A gas dynamic sealing coring device and method for soft coal

Abstract

The application discloses a kind of broken soft coal seam gas dynamic sealing coring device and method, including coring outer cylinder, coring drill bit and adapter;Adapter is provided with pressing ball seat inside, the lower end inside of pressing ball seat is sleeved with locking mechanism core pipe, locking mechanism core pipe is also sleeved with the main body pipe of axially movable force storage mechanism outside;The lower end of force storage mechanism main body pipe is connected coring inner cylinder through the axially movable force storage mechanism main body pipe extension section;The outer wall of force storage mechanism main body pipe is equipped with limiting step, force storage mechanism main body pipe is also sleeved with locking sliding sleeve outside, and limiting step and locking sliding sleeve are also provided with force storage spring;Locking ball is embedded on the pipe wall of the lower end of force storage mechanism main body pipe, and locking ball can be axially positioned to locking sliding sleeve;Sealing ball valve is provided in coring inner cylinder, and push cylinder can be axially moved to close sealing ball valve under the push of locking sliding sleeve.The application solves the problems such as jet orifice and hole collapse of existing sealing coring device in broken soft coal seam.

Description

Technical Field

[0001] This invention belongs to the field of coal mine safety and geological exploration technology, and relates to a pneumatic closed coring device and method for soft coal seams. Background Technology

[0002] my country's coal seams are characterized by complex geological conditions, including fractured coal bodies, low permeability, and high gas pressure. Fragmented and soft coal seams are extremely common in high-gas mines and coal and gas outburst mines. Coal seam gas content is a fundamental parameter for mine gas disaster prediction and prevention, gas resource evaluation, and development. Due to the susceptibility to blowouts and borehole collapses when exposed to water, water-based core drilling and hydraulically driven bottom sealing of core holes are not feasible in fragmented and soft high-gas coal seams. Existing sealed core drilling devices mostly use water as the medium. Therefore, mines operating in fragmented and soft coal seams urgently need a deep-hole, fixed-point, sealed core drilling technology to meet the need for accurate long-distance, large-area detection of gas occurrence information in these seams, ensuring safe and efficient mine production. Summary of the Invention

[0003] In view of the defects and deficiencies in the prior art, the present invention provides a pneumatic closed coring device and method for crushed soft coal seams to solve the above-mentioned deficiencies of the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A pneumatic closed coring device for fractured soft coal seams includes a coring outer cylinder, with a coring drill bit and an adapter respectively provided at both ends of the outer cylinder; the lower end of the adapter extends into the outer cylinder, and the lower end of the outer cylinder extends into the coring drill bit; a pressure ball seat is provided inside the adapter, and a sealing ball is provided inside the pressure ball seat;

[0006] The lower end of the pressure ball seat is fitted with a locking mechanism core tube, and the locking mechanism core tube is fitted with an axially movable power storage mechanism main tube; the lower end of the power storage mechanism main tube is connected to the core-taking inner cylinder via an axially movable power storage mechanism main tube extension section.

[0007] The outer wall of the main tube of the power storage mechanism is provided with a limiting step, and a locking sleeve is also sleeved on the outside of the main tube of the power storage mechanism. A power storage spring is also provided between the limiting step and the locking sleeve. A locking ball is embedded on the lower end tube wall of the main tube of the power storage mechanism, and the locking ball can axially limit the locking sleeve.

[0008] An auxiliary spring is also sleeved outside the core tube of the locking mechanism. The upper end of the auxiliary spring is in contact with the lower end face of the pressing ball seat, and the lower end is in contact with the upper end face of the limiting step. An unlocking groove that can accommodate the locking ball is opened on the outer wall of the lower end of the core tube of the locking mechanism.

[0009] The lower end of the locking sleeve is externally coaxially sleeved with a pushing cylinder, the force storage mechanism main pipe extension section and the coring inner cylinder are all sleeved in the pushing cylinder; the coring inner cylinder is internally provided with a sealing ball valve, and the pushing cylinder can be axially moved to close the sealing ball valve under the pushing of the locking sleeve.

[0010] The application also has the following technical features:

[0011] Specifically, the force storage mechanism main pipe comprises a first connecting section and a second connecting section which are integrally and communicatively arranged, the upper end of the first connecting section extends into the adapter, the second connecting section is arranged in abutment with the locking mechanism core pipe, and the lower end of the second connecting section extends into the locking sleeve; the outer diameter of the first connecting section is larger than that of the second connecting section, and a limiting step is formed at the connecting position of the first connecting section and the second connecting section.

[0012] The top end of the force storage spring is in abutment with the lower end surface of the limiting step, and the bottom end is in abutment with the upper end surface of the locking sleeve.

[0013] Further, a through mounting hole is formed in the lower end pipe wall of the force storage mechanism main pipe, and the locking ball is embedded in the mounting hole.

[0014] Further, an unlocking groove capable of being clamped with the locking ball is formed in the inner wall of the locking sleeve.

[0015] Further, a sealing knob is arranged at the top end of the sealing ball valve, and the sealing knob is arranged to pass through the through hole formed in the pipe wall of the coring inner cylinder.

[0016] During the axial movement of the pushing cylinder, the sealing knob can be pushed to rotate to close the sealing ball valve.

[0017] Further, the punch ball seat is threadedly connected with the locking mechanism core pipe, the force storage mechanism main pipe is threadedly connected with the adapter, and the locking sleeve is threadedly connected with the pushing cylinder.

[0018] Further, the coring drill bit comprises a hollow drill bit body which is open at both ends; an inner hole channel is arranged in the hollow drill bit body in the axial direction, and a plurality of cutting wings are arranged in the radial direction at the bottom end.

[0019] The application further discloses a pneumatic sealing coring method for soft coal seams, which is realized by the pneumatic sealing coring device for soft coal seams and comprises the following steps.

[0020] Step 1, connect the adapter with the coring drill rod, drill the pneumatic sealing coring device for soft coal seams from the orifice to the preset coring point, and keep the sealing ball valve open during the drilling process.

[0021] Step 2, the plug ball is put into the core drill rod, the high-pressure gas is injected into the core drill rod for pressing, the locking mechanism core pipe is driven to descend by the plug ball, the unlocking groove is moved to the position of the locking ball, the bottom end of the locking ball enters the unlocking groove; the locking sleeve is separated from the force storage mechanism main pipe, the locking sleeve is driven to descend by the force storage spring, and then the pushing cylinder is driven to descend to rotate the sealing knob, and the sealing ball valve is closed;

[0022] Step 3, all the drilling tools in the hole are withdrawn in turn, the core inner cylinder is taken out, and the sealed coring is completed.

[0023] Compared with the prior art, the beneficial technical effect of the present application is:

[0024] The present application solves the technical problems of hole spraying and hole collapse in the application of the prior art in the soft coal seam by means of pneumatic drilling coring and gas-driven in-situ sealing of the coal core hole bottom, and does not need to be matched with a high-pressure water pump and other high-pressure power sources in the process of sealed coring, can maintain a dry environment in the whole hole section during pneumatic drilling, meets the demand of the mine for collecting dry coal samples, ensures that the coal samples are taken to the original gas occurrence and original water content, and makes the measured values of gas content and water content more real and more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the device.

[0026] The numbers in the figure represent:

[0027] 1-core outer cylinder, 2-core drill bit, 3-adaptor, 4-pressing ball seat, 5-plug ball, 6-locking mechanism core pipe, 7-force storage mechanism main pipe, 8-force storage mechanism main pipe extension, 9-core inner cylinder, 10-locking sleeve, 11-pushing cylinder, 12-force storage spring, 13-locking ball, 14-assistant spring, 15-sealing ball valve; 201-hollow drill bit body, 202-inner hole passage, 203-cutting wing; 151-sealing knob; 701-limiting step, 702-first connecting section, 703-second connecting section; 1001-unlocking groove.

[0028] The present application will be specifically described below in combination with the drawings and specific embodiments of the present application. DETAILED DESCRIPTION

[0029] According to the above technical solution, the specific embodiments of the present application are given below, and it should be noted that the present application is not limited to the following specific embodiments, and any equivalent transformation based on the technical solution of the present application falls within the protection scope of the present application. The present application will be further described in detail below in combination with the embodiments.

[0030] In the description of the present application, the terms "upper", "lower", "front", "back", "left", "right" and the like indicate the orientation or positional relationship only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. The orientation description in the present application is as shown in Figure 1

[0031] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. Without the contrary, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected or integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] It should be noted that all parts in the present application, without special description, use parts known in the art.

[0033] The technical concept of the present application is: the force storage mechanism is composed of a force storage mechanism main pipe, a force storage spring and a locking sleeve, the locking mechanism is composed of a locking mechanism core pipe, an auxiliary spring and a locking ball, during installation, the force storage spring is compressed, thereby obtaining sufficient driving force for later pushing by means of the force storage spring, and the locking mechanism is used to complete the limiting connection of the force storage mechanism main pipe and the locking sleeve, so as to maintain the compression amount of the force storage spring, and achieve the purpose of storing driving force for later use; the "switch" principle is adopted to open a large energy with a small energy, the plugging ball is pushed by low-pressure gas, and then the force storage mechanism is triggered by the axial movement of the locking mechanism core pipe, at the moment when the locking sleeve and the force storage mechanism main pipe are separated, the elastic force provided by the force storage spring can push the push cylinder downward, thereby meeting the requirement that the sealed ball valve in the coring inner cylinder is cut off and sealed. The pneumatic sealed coring device can drill the water-retaining coal sample containing original water content in the broken soft coal seam, without matching a high-pressure pump and other high-pressure power sources, and the pressure air system commonly used in the well can complete the triggering of the device.

[0034] ​The main body of the pneumatic sealed coring device adopts a three-cylinder structure, and the three cylinders include a coring outer cylinder, a pushing cylinder and a coring inner cylinder. The coring inner cylinder adopts a structure design of ball valve sealing and coring / desorption integration. The ball valve sealing refers to that the sealing of the coal sample by the sealed coring device adopts a closed mode of a sealed ball valve, and the pressure maintaining capacity is not less than 10 MPa. The coring / desorption integration refers to that the coring inner cylinder is used for collecting the coal sample in the borehole and directly used for gas desorption testing after sampling. Since the locking mechanism and the force storage mechanism are arranged, the components such as the hydraulic piston cylinder, the sealing ring and the pin are not needed, the structure of the pneumatic sealed coring device is simpler, and the disassembly, assembly and maintenance are faster.

[0035] The high-pressure gas in the application includes high-pressure air or high-pressure nitrogen.

[0036] Embodiment 1

[0037] According to the above technical solution, as shown in the embodiment, the pneumatic sealed coring device for soft coal seam crushing is provided. Figure 1 The embodiment provides a pneumatic sealed coring device for soft coal seam crushing, which comprises a coring outer cylinder 1, a coring drill bit 2 and an adapter 3 coaxially arranged at two ends of the coring outer cylinder 1; the adapter 3, the coring outer cylinder and the coring drill bit 2 are coaxially connected in sequence from top to bottom, the lower end of the adapter 3 extends into the coring outer cylinder 1, and the lower end of the coring outer cylinder 1 extends into the coring drill bit 3; a pressing ball seat 4 is arranged in the adapter 3, an inner cavity is arranged in the pressing ball seat 4, a limiting inclined surface is arranged in the inner cavity, the limiting inclined surface can limit a blocking ball 5 put into the inner cavity, a locking mechanism core pipe 6 is sleeved on the inner bottom of the lower end of the pressing ball seat 4, and the upper end of the locking mechanism core pipe 6 extends into the pressing ball seat 4.

[0038] The locking mechanism core pipe 6 is sleeved with an axially movable force storage mechanism main pipe 7; the lower end of the force storage mechanism main pipe 7 is connected with a coring inner cylinder 9 through an axially movable force storage mechanism main pipe extension segment 8, that is, the lower end of the force storage mechanism main pipe 7 is coaxially connected with the axially movable force storage mechanism main pipe extension segment 8, and the lower end of the force storage mechanism main pipe extension segment 8 is coaxially connected with the coring inner cylinder 9; the existence of the force storage mechanism main pipe 7, the force storage mechanism main pipe extension segment 8 and a locking sliding sleeve 10 realizes the connection between the adapter 1 and the pushing cylinder 7, and the force storage mechanism main pipe extension segment 8 can play a role in centralizing the coring inner cylinder 9.

[0039] A limiting step 701 is arranged on the outer wall of the force storage mechanism main pipe 7, and the force storage mechanism main pipe 7 is further sleeved with the locking sliding sleeve 10; a force storage spring 12 is further arranged between the limiting step 701 and the locking sliding sleeve 10, and the locking sliding sleeve 10 can move axially under the elastic force of the force storage spring 12; a locking ball 13 is embedded on the pipe wall of the lower end of the force storage mechanism main pipe 7, the locking ball 13 can axially limit the locking sliding sleeve 10, and the connection between the force storage mechanism main pipe 7 and the locking sliding sleeve 10 is realized.

[0040] The locking mechanism core pipe 6 is further sleeved with an auxiliary spring 14, the upper end of the auxiliary spring 14 is in abutment with the lower end surface of the pressing ball seat 4, and the lower end of the auxiliary spring 14 is in abutment with the upper end surface of the limiting step 701; the lower end outer wall of the locking mechanism core pipe 6 is provided with an unlocking groove 601 capable of accommodating the locking ball 13, and after the locking ball 13 partially enters the unlocking groove 601, the locking sleeve 10 can be unlocked, and the locking sleeve 10 can move downward along the axial direction under the elastic force of the force storage spring 12;

[0041] The lower end of the locking sleeve 10 is coaxially sleeved with a pushing cylinder 11, and the force storage mechanism main pipe extended section 8 and the coring inner cylinder 9 are both sleeved in the pushing cylinder 11; the coring inner cylinder 9 is provided with a sealing ball valve 15, and the pushing cylinder 11 can move along the axial direction to close the sealing ball valve 15 under the pushing of the locking sleeve 9.

[0042] As a preferred scheme of the embodiment, the force storage mechanism main pipe 7 comprises a first connecting section 702 and a second connecting section 703 which are integrally and communicatively arranged, the upper end of the first connecting section 702 extends into the adapter 3, and the outer wall of the first connecting section 702 is threadedly connected with the inner wall of the adapter 3, the first connecting section 702 and the locking mechanism core pipe 6 form an installation cavity, and the auxiliary spring 14 is arranged in the installation cavity; the second connecting section 703 is arranged in abutment with the locking mechanism core pipe 6; the outer diameter of the first connecting section 702 is larger than that of the second connecting section 703, and the first connecting section 702 and the second connecting section 703 form the limiting step 701 at the connecting position; the upper end of the force storage spring 12 is in abutment with the lower end surface of the limiting step 701, and the lower end is in abutment with the upper end surface of the locking sleeve 10.

[0043] As a preferred scheme of the embodiment, the lower end pipe wall of the force storage mechanism main pipe 7 is provided with a through installation hole, and the locking ball 13 is embedded in the installation hole.

[0044] As a preferred scheme of the embodiment, the inner wall of the locking sleeve 10 is provided with an unlocking groove 1001 capable of being clamped with the locking ball 13. When the locking ball 13 is clamped into the unlocking groove 1001, the locking sleeve 10 can be axially limited to prevent the locking sleeve 10 from moving along the axial direction.

[0045] As a preferred scheme of the embodiment, the sealing ball valve 15 is provided with a sealing knob 151 at the top end, and the sealing knob 151 is arranged to pass through the through hole formed in the pipe wall of the coring inner cylinder 9.

[0046] During the axial movement of the pushing cylinder 11, the cylinder wall of the pushing cylinder 11 can push the sealing knob 151 to rotate, so as to close the sealing ball valve 15.

[0047] In the embodiment, the sealing ball valve 15 is provided with two sealing knobs 151 at the opposite two ends along the radial direction of the coring inner cylinder 9.

[0048] As a preferred scheme of the embodiment, the ball seat 4 is threadedly connected with the locking mechanism core pipe 6; the force storage mechanism main pipe 7 is threadedly connected with the adapter 3; and the locking sliding sleeve 10 is threadedly connected with the pushing cylinder 11.

[0049] As a preferred scheme of the embodiment, the core drill 2 comprises a hollow drill body 201 with both ends open; an inner hole channel 202 is arranged axially inside the hollow drill body 201; and a plurality of cutting wings 203 are arranged radially at the bottom end of the hollow drill body 201.

[0050] The use process of the device is as follows:

[0051] The pneumatic sealed coring device is sent to a coring position in a borehole, the coring drill rod is connected with a downhole air compression system or an air compressor, coring drilling is performed by using compressed air, the broken debris of the core drill 2 is discharged out of the hole, the blocking ball 5 is put into the coring drill rod, high-pressure gas is injected into the coring drill rod for pressing, the locking mechanism core pipe 6 is driven to move downward under pressure, the unlocking groove 601 is moved to the position of the locking ball 13, the bottom end of the locking ball 13 enters the unlocking groove 601, the locking sliding sleeve 10 is separated from the force storage mechanism main pipe 7, the locking sliding sleeve 10 is driven to move downward by the force storage spring 12, the pushing cylinder 11 is driven to move downward, the sealing knob 151 is rotated, the sealing ball valve 15 is closed, and the sealed coring is completed.

[0052] Embodiment 2

[0053] The embodiment discloses a pneumatic sealed coring method for broken soft coal seams, which is realized by the pneumatic sealed coring device for broken soft coal seams disclosed in the embodiment 1 and comprises the following steps.

[0054] Step 1, the adapter 3 is connected with the coring drill rod, the pneumatic sealed coring device for broken soft coal seams is drilled from a hole to a preset coring point, and the sealing ball valve 15 is kept open during the drilling process.

[0055] Step 2, the blocking ball 5 is put into the coring drill rod, high-pressure gas is injected into the coring drill rod for pressing, the locking mechanism core pipe 6 is driven to move downward under the pushing of the blocking ball 5, the unlocking groove is moved to the position of the locking ball 13, the bottom end of the locking ball 13 enters the unlocking groove 1001, the locking sliding sleeve 10 is separated from the force storage mechanism main pipe 7, the locking sliding sleeve 10 is driven to move downward by the force storage spring 12, the pushing cylinder 11 is driven to move downward, the sealing knob 151 is rotated, and the sealing ball valve 15 is closed.

[0056] Step 3, all the drilling tools in the hole are withdrawn in sequence, the coring inner cylinder 9 is taken out, and the sealed coring is completed.

[0057] If multi-point coring or replacement of the coring inner cylinder is required when coring fails, the above steps are repeated to take a sample again.

[0058] The application solves the technical problems of jetting and hole collapse in the application of the prior art in the broken soft coal seam by pneumatic drilling coring and gas-driven coal core hole bottom in-situ sealing, does not need to be matched with a high-pressure water pump and other high-pressure power sources, can maintain a dry environment of the whole hole section during pneumatic drilling, meets the demand of the mine for collecting dry coal samples, ensures the drilling of the coal samples with in-situ gas occurrence and original water content, and makes the measured values of the gas content and water content more real and more accurate.

[0059] The above implementation process is only an example for clearly illustrating the present application, and is not a limitation on the implementation mode. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the implementation modes are not required or can not be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A kind of soft coal gas dynamic sealing coring device, comprising coring outer cylinder (1), the coring outer cylinder (1) is provided with coring drill bit (2) and adapter (3) at two ends respectively;The lower end of the adapter (3) extends to the coring outer cylinder (1), and the lower end of the coring outer cylinder (1) extends to the coring drill bit (2);The adapter (3) is provided with press ball seat (4) in, and the press ball seat (4) is provided with blocking ball (5) in, characterized by, The lower end of the pressing ball seat (4) is internally sleeved with a locking mechanism core pipe (6), and the locking mechanism core pipe (6) is further externally sleeved with an axially movable force storage mechanism main pipe (7); the lower end of the force storage mechanism main pipe (7) is connected with a coring inner cylinder (9) through an axially movable force storage mechanism main pipe extension section (8); The outer wall of the force storage mechanism main pipe (7) is provided with a limiting step (701), the force storage mechanism main pipe (7) is further externally sleeved with a locking sliding sleeve (10), and the limiting step (701) and the locking sliding sleeve (10) are further top provided with a force storage spring (12); the lower end pipe wall of the force storage mechanism main pipe (7) is embedded with a locking ball (13), and the locking ball (13) can axially limit the locking sliding sleeve (10); The locking mechanism core pipe (6) is further externally sleeved with an auxiliary spring (14), the upper end of the auxiliary spring (14) is top connected with the lower end face of the pressing ball seat (4), and the lower end of the auxiliary spring (14) is top connected with the upper end face of the limiting step (701); the lower end outer wall of the locking mechanism core pipe (6) is provided with a first unlocking groove capable of accommodating the locking ball (13); The force storage mechanism main pipe extension section (8) and the coring inner cylinder (9) are further coaxially sleeved with a pushing cylinder (11), the coring inner cylinder (9) is provided with a sealing ball valve (15), and the pushing cylinder (11) can axially move to close the sealing ball valve (15); The lower end of the locking sliding sleeve (10) is coaxially sleeved with the pushing cylinder (11) on the outside, and the force storage mechanism main pipe extension section (8) and the coring inner cylinder (9) are sleeved in the pushing cylinder (11); the coring inner cylinder (9) is provided with a sealing ball valve (15), and the pushing cylinder (11) can axially move to close the sealing ball valve (15) under the pushing of the locking sliding sleeve (10); The force storage mechanism main pipe (7) comprises a first connecting section (702) and a second connecting section (703) which are integrally and communicatively arranged, the upper end of the first connecting section (702) extends into the adapter (3), the second connecting section (703) is arranged in close contact with the locking mechanism core pipe (6), and the lower end of the second connecting section (703) extends into the locking sliding sleeve (10); the outer diameter of the first connecting section (702) is greater than that of the second connecting section (703), and the first connecting section (702) and the second connecting section (703) are connected to form the limiting step (701); The top end of the force storage spring (12) is top connected with the lower end face of the limiting step (701), and the bottom end is top connected with the upper end face of the locking sliding sleeve (10); The lower end pipe wall of the force storage mechanism main pipe (7) is provided with a through mounting hole, and the locking ball (13) is embedded in the mounting hole.

2. The gas-operated sealed coring device for soft coal seams as claimed in claim 1, characterized in that, The inner wall of the locking sliding sleeve (10) is provided with an unlocking groove (1001) capable of being clamped with the locking ball (13).

3. The gas-operated sealed coring device for soft coal seams as claimed in claim 1, characterized in that, The top end of the sealing ball valve (15) is provided with a sealing knob (151), and the sealing knob (151) penetrates out of the through hole provided on the pipe wall of the coring inner cylinder (9). The pushing cylinder (11) can push the sealing knob (151) to rotate to close the sealing ball valve (15) during the axial movement of the pushing cylinder (11).

4. The gas-operated sealed coring device for soft coal seams as claimed in claim 1, characterized in that, The pressing ball seat (4) is threadedly connected with the locking mechanism core pipe (6); the force storage mechanism main pipe (7) is threadedly connected with the adapter (3); and the locking sliding sleeve (10) is threadedly connected with the pushing cylinder (11).

5. The gas-operated sealed coring device for soft coal seams as claimed in claim 1, characterized in that, The coring bit (2) comprises a hollow bit body (201) with both ends open; an inner hole channel (202) is arranged axially in the hollow bit body (201); and a plurality of cutting wings (203) are arranged radially at the bottom end of the hollow bit body (201).

6. A method of gas-preserved coring of soft coal seams by breaking, characterized in that, The soft coal seam gas dynamic sealing coring device is realized by the method, and comprises the following steps: Step 1: connecting the adapter (3) with the coring drill rod, drilling the soft coal seam gas dynamic sealing coring device from the orifice to the preset coring point, and keeping the sealing ball valve (15) open during the drilling process; Step 2: putting the sealing ball (5) into the coring drill rod, injecting high-pressure gas into the coring drill rod to press, and making the locking mechanism core pipe (6) descend under the pushing of the sealing ball (5), moving the unlocking groove to the position of the locking ball (13), and making the bottom end of the locking ball (13) enter the unlocking groove (1001); separating the locking sliding sleeve (10) from the force storage mechanism main pipe (7), making the locking sliding sleeve (10) descend under the pushing of the force storage spring (12), and driving the pushing cylinder (11) to descend, rotating the sealing knob (151), and closing the sealing ball valve (15); Step 3: sequentially withdrawing all the drill tools in the hole, taking out the coring inner cylinder (9), and completing the sealed coring. Step 3: sequentially withdrawing all the drill tools in the hole, taking out the coring inner cylinder (9), and completing the sealed coring.

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