A coal mining separation layer space drilling device and method

Abstract

The present application provides a kind of coal mining delamination space drilling device and method, it is related to coal rock drilling technology field.The present application includes drill pipe, several sleeve shells are arranged in the drill pipe, the inner diameter of all sleeve shells gradually decreases from outside to inside, adjacent two sleeve shells are provided with circumferentially distributed trapezoidal blocks and circumferentially distributed stop blocks, the stop block is used to extrude adjacent trapezoidal block, and several elastic members are fixedly connected between adjacent two sleeve shells.The present application collects the rock core drilled by multilayer sleeve shell in section, in the process of segmented collection of rock core, the opening of all sleeve shells is sequentially deformed, the rock core is clamped, to ensure the stability of the form of rock core, reduce the probability of change of rock core due to the existence of gap in delamination space, to ensure the accuracy of sampling result, to ensure the accuracy of delamination space distribution judgment, to ensure the normal mining of coal mine subsequently.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal rock drilling, in particular to a coal mining separation space drilling device and method. BACKGROUND

[0002] The coal mining separation space refers to the cavity and gap formed between different rock layers due to deformation difference after the overburden rock (overburden layer) above the coal seam is fractured and deformed under the influence of mining. In the process of coal mining, in order to master the distribution of the separation space in the coal seam, it is often necessary to drill the rock layer. However, when the traditional core drilling technology is applied to the separation space with loose structure, a large number of voids or soft interlayers, the following significant technical problems are faced: the rock layer distribution in the separation space is uneven, there are voids, and in the drilling and pulling process of the traditional coring method, the core will actively fill the gap, causing the rock layer position to move, especially difficult to maintain the original structure and hierarchical relationship of the soft and broken rock layer, which will cause the extracted sample to be unable to truly reflect the state of the separation space, and further seriously affect the accuracy of the judgment of the separation space distribution. SUMMARY

[0003] In order to overcome the shortcomings presented in the background art, the present application provides a coal mining separation space drilling device and method.

[0004] In order to achieve the above purpose, the technical solution adopted by the present application is as follows:

[0005] A coal mining separation space drilling device, comprising a drill rod, a plurality of sleeve shells are arranged in the drill rod, the inner diameters of all the sleeve shells decrease from outside to inside in turn, a plurality of trapezoidal blocks and a plurality of stop blocks are arranged in a circumferential direction between adjacent two sleeve shells, the trapezoidal blocks are fixedly connected to the outer side surfaces of the adjacent sleeve shells, the stop blocks are fixedly connected to the inner side surfaces of the adjacent sleeve shells, the stop blocks are used for pressing the adjacent trapezoidal blocks, a plurality of elastic members are fixedly connected in a circumferential direction between adjacent two sleeve shells, a plurality of pressure receiving sheets are fixedly connected to the outermost sleeve shell in a circumferential uniform distribution, and an extrusion ring for extruding all the pressure receiving sheets is fixedly connected in the drill rod.

[0006] More preferably, the elastic coefficients of all the elastic members increase in turn from the inner sleeve shell to the outer sleeve shell.

[0007] More preferably, a connecting ring is slidingly connected in the drill rod, the connecting ring is fixedly connected with a gas pressure rod, a connecting rope is fixedly connected between the telescopic part of the gas pressure rod and the inner sleeve shell, and a tension spring is fixedly connected between the telescopic part and the fixed part of the gas pressure rod.

[0008] More preferably, the elastic member is fixed with an air bag, the air bag is located between two adjacent shells, the material of the shell on the outside of the air bag is hard, the rest of the shell is elastic material, and the air bag is in communication with the inside of the air pressure rod.

[0009] More preferably, the thickness of the air bag gradually decreases from the position far away from the extrusion ring to the position close to the extrusion ring.

[0010] More preferably, the elastic coefficient of the tension spring is greater than the elastic coefficient of all the elastic members.

[0011] More preferably, the drill rod is provided with a plurality of guide grooves for guiding impurities.

[0012] More preferably, the guide groove is thread-like.

[0013] More preferably, the outer surface of the drill rod is provided with a protrusion to increase the roughness of the surface of the drill rod.

[0014] A coal mining separation space drilling method, using the above-mentioned coal mining separation space drilling device, the method steps are as follows:

[0015] Step 1: rotate the drill rod into the rock stratum, in the process of rotating the drill rod, the drilled rock stratum first enters the innermost shell, and the impurities on the outer wall of the drill rod are discharged from the drill hole along the guide groove;

[0016] Step 2: move the connecting ring in the opposite direction of the drill rod, the connecting ring drives the air pressure rod to move, and the telescopic part of the air pressure rod drives the inner shell to move through the connecting rope;

[0017] Step 3: in the process of moving the inner shell, the inner shell extrudes the adjacent elastic member until the inner elastic member is compressed to the limit state, the inner shell drives the adjacent outer shell to move through the adjacent elastic member, and the step is repeated, so that the multiple shells move from inside to outside in turn, and the rock core enters all the shells in turn;

[0018] Step 4: the shell moves all the trapezoidal blocks on it, until the stop block contacts and extrudes the adjacent trapezoidal block, the deformation occurs at all the trapezoidal blocks on the shell, so that the shell deforms and clamps the drilled rock core;

[0019] Step 5: when the drill rod is inserted into the rock stratum to the limit state, move the extrusion ring through the drill rod, the extrusion ring extrudes all the pressed sheets, so that the outermost shell deforms and clamps the rock core;

[0020] Step 6: when the sampled rock stratum is clamped, all the sleeves are inserted into the rock stratum to the limit state, all the elastic members are compressed to the limit state, the telescopic part of the air pressure rod is stretched out, the tension spring is stretched, in the process that the telescopic part of the air pressure rod is stretched out, the gas in the air pressure rod is compressed into all the air bags through the plurality of pipes, the air bags are inflated and clamp the corresponding sleeves;

[0021] Step 7: when all the sleeves are taken out of the drill rod, the tension spring rebounds, the telescopic part of the air pressure rod is retracted, the gas in all the air bags is drawn back into the air pressure rod, the air bags no longer clamp the corresponding sleeves, all the sleeves are knocked, the cores in all the sleeves are taken out, all the elastic members rebound in turn, and the sleeves are reset.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] The present application collects the cores drilled by the drill rod in sections through the plurality of sleeves, in the process that the cores are collected in sections, the openings of all the sleeves deform in turn, the cores are clamped to ensure the stability of the cores, the probability that the cores change due to the existence of the gap in the bed separation space is reduced, the accuracy of the sampling result is ensured, the accuracy of the judgment on the distribution of the bed separation space is ensured, the normal mining of the coal mine is ensured, the inner sleeve is moved by the telescopic part of the air pressure rod, all the sleeves move in turn, the extrusion force generated by the sleeves on the cores is reduced, the probability that the cores deform is reduced, and when the rock stratum is drilled, the sleeves are kept in the compressed state by the inflation of the air bags, the accuracy of the drilled cores is ensured, the impurities are discharged from the drill hole through the guide groove, the probability that the movement of the drill rod is blocked due to the continuous falling of the rock stratum in the bed separation space is reduced, the resistance of the drill rod in the drilling process is reduced, and the stability and efficiency of the drill rod in the drilling process are improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a perspective structural schematic view of the present application;

[0025] Figure 2 It is a perspective structural sectional view of the drill rod of the present application;

[0026] Figure 3 It is a perspective structural sectional view of the sleeve of the present application;

[0027] Figure 4 It is a perspective structural schematic view of the elastic member of the present application;

[0028] Figure 5 It is a perspective structural schematic view of the tension spring of the present application;

[0029] Figure 6 It is a perspective structural schematic view of the air bag of the present application.

[0030] The marks of the parts in the drawings are as follows:

[0031] 1. drill rod, 2. casing, 201. trapezoidal block, 202. stop block, 3. elastic member, 4. pressure receiving piece, 5. extrusion ring, 6. connecting ring, 7. air pressure rod, 8. connecting rope, 9. tension spring, 10. air bag, 11. guide groove. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and beneficial effects of the present application clearer, the following will further describe the present application in combination with specific embodiments and with reference to the drawings. Some of the embodiments of the present application will be described more fully with reference to the accompanying drawings, in which some but not all of the embodiments will be shown. In fact, the various embodiments of the present application can be implemented in a multitude of different forms and should not be construed as limited to the number of set out embodiments; rather, these embodiments are provided so that the present application meets the applicable legal requirements.

[0033] In the description of the present application, it should be noted that the terms "inner", "outer", "upper", "lower", "front", "back", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] Example 1

[0035] The traditional core drilling technology faces the following significant technical problems when applied to the delamination space of loose structure, large amount of voids or soft interlayer: the internal rock distribution of the delamination space is uneven, there are voids, and in the process of drilling and pulling out, the core will actively fill the gap, causing the position of the rock layer to be dislocated, especially difficult to maintain the original structure and hierarchical relationship of the soft and broken rock layer, which will cause the sample taken to be unable to truly reflect the state of the delamination space, and further seriously affect the accuracy of the judgment of the delamination space distribution.

[0036] A coal mining delamination space drilling device, such as Figures 1-4The drill rod 1 is used for being installed to a driving device, the driving device is a prior structure and is not shown in the figure, the driving device is used for driving the drill rod 1 to rotate and move, a plurality of sleeve shells 2 are arranged in the drill rod 1, the sleeve shell 2 is provided with a plurality of through grooves which are uniformly distributed in the circumference, the left part of the sleeve shell 2 is made of elastic material, when the outside of the left part of the sleeve shell 2 is pressed, the sleeve shell 2 is deformed, so that the inner diameter of the left side of the sleeve shell 2 is reduced, the inner diameters of all the sleeve shells 2 are sequentially reduced from outside to inside, a plurality of trapezoidal blocks 201 and a plurality of stop blocks 202 which are circumferentially distributed are arranged between the adjacent two sleeve shells 2, the trapezoidal block 201 is fixedly connected with the outside surface of the adjacent sleeve shell 2, the stop block 202 is fixedly connected with the inside surface of the adjacent sleeve shell 2, when the inner sleeve shell 2 moves to the right, the sleeve shell 2 drives all the stop blocks 202 thereon to move to the right, accompanied by the trapezoidal block 201 moving to contact the adjacent stop block 202, the trapezoidal block 201 continues to move, the stop block 202 extrudes the adjacent trapezoidal block 201, the deformation occurs at all the trapezoidal blocks 201 on the sleeve shell 2, so that the inner diameter of the left side of the sleeve shell 2 is reduced, a plurality of elastic elements 3 which are circumferentially distributed are fixedly connected between the adjacent two sleeve shells 2, the elastic coefficients of all the elastic elements 3 are sequentially increased from the inner sleeve shell 2 to the outer sleeve shell 2, when the inner sleeve shell 2 moves to the right, the sleeve shell 2 extrudes the adjacent elastic element 3, so that the inner elastic element 3 is deformed under pressure, until the inner elastic element 3 is compressed to the limit state, the inner sleeve shell 2 drives the adjacent outer sleeve shell 2 to move to the right through the adjacent elastic element 3, the step is repeated, so that the plurality of sleeve shells 2 move to the right from inside to outside, the outermost sleeve shell 2 is fixedly connected with a plurality of pressure receiving pieces 4 which are uniformly distributed in the circumference, the extrusion ring 5 for extruding all the pressure receiving pieces 4 is fixedly connected in the drill rod 1, the extrusion ring 5 is driven to move to the right through the drill rod 1, the extrusion ring 5 extrudes all the pressure receiving pieces 4, all the pressure receiving pieces 4 clamp the rock core, so as to pull out the rock core, the rock core is collected in sections through the plurality of sleeve shells 2, in the process of collecting the rock core in sections, the openings of all the sleeve shells 2 are sequentially deformed, the rock core is clamped, so as to ensure the stability of the shape of the rock core, reduce the probability that the rock core changes due to the existence of the gap in the separation space, thus ensure the accuracy of the rock core, and further ensure the accuracy of judging the distribution of the separation space, so as to ensure the normal mining of the coal mine in the future.

[0037] As Figures 2-6As shown, the drill rod 1 is slidably connected with the connecting ring 6, the connecting ring 6 is fixedly connected with the air pressure rod 7, the telescopic part of the air pressure rod 7 is fixedly connected with the connecting rope 8 between the inner layer sleeve 2, the telescopic part of the air pressure rod 7 is fixedly connected with the tension spring 9 between the fixed part, when the core needs to be pulled out, the air pressure rod 7 is driven to move rightwards through the connecting ring 6, the telescopic part of the air pressure rod 7 drives the inner layer sleeve 2 to move rightwards through the connecting rope 8, since the elastic coefficient of the tension spring 9 is greater than the elastic coefficient of all the elastic members 3, and all the elastic members 3 are compressed to the limit state, therefore, when all the sleeves 2 are sequentially moved to the limit state rightwards, the telescopic part of the air pressure rod 7 is just extended, and the tension spring 9 is just stretched, the elastic member 3 is fixedly connected with the air bag 10, the thickness of the air bag 10 gradually decreases from the position far away from the extrusion ring 5 to the position close to it, so as to guarantee the pressure degree and deformation amount of the right part of the sleeve 2, thereby guaranteeing the intensity of the sleeve 2 clamping the core, the air bag 10 is located between the adjacent two sleeves 2, the material of the position of the sleeve 2 outside the air bag 10 is rigid, and the rest positions of the sleeve 2 are elastic material, the air bag 10 is communicated with the inside of the air pressure rod 7 through the conduit, the length of the conduit can meet the movement of the air bag 10, the conduit can be protected by setting the protective sleeve outside the conduit, the stability of the conduit in the movement process is guaranteed, and the movement of the sleeve 2 is not affected by the conduit, in the process of the telescopic part of the air pressure rod 7 extending, the gas in the air pressure rod 7 is compressed into all the air bags 10 through the plurality of conduits, the air bag 10 is inflated and clamps the left half of the corresponding sleeve 2, the right half of the innermost sleeve 2 is solid, and after all the sleeves 2 are sequentially moved to the limit state rightwards, the left half of the inner layer sleeve 2 is located in the right half of the outer layer adjacent sleeve 2, so as to ensure that all the air bags 10 clamp the left half of the corresponding sleeve 2, and the core segments are also respectively located in the left half of the corresponding sleeve 2, so as to guarantee that the core is clamped by the sleeve 2, in the process of drilling, the inner layer sleeve 2 is moved by the telescopic part of the air pressure rod 7, all the sleeves 2 are sequentially moved, so that the extrusion force of the sleeve 2 to the core is reduced, the probability of the core deformation is reduced, and when the rock stratum drilling is completed, the inflation of the air bag 10 is utilized to keep the sleeve 2 as a whole in the state of being compressed, thereby guaranteeing the accuracy of the core.

[0038] The specific working principle is as follows:

[0039] When the operator needs to use the device to drill the coal rock stratum, the operator installs the drill rod 1 to the driving equipment, the driving equipment drives the drill rod 1 to rotate, the drill rod 1 is inserted into the rock stratum in the rotating process, in the rotating process of the drill rod 1, the drilled rock stratum first enters the innermost sleeve 2, at this time, the operator moves the connecting ring 6 rightwards, the connecting ring 6 drives the air pressure rod 7 to move rightwards, the telescopic part of the air pressure rod 7 drives the inner layer sleeve 2 to move rightwards through the connecting rope 8.

[0040] In the process of moving the inner sleeve 2 to the right, the inner sleeve 2 extrudes the adjacent elastic member 3, so that the inner elastic member 3 is deformed under pressure, until the inner elastic member 3 is compressed to the limit, the inner sleeve 2 drives the adjacent outer sleeve 2 to move to the right through the adjacent elastic member 3, repeating this step, so that the multi-layer sleeve 2 moves to the right from the inside to the outside, and the core enters all the sleeves 2 in turn.

[0041] When the sleeve 2 moves to the right, the sleeve 2 drives all the trapezoidal blocks 201 on it to move to the right, accompanied by the trapezoidal blocks 201 moving to contact the adjacent stop blocks 202, the trapezoidal blocks 201 continue to move, the stop blocks 202 extrude the adjacent trapezoidal blocks 201, and the deformation occurs at all the trapezoidal blocks 201 on the sleeve 2, so that the inner diameter of the left side of the sleeve 2 decreases. Through the multi-layer sleeve 2, the core is collected in sections, and in the process of collecting the core in sections, the openings of all the sleeves 2 deform in turn, the core is clamped to ensure the stability of the core, reduce the probability of changes in the core due to the existence of gaps in the separation space, thereby ensuring the accuracy of the core, and further ensuring the accuracy of the judgment of the separation space distribution, so as to ensure the normal mining of the coal mine.

[0042] When the drill rod 1 is inserted into the rock layer to the limit, the extrusion ring 5 is driven to move to the right through the drill rod 1, the extrusion ring 5 extrudes all the pressure plates 4, and all the pressure plates 4 clamp the core, so as to pull out the core.

[0043] When the sampled rock layer is clamped, all the sleeves 2 move to the right to the limit, and all the elastic members 3 are compressed to the limit, accompanied by the air pressure rod 7 continuing to move to the right driven by the connecting ring 6, the extension part of the air pressure rod 7 extends, and the tension spring 9 is stretched. In the process of extending the extension part of the air pressure rod 7, the gas in the air pressure rod 7 is compressed into all the air bags 10 through multiple conduits, the air bags 10 inflate and clamp the corresponding sleeve 2, the inflation of the air bags 10 makes the sleeve 2 as a whole keep being pressed, thereby ensuring the accuracy of the core.

[0044] When all the sleeves 2 are taken out of the drill rod 1, the tension spring 9 rebounds, the extension part of the air pressure rod 7 contracts, the gas in all the air bags 10 is sucked back into the air pressure rod 7, the air bags 10 no longer clamp the corresponding sleeve 2, all the sleeves 2 are knocked, the core in all the sleeves 2 is poured out, all the elastic members 3 rebound in turn, the sleeves 2 move to the left, and all the sleeves 2 are inserted back into the drill rod 1 for the next use.

[0045] Example 2

[0046] On the basis of example 1, as Figure 1 and Figure 2As shown, the drill rod 1 is provided with a plurality of guide grooves 11, which guide impurities during the drilling of the coal rock stratum by the drill rod 1. The guide grooves 11 are thread-like and have a helical direction opposite to the rotation direction of the drill rod 1. During the rotation of the drill rod 1, the impurities (rock stratum debris continuously falling during the drilling of the drill rod 1) are discharged from the borehole along the guide grooves 11, reducing the probability of the drill rod 1 being blocked by the continuous falling of the rock stratum in the separation space, thereby reducing the resistance during the drilling of the drill rod 1 and improving the stability and efficiency of the drilling of the drill rod 1. The outer surface of the drill rod 1 is provided with protrusions to increase the roughness of the surface of the drill rod 1, thereby improving the crushing efficiency during the drilling of the rock stratum, and further ensuring that the rock is crushed to be discharged along the guide grooves 11 to improve the drilling efficiency of the rock stratum.

[0047] Embodiment 3

[0048] Based on embodiment 2, as shown in Figures 1-6 A coal mining separation space drilling method based on the above-mentioned coal mining separation space drilling device, the specific steps are as follows:

[0049] Step 1: Rotate the drill rod 1 and insert it into the rock stratum. During the rotation and travel of the drill rod 1, the drilled rock stratum first enters the innermost casing 2, and the impurities at the outer wall of the drill rod 1 are discharged from the borehole along the guide grooves 11;

[0050] Step 2: Move the connecting ring 6 in the opposite direction of the travel of the drill rod 1, and the connecting ring 6 drives the air pressure rod 7 to move. The telescopic part of the air pressure rod 7 drives the inner casing 2 to move through the connecting rope 8;

[0051] Step 3: During the movement of the inner casing 2, the inner casing 2 compresses the adjacent elastic member 3 until the inner elastic member 3 is compressed to the limit state. The inner casing 2 drives the adjacent outer casing 2 to move through the adjacent elastic member 3. Repeat this step to make the multiple casings 2 move from the inside to the outside in turn, and the rock core enters all the casings 2 in turn;

[0052] Step 4: During the movement of the casing 2, all the trapezoidal blocks 201 on the casing 2 are moved until the stop block 202 contacts and compresses the adjacent trapezoidal block 201. The deformation occurs at all the trapezoidal blocks 201 on the casing 2, so that the casing 2 is deformed and clamps the drilled rock core;

[0053] Step 5: When the drill rod 1 is inserted into the rock stratum to the limit state, the extrusion ring 5 is driven to move by the drill rod 1, and the extrusion ring 5 extrudes all the pressure plates 4, so that the outermost casing 2 is deformed and clamps the rock core;

[0054] Step 6: When the sampled rock stratum is clamped, all the casings 2 are inserted into the rock stratum to the limit state, all the elastic members 3 are compressed to the limit state, and then the connecting ring 6 drives the air pressure rod 7 to continue to move, the telescopic part of the air pressure rod 7 is stretched out, the tension spring 9 is stretched, and in the process of stretching out of the telescopic part of the air pressure rod 7, the gas in the air pressure rod 7 is compressed into all the air bags 10 through multiple conduits, the air bags 10 are inflated and clamp the corresponding casings 2;

[0055] Step 7: When all the casings 2 are taken out of the drill rod 1, the tension spring 9 rebounds, the telescopic part of the air pressure rod 7 is retracted, the gas in all the air bags 10 is sucked back into the air pressure rod 7, the air bags 10 no longer clamp the corresponding casings 2, all the casings 2 are knocked, the rock cores in all the casings 2 are taken out, and all the elastic members 3 rebound in turn to reset the casings 2.

[0056] So far, the embodiment has been described in detail in combination with the drawings. According to the above description, those skilled in the art should have a clear understanding of the coal mining separation space drilling device and method. Of course, the above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above-described specific embodiments are only for the specific embodiments of the present application and are not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

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 are circumferentially distributed trapezoidal blocks and circumferentially distributed stop blocks. The trapezoidal blocks are fixed to the outer surfaces of adjacent sleeves, and the stop blocks are fixed to the inner surfaces of adjacent sleeves. The stop blocks are used to compress adjacent trapezoidal blocks. Between two adjacent sleeves are several circumferentially distributed elastic elements, each with an air bladder fixed to it. The air bladder is located between two adjacent sleeves. The material on the sleeve outside the air bladder is rigid, while the remaining parts of the sleeve are made of elastic material. The outermost sleeve is fixed with circumferentially evenly distributed pressure plates. A compression ring is fixed inside the drill pipe to compress 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 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.

Images