CN204198815U - A kind of degold device for reclaiming the gold in waste and old circuit board - Google Patents
A kind of degold device for reclaiming the gold in waste and old circuit board Download PDFInfo
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- CN204198815U CN204198815U CN201420514534.1U CN201420514534U CN204198815U CN 204198815 U CN204198815 U CN 204198815U CN 201420514534 U CN201420514534 U CN 201420514534U CN 204198815 U CN204198815 U CN 204198815U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The utility model discloses a kind of degold device for reclaiming the gold in waste and old circuit board, comprise support and rack-mount degold reactor and filtrate treatment trough, described degold reactor bottom establishes liquid outlet, this liquid outlet connects a goldleaf strainer, described goldleaf filter bits is in filtrate treatment trough, the reacted solution of degold and solids enter in goldleaf strainer filters, and waste liquid outlet is established in the bottom of described filtrate treatment trough, establishes discharge port bottom it.This degold apparatus structure is simple, and raw materials is common and cheap, easy to operate, pollution-free, suitability for scale production.
Description
Technical field
The utility model relates to a kind of circuit card recycling and processing device, particularly relates to a kind of degold device for reclaiming the gold in waste and old circuit board.
Background technology
Printed circuit board (PCB) is one of vitals of electronic industry, mainly provides support and ligation to electronic devices and components, from computer, televisor, mobile phone to electronic toy etc., has circuit card to exist in nearly all electronic product.Along with the development that electron trade is so swift and violent, electron wastes just with annual 18% speed increment, become fastest-rising rubbish in the world.
In waste and old circuit board, the content of gold is far away higher than the content of gold in raw ore, data show, the 1t circuit card that gives up can extract gold from about 80g, and gold recovering is more much lower than the cost of Extracting Gold from raw ore from waste and old circuit board, also can save mineral raw material, reduce the environmental pollution in smelting process.Therefore, from waste and old circuit board, gold recovering can bring certain economy, society and environmental benefit, has the important meaning of Sustainable development.
The technique of existing circuit card Footwall drift mainly contains the method that mechanical treatment, pyrometallurgy, hydrometallurgy or several technology combine.Wherein, mechanical treatment only can realize metal and nonmetallic substantial separation, pyrometallurgy directly waste and old circuit board is put into smelting furnace to burn, this process can produce the poison gas containing dioxin, furans and polychlorinated biphenyl material, serious pollution is caused to environment, and the rate of recovery of valuable metal is low, be the superseded technique that country prohibites.The main thinking of hydrometallurgy is pulverized by circuit card, separating metal and nonmetal, with oxygenant, metal oxygen changed into ion and enter solution, then take certain way to solution, by various metal separation out.
At present, because the mechanism difference of hydrometallurgical recovery gold causes the equipment of corresponding gold recovering also to some extent need not.
Chinese utility model patent ZL201320148880.8 provides a kind of golden retrieving arrangement for gold coated article, it is the recovery system of the gold of the principle of the molten gold of application gold coated article wet method, gold dissolving liquid body is housed in desolvation groove, the perforated cylinder be arranged in desolvation groove is equipped with gold coated article, in the process that cylinder rotates, complete the molten gold of gold coated article, then reclaiming metals gold is carried out to molten gold solution.Chinese utility model patent ZL201220427094.7 provides a kind of gold recovering device, adopts multi-stage absorption to reclaim metallic gold to the outer row's raffinate containing gold.Chinese utility model patent ZL01201749.3 provides device for fluidized eletrolytic recovery of gold, and this device, to the rinse water after gold-plated and the lower waste liquid of other gold content, reclaims gold wherein in the mode of electrolysis.
Summary of the invention
It is simple that the purpose of this utility model aims to provide a kind of structure, the degold device for reclaiming the gold in waste and old circuit board of low cost of manufacture.
The purpose of this utility model is achieved through the following technical solutions: a kind of degold device for reclaiming the gold in waste and old circuit board, comprise support and rack-mount degold reactor and filtrate treatment trough, described degold reactor bottom establishes liquid outlet, this liquid outlet connects a goldleaf strainer, described goldleaf filter bits is in filtrate treatment trough, the reacted solution of degold and solids enter in goldleaf strainer filters, waste liquid outlet is established in the bottom of described filtrate treatment trough, establishes discharge port bottom it.
Described degold reactor is a cylindrical shell, rotating shaft is established at its two ends, feed inlet and outlet to be opened/closed is established at top, liquid outlet is established in bottom, liquid outlet place establishes valve, and liquid outlet and goldleaf strainer removably connect, and described degold reactor is by the rack-mount bearing of the rotating shaft at two ends, rotating shaft is connected with the clutch end of drive-motor, drives degold reactor to rotate by drive-motor.When carrying out degold reaction, close feed inlet and outlet and the liquid outlet of degold reactor, drive-motor drives degold reactor to rotate, until reaction terminates, then the liquid outlet of degold reactor is gone to bottom, connect the feed end of liquid outlet and goldleaf strainer, open valve, degold solution, goldleaf and various gadget flow in goldleaf strainer and filter, during discharging, unload goldleaf cartridge filter, the discharge port of degold reactor is rotated and carries out discharging to bottom.
Described goldleaf strainer comprises pipeline and cartridge filter, one end mouth of pipe of pipeline is connected with the opening for feed at the top of cartridge filter, the mouth of pipe of the other end is then as the fluid inlet being used for being connected with degold reactor liquid outlet, described cartridge filter comprises gadget recovery cylinder and goldleaf recovery cylinder, , gadget recovery cylinder is positioned at the top of goldleaf recovery cylinder, the opening at goldleaf recovery cylinder top and the bottom of gadget recovery cylinder removably connect, the base plate of described gadget recovery cylinder is covered with by solution and goldleaf but can stops the filter opening that gadget passes through, the bottom of described goldleaf recovery cylinder is only by the filter screen of solution, the material flowed out from degold reactor is introduced into gadget recovery cylinder, gadget is stayed in gadget recovery cylinder, solution and goldleaf flow in goldleaf recovery cylinder through filter opening, goldleaf is stopped by filter screen to be stayed in goldleaf recovery cylinder, solution and the solids less than goldleaf particle diameter are entered in filtrate treatment trough by filter screen carries out standing sedimentation process.
The filter screen that described filter screen can be nylon wire or be made up of anticorrosive wear-resistant material.The order number of filter screen requires to stop goldleaf to flow out the outflow not affecting again solution.In the utility model, the order number of described filter screen is 500 orders.
The filter opening of described gadget recovery cylinder base plate is for being obliquely installed, and its gradient is 30 ~ 60 °, aperture 1mm ~ 1.8mm.
The bottom of described filtrate treatment trough is at the bottom of V-arrangement, its lower-most point place establishes discharge port, solids falls at the bottom of this V-arrangement, be convenient to discharge, the waste liquid outlet of described filtrate treatment trough is located on the cell wall close to upper limb at the bottom of V-arrangement, the outer wall on filtrate treatment trough top establishes Support joint, and Support joint is fixed on support; The sidewall on described filtrate treatment trough top establishes reagent inlet, for adding the reagent such as flocculation agent.
The utility model can do following improvement: set up whipping appts, for stirring the material in filtrate treatment trough, filtrate and flocculation agent fully can be reacted, and stir meeting speeding-up ion movement rate, and then speed of reaction can be accelerated, thus precipitation can be formed evenly and rapidly.
As an embodiment of the present utility model, described whipping appts is connected and composed successively by oxygen increasing pump, inlet pipe and gas distributor, wherein, described gas distributor to be placed in filtrate treatment trough and close to top at the bottom of V-arrangement, one end of described inlet pipe to be stretched in filtrate treatment trough and is connected with the inlet mouth of gas distributor, oxygen increasing pump is then positioned at outside filtrate treatment trough, toward inlet pipe and gas distributor delivering gas.
Described gas distributor comprises at least one gas distribution pipe, and wherein one end of every root gas distribution pipe is closed, and the other end is communicated with the outlet side of described inlet pipe, and the body of gas distribution pipe is provided with multiple qi-emitting hole, and described qi-emitting hole aperture is 1.5 ~ 2.5mm.
The utility model also can do following further improvement: set up degold solution return pipeline, this return line comprises acid proof pump and liquid-inlet pipe, the liquid feeding end of described acid proof pump is communicated with filtrate treatment trough lower liquid phase space, its outlet end then connects liquid-inlet pipe, the feed inlet and outlet of the outlet end of liquid-inlet pipe from degold reactor is put into, starting acid proof pump is recycled in degold reactor by the degold solution in filtrate treatment trough, for carrying out degold process next time, with recycle degold solution.
The utility model also comprises waste collection groove, is connected with the waste liquid outlet of filtrate treatment trough bottom.
The utility model also comprises precipitation receiving tank, is connected with the discharge port of the bottom of described filtrate treatment trough.
The utility model also comprises garbage collection groove, and described garbage collection groove, when the discharging of degold reactor, is placed on the below of degold reactor feed inlet and outlet.
compared with prior art, the utility model has following beneficial effect:
(1) what the utility model provided is simple for the degold apparatus structure reclaiming the gold in waste and old circuit board, and raw materials is common and cheap, easy to operate, pollution-free, suitability for scale production.
(2) goldleaf strainer of the present utility model makes degold solution, goldleaf and various gadget are well separated.
(3) the utility model arranges whipping appts, and filtrate and flocculation agent can fully be reacted, and stirs meeting speeding-up ion movement rate, and then can accelerate speed of reaction, thus can form precipitation evenly and rapidly.
(4) the utility model arranges degold solution return pipeline, is recycled in degold reactor by the degold solution in filtrate treatment trough, for carrying out degold process next time, with recycle degold solution.
Accompanying drawing explanation
Fig. 1 is the degold device degold device schematic diagram for reclaiming the gold in waste and old circuit board of the utility model embodiment.
Fig. 2 is degold reactor schematic diagram of the present utility model.
Fig. 3 is filtrate treatment trough device schematic diagram of the present utility model.
Fig. 4 is goldleaf filtering tube device schematic diagram of the present utility model.
Fig. 5 is the vertical view of the gadget recovery cylinder of goldleaf cartridge filter of the present utility model.
Fig. 6 is the vertical view of the goldleaf recovery cylinder 222 of goldleaf cartridge filter of the present utility model.
Embodiment
Shown in Fig. 1 to Fig. 4 is an embodiment of the present utility model for reclaiming the degold device of the gold in waste and old circuit board, comprise support 9, degold reactor 1, goldleaf strainer 2 and filtrate treatment trough 3, degold reactor 1 and filtrate treatment trough 3 are arranged on support 9, and degold reactor 1 is positioned at the top of filtrate treatment trough 3.Degold reactor 1 is a cylindrical shell 11, and rotating shaft 12 is established at its two ends, and feed inlet and outlet 13 to be opened/closed is established at top, and liquid outlet 14 is established in bottom, and liquid outlet 14 place establishes valve, and opening for feed and the liquid outlet 14 of goldleaf strainer 2 removably connect, and usually adopts and is threaded.Degold reactor 1 is arranged on the bearing of support 9 by the rotating shaft 12 at two ends, and rotating shaft 12 is connected with the variator 15 of the clutch end of drive-motor 16.During discharging, unload goldleaf strainer 2, the feed inlet and outlet 13 of degold reactor 1 is rotated and carries out discharging down.
Goldleaf strainer 2 comprises pipeline 20 and cartridge filter 22 as shown in Figure 4, and pipeline 20 one end mouth of pipe is connected with the opening for feed 223 at the top of cartridge filter 22, and the other end mouth of pipe then removably connects with the liquid outlet 14 of degold reactor 1, usually adopts and is threaded.Cartridge filter 22 comprises gadget recovery cylinder 221 and goldleaf recovery cylinder 222, and the opening of goldleaf recovery cylinder 222 is connected by flange or screw with the bottom of gadget recovery cylinder 221.As shown in Figure 5, the base plate 224 of gadget recovery cylinder 221 is covered with by solution and goldleaf but the filter opening 225 that gadget can be stoped to pass through, and filter opening 225 is for being obliquely installed, and its gradient is 30 ~ 60 °, aperture 1mm ~ 1.8mm.As shown in Figure 6, the bottom of goldleaf recovery cylinder 222 is filter screen 226, and filter screen 226 is the nylon wire of high order number.The order number of filter screen 226 requires to stop goldleaf to flow out the outflow not affecting again solution.Particularly, the order number of filter screen 226 is 500 orders.After degold reaction terminates, the liquid outlet 14 of degold reactor 1 is gone to bottom, and connects the fluid inlet of the pipeline 20 of goldleaf strainer 2, now goldleaf recovery cylinder 222 hangs in filtrate treatment trough 3.Open valve, degold solution, goldleaf and various gadget flow in goldleaf strainer 2 and filter, due to the stop of base plate 224, gadget is stayed in gadget recovery cylinder 221, solution and goldleaf enter in goldleaf recovery cylinder 222 through filter opening 225, goldleaf is stopped by filter screen 226 to be stayed in goldleaf recovery cylinder 222, and solution and the solids less than goldleaf particle diameter are entered in filtrate treatment trough 3 by filter screen 226 carries out standing sedimentation.
The bottom of filtrate treatment trough 3 is at the bottom of V-arrangement, and its lower-most point place establishes discharge port 34, and solids falls at the bottom of V-arrangement, is convenient to discharge.The waste liquid outlet 35 of filtrate treatment trough 3 is located on the cell wall close to upper limb at the bottom of V-arrangement, the lower-most point of waste liquid outlet 34 and the upper limb at the bottom of V-arrangement tangent, filtrate treatment trough 3 external wall of upper portion establishes Support joint 32, and Support joint 32 is fixing with on support 9.Filtrate treatment trough 3 side wall upper part is provided with reagent inlet 31, for adding the reagent such as flocculation agent in groove.Waste liquid outlet 35 connects waste collection groove 4.
The present embodiment also comprises whipping appts, for stirring the material in filtrate treatment trough 3, this whipping appts is connected and composed successively by oxygen increasing pump 8, inlet pipe 81 and gas distributor 82, wherein, gas distributor 82 to be placed in filtrate treatment trough 3 and close to top at the bottom of V-arrangement, and the outlet side of inlet pipe 81 to be stretched in filtrate treatment trough 3 and is connected with the inlet mouth of gas distributor 82.Gas distributor 82 is the gas distribution pipe of arranged transversely, and wherein one end of gas distribution pipe is closed, and the other end is communicated with the outlet side of inlet pipe 81, the body of gas distribution pipe on that side tube wall of bottom land, be evenly distributed with aperture down, aperture be the qi-emitting hole of 2mm.Oxygen increasing pump 8 passes into gas by inlet pipe 81 in gas distributor 82, and gas enters in the liquid in filtrate treatment trough 3 by gas distributor 82 again, due to the disturbance of gas, stirs liquid in groove, to be evenly rapidly formed precipitation.
The present embodiment also comprises degold solution return pipeline, and it comprises acid proof pump 7 and liquid-inlet pipe 71.The liquid feeding end of acid proof pump 7 is communicated with filtrate treatment trough 3 lower liquid phase space, namely the cell wall of filtrate treatment trough 3 close to upper limb at the bottom of V-arrangement establishes refluxing opening 33, and the liquid feeding end of acid proof pump 7 is connected with this refluxing opening 33.The outlet end of acid proof pump 7 then connects liquid-inlet pipe 71, the feed inlet and outlet 11 of the outlet end of liquid-inlet pipe 71 from degold reactor 1 is put into, starting acid proof pump 7 is recycled in degold reactor 1 by the degold solution in filtrate treatment trough 3, for carrying out degold process next time, with recycle degold solution.
The present embodiment also comprises garbage collection groove 6, and this garbage collection groove 6, when 1 discharging of degold reactor, is placed on the below of degold reactor 1 feed inlet and outlet, for collecting the material drawn off in degold reactor 1.
The present embodiment also comprises precipitation receiving tank 5, and the opening for feed of this precipitation receiving tank 5 is connected with the discharge port 34 of filtrate collecting tank 3, for collecting the throw out of discharge in filtrate collecting tank 3.
When carrying out degold process, waste and old circuit board and degold solution add degold reactor 1 from the feed inlet and outlet 13 of degold reactor 1, and close feed inlet and outlet 13, drive-motor 15 drives the degold reactor 1 of degold reactor 1 to rotate, until reaction terminates.Then, the liquid outlet 14 of degold reactor 1 is gone to bottom, connect the pipeline 21 of liquid outlet 14 and goldleaf strainer 2, open valve, degold solution, goldleaf and various gadget flow in goldleaf strainer 2 and filter.Meanwhile, start oxygen increasing pump 8 and pass into gas toward the liquid in filtrate treatment trough 3, gas enters in liquid through gas distributor 82 distribution, due to the disturbance of gas, stirs liquid, is evenly rapidly formed precipitation.During discharging, unload goldleaf strainer 2, the feed inlet and outlet 13 of degold reactor 1 is rotated to bottom, garbage collection groove 6 is placed in the below of feed inlet and outlet 13, then carry out discharging.Degold solution can recycle before not losing efficacy, therefore can start acid proof pump 7 is recycled in degold reactor 1 by the degold solution in filtrate treatment trough 3, for degold reaction next time, until degold solution ineffective, then open waste liquid outlet 35 waste liquid is expelled in waste collection groove 4.
The utility model can be summarized with other the specific form without prejudice to spirit of the present utility model or principal character.Above-mentioned embodiment of the present utility model all can only be thought explanation of the present utility model instead of restriction, therefore every above embodiment is done according to substantial technological of the present utility model any trickle amendment, equivalent variations and modification, all belong in the scope of technical solutions of the utility model.
Claims (10)
1. one kind for reclaiming the degold device of the gold in waste and old circuit board, it is characterized in that, comprise support and rack-mount degold reactor and filtrate treatment trough, described degold reactor bottom establishes liquid outlet, this liquid outlet connects a goldleaf strainer, and described goldleaf filter bits is in filtrate treatment trough, and the reacted solution of degold and solids enter in goldleaf strainer filters, waste liquid outlet is established in the bottom of described filtrate treatment trough, establishes discharge port bottom it.
2. according to claim 1 for reclaiming the degold device of the gold in waste and old circuit board, it is characterized in that, described degold reactor is a cylindrical shell, and rotating shaft is established at its two ends, and feed inlet and outlet to be opened/closed is established at top, liquid outlet is established in bottom, liquid outlet place establishes valve, and liquid outlet and goldleaf strainer removably connect, and described degold reactor is by the rack-mount bearing of the rotating shaft at two ends, rotating shaft is connected with the clutch end of drive-motor, drives degold reactor to rotate by drive-motor.
3. according to claim 1 for reclaiming the degold device of the gold in waste and old circuit board, it is characterized in that, described goldleaf strainer comprises pipeline and cartridge filter, one end mouth of pipe of pipeline is connected with the opening for feed at the top of cartridge filter, the mouth of pipe of the other end is then as the fluid inlet being used for being connected with degold reactor liquid outlet, described cartridge filter comprises gadget recovery cylinder and goldleaf recovery cylinder, gadget recovery cylinder is positioned at the top of goldleaf recovery cylinder, the opening at goldleaf recovery cylinder top and the bottom of gadget recovery cylinder removably connect, the base plate of described gadget recovery cylinder is covered with by solution and goldleaf but can stops the filter opening that gadget passes through, the bottom of described goldleaf recovery cylinder is only by the filter screen of solution, the material flowed out from degold reactor is introduced into gadget recovery cylinder, gadget is stayed in gadget recovery cylinder, solution and goldleaf flow in goldleaf recovery cylinder through filter opening, goldleaf is stopped by filter screen to be stayed in goldleaf recovery cylinder, solution and the solids less than goldleaf particle diameter are entered in filtrate treatment trough by filter screen carries out standing sedimentation process.
4. according to claim 3 for reclaiming the degold device of the gold in waste and old circuit board, it is characterized in that, the filter screen that described filter screen is nylon wire or is made up of anticorrosive wear-resistant material; The filter opening of described gadget recovery cylinder base plate is for being obliquely installed, and its gradient is 30 ~ 60 °, aperture 1mm ~ 1.8mm.
5. according to claim 1 for reclaiming the degold device of the gold in waste and old circuit board, it is characterized in that, the bottom of described filtrate treatment trough is at the bottom of V-arrangement, its lower-most point place establishes discharge port, solids falls at the bottom of this V-arrangement, and be convenient to discharge, the waste liquid outlet of described filtrate treatment trough is located on the cell wall close to upper limb at the bottom of V-arrangement, the outer wall on filtrate treatment trough top establishes Support joint, and Support joint is fixed on support; The sidewall on described filtrate treatment trough top establishes reagent inlet, for adding the reagent such as flocculation agent.
6. according to claim 1 for reclaiming the degold device of the gold in waste and old circuit board, it is characterized in that, also comprise whipping appts, for stirring the material in filtrate treatment trough.
7. according to claim 6 for reclaiming the degold device of the gold in waste and old circuit board, it is characterized in that, described whipping appts is connected and composed successively by oxygen increasing pump, inlet pipe and gas distributor, wherein, described gas distributor to be placed in filtrate treatment trough and close to top at the bottom of V-arrangement, one end of described inlet pipe to be stretched in filtrate treatment trough and is connected with the inlet mouth of gas distributor, and oxygen increasing pump is then positioned at outside filtrate treatment trough, past inlet pipe and gas distributor delivering gas.
8. according to claim 7 for reclaiming the degold device of the gold in waste and old circuit board, it is characterized in that, described gas distributor comprises at least one gas distribution pipe, wherein one end of every root gas distribution pipe is closed, the other end is communicated with the outlet side of described inlet pipe, the body of gas distribution pipe is provided with multiple qi-emitting hole, and described qi-emitting hole aperture is 1.5 ~ 2.5mm.
9. according to claim 1 for reclaiming the degold device of the gold in waste and old circuit board, it is characterized in that, also comprise degold solution return pipeline, this return line comprises acid proof pump and liquid-inlet pipe, the liquid feeding end of described acid proof pump is communicated with filtrate treatment trough lower liquid phase space, its outlet end then connects liquid-inlet pipe, the feed inlet and outlet of the outlet end of liquid-inlet pipe from degold reactor is put into, starting acid proof pump is recycled in degold reactor by the degold solution in filtrate treatment trough, for carrying out degold process next time, with recycle degold solution.
10. according to claim 1 for reclaiming the degold device of the gold in waste and old circuit board, it is characterized in that, also comprise waste collection groove, precipitation receiving tank and garbage collection groove, described waste collection groove is connected with the waste liquid outlet of filtrate treatment trough bottom; Described precipitation receiving tank is connected with the discharge port of the bottom of described filtrate treatment trough; Described garbage collection groove, when the discharging of degold reactor, is placed on the below of degold reactor feed inlet and outlet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420514534.1U CN204198815U (en) | 2014-09-09 | 2014-09-09 | A kind of degold device for reclaiming the gold in waste and old circuit board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420514534.1U CN204198815U (en) | 2014-09-09 | 2014-09-09 | A kind of degold device for reclaiming the gold in waste and old circuit board |
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| CN204198815U true CN204198815U (en) | 2015-03-11 |
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| CN201420514534.1U Active CN204198815U (en) | 2014-09-09 | 2014-09-09 | A kind of degold device for reclaiming the gold in waste and old circuit board |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104263940A (en) * | 2014-09-09 | 2015-01-07 | 中国电器科学研究院有限公司 | Degolding device for recycling gold in waste circuit boards |
-
2014
- 2014-09-09 CN CN201420514534.1U patent/CN204198815U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104263940A (en) * | 2014-09-09 | 2015-01-07 | 中国电器科学研究院有限公司 | Degolding device for recycling gold in waste circuit boards |
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Address after: 510302 No. 204 Xingang West Road, Haizhu District, Guangzhou City, Guangdong Province Patentee after: China Electrical Appliance Research Institute Co., Ltd. Address before: 510300 No. 204 West Xingang Road, Guangdong, Guangzhou Patentee before: China National Electric Apparatus Research Institute Co., Ltd. |