CN112554938A - Colliery rescue device that comes to roof in pit - Google Patents
Colliery rescue device that comes to roof in pit Download PDFInfo
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- CN112554938A CN112554938A CN202011345540.5A CN202011345540A CN112554938A CN 112554938 A CN112554938 A CN 112554938A CN 202011345540 A CN202011345540 A CN 202011345540A CN 112554938 A CN112554938 A CN 112554938A
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- rescue
- rescue device
- rotating
- fixedly connected
- side wall
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F11/00—Rescue devices or other safety devices, e.g. safety chambers or escape ways
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/01—Methods or apparatus for enlarging or restoring the cross-section of tunnels, e.g. by restoring the floor to its original level
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Business, Economics & Management (AREA)
- Health & Medical Sciences (AREA)
- Emergency Management (AREA)
- Pulmonology (AREA)
- Environmental & Geological Engineering (AREA)
- Emergency Lowering Means (AREA)
Abstract
The invention discloses a coal mine underground roof collapse rescue device which comprises a rescue device shell, wherein a driving motor is fixedly connected to the inner wall of the rescue device shell, an output shaft of the driving motor is fixedly connected with a commutator, two worms are rotatably connected to the inner wall of the rescue device shell, a third rotating wheel is fixedly connected between the two worms, a first rotating wheel is arranged on a first output shaft of the commutator, the first rotating wheel and the third rotating wheel are in transmission connection through a crawler, the rescue device shell is rotatably connected with a plurality of rotating columns, and the plurality of rotating columns penetrate through the side wall of the rescue device shell. The invention can quickly get through a life channel at the place where the roof fall accident occurs, get in touch with trapped people at the first time, provide detailed information for subsequent rescue, and can transport out seriously injured people caused by the accident at the first time, thereby avoiding death caused by untimely rescue and protecting the life safety of coal mine workers.
Description
Technical Field
The invention relates to the technical field of roof collapse rescue, in particular to a coal mine underground roof collapse rescue device.
Background
Roof fall refers to an accident caused by channel collapse during mine excavation, and is one of the accidents frequently occurring in the production process of the mine excavation working face. If the goaf has no roof fall in a large area in coal mining work, the upper coal seam is planned to fall, also called roof fall, and people working in coal mines know that a plurality of natural disasters threaten the safety of miners in the production process of the mines. This is mainly water, fire, gas, dust and roof fall accidents. According to statistics of relevant statistical data, in coal mine production accidents in China, the occurrence proportion of roof collapse accidents is large, the number of times and the number of people are all ranked the first, and the damage is very serious.
In the prior art, when a roof fall accident occurs, due to the limitation of geographical environment, a large rescue device cannot enter for rescue at the first time, the underground environment is severe, a lot of seriously injured people cannot be rescued at the first time, and the seriously injured people are easy to die.
Therefore, a coal mine roof collapse rescue device is provided to solve the problems.
Disclosure of Invention
The invention aims to solve the problems that a large rescue device cannot enter for rescue at the first time due to the limitation of geographical environment, and a lot of seriously injured people cannot be rescued at the first time due to severe underground environment and are easy to die due to serious injury when a roof fall accident occurs in the prior art, and provides a coal mine underground roof fall rescue device.
In order to achieve the purpose, the invention adopts the following technical scheme:
the coal mine roof fall rescue device comprises a rescue device shell, wherein a driving motor is fixedly connected to the inner wall of the rescue device shell, an output shaft of the driving motor is fixedly connected with a commutator, the inner wall of the rescue device shell is rotatably connected with two worms, a third rotating wheel is fixedly connected between the two worms, a first output shaft of the commutator is provided with a first rotating wheel, the first rotating wheel and the third rotating wheel are connected through crawler transmission, the rescue device shell is rotatably connected with a plurality of rotating columns, the plurality of rotating columns penetrate through the side wall of the rescue device shell, the joints of the plurality of rotating columns and the side wall of the rescue device shell are rotatably connected in a sealing manner, the plurality of rotating columns are fixedly connected with worm wheels matched with the worms, one ends of the plurality of rotating columns, far away from the worm wheels, are fixedly connected with drill bits, and a second output shaft of the commutator is provided with a second rotating wheel, the lateral wall of rescue device shell rotates and is connected with two dwangs, two the dwang all runs through the lateral wall of rescue device shell, two the sealed rotation of junction of dwang and rescue device shell lateral wall is connected, two fixedly connected with fourth rotation wheel between the dwang, the second rotates the wheel and is connected through track transmission with the fourth rotation wheel, two the one end fixedly connected with drive wheel of rescue device shell is kept away from to the dwang, the lateral wall of rescue device shell is equipped with rescue conveyor.
Preferably, the rescue conveying device comprises a plurality of rescue assemblies, the side walls of the plurality of rescue assemblies are fixedly connected through telescopic rods, and elastic cloth is fixedly connected among the plurality of rescue assemblies.
Preferably, a plurality of rescue subassembly is including dysmorphism piece and bracing piece, dysmorphism piece lower extreme lateral wall is through a plurality of bumper shock absorbers and rescue subassembly's lateral wall fixed connection, the upper end lateral wall fixed connection of dysmorphism piece has the cushion.
Preferably, a plurality of the lateral wall fixedly connected with standing groove of rescue subassembly, it is a plurality of the standing groove inner wall all is equipped with the blotter.
Preferably, a plurality of driven wheels are rotatably connected to the side walls of the rescue assemblies through supporting rods, and the number of the rescue assemblies with the driven wheels arranged on the side walls in the rescue assemblies is not less than two.
Preferably, it is a plurality of in the rescue subassembly with rescue device shell distance one lateral wall far away be equipped with two and rotate the groove, two all rotate between the both sides inner wall in rotation groove and be connected with the pivot, two all the cover is equipped with the open-close board in the pivot, two the open-close board just in time can cover the lateral wall of rescue subassembly completely, two be equipped with rotary switch between the open-close board.
Preferably, the side walls of the two baffles are provided with observation windows, the observation windows are provided with toughened glass matched with the observation windows, the two baffles are provided with ventilation holes, and the two ventilation holes are provided with dust screens.
Preferably, the lower end of the special-shaped baffle is fixedly connected with the rescue device shell through a plurality of damping air bags, and the plurality of rescue air bags are uniformly distributed between the special-shaped baffle and the rescue device shell.
Preferably, the side wall of the lower end of the shell of the rescue device is fixedly connected with a special-shaped push plate, the special-shaped push plate is positioned at one end close to the drill bit, and the width of the special-shaped baffle is consistent with the diameter of the shell of the rescue device.
Compared with the prior art, the invention has the beneficial effects that:
1. through the matching of the structures such as the driving motor, the commutator, the drill bit, the rescue assembly and the like, a life passage can be quickly opened at the roof fall accident occurrence place, the first time is in contact with trapped people, detailed information is provided for subsequent rescue, and serious injury people caused by accidents can be conveyed out at the first time, so that death caused by untimely rescue is avoided, and the life safety of coal mine workers is protected;
2. the arrangement of the elastic cloth, the telescopic rod, the plurality of rescue assemblies and the plywood can assemble a rescue stretcher with a protection function, isolate injured workers from the external severe environment, stably transport out the workers with a heavier injury, avoid the workers with the heavier injury from deteriorating due to environmental factors, and protect the safety of the workers;
3. a certain amount of rescue materials can be put into the placing groove through the placing groove, and the rescue materials are conveyed into the coal mine when the rescue device enters the coal mine at the first time, so that the life safety of trapped people is guaranteed.
Drawings
FIG. 1 is a schematic side structure view of a rescue device shell of a coal mine roof collapse rescue device provided by the invention;
FIG. 2 is a schematic cross-sectional structure view of a rescue device shell of a coal mine roof collapse rescue device provided by the invention;
FIG. 3 is a schematic cross-sectional structure view of a rescue assembly of a coal mine roof collapse rescue device provided by the invention;
fig. 4 is a schematic side structure view of a rescue assembly of the coal mine roof fall rescue device provided by the invention.
In the figure: the rescue device comprises a drill bit 1, a rescue device shell 2, a rotating column 3, a special-shaped push plate 4, a crawler 5, a first rotating wheel 6, a fourth rotating wheel 7, a second rotating wheel 8, a telescopic rod 9, elastic cloth 10, a commutator 11, a driving motor 12, a worm wheel 13, a third rotating wheel 14, a special-shaped baffle 15, a driving wheel 16, a rotating rod 17, a worm 18, a placing groove 19, an air bag 20, a supporting rod 21, a cushion 22, a shock absorber 23, a special-shaped block 24, a rotating shaft 25, a ventilating hole 26, an observation window 27, a driven wheel 28, a rotating switch 29, a plywood 30 and a rotating groove 31.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-4, a coal mine roof fall rescue device comprises a rescue device shell 2, the rescue device shell 2 is cylindrical, a stable structure is formed in the vertical direction, the stability of the whole rescue device is ensured, a driving motor 12 is fixedly connected to the inner wall of the rescue device shell 2, an output shaft of the driving motor 12 is fixedly connected with a commutator 11, the side wall of the commutator 11 is fixedly connected with the inner wall of the rescue device shell 2 through a plurality of fixing rods, the number of the fixing rods is not less than two, the stability of the commutator 11 is increased due to the arrangement of the fixing rods, the commutator 11 is prevented from shaking during the operation process, the smooth and normal operation of the whole device is ensured, two worms 18 are rotatably connected to the inner wall of the rescue device shell 2, a third rotating wheel 14 is fixedly connected between the two worms 18, a first rotating wheel 6 is arranged on a first output shaft of the commutator 11, the first rotating wheel 6 is in transmission connection with the third rotating wheel 14 through a crawler 5, the shell 2 of the rescue device is in rotation connection with a plurality of rotating columns 3, the plurality of rotating columns 3 all penetrate through the side wall of the shell 2 of the rescue device, the joints of the plurality of rotating columns 3 and the side wall of the shell 2 of the rescue device are in sealed rotation connection, the plurality of rotating columns 3 are all fixedly connected with a worm wheel 13 matched with a worm 18, one ends of the plurality of rotating columns 3 far away from the worm wheel 13 are all fixedly connected with a drill bit 1, a second output shaft of the commutator 11 is provided with a second rotating wheel 8, the side wall of the shell 2 of the rescue device is in rotation connection with two rotating rods 17, the two rotating rods 17 all penetrate through the side wall of the shell 2 of the rescue device, the joints of the two rotating rods 17 and the side wall of the shell 2 of the rescue device are in sealed rotation connection, a fourth rotating wheel 7 is fixedly connected between, one ends of the two rotating rods 17 far away from the shell 2 of the rescue device are fixedly connected with driving wheels 16;
the side wall of the shell 2 of the rescue device is provided with a rescue conveying device which comprises a plurality of rescue components, the side walls of the plurality of rescue components are fixedly connected through a telescopic rod 9, one side wall of the plurality of rescue components, which is farthest away from the shell 2 of the rescue device, is provided with two rotating grooves 31, rotating shafts 25 are rotatably connected between the inner walls of the two sides of the two rotating grooves 31, open-close plates 30 are sleeved on the two rotating shafts 25, the two open-close plates 30 just cover the side walls of the rescue components completely, a rotating switch 29 is arranged between the two open-close plates 30, elastic cloth 10 is fixedly connected between the plurality of rescue components, the telescopic rod 9, the plurality of rescue components and the open-close plates 30, a rescue stretcher with a protection function can be assembled, injured workers are isolated from the external severe environment, and the workers with heavy injury can be stably conveyed out, the damage deterioration of workers with heavier damage due to environmental factors is avoided, the safety of the workers is protected, the plurality of rescue assemblies comprise the special-shaped block 24 and the supporting rod 21, the supporting rod 21 is arranged, the stability of the rescue assemblies is improved, the side wall of the lower end of the special-shaped block 24 is fixedly connected with the side wall of the rescue assembly through the plurality of shock absorbers 23, the side wall of the upper end of the special-shaped block 24 is fixedly connected with the cushion 22, and the shock absorbers 23 and the cushion 22 are arranged, so that the influence of external shock on the injured workers can be reduced to the maximum extent, the damage deterioration of the injured workers due to the shock is avoided, and the injured workers;
the side walls of the plurality of rescue assemblies are fixedly connected with the placing grooves 19, the inner walls of the plurality of placing grooves 19 are respectively provided with a cushion pad, a certain amount of rescue materials can be placed in the placing grooves 19, when the rescue device enters a coal mine at the first time, the rescue materials are conveyed into the coal mine, the life safety of trapped people is guaranteed, the cushion pads are arranged, the safety of fragile materials in the placing grooves 19 can be protected, the damage of the rescue materials in the placing grooves 19 caused by vibration and shaking is avoided, the side walls of the plurality of rescue assemblies are rotatably connected with a plurality of driven wheels 28 through supporting rods, the number of the rescue assemblies of which the side walls are provided with the driven wheels 28 is not less than two, the stability of the whole rescue device in the advancing process is improved, the side walls of the two baffles are provided with observation windows 27, toughened glass matched with the observation windows 27 is arranged on the observation windows 27, and the, all be equipped with the dust screen on two scavenge ports 26, guarantee that inside air is smooth, rescue device housing 2's upper end lateral wall dysmorphism baffle 15, the lower extreme of dysmorphism baffle 15 is through a plurality of shock attenuation gasbags 20 and rescue device housing 2 fixed connection, a plurality of rescue gasbags 20 even distribution is between dysmorphism baffle 15 and rescue device housing 2, avoid the falling rocks and the rescue device housing 2 direct collision of passageway top, protect whole rescue device, increase whole rescue device's life, the lower extreme lateral wall fixedly connected with dysmorphism push pedal 4 of rescue device housing 2, dysmorphism push pedal 4 is located the one end that is close to drill bit 1, the width of dysmorphism baffle 15 is unanimous with the diameter of rescue device housing 2, can push broken earth and stone to rescue device both sides, guarantee that rescue device can be smooth gos forward.
When the roof fall accident occurs, a certain amount of rescue materials are placed in a placing groove 19, a driving motor 12 is driven to operate, the driving motor 12 drives a commutator 11 to operate, a first output shaft of the commutator 11 drives a first rotating wheel 6 to rotate, a first rotating wheel 6 and a crawler 5 drive a third rotating wheel 14 to rotate, the third rotating wheel 14 drives a worm 18 to rotate, the worm 18 drives a worm wheel 13 to rotate, the worm wheel 13 drives a drill bit 1 to rotate through a rotating column 3, soil and stones at the roof fall occurrence position are crushed and cleaned, a second output shaft of the commutator 11 drives a second rotating wheel 8 to rotate, the second rotating wheel 8 drives a fourth rotating wheel 7 to rotate through the crawler 5, the fourth rotating wheel 7 drives a driving wheel 16 to rotate through a rotating rod 17, the driving wheel 16 drives a rescue device to move forwards, and the crushed soil and stones are pushed to two sides of the rescue device under the action of a special-shaped push plate 4, get through the section of collapsing after, join with stranded personnel, then colliery workman will rotate switch 29 and open, take out the rescue goods and materials in the standing groove 19, then pull open a plurality of rescue subassemblies, through the effect of telescopic link 9 and stretch cloth 10, form a rescue stretcher, put the workman that the disability is heavier back on the rescue stretcher, close plywood 30, rescue device returns on the same way, can be quick get through a life passageway in roof fall accident place, the very first time gets into contact with stranded personnel, provide detailed data for follow-up rescue, and can transport out because of the very first time of the heavy injury personnel that the accident leads to, avoid leading to death because of the untimely rescue, colliery workman's life safety has been protected.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The coal mine roof fall rescue device comprises a rescue device shell (2) and is characterized in that a driving motor (12) is fixedly connected to the inner wall of the rescue device shell (2), an output shaft of the driving motor (12) is fixedly connected with a commutator (11), two worms (18) are rotatably connected to the inner wall of the rescue device shell (2), a third rotating wheel (14) is fixedly connected between the worms (18), a first output shaft of the commutator (11) is provided with a first rotating wheel (6), the first rotating wheel (6) is in transmission connection with the third rotating wheel (14) through a crawler belt (5), the rescue device shell (2) is rotatably connected with a plurality of rotating columns (3), the plurality of rotating columns (3) penetrate through the side wall of the rescue device shell (2), and the connecting positions of the rotating columns (3) and the side wall of the rescue device shell (2) are in sealing and rotating connection, a plurality of rotating columns (3) are fixedly connected with worm wheels (13) matched with worms (18), one ends, far away from the worm wheels (13), of the rotating columns (3) are fixedly connected with drill bits (1), a second output shaft of the commutator (11) is provided with second rotating wheels (8), the side wall of the shell (2) of the rescue device is rotatably connected with two rotating rods (17), the two rotating rods (17) penetrate through the side wall of the shell (2) of the rescue device, the connecting part of the two rotating rods (17) and the side wall of the shell (2) of the rescue device is rotatably connected in a sealing way, a fourth rotating wheel (7) is fixedly connected between the two rotating rods (17), the second rotating wheel (8) and the fourth rotating wheel (7) are connected through a crawler belt (5) in a transmission way, the two ends, far away from the shell (2) of the rescue device, of the rotating rods (17) are fixedly connected with driving wheels (16, the side wall of the rescue device shell (2) is provided with a rescue conveying device.
2. The coal mine roof fall rescue device according to claim 1, characterized in that the rescue conveying device comprises a plurality of rescue assemblies, the side walls of the rescue assemblies are fixedly connected through telescopic rods (9), and elastic cloth (10) is fixedly connected among the rescue assemblies.
3. The coal mine underground roof fall rescue device according to claim 2, characterized in that the rescue assemblies comprise a special-shaped block (24) and a support rod (21), the side wall of the lower end of the special-shaped block (24) is fixedly connected with the side wall of the rescue assembly through a plurality of shock absorbers (23), and the side wall of the upper end of the special-shaped block (24) is fixedly connected with a cushion (22).
4. The coal mine underground roof fall rescue device according to claim 2, characterized in that a plurality of accommodating grooves (19) are fixedly connected to the side walls of the rescue assembly, and cushion pads are arranged on the inner walls of the accommodating grooves (19).
5. The coal mine underground roof fall rescue device according to claim 2, characterized in that a plurality of driven wheels (28) are rotatably connected to the side walls of the rescue assemblies through supporting rods, and the number of the rescue assemblies with the driven wheels (28) arranged on the side walls is not less than two.
6. The coal mine underground roof fall rescue device according to claim 2, characterized in that one side wall of the rescue assemblies, which is farthest away from the rescue device shell (2), is provided with two rotating grooves (31), the inner walls of two sides of the two rotating grooves (31) are rotatably connected with a rotating shaft (25), the two rotating shafts (25) are respectively sleeved with an opening plate (30), the two opening plates (30) just cover the side wall of the rescue assembly completely, and a rotating switch (29) is arranged between the two opening plates (30).
7. The coal mine underground roof fall rescue device according to claim 2, characterized in that an observation window (27) is arranged on the side wall of each of the two baffles, toughened glass matched with the observation window (27) is arranged on the observation window, ventilating holes (26) are arranged on each of the two baffles, and a dust screen is arranged on each of the two ventilating holes (26).
8. The coal mine underground roof fall rescue device according to claim 2, characterized in that the upper end of the rescue device shell (2) is provided with a special-shaped baffle (15), the lower end of the special-shaped baffle (15) is fixedly connected with the rescue device shell (2) through a plurality of shock absorption air bags (20), and the plurality of rescue air bags (20) are uniformly distributed between the special-shaped baffle (15) and the rescue device shell (2).
9. The coal mine underground roof fall rescue device according to claim 1, characterized in that a special-shaped push plate (4) is fixedly connected to the side wall of the lower end of the rescue device shell (2), the special-shaped push plate (4) is located at one end close to the drill bit (1), and the width of the special-shaped baffle plate (15) is consistent with the diameter of the rescue device shell (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011345540.5A CN112554938A (en) | 2020-11-25 | 2020-11-25 | Colliery rescue device that comes to roof in pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011345540.5A CN112554938A (en) | 2020-11-25 | 2020-11-25 | Colliery rescue device that comes to roof in pit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112554938A true CN112554938A (en) | 2021-03-26 |
Family
ID=75045659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011345540.5A Withdrawn CN112554938A (en) | 2020-11-25 | 2020-11-25 | Colliery rescue device that comes to roof in pit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112554938A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102140928A (en) * | 2010-02-03 | 2011-08-03 | 沈忠毅 | Tunnel-type underground escape system |
| CN204002908U (en) * | 2014-07-18 | 2014-12-10 | 蒋甜 | A kind of multifunctional mobile tunnel life saving system |
| CN106246219A (en) * | 2016-09-23 | 2016-12-21 | 羊丁 | A kind of mine safety rescue robot |
| CN108324440A (en) * | 2018-01-19 | 2018-07-27 | 卡斯纳（苏州）医疗设备有限公司 | A kind of folding Ambulance stretcher |
| CN207829807U (en) * | 2018-01-30 | 2018-09-07 | 浙江久山重工股份有限公司 | The multi-rod drill bit structure of drill carriage |
| CN109026138A (en) * | 2018-09-27 | 2018-12-18 | 大连卓亿科技有限公司 | A kind of pit robot and emergency management and rescue method |
| CN109466402A (en) * | 2018-10-13 | 2019-03-15 | 广东嗨学云教育科技有限公司 | A kind of earthquake rescue robot with safeguard function |
| CN211851908U (en) * | 2020-01-19 | 2020-11-03 | 山东为华智能设备制造有限公司 | Rotary drilling type small-aperture escape cylinder for rescue after roof collapse of roadway |
-
2020
- 2020-11-25 CN CN202011345540.5A patent/CN112554938A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102140928A (en) * | 2010-02-03 | 2011-08-03 | 沈忠毅 | Tunnel-type underground escape system |
| CN204002908U (en) * | 2014-07-18 | 2014-12-10 | 蒋甜 | A kind of multifunctional mobile tunnel life saving system |
| CN106246219A (en) * | 2016-09-23 | 2016-12-21 | 羊丁 | A kind of mine safety rescue robot |
| CN108324440A (en) * | 2018-01-19 | 2018-07-27 | 卡斯纳（苏州）医疗设备有限公司 | A kind of folding Ambulance stretcher |
| CN207829807U (en) * | 2018-01-30 | 2018-09-07 | 浙江久山重工股份有限公司 | The multi-rod drill bit structure of drill carriage |
| CN109026138A (en) * | 2018-09-27 | 2018-12-18 | 大连卓亿科技有限公司 | A kind of pit robot and emergency management and rescue method |
| CN109466402A (en) * | 2018-10-13 | 2019-03-15 | 广东嗨学云教育科技有限公司 | A kind of earthquake rescue robot with safeguard function |
| CN211851908U (en) * | 2020-01-19 | 2020-11-03 | 山东为华智能设备制造有限公司 | Rotary drilling type small-aperture escape cylinder for rescue after roof collapse of roadway |
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Application publication date: 20210326 |