A sampling device for mineral geological exploration

Abstract

The present application relates to geological survey sampling equipment technical field, specifically provide a kind of for mineral geological exploration sampling device, including sampling drill bit, double-wall drill pipe and sampling tail braid, three coaxial connections are connected, and switch assembly is arranged, switch assembly can control the communication of second annular passage and spiral groove, when sampling drill bit drilling, second annular passage and spiral groove can be communicated, so that the large particle debris generated by sampling drill bit is discharged from spiral groove, while small particle debris is discharged from the outside of spiral groove, realize the function of size particle diversion, reduce the frequency of spiral groove blockage, when sampling drill bit sampling, second annular passage and spiral groove can be blocked, so that most of the gas is more easily passed through inner drill bit inside to enter into double-wall drill pipe inside, so that most of the gas carries sample into double-wall drill pipe and is discharged from inside sampling tail braid, avoid the appearance of sampling interruption, cannot sample the situation appears.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geological survey sampling equipment, in particular to a sampling device for mineral geological exploration. BACKGROUND

[0002] The geological exploration sampling device is a device for sampling soil in geological exploration, and the geological exploration includes geochemical prospecting, drilling, pit exploration, sampling testing, geological remote sensing and other geological exploration methods.

[0003] In the field of mineral exploration, a deep hole fixed-point sampling device is generally used, and its working principle is mainly based on reverse circulation drilling technology and multi-stage injection technology. Its core working mode includes normal drilling and sampling switching. The deep hole fixed-point sampling device can realize rapid sampling of deep rock layers without removing the double-wall drill rod. The existing deep hole fixed-point sampling device generally includes a double-wall drill rod, a drill bit and a tail braid. The double-wall drill rod is generally a double-wall spiral double-wall drill rod. The tail braid has two types, namely a drilling tail braid and a sampling tail braid. When the deep hole fixed-point sampling device switches between normal drilling and sampling modes, the tail braid is generally replaced to realize the switching.

[0004] During the drilling process, the debris is discharged from the gap between the drill rod and the hole wall. Since the size of the generated debris particles is uneven and the shape is irregular, if the gap between the drill rod and the hole wall is small, the debris is prone to blockage and cannot be discharged. 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, and the sampling process is prone to interruption or even failure. SUMMARY

[0005] Therefore, it is necessary to provide a sampling device for mineral geological exploration to solve the problems that the existing sampling device is prone to blockage during drilling and prone to sampling failure during sampling.

[0006] The above-mentioned purpose is achieved by the following technical scheme:

[0007] A sampling device for mineral geological exploration, comprising:

[0008] A sampling drill bit is fixedly provided with an inner drill bit and an outer drill bit at one end, the inner drill bit and the outer drill bit are coaxially arranged, and the inner drill bit and the outer drill bit have a first annular channel therebetween;

[0009] A double-wall drill rod is coaxially connected with the sampling drill bit, the double-wall drill rod is hollow, a second annular channel is formed in the inner wall of the double-wall drill rod, the second annular channel is in communication with the first annular channel, a spiral groove is arranged on the outer periphery of the double-wall drill rod, and one end of the spiral groove close to the sampling drill bit is in communication with the second annular channel;

[0010] A sampling tail braid coaxially connected to the double-wall drill rod away from the sampling drill bit, the sampling tail braid is hollow inside, the third annular channel is opened in the side wall of the sampling tail braid, and the third annular channel is in communication with the second annular channel;

[0011] A switch assembly for blocking or opening the communication between the second annular channel and the spiral groove, the switch assembly is configured to communicate the second annular channel and the spiral groove when the sampling drill bit drills a borehole, and to block the communication between the second annular channel and the spiral groove when the sampling drill bit samples.

[0012] Further, the switch assembly includes a sliding ring, a first channel and a second channel, the sliding ring is axially slidingly arranged in the second annular channel, one end of the first channel is in communication with the spiral groove, the other end of the first channel is in communication with the second annular channel, one end of the second channel is in communication with the outer periphery of the double-wall drill rod, the other end of the second channel is in communication with the second annular channel, the sliding ring opens the second channel when it blocks the first channel, and the sliding ring opens the first channel when it blocks the second channel.

[0013] Further, a sliding section is arranged in the second annular channel, limit rods are arranged at both ends of the sliding section, the sliding ring is axially slidingly arranged in the sliding section, the limit rods are 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.

[0014] Further, two mutually parallel spiral elastic pieces are arranged on the outer periphery of the double-wall drill rod, the spiral groove is formed between the two mutually parallel spiral elastic pieces, both ends of the two mutually parallel spiral elastic pieces are connected to both ends of the double-wall drill rod, and the middle portions of the two mutually parallel spiral elastic pieces abut against the outer periphery of the double-wall drill rod.

[0015] Further, a movable ring is axially elastically slidingly arranged on one end of the double-wall drill rod close to the sampling drill bit, the movable ring is fixedly connected to one of the two mutually parallel spiral elastic pieces closer to the movable ring, and the diameter of the movable ring is smaller than the diameter of the two mutually parallel spiral elastic pieces.

[0016] Further, a spiral support strip is fixedly arranged on the outer periphery of the double-wall drill rod, the spiral support strip is parallel to the spiral groove, the cross section of the spiral support strip 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-wall drill rod, and the upper base of the inverted trapezoid is close to the inner wall of the borehole.

[0017] Further, a plurality of support rods are arranged on the side edge of the spiral support strip, one end of the plurality of support rods is fixedly connected to the outer periphery of the double-wall drill rod, and the other end of the plurality of support rods is fixedly connected to the side edge of the spiral support strip.

[0018] Further, a through groove is formed between the spiral support strip and the spiral elastic sheet, and the through groove allows the drill cuttings drilled by the outer drill bit to pass through.

[0019] Further, the sampling tail braid is provided with a first air inlet channel and a second air inlet channel, the first air inlet channel is communicated with the third annular channel, and the second air inlet channel is communicated with the inside of the double-wall drill rod.

[0020] Further, 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.

[0021] The beneficial effects of the present application are:

[0022] The switch assembly can connect the second annular channel and the spiral groove, and when the sampling drill bit drills a hole, the second annular channel and the spiral groove are connected, so that the large-particle drill cuttings generated by the sampling drill bit are discharged from the spiral groove, and the small-particle drill cuttings are discharged from the outside of the spiral groove, realizing the function of separating large and small particles and reducing the frequency of spiral groove blockage. When the sampling drill bit is sampling, the second annular channel and the spiral groove are blocked, so that most of the gas can more easily enter the inside of the double-wall drill rod through the inside of the inner drill bit, so that most of the gas carries the sample into the double-wall drill rod and is discharged from the inside of the sampling tail braid, avoiding the situation that the sampling is interrupted and cannot be sampled.

[0023] The two parallel spiral elastic sheets constitute a spiral groove, and the width of the spiral groove can adaptively change with the number of large-particle drill cuttings (when the amount of drill cuttings increases, the elastic sheet is pushed to expand the groove width); at the same time, the movable ring of the double-wall drill rod near the drill bit end can assist in expanding the slot, ensuring that the large-particle drill cuttings pass smoothly, avoiding the problem of jamming of the traditional fixed-width drill cuttings discharge channel, and further reducing the risk of drilling interruption.

[0024] The spiral support strip is arranged on the outer periphery of the double-wall drill rod, and the spiral support strip is almost attached to the inner wall of the drill hole, which can provide rigid support for the drill hole and avoid the collapse of the drill hole caused by the discharge of drill cuttings or loose geology; the support rods on the side edges of the support strip further enhance the structural strength, so that the drill rod can stably operate even in a deep hole or a soft rock layer, and the risk of exploration accidents is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The structure diagram of the sampling device for mineral geological exploration provided by an embodiment of the present application is shown;

[0026] Figure 2 The exploded view of the sampling device for mineral geological exploration provided by an embodiment of the present application is shown;

[0027] Figure 3 A front view of the sampling device for mineral geological exploration according to an embodiment of the present application;

[0028] Figure 4 A front view of the sampling device for mineral geological exploration according to an embodiment of the present application; Figure 3 A front view of the sampling device for mineral geological exploration according to an embodiment of the present application;

[0029] Figure 5 A front view of the sampling device for mineral geological exploration according to an embodiment of the present application; Figure 3 A front view of the sampling device for mineral geological exploration according to an embodiment of the present application;

[0030] Figure 6 A front view of the sampling device for mineral geological exploration according to an embodiment of the present application; Figure 5 A front view of the sampling device for mineral geological exploration according to an embodiment of the present application;

[0031] Figure 7 A front view of the sampling device for mineral geological exploration according to an embodiment of the present application; Figure 5 A front view of the sampling device for mineral geological exploration according to an embodiment of the present application;

[0032] Figure 8 A front view of the sampling device for mineral geological exploration according to an embodiment of the present application;

[0033] Figure 9 A front view of the sampling device for mineral geological exploration according to an embodiment of the present application; Figure 8 A front view of the sampling device for mineral geological exploration according to an embodiment of the present application;

[0034] Figure 10 A front view of the sampling device for mineral geological exploration according to an embodiment of the present application; Figure 9 A front view of the sampling device for mineral geological exploration according to an embodiment of the present application;

[0035] Wherein:

[0036] 100, sampling drill bit; 110, inner drill bit; 120, outer drill bit; 130, first annular channel;

[0037] 200, double-wall drill rod; 210, second annular channel; 220, first channel; 230, second channel; 240, sliding ring; 250, sliding section; 260, limiting rod; 270, helical groove; 271, helical elastic piece; 272, vertical corner; 273, movable ring; 274, elastic member; 280, helical support strip; 281, support rod; 290, through groove;

[0038] 300, sampling tail; 310, third annular channel; 320, first air inlet channel; 330, second air inlet channel. DETAILED DESCRIPTION

[0039] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the embodiments and in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0040] The numbers of components in this document, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The "connection" and "coupling" in the present application include direct and indirect connection (coupling) unless otherwise specified. In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0041] In the present application, unless otherwise specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0042] The present application provides a sampling device for mineral geological exploration. Figures 1-10 The present application provides a sampling device for mineral geological exploration.

[0043] The utility model provides a kind of sampling device for mineral geological exploration, it is suitable for mineral geological exploration sampling, including sampling drill bit 100, sampling drill bit 100 is used to drill borehole, fixedly arranged with inner drill bit 110 and outer drill bit 120 on one end of sampling drill bit 100, inner drill bit 110 and outer drill bit 120 are coaxially arranged, there is first annular passage 130 between inner drill bit 110 and outer drill bit 120, inner drill bit 110 is hollow inside, coaxially connected with double-wall drill rod 200 on the other end of sampling drill bit 100, double-wall drill rod 200 is hollow inside, and the inside of double-wall drill rod 200 is communicated with the inside of inner drill bit 110, second annular passage 210 is arranged on the lateral wall of double-wall drill rod 200, and second annular passage 210 is communicated with first annular passage 130, coaxially connected with sampling tail plume 300 on the end of double-wall drill rod 200 away from sampling drill bit 100, and the inside of sampling tail plume 300 is also hollow, and the inside of sampling tail plume 300 is communicated with the inside of double-wall drill rod 200, third annular passage 310 is arranged in the lateral wall of sampling tail plume 300, and third annular passage 310 is communicated with second annular passage 210, when surveying sampling, borehole of certain depth needs to be drilled in specified position, when this, operator drives double-wall drill rod 200 to drive sampling drill bit 100 high-speed rotation, simultaneously, gas is introduced into the inside of sampling tail plume 300, and gas reaches the position of inner drill bit 110 and outer drill bit 120 by passing through the inside of double-wall drill rod 200, part of gas passes through first annular passage 130 and second annular passage 210, and another part of gas enters the space between the inner wall of borehole and double-wall drill rod 200 by passing outer drill bit 120;When borehole is completed, stop introducing gas into the inside of sampling tail plume 300, but introduce gas into third annular passage 310 of sampling tail plume 300, and the gas introduced will pass through second annular passage 210, the space between the inside of borehole and the periphery of double-wall drill rod 200 in proper order, then enter the inside of double-wall drill rod 200 from the inside of inner drill bit 110 by passing inner drill bit 110 and outer drill bit 120, and gas passes through inner drill bit 110 and outer drill bit 120 and drives sample to flow, and sample is driven from the inside of double-wall drill rod 200 to the inside of sampling tail plume 300 by gas, and finally sample is discharged from sampling tail plume 300, to complete the sampling of sample.

[0044] It should be noted that the inner drill bit 110 in the application 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 drills a hole at a specified position to produce large-particle debris, and the outer drill bit 120 expands the hole drilled by the inner drill bit 110 to produce small-particle debris. To separate the large-particle debris and the small-particle debris, a spiral groove 270 is arranged on the outer periphery of the double-wall drill rod 200. The spiral groove 270 allows the large-particle debris to pass through, and the small-particle debris passes through from both sides of the spiral groove 270. The end of the spiral groove 270 close to the sampling drill bit 100 is in communication with the second annular channel 210, and a switch assembly is arranged in the second annular channel 210. The switch assembly can communicate or block the second annular channel 210 and the spiral groove 270. The switch assembly is configured to communicate the second annular channel 210 and the spiral groove 270 when the sampling drill bit 100 drills a hole. At this time, the gas drives the large-particle debris produced by the inner drill bit 110 drilling a hole to enter the spiral groove 270 through the second annular channel 210, and part of the gas drives the small-particle debris produced by the outer drill bit 120 expanding a hole to pass through the space between the inner wall of the hole and the double-wall drill rod 200, thereby realizing the function of separating large and small particles, and avoiding the blockage caused by the particles passing through the spiral groove 270 only. At the same time, when the drilling is completed and sampling is required, the switch assembly blocks the communication position of the second annular channel 210 and the spiral groove 270, so that the gas is not easy to pass through the spiral groove 270, and the resistance between the inner wall of the hole and the double-wall drill rod 200 is increased. The resistance of the gas passing through the inside of the double-wall drill rod 200 is much smaller than the resistance between the inner wall of the hole and the double-wall drill rod 200, so that the gas is more likely 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 carries the sample into the inside of the sampling tail braid 300, and then the sample is discharged from the inside of the sampling tail braid 300, so that the sampling is successful, and the sampling interruption or failure is avoided.

[0045] Specifically, the switch assembly in the embodiment includes a sliding ring 240, a first channel 220 and a second channel 230, as shown in Figure 4 、 Figure 6 and Figure 10As shown, the sliding ring 240 is axially slidably arranged in the second annular passage 210 of the double-wall drill pipe 200, the first passage 220 is specifically arranged on the sidewall of the double-wall drill pipe 200, one end of the first passage 220 is communicated with the second annular passage 210, and the other end of the first passage 220 is communicated with one end of the spiral groove 270 close to the sampling drill bit 100, and the second passage 230 is also arranged on the sidewall of the double-wall drill pipe 200, but the second passage 230 is circumferentially spaced from the first passage 220, and the two passages are not located at the same position, one end of the second passage 230 is communicated with the outer periphery of the double-wall drill pipe 200, and the other end of the second passage 230 is communicated with the second annular passage 210, when the sliding ring 240 slides to block the first passage 220 in the second annular passage 210, the sliding ring 240 cannot block the second passage 230, that is, when the sliding ring 240 blocks the first passage 220, the second passage 230 is opened; similarly, when the sliding ring 240 slides to block the second passage 230 in the second annular passage 210, the sliding ring 240 cannot block the first passage 220, that is, when the sliding ring 240 blocks the second passage 230, the first passage 220 is opened.

[0046] More specifically, the second annular passage 210 in the embodiment is provided with a sliding section 250, and the sliding ring 240 is specifically slidably arranged in the sliding section 250, as shown in Figure 6 and Figure 10 As shown, the two ends of the sliding section 250 are respectively provided with a limiting rod 260, the limiting rod 260 is used to limit the sliding distance of the sliding ring 240 in the sliding section 250, so as to avoid the sliding ring 240 from being separated from the sliding section 250, the limiting rod 260 does not hinder the flow of gas in the sliding section 250, and meanwhile does not affect the passage of debris, the opening of the first passage 220 is arranged at a position close to the lower limiting rod 260, and the opening of the second passage 230 is arranged at a position close to the upper limiting rod 260, when the sliding ring 240 slides to abut against one of the limiting rods 260, the opening of the first passage 220 or the second passage 230 can be blocked.

[0047] It should be noted that the sliding power of the sliding ring 240 in the embodiment is provided by the gas introduced into the double-wall drill pipe 200. For example, when the sampling drill bit 100 drills a hole, the operator introduces gas into the inside of the sampling tail braid 300, the gas passes through the inside of the double-wall drill pipe 200, and then part of the gas passes through the first annular passage 130 between the inner drill bit 110 and the outer drill bit 120, since the first annular passage 130 is communicated with the second annular passage 210 inside the double-wall drill pipe 200, the gas pushes the sliding ring 240 to move in the sliding section 250, to block the opening of the first passage 220 or the second passage 230, as shown in Figure 6 and Figure 10After the state shown, the sliding ring 240 moves to abut against the limiting rod 260 above, 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, the gas can only enter the spiral groove 270 from the opening of the first channel 220, and when the gas passes through the first annular channel 130 between the inner drill bit 110 and the outer drill bit 120, the large particle debris drilled by the inner drill bit 110 is carried into the spiral groove 270; part of the gas will pass through the outer drill bit 120 to carry the small particle debris drilled by the outer drill bit 120 through the outside of the spiral groove 270, so that the large and small particle debris is shunted, and the frequency of blockage is reduced.

[0048] When sampling is needed, the operator introduces gas into the third annular channel 310 of the sampling tail braid 300, because the third annular channel 310 is in communication with the second annular channel 210, so the gas directly pushes the sliding ring 240 to move to the state shown as Figure 7 The sliding ring 240 moves downward to push the debris stored in the sliding section 250 out of the sliding section 250, the sliding ring 240 abuts against the limiting rod 260 below, the limiting rod 260 does not affect the debris to be discharged from the sliding section 250, and because the limiting rod 260 is small in size and cylindrical, the outer periphery of the limiting rod 260 does not store debris, and part of the debris will remain in the first channel 220, but these debris will be carried away by the gas next time sampling, and each time the position of the gas introduction is switched, the sliding ring 240 will push the debris to be separated from the sliding section 250, preventing the 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 pass through the second channel 230 into the space between the inner wall of the drill hole and the double-wall drill rod 200, because the first channel 220 is blocked, the resistance of the gas passing through the spiral groove 270 is large, so most of the gas will pass through the inner drill bit 110 from the inside of the inner drill bit 110, and then can carry the drilled sample through the inside of the double-wall drill rod 200, and finally discharged through the inside of the sampling tail braid 300 to continuously sample.

[0049] It should be noted that, as Figure 6 and Figure 7As shown, the two ends of the first channel 220 in the embodiment have a large-radius transition section instead of a right angle or a small-radius transition structure, which can optimize the flow path of the gas and the debris and reduce the risk of particle accumulation from the perspective of fluid mechanics: when the gas carrying the debris flows through the first channel 220, the large-radius transition section can avoid a sudden drop in gas flow rate and reduce particle deposition caused by sudden changes in flow rate; at the same time, the smooth transition surface has no structural dead angle, and the debris can smoothly pass through the channel under the continuous push of the gas flow and will not form accumulation due to being stuck in the corner, and the smooth inner surface of the first channel 220 can reduce the adhesion of the debris to the inner surface of the first channel 220, so that the debris is not easy to adhere to the inner surface of the first channel 220.

[0050] Specifically, the spiral groove 270 in the embodiment is composed of two mutually parallel spiral elastic sheets 271, as shown in Figure 3 and Figure 4 As shown, the two mutually parallel spiral elastic sheets 271 are perpendicular to the outer periphery of the double-wall drill pipe 200 and spirally wrapped around the outer periphery of the double-wall drill pipe 200, the two mutually parallel spiral elastic sheets 271 form the above-mentioned spiral groove 270 therebetween, the two ends of the two mutually parallel spiral elastic sheets 271 are connected to the two ends of the double-wall drill pipe 200, and the middle part of the two mutually parallel spiral elastic sheets 271 is not fixedly connected to the double-wall drill pipe 200, but the two mutually parallel spiral elastic sheets 271 abut against the outer periphery of the double-wall drill pipe 200 and can slide relative to each other, and at the same time, the spiral elastic sheet 271 has elasticity, and the distance between the two mutually parallel spiral elastic sheets 271 can be changed by being pushed by a plurality of large-particle debris, that is, the width of the spiral groove 270 is not constant, further reducing the frequency of blockage of the spiral groove 270.

[0051] It should be noted that, as shown in Figure 3 , Figure 4 and Figure 6As shown, the two-wall drill rod 200 in the embodiment is provided with a movable ring 273 axially and elastically sleeved on the end close to the sampling drill bit 100, the movable ring 273 is fixedly connected with one of the two mutually parallel spiral elastic sheets 271 closer to the movable ring 273, and the movable ring 273 is specifically fixedly connected at the lower end of the lower spiral elastic sheet 271, and the lower end of the upper spiral elastic sheet 271 is fixedly connected at the outer periphery of the two-wall drill rod 200, the lower ends of the two mutually parallel spiral elastic sheets 271 are both similar to L-shaped, that is, the lower ends of the two mutually parallel spiral elastic sheets 271 both have a vertical corner 272, the two vertical corners 272 are close to each other and are slidably connected, the diameter of the movable ring 273 is smaller than the diameter of the two mutually parallel spiral elastic sheets 271, and the inner wall of the drill hole drilled by the sampling drill bit 100 is almost attached to the two mutually parallel spiral elastic sheets 271, so that the small particle debris generated by the outer drill bit 120 can only enter the two sides of the two mutually parallel spiral elastic sheets 271, that is, the two sides of the spiral groove 270, but cannot enter the spiral groove 270, thereby ensuring that the large particle debris and the small particle debris are separated. The movable ring 273 is axially and elastically sleeved at the outer periphery of the two-wall drill rod 200, and an elastic member 274 is arranged at the sliding connection position, the elastic member 274 is a compression spring, the elastic member 274 pushes the movable ring 273 to move upward, and if a plurality of large particle debris passes between the two mutually parallel spiral elastic sheets 271 at the same time, the large particle debris will push the two mutually parallel spiral elastic sheets 271, the lower spiral elastic sheet 271 will be pushed downward to increase the distance between the two mutually parallel spiral elastic sheets 271, so that a plurality of large particle debris can pass at the same time.

[0052] In a further embodiment, a spiral support strip 280 is fixedly arranged at the outer periphery of the two-wall drill rod 200, the spiral support strip 280 is parallel to the spiral groove 270, the cross section of the spiral support strip 280 is inverted trapezoidal, the lower base length of the inverted trapezoid is shorter than the upper base length, the lower base of the inverted trapezoid is fixedly connected at the outer periphery of the two-wall drill rod 200, and the upper base of the inverted trapezoid is close to the inner wall of the drill hole, the spiral support strip 280 is almost attached to the inner wall of the drill hole to play a supporting role and prevent the drill hole from collapsing.

[0053] It should be noted that, after the spiral support strip 280 is arranged, a through groove 290 is formed between the side away from each other of the two mutually parallel spiral elastic sheets 271 and the spiral support strip 280, the through groove 290 allows the small particle debris drilled by the outer drill bit 120 to pass, and it can be understood that the spiral groove 270 between the two mutually parallel spiral elastic sheets 271 allows the large particle debris drilled by the inner drill bit 110, and the through groove 290 outside the two mutually parallel spiral elastic sheets 271 allows the small particle debris drilled by the outer drill bit 120, thereby realizing the particle size separation function.

[0054] Specifically, in order to improve the supporting strength of the spiral supporting strip 280, a plurality of supporting rods 281 are arranged on the side edges of the spiral supporting strip 280, one end of the plurality of supporting rods 281 is fixedly connected to the outer periphery of the double-wall drill rod 200, and the other end of the plurality of supporting rods 281 is fixedly connected to the side edges of the spiral supporting strip 280.

[0055] It should be noted that the plurality of supporting rods 281 are specifically located in the through grooves 290 on both sides of the spiral groove 270. Since the through grooves 290 pass only small particle debris generated by the outer drill bit 120, the arrangement of the plurality of supporting rods 281 has little effect on the small particle debris passing through the through grooves 290, which can be ignored.

[0056] In further embodiments, in order to facilitate the passage of gas from the inside of the sampling tail braid 300 or the third annular channel 310, the present embodiment is provided with a first gas inlet channel 320 and a second gas inlet channel 330 on the end of the sampling tail braid 300 away from the double-wall drill rod 200, as shown in Figure 2 and Figure 9 The first gas inlet channel 320 communicates with the third annular channel 310 of the sampling tail braid 300, and the second gas inlet channel 330 communicates with the inside of the sampling tail braid 300. When the sampling drill bit 100 is needed to drill a hole, the operator connects the interface of the gas pump (not shown in the figure) to the second gas inlet channel 330, and the gas enters the inside of the sampling tail braid 300; when sampling is needed, the operator connects the interface of the gas pump to the first gas inlet channel 320, and the gas enters the third annular channel 310 of the sampling tail braid 300.

[0057] The specific working process of a sampling device for mineral geological exploration provided by the present application is described in combination with the above embodiments:

[0058] Drilling a hole:

[0059] The operator drives the double-wall drill rod 200 to rotate the sampling drill bit 100 at high speed, simultaneously connects the interface of the gas pump (not shown in the figure) to the second gas inlet channel 330, and the gas enters the inside of the sampling tail braid 300, and then passes through the inside of the double-wall drill rod 200 from the inside of the inner drill bit 110 of the sampling drill bit 100. The operator aims the sampling drill bit 100 at the position where the hole is needed to be drilled, and the inner drill bit 110 and the outer drill bit 120 of the sampling drill bit 100 rotate at high speed. Since the inner drill bit 110 protrudes from the outer drill bit 120, the inner drill bit 110 starts to drill a hole, and the diameter of the outer drill bit 120 is greater than that of the inner drill bit 110, so as to ream the hole drilled by the inner drill bit 110. In the process of drilling, the inner drill bit 110 generates large particle debris, and the outer drill bit 120 is a reaming drill bit, so it generates small particle debris. The large particle debris enters the second annular channel 210 of the double-wall drill rod 200 through the first annular channel 130 between the inner drill bit 110 and the outer drill bit 120 under the action of part of the gas, and simultaneously,Figure 6 As shown, the gas pushes the sliding ring 240 in the second annular channel 210 to move 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 particle debris through the opening of the first channel 220 to enter the spiral groove 270 outside the double-wall drill rod 200; At the same time, part of the gas will pass through the inside of the inner drill bit 110 and enter the space between the drill hole and the double-wall drill rod 200 from the outer drill bit 120, and this part of the gas will carry the small particle debris generated by the outer drill bit 120 into the through groove 290 on both sides of the spiral groove 270, realizing the function of large particle debris and small particle debris diversion, thereby reducing the frequency of blockage.

[0060] Sampling:

[0061] When the sampling drill bit 100 completes the drilling and starts sampling, the operator connects the interface of the gas pump to the first gas inlet channel 320, and the gas enters the third annular channel 310 of the sampling tail braid 300, at this time the double-wall drill rod 200 still needs to drive the sampling drill bit 100 to rotate at high speed to drill samples, and the gas enters the second annular channel 210 through the third annular channel 310, as shown, Figure 7 The gas pushes the sliding ring 240 to slide downward in the sliding section 250 to the limiting rod 260 below, and the sliding ring 240 can discharge the debris in the sliding section 250 when it slides downward, at this time the sliding ring 240 blocks the opening of the first channel 220 and opens the opening of the second channel 230, the gas enters the space between the outer periphery of the double-wall drill rod 200 and the inner wall of the drill hole from the opening of the second channel 230, because the first channel 220 is blocked, the spiral groove 270 cannot pass through large particle debris, and it is also difficult for the gas to pass through the spiral groove 270, so most of the gas is discharged from the second channel 230, passes through the outer drill bit 120 of the sampling drill bit 100, enters the inside of the double-wall drill rod 200 through the inside of the inner drill bit 110, at this time the gas will carry the drilled samples into the inside of the double-wall drill rod 200, then the gas carries the samples into the inside of the sampling tail braid 300, and finally discharges from the inside of the sampling tail braid 300, thereby implementing continuous sampling operation, avoiding sampling interruption and sampling failure.

[0062] The technical features of the above embodiments can be combined in any way. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0063] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to 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; The switching assembly includes a sliding ring, a first channel, and a second channel. The sliding ring is axially slidably disposed in 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. 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.

2. 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.

3. The sampling device for mineral geological exploration according to claim 2, 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.

4. The sampling device for mineral geological exploration according to claim 2, 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.

5. The sampling device for mineral geological exploration according to claim 4, 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.

6. The sampling device for mineral geological exploration according to claim 4, 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.

7. The sampling device for mineral geological exploration according to claim 1, characterized in that, The sampling tail brace 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.

8. 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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