CN115468471A - Blasting dust and flyrock protector - Google Patents
Blasting dust and flyrock protector Download PDFInfo
- Publication number
- CN115468471A CN115468471A CN202211081375.6A CN202211081375A CN115468471A CN 115468471 A CN115468471 A CN 115468471A CN 202211081375 A CN202211081375 A CN 202211081375A CN 115468471 A CN115468471 A CN 115468471A
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- China
- Prior art keywords
- protection
- protector
- flyrock
- plastic film
- film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005422 blasting Methods 0.000 title claims abstract description 34
- 239000000428 dust Substances 0.000 title claims abstract description 34
- 230000001012 protector Effects 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000002985 plastic film Substances 0.000 claims abstract description 32
- 229920006255 plastic film Polymers 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 230000001681 protective effect Effects 0.000 claims description 59
- 230000003139 buffering effect Effects 0.000 claims description 40
- 229920000742 Cotton Polymers 0.000 claims description 11
- 238000009941 weaving Methods 0.000 claims description 7
- 238000004806 packaging method and process Methods 0.000 claims 1
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 239000004575 stone Substances 0.000 description 37
- 239000010410 layer Substances 0.000 description 32
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000006378 damage Effects 0.000 description 6
- 208000027418 Wounds and injury Diseases 0.000 description 5
- 208000014674 injury Diseases 0.000 description 5
- 239000011241 protective layer Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D5/00—Safety arrangements
- F42D5/04—Rendering explosive charges harmless, e.g. destroying ammunition; Rendering detonation of explosive charges harmless
- F42D5/045—Detonation-wave absorbing or damping means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
The invention discloses a blasting dust and flyrock protection device, relates to the technical field of protection device structures, and aims to solve the problems that dust and flyrock generated during blasting of a building can not be effectively reduced when the existing building is blasted, so that environmental pollution is easily caused, and the generated flyrock is easily shot, so that surrounding workers are possibly injured. The utility model discloses a safety protection device for a vehicle, including protector, tether, buffer protection pad, protection device, film, water inlet seat, water outlet seat, protection device's both ends all are provided with the collar, connect the tether is installed to one side of collar, protector's one end is provided with buffer protection pad, one side that buffer protection pad is provided with the lag, protector's the other end is provided with the plastic film, the inside of plastic film is provided with the subdivision trace, the inside of subdivision trace is provided with the intercommunication groove, the front end of plastic film is provided with the film and goes out the water end, the top of plastic film is provided with the seat of intaking, the one end of the seat of intaking is provided with inhalant canal, the top of the seat of intaking is provided with the sealing device lid.
Description
Technical Field
The invention relates to the technical field of protective device structures, in particular to a blasting dust and flying stone protective device.
Background
The blasting is compression, loosening and damage caused by the blasting of explosives in air, water, soil and stone media or objects, a blasting demolition method is needed when the building is demolished in the building field, so that the building with a frame structure can be demolished and demolished, and gradual collapse of the building is realized by utilizing different detonation times among the stand columns, so that the demolition efficiency of the building is higher, and when the building is demolished, a protection device is needed for protection, so that the dust and the condition of flying stones can be effectively reduced.
The blasting flying stone safety protection device comprises a support bottom framework, wherein the support bottom framework consists of a cement base, U-shaped steel, connecting square steel and a reinforced inclined steel plate, inclined mounting frameworks are fixed on the U-shaped steel, an inclined top protection component is fixedly installed between the two inclined mounting frameworks, the inclined top protection component consists of an inclined protection steel mesh, a square tube and reinforced connecting steel, and a side protection steel mesh is fixedly installed on the outer sides of the inclined mounting frameworks; this blasting flying stone safety device can bear great rubble impact force, and also difficult deformation takes place when compressive capacity obtains the reinforcing, can be used to blasting personnel's protection, guarantees personnel's the security of the lives and property, and the security obtains further improvement, and this blasting flying stone safety device equipment is convenient, and it is convenient that the later stage is dismantled, and turnover is high, has fine popularization effect.
However, when the existing building is blasted, dust and flying stones generated during blasting of the building cannot be effectively reduced, so that environmental pollution is easily caused, and the generated flying stones are easily thrown to possibly injure surrounding workers, so that a blasting dust and flying stone protection device is urgently needed in the market to solve the problems.
Disclosure of Invention
The invention aims to provide a blasting dust and flying stone protection device, which solves the problems that the dust and flying stones generated during blasting of a building can not be effectively reduced when the existing building proposed in the background technology is blasted, so that environmental pollution is easily caused, and the generated flying stones are easily ejected so as to possibly cause injury to surrounding workers.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a blasting dust and flying stone protector, includes protector, protector's both ends all are provided with the collar, connect the tether to be installed to one side of collar, protector's one end is provided with the buffering protection pad, one side of buffering protection pad is provided with the lag, protector's the other end is provided with the plastic film, the inside of plastic film is provided with the dividing trace, the inside of dividing the trace is provided with the intercommunication groove, the front end of plastic film is provided with the film and goes out the water end, the top of plastic film is provided with the seat of intaking, the one end of seat of intaking is provided with inhalant canal, the top of the seat of intaking is provided with the sealing device lid.
Preferably, six of the mounting rings are provided, the six mounting rings being symmetrical about a vertical centre line of the guard.
Preferably, one end of the connecting tether penetrates through the mounting ring, and the connecting tether and the mounting ring are fixedly connected through a connecting wire.
Preferably, eight buffer protection pads are arranged at one end of the protection device, and the eight buffer protection pads are uniformly distributed at one end of the protection device.
Preferably, the number of the film water outlet ends is multiple, and the multiple film water outlet ends are uniformly distributed at the front end of the plastic film.
Preferably, the number of the water inlet seats is two, the two water inlet seats are symmetrical relative to the vertical center line of the plastic film, and the sealing device cover is fixedly connected with the water inlet seats through threads.
Preferably, the buffering protection pad comprises a buffering cotton layer, a protection wire layer and an outer protection layer, wherein the protection wire layer is arranged at two ends of the buffering cotton layer, and the outer protection layer is arranged at one end of the protection wire layer.
Preferably, the protective line layer comprises transverse protective lines and longitudinal protective lines, and the protective line layer is formed by cross weaving of the transverse protective lines and the longitudinal protective lines.
Preferably, the connecting tether is provided with six, six of said connecting tethers being symmetrical about a vertical centre line of the guard.
Preferably, the outer protective layer is formed by alternately weaving a transverse rubber protective pad and a longitudinal rubber protective pad, and the transverse rubber protective pad is fixedly connected with the longitudinal rubber protective pad through a connecting screw.
Compared with the prior art, the invention has the beneficial effects that:
1. this kind of blasting dust and flyrock protector, through the inside that lets in the plastic film with water from the seat of intaking, then seal the seat of intaking through the sealing device lid, again with protector around on the stand of the building that needs the blasting, make buffering protection pad one end contact with the stand outer wall, then tie tightly protector and stand through the connection tether of installation, then place other protector subaerial in stand one side, when blasting, stones such as stand receive the buffering of buffering protection pad, the condition that splashes appears in the stone after can avoiding blasting like this, thereby probably cause the injury to the staff, also can reduce the dust simultaneously, avoid the dust to scatter, thereby cause the pollution to the surrounding environment.
2. This kind of blasting dust and flyrock protector when the collision appears with the plastic film in the stone, makes the inside water extrusion plastic film of plastic film, and the water end that the film goes out this moment breaks easily, makes the water that lets in go out the water end blowout from the film, can effectively reduce the dust that the blasting in-process produced like this, can effectually reduce the dust that the blasting in-process produced through this kind of setting, can avoid the stone collision to take place the condition of flyshot simultaneously.
3. This kind of blasting dust and flying stone protector, the protective wire layer is alternately woven by horizontal protective wire and vertical protective wire and forms, can improve the structural strength on the cotton layer of buffering through the horizontal protective wire that sets up and vertical protective wire, make the stone when splashing, can hold the flying stone through the horizontal protective wire that sets up and vertical protective wire, can effectually prevent that the stone from taking place to splash like this, make the buffering protection pad when protecting like this, be difficult to appear breaking, thereby lead to the stone to pass the buffering protection pad and continue to take place the condition that splashes.
4. This kind of blasting dust and flying stone protector, outer inoxidizing coating are woven by horizontal rubber protection pad and vertical rubber protection pad alternately and are formed, and the intensity that horizontal rubber protection pad and vertical rubber protection pad through setting up can effectual improvement outer inoxidizing coating makes the stone when splashing, is difficult to penetrate and breaks buffering protection pad, can avoid appearing the condition that flies to penetrate to the stone like this to probably lead to the fact the injury to the staff.
Drawings
FIG. 1 is an overall front view of the present invention;
FIG. 2 is an overall rear view of the present invention;
FIG. 3 is an enlarged view of a portion of the area A of FIG. 1 in accordance with the present invention;
FIG. 4 is a partial cross-sectional view of a cushioning protective pad of the present invention;
FIG. 5 is a schematic diagram of a protective wire layer structure according to the present invention;
fig. 6 is a schematic structural diagram of an outer protective layer according to the present invention.
In the figure: 1. a guard; 2. a mounting ring; 3. connecting a tether; 4. a connecting wire; 5. a buffer protection pad; 501. a protective sleeve; 6. a plastic film; 601. dividing a cutting mark; 602. a communicating groove; 603. a water outlet end of the film; 604. a water inlet channel; 7. a water inlet seat; 8. a sealing device cover; 9. a buffer cotton layer; 10. a protective wire layer; 1001. a transverse guard line; 1002. a longitudinal guard line; 11. an outer protective layer; 1101. a transverse rubber protective pad; 1102. a longitudinal rubber protective pad; 12. and connecting screws.
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. 1-6, an embodiment of the present invention is shown: the utility model provides a blasting dust and flying stone protector, including protector 1, protector 1's both ends all are provided with collar 2, connection tether 3 is installed to one side of collar 2, protector 1's one end is provided with buffering protection pad 5, one side of buffering protection pad 5 is provided with lag 501, protector 1's the other end is provided with plastic film 6, the inside of plastic film 6 is provided with segmentation mark 601, the inside of segmentation mark 601 is provided with intercommunication groove 602, the front end of plastic film 6 is provided with film play water end 603, the top of plastic film 6 is provided with water inlet seat 7, the one end of water inlet seat 7 is provided with inhalant canal 604, the top of water inlet seat 7 is provided with sealing device lid 8.
Referring to fig. 1 and 2, six mounting rings 2 are provided, the six mounting rings 2 are symmetrical with respect to a vertical center line of the protection device 1, and the connecting tether 3 can be conveniently mounted through the mounted mounting rings 2, so that the protection device 1 can be conveniently mounted, and the protection device 1 is more convenient to use.
Referring to fig. 1 and 3, one end of a connecting tether 3 passes through the mounting ring 2, the connecting tether 3 and the mounting ring 2 are fixedly connected through a connecting wire 4, and the connecting tether 3 and the mounting ring 2 can be conveniently fixedly connected through the connecting wire 4, so that the protection device 1 can be tied to an upright post to be blasted through the connecting tether 3.
Please refer to fig. 2, the number of the buffering protection pads 5 is eight, the eight buffering protection pads 5 are uniformly distributed at one end of the protection device 1, and the building stones can be buffered when the building is blasted through the buffering protection pads 5, so that the building stones are prevented from splashing during blasting.
Referring to fig. 1, a plurality of film water outlets 603 are arranged, and the film water outlets 603 are uniformly distributed at the front end of the plastic film 6, so that the plastic film 6 can be squeezed to break the film water outlets 603 when being impacted during blasting, and water can be sprayed out from the film water outlets 603, thereby effectively reducing dust generated by blasting and avoiding scattering of a large amount of dust.
Referring to fig. 1 and 3, two water inlet seats 7 are provided, the two water inlet seats 7 are symmetrical with respect to the vertical center line of the plastic film 6, the sealing device cover 8 is fixed to the water inlet seats 7 through threaded connection, water can be conveniently introduced into the plastic film 6 through the water inlet seats 7, the plastic film 6 can be sealed through the sealing device cover 8, the introduced water is prevented from flowing out, and accordingly the dust removing effect is affected.
Please refer to fig. 4, the buffering protection pad 5 includes a buffering cotton layer 9, a protection wire layer 10 and an outer protection layer 11, the protection wire layer 10 is disposed at two ends of the buffering cotton layer 9, the outer protection layer 11 is disposed at one end of the protection wire layer 10, the structural strength of the buffering protection pad 5 can be effectively improved by the arrangement, so that the buffering protection pad 5 is not easy to break when protecting, thereby causing stones to pass through the buffering protection pad 5 to continue to splash, thereby being unable to well protect, and thus possibly causing injury to people around.
Please refer to fig. 5, the protection line layer 10 includes a horizontal protection line 1001 and a vertical protection line 1002, the protection line layer 10 is formed by alternately weaving the horizontal protection line 1001 and the vertical protection line 1002, the structural strength of the buffer cotton layer 9 can be improved through the horizontal protection line 1001 and the vertical protection line 1002, so that stones can be caught in splashing through the horizontal protection line 1001 and the vertical protection line 1002, which can effectively prevent the stones from splashing, thereby possibly causing injuries to people around.
Referring to fig. 1 and 2, six connecting tethers 3 are arranged, six connecting tethers 3 are symmetrical with respect to a vertical center line of the protection device 1, and the protection device 1 can be bound more firmly by the six connecting tethers 3, so that the situation that the protection device 1 is loosened is avoided, and the protection effect of the protection device 1 is affected.
Referring to fig. 6, the outer protection layer 11 is formed by alternately weaving a horizontal rubber protection pad 1101 and a longitudinal rubber protection pad 1102, the horizontal rubber protection pad 1101 is fixedly connected with the longitudinal rubber protection pad 1102 through a connecting screw 12, the strength of the outer protection layer 11 can be effectively improved through the arranged horizontal rubber protection pad 1101 and the longitudinal rubber protection pad 1102, so that stones are not easy to penetrate through the buffering protection pad 5 when splashing, the horizontal rubber protection pad 1101 and the longitudinal rubber protection pad 1102 can be conveniently installed and fixed through the arranged connecting screw 12, and the falling-off cleaning between the horizontal rubber protection pad 1101 and the longitudinal rubber protection pad 1102 is avoided, so that the protection effect of the outer protection layer 11 is influenced.
The working principle is as follows: when the protective film is used, water is introduced into the plastic film 6 from the water inlet seat 7, then the water inlet seat 7 is sealed through the sealing device cover 8, the protective device 1 is wound on a stand column of a building to be blasted, one end of the buffering protective pad 5 is in contact with the outer wall of the stand column, then the protective device 1 is tied with the stand column through the installed connecting tether 3, then other protective devices 1 are placed on the ground on one side of the stand column, when blasting is carried out, stones such as the stand column and the like are buffered by the buffering protective pad 5, the buffering protective pad 5 comprises the buffering cotton layer 9, the protective line layer 10 and the outer protective layer 11, the protective line layer 10 is arranged at two ends of the buffering cotton layer 9, the outer protective layer 11 is arranged at one end of the protective line layer 10, the structural strength of the buffering protective pad 5 can be effectively improved through the arrangement, the protective line 10 comprises the transverse protective line 1001 and the longitudinal protective line 1002, the protective line 10 is formed by alternately weaving the transverse protective line 1001 and the longitudinal protective line 1002, the protective line 1001 and the protective film 1002 can effectively prevent the stones from being splashed when the splashing caused by the splashing of the buffering protective film 6, the splashing water, the splashing of the buffering protective film 1002 can be easily caused by the collision of the buffering protective film 1002, and the buffering protective film 1002, the splashing of the buffering protective film, the splashing of the stones, thereby, the splashing of the buffering protective film, the stones, the splashing of the buffering protective film can be prevented from being easily occurring, the splashing protective film, the splashing protection film, when the splashing of the buffering protective film 6, the splashing protection film 603, through this kind of setting can effectual reduction blasting in-process produced dust, can avoid the stone collision to take place the condition of flying to penetrate simultaneously.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. The utility model provides a blasting dust and flyrock protector, includes protector (1), its characterized in that: the utility model discloses a plastic film packaging structure, including protector (1), protection device, film, water inlet seat, water outlet seat, protection device's (1) both ends all are provided with collar (2), connection tether (3) are installed to one side of collar (2), the one end of protector (1) is provided with buffering protection pad (5), one side of buffering protection pad (5) is provided with lag (501), the other end of protector (1) is provided with plastic film (6), the inside of plastic film (6) is provided with dividing cut mark (601), the inside of dividing cut mark (601) is provided with intercommunication groove (602), the front end of plastic film (6) is provided with film water outlet end (603), the top of plastic film (6) is provided with water inlet seat (7), the one end of water inlet seat (7) is provided with inhalant canal (604), the top of water inlet seat (7) is provided with sealing device lid (8).
2. The blast dust and flyrock protector of claim 1, wherein: six mounting rings (2) are arranged, and the six mounting rings (2) are symmetrical relative to the vertical center line of the protection device (1).
3. The blast dust and flyrock protector of claim 1, wherein: the connecting device is characterized in that one end of the connecting tether (3) penetrates through the mounting ring (2), and the connecting tether (3) and the mounting ring (2) are fixedly connected through a connecting wire (4).
4. The blast dust and flyrock protector of claim 1, wherein: the buffer protection pad (5) is provided with eight, eight buffer protection pads (5) are uniformly distributed at one end of the protection device (1).
5. The blast dust and flyrock protector of claim 1, wherein: the film water outlet ends (603) are arranged in number, and the film water outlet ends (603) are uniformly distributed at the front end of the plastic film (6).
6. The blasting dust and flyrock guard of claim 1, wherein: the two water inlet seats (7) are symmetrical relative to the vertical center line of the plastic film (6), and the sealing device cover (8) is fixedly connected with the water inlet seats (7) through threads.
7. The blast dust and flyrock protector of claim 1, wherein: the buffer protection pad (5) comprises a buffer cotton layer (9), a protection line layer (10) and an outer protection layer (11), wherein the protection line layer (10) is arranged at two ends of the buffer cotton layer (9), and the outer protection layer (11) is arranged at one end of the protection line layer (10).
8. The blast dust and flyrock protection device of claim 7, wherein: the protective line layer (10) comprises transverse protective lines (1001) and longitudinal protective lines (1002), and the protective line layer (10) is formed by cross weaving of the transverse protective lines (1001) and the longitudinal protective lines (1002).
9. The blast dust and flyrock protection device of claim 7, wherein: the connecting tether (3) is provided with six, and the six connecting tethers (3) are symmetrical relative to the vertical center line of the protection device (1).
10. The blast dust and flyrock protection device of claim 7, wherein: the outer protection layer (11) is formed by crosswise weaving a transverse rubber protection pad (1101) and a longitudinal rubber protection pad (1102), and the transverse rubber protection pad (1101) is fixedly connected with the longitudinal rubber protection pad (1102) through a connecting screw (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211081375.6A CN115468471A (en) | 2022-09-06 | 2022-09-06 | Blasting dust and flyrock protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211081375.6A CN115468471A (en) | 2022-09-06 | 2022-09-06 | Blasting dust and flyrock protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115468471A true CN115468471A (en) | 2022-12-13 |
Family
ID=84370580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211081375.6A Pending CN115468471A (en) | 2022-09-06 | 2022-09-06 | Blasting dust and flyrock protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115468471A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100927055B1 (en) * | 2009-06-11 | 2009-11-17 | 주식회사 코리아카코 | The multipurpose special protection materials for dust and rubble control used in explosive demolition |
| CN103712530A (en) * | 2013-12-30 | 2014-04-09 | 金陵科技学院 | Explosion protection device of building |
| CN103900431A (en) * | 2014-04-23 | 2014-07-02 | 大连经济技术开发区金源***工程有限公司 | Foundation pit blasting dust falling and slungshot preventing device and protecting method thereof |
| CN204666054U (en) * | 2015-04-30 | 2015-09-23 | 新蒲建设集团有限公司 | Demolishing buildings blasting protection system |
| CN205279904U (en) * | 2015-12-15 | 2016-06-01 | 山东科技大学 | Novel protection of blasting popping rock device |
| CN211084972U (en) * | 2019-06-13 | 2020-07-24 | 马文有 | Rubber pad net-shaped gun and quilt demolition blasting protection device |
-
2022
- 2022-09-06 CN CN202211081375.6A patent/CN115468471A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100927055B1 (en) * | 2009-06-11 | 2009-11-17 | 주식회사 코리아카코 | The multipurpose special protection materials for dust and rubble control used in explosive demolition |
| CN103712530A (en) * | 2013-12-30 | 2014-04-09 | 金陵科技学院 | Explosion protection device of building |
| CN103900431A (en) * | 2014-04-23 | 2014-07-02 | 大连经济技术开发区金源***工程有限公司 | Foundation pit blasting dust falling and slungshot preventing device and protecting method thereof |
| CN204666054U (en) * | 2015-04-30 | 2015-09-23 | 新蒲建设集团有限公司 | Demolishing buildings blasting protection system |
| CN205279904U (en) * | 2015-12-15 | 2016-06-01 | 山东科技大学 | Novel protection of blasting popping rock device |
| CN211084972U (en) * | 2019-06-13 | 2020-07-24 | 马文有 | Rubber pad net-shaped gun and quilt demolition blasting protection device |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20221213 |
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| RJ01 | Rejection of invention patent application after publication |