CN213980011U - Building site safety barrier monitoring and alarm system - Google Patents
Building site safety barrier monitoring and alarm system Download PDFInfo
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- CN213980011U CN213980011U CN202022862233.6U CN202022862233U CN213980011U CN 213980011 U CN213980011 U CN 213980011U CN 202022862233 U CN202022862233 U CN 202022862233U CN 213980011 U CN213980011 U CN 213980011U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 85
- 230000004888 barrier function Effects 0.000 title claims abstract description 74
- 238000009434 installation Methods 0.000 claims abstract description 22
- 230000001939 inductive effect Effects 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 21
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 11
- 229910052744 lithium Inorganic materials 0.000 claims description 11
- 230000002159 abnormal effect Effects 0.000 description 17
- 238000010276 construction Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 239000000872 buffer Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003086 colorant Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000009435 building construction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The utility model discloses a building site safety barrier monitoring and alarm system, including administrator PC end (1), data relay module (2) and guardrail monitoring module (3), administrator PC end (1) passes through cable junction with data relay module (2), and data relay module (2) pass through the wireless network with guardrail monitoring module (3) and are connected, guardrail monitoring module (3) are a plurality of, and every guardrail monitoring module (3) is installed respectively on safety barrier (5) that need monitor, guardrail monitoring module (3) one end is fixed in the installation department of safety barrier (5), and position inductive switch (3-1) of the guardrail monitoring module (3) other end is pushed down by safety barrier (5).
Description
Technical Field
The utility model belongs to the technical field of the building safety control, concretely relates to building site safety barrier monitoring and alarm system.
Background
The construction site is a place with high danger, the safety guardrail of the construction site is a guardrail arranged in a specific area or a high-rise building body in the construction site, is an important facility in construction safety management, and mainly aims to prevent constructors or articles from entering the dangerous specific area and falling or falling from a high-rise foundation pit, so that the safety protection effect is realized on the constructors or the articles. At present, safety barriers are generally net-shaped or railings, expansion bolts are arranged on the ground, vertical pipes are arranged, protective net sheets are welded, or transverse rods are fixed through buckles. General building construction time is short and one or two years, long and several years, the safety barrier is affected by external environment and personnel, so that the phenomena of corrosion, loosening or falling of fastening parts and damage or loss of parts often occur, even individual construction personnel remove the safety barrier privately for convenience of action, and great potential safety hazards are caused, and daily safety management of a building site mostly adopts methods of regularly patrolling, matching and monitoring by a safety worker, and the like. In fact, because the safety barrier places related to the construction site are very many, the work tasks of safety workers are heavy, the number of people is limited, and the safety barrier can not be inspected all the time and all the regions in daily inspection. Although the monitoring mode covers a large area, the hidden dangers such as fastening, loosening and damage of the safety guardrail and the like cannot be found in time, the guardrail can be removed by constructors privately, the installed actions violating the construction safety management are carried out afterwards, and the actions of the constructors and the monitoring cannot be found in time on the spot. The method of patrol or video monitoring by a security guard has the defects of large patrol workload, time and labor consumption, untimely abnormal state discovery, difficulty in tracking responsibility and the like. Therefore, the timely discovery and treatment of the abnormity of the safety barrier state are difficult points of daily safety management of a construction site, and no effective measure for monitoring and alarming the safety barrier in real time exists in the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art not enough, provide a building site safety barrier monitoring and alarm system, overcome the problem that exists among the prior art.
In order to solve the technical problem, the technical scheme of the utility model is that: the utility model provides a building site safety barrier monitoring and alarm system, includes administrator PC end, data relay module, guardrail monitoring module and safety barrier, administrator PC end passes through cable junction with data relay module, and data relay module passes through the wireless network with guardrail monitoring module and is connected, guardrail monitoring module is a plurality of, and every guardrail monitoring module is installed respectively on the safety barrier that needs the monitoring, guardrail monitoring module one end is fixed in safety barrier's installation department, and the position inductive switch of the guardrail monitoring module other end is pushed down by safety barrier.
Preferably, guardrail monitoring module still includes switch, work pilot lamp, signal transmission antenna, guardrail detection shell, control assembly and lithium cell, and wherein control assembly and lithium cell set up inside the guardrail detection shell, switch, work pilot lamp and position inductive switch set up terminal surface before the guardrail detection shell, and signal transmission antenna sets up in guardrail detection shell up end, control assembly is connected with lithium cell, position inductive switch, work pilot lamp and signal transmission antenna electricity respectively.
Preferably, the guardrail detects the shell and is the square shell, and wherein guardrail detects the shell rear end face and is provided with installation ribbon or fixing bolt, installation ribbon or fixing bolt are used for detecting the installation department that the shell was fixed in safety barrier with the guardrail.
Preferably, the position sensing switch is fixed on the front end face of the guardrail detection shell through a built-in spring, the position sensing switch is of a long strip-shaped structure, the straight line of the length direction of the position sensing switch is perpendicular to the straight line of the height direction of the safety guardrail, and the sensing stroke of the position sensing switch is 0.5-1 cm.
Preferably, the control component is a 51-chip microcomputer, the signal transmitting antenna transmits the state of the safety barrier to the data relay module in real time, and the transmitting frequency is not less than 10 Hz.
Preferably, the administrator PC terminal is connected to the data relay module through a USB serial cable.
Compared with the prior art, the utility model has the advantages of:
(1) the utility model provides a building site safety barrier monitoring and alarm system, can full-time section full-area monitoring safety barrier state through this system, in time discover fasten not hard up, the guardrail damage is lost or constructor maliciously demolishs the phenomenon such as, show on system administrator PC end and through audible alarm, supervise relevant personnel to the scene and in time investigate, eliminate the potential safety hazard, leave the record at system administrator PC end simultaneously, in order to be equipped with safety control personnel to examine, thereby reduce safety control personnel's work load, improve building site's safety control efficiency;
(2) the utility model comprises a manager PC end, a data relay module and a plurality of guardrail monitoring modules, wherein the guardrail monitoring modules are arranged at the safety guardrails, when a certain safety guardrail is loose in fastening, damaged or manually moved, a position induction switch of the guardrail monitoring modules is popped out, the safety guardrail can be detected to deviate from the original position, then a state signal is sent to the data relay module in a wireless mode, the data relay module is an information receiving and processing unit of the system and is responsible for receiving the guardrail states sent by all the guardrail monitoring modules, after conversion processing, the summarized data is sent to the manager PC end through a serial port, the manager PC end is recorded with all the guardrail detecting module positions of a building site in advance, and the system can display and send out sound to alarm by marking the positions with different colors for the abnormal safety guardrails, the safety management personnel can be reminded to pay attention, the safety management personnel can immediately search and process the reason of the abnormal state of the safety guardrail in time so as to eliminate potential safety hazards, and meanwhile, the system can also record the abnormal state of the safety guardrail into a system database for later inspection and follow up the responsibility of related personnel;
(3) the utility model discloses simple structure, reasonable in design, position inductive switch's response stroke is 0.5~1cm, can avoid natural environment such as wind-blowing to cause the safety barrier to slightly remove, avoids the wrong report to equipment cost is low, and the debugging is convenient, can in time discover safety barrier abnormal state.
Drawings
FIG. 1 is a schematic structural view of a safety barrier monitoring and alarming system for a construction site of the present invention;
FIG. 2 is a working schematic diagram of a safety barrier monitoring and alarming system for a construction site of the present invention;
fig. 3 the utility model relates to a building site safety barrier monitoring and alarm system's guardrail monitoring module structure schematic diagram.
Description of reference numerals:
1. the system comprises an administrator PC terminal 2, a data relay module 3, a guardrail monitoring module 4, a USB serial cable 5, a safety guardrail 6 and an installation ribbon;
3-1 parts of a position sensing switch, 3-2 parts of a power switch, 3-3 parts of a work indicator lamp, 3-4 parts of a signal transmitting antenna, 3-5 parts of a guardrail detection shell.
Detailed Description
The following description of the embodiments of the present invention is provided in connection with the following embodiments:
it should be noted that the structures, ratios, sizes, etc. illustrated in the present specification are only used to cooperate with the contents disclosed in the specification for the understanding and reading of the people skilled in the art, and are not used to limit the limit conditions that the present invention can be implemented, and any modifications of the structures, changes of the ratio relationships or adjustments of the sizes should still fall within the scope that the technical contents disclosed in the present invention can cover without affecting the functions and the achievable purposes of the present invention.
Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
Example 1
As shown in FIG. 1, the utility model discloses a building site safety barrier monitoring and alarm system, including administrator PC end 1, data relay module 2, guardrail monitoring module 3 and safety barrier 5, administrator PC end 1 passes through cable junction with data relay module 2, and data relay module 2 passes through the wireless network with guardrail monitoring module 3 and is connected, guardrail monitoring module 3 is a plurality of, and every guardrail monitoring module 3 is installed respectively on the safety barrier 5 that needs the monitoring, 3 one ends of guardrail monitoring module are fixed in safety barrier 5's installation department, and position inductive switch 3-1 of the 3 other ends of guardrail monitoring module is pushed down by safety barrier 5.
The data relay module 2 is an information receiving and processing unit of the system and is responsible for receiving the states of the guardrails sent by all the guardrail monitoring modules 3, and after conversion processing, the data relay module sends the summarized data to the administrator PC terminal 1 through a serial port.
The installation position of the safety barrier is an installation upright post, a wall and the like.
Example 2
As shown in fig. 3, preferably, the guardrail monitoring module 3 further includes a power switch 3-2, a work indicator lamp 3-3, a signal transmitting antenna 3-4, a guardrail detection shell 3-5, a control component and a lithium battery, wherein the control component and the lithium battery are disposed inside the guardrail detection shell 3-5, the power switch 3-2, the work indicator lamp 3-3 and the position sensing switch 3-1 are disposed on a front end face of the guardrail detection shell 3-5, the signal transmitting antenna 3-4 is disposed on an upper end face of the guardrail detection shell 3-5, and the control component is electrically connected with the lithium battery, the position sensing switch 3-1, the power switch 3-2, the work indicator lamp 3-3 and the signal transmitting antenna 3-4, respectively.
The power switch 3-2 and the working indicator lamp 3-3 are arranged on the left side of the front end face of the guardrail detection shell 3-5, the power switch 3-2 is arranged on the upper side of the working indicator lamp 3-3, and the position sensing switch 3-1 is arranged on the right side of the front end face of the guardrail detection shell 3-5.
Example 3
As shown in FIG. 3, preferably, the guardrail detecting shell 3-5 is a square shell, wherein the rear end face of the guardrail detecting shell 3-5 is provided with a mounting tie 6 or a fixing bolt, and the mounting tie 6 or the fixing bolt is used for fixing the guardrail detecting shell 3-5 at the mounting position of the safety guardrail 5.
The installation tie 6 or the fixing bolt is used for fixing one end of the guardrail detection shell 3-5 without the position sensing switch 3-1 on an installation upright post or a wall of the safety guardrail 5.
Example 4
As shown in fig. 3, the position sensing switch 3-1 is fixed on the front end face of the guardrail detection shell 3-5 through a built-in spring, wherein the position sensing switch 3-1 is in a strip-shaped structure, a straight line in the length direction of the position sensing switch 3-1 is perpendicular to a straight line in the height direction of the safety guardrail 5, and the sensing stroke of the position sensing switch 3-1 is 0.5-1 cm.
The position sensitive switch 3-1 is depressed by the safety barrier 5 and the position sensitive switch 3-1 pops up when the safety barrier 5 is removed.
The position sensing switch 3-1 has a sensing stroke of 0.5-1 cm, and when the safety barrier 5 moves to a position greater than 0.5cm, the barrier monitoring module 3 sends a signal of the movement of the safety barrier 5 to the data relay module 2, so that slight movement of the safety barrier caused by natural environments such as wind blowing and the like is avoided, and false alarm is generated.
Example 5
Preferably, the control component is a 51-singlechip, the signal transmitting antennas 3 to 4 transmit the state of the safety barrier 5 to the data relay module 2 in real time, and the transmitting frequency is not less than 10 Hz.
As shown in fig. 1, the administrator PC terminal 1 and the data relay module 2 are preferably connected by a USB serial cable 4.
The working principle of the utility model is as follows:
as shown in figure 1, the utility model relates to a building site safety barrier monitoring and alarm system, which comprises an administrator PC end 1, a data relay module 2 and a plurality of guard bar monitoring modules 3, wherein the administrator PC end 1 and the data relay module 2 are connected by a USB serial cable 4 and are arranged in a safety monitoring room, the guard bar monitoring modules 3 are arranged at the installation position of a safety guard bar 5 to be monitored, the safety guard bar 5 is pressed down a position induction switch 3-1, when the safety guard bar 5 is loosened or moved, the guard bar monitoring modules 3 can detect the change, the abnormal state of the guard bar is transmitted to the data relay module 2 by a signal transmitting antenna 3-4, the data relay module 2 receives the real-time state of all the monitored safety guard bars 5 and then transmits the result to the administrator PC end 1 by the USB serial cable 4, the administrator PC end 1 displays the result on a screen in real time, when the safety barriers 5 are abnormal, the system can display the positions marked by different colors and give out sound to give an alarm so as to remind safety management personnel that the state of a certain safety barrier 5 is abnormal and needs to be processed in time.
As shown in figure 3, the guardrail monitoring module 3 is powered by a lithium battery, when in installation, the guardrail monitoring module 3 is fixed with the installation column of the safety guardrail 5 by using the installation ribbon 6 or the fixing bolt, so that one side with the installation ribbon 6 is tightly attached to the installation column of the safety guardrail 5, the other side of the guardrail monitoring module 3 is tightly attached to the monitored safety guardrail 5, the position sensing switch 3-1 is pressed down by the safety guardrail 5, then the power switch 3-2 is turned on, the working indicator lamp 3-3 is lightened to indicate that the module is normally started, and at this moment, the guardrail monitoring module 3 is in a monitoring working state. When the safety barrier 5 is not moved, the position sensing switch 3-1 is pressed down by the safety barrier 5, which indicates that the state of the safety barrier 5 is normal; when the safety barrier 5 is loosened or manually moved, the position sensing switch 3-1 can be separated from the end face of the safety barrier 5, the position sensing switch 3-1 bounces to indicate that the state of the safety barrier 5 is abnormal, and the barrier monitoring module 3 can send the state of the safety barrier 5 to the data relay module 2 in real time through the signal transmitting antenna 3-4 at the frequency of not less than 10 Hz.
As shown in fig. 2, the utility model relates to a building site safety barrier monitoring and alarm system's working process as follows: the method comprises the steps that an administrator PC end 1 and a data relay module 2 are placed in a safety monitoring room and are connected through a USB serial cable 4, the administrator PC end 1 is powered by 220V mains supply, the data relay module 2 is powered by a USB serial port 5V, a guardrail monitoring module 3 is powered by a lithium battery and is installed on an installation upright post of a safety guardrail 5, a position sensing switch 3-1 is pressed down, after the system is powered on and started smoothly, when the safety guardrail 5 does not loosen or move, the position sensing switch 3-1 is pressed down, an I/O port corresponding to a 51 single chip microcomputer in the guardrail monitoring module 3 receives a high-level input signal, then the high-level input signal in the guardrail state is wirelessly sent to the data relay module 2 through a built-in wireless chip and a signal transmitting antenna 3-4, and the data relay module 2 is also internally provided with a wireless chip and a signal receiving antenna, the guardrail state high level signal sent by the guardrail monitoring module 3 is wirelessly received and written into the data buffer; when the safety guardrail 5 is loose in fastening, damaged or moved manually, the position sensing switch 3-1 bounces, an I/O port corresponding to a 51 single chip microcomputer in the guardrail monitoring module 3 receives a low-level input signal, then the guardrail state low-level signal is sent to the data relay module 2 through a built-in wireless chip and a signal transmitting antenna 3-4, and the data relay module 2 receives the low-level signal sent by the guardrail monitoring module 3 and writes the low-level signal into a data buffer. Similarly, the data relay module 2 receives the high and low level signals sent by all the guardrail monitoring modules 3 at the same time, and writes the signals into the data buffer according to a certain sequence and format, the status words in the data buffers represent the real-time status of all safety guardrails 5, then the data relay module 2 adopts a serial communication (USB) mode to send the status words of the safety guardrails 5 to the administrator PC terminal 1, the data relay module 2 sends the status words through the serial communication (USB), the administrator PC terminal 1 receives the status words through the serial communication (USB), the system software in the administrator PC terminal 1 records the position schematic diagrams of all the monitored safety guardrails 5 in advance, when the administrator PC terminal 1 receives the status word of the safety barrier 5, the status word is analyzed, when the value is "1", the state of the safety barrier 5 is considered to be normal, and the display screen is indicated by green; when the correspondence is '0', the state of the safety barrier is considered to be abnormal, the safety barrier 5 is shown to have the problems of loosening fastening, damage or artificial movement and the like, the number and the position of the safety barrier 5 with the problems are shown by red on a display screen, and sound is given out to remind safety management personnel to pay attention, and related personnel are urged to timely find the abnormal reason of the state of the safety barrier 5 on site and process and eliminate hidden dangers.
The utility model provides a building site safety barrier monitoring and alarm system, can full period total regional monitoring safety barrier state through this system, in time discover the fastening not hard up, the guardrail damage is lost or phenomenons such as constructor maliciously demolishs, show that serve at system administrator PC and pass through audible alarm, urge relevant personnel to in time investigate to the scene, eliminate the potential safety hazard, leave the record in system administrator PC end simultaneously, in order to be equipped with safety control personnel to examine, thereby reduce safety control personnel's work load, building site's safety management efficiency is improved.
The utility model comprises a manager PC end, a data relay module and a plurality of guardrail monitoring modules, wherein the guardrail monitoring modules are arranged at the safety guardrails, when a certain safety guardrail is loose in fastening, damaged or manually moved, a position induction switch of the guardrail monitoring modules is popped out, the safety guardrail can be detected to deviate from the original position, then a state signal is sent to the data relay module in a wireless mode, the data relay module is an information receiving and processing unit of the system and is responsible for receiving the guardrail states sent by all the guardrail monitoring modules, after conversion processing, the summarized data is sent to the manager PC end through a serial port, the manager PC end is recorded with all the guardrail detecting module positions of a building site in advance, and the system can display and send out sound to alarm by marking the positions with different colors for the abnormal safety guardrails, the safety management personnel can be reminded to pay attention to the safety management personnel, the safety management personnel can immediately search the reason of the abnormal state of the safety guardrail and process the abnormal state in time so as to eliminate potential safety hazards, and meanwhile, the system can also record the abnormal state of the safety guardrail into a system database so as to check the abnormal state later and investigate the responsibility of related personnel.
The utility model discloses simple structure, reasonable in design, position inductive switch's response stroke is 0.5~1cm, can avoid natural environment such as wind-blowing to cause the safety barrier to slightly remove, avoids the wrong report to equipment cost is low, and the debugging is convenient, can in time discover safety barrier abnormal state.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, and that the scope of the invention is defined by the appended claims.
Claims (6)
1. The utility model provides a building site safety barrier monitoring and alarm system which characterized in that: including administrator PC end (1), data relay module (2) and guardrail monitoring module (3), administrator PC end (1) passes through cable junction with data relay module (2), and data relay module (2) pass through the wireless network with guardrail monitoring module (3) and are connected, guardrail monitoring module (3) are a plurality of, and every guardrail monitoring module (3) is installed respectively on safety barrier (5) that need monitor, guardrail monitoring module (3) one end is fixed in the installation department of safety barrier (5), and position inductive switch (3-1) of guardrail monitoring module (3) other end is pushed down by safety barrier (5).
2. The building site safety barrier monitoring and warning system of claim 1, wherein: the guardrail monitoring module (3) also comprises a power switch (3-2), a working indicator lamp (3-3), a signal transmitting antenna (3-4), a guardrail detecting shell (3-5), a control component and a lithium battery, wherein the control component and the lithium battery are arranged inside the guardrail detection shell (3-5), the power switch (3-2), the work indicator lamp (3-3) and the position sensing switch (3-1) are arranged on the front end surface of the guardrail detection shell (3-5), the signal transmitting antenna (3-4) is arranged on the upper end surface of the guardrail detection shell (3-5), the control assembly is respectively and electrically connected with the lithium battery, the position sensing switch (3-1), the power switch (3-2), the work indicator lamp (3-3) and the signal transmitting antenna (3-4).
3. The building site safety barrier monitoring and warning system of claim 2, wherein: the guardrail detection shell (3-5) is a square shell, wherein an installation binding belt (6) or a fixing bolt is arranged on the rear end face of the guardrail detection shell (3-5), and the installation binding belt (6) or the fixing bolt is used for fixing the guardrail detection shell (3-5) at the installation position of the safety guardrail (5).
4. The building site safety barrier monitoring and warning system of claim 2, wherein: the position sensing switch (3-1) is fixed on the front end face of the guardrail detection shell (3-5) through a built-in spring, the position sensing switch (3-1) is of a long strip-shaped structure, a straight line in the length direction of the position sensing switch (3-1) is perpendicular to a straight line in the height direction of the safety guardrail (5), and the sensing stroke of the position sensing switch (3-1) is 0.5-1 cm.
5. The building site safety barrier monitoring and warning system of claim 2, wherein: the control component is a 51-single chip microcomputer, the signal transmitting antennas (3-4) transmit the state of the safety barrier (5) to the data relay module (2) in real time, and the transmitting frequency is not less than 10 Hz.
6. The building site safety barrier monitoring and warning system of claim 1, wherein: the administrator PC end (1) is connected with the data relay module (2) through a USB serial cable (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022862233.6U CN213980011U (en) | 2020-12-03 | 2020-12-03 | Building site safety barrier monitoring and alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022862233.6U CN213980011U (en) | 2020-12-03 | 2020-12-03 | Building site safety barrier monitoring and alarm system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213980011U true CN213980011U (en) | 2021-08-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022862233.6U Expired - Fee Related CN213980011U (en) | 2020-12-03 | 2020-12-03 | Building site safety barrier monitoring and alarm system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213980011U (en) |
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2020
- 2020-12-03 CN CN202022862233.6U patent/CN213980011U/en not_active Expired - Fee Related
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