A coal mine drilling sampling device

Abstract

The application discloses a coal mine drilling sampling device and belongs to the technical field of coal mine drilling sampling equipment, which comprises a main drill bit assembly, a drilling rod assembly, a side wall sampling drill bit and a drill bit extension assembly, the main drill bit assembly is installed at the bottom of the drilling rod assembly, the side wall sampling drill bit is assembled on the drill bit extension assembly, and the drill bit extension assembly is wholly arranged in the drilling rod assembly; the main drill bit assembly is internally provided with a miniature hydraulic assembly and a telescopic variable pitch drill bit, integrated with three functions of an axial hole, coal core cutting and sampling cavity plugging; a hydraulic control system arranged in the drilling rod assembly uniformly drives the actions of each mechanism; the drill bit extension assembly adopts a hydraulic linkage lever structure and can drive the side wall sampling drill bit to extend and adhere to the side wall of a drilling hole for sampling; the side wall sampling drill bit is provided with motor gear transmission, forward and reverse conversion and core breaking, and elastic anti-falling limiting functions, thereby achieving the technical effect of axial and side wall dual-station coal core sampling and greatly simplifying the underground exploration process.

Description

Technical Field

[0001] This invention belongs to the technical field of coal mine drilling and sampling equipment, specifically referring to a coal mine drilling and sampling device. Background Technology

[0002] In coal mine geological exploration, core drilling is a core procedure for obtaining geological parameters such as coal seam thickness, coal quality, and rock strata distribution. Currently, conventional coal mine drilling and sampling equipment has relatively limited functions, and most can only collect coal cores along the borehole axis. It cannot simultaneously sample coal seams on the borehole sidewalls. If sidewall coal samples need to be collected, specialized equipment must be used for secondary drilling, which is cumbersome, has a long construction period, and significantly reduces exploration efficiency.

[0003] Meanwhile, existing coring drill bits have simple structures, with sampling chambers mostly being open structures. During drilling operations, coal slag and rock cuttings can easily enter the chamber, causing blockage of the coring channel. Furthermore, the coal core cutting mechanism and the sealing mechanism are independent of each other, resulting in a large number of parts. The oil circuit and transmission structure are all exposed, making them prone to failures such as pipeline wear, component jamming, and coal core detachment under complex underground working conditions, resulting in a low coal core sampling recovery rate. In addition, traditional sidewall sampling mechanisms are mostly externally arranged, which are prone to scraping and colliding with the well wall during drilling. The components have poor protection and short service life. The overall equipment has low integration and unreasonable spatial layout, making it difficult to meet the integrated drilling and sampling operation requirements of deep mines and complex coal seams. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a coal mine drilling and sampling device, which effectively solves the above problems.

[0005] The technical solution adopted by this invention is as follows: This invention proposes a coal mine drilling and sampling device, including a main drill bit assembly, a drill rod assembly, a sidewall sampling drill bit, and a drill bit extension assembly. The main drill bit assembly is located at the bottom of the drill rod assembly, the sidewall sampling drill bit is located on the drill bit extension assembly, and the drill bit extension assembly is located inside the drill rod assembly. The main drill bit assembly includes a coring drill rod, a bottom drill bit, a variable pitch drill bit, and a micro hydraulic assembly. The bottom drill bit is fixed to the bottom of the coring drill rod by bolts. The variable pitch drill bit is slidably arranged in a circular array on the bottom drill bit. The micro hydraulic assembly is located inside the bottom drill bit and controls the sliding adjustment of the variable pitch drill bit.

[0006] Furthermore, the core drill rod has a sampling cavity at its center, a guide hole at its edge, and an annular groove at the top of the bottom drill bit, which connects to the guide hole. The bottom drill bit has a pipe hole, a hydraulic groove, a variable pitch groove, and a cutting edge in an annular array. The variable pitch groove is located on the side of the cutting edge, and the hydraulic groove is located on the side wall of the variable pitch groove. The pipe hole connects the hydraulic groove and the annular groove. The variable pitch drill bit is slidably disposed within the variable pitch groove, and a side wall frame is provided on the side wall of the variable pitch drill bit, which is slidably disposed within the hydraulic groove.

[0007] Preferably, the central sampling chamber of the coring drill rod can directly accommodate axial coal cores, integrating the coring channel with a compact structure. The edge guide holes connect to the hydraulic pipeline, enabling an internal oil circuit arrangement that is less prone to wear and prevents coal slag blockage. The variable pitch drill bit can extend and retract along the slide, serving three functions: opening holes, sealing the sampling chamber, and cutting coal cores, making it a multi-purpose tool.

[0008] Furthermore, the micro hydraulic assembly includes a micro hydraulic rod, a hydraulic ring pipe, and a ring pipe groove cover plate. The micro hydraulic rod is disposed in a hydraulic groove, the hydraulic ring pipe is disposed in a ring pipe groove, and the ring pipe groove cover plate is fastened to the ring pipe groove. The front end of the micro hydraulic rod is provided with a connecting boss, which is snapped into the side wall frame. The hydraulic ring pipe and the micro hydraulic rod are connected through a hydraulic pipe.

[0009] Furthermore, the drill rod assembly includes a drill rod body, a hydraulic control system, and a feed column. The core drill rod is fixed to the bottom of the drill rod body by bolts. The hydraulic control system is located inside the lower side of the drill rod body. The hydraulic ring pipe is connected to the hydraulic control system through a hydraulic pipe passing through a guide hole. The feed column is slidably disposed within the drill rod body.

[0010] Furthermore, the drill rod body has a drill bit groove in the middle, a side core storage groove at the center above the drill bit groove, a material feed column chute at the center below the drill bit groove, a hydraulic control system at the bottom of the material feed column chute via a hydraulic pipe, and a hydraulic device groove at the bottom of the drill bit groove, which is located on one side of the material feed column chute.

[0011] Furthermore, the drill bit groove has symmetrical sliding column guide grooves on the center of both sides of the side wall, and symmetrical extension plate rotating column and control rod sliding groove at the bottom of both sides of the drill bit groove. The extension plate rotating column is located at the center of the drill bit groove, and symmetrical side rod through grooves are provided on both sides of the bottom of the drill bit groove. The side rod through grooves are connected to the hydraulic device groove.

[0012] Preferably, the drill pipe body is divided into sections with drill bit slots, side core storage slots, and various sliding grooves and through slots. The cavity layout is reasonable, all actuators are built-in, and the protection is strong, avoiding coal collisions and wear on the internal structure. The sliding grooves and through slots serve to limit and guide, ensuring precise movement of each component and preventing jamming. The retractable feed column realizes the dual functions of mechanism locking and coal core pushing. After sampling, it automatically pushes the sidewall coal core to the side core storage slot.

[0013] Furthermore, the front end of the sidewall sampling drill bit is provided with a cutting head, the rear side of the cutting head is provided with a cutting blade rotation groove, a cutting blade is rotatably disposed in the cutting blade rotation groove, the outer wall of the middle part of the sidewall sampling drill bit is provided with a drill bit gear, the rear end of the sidewall sampling drill bit is provided with a circular array of anti-detachment component grooves, a coal core anti-detachment component is slidably disposed in the anti-detachment component grooves, the side wall of the coal core anti-detachment component is provided with an anti-detachment component spring, and the end of the anti-detachment component spring is disposed on the inner wall of the anti-detachment component groove.

[0014] Preferably, the cutting head of the sidewall sampling drill bit has high hardness, which can efficiently cut the coal seam on the sidewall of the borehole, resulting in high sampling efficiency. It has a built-in cutting blade, and the core can be fed and cut off by switching between forward and reverse directions without the need for additional mechanisms. The core cutting action is flexible. The drill bit gear is integrated on the outer wall and directly cooperates with the motor drive. The transmission structure is simple and compact. It is equipped with a coal core anti-detachment component, which firmly locks the coal core after sampling and improves the coal core recovery rate.

[0015] Furthermore, the drill bit extension assembly includes a drill bit fixing device and a drive motor. The drill bit fixing device is located in the drill bit groove and has a drive cavity inside. The drill bit fixing device has symmetrical sliding columns and rotating columns at both ends. The sliding columns are slidably disposed in the sliding column guide groove. The sidewall sampling drill bit is rotatably disposed on the drill bit fixing device. The drive motor is disposed in the drive cavity. The output shaft of the drive motor is provided with a motor gear, and the motor gear is meshed with the drill bit gear.

[0016] Furthermore, the drill bit extension assembly also includes an extension plate and a rotation control rod. The extension plate has a rotation hole at its bend, a long sliding groove on its long arm, and a short sliding groove on its short arm. The rotation hole is rotatably mounted on the extension plate's rotation column, and the sliding column is also slidably mounted in the long sliding groove. The rotation control rod is slidably mounted in the control rod groove, and the top of the rotation control rod is rotatably mounted on the rotation column.

[0017] Preferably, the extension plate and the rotation control rod adopt a lever rotation structure, which ensures stable mechanical transmission and converts hydraulic power into drill bit swinging motion with low transmission loss; the long and short slides are adapted to different strokes, the stroke is controllable, and the swing angle is precise.

[0018] Furthermore, the drill bit extension assembly also includes a control sub-plate and a hydraulic control plate. The control sub-plate is disposed in the hydraulic device groove, and side rods are symmetrically arranged on both sides of the control sub-plate. The side rods are slidably disposed in the side rod through grooves, and a side rod sliding column is provided at the top of the side rod. The side rod sliding column slides in a short sliding groove. The hydraulic control plate is disposed in the hydraulic device groove, and a hydraulic plate control rod is provided at the bottom of the hydraulic control plate. A hydraulic plate spring is provided at the edge of the hydraulic control plate, and the bottom of the hydraulic plate spring is connected to the control sub-plate. The hydraulic plate control rod is connected to the hydraulic control system through a hydraulic pipe.

[0019] The beneficial effects achieved by the present invention using the above structure are as follows: 1. This device integrates axial coring and borehole sidewall sampling functions. One device can complete the collection of two types of samples, axial coal core and sidewall coal core, without the need to change tools and drill twice. This simplifies the underground operation process, shortens the construction time, and is suitable for different geological exploration sampling needs in coal mines, making it more versatile.

[0020] 2. The hydraulic pipeline is arranged using the guide holes and annular grooves inside the drill rod and drill bit, achieving full internal oil circuitry. This effectively avoids pipeline damage and oil leakage caused by friction and impact of coal slag. The variable pitch drill bit integrates the functions of hole opening, sampling chamber sealing, and coal core cutting. The side wall sampling drill bit integrates cutting, core breaking, and anti-detachment structures. The components are simplified, and with the help of various limit slides and guide grooves, precise positioning is achieved. Moving parts are not easy to jam, and the reliability of equipment operation is significantly improved.

[0021] 3. During axial sampling, the variable pitch drill bit can quickly seal the sampling cavity and block the coal core from falling into the channel; the side wall sampling is equipped with an elastic coal core anti-detachment component, which firmly confines the cut coal core inside the drill bit, structurally preventing the coal core from falling off and scattering during the drilling process, ensuring the integrity of the coal sample, and improving the sampling qualification rate and the accuracy of the test data.

[0022] 4. The sidewall sampling drill bit, drive and transmission components are all housed in the internal cavity of the drill pipe body and are not exposed during drilling operations. This can effectively resist the impact and wear of coal seams and rock walls, reduce the probability of component damage, and extend the overall service life of the equipment. The layout of each cavity and chute is reasonable, the structure is compact, the whole machine is small in size, and the downhole drilling passability is good.

[0023] 5. The hydraulic system drives all actuators in a unified manner, and the lever-type mechanical transmission structure ensures smooth power transmission and low transmission loss. The stroke and swing angle of the drill bit extension, retraction, pitch extension and retraction are precisely controllable. The operation is simple, and all sampling actions can be completed through the ground hydraulic control system. The manual intervention is reduced, thus reducing the labor intensity of the operation. Attached Figure Description

[0024] Figure 1 This is a three-dimensional sectional view of a coal mine drilling and sampling device proposed in this invention; Figure 2 This is an exploded view of a coal mine drilling and sampling device proposed in this invention; Figure 3 This is a front view of a coal mine drilling and sampling device proposed in this invention; Figure 4 for Figure 3 A cross-sectional view along section line AA; Figure 5 This is a partial structural schematic diagram of the sidewall drilling and sampling working condition of a coal mine drilling and sampling device proposed in this invention; Figure 6 This is a schematic diagram of the core drill rod of a coal mine drilling and sampling device proposed in this invention; Figure 7 This is a cross-sectional schematic diagram of the bottom drill bit structure of a coal mine drilling and sampling device proposed in this invention; Figure 8 This is a schematic diagram of the structure of a variable-pitch drill bit for a coal mine drilling and sampling device proposed in this invention; Figure 9 This is a partial structural schematic diagram of a miniature hydraulic rod for a coal mine drilling and sampling device proposed in this invention; Figure 10 This is a partial structural schematic diagram of the drill rod body of a coal mine drilling and sampling device proposed in this invention; Figure 11 This is a cross-sectional schematic diagram of the sidewall sampling drill bit of a coal mine drilling and sampling device proposed in this invention; Figure 12 This is a schematic diagram of the cross-section of the cutting blade of a coal mine drilling and sampling device proposed in this invention; Figure 13 for Figure 4 A magnified view of a section at point I.

[0025] Among them, 1. Main drill bit assembly, 11. Core drilling rod, 111. Guide hole, 112. Sampling chamber, 12. Bottom drill bit, 121. Ring groove, 122. Pipe hole, 123. Hydraulic slide, 124. Variable pitch slide, 125. Cutting edge, 13. Variable pitch drill bit, 131. Side wall frame, 14. Miniature hydraulic assembly, 141. Miniature hydraulic rod, 1411. Connecting boss, 142. Hydraulic ring, 143. Ring groove cover plate, 2. Drill rod assembly, 21. Drill rod body, 211. Drill bit groove, 2111. Sliding column guide groove, 2112. Extension plate rotating column, 2113. Control rod slide, 2114. Side rod through groove, 212. Side core storage groove, 213. Material discharge column slide, 214. Hydraulic... 22. Device slot, 23. Hydraulic control system, 34. Feeding column, 35. Side wall sampling drill bit, 36. Cutting head, 37. Cutting knife rotating slot, 38. Cutting knife, 39. Drill bit gear, 30. Anti-detachment slide groove, 31. Coal core anti-detachment component, 32. Anti-detachment spring, 33. Drill bit extension assembly, 44. Drill bit fixing device, 45. Drive cavity, 46. Sliding column, 47. Rotating column, 48. Drive motor, 49. Motor gear, 40. Extension plate, 41. Rotating hole, 42. Long slide groove, 43. Short slide groove, 44. Rotation control rod, 45. Control sub-plate, 46. Side rod, 47. Side rod slide column, 48. Hydraulic control plate, 49. Hydraulic plate control rod, 40. Hydraulic plate spring.

[0026] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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.

[0029] like Figures 1-13As shown, the present invention proposes a coal mine drilling and sampling device, including a main drill bit assembly 1, a drill rod assembly 2, a sidewall sampling drill bit 3, and a drill bit extension assembly 4. The main drill bit assembly 1 is located at the bottom of the drill rod assembly 2, the sidewall sampling drill bit 3 is located on the drill bit extension assembly 4, and the drill bit extension assembly 4 is located inside the drill rod assembly 2. The main drill bit assembly 1 includes a core drill rod 11, a bottom drill bit 12, a variable pitch drill bit 13, and a micro hydraulic assembly 14. The bottom drill bit 12 is fixed to the bottom of the core drill rod 11 by bolts. The variable pitch drill bit 13 is slidably arranged in a circular array on the bottom drill bit 12. The micro hydraulic assembly 14 is located inside the bottom drill bit 12 and controls the sliding adjustment of the variable pitch drill bit 13.

[0030] The core drill rod 11 has a sampling chamber 112 at its center and a guide hole 111 at its edge. The bottom drill bit 12 has an annular groove 121 at its top, which connects to the guide hole 111. The bottom drill bit 12 has a pipe hole 122, a hydraulic slide 123, a pitch variable slide 124, and a cutting edge 125 arranged in annular array. The pitch variable slide 124 is located on the side of the cutting edge 125, and the hydraulic slide 123 is located on the side wall of the pitch variable slide 124. The pipe hole 122 connects the hydraulic slide 123 and the annular groove 121. The pitch variable drill bit 13 is slidably disposed in the pitch variable slide 124. The side wall of the pitch variable drill bit 13 has a side wall frame 131, which is slidably disposed in the hydraulic slide 123.

[0031] The miniature hydraulic assembly 14 includes a miniature hydraulic rod 141, a hydraulic ring pipe 142, and a ring pipe groove cover plate 143. The miniature hydraulic rod 141 is disposed in the hydraulic slide groove 123, the hydraulic ring pipe 142 is disposed in the ring pipe groove 121, and the ring pipe groove cover plate 143 is fastened to the ring pipe groove 121. The front end of the miniature hydraulic rod 141 is provided with a connecting boss 1411, which is snapped into the side wall frame 131. The hydraulic ring pipe 142 is connected to the miniature hydraulic rod 141 through a hydraulic pipe.

[0032] The drill rod assembly 2 includes a drill rod body 21, a hydraulic control system 22, and a feed column 23. The core drill rod 11 is fixed to the bottom of the drill rod body 21 by bolts. The hydraulic control system 22 is located inside the lower side of the drill rod body 21. The hydraulic ring pipe 142 is connected to the hydraulic control system 22 through the guide hole 111 via a hydraulic pipe. The feed column 23 is slidably disposed inside the drill rod body 21.

[0033] The drill rod body 21 has a drill bit groove 211 in the middle, a side core storage groove 212 at the center above the drill bit groove 211, and a material feed column slide 213 at the center below the drill bit groove 211. The bottom of the material feed column slide 213 is connected to the hydraulic control system 22 through a hydraulic pipe. A hydraulic device groove 214 is also provided on the lower side of the drill bit groove 211, and the hydraulic device groove 214 is located on one side of the material feed column slide 213.

[0034] The drill bit groove 211 has symmetrical sliding column guide grooves 2111 on both sides of the center of the two side walls. The drill bit groove 211 has symmetrical extension plate rotating column 2112 and control rod sliding groove 2113 on both sides of the bottom of the drill bit groove 211. The extension plate rotating column 2112 is located at the center of the drill bit groove 211. The drill bit groove 2111 has symmetrical side rod through grooves 2114 on both sides of the bottom of the drill bit groove 211. The side rod through grooves 2114 are connected to the hydraulic device groove 214.

[0035] The sidewall sampling drill bit 3 has a cutting head 31 at its front end, a cutting blade rotating groove 32 at the rear of the cutting head 31, a cutting blade 33 rotating inside the cutting blade rotating groove 32, a drill bit gear 34 on the outer wall of the middle part of the sidewall sampling drill bit 3, and an anti-detachment component groove 35 in a circular array at the rear end of the sidewall sampling drill bit 3. A coal core anti-detachment component 36 is slidably installed inside the anti-detachment component groove 35, and an anti-detachment component spring 361 is installed on the side wall of the coal core anti-detachment component 36. The end of the anti-detachment component spring 361 is located on the inner wall of the anti-detachment component groove 35.

[0036] The drill bit extension assembly 4 includes a drill bit fixing device 41 and a drive motor 42. The drill bit fixing device 41 is located in the drill bit groove 211. The drill bit fixing device 41 has a drive cavity 411 inside. The drill bit fixing device 41 has a sliding column 412 and a rotating column 413 symmetrically arranged at both ends. The sliding column 412 is slidably arranged in the sliding column guide groove 2111. The side wall sampling drill bit 3 is rotatably arranged on the drill bit fixing device 41. The drive motor 42 is arranged in the drive cavity 411. The output shaft of the drive motor 42 is provided with a motor gear 421, which meshes with the drill bit gear 34.

[0037] The drill bit extension assembly 4 also includes an extension plate 43 and a rotation control rod 44. The extension plate 43 has a rotation hole 431 at the bend, a long slide groove 432 on the long arm of the extension plate 43, and a short slide groove 433 on the short arm of the extension plate 43. The rotation hole 431 is rotatably mounted on the extension plate rotation column 2112, and the slide column 412 is also slidably mounted in the long slide groove 432. The rotation control rod 44 is slidably mounted in the control rod slide groove 2113, and the top of the rotation control rod 44 is rotatably mounted on the rotation column 413.

[0038] The drill bit extension assembly 4 also includes a control sub-plate 45 and a hydraulic control plate 46. The control sub-plate 45 is located in the hydraulic device groove 214. Side rods 451 are symmetrically arranged on both sides of the control sub-plate 45. The side rods 451 are slidably arranged in the side rod through groove 2114. The top of the side rod 451 is provided with a side rod slide column 4511, which slides in the short slide groove 433. The hydraulic control plate 46 is located in the hydraulic device groove 214. The bottom of the hydraulic control plate 46 is provided with a hydraulic plate control rod 461. A hydraulic plate spring 462 is provided at the edge of the hydraulic control plate 46. The bottom of the hydraulic plate spring 462 is connected to the control sub-plate 45. The hydraulic plate control rod 461 is connected to the hydraulic control system 22 through a hydraulic pipe.

[0039] In practical use, the ground drilling rig is started, driving the entire device to rotate clockwise at a set speed, while simultaneously controlling the drilling rig to feed downwards at a uniform speed. The cutting edge 125 of the bottom drill bit 12 first contacts the coal seam and breaks the coal body, starting the drilling process. A coring command is issued to the hydraulic control system 22, which outputs high-pressure hydraulic oil. The hydraulic oil is transported through the hydraulic pipe in the guide hole 111 of the coring drill rod 11 to the hydraulic ring pipe 142, and then through the various pipe holes 122 of the bottom drill bit 12, synchronously supplying oil to all the miniature hydraulic rods 141. Multiple sets of miniature hydraulic rods 141 extend forward synchronously, pushing the variable pitch drill bit 13 to slide outwards along the variable pitch slide groove 124 through the front connecting boss 1411, until the variable pitch drill bit moves to the outside of the cutting edge 125, and the previously blocked sampling chamber 112 is completely opened. The drilling rig continues to feed downwards, and the cutting edge 125 cuts to form a complete columnar coal core. Under the drilling pressure, the coal core moves upwards along the sampling chamber 112 and is stored inside the coring drill rod 11, completing continuous axial coring. After a single-stage coring is completed, the hydraulic control system 22 is reversed to release pressure, the hydraulic oil flows back, the micro hydraulic rod 141 retracts, and the variable pitch drill bit 13 is pulled inwards. During the retraction process, the variable pitch drill bit 13 shears the root of the coal core, cutting the coal core from the coal seam matrix, and the coal core remains in the sampling chamber 112. Finally, the variable pitch drill bit 13 resets and seals the sampling chamber 112 again to prevent the coal core from falling out.

[0040] After the borehole reaches the designated depth, initially, the feed column 23 penetrates the sidewall sampling drill bit 3, and the top of the feed column 23 is closed by the side core receiving groove 212. If it is necessary to collect coal seam samples from the borehole sidewall, the rotation and feed functions of the drilling rig are stopped, so that the device remains stationary at the target depth. The hydraulic control system 22 reduces the oil pressure at the bottom of the feed column chute 213, and the feed column 23 slides down along the chute and retracts completely into the feed column chute 213, releasing the lock on the sidewall sampling drill bit 3. The hydraulic control system 22 pulls the hydraulic plate control rod 461 down, causing the hydraulic control plate 46 to move synchronously and compress the hydraulic plate spring 462; the hydraulic plate spring 462 drives the control sub-plate 45 down along the hydraulic device groove 214, and the side rods 451 on both sides of the control sub-plate move down synchronously along the side rod through groove 2114. The side rod sliding column 4511 at the top of the side rod 451 slides in the short sliding groove 433 of the extension plate 43, pushing the extension plate 43 to flip outward with the extension plate rotating column 2112 as the fulcrum; the long sliding groove 432 of the long arm of the extension plate 43 drives the sliding column 412 to move, causing the drill bit fixing device 41 to swing outward as a whole, so that the cutting head 31 of the side wall sampling drill bit 3 is in close contact with the coal seam on the side wall of the borehole.

[0041] The drive motor 42 is started, and the motor drives the sidewall sampling drill bit 3 to rotate at high speed through gear meshing. The cutting head 31 performs annular cutting on the sidewall coal seam, and the columnar coal core gradually enters the internal cavity of the drill bit. When the motor rotates forward, the cutting blade 33 is drawn into the cutting blade rotation groove 32 by the resistance of the coal body, without obstructing the entry of the coal core. When the length of the coal core reaches the sampling requirement, the motor is controlled to rotate in reverse. The coal seam wall blocks the rotation of the cutting blade 33, and the cutting blade opens outward, on the one hand expanding the sampling aperture, and on the other hand cutting off the root of the sidewall coal core, so that the coal core is separated from the parent body. After the coal core is cut off, it slides into the inside of the drill bit. The coal core anti-detachment component 36 blocks the coal core to prevent it from falling off, and the sidewall sampling process is completed. After the sidewall sampling is completed, the drive motor 42 is turned off, and the hydraulic control system 22 supplies high-pressure oil to the hydraulic plate control rod 461, pushing the hydraulic control plate 46 upward. The hydraulic plate spring 462 rebounds, driving the control sub-plate 45 and the side rod 451 to reset. The side rod slide column 4511 pushes the extension plate 43 to rotate in the opposite direction, and the side wall sampling drill bit 3 retracts into the drill bit slot 211 along with the drill bit fixing device 41. Then, the control system restores the hydraulic pressure of the feed column slide 213, the feed column 23 extends upward, and the feed column 23 re-inserts into the side wall sampling drill bit 3. At the same time, the feed column 23 pushes the coal core in the side wall sampling drill bit 3 into the side core receiving slot 212 and forms a seal. After the internal mechanism is completely reset and there is no jamming, the drilling rig is started, and the entire device is lifted to the ground at a uniform speed.

[0042] Disassemble the drill rod assembly and the main drill bit assembly, and take out the axial coal core from the sampling chamber 112 of the core drill rod 11 and the side wall coal core from the side core receiving groove 212. Clean the coal slag and dust inside the device, check the wear of the parts, and the single sampling operation is completed.

[0043] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

[0045] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A coal mine drilling and sampling device, characterized in that: It includes a main drill bit assembly (1), a drill rod assembly (2), a sidewall sampling drill bit (3), and a drill bit extension assembly (4). The main drill bit assembly (1) is located at the bottom of the drill rod assembly (2), the sidewall sampling drill bit (3) is located on the drill bit extension assembly (4), and the drill bit extension assembly (4) is located inside the drill rod assembly (2). The main drill bit assembly (1) includes a core drill rod (11), a bottom drill bit (12), a variable pitch drill bit (13), and a micro hydraulic assembly (14). The bottom drill bit (12) is fixed to the bottom of the core drill rod (11) by bolts. The variable pitch drill bit (13) is slidably arranged in a circular array on the bottom drill bit (12). The micro hydraulic assembly (14) is located inside the bottom drill bit (12) and controls the sliding adjustment of the variable pitch drill bit (13).

2. The coal mine drilling and sampling device according to claim 1, characterized in that: The core drill rod (11) has a sampling cavity (112) at its center, and a guide hole (111) is provided at the edge of the core drill rod (11). The bottom drill bit (12) has an annular groove (121) at its top, which connects to the guide hole (111). The bottom drill bit (12) has a pipe hole (122), a hydraulic slide (123), a variable pitch slide (124), and a cutting edge (125) arranged in annular array. The groove (124) is provided on the side of the cutting edge (125), the hydraulic slide groove (123) is provided on the side wall of the variable pitch slide groove (124), the pipe hole (122) connects the hydraulic slide groove (123) and the annular groove (121), the variable pitch drill bit (13) is slidably provided in the variable pitch slide groove (124), the side wall of the variable pitch drill bit (13) is provided with a side wall frame (131), and the side wall frame (131) is slidably provided in the hydraulic slide groove (123).

3. The coal mine drilling and sampling device according to claim 2, characterized in that: The micro hydraulic assembly (14) includes a micro hydraulic rod (141), a hydraulic ring pipe (142), and a ring pipe groove cover plate (143). The micro hydraulic rod (141) is located in the hydraulic slide groove (123), the hydraulic ring pipe (142) is located in the ring pipe groove (121), and the ring pipe groove cover plate (143) is fastened to the ring pipe groove (121). The front end of the micro hydraulic rod (141) is provided with a connecting boss (1411), which is snapped into the side wall frame (131). The hydraulic ring pipe (142) and the micro hydraulic rod (141) are connected by a hydraulic pipe.

4. A coal mine drilling and sampling device according to claim 3, characterized in that: The drill rod assembly (2) includes a drill rod body (21), a hydraulic control system (22), and a feed column (23). The core drill rod (11) is fixed to the bottom of the drill rod body (21) by bolts. The hydraulic control system (22) is located inside the lower side of the drill rod body (21). The hydraulic ring pipe (142) is connected to the hydraulic control system (22) through a hydraulic pipe passing through a guide hole (111). The feed column (23) is slidably located inside the drill rod body (21).

5. A coal mine drilling and sampling device according to claim 4, characterized in that: The drill rod body (21) has a drill bit groove (211) in the middle, a side core storage groove (212) is provided at the center above the drill bit groove (211), a material feed column slide groove (213) is provided at the center below the drill bit groove (211), the bottom of the material feed column slide groove (213) is connected to the hydraulic control system (22) through a hydraulic pipe, and a hydraulic device groove (214) is also provided on the lower side of the drill bit groove (211), the hydraulic device groove (214) is located on one side of the material feed column slide groove (213).

6. A coal mine drilling and sampling device according to claim 5, characterized in that: The drill bit groove (211) has symmetrical sliding column guide grooves (2111) on both sides of the center. The bottom of the drill bit groove (211) has symmetrical extension plate rotating column (2112) and control rod sliding groove (2113). The extension plate rotating column (2112) is located at the center of the drill bit groove (211). The bottom of the drill bit groove (211) has symmetrical side rod through grooves (2114) on both sides. The side rod through grooves (2114) are connected to the hydraulic device groove (214).

7. A coal mine drilling and sampling device according to claim 6, characterized in that: The side wall sampling drill bit (3) has a cutting head (31) at its front end, a cutting blade rotating groove (32) at the rear of the cutting head (31), a cutting blade (33) rotating inside the cutting blade rotating groove (32), a drill bit gear (34) at the middle outer wall of the side wall sampling drill bit (3), and an anti-detachment component slide groove (35) in a circular array at the rear end of the side wall sampling drill bit (3). A coal core anti-detachment component (36) is slidably installed inside the anti-detachment component slide groove (35), and an anti-detachment component spring (361) is installed on the side wall of the coal core anti-detachment component (36). The end of the anti-detachment component spring (361) is located on the inner wall of the anti-detachment component slide groove (35).

8. A coal mine drilling and sampling device according to claim 7, characterized in that: The drill bit extension assembly (4) includes a drill bit fixing device (41) and a drive motor (42). The drill bit fixing device (41) is located in the drill bit groove (211). The drill bit fixing device (41) has a drive cavity (411) inside. The drill bit fixing device (41) has a sliding column (412) and a rotating column (413) symmetrically arranged at both ends. The sliding column (412) is slidably arranged in the sliding column guide groove (2111). The side wall sampling drill bit (3) is rotatably arranged on the drill bit fixing device (41). The drive motor (42) is arranged in the drive cavity (411). The output shaft of the drive motor (42) is provided with a motor gear (421). The motor gear (421) is meshed with the drill bit gear (34).

9. A coal mine drilling and sampling device according to claim 8, characterized in that: The drill bit extension assembly (4) further includes an extension plate (43) and a rotation control rod (44). The extension plate (43) has a rotation hole (431) at the bend. The extension plate (43) has a long slide groove (432) on its long arm and a short slide groove (433) on its short arm. The rotation hole (431) is rotatably mounted on the extension plate rotation column (2112). The slide column (412) is also slidably mounted in the long slide groove (432). The rotation control rod (44) is slidably mounted in the control rod slide groove (2113). The top of the rotation control rod (44) is rotatably mounted on the rotation column (413).

10. A coal mine drilling and sampling device according to claim 9, characterized in that: The drill bit extension assembly (4) also includes a control sub-plate (45) and a hydraulic control plate (46). The control sub-plate (45) is located in the hydraulic device groove (214). Side rods (451) are symmetrically arranged on both sides of the control sub-plate (45). The side rods (451) are slidably arranged in the side rod through groove (2114). The top of the side rods (451) is provided with a side rod slide column (4511). The side rod slide column (4511) slides in the short slide groove (433). The hydraulic control plate (46) is located in the hydraulic device groove (214). The bottom of the hydraulic control plate (46) is provided with a hydraulic plate control rod (461). A hydraulic plate spring (462) is provided at the edge of the hydraulic control plate (46). The bottom of the hydraulic plate spring (462) is connected to the control sub-plate (45). The hydraulic plate control rod (461) is connected to the hydraulic control system (22) through a hydraulic pipe.

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