Center drill bit of impactor

Abstract

The utility model provides a center drill bit of an impactor. The center drill bit comprises a guide drill bit and a drill ring, vertical air holes are formed in the middle of the guide drill bit in the axial lead direction and evenly distributed around the axial lead, clamping and embedding tables used for being connected with the drill ring in a clamped mode are arranged on the outer circumferential face of the lower end of the guide drill bit at intervals, and clamping and connecting tables corresponding to the clamping and embedding tables are arranged on the inner circumferential face of the drill ring. And the drill ring is clamped at the end part of the guide drill bit through the matching of the clamping table and the clamping and embedding table. By changing the structure of the drill bit, adopting the matching of the guide drill bit and the drill ring and increasing the distance between the guide drill bit and the hole wall, drilling cuttings are discharged more easily, the air hole layout and the chip removal structure are optimized, and the problems that in the prior art, a drill bit is not smooth in slag removal and low in airflow efficiency are effectively solved.

Description

Technical Field

[0001] The utility model relates to the field of drill bits, in particular to a center drill bit of an impactor. Background Art

[0002] The drill bit is a tool used by the drilling rig for drilling operations. The drill bit is connected to the impactor when working. The impactor drives the drill bit to rotate and uses the repeated action of the impact hammer on the drill bit to cause the drill bit to continuously impact the rock to achieve the purpose of breaking the rock. For rock, which is a wear-resistant but fragile material, the combination of the impact and rotation of the drill bit will greatly speed up the drilling speed of the drill rig. Since a large amount of rock debris will be generated during the drilling process of the drilling rig, the debris will gather between the drill rod and the hole wall to generate a resistance torque on the rotating drill rod, forcing the drilling rig to stop working. Therefore, in the prior art, an air hole is set at the bottom of the drill bit. A part of the high-pressure airflow from the impactor will blow the broken rock debris in front of the drill bit through this air hole, and carry the rock debris out of the hole along the channel between the drill rod and the hole wall.

[0003] The prior art CN201410692261.4 discloses an impact drill bit, including a drill body and a drill rod, the drill body head is provided with a circular end face, an annular bevel is provided on the outer periphery of the end face, the annular bevel is inclined from top to bottom and from inside to outside, the end face is perpendicular to the axis of the drill body, a plurality of internal teeth are provided on the end face, a plurality of side teeth are provided on the annular bevel, a side air hole is opened on the front side of the drill body, the side air hole is connected to the main air hole provided in the drill rod, the side air hole is inclined from top to bottom and from outside to inside, an end face air hole connected to the side air hole is provided on the end face, and the internal opening of the end face air hole is located in the side air hole. Although the invention discharges the paste-like substance squeezed into the end face air hole from the side air hole through the side air hole to prevent the paste-like substance from entering the impactor cavity, the following problems still exist:

[0004] 1. In this invention, since the side air holes are arranged obliquely from top to bottom and from outside to inside, when the pressure of the paste-like substance (i.e., a mixture of rock slag and water or mud) generated during the drilling process is relatively high, this part of the substance may form a certain blocking effect on the airflow, making it impossible for the high-pressure airflow to fully and effectively blow the rock slag away from the front end of the drill bit, affecting the slag cleaning effect and the drilling speed.

[0005] 2. The end face air holes are directly connected to the side air holes, and their internal openings are located in the side air holes. Such a structure may restrict the smooth flow of airflow, especially when the air pressure fluctuates or the paste is blocked, which can easily cause local turbulence or dead corners of the airflow, affecting the efficiency of the entire airflow system. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a center drill bit of an impactor, which changes the structure of the drill bit, adopts the combination of a guide drill bit and a drill ring, increases the distance between the guide drill bit and the hole wall, makes it easier to discharge drill cuttings, and optimizes the pore layout and chip removal structure, effectively solving the problems of poor drill bit slag cleaning and low airflow efficiency in the prior art.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] Provided is a center drill bit for an impactor, comprising: a guide drill bit and a drill ring;

[0009] The middle part of the guide drill bit is provided with vertical air holes along the axis direction, and the vertical air holes are evenly distributed around the axis. The outer circumferential surface of the lower end of the guide drill bit is provided with embedded platforms for clamping the drill ring at intervals, and the inner circumferential surface of the drill ring is provided with a clamping platform corresponding to the embedded platform. The drill ring is clamped to the end of the guide drill bit through the cooperation of the clamping platform and the embedded platform.

[0010] It should be noted that by setting a plurality of vertical air holes in the middle part of the guide drill bit, these air holes are evenly distributed along the axial direction, which are used to introduce compressed air or other fluids during the drilling process to help remove drill cuttings and cool the drill bit; the embedding table provided on the outer circumferential surface of the lower end of the guide drill bit cooperates with the clamping table on the inner circumferential surface of the drill ring to achieve rapid assembly and disassembly of the drill ring. Not only does the drill ring increase the distance between the guide drill bit and the wall of the borehole, making it easier to discharge drill cuttings, but it also makes it easier to maintain and replace the drill ring, thereby improving operational flexibility and economy. At the same time, the vertical air holes help to improve heat dissipation and chip removal during the drilling process, prevent the drill bit from overheating, extend the service life of the drill bit, and improve drilling efficiency.

[0011] Preferably, a chip groove is provided on the end face of the guide drill bit corresponding to the vertical air holes, the chip groove is V-shaped as a whole, and the corresponding vertical air holes are arranged on the end face of the guide drill bit at equal intervals, and the vertical air holes are located at the intersection of the V-shaped chip grooves.

[0012] It should be noted that V-shaped chip grooves corresponding to the vertical air holes are added to the end face of the guide drill bit. These chip grooves can more effectively guide the debris at the bottom to be discharged from the drill hole, avoid clogging the drill hole, and keep the drilling channel unobstructed. The air holes are located at the intersection of the V-shaped grooves, which further optimizes the airflow path, enhances the chip removal effect, significantly improves the cleanliness during the drilling process, reduces damage to the drill tool and the decrease in drilling efficiency due to blockage, and further improves operating efficiency.

[0013] Preferably, both ends of the V-shaped chip groove are arc-shaped as a whole.

[0014] It should be noted that the arc design at both ends of the V-shaped chip groove helps the chips to transition smoothly, reduce chip accumulation and friction, make chip removal smoother, reduce the wear of chips on the drilling surface, reduce energy consumption, extend the life of the drill bit, and also improve the continuity and quality of drilling.

[0015] Preferably, a gap is provided at the interval between the clamping positions of the drill ring and the guide drill bit corresponding to the clamping table, and both ends of the V-shaped chip groove are connected to the gap between the drill ring and the guide drill bit.

[0016] It should be noted that there are gaps at the clamping position of the drill ring and the guide drill bit, and these gaps are connected to the two ends of the V-shaped chip groove, forming a more effective chip removal channel, so that a large amount of debris generated by drilling can be quickly discharged through the gaps and the chip grooves, avoiding overheating or jamming of the drill bit due to debris accumulation, and improving the continuity and stability of the drilling process.

[0017] Preferably, a vertical groove is provided on the outer side wall of the lower end of the guide drill bit corresponding to the empty space, and a side air hole connected with the vertical air hole is provided in the groove.

[0018] It should be noted that the vertical groove on the outer wall of the lower end of the guide drill bit and the side air holes therein increase the airflow introduction path, form a multi-directional airflow auxiliary system, increase the coverage area of ​​the airflow, more thoroughly remove the drill cuttings at the lower end of the guide drill bit, reduce the temperature of the drill bit and the borehole wall, and improve the durability of the drill bit and operational safety.

[0019] Preferably, convex points are evenly distributed on the end faces of the guide drill bit and the drill ring.

[0020] It should be noted that the raised points (hemispherical or conical) on the end faces of the guide drill bit and drill collar can increase the point pressure on the rock during drilling, help break the rock and increase the drilling speed. At the same time, these raised points can also disperse the drilling force, reduce the wear of a single contact point and extend the life of the drill bit.

[0021] Preferably, the convex point is a hemispherical or conical structure.

[0022] It should be noted that the protrusions adopt a hemispherical or conical structure. This shape can better adapt to the rock surface, concentrate stress on a small area of ​​the rock, and promote rock cracking. At the same time, these shapes of protrusions are also self-sharpening, can maintain good drilling efficiency, reduce drill bit passivation, and improve overall drilling performance.

[0023] Beneficial effects of the utility model:

[0024] The utility model provides a center drill bit of an impactor, which realizes the rapid assembly and disassembly of the drill ring by utilizing the ingenious cooperation between the guide drill bit and the drill ring through the clamping table and the clamping table, thereby improving the operation flexibility, reducing the downtime, increasing the distance between the guide drill bit and the hole wall, and promoting the removal of drill cuttings. The vertical air hole arranged in the middle of the guide drill bit is combined with the V-shaped chip removal groove on the end face, which not only effectively introduces compressed air or other fluids to help remove the drill cuttings and cool the drill bit, but also optimizes the air flow path through the careful layout of the air hole and the V-shaped groove, greatly enhancing the chip removal effect, and reducing the heat accumulation during the drilling process. Accumulated tool wear, the arc design at both ends of the V-shaped chip groove and the gap design between the drill collar and the guide drill bit not only ensure the smooth discharge of debris and reduce the wear of the drilling surface, in addition, the vertical groove and side air hole design on the outer wall of the lower end of the guide drill bit further enhance the airflow-assisted chip removal and cooling effect, and protect the drill bit from overheating damage. The convex point design on the end face of the guide drill bit and drill collar, especially the hemispherical or conical structure, can not only effectively crush rocks and speed up the drilling speed, but also reduce single-point wear by dispersing the drilling force, maintain the sharpness of the drill bit, and ensure continuous and efficient drilling operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of a center drill bit of an impactor according to Example 1 of the utility model.

[0026] Figure 2 This is a bottom view of a center drill bit of an impactor according to Example 1 of the utility model.

[0027] Figure 3 This is a disassembly diagram of a center drill bit of an impactor according to Example 1 of the utility model.

[0028] Figure 4 This is a cross-sectional view of the guide drill bit of Example 1 of the utility model.

[0029] In the figure: 1, guide drill bit; 11, clamping table; 2, drill ring; 21, clamping table; 3, vertical air hole; 4, chip groove; 5, gap; 6, groove; 7, side air hole; 8, protrusion.

[0030] It should be noted that these drawings and text descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Example 1

[0033] like Figure 1-Figure 4 As shown, a center drill bit of an impactor comprises: a guide drill bit 1 and a drill ring 2;

[0034] A vertical air hole 3 is arranged in the middle of the guide drill bit 1 along the axis direction, and the vertical air holes 3 are evenly distributed around the axis. The outer circumferential surface of the lower end of the guide drill bit 1 is provided with a clamping platform 11 for clamping the drill ring 2 at intervals, and the inner circumferential surface of the drill ring 2 is provided with a clamping platform 21 corresponding to the clamping platform 11. The drill ring 2 is clamped to the end of the guide drill bit 1 through the cooperation of the clamping platform 21 and the clamping platform 11.

[0035] A chip groove 4 is provided on the end face of the guide drill bit 1 corresponding to the vertical air holes 3. The chip groove 4 is V-shaped as a whole and is arranged on the end face of the guide drill bit 1 at equal intervals corresponding to the vertical air holes 3. The vertical air holes 3 are located at the intersection of the V-shaped chip groove 4.

[0036] Both ends of the V-shaped chip removal groove 4 are arc-shaped as a whole.

[0037] A gap 5 is arranged at a distance corresponding to the embedding platform 11 at the engaging position between the drill ring 2 and the guide drill bit 1 , and both ends of the V-shaped chip groove 4 are connected to the gap 5 between the drill ring 2 and the guide drill bit 1 .

[0038] A vertical groove 6 is provided on the outer side wall of the lower end of the guide drill bit 1 corresponding to the gap 5 , and a side air hole 7 connected with the vertical air hole 3 is provided in the groove 6 .

[0039] The end surfaces of the guide drill bit 1 and the drill ring 2 are evenly provided with protrusions 8 .

[0040] The convex point 8 is a hemispherical structure.

[0041] Working principle and use method of the center drill bit of an impactor of this embodiment:

[0042] The center drill bit of the impactor provided in this embodiment is a center drill bit of the impactor. The clamping table 11 on the outer circumferential surface of the lower end of the guide drill bit 1 cooperates with the clamping table 21 on the inner circumferential surface of the drill collar 2, so that the guide drill bit 1 and the drill collar 2 form a stable and quickly replaceable connection, which is convenient for quickly replacing the worn drill collar 2 on site, reducing downtime, and increasing the distance between the guide drill bit 1 and the hole wall, which promotes the removal of drill chips. The gap 5 between the drill collar 2 and the guide drill bit 1 is connected to the V-shaped chip removal groove 4, which further promotes the effective discharge of drilling debris. At the same time, the middle part of the guide drill bit 1 is provided with a The vertical air holes 3, the chip grooves 4 on the end face and the side air holes 7 on the outer side wall of the lower end together constitute an efficient airflow auxiliary system. Compressed air or other fluids enter through the vertical air holes 3, which can not only effectively remove the debris in the drilling process, but also cool the drill bit, reduce the wear caused by overheating, and extend the service life of the drill bit; the arc treatment at both ends of the V-shaped chip groove 4 helps the smooth discharge of debris to avoid blockage. At the same time, the air holes are located at the intersection of the V-shaped grooves, which further promotes the effective discharge of airflow and debris, keeps the drilling clear, and improves the drilling efficiency.

[0043] When in use, select a suitable combination of drill collar 2 and guide drill bit 1 according to drilling requirements, ensure that the embedding stage 11 is aligned with the clamping stage 21, complete the assembly of the drill bit through a simple clamping operation, check whether the assembly of the guide drill bit 1 and the drill collar 2 is stable, whether the air holes are unobstructed, and confirm that the chip groove 4 and the gap 5 are unobstructed, then connect the air path system of the impactor with the upper end of the guide drill bit 1, turn on the air source to provide air flow output during the drilling process, turn on the power, let the impact drill run without load for a period of time to ensure good lubrication, and then gradually increase the pressure to the working surface. When drilling holes in different materials, according to the hardness of the material Adjust the speed and strength of the impact drill, keep the drill bit perpendicular to the workpiece surface, and apply force evenly. During the drilling process, the airflow will automatically intervene to help remove the drill chips and cool the drill bit, so that the drill chips are transported along the chip groove 4 to the gap 5 between the guide drill bit 1 and the drill ring 2, and then discharged from the drill hole in the groove 6 on the side of the guide drill bit 1. The operator needs to adjust the drilling pressure and drilling speed in time according to the drilling depth and material hardness. After the drilling operation is completed, clean the residue on the drill bit and drill ring 2 in time, check the wear condition, and if the drill ring 2 is severely worn, use its convenient clamping design to quickly replace the new drill ring 2 to maintain the performance of the drill bit.

[0044] Finally, it should be noted that the above is only a preferred embodiment of the utility model, which is only used to illustrate the technical solution of the utility model, and is not used to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model are included in the protection scope of the utility model.

[0045] In the description of the present invention, it needs to be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "upper end", "lower end", "upper surface", "lower surface", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 the present invention.

[0046] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connection" and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

Claims

1. A center drill bit of an impactor, comprising: A guide drill bit (1) and a drill ring (2); characterized in that: a vertical air hole (3) is arranged in the middle of the guide drill bit (1) along the axis direction, and the vertical air holes (3) are evenly distributed around the axis; a clamping platform (11) for clamping the drill ring (2) is arranged at intervals on the outer circumferential surface of the lower end of the guide drill bit (1); a clamping platform (21) corresponding to the clamping platform (11) is arranged on the inner circumferential surface of the drill ring (2); the drill ring (2) is clamped to the end of the guide drill bit (1) through the cooperation of the clamping platform (21) and the clamping platform (11).

2. The center drill bit of the impactor according to claim 1, characterized in that: The end surface of the guide drill bit (1) is provided with a chip removal groove (4) corresponding to the vertical air hole (3); the chip removal groove (4) is V-shaped as a whole, and is arranged on the end surface of the guide drill bit (1) at equal intervals corresponding to the vertical air holes (3), and the vertical air holes (3) are located at the intersection of the V-shaped chip removal groove (4).

3. The center drill bit of the impactor according to claim 2, characterized in that: Both ends of the V-shaped chip removal groove (4) are arc-shaped as a whole.

4. The center drill bit of the impactor according to claim 2, characterized in that: A gap (5) is arranged at a distance corresponding to the locking platform (11) at the locking position of the drill ring (2) and the guide drill bit (1), and both ends of the V-shaped chip groove (4) are connected to the gap (5) between the drill ring (2) and the guide drill bit (1).

5. The center drill bit of the impactor according to claim 4, characterized in that: A vertical groove (6) is provided on the outer side wall of the lower end of the guide drill bit (1) corresponding to the gap (5), and a side air hole (7) communicating with the vertical air hole (3) is provided in the groove (6).

6. The center drill bit of the impactor according to claim 1, characterized in that: The end surfaces of the guide drill bit (1) and the drill ring (2) are evenly provided with convex points (8).

7. The center drill bit of the impactor according to claim 6, characterized in that: The convex point (8) is a hemispherical or conical structure.

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