CN111509495A - Overheated self-outage formula row inserts - Google Patents
Overheated self-outage formula row inserts Download PDFInfo
- Publication number
- CN111509495A CN111509495A CN202010298338.5A CN202010298338A CN111509495A CN 111509495 A CN111509495 A CN 111509495A CN 202010298338 A CN202010298338 A CN 202010298338A CN 111509495 A CN111509495 A CN 111509495A
- Authority
- CN
- China
- Prior art keywords
- extension socket
- power
- self
- insulating plate
- insulation board
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
- H01R13/629—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances
- H01R13/633—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances for disengagement only
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/465—Identification means, e.g. labels, tags, markings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/502—Bases; Cases composed of different pieces
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/70—Structural association with built-in electrical component with built-in switch
- H01R13/713—Structural association with built-in electrical component with built-in switch the switch being a safety switch
- H01R13/7137—Structural association with built-in electrical component with built-in switch the switch being a safety switch with thermal interrupter
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
Abstract
The invention discloses an overheated self-power-off extension socket which comprises an extension socket shell, wherein two straight plates are symmetrically arranged on the inner bottom wall of the extension socket shell, an insulating plate is arranged on the two straight plates in a sealing and sliding mode, a telescopic sleeve and two conductive grooves are formed in the insulating plate, electric connecting pieces are symmetrically welded on two sides of the insulating plate and are electrically connected with the corresponding conductive grooves, a round hole and two slots are formed in the top wall of the extension socket shell, the position of the round hole corresponds to that of the telescopic sleeve, the position of each slot corresponds to that of the corresponding conductive groove, a communication opening is formed in the middle of the insulating plate, and the position of the communication opening corresponds to that of the telescopic sleeve. The invention can not only reduce the working temperature of the extension socket when in use, but also automatically eject the plug when the circuit is overloaded or short-circuited, thereby achieving the purpose of overheating and self-power-off and avoiding fire caused by overhigh temperature of the extension socket.
Description
Technical Field
The invention relates to the technical field of power connectors, in particular to an overheated self-power-off extension socket.
Background
Along with the improvement of science and technology and the improvement of industrial level, not only rely on the socket of fixing on the wall to realize connecting between consumer and the circuit, can also realize the power supply to consumer through row's socket, the appearance of row's socket has made things convenient for people's life very much.
The existing extension socket reduces resistance by increasing the cross-sectional area of a wire copper core so as to reduce the generation of a heating phenomenon, but when a short circuit or an overload phenomenon occurs in an extension socket circuit, the heat productivity of the circuit is rapidly increased, the internal temperature of the extension socket can be rapidly increased, cables and various electronic components can be easily ignited, so that a fire disaster occurs, although some extension socket shells use flame retardant materials, the continuous high temperature still can cause irreversible damage to plugs and partial components at the connection part, and even can influence the normal use of electric equipment, so that an overheating self-power-off extension socket is provided.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, when the internal temperature of a power strip rapidly rises, the power strip cannot be automatically cut off, electronic components cannot be irreversibly damaged after the temperature reaches a certain value, and electric equipment cannot be normally used.
In order to achieve the purpose, the invention adopts the following technical scheme:
an overheated self-power-off extension socket comprises an extension socket shell, wherein two straight plates are symmetrically arranged on the inner bottom wall of the extension socket shell, an insulating plate is arranged on the two straight plates in a sealing and sliding mode, a telescopic sleeve and two conductive grooves are formed in the insulating plate, electric connecting pieces are symmetrically welded on two sides of the insulating plate and are electrically connected with the corresponding conductive grooves, a round hole and two slots are formed in the top wall of the extension socket shell, the position of the round hole corresponds to that of the telescopic sleeve, the position of each slot corresponds to that of the corresponding conductive groove, a communication port is formed in the middle of the insulating plate, the position of the communication port corresponds to that of the telescopic sleeve, and two conductive rods are further arranged on the inner side wall of the extension socket shell;
the utility model discloses a sealed slide-type multi-plug socket, including insulation board, row's shell, guide way, sealed slide and link to each other with the guide way, rotate on the diapire of insulation board and be provided with two bafflers, and be connected with reset spring between two bafflers, be equipped with the guide way on arranging the inner diapire of inserting the casing, and the bottom of every baffler all links to each other with the guide way is sealed to slide, guide way and two bafflers all are.
Preferably, an evaporation liquid is filled between each barrier plate and the corresponding straight plate, and a non-compressive fluid is filled between the two barrier plates.
Preferably, the included angle between the planes of the two baffle plates is an acute angle, and the range of the acute angle is 15-30 degrees.
Preferably, the bottom end of each barrier plate is provided with a round angle.
Preferably, two placing grooves are symmetrically formed in the extension socket shell, the positions of the two placing grooves correspond to the positions of the corresponding conducting rods respectively, and a transparent plate is hermetically mounted in each placing groove.
The invention has the beneficial effects that:
1. through setting up devices such as baffler board, straight board, insulation board, telescope tube, when circuit overload or short circuit, the heat accessible insulation board that circuit joint department produced transmits in to the evaporant with straight board, and the evaporation of evaporant can promote the baffler and remove to indirect drive telescope tube extension, then ejecting with the plug, the electric connection piece also no longer contacts with the conducting rod simultaneously, borrows this automatic power off who realizes arranging the plug.
2. The non-compressible fluid is extremely difficult to compress, so as long as the evaporation amount of the evaporation liquid reaches a certain value, the telescopic sleeve can overcome certain resistance to change into an extension state, so that the plug is forced to move upwards, and the purpose of breaking and fire prevention is achieved.
3. The bottom of baffler is equipped with the fillet, can make baffler bottom more mellow and full through setting up the fillet, guarantees that it can be in the same direction as smooth removal on the guide way, and simultaneously, the fillet design can make the leakproofness between baffler and the guide way better, avoids two kinds of different liquid to take place to mix.
4. After the plug is inserted, the contact area between the straight plate and the evaporating liquid is increased by the movement of the blocking plate, and the evaporating liquid has larger specific heat capacity, so that the plug can absorb partial heat and reduce the working temperature of the extension socket.
5. This device accessible standing groove in the temperature sensing color change material judge arrange insert and internal circuit's operating temperature whether be higher than safe temperature, if the colour of temperature sensing color change material changes, people can in time discover, then extract the plug, seek the reason to components and parts in the circuit receive irreversible harm.
In conclusion, the invention can reduce the working temperature of the extension socket when in use, and can automatically eject the plug when the circuit is overloaded or short-circuited, thereby achieving the purpose of overheating and self-power-off and avoiding fire caused by overhigh temperature of the extension socket.
Drawings
Fig. 1 is a schematic structural diagram of an overheating self-power-off power strip embodiment 1 according to the present invention;
fig. 2 is a schematic structural diagram of an overheat self-powered-off extension socket in accordance with embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of an overheating self-power-off extension socket of the present invention according to embodiment 1, wherein the device is overheated;
fig. 4 is a schematic structural diagram of an overheating self-power-off power strip embodiment 2 according to the present invention;
fig. 5 is an enlarged view of a portion a in fig. 4.
In the figure: the device comprises a slot 1, a telescopic sleeve 2, a round hole 3, a conductive groove 4, an insulating plate 5, a communication port 6, a power connection piece 7, a conductive rod 8, a return spring 9, a barrier plate 10, a straight plate 11, a guide groove 12, a row-inserting shell 13, a transparent plate 14 and a placing groove 15.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
Referring to fig. 1-3, an overheated self-powered-off extension socket comprises an extension socket shell 13, wherein two straight plates 11 are symmetrically arranged on the inner bottom wall of the extension socket shell 13, an insulating plate 5 is jointly and slidably mounted on the two straight plates 11 in a sealing manner, an expansion sleeve 2 and two conductive grooves 4 are arranged on the insulating plate 5, electric connecting pieces 7 are symmetrically welded on two sides of the insulating plate 5, each electric connecting piece 7 is electrically connected with the corresponding conductive groove 4, a round hole 3 and two slots 1 are formed in the top wall of the extension socket shell 13, the round hole 3 corresponds to the expansion sleeve 2, each slot 1 corresponds to the corresponding conductive groove 4, a communication port 6 is formed in the middle of the insulating plate 5, the communication port 6 corresponds to the expansion sleeve 2, and two conductive rods 8 are further mounted on the inner side wall of the extension socket shell 13;
the extension socket shell 13 is also internally provided with components such as a relay and the like for controlling the current circulation or interruption (not shown in the figure), the conductive rod 8 is electrically connected with other electronic components through a wire, and when the electric connecting piece 7 abuts against the conductive rod 8, the conductive groove 4 supplies power to the plug;
the straight plate 11 is made of a material with good thermal conductivity, such as metal plated with an insulating layer, a carbon composite material, and the like;
the bottom wall of the insulating plate 5 is rotatably provided with two blocking plates 10, a return spring 9 is connected between the two blocking plates 10, the inner bottom wall of the extension socket shell 13 is provided with a guide groove 12, the bottom end of each blocking plate 10 is hermetically and slidably connected with the guide groove 12, and the guide groove 12 and the two blocking plates 10 are positioned between the two straight plates 11;
the insulating plate 5, the two straight plates 11 and the side wall of the extension socket shell 13 jointly form a sealed cavity, and the sealed cavity is divided into three independent sealed spaces through the two barrier plates 10.
In this embodiment, an evaporation liquid is filled between each barrier plate 10 and the corresponding straight plate 11, a non-compressive fluid is filled between the two barrier plates 10, a boiling point of the evaporation liquid is between 40 ℃ and 50 ℃, and the non-compressive fluid may be distilled water, hydraulic oil, or the like.
The included angle between the planes of the two barrier plates 10 is an acute angle, the range of the acute angle is 15-30 degrees, the two barrier plates 10 are splayed, and when the insulating plate 5 moves downwards, the two barrier plates 10 respectively move towards two opposite directions.
The bottom of every baffler 10 all is equipped with the fillet, can make baffler 10 bottoms more mellow and full through setting up the fillet, guarantees that it can be in the same direction as smooth removal on guide way 12.
When the present embodiment is used, the evaporation liquid with a boiling point between 40 ℃ and 50 ℃ is filled between the barrier plates 10 and the corresponding straight plates 11, the non-compressive fluid, such as distilled water, hydraulic oil, etc., is filled between the two barrier plates 10, when no plug is inserted, the barrier plates 10 are only subjected to the pressure caused by the self-gravity of the insulating plate 5, the conductive groove 4, etc., because the two barrier plates 10 are in the shape of the Chinese character 'ba' (as shown in fig. 1), the return spring 9 is in a slight stretching state at this time, and the non-compressive fluid is filled in the telescopic sleeve 2, which is in an extending state;
when a plug is inserted, the metal sheet on the plug extends into the conductive groove 4, the insulating plate 5 moves downwards along with the metal sheet, on one hand, the barrier plates 10 are rotatably connected with the insulating plate 5, so that the included angle between the two barrier plates 10 is gradually reduced along with the rotation of the barrier plates 10 (the rotation direction of the barrier plates 10 is shown as the arrow in fig. 2), namely, the volume of the space between the barrier plates 10 and the straight plate 11 is reduced, and the contact area between the evaporated liquid and the straight plate 11 is increased; on the other hand, the volume of the space between the two barrier plates 10 is increased, and the non-compressible liquid in the telescopic sleeve 2 flows downwards through the communication port 6, so that the telescopic sleeve 2 is contracted into the round hole 3 (as shown in fig. 2);
when the plug is completely inserted, the insulating plate 5 stops moving, the electric connection piece 7 is connected with the corresponding conductive rod 8, the plug board supplies power to the plug through the conductive rod 8, the electric connection piece 7 and the conductive groove 4 (components such as a relay and the like are also arranged in the extension socket shell 13 and are used for controlling the circulation or interruption of current, the connection mode of the components is not shown in the drawing and belongs to the prior art and is not described herein), when the extension socket is overloaded or is in a short-circuit state, a large amount of heat can be generated at the connection part of the electric connection piece 7 and the conductive rod 8 and at the connection part of the conductive groove 4 and the metal sheet, and the heat is conducted into the evaporation liquid through the insulating plate 5 and the straight plate 11, so that the temperature of the evaporation;
the evaporating liquid can be changed into a gas state from a liquid state during rapid evaporation, so that the pressure between the barrier plate 10 and the straight plate 11 is increased, the barrier plate 10 is pushed to be close to each other under the pushing of pressure, non-compressive fluid is extruded into the telescopic sleeve 2, the plug can be ejected out when the telescopic sleeve 2 extends (as shown in figure 3), the electric connecting piece 7 is not contacted with the conducting rod 8 any more, the automatic power-off of the extension and insertion is realized, after the temperature is reduced, the gas-state evaporating liquid is condensed into the liquid state, the barrier plate 10 is reset under the action of the reset spring 9, and all the devices return to the initial positions accordingly.
Example 2
Referring to fig. 4 to 5, the present embodiment is different from embodiment 1 in that: two standing grooves 15 have been seted up to the interior symmetry of extension socket casing 13, and the position of two standing grooves 15 is corresponding with the position that corresponds conducting rod 8 respectively, and equal sealing installation has transparent plate 14 in every standing groove 15, through transparent plate 14, people can observe the colour or the state change of object in standing groove 15.
When this embodiment uses, contain the temperature sensing color-changing material in the standing groove 15, like thermal pigment, the powder etc. that discolours, after the temperature rises to the specified value, the temperature sensing color-changing material changes to another kind of colour from a colour, after the temperature drops to below the specified value, the initial colour of temperature sensing color-changing material recovery, when circuit overload or short circuit, the temperature transmission of conducting rod 8 department to temperature sensing color-changing material department, make its colour change, can remind people in time to extract the plug, seek the reason, so as to avoid components and parts in the circuit to receive irreversible damage.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The utility model provides an overheated self-powered-off extension socket, includes extension socket casing (13), its characterized in that, the symmetry is provided with two straight boards (11) on the interior diapire of extension socket casing (13), two go up common sealed slidable mounting on straight board (11) has insulation board (5), be equipped with telescope tube (2) and two electrically conductive groove (4) on insulation board (5), the bilateral symmetry welding of insulation board (5) has electric connection piece (7), and each electric connection piece (7) all is connected with corresponding electrically conductive groove (4) electricity, round hole (3) and two slot (1) have been seted up on the roof of extension socket casing (13), the position of round hole (3) is corresponding with the position of telescope tube (2), the position of each slot (1) all is corresponding with the position of corresponding electrically conductive groove (4), intercommunication mouth (6) have been seted up in the middle part of insulation board (5), the position of the communication port (6) corresponds to the position of the telescopic sleeve (2), and two conducting rods (8) are further mounted on the inner side wall of the extension socket shell (13);
rotate on the diapire of insulation board (5) and be provided with two bafflers (10), and be connected with reset spring (9) between two bafflers (10), be equipped with guide way (12) on the inner diapire of row's socket casing (13), and the bottom of every baffler (10) all links to each other with guide way (12) seal sliding, guide way (12) and two bafflers (10) all are located between two straight boards (11).
2. The self-power-off overheat power strip according to claim 1, wherein an evaporative liquid is filled between each barrier plate (10) and the corresponding straight plate (11), and a non-compressive fluid is filled between the two barrier plates (10).
3. An overheating self-power-off extension socket according to claim 1, wherein the included angle between the planes of the two blocking plates (10) is an acute angle, and the acute angle ranges from 15 degrees to 30 degrees.
4. An overheated self-power-off extension socket as claimed in claim 1, wherein the bottom end of each blocking plate (10) is rounded.
5. The overheating self-power-off extension socket as claimed in claim 1, wherein two placing grooves (15) are symmetrically formed in the extension socket housing (13), the positions of the two placing grooves (15) correspond to the positions of the corresponding conductive rods (8), and a transparent plate (14) is hermetically mounted in each placing groove (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010298338.5A CN111509495B (en) | 2020-04-16 | 2020-04-16 | Overheated self-outage formula row inserts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010298338.5A CN111509495B (en) | 2020-04-16 | 2020-04-16 | Overheated self-outage formula row inserts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111509495A true CN111509495A (en) | 2020-08-07 |
| CN111509495B CN111509495B (en) | 2021-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010298338.5A Expired - Fee Related CN111509495B (en) | 2020-04-16 | 2020-04-16 | Overheated self-outage formula row inserts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111509495B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112134086A (en) * | 2020-09-23 | 2020-12-25 | 徐硕 | Intelligent socket |
| CN113133275A (en) * | 2021-03-05 | 2021-07-16 | 方燕 | Electromechanical device overload protection system |
| CN113232531A (en) * | 2021-05-25 | 2021-08-10 | 义雪峰 | High new forms of energy car of security rifle that charges |
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| JP2010157465A (en) * | 2009-01-05 | 2010-07-15 | Audio Technica Corp | Power supply plug |
| CN109524857A (en) * | 2018-11-22 | 2019-03-26 | 胡健 | A kind of anti-thermal socket excessively automatically powered off |
| CN109659778A (en) * | 2018-12-13 | 2019-04-19 | 郝诗敏 | A kind of antioverloading time opening plug |
| CN208835390U (en) * | 2018-11-08 | 2019-05-07 | 浙江恩加智能科技有限公司 | A kind of overcurrent self-shield plug |
| CN110350372A (en) * | 2019-07-17 | 2019-10-18 | 杭州筱酷贸易有限公司 | A kind of electric power safety protection socket based on magnetic button |
| CN110380287A (en) * | 2019-07-18 | 2019-10-25 | 王超 | A kind of loose-proof socket |
| CN110504601A (en) * | 2019-08-22 | 2019-11-26 | 王超 | A kind of anti-short circuit safety socket of hot power |
| CN110729578A (en) * | 2019-10-12 | 2020-01-24 | 珠海凌达压缩机有限公司 | Binding post structure and electric appliance comprising same |
-
2020
- 2020-04-16 CN CN202010298338.5A patent/CN111509495B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010157465A (en) * | 2009-01-05 | 2010-07-15 | Audio Technica Corp | Power supply plug |
| CN208835390U (en) * | 2018-11-08 | 2019-05-07 | 浙江恩加智能科技有限公司 | A kind of overcurrent self-shield plug |
| CN109524857A (en) * | 2018-11-22 | 2019-03-26 | 胡健 | A kind of anti-thermal socket excessively automatically powered off |
| CN109659778A (en) * | 2018-12-13 | 2019-04-19 | 郝诗敏 | A kind of antioverloading time opening plug |
| CN110350372A (en) * | 2019-07-17 | 2019-10-18 | 杭州筱酷贸易有限公司 | A kind of electric power safety protection socket based on magnetic button |
| CN110380287A (en) * | 2019-07-18 | 2019-10-25 | 王超 | A kind of loose-proof socket |
| CN110504601A (en) * | 2019-08-22 | 2019-11-26 | 王超 | A kind of anti-short circuit safety socket of hot power |
| CN110729578A (en) * | 2019-10-12 | 2020-01-24 | 珠海凌达压缩机有限公司 | Binding post structure and electric appliance comprising same |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112134086A (en) * | 2020-09-23 | 2020-12-25 | 徐硕 | Intelligent socket |
| CN113133275A (en) * | 2021-03-05 | 2021-07-16 | 方燕 | Electromechanical device overload protection system |
| CN113232531A (en) * | 2021-05-25 | 2021-08-10 | 义雪峰 | High new forms of energy car of security rifle that charges |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111509495B (en) | 2021-04-27 |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Hao Ti Inventor after: Qin Hongkun Inventor after: Li Yufeng Inventor before: Li Yufeng |
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| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210407 Address after: 154002 no.258 Xuefu street, Xiangyang District, Jiamusi City, Heilongjiang Province Applicant after: JIAMUSI University Address before: Hebei Xinhe Electric Power Construction Group Co., Ltd., 125 Xinxing street, Congtai District, Handan City, Hebei Province Applicant before: Li Yufeng |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210427 |