CN112611284B - A protector that is used for colliery blasting to be convenient for receive and close - Google Patents
A protector that is used for colliery blasting to be convenient for receive and close Download PDFInfo
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- CN112611284B CN112611284B CN202011457542.3A CN202011457542A CN112611284B CN 112611284 B CN112611284 B CN 112611284B CN 202011457542 A CN202011457542 A CN 202011457542A CN 112611284 B CN112611284 B CN 112611284B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D5/00—Safety arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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Abstract
The invention discloses a protection device convenient to fold and collapse for coal mine blasting, which relates to the technical field of coal mine blasting protection devices. According to the invention, through adjusting the expansion of the protective net and the telescopic protection plate, more flying stones can be blocked, the protective range is increased, the safety is higher, the folding work of the protective net and the telescopic protection plate can be automatically realized, dust and stones on the protective net can be shaken off in the folding process, manual cleaning is not needed, the working efficiency is improved, and in addition, flying stones in the blasting process can be prevented from entering the shell, so that the damage of internal elements of the device is avoided, and the practicability of the device is further improved.
Description
Technical Field
The invention relates to the technical field of coal mine blasting protection devices, in particular to a protection device which is used for coal mine blasting and is convenient to fold.
Background
Coal is a solid fuel, although the environmental protection concept of mankind is gradually enhanced in recent years, the use of coal mine is reduced to a certain extent, but the coal mine is still a more common energy source at present, in the exploitation process of coal mine, the coal mine is often required to be blasted, and the blasting of coal mine is generally accompanied by the splashing of broken stone, and the broken stone is splashed at an extremely high speed in blasting despite the small size, if the broken stone is directly hit to a human body, the human body is definitely damaged greatly, so that a protection device is generally required to be used in the blasting of coal mine.
The existing protecting device is simple in structure, the flying stones are blocked by only depending on a relatively firm protection plate matched with the protecting net, the existing protecting device is high and certain in spite of the basic protecting effect, some flying stones possibly fly to a high place under the action of huge impact force and are smashed towards a human body, the protecting range is small, the existing protecting device is inconvenient to fold when being used, the whole size of the protecting device cannot be too small to ensure the protecting effect, the protecting device is inconvenient to move, in addition, the protecting device partially provided with the protecting net is used for finishing the protecting net by the existing manual work after blasting, dust and stones on the protecting net need to be shaken off so that the protecting net can be used subsequently, manual cleaning is time-consuming and labor-consuming, the practicability of the device is reduced, and the protecting device which is convenient to fold and is used for blasting in a coal mine is required to be designed to solve the problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a protective device which is used for coal mine blasting and is convenient to fold.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a protector convenient to receive and close for colliery blasting, including casing and the flexible guard plate of setting on the casing, the casing upper end is equipped with the protection machanism that is used for blasting protection, protection machanism includes the fixed guard plate of fixed connection in the casing upper end, flexible guard plate upper end fixedly connected with roof, roof lower extreme fixedly connected with a plurality of solid fixed ring, a plurality of gu be equipped with the protection network on the fixed ring jointly, be equipped with the actuating mechanism that is used for driving flexible guard plate to go up and down in the casing, be equipped with the receiving mechanism who is used for receiving the protection network in the casing, be equipped with the vibration mechanism who is used for trembling the protection network stone on the casing, be equipped with the fixed establishment who is used for fixed protection network on the casing.
Preferably, the actuating mechanism rotates and connects two threaded rods in the casing, two threaded rods upper end runs through the casing upper end, flexible guard plate lateral wall symmetry fixedly connected with two first baffles, two first baffles are located respectively fixed guard plate both sides, two the equal fixedly connected with limiting plate of the relative lateral wall of first baffle, two threaded rods upper end all runs through the homonymy limiting plate upper end, two the relative lateral wall of limiting plate respectively with fixed guard plate both sides wall sliding connection, two the threaded rods are located the lateral wall of casing and all fixedly cup jointed first conical gear, the equal fixedly connected with biax motor in the casing, two equal fixedly connected with axis of rotation of output of biax motor, two the equal fixedly connected with of one end that the biax motor was kept away from to the axis of rotation can with the homonymy second conical gear of first conical gear meshing.
Preferably, the storage mechanism comprises a first vertical plate fixedly connected to the inner bottom of the shell, a first rotating rod is rotationally connected to the side wall of the first vertical plate, a first gear is fixedly connected to one end of the first rotating rod, a mounting opening is formed in the upper end of the shell, a mounting plate is fixedly connected to the upper end of the shell through bolts, the mounting plate is opposite to the mounting opening, two first fixing plates are symmetrically and fixedly connected to the lower end of the mounting plate, two side walls of the first fixing plates are jointly rotationally connected with a second rotating rod, the second rotating rod is in transmission connection with the first rotating rod through a first belt, one end of the second rotating rod penetrates through the side wall of the first fixing plate and is fixedly connected with a second gear which can be meshed with the first gear, the lower end of the protective net penetrates through the mounting opening and is fixedly connected with the side wall of the second rotating rod through bolts, and the protective net is wound on the side wall of the second rotating rod.
Preferably, the vibration mechanism comprises two second vertical plates fixedly connected to the upper end of the fixed protection plate, the two opposite side walls of the second vertical plates are fixedly connected with a third rotating rod in a rotating mode, the side walls of the third rotating rod are fixedly sleeved with cams at equal intervals, the upper end of the fixed protection plate is fixedly connected with two third vertical plates, the two opposite side walls of the third vertical plates are fixedly connected with a fourth rotating rod in a rotating mode, the third rotating rod is in transmission connection with the fourth rotating rod through a second belt, the side walls of the fourth rotating rod are fixedly sleeved with a third gear, and the telescopic protection plate is fixedly connected with a toothed plate matched with the third gear.
Preferably, the fixing mechanism comprises a second fixing plate fixedly connected to the upper end of the shell, a sliding groove is formed in the upper end of the shell, a sliding block is connected in the sliding groove in a sliding mode, the upper end of the sliding block is fixedly connected with a moving plate, and the upper end of the moving plate is fixedly connected with a blanking plate.
Preferably, two opposite side walls of the first baffle are fixedly connected with second baffles, and two side walls of the fixed protection plate are fixedly connected with third baffles.
Preferably, the second fixed plate side wall is elastically connected with the movable plate side wall through a plurality of springs, the blanking plate is obliquely arranged, and the mounting plate is positioned below the blanking plate.
The invention has the following beneficial effects:
1. the device is provided with the protection mechanism, the two output shafts of the double-shaft motor drive the two rotating shafts to rotate, the two rotating shafts drive the two threaded rods through the meshing of the first conical gear and the second conical gear, the telescopic protection plate moves upwards under the action of the two limiting plates, the protection net also extends along with the rising of the telescopic protection plate, flying stones with more heights can be prevented, the protection range is increased, and the safety is higher;
2. the device is provided with the storage mechanism, the output shaft of the double-shaft motor reversely rotates to drive the two rotating shafts to reversely rotate, the two rotating shafts drive the telescopic protection plate to downwards move, and the second rotating rod reversely rotates to enable the protection net to be wound on the second rotating rod, so that manual winding is not needed, and the working efficiency is improved;
3. the device is provided with the vibration mechanism, and the toothed plate is meshed with the third gear all the time in the downward movement process of the telescopic protection plate, so that the third gear is driven to rotate, the third gear drives the fourth rotating rod to rotate, the fourth rotating rod drives the third rotating rod to rotate through the transmission of the second belt, the third rotating rod drives the cam to rotate, and in the cam rotation process, the third rotating rod contacts with the protection net, so that dust and stones on the protection net can be shaken off, and the working efficiency is further improved;
4. this device has set up fixed establishment, and the stone that flies up in the blasting rolls along the flitch inclined plane down, avoids the stone to get into in the casing from the installing port for the device internal element damages and can't continue work, and then has improved the practicality of device.
Drawings
Fig. 1 is a schematic structural view of a protection device for coal mine blasting, which is convenient to fold and close;
FIG. 2 is an enlarged view of the structure at A of FIG. 1;
FIG. 3 is a side view of a folding-facilitating guard for coal mine blasting according to the present invention;
FIG. 4 is an enlarged view of the structure at B of FIG. 3;
FIG. 5 is an enlarged view of the structure at C of FIG. 3;
fig. 6 is a top view of a telescopic protection plate and a fixed protection plate of a protection device which is convenient to fold and is used for coal mine blasting.
In the figure: 1 a shell, 2 a first baffle, 3 a fixed protection plate, 4 a threaded rod, 5 a limit plate, 6 a top plate, 7 a fixed ring, 8 a telescopic protection plate, 9 a first fixed plate, 10 a protection net, 11 a first conical gear, 12 a double-shaft motor, 13 a rotating shaft, 14 a first vertical plate, 15 a second conical gear, 16 a first rotating rod, 17 a first gear, 18 a second gear, 19 a second rotating rod, 20 a mounting plate, 21 a second vertical plate, 22 a third rotating rod, 23 a cam, 24 a third gear, 25 a third vertical plate, 26 a fourth rotating rod, 27 a toothed plate, 28 a blanking plate, 29 a moving plate, 30 a second fixed plate, 31 a sliding block, 32 a sliding groove, 33 a second baffle and 34 a third baffle.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1-6, a protection device convenient to receive and close for colliery blasting, including casing 1 and the flexible guard plate 8 of setting on casing 1, casing 1 upper end is equipped with the protection machanism that is used for blasting protection, protection machanism includes fixed guard plate 3 of fixed connection in casing 1 upper end, flexible guard plate 8 upper end fixedly connected with roof 6, fixed guard plate 3 and flexible guard plate 8 are made by having certain strong steel sheet, for realizing fixed guard plate 3 and flexible guard plate 8 long-term the utilization in the realization operation, can set up the rubber pad at fixed guard plate 3 and flexible guard plate 8 lateral wall, roof 6 lower extreme fixedly connected with a plurality of solid fixed ring 7, be equipped with protection network 10 jointly on a plurality of solid fixed ring 7, protection network 10 upper end can be fixed on solid fixed ring 7 through the rope for protection network 10 can conveniently change, the device can reuse.
Be equipped with the actuating mechanism that is used for driving flexible guard plate 8 to go up and down in the casing 1, actuating mechanism rotates two threaded rods 4 of connecting in the casing 1 bottom, two threaded rods 4 upper ends run through casing 1 upper end, flexible guard plate 8 lateral wall symmetry fixedly connected with two first baffles 2, two first baffles 2 are located fixed guard plate 3 both sides respectively, the equal fixedly connected with limiting plate 5 of the lateral wall that two first baffles 2 are relative, limiting plate 5 upper ends of two threaded rods 4 all run through the homonymy, the lateral wall that two limiting plates 5 are relative respectively with fixed guard plate 3 both sides wall sliding connection, limiting plate 5 can't rotate when making two threaded rods 4 rotate, make flexible guard plate 8 only can follow threaded rod 4 direction and reciprocate.
In the invention, the side walls of the two threaded rods 4 positioned in the shell 1 are fixedly sleeved with a first conical gear 11, the inner bottom of the shell 1 is fixedly connected with a double-shaft motor 12, two output shafts of the double-shaft motor 12 are fixedly connected with rotating shafts 13, and one ends of the two rotating shafts 13 far away from the double-shaft motor 12 are fixedly connected with a second conical gear 15 which can be meshed with the first conical gear 11 on the same side.
The housing 1 is internally provided with a housing mechanism for housing the protection net 10, the housing mechanism comprises a first vertical plate 14 fixedly connected to the inner bottom of the housing 1, the side wall of the first vertical plate 14 is rotationally connected with a first rotating rod 16, one end of the first rotating rod 16 is fixedly connected with a first gear 17, the upper end of the housing 1 is provided with a mounting opening, the upper end of the housing 1 is fixedly connected with a mounting plate 20 through bolts, the mounting plate 20 is opposite to the mounting opening, the lower end of the mounting plate 20 is symmetrically and fixedly connected with two first fixing plates 9, the side walls of the two first fixing plates 9 are jointly rotationally connected with a second rotating rod 19, the second rotating rod 19 is in transmission connection with the first rotating rod 16 through a first belt, one end of the second rotating rod 19 penetrates through the side wall of the first fixing plate 9 on the same side and is fixedly connected with a second gear 18 which can be meshed with the first gear 17, the lower end of the protection net 10 penetrates through the mounting opening and is fixedly connected with the side wall of the second rotating rod 19 through bolts, the protection net 10 is wound on the side wall of the second rotating rod 19 through bolts, the work efficiency is improved, the protection net 10 can be removed from the side wall of the second rotating rod 19 through screwing out of the side wall, and the protection net 10 can be replaced by manually.
The casing 1 is provided with a vibration mechanism for shaking off stones on the protection net 10, the vibration mechanism comprises two second vertical plates 21 fixedly connected to the upper end of the fixed protection plate 3, the opposite side walls of the two second vertical plates 21 are jointly connected with a third rotating rod 22 in a rotating mode, the side walls of the third rotating rod 22 are fixedly sleeved with cams 23 at equal intervals, the upper end of the fixed protection plate 3 is fixedly connected with two third vertical plates 25, the opposite side walls of the two third vertical plates 25 are jointly connected with a fourth rotating rod 26 in a rotating mode, the third rotating rod 22 is in transmission connection with the fourth rotating rod 26 through a second belt, the side walls of the fourth rotating rod 26 are fixedly sleeved with a third gear 24, the telescopic protection plate 8 is fixedly connected with a toothed plate 27 which can be matched with the third gear 24, the diameter of the cams 23 is smaller than the distance between the third rotating rod 22 and the fourth rotating rod 26, the cams 23 are prevented from being bumped against the fourth rotating rod 26 when the cams 23 rotate, the device cannot normally run, when the long ends of the cams 23 rotate to the surface of the protection net 10, the protection net 10 can be lifted, the cams 23 continue to rotate to the protection net 10 to restore the vertical state, and dust on the protection net 10 can shake down, and dust on the protection net 10 can be formed.
The casing 1 is provided with a fixing mechanism for fixing the protective net 10, the fixing mechanism comprises a second fixing plate 30 fixedly connected to the upper end of the casing 1, a sliding groove 32 is formed in the upper end of the casing 1, a sliding block 31 is connected to the sliding groove 32 in a sliding mode, a moving plate 29 is fixedly connected to the upper end of the sliding block 31, a blanking plate 28 is fixedly connected to the upper end of the moving plate 29, the side wall of the second fixing plate 30 is elastically connected with the side wall of the moving plate 29 through a plurality of springs, the blanking plate 28 is obliquely arranged, the mounting plate 20 is located below the blanking plate 28, stones are prevented from entering the casing 1 from a mounting hole in the blasting process, and therefore internal elements of the device are damaged and cannot work continuously.
According to the invention, the second baffle plates 33 are fixedly connected to the opposite side walls of the two first baffle plates 2, the third baffle plates 34 are fixedly connected to the two side walls of the fixed protection plate 3, and stone can be prevented from entering between the first baffle plates 2 and the fixed protection plate 3, so that the threaded rod 4 cannot continue to rotate.
In use, the telescopic guard plate 8 is received behind the fixed guard plate 3.
When the protection device is used, firstly, the protection device is placed at a proper position, the protection plate 3 is fixed, when the protection area of the protection device cannot meet the current protection requirement, the blanking plate 28 is pulled outwards, the pressure on one side of the protection net 10 is relieved by the side wall of the blanking plate 28, the double-shaft motor 12 is started, two output shafts of the double-shaft motor 12 drive the two rotating shafts 13 to rotate, the two rotating shafts 13 drive the two threaded rods 4 through the meshing of the first bevel gear 11 and the second bevel gear 15, the telescopic protection plate 8 moves upwards under the action of the two limiting plates 5, the rotating shafts 13 drive the first rotating rod 16 to rotate through the first belt transmission in the rotating process, the first rotating rod 16 drives the second rotating rod 19 to rotate through the meshing of the first gear 17 and the second gear 18, the protection net 10 stretches along with the rising of the telescopic protection plate 8, when the height of the telescopic protection plate 8 meets the current protection requirement, the double-shaft motor 12 is closed, the blanking plate 28 is loosened, the blanking plate 28 moves towards the protection net 10 under the action of the spring elasticity, the pressure on the protection net 10 is increased, and stone is prevented from entering the inside the shell 1 from the gaps.
When the protection net 10 and the telescopic protection plate 8 need to be retracted, the blanking plate 28 is pulled outwards, the pressure on one side of the protection net 10 is relieved by the side wall of the blanking plate 28, the double-shaft motor 12 is started, the output shaft of the double-shaft motor 12 rotates reversely to drive the two rotating shafts 13 to rotate reversely, the two rotating shafts 13 drive the telescopic protection plate 8 to move downwards, the second rotating rod 19 rotates reversely to enable the protection net 10 to wind on the second rotating rod 19, the toothed plate 27 is meshed with the third gear 24 all the time in the downward moving process of the telescopic protection plate 8, the third gear 24 is driven to rotate, the fourth rotating rod 26 is driven to rotate by the third gear 24, the third rotating rod 22 is driven to rotate by the cam 23, and in the rotating process of the cam 23, when the long end of the cam 23 rotates to the surface contact with the protection net 10, the protection net 10 is arched, the cam 23 continues to rotate the protection net 10 to restore the vertical state, so that the shaking action is formed, dust and stones on the protection net 10 are shaken off.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
1. The utility model provides a protector convenient to receive and close for colliery blasting, includes casing (1) and flexible guard plate (8) of setting on casing (1), its characterized in that, casing (1) upper end is equipped with the protection machanism that is used for blasting protection, protection machanism includes fixed guard plate (3) of fixed connection in casing (1) upper end, flexible guard plate (8) upper end fixedly connected with roof (6), roof (6) lower extreme fixedly connected with a plurality of solid fixed ring (7), a plurality of gu be equipped with protection network (10) on solid fixed ring (7) jointly, be equipped with the actuating mechanism that is used for driving flexible guard plate (8) to go up and down in casing (1), be equipped with the storage machanism that is used for accomodating protection network (10) in casing (1), fixed guard plate (3) upper end is equipped with the vibration mechanism that is used for trembling to fall the last stone of protection network (10), be equipped with the fixed machanism that is used for fixing protection network (10) on casing (1).
2. The protection device convenient to fold for coal mine blasting according to claim 1, wherein the driving mechanism is rotationally connected with two threaded rods (4) at the inner bottom of the shell (1), the two threaded rods (4) penetrate the upper end of the shell (1), two first baffles (2) are symmetrically and fixedly connected to the side wall of the telescopic protection plate (8), the two first baffles (2) are respectively located at two sides of the fixed protection plate (3), two side walls opposite to the first baffles (2) are respectively and fixedly connected with limiting plates (5), the two upper ends of the threaded rods (4) penetrate the upper ends of the limiting plates (5) at the same side, the two side walls opposite to the limiting plates (5) are respectively and fixedly connected with two side walls of the fixed protection plate (3), the two side walls of the threaded rods (4) located in the shell (1) are respectively and fixedly sleeved with first conical gears (11), two biaxial motors (12) are fixedly connected to the inner bottom of the shell (1), two rotating shafts (13) of the biaxial motors (12) are respectively and the rotating shafts (13) of the two biaxial motors are respectively and fixedly connected with the conical gears (13) at two sides of the two conical gears (13), and the two conical gears (13) can be respectively meshed with the two conical gears (11).
3. The protection device convenient to fold for coal mine blasting according to claim 2, wherein the storage mechanism comprises a first vertical plate (14) fixedly connected to the inner bottom of the shell (1), a first rotating rod (16) is rotatably connected to the side wall of the first vertical plate (14), a first gear (17) is fixedly connected to one end of the first rotating rod (16), a mounting opening is formed in the upper end of the shell (1), a mounting plate (20) is fixedly connected to the upper end of the shell (1) through a bolt, the mounting plate (20) is arranged opposite to the mounting opening, two first fixing plates (9) are symmetrically and fixedly connected to the lower end of the mounting plate (20), a second rotating rod (19) is rotatably connected to the side wall of the first fixing plates (9), the rotating shaft (13) is in transmission connection with the first rotating rod (16) through a first belt, one end of the second rotating rod (19) penetrates through the side wall of the first fixing plate (9) on the same side and is fixedly connected with a second gear (18) capable of being meshed with the first gear (17), and the second protection net (10) penetrates through the lower end of the second fixing plate (19) and is fixedly connected to the second protection net (19) through the side wall.
4. The protection device convenient to fold for coal mine blasting according to claim 1, wherein the vibration mechanism comprises two second vertical plates (21) fixedly connected to the upper end of the fixed protection plate (3), the two opposite side walls of the second vertical plates (21) are fixedly connected with a third rotating rod (22) in a rotating mode, the side walls of the third rotating rod (22) are fixedly sleeved with cams (23) at equal intervals, the upper end of the fixed protection plate (3) is fixedly connected with two third vertical plates (25), the two opposite side walls of the third vertical plates (25) are fixedly connected with a fourth rotating rod (26) in a rotating mode, the third rotating rod (22) is in transmission connection with the fourth rotating rod (26) through a second belt, the side walls of the fourth rotating rod (26) are fixedly sleeved with a third gear (24), and the telescopic protection plate (8) is fixedly connected with a toothed plate (27) which can be matched with the third gear (24).
5. A protection device for facilitating folding of a coal mine blasting according to claim 3, wherein the fixing mechanism comprises a second fixing plate (30) fixedly connected to the upper end of the casing (1), a sliding groove (32) is formed in the upper end of the casing (1), a sliding block (31) is slidably connected to the sliding groove (32), a moving plate (29) is fixedly connected to the upper end of the sliding block (31), and a blanking plate (28) is fixedly connected to the upper end of the moving plate (29).
6. The protection device for coal mine blasting, which is convenient to fold, is characterized in that two opposite side walls of the first baffle plates (2) are fixedly connected with second baffle plates (33), and two side walls of the fixed protection plate (3) are fixedly connected with third baffle plates (34).
7. The protection device for coal mine blasting, which is convenient to fold and collapse, according to claim 5, wherein the side wall of the second fixing plate (30) is elastically connected with the side wall of the moving plate (29) through a plurality of springs, the blanking plate (28) is obliquely arranged, and the mounting plate (20) is located below the blanking plate (28).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011457542.3A CN112611284B (en) | 2020-12-10 | 2020-12-10 | A protector that is used for colliery blasting to be convenient for receive and close |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011457542.3A CN112611284B (en) | 2020-12-10 | 2020-12-10 | A protector that is used for colliery blasting to be convenient for receive and close |
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| Publication Number | Publication Date |
|---|---|
| CN112611284A CN112611284A (en) | 2021-04-06 |
| CN112611284B true CN112611284B (en) | 2023-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011457542.3A Active CN112611284B (en) | 2020-12-10 | 2020-12-10 | A protector that is used for colliery blasting to be convenient for receive and close |
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| CN113047320B (en) * | 2021-05-17 | 2023-04-18 | 王常青 | Road slope surface protection device |
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| JP5415641B1 (en) * | 2013-05-23 | 2014-02-12 | 貞男 網島 | Protection device such as rockfall |
| CN107907022A (en) * | 2017-12-11 | 2018-04-13 | 贵州大学 | It is a kind of for colliery blasting easy to the protective device that folds |
| CN109300377A (en) * | 2018-10-23 | 2019-02-01 | 山东大学 | The rock-fall protection net pilot model apparatus of adjustable-angle |
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| CN112611284A (en) | 2021-04-06 |
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