CN110887375B - Plant ash sintering device - Google Patents
Plant ash sintering device Download PDFInfo
- Publication number
- CN110887375B CN110887375B CN201911315321.XA CN201911315321A CN110887375B CN 110887375 B CN110887375 B CN 110887375B CN 201911315321 A CN201911315321 A CN 201911315321A CN 110887375 B CN110887375 B CN 110887375B
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- Prior art keywords
- furnace body
- sintering
- furnace
- frame
- end cover
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- 238000005245 sintering Methods 0.000 title claims abstract description 62
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 239000000428 dust Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 13
- 230000007723 transport mechanism Effects 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 230000007246 mechanism Effects 0.000 abstract description 18
- 241000196324 Embryophyta Species 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 244000025254 Cannabis sativa Species 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/02—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated of multiple-chamber type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
- F27B5/12—Arrangement of devices for charging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
- F27B5/18—Arrangement of controlling, monitoring, alarm or like devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/04—Sintering
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Furnace Charging Or Discharging (AREA)
- Tunnel Furnaces (AREA)
Abstract
The invention discloses a plant ash sintering device which comprises a frame, a conveying mechanism arranged on the frame and a plurality of sintering furnaces arranged on the conveying mechanism, wherein each sintering furnace comprises a furnace body vertically arranged on the conveying mechanism, an upper end cover hinged to the top end of the furnace body and a lower end cover hinged to the bottom end of the furnace body, high-temperature resistant sealing rings matched with the upper end cover and the lower end cover are arranged on the end faces of the top end and the bottom end of the furnace body, the furnace body is hollow, a supporting edge hinged to the conveying mechanism is machined on the outer wall of the furnace body, an ignition device is arranged on the bottom surface of the upper end cover, a feeding device matched with the sintering furnace is arranged on the frame, and a pressure control device for adjusting the pressure intensity in the furnace body is arranged on the side wall of the furnace body. According to the invention, the plurality of sintering furnaces are arranged on the conveying mechanism, and the upper end cover and the lower end cover on each sintering furnace can stabilize the sintering environment in each sintering furnace, so that the consistency of products produced by the plurality of sintering furnaces is ensured, and the quality of sintered products is ensured.
Description
Technical Field
The invention relates to the field of sintering devices, in particular to a plant ash sintering device.
Background
The sintering is to make the powdery material be in a certain geometrical shape and a firm process by mutually bonding particles among blanks and transferring substances under the action of high temperature lower than the melting point, the purpose of the sintering is to convert the powdery material into a compact body, however, the condition during the sintering has important influence on the later-stage forming of the powdery material, and the quality of the sintered product is unstable due to the influence of the sealing property and the sintering environment of the existing sintering device.
In addition, the existing sintering device can generate a large amount of smoke in the sintering process, and the existing sintering device is large in size, so that the smoke is easy to diffuse, and finally air pollution is caused.
Disclosure of Invention
The invention aims to provide a plant ash sintering device with adjustable sintering conditions.
The invention aims at realizing the following technical scheme:
The utility model provides a plant ash sintering device, includes the frame, installs the transport mechanism in the frame and installs a plurality of fritting furnaces on transport mechanism, the fritting furnaces including vertical furnace body that installs on transport mechanism, articulated upper end cover on the furnace body top and articulated the lower extreme cover in the furnace body bottom, be equipped with on the terminal surface of furnace body top and bottom with upper end cover and lower end cover complex high temperature resistant sealing washer, the furnace body cavity, processing has on the outer wall of furnace body with transport mechanism articulated support edge, the bottom surface of upper end cover is equipped with ignition, be equipped with in the frame with fritting furnace complex loading attachment, be equipped with the accuse pressure equipment of adjusting the furnace body internal pressure on the lateral wall of furnace body.
The feeding device comprises a feeding bin, a distributing plate arranged in the feeding bin and a discharging pipe connected with the furnace body, wherein the distributing plate is two, the two distributing plates are all hinged in the feeding bin, the bottom surface of each distributing plate is provided with an electric telescopic arm for driving the distributing plate to rotate, and the discharging pipe is arranged at the bottom of the feeding bin.
The pressure control device comprises a pressure-resistant pipe communicated with the upper part of the furnace body and an electromagnetic sealing valve arranged on the pressure-resistant pipe, one end of the pressure-resistant pipe, far away from the furnace body, is provided with a conical quick-release joint, a sucking pump and an inflating tank which are matched with the quick-release joint are arranged on the frame, and the sucking pump and the inflating tank are both provided with quick-release joints matched with the quick-release joint.
The ignition device is a resistance igniter, the resistance igniter is in a C shape or a U shape, both ends of the resistance igniter are connected with pantographs, and a power supply net rack matched with the pantographs is arranged on the rack.
The sintering furnace is characterized in that a discharging station is arranged on the frame, a dust cover wrapping the sintering furnace is arranged on the frame at the discharging station, an exhaust pipe is arranged at the top of the dust cover, and an exhaust fan is connected to the exhaust pipe.
The inner wall of the furnace body is in a frustum shape, a vertically arranged air cylinder is further arranged on the dust cover, and a push rod which can extend into the inner wall of the furnace body is arranged on a piston rod of the air cylinder.
An electric push rod for positioning the furnace body is arranged on the frame on one side of the air cylinder, and a positioning plate matched with the outer wall of the furnace body is connected to the electric push rod.
A slide plate which is obliquely arranged is arranged on the frame below the air cylinder.
The invention has the following effects:
(1) The upper end cover and the lower end cover on each sintering furnace can stabilize the sintering environment in each sintering furnace by arranging a plurality of sintering furnaces on the conveying mechanism, so that the consistency of products produced by the plurality of sintering furnaces is ensured, and the quality of sintered products is ensured;
(2) The ignition device is arranged on the upper end cover, so that the sintering furnace can work in a sealed environment, and the diffusion of burnt waste gas generated in the moving process of the sintering furnace can be prevented, and the environmental pollution caused by the diffusion of burnt waste gas can be avoided;
(3) By arranging the material dividing plate in the upper bin, a plurality of sintering materials can be placed in the sintering furnace, so that the variety of sintered products is increased;
(4) The pressure control device is arranged on the furnace body, so that the pressure in each sintering furnace can be adjusted to adapt to multi-condition sintering;
(5) Through set up the dust cover in the frame to set up cylinder and the electric putter of unloading in the dust cover, can be convenient unload the fritting furnace, simultaneously through the blast pipe on the dust cover, can take out the flue gas in the fritting furnace, avoid the flue gas to influence the industrial and mining of station department of unloading.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic view showing the internal structure of the sintering furnace according to the present invention.
Fig. 3 is a schematic structural view of a feeding device according to the present invention.
Fig. 4 is a schematic structural diagram of the ignition device of the present invention mated with a power grid.
Fig. 5 is a schematic view of the inner structure of the dust cap of the present invention.
Reference numerals: 1. a frame; 2. a conveying mechanism; 3. a sintering furnace; 31. a furnace body; 32. an upper end cap; 33. a lower end cap; 34. a support edge; 4. an ignition device; 41. a resistance igniter; 42. a pantograph; 43. a power supply rack; 5. a feeding device; 51. a feeding bin; 52. a material dividing plate; 53. a discharge pipe; 54. an electric telescopic arm; 6. a pressure control device; 61. a pressure-resistant tube; 62. an electromagnetic sealing valve; 63. quick-release connectors; 64. an air extracting pump; 65. an air charging tank; 66. a quick connector; 7. a dust cover; 71. an exhaust pipe; 72. an exhaust fan; 73. a cylinder; 74. a push rod; 75. an electric push rod; 76. a positioning plate; 77. and a material sliding plate.
Detailed Description
Examples
As shown in fig. 1 to 5, the plant ash sintering device provided in this embodiment includes a frame 1, a conveying mechanism 2 installed on the frame 1, a plurality of sintering furnaces 3 installed on the conveying mechanism 2, and a feeding device 5, a pressure control device 6, an ignition device 4 and a dust cover 7 sequentially arranged along the feeding direction of the conveying mechanism 2, the sintering furnaces 3 include a furnace body 31 vertically installed on the conveying mechanism 2, an upper end cover 32 hinged on the top end of the furnace body 31, and a lower end cover 33 hinged on the bottom end of the furnace body 31, high temperature resistant sealing rings matched with the upper end cover 32 and the lower end cover 33 are arranged on the end surfaces of the top end and the bottom end of the furnace body 31, the furnace body 31 is hollow, a supporting edge 34 hinged with the conveying mechanism 2 is machined on the outer wall of the furnace body 31, the bottom surface of the upper end cover 32 is provided with an ignition device 4, the ignition device 4 is a resistor igniter 41, two ends of the resistor igniter 41 pass through the upper end cover 32 and are connected with a pantograph 42, a net rack 43 matched with the net rack 42 is arranged on the frame 1, and electric energy is saved for the resistor igniter 41 to provide electric energy for the resistor igniter 3, so that electric wires can be prevented from being installed on the sintering furnace 3.
Be equipped with on the frame 1 with sintering furnace 3 complex loading attachment 5, loading attachment 5 includes feeding bin 51, installs the branch flitch 52 in feeding bin 51 and the row material pipe 53 of being connected with furnace body 31, divide flitch 52 to have two, through two branch flitch 52, can fill two different raw materials in feeding bin 51, such as heat-resisting bed charge and vegetation sediment, make feeding bin 51's use more convenient, and two divide flitch 52 all to articulate in feeding bin 51, all be equipped with on the bottom surface of every divide flitch 52 and drive branch flitch 52 pivoted electric telescopic arm 54, the row material pipe 53 is installed to feeding bin 51 bottom.
Be equipped with the accuse pressure equipment 6 of adjusting the internal pressure of furnace body 31 on the lateral wall of furnace body 31, accuse pressure equipment 6 include with the resistance to compression pipe 61 of furnace body 31 upper portion intercommunication and install the electromagnetic seal valve 62 on resistance to compression pipe 61, the one end that resistance to compression pipe 61 kept away from furnace body 31 is equipped with conical quick detach and connects 63, be equipped with on the frame 1 with quick detach and connect 63 complex aspiration pump 64 and inflator tank 65, aspiration pump 64 and inflator tank 65 all are equipped with quick detach and connect 63 matched with quick connect 66, connect 63 through setting up quick detach 66 and furnace body 31 on, can carry out the evacuation to furnace body 31 fast, improved the speed.
Be equipped with the station of unloading on the frame 1, be equipped with the dust cover 7 of parcel fritting furnace 3 on the frame 1 of station department of unloading, the dust cover 7 top is equipped with blast pipe 71, is connected with air exhauster 72 on the blast pipe 71, and the inner wall of furnace body 31 is the frustum form, still is equipped with the cylinder 73 of vertical setting on the dust cover 7, is equipped with the push rod 74 that can stretch into the inner wall of furnace body 31 on the piston rod of cylinder 73, be equipped with the electric putter 75 to furnace body 31 location on frame 1 of cylinder 73 one side, be connected with on the electric putter 75 with furnace body 31 outer wall complex locating plate 76, be equipped with the slide plate 77 that the slope set up on the frame 1 of cylinder 73 below.
The application method of the invention is as follows:
The lower end cover 33 of the furnace body 31 is closed, the sintering furnace 3 is controlled to move to the feeding device 5 through the conveying mechanism 2, the two distributing plates 52 of the feeding device 5 are sequentially provided with heat-resistant base materials and plant residues from bottom to top, then the heat-resistant base materials and the plant residues are sequentially placed into the sintering furnace 3 through the electric telescopic arms 54, the filling height of the heat-resistant base materials needs to exceed the hollow position of the furnace body 31 so as to reduce the temperature ablation of the sintering furnace 3 generated when the plant ash is sintered, the filling height of the plant ash needs to be matched with the ignition device 4 arranged on the upper end cover 32, then the worker covers the upper end cover 32, and moves the sintering furnace 3 to the position of the pressure control device 6 through the conveying mechanism 2, at the moment, the worker connects the quick connector 66 on the air pump 64 with the quick-release connector 63 on the furnace body 31 so as to pump air in the furnace body 31, and then according to the sintering requirements, if oxygen charging, nitrogen charging, vacuum or high pressure is required, air in the furnace body 31 is pumped out through the air pump 64 or the pressure in the furnace body 31 is increased, or oxygen or nitrogen is supplemented to the vacuumized furnace body 31 through the air charging tank 65, then the conveying mechanism 2 drives the sintering furnace 3 to move to the power supply net frame 43, the pantograph 42 contacts with the power supply net frame 43 to provide voltage for the resistance igniter 41, the resistance igniter 41 ignites the grass and wood residues on the upper part of the furnace body 31, the length of the power supply net frame 43 is enough for the resistance igniter 41 to successfully ignite, then the sintering furnace 3 sinters the grass and wood residues on the conveying mechanism 2, the length of the conveying mechanism 2 is enough for the grass and wood residues to be completely sintered into plant ash, the grass and wood residues enter the dust cover 7 after being sintered, at the moment, a worker opens the lower end cover 33 and the upper end cover 32, and then the electric push rod 75 drives the positioning plate 76 to limit the sintering furnace 3, then the push rod 74 of the control cylinder 73 pushes out the sintered plant ash and falls on the slide plate 77, and finally the conveying mechanism 2 drives the sintering furnace 3 to move to the feeding device 5 for the next round of sintering processing.
The foregoing is merely a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification and substitution based on the technical scheme and the inventive concept provided by the present invention should be covered in the scope of the present invention.
Claims (6)
1. The utility model provides a plant ash sintering device which characterized in that: including the frame, install transport mechanism in the frame and install a plurality of fritting furnaces on transport mechanism, the fritting furnace includes vertical furnace body that installs on transport mechanism, articulates the upper end cover on furnace body top and articulates the lower extreme cover in the furnace body bottom, be equipped with on the terminal surface of furnace body top and bottom with upper end cover and lower extreme cover complex high temperature resistant sealing washer, the furnace body cavity, processing has on the outer wall of furnace body with transport mechanism articulated support edge, the bottom surface of upper end cover is equipped with ignition, be equipped with in the frame with fritting furnace complex loading attachment, loading attachment includes the feeding storehouse, installs the feed plate in the feeding storehouse and the row material pipe of being connected with the furnace body, the feed plate has two, and two feed plates all articulate in the feeding storehouse, all be equipped with on the bottom surface of every feed plate and drive feed plate pivoted electric telescopic arm, be equipped with the accuse pressure equipment of adjusting the pressure in the furnace body on the lateral wall of furnace body, accuse pressure equipment includes the stand with the stand and installs on the stand and installs the stand and the electromagnetic valve on the stand and installs on the stand and installs the stand and the quick-off, quick-off and quick-release coupling is equipped with the air pump and the quick-release coupling.
2. Plant ash sintering device according to claim 1, characterized in that: the ignition device is a resistance igniter, the resistance igniter is in a C shape or a U shape, both ends of the resistance igniter are connected with pantographs, and a power supply net rack matched with the pantographs is arranged on the rack.
3. Plant ash sintering device according to claim 1, characterized in that: the sintering furnace is characterized in that a discharging station is arranged on the frame, a dust cover wrapping the sintering furnace is arranged on the frame at the discharging station, an exhaust pipe is arranged at the top of the dust cover, and an exhaust fan is connected to the exhaust pipe.
4. A plant ash sintering plant according to claim 3, characterised in that: the inner wall of the furnace body is in a frustum shape, a vertically arranged air cylinder is further arranged on the dust cover, and a push rod which can extend into the inner wall of the furnace body is arranged on a piston rod of the air cylinder.
5. Plant ash sintering plant according to claim 4, characterized in that: an electric push rod for positioning the furnace body is arranged on the frame on one side of the air cylinder, and a positioning plate matched with the outer wall of the furnace body is connected to the electric push rod.
6. Plant ash sintering device according to claim 5, characterized in that: a slide plate which is obliquely arranged is arranged on the frame below the air cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911315321.XA CN110887375B (en) | 2019-12-17 | 2019-12-17 | Plant ash sintering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911315321.XA CN110887375B (en) | 2019-12-17 | 2019-12-17 | Plant ash sintering device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110887375A CN110887375A (en) | 2020-03-17 |
| CN110887375B true CN110887375B (en) | 2024-08-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911315321.XA Active CN110887375B (en) | 2019-12-17 | 2019-12-17 | Plant ash sintering device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110887375B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111778039A (en) * | 2020-08-12 | 2020-10-16 | 浙江省地质调查院 | Preparation of calcined biochar type conditioner and application method of conditioner |
| CN112179139B (en) * | 2020-09-29 | 2023-10-24 | 镇江瑞昊工程塑料有限公司 | Batch feeding device for baking oven sintering furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201926286U (en) * | 2010-11-24 | 2011-08-10 | 北京建邦伟业机械制造有限公司 | Fly-ash porcelain-granule sintering furnace |
| CN211400751U (en) * | 2019-12-17 | 2020-09-01 | 四川省科源工程技术测试中心 | Plant ash sintering device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2674295Y (en) * | 2003-11-21 | 2005-01-26 | 北京七星华创电子股份有限公司 | High-temp reaction fritting furnace |
| KR100826269B1 (en) * | 2006-06-13 | 2008-04-29 | 삼성전기주식회사 | complex sintering furnace and up and down motion apparatus |
| CN102062528A (en) * | 2010-11-24 | 2011-05-18 | 北京建邦伟业机械制造有限公司 | Fly ash product sintering furnace and method and formula thereof |
-
2019
- 2019-12-17 CN CN201911315321.XA patent/CN110887375B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201926286U (en) * | 2010-11-24 | 2011-08-10 | 北京建邦伟业机械制造有限公司 | Fly-ash porcelain-granule sintering furnace |
| CN211400751U (en) * | 2019-12-17 | 2020-09-01 | 四川省科源工程技术测试中心 | Plant ash sintering device |
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| Publication number | Publication date |
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| CN110887375A (en) | 2020-03-17 |
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Country or region after: China Address after: Building 1, No. 919, Section 1, Kehui Road, Wenjiang District, Chengdu City, Sichuan Province, 611130 Applicant after: Sichuan Keyuan Engineering Technology Test Center Co.,Ltd. Address before: Unit 1, building 5, No.229, Jingye Road, Qingyang District, Chengdu City, Sichuan Province 610073 Applicant before: KEYUAN ENGINEERING TECHNICAL TEST CENTER OF SICHUAN PROVINCE Country or region before: China |
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