CN104265158A - Rock drill - Google Patents
Rock drill Download PDFInfo
- Publication number
- CN104265158A CN104265158A CN201410548573.8A CN201410548573A CN104265158A CN 104265158 A CN104265158 A CN 104265158A CN 201410548573 A CN201410548573 A CN 201410548573A CN 104265158 A CN104265158 A CN 104265158A
- Authority
- CN
- China
- Prior art keywords
- drilling rod
- interior
- sheathed
- drill
- gear
- 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.)
- Granted
Links
- 239000011435 rock Substances 0.000 title claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 119
- 230000005540 biological transmission Effects 0.000 claims description 21
- 230000033001 locomotion Effects 0.000 claims description 9
- 230000008450 motivation Effects 0.000 claims description 2
- 239000011148 porous material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000001141 propulsive effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a rock drill. The rock drill comprises a power mechanism, a main machine, a first driving mechanism and a second driving mechanism, wherein a drilling device is arranged on the main machine, and the first driving mechanism is connected with the power mechanism and drives the main machine to move in a straight line by a reciprocating manner; the drilling device comprises a hollow tubular external drilling rod and an internal drilling rod which are both driven to rotate through the second driving mechanism, wherein a hollow external drill bit is arranged at the front end of the external drilling rod; the internal drilling rod is arranged in the external drilling rod by a sleeving manner; the front end of the internal drilling rod extends from the front end of the external drilling rod; an internal drill bit is arranged at the front end of the internal drilling rod; the drilling diameter of the external drill bit is more than that of the internal drill bit. According to the rock drill, the internal drilling rod is used for drilling a small pore and the external drilling rod is used for drilling a large hole when drilling, and therefore, the drill can be stopped to replace the drill bit after drilling a large hole by working at a time, and as a result, the working efficiency of the drill is raised.
Description
Technical field
The present invention relates to a kind of rock drill technical field.
Background technology
The rock drill that current mining uses is a kind of is power with motor, and by reductor, propulsive mechanism, realize the rotary cutting operation of boring, it is primarily of compositions such as motor, reduction box and runways.Motor and reduction box are connected and are called main frame, by the operation on runway of sprocket wheel, chain, can tunnel mine laneway, the engineering such as metallurgical mining carries out bore operation.But existing rock drilling equipment, be generally carry out drilling by after power source speed change by single drilling rod front end den bohrkopf einsetzen, when drilling, disposable rig diameter can not be too large, when the hole that drilling is larger, need strengthen bit diameter gradually, cause effect low.
The information being disclosed in this background technology part is only intended to increase the understanding to general background of the present invention, and should not be regarded as admitting or imply in any form that this information structure has been prior art that persons skilled in the art are known.
Summary of the invention
The object of the present invention is to provide a kind of rock drill, thus when overcoming existing rig operation, disposable drill diameter can not be too large, during the hole needing drilling larger, need strengthen bit diameter gradually, cause the shortcoming that effect is low.
For achieving the above object, the invention provides a kind of rock drill, comprising: actuating unit and main frame, this main frame is provided with drill unit; And the first driving mechanism for driving described main frame to do linear reciprocating motion, it is connected with described actuating unit; Described drill unit comprises: outer drilling rod, and it is hollow tubular, and the front end of this outer drilling rod is provided with the outer drill bit of hollow; And interior drilling rod, it is sheathed in described outer drilling rod, and the front end of this interior drilling rod extends beyond the front end of described outer drilling rod, is provided with interior drill bit in the front end of described interior drilling rod, and the drill diameter of described outer drill bit is greater than the drill diameter of interior drill bit; Second driving mechanism, rotates for driving described outer drilling rod and interior drilling rod.
In technique scheme, the two ends of described interior drilling rod extend beyond the two ends of described outer drilling rod, and the direction of rotation of described interior drilling rod and outer drilling rod is contrary, and described second driving mechanism is the gearbox be connected with described actuating unit, described gearbox comprises: power transmission shaft, and it is connected with described actuating unit; First chain-wheel mechanism, it comprises the first sprocket wheel and the second sprocket wheel, and the chain cooperatively interacted with the first sprocket wheel and the second sprocket wheel, and described sprocket wheel is sheathed on described power transmission shaft, described second sprocket wheel be sheathed on extend beyond described outer drilling rod rear end interior drilling rod on; And gear mechanism, it comprises driving gear and driven gear, and described driving gear is sheathed on described power transmission shaft, and described driven gear is sheathed on described outer drilling rod.
In technique scheme, the gearratio of described first chain-wheel mechanism is 1:1, and the gear ratio of described gear mechanism is 2:1 ~ 4:1.
In technique scheme, described outer drilling rod is fixedly connected with interior drilling rod, and described second driving mechanism is the gearbox be connected with described actuating unit, and described gearbox comprises: power transmission shaft, and it is connected with described motivation mechanism; Gear mechanism, comprises driving gear and driven gear, and described driving gear is sheathed on described power transmission shaft, and described driven gear is sheathed on described outer drilling rod.
In technique scheme, described main frame is located in frame, and described frame is provided with slideway, and drives described main frame to slide on the slideway of described frame by described first driving mechanism.
In technique scheme, described first driving mechanism comprises: the second chain-wheel mechanism, and it is located in described frame, cooperatively interacts with the slideway of described frame, drives described main frame to do straight reciprocating motion on described slideway; And reduction box, it is connected with described chain-wheel mechanism, for controlling the speed that described host machine integral moves on described rack slide, is provided with the support slipper with chain-wheel mechanism synchronously movement on described slideway below described gearbox.
In technique scheme, described outer drilling rod is sheathed on one in the mode that can slide and is fixedly installed on supporting seat in described frame.
Compared with prior art, the present invention has following beneficial effect:
(1) rock drill of the present invention, the outer drilling rod during drill unit comprises outer drilling rod and overlaps drilling rod outside, during boring, interior drilling rod bores aperture, and outer drilling rod bores macropore, makes rig work once can the larger hole of drilling, stop bit change, improves the operating efficiency of rig.
(2) interior drilling rod exceeds the two ends of outer drilling rod, adopt gearbox to control the rotating speed of interior drilling rod and outer drilling rod respectively, the rotating speed of interior drilling rod is higher than the rotating speed of outer drilling rod, and the direction of rotation of outer drilling rod and interior drilling rod is contrary, rotate the reaction force produced to cancel out each other, rig is operated steadily.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of the present invention rock drill.
Fig. 2 is the structural representation of the another kind of embodiment rock drill of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention not by the restriction of detailed description of the invention.
Clearly represent unless otherwise other, otherwise in whole manual and claims, term " comprise " or its conversion as " comprising " or " including " etc. by be understood to include the element of stating or ingredient, and do not get rid of other element or other ingredient.
As shown in Figure 1, according to a kind of rock drill of the specific embodiment of the invention, comprising: actuating unit 1 (motor) and main frame 2, this main frame is provided with drill unit 7; And the first driving mechanism 3 for driving described main frame 1 to do linear reciprocating motion, it is connected with described actuating unit 1; Described drill unit 7 comprises: outer drilling rod 71, and it is hollow tubular, and the front end of this outer drilling rod 71 is provided with the outer drill bit 72 of hollow; And interior drilling rod 73, it is sheathed in described outer drilling rod 71, and the front end of this interior drilling rod 73 extends beyond the front end of described outer drilling rod 71, be provided with interior drill bit 74 in the front end of described interior drilling rod 73, the drill diameter of described outer drill bit 71 is greater than the drill diameter of interior drill bit 73; Second driving mechanism, rotates for driving described outer drilling rod 71 and interior drilling rod 73.
A reasonable embodiment is, as shown in Figure 1, the front and back end of described interior drilling rod 73 extends beyond the front and back end of described outer drilling rod 71 respectively, interior drilling rod 73 is not connected with outer drilling rod 71, the direction of rotation of interior drilling rod 73 and outer drilling rod 71 is contrary, and described second driving mechanism is the gearbox 4 be connected with described actuating unit 1, and described gearbox 4 comprises: power transmission shaft 41, its left end is connected with described actuating unit 1, and right-hand member is fixed in the casing of gearbox 4; First chain-wheel mechanism 42, it comprises the first sprocket wheel 421 and the second sprocket wheel 422, and with the first sprocket wheel 421 and the intermeshing chain 423 of the second sprocket wheel 422, described first sprocket wheel 421 is sheathed on described power transmission shaft 41, described second chain wheel case 422 be located at extend beyond described outer drilling rod 71 rearward end interior drilling rod 73 on, the rear end of interior drilling rod 73 passes outside gearbox 4, and interior drilling rod 73 is fixed with gearbox 4 junction bearing support 45.Power is passed to power transmission shaft 41 by actuating unit 1, and power transmission shaft 41 rotates, and power transmission shaft 41 drives the first sprocket wheel 421 to rotate together, and the first sprocket wheel 421 drives the second sprocket wheel 422 to rotate, and the second sprocket wheel 422 drives interior drilling rod 73 to rotate; And second gear mechanism 43, it comprises the second driving gear 431 and the second driven gear 432, second driving gear 431 and the second driven gear 432 engage each other, described second driving gear 431 is sheathed on described power transmission shaft 41, and described second driven gear 432 is sheathed on described outer drilling rod 71.Power transmission shaft 41 drives the second driving gear 431 to rotate together, and the second driving gear drives 431 to drive the second driven gear 432 to rotate, and the second driven gear 432 drives interior drilling rod 73 to rotate.The direction of rotation of interior drilling rod 73 and outer drilling rod 71 is contrary, rotates the reaction force produced and cancels out each other, rig is operated steadily.Bearing support 44, be located in gearbox, it comprises inner bearing 441 and outer bearing 442, the rear end of outer drilling rod 71 is fixed in gearbox 4 by outer bearing 442, interior drilling rod 73 overlaps outside in drilling rod 71, through the centre of the second driven gear 432, second sprocket wheel 422, interior drilling rod 73 is fixed by inner bearing 441, and the outer wall of inner pedestal contacts with outer drilling rod 71.Thus, maintain interior drilling rod and the good axiality of outer drilling rod, operate steadily when rig is worked.
In technique scheme, the gear ratio of described first chain-wheel mechanism 42 is 1:1, and the gear ratio of described second gear mechanism 43 is 2:1 ~ 4:1.
Another reasonable embodiment is, as shown in Figure 2, the front end of interior drilling rod 73 extends beyond the front end of outer drilling rod 71, described outer drilling rod 71 is fixedly connected with interior drilling rod 73, described second driving mechanism 4 is the gearbox 4 be connected with described actuating unit 1, described gearbox 4 comprises: power transmission shaft 41, and its one end is connected with described actuating unit 1, and the other end is fixed in the casing of gearbox 4; Gear mechanism 42, comprises driving gear 421 and driven gear 422, and described driving gear 421 is sheathed on described power transmission shaft 41, and described driven gear 421 is sheathed on described outer drilling rod 71.Outer drilling rod 71 rear end is located in gearbox 4 by the bearing on bearing support 44.Power is passed to power transmission shaft 41 by actuating unit 1, and power transmission shaft 41 rotates, and moving axis 41 drives driving gear 421 to rotate together, and driving gear drives 421 to drive driven gear 422 to rotate, and driven gear 422 drives outer drilling rod 71 to rotate.
Another good embodiment is, as depicted in figs. 1 and 2, described main frame 2 is located in frame 5, and described frame 5 is provided with slideway 51, and drives described main frame 2 to slide on the slideway 51 of described frame by described first driving mechanism 3.Described first driving mechanism 3 comprises: the second chain-wheel mechanism 31, and it is located in described frame 5, cooperatively interacts with the slideway 51 of described frame, drives described main frame 2 to do straight reciprocating motion on described slideway 51; And reduction box 32, it comprises the belt pulley set 321 be made up of small belt pulley 3211 and big belt pulley 3212, small belt pulley 3211 is connected with actuating unit 1, sprocket wheel 322 is provided with in the centre of big belt pulley 3212, sprocket wheel 323 and sprocket wheel 324 are provided with the left and right sides of big belt pulley 3212, the chain of chain-wheel mechanism 31 engages with the bottom of sprocket wheel 323, the top of linking sprocket wheel 322 is again engaged with, be connected to the bottom of sprocket wheel 324, control the rotating speed of belt pulley set 321 with actuating unit 1, the translational speed of chain-wheel mechanism 31 on rack slide 51 can be controlled.Below described gearbox 4, be provided with the support slipper 33 with the synchronous movement on described slideway of chain-wheel mechanism 31, control the speed that described host machine integral moves on described rack slide 51.During rig work, actuating unit 1 (motor) is connected with reduction box 32, and reduction box 32 is connected with the chain of chain-wheel mechanism 31, and chain is slided on the slideway 51 of frame, the support slipper 33 be positioned at bottom gearbox is slided on slideway 51, thus realizes the movable of drilling rod.By controlling gearbox, the speed of drilling rod drilling can be controlled.
In technique scheme, described outer drilling rod 71 is sheathed on one in the mode that can slide and is fixedly installed on supporting seat 6 in described frame 5.
The aforementioned description to concrete exemplary of the present invention is to illustrate and the object of illustration.These descriptions not want the present invention to be defined as disclosed precise forms, and obviously, according to above-mentioned instruction, can much change and change.The object selected exemplary embodiment and describe is to explain certain principles of the present invention and practical application thereof, thus those skilled in the art can be realized and utilize various different exemplary of the present invention and various different selection and change.Scope of the present invention is intended to limited by claims and equivalents thereof.
Claims (7)
1. a rock drill, comprising: actuating unit and main frame, and this main frame is provided with drill unit; And the first driving mechanism for driving described main frame to do linear reciprocating motion, it is connected with described actuating unit; It is characterized in that, described drill unit comprises:
Outer drilling rod, it is hollow tubular, and the front end of this outer drilling rod is provided with the outer drill bit of hollow; And
Interior drilling rod, it is sheathed in described outer drilling rod, and the front end of this interior drilling rod extends beyond the front end of described outer drilling rod, is provided with interior drill bit in the front end of described interior drilling rod, and the drill diameter of described outer drill bit is greater than the drill diameter of interior drill bit;
Second driving mechanism, rotates for driving described outer drilling rod and interior drilling rod.
2. rock drill according to claim 1, it is characterized in that, the two ends of described interior drilling rod extend beyond the two ends of described outer drilling rod, and the direction of rotation of described interior drilling rod and outer drilling rod is contrary, described second driving mechanism is the gearbox be connected with described actuating unit, and described gearbox comprises:
Power transmission shaft, it is connected with described actuating unit;
First chain-wheel mechanism, it comprises the first sprocket wheel and the second sprocket wheel, and the chain cooperatively interacted with the first sprocket wheel and the second sprocket wheel, and described sprocket wheel is sheathed on described power transmission shaft, described second sprocket wheel be sheathed on extend beyond described outer drilling rod rear end interior drilling rod on; And
Gear mechanism, it comprises driving gear and driven gear, and described driving gear is sheathed on described power transmission shaft, and described driven gear is sheathed on described outer drilling rod.
3. rock drill according to claim 2, is characterized in that, the gearratio of described first chain-wheel mechanism is 1:1, and the gear ratio of described gear mechanism is 2:1 ~ 4:1.
4. rock drill according to claim 1, is characterized in that, described outer drilling rod is fixedly connected with interior drilling rod, and described second driving mechanism is the gearbox be connected with described actuating unit, and described gearbox comprises:
Power transmission shaft, it is connected with described motivation mechanism;
Gear mechanism, comprises driving gear and driven gear, and described driving gear is sheathed on described power transmission shaft, and described driven gear is sheathed on described outer drilling rod.
5. rock drill according to claim 1, is characterized in that, described main frame is located in frame, and described frame is provided with slideway, and drives described main frame to slide on the slideway of described frame by described first driving mechanism.
6. rock drill according to claim 5, is characterized in that, described first driving mechanism comprises:
Second chain-wheel mechanism, it is located in described frame, cooperatively interacts with the slideway of described frame, drives described main frame to do straight reciprocating motion on described slideway; And
Reduction box, it is connected with described chain-wheel mechanism, for controlling the speed that described host machine integral moves on described rack slide, is provided with the support slipper with chain-wheel mechanism synchronously movement on described slideway below described gearbox.
7. rock drill according to claim 5, is characterized in that, described outer drilling rod is sheathed on one in the mode that can slide and is fixedly installed on supporting seat in described frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410548573.8A CN104265158B (en) | 2014-10-16 | 2014-10-16 | rock drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410548573.8A CN104265158B (en) | 2014-10-16 | 2014-10-16 | rock drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104265158A true CN104265158A (en) | 2015-01-07 |
| CN104265158B CN104265158B (en) | 2017-03-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410548573.8A Active CN104265158B (en) | 2014-10-16 | 2014-10-16 | rock drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104265158B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285466A (en) * | 2015-06-09 | 2017-01-04 | 宁波高新区利威科技有限公司 | A kind of intelligence rig |
| CN108979656A (en) * | 2018-08-03 | 2018-12-11 | 李二猛 | A kind of plane soil machine for jacking construction |
| CN108979655A (en) * | 2018-08-03 | 2018-12-11 | 李二猛 | A kind of drilling equipment for jacking construction |
| CN111894455A (en) * | 2020-08-28 | 2020-11-06 | 蔡克贤 | Drilling equipment for rock |
| CN113446023A (en) * | 2021-06-09 | 2021-09-28 | 重庆宏工工程机械股份有限公司 | Drilling splitting machine |
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|---|---|---|---|---|
| JPH07243295A (en) * | 1994-03-07 | 1995-09-19 | Kameyama:Kk | Boring rod |
| JPH11173059A (en) * | 1997-12-12 | 1999-06-29 | Ohbayashi Corp | Drilling method and coupling therefor |
| EP1124037A1 (en) * | 2000-02-08 | 2001-08-16 | Günter Prof. Dr.-Ing. Klemm | Drilling device |
| CN202125261U (en) * | 2011-05-10 | 2012-01-25 | 长沙通石达机械制造有限公司 | Horizontal down-the-hole drilling machine |
| CN202451047U (en) * | 2012-03-06 | 2012-09-26 | 楚顺利 | All-hydraulic double-pole soft coal drilling machine |
| CN102996084A (en) * | 2012-11-25 | 2013-03-27 | 桂林市华力重工机械有限责任公司 | Chain transmission device of rock drilling machine |
| CN204266910U (en) * | 2014-10-16 | 2015-04-15 | 天峨县平昌生态农业有限公司 | rock drill |
-
2014
- 2014-10-16 CN CN201410548573.8A patent/CN104265158B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07243295A (en) * | 1994-03-07 | 1995-09-19 | Kameyama:Kk | Boring rod |
| JPH11173059A (en) * | 1997-12-12 | 1999-06-29 | Ohbayashi Corp | Drilling method and coupling therefor |
| EP1124037A1 (en) * | 2000-02-08 | 2001-08-16 | Günter Prof. Dr.-Ing. Klemm | Drilling device |
| CN202125261U (en) * | 2011-05-10 | 2012-01-25 | 长沙通石达机械制造有限公司 | Horizontal down-the-hole drilling machine |
| CN202451047U (en) * | 2012-03-06 | 2012-09-26 | 楚顺利 | All-hydraulic double-pole soft coal drilling machine |
| CN102996084A (en) * | 2012-11-25 | 2013-03-27 | 桂林市华力重工机械有限责任公司 | Chain transmission device of rock drilling machine |
| CN204266910U (en) * | 2014-10-16 | 2015-04-15 | 天峨县平昌生态农业有限公司 | rock drill |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285466A (en) * | 2015-06-09 | 2017-01-04 | 宁波高新区利威科技有限公司 | A kind of intelligence rig |
| CN108979656A (en) * | 2018-08-03 | 2018-12-11 | 李二猛 | A kind of plane soil machine for jacking construction |
| CN108979655A (en) * | 2018-08-03 | 2018-12-11 | 李二猛 | A kind of drilling equipment for jacking construction |
| CN108979656B (en) * | 2018-08-03 | 2020-07-21 | 临泉县贝拉蜜家纺有限公司 | A dig native machine for push pipe construction |
| CN111894455A (en) * | 2020-08-28 | 2020-11-06 | 蔡克贤 | Drilling equipment for rock |
| CN111894455B (en) * | 2020-08-28 | 2022-09-16 | 崇义县高坌长飞矿业有限公司华山页岩矿 | Drilling equipment for rock |
| CN113446023A (en) * | 2021-06-09 | 2021-09-28 | 重庆宏工工程机械股份有限公司 | Drilling splitting machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104265158B (en) | 2017-03-22 |
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Effective date of registration: 20191115 Address after: No.206 Yaoshang village, Gulou District, Nanjing City, Jiangsu Province Patentee after: Li Jianbin Address before: Eight La eight La Xiang 547302 the Guangxi Zhuang Autonomous Region Tian'e County Hechi Haruki Tun Village Patentee before: Pingchang, Tiane County ecological agriculture Co., Ltd |
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Effective date of registration: 20200402 Address after: 628000 no.25-1, office building 1, Wanda Plaza (West Area), south of Binhe Road, Wanyuan New District, Dongba office, Lizhou District, Guangyuan City, Sichuan Province Patentee after: SICHUAN HUA ZEYUAN MINING Co.,Ltd. Address before: No.206 Yaoshang village, Gulou District, Nanjing City, Jiangsu Province Patentee before: Li Jianbin |
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