A rock bit

Abstract

The utility model belongs to the technical field of roller cone drill bit, specifically provide a kind of mining roller cone drill bit including drill bit main body and three jaws, each jaw is rotatably provided with roller, respectively, and the two jaws between drill bit main body are equipped with shunt, the other end of drill bit main body is equipped with the main stream passage being connected with outside, one end of shunt is all communicated with main stream passage, the one end of each shunt near jaw is respectively clamped with nozzle, the inside of nozzle is sequentially equipped with inflow section, pressurization section and jet section from input end to output end. The utility model is through the nozzle inside by setting the inflow section, pressurization section and jet section of gradually decreasing internal diameter, enhanced the cleaning effect of drilling fluid to well bottom rock debris, reduce the repeated crushing caused by rock debris accumulation, to improve drilling efficiency, while nozzle and drill bit main body adopt clamping mode, compared with welding mode, disassembly and assembly are convenient and fast, greatly shorten disassembly time, reduce downtime, to reduce exploitation cost.

Description

Technical Field

[0001] This application belongs to the field of roller cone drill bit technology, and more specifically, relates to a mining roller cone drill bit. Background Technology

[0002] Mining roller cone drill bits are a type of drilling tool widely used in mining, geological exploration, oil and gas drilling, and other fields. They are mainly used for drilling oil wells in hard strata such as rocks and ores. During drilling operations, the drill pipe rotates with the drill bit (triode drill bit). At this time, the roller cones rotate on their own, and under the action of impact load, the roller cones achieve the cutting function. At the same time, the drilling fluid flowing out of the nozzle cleans the rock cuttings at the bottom of the well and cools the drill bit.

[0003] However, existing water nozzles mostly use straight cylindrical or simple conical structures with low spray speeds, resulting in poor cleaning of rock cuttings at the bottom of the well. Especially in deep wells or hard rock formations, rock cuttings accumulation can easily cause repeated breakage, increasing drill bit wear and energy consumption, and affecting drilling continuity. In addition, the water nozzles installed on existing roller cone drill bits are generally fixed to the drill bit body by welding, which takes a long time to disassemble and assemble, thus extending downtime and indirectly increasing mining costs. Utility Model Content

[0004] Based on the above-mentioned technical problems, this application provides a mining roller cone drill bit to solve the technical problems in the prior art, such as the low spray speed of the water nozzle, which leads to poor cleaning effect on rock cuttings at the bottom of the well and the long time required for the disassembly and assembly of the water nozzle.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a mining roller cone drill bit is provided, including a drill bit body, three teeth fixed at one end of the drill bit body, and the three teeth are evenly arranged along the circumference of the drill bit body. Each tooth is rotatably provided with a roller cone. A flow channel is provided between two adjacent teeth on the drill bit body. A main flow channel connected to the outside is provided at the other end of the drill bit body. One end of each flow channel is connected to the main flow channel. A nozzle is respectively engaged at the end of each flow channel near the tooth. The end of the nozzle near the main flow channel is the input end, and the other end of the nozzle is the output end. The nozzle has an inflow section, a pressurization section, and an injection section arranged sequentially from the input end to the output end. The inner diameter of the inflow section, the pressurization section, and the injection section decreases sequentially.

[0006] Furthermore, each of the flow channels has an annular groove at one end near the tooth claw. The end of the annular groove near the main flow channel forms a first step with the flow channel, and the other end of the annular groove forms a second step with the flow channel. The inner diameter of the first step is smaller than the outer diameter of the nozzle input end, and the inner diameter of the second step is equal to the outer diameter of the nozzle input end. The nozzle is snapped into the annular groove by a snap-fit ​​component.

[0007] Furthermore, the outer diameter of the nozzle's output end is smaller than the outer diameter of its input end, and an installation space is formed between the nozzle and the inner wall of the flow channel. The snap-fit ​​component is a retaining ring. After passing through the installation space, the retaining ring snaps between the nozzle and the second step. The two ends of the retaining ring abut against the nozzle and the second step, respectively.

[0008] Furthermore, a first tapering section is provided between the inflow section and the pressurization section, and a second tapering section is provided between the pressurization section and the injection section.

[0009] Furthermore, the inner diameter of the pressurization section is one-sixth of the inner diameter of the inflow section, and the inner diameter of the injection section is one-quarter of the inner diameter of the inflow section.

[0010] Furthermore, a sealing element is fixed between the sidewalls of the annular groove.

[0011] Furthermore, the sealing element is a sealing ring, and the two sides of the sealing ring abut against the annular groove and the nozzle, respectively.

[0012] Furthermore, there are multiple seals, and the multiple seals are arranged at axial intervals along the annular groove.

[0013] Compared with the prior art, the beneficial effects of the mining roller cone drill bit provided in this application are: 1. The nozzle is designed with an inflow section, a pressurization section, and an injection section with progressively decreasing inner diameters, as well as a first tapering section and a second tapering section. This increases the speed at which the drilling fluid is ejected from the nozzle, enhances the cleaning effect of the drilling fluid on the rock cuttings at the bottom of the well, reduces repeated breaking caused by rock cuttings accumulation, ensures drilling continuity, and thus improves drilling efficiency. At the same time, the nozzle and the drill bit body are connected by a snap-fit ​​method, which is more convenient and faster to disassemble and assemble than the welding method, greatly shortens the disassembly and assembly time, reduces downtime, and thus reduces mining costs. 2. Multiple sealing rings are installed between the side walls of the annular groove to form multiple sealing lines to prevent drilling fluid from leaking from the connection between the nozzle and the distribution channel, ensuring that all drilling fluid is sprayed to the bottom of the well through the nozzle, improving the efficiency of drilling fluid use, and at the same time improving the reliability and stability of the drill bit operation. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a perspective view of a mining roller cone drill bit according to the present invention; Figure 2 This is a top view of a mining roller cone drill bit according to the present invention; Figure 3 for Figure 2 AA view; Figure 4 for Figure 3 Enlarged view of part B.

[0016] Explanation of reference numerals in the attached figures: 1. Drill bit body; 11. Flow channel; 111. Annular groove; 1111. First step; 1112. Second step; 113. Installation space; 12. Main flow channel; 2. Tooth claw; 3. Tooth cone; 4. Nozzle; 41. Input end; 42. Output end; 43. Inflow section; 44. Pressurization section; 45. Injection section; 46. First tapering section; 47. Second tapering section; 5. Snap ring; 6. Seal. Detailed Implementation

[0017] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0018] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0019] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0022] Please refer to the following: Figures 1 to 4 As shown, the following describes a mining rotary drill bit 3 provided by an embodiment of this application. The mining rotary drill bit 3 of this utility model includes a drill bit body 1, three jaws 2, and three rotary cones 3. The drill bit body 1 is used to connect with a drill rod (not shown in the figure) of the prior art. The three jaws 2 are fixed at one end of the drill bit body 1 and are evenly arranged along the circumference of the drill bit body 1. The three rotary cones 3 are rotatably mounted on the three jaws 2, that is, each jaw 2 is rotatably mounted with a rotary cone 3. During drilling operations, the drill rod drives the drill bit body 1 to rotate, which in turn drives the three jaws 2 and the rotary cones 3 mounted on them to rotate. During contact with hard strata such as rocks and ores, the rotary cones 3 rotate due to the friction and pushing force from the rotation of the drill bit body 1, and also cut and break the strata under the action of impact loads, thus achieving the drilling function.

[0023] The drill bit body 1 has a branch channel 11 located between two adjacent jaws 2. The other end of the drill bit body 1 has a main channel 12 connected to the outside. One end of each branch channel 11 is connected to the main channel 12. During drilling, drilling fluid enters the main channel 12 from the drill pipe and then flows out through the branch channels 11 located between two adjacent jaws 2. A nozzle 4 is attached to one end of each branch channel 11 near the jaw 2 to spray drilling fluid towards the bottom of the well, removing rock cuttings generated by the drill bit and cooling the roller cones 3 to prevent damage from overheating, ensuring smooth drilling operations. The nozzle 4 is also attached to the drill bit body 1 for easy installation and disassembly.

[0024] In this embodiment, each branch channel 11 has an annular groove 111 at one end near the tooth 2. A first step 1111 is formed between the end of the annular groove 111 near the main channel 12 and the branch channel 11. A second step 1112 is formed between the other end of the annular groove 111 and the branch channel 11. The inner diameter of the first step 1111 is smaller than the outer diameter of the input end 41 of the nozzle 4, and the inner diameter of the second step 1112 is equal to the outer diameter of the input end 41 of the nozzle 4. The nozzle 4 is snapped into the annular groove 111 by a snap-fit ​​device. In practice, the input end 41 of the nozzle 4 is inserted into the annular groove 111, with the input end 41 facing the main channel 12 and the output end 42 facing the tooth 2. Since the inner diameter of the second step 1112 is equal to the outer diameter of the input end 41 of the nozzle 4, the nozzle 4 can slide into the annular groove 111 until the input end 41 of the nozzle 4 abuts against the first step 1111. Then, the nozzle 4 is snapped into the annular groove 111 by the snap-fit ​​device.

[0025] Preferably, the outer diameter of the output end 42 of the nozzle 4 is smaller than the outer diameter of the input end 41, forming an installation space 113 between it and the inner wall of the diversion channel 11. The snap-fit ​​component is a retaining ring 5, which passes through the installation space 113 and snaps into place between the nozzle 4 and the second step 1112. After installation, both ends of the retaining ring 5 abut against the nozzle 4 and the second step 1112, respectively. It should be noted that the retaining ring 5 is existing technology, with a shape similar to a C-shaped structure with one side open. When installation is required, external tools can be used to move the opening of the retaining ring 5 towards each other, deforming it to facilitate moving the retaining ring 5 into the working space. When the retaining ring 5 moves between the nozzle 4 and the second step 1112, the retaining ring 5 is released, allowing it to return to its original position through its own elasticity. In this way, the nozzle 4 and the diversion channel 11 are snap-fitted and fixed. This snap-fit ​​method is convenient and quick to install and remove, greatly shortening the installation and removal time compared to welding, reducing downtime, and lowering mining costs.

[0026] Preferably, a sealing element 6 is fixed between the sidewalls of the annular groove 111. This prevents drilling fluid from leaking from the connection between the nozzle 4 and the diversion channel 11, ensuring that all drilling fluid is sprayed to the bottom of the well through the nozzle 4, thereby improving the efficiency of drilling fluid use. Preferably, the sealing element 6 is a sealing rubber ring, with both sides of the sealing rubber ring abutting against the annular groove 111 and the nozzle 4, respectively. Preferably, there are multiple sealing elements 6, which are arranged at intervals along the axial direction of the annular groove 111. By forming multiple sealing lines through multiple sealing elements 6, the sealing requirements under different pressures and operating conditions can be met to a certain extent, ensuring that the drilling fluid does not leak and improving the reliability and stability of the drill bit operation.

[0027] In this embodiment, the end of the nozzle 4 closest to the main channel 12 is the input end 41, and the other end of the nozzle 4 is the output end 42. The nozzle 4 has an inflow section 43, a pressurizing section 44, and a jetting section 45 sequentially arranged from the input end 41 to the output end 42. The inner diameters of the inflow section 43, pressurizing section 44, and jetting section 45 decrease sequentially. By setting the inflow section 43, pressurizing section 44, and jetting section 45 with sequentially decreasing inner diameters inside the nozzle 4, the flow velocity increases as the fluid flows in a gradually narrowing channel, thus increasing the speed at which the drilling fluid is ejected from the nozzle 4. Simultaneously, by progressively reducing the diameter, pressure and velocity distribution can be more precisely controlled. Furthermore, each stage of the narrowing section independently accelerates the fluid, resulting in a more significant overall acceleration effect. This enhances the drilling fluid's ability to clean cuttings from the bottom of the well, reduces repeated breaking caused by cuttings accumulation, lowers drill bit wear and energy consumption, and ensures drilling continuity.

[0028] Preferably, a first tapering section 46 is provided between the inflow section 43 and the pressurization section 44, and a second tapering section 47 is provided between the pressurization section 44 and the injection section 45. The first tapering section 46 and the second tapering section 47 allow for a smoother transition of the fluid as it passes through the nozzle 4, reducing fluid flow resistance loss and further increasing the fluid velocity in the pressurization section 44 and the injection section 45, thus enhancing the injection effect.

[0029] In this embodiment, the inner diameter of the pressurization section 44 is one-sixth of the inner diameter of the inflow section 43, and the inner diameter of the jet section 45 is one-quarter of the inner diameter of the inflow section 43. This allows for better control of fluid velocity changes, resulting in a more ideal acceleration effect as the fluid passes through the pressurization section 44 and the jet section 45, achieving the optimal purpose of jet cleaning of rock debris.

[0030] In a specific implementation of this utility model, during drilling operations, the drill pipe drives the drill bit body 1, the jaws 2, and the roller cone 3 to rotate. At the same time, the drilling fluid enters the main channel 12 of the drill bit body 1 through the drill pipe, and then flows into each branch channel 11. The drilling fluid then passes through the inflow section 43, the first converging section 46, the pressurizing section 44, the second converging section 47, and the jetting section 45 of the nozzle 4 in sequence. The flow velocity increases in the gradually narrowing channel, and finally it is jetted to the bottom of the well at a high speed to clean up the rock cuttings generated by the drill bit at the bottom of the well, while cooling the roller cone 3.

[0031] It is understood that the parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be repeated here. After this description, it can be considered that the present utility model specification has recorded each combined embodiment and can support different combined embodiments.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mining roller cone drill bit, comprising a drill bit body, three teeth fixedly disposed at one end of the drill bit body, the three teeth being evenly arranged along the circumference of the drill bit body, and each tooth being rotatably mounted with a roller cone, characterized in that, The drill bit body has a flow channel between two adjacent jaws, and the other end of the drill bit body has a main flow channel that communicates with the outside. One end of each flow channel is connected to the main flow channel. A nozzle is snapped into the end of each flow channel near the jaw. The end of the nozzle near the main flow channel is the input end, and the other end of the nozzle is the output end. The nozzle has an inflow section, a pressurization section, and an injection section arranged sequentially from the input end to the output end. The inner diameter of the inflow section, the pressurization section, and the injection section decreases sequentially.

2. The mining roller cone drill bit according to claim 1, characterized in that, Each of the flow channels has an annular groove at one end near the tooth claw. The end of the annular groove near the main flow channel forms a first step with the flow channel, and the other end of the annular groove forms a second step with the flow channel. The inner diameter of the first step is smaller than the outer diameter of the nozzle input end, and the inner diameter of the second step is equal to the outer diameter of the nozzle input end. The nozzle is snapped into the annular groove by a snap-fit ​​component.

3. The mining roller cone drill bit according to claim 2, characterized in that, The outer diameter of the nozzle's output end is smaller than the outer diameter of its input end, and an installation space is formed between the nozzle and the inner wall of the flow channel. The snap-fit ​​component is a retaining ring. After passing through the installation space, the retaining ring snaps between the nozzle and the second step. The two ends of the retaining ring abut against the nozzle and the second step, respectively.

4. The mining roller cone drill bit according to claim 1, characterized in that, A first tapering section is provided between the inflow section and the pressurization section, and a second tapering section is provided between the pressurization section and the injection section.

5. The mining roller cone drill bit according to claim 1 or 4, characterized in that, The inner diameter of the pressurization section is one-sixth of the inner diameter of the inflow section, and the inner diameter of the injection section is one-quarter of the inner diameter of the inflow section.

6. The mining roller cone drill bit according to claim 2, characterized in that, A sealing element is fixed between the sidewalls of the annular groove.

7. The mining roller cone drill bit according to claim 6, characterized in that, The sealing element is a sealing ring, and the two sides of the sealing ring abut against the annular groove and the nozzle, respectively.

8. The mining roller cone drill bit according to claim 7, characterized in that, There are multiple sealing elements, and the multiple sealing elements are arranged at axial intervals along the annular groove.

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