Single-wall type closed sampler, manufacturing process and sampling method
By using a single-walled sealed sampler with a single-layer tube structure and an inner top rod type ball core closure design, the problem of large gas desorption and emission in existing devices has been solved, achieving both high accuracy in gas content determination and ease of operation.
Patent Information
- Application Number
- CN202511177400.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-21
- Publication Date
- 2025-11-21
AI Technical Summary
In existing methods for determining coal seam gas content, the use of a core tube with one end open leads to excessive gas desorption and emission, resulting in low accuracy of the measured gas content. Furthermore, existing closed sampling devices are complex in structure, costly, and inconvenient to operate.
A single-wall sealed sampler is adopted, which is simplified to a single-layer tube structure. It adopts a ball core closure mechanism with an internal top rod design, and achieves a sealing effect through a high-low pressure conversion slide valve and a flow supply channel, which simplifies operation and improves sealing performance.
It improves the efficiency of closed sampling, reduces the complexity and cost of the device, and ensures the accuracy of gas content determination.
Smart Images
Figure CN120992270A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of core sampling technology for coal seam gas content determination. Specifically, it relates to a single-wall sealed sampler, its manufacturing process, and sampling method. Background Technology
[0002] Gas content is a crucial parameter for predicting coal and gas outburst risks, estimating coal seam gas resources, and designing mine gas control projects. Broadly speaking, there are two existing methods for determining coal seam gas content: indirect and direct methods. Because coal seam geological conditions are difficult to accurately replicate, the indirect method yields gas content estimates with significant errors. Therefore, most coal mining enterprises choose the direct method, obtaining gas-bearing coal samples through drilling, on-site desorption, and laboratory testing to directly calculate the coal seam gas content. The key to this method lies in on-site sampling. Currently, direct determination of coal seam gas content using core tubes with one open end is commonly employed. However, excessive gas desorption and escape during drill retraction leads to low accuracy in the measured gas content. Furthermore, existing closed core sampling devices are complex in structure, resulting in high costs and inconvenient operation. Therefore, a simple, easy-to-operate, and well-sealed single-wall closed sampler, along with its manufacturing process and sampling method, is needed. Summary of the Invention
[0003] The purpose of this invention is to provide a single-wall sealed sampler with a simple structure, convenient operation, and good sealing effect, as well as its manufacturing process and sampling method. This invention effectively simplifies the sealed sampling device with a "three-layer tube" or "double-layer tube" structure to a "single-layer tube" structure, significantly reducing the overall weight of the device, simplifying the core extraction structure, and improving overall integrity, eliminating the need for repeated disassembly during use. Furthermore, this application adopts an internal top rod design, making the core closure more reliable and extending the reliable service life of the device, effectively solving the technical problems of existing sealed sampling devices being unable to achieve slag discharge and cooling.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: A single-walled sealed sampler includes a horizontally arranged gas sampling tube and a winged coring drill bit. The left end of the gas sampling tube is provided with a first female thread, and the right end of the gas sampling tube is provided with a first male thread. The left end of the winged coring drill bit is provided with a second female thread, and the winged coring drill bit is installed at the right end of the gas sampling tube. The gas sampling tube is equipped with a high-low pressure switching slide valve. The high-low pressure switching slide valve is located on the right side of the first female thread. The right end of the high-low pressure switching slide valve is connected to the left end of the push rod assembly. The right end of the push rod assembly is connected to the ball core assembly. The high-low pressure switching slide valve is equipped with a connecting cavity. The connecting cavity is connected to a flow supply channel. The right end of the flow supply channel passes through the wall of the gas sampling tube and connects to the outside of the gas sampling tube. The high-low pressure switching slide valve includes a horizontally arranged valve body, a reset pull ring at the left end of the valve body, a connecting cavity inside the valve body, the connecting cavity including a left cavity and a right cavity separated by a partition, a left cavity inlet at the left end of the valve body, a right cavity outlet at the right end of the valve body, a left cavity outlet connecting the left cavity and a right cavity inlet connecting the right cavity on the valve body wall, and a push rod mounting hole corresponding to the push rod assembly on the right end face of the valve body; A high-low pressure conversion sealing sleeve is installed on the valve body wall through a corresponding high-low pressure conversion sealing groove. The high-low pressure conversion sealing groove is set at the corresponding position of the left cavity outlet and the right cavity inlet, and the high-low pressure conversion sealing sleeve is provided with a left cavity hole and a right cavity hole corresponding to the left cavity outlet and the right cavity inlet. The valve body wall is also provided with a slide valve sealing groove and a slide valve shear pin hole. When the high-low pressure conversion slide valve is installed inside the gas sampling tube, a slide valve sealing gasket is installed in the slide valve sealing groove to ensure a sealed connection between the high-low pressure conversion slide valve and the gas sampling tube.
[0005] The push rod assembly includes a first push rod and a second push rod. The left ends of the first push rod and the second push rod are installed in the push rod mounting hole, and the right ends of the first push rod and the second push rod are connected to the ball core assembly. Limiting protrusions are provided on the first push rod and the second push rod. The ball core assembly includes a left ball core seat and a ball core. The ball core is installed on the right side of the left ball core seat. The left ball core seat includes a first cylinder arranged on the left and right. The first cylinder has a first channel that connects the left and right sides. The first channel includes a flared section with a gradually decreasing diameter from left to right and a section with the same diameter. The body wall of the first cylinder has a through hole corresponding to the first push rod and the second push rod. The body wall of the first cylinder has a limiting platform corresponding to the limiting protrusion. The right end of the first cylinder has a first step. The left ball core seat and the ball core are connected by a first polytetrafluoroethylene gasket provided on the first step. The body wall of the first cylinder has a first fixing pin hole arranged radially. The sphere core includes a sphere with a through hole that runs horizontally through it and is coaxial with the gas sampling tube. The sphere has an upper plane and a lower plane that are opposite each other. A first cylindrical boss is provided at the center of the upper plane, and a second cylindrical boss is provided at the center of the lower plane. A fixing shaft hole is provided on the first cylindrical boss, and a reset shaft hole is provided on the second cylindrical boss. A first rotating plate is provided between the first cylindrical boss and the upper plane, and a second rotating plate is provided between the second cylindrical boss and the lower plane. The right end of the first push rod is in close contact with the first rotating plate, and the right end of the second push rod is in close contact with the second rotating plate.
[0006] A right ball core seat is provided on the right side of the ball core. The right ball core seat includes a second cylinder arranged on the left and right. The second cylinder has a second channel that runs through it from left to right. An extension plate is provided on the left end of the second cylinder along the circumference. A second step is provided on the left end of the second cylinder. The right ball core seat and the ball core are connected by a second polytetrafluoroethylene gasket provided on the second step. A compression sealing sleeve is fitted on the second cylinder. The compression sealing sleeve includes a straight section on the left and a contracted section on the right.
[0007] A threaded pressure block is provided on the right side of the ball core. The threaded pressure block includes a pressure block body arranged on the left and right. The pressure block body has a pressure block through hole that runs through the left and right sides. A second step is provided at the left end of the pressure block body. The threaded pressure block and the ball core are connected by a second polytetrafluoroethylene gasket provided on the second step. The outer surface of the threaded pressure block is provided with a pressure block thread. The inner wall of the gas sampling tube is provided with an internal thread corresponding to the pressure block thread so that the threaded pressure block can be installed in the gas sampling tube by threaded connection. A pressure block disassembly port is provided on the right end face of the pressure block body so that the threaded pressure block can be installed and disassembled by appropriate disassembly and assembly tools. At least two pressure block sealing grooves are provided on the pressure block body, and a pressure block sealing ring is provided in the pressure block sealing groove.
[0008] The right end of the high-low pressure switching slide valve is connected to a flow divider tee through the right cavity outlet. The flow divider tee is connected to the first supply pipe and the second supply pipe. There are two supply channels, which are respectively set in the first supply pipe and the second supply pipe. The right ends of the first supply pipe and the second supply pipe are connected to the inclined water outlet set on the gas sampling pipe through the supply elbow, thereby connecting to the outside of the gas sampling pipe. The first supply pipe, the second supply pipe, the first push rod and the second push rod are all set on the support frame. The support frame includes a circular frame, on which are provided a first supply hole corresponding to the first supply pipe, a second supply hole corresponding to the second supply pipe, a first rod hole corresponding to the first push rod, and a second rod hole corresponding to the second push rod; The outer surface of the gas sampling tube is provided with a spiral groove or spiral rib. The tube wall is provided with a gas sampling hole, a first shear pin hole and a second shear pin hole corresponding to the high and low pressure conversion slide valve, a second fixing pin hole corresponding to the first fixing pin hole on the left ball core seat, an oblique outlet corresponding to the outlet end of the supply channel, a first rotating shaft hole corresponding to the fixing rotating shaft hole on the ball core and a second rotating shaft hole corresponding to the reset rotating shaft hole on the ball core. The inner wall of the gas sampling tube is provided with a high and low pressure conversion groove, which is located at a position corresponding to the outlet of the left cavity and the inlet of the right cavity.
[0009] There are two flow channels. Both flow channels are set inside the pipe wall of the gas sampling tube to form corresponding pipe wall flow holes. The left end of the pipe wall flow hole is connected to the left cavity. The right cavity inlet and right cavity outlet of the high-low pressure conversion slide valve are equipped with plugs. The outer surface of the gas sampling tube is provided with a spiral groove or spiral rib. The tube wall of the gas sampling tube is provided with a gas sampling hole, a first shear pin hole and a second shear pin hole corresponding to the high and low pressure conversion slide valve, a second fixing pin hole corresponding to the first fixing pin hole on the left ball core seat, an oblique water outlet corresponding to the outlet end of the supply channel, a first rotating shaft hole corresponding to the fixing rotating shaft hole on the ball core, and a second rotating shaft hole corresponding to the reset rotating shaft hole on the ball core.
[0010] There are two supply channels, both of which are located on the outer wall supply pipe. The outer wall supply pipe is located on the outer surface of the gas sampling tube. The left end of the outer wall supply pipe is connected to the left chamber of the high-low pressure switching slide valve through the corresponding pipe wall inlet. The right chamber inlet and right chamber outlet of the high-low pressure switching slide valve are equipped with plugs. The outer surface of the gas sampling tube is provided with a spiral groove or spiral rib. The outer surface of the gas sampling tube is provided with an outer wall supply pipe groove corresponding to the outer wall supply pipe. The outer wall supply pipe is welded or fused into the outer wall supply pipe groove. The tube wall of the gas sampling tube is provided with a gas measuring hole, a first shear pin hole and a second shear pin hole corresponding to the high and low pressure conversion slide valve, a second fixing pin hole corresponding to the first fixing pin hole on the left ball core seat, an oblique water outlet corresponding to the outlet end of the supply channel, a first rotating shaft hole corresponding to the fixing rotating shaft hole on the ball core, and a second rotating shaft hole corresponding to the reset rotating shaft hole on the ball core.
[0011] The manufacturing process of a single-wall sealed sampler, wherein the single-wall sealed sampler is the aforementioned single-wall sealed sampler, includes the following steps: (1) First, machine the female thread at the left end of the gas sampling tube to form the first female thread, and machine the male thread at the right end of the gas sampling tube to form the first male thread. Then, machine the high and low pressure conversion groove on the right side of the female thread. Drill the first shear pin hole, the second shear pin hole, the gas measuring hole, the oblique water outlet, the second fixing pin hole, the first shaft hole, and the second shaft hole in sequence on the right side of the high and low pressure conversion groove. The hole positions should correspond to the positions of the components inside the tube. Then, perform fine machining on the inside of the gas sampling tube. (2) Machining the ball core, specifically drilling a through hole on the ball, and cutting out a first cylindrical boss and a second cylindrical boss, as well as a first rotating plate and a second rotating plate, that are symmetrical on the ball. Then, drilling a fixed shaft hole on the first cylindrical boss on the upper plane and drilling a reset shaft hole on the second cylindrical boss on the lower plane. (3) First, install the first push rod, the second push rod, and the diversion tee on the right side of the high-low pressure conversion slide valve. Then, connect the left ends of the first and second supply pipes to the port of the diversion tee and separate the first push rod, the second push rod, the first supply pipe, and the second supply pipe with a support frame. Then, install the high-low pressure conversion slide valve inside the gas sampling pipe and on the right side of the first female thread through the fixing pin. At the same time, connect the supply elbow to the outside of the gas sampling pipe. Next, fix the left ball core seat and the first PTFE gasket to the right side of the first and second push rods through the push screw. At the same time, make sure that the first and second push rods pass through the push rod through hole on the left ball core seat. Then, fix the left ball core seat and the first PTFE gasket to the right side of the first and second push rods through the detachable rotating shaft pin. The ball core is fixed in position with the fixed shaft pin, and the through hole of the ball core is made coaxial with the gas sampling tube. At the same time, the first rotating plate and the second rotating plate are tightly attached to the first push rod and the second push rod, respectively. Then, the right ball core seat and the compression sealing sleeve are installed on the right side of the ball core, and the right ball core seat and the ball core are connected by the second polytetrafluoroethylene gasket. Next, the inclined wing coring drill bit is installed at the right end of the gas sampling tube. The inner front seat through hole of the inclined wing coring drill bit corresponds to the right port of the second channel of the right ball core seat. During installation, the inclined wing coring drill bit and the right ball core seat cooperate with each other to act on the compression sealing sleeve, so that the compression sealing sleeve expands towards the wall of the gas sampling tube to achieve a seal. Finally, the gas measuring sealing gasket and gas measuring screw on the gas measuring hole are installed.
[0012] The manufacturing process of a single-wall sealed sampler, wherein the single-wall sealed sampler is the aforementioned single-wall sealed sampler, includes the following steps: (1) First, machine the female thread at the left end of the gas sampling tube to form the first female thread, and machine the male thread at the right end of the gas sampling tube to form the first male thread. Drill the first shear pin hole, the second shear pin hole, the gas measuring hole, the second fixing pin hole, the first shaft hole and the second shaft hole in sequence on the right side of the female thread. The hole positions should correspond to the positions of the components inside the tube. Then, perform fine machining on the inside of the gas sampling tube. (2) Cut the gas sampling tube at the right side of the female thread of the gas sampling tube. Drill a deep hole vertically to the right in the right half of the cut to make a pipe wall supply hole. Then, use friction welding to re-weld the two cut parts together. Perform tempering treatment and internal and external weld cutting on the welded parts. Drill a hole through the pipe wall of the gas sampling tube at the left end of the pipe wall supply hole to make a pipe wall inlet. Fill and weld the orifice on the outside of the gas sampling tube. Drill a hole along the pipe wall on the right side of the gas sampling tube to the right end of the pipe wall supply hole to make an oblique outlet. (3) Machining the ball core, specifically drilling a through hole on the ball, and cutting out a first cylindrical boss and a second cylindrical boss, as well as a first rotating plate and a second rotating plate, that are symmetrical on the ball. Then, drilling a fixed shaft hole on the first cylindrical boss on the upper plane and drilling a reset shaft hole on the second cylindrical boss on the lower plane. (4) First, install the first and second push rods on the right side of the high-low pressure conversion slide valve, and separate the first and second push rods with a support frame. Then, install the high-low pressure conversion slide valve inside the gas sampling tube and on the right side of the first female thread using a fixing pin. Next, fix the left ball core seat and the first PTFE gasket to the right side of the first and second push rods using a push screw, while ensuring that the first and second push rods pass through the push rod through hole on the left ball core seat. Then, fix the position of the ball core using a detachable rotating shaft pin and a fixed shaft pin, and make the ball core through hole coaxial with the gas sampling tube. The first and second rotating plates are tightly attached to the first and second push rods, respectively. Then, the right ball core seat and the compression sealing sleeve are installed on the right side of the ball core, and the right ball core seat and the ball core are connected by the second polytetrafluoroethylene gasket. Next, the inclined wing coring drill bit is installed on the right end of the gas sampling tube. The inner front seat through hole of the inclined wing coring drill bit corresponds to the right port of the second channel of the right ball core seat. During installation, the inclined wing coring drill bit and the right ball core seat cooperate with each other to act on the compression sealing sleeve, so that the compression sealing sleeve expands towards the wall of the gas sampling tube to achieve a seal. Finally, the gas measuring sealing gasket and gas measuring screw on the gas measuring hole are installed.
[0013] The closed sampling method, implemented based on the aforementioned single-wall closed sampler, includes the following steps: (1) After the sampling device is installed, it is connected to the directional drilling machine through the first female thread and the corresponding adapter; (2) Control the drilling rig to send the sealed sampler to the designated position, and then drill and sample. At the same time, gas is supplied to the left end of the sealed sampler. The gas enters the left cavity through the left cavity inlet and then flows out of the left cavity through the left cavity outlet. Then it enters the right cavity through the right cavity inlet and then enters the diversion tee through the right cavity outlet. Then it is diverted to the supply channel of the first supply pipe and the supply channel of the second supply pipe, and finally flows to the outside of the sealed sampler through the corresponding supply elbow. (3) After the sampling drilling is 0.5 to 5 meters, the air pipe at the left end is replaced with a high-pressure water pipe to continuously deliver high-pressure water into the sealed sampler. Under the action of the high-pressure water, the first and second shear pins break. The high-pressure water continues to push the high-low pressure conversion slide valve to the right. The high-low pressure conversion slide valve pushes the first and second push rods to the right. The first and second push rods push the first and second rotating plates on the ball core to rotate. When the limiting protrusion on the first push rod connects with the limiting platform on the left ball core seat, the ball core rotates 90°, so that the connecting hole of the ball core rotates from the left and right direction to the up and down direction. The left and right directions of the ball core are closed to seal the coal sample. (4) Stop the water supply and remove the sealed sampler. Insert the gas desorber into the gas measuring hole for on-site desorption. Then remove the drill bit, use the appropriate tools to return the ball core to its position, pour the coal sample into the coal sample container, and take it to the laboratory for gas content determination.
[0014] This application simplifies the structure of the original three-layer or double-layer tube closed sampling device, realizing closed sampling with a single-layer tube. The structure is simple and easy to operate. It adopts an internal top rod structure to seal the ball core, and the compressed air is discharged through the corresponding flow channel, thereby discharging slag from the closed sampling tube. This greatly improves the efficiency of closed sampling and effectively solves the technical problem of low sampling efficiency caused by the complex structure and poor sealing effect of the existing closed sampling device. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of the sealed sampler of the present invention.
[0016] Figure 2 This is a cross-sectional view of the sealed sampler of the present invention from a first perspective.
[0017] Figure 3 This is a cross-sectional view of the sealed sampler of the present invention from a second perspective.
[0018] Figure 4 This is a schematic diagram of the structure of the slanted wing coring drill bit of the present invention.
[0019] Figure 5 This is a cross-sectional view of the winged coring drill bit of the present invention.
[0020] Figure 6 This is a schematic diagram of the structure of the left ball core seat of the present invention.
[0021] Figure 7 This is a cross-sectional view of the left ball core seat of the present invention.
[0022] Figure 8 This is a cross-sectional view of the right ball core seat of the present invention.
[0023] Figure 9 This is an assembly diagram of the right ball core seat and the extrusion sealing sleeve of the present invention.
[0024] Figure 10 This is a schematic diagram of the structure of the sphere core of the present invention.
[0025] Figure 11 This is a cross-sectional view of the sphere core of the present invention.
[0026] Figure 12 This is a schematic diagram of the structure of the first and second flow supply pipes of the present invention.
[0027] Figure 13 This is a schematic diagram of the high-low pressure switching slide valve of the present invention.
[0028] Figure 14 This is a cross-sectional view of the high-low pressure switching slide valve of the present invention.
[0029] Figure 15 This is a schematic diagram of the structure of the first push rod and the second push rod of the present invention.
[0030] Figure 16 This is a schematic diagram of the support frame of the present invention.
[0031] Figure 17 This is a schematic diagram of the gas sampling tube in Embodiment 1 of the present invention.
[0032] Figure 18 This is a cross-sectional view of the gas sampling tube in Embodiment 1 of the present invention.
[0033] Figure 19 This is a cross-sectional view of the gas sampling tube in Embodiment 2 of the present invention.
[0034] Figure 20 This is a cross-sectional view of the sealed sampler in Embodiment 2 of the present invention.
[0035] Figure 21 This is a schematic diagram of the threaded pressure block of the present invention.
[0036] Figure 22 This is a cross-sectional view of the threaded pressure block of the present invention.
[0037] Figure 23 This is a schematic diagram of the structure of the threaded pressure block of the present invention installed inside the gas sampling tube.
[0038] Figure 24 This is a schematic diagram of the gas sampling tube in Embodiment 3 of the present invention.
[0039] Figure 25 This is a cross-sectional view of the gas sampling tube in Embodiment 3 of the present invention. Detailed Implementation
[0040] The embodiments of the present invention are further described below with reference to the accompanying drawings. Example 1
[0041] like Figure 1-18As shown, the single-wall sealed sampler includes a horizontally arranged gas sampling tube 2 and a slanted core drill bit 1. The left end of the gas sampling tube 2 is provided with a first female thread 208, and the right end of the gas sampling tube 2 is provided with a first male thread 207. The left end of the slanted core drill bit 1 is provided with a second female thread 107, and the slanted core drill bit 1 is installed at the right end of the gas sampling tube 2. A high-low pressure conversion slide valve 3 is installed inside the gas sampling tube 2. The high-low pressure conversion slide valve 3 is located to the right of the first female thread 208. The right end of the high-low pressure conversion slide valve 3 is connected to the left end of the push rod assembly. The right end of the push rod assembly is connected to the ball core assembly. The high-low pressure conversion slide valve 3 is provided with a connecting cavity. The connecting cavity is connected to a flow channel 5. The right end of the flow channel 5 passes through the wall of the gas sampling tube 2 and connects to the outside of the gas sampling tube 2. The inclined blade coring drill bit 1 consists of an inclined blade 101, a slag discharge chute 102, cutting teeth 103, a composite plate 104, a sample inlet 105, and a guide hole 106. The diameter of the guide hole 106 is more than 1 mm larger than the diameter of the sample inlet. A section of the right side of the right ball core seat 8 is located inside the guide hole. The inner diameter of the second channel 804 is equal to the diameter of the sample inlet. The inclined blade coring drill bit 1 drills forward to collect samples. The coal sample enters the second channel 804 through the sample inlet and guide hole of the inclined blade coring drill bit 1, and then enters the first channel through the connecting hole 1101 of the ball core 11, finally entering the gas sampling tube 2.
[0042] The high / low pressure switching slide valve 3 includes a horizontally arranged valve body. A reset pull ring 314 is located at the left end of the valve body. A connecting cavity is located inside the valve body, comprising a left cavity 306 and a right cavity 307 separated by a partition 308. A left cavity inlet 301 is located at the left end of the valve body, and a right cavity outlet 304 is located at the right end. A left cavity outlet 302 connecting to the left cavity and a right cavity inlet 303 connecting to the right cavity are located on the valve body wall. A push rod mounting hole 305 corresponding to the push rod assembly is located on the right end face of the valve body. The valve body wall is connected by a corresponding high / low pressure switching valve. The sealing groove 312 is equipped with a high-low pressure conversion sealing sleeve 311. The valve body wall is also provided with a slide valve sealing groove 310 and a slide valve shear pin hole 313. When the high-low pressure conversion slide valve 3 is installed inside the gas sampling tube, a slide valve sealing gasket 309 is installed in the slide valve sealing groove 310 to ensure a sealed connection between the high-low pressure conversion slide valve and the gas sampling tube. The high-low pressure conversion sealing sleeve 311 is used to seal the high-low pressure conversion slide valve 3 after it slides to the right to prevent water from entering the coal sample. The slide valve shear pin hole 313 is used to fix the position of the high-low pressure conversion slide valve 3 in the gas sampling tube 2.
[0043] The push rod assembly includes a first push rod 4 and a second push rod 402. The left ends of the first push rod 4 and the second push rod 402 are installed in the push rod mounting hole 305 and can be connected by threads. The right ends of the first push rod 4 and the second push rod 402 are connected to the ball core assembly. Limiting protrusions 401 are provided on the first push rod 4 and the second push rod 402. The ball core assembly includes a left ball core seat 7 and a ball core 11. The ball core 11 is installed on the right side of the left ball core seat 7. The left ball core seat 7 includes a first cylinder 704 arranged on the left and right sides. The first cylinder 704 has a first channel that connects the left and right sides. The first channel includes a flared section 706 with a gradually decreasing diameter from left to right and a section 703 with the same diameter. The body wall of the first cylinder 704 has a push rod through hole 705 that connects the left and right sides and corresponds to the first push rod 4 and the second push rod 402. The body wall of the cylinder 704 is provided with a limiting platform corresponding to the limiting protrusion 401. The right end of the first cylinder 704 is provided with a first step portion 702. The left ball core seat 7 and the ball core 11 are connected by a first polytetrafluoroethylene gasket 10 provided on the first step portion 702. The body wall of the first cylinder 704 is provided with a first fixing pin hole 701 in the radial direction. When the first push rod 4 and the second push rod 402 move to the right until the limiting protrusion 401 is limited by the limiting platform, the ball core 11 is just in the closed state.
[0044] The sphere core 11 includes a sphere with a through hole 1101 that runs horizontally through the sphere and is coaxial with the gas sampling tube 2. The sphere has an upper plane and a lower plane that are opposite each other. A first cylindrical boss 1105 is provided at the center of the upper plane, and a second cylindrical boss 1106 is provided at the center of the lower plane. A fixing shaft hole 1104 is provided on the first cylindrical boss 1105, and a reset shaft hole 1103 is provided on the second cylindrical boss 1106. A first rotating plate 1102 is provided between the first cylindrical boss 1105 and the upper plane, and a second rotating plate 1107 is provided between the second cylindrical boss and the lower plane. The right end of the first push rod 4 is in close contact with the first rotating plate 1102, and the right end of the second push rod 402 is in close contact with the second rotating plate 1107.
[0045] A right ball core seat 8 is provided on the right side of the ball core 11. The right ball core seat 8 includes a second cylinder 803 arranged on the left and right sides. The second cylinder 803 has a second channel 804 that runs through it from left to right. An extension plate 802 extends outward along the circumference from the left end of the second cylinder 803. A second step portion 801 is provided at the left end of the second cylinder 803. The right ball core seat 8 and the ball core 11 are connected by a second polytetrafluoroethylene gasket provided on the second step portion 801. A compression sealing sleeve 9 is fitted on the second cylinder 803. The compression sealing sleeve 9 includes a straight section 902 on the left and a contraction section 901 on the right. The compression sealing sleeve 9 is installed on the second cylinder 803 of the right ball core seat 8. When the inclined wing core drill bit 1 is pressed in and tightened, the right port of the second channel 804 aligns with the guide hole of the inclined wing core drill bit 1, causing the contraction section 901 of the sealing sleeve to press to the left and expand outward, thereby sealing the right side of the ball core 11.
[0046] like Figures 21 to 23As shown, unlike the above-mentioned right ball core seat 8, a threaded pressure block 20 can also be provided on the right side of the ball core 11. The threaded pressure block 20 can replace the right ball core seat 8 and the compression sealing sleeve 9. The threaded pressure block 20 includes a pressure block body arranged on the left and right sides. The pressure block body has a pressure block through hole 2001 that runs through the left and right sides. The left end of the pressure block body has a second step portion 2006. The threaded pressure block 20 and the ball core 11 are connected by a second polytetrafluoroethylene gasket provided on the second step portion 2006. The outer surface of the 0 is provided with a pressure block thread 2002, and the inner wall of the gas sampling tube 2 is provided with an internal thread corresponding to the pressure block thread 2002 so that the threaded pressure block 20 can be installed in the gas sampling tube 2 through threaded connection. The right end face of the pressure block body is provided with a pressure block disassembly port 2005 so that the threaded pressure block 20 can be installed and disassembled by a corresponding disassembly and assembly tool. The pressure block body is provided with at least two pressure block sealing grooves 2003. During installation, a pressure block sealing ring 2004 is provided in the pressure block sealing groove 2003 to ensure the sealing effect.
[0047] The outer surface of the gas sampling tube 2 is provided with a spiral groove 201 or a spiral rib; the tube wall of the gas sampling tube 2 is provided with a gas sampling hole 205, a first shear pin hole 206 and a second shear pin hole corresponding to the high and low pressure conversion slide valve 3, an oblique outlet 204 corresponding to the right end supply elbow 503 of the supply channel 5, a second fixing pin hole 203 corresponding to the first fixing pin hole 701 on the left ball core seat 7, a first rotating shaft hole 202 corresponding to the fixing rotating shaft hole 1104 on the ball core 11 and a second rotating shaft hole corresponding to the reset rotating shaft hole 1103 on the ball core 11. In addition, a high-low pressure conversion groove 209 corresponding to the high-low pressure conversion slide valve 3 is set in the gas sampling tube 2. The high-low pressure conversion groove 209 is set at the left cavity outlet 302 and the right cavity inlet 303 on the high-low pressure conversion slide valve 3, so that high pressure water can flow out through the left cavity outlet 302, flow through the high-low pressure conversion groove 209 and then flow in through the right cavity inlet 303.
[0048] The right end of the high-low pressure switching slide valve 3 is connected to a diversion tee 6 through the right cavity outlet 304. The diversion tee 6 is connected to the first supply pipe 502 and the second supply pipe 501. The first supply pipe 502 has a supply channel 5 inside, and the second supply pipe 501 has a supply channel 5 inside. The right ends of the first supply pipe 502 and the second supply pipe 501 are both connected to the inclined outlet 204 on the gas sampling pipe 2 through the supply elbow 503. The first supply pipe 502, the second supply pipe 501, the first push rod 4 and the second push rod 402 are all mounted on the support frame 12. The support frame 12 includes a circular frame body, on which are provided a first supply hole 1201 corresponding to the first supply pipe 502, a second supply hole 1202 corresponding to the second supply pipe 501, a first rod hole 1203 corresponding to the first push rod 4, and a second rod hole 1204 corresponding to the second push rod 402. Example 2
[0049] like Figure 19 and Figure 20 As shown, unlike Embodiment 1, both supply channels 5 can be set inside the wall of the gas sampling tube 2 to form a supply hole 210 in the tube wall. The left end of the supply hole 210 is connected to the left cavity 306. A plug 315 is provided in the inlet 303 and outlet 304 of the right cavity of the high-low pressure conversion slide valve 3. This design can eliminate the need for a complicated internal supply pipeline and achieve closed sampling with side supply. This closed sampler does not require machining of the high-low pressure conversion groove 209 during processing. First, a female thread is machined at the left end of the gas sampling tube 2 to form the first female thread 208, and a male thread is machined at the right end of the gas sampling tube 2. Form the first male thread 207. Cut the gas sampling tube 2 at the right side of the female thread. Drill a deep hole vertically to the right in the cut right half as the pipe wall supply hole 210. Then, use friction welding to re-weld the two cut parts together. Perform tempering treatment and internal and external weld seam cutting on the welded part. Machine thread grooves or thread ribs on the surface of the gas sampling tube 2. Drill a hole through the pipe wall of the gas sampling tube 2 at the left end of the pipe wall supply hole 210. Fill and weld the orifice on the surface of the gas sampling tube 2. Drill a hole along the pipe wall on the right side of the gas sampling tube 2 to the right end of the pipe wall supply hole 210 to form an oblique water outlet 204. This type of closed-loop sampler, with its side-supply system, supplies high-pressure water to the left end of the gas sampling tube 2 during the process of closing the core 11. The water enters the left cavity 306 through the left inlet 301. Simultaneously, driven by the high-pressure water, the first and second shear pins break, and the high / low pressure switching valve 3 moves to the right, causing the left cavity outlet 302 to be sealed by the inner wall of the gas sampling tube 2. Thus, the high-pressure water cannot flow into the supply hole 210 through the inlet 211, achieving the technical objective of preventing water from entering the gas sampling tube 2 through the drill bit 1 during the closing of the core 11. Furthermore, compressed air (0.3~0.7 MPa) is supplied during sampling, and high-pressure water above 1.0 MPa is required to close the core. Example 3
[0050] like Figure 24 and 25As shown, unlike Embodiment 2, two supply channels 5 can also be set on the outer surface of the outer wall of the gas sampling tube 2. A supply tube groove 214 is machined on the outer surface of the outer wall of the gas sampling tube 2. The outer wall supply tube 212 is welded or fused into the supply tube groove 214. The left end of the outer wall supply tube 212 is connected to the left cavity 306 of the high-low pressure conversion slide valve 3 through the tube wall inlet 215. The right cavity inlet 303 and right cavity outlet 304 of the high-low pressure conversion slide valve 3 are provided with plugs 315. This design can realize closed sampling of the outer wall supply. This closed sampler does not need to be processed by machining the high-low pressure conversion groove 209 or the tube wall supply hole 210, which greatly reduces the processing cost of internal cutting and deep hole cutting. First, a female thread 208 is machined on the left end of the gas sampling tube 2 to form a first female thread 208. A male thread 207 is machined on the right end of the gas sampling tube 2. A thread groove or thread rib is machined on the surface of the gas sampling tube 2. A supply pipe groove 214 is machined from right to left along the outer wall of the gas sampling tube 2 on the left side of the male thread. A hole is drilled at the left end of the supply pipe groove 214 into the inner wall of the gas sampling tube 2 to form a pipe wall inlet 215. Then, an outer wall supply pipe 212 is installed on the supply pipe groove 214. The left end of the outer wall supply pipe 212 is connected to the pipe wall inlet 215, and the right side is the outlet 213. The outer wall supply pipe 212 is fixed to the outer wall of the gas sampling tube 2 by welding or cladding. Example 4
[0051] The manufacturing process of a single-wall sealed sampler, wherein the single-wall sealed sampler is the one described in Example 1, includes the following steps: (1) First, process the gas sampling tube 2. Turn the female thread at the left end of the gas sampling tube 2 to form the first female thread 208. Turn the male thread at the right end of the gas sampling tube 2 to form the first male thread 207. Turn the high and low pressure conversion groove 209 on the right side of the female thread. Drill the first shear pin hole 206, the second shear pin hole, the gas measuring hole 205, the oblique water outlet 204, the second fixing pin hole 203, the first shaft hole 202, and the second shaft hole in sequence on the right side of the high and low pressure conversion groove 209. The hole positions should correspond to the positions of the components inside the tube. Then, perform fine machining on the inside of the gas sampling tube 2. The gas measuring hole 205 is sealed with a gas measuring screw 18 and a gas measuring hole sealing gasket 19. (2) Machining the ball core 11, specifically drilling a through hole 1101 on the ball, and cutting a first cylindrical boss 1105 and a second cylindrical boss 1106, as well as a first rotating plate 1102 and a second rotating plate 1107 on the ball. Then, drilling a fixing shaft hole 1104 on the first cylindrical boss 1105 on the upper plane, and drilling a reset shaft hole 1103 on the second cylindrical boss 1106 on the lower plane. The ball core 11 is installed between the left ball core seat 7 and the right ball core seat 8 through a detachable shaft pin 13 and a fixed shaft pin 14. A corresponding sealing gasket or O-ring is provided under the detachable shaft pin 13 and the fixed shaft pin 14.
[0052] (3) First, install the first push rod 4, the second push rod 402 and the diversion tee 6 on the right side of the high-low pressure conversion slide valve 3. Then, connect the left ends of the first supply pipe 502 and the second supply pipe 501 to the pipe opening of the diversion tee 6, and separate the first push rod 4, the second push rod 402, the first supply pipe 502 and the second supply pipe 501 with the support frame 12. Then, fix the high-low pressure conversion slide valve 3 inside the gas sampling pipe 2 and on the right end of the first female thread 208 through the first shear pin 17. At the same time, the supply elbow 503 is connected to the inclined outlet 204 of the gas sampling pipe 2. Next, fix the left ball core seat 7 and the first polytetrafluoroethylene gasket 10 on the right side of the first push rod 4 and the second push rod 402 through the push screw 16 and the corresponding push screw sealing gasket 15. At the same time, make sure that the first push rod 4 and the second push rod 402 pass through the left ball core seat 7. The top rod has a through hole 705; then the position of the ball core 11 is fixed by the detachable pivot pin 13 and the fixed pivot pin 14, and the connecting hole 1101 on the ball core 11 is coaxial with the gas sampling tube 2. At the same time, the first rotating plate 1102 and the second rotating plate are tightly attached to the first top rod 4 and the second top rod 402, respectively; then the right ball core seat 8 and the compression sealing sleeve 9 are installed on the right side of the ball core 11, and the right ball core seat 8 and the ball core 11 are connected by the second polytetrafluoroethylene gasket; then the inclined wing coring drill bit 1 is installed on the right end of the gas sampling tube 2. The inner front seat through hole of the inclined wing coring drill bit 1 corresponds to the right port of the second channel 804 of the right ball core seat 8. During installation, the two cooperate with each other to compress the sealing sleeve 9, so that it expands towards the tube wall of the gas sampling tube 2 to achieve a seal; finally, the gas measuring sealing gasket 19 and the gas measuring screw 18 on the gas measuring hole 205 are installed. Example 5
[0053] The manufacturing process of the single-wall sealed sampler, which is the single-wall sealed sampler described in Example 2, includes the following steps: (1) First, machine the female thread at the left end of the gas sampling tube 2 to form the first female thread 208, and machine the male thread at the right end of the gas sampling tube 2 to form the first male thread 207. Drill the first shear pin hole 206, the second shear pin hole, the gas measuring hole 205, the oblique water outlet 204, the second fixing pin hole 203, the first shaft hole 202, and the second shaft hole in sequence on the right side of the female thread. The hole positions should correspond to the positions of the components inside the tube. Then, perform fine machining on the inside of the gas sampling tube 2. The gas measuring hole 205 is sealed with a gas measuring screw 18 and a gas measuring hole sealing gasket 19. (2) Cut the gas sampling tube 2 at the right side of the female thread of the gas sampling tube 2. Drill a deep hole vertically to the right in the right half of the cut to make a pipe wall supply hole 210. Then, use friction welding to re-weld the two cut parts together. Perform tempering treatment and internal and external weld cutting on the welded parts. Drill a hole through the pipe wall of the gas sampling tube 2 at the left end of the pipe wall supply hole 210 to make a pipe wall inlet 211. Fill and weld the orifice on the outside of the gas sampling tube 2. Drill a hole along the pipe wall on the right side of the gas sampling tube 2 to the right end of the pipe wall supply hole 210 to make an oblique outlet 204. (3) Machining the ball core 11, specifically drilling a through hole 1101 on the ball, and cutting a first cylindrical boss 1105 and a second cylindrical boss 1106, as well as a first rotating plate 1102 and a second rotating plate 1107 on the ball. Then, drilling a fixed shaft hole 1104 on the first cylindrical boss 1105 on the upper plane, and drilling a reset shaft hole 1103 on the second cylindrical boss 1106 on the lower plane. The ball core 11 is installed between the left ball core seat 7 and the right ball core seat 8 through a detachable shaft pin 13 and a fixed shaft pin 14. A corresponding sealing gasket or O-ring is provided under the detachable shaft pin 13 and the fixed shaft pin 14. (4) First, install the first push rod 4 and the second push rod 402 on the right side of the high-low pressure conversion slide valve 3, and separate the first push rod 4 and the second push rod 402 with the support frame 12; then fix the high-low pressure conversion slide valve 3 inside the gas sampling tube 2 and at the right end of the first female thread 208 by the first shear pin 17 and the second shear pin; then fix the left ball core seat 7 and the first polytetrafluoroethylene gasket 10 to the right side of the first push rod 4 and the second push rod 402 by the push rod 16 and the corresponding push rod sealing gasket 15, while ensuring that the first push rod 4 and the second push rod 402 pass through the push rod through hole 705 on the left ball core seat 7; then fix the position of the ball core 11 by the detachable rotating shaft pin 13 and the fixed shaft pin 14, and make the ball core 11 The connecting hole 1101 on the upper part is coaxial with the gas sampling tube 2, and the first rotating plate 1102 and the second rotating plate are respectively tightly attached to the first push rod 4 and the second push rod 402; then the right ball core seat 8 and the compression sealing sleeve 9 are installed on the right side of the ball core 11, and the right ball core seat 8 and the ball core 11 are connected by the second polytetrafluoroethylene gasket; next, the inclined wing coring drill bit 1 is installed on the right end of the gas sampling tube 2, and the inner front seat through hole of the inclined wing coring drill bit 1 corresponds to the right port of the second channel 804 of the right ball core seat 8. During installation, the inclined wing coring drill bit 1 and the right ball core seat 8 cooperate with each other to compress the sealing sleeve 9, so that it expands towards the tube wall of the gas sampling tube 2 to achieve a seal; finally, the gas measuring sealing gasket 19 and the gas measuring screw 18 on the gas measuring hole 205 are installed. Example 6
[0054] A closed sampling method, implemented based on the single-wall closed sampler described in Embodiment 1, includes the following steps: (1) After the sampling device is installed, it is connected to the directional drilling rig through the first female thread 208 and the corresponding adapter; (2) Control the drilling rig to send the sealed sampler to the designated position, and then drill and sample. At the same time, gas is supplied to the left end of the sealed sampler. The gas enters the left cavity through the left cavity inlet 301, and then flows out of the left cavity through the left cavity outlet 302. After flowing through the high and low pressure conversion tank 209, it enters the right cavity through the right cavity inlet 303, and then enters the diversion tee 6 through the right cavity outlet 304. Then it is diverted to the supply channel 5 of the first supply pipe 502 and the supply channel 5 of the second supply pipe 501. Finally, it flows to the outside of the sealed sampler through the corresponding supply elbow 503 and the inclined outlet 204. (3) After the sampling drilling is 0.5 to 5 meters, the air pipe at the left end is replaced with a high-pressure water pipe to continuously deliver high-pressure water into the sealed sampler. Under the action of the high-pressure water, the first shear pin 17 and the second shear pin break. The high-pressure water continues to push the high-low pressure conversion slide valve 3 to the right. The high-low pressure conversion slide valve 3 pushes the first top rod 4 and the second top rod 402 to the right. The first top rod 4 and the second top rod 402 push the first rotating plate and the second rotating plate on the ball core 11 to rotate. When the limiting protrusion 401 on the first top rod 4 is connected to the upper limit platform of the left ball core seat 7, the ball core 11 rotates 90 degrees, so that the connecting hole 1101 of the ball core 11 rotates from the left and right direction to the up and down direction. The left and right closure of the ball core 11 seals the coal sample. (4) Stop the water supply and remove the sealed sampler. Insert the gas desorption instrument into the gas measuring hole 205 for on-site desorption. Then remove the drill bit, use the appropriate tools to return the ball core 11 to its original position, pour the coal sample into the coal sample container, and take it to the laboratory for gas content determination.
[0055] This application simplifies the structure of the original three-layer or double-layer tube closed sampling device, realizing closed sampling with a single-layer tube. The structure is simple and easy to operate. It adopts an internal top rod structure to seal the ball core 11, and realizes the outflow of high-pressure water through the corresponding flow channel 5, thereby cooling and removing slag from the closed sampling tube. This greatly improves the efficiency of closed sampling and effectively solves the technical problem of low sampling efficiency caused by the complex structure and poor sealing effect of the existing closed sampling device.
[0056] The above embodiments are only used to illustrate and not limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention without departing from the spirit and scope of the present invention. Any modifications or partial substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A single-walled sealed sampler, characterized in that: It includes a horizontally arranged gas sampling tube and a winged coring drill bit. The left end of the gas sampling tube is provided with a first female thread, and the right end of the gas sampling tube is provided with a first male thread. The left end of the winged coring drill bit is provided with a second female thread, and the winged coring drill bit is installed at the right end of the gas sampling tube. The gas sampling tube is equipped with a high-low pressure switching slide valve. The high-low pressure switching slide valve is located on the right side of the first female thread. The right end of the high-low pressure switching slide valve is connected to the left end of the push rod assembly. The right end of the push rod assembly is connected to the ball core assembly. The high-low pressure switching slide valve is equipped with a connecting cavity. The connecting cavity is connected to a flow supply channel. The right end of the flow supply channel passes through the wall of the gas sampling tube and connects to the outside of the gas sampling tube. The high-low pressure switching slide valve includes a horizontally arranged valve body, a reset pull ring at the left end of the valve body, a connecting cavity inside the valve body, the connecting cavity including a left cavity and a right cavity separated by a partition, a left cavity inlet at the left end of the valve body, a right cavity outlet at the right end of the valve body, a left cavity outlet connecting the left cavity and a right cavity inlet connecting the right cavity on the valve body wall, and a push rod mounting hole corresponding to the push rod assembly on the right end face of the valve body; A high-low pressure conversion sealing sleeve is installed on the valve body wall through a corresponding high-low pressure conversion sealing groove. The high-low pressure conversion sealing groove is set at the corresponding position of the left cavity outlet and the right cavity inlet, and the high-low pressure conversion sealing sleeve is provided with a left cavity hole and a right cavity hole corresponding to the left cavity outlet and the right cavity inlet. The valve body wall is also provided with a slide valve sealing groove and a slide valve shear pin hole. When the high-low pressure conversion slide valve is installed inside the gas sampling tube, a slide valve sealing gasket is installed in the slide valve sealing groove to ensure a sealed connection between the high-low pressure conversion slide valve and the gas sampling tube.
2. The single-wall sealed sampler according to claim 1, characterized in that: The push rod assembly includes a first push rod and a second push rod. The left ends of the first push rod and the second push rod are installed in the push rod mounting hole, and the right ends of the first push rod and the second push rod are connected to the ball core assembly. Limiting protrusions are provided on the first push rod and the second push rod. The ball core assembly includes a left ball core seat and a ball core. The ball core is installed on the right side of the left ball core seat. The left ball core seat includes a first cylinder arranged on the left and right. The first cylinder has a first channel that connects the left and right sides. The first channel includes a flared section with a gradually decreasing diameter from left to right and a section with the same diameter. The body wall of the first cylinder has a through hole corresponding to the first push rod and the second push rod. The body wall of the first cylinder has a limiting platform corresponding to the limiting protrusion. The right end of the first cylinder has a first step. The left ball core seat and the ball core are connected by a first polytetrafluoroethylene gasket provided on the first step. The body wall of the first cylinder has a first fixing pin hole arranged radially. The sphere core includes a sphere with a through hole that runs horizontally through it and is coaxial with the gas sampling tube. The sphere has an upper plane and a lower plane that are opposite each other. A first cylindrical boss is provided at the center of the upper plane, and a second cylindrical boss is provided at the center of the lower plane. A fixing shaft hole is provided on the first cylindrical boss, and a reset shaft hole is provided on the second cylindrical boss. A first rotating plate is provided between the first cylindrical boss and the upper plane, and a second rotating plate is provided between the second cylindrical boss and the lower plane. The right end of the first push rod is in close contact with the first rotating plate, and the right end of the second push rod is in close contact with the second rotating plate.
3. The single-wall sealed sampler according to claim 2, characterized in that: A right ball core seat is provided on the right side of the ball core. The right ball core seat includes a second cylinder arranged on the left and right. The second cylinder has a second channel that runs through it from left to right. An extension plate is provided on the left end of the second cylinder along the circumference. A second step is provided on the left end of the second cylinder. The right ball core seat and the ball core are connected by a second polytetrafluoroethylene gasket provided on the second step. A compression sealing sleeve is fitted on the second cylinder. The compression sealing sleeve includes a straight section on the left and a contracted section on the right.
4. The single-wall sealed sampler according to claim 2, characterized in that: A threaded pressure block is provided on the right side of the ball core. The threaded pressure block includes a pressure block body arranged on the left and right. The pressure block body has a pressure block through hole that runs from left to right. A second step is provided at the left end of the pressure block body. The threaded pressure block and the ball core are connected by a second polytetrafluoroethylene gasket provided on the second step. The outer surface of the threaded pressure block is provided with a pressure block thread. The inner wall of the gas sampling tube is provided with an internal thread corresponding to the pressure block thread so that the threaded pressure block can be installed in the gas sampling tube by threaded connection. A pressure block disassembly port is provided on the right end face of the pressure block body so that the threaded pressure block can be installed and disassembled by appropriate disassembly and assembly tools. At least two pressure block sealing grooves are provided on the pressure block body, and a pressure block sealing ring is provided in the pressure block sealing groove.
5. The single-wall sealed sampler according to claim 3 or 4, characterized in that: The right end of the high-low pressure switching slide valve is connected to a flow divider tee through the right cavity outlet. The flow divider tee is connected to the first supply pipe and the second supply pipe. There are two supply channels, which are respectively set in the first supply pipe and the second supply pipe. The right ends of the first supply pipe and the second supply pipe are connected to the inclined water outlet set on the gas sampling pipe through the supply elbow, thereby connecting to the outside of the gas sampling pipe. The first supply pipe, the second supply pipe, the first push rod and the second push rod are all set on the support frame. The support frame includes a circular frame, on which are provided a first supply hole corresponding to the first supply pipe, a second supply hole corresponding to the second supply pipe, a first rod hole corresponding to the first push rod, and a second rod hole corresponding to the second push rod; The outer surface of the gas sampling tube is provided with a spiral groove or spiral rib. The tube wall is provided with a gas sampling hole, a first shear pin hole and a second shear pin hole corresponding to the high and low pressure conversion slide valve, a second fixing pin hole corresponding to the first fixing pin hole on the left ball core seat, an oblique outlet corresponding to the outlet end of the supply channel, a first rotating shaft hole corresponding to the fixing rotating shaft hole on the ball core and a second rotating shaft hole corresponding to the reset rotating shaft hole on the ball core. The inner wall of the gas sampling tube is provided with a high and low pressure conversion groove, which is located at a position corresponding to the outlet of the left cavity and the inlet of the right cavity.
6. The single-walled sealed sampler according to claim 3 or 4, characterized in that: There are two flow channels. Both flow channels are set inside the pipe wall of the gas sampling tube to form corresponding pipe wall flow holes. The left end of the pipe wall flow hole is connected to the left cavity. The right cavity inlet and right cavity outlet of the high-low pressure conversion slide valve are equipped with plugs. The outer surface of the gas sampling tube is provided with a spiral groove or spiral rib. The tube wall of the gas sampling tube is provided with a gas sampling hole, a first shear pin hole and a second shear pin hole corresponding to the high and low pressure conversion slide valve, a second fixing pin hole corresponding to the first fixing pin hole on the left ball core seat, an oblique water outlet corresponding to the outlet end of the supply channel, a first rotating shaft hole corresponding to the fixing rotating shaft hole on the ball core, and a second rotating shaft hole corresponding to the reset rotating shaft hole on the ball core.
7. The single-wall sealed sampler according to claim 3 or 4, characterized in that: There are two supply channels, both of which are located on the outer wall supply pipe. The outer wall supply pipe is located on the outer surface of the gas sampling tube. The left end of the outer wall supply pipe is connected to the left chamber of the high-low pressure switching slide valve through the corresponding pipe wall inlet. The right chamber inlet and right chamber outlet of the high-low pressure switching slide valve are equipped with plugs. The outer surface of the gas sampling tube is provided with a spiral groove or spiral rib. The outer surface of the gas sampling tube is provided with an outer wall supply pipe groove corresponding to the outer wall supply pipe. The outer wall supply pipe is welded or fused into the outer wall supply pipe groove. The tube wall of the gas sampling tube is provided with a gas measuring hole, a first shear pin hole and a second shear pin hole corresponding to the high and low pressure conversion slide valve, a second fixing pin hole corresponding to the first fixing pin hole on the left ball core seat, an oblique water outlet corresponding to the outlet end of the supply channel, a first rotating shaft hole corresponding to the fixing rotating shaft hole on the ball core, and a second rotating shaft hole corresponding to the reset rotating shaft hole on the ball core.
8. The manufacturing process of a single-walled sealed sampler, characterized in that: The single-wall sealed sampler is any one of the single-wall sealed samplers described in claims 1 to 5, and includes the following steps: (1) First, machine the female thread at the left end of the gas sampling tube to form the first female thread, and machine the male thread at the right end of the gas sampling tube to form the first male thread. Then, machine the high and low pressure conversion groove on the right side of the female thread. Drill the first shear pin hole, the second shear pin hole, the gas measuring hole, the oblique water outlet, the second fixing pin hole, the first shaft hole, and the second shaft hole in sequence on the right side of the high and low pressure conversion groove. The hole positions should correspond to the positions of the components inside the tube. Then, perform fine machining on the inside of the gas sampling tube. (2) Machining the ball core, specifically drilling a through hole on the ball, and cutting out a first cylindrical boss and a second cylindrical boss, as well as a first rotating plate and a second rotating plate, that are symmetrical on the ball. Then, drilling a fixed shaft hole on the first cylindrical boss on the upper plane and drilling a reset shaft hole on the second cylindrical boss on the lower plane. (3) First, install the first push rod, the second push rod, and the diversion tee on the right side of the high-low pressure conversion slide valve. Then, connect the left ends of the first and second supply pipes to the port of the diversion tee and separate the first push rod, the second push rod, the first supply pipe, and the second supply pipe with a support frame. Then, install the high-low pressure conversion slide valve inside the gas sampling pipe and on the right side of the first female thread through the fixing pin. At the same time, connect the supply elbow to the outside of the gas sampling pipe. Next, fix the left ball core seat and the first PTFE gasket to the right side of the first and second push rods through the push screw. At the same time, make sure that the first and second push rods pass through the push rod through hole on the left ball core seat. Then, fix the left ball core seat and the first PTFE gasket to the right side of the first and second push rods through the detachable rotating shaft pin. The ball core is fixed in position with the fixed shaft pin, and the through hole of the ball core is made coaxial with the gas sampling tube. At the same time, the first rotating plate and the second rotating plate are tightly attached to the first push rod and the second push rod, respectively. Then, the right ball core seat and the compression sealing sleeve are installed on the right side of the ball core, and the right ball core seat and the ball core are connected by the second polytetrafluoroethylene gasket. Next, the inclined wing coring drill bit is installed at the right end of the gas sampling tube. The inner front seat through hole of the inclined wing coring drill bit corresponds to the right port of the second channel of the right ball core seat. During installation, the inclined wing coring drill bit and the right ball core seat cooperate with each other to act on the compression sealing sleeve, so that the compression sealing sleeve expands towards the wall of the gas sampling tube to achieve a seal. Finally, the gas measuring sealing gasket and gas measuring screw on the gas measuring hole are installed.
9. The manufacturing process of a single-walled sealed sampler, characterized in that: The single-wall sealed sampler is any one of the single-wall sealed samplers described in claims 1 to 4 and claim 6, and includes the following steps: (1) First, machine the female thread at the left end of the gas sampling tube to form the first female thread, and machine the male thread at the right end of the gas sampling tube to form the first male thread. Drill the first shear pin hole, the second shear pin hole, the gas measuring hole, the second fixing pin hole, the first shaft hole and the second shaft hole in sequence on the right side of the female thread. The hole positions should correspond to the positions of the components inside the tube. Then, perform fine machining on the inside of the gas sampling tube. (2) Cut the gas sampling tube at the right side of the female thread of the gas sampling tube. Drill a deep hole vertically to the right in the right half of the cut to make a pipe wall supply hole. Then, use friction welding to re-weld the two cut parts together. Perform tempering treatment and internal and external weld cutting on the welded parts. Drill a hole through the pipe wall of the gas sampling tube at the left end of the pipe wall supply hole to make a pipe wall inlet. Fill and weld the orifice on the outside of the gas sampling tube. Drill a hole along the pipe wall on the right side of the gas sampling tube to the right end of the pipe wall supply hole to make an oblique outlet. (3) Machining the ball core, specifically drilling a through hole on the ball, and cutting out a first cylindrical boss and a second cylindrical boss, as well as a first rotating plate and a second rotating plate, that are symmetrical on the ball. Then, drilling a fixed shaft hole on the first cylindrical boss on the upper plane and drilling a reset shaft hole on the second cylindrical boss on the lower plane. (4) First, install the first and second push rods on the right side of the high-low pressure conversion slide valve, and separate the first and second push rods with a support frame. Then, install the high-low pressure conversion slide valve inside the gas sampling tube and on the right side of the first female thread using a fixing pin. Next, fix the left ball core seat and the first PTFE gasket to the right side of the first and second push rods using a push screw, while ensuring that the first and second push rods pass through the push rod through hole on the left ball core seat. Then, fix the position of the ball core using a detachable rotating shaft pin and a fixed shaft pin, and make the ball core through hole coaxial with the gas sampling tube. The first and second rotating plates are tightly attached to the first and second push rods, respectively. Then, the right ball core seat and the compression sealing sleeve are installed on the right side of the ball core, and the right ball core seat and the ball core are connected by the second polytetrafluoroethylene gasket. Next, the inclined wing coring drill bit is installed on the right end of the gas sampling tube. The inner front seat through hole of the inclined wing coring drill bit corresponds to the right port of the second channel of the right ball core seat. During installation, the inclined wing coring drill bit and the right ball core seat cooperate with each other to act on the compression sealing sleeve, so that the compression sealing sleeve expands towards the wall of the gas sampling tube to achieve a seal. Finally, the gas measuring sealing gasket and gas measuring screw on the gas measuring hole are installed.
10. A closed sampling method, implemented based on a single-wall closed sampler as described in any one of claims 1 to 5, characterized in that, Includes the following steps: (1) After the sampling device is installed, it is connected to the directional drilling machine through the first female thread and the corresponding adapter; (2) Control the drilling rig to send the sealed sampler to the designated position, and then drill and sample. At the same time, gas is supplied to the left end of the sealed sampler. The gas enters the left cavity through the left cavity inlet and then flows out of the left cavity through the left cavity outlet. Then it enters the right cavity through the right cavity inlet and then enters the diversion tee through the right cavity outlet. Then it is diverted to the supply channel of the first supply pipe and the supply channel of the second supply pipe, and finally flows to the outside of the sealed sampler through the corresponding supply elbow. (3) After the sampling drilling is 0.5 to 5 meters, the air pipe at the left end is replaced with a high-pressure water pipe to continuously deliver high-pressure water into the sealed sampler. Under the action of the high-pressure water, the first and second shear pins break. The high-pressure water continues to push the high-low pressure conversion slide valve to the right. The high-low pressure conversion slide valve pushes the first and second push rods to the right. The first and second push rods push the first and second rotating plates on the ball core to rotate. When the limiting protrusion on the first push rod connects with the limiting platform on the left ball core seat, the ball core rotates 90°, so that the connecting hole of the ball core rotates from the left and right direction to the up and down direction. The left and right directions of the ball core are closed to seal the coal sample. (4) Stop the water supply and remove the sealed sampler. Insert the gas desorber into the gas measuring hole for on-site desorption. Then remove the drill bit, use the appropriate tools to return the ball core to its position, pour the coal sample into the coal sample container, and take it to the laboratory for gas content determination.