A core drilling device for mining exploration and sampling

Abstract

The invention discloses a coring drilling device for mining exploration and sampling, comprising an outer drill barrel, a coring drill barrel, a sampling barrel and a driving mechanism. The outer drill barrel is used for drilling geology. The sampling barrel is arranged on the inner side of the outer drill barrel and is axially slidably connected to the outer drill barrel to transmit the rotational power on the outer drill barrel to the sampling barrel, so that the sampling barrel can rotate with the outer drill barrel, and the sampling barrel and the outer drill barrel can be split along the axial direction. The coring drill barrel is used for coring the core produced by the outer drill barrel drilling. It is arranged in the middle of the sampling barrel, and a sampling gap is formed between the sampling barrel and the coring drill barrel. A sampling piece is provided in the sampling gap. The driving mechanism is respectively connected to the outer drill barrel and the coring drill barrel, and the outer drill barrel is driven to rotate relative to the coring drill barrel by the driving mechanism, so that the core debris produced by drilling can be output upward along the axial direction of the sampling barrel through the sampling piece during the drilling process.

Description

Technical Field

[0001] The invention belongs to the technical field of drill rod coring, and in particular relates to a coring drilling device for mining exploration and sampling. Background Art

[0002] Cores are important physical geological data for studying and understanding underground geology and mineral conditions. When conducting geological prospecting and surveying, core sampling can be performed through a core sampling device. When sampling, a ring-shaped core drill bit can be used to drill holes, and then a sampling tool can be lowered into the well to take out core samples, so as to facilitate the judgment of geological and mineral conditions based on the core samples. The utility model with application number 202323401531.5 discloses a core sampling device for geological prospecting, which uses a coring barrel drill to drill and sample the geology. However, this ring-shaped coring barrel drill has the following shortcomings when used: (1) When coring, the core is taken out together with the coring barrel drill by forming a negative pressure in the coring barrel drill. When the core is loose, the core is easy to fall out of the coring barrel drill; (2) The core needs to be taken out after drilling to know the geological information of the area. It is impossible to obtain the geological information of the core during the drilling process, which is not conducive to the driller's quick judgment on whether to conduct further drilling. Summary of the invention

[0003] In view of the above shortcomings, the technical problem to be solved by the present invention is to provide a coring drilling device for mine exploration and sampling, which can obtain geological information of the core during the drilling process, making it convenient for drillers to quickly carry out the next step of operation, and at the same time can better fix the core in the drill rod to prevent the core from falling.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A coring drilling device for mining exploration and sampling comprises: an outer drill barrel for drilling geological conditions; a coring drill barrel for coring the core produced by the outer drill barrel drilling; a sampling barrel, which forms a sampling gap with the coring drill barrel, and a sampling member is provided in the sampling gap for outputting the core debris produced by drilling axially upward along the sampling barrel, and the sampling barrel is axially slidably connected to the outer drill barrel to transmit the rotational power of the outer drill barrel to the sampling barrel; a coring locking mechanism, which is slidably mounted on the end of the coring drill barrel, slides on the coring drill barrel through the coring locking mechanism, and adjusts the width of the coring locking mechanism to lock the core and core debris in the coring drill barrel and the sampling gap respectively; a driving mechanism, which is respectively connected to the outer drill barrel and the coring drill barrel, and drives the outer drill barrel to rotate relative to the coring drill barrel through the driving mechanism.

[0006] As a preferred solution of the present invention, the coring locking mechanism includes a first locking block, a second locking block and a spreading guide, the first locking block and the second locking block are slidably mounted on the coring drill barrel, and the spacing between the first locking block and the second locking block is changed by moving the first locking block and the second locking block relative to the coring drill barrel, so as to lock the core and core debris in the coring drill barrel and the sampling gap, respectively, and the spreading guide is respectively connected to the first locking block and the second locking block, and is used to drive the first locking block and the second locking block to move simultaneously.

[0007] As a preferred solution of the present invention, the expansion guide member includes a guide rod, which is slidably mounted on the coring drill barrel, and a first locking block and a second locking block are respectively slidably mounted on the two ends of the guide rod, and a first spring and a second spring are respectively provided between the guide rod and the first locking block and the second locking block, for applying an elastic force toward the middle of the guide rod to the first locking block and the second locking block.

[0008] As a preferred solution of the present invention, the expansion guide also includes an impact drill rod, which is fixedly connected to the guide rod, and the end of the impact drill rod extends outward from the end surface of the coring drill barrel for drilling rock and soil.

[0009] As a preferred solution of the present invention, an impact spring is installed on the guide rod, and the impact spring abuts against the coring drill barrel. The impact spring applies a force to the guide rod to spread the first locking block and the second locking block apart and provides a reciprocating force for drilling on the impact drill rod.

[0010] As a preferred solution of the present invention, a cut-off mechanism is provided in the coring drill tube, and a plurality of driving rings are provided on the impact drill rod. The impact drill rod moves relative to the cut-off mechanism, so that the plurality of driving rings drive the cut-off mechanism to reciprocate.

[0011] As a preferred solution of the present invention, the truncation mechanism includes a truncation shaft for truncation of the core and a truncation spring for driving the truncation shaft to reset. The truncation shaft is adapted to a driving ring, and the driving ring drives the truncation shaft to slide.

[0012] As a preferred solution of the present invention, the side walls of the coring drill barrel are respectively provided with a first guide groove and a second guide groove for installing the first locking block and the second locking block, and the distance between the first locking block and the second locking block is changed by the first locking block and the second locking block sliding in the first guide groove and the second guide groove respectively.

[0013] As a preferred solution of the present invention, the sample outlet member is fixed on the inner wall of the sample outlet tube, a sample outlet groove is provided on the sample outlet tube, and a baffle is detachably installed in the sample outlet groove.

[0014] As a preferred solution of the present invention, a slot and a limiting rib are provided on the inner side of the outer drill tube, the bottom of the sample tube is inserted into the slot, and the limiting rib is connected to the sample tube to transmit the rotational power of the outer drill tube to the sample tube.

[0015] Compared with the prior art, the present invention has the following advantages: (1) a sampling tube and a coring drill tube are arranged on the inner side of the outer drill tube, so that geological samples in the sampling gap and in the coring drill tube can be obtained during coring, thereby increasing the number of samples for subsequent experiments.

[0016] (2) During the drilling process, the core debris generated by drilling is discharged through the sampling gap, which is convenient for the staff to initially obtain the drilling progress and geological information during the drilling process, thereby facilitating the staff to arrange subsequent drilling operations and improve drilling efficiency.

[0017] (3) The core and core debris produced by drilling are locked in the sampling gap and the coring drill barrel through the coring locking mechanism to prevent the core and core debris from falling out of the sampling gap and the coring drill barrel due to their looseness.

[0018] (4) The core produced by the outer drill barrel is further drilled by the impact drill rod and the impact spring to form sampled core fragments and sampled cores. At the same time, when obtaining the sampled cores, the impact spring can be used to drive the core locking mechanism to expand, thereby locking the core in the sampling gap and the coring drill barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of the device.

[0020] Figure 2 This is a partial enlarged view of point A.

[0021] Figure 3 This is a partial enlarged view of point B.

[0022] Figure 4 It is a structural schematic diagram of the sample tube.

[0023] Figure 5 It is a schematic diagram of the structure of the outer drill tube.

[0024] Figure numerals: outer drill tube 1, card slot 1-1, limiting rib 1-2, coring drill tube 2, first guide groove 2-1, second guide groove 2-2, drill head 2-3, tapered part 2-4, storage part 2-5, through groove 2-6, impact slide groove 2-7, sample tube 3, sample piece 3-1, sample groove 3-2, baffle 3-3, card slot 3-4, sample gap 4, coring locking mechanism 5, first locking block 5-1, second locking block 5- 2, guide rod 5-3, first spring 5-4, second spring 5-5, impact drill rod 5-6, impact spring 5-7, drive ring 5-8, limit ring 5-9, slider 5-10, drive mechanism 6, main gear 6-1, transmission gear 6-2, ring gear 6-3, transmission box 6-4, first connecting sleeve 6-5, discharge groove 6-6, second connecting sleeve 6-7, cut-off mechanism 7, cut-off shaft 7-1, cut-off spring 7-2. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] like Figure 1 As shown, a coring drilling device for mining exploration and sampling comprises an outer drill tube 1, a coring drill tube 2, a sample tube 3 and a driving mechanism 6. The outer drill tube 1 is used for drilling geology. The sample tube 3 is arranged on the inner side of the outer drill tube 1 and is axially slidably connected with the outer drill tube 1 to transmit the rotational power of the outer drill tube 1 to the sample tube 3, so that the sample tube 3 can rotate with the outer drill tube 1, and the sample tube 3 and the outer drill tube 1 can be split along the axial direction. The coring drill tube 2 is arranged on the inner side of the outer drill tube 1 and is axially slidably connected with the outer drill tube 1 to transmit the rotational power of the outer drill tube 1 to the sample tube 3, so that the sample tube 3 can rotate with the outer drill tube 1, and the sample tube 3 and the outer drill tube 1 can be split along the axial direction. The utility model is used for coring the core produced by the outer drill barrel 1, and is arranged in the middle part of the sample output tube 3, and a sample output gap 4 is formed between the sample output tube 3 and the coring drill barrel 2, and a sample output piece 3-1 is arranged in the sample output gap 4, and a driving mechanism 6 is respectively connected with the outer drill barrel 1 and the coring drill barrel 2, and the outer drill barrel 1 is driven to rotate relative to the coring drill barrel 2 by the driving mechanism 6, so that the core fragments produced by drilling can be output to the top of the sample output tube 3 through the sample output piece 3-1 during the drilling process.

[0027] During the drilling process, the core drilling device transports the core fragments in the sampling gap 4 to the top of the sampling tube 3 through the sampling piece 3-1, so that the drillers can observe the geological composition during the drilling process, thereby facilitating the drillers to judge whether to drill further. The core is stored in the coring drill tube 2, so that the drillers can analyze the geological layer structure after coring.

[0028] During the coring process, the coring drill barrel 2 needs to be removed from the outer drill barrel 1. To prevent the core debris in the sampling gap 4 from affecting the removal of the coring drill barrel 2, the sampling barrel 3 and the coring drill barrel 2 are removed simultaneously. To ensure that the sampling barrel 3 and the coring drill barrel 2 are removed simultaneously, a coring locking mechanism 5 is slidably installed at the bottom of the coring drill barrel 2. The coring locking mechanism 5 slides on the coring drill barrel 2 to adjust the width of the coring locking mechanism 5, thereby locking the core and the core debris in the coring drill barrel 2 and the sampling gap 4. The sampling barrel 3 and the coring drill barrel 2 are clamped by the core debris in the sampling gap 4, thereby realizing the simultaneous removal of the sampling barrel 3 and the coring drill barrel 2.

[0029] like Figure 2 As shown, the coring locking mechanism 5 includes a first locking block 5-1, a second locking block 5-2 and a support guide. The first locking block 5-1 and the second locking block 5-2 are slidably installed on the coring drill barrel 2. The first locking block 5-1 and the second locking block 5-2 are moved relative to the coring drill barrel 2 to change the distance between the first locking block 5-1 and the second locking block 5-2, so as to lock the core in the coring drill barrel 2 and the sampling gap 4; the support guide is respectively connected to the first locking block 5-1 and the second locking block 5-2, and is used to drive the first locking block 5-1 and the second locking block 5-2 to move simultaneously, so as to ensure that the core in the coring drill barrel 2 and the sampling gap 4 is supported at the same time, and the core is prevented from falling from the coring drill barrel 2 and the sampling gap 4. In some preferred embodiments, multiple first locking blocks 5-1 are evenly distributed on the outer wall of the coring drill barrel 2, and multiple second locking blocks 5-2 are evenly distributed on the inner wall of the coring drill barrel 2, thereby supporting the cores on both the inner and outer sides of the coring drill barrel 2.

[0030] The support guide member includes a guide rod 5-3, a first spring 5-4 and a second spring 5-5. The guide rod 5-3 is slidably installed on the coring drill barrel 2. The first locking block 5-1 and the second locking block 5-2 are respectively slidably installed at the two ends of the guide rod 5-3. Limiting rings 5-9 are respectively provided at the two ends of the guide rod 5-3. The first spring 5-4 is arranged between the limiting ring 5-9 and the first locking block 5-1. The second spring 5-5 is arranged between the limiting ring 5-9 and the second locking block 5-2, which is used to apply an elastic force toward the middle of the guide rod 5-3 to the first locking block 5-1 and the second locking block 5-2. Under normal circumstances, the first locking block 5-1 and the second locking block 5-2 are in a contracted state to prevent the first locking block 5-1 and the second locking block 5-2 from affecting the core drilling.

[0031] like Figure 2As shown, the coring drill barrel 2 includes a drill head 2-3, a tapered portion 2-4 and a storage portion 2-5. The drill head 2-3 is connected to the storage portion 2-5 through the tapered portion 2-4. The drill head 2-3 is used to further drill the core formed by drilling the outer drill barrel 1 so as to store the core in the storage portion 2-5. The first guide groove 2-1 for installing the first locking block 5-1 is evenly arranged on the outer wall of the tapered portion 2-4, and the second guide groove 2-2 for installing the second locking block 5-2 is evenly arranged on the inner wall of the tapered portion 2-4. The groove depth of the first guide groove 2-1 and the groove depth of the second guide groove 2-2 are gradually shallower from the storage portion 2-5 side toward the drill head 2-3 side. When the first guide groove 2-1 and the second guide groove 2-2 move toward the drill head 2-3, the distance between the first locking block 5-1 and the second locking block 5-2 increases, thereby supporting the coring drill barrel 2 and the core in the sample gap 4.

[0032] In order to facilitate the sliding of the guide rod 5-3 on the coring drill barrel 2, a through groove 2-6 is provided between the first guide groove 2-1 and the second guide groove 2-2, and a slider 5-10 is provided in the middle of the guide rod 5-3. The guide rod 5-3 is slidably installed in the through groove 2-6 through the slider 5-10 to prevent the guide rod 5-3 from slipping along the axial direction of the coring drill barrel 2. Preferably, the length of the guide rod 5-3 is consistent with the thickness of the coring drill barrel 2, and the two ends of the guide rod 5-3 are located on the same circumference as the inner and outer side walls of the coring drill barrel 2 to prevent the guide rod 5-3 from rubbing against the core.

[0033] The support guide also includes an impact drill rod 5-6, which is fixed on the slider 5-10 and arranged along the tapered portion 2-4. An impact slide groove 2-7 is arranged in the through groove 2-6. The impact drill rod 5-6 is slidably installed in the impact slide groove 2-7, thereby providing guidance for the sliding of the slider 5-10. The end of the impact drill rod 5-6 extends out of the end surface of the coring drill barrel 2, which is used for impact drilling of the core. An impact spring 5-7 is sleeved on the outer side of the impact drill rod 5-6, and the impact spring 5-7 is respectively in contact with the slider 5-10 and the impact slide groove 2-7, and applies a force toward the drill head 2-3 to the impact drill rod 5-6 (guide rod 5-3), which is used to support the first locking block 5-1 and the second locking block 5-2 or drive the impact drill rod 5-6 to reciprocate, thereby facilitating the impact drill rod 5-6 to impact drill the core.

[0034] A cut-off mechanism 7 is provided in the drill head 2-3, and a plurality of driving rings 5-8 are provided on the impact drill rod 5-6. When the impact drill rod 5-6 is extended, the driving ring 5-8 on the impact drill rod 5-6 abuts against the cut-off mechanism 7, thereby driving the cut-off mechanism 7 to move through the driving ring 5-8, so as to facilitate the cut-off of the core. In some preferred embodiments, during the drilling process, since the impact spring 5-7 is in a certain compression state, the driving ring 5-8 is separated from the cut-off mechanism 7, and the optical axis of the impact drill rod 5-6 abuts against the cut-off mechanism 7, so that the cut-off mechanism 7 does not move relative to each other, thereby preventing the core from breaking during the drilling process; when coring, the impact spring 5-7 drives the impact drill rod 5-6 to be fully extended, and at this time the driving ring 5-8 abuts against the cut-off mechanism 7, driving the cut-off mechanism 7 to move and cut the core.

[0035] The cut-off mechanism 7 includes a cut-off shaft 7-1 for cutting the core and a cut-off spring 7-2 for driving the cut-off shaft 7-1 to reset. The cut-off shaft 7-1 is adapted to the drive ring 5-8, that is, when the cut-off mechanism 7 is working, the drive ring 5-8 abuts against the cut-off shaft 7-1, and the cut-off shaft 7-1 is driven to slide by the drive ring 5-8.

[0036] The working principle of the coring locking mechanism 5 is as follows:

[0037] (1) During the drilling process, the impact drill rod 5-6 abuts against the core. At this time, the impact spring 5-7 is in a fully compressed state. Due to the uneven surface of the core, the impact drill rod 5-6 reciprocates under the action of the impact spring 5-7, thereby performing preliminary drilling on the core through the impact drill rod 5-6. At the same time, since the impact drill rod 5-6 is in a contracted state, the first locking block 5-1 is completely received in the first guide groove 2-1, and the second locking block 5-2 partially extends out of the second guide groove 2-2. The second locking block 5-2 further crushes the core debris, so that the core debris can enter the sample gap 4;

[0038] (2) The core is further drilled by the drill head 2-3 of the coring drill barrel 2 so as to store the core in the storage part 2-5. During the drilling process, the core debris in the sample gap 4 is moved to the top of the sample barrel 3 through the sample discharge piece 3-1 until it is discharged out of the sample barrel 3;

[0039] (3) When coring, the coring drill barrel 2 is lifted (the sampling barrel 3 and the coring drill barrel 2 can also be lifted at the same time), and the impact drill rod 5-6 is pushed out under the action of the impact spring 5-7, driving the first locking block 5-1 and the second locking block 5-2 to slide downward and spread apart, thereby locking the core and core debris in the coring drill barrel 2 and the sampling gap 4 respectively; at the same time, during the process of the impact drill rod 5-6 being pushed out, the truncation shaft 7-1 is driven to move axially to facilitate the truncation of the core.

[0040] like Figure 4 As shown, the sample output part 3-1 is a spiral plate fixed on the inner wall of the sample output tube 3, and a sample output groove 3-2 is provided on the sample output tube 3. The sample output tube 3 and the coring drill tube 2 rotate relative to each other to move the core debris in the sample output gap 4 toward the top of the sample output tube 3, until the core debris is discharged to the outside of the sample output tube 3 through the sample output groove 3-2. A baffle 3-3 is detachably installed in the sample output groove 3-2, and the sample output groove 3-2 is blocked by the baffle 3-3. Preferably, only the sample output groove 3-2 at the top of the entire coring drilling device is opened during the drilling process. As a preferred embodiment, the gap between the side wall of the sample output part 3-1 and the outer wall of the coring drill tube 2 is less than or equal to 1 cm to prevent the core from falling during the transportation process.

[0041] like Figure 3 , Figure 5 As shown, a slot 1-1 and a limiting rib 1-2 are provided on the inner side of the outer drill tube 1, the bottom of the sample tube 3 is inserted into the slot 1-1, a slot 3-4 is provided on the outer side wall of the sample tube 3, and the limiting rib 1-2 is inserted into the slot 3-4, thereby transmitting the rotational power of the outer drill tube 1 to the sample tube 3.

[0042] like Figure 1 As shown, the driving mechanism 6 includes a main gear 6-1, a transmission gear 6-2, a gear ring 6-3 and a transmission box 6-4. The transmission gear 6-2 and the gear ring 6-3 are rotatably mounted in the transmission box 6-4 through a rotating shaft. The gear ring 6-3 is rotatably mounted in the transmission box 6-4. A first connecting sleeve 6-5 is connected to the bottom of the gear ring 6-3. The outer drill tube 1 is connected to the first connecting sleeve 6-5, so that the outer drill tube 1 rotates with the gear ring 6-3. At the same time, the sample tube 3 rotates with the outer drill tube 1. At the same time, a discharge groove 6-6 is provided on the side wall of the first connecting sleeve 6-5, so that the core debris can be discharged outside the device through the sample groove 3-2 and the discharge groove 6-6; a second connecting sleeve 6-7 is connected to the bottom of the main gear 6-1, and the second connecting sleeve 6-7 is connected to the coring drill barrel 2 to drive the coring drill barrel 2 to rotate. There is a speed difference between the main gear 6-1 and the ring gear 6-3, which prevents the outer drill barrel 1 and the coring drill barrel 2 from rotating at the same time to affect the coring effect of the core.

[0043] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0044] Although this article uses more terms corresponding to the figure marks in the figures, it does not exclude the possibility of using other terms; these terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A core drilling device for mining exploration and sampling, characterized in that: include: An outer drill tube (1) for drilling geological surveys; A coring drill barrel (2) is used to perform coring drilling on the rock core produced by drilling with the outer drill barrel (1); A sample outlet tube (3) is formed with the coring drill tube (2) to form a sample outlet gap (4). A sample outlet member (3-1) is provided in the sample outlet gap (4) for outputting the core debris generated by drilling upward along the axial direction of the sample outlet tube (3). The sample outlet tube (3) is axially slidably connected to the outer drill tube (1) to transmit the rotational power of the outer drill tube (1) to the sample outlet tube (3); A coring locking mechanism (5) is slidably mounted on the end of the coring drill barrel (2), and the core and core debris are respectively locked in the coring drill barrel (2) and the sample gap (4) by sliding the coring locking mechanism (5) on the coring drill barrel (2) to adjust the width of the coring locking mechanism (5); The driving mechanism (6) is respectively connected to the outer drill tube (1) and the coring drill tube (2), and the outer drill tube (1) is driven to rotate relative to the coring drill tube (2) through the driving mechanism (6).

2. A core drilling device for mining exploration and sampling according to claim 1, characterized in that: The coring locking mechanism (5) comprises a first locking block (5-1), a second locking block (5-2) and a spreading guide piece. The first locking block (5-1) and the second locking block (5-2) are slidably mounted on the coring drill barrel (2). The first locking block (5-1) and the second locking block (5-2) are moved relative to the coring drill barrel (2) to change the spacing between the first locking block (5-1) and the second locking block (5-2), so as to lock the core and core debris in the coring drill barrel (2) and the sample outlet gap (4), respectively. The spreading guide piece is connected to the first locking block (5-1) and the second locking block (5-2), respectively, and is used to drive the first locking block (5-1) and the second locking block (5-2) to move simultaneously.

3. A core drilling device for mining exploration and sampling according to claim 2, characterized in that: The expansion guide member comprises a guide rod (5-3), the guide rod (5-3) is slidably mounted on the coring drill tube (2), a first locking block (5-1) and a second locking block (5-2) are respectively slidably mounted on the two ends of the guide rod (5-3), and a first spring (5-4) and a second spring (5-5) are respectively provided between the guide rod (5-3) and the first locking block (5-1) and the second locking block (5-2), for applying an elastic force to the first locking block (5-1) and the second locking block (5-2) towards the middle of the guide rod (5-3).

4. A core drilling device for mining exploration and sampling according to claim 3, characterized in that: The expansion guide member also includes an impact drill rod (5-6), which is fixedly connected to the guide rod (5-3), and the end of the impact drill rod (5-6) extends out of the end surface of the coring drill tube (2) for drilling rock and soil.

5. A core drilling device for mining exploration and sampling according to claim 4, characterized in that: An impact spring (5-7) is installed on the guide rod (5-3), the impact spring (5-7) abuts against the coring drill tube (2), and the impact spring (5-7) applies a force to the guide rod (5-3) to spread apart the first locking block (5-1) and the second locking block (5-2) and to provide a reciprocating force for drilling on the impact drill rod (5-6).

6. A core drilling device for mining exploration and sampling according to claim 4, characterized in that: A cut-off mechanism (7) is provided in the coring drill tube (2), and a plurality of drive rings (5-8) are provided on the impact drill rod (5-6). The impact drill rod (5-6) moves relative to the cut-off mechanism (7), so that the plurality of drive rings (5-8) drive the cut-off mechanism (7) to reciprocate.

7. A core drilling device for mining exploration and sampling according to claim 6, characterized in that: The truncation mechanism (7) comprises a truncation shaft (7-1) for truncation of the core and a truncation spring (7-2) for driving the truncation shaft (7-1) to reset; the truncation shaft (7-1) is adapted to a drive ring (5-8) and the truncation shaft (7-1) is driven to slide via the drive ring (5-8).

8. A core drilling device for mining exploration and sampling according to claim 2, characterized in that: A first guide groove (2-1) and a second guide groove (2-2) for mounting a first locking block (5-1) and a second locking block (5-2) are respectively provided on the side walls of the coring drill tube (2); the spacing between the first locking block (5-1) and the second locking block (5-2) is changed by the first locking block (5-1) and the second locking block (5-2) sliding in the first guide groove (2-1) and the second guide groove (2-2) respectively.

9. A core drilling device for mining exploration and sampling according to claim 1, characterized in that: The sample outlet member (3-1) is fixed on the inner wall of the sample outlet tube (3); a sample outlet groove (3-2) is provided on the sample outlet tube (3); and a baffle (3-3) is detachably installed in the sample outlet groove (3-2).

10. A core drilling device for mining exploration and sampling according to claim 1, characterized in that: A clamping groove (1-1) and a limiting rib (1-2) are provided on the inner side of the outer drill tube (1); the bottom of the sample outlet tube (3) is inserted into the clamping groove (1-1); and the limiting rib (1-2) is connected to the sample outlet tube (3) so as to transmit the rotational power of the outer drill tube (1) to the sample outlet tube (3).

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