CN220588778U - Charging pile circuit with automatic fire extinguishing function - Google Patents
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- CN220588778U CN220588778U CN202322205600.9U CN202322205600U CN220588778U CN 220588778 U CN220588778 U CN 220588778U CN 202322205600 U CN202322205600 U CN 202322205600U CN 220588778 U CN220588778 U CN 220588778U
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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Abstract
The utility model relates to the technical field of charging pile fire extinguishment and discloses a charging pile circuit with an automatic fire extinguishment function. The technical problems that in the prior art, when emergency situations such as fire disaster and the like occur, personnel are required to be attended by a charging station, personnel quality of the emergency services and strain capacity to the emergency situations are checked by means of manpower discovery and rescue, and loss of property personnel is easy to cause are solved. The utility model is connected with 380v commercial power through a circuit breaker, the other end of the circuit breaker is connected with a power supply conversion module, the power supply conversion module is connected with a charging pile main control module, the input end of the charging pile main control module is connected with a flame detection module, a smoke detection module and a temperature and humidity acquisition module, and the output end of the charging pile main control module is connected with a display module, an alarm module and a fire extinguishing module. The intelligent monitoring system can intelligently monitor the equipment condition without personnel on duty, can realize audible and visual alarm after finding out faults, and automatically starts the fire extinguishing device to minimize loss.
Description
Technical Field
The utility model relates to the technical field of charging pile fire extinguishment, in particular to a charging pile circuit with an automatic fire extinguishment function.
Background
At present, along with the national carbon outlet neutralization targets, the new energy industry is developed at a high speed, the new energy automobile is in an outbreak period, the charging pile industry is beneficial to the industry, the demand is greatly increased, more and more charging stations are built, the power of the charging pile is larger and larger, the charging speed is faster and faster, the accidents of the charging pile and the electric automobile caused by fire disaster are more and more, most of the accidents caused by fire disaster can not be extinguished in time after the fire disaster occurs, great property loss is caused, adverse social influence is caused, great negative influence is brought to the development of the industry, and the development of the industry is unfavorable.
Chinese patent literature in the prior art: 202210227685.8 an intelligent automatic fire extinguishing device for charging piles, the front end of the charging piles is provided with a charging gun assembly, one side of the charging piles is provided with an anti-theft box, the inside of the charging piles is provided with a protection footstock, the protection footstock and the charging piles are of an integrated structure, the inside of the protection footstock is provided with a movable cavity, the movable cavity and the protection footstock are of an integrated structure, the inside of the movable cavity is provided with a movable plate, the upper side of the movable plate is provided with an electric push rod assembly, the lower end of the movable plate is provided with a fire extinguishing mechanism, the lower surface of the protection footstock is provided with a temperature sensing assembly, the inside of the anti-theft box is provided with a fire extinguishing tank, and the lower surface of the fire extinguishing tank is provided with a discharging pipe.
However, in the implementation process, the above scheme has at least the following technical problems: when emergency such as fire disaster occurs, people need to watch the charging station, and rescue personnel quality and strain capacity to emergency are examined and rescued by manpower, and property personnel loss is easily caused. Therefore, it is highly desirable to provide a charging pile circuit with an automatic fire extinguishing function.
Disclosure of Invention
In view of the above technical problems, the present disclosure provides a charging pile circuit with an automatic fire extinguishing function, which solves the technical problems in the prior art that when a charging station needs personnel to watch and fire disaster and other emergency conditions, personnel quality and strain capacity to emergency conditions are examined and rescued by relying on manpower, and property personnel loss is easily caused.
According to one aspect of the present disclosure, a charging pile circuit with an automatic fire extinguishing function is provided, 380v commercial power is connected through a circuit breaker, the other end of the circuit breaker is connected with a power conversion module, the power conversion module is connected with a charging pile main control module, the input end of the charging pile main control module is connected with a flame detection module, a smoke detection module and a temperature and humidity acquisition module, and the output end of the charging pile main control module is connected with a charging pile internal power switch, a display module, an alarm module and a fire extinguishing module.
The input end of the charging pile main control module is also connected with a pressure detection module arranged below the fire extinguisher so as to detect the weight of the fire extinguisher in real time, the pressure detection module comprises a bridge type sensor and an HX711 converter, and the bridge type sensor is connected with a channel A of the HX 711.
The charging pile main control module comprises an STM32 single-chip microcomputer, and the STM32 single-chip microcomputer is connected with a reset circuit, a downloading interface, a starting circuit, a crystal oscillator circuit and a filter circuit.
The flame detection module comprises a plurality of flame sensors which are arranged in the charging pile at intervals, the flame sensors are connected with a sensitivity adjusting potentiometer in parallel, and the output end of each flame sensor is connected with the charging pile main control module through an LM393 comparator so as to output a switching signal.
The smoke detection module comprises a plurality of MQ-2 smoke sensors which are arranged in the charging pile at intervals, and output pins of the MQ-2 smoke sensors are connected with the comparator/AD converter.
The temperature and humidity acquisition module comprises a plurality of DHT11 digital temperature and humidity sensors which are distributed in the charging pile at intervals, and the DHT11 digital temperature and humidity sensors comprise a resistance type humidity sensing element and an NTC temperature measuring element.
The display module comprises an HMI USART serial port screen, wherein a TX pin of the HMI USART serial port screen is connected with a PA9 pin of the STM32 singlechip, and an RX pin of the HMI USART serial port screen is connected with a PA10 pin of the STM32 singlechip.
The alarm module comprises a buzzer, and the buzzer is connected with a PB5 port of the STM32 singlechip through a resistor connected in series with a triode base electrode.
The fire extinguishing module comprises a relay, the input end of the relay is connected with the PA11 port of the STM32 singlechip, and the output end of the relay is connected with a water pump.
The utility model has the beneficial effects that:
the intelligent monitoring system can intelligently monitor the equipment condition without personnel on duty, can realize audible and visual alarm after finding out faults, and automatically starts the fire extinguishing device to minimize loss.
The pressure detection module detects the weight of the fire extinguisher in real time, prevents that the fire extinguisher from causing the atmospheric pressure to be insufficient because of reasons such as gas leakage or ageing, reminds security personnel to change the fire extinguisher in time.
The A/D converter has the advantages of high integration level, high response speed, strong anti-interference performance and the like, reduces input cost and improves the overall performance and reliability.
And a special digital module acquisition technology and a temperature and humidity sensing technology are applied to ensure that the product has extremely high reliability and excellent long-term stability.
The flame sensor timely judges the occurrence direction of the fire, and then starts to extinguish the fire in the fire direction. The flame sensor is very sensitive to the optical signal with specific wavelength, and the sensitivity of the flame sensor can be adjusted by adjusting the adjustable resistor through the parallel sensitivity adjusting potentiometer, so that the flame sensor can more accurately detect the flame.
MQ-2 is arranged to detect liquefied gas, benzene, alkane, alcohol, hydrogen, smoke and the like. The detection range of MQ-2 is extremely broad. The sensor has the advantages of high sensitivity, quick response, good stability, long service life and simple driving circuit.
The serial port screen is arranged, so that the operation of displaying and sending the threshold value can be realized, and convenience is brought to people. The device not only can display the current temperature and humidity and the set concentration threshold voltage, but also can set the threshold value through the serial screen, thereby changing the voltage corresponding to different concentrations and realizing the function of fire extinguishment.
Drawings
FIG. 1 is a block diagram of a charging pile circuit with automatic fire extinguishing function;
FIG. 2 is a schematic circuit diagram of a pressure detection module;
fig. 3 is a schematic circuit diagram of a charging pile main control module;
FIG. 4 is a schematic circuit diagram of a flame detection module;
FIG. 5 is a schematic circuit diagram of a smoke detection module;
FIG. 6 is a schematic circuit diagram of a temperature and humidity acquisition module;
FIG. 7 is a schematic diagram of an alarm module circuit;
FIG. 8 is a schematic circuit diagram of a fire suppression module;
FIG. 9 is a schematic circuit diagram of a smoke detection module according to example 2;
Detailed Description
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
Example 1
The embodiment discloses a charging pile circuit with an automatic fire extinguishing function, which is shown in figures 1 to 9,
the electric pile is characterized in that the electric pile is connected with 380v commercial power through a circuit breaker, the other end of the circuit breaker is connected with a power conversion module, the power conversion module is connected with a charging pile main control module, the input end of the charging pile main control module is connected with a flame detection module, a smoke detection module and a temperature and humidity acquisition module, and the output end of the charging pile main control module is connected with an internal power switch, a display module, an alarm module and a fire extinguishing module of the charging pile.
The charging pile main control module detects smoke alarm signals and temperature signals in real time at the same time; when detecting that the smoke alarm signal and/or the temperature signal reach an alarm value; if the charging pile is in the working state at this time, the charging pile is stopped, the alarm gives out an audible and visual alarm, and if the charging pile is in the standby state at this time, the charging pile alarm gives out an audible and visual alarm.
If the charging pile is in a power failure state when the charging pile fails, the controller does not work, a worker can emergently extinguish the fire by using the button, and the fire extinguishing device is started.
The input end of the charging pile main control module is also connected with a pressure detection module arranged below the fire extinguisher so as to detect the weight of the fire extinguisher in real time, and the pressure detection module comprises a bridge type sensor and an HX711 converter, wherein the bridge type sensor is connected with a channel A of the HX 711.
The pressure detection module is placed below the fire extinguisher, the weight of the fire extinguisher can be detected in real time, if the fire extinguisher is insufficient in air pressure due to air leakage or aging and the like, the weight of the fire extinguisher is reduced, the pressure sensor module is provided with a threshold value, when the measured data of the pressure sensor module is smaller than the threshold value, the air pressure of the fire extinguisher can be judged to be insufficient, the information is transmitted to the singlechip, and the singlechip controls the buzzer to send out warning sounds to remind security personnel to replace the fire extinguisher in time.
HX711 is a 24-bit a/D converter chip. The chip is integrated with a stabilized voltage supply and an on-chip clock oscillator, and an input selection switch can select a channel A or a channel B and is connected with a low-noise programmable amplifier in the chip. The programmable gain of channel A is 128 or 64, and the corresponding full scale differential input signal amplitude is 20mV or 40mV, respectively. Channel B is then a fixed 32 gain for system parameter detection. The regulated power supply provided in the chip can directly supply power to the external sensor and the A/D converter in the chip. The serial communication line is composed of pins PD_SCK and DOUT, and is used for outputting data, selecting an input channel and a gain. When the data output pin DOUT is high, it indicates that the a/D converter is not ready to output data, and the serial clock input signal pd_sck is low. When DOUT goes from high to low, pd_sck inputs 25 to 27 unequal clock pulses. Wherein the rising edge of the first clock pulse will read out the Most Significant Bit (MSB) of the 24-bit output data until the 24-th clock pulse is completed, and the 24-bit output data is completed from the most significant bit to the least significant bit. The 25 th to 27 th clock pulses are used to select the input channel and gain of the next a/D conversion. The number of input clock pulses of the PD_SCK is not less than 25 or more than 27, otherwise serial communication errors are caused. The a/D converter requires 4 data output cycles to stabilize when the input channel or gain of the a/D converter changes. DOUT will go from high to low after 4 data output cycles to output valid data. When the chip is powered on, a power-on automatic reset circuit in the chip can automatically reset the chip. Pin pd_sck input is used to control the power down of HX 711. When PD_SCK is low level, the chip is in normal working state. HX711 enters the power down state if pd_sck goes from low to high and remains high for more than 60 mus. If an on-chip regulated power supply circuit is used, the external sensor and the on-chip A/D converter are powered off simultaneously when the power is off. When the PD_SCK returns to the low level again, the chip can automatically reset and then enter a normal working state. After the chip enters a normal operating state from a reset or power-off state, channel a and gain 128 are automatically selected as the input channels and gains for the first a/D conversion. The subsequent input channel and gain selection is determined by the number of pulses of pd_sck. After the chip enters a normal working state from a reset state or a power-off state, the A/D converter needs 4 data output periods to be stable. DOUT will go from high to low after 4 data output cycles to output valid data.
The charging pile main control module comprises an STM32 singlechip, and the STM32 singlechip is connected with a reset circuit, a downloading interface, a starting circuit, a crystal oscillator circuit and a filter circuit.
The flame detection module comprises a plurality of flame sensors which are arranged in the charging pile at intervals, the flame sensors are connected with the sensitivity adjusting potentiometer in parallel, and the output ends of the flame sensors are connected with the charging pile main control module through the LM393 comparator so as to output switching signals.
The flame sensor can judge the occurrence direction of the fire in time, and then fire extinguishing is started towards the direction of the fire. The flame sensor is very sensitive to the optical signal with specific wavelength, and the sensitivity of the flame sensor can be adjusted by adjusting the adjustable resistor, so that the flame sensor can detect the flame more accurately and is not interfered by other light sources. If flame is detected, the IO port of the flame sensor outputs a high level, the singlechip judges whether flame is detected, and after flame is detected, the buzzer sounds.
The smoke detection module comprises a plurality of MQ-2 smoke sensors which are arranged in the charging pile at intervals, and output pins of the MQ-2 smoke sensors are connected with the AD converter.
The fire disaster with larger or smaller fire disaster is accompanied with a certain smoke, the MQ-2 smoke sensor can sensitively detect the change of components in the surrounding smoke, detect the content of harmful gases in the air, and when the content exceeds a set threshold value, indicate that the fire disaster possibly occurs, send fire disaster information to the singlechip, judge and process the fire disaster information and then send an alarm signal.
The MQ-2 smoke sensor is connected with an AD converter, and the AD converter converts the voltage signal into a digital signal and further into an accurate smoke concentration value. The voltages of the 4 feet and the 6 feet of the MQ-2 sensor are output signals, and Rs is the body resistance of the sensor. Wherein if the gas concentration increases, rs decreases. While a decrease in Rs results in an increase in the voltage of the 4-pin, 6-pin output of MQ-2 to ground. The gas concentration increases and the voltage at its output increases, eventually increasing in value after conversion by ADC 0804. The acquisition of the smoke concentration of the MQ-2 is realized, and the acquisition of signals can be completed only by realizing an ADC0804 acquisition function. However, the signal collected by ADC0804 is only the original signal, and is converted into the actual smoke concentration, and correction and formula conversion are also required according to the characteristics of MQ-2, so as to obtain the actual concentration value.
The temperature and humidity acquisition module comprises a plurality of DHT11 digital temperature and humidity sensors which are arranged in the charging pile at intervals, and the DHT11 digital temperature and humidity sensors comprise a resistance type humidity sensing element and an NTC temperature measuring element.
The DHT11 digital temperature and humidity sensor jointly determines whether a fire condition exists or not through humidity and temperature, and the DHT11 measured temperature can be fed back to a water pump to spray water for the environment for cooling and humidifying. The DHT11 digital wet temperature sensor adopts a single bus data format. I.e. a single data port completes the input-output bi-directional transmission. The data packet consists of 5 bytes (40 bits). The data is divided into a fractional part and an integer part. The format is described as follows:
one complete data transmission is 40bit, high-order first-out. 8bit humidity integer data+8 bit humidity decimal data+8 bit temperature integer data+8 bit temperature decimal data=8 bit checksum
Humidity = byte4.Byte3 = 45.0 (% RH)
Temperature=byte2.byte1=28.0 (°c)
Check data=byte 4+byte3+byte2+byte 1=73 (humidity+temperature)
The maximum communication time of the DHT11 is 3ms, and the continuous sampling interval of the host is not less than 100ms.
After the host transmits a start signal, the host waits for 20us to 40us and reads the response signal of the DHT11, reads the bus to be at a low level, indicates that the DHT11 transmits a response signal, pulls the bus high after the DHT11 transmits the response signal, and prepares to transmit data, and each bit of data is started at a low level.
And an LED lamp is connected between VCC and GND and is used as a power-on indicator lamp.
The display module comprises an HMI USART serial port screen, wherein a TX pin of the HMI USART serial port screen is connected with a PA9 pin of the STM32 singlechip, and an RX pin of the HMI USART serial port screen is connected with a PA10 pin of the STM32 singlechip.
The resources on the HMI USART serial port screen board are used as USART3 and UART1, the USART3 is connected with the serial port screen, and the UART1 is connected with a computer.
The alarm module comprises a buzzer, and the buzzer is connected with a PB5 port of the STM32 singlechip through a resistor connected in series with a triode base electrode.
The fire extinguishing module comprises a relay, the input end of the relay is connected with the PA11 port of the STM32 singlechip, and the output end of the relay is connected with the water pump.
When the return value of the smoke sensor is larger than the set threshold value, the pins PB5 and PA11 are enabled to be low level by the singlechip, so that alarm of the buzzer is realized, the relay is opened, the 12V line of the water pump and the 12V power supply are conducted, water pumping and fire extinguishing are realized, when the current value is lowered to be lower than the threshold value, the high level is given to the singlechip PB5 and PA11, and therefore the alarm and water storage work is stopped.
Example 2
The smoke detection module comprises a plurality of MQ-2 smoke sensors which are arranged in the charging pile at intervals, and output pins of the MQ-2 smoke sensors are connected with the comparator.
The 4 pin of MQ-2 outputs a direct current signal that varies with smoke concentration, which is applied to the 2 pin of comparator U1A, rp constituting the threshold voltage of the comparator. When the smoke concentration is higher and the output voltage is higher than the threshold voltage, the comparator outputs a low level (0 v), and the LED is on for alarming; when the output voltage of the concentration-decrease sensor is lower than the threshold voltage, the comparator toggles to output a high level (Vcc) and the LED goes off. Adjusting Rp can adjust the threshold voltage of the comparator and thus the sensitivity of the alert output.
R1 is connected in series with a heating loop of the sensor, so that the heating wire can be protected from impact during cold power-on.
The detection signal processed by the comparator circuit has only two states of high and low; when the concentration is below the threshold, the signal is high; when the concentration is above the threshold, the signal is low. Therefore, the singlechip pin is only required to be configured into an input mode, and the high and low levels of the signal are monitored.
While certain preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, the present utility model is intended to include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. Fill electric pile circuit that possesses automatic fire extinguishing function, connect 380v commercial power, its characterized in that through the circuit breaker: the circuit breaker is characterized in that the other end of the circuit breaker is connected with a power supply conversion module, the power supply conversion module is connected with a charging pile main control module, the input end of the charging pile main control module is connected with a flame detection module, a smoke detection module and a temperature and humidity acquisition module, and the output end of the charging pile main control module is connected with a charging pile internal power supply switch, a display module, an alarm module and a fire extinguishing module; the input end of the charging pile main control module is also connected with a pressure detection module arranged below the fire extinguisher so as to detect the weight of the fire extinguisher in real time; the charging pile main control module comprises an STM32 single-chip microcomputer, and the STM32 single-chip microcomputer is connected with a reset circuit, a downloading interface, a starting circuit, a crystal oscillator circuit and a filter circuit.
2. The charging pile circuit with automatic fire extinguishing function according to claim 1, wherein: the pressure detection module comprises a bridge sensor and an HX711 converter, wherein the bridge sensor is connected with a channel A of the HX 711.
3. The charging pile circuit with automatic fire extinguishing function according to claim 1, wherein: the flame detection module comprises a plurality of flame sensors which are arranged in the charging pile at intervals, the flame sensors are connected with a sensitivity adjusting potentiometer in parallel, and the output end of each flame sensor is connected with the charging pile main control module through an LM393 comparator so as to output a switching signal.
4. The charging pile circuit with automatic fire extinguishing function according to claim 1, wherein: the smoke detection module comprises a plurality of MQ-2 smoke sensors which are arranged in the charging pile at intervals, and output pins of the MQ-2 smoke sensors are connected with the comparator/AD converter.
5. The charging pile circuit with automatic fire extinguishing function according to claim 1, wherein: the temperature and humidity acquisition module comprises a plurality of DHT11 digital temperature and humidity sensors which are distributed in the charging pile at intervals, and the DHT11 digital temperature and humidity sensors comprise a resistance type humidity sensing element and an NTC temperature measuring element.
6. The charging pile circuit with automatic fire extinguishing function according to claim 1, wherein: the display module comprises an HMI USART serial port screen, wherein a TX pin of the HMI USART serial port screen is connected with a PA9 pin of the STM32 singlechip, and an RX pin of the HMI USART serial port screen is connected with a PA10 pin of the STM32 singlechip.
7. The charging pile circuit with automatic fire extinguishing function according to claim 1, wherein: the alarm module comprises a buzzer, and the buzzer is connected with a PB5 port of the STM32 singlechip through a resistor connected in series with a triode base electrode.
8. The charging pile circuit with automatic fire extinguishing function according to claim 1, wherein: the fire extinguishing module comprises a relay, the input end of the relay is connected with the PA11 port of the STM32 singlechip, and the output end of the relay is connected with a water pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322205600.9U CN220588778U (en) | 2023-08-16 | 2023-08-16 | Charging pile circuit with automatic fire extinguishing function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322205600.9U CN220588778U (en) | 2023-08-16 | 2023-08-16 | Charging pile circuit with automatic fire extinguishing function |
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| Publication Number | Publication Date |
|---|---|
| CN220588778U true CN220588778U (en) | 2024-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322205600.9U Active CN220588778U (en) | 2023-08-16 | 2023-08-16 | Charging pile circuit with automatic fire extinguishing function |
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| Country | Link |
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| CN (1) | CN220588778U (en) |
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2023
- 2023-08-16 CN CN202322205600.9U patent/CN220588778U/en active Active
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