Coal mining separation space drilling device and method

Abstract

The invention provides a coal mining separation space drilling device and method, and relates to the technical field of coal rock drilling. The drill rod comprises a drill rod body, a plurality of sleeve shells which are arranged together in a sleeved mode are arranged in the drill rod body, the inner diameters of all the sleeve shells are sequentially reduced from outside to inside, trapezoidal blocks distributed in the circumferential direction and check blocks distributed in the circumferential direction are arranged between every two adjacent sleeve shells, and the check blocks are used for extruding the adjacent trapezoidal blocks. A plurality of elastic pieces are fixedly connected between every two adjacent sleeve shells. Drilling rock cores are collected section by section through the multiple layers of sleeve shells, in the process of collecting the rock cores section by section, the openings of all the sleeve shells deform in sequence, the rock cores are clamped, so that it is guaranteed that the form of the rock cores is stable, the probability that the rock cores change due to the fact that gaps exist in the separation space is reduced, and the rock core separation efficiency is improved. Therefore, the accuracy of a sampling result is guaranteed, the accuracy of judgment on separation space distribution is further guaranteed, and subsequent normal mining of a coal mine is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of coal and rock drilling technology, and more specifically to a drilling device and method for drilling into the space of coal mining separation. Background Technology

[0002] In coal mining, the abscission space refers to the cavities and gaps formed between different rock strata due to deformation differences after the overlying strata fracture, bending, and deformation caused by mining activities. During coal mining, drilling is often necessary to determine the distribution of abscission spaces within the coal seam. However, traditional core drilling techniques face significant technical challenges when applied to abscission spaces with loose structures, numerous voids, or weak interlayers: the rock strata within the abscission space are unevenly distributed, and voids exist. During drilling and retraction, traditional core sampling methods cause the core to actively fill these voids, leading to displacement of the rock strata. This is particularly problematic for maintaining the original structure and hierarchical relationships of weak and fractured strata. Consequently, the extracted samples cannot accurately reflect the state of the abscission space, severely impacting the accuracy of determining its distribution. Summary of the Invention

[0003] In order to overcome the shortcomings mentioned in the background art, the present invention provides a drilling device and method for drilling into the delamination space in coal mining.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A coal mining delamination space drilling device includes a drill rod, inside which are arranged a plurality of sleeves nested together. The inner diameter of all the sleeves decreases sequentially from the outside to the inside. Between two adjacent sleeves, there are circumferentially distributed trapezoidal blocks and circumferentially distributed stop blocks. The trapezoidal blocks are fixed to the outer surface of the adjacent sleeves, and the stop blocks are fixed to the inner surface of the adjacent sleeves. The stop blocks are used to compress the adjacent trapezoidal blocks. Between two adjacent sleeves, there are a plurality of circumferentially distributed elastic elements. The outermost sleeve is fixed with circumferentially uniformly distributed pressure plates. Inside the drill rod, there is a compression ring for compressing all the pressure plates.

[0005] More preferably, the elastic coefficients of all the elastic elements increase sequentially from the inner shell to the outer shell.

[0006] More preferably, a connecting ring is slidably connected inside the drill rod, a pneumatic rod is fixedly connected to the connecting ring, a connecting rope is fixedly connected between the telescopic part of the pneumatic rod and the inner sleeve, and a tension spring is fixedly connected between the telescopic part and the fixed part of the pneumatic rod.

[0007] More preferably, the elastic element is fixedly connected to an airbag, the airbag is located between two adjacent shells, the material of the shell located on the outside of the airbag is rigid, the rest of the shell is made of elastic material, and the airbag is internally connected to the pneumatic rod.

[0008] More preferably, the thickness of the airbag gradually decreases from the point away from the compression ring to the point near it.

[0009] More preferably, the spring constant is greater than the spring constant of all the elastic elements.

[0010] More preferably, the drill pipe is provided with a plurality of guide grooves, which are used to guide impurities.

[0011] More preferably, the guide groove is threaded.

[0012] More preferably, the outer surface of the drill rod is provided with protrusions to increase the surface roughness of the drill rod.

[0013] A method for drilling into the space between layers in coal mining, using the aforementioned coal mining space drilling device, comprises the following steps: Step 1: Rotate the drill rod and insert it into the rock strata. As the drill rod rotates and moves, the drilled rock strata first enter the innermost casing, and impurities on the outer wall of the drill rod are discharged into the borehole along the guide groove. Step 2: Move the connecting ring in the opposite direction to the drill pipe's travel. The connecting ring drives the pneumatic rod to move, and the telescopic part of the pneumatic rod drives the inner casing to move through the connecting rope. Step 3: During the movement of the inner shell, the inner shell squeezes the adjacent elastic elements until the inner elastic elements are compressed to their limit. The inner shell then drives the adjacent outer shell to move through the adjacent elastic elements. This step is repeated so that the multiple shells move sequentially from the inside to the outside, and the rock core enters all the shells in sequence. Step 4: During the movement of the casing, all the trapezoidal blocks on it move until the stop block contacts and squeezes the adjacent trapezoidal blocks. Deformation occurs at all the trapezoidal blocks on the casing, causing the casing to deform and clamp the drilled rock core. Step 5: When the drill rod is inserted into the rock layer to its limit, the drill rod drives the compression ring to move. The compression ring squeezes all the pressure plates, causing the outermost shell to deform and clamp the rock core. Step 6: When the sampled rock layer is clamped and all the shells are inserted into the rock layer to the limit, all elastic elements are compressed to the limit. As the connecting ring drives the pneumatic rod to continue moving, the telescopic part of the pneumatic rod extends and the tension spring is stretched. During the extension of the telescopic part of the pneumatic rod, the gas inside the pneumatic rod is forced into all the air bladders through multiple conduits. The air bladders expand and clamp the corresponding shells. Step 7: After all the casings are removed from the drill pipe, the tension springs rebound, causing the telescopic part of the pneumatic rod to contract. The gas in all the airbags is drawn back into the pneumatic rod, and the airbags no longer clamp the corresponding casings. All casings are then struck to remove the rock cores from all the casings. All the elastic elements rebound in sequence, resetting the casings.

[0014] Compared with the prior art, the present invention has the following advantages: This invention uses a multi-layered casing to collect drilled rock cores segment by segment. During the segmented collection process, the openings of all casings deform sequentially, clamping the rock core to ensure its morphological stability and reduce the probability of changes in the rock core due to voids in the delamination space. This ensures the accuracy of the sampling results and, consequently, the accuracy of the judgment of the delamination space distribution, thus guaranteeing the normal operation of the coal mine. The inner casing is moved by the telescopic part of the pneumatic rod, and all casings move sequentially, reducing the compressive force exerted by the casings on the rock core and lowering the probability of core deformation. Furthermore, after drilling of the rock strata is completed, the expansion of the airbag keeps the casing in a compressed state, further ensuring the accuracy of the drilled rock core. Impurities are discharged from the borehole through the guide groove, reducing the probability of drill rod movement being obstructed due to continuous rock detachment in the delamination space. This reduces the resistance encountered by the drill rod during drilling and improves the stability and efficiency of drilling. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional sectional view of the drill pipe of the present invention; Figure 3 This is a three-dimensional structural cross-sectional view of the casing of the present invention; Figure 4 This is a three-dimensional structural diagram of the elastic element of the present invention; Figure 5 This is a three-dimensional structural schematic diagram of the tension spring of the present invention; Figure 6 This is a three-dimensional structural diagram of the airbag of the present invention.

[0016] The components in the attached diagram are labeled as follows: 1. Drill pipe, 2. Sleeve, 201. Trapezoidal block, 202. Stop block, 3. Elastic element, 4. Pressure plate, 5. Compression ring, 6. Connecting ring, 7. Pneumatic rod, 8. Connecting rope, 9. Tension spring, 10. Airbag, 11. Guide groove. Detailed Implementation

[0017] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. Certain embodiments of the invention will be described more fully below with reference to the accompanying drawings, and some, but not all, of these embodiments will be shown. In fact, various embodiments of the invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to enable the invention to meet applicable legal requirements.

[0018] In the description of this invention, it should be noted that the terms "inner," "outer," "upper," "lower," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] Example 1 Traditional core drilling technology faces the following significant technical challenges when applied to delamination spaces with loose structures, numerous voids, or weak interlayers: the rock strata within the delamination space are unevenly distributed and contain voids. During drilling and retraction, the core actively fills these voids, causing displacement of the rock strata. This makes it particularly difficult to maintain the original structure and layered relationships of weak and fractured rock strata. Consequently, the extracted samples cannot accurately reflect the state of the delamination space, severely impacting the accuracy of the assessment of its distribution.

[0020] A coal mining separation space drilling device, such as Figures 1-4As shown, the device includes a drill rod 1, which is mounted on a drive device. The drive device is an existing structure and is not shown in the figure. The drive device is used to drive the drill rod 1 to rotate and move. Several sleeves 2 are nested together inside the drill rod 1. Each sleeve 2 has several circumferentially distributed through slots. The left side of each sleeve 2 is made of an elastic material. When pressure is applied to the outer side of the left side of each sleeve 2, the sleeve 2 deforms, causing the inner diameter of the left side of each sleeve 2 to decrease. The inner diameter of all sleeves 2 decreases sequentially from the outside to the inside. A circumferentially distributed trapezoidal block 201 and a surrounding... The inner shell 2 has distributed stop blocks 202, trapezoidal blocks 201 fixed to the outer surface of the adjacent shell 2, and stop blocks 202 fixed to the inner surface of the adjacent shell 2. When the inner shell 2 moves to the right, the shell 2 drives all the stop blocks 202 on it to move to the right. As the trapezoidal blocks 201 move to contact the adjacent stop blocks 202, the trapezoidal blocks 201 continue to move, and the stop blocks 202 squeeze the adjacent trapezoidal blocks 201. All the trapezoidal blocks 201 on the shell 2 deform, causing the inner diameter on the left side of the shell 2 to decrease. Several circumferentially distributed elastic elements 3 are fixed between two adjacent shells 2. From the inner shell 2 to the outer shell 2, the elastic coefficients of all elastic elements 3 increase sequentially. When the inner shell 2 moves to the right, the shell 2 compresses the adjacent elastic elements 3, causing the inner elastic elements 3 to deform under pressure. This continues until the inner elastic elements 3 are compressed to their limit. Then, the inner shell 2, through the adjacent elastic elements 3, drives the outer adjacent shell 2 to move to the right. This process is repeated, causing the multiple shells 2 to move to the right sequentially from the inside to the outside. The outermost shell 2 is fixedly connected to circumferentially uniformly distributed pressure plates 4. A compression ring 5 for compressing all the pressure plates 4 is fixedly connected inside the drill pipe 1. The drill rod 1 drives the compression ring 5 to move to the right, and the compression ring 5 compresses all the pressure plates 4. All the pressure plates 4 clamp the rock core, so that the rock core can be pulled out. The rock core is collected segment by segment through the multi-layer shell 2. During the segment collection of the rock core, the openings of all the shells 2 deform in sequence to clamp the rock core, so as to ensure the stability of the rock core shape and reduce the probability of changes in the rock core due to the existence of voids in the delamination space. This ensures the accuracy of the rock core and, in turn, the accuracy of the judgment of the delamination space distribution, so as to ensure the normal mining of coal mines.

[0021] like Figures 2-6As shown, a connecting ring 6 is slidably connected inside the drill pipe 1. A pneumatic rod 7 is fixedly connected to the connecting ring 6. A connecting rope 8 is fixedly connected between the telescopic part of the pneumatic rod 7 and the inner casing 2. A tension spring 9 is fixedly connected between the telescopic part and the fixed part of the pneumatic rod 7. When it is necessary to extract the core, the connecting ring 6 drives the pneumatic rod 7 to move to the right. The telescopic part of the pneumatic rod 7 drives the inner casing 2 to move to the right through the connecting rope 8. Since the elastic coefficient of the tension spring 9 is greater than the elastic coefficient of all elastic elements 3, and all elastic elements 3 are compressed to their limit, when all casings 2 move sequentially to the right... After the rightward movement reaches its limit, the telescopic part of the pneumatic rod 7 will extend, and the tension spring 9 will stretch. The elastic element 3 is fixedly connected to the airbag 10. The thickness of the airbag 10 gradually decreases from the point away from the compression ring 5 to the point closer to it, to ensure the pressure and deformation of the right side of the casing 2, thereby ensuring the clamping force of the casing 2 on the rock core. The airbag 10 is located between two adjacent casings 2. The material on the outer side of the casing 2 containing the airbag 10 is rigid, while the rest of the casing 2 is made of elastic material. The airbag 10 is connected to the interior of the pneumatic rod 7 via a conduit. The length of this conduit... The movement of the airbag 10 is sufficient to allow for the movement of the air duct. A protective sleeve can be installed outside the air duct to protect it, ensuring its stability during movement and preventing the movement of the housing 2 from being affected by the air duct. During the extension of the telescopic part of the air pressure rod 7, the gas inside the air pressure rod 7 is forced into all the airbags 10 through multiple tubes. The airbags 10 inflate and clamp the left half of the corresponding housing 2. The right half of the innermost housing 2 is solid. Furthermore, after all the housings 2 have moved sequentially to their rightmost limits, the left half of the innermost housing 2 is located at... The outer shell 2 is located in the right half of the adjacent outer shell 2 to ensure that all airbags 10 clamp the left half of the corresponding outer shell 2. Each section of the rock core is also located in the left half of the corresponding outer shell 2 to ensure that the rock core is clamped by the outer shell 2. During the drilling process, the inner shell 2 is moved by the telescopic part of the air pressure rod 7. All the outer shells 2 move in sequence, which reduces the squeezing pressure of the outer shell 2 on the rock core and reduces the probability of rock core deformation. Furthermore, after the rock strata are drilled, the expansion of the airbags 10 keeps the outer shell 2 in a compressed state, thereby ensuring the accuracy of the rock core.

[0022] The specific working principle is as follows: When the operator needs to use this device to drill coal and rock strata, the operator installs the drill rod 1 onto the drive equipment. The drive equipment drives the drill rod 1 to rotate, and the drill rod 1 rotates and inserts into the rock strata. During the rotation and movement of the drill rod 1, the drilled rock strata first enter the innermost shell 2. At this time, the operator moves the connecting ring 6 to the right. The connecting ring 6 drives the pneumatic rod 7 to move to the right. The telescopic part of the pneumatic rod 7 drives the inner shell 2 to move to the right through the connecting rope 8.

[0023] As the inner shell 2 moves to the right, it compresses the adjacent elastic element 3, causing the inner elastic element 3 to deform under pressure until it is compressed to its limit. Then, the inner shell 2 drives the adjacent outer shell 2 to move to the right through the adjacent elastic element 3. This process is repeated so that the multiple shells 2 move to the right from the inside to the outside in sequence, and the rock core enters all the shells 2 in sequence.

[0024] When the casing 2 moves to the right, it causes all the trapezoidal blocks 201 on it to move to the right. As the trapezoidal blocks 201 move to contact the adjacent stop blocks 202, they continue to move. The stop blocks 202 squeeze the adjacent trapezoidal blocks 201, causing deformation at all the trapezoidal blocks 201 on the casing 2. This reduces the inner diameter on the left side of the casing 2. The core is collected segment by segment through the multiple casings 2. During the segmented collection of the core, the openings of all the casings 2 deform in sequence, clamping the core to ensure the stability of the core's shape and reduce the probability of changes in the core due to gaps in the delamination space. This ensures the accuracy of the core and, in turn, the accuracy of the judgment of the delamination space distribution, thus ensuring the normal mining of the coal mine.

[0025] When the drill rod 1 is inserted into the rock layer to its limit, the squeeze ring 5 moves to the right through the drill rod 1. The squeeze ring 5 squeezes all the pressure plates 4, and all the pressure plates 4 clamp the rock core so that the rock core can be pulled out.

[0026] When the sampled rock layer is clamped, all the casings 2 move to the right to their limit, and all the elastic elements 3 are compressed to their limit. As the connecting ring 6 drives the pneumatic rod 7 to continue moving to the right, the telescopic part of the pneumatic rod 7 extends, and the tension spring 9 is stretched. During the extension of the telescopic part of the pneumatic rod 7, the gas inside the pneumatic rod 7 is forced into all the airbags 10 through multiple conduits. The airbags 10 expand and clamp the corresponding casing 2. By utilizing the expansion of the airbags 10, the casing 2 is kept in a compressed state, thereby ensuring the accuracy of the rock core.

[0027] After all the casings 2 are removed from the drill pipe 1, the tension spring 9 rebounds, causing the telescopic part of the pneumatic rod 7 to contract. The gas in all the airbags 10 is drawn back into the pneumatic rod 7, and the airbags 10 no longer clamp the corresponding casings 2. All the casings 2 are struck, and the rock core inside all the casings 2 is poured out. All the elastic elements 3 rebound in sequence, causing the casings 2 to move to the left. All the casings 2 are then inserted back into the drill pipe 1 for the next use.

[0028] Example 2 Based on Example 1, such as Figure 1 and Figure 2As shown, the drill rod 1 is provided with several guide grooves 11. During the drilling process of the drill rod 1 into the coal rock strata, the guide grooves 11 guide impurities. The guide grooves 11 are threaded and the spiral direction is opposite to the rotation direction of the drill rod 1. During the rotation of the drill rod 1, the impurities (rock fragments that continuously fall off during the drilling process) are discharged from the borehole along the guide grooves 11, reducing the probability of the drill rod 1 being obstructed due to the continuous falling of rock in the separation space. This reduces the resistance encountered by the drill rod 1 during the drilling process and improves the stability and efficiency of the drilling. The outer surface of the drill rod 1 is provided with protrusions to increase the surface roughness of the drill rod 1, thereby improving the crushing efficiency during the rock drilling process and ensuring that the rock is crushed to the point that it can be discharged along the guide grooves 11 to improve the rock drilling efficiency.

[0029] Example 3 Based on Example 2, such as Figures 1-6 As shown, a method for drilling into the space between layers in coal mining, based on the aforementioned drilling device for drilling into the space between layers in coal mining, includes the following specific steps: Step 1: Rotate the drill rod 1 into the rock stratum. As the drill rod 1 rotates and moves, the drilled rock stratum first enters the innermost casing 2, and the impurities on the outer wall of the drill rod 1 are discharged into the borehole along the guide groove 11. Step 2: Move the connecting ring 6 in the opposite direction to the travel of drill rod 1. The connecting ring 6 drives the pneumatic rod 7 to move. The telescopic part of the pneumatic rod 7 drives the inner shell 2 to move through the connecting rope 8. Step 3: During the movement of the inner shell 2, the inner shell 2 squeezes the adjacent elastic element 3 until the inner elastic element 3 is compressed to its limit. The inner shell 2 drives the outer adjacent shell 2 to move through the adjacent elastic element 3. Repeat this step so that the multiple shells 2 move from the inside to the outside in sequence, and the rock core enters all the shells 2 in sequence. Step 4: During the movement of the casing 2, all trapezoidal blocks 201 on it are moved until the stop block 202 contacts and squeezes the adjacent trapezoidal blocks 201. All trapezoidal blocks 201 on the casing 2 are deformed, so that the casing 2 is deformed and clamps the drilled rock core. Step 5: When the drill rod 1 is inserted into the rock layer to its limit, the drill rod 1 drives the compression ring 5 to move. The compression ring 5 compresses all the pressure plates 4, causing the outermost shell 2 to deform and clamp the rock core. Step 6: When the sampled rock layer is clamped and all the shells 2 are inserted into the rock layer to the limit, all the elastic elements 3 are compressed to the limit. As the connecting ring 6 drives the pneumatic rod 7 to continue moving, the telescopic part of the pneumatic rod 7 extends, and the tension spring 9 is stretched. During the extension of the telescopic part of the pneumatic rod 7, the gas inside the pneumatic rod 7 is forced into all the airbags 10 through multiple conduits. The airbags 10 expand and clamp the corresponding shells 2. Step 7: After all the casings 2 are removed from the drill rod 1, the tension spring 9 rebounds, causing the telescopic part of the air pressure rod 7 to contract. The gas in all the air bladders 10 is drawn back into the air pressure rod 7, and the air bladders 10 no longer clamp the corresponding casings 2. All casings 2 are struck to remove the rock cores inside all casings 2. All the elastic elements 3 rebound in sequence to reset the casings 2.

[0030] The present invention has been described in detail above with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the coal mining separation space drilling device and method of the present invention. Of course, the specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drilling device for drilling into the space between layers in coal mining, comprising a drill rod, characterized in that, The drill pipe contains several sleeves nested together, with the inner diameter of all sleeves decreasing sequentially from the outside to the inside. Between two adjacent sleeves, there are circumferentially distributed trapezoidal blocks and circumferentially distributed stop blocks. The trapezoidal blocks are fixed to the outer surface of the adjacent sleeves, and the stop blocks are fixed to the inner surface of the adjacent sleeves. The stop blocks are used to compress the adjacent trapezoidal blocks. Between two adjacent sleeves, there are several circumferentially distributed elastic elements. The outermost sleeve is fixed with circumferentially uniformly distributed pressure plates. Inside the drill pipe, there is a compression ring for compressing all the pressure plates.

2. The coal mining separation space drilling device according to claim 1, characterized in that, From the inner shell to the outer shell, the elastic coefficients of all the elastic elements increase sequentially.

3. The coal mining separation space drilling device according to claim 2, characterized in that, A connecting ring is slidably connected inside the drill rod, and a pneumatic rod is fixedly connected to the connecting ring. A connecting rope is fixedly connected between the telescopic part of the pneumatic rod and the inner sleeve, and a tension spring is fixedly connected between the telescopic part and the fixed part of the pneumatic rod.

4. A coal mining separation space drilling device according to claim 3, characterized in that, The elastic element is fixedly connected to an airbag, which is located between two adjacent shells. The material of the shell located on the outside of the airbag is rigid, while the rest of the shell is made of elastic material. The airbag is internally connected to the pneumatic rod.

5. A coal mining separation space drilling device according to claim 4, characterized in that, The thickness of the airbag gradually decreases from the point away from the compression ring to the point closer to it.

6. A coal mining separation space drilling device according to claim 5, characterized in that, The spring constant is greater than the spring constant of all the elastic elements.

7. A coal mining separation space drilling device according to claim 6, characterized in that, The drill pipe is provided with several guide grooves, which are used to guide impurities.

8. A coal mining separation space drilling device according to claim 7, characterized in that, The guide groove is threaded.

9. A coal mining separation space drilling device according to claim 8, characterized in that, The outer surface of the drill rod is provided with protrusions to increase the surface roughness of the drill rod.

10. A method for drilling into the space between layers in coal mining, using the drilling device for drilling into the space between layers in coal mining as described in claim 9, characterized in that, The method steps are as follows: Step 1: Rotate the drill rod and insert it into the rock strata. As the drill rod rotates and moves, the drilled rock strata first enter the innermost casing, and impurities on the outer wall of the drill rod are discharged into the borehole along the guide groove. Step 2: Move the connecting ring in the opposite direction to the drill pipe's travel. The connecting ring drives the pneumatic rod to move, and the telescopic part of the pneumatic rod drives the inner casing to move through the connecting rope. Step 3: During the movement of the inner shell, the inner shell squeezes the adjacent elastic elements until the inner elastic elements are compressed to their limit. The inner shell then drives the adjacent outer shell to move through the adjacent elastic elements. This step is repeated so that the multiple shells move sequentially from the inside to the outside, and the rock core enters all the shells in sequence. Step 4: During the movement of the casing, all the trapezoidal blocks on it move until the stop block contacts and squeezes the adjacent trapezoidal blocks. Deformation occurs at all the trapezoidal blocks on the casing, causing the casing to deform and clamp the drilled rock core. Step 5: When the drill rod is inserted into the rock layer to its limit, the drill rod drives the compression ring to move. The compression ring squeezes all the pressure plates, causing the outermost shell to deform and clamp the rock core. Step 6: When the sampled rock layer is clamped and all the shells are inserted into the rock layer to the limit, all elastic elements are compressed to the limit. As the connecting ring drives the pneumatic rod to continue moving, the telescopic part of the pneumatic rod extends and the tension spring is stretched. During the extension of the telescopic part of the pneumatic rod, the gas inside the pneumatic rod is forced into all the air bladders through multiple conduits. The air bladders expand and clamp the corresponding shells. Step 7: After all the casings are removed from the drill pipe, the tension springs rebound, causing the telescopic part of the pneumatic rod to contract. The gas in all the airbags is drawn back into the pneumatic rod, and the airbags no longer clamp the corresponding casings. All casings are then struck to remove the rock cores from all the casings. All the elastic elements rebound in sequence, resetting the casings.

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