Rope traction single-wall closed coring device and method

Abstract

The invention discloses a rope traction single-wall closed coring device and method.According to the closed coring device, an upper positioning rotating rod and a lower positioning rotating rod are arranged at the upper end and the lower end of a ball core correspondingly and matched with an upper mounting groove and a lower mounting groove correspondingly, a first traction rope is arranged in the upper mounting groove, and a second traction rope is arranged in the lower mounting groove; a second traction rope is arranged in the lower mounting groove, the right end of the first traction rope is connected with the upper end of an upper positioning rotating rod, the left end of the first traction rope penetrates through a first through hole to be connected with the right upper end of a pressure-bearing sliding block, and the right end of the second traction rope is connected with the lower end of a lower positioning rotating rod; the left end of the second traction rope penetrates through the second through hole to be connected with the right lower end of the pressure-bearing sliding block, an original three-layer closed coring structure is simplified, the overall weight of the coring device is reduced, the diameter of a center hole of a ball core is increased, and the coring block rate and the sampling weight are increased. By means of the corresponding closed coring structure, the complex structure for achieving closed coring through an existing three-layer coring pipe is simplified, and single-wall closed coring is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of closed coring, and in particular relates to a rope-pulled single-wall closed coring device and method. Background Art

[0002] As the depth of coal mining continues to increase, the threat of coal and gas outburst disasters in mines has become increasingly severe. Accurately measuring the gas content in coal seams is an important technical means to assess whether coal seams can be excavated and mined. Existing methods for testing the gas content in coal seams are mainly divided into two types: (1) indirect method for measuring gas content and (2) direct method for measuring gas content. Since the geological conditions of coal seams are difficult to accurately replicate, the results of indirect methods for measuring the gas content in coal seams generally have large errors. Therefore, most coal mining companies use the direct method to measure the gas content in coal seams. They directly calculate the gas content in coal seams by drilling gas-containing samples, desorbing them on site, and conducting laboratory tests. The key lies in on-site sampling.

[0003] The existing coal seam fixed-point sampling and gas content determination generally adopts an open core tube, but the gas escapes too much during the drilling process, resulting in low accuracy of gas content determination. At present, although some scholars and engineers have invented a series of closed coring devices, which mainly include a coring outer tube, a coring inner tube, a driving tube and other structures, including at least a three-layer structure, this increases the overall weight of the coring device on the one hand, and limits the through-hole diameter of the spherical core on the other hand, which is not conducive to taking out block coal samples and taking out more coal samples. Therefore, there is a need for a rope-pulled single-walled closed coring device and method that is simple in structure and convenient for closed coring. Summary of the invention

[0004] The purpose of the present invention is to provide a rope-pulled single-wall closed coring device and method with a simple structure and convenient closed coring. By changing the existing structure, the closed coring operation can be achieved through a layer of tube, which not only reduces the weight of the coring device, but also greatly increases the diameter of the spherical core center hole, improves the sampling block rate and sampling weight.

[0005] To achieve the above object, the present invention adopts the following technical solution: A rope-pulled single-wall closed coring device comprises a drill rod body, a pressure-bearing slider, a recovery ring, a front sealing pad, a rear sealing pad, a ball core, an upper positioning rotating rod, a lower positioning rotating rod, a coring drill bit, a partition plate, and a gas measuring nozzle; the coring drill bit is installed at the right end of the drill rod body, the partition plate is arranged inside the drill rod body so that the internal cavity of the drill rod body forms a slider driving cabin located at the left end of the partition plate and a closed coring cabin located at the right end of the partition plate, the ball core is arranged at the right end of the closed coring cabin, the front sealing pad is arranged on the left side of the ball core, the rear sealing pad is arranged on the right side of the ball core, a middle hole that passes through the left and right sides is opened on the ball core, a first mounting groove is arranged at the upper end of the ball core, a second mounting groove is arranged at the lower end of the ball core, an upper positioning rotating rod is installed in the first mounting groove, a lower positioning rotating rod is installed in the second mounting groove, the lower end of the upper positioning rotating rod is fixedly connected to the ball core, the upper end of the lower positioning rotating rod is fixedly connected to the ball core, the pressure-bearing slider is arranged in the slider driving cabin, and the recovery ring is arranged at the left end of the pressure-bearing slider; The screw threaded hole is provided with a first threaded hole at the left end of the upper mounting groove, and a second threaded hole is provided at the right end of the upper mounting groove. The first through hole is provided on the right side of the first threaded hole, and the third threaded hole is provided on the left side of the lower mounting groove. The fourth threaded hole is provided on the right side of the lower mounting groove. The second through hole is provided on the right side of the third threaded hole. The first traction rope is installed in the upper mounting groove, and the right end of the first traction rope is connected to the upper end of the upper positioning rotating rod, and the left end of the first traction rope passes through the first through hole and is connected to the right upper end of the pressure-bearing sliding block. The second traction rope is installed in the lower mounting groove, and the right end of the second traction rope is connected to the lower end of the lower positioning rotating rod, and the left end of the second traction rope passes through the second through hole and is connected to the right lower end of the pressure-bearing sliding block.

[0006] The outer surface of the drill rod body is provided with an upper outer cover plate corresponding to the upper mounting groove and a lower outer cover plate corresponding to the lower mounting groove. The upper outer cover plate is consistent in shape with the upper mounting groove, and the lower outer cover plate is consistent in shape with the lower mounting groove. The left end of the upper outer cover plate is provided with a fifth threaded hole corresponding to the first threaded hole, the right end of the upper outer cover plate is provided with a sixth threaded hole corresponding to the second threaded hole, the left end of the lower outer cover plate is provided with a seventh threaded hole corresponding to the third threaded hole, and the right end of the lower outer cover plate is provided with an eighth threaded hole corresponding to the fourth threaded hole.

[0007] A first rotating block is disposed on the upper portion of the upper positioning rotating rod, a second rotating block is disposed on the lower portion of the lower positioning rotating rod, the first traction rope is connected to the upper end of the positioning rotating rod through the first rotating block, and the second traction rope is connected to the lower end of the positioning rotating rod through the second rotating block; A fan-shaped cutting groove extending downward is provided in the upper mounting groove through the upper end of the upper positioning rotating rod and in the lower mounting groove through the lower end of the lower positioning rotating rod. The upper outer cover plate and the lower outer cover plate are provided with corresponding fan-shaped cover plate parts at the corresponding positions of the upper mounting groove and the lower mounting groove, so that the rotation range of the upper positioning rotating rod and the lower positioning rotating rod is limited to the fan-shaped cutting groove and the fan-shaped cover plate part.

[0008] A protruding rod body is provided at the right end of the drill rod body, the outer diameter of the protruding rod body is smaller than the outer diameter of the drill rod body, so that a first step portion is formed between the protruding rod body and the drill rod body, and an external thread portion is provided on the outer surface of the protruding rod body; The core drill bit includes a drill body and a mounting portion arranged at the left end of the drill body, the mounting portion includes an outer rod portion, an inner rod portion and a deep groove portion formed between the outer rod portion and the inner rod portion, the upper surface of the deep groove portion is provided with an internal thread portion corresponding to the external thread portion, when installing, the protruding rod body is inserted into the deep groove portion by screwing the core drill bit, and the left end of the outer rod portion is supported on the first step portion.

[0009] The left end of the front sealing gasket is provided with an annular boss, and the outer surface of the annular boss is provided on the inner wall of the drill rod body; A pressing block is arranged at the right end of the rear sealing pad, a second step portion is arranged on the pressing block, and the left end of the inner rod portion is supported on the second step portion.

[0010] An upper circular groove is provided on the inner side of the right end of the upper outer cover plate, and a lower circular groove is provided on the inner side of the right end of the lower outer cover plate. The upper end of the upper positioning rotating rod is inserted in the upper circular groove, and the lower end of the lower positioning rotating rod is inserted in the lower circular groove. The diameters of the upper circular groove and the lower circular groove are larger than the diameters of the upper positioning rotating rod and the lower positioning rotating rod, and the central axes of the upper circular groove and the lower circular groove are perpendicular to the central axis of the drill rod body.

[0011] The gas measuring nozzle is arranged on the drill rod body of the closed coring chamber.

[0012] The rope-pulled single-walled closed coring method is implemented based on the rope-pulled single-walled closed coring device, and comprises the following steps: (1) Assemble the rope-pulled single-wall closed coring device; (2) Install the assembled rope-pulled single-wall closed coring device on the drill pipe of the crawler drilling rig; (3) Rotary cutting of the coal body at the bottom of the hole for sampling; (4) High-pressure water is injected into the drill pipe, and the high-pressure water impacts the pressure-bearing slider through the inner hole of the drill pipe; (5) Stop injecting high-pressure water, withdraw the drill, and remove the closed coring device from the drill pipe; (6) Connect the on-site desorption instrument to the gas measuring nozzle through a needle to perform on-site desorption; (7) Remove the upper outer cover plate and the lower outer cover plate, use a wrench to screw the upper positioning rotating rod or the lower positioning rotating rod to open the closed ball core, pour out the coal sample in the closed coring device and put it into the coal sample tank, and bring it back to the ground laboratory for testing.

[0013] The specific operation process of step (1) is as follows: screw the first bolt into the first threaded hole and the fifth threaded hole, screw the second bolt into the second threaded hole and the sixth threaded hole to complete the installation of the upper outer cover plate, screw the third bolt into the third threaded hole and the seventh threaded hole, screw the fourth bolt into the fourth threaded hole and the eighth threaded hole to complete the installation of the lower outer cover plate; then screw the coring drill bit so that the raised rod body is inserted into the deep groove portion, the left end of the outer rod portion is supported on the first step portion, and the left end of the inner rod portion is supported on the second step portion, thereby completing the installation of the rope-pulled single-wall closed coring device; The specific process of step (2) is as follows: a mounting portion for connecting the drill rod is provided at the left end of the drill rod body, and the assembled coring device is mounted on the drilling rig through the mounting portion.

[0014] The specific operation process of step (3) is as follows: start the drilling rig, the drilling rig drives the drill rod to rotate, and then drives the drill rod body and the coring drill bit to perform rotary cutting sampling, and the rotary cut coal sample passes through the coring drill bit and the middle hole of the ball core into the closed coring chamber; The specific operation process of step (4) is as follows: the pressure-bearing slider moves to the right under the impact of high-pressure water. During the movement, the pressure-bearing slider drives the first traction rope and the second traction rope to respectively pull the first rotating block and the second rotating block, thereby driving the rotation of the upper positioning rotating rod and the lower positioning rotating rod, driving the rotation of the ball core, and the left and right transparent middle hole of the ball core rotates 90°, so that the ball core blocks the channel between the closed coring chamber and the inner hole of the coring drill bit, thereby achieving the sealing of the closed coring chamber.

[0015] The present application is provided with an upper positioning rotating rod at the upper end of the ball core, and a lower positioning rotating rod at the lower end, and cooperates with the corresponding upper mounting groove and lower mounting groove, a first traction rope is provided in the upper mounting groove, and a second traction rope is provided in the lower mounting groove, so that the right end of the first traction rope is connected to the upper end of the upper positioning rotating rod, the left end of the first traction rope passes through the first through hole to connect to the upper right end of the pressure-bearing slider, the right end of the second traction rope is connected to the lower end of the lower positioning rotating rod, and the left end of the second traction rope passes through the second through hole to connect to the lower right end of the pressure-bearing slider. Thus, single-wall closed coring is realized, the original three-layer closed coring structure is simplified, not only the overall weight of the coring device is reduced, but also the diameter of the hole in the ball core is greatly increased, and the coring block rate and sampling weight are improved.

[0016] To sum up, the present application is scientifically designed and reasonably structured. It simplifies the complex structure of the existing three-layer coring tube to achieve closed coring through the corresponding closed coring structure, realizes single-wall closed coring, and solves the technical problems of the existing coring device having a complex structure, large overall weight, high cost, being unfavorable for removing block coal samples, and having a small weight of the removed coal samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a cross-sectional view of the rope-pulled single-wall closed coring device of the present application.

[0018] FIG. 2 is an enlarged view of portion A in FIG. 1 .

[0019] Figure 3 yes Figure 1 Enlarged view of part B in the middle.

[0020] Figure 4 Figure 1 Enlarged view of part C in the middle.

[0021] FIG. 5 is a top view of the rope-pulled single-wall closed coring device of the present application.

[0022] FIG. 6 is a schematic diagram of the structure of the upper surface cover plate of the present application. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0024] Embodiment 1 like Figure 1-6 As shown, a rope-pulled single-wall closed coring device comprises a drill rod body 1, a pressure-bearing slider 2, a recovery ring 3, a front sealing pad 4, a rear sealing pad 5, a ball core 6, an upper positioning rotating rod 7, a lower positioning rotating rod 39, a coring drill bit 8, a partition plate 9, and a gas measuring nozzle 10; the coring drill bit 8 is installed at the right end of the drill rod body 1, and the partition plate 9 is arranged inside the drill rod body 1 so that the inner cavity of the drill rod body 1 forms a slider driving chamber 31 located at the left end of the partition plate 9 and a closed coring chamber 30 located at the right end of the partition plate 9, and the ball core 6 is arranged at the right end of the closed coring chamber 30 , the front sealing gasket 4 is arranged on the left side of the ball core 6, the rear sealing gasket 5 is arranged on the right side of the ball core 6, the ball core 6 is provided with a central hole which passes through the left and right sides, the upper end of the ball core 6 is provided with a first mounting groove, the lower end of the ball core 6 is provided with a second mounting groove, an upper positioning rotating rod 7 is installed in the first mounting groove, a lower positioning rotating rod 39 is installed in the second mounting groove, the lower end of the upper positioning rotating rod 7 is fixedly connected to the ball core 6, the upper end of the lower positioning rotating rod 39 is fixedly connected to the ball core 6, the pressure-bearing slider 2 is installed in the slider driving chamber 31, and the recovery ring 3 is installed at the left end of the pressure-bearing slider 2; The upper and lower sides of the drill rod body 1 are respectively provided with an upper mounting groove 11 and a lower mounting groove 12, the left end of the upper mounting groove 11 is provided with a first threaded hole 15 inside the drill rod body 1, the right end of the upper mounting groove 11 is provided with a second threaded hole 16 inside the drill rod body 1, the right side of the first threaded hole 15 is provided with a first through hole 13 opened inside the drill rod body 1, the left end of the lower mounting groove 12 is provided with a third threaded hole inside the drill rod body 1, and the right end of the lower mounting groove 12 is provided with a fourth threaded hole inside the drill rod body 1. A hole is provided in the drill rod body 1 on the right side of the third threaded hole, a second through hole 14 is opened inside the drill rod body 1, a first traction rope 19 is installed in the upper mounting groove 11, the right end of the first traction rope 19 is connected to the upper end of the upper positioning rotating rod 7, the left end of the first traction rope 19 passes through the first through hole 13 and is connected to the right upper end of the pressure sliding block 2, a second traction rope 20 is installed in the lower mounting groove 12, the right end of the second traction rope 20 is connected to the lower end of the lower positioning rotating rod 39, and the left end of the second traction rope 20 passes through the second through hole 14 and is connected to the right lower end of the pressure sliding block 2.

[0025] The outer surface of the drill rod body 1 is provided with an upper outer cover plate 28 corresponding to the upper mounting groove 11 and a lower outer cover plate 29 corresponding to the lower mounting groove 12. The upper outer cover plate 28 has the same shape as the upper mounting groove 11, and the lower outer cover plate 29 has the same shape as the lower mounting groove 12. The left end of the upper outer cover plate 28 is provided with a fifth threaded hole 17 corresponding to the first threaded hole 15, the right end of the upper outer cover plate 28 is provided with a sixth threaded hole 18 corresponding to the second threaded hole 16, the left end of the lower outer cover plate 29 is provided with a seventh threaded hole corresponding to the third threaded hole, and the right end of the lower outer cover plate 29 is provided with an eighth threaded hole corresponding to the fourth threaded hole.

[0026] A first rotating block 21 is disposed at the upper portion of the upper positioning rotating rod 7, a second rotating block 22 is disposed at the lower portion of the lower positioning rotating rod 39, the first traction rope 19 is connected to the upper end of the upper positioning rotating rod 7 via the first rotating block 21, and the second traction rope 20 is connected to the lower end of the lower positioning rotating rod 39 via the second rotating block 22; The upper mounting groove 11 is provided with a downwardly extending fan-shaped cutting groove 23 at a position passing through the upper end of the upper positioning rotating rod 7 and the lower mounting groove 12 is provided with a position passing through the lower end of the lower positioning rotating rod 39. The upper outer cover plate 28 and the lower outer cover plate 29 are provided with corresponding fan-shaped cover plate portions 24 at the corresponding positions of the upper mounting groove 11 and the lower mounting groove 12, so that the rotation range of the upper positioning rotating rod 7 and the lower positioning rotating rod 39 is limited to the fan-shaped cutting groove 23 and the fan-shaped cover plate portion 24. The angle of the fan-shaped cutting groove 23 and the fan-shaped cover plate portion 24 is 90°, thereby ensuring that the upper positioning rotating rod 7 and the lower positioning rotating rod 39 rotate 90° under the action of the traction rope. There is a large friction force between the outer circle and end surface of the upper end of the upper positioning rotating rod 7 and the lower end of the lower positioning rotating rod 39 and the inner wall of the upper mounting groove 11 and the upper outer cover plate 28 and the lower mounting groove 12 and the lower outer cover plate 29 respectively. When rotating with the core drill bit, if there is no rope traction, the upper positioning rotating rod 7 and the lower positioning rotating rod 39 will not rotate.

[0027] The right end of the drill rod body 1 is provided with a protruding rod body 25, the outer diameter of the protruding rod body 25 is smaller than the outer diameter of the drill rod body 1, so that a first step portion 26 is formed between the protruding rod body 25 and the drill rod body 1, and the outer surface of the protruding rod body 25 is provided with an external threaded portion; The coring drill bit 8 includes a drill body and a mounting portion arranged at the left end of the drill body, the mounting portion includes an outer rod portion, an inner rod portion and a deep groove portion formed between the outer rod portion and the inner rod portion, the upper surface of the deep groove portion is provided with an inner thread portion corresponding to the outer thread portion, during installation, the coring drill bit 8 is screwed so that the protruding rod body 25 is inserted into the deep groove portion, and the left end of the outer rod portion is supported on the first step portion 26.

[0028] The left end of the front sealing gasket 4 is provided with an annular boss 38, and the outer surface of the annular boss 38 is provided on the inner wall of the drill rod body 1; A clamping block 36 is provided at the right end of the rear sealing gasket 5 , and a second step portion 27 is provided on the clamping block 36 . The left end of the inner rod portion is supported on the second step portion 27 . The drill bit tightens and squeezes the clamping block 36 to compress the ball core 6 .

[0029] An upper circular groove 37 is provided on the inner side of the right end of the upper outer cover plate 28, and a lower circular groove is provided on the inner side of the right end of the lower outer cover plate 29. The upper end of the upper positioning rotating rod 7 is inserted into the upper circular groove 37, and the lower end of the lower positioning rotating rod 39 is inserted into the lower circular groove. The diameters of the upper circular groove 37 and the lower circular groove are larger than the diameters of the upper positioning rotating rod 7 and the lower positioning rotating rod 39. The central axes of the upper circular groove 37 and the lower circular groove are perpendicular to the central axis of the drill rod body 1 to ensure that the ball core 6 can be smoothly opened and closed. The first rotating block 21 is restricted by the fan-shaped cutting groove 23, and the second rotating block 22 is restricted by the fan-shaped cover plate portion 24. Since the fan-shaped cutting groove 23 and the fan-shaped cover plate portion 24 have the same structure and their arcs are both 90°, the first rotating block 21 and the second rotating block 22 can only rotate 90°.

[0030] The gas measuring nozzle 10 is arranged on the drill rod body 1 of the closed coring chamber 30. The gas measuring nozzle 10 is a one-way gas measuring hole. By inserting a gas needle, on-site desorption can be performed to measure the gas content in the coring device.

[0031] Embodiment 2 The rope-pulled single-walled closed coring method is implemented based on the rope-pulled single-walled closed coring device, and comprises the following steps: (1) Assembling the rope-pulled single-walled closed coring device, specifically, screwing the first bolt 32 into the first threaded hole 15 and the fifth threaded hole 17, screwing the second bolt 33 into the second threaded hole 16 and the sixth threaded hole 18, completing the installation of the upper outer cover plate 28, screwing the third bolt 34 into the third threaded hole and the seventh threaded hole, screwing the fourth bolt 35 into the fourth threaded hole and the eighth threaded hole, completing the installation of the lower outer cover plate 29; then screwing the coring drill bit 8 so that the protruding rod body 25 is inserted into the deep groove portion, the left end of the outer rod portion is supported on the first step portion 26, and the left end of the inner rod portion is supported on the second step portion 27, completing the assembly of the rope-pulled single-walled closed coring device; (2) Installing the assembled rope-pulled single-wall closed coring device on the drill rod of the crawler drilling rig. Specifically, a mounting portion for connecting the drill rod is provided at the left end of the drill rod body 1, and the assembled coring device is installed on the drilling rig through the mounting portion; (3) Rotary cutting of the coal body at the bottom of the hole for sampling. Specifically, the drilling rig is started, and the drilling rig drives the drill rod to rotate, thereby driving the drill rod body 1 and the coring drill bit 8 to perform rotary cutting for sampling. The rotary cut coal sample passes through the coring drill bit 8 and the middle hole of the ball core 6 into the closed coring chamber 30; (4) High-pressure water is injected into the drill pipe. The high-pressure water impacts the pressure-bearing slider 2 through the inner hole of the drill pipe. The pressure-bearing slider 2 moves to the right under the impact of the high-pressure water. During the movement, the pressure-bearing slider 2 drives the first traction rope 19 and the second traction rope 20 to respectively pull the first rotating block 21 and the second rotating block 22, thereby driving the rotation of the upper positioning rotating rod 7 and the lower positioning rotating rod 39, and driving the rotation of the ball core 6. The left and right transparent middle hole of the ball core 6 rotates 90 degrees, so that the ball core blocks the channel between the closed coring chamber 30 and the inner hole of the coring drill bit 8, thereby achieving the sealing of the closed coring chamber 30; (5) Stop injecting high-pressure water, withdraw the drill, and remove the closed coring device from the drill pipe; (6) Connecting the on-site desorption instrument to the gas measuring nozzle 10 via a needle to perform on-site desorption; (7) After desorption is completed, remove the upper outer cover plate 28 and the lower outer cover plate 29, use a wrench to twist the positioning rotating rod 7, and then open the closed ball core 6, pour out the coal sample in the closed coring device and put it into the coal sample tank, and take it back to the ground laboratory for testing. After coring is completed once, pull the recovery ring 3 at the left end of the pressure-bearing slide 2 to return the pressure-bearing slide 2 to its original position for the next coring.

[0032] The present application is provided with an upper positioning rotating rod 7 at the upper end of the ball core 6, and a lower positioning rotating rod 39 at the lower end, and cooperates with the corresponding upper mounting groove 11 and lower mounting groove 12, a first traction rope 19 is provided in the upper mounting groove 11, and a second traction rope 20 is provided in the lower mounting groove 12, so that the right end of the first traction rope 19 is connected to the upper end of the lower positioning rotating rod 39, the left end of the first traction rope 19 passes through the first through hole 13 to connect to the upper right end of the pressure-bearing slider 2, the right end of the second traction rope 20 is connected to the lower end of the positioning rotating rod 7, and the left end of the second traction rope 20 passes through the second through hole 14 to connect to the lower right end of the pressure-bearing slider 2. Thus, single-wall closed coring is realized, the original three-layer closed coring structure is simplified, not only the overall weight of the coring device is reduced, but also the diameter of the hole in the ball core 6 is greatly increased, and the coring block rate and sampling weight are improved. The present application is scientifically designed and reasonably structured. It simplifies the complex structure of the existing three-layer coring tube to achieve closed coring through the corresponding closed coring structure, realizes single-wall closed coring, and solves the technical problems of the existing coring device having a complex structure, a large overall weight, a high cost, being unfavorable for taking out block coal samples, and having a small weight of the taken out coal samples.

[0033] 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. Rope-pulled single-wall closed coring device, characterized by: The drill bit is installed on the right end of the drill rod body, the partition plate is arranged inside the drill rod body so that the internal cavity of the drill rod body forms a slider driving cabin located at the left end of the partition plate and a closed coring cabin located at the right end of the partition plate, the ball core is arranged at the right end of the closed coring cabin, the front sealing gasket is arranged on the left side of the ball core, the rear sealing gasket is arranged on the right side of the ball core, a middle hole which passes through the left and right sides is opened on the ball core, a first mounting groove is arranged on the upper end of the ball core, a second mounting groove is arranged on the lower end of the ball core, an upper positioning rotating rod is installed in the first mounting groove, a lower positioning rotating rod is installed in the second mounting groove, the lower end of the upper positioning rotating rod is fixedly connected to the ball core, the upper end of the lower positioning rotating rod is fixedly connected to the ball core, the pressure-bearing slider is arranged in the slider driving cabin, and the recovery ring is arranged on the left end of the pressure-bearing slider; The screw threaded hole is provided with a first threaded hole at the left end of the upper mounting groove, and a second threaded hole is provided at the right end of the upper mounting groove. The first through hole is provided on the right side of the first threaded hole, and the third threaded hole is provided on the left side of the lower mounting groove. The fourth threaded hole is provided on the right side of the lower mounting groove. The second through hole is provided on the right side of the third threaded hole. The first traction rope is installed in the upper mounting groove, and the right end of the first traction rope is connected to the upper end of the upper positioning rotating rod, and the left end of the first traction rope passes through the first through hole and is connected to the right upper end of the pressure-bearing sliding block. The second traction rope is installed in the lower mounting groove, and the right end of the second traction rope is connected to the lower end of the lower positioning rotating rod, and the left end of the second traction rope passes through the second through hole and is connected to the right lower end of the pressure-bearing sliding block.

2. The rope-pulled single-wall closed coring device according to claim 1, characterized in that: The outer surface of the drill rod body is provided with an upper outer cover plate corresponding to the upper mounting groove and a lower outer cover plate corresponding to the lower mounting groove. The upper outer cover plate is consistent in shape with the upper mounting groove, and the lower outer cover plate is consistent in shape with the lower mounting groove. The left end of the upper outer cover plate is provided with a fifth threaded hole corresponding to the first threaded hole, the right end of the upper outer cover plate is provided with a sixth threaded hole corresponding to the second threaded hole, the left end of the lower outer cover plate is provided with a seventh threaded hole corresponding to the third threaded hole, and the right end of the lower outer cover plate is provided with an eighth threaded hole corresponding to the fourth threaded hole.

3. The rope-pulled single-wall closed coring device according to claim 2, characterized in that: A first rotating block is disposed on the upper portion of the upper positioning rotating rod, a second rotating block is disposed on the lower portion of the lower positioning rotating rod, the first traction rope is connected to the upper end of the positioning rotating rod through the first rotating block, and the second traction rope is connected to the lower end of the positioning rotating rod through the second rotating block; A fan-shaped cutting groove extending downward is provided in the upper mounting groove through the upper end of the upper positioning rotating rod and in the lower mounting groove through the lower end of the lower positioning rotating rod. The upper outer cover plate and the lower outer cover plate are provided with corresponding fan-shaped cover plate parts at the corresponding positions of the upper mounting groove and the lower mounting groove, so that the rotation range of the upper positioning rotating rod and the lower positioning rotating rod is limited to the fan-shaped cutting groove and the fan-shaped cover plate part.

4. The rope-pulled single-wall closed coring device according to claim 3 is characterized in that: A protruding rod body is provided at the right end of the drill rod body, the outer diameter of the protruding rod body is smaller than the outer diameter of the drill rod body, so that a first step portion is formed between the protruding rod body and the drill rod body, and an external thread portion is provided on the outer surface of the protruding rod body; The core drill bit includes a drill body and a mounting portion arranged at the left end of the drill body, the mounting portion includes an outer rod portion, an inner rod portion and a deep groove portion formed between the outer rod portion and the inner rod portion, the upper surface of the deep groove portion is provided with an internal thread portion corresponding to the external thread portion, when installing, the protruding rod body is inserted into the deep groove portion by screwing the core drill bit, and the left end of the outer rod portion is supported on the first step portion.

5. The rope-pulled single-wall closed coring device according to claim 4, characterized in that: The left end of the front sealing gasket is provided with an annular boss, and the outer surface of the annular boss is provided on the inner wall of the drill rod body; A pressing block is arranged at the right end of the rear sealing pad, a second step portion is arranged on the pressing block, and the left end of the inner rod portion is supported on the second step portion.

6. The rope-pulled single-wall closed coring device according to claim 5, characterized in that: An upper circular groove is provided on the inner side of the right end of the upper outer cover plate, and a lower circular groove is provided on the inner side of the right end of the lower outer cover plate. The upper end of the upper positioning rotating rod is inserted in the upper circular groove, and the lower end of the lower positioning rotating rod is inserted in the lower circular groove. The diameters of the upper circular groove and the lower circular groove are larger than the diameters of the upper positioning rotating rod and the lower positioning rotating rod, and the central axes of the upper circular groove and the lower circular groove are perpendicular to the central axis of the drill rod body.

7. The rope-pulled single-wall closed coring device according to claim 6, characterized in that: The gas measuring nozzle is arranged on the drill rod body of the closed coring chamber.

8. A rope-pulled single-walled closed coring method, implemented based on the rope-pulled single-walled closed coring device as claimed in any one of claims 1 to 7, characterized in that: The steps include: (1) Assemble the rope-pulled single-wall closed coring device; (2) Install the assembled rope-pulled single-wall closed coring device on the drill pipe of the crawler drilling rig; (3) Rotary cutting of the coal body at the bottom of the hole for sampling; (4) High-pressure water is injected into the drill pipe, and the high-pressure water impacts the pressure-bearing slider through the inner hole of the drill pipe; (5) Stop injecting high-pressure water, withdraw the drill, and remove the closed coring device from the drill pipe; (6) Connect the on-site desorption instrument to the gas measuring nozzle through a needle to perform on-site desorption; (7) Remove the upper outer cover plate and the lower outer cover plate, use a wrench to screw the upper positioning rotating rod or the lower positioning rotating rod to open the closed ball core, pour out the coal sample in the closed coring device and put it into the coal sample tank, and bring it back to the ground laboratory for testing.

9. The rope-pulling single-wall closed coring method according to claim 8, characterized in that: The specific operation process of step (1) is as follows: screw the first bolt into the first threaded hole and the fifth threaded hole, screw the second bolt into the second threaded hole and the sixth threaded hole to complete the installation of the upper outer cover plate, screw the third bolt into the third threaded hole and the seventh threaded hole, screw the fourth bolt into the fourth threaded hole and the eighth threaded hole to complete the installation of the lower outer cover plate; then screw the coring drill bit so that the raised rod body is inserted into the deep groove portion, the left end of the outer rod portion is supported on the first step portion, and the left end of the inner rod portion is supported on the second step portion, thereby completing the installation of the rope-pulled single-wall closed coring device; The specific process of step (2) is as follows: a mounting portion for connecting the drill rod is provided at the left end of the drill rod body, and the assembled coring device is mounted on the drilling rig through the mounting portion.

10. The rope-pulling single-wall closed coring method according to claim 8, characterized in that: The specific operation process of step (3) is as follows: start the drilling rig, the drilling rig drives the drill rod to rotate, and then drives the drill rod body and the coring drill bit to perform rotary cutting sampling, and the rotary cut coal sample passes through the coring drill bit and the middle hole of the ball core into the closed coring chamber; The specific operation process of step (4) is as follows: the pressure-bearing slider moves to the right under the impact of high-pressure water. During the movement, the pressure-bearing slider drives the first traction rope and the second traction rope to respectively pull the first rotating block and the second rotating block, thereby driving the rotation of the upper positioning rotating rod and the lower positioning rotating rod, driving the rotation of the ball core, and the left and right transparent middle hole of the ball core rotates 90°, so that the ball core blocks the channel between the closed coring chamber and the inner hole of the coring drill bit, thereby achieving the sealing of the closed coring chamber.

Images