CN211422588U - Grouting hole sealing equipment for coal seam gas extraction drilling - Google Patents
Grouting hole sealing equipment for coal seam gas extraction drilling Download PDFInfo
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- CN211422588U CN211422588U CN201921746973.4U CN201921746973U CN211422588U CN 211422588 U CN211422588 U CN 211422588U CN 201921746973 U CN201921746973 U CN 201921746973U CN 211422588 U CN211422588 U CN 211422588U
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Abstract
The utility model discloses a coal seam gas takes out and adopts drilling with slip casting hole sealing equipment, including slurrying device and slip casting hole sealing device, the slurrying device includes solidified material mechanism and mucus material mechanism, and solidified material mechanism is provided with solid material feed inlet, solid material storage silo, solidified material stirring storehouse, solidified material discharge bin and solidified material discharge gate; the viscose material mechanism is provided with a viscose material feeding port, a viscose material storage bin, a viscose material discharging bin and a viscose material discharging port; the grouting hole sealing device comprises a first grouting pipe, a second grouting pipe and a third grouting pipe, a grouting pump and a slurry automatic switching valve are arranged on the third grouting pipe, and the tail end of the third grouting pipe extends into the gas extraction drill hole. The utility model discloses compact structure can realize slurrying-slip casting integration effectively, can satisfy the demand of injecting into two kinds of different slip casting liquid of solidification material and mucus material in the single drilling simultaneously.
Description
Technical Field
The utility model belongs to the technical field of coal seam gas is taken out and is adopted, concretely relates to coal seam gas is taken out and is adopted drilling with slip casting hole sealing equipment.
Background
The gas extraction is an important measure for preventing and treating gas disaster accidents of coal mines, the drilled holes need to be sealed after the gas extraction is finished, and as the hole sealing section and the wall of the drilled hole or the surrounding rock expansion fracture of the drilled hole form a gas leakage channel, the extraction negative pressure of the hole opening at the later stage of the extraction is reduced sharply, the gas extraction effect is reduced, the effective extraction period of the drilled hole is shortened, and the gas extraction rate of the coal seam is seriously influenced, so that the quality of the gas extraction drilled hole sealing influences the gas extraction effect.
In the prior art, when drilling, grouting and hole sealing are carried out, the problems that grouting materials are single, the processes of pulping and grouting are separately carried out and the like exist, and when the composite material is used for grouting and hole sealing, equipment for simultaneously grouting and hole sealing by different materials cannot be realized. At present, when a coal mine is drilled and grouted, only a common mining grouting pump is used, the simultaneous pulping and grouting of composite materials cannot be realized, equipment for simultaneous grouting and hole sealing of different materials cannot be realized, and meanwhile, the grouting quantity cannot be guaranteed according to different grouting quantities of a hole sealing section. Therefore, in order to solve the integrated process of gas extraction drilling pulping-grouting, brand new sealing equipment and method are needed to be found out, and the sealing requirement of the underground high-quality drilling of the coal mine is met.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that not enough among the above-mentioned prior art is directed against, a coal seam gas is taken out and is adopted drilling and use slip casting hole sealing equipment is provided, its compact structure, novel in design is reasonable, slurrying-slip casting integration can be realized with slip casting hole sealing device's supporting setting to slurrying device, and simultaneously, the demand that single gas was taken out and is adopted drilling injection solidificated material and two kinds of different thick liquids of mucus material can be satisfied in setting up of solidificated material mechanism and mucus material mechanism, and work efficiency is high, therefore, the clothes hanger is strong in practicability, and is convenient for popularize and use.
In order to solve the technical problem, the utility model discloses a technical scheme is: a grouting and hole sealing device for coal bed gas extraction drilling comprises a pulping device and a grouting and hole sealing device;
the pulping device comprises a solidified material mechanism and a mucus material mechanism, wherein the solidified material mechanism comprises a solidified material preparation bin, a solid material feeding port arranged at the top of the solidified material preparation bin, a solid material storage bin, a solidified material stirring bin and a solidified material discharging bin which are sequentially arranged in the solidified material preparation bin from the top layer to the bottom layer, and a solidified material discharging port is arranged at the center of the bottom of the solidified material discharging bin; the viscose material mechanism comprises a viscose material preparation bin, a viscose material feeding port arranged at the top of the viscose material preparation bin, a viscose material storage bin and a viscose material discharging bin which are sequentially arranged in the viscose material preparation bin from the top layer to the bottom layer, and a viscose material discharging port is arranged at the center of the bottom of the viscose material discharging bin; the solidified material preparation bin and the mucus material preparation bin are arranged in parallel in the horizontal direction, a water injection pipe is arranged between the solidified material preparation bin and the mucus material preparation bin, and the water injection pipe is introduced into the solidified material stirring bin and the mucus material storage bin;
the grouting hole sealing mechanism comprises a grouting pipe and a grouting pump, the grouting pipe comprises a first grouting pipe connected with a solidified material discharge port, a second grouting pipe connected with a viscose material discharge port and a third grouting pipe, the third grouting pipe is connected with the tail end of the first grouting pipe and the tail end of the second grouting pipe, the grouting pump is arranged on the third grouting pipe, a slurry automatic switching valve used for automatically switching and conveying slurry is arranged at the joint of the third grouting pipe and the first grouting pipe and the second grouting pipe, a pressure gauge used for displaying a pressure value is further arranged on the third grouting pipe, and the tail end of the third grouting pipe extends into a gas extraction drill hole.
According to the grouting and hole sealing equipment for the coal bed gas extraction drill hole, a first slurry leakage plate and a first slurry baffle plate are arranged at the bottom of the solidified material stirring bin, the first slurry leakage plate is positioned above the first slurry baffle plate, a first weight sensor is arranged on the first slurry leakage plate, a stirring rod for stirring solid materials and water is rotatably connected to the center of the first slurry leakage plate, and a motor for driving the stirring rod to rotate is arranged on the first slurry leakage plate; the bottom of the viscose material storage bin is composed of a second slurry leaking plate and a second slurry blocking plate, the second slurry leaking plate is located above the second slurry blocking plate, and a second weight sensor is arranged on the second slurry leaking plate.
The grouting hole sealing equipment for the coal bed gas extraction drill hole comprises a long rod and a short rod, wherein the long rod and the short rod are 45 degrees, the long rod and the horizontal plane are 45 degrees, and the end part of the long rod is fixedly connected with the end part of the short rod and then fixedly connected with an output shaft of a motor.
The grouting hole sealing equipment for the coal bed gas extraction drill hole is characterized in that an umbrella-shaped material leaking shell and an umbrella-shaped material blocking shell are arranged at the bottom of the solid material storage bin, the material leaking shell and the bottom of the material blocking shell are connected and arranged at intervals, the material blocking shell is wrapped outside the material leaking shell, the material leaking shell is divided into even first fan-shaped sections by taking the bottom as the center of circle, one of the first fan-shaped sections is hollow, the material blocking shell is divided into even second fan-shaped sections by taking the bottom as the center of circle, and one of the second fan-shaped sections is hollow.
Foretell a coal seam gas drainage is slip casting hole sealing equipment for drilling, the top of solid material storage silo rotates and is connected with the scraper blade that is used for scraping the material, the scraper blade comprises 3 most advanced continuous arc limit scatter and shape for fan-shaped PVC hard board.
According to the grouting hole sealing equipment for the coal bed gas extraction drill hole, the bottom of the solidified material discharging bin is provided with the first arc-shaped sliding plate; and a second arc-shaped sliding plate is arranged at the bottom of the viscose material discharging bin.
Foretell a coal seam gas drainage is slip casting hole sealing equipment for drilling, be provided with mechanical automation controller on the outer wall in mucus material preparation storehouse, be provided with fluidflowmeter on the water injection pipe, be provided with the pressure sensor who is used for monitoring slip casting in-process slip casting pressure on the grouting pump, the output of first weight sensor, the output of second weight sensor, pressure sensor's output and fluidflowmeter's output all are connected with mechanical automation controller's input, thick liquid automatic switch valve and grouting pump all are connected with mechanical automation controller's output.
Compared with the prior art, the utility model has the following advantage:
1. the utility model discloses a slurrying-slip casting integration can be realized to the integration setting of slurrying device and slip casting hole sealing device, and simultaneously, the demand of injecting into two kinds of different thick liquids of solidification material and mucus material in single gas drainage drilling can be satisfied in setting up of solidification material mechanism and mucus material mechanism, and work efficiency is high, and the practicality is strong, convenient to popularize and use.
2. The utility model discloses a required solid material's weight can be detected in first weighing transducer's setting, through fluid flowmeter's setting, can control the volume of pouring into required water into, conveniently realizes the certain ratio of solid material and water.
3. The utility model discloses a pressure sensor real-time supervision gas takes out the volume of injecting the thick liquid in taking out the drilling to present the pressure value on the manometer, the slip casting personnel of being convenient for observe, can real-time supervision slip casting process.
To sum up, the utility model discloses compact structure, novel in design is reasonable, can realize slurrying-slip casting integration through slurrying device and slip casting hole sealing device's setting, and simultaneously, setting up of solidification material mechanism and mucus material mechanism can satisfy the demand that single gas was taken out and is taken out the drilling and pour into two kinds of different thick liquids of solidification material and mucus material, and work efficiency is high, and the practicality is strong, convenient to popularize and use.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the connection relationship between the leaking shell and the blocking shell;
FIG. 3 is a schematic structural view of the scraper of the present invention;
fig. 4 is a schematic view of the connection relationship between the mechanical automation controller and other units according to the present invention.
Description of reference numerals:
1-a solidified material preparation bin; 1-solid material feed inlet; 1-2-solid material storage bin;
1-21-leaking shell; 1-22-material blocking shell; 1-23 — first sector;
1-24-squeegee; 1-25-second sector;
1-3-solidified material stirring bin; 1-31-a first leakage plate;
1-32-first baffle; 1-33-a first weight sensor;
1-34-stirring rod; 1-35-long rod; 1-36-short bar;
1-4-a solidified material discharging bin;
1-41-a first arc-shaped sliding material plate;
1-5-a solidified material discharge port;
2, a mucus material preparation bin; 2-1-a viscous material feed port; 2-a viscous material storage bin;
2-21-second leakage board; 2-22-second baffle plate;
2-23 — a second weight sensor; 2-3-discharging the viscose material;
2-31-a second arc-shaped sliding material plate; 2-4-a discharge port for the viscous material;
3-water injection pipe; 3-1-liquid flow meter; 4-1 — a first slip casting pipe;
4-2-a second grouting pipe; 4-3-third slip casting pipe; 5-grouting pump;
6, gas extraction drilling; 7-slurry automatic switching valve; 8-a pressure sensor;
9-a pressure gauge; and 10, a mechanical automation controller.
Detailed Description
As shown in fig. 1, the utility model discloses a coal seam gas takes out and drills and uses slip casting hole sealing equipment, including slurrying device and slip casting hole sealing device;
the pulping device comprises a solidified material mechanism and a mucus material mechanism, wherein the solidified material mechanism comprises a solidified material preparation bin 1, a solid material feeding port 1-1 arranged at the top of the solidified material preparation bin 1, a solid material storage bin 1-2, a solidified material stirring bin 1-3 and a solidified material discharging bin 1-4 which are sequentially arranged in the solidified material preparation bin 1 from the top layer to the bottom layer, and a solidified material discharging port 1-5 is arranged at the central position of the bottom of the solidified material discharging bin 1-4; the viscose material mechanism comprises a viscose material preparation bin 2, a viscose material feeding port 2-1 arranged at the top of the viscose material preparation bin 2, a viscose material storage bin 2-2 and a viscose material discharging bin 2-3 which are sequentially arranged in the viscose material preparation bin 2 from the top layer to the bottom layer, and a viscose material discharging port 2-4 is arranged at the center of the bottom of the viscose material discharging bin 2-3; the solidified material preparation bin 1 and the mucus material preparation bin 2 are arranged in parallel in the horizontal direction, a water injection pipe 3 is arranged between the solidified material preparation bin 1 and the mucus material preparation bin 2, and the water injection pipe 3 is introduced into the solidified material stirring bin 1-3 and the mucus material storage bin 2-2;
the grouting hole sealing mechanism comprises a grouting pipe and a grouting pump 5, the grouting pipe comprises a first grouting pipe 4-1 connected with a solidified material discharge port 1-5 and a second grouting pipe 4-2 connected with a viscose material discharge port 2-4, and a third grouting pipe 4-3, the third grouting pipe 4-3 is connected with both the end of the first grouting pipe 4-1 and the end of the second grouting pipe 4-2, the grouting pump 5 is arranged on a third grouting pipe 4-3, a grout automatic switching valve 7 for automatically switching and conveying grout is arranged at the joint of the third grouting pipe 4-3 and the first grouting pipe 4-1 as well as the second grouting pipe 4-2, and the third grouting pipe 4-3 is also provided with a pressure gauge 9 for displaying a pressure value, and the tail end of the third grouting pipe 4-3 extends into the gas extraction borehole 6.
During specific implementation, the pulping device and the grouting hole sealing device can realize integration of pulping and grouting, and meanwhile, the setting of the solidifying material mechanism and the mucus material mechanism can meet the requirement that two different slurries of the solidifying material and the mucus material are injected into a single gas extraction drill hole 6.
In this embodiment, a first slurry leaking plate 1-31 and a first slurry blocking plate 1-32 are arranged at the bottom of the solidified material stirring bin 1-3, the first slurry leaking plate 1-31 is located above the first slurry blocking plate 1-32, a first weight sensor 1-33 is arranged on the first slurry leaking plate 1-31, a stirring rod 1-34 for stirring a solid material and water is rotatably connected to the center of the first slurry leaking plate 1-31, and a motor for driving the stirring rod 1-34 to rotate is arranged on the first slurry leaking plate 1-31; the bottom of the viscose material storage bin 2-2 is composed of a second slurry leaking plate 2-21 and a second slurry baffle 2-22, the second slurry leaking plate 2-21 is located above the second slurry baffle 2-22, and a second weight sensor 2-23 is arranged on the second slurry leaking plate 2-21.
In this embodiment, the stirring rod 1-34 includes a long rod 1-35 forming an angle of 45 degrees with the horizontal plane and a short rod 1-36 forming an angle of 45 degrees with the horizontal plane, and the end of the long rod 1-35 is fixedly connected with the end of the short rod 1-36 and then fixedly connected with the output shaft of the motor.
In this embodiment, as shown in fig. 2, an umbrella-shaped material leaking shell 1-21 and an umbrella-shaped material blocking shell 1-22 are arranged at the bottom of the solid material storage bin 1-2, the material leaking shell 1-21 is connected with the bottom of the material blocking shell 1-22 at intervals, the material blocking shell 1-22 is wrapped outside the material leaking shell 1-21, the material leaking shell 1-21 is divided into even first sectors 1-23 by taking the bottom as a circle center, one of the first sectors 1-23 is hollow, the material blocking shell 1-22 is divided into even second sectors 1-25 by taking the bottom as a circle center, and one of the second sectors 1-25 is hollow.
In this embodiment, as shown in fig. 3, a scraper 1-24 for scraping materials is rotatably connected to the top of the solid material storage bin 1-2, and the scraper 1-24 is composed of 3 hard PVC plates with tips connected to arc edges scattered and in a fan shape.
In the embodiment, the bottom of the solidified material discharging bin 1-4 is provided with a first arc-shaped material sliding plate 1-41; and a second arc-shaped sliding plate 2-31 is arranged at the bottom of the viscose material discharging bin 2-3.
In this embodiment, as shown in fig. 1 and 4, a mechanical automation controller 10 is arranged on the outer wall of the viscous liquid material preparation bin 2, a liquid flow meter 3-1 is arranged on the water injection pipe 3, a pressure sensor 8 for monitoring grouting pressure in a grouting process is arranged on the grouting pump 5, the output ends of the first weight sensor 1-33, the output ends of the second weight sensor 2-23, the output end of the pressure sensor 8 and the output end of the liquid flow meter 3-1 are all connected with the input end of the mechanical automation controller 10, and the automatic slurry switching valve 7 and the grouting pump 5 are all connected with the output end of the mechanical automation controller 10.
Adopt the utility model discloses when carrying out coal seam gas and taking out drilling slip casting hole sealing, including following step:
step one, preparing a solidified material;
according to the length of the hole sealing section, required solid materials are poured into a solid material storage bin 1-2 through a solid material feeding hole 1-1, the solid materials are uniformly swept into a solidified material stirring bin 1-3 by using a scraper 1-24, water is injected into the solidified material stirring bin 1-3 through a water injection pipe 3, and the solid materials and the water are stirred into uniform solidified materials by using a stirring rod 1-34;
the weight of the required solid material can be detected by arranging the first weight sensor 1-33, the amount of the injected water can be controlled by arranging the liquid flow meter 3-1, and a certain proportion of the solid material and the water can be conveniently realized.
Step two, preparing a viscose material;
according to the length of the hole sealing section, required viscose materials are poured into a viscose material storage bin 2-2 through a viscose material feeding hole 2-1;
wherein the weight of the required viscous material can be detected by providing the second weight sensor 2-23.
Step three, grouting and hole sealing;
the mechanical automatic controller 10 controls the grouting pump 5 to be in an open state, controls the automatic slurry switching valve 7 to enable the first grouting pipe 4-1 and the third grouting pipe 4-3 to be communicated, injects solidified materials into the gas extraction drill hole 6, and performs real-time monitoring on a grouting process by observing a pressure value on a pressure gauge 9 by grouting personnel to complete solidified material grouting;
the mechanical automatic controller 10 controls the grouting pump 5 to be still in an open state, controls the automatic grout switching valve 7 to enable the second grouting pipe 4-2 and the third grouting pipe 4-3 to be communicated, injects a viscose material into the gas extraction drill hole 6, indicates that the gas extraction drill hole 6 is full of grout when the pressure gauge 9 reaches a preset pressure value when the grout is fully injected, realizes the whole accurate grouting process, and controls the grouting pump 5 to be in a closed state through the mechanical automatic controller 10;
wherein, when the solidified material stirring bin 1-3 or the viscous liquid material storage bin 2-2 needs to be cleaned, water is injected into the solidified material stirring bin 1-3 or the viscous liquid material storage bin 2-2 through the water injection pipe 3 for cleaning.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and the equivalent structure change of doing above embodiment the utility model discloses technical scheme's within the scope of protection.
Claims (7)
1. The utility model provides a coal seam gas drainage is slip casting hole sealing equipment for drilling which characterized in that: comprises a pulping device and a grouting hole sealing device;
the pulping device comprises a solidified material mechanism and a viscose material mechanism, wherein the solidified material mechanism comprises a solidified material preparation bin (1), a solid material feeding hole (1-1) arranged at the top of the solidified material preparation bin (1), a solid material storage bin (1-2), a solidified material stirring bin (1-3) and a solidified material discharging bin (1-4) which are sequentially arranged in the solidified material preparation bin (1) from the top layer to the bottom layer, and a solidified material discharging hole (1-5) is formed in the center of the bottom of the solidified material discharging bin (1-4); the viscose material mechanism comprises a viscose material preparation bin (2), a viscose material feeding port (2-1) arranged at the top of the viscose material preparation bin (2), and a viscose material storage bin (2-2) and a viscose material discharging bin (2-3) which are sequentially arranged in the viscose material preparation bin (2) from the top layer to the bottom layer, wherein a viscose material discharging port (2-4) is formed in the center of the bottom of the viscose material discharging bin (2-3); the solidified material preparation bin (1) and the viscose material preparation bin (2) are arranged in parallel in the horizontal direction, a water injection pipe (3) is arranged between the solidified material preparation bin (1) and the viscose material preparation bin (2), and the water injection pipe (3) is introduced into the solidified material stirring bin (1-3) and the viscose material storage bin (2-2);
the grouting hole sealing mechanism comprises grouting pipes and a grouting pump (5), the grouting pipes comprise first grouting pipes (4-1) connected with solidified material discharge ports (1-5) and second grouting pipes (4-2) connected with viscose material discharge ports (2-4), and third grouting pipes (4-3), the third grouting pipes (4-3) are connected with the tail ends of the first grouting pipes (4-1) and the tail ends of the second grouting pipes (4-2), the grouting pump (5) is arranged on the third grouting pipes (4-3), automatic switching valves (7) for automatically switching and conveying grout are arranged at the connection positions of the third grouting pipes (4-3) and the first grouting pipes (4-1) and the second grouting pipes (4-2), and pressure gauges (9) for displaying grout are further arranged on the third grouting pipes (4-3), the tail end of the third grouting pipe (4-3) extends into the gas extraction drill hole (6).
2. The grouting hole sealing equipment for the coal seam gas extraction drill hole according to claim 1, characterized in that: a first slurry leaking plate (1-31) and a first slurry blocking plate (1-32) are arranged at the bottom of the solidified material stirring bin (1-3), the first slurry leaking plate (1-31) is positioned above the first slurry blocking plate (1-32), a first weight sensor (1-33) is arranged on the first slurry leaking plate (1-31), a stirring rod (1-34) for stirring solid materials and water is rotatably connected to the central position of the first slurry leaking plate (1-31), and a motor for driving the stirring rod (1-34) to rotate is arranged on the first slurry leaking plate (1-31); the bottom of the viscose material storage bin (2-2) is composed of a second slurry leaking plate (2-21) and a second slurry blocking plate (2-22), the second slurry leaking plate (2-21) is located above the second slurry blocking plate (2-22), and a second weight sensor (2-23) is arranged on the second slurry leaking plate (2-21).
3. The grouting hole sealing equipment for the coal seam gas extraction drill hole according to claim 2, characterized in that: the stirring rod (1-34) comprises a horizontal plane forming 45 degrees°The angle long rod (1-35) and the horizontal plane form 45 degrees°The end parts of the long rods (1-35) are fixedly connected with the end parts of the short rods (1-36) and then fixedly connected with an output shaft of the motor.
4. The grouting hole sealing equipment for the coal seam gas extraction drill hole according to claim 1, characterized in that: the bottom of the solid material storage bin (1-2) is provided with an umbrella-shaped material leaking shell (1-21) and an umbrella-shaped material blocking shell (1-22), the material leaking shell (1-21) is connected with the bottom of the material blocking shell (1-22) at intervals, the material blocking shell (1-22) is wrapped outside the material leaking shell (1-21), the material leaking shell (1-21) is divided into even first sectors (1-23) by taking the bottom as a circle center, one of every two first sectors (1-23) is hollow, the material blocking shell (1-22) is divided into even second sectors (1-25) by taking the bottom as a circle center, and one of every two second sectors (1-25) is hollow.
5. The grouting hole sealing equipment for the coal seam gas extraction drill hole according to claim 1, characterized in that: the top of the solid material storage bin (1-2) is rotatably connected with a scraper (1-24) for scraping materials, and the scraper (1-24) is composed of 3 PVC hard plates with the tips connected with the arc edges scattered and in a fan shape.
6. The grouting hole sealing equipment for the coal seam gas extraction drill hole according to claim 1, characterized in that: the bottom of the solidified material discharging bin (1-4) is provided with a first arc-shaped sliding plate (1-41); and a second arc-shaped sliding plate (2-31) is arranged at the bottom of the viscose material discharging bin (2-3).
7. The grouting hole sealing equipment for the coal seam gas extraction drill hole according to claim 2, characterized in that: be provided with mechanical automation controller (10) on the outer wall in mucus material preparation storehouse (2), be provided with fluidflowmeter (3-1) on water injection pipe (3), be provided with pressure sensor (8) that are used for monitoring slip casting in-process slip casting pressure on grouting pump (5), the output of first weight sensor (1-33), second weight sensor (2-23), the output of pressure sensor (8) and the output of fluidflowmeter (3-1) all are connected with the input of mechanical automation controller (10), thick liquid automatic changeover valve (7) and grouting pump (5) all are connected with the output of mechanical automation controller (10).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921746973.4U CN211422588U (en) | 2019-10-17 | 2019-10-17 | Grouting hole sealing equipment for coal seam gas extraction drilling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921746973.4U CN211422588U (en) | 2019-10-17 | 2019-10-17 | Grouting hole sealing equipment for coal seam gas extraction drilling |
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| CN211422588U true CN211422588U (en) | 2020-09-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113374442A (en) * | 2021-07-17 | 2021-09-10 | 山东科技大学 | Coal mine tunnel pressure relief drilling local hole plugging grouting device and method |
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2019
- 2019-10-17 CN CN201921746973.4U patent/CN211422588U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113374442A (en) * | 2021-07-17 | 2021-09-10 | 山东科技大学 | Coal mine tunnel pressure relief drilling local hole plugging grouting device and method |
| CN113374442B (en) * | 2021-07-17 | 2023-01-10 | 山东科技大学 | Coal mine tunnel pressure relief drilling local hole plugging grouting device and method |
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