Rock core sampling device for mineral geological exploration

Abstract

The invention relates to the technical field of rock core sampling, in particular to a rock core sampling device for mineral geological exploration, which comprises a drilling machine body, a rock core extraction device is arranged on the drilling machine body, a plurality of sections of rotating pipes are arranged on the rock core extraction device, a drill bit is arranged at the bottom of the first section of rotating pipe, and a limiting assembly is arranged at the top of the drill bit. An inner pipe is arranged in the rotating pipe, a clamping head is fixedly arranged at the top of the inner pipe, a lifting hook device is detachably arranged at the top of the clamping head, a butt joint sleeve head is rotationally arranged at the bottom of the inner pipe, a plurality of cutting assemblies are circumferentially arranged in the butt joint sleeve head, a plurality of clamping assemblies are circumferentially arranged outside the butt joint sleeve head, and a plurality of centering assemblies are circumferentially arranged outside the inner pipe; a set of closed-loop efficient coring system is formed by integrating the three functional modules of automatic clamping removal, in-situ truncation and dynamic centering, the technical bottlenecks that a rock core is prone to being damaged and clamping removal is not smooth in a traditional device are overcome, and the automation degree of coring operation and the integrity of a sample are greatly improved.

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 coring method to reduce the risk, but when the coring tube is filled with the core sample, the device still has obvious technical defects. On the one hand, there is no effective core cutting mechanism to accurately separate the obtained core segment at the bottom of the hole. On the other hand, the separation mechanism between the coring inner tube and the outer drill rod is not reasonably designed, which makes it difficult to decouple or the operation is unreliable, significantly increasing the risk of coring 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 break long core samples or fail to pull out due to the lack of effective core cutting and coring tube quick decoupling mechanisms during coring, affecting the integrity of the core sample and the reliability of 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 torsional 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 torsional spring is arranged on the first mounting rod, the first mounting rod is connected with the butt joint sleeve through the first mounting rod, 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 torsional 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. By directly taking out, the core sample is easily damaged. Therefore, in the process of core sampling, when the core is filled in the coring tube, the automatic disengagement is completed, 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 mounting rod 103, 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] During operation, as the mating sleeve 9 and the connector 83 align, the bottom of the mounting plate 113 contacts the inclined surface of the connector 83 as the mating sleeve 9 moves downward. Then, under the action of the inclined surface of the connector 83, the mounting plate 113 rotates into the first receiving groove 111. The cutting blade 114 does the same. As the mating sleeve 9 continues to descend, the mounting plate 113 and the cutting blade 114 are eventually squeezed and accommodated into the first receiving groove 111. During this process, because the bottom of the mounting plate 113 is rounded, it is easy for the mounting plate 113 to rotate and be accommodated into the first receiving groove 111. As the drill bit 4 drives the connector 83 to rotate, because the cutting blade 114 is made of a special material and the surface of the connector 83 is smooth, the contact between the cutting blade 114 and the connector 83 does not cause direct wear.

[0052] Then, during the drilling process:

[0053] First state: i.e. Figure 6 As shown, at this time, the core sample is continuously drilled in by the drill bit 4, and the core sample begins to pass through the sliding cavity of the installation tube 81, the snap ring 82, and the butt joint 83 along the center of the drill bit 4 and gradually enters the sliding cavity of the core tube 13.

[0054] Second state: As drill bit 4 continues to drill, the core gradually fills the coring tube 13. When the core fills the coring tube 13, it is the second state.

[0055] Third state: Drill bit 4 continues to drill, and the core continues to enter the core tube 13. Since the core tube 13 is slidably connected to the inner tube 5, the core tube 13 will be gradually lifted by the core sample that has entered the core tube 13 until the core tube 13 contacts the top of the inner wall of the inner tube 5.

[0056] During this process, the core tube 13 will be lifted up. As the core tube 13 is lifted up, it will drive the control ring 109 to slide up along the first slide groove 1010. Then, the control ring 109 will drive several first racks 102 to move upward. The upward movement of the first racks 102 will drive several clamping rods 106 to unfold through the first gear 105, thereby releasing the clamping rods 106 and the limiting plate 107 from limiting the snap ring 82 until the core tube 13 is in contact with the inner wall of the top of the inner tube 5. At this time, the control ring 109 is in contact with the top of the first slide groove 1010. At this time, the limiting plate 107 is also completely disengaged from the snap ring 82, and the edge of the clamping rod 106 will not contact the connector 83 on the vertical line. Therefore, it will not affect the next step of the overall upward movement of the inner tube 5.

[0057] Fourth state: Since the core tube 13 and the inner wall of the inner tube 5 are already attached, as the core sample continues to enter the core tube 13, the entire inner tube 5 will be lifted up. Therefore, the limiting plate 107 no longer limits the locking ring 82, so the inner tube 5 can be lifted up as a whole. During the process of the inner tube 5 being lifted up, the conical groove of the docking sleeve 9 will gradually disengage from the docking joint 83. At this time, the mounting plate 113 and the cutting blade 114 will be gradually released from the first receiving groove 111 under the action of the torsion spring and finally be in a vertical state.

[0058] As the cutting blade 114 gradually becomes vertical, it comes into contact with the core sample. The core sample rotates under the influence of the drill bit 4, allowing the cutting blade 114 to make a notch cut. Since the cutting blade 114 has a wave-like structure, each rotational cut causes the core sample to be squeezed up and down at the notch, eventually leading to the fracture of the core sample. Even if an accident does not cause fracture, the core sample will have a clear notch fracture zone after being damaged by the wave-like cutting blade 114. Therefore, this area is extremely fragile during the extraction process, and the core sample can be easily removed.

[0059] It should be noted that the upward movement involves a very small distance, so the damage caused by the cutting of the core sample by the severing blade 114 during this stage can be ignored.

[0060] Furthermore, see Figures 6-8 As shown, in order to increase the stability of the inner tube 5 during the hooking process and prevent the inner tube 5 from wobbling and colliding with the cavity wall, causing sample damage, the present invention adopts a method in which the inner tube 5 is kept in sliding contact with the cavity wall by the centering component 12 during the hooking process, so as to keep the inner tube 5 in a stable state when hooked out. Specifically, the centering component 12 also includes a second receiving 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. A second gear 123 is rotatably provided at the bottom of the second receiving groove 121. The second gear 123 is fixedly connected to the positioning rod 124, and the second rack 122 and the second gear 123 mesh with each other. A roller 125 is rotatably provided at the top of the positioning rod 124. In the initial state, the positioning rod 124 is located in the second receiving groove 121.

[0061] During operation, when entering the third state, the core tube 13 is lifted. At this time, the core tube 13 will drive the positioning rod 124 to flip outward through the second rack 122 fixed on its outer wall. Then, when the core tube 13 is in contact with the inner wall of the top of the inner tube 5, the positioning rod 124 is in a fully extended state. That is to say, at this time, the positioning rod 124 is in contact with the hole wall through the roller 125. In this way, during the subsequent process of hooking out the entire inner tube 5, the inner tube 5 will be supported by several positioning rods 124. Then, the roller 125 is rotating, which will reduce friction. During the entire hooking process, several positioning rods 124 will ensure the stability of the inner tube 5 during the hooking process and ensure that the core sample will not swing significantly.

[0062] When the core is removed and put back, the core tube 13 will return to the bottom of the inner tube 5 under the action of gravity, which will also drive the positioning rod 124 back into the second receiving groove 121.

[0063] It should be noted that the debris entering between the inner tube 5 and the rotating tube 3, as well as the debris between the rotating tube 3 and the tunnel wall, will be cooled and removed by a special cooling and slag removal device. These devices are existing technologies and are practically used in drilling processes. They are not improvements of this invention, so they will not be described in detail. Secondly, a monitoring device is usually designed near the drill bit. When the core sample breaks and is removed, the drill bit 4 will stop operating.

[0064] In summary, by designing the coring tube as an axially sliding trigger element, the thrust generated after the core is filled in is cleverly used as a power source to achieve a series of operations such as unloading, cutting, and centering support, forming a complete automated coring closed loop. Specifically, the elastic locking structure between the inner tube 5 and the drill bit 4 achieves stable connection in the coring state and automatic unlocking and disengagement after full load. By setting an elastically retractable wave-blade cutting component at the docking point, the bottom of the core is rotated and cut during the disengagement process, effectively avoiding the risk of the entire long core breaking and ensuring sample integrity. At the same time, the centering support mechanism linked by gears and racks automatically unfolds and fits against the borehole wall before lifting, significantly improving the stability of the inner tube lifting process and reducing core disturbance. Thus, it effectively solves the problem that existing core sampling devices, due to the lack of an effective core cutting and quick unloading mechanism for the coring tube 13, are prone to long core breakage or extraction failure, affecting core integrity and sampling reliability.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

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) is provided with a limit component (8) at the top, the rotating tube (3) is provided with an inner tube (5), the bottom of the inner tube (5) is provided with a docking sleeve (9) rotating, the docking sleeve (9) is provided with several sets of cut-off components (11) in a circumferential manner, the docking sleeve (9) is provided with several sets of snap-fit ​​components (10) in a circumferential manner on the outside of the docking sleeve (9), and the inner tube (5) is provided with several sets of centering components (12) in a circumferential manner on the outside of the inner tube (5). The inner tube (5) is slidably provided with a core tube (13), and the limiting component (8) includes an installation tube (81) provided on the top of the drill bit (4), and a tapered joint (83) is provided on the top of the installation tube (81). The snap-fit ​​assembly (10) includes a clamping rod (106), which is rotatably mounted on the docking sleeve (9) by a torsion spring. The clamping rod (106) unfolds as the core tube (13) rises. The cutting assembly (11) includes a mounting plate (113), which has a cutting blade (114) fixed on one side facing the center of the mating sleeve (9). The mounting plate (113) is rotatably mounted on the inner wall of the mating sleeve (9) by a torsion spring. The centering component (12) includes a positioning rod (124), which is rotatably disposed inside the outer wall of the inner tube (5). The positioning rod (124) unfolds as the core tube (13) rises.

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

3. The core sampling device for mineral geological exploration according to claim 1, characterized in that: The installation tube (81), snap ring (82), butt joint (83), butt sleeve (9) and core tube (13) are all provided with a sliding cavity with an inner diameter that matches the core sample. The mounting tube (81) is fixed with several locking rings (82), and the locking rings (82) have an inverted conical structure.

4. The core sampling device for mineral geological exploration according to claim 3, characterized in that: The mating sleeve (9) has a conical groove adapted to the structure of the mating joint (83). The snap-fit ​​assembly (10) also includes a protective sleeve (101). The protective sleeve (101) is fixed on the mating sleeve (9). A first rack (102) is slidably arranged inside the protective sleeve (101). A first mounting rod (103) is rotatably arranged inside the bottom of the mating sleeve (9). A first gear (105) is fixed on the first mounting rod (103). The first gear (105) meshes with the first rack (102). A first torsion spring (104) is arranged on the first mounting rod (103). The first mounting rod (103) is connected to the mating sleeve (9) through the first mounting rod (103). The clamping rod (106) is fixed on the first mounting rod (103).

5. The core sampling device for mineral geological exploration according to claim 4, characterized in that: The clamping rod (106) is fixed with several limiting plates (107) that correspond one-to-one with the snap ring (82), and several balls (108) are rotatably arranged on the top of the limiting plate (107).

6. The core sampling device for mineral geological exploration according to claim 5, characterized in that: The first torsion spring (104) always tends to pull the clamping rods (106) inward and cause the limiting plate (107) to fit against the corresponding snap ring (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 outer periphery of the snap ring (82) is a smooth structure.

7. The core sampling device for mineral geological exploration according to claim 6, characterized in that: The bottom of the inner tube (5) is provided with a first groove (1010) corresponding to the first rack (102). A control ring (109) is slidably arranged around the inner tube (5). The control ring (109) is fixedly connected to the core tube (13). The control ring (109) is slidably connected in the first groove (1010) through a connecting rod. The top and bottom of the first rack (102) are 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 groove (1010), the top of the core tube (13) is in contact with the top inner wall of the inner tube (5).

8. The core sampling device for mineral geological exploration according to claim 7, characterized in that: The cutting assembly (11) further includes a first receiving groove (111) opened on the inner wall of the tapered groove of the mating sleeve (9). A second mounting rod (112) is rotatably arranged in the first receiving groove (111). A torsion spring is provided on the second mounting rod (112). The second mounting rod (112) is connected to the inner wall of the first receiving groove (111) through the torsion spring. The mounting plate (113) is fixed on the second mounting rod (112). The torsion spring tends to keep the mounting plate (113) in a vertical state.

9. The core sampling device for mineral geological exploration according to claim 8, characterized in that: The cutting blade (114) has a sharp front edge and a wavy structure.

10. The core sampling device for mineral geological exploration according to claim 9, characterized in that: The centering component (12) further includes a second receiving 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). A second gear (123) is rotatably provided at the bottom of the second receiving groove (121). The second gear (123) and the positioning rod (124) are fixedly connected, and the second rack (122) and the second gear (123) mesh with each other. A roller (125) is rotatably provided at the top of the positioning rod (124). In the initial state, the positioning rod (124) is located in the second receiving groove (121).

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