Step drill

Abstract

The utility model discloses a stepped drill bit, contain: steel body, steel body is hollow's columnar body, the body of birth, and the one end of steel body is connected, and the body of birth is hollow's columnar body, the body of birth is configured as the drilling surface to the one end of steel body, and the body of birth is divided into a plurality of sectorial working blocks by main waterway, and each sectorial working block contains a plurality of stepped portions with the coaxial line of steel body and gradually reducing along the outer diameter of drilling direction. The utility model can effectively solve the problem of mudstone sticking drill bit and drill bit eccentricity.

Description

Technical Field

[0001] This utility model relates to the field of geological exploration technology, specifically to a stepped drill bit. Background Technology

[0002] Drilling is an important technical means in geological exploration. A drill bit is used to drill downwards from the surface, creating a cylindrical borehole in the underlying layers to identify and delineate strata. Core samples, mineral samples, and soil samples can be obtained from different depths within the borehole for analysis and research. This data is used to determine the physical and mechanical properties and indicators of rocks and soil layers, providing information for design requirements.

[0003] In geological exploration, mudstones containing a lot of plasticity, such as coal seams, are frequently encountered. These mudstones tend to stick to the drill bit during drilling, and eccentricity can easily occur, causing the drilling direction to deviate. Therefore, there is an urgent need to improve existing drill bit technology to solve the problems of mudstone sticking to the drill bit and drill bit eccentricity. Utility Model Content

[0004] The purpose of this invention is to provide a stepped drill bit that overcomes the aforementioned technical problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a stepped drill bit, characterized in that it comprises: a steel body; the steel body is a hollow columnar body; a matrix body connected to one end of the steel body, the matrix body being a hollow columnar body; the end of the matrix body facing away from the steel body is configured as a drilling face; the matrix body is divided into several sector-shaped working blocks by a main water channel; each sector-shaped working block comprises several stepped portions coaxial with the steel body and whose outer diameter decreases sequentially along the drilling direction.

[0006] In this embodiment, a threaded structure is provided on the inner or outer wall of the steel body at the end opposite to the tire body.

[0007] In this embodiment, the steel body and the matrix are integrally sintered.

[0008] In this embodiment, the outer diameter of the steel body is smaller than the outer diameter of the tire body.

[0009] In some possible implementations, the main waterway includes a plurality of straight water inlets, which are trapezoidal and extend radially from the inner sidewall to the outer sidewall of the tire body.

[0010] In this embodiment, a plurality of the straight water inlets are arranged in a uniform circular array with the central axis of the tire body as the axis.

[0011] In some possible implementations, the main waterway further includes several water passages, which are arranged corresponding to the straight water inlet and between two adjacent fan-shaped working blocks. The water passages are arranged along the outer side wall of the tire body, smoothly transitioning from the bottom end of the straight water inlet to the outer side wall of the steel body.

[0012] In some possible implementations, the stepped drill bit also includes a heat dissipation structure comprising a plurality of heat dissipation holes, each of which is disposed at the waist of the straight nozzle.

[0013] In this embodiment, the heat dissipation holes connect the cavity of the steel body to the main water channel.

[0014] In this embodiment, a plurality of polycrystals are uniformly embedded in the inner and outer walls of each of the fan-shaped working blocks.

[0015] Compared with existing technologies, this utility model of a stepped drill bit has the following advantages: the steel body and the matrix are integrally sintered, which strengthens the overall structure of the drill bit and ensures its effective service life; the stepped section provides better guidance and prevents eccentricity; the main water channel connects the inner and outer walls of the matrix to cool the drill bit, enhancing the cooling effect; the polycrystalline structure, when the matrix wears during drilling, slightly protrudes from the outer wall of the matrix, protecting the matrix and allowing it to contact the drilled object first, thus extending its service life; and the heat dissipation structure improves heat dissipation and ensures the effective service life of the drill bit. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a stepped drill bit according to an embodiment of this application. Detailed Implementation

[0017] Embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different examples, all of which do not depart from the scope of this utility model, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit this utility model.

[0018] It should be understood that although the terms "first," "second," etc., may be used herein to describe various features, these features should not be limited by these terms. The use of these terms is merely for distinction and should not be construed as indicating or implying relative importance. For example, without departing from the scope of the exemplary embodiments, a first feature may be referred to as a second feature, and similarly, a second feature may be referred to as a first feature.

[0019] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, a direct connection, a welding connection, or a connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the accompanying drawings and specific circumstances.

[0020] This application provides a stepped drill bit. Figure 1 This is a schematic diagram of the overall structure of a stepped drill bit according to an embodiment of this application, as shown below. Figure 1 As shown, the stepped drill bit includes: a steel body 100; the steel body 100 is a hollow cylindrical body; a matrix 200 connected to one end of the steel body 100, the matrix 200 being a hollow cylindrical body; the end of the matrix 200 facing away from the steel body 100 is configured as a drilling face; the matrix 200 is divided into several sector-shaped working blocks 201 by the main water channel 300; each sector-shaped working block 201 includes several stepped portions 202 that are coaxial with the steel body 100 and whose outer diameter decreases sequentially along the drilling direction.

[0021] In the above embodiments, preferably, the stepped drill bit is a three-stage drill bit, and the stepped part 202 includes steps 2021, 2022 and 2023.

[0022] In the above embodiment, a threaded structure (not shown in the figure) is provided on the inner or outer wall of the steel body 100 at the end opposite to the matrix 200. The threaded structure facilitates connection with the drilling tool.

[0023] In the above embodiment, the steel body 100 and the matrix 200 are integrally sintered. This method strengthens the overall structure of the drill bit and ensures its effective service life.

[0024] In the above embodiment, the main water channel 300 includes a plurality of straight water inlets 301, which are trapezoidal in shape and extend radially from the inner wall to the outer wall of the body 200. This method connects the inner and outer walls of the body 200, thereby cooling the drill bit and enhancing the cooling effect.

[0025] In the above embodiment, a plurality of straight inlets 301 are arranged in a uniform circular array with the central axis of the tire body 200 as the axis.

[0026] In some other embodiments of this application, the main waterway 300 also includes a plurality of water passages 302, which are correspondingly arranged with the straight water outlets 301 and are arranged between two adjacent fan-shaped working blocks 201. The water passages 302 are arranged along the outer side wall of the tire body 200, smoothly transitioning from the bottom end of the straight water outlets 301 to the outer side wall of the steel body 100.

[0027] In the above embodiment, the coolant introduced from the inner wall of the drill bit flows to the outer wall through the main water channel. By designing multiple straight water inlets 301, it is convenient to cool the drill bit during drilling. The design of the water tank 302 increases the flow rate of the flushing fluid and improves the flushing, chip removal and cooling effect on the drill bit.

[0028] In some other embodiments of this application, the stepped drill bit also includes a heat dissipation structure 400, which includes a plurality of heat dissipation holes 401, each heat dissipation hole 401 being disposed on the waist of the straight water inlet 301.

[0029] In the above embodiment, the heat dissipation hole 401 connects the cavity of the steel body 100 to the main water channel 300. This method improves heat dissipation and ensures the effective service life of the drill bit.

[0030] In some other embodiments of this application, the outer diameter of the steel body 100 is smaller than the outer diameter of the matrix 200. A plurality of polycrystalline materials 500 are uniformly embedded in the inner and outer sidewalls of each sector-shaped working block 201.

[0031] In the above embodiment, the outer diameter of the matrix 200 is larger than the outer diameter of the steel body 100. Therefore, when the drill bit rotates and drills underground, the matrix 200 will wear. At this time, the polycrystalline 500 will protrude slightly from the outer wall of the matrix 200. The polycrystalline 500 will protect the matrix 200 from contacting the drilled object first, thereby extending the service life of the drill bit.

[0032] The operating principle of this application is as follows: When drilling is required, the stepped drill bit is set downwards, that is, the drilling face of the matrix 200 first contacts the object to be drilled (such as a coal seam). Under the action of high-speed rotation and a certain pressure, the matrix 200 frictionally cuts the contact surface with the object to be drilled to break the object. During the drilling process, high-pressure coolant is injected into the steel body 100 of the stepped drill bit (both the steel body 100 and the matrix 200 are hollow cylindrical bodies). The coolant flows from the inner side wall of the matrix 200 through the straight water inlet 301 to the water passage 302, and reaches the outer side wall of the matrix 200. Under the action of pressure difference, the coolant returns from the water passage 302 to the annular gap formed between the borehole and the drill rod, and finally returns from the annular gap in the borehole to the ground. At the same time, the coolant carries away the coal slag and other debris generated during the drilling process, reducing the accumulation of debris between the matrix 200 and the object to be drilled, and ensuring the normal progress of the drilling work.

[0033] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0034] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A stepped drill bit, characterized in that, Include: steel body; The steel body is a hollow columnar body; The tire body is connected to one end of the steel body, and the tire body is a hollow cylindrical body; The end of the tire carcass facing away from the steel body is configured as a drilling face; The tire body is divided into several sector-shaped working blocks by the main waterway; The main waterway includes several straight water inlets, which are trapezoidal in shape and extend from the inner wall to the outer wall along the radial direction of the tire body. The main waterway also includes several water passages, which are arranged corresponding to the straight water outlets and are located between two adjacent fan-shaped working blocks. The water passages are arranged along the outer side wall of the tire body, smoothly transitioning from the bottom end of the straight water outlet to the outer side wall of the steel body. Each of the aforementioned sector-shaped working blocks comprises several stepped sections that are coaxial with the steel body and whose outer diameter decreases sequentially along the drilling direction; A heat dissipation structure comprising a plurality of heat dissipation holes, each of which is disposed at the waist of the straight water inlet.

2. The stepped drill bit as described in claim 1, characterized in that, A threaded structure is provided on the inner or outer wall of the steel body at the end opposite to the tire body.

3. The stepped drill bit as described in claim 1, characterized in that, The steel body and the matrix are integrally sintered.

4. The stepped drill bit as described in claim 1, characterized in that, The outer diameter of the steel body is smaller than the outer diameter of the tire body.

5. The stepped drill bit as described in claim 1, characterized in that, Several straight water inlets are arranged in a uniform circular array with the central axis of the tire body as the center.

6. The stepped drill bit as described in claim 1, characterized in that, The heat dissipation holes connect the cavity of the steel body to the main water channel.

7. The stepped drill bit as described in claim 1, characterized in that, Each of the aforementioned sector-shaped working blocks has several polycrystals uniformly embedded in its inner and outer sidewalls.

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