CN216517978U - Double-tube sampling device for underground coal mine - Google Patents
Double-tube sampling device for underground coal mine Download PDFInfo
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- CN216517978U CN216517978U CN202123174032.8U CN202123174032U CN216517978U CN 216517978 U CN216517978 U CN 216517978U CN 202123174032 U CN202123174032 U CN 202123174032U CN 216517978 U CN216517978 U CN 216517978U
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Abstract
The utility model discloses a double-pipe sampling device for a coal mine underground, which comprises an adapter, a sampling pipe body, a drill bit and a plugging ball, wherein one end of the adapter is connected with the drill bit through the sampling pipe body, the other end of the adapter is connected with an external drive through a drill rod, the tail part of the drill rod is provided with an air feeder for supplying air to the sampling device, and the external drive drives the adapter to drive the drill bit to rotate by taking the axis of the drill bit as a rotating shaft. According to the utility model, air can be supplied to the sampling device through the air feeder, the sampling tube body is set to be of a double-layer hollow tubular structure, and the central air duct and the side air duct are arranged in the adapter, so that the technical requirements of deslagging in the drilling process and air outlet at the end part of the drill bit during sampling can be met, the phenomenon of high temperature caused by no air drying and long-time grinding with a coal bed is prevented, the coal taking quality of a deep hole is improved, the phenomenon of nature of the inner coal bed is prevented, and the technical problem of difficulty in soft crushed coal sampling is solved.
Description
Technical Field
The utility model relates to the technical field of coal sample collection, in particular to a double-tube sampling device for underground coal mine.
Background
Coal samples are required to be obtained in coal mine underground outburst coal seam zoning, gas basic data collection, underground investigation and evaluation in ground area management and the like, and then gas content indexes are measured. In order to meet the development requirement of transparentization of underground disaster control of a coal mine, the technical advantages of directional drilling and accurate construction are fully utilized, the target of fixed-point sampling can be achieved, and the problem that how to safely and efficiently obtain coal samples from deep holes is urgent to solve is solved aiming at the technical problem that sampling of a broken soft coal bed is difficult.
A conventional patent publication No. CN102042015A discloses a coal sample collecting device and method, wherein the method includes: cleaning sundries at the bottom of the drill hole; in the drilling process, blowing compressed air into a gap between an inner pipe and an outer pipe of the double-pipe positive-pressure counter-flow drill rod through an air-water pipeline arranged on the outer wall of the side-in type rotator; and the drill bit forms a compressed air vortex at the bottom of the drill hole by the compressed air, and the compressed air vortex is utilized to blow out the coal cinder at the bottom of the drill hole from the inner pipe so as to obtain a coal sample. The coal sample collection device has the advantages that the coal sample collection is carried out while the coal sample is tunneled by the drill bit, and the drill rod does not need to be withdrawn when the coal sample is drilled, so that a large amount of construction time is saved, the coal sample collection cost is reduced, the purposes of effectively carrying out the coal sample collection and accurately measuring the gas content are achieved, and the influence on the coal bed tunneling construction progress due to the low prediction efficiency of the coal bed gas outburst is further avoided.
However, the conventional rock core pipe is adopted for sampling coal samples, so that the defects that the sampling depth is shallow, the obtained coal samples are few, and only non-pressure air drying can be used for sampling exist, the quality of the obtained coal samples is influenced due to high temperature caused by long-time grinding of coal beds, spontaneous combustion of the coal beds in holes is easily caused, carbon monoxide is generated, and the safety threat is large.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problems of how to realize the deep hole coal sample acquisition in the air supply state and prevent the coal sample from high-temperature spontaneous combustion and the like caused by sampling dry grinding.
The utility model solves the technical problems through the following technical means: the double-pipe sampling device for the underground coal mine comprises an adapter, a sampling pipe body, a drill bit and a plugging ball, wherein one end of the adapter is connected with the drill bit through the sampling pipe body, the other end of the adapter is connected with an external drive through a drill rod, the tail part of the drill rod is provided with an air feeder for supplying air to the sampling device, and the external drive drives the adapter to drive the drill bit to rotate by taking the axis of the drill bit as a rotating shaft; a central air duct and a side air duct are arranged in the adapter, the sampling tube body is of a double-layer hollow tubular structure, an annular channel is formed between two layers of tube walls of the sampling tube body, an inlet of the side air duct is communicated with the central air duct, and an outlet of the side air duct is communicated with an inlet of the annular channel; the air pressure measuring device is characterized in that a blocking ball is arranged in the central air duct, a limiting structure used for limiting the blocking ball is arranged at one end, facing the sampling tube body, of the central air duct, the blocking ball blocks communication between the central air duct and a central hole of the sampling tube body, and compressed air flows through the drill rod and the central air duct and is discharged from the annular channel.
Can carry out the air feed for sampling device through the air feeder, through setting up the sample body into double-deck cavity tubular structure, and set up central wind channel and side wind channel in the crossover sub, can satisfy the technical requirement of device row sediment and sample drill bit tip air-out when the in-process of drilling down simultaneously, prevent to appear not have air-dry get and grind the phenomenon that causes the high temperature with the coal seam for a long time, when having improved the deep hole and got the coal quality, the phenomenon that the coal seam is natural in having prevented to appear, the difficult technical problem of soft broken coal sample has also been solved.
As a preferred technical scheme, the limiting structure is that a ball seat is arranged at one end of the adapter facing the sampling tube body, the ball seat is positioned in a central hole of the sampling tube body and is provided with a ball seat through hole, and the ball seat through hole is communicated with a central air duct and the central hole of the sampling tube body; the ball seat through-hole is provided with the cambered surface groove towards the one end of crossover sub for spacing shutoff ball, through the setting of ball seat, can improve the shutoff effect.
As preferred technical scheme, the sample body includes sample inner tube and the sample outer tube of coaxial setting, the one end shaping that crossover sub and sample body link to each other has first pin thread and second pin thread, first pin thread and second pin thread are located side wind channel export both sides respectively, first pin thread links to each other with sample outer tube one end, the second pin thread links to each other with sample inner tube one end, sample inner tube external diameter is less than sample outer tube internal diameter.
According to the preferable technical scheme, the drill bit comprises an inner tube drill bit and an outer tube drill bit, the inner tube drill bit is connected with the other end of the sampling inner tube, the outer tube drill bit is connected with the other end of the sampling outer tube, and the outer diameter of the inner tube drill bit is smaller than the inner diameter of the outer tube drill bit.
As a preferred technical scheme, the blocking ball is a plastic ball.
As a preferable technical scheme, the ball seat, the adapter, the sampling inner tube and the sampling outer tube are coaxial in axial line.
According to the preferable technical scheme, the outer pipe drill bit is in threaded connection with the sampling outer pipe, and the inner pipe drill bit is in threaded connection with the sampling inner pipe.
As a preferred technical scheme, cutting teeth are uniformly distributed on one ends, far away from the adapter, of the inner pipe drill bit and the outer pipe drill bit along the circumferential direction of the inner pipe drill bit and the outer pipe drill bit.
Preferably, the cutting teeth are made of alloy.
Preferably, the ball seat is in threaded connection with the adapter.
The utility model has the advantages that:
(1) according to the utility model, air can be supplied to the sampling device through the air feeder, the sampling tube body is set to be of a double-layer hollow tubular structure, and the central air duct and the side air duct are arranged in the adapter, so that the technical requirements of deslagging in the drilling process and air outlet at the end part of the drill bit during sampling can be met, the phenomenon of high temperature caused by no air drying and long-time grinding with a coal bed is prevented, the coal taking quality of a deep hole is improved, the phenomenon of nature of the inner coal bed is prevented, and the technical problem of difficulty in soft crushed coal sampling is solved.
(2) In the utility model, the sampling device liquid can be used for sampling the soft rock in the deep hole, and the fixed-point coal sampling can be realized by combining the directional drilling technology.
Drawings
Fig. 1 is a schematic overall structural diagram of a dual-tube sampling device for underground coal mine provided by an embodiment of the utility model;
FIG. 2 is a schematic view of a conversion joint structure of a dual-tube sampling device for underground coal mine according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a ball seat of a dual-tube sampling device for underground coal mines according to an embodiment of the utility model;
fig. 4 is a schematic structural diagram of a sampling outer tube of a dual-tube sampling device for underground coal mine provided by an embodiment of the utility model;
FIG. 5 is a schematic structural diagram of a sampling inner tube of a dual-tube sampling device for underground coal mine according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of an inner pipe drill bit of a dual-pipe sampling device for underground coal mine according to an embodiment of the present invention;
FIG. 7 is a schematic structural view of an end face of an inner tube drill bit of the dual-tube sampling device for underground coal mine according to the embodiment of the present invention;
FIG. 8 is a schematic structural diagram of an outer pipe drill bit of a dual-pipe sampling device for underground coal mines according to an embodiment of the utility model;
fig. 9 is a schematic structural view of an end face of an outer pipe drill bit of the dual-pipe sampling device for underground coal mine according to the embodiment of the utility model;
reference numerals: 1. a crossover sub; 11. a central air duct; 12. a side air duct; 2. sampling an inner tube; 3. sampling an outer tube; 4. an inner tube drill bit; 5. an outer tube drill bit; 6. a ball seat; 61. a ball seat through hole; 7. and (5) sealing the ball.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the dual-tube sampling device for the underground coal mine comprises: the air supply device comprises a conversion joint 1, a sampling pipe body, a drill bit, a ball seat 6 and a blocking ball 7, wherein one end of the conversion joint 1 is fixedly connected with the drill bit through the sampling pipe body, the other end of the conversion joint 1 is connected with an external drive (such as a drilling machine) through a drill rod, the tail part of the drill rod is fixedly provided with an air supply device for supplying air to a sampling device, the external drive drives the drill bit to rotate by taking the axis thereof as a rotating shaft through driving the conversion joint 1, referring to fig. 2 and 3, a central air duct 11 and a side air duct 12 are arranged in the conversion joint 1, the inlet of the side air duct 12 is communicated with the central air duct 11, the blocking ball 7 is arranged in the central air duct 11, and one end of the central air duct 11, which faces the sampling pipe body, is provided with the ball seat 6 for limiting the blocking ball 7; ball seat 6 and 1 threaded connection of crossover sub, ball seat through-hole 61 has been seted up to the ball seat, ball seat through-hole 61 communicates central wind channel 11 and sample body centre bore, ball seat through-hole 61 is provided with the cambered surface groove towards the one end of crossover sub 1 for spacing shutoff ball 7, 7 materials of shutoff ball can be for the plastic ball, shutoff ball 7 blocks the intercommunication in central wind channel 11 and sample body centre bore, the drilling rod is flowed through to the forced air, central wind channel 11 and is discharged by side wind channel 12.
Referring to fig. 1, 4 and 5, the sampling tube body is a double-layer hollow tubular structure, the sampling tube body includes an inner sampling tube 2 and an outer sampling tube 3, both the inner sampling tube 2 and the outer sampling tube 3 are hollow tubular structures, the inner sampling tube 2 is located in a central hole of the outer sampling tube 3 and the axes of the two are coaxial, an annular channel is formed in the region between the inner sampling tube 2 and the outer sampling tube 3, a first male thread and a second male thread are formed at one end of the adapter 1 connected with the sampling tube body, a thread adapted to the drill rod is formed at one end of the adapter 1 facing the drill rod, the first male thread and the second male thread are respectively located at two sides of an outlet of the side air duct 12, the first male thread is located at one end of the outlet of the side air duct 12 away from the ball seat 6, the second male thread is located at one end of the outlet of the side air duct 12 facing the ball seat 6, the first male thread is in threaded connection with one end of the outer sampling tube 3, the second pin thread is connected with 2 one end screw threads of sample inner tube, and 2 external diameters of sample inner tube are less than 3 internal diameters of sample outer tube.
Referring to fig. 1, 6 and 8, the drill bit includes an inner tube drill bit 4 and an outer tube drill bit 5, the inner tube drill bit 4 is in threaded connection with the other end of the sampling inner tube 2, the outer tube drill bit 5 is in threaded connection with the other end of the sampling outer tube 3, the outer diameter of the inner tube drill bit 4 is smaller than the inner diameter of the outer tube drill bit 5, the end face of the outer tube drill bit 5, which is far away from one end of the adapter 1, is located on the right side of the end face of the inner tube drill bit 4, which is far away from one end of the adapter 1, referring to fig. 7 and 9, cutting teeth are uniformly distributed at the ends, which are far away from the adapter 1, of the inner tube drill bit 4 and the outer tube drill bit 5 along the circumferential direction of the ends, and the number of the cutting teeth is 6-8.
The sampling method comprises the following steps:
(1) conventionally drilling or directionally drilling to a sampling point by using a drilling machine, and installing a double-pipe sampling device before tripping out;
(2) the sampling device is lowered to the bottom of the hole by using the power of a drilling machine, in the process of drilling, the compressed air is opened maximally by an air supply device every 30m, and is discharged by flowing through a drill rod, a central air duct 11 and a side air duct 12 through the compressed air, so that the coal rock powder and the residues in the hole entering the sampling inner tube 2 are discharged, and the cleanness of the sampling inner tube 2 is ensured;
(3) drilling down to the bottom of a hole, firstly opening compressed air to the maximum extent, performing rotary drilling for 0.5m, then closing the compressed air, disassembling an air feeder, naturally throwing a blocking ball 7 from the air feeder, reinstalling the air feeder, opening the compressed air to the maximum extent, blowing the blocking ball 7 to an arc groove of a ball seat 6 to block a central air duct 11, changing the direction of air flow at the moment, and discharging the compressed air from an annular channel of a sampling pipe body through a drill rod, the central air duct 11 and a side air duct 12;
(4) the opening of a valve on an air supply pipeline is adjusted, air supply is reduced appropriately, the orifice return breeze is taken as a standard, then rotary drilling sampling is carried out, after 1-1.5 m of drilling is carried out, air pressure is closed, and sampling is finished;
(5) and (4) removing the drill, disassembling the sampling device, and filling the obtained coal sample into a coal sample tank for measuring the gas content.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The double-pipe sampling device for the underground coal mine is characterized by comprising an adapter (1), a sampling pipe body, a drill bit and a plugging ball (7), wherein one end of the adapter (1) is connected with the drill bit through the sampling pipe body, the other end of the adapter (1) is connected with an external drive through a drill rod, an air feeder is arranged at the tail part of the drill rod and used for supplying air to the sampling device, and the external drive drives the adapter (1) to drive the drill bit to rotate by taking the axis of the drill bit as a rotating shaft; a central air duct (11) and a side air duct (12) are arranged in the adapter (1), the sampling tube body is of a double-layer hollow tubular structure, an annular channel is formed between two layers of tube walls of the sampling tube body, an inlet of the side air duct (12) is communicated with the central air duct (11), and an outlet of the side air duct (12) is communicated with an inlet of the annular channel; be equipped with in central wind channel (11) shutoff ball (7), central wind channel (11) are provided with the limit structure who is used for spacing shutoff ball (7) towards the one end of sample body, shutoff ball (7) block the intercommunication of central wind channel (11) and sample body centre bore, and the drilling rod, central wind channel (11) and discharge by annular channel are flowed through to the pressure wind.
2. The coal mine underground double-pipe sampling device according to claim 1, wherein the limiting structure is that a ball seat (6) is installed at one end of the adapter (1) facing the sampling pipe body, the ball seat (6) is located in a central hole of the sampling pipe body and is provided with a ball seat through hole (61), and the ball seat through hole (61) is communicated with the central air duct (11) and the central hole of the sampling pipe body; one end of the ball seat through hole (61) facing the adapter (1) is provided with an arc groove for limiting the plugging ball (7).
3. The coal mine underground double-pipe sampling device according to claim 2, wherein the sampling pipe body comprises a sampling inner pipe (2) and a sampling outer pipe (3) which are coaxially arranged, a first male thread and a second male thread are formed at one end, connected with the sampling pipe body, of the adapter (1), the first male thread and the second male thread are respectively located on two sides of an outlet of the side air duct (12), the first male thread is connected with one end of the sampling outer pipe (3), the second male thread is connected with one end of the sampling inner pipe (2), and the outer diameter of the sampling inner pipe (2) is smaller than the inner diameter of the sampling outer pipe (3).
4. The coal mine underground double-pipe sampling device according to claim 2, wherein the drill bits comprise an inner pipe drill bit (4) and an outer pipe drill bit (5), the inner pipe drill bit (4) is connected with the other end of the sampling inner pipe (2), the outer pipe drill bit (5) is connected with the other end of the sampling outer pipe (3), and the outer diameter of the inner pipe drill bit (4) is smaller than the inner diameter of the outer pipe drill bit (5).
5. The dual tube sampling device for coal mine downhole according to claim 2, wherein the plugging ball (7) is a plastic ball.
6. The coal mine underground double-pipe sampling device according to claim 2, wherein the ball seat (6), the adapter (1), the sampling inner pipe (2) and the sampling outer pipe (3) are coaxial in axis.
7. The coal mine underground double-pipe sampling device according to claim 4, wherein the outer pipe drill bit (5) is in threaded connection with the sampling outer pipe (3), and the inner pipe drill bit (4) is in threaded connection with the sampling inner pipe (2).
8. The coal mine underground double-pipe sampling device according to claim 4, wherein cutting teeth are uniformly distributed on one ends of the inner pipe drill bit (4) and the outer pipe drill bit (5) far away from the adapter (1) along the circumferential direction of the inner pipe drill bit and the outer pipe drill bit.
9. The dual tube coal mine downhole sampling device of claim 8, wherein the cutting teeth are made of an alloy material.
10. The dual tube sampling device for coal mine downhole according to claim 2, wherein the ball seat (6) is in threaded connection with the adapter (1).
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| CN202123174032.8U CN216517978U (en) | 2021-12-16 | 2021-12-16 | Double-tube sampling device for underground coal mine |
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| CN202123174032.8U CN216517978U (en) | 2021-12-16 | 2021-12-16 | Double-tube sampling device for underground coal mine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278282A (en) * | 2021-12-16 | 2022-04-05 | 淮南矿业(集团)有限责任公司 | Double-pipe sampling device and method for underground coal mine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278282A (en) * | 2021-12-16 | 2022-04-05 | 淮南矿业(集团)有限责任公司 | Double-pipe sampling device and method for underground coal mine |
| CN114278282B (en) * | 2021-12-16 | 2024-05-10 | 淮南矿业(集团)有限责任公司 | Double-pipe sampling device and method for underground coal mine |
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