A drilling integrated closed sampling device and sampling method for mining

Abstract

The invention discloses a closed sampling device and a sampling method for integrated drilling for mining, the closed sampling device for integrated drilling for mining comprises an outer cylinder assembly, a silo assembly and a transmission assembly, the outer cylinder assembly comprises a drill rod joint, an outer cylinder and a sampling drill bit, the silo assembly is arranged inside the outer cylinder, and comprises a fixed mandrel, a silo exhaust joint, a silo barrel and a ball valve; the transmission assembly comprises a piston, a thrust sleeve, a reset spring and an ejector pin; the fixed mandrel is provided with two water flow holes, namely, a first water flow hole of the fixed mandrel and a second water flow hole of the fixed mandrel. The invention is simple to operate, highly applicable, easy to maintain, safe and efficient, realizes the collection of coal samples while the drill rod is drilling, that is, integrated drilling, avoids the heating or even ignition of the coal body caused by dry drilling sampling during drilling separation, and can ensure that the coal sample is in a closed state during the collection process, avoids the gas loss in the coal sample, and effectively improves the safety and accuracy of the gas content determination in coal mines.

Description

Technical Field

[0001] The invention relates to the technical field of underground gas content testing in coal mines, and in particular to a drilling-integrated closed sampling device for mining and a sampling method. Background Art

[0002] Accurate determination of gas content has always been a difficult and important point in coal mine safety production. Commonly used gas content testing methods include direct method and indirect method. The indirect method requires that the measured gas pressure is true and reliable, but the gas pressure measurement cycle is long and the success rate is low. The direct method requires deep hole sampling, and then uses the gas desorption method to test the gas content of the coal sample. Its accuracy depends on the amount of gas escape during the deep hole sampling process.

[0003] The "Direct Determination Method for Gas Content in Coal Seams Underground (GB / T 23250-2009)" stipulates that the shorter the sampling time, the better. When the hole depth is greater than 20 m, the sampling time shall not exceed 10 min. When the hole depth is less than 20 m, the sampling time shall not exceed 5 min. The existing sampling methods for underground gas content testing in coal mines have formed technologies such as drill cuttings sampling, casing sampling, rope sampling, and compressed air sampling. Although the sampling depth of the above methods is relatively large, the sampling time is generally long, and gas is easily released quickly, resulting in inaccurate loss gas measurement, affecting the accuracy of gas content measurement.

[0004] Therefore, how to develop a device and method that integrates drilling and sampling, which can implement closed sampling during the drilling process and effectively shorten the sampling time, is a problem that needs to be solved at present. Summary of the invention

[0005] In order to solve the problems of the prior art, the present invention provides a drilling-integrated closed sampling device and sampling method for mining, which are simple to operate, highly applicable, easy to maintain, safe and efficient, and realize the collection of coal samples while the drill rod is drilling, that is, drilling integration, avoiding the heating and even ignition of the coal body caused by dry drilling sampling during drilling separation, and can ensure that the coal sample is in a closed state during the collection process, avoiding the loss of gas in the coal sample, and effectively improving the safety and accuracy of the determination of gas content in underground coal mines.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A drilling integrated closed sampling device for mining, comprising an outer cylinder assembly, a silo assembly and a transmission assembly, wherein:

[0008] The outer cylinder assembly comprises a drill rod joint, an outer cylinder and a sampling drill bit. The left end of the drill rod joint is detachably fixedly connected to the drill rod of the drilling rig, and the right end is detachably fixedly connected to the outer cylinder. The left end of the outer cylinder is detachably fixedly connected to the drill rod joint, and the right end is detachably fixedly connected to the sampling drill bit. The middle sampling hole of the sampling drill bit is provided with a sealing cover connected to the sampling hole. When drilling, the sealing cover closes the sampling hole, and when sampling, the sealing cover opens the sampling hole.

[0009] The silo assembly is arranged inside the outer cylinder, and includes a fixed mandrel, a silo exhaust joint, a silo barrel and a ball valve; the left end of the fixed mandrel is detachably fixedly connected to the drill pipe joint, and the right end is detachably fixedly connected to the silo exhaust joint; the silo exhaust joint is detachably fixedly connected to the silo barrel, and the right end of the silo barrel is detachably fixedly connected to the left end of the ball valve; the ball valve includes a ball valve core and a ball valve shaft, and a gear is provided on the ball valve shaft;

[0010] The transmission assembly includes a piston, a propulsion sleeve, a return spring and an ejector pin; the piston is slidably sleeved on the fixed core shaft, and the piston is slidably matched with the inner wall of the outer cylinder barrel; the left end of the piston is in contact with the drill pipe joint, and the left end of the piston forms a piston cavity with the outer cylinder barrel, and the right end of the piston is in contact with the propulsion sleeve; the propulsion sleeve is sleeved on the silo barrel and slidably matched with the inner wall of the outer cylinder barrel, the left end of the propulsion sleeve is in contact with the piston, and the right end is in contact with the ejector pin; a rack is arranged on the propulsion sleeve, and the rack is meshed with the gear on the rotating shaft of the ball valve; the ejector pin is slidably matched with the inner wall of the outer cylinder barrel, and an axial channel is arranged at the center of the ejector pin, the left end of the ejector pin is slidably sealed and connected with the right end of the ball valve through the channel, and the right end of the ejector pin extends to the sampling hole of the sampling drill bit; a return spring is sleeved on the ejector pin, the left end of the return spring is in contact with the ejector pin, and the right end of the return spring is in contact with the right end of the outer cylinder barrel;

[0011] The fixed core shaft is provided with two water flow holes, namely the first water flow hole of the fixed core shaft and the second water flow hole of the fixed core shaft. The first water flow hole of the fixed core shaft is connected to the piston cavity, and the piston is also provided with a piston water flow hole; when the equipment is drilling, the piston water flow hole is connected to the second water flow hole of the fixed core shaft, and the cooling water passes through the second water flow hole of the fixed core shaft, and enters the sampling drill bit through the piston water flow hole and the outer cylinder; when the equipment is sampling, high-pressure water enters the piston cavity through the first water flow hole of the fixed core shaft, and at the same time, the piston moves to disconnect the piston water flow hole from the second water flow hole of the fixed core shaft.

[0012] The left end of the drill pipe joint is connected to the drill pipe of the drilling rig through a thread, and the right end is connected to the outer cylinder through a thread; the left end of the outer cylinder is connected to the drill pipe joint through a thread, and the right end is connected to the sampling drill bit through a thread.

[0013] The left end of the fixed core shaft is connected to the threaded drill rod joint, and the right end is connected to the silo exhaust joint through a thread; the silo exhaust joint is connected to the silo barrel through a thread, the left end of the silo barrel is connected to the silo exhaust joint through a thread, and the right end is connected to the left end of the ball valve through a thread.

[0014] The silo exhaust joint is connected to the inner wall of the silo tube through an external thread. Two connected threaded holes are set in the center of the silo exhaust joint. The left threaded hole is connected to the fixed core shaft, and the right threaded hole has a built-in sealing ring, a sealing steel ball, a compression spring and a compression nut.

[0015] The ejector pin comprises a large cylindrical section, a truncated cone section and a small cylindrical section which are coaxially connected as a whole. The large cylindrical section is butted against the large diameter end of the truncated cone section, while the small cylindrical section is butted against the small diameter end of the truncated cone section. Meanwhile, the large cylindrical section is slidingly and sealingly connected to the right end of the ball valve, while the small cylindrical section extends to the sampling hole of the sampling drill bit. When sampling, the small cylindrical section moves rightward to push open the sealing cover.

[0016] A step is formed at the joint between the large diameter ends of the large cylindrical section and the truncated cone section on the ejector pin, and the left end of the return spring is connected to the step.

[0017] A sealing ring is arranged between the drill rod joint and the outer cylinder, a sealing ring is arranged between the drill rod joint and the fixed core shaft, a sealing ring is arranged between the fixed core shaft and the silo exhaust joint, a sealing ring is arranged between the piston and the outer cylinder, a sealing ring is arranged between the piston and the fixed core shaft, a sealing ring is arranged between the large cylindrical section of the ejector pin and the silo tube, a sealing ring is arranged between the ball valve and the silo tube, and a sealing ring is arranged between the ball valve and the propulsion sleeve.

[0018] The present invention also discloses a drilling integrated mining closed sampling method, using the drilling integrated mining closed sampling device, comprising the following steps:

[0019] (1) During drilling, the drill rod of the drilling rig drives the sampler to drill. During the drilling process, the ball valve is closed and the sealing cover is closed to ensure that no coal powder and other pollutants enter the silo assembly during the drilling process; cooling water passes through the second water flow hole of the fixed core shaft, the piston water flow hole and the outer cylinder barrel in turn and enters the sampling drill bit to cool the drill bit;

[0020] (2) When drilling to the predetermined position and starting sampling, increase the pressure of the cooling water pump of the drilling rig, and high-pressure water enters the piston cavity through the first water flow hole of the fixed core shaft, pushing the piston to the right, and the piston drives the thrust sleeve, and the rack on the thrust sleeve drives the gear on the ball valve shaft of the ball valve to rotate, and then the ball center of the ball valve rotates 90°, and the ball valve opens; the right end of the thrust sleeve drives the ejector pin to move to the right, and the ejector pin pushes the sealing cover open;

[0021] (3) The drilling rig continues to work and starts sampling. The coal sample enters the silo through the sampling drill bit, the thimble and the ball valve;

[0022] (4) When sampling is finished, turn off the cooling water pump of the drilling rig, and the reset spring pushes the ejector pin, the thrust sleeve and the piston to the left until the piston contacts the drill pipe joint. At the same time, the rack on the thrust sleeve drives the gear on the ball valve shaft of the ball valve to rotate, and then the ball center of the ball valve rotates 90°, the ball valve is closed, and sampling is completed;

[0023] (5) After sampling, remove the drill pipe joint, fixed core shaft and piston in turn, install the gas detection tool into the silo exhaust joint, and the gas in the silo tube enters the gas detection tool; finally, take out the silo assembly, open the ball valve, and pour out the coal sample in the silo tube for analysis and inspection.

[0024] Beneficial effects of the present invention:

[0025] (1) Reasonable structure: The present invention adopts a structure of a piston and a return spring combination to control the opening of the ball valve. When sampling, the water pump pressure is increased. Under the action of high-pressure water, the piston pushes the push sleeve to move, and the rack on the push sleeve drives the ball valve to open. At the same time, the push sleeve drives the ejector pin to move, and the sealing cover of the sampling drill bit is pushed open. When the sampling is completed, the water pump pressure is lowered, and the return spring pushes the push sleeve to reset, closes the ball valve, and the sealing cover of the sampling drill bit returns to its original position, thereby achieving the effect of sealing the silo. The fixed core shaft of the present invention is provided with two water holes. The first water hole of the fixed core shaft is connected to the piston cavity, and the second water hole of the fixed core shaft is connected to the piston water hole during drilling. The cooling water can smoothly reach the sampling drill bit during drilling. When sampling, the second water hole of the fixed core shaft is disconnected from the piston water hole to ensure that the piston cavity has sufficient pressure to drive the transmission component.

[0026] (2) Simple operation: Before drilling, the present invention is threadedly connected to the drill pipe. During drilling, the drilling rig only needs to be operated normally. When sampling, the water pump pressure connected to the drilling rig is increased. When sampling is completed, the water pump pressure is lowered. There is no need to withdraw the drill and replace the sampling device again.

[0027] (3) The sample is pollution-free: the sampling hole in the middle of the sampling drill bit of the present invention is provided with a sealing cover. When drilling, the silo is closed, ensuring that no pollutants enter the silo and the silo feeding section. When sampling, the ejector pin pushes open the sealing cover, the silo automatically opens, and the sampling hole feeds normally. After sampling, the sealing cover returns to its original position and the silo automatically closes, ensuring the absolute purity of the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the fixed mandrel structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the ball valve structure of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the transmission assembly of the present invention;

[0032] Figure 5 It is a schematic diagram of the structure of the sampling drill bit of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of the silo exhaust joint of the present invention;

[0034] Figure 7 It is a schematic diagram of the workflow of the present invention.

[0035] Markings in the figure: 1. drill pipe joint, 2. outer cylinder, 3. sampling drill bit, 4. fixed core shaft, 5. piston, 6. thrust sleeve, 7. silo exhaust joint, 8. ball valve, 9. ball valve shaft, 10. ball valve core, 11. ejector pin, 12. return spring, 13. sealing cover, 14. sealing steel ball, 15. compression spring, 16. compression nut, 17. silo tube, 18. gear, 19-26 sealing ring, 401, first water flow hole of fixed core shaft, 402, second water flow hole of fixed core shaft.

[0036] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and beneficial effects of the present invention clearer, the embodiments of the present invention are further described in detail in conjunction with the accompanying drawings. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "inside" and "outside" used in the following description refer to the direction toward or away from the geometric center of a specific component, respectively, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. "Right" is the direction where the sampling drill bit 3 is located, and "left" is the direction where the drill pipe joint 1 is located.

[0038] like Figures 1 to 6 As shown, a drilling integrated closed sampling device for mining in this embodiment includes an outer cylinder assembly, a silo assembly and a transmission assembly, wherein:

[0039] The outer cylinder assembly includes a drill pipe joint 1, an outer cylinder 2 and a sampling drill bit 3. The left end of the drill pipe joint 1 is connected to the drill pipe of the drilling rig through a thread, and the right end is connected to the outer cylinder 2 through a thread; the left end of the outer cylinder 2 is connected to the drill pipe joint 1 through a thread, and the right end is connected to the sampling drill bit 3 through a thread. The sampling hole in the middle of the sampling drill bit 3 is provided with a sealing cover 13 connected to the sampling hole. When drilling, the sealing cover 13 closes the sampling hole, and when sampling, the sealing cover 13 opens the sampling hole.

[0040] The silo assembly is arranged inside the outer cylinder 2, and includes a fixed mandrel 4, a silo exhaust joint 7, a silo barrel 17 and a ball valve 8. The left end of the fixed mandrel 4 is connected to the drill pipe joint, and the right end is connected to the silo exhaust joint 7 through a thread.

[0041] The silo exhaust joint 7 is connected to the inner wall of the silo tube 17 through external threads, and the right end of the silo tube 17 is connected to the left end of the ball valve 8 through threads. Two threaded holes are arranged in the center of the silo exhaust joint, the left threaded hole is connected to the fixed core shaft, and the right threaded hole is built with a sealing ring 26, a sealing steel ball 14, a compression spring 15 and a compression nut 16, which are used to discharge the gas in the silo assembly.

[0042] The ball valve 8 comprises a ball valve core 10 , a ball valve seal 9 and a ball valve shaft 9 , on which a gear 18 is provided.

[0043] The transmission assembly includes a piston 5, a propulsion sleeve 6, a return spring 12 and an ejector pin 11, and the transmission assembly is used to control the opening and closing of the ball valve. The piston 5 is slidably sleeved on the fixed core shaft 4, and the piston and the inner wall of the outer cylinder 2 are slidably matched; the left end of the piston 5 contacts the drill pipe joint 1, and the left end of the piston and the outer cylinder 2 form a piston cavity, and the right end of the piston 5 contacts the propulsion sleeve 6.

[0044] The push sleeve 6 is sleeved on the silo tube 17 and slidably cooperates with the inner wall of the outer cylinder tube 2. The left end of the push sleeve 6 contacts the piston 5, and the right end contacts the ejector pin 11. A rack is arranged on the push sleeve 6, and the rack meshes with the gear 18 on the ball valve shaft 9.

[0045] The ejector pin 11 is slidably matched with the inner wall of the outer cylinder 2, and an axial channel is provided in the center of the ejector pin. The left end of the ejector pin 11 is slidably and sealedly connected with the right end of the ball valve through the channel, and the right end of the ejector pin 11 extends to the sampling hole of the sampling drill bit 3; a return spring 12 is sleeved on the ejector pin 11, the left end of the return spring 12 contacts with the ejector pin, and the right end of the return spring 12 contacts with the right end portion of the outer cylinder 2.

[0046] Specifically, the ejector pin 11 includes a large cylindrical section, a conical section and a small cylindrical section that are coaxially connected as a whole. The large cylindrical section is connected to the large diameter end of the conical section, and the small cylindrical section is connected to the small diameter end of the conical section. At the same time, the large cylindrical section is slidingly and sealingly connected to the right end of the ball valve, and the small cylindrical section extends to the sampling hole of the sampling drill bit 3.

[0047] At the same time, a step is formed at the joint between the large diameter ends of the large cylindrical section and the truncated cone section on the ejector pin 11, and the left end of the return spring 12 is connected to the step.

[0048] The fixed core shaft 4 is provided with two water flow holes, namely the first water flow hole 401 of the fixed core shaft and the second water flow hole 402 of the fixed core shaft. The first water flow hole 401 of the fixed core shaft is connected with the piston cavity, and the piston 5 is also provided with a piston water flow hole; when the equipment is drilling, the piston water flow hole 5 is connected with the second water flow hole 402 of the fixed core shaft, and the cooling water passes through the second water flow hole 402 of the fixed core shaft, and enters the sampling drill bit 3 through the piston water flow hole and the outer cylinder 2; when the equipment is sampling, high-pressure water enters the piston cavity through the first water flow hole 401 of the fixed core shaft, and at the same time, the piston moves to disconnect the piston water hole from the second water flow hole 402 of the fixed core shaft, thereby ensuring that the piston cavity has sufficient pressure to push the transmission component.

[0049] To ensure the sealing effect, a sealing ring 20 is arranged between the drill rod joint 1 and the outer cylinder 2, a sealing ring 19 is arranged between the drill rod joint 1 and the fixed core shaft 4, a sealing ring is arranged between the fixed core shaft 4 and the silo exhaust joint 7, a sealing ring 22 is arranged between the silo exhaust joint 7 and the silo tube 17, a sealing ring 21 is arranged between the piston 5 and the outer cylinder 2, a sealing ring is arranged between the piston 5 and the fixed core shaft 4, a sealing ring 25 is arranged between the large cylindrical section of the ejector pin 11 and the silo tube 17, a sealing ring is arranged between the ball valve 8 and the silo tube 17, and a sealing ring 23 is arranged between the ball valve 8 and the propulsion sleeve 6.

[0050] The integrated closed sampling device for mining of the present embodiment is used for fixed-point closed sampling of deep holes in coal mines.

[0051] As shown in Figure 7, this embodiment also discloses a drilling integrated mining closed sampling method, using the drilling integrated mining closed sampling device, including the following steps:

[0052] (1) Before working, assemble all parts according to the above positional relationship. During drilling, the drill rod of the drilling rig drives the sampler to drill. During the drilling process, the ball valve 8 is closed and the sealing cover 13 is closed to ensure that no coal powder and other pollutants enter the silo assembly during the drilling process; cooling water passes through the second water flow hole 402 of the fixed core shaft, the piston water flow hole and the outer cylinder 2, and enters the sampling drill bit 3 to cool the drill bit.

[0053] (2) When drilling to the predetermined position and starting sampling, increase the pressure of the cooling water pump of the drilling rig, and high-pressure water enters the piston cavity through the first water flow hole 401 of the fixed core shaft, pushing the piston 5 to move rightward, and the piston 5 drives the push sleeve 6, and the rack on the push sleeve 6 drives the gear 18 on the ball valve shaft 9 of the ball valve 8 to rotate, and then the ball valve center 10 of the ball valve 8 rotates 90°, and the ball valve opens. The right end of the push sleeve 6 drives the ejector pin 11 to move rightward, and the ejector pin 11 pushes the sealing cover 13 open.

[0054] (3) The drilling rig continues to work and starts sampling. The coal sample passes through the sampling drill bit 3, the ejector pin 11 and the ball valve 8 into the silo tube 17;

[0055] (4) When sampling is finished, the cooling water pump of the drilling rig is turned off, and the return spring 12 pushes the ejector pin 11, the thrust sleeve 6 and the piston 5 to move to the left until the piston 5 contacts the drill pipe joint 1. At the same time, the rack on the thrust sleeve 6 drives the gear 18 on the ball valve shaft 9 of the ball valve 8 to rotate, and then the ball valve center 10 of the ball valve 8 rotates 90°, the ball valve is closed, and sampling is completed.

[0056] (5) After sampling, remove the drill pipe joint 1, fixed mandrel 4, and piston 5 in turn, install the gas detection tool into the silo exhaust joint, and the ejector pin on the gas detection tool pushes the sealing steel ball 14 open, and the gas in the silo tube 17 enters the gas detection tool. Finally, take out the silo assembly, open the ball valve 8, and pour out the coal sample in the silo 13 for analysis and inspection.

[0057] The present invention adopts a structure of a piston and a reset spring combination to control the opening of the ball valve. When sampling, the water pump pressure is increased, and the piston pushes the propulsion sleeve to move under the action of high-pressure water. The rack on the propulsion sleeve drives the ball valve to open, and the propulsion sleeve drives the ejector pin to move, and the sealing cover of the sampling drill bit is pushed open. When the sampling is completed, the water pump pressure is lowered, the reset spring pushes the propulsion sleeve to reset, the ball valve is closed, and the sealing cover of the sampling drill bit returns to its original position, thereby achieving the effect of sealing the silo.

[0058] The invention is easy to operate. Before drilling, the invention is threadedly connected to the drill rod. During drilling, the drilling rig only needs to be operated normally. When sampling, the water pump pressure connected to the drilling rig is increased. When sampling is completed, the water pump pressure is lowered. There is no need to withdraw the drill and replace the sampling device again.

[0059] The samples of the present invention are pollution-free. The sampling hole in the middle of the sampling drill bit is provided with a sealing cover. The silo is closed during drilling, ensuring that no pollutants enter the silo and the silo feeding section. During sampling, the ejector pin pushes open the sealing cover, the silo automatically opens, and the sampling hole feeds normally. After sampling, the sealing cover returns to its original position, and the silo automatically closes, ensuring the absolute purity of the sample.

[0060] The present invention is simple to operate, highly applicable, easy to maintain, safe and efficient, and realizes the collection of coal samples while the drill rod is drilling, that is, drilling and sampling are integrated, avoiding the heating and even ignition of the coal body caused by dry drilling sampling during drilling and sampling separation, and can ensure that the coal sample is in a closed state during the collection process, avoiding the loss of gas in the coal sample, and effectively improving the safety and accuracy of the gas content determination in coal mines.

[0061] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A drilling integrated closed sampling device for mining, characterized in that: It includes an outer cylinder assembly, a silo assembly and a transmission assembly, wherein: The outer cylinder assembly comprises a drill rod joint, an outer cylinder and a sampling drill bit. The left end of the drill rod joint is detachably fixedly connected to the drill rod of the drilling rig, and the right end is detachably fixedly connected to the outer cylinder. The left end of the outer cylinder is detachably fixedly connected to the drill rod joint, and the right end is detachably fixedly connected to the sampling drill bit. The middle sampling hole of the sampling drill bit is provided with a sealing cover connected to the sampling hole. When drilling, the sealing cover closes the sampling hole, and when sampling, the sealing cover opens the sampling hole. The silo assembly is arranged inside the outer cylinder, and includes a fixed mandrel, a silo exhaust joint, a silo barrel and a ball valve; the left end of the fixed mandrel is detachably fixedly connected to the drill pipe joint, and the right end is detachably fixedly connected to the silo exhaust joint; the silo exhaust joint is detachably fixedly connected to the silo barrel, and the right end of the silo barrel is detachably fixedly connected to the left end of the ball valve; the ball valve includes a ball valve core and a ball valve shaft, and a gear is provided on the ball valve shaft; The transmission assembly includes a piston, a propulsion sleeve, a return spring and an ejector pin; the piston is slidably sleeved on the fixed core shaft, and the piston is slidably matched with the inner wall of the outer cylinder barrel; the left end of the piston is in contact with the drill pipe joint, and the left end of the piston forms a piston cavity with the outer cylinder barrel, and the right end of the piston is in contact with the propulsion sleeve; the propulsion sleeve is sleeved on the silo barrel and slidably matched with the inner wall of the outer cylinder barrel, the left end of the propulsion sleeve is in contact with the piston, and the right end is in contact with the ejector pin; a rack is arranged on the propulsion sleeve, and the rack is meshed with the gear on the rotating shaft of the ball valve; the ejector pin is slidably matched with the inner wall of the outer cylinder barrel, and an axial channel is arranged at the center of the ejector pin, the left end of the ejector pin is slidably sealed and connected with the right end of the ball valve through the channel, and the right end of the ejector pin extends to the sampling hole of the sampling drill bit; a return spring is sleeved on the ejector pin, the left end of the return spring is in contact with the ejector pin, and the right end of the return spring is in contact with the right end of the outer cylinder barrel; The fixed mandrel is provided with two water flow holes, namely the first water flow hole of the fixed mandrel and the second water flow hole of the fixed mandrel. The first water flow hole of the fixed mandrel is connected to the piston cavity, and the piston is also provided with a piston water flow hole. When the equipment is drilling, the piston water flow hole is connected to the second water flow hole of the fixed mandrel, and the cooling water passes through the second water flow hole of the fixed mandrel, the piston water flow hole and the outer cylinder into the sampling drill bit; when the equipment is sampling, high-pressure water enters the piston cavity through the first water flow hole of the fixed mandrel, and at the same time, the piston moves to disconnect the piston water flow hole from the second water flow hole of the fixed mandrel. The left end of the drill pipe joint is connected to the drill pipe of the drilling rig through a thread, and the right end is connected to the outer cylinder through a thread; the left end of the outer cylinder is connected to the drill pipe joint through a thread, and the right end is connected to the sampling drill bit through a thread; The left end of the fixed core shaft is connected to the threaded drill rod joint, and the right end is connected to the silo exhaust joint through a thread; the silo exhaust joint is connected to the silo barrel through a thread, the left end of the silo barrel is connected to the silo exhaust joint through a thread, and the right end is connected to the left end of the ball valve through a thread.

2. The drilling integrated closed sampling device for mining according to claim 1 is characterized in that: The silo exhaust joint is connected to the inner wall of the silo tube through an external thread. Two connected threaded holes are set in the center of the silo exhaust joint. The left threaded hole is connected to the fixed core shaft, and the right threaded hole has a built-in sealing ring, a sealing steel ball, a compression spring and a compression nut.

3. The drilling integrated closed sampling device for mining according to claim 1 or 2, characterized in that: The ejector pin comprises a large cylindrical section, a truncated cone section and a small cylindrical section which are coaxially connected as a whole. The large cylindrical section is butted against the large diameter end of the truncated cone section, while the small cylindrical section is butted against the small diameter end of the truncated cone section. Meanwhile, the large cylindrical section is slidingly and sealingly connected to the right end of the ball valve, while the small cylindrical section extends to the sampling hole of the sampling drill bit. When sampling, the small cylindrical section moves rightward to push open the sealing cover.

4. The drilling integrated closed sampling device for mining according to claim 3 is characterized in that: A step is formed at the joint between the large diameter ends of the large cylindrical section and the truncated cone section on the ejector pin, and the left end of the return spring is connected to the step.

5. The drilling integrated closed sampling device for mining according to claim 3 is characterized in that: A sealing ring is arranged between the drill rod joint and the outer cylinder, a sealing ring is arranged between the drill rod joint and the fixed core shaft, a sealing ring is arranged between the fixed core shaft and the silo exhaust joint, a sealing ring is arranged between the piston and the outer cylinder, a sealing ring is arranged between the piston and the fixed core shaft, a sealing ring is arranged between the large cylindrical section of the ejector pin and the silo tube, a sealing ring is arranged between the ball valve and the silo tube, and a sealing ring is arranged between the ball valve and the propulsion sleeve.

6. A closed sampling method for integrated drilling in mining, using the closed sampling device for integrated drilling in mining as claimed in any one of claims 1 to 5, characterized in that The following steps are involved: (1) During drilling, the drill rod of the drilling rig drives the sampler to drill. During the drilling process, the ball valve is closed and the sealing cover is closed to ensure that no coal powder and other pollutants enter the silo assembly during the drilling process; cooling water passes through the second water flow hole of the fixed core shaft, the piston water flow hole and the outer cylinder barrel in turn and enters the sampling drill bit to cool the drill bit; (2) When drilling to the predetermined position and starting sampling, increase the pressure of the cooling water pump of the drilling rig, and high-pressure water enters the piston cavity through the first water flow hole of the fixed core shaft, pushing the piston to the right, and the piston drives the thrust sleeve, and the rack on the thrust sleeve drives the gear on the ball valve shaft of the ball valve to rotate, and then the ball center of the ball valve rotates 90°, and the ball valve opens; the right end of the thrust sleeve drives the ejector pin to move to the right, and the ejector pin pushes the sealing cover open; (3) The drilling rig continues to work and starts sampling. The coal sample enters the silo through the sampling drill bit, the thimble and the ball valve; (4) When sampling is finished, turn off the cooling water pump of the drilling rig, and the reset spring pushes the ejector pin, the thrust sleeve and the piston to the left until the piston contacts the drill pipe joint. At the same time, the rack on the thrust sleeve drives the gear on the ball valve shaft of the ball valve to rotate, and then the ball center of the ball valve rotates 90°, the ball valve is closed, and sampling is completed; (5) After sampling, remove the drill pipe joint, fixed core shaft and piston in turn, install the gas detection tool into the silo exhaust joint, and the gas in the silo tube enters the gas detection tool; finally, take out the silo assembly, open the ball valve, and pour out the coal sample in the silo tube for analysis and inspection.

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