CN108106506A - A kind of deep hole blasting essential safe type quick-burning charge device - Google Patents
A kind of deep hole blasting essential safe type quick-burning charge device Download PDFInfo
- Publication number
- CN108106506A CN108106506A CN201611050701.1A CN201611050701A CN108106506A CN 108106506 A CN108106506 A CN 108106506A CN 201611050701 A CN201611050701 A CN 201611050701A CN 108106506 A CN108106506 A CN 108106506A
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- China
- Prior art keywords
- deep hole
- safe type
- type quick
- guide head
- essential safe
- Prior art date
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- Pending
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- 238000005422 blasting Methods 0.000 title claims abstract description 26
- 239000003245 coal Substances 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000002360 explosive Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 230000001603 reducing effect Effects 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000011068 loading method Methods 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 3
- 239000004677 Nylon Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims 1
- 229920003023 plastic Polymers 0.000 claims 1
- 239000000843 powder Substances 0.000 abstract description 41
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 10
- 239000012634 fragment Substances 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 6
- 238000005553 drilling Methods 0.000 abstract description 6
- 238000009825 accumulation Methods 0.000 abstract description 5
- 230000000717 retained effect Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Remote Sensing (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Earth Drilling (AREA)
Abstract
A kind of deep hole blasting essential safe type quick-burning charge device, mainly includes：Guide head positioned at device front end, usually there are more coal petrography chip or fragments in the drilling that construction is completed, conical guide head can either be effectively prevented from the accumulation for causing coal petrography chip or fragment due to powder charge, and can reduce powder charge resistance smoothly completing in order to charging work；It positioned at the tail plug of device afterbody, can effectively weaken impact of the sealing of hole process to powder stick, powder stick is avoided to be crashed through spilling；Tube body can meet the powder charge needs of various length or aperture blasthole by increasing and decreasing pvc pipe body number or changing pvc pipe body diameter, adaptable to blasthole length and varying aperture；Safety rope can quickly pull out powder stick when card blasthole occurs, pulls apart and blows out line or primacord when fortuitous events, powder stick is avoided to be retained in blasthole, is effectively improved the anti-accident ability of powder charge process.The device has the characteristics that simple for process, easily operated, safe and reliable.
Description
Technical field
The present invention relates to one kind to be applied to engineering explosion field, especially a kind of essential safe type applied to deep hole blasting
Quick-burning charge device.
Background technology
During mining, high gassy and low permeability coal seam gas exceeding limit and actual mining face goaf large area are hanged
Top problem is to restrict two big key factors of Safety of Coal Mine Production, and it is to increase gas permeability of coal seam, weak to implement Advance presplitting explosion
Change one of major measure of tight roof.
Under normal circumstances, Advance presplitting blasting measures have the characteristics that big aperture, blasthole depth and explosive payload are big.In major diameter
A certain number of coal petrography chips or fragment would generally be left down in deep blasting hole work progress, when powder charge easily causes chip or fragment
Accumulation and block blasthole, therefore rational loading method is the key that influence deep drilling blasting procedure implementation result and security
One of factor.
Main loading method is to be pushed away permitted explosive for coal mine volume paragraph by paragraph using tamper when current mine implements drill eye blasting
Enter and powder charge is carried out in blasthole.Practice have shown that often occurs promotion remaining coal petrography chip in powder stick end during this method powder charge when using
Or fragment accumulation and the phenomenon that block blasthole, powder charge requirement can not be met；Meanwhile once occurs such as card big gun in powder charge process
It pulls apart and blows out line or primacord when unexpected situations in hole, it is difficult to the explosive having been loaded into blasthole be extracted completely, this not only can
Delay the duration, increase unnecessary human and material resources and economic input, will also serious threat mine safety in production.Therefore adopt
Not only it is related to deep hole blasting with a kind of essential safe type means for loading that can realize that deep hole, heavy dose, anti-accident ability are strong
Construction quality, be also related to the safety in production benefit of mine.
The content of the invention
In order to improve the anti-accident ability of deep hole, heavy dose of charge explosion, it is ensured that the safe construction of drill eye blasting, the present invention
A kind of essential safe type quick-burning charge device applied to deep hole blasting is proposed, which both there is perfect security protection to set
It is standby, it can effectively evade card blasthole that may be present in powder charge process, pull apart and blow out the security risks such as line or primacord,
Again can before powder charge sondage drilling quality, have the characteristics that construction technology is simple, safety coefficient is high, powder charge is fireballing.
The present invention solves above-mentioned technical problem and uses following technical scheme：
A kind of deep hole blasting essential safe type quick-burning charge device, mainly includes：
Guide head, the guide head is by cone-shaped end and a diameter of D3Stable column composition, wherein the cone-shaped end is
Quickly propelling for means for loading is realized for driveing coal petrography block that may be present in blasthole, maximum gauge D4, D4>D3；
More tube bodies join end to end meet the needs of storage explosive, the wherein pipe of front end between the more tube bodies
Body is connected to the stable column of the guide head, outer tube diameter D1；
Tail plug, the tail plug is by a diameter of D6Stable column and a diameter of D5Stern post composition, wherein the stable column of tail plug with
The tube body connection of rearmost end, D5>D6；
Safety rope, the safety rope are connected to the stable column of the guide head, are filled when catastrophe occurs for quickly pulling out
Medicine device.
Further, drilled through in the stable column of the guide head and the coupled tube body multiple corresponding steady
Solid hole, by the safety rope through with the connection of the firm guide head and the tube body from securement apertures.
Further, the diameter of the safety rope should be not more than the aperture of securement apertures.
Further, drilled through in the stable column of the tail plug and the coupled tube body multiple corresponding firm
Hole, and firm item is inserted into consolidate the connection of the tail plug and the tube body.
Further, the tail should set the notch that can intert and blow out line beyond the Great Wall, and without friendship between notch and securement apertures
Fork.
Further, the diameter of the firm item should be not more than the aperture of tail securement apertures beyond the Great Wall.
Further, it is D that one end of the tube body, which should set internal diameter,2Pipe body reducing end, and D1=D2。
Further, on the guide head stable column diameter D3The coupled tube body should be equal to or slightly less than
Internal diameter.
Further, the diameter D of tail stable column beyond the Great Wall6The interior of the coupled tube body should be equal to or slightly less than
Footpath.
Further, the material of the tube body includes PVC, and the material for being oriented to head and tail plug includes timber and hard is moulded
Material.
Further, the tube body is pvc pipe, and the guiding head and tail plug is wooden.
Further, the material of the safety rope is nylon rope, iron wire or steel wire.
Compared with prior art, the advantageous effect of a kind of deep hole blasting essential safe type quick-burning charge device of the invention
It is：
(1) this is used for the essential safe type quick-burning charge device of deep hole blasting mainly by guide head, tube body, tail plug and safety
Rope composition, it is simple in structure, easily operated, highly reliable；
(2) usually there are more coal and rock chip or fragment in the drilling that construction is completed, conical guide head can have
The accumulation for causing coal and rock chip or fragment due to powder charge is avoided to effect, reduces powder charge resistance, avoids artificially blocking blasthole, more have
Beneficial to smoothly completing for charging work；
(3) head and the tail connection can be realized by pipe body reducing end between more tube bodies to meet the need of various loaded lengths
Will, it is adaptable to loaded length, and the fixation of tube body can avoid the mutual changing of the relative positions between each powder stick, it is ensured that explosion is imitated
Fruit；
(4) setting of tail plug can effectively weaken impact of the sealing of hole process to powder stick, and powder stick is avoided to be hit because of packaging wrapper
Broken overflow mixes and weakening blast effect with impurity；
(5) by set safety rope can occur card blasthole, pull apart blow out line or primacord when fortuitous events when it is quick
Powder stick is pulled out, powder stick is avoided to be retained in blasthole, is effectively improved the anti-accident ability of powder charge process.
Description of the drawings
It is more fully described the preferred embodiment of the present invention in conjunction with the accompanying drawings, above-mentioned and other purposes of the invention,
Feature and advantage will be apparent, wherein, in exemplary embodiments of the present invention, the component that identical reference number represents
It is identical.
Fig. 1 is the essential safe type quick-burning charge apparatus structure schematic diagram that deep hole blasting is used in the embodiment of the present invention；
Fig. 2 is guide head structure diagram in the embodiment of the present invention.
Fig. 3 is tail plug structure schematic diagram in the embodiment of the present invention.
Fig. 4 is powder charge pipe structure diagram in the embodiment of the present invention.
Main Reference label declaration：
1- guide heads；2- tail plugs；3- tube bodies；4- safety ropes；5- blows out line；6- consolidates item；7- detonators；8- drug storage chambers；9-
Notch；10- securement apertures；11- pipe body reducings end；12- cone-shaped ends；13- stable columns；14- stern posts.
Specific embodiment
Embodiments of the present invention are explained in more detail below in conjunction with attached drawing and preferred embodiment.Although attached drawing
In show the preferred embodiment of the present invention, however the present invention may be realized in various forms, it is impossible to by reality set forth herein
Apply example limitation.On the contrary, provide these embodiments be in order to which the present invention is made to become apparent from and completely, and can be by the model of the present invention
It encloses and is intactly communicated to those skilled in the art.
Fig. 1, Fig. 2, Fig. 3 and Fig. 4 show a kind of essential safe type for deep hole blasting accoding to exemplary embodiment
Quick-burning charge device, mainly includes：Guide head 1, tail plug 2, tube body 3 and safety rope 4.
Usually there are more coal and rock chip or fragment, 12 energy of cone-shaped end of guide head 1 in the drilling that construction is completed
The accumulation for causing coal and rock chip or fragment due to powder charge is enough effectively prevented from, reduces powder charge resistance, avoids artificially blocking blasthole,
Be conducive to smoothly completing for charging work.
The stern post 14 of tail plug 2 can effectively weaken impact of the sealing of hole process to powder stick, and powder stick is avoided to be hit because of packaging wrapper
Broken overflow mixes and weakening blast effect with impurity.
Guide head 1 and tail plug 2 are all the connections realized by stable column 13 with tube body 3.
Multiple corresponding securement apertures 10 are drilled through respectively in the stable column of guide head 1 and the coupled tube body,
Safety rope 4 is passed through from securement apertures 10 with fixed guide first 1 and tube body 3.
It drills through multiple corresponding securement apertures 10 respectively in the stable column of tail plug 2 and the coupled tube body 3, uses
Firm item 6 fixes tail plug 2 and tube body 3.
One is interconnected to form in a manner of end to end between more tube bodies 3 by pipe body reducing end 11 to consolidate
Entirety, when powder charge, only needs to be packed into powder column in tube body in advance, then the designated position that device is pushed into blasthole can be completed
Powder charge process.
For smoothly interspersed safety rope 4 and firm item 6, the diameter of safety rope 4 and firm item 6 should be less than or equal to securement apertures 10
Aperture.
To give full play to the effect of safety rope 4, the length of safety rope 4 should be slightly bigger than blast hole depth.
To prevent guide head 1 from entering tube body 3, the maximum dimension D of cone-shaped end 12 in thrust inferior pyramidal end 124It should
More than the outer diameter for being attached thereto 3 end of tube body.
For prevent tail plug 2 under thrust stern post 14 enter tube body 3, stern post 14 is fixed on tube body with firm item 6,
And the diameter D of stern post 145It should be greater than being attached thereto the outer diameter of 3 end of tube body.
To ensure smoothly connect between guide head 1 and tail plug 2 and tube body 3, stable column 13 on guide head 1 and tail plug 2
Diameter should be equal to or slightly less than coupled tube body 3 internal diameter.
To eliminate tail plug 2 to blowing out the influence of line, should be set on tail plug 2 can intert the notch 9 for blowing out line, and notch 9
Without intersecting between securement apertures 10.
To make to be firmly attached between more tube bodies 3, the internal diameter of pipe body reducing end 11 should be equal to the outer of tube body 3
Footpath.
Embodiment
Certain deep hole blasting working face designs blast hole depth as 2700cm, blasthole diameter 7.5cm, and explosive column is a diameter of
4.5cm, loaded length 2000cm, sealed borehole length 700cm.Using as shown in Figure 1, Figure 2 and Figure 3 for deep hole blasting
Essential safe type quick-burning charge device, specific steps include：
Step 1：First, it is in the pvc pipe body of 200cm the stable column partial insertion length of guide head.Then, one is taken
No. 10 iron wires that segment length is 3000cm are used as safety rope, with iron wire one end through securement apertures guide head and front end pvc pipe
Body connects.Wherein, a diameter of 5.5cm of the upper conical end of guide head most butt end, a diameter of 5cm of stable column, pvc pipe body
Internal diameter is 5cm, wall thickness 0.1cm, total length 2800cm, is joined end to end successively between each pvc pipe body.
Step 2：The actual grade to drill in pvc pipe body push-in blasthole with detection, PVC is then extracted by safety rope
Tube body is simultaneously split.
Step 3：Powder stick with detonator according to Explosives Order is connected and is put into pvc pipe body, by increase tube body radical come
Reach the loaded length of requirement, consolidated after tube body afterbody installs tail plug with No. 10 iron wires, be then pushed into blasthole and complete powder charge.
Wherein, a diameter of 5.5cm of tail a diameter of 5cm of stable column, stern post beyond the Great Wall.
In conclusion a kind of deep hole blasting essential safe type quick-burning charge device of the preferred embodiment of the present invention is mainly by leading
It is formed to head, tail plug, pvc pipe body and iron wire, it is simple in structure, easily operated, highly reliable；The device can be used for before powder charge
The actual grade and hole quality of drilling are detected, in order to reasonably calculate powder charge and sealed borehole length；By increasing and decreasing pvc pipe body number
Mesh, change pvc pipe body diameter can meet various blasthole length, the powder charge needs of blasthole diameter, and blasthole diameter and aperture are become
Change adaptable；By set safety rope can occur card blasthole, pull apart blow out line or primacord when fortuitous events when it is quick
Powder stick is pulled out, powder stick is avoided to be retained in blasthole, is effectively improved the anti-accident ability of powder charge process.
Providing for above-mentioned technical proposal is intended merely to become apparent from, comprehensively describes embodiments of the present invention, for ability
For the technical staff in domain, application according to the present invention method and principle can easily make various types of improvement or change
Shape is not limited solely to the above-mentioned described method of specific embodiment of the present invention, therefore previously described mode is simply preferred, and
Not restrictive meaning.
Claims (7)
1. a kind of deep hole blasting essential safe type quick-burning charge device, mainly includes：
Guide head, the guide head are made of cone-shaped end and stable column, and wherein cone-shaped end is used to drive in blasthole and may deposit
Coal petrography block and realize quickly propelling for means for loading；
More tube bodies join end to end meet the needs of storage explosive between the more tube bodies, and wherein the tube body of front end connects
It is connected to the stable column of the guide head；
Tail plug, the tail plug are made of stable column and stern post, and for connecting the tube body, stern post pushes away wherein stable column for carrying
Send the external load applied during device；
Safety rope, the safety rope are connected to the stable column of the guide head, for quickly pulling out whole device.
A kind of 2. deep hole blasting essential safe type quick-burning charge device according to claim 1, which is characterized in that the guiding
The maximum gauge of upper conical end should be greater than being attached thereto the outer diameter of body portion, and on the guide head stable column diameter
It should be less than or equal to the internal diameter for being attached thereto body portion.
3. a kind of deep hole blasting essential safe type quick-burning charge device according to claim 1, which is characterized in that every described
One end of tube body sets reducing end, and the internal diameter of reducing end is equal to the outer diameter of the tube body other end.
A kind of 4. deep hole blasting essential safe type quick-burning charge device according to claim 1, which is characterized in that the tail plug
The diameter of upper stern post should be greater than being attached thereto the outer diameter of body portion, and the diameter of tail stable column beyond the Great Wall should be less than or be equal to
It is attached thereto the internal diameter of body portion.
A kind of 5. deep hole blasting essential safe type quick-burning charge device according to claim 1, which is characterized in that the tail plug
On be provided with the notch that can intert and blow out line, and without intersecting between notch and the securement apertures that are arranged in tail plug stable column.
A kind of 6. deep hole blasting essential safe type quick-burning charge device according to claim 1, which is characterized in that the guiding
It the stable column of head and is attached thereto on tube body and is provided with corresponding securement apertures, the safety rope is connected to guiding by securement apertures
On head.
7. according to a kind of any one of claim 1-6 deep hole blasting essential safe type quick-burning charge devices, which is characterized in that
The safety rope should have certain suppleness, and material includes nylon rope, iron wire and steel wire；The guide head and the tail plug
There should be certain intensity, material includes timber and rigid plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611050701.1A CN108106506A (en) | 2016-11-24 | 2016-11-24 | A kind of deep hole blasting essential safe type quick-burning charge device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611050701.1A CN108106506A (en) | 2016-11-24 | 2016-11-24 | A kind of deep hole blasting essential safe type quick-burning charge device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108106506A true CN108106506A (en) | 2018-06-01 |
Family
ID=62204060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611050701.1A Pending CN108106506A (en) | 2016-11-24 | 2016-11-24 | A kind of deep hole blasting essential safe type quick-burning charge device |
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| CN (1) | CN108106506A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108895934A (en) * | 2018-07-27 | 2018-11-27 | 中国矿业大学 | A kind of deep hole standing shot blasting charge method and device |
| CN109000517A (en) * | 2018-07-27 | 2018-12-14 | 中国矿业大学 | A kind of explosive cartridge of deep hole blasting |
| CN110196003A (en) * | 2019-07-02 | 2019-09-03 | 河南理工大学 | A kind of deep hole blasting quick-burning charge device and loading method |
| CN113882806A (en) * | 2021-12-01 | 2022-01-04 | 北京科技大学 | Retractable mesh-shaped hole protection piece, installation method of hole protection piece and hole protection method |
| CN113932672A (en) * | 2021-10-25 | 2022-01-14 | 浙江秦核环境建设有限公司 | Mine blasting charging means |
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| CN201662371U (en) * | 2009-12-07 | 2010-12-01 | 李凤仪 | Charging device for long drill hole blasting |
| CN105627852A (en) * | 2016-03-28 | 2016-06-01 | 宏大矿业有限公司 | Protecting device for explosive in high-temperature blasthole and using method of protecting device |
| CN105627847A (en) * | 2016-03-18 | 2016-06-01 | 中国矿业大学(北京) | Tamping bar for deep hole blasting charge |
| CN205388443U (en) * | 2016-03-22 | 2016-07-20 | 中煤科工集团淮北爆破技术研究院有限公司 | Light explodes downthehole bilinearity of fixing a position and gathers ability demolition unit |
| CN205664726U (en) * | 2016-05-09 | 2016-10-26 | 中国葛洲坝集团第六工程有限公司 | Powder charge pole |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201662371U (en) * | 2009-12-07 | 2010-12-01 | 李凤仪 | Charging device for long drill hole blasting |
| CN105627847A (en) * | 2016-03-18 | 2016-06-01 | 中国矿业大学(北京) | Tamping bar for deep hole blasting charge |
| CN205388443U (en) * | 2016-03-22 | 2016-07-20 | 中煤科工集团淮北爆破技术研究院有限公司 | Light explodes downthehole bilinearity of fixing a position and gathers ability demolition unit |
| CN105627852A (en) * | 2016-03-28 | 2016-06-01 | 宏大矿业有限公司 | Protecting device for explosive in high-temperature blasthole and using method of protecting device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108895934A (en) * | 2018-07-27 | 2018-11-27 | 中国矿业大学 | A kind of deep hole standing shot blasting charge method and device |
| CN109000517A (en) * | 2018-07-27 | 2018-12-14 | 中国矿业大学 | A kind of explosive cartridge of deep hole blasting |
| CN108895934B (en) * | 2018-07-27 | 2020-06-26 | 中国矿业大学 | Deep hole loosening blasting explosive loading method |
| CN110196003A (en) * | 2019-07-02 | 2019-09-03 | 河南理工大学 | A kind of deep hole blasting quick-burning charge device and loading method |
| CN110196003B (en) * | 2019-07-02 | 2023-06-16 | 河南理工大学 | Deep hole blasting quick drug loading device and drug loading method |
| CN113932672A (en) * | 2021-10-25 | 2022-01-14 | 浙江秦核环境建设有限公司 | Mine blasting charging means |
| CN113932672B (en) * | 2021-10-25 | 2023-02-24 | 浙江秦核环境建设有限公司 | Mine blasting charging means |
| CN113882806A (en) * | 2021-12-01 | 2022-01-04 | 北京科技大学 | Retractable mesh-shaped hole protection piece, installation method of hole protection piece and hole protection method |
| CN113882806B (en) * | 2021-12-01 | 2022-03-11 | 北京科技大学 | Retractable mesh-shaped hole protection piece, installation method of hole protection piece and hole protection method |
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