CN109489512B - Portable quick medicine loading energy-collecting device of flexible folding - Google Patents
Portable quick medicine loading energy-collecting device of flexible folding Download PDFInfo
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- CN109489512B CN109489512B CN201811605934.2A CN201811605934A CN109489512B CN 109489512 B CN109489512 B CN 109489512B CN 201811605934 A CN201811605934 A CN 201811605934A CN 109489512 B CN109489512 B CN 109489512B
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- pipe
- annular groove
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- 239000003814 drug Substances 0.000 title claims abstract description 26
- 239000002360 explosive Substances 0.000 claims abstract description 61
- 238000005422 blasting Methods 0.000 claims abstract description 25
- 229940079593 drug Drugs 0.000 claims abstract description 11
- 230000035515 penetration Effects 0.000 claims description 22
- 230000000694 effects Effects 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 239000011435 rock Substances 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 11
- 238000005474 detonation Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000009412 basement excavation Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 abstract 2
- 229910000831 Steel Inorganic materials 0.000 description 20
- 239000010959 steel Substances 0.000 description 20
- 239000003245 coal Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 230000000977 initiatory effect Effects 0.000 description 4
- 239000004005 microsphere Substances 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000007789 sealing Methods 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a deformable folding portable rapid drug loading energy accumulating device which comprises a deformable folding corrugated shaped charge liner, explosive and a detonation device. The liner is made of deformable folding corrugated pipe or pipe body with concave annular groove; the explosive is common explosive, and is filled into the tube body; the detonating device is a universal detonating device such as a detonator detonating cord and the like. The invention mainly aims to solve the problems of under-excavation, rock breaking, explosive energy utilization rate and cut blasting of medium-length hole blasting. In the drilling and blasting method, the ultra-deep of the blast hole can be reduced, the drilling cost is reduced, and the blast hole utilization rate is improved. The invention changes the traditional explosive charging mode and the explosive acting mode, releases energy in the design position and direction, improves the utilization rate of the explosive energy and saves the cost. The deformable folding corrugated shaped charge liner is simple in form, changeable in shape, easy to process, convenient to use, high in production efficiency and low in use cost.
Description
Technical Field
The invention belongs to the technical field of engineering blasting and ammunition engineering, and particularly relates to a deformable folding portable rapid drug loading energy gathering device.
Background
The blasting technology plays a great role in the foundation construction of China, and tunnel excavation, ore exploitation, subway construction, sea filling island construction and the like are all completed by blasting cooperation. The railway line and the highway line of China are long and complex, tunnels are required to be excavated when railways and highways are built, the stress of rocks or soil in the tunnels is large, and the blasting mode is convenient and quick to use. At present, more cities in China are used for subway construction, and mechanical means are difficult to operate in coastal cities and in some cities with harder geology, and the operation is still realized by using a blasting technology. The blasting means are adopted in coal mine and other ore exploitation to improve the production efficiency and reduce the cost.
Although the blasting technique is widely used and rapidly developed, the current blasting technique is still deficient, such as severe undermining, low explosive energy utilization rate, low blast hole utilization rate and the like. These problems in turn bring about corresponding secondary disasters, such as vibration hazards, environmental pollution, etc.
Based on these problems, some measures have been taken, and chinese patent CN102735121a presents a shaped charge cutter that can be used to perform deep hole pre-split blasting. The explosive is small in dosage, large in penetration depth and large in jet flow direction, and can form a plurality of longitudinal cracks to perform blasting by using the stress concentration effect and the rock compression and non-tension principle. Chinese patent CN103983153a shows a shell circumferential discontinuous energy-collecting jet fracturing device, which comprises a round tube-shaped shell, an end cap and a detonation device; the method has the characteristics of high explosive energy utilization rate, low cost and consumption, energy gathering orientation and the like. It can form a plurality of discontinuous annular jet penetrating the target body, so that the target body forms a plurality of dense cracks. Chinese patent CN107726936a shows a spiral shaped liner with which a shell is formed to be filled with explosive and a continuous spiral jet is formed to penetrate the rock mass. While many solutions have improved to some extent, the effect is still undesirable and new problems are associated. These inventions feature a stationary liner. Namely: the energy collecting device is manufactured in advance, and the used explosive is generally a finished explosive strip with different field working conditions, so that the energy collecting device cannot be quickly manufactured on site according to the method of the invention. The device is difficult to change in size, complex in manufacture, complex in operation, inconvenient to use, overlarge in cost and unfavorable for industrial mass production popularization, and the energy-gathering jet technology cannot be popularized and applied on site due to the problems. However, due to the generation principle of the energy accumulating jet, no deformable energy accumulating jet device is reported at present.
Disclosure of Invention
Aiming at the defects of the prior blasting technology, the invention aims to provide a deformable folding portable rapid drug loading energy gathering device. Through collapsible collection can structural design, realize gathering can the device can the purpose of scene quick charge. Specifically, the energy gathering cover is of a deformable corrugated structure, and the tip of the inner corrugation is provided with a puncture point. The device is a non-dangerous article in a non-charge shrinkage state, occupies small space and is convenient for transportation and management; when in use, the corrugated pipe is stretched, the pipe cavity is expanded and thickened, and the medicine strips can be filled; and then the compression corrugated pipe cavity is contracted, the tip puncture point punctures the medicine strip, the explosive in the medicine strip is extruded into the pipe, and the compression is stopped when the explosive fills the pipe cavity. Meanwhile, the medicine strips can be fixed by the penetrated corrugated parts, and the medicine strip positioning is facilitated. The energy-gathering corrugated structure for charging is placed inside the blast hole, the liner formed by the corrugation after detonation generates annular jet flow to form gaps on the rock wall, so that the problems of over-digging and under-digging of the blasting root can be well solved, and the workload and the dangerousness of subsequent engineering are reduced. The drill rod, the steel bar and other structures can be cut in special environments.
The aim of the invention is realized by the following technical scheme:
The portable rapid drug loading and energy gathering device capable of being deformed and folded comprises a deformable and folding corrugated shaped charge liner, explosive and a detonation device, wherein the deformable and folding corrugated shaped charge liner is a deformable and folding corrugated pipe or a pipe body with an inward concave annular groove; the cross section of the annular groove can be semicircular, wedge-shaped and other jet-forming shapes; the energy gathering device forms a compact annular jet by utilizing a deformable folding corrugated pipe or a concave annular groove of a pipe body with the concave annular groove; explosive is filled in the tube body; the detonating device is a detonating cord and a detonator and a detonating tube embedded in the end face of the detonating cord which are arranged in the middle of the explosive and are parallel to the axis.
Wherein, the flexible folding bellows-type liner can stretch and contract.
Wherein, the wall thickness of the tube body of the deformable folding corrugated shaped liner is 0.2 to 2.5mm, and the number of the corrugations is not less than 2; the maximum width of the corrugated section is not more than half of the maximum diameter of the pipe body, the minimum width of the corrugated section is not less than 1mm, the maximum height of the section opening is not more than half of the maximum diameter of the pipe body, the minimum width of the corrugated section is not less than 1mm, the minimum corrugated space of the pipe body is 0, and the corrugated space can be adjusted by practical application.
Wherein, the tip of the cross section of the annular groove of the deformable folding bellows-shaped liner is designed with a puncture point angle not more than 30 degrees, thereby ensuring the package of the puncturable medicine strip.
The deformable folding corrugated liner is provided with a concave annular groove after being stretched, and the cross section of the groove can be semicircular or wedge-shaped; the loading structure of the explosive can be further optimized to improve the penetration effect.
Wherein, the section height of the concave annular groove of the deformable folding bellows-shaped liner in the compressed state is h 1, the outer diameter of the tube is D, the inner diameter of the tube is D 1, and the outer diameter of the medicine strip is D 0. The relation between the height elongation of the corrugated pipe and the size of the liner is as follows:
compared with the prior art, the invention has the advantages that:
(1) The liner has the advantages of elasticity, easy processing, convenient carrying and simple operation, is filled with the liner in a compressed state, and then the corrugated pipe is stretched to finish filling.
(2) The shaped charge liner is special, the working mode of the explosive to the rock is changed, radial annular energy-collecting jet flow can be formed, and slits parallel to the direction perpendicular to the blast hole are punched in the blast hole.
(3) The shaped charge liner has the functions of gathering energy and restraining explosive by a tube shell, improves the utilization rate of materials, and saves the use cost.
(4) Compared with a linear charging structure, the corrugated pipe type liner has a dense annular jet effect, and a larger gap range is formed on the hole wall.
(5) The shape and the size of the shaped charge liner are flexible, the shape of the corrugated pipe can be changed according to actual needs, and the shaped charge liner can be designed into a cylinder, a cone, a round table and the like, and still has good penetration effect. The cross section of the groove of the corrugated pipe can be round or wedge-shaped, wherein the wedge-shaped angle can be designed and adjusted according to actual needs, and the corrugated pipe is convenient to control.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention.
Figure 2 is a cross-sectional view of a bellows-shaped charge with 5 annular grooves wedge-shaped cross-section.
Fig. 3 is a cross-sectional view of a corrugated pipe having a wedge-shaped cross-section in a compressed state.
Fig. 4 is a cross-sectional view of a wedge-section bellows shaped charge penetration steel plate.
Fig. 5 is a cross-sectional view of a wedge-section bellows shaped charge penetration steel tube.
Figure 6 is a cross-sectional view of a bellows-shaped charge with 5 annular grooves semi-circular cross-section.
The reference numerals in the drawings mean: 1 is detonator, 2 is bellows shaped liner, 3 is explosive, 4 is steel pipe, 5 is steel plate, 6 is puncture point.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
The invention relates to a foldable portable rapid drug loading energy gathering device which comprises a corrugated shaped liner 2, explosive 3 and a detonation device. The explosive 3 is a high-energy explosive and has the characteristics of high energy and high explosion speed; the corrugated shaped liner 2 is a pipe with annular grooves, more than 2 annular grooves are formed, and the cross section of each groove can be semicircular, wedge-shaped or other jet flow-forming shapes; the whole envelope curve of the corrugated shaped charge liner 2 is in the shape of a cylinder, a round table, a cone and the like; the hollow part of the corrugated liner 2 is filled with explosive 3, and a detonating device is arranged at the central axis part. The detonation device is a detonator 1.
When the invention is used, the invention is a non-dangerous article in a non-charge shrinkage state, and the invention occupies small space, thereby being convenient for transportation and management; when in use, the corrugated pipe is stretched, the pipe cavity is expanded and thickened, and the medicine strips can be filled; and then the compression corrugated pipe cavity is contracted, the tip puncture point punctures the explosive strip, the explosive in the explosive strip is extruded into the pipe, and the compression is stopped when the explosive is filled in the pipe cavity, so that the corrugated pipe energy-collecting explosive bag with the annular groove is formed and is applied to blasting engineering.
During the processing of the bellows-type liner 2, different dimensions may be selected according to different circumstances. In order to show penetration effect, the number of the annular grooves is generally more than 2, and the thickness of the circular tube is required to be 0.2-2.5 mm in order to ensure the quality of jet flow. The shape of the liner and the size of the inner diameter and the outer diameter are selected according to the diameter of the blast hole or other factors.
The shaped charge provided by the invention has the advantages that the explosive energy utilization rate is high when being used for rock-soil blasting, the generated cracks are more and more dense, and the problem of blasting root can be effectively solved. By calculating the hole distance and the drug loading quantity, the reasonable design can enable the crack generated by each shaped charge to be communicated, thereby achieving the purpose of crushing stone. After the rock generates cracks, the integral stress of the rock is redistributed, and stress concentration effect is generated in the subsequent process to lead the cracks to expand, and finally the rock mass to be broken. In the breaking mode, the explosive load can break the rock without reaching the breaking strength of the rock, and the dosage can be reduced. When the explosive gas acts on the cracks, the rock is subjected to tensile stress, and the rock is torn and falls off due to the small tensile strength of the rock, so that the explosive quantity can be reduced by the breaking mode. The cost can be saved due to the reduction of the drug loading amount, and the secondary disasters generated by explosion can be reduced, so that the vibration and pollution problems are improved.
According to engineering requirements, a blast hole can use a plurality of the shaped charges, and the size and throwing position of broken stones can be controlled through calculation and reasonable design of the size. The method meets the requirement of pre-splitting blasting and is easy to realize the preset target. The method can control the ore volume in the ore exploitation process, and is convenient for subsequent work such as transportation. When the reinforced concrete structure is demolished by blasting, the shaped charge can effectively cut the steel bars in the concrete, and the breaking rate of the blasting cut is improved.
The invention is mainly used in rock deep hole blasting and underground tunnel blasting excavation, and can also be used for mining coal bodies or other ores. The method can effectively control the size of coal mine mining, is convenient to transport and greatly improves the follow-up work for the deep hole pre-splitting blasting of the coal seam and the ore body. In the coal mining work, the coal seam gas burst danger can be reduced or eliminated, and the life safety of miners and mineral resources are ensured. In shale gas exploitation work, a plurality of dense apertures can be punched on a rock mass, so that the subsequent exploitation work is convenient.
The invention is further described below with reference to the drawings and examples.
Example 1:
Referring to FIG. 3, the inner diameter of the corrugated liner is 21.00mm and the height is 50mm, and the material of the corrugated liner is iron; the wedge-shaped section is 3mm in height and 4mm in width. The explosive is 4% glass microsphere sensitized emulsion explosive, after being uniformly mixed, the explosive is filled into the corrugated shaped charge liner for compaction, and the density is ensured to be 1.1g/cm 3 to 1.3g/cm 3. The experimental primer 1 without initiating explosive is detonated, and the primer 1 is placed in the center of the face of one end of the shaped charge.
The shaped charge of this example was subjected to a steel plate 5 penetration test, the steel plate 5 being 100mm long, 100mm wide, 15mm thick, penetration depth 3 to 4mm, penetration slit width 4 to 5mm, and steel plate 5 being 1 to 2mm concave. There are 5 penetration seams, the penetration on the detonation side is shallow, and the penetration on the other side is deep.
Example 2:
Referring to FIG. 4, the inner diameter of the corrugated shaped liner is 30mm and the height is 50mm, and the material of the corrugated shaped liner is aluminum; the wedge-shaped section is 5mm in height and 10mm in width. The explosive is 4% glass microsphere sensitized emulsion explosive, after being uniformly mixed, the explosive is filled into the corrugated shaped charge liner for compaction, and the density is ensured to be 1.1g/cm 3 to 1.3g/cm 3. The experimental primer 1 without initiating explosive is detonated, and the primer 1 is placed in the center of the face of one end of the shaped charge.
The shaped charge of this example was subjected to a steel pipe penetration test with an outer diameter of 57mm, a wall thickness of 4mm, and a length of 300mm. After test, the steel pipe parallel to the charging position has narrower bulges, the outer diameter is about 107mm, namely the pipe wall of the steel pipe extends outwards by 25mm, and the steel pipe is provided with tearing cracks along the axial direction of the steel pipe.
Example 3:
Referring to FIG. 3, the inner diameter of the corrugated shaped liner is 35mm and the height is 30mm, and the material of the corrugated shaped liner is plastic; the wedge-shaped section is 5mm in height and 7mm in width. The explosive is 4% glass microsphere sensitized emulsion explosive, after being uniformly mixed, the explosive is filled into the corrugated shaped charge liner for compaction, and the density is ensured to be 1.1g/cm 3 to 1.3g/cm 3. The experimental primer 1 without initiating explosive is detonated, and the primer 1 is placed in the center of the face of one end of the shaped charge.
The shaped charge of this embodiment was subjected to a steel plate 5 penetration test, the steel plate 5 being 300mm long, 100mm thick, 15mm thick, penetration depth being 1 to 2mm, penetration slit width being 2 to 3mm, the steel plate 5 not being significantly recessed, penetration slits being 5.
Example 4:
Referring to fig. 2, the outer diameter of the corrugated shaped charge liner is 35mm and the height is 30mm, and the material of the corrugated shaped charge liner is iron; the wedge-shaped section is 5mm in height and 5mm in width; the angle of the puncture point is 10 deg., and the length is about 3mm. The explosive is 4% glass microsphere sensitized emulsion explosive, after being uniformly mixed, the explosive is filled into a columnar plastic bag with the diameter of 30mm and the height of 30mm for sealing, and the density is ensured to be 1.1g/cm 3 to 1.3g/cm 3. The corrugated pipe is lengthened, the manufactured medicine strip is filled when the inner diameter of the corrugated pipe is 30mm, then the plastic bag of the medicine strip of the compressed corrugated pipe is punctured, and the corrugated pipe is filled with explosive. The experimental primer 1 without initiating explosive is detonated, and the primer 1 is placed in the center of the face of one end of the shaped charge.
The shaped charge of this embodiment was subjected to a steel plate 5 penetration test, the steel plate 5 being 300mm long, 100mm thick, 15mm thick, penetration depth being 1 to 2mm, penetration slit width being 2 to 3mm, the steel plate 5 not being significantly recessed, penetration slits being 5.
Claims (1)
1. The utility model provides a portable quick medicine loading of flexible folding gathers can device, includes flexible folding bellows-type liner (2), explosive (3), detonators, its characterized in that: the deformable folding corrugated liner is a deformable folding corrugated pipe with a concave annular groove; the cross section of the annular groove is wedge-shaped; the energy gathering device forms a compact annular jet by utilizing a concave annular groove of a deformable folding corrugated pipe with the concave annular groove; explosive is filled in the tube body; the detonating device is a detonating cord, a detonator with an embedded end face and a detonating tube which are arranged in the middle of the explosive and are parallel to the axis;
the deformable folding bellows-type liner can be stretched and contracted;
The wall thickness of the tube body of the deformable folding corrugated tubular shaped charge liner is 0.2-2.5 mm, and the number of corrugations is not less than 2; the maximum width of the corrugated section is not more than half of the maximum diameter of the pipe body, the minimum width of the corrugated section is not less than 1mm, the maximum height of the section opening is not more than half of the maximum diameter of the pipe body, the minimum width of the corrugated section is not less than 1mm, the minimum corrugated space of the pipe body is 0, and the corrugated space can be adjusted by practical application;
The deformable folding corrugated tubular shaped charge liner is provided with an inward concave annular groove after being stretched, and the section of the groove is wedge-shaped; the filling structure of the explosive is further optimized to improve the penetration effect;
The section height of the concave annular groove of the deformable folding corrugated shaped drug cover in the compressed state is h 1, the outer diameter of the tube is D, the inner diameter of the tube is D 1, the outer diameter of the drug strip is D 0, and the height and the elongation of the corrugated tube are as follows The relation with the liner size h 1,D,d1,d0 is:
，
wherein, the tip end of the cross section of the annular groove of the deformable folding bellows-shaped liner is designed with a puncture point angle not more than 30 degrees, so as to ensure the package of the puncturable medicine strip;
When the deformable folding portable rapid drug loading energy accumulating device is used, the device is a non-dangerous article in a non-drug loading shrinkage state, occupies small space and is convenient for transportation and management; when in use, the corrugated pipe is stretched, the pipe cavity is expanded and thickened, and the medicine strips can be filled; and then the compression corrugated pipe cavity is contracted, the tip puncture point punctures the explosive strip, the explosive in the explosive strip is extruded into the pipe, and the compression is stopped when the explosive is filled in the pipe cavity, so that the corrugated pipe energy-collecting explosive bag with the annular groove is formed and is applied to blasting engineering.
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| CN201811605934.2A CN109489512B (en) | 2018-12-26 | 2018-12-26 | Portable quick medicine loading energy-collecting device of flexible folding |
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| CN201811605934.2A CN109489512B (en) | 2018-12-26 | 2018-12-26 | Portable quick medicine loading energy-collecting device of flexible folding |
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| CN109489512B true CN109489512B (en) | 2024-06-14 |
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| CN110887420B (en) * | 2019-11-11 | 2022-06-07 | 刘梦 | Supplementary stifled explosive device that fills up of porthole |
| CN112393647A (en) * | 2020-11-05 | 2021-02-23 | 中国科学技术大学 | Self-tapping flexible energy-gathering blasting tube |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208083660U (en) * | 2018-04-03 | 2018-11-13 | 重庆顺安盛钛科技新材料有限公司 | Primer fixing device |
| CN210070765U (en) * | 2018-12-26 | 2020-02-14 | 中国科学技术大学 | Deformable folding portable quick charging energy-gathering device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2492829Y (en) * | 2001-08-22 | 2002-05-22 | 梁培根 | Mine water hole blasting device |
| CN103983153A (en) * | 2014-05-23 | 2014-08-13 | 中国科学技术大学 | Case circular discontinuous energy concentrating jet flow cracker |
| CN103968719A (en) * | 2014-05-23 | 2014-08-06 | 中国科学技术大学 | Integrated scattering type oriented explosion cylinder |
| KR101532321B1 (en) * | 2014-07-23 | 2015-06-30 | 국방과학연구소 | Output measuring device of explosive bellows |
| CN204421760U (en) * | 2014-12-04 | 2015-06-24 | 安徽理工大学 | A kind of spiral energy collecting type slotting powder column housing |
| CN107091600A (en) * | 2017-04-07 | 2017-08-25 | 安徽理工大学 | A kind of linear orientation jet cutter |
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| CN208083660U (en) * | 2018-04-03 | 2018-11-13 | 重庆顺安盛钛科技新材料有限公司 | Primer fixing device |
| CN210070765U (en) * | 2018-12-26 | 2020-02-14 | 中国科学技术大学 | Deformable folding portable quick charging energy-gathering device |
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Effective date of registration: 20190326 Address after: 230026 Jinzhai Road, Baohe District, Hefei, Anhui Province, No. 96 Applicant after: University of Science and Technology of China Applicant after: DARCH CONSTRUCTION GROUP CO.,LTD. Address before: 230026 Jinzhai Road, Baohe District, Hefei, Anhui Province, No. 96 Applicant before: University of Science and Technology of China |
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