Double-pipe coring device for sand gold ore exploration

Abstract

The utility model relates to the technical field of sand gold ore exploration, and discloses a double-pipe coring device for sand gold ore exploration, which comprises an outer pipe and an inner pipe, the outer pipe is sleeved outside the inner pipe, the lower end of the outer pipe is provided with a first drill bit, the lower end of the inner pipe is provided with a second drill bit, the side wall of the second drill bit is provided with a plurality of connecting holes, and the connecting holes are provided with plugging pieces. And the end part of the plugging piece penetrates through the connecting hole and extends into the second drill bit. Compared with the prior art, the safety is higher, double pipes conduct drilling operation at the same time, hole position collapse in the sampling process is effectively avoided, sand core samples can be prevented from sliding off, and the coring efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of placer gold exploration technology, specifically a dual-tube coring device for placer gold exploration. Background Technology

[0002] Placer gold deposits are a type of gold deposit formed by the deposition of primary gold deposits in rivers after weathering and erosion. Their distribution is controlled by the source of recharge, hydrodynamics, and geomorphology. China is rich in placer gold resources, with more than 3,200 known deposits distributed in 27 provinces. The most concentrated areas are northwestern Sichuan, the border area between Guangdong and Guangxi, and the Hunchun River basin. Heilongjiang Province has the largest proven reserves in the country, reaching 377.29 tons.

[0003] In the field of placer gold exploration, the traditional single-tube drilling method has long been plagued by difficulties in sampling and low efficiency. When facing fractured strata such as pebble layers and sand layers, the sand core samples inside the single-tube drill pipe are too loose and easily slip when the core pipe is lifted. This results in a large number of sand core samples falling back into the borehole. Obtaining authentic, undisturbed, original sand core samples is virtually impossible. Furthermore, frequent borehole collapses during core sampling make the operation extremely difficult. In addition, core processes such as changing casing and core drill pipes are highly dependent on manual labor, which is not only cumbersome and labor-intensive but also poses a serious safety risk of accidental injury from drill pipes.

[0004] In view of this, the applicant conducted in-depth research on the above-mentioned issues, which led to this case. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a dual-tube coring device for placer gold exploration, which offers enhanced safety, prevents sand core samples from slipping, and improves coring efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A dual-tube coring device for placer gold exploration includes an outer tube and an inner tube. The outer tube is sleeved outside the inner tube. A first drill bit is provided at the lower end of the outer tube, and a second drill bit is provided at the lower end of the inner tube. The side wall of the second drill bit is provided with several connecting holes. A sealing element is provided on the connecting holes. The end of the sealing element passes through the connecting hole and extends into the second drill bit to form a sealing mesh.

[0008] Furthermore, the outer wall of the second drill bit is provided with a clearance hole that communicates with the connecting hole.

[0009] Furthermore, the sealing element is a U-shaped rope, which includes a curved portion and a sealing end. The sealing end is located on both sides of the curved portion, and the sealing ends on both sides pass through the connecting hole and extend into the interior of the second drill bit.

[0010] Further, the several blocking ends are interwoven in the second drill bit to form a blocking net.

[0011] Further, the blocking ends are upwardly inclined.

[0012] Further, the U-shaped rope is a steel wire rope strand structure formed by winding together a plurality of steel wire strands.

[0013] Further, the lower end of the outer tube is provided with a first inner threaded section, the upper end of the first drill bit is provided with a first outer threaded section, and the first inner threaded section and the first outer threaded section are threadedly connected.

[0014] Further, the lower end of the inner tube is provided with a second inner threaded section, the upper end of the second drill bit is provided with a second outer threaded section, and the second inner threaded section and the second outer threaded section are threadedly connected.

[0015] Further, the upper end of the outer tube is provided with a third outer threaded section, and the upper end of the inner tube is provided with a fourth outer threaded section.

[0016] Further, the end faces of the first drill bit and the second drill bit are provided with protrusions.

[0017] The utility model provides a kind of, with following beneficial effects:

[0018] 1, the utility model is double-pipe structure, when working, outer tube carries first drill bit and first drills into, forms a stable pilot hole and always remains in hole.This is equivalent to for subsequent inner tube of coring constructs a solid barrier, can effectively support hole wall, and the loose sand gold mine layer with inner tube operating area is physically isolated, fundamentally avoids burying or damaging inner tube and rock core due to hole wall collapse.

[0019] 2, the outer tube of the utility model provides a smooth, regular and not collapsed stable channel for the rotation sampling of inner tube, ensures the continuity of coring process and the success rate of sampling.

[0020] 3, the blocking member of the second drill bit bottom of the utility model can form a blocking net, and can effectively hold and support the loose rock core taken when lifting inner tube.This prevents rock core from falling from the bottom during lifting, greatly improves the success rate of sampling and sampling efficiency.

[0021] 4, in the utility model, outer tube and first drill bit, inner tube and second drill bit are all connected by thread, and the overall structure is rigid and stable.In drilling process, drill pressure and torque can be effectively transmitted, and additional disturbance caused by drill tool shaking and impact on hole wall is reduced, which is crucial for maintaining the stability of loose formation hole wall, and indirectly plays a role in preventing hole collapse. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1It is a decomposition profile schematic view of the utility model.

[0023] Figure 2 It is a structure profile plan view of the utility model.

[0024] Figure 3 It is a structure state view of the plugging member when drilling.

[0025] Figure 4 It is Figure 2 It is a local enlarged view of A area.

[0026] Wherein, outer tube 1, first inner thread section 11, third outer thread section 12, inner tube 2, second inner thread section 21, fourth outer thread section 22, first drill bit 3, first outer thread section 31, second drill bit 4, connecting hole 41, second outer thread section 42, give way hole 43, plugging member 5, bending part 51, plugging end 52, plugging net 6. Specific implementation

[0027] The technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model specification, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0028] Please refer to the drawings of the utility model Figure 1 - the drawings of the utility model Figure 3 The utility model embodiment provides a double -tube coring device for placer exploration, including outer tube 1 and inner tube 2, and outer tube 1 and inner tube 2 are all hollow tubular structure. Outer tube 1 is sleeved in inner tube 2, and the lower end of outer tube 1 is provided with first drill bit 3, and the lower end of inner tube 2 is provided with second drill bit 4, and the end face of first drill bit 3 and second drill bit 4 is provided with the protrusion for the drilling of first drill bit 3 and second drill bit 4. The side wall of second drill bit 4 is provided with a plurality of connecting holes 41, the connecting hole 41 is provided with plugging member 5, and the end of plugging member 5 passes through connecting hole 41 and extends into second drill bit 4 to form plugging net 6. Using the above structure, when second drill bit 4 drills into the sampling hole, the end of plugging member 5 is subjected to greater pressure, so that the end of plugging member 5 is bent upwards, ensuring that the rock core can smoothly enter inner tube 2 when second drill bit 4 drills. When second drill bit 4 is lifted, the pressure on plugging member 5 is smaller, so that plugging net 6 can be formed to block the lower end opening of inner tube 2, preventing the rock core from falling from the bottom during lifting, greatly improving the success rate of sampling and sampling efficiency. When working, outer tube 1 and inner tube 2 impact rotary drilling, drilling in complex bottom layer, such as sand layer, sand and gravel stratum, not easy to collapse hole, and the real core sample of each sampling section can be obtained. In addition, the steel wire rope is provided, which can effectively prevent the sand core sample from falling off and ensure the success rate of sampling.

[0029] In the embodiment, the outer side wall of the second drill bit 4 is provided with a clearance hole 43 communicating with the connecting hole 41, the clearance hole 43 provides clearance for the outer side connecting end of the plugging member 5, so that the connecting end of the plugging member 5 can be embedded into the clearance hole during operation, so that the second drill bit 4 will not rub against the plugging member 5 during earth drilling operation, thereby prolonging the service life of the plugging member 5.

[0030] In the embodiment, the plugging member 5 is a U-shaped rope, which is a steel wire rope structure formed by winding multiple steel wire ropes together. The U-shaped rope includes a curved portion 51 and plugging ends 52 arranged on both sides of the curved portion 51. The plugging ends 52 on both sides pass through the connecting hole 41 and extend into the second drill bit 4. In this embodiment, the two adjacent clearance holes 43 are connected to each other to form a long clearance hole 43, so that the curved portion 51 of the U-shaped rope can be completely embedded in the clearance hole 43. The plurality of plugging ends 52 interweave to form a plugging net 6 in the second drill bit 4. With the above structure, the two plugging ends 52 of the U-shaped rope are directly inserted into the connecting hole 41 during use, thereby completing the installation of the plugging member 5 and making the disassembly of the plugging member 5 more convenient.

[0031] In the embodiment, the plugging ends 52 are upwardly inclined, so that when the inner tube 2 drills a hole, the plugging ends 52 are inclined upward to facilitate the core entering the inner tube 2; and when the inner tube 2 is lifted, the plugging ends 52 are prevented from bending downward, thereby ensuring the plugging of the core and preventing the core from falling apart. In addition, the above-mentioned plugging member 5 can also be a rope structure with multiple plugging ends 52, and is not limited to the U-shaped rope structure with only two plugging ends 52.

[0032] In the embodiment, the lower end of the outer tube 1 is provided with a first inner threaded section 11, the upper end of the first drill bit 3 is provided with a first outer threaded section 31, and the first inner threaded section 11 and the first outer threaded section 31 are threadedly connected. The lower end of the inner tube 2 is provided with a second inner threaded section 21, and the upper end of the second drill bit 4 is provided with a second outer threaded section 42. The second inner threaded section 21 and the second outer threaded section 42 are threadedly connected. This makes the disassembly of the outer tube 1 and the inner tube 2 and the drill bit more rapid and convenient. The upper end of the outer tube 1 is provided with a third outer threaded section 12, and the upper end of the inner tube 2 is provided with a fourth outer threaded section 22. The third outer threaded section 12 can be threadedly connected with the first inner threaded section 11, and the outer tube 1 can be connected with the output shaft of the percussion rotary motor through an adapter via the third outer threaded section 12. The fourth outer threaded section 22 can be threadedly connected with the second inner threaded section 21, and the inner tube 2 can be connected with the output shaft of the percussion rotary motor through an adapter via the fourth outer threaded section 22. In this way, when the sampling depth is deep, multiple inner tubes 2 and outer tubes 1 can be connected end to end, thereby increasing the drilling depth and making the connection more convenient and firm.

[0033] The utility model discloses a working principle: the upper end of outer tube 1 is connected with rotating impact motor through adapter, and outer tube 1 is impacted and penetrates into the earth. After that, outer tube 1 is separated from rotating impact motor, the upper end of inner tube 2 is connected with rotating impact motor through adapter, and inner tube 2 is impacted and penetrates into the earth in outer tube 1, in this process, the sealing end 52 of sealing piece 5 is curved upwards to ensure that the rock core smoothly enters into inner tube 2, then inner tube 2 is lifted out, and when inner tube 2 is lifted, the rock core is lifted together, and sealing piece 5 seals the lower end opening of inner tube 2, avoiding the loose rock core from scattering.

[0034] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A dual tube coring device for exploration of alluvial gold deposits, characterised in that, The drill bit comprises an outer tube and an inner tube, the outer tube is sleeved outside the inner tube, the lower end of the outer tube is provided with a first drill bit, the lower end of the inner tube is provided with a second drill bit, the side wall of the second drill bit is provided with a plurality of connecting holes, the connecting holes are provided with blocking pieces, the end of the blocking piece penetrates the connecting hole and extends into the second drill bit to form a blocking net.

2. The dual tube coring device for exploration of gold placer deposits according to claim 1, characterized in that The outer side wall of the second drill bit is provided with a relief hole in communication with the connecting hole.

3. A dual tube coring device for exploration of gold placer deposits according to claim 2, characterized in that, The blocking piece is a U-shaped rope, the U-shaped rope comprises a bending part and blocking ends, the blocking ends are arranged on both sides of the bending part, the blocking ends on both sides penetrate the connecting hole and extend into the second drill bit.

4. The dual tube coring device for exploration of gold placer deposits according to claim 3, characterized in that, The plurality of blocking ends are interwoven in the second drill bit to form a blocking net.

5. A dual tube coring device for exploration of gold placer deposits according to claim 4, characterized in that, The blocking end is arranged upwardly inclined.

6. The dual tube coring device for exploration of gold placer deposits according to claim 3, characterized in that, The U-shaped rope is a steel wire rope strand structure in which a plurality of steel wire strands are wound together.

7. The dual tube coring device for exploration of placer deposits according to claim 1, characterized in that, The lower end of the outer tube is provided with a first inner threaded section, the upper end of the first drill bit is provided with a first outer threaded section, and the first inner threaded section and the first outer threaded section are threadedly connected.

8. The dual tube coring device for exploration of gold placer deposits according to claim 7, characterized in that The lower end of the inner tube is provided with a second inner threaded section, the upper end of the second drill bit is provided with a second outer threaded section, and the second inner threaded section and the second outer threaded section are threadedly connected.

9. The dual tube coring device for exploration of gold placer deposits according to claim 8, characterized in that, The upper end of the outer tube is provided with a third outer threaded section, and the upper end of the inner tube is provided with a fourth outer threaded section.

10. The dual tube coring device for exploration of gold placer deposits according to claim 1, characterized in that, The end faces of the first drill bit and the second drill bit are provided with protrusions.

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