Geological drilling spiral self-centering reamer

Abstract

A drill body is arranged to be of a conical structure, a platform is arranged on the head portion of the drill body, a positioning core is arranged in the center of the head portion of the drill body, the contact face between the drill body and a hole to be reamed is increased due to the arrangement of the positioning core, and the positioning core can play a role in positioning and guiding in the hole to be reamed. The cutting blades are evenly distributed on the platform and used for preliminary reaming, the spiral groove is formed in the surface of the drill body and facilitates smooth powder discharging, drill jamming is avoided, the rock drilling teeth are evenly distributed on the ridge of the spiral groove in the spiral direction, and the rock drilling teeth are matched with the cutting blades to cope with hard geological rocks. The drill bit can better cope with hard geological rocks, continuous drilling is guaranteed, and therefore the problem that holes are prone to deviation can be solved on the basis that the drilling speed of the drill bit is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the field of geological drilling tools, in particular to a geological drilling spiral self-coring reaming drill. Background Art

[0002] Geological drilling or exploration is the use of deep drilling mechanical engineering technology to extract natural resources underground or on the seabed, or to obtain cross-sections of strata and physical samples for experimental purposes and to obtain relevant data. A drill rig drills downward from the surface, creating cylindrical boreholes in the strata to identify and delineate strata.

[0003] The drilling rigs used are mainly divided into two types: rotary and impact. For example, patent publication number: CN103628821A discloses a coring drill bit suitable for drilling soft and hard objects. Although this patent can achieve simultaneous crushing of soft and hard rocks; there is a gap between the drill bit body and the hole wall to ensure smooth powder discharge, and the lower end of the cutting tool exceeds the inner diameter of the drill bit body, which can smoothly coring, and the cutting heat and friction heat are discharged from the bottom of the hole through the drill cuttings, reducing heat power consumption. However, since the cutting part of this drill bit is entirely in the cutting tool of the drill bit head, it is not easy to continue drilling when encountering harder geological rocks relying solely on the cutting tool. In actual operation, the overall conical structure of the drill bit head of this type of drill bit has a small contact surface with the drill hole, which can cause the drill hole to deviate easily, resulting in an irregular hole, which can easily cause the drill to get stuck and become scrapped. Utility Model Content

[0004] (1) Technical problems to be solved: In view of the problems that the existing geological drilling tools are not easy to continue drilling when encountering harder geological rocks due to their own structural defects, and the drill head is an overall conical structure with a small contact surface with the borehole, which makes the borehole easy to deviate, the utility model provides a geological drilling spiral self-centering reaming drill that can solve the above problems.

[0005] (2) The technical solutions adopted by this utility model are as follows:

[0006] A geological drilling spiral self-centering core reaming drill comprises a drill body having a conical structure, a spiral groove provided on the surface of the drill body, rock drilling teeth evenly distributed along the spiral direction on the ridges of the spiral groove, a platform provided on the head of the drill body, a positioning core provided at the center of the drill body head, shear blades evenly distributed on the platform, and a connecting end provided at the tail of the drill body.

[0007] A further technical solution is that an exhaust hole is provided on the platform near the root of the positioning core, a main air hole is provided at the center of the drill body, the main air hole runs through the tail of the drill body, and the exhaust hole is connected to the main air hole.

[0008] A further technical solution is that the angle between the hypotenuse of the axial cross section of the drill body and the axial direction is 10°-20°.

[0009] A further technical solution is that the cross section of the spiral groove is an arc-shaped structure.

[0010] A further technical solution is that the spiral groove is inclined at 8°-12°.

[0011] A further technical solution is that the rock drilling teeth are of spring-shaped structure and are welded in blind holes on the end face of the alloy ridge.

[0012] A further technical solution is that the shear blades are evenly distributed in an even number of 6 to 18.

[0013] A further technical solution is that: a rectangular left-hand thread is provided on the connecting end, and the pitch is 15.63 mm.

[0014] (3) Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: by setting the drill body into a conical structure, a platform is provided on the drill head, and a positioning core is provided in the center of the drill head. The setting of the positioning core increases the contact surface with the hole to be expanded. The positioning core is used to play a positioning and guiding role in the hole to be expanded. Shear blades are evenly distributed on the platform. The shear blades are used for preliminary expansion. The surface of the drill body is provided with spiral grooves. The spiral grooves are conducive to smooth powder discharge and avoid drill jamming. Rock drilling teeth are evenly distributed on the ridges of the spiral grooves along their spiral direction. The rock drilling teeth cooperate with the shear blades to cope with harder geological rocks. Compared with the traditional single cutting tool method, it can better cope with harder geological rocks and ensure continued drilling, thereby achieving the goal of solving the problem of easy deviation of the hole while ensuring the drilling speed of the drill bit.

[0015] The utility model has a simple structural design and is easy to operate. Through the spiral drill body structure design, a positioning core is provided in the center of the top of the drill body, rock drilling teeth are provided along the spiral line on the spiral groove ridge, and a platform is provided on the end face of the spiral body. Shear blades are evenly distributed on the platform, so that the rock drilling and hole expansion positioning is accurate, the footage speed is fast, the hole is standardized, and the hole size can be guaranteed to be consistent.

[0016] The rock drill teeth on the spiral groove ridge form cutting drill teeth that are convenient for drilling. The evenly distributed rock drill teeth bear roughly equal rock breaking area, which can ensure that each tooth is evenly stressed during rock breaking. When the drill bit is fed, the rock drill teeth from the beginning to the end break the rock and expand the hole in turn, avoiding premature damage of the rock drill teeth due to uneven stress during drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a schematic cross-sectional view of the overall structure of the utility model;

[0019] Figure 3It is a structural schematic diagram of the drill head of the utility model. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0021] like Figure 1-Figure 3 A spiral self-coring reamer for geological drilling comprises a drill body 1 having a conical structure. The drill body 1 is provided with a spiral groove 2 on its surface. Rock drilling teeth 3 are evenly distributed along the spiral direction of the groove ridges of the spiral groove 2. A platform 5 is provided at the head of the drill body 1. A positioning core 4 is provided at the center of the head of the drill body 1. Shear blades 6 are evenly distributed on the platform 5. A connecting end 9 is provided at the rear of the drill body 1.

[0022] When in use, the connecting end 9 of the spiral self-centering reamer is connected to the drilling rig. After the spiral self-centering reamer is aligned with the hole to be reamed, the positioning core 4 is first placed in the reamed hole. The positioning core 4 is used to play a positioning and guiding role in the hole to be reamed. When the reamer is rotated and fed, the shearing blade 6 performs preliminary reaming to slightly expand the diameter of the reamed hole. Because the preliminary reaming is a small-amplitude reaming, it can cope with harder rocks. Subsequent reaming relies on the rock drilling teeth 3 uniformly distributed along the spiral direction of the groove ridges of the spiral groove 2. The rock drilling teeth 3 cooperate with the shearing blade to cope with harder geological rocks. When the drill bit is fed, the rock drilling teeth 3 from the beginning to the end break the rock and expand the hole in turn. The spiral groove 2 on the surface of the drill body is conducive to smooth powder discharge to avoid drill jamming.

[0023] The platform 5 is provided with an exhaust hole 7 near the root of the positioning core, and a main air hole 8 is provided at the center of the drill body 1. The main air hole 8 runs through the rear end of the drill body 1, and the exhaust hole 7 is connected to the main air hole 8. The main air hole 8 is used to pass high-pressure gas and then transport it to the exhaust hole 7, which has the function of cooling the drill bit and removing powder and slag.

[0024] The angle between the hypotenuse of the axial section of the drill body 11 and the axial direction is 10°-20°.

[0025] The cross section of the spiral groove 2 is an arc-shaped structure, which is conducive to powder discharge and avoids excessive powder residue.

[0026] The spiral groove 2 is inclined at 8°-12°, which is also conducive to powder discharge, which is equivalent to the principle of auger conveying.

[0027] The rock drill bit 3 is a bullet-shaped structure and is welded in a blind hole on the end face of the alloy ridge. The elastic structure means bullet-shaped.

[0028] The shear blades 6 are evenly distributed in an even number of 6 to 18 and are arranged according to the specifications of the actual reamer.

[0029] The connecting end 9 is provided with a rectangular left-hand thread with a pitch of 15.63 mm.

[0030] The above are only preferred embodiments of the present invention.

Claims

1. A geological drilling spiral self-coring reamer, characterized in that: The drill body (1) comprises a drill body (1) having a conical structure, a spiral groove (2) being provided on the surface of the drill body (1), rock drilling teeth (3) being evenly distributed along the spiral direction on the groove ridge of the spiral groove (2), a platform (5) being provided at the head of the drill body (1), a positioning core (4) being provided at the center of the head of the drill body (1), shear blades (6) being evenly distributed on the platform (5), and a connecting end (9) being provided at the tail of the drill body (1).

2. A geological drilling spiral self-coring reamer according to claim 1, characterized in that: An exhaust hole (7) is provided on the platform (5) at a position close to the root of the positioning core, and a main air hole (8) is provided at the center position inside the drill body (1). The main air hole (8) passes through the tail of the drill body (1), and the exhaust hole (7) is connected to the main air hole (8).

3. The geological drilling spiral self-coring reamer according to claim 1, characterized in that: The angle between the hypotenuse of the axial section of the drill body (1) and the axial direction is 10°-20°.

4. The geological drilling spiral self-coring reamer according to claim 1, characterized in that: The cross section of the spiral groove (2) is an arc-shaped structure.

5. The geological drilling spiral self-coring reamer according to claim 1, characterized in that: The spiral groove (2) is inclined at 8°-12°.

6. The geological drilling spiral self-coring reamer according to claim 1, characterized in that: The rock drill teeth (3) are of elastic structure and are welded in a blind hole on the end face of the alloy ridge.

7. The geological drilling spiral self-coring reamer according to claim 1, characterized in that: The shear blades (6) are evenly distributed in an even number of 6 to 18 pieces.

8. The geological drilling spiral self-coring reamer according to claim 1, characterized in that: The connecting end (9) is provided with a rectangular left-hand thread with a pitch of 15.63 mm.

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