Novel drill bit structure

Abstract

The utility model relates to the technical field of material strength test drill bit equipment, in particular to a novel drill bit structure. Comprising a supporting piece, a drill bit is arranged in the supporting piece, a cutting head is fixed to one end of the drill bit, first cutting faces are formed in the tops and the bottoms of the ends, away from the drill bit, of the cutting head, and air outlet holes are formed in the ends, close to the cutting head, of the drill bit and located on the two sides of the first cutting faces; a step table is fixed to the outer side of the drill bit and located at one end of the cutting head, and a second air inlet hole is formed in the step table. According to the novel drill bit structure, through the cooperation of the fixing piece, the sealing sleeve, the drill bit, the second air inlet hole and the air outlet hole, when the drill bit works, air enters from the first air inlet hole and is discharged from the air outlet hole through the mutual cooperation of the first air inlet hole, the second air inlet hole and the air outlet hole, slag discharging is carried out through assistance and the like, and the service life of the drill bit is prolonged. And therefore, additional loads except for the cutting load are effectively prevented from being generated.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bit equipment for material strength testing, and particularly relates to a novel drill bit structure. Background Art

[0002] Drilling is a very common process in engineering, including fields such as material processing, oil and geophysical prospecting drilling, civil and mining engineering drilling, etc. Drilling mainly involves the drill rig using an electric motor, a hydraulic motor, or a pneumatic motor, etc. as the rotational power source to provide the rotational power for the drill pipe to cut the material, and then the combination of rotational motion and propulsion motion realizes the cutting of the material.

[0003] Various studies have shown that there is a quantitative relationship between the mechanical parameters during the material cutting process and the strength parameters of the material. For example, Japanese scholar Nishimatsu established the relationship between rock strength parameters and cutting force based on the Mohr-Coulomb criterion (The mechanics of rock cutting. Int. J. Rock Mech. Min. Sci. Vol. 9, pp. 261-270.), and Kalantari et al. considered the existence of broken bodies during the rock-breaking process of the drill bit and established the relationship between the drilling torque and thrust force and rock strength (Kalantari S, Baghbanan A, Hashemalhosseini H. An analytical model for estimating rock strength parameters from small-scale drilling data[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2019, 11(01): 135-145.). Therefore, it has been proven from theory and experiments that using the mechanical parameters during the material cutting process to predict the material strength is an effective method. Some scholars also use the parameters during the engineering drilling process to predict the changes in lithology (Wang Yuheng, Yu Qinglei, Niu Peng, etc. Research on the characterization model of uniaxial compressive strength of rock based on drilling parameters[J]. Journal of Northeastern University: Natural Science Edition, 2023, 44(8): 1168-1176.). The essence of using drilling cutting to detect the strength of materials is to establish the relationship between material strength parameters and cutting parameters based on the cutting mechanism. Therefore, the final measured parameters such as cutting force and torque must be the loads feedback during the material cutting failure process. However, during the material drilling process, there are many accompanying loads, such as the friction force between the drill pipe part and the material, the friction force between the side of the cutting alloy head and the material, and the additional loads and friction caused by the poor chip removal resulting in the repeated crushing of rock chips at the bottom of the hole. These additional loads change with the drilling depth and cannot be quantitatively expressed, resulting in the measured load being larger than the pure cutting load, and thus the material strength parameters obtained by inversion being inaccurate. It can be seen that to solve the problem of accurately evaluating the material strength using drilling parameters, the main issues to be solved are to avoid the friction problems other than material cutting and to achieve rapid chip removal;

[0004] When using the above technologies, the following technical problems are found in the existing technologies: The existing drill bits are not convenient for air intake and chip removal during use. Therefore, a new drill bit structure is designed to provide another technical solution to the above technical problems. Utility Model Content

[0005] Based on this, it is necessary to provide a new drill bit structure for the above technical problems to solve the technical problem that the existing drill bits are not convenient for air intake and chip removal during use.

[0006] To solve the above technical problems, the present utility model adopts the following technical solutions:

[0007] A new drill bit structure includes a support member. A drill bit is disposed inside the support member. A cutting head is fixed to one end of the drill bit. First cutting surfaces are formed at the top and bottom of both ends of the cutting head away from the drill bit. Air outlet holes are formed on both sides of the first cutting surfaces inside the drill bit near the cutting head. A stepped platform is fixed to the outside of the drill bit at the end of the cutting head. A second air intake hole is formed inside the stepped platform. A through hole is formed inside the drill bit. The through hole communicates with the second air intake hole. Connecting holes are formed on both sides of the through hole away from the second air intake hole. The through hole communicates with the air outlet holes through the connecting holes.

[0008] As a preferred embodiment of the new drill bit structure provided by the present utility model, the support member includes a support cylinder, a fixing member, and a protective sleeve. A fixing member is fixed to one end of the support cylinder. A protective sleeve is fixed to one end of the fixing member.

[0009] As a preferred embodiment of the new drill bit structure provided by the present utility model, tooth-shaped grooves are evenly formed inside the protective sleeve away from the fixing member.

[0010] As a preferred embodiment of the new drill bit structure provided by the present utility model, second cutting surfaces are formed on both sides of the top and bottom of the cutting head, and the distance between the second cutting surface at the top and the second cutting surface at the bottom is greater than the diameter of the drill bit.

[0011] As a preferred embodiment of the new drill bit structure provided by the present utility model, the cutting head forms a cutting edge through two first cutting surfaces of the same height away from the drill bit, and side cutting edges are formed at the top and bottom of the cutting head through two corresponding second cutting surfaces.

[0012] As a preferred embodiment of the new drill bit structure provided by the present utility model, the axis of the through hole is perpendicular to the axis of the second air intake hole.

[0013] As a preferred embodiment of the novel drill bit structure provided by the present utility model, a sealing sleeve is rotatably connected to the outer side of the stepped platform. A locking nut is threadedly connected to the outer side of the stepped platform and at one end of the sealing sleeve. Sealing rings are arranged at both ends of the outer side of the stepped platform and inside the sealing sleeve, and the sealing rings are located at both ends of the second air inlet hole. One side of the sealing sleeve is slidably connected to the fixing member, and a first air inlet hole is formed inside one side of the sealing sleeve.

[0014] As a preferred embodiment of the novel drill bit structure provided by the present utility model, a sliding groove is formed inside one side of the fixing member, and the sealing sleeve is slidably connected to the fixing member through the sliding groove.

[0015] It can be seen without doubt that through the above technical solutions of the present application, the technical problems to be solved by the present application can surely be solved.

[0016] Meanwhile, through the above technical solutions, the present utility model has at least the following beneficial effects:

[0017] For the novel drill bit structure provided by the present utility model, through the cooperation of the fixing member, the sealing sleeve, the drill bit, the second air inlet hole and the air outlet hole, when the drill bit is working, through the mutual cooperation of the first air inlet hole, the second air inlet hole and the air outlet hole, air can enter from the first air inlet hole and be discharged from the air outlet hole, so as to discharge slag through auxiliary means, thereby effectively avoiding the generation of additional loads other than the cutting load.

[0018] Through the assembly of the cutting head and the design of the cutting edge, when the drill bit is working, in addition to the front cutting edge cutting the material, it can avoid the additional loads generated by other parts of the drill bit cutting and rubbing the material.

[0019] Through the cooperation of the sealing sleeve, the sealing rings and the locking nut, the air entering through the first air inlet hole can directly enter the inside of the second air inlet hole under the limitation of the two sealing rings, and at the same time, the locking nut fixes the position of the sealing sleeve outside the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0022] Figure 2 It is a schematic diagram of the internal structure of the fixing member of the present utility model;

[0023] Figure 3 This is a schematic diagram of the internal structure of the sealing sleeve of the present utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the sealing ring of the present utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the air outlet hole of the present utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the through hole of the present utility model;

[0027] Figure 7 This is a schematic diagram of the cutting principle of the present utility model;

[0028] Figure 8 This is a schematic diagram of the cutting head of the present utility model;

[0029] Figure 9 of the present utility model Figure 8 cross-sectional view.

[0030] In the figure: 1, support cylinder; 2, fixing member; 3, protective sleeve; 4, sealing sleeve; 5, first air inlet hole; 6, drill bit; 7, second air inlet hole; 8, sealing ring; 9, locking nut; 10, sliding groove; 11, cutting head; 12, air outlet hole; 13, first cutting surface; 14, through hole; 15, connecting hole; 16, second cutting surface. Specific embodiments

[0031] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0032] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings.

[0033] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments can be combined with each other.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] Embodiment 1

[0036] Refer to Figures 1 - 6, a new type of drill bit structure, including a support member. The support member includes a support cylinder 1, a fixing member 2, and a protective sleeve 3. One end of the support cylinder 1 is fixed with the fixing member 2, and one end of the fixing member 2 is fixed with the protective sleeve 3. Tooth-shaped grooves are evenly arranged inside the end of the protective sleeve 3 away from the fixing member 2, so that the support cylinder 1, the fixing member 2, and the protective sleeve 3 can be integrally formed, and an external connection device can enter from the inside of the end of the support cylinder 1 away from the fixing member 2, thereby driving the support cylinder 1, the fixing member 2, and the protective sleeve 3 to work. A drill bit 6 is arranged inside the support member, so that an external device can enter from the inside of the support cylinder 1 and drive the support member and the drill bit 6 to work simultaneously;

[0037] One end of the drill bit 6 is fixed with a cutting head 11, so that the rotation of the drill bit 6 drives the cutting head 11 to rotate inside the protective sleeve 3, or the cutting head 11 follows the rotation of the protective sleeve 3. First cutting surfaces 13 are arranged at the top and bottom of both ends of the cutting head 11 away from the drill bit 6. The end of the cutting head 11 away from the drill bit 6 forms a cutting edge through two first cutting surfaces 13 of the same height. Thus, the rotation of the drill bit 6 performs cutting through the cutting head 11, the first cutting surface 13, and the cutting edge. Second cutting surfaces 16 are arranged on both sides of the top and bottom of the cutting head 11, and the distance between the second cutting surface 16 at the top and the second cutting surface 16 at the bottom is greater than the diameter of the drill bit 6, being larger at the front and smaller at the back, aiming to avoid additional cutting force and friction. The top and bottom of the cutting head 11 form side cutting edges through two corresponding second cutting surfaces 16;

[0038] Air outlet holes 12 are arranged on both sides of the inside of the drill bit 6 near the cutting head 11 and located at the first cutting surface 13, so as to assist in discharging the slag cut by the cutting head 11 and the cutting edge through the air blown out from the air outlet holes 12. A stepped platform is fixed at one end of the outside of the drill bit 6 and located at the cutting head 11. A second air inlet hole 7 is arranged inside the stepped platform. A through hole 14 is arranged inside the drill bit 6, and the through hole 14 communicates with the second air inlet hole 7. The axis of the through hole 14 is perpendicular to the axis of the second air inlet hole 7. Connection holes 15 are arranged on both sides of the end of the through hole 14 away from the second air inlet hole 7. The through hole 14 communicates with the air outlet holes 12 through the connection holes 15, so that the air entering through the second air inlet hole 7 enters the inside of the air outlet holes 12 through the through hole 14 and the connection holes 15;

[0039] A sealing sleeve 4 is rotatably connected to the outside of the stepped platform, so that the stepped platform and the sealing sleeve 4 can rotate relative to each other, and the sealing sleeve 4 enters the outside of the stepped platform through one end of the stepped platform. A locking nut 9 is threadedly connected to the outside of the stepped platform and located at one end of the sealing sleeve 4, so as to prevent the sealing sleeve 4 from separating from the stepped platform through the locking nut 9. Sealing rings 8 are arranged at both ends of the outside of the stepped platform and located inside the sealing sleeve 4, and the sealing rings 8 are located at both ends of the second air inlet hole 7, so as to increase the sealing effect of the gas after the sealing sleeve 4 is connected to the stepped platform through the sealing rings 8;

[0040] In this embodiment, the sealing ring 8 of the O-ring can be used to seal the compressed air between the sealing sleeve 4 and the stepped platform. In other embodiments, the sealing ring 8 can be made of a copper sleeve or other wear-resistant materials.

[0041] One side of the sealing sleeve 4 is slidably connected to the fixing member 2, so that the sealing sleeve 4 can only be translated by sliding inside the fixing member 2 and cannot rotate. Furthermore, the sealing sleeve 4 can be adjusted adaptively according to the position of the drill bit 6. A sliding groove 10 is provided inside one side of the fixing member 2, and the sealing sleeve 4 is slidably connected to the fixing member 2 through the sliding groove 10. A first air inlet hole 5 is provided inside one side of the sealing sleeve 4, so that external air can enter the inside of the second air inlet hole 7 through the first air inlet hole 5.

[0042] The use process of a novel drill bit structure provided by the present utility model is as follows: When in use, the drill bit 6 is installed on a suitable external instrument. At the same time, according to the installation of the drill bit 6 and the external instrument inside the support cylinder 1, the positions of the drill bit 6 and the corresponding sealing sleeve 4 inside the sliding groove 10 are adjusted. Furthermore, when cutting and drilling an object through the cutting head 11, the protective sleeve 3 is used to prevent the splashing of cutting residues. At the same time, external compressed air enters through the first air inlet hole 5, and the compressed air inside the first air inlet hole 5 enters the inside of the second air inlet hole 7 under the sealing of the two sealing rings 8. Then, the compressed air inside the second air inlet hole 7 enters the inside of the through hole 14, and the compressed air inside the through hole 14 enters the inside of the air outlet hole 12 through the connecting hole 15 and is discharged. At this time, the compressed air blows out the slag through the tooth-shaped groove, effectively avoiding the generation of additional loads other than the cutting load.

[0043] Embodiment Two

[0044] Based on the above Embodiment One, a cutting method of a novel drill bit structure is disclosed with reference to Figures 7 - 9 , a cutting method of a novel drill bit structure.

[0045] In this embodiment, the maximum dimension in the diameter direction of the cutting head 11 is d, which is the aperture of the drill bit 6. The part of the front end of the cutting head 11 in contact with the measured material is designed with a cone angle of α, and the two sides of the tip are symmetric with respect to the axis of the drill bit 6, which is beneficial for drilling into the material. The cutting edges of the front end of the cutting head 11 for cutting the material are symmetrically set as wedge-shaped edges with an angle of 2C. In this way, when the drill bit 6 drills and cuts the material, a rake angle and a clearance angle will be formed. The rake angle and the clearance angle are complementary to each other, and the clearance angle should be greater than zero to avoid friction between the cutting edge and the rock during the cutting process.

[0046] At the rear end of the maximum diameter of the cutting head 11, an angle γ is designed. Its function is to make the diameter of the rear half part where the alloy head does not cut smaller, so as to avoid friction between it and the hole of the material to be measured. Similarly, the diameter of the drill bit 6 should be smaller than the minimum diameter part of the alloy head. The cutting head 11 is symmetrically designed with γ1 angles on both sides to avoid friction between the side of the alloy head and the hole wall.

[0047] Suppose that during the drilling process, the depth that the drill bit 6 enters the rock per revolution is h = v / n, where v is the advancing speed of the drill bit and n is the rotational speed of the drill bit. The chip thickness can be obtained as dh = h * sin(α / 2). From this, it can be seen that as long as the rotational speed and advancing speed of the drill bit 6 are precisely controlled, a constant cutting thickness dh can be obtained. The drill bit 6 maintains the same cutting thickness dh along the direction of the cutting edge. This can ensure that the cutting load obtained during the process of the drill bit 6 cutting the material and the chip formation mechanism maintain a corresponding relationship.

[0048] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments to better explain the principle and practical application of the present invention, so that those skilled in the relevant technical field can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A new drill bit structure, characterized in that: The invention comprises a support member, wherein a drill bit (6) is arranged inside the support member, a cutting head (11) is fixed at one end of the drill bit (6), first cutting surfaces (13) are provided at the top and bottom of both ends of the cutting head (11) away from the drill bit (6), air outlet holes (12) are provided inside the drill bit (6) close to the cutting head (11) and on both sides of the first cutting surface (13), a stepped platform is fixed outside the drill bit (6) and at one end of the cutting head (11), a second air inlet hole (7) is provided inside the stepped platform, a through hole (14) is provided inside the drill bit (6), the through hole (14) is connected with the second air inlet hole (7), connecting holes (15) are provided on both sides of the through hole (14) away from the second air inlet hole (7), and the through hole (14) is connected with the air outlet hole (12) through the connecting holes (15).

2. A new drill bit structure according to claim 1, characterized in that: The support member comprises a support tube (1), a fixing member (2) and a protective sleeve (3); the fixing member (2) is fixed to one end of the support tube (1), and the protective sleeve (3) is fixed to one end of the fixing member (2).

3. A new drill bit structure according to claim 2, characterized in that: Tooth-shaped grooves are evenly distributed inside the end of the protective sleeve (3) away from the fixing member (2).

4. A new drill bit structure according to claim 1, characterized in that: The cutting head (11) is provided with second cutting surfaces (16) on both the top and bottom sides, and the distance between the top second cutting surface (16) and the bottom second cutting surface (16) is greater than the diameter of the drill bit (6).

5. A new drill bit structure according to claim 4, characterized in that: The end of the cutting head (11) away from the drill bit (6) forms a cutting edge through two first cutting surfaces (13) at the same height, and the top and bottom of the cutting head (11) form side cutting edges through two corresponding second cutting surfaces (16).

6. A new drill bit structure according to claim 1, characterized in that: The axis of the through hole (14) and the axis of the second air inlet hole (7) are perpendicular to each other.

7. A new drill bit structure according to claim 2, characterized in that: The outer side of the step platform is rotatably connected to a sealing sleeve (4); a locking nut (9) is threadedly connected to the outer side of the step platform and located at one end of the sealing sleeve (4); sealing rings (8) are provided at both ends of the outer side of the step platform and located on the inner side of the sealing sleeve (4); and the sealing rings (8) are located at both ends of the second air inlet hole (7); one side of the sealing sleeve (4) is slidably connected to the fixing member (2); and a first air inlet hole (5) is provided inside one side of the sealing sleeve (4).

8. A new drill bit structure according to claim 7, characterized in that: A sliding groove (10) is provided inside one side of the fixing member (2), and the sealing sleeve (4) is slidably connected to the fixing member (2) via the sliding groove (10).

Images