A core sampling device for mineral geological exploration

Abstract

The present application relates to the technical field of core sampling, in particular to a core sampling device for mineral geological exploration, which comprises a drilling machine body, a core extraction device is arranged on the drilling machine body, a plurality of rotary tubes are arranged on the core extraction device, a drill bit is arranged at the bottom of the first rotary tube, a limiting assembly is arranged at the top of the drill bit, an inner tube is arranged in the rotary tube, a chuck is fixedly arranged at the top of the inner tube, a lifting hook device is detachably arranged at the top of the chuck, a butt joint sleeve head is rotatably arranged at the bottom of the inner tube, a plurality of sets of cutting assemblies are circumferentially arranged in the butt joint sleeve head, a plurality of sets of clamping assemblies are circumferentially arranged outside the butt joint sleeve head, and a plurality of sets of centering assemblies are circumferentially arranged outside the inner tube; by integrating three function modules of automatic decoring, in-situ cutting and dynamic centering, a closed-loop efficient coring system is formed, which not only overcomes the technical bottleneck of easy damage and poor decoring of the core in the traditional device, but also greatly improves the automation degree of coring operation and the sample integrity.

Description

TECHNICAL FIELD

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

[0002] The core sampling device for mineral geological exploration is used for efficiently and completely obtaining a cylindrical core sample from an underground rock layer, and then cutting and sampling the core sample.

[0003] In the prior art, the core sampling device is usually used to extract the core sample after drilling to a predetermined depth. However, when the core sample is long, the core sample is prone to be broken due to its own weight or vibration during lifting, which damages the integrity of the core sample, affects the sampling rate and sample representativeness, and further causes deviation of geological data. Some devices use a segmented core sampling method to reduce the risk, but when the core sampling tube is filled with the core sample, the device still has obvious technical defects. On the one hand, the device lacks an effective core cutting mechanism, and it is difficult to accurately separate the obtained core segment at the bottom of the hole. On the other hand, the separation mechanism between the core sampling inner tube and the outer drill rod is not reasonably designed, which makes it difficult to decouple or unreliable, significantly increasing the risk of core sampling failure, affecting the operation efficiency and sampling quality.

[0004] Based on this, the present application discloses a core sampling device for mineral geological exploration. SUMMARY

[0005] To solve the problem of the core sampling device in the background art, which is prone to cause the long core sample to be broken or the lifting to fail due to the lack of an effective core cutting and core sampling tube quick decoupling mechanism, and affects the integrity of the core sample and the reliability of the sampling, the present application provides a core sampling device for mineral geological exploration, which comprises a drilling machine body, a core extraction device is arranged on the drilling machine body, a plurality of rotary tubes are arranged on the core extraction device, a drill bit is arranged at the bottom of the first rotary tube, a limiting assembly is arranged at the top of the drill bit, an inner tube is arranged in the rotary tube, a chuck is fixedly arranged at the top of the inner tube, a lifting hook device is detachably arranged at the top of the chuck, a butt joint sleeve head is rotatably arranged at the bottom of the inner tube, a plurality of sets of cutting assemblies are circumferentially arranged in the butt joint sleeve head, a plurality of sets of clamping assemblies are circumferentially arranged outside the butt joint sleeve head, and a plurality of sets of centering assemblies are circumferentially arranged outside the inner tube.

[0006] In order to facilitate the butt joint and disengagement of the inner tube and the drill bit when the inner tube is butt jointed in the rotating tube, the technical scheme adopts that the inner tube is slidably provided with a coring tube, the limiting assembly includes a mounting tube provided at the top of the drill bit, the top of the mounting tube is provided with a tapered butt joint, the mounting tube, the clamping ring, the butt joint, the butt joint sleeve and the center of the coring tube are all provided with a sliding cavity with an inner diameter matched with the core sample, wherein a plurality of clamping rings are fixedly arranged on the mounting tube, and the clamping ring is in an inverted tapered structure;

[0007] As a further improvement of the technical scheme, the clamping assembly includes a clamping rod, the clamping rod is rotatably arranged on the butt joint sleeve through a torsion spring, and the clamping rod is unfolded with the rising of the coring tube; furthermore, a tapered groove matched with the structure of the butt joint is formed in the butt joint sleeve, the clamping assembly further includes a protective sleeve, the protective sleeve is fixedly arranged on the butt joint sleeve, a first rack is slidably arranged in the protective sleeve, a first mounting rod is rotatably arranged in the bottom of the butt joint sleeve, a first gear is fixedly arranged on the first mounting rod, the first gear is engaged with the first rack, a first torsion spring is arranged on the first mounting rod, the first mounting rod is connected with the butt joint sleeve through the first torsion spring, and the clamping rod is fixedly arranged on the first mounting rod;

[0008] A plurality of limiting plates corresponding to the clamping rings are fixedly arranged on the clamping rod, and a plurality of rolling balls are rotatably arranged on the top of the limiting plate; the first torsion spring always has a tendency to make the plurality of clamping rods inwardly retract and make the limiting plate fit with the corresponding clamping ring;

[0009] The bottom of the clamping rod is a smooth structure, the bottom of the front end of the limiting plate is a smooth structure, and the periphery of the clamping ring is a smooth structure;

[0010] A first sliding groove corresponding to the first rack is formed in the bottom of the outer portion of the inner tube, a control ring is slidably arranged on the periphery of the inner tube, the control ring is fixedly connected with the coring tube, and the control ring is slidably connected in the first sliding groove through a connecting rod;

[0011] Furthermore, the bottom of the top end of the first rack always fits with the top of the control ring, and when the control ring drives the first rack to fit with the top of the first sliding groove, the top of the coring tube fits with the inner wall of the top of the inner tube.

[0012] On this basis, after the core sample is completed, the inner tube needs to be disengaged and disassembled, and then the bottom core sample is cut off and taken out as a whole. In the process of taking out the inner tube, it is not easy to directly disengage, and the bottom of the core is still in a connected state during the disengagement process. Directly taking out the inner tube can easily damage the core sample. Therefore, the present application adopts an automatic disengagement mode when the core sample is filled in the coring tube during the core sampling process, and then the inner tube can be directly taken out.

[0013] As a further improvement of the technical solution, the cutting assembly further comprises a first accommodating groove opened on the inner wall of the tapering groove of the butt joint sleeve head, a second mounting rod is rotatably arranged in the first accommodating groove, a torsional spring is arranged on the second mounting rod, the second mounting rod is connected with the inner wall of the first accommodating groove through the torsional spring, the mounting plate is fixedly arranged on the second mounting rod, and the torsional spring has a tendency to always make the mounting plate be in a vertical state; the front end edge of the cutting knife is sharp, and the cutting knife is in a wave shape.

[0014] In another scheme, in order to increase the stability of the inner tube during the process of hooking out the inner tube and prevent the inner tube from colliding with the hole wall to damage the sample, the inner tube is kept in sliding contact with the hole wall through the centering assembly during the process of hooking out the inner tube, so as to keep the inner tube in a stable state as much as possible during the process of hooking out.

[0015] As a further improvement of the technical solution, the centering assembly further comprises a second accommodating groove opened on the outer wall of the inner tube and a second rack fixedly arranged on the outer wall of the coring tube, a second gear is rotatably arranged at the bottom of the second accommodating groove, the second gear is fixedly connected with the positioning rod, the second rack is engaged with the second gear, and a roller is rotatably arranged at the top of the positioning rod.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. In the core sampling device for mineral geological exploration, the slidable inner tube is arranged in butt joint with the drill bit having a reverse taper clamping ring, and the automatic opening and closing mechanism of the limiting clamping assembly is arranged, so that reliable connection between the inner lining pipe and the drill bit is realized during drilling, and stable core sampling operation is ensured; after the core is filled, the inner tube is lifted up by the core, the clamping assembly is automatically released, the locking on the drill bit is released, the automatic separation of the core sampling unit and the drilling tool is realized without external operation, the operation complexity and failure risk caused by the traditional whole trip or manual intervention are avoided, and the core sampling efficiency and reliability are significantly improved.

[0018] 2. In the core sampling device for mineral geological exploration, the cutting assembly having an elastic reset member is arranged in the inner wall of the butt joint sleeve, when the core sampling unit is lifted up and starts to separate from the drill bit, the cutting blade is automatically ejected under the action of the torsional spring and is attached to the outer wall of the core, and the bottom of the core is dynamically cut under the action of the continuous rotation of the drill bit. Combined with the wave-shaped blade design, the core produces local cracks and is finally broken under the action of alternating stress, or a weak belt is formed, so that the complete sample is smoothly taken out, the long core is effectively prevented from being broken due to whole stretching, and the continuity and representativeness of the core are ensured.

[0019] 3. The core sampling device for mineral geological exploration, wherein the central supporting assembly driven by the gear and the rack is arranged on the outer periphery of the coring tube, during the process of the coring completion and the lifting of the inner tube, the lifting action of the coring tube synchronously drives the support arm to expand outward, so that the end roller is in contact with the hole wall, and automatic expansion positioning before lifting is realized; the inner tube can always keep in the central state when being lifted by the hook, the collision and shaking with the hole wall are reduced, the stability of the lifting process is greatly improved, the risk of damage of the core in the extraction process due to mechanical disturbance is reduced, and the high sampling rate and sample quality are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0021] Figure 2 It is a schematic diagram of the structure of the rotating tube of the present application;

[0022] Figure 3 It is a sectional view of the structure of the rotating tube of the present application;

[0023] Figure 4 It is Figure 3 It is an enlarged view of the structure at A;

[0024] Figure 5 It is a schematic diagram of the structure of the inner tube of the present application;

[0025] Figure 6 It is a sectional view of the structure of the inner tube of the present application;

[0026] Figure 7 It is a schematic diagram of the state of the coring tube of the present application;

[0027] Figure 8 It is a schematic diagram of the state of the coring tube of the present application;

[0028] Figure 9 It is a schematic diagram of the structure of the cutting-off knife of the present application;

[0029] Figure 10 It is a schematic diagram of the structure of the clamping rod of the present application.

[0030] The meanings of the respective reference numerals in the drawings are as follows:

[0031] 1, drill body; 2, core extraction device; 3, rotating tube; 4, drill bit; 5, inner tube; 6, chuck; 7, hook device; 8, limiting assembly; 9, butt joint sleeve; 10, clamping assembly; 11, cutting-off assembly; 12, centering assembly; 13, coring tube;

[0032] 81, mounting tube; 82, clamping ring; 83, butt joint;

[0033] 101, protective sleeve; 102, first rack; 103, first mounting rod; 104, first torsion spring; 105, first gear; 106, clamping rod; 107, limiting plate; 108, ball; 109, control ring; 1010, first sliding groove;

[0034] 111, first accommodating groove; 112, second mounting rod; 113, mounting plate; 114, cutting knife;

[0035] 121, second accommodating groove; 122, second rack; 123, second gear; 124, positioning rod; 125, roller. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] The existing core sampling device is prone to cause long core fracture or pulling failure during coring, which affects the core integrity and sampling reliability due to the lack of effective core cutting and coring pipe 13 quick unblocking mechanism.

[0038] Therefore, the present application provides a core sampling device for mineral geological exploration, as shown in Figures 1-5 The device includes a drilling machine body 1, a core extraction device 2 arranged on the drilling machine body 1, a plurality of rotating pipes 3 arranged on the core extraction device 2, a drill bit 4 arranged at the bottom of the first rotating pipe 3, a limiting assembly 8 arranged at the top of the drill bit 4, an inner pipe 5 arranged in the rotating pipe 3, a clamp head 6 fixedly arranged at the top of the inner pipe 5, a lifting hook device 7 detachably arranged at the top of the clamp head 6, a butt joint sleeve head 9 rotatably arranged at the bottom of the inner pipe 5, a plurality of sets of cutting assemblies 11 arranged in the butt joint sleeve head 9 in a circumferential direction, a plurality of sets of clamping assemblies 10 arranged on the outside of the butt joint sleeve head 9 in a circumferential direction, and a plurality of sets of centering assemblies 12 arranged on the outside of the inner pipe 5 in a circumferential direction.

[0039] When working, the bottom of the rotating pipe 3 of the first section is connected with the drill bit 4, then the inner pipe 5 is put into the rotating pipe 3, the rotating pipe 3 is driven to rotate by the corresponding driving device of the drilling machine body 1, the drill bit 4 is driven to drill by the rotating pipe 3, the inner pipe 5 is finally clamped at the bottom of the rotating pipe 3 through the connecting sleeve 9 and the clamping assembly 10 on the connecting sleeve 9, but in order to keep the inner pipe 5 as still as possible, the connecting sleeve 9 and the drill bit 4 are movably connected, and the connecting sleeve 9 and the inner pipe 5 are rotatably connected, then the core sampling work is started, after the first section core sampling is successful, the inner pipe 5 is hooked out by the clamping head 6 and the hook device 7, then the core sample is taken out, then the second section rotating pipe 3 is connected, then the inner pipe 5 is put in for connection, and so on.

[0040] Specifically, as shown in Figures 6-7 and Figure 10 In order to facilitate the connection and disconnection of the inner pipe 5 and the drill bit 4 when the inner pipe 5 is connected in the rotating pipe 3, the core taking pipe 13 is slidably arranged in the inner pipe 5, the limiting assembly 8 comprises the mounting pipe 81 arranged at the top of the drill bit 4, the taper-shaped connecting head 83 is arranged at the top of the mounting pipe 81, the center of the mounting pipe 81, the clamping ring 82, the connecting head 83, the connecting sleeve 9 and the core taking pipe 13 is provided with a sliding cavity with an inner diameter matched with the core sample, and a plurality of clamping rings 82 are fixedly arranged on the mounting pipe 81, and the clamping ring 82 is in an inverted taper structure.

[0041] Secondly, the clamping assembly 10 comprises the clamping rod 106, the clamping rod 106 is rotatably arranged on the connecting sleeve 9 through the torsional spring, and the clamping rod 106 is unfolded with the rising of the core taking pipe 13; and the connecting sleeve 9 is provided with a taper-shaped groove matched with the structure of the connecting head 83, the clamping assembly 10 further comprises the protective sleeve 101, the protective sleeve 101 is fixedly arranged on the connecting sleeve 9, the first rack 102 is slidably arranged in the protective sleeve 101, the first mounting rod 103 is rotatably arranged in the bottom of the connecting sleeve 9, the first gear 105 is fixedly arranged on the first mounting rod 103, the first gear 105 is engaged with the first rack 102, the first torsional spring 104 is arranged on the first mounting rod 103, the first mounting rod 103 is connected with the connecting sleeve 9 through the first torsional spring 104, and the clamping rod 106 is fixedly arranged on the first mounting rod 103.

[0042] In addition, a plurality of limiting plates 107 corresponding to the clamping rings 82 are fixedly arranged on the clamping rod 106, and a plurality of ball bearings 108 are rotatably arranged on the top of the limiting plate 107; the first torsional spring 104 always has the tendency to make the plurality of clamping rods 106 inwardly close and make the limiting plate 107 abut against the corresponding clamping ring 82.

[0043] It needs to be explained that the bottom of the clamping rod 106 is a smooth structure, the bottom of the front end of the limiting plate 107 is a smooth structure, and the periphery of the clamping ring 82 is a smooth structure;

[0044] In addition, the outer bottom of the inner tube 5 is provided with a first sliding groove 1010 corresponding to the first rack 102, and the control ring 109 is slidably arranged on the periphery of the inner tube 5 and fixedly connected with the core tube 13. The control ring 109 is slidably connected in the first sliding groove 1010 through the connecting rod;

[0045] Moreover, the top end of the first rack 102 is always in close contact with the top of the control ring 109, and when the control ring 109 drives the first rack 102 to be in close contact with the top of the first sliding groove 1010, the top of the core tube 13 is in close contact with the inner wall of the top of the inner tube 5.

[0046] In specific work, when the inner tube 5 is hooked and lowered by the clamp head 6 and the hook device 7, in the initial state, due to the action of the first torsional spring 104, the plurality of clamping rods 106 are in a state of approaching each other, and at this time, due to the action of gravity, the core tube 13 is located at the bottom of the inner tube 5, that is, the control ring 109 is also located at the bottom of the first sliding groove 1010, and the top of the first rack 102 is also transversely located at the bottom of the first sliding groove 1010 and in close contact with the control ring 109 above it. Then, as the inner tube 5 continues to fall, until the bottoms of the plurality of clamping rods 106 begin to contact the butt joint 83, due to the action of gravity and the slow release of the drilling machine body 1, the inner tube 5 drives the clamping rod 106 to move on the tapered slope of the butt joint 83. Since the butt joint 83 is a tapered structure and the bottom of the clamping rod 106 is a smooth structure, as the inner tube 5 continues to fall, the plurality of clamping rods 106 will be spread apart, and then the tapered groove of the butt joint sleeve 9 will also fall onto the butt joint 83. Through the mutually matched tapered structures, the effect of central butt joint can be achieved, which is convenient for the butt joint of the butt joint sleeve 9 and the butt joint 83. When the butt joint sleeve 9 and the butt joint 83 complete the butt joint process, the clamping rod 106 will first pass the slope of the butt joint 83, and then enter the position of the mounting tube 81. Then, under the torsional force of the first torsional spring 104, the plurality of clamping rods 106 begin to gather, and then, since the end of the limiting plate 107 is also a smooth structure, and the clamping ring 82 is an inverted tapered structure and the periphery edge is also a smooth structure, each limiting plate 107 will gradually pass the plurality of clamping rings 82, until the tapered groove of the butt joint sleeve 9 and the butt joint 83 are completely in close contact, at which time the plurality of limiting plates 107 enter the lower part of the corresponding clamping ring 82 to form a limiting clamping structure, that is Figure 6 the case shown in the middle;

[0047] And since the installation pipe 81 is driven by the drill bit 4 to rotate, the ball 108 on the limiting plate 107 can play a role in protecting the limiting plate 107, and the torsion of the first torsion spring 104 is sufficient to overcome the resistance caused by the meshing between the first rack 102 and the first gear 105, that is, when the clamping rod 106 sweeps through the butt joint 83, the clamping rods 106 are in a state of first unfolding and then gathering, and the first gear 105 and the first rack 102 are always in meshing state, so as to drive the first rack 102 to first rise and then fall, and finally when the limiting plate 107 is clamped below the corresponding clamping ring 82, the first rack 102 returns to the initial state, that is, above the control ring 109 and adheres;

[0048] It should be noted that the protective sleeve 101 can also protect the first rack 102 and the first gear 105 from falling debris affecting the meshing between the first gear 105 and the first rack 102.

[0049] Further, referring to Figures 6-9 When the core sample is completed, the inner tube 5 needs to be disconnected and disassembled, and then the bottom core sample is cut off and hooked out as a whole. In the process of hooking out the inner tube 5, it is not easy to directly disconnect in the traditional way, and the core bottom is still in a connected state during the disconnection process. By directly hooking out, the core sample is easily damaged. Therefore, the present application adopts an automatic disconnection mode when the core sample is filled in the coring tube 13 during the core sampling process, and then the inner tube 5 is directly hooked out. Specifically, the cutting assembly 11 further comprises a first accommodating groove 111 opened on the inner wall of the tapered groove of the butt joint head 9, a second mounting rod 112 is rotatably arranged in the first accommodating groove 111, a torsion spring is arranged on the second mounting rod 112, the second mounting rod 112 is connected with the inner wall of the first accommodating groove 111 through the torsion spring, and a mounting plate 113 is fixedly arranged on the second mounting rod 112. The torsion spring has a tendency to always keep the mounting plate 113 in a vertical state.

[0050] Secondly, the front end edge of the cutting knife 114 is sharp, and the cutting knife 114 is in a wave shape.

[0051] When the docking sleeve 9 and the docking head 83 are docked, the bottom of the mounting plate 113 will be in contact with the inclined surface of the docking head 83 as the docking sleeve 9 moves downward, and then the mounting plate 113 will rotate into the first receiving groove 111 under the action of the inclined surface of the docking head 83, and the same is true for the cutting knife 114. As the docking sleeve 9 continues to descend, the mounting plate 113 and the cutting knife 114 are finally squeezed and contained in the first receiving groove 111. During this process, the bottom of the mounting plate 113 is smooth, which facilitates the rotation of the mounting plate 113 into the first receiving groove 111. During the subsequent rotation of the drill bit 4 driven by the docking head 83, the cutting knife 114 is made of a special material and the surface of the docking head 83 is smooth, so the contact between the cutting knife 114 and the docking head 83 will not cause direct wear.

[0052] During the drilling operation:

[0053] First state: that is Figure 6 at this time, the core sample is continuously drilled by the drill bit 4, and the core sample begins to pass through the sliding cavity of the drill bit 4, the mounting tube 81, the clamping ring 82, and the docking head 83, and gradually enters the sliding cavity of the core tube 13;

[0054] Second state: as the drill bit 4 continues to drill, the core gradually fills the core tube 13, and when the core fills the core tube 13, it is the second state;

[0055] Third state: then the drill bit 4 continues to drill, and the core continues to enter the core tube 13. Then, since the core tube 13 is slidingly connected to the inner tube 5, the core tube 13 will be gradually lifted by the core sample entering the core tube 13, until the core tube 13 contacts the inner wall of the inner tube 5;

[0056] During this process, since the core tube 13 will be lifted, as the core tube 13 is lifted, the control ring 109 will drive the first rack 102 to move upward, and the upward movement of the first rack 102 will drive the clamping rod 106 to expand, thereby releasing the clamping of the clamping rod 106 and the limiting plate 107 on the clamping ring 82, until the core tube 13 is attached to the inner wall of the inner tube 5. At this time, the control ring 109 is attached to the top of the first sliding groove 1010, and at this time, the limiting plate 107 is also completely separated from the clamping ring 82, and the edge of the clamping rod 106 will not contact the docking head 83 on the vertical line, so it will not affect the subsequent upward movement of the inner tube 5 as a whole;

[0057] The fourth state: since the top inner wall of the inner tube 5 and the coring tube 13 have been attached, the whole inner tube 5 will be lifted up as the core sample continuously enters the coring tube 13, so the limiting plate 107 no longer limits the clamping ring 82, and at this time, the inner tube 5 can be lifted up as a whole; during the lifting of the inner tube 5, the tapered groove of the adapter sleeve head 9 will gradually be separated from the adapter head 83, at this time, the mounting plate 113 and the cutting knife 114 are gradually released from the first containing groove 111 under the action of the torsional spring, and finally in a vertical state;

[0058] When the cutting knife 114 gradually becomes vertical, the cutting knife 114 will be in contact with the core sample, and the core sample will rotate under the driving of the drill bit 4, so that the cutting knife 114 can cut the core sample in a notch. The cutting knife 114 is a wave structure, so each rotation cutting will cause the core sample to be squeezed up and down at the notch cutting position, and finally cause the core sample to be broken. Even if the breakage does not occur, the core sample will have a clear notch breakage zone after being damaged by the wave structure cutting knife 114, so during the hooking out process, this position is very fragile and can easily be taken out.

[0059] It should be noted that the lifting distance is very small, so the damage to the core sample caused by the cutting of the cutting knife 114 can be ignored.

[0060] Further, referring to Figures 6-8 In order to increase the stability of the inner tube 5 during the hooking out process and prevent the inner tube 5 from colliding with the hole wall and causing sample damage, the present application adopts the method of keeping the inner tube 5 in sliding contact with the hole wall through the centering assembly 12 during the hooking out process, so as to keep the inner tube 5 in a stable state as much as possible during the hooking out process. Specifically, the centering assembly 12 further comprises a second containing groove 121 provided on the outer wall of the inner tube 5 and a second rack 122 fixedly arranged on the outer wall of the coring tube 13, the second containing groove 121 is rotatably provided with a second gear 123 at the bottom, the second gear 123 and a positioning rod 124 are fixedly connected, the second rack 122 and the second gear 123 are engaged, the positioning rod 124 is rotatably provided with a roller 125 at the top, and in the initial state, the positioning rod 124 is located in the second containing groove 121.

[0061] When the third state is entered, the coring tube 13 is lifted, and the positioning rods 124 are turned outward by the second rack 122 fixed on the outer wall of the coring tube 13, and when the coring tube 13 is attached to the inner wall of the top end of the inner tube 5, the positioning rods 124 are in a fully expanded state, that is, the positioning rods 124 are in contact with the hole wall through the rollers 125, so that the inner tube 5 is supported by the positioning rods 124 during the subsequent hooking-out process, and the rollers 125 are rotating, thereby reducing the friction, and the positioning rods 124 ensure the stability of the inner tube 5 during the hooking-out process, and ensure that the core sample does not swing greatly.

[0062] When the coring is completed and the coring tube 13 is put back, the coring tube 13 is reset to the bottom of the inner tube 5 under the action of gravity, and the positioning rods 124 are also reset to the second accommodating groove 121.

[0063] It should be noted that the debris between the inner tube 5 and the rotating tube 3 and the debris between the rotating tube 3 and the hole wall will be watered and pumped by special cooling and slag removal devices, and these devices are prior art and are practical processes in drilling technology, and are not the improvement scheme of the present application, so they will not be described in detail; secondly, a monitoring device is usually designed near the drill bit, and when the core sample is broken and taken out, the drill bit 4 will stop running.

[0064] In summary, by designing the coring tube as an axially sliding trigger element, the thrust generated after the core is filled in place is ingeniously used as a power source to realize a series of operations such as decarburization, truncation and centering support, forming a complete automatic coring closed loop; specifically, through the elastic clamping structure between the inner tube 5 and the drill bit 4, stable connection in the coring state and automatic unlocking after full load are realized; by setting the elastic and expandable wavy blade truncation assembly at the butt joint part, rotary cutting of the bottom of the core is implemented during the disengagement process, effectively avoiding the risk of whole long core breaking, and ensuring the sample integrity; at the same time, through the centering support mechanism of the gear and rack linkage, the inner tube is automatically expanded and attached to the hole wall before lifting, which significantly improves the stability of the inner tube lifting process and reduces the core disturbance; and effectively solves the problem that the existing core sampling device lacks effective core truncation and rapid decarburization mechanism of the coring tube 13 during the coring process, which easily leads to long core breaking or pulling failure, affecting the core integrity and sampling reliability.

[0065] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.

[0066] While the embodiments of the application have been shown and described herein, it will be understood by those skilled in the art that many changes, modifications, substitutions and alterations to these embodiments can be made without departing from the principles and spirits of the application, and it is intended that the scope of the application be limited solely by the scope of the appended claims and the equivalents thereof.

Claims

1. A core sampling device for mineral geological exploration, comprising a drilling rig body (1), a core extraction device (2) mounted on the drilling rig body (1), a plurality of rotating tubes (3) mounted on the core extraction device (2), and a drill bit (4) mounted at the bottom of the first rotating tube (3), characterized in that: The drill bit (4) top is provided with a limiting assembly (8), a rotating pipe (3) is provided with an inner pipe (5), the inner pipe (5) bottom is rotatably provided with a butt joint sleeve head (9), the butt joint sleeve head (9) is provided with a plurality of sets of cutting assembly (11) in the circumferential direction, the butt joint sleeve head (9) is provided with a plurality of sets of clamping assembly (10) in the circumferential direction, the inner pipe (5) is provided with a plurality of sets of centering assembly (12) in the circumferential direction; Wherein, the inner pipe (5) is slidably provided with a coring pipe (13), the limiting assembly (8) includes an installation pipe (81) provided on the top of the drill bit (4), and the installation pipe (81) is provided with a tapered structure of the butt joint (83) on the top; The clamping assembly (10) includes a clamping rod (106), which is rotatably provided on the butt joint sleeve head (9) by a torsion spring, and the clamping rod (106) is unfolded with the rising of the coring pipe (13); The cutting assembly (11) includes a mounting plate (113), and the mounting plate (113) is fixedly provided with a cutting knife (114) towards the center of the butt joint sleeve head (9), and the mounting plate (113) is rotatably provided on the inner wall of the butt joint sleeve head (9) by a torsion spring; The centering assembly (12) includes a positioning rod (124), which is rotatably provided in the outer wall of the inner pipe (5), and the positioning rod (124) is unfolded with the rising of the coring pipe (13); A plurality of clamping rings (82) are fixedly provided on the installation pipe (81), and the clamping ring (82) is in inverted tapered structure; The installation pipe (81), the clamping ring (82), the butt joint (83), the butt joint sleeve head (9) and the coring pipe (13) are all provided with a sliding cavity with an inner diameter matched with the core sample in the center; The butt joint sleeve head (9) is provided with a tapered groove matched with the structure of the butt joint (83), and the clamping assembly (10) further includes a protective sleeve (101), which is fixedly provided on the butt joint sleeve head (9), and the protective sleeve (101) is slidably provided with a first rack (102) in the protective sleeve (101), and the butt joint sleeve head (9) is rotatably provided with a first mounting rod (103) in the bottom, and the first mounting rod (103) is fixedly provided with a first gear (105), and the first gear (105) is engaged with the first rack (102), and the first mounting rod (103) is provided with a first torsion spring (104), and the first mounting rod (103) is connected with the butt joint sleeve head (9) by the first torsion spring (104), and the clamping rod (106) is fixedly provided on the first mounting rod (103); The inner pipe (5) is provided with a first sliding groove (1010) corresponding to the first rack (102) in the outer bottom, and the inner pipe (5) is slidably provided with a control ring (109) around the periphery, and the control ring (109) is fixedly connected with the coring pipe (13), and the control ring (109) is slidably connected in the first sliding groove (1010) through a connecting rod; The top end of the first rack (102) is always in contact with the top of the control ring (109), and when the control ring (109) drives the first rack (102) to be in contact with the top of the first sliding groove (1010), the top of the coring pipe (13) is in contact with the inner wall of the top of the inner pipe (5).

2. The core sampling device for mineral geological exploration according to claim 1, characterized in that: The inner tube (5) top is fixed with a clamp (6), and the clamp (6) top is detachably provided with a lifting hook device (7).

3. The core sampling device for mineral geological exploration according to claim 1, characterized in that: A plurality of limiting plates (107) corresponding to the clamping rings (82) are fixed on the clamping rods (106), and a plurality of ball bearings (108) are rotatably arranged on the top of the limiting plates (107).

4. The core sampling device for mineral geological exploration according to claim 3, characterized in that: The first torsion spring (104) always has a tendency to make the plurality of clamping rods (106) inwardly retract and make the limiting plates (107) abut against the corresponding clamping rings (82). The bottom of the clamping rod (106) is a smooth structure, the bottom of the front end of the limiting plate (107) is a smooth structure, and the periphery of the clamping ring (82) is a smooth structure.

5. The core sampling device for mineral geological exploration according to claim 4, characterized in that: The cutting assembly (11) further comprises a first accommodating groove (111) opened on the inner wall of the taper groove of the butt joint sleeve head (9), a second mounting rod (112) rotatably arranged in the first accommodating groove (111), a torsion spring arranged on the second mounting rod (112), the second mounting rod (112) connected with the inner wall of the first accommodating groove (111) through the torsion spring, and the mounting plate (113) fixed on the second mounting rod (112). The torsion spring has a tendency to always make the mounting plate (113) in a vertical state.

6. The core sampling device for mineral geological exploration according to claim 5, characterized in that: The front end edge of the cutting knife (114) is sharp, and the cutting knife (114) is in a wave shape.

7. The core sampling device for mineral geological exploration according to claim 6, characterized in that: The centering assembly (12) further comprises a second accommodating groove (121) opened on the outer wall of the inner tube (5) and a second rack (122) fixed on the outer wall of the core tube (13). The second accommodating groove (121) is rotatably provided with a second gear (123) at the bottom, the second gear (123) and the positioning rod (124) are fixedly connected, the second rack (122) and the second gear (123) are engaged, and the positioning rod (124) is rotatably provided with a roller (125) at the top. In the initial state, the positioning rod (124) is located in the second accommodating groove (121).

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