CN210396798U - Gas collecting device for extraction drilling of extremely soft coal seam - Google Patents
Gas collecting device for extraction drilling of extremely soft coal seam Download PDFInfo
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- CN210396798U CN210396798U CN201921227334.7U CN201921227334U CN210396798U CN 210396798 U CN210396798 U CN 210396798U CN 201921227334 U CN201921227334 U CN 201921227334U CN 210396798 U CN210396798 U CN 210396798U
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- 239000003245 coal Substances 0.000 title claims abstract description 55
- 238000000605 extraction Methods 0.000 title claims abstract description 18
- 238000005553 drilling Methods 0.000 title abstract description 23
- 238000012544 monitoring process Methods 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005086 pumping Methods 0.000 description 21
- 238000007599 discharging Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 9
- 239000007921 spray Substances 0.000 description 7
- 239000011435 rock Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 239000002817 coal dust Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a gas collecting device for extraction drilling of an extremely soft coal seam, which comprises a gas collecting barrel body and a drainage short pipe, wherein the gas collecting barrel body comprises an upper semicircular barrel body and a lower semicircular arc plate, and the upper semicircular barrel body and the lower semicircular arc plate are oppositely arranged and detachably connected; the upper semicircular cylinder comprises an inner arc plate and an outer arc plate, the inner arc plate, the outer arc plate, the two arc connecting plates and the two rectangular connecting plates enclose an air chamber, a plurality of air suction holes are formed in the inner arc plate, a gas concentration monitoring port is formed in the outer surface of the drainage short pipe and is connected with a gas concentration monitor, and a screen is arranged at the connecting position of the inner part of the drainage short pipe and the outer surface of the outer arc plate; the other end of the short drainage pipe is communicated with the gas drainage device through a drainage pipeline. The gas jet nozzle is convenient to mount and dismount, can effectively reduce the gas concentration when the jet holes are formed, and can ensure the gas extraction effect by secondarily separating coal powder and gas.
Description
Technical Field
The utility model relates to a gas collection device specifically is a gas collection device that is used for drilling is taken out and adopt in extremely soft coal seam.
Background
The coal bed refers to a layered solid combustible mineral product formed by transforming plant remains through complex biochemical and geological actions. It is present in the coal-bearing rock series and is located between the top and bottom rock. In the coal mining process, a drilling machine is required to perform drilling, but in some cases, during or after the drilling construction, a phenomenon of continuously ejecting coal slag and gas from a drill hole in a short time is caused, and the phenomenon is called drilling and spraying holes. The gas concentration in the tunnel can be abnormally increased by a large amount of gas sprayed out of the drill hole in a short time, so that the personal safety of underground constructors is endangered.
At present, in a coal mine site, a device for preventing spray holes has some applications, for example, a Chinese patent with the application number of 201510923415.0 proposes a spray hole preventing and well drilling device, and the device uses water to settle sprayed coal slag so as to separate gas from slag; also, for example, in the chinese patent No. 201220699879.X, a mixture of coal slag and gas is collected in a slag discharge cylinder, and the gas is pumped out by using gas extraction equipment, but these devices have a function of preventing injection holes, but the devices and processes are too complicated, and the method is poor in use effect because pulverized coal is not easily settled for an extremely soft coal seam. At present, in some coal mines, due to geological movement, the coal seam fluctuates greatly, and in addition, the coal seam hardness is low, so that the coal seam is very easy to form powder, and when a hole is drilled, the hole spraying phenomenon can happen on a drill rod once the coal is seen under the action of high gas pressure, and the drilling is very serious. And above-mentioned prevent orifice device can't in time handle spun buggy and gas to will lead to blockking up the pump drainage pipeline of device, more serious can make the device withdraw from in the drilling, influence the construction process. In addition, the above-mentioned device needs to be installed at the initial stage of drilling, which causes inconvenience in installation and removal after use.
In summary, the existing spray hole prevention device cannot solve the problem that the gas concentration is abnormally increased due to spray holes in a high-gas extremely-soft coal seam.
Disclosure of Invention
Problem to above-mentioned prior art exists, the utility model provides a gas collecting device for drilling is taken out and adopt in extremely soft coal seam, simple structure, the installation and dismantle conveniently, can effectively reduce the gas concentration when the orifice takes place, can guarantee the effect of taking out and adopt of gas to buggy and gas secondary separation simultaneously, finally guarantee the personnel safety in the tunnel.
In order to realize the purpose, the utility model discloses a technical scheme is: a gas collecting device for an extraction drill hole of an extremely soft coal seam comprises a gas collecting cylinder body and a drainage short pipe,
the gas collecting cylinder comprises an upper semicircular cylinder body and a lower semicircular arc plate, the upper semicircular cylinder body and the lower semicircular arc plate are oppositely arranged and detachably connected, so that a drill rod through hole is formed between the upper semicircular cylinder body and the lower semicircular arc plate, and the outer surface of the upper semicircular cylinder body and the outer surface of the lower semicircular arc plate are both provided with fixed mounting holes;
the upper semicircular cylinder body comprises an inner arc plate and an outer arc plate, the inner arc plate and the outer arc plate are arranged concentrically, the inner arc plate and the outer arc plate are fixedly connected through two arc connecting plates and two rectangular connecting plates, so that the inner arc plate, the outer arc plate, the two arc connecting plates and the two rectangular connecting plates enclose an air chamber, a plurality of air suction holes are formed in the inner arc plate, one end of a drainage short pipe is fixed on the outer surface of the outer arc plate and communicated with the air chamber, a drainage valve is arranged in the drainage short pipe, a gas concentration monitoring port is arranged on the outer surface of the drainage short pipe between the drainage valve and the air chamber and connected with a gas concentration monitor, and a screen is arranged at the connection part between the inner part of the drainage short pipe and the outer surface of the outer arc plate; the other end of the short drainage pipe is communicated with the gas drainage device through a drainage pipeline.
Furthermore, an L-shaped connector is arranged at the joint of the upper semicircular cylinder and the lower semicircular arc plate, and the upper semicircular cylinder and the lower semicircular arc plate are relatively fixed through the L-shaped connector. The L-shaped connecting port is convenient for assembling and disassembling the upper semicircular cylinder and the lower semicircular arc plate.
Furthermore, the number of the pumping and discharging short pipes is two, and the two pumping and discharging short pipes are symmetrically arranged on the outer surface of the outer circular arc plate. Two gas pumping and discharging amounts can be increased, and therefore the blowout prevention hole effect of the device is guaranteed.
Compared with the prior art, the utility model adopts the combination of the gas collecting cylinder, the short drainage pipe, the drainage pipeline and the gas drainage device, firstly adopts the drill bit I with larger diameter to form the drill hole I, then, the gas collecting device is installed in the drill hole I after the drill bit II with a smaller diameter continues to drill for a certain distance in the drill hole I, the drill rod drives the drill bit II to continue to drill in a drill rod through hole in the middle of the gas collecting device, when the drill rod drills into an extremely soft coal seam and a spray hole phenomenon occurs, the drill rod is stopped to drill, then the gas pumping and discharging device and the pumping and discharging valve are opened to form negative pressure in the gas chamber, and at the moment, the coal powder and the gas sprayed out of the extremely soft coal layer reach the upper semicircular cylinder body, gas enters the gas chamber through the air extraction hole, most of coal powder is discharged from the through hole of the drill rod, and a small part of coal powder enters the gas chamber along with the gas, so that primary coal powder and gas are separated; then the gas and the coal powder in the gas chamber move to the drainage short pipe under the influence of negative pressure, after being filtered by the screen, the gas reaches the gas drainage device through the drainage short pipe and the drainage pipeline, and the coal powder is left in the gas chamber, thereby completing the secondary separation process of the gas and the coal powder; in the continuous working process of the gas collecting device, the gas concentration detector monitors the gas concentration in the short extraction pipe in real time through the gas concentration monitoring port, and when the monitored gas concentration value is lower than a set safety value, the gas pumping and discharging device stops working and the pumping and discharging valve is closed; therefore the utility model has the advantages of simple structure, the installation and dismantle conveniently, can effectively reduce the gas concentration when the orifice takes place, can guarantee the effect of taking out of gas to buggy and gas secondary separation simultaneously, finally guarantee the personal safety in the tunnel.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a left side view of the exhaust line and gas pumping arrangement of FIG. 1 with the exhaust line and gas pumping arrangement removed;
FIG. 3 is a top view of the gas pumping arrangement of FIG. 1 with the pumping line and gas pumping arrangement removed;
fig. 4 is a schematic structural view of the middle-upper semicircular cylinder of the present invention.
In the figure: 1. the gas concentration monitoring port is connected with the gas concentration monitoring port, and the gas concentration monitoring port is connected with the gas concentration monitoring port through the gas concentration monitoring port.
Detailed Description
The present invention will be further explained below.
As shown in the drawing, the patent description is carried out by taking the upper part as the upper part and the lower part as the lower part of the figure 1, the gas collecting device for the extraction drill hole of the extremely soft coal seam comprises a gas collecting cylinder body and a drainage short pipe 6,
the gas collecting cylinder comprises an upper semicircular cylinder body 10 and a lower semicircular plate 1, the upper semicircular cylinder body 10 and the lower semicircular plate 1 are oppositely arranged and detachably connected, so that a drill rod through hole is formed between the upper semicircular cylinder body 10 and the lower semicircular plate 1, and the outer surface of the upper semicircular cylinder body 10 and the outer surface of the lower semicircular plate 1 are respectively provided with a fixed mounting hole 9;
the upper semicircular cylinder 10 comprises an inner arc plate 10.1 and an outer arc plate 10.2, the inner arc plate 10.1 and the outer arc plate 10.2 are concentrically arranged, the inner arc plate 10.1 and the outer arc plate 10.2 are fixedly connected through two arc connecting plates 10.3 and two rectangular connecting plates 10.3, so that the inner arc plate 10.1, the outer arc plate 10.2, the two arc connecting plates 10.3 and the two rectangular connecting plates 10.4 form an air chamber 10.5 in a surrounding manner, the inner arc plate 10.1 is provided with a plurality of air suction holes 12, one end of a short suction pipe 6 is fixed on the outer surface of the outer arc plate 10.2 and is communicated with the air chamber 10.5, a suction valve 5 is arranged in the short suction pipe 6, a gas concentration monitoring port 4 is arranged on the outer surface of the short suction pipe 6 between the suction valve 5 and the air chamber 10.5, the gas concentration monitoring port 4 is connected with a gas concentration monitor, and a screen 3 is arranged at the connection position between the inner part of the suction pipe 6 and the outer surface of the outer; the other end of the short drainage pipe 6 is communicated with a gas drainage device 8 through a drainage pipeline 7.
The gas pumping and discharging device 8 and the gas concentration detector are both existing equipment
Furthermore, an L-shaped connector 2 is arranged at the joint of the upper semicircular cylinder 10 and the lower semicircular plate 1, and the upper semicircular cylinder 10 and the lower semicircular plate 1 are relatively fixed through the L-shaped connector 2.
Furthermore, the number of the short drainage pipes 6 is two, and the two short drainage pipes 6 are symmetrically arranged on the outer surface of the outer circular arc plate 10.2.
The using method of the gas collecting device comprises the following specific steps:
A. firstly, exploring a pre-extracted extremely soft coal seam, and determining the distance between a tunnel wall on one side of a hole to be drilled and the extremely soft coal seam;
B. connecting a drill bit I with the diameter of 114 mm-143 mm on the drill rod 11, drilling from the roadway wall to the extremely soft coal seam, forming a drill hole I with the drilling depth of 1 m-1.5 m, and withdrawing the drill bit I; the specific depth of the drilled hole is determined by kinetic energy of high-pressure gas and coal powder, if the depth of the drilled hole is too shallow, the gas cannot be pumped into the gas chamber 10.5 and is ejected out of the gas collecting barrel, so that the gas concentration of a roadway exceeds the standard, or if the depth of the drilled hole is too deep, the coal powder is accumulated in the gas collecting barrel, so that the normal work of the device is influenced;
C. replacing a drill bit II with a connecting drill bit of 75-94 mm in diameter by a drill rod 11, then extending into a drill hole I to continue drilling towards the extremely soft coal seam, stopping drilling when the drilling depth is close to the distance between the roadway wall and the extremely soft coal seam obtained by exploration, sequentially inserting an upper semicircular cylinder 10 and a lower semicircular arc plate 1 into the drill hole I, forming a gas collecting cylinder by the two through an L-shaped connecting port 2, fixedly connecting the gas collecting cylinder with the roadway wall through a fixed mounting hole 9 by a rivet, and preventing the gas collecting cylinder from sliding out of the drill hole in the using process to prevent the gas collecting cylinder from being incapable of being used continuously; finally, the gas concentration monitoring port 4 is connected with a gas concentration monitor, and the extraction short pipe 6 is communicated with a gas pumping and discharging device 8 by adopting a pumping and discharging pipeline 7;
D. after the installation of the gas collecting device is completed, the drill rod 11 is made to continuously drill into the extremely soft coal bed in a drill rod through hole formed between the upper semicircular cylinder 10 and the lower semicircular plate 1, when the drill rod 11 drills into the extremely soft coal bed and a hole spraying phenomenon occurs, the drilling of the drill rod 11 is stopped, then the gas pumping and discharging device 8 and the pumping and discharging valve 5 are opened, so that negative pressure is formed in the gas chamber 10.5, at the moment, coal dust and gas sprayed out of the extremely soft coal bed reach the upper semicircular cylinder 10, the gas can enter the gas chamber 10.5 through the air pumping hole 12, most of the coal dust can be discharged from the drill rod through hole, and a small part of the coal dust can enter the gas chamber 10.5 along with the gas through the air pumping hole 12, so that the primary separation; then the gas and the coal powder in the air chamber 10.5 move to the short drainage pipe 6 under the influence of negative pressure, after being filtered by the screen 3, the gas reaches a gas drainage device 8 through the short drainage pipe 6 and a drainage pipeline 7, and the coal powder is left in the air chamber 10.5, thereby completing the secondary separation process of the gas and the coal powder; in the continuous working process of the gas collecting device, the gas concentration detector monitors the gas concentration in the extraction short pipe 6 in real time through the gas concentration monitoring port 4, and when the monitored gas concentration value is lower than a set safety value, the gas pumping and discharging device 8 is stopped to work and the pumping and discharging valve 5 is closed;
E. d, continuing drilling the drill rod 11, and repeating the step D if the hole spraying phenomenon occurs again until the drill rod reaches the required drilling depth;
F. after the drill rod 11 completes the construction of the drill hole, the gas collecting device is detached from the drill hole I, the coal powder in the gas chamber is cleaned to prepare for the next drill hole, and finally the drill rod 11 is withdrawn from the drill hole I;
G. and D, repeating the steps A to F on the wall of the roadway, performing the construction of the next drilling hole, and circulating the steps until the drilling construction process of the whole roadway wall is completed.
The test proves that:
test 1: the device is installed in a No. 1-1 drill hole of a No. 2254 west baseplate lane of Jiang He mining Co Ltd of coal industry group in Hunan province, the azimuth of the No. 1 drill hole is 282 degrees, the inclination angle is 53 degrees, the length is 30m, the length of a rock hole is 23.5m, the length of the coal hole is 6m, the extraction negative pressure is 20Kpa, the hole diameter of the drill hole is 75mm, the rock entering depth of the device is 1m, the diameter of a used drill bit I is 127mm, a spray hole is formed after a drill bit II sees coal, a gas extraction device is started, the concentration of extracted gas of the device is 91.2% through a gas concentration monitor, the amount of the gas sprayed into the lane is effectively.
Test 2: the device is installed in a No. 3-1 drill hole of a No. 2254 west bottom plate lane of Jiang He mining Co Ltd of coal industry group of Jian province in Hunan province, the azimuth of the No. 1-1 drill hole is 282 degrees, the inclination angle is 53 degrees, the length is 34.5m, the length of a rock hole is 24.9m, the length of the coal hole is 9.1m, the extraction negative pressure is 20Kpa, the hole diameter of the drill hole is 87mm, the rock entering depth of the device is 1.3m, the diameter of a used drill bit I is 132mm, a spray hole is formed after a drill bit II sees coal, a gas extraction device is started, the concentration of the extracted gas of the device is observed to be 90.5% through a gas concentration monitor.
Claims (3)
1. A gas collecting device for an extraction drill hole of an extremely soft coal seam is characterized by comprising a gas collecting cylinder body and a drainage short pipe (6),
the gas collecting cylinder comprises an upper semicircular cylinder body (10) and a lower semicircular plate (1), the upper semicircular cylinder body (10) and the lower semicircular plate (1) are oppositely arranged and detachably connected, a drill rod through hole is formed between the upper semicircular cylinder body (10) and the lower semicircular plate (1), and the outer surface of the upper semicircular cylinder body (10) and the outer surface of the lower semicircular plate (1) are both provided with fixed mounting holes (9);
the upper semicircular cylinder body (10) comprises an inner arc plate (10.1) and an outer arc plate (10.2), the inner arc plate (10.1) and the outer arc plate (10.2) are concentrically arranged, the inner arc plate (10.1) and the outer arc plate (10.2) are fixedly connected through two arc connecting plates (10.3) and two rectangular connecting plates (10.3), so that an air chamber (10.5) is formed by enclosing the inner arc plate (10.1), the outer arc plate (10.2), the two arc connecting plates (10.3) and the two rectangular connecting plates (10.4), the inner arc plate (10.1) is provided with a plurality of air suction holes (12), one end of a drainage short pipe (6) is fixed on the outer surface of the outer arc plate (10.2) and communicated with the air chamber (10.5), a drainage valve (5) is arranged in the drainage short pipe (6), a gas concentration monitoring port (4) is arranged on the outer surface of the drainage short pipe (6) between the drainage valve (5) and the air chamber (10.5), and the gas concentration monitoring port (4) is connected with the gas concentration monitoring port (4), a screen (3) is arranged at the joint of the inner part of the drainage short pipe (6) and the outer surface of the outer circular arc plate (10.2); the other end of the short drainage pipe (6) is communicated with a gas drainage device (8) through a drainage pipeline (7).
2. The gas collecting device for the extraction drill hole of the extremely soft coal seam according to claim 1, wherein an L-shaped connector (2) is arranged at the joint of the upper semicircular cylinder (10) and the lower semicircular plate (1), and the upper semicircular cylinder (10) and the lower semicircular plate (1) are relatively fixed through the L-shaped connector (2).
3. The gas collecting device for the extraction drill hole of the extremely soft coal seam according to claim 1, wherein the number of the drainage short pipes (6) is two, and the two drainage short pipes (6) are symmetrically arranged on the outer surface of the outer circular arc plate (10.2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921227334.7U CN210396798U (en) | 2019-07-31 | 2019-07-31 | Gas collecting device for extraction drilling of extremely soft coal seam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921227334.7U CN210396798U (en) | 2019-07-31 | 2019-07-31 | Gas collecting device for extraction drilling of extremely soft coal seam |
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| Publication Number | Publication Date |
|---|---|
| CN210396798U true CN210396798U (en) | 2020-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921227334.7U Expired - Fee Related CN210396798U (en) | 2019-07-31 | 2019-07-31 | Gas collecting device for extraction drilling of extremely soft coal seam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374665A (en) * | 2019-07-31 | 2019-10-25 | 湖南科技大学 | A kind of gas collection device and application method for pole weak seam extraction borehole |
-
2019
- 2019-07-31 CN CN201921227334.7U patent/CN210396798U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374665A (en) * | 2019-07-31 | 2019-10-25 | 湖南科技大学 | A kind of gas collection device and application method for pole weak seam extraction borehole |
| CN110374665B (en) * | 2019-07-31 | 2024-03-19 | 湖南科技大学 | Gas collection device for extraction drilling of extremely soft coal seam and use method |
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Granted publication date: 20200424 |
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