Drill bit for geological exploration

Abstract

The utility model discloses a drill bit for geological exploration. The drill bit comprises a cutting head, a first drill rod, a second drill rod, a reaming cutter, a reaming top block, a hydraulic push rod and a second connecting screw rod, the cutting head, the first drill rod and the second drill rod are locked and connected through a second connecting screw rod; a tubular part is arranged at the joint of the first drill rod and the second drill rod, and the reaming cutter is coupled to the side wall of the tubular part; a top block sliding cavity is formed in the middle axis of the tubular component; the reaming jacking block is sleeved with the jacking block sliding cavity, and polycrystalline diamond drill bits are arranged on the cutting head, the outer wall of the first drill rod and the outer end edge of the reaming cutter. The reaming top block is sleeved in the top block sliding cavity, and the hydraulic push rod pushes the reaming top block to slide in the top block sliding cavity; and the chambering top block drives the chambering knife to extend out or retract from the blade sliding groove. The blade sliding groove restrains the reaming cutter, so that the polycrystalline diamond drill bit on the reaming cutter can bear larger cutting force on the rock stratum working face.

Description

TECHNICAL FIELD

[0001] The utility model belongs to geological exploration equipment accessory technical field, concretely relates to a drill bit for geological exploration. BACKGROUND

[0002] Geological exploration is mainly carried out to the hard shell layer under the ground surface, and the exploration equipment is used during exploration, a PDC drill bit is installed at the front end of the explorer, and the PDC drill bit drilling operation is to use the cutting teeth to generate shear stress on the stratum to make the rock plastic deformation and fracture and carry out the rock debris from the wellbore.

[0003] The near horizontal directional drilling is horizontal mining detection, and the rock is broken by high-speed rotation of the drill bit; the stress of the near horizontal directional drilling is large, and the drill bit is easily bent and fractured during rigid cutting machining process, the main operating components of the drill bit are fixed and installed by threads, deformation is generated in high-speed rotation, and then the cutting outer diameter is changed, which affects the demand of the near horizontal directional drilling. SUMMARY

[0004] The drill bit for geological exploration is provided to solve the above problems.

[0005] A drill bit for geological exploration, it includes: cutting head, first drill rod, first connecting screw rod, second drill rod, reamer, reamer top block, hydraulic push rod, second connecting screw rod;The cutting head is provided with spiral blades, the central axis of the cutting head and the first drill rod is connected by the first connecting screw rod;The connecting place of the first drill rod and the second drill rod is a tubular part, and the central axis of the tubular part is provided with a top block sliding cavity;The hydraulic push rod is sleeved in the second drill rod;The tubular part is provided with blade sliding grooves on the wall, and the reamer is arranged in the blade sliding groove;The cutting head, the outer wall of the first drill rod and the outer end of the reamer are all provided with polycrystalline diamond drill bits;The cutting head, the first drill rod and the second drill rod are connected by the second connecting screw rod;The reamer top block is sleeved in the top block sliding cavity, and the hydraulic push rod pushes the reamer top block to slide in the top block sliding cavity;The reamer top block drives the reamer to extend or retract from the blade sliding groove.

[0006] The polycrystalline diamond drill bit is divided into first polycrystalline diamond drill bit, second polycrystalline diamond drill bit and third polycrystalline diamond drill bit.

[0007] The five-petal spiral blade on the cutting head is provided with the first polycrystalline diamond drill bit on the top and each spiral blade, and the outer end of each spiral blade is a cutting spiral along the cutting curve;The outer wall of the first drill rod is provided with five groups of second polycrystalline diamond drill bits;The reamer is provided with five groups, and each reamer is provided with a third polycrystalline diamond drill bit on the outer end face;The five groups of second polycrystalline diamond drill bits and the five groups of third polycrystalline diamond drill bits are respectively on the five cutting spirals.

[0008] The lower end surface of the cutting head is provided with a positioning counterbore at the center of the axis; the center of the axis of the positioning counterbore is provided with a cutting head center threaded hole; the top end surface of the first drill rod is provided with a positioning flange, which can be sleeved in the positioning counterbore; the positioning flange is provided with a center screw through hole, which coincides with the axis of the cutting head center threaded hole; one end of the first connecting screw rod is sleeved in the center screw through hole, and the end of the first connecting screw rod is threadedly locked in the cutting head center threaded hole.

[0009] The lower end surface of the cutting head is provided with five connecting threaded holes, and the pipe wall of the first drill rod is provided with five first connecting screw through holes; the pipe wall of the lower tubular part of the second drill rod is provided with five second connecting screw through holes; the upper end of the second drill rod is the lower tubular part, the first connecting screw through hole, the second connecting screw through hole and the connecting threaded hole are in corresponding positions; five second connecting screws are provided, and the five second connecting screws are respectively threaded through the second connecting screw through hole and the first connecting screw through hole and then are threadedly connected with the connecting threaded hole; the axis of the five second connecting screws is parallel to the axis of the first drill rod.

[0010] The inside of the first drill rod is provided with an upper sliding block cavity, and the lower tubular part is provided with a lower sliding block cavity; the upper sliding block cavity and the lower sliding block cavity are connected to form a top block sliding cavity.

[0011] The lower end surface of the first drill rod is provided with five groups of upper blade sliding grooves, and the upper blade sliding grooves are provided with upper blade shaft counterbores; the pipe wall of the lower tubular part of the second drill rod is provided with five lower blade sliding grooves, and the upper end of each lower blade sliding groove is provided with a lower blade shaft counterbore; the lower blade sliding groove can be connected to the upper blade sliding groove to form a blade sliding groove; and the lower blade shaft counterbore can be connected to the upper blade shaft counterbore to form a blade shaft sleeve.

[0012] The reaming cutter comprises a reaming cutter holder and a cutter holder shaft; the reaming cutter holder can be embedded in the blade sliding groove; the upper end of the reaming cutter holder is provided with a shaft through hole, and one side of the shaft through hole is provided with a pushing flange.

[0013] The reaming top block is a Laval nozzle-shaped part, and the pushing flange can slide along the outer wall of the reaming top block.

[0014] The drilling diameters of the first and second polycrystalline diamond drill bits are about 150-160 mm; and the reaming range of the third polycrystalline diamond drill bit is 150-200 mm.

[0015] The technical scheme provides a drill bit for geological exploration, which comprises a cutting head, a first drill rod, a second drill rod, a reamer, a reamer top block, a hydraulic push rod and a second connecting screw rod. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a whole schematic view of the drill bit for geological exploration;

[0017] Figure 2 is a component composition schematic view of the drill bit for geological exploration;

[0018] Figure 3 is a connection schematic view of the cutting head and the first drill rod of the drill bit for geological exploration;

[0019] Figure 4 is a second drill rod internal structure schematic view of the drill bit for geological exploration;

[0020] Figure 5 is a second drill rod local sectional view of the drill bit for geological exploration;

[0021] Figure 6 is a first drill rod and second drill rod structure connection schematic view of the drill bit for geological exploration;

[0022] Figure 7 is a reamer structure schematic view of the drill bit for geological exploration;

[0023] In the figure: 1, cutting head, 11, first polycrystalline diamond drill bit, 12, positioning counterbore, 13, cutting head center threaded hole, 14, connecting threaded hole, 2, first drill rod, 21, positioning flange, 22, upper sliding cavity of sliding block, 23, center threaded hole of screw rod, 24, first connecting threaded hole of screw rod, 25, second polycrystalline diamond drill bit, 26, sliding groove of upper blade, 27, lower blade shaft rod counterbore, 3, first connecting screw rod, 31, first nut, 32, first optical axis screw rod, 33, gasket, 34, first threaded rod, 4, second drill rod, 41, lower tubular part, 411, lower sliding cavity of sliding block, 42, threaded connection locking pipe, 421, hydraulic rod fixing cavity, 43, hydraulic pipe bundle through hole, 44, second connecting threaded hole of screw rod, 46, sliding groove of lower blade, 47, lower blade shaft rod counterbore, 5, reaming cutter, 51, reaming cutter holder, 52, third polycrystalline diamond drill bit, 512, pushing flange, 5121, upper arc flange of pushing, 5122, lower arc flange of pushing, 53, cutter holder shaft rod, 6, reaming top block, 7, hydraulic push rod, 71, telescopic rod, 8, second connecting screw rod. DETAILED DESCRIPTION

[0024] The technical solutions will be further described in detail below with reference to the accompanying drawings of the technical solutions. The described embodiments are only a part of the technical solutions, and not all the embodiments. Based on the technical solutions, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0025] Embodiment 1

[0026] Referring to Figures 1 to 7 As shown in the figure, a drill bit for geological exploration comprises a cutting head 1, a first drill rod 2, a first connecting screw rod 3, a second drill rod 4, a reaming cutter 5, a reaming top block 6, a hydraulic push rod 7, and a second connecting screw rod 8.

[0027] The cutting head 1 is a five-petal rose drill bit, and the diameter of the cutting head 1 is about 150 mm. Each petal drill bit blade and the top of the cutting head 1 is provided with a first polycrystalline diamond drill bit 11. The cutting head 1 is provided with a positioning counterbore 12 at the axial center of the lower end surface, and the positioning counterbore 12 is a hexagonal counterbore. The cutting head 1 is provided with a cutting head center threaded hole 13 at the axial center of the positioning counterbore 12. The cutting head 1 is also provided with a plurality of connecting threaded holes 14 at the edge of the lower end surface, and the axial lines of the plurality of connecting threaded holes 14 are parallel to the axial line of the cutting head 1.

[0028] The first drill rod 2 is an upper tubular part, and the diameter of the first drill rod 2 is 145-150 mm. The wall thickness of the first drill rod 2 is about 30 mm.

[0029] The top end face of the first drill rod 2 is provided with a positioning flange 21, the positioning flange 21 is hexagonal, and the positioning flange 21 can be sleeved in the positioning counterbore 12; the positioning counterbore 12 and the positioning flange 21 are in transition fit;

[0030] The inside of the first drill rod 2 is provided with a sliding block upper sliding cavity 22; the sliding block upper sliding cavity 22 is provided with a center screw through hole 23 penetrating to the top; a first connecting screw through hole 24 corresponds to the connecting threaded hole 14; the first drill rod 2 is provided with a plurality of first connecting screw through holes 24 on the pipe wall; the axial lines of the plurality of first connecting screw through holes 24 are parallel to the axial line of the first drill rod 2; the first connecting screw through hole 24 and the connecting threaded hole 14 are provided in the same number; the upper part of the first drill rod 2 is provided with a second polycrystalline diamond drill bit 25;

[0031] The lower end face of the first drill rod 2 is provided with five sets of upper blade sliding grooves 26, and the upper blade sliding grooves 26 are provided with upper blade shaft counterbores 27; the diameter of the upper blade shaft counterbores 27 is smaller than the thickness of the pipe wall of the first drill rod 2, and the axial line of the upper blade shaft counterbores 27 is tangent to the center line of the pipe wall of the first drill rod 2;

[0032] The first connecting screw 3 is provided with a first nut 31 at one end and a first optical axis screw 32 at the other end, the first optical axis screw 32 is sleeved with a gasket 33; the first connecting screw 3 is sleeved in the center screw through hole 23; the first connecting screw 3 is provided with a first threaded rod 34 at the end, and the first threaded rod 34 is sleeved in the cutting head center threaded hole 13; that is, the first drill rod 2 and the cutting head 1 are threadedly locked and connected through the first connecting screw 3.

[0033] The upper end of the second drill rod 4 is a lower tubular part 41, the diameter of the lower tubular part 41 is 145-150 mm, and the thickness of the pipe wall of the lower tubular part 41 is about 30 mm; the lower tubular part 41 is provided with a sliding block lower sliding cavity 411; the lower end of the second drill rod 4 is a threaded connection locking pipe 42, and the inside of the threaded connection locking pipe 42 is provided with a hydraulic rod fixing cavity 421; the hydraulic rod fixing cavity 421 is provided with a plurality of hydraulic pipe bundle through holes 43 at the bottom;

[0034] The pipe wall of the lower tubular part 41 of the second drill rod is provided with a plurality of second connecting screw through holes 44 and lower blade sliding grooves 46; the lower end of the second connecting screw through hole 44 is a nut counterbore; the number of the second connecting screw through hole 44 is the same as that of the first connecting screw through hole 24; the first connecting screw through hole 24 and the second connecting screw through hole 44 correspond in position;

[0035] The upper part of the lower blade sliding groove 46 is a vertical sliding groove, and the lower part of the lower blade sliding groove 46 is an inclined sliding groove, that is, the lower blade sliding groove 46 is an L-shaped or arc-shaped sliding groove;

[0036] The upper end of the lower blade sliding groove 46 is provided with a lower blade shaft hole 47; the lower blade sliding groove 46 can be connected with the upper blade sliding groove 26 to form a blade sliding groove; the lower blade shaft hole 47 can be connected with the upper blade shaft hole 27 to form a blade shaft sleeve; the blade sliding groove is provided with five groups, and the five groups of blade sliding grooves are arranged in an annular array on the upper end of the second drill rod 4; the upper end of each blade sliding groove is provided with a blade shaft sleeve.

[0037] The reaming cutter 5 is provided with five groups, and the five groups of reaming cutters 5 are arranged in an annular array; the five groups of reaming cutters 5 are the same in structure;

[0038] The reaming cutter 5 comprises a reaming cutter holder 51, a third polycrystalline diamond drill bit 52, and a cutter holder shaft 53.

[0039] The reaming cutter holder 51 is L-shaped or arc-shaped, and can be embedded into the blade sliding groove; the upper end of the reaming cutter holder 51 is provided with a shaft hole 511, one side of the shaft hole 511 is provided with a pushing flange 512; the upper end of the pushing flange 512 is provided with a pushing upper arc flange 5121, and the lower end of the pushing flange 512 is provided with a pushing lower arc flange 5122; the pushing upper arc flange 5121 and the pushing lower arc flange 5122 form a B-shaped pushing flange 512.

[0040] The cutter holder shaft 53 is sleeved in the shaft hole 511; the cutter holder shaft 53 is sleeved in the blade shaft sleeve at both ends; the outer end surface of the reaming cutter holder 51 is provided with a plurality of third polycrystalline diamond drill bits 52.

[0041] The reaming top block 6 is a Laval nozzle-shaped part, and the outer end surface of the reaming top block 6 is a hollow pipe that gradually narrows and widens;

[0042] The upper sliding cavity 22 and the lower sliding cavity 411 of the sliding block are connected to form a top block sliding cavity, the axis of the top block sliding cavity coincides with the central axis of the first drill rod 2 and the second drill rod 4; the reaming top block 6 is sleeved in the top block sliding cavity; the rod body of the hydraulic push rod 7 is sleeved in the hydraulic rod fixing cavity 421; the upper end of the hydraulic push rod 7 is provided with an extension rod 71, and the reaming top block 6 is fixed on the upper end of the extension rod 71 through a sliding block connecting bolt 72;

[0043] The outer end surface of the reaming top block 6 supports the five pushing flanges 512; when the reaming top block 6 moves upward, the gradually widening arc surface at the lower end of the reaming top block 6 abuts against the pushing lower arc flange 5122, the pushing lower arc flange 5122 slides along the gradually widening arc surface, and the reaming cutter holder 51 extends out of the blade sliding groove; when the reaming top block 6 moves downward, the gradually narrowing arc surface at the upper end of the reaming top block 6 abuts against the pushing upper arc flange 5121, the pushing upper arc flange 5121 slides along the gradually narrowing arc surface, and the reaming cutter holder 51 is retracted into the blade sliding groove.

[0044] The second connecting screw 8 is an internal hexagonal bolt, and the nut of the second connecting screw 8 can be sleeved in the nut counterbore at the lower end of the second connecting screw through hole 44; the second connecting screw 8 is sequentially threaded through the second connecting screw through hole 44 and the first connecting screw through hole 24 and then is screwed with the connecting screw hole 14;

[0045] The second connecting screw 8 is provided in plurality, and the plurality of second connecting screws 8 are of the same structure; that is, the cutting head 1, the first drill rod 2 and the second drill rod 4 are locked and connected by the plurality of second connecting screws 8.

[0046] The five-petal cutter holder of the cutting head 1 is a spiral blade, the second PCD drill bit 25 is provided in five groups, and the third PCD drill bit 52 is provided in five groups.

[0047] The five-petal spiral blade on the cutting head 1 has a cutting spiral line at the outer end of each petal along the cutting curve, and the extension line of the cutting spiral line extends to the rod body composed of the first drill rod 2 and the second drill rod 4; the five groups of second PCD drill bits 25 and the five groups of third PCD drill bits 52 are respectively on the five cutting spiral lines.

[0048] The drilling diameter of the first PCD drill bit 11 and the second PCD drill bit 25 is about 150-160 mm; and the reaming range of the third PCD drill bit 52 is 150-200 mm.

[0049] The above specific embodiments do not constitute a limitation on the protection scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A geological exploration drill bit comprising: Cutting head (1), first drill rod (2), first connecting screw rod (3), second drill rod (4), reaming cutter (5), reaming top block (6), hydraulic push rod (7), second connecting screw rod (8), characterized by: the cutting head (1) is provided with spiral blades, the central axis of the cutting head (1) and the first drill rod (2) is connected through the first connecting screw rod (3); the connecting part of the first drill rod (2) and the second drill rod (4) is a tubular part, the central axis of the tubular part is provided with a top block sliding cavity; the hydraulic push rod (7) is sleeved in the second drill rod (4); the tubular wall of the tubular part is obliquely provided with a blade sliding groove, the blade sliding groove is provided with a reaming cutter (5), and one end of the reaming cutter (5) is connected with the blade sliding groove; the outer wall of the cutting head (1), the first drill rod (2) and the outer end of the reaming cutter (5) are all provided with a polycrystalline diamond drill bit; the cutting head (1), the first drill rod (2) and the second drill rod (4) are connected through the second connecting screw rod (8); the reaming top block (6) is sleeved in the top block sliding cavity, and the hydraulic push rod (7) drives the reaming top block (6) to slide in the top block sliding cavity; the reaming top block (6) drives the reaming cutter (5) to extend from or retract from the blade sliding groove.

2. The drill bit of claim 1, wherein: The five-petal spiral blade on the cutting head (1), the first polycrystalline diamond drill bit (11) is arranged on the top of the cutting head (1) and each spiral blade, and the outer end of each spiral blade is arranged along a cutting spiral curve; the outer wall of the shank of the first drill rod (2) is provided with five groups of second polycrystalline diamond drill bits (25); the reaming cutter (5) is provided with five groups, and the outer end surface of each reaming cutter (5) is provided with a third polycrystalline diamond drill bit (52); the five groups of second polycrystalline diamond drill bits (25) and the five groups of third polycrystalline diamond drill bits (52) are respectively arranged on the five cutting spiral curves.

3. The drill bit of claim 1, wherein: The cutting head (1) is provided with a positioning counterbore (12) at the axial center of the lower end surface; the positioning counterbore (12) is provided with a cutting head center threaded hole (13) at the axial center; the top end surface of the first drill rod (2) is provided with a positioning flange (21), and the positioning flange (21) can be sleeved in the positioning counterbore (12); the positioning flange (21) is provided with a center screw through hole (23), and the center screw through hole (23) coincides with the axial center line of the cutting head center threaded hole (13); one end of the first connecting screw rod (3) is sleeved in the center screw through hole (23), and the end of the first connecting screw rod (3) is threadedly locked in the cutting head center threaded hole (13).

4. The drill bit of claim 1, wherein: The cutting head (1) is provided with five connecting threaded holes (14) at the lower end surface edge, the first drill rod (2) is provided with five first connecting threaded holes (24) on the pipe wall; the second drill rod (4) is provided with a lower tubular part (41) at the upper end, the pipe wall of the second drill rod lower tubular part (41) is provided with five second connecting threaded holes (44); the first connecting threaded holes (24), the second connecting threaded holes (44) and the connecting threaded holes (14) are in corresponding positions; five second connecting threaded rods (8) are provided, the five second connecting threaded rods (8) are respectively threaded through the second connecting threaded holes (44) and the first connecting threaded holes (24) and then are in threaded connection with the connecting threaded holes (14); the axial center lines of the five second connecting threaded rods (8) are parallel to the axial center line of the first drill rod (2).

5. A drill bit for geological exploration according to any one of claims 1-4, characterized in that: The first drill rod (2) is provided with a slider upper sliding cavity (22) in the inside, and the lower tubular part (41) is provided with a slider lower sliding cavity (411); the slider upper sliding cavity (22) and the slider lower sliding cavity (411) are in butt joint to form a top block sliding cavity.

6. The drill bit of claim 5, wherein: The first drill rod (2) is provided with five groups of upper blade sliding grooves (26) at the lower end surface edge, the upper blade sliding grooves (26) are provided with upper blade shaft rod counterbores (27); the pipe wall of the second drill rod lower tubular part (41) is provided with five lower blade sliding grooves (46), and the upper end of each lower blade sliding groove (46) is provided with a lower blade shaft rod counterbore (47); the lower blade sliding groove (46) can be in butt joint with the upper blade sliding groove (26) to form a blade sliding groove; the lower blade shaft rod counterbore (47) can be in butt joint with the upper blade shaft rod counterbore (27) to form a blade shaft rod sleeve.

7. The drill bit of claim 6, wherein: The reamer (5) comprises a reamer holder (51) and a holder shaft rod (53); the reamer holder (51) can be embedded into the blade sliding groove; the upper end of the reamer holder (51) is provided with a shaft rod through hole (511), and one side of the shaft rod through hole (511) is provided with a pushing flange (512).

8. The drill bit of claim 7, wherein: The reamer top block (6) is a Laval nozzle-shaped part, and the pushing flange (512) can slide along the outer wall of the reamer top block (6).

9. The drill bit of claim 2, wherein: The first polycrystalline diamond drill bit (11) and the second polycrystalline diamond drill bit (25) have a drilling diameter of 150-160 mm; the third polycrystalline diamond drill bit (52) has a reaming range of 150-200 mm.

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