Rated tension directional drill bit for detecting soft coal seam

Abstract

The utility model relates to the field of drilling equipment for soft coal seams, in particular to a rated tension directional drill bit for detecting the soft coal seams, which comprises a drill bit blank and a tail drill, and the head of the drill bit blank is provided with three cutting edges, namely an annular edge, an outer edge edge and a tooth-shaped edge. The annular blade is arranged at the top of the drill bit blank body and comprises an inner annular blade and an outer annular blade, diamond sheets are arranged on cutting edge structures of the inner annular blade and the outer annular blade, an outer edge blade is arranged below the annular blade, a tooth-shaped blade is arranged below the outer edge blade, and sawtooth diamond sheets are arranged on a cutting edge structure of the tooth-shaped blade. A mounting connecting structure is arranged on the lower half part of the drill bit blank body, is inserted into the tail drill and is fixed by a bolt, hollow screws are arranged in the drill bit blank body and the tail drill and are fastened and connected by the hollow screws, a wave spring is further sleeved on the hollow screws and has certain elastic connection, and a sealing ring is further arranged at the connecting part of the drill bit blank body and the tail drill and is connected with the tail drill by a sealing ring. And the waterproof effect is effectively achieved.

Description

Technical Field

[0001] The utility model relates to the field of drilling equipment for soft coal seams, in particular to a rated tension directional drill bit for detecting soft coal seams. Background Art

[0002] In the process of coal mining, there are principles of "forecasting and prediction, exploration before digging, exploration before digging, and exploration before mining" to ensure the installation and production of coal mines.

[0003] In the field of drilling soft coal seams, especially those prone to collapse, directional drilling is used to pre-detect water or gas ahead. Directional drilling is a drilling technology that can change the drilling trajectory according to actual needs and design requirements during the drilling process. The drilling axis can be connected by continuously adjusting the drill bit at a certain angle.

[0004] When a directional drill is used to drill soft coal seams to detect water or gas ahead, the soft coal seams are prone to collapse, which can press the cable drill rod, the drilling measurement rod, the drilling motor rod, etc., and prevent them from moving forward. Since the drill bit is connected to the drilling motor rod and the drill bit diameter is larger than the drilling motor diameter, it is impossible to withdraw from the drilled hole after the drilling is pressed, making repair and maintenance difficult and costly. Summary of the invention

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a rated tension directional drill bit for detecting soft coal seams, which can work under the rated tension and can be disassembled and separated from the drilling motor rod connected to the drill bit after exceeding the rated tension.

[0006] The technical solution adopted by the utility model is:

[0007] A rated pulling force directional drill bit for detecting soft coal seams comprises a drill body and a tail drill, and the drill body and the tail drill are inserted and arranged. The drill body is a cylindrical cavity structure, comprising a cutting edge structure and a mounting connection structure, wherein the cutting edge structure is arranged at the upper part of the drill body, and the mounting connection structure is arranged at the lower part of the drill body; the cutting edge structure comprises an annular blade, an outer edge blade, and a toothed blade; the annular blade is arranged at the top of the drill body, and below the annular blade, the outer circle of the drill body is provided with a protruding outer edge blade, and the outer edge blade is arranged vertically; below the outer edge blade is a toothed blade. The mounting connection structure comprises an inserting claw.

[0008] The tail drill is a cylindrical cavity structure, an inserting groove is arranged in the circumferential direction of the outer circle of the upper cylinder, the inserting groove is matched with the inserting claw, and a connecting stud is arranged at the lower end of the tail drill.

[0009] A hollow screw is provided through the drill bit embryo and the inner cavity of the tail drill. The head of the hollow screw passes through the inner cavity of the tail drill and is screwed and connected with the drill bit embryo.

[0010] A protective cover is provided at the insertion interface between the drill bit embryo and the outer edge of the tail drill.

[0011] The annular blade includes an inner annular blade and an outer annular blade. The inner annular blade includes a first inclined body and a diamond sheet. The first inclined body is arranged in an orderly manner along the circumferential direction of the central axis of the drill bit blank. The first inclined body forms an inclination angle A with the horizontal end face. The head of the first inclined body is provided with a first cutting edge mounting groove. The first cutting edge mounting groove is provided with a diamond sheet. The outer annular blade includes a second inclined body and a diamond sheet. The second inclined body is arranged outside the first inclined body. The second inclined body is arranged in an orderly manner along the circumferential direction of the central axis of the drill bit blank. The second inclined body forms an inclination angle A with the horizontal end face. The head of the second inclined body is provided with a third cutting edge mounting groove. The third cutting edge mounting groove is provided with a diamond sheet.

[0012] The toothed blade comprises a sawtooth diamond piece, the outer wall of the drill bit blank is provided with a second cutting edge mounting groove, and the sawtooth diamond piece is arranged in the second cutting edge mounting groove.

[0013] A U-shaped connecting hole is arranged at the bottom of the inserting claw, a fastening screw hole is arranged in the inserting groove, and the fastening screw hole is arranged to match the U-shaped connecting hole.

[0014] The winding directions of the inner and outer ring blades are consistent, and the range of the inclination angle A between the first inclined body, the second inclined body and the horizontal end face is: 10°~30°.

[0015] Beneficial effects of the utility model:

[0016] The utility model discloses a rated tension directional drill bit for detecting soft coal seams, comprising a drill bit body and a tail drill. The head of the drill bit body is provided with three cutting edges, namely, an annular blade, an outer edge blade and a serrated blade, so as to effectively carry out drilling work. The lower part is provided with an installation connection structure, which is inserted with the tail drill and fixed with bolts. Hollow screws are provided inside the drill bit body and the tail drill, and are fastened with the hollow screws. A wave spring is also sleeved on the hollow screw to have a certain elastic connection. A sealing ring is also provided at the connection part of the drill bit body and the tail drill to effectively achieve a waterproof effect. When the rated tension is exceeded, the threaded connection of the hollow screw between the drill bit body and the tail drill fails, and the drilling motor rod connected thereto is disintegrated and separated. The drill bit can be replaced again, the drilling trajectory can be changed, and the work can be continued. The repair and maintenance are simple, the maintenance cost is reduced, and the maintenance man-hours are saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the following specifically cites preferred embodiments and cooperates with the attached drawings, but the embodiments in the drawings do not constitute any limitation of the present invention. For ordinary technicians in this field, other drawings can be obtained according to the following drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure;

[0020] Figure 3 This is a schematic diagram of the drill bit embryo structure;

[0021] Figure 4 This is a schematic diagram of the top structure of the drill bit embryo;

[0022] Figure 5 It is a schematic diagram of the angle of the inclined body;

[0023] Figure 6 This is a schematic diagram of the tail drill structure;

[0024] Figure 7 This is a schematic diagram of the drill bit embryo and tail drill installation structure;

[0025] Figure 8 Schematic diagram of the hollow screw structure.

[0026] In the figure: 1-drill bit blank, 101-first cutting edge mounting groove, 102-threaded hole, 103-second cutting edge mounting groove, 104-second sealing ring mounting groove, 105-insertion claw, 106-U-shaped connecting hole, 107-outer edge edge, 108-first inclined body, 109-second inclined body, 110-third cutting edge mounting groove, 2-tail drill, 201-circular through hole, 202-insertion groove, 203-fastening screw hole, 204-connecting stud, 205-first sealing ring mounting groove, 3-wave spring, 4-hollow screw, 401-screw, 402-cylinder, 403-circular ring stage, 404-hexagonal hole, 5-shield, 6-fastening screw, 7-first sealing ring, 8-second sealing ring, 9-diamond sheet, 10-serrated diamond sheet. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0028] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings attached to this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0029] like Figure 1 , Figure 2As shown, a rated tension directional drill bit for detecting soft coal seams includes a drill body 1, a tail drill 2, a hollow screw 4, and a protective cover 5. The drill body 1 and the tail drill 2 are inserted and arranged, and the protective cover 5 is sleeved at the insertion interface of the drill body 1 and the outer edge of the tail drill 2. The hollow screw 4 is screwed and arranged in the inner cavity of the drill body 1 and the tail drill 2. A seal is arranged between the insertion contact surface of the drill body 1 and the tail drill 2, and between the drill body 1 and the protective cover 5 to prevent water penetration.

[0030] like Figure 3 , Figure 4 As shown, the drill body 1 is a cylindrical cavity structure, including a cutting edge structure and a mounting connection structure. The cutting edge structure is arranged at the upper part of the drill body 1, and the mounting connection structure is arranged at the lower part of the drill body 1. The cutting edge structure includes an annular cutting edge, an outer edge cutting edge 107, and a toothed cutting edge. The annular cutting edge is arranged at the top of the drill body 1, including an inner annular cutting edge and an outer annular cutting edge. The inner annular cutting edge includes a first inclined body 108 and a diamond sheet 9. The first inclined body 108 is arranged in an orderly manner along the circumferential direction of the central axis of the drill body 1. The first inclined body 108 forms a certain inclination angle A with the horizontal end face. The head of the first inclined body 108 is provided with a first cutting edge mounting groove 101, as shown in FIG. Figure 1 As shown, a diamond sheet 9 is arranged in the first cutting edge mounting groove 101, and the diamond sheet 9 is a cylindrical sheet structure. The outer ring blade includes a second inclined body 109 and a diamond sheet 9. The second inclined body 109 is arranged outside the first inclined body 108. The second inclined body 109 is arranged in an orderly manner along the circumferential direction of the central axis of the drill bit blank 1. The second inclined body 109 forms a certain inclination angle A with the horizontal end face. The head of the second inclined body 109 is provided with a third cutting edge mounting groove 110, and the diamond sheet 9 is arranged in the third cutting edge mounting groove 110. The winding direction of the inner ring blade and the outer ring blade is consistent, and the inclination angle A of the first inclined body 108 and the second inclined body 109 with the horizontal end face is the same, as shown in FIG. Figure 5 As shown, the range of the inclination angle A is 10° to 30°. Below the annular blade, the outer circle of the drill bit body 1 is provided with a protruding outer edge edge 107, and the outer edge edge 107 is arranged vertically. Below the outer edge edge 107, a toothed blade is arranged, and the toothed blade includes a sawtooth diamond piece 10. The outer wall of the drill bit body 1 is provided with a second edge mounting groove 103, and the sawtooth diamond piece 10 is arranged in the second edge mounting groove 103.

[0031] like Figure 3 As shown, a mounting connection structure is provided at the lower half of the drill bit embryo 1 , and the mounting connection structure includes an inserting claw 105 , and a U-shaped connecting hole 106 is provided at the bottom of the inserting claw 105 .

[0032] like Figure 3 As shown, the drill bit body 1 is provided with a stepped circular hole along the central axis, the lower circular hole is a circular through hole for connecting the tail drill 2, and the upper circular hole is provided with a threaded hole 102 for screwing the hollow screw 4. The outer circle of the drill bit body 1 is also provided with a second sealing ring installation groove 104, as shown in FIG. Figure 2 As shown, the second sealing ring 8 is arranged in the second sealing ring installation groove 104. The second sealing ring 8 is arranged between the contact surface of the drill bit embryo 1 and the shield 5.

[0033] In this embodiment, four groups of insertion claws 105 are provided.

[0034] In this embodiment, three groups of inner ring cutting edges are provided, and five groups of outer ring cutting edges are provided. In practical applications, the number of the groups can be appropriately increased or decreased.

[0035] In this embodiment, the inclination direction of the first inclined body 108 and the second inclined body 109 in the inner ring cutting edge group and the outer ring cutting edge group is arranged counterclockwise, and in actual applications, they can also be arranged clockwise according to actual applications.

[0036] like Figure 6 As shown, the tail drill 2 is a cylindrical cavity structure, and an insertion groove 202 is arranged in the outer circumference of the upper end cylinder, and the insertion groove 202 is matched with the insertion claw 105; a fastening screw hole 203 is arranged in the insertion groove 202, and the fastening screw hole 203 is matched with the U-shaped connection hole 106. A connecting stud 204 is arranged at the lower end of the tail drill 2 for connecting the drill rod. A circular through hole 201 is also arranged at the central axis of the tail drill 2 for setting the hollow screw 4. A first sealing ring installation groove 205 is also arranged on the top end surface of the upper end cylinder for setting the first sealing ring 7.

[0037] like Figure 2 , Figure 7 As shown, the insertion claw 105 at the lower end of the drill bit body 1 is inserted and installed in the insertion groove 202 at the upper end of the tail drill 2, and the U-shaped connection hole 106 corresponds to the fastening screw hole 203 one by one, and is fastened with bolts.

[0038] like Figure 2 , Figure 8 As shown, the hollow screw 4 includes a screw rod 401, and the screw rod 401 matches the threaded hole 102 set on the drill bit blank 1. A cylinder 402 is set below the screw rod 401, and the cylinder 402 matches the circular through hole 201 set on the tail drill 2. A circular ring platform 403 is formed at the connection between the cylinder 402 and the screw rod 401, and the circular ring platform 403 is used to support the wave spring 3 sleeved on the screw rod 401. The hollow screw 4 is provided with a circular through hole along the center of the axis for passing water and air. A hexagonal hole 404 of a certain depth is also provided at the end of the circular through hole. The hexagonal hole 404 is located at the cylinder 402, and the hexagonal hole 404 is used for a wrench to tighten the hollow screw 4. As shown Figure 2 As shown, the wave spring 3 is sleeved on the screw rod 401, the hollow screw 4 is inserted into the inner cavity of the tail drill 2 and the drill body 1, the cylinder 402 is matched with the circular through hole 201 in the tail drill 2, and the screw rod 401 is screwed and connected with the threaded hole 102 set on the drill body 1.

[0039] like Figure 2 As shown, the assembly structure of the drill bit is as follows: the first sealing ring 7 is set in the first sealing ring installation groove 205 at the top of the tail drill 2, the insertion claw 105 of the drill bit body 1 is inserted into the insertion groove 202 of the tail drill 2, and is screwed and connected with the fastening screw 6. The wave spring 3 is sleeved on the screw 401 of the hollow screw 4, the hollow screw 4 is inserted into the inner cavity of the tail drill 2 and the drill bit body 1, the cylinder 402 is matched with the circular through hole 201 in the tail drill 2, and the screw 401 is screwed and connected with the threaded hole 102 set on the drill bit body 1. The second sealing ring 8 is sleeved on the second sealing ring installation groove 104 of the drill bit body 1, and the shield 5 is sleeved on the outer circumferential surface of the drill bit body 1 and the tail drill 2. The diamond piece 9 is set in the first cutting edge installation groove 101 and the third cutting edge installation groove 110, and the sawtooth diamond piece 10 is set in the second cutting edge installation groove 103.

[0040] like Figure 1 , Figure 2 As shown, during drilling, the drill bit drills in the coal seam according to the set trajectory, and the drill bit rotates, and the annular blade, outer edge blade 107, and toothed blade set on the drill bit body 1 cooperate to drill forward. When the coal seam collapses and presses the drill bit, the drill rod retreats and starts to retreat from the drilled channel. The tail drill 2 is subjected to backward tension. When the tension reaches the rated value, the threaded connection part between the hollow screw 4 and the drill bit body 1 is damaged under the over-rated tension, and the tail drill 2 is forcibly detached from the drill bit body 1. Important components such as the cable drill rod, the drilling measurement rod, and the drilling motor rod in the drill rod can be pulled out of the hole, and the drill bit can be replaced, and the drilling trajectory can be changed before drilling again.

Claims

1. A rated tension directional drill bit for detecting soft coal seams, comprising a drill bit embryo (1) and a tail drill (2), wherein the drill bit embryo (1) and the tail drill (2) are inserted and arranged, and characterized in that: The drill bit body (1) is a cylindrical cavity structure, comprising a cutting edge structure and a mounting connection structure, wherein the cutting edge structure is arranged at the upper part of the drill bit body (1), and the mounting connection structure is arranged at the lower part of the drill bit body (1); the cutting edge structure comprises an annular cutting edge, an outer edge cutting edge (107), and a toothed cutting edge; the annular cutting edge is arranged at the top of the drill bit body (1), and below the annular cutting edge, the outer circle of the drill bit body (1) is provided with a protruding outer edge cutting edge (107), and the outer edge cutting edge (107) is arranged vertically; and a toothed cutting edge is arranged below the outer edge cutting edge (107); The installation connection structure comprises an insertion claw (105); The tail drill (2) is a cylindrical cavity structure, an insertion groove (202) is arranged in the circumferential direction of the outer circle of the upper cylinder, the insertion groove (202) is arranged to match the insertion claw (105), and a connecting stud (204) is arranged at the lower end of the tail drill (2); A hollow screw (4) is provided through the inner cavity of the drill bit embryo (1) and the tail drill (2); the head of the hollow screw (4) passes through the inner cavity of the tail drill (2) and is screwed to the drill bit embryo (1); A protective cover (5) is sleeved on the outer edge insertion interface between the drill bit embryo (1) and the tail drill (2).

2. A rated tension directional drill bit for detecting soft coal seams according to claim 1, characterized in that: The annular blade comprises an inner annular blade and an outer annular blade, the inner annular blade comprises a first inclined body (108) and a diamond plate (9), the first inclined body (108) being arranged in an orderly manner along the circumferential direction of the central axis of the drill bit embryo (1), the first inclined body (108) forming an inclined angle A with a horizontal end face, the head of the first inclined body (108) being provided with a first cutting edge mounting groove (101), the first cutting edge mounting groove (101) being provided with a diamond plate (9), the outer annular blade comprises a second inclined body (109) and a diamond plate (9), the second inclined body (109) being arranged outside the first inclined body (108), the second inclined body (109) being arranged in an orderly manner along the circumferential direction of the central axis of the drill bit embryo (1), the second inclined body (109) forming an inclined angle A with the horizontal end face, the head of the second inclined body (109) being provided with a third cutting edge mounting groove (110), the third cutting edge mounting groove (110) being provided with a diamond plate (9).

3. The rated tension directional drill bit for detecting soft coal seams according to claim 1, characterized in that: The toothed blade comprises a sawtooth diamond piece (10); the outer wall of the drill bit blank (1) is provided with a second cutting edge mounting groove (103); and the sawtooth diamond piece (10) is arranged in the second cutting edge mounting groove (103).

4. The rated tension directional drill bit for detecting soft coal seams according to claim 1, characterized in that: A U-shaped connection hole (106) is provided at the bottom of the insertion claw (105), a fastening screw hole (203) is provided in the insertion slot (202), and the fastening screw hole (203) is matched with the U-shaped connection hole (106).

5. The rated tension directional drill bit for detecting soft coal seams according to claim 2, characterized in that: The inner annular blade and the outer annular blade have the same winding direction, and the range of the inclination angle A between the first inclined body (108) and the second inclined body (109) and the horizontal end surface is 10° to 30°.

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