the impact portion (3), and the first slag blowing groove (4) is provided on the front end surface of the impact portion (3), and the two ends of the first slag blowing groove (4) are respectively connected to the slag blowing channel and the second slag blowing groove (5).

2. The drill bit according to claim 1, characterized in that At least two slag blowing channels are provided, and the slag blowing channels are arranged at circumferential intervals around the axis of the impact portion (3).

3. The drill bit according to claim 1, characterized in that The mounting portion (2) comprises a connecting section (21), a transmission section (22), and a positioning section (23) which are sequentially connected to the rear end of the impact portion (3); The transmission section (22) is used for transmission connection with the clamping sleeve, the clamping sleeve is sleeved on the outside of the mounting portion (2), and the front end surface of the clamping sleeve abuts against the rear end surface of the impact portion (3).

4. The drill bit according to claim 3, characterized in that Splines (25) are arranged at intervals on the outer circumference of the transmission section (22), and the transmission section (22) and the clamping sleeve are connected via the spline transmission.

5. The drill bit according to claim 4, characterized in that The maximum outer diameter of the connecting section (21) is equal to the maximum outer diameter of the transmission section (22); The outer diameter of the positioning section (23) is smaller than the outer diameter of the transmission section (22), and a positioning stopper (24) is provided at one end of the positioning section (23) away from the transmission section (22).

6. The drill bit according to any one of claims 3 to 5, characterized in that The ratio between the outer diameter of the connecting section (21) and the length of the mounting portion (2) is 0.6 to 0.

8.

7. The drill bit according to any one of claims 3 to 5, characterized in that The ratio of the length from the front end face of the transmission section (22) to the front end face of the impact portion (3) to the outer diameter of the connecting section (21) is 1.1 to 1.

3.

8. A down-the-hole drilling tool, characterized in that: A drill bit comprising the drill bit according to any one of claims 1 to 7.

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