CN214464159U - Coal mine wall protection type drilling and phase change cracking device - Google Patents
Coal mine wall protection type drilling and phase change cracking device Download PDFInfo
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- CN214464159U CN214464159U CN202120458921.8U CN202120458921U CN214464159U CN 214464159 U CN214464159 U CN 214464159U CN 202120458921 U CN202120458921 U CN 202120458921U CN 214464159 U CN214464159 U CN 214464159U
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Abstract
The utility model discloses a coal mine dado drilling and phase transition send device that splits, including the body of rod, the release pipe, the conducting rod, fill the dress valve, heating pipe and level pressure energy release piece, the minor diameter drilling of construction through the body of rod and the spiral tooth of release pipe surface is to setting for the degree of depth earlier, then fill the liquid carbon dioxide of dress valve injection in the stock solution intracavity, transmit the electric current to the heating pipe through the conducting rod after accomplishing, after the heating pipe begins to heat, the liquid carbon dioxide in the stock solution intracavity takes place phase transition reaction and turns into carbon dioxide gas in the twinkling of an eye, the carbon dioxide gas that generates can increase the pressure in the stock solution intracavity, lead to level pressure energy release piece pressurized and open in the twinkling of an eye, then reentrant release pipe and release all gas that convert from the water conservancy diversion hole, carbon dioxide gas strikes the fracture to the coal rock mass around the drilling this moment, the release scope of this drilling has finally effectively been increased, meanwhile, the coal wall can be prevented from being damaged by instability.
Description
Technical Field
The utility model relates to a colliery dado drilling and phase transition send device that splits belongs to colliery release technical field.
Background
With the large-scale deep mining of coal resources in China, the frequency and the strength of rock burst are increased day by day. The exploration of rock burst prevention and control theory under deep mining conditions and the implementation method thereof are gradually concerned by scholars and engineering technicians at home and abroad. At present, the main treatment technologies of rock burst include adjacent layer mining pressure relief, construction pressure relief drilling, pressure relief groove method, loosening blasting method, excavation pressure relief roadway or chamber method, cross mining method and the like. Although the method relieves the harm of rock burst to the safety production of coal mines to a certain extent, the method has the main problems that firstly, under the influence of the increase of the mining depth of the mines, the mines with protective layers are fewer and fewer, so the method has no universal applicability; secondly, drilling pressure relief is a coal seam pressure relief method generally adopted by a current mine, and the method is characterized by simple construction process and high safety, but the range of drilling pressure relief in each construction is small, and large-scale drilling can face the problems of high drilling cost, slow construction progress and the like. At present, large-diameter drilling holes (namely, the hole diameter is 120 mm-150 mm, the drilling depth is 15m, and the hole spacing is 1-3 m) are usually adopted for carrying out advanced pressure relief (namely, the ground stress is transferred from the front coal rock body after the drilling holes), so that the condition of rock burst in front of a working face is prevented. However, the high-density and large-diameter drill holes often damage the coal wall in front of the working face, so that the anchor rods for supporting the coal wall lose the stable anchoring ends, the anchor net supporting system fails, the coal wall of the mining roadway is finally damaged unstably, and the normal production of the working face is seriously influenced. Therefore, how to increase the pressure relief range during drilling each time and prevent the coal wall from being unstably damaged is the research direction of the industry.
Disclosure of Invention
To the problem that above-mentioned prior art exists, the utility model provides a colliery dado drilling and phase transition send the device that splits sends the mode that splits the combination through colliery dado drilling and phase transition, can increase the release range when drilling at every turn, can prevent the circumstances that the unstability destroys from appearing in the coal wall simultaneously.
In order to realize the purpose, the utility model discloses a technical scheme is: a coal mine wall protection type drilling and phase change fracturing device comprises a rod body, a release pipe, a conductive rod, a filling valve, a heating pipe and a constant pressure energy release sheet;
the outer surface of the rod body and the outer surface of the release pipe are both provided with spiral teeth, the spiral teeth are used for construction drilling, a liquid storage cavity is arranged in the rod body, two ends of the rod body are respectively provided with a liquid inlet hole and an air jet, the liquid inlet hole and the air jet are both communicated with the liquid storage cavity, the heating pipe is arranged in the liquid storage cavity, the filling valve is arranged at the liquid inlet hole, and one end of the conductive rod extends into the liquid storage cavity through the filling valve and is connected with the heating pipe; liquid carbon dioxide is filled in the liquid storage cavity;
the release pipe is internally provided with an air injection channel, one end of the release pipe is provided with an air inlet, the other end of the release pipe is provided with a drill bit, the air inlet is communicated with the air injection channel, the outer surface of the release pipe is provided with a plurality of flow guide holes, the flow guide holes are communicated with the air injection channel, the release pipe is coaxially connected with the rod body, and the air inlet is aligned with the air injection port; the constant-pressure energy release sheet is arranged between the air inlet and the air jet and used for releasing carbon dioxide gas in the liquid storage cavity into the release pipe at constant pressure.
Furthermore, the constant-pressure energy release sheet comprises two sealing gaskets and a shearing sheet, the shearing sheet is positioned between the two sealing gaskets, and the two sealing gaskets are respectively in compression contact with the air inlet and the air jet. When liquid carbon dioxide in the liquid storage cavity generates a phase change reaction to generate carbon dioxide gas, the internal air pressure of the liquid carbon dioxide is further increased, the carbon dioxide gas is applied to the shearing sheet to be damaged by larger shearing force, and the generated carbon dioxide gas is discharged to enter the release pipe. By adopting the structure, the leakage of liquid carbon dioxide in the liquid storage cavity is prevented, meanwhile, the two sealing gaskets prevent air leakage and protect the shear blade from being damaged by extrusion, and the shear blade also plays a role in sealing and releasing carbon dioxide gas.
Further, the diameter of the rod body and the diameter of the release pipe do not exceed 80 mm.
Further, the sealing gasket is made of rubber.
Compared with the prior art, the utility model adopts the combination of the rod body, the release pipe, the current-conducting rod, the charging valve, the heating pipe and the constant pressure energy-releasing sheet, firstly, the small-diameter drilling is carried out to the set depth through the spiral teeth on the outer surfaces of the rod body and the release pipe, then liquid carbon dioxide is injected into the liquid storage cavity through the filling valve, after the liquid carbon dioxide is filled, the current is transmitted to the heating pipe through the conducting rod, after the heating pipe starts to heat, liquid carbon dioxide in the liquid storage cavity is subjected to phase change reaction and is instantly converted into carbon dioxide gas, the pressure in the tube reaches 160-180 MPa as the generated carbon dioxide gas is converted into gas, the volume is instantly expanded by 600 times, so that the constant-pressure energy-releasing piece is instantly opened under pressure, then the gas enters the release pipe and releases all converted gas from the diversion holes, and at the moment, the carbon dioxide gas impacts and cracks the coal rock mass around the drill hole, so that the pressure relief range of the drill hole is effectively enlarged finally. Consequently the utility model discloses a colliery dado drilling and the phase transition send the mode that splits and combine, the release range when can increasing drilling at every turn can prevent that the condition of unstability destruction from appearing in the coal wall simultaneously.
Drawings
FIG. 1 is a schematic construction diagram of the present invention;
fig. 2 is a schematic view of the present invention in fig. 1, with a split structure;
FIG. 3 is a schematic structural view of the gasket of the present invention;
fig. 4 is a schematic structural diagram of the middle shear slice of the present invention.
In the figure: 1. the device comprises a conductive rod, 2, a filling valve, 3, a liquid inlet hole, 4, a heating pipe, 5, a rod body, 6, a liquid storage cavity, 7, a constant pressure energy release sheet, 7-1, a sealing gasket, 7-2, a shear sheet, 8, an air injection channel, 9, a release pipe, 10, a drill bit, 11 and a flow guide hole.
Detailed Description
The present invention will be further explained below.
As shown in fig. 1 to 4, a coal mine retaining wall type drilling and phase transition fracturing device comprises a rod body 5, a release pipe 9, a conductive rod 1, a charging valve 2, a heating pipe 4 and a constant pressure energy release sheet 7;
the outer surface of the rod body 5 and the outer surface of the release pipe 9 are both provided with spiral teeth, the spiral teeth are used for construction drilling, a liquid storage cavity 6 is arranged inside the rod body 5, a liquid inlet hole 3 and an air jet are respectively formed in two ends of the rod body 5, the liquid inlet hole 3 and the air jet are both communicated with the liquid storage cavity 6, the heating pipe 4 is arranged in the liquid storage cavity 6, the filling valve 2 is arranged at the liquid inlet hole 3, and one end of the conductive rod 1 extends into the liquid storage cavity 6 through the filling valve 2 to be connected with the heating pipe 4; liquid carbon dioxide is filled in the liquid storage cavity 6;
an air injection channel 8 is arranged in the release pipe 9, one end of the release pipe 9 is provided with an air inlet, the other end of the release pipe 9 is provided with a drill bit, the air inlet is communicated with the air injection channel 8, the outer surface of the release pipe 9 is provided with a plurality of flow guide holes 11, the flow guide holes 11 are all communicated with the air injection channel 8, the release pipe 9 is coaxially connected with the rod body 5, and the air inlet is aligned with an air injection port; the constant pressure energy release sheet 7 is arranged between the air inlet and the air jet and is used for releasing the carbon dioxide gas in the liquid storage cavity 6 into the release pipe 9 under constant pressure.
Further, the constant-pressure energy-releasing sheet 7 comprises two sealing gaskets 7-1 and a shearing sheet 7-2, the shearing sheet 7-2 is positioned between the two sealing gaskets 7-1, and the two sealing gaskets 7-1 are respectively in compression contact with the air inlet and the air outlet. When the liquid carbon dioxide in the liquid storage cavity 6 is subjected to phase change reaction to generate carbon dioxide gas, the internal air pressure is further increased, the carbon dioxide gas is applied to the shear blade 7-2 to be damaged by large shearing force, and the generated carbon dioxide gas is discharged into the release pipe 9. By adopting the structure, the leakage of liquid carbon dioxide in the liquid storage cavity 6 is prevented, meanwhile, the two sealing gaskets 7-1 prevent air leakage and protect the shearing sheet 7-2 from being damaged by extrusion, and the shearing sheet 7-2 also plays a role in sealing and releasing carbon dioxide gas.
Further, the diameters of the rod body 5 and the release pipe 9 are not more than 80 mm.
Further, the sealing gasket 7-1 is made of rubber.
The utility model discloses a concrete working procedure does:
A. connecting a rod body 5 of the coal mine wall-protecting type drilling and phase change cracking device with a drilling machine, then performing drilling operation on a selected position, stopping drilling after a set depth is reached, and separating the drilling machine from the rod body 5;
B. connecting the filling valve 2 with a liquid carbon dioxide storage tank, injecting liquid carbon dioxide into the liquid storage cavity 6 through the liquid injection hole 3, closing the filling valve 2 after a set amount is reached, and then connecting the conductive rod 1 with the current control switch through a lead to complete the preparation work of phase change cracking;
C. closing a current control switch to enable current to reach a heating pipe 4 through a conductive rod 1, enabling the heating pipe 4 to start heating work, further enabling liquid carbon dioxide in a liquid storage cavity 6 to be heated and phase-changed to generate carbon dioxide gas along with the rise of temperature, enabling the air pressure in the liquid storage cavity 6 to rise rapidly until the internal pressure exceeds a constant pressure energy release sheet 7 opening critical value, enabling the carbon dioxide gas to enter an air injection channel 8 of a release pipe 9 at the moment, finally ejecting the carbon dioxide gas from each flow guide hole 11 of the release pipe 9, enabling the carbon dioxide gas to impact and crack coal rock mass around a drill hole, and completing the process of wall protection type drilling and phase change cracking of the drill hole after the carbon dioxide gas lasts for a period of time;
D. and (4) switching off the current control switch, taking the coal mine bulkhead type drilling hole and the phase change fracturing device out of the drilling hole, repeating the steps from A to C, constructing the next drilling hole, and circulating the steps to finish the pressure relief work of the required coal mine.
Claims (4)
1. A coal mine wall protection type drilling and phase change fracturing device is characterized by comprising a rod body, a release pipe, a conductive rod, a filling valve, a heating pipe and a constant pressure energy release sheet;
the outer surface of the rod body and the outer surface of the release pipe are both provided with spiral teeth, a liquid storage cavity is arranged in the rod body, a liquid inlet hole and an air jet are respectively formed in two ends of the rod body, the liquid inlet hole and the air jet are both communicated with the liquid storage cavity, the heating pipe is arranged in the liquid storage cavity, the filling valve is arranged at the liquid inlet hole, and one end of the conductive rod extends into the liquid storage cavity through the filling valve and is connected with the heating pipe; liquid carbon dioxide is filled in the liquid storage cavity;
the release pipe is internally provided with an air injection channel, one end of the release pipe is provided with an air inlet, the other end of the release pipe is provided with a drill bit, the air inlet is communicated with the air injection channel, the outer surface of the release pipe is provided with a plurality of flow guide holes, the flow guide holes are communicated with the air injection channel, the release pipe is coaxially connected with the rod body, and the air inlet is aligned with the air injection port; the constant-pressure energy release sheet is arranged between the air inlet and the air jet and used for releasing carbon dioxide gas in the liquid storage cavity into the release pipe at constant pressure.
2. The coal mine bulkhead drilling and phase change fracturing device of claim 1, wherein the constant pressure energy release sheet comprises two sealing gaskets and a shear sheet, the shear sheet is arranged between the two sealing gaskets, and the two sealing gaskets are respectively in compression contact with the air inlet and the air outlet.
3. The coal mine bulkhead drilling and phase change fracturing device of claim 1, wherein the diameter of the rod body and the diameter of the release pipe are not more than 80 mm.
4. The coal mine retaining wall drilling and phase transition fracturing device of claim 2, wherein the sealing gasket is made of rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120458921.8U CN214464159U (en) | 2021-03-03 | 2021-03-03 | Coal mine wall protection type drilling and phase change cracking device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120458921.8U CN214464159U (en) | 2021-03-03 | 2021-03-03 | Coal mine wall protection type drilling and phase change cracking device |
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| CN214464159U true CN214464159U (en) | 2021-10-22 |
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| CN202120458921.8U Active CN214464159U (en) | 2021-03-03 | 2021-03-03 | Coal mine wall protection type drilling and phase change cracking device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112922597A (en) * | 2021-03-03 | 2021-06-08 | 湖南科技大学 | Coal mine wall protection type drilling and phase change fracturing device and working method thereof |
| CN116147439A (en) * | 2022-09-09 | 2023-05-23 | 石家庄铁道大学 | Carbon dioxide blasting device and method |
-
2021
- 2021-03-03 CN CN202120458921.8U patent/CN214464159U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112922597A (en) * | 2021-03-03 | 2021-06-08 | 湖南科技大学 | Coal mine wall protection type drilling and phase change fracturing device and working method thereof |
| CN116147439A (en) * | 2022-09-09 | 2023-05-23 | 石家庄铁道大学 | Carbon dioxide blasting device and method |
| CN116147439B (en) * | 2022-09-09 | 2024-05-10 | 石家庄铁道大学 | Carbon dioxide blasting device and method |
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