Drill bit special for geological drilling process hole

Abstract

The utility model discloses a special drill bit for a geological drilling process hole, which comprises a drill bit body, the front end part of the drill bit body is a ball head, the surface of the ball head is a multi-stage inclined surface which is arranged from the end part to the tail part in a continuous transition manner, and the inclined angles of the multi-stage inclined surface are sequentially increased from front to back. Alloy spherical teeth which are arranged at intervals in the circumferential direction and protrude out of the dip angle face where the alloy spherical teeth are located are arranged on each dip angle face, knife-shaped teeth are arranged on the edge of the tail of each spherical head face, a slag discharging groove is formed between every two knife-shaped teeth, an air hole penetrating through the center of the drill bit body is formed in each slag discharging groove, and the tail end of the drill bit body is connected with a drill rod with a center hole. The air hole is communicated with the center hole of the drill rod. According to the multi-step hole drilling machine, auxiliary hole drilling, step face chambering and cutter drilling are integrated, auxiliary holes are firstly drilled in geological drilling operation, multi-step face self-positioning is achieved, the problems of hole deviation, non-standard holes, inconsistent hole diameters and the like in actual production are solved, working efficiency is improved, and production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of geological drilling equipment, in particular to a special drill bit for geological drilling process holes. Background Art

[0002] At present, when drilling for geological exploration, in order to improve work efficiency and meet actual production technical requirements, it is necessary to first drill a small hole (i.e., process hole) and then use a drill bit that is larger than the hole diameter to expand the hole diameter. However, in actual operation, since the drill bit cannot be accurately positioned, the process hole and the expanded hole are prone to deviation and misalignment, resulting in irregular holes and inconsistent hole sizes, causing the drill bit to be scrapped due to drill jamming and affecting work efficiency.

[0003] For example, the patent announcement number is: CN 212774175 U discloses a hole expansion guide device, which is used in the field of geological exploration. It includes a hole expansion drill bit and a guide tube fixedly connected to the hole expansion drill bit. Alloy bars are evenly distributed on the outer diameter of the guide tube. The diameter of the alloy bar and the guide tube is consistent with the diameter of the hole expansion drill bit. This application can make the drilling trajectory of the drill bit consistent with the original drilling trajectory through an auxiliary guide device, prevent hole expansion deviation, and deal with sharp bends in the hole caused by excessive full-angle change rate. The length of the guide tube and the alloy bar is consistent with the diameter of the drill bit, which can prevent hole expansion deviation and irregular hole diameter after expansion during the hole expansion process.

[0004] Although the above patent can prevent the problems of drill deviation and irregular hole diameter after expansion during drilling and expansion to a certain extent, it uses an additional expansion guide device, which increases the production cost. Moreover, it adopts two processes of drilling and expanding holes, and the process procedure is still complicated. In actual production, there is still a certain degree of error in the positioning and coordination of the two processes, which affects the drilling accuracy. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects and shortcomings of the prior art, provide a special drill bit for geological drilling process holes, and solve various problems existing in the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A drill bit specially used for geological drilling process holes comprises a drill bit body, the front end of the drill bit body is a ball head, and the ball head surface is a multi-stage inclination surface which is continuously transitioned from the end to the tail, the inclination angles of the multi-stage inclination surfaces increase successively from front to back, and each stage of the inclination surface is respectively provided with alloy ball teeth which are arranged at intervals in the circumferential direction and protrude from the inclination surface, knife-shaped teeth are arranged at the tail edge of the ball head surface, a slag discharge groove is provided between every two knife-shaped teeth, and air holes which pass through the center of the drill bit body are respectively provided in the slag discharge grooves, and the tail end of the drill bit body is connected to a drill rod with a center hole, and the air hole is communicated with the center hole of the drill rod.

[0008] The angle between the center of the end surface of the multi-level inclined surface and the first level is 10°, and each level of the inclined surface increases by 10° from front to back.

[0009] An alloy ball tooth is installed at the center of the front end surface of the ball head, and the alloy ball tooth faces forward, and the alloy ball teeth on each level of the remaining inclined surfaces are respectively perpendicular to the inclined surfaces at their locations.

[0010] The alloy ball teeth are evenly distributed on the corresponding inclined surfaces, and the positions of the alloy ball teeth on the adjacent inclined surfaces from front to back in the circumferential direction are staggered with each other.

[0011] Blind holes for installing alloy ball teeth are distributed on each step surface of the drill body, and the alloy ball teeth are welded in the blind holes of the drill body by high temperature.

[0012] The two side surfaces of the knife-shaped teeth are inclined surfaces, and the inclined angle is 45-60 degrees.

[0013] The tail of the drill body is connected to the drill rod through a transition connection device, and the transition connection device includes a connecting rod located at the center of the tail of the drill body. The upper end of the drill rod is provided with a connecting groove connected and fixed to the connecting rod.

[0014] A through hole connected to the drill rod is provided in the middle of the connecting rod, and clamping holes arranged at intervals are distributed in the circumferential direction of the upper end of the connecting rod. A spring is clamped and fixed in the clamping hole, and a top ball is installed at the end of the spring. Limiting holes corresponding to the top balls are distributed on the inner wall of the drill rod connecting groove.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model has a reasonable structural design, which integrates process hole drilling, step surface expansion and cutter drilling. In geological drilling operations, the process hole is drilled first to achieve self-positioning of multiple step surfaces, thus avoiding problems such as difficult positioning of expansion holes, deviation of holes, non-standard holes, inconsistent hole diameters, etc. in actual production. At the same time, the multi-level inclination surface has an angle of 10° for the first level, which increases by 10° from top to bottom, thereby reducing the weight of the drill bit body and increasing the positioning accuracy.

[0017] It can also realize geological segmentation drilling, which is beneficial for drilling and breaking dry and hard rock and soil layers and improving the efficiency of drilling geological wells. At the same time, slag discharge grooves are provided between the knife-shaped teeth to increase the powder discharge effect and effectively reduce the weight of the drill bit body.

[0018] In summary, the drill bit structure of the present application solves the problems of hole deviation, non-standard holes, inconsistent hole diameters, etc. in actual production, thereby improving work efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0020] Figure 2 The main structure of the utility model is connected to the shank tail cross-section;

[0021] Figure 3 This is a cross-sectional view of the main structure of the utility model;

[0022] Figure 4 It is a top view of the utility model.

[0023] Reference numerals:

[0024] 1. Drill bit body; 2. Multi-stage inclination surface; 3. Alloy ball teeth; 4. Knife-shaped teeth; 5. Slag discharge groove; 6. Air hole; 7. Transition connection device; 8. Top ball; 9. Spring; 10. Drill rod; 11. Connecting rod; 12. Through hole; 13. Mounting hole. DETAILED DESCRIPTION

[0025] 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.

[0026] See attached Figure 1-4 ;

[0027] A special drill bit for geological drilling process holes includes a drill bit body 1, the front end of the drill bit body 1 is a ball head, and the ball head surface is a multi-stage inclination surface 2 that is continuously transitioned from the end to the tail, the inclination of the multi-stage inclination surface 2 increases from front to back, and each stage of the inclination surface is respectively provided with alloy ball teeth 3 that are arranged at intervals in the circumferential direction and protrude from the inclination surface, and the tail edge of the ball head surface is provided with knife-shaped teeth 4, the two side surfaces of the knife-shaped teeth 4 are inclined surfaces, and the inclination angle is 45-60°. A slag discharge groove 5 is provided between every two knife-shaped teeth 4, and air holes 6 that pass through the center of the drill bit body are respectively provided in the slag discharge groove 5. A drill rod 10 with a center hole is connected to the tail end of the drill bit body 1, and the air hole 6 is connected to the center hole of the drill rod 10.

[0028] Furthermore, the angle between the end center of the multi-level inclination surface 2 and the first level is 10°, and each level of the inclination surface increases by 10° from front to back. Its layer-by-layer structural design realizes the self-positioning of the multi-level surface, avoiding the problems of difficult positioning of the hole expansion, deviation of the hole, irregular hole, inconsistent hole diameter, etc. in actual production, while reducing the weight of the drill body and increasing the positioning accuracy.

[0029] The alloy ball teeth are also distributed on the ball head according to a certain pattern. An alloy ball tooth 3 is installed at the center of the front end face of the ball head. The alloy ball tooth 3 faces forward, and the remaining alloy ball teeth 3 on each level of the inclination surface are respectively perpendicular to the inclination surface at the location. Through the structure of the ball teeth, the ball teeth are evenly distributed on the end face of each level of the inclination surface, bearing a roughly equal rock breaking area, which can ensure that each tooth is evenly stressed during rock breaking, and avoid the side teeth from being damaged prematurely due to uneven stress during rock drilling. The alloy ball teeth 3 are evenly distributed on the corresponding inclination surfaces, and the positions of the alloy ball teeth 3 in the circumferential direction on the adjacent inclination surfaces from front to back are staggered with each other. The mutually staggered ball teeth can realize drilling forces in different directions and positions, so that the drilling area is distributed with more points, which is more conducive to drilling.

[0030] Furthermore, blind holes for installing alloy ball teeth 3 are distributed on each step surface of the drill body 1, and the alloy ball teeth 3 are welded in the blind holes of the drill body by high temperature. The fixed and welded structure is stable. If the ball teeth are damaged, the drilling efficiency may be reduced, thereby affecting the practical life of the drill bit. The ball teeth in the above structure can also be replaceable. For example, the bottom root of the ball teeth is a columnar structure, and the root is provided with threads. Threaded mounting holes for installing the ball teeth are distributed on each step surface. The structure fixed by the threaded connection of the ball teeth makes the ball teeth replaceable. When the ball teeth are worn, the ball teeth can be directly replaced separately, which is economical and convenient.

[0031] Furthermore, the rear of the drill body 1 is connected to the drill rod 10 through a transition connection device 7. The transition connection device 7 includes a connecting rod 11 located at the center of the rear of the drill body 1. The upper end of the drill rod 10 is provided with a connecting groove connected and fixed to the connecting rod. A through hole 12 connected to the drill rod is provided in the middle of the connecting rod 11. The upper end of the connecting rod 11 is provided with spaced clamping holes 13 in the circumferential direction. A spring 9 is clamped and fixed in the clamping hole 13. A top ball 8 is installed at the end of the spring 9. The inner wall of the connecting groove of the drill rod 10 is provided with limiting holes corresponding to the top ball 8. The transition connection device is connected to the drill rod of the drilling rig, which facilitates the connection with the drill rod of the drilling rig. At the same time, the connection and fixing effect is good. In addition, the transition connection device realizes the axial connection locking and the limiting function in the circumferential radial direction through the clamping hole, spring, spring, and top ball structure, so that the drilling of the drill bit is more stable during the drilling process, thereby indirectly making the footage speed faster and improving the drilling efficiency.

[0032] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0033] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A drill bit for geological drilling process holes, comprising a drill bit body (1), characterized in that: The front end of the drill bit body (1) is a ball head, and the ball head surface is a multi-stage inclined surface (2) arranged in a continuous transition from the end to the tail, the inclination of the multi-stage inclined surface (2) increases from the front to the back, and each stage of the inclined surface is provided with alloy ball teeth (3) protruding from the inclined surface at intervals in the circumferential direction, knife-shaped teeth (4) are provided at the tail edge of the ball head surface, and a slag discharge groove (5) is provided between every two knife-shaped teeth (4), and each slag discharge groove (5) is provided with an air hole (6) penetrating the center of the drill bit body, and the tail end of the drill bit body (1) is connected to a drill rod (10) with a center hole, and the air hole (6) is connected to the center hole of the drill rod (10).

2. The special drill bit for geological drilling process holes according to claim 1, characterized in that: The angle between the center of the end face of the multi-level inclined surface (2) and the first level is 10°, and the angle of each level of the inclined surface increases by 10° from front to back.

3. The special drill bit for geological drilling process holes according to claim 1, characterized in that: An alloy ball tooth (3) is mounted at the center of the front end surface of the ball head, the alloy ball tooth (3) faces forward, and the alloy ball teeth (3) on each level of the remaining inclined surfaces are respectively perpendicular to the inclined surfaces at their locations.

4. The special drill bit for geological drilling process holes according to claim 1, characterized in that: The alloy ball teeth (3) are evenly distributed on corresponding inclined surfaces, and the positions of the alloy ball teeth (3) in the circumferential direction on adjacent inclined surfaces from front to back are staggered with each other.

5. The special drill bit for geological drilling process holes according to claim 1, characterized in that: Blind holes for installing alloy ball teeth (3) are distributed on each step surface of the drill body (1); the alloy ball teeth (3) are welded in the blind holes of the drill body by high temperature.

6. The special drill bit for geological drilling process holes according to claim 1, characterized in that: The two side surfaces of the knife-shaped teeth (4) are inclined surfaces, and the inclined angle is 45-60°.

7. The special drill bit for geological drilling process holes according to claim 1, characterized in that: The rear end of the drill bit body (1) is connected to a drill rod (10) via a transition connection device (7), wherein the transition connection device (7) comprises a connection rod (11) located at the center of the rear end of the drill bit body (1), and an upper end of the drill rod (10) is provided with a connection groove connected and fixed to the connection rod.

8. The special drill bit for geological drilling process holes according to claim 7, characterized in that: A through hole (12) communicating with the drill rod is provided in the middle of the connecting rod (11), and clamping holes (13) arranged at intervals are distributed in the circumferential direction of the upper end of the connecting rod (11), a spring (9) is clamped and fixed in the clamping hole (13), a top ball (8) is installed at the end of the spring (9), and limiting holes corresponding to the top ball (8) are distributed on the inner wall of the connecting groove of the drill rod (10).

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