Novel closed coring device

Abstract

The utility model relates to the technical field of coal mine drilling coring, in particular to a novel closed coring device. Comprising an outer barrel, a drill bit and a drilling tool connector, the drill bit is located at one end of the outer barrel, the drilling tool connector is located at the other end of the outer barrel, a spear mechanism is installed at the end, away from the drill bit, of the outer barrel, a hanging mechanism is installed in the outer barrel and located at one end of the spear mechanism, and a ball seat is arranged in the outer barrel and located on one side of the hanging mechanism; an inner cylinder is arranged in the outer cylinder and located on one side of the ball seat. According to the novel closed coring device, rope coring is achieved through cooperation of the outer barrel, the drill bit, the spear mechanism, the suspension mechanism, the ball seat and the closed ball valve, after closed coring of a broken soft coal core is completed, other parts except for the outer barrel, the drill bit and a drilling tool connector are directly taken out through the male fishing head, time cost is saved, and working efficiency is improved. And meanwhile, when the coring device is used, core clamping can be effectively avoided, and the sealing reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine drilling coring, in particular to a novel closed coring device. Background Art

[0002] Closed sampling technology is a ground sampling technology that can also be used underground. It can realize non-destructive sampling of coal resources and avoid the damage to coal seams caused by traditional sampling methods. Secondly, closed sampling technology can provide guarantees for accurate measurement of gas content and prevent gas outburst disasters. At the same time, when coring coal seams, it can be divided into broken soft coal cores and hard coal cores.

[0003] The patent document with the announcement number (CN220226782U) discloses a drilling-type pressure-maintaining coring tool, which includes an outer cylinder assembly and an inner cylinder string assembly arranged inside the outer cylinder assembly. The outer cylinder assembly is provided with a top joint, an outer cylinder and a drill bit that are threadedly connected in sequence from top to bottom, and the inner cylinder string assembly is provided with a hydraulic lifting mechanism, a connecting mechanism and a sealing mechanism from top to bottom; the hydraulic lifting mechanism is provided with a ball seat joint and an upward sleeve, the upper end of the ball seat joint is threaded and connected to the lower end of the top joint, the upward sleeve can be fixedly slidably installed on the outer surface of the ball seat joint, and the ball seat joint is provided with a lifting device for lifting the upward sleeve; a ball valve sealing mechanism is provided in the sealing mechanism, and when the ball valve sealing mechanism is lifted, the sealing mechanism and the external space can be adjusted from a connected state to a closed state. The utility model discloses a drilling-type pressure-maintaining coring tool that realizes liquid flow channel conversion by throwing a ball to hold pressure and shear the ball seat, and realizes the upward movement of the inner cylinder string by hydraulic force to close the ball valve, and the structure is stable and reliable;

[0004] When using the above technology, it was found that the following technical problems exist in the existing technology: downhole coring technology has been mature, but closed coring in ground wells is rarely used. Most of them use the drilling tool raising and lowering method, which is inefficient. Therefore, a new closed coring device is designed to provide another technical solution to the above technical problems. Utility Model Content

[0005] Based on this, it is necessary to provide a new type of closed coring device to address the above technical problems, which is used to solve the technical problems that downhole coring technology is mature, but closed coring in ground wells is rarely used, and most of them use the drilling tool raising and lowering method, which is inefficient.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A novel closed coring device comprises an outer tube, a drill bit and a drill tool joint, the drill bit being located at one end of the outer tube, the drill tool joint being located at the other end of the outer tube, a spear scooping mechanism being installed at the end of the outer tube away from the drill bit, a suspension mechanism being installed inside the outer tube and at one end of the spear scooping mechanism, a ball seat being provided inside the outer tube and at one side of the suspension mechanism, an inner tube being provided inside the outer tube and at one side of the ball seat, a desorption valve being fixed inside the inner tube near one end of the ball seat, a push tube being provided inside the outer tube and at the outside of the inner tube, and a valve assembly being installed inside the outer tube and at one end of the inner tube.

[0008] As a preferred embodiment of the novel closed coring device provided by the utility model, the spear scooping mechanism includes a spring-loaded stopper, a steel ball, a spear scooping seat, a spring and a spring seat, one end of the outer cylinder is threadedly connected to the drill tool joint, the inside of the drill tool joint is slidably connected with the spring-loaded stopper, the groove inside the spring-loaded stopper clamps the steel ball, the steel ball and the drill tool joint are clamped through the corresponding groove, the inner side of the spring-loaded stopper is slidably connected with the spear scooping seat, the inner side of the spring-loaded stopper and one end of the spear scooping seat is sleeved with a spring, the inner side of the spear scooping seat is threadedly connected with the spring seat, and the spring seat is slidably connected to the spring-loaded stopper.

[0009] As a preferred embodiment of the novel closed coring device provided by the utility model, the suspension mechanism includes a suspension sleeve, a suspension shaft, a thrust ball bearing, a deep groove ball bearing, a suspension joint and a first connecting pin, a suspension shaft is provided inside the suspension sleeve near the spear seat, the outer side of the suspension shaft is threadedly connected to the spring seat, the end of the outer side of the suspension shaft near the spring seat is rotatably connected to the suspension sleeve through the thrust ball bearing, the end of the outer side of the suspension shaft away from the spring seat is rotatably connected to the suspension sleeve through deep groove ball bearings, a suspension joint is fixed inside the suspension sleeve and at one end of the suspension shaft, and a first connecting pin is transitionally fitted inside the top and bottom ends of the suspension sleeve and at the position corresponding to the suspension joint.

[0010] As a preferred embodiment of the new type of closed coring device provided by the utility model, a pressure holding hole is provided inside the suspension joint, and drainage holes are provided at the top and bottom of the suspension sleeve away from one end of the suspension shaft. A second connecting pin is provided inside the suspension sleeve and at the internal transition fit at the end of the drainage hole away from the drill bit.

[0011] As a preferred embodiment of the novel closed coring device provided by the present invention, positioning holes are provided at the top and bottom ends of the push cylinder near one end of the drill bit joint, and the interior of the positioning hole is transitionally matched with the second connecting pin.

[0012] As a preferred embodiment of the new closed coring device provided by the present invention, a first diversion groove is provided inside the ball seat near one end of the drill bit joint, and a second diversion groove is provided inside the ball seat and at the top and bottom of the first diversion groove away from the drill bit joint.

[0013] As a preferred embodiment of the new type of closed coring device provided by the utility model, the valve assembly includes a closed ball valve, a lower valve body and a retaining spring. The lower valve body is fixed inside the outer cylinder and at the end of the drill bit close to the drill bit joint. The lower valve body is fixed to the inner cylinder, and the interior of the lower valve body is rotatably connected to the closed ball valve. A movable hole is opened inside the closed ball valve, and a retaining spring is fixed inside the end of the lower valve body away from the drill bit.

[0014] As a preferred embodiment of the new type of closed coring device provided by the utility model, a limiting mechanism is installed at one end of the inner cylinder close to the closed ball valve, and the limiting mechanism includes a blocking plate, a rotating column, a limiting plate, a support plate and a torsion spring. Four blocking plates are evenly distributed on the inner side of the inner cylinder, and the internal rotation of one end of the blocking plate is connected to the rotating column. The top and bottom of the rotating column are fixed with support plates, and the support plate is fixed to the inner cylinder. A torsion spring is fixed between the blocking plate and the support plate and on the outside of the rotating column. The limiting plate is fixed on the outside of the rotating column, and the limiting plate is slidably connected to the blocking plate.

[0015] As a preferred embodiment of the novel closed coring device provided by the present invention, a limiting groove is provided on the inner side of the blocking plate and at a position corresponding to the limiting plate, and the limiting groove is slidably connected to the limiting plate.

[0016] As a preferred embodiment of the new type of closed coring device provided by the utility model, a pushing mechanism is installed in the inner cylinder near one end of the closed ball valve and between two adjacent blocking plates, and the pushing mechanism includes a threaded rod, a fixed shell, a telescopic shell, a telescopic plate, a positioning plate and a driving motor. The fixed shell is fixed to the inner cylinder, and the fixed shell is slidingly connected to the telescopic shell in the inner part near one end of the closed ball valve, and the telescopic shell is slidingly connected to the telescopic plate in the inner part near one end of the closed ball valve. The fixed shell is fixed with a driving motor in the inner part away from the closed ball valve, and the output end of the driving motor is located in the interior of the fixed shell and is connected with a threaded rod, and the threaded rod is threadedly connected to the telescopic plate on the outer side near one end of the closed ball valve, and positioning plates are fixed on both sides of the inner part of the telescopic shell away from the closed ball valve.

[0017] It can be seen without a doubt that the above-mentioned technical solution of this application can definitely solve the technical problem to be solved by this application.

[0018] At the same time, through the above technical solutions, the present invention has at least the following beneficial effects:

[0019] The utility model provides a novel closed coring device, which realizes rope coring through the cooperation of an outer cylinder, a drill bit, a spear fishing mechanism, a suspension mechanism, a ball seat and a closed ball valve. After the coring of the crushed soft coal core is completed, the remaining components except the outer cylinder, the drill bit and the drill tool joint are directly fished out using the rope, saving time and cost and improving efficiency.

[0020] Through the cooperation of the blocking plate, the limiting plate and the torsion spring, the crushed soft coal core entering the inner tube can be guided by the rotation of the blocking plate. At the same time, when the crushed soft coal core falls due to gravity, the cooperation of the limiting plate and the limiting groove limits the rotation of the blocking plate towards the direction of the closed ball valve, thereby preventing the crushed soft coal core inside the inner tube from falling due to gravity.

[0021] Through the cooperation of the threaded rod, the telescopic shell and the telescopic plate, when there are residual soft coal cores inside the closed ball valve, the rotation of the threaded rod can drive the telescopic plate to extend out of the telescopic shell, thereby pushing out the residual soft coal cores inside the closed ball valve, and the telescopic plate can be retracted inside the telescopic shell without affecting the rotation and closing of the closed ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 It is a cross-sectional view of the utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the closed ball valve of the utility model when it is opened;

[0026] Figure 4 This is a schematic diagram of the closed structure of the utility model closed ball valve;

[0027] Figure 5 This is a structural diagram of the spear-fishing mechanism of the utility model;

[0028] Figure 6 This is a schematic structural diagram of the suspension mechanism of the present utility model;

[0029] Figure 7 This is a schematic structural diagram of the ball seat of the utility model;

[0030] Figure 8 This is a schematic diagram of the structure of the push cylinder of the utility model;

[0031] Figure 9 This is a schematic structural diagram of the utility model closed ball valve;

[0032] Figure 10 This is a schematic structural diagram of the blocking plate of the utility model;

[0033] Figure 11 This is a schematic diagram of the telescopic plate of the utility model when it is not working;

[0034] Figure 12 This is a structural diagram of the support plate of the utility model;

[0035] Figure 13 This is a schematic structural diagram of the limit plate of the utility model;

[0036] Figure 14 This is a schematic structural diagram of the limit slot of the utility model;

[0037] Figure 15 This is a schematic diagram of the internal structure of the fixed shell of the utility model.

[0038] Figure: 1. Outer cylinder; 2. Drill bit; 3. Drill tool joint; 4. Spear fishing mechanism; 5. Suspension mechanism; 6. Ball seat; 7. Desorption valve; 8. Push cylinder; 9. Inner cylinder; 10. Sealed ball valve; 11. Positioning hole; 12. Spring stopper; 13. Steel ball; 14. Spear fishing seat; 15. Spring; 16. Spring seat; 17. Suspension sleeve; 18. Suspension shaft; 19. Thrust ball bearing; 20. Deep groove ball bearing; 21. Suspension joint. 22. First connecting pin; 23. First diverter groove; 24. Second diverter groove; 25. Lower valve body; 26. Retaining spring; 27. Threaded rod; 28. Blocking plate; 29. ​​Rotating column; 30. Limiting plate; 31. Support plate; 32. Torsion spring; 33. Limiting groove; 34. Fixed shell; 35. Telescopic shell; 36. Telescopic plate; 37. Positioning plate; 38. Drive motor; 39. Pressure holding hole; 40. Drain hole; 41. Second connecting pin. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein can be combined with each other.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0043] Example 1

[0044] Reference Figures 1-9 A novel closed coring device includes an outer cylinder 1, a drill bit 2 and a drill joint 3. The drill bit 2 is located at one end of the outer cylinder 1, and the drill joint 3 is located at the other end of the outer cylinder 1. The drilling pressure and torque are transmitted by the rotation of the drill joint 3, so that the drill bit 2 rotates to perform drilling. A spear fishing mechanism 4 is installed at the end of the outer cylinder 1 away from the drill bit 2. A hanging mechanism 5 is installed inside the outer cylinder 1 and at one end of the spear fishing mechanism 4. A ball seat 6 is provided inside the outer cylinder 1 and at one side of the hanging mechanism 5. An inner cylinder 9 is provided inside the outer cylinder 1 and at one side of the ball seat 6. A desorption valve 7 is fixed inside the inner cylinder 9 near the end of the ball seat 6, so that gas desorption is achieved through the desorption valve 7.

[0045] A push cylinder 8 is provided inside the outer cylinder 1 and outside the inner cylinder 9, and there are gaps between the push cylinder 8 and the inner cylinder 9 and between the push cylinder 8 and the outer cylinder 1. A valve assembly is installed inside the outer cylinder 1 and at one end of the inner cylinder 9, so that the crushed soft coal core when the drill bit 2 is working can pass through the valve assembly and enter the interior of the inner cylinder 9;

[0046] The spear fishing mechanism 4 includes a spring-loaded stopper 12, a steel ball 13, a spear fishing seat 14, a spring 15 and a spring seat 16. One end of the outer cylinder 1 is threadedly connected to the drill joint 3. The inner part of the drill joint 3 is slidably connected with the spring-loaded stopper 12. The groove inside the spring-loaded stopper 12 is clamped with the steel ball 13. The steel ball 13 is clamped with the drill joint 3 through the corresponding groove. At the same time, the steel ball 13 is slidably connected with the groove inside the spear fishing seat 14. The positioning relationship between the outer cylinder 1 and the inner cylinder 9 is established or released through the steel ball 13. A certain limit is formed between the spring-loaded stopper 12 and the drill joint 3, and a spear seat 14 is slidably connected to the inner side of the spring-loaded stopper 12, and the spear seat 14 is located between the two steel balls 13. A spring 15 is sleeved on the inner side of the spring-loaded stopper 12 and on one end of the spear seat 14. The inner side of the spear seat 14 is threadedly connected to a spring seat 16. The spring seat 16 is slidably connected to the spring-loaded stopper 12, so that the movement of the spring seat 16 can drive the spring 15 to compress or reset by the rebound of the spring 15 after compression;

[0047] The suspension mechanism 5 includes a suspension sleeve 17, a suspension shaft 18, a thrust ball bearing 19, a deep groove ball bearing 20, a suspension joint 21 and a first connecting pin 22. A suspension shaft 18 is provided inside the suspension sleeve 17 near the spear seat 14. The outer side of the suspension shaft 18 is threadedly connected to the spring seat 16. One end of the outer side of the suspension shaft 18 near the spring seat 16 is rotatably connected to the suspension sleeve 17 through the thrust ball bearing 19, and the suspension shaft 18 is only rotatable and cannot be moved between the thrust ball bearing 19 and the suspension sleeve 17. The end of the outer side of the suspension shaft 18 away from the spring seat 16 is rotatably connected to the suspension sleeve 17 through the deep groove ball bearings 20, so that the suspension shaft 18 and the suspension sleeve 17 can rotate in one direction. A suspension joint 21 is fixed inside the suspension sleeve 17 and at one end of the suspension shaft 18, so that the position of the deep groove ball bearing 20 is limited by the suspension joint 21. The first connecting pin 22 is transitionally matched with the position corresponding to the suspension joint 21 inside the top and bottom ends of the suspension sleeve 17.

[0048] A pressure-holding hole 39 is provided inside the suspension joint 21, so that water can flow through the pressure-holding hole 39 after relative displacement occurs between the push cylinder 8 and the suspension sleeve 17. Drain holes 40 are provided at the top and bottom of the suspension sleeve 17 away from the suspension shaft 18, so that water flowing through the pressure-holding hole 39 can enter the interior of the drill bit 2 through the drain holes 40 revealed after the push cylinder 8 moves. A second connecting pin 41 is provided inside the suspension sleeve 17 and at the internal transition of the end away from the drill bit 2 through the drain hole 40.

[0049] In this embodiment, there are two first connecting pins 22, which are symmetrically arranged. For details, please refer to Figure 6 Position, and the number of the second connecting pins 41 is two, which are symmetrically arranged. For details, please refer to Figure 6 Location.

[0050] A first diversion groove 23 is formed inside the ball seat 6 at one end near the drill joint 3, so that water entering through the drill joint 3 can enter the first diversion groove 23 on the ball seat 6, and the first diversion groove 23 can be closed by an external pressure-holding ball. Second diversion grooves 24 are formed inside the ball seat 6 and at the top and bottom of the end of the first diversion groove 23 away from the drill joint 3, so that the water in the first diversion groove 23 is discharged through the second diversion groove 24.

[0051] Positioning holes 11 are provided at the top and bottom ends of the push tube 8 near the drill joint 3. The interior of the positioning hole 11 is transitionally matched with the second connecting pin 41, so that the push tube 8 and the hanging sleeve 17 can be connected and positioned by the cooperation between the second connecting pin 41 and the positioning hole 11;

[0052] The valve assembly includes a closed ball valve 10, a lower valve body 25 and a retaining spring 26. The lower valve body 25 is fixed inside the outer tube 1 and at one end of the drill bit 2 close to the drill tool joint 3. The lower valve body 25 is fixed to the inner tube 9, so that the sample after the drill bit 2 takes the core can pass through the lower valve body 25 into the internal storage of the inner tube 9. The internal rotation of the lower valve body 25 is connected with the closed ball valve 10. A movable hole is opened inside the closed ball valve 10, so that when the movable hole inside the closed ball valve 10 is parallel to the axis of the inner tube 9, the core taken by the drill bit 2 can enter the interior of the inner tube 9 through the closed ball valve 10. When the axis of the movable hole inside the closed ball valve 10 is perpendicular to the axis of the inner tube 9, the sample taken by the drill bit 2 cannot move through the closed ball valve 10. A retaining spring 26 is fixed inside the lower valve body 25 away from the end of the drill bit 2, thereby increasing the acquisition rate of the broken soft coal core through the retaining spring 26.

[0053] The use process of a new type of closed coring device provided by the utility model is as follows: in the initial state, the desorption valve 7 and the closed valve are both in the open state. When in use, the torque is transmitted to the drill bit 2 through the drill joint 3 and coring drilling is achieved under the action of water pressure. Before throwing the ball, the water flows into the interior of the suspension shaft 18 through the interior of the spear mechanism 4, and then enters the interior of the suspension joint 21 through the interior of the suspension shaft 18. At this time, the push tube 8 and the suspension sleeve 17 are connected by the second connecting pin 41, so that the push tube 8 can close the drain hole 40, so that the water flows through the first diversion groove 23 into the interior of the second diversion groove 24, and then the water flows through the second diversion groove 24 into between the push tube 8 and the outer tube 1, and then the water flows into the interior of the drill bit 2, assisting the work of the drill bit 2, so that the broken soft coal core is drilled along the When the drill bit 2 enters the interior of the inner tube 9 through the sealed ball valve 10 and the crushed soft coal core enters the interior of the inner tube 9, the excess air is squeezed out through the desorption valve 7. After the interior of the inner tube 9 is loaded with an appropriate amount of crushed soft coal core, or when the interior of the inner tube 9 is filled with crushed soft coal core, a pressure-holding ball is dropped from the wellhead and falls on the ball seat 6, blocking the first diversion groove 23, thereby allowing the water to flow through the pressure-holding hole 39 on the suspension joint 21 into the annular pressure-holding cavity formed by the suspension joint 21, the suspension sleeve 17 and the push tube 8. As the pressure in the annular pressure-holding cavity continues to increase, the pressure drives the movement of the push tube 8 to shear the second connecting pin 41, so that the push tube 8 moves, closes the desorption valve 7 and the sealed ball valve 10, and allows the water in the annular pressure-holding cavity to flow out through the drain hole 40, thereby completing the closed coring work;

[0054] After the coring work is completed, the male spear head is dropped from the wellhead to hook the groove of the spear seat 14. During salvage, the male spear head is lifted to allow the spear to drive the spring seat 16 and compress the spring 15, resulting in an upward displacement. After the spring 15 is compressed to a certain amount, the bottom groove of the spear seat 14 coincides with the steel ball 13, allowing the steel ball 13 to be released, the connection between the spring stop head 12 and the ball seat is released, the function of the steel ball 13 is disabled, and the inner tube can be salvaged.

[0055] Example 2

[0056] Reference Figure 10-15 , a new type of closed coring device, a limiting mechanism is installed at one end of the inner cylinder 9 near the closed ball valve 10, so that the broken soft coal core entering the inner cylinder 9 will not enter the inner side of the closed ball valve 10 due to the drop of gravity through the work of the limiting mechanism, thereby hindering the rotation of the closed ball valve 10 to achieve closing, and the limiting mechanism includes a blocking plate 28, a rotating column 29, a limiting plate 30, a supporting plate 31 and a torsion spring 32. Four blocking plates 28 are evenly distributed on the inner side of the inner cylinder 9, and the four blocking plates 28 do not contact each other, so that the adjacent blocking plates 28 can rotate without interfering with each other, and the internal rotation of one end of the blocking plate 28 is connected to the rotating column 29, and the top and bottom of the rotating column 29 are fixed with support plates 31, and the support plate 31 is fixed to the inner cylinder 9, so that the position of the blocking plate 28 is limited by the support plate 31 to the position of the rotating column 29;

[0057] The torsion spring 32 is fixed between the blocking plate 28 and the support plate 31 and on the outside of the rotating column 29, so that the rotation of the blocking plate 28 on the outside of the rotating column 29 drives the torsion spring 32 to store force, and after the external force disappears, the blocking plate 28 is reset by the restored force of the torsion spring 32, so that the blocking plate 28 can be rotated in the direction away from the drill bit 2. A limit plate 30 is fixed on the outside of the rotating column 29, and the limit plate 30 is slidably connected to the blocking plate 28, so that the rotation of the blocking plate 28 on the outside of the rotating column 29 is limited by the limit plate 30. A limit groove 33 is provided on the inner side of the blocking plate 28 and at a position corresponding to the limit plate 30. The limit groove 33 is slidably connected to the limit plate 30, and then the rotation stroke of the blocking plate 28 on the outside of the limit plate 30 is limited to 90 degrees through the limit groove 33.

[0058] A pushing mechanism is installed inside the inner tube 9 near one end of the airtight ball valve 10 and between two adjacent blocking plates 28, so that before the airtight ball valve 10 is closed, the crushed soft coal core remaining inside is pushed out by the pushing mechanism, thereby preventing the larger crushed soft coal core remaining inside the airtight ball valve 10 from affecting the rotation and closure of the airtight ball valve 10. The pushing mechanism includes a threaded rod 27, a fixed shell 34, a telescopic shell 35, a telescopic plate 36, a positioning plate 37 and a drive motor 38. The fixed shell 34 is fixed to the inner tube 9. The interior of the fixed shell 34 near one end of the airtight ball valve 10 is slidably connected to the telescopic shell 35. The interior of the telescopic shell 35 near one end of the airtight ball valve 10 is slidably connected to the telescopic plate 36, so that the extension of the telescopic plate 36 pushes out the crushed soft coal core inside the airtight ball valve 10.

[0059] A drive motor 38 is fixed inside the fixed shell 34 at one end away from the sealed ball valve 10, and a threaded rod 27 is connected to the output end of the drive motor 38 and located inside the fixed shell 34, so that water inside the inner cylinder 9 will not enter the outside of the drive motor 38. The threaded rod 27 is threadedly connected to the outside of the telescopic plate 36 close to the end of the sealed ball valve 10, so that the rotation of the positioning plate 37 drives the telescopic plate 36 to move telescopically. Positioning plates 37 are fixed on both sides of the inside of the telescopic shell 35 away from the end of the sealed ball valve 10, so that after the telescopic plate 36 contacts the positioning plate 37, the movement of the telescopic plate 36 drives the telescopic shell 35 to move through the positioning plate 37.

[0060] In this embodiment, the structure of the second embodiment is only used for coring of crushed soft coal cores.

[0061] In this embodiment, a battery is further fixed inside the fixed shell 34 , and the battery is electrically connected to the drive motor 38 via a wire, so that the battery can provide power to the fixed shell 34 .

[0062] In other embodiments, when it is necessary to coring hard coal dust, a storage groove is opened on the inner side of the inner tube 9, and a pushing member is installed inside the storage groove. The pushing member can be a push rod motor, a hydraulic cylinder, a cylinder or the like to push the telescopic structure. The push rod of the pushing member is fixed to the fixed shell 34, so that the fixed shell 34 is driven by the work of the pushing member to drive the pushing mechanism to move, so that when the pushing mechanism moves to the working position, the telescopic plate 36 on the fixed shell 34 can enter the inner side of the closed ball valve 10 after being extended. When the pushing member drives the pushing mechanism to be retracted, the fixed shell 34 and the telescopic plate 36 are staggered with the inner side of the closed ball valve 10, allowing the fixed shell 34 to enter the storage groove inside the inner tube 9, thereby not affecting the coring of hard coal dust.

[0063] The use process of a novel closed coring device provided by the present invention is as follows: when in use, the crushed soft coal core entering through the closed ball valve 10 is allowed to enter the inner side of the inner tube 9. At this time, the crushed soft coal core squeezed into the inner side of the inner tube 9 exerts an extrusion force on the blocking plate 28, so that the blocking plate 28 rotates on the outer side of the rotating column 29 after being subjected to the extrusion force. At the same time, the rotation angle of the blocking plate 28 is limited by the cooperation of the limiting plate 30 and the limiting groove 33. At the same time, the rotation of the blocking plate 28 drives the torsion spring 32 to store force, so that the crushed soft coal core enters the inner side of the inner tube 9 at the end of the blocking plate 28 close to the desorption valve 7. After that, if the crushed soft coal core falls by gravity, it will be restricted from falling by the four blocking plates 28. At the same time, when the closed ball valve 10 needs to be closed by rotation, the threaded rod 27 can be driven by the driving motor 38 to rotate, so that the rotation of the threaded rod 27 drives the telescopic plate 36 located inside the telescopic shell 35 to extend and move, so that the telescopic plate 36 enters the inner side of the closed ball valve 10 to push out the remaining crushed soft coal core. Then, when the reverse rotation of the threaded rod 27 causes the telescopic plate 36 to retract into the interior of the telescopic shell 35, it does not affect the rotation of the closed ball valve 10 to achieve closing.

[0064] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A novel closed coring device, comprising an outer cylinder (1), a drill bit (2) and a drill joint (3), wherein the drill bit (2) is located at one end of the outer cylinder (1) and the drill joint (3) is located at the other end of the outer cylinder (1), characterized in that: A spear scooping mechanism (4) is installed at one end of the outer cylinder (1) away from the drill bit (2); a suspension mechanism (5) is installed inside the outer cylinder (1) and at one end of the spear scooping mechanism (4); a ball seat (6) is provided inside the outer cylinder (1) and at one side of the suspension mechanism (5); an inner cylinder (9) is provided inside the outer cylinder (1) and at one side of the ball seat (6); a desorption valve (7) is fixed inside the inner cylinder (9) near one end of the ball seat (6); a push cylinder (8) is provided inside the outer cylinder (1) and at the outside of the inner cylinder (9); and a valve assembly is installed inside the outer cylinder (1) and at one end of the inner cylinder (9).

2. A novel closed coring device according to claim 1, characterized in that: The spear catching mechanism (4) comprises a spring-loaded stopper (12), a steel ball (13), a spear catching seat (14), a spring (15) and a spring seat (16); one end of the outer cylinder (1) is threadedly connected to the drill joint (3); the inside of the drill joint (3) is slidably connected with the spring-loaded stopper (12); the groove inside the spring-loaded stopper (12) is engaged with the steel ball (13); the steel ball (13) is engaged with the drill joint (3) through the corresponding groove; the inner side of the spring-loaded stopper (12) is slidably connected with the spear catching seat (14); the inner side of the spring-loaded stopper (12) and one end located on the spear catching seat (14) is sleeved with a spring (15); the inner side of the spear catching seat (14) is threadedly connected with the spring seat (16); the spring seat (16) is slidably connected to the spring-loaded stopper (12).

3. A novel closed coring device according to claim 2, characterized in that: The suspension mechanism (5) comprises a suspension sleeve (17), a suspension shaft (18), a thrust ball bearing (19), a deep groove ball bearing (20), a suspension joint (21) and a connecting pin (22). A suspension shaft (18) is provided inside the suspension sleeve (17) near the spear scoop seat (14). The outside of the suspension shaft (18) is threadedly connected to the spring seat (16). One end of the outside of the suspension shaft (18) near the spring seat (16) is rotatably connected to the suspension sleeve (17) via the thrust ball bearing (19). One end of the outside of the suspension shaft (18) away from the spring seat (16) is rotatably connected to the suspension sleeve (17) via the deep groove ball bearings (20). A suspension joint (21) is fixed inside the suspension sleeve (17) and at one end of the suspension shaft (18). Connecting pins (22) are provided inside the top and bottom ends of the suspension sleeve (17) and at positions corresponding to the suspension joint (21).

4. A novel closed coring device according to claim 3, characterized in that: A pressure-holding hole (39) is provided inside the suspension joint (21), a drainage hole (40) is provided at the top and bottom of the suspension sleeve (17) away from the suspension shaft (18), and a second connecting pin (41) is provided inside the suspension sleeve (17) and at an internal transition fit at the end away from the drill bit (2) at the drainage hole (40).

5. A novel closed coring device according to claim 3, characterized in that: Positioning holes (11) are provided at the top and bottom ends of the push cylinder (8) near one end of the drill joint (3), and the interior of the positioning hole (11) is transitionally matched with the second connecting pin (41).

6. A novel closed coring device according to claim 1, characterized in that: A first diversion groove (23) is provided inside the ball seat (6) at one end close to the drill joint (3), and a second diversion groove (24) is provided inside the ball seat (6) at the top and bottom of the end away from the drill joint (3) and the first diversion groove (23).

7. A novel closed coring device according to claim 1, characterized in that: The valve assembly comprises a sealed ball valve (10), a lower valve body (25) and a retaining spring (26); the lower valve body (25) is fixed inside the outer cylinder (1) and at one end of the drill bit (2) close to the drill tool joint (3); the lower valve body (25) is fixed to the inner cylinder (9); the sealed ball valve (10) is rotatably connected inside the lower valve body (25); a movable hole is provided inside the sealed ball valve (10); and the retaining spring (26) is fixed inside the end of the lower valve body (25) away from the drill bit (2).

8. A novel closed coring device according to claim 7, characterized in that: A limiting mechanism is installed inside the inner cylinder (9) at one end close to the closed ball valve (10), and the limiting mechanism includes a blocking plate (28), a rotating column (29), a limiting plate (30), a support plate (31) and a torsion spring (32). Four blocking plates (28) are evenly distributed on the inner side of the inner cylinder (9), and the internal rotation of one end of the blocking plate (28) is connected to the rotating column (29). The top and bottom of the rotating column (29) are fixed with a support plate (31), and the support plate (31) is fixed to the inner cylinder (9). A torsion spring (32) is fixed between the blocking plate (28) and the support plate (31) and located on the outside of the rotating column (29). The limiting plate (30) is fixed on the outside of the rotating column (29), and the limiting plate (30) is slidably connected to the blocking plate (28).

9. A novel closed coring device according to claim 8, characterized in that: A limiting groove (33) is provided on the inner side of the blocking plate (28) at a position corresponding to the limiting plate (30), and the limiting groove (33) is slidably connected to the limiting plate (30).

10. A novel closed coring device according to claim 8, characterized in that: A pushing mechanism is installed inside the inner cylinder (9) near one end of the sealed ball valve (10) and between two adjacent blocking plates (28). The pushing mechanism includes a threaded rod (27), a fixed shell (34), a telescopic shell (35), a telescopic plate (36), a positioning plate (37) and a driving motor (38). The fixed shell (34) is fixed to the inner cylinder (9). The fixed shell (34) is slidably connected to the telescopic shell (35) near one end of the sealed ball valve (10). The telescopic shell (35) is close to the sealed ball valve (10). A telescopic plate (36) is slidably connected to the interior of one end of the valve (10), a driving motor (38) is fixed to the interior of the fixed shell (34) away from the sealed ball valve (10), an output end of the driving motor (38) and located inside the fixed shell (34) is connected to a threaded rod (27), the threaded rod (27) is threadedly connected to the telescopic plate (36) on the outer side close to the end of the sealed ball valve (10), and positioning plates (37) are fixed to both sides of the interior of the telescopic shell (35) away from the sealed ball valve (10).

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