Sampling device for mineral geological exploration

Abstract

The invention relates to the technical field of geological exploration sampling equipment, and particularly provides a sampling device for mineral geological exploration, which comprises a sampling drill bit, a double-wall drill rod and a sampling tail braid which are coaxially connected and is provided with a switch assembly, and the switch assembly can control communication of a second annular channel and a spiral groove. When the sampling drill bit drills a hole, the second annular channel can be communicated with the spiral groove, so that large-particle chips generated by the sampling drill bit are discharged from the spiral groove, small-particle chips are discharged from the outer side of the spiral groove, the function of dividing large and small particles is achieved, and the blocking frequency of the spiral groove is reduced; when the sampling drill bit is used for sampling, the second annular channel and the spiral groove can be blocked, so that most of gas enters the double-wall drill rod through the inner drill bit more easily, most of the gas carries a sample to enter the double-wall drill rod and is discharged from the interior of the sampling tail braid, and the conditions that sampling is interrupted and sampling cannot be carried out are avoided.

Description

Technical Field

[0001] This invention relates to the field of geological survey and sampling equipment technology, and in particular to a sampling device for mineral geological exploration. Background Technology

[0002] A geological exploration sampling device is a piece of equipment used in geological exploration to sample soil. Geological exploration includes methods such as geochemical prospecting, drilling, pit exploration, sampling and testing, and geological remote sensing.

[0003] In the field of mineral exploration, deep-hole fixed-point sampling devices are generally used. Their working principle is mainly based on reverse circulation drilling technology and multi-stage ejection technology. Their core working mode is divided into two states: normal drilling and sampling switching. They can achieve rapid sampling at depths of rock formations without removing the double-wall drill rod. Existing deep-hole fixed-point sampling devices generally include double-wall drill rods, drill bits, and tail braces. Double-wall drill rods are generally double-wall spiral double-wall drill rods. There are two types of tail braces: drilling tail braces and sampling tail braces. When switching between normal drilling and sampling modes, deep-hole fixed-point sampling devices are generally achieved by replacing the tail braces.

[0004] During the drilling process for sampling, debris is discharged from the gap between the drill rod and the borehole wall. Because the generated debris particles are uneven in size and irregular in shape, if the gap between the drill rod and the borehole wall is small, it is easy for debris to clog and prevent material discharge. If the gap is large, a large amount of sample will be discharged from the gap instead of being collected from the central channel of the drill rod, which can easily lead to interruptions in the sampling process or even sampling failure. Summary of the Invention

[0005] Therefore, it is necessary to provide a sampling device for mineral geological exploration to address the problems of current sampling devices being prone to clogging during drilling and sampling failure during sampling.

[0006] The above objectives are achieved through the following technical solutions: A sampling device for mineral geological exploration, comprising: A sampling drill bit, wherein an inner drill bit and an outer drill bit are fixedly disposed on one end of the sampling drill bit, the inner drill bit and the outer drill bit are coaxially disposed, and a first annular channel is provided between the inner drill bit and the outer drill bit; A double-walled drill rod is coaxially connected to the sampling drill bit. The double-walled drill rod is hollow inside. A second annular channel is opened inside the side wall of the double-walled drill rod. The second annular channel is connected to the first annular channel. A spiral groove is provided on the outer periphery of the double-walled drill rod. The end of the spiral groove near the sampling drill bit is connected to the second annular channel. The sampling tail brace is coaxially connected to the end of the double-walled drill rod away from the sampling drill bit. The sampling tail brace is hollow inside, and a third annular channel is opened on the side wall of the sampling tail brace. The third annular channel is connected to the second annular channel. A switch assembly for blocking or opening the connection between the second annular channel and the spiral groove, the switch assembly being configured to connect the second annular channel and the spiral groove when the sampling drill bit is drilling a borehole, and to block the connection between the second annular channel and the spiral groove when the sampling drill bit is taking a sample.

[0007] Furthermore, the switching assembly includes a sliding ring, a first channel, and a second channel. The sliding ring is axially slidably disposed within the second annular channel. One end of the first channel is connected to a spiral groove, and the other end of the first channel is connected to the second annular channel. One end of the second channel is connected to the outer periphery of the double-walled drill pipe, and the other end of the second channel is connected to the second annular channel. When the sliding ring blocks the first channel, it opens the second channel. When the sliding ring blocks the second channel, it opens the first channel.

[0008] Furthermore, a sliding section is provided in the second annular channel, and a limit rod is provided at both ends of the sliding section. The sliding ring is axially slidably disposed in the sliding section, and the limit rod is used to limit the sliding distance of the sliding ring. The opening of the first channel is close to one end of the sliding section, and the opening of the second channel is close to the other end of the sliding section.

[0009] Furthermore, the outer periphery of the double-walled drill rod is provided with two parallel helical elastic plates, and a helical groove is formed between the two parallel helical elastic plates. The two ends of the two parallel helical elastic plates are connected to the two ends of the double-walled drill rod, and the middle part of the two parallel helical elastic plates abuts against the outer periphery of the double-walled drill rod.

[0010] Furthermore, a movable ring is axially elastically slidably disposed on one end of the double-walled drill rod near the sampling drill bit. The movable ring is fixedly connected to one of two parallel helical elastic plates closer to the movable ring. The diameter of the movable ring is smaller than the diameter of the two parallel helical elastic plates.

[0011] Furthermore, a spiral support bar is fixedly provided on the outer periphery of the double-walled drill rod. The spiral support bar is parallel to the spiral groove. The cross-section of the spiral support bar is an inverted trapezoid. The length of the lower base of the inverted trapezoid is shorter than the length of the upper base. The lower base of the inverted trapezoid is fixedly connected to the outer periphery of the double-walled drill rod, and the upper base of the inverted trapezoid is close to the inner wall of the borehole.

[0012] Furthermore, the spiral support bar is provided with multiple support rods on its side, one end of which is fixedly connected to the outer periphery of the double-walled drill rod, and the other end of which is fixedly connected to the side of the spiral support bar.

[0013] Furthermore, a through groove is formed between the helical support bar and the helical elastic sheet, which allows debris drilled by the external drill bit to pass through.

[0014] Furthermore, the sampling tail braid is provided with a first air intake channel and a second air intake channel. The first air intake channel is connected to the third annular channel, and the second air intake channel is connected to the interior of the double-walled drill rod.

[0015] Furthermore, the inner drill bit protrudes from the outer drill bit, and the diameter of the inner drill bit is smaller than the diameter of the outer drill bit.

[0016] The beneficial effects of this invention are: This invention incorporates a switching assembly that connects the second annular channel and the spiral groove. When the sampling drill bit is drilling, this assembly connects the second annular channel and the spiral groove, allowing large particles generated by the sampling drill bit to exit from the spiral groove, while small particles exit from the outside of the spiral groove. This achieves a separation of large and small particles, reducing the frequency of spiral groove blockage. When the sampling drill bit is sampling, it seals the second annular channel and the spiral groove, allowing most of the gas to more easily pass through the inner drill bit and enter the double-walled drill rod. This ensures that most of the gas carries the sample into the double-walled drill rod and exits from the sampling tail braid, preventing sampling interruptions and failures to sample.

[0017] This invention uses two parallel helical elastic plates to form a helical groove. The width of the helical groove can adaptively change with the amount of large debris (the groove width is expanded by pushing the elastic plates when the amount of debris increases). At the same time, the movable ring of the double-walled drill rod near the drill bit end can help to expand the groove opening, ensuring that large debris can pass through smoothly, avoiding the problem of slag jamming in traditional fixed-width slag discharge channels, and further reducing the risk of drilling interruption.

[0018] This invention provides rigid support for the borehole by setting a spiral support bar on the outer periphery of the double-walled drill rod. The spiral support bar is almost in contact with the inner wall of the borehole, which can prevent the borehole from collapsing due to the discharge of debris or loose geological conditions. The support rod on the side of the support bar further enhances the structural strength, ensuring the stable operation of the drill rod even in deep holes or soft rock formations, and reducing the risk of exploration accidents. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a sampling device for mineral geological exploration provided in an embodiment of the present invention; Figure 2 An exploded view of a sampling device for mineral geological exploration provided in an embodiment of the present invention; Figure 3 A front view of a sampling device for mineral geological exploration provided in an embodiment of the present invention; Figure 4 for Figure 3 A partial enlarged view of part X of a sampling device for mineral geological exploration provided in one embodiment; Figure 5 for Figure 3 A cross-sectional view along AA of a sampling device for mineral geological exploration provided in one embodiment; Figure 6 for Figure 5 A partial enlarged view of the Y-section during drilling of a sampling device for mineral geological exploration provided in one embodiment; Figure 7 for Figure 5 A partial enlarged view of the Y portion during sampling in a sampling device for mineral geological exploration provided in one embodiment; Figure 8 This is a side view of a sampling device for mineral geological exploration provided in an embodiment of the present invention; Figure 9 for Figure 8 A cross-sectional view along BB of a sampling device for mineral geological exploration provided in one embodiment; Figure 10 for Figure 9 A partial enlarged view of part Z of a sampling device for mineral geological exploration provided in one embodiment.

[0020] in: 100. Sampling drill bit; 110. Internal drill bit; 120. External drill bit; 130. First annular channel; 200. Double-walled drill pipe; 210. Second annular channel; 220. First channel; 230. Second channel; 240. Sliding ring; 250. Sliding section; 260. Limiting rod; 270. Spiral groove; 271. Spiral elastic sheet; 272. Vertical corner; 273. Movable ring; 274. Elastic element; 280. Spiral support bar; 281. Support rod; 290. Through groove; 300, Sampling tail brace; 310, Third annular channel; 320, First air intake channel; 330, Second air intake channel. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] The following reference Figures 1-10 This invention describes a sampling device for mineral geological exploration.

[0025] A sampling device for mineral geological exploration, suitable for mineral geological exploration sampling, includes a sampling drill bit 100 for drilling boreholes. An inner drill bit 110 and an outer drill bit 120 are fixedly mounted on one end of the sampling drill bit 100, coaxially arranged, with a first annular channel 130 between them. The inner drill bit 110 is hollow inside. A double-walled drill rod 200 is coaxially connected to the other end of the sampling drill bit 100. The double-walled drill rod 200 is also hollow inside. The internal structure is connected to the internal drill bit 110. A second annular channel 210 is formed on the side wall of the double-walled drill rod 200, which is connected to the first annular channel 130. A sampling tail braid 300 is coaxially connected to the end of the double-walled drill rod 200 away from the sampling drill bit 100. The sampling tail braid 300 is also hollow inside and is connected to the internal structure of the double-walled drill rod 200. A third annular channel 310 is formed in the side wall of the sampling tail braid 300, which is connected to the second annular channel 210. During surveying and sampling, it is necessary to first... A borehole of a certain depth is drilled at a designated location. The operator drives the double-walled drill rod 200 to rotate the sampling drill bit 100 at high speed, while simultaneously introducing gas into the sampling tail braid 300. The gas passes through the double-walled drill rod 200 to reach the inner drill bit 110 and the outer drill bit 120. Some gas passes through the first annular channel 130 and the second annular channel 210, while some gas crosses the outer drill bit 120 and enters the space between the borehole wall and the double-walled drill rod 200. Once drilling is complete, the gas supply to the sampling tail braid 300 is stopped. Gas is introduced into the third annular channel 310 of the sampling tail braid 300. The introduced gas passes sequentially through the second annular channel 210, the space between the inside of the borehole and the outer periphery of the double-walled drill rod 200, and then passes through the inner drill bit 110 and the outer drill bit 120, entering the inside of the double-walled drill rod 200 from the inside of the inner drill bit 110. When the gas passes through the inner drill bit 110 and the outer drill bit 120, it will drive the sample to flow. The gas will drive the sample from the inside of the double-walled drill rod 200 to the inside of the sampling tail braid 300. Finally, the sample is discharged from the sampling tail braid 300, thus completing the sample sampling.

[0026] It should be noted that the inner drill bit 110 in this invention protrudes from the outer drill bit 120, and the diameter of the inner drill bit 110 is smaller than the diameter of the outer drill bit 120. When drilling, the inner drill bit 110 will generate large particles of debris when drilling at a designated position, and the outer drill bit 120 will generate small particles of debris when drilling and enlarging the hole by the inner drill bit 110. In order to separate the large particles of debris and the small particles of debris, a spiral groove 270 is provided on the outer periphery of the double-walled drill rod 200. The spiral groove 270 allows large particles of debris to pass through, while small particles of debris pass through the sides of the spiral groove 270. One end of the spiral groove 270 near the sampling drill bit 100 is connected to the second annular channel 210, and a switch assembly is provided in the second annular channel 210. The switch assembly can connect or block the second annular channel 210 and the spiral groove 270. The switch assembly is configured to connect the second annular channel 210 and the spiral groove 270 when the sampling drill bit 100 drills. At this time, the gas drives the inner drill bit 110 to drill and generate larger particles of debris, which enter the spiral groove 270 through the second annular channel 210. Some of the gas will drive the smaller particles of debris generated when the outer drill bit 120 expands the hole through the space between the inner wall of the hole and the double-wall drill rod 200, thereby realizing the function of diverting large and small particles, thus avoiding the blockage caused by particles only passing through the spiral groove 270. Meanwhile, when drilling is complete and sampling is required, the switching assembly will block the connection between the second annular channel 210 and the spiral groove 270, making it difficult for gas to pass through the spiral groove 270. This increases the resistance between the borehole inner wall and the double-wall drill rod 200. The resistance of gas passing through the inside of the double-wall drill rod 200 is much smaller than the resistance between the borehole inner wall and the double-wall drill rod 200, making it easier for gas to pass through the inside of the double-wall drill rod 200. Therefore, the gas passing through the inside of the double-wall drill rod 200 will carry the sample into the inside of the sampling tail braid 300, thereby allowing the sample to be discharged from the inside of the sampling tail braid 300, successfully sampling, and avoiding sampling interruption or sampling failure.

[0027] Specifically, the switching assembly in this embodiment includes a sliding ring 240, a first channel 220, and a second channel 230, such as... Figure 4 , Figure 6 and Figure 10As shown, the sliding ring 240 is axially slidably disposed within the second annular channel 210 of the double-walled drill rod 200. The first channel 220 is specifically disposed on the side wall of the double-walled drill rod 200. One end of the first channel 220 is connected to the second annular channel 210, and the other end of the first channel 220 is connected to the end of the spiral groove 270 near the sampling drill bit 100. The second channel 230 is also disposed on the side wall of the double-walled drill rod 200, but the second channel 230 and the first channel 220 are circumferentially separated and are not in the same position. One end of the second channel 230 is connected to the double-walled drill rod 200. On the outer periphery, the other end of the second channel 230 is connected to the second annular channel 210. When the sliding ring 240 slides in the second annular channel 210 to block the first channel 220, the sliding ring 240 cannot block the second channel 230. That is to say, when the sliding ring 240 blocks the first channel 220, the second channel 230 is open. Similarly, when the sliding ring 240 slides in the second annular channel 210 to block the second channel 230, the sliding ring 240 cannot block the first channel 220. That is to say, when the sliding ring 240 blocks the second channel 230, the first channel 220 is open.

[0028] More specifically, in this embodiment, a sliding section 250 is provided within the second annular channel 210, and the sliding ring 240 is specifically slidably disposed within the sliding section 250, such as... Figure 6 and Figure 10 As shown, limit rods 260 are respectively provided at both ends of the sliding section 250. The limit rods 260 are used to limit the sliding distance of the sliding ring 240 within the sliding section 250, preventing the sliding ring 240 from detaching from the sliding section 250. The limit rods 260 do not obstruct the flow of gas within the sliding section 250, nor do they affect the passage of debris. The opening of the first channel 220 is located near the lower limit rod 260, and the opening of the second channel 230 is located near the upper limit rod 260. When the sliding ring 240 slides to abut against one of the limit rods 260, it can block the opening of the first channel 220 or the second channel 230.

[0029] It should be noted that the sliding power of the sliding ring 240 in this embodiment is provided by the gas introduced into the double-walled drill rod 200. For example, when the sampling drill bit 100 drills, the operator introduces gas into the sampling tail braid 300. The gas passes through the interior of the double-walled drill rod 200, and then some of the gas passes through the first annular channel 130 between the inner drill bit 110 and the outer drill bit 120. Since the first annular channel 130 is connected to the second annular channel 210 inside the double-walled drill rod 200, the gas will push the sliding ring 240 to move within the sliding section 250, moving it to the position shown in the image. Figure 6 and Figure 10After the indicated state is reached, the sliding ring 240 moves to abut against the upper limit rod 260. At the same time, the sliding ring 240 blocks the opening of the second channel 230 and opens the opening of the first channel 220. Gas can only enter the spiral groove 270 through the opening of the first channel 220. When the gas passes through the first annular channel 130 between the inner drill bit 110 and the outer drill bit 120, it will carry the large particles of debris drilled by the inner drill bit 110 into the spiral groove 270. Some gas will also pass through the outer drill bit 120, thus carrying the small particles of debris drilled by the outer drill bit 120 through the outside of the spiral groove 270, thereby diverting the debris of different sizes and reducing the frequency of blockage.

[0030] When sampling is required, the operator introduces gas into the third annular channel 310 of the sampling tail braid 300. Since the third annular channel 310 is connected to the second annular channel 210, the gas will directly push the sliding ring 240 to move as shown. Figure 7 As shown, when the sliding ring 240 moves downward, it can push out the debris accumulated in the sliding section 250. The sliding ring 240 abuts against the lower limiting rod 260. The limiting rod 260 does not affect the discharge of debris from the sliding section 250. Since the limiting rod 260 is small and cylindrical, debris will not accumulate on the outer circumference of the limiting rod 260. Some debris will remain in the first channel 220, but these debris will be driven away by the gas during the next sampling. Each time the gas supply position is switched, the sliding ring 240 will push the debris away from the sliding section 250 to prevent debris from accumulating in the sliding section 250. At the same time, the sliding ring 240 blocks the opening of the first channel 220 and opens the second channel 230. The gas will enter the space between the inner wall of the borehole and the double-walled drill rod 200 through the second channel 230. Since the first channel 220 is blocked, the resistance of the gas when passing through the spiral groove 270 is large. Therefore, most of the gas will pass through the inner drill bit 110 and the outer drill bit 120 and pass through the inside of the inner drill bit 110. In this way, it can carry the drilled sample through the inside of the double-walled drill rod 200 and finally be discharged through the sampling tail braid 300 for continuous sampling.

[0031] It should be noted that, as Figure 6 and Figure 7As shown, in this embodiment, the first channel 220 has large-arc transition sections at both ends, rather than right angles or small-arc transition structures. This structure can optimize the flow path of gas and debris, reducing the risk of particle accumulation from a fluid dynamics perspective: when gas carrying debris flows through the first channel 220, the large-arc transition section can avoid a sudden drop in airflow velocity, reducing particle settling caused by sudden changes in flow velocity; at the same time, the smooth transition surface has no structural dead corners, and debris can pass through the channel smoothly under the continuous push of airflow, without accumulating due to being stuck at corners. In addition, the smooth inner surface of the first channel 220 reduces the adhesion between debris and the inside of the first channel 220, making it less likely for debris to adhere to the inner surface of the first channel 220.

[0032] Specifically, in this embodiment, the spiral groove 270 is composed of two parallel spiral elastic sheets 271, such as... Figure 3 and Figure 4 As shown, two parallel helical elastic plates 271 are perpendicular to the outer periphery of the double-walled drill rod 200 and spirally wrap around the outer periphery of the double-walled drill rod 200. The aforementioned spiral groove 270 is formed between the two parallel helical elastic plates 271. The two ends of the two parallel helical elastic plates 271 are connected to the two ends of the double-walled drill rod 200. The middle part of the two parallel helical elastic plates 271 is not fixedly connected to the double-walled drill rod 200, but rather the two parallel helical elastic plates 271 abut against the outer periphery of the double-walled drill rod 200, and the two can slide relative to each other. At the same time, the helical elastic plates 271 are elastic, and the distance between the two parallel helical elastic plates 271 can be changed by being pushed by multiple larger particles of debris. That is, the width of the spiral groove 270 is not constant, which further reduces the clogging frequency of the spiral groove 270.

[0033] It should be noted that, as Figure 3 , Figure 4 and Figure 6As shown, in this embodiment, a movable ring 273 is axially elastically slidably sleeved on one end of the double-walled drill rod 200 near the sampling drill bit 100. The movable ring 273 is fixedly connected to one of the two parallel helical elastic plates 271 closer to the movable ring 273. Specifically, the movable ring 273 is fixedly connected to the lower end of the lower helical elastic plate 271, and the lower end of the upper helical elastic plate 271 is fixedly connected to the outer periphery of the double-walled drill rod 200. The lower ends of the two parallel helical elastic plates 271 are similar to L-shapes, that is, the lower ends of the two parallel helical elastic plates 271 are... It has a vertical bend 272, with the two vertical bends 272 close to each other and slidably connected. The diameter of the movable ring 273 is smaller than the diameter of the two parallel spiral elastic plates 271. The inner wall of the borehole drilled by the sampling drill bit 100 is almost in contact with the two parallel spiral elastic plates 271, so that the small particles generated by the outer drill bit 120 can only enter the two parallel spiral elastic plates 271 on both sides, that is, the spiral groove 270, through the outer periphery of the movable ring 273, and cannot enter the spiral groove 270, thus ensuring that large particles and small particles are separated. The movable ring 273 is axially slidably sleeved on the outer periphery of the double-walled drill rod 200, and an elastic element 274 is provided at the sliding connection position. The elastic element 274 is a compression spring. The elastic element 274 pushes the movable ring 273 upward. If multiple larger particles of debris pass between the two parallel spiral elastic plates 271 at the same time, the larger particles of debris will push the two parallel spiral elastic plates 271. The lower spiral elastic plate 271 will be pushed downward, thereby increasing the distance between the two parallel spiral elastic plates 271, so that multiple larger particles of debris can pass through at the same time.

[0034] In a further embodiment, a spiral support bar 280 is fixedly provided around the outer periphery of the double-walled drill rod 200 of the present invention. The spiral support bar 280 is parallel to the spiral groove 270. The cross-section of the spiral support bar 280 is an inverted trapezoid, with the lower base of the inverted trapezoid shorter than the upper base. The lower base of the inverted trapezoid is fixedly connected to the outer periphery of the double-walled drill rod 200, and the upper base of the inverted trapezoid is close to the inner wall of the borehole. The spiral support bar 280 is almost in contact with the inner wall of the borehole, thereby providing support and preventing the borehole from collapsing.

[0035] It should be noted that after the spiral support bar 280 is set, a through groove 290 is formed between the two parallel spiral elastic plates 271 on their opposite sides and the spiral support bar 280. This through groove 290 allows small particles of debris drilled by the outer drill bit 120 to pass through. It can be understood that the spiral groove 270 between the two parallel spiral elastic plates 271 allows large particles of debris drilled by the inner drill bit 110, while the through groove 290 on the outer side of the two parallel spiral elastic plates 271 allows small particles of debris drilled by the outer drill bit 120, thus realizing the function of separating large and small particles.

[0036] Specifically, in order to improve the support strength of the spiral support bar 280, multiple support rods 281 are provided on the side of the spiral support bar 280. One end of the multiple support rods 281 is fixedly connected to the outer periphery of the double-wall drill rod 200, and the other end of the multiple support rods 281 is fixedly connected to the side of the spiral support bar 280.

[0037] It should be noted that the multiple support rods 281 are specifically located in the through grooves 290 on both sides of the spiral groove 270. Since the through grooves 290 are filled with small particles of debris generated by the external drill bit 120, the setting of the multiple support rods 281 has little impact on these small particles of debris when they pass through the through grooves 290, and can be ignored.

[0038] In a further embodiment, to facilitate gas entry from the interior of the sampling braid 300 or the third annular channel 310, this embodiment provides a first air inlet channel 320 and a second air inlet channel 330 on the end of the sampling braid 300 away from the double-walled drill rod 200, such as... Figure 2 and Figure 9 As shown, the first air intake channel 320 is connected to the third annular channel 310 of the sampling tail braid 300, and the second air intake channel 330 is connected to the interior of the sampling tail braid 300. When the sampling drill bit 100 needs to drill, the operator connects the interface of the air pump (not shown in the figure) to the second air intake channel 330, and the gas enters the interior of the sampling tail braid 300; when sampling is needed, the operator connects the interface of the air pump to the first air intake channel 320, and the gas enters the third annular channel 310 of the sampling tail braid 300.

[0039] The specific working process of a sampling device for mineral geological exploration provided by the present invention will be described in conjunction with the above embodiments: drilling: The operator drives the double-walled drill rod 200 to rotate the sampling drill bit 100 at high speed. Simultaneously, the interface of the air pump (not shown in the figure) is connected to the second air inlet channel 330. Gas enters the interior of the sampling tail braid 300, then passes through the interior of the double-walled drill rod 200 and through the interior of the inner drill bit 110 of the sampling drill bit 100. The operator aligns the sampling drill bit 100 with the desired drilling position. The inner drill bit 110 and outer drill bit 120 of the sampling hole rotate at high speed. Because the inner drill bit 110 protrudes beyond the outer drill bit 120... 20. The inner drill bit 110 begins drilling. The outer drill bit 120, with a diameter larger than that of the inner drill bit 110, enlarges the hole drilled by the inner drill bit 110. During drilling, the inner drill bit 110 produces large particles of debris, while the outer drill bit 120, being an enlarging drill bit, produces small particles of debris. Under the influence of some gas, the large particles of debris pass through the first annular channel 130 between the inner drill bit 110 and the outer drill bit 120 and enter the second annular channel 210 of the double-walled drill rod 200. Simultaneously, if... Figure 6As shown, the gas pushes the sliding ring 240 in the second annular channel 210 to the limiting rod 260 above the sliding section 250. At this time, the sliding ring 240 blocks the opening of the second channel 230, and the gas can only carry large particles of debris through the opening of the first channel 220 and enter the spiral groove 270 on the outer periphery of the double-walled drill rod 200. At the same time, some gas will pass through the interior of the inner drill bit 110 and enter the space between the borehole and the double-walled drill rod 200 from the outer drill bit 120. This part of the gas will carry the small particles of debris generated by the outer drill bit 120 into the through grooves 290 on both sides of the spiral groove 270, realizing the function of separating large and small particles of debris, thereby reducing the frequency of blockage.

[0040] sampling: After the sampling drill bit 100 completes drilling, sampling begins. The operator connects the air pump interface to the first air inlet channel 320, and the gas enters the third annular channel 310 of the sampling tail braid 300. At this time, the double-walled drill rod 200 still needs to drive the sampling drill bit 100 to rotate at high speed to drill for the sample. The gas enters the second annular channel 210 through the third annular channel 310. Figure 7 As shown, the gas pushes the sliding ring 240 downward within the sliding section 250 to the lower limiting rod 260. As the sliding ring 240 slides downward, it discharges debris from the sliding section 250. At this time, the sliding ring 240 blocks the opening of the first channel 220 and opens the opening of the second channel 230. Gas enters the space between the outer periphery of the double-walled drill pipe 200 and the inner wall of the borehole through the opening of the second channel 230. Because the first channel 220 is blocked, large debris cannot pass through the spiral groove 270. Furthermore, the gas has difficulty passing through the spiral groove 270. Therefore, most of the gas is discharged from the second channel 230 and then passes through the outer drill bit 120 of the sampling drill bit 100 and the inner drill bit 110 to enter the interior of the double-wall drill rod 200. At this time, the gas will carry the drilled sample into the interior of the double-wall drill rod 200. Subsequently, the gas carries the sample into the interior of the sampling tail braid 300 and finally discharges from the interior of the sampling tail braid 300, thereby carrying out continuous sampling operations and avoiding sampling interruption and sampling failure.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A sampling device for mineral geological exploration, characterized in that, include: A sampling drill bit, wherein an inner drill bit and an outer drill bit are fixedly disposed on one end of the sampling drill bit, the inner drill bit and the outer drill bit are coaxially disposed, and a first annular channel is provided between the inner drill bit and the outer drill bit; A double-walled drill rod is coaxially connected to the sampling drill bit. The double-walled drill rod is hollow inside. A second annular channel is opened inside the side wall of the double-walled drill rod. The second annular channel is connected to the first annular channel. A spiral groove is provided on the outer periphery of the double-walled drill rod. The end of the spiral groove near the sampling drill bit is connected to the second annular channel. The sampling tail brace is coaxially connected to the end of the double-walled drill rod away from the sampling drill bit. The sampling tail brace is hollow inside, and a third annular channel is opened on the side wall of the sampling tail brace. The third annular channel is connected to the second annular channel. A switch assembly for blocking or opening the connection between the second annular channel and the spiral groove, the switch assembly being configured to connect the second annular channel and the spiral groove when the sampling drill bit is drilling a borehole, and to block the connection between the second annular channel and the spiral groove when the sampling drill bit is taking a sample.

2. The sampling device for mineral geological exploration according to claim 1, characterized in that, The switching assembly includes a sliding ring, a first channel, and a second channel. The sliding ring is axially slidably disposed within the second annular channel. One end of the first channel is connected to a spiral groove, and the other end of the first channel is connected to the second annular channel. One end of the second channel is connected to the outer periphery of the double-walled drill pipe, and the other end of the second channel is connected to the second annular channel. When the sliding ring blocks the first channel, it opens the second channel. When the sliding ring blocks the second channel, it opens the first channel.

3. The sampling device for mineral geological exploration according to claim 2, characterized in that, The second annular channel is provided with a sliding section, and a limit rod is provided at both ends of the sliding section. The sliding ring is axially slidably disposed in the sliding section, and the limit rod is used to limit the sliding distance of the sliding ring. The opening of the first channel is close to one end of the sliding section, and the opening of the second channel is close to the other end of the sliding section.

4. The sampling device for mineral geological exploration according to claim 1, characterized in that, The outer periphery of the double-walled drill rod is provided with two parallel helical elastic plates, and a helical groove is formed between the two parallel helical elastic plates. The two ends of the two parallel helical elastic plates are connected to the two ends of the double-walled drill rod, and the middle part of the two parallel helical elastic plates abuts against the outer periphery of the double-walled drill rod.

5. The sampling device for mineral geological exploration according to claim 4, characterized in that, The double-walled drill rod has an axially elastically sliding movable ring at one end near the sampling drill bit. The movable ring is fixedly connected to the one of two parallel helical elastic plates closer to the movable ring. The diameter of the movable ring is smaller than the diameter of the two parallel helical elastic plates.

6. The sampling device for mineral geological exploration according to claim 4, characterized in that, A spiral support bar is fixedly installed on the outer periphery of the double-walled drill rod. The spiral support bar is parallel to the spiral groove. The cross-section of the spiral support bar is an inverted trapezoid. The length of the lower base of the inverted trapezoid is shorter than the length of the upper base. The lower base of the inverted trapezoid is fixedly connected to the outer periphery of the double-walled drill rod, and the upper base of the inverted trapezoid is close to the inner wall of the borehole.

7. The sampling device for mineral geological exploration according to claim 6, characterized in that, The spiral support bar has multiple support rods on its side. One end of each support rod is fixedly connected to the outer periphery of the double-walled drill rod, and the other end of each support rod is fixedly connected to the side of the spiral support bar.

8. The sampling device for mineral geological exploration according to claim 6, characterized in that, A through groove is formed between the spiral support bar and the spiral elastic sheet, allowing debris drilled by the external drill bit to pass through.

9. The sampling device for mineral geological exploration according to claim 1, characterized in that, The sampling tail braid has a first air intake channel and a second air intake channel. The first air intake channel is connected to the third annular channel, and the second air intake channel is connected to the interior of the double-walled drill rod.

10. The sampling device for mineral geological exploration according to claim 1, characterized in that, The inner drill bit protrudes from the outer drill bit, and the diameter of the inner drill bit is smaller than the diameter of the outer drill bit.

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